arch/x86/kvm/vmx.c

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * This module enables machines with Intel VT-x extensions to run virtual
   5  * machines without emulation or binary translation.
   6  *
   7  * Copyright (C) 2006 Qumranet, Inc.
   8  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
   9  *
  10  * Authors:
  11  *   Avi Kivity   <avi@qumranet.com>
  12  *   Yaniv Kamay  <yaniv@qumranet.com>
  13  *
  14  * This work is licensed under the terms of the GNU GPL, version 2.  See
  15  * the COPYING file in the top-level directory.
  16  *
  17  */
  18
  19 #include "irq.h"
  20 #include "mmu.h"
  21 #include "cpuid.h"
  22
  23 #include <linux/kvm_host.h>
  24 #include <linux/module.h>
  25 #include <linux/kernel.h>
  26 #include <linux/mm.h>
  27 #include <linux/highmem.h>
  28 #include <linux/sched.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/mod_devicetable.h>
  31 #include <linux/ftrace_event.h>
  32 #include <linux/slab.h>
  33 #include <linux/tboot.h>
  34 #include <linux/hrtimer.h>
  35 #include "kvm_cache_regs.h"
  36 #include "x86.h"
  37
  38 #include <asm/io.h>
  39 #include <asm/desc.h>
  40 #include <asm/vmx.h>
  41 #include <asm/virtext.h>
  42 #include <asm/mce.h>
  43 #include <asm/i387.h>
  44 #include <asm/xcr.h>
  45 #include <asm/perf_event.h>
  46 #include <asm/debugreg.h>
  47 #include <asm/kexec.h>
  48
  49 #include "trace.h"
  50
  51 #define __ex(x) __kvm_handle_fault_on_reboot(x)
  52 #define __ex_clear(x, reg) \
  53         ____kvm_handle_fault_on_reboot(x, "xor " reg " , " reg)
  54
  55 MODULE_AUTHOR("Qumranet");
  56 MODULE_LICENSE("GPL");
  57
  58 static const struct x86_cpu_id vmx_cpu_id[] = {
  59         X86_FEATURE_MATCH(X86_FEATURE_VMX),
  60         {}
  61 };
  62 MODULE_DEVICE_TABLE(x86cpu, vmx_cpu_id);
  63
  64 static bool __read_mostly enable_vpid = 1;
  65 module_param_named(vpid, enable_vpid, bool, 0444);
  66
  67 static bool __read_mostly flexpriority_enabled = 1;
  68 module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO);
  69
  70 static bool __read_mostly enable_ept = 1;
  71 module_param_named(ept, enable_ept, bool, S_IRUGO);
  72
  73 static bool __read_mostly enable_unrestricted_guest = 1;
  74 module_param_named(unrestricted_guest,
  75                         enable_unrestricted_guest, bool, S_IRUGO);
  76
  77 static bool __read_mostly enable_ept_ad_bits = 1;
  78 module_param_named(eptad, enable_ept_ad_bits, bool, S_IRUGO);
  79
  80 static bool __read_mostly emulate_invalid_guest_state = true;
  81 module_param(emulate_invalid_guest_state, bool, S_IRUGO);
  82
  83 static bool __read_mostly vmm_exclusive = 1;
  84 module_param(vmm_exclusive, bool, S_IRUGO);
  85
  86 static bool __read_mostly fasteoi = 1;
  87 module_param(fasteoi, bool, S_IRUGO);
  88
  89 static bool __read_mostly enable_apicv = 1;
  90 module_param(enable_apicv, bool, S_IRUGO);
  91
  92 static bool __read_mostly enable_shadow_vmcs = 1;
  93 module_param_named(enable_shadow_vmcs, enable_shadow_vmcs, bool, S_IRUGO);
  94 /*
  95  * If nested=1, nested virtualization is supported, i.e., guests may use
  96  * VMX and be a hypervisor for its own guests. If nested=0, guests may not
  97  * use VMX instructions.
  98  */
  99 static bool __read_mostly nested = 0;
 100 module_param(nested, bool, S_IRUGO);
 101
 102 #define KVM_GUEST_CR0_MASK (X86_CR0_NW | X86_CR0_CD)
 103 #define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST (X86_CR0_WP | X86_CR0_NE)
 104 #define KVM_VM_CR0_ALWAYS_ON                                            \
 105         (KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
 106 #define KVM_CR4_GUEST_OWNED_BITS                                      \
 107         (X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR      \
 108          | X86_CR4_OSXMMEXCPT)
 109
 110 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
 111 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
 112
 113 #define RMODE_GUEST_OWNED_EFLAGS_BITS (~(X86_EFLAGS_IOPL | X86_EFLAGS_VM))
 114
 115 #define VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE 5
 116
 117 /*
 118  * These 2 parameters are used to config the controls for Pause-Loop Exiting:
 119  * ple_gap:    upper bound on the amount of time between two successive
 120  *             executions of PAUSE in a loop. Also indicate if ple enabled.
 121  *             According to test, this time is usually smaller than 128 cycles.
 122  * ple_window: upper bound on the amount of time a guest is allowed to execute
 123  *             in a PAUSE loop. Tests indicate that most spinlocks are held for
 124  *             less than 2^12 cycles
 125  * Time is measured based on a counter that runs at the same rate as the TSC,
 126  * refer SDM volume 3b section 21.6.13 & 22.1.3.
 127  */
 128 #define KVM_VMX_DEFAULT_PLE_GAP           128
 129 #define KVM_VMX_DEFAULT_PLE_WINDOW        4096
 130 #define KVM_VMX_DEFAULT_PLE_WINDOW_GROW   2
 131 #define KVM_VMX_DEFAULT_PLE_WINDOW_SHRINK 0
 132 #define KVM_VMX_DEFAULT_PLE_WINDOW_MAX    \
 133                 INT_MAX / KVM_VMX_DEFAULT_PLE_WINDOW_GROW
 134
 135 static int ple_gap = KVM_VMX_DEFAULT_PLE_GAP;
 136 module_param(ple_gap, int, S_IRUGO);
 137
 138 static int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW;
 139 module_param(ple_window, int, S_IRUGO);
 140
 141 /* Default doubles per-vcpu window every exit. */
 142 static int ple_window_grow = KVM_VMX_DEFAULT_PLE_WINDOW_GROW;
 143 module_param(ple_window_grow, int, S_IRUGO);
 144
 145 /* Default resets per-vcpu window every exit to ple_window. */
 146 static int ple_window_shrink = KVM_VMX_DEFAULT_PLE_WINDOW_SHRINK;
 147 module_param(ple_window_shrink, int, S_IRUGO);
 148
 149 /* Default is to compute the maximum so we can never overflow. */
 150 static int ple_window_actual_max = KVM_VMX_DEFAULT_PLE_WINDOW_MAX;
 151 static int ple_window_max        = KVM_VMX_DEFAULT_PLE_WINDOW_MAX;
 152 module_param(ple_window_max, int, S_IRUGO);
 153
 154 extern const ulong vmx_return;
 155
 156 #define NR_AUTOLOAD_MSRS 8
 157 #define VMCS02_POOL_SIZE 1
 158
 159 struct vmcs {
 160         u32 revision_id;
 161         u32 abort;
 162         char data[0];
 163 };
 164
 165 /*
 166  * Track a VMCS that may be loaded on a certain CPU. If it is (cpu!=-1), also
 167  * remember whether it was VMLAUNCHed, and maintain a linked list of all VMCSs
 168  * loaded on this CPU (so we can clear them if the CPU goes down).
 169  */
 170 struct loaded_vmcs {
 171         struct vmcs *vmcs;
 172         int cpu;
 173         int launched;
 174         struct list_head loaded_vmcss_on_cpu_link;
 175 };
 176
 177 struct shared_msr_entry {
 178         unsigned index;
 179         u64 data;
 180         u64 mask;
 181 };
 182
 183 /*
 184  * struct vmcs12 describes the state that our guest hypervisor (L1) keeps for a
 185  * single nested guest (L2), hence the name vmcs12. Any VMX implementation has
 186  * a VMCS structure, and vmcs12 is our emulated VMX's VMCS. This structure is
 187  * stored in guest memory specified by VMPTRLD, but is opaque to the guest,
 188  * which must access it using VMREAD/VMWRITE/VMCLEAR instructions.
 189  * More than one of these structures may exist, if L1 runs multiple L2 guests.
 190  * nested_vmx_run() will use the data here to build a vmcs02: a VMCS for the
 191  * underlying hardware which will be used to run L2.
 192  * This structure is packed to ensure that its layout is identical across
 193  * machines (necessary for live migration).
 194  * If there are changes in this struct, VMCS12_REVISION must be changed.
 195  */
 196 typedef u64 natural_width;
 197 struct __packed vmcs12 {
 198         /* According to the Intel spec, a VMCS region must start with the
 199          * following two fields. Then follow implementation-specific data.
 200          */
 201         u32 revision_id;
 202         u32 abort;
 203
 204         u32 launch_state; /* set to 0 by VMCLEAR, to 1 by VMLAUNCH */
 205         u32 padding[7]; /* room for future expansion */
 206
 207         u64 io_bitmap_a;
 208         u64 io_bitmap_b;
 209         u64 msr_bitmap;
 210         u64 vm_exit_msr_store_addr;
 211         u64 vm_exit_msr_load_addr;
 212         u64 vm_entry_msr_load_addr;
 213         u64 tsc_offset;
 214         u64 virtual_apic_page_addr;
 215         u64 apic_access_addr;
 216         u64 ept_pointer;
 217         u64 guest_physical_address;
 218         u64 vmcs_link_pointer;
 219         u64 guest_ia32_debugctl;
 220         u64 guest_ia32_pat;
 221         u64 guest_ia32_efer;
 222         u64 guest_ia32_perf_global_ctrl;
 223         u64 guest_pdptr0;
 224         u64 guest_pdptr1;
 225         u64 guest_pdptr2;
 226         u64 guest_pdptr3;
 227         u64 guest_bndcfgs;
 228         u64 host_ia32_pat;
 229         u64 host_ia32_efer;
 230         u64 host_ia32_perf_global_ctrl;
 231         u64 padding64[8]; /* room for future expansion */
 232         /*
 233          * To allow migration of L1 (complete with its L2 guests) between
 234          * machines of different natural widths (32 or 64 bit), we cannot have
 235          * unsigned long fields with no explict size. We use u64 (aliased
 236          * natural_width) instead. Luckily, x86 is little-endian.
 237          */
 238         natural_width cr0_guest_host_mask;
 239         natural_width cr4_guest_host_mask;
 240         natural_width cr0_read_shadow;
 241         natural_width cr4_read_shadow;
 242         natural_width cr3_target_value0;
 243         natural_width cr3_target_value1;
 244         natural_width cr3_target_value2;
 245         natural_width cr3_target_value3;
 246         natural_width exit_qualification;
 247         natural_width guest_linear_address;
 248         natural_width guest_cr0;
 249         natural_width guest_cr3;
 250         natural_width guest_cr4;
 251         natural_width guest_es_base;
 252         natural_width guest_cs_base;
 253         natural_width guest_ss_base;
 254         natural_width guest_ds_base;
 255         natural_width guest_fs_base;
 256         natural_width guest_gs_base;
 257         natural_width guest_ldtr_base;
 258         natural_width guest_tr_base;
 259         natural_width guest_gdtr_base;
 260         natural_width guest_idtr_base;
 261         natural_width guest_dr7;
 262         natural_width guest_rsp;
 263         natural_width guest_rip;
 264         natural_width guest_rflags;
 265         natural_width guest_pending_dbg_exceptions;
 266         natural_width guest_sysenter_esp;
 267         natural_width guest_sysenter_eip;
 268         natural_width host_cr0;
 269         natural_width host_cr3;
 270         natural_width host_cr4;
 271         natural_width host_fs_base;
 272         natural_width host_gs_base;
 273         natural_width host_tr_base;
 274         natural_width host_gdtr_base;
 275         natural_width host_idtr_base;
 276         natural_width host_ia32_sysenter_esp;
 277         natural_width host_ia32_sysenter_eip;
 278         natural_width host_rsp;
 279         natural_width host_rip;
 280         natural_width paddingl[8]; /* room for future expansion */
 281         u32 pin_based_vm_exec_control;
 282         u32 cpu_based_vm_exec_control;
 283         u32 exception_bitmap;
 284         u32 page_fault_error_code_mask;
 285         u32 page_fault_error_code_match;
 286         u32 cr3_target_count;
 287         u32 vm_exit_controls;
 288         u32 vm_exit_msr_store_count;
 289         u32 vm_exit_msr_load_count;
 290         u32 vm_entry_controls;
 291         u32 vm_entry_msr_load_count;
 292         u32 vm_entry_intr_info_field;
 293         u32 vm_entry_exception_error_code;
 294         u32 vm_entry_instruction_len;
 295         u32 tpr_threshold;
 296         u32 secondary_vm_exec_control;
 297         u32 vm_instruction_error;
 298         u32 vm_exit_reason;
 299         u32 vm_exit_intr_info;
 300         u32 vm_exit_intr_error_code;
 301         u32 idt_vectoring_info_field;
 302         u32 idt_vectoring_error_code;
 303         u32 vm_exit_instruction_len;
 304         u32 vmx_instruction_info;
 305         u32 guest_es_limit;
 306         u32 guest_cs_limit;
 307         u32 guest_ss_limit;
 308         u32 guest_ds_limit;
 309         u32 guest_fs_limit;
 310         u32 guest_gs_limit;
 311         u32 guest_ldtr_limit;
 312         u32 guest_tr_limit;
 313         u32 guest_gdtr_limit;
 314         u32 guest_idtr_limit;
 315         u32 guest_es_ar_bytes;
 316         u32 guest_cs_ar_bytes;
 317         u32 guest_ss_ar_bytes;
 318         u32 guest_ds_ar_bytes;
 319         u32 guest_fs_ar_bytes;
 320         u32 guest_gs_ar_bytes;
 321         u32 guest_ldtr_ar_bytes;
 322         u32 guest_tr_ar_bytes;
 323         u32 guest_interruptibility_info;
 324         u32 guest_activity_state;
 325         u32 guest_sysenter_cs;
 326         u32 host_ia32_sysenter_cs;
 327         u32 vmx_preemption_timer_value;
 328         u32 padding32[7]; /* room for future expansion */
 329         u16 virtual_processor_id;
 330         u16 guest_es_selector;
 331         u16 guest_cs_selector;
 332         u16 guest_ss_selector;
 333         u16 guest_ds_selector;
 334         u16 guest_fs_selector;
 335         u16 guest_gs_selector;
 336         u16 guest_ldtr_selector;
 337         u16 guest_tr_selector;
 338         u16 host_es_selector;
 339         u16 host_cs_selector;
 340         u16 host_ss_selector;
 341         u16 host_ds_selector;
 342         u16 host_fs_selector;
 343         u16 host_gs_selector;
 344         u16 host_tr_selector;
 345 };
 346
 347 /*
 348  * VMCS12_REVISION is an arbitrary id that should be changed if the content or
 349  * layout of struct vmcs12 is changed. MSR_IA32_VMX_BASIC returns this id, and
 350  * VMPTRLD verifies that the VMCS region that L1 is loading contains this id.
 351  */
 352 #define VMCS12_REVISION 0x11e57ed0
 353
 354 /*
 355  * VMCS12_SIZE is the number of bytes L1 should allocate for the VMXON region
 356  * and any VMCS region. Although only sizeof(struct vmcs12) are used by the
 357  * current implementation, 4K are reserved to avoid future complications.
 358  */
 359 #define VMCS12_SIZE 0x1000
 360
 361 /* Used to remember the last vmcs02 used for some recently used vmcs12s */
 362 struct vmcs02_list {
 363         struct list_head list;
 364         gpa_t vmptr;
 365         struct loaded_vmcs vmcs02;
 366 };
 367
 368 /*
 369  * The nested_vmx structure is part of vcpu_vmx, and holds information we need
 370  * for correct emulation of VMX (i.e., nested VMX) on this vcpu.
 371  */
 372 struct nested_vmx {
 373         /* Has the level1 guest done vmxon? */
 374         bool vmxon;
 375         gpa_t vmxon_ptr;
 376
 377         /* The guest-physical address of the current VMCS L1 keeps for L2 */
 378         gpa_t current_vmptr;
 379         /* The host-usable pointer to the above */
 380         struct page *current_vmcs12_page;
 381         struct vmcs12 *current_vmcs12;
 382         struct vmcs *current_shadow_vmcs;
 383         /*
 384          * Indicates if the shadow vmcs must be updated with the
 385          * data hold by vmcs12
 386          */
 387         bool sync_shadow_vmcs;
 388
 389         /* vmcs02_list cache of VMCSs recently used to run L2 guests */
 390         struct list_head vmcs02_pool;
 391         int vmcs02_num;
 392         u64 vmcs01_tsc_offset;
 393         /* L2 must run next, and mustn't decide to exit to L1. */
 394         bool nested_run_pending;
 395         /*
 396          * Guest pages referred to in vmcs02 with host-physical pointers, so
 397          * we must keep them pinned while L2 runs.
 398          */
 399         struct page *apic_access_page;
 400         struct page *virtual_apic_page;
 401         u64 msr_ia32_feature_control;
 402
 403         struct hrtimer preemption_timer;
 404         bool preemption_timer_expired;
 405
 406         /* to migrate it to L2 if VM_ENTRY_LOAD_DEBUG_CONTROLS is off */
 407         u64 vmcs01_debugctl;
 408 };
 409
 410 #define POSTED_INTR_ON  0
 411 /* Posted-Interrupt Descriptor */
 412 struct pi_desc {
 413         u32 pir[8];     /* Posted interrupt requested */
 414         u32 control;    /* bit 0 of control is outstanding notification bit */
 415         u32 rsvd[7];
 416 } __aligned(64);
 417
 418 static bool pi_test_and_set_on(struct pi_desc *pi_desc)
 419 {
 420         return test_and_set_bit(POSTED_INTR_ON,
 421                         (unsigned long *)&pi_desc->control);
 422 }
 423
 424 static bool pi_test_and_clear_on(struct pi_desc *pi_desc)
 425 {
 426         return test_and_clear_bit(POSTED_INTR_ON,
 427                         (unsigned long *)&pi_desc->control);
 428 }
 429
 430 static int pi_test_and_set_pir(int vector, struct pi_desc *pi_desc)
 431 {
 432         return test_and_set_bit(vector, (unsigned long *)pi_desc->pir);
 433 }
 434
 435 struct vcpu_vmx {
 436         struct kvm_vcpu       vcpu;
 437         unsigned long         host_rsp;
 438         u8                    fail;
 439         bool                  nmi_known_unmasked;
 440         u32                   exit_intr_info;
 441         u32                   idt_vectoring_info;
 442         ulong                 rflags;
 443         struct shared_msr_entry *guest_msrs;
 444         int                   nmsrs;
 445         int                   save_nmsrs;
 446         unsigned long         host_idt_base;
 447 #ifdef CONFIG_X86_64
 448         u64                   msr_host_kernel_gs_base;
 449         u64                   msr_guest_kernel_gs_base;
 450 #endif
 451         u32 vm_entry_controls_shadow;
 452         u32 vm_exit_controls_shadow;
 453         /*
 454          * loaded_vmcs points to the VMCS currently used in this vcpu. For a
 455          * non-nested (L1) guest, it always points to vmcs01. For a nested
 456          * guest (L2), it points to a different VMCS.
 457          */
 458         struct loaded_vmcs    vmcs01;
 459         struct loaded_vmcs   *loaded_vmcs;
 460         bool                  __launched; /* temporary, used in vmx_vcpu_run */
 461         struct msr_autoload {
 462                 unsigned nr;
 463                 struct vmx_msr_entry guest[NR_AUTOLOAD_MSRS];
 464                 struct vmx_msr_entry host[NR_AUTOLOAD_MSRS];
 465         } msr_autoload;
 466         struct {
 467                 int           loaded;
 468                 u16           fs_sel, gs_sel, ldt_sel;
 469 #ifdef CONFIG_X86_64
 470                 u16           ds_sel, es_sel;
 471 #endif
 472                 int           gs_ldt_reload_needed;
 473                 int           fs_reload_needed;
 474                 u64           msr_host_bndcfgs;
 475                 unsigned long vmcs_host_cr4;    /* May not match real cr4 */
 476         } host_state;
 477         struct {
 478                 int vm86_active;
 479                 ulong save_rflags;
 480                 struct kvm_segment segs[8];
 481         } rmode;
 482         struct {
 483                 u32 bitmask; /* 4 bits per segment (1 bit per field) */
 484                 struct kvm_save_segment {
 485                         u16 selector;
 486                         unsigned long base;
 487                         u32 limit;
 488                         u32 ar;
 489                 } seg[8];
 490         } segment_cache;
 491         int vpid;
 492         bool emulation_required;
 493
 494         /* Support for vnmi-less CPUs */
 495         int soft_vnmi_blocked;
 496         ktime_t entry_time;
 497         s64 vnmi_blocked_time;
 498         u32 exit_reason;
 499
 500         bool rdtscp_enabled;
 501
 502         /* Posted interrupt descriptor */
 503         struct pi_desc pi_desc;
 504
 505         /* Support for a guest hypervisor (nested VMX) */
 506         struct nested_vmx nested;
 507
 508         /* Dynamic PLE window. */
 509         int ple_window;
 510         bool ple_window_dirty;
 511 };
 512
 513 enum segment_cache_field {
 514         SEG_FIELD_SEL = 0,
 515         SEG_FIELD_BASE = 1,
 516         SEG_FIELD_LIMIT = 2,
 517         SEG_FIELD_AR = 3,
 518
 519         SEG_FIELD_NR = 4
 520 };
 521
 522 static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
 523 {
 524         return container_of(vcpu, struct vcpu_vmx, vcpu);
 525 }
 526
 527 #define VMCS12_OFFSET(x) offsetof(struct vmcs12, x)
 528 #define FIELD(number, name)     [number] = VMCS12_OFFSET(name)
 529 #define FIELD64(number, name)   [number] = VMCS12_OFFSET(name), \
 530                                 [number##_HIGH] = VMCS12_OFFSET(name)+4
 531
 532
 533 static unsigned long shadow_read_only_fields[] = {
 534         /*
 535          * We do NOT shadow fields that are modified when L0
 536          * traps and emulates any vmx instruction (e.g. VMPTRLD,
 537          * VMXON...) executed by L1.
 538          * For example, VM_INSTRUCTION_ERROR is read
 539          * by L1 if a vmx instruction fails (part of the error path).
 540          * Note the code assumes this logic. If for some reason
 541          * we start shadowing these fields then we need to
 542          * force a shadow sync when L0 emulates vmx instructions
 543          * (e.g. force a sync if VM_INSTRUCTION_ERROR is modified
 544          * by nested_vmx_failValid)
 545          */
 546         VM_EXIT_REASON,
 547         VM_EXIT_INTR_INFO,
 548         VM_EXIT_INSTRUCTION_LEN,
 549         IDT_VECTORING_INFO_FIELD,
 550         IDT_VECTORING_ERROR_CODE,
 551         VM_EXIT_INTR_ERROR_CODE,
 552         EXIT_QUALIFICATION,
 553         GUEST_LINEAR_ADDRESS,
 554         GUEST_PHYSICAL_ADDRESS
 555 };
 556 static int max_shadow_read_only_fields =
 557         ARRAY_SIZE(shadow_read_only_fields);
 558
 559 static unsigned long shadow_read_write_fields[] = {
 560         TPR_THRESHOLD,
 561         GUEST_RIP,
 562         GUEST_RSP,
 563         GUEST_CR0,
 564         GUEST_CR3,
 565         GUEST_CR4,
 566         GUEST_INTERRUPTIBILITY_INFO,
 567         GUEST_RFLAGS,
 568         GUEST_CS_SELECTOR,
 569         GUEST_CS_AR_BYTES,
 570         GUEST_CS_LIMIT,
 571         GUEST_CS_BASE,
 572         GUEST_ES_BASE,
 573         GUEST_BNDCFGS,
 574         CR0_GUEST_HOST_MASK,
 575         CR0_READ_SHADOW,
 576         CR4_READ_SHADOW,
 577         TSC_OFFSET,
 578         EXCEPTION_BITMAP,
 579         CPU_BASED_VM_EXEC_CONTROL,
 580         VM_ENTRY_EXCEPTION_ERROR_CODE,
 581         VM_ENTRY_INTR_INFO_FIELD,
 582         VM_ENTRY_INSTRUCTION_LEN,
 583         VM_ENTRY_EXCEPTION_ERROR_CODE,
 584         HOST_FS_BASE,
 585         HOST_GS_BASE,
 586         HOST_FS_SELECTOR,
 587         HOST_GS_SELECTOR
 588 };
 589 static int max_shadow_read_write_fields =
 590         ARRAY_SIZE(shadow_read_write_fields);
 591
 592 static const unsigned short vmcs_field_to_offset_table[] = {
 593         FIELD(VIRTUAL_PROCESSOR_ID, virtual_processor_id),
 594         FIELD(GUEST_ES_SELECTOR, guest_es_selector),
 595         FIELD(GUEST_CS_SELECTOR, guest_cs_selector),
 596         FIELD(GUEST_SS_SELECTOR, guest_ss_selector),
 597         FIELD(GUEST_DS_SELECTOR, guest_ds_selector),
 598         FIELD(GUEST_FS_SELECTOR, guest_fs_selector),
 599         FIELD(GUEST_GS_SELECTOR, guest_gs_selector),
 600         FIELD(GUEST_LDTR_SELECTOR, guest_ldtr_selector),
 601         FIELD(GUEST_TR_SELECTOR, guest_tr_selector),
 602         FIELD(HOST_ES_SELECTOR, host_es_selector),
 603         FIELD(HOST_CS_SELECTOR, host_cs_selector),
 604         FIELD(HOST_SS_SELECTOR, host_ss_selector),
 605         FIELD(HOST_DS_SELECTOR, host_ds_selector),
 606         FIELD(HOST_FS_SELECTOR, host_fs_selector),
 607         FIELD(HOST_GS_SELECTOR, host_gs_selector),
 608         FIELD(HOST_TR_SELECTOR, host_tr_selector),
 609         FIELD64(IO_BITMAP_A, io_bitmap_a),
 610         FIELD64(IO_BITMAP_B, io_bitmap_b),
 611         FIELD64(MSR_BITMAP, msr_bitmap),
 612         FIELD64(VM_EXIT_MSR_STORE_ADDR, vm_exit_msr_store_addr),
 613         FIELD64(VM_EXIT_MSR_LOAD_ADDR, vm_exit_msr_load_addr),
 614         FIELD64(VM_ENTRY_MSR_LOAD_ADDR, vm_entry_msr_load_addr),
 615         FIELD64(TSC_OFFSET, tsc_offset),
 616         FIELD64(VIRTUAL_APIC_PAGE_ADDR, virtual_apic_page_addr),
 617         FIELD64(APIC_ACCESS_ADDR, apic_access_addr),
 618         FIELD64(EPT_POINTER, ept_pointer),
 619         FIELD64(GUEST_PHYSICAL_ADDRESS, guest_physical_address),
 620         FIELD64(VMCS_LINK_POINTER, vmcs_link_pointer),
 621         FIELD64(GUEST_IA32_DEBUGCTL, guest_ia32_debugctl),
 622         FIELD64(GUEST_IA32_PAT, guest_ia32_pat),
 623         FIELD64(GUEST_IA32_EFER, guest_ia32_efer),
 624         FIELD64(GUEST_IA32_PERF_GLOBAL_CTRL, guest_ia32_perf_global_ctrl),
 625         FIELD64(GUEST_PDPTR0, guest_pdptr0),
 626         FIELD64(GUEST_PDPTR1, guest_pdptr1),
 627         FIELD64(GUEST_PDPTR2, guest_pdptr2),
 628         FIELD64(GUEST_PDPTR3, guest_pdptr3),
 629         FIELD64(GUEST_BNDCFGS, guest_bndcfgs),
 630         FIELD64(HOST_IA32_PAT, host_ia32_pat),
 631         FIELD64(HOST_IA32_EFER, host_ia32_efer),
 632         FIELD64(HOST_IA32_PERF_GLOBAL_CTRL, host_ia32_perf_global_ctrl),
 633         FIELD(PIN_BASED_VM_EXEC_CONTROL, pin_based_vm_exec_control),
 634         FIELD(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control),
 635         FIELD(EXCEPTION_BITMAP, exception_bitmap),
 636         FIELD(PAGE_FAULT_ERROR_CODE_MASK, page_fault_error_code_mask),
 637         FIELD(PAGE_FAULT_ERROR_CODE_MATCH, page_fault_error_code_match),
 638         FIELD(CR3_TARGET_COUNT, cr3_target_count),
 639         FIELD(VM_EXIT_CONTROLS, vm_exit_controls),
 640         FIELD(VM_EXIT_MSR_STORE_COUNT, vm_exit_msr_store_count),
 641         FIELD(VM_EXIT_MSR_LOAD_COUNT, vm_exit_msr_load_count),
 642         FIELD(VM_ENTRY_CONTROLS, vm_entry_controls),
 643         FIELD(VM_ENTRY_MSR_LOAD_COUNT, vm_entry_msr_load_count),
 644         FIELD(VM_ENTRY_INTR_INFO_FIELD, vm_entry_intr_info_field),
 645         FIELD(VM_ENTRY_EXCEPTION_ERROR_CODE, vm_entry_exception_error_code),
 646         FIELD(VM_ENTRY_INSTRUCTION_LEN, vm_entry_instruction_len),
 647         FIELD(TPR_THRESHOLD, tpr_threshold),
 648         FIELD(SECONDARY_VM_EXEC_CONTROL, secondary_vm_exec_control),
 649         FIELD(VM_INSTRUCTION_ERROR, vm_instruction_error),
 650         FIELD(VM_EXIT_REASON, vm_exit_reason),
 651         FIELD(VM_EXIT_INTR_INFO, vm_exit_intr_info),
 652         FIELD(VM_EXIT_INTR_ERROR_CODE, vm_exit_intr_error_code),
 653         FIELD(IDT_VECTORING_INFO_FIELD, idt_vectoring_info_field),
 654         FIELD(IDT_VECTORING_ERROR_CODE, idt_vectoring_error_code),
 655         FIELD(VM_EXIT_INSTRUCTION_LEN, vm_exit_instruction_len),
 656         FIELD(VMX_INSTRUCTION_INFO, vmx_instruction_info),
 657         FIELD(GUEST_ES_LIMIT, guest_es_limit),
 658         FIELD(GUEST_CS_LIMIT, guest_cs_limit),
 659         FIELD(GUEST_SS_LIMIT, guest_ss_limit),
 660         FIELD(GUEST_DS_LIMIT, guest_ds_limit),
 661         FIELD(GUEST_FS_LIMIT, guest_fs_limit),
 662         FIELD(GUEST_GS_LIMIT, guest_gs_limit),
 663         FIELD(GUEST_LDTR_LIMIT, guest_ldtr_limit),
 664         FIELD(GUEST_TR_LIMIT, guest_tr_limit),
 665         FIELD(GUEST_GDTR_LIMIT, guest_gdtr_limit),
 666         FIELD(GUEST_IDTR_LIMIT, guest_idtr_limit),
 667         FIELD(GUEST_ES_AR_BYTES, guest_es_ar_bytes),
 668         FIELD(GUEST_CS_AR_BYTES, guest_cs_ar_bytes),
 669         FIELD(GUEST_SS_AR_BYTES, guest_ss_ar_bytes),
 670         FIELD(GUEST_DS_AR_BYTES, guest_ds_ar_bytes),
 671         FIELD(GUEST_FS_AR_BYTES, guest_fs_ar_bytes),
 672         FIELD(GUEST_GS_AR_BYTES, guest_gs_ar_bytes),
 673         FIELD(GUEST_LDTR_AR_BYTES, guest_ldtr_ar_bytes),
 674         FIELD(GUEST_TR_AR_BYTES, guest_tr_ar_bytes),
 675         FIELD(GUEST_INTERRUPTIBILITY_INFO, guest_interruptibility_info),
 676         FIELD(GUEST_ACTIVITY_STATE, guest_activity_state),
 677         FIELD(GUEST_SYSENTER_CS, guest_sysenter_cs),
 678         FIELD(HOST_IA32_SYSENTER_CS, host_ia32_sysenter_cs),
 679         FIELD(VMX_PREEMPTION_TIMER_VALUE, vmx_preemption_timer_value),
 680         FIELD(CR0_GUEST_HOST_MASK, cr0_guest_host_mask),
 681         FIELD(CR4_GUEST_HOST_MASK, cr4_guest_host_mask),
 682         FIELD(CR0_READ_SHADOW, cr0_read_shadow),
 683         FIELD(CR4_READ_SHADOW, cr4_read_shadow),
 684         FIELD(CR3_TARGET_VALUE0, cr3_target_value0),
 685         FIELD(CR3_TARGET_VALUE1, cr3_target_value1),
 686         FIELD(CR3_TARGET_VALUE2, cr3_target_value2),
 687         FIELD(CR3_TARGET_VALUE3, cr3_target_value3),
 688         FIELD(EXIT_QUALIFICATION, exit_qualification),
 689         FIELD(GUEST_LINEAR_ADDRESS, guest_linear_address),
 690         FIELD(GUEST_CR0, guest_cr0),
 691         FIELD(GUEST_CR3, guest_cr3),
 692         FIELD(GUEST_CR4, guest_cr4),
 693         FIELD(GUEST_ES_BASE, guest_es_base),
 694         FIELD(GUEST_CS_BASE, guest_cs_base),
 695         FIELD(GUEST_SS_BASE, guest_ss_base),
 696         FIELD(GUEST_DS_BASE, guest_ds_base),
 697         FIELD(GUEST_FS_BASE, guest_fs_base),
 698         FIELD(GUEST_GS_BASE, guest_gs_base),
 699         FIELD(GUEST_LDTR_BASE, guest_ldtr_base),
 700         FIELD(GUEST_TR_BASE, guest_tr_base),
 701         FIELD(GUEST_GDTR_BASE, guest_gdtr_base),
 702         FIELD(GUEST_IDTR_BASE, guest_idtr_base),
 703         FIELD(GUEST_DR7, guest_dr7),
 704         FIELD(GUEST_RSP, guest_rsp),
 705         FIELD(GUEST_RIP, guest_rip),
 706         FIELD(GUEST_RFLAGS, guest_rflags),
 707         FIELD(GUEST_PENDING_DBG_EXCEPTIONS, guest_pending_dbg_exceptions),
 708         FIELD(GUEST_SYSENTER_ESP, guest_sysenter_esp),
 709         FIELD(GUEST_SYSENTER_EIP, guest_sysenter_eip),
 710         FIELD(HOST_CR0, host_cr0),
 711         FIELD(HOST_CR3, host_cr3),
 712         FIELD(HOST_CR4, host_cr4),
 713         FIELD(HOST_FS_BASE, host_fs_base),
 714         FIELD(HOST_GS_BASE, host_gs_base),
 715         FIELD(HOST_TR_BASE, host_tr_base),
 716         FIELD(HOST_GDTR_BASE, host_gdtr_base),
 717         FIELD(HOST_IDTR_BASE, host_idtr_base),
 718         FIELD(HOST_IA32_SYSENTER_ESP, host_ia32_sysenter_esp),
 719         FIELD(HOST_IA32_SYSENTER_EIP, host_ia32_sysenter_eip),
 720         FIELD(HOST_RSP, host_rsp),
 721         FIELD(HOST_RIP, host_rip),
 722 };
 723 static const int max_vmcs_field = ARRAY_SIZE(vmcs_field_to_offset_table);
 724
 725 static inline short vmcs_field_to_offset(unsigned long field)
 726 {
 727         if (field >= max_vmcs_field || vmcs_field_to_offset_table[field] == 0)
 728                 return -1;
 729         return vmcs_field_to_offset_table[field];
 730 }
 731
 732 static inline struct vmcs12 *get_vmcs12(struct kvm_vcpu *vcpu)
 733 {
 734         return to_vmx(vcpu)->nested.current_vmcs12;
 735 }
 736
 737 static struct page *nested_get_page(struct kvm_vcpu *vcpu, gpa_t addr)
 738 {
 739         struct page *page = gfn_to_page(vcpu->kvm, addr >> PAGE_SHIFT);
 740         if (is_error_page(page))
 741                 return NULL;
 742
 743         return page;
 744 }
 745
 746 static void nested_release_page(struct page *page)
 747 {
 748         kvm_release_page_dirty(page);
 749 }
 750
 751 static void nested_release_page_clean(struct page *page)
 752 {
 753         kvm_release_page_clean(page);
 754 }
 755
 756 static unsigned long nested_ept_get_cr3(struct kvm_vcpu *vcpu);
 757 static u64 construct_eptp(unsigned long root_hpa);
 758 static void kvm_cpu_vmxon(u64 addr);
 759 static void kvm_cpu_vmxoff(void);
 760 static bool vmx_mpx_supported(void);
 761 static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr);
 762 static void vmx_set_segment(struct kvm_vcpu *vcpu,
 763                             struct kvm_segment *var, int seg);
 764 static void vmx_get_segment(struct kvm_vcpu *vcpu,
 765                             struct kvm_segment *var, int seg);
 766 static bool guest_state_valid(struct kvm_vcpu *vcpu);
 767 static u32 vmx_segment_access_rights(struct kvm_segment *var);
 768 static void vmx_sync_pir_to_irr_dummy(struct kvm_vcpu *vcpu);
 769 static void copy_vmcs12_to_shadow(struct vcpu_vmx *vmx);
 770 static void copy_shadow_to_vmcs12(struct vcpu_vmx *vmx);
 771 static int alloc_identity_pagetable(struct kvm *kvm);
 772
 773 static DEFINE_PER_CPU(struct vmcs *, vmxarea);
 774 static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
 775 /*
 776  * We maintain a per-CPU linked-list of VMCS loaded on that CPU. This is needed
 777  * when a CPU is brought down, and we need to VMCLEAR all VMCSs loaded on it.
 778  */
 779 static DEFINE_PER_CPU(struct list_head, loaded_vmcss_on_cpu);
 780 static DEFINE_PER_CPU(struct desc_ptr, host_gdt);
 781
 782 static unsigned long *vmx_io_bitmap_a;
 783 static unsigned long *vmx_io_bitmap_b;
 784 static unsigned long *vmx_msr_bitmap_legacy;
 785 static unsigned long *vmx_msr_bitmap_longmode;
 786 static unsigned long *vmx_msr_bitmap_legacy_x2apic;
 787 static unsigned long *vmx_msr_bitmap_longmode_x2apic;
 788 static unsigned long *vmx_vmread_bitmap;
 789 static unsigned long *vmx_vmwrite_bitmap;
 790
 791 static bool cpu_has_load_ia32_efer;
 792 static bool cpu_has_load_perf_global_ctrl;
 793
 794 static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS);
 795 static DEFINE_SPINLOCK(vmx_vpid_lock);
 796
 797 static struct vmcs_config {
 798         int size;
 799         int order;
 800         u32 revision_id;
 801         u32 pin_based_exec_ctrl;
 802         u32 cpu_based_exec_ctrl;
 803         u32 cpu_based_2nd_exec_ctrl;
 804         u32 vmexit_ctrl;
 805         u32 vmentry_ctrl;
 806 } vmcs_config;
 807
 808 static struct vmx_capability {
 809         u32 ept;
 810         u32 vpid;
 811 } vmx_capability;
 812
 813 #define VMX_SEGMENT_FIELD(seg)                                  \
 814         [VCPU_SREG_##seg] = {                                   \
 815                 .selector = GUEST_##seg##_SELECTOR,             \
 816                 .base = GUEST_##seg##_BASE,                     \
 817                 .limit = GUEST_##seg##_LIMIT,                   \
 818                 .ar_bytes = GUEST_##seg##_AR_BYTES,             \
 819         }
 820
 821 static const struct kvm_vmx_segment_field {
 822         unsigned selector;
 823         unsigned base;
 824         unsigned limit;
 825         unsigned ar_bytes;
 826 } kvm_vmx_segment_fields[] = {
 827         VMX_SEGMENT_FIELD(CS),
 828         VMX_SEGMENT_FIELD(DS),
 829         VMX_SEGMENT_FIELD(ES),
 830         VMX_SEGMENT_FIELD(FS),
 831         VMX_SEGMENT_FIELD(GS),
 832         VMX_SEGMENT_FIELD(SS),
 833         VMX_SEGMENT_FIELD(TR),
 834         VMX_SEGMENT_FIELD(LDTR),
 835 };
 836
 837 static u64 host_efer;
 838
 839 static void ept_save_pdptrs(struct kvm_vcpu *vcpu);
 840
 841 /*
 842  * Keep MSR_STAR at the end, as setup_msrs() will try to optimize it
 843  * away by decrementing the array size.
 844  */
 845 static const u32 vmx_msr_index[] = {
 846 #ifdef CONFIG_X86_64
 847         MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR,
 848 #endif
 849         MSR_EFER, MSR_TSC_AUX, MSR_STAR,
 850 };
 851
 852 static inline bool is_page_fault(u32 intr_info)
 853 {
 854         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
 855                              INTR_INFO_VALID_MASK)) ==
 856                 (INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
 857 }
 858
 859 static inline bool is_no_device(u32 intr_info)
 860 {
 861         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
 862                              INTR_INFO_VALID_MASK)) ==
 863                 (INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
 864 }
 865
 866 static inline bool is_invalid_opcode(u32 intr_info)
 867 {
 868         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
 869                              INTR_INFO_VALID_MASK)) ==
 870                 (INTR_TYPE_HARD_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
 871 }
 872
 873 static inline bool is_external_interrupt(u32 intr_info)
 874 {
 875         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
 876                 == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
 877 }
 878
 879 static inline bool is_machine_check(u32 intr_info)
 880 {
 881         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
 882                              INTR_INFO_VALID_MASK)) ==
 883                 (INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK);
 884 }
 885
 886 static inline bool cpu_has_vmx_msr_bitmap(void)
 887 {
 888         return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS;
 889 }
 890
 891 static inline bool cpu_has_vmx_tpr_shadow(void)
 892 {
 893         return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW;
 894 }
 895
 896 static inline bool vm_need_tpr_shadow(struct kvm *kvm)
 897 {
 898         return (cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm));
 899 }
 900
 901 static inline bool cpu_has_secondary_exec_ctrls(void)
 902 {
 903         return vmcs_config.cpu_based_exec_ctrl &
 904                 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
 905 }
 906
 907 static inline bool cpu_has_vmx_virtualize_apic_accesses(void)
 908 {
 909         return vmcs_config.cpu_based_2nd_exec_ctrl &
 910                 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
 911 }
 912
 913 static inline bool cpu_has_vmx_virtualize_x2apic_mode(void)
 914 {
 915         return vmcs_config.cpu_based_2nd_exec_ctrl &
 916                 SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE;
 917 }
 918
 919 static inline bool cpu_has_vmx_apic_register_virt(void)
 920 {
 921         return vmcs_config.cpu_based_2nd_exec_ctrl &
 922                 SECONDARY_EXEC_APIC_REGISTER_VIRT;
 923 }
 924
 925 static inline bool cpu_has_vmx_virtual_intr_delivery(void)
 926 {
 927         return vmcs_config.cpu_based_2nd_exec_ctrl &
 928                 SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY;
 929 }
 930
 931 static inline bool cpu_has_vmx_posted_intr(void)
 932 {
 933         return vmcs_config.pin_based_exec_ctrl & PIN_BASED_POSTED_INTR;
 934 }
 935
 936 static inline bool cpu_has_vmx_apicv(void)
 937 {
 938         return cpu_has_vmx_apic_register_virt() &&
 939                 cpu_has_vmx_virtual_intr_delivery() &&
 940                 cpu_has_vmx_posted_intr();
 941 }
 942
 943 static inline bool cpu_has_vmx_flexpriority(void)
 944 {
 945         return cpu_has_vmx_tpr_shadow() &&
 946                 cpu_has_vmx_virtualize_apic_accesses();
 947 }
 948
 949 static inline bool cpu_has_vmx_ept_execute_only(void)
 950 {
 951         return vmx_capability.ept & VMX_EPT_EXECUTE_ONLY_BIT;
 952 }
 953
 954 static inline bool cpu_has_vmx_eptp_uncacheable(void)
 955 {
 956         return vmx_capability.ept & VMX_EPTP_UC_BIT;
 957 }
 958
 959 static inline bool cpu_has_vmx_eptp_writeback(void)
 960 {
 961         return vmx_capability.ept & VMX_EPTP_WB_BIT;
 962 }
 963
 964 static inline bool cpu_has_vmx_ept_2m_page(void)
 965 {
 966         return vmx_capability.ept & VMX_EPT_2MB_PAGE_BIT;
 967 }
 968
 969 static inline bool cpu_has_vmx_ept_1g_page(void)
 970 {
 971         return vmx_capability.ept & VMX_EPT_1GB_PAGE_BIT;
 972 }
 973
 974 static inline bool cpu_has_vmx_ept_4levels(void)
 975 {
 976         return vmx_capability.ept & VMX_EPT_PAGE_WALK_4_BIT;
 977 }
 978
 979 static inline bool cpu_has_vmx_ept_ad_bits(void)
 980 {
 981         return vmx_capability.ept & VMX_EPT_AD_BIT;
 982 }
 983
 984 static inline bool cpu_has_vmx_invept_context(void)
 985 {
 986         return vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT;
 987 }
 988
 989 static inline bool cpu_has_vmx_invept_global(void)
 990 {
 991         return vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT;
 992 }
 993
 994 static inline bool cpu_has_vmx_invvpid_single(void)
 995 {
 996         return vmx_capability.vpid & VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT;
 997 }
 998
 999 static inline bool cpu_has_vmx_invvpid_global(void)
1000 {
1001         return vmx_capability.vpid & VMX_VPID_EXTENT_GLOBAL_CONTEXT_BIT;
1002 }
1003
1004 static inline bool cpu_has_vmx_ept(void)
1005 {
1006         return vmcs_config.cpu_based_2nd_exec_ctrl &
1007                 SECONDARY_EXEC_ENABLE_EPT;
1008 }
1009
1010 static inline bool cpu_has_vmx_unrestricted_guest(void)
1011 {
1012         return vmcs_config.cpu_based_2nd_exec_ctrl &
1013                 SECONDARY_EXEC_UNRESTRICTED_GUEST;
1014 }
1015
1016 static inline bool cpu_has_vmx_ple(void)
1017 {
1018         return vmcs_config.cpu_based_2nd_exec_ctrl &
1019                 SECONDARY_EXEC_PAUSE_LOOP_EXITING;
1020 }
1021
1022 static inline bool vm_need_virtualize_apic_accesses(struct kvm *kvm)
1023 {
1024         return flexpriority_enabled && irqchip_in_kernel(kvm);
1025 }
1026
1027 static inline bool cpu_has_vmx_vpid(void)
1028 {
1029         return vmcs_config.cpu_based_2nd_exec_ctrl &
1030                 SECONDARY_EXEC_ENABLE_VPID;
1031 }
1032
1033 static inline bool cpu_has_vmx_rdtscp(void)
1034 {
1035         return vmcs_config.cpu_based_2nd_exec_ctrl &
1036                 SECONDARY_EXEC_RDTSCP;
1037 }
1038
1039 static inline bool cpu_has_vmx_invpcid(void)
1040 {
1041         return vmcs_config.cpu_based_2nd_exec_ctrl &
1042                 SECONDARY_EXEC_ENABLE_INVPCID;
1043 }
1044
1045 static inline bool cpu_has_virtual_nmis(void)
1046 {
1047         return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS;
1048 }
1049
1050 static inline bool cpu_has_vmx_wbinvd_exit(void)
1051 {
1052         return vmcs_config.cpu_based_2nd_exec_ctrl &
1053                 SECONDARY_EXEC_WBINVD_EXITING;
1054 }
1055
1056 static inline bool cpu_has_vmx_shadow_vmcs(void)
1057 {
1058         u64 vmx_msr;
1059         rdmsrl(MSR_IA32_VMX_MISC, vmx_msr);
1060         /* check if the cpu supports writing r/o exit information fields */
1061         if (!(vmx_msr & MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS))
1062                 return false;
1063
1064         return vmcs_config.cpu_based_2nd_exec_ctrl &
1065                 SECONDARY_EXEC_SHADOW_VMCS;
1066 }
1067
1068 static inline bool report_flexpriority(void)
1069 {
1070         return flexpriority_enabled;
1071 }
1072
1073 static inline bool nested_cpu_has(struct vmcs12 *vmcs12, u32 bit)
1074 {
1075         return vmcs12->cpu_based_vm_exec_control & bit;
1076 }
1077
1078 static inline bool nested_cpu_has2(struct vmcs12 *vmcs12, u32 bit)
1079 {
1080         return (vmcs12->cpu_based_vm_exec_control &
1081                         CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) &&
1082                 (vmcs12->secondary_vm_exec_control & bit);
1083 }
1084
1085 static inline bool nested_cpu_has_virtual_nmis(struct vmcs12 *vmcs12)
1086 {
1087         return vmcs12->pin_based_vm_exec_control & PIN_BASED_VIRTUAL_NMIS;
1088 }
1089
1090 static inline bool nested_cpu_has_preemption_timer(struct vmcs12 *vmcs12)
1091 {
1092         return vmcs12->pin_based_vm_exec_control &
1093                 PIN_BASED_VMX_PREEMPTION_TIMER;
1094 }
1095
1096 static inline int nested_cpu_has_ept(struct vmcs12 *vmcs12)
1097 {
1098         return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_EPT);
1099 }
1100
1101 static inline bool is_exception(u32 intr_info)
1102 {
1103         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
1104                 == (INTR_TYPE_HARD_EXCEPTION | INTR_INFO_VALID_MASK);
1105 }
1106
1107 static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
1108                               u32 exit_intr_info,
1109                               unsigned long exit_qualification);
1110 static void nested_vmx_entry_failure(struct kvm_vcpu *vcpu,
1111                         struct vmcs12 *vmcs12,
1112                         u32 reason, unsigned long qualification);
1113
1114 static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr)
1115 {
1116         int i;
1117
1118         for (i = 0; i < vmx->nmsrs; ++i)
1119                 if (vmx_msr_index[vmx->guest_msrs[i].index] == msr)
1120                         return i;
1121         return -1;
1122 }
1123
1124 static inline void __invvpid(int ext, u16 vpid, gva_t gva)
1125 {
1126     struct {
1127         u64 vpid : 16;
1128         u64 rsvd : 48;
1129         u64 gva;
1130     } operand = { vpid, 0, gva };
1131
1132     asm volatile (__ex(ASM_VMX_INVVPID)
1133                   /* CF==1 or ZF==1 --> rc = -1 */
1134                   "; ja 1f ; ud2 ; 1:"
1135                   : : "a"(&operand), "c"(ext) : "cc", "memory");
1136 }
1137
1138 static inline void __invept(int ext, u64 eptp, gpa_t gpa)
1139 {
1140         struct {
1141                 u64 eptp, gpa;
1142         } operand = {eptp, gpa};
1143
1144         asm volatile (__ex(ASM_VMX_INVEPT)
1145                         /* CF==1 or ZF==1 --> rc = -1 */
1146                         "; ja 1f ; ud2 ; 1:\n"
1147                         : : "a" (&operand), "c" (ext) : "cc", "memory");
1148 }
1149
1150 static struct shared_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr)
1151 {
1152         int i;
1153
1154         i = __find_msr_index(vmx, msr);
1155         if (i >= 0)
1156                 return &vmx->guest_msrs[i];
1157         return NULL;
1158 }
1159
1160 static void vmcs_clear(struct vmcs *vmcs)
1161 {
1162         u64 phys_addr = __pa(vmcs);
1163         u8 error;
1164
1165         asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) "; setna %0"
1166                       : "=qm"(error) : "a"(&phys_addr), "m"(phys_addr)
1167                       : "cc", "memory");
1168         if (error)
1169                 printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
1170                        vmcs, phys_addr);
1171 }
1172
1173 static inline void loaded_vmcs_init(struct loaded_vmcs *loaded_vmcs)
1174 {
1175         vmcs_clear(loaded_vmcs->vmcs);
1176         loaded_vmcs->cpu = -1;
1177         loaded_vmcs->launched = 0;
1178 }
1179
1180 static void vmcs_load(struct vmcs *vmcs)
1181 {
1182         u64 phys_addr = __pa(vmcs);
1183         u8 error;
1184
1185         asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
1186                         : "=qm"(error) : "a"(&phys_addr), "m"(phys_addr)
1187                         : "cc", "memory");
1188         if (error)
1189                 printk(KERN_ERR "kvm: vmptrld %p/%llx failed\n",
1190                        vmcs, phys_addr);
1191 }
1192
1193 #ifdef CONFIG_KEXEC
1194 /*
1195  * This bitmap is used to indicate whether the vmclear
1196  * operation is enabled on all cpus. All disabled by
1197  * default.
1198  */
1199 static cpumask_t crash_vmclear_enabled_bitmap = CPU_MASK_NONE;
1200
1201 static inline void crash_enable_local_vmclear(int cpu)
1202 {
1203         cpumask_set_cpu(cpu, &crash_vmclear_enabled_bitmap);
1204 }
1205
1206 static inline void crash_disable_local_vmclear(int cpu)
1207 {
1208         cpumask_clear_cpu(cpu, &crash_vmclear_enabled_bitmap);
1209 }
1210
1211 static inline int crash_local_vmclear_enabled(int cpu)
1212 {
1213         return cpumask_test_cpu(cpu, &crash_vmclear_enabled_bitmap);
1214 }
1215
1216 static void crash_vmclear_local_loaded_vmcss(void)
1217 {
1218         int cpu = raw_smp_processor_id();
1219         struct loaded_vmcs *v;
1220
1221         if (!crash_local_vmclear_enabled(cpu))
1222                 return;
1223
1224         list_for_each_entry(v, &per_cpu(loaded_vmcss_on_cpu, cpu),
1225                             loaded_vmcss_on_cpu_link)
1226                 vmcs_clear(v->vmcs);
1227 }
1228 #else
1229 static inline void crash_enable_local_vmclear(int cpu) { }
1230 static inline void crash_disable_local_vmclear(int cpu) { }
1231 #endif /* CONFIG_KEXEC */
1232
1233 static void __loaded_vmcs_clear(void *arg)
1234 {
1235         struct loaded_vmcs *loaded_vmcs = arg;
1236         int cpu = raw_smp_processor_id();
1237
1238         if (loaded_vmcs->cpu != cpu)
1239                 return; /* vcpu migration can race with cpu offline */
1240         if (per_cpu(current_vmcs, cpu) == loaded_vmcs->vmcs)
1241                 per_cpu(current_vmcs, cpu) = NULL;
1242         crash_disable_local_vmclear(cpu);
1243         list_del(&loaded_vmcs->loaded_vmcss_on_cpu_link);
1244
1245         /*
1246          * we should ensure updating loaded_vmcs->loaded_vmcss_on_cpu_link
1247          * is before setting loaded_vmcs->vcpu to -1 which is done in
1248          * loaded_vmcs_init. Otherwise, other cpu can see vcpu = -1 fist
1249          * then adds the vmcs into percpu list before it is deleted.
1250          */
1251         smp_wmb();
1252
1253         loaded_vmcs_init(loaded_vmcs);
1254         crash_enable_local_vmclear(cpu);
1255 }
1256
1257 static void loaded_vmcs_clear(struct loaded_vmcs *loaded_vmcs)
1258 {
1259         int cpu = loaded_vmcs->cpu;
1260
1261         if (cpu != -1)
1262                 smp_call_function_single(cpu,
1263                          __loaded_vmcs_clear, loaded_vmcs, 1);
1264 }
1265
1266 static inline void vpid_sync_vcpu_single(struct vcpu_vmx *vmx)
1267 {
1268         if (vmx->vpid == 0)
1269                 return;
1270
1271         if (cpu_has_vmx_invvpid_single())
1272                 __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0);
1273 }
1274
1275 static inline void vpid_sync_vcpu_global(void)
1276 {
1277         if (cpu_has_vmx_invvpid_global())
1278                 __invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
1279 }
1280
1281 static inline void vpid_sync_context(struct vcpu_vmx *vmx)
1282 {
1283         if (cpu_has_vmx_invvpid_single())
1284                 vpid_sync_vcpu_single(vmx);
1285         else
1286                 vpid_sync_vcpu_global();
1287 }
1288
1289 static inline void ept_sync_global(void)
1290 {
1291         if (cpu_has_vmx_invept_global())
1292                 __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
1293 }
1294
1295 static inline void ept_sync_context(u64 eptp)
1296 {
1297         if (enable_ept) {
1298                 if (cpu_has_vmx_invept_context())
1299                         __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
1300                 else
1301                         ept_sync_global();
1302         }
1303 }
1304
1305 static __always_inline unsigned long vmcs_readl(unsigned long field)
1306 {
1307         unsigned long value;
1308
1309         asm volatile (__ex_clear(ASM_VMX_VMREAD_RDX_RAX, "%0")
1310                       : "=a"(value) : "d"(field) : "cc");
1311         return value;
1312 }
1313
1314 static __always_inline u16 vmcs_read16(unsigned long field)
1315 {
1316         return vmcs_readl(field);
1317 }
1318
1319 static __always_inline u32 vmcs_read32(unsigned long field)
1320 {
1321         return vmcs_readl(field);
1322 }
1323
1324 static __always_inline u64 vmcs_read64(unsigned long field)
1325 {
1326 #ifdef CONFIG_X86_64
1327         return vmcs_readl(field);
1328 #else
1329         return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
1330 #endif
1331 }
1332
1333 static noinline void vmwrite_error(unsigned long field, unsigned long value)
1334 {
1335         printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
1336                field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
1337         dump_stack();
1338 }
1339
1340 static void vmcs_writel(unsigned long field, unsigned long value)
1341 {
1342         u8 error;
1343
1344         asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) "; setna %0"
1345                        : "=q"(error) : "a"(value), "d"(field) : "cc");
1346         if (unlikely(error))
1347                 vmwrite_error(field, value);
1348 }
1349
1350 static void vmcs_write16(unsigned long field, u16 value)
1351 {
1352         vmcs_writel(field, value);
1353 }
1354
1355 static void vmcs_write32(unsigned long field, u32 value)
1356 {
1357         vmcs_writel(field, value);
1358 }
1359
1360 static void vmcs_write64(unsigned long field, u64 value)
1361 {
1362         vmcs_writel(field, value);
1363 #ifndef CONFIG_X86_64
1364         asm volatile ("");
1365         vmcs_writel(field+1, value >> 32);
1366 #endif
1367 }
1368
1369 static void vmcs_clear_bits(unsigned long field, u32 mask)
1370 {
1371         vmcs_writel(field, vmcs_readl(field) & ~mask);
1372 }
1373
1374 static void vmcs_set_bits(unsigned long field, u32 mask)
1375 {
1376         vmcs_writel(field, vmcs_readl(field) | mask);
1377 }
1378
1379 static inline void vm_entry_controls_init(struct vcpu_vmx *vmx, u32 val)
1380 {
1381         vmcs_write32(VM_ENTRY_CONTROLS, val);
1382         vmx->vm_entry_controls_shadow = val;
1383 }
1384
1385 static inline void vm_entry_controls_set(struct vcpu_vmx *vmx, u32 val)
1386 {
1387         if (vmx->vm_entry_controls_shadow != val)
1388                 vm_entry_controls_init(vmx, val);
1389 }
1390
1391 static inline u32 vm_entry_controls_get(struct vcpu_vmx *vmx)
1392 {
1393         return vmx->vm_entry_controls_shadow;
1394 }
1395
1396
1397 static inline void vm_entry_controls_setbit(struct vcpu_vmx *vmx, u32 val)
1398 {
1399         vm_entry_controls_set(vmx, vm_entry_controls_get(vmx) | val);
1400 }
1401
1402 static inline void vm_entry_controls_clearbit(struct vcpu_vmx *vmx, u32 val)
1403 {
1404         vm_entry_controls_set(vmx, vm_entry_controls_get(vmx) & ~val);
1405 }
1406
1407 static inline void vm_exit_controls_init(struct vcpu_vmx *vmx, u32 val)
1408 {
1409         vmcs_write32(VM_EXIT_CONTROLS, val);
1410         vmx->vm_exit_controls_shadow = val;
1411 }
1412
1413 static inline void vm_exit_controls_set(struct vcpu_vmx *vmx, u32 val)
1414 {
1415         if (vmx->vm_exit_controls_shadow != val)
1416                 vm_exit_controls_init(vmx, val);
1417 }
1418
1419 static inline u32 vm_exit_controls_get(struct vcpu_vmx *vmx)
1420 {
1421         return vmx->vm_exit_controls_shadow;
1422 }
1423
1424
1425 static inline void vm_exit_controls_setbit(struct vcpu_vmx *vmx, u32 val)
1426 {
1427         vm_exit_controls_set(vmx, vm_exit_controls_get(vmx) | val);
1428 }
1429
1430 static inline void vm_exit_controls_clearbit(struct vcpu_vmx *vmx, u32 val)
1431 {
1432         vm_exit_controls_set(vmx, vm_exit_controls_get(vmx) & ~val);
1433 }
1434
1435 static void vmx_segment_cache_clear(struct vcpu_vmx *vmx)
1436 {
1437         vmx->segment_cache.bitmask = 0;
1438 }
1439
1440 static bool vmx_segment_cache_test_set(struct vcpu_vmx *vmx, unsigned seg,
1441                                        unsigned field)
1442 {
1443         bool ret;
1444         u32 mask = 1 << (seg * SEG_FIELD_NR + field);
1445
1446         if (!(vmx->vcpu.arch.regs_avail & (1 << VCPU_EXREG_SEGMENTS))) {
1447                 vmx->vcpu.arch.regs_avail |= (1 << VCPU_EXREG_SEGMENTS);
1448                 vmx->segment_cache.bitmask = 0;
1449         }
1450         ret = vmx->segment_cache.bitmask & mask;
1451         vmx->segment_cache.bitmask |= mask;
1452         return ret;
1453 }
1454
1455 static u16 vmx_read_guest_seg_selector(struct vcpu_vmx *vmx, unsigned seg)
1456 {
1457         u16 *p = &vmx->segment_cache.seg[seg].selector;
1458
1459         if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_SEL))
1460                 *p = vmcs_read16(kvm_vmx_segment_fields[seg].selector);
1461         return *p;
1462 }
1463
1464 static ulong vmx_read_guest_seg_base(struct vcpu_vmx *vmx, unsigned seg)
1465 {
1466         ulong *p = &vmx->segment_cache.seg[seg].base;
1467
1468         if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_BASE))
1469                 *p = vmcs_readl(kvm_vmx_segment_fields[seg].base);
1470         return *p;
1471 }
1472
1473 static u32 vmx_read_guest_seg_limit(struct vcpu_vmx *vmx, unsigned seg)
1474 {
1475         u32 *p = &vmx->segment_cache.seg[seg].limit;
1476
1477         if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_LIMIT))
1478                 *p = vmcs_read32(kvm_vmx_segment_fields[seg].limit);
1479         return *p;
1480 }
1481
1482 static u32 vmx_read_guest_seg_ar(struct vcpu_vmx *vmx, unsigned seg)
1483 {
1484         u32 *p = &vmx->segment_cache.seg[seg].ar;
1485
1486         if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_AR))
1487                 *p = vmcs_read32(kvm_vmx_segment_fields[seg].ar_bytes);
1488         return *p;
1489 }
1490
1491 static void update_exception_bitmap(struct kvm_vcpu *vcpu)
1492 {
1493         u32 eb;
1494
1495         eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR) |
1496              (1u << NM_VECTOR) | (1u << DB_VECTOR);
1497         if ((vcpu->guest_debug &
1498              (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)) ==
1499             (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP))
1500                 eb |= 1u << BP_VECTOR;
1501         if (to_vmx(vcpu)->rmode.vm86_active)
1502                 eb = ~0;
1503         if (enable_ept)
1504                 eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */
1505         if (vcpu->fpu_active)
1506                 eb &= ~(1u << NM_VECTOR);
1507
1508         /* When we are running a nested L2 guest and L1 specified for it a
1509          * certain exception bitmap, we must trap the same exceptions and pass
1510          * them to L1. When running L2, we will only handle the exceptions
1511          * specified above if L1 did not want them.
1512          */
1513         if (is_guest_mode(vcpu))
1514                 eb |= get_vmcs12(vcpu)->exception_bitmap;
1515
1516         vmcs_write32(EXCEPTION_BITMAP, eb);
1517 }
1518
1519 static void clear_atomic_switch_msr_special(struct vcpu_vmx *vmx,
1520                 unsigned long entry, unsigned long exit)
1521 {
1522         vm_entry_controls_clearbit(vmx, entry);
1523         vm_exit_controls_clearbit(vmx, exit);
1524 }
1525
1526 static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr)
1527 {
1528         unsigned i;
1529         struct msr_autoload *m = &vmx->msr_autoload;
1530
1531         switch (msr) {
1532         case MSR_EFER:
1533                 if (cpu_has_load_ia32_efer) {
1534                         clear_atomic_switch_msr_special(vmx,
1535                                         VM_ENTRY_LOAD_IA32_EFER,
1536                                         VM_EXIT_LOAD_IA32_EFER);
1537                         return;
1538                 }
1539                 break;
1540         case MSR_CORE_PERF_GLOBAL_CTRL:
1541                 if (cpu_has_load_perf_global_ctrl) {
1542                         clear_atomic_switch_msr_special(vmx,
1543                                         VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL,
1544                                         VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL);
1545                         return;
1546                 }
1547                 break;
1548         }
1549
1550         for (i = 0; i < m->nr; ++i)
1551                 if (m->guest[i].index == msr)
1552                         break;
1553
1554         if (i == m->nr)
1555                 return;
1556         --m->nr;
1557         m->guest[i] = m->guest[m->nr];
1558         m->host[i] = m->host[m->nr];
1559         vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr);
1560         vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr);
1561 }
1562
1563 static void add_atomic_switch_msr_special(struct vcpu_vmx *vmx,
1564                 unsigned long entry, unsigned long exit,
1565                 unsigned long guest_val_vmcs, unsigned long host_val_vmcs,
1566                 u64 guest_val, u64 host_val)
1567 {
1568         vmcs_write64(guest_val_vmcs, guest_val);
1569         vmcs_write64(host_val_vmcs, host_val);
1570         vm_entry_controls_setbit(vmx, entry);
1571         vm_exit_controls_setbit(vmx, exit);
1572 }
1573
1574 static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
1575                                   u64 guest_val, u64 host_val)
1576 {
1577         unsigned i;
1578         struct msr_autoload *m = &vmx->msr_autoload;
1579
1580         switch (msr) {
1581         case MSR_EFER:
1582                 if (cpu_has_load_ia32_efer) {
1583                         add_atomic_switch_msr_special(vmx,
1584                                         VM_ENTRY_LOAD_IA32_EFER,
1585                                         VM_EXIT_LOAD_IA32_EFER,
1586                                         GUEST_IA32_EFER,
1587                                         HOST_IA32_EFER,
1588                                         guest_val, host_val);
1589                         return;
1590                 }
1591                 break;
1592         case MSR_CORE_PERF_GLOBAL_CTRL:
1593                 if (cpu_has_load_perf_global_ctrl) {
1594                         add_atomic_switch_msr_special(vmx,
1595                                         VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL,
1596                                         VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL,
1597                                         GUEST_IA32_PERF_GLOBAL_CTRL,
1598                                         HOST_IA32_PERF_GLOBAL_CTRL,
1599                                         guest_val, host_val);
1600                         return;
1601                 }
1602                 break;
1603         }
1604
1605         for (i = 0; i < m->nr; ++i)
1606                 if (m->guest[i].index == msr)
1607                         break;
1608
1609         if (i == NR_AUTOLOAD_MSRS) {
1610                 printk_once(KERN_WARNING "Not enough msr switch entries. "
1611                                 "Can't add msr %x\n", msr);
1612                 return;
1613         } else if (i == m->nr) {
1614                 ++m->nr;
1615                 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr);
1616                 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr);
1617         }
1618
1619         m->guest[i].index = msr;
1620         m->guest[i].value = guest_val;
1621         m->host[i].index = msr;
1622         m->host[i].value = host_val;
1623 }
1624
1625 static void reload_tss(void)
1626 {
1627         /*
1628          * VT restores TR but not its size.  Useless.
1629          */
1630         struct desc_ptr *gdt = this_cpu_ptr(&host_gdt);
1631         struct desc_struct *descs;
1632
1633         descs = (void *)gdt->address;
1634         descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
1635         load_TR_desc();
1636 }
1637
1638 static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
1639 {
1640         u64 guest_efer;
1641         u64 ignore_bits;
1642
1643         guest_efer = vmx->vcpu.arch.efer;
1644
1645         /*
1646          * NX is emulated; LMA and LME handled by hardware; SCE meaningless
1647          * outside long mode
1648          */
1649         ignore_bits = EFER_NX | EFER_SCE;
1650 #ifdef CONFIG_X86_64
1651         ignore_bits |= EFER_LMA | EFER_LME;
1652         /* SCE is meaningful only in long mode on Intel */
1653         if (guest_efer & EFER_LMA)
1654                 ignore_bits &= ~(u64)EFER_SCE;
1655 #endif
1656         guest_efer &= ~ignore_bits;
1657         guest_efer |= host_efer & ignore_bits;
1658         vmx->guest_msrs[efer_offset].data = guest_efer;
1659         vmx->guest_msrs[efer_offset].mask = ~ignore_bits;
1660
1661         clear_atomic_switch_msr(vmx, MSR_EFER);
1662         /* On ept, can't emulate nx, and must switch nx atomically */
1663         if (enable_ept && ((vmx->vcpu.arch.efer ^ host_efer) & EFER_NX)) {
1664                 guest_efer = vmx->vcpu.arch.efer;
1665                 if (!(guest_efer & EFER_LMA))
1666                         guest_efer &= ~EFER_LME;
1667                 add_atomic_switch_msr(vmx, MSR_EFER, guest_efer, host_efer);
1668                 return false;
1669         }
1670
1671         return true;
1672 }
1673
1674 static unsigned long segment_base(u16 selector)
1675 {
1676         struct desc_ptr *gdt = this_cpu_ptr(&host_gdt);
1677         struct desc_struct *d;
1678         unsigned long table_base;
1679         unsigned long v;
1680
1681         if (!(selector & ~3))
1682                 return 0;
1683
1684         table_base = gdt->address;
1685
1686         if (selector & 4) {           /* from ldt */
1687                 u16 ldt_selector = kvm_read_ldt();
1688
1689                 if (!(ldt_selector & ~3))
1690                         return 0;
1691
1692                 table_base = segment_base(ldt_selector);
1693         }
1694         d = (struct desc_struct *)(table_base + (selector & ~7));
1695         v = get_desc_base(d);
1696 #ifdef CONFIG_X86_64
1697        if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
1698                v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32;
1699 #endif
1700         return v;
1701 }
1702
1703 static inline unsigned long kvm_read_tr_base(void)
1704 {
1705         u16 tr;
1706         asm("str %0" : "=g"(tr));
1707         return segment_base(tr);
1708 }
1709
1710 static void vmx_save_host_state(struct kvm_vcpu *vcpu)
1711 {
1712         struct vcpu_vmx *vmx = to_vmx(vcpu);
1713         int i;
1714
1715         if (vmx->host_state.loaded)
1716                 return;
1717
1718         vmx->host_state.loaded = 1;
1719         /*
1720          * Set host fs and gs selectors.  Unfortunately, 22.2.3 does not
1721          * allow segment selectors with cpl > 0 or ti == 1.
1722          */
1723         vmx->host_state.ldt_sel = kvm_read_ldt();
1724         vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;
1725         savesegment(fs, vmx->host_state.fs_sel);
1726         if (!(vmx->host_state.fs_sel & 7)) {
1727                 vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
1728                 vmx->host_state.fs_reload_needed = 0;
1729         } else {
1730                 vmcs_write16(HOST_FS_SELECTOR, 0);
1731                 vmx->host_state.fs_reload_needed = 1;
1732         }
1733         savesegment(gs, vmx->host_state.gs_sel);
1734         if (!(vmx->host_state.gs_sel & 7))
1735                 vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel);
1736         else {
1737                 vmcs_write16(HOST_GS_SELECTOR, 0);
1738                 vmx->host_state.gs_ldt_reload_needed = 1;
1739         }
1740
1741 #ifdef CONFIG_X86_64
1742         savesegment(ds, vmx->host_state.ds_sel);
1743         savesegment(es, vmx->host_state.es_sel);
1744 #endif
1745
1746 #ifdef CONFIG_X86_64
1747         vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
1748         vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
1749 #else
1750         vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
1751         vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
1752 #endif
1753
1754 #ifdef CONFIG_X86_64
1755         rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
1756         if (is_long_mode(&vmx->vcpu))
1757                 wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
1758 #endif
1759         if (boot_cpu_has(X86_FEATURE_MPX))
1760                 rdmsrl(MSR_IA32_BNDCFGS, vmx->host_state.msr_host_bndcfgs);
1761         for (i = 0; i < vmx->save_nmsrs; ++i)
1762                 kvm_set_shared_msr(vmx->guest_msrs[i].index,
1763                                    vmx->guest_msrs[i].data,
1764                                    vmx->guest_msrs[i].mask);
1765 }
1766
1767 static void __vmx_load_host_state(struct vcpu_vmx *vmx)
1768 {
1769         if (!vmx->host_state.loaded)
1770                 return;
1771
1772         ++vmx->vcpu.stat.host_state_reload;
1773         vmx->host_state.loaded = 0;
1774 #ifdef CONFIG_X86_64
1775         if (is_long_mode(&vmx->vcpu))
1776                 rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
1777 #endif
1778         if (vmx->host_state.gs_ldt_reload_needed) {
1779                 kvm_load_ldt(vmx->host_state.ldt_sel);
1780 #ifdef CONFIG_X86_64
1781                 load_gs_index(vmx->host_state.gs_sel);
1782 #else
1783                 loadsegment(gs, vmx->host_state.gs_sel);
1784 #endif
1785         }
1786         if (vmx->host_state.fs_reload_needed)
1787                 loadsegment(fs, vmx->host_state.fs_sel);
1788 #ifdef CONFIG_X86_64
1789         if (unlikely(vmx->host_state.ds_sel | vmx->host_state.es_sel)) {
1790                 loadsegment(ds, vmx->host_state.ds_sel);
1791                 loadsegment(es, vmx->host_state.es_sel);
1792         }
1793 #endif
1794         reload_tss();
1795 #ifdef CONFIG_X86_64
1796         wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
1797 #endif
1798         if (vmx->host_state.msr_host_bndcfgs)
1799                 wrmsrl(MSR_IA32_BNDCFGS, vmx->host_state.msr_host_bndcfgs);
1800         /*
1801          * If the FPU is not active (through the host task or
1802          * the guest vcpu), then restore the cr0.TS bit.
1803          */
1804         if (!user_has_fpu() && !vmx->vcpu.guest_fpu_loaded)
1805                 stts();
1806         load_gdt(this_cpu_ptr(&host_gdt));
1807 }
1808
1809 static void vmx_load_host_state(struct vcpu_vmx *vmx)
1810 {
1811         preempt_disable();
1812         __vmx_load_host_state(vmx);
1813         preempt_enable();
1814 }
1815
1816 /*
1817  * Switches to specified vcpu, until a matching vcpu_put(), but assumes
1818  * vcpu mutex is already taken.
1819  */
1820 static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
1821 {
1822         struct vcpu_vmx *vmx = to_vmx(vcpu);
1823         u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
1824
1825         if (!vmm_exclusive)
1826                 kvm_cpu_vmxon(phys_addr);
1827         else if (vmx->loaded_vmcs->cpu != cpu)
1828                 loaded_vmcs_clear(vmx->loaded_vmcs);
1829
1830         if (per_cpu(current_vmcs, cpu) != vmx->loaded_vmcs->vmcs) {
1831                 per_cpu(current_vmcs, cpu) = vmx->loaded_vmcs->vmcs;
1832                 vmcs_load(vmx->loaded_vmcs->vmcs);
1833         }
1834
1835         if (vmx->loaded_vmcs->cpu != cpu) {
1836                 struct desc_ptr *gdt = this_cpu_ptr(&host_gdt);
1837                 unsigned long sysenter_esp;
1838
1839                 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1840                 local_irq_disable();
1841                 crash_disable_local_vmclear(cpu);
1842
1843                 /*
1844                  * Read loaded_vmcs->cpu should be before fetching
1845                  * loaded_vmcs->loaded_vmcss_on_cpu_link.
1846                  * See the comments in __loaded_vmcs_clear().
1847                  */
1848                 smp_rmb();
1849
1850                 list_add(&vmx->loaded_vmcs->loaded_vmcss_on_cpu_link,
1851                          &per_cpu(loaded_vmcss_on_cpu, cpu));
1852                 crash_enable_local_vmclear(cpu);
1853                 local_irq_enable();
1854
1855                 /*
1856                  * Linux uses per-cpu TSS and GDT, so set these when switching
1857                  * processors.
1858                  */
1859                 vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */
1860                 vmcs_writel(HOST_GDTR_BASE, gdt->address);   /* 22.2.4 */
1861
1862                 rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
1863                 vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
1864                 vmx->loaded_vmcs->cpu = cpu;
1865         }
1866 }
1867
1868 static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
1869 {
1870         __vmx_load_host_state(to_vmx(vcpu));
1871         if (!vmm_exclusive) {
1872                 __loaded_vmcs_clear(to_vmx(vcpu)->loaded_vmcs);
1873                 vcpu->cpu = -1;
1874                 kvm_cpu_vmxoff();
1875         }
1876 }
1877
1878 static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
1879 {
1880         ulong cr0;
1881
1882         if (vcpu->fpu_active)
1883                 return;
1884         vcpu->fpu_active = 1;
1885         cr0 = vmcs_readl(GUEST_CR0);
1886         cr0 &= ~(X86_CR0_TS | X86_CR0_MP);
1887         cr0 |= kvm_read_cr0_bits(vcpu, X86_CR0_TS | X86_CR0_MP);
1888         vmcs_writel(GUEST_CR0, cr0);
1889         update_exception_bitmap(vcpu);
1890         vcpu->arch.cr0_guest_owned_bits = X86_CR0_TS;
1891         if (is_guest_mode(vcpu))
1892                 vcpu->arch.cr0_guest_owned_bits &=
1893                         ~get_vmcs12(vcpu)->cr0_guest_host_mask;
1894         vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
1895 }
1896
1897 static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu);
1898
1899 /*
1900  * Return the cr0 value that a nested guest would read. This is a combination
1901  * of the real cr0 used to run the guest (guest_cr0), and the bits shadowed by
1902  * its hypervisor (cr0_read_shadow).
1903  */
1904 static inline unsigned long nested_read_cr0(struct vmcs12 *fields)
1905 {
1906         return (fields->guest_cr0 & ~fields->cr0_guest_host_mask) |
1907                 (fields->cr0_read_shadow & fields->cr0_guest_host_mask);
1908 }
1909 static inline unsigned long nested_read_cr4(struct vmcs12 *fields)
1910 {
1911         return (fields->guest_cr4 & ~fields->cr4_guest_host_mask) |
1912                 (fields->cr4_read_shadow & fields->cr4_guest_host_mask);
1913 }
1914
1915 static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
1916 {
1917         /* Note that there is no vcpu->fpu_active = 0 here. The caller must
1918          * set this *before* calling this function.
1919          */
1920         vmx_decache_cr0_guest_bits(vcpu);
1921         vmcs_set_bits(GUEST_CR0, X86_CR0_TS | X86_CR0_MP);
1922         update_exception_bitmap(vcpu);
1923         vcpu->arch.cr0_guest_owned_bits = 0;
1924         vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
1925         if (is_guest_mode(vcpu)) {
1926                 /*
1927                  * L1's specified read shadow might not contain the TS bit,
1928                  * so now that we turned on shadowing of this bit, we need to
1929                  * set this bit of the shadow. Like in nested_vmx_run we need
1930                  * nested_read_cr0(vmcs12), but vmcs12->guest_cr0 is not yet
1931                  * up-to-date here because we just decached cr0.TS (and we'll
1932                  * only update vmcs12->guest_cr0 on nested exit).
1933                  */
1934                 struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
1935                 vmcs12->guest_cr0 = (vmcs12->guest_cr0 & ~X86_CR0_TS) |
1936                         (vcpu->arch.cr0 & X86_CR0_TS);
1937                 vmcs_writel(CR0_READ_SHADOW, nested_read_cr0(vmcs12));
1938         } else
1939                 vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
1940 }
1941
1942 static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
1943 {
1944         unsigned long rflags, save_rflags;
1945
1946         if (!test_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail)) {
1947                 __set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail);
1948                 rflags = vmcs_readl(GUEST_RFLAGS);
1949                 if (to_vmx(vcpu)->rmode.vm86_active) {
1950                         rflags &= RMODE_GUEST_OWNED_EFLAGS_BITS;
1951                         save_rflags = to_vmx(vcpu)->rmode.save_rflags;
1952                         rflags |= save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS;
1953                 }
1954                 to_vmx(vcpu)->rflags = rflags;
1955         }
1956         return to_vmx(vcpu)->rflags;
1957 }
1958
1959 static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
1960 {
1961         __set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail);
1962         to_vmx(vcpu)->rflags = rflags;
1963         if (to_vmx(vcpu)->rmode.vm86_active) {
1964                 to_vmx(vcpu)->rmode.save_rflags = rflags;
1965                 rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
1966         }
1967         vmcs_writel(GUEST_RFLAGS, rflags);
1968 }
1969
1970 static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu)
1971 {
1972         u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
1973         int ret = 0;
1974
1975         if (interruptibility & GUEST_INTR_STATE_STI)
1976                 ret |= KVM_X86_SHADOW_INT_STI;
1977         if (interruptibility & GUEST_INTR_STATE_MOV_SS)
1978                 ret |= KVM_X86_SHADOW_INT_MOV_SS;
1979
1980         return ret;
1981 }
1982
1983 static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
1984 {
1985         u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
1986         u32 interruptibility = interruptibility_old;
1987
1988         interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS);
1989
1990         if (mask & KVM_X86_SHADOW_INT_MOV_SS)
1991                 interruptibility |= GUEST_INTR_STATE_MOV_SS;
1992         else if (mask & KVM_X86_SHADOW_INT_STI)
1993                 interruptibility |= GUEST_INTR_STATE_STI;
1994
1995         if ((interruptibility != interruptibility_old))
1996                 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility);
1997 }
1998
1999 static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
2000 {
2001         unsigned long rip;
2002
2003         rip = kvm_rip_read(vcpu);
2004         rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
2005         kvm_rip_write(vcpu, rip);
2006
2007         /* skipping an emulated instruction also counts */
2008         vmx_set_interrupt_shadow(vcpu, 0);
2009 }
2010
2011 /*
2012  * KVM wants to inject page-faults which it got to the guest. This function
2013  * checks whether in a nested guest, we need to inject them to L1 or L2.
2014  */
2015 static int nested_vmx_check_exception(struct kvm_vcpu *vcpu, unsigned nr)
2016 {
2017         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
2018
2019         if (!(vmcs12->exception_bitmap & (1u << nr)))
2020                 return 0;
2021
2022         nested_vmx_vmexit(vcpu, to_vmx(vcpu)->exit_reason,
2023                           vmcs_read32(VM_EXIT_INTR_INFO),
2024                           vmcs_readl(EXIT_QUALIFICATION));
2025         return 1;
2026 }
2027
2028 static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
2029                                 bool has_error_code, u32 error_code,
2030                                 bool reinject)
2031 {
2032         struct vcpu_vmx *vmx = to_vmx(vcpu);
2033         u32 intr_info = nr | INTR_INFO_VALID_MASK;
2034
2035         if (!reinject && is_guest_mode(vcpu) &&
2036             nested_vmx_check_exception(vcpu, nr))
2037                 return;
2038
2039         if (has_error_code) {
2040                 vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
2041                 intr_info |= INTR_INFO_DELIVER_CODE_MASK;
2042         }
2043
2044         if (vmx->rmode.vm86_active) {
2045                 int inc_eip = 0;
2046                 if (kvm_exception_is_soft(nr))
2047                         inc_eip = vcpu->arch.event_exit_inst_len;
2048                 if (kvm_inject_realmode_interrupt(vcpu, nr, inc_eip) != EMULATE_DONE)
2049                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
2050                 return;
2051         }
2052
2053         if (kvm_exception_is_soft(nr)) {
2054                 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
2055                              vmx->vcpu.arch.event_exit_inst_len);
2056                 intr_info |= INTR_TYPE_SOFT_EXCEPTION;
2057         } else
2058                 intr_info |= INTR_TYPE_HARD_EXCEPTION;
2059
2060         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
2061 }
2062
2063 static bool vmx_rdtscp_supported(void)
2064 {
2065         return cpu_has_vmx_rdtscp();
2066 }
2067
2068 static bool vmx_invpcid_supported(void)
2069 {
2070         return cpu_has_vmx_invpcid() && enable_ept;
2071 }
2072
2073 /*
2074  * Swap MSR entry in host/guest MSR entry array.
2075  */
2076 static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
2077 {
2078         struct shared_msr_entry tmp;
2079
2080         tmp = vmx->guest_msrs[to];
2081         vmx->guest_msrs[to] = vmx->guest_msrs[from];
2082         vmx->guest_msrs[from] = tmp;
2083 }
2084
2085 static void vmx_set_msr_bitmap(struct kvm_vcpu *vcpu)
2086 {
2087         unsigned long *msr_bitmap;
2088
2089         if (irqchip_in_kernel(vcpu->kvm) && apic_x2apic_mode(vcpu->arch.apic)) {
2090                 if (is_long_mode(vcpu))
2091                         msr_bitmap = vmx_msr_bitmap_longmode_x2apic;
2092                 else
2093                         msr_bitmap = vmx_msr_bitmap_legacy_x2apic;
2094         } else {
2095                 if (is_long_mode(vcpu))
2096                         msr_bitmap = vmx_msr_bitmap_longmode;
2097                 else
2098                         msr_bitmap = vmx_msr_bitmap_legacy;
2099         }
2100
2101         vmcs_write64(MSR_BITMAP, __pa(msr_bitmap));
2102 }
2103
2104 /*
2105  * Set up the vmcs to automatically save and restore system
2106  * msrs.  Don't touch the 64-bit msrs if the guest is in legacy
2107  * mode, as fiddling with msrs is very expensive.
2108  */
2109 static void setup_msrs(struct vcpu_vmx *vmx)
2110 {
2111         int save_nmsrs, index;
2112
2113         save_nmsrs = 0;
2114 #ifdef CONFIG_X86_64
2115         if (is_long_mode(&vmx->vcpu)) {
2116                 index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
2117                 if (index >= 0)
2118                         move_msr_up(vmx, index, save_nmsrs++);
2119                 index = __find_msr_index(vmx, MSR_LSTAR);
2120                 if (index >= 0)
2121                         move_msr_up(vmx, index, save_nmsrs++);
2122                 index = __find_msr_index(vmx, MSR_CSTAR);
2123                 if (index >= 0)
2124                         move_msr_up(vmx, index, save_nmsrs++);
2125                 index = __find_msr_index(vmx, MSR_TSC_AUX);
2126                 if (index >= 0 && vmx->rdtscp_enabled)
2127                         move_msr_up(vmx, index, save_nmsrs++);
2128                 /*
2129                  * MSR_STAR is only needed on long mode guests, and only
2130                  * if efer.sce is enabled.
2131                  */
2132                 index = __find_msr_index(vmx, MSR_STAR);
2133                 if ((index >= 0) && (vmx->vcpu.arch.efer & EFER_SCE))
2134                         move_msr_up(vmx, index, save_nmsrs++);
2135         }
2136 #endif
2137         index = __find_msr_index(vmx, MSR_EFER);
2138         if (index >= 0 && update_transition_efer(vmx, index))
2139                 move_msr_up(vmx, index, save_nmsrs++);
2140
2141         vmx->save_nmsrs = save_nmsrs;
2142
2143         if (cpu_has_vmx_msr_bitmap())
2144                 vmx_set_msr_bitmap(&vmx->vcpu);
2145 }
2146
2147 /*
2148  * reads and returns guest's timestamp counter "register"
2149  * guest_tsc = host_tsc + tsc_offset    -- 21.3
2150  */
2151 static u64 guest_read_tsc(void)
2152 {
2153         u64 host_tsc, tsc_offset;
2154
2155         rdtscll(host_tsc);
2156         tsc_offset = vmcs_read64(TSC_OFFSET);
2157         return host_tsc + tsc_offset;
2158 }
2159
2160 /*
2161  * Like guest_read_tsc, but always returns L1's notion of the timestamp
2162  * counter, even if a nested guest (L2) is currently running.
2163  */
2164 static u64 vmx_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc)
2165 {
2166         u64 tsc_offset;
2167
2168         tsc_offset = is_guest_mode(vcpu) ?
2169                 to_vmx(vcpu)->nested.vmcs01_tsc_offset :
2170                 vmcs_read64(TSC_OFFSET);
2171         return host_tsc + tsc_offset;
2172 }
2173
2174 /*
2175  * Engage any workarounds for mis-matched TSC rates.  Currently limited to
2176  * software catchup for faster rates on slower CPUs.
2177  */
2178 static void vmx_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale)
2179 {
2180         if (!scale)
2181                 return;
2182
2183         if (user_tsc_khz > tsc_khz) {
2184                 vcpu->arch.tsc_catchup = 1;
2185                 vcpu->arch.tsc_always_catchup = 1;
2186         } else
2187                 WARN(1, "user requested TSC rate below hardware speed\n");
2188 }
2189
2190 static u64 vmx_read_tsc_offset(struct kvm_vcpu *vcpu)
2191 {
2192         return vmcs_read64(TSC_OFFSET);
2193 }
2194
2195 /*
2196  * writes 'offset' into guest's timestamp counter offset register
2197  */
2198 static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
2199 {
2200         if (is_guest_mode(vcpu)) {
2201                 /*
2202                  * We're here if L1 chose not to trap WRMSR to TSC. According
2203                  * to the spec, this should set L1's TSC; The offset that L1
2204                  * set for L2 remains unchanged, and still needs to be added
2205                  * to the newly set TSC to get L2's TSC.
2206                  */
2207                 struct vmcs12 *vmcs12;
2208                 to_vmx(vcpu)->nested.vmcs01_tsc_offset = offset;
2209                 /* recalculate vmcs02.TSC_OFFSET: */
2210                 vmcs12 = get_vmcs12(vcpu);
2211                 vmcs_write64(TSC_OFFSET, offset +
2212                         (nested_cpu_has(vmcs12, CPU_BASED_USE_TSC_OFFSETING) ?
2213                          vmcs12->tsc_offset : 0));
2214         } else {
2215                 trace_kvm_write_tsc_offset(vcpu->vcpu_id,
2216                                            vmcs_read64(TSC_OFFSET), offset);
2217                 vmcs_write64(TSC_OFFSET, offset);
2218         }
2219 }
2220
2221 static void vmx_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment, bool host)
2222 {
2223         u64 offset = vmcs_read64(TSC_OFFSET);
2224
2225         vmcs_write64(TSC_OFFSET, offset + adjustment);
2226         if (is_guest_mode(vcpu)) {
2227                 /* Even when running L2, the adjustment needs to apply to L1 */
2228                 to_vmx(vcpu)->nested.vmcs01_tsc_offset += adjustment;
2229         } else
2230                 trace_kvm_write_tsc_offset(vcpu->vcpu_id, offset,
2231                                            offset + adjustment);
2232 }
2233
2234 static u64 vmx_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc)
2235 {
2236         return target_tsc - native_read_tsc();
2237 }
2238
2239 static bool guest_cpuid_has_vmx(struct kvm_vcpu *vcpu)
2240 {
2241         struct kvm_cpuid_entry2 *best = kvm_find_cpuid_entry(vcpu, 1, 0);
2242         return best && (best->ecx & (1 << (X86_FEATURE_VMX & 31)));
2243 }
2244
2245 /*
2246  * nested_vmx_allowed() checks whether a guest should be allowed to use VMX
2247  * instructions and MSRs (i.e., nested VMX). Nested VMX is disabled for
2248  * all guests if the "nested" module option is off, and can also be disabled
2249  * for a single guest by disabling its VMX cpuid bit.
2250  */
2251 static inline bool nested_vmx_allowed(struct kvm_vcpu *vcpu)
2252 {
2253         return nested && guest_cpuid_has_vmx(vcpu);
2254 }
2255
2256 /*
2257  * nested_vmx_setup_ctls_msrs() sets up variables containing the values to be
2258  * returned for the various VMX controls MSRs when nested VMX is enabled.
2259  * The same values should also be used to verify that vmcs12 control fields are
2260  * valid during nested entry from L1 to L2.
2261  * Each of these control msrs has a low and high 32-bit half: A low bit is on
2262  * if the corresponding bit in the (32-bit) control field *must* be on, and a
2263  * bit in the high half is on if the corresponding bit in the control field
2264  * may be on. See also vmx_control_verify().
2265  * TODO: allow these variables to be modified (downgraded) by module options
2266  * or other means.
2267  */
2268 static u32 nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high;
2269 static u32 nested_vmx_true_procbased_ctls_low;
2270 static u32 nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high;
2271 static u32 nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high;
2272 static u32 nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high;
2273 static u32 nested_vmx_true_exit_ctls_low;
2274 static u32 nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high;
2275 static u32 nested_vmx_true_entry_ctls_low;
2276 static u32 nested_vmx_misc_low, nested_vmx_misc_high;
2277 static u32 nested_vmx_ept_caps;
2278 static __init void nested_vmx_setup_ctls_msrs(void)
2279 {
2280         /*
2281          * Note that as a general rule, the high half of the MSRs (bits in
2282          * the control fields which may be 1) should be initialized by the
2283          * intersection of the underlying hardware's MSR (i.e., features which
2284          * can be supported) and the list of features we want to expose -
2285          * because they are known to be properly supported in our code.
2286          * Also, usually, the low half of the MSRs (bits which must be 1) can
2287          * be set to 0, meaning that L1 may turn off any of these bits. The
2288          * reason is that if one of these bits is necessary, it will appear
2289          * in vmcs01 and prepare_vmcs02, when it bitwise-or's the control
2290          * fields of vmcs01 and vmcs02, will turn these bits off - and
2291          * nested_vmx_exit_handled() will not pass related exits to L1.
2292          * These rules have exceptions below.
2293          */
2294
2295         /* pin-based controls */
2296         rdmsr(MSR_IA32_VMX_PINBASED_CTLS,
2297               nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high);
2298         nested_vmx_pinbased_ctls_low |= PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
2299         nested_vmx_pinbased_ctls_high &= PIN_BASED_EXT_INTR_MASK |
2300                 PIN_BASED_NMI_EXITING | PIN_BASED_VIRTUAL_NMIS;
2301         nested_vmx_pinbased_ctls_high |= PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR |
2302                 PIN_BASED_VMX_PREEMPTION_TIMER;
2303
2304         /* exit controls */
2305         rdmsr(MSR_IA32_VMX_EXIT_CTLS,
2306                 nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high);
2307         nested_vmx_exit_ctls_low = VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR;
2308
2309         nested_vmx_exit_ctls_high &=
2310 #ifdef CONFIG_X86_64
2311                 VM_EXIT_HOST_ADDR_SPACE_SIZE |
2312 #endif
2313                 VM_EXIT_LOAD_IA32_PAT | VM_EXIT_SAVE_IA32_PAT;
2314         nested_vmx_exit_ctls_high |= VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR |
2315                 VM_EXIT_LOAD_IA32_EFER | VM_EXIT_SAVE_IA32_EFER |
2316                 VM_EXIT_SAVE_VMX_PREEMPTION_TIMER | VM_EXIT_ACK_INTR_ON_EXIT;
2317
2318         if (vmx_mpx_supported())
2319                 nested_vmx_exit_ctls_high |= VM_EXIT_CLEAR_BNDCFGS;
2320
2321         /* We support free control of debug control saving. */
2322         nested_vmx_true_exit_ctls_low = nested_vmx_exit_ctls_low &
2323                 ~VM_EXIT_SAVE_DEBUG_CONTROLS;
2324
2325         /* entry controls */
2326         rdmsr(MSR_IA32_VMX_ENTRY_CTLS,
2327                 nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high);
2328         nested_vmx_entry_ctls_low = VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR;
2329         nested_vmx_entry_ctls_high &=
2330 #ifdef CONFIG_X86_64
2331                 VM_ENTRY_IA32E_MODE |
2332 #endif
2333                 VM_ENTRY_LOAD_IA32_PAT;
2334         nested_vmx_entry_ctls_high |= (VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR |
2335                                        VM_ENTRY_LOAD_IA32_EFER);
2336         if (vmx_mpx_supported())
2337                 nested_vmx_entry_ctls_high |= VM_ENTRY_LOAD_BNDCFGS;
2338
2339         /* We support free control of debug control loading. */
2340         nested_vmx_true_entry_ctls_low = nested_vmx_entry_ctls_low &
2341                 ~VM_ENTRY_LOAD_DEBUG_CONTROLS;
2342
2343         /* cpu-based controls */
2344         rdmsr(MSR_IA32_VMX_PROCBASED_CTLS,
2345                 nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high);
2346         nested_vmx_procbased_ctls_low = CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
2347         nested_vmx_procbased_ctls_high &=
2348                 CPU_BASED_VIRTUAL_INTR_PENDING |
2349                 CPU_BASED_VIRTUAL_NMI_PENDING | CPU_BASED_USE_TSC_OFFSETING |
2350                 CPU_BASED_HLT_EXITING | CPU_BASED_INVLPG_EXITING |
2351                 CPU_BASED_MWAIT_EXITING | CPU_BASED_CR3_LOAD_EXITING |
2352                 CPU_BASED_CR3_STORE_EXITING |
2353 #ifdef CONFIG_X86_64
2354                 CPU_BASED_CR8_LOAD_EXITING | CPU_BASED_CR8_STORE_EXITING |
2355 #endif
2356                 CPU_BASED_MOV_DR_EXITING | CPU_BASED_UNCOND_IO_EXITING |
2357                 CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MONITOR_EXITING |
2358                 CPU_BASED_RDPMC_EXITING | CPU_BASED_RDTSC_EXITING |
2359                 CPU_BASED_PAUSE_EXITING | CPU_BASED_TPR_SHADOW |
2360                 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
2361         /*
2362          * We can allow some features even when not supported by the
2363          * hardware. For example, L1 can specify an MSR bitmap - and we
2364          * can use it to avoid exits to L1 - even when L0 runs L2
2365          * without MSR bitmaps.
2366          */
2367         nested_vmx_procbased_ctls_high |= CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR |
2368                 CPU_BASED_USE_MSR_BITMAPS;
2369
2370         /* We support free control of CR3 access interception. */
2371         nested_vmx_true_procbased_ctls_low = nested_vmx_procbased_ctls_low &
2372                 ~(CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING);
2373
2374         /* secondary cpu-based controls */
2375         rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
2376                 nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high);
2377         nested_vmx_secondary_ctls_low = 0;
2378         nested_vmx_secondary_ctls_high &=
2379                 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
2380                 SECONDARY_EXEC_UNRESTRICTED_GUEST |
2381                 SECONDARY_EXEC_WBINVD_EXITING;
2382
2383         if (enable_ept) {
2384                 /* nested EPT: emulate EPT also to L1 */
2385                 nested_vmx_secondary_ctls_high |= SECONDARY_EXEC_ENABLE_EPT;
2386                 nested_vmx_ept_caps = VMX_EPT_PAGE_WALK_4_BIT |
2387                          VMX_EPTP_WB_BIT | VMX_EPT_2MB_PAGE_BIT |
2388                          VMX_EPT_INVEPT_BIT;
2389                 nested_vmx_ept_caps &= vmx_capability.ept;
2390                 /*
2391                  * For nested guests, we don't do anything specific
2392                  * for single context invalidation. Hence, only advertise
2393                  * support for global context invalidation.
2394                  */
2395                 nested_vmx_ept_caps |= VMX_EPT_EXTENT_GLOBAL_BIT;
2396         } else
2397                 nested_vmx_ept_caps = 0;
2398
2399         /* miscellaneous data */
2400         rdmsr(MSR_IA32_VMX_MISC, nested_vmx_misc_low, nested_vmx_misc_high);
2401         nested_vmx_misc_low &= VMX_MISC_SAVE_EFER_LMA;
2402         nested_vmx_misc_low |= VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE |
2403                 VMX_MISC_ACTIVITY_HLT;
2404         nested_vmx_misc_high = 0;
2405 }
2406
2407 static inline bool vmx_control_verify(u32 control, u32 low, u32 high)
2408 {
2409         /*
2410          * Bits 0 in high must be 0, and bits 1 in low must be 1.
2411          */
2412         return ((control & high) | low) == control;
2413 }
2414
2415 static inline u64 vmx_control_msr(u32 low, u32 high)
2416 {
2417         return low | ((u64)high << 32);
2418 }
2419
2420 /* Returns 0 on success, non-0 otherwise. */
2421 static int vmx_get_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
2422 {
2423         switch (msr_index) {
2424         case MSR_IA32_VMX_BASIC:
2425                 /*
2426                  * This MSR reports some information about VMX support. We
2427                  * should return information about the VMX we emulate for the
2428                  * guest, and the VMCS structure we give it - not about the
2429                  * VMX support of the underlying hardware.
2430                  */
2431                 *pdata = VMCS12_REVISION | VMX_BASIC_TRUE_CTLS |
2432                            ((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) |
2433                            (VMX_BASIC_MEM_TYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT);
2434                 break;
2435         case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
2436         case MSR_IA32_VMX_PINBASED_CTLS:
2437                 *pdata = vmx_control_msr(nested_vmx_pinbased_ctls_low,
2438                                         nested_vmx_pinbased_ctls_high);
2439                 break;
2440         case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
2441                 *pdata = vmx_control_msr(nested_vmx_true_procbased_ctls_low,
2442                                         nested_vmx_procbased_ctls_high);
2443                 break;
2444         case MSR_IA32_VMX_PROCBASED_CTLS:
2445                 *pdata = vmx_control_msr(nested_vmx_procbased_ctls_low,
2446                                         nested_vmx_procbased_ctls_high);
2447                 break;
2448         case MSR_IA32_VMX_TRUE_EXIT_CTLS:
2449                 *pdata = vmx_control_msr(nested_vmx_true_exit_ctls_low,
2450                                         nested_vmx_exit_ctls_high);
2451                 break;
2452         case MSR_IA32_VMX_EXIT_CTLS:
2453                 *pdata = vmx_control_msr(nested_vmx_exit_ctls_low,
2454                                         nested_vmx_exit_ctls_high);
2455                 break;
2456         case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
2457                 *pdata = vmx_control_msr(nested_vmx_true_entry_ctls_low,
2458                                         nested_vmx_entry_ctls_high);
2459                 break;
2460         case MSR_IA32_VMX_ENTRY_CTLS:
2461                 *pdata = vmx_control_msr(nested_vmx_entry_ctls_low,
2462                                         nested_vmx_entry_ctls_high);
2463                 break;
2464         case MSR_IA32_VMX_MISC:
2465                 *pdata = vmx_control_msr(nested_vmx_misc_low,
2466                                          nested_vmx_misc_high);
2467                 break;
2468         /*
2469          * These MSRs specify bits which the guest must keep fixed (on or off)
2470          * while L1 is in VMXON mode (in L1's root mode, or running an L2).
2471          * We picked the standard core2 setting.
2472          */
2473 #define VMXON_CR0_ALWAYSON      (X86_CR0_PE | X86_CR0_PG | X86_CR0_NE)
2474 #define VMXON_CR4_ALWAYSON      X86_CR4_VMXE
2475         case MSR_IA32_VMX_CR0_FIXED0:
2476                 *pdata = VMXON_CR0_ALWAYSON;
2477                 break;
2478         case MSR_IA32_VMX_CR0_FIXED1:
2479                 *pdata = -1ULL;
2480                 break;
2481         case MSR_IA32_VMX_CR4_FIXED0:
2482                 *pdata = VMXON_CR4_ALWAYSON;
2483                 break;
2484         case MSR_IA32_VMX_CR4_FIXED1:
2485                 *pdata = -1ULL;
2486                 break;
2487         case MSR_IA32_VMX_VMCS_ENUM:
2488                 *pdata = 0x2e; /* highest index: VMX_PREEMPTION_TIMER_VALUE */
2489                 break;
2490         case MSR_IA32_VMX_PROCBASED_CTLS2:
2491                 *pdata = vmx_control_msr(nested_vmx_secondary_ctls_low,
2492                                         nested_vmx_secondary_ctls_high);
2493                 break;
2494         case MSR_IA32_VMX_EPT_VPID_CAP:
2495                 /* Currently, no nested vpid support */
2496                 *pdata = nested_vmx_ept_caps;
2497                 break;
2498         default:
2499                 return 1;
2500         }
2501
2502         return 0;
2503 }
2504
2505 /*
2506  * Reads an msr value (of 'msr_index') into 'pdata'.
2507  * Returns 0 on success, non-0 otherwise.
2508  * Assumes vcpu_load() was already called.
2509  */
2510 static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
2511 {
2512         u64 data;
2513         struct shared_msr_entry *msr;
2514
2515         if (!pdata) {
2516                 printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
2517                 return -EINVAL;
2518         }
2519
2520         switch (msr_index) {
2521 #ifdef CONFIG_X86_64
2522         case MSR_FS_BASE:
2523                 data = vmcs_readl(GUEST_FS_BASE);
2524                 break;
2525         case MSR_GS_BASE:
2526                 data = vmcs_readl(GUEST_GS_BASE);
2527                 break;
2528         case MSR_KERNEL_GS_BASE:
2529                 vmx_load_host_state(to_vmx(vcpu));
2530                 data = to_vmx(vcpu)->msr_guest_kernel_gs_base;
2531                 break;
2532 #endif
2533         case MSR_EFER:
2534                 return kvm_get_msr_common(vcpu, msr_index, pdata);
2535         case MSR_IA32_TSC:
2536                 data = guest_read_tsc();
2537                 break;
2538         case MSR_IA32_SYSENTER_CS:
2539                 data = vmcs_read32(GUEST_SYSENTER_CS);
2540                 break;
2541         case MSR_IA32_SYSENTER_EIP:
2542                 data = vmcs_readl(GUEST_SYSENTER_EIP);
2543                 break;
2544         case MSR_IA32_SYSENTER_ESP:
2545                 data = vmcs_readl(GUEST_SYSENTER_ESP);
2546                 break;
2547         case MSR_IA32_BNDCFGS:
2548                 if (!vmx_mpx_supported())
2549                         return 1;
2550                 data = vmcs_read64(GUEST_BNDCFGS);
2551                 break;
2552         case MSR_IA32_FEATURE_CONTROL:
2553                 if (!nested_vmx_allowed(vcpu))
2554                         return 1;
2555                 data = to_vmx(vcpu)->nested.msr_ia32_feature_control;
2556                 break;
2557         case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
2558                 if (!nested_vmx_allowed(vcpu))
2559                         return 1;
2560                 return vmx_get_vmx_msr(vcpu, msr_index, pdata);
2561         case MSR_TSC_AUX:
2562                 if (!to_vmx(vcpu)->rdtscp_enabled)
2563                         return 1;
2564                 /* Otherwise falls through */
2565         default:
2566                 msr = find_msr_entry(to_vmx(vcpu), msr_index);
2567                 if (msr) {
2568                         data = msr->data;
2569                         break;
2570                 }
2571                 return kvm_get_msr_common(vcpu, msr_index, pdata);
2572         }
2573
2574         *pdata = data;
2575         return 0;
2576 }
2577
2578 static void vmx_leave_nested(struct kvm_vcpu *vcpu);
2579
2580 /*
2581  * Writes msr value into into the appropriate "register".
2582  * Returns 0 on success, non-0 otherwise.
2583  * Assumes vcpu_load() was already called.
2584  */
2585 static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
2586 {
2587         struct vcpu_vmx *vmx = to_vmx(vcpu);
2588         struct shared_msr_entry *msr;
2589         int ret = 0;
2590         u32 msr_index = msr_info->index;
2591         u64 data = msr_info->data;
2592
2593         switch (msr_index) {
2594         case MSR_EFER:
2595                 ret = kvm_set_msr_common(vcpu, msr_info);
2596                 break;
2597 #ifdef CONFIG_X86_64
2598         case MSR_FS_BASE:
2599                 vmx_segment_cache_clear(vmx);
2600                 vmcs_writel(GUEST_FS_BASE, data);
2601                 break;
2602         case MSR_GS_BASE:
2603                 vmx_segment_cache_clear(vmx);
2604                 vmcs_writel(GUEST_GS_BASE, data);
2605                 break;
2606         case MSR_KERNEL_GS_BASE:
2607                 vmx_load_host_state(vmx);
2608                 vmx->msr_guest_kernel_gs_base = data;
2609                 break;
2610 #endif
2611         case MSR_IA32_SYSENTER_CS:
2612                 vmcs_write32(GUEST_SYSENTER_CS, data);
2613                 break;
2614         case MSR_IA32_SYSENTER_EIP:
2615                 vmcs_writel(GUEST_SYSENTER_EIP, data);
2616                 break;
2617         case MSR_IA32_SYSENTER_ESP:
2618                 vmcs_writel(GUEST_SYSENTER_ESP, data);
2619                 break;
2620         case MSR_IA32_BNDCFGS:
2621                 if (!vmx_mpx_supported())
2622                         return 1;
2623                 vmcs_write64(GUEST_BNDCFGS, data);
2624                 break;
2625         case MSR_IA32_TSC:
2626                 kvm_write_tsc(vcpu, msr_info);
2627                 break;
2628         case MSR_IA32_CR_PAT:
2629                 if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
2630                         if (!kvm_mtrr_valid(vcpu, MSR_IA32_CR_PAT, data))
2631                                 return 1;
2632                         vmcs_write64(GUEST_IA32_PAT, data);
2633                         vcpu->arch.pat = data;
2634                         break;
2635                 }
2636                 ret = kvm_set_msr_common(vcpu, msr_info);
2637                 break;
2638         case MSR_IA32_TSC_ADJUST:
2639                 ret = kvm_set_msr_common(vcpu, msr_info);
2640                 break;
2641         case MSR_IA32_FEATURE_CONTROL:
2642                 if (!nested_vmx_allowed(vcpu) ||
2643                     (to_vmx(vcpu)->nested.msr_ia32_feature_control &
2644                      FEATURE_CONTROL_LOCKED && !msr_info->host_initiated))
2645                         return 1;
2646                 vmx->nested.msr_ia32_feature_control = data;
2647                 if (msr_info->host_initiated && data == 0)
2648                         vmx_leave_nested(vcpu);
2649                 break;
2650         case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
2651                 return 1; /* they are read-only */
2652         case MSR_TSC_AUX:
2653                 if (!vmx->rdtscp_enabled)
2654                         return 1;
2655                 /* Check reserved bit, higher 32 bits should be zero */
2656                 if ((data >> 32) != 0)
2657                         return 1;
2658                 /* Otherwise falls through */
2659         default:
2660                 msr = find_msr_entry(vmx, msr_index);
2661                 if (msr) {
2662                         u64 old_msr_data = msr->data;
2663                         msr->data = data;
2664                         if (msr - vmx->guest_msrs < vmx->save_nmsrs) {
2665                                 preempt_disable();
2666                                 ret = kvm_set_shared_msr(msr->index, msr->data,
2667                                                          msr->mask);
2668                                 preempt_enable();
2669                                 if (ret)
2670                                         msr->data = old_msr_data;
2671                         }
2672                         break;
2673                 }
2674                 ret = kvm_set_msr_common(vcpu, msr_info);
2675         }
2676
2677         return ret;
2678 }
2679
2680 static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
2681 {
2682         __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
2683         switch (reg) {
2684         case VCPU_REGS_RSP:
2685                 vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
2686                 break;
2687         case VCPU_REGS_RIP:
2688                 vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP);
2689                 break;
2690         case VCPU_EXREG_PDPTR:
2691                 if (enable_ept)
2692                         ept_save_pdptrs(vcpu);
2693                 break;
2694         default:
2695                 break;
2696         }
2697 }
2698
2699 static __init int cpu_has_kvm_support(void)
2700 {
2701         return cpu_has_vmx();
2702 }
2703
2704 static __init int vmx_disabled_by_bios(void)
2705 {
2706         u64 msr;
2707
2708         rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
2709         if (msr & FEATURE_CONTROL_LOCKED) {
2710                 /* launched w/ TXT and VMX disabled */
2711                 if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX)
2712                         && tboot_enabled())
2713                         return 1;
2714                 /* launched w/o TXT and VMX only enabled w/ TXT */
2715                 if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX)
2716                         && (msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX)
2717                         && !tboot_enabled()) {
2718                         printk(KERN_WARNING "kvm: disable TXT in the BIOS or "
2719                                 "activate TXT before enabling KVM\n");
2720                         return 1;
2721                 }
2722                 /* launched w/o TXT and VMX disabled */
2723                 if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX)
2724                         && !tboot_enabled())
2725                         return 1;
2726         }
2727
2728         return 0;
2729 }
2730
2731 static void kvm_cpu_vmxon(u64 addr)
2732 {
2733         asm volatile (ASM_VMX_VMXON_RAX
2734                         : : "a"(&addr), "m"(addr)
2735                         : "memory", "cc");
2736 }
2737
2738 static int hardware_enable(void)
2739 {
2740         int cpu = raw_smp_processor_id();
2741         u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
2742         u64 old, test_bits;
2743
2744         if (read_cr4() & X86_CR4_VMXE)
2745                 return -EBUSY;
2746
2747         INIT_LIST_HEAD(&per_cpu(loaded_vmcss_on_cpu, cpu));
2748
2749         /*
2750          * Now we can enable the vmclear operation in kdump
2751          * since the loaded_vmcss_on_cpu list on this cpu
2752          * has been initialized.
2753          *
2754          * Though the cpu is not in VMX operation now, there
2755          * is no problem to enable the vmclear operation
2756          * for the loaded_vmcss_on_cpu list is empty!
2757          */
2758         crash_enable_local_vmclear(cpu);
2759
2760         rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
2761
2762         test_bits = FEATURE_CONTROL_LOCKED;
2763         test_bits |= FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX;
2764         if (tboot_enabled())
2765                 test_bits |= FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX;
2766
2767         if ((old & test_bits) != test_bits) {
2768                 /* enable and lock */
2769                 wrmsrl(MSR_IA32_FEATURE_CONTROL, old | test_bits);
2770         }
2771         write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
2772
2773         if (vmm_exclusive) {
2774                 kvm_cpu_vmxon(phys_addr);
2775                 ept_sync_global();
2776         }
2777
2778         native_store_gdt(this_cpu_ptr(&host_gdt));
2779
2780         return 0;
2781 }
2782
2783 static void vmclear_local_loaded_vmcss(void)
2784 {
2785         int cpu = raw_smp_processor_id();
2786         struct loaded_vmcs *v, *n;
2787
2788         list_for_each_entry_safe(v, n, &per_cpu(loaded_vmcss_on_cpu, cpu),
2789                                  loaded_vmcss_on_cpu_link)
2790                 __loaded_vmcs_clear(v);
2791 }
2792
2793
2794 /* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot()
2795  * tricks.
2796  */
2797 static void kvm_cpu_vmxoff(void)
2798 {
2799         asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
2800 }
2801
2802 static void hardware_disable(void)
2803 {
2804         if (vmm_exclusive) {
2805                 vmclear_local_loaded_vmcss();
2806                 kvm_cpu_vmxoff();
2807         }
2808         write_cr4(read_cr4() & ~X86_CR4_VMXE);
2809 }
2810
2811 static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
2812                                       u32 msr, u32 *result)
2813 {
2814         u32 vmx_msr_low, vmx_msr_high;
2815         u32 ctl = ctl_min | ctl_opt;
2816
2817         rdmsr(msr, vmx_msr_low, vmx_msr_high);
2818
2819         ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */
2820         ctl |= vmx_msr_low;  /* bit == 1 in low word  ==> must be one  */
2821
2822         /* Ensure minimum (required) set of control bits are supported. */
2823         if (ctl_min & ~ctl)
2824                 return -EIO;
2825
2826         *result = ctl;
2827         return 0;
2828 }
2829
2830 static __init bool allow_1_setting(u32 msr, u32 ctl)
2831 {
2832         u32 vmx_msr_low, vmx_msr_high;
2833
2834         rdmsr(msr, vmx_msr_low, vmx_msr_high);
2835         return vmx_msr_high & ctl;
2836 }
2837
2838 static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
2839 {
2840         u32 vmx_msr_low, vmx_msr_high;
2841         u32 min, opt, min2, opt2;
2842         u32 _pin_based_exec_control = 0;
2843         u32 _cpu_based_exec_control = 0;
2844         u32 _cpu_based_2nd_exec_control = 0;
2845         u32 _vmexit_control = 0;
2846         u32 _vmentry_control = 0;
2847
2848         min = CPU_BASED_HLT_EXITING |
2849 #ifdef CONFIG_X86_64
2850               CPU_BASED_CR8_LOAD_EXITING |
2851               CPU_BASED_CR8_STORE_EXITING |
2852 #endif
2853               CPU_BASED_CR3_LOAD_EXITING |
2854               CPU_BASED_CR3_STORE_EXITING |
2855               CPU_BASED_USE_IO_BITMAPS |
2856               CPU_BASED_MOV_DR_EXITING |
2857               CPU_BASED_USE_TSC_OFFSETING |
2858               CPU_BASED_MWAIT_EXITING |
2859               CPU_BASED_MONITOR_EXITING |
2860               CPU_BASED_INVLPG_EXITING |
2861               CPU_BASED_RDPMC_EXITING;
2862
2863         opt = CPU_BASED_TPR_SHADOW |
2864               CPU_BASED_USE_MSR_BITMAPS |
2865               CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
2866         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
2867                                 &_cpu_based_exec_control) < 0)
2868                 return -EIO;
2869 #ifdef CONFIG_X86_64
2870         if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
2871                 _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
2872                                            ~CPU_BASED_CR8_STORE_EXITING;
2873 #endif
2874         if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
2875                 min2 = 0;
2876                 opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
2877                         SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE |
2878                         SECONDARY_EXEC_WBINVD_EXITING |
2879                         SECONDARY_EXEC_ENABLE_VPID |
2880                         SECONDARY_EXEC_ENABLE_EPT |
2881                         SECONDARY_EXEC_UNRESTRICTED_GUEST |
2882                         SECONDARY_EXEC_PAUSE_LOOP_EXITING |
2883                         SECONDARY_EXEC_RDTSCP |
2884                         SECONDARY_EXEC_ENABLE_INVPCID |
2885                         SECONDARY_EXEC_APIC_REGISTER_VIRT |
2886                         SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
2887                         SECONDARY_EXEC_SHADOW_VMCS;
2888                 if (adjust_vmx_controls(min2, opt2,
2889                                         MSR_IA32_VMX_PROCBASED_CTLS2,
2890                                         &_cpu_based_2nd_exec_control) < 0)
2891                         return -EIO;
2892         }
2893 #ifndef CONFIG_X86_64
2894         if (!(_cpu_based_2nd_exec_control &
2895                                 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
2896                 _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW;
2897 #endif
2898
2899         if (!(_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
2900                 _cpu_based_2nd_exec_control &= ~(
2901                                 SECONDARY_EXEC_APIC_REGISTER_VIRT |
2902                                 SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE |
2903                                 SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY);
2904
2905         if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
2906                 /* CR3 accesses and invlpg don't need to cause VM Exits when EPT
2907                    enabled */
2908                 _cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING |
2909                                              CPU_BASED_CR3_STORE_EXITING |
2910                                              CPU_BASED_INVLPG_EXITING);
2911                 rdmsr(MSR_IA32_VMX_EPT_VPID_CAP,
2912                       vmx_capability.ept, vmx_capability.vpid);
2913         }
2914
2915         min = VM_EXIT_SAVE_DEBUG_CONTROLS;
2916 #ifdef CONFIG_X86_64
2917         min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
2918 #endif
2919         opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT |
2920                 VM_EXIT_ACK_INTR_ON_EXIT | VM_EXIT_CLEAR_BNDCFGS;
2921         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
2922                                 &_vmexit_control) < 0)
2923                 return -EIO;
2924
2925         min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
2926         opt = PIN_BASED_VIRTUAL_NMIS | PIN_BASED_POSTED_INTR;
2927         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
2928                                 &_pin_based_exec_control) < 0)
2929                 return -EIO;
2930
2931         if (!(_cpu_based_2nd_exec_control &
2932                 SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY) ||
2933                 !(_vmexit_control & VM_EXIT_ACK_INTR_ON_EXIT))
2934                 _pin_based_exec_control &= ~PIN_BASED_POSTED_INTR;
2935
2936         min = VM_ENTRY_LOAD_DEBUG_CONTROLS;
2937         opt = VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_LOAD_BNDCFGS;
2938         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
2939                                 &_vmentry_control) < 0)
2940                 return -EIO;
2941
2942         rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
2943
2944         /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
2945         if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
2946                 return -EIO;
2947
2948 #ifdef CONFIG_X86_64
2949         /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
2950         if (vmx_msr_high & (1u<<16))
2951                 return -EIO;
2952 #endif
2953
2954         /* Require Write-Back (WB) memory type for VMCS accesses. */
2955         if (((vmx_msr_high >> 18) & 15) != 6)
2956                 return -EIO;
2957
2958         vmcs_conf->size = vmx_msr_high & 0x1fff;
2959         vmcs_conf->order = get_order(vmcs_config.size);
2960         vmcs_conf->revision_id = vmx_msr_low;
2961
2962         vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
2963         vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
2964         vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
2965         vmcs_conf->vmexit_ctrl         = _vmexit_control;
2966         vmcs_conf->vmentry_ctrl        = _vmentry_control;
2967
2968         cpu_has_load_ia32_efer =
2969                 allow_1_setting(MSR_IA32_VMX_ENTRY_CTLS,
2970                                 VM_ENTRY_LOAD_IA32_EFER)
2971                 && allow_1_setting(MSR_IA32_VMX_EXIT_CTLS,
2972                                    VM_EXIT_LOAD_IA32_EFER);
2973
2974         cpu_has_load_perf_global_ctrl =
2975                 allow_1_setting(MSR_IA32_VMX_ENTRY_CTLS,
2976                                 VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL)
2977                 && allow_1_setting(MSR_IA32_VMX_EXIT_CTLS,
2978                                    VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL);
2979
2980         /*
2981          * Some cpus support VM_ENTRY_(LOAD|SAVE)_IA32_PERF_GLOBAL_CTRL
2982          * but due to arrata below it can't be used. Workaround is to use
2983          * msr load mechanism to switch IA32_PERF_GLOBAL_CTRL.
2984          *
2985          * VM Exit May Incorrectly Clear IA32_PERF_GLOBAL_CTRL [34:32]
2986          *
2987          * AAK155             (model 26)
2988          * AAP115             (model 30)
2989          * AAT100             (model 37)
2990          * BC86,AAY89,BD102   (model 44)
2991          * BA97               (model 46)
2992          *
2993          */
2994         if (cpu_has_load_perf_global_ctrl && boot_cpu_data.x86 == 0x6) {
2995                 switch (boot_cpu_data.x86_model) {
2996                 case 26:
2997                 case 30:
2998                 case 37:
2999                 case 44:
3000                 case 46:
3001                         cpu_has_load_perf_global_ctrl = false;
3002                         printk_once(KERN_WARNING"kvm: VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL "
3003                                         "does not work properly. Using workaround\n");
3004                         break;
3005                 default:
3006                         break;
3007                 }
3008         }
3009
3010         return 0;
3011 }
3012
3013 static struct vmcs *alloc_vmcs_cpu(int cpu)
3014 {
3015         int node = cpu_to_node(cpu);
3016         struct page *pages;
3017         struct vmcs *vmcs;
3018
3019         pages = alloc_pages_exact_node(node, GFP_KERNEL, vmcs_config.order);
3020         if (!pages)
3021                 return NULL;
3022         vmcs = page_address(pages);
3023         memset(vmcs, 0, vmcs_config.size);
3024         vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
3025         return vmcs;
3026 }
3027
3028 static struct vmcs *alloc_vmcs(void)
3029 {
3030         return alloc_vmcs_cpu(raw_smp_processor_id());
3031 }
3032
3033 static void free_vmcs(struct vmcs *vmcs)
3034 {
3035         free_pages((unsigned long)vmcs, vmcs_config.order);
3036 }
3037
3038 /*
3039  * Free a VMCS, but before that VMCLEAR it on the CPU where it was last loaded
3040  */
3041 static void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs)
3042 {
3043         if (!loaded_vmcs->vmcs)
3044                 return;
3045         loaded_vmcs_clear(loaded_vmcs);
3046         free_vmcs(loaded_vmcs->vmcs);
3047         loaded_vmcs->vmcs = NULL;
3048 }
3049
3050 static void free_kvm_area(void)
3051 {
3052         int cpu;
3053
3054         for_each_possible_cpu(cpu) {
3055                 free_vmcs(per_cpu(vmxarea, cpu));
3056                 per_cpu(vmxarea, cpu) = NULL;
3057         }
3058 }
3059
3060 static void init_vmcs_shadow_fields(void)
3061 {
3062         int i, j;
3063
3064         /* No checks for read only fields yet */
3065
3066         for (i = j = 0; i < max_shadow_read_write_fields; i++) {
3067                 switch (shadow_read_write_fields[i]) {
3068                 case GUEST_BNDCFGS:
3069                         if (!vmx_mpx_supported())
3070                                 continue;
3071                         break;
3072                 default:
3073                         break;
3074                 }
3075
3076                 if (j < i)
3077                         shadow_read_write_fields[j] =
3078                                 shadow_read_write_fields[i];
3079                 j++;
3080         }
3081         max_shadow_read_write_fields = j;
3082
3083         /* shadowed fields guest access without vmexit */
3084         for (i = 0; i < max_shadow_read_write_fields; i++) {
3085                 clear_bit(shadow_read_write_fields[i],
3086                           vmx_vmwrite_bitmap);
3087                 clear_bit(shadow_read_write_fields[i],
3088                           vmx_vmread_bitmap);
3089         }
3090         for (i = 0; i < max_shadow_read_only_fields; i++)
3091                 clear_bit(shadow_read_only_fields[i],
3092                           vmx_vmread_bitmap);
3093 }
3094
3095 static __init int alloc_kvm_area(void)
3096 {
3097         int cpu;
3098
3099         for_each_possible_cpu(cpu) {
3100                 struct vmcs *vmcs;
3101
3102                 vmcs = alloc_vmcs_cpu(cpu);
3103                 if (!vmcs) {
3104                         free_kvm_area();
3105                         return -ENOMEM;
3106                 }
3107
3108                 per_cpu(vmxarea, cpu) = vmcs;
3109         }
3110         return 0;
3111 }
3112
3113 static __init int hardware_setup(void)
3114 {
3115         if (setup_vmcs_config(&vmcs_config) < 0)
3116                 return -EIO;
3117
3118         if (boot_cpu_has(X86_FEATURE_NX))
3119                 kvm_enable_efer_bits(EFER_NX);
3120
3121         if (!cpu_has_vmx_vpid())
3122                 enable_vpid = 0;
3123         if (!cpu_has_vmx_shadow_vmcs())
3124                 enable_shadow_vmcs = 0;
3125         if (enable_shadow_vmcs)
3126                 init_vmcs_shadow_fields();
3127
3128         if (!cpu_has_vmx_ept() ||
3129             !cpu_has_vmx_ept_4levels()) {
3130                 enable_ept = 0;
3131                 enable_unrestricted_guest = 0;
3132                 enable_ept_ad_bits = 0;
3133         }
3134
3135         if (!cpu_has_vmx_ept_ad_bits())
3136                 enable_ept_ad_bits = 0;
3137
3138         if (!cpu_has_vmx_unrestricted_guest())
3139                 enable_unrestricted_guest = 0;
3140
3141         if (!cpu_has_vmx_flexpriority()) {
3142                 flexpriority_enabled = 0;
3143
3144                 /*
3145                  * set_apic_access_page_addr() is used to reload apic access
3146                  * page upon invalidation.  No need to do anything if the
3147                  * processor does not have the APIC_ACCESS_ADDR VMCS field.
3148                  */
3149                 kvm_x86_ops->set_apic_access_page_addr = NULL;
3150         }
3151
3152         if (!cpu_has_vmx_tpr_shadow())
3153                 kvm_x86_ops->update_cr8_intercept = NULL;
3154
3155         if (enable_ept && !cpu_has_vmx_ept_2m_page())
3156                 kvm_disable_largepages();
3157
3158         if (!cpu_has_vmx_ple())
3159                 ple_gap = 0;
3160
3161         if (!cpu_has_vmx_apicv())
3162                 enable_apicv = 0;
3163
3164         if (enable_apicv)
3165                 kvm_x86_ops->update_cr8_intercept = NULL;
3166         else {
3167                 kvm_x86_ops->hwapic_irr_update = NULL;
3168                 kvm_x86_ops->deliver_posted_interrupt = NULL;
3169                 kvm_x86_ops->sync_pir_to_irr = vmx_sync_pir_to_irr_dummy;
3170         }
3171
3172         if (nested)
3173                 nested_vmx_setup_ctls_msrs();
3174
3175         return alloc_kvm_area();
3176 }
3177
3178 static __exit void hardware_unsetup(void)
3179 {
3180         free_kvm_area();
3181 }
3182
3183 static bool emulation_required(struct kvm_vcpu *vcpu)
3184 {
3185         return emulate_invalid_guest_state && !guest_state_valid(vcpu);
3186 }
3187
3188 static void fix_pmode_seg(struct kvm_vcpu *vcpu, int seg,
3189                 struct kvm_segment *save)
3190 {
3191         if (!emulate_invalid_guest_state) {
3192                 /*
3193                  * CS and SS RPL should be equal during guest entry according
3194                  * to VMX spec, but in reality it is not always so. Since vcpu
3195                  * is in the middle of the transition from real mode to
3196                  * protected mode it is safe to assume that RPL 0 is a good
3197                  * default value.
3198                  */
3199                 if (seg == VCPU_SREG_CS || seg == VCPU_SREG_SS)
3200                         save->selector &= ~SELECTOR_RPL_MASK;
3201                 save->dpl = save->selector & SELECTOR_RPL_MASK;
3202                 save->s = 1;
3203         }
3204         vmx_set_segment(vcpu, save, seg);
3205 }
3206
3207 static void enter_pmode(struct kvm_vcpu *vcpu)
3208 {
3209         unsigned long flags;
3210         struct vcpu_vmx *vmx = to_vmx(vcpu);
3211
3212         /*
3213          * Update real mode segment cache. It may be not up-to-date if sement
3214          * register was written while vcpu was in a guest mode.
3215          */
3216         vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_ES], VCPU_SREG_ES);
3217         vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_DS], VCPU_SREG_DS);
3218         vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_FS], VCPU_SREG_FS);
3219         vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_GS], VCPU_SREG_GS);
3220         vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_SS], VCPU_SREG_SS);
3221         vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_CS], VCPU_SREG_CS);
3222
3223         vmx->rmode.vm86_active = 0;
3224
3225         vmx_segment_cache_clear(vmx);
3226
3227         vmx_set_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_TR], VCPU_SREG_TR);
3228
3229         flags = vmcs_readl(GUEST_RFLAGS);
3230         flags &= RMODE_GUEST_OWNED_EFLAGS_BITS;
3231         flags |= vmx->rmode.save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS;
3232         vmcs_writel(GUEST_RFLAGS, flags);
3233
3234         vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
3235                         (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
3236
3237         update_exception_bitmap(vcpu);
3238
3239         fix_pmode_seg(vcpu, VCPU_SREG_CS, &vmx->rmode.segs[VCPU_SREG_CS]);
3240         fix_pmode_seg(vcpu, VCPU_SREG_SS, &vmx->rmode.segs[VCPU_SREG_SS]);
3241         fix_pmode_seg(vcpu, VCPU_SREG_ES, &vmx->rmode.segs[VCPU_SREG_ES]);
3242         fix_pmode_seg(vcpu, VCPU_SREG_DS, &vmx->rmode.segs[VCPU_SREG_DS]);
3243         fix_pmode_seg(vcpu, VCPU_SREG_FS, &vmx->rmode.segs[VCPU_SREG_FS]);
3244         fix_pmode_seg(vcpu, VCPU_SREG_GS, &vmx->rmode.segs[VCPU_SREG_GS]);
3245 }
3246
3247 static void fix_rmode_seg(int seg, struct kvm_segment *save)
3248 {
3249         const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
3250         struct kvm_segment var = *save;
3251
3252         var.dpl = 0x3;
3253         if (seg == VCPU_SREG_CS)
3254                 var.type = 0x3;
3255
3256         if (!emulate_invalid_guest_state) {
3257                 var.selector = var.base >> 4;
3258                 var.base = var.base & 0xffff0;
3259                 var.limit = 0xffff;
3260                 var.g = 0;
3261                 var.db = 0;
3262                 var.present = 1;
3263                 var.s = 1;
3264                 var.l = 0;
3265                 var.unusable = 0;
3266                 var.type = 0x3;
3267                 var.avl = 0;
3268                 if (save->base & 0xf)
3269                         printk_once(KERN_WARNING "kvm: segment base is not "
3270                                         "paragraph aligned when entering "
3271                                         "protected mode (seg=%d)", seg);
3272         }
3273
3274         vmcs_write16(sf->selector, var.selector);
3275         vmcs_write32(sf->base, var.base);
3276         vmcs_write32(sf->limit, var.limit);
3277         vmcs_write32(sf->ar_bytes, vmx_segment_access_rights(&var));
3278 }
3279
3280 static void enter_rmode(struct kvm_vcpu *vcpu)
3281 {
3282         unsigned long flags;
3283         struct vcpu_vmx *vmx = to_vmx(vcpu);
3284
3285         vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_TR], VCPU_SREG_TR);
3286         vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_ES], VCPU_SREG_ES);
3287         vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_DS], VCPU_SREG_DS);
3288         vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_FS], VCPU_SREG_FS);
3289         vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_GS], VCPU_SREG_GS);
3290         vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_SS], VCPU_SREG_SS);
3291         vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_CS], VCPU_SREG_CS);
3292
3293         vmx->rmode.vm86_active = 1;
3294
3295         /*
3296          * Very old userspace does not call KVM_SET_TSS_ADDR before entering
3297          * vcpu. Warn the user that an update is overdue.
3298          */
3299         if (!vcpu->kvm->arch.tss_addr)
3300                 printk_once(KERN_WARNING "kvm: KVM_SET_TSS_ADDR need to be "
3301                              "called before entering vcpu\n");
3302
3303         vmx_segment_cache_clear(vmx);
3304
3305         vmcs_writel(GUEST_TR_BASE, vcpu->kvm->arch.tss_addr);
3306         vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);
3307         vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
3308
3309         flags = vmcs_readl(GUEST_RFLAGS);
3310         vmx->rmode.save_rflags = flags;
3311
3312         flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
3313
3314         vmcs_writel(GUEST_RFLAGS, flags);
3315         vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
3316         update_exception_bitmap(vcpu);
3317
3318         fix_rmode_seg(VCPU_SREG_SS, &vmx->rmode.segs[VCPU_SREG_SS]);
3319         fix_rmode_seg(VCPU_SREG_CS, &vmx->rmode.segs[VCPU_SREG_CS]);
3320         fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.segs[VCPU_SREG_ES]);
3321         fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.segs[VCPU_SREG_DS]);
3322         fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.segs[VCPU_SREG_GS]);
3323         fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.segs[VCPU_SREG_FS]);
3324
3325         kvm_mmu_reset_context(vcpu);
3326 }
3327
3328 static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
3329 {
3330         struct vcpu_vmx *vmx = to_vmx(vcpu);
3331         struct shared_msr_entry *msr = find_msr_entry(vmx, MSR_EFER);
3332
3333         if (!msr)
3334                 return;
3335
3336         /*
3337          * Force kernel_gs_base reloading before EFER changes, as control
3338          * of this msr depends on is_long_mode().
3339          */
3340         vmx_load_host_state(to_vmx(vcpu));
3341         vcpu->arch.efer = efer;
3342         if (efer & EFER_LMA) {
3343                 vm_entry_controls_setbit(to_vmx(vcpu), VM_ENTRY_IA32E_MODE);
3344                 msr->data = efer;
3345         } else {
3346                 vm_entry_controls_clearbit(to_vmx(vcpu), VM_ENTRY_IA32E_MODE);
3347
3348                 msr->data = efer & ~EFER_LME;
3349         }
3350         setup_msrs(vmx);
3351 }
3352
3353 #ifdef CONFIG_X86_64
3354
3355 static void enter_lmode(struct kvm_vcpu *vcpu)
3356 {
3357         u32 guest_tr_ar;
3358
3359         vmx_segment_cache_clear(to_vmx(vcpu));
3360
3361         guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
3362         if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
3363                 pr_debug_ratelimited("%s: tss fixup for long mode. \n",
3364                                      __func__);
3365                 vmcs_write32(GUEST_TR_AR_BYTES,
3366                              (guest_tr_ar & ~AR_TYPE_MASK)
3367                              | AR_TYPE_BUSY_64_TSS);
3368         }
3369         vmx_set_efer(vcpu, vcpu->arch.efer | EFER_LMA);
3370 }
3371
3372 static void exit_lmode(struct kvm_vcpu *vcpu)
3373 {
3374         vm_entry_controls_clearbit(to_vmx(vcpu), VM_ENTRY_IA32E_MODE);
3375         vmx_set_efer(vcpu, vcpu->arch.efer & ~EFER_LMA);
3376 }
3377
3378 #endif
3379
3380 static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
3381 {
3382         vpid_sync_context(to_vmx(vcpu));
3383         if (enable_ept) {
3384                 if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
3385                         return;
3386                 ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa));
3387         }
3388 }
3389
3390 static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
3391 {
3392         ulong cr0_guest_owned_bits = vcpu->arch.cr0_guest_owned_bits;
3393
3394         vcpu->arch.cr0 &= ~cr0_guest_owned_bits;
3395         vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & cr0_guest_owned_bits;
3396 }
3397
3398 static void vmx_decache_cr3(struct kvm_vcpu *vcpu)
3399 {
3400         if (enable_ept && is_paging(vcpu))
3401                 vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
3402         __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
3403 }
3404
3405 static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
3406 {
3407         ulong cr4_guest_owned_bits = vcpu->arch.cr4_guest_owned_bits;
3408
3409         vcpu->arch.cr4 &= ~cr4_guest_owned_bits;
3410         vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & cr4_guest_owned_bits;
3411 }
3412
3413 static void ept_load_pdptrs(struct kvm_vcpu *vcpu)
3414 {
3415         struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
3416
3417         if (!test_bit(VCPU_EXREG_PDPTR,
3418                       (unsigned long *)&vcpu->arch.regs_dirty))
3419                 return;
3420
3421         if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
3422                 vmcs_write64(GUEST_PDPTR0, mmu->pdptrs[0]);
3423                 vmcs_write64(GUEST_PDPTR1, mmu->pdptrs[1]);
3424                 vmcs_write64(GUEST_PDPTR2, mmu->pdptrs[2]);
3425                 vmcs_write64(GUEST_PDPTR3, mmu->pdptrs[3]);
3426         }
3427 }
3428
3429 static void ept_save_pdptrs(struct kvm_vcpu *vcpu)
3430 {
3431         struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
3432
3433         if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
3434                 mmu->pdptrs[0] = vmcs_read64(GUEST_PDPTR0);
3435                 mmu->pdptrs[1] = vmcs_read64(GUEST_PDPTR1);
3436                 mmu->pdptrs[2] = vmcs_read64(GUEST_PDPTR2);
3437                 mmu->pdptrs[3] = vmcs_read64(GUEST_PDPTR3);
3438         }
3439
3440         __set_bit(VCPU_EXREG_PDPTR,
3441                   (unsigned long *)&vcpu->arch.regs_avail);
3442         __set_bit(VCPU_EXREG_PDPTR,
3443                   (unsigned long *)&vcpu->arch.regs_dirty);
3444 }
3445
3446 static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
3447
3448 static void ept_update_paging_mode_cr0(unsigned long *hw_cr0,
3449                                         unsigned long cr0,
3450                                         struct kvm_vcpu *vcpu)
3451 {
3452         if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail))
3453                 vmx_decache_cr3(vcpu);
3454         if (!(cr0 & X86_CR0_PG)) {
3455                 /* From paging/starting to nonpaging */
3456                 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
3457                              vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) |
3458                              (CPU_BASED_CR3_LOAD_EXITING |
3459                               CPU_BASED_CR3_STORE_EXITING));
3460                 vcpu->arch.cr0 = cr0;
3461                 vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
3462         } else if (!is_paging(vcpu)) {
3463                 /* From nonpaging to paging */
3464                 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
3465                              vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) &
3466                              ~(CPU_BASED_CR3_LOAD_EXITING |
3467                                CPU_BASED_CR3_STORE_EXITING));
3468                 vcpu->arch.cr0 = cr0;
3469                 vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
3470         }
3471
3472         if (!(cr0 & X86_CR0_WP))
3473                 *hw_cr0 &= ~X86_CR0_WP;
3474 }
3475
3476 static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
3477 {
3478         struct vcpu_vmx *vmx = to_vmx(vcpu);
3479         unsigned long hw_cr0;
3480
3481         hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK);
3482         if (enable_unrestricted_guest)
3483                 hw_cr0 |= KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST;
3484         else {
3485                 hw_cr0 |= KVM_VM_CR0_ALWAYS_ON;
3486
3487                 if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE))
3488                         enter_pmode(vcpu);
3489
3490                 if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE))
3491                         enter_rmode(vcpu);
3492         }
3493
3494 #ifdef CONFIG_X86_64
3495         if (vcpu->arch.efer & EFER_LME) {
3496                 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
3497                         enter_lmode(vcpu);
3498                 if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
3499                         exit_lmode(vcpu);
3500         }
3501 #endif
3502
3503         if (enable_ept)
3504                 ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu);
3505
3506         if (!vcpu->fpu_active)
3507                 hw_cr0 |= X86_CR0_TS | X86_CR0_MP;
3508
3509         vmcs_writel(CR0_READ_SHADOW, cr0);
3510         vmcs_writel(GUEST_CR0, hw_cr0);
3511         vcpu->arch.cr0 = cr0;
3512
3513         /* depends on vcpu->arch.cr0 to be set to a new value */
3514         vmx->emulation_required = emulation_required(vcpu);
3515 }
3516
3517 static u64 construct_eptp(unsigned long root_hpa)
3518 {
3519         u64 eptp;
3520
3521         /* TODO write the value reading from MSR */
3522         eptp = VMX_EPT_DEFAULT_MT |
3523                 VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
3524         if (enable_ept_ad_bits)
3525                 eptp |= VMX_EPT_AD_ENABLE_BIT;
3526         eptp |= (root_hpa & PAGE_MASK);
3527
3528         return eptp;
3529 }
3530
3531 static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
3532 {
3533         unsigned long guest_cr3;
3534         u64 eptp;
3535
3536         guest_cr3 = cr3;
3537         if (enable_ept) {
3538                 eptp = construct_eptp(cr3);
3539                 vmcs_write64(EPT_POINTER, eptp);
3540                 if (is_paging(vcpu) || is_guest_mode(vcpu))
3541                         guest_cr3 = kvm_read_cr3(vcpu);
3542                 else
3543                         guest_cr3 = vcpu->kvm->arch.ept_identity_map_addr;
3544                 ept_load_pdptrs(vcpu);
3545         }
3546
3547         vmx_flush_tlb(vcpu);
3548         vmcs_writel(GUEST_CR3, guest_cr3);
3549 }
3550
3551 static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
3552 {
3553         unsigned long hw_cr4 = cr4 | (to_vmx(vcpu)->rmode.vm86_active ?
3554                     KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON);
3555
3556         if (cr4 & X86_CR4_VMXE) {
3557                 /*
3558                  * To use VMXON (and later other VMX instructions), a guest
3559                  * must first be able to turn on cr4.VMXE (see handle_vmon()).
3560                  * So basically the check on whether to allow nested VMX
3561                  * is here.
3562                  */
3563                 if (!nested_vmx_allowed(vcpu))
3564                         return 1;
3565         }
3566         if (to_vmx(vcpu)->nested.vmxon &&
3567             ((cr4 & VMXON_CR4_ALWAYSON) != VMXON_CR4_ALWAYSON))
3568                 return 1;
3569
3570         vcpu->arch.cr4 = cr4;
3571         if (enable_ept) {
3572                 if (!is_paging(vcpu)) {
3573                         hw_cr4 &= ~X86_CR4_PAE;
3574                         hw_cr4 |= X86_CR4_PSE;
3575                         /*
3576                          * SMEP/SMAP is disabled if CPU is in non-paging mode
3577                          * in hardware. However KVM always uses paging mode to
3578                          * emulate guest non-paging mode with TDP.
3579                          * To emulate this behavior, SMEP/SMAP needs to be
3580                          * manually disabled when guest switches to non-paging
3581                          * mode.
3582                          */
3583                         hw_cr4 &= ~(X86_CR4_SMEP | X86_CR4_SMAP);
3584                 } else if (!(cr4 & X86_CR4_PAE)) {
3585                         hw_cr4 &= ~X86_CR4_PAE;
3586                 }
3587         }
3588
3589         vmcs_writel(CR4_READ_SHADOW, cr4);
3590         vmcs_writel(GUEST_CR4, hw_cr4);
3591         return 0;
3592 }
3593
3594 static void vmx_get_segment(struct kvm_vcpu *vcpu,
3595                             struct kvm_segment *var, int seg)
3596 {
3597         struct vcpu_vmx *vmx = to_vmx(vcpu);
3598         u32 ar;
3599
3600         if (vmx->rmode.vm86_active && seg != VCPU_SREG_LDTR) {
3601                 *var = vmx->rmode.segs[seg];
3602                 if (seg == VCPU_SREG_TR
3603                     || var->selector == vmx_read_guest_seg_selector(vmx, seg))
3604                         return;
3605                 var->base = vmx_read_guest_seg_base(vmx, seg);
3606                 var->selector = vmx_read_guest_seg_selector(vmx, seg);
3607                 return;
3608         }
3609         var->base = vmx_read_guest_seg_base(vmx, seg);
3610         var->limit = vmx_read_guest_seg_limit(vmx, seg);
3611         var->selector = vmx_read_guest_seg_selector(vmx, seg);
3612         ar = vmx_read_guest_seg_ar(vmx, seg);
3613         var->unusable = (ar >> 16) & 1;
3614         var->type = ar & 15;
3615         var->s = (ar >> 4) & 1;
3616         var->dpl = (ar >> 5) & 3;
3617         /*
3618          * Some userspaces do not preserve unusable property. Since usable
3619          * segment has to be present according to VMX spec we can use present
3620          * property to amend userspace bug by making unusable segment always
3621          * nonpresent. vmx_segment_access_rights() already marks nonpresent
3622          * segment as unusable.
3623          */
3624         var->present = !var->unusable;
3625         var->avl = (ar >> 12) & 1;
3626         var->l = (ar >> 13) & 1;
3627         var->db = (ar >> 14) & 1;
3628         var->g = (ar >> 15) & 1;
3629 }
3630
3631 static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
3632 {
3633         struct kvm_segment s;
3634
3635         if (to_vmx(vcpu)->rmode.vm86_active) {
3636                 vmx_get_segment(vcpu, &s, seg);
3637                 return s.base;
3638         }
3639         return vmx_read_guest_seg_base(to_vmx(vcpu), seg);
3640 }
3641
3642 static int vmx_get_cpl(struct kvm_vcpu *vcpu)
3643 {
3644         struct vcpu_vmx *vmx = to_vmx(vcpu);
3645
3646         if (unlikely(vmx->rmode.vm86_active))
3647                 return 0;
3648         else {
3649                 int ar = vmx_read_guest_seg_ar(vmx, VCPU_SREG_SS);
3650                 return AR_DPL(ar);
3651         }
3652 }
3653
3654 static u32 vmx_segment_access_rights(struct kvm_segment *var)
3655 {
3656         u32 ar;
3657
3658         if (var->unusable || !var->present)
3659                 ar = 1 << 16;
3660         else {
3661                 ar = var->type & 15;
3662                 ar |= (var->s & 1) << 4;
3663                 ar |= (var->dpl & 3) << 5;
3664                 ar |= (var->present & 1) << 7;
3665                 ar |= (var->avl & 1) << 12;
3666                 ar |= (var->l & 1) << 13;
3667                 ar |= (var->db & 1) << 14;
3668                 ar |= (var->g & 1) << 15;
3669         }
3670
3671         return ar;
3672 }
3673
3674 static void vmx_set_segment(struct kvm_vcpu *vcpu,
3675                             struct kvm_segment *var, int seg)
3676 {
3677         struct vcpu_vmx *vmx = to_vmx(vcpu);
3678         const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
3679
3680         vmx_segment_cache_clear(vmx);
3681
3682         if (vmx->rmode.vm86_active && seg != VCPU_SREG_LDTR) {
3683                 vmx->rmode.segs[seg] = *var;
3684                 if (seg == VCPU_SREG_TR)
3685                         vmcs_write16(sf->selector, var->selector);
3686                 else if (var->s)
3687                         fix_rmode_seg(seg, &vmx->rmode.segs[seg]);
3688                 goto out;
3689         }
3690
3691         vmcs_writel(sf->base, var->base);
3692         vmcs_write32(sf->limit, var->limit);
3693         vmcs_write16(sf->selector, var->selector);
3694
3695         /*
3696          *   Fix the "Accessed" bit in AR field of segment registers for older
3697          * qemu binaries.
3698          *   IA32 arch specifies that at the time of processor reset the
3699          * "Accessed" bit in the AR field of segment registers is 1. And qemu
3700          * is setting it to 0 in the userland code. This causes invalid guest
3701          * state vmexit when "unrestricted guest" mode is turned on.
3702          *    Fix for this setup issue in cpu_reset is being pushed in the qemu
3703          * tree. Newer qemu binaries with that qemu fix would not need this
3704          * kvm hack.
3705          */
3706         if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR))
3707                 var->type |= 0x1; /* Accessed */
3708
3709         vmcs_write32(sf->ar_bytes, vmx_segment_access_rights(var));
3710
3711 out:
3712         vmx->emulation_required = emulation_required(vcpu);
3713 }
3714
3715 static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
3716 {
3717         u32 ar = vmx_read_guest_seg_ar(to_vmx(vcpu), VCPU_SREG_CS);
3718
3719         *db = (ar >> 14) & 1;
3720         *l = (ar >> 13) & 1;
3721 }
3722
3723 static void vmx_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
3724 {
3725         dt->size = vmcs_read32(GUEST_IDTR_LIMIT);
3726         dt->address = vmcs_readl(GUEST_IDTR_BASE);
3727 }
3728
3729 static void vmx_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
3730 {
3731         vmcs_write32(GUEST_IDTR_LIMIT, dt->size);
3732         vmcs_writel(GUEST_IDTR_BASE, dt->address);
3733 }
3734
3735 static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
3736 {
3737         dt->size = vmcs_read32(GUEST_GDTR_LIMIT);
3738         dt->address = vmcs_readl(GUEST_GDTR_BASE);
3739 }
3740
3741 static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
3742 {
3743         vmcs_write32(GUEST_GDTR_LIMIT, dt->size);
3744         vmcs_writel(GUEST_GDTR_BASE, dt->address);
3745 }
3746
3747 static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
3748 {
3749         struct kvm_segment var;
3750         u32 ar;
3751
3752         vmx_get_segment(vcpu, &var, seg);
3753         var.dpl = 0x3;
3754         if (seg == VCPU_SREG_CS)
3755                 var.type = 0x3;
3756         ar = vmx_segment_access_rights(&var);
3757
3758         if (var.base != (var.selector << 4))
3759                 return false;
3760         if (var.limit != 0xffff)
3761                 return false;
3762         if (ar != 0xf3)
3763                 return false;
3764
3765         return true;
3766 }
3767
3768 static bool code_segment_valid(struct kvm_vcpu *vcpu)
3769 {
3770         struct kvm_segment cs;
3771         unsigned int cs_rpl;
3772
3773         vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
3774         cs_rpl = cs.selector & SELECTOR_RPL_MASK;
3775
3776         if (cs.unusable)
3777                 return false;
3778         if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK))
3779                 return false;
3780         if (!cs.s)
3781                 return false;
3782         if (cs.type & AR_TYPE_WRITEABLE_MASK) {
3783                 if (cs.dpl > cs_rpl)
3784                         return false;
3785         } else {
3786                 if (cs.dpl != cs_rpl)
3787                         return false;
3788         }
3789         if (!cs.present)
3790                 return false;
3791
3792         /* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */
3793         return true;
3794 }
3795
3796 static bool stack_segment_valid(struct kvm_vcpu *vcpu)
3797 {
3798         struct kvm_segment ss;
3799         unsigned int ss_rpl;
3800
3801         vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
3802         ss_rpl = ss.selector & SELECTOR_RPL_MASK;
3803
3804         if (ss.unusable)
3805                 return true;
3806         if (ss.type != 3 && ss.type != 7)
3807                 return false;
3808         if (!ss.s)
3809                 return false;
3810         if (ss.dpl != ss_rpl) /* DPL != RPL */
3811                 return false;
3812         if (!ss.present)
3813                 return false;
3814
3815         return true;
3816 }
3817
3818 static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg)
3819 {
3820         struct kvm_segment var;
3821         unsigned int rpl;
3822
3823         vmx_get_segment(vcpu, &var, seg);
3824         rpl = var.selector & SELECTOR_RPL_MASK;
3825
3826         if (var.unusable)
3827                 return true;
3828         if (!var.s)
3829                 return false;
3830         if (!var.present)
3831                 return false;
3832         if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) {
3833                 if (var.dpl < rpl) /* DPL < RPL */
3834                         return false;
3835         }
3836
3837         /* TODO: Add other members to kvm_segment_field to allow checking for other access
3838          * rights flags
3839          */
3840         return true;
3841 }
3842
3843 static bool tr_valid(struct kvm_vcpu *vcpu)
3844 {
3845         struct kvm_segment tr;
3846
3847         vmx_get_segment(vcpu, &tr, VCPU_SREG_TR);
3848
3849         if (tr.unusable)
3850                 return false;
3851         if (tr.selector & SELECTOR_TI_MASK)     /* TI = 1 */
3852                 return false;
3853         if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */
3854                 return false;
3855         if (!tr.present)
3856                 return false;
3857
3858         return true;
3859 }
3860
3861 static bool ldtr_valid(struct kvm_vcpu *vcpu)
3862 {
3863         struct kvm_segment ldtr;
3864
3865         vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR);
3866
3867         if (ldtr.unusable)
3868                 return true;
3869         if (ldtr.selector & SELECTOR_TI_MASK)   /* TI = 1 */
3870                 return false;
3871         if (ldtr.type != 2)
3872                 return false;
3873         if (!ldtr.present)
3874                 return false;
3875
3876         return true;
3877 }
3878
3879 static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu)
3880 {
3881         struct kvm_segment cs, ss;
3882
3883         vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
3884         vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
3885
3886         return ((cs.selector & SELECTOR_RPL_MASK) ==
3887                  (ss.selector & SELECTOR_RPL_MASK));
3888 }
3889
3890 /*
3891  * Check if guest state is valid. Returns true if valid, false if
3892  * not.
3893  * We assume that registers are always usable
3894  */
3895 static bool guest_state_valid(struct kvm_vcpu *vcpu)
3896 {
3897         if (enable_unrestricted_guest)
3898                 return true;
3899
3900         /* real mode guest state checks */
3901         if (!is_protmode(vcpu) || (vmx_get_rflags(vcpu) & X86_EFLAGS_VM)) {
3902                 if (!rmode_segment_valid(vcpu, VCPU_SREG_CS))
3903                         return false;
3904                 if (!rmode_segment_valid(vcpu, VCPU_SREG_SS))
3905                         return false;
3906                 if (!rmode_segment_valid(vcpu, VCPU_SREG_DS))
3907                         return false;
3908                 if (!rmode_segment_valid(vcpu, VCPU_SREG_ES))
3909                         return false;
3910                 if (!rmode_segment_valid(vcpu, VCPU_SREG_FS))
3911                         return false;
3912                 if (!rmode_segment_valid(vcpu, VCPU_SREG_GS))
3913                         return false;
3914         } else {
3915         /* protected mode guest state checks */
3916                 if (!cs_ss_rpl_check(vcpu))
3917                         return false;
3918                 if (!code_segment_valid(vcpu))
3919                         return false;
3920                 if (!stack_segment_valid(vcpu))
3921                         return false;
3922                 if (!data_segment_valid(vcpu, VCPU_SREG_DS))
3923                         return false;
3924                 if (!data_segment_valid(vcpu, VCPU_SREG_ES))
3925                         return false;
3926                 if (!data_segment_valid(vcpu, VCPU_SREG_FS))
3927                         return false;
3928                 if (!data_segment_valid(vcpu, VCPU_SREG_GS))
3929                         return false;
3930                 if (!tr_valid(vcpu))
3931                         return false;
3932                 if (!ldtr_valid(vcpu))
3933                         return false;
3934         }
3935         /* TODO:
3936          * - Add checks on RIP
3937          * - Add checks on RFLAGS
3938          */
3939
3940         return true;
3941 }
3942
3943 static int init_rmode_tss(struct kvm *kvm)
3944 {
3945         gfn_t fn;
3946         u16 data = 0;
3947         int idx, r;
3948
3949         idx = srcu_read_lock(&kvm->srcu);
3950         fn = kvm->arch.tss_addr >> PAGE_SHIFT;
3951         r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
3952         if (r < 0)
3953                 goto out;
3954         data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
3955         r = kvm_write_guest_page(kvm, fn++, &data,
3956                         TSS_IOPB_BASE_OFFSET, sizeof(u16));
3957         if (r < 0)
3958                 goto out;
3959         r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE);
3960         if (r < 0)
3961                 goto out;
3962         r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
3963         if (r < 0)
3964                 goto out;
3965         data = ~0;
3966         r = kvm_write_guest_page(kvm, fn, &data,
3967                                  RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1,
3968                                  sizeof(u8));
3969 out:
3970         srcu_read_unlock(&kvm->srcu, idx);
3971         return r;
3972 }
3973
3974 static int init_rmode_identity_map(struct kvm *kvm)
3975 {
3976         int i, idx, r = 0;
3977         pfn_t identity_map_pfn;
3978         u32 tmp;
3979
3980         if (!enable_ept)
3981                 return 0;
3982
3983         /* Protect kvm->arch.ept_identity_pagetable_done. */
3984         mutex_lock(&kvm->slots_lock);
3985
3986         if (likely(kvm->arch.ept_identity_pagetable_done))
3987                 goto out2;
3988
3989         identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT;
3990
3991         r = alloc_identity_pagetable(kvm);
3992         if (r < 0)
3993                 goto out2;
3994
3995         idx = srcu_read_lock(&kvm->srcu);
3996         r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE);
3997         if (r < 0)
3998                 goto out;
3999         /* Set up identity-mapping pagetable for EPT in real mode */
4000         for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
4001                 tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
4002                         _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
4003                 r = kvm_write_guest_page(kvm, identity_map_pfn,
4004                                 &tmp, i * sizeof(tmp), sizeof(tmp));
4005                 if (r < 0)
4006                         goto out;
4007         }
4008         kvm->arch.ept_identity_pagetable_done = true;
4009
4010 out:
4011         srcu_read_unlock(&kvm->srcu, idx);
4012
4013 out2:
4014         mutex_unlock(&kvm->slots_lock);
4015         return r;
4016 }
4017
4018 static void seg_setup(int seg)
4019 {
4020         const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
4021         unsigned int ar;
4022
4023         vmcs_write16(sf->selector, 0);
4024         vmcs_writel(sf->base, 0);
4025         vmcs_write32(sf->limit, 0xffff);
4026         ar = 0x93;
4027         if (seg == VCPU_SREG_CS)
4028                 ar |= 0x08; /* code segment */
4029
4030         vmcs_write32(sf->ar_bytes, ar);
4031 }
4032
4033 static int alloc_apic_access_page(struct kvm *kvm)
4034 {
4035         struct page *page;
4036         struct kvm_userspace_memory_region kvm_userspace_mem;
4037         int r = 0;
4038
4039         mutex_lock(&kvm->slots_lock);
4040         if (kvm->arch.apic_access_page_done)
4041                 goto out;
4042         kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
4043         kvm_userspace_mem.flags = 0;
4044         kvm_userspace_mem.guest_phys_addr = APIC_DEFAULT_PHYS_BASE;
4045         kvm_userspace_mem.memory_size = PAGE_SIZE;
4046         r = __kvm_set_memory_region(kvm, &kvm_userspace_mem);
4047         if (r)
4048                 goto out;
4049
4050         page = gfn_to_page(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT);
4051         if (is_error_page(page)) {
4052                 r = -EFAULT;
4053                 goto out;
4054         }
4055
4056         /*
4057          * Do not pin the page in memory, so that memory hot-unplug
4058          * is able to migrate it.
4059          */
4060         put_page(page);
4061         kvm->arch.apic_access_page_done = true;
4062 out:
4063         mutex_unlock(&kvm->slots_lock);
4064         return r;
4065 }
4066
4067 static int alloc_identity_pagetable(struct kvm *kvm)
4068 {
4069         /* Called with kvm->slots_lock held. */
4070
4071         struct kvm_userspace_memory_region kvm_userspace_mem;
4072         int r = 0;
4073
4074         BUG_ON(kvm->arch.ept_identity_pagetable_done);
4075
4076         kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
4077         kvm_userspace_mem.flags = 0;
4078         kvm_userspace_mem.guest_phys_addr =
4079                 kvm->arch.ept_identity_map_addr;
4080         kvm_userspace_mem.memory_size = PAGE_SIZE;
4081         r = __kvm_set_memory_region(kvm, &kvm_userspace_mem);
4082
4083         return r;
4084 }
4085
4086 static void allocate_vpid(struct vcpu_vmx *vmx)
4087 {
4088         int vpid;
4089
4090         vmx->vpid = 0;
4091         if (!enable_vpid)
4092                 return;
4093         spin_lock(&vmx_vpid_lock);
4094         vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS);
4095         if (vpid < VMX_NR_VPIDS) {
4096                 vmx->vpid = vpid;
4097                 __set_bit(vpid, vmx_vpid_bitmap);
4098         }
4099         spin_unlock(&vmx_vpid_lock);
4100 }
4101
4102 static void free_vpid(struct vcpu_vmx *vmx)
4103 {
4104         if (!enable_vpid)
4105                 return;
4106         spin_lock(&vmx_vpid_lock);
4107         if (vmx->vpid != 0)
4108                 __clear_bit(vmx->vpid, vmx_vpid_bitmap);
4109         spin_unlock(&vmx_vpid_lock);
4110 }
4111
4112 #define MSR_TYPE_R      1
4113 #define MSR_TYPE_W      2
4114 static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap,
4115                                                 u32 msr, int type)
4116 {
4117         int f = sizeof(unsigned long);
4118
4119         if (!cpu_has_vmx_msr_bitmap())
4120                 return;
4121
4122         /*
4123          * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals
4124          * have the write-low and read-high bitmap offsets the wrong way round.
4125          * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff.
4126          */
4127         if (msr <= 0x1fff) {
4128                 if (type & MSR_TYPE_R)
4129                         /* read-low */
4130                         __clear_bit(msr, msr_bitmap + 0x000 / f);
4131
4132                 if (type & MSR_TYPE_W)
4133                         /* write-low */
4134                         __clear_bit(msr, msr_bitmap + 0x800 / f);
4135
4136         } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
4137                 msr &= 0x1fff;
4138                 if (type & MSR_TYPE_R)
4139                         /* read-high */
4140                         __clear_bit(msr, msr_bitmap + 0x400 / f);
4141
4142                 if (type & MSR_TYPE_W)
4143                         /* write-high */
4144                         __clear_bit(msr, msr_bitmap + 0xc00 / f);
4145
4146         }
4147 }
4148
4149 static void __vmx_enable_intercept_for_msr(unsigned long *msr_bitmap,
4150                                                 u32 msr, int type)
4151 {
4152         int f = sizeof(unsigned long);
4153
4154         if (!cpu_has_vmx_msr_bitmap())
4155                 return;
4156
4157         /*
4158          * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals
4159          * have the write-low and read-high bitmap offsets the wrong way round.
4160          * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff.
4161          */
4162         if (msr <= 0x1fff) {
4163                 if (type & MSR_TYPE_R)
4164                         /* read-low */
4165                         __set_bit(msr, msr_bitmap + 0x000 / f);
4166
4167                 if (type & MSR_TYPE_W)
4168                         /* write-low */
4169                         __set_bit(msr, msr_bitmap + 0x800 / f);
4170
4171         } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
4172                 msr &= 0x1fff;
4173                 if (type & MSR_TYPE_R)
4174                         /* read-high */
4175                         __set_bit(msr, msr_bitmap + 0x400 / f);
4176
4177                 if (type & MSR_TYPE_W)
4178                         /* write-high */
4179                         __set_bit(msr, msr_bitmap + 0xc00 / f);
4180
4181         }
4182 }
4183
4184 static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only)
4185 {
4186         if (!longmode_only)
4187                 __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy,
4188                                                 msr, MSR_TYPE_R | MSR_TYPE_W);
4189         __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode,
4190                                                 msr, MSR_TYPE_R | MSR_TYPE_W);
4191 }
4192
4193 static void vmx_enable_intercept_msr_read_x2apic(u32 msr)
4194 {
4195         __vmx_enable_intercept_for_msr(vmx_msr_bitmap_legacy_x2apic,
4196                         msr, MSR_TYPE_R);
4197         __vmx_enable_intercept_for_msr(vmx_msr_bitmap_longmode_x2apic,
4198                         msr, MSR_TYPE_R);
4199 }
4200
4201 static void vmx_disable_intercept_msr_read_x2apic(u32 msr)
4202 {
4203         __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy_x2apic,
4204                         msr, MSR_TYPE_R);
4205         __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode_x2apic,
4206                         msr, MSR_TYPE_R);
4207 }
4208
4209 static void vmx_disable_intercept_msr_write_x2apic(u32 msr)
4210 {
4211         __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy_x2apic,
4212                         msr, MSR_TYPE_W);
4213         __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode_x2apic,
4214                         msr, MSR_TYPE_W);
4215 }
4216
4217 static int vmx_vm_has_apicv(struct kvm *kvm)
4218 {
4219         return enable_apicv && irqchip_in_kernel(kvm);
4220 }
4221
4222 /*
4223  * Send interrupt to vcpu via posted interrupt way.
4224  * 1. If target vcpu is running(non-root mode), send posted interrupt
4225  * notification to vcpu and hardware will sync PIR to vIRR atomically.
4226  * 2. If target vcpu isn't running(root mode), kick it to pick up the
4227  * interrupt from PIR in next vmentry.
4228  */
4229 static void vmx_deliver_posted_interrupt(struct kvm_vcpu *vcpu, int vector)
4230 {
4231         struct vcpu_vmx *vmx = to_vmx(vcpu);
4232         int r;
4233
4234         if (pi_test_and_set_pir(vector, &vmx->pi_desc))
4235                 return;
4236
4237         r = pi_test_and_set_on(&vmx->pi_desc);
4238         kvm_make_request(KVM_REQ_EVENT, vcpu);
4239 #ifdef CONFIG_SMP
4240         if (!r && (vcpu->mode == IN_GUEST_MODE))
4241                 apic->send_IPI_mask(get_cpu_mask(vcpu->cpu),
4242                                 POSTED_INTR_VECTOR);
4243         else
4244 #endif
4245                 kvm_vcpu_kick(vcpu);
4246 }
4247
4248 static void vmx_sync_pir_to_irr(struct kvm_vcpu *vcpu)
4249 {
4250         struct vcpu_vmx *vmx = to_vmx(vcpu);
4251
4252         if (!pi_test_and_clear_on(&vmx->pi_desc))
4253                 return;
4254
4255         kvm_apic_update_irr(vcpu, vmx->pi_desc.pir);
4256 }
4257
4258 static void vmx_sync_pir_to_irr_dummy(struct kvm_vcpu *vcpu)
4259 {
4260         return;
4261 }
4262
4263 /*
4264  * Set up the vmcs's constant host-state fields, i.e., host-state fields that
4265  * will not change in the lifetime of the guest.
4266  * Note that host-state that does change is set elsewhere. E.g., host-state
4267  * that is set differently for each CPU is set in vmx_vcpu_load(), not here.
4268  */
4269 static void vmx_set_constant_host_state(struct vcpu_vmx *vmx)
4270 {
4271         u32 low32, high32;
4272         unsigned long tmpl;
4273         struct desc_ptr dt;
4274         unsigned long cr4;
4275
4276         vmcs_writel(HOST_CR0, read_cr0() & ~X86_CR0_TS);  /* 22.2.3 */
4277         vmcs_writel(HOST_CR3, read_cr3());  /* 22.2.3  FIXME: shadow tables */
4278
4279         /* Save the most likely value for this task's CR4 in the VMCS. */
4280         cr4 = read_cr4();
4281         vmcs_writel(HOST_CR4, cr4);                     /* 22.2.3, 22.2.5 */
4282         vmx->host_state.vmcs_host_cr4 = cr4;
4283
4284         vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS);  /* 22.2.4 */
4285 #ifdef CONFIG_X86_64
4286         /*
4287          * Load null selectors, so we can avoid reloading them in
4288          * __vmx_load_host_state(), in case userspace uses the null selectors
4289          * too (the expected case).
4290          */
4291         vmcs_write16(HOST_DS_SELECTOR, 0);
4292         vmcs_write16(HOST_ES_SELECTOR, 0);
4293 #else
4294         vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
4295         vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
4296 #endif
4297         vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
4298         vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8);  /* 22.2.4 */
4299
4300         native_store_idt(&dt);
4301         vmcs_writel(HOST_IDTR_BASE, dt.address);   /* 22.2.4 */
4302         vmx->host_idt_base = dt.address;
4303
4304         vmcs_writel(HOST_RIP, vmx_return); /* 22.2.5 */
4305
4306         rdmsr(MSR_IA32_SYSENTER_CS, low32, high32);
4307         vmcs_write32(HOST_IA32_SYSENTER_CS, low32);
4308         rdmsrl(MSR_IA32_SYSENTER_EIP, tmpl);
4309         vmcs_writel(HOST_IA32_SYSENTER_EIP, tmpl);   /* 22.2.3 */
4310
4311         if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) {
4312                 rdmsr(MSR_IA32_CR_PAT, low32, high32);
4313                 vmcs_write64(HOST_IA32_PAT, low32 | ((u64) high32 << 32));
4314         }
4315 }
4316
4317 static void set_cr4_guest_host_mask(struct vcpu_vmx *vmx)
4318 {
4319         vmx->vcpu.arch.cr4_guest_owned_bits = KVM_CR4_GUEST_OWNED_BITS;
4320         if (enable_ept)
4321                 vmx->vcpu.arch.cr4_guest_owned_bits |= X86_CR4_PGE;
4322         if (is_guest_mode(&vmx->vcpu))
4323                 vmx->vcpu.arch.cr4_guest_owned_bits &=
4324                         ~get_vmcs12(&vmx->vcpu)->cr4_guest_host_mask;
4325         vmcs_writel(CR4_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr4_guest_owned_bits);
4326 }
4327
4328 static u32 vmx_pin_based_exec_ctrl(struct vcpu_vmx *vmx)
4329 {
4330         u32 pin_based_exec_ctrl = vmcs_config.pin_based_exec_ctrl;
4331
4332         if (!vmx_vm_has_apicv(vmx->vcpu.kvm))
4333                 pin_based_exec_ctrl &= ~PIN_BASED_POSTED_INTR;
4334         return pin_based_exec_ctrl;
4335 }
4336
4337 static u32 vmx_exec_control(struct vcpu_vmx *vmx)
4338 {
4339         u32 exec_control = vmcs_config.cpu_based_exec_ctrl;
4340
4341         if (vmx->vcpu.arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT)
4342                 exec_control &= ~CPU_BASED_MOV_DR_EXITING;
4343
4344         if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) {
4345                 exec_control &= ~CPU_BASED_TPR_SHADOW;
4346 #ifdef CONFIG_X86_64
4347                 exec_control |= CPU_BASED_CR8_STORE_EXITING |
4348                                 CPU_BASED_CR8_LOAD_EXITING;
4349 #endif
4350         }
4351         if (!enable_ept)
4352                 exec_control |= CPU_BASED_CR3_STORE_EXITING |
4353                                 CPU_BASED_CR3_LOAD_EXITING  |
4354                                 CPU_BASED_INVLPG_EXITING;
4355         return exec_control;
4356 }
4357
4358 static u32 vmx_secondary_exec_control(struct vcpu_vmx *vmx)
4359 {
4360         u32 exec_control = vmcs_config.cpu_based_2nd_exec_ctrl;
4361         if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
4362                 exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
4363         if (vmx->vpid == 0)
4364                 exec_control &= ~SECONDARY_EXEC_ENABLE_VPID;
4365         if (!enable_ept) {
4366                 exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
4367                 enable_unrestricted_guest = 0;
4368                 /* Enable INVPCID for non-ept guests may cause performance regression. */
4369                 exec_control &= ~SECONDARY_EXEC_ENABLE_INVPCID;
4370         }
4371         if (!enable_unrestricted_guest)
4372                 exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
4373         if (!ple_gap)
4374                 exec_control &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING;
4375         if (!vmx_vm_has_apicv(vmx->vcpu.kvm))
4376                 exec_control &= ~(SECONDARY_EXEC_APIC_REGISTER_VIRT |
4377                                   SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY);
4378         exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE;
4379         /* SECONDARY_EXEC_SHADOW_VMCS is enabled when L1 executes VMPTRLD
4380            (handle_vmptrld).
4381            We can NOT enable shadow_vmcs here because we don't have yet
4382            a current VMCS12
4383         */
4384         exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS;
4385         return exec_control;
4386 }
4387
4388 static void ept_set_mmio_spte_mask(void)
4389 {
4390         /*
4391          * EPT Misconfigurations can be generated if the value of bits 2:0
4392          * of an EPT paging-structure entry is 110b (write/execute).
4393          * Also, magic bits (0x3ull << 62) is set to quickly identify mmio
4394          * spte.
4395          */
4396         kvm_mmu_set_mmio_spte_mask((0x3ull << 62) | 0x6ull);
4397 }
4398
4399 /*
4400  * Sets up the vmcs for emulated real mode.
4401  */
4402 static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
4403 {
4404 #ifdef CONFIG_X86_64
4405         unsigned long a;
4406 #endif
4407         int i;
4408
4409         /* I/O */
4410         vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a));
4411         vmcs_write64(IO_BITMAP_B, __pa(vmx_io_bitmap_b));
4412
4413         if (enable_shadow_vmcs) {
4414                 vmcs_write64(VMREAD_BITMAP, __pa(vmx_vmread_bitmap));
4415                 vmcs_write64(VMWRITE_BITMAP, __pa(vmx_vmwrite_bitmap));
4416         }
4417         if (cpu_has_vmx_msr_bitmap())
4418                 vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap_legacy));
4419
4420         vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
4421
4422         /* Control */
4423         vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, vmx_pin_based_exec_ctrl(vmx));
4424
4425         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, vmx_exec_control(vmx));
4426
4427         if (cpu_has_secondary_exec_ctrls()) {
4428                 vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
4429                                 vmx_secondary_exec_control(vmx));
4430         }
4431
4432         if (vmx_vm_has_apicv(vmx->vcpu.kvm)) {
4433                 vmcs_write64(EOI_EXIT_BITMAP0, 0);
4434                 vmcs_write64(EOI_EXIT_BITMAP1, 0);
4435                 vmcs_write64(EOI_EXIT_BITMAP2, 0);
4436                 vmcs_write64(EOI_EXIT_BITMAP3, 0);
4437
4438                 vmcs_write16(GUEST_INTR_STATUS, 0);
4439
4440                 vmcs_write64(POSTED_INTR_NV, POSTED_INTR_VECTOR);
4441                 vmcs_write64(POSTED_INTR_DESC_ADDR, __pa((&vmx->pi_desc)));
4442         }
4443
4444         if (ple_gap) {
4445                 vmcs_write32(PLE_GAP, ple_gap);
4446                 vmx->ple_window = ple_window;
4447                 vmx->ple_window_dirty = true;
4448         }
4449
4450         vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0);
4451         vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0);
4452         vmcs_write32(CR3_TARGET_COUNT, 0);           /* 22.2.1 */
4453
4454         vmcs_write16(HOST_FS_SELECTOR, 0);            /* 22.2.4 */
4455         vmcs_write16(HOST_GS_SELECTOR, 0);            /* 22.2.4 */
4456         vmx_set_constant_host_state(vmx);
4457 #ifdef CONFIG_X86_64
4458         rdmsrl(MSR_FS_BASE, a);
4459         vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
4460         rdmsrl(MSR_GS_BASE, a);
4461         vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
4462 #else
4463         vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
4464         vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
4465 #endif
4466
4467         vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
4468         vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
4469         vmcs_write64(VM_EXIT_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.host));
4470         vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
4471         vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.guest));
4472
4473         if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
4474                 u32 msr_low, msr_high;
4475                 u64 host_pat;
4476                 rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
4477                 host_pat = msr_low | ((u64) msr_high << 32);
4478                 /* Write the default value follow host pat */
4479                 vmcs_write64(GUEST_IA32_PAT, host_pat);
4480                 /* Keep arch.pat sync with GUEST_IA32_PAT */
4481                 vmx->vcpu.arch.pat = host_pat;
4482         }
4483
4484         for (i = 0; i < ARRAY_SIZE(vmx_msr_index); ++i) {
4485                 u32 index = vmx_msr_index[i];
4486                 u32 data_low, data_high;
4487                 int j = vmx->nmsrs;
4488
4489                 if (rdmsr_safe(index, &data_low, &data_high) < 0)
4490                         continue;
4491                 if (wrmsr_safe(index, data_low, data_high) < 0)
4492                         continue;
4493                 vmx->guest_msrs[j].index = i;
4494                 vmx->guest_msrs[j].data = 0;
4495                 vmx->guest_msrs[j].mask = -1ull;
4496                 ++vmx->nmsrs;
4497         }
4498
4499
4500         vm_exit_controls_init(vmx, vmcs_config.vmexit_ctrl);
4501
4502         /* 22.2.1, 20.8.1 */
4503         vm_entry_controls_init(vmx, vmcs_config.vmentry_ctrl);
4504
4505         vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
4506         set_cr4_guest_host_mask(vmx);
4507
4508         return 0;
4509 }
4510
4511 static void vmx_vcpu_reset(struct kvm_vcpu *vcpu)
4512 {
4513         struct vcpu_vmx *vmx = to_vmx(vcpu);
4514         struct msr_data apic_base_msr;
4515
4516         vmx->rmode.vm86_active = 0;
4517
4518         vmx->soft_vnmi_blocked = 0;
4519
4520         vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
4521         kvm_set_cr8(&vmx->vcpu, 0);
4522         apic_base_msr.data = APIC_DEFAULT_PHYS_BASE | MSR_IA32_APICBASE_ENABLE;
4523         if (kvm_vcpu_is_bsp(&vmx->vcpu))
4524                 apic_base_msr.data |= MSR_IA32_APICBASE_BSP;
4525         apic_base_msr.host_initiated = true;
4526         kvm_set_apic_base(&vmx->vcpu, &apic_base_msr);
4527
4528         vmx_segment_cache_clear(vmx);
4529
4530         seg_setup(VCPU_SREG_CS);
4531         vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
4532         vmcs_write32(GUEST_CS_BASE, 0xffff0000);
4533
4534         seg_setup(VCPU_SREG_DS);
4535         seg_setup(VCPU_SREG_ES);
4536         seg_setup(VCPU_SREG_FS);
4537         seg_setup(VCPU_SREG_GS);
4538         seg_setup(VCPU_SREG_SS);
4539
4540         vmcs_write16(GUEST_TR_SELECTOR, 0);
4541         vmcs_writel(GUEST_TR_BASE, 0);
4542         vmcs_write32(GUEST_TR_LIMIT, 0xffff);
4543         vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
4544
4545         vmcs_write16(GUEST_LDTR_SELECTOR, 0);
4546         vmcs_writel(GUEST_LDTR_BASE, 0);
4547         vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
4548         vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);
4549
4550         vmcs_write32(GUEST_SYSENTER_CS, 0);
4551         vmcs_writel(GUEST_SYSENTER_ESP, 0);
4552         vmcs_writel(GUEST_SYSENTER_EIP, 0);
4553
4554         vmcs_writel(GUEST_RFLAGS, 0x02);
4555         kvm_rip_write(vcpu, 0xfff0);
4556
4557         vmcs_writel(GUEST_GDTR_BASE, 0);
4558         vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);
4559
4560         vmcs_writel(GUEST_IDTR_BASE, 0);
4561         vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);
4562
4563         vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE);
4564         vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
4565         vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);
4566
4567         /* Special registers */
4568         vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
4569
4570         setup_msrs(vmx);
4571
4572         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);  /* 22.2.1 */
4573
4574         if (cpu_has_vmx_tpr_shadow()) {
4575                 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0);
4576                 if (vm_need_tpr_shadow(vmx->vcpu.kvm))
4577                         vmcs_write64(VIRTUAL_APIC_PAGE_ADDR,
4578                                      __pa(vmx->vcpu.arch.apic->regs));
4579                 vmcs_write32(TPR_THRESHOLD, 0);
4580         }
4581
4582         kvm_vcpu_reload_apic_access_page(vcpu);
4583
4584         if (vmx_vm_has_apicv(vcpu->kvm))
4585                 memset(&vmx->pi_desc, 0, sizeof(struct pi_desc));
4586
4587         if (vmx->vpid != 0)
4588                 vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
4589
4590         vmx->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET;
4591         vmx_set_cr0(&vmx->vcpu, kvm_read_cr0(vcpu)); /* enter rmode */
4592         vmx_set_cr4(&vmx->vcpu, 0);
4593         vmx_set_efer(&vmx->vcpu, 0);
4594         vmx_fpu_activate(&vmx->vcpu);
4595         update_exception_bitmap(&vmx->vcpu);
4596
4597         vpid_sync_context(vmx);
4598 }
4599
4600 /*
4601  * In nested virtualization, check if L1 asked to exit on external interrupts.
4602  * For most existing hypervisors, this will always return true.
4603  */
4604 static bool nested_exit_on_intr(struct kvm_vcpu *vcpu)
4605 {
4606         return get_vmcs12(vcpu)->pin_based_vm_exec_control &
4607                 PIN_BASED_EXT_INTR_MASK;
4608 }
4609
4610 /*
4611  * In nested virtualization, check if L1 has set
4612  * VM_EXIT_ACK_INTR_ON_EXIT
4613  */
4614 static bool nested_exit_intr_ack_set(struct kvm_vcpu *vcpu)
4615 {
4616         return get_vmcs12(vcpu)->vm_exit_controls &
4617                 VM_EXIT_ACK_INTR_ON_EXIT;
4618 }
4619
4620 static bool nested_exit_on_nmi(struct kvm_vcpu *vcpu)
4621 {
4622         return get_vmcs12(vcpu)->pin_based_vm_exec_control &
4623                 PIN_BASED_NMI_EXITING;
4624 }
4625
4626 static void enable_irq_window(struct kvm_vcpu *vcpu)
4627 {
4628         u32 cpu_based_vm_exec_control;
4629
4630         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
4631         cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
4632         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
4633 }
4634
4635 static void enable_nmi_window(struct kvm_vcpu *vcpu)
4636 {
4637         u32 cpu_based_vm_exec_control;
4638
4639         if (!cpu_has_virtual_nmis() ||
4640             vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_STI) {
4641                 enable_irq_window(vcpu);
4642                 return;
4643         }
4644
4645         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
4646         cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING;
4647         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
4648 }
4649
4650 static void vmx_inject_irq(struct kvm_vcpu *vcpu)
4651 {
4652         struct vcpu_vmx *vmx = to_vmx(vcpu);
4653         uint32_t intr;
4654         int irq = vcpu->arch.interrupt.nr;
4655
4656         trace_kvm_inj_virq(irq);
4657
4658         ++vcpu->stat.irq_injections;
4659         if (vmx->rmode.vm86_active) {
4660                 int inc_eip = 0;
4661                 if (vcpu->arch.interrupt.soft)
4662                         inc_eip = vcpu->arch.event_exit_inst_len;
4663                 if (kvm_inject_realmode_interrupt(vcpu, irq, inc_eip) != EMULATE_DONE)
4664                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
4665                 return;
4666         }
4667         intr = irq | INTR_INFO_VALID_MASK;
4668         if (vcpu->arch.interrupt.soft) {
4669                 intr |= INTR_TYPE_SOFT_INTR;
4670                 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
4671                              vmx->vcpu.arch.event_exit_inst_len);
4672         } else
4673                 intr |= INTR_TYPE_EXT_INTR;
4674         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr);
4675 }
4676
4677 static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
4678 {
4679         struct vcpu_vmx *vmx = to_vmx(vcpu);
4680
4681         if (is_guest_mode(vcpu))
4682                 return;
4683
4684         if (!cpu_has_virtual_nmis()) {
4685                 /*
4686                  * Tracking the NMI-blocked state in software is built upon
4687                  * finding the next open IRQ window. This, in turn, depends on
4688                  * well-behaving guests: They have to keep IRQs disabled at
4689                  * least as long as the NMI handler runs. Otherwise we may
4690                  * cause NMI nesting, maybe breaking the guest. But as this is
4691                  * highly unlikely, we can live with the residual risk.
4692                  */
4693                 vmx->soft_vnmi_blocked = 1;
4694                 vmx->vnmi_blocked_time = 0;
4695         }
4696
4697         ++vcpu->stat.nmi_injections;
4698         vmx->nmi_known_unmasked = false;
4699         if (vmx->rmode.vm86_active) {
4700                 if (kvm_inject_realmode_interrupt(vcpu, NMI_VECTOR, 0) != EMULATE_DONE)
4701                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
4702                 return;
4703         }
4704         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
4705                         INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR);
4706 }
4707
4708 static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu)
4709 {
4710         if (!cpu_has_virtual_nmis())
4711                 return to_vmx(vcpu)->soft_vnmi_blocked;
4712         if (to_vmx(vcpu)->nmi_known_unmasked)
4713                 return false;
4714         return vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_NMI;
4715 }
4716
4717 static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
4718 {
4719         struct vcpu_vmx *vmx = to_vmx(vcpu);
4720
4721         if (!cpu_has_virtual_nmis()) {
4722                 if (vmx->soft_vnmi_blocked != masked) {
4723                         vmx->soft_vnmi_blocked = masked;
4724                         vmx->vnmi_blocked_time = 0;
4725                 }
4726         } else {
4727                 vmx->nmi_known_unmasked = !masked;
4728                 if (masked)
4729                         vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
4730                                       GUEST_INTR_STATE_NMI);
4731                 else
4732                         vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
4733                                         GUEST_INTR_STATE_NMI);
4734         }
4735 }
4736
4737 static int vmx_nmi_allowed(struct kvm_vcpu *vcpu)
4738 {
4739         if (to_vmx(vcpu)->nested.nested_run_pending)
4740                 return 0;
4741
4742         if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked)
4743                 return 0;
4744
4745         return  !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
4746                   (GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_STI
4747                    | GUEST_INTR_STATE_NMI));
4748 }
4749
4750 static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
4751 {
4752         return (!to_vmx(vcpu)->nested.nested_run_pending &&
4753                 vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
4754                 !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
4755                         (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS));
4756 }
4757
4758 static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
4759 {
4760         int ret;
4761         struct kvm_userspace_memory_region tss_mem = {
4762                 .slot = TSS_PRIVATE_MEMSLOT,
4763                 .guest_phys_addr = addr,
4764                 .memory_size = PAGE_SIZE * 3,
4765                 .flags = 0,
4766         };
4767
4768         ret = kvm_set_memory_region(kvm, &tss_mem);
4769         if (ret)
4770                 return ret;
4771         kvm->arch.tss_addr = addr;
4772         return init_rmode_tss(kvm);
4773 }
4774
4775 static bool rmode_exception(struct kvm_vcpu *vcpu, int vec)
4776 {
4777         switch (vec) {
4778         case BP_VECTOR:
4779                 /*
4780                  * Update instruction length as we may reinject the exception
4781                  * from user space while in guest debugging mode.
4782                  */
4783                 to_vmx(vcpu)->vcpu.arch.event_exit_inst_len =
4784                         vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
4785                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
4786                         return false;
4787                 /* fall through */
4788         case DB_VECTOR:
4789                 if (vcpu->guest_debug &
4790                         (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
4791                         return false;
4792                 /* fall through */
4793         case DE_VECTOR:
4794         case OF_VECTOR:
4795         case BR_VECTOR:
4796         case UD_VECTOR:
4797         case DF_VECTOR:
4798         case SS_VECTOR:
4799         case GP_VECTOR:
4800         case MF_VECTOR:
4801                 return true;
4802         break;
4803         }
4804         return false;
4805 }
4806
4807 static int handle_rmode_exception(struct kvm_vcpu *vcpu,
4808                                   int vec, u32 err_code)
4809 {
4810         /*
4811          * Instruction with address size override prefix opcode 0x67
4812          * Cause the #SS fault with 0 error code in VM86 mode.
4813          */
4814         if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0) {
4815                 if (emulate_instruction(vcpu, 0) == EMULATE_DONE) {
4816                         if (vcpu->arch.halt_request) {
4817                                 vcpu->arch.halt_request = 0;
4818                                 return kvm_emulate_halt(vcpu);
4819                         }
4820                         return 1;
4821                 }
4822                 return 0;
4823         }
4824
4825         /*
4826          * Forward all other exceptions that are valid in real mode.
4827          * FIXME: Breaks guest debugging in real mode, needs to be fixed with
4828          *        the required debugging infrastructure rework.
4829          */
4830         kvm_queue_exception(vcpu, vec);
4831         return 1;
4832 }
4833
4834 /*
4835  * Trigger machine check on the host. We assume all the MSRs are already set up
4836  * by the CPU and that we still run on the same CPU as the MCE occurred on.
4837  * We pass a fake environment to the machine check handler because we want
4838  * the guest to be always treated like user space, no matter what context
4839  * it used internally.
4840  */
4841 static void kvm_machine_check(void)
4842 {
4843 #if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64)
4844         struct pt_regs regs = {
4845                 .cs = 3, /* Fake ring 3 no matter what the guest ran on */
4846                 .flags = X86_EFLAGS_IF,
4847         };
4848
4849         do_machine_check(&regs, 0);
4850 #endif
4851 }
4852
4853 static int handle_machine_check(struct kvm_vcpu *vcpu)
4854 {
4855         /* already handled by vcpu_run */
4856         return 1;
4857 }
4858
4859 static int handle_exception(struct kvm_vcpu *vcpu)
4860 {
4861         struct vcpu_vmx *vmx = to_vmx(vcpu);
4862         struct kvm_run *kvm_run = vcpu->run;
4863         u32 intr_info, ex_no, error_code;
4864         unsigned long cr2, rip, dr6;
4865         u32 vect_info;
4866         enum emulation_result er;
4867
4868         vect_info = vmx->idt_vectoring_info;
4869         intr_info = vmx->exit_intr_info;
4870
4871         if (is_machine_check(intr_info))
4872                 return handle_machine_check(vcpu);
4873
4874         if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR)
4875                 return 1;  /* already handled by vmx_vcpu_run() */
4876
4877         if (is_no_device(intr_info)) {
4878                 vmx_fpu_activate(vcpu);
4879                 return 1;
4880         }
4881
4882         if (is_invalid_opcode(intr_info)) {
4883                 er = emulate_instruction(vcpu, EMULTYPE_TRAP_UD);
4884                 if (er != EMULATE_DONE)
4885                         kvm_queue_exception(vcpu, UD_VECTOR);
4886                 return 1;
4887         }
4888
4889         error_code = 0;
4890         if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
4891                 error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
4892
4893         /*
4894          * The #PF with PFEC.RSVD = 1 indicates the guest is accessing
4895          * MMIO, it is better to report an internal error.
4896          * See the comments in vmx_handle_exit.
4897          */
4898         if ((vect_info & VECTORING_INFO_VALID_MASK) &&
4899             !(is_page_fault(intr_info) && !(error_code & PFERR_RSVD_MASK))) {
4900                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
4901                 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_SIMUL_EX;
4902                 vcpu->run->internal.ndata = 2;
4903                 vcpu->run->internal.data[0] = vect_info;
4904                 vcpu->run->internal.data[1] = intr_info;
4905                 return 0;
4906         }
4907
4908         if (is_page_fault(intr_info)) {
4909                 /* EPT won't cause page fault directly */
4910                 BUG_ON(enable_ept);
4911                 cr2 = vmcs_readl(EXIT_QUALIFICATION);
4912                 trace_kvm_page_fault(cr2, error_code);
4913
4914                 if (kvm_event_needs_reinjection(vcpu))
4915                         kvm_mmu_unprotect_page_virt(vcpu, cr2);
4916                 return kvm_mmu_page_fault(vcpu, cr2, error_code, NULL, 0);
4917         }
4918
4919         ex_no = intr_info & INTR_INFO_VECTOR_MASK;
4920
4921         if (vmx->rmode.vm86_active && rmode_exception(vcpu, ex_no))
4922                 return handle_rmode_exception(vcpu, ex_no, error_code);
4923
4924         switch (ex_no) {
4925         case DB_VECTOR:
4926                 dr6 = vmcs_readl(EXIT_QUALIFICATION);
4927                 if (!(vcpu->guest_debug &
4928                       (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
4929                         vcpu->arch.dr6 &= ~15;
4930                         vcpu->arch.dr6 |= dr6 | DR6_RTM;
4931                         if (!(dr6 & ~DR6_RESERVED)) /* icebp */
4932                                 skip_emulated_instruction(vcpu);
4933
4934                         kvm_queue_exception(vcpu, DB_VECTOR);
4935                         return 1;
4936                 }
4937                 kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1;
4938                 kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7);
4939                 /* fall through */
4940         case BP_VECTOR:
4941                 /*
4942                  * Update instruction length as we may reinject #BP from
4943                  * user space while in guest debugging mode. Reading it for
4944                  * #DB as well causes no harm, it is not used in that case.
4945                  */
4946                 vmx->vcpu.arch.event_exit_inst_len =
4947                         vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
4948                 kvm_run->exit_reason = KVM_EXIT_DEBUG;
4949                 rip = kvm_rip_read(vcpu);
4950                 kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip;
4951                 kvm_run->debug.arch.exception = ex_no;
4952                 break;
4953         default:
4954                 kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
4955                 kvm_run->ex.exception = ex_no;
4956                 kvm_run->ex.error_code = error_code;
4957                 break;
4958         }
4959         return 0;
4960 }
4961
4962 static int handle_external_interrupt(struct kvm_vcpu *vcpu)
4963 {
4964         ++vcpu->stat.irq_exits;
4965         return 1;
4966 }
4967
4968 static int handle_triple_fault(struct kvm_vcpu *vcpu)
4969 {
4970         vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
4971         return 0;
4972 }
4973
4974 static int handle_io(struct kvm_vcpu *vcpu)
4975 {
4976         unsigned long exit_qualification;
4977         int size, in, string;
4978         unsigned port;
4979
4980         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4981         string = (exit_qualification & 16) != 0;
4982         in = (exit_qualification & 8) != 0;
4983
4984         ++vcpu->stat.io_exits;
4985
4986         if (string || in)
4987                 return emulate_instruction(vcpu, 0) == EMULATE_DONE;
4988
4989         port = exit_qualification >> 16;
4990         size = (exit_qualification & 7) + 1;
4991         skip_emulated_instruction(vcpu);
4992
4993         return kvm_fast_pio_out(vcpu, size, port);
4994 }
4995
4996 static void
4997 vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
4998 {
4999         /*
5000          * Patch in the VMCALL instruction:
5001          */
5002         hypercall[0] = 0x0f;
5003         hypercall[1] = 0x01;
5004         hypercall[2] = 0xc1;
5005 }
5006
5007 static bool nested_cr0_valid(struct vmcs12 *vmcs12, unsigned long val)
5008 {
5009         unsigned long always_on = VMXON_CR0_ALWAYSON;
5010
5011         if (nested_vmx_secondary_ctls_high &
5012                 SECONDARY_EXEC_UNRESTRICTED_GUEST &&
5013             nested_cpu_has2(vmcs12, SECONDARY_EXEC_UNRESTRICTED_GUEST))
5014                 always_on &= ~(X86_CR0_PE | X86_CR0_PG);
5015         return (val & always_on) == always_on;
5016 }
5017
5018 /* called to set cr0 as appropriate for a mov-to-cr0 exit. */
5019 static int handle_set_cr0(struct kvm_vcpu *vcpu, unsigned long val)
5020 {
5021         if (is_guest_mode(vcpu)) {
5022                 struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
5023                 unsigned long orig_val = val;
5024
5025                 /*
5026                  * We get here when L2 changed cr0 in a way that did not change
5027                  * any of L1's shadowed bits (see nested_vmx_exit_handled_cr),
5028                  * but did change L0 shadowed bits. So we first calculate the
5029                  * effective cr0 value that L1 would like to write into the
5030                  * hardware. It consists of the L2-owned bits from the new
5031                  * value combined with the L1-owned bits from L1's guest_cr0.
5032                  */
5033                 val = (val & ~vmcs12->cr0_guest_host_mask) |
5034                         (vmcs12->guest_cr0 & vmcs12->cr0_guest_host_mask);
5035
5036                 if (!nested_cr0_valid(vmcs12, val))
5037                         return 1;
5038
5039                 if (kvm_set_cr0(vcpu, val))
5040                         return 1;
5041                 vmcs_writel(CR0_READ_SHADOW, orig_val);
5042                 return 0;
5043         } else {
5044                 if (to_vmx(vcpu)->nested.vmxon &&
5045                     ((val & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON))
5046                         return 1;
5047                 return kvm_set_cr0(vcpu, val);
5048         }
5049 }
5050
5051 static int handle_set_cr4(struct kvm_vcpu *vcpu, unsigned long val)
5052 {
5053         if (is_guest_mode(vcpu)) {
5054                 struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
5055                 unsigned long orig_val = val;
5056
5057                 /* analogously to handle_set_cr0 */
5058                 val = (val & ~vmcs12->cr4_guest_host_mask) |
5059                         (vmcs12->guest_cr4 & vmcs12->cr4_guest_host_mask);
5060                 if (kvm_set_cr4(vcpu, val))
5061                         return 1;
5062                 vmcs_writel(CR4_READ_SHADOW, orig_val);
5063                 return 0;
5064         } else
5065                 return kvm_set_cr4(vcpu, val);
5066 }
5067
5068 /* called to set cr0 as approriate for clts instruction exit. */
5069 static void handle_clts(struct kvm_vcpu *vcpu)
5070 {
5071         if (is_guest_mode(vcpu)) {
5072                 /*
5073                  * We get here when L2 did CLTS, and L1 didn't shadow CR0.TS
5074                  * but we did (!fpu_active). We need to keep GUEST_CR0.TS on,
5075                  * just pretend it's off (also in arch.cr0 for fpu_activate).
5076                  */
5077                 vmcs_writel(CR0_READ_SHADOW,
5078                         vmcs_readl(CR0_READ_SHADOW) & ~X86_CR0_TS);
5079                 vcpu->arch.cr0 &= ~X86_CR0_TS;
5080         } else
5081                 vmx_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~X86_CR0_TS));
5082 }
5083
5084 static int handle_cr(struct kvm_vcpu *vcpu)
5085 {
5086         unsigned long exit_qualification, val;
5087         int cr;
5088         int reg;
5089         int err;
5090
5091         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5092         cr = exit_qualification & 15;
5093         reg = (exit_qualification >> 8) & 15;
5094         switch ((exit_qualification >> 4) & 3) {
5095         case 0: /* mov to cr */
5096                 val = kvm_register_readl(vcpu, reg);
5097                 trace_kvm_cr_write(cr, val);
5098                 switch (cr) {
5099                 case 0:
5100                         err = handle_set_cr0(vcpu, val);
5101                         kvm_complete_insn_gp(vcpu, err);
5102                         return 1;
5103                 case 3:
5104                         err = kvm_set_cr3(vcpu, val);
5105                         kvm_complete_insn_gp(vcpu, err);
5106                         return 1;
5107                 case 4:
5108                         err = handle_set_cr4(vcpu, val);
5109                         kvm_complete_insn_gp(vcpu, err);
5110                         return 1;
5111                 case 8: {
5112                                 u8 cr8_prev = kvm_get_cr8(vcpu);
5113                                 u8 cr8 = (u8)val;
5114                                 err = kvm_set_cr8(vcpu, cr8);
5115                                 kvm_complete_insn_gp(vcpu, err);
5116                                 if (irqchip_in_kernel(vcpu->kvm))
5117                                         return 1;
5118                                 if (cr8_prev <= cr8)
5119                                         return 1;
5120                                 vcpu->run->exit_reason = KVM_EXIT_SET_TPR;
5121                                 return 0;
5122                         }
5123                 }
5124                 break;
5125         case 2: /* clts */
5126                 handle_clts(vcpu);
5127                 trace_kvm_cr_write(0, kvm_read_cr0(vcpu));
5128                 skip_emulated_instruction(vcpu);
5129                 vmx_fpu_activate(vcpu);
5130                 return 1;
5131         case 1: /*mov from cr*/
5132                 switch (cr) {
5133                 case 3:
5134                         val = kvm_read_cr3(vcpu);
5135                         kvm_register_write(vcpu, reg, val);
5136                         trace_kvm_cr_read(cr, val);
5137                         skip_emulated_instruction(vcpu);
5138                         return 1;
5139                 case 8:
5140                         val = kvm_get_cr8(vcpu);
5141                         kvm_register_write(vcpu, reg, val);
5142                         trace_kvm_cr_read(cr, val);
5143                         skip_emulated_instruction(vcpu);
5144                         return 1;
5145                 }
5146                 break;
5147         case 3: /* lmsw */
5148                 val = (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f;
5149                 trace_kvm_cr_write(0, (kvm_read_cr0(vcpu) & ~0xful) | val);
5150                 kvm_lmsw(vcpu, val);
5151
5152                 skip_emulated_instruction(vcpu);
5153                 return 1;
5154         default:
5155                 break;
5156         }
5157         vcpu->run->exit_reason = 0;
5158         vcpu_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
5159                (int)(exit_qualification >> 4) & 3, cr);
5160         return 0;
5161 }
5162
5163 static int handle_dr(struct kvm_vcpu *vcpu)
5164 {
5165         unsigned long exit_qualification;
5166         int dr, reg;
5167
5168         /* Do not handle if the CPL > 0, will trigger GP on re-entry */
5169         if (!kvm_require_cpl(vcpu, 0))
5170                 return 1;
5171         dr = vmcs_readl(GUEST_DR7);
5172         if (dr & DR7_GD) {
5173                 /*
5174                  * As the vm-exit takes precedence over the debug trap, we
5175                  * need to emulate the latter, either for the host or the
5176                  * guest debugging itself.
5177                  */
5178                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
5179                         vcpu->run->debug.arch.dr6 = vcpu->arch.dr6;
5180                         vcpu->run->debug.arch.dr7 = dr;
5181                         vcpu->run->debug.arch.pc =
5182                                 vmcs_readl(GUEST_CS_BASE) +
5183                                 vmcs_readl(GUEST_RIP);
5184                         vcpu->run->debug.arch.exception = DB_VECTOR;
5185                         vcpu->run->exit_reason = KVM_EXIT_DEBUG;
5186                         return 0;
5187                 } else {
5188                         vcpu->arch.dr7 &= ~DR7_GD;
5189                         vcpu->arch.dr6 |= DR6_BD | DR6_RTM;
5190                         vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
5191                         kvm_queue_exception(vcpu, DB_VECTOR);
5192                         return 1;
5193                 }
5194         }
5195
5196         if (vcpu->guest_debug == 0) {
5197                 u32 cpu_based_vm_exec_control;
5198
5199                 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
5200                 cpu_based_vm_exec_control &= ~CPU_BASED_MOV_DR_EXITING;
5201                 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
5202
5203                 /*
5204                  * No more DR vmexits; force a reload of the debug registers
5205                  * and reenter on this instruction.  The next vmexit will
5206                  * retrieve the full state of the debug registers.
5207                  */
5208                 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_WONT_EXIT;
5209                 return 1;
5210         }
5211
5212         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5213         dr = exit_qualification & DEBUG_REG_ACCESS_NUM;
5214         reg = DEBUG_REG_ACCESS_REG(exit_qualification);
5215         if (exit_qualification & TYPE_MOV_FROM_DR) {
5216                 unsigned long val;
5217
5218                 if (kvm_get_dr(vcpu, dr, &val))
5219                         return 1;
5220                 kvm_register_write(vcpu, reg, val);
5221         } else
5222                 if (kvm_set_dr(vcpu, dr, kvm_register_readl(vcpu, reg)))
5223                         return 1;
5224
5225         skip_emulated_instruction(vcpu);
5226         return 1;
5227 }
5228
5229 static u64 vmx_get_dr6(struct kvm_vcpu *vcpu)
5230 {
5231         return vcpu->arch.dr6;
5232 }
5233
5234 static void vmx_set_dr6(struct kvm_vcpu *vcpu, unsigned long val)
5235 {
5236 }
5237
5238 static void vmx_sync_dirty_debug_regs(struct kvm_vcpu *vcpu)
5239 {
5240         u32 cpu_based_vm_exec_control;
5241
5242         get_debugreg(vcpu->arch.db[0], 0);
5243         get_debugreg(vcpu->arch.db[1], 1);
5244         get_debugreg(vcpu->arch.db[2], 2);
5245         get_debugreg(vcpu->arch.db[3], 3);
5246         get_debugreg(vcpu->arch.dr6, 6);
5247         vcpu->arch.dr7 = vmcs_readl(GUEST_DR7);
5248
5249         vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_WONT_EXIT;
5250
5251         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
5252         cpu_based_vm_exec_control |= CPU_BASED_MOV_DR_EXITING;
5253         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
5254 }
5255
5256 static void vmx_set_dr7(struct kvm_vcpu *vcpu, unsigned long val)
5257 {
5258         vmcs_writel(GUEST_DR7, val);
5259 }
5260
5261 static int handle_cpuid(struct kvm_vcpu *vcpu)
5262 {
5263         kvm_emulate_cpuid(vcpu);
5264         return 1;
5265 }
5266
5267 static int handle_rdmsr(struct kvm_vcpu *vcpu)
5268 {
5269         u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
5270         u64 data;
5271
5272         if (vmx_get_msr(vcpu, ecx, &data)) {
5273                 trace_kvm_msr_read_ex(ecx);
5274                 kvm_inject_gp(vcpu, 0);
5275                 return 1;
5276         }
5277
5278         trace_kvm_msr_read(ecx, data);
5279
5280         /* FIXME: handling of bits 32:63 of rax, rdx */
5281         vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
5282         vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
5283         skip_emulated_instruction(vcpu);
5284         return 1;
5285 }
5286
5287 static int handle_wrmsr(struct kvm_vcpu *vcpu)
5288 {
5289         struct msr_data msr;
5290         u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
5291         u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
5292                 | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
5293
5294         msr.data = data;
5295         msr.index = ecx;
5296         msr.host_initiated = false;
5297         if (kvm_set_msr(vcpu, &msr) != 0) {
5298                 trace_kvm_msr_write_ex(ecx, data);
5299                 kvm_inject_gp(vcpu, 0);
5300                 return 1;
5301         }
5302
5303         trace_kvm_msr_write(ecx, data);
5304         skip_emulated_instruction(vcpu);
5305         return 1;
5306 }
5307
5308 static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu)
5309 {
5310         kvm_make_request(KVM_REQ_EVENT, vcpu);
5311         return 1;
5312 }
5313
5314 static int handle_interrupt_window(struct kvm_vcpu *vcpu)
5315 {
5316         u32 cpu_based_vm_exec_control;
5317
5318         /* clear pending irq */
5319         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
5320         cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
5321         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
5322
5323         kvm_make_request(KVM_REQ_EVENT, vcpu);
5324
5325         ++vcpu->stat.irq_window_exits;
5326
5327         /*
5328          * If the user space waits to inject interrupts, exit as soon as
5329          * possible
5330          */
5331         if (!irqchip_in_kernel(vcpu->kvm) &&
5332             vcpu->run->request_interrupt_window &&
5333             !kvm_cpu_has_interrupt(vcpu)) {
5334                 vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
5335                 return 0;
5336         }
5337         return 1;
5338 }
5339
5340 static int handle_halt(struct kvm_vcpu *vcpu)
5341 {
5342         skip_emulated_instruction(vcpu);
5343         return kvm_emulate_halt(vcpu);
5344 }
5345
5346 static int handle_vmcall(struct kvm_vcpu *vcpu)
5347 {
5348         skip_emulated_instruction(vcpu);
5349         kvm_emulate_hypercall(vcpu);
5350         return 1;
5351 }
5352
5353 static int handle_invd(struct kvm_vcpu *vcpu)
5354 {
5355         return emulate_instruction(vcpu, 0) == EMULATE_DONE;
5356 }
5357
5358 static int handle_invlpg(struct kvm_vcpu *vcpu)
5359 {
5360         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5361
5362         kvm_mmu_invlpg(vcpu, exit_qualification);
5363         skip_emulated_instruction(vcpu);
5364         return 1;
5365 }
5366
5367 static int handle_rdpmc(struct kvm_vcpu *vcpu)
5368 {
5369         int err;
5370
5371         err = kvm_rdpmc(vcpu);
5372         kvm_complete_insn_gp(vcpu, err);
5373
5374         return 1;
5375 }
5376
5377 static int handle_wbinvd(struct kvm_vcpu *vcpu)
5378 {
5379         skip_emulated_instruction(vcpu);
5380         kvm_emulate_wbinvd(vcpu);
5381         return 1;
5382 }
5383
5384 static int handle_xsetbv(struct kvm_vcpu *vcpu)
5385 {
5386         u64 new_bv = kvm_read_edx_eax(vcpu);
5387         u32 index = kvm_register_read(vcpu, VCPU_REGS_RCX);
5388
5389         if (kvm_set_xcr(vcpu, index, new_bv) == 0)
5390                 skip_emulated_instruction(vcpu);
5391         return 1;
5392 }
5393
5394 static int handle_apic_access(struct kvm_vcpu *vcpu)
5395 {
5396         if (likely(fasteoi)) {
5397                 unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5398                 int access_type, offset;
5399
5400                 access_type = exit_qualification & APIC_ACCESS_TYPE;
5401                 offset = exit_qualification & APIC_ACCESS_OFFSET;
5402                 /*
5403                  * Sane guest uses MOV to write EOI, with written value
5404                  * not cared. So make a short-circuit here by avoiding
5405                  * heavy instruction emulation.
5406                  */
5407                 if ((access_type == TYPE_LINEAR_APIC_INST_WRITE) &&
5408                     (offset == APIC_EOI)) {
5409                         kvm_lapic_set_eoi(vcpu);
5410                         skip_emulated_instruction(vcpu);
5411                         return 1;
5412                 }
5413         }
5414         return emulate_instruction(vcpu, 0) == EMULATE_DONE;
5415 }
5416
5417 static int handle_apic_eoi_induced(struct kvm_vcpu *vcpu)
5418 {
5419         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5420         int vector = exit_qualification & 0xff;
5421
5422         /* EOI-induced VM exit is trap-like and thus no need to adjust IP */
5423         kvm_apic_set_eoi_accelerated(vcpu, vector);
5424         return 1;
5425 }
5426
5427 static int handle_apic_write(struct kvm_vcpu *vcpu)
5428 {
5429         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5430         u32 offset = exit_qualification & 0xfff;
5431
5432         /* APIC-write VM exit is trap-like and thus no need to adjust IP */
5433         kvm_apic_write_nodecode(vcpu, offset);
5434         return 1;
5435 }
5436
5437 static int handle_task_switch(struct kvm_vcpu *vcpu)
5438 {
5439         struct vcpu_vmx *vmx = to_vmx(vcpu);
5440         unsigned long exit_qualification;
5441         bool has_error_code = false;
5442         u32 error_code = 0;
5443         u16 tss_selector;
5444         int reason, type, idt_v, idt_index;
5445
5446         idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK);
5447         idt_index = (vmx->idt_vectoring_info & VECTORING_INFO_VECTOR_MASK);
5448         type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK);
5449
5450         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5451
5452         reason = (u32)exit_qualification >> 30;
5453         if (reason == TASK_SWITCH_GATE && idt_v) {
5454                 switch (type) {
5455                 case INTR_TYPE_NMI_INTR:
5456                         vcpu->arch.nmi_injected = false;
5457                         vmx_set_nmi_mask(vcpu, true);
5458                         break;
5459                 case INTR_TYPE_EXT_INTR:
5460                 case INTR_TYPE_SOFT_INTR:
5461                         kvm_clear_interrupt_queue(vcpu);
5462                         break;
5463                 case INTR_TYPE_HARD_EXCEPTION:
5464                         if (vmx->idt_vectoring_info &
5465                             VECTORING_INFO_DELIVER_CODE_MASK) {
5466                                 has_error_code = true;
5467                                 error_code =
5468                                         vmcs_read32(IDT_VECTORING_ERROR_CODE);
5469                         }
5470                         /* fall through */
5471                 case INTR_TYPE_SOFT_EXCEPTION:
5472                         kvm_clear_exception_queue(vcpu);
5473                         break;
5474                 default:
5475                         break;
5476                 }
5477         }
5478         tss_selector = exit_qualification;
5479
5480         if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION &&
5481                        type != INTR_TYPE_EXT_INTR &&
5482                        type != INTR_TYPE_NMI_INTR))
5483                 skip_emulated_instruction(vcpu);
5484
5485         if (kvm_task_switch(vcpu, tss_selector,
5486                             type == INTR_TYPE_SOFT_INTR ? idt_index : -1, reason,
5487                             has_error_code, error_code) == EMULATE_FAIL) {
5488                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
5489                 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
5490                 vcpu->run->internal.ndata = 0;
5491                 return 0;
5492         }
5493
5494         /* clear all local breakpoint enable flags */
5495         vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~0x55);
5496
5497         /*
5498          * TODO: What about debug traps on tss switch?
5499          *       Are we supposed to inject them and update dr6?
5500          */
5501
5502         return 1;
5503 }
5504
5505 static int handle_ept_violation(struct kvm_vcpu *vcpu)
5506 {
5507         unsigned long exit_qualification;
5508         gpa_t gpa;
5509         u32 error_code;
5510         int gla_validity;
5511
5512         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5513
5514         gla_validity = (exit_qualification >> 7) & 0x3;
5515         if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) {
5516                 printk(KERN_ERR "EPT: Handling EPT violation failed!\n");
5517                 printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n",
5518                         (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS),
5519                         vmcs_readl(GUEST_LINEAR_ADDRESS));
5520                 printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
5521                         (long unsigned int)exit_qualification);
5522                 vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
5523                 vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_VIOLATION;
5524                 return 0;
5525         }
5526
5527         /*
5528          * EPT violation happened while executing iret from NMI,
5529          * "blocked by NMI" bit has to be set before next VM entry.
5530          * There are errata that may cause this bit to not be set:
5531          * AAK134, BY25.
5532          */
5533         if (!(to_vmx(vcpu)->idt_vectoring_info & VECTORING_INFO_VALID_MASK) &&
5534                         cpu_has_virtual_nmis() &&
5535                         (exit_qualification & INTR_INFO_UNBLOCK_NMI))
5536                 vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI);
5537
5538         gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
5539         trace_kvm_page_fault(gpa, exit_qualification);
5540
5541         /* It is a write fault? */
5542         error_code = exit_qualification & (1U << 1);
5543         /* It is a fetch fault? */
5544         error_code |= (exit_qualification & (1U << 2)) << 2;
5545         /* ept page table is present? */
5546         error_code |= (exit_qualification >> 3) & 0x1;
5547
5548         vcpu->arch.exit_qualification = exit_qualification;
5549
5550         return kvm_mmu_page_fault(vcpu, gpa, error_code, NULL, 0);
5551 }
5552
5553 static u64 ept_rsvd_mask(u64 spte, int level)
5554 {
5555         int i;
5556         u64 mask = 0;
5557
5558         for (i = 51; i > boot_cpu_data.x86_phys_bits; i--)
5559                 mask |= (1ULL << i);
5560
5561         if (level == 4)
5562                 /* bits 7:3 reserved */
5563                 mask |= 0xf8;
5564         else if (spte & (1ULL << 7))
5565                 /*
5566                  * 1GB/2MB page, bits 29:12 or 20:12 reserved respectively,
5567                  * level == 1 if the hypervisor is using the ignored bit 7.
5568                  */
5569                 mask |= (PAGE_SIZE << ((level - 1) * 9)) - PAGE_SIZE;
5570         else if (level > 1)
5571                 /* bits 6:3 reserved */
5572                 mask |= 0x78;
5573
5574         return mask;
5575 }
5576
5577 static void ept_misconfig_inspect_spte(struct kvm_vcpu *vcpu, u64 spte,
5578                                        int level)
5579 {
5580         printk(KERN_ERR "%s: spte 0x%llx level %d\n", __func__, spte, level);
5581
5582         /* 010b (write-only) */
5583         WARN_ON((spte & 0x7) == 0x2);
5584
5585         /* 110b (write/execute) */
5586         WARN_ON((spte & 0x7) == 0x6);
5587
5588         /* 100b (execute-only) and value not supported by logical processor */
5589         if (!cpu_has_vmx_ept_execute_only())
5590                 WARN_ON((spte & 0x7) == 0x4);
5591
5592         /* not 000b */
5593         if ((spte & 0x7)) {
5594                 u64 rsvd_bits = spte & ept_rsvd_mask(spte, level);
5595
5596                 if (rsvd_bits != 0) {
5597                         printk(KERN_ERR "%s: rsvd_bits = 0x%llx\n",
5598                                          __func__, rsvd_bits);
5599                         WARN_ON(1);
5600                 }
5601
5602                 /* bits 5:3 are _not_ reserved for large page or leaf page */
5603                 if ((rsvd_bits & 0x38) == 0) {
5604                         u64 ept_mem_type = (spte & 0x38) >> 3;
5605
5606                         if (ept_mem_type == 2 || ept_mem_type == 3 ||
5607                             ept_mem_type == 7) {
5608                                 printk(KERN_ERR "%s: ept_mem_type=0x%llx\n",
5609                                                 __func__, ept_mem_type);
5610                                 WARN_ON(1);
5611                         }
5612                 }
5613         }
5614 }
5615
5616 static int handle_ept_misconfig(struct kvm_vcpu *vcpu)
5617 {
5618         u64 sptes[4];
5619         int nr_sptes, i, ret;
5620         gpa_t gpa;
5621
5622         gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
5623         if (!kvm_io_bus_write(vcpu->kvm, KVM_FAST_MMIO_BUS, gpa, 0, NULL)) {
5624                 skip_emulated_instruction(vcpu);
5625                 return 1;
5626         }
5627
5628         ret = handle_mmio_page_fault_common(vcpu, gpa, true);
5629         if (likely(ret == RET_MMIO_PF_EMULATE))
5630                 return x86_emulate_instruction(vcpu, gpa, 0, NULL, 0) ==
5631                                               EMULATE_DONE;
5632
5633         if (unlikely(ret == RET_MMIO_PF_INVALID))
5634                 return kvm_mmu_page_fault(vcpu, gpa, 0, NULL, 0);
5635
5636         if (unlikely(ret == RET_MMIO_PF_RETRY))
5637                 return 1;
5638
5639         /* It is the real ept misconfig */
5640         printk(KERN_ERR "EPT: Misconfiguration.\n");
5641         printk(KERN_ERR "EPT: GPA: 0x%llx\n", gpa);
5642
5643         nr_sptes = kvm_mmu_get_spte_hierarchy(vcpu, gpa, sptes);
5644
5645         for (i = PT64_ROOT_LEVEL; i > PT64_ROOT_LEVEL - nr_sptes; --i)
5646                 ept_misconfig_inspect_spte(vcpu, sptes[i-1], i);
5647
5648         vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
5649         vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_MISCONFIG;
5650
5651         return 0;
5652 }
5653
5654 static int handle_nmi_window(struct kvm_vcpu *vcpu)
5655 {
5656         u32 cpu_based_vm_exec_control;
5657
5658         /* clear pending NMI */
5659         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
5660         cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
5661         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
5662         ++vcpu->stat.nmi_window_exits;
5663         kvm_make_request(KVM_REQ_EVENT, vcpu);
5664
5665         return 1;
5666 }
5667
5668 static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
5669 {
5670         struct vcpu_vmx *vmx = to_vmx(vcpu);
5671         enum emulation_result err = EMULATE_DONE;
5672         int ret = 1;
5673         u32 cpu_exec_ctrl;
5674         bool intr_window_requested;
5675         unsigned count = 130;
5676
5677         cpu_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
5678         intr_window_requested = cpu_exec_ctrl & CPU_BASED_VIRTUAL_INTR_PENDING;
5679
5680         while (vmx->emulation_required && count-- != 0) {
5681                 if (intr_window_requested && vmx_interrupt_allowed(vcpu))
5682                         return handle_interrupt_window(&vmx->vcpu);
5683
5684                 if (test_bit(KVM_REQ_EVENT, &vcpu->requests))
5685                         return 1;
5686
5687                 err = emulate_instruction(vcpu, EMULTYPE_NO_REEXECUTE);
5688
5689                 if (err == EMULATE_USER_EXIT) {
5690                         ++vcpu->stat.mmio_exits;
5691                         ret = 0;
5692                         goto out;
5693                 }
5694
5695                 if (err != EMULATE_DONE) {
5696                         vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
5697                         vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
5698                         vcpu->run->internal.ndata = 0;
5699                         return 0;
5700                 }
5701
5702                 if (vcpu->arch.halt_request) {
5703                         vcpu->arch.halt_request = 0;
5704                         ret = kvm_emulate_halt(vcpu);
5705                         goto out;
5706                 }
5707
5708                 if (signal_pending(current))
5709                         goto out;
5710                 if (need_resched())
5711                         schedule();
5712         }
5713
5714 out:
5715         return ret;
5716 }
5717
5718 static int __grow_ple_window(int val)
5719 {
5720         if (ple_window_grow < 1)
5721                 return ple_window;
5722
5723         val = min(val, ple_window_actual_max);
5724
5725         if (ple_window_grow < ple_window)
5726                 val *= ple_window_grow;
5727         else
5728                 val += ple_window_grow;
5729
5730         return val;
5731 }
5732
5733 static int __shrink_ple_window(int val, int modifier, int minimum)
5734 {
5735         if (modifier < 1)
5736                 return ple_window;
5737
5738         if (modifier < ple_window)
5739                 val /= modifier;
5740         else
5741                 val -= modifier;
5742
5743         return max(val, minimum);
5744 }
5745
5746 static void grow_ple_window(struct kvm_vcpu *vcpu)
5747 {
5748         struct vcpu_vmx *vmx = to_vmx(vcpu);
5749         int old = vmx->ple_window;
5750
5751         vmx->ple_window = __grow_ple_window(old);
5752
5753         if (vmx->ple_window != old)
5754                 vmx->ple_window_dirty = true;
5755
5756         trace_kvm_ple_window_grow(vcpu->vcpu_id, vmx->ple_window, old);
5757 }
5758
5759 static void shrink_ple_window(struct kvm_vcpu *vcpu)
5760 {
5761         struct vcpu_vmx *vmx = to_vmx(vcpu);
5762         int old = vmx->ple_window;
5763
5764         vmx->ple_window = __shrink_ple_window(old,
5765                                               ple_window_shrink, ple_window);
5766
5767         if (vmx->ple_window != old)
5768                 vmx->ple_window_dirty = true;
5769
5770         trace_kvm_ple_window_shrink(vcpu->vcpu_id, vmx->ple_window, old);
5771 }
5772
5773 /*
5774  * ple_window_actual_max is computed to be one grow_ple_window() below
5775  * ple_window_max. (See __grow_ple_window for the reason.)
5776  * This prevents overflows, because ple_window_max is int.
5777  * ple_window_max effectively rounded down to a multiple of ple_window_grow in
5778  * this process.
5779  * ple_window_max is also prevented from setting vmx->ple_window < ple_window.
5780  */
5781 static void update_ple_window_actual_max(void)
5782 {
5783         ple_window_actual_max =
5784                         __shrink_ple_window(max(ple_window_max, ple_window),
5785                                             ple_window_grow, INT_MIN);
5786 }
5787
5788 /*
5789  * Indicate a busy-waiting vcpu in spinlock. We do not enable the PAUSE
5790  * exiting, so only get here on cpu with PAUSE-Loop-Exiting.
5791  */
5792 static int handle_pause(struct kvm_vcpu *vcpu)
5793 {
5794         if (ple_gap)
5795                 grow_ple_window(vcpu);
5796
5797         skip_emulated_instruction(vcpu);
5798         kvm_vcpu_on_spin(vcpu);
5799
5800         return 1;
5801 }
5802
5803 static int handle_nop(struct kvm_vcpu *vcpu)
5804 {
5805         skip_emulated_instruction(vcpu);
5806         return 1;
5807 }
5808
5809 static int handle_mwait(struct kvm_vcpu *vcpu)
5810 {
5811         printk_once(KERN_WARNING "kvm: MWAIT instruction emulated as NOP!\n");
5812         return handle_nop(vcpu);
5813 }
5814
5815 static int handle_monitor(struct kvm_vcpu *vcpu)
5816 {
5817         printk_once(KERN_WARNING "kvm: MONITOR instruction emulated as NOP!\n");
5818         return handle_nop(vcpu);
5819 }
5820
5821 /*
5822  * To run an L2 guest, we need a vmcs02 based on the L1-specified vmcs12.
5823  * We could reuse a single VMCS for all the L2 guests, but we also want the
5824  * option to allocate a separate vmcs02 for each separate loaded vmcs12 - this
5825  * allows keeping them loaded on the processor, and in the future will allow
5826  * optimizations where prepare_vmcs02 doesn't need to set all the fields on
5827  * every entry if they never change.
5828  * So we keep, in vmx->nested.vmcs02_pool, a cache of size VMCS02_POOL_SIZE
5829  * (>=0) with a vmcs02 for each recently loaded vmcs12s, most recent first.
5830  *
5831  * The following functions allocate and free a vmcs02 in this pool.
5832  */
5833
5834 /* Get a VMCS from the pool to use as vmcs02 for the current vmcs12. */
5835 static struct loaded_vmcs *nested_get_current_vmcs02(struct vcpu_vmx *vmx)
5836 {
5837         struct vmcs02_list *item;
5838         list_for_each_entry(item, &vmx->nested.vmcs02_pool, list)
5839                 if (item->vmptr == vmx->nested.current_vmptr) {
5840                         list_move(&item->list, &vmx->nested.vmcs02_pool);
5841                         return &item->vmcs02;
5842                 }
5843
5844         if (vmx->nested.vmcs02_num >= max(VMCS02_POOL_SIZE, 1)) {
5845                 /* Recycle the least recently used VMCS. */
5846                 item = list_entry(vmx->nested.vmcs02_pool.prev,
5847                         struct vmcs02_list, list);
5848                 item->vmptr = vmx->nested.current_vmptr;
5849                 list_move(&item->list, &vmx->nested.vmcs02_pool);
5850                 return &item->vmcs02;
5851         }
5852
5853         /* Create a new VMCS */
5854         item = kmalloc(sizeof(struct vmcs02_list), GFP_KERNEL);
5855         if (!item)
5856                 return NULL;
5857         item->vmcs02.vmcs = alloc_vmcs();
5858         if (!item->vmcs02.vmcs) {
5859                 kfree(item);
5860                 return NULL;
5861         }
5862         loaded_vmcs_init(&item->vmcs02);
5863         item->vmptr = vmx->nested.current_vmptr;
5864         list_add(&(item->list), &(vmx->nested.vmcs02_pool));
5865         vmx->nested.vmcs02_num++;
5866         return &item->vmcs02;
5867 }
5868
5869 /* Free and remove from pool a vmcs02 saved for a vmcs12 (if there is one) */
5870 static void nested_free_vmcs02(struct vcpu_vmx *vmx, gpa_t vmptr)
5871 {
5872         struct vmcs02_list *item;
5873         list_for_each_entry(item, &vmx->nested.vmcs02_pool, list)
5874                 if (item->vmptr == vmptr) {
5875                         free_loaded_vmcs(&item->vmcs02);
5876                         list_del(&item->list);
5877                         kfree(item);
5878                         vmx->nested.vmcs02_num--;
5879                         return;
5880                 }
5881 }
5882
5883 /*
5884  * Free all VMCSs saved for this vcpu, except the one pointed by
5885  * vmx->loaded_vmcs. We must be running L1, so vmx->loaded_vmcs
5886  * must be &vmx->vmcs01.
5887  */
5888 static void nested_free_all_saved_vmcss(struct vcpu_vmx *vmx)
5889 {
5890         struct vmcs02_list *item, *n;
5891
5892         WARN_ON(vmx->loaded_vmcs != &vmx->vmcs01);
5893         list_for_each_entry_safe(item, n, &vmx->nested.vmcs02_pool, list) {
5894                 /*
5895                  * Something will leak if the above WARN triggers.  Better than
5896                  * a use-after-free.
5897                  */
5898                 if (vmx->loaded_vmcs == &item->vmcs02)
5899                         continue;
5900
5901                 free_loaded_vmcs(&item->vmcs02);
5902                 list_del(&item->list);
5903                 kfree(item);
5904                 vmx->nested.vmcs02_num--;
5905         }
5906 }
5907
5908 /*
5909  * The following 3 functions, nested_vmx_succeed()/failValid()/failInvalid(),
5910  * set the success or error code of an emulated VMX instruction, as specified
5911  * by Vol 2B, VMX Instruction Reference, "Conventions".
5912  */
5913 static void nested_vmx_succeed(struct kvm_vcpu *vcpu)
5914 {
5915         vmx_set_rflags(vcpu, vmx_get_rflags(vcpu)
5916                         & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
5917                             X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF));
5918 }
5919
5920 static void nested_vmx_failInvalid(struct kvm_vcpu *vcpu)
5921 {
5922         vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
5923                         & ~(X86_EFLAGS_PF | X86_EFLAGS_AF | X86_EFLAGS_ZF |
5924                             X86_EFLAGS_SF | X86_EFLAGS_OF))
5925                         | X86_EFLAGS_CF);
5926 }
5927
5928 static void nested_vmx_failValid(struct kvm_vcpu *vcpu,
5929                                         u32 vm_instruction_error)
5930 {
5931         if (to_vmx(vcpu)->nested.current_vmptr == -1ull) {
5932                 /*
5933                  * failValid writes the error number to the current VMCS, which
5934                  * can't be done there isn't a current VMCS.
5935                  */
5936                 nested_vmx_failInvalid(vcpu);
5937                 return;
5938         }
5939         vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
5940                         & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
5941                             X86_EFLAGS_SF | X86_EFLAGS_OF))
5942                         | X86_EFLAGS_ZF);
5943         get_vmcs12(vcpu)->vm_instruction_error = vm_instruction_error;
5944         /*
5945          * We don't need to force a shadow sync because
5946          * VM_INSTRUCTION_ERROR is not shadowed
5947          */
5948 }
5949
5950 static enum hrtimer_restart vmx_preemption_timer_fn(struct hrtimer *timer)
5951 {
5952         struct vcpu_vmx *vmx =
5953                 container_of(timer, struct vcpu_vmx, nested.preemption_timer);
5954
5955         vmx->nested.preemption_timer_expired = true;
5956         kvm_make_request(KVM_REQ_EVENT, &vmx->vcpu);
5957         kvm_vcpu_kick(&vmx->vcpu);
5958
5959         return HRTIMER_NORESTART;
5960 }
5961
5962 /*
5963  * Decode the memory-address operand of a vmx instruction, as recorded on an
5964  * exit caused by such an instruction (run by a guest hypervisor).
5965  * On success, returns 0. When the operand is invalid, returns 1 and throws
5966  * #UD or #GP.
5967  */
5968 static int get_vmx_mem_address(struct kvm_vcpu *vcpu,
5969                                  unsigned long exit_qualification,
5970                                  u32 vmx_instruction_info, gva_t *ret)
5971 {
5972         /*
5973          * According to Vol. 3B, "Information for VM Exits Due to Instruction
5974          * Execution", on an exit, vmx_instruction_info holds most of the
5975          * addressing components of the operand. Only the displacement part
5976          * is put in exit_qualification (see 3B, "Basic VM-Exit Information").
5977          * For how an actual address is calculated from all these components,
5978          * refer to Vol. 1, "Operand Addressing".
5979          */
5980         int  scaling = vmx_instruction_info & 3;
5981         int  addr_size = (vmx_instruction_info >> 7) & 7;
5982         bool is_reg = vmx_instruction_info & (1u << 10);
5983         int  seg_reg = (vmx_instruction_info >> 15) & 7;
5984         int  index_reg = (vmx_instruction_info >> 18) & 0xf;
5985         bool index_is_valid = !(vmx_instruction_info & (1u << 22));
5986         int  base_reg       = (vmx_instruction_info >> 23) & 0xf;
5987         bool base_is_valid  = !(vmx_instruction_info & (1u << 27));
5988
5989         if (is_reg) {
5990                 kvm_queue_exception(vcpu, UD_VECTOR);
5991                 return 1;
5992         }
5993
5994         /* Addr = segment_base + offset */
5995         /* offset = base + [index * scale] + displacement */
5996         *ret = vmx_get_segment_base(vcpu, seg_reg);
5997         if (base_is_valid)
5998                 *ret += kvm_register_read(vcpu, base_reg);
5999         if (index_is_valid)
6000                 *ret += kvm_register_read(vcpu, index_reg)<<scaling;
6001         *ret += exit_qualification; /* holds the displacement */
6002
6003         if (addr_size == 1) /* 32 bit */
6004                 *ret &= 0xffffffff;
6005
6006         /*
6007          * TODO: throw #GP (and return 1) in various cases that the VM*
6008          * instructions require it - e.g., offset beyond segment limit,
6009          * unusable or unreadable/unwritable segment, non-canonical 64-bit
6010          * address, and so on. Currently these are not checked.
6011          */
6012         return 0;
6013 }
6014
6015 /*
6016  * This function performs the various checks including
6017  * - if it's 4KB aligned
6018  * - No bits beyond the physical address width are set
6019  * - Returns 0 on success or else 1
6020  * (Intel SDM Section 30.3)
6021  */
6022 static int nested_vmx_check_vmptr(struct kvm_vcpu *vcpu, int exit_reason,
6023                                   gpa_t *vmpointer)
6024 {
6025         gva_t gva;
6026         gpa_t vmptr;
6027         struct x86_exception e;
6028         struct page *page;
6029         struct vcpu_vmx *vmx = to_vmx(vcpu);
6030         int maxphyaddr = cpuid_maxphyaddr(vcpu);
6031
6032         if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),
6033                         vmcs_read32(VMX_INSTRUCTION_INFO), &gva))
6034                 return 1;
6035
6036         if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &vmptr,
6037                                 sizeof(vmptr), &e)) {
6038                 kvm_inject_page_fault(vcpu, &e);
6039                 return 1;
6040         }
6041
6042         switch (exit_reason) {
6043         case EXIT_REASON_VMON:
6044                 /*
6045                  * SDM 3: 24.11.5
6046                  * The first 4 bytes of VMXON region contain the supported
6047                  * VMCS revision identifier
6048                  *
6049                  * Note - IA32_VMX_BASIC[48] will never be 1
6050                  * for the nested case;
6051                  * which replaces physical address width with 32
6052                  *
6053                  */
6054                 if (!PAGE_ALIGNED(vmptr) || (vmptr >> maxphyaddr)) {
6055                         nested_vmx_failInvalid(vcpu);
6056                         skip_emulated_instruction(vcpu);
6057                         return 1;
6058                 }
6059
6060                 page = nested_get_page(vcpu, vmptr);
6061                 if (page == NULL ||
6062                     *(u32 *)kmap(page) != VMCS12_REVISION) {
6063                         nested_vmx_failInvalid(vcpu);
6064                         kunmap(page);
6065                         skip_emulated_instruction(vcpu);
6066                         return 1;
6067                 }
6068                 kunmap(page);
6069                 vmx->nested.vmxon_ptr = vmptr;
6070                 break;
6071         case EXIT_REASON_VMCLEAR:
6072                 if (!PAGE_ALIGNED(vmptr) || (vmptr >> maxphyaddr)) {
6073                         nested_vmx_failValid(vcpu,
6074                                              VMXERR_VMCLEAR_INVALID_ADDRESS);
6075                         skip_emulated_instruction(vcpu);
6076                         return 1;
6077                 }
6078
6079                 if (vmptr == vmx->nested.vmxon_ptr) {
6080                         nested_vmx_failValid(vcpu,
6081                                              VMXERR_VMCLEAR_VMXON_POINTER);
6082                         skip_emulated_instruction(vcpu);
6083                         return 1;
6084                 }
6085                 break;
6086         case EXIT_REASON_VMPTRLD:
6087                 if (!PAGE_ALIGNED(vmptr) || (vmptr >> maxphyaddr)) {
6088                         nested_vmx_failValid(vcpu,
6089                                              VMXERR_VMPTRLD_INVALID_ADDRESS);
6090                         skip_emulated_instruction(vcpu);
6091                         return 1;
6092                 }
6093
6094                 if (vmptr == vmx->nested.vmxon_ptr) {
6095                         nested_vmx_failValid(vcpu,
6096                                              VMXERR_VMCLEAR_VMXON_POINTER);
6097                         skip_emulated_instruction(vcpu);
6098                         return 1;
6099                 }
6100                 break;
6101         default:
6102                 return 1; /* shouldn't happen */
6103         }
6104
6105         if (vmpointer)
6106                 *vmpointer = vmptr;
6107         return 0;
6108 }
6109
6110 /*
6111  * Emulate the VMXON instruction.
6112  * Currently, we just remember that VMX is active, and do not save or even
6113  * inspect the argument to VMXON (the so-called "VMXON pointer") because we
6114  * do not currently need to store anything in that guest-allocated memory
6115  * region. Consequently, VMCLEAR and VMPTRLD also do not verify that the their
6116  * argument is different from the VMXON pointer (which the spec says they do).
6117  */
6118 static int handle_vmon(struct kvm_vcpu *vcpu)
6119 {
6120         struct kvm_segment cs;
6121         struct vcpu_vmx *vmx = to_vmx(vcpu);
6122         struct vmcs *shadow_vmcs;
6123         const u64 VMXON_NEEDED_FEATURES = FEATURE_CONTROL_LOCKED
6124                 | FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX;
6125
6126         /* The Intel VMX Instruction Reference lists a bunch of bits that
6127          * are prerequisite to running VMXON, most notably cr4.VMXE must be
6128          * set to 1 (see vmx_set_cr4() for when we allow the guest to set this).
6129          * Otherwise, we should fail with #UD. We test these now:
6130          */
6131         if (!kvm_read_cr4_bits(vcpu, X86_CR4_VMXE) ||
6132             !kvm_read_cr0_bits(vcpu, X86_CR0_PE) ||
6133             (vmx_get_rflags(vcpu) & X86_EFLAGS_VM)) {
6134                 kvm_queue_exception(vcpu, UD_VECTOR);
6135                 return 1;
6136         }
6137
6138         vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
6139         if (is_long_mode(vcpu) && !cs.l) {
6140                 kvm_queue_exception(vcpu, UD_VECTOR);
6141                 return 1;
6142         }
6143
6144         if (vmx_get_cpl(vcpu)) {
6145                 kvm_inject_gp(vcpu, 0);
6146                 return 1;
6147         }
6148
6149         if (nested_vmx_check_vmptr(vcpu, EXIT_REASON_VMON, NULL))
6150                 return 1;
6151
6152         if (vmx->nested.vmxon) {
6153                 nested_vmx_failValid(vcpu, VMXERR_VMXON_IN_VMX_ROOT_OPERATION);
6154                 skip_emulated_instruction(vcpu);
6155                 return 1;
6156         }
6157
6158         if ((vmx->nested.msr_ia32_feature_control & VMXON_NEEDED_FEATURES)
6159                         != VMXON_NEEDED_FEATURES) {
6160                 kvm_inject_gp(vcpu, 0);
6161                 return 1;
6162         }
6163
6164         if (enable_shadow_vmcs) {
6165                 shadow_vmcs = alloc_vmcs();
6166                 if (!shadow_vmcs)
6167                         return -ENOMEM;
6168                 /* mark vmcs as shadow */
6169                 shadow_vmcs->revision_id |= (1u << 31);
6170                 /* init shadow vmcs */
6171                 vmcs_clear(shadow_vmcs);
6172                 vmx->nested.current_shadow_vmcs = shadow_vmcs;
6173         }
6174
6175         INIT_LIST_HEAD(&(vmx->nested.vmcs02_pool));
6176         vmx->nested.vmcs02_num = 0;
6177
6178         hrtimer_init(&vmx->nested.preemption_timer, CLOCK_MONOTONIC,
6179                      HRTIMER_MODE_REL);
6180         vmx->nested.preemption_timer.function = vmx_preemption_timer_fn;
6181
6182         vmx->nested.vmxon = true;
6183
6184         skip_emulated_instruction(vcpu);
6185         nested_vmx_succeed(vcpu);
6186         return 1;
6187 }
6188
6189 /*
6190  * Intel's VMX Instruction Reference specifies a common set of prerequisites
6191  * for running VMX instructions (except VMXON, whose prerequisites are
6192  * slightly different). It also specifies what exception to inject otherwise.
6193  */
6194 static int nested_vmx_check_permission(struct kvm_vcpu *vcpu)
6195 {
6196         struct kvm_segment cs;
6197         struct vcpu_vmx *vmx = to_vmx(vcpu);
6198
6199         if (!vmx->nested.vmxon) {
6200                 kvm_queue_exception(vcpu, UD_VECTOR);
6201                 return 0;
6202         }
6203
6204         vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
6205         if ((vmx_get_rflags(vcpu) & X86_EFLAGS_VM) ||
6206             (is_long_mode(vcpu) && !cs.l)) {
6207                 kvm_queue_exception(vcpu, UD_VECTOR);
6208                 return 0;
6209         }
6210
6211         if (vmx_get_cpl(vcpu)) {
6212                 kvm_inject_gp(vcpu, 0);
6213                 return 0;
6214         }
6215
6216         return 1;
6217 }
6218
6219 static inline void nested_release_vmcs12(struct vcpu_vmx *vmx)
6220 {
6221         u32 exec_control;
6222         if (vmx->nested.current_vmptr == -1ull)
6223                 return;
6224
6225         /* current_vmptr and current_vmcs12 are always set/reset together */
6226         if (WARN_ON(vmx->nested.current_vmcs12 == NULL))
6227                 return;
6228
6229         if (enable_shadow_vmcs) {
6230                 /* copy to memory all shadowed fields in case
6231                    they were modified */
6232                 copy_shadow_to_vmcs12(vmx);
6233                 vmx->nested.sync_shadow_vmcs = false;
6234                 exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
6235                 exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS;
6236                 vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
6237                 vmcs_write64(VMCS_LINK_POINTER, -1ull);
6238         }
6239         kunmap(vmx->nested.current_vmcs12_page);
6240         nested_release_page(vmx->nested.current_vmcs12_page);
6241         vmx->nested.current_vmptr = -1ull;
6242         vmx->nested.current_vmcs12 = NULL;
6243 }
6244
6245 /*
6246  * Free whatever needs to be freed from vmx->nested when L1 goes down, or
6247  * just stops using VMX.
6248  */
6249 static void free_nested(struct vcpu_vmx *vmx)
6250 {
6251         if (!vmx->nested.vmxon)
6252                 return;
6253
6254         vmx->nested.vmxon = false;
6255         nested_release_vmcs12(vmx);
6256         if (enable_shadow_vmcs)
6257                 free_vmcs(vmx->nested.current_shadow_vmcs);
6258         /* Unpin physical memory we referred to in current vmcs02 */
6259         if (vmx->nested.apic_access_page) {
6260                 nested_release_page(vmx->nested.apic_access_page);
6261                 vmx->nested.apic_access_page = NULL;
6262         }
6263         if (vmx->nested.virtual_apic_page) {
6264                 nested_release_page(vmx->nested.virtual_apic_page);
6265                 vmx->nested.virtual_apic_page = NULL;
6266         }
6267
6268         nested_free_all_saved_vmcss(vmx);
6269 }
6270
6271 /* Emulate the VMXOFF instruction */
6272 static int handle_vmoff(struct kvm_vcpu *vcpu)
6273 {
6274         if (!nested_vmx_check_permission(vcpu))
6275                 return 1;
6276         free_nested(to_vmx(vcpu));
6277         skip_emulated_instruction(vcpu);
6278         nested_vmx_succeed(vcpu);
6279         return 1;
6280 }
6281
6282 /* Emulate the VMCLEAR instruction */
6283 static int handle_vmclear(struct kvm_vcpu *vcpu)
6284 {
6285         struct vcpu_vmx *vmx = to_vmx(vcpu);
6286         gpa_t vmptr;
6287         struct vmcs12 *vmcs12;
6288         struct page *page;
6289
6290         if (!nested_vmx_check_permission(vcpu))
6291                 return 1;
6292
6293         if (nested_vmx_check_vmptr(vcpu, EXIT_REASON_VMCLEAR, &vmptr))
6294                 return 1;
6295
6296         if (vmptr == vmx->nested.current_vmptr)
6297                 nested_release_vmcs12(vmx);
6298
6299         page = nested_get_page(vcpu, vmptr);
6300         if (page == NULL) {
6301                 /*
6302                  * For accurate processor emulation, VMCLEAR beyond available
6303                  * physical memory should do nothing at all. However, it is
6304                  * possible that a nested vmx bug, not a guest hypervisor bug,
6305                  * resulted in this case, so let's shut down before doing any
6306                  * more damage:
6307                  */
6308                 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
6309                 return 1;
6310         }
6311         vmcs12 = kmap(page);
6312         vmcs12->launch_state = 0;
6313         kunmap(page);
6314         nested_release_page(page);
6315
6316         nested_free_vmcs02(vmx, vmptr);
6317
6318         skip_emulated_instruction(vcpu);
6319         nested_vmx_succeed(vcpu);
6320         return 1;
6321 }
6322
6323 static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch);
6324
6325 /* Emulate the VMLAUNCH instruction */
6326 static int handle_vmlaunch(struct kvm_vcpu *vcpu)
6327 {
6328         return nested_vmx_run(vcpu, true);
6329 }
6330
6331 /* Emulate the VMRESUME instruction */
6332 static int handle_vmresume(struct kvm_vcpu *vcpu)
6333 {
6334
6335         return nested_vmx_run(vcpu, false);
6336 }
6337
6338 enum vmcs_field_type {
6339         VMCS_FIELD_TYPE_U16 = 0,
6340         VMCS_FIELD_TYPE_U64 = 1,
6341         VMCS_FIELD_TYPE_U32 = 2,
6342         VMCS_FIELD_TYPE_NATURAL_WIDTH = 3
6343 };
6344
6345 static inline int vmcs_field_type(unsigned long field)
6346 {
6347         if (0x1 & field)        /* the *_HIGH fields are all 32 bit */
6348                 return VMCS_FIELD_TYPE_U32;
6349         return (field >> 13) & 0x3 ;
6350 }
6351
6352 static inline int vmcs_field_readonly(unsigned long field)
6353 {
6354         return (((field >> 10) & 0x3) == 1);
6355 }
6356
6357 /*
6358  * Read a vmcs12 field. Since these can have varying lengths and we return
6359  * one type, we chose the biggest type (u64) and zero-extend the return value
6360  * to that size. Note that the caller, handle_vmread, might need to use only
6361  * some of the bits we return here (e.g., on 32-bit guests, only 32 bits of
6362  * 64-bit fields are to be returned).
6363  */
6364 static inline bool vmcs12_read_any(struct kvm_vcpu *vcpu,
6365                                         unsigned long field, u64 *ret)
6366 {
6367         short offset = vmcs_field_to_offset(field);
6368         char *p;
6369
6370         if (offset < 0)
6371                 return 0;
6372
6373         p = ((char *)(get_vmcs12(vcpu))) + offset;
6374
6375         switch (vmcs_field_type(field)) {
6376         case VMCS_FIELD_TYPE_NATURAL_WIDTH:
6377                 *ret = *((natural_width *)p);
6378                 return 1;
6379         case VMCS_FIELD_TYPE_U16:
6380                 *ret = *((u16 *)p);
6381                 return 1;
6382         case VMCS_FIELD_TYPE_U32:
6383                 *ret = *((u32 *)p);
6384                 return 1;
6385         case VMCS_FIELD_TYPE_U64:
6386                 *ret = *((u64 *)p);
6387                 return 1;
6388         default:
6389                 return 0; /* can never happen. */
6390         }
6391 }
6392
6393
6394 static inline bool vmcs12_write_any(struct kvm_vcpu *vcpu,
6395                                     unsigned long field, u64 field_value){
6396         short offset = vmcs_field_to_offset(field);
6397         char *p = ((char *) get_vmcs12(vcpu)) + offset;
6398         if (offset < 0)
6399                 return false;
6400
6401         switch (vmcs_field_type(field)) {
6402         case VMCS_FIELD_TYPE_U16:
6403                 *(u16 *)p = field_value;
6404                 return true;
6405         case VMCS_FIELD_TYPE_U32:
6406                 *(u32 *)p = field_value;
6407                 return true;
6408         case VMCS_FIELD_TYPE_U64:
6409                 *(u64 *)p = field_value;
6410                 return true;
6411         case VMCS_FIELD_TYPE_NATURAL_WIDTH:
6412                 *(natural_width *)p = field_value;
6413                 return true;
6414         default:
6415                 return false; /* can never happen. */
6416         }
6417
6418 }
6419
6420 static void copy_shadow_to_vmcs12(struct vcpu_vmx *vmx)
6421 {
6422         int i;
6423         unsigned long field;
6424         u64 field_value;
6425         struct vmcs *shadow_vmcs = vmx->nested.current_shadow_vmcs;
6426         const unsigned long *fields = shadow_read_write_fields;
6427         const int num_fields = max_shadow_read_write_fields;
6428
6429         vmcs_load(shadow_vmcs);
6430
6431         for (i = 0; i < num_fields; i++) {
6432                 field = fields[i];
6433                 switch (vmcs_field_type(field)) {
6434                 case VMCS_FIELD_TYPE_U16:
6435                         field_value = vmcs_read16(field);
6436                         break;
6437                 case VMCS_FIELD_TYPE_U32:
6438                         field_value = vmcs_read32(field);
6439                         break;
6440                 case VMCS_FIELD_TYPE_U64:
6441                         field_value = vmcs_read64(field);
6442                         break;
6443                 case VMCS_FIELD_TYPE_NATURAL_WIDTH:
6444                         field_value = vmcs_readl(field);
6445                         break;
6446                 }
6447                 vmcs12_write_any(&vmx->vcpu, field, field_value);
6448         }
6449
6450         vmcs_clear(shadow_vmcs);
6451         vmcs_load(vmx->loaded_vmcs->vmcs);
6452 }
6453
6454 static void copy_vmcs12_to_shadow(struct vcpu_vmx *vmx)
6455 {
6456         const unsigned long *fields[] = {
6457                 shadow_read_write_fields,
6458                 shadow_read_only_fields
6459         };
6460         const int max_fields[] = {
6461                 max_shadow_read_write_fields,
6462                 max_shadow_read_only_fields
6463         };
6464         int i, q;
6465         unsigned long field;
6466         u64 field_value = 0;
6467         struct vmcs *shadow_vmcs = vmx->nested.current_shadow_vmcs;
6468
6469         vmcs_load(shadow_vmcs);
6470
6471         for (q = 0; q < ARRAY_SIZE(fields); q++) {
6472                 for (i = 0; i < max_fields[q]; i++) {
6473                         field = fields[q][i];
6474                         vmcs12_read_any(&vmx->vcpu, field, &field_value);
6475
6476                         switch (vmcs_field_type(field)) {
6477                         case VMCS_FIELD_TYPE_U16:
6478                                 vmcs_write16(field, (u16)field_value);
6479                                 break;
6480                         case VMCS_FIELD_TYPE_U32:
6481                                 vmcs_write32(field, (u32)field_value);
6482                                 break;
6483                         case VMCS_FIELD_TYPE_U64:
6484                                 vmcs_write64(field, (u64)field_value);
6485                                 break;
6486                         case VMCS_FIELD_TYPE_NATURAL_WIDTH:
6487                                 vmcs_writel(field, (long)field_value);
6488                                 break;
6489                         }
6490                 }
6491         }
6492
6493         vmcs_clear(shadow_vmcs);
6494         vmcs_load(vmx->loaded_vmcs->vmcs);
6495 }
6496
6497 /*
6498  * VMX instructions which assume a current vmcs12 (i.e., that VMPTRLD was
6499  * used before) all generate the same failure when it is missing.
6500  */
6501 static int nested_vmx_check_vmcs12(struct kvm_vcpu *vcpu)
6502 {
6503         struct vcpu_vmx *vmx = to_vmx(vcpu);
6504         if (vmx->nested.current_vmptr == -1ull) {
6505                 nested_vmx_failInvalid(vcpu);
6506                 skip_emulated_instruction(vcpu);
6507                 return 0;
6508         }
6509         return 1;
6510 }
6511
6512 static int handle_vmread(struct kvm_vcpu *vcpu)
6513 {
6514         unsigned long field;
6515         u64 field_value;
6516         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
6517         u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
6518         gva_t gva = 0;
6519
6520         if (!nested_vmx_check_permission(vcpu) ||
6521             !nested_vmx_check_vmcs12(vcpu))
6522                 return 1;
6523
6524         /* Decode instruction info and find the field to read */
6525         field = kvm_register_readl(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
6526         /* Read the field, zero-extended to a u64 field_value */
6527         if (!vmcs12_read_any(vcpu, field, &field_value)) {
6528                 nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
6529                 skip_emulated_instruction(vcpu);
6530                 return 1;
6531         }
6532         /*
6533          * Now copy part of this value to register or memory, as requested.
6534          * Note that the number of bits actually copied is 32 or 64 depending
6535          * on the guest's mode (32 or 64 bit), not on the given field's length.
6536          */
6537         if (vmx_instruction_info & (1u << 10)) {
6538                 kvm_register_writel(vcpu, (((vmx_instruction_info) >> 3) & 0xf),
6539                         field_value);
6540         } else {
6541                 if (get_vmx_mem_address(vcpu, exit_qualification,
6542                                 vmx_instruction_info, &gva))
6543                         return 1;
6544                 /* _system ok, as nested_vmx_check_permission verified cpl=0 */
6545                 kvm_write_guest_virt_system(&vcpu->arch.emulate_ctxt, gva,
6546                              &field_value, (is_long_mode(vcpu) ? 8 : 4), NULL);
6547         }
6548
6549         nested_vmx_succeed(vcpu);
6550         skip_emulated_instruction(vcpu);
6551         return 1;
6552 }
6553
6554
6555 static int handle_vmwrite(struct kvm_vcpu *vcpu)
6556 {
6557         unsigned long field;
6558         gva_t gva;
6559         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
6560         u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
6561         /* The value to write might be 32 or 64 bits, depending on L1's long
6562          * mode, and eventually we need to write that into a field of several
6563          * possible lengths. The code below first zero-extends the value to 64
6564          * bit (field_value), and then copies only the approriate number of
6565          * bits into the vmcs12 field.
6566          */
6567         u64 field_value = 0;
6568         struct x86_exception e;
6569
6570         if (!nested_vmx_check_permission(vcpu) ||
6571             !nested_vmx_check_vmcs12(vcpu))
6572                 return 1;
6573
6574         if (vmx_instruction_info & (1u << 10))
6575                 field_value = kvm_register_readl(vcpu,
6576                         (((vmx_instruction_info) >> 3) & 0xf));
6577         else {
6578                 if (get_vmx_mem_address(vcpu, exit_qualification,
6579                                 vmx_instruction_info, &gva))
6580                         return 1;
6581                 if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva,
6582                            &field_value, (is_64_bit_mode(vcpu) ? 8 : 4), &e)) {
6583                         kvm_inject_page_fault(vcpu, &e);
6584                         return 1;
6585                 }
6586         }
6587
6588
6589         field = kvm_register_readl(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
6590         if (vmcs_field_readonly(field)) {
6591                 nested_vmx_failValid(vcpu,
6592                         VMXERR_VMWRITE_READ_ONLY_VMCS_COMPONENT);
6593                 skip_emulated_instruction(vcpu);
6594                 return 1;
6595         }
6596
6597         if (!vmcs12_write_any(vcpu, field, field_value)) {
6598                 nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
6599                 skip_emulated_instruction(vcpu);
6600                 return 1;
6601         }
6602
6603         nested_vmx_succeed(vcpu);
6604         skip_emulated_instruction(vcpu);
6605         return 1;
6606 }
6607
6608 /* Emulate the VMPTRLD instruction */
6609 static int handle_vmptrld(struct kvm_vcpu *vcpu)
6610 {
6611         struct vcpu_vmx *vmx = to_vmx(vcpu);
6612         gpa_t vmptr;
6613         u32 exec_control;
6614
6615         if (!nested_vmx_check_permission(vcpu))
6616                 return 1;
6617
6618         if (nested_vmx_check_vmptr(vcpu, EXIT_REASON_VMPTRLD, &vmptr))
6619                 return 1;
6620
6621         if (vmx->nested.current_vmptr != vmptr) {
6622                 struct vmcs12 *new_vmcs12;
6623                 struct page *page;
6624                 page = nested_get_page(vcpu, vmptr);
6625                 if (page == NULL) {
6626                         nested_vmx_failInvalid(vcpu);
6627                         skip_emulated_instruction(vcpu);
6628                         return 1;
6629                 }
6630                 new_vmcs12 = kmap(page);
6631                 if (new_vmcs12->revision_id != VMCS12_REVISION) {
6632                         kunmap(page);
6633                         nested_release_page_clean(page);
6634                         nested_vmx_failValid(vcpu,
6635                                 VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
6636                         skip_emulated_instruction(vcpu);
6637                         return 1;
6638                 }
6639
6640                 nested_release_vmcs12(vmx);
6641                 vmx->nested.current_vmptr = vmptr;
6642                 vmx->nested.current_vmcs12 = new_vmcs12;
6643                 vmx->nested.current_vmcs12_page = page;
6644                 if (enable_shadow_vmcs) {
6645                         exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
6646                         exec_control |= SECONDARY_EXEC_SHADOW_VMCS;
6647                         vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
6648                         vmcs_write64(VMCS_LINK_POINTER,
6649                                      __pa(vmx->nested.current_shadow_vmcs));
6650                         vmx->nested.sync_shadow_vmcs = true;
6651                 }
6652         }
6653
6654         nested_vmx_succeed(vcpu);
6655         skip_emulated_instruction(vcpu);
6656         return 1;
6657 }
6658
6659 /* Emulate the VMPTRST instruction */
6660 static int handle_vmptrst(struct kvm_vcpu *vcpu)
6661 {
6662         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
6663         u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
6664         gva_t vmcs_gva;
6665         struct x86_exception e;
6666
6667         if (!nested_vmx_check_permission(vcpu))
6668                 return 1;
6669
6670         if (get_vmx_mem_address(vcpu, exit_qualification,
6671                         vmx_instruction_info, &vmcs_gva))
6672                 return 1;
6673         /* ok to use *_system, as nested_vmx_check_permission verified cpl=0 */
6674         if (kvm_write_guest_virt_system(&vcpu->arch.emulate_ctxt, vmcs_gva,
6675                                  (void *)&to_vmx(vcpu)->nested.current_vmptr,
6676                                  sizeof(u64), &e)) {
6677                 kvm_inject_page_fault(vcpu, &e);
6678                 return 1;
6679         }
6680         nested_vmx_succeed(vcpu);
6681         skip_emulated_instruction(vcpu);
6682         return 1;
6683 }
6684
6685 /* Emulate the INVEPT instruction */
6686 static int handle_invept(struct kvm_vcpu *vcpu)
6687 {
6688         u32 vmx_instruction_info, types;
6689         unsigned long type;
6690         gva_t gva;
6691         struct x86_exception e;
6692         struct {
6693                 u64 eptp, gpa;
6694         } operand;
6695
6696         if (!(nested_vmx_secondary_ctls_high & SECONDARY_EXEC_ENABLE_EPT) ||
6697             !(nested_vmx_ept_caps & VMX_EPT_INVEPT_BIT)) {
6698                 kvm_queue_exception(vcpu, UD_VECTOR);
6699                 return 1;
6700         }
6701
6702         if (!nested_vmx_check_permission(vcpu))
6703                 return 1;
6704
6705         if (!kvm_read_cr0_bits(vcpu, X86_CR0_PE)) {
6706                 kvm_queue_exception(vcpu, UD_VECTOR);
6707                 return 1;
6708         }
6709
6710         vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
6711         type = kvm_register_readl(vcpu, (vmx_instruction_info >> 28) & 0xf);
6712
6713         types = (nested_vmx_ept_caps >> VMX_EPT_EXTENT_SHIFT) & 6;
6714
6715         if (!(types & (1UL << type))) {
6716                 nested_vmx_failValid(vcpu,
6717                                 VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
6718                 return 1;
6719         }
6720
6721         /* According to the Intel VMX instruction reference, the memory
6722          * operand is read even if it isn't needed (e.g., for type==global)
6723          */
6724         if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),
6725                         vmx_instruction_info, &gva))
6726                 return 1;
6727         if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &operand,
6728                                 sizeof(operand), &e)) {
6729                 kvm_inject_page_fault(vcpu, &e);
6730                 return 1;
6731         }
6732
6733         switch (type) {
6734         case VMX_EPT_EXTENT_GLOBAL:
6735                 kvm_mmu_sync_roots(vcpu);
6736                 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
6737                 nested_vmx_succeed(vcpu);
6738                 break;
6739         default:
6740                 /* Trap single context invalidation invept calls */
6741                 BUG_ON(1);
6742                 break;
6743         }
6744
6745         skip_emulated_instruction(vcpu);
6746         return 1;
6747 }
6748
6749 /*
6750  * The exit handlers return 1 if the exit was handled fully and guest execution
6751  * may resume.  Otherwise they set the kvm_run parameter to indicate what needs
6752  * to be done to userspace and return 0.
6753  */
6754 static int (*const kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
6755         [EXIT_REASON_EXCEPTION_NMI]           = handle_exception,
6756         [EXIT_REASON_EXTERNAL_INTERRUPT]      = handle_external_interrupt,
6757         [EXIT_REASON_TRIPLE_FAULT]            = handle_triple_fault,
6758         [EXIT_REASON_NMI_WINDOW]              = handle_nmi_window,
6759         [EXIT_REASON_IO_INSTRUCTION]          = handle_io,
6760         [EXIT_REASON_CR_ACCESS]               = handle_cr,
6761         [EXIT_REASON_DR_ACCESS]               = handle_dr,
6762         [EXIT_REASON_CPUID]                   = handle_cpuid,
6763         [EXIT_REASON_MSR_READ]                = handle_rdmsr,
6764         [EXIT_REASON_MSR_WRITE]               = handle_wrmsr,
6765         [EXIT_REASON_PENDING_INTERRUPT]       = handle_interrupt_window,
6766         [EXIT_REASON_HLT]                     = handle_halt,
6767         [EXIT_REASON_INVD]                    = handle_invd,
6768         [EXIT_REASON_INVLPG]                  = handle_invlpg,
6769         [EXIT_REASON_RDPMC]                   = handle_rdpmc,
6770         [EXIT_REASON_VMCALL]                  = handle_vmcall,
6771         [EXIT_REASON_VMCLEAR]                 = handle_vmclear,
6772         [EXIT_REASON_VMLAUNCH]                = handle_vmlaunch,
6773         [EXIT_REASON_VMPTRLD]                 = handle_vmptrld,
6774         [EXIT_REASON_VMPTRST]                 = handle_vmptrst,
6775         [EXIT_REASON_VMREAD]                  = handle_vmread,
6776         [EXIT_REASON_VMRESUME]                = handle_vmresume,
6777         [EXIT_REASON_VMWRITE]                 = handle_vmwrite,
6778         [EXIT_REASON_VMOFF]                   = handle_vmoff,
6779         [EXIT_REASON_VMON]                    = handle_vmon,
6780         [EXIT_REASON_TPR_BELOW_THRESHOLD]     = handle_tpr_below_threshold,
6781         [EXIT_REASON_APIC_ACCESS]             = handle_apic_access,
6782         [EXIT_REASON_APIC_WRITE]              = handle_apic_write,
6783         [EXIT_REASON_EOI_INDUCED]             = handle_apic_eoi_induced,
6784         [EXIT_REASON_WBINVD]                  = handle_wbinvd,
6785         [EXIT_REASON_XSETBV]                  = handle_xsetbv,
6786         [EXIT_REASON_TASK_SWITCH]             = handle_task_switch,
6787         [EXIT_REASON_MCE_DURING_VMENTRY]      = handle_machine_check,
6788         [EXIT_REASON_EPT_VIOLATION]           = handle_ept_violation,
6789         [EXIT_REASON_EPT_MISCONFIG]           = handle_ept_misconfig,
6790         [EXIT_REASON_PAUSE_INSTRUCTION]       = handle_pause,
6791         [EXIT_REASON_MWAIT_INSTRUCTION]       = handle_mwait,
6792         [EXIT_REASON_MONITOR_INSTRUCTION]     = handle_monitor,
6793         [EXIT_REASON_INVEPT]                  = handle_invept,
6794 };
6795
6796 static const int kvm_vmx_max_exit_handlers =
6797         ARRAY_SIZE(kvm_vmx_exit_handlers);
6798
6799 static bool nested_vmx_exit_handled_io(struct kvm_vcpu *vcpu,
6800                                        struct vmcs12 *vmcs12)
6801 {
6802         unsigned long exit_qualification;
6803         gpa_t bitmap, last_bitmap;
6804         unsigned int port;
6805         int size;
6806         u8 b;
6807
6808         if (!nested_cpu_has(vmcs12, CPU_BASED_USE_IO_BITMAPS))
6809                 return nested_cpu_has(vmcs12, CPU_BASED_UNCOND_IO_EXITING);
6810
6811         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
6812
6813         port = exit_qualification >> 16;
6814         size = (exit_qualification & 7) + 1;
6815
6816         last_bitmap = (gpa_t)-1;
6817         b = -1;
6818
6819         while (size > 0) {
6820                 if (port < 0x8000)
6821                         bitmap = vmcs12->io_bitmap_a;
6822                 else if (port < 0x10000)
6823                         bitmap = vmcs12->io_bitmap_b;
6824                 else
6825                         return 1;
6826                 bitmap += (port & 0x7fff) / 8;
6827
6828                 if (last_bitmap != bitmap)
6829                         if (kvm_read_guest(vcpu->kvm, bitmap, &b, 1))
6830                                 return 1;
6831                 if (b & (1 << (port & 7)))
6832                         return 1;
6833
6834                 port++;
6835                 size--;
6836                 last_bitmap = bitmap;
6837         }
6838
6839         return 0;
6840 }
6841
6842 /*
6843  * Return 1 if we should exit from L2 to L1 to handle an MSR access access,
6844  * rather than handle it ourselves in L0. I.e., check whether L1 expressed
6845  * disinterest in the current event (read or write a specific MSR) by using an
6846  * MSR bitmap. This may be the case even when L0 doesn't use MSR bitmaps.
6847  */
6848 static bool nested_vmx_exit_handled_msr(struct kvm_vcpu *vcpu,
6849         struct vmcs12 *vmcs12, u32 exit_reason)
6850 {
6851         u32 msr_index = vcpu->arch.regs[VCPU_REGS_RCX];
6852         gpa_t bitmap;
6853
6854         if (!nested_cpu_has(vmcs12, CPU_BASED_USE_MSR_BITMAPS))
6855                 return 1;
6856
6857         /*
6858          * The MSR_BITMAP page is divided into four 1024-byte bitmaps,
6859          * for the four combinations of read/write and low/high MSR numbers.
6860          * First we need to figure out which of the four to use:
6861          */
6862         bitmap = vmcs12->msr_bitmap;
6863         if (exit_reason == EXIT_REASON_MSR_WRITE)
6864                 bitmap += 2048;
6865         if (msr_index >= 0xc0000000) {
6866                 msr_index -= 0xc0000000;
6867                 bitmap += 1024;
6868         }
6869
6870         /* Then read the msr_index'th bit from this bitmap: */
6871         if (msr_index < 1024*8) {
6872                 unsigned char b;
6873                 if (kvm_read_guest(vcpu->kvm, bitmap + msr_index/8, &b, 1))
6874                         return 1;
6875                 return 1 & (b >> (msr_index & 7));
6876         } else
6877                 return 1; /* let L1 handle the wrong parameter */
6878 }
6879
6880 /*
6881  * Return 1 if we should exit from L2 to L1 to handle a CR access exit,
6882  * rather than handle it ourselves in L0. I.e., check if L1 wanted to
6883  * intercept (via guest_host_mask etc.) the current event.
6884  */
6885 static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu,
6886         struct vmcs12 *vmcs12)
6887 {
6888         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
6889         int cr = exit_qualification & 15;
6890         int reg = (exit_qualification >> 8) & 15;
6891         unsigned long val = kvm_register_readl(vcpu, reg);
6892
6893         switch ((exit_qualification >> 4) & 3) {
6894         case 0: /* mov to cr */
6895                 switch (cr) {
6896                 case 0:
6897                         if (vmcs12->cr0_guest_host_mask &
6898                             (val ^ vmcs12->cr0_read_shadow))
6899                                 return 1;
6900                         break;
6901                 case 3:
6902                         if ((vmcs12->cr3_target_count >= 1 &&
6903                                         vmcs12->cr3_target_value0 == val) ||
6904                                 (vmcs12->cr3_target_count >= 2 &&
6905                                         vmcs12->cr3_target_value1 == val) ||
6906                                 (vmcs12->cr3_target_count >= 3 &&
6907                                         vmcs12->cr3_target_value2 == val) ||
6908                                 (vmcs12->cr3_target_count >= 4 &&
6909                                         vmcs12->cr3_target_value3 == val))
6910                                 return 0;
6911                         if (nested_cpu_has(vmcs12, CPU_BASED_CR3_LOAD_EXITING))
6912                                 return 1;
6913                         break;
6914                 case 4:
6915                         if (vmcs12->cr4_guest_host_mask &
6916                             (vmcs12->cr4_read_shadow ^ val))
6917                                 return 1;
6918                         break;
6919                 case 8:
6920                         if (nested_cpu_has(vmcs12, CPU_BASED_CR8_LOAD_EXITING))
6921                                 return 1;
6922                         break;
6923                 }
6924                 break;
6925         case 2: /* clts */
6926                 if ((vmcs12->cr0_guest_host_mask & X86_CR0_TS) &&
6927                     (vmcs12->cr0_read_shadow & X86_CR0_TS))
6928                         return 1;
6929                 break;
6930         case 1: /* mov from cr */
6931                 switch (cr) {
6932                 case 3:
6933                         if (vmcs12->cpu_based_vm_exec_control &
6934                             CPU_BASED_CR3_STORE_EXITING)
6935                                 return 1;
6936                         break;
6937                 case 8:
6938                         if (vmcs12->cpu_based_vm_exec_control &
6939                             CPU_BASED_CR8_STORE_EXITING)
6940                                 return 1;
6941                         break;
6942                 }
6943                 break;
6944         case 3: /* lmsw */
6945                 /*
6946                  * lmsw can change bits 1..3 of cr0, and only set bit 0 of
6947                  * cr0. Other attempted changes are ignored, with no exit.
6948                  */
6949                 if (vmcs12->cr0_guest_host_mask & 0xe &
6950                     (val ^ vmcs12->cr0_read_shadow))
6951                         return 1;
6952                 if ((vmcs12->cr0_guest_host_mask & 0x1) &&
6953                     !(vmcs12->cr0_read_shadow & 0x1) &&
6954                     (val & 0x1))
6955                         return 1;
6956                 break;
6957         }
6958         return 0;
6959 }
6960
6961 /*
6962  * Return 1 if we should exit from L2 to L1 to handle an exit, or 0 if we
6963  * should handle it ourselves in L0 (and then continue L2). Only call this
6964  * when in is_guest_mode (L2).
6965  */
6966 static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu)
6967 {
6968         u32 intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
6969         struct vcpu_vmx *vmx = to_vmx(vcpu);
6970         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
6971         u32 exit_reason = vmx->exit_reason;
6972
6973         trace_kvm_nested_vmexit(kvm_rip_read(vcpu), exit_reason,
6974                                 vmcs_readl(EXIT_QUALIFICATION),
6975                                 vmx->idt_vectoring_info,
6976                                 intr_info,
6977                                 vmcs_read32(VM_EXIT_INTR_ERROR_CODE),
6978                                 KVM_ISA_VMX);
6979
6980         if (vmx->nested.nested_run_pending)
6981                 return 0;
6982
6983         if (unlikely(vmx->fail)) {
6984                 pr_info_ratelimited("%s failed vm entry %x\n", __func__,
6985                                     vmcs_read32(VM_INSTRUCTION_ERROR));
6986                 return 1;
6987         }
6988
6989         switch (exit_reason) {
6990         case EXIT_REASON_EXCEPTION_NMI:
6991                 if (!is_exception(intr_info))
6992                         return 0;
6993                 else if (is_page_fault(intr_info))
6994                         return enable_ept;
6995                 else if (is_no_device(intr_info) &&
6996                          !(vmcs12->guest_cr0 & X86_CR0_TS))
6997                         return 0;
6998                 return vmcs12->exception_bitmap &
6999                                 (1u << (intr_info & INTR_INFO_VECTOR_MASK));
7000         case EXIT_REASON_EXTERNAL_INTERRUPT:
7001                 return 0;
7002         case EXIT_REASON_TRIPLE_FAULT:
7003                 return 1;
7004         case EXIT_REASON_PENDING_INTERRUPT:
7005                 return nested_cpu_has(vmcs12, CPU_BASED_VIRTUAL_INTR_PENDING);
7006         case EXIT_REASON_NMI_WINDOW:
7007                 return nested_cpu_has(vmcs12, CPU_BASED_VIRTUAL_NMI_PENDING);
7008         case EXIT_REASON_TASK_SWITCH:
7009                 return 1;
7010         case EXIT_REASON_CPUID:
7011                 if (kvm_register_read(vcpu, VCPU_REGS_RAX) == 0xa)
7012                         return 0;
7013                 return 1;
7014         case EXIT_REASON_HLT:
7015                 return nested_cpu_has(vmcs12, CPU_BASED_HLT_EXITING);
7016         case EXIT_REASON_INVD:
7017                 return 1;
7018         case EXIT_REASON_INVLPG:
7019                 return nested_cpu_has(vmcs12, CPU_BASED_INVLPG_EXITING);
7020         case EXIT_REASON_RDPMC:
7021                 return nested_cpu_has(vmcs12, CPU_BASED_RDPMC_EXITING);
7022         case EXIT_REASON_RDTSC:
7023                 return nested_cpu_has(vmcs12, CPU_BASED_RDTSC_EXITING);
7024         case EXIT_REASON_VMCALL: case EXIT_REASON_VMCLEAR:
7025         case EXIT_REASON_VMLAUNCH: case EXIT_REASON_VMPTRLD:
7026         case EXIT_REASON_VMPTRST: case EXIT_REASON_VMREAD:
7027         case EXIT_REASON_VMRESUME: case EXIT_REASON_VMWRITE:
7028         case EXIT_REASON_VMOFF: case EXIT_REASON_VMON:
7029         case EXIT_REASON_INVEPT:
7030                 /*
7031                  * VMX instructions trap unconditionally. This allows L1 to
7032                  * emulate them for its L2 guest, i.e., allows 3-level nesting!
7033                  */
7034                 return 1;
7035         case EXIT_REASON_CR_ACCESS:
7036                 return nested_vmx_exit_handled_cr(vcpu, vmcs12);
7037         case EXIT_REASON_DR_ACCESS:
7038                 return nested_cpu_has(vmcs12, CPU_BASED_MOV_DR_EXITING);
7039         case EXIT_REASON_IO_INSTRUCTION:
7040                 return nested_vmx_exit_handled_io(vcpu, vmcs12);
7041         case EXIT_REASON_MSR_READ:
7042         case EXIT_REASON_MSR_WRITE:
7043                 return nested_vmx_exit_handled_msr(vcpu, vmcs12, exit_reason);
7044         case EXIT_REASON_INVALID_STATE:
7045                 return 1;
7046         case EXIT_REASON_MWAIT_INSTRUCTION:
7047                 return nested_cpu_has(vmcs12, CPU_BASED_MWAIT_EXITING);
7048         case EXIT_REASON_MONITOR_INSTRUCTION:
7049                 return nested_cpu_has(vmcs12, CPU_BASED_MONITOR_EXITING);
7050         case EXIT_REASON_PAUSE_INSTRUCTION:
7051                 return nested_cpu_has(vmcs12, CPU_BASED_PAUSE_EXITING) ||
7052                         nested_cpu_has2(vmcs12,
7053                                 SECONDARY_EXEC_PAUSE_LOOP_EXITING);
7054         case EXIT_REASON_MCE_DURING_VMENTRY:
7055                 return 0;
7056         case EXIT_REASON_TPR_BELOW_THRESHOLD:
7057                 return nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW);
7058         case EXIT_REASON_APIC_ACCESS:
7059                 return nested_cpu_has2(vmcs12,
7060                         SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES);
7061         case EXIT_REASON_EPT_VIOLATION:
7062                 /*
7063                  * L0 always deals with the EPT violation. If nested EPT is
7064                  * used, and the nested mmu code discovers that the address is
7065                  * missing in the guest EPT table (EPT12), the EPT violation
7066                  * will be injected with nested_ept_inject_page_fault()
7067                  */
7068                 return 0;
7069         case EXIT_REASON_EPT_MISCONFIG:
7070                 /*
7071                  * L2 never uses directly L1's EPT, but rather L0's own EPT
7072                  * table (shadow on EPT) or a merged EPT table that L0 built
7073                  * (EPT on EPT). So any problems with the structure of the
7074                  * table is L0's fault.
7075                  */
7076                 return 0;
7077         case EXIT_REASON_WBINVD:
7078                 return nested_cpu_has2(vmcs12, SECONDARY_EXEC_WBINVD_EXITING);
7079         case EXIT_REASON_XSETBV:
7080                 return 1;
7081         default:
7082                 return 1;
7083         }
7084 }
7085
7086 static void vmx_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2)
7087 {
7088         *info1 = vmcs_readl(EXIT_QUALIFICATION);
7089         *info2 = vmcs_read32(VM_EXIT_INTR_INFO);
7090 }
7091
7092 /*
7093  * The guest has exited.  See if we can fix it or if we need userspace
7094  * assistance.
7095  */
7096 static int vmx_handle_exit(struct kvm_vcpu *vcpu)
7097 {
7098         struct vcpu_vmx *vmx = to_vmx(vcpu);
7099         u32 exit_reason = vmx->exit_reason;
7100         u32 vectoring_info = vmx->idt_vectoring_info;
7101
7102         /* If guest state is invalid, start emulating */
7103         if (vmx->emulation_required)
7104                 return handle_invalid_guest_state(vcpu);
7105
7106         if (is_guest_mode(vcpu) && nested_vmx_exit_handled(vcpu)) {
7107                 nested_vmx_vmexit(vcpu, exit_reason,
7108                                   vmcs_read32(VM_EXIT_INTR_INFO),
7109                                   vmcs_readl(EXIT_QUALIFICATION));
7110                 return 1;
7111         }
7112
7113         if (exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) {
7114                 vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY;
7115                 vcpu->run->fail_entry.hardware_entry_failure_reason
7116                         = exit_reason;
7117                 return 0;
7118         }
7119
7120         if (unlikely(vmx->fail)) {
7121                 vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY;
7122                 vcpu->run->fail_entry.hardware_entry_failure_reason
7123                         = vmcs_read32(VM_INSTRUCTION_ERROR);
7124                 return 0;
7125         }
7126
7127         /*
7128          * Note:
7129          * Do not try to fix EXIT_REASON_EPT_MISCONFIG if it caused by
7130          * delivery event since it indicates guest is accessing MMIO.
7131          * The vm-exit can be triggered again after return to guest that
7132          * will cause infinite loop.
7133          */
7134         if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
7135                         (exit_reason != EXIT_REASON_EXCEPTION_NMI &&
7136                         exit_reason != EXIT_REASON_EPT_VIOLATION &&
7137                         exit_reason != EXIT_REASON_TASK_SWITCH)) {
7138                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
7139                 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_DELIVERY_EV;
7140                 vcpu->run->internal.ndata = 2;
7141                 vcpu->run->internal.data[0] = vectoring_info;
7142                 vcpu->run->internal.data[1] = exit_reason;
7143                 return 0;
7144         }
7145
7146         if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked &&
7147             !(is_guest_mode(vcpu) && nested_cpu_has_virtual_nmis(
7148                                         get_vmcs12(vcpu))))) {
7149                 if (vmx_interrupt_allowed(vcpu)) {
7150                         vmx->soft_vnmi_blocked = 0;
7151                 } else if (vmx->vnmi_blocked_time > 1000000000LL &&
7152                            vcpu->arch.nmi_pending) {
7153                         /*
7154                          * This CPU don't support us in finding the end of an
7155                          * NMI-blocked window if the guest runs with IRQs
7156                          * disabled. So we pull the trigger after 1 s of
7157                          * futile waiting, but inform the user about this.
7158                          */
7159                         printk(KERN_WARNING "%s: Breaking out of NMI-blocked "
7160                                "state on VCPU %d after 1 s timeout\n",
7161                                __func__, vcpu->vcpu_id);
7162                         vmx->soft_vnmi_blocked = 0;
7163                 }
7164         }
7165
7166         if (exit_reason < kvm_vmx_max_exit_handlers
7167             && kvm_vmx_exit_handlers[exit_reason])
7168                 return kvm_vmx_exit_handlers[exit_reason](vcpu);
7169         else {
7170                 vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
7171                 vcpu->run->hw.hardware_exit_reason = exit_reason;
7172         }
7173         return 0;
7174 }
7175
7176 static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
7177 {
7178         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
7179
7180         if (is_guest_mode(vcpu) &&
7181                 nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW))
7182                 return;
7183
7184         if (irr == -1 || tpr < irr) {
7185                 vmcs_write32(TPR_THRESHOLD, 0);
7186                 return;
7187         }
7188
7189         vmcs_write32(TPR_THRESHOLD, irr);
7190 }
7191
7192 static void vmx_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set)
7193 {
7194         u32 sec_exec_control;
7195
7196         /*
7197          * There is not point to enable virtualize x2apic without enable
7198          * apicv
7199          */
7200         if (!cpu_has_vmx_virtualize_x2apic_mode() ||
7201                                 !vmx_vm_has_apicv(vcpu->kvm))
7202                 return;
7203
7204         if (!vm_need_tpr_shadow(vcpu->kvm))
7205                 return;
7206
7207         sec_exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
7208
7209         if (set) {
7210                 sec_exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
7211                 sec_exec_control |= SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE;
7212         } else {
7213                 sec_exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE;
7214                 sec_exec_control |= SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
7215         }
7216         vmcs_write32(SECONDARY_VM_EXEC_CONTROL, sec_exec_control);
7217
7218         vmx_set_msr_bitmap(vcpu);
7219 }
7220
7221 static void vmx_set_apic_access_page_addr(struct kvm_vcpu *vcpu, hpa_t hpa)
7222 {
7223         struct vcpu_vmx *vmx = to_vmx(vcpu);
7224
7225         /*
7226          * Currently we do not handle the nested case where L2 has an
7227          * APIC access page of its own; that page is still pinned.
7228          * Hence, we skip the case where the VCPU is in guest mode _and_
7229          * L1 prepared an APIC access page for L2.
7230          *
7231          * For the case where L1 and L2 share the same APIC access page
7232          * (flexpriority=Y but SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES clear
7233          * in the vmcs12), this function will only update either the vmcs01
7234          * or the vmcs02.  If the former, the vmcs02 will be updated by
7235          * prepare_vmcs02.  If the latter, the vmcs01 will be updated in
7236          * the next L2->L1 exit.
7237          */
7238         if (!is_guest_mode(vcpu) ||
7239             !nested_cpu_has2(vmx->nested.current_vmcs12,
7240                              SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
7241                 vmcs_write64(APIC_ACCESS_ADDR, hpa);
7242 }
7243
7244 static void vmx_hwapic_isr_update(struct kvm *kvm, int isr)
7245 {
7246         u16 status;
7247         u8 old;
7248
7249         if (!vmx_vm_has_apicv(kvm))
7250                 return;
7251
7252         if (isr == -1)
7253                 isr = 0;
7254
7255         status = vmcs_read16(GUEST_INTR_STATUS);
7256         old = status >> 8;
7257         if (isr != old) {
7258                 status &= 0xff;
7259                 status |= isr << 8;
7260                 vmcs_write16(GUEST_INTR_STATUS, status);
7261         }
7262 }
7263
7264 static void vmx_set_rvi(int vector)
7265 {
7266         u16 status;
7267         u8 old;
7268
7269         status = vmcs_read16(GUEST_INTR_STATUS);
7270         old = (u8)status & 0xff;
7271         if ((u8)vector != old) {
7272                 status &= ~0xff;
7273                 status |= (u8)vector;
7274                 vmcs_write16(GUEST_INTR_STATUS, status);
7275         }
7276 }
7277
7278 static void vmx_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr)
7279 {
7280         if (max_irr == -1)
7281                 return;
7282
7283         /*
7284          * If a vmexit is needed, vmx_check_nested_events handles it.
7285          */
7286         if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu))
7287                 return;
7288
7289         if (!is_guest_mode(vcpu)) {
7290                 vmx_set_rvi(max_irr);
7291                 return;
7292         }
7293
7294         /*
7295          * Fall back to pre-APICv interrupt injection since L2
7296          * is run without virtual interrupt delivery.
7297          */
7298         if (!kvm_event_needs_reinjection(vcpu) &&
7299             vmx_interrupt_allowed(vcpu)) {
7300                 kvm_queue_interrupt(vcpu, max_irr, false);
7301                 vmx_inject_irq(vcpu);
7302         }
7303 }
7304
7305 static void vmx_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
7306 {
7307         if (!vmx_vm_has_apicv(vcpu->kvm))
7308                 return;
7309
7310         vmcs_write64(EOI_EXIT_BITMAP0, eoi_exit_bitmap[0]);
7311         vmcs_write64(EOI_EXIT_BITMAP1, eoi_exit_bitmap[1]);
7312         vmcs_write64(EOI_EXIT_BITMAP2, eoi_exit_bitmap[2]);
7313         vmcs_write64(EOI_EXIT_BITMAP3, eoi_exit_bitmap[3]);
7314 }
7315
7316 static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx)
7317 {
7318         u32 exit_intr_info;
7319
7320         if (!(vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY
7321               || vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI))
7322                 return;
7323
7324         vmx->exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
7325         exit_intr_info = vmx->exit_intr_info;
7326
7327         /* Handle machine checks before interrupts are enabled */
7328         if (is_machine_check(exit_intr_info))
7329                 kvm_machine_check();
7330
7331         /* We need to handle NMIs before interrupts are enabled */
7332         if ((exit_intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR &&
7333             (exit_intr_info & INTR_INFO_VALID_MASK)) {
7334                 kvm_before_handle_nmi(&vmx->vcpu);
7335                 asm("int $2");
7336                 kvm_after_handle_nmi(&vmx->vcpu);
7337         }
7338 }
7339
7340 static void vmx_handle_external_intr(struct kvm_vcpu *vcpu)
7341 {
7342         u32 exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
7343
7344         /*
7345          * If external interrupt exists, IF bit is set in rflags/eflags on the
7346          * interrupt stack frame, and interrupt will be enabled on a return
7347          * from interrupt handler.
7348          */
7349         if ((exit_intr_info & (INTR_INFO_VALID_MASK | INTR_INFO_INTR_TYPE_MASK))
7350                         == (INTR_INFO_VALID_MASK | INTR_TYPE_EXT_INTR)) {
7351                 unsigned int vector;
7352                 unsigned long entry;
7353                 gate_desc *desc;
7354                 struct vcpu_vmx *vmx = to_vmx(vcpu);
7355 #ifdef CONFIG_X86_64
7356                 unsigned long tmp;
7357 #endif
7358
7359                 vector =  exit_intr_info & INTR_INFO_VECTOR_MASK;
7360                 desc = (gate_desc *)vmx->host_idt_base + vector;
7361                 entry = gate_offset(*desc);
7362                 asm volatile(
7363 #ifdef CONFIG_X86_64
7364                         "mov %%" _ASM_SP ", %[sp]\n\t"
7365                         "and $0xfffffffffffffff0, %%" _ASM_SP "\n\t"
7366                         "push $%c[ss]\n\t"
7367                         "push %[sp]\n\t"
7368 #endif
7369                         "pushf\n\t"
7370                         "orl $0x200, (%%" _ASM_SP ")\n\t"
7371                         __ASM_SIZE(push) " $%c[cs]\n\t"
7372                         "call *%[entry]\n\t"
7373                         :
7374 #ifdef CONFIG_X86_64
7375                         [sp]"=&r"(tmp)
7376 #endif
7377                         :
7378                         [entry]"r"(entry),
7379                         [ss]"i"(__KERNEL_DS),
7380                         [cs]"i"(__KERNEL_CS)
7381                         );
7382         } else
7383                 local_irq_enable();
7384 }
7385
7386 static bool vmx_mpx_supported(void)
7387 {
7388         return (vmcs_config.vmexit_ctrl & VM_EXIT_CLEAR_BNDCFGS) &&
7389                 (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_BNDCFGS);
7390 }
7391
7392 static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx)
7393 {
7394         u32 exit_intr_info;
7395         bool unblock_nmi;
7396         u8 vector;
7397         bool idtv_info_valid;
7398
7399         idtv_info_valid = vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK;
7400
7401         if (cpu_has_virtual_nmis()) {
7402                 if (vmx->nmi_known_unmasked)
7403                         return;
7404                 /*
7405                  * Can't use vmx->exit_intr_info since we're not sure what
7406                  * the exit reason is.
7407                  */
7408                 exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
7409                 unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
7410                 vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
7411                 /*
7412                  * SDM 3: 27.7.1.2 (September 2008)
7413                  * Re-set bit "block by NMI" before VM entry if vmexit caused by
7414                  * a guest IRET fault.
7415                  * SDM 3: 23.2.2 (September 2008)
7416                  * Bit 12 is undefined in any of the following cases:
7417                  *  If the VM exit sets the valid bit in the IDT-vectoring
7418                  *   information field.
7419                  *  If the VM exit is due to a double fault.
7420                  */
7421                 if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi &&
7422                     vector != DF_VECTOR && !idtv_info_valid)
7423                         vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
7424                                       GUEST_INTR_STATE_NMI);
7425                 else
7426                         vmx->nmi_known_unmasked =
7427                                 !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO)
7428                                   & GUEST_INTR_STATE_NMI);
7429         } else if (unlikely(vmx->soft_vnmi_blocked))
7430                 vmx->vnmi_blocked_time +=
7431                         ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time));
7432 }
7433
7434 static void __vmx_complete_interrupts(struct kvm_vcpu *vcpu,
7435                                       u32 idt_vectoring_info,
7436                                       int instr_len_field,
7437                                       int error_code_field)
7438 {
7439         u8 vector;
7440         int type;
7441         bool idtv_info_valid;
7442
7443         idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;
7444
7445         vcpu->arch.nmi_injected = false;
7446         kvm_clear_exception_queue(vcpu);
7447         kvm_clear_interrupt_queue(vcpu);
7448
7449         if (!idtv_info_valid)
7450                 return;
7451
7452         kvm_make_request(KVM_REQ_EVENT, vcpu);
7453
7454         vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
7455         type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;
7456
7457         switch (type) {
7458         case INTR_TYPE_NMI_INTR:
7459                 vcpu->arch.nmi_injected = true;
7460                 /*
7461                  * SDM 3: 27.7.1.2 (September 2008)
7462                  * Clear bit "block by NMI" before VM entry if a NMI
7463                  * delivery faulted.
7464                  */
7465                 vmx_set_nmi_mask(vcpu, false);
7466                 break;
7467         case INTR_TYPE_SOFT_EXCEPTION:
7468                 vcpu->arch.event_exit_inst_len = vmcs_read32(instr_len_field);
7469                 /* fall through */
7470         case INTR_TYPE_HARD_EXCEPTION:
7471                 if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) {
7472                         u32 err = vmcs_read32(error_code_field);
7473                         kvm_requeue_exception_e(vcpu, vector, err);
7474                 } else
7475                         kvm_requeue_exception(vcpu, vector);
7476                 break;
7477         case INTR_TYPE_SOFT_INTR:
7478                 vcpu->arch.event_exit_inst_len = vmcs_read32(instr_len_field);
7479                 /* fall through */
7480         case INTR_TYPE_EXT_INTR:
7481                 kvm_queue_interrupt(vcpu, vector, type == INTR_TYPE_SOFT_INTR);
7482                 break;
7483         default:
7484                 break;
7485         }
7486 }
7487
7488 static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
7489 {
7490         __vmx_complete_interrupts(&vmx->vcpu, vmx->idt_vectoring_info,
7491                                   VM_EXIT_INSTRUCTION_LEN,
7492                                   IDT_VECTORING_ERROR_CODE);
7493 }
7494
7495 static void vmx_cancel_injection(struct kvm_vcpu *vcpu)
7496 {
7497         __vmx_complete_interrupts(vcpu,
7498                                   vmcs_read32(VM_ENTRY_INTR_INFO_FIELD),
7499                                   VM_ENTRY_INSTRUCTION_LEN,
7500                                   VM_ENTRY_EXCEPTION_ERROR_CODE);
7501
7502         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);
7503 }
7504
7505 static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx)
7506 {
7507         int i, nr_msrs;
7508         struct perf_guest_switch_msr *msrs;
7509
7510         msrs = perf_guest_get_msrs(&nr_msrs);
7511
7512         if (!msrs)
7513                 return;
7514
7515         for (i = 0; i < nr_msrs; i++)
7516                 if (msrs[i].host == msrs[i].guest)
7517                         clear_atomic_switch_msr(vmx, msrs[i].msr);
7518                 else
7519                         add_atomic_switch_msr(vmx, msrs[i].msr, msrs[i].guest,
7520                                         msrs[i].host);
7521 }
7522
7523 static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
7524 {
7525         struct vcpu_vmx *vmx = to_vmx(vcpu);
7526         unsigned long debugctlmsr, cr4;
7527
7528         /* Record the guest's net vcpu time for enforced NMI injections. */
7529         if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
7530                 vmx->entry_time = ktime_get();
7531
7532         /* Don't enter VMX if guest state is invalid, let the exit handler
7533            start emulation until we arrive back to a valid state */
7534         if (vmx->emulation_required)
7535                 return;
7536
7537         if (vmx->ple_window_dirty) {
7538                 vmx->ple_window_dirty = false;
7539                 vmcs_write32(PLE_WINDOW, vmx->ple_window);
7540         }
7541
7542         if (vmx->nested.sync_shadow_vmcs) {
7543                 copy_vmcs12_to_shadow(vmx);
7544                 vmx->nested.sync_shadow_vmcs = false;
7545         }
7546
7547         if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
7548                 vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
7549         if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
7550                 vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
7551
7552         cr4 = read_cr4();
7553         if (unlikely(cr4 != vmx->host_state.vmcs_host_cr4)) {
7554                 vmcs_writel(HOST_CR4, cr4);
7555                 vmx->host_state.vmcs_host_cr4 = cr4;
7556         }
7557
7558         /* When single-stepping over STI and MOV SS, we must clear the
7559          * corresponding interruptibility bits in the guest state. Otherwise
7560          * vmentry fails as it then expects bit 14 (BS) in pending debug
7561          * exceptions being set, but that's not correct for the guest debugging
7562          * case. */
7563         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
7564                 vmx_set_interrupt_shadow(vcpu, 0);
7565
7566         atomic_switch_perf_msrs(vmx);
7567         debugctlmsr = get_debugctlmsr();
7568
7569         vmx->__launched = vmx->loaded_vmcs->launched;
7570         asm(
7571                 /* Store host registers */
7572                 "push %%" _ASM_DX "; push %%" _ASM_BP ";"
7573                 "push %%" _ASM_CX " \n\t" /* placeholder for guest rcx */
7574                 "push %%" _ASM_CX " \n\t"
7575                 "cmp %%" _ASM_SP ", %c[host_rsp](%0) \n\t"
7576                 "je 1f \n\t"
7577                 "mov %%" _ASM_SP ", %c[host_rsp](%0) \n\t"
7578                 __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t"
7579                 "1: \n\t"
7580                 /* Reload cr2 if changed */
7581                 "mov %c[cr2](%0), %%" _ASM_AX " \n\t"
7582                 "mov %%cr2, %%" _ASM_DX " \n\t"
7583                 "cmp %%" _ASM_AX ", %%" _ASM_DX " \n\t"
7584                 "je 2f \n\t"
7585                 "mov %%" _ASM_AX", %%cr2 \n\t"
7586                 "2: \n\t"
7587                 /* Check if vmlaunch of vmresume is needed */
7588                 "cmpl $0, %c[launched](%0) \n\t"
7589                 /* Load guest registers.  Don't clobber flags. */
7590                 "mov %c[rax](%0), %%" _ASM_AX " \n\t"
7591                 "mov %c[rbx](%0), %%" _ASM_BX " \n\t"
7592                 "mov %c[rdx](%0), %%" _ASM_DX " \n\t"
7593                 "mov %c[rsi](%0), %%" _ASM_SI " \n\t"
7594                 "mov %c[rdi](%0), %%" _ASM_DI " \n\t"
7595                 "mov %c[rbp](%0), %%" _ASM_BP " \n\t"
7596 #ifdef CONFIG_X86_64
7597                 "mov %c[r8](%0),  %%r8  \n\t"
7598                 "mov %c[r9](%0),  %%r9  \n\t"
7599                 "mov %c[r10](%0), %%r10 \n\t"
7600                 "mov %c[r11](%0), %%r11 \n\t"
7601                 "mov %c[r12](%0), %%r12 \n\t"
7602                 "mov %c[r13](%0), %%r13 \n\t"
7603                 "mov %c[r14](%0), %%r14 \n\t"
7604                 "mov %c[r15](%0), %%r15 \n\t"
7605 #endif
7606                 "mov %c[rcx](%0), %%" _ASM_CX " \n\t" /* kills %0 (ecx) */
7607
7608                 /* Enter guest mode */
7609                 "jne 1f \n\t"
7610                 __ex(ASM_VMX_VMLAUNCH) "\n\t"
7611                 "jmp 2f \n\t"
7612                 "1: " __ex(ASM_VMX_VMRESUME) "\n\t"
7613                 "2: "
7614                 /* Save guest registers, load host registers, keep flags */
7615                 "mov %0, %c[wordsize](%%" _ASM_SP ") \n\t"
7616                 "pop %0 \n\t"
7617                 "mov %%" _ASM_AX ", %c[rax](%0) \n\t"
7618                 "mov %%" _ASM_BX ", %c[rbx](%0) \n\t"
7619                 __ASM_SIZE(pop) " %c[rcx](%0) \n\t"
7620                 "mov %%" _ASM_DX ", %c[rdx](%0) \n\t"
7621                 "mov %%" _ASM_SI ", %c[rsi](%0) \n\t"
7622                 "mov %%" _ASM_DI ", %c[rdi](%0) \n\t"
7623                 "mov %%" _ASM_BP ", %c[rbp](%0) \n\t"
7624 #ifdef CONFIG_X86_64
7625                 "mov %%r8,  %c[r8](%0) \n\t"
7626                 "mov %%r9,  %c[r9](%0) \n\t"
7627                 "mov %%r10, %c[r10](%0) \n\t"
7628                 "mov %%r11, %c[r11](%0) \n\t"
7629                 "mov %%r12, %c[r12](%0) \n\t"
7630                 "mov %%r13, %c[r13](%0) \n\t"
7631                 "mov %%r14, %c[r14](%0) \n\t"
7632                 "mov %%r15, %c[r15](%0) \n\t"
7633 #endif
7634                 "mov %%cr2, %%" _ASM_AX "   \n\t"
7635                 "mov %%" _ASM_AX ", %c[cr2](%0) \n\t"
7636
7637                 "pop  %%" _ASM_BP "; pop  %%" _ASM_DX " \n\t"
7638                 "setbe %c[fail](%0) \n\t"
7639                 ".pushsection .rodata \n\t"
7640                 ".global vmx_return \n\t"
7641                 "vmx_return: " _ASM_PTR " 2b \n\t"
7642                 ".popsection"
7643               : : "c"(vmx), "d"((unsigned long)HOST_RSP),
7644                 [launched]"i"(offsetof(struct vcpu_vmx, __launched)),
7645                 [fail]"i"(offsetof(struct vcpu_vmx, fail)),
7646                 [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)),
7647                 [rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])),
7648                 [rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])),
7649                 [rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])),
7650                 [rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])),
7651                 [rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])),
7652                 [rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])),
7653                 [rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])),
7654 #ifdef CONFIG_X86_64
7655                 [r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])),
7656                 [r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])),
7657                 [r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])),
7658                 [r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])),
7659                 [r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])),
7660                 [r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])),
7661                 [r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])),
7662                 [r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])),
7663 #endif
7664                 [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2)),
7665                 [wordsize]"i"(sizeof(ulong))
7666               : "cc", "memory"
7667 #ifdef CONFIG_X86_64
7668                 , "rax", "rbx", "rdi", "rsi"
7669                 , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
7670 #else
7671                 , "eax", "ebx", "edi", "esi"
7672 #endif
7673               );
7674
7675         /* MSR_IA32_DEBUGCTLMSR is zeroed on vmexit. Restore it if needed */
7676         if (debugctlmsr)
7677                 update_debugctlmsr(debugctlmsr);
7678
7679 #ifndef CONFIG_X86_64
7680         /*
7681          * The sysexit path does not restore ds/es, so we must set them to
7682          * a reasonable value ourselves.
7683          *
7684          * We can't defer this to vmx_load_host_state() since that function
7685          * may be executed in interrupt context, which saves and restore segments
7686          * around it, nullifying its effect.
7687          */
7688         loadsegment(ds, __USER_DS);
7689         loadsegment(es, __USER_DS);
7690 #endif
7691
7692         vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)
7693                                   | (1 << VCPU_EXREG_RFLAGS)
7694                                   | (1 << VCPU_EXREG_PDPTR)
7695                                   | (1 << VCPU_EXREG_SEGMENTS)
7696                                   | (1 << VCPU_EXREG_CR3));
7697         vcpu->arch.regs_dirty = 0;
7698
7699         vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
7700
7701         vmx->loaded_vmcs->launched = 1;
7702
7703         vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
7704         trace_kvm_exit(vmx->exit_reason, vcpu, KVM_ISA_VMX);
7705
7706         /*
7707          * the KVM_REQ_EVENT optimization bit is only on for one entry, and if
7708          * we did not inject a still-pending event to L1 now because of
7709          * nested_run_pending, we need to re-enable this bit.
7710          */
7711         if (vmx->nested.nested_run_pending)
7712                 kvm_make_request(KVM_REQ_EVENT, vcpu);
7713
7714         vmx->nested.nested_run_pending = 0;
7715
7716         vmx_complete_atomic_exit(vmx);
7717         vmx_recover_nmi_blocking(vmx);
7718         vmx_complete_interrupts(vmx);
7719 }
7720
7721 static void vmx_load_vmcs01(struct kvm_vcpu *vcpu)
7722 {
7723         struct vcpu_vmx *vmx = to_vmx(vcpu);
7724         int cpu;
7725
7726         if (vmx->loaded_vmcs == &vmx->vmcs01)
7727                 return;
7728
7729         cpu = get_cpu();
7730         vmx->loaded_vmcs = &vmx->vmcs01;
7731         vmx_vcpu_put(vcpu);
7732         vmx_vcpu_load(vcpu, cpu);
7733         vcpu->cpu = cpu;
7734         put_cpu();
7735 }
7736
7737 static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
7738 {
7739         struct vcpu_vmx *vmx = to_vmx(vcpu);
7740
7741         free_vpid(vmx);
7742         leave_guest_mode(vcpu);
7743         vmx_load_vmcs01(vcpu);
7744         free_nested(vmx);
7745         free_loaded_vmcs(vmx->loaded_vmcs);
7746         kfree(vmx->guest_msrs);
7747         kvm_vcpu_uninit(vcpu);
7748         kmem_cache_free(kvm_vcpu_cache, vmx);
7749 }
7750
7751 static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
7752 {
7753         int err;
7754         struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
7755         int cpu;
7756
7757         if (!vmx)
7758                 return ERR_PTR(-ENOMEM);
7759
7760         allocate_vpid(vmx);
7761
7762         err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
7763         if (err)
7764                 goto free_vcpu;
7765
7766         vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
7767         BUILD_BUG_ON(ARRAY_SIZE(vmx_msr_index) * sizeof(vmx->guest_msrs[0])
7768                      > PAGE_SIZE);
7769
7770         err = -ENOMEM;
7771         if (!vmx->guest_msrs) {
7772                 goto uninit_vcpu;
7773         }
7774
7775         vmx->loaded_vmcs = &vmx->vmcs01;
7776         vmx->loaded_vmcs->vmcs = alloc_vmcs();
7777         if (!vmx->loaded_vmcs->vmcs)
7778                 goto free_msrs;
7779         if (!vmm_exclusive)
7780                 kvm_cpu_vmxon(__pa(per_cpu(vmxarea, raw_smp_processor_id())));
7781         loaded_vmcs_init(vmx->loaded_vmcs);
7782         if (!vmm_exclusive)
7783                 kvm_cpu_vmxoff();
7784
7785         cpu = get_cpu();
7786         vmx_vcpu_load(&vmx->vcpu, cpu);
7787         vmx->vcpu.cpu = cpu;
7788         err = vmx_vcpu_setup(vmx);
7789         vmx_vcpu_put(&vmx->vcpu);
7790         put_cpu();
7791         if (err)
7792                 goto free_vmcs;
7793         if (vm_need_virtualize_apic_accesses(kvm)) {
7794                 err = alloc_apic_access_page(kvm);
7795                 if (err)
7796                         goto free_vmcs;
7797         }
7798
7799         if (enable_ept) {
7800                 if (!kvm->arch.ept_identity_map_addr)
7801                         kvm->arch.ept_identity_map_addr =
7802                                 VMX_EPT_IDENTITY_PAGETABLE_ADDR;
7803                 err = init_rmode_identity_map(kvm);
7804                 if (err)
7805                         goto free_vmcs;
7806         }
7807
7808         vmx->nested.current_vmptr = -1ull;
7809         vmx->nested.current_vmcs12 = NULL;
7810
7811         return &vmx->vcpu;
7812
7813 free_vmcs:
7814         free_loaded_vmcs(vmx->loaded_vmcs);
7815 free_msrs:
7816         kfree(vmx->guest_msrs);
7817 uninit_vcpu:
7818         kvm_vcpu_uninit(&vmx->vcpu);
7819 free_vcpu:
7820         free_vpid(vmx);
7821         kmem_cache_free(kvm_vcpu_cache, vmx);
7822         return ERR_PTR(err);
7823 }
7824
7825 static void __init vmx_check_processor_compat(void *rtn)
7826 {
7827         struct vmcs_config vmcs_conf;
7828
7829         *(int *)rtn = 0;
7830         if (setup_vmcs_config(&vmcs_conf) < 0)
7831                 *(int *)rtn = -EIO;
7832         if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) {
7833                 printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n",
7834                                 smp_processor_id());
7835                 *(int *)rtn = -EIO;
7836         }
7837 }
7838
7839 static int get_ept_level(void)
7840 {
7841         return VMX_EPT_DEFAULT_GAW + 1;
7842 }
7843
7844 static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
7845 {
7846         u64 ret;
7847
7848         /* For VT-d and EPT combination
7849          * 1. MMIO: always map as UC
7850          * 2. EPT with VT-d:
7851          *   a. VT-d without snooping control feature: can't guarantee the
7852          *      result, try to trust guest.
7853          *   b. VT-d with snooping control feature: snooping control feature of
7854          *      VT-d engine can guarantee the cache correctness. Just set it
7855          *      to WB to keep consistent with host. So the same as item 3.
7856          * 3. EPT without VT-d: always map as WB and set IPAT=1 to keep
7857          *    consistent with host MTRR
7858          */
7859         if (is_mmio)
7860                 ret = MTRR_TYPE_UNCACHABLE << VMX_EPT_MT_EPTE_SHIFT;
7861         else if (kvm_arch_has_noncoherent_dma(vcpu->kvm))
7862                 ret = kvm_get_guest_memory_type(vcpu, gfn) <<
7863                       VMX_EPT_MT_EPTE_SHIFT;
7864         else
7865                 ret = (MTRR_TYPE_WRBACK << VMX_EPT_MT_EPTE_SHIFT)
7866                         | VMX_EPT_IPAT_BIT;
7867
7868         return ret;
7869 }
7870
7871 static int vmx_get_lpage_level(void)
7872 {
7873         if (enable_ept && !cpu_has_vmx_ept_1g_page())
7874                 return PT_DIRECTORY_LEVEL;
7875         else
7876                 /* For shadow and EPT supported 1GB page */
7877                 return PT_PDPE_LEVEL;
7878 }
7879
7880 static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
7881 {
7882         struct kvm_cpuid_entry2 *best;
7883         struct vcpu_vmx *vmx = to_vmx(vcpu);
7884         u32 exec_control;
7885
7886         vmx->rdtscp_enabled = false;
7887         if (vmx_rdtscp_supported()) {
7888                 exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
7889                 if (exec_control & SECONDARY_EXEC_RDTSCP) {
7890                         best = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
7891                         if (best && (best->edx & bit(X86_FEATURE_RDTSCP)))
7892                                 vmx->rdtscp_enabled = true;
7893                         else {
7894                                 exec_control &= ~SECONDARY_EXEC_RDTSCP;
7895                                 vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
7896                                                 exec_control);
7897                         }
7898                 }
7899         }
7900
7901         /* Exposing INVPCID only when PCID is exposed */
7902         best = kvm_find_cpuid_entry(vcpu, 0x7, 0);
7903         if (vmx_invpcid_supported() &&
7904             best && (best->ebx & bit(X86_FEATURE_INVPCID)) &&
7905             guest_cpuid_has_pcid(vcpu)) {
7906                 exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
7907                 exec_control |= SECONDARY_EXEC_ENABLE_INVPCID;
7908                 vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
7909                              exec_control);
7910         } else {
7911                 if (cpu_has_secondary_exec_ctrls()) {
7912                         exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
7913                         exec_control &= ~SECONDARY_EXEC_ENABLE_INVPCID;
7914                         vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
7915                                      exec_control);
7916                 }
7917                 if (best)
7918                         best->ebx &= ~bit(X86_FEATURE_INVPCID);
7919         }
7920 }
7921
7922 static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
7923 {
7924         if (func == 1 && nested)
7925                 entry->ecx |= bit(X86_FEATURE_VMX);
7926 }
7927
7928 static void nested_ept_inject_page_fault(struct kvm_vcpu *vcpu,
7929                 struct x86_exception *fault)
7930 {
7931         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
7932         u32 exit_reason;
7933
7934         if (fault->error_code & PFERR_RSVD_MASK)
7935                 exit_reason = EXIT_REASON_EPT_MISCONFIG;
7936         else
7937                 exit_reason = EXIT_REASON_EPT_VIOLATION;
7938         nested_vmx_vmexit(vcpu, exit_reason, 0, vcpu->arch.exit_qualification);
7939         vmcs12->guest_physical_address = fault->address;
7940 }
7941
7942 /* Callbacks for nested_ept_init_mmu_context: */
7943
7944 static unsigned long nested_ept_get_cr3(struct kvm_vcpu *vcpu)
7945 {
7946         /* return the page table to be shadowed - in our case, EPT12 */
7947         return get_vmcs12(vcpu)->ept_pointer;
7948 }
7949
7950 static void nested_ept_init_mmu_context(struct kvm_vcpu *vcpu)
7951 {
7952         kvm_init_shadow_ept_mmu(vcpu, &vcpu->arch.mmu,
7953                         nested_vmx_ept_caps & VMX_EPT_EXECUTE_ONLY_BIT);
7954
7955         vcpu->arch.mmu.set_cr3           = vmx_set_cr3;
7956         vcpu->arch.mmu.get_cr3           = nested_ept_get_cr3;
7957         vcpu->arch.mmu.inject_page_fault = nested_ept_inject_page_fault;
7958
7959         vcpu->arch.walk_mmu              = &vcpu->arch.nested_mmu;
7960 }
7961
7962 static void nested_ept_uninit_mmu_context(struct kvm_vcpu *vcpu)
7963 {
7964         vcpu->arch.walk_mmu = &vcpu->arch.mmu;
7965 }
7966
7967 static void vmx_inject_page_fault_nested(struct kvm_vcpu *vcpu,
7968                 struct x86_exception *fault)
7969 {
7970         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
7971
7972         WARN_ON(!is_guest_mode(vcpu));
7973
7974         /* TODO: also check PFEC_MATCH/MASK, not just EB.PF. */
7975         if (vmcs12->exception_bitmap & (1u << PF_VECTOR))
7976                 nested_vmx_vmexit(vcpu, to_vmx(vcpu)->exit_reason,
7977                                   vmcs_read32(VM_EXIT_INTR_INFO),
7978                                   vmcs_readl(EXIT_QUALIFICATION));
7979         else
7980                 kvm_inject_page_fault(vcpu, fault);
7981 }
7982
7983 static bool nested_get_vmcs12_pages(struct kvm_vcpu *vcpu,
7984                                         struct vmcs12 *vmcs12)
7985 {
7986         struct vcpu_vmx *vmx = to_vmx(vcpu);
7987
7988         if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) {
7989                 /* TODO: Also verify bits beyond physical address width are 0 */
7990                 if (!PAGE_ALIGNED(vmcs12->apic_access_addr))
7991                         return false;
7992
7993                 /*
7994                  * Translate L1 physical address to host physical
7995                  * address for vmcs02. Keep the page pinned, so this
7996                  * physical address remains valid. We keep a reference
7997                  * to it so we can release it later.
7998                  */
7999                 if (vmx->nested.apic_access_page) /* shouldn't happen */
8000                         nested_release_page(vmx->nested.apic_access_page);
8001                 vmx->nested.apic_access_page =
8002                         nested_get_page(vcpu, vmcs12->apic_access_addr);
8003         }
8004
8005         if (nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)) {
8006                 /* TODO: Also verify bits beyond physical address width are 0 */
8007                 if (!PAGE_ALIGNED(vmcs12->virtual_apic_page_addr))
8008                         return false;
8009
8010                 if (vmx->nested.virtual_apic_page) /* shouldn't happen */
8011                         nested_release_page(vmx->nested.virtual_apic_page);
8012                 vmx->nested.virtual_apic_page =
8013                         nested_get_page(vcpu, vmcs12->virtual_apic_page_addr);
8014
8015                 /*
8016                  * Failing the vm entry is _not_ what the processor does
8017                  * but it's basically the only possibility we have.
8018                  * We could still enter the guest if CR8 load exits are
8019                  * enabled, CR8 store exits are enabled, and virtualize APIC
8020                  * access is disabled; in this case the processor would never
8021                  * use the TPR shadow and we could simply clear the bit from
8022                  * the execution control.  But such a configuration is useless,
8023                  * so let's keep the code simple.
8024                  */
8025                 if (!vmx->nested.virtual_apic_page)
8026                         return false;
8027         }
8028
8029         return true;
8030 }
8031
8032 static void vmx_start_preemption_timer(struct kvm_vcpu *vcpu)
8033 {
8034         u64 preemption_timeout = get_vmcs12(vcpu)->vmx_preemption_timer_value;
8035         struct vcpu_vmx *vmx = to_vmx(vcpu);
8036
8037         if (vcpu->arch.virtual_tsc_khz == 0)
8038                 return;
8039
8040         /* Make sure short timeouts reliably trigger an immediate vmexit.
8041          * hrtimer_start does not guarantee this. */
8042         if (preemption_timeout <= 1) {
8043                 vmx_preemption_timer_fn(&vmx->nested.preemption_timer);
8044                 return;
8045         }
8046
8047         preemption_timeout <<= VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE;
8048         preemption_timeout *= 1000000;
8049         do_div(preemption_timeout, vcpu->arch.virtual_tsc_khz);
8050         hrtimer_start(&vmx->nested.preemption_timer,
8051                       ns_to_ktime(preemption_timeout), HRTIMER_MODE_REL);
8052 }
8053
8054 /*
8055  * prepare_vmcs02 is called when the L1 guest hypervisor runs its nested
8056  * L2 guest. L1 has a vmcs for L2 (vmcs12), and this function "merges" it
8057  * with L0's requirements for its guest (a.k.a. vmcs01), so we can run the L2
8058  * guest in a way that will both be appropriate to L1's requests, and our
8059  * needs. In addition to modifying the active vmcs (which is vmcs02), this
8060  * function also has additional necessary side-effects, like setting various
8061  * vcpu->arch fields.
8062  */
8063 static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
8064 {
8065         struct vcpu_vmx *vmx = to_vmx(vcpu);
8066         u32 exec_control;
8067
8068         vmcs_write16(GUEST_ES_SELECTOR, vmcs12->guest_es_selector);
8069         vmcs_write16(GUEST_CS_SELECTOR, vmcs12->guest_cs_selector);
8070         vmcs_write16(GUEST_SS_SELECTOR, vmcs12->guest_ss_selector);
8071         vmcs_write16(GUEST_DS_SELECTOR, vmcs12->guest_ds_selector);
8072         vmcs_write16(GUEST_FS_SELECTOR, vmcs12->guest_fs_selector);
8073         vmcs_write16(GUEST_GS_SELECTOR, vmcs12->guest_gs_selector);
8074         vmcs_write16(GUEST_LDTR_SELECTOR, vmcs12->guest_ldtr_selector);
8075         vmcs_write16(GUEST_TR_SELECTOR, vmcs12->guest_tr_selector);
8076         vmcs_write32(GUEST_ES_LIMIT, vmcs12->guest_es_limit);
8077         vmcs_write32(GUEST_CS_LIMIT, vmcs12->guest_cs_limit);
8078         vmcs_write32(GUEST_SS_LIMIT, vmcs12->guest_ss_limit);
8079         vmcs_write32(GUEST_DS_LIMIT, vmcs12->guest_ds_limit);
8080         vmcs_write32(GUEST_FS_LIMIT, vmcs12->guest_fs_limit);
8081         vmcs_write32(GUEST_GS_LIMIT, vmcs12->guest_gs_limit);
8082         vmcs_write32(GUEST_LDTR_LIMIT, vmcs12->guest_ldtr_limit);
8083         vmcs_write32(GUEST_TR_LIMIT, vmcs12->guest_tr_limit);
8084         vmcs_write32(GUEST_GDTR_LIMIT, vmcs12->guest_gdtr_limit);
8085         vmcs_write32(GUEST_IDTR_LIMIT, vmcs12->guest_idtr_limit);
8086         vmcs_write32(GUEST_ES_AR_BYTES, vmcs12->guest_es_ar_bytes);
8087         vmcs_write32(GUEST_CS_AR_BYTES, vmcs12->guest_cs_ar_bytes);
8088         vmcs_write32(GUEST_SS_AR_BYTES, vmcs12->guest_ss_ar_bytes);
8089         vmcs_write32(GUEST_DS_AR_BYTES, vmcs12->guest_ds_ar_bytes);
8090         vmcs_write32(GUEST_FS_AR_BYTES, vmcs12->guest_fs_ar_bytes);
8091         vmcs_write32(GUEST_GS_AR_BYTES, vmcs12->guest_gs_ar_bytes);
8092         vmcs_write32(GUEST_LDTR_AR_BYTES, vmcs12->guest_ldtr_ar_bytes);
8093         vmcs_write32(GUEST_TR_AR_BYTES, vmcs12->guest_tr_ar_bytes);
8094         vmcs_writel(GUEST_ES_BASE, vmcs12->guest_es_base);
8095         vmcs_writel(GUEST_CS_BASE, vmcs12->guest_cs_base);
8096         vmcs_writel(GUEST_SS_BASE, vmcs12->guest_ss_base);
8097         vmcs_writel(GUEST_DS_BASE, vmcs12->guest_ds_base);
8098         vmcs_writel(GUEST_FS_BASE, vmcs12->guest_fs_base);
8099         vmcs_writel(GUEST_GS_BASE, vmcs12->guest_gs_base);
8100         vmcs_writel(GUEST_LDTR_BASE, vmcs12->guest_ldtr_base);
8101         vmcs_writel(GUEST_TR_BASE, vmcs12->guest_tr_base);
8102         vmcs_writel(GUEST_GDTR_BASE, vmcs12->guest_gdtr_base);
8103         vmcs_writel(GUEST_IDTR_BASE, vmcs12->guest_idtr_base);
8104
8105         if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS) {
8106                 kvm_set_dr(vcpu, 7, vmcs12->guest_dr7);
8107                 vmcs_write64(GUEST_IA32_DEBUGCTL, vmcs12->guest_ia32_debugctl);
8108         } else {
8109                 kvm_set_dr(vcpu, 7, vcpu->arch.dr7);
8110                 vmcs_write64(GUEST_IA32_DEBUGCTL, vmx->nested.vmcs01_debugctl);
8111         }
8112         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
8113                 vmcs12->vm_entry_intr_info_field);
8114         vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE,
8115                 vmcs12->vm_entry_exception_error_code);
8116         vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
8117                 vmcs12->vm_entry_instruction_len);
8118         vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
8119                 vmcs12->guest_interruptibility_info);
8120         vmcs_write32(GUEST_SYSENTER_CS, vmcs12->guest_sysenter_cs);
8121         vmx_set_rflags(vcpu, vmcs12->guest_rflags);
8122         vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS,
8123                 vmcs12->guest_pending_dbg_exceptions);
8124         vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->guest_sysenter_esp);
8125         vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->guest_sysenter_eip);
8126
8127         vmcs_write64(VMCS_LINK_POINTER, -1ull);
8128
8129         exec_control = vmcs12->pin_based_vm_exec_control;
8130         exec_control |= vmcs_config.pin_based_exec_ctrl;
8131         exec_control &= ~(PIN_BASED_VMX_PREEMPTION_TIMER |
8132                           PIN_BASED_POSTED_INTR);
8133         vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, exec_control);
8134
8135         vmx->nested.preemption_timer_expired = false;
8136         if (nested_cpu_has_preemption_timer(vmcs12))
8137                 vmx_start_preemption_timer(vcpu);
8138
8139         /*
8140          * Whether page-faults are trapped is determined by a combination of
8141          * 3 settings: PFEC_MASK, PFEC_MATCH and EXCEPTION_BITMAP.PF.
8142          * If enable_ept, L0 doesn't care about page faults and we should
8143          * set all of these to L1's desires. However, if !enable_ept, L0 does
8144          * care about (at least some) page faults, and because it is not easy
8145          * (if at all possible?) to merge L0 and L1's desires, we simply ask
8146          * to exit on each and every L2 page fault. This is done by setting
8147          * MASK=MATCH=0 and (see below) EB.PF=1.
8148          * Note that below we don't need special code to set EB.PF beyond the
8149          * "or"ing of the EB of vmcs01 and vmcs12, because when enable_ept,
8150          * vmcs01's EB.PF is 0 so the "or" will take vmcs12's value, and when
8151          * !enable_ept, EB.PF is 1, so the "or" will always be 1.
8152          *
8153          * A problem with this approach (when !enable_ept) is that L1 may be
8154          * injected with more page faults than it asked for. This could have
8155          * caused problems, but in practice existing hypervisors don't care.
8156          * To fix this, we will need to emulate the PFEC checking (on the L1
8157          * page tables), using walk_addr(), when injecting PFs to L1.
8158          */
8159         vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK,
8160                 enable_ept ? vmcs12->page_fault_error_code_mask : 0);
8161         vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH,
8162                 enable_ept ? vmcs12->page_fault_error_code_match : 0);
8163
8164         if (cpu_has_secondary_exec_ctrls()) {
8165                 exec_control = vmx_secondary_exec_control(vmx);
8166                 if (!vmx->rdtscp_enabled)
8167                         exec_control &= ~SECONDARY_EXEC_RDTSCP;
8168                 /* Take the following fields only from vmcs12 */
8169                 exec_control &= ~(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
8170                                   SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
8171                                   SECONDARY_EXEC_APIC_REGISTER_VIRT);
8172                 if (nested_cpu_has(vmcs12,
8173                                 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS))
8174                         exec_control |= vmcs12->secondary_vm_exec_control;
8175
8176                 if (exec_control & SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES) {
8177                         /*
8178                          * If translation failed, no matter: This feature asks
8179                          * to exit when accessing the given address, and if it
8180                          * can never be accessed, this feature won't do
8181                          * anything anyway.
8182                          */
8183                         if (!vmx->nested.apic_access_page)
8184                                 exec_control &=
8185                                   ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
8186                         else
8187                                 vmcs_write64(APIC_ACCESS_ADDR,
8188                                   page_to_phys(vmx->nested.apic_access_page));
8189                 } else if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm)) {
8190                         exec_control |=
8191                                 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
8192                         kvm_vcpu_reload_apic_access_page(vcpu);
8193                 }
8194
8195                 vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
8196         }
8197
8198
8199         /*
8200          * Set host-state according to L0's settings (vmcs12 is irrelevant here)
8201          * Some constant fields are set here by vmx_set_constant_host_state().
8202          * Other fields are different per CPU, and will be set later when
8203          * vmx_vcpu_load() is called, and when vmx_save_host_state() is called.
8204          */
8205         vmx_set_constant_host_state(vmx);
8206
8207         /*
8208          * HOST_RSP is normally set correctly in vmx_vcpu_run() just before
8209          * entry, but only if the current (host) sp changed from the value
8210          * we wrote last (vmx->host_rsp). This cache is no longer relevant
8211          * if we switch vmcs, and rather than hold a separate cache per vmcs,
8212          * here we just force the write to happen on entry.
8213          */
8214         vmx->host_rsp = 0;
8215
8216         exec_control = vmx_exec_control(vmx); /* L0's desires */
8217         exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
8218         exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
8219         exec_control &= ~CPU_BASED_TPR_SHADOW;
8220         exec_control |= vmcs12->cpu_based_vm_exec_control;
8221
8222         if (exec_control & CPU_BASED_TPR_SHADOW) {
8223                 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR,
8224                                 page_to_phys(vmx->nested.virtual_apic_page));
8225                 vmcs_write32(TPR_THRESHOLD, vmcs12->tpr_threshold);
8226         }
8227
8228         /*
8229          * Merging of IO and MSR bitmaps not currently supported.
8230          * Rather, exit every time.
8231          */
8232         exec_control &= ~CPU_BASED_USE_MSR_BITMAPS;
8233         exec_control &= ~CPU_BASED_USE_IO_BITMAPS;
8234         exec_control |= CPU_BASED_UNCOND_IO_EXITING;
8235
8236         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
8237
8238         /* EXCEPTION_BITMAP and CR0_GUEST_HOST_MASK should basically be the
8239          * bitwise-or of what L1 wants to trap for L2, and what we want to
8240          * trap. Note that CR0.TS also needs updating - we do this later.
8241          */
8242         update_exception_bitmap(vcpu);
8243         vcpu->arch.cr0_guest_owned_bits &= ~vmcs12->cr0_guest_host_mask;
8244         vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
8245
8246         /* L2->L1 exit controls are emulated - the hardware exit is to L0 so
8247          * we should use its exit controls. Note that VM_EXIT_LOAD_IA32_EFER
8248          * bits are further modified by vmx_set_efer() below.
8249          */
8250         vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
8251
8252         /* vmcs12's VM_ENTRY_LOAD_IA32_EFER and VM_ENTRY_IA32E_MODE are
8253          * emulated by vmx_set_efer(), below.
8254          */
8255         vm_entry_controls_init(vmx,
8256                 (vmcs12->vm_entry_controls & ~VM_ENTRY_LOAD_IA32_EFER &
8257                         ~VM_ENTRY_IA32E_MODE) |
8258                 (vmcs_config.vmentry_ctrl & ~VM_ENTRY_IA32E_MODE));
8259
8260         if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PAT) {
8261                 vmcs_write64(GUEST_IA32_PAT, vmcs12->guest_ia32_pat);
8262                 vcpu->arch.pat = vmcs12->guest_ia32_pat;
8263         } else if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT)
8264                 vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat);
8265
8266
8267         set_cr4_guest_host_mask(vmx);
8268
8269         if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS)
8270                 vmcs_write64(GUEST_BNDCFGS, vmcs12->guest_bndcfgs);
8271
8272         if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING)
8273                 vmcs_write64(TSC_OFFSET,
8274                         vmx->nested.vmcs01_tsc_offset + vmcs12->tsc_offset);
8275         else
8276                 vmcs_write64(TSC_OFFSET, vmx->nested.vmcs01_tsc_offset);
8277
8278         if (enable_vpid) {
8279                 /*
8280                  * Trivially support vpid by letting L2s share their parent
8281                  * L1's vpid. TODO: move to a more elaborate solution, giving
8282                  * each L2 its own vpid and exposing the vpid feature to L1.
8283                  */
8284                 vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
8285                 vmx_flush_tlb(vcpu);
8286         }
8287
8288         if (nested_cpu_has_ept(vmcs12)) {
8289                 kvm_mmu_unload(vcpu);
8290                 nested_ept_init_mmu_context(vcpu);
8291         }
8292
8293         if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER)
8294                 vcpu->arch.efer = vmcs12->guest_ia32_efer;
8295         else if (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE)
8296                 vcpu->arch.efer |= (EFER_LMA | EFER_LME);
8297         else
8298                 vcpu->arch.efer &= ~(EFER_LMA | EFER_LME);
8299         /* Note: modifies VM_ENTRY/EXIT_CONTROLS and GUEST/HOST_IA32_EFER */
8300         vmx_set_efer(vcpu, vcpu->arch.efer);
8301
8302         /*
8303          * This sets GUEST_CR0 to vmcs12->guest_cr0, with possibly a modified
8304          * TS bit (for lazy fpu) and bits which we consider mandatory enabled.
8305          * The CR0_READ_SHADOW is what L2 should have expected to read given
8306          * the specifications by L1; It's not enough to take
8307          * vmcs12->cr0_read_shadow because on our cr0_guest_host_mask we we
8308          * have more bits than L1 expected.
8309          */
8310         vmx_set_cr0(vcpu, vmcs12->guest_cr0);
8311         vmcs_writel(CR0_READ_SHADOW, nested_read_cr0(vmcs12));
8312
8313         vmx_set_cr4(vcpu, vmcs12->guest_cr4);
8314         vmcs_writel(CR4_READ_SHADOW, nested_read_cr4(vmcs12));
8315
8316         /* shadow page tables on either EPT or shadow page tables */
8317         kvm_set_cr3(vcpu, vmcs12->guest_cr3);
8318         kvm_mmu_reset_context(vcpu);
8319
8320         if (!enable_ept)
8321                 vcpu->arch.walk_mmu->inject_page_fault = vmx_inject_page_fault_nested;
8322
8323         /*
8324          * L1 may access the L2's PDPTR, so save them to construct vmcs12
8325          */
8326         if (enable_ept) {
8327                 vmcs_write64(GUEST_PDPTR0, vmcs12->guest_pdptr0);
8328                 vmcs_write64(GUEST_PDPTR1, vmcs12->guest_pdptr1);
8329                 vmcs_write64(GUEST_PDPTR2, vmcs12->guest_pdptr2);
8330                 vmcs_write64(GUEST_PDPTR3, vmcs12->guest_pdptr3);
8331         }
8332
8333         kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->guest_rsp);
8334         kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->guest_rip);
8335 }
8336
8337 /*
8338  * nested_vmx_run() handles a nested entry, i.e., a VMLAUNCH or VMRESUME on L1
8339  * for running an L2 nested guest.
8340  */
8341 static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
8342 {
8343         struct vmcs12 *vmcs12;
8344         struct vcpu_vmx *vmx = to_vmx(vcpu);
8345         int cpu;
8346         struct loaded_vmcs *vmcs02;
8347         bool ia32e;
8348
8349         if (!nested_vmx_check_permission(vcpu) ||
8350             !nested_vmx_check_vmcs12(vcpu))
8351                 return 1;
8352
8353         skip_emulated_instruction(vcpu);
8354         vmcs12 = get_vmcs12(vcpu);
8355
8356         if (enable_shadow_vmcs)
8357                 copy_shadow_to_vmcs12(vmx);
8358
8359         /*
8360          * The nested entry process starts with enforcing various prerequisites
8361          * on vmcs12 as required by the Intel SDM, and act appropriately when
8362          * they fail: As the SDM explains, some conditions should cause the
8363          * instruction to fail, while others will cause the instruction to seem
8364          * to succeed, but return an EXIT_REASON_INVALID_STATE.
8365          * To speed up the normal (success) code path, we should avoid checking
8366          * for misconfigurations which will anyway be caught by the processor
8367          * when using the merged vmcs02.
8368          */
8369         if (vmcs12->launch_state == launch) {
8370                 nested_vmx_failValid(vcpu,
8371                         launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS
8372                                : VMXERR_VMRESUME_NONLAUNCHED_VMCS);
8373                 return 1;
8374         }
8375
8376         if (vmcs12->guest_activity_state != GUEST_ACTIVITY_ACTIVE &&
8377             vmcs12->guest_activity_state != GUEST_ACTIVITY_HLT) {
8378                 nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
8379                 return 1;
8380         }
8381
8382         if ((vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_MSR_BITMAPS) &&
8383                         !PAGE_ALIGNED(vmcs12->msr_bitmap)) {
8384                 /*TODO: Also verify bits beyond physical address width are 0*/
8385                 nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
8386                 return 1;
8387         }
8388
8389         if (!nested_get_vmcs12_pages(vcpu, vmcs12)) {
8390                 /*TODO: Also verify bits beyond physical address width are 0*/
8391                 nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
8392                 return 1;
8393         }
8394
8395         if (vmcs12->vm_entry_msr_load_count > 0 ||
8396             vmcs12->vm_exit_msr_load_count > 0 ||
8397             vmcs12->vm_exit_msr_store_count > 0) {
8398                 pr_warn_ratelimited("%s: VMCS MSR_{LOAD,STORE} unsupported\n",
8399                                     __func__);
8400                 nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
8401                 return 1;
8402         }
8403
8404         if (!vmx_control_verify(vmcs12->cpu_based_vm_exec_control,
8405                                 nested_vmx_true_procbased_ctls_low,
8406                                 nested_vmx_procbased_ctls_high) ||
8407             !vmx_control_verify(vmcs12->secondary_vm_exec_control,
8408               nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high) ||
8409             !vmx_control_verify(vmcs12->pin_based_vm_exec_control,
8410               nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high) ||
8411             !vmx_control_verify(vmcs12->vm_exit_controls,
8412                                 nested_vmx_true_exit_ctls_low,
8413                                 nested_vmx_exit_ctls_high) ||
8414             !vmx_control_verify(vmcs12->vm_entry_controls,
8415                                 nested_vmx_true_entry_ctls_low,
8416                                 nested_vmx_entry_ctls_high))
8417         {
8418                 nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
8419                 return 1;
8420         }
8421
8422         if (((vmcs12->host_cr0 & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON) ||
8423             ((vmcs12->host_cr4 & VMXON_CR4_ALWAYSON) != VMXON_CR4_ALWAYSON)) {
8424                 nested_vmx_failValid(vcpu,
8425                         VMXERR_ENTRY_INVALID_HOST_STATE_FIELD);
8426                 return 1;
8427         }
8428
8429         if (!nested_cr0_valid(vmcs12, vmcs12->guest_cr0) ||
8430             ((vmcs12->guest_cr4 & VMXON_CR4_ALWAYSON) != VMXON_CR4_ALWAYSON)) {
8431                 nested_vmx_entry_failure(vcpu, vmcs12,
8432                         EXIT_REASON_INVALID_STATE, ENTRY_FAIL_DEFAULT);
8433                 return 1;
8434         }
8435         if (vmcs12->vmcs_link_pointer != -1ull) {
8436                 nested_vmx_entry_failure(vcpu, vmcs12,
8437                         EXIT_REASON_INVALID_STATE, ENTRY_FAIL_VMCS_LINK_PTR);
8438                 return 1;
8439         }
8440
8441         /*
8442          * If the load IA32_EFER VM-entry control is 1, the following checks
8443          * are performed on the field for the IA32_EFER MSR:
8444          * - Bits reserved in the IA32_EFER MSR must be 0.
8445          * - Bit 10 (corresponding to IA32_EFER.LMA) must equal the value of
8446          *   the IA-32e mode guest VM-exit control. It must also be identical
8447          *   to bit 8 (LME) if bit 31 in the CR0 field (corresponding to
8448          *   CR0.PG) is 1.
8449          */
8450         if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER) {
8451                 ia32e = (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) != 0;
8452                 if (!kvm_valid_efer(vcpu, vmcs12->guest_ia32_efer) ||
8453                     ia32e != !!(vmcs12->guest_ia32_efer & EFER_LMA) ||
8454                     ((vmcs12->guest_cr0 & X86_CR0_PG) &&
8455                      ia32e != !!(vmcs12->guest_ia32_efer & EFER_LME))) {
8456                         nested_vmx_entry_failure(vcpu, vmcs12,
8457                                 EXIT_REASON_INVALID_STATE, ENTRY_FAIL_DEFAULT);
8458                         return 1;
8459                 }
8460         }
8461
8462         /*
8463          * If the load IA32_EFER VM-exit control is 1, bits reserved in the
8464          * IA32_EFER MSR must be 0 in the field for that register. In addition,
8465          * the values of the LMA and LME bits in the field must each be that of
8466          * the host address-space size VM-exit control.
8467          */
8468         if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_EFER) {
8469                 ia32e = (vmcs12->vm_exit_controls &
8470                          VM_EXIT_HOST_ADDR_SPACE_SIZE) != 0;
8471                 if (!kvm_valid_efer(vcpu, vmcs12->host_ia32_efer) ||
8472                     ia32e != !!(vmcs12->host_ia32_efer & EFER_LMA) ||
8473                     ia32e != !!(vmcs12->host_ia32_efer & EFER_LME)) {
8474                         nested_vmx_entry_failure(vcpu, vmcs12,
8475                                 EXIT_REASON_INVALID_STATE, ENTRY_FAIL_DEFAULT);
8476                         return 1;
8477                 }
8478         }
8479
8480         /*
8481          * We're finally done with prerequisite checking, and can start with
8482          * the nested entry.
8483          */
8484
8485         vmcs02 = nested_get_current_vmcs02(vmx);
8486         if (!vmcs02)
8487                 return -ENOMEM;
8488
8489         enter_guest_mode(vcpu);
8490
8491         vmx->nested.vmcs01_tsc_offset = vmcs_read64(TSC_OFFSET);
8492
8493         if (!(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS))
8494                 vmx->nested.vmcs01_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
8495
8496         cpu = get_cpu();
8497         vmx->loaded_vmcs = vmcs02;
8498         vmx_vcpu_put(vcpu);
8499         vmx_vcpu_load(vcpu, cpu);
8500         vcpu->cpu = cpu;
8501         put_cpu();
8502
8503         vmx_segment_cache_clear(vmx);
8504
8505         vmcs12->launch_state = 1;
8506
8507         prepare_vmcs02(vcpu, vmcs12);
8508
8509         if (vmcs12->guest_activity_state == GUEST_ACTIVITY_HLT)
8510                 return kvm_emulate_halt(vcpu);
8511
8512         vmx->nested.nested_run_pending = 1;
8513
8514         /*
8515          * Note no nested_vmx_succeed or nested_vmx_fail here. At this point
8516          * we are no longer running L1, and VMLAUNCH/VMRESUME has not yet
8517          * returned as far as L1 is concerned. It will only return (and set
8518          * the success flag) when L2 exits (see nested_vmx_vmexit()).
8519          */
8520         return 1;
8521 }
8522
8523 /*
8524  * On a nested exit from L2 to L1, vmcs12.guest_cr0 might not be up-to-date
8525  * because L2 may have changed some cr0 bits directly (CRO_GUEST_HOST_MASK).
8526  * This function returns the new value we should put in vmcs12.guest_cr0.
8527  * It's not enough to just return the vmcs02 GUEST_CR0. Rather,
8528  *  1. Bits that neither L0 nor L1 trapped, were set directly by L2 and are now
8529  *     available in vmcs02 GUEST_CR0. (Note: It's enough to check that L0
8530  *     didn't trap the bit, because if L1 did, so would L0).
8531  *  2. Bits that L1 asked to trap (and therefore L0 also did) could not have
8532  *     been modified by L2, and L1 knows it. So just leave the old value of
8533  *     the bit from vmcs12.guest_cr0. Note that the bit from vmcs02 GUEST_CR0
8534  *     isn't relevant, because if L0 traps this bit it can set it to anything.
8535  *  3. Bits that L1 didn't trap, but L0 did. L1 believes the guest could have
8536  *     changed these bits, and therefore they need to be updated, but L0
8537  *     didn't necessarily allow them to be changed in GUEST_CR0 - and rather
8538  *     put them in vmcs02 CR0_READ_SHADOW. So take these bits from there.
8539  */
8540 static inline unsigned long
8541 vmcs12_guest_cr0(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
8542 {
8543         return
8544         /*1*/   (vmcs_readl(GUEST_CR0) & vcpu->arch.cr0_guest_owned_bits) |
8545         /*2*/   (vmcs12->guest_cr0 & vmcs12->cr0_guest_host_mask) |
8546         /*3*/   (vmcs_readl(CR0_READ_SHADOW) & ~(vmcs12->cr0_guest_host_mask |
8547                         vcpu->arch.cr0_guest_owned_bits));
8548 }
8549
8550 static inline unsigned long
8551 vmcs12_guest_cr4(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
8552 {
8553         return
8554         /*1*/   (vmcs_readl(GUEST_CR4) & vcpu->arch.cr4_guest_owned_bits) |
8555         /*2*/   (vmcs12->guest_cr4 & vmcs12->cr4_guest_host_mask) |
8556         /*3*/   (vmcs_readl(CR4_READ_SHADOW) & ~(vmcs12->cr4_guest_host_mask |
8557                         vcpu->arch.cr4_guest_owned_bits));
8558 }
8559
8560 static void vmcs12_save_pending_event(struct kvm_vcpu *vcpu,
8561                                        struct vmcs12 *vmcs12)
8562 {
8563         u32 idt_vectoring;
8564         unsigned int nr;
8565
8566         if (vcpu->arch.exception.pending && vcpu->arch.exception.reinject) {
8567                 nr = vcpu->arch.exception.nr;
8568                 idt_vectoring = nr | VECTORING_INFO_VALID_MASK;
8569
8570                 if (kvm_exception_is_soft(nr)) {
8571                         vmcs12->vm_exit_instruction_len =
8572                                 vcpu->arch.event_exit_inst_len;
8573                         idt_vectoring |= INTR_TYPE_SOFT_EXCEPTION;
8574                 } else
8575                         idt_vectoring |= INTR_TYPE_HARD_EXCEPTION;
8576
8577                 if (vcpu->arch.exception.has_error_code) {
8578                         idt_vectoring |= VECTORING_INFO_DELIVER_CODE_MASK;
8579                         vmcs12->idt_vectoring_error_code =
8580                                 vcpu->arch.exception.error_code;
8581                 }
8582
8583                 vmcs12->idt_vectoring_info_field = idt_vectoring;
8584         } else if (vcpu->arch.nmi_injected) {
8585                 vmcs12->idt_vectoring_info_field =
8586                         INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR;
8587         } else if (vcpu->arch.interrupt.pending) {
8588                 nr = vcpu->arch.interrupt.nr;
8589                 idt_vectoring = nr | VECTORING_INFO_VALID_MASK;
8590
8591                 if (vcpu->arch.interrupt.soft) {
8592                         idt_vectoring |= INTR_TYPE_SOFT_INTR;
8593                         vmcs12->vm_entry_instruction_len =
8594                                 vcpu->arch.event_exit_inst_len;
8595                 } else
8596                         idt_vectoring |= INTR_TYPE_EXT_INTR;
8597
8598                 vmcs12->idt_vectoring_info_field = idt_vectoring;
8599         }
8600 }
8601
8602 static int vmx_check_nested_events(struct kvm_vcpu *vcpu, bool external_intr)
8603 {
8604         struct vcpu_vmx *vmx = to_vmx(vcpu);
8605
8606         if (nested_cpu_has_preemption_timer(get_vmcs12(vcpu)) &&
8607             vmx->nested.preemption_timer_expired) {
8608                 if (vmx->nested.nested_run_pending)
8609                         return -EBUSY;
8610                 nested_vmx_vmexit(vcpu, EXIT_REASON_PREEMPTION_TIMER, 0, 0);
8611                 return 0;
8612         }
8613
8614         if (vcpu->arch.nmi_pending && nested_exit_on_nmi(vcpu)) {
8615                 if (vmx->nested.nested_run_pending ||
8616                     vcpu->arch.interrupt.pending)
8617                         return -EBUSY;
8618                 nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI,
8619                                   NMI_VECTOR | INTR_TYPE_NMI_INTR |
8620                                   INTR_INFO_VALID_MASK, 0);
8621                 /*
8622                  * The NMI-triggered VM exit counts as injection:
8623                  * clear this one and block further NMIs.
8624                  */
8625                 vcpu->arch.nmi_pending = 0;
8626                 vmx_set_nmi_mask(vcpu, true);
8627                 return 0;
8628         }
8629
8630         if ((kvm_cpu_has_interrupt(vcpu) || external_intr) &&
8631             nested_exit_on_intr(vcpu)) {
8632                 if (vmx->nested.nested_run_pending)
8633                         return -EBUSY;
8634                 nested_vmx_vmexit(vcpu, EXIT_REASON_EXTERNAL_INTERRUPT, 0, 0);
8635         }
8636
8637         return 0;
8638 }
8639
8640 static u32 vmx_get_preemption_timer_value(struct kvm_vcpu *vcpu)
8641 {
8642         ktime_t remaining =
8643                 hrtimer_get_remaining(&to_vmx(vcpu)->nested.preemption_timer);
8644         u64 value;
8645
8646         if (ktime_to_ns(remaining) <= 0)
8647                 return 0;
8648
8649         value = ktime_to_ns(remaining) * vcpu->arch.virtual_tsc_khz;
8650         do_div(value, 1000000);
8651         return value >> VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE;
8652 }
8653
8654 /*
8655  * prepare_vmcs12 is part of what we need to do when the nested L2 guest exits
8656  * and we want to prepare to run its L1 parent. L1 keeps a vmcs for L2 (vmcs12),
8657  * and this function updates it to reflect the changes to the guest state while
8658  * L2 was running (and perhaps made some exits which were handled directly by L0
8659  * without going back to L1), and to reflect the exit reason.
8660  * Note that we do not have to copy here all VMCS fields, just those that
8661  * could have changed by the L2 guest or the exit - i.e., the guest-state and
8662  * exit-information fields only. Other fields are modified by L1 with VMWRITE,
8663  * which already writes to vmcs12 directly.
8664  */
8665 static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
8666                            u32 exit_reason, u32 exit_intr_info,
8667                            unsigned long exit_qualification)
8668 {
8669         /* update guest state fields: */
8670         vmcs12->guest_cr0 = vmcs12_guest_cr0(vcpu, vmcs12);
8671         vmcs12->guest_cr4 = vmcs12_guest_cr4(vcpu, vmcs12);
8672
8673         vmcs12->guest_rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
8674         vmcs12->guest_rip = kvm_register_read(vcpu, VCPU_REGS_RIP);
8675         vmcs12->guest_rflags = vmcs_readl(GUEST_RFLAGS);
8676
8677         vmcs12->guest_es_selector = vmcs_read16(GUEST_ES_SELECTOR);
8678         vmcs12->guest_cs_selector = vmcs_read16(GUEST_CS_SELECTOR);
8679         vmcs12->guest_ss_selector = vmcs_read16(GUEST_SS_SELECTOR);
8680         vmcs12->guest_ds_selector = vmcs_read16(GUEST_DS_SELECTOR);
8681         vmcs12->guest_fs_selector = vmcs_read16(GUEST_FS_SELECTOR);
8682         vmcs12->guest_gs_selector = vmcs_read16(GUEST_GS_SELECTOR);
8683         vmcs12->guest_ldtr_selector = vmcs_read16(GUEST_LDTR_SELECTOR);
8684         vmcs12->guest_tr_selector = vmcs_read16(GUEST_TR_SELECTOR);
8685         vmcs12->guest_es_limit = vmcs_read32(GUEST_ES_LIMIT);
8686         vmcs12->guest_cs_limit = vmcs_read32(GUEST_CS_LIMIT);
8687         vmcs12->guest_ss_limit = vmcs_read32(GUEST_SS_LIMIT);
8688         vmcs12->guest_ds_limit = vmcs_read32(GUEST_DS_LIMIT);
8689         vmcs12->guest_fs_limit = vmcs_read32(GUEST_FS_LIMIT);
8690         vmcs12->guest_gs_limit = vmcs_read32(GUEST_GS_LIMIT);
8691         vmcs12->guest_ldtr_limit = vmcs_read32(GUEST_LDTR_LIMIT);
8692         vmcs12->guest_tr_limit = vmcs_read32(GUEST_TR_LIMIT);
8693         vmcs12->guest_gdtr_limit = vmcs_read32(GUEST_GDTR_LIMIT);
8694         vmcs12->guest_idtr_limit = vmcs_read32(GUEST_IDTR_LIMIT);
8695         vmcs12->guest_es_ar_bytes = vmcs_read32(GUEST_ES_AR_BYTES);
8696         vmcs12->guest_cs_ar_bytes = vmcs_read32(GUEST_CS_AR_BYTES);
8697         vmcs12->guest_ss_ar_bytes = vmcs_read32(GUEST_SS_AR_BYTES);
8698         vmcs12->guest_ds_ar_bytes = vmcs_read32(GUEST_DS_AR_BYTES);
8699         vmcs12->guest_fs_ar_bytes = vmcs_read32(GUEST_FS_AR_BYTES);
8700         vmcs12->guest_gs_ar_bytes = vmcs_read32(GUEST_GS_AR_BYTES);
8701         vmcs12->guest_ldtr_ar_bytes = vmcs_read32(GUEST_LDTR_AR_BYTES);
8702         vmcs12->guest_tr_ar_bytes = vmcs_read32(GUEST_TR_AR_BYTES);
8703         vmcs12->guest_es_base = vmcs_readl(GUEST_ES_BASE);
8704         vmcs12->guest_cs_base = vmcs_readl(GUEST_CS_BASE);
8705         vmcs12->guest_ss_base = vmcs_readl(GUEST_SS_BASE);
8706         vmcs12->guest_ds_base = vmcs_readl(GUEST_DS_BASE);
8707         vmcs12->guest_fs_base = vmcs_readl(GUEST_FS_BASE);
8708         vmcs12->guest_gs_base = vmcs_readl(GUEST_GS_BASE);
8709         vmcs12->guest_ldtr_base = vmcs_readl(GUEST_LDTR_BASE);
8710         vmcs12->guest_tr_base = vmcs_readl(GUEST_TR_BASE);
8711         vmcs12->guest_gdtr_base = vmcs_readl(GUEST_GDTR_BASE);
8712         vmcs12->guest_idtr_base = vmcs_readl(GUEST_IDTR_BASE);
8713
8714         vmcs12->guest_interruptibility_info =
8715                 vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
8716         vmcs12->guest_pending_dbg_exceptions =
8717                 vmcs_readl(GUEST_PENDING_DBG_EXCEPTIONS);
8718         if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED)
8719                 vmcs12->guest_activity_state = GUEST_ACTIVITY_HLT;
8720         else
8721                 vmcs12->guest_activity_state = GUEST_ACTIVITY_ACTIVE;
8722
8723         if (nested_cpu_has_preemption_timer(vmcs12)) {
8724                 if (vmcs12->vm_exit_controls &
8725                     VM_EXIT_SAVE_VMX_PREEMPTION_TIMER)
8726                         vmcs12->vmx_preemption_timer_value =
8727                                 vmx_get_preemption_timer_value(vcpu);
8728                 hrtimer_cancel(&to_vmx(vcpu)->nested.preemption_timer);
8729         }
8730
8731         /*
8732          * In some cases (usually, nested EPT), L2 is allowed to change its
8733          * own CR3 without exiting. If it has changed it, we must keep it.
8734          * Of course, if L0 is using shadow page tables, GUEST_CR3 was defined
8735          * by L0, not L1 or L2, so we mustn't unconditionally copy it to vmcs12.
8736          *
8737          * Additionally, restore L2's PDPTR to vmcs12.
8738          */
8739         if (enable_ept) {
8740                 vmcs12->guest_cr3 = vmcs_read64(GUEST_CR3);
8741                 vmcs12->guest_pdptr0 = vmcs_read64(GUEST_PDPTR0);
8742                 vmcs12->guest_pdptr1 = vmcs_read64(GUEST_PDPTR1);
8743                 vmcs12->guest_pdptr2 = vmcs_read64(GUEST_PDPTR2);
8744                 vmcs12->guest_pdptr3 = vmcs_read64(GUEST_PDPTR3);
8745         }
8746
8747         vmcs12->vm_entry_controls =
8748                 (vmcs12->vm_entry_controls & ~VM_ENTRY_IA32E_MODE) |
8749                 (vm_entry_controls_get(to_vmx(vcpu)) & VM_ENTRY_IA32E_MODE);
8750
8751         if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_DEBUG_CONTROLS) {
8752                 kvm_get_dr(vcpu, 7, (unsigned long *)&vmcs12->guest_dr7);
8753                 vmcs12->guest_ia32_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
8754         }
8755
8756         /* TODO: These cannot have changed unless we have MSR bitmaps and
8757          * the relevant bit asks not to trap the change */
8758         if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_IA32_PAT)
8759                 vmcs12->guest_ia32_pat = vmcs_read64(GUEST_IA32_PAT);
8760         if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_IA32_EFER)
8761                 vmcs12->guest_ia32_efer = vcpu->arch.efer;
8762         vmcs12->guest_sysenter_cs = vmcs_read32(GUEST_SYSENTER_CS);
8763         vmcs12->guest_sysenter_esp = vmcs_readl(GUEST_SYSENTER_ESP);
8764         vmcs12->guest_sysenter_eip = vmcs_readl(GUEST_SYSENTER_EIP);
8765         if (vmx_mpx_supported())
8766                 vmcs12->guest_bndcfgs = vmcs_read64(GUEST_BNDCFGS);
8767
8768         /* update exit information fields: */
8769
8770         vmcs12->vm_exit_reason = exit_reason;
8771         vmcs12->exit_qualification = exit_qualification;
8772
8773         vmcs12->vm_exit_intr_info = exit_intr_info;
8774         if ((vmcs12->vm_exit_intr_info &
8775              (INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK)) ==
8776             (INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK))
8777                 vmcs12->vm_exit_intr_error_code =
8778                         vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
8779         vmcs12->idt_vectoring_info_field = 0;
8780         vmcs12->vm_exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
8781         vmcs12->vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
8782
8783         if (!(vmcs12->vm_exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) {
8784                 /* vm_entry_intr_info_field is cleared on exit. Emulate this
8785                  * instead of reading the real value. */
8786                 vmcs12->vm_entry_intr_info_field &= ~INTR_INFO_VALID_MASK;
8787
8788                 /*
8789                  * Transfer the event that L0 or L1 may wanted to inject into
8790                  * L2 to IDT_VECTORING_INFO_FIELD.
8791                  */
8792                 vmcs12_save_pending_event(vcpu, vmcs12);
8793         }
8794
8795         /*
8796          * Drop what we picked up for L2 via vmx_complete_interrupts. It is
8797          * preserved above and would only end up incorrectly in L1.
8798          */
8799         vcpu->arch.nmi_injected = false;
8800         kvm_clear_exception_queue(vcpu);
8801         kvm_clear_interrupt_queue(vcpu);
8802 }
8803
8804 /*
8805  * A part of what we need to when the nested L2 guest exits and we want to
8806  * run its L1 parent, is to reset L1's guest state to the host state specified
8807  * in vmcs12.
8808  * This function is to be called not only on normal nested exit, but also on
8809  * a nested entry failure, as explained in Intel's spec, 3B.23.7 ("VM-Entry
8810  * Failures During or After Loading Guest State").
8811  * This function should be called when the active VMCS is L1's (vmcs01).
8812  */
8813 static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
8814                                    struct vmcs12 *vmcs12)
8815 {
8816         struct kvm_segment seg;
8817
8818         if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_EFER)
8819                 vcpu->arch.efer = vmcs12->host_ia32_efer;
8820         else if (vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE)
8821                 vcpu->arch.efer |= (EFER_LMA | EFER_LME);
8822         else
8823                 vcpu->arch.efer &= ~(EFER_LMA | EFER_LME);
8824         vmx_set_efer(vcpu, vcpu->arch.efer);
8825
8826         kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->host_rsp);
8827         kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->host_rip);
8828         vmx_set_rflags(vcpu, X86_EFLAGS_FIXED);
8829         /*
8830          * Note that calling vmx_set_cr0 is important, even if cr0 hasn't
8831          * actually changed, because it depends on the current state of
8832          * fpu_active (which may have changed).
8833          * Note that vmx_set_cr0 refers to efer set above.
8834          */
8835         vmx_set_cr0(vcpu, vmcs12->host_cr0);
8836         /*
8837          * If we did fpu_activate()/fpu_deactivate() during L2's run, we need
8838          * to apply the same changes to L1's vmcs. We just set cr0 correctly,
8839          * but we also need to update cr0_guest_host_mask and exception_bitmap.
8840          */
8841         update_exception_bitmap(vcpu);
8842         vcpu->arch.cr0_guest_owned_bits = (vcpu->fpu_active ? X86_CR0_TS : 0);
8843         vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
8844
8845         /*
8846          * Note that CR4_GUEST_HOST_MASK is already set in the original vmcs01
8847          * (KVM doesn't change it)- no reason to call set_cr4_guest_host_mask();
8848          */
8849         vcpu->arch.cr4_guest_owned_bits = ~vmcs_readl(CR4_GUEST_HOST_MASK);
8850         kvm_set_cr4(vcpu, vmcs12->host_cr4);
8851
8852         nested_ept_uninit_mmu_context(vcpu);
8853
8854         kvm_set_cr3(vcpu, vmcs12->host_cr3);
8855         kvm_mmu_reset_context(vcpu);
8856
8857         if (!enable_ept)
8858                 vcpu->arch.walk_mmu->inject_page_fault = kvm_inject_page_fault;
8859
8860         if (enable_vpid) {
8861                 /*
8862                  * Trivially support vpid by letting L2s share their parent
8863                  * L1's vpid. TODO: move to a more elaborate solution, giving
8864                  * each L2 its own vpid and exposing the vpid feature to L1.
8865                  */
8866                 vmx_flush_tlb(vcpu);
8867         }
8868
8869
8870         vmcs_write32(GUEST_SYSENTER_CS, vmcs12->host_ia32_sysenter_cs);
8871         vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->host_ia32_sysenter_esp);
8872         vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->host_ia32_sysenter_eip);
8873         vmcs_writel(GUEST_IDTR_BASE, vmcs12->host_idtr_base);
8874         vmcs_writel(GUEST_GDTR_BASE, vmcs12->host_gdtr_base);
8875
8876         /* If not VM_EXIT_CLEAR_BNDCFGS, the L2 value propagates to L1.  */
8877         if (vmcs12->vm_exit_controls & VM_EXIT_CLEAR_BNDCFGS)
8878                 vmcs_write64(GUEST_BNDCFGS, 0);
8879
8880         if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PAT) {
8881                 vmcs_write64(GUEST_IA32_PAT, vmcs12->host_ia32_pat);
8882                 vcpu->arch.pat = vmcs12->host_ia32_pat;
8883         }
8884         if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL)
8885                 vmcs_write64(GUEST_IA32_PERF_GLOBAL_CTRL,
8886                         vmcs12->host_ia32_perf_global_ctrl);
8887
8888         /* Set L1 segment info according to Intel SDM
8889             27.5.2 Loading Host Segment and Descriptor-Table Registers */
8890         seg = (struct kvm_segment) {
8891                 .base = 0,
8892                 .limit = 0xFFFFFFFF,
8893                 .selector = vmcs12->host_cs_selector,
8894                 .type = 11,
8895                 .present = 1,
8896                 .s = 1,
8897                 .g = 1
8898         };
8899         if (vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE)
8900                 seg.l = 1;
8901         else
8902                 seg.db = 1;
8903         vmx_set_segment(vcpu, &seg, VCPU_SREG_CS);
8904         seg = (struct kvm_segment) {
8905                 .base = 0,
8906                 .limit = 0xFFFFFFFF,
8907                 .type = 3,
8908                 .present = 1,
8909                 .s = 1,
8910                 .db = 1,
8911                 .g = 1
8912         };
8913         seg.selector = vmcs12->host_ds_selector;
8914         vmx_set_segment(vcpu, &seg, VCPU_SREG_DS);
8915         seg.selector = vmcs12->host_es_selector;
8916         vmx_set_segment(vcpu, &seg, VCPU_SREG_ES);
8917         seg.selector = vmcs12->host_ss_selector;
8918         vmx_set_segment(vcpu, &seg, VCPU_SREG_SS);
8919         seg.selector = vmcs12->host_fs_selector;
8920         seg.base = vmcs12->host_fs_base;
8921         vmx_set_segment(vcpu, &seg, VCPU_SREG_FS);
8922         seg.selector = vmcs12->host_gs_selector;
8923         seg.base = vmcs12->host_gs_base;
8924         vmx_set_segment(vcpu, &seg, VCPU_SREG_GS);
8925         seg = (struct kvm_segment) {
8926                 .base = vmcs12->host_tr_base,
8927                 .limit = 0x67,
8928                 .selector = vmcs12->host_tr_selector,
8929                 .type = 11,
8930                 .present = 1
8931         };
8932         vmx_set_segment(vcpu, &seg, VCPU_SREG_TR);
8933
8934         kvm_set_dr(vcpu, 7, 0x400);
8935         vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
8936 }
8937
8938 /*
8939  * Emulate an exit from nested guest (L2) to L1, i.e., prepare to run L1
8940  * and modify vmcs12 to make it see what it would expect to see there if
8941  * L2 was its real guest. Must only be called when in L2 (is_guest_mode())
8942  */
8943 static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
8944                               u32 exit_intr_info,
8945                               unsigned long exit_qualification)
8946 {
8947         struct vcpu_vmx *vmx = to_vmx(vcpu);
8948         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
8949
8950         /* trying to cancel vmlaunch/vmresume is a bug */
8951         WARN_ON_ONCE(vmx->nested.nested_run_pending);
8952
8953         leave_guest_mode(vcpu);
8954         prepare_vmcs12(vcpu, vmcs12, exit_reason, exit_intr_info,
8955                        exit_qualification);
8956
8957         vmx_load_vmcs01(vcpu);
8958
8959         if ((exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT)
8960             && nested_exit_intr_ack_set(vcpu)) {
8961                 int irq = kvm_cpu_get_interrupt(vcpu);
8962                 WARN_ON(irq < 0);
8963                 vmcs12->vm_exit_intr_info = irq |
8964                         INTR_INFO_VALID_MASK | INTR_TYPE_EXT_INTR;
8965         }
8966
8967         trace_kvm_nested_vmexit_inject(vmcs12->vm_exit_reason,
8968                                        vmcs12->exit_qualification,
8969                                        vmcs12->idt_vectoring_info_field,
8970                                        vmcs12->vm_exit_intr_info,
8971                                        vmcs12->vm_exit_intr_error_code,
8972                                        KVM_ISA_VMX);
8973
8974         vm_entry_controls_init(vmx, vmcs_read32(VM_ENTRY_CONTROLS));
8975         vm_exit_controls_init(vmx, vmcs_read32(VM_EXIT_CONTROLS));
8976         vmx_segment_cache_clear(vmx);
8977
8978         /* if no vmcs02 cache requested, remove the one we used */
8979         if (VMCS02_POOL_SIZE == 0)
8980                 nested_free_vmcs02(vmx, vmx->nested.current_vmptr);
8981
8982         load_vmcs12_host_state(vcpu, vmcs12);
8983
8984         /* Update TSC_OFFSET if TSC was changed while L2 ran */
8985         vmcs_write64(TSC_OFFSET, vmx->nested.vmcs01_tsc_offset);
8986
8987         /* This is needed for same reason as it was needed in prepare_vmcs02 */
8988         vmx->host_rsp = 0;
8989
8990         /* Unpin physical memory we referred to in vmcs02 */
8991         if (vmx->nested.apic_access_page) {
8992                 nested_release_page(vmx->nested.apic_access_page);
8993                 vmx->nested.apic_access_page = NULL;
8994         }
8995         if (vmx->nested.virtual_apic_page) {
8996                 nested_release_page(vmx->nested.virtual_apic_page);
8997                 vmx->nested.virtual_apic_page = NULL;
8998         }
8999
9000         /*
9001          * We are now running in L2, mmu_notifier will force to reload the
9002          * page's hpa for L2 vmcs. Need to reload it for L1 before entering L1.
9003          */
9004         kvm_vcpu_reload_apic_access_page(vcpu);
9005
9006         /*
9007          * Exiting from L2 to L1, we're now back to L1 which thinks it just
9008          * finished a VMLAUNCH or VMRESUME instruction, so we need to set the
9009          * success or failure flag accordingly.
9010          */
9011         if (unlikely(vmx->fail)) {
9012                 vmx->fail = 0;
9013                 nested_vmx_failValid(vcpu, vmcs_read32(VM_INSTRUCTION_ERROR));
9014         } else
9015                 nested_vmx_succeed(vcpu);
9016         if (enable_shadow_vmcs)
9017                 vmx->nested.sync_shadow_vmcs = true;
9018
9019         /* in case we halted in L2 */
9020         vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
9021 }
9022
9023 /*
9024  * Forcibly leave nested mode in order to be able to reset the VCPU later on.
9025  */
9026 static void vmx_leave_nested(struct kvm_vcpu *vcpu)
9027 {
9028         if (is_guest_mode(vcpu))
9029                 nested_vmx_vmexit(vcpu, -1, 0, 0);
9030         free_nested(to_vmx(vcpu));
9031 }
9032
9033 /*
9034  * L1's failure to enter L2 is a subset of a normal exit, as explained in
9035  * 23.7 "VM-entry failures during or after loading guest state" (this also
9036  * lists the acceptable exit-reason and exit-qualification parameters).
9037  * It should only be called before L2 actually succeeded to run, and when
9038  * vmcs01 is current (it doesn't leave_guest_mode() or switch vmcss).
9039  */
9040 static void nested_vmx_entry_failure(struct kvm_vcpu *vcpu,
9041                         struct vmcs12 *vmcs12,
9042                         u32 reason, unsigned long qualification)
9043 {
9044         load_vmcs12_host_state(vcpu, vmcs12);
9045         vmcs12->vm_exit_reason = reason | VMX_EXIT_REASONS_FAILED_VMENTRY;
9046         vmcs12->exit_qualification = qualification;
9047         nested_vmx_succeed(vcpu);
9048         if (enable_shadow_vmcs)
9049                 to_vmx(vcpu)->nested.sync_shadow_vmcs = true;
9050 }
9051
9052 static int vmx_check_intercept(struct kvm_vcpu *vcpu,
9053                                struct x86_instruction_info *info,
9054                                enum x86_intercept_stage stage)
9055 {
9056         return X86EMUL_CONTINUE;
9057 }
9058
9059 static void vmx_sched_in(struct kvm_vcpu *vcpu, int cpu)
9060 {
9061         if (ple_gap)
9062                 shrink_ple_window(vcpu);
9063 }
9064
9065 static struct kvm_x86_ops vmx_x86_ops = {
9066         .cpu_has_kvm_support = cpu_has_kvm_support,
9067         .disabled_by_bios = vmx_disabled_by_bios,
9068         .hardware_setup = hardware_setup,
9069         .hardware_unsetup = hardware_unsetup,
9070         .check_processor_compatibility = vmx_check_processor_compat,
9071         .hardware_enable = hardware_enable,
9072         .hardware_disable = hardware_disable,
9073         .cpu_has_accelerated_tpr = report_flexpriority,
9074
9075         .vcpu_create = vmx_create_vcpu,
9076         .vcpu_free = vmx_free_vcpu,
9077         .vcpu_reset = vmx_vcpu_reset,
9078
9079         .prepare_guest_switch = vmx_save_host_state,
9080         .vcpu_load = vmx_vcpu_load,
9081         .vcpu_put = vmx_vcpu_put,
9082
9083         .update_db_bp_intercept = update_exception_bitmap,
9084         .get_msr = vmx_get_msr,
9085         .set_msr = vmx_set_msr,
9086         .get_segment_base = vmx_get_segment_base,
9087         .get_segment = vmx_get_segment,
9088         .set_segment = vmx_set_segment,
9089         .get_cpl = vmx_get_cpl,
9090         .get_cs_db_l_bits = vmx_get_cs_db_l_bits,
9091         .decache_cr0_guest_bits = vmx_decache_cr0_guest_bits,
9092         .decache_cr3 = vmx_decache_cr3,
9093         .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
9094         .set_cr0 = vmx_set_cr0,
9095         .set_cr3 = vmx_set_cr3,
9096         .set_cr4 = vmx_set_cr4,
9097         .set_efer = vmx_set_efer,
9098         .get_idt = vmx_get_idt,
9099         .set_idt = vmx_set_idt,
9100         .get_gdt = vmx_get_gdt,
9101         .set_gdt = vmx_set_gdt,
9102         .get_dr6 = vmx_get_dr6,
9103         .set_dr6 = vmx_set_dr6,
9104         .set_dr7 = vmx_set_dr7,
9105         .sync_dirty_debug_regs = vmx_sync_dirty_debug_regs,
9106         .cache_reg = vmx_cache_reg,
9107         .get_rflags = vmx_get_rflags,
9108         .set_rflags = vmx_set_rflags,
9109         .fpu_deactivate = vmx_fpu_deactivate,
9110
9111         .tlb_flush = vmx_flush_tlb,
9112
9113         .run = vmx_vcpu_run,
9114         .handle_exit = vmx_handle_exit,
9115         .skip_emulated_instruction = skip_emulated_instruction,
9116         .set_interrupt_shadow = vmx_set_interrupt_shadow,
9117         .get_interrupt_shadow = vmx_get_interrupt_shadow,
9118         .patch_hypercall = vmx_patch_hypercall,
9119         .set_irq = vmx_inject_irq,
9120         .set_nmi = vmx_inject_nmi,
9121         .queue_exception = vmx_queue_exception,
9122         .cancel_injection = vmx_cancel_injection,
9123         .interrupt_allowed = vmx_interrupt_allowed,
9124         .nmi_allowed = vmx_nmi_allowed,
9125         .get_nmi_mask = vmx_get_nmi_mask,
9126         .set_nmi_mask = vmx_set_nmi_mask,
9127         .enable_nmi_window = enable_nmi_window,
9128         .enable_irq_window = enable_irq_window,
9129         .update_cr8_intercept = update_cr8_intercept,
9130         .set_virtual_x2apic_mode = vmx_set_virtual_x2apic_mode,
9131         .set_apic_access_page_addr = vmx_set_apic_access_page_addr,
9132         .vm_has_apicv = vmx_vm_has_apicv,
9133         .load_eoi_exitmap = vmx_load_eoi_exitmap,
9134         .hwapic_irr_update = vmx_hwapic_irr_update,
9135         .hwapic_isr_update = vmx_hwapic_isr_update,
9136         .sync_pir_to_irr = vmx_sync_pir_to_irr,
9137         .deliver_posted_interrupt = vmx_deliver_posted_interrupt,
9138
9139         .set_tss_addr = vmx_set_tss_addr,
9140         .get_tdp_level = get_ept_level,
9141         .get_mt_mask = vmx_get_mt_mask,
9142
9143         .get_exit_info = vmx_get_exit_info,
9144
9145         .get_lpage_level = vmx_get_lpage_level,
9146
9147         .cpuid_update = vmx_cpuid_update,
9148
9149         .rdtscp_supported = vmx_rdtscp_supported,
9150         .invpcid_supported = vmx_invpcid_supported,
9151
9152         .set_supported_cpuid = vmx_set_supported_cpuid,
9153
9154         .has_wbinvd_exit = cpu_has_vmx_wbinvd_exit,
9155
9156         .set_tsc_khz = vmx_set_tsc_khz,
9157         .read_tsc_offset = vmx_read_tsc_offset,
9158         .write_tsc_offset = vmx_write_tsc_offset,
9159         .adjust_tsc_offset = vmx_adjust_tsc_offset,
9160         .compute_tsc_offset = vmx_compute_tsc_offset,
9161         .read_l1_tsc = vmx_read_l1_tsc,
9162
9163         .set_tdp_cr3 = vmx_set_cr3,
9164
9165         .check_intercept = vmx_check_intercept,
9166         .handle_external_intr = vmx_handle_external_intr,
9167         .mpx_supported = vmx_mpx_supported,
9168
9169         .check_nested_events = vmx_check_nested_events,
9170
9171         .sched_in = vmx_sched_in,
9172 };
9173
9174 static int __init vmx_init(void)
9175 {
9176         int r, i, msr;
9177
9178         rdmsrl_safe(MSR_EFER, &host_efer);
9179
9180         for (i = 0; i < ARRAY_SIZE(vmx_msr_index); ++i)
9181                 kvm_define_shared_msr(i, vmx_msr_index[i]);
9182
9183         vmx_io_bitmap_a = (unsigned long *)__get_free_page(GFP_KERNEL);
9184         if (!vmx_io_bitmap_a)
9185                 return -ENOMEM;
9186
9187         r = -ENOMEM;
9188
9189         vmx_io_bitmap_b = (unsigned long *)__get_free_page(GFP_KERNEL);
9190         if (!vmx_io_bitmap_b)
9191                 goto out;
9192
9193         vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL);
9194         if (!vmx_msr_bitmap_legacy)
9195                 goto out1;
9196
9197         vmx_msr_bitmap_legacy_x2apic =
9198                                 (unsigned long *)__get_free_page(GFP_KERNEL);
9199         if (!vmx_msr_bitmap_legacy_x2apic)
9200                 goto out2;
9201
9202         vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL);
9203         if (!vmx_msr_bitmap_longmode)
9204                 goto out3;
9205
9206         vmx_msr_bitmap_longmode_x2apic =
9207                                 (unsigned long *)__get_free_page(GFP_KERNEL);
9208         if (!vmx_msr_bitmap_longmode_x2apic)
9209                 goto out4;
9210         vmx_vmread_bitmap = (unsigned long *)__get_free_page(GFP_KERNEL);
9211         if (!vmx_vmread_bitmap)
9212                 goto out5;
9213
9214         vmx_vmwrite_bitmap = (unsigned long *)__get_free_page(GFP_KERNEL);
9215         if (!vmx_vmwrite_bitmap)
9216                 goto out6;
9217
9218         memset(vmx_vmread_bitmap, 0xff, PAGE_SIZE);
9219         memset(vmx_vmwrite_bitmap, 0xff, PAGE_SIZE);
9220
9221         /*
9222          * Allow direct access to the PC debug port (it is often used for I/O
9223          * delays, but the vmexits simply slow things down).
9224          */
9225         memset(vmx_io_bitmap_a, 0xff, PAGE_SIZE);
9226         clear_bit(0x80, vmx_io_bitmap_a);
9227
9228         memset(vmx_io_bitmap_b, 0xff, PAGE_SIZE);
9229
9230         memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE);
9231         memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE);
9232
9233         set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */
9234
9235         r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx),
9236                      __alignof__(struct vcpu_vmx), THIS_MODULE);
9237         if (r)
9238                 goto out7;
9239
9240 #ifdef CONFIG_KEXEC
9241         rcu_assign_pointer(crash_vmclear_loaded_vmcss,
9242                            crash_vmclear_local_loaded_vmcss);
9243 #endif
9244
9245         vmx_disable_intercept_for_msr(MSR_FS_BASE, false);
9246         vmx_disable_intercept_for_msr(MSR_GS_BASE, false);
9247         vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true);
9248         vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false);
9249         vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false);
9250         vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
9251         vmx_disable_intercept_for_msr(MSR_IA32_BNDCFGS, true);
9252
9253         memcpy(vmx_msr_bitmap_legacy_x2apic,
9254                         vmx_msr_bitmap_legacy, PAGE_SIZE);
9255         memcpy(vmx_msr_bitmap_longmode_x2apic,
9256                         vmx_msr_bitmap_longmode, PAGE_SIZE);
9257
9258         if (enable_apicv) {
9259                 for (msr = 0x800; msr <= 0x8ff; msr++)
9260                         vmx_disable_intercept_msr_read_x2apic(msr);
9261
9262                 /* According SDM, in x2apic mode, the whole id reg is used.
9263                  * But in KVM, it only use the highest eight bits. Need to
9264                  * intercept it */
9265                 vmx_enable_intercept_msr_read_x2apic(0x802);
9266                 /* TMCCT */
9267                 vmx_enable_intercept_msr_read_x2apic(0x839);
9268                 /* TPR */
9269                 vmx_disable_intercept_msr_write_x2apic(0x808);
9270                 /* EOI */
9271                 vmx_disable_intercept_msr_write_x2apic(0x80b);
9272                 /* SELF-IPI */
9273                 vmx_disable_intercept_msr_write_x2apic(0x83f);
9274         }
9275
9276         if (enable_ept) {
9277                 kvm_mmu_set_mask_ptes(0ull,
9278                         (enable_ept_ad_bits) ? VMX_EPT_ACCESS_BIT : 0ull,
9279                         (enable_ept_ad_bits) ? VMX_EPT_DIRTY_BIT : 0ull,
9280                         0ull, VMX_EPT_EXECUTABLE_MASK);
9281                 ept_set_mmio_spte_mask();
9282                 kvm_enable_tdp();
9283         } else
9284                 kvm_disable_tdp();
9285
9286         update_ple_window_actual_max();
9287
9288         return 0;
9289
9290 out7:
9291         free_page((unsigned long)vmx_vmwrite_bitmap);
9292 out6:
9293         free_page((unsigned long)vmx_vmread_bitmap);
9294 out5:
9295         free_page((unsigned long)vmx_msr_bitmap_longmode_x2apic);
9296 out4:
9297         free_page((unsigned long)vmx_msr_bitmap_longmode);
9298 out3:
9299         free_page((unsigned long)vmx_msr_bitmap_legacy_x2apic);
9300 out2:
9301         free_page((unsigned long)vmx_msr_bitmap_legacy);
9302 out1:
9303         free_page((unsigned long)vmx_io_bitmap_b);
9304 out:
9305         free_page((unsigned long)vmx_io_bitmap_a);
9306         return r;
9307 }
9308
9309 static void __exit vmx_exit(void)
9310 {
9311         free_page((unsigned long)vmx_msr_bitmap_legacy_x2apic);
9312         free_page((unsigned long)vmx_msr_bitmap_longmode_x2apic);
9313         free_page((unsigned long)vmx_msr_bitmap_legacy);
9314         free_page((unsigned long)vmx_msr_bitmap_longmode);
9315         free_page((unsigned long)vmx_io_bitmap_b);
9316         free_page((unsigned long)vmx_io_bitmap_a);
9317         free_page((unsigned long)vmx_vmwrite_bitmap);
9318         free_page((unsigned long)vmx_vmread_bitmap);
9319
9320 #ifdef CONFIG_KEXEC
9321         RCU_INIT_POINTER(crash_vmclear_loaded_vmcss, NULL);
9322         synchronize_rcu();
9323 #endif
9324
9325         kvm_exit();
9326 }
9327
9328 module_init(vmx_init)
9329 module_exit(vmx_exit)