arch/x86/kvm/x86.c

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * derived from drivers/kvm/kvm_main.c
   5  *
   6  * Copyright (C) 2006 Qumranet, Inc.
   7  * Copyright (C) 2008 Qumranet, Inc.
   8  * Copyright IBM Corporation, 2008
   9  *
  10  * Authors:
  11  *   Avi Kivity   <avi@qumranet.com>
  12  *   Yaniv Kamay  <yaniv@qumranet.com>
  13  *   Amit Shah    <amit.shah@qumranet.com>
  14  *   Ben-Ami Yassour <benami@il.ibm.com>
  15  *
  16  * This work is licensed under the terms of the GNU GPL, version 2.  See
  17  * the COPYING file in the top-level directory.
  18  *
  19  */
  20
  21 #include <linux/kvm_host.h>
  22 #include "irq.h"
  23 #include "mmu.h"
  24 #include "i8254.h"
  25 #include "tss.h"
  26 #include "kvm_cache_regs.h"
  27 #include "x86.h"
  28
  29 #include <linux/clocksource.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/kvm.h>
  32 #include <linux/fs.h>
  33 #include <linux/vmalloc.h>
  34 #include <linux/module.h>
  35 #include <linux/mman.h>
  36 #include <linux/highmem.h>
  37 #include <linux/iommu.h>
  38 #include <linux/intel-iommu.h>
  39 #include <linux/cpufreq.h>
  40 #include <linux/user-return-notifier.h>
  41 #include <linux/srcu.h>
  42 #include <linux/slab.h>
  43 #include <linux/perf_event.h>
  44 #include <trace/events/kvm.h>
  45
  46 #define CREATE_TRACE_POINTS
  47 #include "trace.h"
  48
  49 #include <asm/debugreg.h>
  50 #include <asm/uaccess.h>
  51 #include <asm/msr.h>
  52 #include <asm/desc.h>
  53 #include <asm/mtrr.h>
  54 #include <asm/mce.h>
  55
  56 #define MAX_IO_MSRS 256
  57 #define CR0_RESERVED_BITS                                               \
  58         (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
  59                           | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
  60                           | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
  61 #define CR4_RESERVED_BITS                                               \
  62         (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
  63                           | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE     \
  64                           | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR  \
  65                           | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
  66
  67 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
  68
  69 #define KVM_MAX_MCE_BANKS 32
  70 #define KVM_MCE_CAP_SUPPORTED MCG_CTL_P
  71
  72 /* EFER defaults:
  73  * - enable syscall per default because its emulated by KVM
  74  * - enable LME and LMA per default on 64 bit KVM
  75  */
  76 #ifdef CONFIG_X86_64
  77 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffafeULL;
  78 #else
  79 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffffeULL;
  80 #endif
  81
  82 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
  83 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  84
  85 static void update_cr8_intercept(struct kvm_vcpu *vcpu);
  86 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
  87                                     struct kvm_cpuid_entry2 __user *entries);
  88
  89 struct kvm_x86_ops *kvm_x86_ops;
  90 EXPORT_SYMBOL_GPL(kvm_x86_ops);
  91
  92 int ignore_msrs = 0;
  93 module_param_named(ignore_msrs, ignore_msrs, bool, S_IRUGO | S_IWUSR);
  94
  95 #define KVM_NR_SHARED_MSRS 16
  96
  97 struct kvm_shared_msrs_global {
  98         int nr;
  99         u32 msrs[KVM_NR_SHARED_MSRS];
 100 };
 101
 102 struct kvm_shared_msrs {
 103         struct user_return_notifier urn;
 104         bool registered;
 105         struct kvm_shared_msr_values {
 106                 u64 host;
 107                 u64 curr;
 108         } values[KVM_NR_SHARED_MSRS];
 109 };
 110
 111 static struct kvm_shared_msrs_global __read_mostly shared_msrs_global;
 112 static DEFINE_PER_CPU(struct kvm_shared_msrs, shared_msrs);
 113
 114 struct kvm_stats_debugfs_item debugfs_entries[] = {
 115         { "pf_fixed", VCPU_STAT(pf_fixed) },
 116         { "pf_guest", VCPU_STAT(pf_guest) },
 117         { "tlb_flush", VCPU_STAT(tlb_flush) },
 118         { "invlpg", VCPU_STAT(invlpg) },
 119         { "exits", VCPU_STAT(exits) },
 120         { "io_exits", VCPU_STAT(io_exits) },
 121         { "mmio_exits", VCPU_STAT(mmio_exits) },
 122         { "signal_exits", VCPU_STAT(signal_exits) },
 123         { "irq_window", VCPU_STAT(irq_window_exits) },
 124         { "nmi_window", VCPU_STAT(nmi_window_exits) },
 125         { "halt_exits", VCPU_STAT(halt_exits) },
 126         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
 127         { "hypercalls", VCPU_STAT(hypercalls) },
 128         { "request_irq", VCPU_STAT(request_irq_exits) },
 129         { "irq_exits", VCPU_STAT(irq_exits) },
 130         { "host_state_reload", VCPU_STAT(host_state_reload) },
 131         { "efer_reload", VCPU_STAT(efer_reload) },
 132         { "fpu_reload", VCPU_STAT(fpu_reload) },
 133         { "insn_emulation", VCPU_STAT(insn_emulation) },
 134         { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
 135         { "irq_injections", VCPU_STAT(irq_injections) },
 136         { "nmi_injections", VCPU_STAT(nmi_injections) },
 137         { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
 138         { "mmu_pte_write", VM_STAT(mmu_pte_write) },
 139         { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
 140         { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
 141         { "mmu_flooded", VM_STAT(mmu_flooded) },
 142         { "mmu_recycled", VM_STAT(mmu_recycled) },
 143         { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
 144         { "mmu_unsync", VM_STAT(mmu_unsync) },
 145         { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
 146         { "largepages", VM_STAT(lpages) },
 147         { NULL }
 148 };
 149
 150 static void kvm_on_user_return(struct user_return_notifier *urn)
 151 {
 152         unsigned slot;
 153         struct kvm_shared_msrs *locals
 154                 = container_of(urn, struct kvm_shared_msrs, urn);
 155         struct kvm_shared_msr_values *values;
 156
 157         for (slot = 0; slot < shared_msrs_global.nr; ++slot) {
 158                 values = &locals->values[slot];
 159                 if (values->host != values->curr) {
 160                         wrmsrl(shared_msrs_global.msrs[slot], values->host);
 161                         values->curr = values->host;
 162                 }
 163         }
 164         locals->registered = false;
 165         user_return_notifier_unregister(urn);
 166 }
 167
 168 static void shared_msr_update(unsigned slot, u32 msr)
 169 {
 170         struct kvm_shared_msrs *smsr;
 171         u64 value;
 172
 173         smsr = &__get_cpu_var(shared_msrs);
 174         /* only read, and nobody should modify it at this time,
 175          * so don't need lock */
 176         if (slot >= shared_msrs_global.nr) {
 177                 printk(KERN_ERR "kvm: invalid MSR slot!");
 178                 return;
 179         }
 180         rdmsrl_safe(msr, &value);
 181         smsr->values[slot].host = value;
 182         smsr->values[slot].curr = value;
 183 }
 184
 185 void kvm_define_shared_msr(unsigned slot, u32 msr)
 186 {
 187         if (slot >= shared_msrs_global.nr)
 188                 shared_msrs_global.nr = slot + 1;
 189         shared_msrs_global.msrs[slot] = msr;
 190         /* we need ensured the shared_msr_global have been updated */
 191         smp_wmb();
 192 }
 193 EXPORT_SYMBOL_GPL(kvm_define_shared_msr);
 194
 195 static void kvm_shared_msr_cpu_online(void)
 196 {
 197         unsigned i;
 198
 199         for (i = 0; i < shared_msrs_global.nr; ++i)
 200                 shared_msr_update(i, shared_msrs_global.msrs[i]);
 201 }
 202
 203 void kvm_set_shared_msr(unsigned slot, u64 value, u64 mask)
 204 {
 205         struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
 206
 207         if (((value ^ smsr->values[slot].curr) & mask) == 0)
 208                 return;
 209         smsr->values[slot].curr = value;
 210         wrmsrl(shared_msrs_global.msrs[slot], value);
 211         if (!smsr->registered) {
 212                 smsr->urn.on_user_return = kvm_on_user_return;
 213                 user_return_notifier_register(&smsr->urn);
 214                 smsr->registered = true;
 215         }
 216 }
 217 EXPORT_SYMBOL_GPL(kvm_set_shared_msr);
 218
 219 static void drop_user_return_notifiers(void *ignore)
 220 {
 221         struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
 222
 223         if (smsr->registered)
 224                 kvm_on_user_return(&smsr->urn);
 225 }
 226
 227 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
 228 {
 229         if (irqchip_in_kernel(vcpu->kvm))
 230                 return vcpu->arch.apic_base;
 231         else
 232                 return vcpu->arch.apic_base;
 233 }
 234 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
 235
 236 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
 237 {
 238         /* TODO: reserve bits check */
 239         if (irqchip_in_kernel(vcpu->kvm))
 240                 kvm_lapic_set_base(vcpu, data);
 241         else
 242                 vcpu->arch.apic_base = data;
 243 }
 244 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
 245
 246 #define EXCPT_BENIGN            0
 247 #define EXCPT_CONTRIBUTORY      1
 248 #define EXCPT_PF                2
 249
 250 static int exception_class(int vector)
 251 {
 252         switch (vector) {
 253         case PF_VECTOR:
 254                 return EXCPT_PF;
 255         case DE_VECTOR:
 256         case TS_VECTOR:
 257         case NP_VECTOR:
 258         case SS_VECTOR:
 259         case GP_VECTOR:
 260                 return EXCPT_CONTRIBUTORY;
 261         default:
 262                 break;
 263         }
 264         return EXCPT_BENIGN;
 265 }
 266
 267 static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
 268                 unsigned nr, bool has_error, u32 error_code,
 269                 bool reinject)
 270 {
 271         u32 prev_nr;
 272         int class1, class2;
 273
 274         if (!vcpu->arch.exception.pending) {
 275         queue:
 276                 vcpu->arch.exception.pending = true;
 277                 vcpu->arch.exception.has_error_code = has_error;
 278                 vcpu->arch.exception.nr = nr;
 279                 vcpu->arch.exception.error_code = error_code;
 280                 vcpu->arch.exception.reinject = reinject;
 281                 return;
 282         }
 283
 284         /* to check exception */
 285         prev_nr = vcpu->arch.exception.nr;
 286         if (prev_nr == DF_VECTOR) {
 287                 /* triple fault -> shutdown */
 288                 set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
 289                 return;
 290         }
 291         class1 = exception_class(prev_nr);
 292         class2 = exception_class(nr);
 293         if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
 294                 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
 295                 /* generate double fault per SDM Table 5-5 */
 296                 vcpu->arch.exception.pending = true;
 297                 vcpu->arch.exception.has_error_code = true;
 298                 vcpu->arch.exception.nr = DF_VECTOR;
 299                 vcpu->arch.exception.error_code = 0;
 300         } else
 301                 /* replace previous exception with a new one in a hope
 302                    that instruction re-execution will regenerate lost
 303                    exception */
 304                 goto queue;
 305 }
 306
 307 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 308 {
 309         kvm_multiple_exception(vcpu, nr, false, 0, false);
 310 }
 311 EXPORT_SYMBOL_GPL(kvm_queue_exception);
 312
 313 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 314 {
 315         kvm_multiple_exception(vcpu, nr, false, 0, true);
 316 }
 317 EXPORT_SYMBOL_GPL(kvm_requeue_exception);
 318
 319 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr,
 320                            u32 error_code)
 321 {
 322         ++vcpu->stat.pf_guest;
 323         vcpu->arch.cr2 = addr;
 324         kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
 325 }
 326
 327 void kvm_inject_nmi(struct kvm_vcpu *vcpu)
 328 {
 329         vcpu->arch.nmi_pending = 1;
 330 }
 331 EXPORT_SYMBOL_GPL(kvm_inject_nmi);
 332
 333 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 334 {
 335         kvm_multiple_exception(vcpu, nr, true, error_code, false);
 336 }
 337 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
 338
 339 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 340 {
 341         kvm_multiple_exception(vcpu, nr, true, error_code, true);
 342 }
 343 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e);
 344
 345 /*
 346  * Checks if cpl <= required_cpl; if true, return true.  Otherwise queue
 347  * a #GP and return false.
 348  */
 349 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
 350 {
 351         if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl)
 352                 return true;
 353         kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
 354         return false;
 355 }
 356 EXPORT_SYMBOL_GPL(kvm_require_cpl);
 357
 358 /*
 359  * Load the pae pdptrs.  Return true is they are all valid.
 360  */
 361 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
 362 {
 363         gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
 364         unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
 365         int i;
 366         int ret;
 367         u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
 368
 369         ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
 370                                   offset * sizeof(u64), sizeof(pdpte));
 371         if (ret < 0) {
 372                 ret = 0;
 373                 goto out;
 374         }
 375         for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
 376                 if (is_present_gpte(pdpte[i]) &&
 377                     (pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) {
 378                         ret = 0;
 379                         goto out;
 380                 }
 381         }
 382         ret = 1;
 383
 384         memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs));
 385         __set_bit(VCPU_EXREG_PDPTR,
 386                   (unsigned long *)&vcpu->arch.regs_avail);
 387         __set_bit(VCPU_EXREG_PDPTR,
 388                   (unsigned long *)&vcpu->arch.regs_dirty);
 389 out:
 390
 391         return ret;
 392 }
 393 EXPORT_SYMBOL_GPL(load_pdptrs);
 394
 395 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
 396 {
 397         u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
 398         bool changed = true;
 399         int r;
 400
 401         if (is_long_mode(vcpu) || !is_pae(vcpu))
 402                 return false;
 403
 404         if (!test_bit(VCPU_EXREG_PDPTR,
 405                       (unsigned long *)&vcpu->arch.regs_avail))
 406                 return true;
 407
 408         r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte));
 409         if (r < 0)
 410                 goto out;
 411         changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0;
 412 out:
 413
 414         return changed;
 415 }
 416
 417 static int __kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 418 {
 419         cr0 |= X86_CR0_ET;
 420
 421 #ifdef CONFIG_X86_64
 422         if (cr0 & 0xffffffff00000000UL)
 423                 return 1;
 424 #endif
 425
 426         cr0 &= ~CR0_RESERVED_BITS;
 427
 428         if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD))
 429                 return 1;
 430
 431         if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE))
 432                 return 1;
 433
 434         if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
 435 #ifdef CONFIG_X86_64
 436                 if ((vcpu->arch.efer & EFER_LME)) {
 437                         int cs_db, cs_l;
 438
 439                         if (!is_pae(vcpu))
 440                                 return 1;
 441                         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
 442                         if (cs_l)
 443                                 return 1;
 444                 } else
 445 #endif
 446                 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.cr3))
 447                         return 1;
 448         }
 449
 450         kvm_x86_ops->set_cr0(vcpu, cr0);
 451
 452         kvm_mmu_reset_context(vcpu);
 453         return 0;
 454 }
 455
 456 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 457 {
 458         if (__kvm_set_cr0(vcpu, cr0))
 459                 kvm_inject_gp(vcpu, 0);
 460 }
 461 EXPORT_SYMBOL_GPL(kvm_set_cr0);
 462
 463 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 464 {
 465         kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
 466 }
 467 EXPORT_SYMBOL_GPL(kvm_lmsw);
 468
 469 int __kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 470 {
 471         unsigned long old_cr4 = kvm_read_cr4(vcpu);
 472         unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE;
 473
 474         if (cr4 & CR4_RESERVED_BITS)
 475                 return 1;
 476
 477         if (is_long_mode(vcpu)) {
 478                 if (!(cr4 & X86_CR4_PAE))
 479                         return 1;
 480         } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
 481                    && ((cr4 ^ old_cr4) & pdptr_bits)
 482                    && !load_pdptrs(vcpu, vcpu->arch.cr3))
 483                 return 1;
 484
 485         if (cr4 & X86_CR4_VMXE)
 486                 return 1;
 487
 488         kvm_x86_ops->set_cr4(vcpu, cr4);
 489         vcpu->arch.cr4 = cr4;
 490         kvm_mmu_reset_context(vcpu);
 491
 492         return 0;
 493 }
 494
 495 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 496 {
 497         if (__kvm_set_cr4(vcpu, cr4))
 498                 kvm_inject_gp(vcpu, 0);
 499 }
 500 EXPORT_SYMBOL_GPL(kvm_set_cr4);
 501
 502 static int __kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 503 {
 504         if (cr3 == vcpu->arch.cr3 && !pdptrs_changed(vcpu)) {
 505                 kvm_mmu_sync_roots(vcpu);
 506                 kvm_mmu_flush_tlb(vcpu);
 507                 return 0;
 508         }
 509
 510         if (is_long_mode(vcpu)) {
 511                 if (cr3 & CR3_L_MODE_RESERVED_BITS)
 512                         return 1;
 513         } else {
 514                 if (is_pae(vcpu)) {
 515                         if (cr3 & CR3_PAE_RESERVED_BITS)
 516                                 return 1;
 517                         if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3))
 518                                 return 1;
 519                 }
 520                 /*
 521                  * We don't check reserved bits in nonpae mode, because
 522                  * this isn't enforced, and VMware depends on this.
 523                  */
 524         }
 525
 526         /*
 527          * Does the new cr3 value map to physical memory? (Note, we
 528          * catch an invalid cr3 even in real-mode, because it would
 529          * cause trouble later on when we turn on paging anyway.)
 530          *
 531          * A real CPU would silently accept an invalid cr3 and would
 532          * attempt to use it - with largely undefined (and often hard
 533          * to debug) behavior on the guest side.
 534          */
 535         if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
 536                 return 1;
 537         vcpu->arch.cr3 = cr3;
 538         vcpu->arch.mmu.new_cr3(vcpu);
 539         return 0;
 540 }
 541
 542 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 543 {
 544         if (__kvm_set_cr3(vcpu, cr3))
 545                 kvm_inject_gp(vcpu, 0);
 546 }
 547 EXPORT_SYMBOL_GPL(kvm_set_cr3);
 548
 549 int __kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 550 {
 551         if (cr8 & CR8_RESERVED_BITS)
 552                 return 1;
 553         if (irqchip_in_kernel(vcpu->kvm))
 554                 kvm_lapic_set_tpr(vcpu, cr8);
 555         else
 556                 vcpu->arch.cr8 = cr8;
 557         return 0;
 558 }
 559
 560 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 561 {
 562         if (__kvm_set_cr8(vcpu, cr8))
 563                 kvm_inject_gp(vcpu, 0);
 564 }
 565 EXPORT_SYMBOL_GPL(kvm_set_cr8);
 566
 567 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
 568 {
 569         if (irqchip_in_kernel(vcpu->kvm))
 570                 return kvm_lapic_get_cr8(vcpu);
 571         else
 572                 return vcpu->arch.cr8;
 573 }
 574 EXPORT_SYMBOL_GPL(kvm_get_cr8);
 575
 576 static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
 577 {
 578         switch (dr) {
 579         case 0 ... 3:
 580                 vcpu->arch.db[dr] = val;
 581                 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
 582                         vcpu->arch.eff_db[dr] = val;
 583                 break;
 584         case 4:
 585                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 586                         return 1; /* #UD */
 587                 /* fall through */
 588         case 6:
 589                 if (val & 0xffffffff00000000ULL)
 590                         return -1; /* #GP */
 591                 vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
 592                 break;
 593         case 5:
 594                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 595                         return 1; /* #UD */
 596                 /* fall through */
 597         default: /* 7 */
 598                 if (val & 0xffffffff00000000ULL)
 599                         return -1; /* #GP */
 600                 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
 601                 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
 602                         kvm_x86_ops->set_dr7(vcpu, vcpu->arch.dr7);
 603                         vcpu->arch.switch_db_regs = (val & DR7_BP_EN_MASK);
 604                 }
 605                 break;
 606         }
 607
 608         return 0;
 609 }
 610
 611 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
 612 {
 613         int res;
 614
 615         res = __kvm_set_dr(vcpu, dr, val);
 616         if (res > 0)
 617                 kvm_queue_exception(vcpu, UD_VECTOR);
 618         else if (res < 0)
 619                 kvm_inject_gp(vcpu, 0);
 620
 621         return res;
 622 }
 623 EXPORT_SYMBOL_GPL(kvm_set_dr);
 624
 625 static int _kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
 626 {
 627         switch (dr) {
 628         case 0 ... 3:
 629                 *val = vcpu->arch.db[dr];
 630                 break;
 631         case 4:
 632                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 633                         return 1;
 634                 /* fall through */
 635         case 6:
 636                 *val = vcpu->arch.dr6;
 637                 break;
 638         case 5:
 639                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 640                         return 1;
 641                 /* fall through */
 642         default: /* 7 */
 643                 *val = vcpu->arch.dr7;
 644                 break;
 645         }
 646
 647         return 0;
 648 }
 649
 650 int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
 651 {
 652         if (_kvm_get_dr(vcpu, dr, val)) {
 653                 kvm_queue_exception(vcpu, UD_VECTOR);
 654                 return 1;
 655         }
 656         return 0;
 657 }
 658 EXPORT_SYMBOL_GPL(kvm_get_dr);
 659
 660 static inline u32 bit(int bitno)
 661 {
 662         return 1 << (bitno & 31);
 663 }
 664
 665 /*
 666  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
 667  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
 668  *
 669  * This list is modified at module load time to reflect the
 670  * capabilities of the host cpu. This capabilities test skips MSRs that are
 671  * kvm-specific. Those are put in the beginning of the list.
 672  */
 673
 674 #define KVM_SAVE_MSRS_BEGIN     7
 675 static u32 msrs_to_save[] = {
 676         MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
 677         MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
 678         HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
 679         HV_X64_MSR_APIC_ASSIST_PAGE,
 680         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
 681         MSR_K6_STAR,
 682 #ifdef CONFIG_X86_64
 683         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
 684 #endif
 685         MSR_IA32_TSC, MSR_IA32_PERF_STATUS, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA
 686 };
 687
 688 static unsigned num_msrs_to_save;
 689
 690 static u32 emulated_msrs[] = {
 691         MSR_IA32_MISC_ENABLE,
 692 };
 693
 694 static int set_efer(struct kvm_vcpu *vcpu, u64 efer)
 695 {
 696         if (efer & efer_reserved_bits)
 697                 return 1;
 698
 699         if (is_paging(vcpu)
 700             && (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME))
 701                 return 1;
 702
 703         if (efer & EFER_FFXSR) {
 704                 struct kvm_cpuid_entry2 *feat;
 705
 706                 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
 707                 if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT)))
 708                         return 1;
 709         }
 710
 711         if (efer & EFER_SVME) {
 712                 struct kvm_cpuid_entry2 *feat;
 713
 714                 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
 715                 if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM)))
 716                         return 1;
 717         }
 718
 719         efer &= ~EFER_LMA;
 720         efer |= vcpu->arch.efer & EFER_LMA;
 721
 722         kvm_x86_ops->set_efer(vcpu, efer);
 723
 724         vcpu->arch.efer = efer;
 725
 726         vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled;
 727         kvm_mmu_reset_context(vcpu);
 728
 729         return 0;
 730 }
 731
 732 void kvm_enable_efer_bits(u64 mask)
 733 {
 734        efer_reserved_bits &= ~mask;
 735 }
 736 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
 737
 738
 739 /*
 740  * Writes msr value into into the appropriate "register".
 741  * Returns 0 on success, non-0 otherwise.
 742  * Assumes vcpu_load() was already called.
 743  */
 744 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
 745 {
 746         return kvm_x86_ops->set_msr(vcpu, msr_index, data);
 747 }
 748
 749 /*
 750  * Adapt set_msr() to msr_io()'s calling convention
 751  */
 752 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
 753 {
 754         return kvm_set_msr(vcpu, index, *data);
 755 }
 756
 757 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
 758 {
 759         int version;
 760         int r;
 761         struct pvclock_wall_clock wc;
 762         struct timespec boot;
 763
 764         if (!wall_clock)
 765                 return;
 766
 767         r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version));
 768         if (r)
 769                 return;
 770
 771         if (version & 1)
 772                 ++version;  /* first time write, random junk */
 773
 774         ++version;
 775
 776         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 777
 778         /*
 779          * The guest calculates current wall clock time by adding
 780          * system time (updated by kvm_write_guest_time below) to the
 781          * wall clock specified here.  guest system time equals host
 782          * system time for us, thus we must fill in host boot time here.
 783          */
 784         getboottime(&boot);
 785
 786         wc.sec = boot.tv_sec;
 787         wc.nsec = boot.tv_nsec;
 788         wc.version = version;
 789
 790         kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
 791
 792         version++;
 793         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 794 }
 795
 796 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
 797 {
 798         uint32_t quotient, remainder;
 799
 800         /* Don't try to replace with do_div(), this one calculates
 801          * "(dividend << 32) / divisor" */
 802         __asm__ ( "divl %4"
 803                   : "=a" (quotient), "=d" (remainder)
 804                   : "0" (0), "1" (dividend), "r" (divisor) );
 805         return quotient;
 806 }
 807
 808 static void kvm_set_time_scale(uint32_t tsc_khz, struct pvclock_vcpu_time_info *hv_clock)
 809 {
 810         uint64_t nsecs = 1000000000LL;
 811         int32_t  shift = 0;
 812         uint64_t tps64;
 813         uint32_t tps32;
 814
 815         tps64 = tsc_khz * 1000LL;
 816         while (tps64 > nsecs*2) {
 817                 tps64 >>= 1;
 818                 shift--;
 819         }
 820
 821         tps32 = (uint32_t)tps64;
 822         while (tps32 <= (uint32_t)nsecs) {
 823                 tps32 <<= 1;
 824                 shift++;
 825         }
 826
 827         hv_clock->tsc_shift = shift;
 828         hv_clock->tsc_to_system_mul = div_frac(nsecs, tps32);
 829
 830         pr_debug("%s: tsc_khz %u, tsc_shift %d, tsc_mul %u\n",
 831                  __func__, tsc_khz, hv_clock->tsc_shift,
 832                  hv_clock->tsc_to_system_mul);
 833 }
 834
 835 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
 836
 837 static void kvm_write_guest_time(struct kvm_vcpu *v)
 838 {
 839         struct timespec ts;
 840         unsigned long flags;
 841         struct kvm_vcpu_arch *vcpu = &v->arch;
 842         void *shared_kaddr;
 843         unsigned long this_tsc_khz;
 844
 845         if ((!vcpu->time_page))
 846                 return;
 847
 848         this_tsc_khz = get_cpu_var(cpu_tsc_khz);
 849         if (unlikely(vcpu->hv_clock_tsc_khz != this_tsc_khz)) {
 850                 kvm_set_time_scale(this_tsc_khz, &vcpu->hv_clock);
 851                 vcpu->hv_clock_tsc_khz = this_tsc_khz;
 852         }
 853         put_cpu_var(cpu_tsc_khz);
 854
 855         /* Keep irq disabled to prevent changes to the clock */
 856         local_irq_save(flags);
 857         kvm_get_msr(v, MSR_IA32_TSC, &vcpu->hv_clock.tsc_timestamp);
 858         ktime_get_ts(&ts);
 859         monotonic_to_bootbased(&ts);
 860         local_irq_restore(flags);
 861
 862         /* With all the info we got, fill in the values */
 863
 864         vcpu->hv_clock.system_time = ts.tv_nsec +
 865                                      (NSEC_PER_SEC * (u64)ts.tv_sec) + v->kvm->arch.kvmclock_offset;
 866
 867         vcpu->hv_clock.flags = 0;
 868
 869         /*
 870          * The interface expects us to write an even number signaling that the
 871          * update is finished. Since the guest won't see the intermediate
 872          * state, we just increase by 2 at the end.
 873          */
 874         vcpu->hv_clock.version += 2;
 875
 876         shared_kaddr = kmap_atomic(vcpu->time_page, KM_USER0);
 877
 878         memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
 879                sizeof(vcpu->hv_clock));
 880
 881         kunmap_atomic(shared_kaddr, KM_USER0);
 882
 883         mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
 884 }
 885
 886 static int kvm_request_guest_time_update(struct kvm_vcpu *v)
 887 {
 888         struct kvm_vcpu_arch *vcpu = &v->arch;
 889
 890         if (!vcpu->time_page)
 891                 return 0;
 892         set_bit(KVM_REQ_KVMCLOCK_UPDATE, &v->requests);
 893         return 1;
 894 }
 895
 896 static bool msr_mtrr_valid(unsigned msr)
 897 {
 898         switch (msr) {
 899         case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
 900         case MSR_MTRRfix64K_00000:
 901         case MSR_MTRRfix16K_80000:
 902         case MSR_MTRRfix16K_A0000:
 903         case MSR_MTRRfix4K_C0000:
 904         case MSR_MTRRfix4K_C8000:
 905         case MSR_MTRRfix4K_D0000:
 906         case MSR_MTRRfix4K_D8000:
 907         case MSR_MTRRfix4K_E0000:
 908         case MSR_MTRRfix4K_E8000:
 909         case MSR_MTRRfix4K_F0000:
 910         case MSR_MTRRfix4K_F8000:
 911         case MSR_MTRRdefType:
 912         case MSR_IA32_CR_PAT:
 913                 return true;
 914         case 0x2f8:
 915                 return true;
 916         }
 917         return false;
 918 }
 919
 920 static bool valid_pat_type(unsigned t)
 921 {
 922         return t < 8 && (1 << t) & 0xf3; /* 0, 1, 4, 5, 6, 7 */
 923 }
 924
 925 static bool valid_mtrr_type(unsigned t)
 926 {
 927         return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */
 928 }
 929
 930 static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 931 {
 932         int i;
 933
 934         if (!msr_mtrr_valid(msr))
 935                 return false;
 936
 937         if (msr == MSR_IA32_CR_PAT) {
 938                 for (i = 0; i < 8; i++)
 939                         if (!valid_pat_type((data >> (i * 8)) & 0xff))
 940                                 return false;
 941                 return true;
 942         } else if (msr == MSR_MTRRdefType) {
 943                 if (data & ~0xcff)
 944                         return false;
 945                 return valid_mtrr_type(data & 0xff);
 946         } else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) {
 947                 for (i = 0; i < 8 ; i++)
 948                         if (!valid_mtrr_type((data >> (i * 8)) & 0xff))
 949                                 return false;
 950                 return true;
 951         }
 952
 953         /* variable MTRRs */
 954         return valid_mtrr_type(data & 0xff);
 955 }
 956
 957 static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 958 {
 959         u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
 960
 961         if (!mtrr_valid(vcpu, msr, data))
 962                 return 1;
 963
 964         if (msr == MSR_MTRRdefType) {
 965                 vcpu->arch.mtrr_state.def_type = data;
 966                 vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10;
 967         } else if (msr == MSR_MTRRfix64K_00000)
 968                 p[0] = data;
 969         else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
 970                 p[1 + msr - MSR_MTRRfix16K_80000] = data;
 971         else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
 972                 p[3 + msr - MSR_MTRRfix4K_C0000] = data;
 973         else if (msr == MSR_IA32_CR_PAT)
 974                 vcpu->arch.pat = data;
 975         else {  /* Variable MTRRs */
 976                 int idx, is_mtrr_mask;
 977                 u64 *pt;
 978
 979                 idx = (msr - 0x200) / 2;
 980                 is_mtrr_mask = msr - 0x200 - 2 * idx;
 981                 if (!is_mtrr_mask)
 982                         pt =
 983                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
 984                 else
 985                         pt =
 986                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
 987                 *pt = data;
 988         }
 989
 990         kvm_mmu_reset_context(vcpu);
 991         return 0;
 992 }
 993
 994 static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 995 {
 996         u64 mcg_cap = vcpu->arch.mcg_cap;
 997         unsigned bank_num = mcg_cap & 0xff;
 998
 999         switch (msr) {
1000         case MSR_IA32_MCG_STATUS:
1001                 vcpu->arch.mcg_status = data;
1002                 break;
1003         case MSR_IA32_MCG_CTL:
1004                 if (!(mcg_cap & MCG_CTL_P))
1005                         return 1;
1006                 if (data != 0 && data != ~(u64)0)
1007                         return -1;
1008                 vcpu->arch.mcg_ctl = data;
1009                 break;
1010         default:
1011                 if (msr >= MSR_IA32_MC0_CTL &&
1012                     msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1013                         u32 offset = msr - MSR_IA32_MC0_CTL;
1014                         /* only 0 or all 1s can be written to IA32_MCi_CTL
1015                          * some Linux kernels though clear bit 10 in bank 4 to
1016                          * workaround a BIOS/GART TBL issue on AMD K8s, ignore
1017                          * this to avoid an uncatched #GP in the guest
1018                          */
1019                         if ((offset & 0x3) == 0 &&
1020                             data != 0 && (data | (1 << 10)) != ~(u64)0)
1021                                 return -1;
1022                         vcpu->arch.mce_banks[offset] = data;
1023                         break;
1024                 }
1025                 return 1;
1026         }
1027         return 0;
1028 }
1029
1030 static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
1031 {
1032         struct kvm *kvm = vcpu->kvm;
1033         int lm = is_long_mode(vcpu);
1034         u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64
1035                 : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32;
1036         u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64
1037                 : kvm->arch.xen_hvm_config.blob_size_32;
1038         u32 page_num = data & ~PAGE_MASK;
1039         u64 page_addr = data & PAGE_MASK;
1040         u8 *page;
1041         int r;
1042
1043         r = -E2BIG;
1044         if (page_num >= blob_size)
1045                 goto out;
1046         r = -ENOMEM;
1047         page = kzalloc(PAGE_SIZE, GFP_KERNEL);
1048         if (!page)
1049                 goto out;
1050         r = -EFAULT;
1051         if (copy_from_user(page, blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE))
1052                 goto out_free;
1053         if (kvm_write_guest(kvm, page_addr, page, PAGE_SIZE))
1054                 goto out_free;
1055         r = 0;
1056 out_free:
1057         kfree(page);
1058 out:
1059         return r;
1060 }
1061
1062 static bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1063 {
1064         return kvm->arch.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE;
1065 }
1066
1067 static bool kvm_hv_msr_partition_wide(u32 msr)
1068 {
1069         bool r = false;
1070         switch (msr) {
1071         case HV_X64_MSR_GUEST_OS_ID:
1072         case HV_X64_MSR_HYPERCALL:
1073                 r = true;
1074                 break;
1075         }
1076
1077         return r;
1078 }
1079
1080 static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1081 {
1082         struct kvm *kvm = vcpu->kvm;
1083
1084         switch (msr) {
1085         case HV_X64_MSR_GUEST_OS_ID:
1086                 kvm->arch.hv_guest_os_id = data;
1087                 /* setting guest os id to zero disables hypercall page */
1088                 if (!kvm->arch.hv_guest_os_id)
1089                         kvm->arch.hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
1090                 break;
1091         case HV_X64_MSR_HYPERCALL: {
1092                 u64 gfn;
1093                 unsigned long addr;
1094                 u8 instructions[4];
1095
1096                 /* if guest os id is not set hypercall should remain disabled */
1097                 if (!kvm->arch.hv_guest_os_id)
1098                         break;
1099                 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
1100                         kvm->arch.hv_hypercall = data;
1101                         break;
1102                 }
1103                 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
1104                 addr = gfn_to_hva(kvm, gfn);
1105                 if (kvm_is_error_hva(addr))
1106                         return 1;
1107                 kvm_x86_ops->patch_hypercall(vcpu, instructions);
1108                 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
1109                 if (copy_to_user((void __user *)addr, instructions, 4))
1110                         return 1;
1111                 kvm->arch.hv_hypercall = data;
1112                 break;
1113         }
1114         default:
1115                 pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1116                           "data 0x%llx\n", msr, data);
1117                 return 1;
1118         }
1119         return 0;
1120 }
1121
1122 static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1123 {
1124         switch (msr) {
1125         case HV_X64_MSR_APIC_ASSIST_PAGE: {
1126                 unsigned long addr;
1127
1128                 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
1129                         vcpu->arch.hv_vapic = data;
1130                         break;
1131                 }
1132                 addr = gfn_to_hva(vcpu->kvm, data >>
1133                                   HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT);
1134                 if (kvm_is_error_hva(addr))
1135                         return 1;
1136                 if (clear_user((void __user *)addr, PAGE_SIZE))
1137                         return 1;
1138                 vcpu->arch.hv_vapic = data;
1139                 break;
1140         }
1141         case HV_X64_MSR_EOI:
1142                 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
1143         case HV_X64_MSR_ICR:
1144                 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
1145         case HV_X64_MSR_TPR:
1146                 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1147         default:
1148                 pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1149                           "data 0x%llx\n", msr, data);
1150                 return 1;
1151         }
1152
1153         return 0;
1154 }
1155
1156 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1157 {
1158         switch (msr) {
1159         case MSR_EFER:
1160                 return set_efer(vcpu, data);
1161         case MSR_K7_HWCR:
1162                 data &= ~(u64)0x40;     /* ignore flush filter disable */
1163                 data &= ~(u64)0x100;    /* ignore ignne emulation enable */
1164                 if (data != 0) {
1165                         pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
1166                                 data);
1167                         return 1;
1168                 }
1169                 break;
1170         case MSR_FAM10H_MMIO_CONF_BASE:
1171                 if (data != 0) {
1172                         pr_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
1173                                 "0x%llx\n", data);
1174                         return 1;
1175                 }
1176                 break;
1177         case MSR_AMD64_NB_CFG:
1178                 break;
1179         case MSR_IA32_DEBUGCTLMSR:
1180                 if (!data) {
1181                         /* We support the non-activated case already */
1182                         break;
1183                 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
1184                         /* Values other than LBR and BTF are vendor-specific,
1185                            thus reserved and should throw a #GP */
1186                         return 1;
1187                 }
1188                 pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
1189                         __func__, data);
1190                 break;
1191         case MSR_IA32_UCODE_REV:
1192         case MSR_IA32_UCODE_WRITE:
1193         case MSR_VM_HSAVE_PA:
1194         case MSR_AMD64_PATCH_LOADER:
1195                 break;
1196         case 0x200 ... 0x2ff:
1197                 return set_msr_mtrr(vcpu, msr, data);
1198         case MSR_IA32_APICBASE:
1199                 kvm_set_apic_base(vcpu, data);
1200                 break;
1201         case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1202                 return kvm_x2apic_msr_write(vcpu, msr, data);
1203         case MSR_IA32_MISC_ENABLE:
1204                 vcpu->arch.ia32_misc_enable_msr = data;
1205                 break;
1206         case MSR_KVM_WALL_CLOCK_NEW:
1207         case MSR_KVM_WALL_CLOCK:
1208                 vcpu->kvm->arch.wall_clock = data;
1209                 kvm_write_wall_clock(vcpu->kvm, data);
1210                 break;
1211         case MSR_KVM_SYSTEM_TIME_NEW:
1212         case MSR_KVM_SYSTEM_TIME: {
1213                 if (vcpu->arch.time_page) {
1214                         kvm_release_page_dirty(vcpu->arch.time_page);
1215                         vcpu->arch.time_page = NULL;
1216                 }
1217
1218                 vcpu->arch.time = data;
1219
1220                 /* we verify if the enable bit is set... */
1221                 if (!(data & 1))
1222                         break;
1223
1224                 /* ...but clean it before doing the actual write */
1225                 vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
1226
1227                 vcpu->arch.time_page =
1228                                 gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);
1229
1230                 if (is_error_page(vcpu->arch.time_page)) {
1231                         kvm_release_page_clean(vcpu->arch.time_page);
1232                         vcpu->arch.time_page = NULL;
1233                 }
1234
1235                 kvm_request_guest_time_update(vcpu);
1236                 break;
1237         }
1238         case MSR_IA32_MCG_CTL:
1239         case MSR_IA32_MCG_STATUS:
1240         case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1241                 return set_msr_mce(vcpu, msr, data);
1242
1243         /* Performance counters are not protected by a CPUID bit,
1244          * so we should check all of them in the generic path for the sake of
1245          * cross vendor migration.
1246          * Writing a zero into the event select MSRs disables them,
1247          * which we perfectly emulate ;-). Any other value should be at least
1248          * reported, some guests depend on them.
1249          */
1250         case MSR_P6_EVNTSEL0:
1251         case MSR_P6_EVNTSEL1:
1252         case MSR_K7_EVNTSEL0:
1253         case MSR_K7_EVNTSEL1:
1254         case MSR_K7_EVNTSEL2:
1255         case MSR_K7_EVNTSEL3:
1256                 if (data != 0)
1257                         pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
1258                                 "0x%x data 0x%llx\n", msr, data);
1259                 break;
1260         /* at least RHEL 4 unconditionally writes to the perfctr registers,
1261          * so we ignore writes to make it happy.
1262          */
1263         case MSR_P6_PERFCTR0:
1264         case MSR_P6_PERFCTR1:
1265         case MSR_K7_PERFCTR0:
1266         case MSR_K7_PERFCTR1:
1267         case MSR_K7_PERFCTR2:
1268         case MSR_K7_PERFCTR3:
1269                 pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
1270                         "0x%x data 0x%llx\n", msr, data);
1271                 break;
1272         case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
1273                 if (kvm_hv_msr_partition_wide(msr)) {
1274                         int r;
1275                         mutex_lock(&vcpu->kvm->lock);
1276                         r = set_msr_hyperv_pw(vcpu, msr, data);
1277                         mutex_unlock(&vcpu->kvm->lock);
1278                         return r;
1279                 } else
1280                         return set_msr_hyperv(vcpu, msr, data);
1281                 break;
1282         default:
1283                 if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr))
1284                         return xen_hvm_config(vcpu, data);
1285                 if (!ignore_msrs) {
1286                         pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n",
1287                                 msr, data);
1288                         return 1;
1289                 } else {
1290                         pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n",
1291                                 msr, data);
1292                         break;
1293                 }
1294         }
1295         return 0;
1296 }
1297 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1298
1299
1300 /*
1301  * Reads an msr value (of 'msr_index') into 'pdata'.
1302  * Returns 0 on success, non-0 otherwise.
1303  * Assumes vcpu_load() was already called.
1304  */
1305 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1306 {
1307         return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
1308 }
1309
1310 static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1311 {
1312         u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1313
1314         if (!msr_mtrr_valid(msr))
1315                 return 1;
1316
1317         if (msr == MSR_MTRRdefType)
1318                 *pdata = vcpu->arch.mtrr_state.def_type +
1319                          (vcpu->arch.mtrr_state.enabled << 10);
1320         else if (msr == MSR_MTRRfix64K_00000)
1321                 *pdata = p[0];
1322         else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1323                 *pdata = p[1 + msr - MSR_MTRRfix16K_80000];
1324         else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1325                 *pdata = p[3 + msr - MSR_MTRRfix4K_C0000];
1326         else if (msr == MSR_IA32_CR_PAT)
1327                 *pdata = vcpu->arch.pat;
1328         else {  /* Variable MTRRs */
1329                 int idx, is_mtrr_mask;
1330                 u64 *pt;
1331
1332                 idx = (msr - 0x200) / 2;
1333                 is_mtrr_mask = msr - 0x200 - 2 * idx;
1334                 if (!is_mtrr_mask)
1335                         pt =
1336                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1337                 else
1338                         pt =
1339                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1340                 *pdata = *pt;
1341         }
1342
1343         return 0;
1344 }
1345
1346 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1347 {
1348         u64 data;
1349         u64 mcg_cap = vcpu->arch.mcg_cap;
1350         unsigned bank_num = mcg_cap & 0xff;
1351
1352         switch (msr) {
1353         case MSR_IA32_P5_MC_ADDR:
1354         case MSR_IA32_P5_MC_TYPE:
1355                 data = 0;
1356                 break;
1357         case MSR_IA32_MCG_CAP:
1358                 data = vcpu->arch.mcg_cap;
1359                 break;
1360         case MSR_IA32_MCG_CTL:
1361                 if (!(mcg_cap & MCG_CTL_P))
1362                         return 1;
1363                 data = vcpu->arch.mcg_ctl;
1364                 break;
1365         case MSR_IA32_MCG_STATUS:
1366                 data = vcpu->arch.mcg_status;
1367                 break;
1368         default:
1369                 if (msr >= MSR_IA32_MC0_CTL &&
1370                     msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1371                         u32 offset = msr - MSR_IA32_MC0_CTL;
1372                         data = vcpu->arch.mce_banks[offset];
1373                         break;
1374                 }
1375                 return 1;
1376         }
1377         *pdata = data;
1378         return 0;
1379 }
1380
1381 static int get_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1382 {
1383         u64 data = 0;
1384         struct kvm *kvm = vcpu->kvm;
1385
1386         switch (msr) {
1387         case HV_X64_MSR_GUEST_OS_ID:
1388                 data = kvm->arch.hv_guest_os_id;
1389                 break;
1390         case HV_X64_MSR_HYPERCALL:
1391                 data = kvm->arch.hv_hypercall;
1392                 break;
1393         default:
1394                 pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1395                 return 1;
1396         }
1397
1398         *pdata = data;
1399         return 0;
1400 }
1401
1402 static int get_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1403 {
1404         u64 data = 0;
1405
1406         switch (msr) {
1407         case HV_X64_MSR_VP_INDEX: {
1408                 int r;
1409                 struct kvm_vcpu *v;
1410                 kvm_for_each_vcpu(r, v, vcpu->kvm)
1411                         if (v == vcpu)
1412                                 data = r;
1413                 break;
1414         }
1415         case HV_X64_MSR_EOI:
1416                 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
1417         case HV_X64_MSR_ICR:
1418                 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
1419         case HV_X64_MSR_TPR:
1420                 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
1421         default:
1422                 pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1423                 return 1;
1424         }
1425         *pdata = data;
1426         return 0;
1427 }
1428
1429 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1430 {
1431         u64 data;
1432
1433         switch (msr) {
1434         case MSR_IA32_PLATFORM_ID:
1435         case MSR_IA32_UCODE_REV:
1436         case MSR_IA32_EBL_CR_POWERON:
1437         case MSR_IA32_DEBUGCTLMSR:
1438         case MSR_IA32_LASTBRANCHFROMIP:
1439         case MSR_IA32_LASTBRANCHTOIP:
1440         case MSR_IA32_LASTINTFROMIP:
1441         case MSR_IA32_LASTINTTOIP:
1442         case MSR_K8_SYSCFG:
1443         case MSR_K7_HWCR:
1444         case MSR_VM_HSAVE_PA:
1445         case MSR_P6_PERFCTR0:
1446         case MSR_P6_PERFCTR1:
1447         case MSR_P6_EVNTSEL0:
1448         case MSR_P6_EVNTSEL1:
1449         case MSR_K7_EVNTSEL0:
1450         case MSR_K7_PERFCTR0:
1451         case MSR_K8_INT_PENDING_MSG:
1452         case MSR_AMD64_NB_CFG:
1453         case MSR_FAM10H_MMIO_CONF_BASE:
1454                 data = 0;
1455                 break;
1456         case MSR_MTRRcap:
1457                 data = 0x500 | KVM_NR_VAR_MTRR;
1458                 break;
1459         case 0x200 ... 0x2ff:
1460                 return get_msr_mtrr(vcpu, msr, pdata);
1461         case 0xcd: /* fsb frequency */
1462                 data = 3;
1463                 break;
1464         case MSR_IA32_APICBASE:
1465                 data = kvm_get_apic_base(vcpu);
1466                 break;
1467         case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1468                 return kvm_x2apic_msr_read(vcpu, msr, pdata);
1469                 break;
1470         case MSR_IA32_MISC_ENABLE:
1471                 data = vcpu->arch.ia32_misc_enable_msr;
1472                 break;
1473         case MSR_IA32_PERF_STATUS:
1474                 /* TSC increment by tick */
1475                 data = 1000ULL;
1476                 /* CPU multiplier */
1477                 data |= (((uint64_t)4ULL) << 40);
1478                 break;
1479         case MSR_EFER:
1480                 data = vcpu->arch.efer;
1481                 break;
1482         case MSR_KVM_WALL_CLOCK:
1483         case MSR_KVM_WALL_CLOCK_NEW:
1484                 data = vcpu->kvm->arch.wall_clock;
1485                 break;
1486         case MSR_KVM_SYSTEM_TIME:
1487         case MSR_KVM_SYSTEM_TIME_NEW:
1488                 data = vcpu->arch.time;
1489                 break;
1490         case MSR_IA32_P5_MC_ADDR:
1491         case MSR_IA32_P5_MC_TYPE:
1492         case MSR_IA32_MCG_CAP:
1493         case MSR_IA32_MCG_CTL:
1494         case MSR_IA32_MCG_STATUS:
1495         case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1496                 return get_msr_mce(vcpu, msr, pdata);
1497         case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
1498                 if (kvm_hv_msr_partition_wide(msr)) {
1499                         int r;
1500                         mutex_lock(&vcpu->kvm->lock);
1501                         r = get_msr_hyperv_pw(vcpu, msr, pdata);
1502                         mutex_unlock(&vcpu->kvm->lock);
1503                         return r;
1504                 } else
1505                         return get_msr_hyperv(vcpu, msr, pdata);
1506                 break;
1507         default:
1508                 if (!ignore_msrs) {
1509                         pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
1510                         return 1;
1511                 } else {
1512                         pr_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr);
1513                         data = 0;
1514                 }
1515                 break;
1516         }
1517         *pdata = data;
1518         return 0;
1519 }
1520 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1521
1522 /*
1523  * Read or write a bunch of msrs. All parameters are kernel addresses.
1524  *
1525  * @return number of msrs set successfully.
1526  */
1527 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
1528                     struct kvm_msr_entry *entries,
1529                     int (*do_msr)(struct kvm_vcpu *vcpu,
1530                                   unsigned index, u64 *data))
1531 {
1532         int i, idx;
1533
1534         vcpu_load(vcpu);
1535
1536         idx = srcu_read_lock(&vcpu->kvm->srcu);
1537         for (i = 0; i < msrs->nmsrs; ++i)
1538                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1539                         break;
1540         srcu_read_unlock(&vcpu->kvm->srcu, idx);
1541
1542         vcpu_put(vcpu);
1543
1544         return i;
1545 }
1546
1547 /*
1548  * Read or write a bunch of msrs. Parameters are user addresses.
1549  *
1550  * @return number of msrs set successfully.
1551  */
1552 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
1553                   int (*do_msr)(struct kvm_vcpu *vcpu,
1554                                 unsigned index, u64 *data),
1555                   int writeback)
1556 {
1557         struct kvm_msrs msrs;
1558         struct kvm_msr_entry *entries;
1559         int r, n;
1560         unsigned size;
1561
1562         r = -EFAULT;
1563         if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1564                 goto out;
1565
1566         r = -E2BIG;
1567         if (msrs.nmsrs >= MAX_IO_MSRS)
1568                 goto out;
1569
1570         r = -ENOMEM;
1571         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1572         entries = kmalloc(size, GFP_KERNEL);
1573         if (!entries)
1574                 goto out;
1575
1576         r = -EFAULT;
1577         if (copy_from_user(entries, user_msrs->entries, size))
1578                 goto out_free;
1579
1580         r = n = __msr_io(vcpu, &msrs, entries, do_msr);
1581         if (r < 0)
1582                 goto out_free;
1583
1584         r = -EFAULT;
1585         if (writeback && copy_to_user(user_msrs->entries, entries, size))
1586                 goto out_free;
1587
1588         r = n;
1589
1590 out_free:
1591         kfree(entries);
1592 out:
1593         return r;
1594 }
1595
1596 int kvm_dev_ioctl_check_extension(long ext)
1597 {
1598         int r;
1599
1600         switch (ext) {
1601         case KVM_CAP_IRQCHIP:
1602         case KVM_CAP_HLT:
1603         case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
1604         case KVM_CAP_SET_TSS_ADDR:
1605         case KVM_CAP_EXT_CPUID:
1606         case KVM_CAP_CLOCKSOURCE:
1607         case KVM_CAP_PIT:
1608         case KVM_CAP_NOP_IO_DELAY:
1609         case KVM_CAP_MP_STATE:
1610         case KVM_CAP_SYNC_MMU:
1611         case KVM_CAP_REINJECT_CONTROL:
1612         case KVM_CAP_IRQ_INJECT_STATUS:
1613         case KVM_CAP_ASSIGN_DEV_IRQ:
1614         case KVM_CAP_IRQFD:
1615         case KVM_CAP_IOEVENTFD:
1616         case KVM_CAP_PIT2:
1617         case KVM_CAP_PIT_STATE2:
1618         case KVM_CAP_SET_IDENTITY_MAP_ADDR:
1619         case KVM_CAP_XEN_HVM:
1620         case KVM_CAP_ADJUST_CLOCK:
1621         case KVM_CAP_VCPU_EVENTS:
1622         case KVM_CAP_HYPERV:
1623         case KVM_CAP_HYPERV_VAPIC:
1624         case KVM_CAP_HYPERV_SPIN:
1625         case KVM_CAP_PCI_SEGMENT:
1626         case KVM_CAP_DEBUGREGS:
1627         case KVM_CAP_X86_ROBUST_SINGLESTEP:
1628                 r = 1;
1629                 break;
1630         case KVM_CAP_COALESCED_MMIO:
1631                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
1632                 break;
1633         case KVM_CAP_VAPIC:
1634                 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
1635                 break;
1636         case KVM_CAP_NR_VCPUS:
1637                 r = KVM_MAX_VCPUS;
1638                 break;
1639         case KVM_CAP_NR_MEMSLOTS:
1640                 r = KVM_MEMORY_SLOTS;
1641                 break;
1642         case KVM_CAP_PV_MMU:    /* obsolete */
1643                 r = 0;
1644                 break;
1645         case KVM_CAP_IOMMU:
1646                 r = iommu_found();
1647                 break;
1648         case KVM_CAP_MCE:
1649                 r = KVM_MAX_MCE_BANKS;
1650                 break;
1651         default:
1652                 r = 0;
1653                 break;
1654         }
1655         return r;
1656
1657 }
1658
1659 long kvm_arch_dev_ioctl(struct file *filp,
1660                         unsigned int ioctl, unsigned long arg)
1661 {
1662         void __user *argp = (void __user *)arg;
1663         long r;
1664
1665         switch (ioctl) {
1666         case KVM_GET_MSR_INDEX_LIST: {
1667                 struct kvm_msr_list __user *user_msr_list = argp;
1668                 struct kvm_msr_list msr_list;
1669                 unsigned n;
1670
1671                 r = -EFAULT;
1672                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1673                         goto out;
1674                 n = msr_list.nmsrs;
1675                 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
1676                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1677                         goto out;
1678                 r = -E2BIG;
1679                 if (n < msr_list.nmsrs)
1680                         goto out;
1681                 r = -EFAULT;
1682                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
1683                                  num_msrs_to_save * sizeof(u32)))
1684                         goto out;
1685                 if (copy_to_user(user_msr_list->indices + num_msrs_to_save,
1686                                  &emulated_msrs,
1687                                  ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
1688                         goto out;
1689                 r = 0;
1690                 break;
1691         }
1692         case KVM_GET_SUPPORTED_CPUID: {
1693                 struct kvm_cpuid2 __user *cpuid_arg = argp;
1694                 struct kvm_cpuid2 cpuid;
1695
1696                 r = -EFAULT;
1697                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1698                         goto out;
1699                 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
1700                                                       cpuid_arg->entries);
1701                 if (r)
1702                         goto out;
1703
1704                 r = -EFAULT;
1705                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
1706                         goto out;
1707                 r = 0;
1708                 break;
1709         }
1710         case KVM_X86_GET_MCE_CAP_SUPPORTED: {
1711                 u64 mce_cap;
1712
1713                 mce_cap = KVM_MCE_CAP_SUPPORTED;
1714                 r = -EFAULT;
1715                 if (copy_to_user(argp, &mce_cap, sizeof mce_cap))
1716                         goto out;
1717                 r = 0;
1718                 break;
1719         }
1720         default:
1721                 r = -EINVAL;
1722         }
1723 out:
1724         return r;
1725 }
1726
1727 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
1728 {
1729         kvm_x86_ops->vcpu_load(vcpu, cpu);
1730         if (unlikely(per_cpu(cpu_tsc_khz, cpu) == 0)) {
1731                 unsigned long khz = cpufreq_quick_get(cpu);
1732                 if (!khz)
1733                         khz = tsc_khz;
1734                 per_cpu(cpu_tsc_khz, cpu) = khz;
1735         }
1736         kvm_request_guest_time_update(vcpu);
1737 }
1738
1739 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
1740 {
1741         kvm_x86_ops->vcpu_put(vcpu);
1742         kvm_put_guest_fpu(vcpu);
1743 }
1744
1745 static int is_efer_nx(void)
1746 {
1747         unsigned long long efer = 0;
1748
1749         rdmsrl_safe(MSR_EFER, &efer);
1750         return efer & EFER_NX;
1751 }
1752
1753 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
1754 {
1755         int i;
1756         struct kvm_cpuid_entry2 *e, *entry;
1757
1758         entry = NULL;
1759         for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
1760                 e = &vcpu->arch.cpuid_entries[i];
1761                 if (e->function == 0x80000001) {
1762                         entry = e;
1763                         break;
1764                 }
1765         }
1766         if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
1767                 entry->edx &= ~(1 << 20);
1768                 printk(KERN_INFO "kvm: guest NX capability removed\n");
1769         }
1770 }
1771
1772 /* when an old userspace process fills a new kernel module */
1773 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
1774                                     struct kvm_cpuid *cpuid,
1775                                     struct kvm_cpuid_entry __user *entries)
1776 {
1777         int r, i;
1778         struct kvm_cpuid_entry *cpuid_entries;
1779
1780         r = -E2BIG;
1781         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
1782                 goto out;
1783         r = -ENOMEM;
1784         cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
1785         if (!cpuid_entries)
1786                 goto out;
1787         r = -EFAULT;
1788         if (copy_from_user(cpuid_entries, entries,
1789                            cpuid->nent * sizeof(struct kvm_cpuid_entry)))
1790                 goto out_free;
1791         vcpu_load(vcpu);
1792         for (i = 0; i < cpuid->nent; i++) {
1793                 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
1794                 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
1795                 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
1796                 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
1797                 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
1798                 vcpu->arch.cpuid_entries[i].index = 0;
1799                 vcpu->arch.cpuid_entries[i].flags = 0;
1800                 vcpu->arch.cpuid_entries[i].padding[0] = 0;
1801                 vcpu->arch.cpuid_entries[i].padding[1] = 0;
1802                 vcpu->arch.cpuid_entries[i].padding[2] = 0;
1803         }
1804         vcpu->arch.cpuid_nent = cpuid->nent;
1805         cpuid_fix_nx_cap(vcpu);
1806         r = 0;
1807         kvm_apic_set_version(vcpu);
1808         kvm_x86_ops->cpuid_update(vcpu);
1809         vcpu_put(vcpu);
1810
1811 out_free:
1812         vfree(cpuid_entries);
1813 out:
1814         return r;
1815 }
1816
1817 static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
1818                                      struct kvm_cpuid2 *cpuid,
1819                                      struct kvm_cpuid_entry2 __user *entries)
1820 {
1821         int r;
1822
1823         r = -E2BIG;
1824         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
1825                 goto out;
1826         r = -EFAULT;
1827         if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
1828                            cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
1829                 goto out;
1830         vcpu_load(vcpu);
1831         vcpu->arch.cpuid_nent = cpuid->nent;
1832         kvm_apic_set_version(vcpu);
1833         kvm_x86_ops->cpuid_update(vcpu);
1834         vcpu_put(vcpu);
1835         return 0;
1836
1837 out:
1838         return r;
1839 }
1840
1841 static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
1842                                      struct kvm_cpuid2 *cpuid,
1843                                      struct kvm_cpuid_entry2 __user *entries)
1844 {
1845         int r;
1846
1847         vcpu_load(vcpu);
1848         r = -E2BIG;
1849         if (cpuid->nent < vcpu->arch.cpuid_nent)
1850                 goto out;
1851         r = -EFAULT;
1852         if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
1853                          vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
1854                 goto out;
1855         return 0;
1856
1857 out:
1858         cpuid->nent = vcpu->arch.cpuid_nent;
1859         vcpu_put(vcpu);
1860         return r;
1861 }
1862
1863 static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
1864                            u32 index)
1865 {
1866         entry->function = function;
1867         entry->index = index;
1868         cpuid_count(entry->function, entry->index,
1869                     &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
1870         entry->flags = 0;
1871 }
1872
1873 #define F(x) bit(X86_FEATURE_##x)
1874
1875 static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
1876                          u32 index, int *nent, int maxnent)
1877 {
1878         unsigned f_nx = is_efer_nx() ? F(NX) : 0;
1879 #ifdef CONFIG_X86_64
1880         unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL)
1881                                 ? F(GBPAGES) : 0;
1882         unsigned f_lm = F(LM);
1883 #else
1884         unsigned f_gbpages = 0;
1885         unsigned f_lm = 0;
1886 #endif
1887         unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0;
1888
1889         /* cpuid 1.edx */
1890         const u32 kvm_supported_word0_x86_features =
1891                 F(FPU) | F(VME) | F(DE) | F(PSE) |
1892                 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
1893                 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) |
1894                 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
1895                 F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLSH) |
1896                 0 /* Reserved, DS, ACPI */ | F(MMX) |
1897                 F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) |
1898                 0 /* HTT, TM, Reserved, PBE */;
1899         /* cpuid 0x80000001.edx */
1900         const u32 kvm_supported_word1_x86_features =
1901                 F(FPU) | F(VME) | F(DE) | F(PSE) |
1902                 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
1903                 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) |
1904                 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
1905                 F(PAT) | F(PSE36) | 0 /* Reserved */ |
1906                 f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) |
1907                 F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp |
1908                 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW);
1909         /* cpuid 1.ecx */
1910         const u32 kvm_supported_word4_x86_features =
1911                 F(XMM3) | 0 /* Reserved, DTES64, MONITOR */ |
1912                 0 /* DS-CPL, VMX, SMX, EST */ |
1913                 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ |
1914                 0 /* Reserved */ | F(CX16) | 0 /* xTPR Update, PDCM */ |
1915                 0 /* Reserved, DCA */ | F(XMM4_1) |
1916                 F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |
1917                 0 /* Reserved, XSAVE, OSXSAVE */;
1918         /* cpuid 0x80000001.ecx */
1919         const u32 kvm_supported_word6_x86_features =
1920                 F(LAHF_LM) | F(CMP_LEGACY) | F(SVM) | 0 /* ExtApicSpace */ |
1921                 F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) |
1922                 F(3DNOWPREFETCH) | 0 /* OSVW */ | 0 /* IBS */ | F(SSE5) |
1923                 0 /* SKINIT */ | 0 /* WDT */;
1924
1925         /* all calls to cpuid_count() should be made on the same cpu */
1926         get_cpu();
1927         do_cpuid_1_ent(entry, function, index);
1928         ++*nent;
1929
1930         switch (function) {
1931         case 0:
1932                 entry->eax = min(entry->eax, (u32)0xb);
1933                 break;
1934         case 1:
1935                 entry->edx &= kvm_supported_word0_x86_features;
1936                 entry->ecx &= kvm_supported_word4_x86_features;
1937                 /* we support x2apic emulation even if host does not support
1938                  * it since we emulate x2apic in software */
1939                 entry->ecx |= F(X2APIC);
1940                 break;
1941         /* function 2 entries are STATEFUL. That is, repeated cpuid commands
1942          * may return different values. This forces us to get_cpu() before
1943          * issuing the first command, and also to emulate this annoying behavior
1944          * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
1945         case 2: {
1946                 int t, times = entry->eax & 0xff;
1947
1948                 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1949                 entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
1950                 for (t = 1; t < times && *nent < maxnent; ++t) {
1951                         do_cpuid_1_ent(&entry[t], function, 0);
1952                         entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1953                         ++*nent;
1954                 }
1955                 break;
1956         }
1957         /* function 4 and 0xb have additional index. */
1958         case 4: {
1959                 int i, cache_type;
1960
1961                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1962                 /* read more entries until cache_type is zero */
1963                 for (i = 1; *nent < maxnent; ++i) {
1964                         cache_type = entry[i - 1].eax & 0x1f;
1965                         if (!cache_type)
1966                                 break;
1967                         do_cpuid_1_ent(&entry[i], function, i);
1968                         entry[i].flags |=
1969                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1970                         ++*nent;
1971                 }
1972                 break;
1973         }
1974         case 0xb: {
1975                 int i, level_type;
1976
1977                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1978                 /* read more entries until level_type is zero */
1979                 for (i = 1; *nent < maxnent; ++i) {
1980                         level_type = entry[i - 1].ecx & 0xff00;
1981                         if (!level_type)
1982                                 break;
1983                         do_cpuid_1_ent(&entry[i], function, i);
1984                         entry[i].flags |=
1985                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1986                         ++*nent;
1987                 }
1988                 break;
1989         }
1990         case KVM_CPUID_SIGNATURE: {
1991                 char signature[12] = "KVMKVMKVM\0\0";
1992                 u32 *sigptr = (u32 *)signature;
1993                 entry->eax = 0;
1994                 entry->ebx = sigptr[0];
1995                 entry->ecx = sigptr[1];
1996                 entry->edx = sigptr[2];
1997                 break;
1998         }
1999         case KVM_CPUID_FEATURES:
2000                 entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) |
2001                              (1 << KVM_FEATURE_NOP_IO_DELAY) |
2002                              (1 << KVM_FEATURE_CLOCKSOURCE2) |
2003                              (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT);
2004                 entry->ebx = 0;
2005                 entry->ecx = 0;
2006                 entry->edx = 0;
2007                 break;
2008         case 0x80000000:
2009                 entry->eax = min(entry->eax, 0x8000001a);
2010                 break;
2011         case 0x80000001:
2012                 entry->edx &= kvm_supported_word1_x86_features;
2013                 entry->ecx &= kvm_supported_word6_x86_features;
2014                 break;
2015         }
2016
2017         kvm_x86_ops->set_supported_cpuid(function, entry);
2018
2019         put_cpu();
2020 }
2021
2022 #undef F
2023
2024 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
2025                                      struct kvm_cpuid_entry2 __user *entries)
2026 {
2027         struct kvm_cpuid_entry2 *cpuid_entries;
2028         int limit, nent = 0, r = -E2BIG;
2029         u32 func;
2030
2031         if (cpuid->nent < 1)
2032                 goto out;
2033         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2034                 cpuid->nent = KVM_MAX_CPUID_ENTRIES;
2035         r = -ENOMEM;
2036         cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
2037         if (!cpuid_entries)
2038                 goto out;
2039
2040         do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
2041         limit = cpuid_entries[0].eax;
2042         for (func = 1; func <= limit && nent < cpuid->nent; ++func)
2043                 do_cpuid_ent(&cpuid_entries[nent], func, 0,
2044                              &nent, cpuid->nent);
2045         r = -E2BIG;
2046         if (nent >= cpuid->nent)
2047                 goto out_free;
2048
2049         do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
2050         limit = cpuid_entries[nent - 1].eax;
2051         for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
2052                 do_cpuid_ent(&cpuid_entries[nent], func, 0,
2053                              &nent, cpuid->nent);
2054
2055
2056
2057         r = -E2BIG;
2058         if (nent >= cpuid->nent)
2059                 goto out_free;
2060
2061         do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_SIGNATURE, 0, &nent,
2062                      cpuid->nent);
2063
2064         r = -E2BIG;
2065         if (nent >= cpuid->nent)
2066                 goto out_free;
2067
2068         do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_FEATURES, 0, &nent,
2069                      cpuid->nent);
2070
2071         r = -E2BIG;
2072         if (nent >= cpuid->nent)
2073                 goto out_free;
2074
2075         r = -EFAULT;
2076         if (copy_to_user(entries, cpuid_entries,
2077                          nent * sizeof(struct kvm_cpuid_entry2)))
2078                 goto out_free;
2079         cpuid->nent = nent;
2080         r = 0;
2081
2082 out_free:
2083         vfree(cpuid_entries);
2084 out:
2085         return r;
2086 }
2087
2088 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
2089                                     struct kvm_lapic_state *s)
2090 {
2091         vcpu_load(vcpu);
2092         memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
2093         vcpu_put(vcpu);
2094
2095         return 0;
2096 }
2097
2098 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
2099                                     struct kvm_lapic_state *s)
2100 {
2101         vcpu_load(vcpu);
2102         memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
2103         kvm_apic_post_state_restore(vcpu);
2104         update_cr8_intercept(vcpu);
2105         vcpu_put(vcpu);
2106
2107         return 0;
2108 }
2109
2110 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2111                                     struct kvm_interrupt *irq)
2112 {
2113         if (irq->irq < 0 || irq->irq >= 256)
2114                 return -EINVAL;
2115         if (irqchip_in_kernel(vcpu->kvm))
2116                 return -ENXIO;
2117         vcpu_load(vcpu);
2118
2119         kvm_queue_interrupt(vcpu, irq->irq, false);
2120
2121         vcpu_put(vcpu);
2122
2123         return 0;
2124 }
2125
2126 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
2127 {
2128         vcpu_load(vcpu);
2129         kvm_inject_nmi(vcpu);
2130         vcpu_put(vcpu);
2131
2132         return 0;
2133 }
2134
2135 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
2136                                            struct kvm_tpr_access_ctl *tac)
2137 {
2138         if (tac->flags)
2139                 return -EINVAL;
2140         vcpu->arch.tpr_access_reporting = !!tac->enabled;
2141         return 0;
2142 }
2143
2144 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
2145                                         u64 mcg_cap)
2146 {
2147         int r;
2148         unsigned bank_num = mcg_cap & 0xff, bank;
2149
2150         vcpu_load(vcpu);
2151         r = -EINVAL;
2152         if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
2153                 goto out;
2154         if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000))
2155                 goto out;
2156         r = 0;
2157         vcpu->arch.mcg_cap = mcg_cap;
2158         /* Init IA32_MCG_CTL to all 1s */
2159         if (mcg_cap & MCG_CTL_P)
2160                 vcpu->arch.mcg_ctl = ~(u64)0;
2161         /* Init IA32_MCi_CTL to all 1s */
2162         for (bank = 0; bank < bank_num; bank++)
2163                 vcpu->arch.mce_banks[bank*4] = ~(u64)0;
2164 out:
2165         vcpu_put(vcpu);
2166         return r;
2167 }
2168
2169 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
2170                                       struct kvm_x86_mce *mce)
2171 {
2172         u64 mcg_cap = vcpu->arch.mcg_cap;
2173         unsigned bank_num = mcg_cap & 0xff;
2174         u64 *banks = vcpu->arch.mce_banks;
2175
2176         if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
2177                 return -EINVAL;
2178         /*
2179          * if IA32_MCG_CTL is not all 1s, the uncorrected error
2180          * reporting is disabled
2181          */
2182         if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) &&
2183             vcpu->arch.mcg_ctl != ~(u64)0)
2184                 return 0;
2185         banks += 4 * mce->bank;
2186         /*
2187          * if IA32_MCi_CTL is not all 1s, the uncorrected error
2188          * reporting is disabled for the bank
2189          */
2190         if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0)
2191                 return 0;
2192         if (mce->status & MCI_STATUS_UC) {
2193                 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) ||
2194                     !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) {
2195                         printk(KERN_DEBUG "kvm: set_mce: "
2196                                "injects mce exception while "
2197                                "previous one is in progress!\n");
2198                         set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
2199                         return 0;
2200                 }
2201                 if (banks[1] & MCI_STATUS_VAL)
2202                         mce->status |= MCI_STATUS_OVER;
2203                 banks[2] = mce->addr;
2204                 banks[3] = mce->misc;
2205                 vcpu->arch.mcg_status = mce->mcg_status;
2206                 banks[1] = mce->status;
2207                 kvm_queue_exception(vcpu, MC_VECTOR);
2208         } else if (!(banks[1] & MCI_STATUS_VAL)
2209                    || !(banks[1] & MCI_STATUS_UC)) {
2210                 if (banks[1] & MCI_STATUS_VAL)
2211                         mce->status |= MCI_STATUS_OVER;
2212                 banks[2] = mce->addr;
2213                 banks[3] = mce->misc;
2214                 banks[1] = mce->status;
2215         } else
2216                 banks[1] |= MCI_STATUS_OVER;
2217         return 0;
2218 }
2219
2220 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
2221                                                struct kvm_vcpu_events *events)
2222 {
2223         vcpu_load(vcpu);
2224
2225         events->exception.injected =
2226                 vcpu->arch.exception.pending &&
2227                 !kvm_exception_is_soft(vcpu->arch.exception.nr);
2228         events->exception.nr = vcpu->arch.exception.nr;
2229         events->exception.has_error_code = vcpu->arch.exception.has_error_code;
2230         events->exception.error_code = vcpu->arch.exception.error_code;
2231
2232         events->interrupt.injected =
2233                 vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft;
2234         events->interrupt.nr = vcpu->arch.interrupt.nr;
2235         events->interrupt.soft = 0;
2236         events->interrupt.shadow =
2237                 kvm_x86_ops->get_interrupt_shadow(vcpu,
2238                         KVM_X86_SHADOW_INT_MOV_SS | KVM_X86_SHADOW_INT_STI);
2239
2240         events->nmi.injected = vcpu->arch.nmi_injected;
2241         events->nmi.pending = vcpu->arch.nmi_pending;
2242         events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu);
2243
2244         events->sipi_vector = vcpu->arch.sipi_vector;
2245
2246         events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
2247                          | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2248                          | KVM_VCPUEVENT_VALID_SHADOW);
2249
2250         vcpu_put(vcpu);
2251 }
2252
2253 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
2254                                               struct kvm_vcpu_events *events)
2255 {
2256         if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING
2257                               | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2258                               | KVM_VCPUEVENT_VALID_SHADOW))
2259                 return -EINVAL;
2260
2261         vcpu_load(vcpu);
2262
2263         vcpu->arch.exception.pending = events->exception.injected;
2264         vcpu->arch.exception.nr = events->exception.nr;
2265         vcpu->arch.exception.has_error_code = events->exception.has_error_code;
2266         vcpu->arch.exception.error_code = events->exception.error_code;
2267
2268         vcpu->arch.interrupt.pending = events->interrupt.injected;
2269         vcpu->arch.interrupt.nr = events->interrupt.nr;
2270         vcpu->arch.interrupt.soft = events->interrupt.soft;
2271         if (vcpu->arch.interrupt.pending && irqchip_in_kernel(vcpu->kvm))
2272                 kvm_pic_clear_isr_ack(vcpu->kvm);
2273         if (events->flags & KVM_VCPUEVENT_VALID_SHADOW)
2274                 kvm_x86_ops->set_interrupt_shadow(vcpu,
2275                                                   events->interrupt.shadow);
2276
2277         vcpu->arch.nmi_injected = events->nmi.injected;
2278         if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING)
2279                 vcpu->arch.nmi_pending = events->nmi.pending;
2280         kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked);
2281
2282         if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR)
2283                 vcpu->arch.sipi_vector = events->sipi_vector;
2284
2285         vcpu_put(vcpu);
2286
2287         return 0;
2288 }
2289
2290 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu,
2291                                              struct kvm_debugregs *dbgregs)
2292 {
2293         vcpu_load(vcpu);
2294
2295         memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db));
2296         dbgregs->dr6 = vcpu->arch.dr6;
2297         dbgregs->dr7 = vcpu->arch.dr7;
2298         dbgregs->flags = 0;
2299
2300         vcpu_put(vcpu);
2301 }
2302
2303 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
2304                                             struct kvm_debugregs *dbgregs)
2305 {
2306         if (dbgregs->flags)
2307                 return -EINVAL;
2308
2309         vcpu_load(vcpu);
2310
2311         memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
2312         vcpu->arch.dr6 = dbgregs->dr6;
2313         vcpu->arch.dr7 = dbgregs->dr7;
2314
2315         vcpu_put(vcpu);
2316
2317         return 0;
2318 }
2319
2320 long kvm_arch_vcpu_ioctl(struct file *filp,
2321                          unsigned int ioctl, unsigned long arg)
2322 {
2323         struct kvm_vcpu *vcpu = filp->private_data;
2324         void __user *argp = (void __user *)arg;
2325         int r;
2326         struct kvm_lapic_state *lapic = NULL;
2327
2328         switch (ioctl) {
2329         case KVM_GET_LAPIC: {
2330                 r = -EINVAL;
2331                 if (!vcpu->arch.apic)
2332                         goto out;
2333                 lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
2334
2335                 r = -ENOMEM;
2336                 if (!lapic)
2337                         goto out;
2338                 r = kvm_vcpu_ioctl_get_lapic(vcpu, lapic);
2339                 if (r)
2340                         goto out;
2341                 r = -EFAULT;
2342                 if (copy_to_user(argp, lapic, sizeof(struct kvm_lapic_state)))
2343                         goto out;
2344                 r = 0;
2345                 break;
2346         }
2347         case KVM_SET_LAPIC: {
2348                 r = -EINVAL;
2349                 if (!vcpu->arch.apic)
2350                         goto out;
2351                 lapic = kmalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
2352                 r = -ENOMEM;
2353                 if (!lapic)
2354                         goto out;
2355                 r = -EFAULT;
2356                 if (copy_from_user(lapic, argp, sizeof(struct kvm_lapic_state)))
2357                         goto out;
2358                 r = kvm_vcpu_ioctl_set_lapic(vcpu, lapic);
2359                 if (r)
2360                         goto out;
2361                 r = 0;
2362                 break;
2363         }
2364         case KVM_INTERRUPT: {
2365                 struct kvm_interrupt irq;
2366
2367                 r = -EFAULT;
2368                 if (copy_from_user(&irq, argp, sizeof irq))
2369                         goto out;
2370                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2371                 if (r)
2372                         goto out;
2373                 r = 0;
2374                 break;
2375         }
2376         case KVM_NMI: {
2377                 r = kvm_vcpu_ioctl_nmi(vcpu);
2378                 if (r)
2379                         goto out;
2380                 r = 0;
2381                 break;
2382         }
2383         case KVM_SET_CPUID: {
2384                 struct kvm_cpuid __user *cpuid_arg = argp;
2385                 struct kvm_cpuid cpuid;
2386
2387                 r = -EFAULT;
2388                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2389                         goto out;
2390                 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2391                 if (r)
2392                         goto out;
2393                 break;
2394         }
2395         case KVM_SET_CPUID2: {
2396                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2397                 struct kvm_cpuid2 cpuid;
2398
2399                 r = -EFAULT;
2400                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2401                         goto out;
2402                 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
2403                                               cpuid_arg->entries);
2404                 if (r)
2405                         goto out;
2406                 break;
2407         }
2408         case KVM_GET_CPUID2: {
2409                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2410                 struct kvm_cpuid2 cpuid;
2411
2412                 r = -EFAULT;
2413                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2414                         goto out;
2415                 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
2416                                               cpuid_arg->entries);
2417                 if (r)
2418                         goto out;
2419                 r = -EFAULT;
2420                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2421                         goto out;
2422                 r = 0;
2423                 break;
2424         }
2425         case KVM_GET_MSRS:
2426                 r = msr_io(vcpu, argp, kvm_get_msr, 1);
2427                 break;
2428         case KVM_SET_MSRS:
2429                 r = msr_io(vcpu, argp, do_set_msr, 0);
2430                 break;
2431         case KVM_TPR_ACCESS_REPORTING: {
2432                 struct kvm_tpr_access_ctl tac;
2433
2434                 r = -EFAULT;
2435                 if (copy_from_user(&tac, argp, sizeof tac))
2436                         goto out;
2437                 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
2438                 if (r)
2439                         goto out;
2440                 r = -EFAULT;
2441                 if (copy_to_user(argp, &tac, sizeof tac))
2442                         goto out;
2443                 r = 0;
2444                 break;
2445         };
2446         case KVM_SET_VAPIC_ADDR: {
2447                 struct kvm_vapic_addr va;
2448
2449                 r = -EINVAL;
2450                 if (!irqchip_in_kernel(vcpu->kvm))
2451                         goto out;
2452                 r = -EFAULT;
2453                 if (copy_from_user(&va, argp, sizeof va))
2454                         goto out;
2455                 r = 0;
2456                 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
2457                 break;
2458         }
2459         case KVM_X86_SETUP_MCE: {
2460                 u64 mcg_cap;
2461
2462                 r = -EFAULT;
2463                 if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap))
2464                         goto out;
2465                 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap);
2466                 break;
2467         }
2468         case KVM_X86_SET_MCE: {
2469                 struct kvm_x86_mce mce;
2470
2471                 r = -EFAULT;
2472                 if (copy_from_user(&mce, argp, sizeof mce))
2473                         goto out;
2474                 vcpu_load(vcpu);
2475                 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
2476                 vcpu_put(vcpu);
2477                 break;
2478         }
2479         case KVM_GET_VCPU_EVENTS: {
2480                 struct kvm_vcpu_events events;
2481
2482                 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events);
2483
2484                 r = -EFAULT;
2485                 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events)))
2486                         break;
2487                 r = 0;
2488                 break;
2489         }
2490         case KVM_SET_VCPU_EVENTS: {
2491                 struct kvm_vcpu_events events;
2492
2493                 r = -EFAULT;
2494                 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events)))
2495                         break;
2496
2497                 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events);
2498                 break;
2499         }
2500         case KVM_GET_DEBUGREGS: {
2501                 struct kvm_debugregs dbgregs;
2502
2503                 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs);
2504
2505                 r = -EFAULT;
2506                 if (copy_to_user(argp, &dbgregs,
2507                                  sizeof(struct kvm_debugregs)))
2508                         break;
2509                 r = 0;
2510                 break;
2511         }
2512         case KVM_SET_DEBUGREGS: {
2513                 struct kvm_debugregs dbgregs;
2514
2515                 r = -EFAULT;
2516                 if (copy_from_user(&dbgregs, argp,
2517                                    sizeof(struct kvm_debugregs)))
2518                         break;
2519
2520                 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs);
2521                 break;
2522         }
2523         default:
2524                 r = -EINVAL;
2525         }
2526 out:
2527         kfree(lapic);
2528         return r;
2529 }
2530
2531 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
2532 {
2533         int ret;
2534
2535         if (addr > (unsigned int)(-3 * PAGE_SIZE))
2536                 return -1;
2537         ret = kvm_x86_ops->set_tss_addr(kvm, addr);
2538         return ret;
2539 }
2540
2541 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm,
2542                                               u64 ident_addr)
2543 {
2544         kvm->arch.ept_identity_map_addr = ident_addr;
2545         return 0;
2546 }
2547
2548 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
2549                                           u32 kvm_nr_mmu_pages)
2550 {
2551         if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
2552                 return -EINVAL;
2553
2554         mutex_lock(&kvm->slots_lock);
2555         spin_lock(&kvm->mmu_lock);
2556
2557         kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
2558         kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
2559
2560         spin_unlock(&kvm->mmu_lock);
2561         mutex_unlock(&kvm->slots_lock);
2562         return 0;
2563 }
2564
2565 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
2566 {
2567         return kvm->arch.n_alloc_mmu_pages;
2568 }
2569
2570 gfn_t unalias_gfn_instantiation(struct kvm *kvm, gfn_t gfn)
2571 {
2572         int i;
2573         struct kvm_mem_alias *alias;
2574         struct kvm_mem_aliases *aliases;
2575
2576         aliases = kvm_aliases(kvm);
2577
2578         for (i = 0; i < aliases->naliases; ++i) {
2579                 alias = &aliases->aliases[i];
2580                 if (alias->flags & KVM_ALIAS_INVALID)
2581                         continue;
2582                 if (gfn >= alias->base_gfn
2583                     && gfn < alias->base_gfn + alias->npages)
2584                         return alias->target_gfn + gfn - alias->base_gfn;
2585         }
2586         return gfn;
2587 }
2588
2589 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
2590 {
2591         int i;
2592         struct kvm_mem_alias *alias;
2593         struct kvm_mem_aliases *aliases;
2594
2595         aliases = kvm_aliases(kvm);
2596
2597         for (i = 0; i < aliases->naliases; ++i) {
2598                 alias = &aliases->aliases[i];
2599                 if (gfn >= alias->base_gfn
2600                     && gfn < alias->base_gfn + alias->npages)
2601                         return alias->target_gfn + gfn - alias->base_gfn;
2602         }
2603         return gfn;
2604 }
2605
2606 /*
2607  * Set a new alias region.  Aliases map a portion of physical memory into
2608  * another portion.  This is useful for memory windows, for example the PC
2609  * VGA region.
2610  */
2611 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
2612                                          struct kvm_memory_alias *alias)
2613 {
2614         int r, n;
2615         struct kvm_mem_alias *p;
2616         struct kvm_mem_aliases *aliases, *old_aliases;
2617
2618         r = -EINVAL;
2619         /* General sanity checks */
2620         if (alias->memory_size & (PAGE_SIZE - 1))
2621                 goto out;
2622         if (alias->guest_phys_addr & (PAGE_SIZE - 1))
2623                 goto out;
2624         if (alias->slot >= KVM_ALIAS_SLOTS)
2625                 goto out;
2626         if (alias->guest_phys_addr + alias->memory_size
2627             < alias->guest_phys_addr)
2628                 goto out;
2629         if (alias->target_phys_addr + alias->memory_size
2630             < alias->target_phys_addr)
2631                 goto out;
2632
2633         r = -ENOMEM;
2634         aliases = kzalloc(sizeof(struct kvm_mem_aliases), GFP_KERNEL);
2635         if (!aliases)
2636                 goto out;
2637
2638         mutex_lock(&kvm->slots_lock);
2639
2640         /* invalidate any gfn reference in case of deletion/shrinking */
2641         memcpy(aliases, kvm->arch.aliases, sizeof(struct kvm_mem_aliases));
2642         aliases->aliases[alias->slot].flags |= KVM_ALIAS_INVALID;
2643         old_aliases = kvm->arch.aliases;
2644         rcu_assign_pointer(kvm->arch.aliases, aliases);
2645         synchronize_srcu_expedited(&kvm->srcu);
2646         kvm_mmu_zap_all(kvm);
2647         kfree(old_aliases);
2648
2649         r = -ENOMEM;
2650         aliases = kzalloc(sizeof(struct kvm_mem_aliases), GFP_KERNEL);
2651         if (!aliases)
2652                 goto out_unlock;
2653
2654         memcpy(aliases, kvm->arch.aliases, sizeof(struct kvm_mem_aliases));
2655
2656         p = &aliases->aliases[alias->slot];
2657         p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
2658         p->npages = alias->memory_size >> PAGE_SHIFT;
2659         p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
2660         p->flags &= ~(KVM_ALIAS_INVALID);
2661
2662         for (n = KVM_ALIAS_SLOTS; n > 0; --n)
2663                 if (aliases->aliases[n - 1].npages)
2664                         break;
2665         aliases->naliases = n;
2666
2667         old_aliases = kvm->arch.aliases;
2668         rcu_assign_pointer(kvm->arch.aliases, aliases);
2669         synchronize_srcu_expedited(&kvm->srcu);
2670         kfree(old_aliases);
2671         r = 0;
2672
2673 out_unlock:
2674         mutex_unlock(&kvm->slots_lock);
2675 out:
2676         return r;
2677 }
2678
2679 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
2680 {
2681         int r;
2682
2683         r = 0;
2684         switch (chip->chip_id) {
2685         case KVM_IRQCHIP_PIC_MASTER:
2686                 memcpy(&chip->chip.pic,
2687                         &pic_irqchip(kvm)->pics[0],
2688                         sizeof(struct kvm_pic_state));
2689                 break;
2690         case KVM_IRQCHIP_PIC_SLAVE:
2691                 memcpy(&chip->chip.pic,
2692                         &pic_irqchip(kvm)->pics[1],
2693                         sizeof(struct kvm_pic_state));
2694                 break;
2695         case KVM_IRQCHIP_IOAPIC:
2696                 r = kvm_get_ioapic(kvm, &chip->chip.ioapic);
2697                 break;
2698         default:
2699                 r = -EINVAL;
2700                 break;
2701         }
2702         return r;
2703 }
2704
2705 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
2706 {
2707         int r;
2708
2709         r = 0;
2710         switch (chip->chip_id) {
2711         case KVM_IRQCHIP_PIC_MASTER:
2712                 raw_spin_lock(&pic_irqchip(kvm)->lock);
2713                 memcpy(&pic_irqchip(kvm)->pics[0],
2714                         &chip->chip.pic,
2715                         sizeof(struct kvm_pic_state));
2716                 raw_spin_unlock(&pic_irqchip(kvm)->lock);
2717                 break;
2718         case KVM_IRQCHIP_PIC_SLAVE:
2719                 raw_spin_lock(&pic_irqchip(kvm)->lock);
2720                 memcpy(&pic_irqchip(kvm)->pics[1],
2721                         &chip->chip.pic,
2722                         sizeof(struct kvm_pic_state));
2723                 raw_spin_unlock(&pic_irqchip(kvm)->lock);
2724                 break;
2725         case KVM_IRQCHIP_IOAPIC:
2726                 r = kvm_set_ioapic(kvm, &chip->chip.ioapic);
2727                 break;
2728         default:
2729                 r = -EINVAL;
2730                 break;
2731         }
2732         kvm_pic_update_irq(pic_irqchip(kvm));
2733         return r;
2734 }
2735
2736 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
2737 {
2738         int r = 0;
2739
2740         mutex_lock(&kvm->arch.vpit->pit_state.lock);
2741         memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
2742         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2743         return r;
2744 }
2745
2746 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
2747 {
2748         int r = 0;
2749
2750         mutex_lock(&kvm->arch.vpit->pit_state.lock);
2751         memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
2752         kvm_pit_load_count(kvm, 0, ps->channels[0].count, 0);
2753         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2754         return r;
2755 }
2756
2757 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
2758 {
2759         int r = 0;
2760
2761         mutex_lock(&kvm->arch.vpit->pit_state.lock);
2762         memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
2763                 sizeof(ps->channels));
2764         ps->flags = kvm->arch.vpit->pit_state.flags;
2765         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2766         return r;
2767 }
2768
2769 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
2770 {
2771         int r = 0, start = 0;
2772         u32 prev_legacy, cur_legacy;
2773         mutex_lock(&kvm->arch.vpit->pit_state.lock);
2774         prev_legacy = kvm->arch.vpit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY;
2775         cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
2776         if (!prev_legacy && cur_legacy)
2777                 start = 1;
2778         memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels,
2779                sizeof(kvm->arch.vpit->pit_state.channels));
2780         kvm->arch.vpit->pit_state.flags = ps->flags;
2781         kvm_pit_load_count(kvm, 0, kvm->arch.vpit->pit_state.channels[0].count, start);
2782         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2783         return r;
2784 }
2785
2786 static int kvm_vm_ioctl_reinject(struct kvm *kvm,
2787                                  struct kvm_reinject_control *control)
2788 {
2789         if (!kvm->arch.vpit)
2790                 return -ENXIO;
2791         mutex_lock(&kvm->arch.vpit->pit_state.lock);
2792         kvm->arch.vpit->pit_state.pit_timer.reinject = control->pit_reinject;
2793         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2794         return 0;
2795 }
2796
2797 /*
2798  * Get (and clear) the dirty memory log for a memory slot.
2799  */
2800 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
2801                                       struct kvm_dirty_log *log)
2802 {
2803         int r, i;
2804         struct kvm_memory_slot *memslot;
2805         unsigned long n;
2806         unsigned long is_dirty = 0;
2807
2808         mutex_lock(&kvm->slots_lock);
2809
2810         r = -EINVAL;
2811         if (log->slot >= KVM_MEMORY_SLOTS)
2812                 goto out;
2813
2814         memslot = &kvm->memslots->memslots[log->slot];
2815         r = -ENOENT;
2816         if (!memslot->dirty_bitmap)
2817                 goto out;
2818
2819         n = kvm_dirty_bitmap_bytes(memslot);
2820
2821         for (i = 0; !is_dirty && i < n/sizeof(long); i++)
2822                 is_dirty = memslot->dirty_bitmap[i];
2823
2824         /* If nothing is dirty, don't bother messing with page tables. */
2825         if (is_dirty) {
2826                 struct kvm_memslots *slots, *old_slots;
2827                 unsigned long *dirty_bitmap;
2828
2829                 spin_lock(&kvm->mmu_lock);
2830                 kvm_mmu_slot_remove_write_access(kvm, log->slot);
2831                 spin_unlock(&kvm->mmu_lock);
2832
2833                 r = -ENOMEM;
2834                 dirty_bitmap = vmalloc(n);
2835                 if (!dirty_bitmap)
2836                         goto out;
2837                 memset(dirty_bitmap, 0, n);
2838
2839                 r = -ENOMEM;
2840                 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
2841                 if (!slots) {
2842                         vfree(dirty_bitmap);
2843                         goto out;
2844                 }
2845                 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
2846                 slots->memslots[log->slot].dirty_bitmap = dirty_bitmap;
2847
2848                 old_slots = kvm->memslots;
2849                 rcu_assign_pointer(kvm->memslots, slots);
2850                 synchronize_srcu_expedited(&kvm->srcu);
2851                 dirty_bitmap = old_slots->memslots[log->slot].dirty_bitmap;
2852                 kfree(old_slots);
2853
2854                 r = -EFAULT;
2855                 if (copy_to_user(log->dirty_bitmap, dirty_bitmap, n)) {
2856                         vfree(dirty_bitmap);
2857                         goto out;
2858                 }
2859                 vfree(dirty_bitmap);
2860         } else {
2861                 r = -EFAULT;
2862                 if (clear_user(log->dirty_bitmap, n))
2863                         goto out;
2864         }
2865
2866         r = 0;
2867 out:
2868         mutex_unlock(&kvm->slots_lock);
2869         return r;
2870 }
2871
2872 long kvm_arch_vm_ioctl(struct file *filp,
2873                        unsigned int ioctl, unsigned long arg)
2874 {
2875         struct kvm *kvm = filp->private_data;
2876         void __user *argp = (void __user *)arg;
2877         int r = -ENOTTY;
2878         /*
2879          * This union makes it completely explicit to gcc-3.x
2880          * that these two variables' stack usage should be
2881          * combined, not added together.
2882          */
2883         union {
2884                 struct kvm_pit_state ps;
2885                 struct kvm_pit_state2 ps2;
2886                 struct kvm_memory_alias alias;
2887                 struct kvm_pit_config pit_config;
2888         } u;
2889
2890         switch (ioctl) {
2891         case KVM_SET_TSS_ADDR:
2892                 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
2893                 if (r < 0)
2894                         goto out;
2895                 break;
2896         case KVM_SET_IDENTITY_MAP_ADDR: {
2897                 u64 ident_addr;
2898
2899                 r = -EFAULT;
2900                 if (copy_from_user(&ident_addr, argp, sizeof ident_addr))
2901                         goto out;
2902                 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
2903                 if (r < 0)
2904                         goto out;
2905                 break;
2906         }
2907         case KVM_SET_MEMORY_REGION: {
2908                 struct kvm_memory_region kvm_mem;
2909                 struct kvm_userspace_memory_region kvm_userspace_mem;
2910
2911                 r = -EFAULT;
2912                 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
2913                         goto out;
2914                 kvm_userspace_mem.slot = kvm_mem.slot;
2915                 kvm_userspace_mem.flags = kvm_mem.flags;
2916                 kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;
2917                 kvm_userspace_mem.memory_size = kvm_mem.memory_size;
2918                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);
2919                 if (r)
2920                         goto out;
2921                 break;
2922         }
2923         case KVM_SET_NR_MMU_PAGES:
2924                 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
2925                 if (r)
2926                         goto out;
2927                 break;
2928         case KVM_GET_NR_MMU_PAGES:
2929                 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
2930                 break;
2931         case KVM_SET_MEMORY_ALIAS:
2932                 r = -EFAULT;
2933                 if (copy_from_user(&u.alias, argp, sizeof(struct kvm_memory_alias)))
2934                         goto out;
2935                 r = kvm_vm_ioctl_set_memory_alias(kvm, &u.alias);
2936                 if (r)
2937                         goto out;
2938                 break;
2939         case KVM_CREATE_IRQCHIP: {
2940                 struct kvm_pic *vpic;
2941
2942                 mutex_lock(&kvm->lock);
2943                 r = -EEXIST;
2944                 if (kvm->arch.vpic)
2945                         goto create_irqchip_unlock;
2946                 r = -ENOMEM;
2947                 vpic = kvm_create_pic(kvm);
2948                 if (vpic) {
2949                         r = kvm_ioapic_init(kvm);
2950                         if (r) {
2951                                 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
2952                                                           &vpic->dev);
2953                                 kfree(vpic);
2954                                 goto create_irqchip_unlock;
2955                         }
2956                 } else
2957                         goto create_irqchip_unlock;
2958                 smp_wmb();
2959                 kvm->arch.vpic = vpic;
2960                 smp_wmb();
2961                 r = kvm_setup_default_irq_routing(kvm);
2962                 if (r) {
2963                         mutex_lock(&kvm->irq_lock);
2964                         kvm_ioapic_destroy(kvm);
2965                         kvm_destroy_pic(kvm);
2966                         mutex_unlock(&kvm->irq_lock);
2967                 }
2968         create_irqchip_unlock:
2969                 mutex_unlock(&kvm->lock);
2970                 break;
2971         }
2972         case KVM_CREATE_PIT:
2973                 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
2974                 goto create_pit;
2975         case KVM_CREATE_PIT2:
2976                 r = -EFAULT;
2977                 if (copy_from_user(&u.pit_config, argp,
2978                                    sizeof(struct kvm_pit_config)))
2979                         goto out;
2980         create_pit:
2981                 mutex_lock(&kvm->slots_lock);
2982                 r = -EEXIST;
2983                 if (kvm->arch.vpit)
2984                         goto create_pit_unlock;
2985                 r = -ENOMEM;
2986                 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
2987                 if (kvm->arch.vpit)
2988                         r = 0;
2989         create_pit_unlock:
2990                 mutex_unlock(&kvm->slots_lock);
2991                 break;
2992         case KVM_IRQ_LINE_STATUS:
2993         case KVM_IRQ_LINE: {
2994                 struct kvm_irq_level irq_event;
2995
2996                 r = -EFAULT;
2997                 if (copy_from_user(&irq_event, argp, sizeof irq_event))
2998                         goto out;
2999                 r = -ENXIO;
3000                 if (irqchip_in_kernel(kvm)) {
3001                         __s32 status;
3002                         status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
3003                                         irq_event.irq, irq_event.level);
3004                         if (ioctl == KVM_IRQ_LINE_STATUS) {
3005                                 r = -EFAULT;
3006                                 irq_event.status = status;
3007                                 if (copy_to_user(argp, &irq_event,
3008                                                         sizeof irq_event))
3009                                         goto out;
3010                         }
3011                         r = 0;
3012                 }
3013                 break;
3014         }
3015         case KVM_GET_IRQCHIP: {
3016                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3017                 struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
3018
3019                 r = -ENOMEM;
3020                 if (!chip)
3021                         goto out;
3022                 r = -EFAULT;
3023                 if (copy_from_user(chip, argp, sizeof *chip))
3024                         goto get_irqchip_out;
3025                 r = -ENXIO;
3026                 if (!irqchip_in_kernel(kvm))
3027                         goto get_irqchip_out;
3028                 r = kvm_vm_ioctl_get_irqchip(kvm, chip);
3029                 if (r)
3030                         goto get_irqchip_out;
3031                 r = -EFAULT;
3032                 if (copy_to_user(argp, chip, sizeof *chip))
3033                         goto get_irqchip_out;
3034                 r = 0;
3035         get_irqchip_out:
3036                 kfree(chip);
3037                 if (r)
3038                         goto out;
3039                 break;
3040         }
3041         case KVM_SET_IRQCHIP: {
3042                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3043                 struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
3044
3045                 r = -ENOMEM;
3046                 if (!chip)
3047                         goto out;
3048                 r = -EFAULT;
3049                 if (copy_from_user(chip, argp, sizeof *chip))
3050                         goto set_irqchip_out;
3051                 r = -ENXIO;
3052                 if (!irqchip_in_kernel(kvm))
3053                         goto set_irqchip_out;
3054                 r = kvm_vm_ioctl_set_irqchip(kvm, chip);
3055                 if (r)
3056                         goto set_irqchip_out;
3057                 r = 0;
3058         set_irqchip_out:
3059                 kfree(chip);
3060                 if (r)
3061                         goto out;
3062                 break;
3063         }
3064         case KVM_GET_PIT: {
3065                 r = -EFAULT;
3066                 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
3067                         goto out;
3068                 r = -ENXIO;
3069                 if (!kvm->arch.vpit)
3070                         goto out;
3071                 r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
3072                 if (r)
3073                         goto out;
3074                 r = -EFAULT;
3075                 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
3076                         goto out;
3077                 r = 0;
3078                 break;
3079         }
3080         case KVM_SET_PIT: {
3081                 r = -EFAULT;
3082                 if (copy_from_user(&u.ps, argp, sizeof u.ps))
3083                         goto out;
3084                 r = -ENXIO;
3085                 if (!kvm->arch.vpit)
3086                         goto out;
3087                 r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
3088                 if (r)
3089                         goto out;
3090                 r = 0;
3091                 break;
3092         }
3093         case KVM_GET_PIT2: {
3094                 r = -ENXIO;
3095                 if (!kvm->arch.vpit)
3096                         goto out;
3097                 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
3098                 if (r)
3099                         goto out;
3100                 r = -EFAULT;
3101                 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
3102                         goto out;
3103                 r = 0;
3104                 break;
3105         }
3106         case KVM_SET_PIT2: {
3107                 r = -EFAULT;
3108                 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2)))
3109                         goto out;
3110                 r = -ENXIO;
3111                 if (!kvm->arch.vpit)
3112                         goto out;
3113                 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
3114                 if (r)
3115                         goto out;
3116                 r = 0;
3117                 break;
3118         }
3119         case KVM_REINJECT_CONTROL: {
3120                 struct kvm_reinject_control control;
3121                 r =  -EFAULT;
3122                 if (copy_from_user(&control, argp, sizeof(control)))
3123                         goto out;
3124                 r = kvm_vm_ioctl_reinject(kvm, &control);
3125                 if (r)
3126                         goto out;
3127                 r = 0;
3128                 break;
3129         }
3130         case KVM_XEN_HVM_CONFIG: {
3131                 r = -EFAULT;
3132                 if (copy_from_user(&kvm->arch.xen_hvm_config, argp,
3133                                    sizeof(struct kvm_xen_hvm_config)))
3134                         goto out;
3135                 r = -EINVAL;
3136                 if (kvm->arch.xen_hvm_config.flags)
3137                         goto out;
3138                 r = 0;
3139                 break;
3140         }
3141         case KVM_SET_CLOCK: {
3142                 struct timespec now;
3143                 struct kvm_clock_data user_ns;
3144                 u64 now_ns;
3145                 s64 delta;
3146
3147                 r = -EFAULT;
3148                 if (copy_from_user(&user_ns, argp, sizeof(user_ns)))
3149                         goto out;
3150
3151                 r = -EINVAL;
3152                 if (user_ns.flags)
3153                         goto out;
3154
3155                 r = 0;
3156                 ktime_get_ts(&now);
3157                 now_ns = timespec_to_ns(&now);
3158                 delta = user_ns.clock - now_ns;
3159                 kvm->arch.kvmclock_offset = delta;
3160                 break;
3161         }
3162         case KVM_GET_CLOCK: {
3163                 struct timespec now;
3164                 struct kvm_clock_data user_ns;
3165                 u64 now_ns;
3166
3167                 ktime_get_ts(&now);
3168                 now_ns = timespec_to_ns(&now);
3169                 user_ns.clock = kvm->arch.kvmclock_offset + now_ns;
3170                 user_ns.flags = 0;
3171
3172                 r = -EFAULT;
3173                 if (copy_to_user(argp, &user_ns, sizeof(user_ns)))
3174                         goto out;
3175                 r = 0;
3176                 break;
3177         }
3178
3179         default:
3180                 ;
3181         }
3182 out:
3183         return r;
3184 }
3185
3186 static void kvm_init_msr_list(void)
3187 {
3188         u32 dummy[2];
3189         unsigned i, j;
3190
3191         /* skip the first msrs in the list. KVM-specific */
3192         for (i = j = KVM_SAVE_MSRS_BEGIN; i < ARRAY_SIZE(msrs_to_save); i++) {
3193                 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
3194                         continue;
3195                 if (j < i)
3196                         msrs_to_save[j] = msrs_to_save[i];
3197                 j++;
3198         }
3199         num_msrs_to_save = j;
3200 }
3201
3202 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
3203                            const void *v)
3204 {
3205         if (vcpu->arch.apic &&
3206             !kvm_iodevice_write(&vcpu->arch.apic->dev, addr, len, v))
3207                 return 0;
3208
3209         return kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, addr, len, v);
3210 }
3211
3212 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
3213 {
3214         if (vcpu->arch.apic &&
3215             !kvm_iodevice_read(&vcpu->arch.apic->dev, addr, len, v))
3216                 return 0;
3217
3218         return kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, addr, len, v);
3219 }
3220
3221 static void kvm_set_segment(struct kvm_vcpu *vcpu,
3222                         struct kvm_segment *var, int seg)
3223 {
3224         kvm_x86_ops->set_segment(vcpu, var, seg);
3225 }
3226
3227 void kvm_get_segment(struct kvm_vcpu *vcpu,
3228                      struct kvm_segment *var, int seg)
3229 {
3230         kvm_x86_ops->get_segment(vcpu, var, seg);
3231 }
3232
3233 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, u32 *error)
3234 {
3235         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3236         return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, access, error);
3237 }
3238
3239  gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, u32 *error)
3240 {
3241         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3242         access |= PFERR_FETCH_MASK;
3243         return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, access, error);
3244 }
3245
3246 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, u32 *error)
3247 {
3248         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3249         access |= PFERR_WRITE_MASK;
3250         return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, access, error);
3251 }
3252
3253 /* uses this to access any guest's mapped memory without checking CPL */
3254 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, u32 *error)
3255 {
3256         return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, 0, error);
3257 }
3258
3259 static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
3260                                       struct kvm_vcpu *vcpu, u32 access,
3261                                       u32 *error)
3262 {
3263         void *data = val;
3264         int r = X86EMUL_CONTINUE;
3265
3266         while (bytes) {
3267                 gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr, access, error);
3268                 unsigned offset = addr & (PAGE_SIZE-1);
3269                 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
3270                 int ret;
3271
3272                 if (gpa == UNMAPPED_GVA) {
3273                         r = X86EMUL_PROPAGATE_FAULT;
3274                         goto out;
3275                 }
3276                 ret = kvm_read_guest(vcpu->kvm, gpa, data, toread);
3277                 if (ret < 0) {
3278                         r = X86EMUL_IO_NEEDED;
3279                         goto out;
3280                 }
3281
3282                 bytes -= toread;
3283                 data += toread;
3284                 addr += toread;
3285         }
3286 out:
3287         return r;
3288 }
3289
3290 /* used for instruction fetching */
3291 static int kvm_fetch_guest_virt(gva_t addr, void *val, unsigned int bytes,
3292                                 struct kvm_vcpu *vcpu, u32 *error)
3293 {
3294         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3295         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu,
3296                                           access | PFERR_FETCH_MASK, error);
3297 }
3298
3299 static int kvm_read_guest_virt(gva_t addr, void *val, unsigned int bytes,
3300                                struct kvm_vcpu *vcpu, u32 *error)
3301 {
3302         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3303         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access,
3304                                           error);
3305 }
3306
3307 static int kvm_read_guest_virt_system(gva_t addr, void *val, unsigned int bytes,
3308                                struct kvm_vcpu *vcpu, u32 *error)
3309 {
3310         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, error);
3311 }
3312
3313 static int kvm_write_guest_virt_system(gva_t addr, void *val,
3314                                        unsigned int bytes,
3315                                        struct kvm_vcpu *vcpu,
3316                                        u32 *error)
3317 {
3318         void *data = val;
3319         int r = X86EMUL_CONTINUE;
3320
3321         while (bytes) {
3322                 gpa_t gpa =  vcpu->arch.mmu.gva_to_gpa(vcpu, addr,
3323                                                        PFERR_WRITE_MASK, error);
3324                 unsigned offset = addr & (PAGE_SIZE-1);
3325                 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
3326                 int ret;
3327
3328                 if (gpa == UNMAPPED_GVA) {
3329                         r = X86EMUL_PROPAGATE_FAULT;
3330                         goto out;
3331                 }
3332                 ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite);
3333                 if (ret < 0) {
3334                         r = X86EMUL_IO_NEEDED;
3335                         goto out;
3336                 }
3337
3338                 bytes -= towrite;
3339                 data += towrite;
3340                 addr += towrite;
3341         }
3342 out:
3343         return r;
3344 }
3345
3346 static int emulator_read_emulated(unsigned long addr,
3347                                   void *val,
3348                                   unsigned int bytes,
3349                                   unsigned int *error_code,
3350                                   struct kvm_vcpu *vcpu)
3351 {
3352         gpa_t                 gpa;
3353
3354         if (vcpu->mmio_read_completed) {
3355                 memcpy(val, vcpu->mmio_data, bytes);
3356                 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
3357                                vcpu->mmio_phys_addr, *(u64 *)val);
3358                 vcpu->mmio_read_completed = 0;
3359                 return X86EMUL_CONTINUE;
3360         }
3361
3362         gpa = kvm_mmu_gva_to_gpa_read(vcpu, addr, error_code);
3363
3364         if (gpa == UNMAPPED_GVA)
3365                 return X86EMUL_PROPAGATE_FAULT;
3366
3367         /* For APIC access vmexit */
3368         if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
3369                 goto mmio;
3370
3371         if (kvm_read_guest_virt(addr, val, bytes, vcpu, NULL)
3372                                 == X86EMUL_CONTINUE)
3373                 return X86EMUL_CONTINUE;
3374
3375 mmio:
3376         /*
3377          * Is this MMIO handled locally?
3378          */
3379         if (!vcpu_mmio_read(vcpu, gpa, bytes, val)) {
3380                 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes, gpa, *(u64 *)val);
3381                 return X86EMUL_CONTINUE;
3382         }
3383
3384         trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0);
3385
3386         vcpu->mmio_needed = 1;
3387         vcpu->run->exit_reason = KVM_EXIT_MMIO;
3388         vcpu->run->mmio.phys_addr = vcpu->mmio_phys_addr = gpa;
3389         vcpu->run->mmio.len = vcpu->mmio_size = bytes;
3390         vcpu->run->mmio.is_write = vcpu->mmio_is_write = 0;
3391
3392         return X86EMUL_IO_NEEDED;
3393 }
3394
3395 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
3396                           const void *val, int bytes)
3397 {
3398         int ret;
3399
3400         ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
3401         if (ret < 0)
3402                 return 0;
3403         kvm_mmu_pte_write(vcpu, gpa, val, bytes, 1);
3404         return 1;
3405 }
3406
3407 static int emulator_write_emulated_onepage(unsigned long addr,
3408                                            const void *val,
3409                                            unsigned int bytes,
3410                                            unsigned int *error_code,
3411                                            struct kvm_vcpu *vcpu)
3412 {
3413         gpa_t                 gpa;
3414
3415         gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, error_code);
3416
3417         if (gpa == UNMAPPED_GVA)
3418                 return X86EMUL_PROPAGATE_FAULT;
3419
3420         /* For APIC access vmexit */
3421         if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
3422                 goto mmio;
3423
3424         if (emulator_write_phys(vcpu, gpa, val, bytes))
3425                 return X86EMUL_CONTINUE;
3426
3427 mmio:
3428         trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val);
3429         /*
3430          * Is this MMIO handled locally?
3431          */
3432         if (!vcpu_mmio_write(vcpu, gpa, bytes, val))
3433                 return X86EMUL_CONTINUE;
3434
3435         vcpu->mmio_needed = 1;
3436         vcpu->run->exit_reason = KVM_EXIT_MMIO;
3437         vcpu->run->mmio.phys_addr = vcpu->mmio_phys_addr = gpa;
3438         vcpu->run->mmio.len = vcpu->mmio_size = bytes;
3439         vcpu->run->mmio.is_write = vcpu->mmio_is_write = 1;
3440         memcpy(vcpu->run->mmio.data, val, bytes);
3441
3442         return X86EMUL_CONTINUE;
3443 }
3444
3445 int emulator_write_emulated(unsigned long addr,
3446                             const void *val,
3447                             unsigned int bytes,
3448                             unsigned int *error_code,
3449                             struct kvm_vcpu *vcpu)
3450 {
3451         /* Crossing a page boundary? */
3452         if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
3453                 int rc, now;
3454
3455                 now = -addr & ~PAGE_MASK;
3456                 rc = emulator_write_emulated_onepage(addr, val, now, error_code,
3457                                                      vcpu);
3458                 if (rc != X86EMUL_CONTINUE)
3459                         return rc;
3460                 addr += now;
3461                 val += now;
3462                 bytes -= now;
3463         }
3464         return emulator_write_emulated_onepage(addr, val, bytes, error_code,
3465                                                vcpu);
3466 }
3467
3468 #define CMPXCHG_TYPE(t, ptr, old, new) \
3469         (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old))
3470
3471 #ifdef CONFIG_X86_64
3472 #  define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new)
3473 #else
3474 #  define CMPXCHG64(ptr, old, new) \
3475         (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old))
3476 #endif
3477
3478 static int emulator_cmpxchg_emulated(unsigned long addr,
3479                                      const void *old,
3480                                      const void *new,
3481                                      unsigned int bytes,
3482                                      unsigned int *error_code,
3483                                      struct kvm_vcpu *vcpu)
3484 {
3485         gpa_t gpa;
3486         struct page *page;
3487         char *kaddr;
3488         bool exchanged;
3489
3490         /* guests cmpxchg8b have to be emulated atomically */
3491         if (bytes > 8 || (bytes & (bytes - 1)))
3492                 goto emul_write;
3493
3494         gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL);
3495
3496         if (gpa == UNMAPPED_GVA ||
3497             (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
3498                 goto emul_write;
3499
3500         if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
3501                 goto emul_write;
3502
3503         page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
3504
3505         kaddr = kmap_atomic(page, KM_USER0);
3506         kaddr += offset_in_page(gpa);
3507         switch (bytes) {
3508         case 1:
3509                 exchanged = CMPXCHG_TYPE(u8, kaddr, old, new);
3510                 break;
3511         case 2:
3512                 exchanged = CMPXCHG_TYPE(u16, kaddr, old, new);
3513                 break;
3514         case 4:
3515                 exchanged = CMPXCHG_TYPE(u32, kaddr, old, new);
3516                 break;
3517         case 8:
3518                 exchanged = CMPXCHG64(kaddr, old, new);
3519                 break;
3520         default:
3521                 BUG();
3522         }
3523         kunmap_atomic(kaddr, KM_USER0);
3524         kvm_release_page_dirty(page);
3525
3526         if (!exchanged)
3527                 return X86EMUL_CMPXCHG_FAILED;
3528
3529         kvm_mmu_pte_write(vcpu, gpa, new, bytes, 1);
3530
3531         return X86EMUL_CONTINUE;
3532
3533 emul_write:
3534         printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
3535
3536         return emulator_write_emulated(addr, new, bytes, error_code, vcpu);
3537 }
3538
3539 static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
3540 {
3541         /* TODO: String I/O for in kernel device */
3542         int r;
3543
3544         if (vcpu->arch.pio.in)
3545                 r = kvm_io_bus_read(vcpu->kvm, KVM_PIO_BUS, vcpu->arch.pio.port,
3546                                     vcpu->arch.pio.size, pd);
3547         else
3548                 r = kvm_io_bus_write(vcpu->kvm, KVM_PIO_BUS,
3549                                      vcpu->arch.pio.port, vcpu->arch.pio.size,
3550                                      pd);
3551         return r;
3552 }
3553
3554
3555 static int emulator_pio_in_emulated(int size, unsigned short port, void *val,
3556                              unsigned int count, struct kvm_vcpu *vcpu)
3557 {
3558         if (vcpu->arch.pio.count)
3559                 goto data_avail;
3560
3561         trace_kvm_pio(1, port, size, 1);
3562
3563         vcpu->arch.pio.port = port;
3564         vcpu->arch.pio.in = 1;
3565         vcpu->arch.pio.count  = count;
3566         vcpu->arch.pio.size = size;
3567
3568         if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
3569         data_avail:
3570                 memcpy(val, vcpu->arch.pio_data, size * count);
3571                 vcpu->arch.pio.count = 0;
3572                 return 1;
3573         }
3574
3575         vcpu->run->exit_reason = KVM_EXIT_IO;
3576         vcpu->run->io.direction = KVM_EXIT_IO_IN;
3577         vcpu->run->io.size = size;
3578         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
3579         vcpu->run->io.count = count;
3580         vcpu->run->io.port = port;
3581
3582         return 0;
3583 }
3584
3585 static int emulator_pio_out_emulated(int size, unsigned short port,
3586                               const void *val, unsigned int count,
3587                               struct kvm_vcpu *vcpu)
3588 {
3589         trace_kvm_pio(0, port, size, 1);
3590
3591         vcpu->arch.pio.port = port;
3592         vcpu->arch.pio.in = 0;
3593         vcpu->arch.pio.count = count;
3594         vcpu->arch.pio.size = size;
3595
3596         memcpy(vcpu->arch.pio_data, val, size * count);
3597
3598         if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
3599                 vcpu->arch.pio.count = 0;
3600                 return 1;
3601         }
3602
3603         vcpu->run->exit_reason = KVM_EXIT_IO;
3604         vcpu->run->io.direction = KVM_EXIT_IO_OUT;
3605         vcpu->run->io.size = size;
3606         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
3607         vcpu->run->io.count = count;
3608         vcpu->run->io.port = port;
3609
3610         return 0;
3611 }
3612
3613 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
3614 {
3615         return kvm_x86_ops->get_segment_base(vcpu, seg);
3616 }
3617
3618 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
3619 {
3620         kvm_mmu_invlpg(vcpu, address);
3621         return X86EMUL_CONTINUE;
3622 }
3623
3624 int emulate_clts(struct kvm_vcpu *vcpu)
3625 {
3626         kvm_x86_ops->set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~X86_CR0_TS));
3627         kvm_x86_ops->fpu_activate(vcpu);
3628         return X86EMUL_CONTINUE;
3629 }
3630
3631 int emulator_get_dr(int dr, unsigned long *dest, struct kvm_vcpu *vcpu)
3632 {
3633         return _kvm_get_dr(vcpu, dr, dest);
3634 }
3635
3636 int emulator_set_dr(int dr, unsigned long value, struct kvm_vcpu *vcpu)
3637 {
3638
3639         return __kvm_set_dr(vcpu, dr, value);
3640 }
3641
3642 void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
3643 {
3644         u8 opcodes[4];
3645         unsigned long rip = kvm_rip_read(vcpu);
3646         unsigned long rip_linear;
3647
3648         if (!printk_ratelimit())
3649                 return;
3650
3651         rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
3652
3653         kvm_read_guest_virt(rip_linear, (void *)opcodes, 4, vcpu, NULL);
3654
3655         printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
3656                context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
3657 }
3658 EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
3659
3660 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
3661 {
3662         return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
3663 }
3664
3665 static unsigned long emulator_get_cr(int cr, struct kvm_vcpu *vcpu)
3666 {
3667         unsigned long value;
3668
3669         switch (cr) {
3670         case 0:
3671                 value = kvm_read_cr0(vcpu);
3672                 break;
3673         case 2:
3674                 value = vcpu->arch.cr2;
3675                 break;
3676         case 3:
3677                 value = vcpu->arch.cr3;
3678                 break;
3679         case 4:
3680                 value = kvm_read_cr4(vcpu);
3681                 break;
3682         case 8:
3683                 value = kvm_get_cr8(vcpu);
3684                 break;
3685         default:
3686                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
3687                 return 0;
3688         }
3689
3690         return value;
3691 }
3692
3693 static int emulator_set_cr(int cr, unsigned long val, struct kvm_vcpu *vcpu)
3694 {
3695         int res = 0;
3696
3697         switch (cr) {
3698         case 0:
3699                 res = __kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val));
3700                 break;
3701         case 2:
3702                 vcpu->arch.cr2 = val;
3703                 break;
3704         case 3:
3705                 res = __kvm_set_cr3(vcpu, val);
3706                 break;
3707         case 4:
3708                 res = __kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val));
3709                 break;
3710         case 8:
3711                 res = __kvm_set_cr8(vcpu, val & 0xfUL);
3712                 break;
3713         default:
3714                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
3715                 res = -1;
3716         }
3717
3718         return res;
3719 }
3720
3721 static int emulator_get_cpl(struct kvm_vcpu *vcpu)
3722 {
3723         return kvm_x86_ops->get_cpl(vcpu);
3724 }
3725
3726 static void emulator_get_gdt(struct desc_ptr *dt, struct kvm_vcpu *vcpu)
3727 {
3728         kvm_x86_ops->get_gdt(vcpu, dt);
3729 }
3730
3731 static unsigned long emulator_get_cached_segment_base(int seg,
3732                                                       struct kvm_vcpu *vcpu)
3733 {
3734         return get_segment_base(vcpu, seg);
3735 }
3736
3737 static bool emulator_get_cached_descriptor(struct desc_struct *desc, int seg,
3738                                            struct kvm_vcpu *vcpu)
3739 {
3740         struct kvm_segment var;
3741
3742         kvm_get_segment(vcpu, &var, seg);
3743
3744         if (var.unusable)
3745                 return false;
3746
3747         if (var.g)
3748                 var.limit >>= 12;
3749         set_desc_limit(desc, var.limit);
3750         set_desc_base(desc, (unsigned long)var.base);
3751         desc->type = var.type;
3752         desc->s = var.s;
3753         desc->dpl = var.dpl;
3754         desc->p = var.present;
3755         desc->avl = var.avl;
3756         desc->l = var.l;
3757         desc->d = var.db;
3758         desc->g = var.g;
3759
3760         return true;
3761 }
3762
3763 static void emulator_set_cached_descriptor(struct desc_struct *desc, int seg,
3764                                            struct kvm_vcpu *vcpu)
3765 {
3766         struct kvm_segment var;
3767
3768         /* needed to preserve selector */
3769         kvm_get_segment(vcpu, &var, seg);
3770
3771         var.base = get_desc_base(desc);
3772         var.limit = get_desc_limit(desc);
3773         if (desc->g)
3774                 var.limit = (var.limit << 12) | 0xfff;
3775         var.type = desc->type;
3776         var.present = desc->p;
3777         var.dpl = desc->dpl;
3778         var.db = desc->d;
3779         var.s = desc->s;
3780         var.l = desc->l;
3781         var.g = desc->g;
3782         var.avl = desc->avl;
3783         var.present = desc->p;
3784         var.unusable = !var.present;
3785         var.padding = 0;
3786
3787         kvm_set_segment(vcpu, &var, seg);
3788         return;
3789 }
3790
3791 static u16 emulator_get_segment_selector(int seg, struct kvm_vcpu *vcpu)
3792 {
3793         struct kvm_segment kvm_seg;
3794
3795         kvm_get_segment(vcpu, &kvm_seg, seg);
3796         return kvm_seg.selector;
3797 }
3798
3799 static void emulator_set_segment_selector(u16 sel, int seg,
3800                                           struct kvm_vcpu *vcpu)
3801 {
3802         struct kvm_segment kvm_seg;
3803
3804         kvm_get_segment(vcpu, &kvm_seg, seg);
3805         kvm_seg.selector = sel;
3806         kvm_set_segment(vcpu, &kvm_seg, seg);
3807 }
3808
3809 static struct x86_emulate_ops emulate_ops = {
3810         .read_std            = kvm_read_guest_virt_system,
3811         .write_std           = kvm_write_guest_virt_system,
3812         .fetch               = kvm_fetch_guest_virt,
3813         .read_emulated       = emulator_read_emulated,
3814         .write_emulated      = emulator_write_emulated,
3815         .cmpxchg_emulated    = emulator_cmpxchg_emulated,
3816         .pio_in_emulated     = emulator_pio_in_emulated,
3817         .pio_out_emulated    = emulator_pio_out_emulated,
3818         .get_cached_descriptor = emulator_get_cached_descriptor,
3819         .set_cached_descriptor = emulator_set_cached_descriptor,
3820         .get_segment_selector = emulator_get_segment_selector,
3821         .set_segment_selector = emulator_set_segment_selector,
3822         .get_cached_segment_base = emulator_get_cached_segment_base,
3823         .get_gdt             = emulator_get_gdt,
3824         .get_cr              = emulator_get_cr,
3825         .set_cr              = emulator_set_cr,
3826         .cpl                 = emulator_get_cpl,
3827         .get_dr              = emulator_get_dr,
3828         .set_dr              = emulator_set_dr,
3829         .set_msr             = kvm_set_msr,
3830         .get_msr             = kvm_get_msr,
3831 };
3832
3833 static void cache_all_regs(struct kvm_vcpu *vcpu)
3834 {
3835         kvm_register_read(vcpu, VCPU_REGS_RAX);
3836         kvm_register_read(vcpu, VCPU_REGS_RSP);
3837         kvm_register_read(vcpu, VCPU_REGS_RIP);
3838         vcpu->arch.regs_dirty = ~0;
3839 }
3840
3841 int emulate_instruction(struct kvm_vcpu *vcpu,
3842                         unsigned long cr2,
3843                         u16 error_code,
3844                         int emulation_type)
3845 {
3846         int r, shadow_mask;
3847         struct decode_cache *c;
3848
3849         kvm_clear_exception_queue(vcpu);
3850         vcpu->arch.mmio_fault_cr2 = cr2;
3851         /*
3852          * TODO: fix emulate.c to use guest_read/write_register
3853          * instead of direct ->regs accesses, can save hundred cycles
3854          * on Intel for instructions that don't read/change RSP, for
3855          * for example.
3856          */
3857         cache_all_regs(vcpu);
3858
3859         if (!(emulation_type & EMULTYPE_NO_DECODE)) {
3860                 int cs_db, cs_l;
3861                 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
3862
3863                 vcpu->arch.emulate_ctxt.vcpu = vcpu;
3864                 vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
3865                 vcpu->arch.emulate_ctxt.eip = kvm_rip_read(vcpu);
3866                 vcpu->arch.emulate_ctxt.mode =
3867                         (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
3868                         (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
3869                         ? X86EMUL_MODE_VM86 : cs_l
3870                         ? X86EMUL_MODE_PROT64 : cs_db
3871                         ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
3872
3873                 r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
3874                 trace_kvm_emulate_insn_start(vcpu);
3875
3876                 /* Only allow emulation of specific instructions on #UD
3877                  * (namely VMMCALL, sysenter, sysexit, syscall)*/
3878                 c = &vcpu->arch.emulate_ctxt.decode;
3879                 if (emulation_type & EMULTYPE_TRAP_UD) {
3880                         if (!c->twobyte)
3881                                 return EMULATE_FAIL;
3882                         switch (c->b) {
3883                         case 0x01: /* VMMCALL */
3884                                 if (c->modrm_mod != 3 || c->modrm_rm != 1)
3885                                         return EMULATE_FAIL;
3886                                 break;
3887                         case 0x34: /* sysenter */
3888                         case 0x35: /* sysexit */
3889                                 if (c->modrm_mod != 0 || c->modrm_rm != 0)
3890                                         return EMULATE_FAIL;
3891                                 break;
3892                         case 0x05: /* syscall */
3893                                 if (c->modrm_mod != 0 || c->modrm_rm != 0)
3894                                         return EMULATE_FAIL;
3895                                 break;
3896                         default:
3897                                 return EMULATE_FAIL;
3898                         }
3899
3900                         if (!(c->modrm_reg == 0 || c->modrm_reg == 3))
3901                                 return EMULATE_FAIL;
3902                 }
3903
3904                 ++vcpu->stat.insn_emulation;
3905                 if (r)  {
3906                         ++vcpu->stat.insn_emulation_fail;
3907                         trace_kvm_emulate_insn_failed(vcpu);
3908                         if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
3909                                 return EMULATE_DONE;
3910                         return EMULATE_FAIL;
3911                 }
3912         }
3913
3914         if (emulation_type & EMULTYPE_SKIP) {
3915                 kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.decode.eip);
3916                 return EMULATE_DONE;
3917         }
3918
3919 restart:
3920         r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
3921
3922         if (r) { /* emulation failed */
3923                 /*
3924                  * if emulation was due to access to shadowed page table
3925                  * and it failed try to unshadow page and re-entetr the
3926                  * guest to let CPU execute the instruction.
3927                  */
3928                 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
3929                         return EMULATE_DONE;
3930
3931                 trace_kvm_emulate_insn_failed(vcpu);
3932                 kvm_report_emulation_failure(vcpu, "mmio");
3933                 return EMULATE_FAIL;
3934         }
3935
3936         shadow_mask = vcpu->arch.emulate_ctxt.interruptibility;
3937         kvm_x86_ops->set_interrupt_shadow(vcpu, shadow_mask);
3938         kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
3939         kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
3940
3941         if (vcpu->arch.pio.count) {
3942                 if (!vcpu->arch.pio.in)
3943                         vcpu->arch.pio.count = 0;
3944                 return EMULATE_DO_MMIO;
3945         }
3946
3947         if (vcpu->mmio_needed) {
3948                 if (vcpu->mmio_is_write)
3949                         vcpu->mmio_needed = 0;
3950                 return EMULATE_DO_MMIO;
3951         }
3952
3953         if (vcpu->arch.exception.pending)
3954                 vcpu->arch.emulate_ctxt.restart = false;
3955
3956         if (vcpu->arch.emulate_ctxt.restart)
3957                 goto restart;
3958
3959         return EMULATE_DONE;
3960 }
3961 EXPORT_SYMBOL_GPL(emulate_instruction);
3962
3963 int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port)
3964 {
3965         unsigned long val = kvm_register_read(vcpu, VCPU_REGS_RAX);
3966         int ret = emulator_pio_out_emulated(size, port, &val, 1, vcpu);
3967         /* do not return to emulator after return from userspace */
3968         vcpu->arch.pio.count = 0;
3969         return ret;
3970 }
3971 EXPORT_SYMBOL_GPL(kvm_fast_pio_out);
3972
3973 static void bounce_off(void *info)
3974 {
3975         /* nothing */
3976 }
3977
3978 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
3979                                      void *data)
3980 {
3981         struct cpufreq_freqs *freq = data;
3982         struct kvm *kvm;
3983         struct kvm_vcpu *vcpu;
3984         int i, send_ipi = 0;
3985
3986         if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
3987                 return 0;
3988         if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
3989                 return 0;
3990         per_cpu(cpu_tsc_khz, freq->cpu) = freq->new;
3991
3992         spin_lock(&kvm_lock);
3993         list_for_each_entry(kvm, &vm_list, vm_list) {
3994                 kvm_for_each_vcpu(i, vcpu, kvm) {
3995                         if (vcpu->cpu != freq->cpu)
3996                                 continue;
3997                         if (!kvm_request_guest_time_update(vcpu))
3998                                 continue;
3999                         if (vcpu->cpu != smp_processor_id())
4000                                 send_ipi++;
4001                 }
4002         }
4003         spin_unlock(&kvm_lock);
4004
4005         if (freq->old < freq->new && send_ipi) {
4006                 /*
4007                  * We upscale the frequency.  Must make the guest
4008                  * doesn't see old kvmclock values while running with
4009                  * the new frequency, otherwise we risk the guest sees
4010                  * time go backwards.
4011                  *
4012                  * In case we update the frequency for another cpu
4013                  * (which might be in guest context) send an interrupt
4014                  * to kick the cpu out of guest context.  Next time
4015                  * guest context is entered kvmclock will be updated,
4016                  * so the guest will not see stale values.
4017                  */
4018                 smp_call_function_single(freq->cpu, bounce_off, NULL, 1);
4019         }
4020         return 0;
4021 }
4022
4023 static struct notifier_block kvmclock_cpufreq_notifier_block = {
4024         .notifier_call  = kvmclock_cpufreq_notifier
4025 };
4026
4027 static void kvm_timer_init(void)
4028 {
4029         int cpu;
4030
4031         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
4032                 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
4033                                           CPUFREQ_TRANSITION_NOTIFIER);
4034                 for_each_online_cpu(cpu) {
4035                         unsigned long khz = cpufreq_get(cpu);
4036                         if (!khz)
4037                                 khz = tsc_khz;
4038                         per_cpu(cpu_tsc_khz, cpu) = khz;
4039                 }
4040         } else {
4041                 for_each_possible_cpu(cpu)
4042                         per_cpu(cpu_tsc_khz, cpu) = tsc_khz;
4043         }
4044 }
4045
4046 static DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu);
4047
4048 static int kvm_is_in_guest(void)
4049 {
4050         return percpu_read(current_vcpu) != NULL;
4051 }
4052
4053 static int kvm_is_user_mode(void)
4054 {
4055         int user_mode = 3;
4056
4057         if (percpu_read(current_vcpu))
4058                 user_mode = kvm_x86_ops->get_cpl(percpu_read(current_vcpu));
4059
4060         return user_mode != 0;
4061 }
4062
4063 static unsigned long kvm_get_guest_ip(void)
4064 {
4065         unsigned long ip = 0;
4066
4067         if (percpu_read(current_vcpu))
4068                 ip = kvm_rip_read(percpu_read(current_vcpu));
4069
4070         return ip;
4071 }
4072
4073 static struct perf_guest_info_callbacks kvm_guest_cbs = {
4074         .is_in_guest            = kvm_is_in_guest,
4075         .is_user_mode           = kvm_is_user_mode,
4076         .get_guest_ip           = kvm_get_guest_ip,
4077 };
4078
4079 void kvm_before_handle_nmi(struct kvm_vcpu *vcpu)
4080 {
4081         percpu_write(current_vcpu, vcpu);
4082 }
4083 EXPORT_SYMBOL_GPL(kvm_before_handle_nmi);
4084
4085 void kvm_after_handle_nmi(struct kvm_vcpu *vcpu)
4086 {
4087         percpu_write(current_vcpu, NULL);
4088 }
4089 EXPORT_SYMBOL_GPL(kvm_after_handle_nmi);
4090
4091 int kvm_arch_init(void *opaque)
4092 {
4093         int r;
4094         struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
4095
4096         if (kvm_x86_ops) {
4097                 printk(KERN_ERR "kvm: already loaded the other module\n");
4098                 r = -EEXIST;
4099                 goto out;
4100         }
4101
4102         if (!ops->cpu_has_kvm_support()) {
4103                 printk(KERN_ERR "kvm: no hardware support\n");
4104                 r = -EOPNOTSUPP;
4105                 goto out;
4106         }
4107         if (ops->disabled_by_bios()) {
4108                 printk(KERN_ERR "kvm: disabled by bios\n");
4109                 r = -EOPNOTSUPP;
4110                 goto out;
4111         }
4112
4113         r = kvm_mmu_module_init();
4114         if (r)
4115                 goto out;
4116
4117         kvm_init_msr_list();
4118
4119         kvm_x86_ops = ops;
4120         kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
4121         kvm_mmu_set_base_ptes(PT_PRESENT_MASK);
4122         kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
4123                         PT_DIRTY_MASK, PT64_NX_MASK, 0);
4124
4125         kvm_timer_init();
4126
4127         perf_register_guest_info_callbacks(&kvm_guest_cbs);
4128
4129         return 0;
4130
4131 out:
4132         return r;
4133 }
4134
4135 void kvm_arch_exit(void)
4136 {
4137         perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
4138
4139         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
4140                 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
4141                                             CPUFREQ_TRANSITION_NOTIFIER);
4142         kvm_x86_ops = NULL;
4143         kvm_mmu_module_exit();
4144 }
4145
4146 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
4147 {
4148         ++vcpu->stat.halt_exits;
4149         if (irqchip_in_kernel(vcpu->kvm)) {
4150                 vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
4151                 return 1;
4152         } else {
4153                 vcpu->run->exit_reason = KVM_EXIT_HLT;
4154                 return 0;
4155         }
4156 }
4157 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
4158
4159 static inline gpa_t hc_gpa(struct kvm_vcpu *vcpu, unsigned long a0,
4160                            unsigned long a1)
4161 {
4162         if (is_long_mode(vcpu))
4163                 return a0;
4164         else
4165                 return a0 | ((gpa_t)a1 << 32);
4166 }
4167
4168 int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
4169 {
4170         u64 param, ingpa, outgpa, ret;
4171         uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
4172         bool fast, longmode;
4173         int cs_db, cs_l;
4174
4175         /*
4176          * hypercall generates UD from non zero cpl and real mode
4177          * per HYPER-V spec
4178          */
4179         if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
4180                 kvm_queue_exception(vcpu, UD_VECTOR);
4181                 return 0;
4182         }
4183
4184         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
4185         longmode = is_long_mode(vcpu) && cs_l == 1;
4186
4187         if (!longmode) {
4188                 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
4189                         (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
4190                 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
4191                         (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
4192                 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
4193                         (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
4194         }
4195 #ifdef CONFIG_X86_64
4196         else {
4197                 param = kvm_register_read(vcpu, VCPU_REGS_RCX);
4198                 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
4199                 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
4200         }
4201 #endif
4202
4203         code = param & 0xffff;
4204         fast = (param >> 16) & 0x1;
4205         rep_cnt = (param >> 32) & 0xfff;
4206         rep_idx = (param >> 48) & 0xfff;
4207
4208         trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
4209
4210         switch (code) {
4211         case HV_X64_HV_NOTIFY_LONG_SPIN_WAIT:
4212                 kvm_vcpu_on_spin(vcpu);
4213                 break;
4214         default:
4215                 res = HV_STATUS_INVALID_HYPERCALL_CODE;
4216                 break;
4217         }
4218
4219         ret = res | (((u64)rep_done & 0xfff) << 32);
4220         if (longmode) {
4221                 kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
4222         } else {
4223                 kvm_register_write(vcpu, VCPU_REGS_RDX, ret >> 32);
4224                 kvm_register_write(vcpu, VCPU_REGS_RAX, ret & 0xffffffff);
4225         }
4226
4227         return 1;
4228 }
4229
4230 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
4231 {
4232         unsigned long nr, a0, a1, a2, a3, ret;
4233         int r = 1;
4234
4235         if (kvm_hv_hypercall_enabled(vcpu->kvm))
4236                 return kvm_hv_hypercall(vcpu);
4237
4238         nr = kvm_register_read(vcpu, VCPU_REGS_RAX);
4239         a0 = kvm_register_read(vcpu, VCPU_REGS_RBX);
4240         a1 = kvm_register_read(vcpu, VCPU_REGS_RCX);
4241         a2 = kvm_register_read(vcpu, VCPU_REGS_RDX);
4242         a3 = kvm_register_read(vcpu, VCPU_REGS_RSI);
4243
4244         trace_kvm_hypercall(nr, a0, a1, a2, a3);
4245
4246         if (!is_long_mode(vcpu)) {
4247                 nr &= 0xFFFFFFFF;
4248                 a0 &= 0xFFFFFFFF;
4249                 a1 &= 0xFFFFFFFF;
4250                 a2 &= 0xFFFFFFFF;
4251                 a3 &= 0xFFFFFFFF;
4252         }
4253
4254         if (kvm_x86_ops->get_cpl(vcpu) != 0) {
4255                 ret = -KVM_EPERM;
4256                 goto out;
4257         }
4258
4259         switch (nr) {
4260         case KVM_HC_VAPIC_POLL_IRQ:
4261                 ret = 0;
4262                 break;
4263         case KVM_HC_MMU_OP:
4264                 r = kvm_pv_mmu_op(vcpu, a0, hc_gpa(vcpu, a1, a2), &ret);
4265                 break;
4266         default:
4267                 ret = -KVM_ENOSYS;
4268                 break;
4269         }
4270 out:
4271         kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
4272         ++vcpu->stat.hypercalls;
4273         return r;
4274 }
4275 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
4276
4277 int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
4278 {
4279         char instruction[3];
4280         unsigned long rip = kvm_rip_read(vcpu);
4281
4282         /*
4283          * Blow out the MMU to ensure that no other VCPU has an active mapping
4284          * to ensure that the updated hypercall appears atomically across all
4285          * VCPUs.
4286          */
4287         kvm_mmu_zap_all(vcpu->kvm);
4288
4289         kvm_x86_ops->patch_hypercall(vcpu, instruction);
4290
4291         return emulator_write_emulated(rip, instruction, 3, NULL, vcpu);
4292 }
4293
4294 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
4295 {
4296         struct desc_ptr dt = { limit, base };
4297
4298         kvm_x86_ops->set_gdt(vcpu, &dt);
4299 }
4300
4301 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
4302 {
4303         struct desc_ptr dt = { limit, base };
4304
4305         kvm_x86_ops->set_idt(vcpu, &dt);
4306 }
4307
4308 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
4309 {
4310         struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
4311         int j, nent = vcpu->arch.cpuid_nent;
4312
4313         e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
4314         /* when no next entry is found, the current entry[i] is reselected */
4315         for (j = i + 1; ; j = (j + 1) % nent) {
4316                 struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
4317                 if (ej->function == e->function) {
4318                         ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
4319                         return j;
4320                 }
4321         }
4322         return 0; /* silence gcc, even though control never reaches here */
4323 }
4324
4325 /* find an entry with matching function, matching index (if needed), and that
4326  * should be read next (if it's stateful) */
4327 static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
4328         u32 function, u32 index)
4329 {
4330         if (e->function != function)
4331                 return 0;
4332         if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
4333                 return 0;
4334         if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
4335             !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
4336                 return 0;
4337         return 1;
4338 }
4339
4340 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
4341                                               u32 function, u32 index)
4342 {
4343         int i;
4344         struct kvm_cpuid_entry2 *best = NULL;
4345
4346         for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
4347                 struct kvm_cpuid_entry2 *e;
4348
4349                 e = &vcpu->arch.cpuid_entries[i];
4350                 if (is_matching_cpuid_entry(e, function, index)) {
4351                         if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
4352                                 move_to_next_stateful_cpuid_entry(vcpu, i);
4353                         best = e;
4354                         break;
4355                 }
4356                 /*
4357                  * Both basic or both extended?
4358                  */
4359                 if (((e->function ^ function) & 0x80000000) == 0)
4360                         if (!best || e->function > best->function)
4361                                 best = e;
4362         }
4363         return best;
4364 }
4365 EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry);
4366
4367 int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
4368 {
4369         struct kvm_cpuid_entry2 *best;
4370
4371         best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0);
4372         if (!best || best->eax < 0x80000008)
4373                 goto not_found;
4374         best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
4375         if (best)
4376                 return best->eax & 0xff;
4377 not_found:
4378         return 36;
4379 }
4380
4381 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
4382 {
4383         u32 function, index;
4384         struct kvm_cpuid_entry2 *best;
4385
4386         function = kvm_register_read(vcpu, VCPU_REGS_RAX);
4387         index = kvm_register_read(vcpu, VCPU_REGS_RCX);
4388         kvm_register_write(vcpu, VCPU_REGS_RAX, 0);
4389         kvm_register_write(vcpu, VCPU_REGS_RBX, 0);
4390         kvm_register_write(vcpu, VCPU_REGS_RCX, 0);
4391         kvm_register_write(vcpu, VCPU_REGS_RDX, 0);
4392         best = kvm_find_cpuid_entry(vcpu, function, index);
4393         if (best) {
4394                 kvm_register_write(vcpu, VCPU_REGS_RAX, best->eax);
4395                 kvm_register_write(vcpu, VCPU_REGS_RBX, best->ebx);
4396                 kvm_register_write(vcpu, VCPU_REGS_RCX, best->ecx);
4397                 kvm_register_write(vcpu, VCPU_REGS_RDX, best->edx);
4398         }
4399         kvm_x86_ops->skip_emulated_instruction(vcpu);
4400         trace_kvm_cpuid(function,
4401                         kvm_register_read(vcpu, VCPU_REGS_RAX),
4402                         kvm_register_read(vcpu, VCPU_REGS_RBX),
4403                         kvm_register_read(vcpu, VCPU_REGS_RCX),
4404                         kvm_register_read(vcpu, VCPU_REGS_RDX));
4405 }
4406 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
4407
4408 /*
4409  * Check if userspace requested an interrupt window, and that the
4410  * interrupt window is open.
4411  *
4412  * No need to exit to userspace if we already have an interrupt queued.
4413  */
4414 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu)
4415 {
4416         return (!irqchip_in_kernel(vcpu->kvm) && !kvm_cpu_has_interrupt(vcpu) &&
4417                 vcpu->run->request_interrupt_window &&
4418                 kvm_arch_interrupt_allowed(vcpu));
4419 }
4420
4421 static void post_kvm_run_save(struct kvm_vcpu *vcpu)
4422 {
4423         struct kvm_run *kvm_run = vcpu->run;
4424
4425         kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
4426         kvm_run->cr8 = kvm_get_cr8(vcpu);
4427         kvm_run->apic_base = kvm_get_apic_base(vcpu);
4428         if (irqchip_in_kernel(vcpu->kvm))
4429                 kvm_run->ready_for_interrupt_injection = 1;
4430         else
4431                 kvm_run->ready_for_interrupt_injection =
4432                         kvm_arch_interrupt_allowed(vcpu) &&
4433                         !kvm_cpu_has_interrupt(vcpu) &&
4434                         !kvm_event_needs_reinjection(vcpu);
4435 }
4436
4437 static void vapic_enter(struct kvm_vcpu *vcpu)
4438 {
4439         struct kvm_lapic *apic = vcpu->arch.apic;
4440         struct page *page;
4441
4442         if (!apic || !apic->vapic_addr)
4443                 return;
4444
4445         page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
4446
4447         vcpu->arch.apic->vapic_page = page;
4448 }
4449
4450 static void vapic_exit(struct kvm_vcpu *vcpu)
4451 {
4452         struct kvm_lapic *apic = vcpu->arch.apic;
4453         int idx;
4454
4455         if (!apic || !apic->vapic_addr)
4456                 return;
4457
4458         idx = srcu_read_lock(&vcpu->kvm->srcu);
4459         kvm_release_page_dirty(apic->vapic_page);
4460         mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
4461         srcu_read_unlock(&vcpu->kvm->srcu, idx);
4462 }
4463
4464 static void update_cr8_intercept(struct kvm_vcpu *vcpu)
4465 {
4466         int max_irr, tpr;
4467
4468         if (!kvm_x86_ops->update_cr8_intercept)
4469                 return;
4470
4471         if (!vcpu->arch.apic)
4472                 return;
4473
4474         if (!vcpu->arch.apic->vapic_addr)
4475                 max_irr = kvm_lapic_find_highest_irr(vcpu);
4476         else
4477                 max_irr = -1;
4478
4479         if (max_irr != -1)
4480                 max_irr >>= 4;
4481
4482         tpr = kvm_lapic_get_cr8(vcpu);
4483
4484         kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr);
4485 }
4486
4487 static void inject_pending_event(struct kvm_vcpu *vcpu)
4488 {
4489         /* try to reinject previous events if any */
4490         if (vcpu->arch.exception.pending) {
4491                 trace_kvm_inj_exception(vcpu->arch.exception.nr,
4492                                         vcpu->arch.exception.has_error_code,
4493                                         vcpu->arch.exception.error_code);
4494                 kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
4495                                           vcpu->arch.exception.has_error_code,
4496                                           vcpu->arch.exception.error_code,
4497                                           vcpu->arch.exception.reinject);
4498                 return;
4499         }
4500
4501         if (vcpu->arch.nmi_injected) {
4502                 kvm_x86_ops->set_nmi(vcpu);
4503                 return;
4504         }
4505
4506         if (vcpu->arch.interrupt.pending) {
4507                 kvm_x86_ops->set_irq(vcpu);
4508                 return;
4509         }
4510
4511         /* try to inject new event if pending */
4512         if (vcpu->arch.nmi_pending) {
4513                 if (kvm_x86_ops->nmi_allowed(vcpu)) {
4514                         vcpu->arch.nmi_pending = false;
4515                         vcpu->arch.nmi_injected = true;
4516                         kvm_x86_ops->set_nmi(vcpu);
4517                 }
4518         } else if (kvm_cpu_has_interrupt(vcpu)) {
4519                 if (kvm_x86_ops->interrupt_allowed(vcpu)) {
4520                         kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu),
4521                                             false);
4522                         kvm_x86_ops->set_irq(vcpu);
4523                 }
4524         }
4525 }
4526
4527 static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
4528 {
4529         int r;
4530         bool req_int_win = !irqchip_in_kernel(vcpu->kvm) &&
4531                 vcpu->run->request_interrupt_window;
4532
4533         if (vcpu->requests)
4534                 if (test_and_clear_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
4535                         kvm_mmu_unload(vcpu);
4536
4537         r = kvm_mmu_reload(vcpu);
4538         if (unlikely(r))
4539                 goto out;
4540
4541         if (vcpu->requests) {
4542                 if (test_and_clear_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests))
4543                         __kvm_migrate_timers(vcpu);
4544                 if (test_and_clear_bit(KVM_REQ_KVMCLOCK_UPDATE, &vcpu->requests))
4545                         kvm_write_guest_time(vcpu);
4546                 if (test_and_clear_bit(KVM_REQ_MMU_SYNC, &vcpu->requests))
4547                         kvm_mmu_sync_roots(vcpu);
4548                 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
4549                         kvm_x86_ops->tlb_flush(vcpu);
4550                 if (test_and_clear_bit(KVM_REQ_REPORT_TPR_ACCESS,
4551                                        &vcpu->requests)) {
4552                         vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS;
4553                         r = 0;
4554                         goto out;
4555                 }
4556                 if (test_and_clear_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests)) {
4557                         vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
4558                         r = 0;
4559                         goto out;
4560                 }
4561                 if (test_and_clear_bit(KVM_REQ_DEACTIVATE_FPU, &vcpu->requests)) {
4562                         vcpu->fpu_active = 0;
4563                         kvm_x86_ops->fpu_deactivate(vcpu);
4564                 }
4565         }
4566
4567         preempt_disable();
4568
4569         kvm_x86_ops->prepare_guest_switch(vcpu);
4570         if (vcpu->fpu_active)
4571                 kvm_load_guest_fpu(vcpu);
4572
4573         local_irq_disable();
4574
4575         clear_bit(KVM_REQ_KICK, &vcpu->requests);
4576         smp_mb__after_clear_bit();
4577
4578         if (vcpu->requests || need_resched() || signal_pending(current)) {
4579                 set_bit(KVM_REQ_KICK, &vcpu->requests);
4580                 local_irq_enable();
4581                 preempt_enable();
4582                 r = 1;
4583                 goto out;
4584         }
4585
4586         inject_pending_event(vcpu);
4587
4588         /* enable NMI/IRQ window open exits if needed */
4589         if (vcpu->arch.nmi_pending)
4590                 kvm_x86_ops->enable_nmi_window(vcpu);
4591         else if (kvm_cpu_has_interrupt(vcpu) || req_int_win)
4592                 kvm_x86_ops->enable_irq_window(vcpu);
4593
4594         if (kvm_lapic_enabled(vcpu)) {
4595                 update_cr8_intercept(vcpu);
4596                 kvm_lapic_sync_to_vapic(vcpu);
4597         }
4598
4599         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
4600
4601         kvm_guest_enter();
4602
4603         if (unlikely(vcpu->arch.switch_db_regs)) {
4604                 set_debugreg(0, 7);
4605                 set_debugreg(vcpu->arch.eff_db[0], 0);
4606                 set_debugreg(vcpu->arch.eff_db[1], 1);
4607                 set_debugreg(vcpu->arch.eff_db[2], 2);
4608                 set_debugreg(vcpu->arch.eff_db[3], 3);
4609         }
4610
4611         trace_kvm_entry(vcpu->vcpu_id);
4612         kvm_x86_ops->run(vcpu);
4613
4614         /*
4615          * If the guest has used debug registers, at least dr7
4616          * will be disabled while returning to the host.
4617          * If we don't have active breakpoints in the host, we don't
4618          * care about the messed up debug address registers. But if
4619          * we have some of them active, restore the old state.
4620          */
4621         if (hw_breakpoint_active())
4622                 hw_breakpoint_restore();
4623
4624         set_bit(KVM_REQ_KICK, &vcpu->requests);
4625         local_irq_enable();
4626
4627         ++vcpu->stat.exits;
4628
4629         /*
4630          * We must have an instruction between local_irq_enable() and
4631          * kvm_guest_exit(), so the timer interrupt isn't delayed by
4632          * the interrupt shadow.  The stat.exits increment will do nicely.
4633          * But we need to prevent reordering, hence this barrier():
4634          */
4635         barrier();
4636
4637         kvm_guest_exit();
4638
4639         preempt_enable();
4640
4641         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
4642
4643         /*
4644          * Profile KVM exit RIPs:
4645          */
4646         if (unlikely(prof_on == KVM_PROFILING)) {
4647                 unsigned long rip = kvm_rip_read(vcpu);
4648                 profile_hit(KVM_PROFILING, (void *)rip);
4649         }
4650
4651
4652         kvm_lapic_sync_from_vapic(vcpu);
4653
4654         r = kvm_x86_ops->handle_exit(vcpu);
4655 out:
4656         return r;
4657 }
4658
4659
4660 static int __vcpu_run(struct kvm_vcpu *vcpu)
4661 {
4662         int r;
4663         struct kvm *kvm = vcpu->kvm;
4664
4665         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
4666                 pr_debug("vcpu %d received sipi with vector # %x\n",
4667                          vcpu->vcpu_id, vcpu->arch.sipi_vector);
4668                 kvm_lapic_reset(vcpu);
4669                 r = kvm_arch_vcpu_reset(vcpu);
4670                 if (r)
4671                         return r;
4672                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
4673         }
4674
4675         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
4676         vapic_enter(vcpu);
4677
4678         r = 1;
4679         while (r > 0) {
4680                 if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
4681                         r = vcpu_enter_guest(vcpu);
4682                 else {
4683                         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
4684                         kvm_vcpu_block(vcpu);
4685                         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
4686                         if (test_and_clear_bit(KVM_REQ_UNHALT, &vcpu->requests))
4687                         {
4688                                 switch(vcpu->arch.mp_state) {
4689                                 case KVM_MP_STATE_HALTED:
4690                                         vcpu->arch.mp_state =
4691                                                 KVM_MP_STATE_RUNNABLE;
4692                                 case KVM_MP_STATE_RUNNABLE:
4693                                         break;
4694                                 case KVM_MP_STATE_SIPI_RECEIVED:
4695                                 default:
4696                                         r = -EINTR;
4697                                         break;
4698                                 }
4699                         }
4700                 }
4701
4702                 if (r <= 0)
4703                         break;
4704
4705                 clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
4706                 if (kvm_cpu_has_pending_timer(vcpu))
4707                         kvm_inject_pending_timer_irqs(vcpu);
4708
4709                 if (dm_request_for_irq_injection(vcpu)) {
4710                         r = -EINTR;
4711                         vcpu->run->exit_reason = KVM_EXIT_INTR;
4712                         ++vcpu->stat.request_irq_exits;
4713                 }
4714                 if (signal_pending(current)) {
4715                         r = -EINTR;
4716                         vcpu->run->exit_reason = KVM_EXIT_INTR;
4717                         ++vcpu->stat.signal_exits;
4718                 }
4719                 if (need_resched()) {
4720                         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
4721                         kvm_resched(vcpu);
4722                         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
4723                 }
4724         }
4725
4726         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
4727
4728         vapic_exit(vcpu);
4729
4730         return r;
4731 }
4732
4733 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
4734 {
4735         int r;
4736         sigset_t sigsaved;
4737
4738         vcpu_load(vcpu);
4739
4740         if (vcpu->sigset_active)
4741                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
4742
4743         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
4744                 kvm_vcpu_block(vcpu);
4745                 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
4746                 r = -EAGAIN;
4747                 goto out;
4748         }
4749
4750         /* re-sync apic's tpr */
4751         if (!irqchip_in_kernel(vcpu->kvm))
4752                 kvm_set_cr8(vcpu, kvm_run->cr8);
4753
4754         if (vcpu->arch.pio.count || vcpu->mmio_needed ||
4755             vcpu->arch.emulate_ctxt.restart) {
4756                 if (vcpu->mmio_needed) {
4757                         memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
4758                         vcpu->mmio_read_completed = 1;
4759                         vcpu->mmio_needed = 0;
4760                 }
4761                 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
4762                 r = emulate_instruction(vcpu, 0, 0, EMULTYPE_NO_DECODE);
4763                 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
4764                 if (r == EMULATE_DO_MMIO) {
4765                         r = 0;
4766                         goto out;
4767                 }
4768         }
4769         if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL)
4770                 kvm_register_write(vcpu, VCPU_REGS_RAX,
4771                                      kvm_run->hypercall.ret);
4772
4773         r = __vcpu_run(vcpu);
4774
4775 out:
4776         post_kvm_run_save(vcpu);
4777         if (vcpu->sigset_active)
4778                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
4779
4780         vcpu_put(vcpu);
4781         return r;
4782 }
4783
4784 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
4785 {
4786         vcpu_load(vcpu);
4787
4788         regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
4789         regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX);
4790         regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX);
4791         regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX);
4792         regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI);
4793         regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI);
4794         regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
4795         regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP);
4796 #ifdef CONFIG_X86_64
4797         regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8);
4798         regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9);
4799         regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10);
4800         regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11);
4801         regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12);
4802         regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13);
4803         regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14);
4804         regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15);
4805 #endif
4806
4807         regs->rip = kvm_rip_read(vcpu);
4808         regs->rflags = kvm_get_rflags(vcpu);
4809
4810         vcpu_put(vcpu);
4811
4812         return 0;
4813 }
4814
4815 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
4816 {
4817         vcpu_load(vcpu);
4818
4819         kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
4820         kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx);
4821         kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx);
4822         kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx);
4823         kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi);
4824         kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi);
4825         kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp);
4826         kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp);
4827 #ifdef CONFIG_X86_64
4828         kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8);
4829         kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9);
4830         kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10);
4831         kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11);
4832         kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12);
4833         kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13);
4834         kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14);
4835         kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15);
4836 #endif
4837
4838         kvm_rip_write(vcpu, regs->rip);
4839         kvm_set_rflags(vcpu, regs->rflags);
4840
4841         vcpu->arch.exception.pending = false;
4842
4843         vcpu_put(vcpu);
4844
4845         return 0;
4846 }
4847
4848 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
4849 {
4850         struct kvm_segment cs;
4851
4852         kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
4853         *db = cs.db;
4854         *l = cs.l;
4855 }
4856 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
4857
4858 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
4859                                   struct kvm_sregs *sregs)
4860 {
4861         struct desc_ptr dt;
4862
4863         vcpu_load(vcpu);
4864
4865         kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
4866         kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
4867         kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
4868         kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
4869         kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
4870         kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
4871
4872         kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
4873         kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
4874
4875         kvm_x86_ops->get_idt(vcpu, &dt);
4876         sregs->idt.limit = dt.size;
4877         sregs->idt.base = dt.address;
4878         kvm_x86_ops->get_gdt(vcpu, &dt);
4879         sregs->gdt.limit = dt.size;
4880         sregs->gdt.base = dt.address;
4881
4882         sregs->cr0 = kvm_read_cr0(vcpu);
4883         sregs->cr2 = vcpu->arch.cr2;
4884         sregs->cr3 = vcpu->arch.cr3;
4885         sregs->cr4 = kvm_read_cr4(vcpu);
4886         sregs->cr8 = kvm_get_cr8(vcpu);
4887         sregs->efer = vcpu->arch.efer;
4888         sregs->apic_base = kvm_get_apic_base(vcpu);
4889
4890         memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap);
4891
4892         if (vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft)
4893                 set_bit(vcpu->arch.interrupt.nr,
4894                         (unsigned long *)sregs->interrupt_bitmap);
4895
4896         vcpu_put(vcpu);
4897
4898         return 0;
4899 }
4900
4901 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
4902                                     struct kvm_mp_state *mp_state)
4903 {
4904         vcpu_load(vcpu);
4905         mp_state->mp_state = vcpu->arch.mp_state;
4906         vcpu_put(vcpu);
4907         return 0;
4908 }
4909
4910 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
4911                                     struct kvm_mp_state *mp_state)
4912 {
4913         vcpu_load(vcpu);
4914         vcpu->arch.mp_state = mp_state->mp_state;
4915         vcpu_put(vcpu);
4916         return 0;
4917 }
4918
4919 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
4920                     bool has_error_code, u32 error_code)
4921 {
4922         int cs_db, cs_l, ret;
4923         cache_all_regs(vcpu);
4924
4925         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
4926
4927         vcpu->arch.emulate_ctxt.vcpu = vcpu;
4928         vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
4929         vcpu->arch.emulate_ctxt.eip = kvm_rip_read(vcpu);
4930         vcpu->arch.emulate_ctxt.mode =
4931                 (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
4932                 (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
4933                 ? X86EMUL_MODE_VM86 : cs_l
4934                 ? X86EMUL_MODE_PROT64 : cs_db
4935                 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
4936
4937         ret = emulator_task_switch(&vcpu->arch.emulate_ctxt, &emulate_ops,
4938                                    tss_selector, reason, has_error_code,
4939                                    error_code);
4940
4941         if (ret)
4942                 return EMULATE_FAIL;
4943
4944         kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
4945         kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
4946         return EMULATE_DONE;
4947 }
4948 EXPORT_SYMBOL_GPL(kvm_task_switch);
4949
4950 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
4951                                   struct kvm_sregs *sregs)
4952 {
4953         int mmu_reset_needed = 0;
4954         int pending_vec, max_bits;
4955         struct desc_ptr dt;
4956
4957         vcpu_load(vcpu);
4958
4959         dt.size = sregs->idt.limit;
4960         dt.address = sregs->idt.base;
4961         kvm_x86_ops->set_idt(vcpu, &dt);
4962         dt.size = sregs->gdt.limit;
4963         dt.address = sregs->gdt.base;
4964         kvm_x86_ops->set_gdt(vcpu, &dt);
4965
4966         vcpu->arch.cr2 = sregs->cr2;
4967         mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3;
4968         vcpu->arch.cr3 = sregs->cr3;
4969
4970         kvm_set_cr8(vcpu, sregs->cr8);
4971
4972         mmu_reset_needed |= vcpu->arch.efer != sregs->efer;
4973         kvm_x86_ops->set_efer(vcpu, sregs->efer);
4974         kvm_set_apic_base(vcpu, sregs->apic_base);
4975
4976         mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0;
4977         kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
4978         vcpu->arch.cr0 = sregs->cr0;
4979
4980         mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
4981         kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
4982         if (!is_long_mode(vcpu) && is_pae(vcpu)) {
4983                 load_pdptrs(vcpu, vcpu->arch.cr3);
4984                 mmu_reset_needed = 1;
4985         }
4986
4987         if (mmu_reset_needed)
4988                 kvm_mmu_reset_context(vcpu);
4989
4990         max_bits = (sizeof sregs->interrupt_bitmap) << 3;
4991         pending_vec = find_first_bit(
4992                 (const unsigned long *)sregs->interrupt_bitmap, max_bits);
4993         if (pending_vec < max_bits) {
4994                 kvm_queue_interrupt(vcpu, pending_vec, false);
4995                 pr_debug("Set back pending irq %d\n", pending_vec);
4996                 if (irqchip_in_kernel(vcpu->kvm))
4997                         kvm_pic_clear_isr_ack(vcpu->kvm);
4998         }
4999
5000         kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
5001         kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
5002         kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
5003         kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
5004         kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
5005         kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
5006
5007         kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
5008         kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
5009
5010         update_cr8_intercept(vcpu);
5011
5012         /* Older userspace won't unhalt the vcpu on reset. */
5013         if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
5014             sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
5015             !is_protmode(vcpu))
5016                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
5017
5018         vcpu_put(vcpu);
5019
5020         return 0;
5021 }
5022
5023 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
5024                                         struct kvm_guest_debug *dbg)
5025 {
5026         unsigned long rflags;
5027         int i, r;
5028
5029         vcpu_load(vcpu);
5030
5031         if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) {
5032                 r = -EBUSY;
5033                 if (vcpu->arch.exception.pending)
5034                         goto unlock_out;
5035                 if (dbg->control & KVM_GUESTDBG_INJECT_DB)
5036                         kvm_queue_exception(vcpu, DB_VECTOR);
5037                 else
5038                         kvm_queue_exception(vcpu, BP_VECTOR);
5039         }
5040
5041         /*
5042          * Read rflags as long as potentially injected trace flags are still
5043          * filtered out.
5044          */
5045         rflags = kvm_get_rflags(vcpu);
5046
5047         vcpu->guest_debug = dbg->control;
5048         if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
5049                 vcpu->guest_debug = 0;
5050
5051         if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
5052                 for (i = 0; i < KVM_NR_DB_REGS; ++i)
5053                         vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
5054                 vcpu->arch.switch_db_regs =
5055                         (dbg->arch.debugreg[7] & DR7_BP_EN_MASK);
5056         } else {
5057                 for (i = 0; i < KVM_NR_DB_REGS; i++)
5058                         vcpu->arch.eff_db[i] = vcpu->arch.db[i];
5059                 vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK);
5060         }
5061
5062         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
5063                 vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) +
5064                         get_segment_base(vcpu, VCPU_SREG_CS);
5065
5066         /*
5067          * Trigger an rflags update that will inject or remove the trace
5068          * flags.
5069          */
5070         kvm_set_rflags(vcpu, rflags);
5071
5072         kvm_x86_ops->set_guest_debug(vcpu, dbg);
5073
5074         r = 0;
5075
5076 unlock_out:
5077         vcpu_put(vcpu);
5078
5079         return r;
5080 }
5081
5082 /*
5083  * fxsave fpu state.  Taken from x86_64/processor.h.  To be killed when
5084  * we have asm/x86/processor.h
5085  */
5086 struct fxsave {
5087         u16     cwd;
5088         u16     swd;
5089         u16     twd;
5090         u16     fop;
5091         u64     rip;
5092         u64     rdp;
5093         u32     mxcsr;
5094         u32     mxcsr_mask;
5095         u32     st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
5096 #ifdef CONFIG_X86_64
5097         u32     xmm_space[64];  /* 16*16 bytes for each XMM-reg = 256 bytes */
5098 #else
5099         u32     xmm_space[32];  /* 8*16 bytes for each XMM-reg = 128 bytes */
5100 #endif
5101 };
5102
5103 /*
5104  * Translate a guest virtual address to a guest physical address.
5105  */
5106 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
5107                                     struct kvm_translation *tr)
5108 {
5109         unsigned long vaddr = tr->linear_address;
5110         gpa_t gpa;
5111         int idx;
5112
5113         vcpu_load(vcpu);
5114         idx = srcu_read_lock(&vcpu->kvm->srcu);
5115         gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL);
5116         srcu_read_unlock(&vcpu->kvm->srcu, idx);
5117         tr->physical_address = gpa;
5118         tr->valid = gpa != UNMAPPED_GVA;
5119         tr->writeable = 1;
5120         tr->usermode = 0;
5121         vcpu_put(vcpu);
5122
5123         return 0;
5124 }
5125
5126 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
5127 {
5128         struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
5129
5130         vcpu_load(vcpu);
5131
5132         memcpy(fpu->fpr, fxsave->st_space, 128);
5133         fpu->fcw = fxsave->cwd;
5134         fpu->fsw = fxsave->swd;
5135         fpu->ftwx = fxsave->twd;
5136         fpu->last_opcode = fxsave->fop;
5137         fpu->last_ip = fxsave->rip;
5138         fpu->last_dp = fxsave->rdp;
5139         memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
5140
5141         vcpu_put(vcpu);
5142
5143         return 0;
5144 }
5145
5146 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
5147 {
5148         struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
5149
5150         vcpu_load(vcpu);
5151
5152         memcpy(fxsave->st_space, fpu->fpr, 128);
5153         fxsave->cwd = fpu->fcw;
5154         fxsave->swd = fpu->fsw;
5155         fxsave->twd = fpu->ftwx;
5156         fxsave->fop = fpu->last_opcode;
5157         fxsave->rip = fpu->last_ip;
5158         fxsave->rdp = fpu->last_dp;
5159         memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
5160
5161         vcpu_put(vcpu);
5162
5163         return 0;
5164 }
5165
5166 void fx_init(struct kvm_vcpu *vcpu)
5167 {
5168         unsigned after_mxcsr_mask;
5169
5170         /*
5171          * Touch the fpu the first time in non atomic context as if
5172          * this is the first fpu instruction the exception handler
5173          * will fire before the instruction returns and it'll have to
5174          * allocate ram with GFP_KERNEL.
5175          */
5176         if (!used_math())
5177                 kvm_fx_save(&vcpu->arch.host_fx_image);
5178
5179         /* Initialize guest FPU by resetting ours and saving into guest's */
5180         preempt_disable();
5181         kvm_fx_save(&vcpu->arch.host_fx_image);
5182         kvm_fx_finit();
5183         kvm_fx_save(&vcpu->arch.guest_fx_image);
5184         kvm_fx_restore(&vcpu->arch.host_fx_image);
5185         preempt_enable();
5186
5187         vcpu->arch.cr0 |= X86_CR0_ET;
5188         after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
5189         vcpu->arch.guest_fx_image.mxcsr = 0x1f80;
5190         memset((void *)&vcpu->arch.guest_fx_image + after_mxcsr_mask,
5191                0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
5192 }
5193 EXPORT_SYMBOL_GPL(fx_init);
5194
5195 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
5196 {
5197         if (vcpu->guest_fpu_loaded)
5198                 return;
5199
5200         vcpu->guest_fpu_loaded = 1;
5201         kvm_fx_save(&vcpu->arch.host_fx_image);
5202         kvm_fx_restore(&vcpu->arch.guest_fx_image);
5203         trace_kvm_fpu(1);
5204 }
5205
5206 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
5207 {
5208         if (!vcpu->guest_fpu_loaded)
5209                 return;
5210
5211         vcpu->guest_fpu_loaded = 0;
5212         kvm_fx_save(&vcpu->arch.guest_fx_image);
5213         kvm_fx_restore(&vcpu->arch.host_fx_image);
5214         ++vcpu->stat.fpu_reload;
5215         set_bit(KVM_REQ_DEACTIVATE_FPU, &vcpu->requests);
5216         trace_kvm_fpu(0);
5217 }
5218
5219 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
5220 {
5221         if (vcpu->arch.time_page) {
5222                 kvm_release_page_dirty(vcpu->arch.time_page);
5223                 vcpu->arch.time_page = NULL;
5224         }
5225
5226         kvm_x86_ops->vcpu_free(vcpu);
5227 }
5228
5229 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
5230                                                 unsigned int id)
5231 {
5232         return kvm_x86_ops->vcpu_create(kvm, id);
5233 }
5234
5235 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
5236 {
5237         int r;
5238
5239         /* We do fxsave: this must be aligned. */
5240         BUG_ON((unsigned long)&vcpu->arch.host_fx_image & 0xF);
5241
5242         vcpu->arch.mtrr_state.have_fixed = 1;
5243         vcpu_load(vcpu);
5244         r = kvm_arch_vcpu_reset(vcpu);
5245         if (r == 0)
5246                 r = kvm_mmu_setup(vcpu);
5247         vcpu_put(vcpu);
5248         if (r < 0)
5249                 goto free_vcpu;
5250
5251         return 0;
5252 free_vcpu:
5253         kvm_x86_ops->vcpu_free(vcpu);
5254         return r;
5255 }
5256
5257 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
5258 {
5259         vcpu_load(vcpu);
5260         kvm_mmu_unload(vcpu);
5261         vcpu_put(vcpu);
5262
5263         kvm_x86_ops->vcpu_free(vcpu);
5264 }
5265
5266 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
5267 {
5268         vcpu->arch.nmi_pending = false;
5269         vcpu->arch.nmi_injected = false;
5270
5271         vcpu->arch.switch_db_regs = 0;
5272         memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
5273         vcpu->arch.dr6 = DR6_FIXED_1;
5274         vcpu->arch.dr7 = DR7_FIXED_1;
5275
5276         return kvm_x86_ops->vcpu_reset(vcpu);
5277 }
5278
5279 int kvm_arch_hardware_enable(void *garbage)
5280 {
5281         /*
5282          * Since this may be called from a hotplug notifcation,
5283          * we can't get the CPU frequency directly.
5284          */
5285         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
5286                 int cpu = raw_smp_processor_id();
5287                 per_cpu(cpu_tsc_khz, cpu) = 0;
5288         }
5289
5290         kvm_shared_msr_cpu_online();
5291
5292         return kvm_x86_ops->hardware_enable(garbage);
5293 }
5294
5295 void kvm_arch_hardware_disable(void *garbage)
5296 {
5297         kvm_x86_ops->hardware_disable(garbage);
5298         drop_user_return_notifiers(garbage);
5299 }
5300
5301 int kvm_arch_hardware_setup(void)
5302 {
5303         return kvm_x86_ops->hardware_setup();
5304 }
5305
5306 void kvm_arch_hardware_unsetup(void)
5307 {
5308         kvm_x86_ops->hardware_unsetup();
5309 }
5310
5311 void kvm_arch_check_processor_compat(void *rtn)
5312 {
5313         kvm_x86_ops->check_processor_compatibility(rtn);
5314 }
5315
5316 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
5317 {
5318         struct page *page;
5319         struct kvm *kvm;
5320         int r;
5321
5322         BUG_ON(vcpu->kvm == NULL);
5323         kvm = vcpu->kvm;
5324
5325         vcpu->arch.mmu.root_hpa = INVALID_PAGE;
5326         if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))
5327                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
5328         else
5329                 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
5330
5331         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
5332         if (!page) {
5333                 r = -ENOMEM;
5334                 goto fail;
5335         }
5336         vcpu->arch.pio_data = page_address(page);
5337
5338         r = kvm_mmu_create(vcpu);
5339         if (r < 0)
5340                 goto fail_free_pio_data;
5341
5342         if (irqchip_in_kernel(kvm)) {
5343                 r = kvm_create_lapic(vcpu);
5344                 if (r < 0)
5345                         goto fail_mmu_destroy;
5346         }
5347
5348         vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
5349                                        GFP_KERNEL);
5350         if (!vcpu->arch.mce_banks) {
5351                 r = -ENOMEM;
5352                 goto fail_free_lapic;
5353         }
5354         vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
5355
5356         return 0;
5357 fail_free_lapic:
5358         kvm_free_lapic(vcpu);
5359 fail_mmu_destroy:
5360         kvm_mmu_destroy(vcpu);
5361 fail_free_pio_data:
5362         free_page((unsigned long)vcpu->arch.pio_data);
5363 fail:
5364         return r;
5365 }
5366
5367 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
5368 {
5369         int idx;
5370
5371         kfree(vcpu->arch.mce_banks);
5372         kvm_free_lapic(vcpu);
5373         idx = srcu_read_lock(&vcpu->kvm->srcu);
5374         kvm_mmu_destroy(vcpu);
5375         srcu_read_unlock(&vcpu->kvm->srcu, idx);
5376         free_page((unsigned long)vcpu->arch.pio_data);
5377 }
5378
5379 struct  kvm *kvm_arch_create_vm(void)
5380 {
5381         struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
5382
5383         if (!kvm)
5384                 return ERR_PTR(-ENOMEM);
5385
5386         kvm->arch.aliases = kzalloc(sizeof(struct kvm_mem_aliases), GFP_KERNEL);
5387         if (!kvm->arch.aliases) {
5388                 kfree(kvm);
5389                 return ERR_PTR(-ENOMEM);
5390         }
5391
5392         INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
5393         INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
5394
5395         /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
5396         set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
5397
5398         rdtscll(kvm->arch.vm_init_tsc);
5399
5400         return kvm;
5401 }
5402
5403 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
5404 {
5405         vcpu_load(vcpu);
5406         kvm_mmu_unload(vcpu);
5407         vcpu_put(vcpu);
5408 }
5409
5410 static void kvm_free_vcpus(struct kvm *kvm)
5411 {
5412         unsigned int i;
5413         struct kvm_vcpu *vcpu;
5414
5415         /*
5416          * Unpin any mmu pages first.
5417          */
5418         kvm_for_each_vcpu(i, vcpu, kvm)
5419                 kvm_unload_vcpu_mmu(vcpu);
5420         kvm_for_each_vcpu(i, vcpu, kvm)
5421                 kvm_arch_vcpu_free(vcpu);
5422
5423         mutex_lock(&kvm->lock);
5424         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
5425                 kvm->vcpus[i] = NULL;
5426
5427         atomic_set(&kvm->online_vcpus, 0);
5428         mutex_unlock(&kvm->lock);
5429 }
5430
5431 void kvm_arch_sync_events(struct kvm *kvm)
5432 {
5433         kvm_free_all_assigned_devices(kvm);
5434 }
5435
5436 void kvm_arch_destroy_vm(struct kvm *kvm)
5437 {
5438         kvm_iommu_unmap_guest(kvm);
5439         kvm_free_pit(kvm);
5440         kfree(kvm->arch.vpic);
5441         kfree(kvm->arch.vioapic);
5442         kvm_free_vcpus(kvm);
5443         kvm_free_physmem(kvm);
5444         if (kvm->arch.apic_access_page)
5445                 put_page(kvm->arch.apic_access_page);
5446         if (kvm->arch.ept_identity_pagetable)
5447                 put_page(kvm->arch.ept_identity_pagetable);
5448         cleanup_srcu_struct(&kvm->srcu);
5449         kfree(kvm->arch.aliases);
5450         kfree(kvm);
5451 }
5452
5453 int kvm_arch_prepare_memory_region(struct kvm *kvm,
5454                                 struct kvm_memory_slot *memslot,
5455                                 struct kvm_memory_slot old,
5456                                 struct kvm_userspace_memory_region *mem,
5457                                 int user_alloc)
5458 {
5459         int npages = memslot->npages;
5460
5461         /*To keep backward compatibility with older userspace,
5462          *x86 needs to hanlde !user_alloc case.
5463          */
5464         if (!user_alloc) {
5465                 if (npages && !old.rmap) {
5466                         unsigned long userspace_addr;
5467
5468                         down_write(&current->mm->mmap_sem);
5469                         userspace_addr = do_mmap(NULL, 0,
5470                                                  npages * PAGE_SIZE,
5471                                                  PROT_READ | PROT_WRITE,
5472                                                  MAP_PRIVATE | MAP_ANONYMOUS,
5473                                                  0);
5474                         up_write(&current->mm->mmap_sem);
5475
5476                         if (IS_ERR((void *)userspace_addr))
5477                                 return PTR_ERR((void *)userspace_addr);
5478
5479                         memslot->userspace_addr = userspace_addr;
5480                 }
5481         }
5482
5483
5484         return 0;
5485 }
5486
5487 void kvm_arch_commit_memory_region(struct kvm *kvm,
5488                                 struct kvm_userspace_memory_region *mem,
5489                                 struct kvm_memory_slot old,
5490                                 int user_alloc)
5491 {
5492
5493         int npages = mem->memory_size >> PAGE_SHIFT;
5494
5495         if (!user_alloc && !old.user_alloc && old.rmap && !npages) {
5496                 int ret;
5497
5498                 down_write(&current->mm->mmap_sem);
5499                 ret = do_munmap(current->mm, old.userspace_addr,
5500                                 old.npages * PAGE_SIZE);
5501                 up_write(&current->mm->mmap_sem);
5502                 if (ret < 0)
5503                         printk(KERN_WARNING
5504                                "kvm_vm_ioctl_set_memory_region: "
5505                                "failed to munmap memory\n");
5506         }
5507
5508         spin_lock(&kvm->mmu_lock);
5509         if (!kvm->arch.n_requested_mmu_pages) {
5510                 unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
5511                 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
5512         }
5513
5514         kvm_mmu_slot_remove_write_access(kvm, mem->slot);
5515         spin_unlock(&kvm->mmu_lock);
5516 }
5517
5518 void kvm_arch_flush_shadow(struct kvm *kvm)
5519 {
5520         kvm_mmu_zap_all(kvm);
5521         kvm_reload_remote_mmus(kvm);
5522 }
5523
5524 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
5525 {
5526         return vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE
5527                 || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED
5528                 || vcpu->arch.nmi_pending ||
5529                 (kvm_arch_interrupt_allowed(vcpu) &&
5530                  kvm_cpu_has_interrupt(vcpu));
5531 }
5532
5533 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
5534 {
5535         int me;
5536         int cpu = vcpu->cpu;
5537
5538         if (waitqueue_active(&vcpu->wq)) {
5539                 wake_up_interruptible(&vcpu->wq);
5540                 ++vcpu->stat.halt_wakeup;
5541         }
5542
5543         me = get_cpu();
5544         if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
5545                 if (!test_and_set_bit(KVM_REQ_KICK, &vcpu->requests))
5546                         smp_send_reschedule(cpu);
5547         put_cpu();
5548 }
5549
5550 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
5551 {
5552         return kvm_x86_ops->interrupt_allowed(vcpu);
5553 }
5554
5555 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip)
5556 {
5557         unsigned long current_rip = kvm_rip_read(vcpu) +
5558                 get_segment_base(vcpu, VCPU_SREG_CS);
5559
5560         return current_rip == linear_rip;
5561 }
5562 EXPORT_SYMBOL_GPL(kvm_is_linear_rip);
5563
5564 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu)
5565 {
5566         unsigned long rflags;
5567
5568         rflags = kvm_x86_ops->get_rflags(vcpu);
5569         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
5570                 rflags &= ~X86_EFLAGS_TF;
5571         return rflags;
5572 }
5573 EXPORT_SYMBOL_GPL(kvm_get_rflags);
5574
5575 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
5576 {
5577         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP &&
5578             kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip))
5579                 rflags |= X86_EFLAGS_TF;
5580         kvm_x86_ops->set_rflags(vcpu, rflags);
5581 }
5582 EXPORT_SYMBOL_GPL(kvm_set_rflags);
5583
5584 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
5585 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
5586 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
5587 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
5588 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
5589 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
5590 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
5591 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
5592 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
5593 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
5594 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
5595 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);