5 * This work is licensed under the terms of the GNU GPL, version 2. See
6 * the COPYING file in the top-level directory.
9 #include <linux/types.h>
10 #include <linux/list.h>
11 #include <linux/mutex.h>
12 #include <linux/spinlock.h>
16 #include <linux/kvm.h>
17 #include <linux/kvm_para.h>
19 #define CR0_PE_MASK (1ULL << 0)
20 #define CR0_TS_MASK (1ULL << 3)
21 #define CR0_NE_MASK (1ULL << 5)
22 #define CR0_WP_MASK (1ULL << 16)
23 #define CR0_NW_MASK (1ULL << 29)
24 #define CR0_CD_MASK (1ULL << 30)
25 #define CR0_PG_MASK (1ULL << 31)
27 #define CR3_WPT_MASK (1ULL << 3)
28 #define CR3_PCD_MASK (1ULL << 4)
30 #define CR3_RESEVED_BITS 0x07ULL
31 #define CR3_L_MODE_RESEVED_BITS (~((1ULL << 40) - 1) | 0x0fe7ULL)
32 #define CR3_FLAGS_MASK ((1ULL << 5) - 1)
34 #define CR4_VME_MASK (1ULL << 0)
35 #define CR4_PSE_MASK (1ULL << 4)
36 #define CR4_PAE_MASK (1ULL << 5)
37 #define CR4_PGE_MASK (1ULL << 7)
38 #define CR4_VMXE_MASK (1ULL << 13)
40 #define KVM_GUEST_CR0_MASK \
41 (CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK \
42 | CR0_NW_MASK | CR0_CD_MASK)
43 #define KVM_VM_CR0_ALWAYS_ON \
44 (CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK)
45 #define KVM_GUEST_CR4_MASK \
46 (CR4_PSE_MASK | CR4_PAE_MASK | CR4_PGE_MASK | CR4_VMXE_MASK | CR4_VME_MASK)
47 #define KVM_PMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK)
48 #define KVM_RMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK | CR4_VME_MASK)
50 #define INVALID_PAGE (~(hpa_t)0)
51 #define UNMAPPED_GVA (~(gpa_t)0)
53 #define KVM_MAX_VCPUS 1
54 #define KVM_ALIAS_SLOTS 4
55 #define KVM_MEMORY_SLOTS 4
56 #define KVM_NUM_MMU_PAGES 256
57 #define KVM_MIN_FREE_MMU_PAGES 5
58 #define KVM_REFILL_PAGES 25
59 #define KVM_MAX_CPUID_ENTRIES 40
61 #define FX_IMAGE_SIZE 512
62 #define FX_IMAGE_ALIGN 16
63 #define FX_BUF_SIZE (2 * FX_IMAGE_SIZE + FX_IMAGE_ALIGN)
73 #define SELECTOR_TI_MASK (1 << 2)
74 #define SELECTOR_RPL_MASK 0x03
78 #define KVM_PIO_PAGE_OFFSET 1
83 * gva - guest virtual address
84 * gpa - guest physical address
85 * gfn - guest frame number
86 * hva - host virtual address
87 * hpa - host physical address
88 * hfn - host frame number
91 typedef unsigned long gva_t;
93 typedef unsigned long gfn_t;
95 typedef unsigned long hva_t;
97 typedef unsigned long hfn_t;
99 #define NR_PTE_CHAIN_ENTRIES 5
101 struct kvm_pte_chain {
102 u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
103 struct hlist_node link;
107 * kvm_mmu_page_role, below, is defined as:
109 * bits 0:3 - total guest paging levels (2-4, or zero for real mode)
110 * bits 4:7 - page table level for this shadow (1-4)
111 * bits 8:9 - page table quadrant for 2-level guests
112 * bit 16 - "metaphysical" - gfn is not a real page (huge page/real mode)
113 * bits 17:18 - "access" - the user and writable bits of a huge page pde
115 union kvm_mmu_page_role {
118 unsigned glevels : 4;
120 unsigned quadrant : 2;
121 unsigned pad_for_nice_hex_output : 6;
122 unsigned metaphysical : 1;
123 unsigned hugepage_access : 2;
127 struct kvm_mmu_page {
128 struct list_head link;
129 struct hlist_node hash_link;
132 * The following two entries are used to key the shadow page in the
136 union kvm_mmu_page_role role;
139 unsigned long slot_bitmap; /* One bit set per slot which has memory
140 * in this shadow page.
142 int multimapped; /* More than one parent_pte? */
143 int root_count; /* Currently serving as active root */
145 u64 *parent_pte; /* !multimapped */
146 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
156 #define vmx_msr_entry kvm_msr_entry
161 * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
162 * 32-bit). The kvm_mmu structure abstracts the details of the current mmu
166 void (*new_cr3)(struct kvm_vcpu *vcpu);
167 int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
168 void (*free)(struct kvm_vcpu *vcpu);
169 gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
172 int shadow_root_level;
177 #define KVM_NR_MEM_OBJS 20
179 struct kvm_mmu_memory_cache {
181 void *objects[KVM_NR_MEM_OBJS];
185 * We don't want allocation failures within the mmu code, so we preallocate
186 * enough memory for a single page fault in a cache.
188 struct kvm_guest_debug {
227 struct kvm_pio_request {
230 struct page *guest_pages[2];
231 unsigned guest_page_offset;
249 u32 irq_window_exits;
251 u32 request_irq_exits;
259 struct vcpu_svm *svm;
266 int interrupt_window_open;
267 unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
268 #define NR_IRQ_WORDS KVM_IRQ_BITMAP_SIZE(unsigned long)
269 unsigned long irq_pending[NR_IRQ_WORDS];
270 unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
271 unsigned long rip; /* needs vcpu_load_rsp_rip() */
276 gpa_t para_state_gpa;
277 struct page *para_state_page;
281 u64 pdptrs[4]; /* pae */
284 u64 ia32_misc_enable_msr;
286 struct vmx_msr_entry *guest_msrs;
287 struct vmx_msr_entry *host_msrs;
289 struct list_head free_pages;
290 struct kvm_mmu_page page_header_buf[KVM_NUM_MMU_PAGES];
293 struct kvm_mmu_memory_cache mmu_pte_chain_cache;
294 struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
296 gfn_t last_pt_write_gfn;
297 int last_pt_write_count;
299 struct kvm_guest_debug guest_debug;
301 char fx_buf[FX_BUF_SIZE];
303 char *guest_fx_image;
306 int mmio_read_completed;
309 unsigned char mmio_data[8];
310 gpa_t mmio_phys_addr;
311 struct kvm_pio_request pio;
317 struct kvm_stat stat;
322 struct kvm_save_segment {
327 } tr, es, ds, fs, gs;
331 struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];
334 struct kvm_mem_alias {
336 unsigned long npages;
340 struct kvm_memory_slot {
342 unsigned long npages;
344 struct page **phys_mem;
345 unsigned long *dirty_bitmap;
349 spinlock_t lock; /* protects everything except vcpus */
351 struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
353 struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
355 * Hash table of struct kvm_mmu_page.
357 struct list_head active_mmu_pages;
358 int n_free_mmu_pages;
359 struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
360 struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
361 int memory_config_version;
363 unsigned long rmap_overflow;
364 struct list_head vm_list;
368 struct descriptor_table {
371 } __attribute__((packed));
373 struct kvm_arch_ops {
374 int (*cpu_has_kvm_support)(void); /* __init */
375 int (*disabled_by_bios)(void); /* __init */
376 void (*hardware_enable)(void *dummy); /* __init */
377 void (*hardware_disable)(void *dummy);
378 int (*hardware_setup)(void); /* __init */
379 void (*hardware_unsetup)(void); /* __exit */
381 int (*vcpu_create)(struct kvm_vcpu *vcpu);
382 void (*vcpu_free)(struct kvm_vcpu *vcpu);
384 void (*vcpu_load)(struct kvm_vcpu *vcpu);
385 void (*vcpu_put)(struct kvm_vcpu *vcpu);
386 void (*vcpu_decache)(struct kvm_vcpu *vcpu);
388 int (*set_guest_debug)(struct kvm_vcpu *vcpu,
389 struct kvm_debug_guest *dbg);
390 int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
391 int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
392 u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
393 void (*get_segment)(struct kvm_vcpu *vcpu,
394 struct kvm_segment *var, int seg);
395 void (*set_segment)(struct kvm_vcpu *vcpu,
396 struct kvm_segment *var, int seg);
397 void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
398 void (*decache_cr0_cr4_guest_bits)(struct kvm_vcpu *vcpu);
399 void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
400 void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
401 void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
402 void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
403 void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
404 void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
405 void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
406 void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
407 unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
408 void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
410 void (*cache_regs)(struct kvm_vcpu *vcpu);
411 void (*decache_regs)(struct kvm_vcpu *vcpu);
412 unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
413 void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
415 void (*invlpg)(struct kvm_vcpu *vcpu, gva_t addr);
416 void (*tlb_flush)(struct kvm_vcpu *vcpu);
417 void (*inject_page_fault)(struct kvm_vcpu *vcpu,
418 unsigned long addr, u32 err_code);
420 void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);
422 int (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
423 int (*vcpu_setup)(struct kvm_vcpu *vcpu);
424 void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
425 void (*patch_hypercall)(struct kvm_vcpu *vcpu,
426 unsigned char *hypercall_addr);
429 extern struct kvm_arch_ops *kvm_arch_ops;
431 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
432 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
434 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module);
435 void kvm_exit_arch(void);
437 int kvm_mmu_module_init(void);
438 void kvm_mmu_module_exit(void);
440 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
441 int kvm_mmu_create(struct kvm_vcpu *vcpu);
442 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
444 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
445 void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot);
446 void kvm_mmu_zap_all(struct kvm_vcpu *vcpu);
448 hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
449 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
450 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
451 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
452 hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
453 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
455 void kvm_emulator_want_group7_invlpg(void);
457 extern hpa_t bad_page_address;
459 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
460 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
461 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
463 enum emulation_result {
464 EMULATE_DONE, /* no further processing */
465 EMULATE_DO_MMIO, /* kvm_run filled with mmio request */
466 EMULATE_FAIL, /* can't emulate this instruction */
469 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
470 unsigned long cr2, u16 error_code);
471 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
472 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
473 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
474 unsigned long *rflags);
476 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
477 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
478 unsigned long *rflags);
480 struct x86_emulate_ctxt;
482 int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
483 int size, unsigned long count, int string, int down,
484 gva_t address, int rep, unsigned port);
485 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
486 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
487 int emulate_clts(struct kvm_vcpu *vcpu);
488 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
489 unsigned long *dest);
490 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
491 unsigned long value);
493 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
494 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
495 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
496 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
497 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
499 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
500 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
502 void fx_init(struct kvm_vcpu *vcpu);
504 void load_msrs(struct vmx_msr_entry *e, int n);
505 void save_msrs(struct vmx_msr_entry *e, int n);
506 void kvm_resched(struct kvm_vcpu *vcpu);
508 int kvm_read_guest(struct kvm_vcpu *vcpu,
513 int kvm_write_guest(struct kvm_vcpu *vcpu,
518 unsigned long segment_base(u16 selector);
520 void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
521 void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
522 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
523 void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
525 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run);
527 static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
530 if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
531 kvm_mmu_free_some_pages(vcpu);
532 return vcpu->mmu.page_fault(vcpu, gva, error_code);
535 static inline int is_long_mode(struct kvm_vcpu *vcpu)
538 return vcpu->shadow_efer & EFER_LME;
544 static inline int is_pae(struct kvm_vcpu *vcpu)
546 return vcpu->cr4 & CR4_PAE_MASK;
549 static inline int is_pse(struct kvm_vcpu *vcpu)
551 return vcpu->cr4 & CR4_PSE_MASK;
554 static inline int is_paging(struct kvm_vcpu *vcpu)
556 return vcpu->cr0 & CR0_PG_MASK;
559 static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
561 return slot - kvm->memslots;
564 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
566 struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
568 return (struct kvm_mmu_page *)page_private(page);
571 static inline u16 read_fs(void)
574 asm ("mov %%fs, %0" : "=g"(seg));
578 static inline u16 read_gs(void)
581 asm ("mov %%gs, %0" : "=g"(seg));
585 static inline u16 read_ldt(void)
588 asm ("sldt %0" : "=g"(ldt));
592 static inline void load_fs(u16 sel)
594 asm ("mov %0, %%fs" : : "rm"(sel));
597 static inline void load_gs(u16 sel)
599 asm ("mov %0, %%gs" : : "rm"(sel));
603 static inline void load_ldt(u16 sel)
605 asm ("lldt %0" : : "rm"(sel));
609 static inline void get_idt(struct descriptor_table *table)
611 asm ("sidt %0" : "=m"(*table));
614 static inline void get_gdt(struct descriptor_table *table)
616 asm ("sgdt %0" : "=m"(*table));
619 static inline unsigned long read_tr_base(void)
622 asm ("str %0" : "=g"(tr));
623 return segment_base(tr);
627 static inline unsigned long read_msr(unsigned long msr)
636 static inline void fx_save(void *image)
638 asm ("fxsave (%0)":: "r" (image));
641 static inline void fx_restore(void *image)
643 asm ("fxrstor (%0)":: "r" (image));
646 static inline void fpu_init(void)
651 static inline u32 get_rdx_init_val(void)
653 return 0x600; /* P6 family */
656 #define ASM_VMX_VMCLEAR_RAX ".byte 0x66, 0x0f, 0xc7, 0x30"
657 #define ASM_VMX_VMLAUNCH ".byte 0x0f, 0x01, 0xc2"
658 #define ASM_VMX_VMRESUME ".byte 0x0f, 0x01, 0xc3"
659 #define ASM_VMX_VMPTRLD_RAX ".byte 0x0f, 0xc7, 0x30"
660 #define ASM_VMX_VMREAD_RDX_RAX ".byte 0x0f, 0x78, 0xd0"
661 #define ASM_VMX_VMWRITE_RAX_RDX ".byte 0x0f, 0x79, 0xd0"
662 #define ASM_VMX_VMWRITE_RSP_RDX ".byte 0x0f, 0x79, 0xd4"
663 #define ASM_VMX_VMXOFF ".byte 0x0f, 0x01, 0xc4"
664 #define ASM_VMX_VMXON_RAX ".byte 0xf3, 0x0f, 0xc7, 0x30"
666 #define MSR_IA32_TIME_STAMP_COUNTER 0x010
668 #define TSS_IOPB_BASE_OFFSET 0x66
669 #define TSS_BASE_SIZE 0x68
670 #define TSS_IOPB_SIZE (65536 / 8)
671 #define TSS_REDIRECTION_SIZE (256 / 8)
672 #define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)