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>
18 #define CR0_PE_MASK (1ULL << 0)
19 #define CR0_TS_MASK (1ULL << 3)
20 #define CR0_NE_MASK (1ULL << 5)
21 #define CR0_WP_MASK (1ULL << 16)
22 #define CR0_NW_MASK (1ULL << 29)
23 #define CR0_CD_MASK (1ULL << 30)
24 #define CR0_PG_MASK (1ULL << 31)
26 #define CR3_WPT_MASK (1ULL << 3)
27 #define CR3_PCD_MASK (1ULL << 4)
29 #define CR3_RESEVED_BITS 0x07ULL
30 #define CR3_L_MODE_RESEVED_BITS (~((1ULL << 40) - 1) | 0x0fe7ULL)
31 #define CR3_FLAGS_MASK ((1ULL << 5) - 1)
33 #define CR4_VME_MASK (1ULL << 0)
34 #define CR4_PSE_MASK (1ULL << 4)
35 #define CR4_PAE_MASK (1ULL << 5)
36 #define CR4_PGE_MASK (1ULL << 7)
37 #define CR4_VMXE_MASK (1ULL << 13)
39 #define KVM_GUEST_CR0_MASK \
40 (CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK \
41 | CR0_NW_MASK | CR0_CD_MASK)
42 #define KVM_VM_CR0_ALWAYS_ON \
43 (CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK)
44 #define KVM_GUEST_CR4_MASK \
45 (CR4_PSE_MASK | CR4_PAE_MASK | CR4_PGE_MASK | CR4_VMXE_MASK | CR4_VME_MASK)
46 #define KVM_PMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK)
47 #define KVM_RMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK | CR4_VME_MASK)
49 #define INVALID_PAGE (~(hpa_t)0)
50 #define UNMAPPED_GVA (~(gpa_t)0)
52 #define KVM_MAX_VCPUS 1
53 #define KVM_MEMORY_SLOTS 4
54 #define KVM_NUM_MMU_PAGES 256
56 #define FX_IMAGE_SIZE 512
57 #define FX_IMAGE_ALIGN 16
58 #define FX_BUF_SIZE (2 * FX_IMAGE_SIZE + FX_IMAGE_ALIGN)
68 #define SELECTOR_TI_MASK (1 << 2)
69 #define SELECTOR_RPL_MASK 0x03
76 * gva - guest virtual address
77 * gpa - guest physical address
78 * gfn - guest frame number
79 * hva - host virtual address
80 * hpa - host physical address
81 * hfn - host frame number
84 typedef unsigned long gva_t
;
86 typedef unsigned long gfn_t
;
88 typedef unsigned long hva_t
;
90 typedef unsigned long hfn_t
;
93 struct list_head link
;
95 unsigned long slot_bitmap
; /* One bit set per slot which has memory
96 * in this shadow page.
98 int global
; /* Set if all ptes in this page are global */
108 #define vmx_msr_entry kvm_msr_entry
113 * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
114 * 32-bit). The kvm_mmu structure abstracts the details of the current mmu
118 void (*new_cr3
)(struct kvm_vcpu
*vcpu
);
119 int (*page_fault
)(struct kvm_vcpu
*vcpu
, gva_t gva
, u32 err
);
120 void (*inval_page
)(struct kvm_vcpu
*vcpu
, gva_t gva
);
121 void (*free
)(struct kvm_vcpu
*vcpu
);
122 gpa_t (*gva_to_gpa
)(struct kvm_vcpu
*vcpu
, gva_t gva
);
125 int shadow_root_level
;
128 struct kvm_guest_debug
{
171 struct vcpu_svm
*svm
;
176 int interrupt_window_open
;
177 unsigned long irq_summary
; /* bit vector: 1 per word in irq_pending */
178 #define NR_IRQ_WORDS KVM_IRQ_BITMAP_SIZE(unsigned long)
179 unsigned long irq_pending
[NR_IRQ_WORDS
];
180 unsigned long regs
[NR_VCPU_REGS
]; /* for rsp: vcpu_load_rsp_rip() */
181 unsigned long rip
; /* needs vcpu_load_rsp_rip() */
191 struct vmx_msr_entry
*guest_msrs
;
192 struct vmx_msr_entry
*host_msrs
;
194 struct list_head free_pages
;
195 struct kvm_mmu_page page_header_buf
[KVM_NUM_MMU_PAGES
];
198 struct kvm_guest_debug guest_debug
;
200 char fx_buf
[FX_BUF_SIZE
];
202 char *guest_fx_image
;
205 int mmio_read_completed
;
208 unsigned char mmio_data
[8];
209 gpa_t mmio_phys_addr
;
214 struct kvm_save_segment
{
219 } tr
, es
, ds
, fs
, gs
;
223 struct kvm_memory_slot
{
225 unsigned long npages
;
227 struct page
**phys_mem
;
228 unsigned long *dirty_bitmap
;
232 spinlock_t lock
; /* protects everything except vcpus */
234 struct kvm_memory_slot memslots
[KVM_MEMORY_SLOTS
];
235 struct list_head active_mmu_pages
;
236 struct kvm_vcpu vcpus
[KVM_MAX_VCPUS
];
237 int memory_config_version
;
251 u32 irq_window_exits
;
253 u32 request_irq_exits
;
257 struct descriptor_table
{
260 } __attribute__((packed
));
262 struct kvm_arch_ops
{
263 int (*cpu_has_kvm_support
)(void); /* __init */
264 int (*disabled_by_bios
)(void); /* __init */
265 void (*hardware_enable
)(void *dummy
); /* __init */
266 void (*hardware_disable
)(void *dummy
);
267 int (*hardware_setup
)(void); /* __init */
268 void (*hardware_unsetup
)(void); /* __exit */
270 int (*vcpu_create
)(struct kvm_vcpu
*vcpu
);
271 void (*vcpu_free
)(struct kvm_vcpu
*vcpu
);
273 struct kvm_vcpu
*(*vcpu_load
)(struct kvm_vcpu
*vcpu
);
274 void (*vcpu_put
)(struct kvm_vcpu
*vcpu
);
276 int (*set_guest_debug
)(struct kvm_vcpu
*vcpu
,
277 struct kvm_debug_guest
*dbg
);
278 int (*get_msr
)(struct kvm_vcpu
*vcpu
, u32 msr_index
, u64
*pdata
);
279 int (*set_msr
)(struct kvm_vcpu
*vcpu
, u32 msr_index
, u64 data
);
280 u64 (*get_segment_base
)(struct kvm_vcpu
*vcpu
, int seg
);
281 void (*get_segment
)(struct kvm_vcpu
*vcpu
,
282 struct kvm_segment
*var
, int seg
);
283 void (*set_segment
)(struct kvm_vcpu
*vcpu
,
284 struct kvm_segment
*var
, int seg
);
285 void (*get_cs_db_l_bits
)(struct kvm_vcpu
*vcpu
, int *db
, int *l
);
286 void (*decache_cr0_cr4_guest_bits
)(struct kvm_vcpu
*vcpu
);
287 void (*set_cr0
)(struct kvm_vcpu
*vcpu
, unsigned long cr0
);
288 void (*set_cr0_no_modeswitch
)(struct kvm_vcpu
*vcpu
,
290 void (*set_cr3
)(struct kvm_vcpu
*vcpu
, unsigned long cr3
);
291 void (*set_cr4
)(struct kvm_vcpu
*vcpu
, unsigned long cr4
);
292 void (*set_efer
)(struct kvm_vcpu
*vcpu
, u64 efer
);
293 void (*get_idt
)(struct kvm_vcpu
*vcpu
, struct descriptor_table
*dt
);
294 void (*set_idt
)(struct kvm_vcpu
*vcpu
, struct descriptor_table
*dt
);
295 void (*get_gdt
)(struct kvm_vcpu
*vcpu
, struct descriptor_table
*dt
);
296 void (*set_gdt
)(struct kvm_vcpu
*vcpu
, struct descriptor_table
*dt
);
297 unsigned long (*get_dr
)(struct kvm_vcpu
*vcpu
, int dr
);
298 void (*set_dr
)(struct kvm_vcpu
*vcpu
, int dr
, unsigned long value
,
300 void (*cache_regs
)(struct kvm_vcpu
*vcpu
);
301 void (*decache_regs
)(struct kvm_vcpu
*vcpu
);
302 unsigned long (*get_rflags
)(struct kvm_vcpu
*vcpu
);
303 void (*set_rflags
)(struct kvm_vcpu
*vcpu
, unsigned long rflags
);
305 void (*invlpg
)(struct kvm_vcpu
*vcpu
, gva_t addr
);
306 void (*tlb_flush
)(struct kvm_vcpu
*vcpu
);
307 void (*inject_page_fault
)(struct kvm_vcpu
*vcpu
,
308 unsigned long addr
, u32 err_code
);
310 void (*inject_gp
)(struct kvm_vcpu
*vcpu
, unsigned err_code
);
312 int (*run
)(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
);
313 int (*vcpu_setup
)(struct kvm_vcpu
*vcpu
);
314 void (*skip_emulated_instruction
)(struct kvm_vcpu
*vcpu
);
317 extern struct kvm_stat kvm_stat
;
318 extern struct kvm_arch_ops
*kvm_arch_ops
;
320 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
321 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
323 int kvm_init_arch(struct kvm_arch_ops
*ops
, struct module
*module
);
324 void kvm_exit_arch(void);
326 void kvm_mmu_destroy(struct kvm_vcpu
*vcpu
);
327 int kvm_mmu_create(struct kvm_vcpu
*vcpu
);
328 int kvm_mmu_setup(struct kvm_vcpu
*vcpu
);
330 int kvm_mmu_reset_context(struct kvm_vcpu
*vcpu
);
331 void kvm_mmu_slot_remove_write_access(struct kvm
*kvm
, int slot
);
333 hpa_t
gpa_to_hpa(struct kvm_vcpu
*vcpu
, gpa_t gpa
);
334 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
335 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
336 static inline int is_error_hpa(hpa_t hpa
) { return hpa
>> HPA_MSB
; }
337 hpa_t
gva_to_hpa(struct kvm_vcpu
*vcpu
, gva_t gva
);
339 void kvm_emulator_want_group7_invlpg(void);
341 extern hpa_t bad_page_address
;
343 static inline struct page
*gfn_to_page(struct kvm_memory_slot
*slot
, gfn_t gfn
)
345 return slot
->phys_mem
[gfn
- slot
->base_gfn
];
348 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
);
349 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
);
351 enum emulation_result
{
352 EMULATE_DONE
, /* no further processing */
353 EMULATE_DO_MMIO
, /* kvm_run filled with mmio request */
354 EMULATE_FAIL
, /* can't emulate this instruction */
357 int emulate_instruction(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
,
358 unsigned long cr2
, u16 error_code
);
359 void realmode_lgdt(struct kvm_vcpu
*vcpu
, u16 size
, unsigned long address
);
360 void realmode_lidt(struct kvm_vcpu
*vcpu
, u16 size
, unsigned long address
);
361 void realmode_lmsw(struct kvm_vcpu
*vcpu
, unsigned long msw
,
362 unsigned long *rflags
);
364 unsigned long realmode_get_cr(struct kvm_vcpu
*vcpu
, int cr
);
365 void realmode_set_cr(struct kvm_vcpu
*vcpu
, int cr
, unsigned long value
,
366 unsigned long *rflags
);
368 struct x86_emulate_ctxt
;
370 int emulate_invlpg(struct kvm_vcpu
*vcpu
, gva_t address
);
371 int emulate_clts(struct kvm_vcpu
*vcpu
);
372 int emulator_get_dr(struct x86_emulate_ctxt
* ctxt
, int dr
,
373 unsigned long *dest
);
374 int emulator_set_dr(struct x86_emulate_ctxt
*ctxt
, int dr
,
375 unsigned long value
);
377 void set_cr0(struct kvm_vcpu
*vcpu
, unsigned long cr0
);
378 void set_cr3(struct kvm_vcpu
*vcpu
, unsigned long cr0
);
379 void set_cr4(struct kvm_vcpu
*vcpu
, unsigned long cr0
);
380 void set_cr8(struct kvm_vcpu
*vcpu
, unsigned long cr0
);
381 void lmsw(struct kvm_vcpu
*vcpu
, unsigned long msw
);
383 int kvm_get_msr_common(struct kvm_vcpu
*vcpu
, u32 msr
, u64
*pdata
);
384 int kvm_set_msr_common(struct kvm_vcpu
*vcpu
, u32 msr
, u64 data
);
386 void fx_init(struct kvm_vcpu
*vcpu
);
388 void load_msrs(struct vmx_msr_entry
*e
, int n
);
389 void save_msrs(struct vmx_msr_entry
*e
, int n
);
390 void kvm_resched(struct kvm_vcpu
*vcpu
);
392 int kvm_read_guest(struct kvm_vcpu
*vcpu
,
397 int kvm_write_guest(struct kvm_vcpu
*vcpu
,
402 unsigned long segment_base(u16 selector
);
404 static inline struct page
*_gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
406 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
407 return (slot
) ? slot
->phys_mem
[gfn
- slot
->base_gfn
] : NULL
;
410 static inline int is_long_mode(struct kvm_vcpu
*vcpu
)
413 return vcpu
->shadow_efer
& EFER_LME
;
419 static inline int is_pae(struct kvm_vcpu
*vcpu
)
421 return vcpu
->cr4
& CR4_PAE_MASK
;
424 static inline int is_pse(struct kvm_vcpu
*vcpu
)
426 return vcpu
->cr4
& CR4_PSE_MASK
;
429 static inline int is_paging(struct kvm_vcpu
*vcpu
)
431 return vcpu
->cr0
& CR0_PG_MASK
;
434 static inline int memslot_id(struct kvm
*kvm
, struct kvm_memory_slot
*slot
)
436 return slot
- kvm
->memslots
;
439 static inline struct kvm_mmu_page
*page_header(hpa_t shadow_page
)
441 struct page
*page
= pfn_to_page(shadow_page
>> PAGE_SHIFT
);
443 return (struct kvm_mmu_page
*)page
->private;
446 static inline u16
read_fs(void)
449 asm ("mov %%fs, %0" : "=g"(seg
));
453 static inline u16
read_gs(void)
456 asm ("mov %%gs, %0" : "=g"(seg
));
460 static inline u16
read_ldt(void)
463 asm ("sldt %0" : "=g"(ldt
));
467 static inline void load_fs(u16 sel
)
469 asm ("mov %0, %%fs" : : "rm"(sel
));
472 static inline void load_gs(u16 sel
)
474 asm ("mov %0, %%gs" : : "rm"(sel
));
478 static inline void load_ldt(u16 sel
)
480 asm ("lldt %0" : : "g"(sel
));
484 static inline void get_idt(struct descriptor_table
*table
)
486 asm ("sidt %0" : "=m"(*table
));
489 static inline void get_gdt(struct descriptor_table
*table
)
491 asm ("sgdt %0" : "=m"(*table
));
494 static inline unsigned long read_tr_base(void)
497 asm ("str %0" : "=g"(tr
));
498 return segment_base(tr
);
502 static inline unsigned long read_msr(unsigned long msr
)
511 static inline void fx_save(void *image
)
513 asm ("fxsave (%0)":: "r" (image
));
516 static inline void fx_restore(void *image
)
518 asm ("fxrstor (%0)":: "r" (image
));
521 static inline void fpu_init(void)
526 static inline u32
get_rdx_init_val(void)
528 return 0x600; /* P6 family */
531 #define ASM_VMX_VMCLEAR_RAX ".byte 0x66, 0x0f, 0xc7, 0x30"
532 #define ASM_VMX_VMLAUNCH ".byte 0x0f, 0x01, 0xc2"
533 #define ASM_VMX_VMRESUME ".byte 0x0f, 0x01, 0xc3"
534 #define ASM_VMX_VMPTRLD_RAX ".byte 0x0f, 0xc7, 0x30"
535 #define ASM_VMX_VMREAD_RDX_RAX ".byte 0x0f, 0x78, 0xd0"
536 #define ASM_VMX_VMWRITE_RAX_RDX ".byte 0x0f, 0x79, 0xd0"
537 #define ASM_VMX_VMWRITE_RSP_RDX ".byte 0x0f, 0x79, 0xd4"
538 #define ASM_VMX_VMXOFF ".byte 0x0f, 0x01, 0xc4"
539 #define ASM_VMX_VMXON_RAX ".byte 0xf3, 0x0f, 0xc7, 0x30"
541 #define MSR_IA32_TIME_STAMP_COUNTER 0x010
543 #define TSS_IOPB_BASE_OFFSET 0x66
544 #define TSS_BASE_SIZE 0x68
545 #define TSS_IOPB_SIZE (65536 / 8)
546 #define TSS_REDIRECTION_SIZE (256 / 8)
547 #define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
552 * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64. Therefore
553 * we need to allocate shadow page tables in the first 4GB of memory, which
554 * happens to fit the DMA32 zone.
556 #define GFP_KVM_MMU (GFP_KERNEL | __GFP_DMA32)
560 #define GFP_KVM_MMU GFP_KERNEL