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>
13 #include <linux/signal.h>
14 #include <linux/sched.h>
16 #include <asm/signal.h>
19 #include <linux/kvm.h>
20 #include <linux/kvm_para.h>
22 #define CR0_PE_MASK (1ULL << 0)
23 #define CR0_MP_MASK (1ULL << 1)
24 #define CR0_TS_MASK (1ULL << 3)
25 #define CR0_NE_MASK (1ULL << 5)
26 #define CR0_WP_MASK (1ULL << 16)
27 #define CR0_NW_MASK (1ULL << 29)
28 #define CR0_CD_MASK (1ULL << 30)
29 #define CR0_PG_MASK (1ULL << 31)
31 #define CR3_WPT_MASK (1ULL << 3)
32 #define CR3_PCD_MASK (1ULL << 4)
34 #define CR3_RESEVED_BITS 0x07ULL
35 #define CR3_L_MODE_RESEVED_BITS (~((1ULL << 40) - 1) | 0x0fe7ULL)
36 #define CR3_FLAGS_MASK ((1ULL << 5) - 1)
38 #define CR4_VME_MASK (1ULL << 0)
39 #define CR4_PSE_MASK (1ULL << 4)
40 #define CR4_PAE_MASK (1ULL << 5)
41 #define CR4_PGE_MASK (1ULL << 7)
42 #define CR4_VMXE_MASK (1ULL << 13)
44 #define KVM_GUEST_CR0_MASK \
45 (CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK \
46 | CR0_NW_MASK | CR0_CD_MASK)
47 #define KVM_VM_CR0_ALWAYS_ON \
48 (CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK | CR0_TS_MASK \
50 #define KVM_GUEST_CR4_MASK \
51 (CR4_PSE_MASK | CR4_PAE_MASK | CR4_PGE_MASK | CR4_VMXE_MASK | CR4_VME_MASK)
52 #define KVM_PMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK)
53 #define KVM_RMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK | CR4_VME_MASK)
55 #define INVALID_PAGE (~(hpa_t)0)
56 #define UNMAPPED_GVA (~(gpa_t)0)
58 #define KVM_MAX_VCPUS 4
59 #define KVM_ALIAS_SLOTS 4
60 #define KVM_MEMORY_SLOTS 4
61 #define KVM_NUM_MMU_PAGES 1024
62 #define KVM_MIN_FREE_MMU_PAGES 5
63 #define KVM_REFILL_PAGES 25
64 #define KVM_MAX_CPUID_ENTRIES 40
66 #define FX_IMAGE_SIZE 512
67 #define FX_IMAGE_ALIGN 16
68 #define FX_BUF_SIZE (2 * FX_IMAGE_SIZE + FX_IMAGE_ALIGN)
79 #define SELECTOR_TI_MASK (1 << 2)
80 #define SELECTOR_RPL_MASK 0x03
84 #define KVM_PIO_PAGE_OFFSET 1
87 * vcpu->requests bit members
89 #define KVM_TLB_FLUSH 0
94 * gva - guest virtual address
95 * gpa - guest physical address
96 * gfn - guest frame number
97 * hva - host virtual address
98 * hpa - host physical address
99 * hfn - host frame number
102 typedef unsigned long gva_t;
104 typedef unsigned long gfn_t;
106 typedef unsigned long hva_t;
108 typedef unsigned long hfn_t;
110 #define NR_PTE_CHAIN_ENTRIES 5
112 struct kvm_pte_chain {
113 u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
114 struct hlist_node link;
118 * kvm_mmu_page_role, below, is defined as:
120 * bits 0:3 - total guest paging levels (2-4, or zero for real mode)
121 * bits 4:7 - page table level for this shadow (1-4)
122 * bits 8:9 - page table quadrant for 2-level guests
123 * bit 16 - "metaphysical" - gfn is not a real page (huge page/real mode)
124 * bits 17:19 - "access" - the user, writable, and nx bits of a huge page pde
126 union kvm_mmu_page_role {
129 unsigned glevels : 4;
131 unsigned quadrant : 2;
132 unsigned pad_for_nice_hex_output : 6;
133 unsigned metaphysical : 1;
134 unsigned hugepage_access : 3;
138 struct kvm_mmu_page {
139 struct list_head link;
140 struct hlist_node hash_link;
143 * The following two entries are used to key the shadow page in the
147 union kvm_mmu_page_role role;
150 unsigned long slot_bitmap; /* One bit set per slot which has memory
151 * in this shadow page.
153 int multimapped; /* More than one parent_pte? */
154 int root_count; /* Currently serving as active root */
156 u64 *parent_pte; /* !multimapped */
157 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
167 #define vmx_msr_entry kvm_msr_entry
172 * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
173 * 32-bit). The kvm_mmu structure abstracts the details of the current mmu
177 void (*new_cr3)(struct kvm_vcpu *vcpu);
178 int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
179 void (*free)(struct kvm_vcpu *vcpu);
180 gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
183 int shadow_root_level;
188 #define KVM_NR_MEM_OBJS 20
190 struct kvm_mmu_memory_cache {
192 void *objects[KVM_NR_MEM_OBJS];
196 * We don't want allocation failures within the mmu code, so we preallocate
197 * enough memory for a single page fault in a cache.
199 struct kvm_guest_debug {
238 struct kvm_pio_request {
241 struct page *guest_pages[2];
242 unsigned guest_page_offset;
261 u32 irq_window_exits;
263 u32 request_irq_exits;
269 struct kvm_io_device {
270 void (*read)(struct kvm_io_device *this,
274 void (*write)(struct kvm_io_device *this,
278 int (*in_range)(struct kvm_io_device *this, gpa_t addr);
279 void (*destructor)(struct kvm_io_device *this);
284 static inline void kvm_iodevice_read(struct kvm_io_device *dev,
289 dev->read(dev, addr, len, val);
292 static inline void kvm_iodevice_write(struct kvm_io_device *dev,
297 dev->write(dev, addr, len, val);
300 static inline int kvm_iodevice_inrange(struct kvm_io_device *dev, gpa_t addr)
302 return dev->in_range(dev, addr);
305 static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
308 dev->destructor(dev);
312 * It would be nice to use something smarter than a linear search, TBD...
313 * Thankfully we dont expect many devices to register (famous last words :),
314 * so until then it will suffice. At least its abstracted so we can change
319 #define NR_IOBUS_DEVS 6
320 struct kvm_io_device *devs[NR_IOBUS_DEVS];
323 void kvm_io_bus_init(struct kvm_io_bus *bus);
324 void kvm_io_bus_destroy(struct kvm_io_bus *bus);
325 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr);
326 void kvm_io_bus_register_dev(struct kvm_io_bus *bus,
327 struct kvm_io_device *dev);
334 struct vcpu_svm *svm;
341 int interrupt_window_open;
343 unsigned long requests;
344 unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
345 #define NR_IRQ_WORDS KVM_IRQ_BITMAP_SIZE(unsigned long)
346 unsigned long irq_pending[NR_IRQ_WORDS];
347 unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
348 unsigned long rip; /* needs vcpu_load_rsp_rip() */
353 gpa_t para_state_gpa;
354 struct page *para_state_page;
358 u64 pdptrs[4]; /* pae */
361 u64 ia32_misc_enable_msr;
366 int msr_offset_kernel_gs_base;
368 struct vmx_msr_entry *guest_msrs;
369 struct vmx_msr_entry *host_msrs;
373 struct kvm_mmu_memory_cache mmu_pte_chain_cache;
374 struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
375 struct kvm_mmu_memory_cache mmu_page_cache;
376 struct kvm_mmu_memory_cache mmu_page_header_cache;
378 gfn_t last_pt_write_gfn;
379 int last_pt_write_count;
381 struct kvm_guest_debug guest_debug;
383 char fx_buf[FX_BUF_SIZE];
385 char *guest_fx_image;
387 int guest_fpu_loaded;
388 struct vmx_host_state {
390 u16 fs_sel, gs_sel, ldt_sel;
391 int fs_gs_ldt_reload_needed;
395 int mmio_read_completed;
398 unsigned char mmio_data[8];
399 gpa_t mmio_phys_addr;
400 gva_t mmio_fault_cr2;
401 struct kvm_pio_request pio;
407 struct kvm_stat stat;
412 struct kvm_save_segment {
417 } tr, es, ds, fs, gs;
419 int halt_request; /* real mode on Intel only */
422 struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];
425 struct kvm_mem_alias {
427 unsigned long npages;
431 struct kvm_memory_slot {
433 unsigned long npages;
435 struct page **phys_mem;
436 unsigned long *dirty_bitmap;
440 spinlock_t lock; /* protects everything except vcpus */
442 struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
444 struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
446 * Hash table of struct kvm_mmu_page.
448 struct list_head active_mmu_pages;
449 int n_free_mmu_pages;
450 struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
452 struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
453 int memory_config_version;
455 unsigned long rmap_overflow;
456 struct list_head vm_list;
458 struct kvm_io_bus mmio_bus;
459 struct kvm_io_bus pio_bus;
462 struct descriptor_table {
465 } __attribute__((packed));
467 struct kvm_arch_ops {
468 int (*cpu_has_kvm_support)(void); /* __init */
469 int (*disabled_by_bios)(void); /* __init */
470 void (*hardware_enable)(void *dummy); /* __init */
471 void (*hardware_disable)(void *dummy);
472 int (*hardware_setup)(void); /* __init */
473 void (*hardware_unsetup)(void); /* __exit */
475 int (*vcpu_create)(struct kvm_vcpu *vcpu);
476 void (*vcpu_free)(struct kvm_vcpu *vcpu);
478 void (*vcpu_load)(struct kvm_vcpu *vcpu);
479 void (*vcpu_put)(struct kvm_vcpu *vcpu);
480 void (*vcpu_decache)(struct kvm_vcpu *vcpu);
482 int (*set_guest_debug)(struct kvm_vcpu *vcpu,
483 struct kvm_debug_guest *dbg);
484 int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
485 int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
486 u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
487 void (*get_segment)(struct kvm_vcpu *vcpu,
488 struct kvm_segment *var, int seg);
489 void (*set_segment)(struct kvm_vcpu *vcpu,
490 struct kvm_segment *var, int seg);
491 void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
492 void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
493 void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
494 void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
495 void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
496 void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
497 void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
498 void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
499 void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
500 void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
501 unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
502 void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
504 void (*cache_regs)(struct kvm_vcpu *vcpu);
505 void (*decache_regs)(struct kvm_vcpu *vcpu);
506 unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
507 void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
509 void (*invlpg)(struct kvm_vcpu *vcpu, gva_t addr);
510 void (*tlb_flush)(struct kvm_vcpu *vcpu);
511 void (*inject_page_fault)(struct kvm_vcpu *vcpu,
512 unsigned long addr, u32 err_code);
514 void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);
516 int (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
517 int (*vcpu_setup)(struct kvm_vcpu *vcpu);
518 void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
519 void (*patch_hypercall)(struct kvm_vcpu *vcpu,
520 unsigned char *hypercall_addr);
523 extern struct kvm_arch_ops *kvm_arch_ops;
525 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
526 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
528 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module);
529 void kvm_exit_arch(void);
531 int kvm_mmu_module_init(void);
532 void kvm_mmu_module_exit(void);
534 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
535 int kvm_mmu_create(struct kvm_vcpu *vcpu);
536 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
538 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
539 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
540 void kvm_mmu_zap_all(struct kvm *kvm);
542 hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
543 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
544 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
545 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
546 hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
547 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
549 void kvm_emulator_want_group7_invlpg(void);
551 extern hpa_t bad_page_address;
553 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
554 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
555 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
557 enum emulation_result {
558 EMULATE_DONE, /* no further processing */
559 EMULATE_DO_MMIO, /* kvm_run filled with mmio request */
560 EMULATE_FAIL, /* can't emulate this instruction */
563 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
564 unsigned long cr2, u16 error_code);
565 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
566 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
567 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
568 unsigned long *rflags);
570 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
571 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
572 unsigned long *rflags);
573 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
574 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
576 struct x86_emulate_ctxt;
578 int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
579 int size, unsigned long count, int string, int down,
580 gva_t address, int rep, unsigned port);
581 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
582 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
583 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
584 int emulate_clts(struct kvm_vcpu *vcpu);
585 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
586 unsigned long *dest);
587 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
588 unsigned long value);
590 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
591 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
592 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
593 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
594 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
596 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
597 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
599 void fx_init(struct kvm_vcpu *vcpu);
601 void load_msrs(struct vmx_msr_entry *e, int n);
602 void save_msrs(struct vmx_msr_entry *e, int n);
603 void kvm_resched(struct kvm_vcpu *vcpu);
604 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
605 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
606 void kvm_flush_remote_tlbs(struct kvm *kvm);
608 int kvm_read_guest(struct kvm_vcpu *vcpu,
613 int kvm_write_guest(struct kvm_vcpu *vcpu,
618 unsigned long segment_base(u16 selector);
620 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
621 const u8 *old, const u8 *new, int bytes);
622 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
623 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
624 int kvm_mmu_load(struct kvm_vcpu *vcpu);
625 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
627 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run);
629 static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
632 return vcpu->mmu.page_fault(vcpu, gva, error_code);
635 static inline void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
637 if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
638 __kvm_mmu_free_some_pages(vcpu);
641 static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu)
643 if (likely(vcpu->mmu.root_hpa != INVALID_PAGE))
646 return kvm_mmu_load(vcpu);
649 static inline int is_long_mode(struct kvm_vcpu *vcpu)
652 return vcpu->shadow_efer & EFER_LME;
658 static inline int is_pae(struct kvm_vcpu *vcpu)
660 return vcpu->cr4 & CR4_PAE_MASK;
663 static inline int is_pse(struct kvm_vcpu *vcpu)
665 return vcpu->cr4 & CR4_PSE_MASK;
668 static inline int is_paging(struct kvm_vcpu *vcpu)
670 return vcpu->cr0 & CR0_PG_MASK;
673 static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
675 return slot - kvm->memslots;
678 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
680 struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
682 return (struct kvm_mmu_page *)page_private(page);
685 static inline u16 read_fs(void)
688 asm ("mov %%fs, %0" : "=g"(seg));
692 static inline u16 read_gs(void)
695 asm ("mov %%gs, %0" : "=g"(seg));
699 static inline u16 read_ldt(void)
702 asm ("sldt %0" : "=g"(ldt));
706 static inline void load_fs(u16 sel)
708 asm ("mov %0, %%fs" : : "rm"(sel));
711 static inline void load_gs(u16 sel)
713 asm ("mov %0, %%gs" : : "rm"(sel));
717 static inline void load_ldt(u16 sel)
719 asm ("lldt %0" : : "rm"(sel));
723 static inline void get_idt(struct descriptor_table *table)
725 asm ("sidt %0" : "=m"(*table));
728 static inline void get_gdt(struct descriptor_table *table)
730 asm ("sgdt %0" : "=m"(*table));
733 static inline unsigned long read_tr_base(void)
736 asm ("str %0" : "=g"(tr));
737 return segment_base(tr);
741 static inline unsigned long read_msr(unsigned long msr)
750 static inline void fx_save(void *image)
752 asm ("fxsave (%0)":: "r" (image));
755 static inline void fx_restore(void *image)
757 asm ("fxrstor (%0)":: "r" (image));
760 static inline void fpu_init(void)
765 static inline u32 get_rdx_init_val(void)
767 return 0x600; /* P6 family */
770 #define ASM_VMX_VMCLEAR_RAX ".byte 0x66, 0x0f, 0xc7, 0x30"
771 #define ASM_VMX_VMLAUNCH ".byte 0x0f, 0x01, 0xc2"
772 #define ASM_VMX_VMRESUME ".byte 0x0f, 0x01, 0xc3"
773 #define ASM_VMX_VMPTRLD_RAX ".byte 0x0f, 0xc7, 0x30"
774 #define ASM_VMX_VMREAD_RDX_RAX ".byte 0x0f, 0x78, 0xd0"
775 #define ASM_VMX_VMWRITE_RAX_RDX ".byte 0x0f, 0x79, 0xd0"
776 #define ASM_VMX_VMWRITE_RSP_RDX ".byte 0x0f, 0x79, 0xd4"
777 #define ASM_VMX_VMXOFF ".byte 0x0f, 0x01, 0xc4"
778 #define ASM_VMX_VMXON_RAX ".byte 0xf3, 0x0f, 0xc7, 0x30"
780 #define MSR_IA32_TIME_STAMP_COUNTER 0x010
782 #define TSS_IOPB_BASE_OFFSET 0x66
783 #define TSS_BASE_SIZE 0x68
784 #define TSS_IOPB_SIZE (65536 / 8)
785 #define TSS_REDIRECTION_SIZE (256 / 8)
786 #define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)