include/asm-x86/kvm_host.h

   1 #/*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * This header defines architecture specific interfaces, x86 version
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2.  See
   7  * the COPYING file in the top-level directory.
   8  *
   9  */
  10
  11 #ifndef ASM_KVM_HOST_H
  12 #define ASM_KVM_HOST_H
  13
  14 #include <linux/types.h>
  15 #include <linux/mm.h>
  16
  17 #include <linux/kvm.h>
  18 #include <linux/kvm_para.h>
  19 #include <linux/kvm_types.h>
  20
  21 #include <asm/desc.h>
  22
  23 #define KVM_MAX_VCPUS 16
  24 #define KVM_MEMORY_SLOTS 32
  25 /* memory slots that does not exposed to userspace */
  26 #define KVM_PRIVATE_MEM_SLOTS 4
  27
  28 #define KVM_PIO_PAGE_OFFSET 1
  29
  30 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
  31 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
  32 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS |    \
  33                                   0xFFFFFF0000000000ULL)
  34
  35 #define KVM_GUEST_CR0_MASK                                 \
  36         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE \
  37          | X86_CR0_NW | X86_CR0_CD)
  38 #define KVM_VM_CR0_ALWAYS_ON                                            \
  39         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE | X86_CR0_TS \
  40          | X86_CR0_MP)
  41 #define KVM_GUEST_CR4_MASK                                              \
  42         (X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)
  43 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
  44 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
  45
  46 #define INVALID_PAGE (~(hpa_t)0)
  47 #define UNMAPPED_GVA (~(gpa_t)0)
  48
  49 /* shadow tables are PAE even on non-PAE hosts */
  50 #define KVM_HPAGE_SHIFT 21
  51 #define KVM_HPAGE_SIZE (1UL << KVM_HPAGE_SHIFT)
  52 #define KVM_HPAGE_MASK (~(KVM_HPAGE_SIZE - 1))
  53
  54 #define KVM_PAGES_PER_HPAGE (KVM_HPAGE_SIZE / PAGE_SIZE)
  55
  56 #define DE_VECTOR 0
  57 #define UD_VECTOR 6
  58 #define NM_VECTOR 7
  59 #define DF_VECTOR 8
  60 #define TS_VECTOR 10
  61 #define NP_VECTOR 11
  62 #define SS_VECTOR 12
  63 #define GP_VECTOR 13
  64 #define PF_VECTOR 14
  65
  66 #define SELECTOR_TI_MASK (1 << 2)
  67 #define SELECTOR_RPL_MASK 0x03
  68
  69 #define IOPL_SHIFT 12
  70
  71 #define KVM_ALIAS_SLOTS 4
  72
  73 #define KVM_PERMILLE_MMU_PAGES 20
  74 #define KVM_MIN_ALLOC_MMU_PAGES 64
  75 #define KVM_MMU_HASH_SHIFT 10
  76 #define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
  77 #define KVM_MIN_FREE_MMU_PAGES 5
  78 #define KVM_REFILL_PAGES 25
  79 #define KVM_MAX_CPUID_ENTRIES 40
  80
  81 extern spinlock_t kvm_lock;
  82 extern struct list_head vm_list;
  83
  84 struct kvm_vcpu;
  85 struct kvm;
  86
  87 enum {
  88         VCPU_REGS_RAX = 0,
  89         VCPU_REGS_RCX = 1,
  90         VCPU_REGS_RDX = 2,
  91         VCPU_REGS_RBX = 3,
  92         VCPU_REGS_RSP = 4,
  93         VCPU_REGS_RBP = 5,
  94         VCPU_REGS_RSI = 6,
  95         VCPU_REGS_RDI = 7,
  96 #ifdef CONFIG_X86_64
  97         VCPU_REGS_R8 = 8,
  98         VCPU_REGS_R9 = 9,
  99         VCPU_REGS_R10 = 10,
 100         VCPU_REGS_R11 = 11,
 101         VCPU_REGS_R12 = 12,
 102         VCPU_REGS_R13 = 13,
 103         VCPU_REGS_R14 = 14,
 104         VCPU_REGS_R15 = 15,
 105 #endif
 106         NR_VCPU_REGS
 107 };
 108
 109 enum {
 110         VCPU_SREG_CS,
 111         VCPU_SREG_DS,
 112         VCPU_SREG_ES,
 113         VCPU_SREG_FS,
 114         VCPU_SREG_GS,
 115         VCPU_SREG_SS,
 116         VCPU_SREG_TR,
 117         VCPU_SREG_LDTR,
 118 };
 119
 120 #include <asm/kvm_x86_emulate.h>
 121
 122 #define KVM_NR_MEM_OBJS 40
 123
 124 struct kvm_guest_debug {
 125         int enabled;
 126         unsigned long bp[4];
 127         int singlestep;
 128 };
 129
 130 /*
 131  * We don't want allocation failures within the mmu code, so we preallocate
 132  * enough memory for a single page fault in a cache.
 133  */
 134 struct kvm_mmu_memory_cache {
 135         int nobjs;
 136         void *objects[KVM_NR_MEM_OBJS];
 137 };
 138
 139 #define NR_PTE_CHAIN_ENTRIES 5
 140
 141 struct kvm_pte_chain {
 142         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 143         struct hlist_node link;
 144 };
 145
 146 /*
 147  * kvm_mmu_page_role, below, is defined as:
 148  *
 149  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 150  *   bits 4:7 - page table level for this shadow (1-4)
 151  *   bits 8:9 - page table quadrant for 2-level guests
 152  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 153  *   bits 17:19 - common access permissions for all ptes in this shadow page
 154  */
 155 union kvm_mmu_page_role {
 156         unsigned word;
 157         struct {
 158                 unsigned glevels:4;
 159                 unsigned level:4;
 160                 unsigned quadrant:2;
 161                 unsigned pad_for_nice_hex_output:6;
 162                 unsigned metaphysical:1;
 163                 unsigned access:3;
 164                 unsigned invalid:1;
 165         };
 166 };
 167
 168 struct kvm_mmu_page {
 169         struct list_head link;
 170         struct hlist_node hash_link;
 171
 172         /*
 173          * The following two entries are used to key the shadow page in the
 174          * hash table.
 175          */
 176         gfn_t gfn;
 177         union kvm_mmu_page_role role;
 178
 179         u64 *spt;
 180         /* hold the gfn of each spte inside spt */
 181         gfn_t *gfns;
 182         unsigned long slot_bitmap; /* One bit set per slot which has memory
 183                                     * in this shadow page.
 184                                     */
 185         int multimapped;         /* More than one parent_pte? */
 186         int root_count;          /* Currently serving as active root */
 187         union {
 188                 u64 *parent_pte;               /* !multimapped */
 189                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 190         };
 191 };
 192
 193 /*
 194  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 195  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 196  * mode.
 197  */
 198 struct kvm_mmu {
 199         void (*new_cr3)(struct kvm_vcpu *vcpu);
 200         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 201         void (*free)(struct kvm_vcpu *vcpu);
 202         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 203         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 204                               struct kvm_mmu_page *page);
 205         hpa_t root_hpa;
 206         int root_level;
 207         int shadow_root_level;
 208
 209         u64 *pae_root;
 210 };
 211
 212 struct kvm_vcpu_arch {
 213         u64 host_tsc;
 214         int interrupt_window_open;
 215         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 216         DECLARE_BITMAP(irq_pending, KVM_NR_INTERRUPTS);
 217         unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
 218         unsigned long rip;      /* needs vcpu_load_rsp_rip() */
 219
 220         unsigned long cr0;
 221         unsigned long cr2;
 222         unsigned long cr3;
 223         unsigned long cr4;
 224         unsigned long cr8;
 225         u64 pdptrs[4]; /* pae */
 226         u64 shadow_efer;
 227         u64 apic_base;
 228         struct kvm_lapic *apic;    /* kernel irqchip context */
 229 #define VCPU_MP_STATE_RUNNABLE          0
 230 #define VCPU_MP_STATE_UNINITIALIZED     1
 231 #define VCPU_MP_STATE_INIT_RECEIVED     2
 232 #define VCPU_MP_STATE_SIPI_RECEIVED     3
 233 #define VCPU_MP_STATE_HALTED            4
 234         int mp_state;
 235         int sipi_vector;
 236         u64 ia32_misc_enable_msr;
 237         bool tpr_access_reporting;
 238
 239         struct kvm_mmu mmu;
 240
 241         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 242         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 243         struct kvm_mmu_memory_cache mmu_page_cache;
 244         struct kvm_mmu_memory_cache mmu_page_header_cache;
 245
 246         gfn_t last_pt_write_gfn;
 247         int   last_pt_write_count;
 248         u64  *last_pte_updated;
 249
 250         struct {
 251                 gfn_t gfn;      /* presumed gfn during guest pte update */
 252                 pfn_t pfn;      /* pfn corresponding to that gfn */
 253                 int largepage;
 254         } update_pte;
 255
 256         struct i387_fxsave_struct host_fx_image;
 257         struct i387_fxsave_struct guest_fx_image;
 258
 259         gva_t mmio_fault_cr2;
 260         struct kvm_pio_request pio;
 261         void *pio_data;
 262
 263         struct kvm_queued_exception {
 264                 bool pending;
 265                 bool has_error_code;
 266                 u8 nr;
 267                 u32 error_code;
 268         } exception;
 269
 270         struct {
 271                 int active;
 272                 u8 save_iopl;
 273                 struct kvm_save_segment {
 274                         u16 selector;
 275                         unsigned long base;
 276                         u32 limit;
 277                         u32 ar;
 278                 } tr, es, ds, fs, gs;
 279         } rmode;
 280         int halt_request; /* real mode on Intel only */
 281
 282         int cpuid_nent;
 283         struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 284         /* emulate context */
 285
 286         struct x86_emulate_ctxt emulate_ctxt;
 287
 288         gpa_t time;
 289         struct kvm_vcpu_time_info hv_clock;
 290         unsigned int time_offset;
 291         struct page *time_page;
 292 };
 293
 294 struct kvm_mem_alias {
 295         gfn_t base_gfn;
 296         unsigned long npages;
 297         gfn_t target_gfn;
 298 };
 299
 300 struct kvm_arch{
 301         int naliases;
 302         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 303
 304         unsigned int n_free_mmu_pages;
 305         unsigned int n_requested_mmu_pages;
 306         unsigned int n_alloc_mmu_pages;
 307         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 308         /*
 309          * Hash table of struct kvm_mmu_page.
 310          */
 311         struct list_head active_mmu_pages;
 312         struct kvm_pic *vpic;
 313         struct kvm_ioapic *vioapic;
 314         struct kvm_pit *vpit;
 315
 316         int round_robin_prev_vcpu;
 317         unsigned int tss_addr;
 318         struct page *apic_access_page;
 319
 320         gpa_t wall_clock;
 321 };
 322
 323 struct kvm_vm_stat {
 324         u32 mmu_shadow_zapped;
 325         u32 mmu_pte_write;
 326         u32 mmu_pte_updated;
 327         u32 mmu_pde_zapped;
 328         u32 mmu_flooded;
 329         u32 mmu_recycled;
 330         u32 mmu_cache_miss;
 331         u32 remote_tlb_flush;
 332         u32 lpages;
 333 };
 334
 335 struct kvm_vcpu_stat {
 336         u32 pf_fixed;
 337         u32 pf_guest;
 338         u32 tlb_flush;
 339         u32 invlpg;
 340
 341         u32 exits;
 342         u32 io_exits;
 343         u32 mmio_exits;
 344         u32 signal_exits;
 345         u32 irq_window_exits;
 346         u32 halt_exits;
 347         u32 halt_wakeup;
 348         u32 request_irq_exits;
 349         u32 irq_exits;
 350         u32 host_state_reload;
 351         u32 efer_reload;
 352         u32 fpu_reload;
 353         u32 insn_emulation;
 354         u32 insn_emulation_fail;
 355         u32 hypercalls;
 356 };
 357
 358 struct descriptor_table {
 359         u16 limit;
 360         unsigned long base;
 361 } __attribute__((packed));
 362
 363 struct kvm_x86_ops {
 364         int (*cpu_has_kvm_support)(void);          /* __init */
 365         int (*disabled_by_bios)(void);             /* __init */
 366         void (*hardware_enable)(void *dummy);      /* __init */
 367         void (*hardware_disable)(void *dummy);
 368         void (*check_processor_compatibility)(void *rtn);
 369         int (*hardware_setup)(void);               /* __init */
 370         void (*hardware_unsetup)(void);            /* __exit */
 371         bool (*cpu_has_accelerated_tpr)(void);
 372
 373         /* Create, but do not attach this VCPU */
 374         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 375         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 376         int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 377
 378         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 379         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 380         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 381         void (*vcpu_decache)(struct kvm_vcpu *vcpu);
 382
 383         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 384                                struct kvm_debug_guest *dbg);
 385         void (*guest_debug_pre)(struct kvm_vcpu *vcpu);
 386         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 387         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 388         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 389         void (*get_segment)(struct kvm_vcpu *vcpu,
 390                             struct kvm_segment *var, int seg);
 391         int (*get_cpl)(struct kvm_vcpu *vcpu);
 392         void (*set_segment)(struct kvm_vcpu *vcpu,
 393                             struct kvm_segment *var, int seg);
 394         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 395         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 396         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 397         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 398         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 399         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 400         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 401         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 402         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 403         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 404         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 405         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 406                        int *exception);
 407         void (*cache_regs)(struct kvm_vcpu *vcpu);
 408         void (*decache_regs)(struct kvm_vcpu *vcpu);
 409         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 410         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 411
 412         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 413
 414         void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 415         int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 416         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 417         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 418                                 unsigned char *hypercall_addr);
 419         int (*get_irq)(struct kvm_vcpu *vcpu);
 420         void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
 421         void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
 422                                 bool has_error_code, u32 error_code);
 423         bool (*exception_injected)(struct kvm_vcpu *vcpu);
 424         void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
 425         void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
 426                                        struct kvm_run *run);
 427
 428         int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 429 };
 430
 431 extern struct kvm_x86_ops *kvm_x86_ops;
 432
 433 int kvm_mmu_module_init(void);
 434 void kvm_mmu_module_exit(void);
 435
 436 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 437 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 438 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 439 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 440
 441 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 442 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 443 void kvm_mmu_zap_all(struct kvm *kvm);
 444 unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
 445 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 446
 447 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 448
 449 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 450                           const void *val, int bytes);
 451 int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
 452                   gpa_t addr, unsigned long *ret);
 453
 454 extern bool tdp_enabled;
 455
 456 enum emulation_result {
 457         EMULATE_DONE,       /* no further processing */
 458         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 459         EMULATE_FAIL,         /* can't emulate this instruction */
 460 };
 461
 462 #define EMULTYPE_NO_DECODE          (1 << 0)
 463 #define EMULTYPE_TRAP_UD            (1 << 1)
 464 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 465                         unsigned long cr2, u16 error_code, int emulation_type);
 466 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 467 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 468 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 469 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 470                    unsigned long *rflags);
 471
 472 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 473 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 474                      unsigned long *rflags);
 475 void kvm_enable_efer_bits(u64);
 476 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 477 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 478
 479 struct x86_emulate_ctxt;
 480
 481 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 482                      int size, unsigned port);
 483 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 484                            int size, unsigned long count, int down,
 485                             gva_t address, int rep, unsigned port);
 486 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 487 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 488 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 489 int emulate_clts(struct kvm_vcpu *vcpu);
 490 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 491                     unsigned long *dest);
 492 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 493                     unsigned long value);
 494
 495 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason);
 496
 497 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 498 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
 499 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
 500 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
 501 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu);
 502 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 503 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 504
 505 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 506 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 507
 508 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 509 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 510 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 511                            u32 error_code);
 512
 513 void fx_init(struct kvm_vcpu *vcpu);
 514
 515 int emulator_read_std(unsigned long addr,
 516                       void *val,
 517                       unsigned int bytes,
 518                       struct kvm_vcpu *vcpu);
 519 int emulator_write_emulated(unsigned long addr,
 520                             const void *val,
 521                             unsigned int bytes,
 522                             struct kvm_vcpu *vcpu);
 523
 524 unsigned long segment_base(u16 selector);
 525
 526 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 527 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 528                        const u8 *new, int bytes);
 529 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 530 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 531 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 532 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 533
 534 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 535
 536 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 537
 538 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 539
 540 void kvm_enable_tdp(void);
 541
 542 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 543 int complete_pio(struct kvm_vcpu *vcpu);
 544
 545 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 546 {
 547         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 548
 549         return (struct kvm_mmu_page *)page_private(page);
 550 }
 551
 552 static inline u16 read_fs(void)
 553 {
 554         u16 seg;
 555         asm("mov %%fs, %0" : "=g"(seg));
 556         return seg;
 557 }
 558
 559 static inline u16 read_gs(void)
 560 {
 561         u16 seg;
 562         asm("mov %%gs, %0" : "=g"(seg));
 563         return seg;
 564 }
 565
 566 static inline u16 read_ldt(void)
 567 {
 568         u16 ldt;
 569         asm("sldt %0" : "=g"(ldt));
 570         return ldt;
 571 }
 572
 573 static inline void load_fs(u16 sel)
 574 {
 575         asm("mov %0, %%fs" : : "rm"(sel));
 576 }
 577
 578 static inline void load_gs(u16 sel)
 579 {
 580         asm("mov %0, %%gs" : : "rm"(sel));
 581 }
 582
 583 #ifndef load_ldt
 584 static inline void load_ldt(u16 sel)
 585 {
 586         asm("lldt %0" : : "rm"(sel));
 587 }
 588 #endif
 589
 590 static inline void get_idt(struct descriptor_table *table)
 591 {
 592         asm("sidt %0" : "=m"(*table));
 593 }
 594
 595 static inline void get_gdt(struct descriptor_table *table)
 596 {
 597         asm("sgdt %0" : "=m"(*table));
 598 }
 599
 600 static inline unsigned long read_tr_base(void)
 601 {
 602         u16 tr;
 603         asm("str %0" : "=g"(tr));
 604         return segment_base(tr);
 605 }
 606
 607 #ifdef CONFIG_X86_64
 608 static inline unsigned long read_msr(unsigned long msr)
 609 {
 610         u64 value;
 611
 612         rdmsrl(msr, value);
 613         return value;
 614 }
 615 #endif
 616
 617 static inline void fx_save(struct i387_fxsave_struct *image)
 618 {
 619         asm("fxsave (%0)":: "r" (image));
 620 }
 621
 622 static inline void fx_restore(struct i387_fxsave_struct *image)
 623 {
 624         asm("fxrstor (%0)":: "r" (image));
 625 }
 626
 627 static inline void fpu_init(void)
 628 {
 629         asm("finit");
 630 }
 631
 632 static inline u32 get_rdx_init_val(void)
 633 {
 634         return 0x600; /* P6 family */
 635 }
 636
 637 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 638 {
 639         kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 640 }
 641
 642 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 643 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 644 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 645 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 646 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 647 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 648 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 649 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 650 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 651 #define ASM_VMX_INVVPID           ".byte 0x66, 0x0f, 0x38, 0x81, 0x08"
 652
 653 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 654
 655 #define TSS_IOPB_BASE_OFFSET 0x66
 656 #define TSS_BASE_SIZE 0x68
 657 #define TSS_IOPB_SIZE (65536 / 8)
 658 #define TSS_REDIRECTION_SIZE (256 / 8)
 659 #define RMODE_TSS_SIZE                                                  \
 660         (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 661
 662 enum {
 663         TASK_SWITCH_CALL = 0,
 664         TASK_SWITCH_IRET = 1,
 665         TASK_SWITCH_JMP = 2,
 666         TASK_SWITCH_GATE = 3,
 667 };
 668
 669 #endif