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_X86__KVM_HOST_H
  12 #define ASM_X86__KVM_HOST_H
  13
  14 #include <linux/types.h>
  15 #include <linux/mm.h>
  16 #include <linux/mmu_notifier.h>
  17
  18 #include <linux/kvm.h>
  19 #include <linux/kvm_para.h>
  20 #include <linux/kvm_types.h>
  21
  22 #include <asm/pvclock-abi.h>
  23 #include <asm/desc.h>
  24
  25 #define KVM_MAX_VCPUS 16
  26 #define KVM_MEMORY_SLOTS 32
  27 /* memory slots that does not exposed to userspace */
  28 #define KVM_PRIVATE_MEM_SLOTS 4
  29
  30 #define KVM_PIO_PAGE_OFFSET 1
  31 #define KVM_COALESCED_MMIO_PAGE_OFFSET 2
  32
  33 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
  34 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
  35 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS |    \
  36                                   0xFFFFFF0000000000ULL)
  37
  38 #define KVM_GUEST_CR0_MASK                                 \
  39         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE \
  40          | X86_CR0_NW | X86_CR0_CD)
  41 #define KVM_VM_CR0_ALWAYS_ON                                            \
  42         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE | X86_CR0_TS \
  43          | X86_CR0_MP)
  44 #define KVM_GUEST_CR4_MASK                                              \
  45         (X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)
  46 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
  47 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
  48
  49 #define INVALID_PAGE (~(hpa_t)0)
  50 #define UNMAPPED_GVA (~(gpa_t)0)
  51
  52 /* shadow tables are PAE even on non-PAE hosts */
  53 #define KVM_HPAGE_SHIFT 21
  54 #define KVM_HPAGE_SIZE (1UL << KVM_HPAGE_SHIFT)
  55 #define KVM_HPAGE_MASK (~(KVM_HPAGE_SIZE - 1))
  56
  57 #define KVM_PAGES_PER_HPAGE (KVM_HPAGE_SIZE / PAGE_SIZE)
  58
  59 #define DE_VECTOR 0
  60 #define DB_VECTOR 1
  61 #define BP_VECTOR 3
  62 #define OF_VECTOR 4
  63 #define BR_VECTOR 5
  64 #define UD_VECTOR 6
  65 #define NM_VECTOR 7
  66 #define DF_VECTOR 8
  67 #define TS_VECTOR 10
  68 #define NP_VECTOR 11
  69 #define SS_VECTOR 12
  70 #define GP_VECTOR 13
  71 #define PF_VECTOR 14
  72 #define MF_VECTOR 16
  73 #define MC_VECTOR 18
  74
  75 #define SELECTOR_TI_MASK (1 << 2)
  76 #define SELECTOR_RPL_MASK 0x03
  77
  78 #define IOPL_SHIFT 12
  79
  80 #define KVM_ALIAS_SLOTS 4
  81
  82 #define KVM_PERMILLE_MMU_PAGES 20
  83 #define KVM_MIN_ALLOC_MMU_PAGES 64
  84 #define KVM_MMU_HASH_SHIFT 10
  85 #define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
  86 #define KVM_MIN_FREE_MMU_PAGES 5
  87 #define KVM_REFILL_PAGES 25
  88 #define KVM_MAX_CPUID_ENTRIES 40
  89 #define KVM_NR_VAR_MTRR 8
  90
  91 extern spinlock_t kvm_lock;
  92 extern struct list_head vm_list;
  93
  94 struct kvm_vcpu;
  95 struct kvm;
  96
  97 enum kvm_reg {
  98         VCPU_REGS_RAX = 0,
  99         VCPU_REGS_RCX = 1,
 100         VCPU_REGS_RDX = 2,
 101         VCPU_REGS_RBX = 3,
 102         VCPU_REGS_RSP = 4,
 103         VCPU_REGS_RBP = 5,
 104         VCPU_REGS_RSI = 6,
 105         VCPU_REGS_RDI = 7,
 106 #ifdef CONFIG_X86_64
 107         VCPU_REGS_R8 = 8,
 108         VCPU_REGS_R9 = 9,
 109         VCPU_REGS_R10 = 10,
 110         VCPU_REGS_R11 = 11,
 111         VCPU_REGS_R12 = 12,
 112         VCPU_REGS_R13 = 13,
 113         VCPU_REGS_R14 = 14,
 114         VCPU_REGS_R15 = 15,
 115 #endif
 116         VCPU_REGS_RIP,
 117         NR_VCPU_REGS
 118 };
 119
 120 enum {
 121         VCPU_SREG_ES,
 122         VCPU_SREG_CS,
 123         VCPU_SREG_SS,
 124         VCPU_SREG_DS,
 125         VCPU_SREG_FS,
 126         VCPU_SREG_GS,
 127         VCPU_SREG_TR,
 128         VCPU_SREG_LDTR,
 129 };
 130
 131 #include <asm/kvm_x86_emulate.h>
 132
 133 #define KVM_NR_MEM_OBJS 40
 134
 135 struct kvm_guest_debug {
 136         int enabled;
 137         unsigned long bp[4];
 138         int singlestep;
 139 };
 140
 141 /*
 142  * We don't want allocation failures within the mmu code, so we preallocate
 143  * enough memory for a single page fault in a cache.
 144  */
 145 struct kvm_mmu_memory_cache {
 146         int nobjs;
 147         void *objects[KVM_NR_MEM_OBJS];
 148 };
 149
 150 #define NR_PTE_CHAIN_ENTRIES 5
 151
 152 struct kvm_pte_chain {
 153         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 154         struct hlist_node link;
 155 };
 156
 157 /*
 158  * kvm_mmu_page_role, below, is defined as:
 159  *
 160  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 161  *   bits 4:7 - page table level for this shadow (1-4)
 162  *   bits 8:9 - page table quadrant for 2-level guests
 163  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 164  *   bits 17:19 - common access permissions for all ptes in this shadow page
 165  */
 166 union kvm_mmu_page_role {
 167         unsigned word;
 168         struct {
 169                 unsigned glevels:4;
 170                 unsigned level:4;
 171                 unsigned quadrant:2;
 172                 unsigned pad_for_nice_hex_output:6;
 173                 unsigned metaphysical:1;
 174                 unsigned access:3;
 175                 unsigned invalid:1;
 176         };
 177 };
 178
 179 struct kvm_mmu_page {
 180         struct list_head link;
 181         struct hlist_node hash_link;
 182
 183         /*
 184          * The following two entries are used to key the shadow page in the
 185          * hash table.
 186          */
 187         gfn_t gfn;
 188         union kvm_mmu_page_role role;
 189
 190         u64 *spt;
 191         /* hold the gfn of each spte inside spt */
 192         gfn_t *gfns;
 193         unsigned long slot_bitmap; /* One bit set per slot which has memory
 194                                     * in this shadow page.
 195                                     */
 196         int multimapped;         /* More than one parent_pte? */
 197         int root_count;          /* Currently serving as active root */
 198         union {
 199                 u64 *parent_pte;               /* !multimapped */
 200                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 201         };
 202 };
 203
 204 struct kvm_pv_mmu_op_buffer {
 205         void *ptr;
 206         unsigned len;
 207         unsigned processed;
 208         char buf[512] __aligned(sizeof(long));
 209 };
 210
 211 /*
 212  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 213  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 214  * mode.
 215  */
 216 struct kvm_mmu {
 217         void (*new_cr3)(struct kvm_vcpu *vcpu);
 218         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 219         void (*free)(struct kvm_vcpu *vcpu);
 220         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 221         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 222                               struct kvm_mmu_page *page);
 223         hpa_t root_hpa;
 224         int root_level;
 225         int shadow_root_level;
 226
 227         u64 *pae_root;
 228 };
 229
 230 struct kvm_vcpu_arch {
 231         u64 host_tsc;
 232         int interrupt_window_open;
 233         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 234         DECLARE_BITMAP(irq_pending, KVM_NR_INTERRUPTS);
 235         /*
 236          * rip and regs accesses must go through
 237          * kvm_{register,rip}_{read,write} functions.
 238          */
 239         unsigned long regs[NR_VCPU_REGS];
 240         u32 regs_avail;
 241         u32 regs_dirty;
 242
 243         unsigned long cr0;
 244         unsigned long cr2;
 245         unsigned long cr3;
 246         unsigned long cr4;
 247         unsigned long cr8;
 248         u64 pdptrs[4]; /* pae */
 249         u64 shadow_efer;
 250         u64 apic_base;
 251         struct kvm_lapic *apic;    /* kernel irqchip context */
 252         int mp_state;
 253         int sipi_vector;
 254         u64 ia32_misc_enable_msr;
 255         bool tpr_access_reporting;
 256
 257         struct kvm_mmu mmu;
 258         /* only needed in kvm_pv_mmu_op() path, but it's hot so
 259          * put it here to avoid allocation */
 260         struct kvm_pv_mmu_op_buffer mmu_op_buffer;
 261
 262         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 263         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 264         struct kvm_mmu_memory_cache mmu_page_cache;
 265         struct kvm_mmu_memory_cache mmu_page_header_cache;
 266
 267         gfn_t last_pt_write_gfn;
 268         int   last_pt_write_count;
 269         u64  *last_pte_updated;
 270         gfn_t last_pte_gfn;
 271
 272         struct {
 273                 gfn_t gfn;      /* presumed gfn during guest pte update */
 274                 pfn_t pfn;      /* pfn corresponding to that gfn */
 275                 int largepage;
 276                 unsigned long mmu_seq;
 277         } update_pte;
 278
 279         struct i387_fxsave_struct host_fx_image;
 280         struct i387_fxsave_struct guest_fx_image;
 281
 282         gva_t mmio_fault_cr2;
 283         struct kvm_pio_request pio;
 284         void *pio_data;
 285
 286         struct kvm_queued_exception {
 287                 bool pending;
 288                 bool has_error_code;
 289                 u8 nr;
 290                 u32 error_code;
 291         } exception;
 292
 293         struct kvm_queued_interrupt {
 294                 bool pending;
 295                 u8 nr;
 296         } interrupt;
 297
 298         struct {
 299                 int active;
 300                 u8 save_iopl;
 301                 struct kvm_save_segment {
 302                         u16 selector;
 303                         unsigned long base;
 304                         u32 limit;
 305                         u32 ar;
 306                 } tr, es, ds, fs, gs;
 307         } rmode;
 308         int halt_request; /* real mode on Intel only */
 309
 310         int cpuid_nent;
 311         struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 312         /* emulate context */
 313
 314         struct x86_emulate_ctxt emulate_ctxt;
 315
 316         gpa_t time;
 317         struct pvclock_vcpu_time_info hv_clock;
 318         unsigned int hv_clock_tsc_khz;
 319         unsigned int time_offset;
 320         struct page *time_page;
 321
 322         bool nmi_pending;
 323         bool nmi_injected;
 324
 325         u64 mtrr[0x100];
 326 };
 327
 328 struct kvm_mem_alias {
 329         gfn_t base_gfn;
 330         unsigned long npages;
 331         gfn_t target_gfn;
 332 };
 333
 334 struct kvm_irq_ack_notifier {
 335         struct hlist_node link;
 336         unsigned gsi;
 337         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
 338 };
 339
 340 struct kvm_assigned_dev_kernel {
 341         struct kvm_irq_ack_notifier ack_notifier;
 342         struct work_struct interrupt_work;
 343         struct list_head list;
 344         struct kvm_assigned_pci_dev assigned_dev;
 345         int assigned_dev_id;
 346         int host_busnr;
 347         int host_devfn;
 348         int host_irq;
 349         int guest_irq;
 350         int irq_requested;
 351         struct pci_dev *dev;
 352         struct kvm *kvm;
 353 };
 354
 355 struct kvm_arch{
 356         int naliases;
 357         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 358
 359         unsigned int n_free_mmu_pages;
 360         unsigned int n_requested_mmu_pages;
 361         unsigned int n_alloc_mmu_pages;
 362         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 363         /*
 364          * Hash table of struct kvm_mmu_page.
 365          */
 366         struct list_head active_mmu_pages;
 367         struct list_head assigned_dev_head;
 368         struct kvm_pic *vpic;
 369         struct kvm_ioapic *vioapic;
 370         struct kvm_pit *vpit;
 371         struct hlist_head irq_ack_notifier_list;
 372
 373         int round_robin_prev_vcpu;
 374         unsigned int tss_addr;
 375         struct page *apic_access_page;
 376
 377         gpa_t wall_clock;
 378
 379         struct page *ept_identity_pagetable;
 380         bool ept_identity_pagetable_done;
 381 };
 382
 383 struct kvm_vm_stat {
 384         u32 mmu_shadow_zapped;
 385         u32 mmu_pte_write;
 386         u32 mmu_pte_updated;
 387         u32 mmu_pde_zapped;
 388         u32 mmu_flooded;
 389         u32 mmu_recycled;
 390         u32 mmu_cache_miss;
 391         u32 remote_tlb_flush;
 392         u32 lpages;
 393 };
 394
 395 struct kvm_vcpu_stat {
 396         u32 pf_fixed;
 397         u32 pf_guest;
 398         u32 tlb_flush;
 399         u32 invlpg;
 400
 401         u32 exits;
 402         u32 io_exits;
 403         u32 mmio_exits;
 404         u32 signal_exits;
 405         u32 irq_window_exits;
 406         u32 nmi_window_exits;
 407         u32 halt_exits;
 408         u32 halt_wakeup;
 409         u32 request_irq_exits;
 410         u32 irq_exits;
 411         u32 host_state_reload;
 412         u32 efer_reload;
 413         u32 fpu_reload;
 414         u32 insn_emulation;
 415         u32 insn_emulation_fail;
 416         u32 hypercalls;
 417 };
 418
 419 struct descriptor_table {
 420         u16 limit;
 421         unsigned long base;
 422 } __attribute__((packed));
 423
 424 struct kvm_x86_ops {
 425         int (*cpu_has_kvm_support)(void);          /* __init */
 426         int (*disabled_by_bios)(void);             /* __init */
 427         void (*hardware_enable)(void *dummy);      /* __init */
 428         void (*hardware_disable)(void *dummy);
 429         void (*check_processor_compatibility)(void *rtn);
 430         int (*hardware_setup)(void);               /* __init */
 431         void (*hardware_unsetup)(void);            /* __exit */
 432         bool (*cpu_has_accelerated_tpr)(void);
 433
 434         /* Create, but do not attach this VCPU */
 435         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 436         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 437         int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 438
 439         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 440         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 441         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 442
 443         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 444                                struct kvm_debug_guest *dbg);
 445         void (*guest_debug_pre)(struct kvm_vcpu *vcpu);
 446         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 447         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 448         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 449         void (*get_segment)(struct kvm_vcpu *vcpu,
 450                             struct kvm_segment *var, int seg);
 451         int (*get_cpl)(struct kvm_vcpu *vcpu);
 452         void (*set_segment)(struct kvm_vcpu *vcpu,
 453                             struct kvm_segment *var, int seg);
 454         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 455         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 456         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 457         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 458         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 459         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 460         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 461         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 462         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 463         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 464         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 465         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 466                        int *exception);
 467         void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
 468         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 469         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 470
 471         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 472
 473         void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 474         int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 475         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 476         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 477                                 unsigned char *hypercall_addr);
 478         int (*get_irq)(struct kvm_vcpu *vcpu);
 479         void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
 480         void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
 481                                 bool has_error_code, u32 error_code);
 482         bool (*exception_injected)(struct kvm_vcpu *vcpu);
 483         void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
 484         void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
 485                                        struct kvm_run *run);
 486
 487         int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 488         int (*get_tdp_level)(void);
 489 };
 490
 491 extern struct kvm_x86_ops *kvm_x86_ops;
 492
 493 int kvm_mmu_module_init(void);
 494 void kvm_mmu_module_exit(void);
 495
 496 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 497 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 498 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 499 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 500 void kvm_mmu_set_base_ptes(u64 base_pte);
 501 void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
 502                 u64 dirty_mask, u64 nx_mask, u64 x_mask);
 503
 504 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 505 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 506 void kvm_mmu_zap_all(struct kvm *kvm);
 507 unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
 508 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 509
 510 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 511
 512 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 513                           const void *val, int bytes);
 514 int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
 515                   gpa_t addr, unsigned long *ret);
 516
 517 extern bool tdp_enabled;
 518
 519 enum emulation_result {
 520         EMULATE_DONE,       /* no further processing */
 521         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 522         EMULATE_FAIL,         /* can't emulate this instruction */
 523 };
 524
 525 #define EMULTYPE_NO_DECODE          (1 << 0)
 526 #define EMULTYPE_TRAP_UD            (1 << 1)
 527 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 528                         unsigned long cr2, u16 error_code, int emulation_type);
 529 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 530 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 531 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 532 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 533                    unsigned long *rflags);
 534
 535 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 536 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 537                      unsigned long *rflags);
 538 void kvm_enable_efer_bits(u64);
 539 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 540 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 541
 542 struct x86_emulate_ctxt;
 543
 544 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 545                      int size, unsigned port);
 546 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 547                            int size, unsigned long count, int down,
 548                             gva_t address, int rep, unsigned port);
 549 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 550 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 551 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 552 int emulate_clts(struct kvm_vcpu *vcpu);
 553 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 554                     unsigned long *dest);
 555 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 556                     unsigned long value);
 557
 558 void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 559 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
 560                                 int type_bits, int seg);
 561
 562 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason);
 563
 564 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 565 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
 566 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
 567 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
 568 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu);
 569 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 570 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 571
 572 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 573 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 574
 575 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 576 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 577 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 578                            u32 error_code);
 579
 580 void kvm_inject_nmi(struct kvm_vcpu *vcpu);
 581
 582 void fx_init(struct kvm_vcpu *vcpu);
 583
 584 int emulator_read_std(unsigned long addr,
 585                       void *val,
 586                       unsigned int bytes,
 587                       struct kvm_vcpu *vcpu);
 588 int emulator_write_emulated(unsigned long addr,
 589                             const void *val,
 590                             unsigned int bytes,
 591                             struct kvm_vcpu *vcpu);
 592
 593 unsigned long segment_base(u16 selector);
 594
 595 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 596 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 597                        const u8 *new, int bytes);
 598 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 599 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 600 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 601 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 602
 603 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 604
 605 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 606
 607 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 608
 609 void kvm_enable_tdp(void);
 610 void kvm_disable_tdp(void);
 611
 612 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 613 int complete_pio(struct kvm_vcpu *vcpu);
 614
 615 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 616 {
 617         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 618
 619         return (struct kvm_mmu_page *)page_private(page);
 620 }
 621
 622 static inline u16 kvm_read_fs(void)
 623 {
 624         u16 seg;
 625         asm("mov %%fs, %0" : "=g"(seg));
 626         return seg;
 627 }
 628
 629 static inline u16 kvm_read_gs(void)
 630 {
 631         u16 seg;
 632         asm("mov %%gs, %0" : "=g"(seg));
 633         return seg;
 634 }
 635
 636 static inline u16 kvm_read_ldt(void)
 637 {
 638         u16 ldt;
 639         asm("sldt %0" : "=g"(ldt));
 640         return ldt;
 641 }
 642
 643 static inline void kvm_load_fs(u16 sel)
 644 {
 645         asm("mov %0, %%fs" : : "rm"(sel));
 646 }
 647
 648 static inline void kvm_load_gs(u16 sel)
 649 {
 650         asm("mov %0, %%gs" : : "rm"(sel));
 651 }
 652
 653 static inline void kvm_load_ldt(u16 sel)
 654 {
 655         asm("lldt %0" : : "rm"(sel));
 656 }
 657
 658 static inline void kvm_get_idt(struct descriptor_table *table)
 659 {
 660         asm("sidt %0" : "=m"(*table));
 661 }
 662
 663 static inline void kvm_get_gdt(struct descriptor_table *table)
 664 {
 665         asm("sgdt %0" : "=m"(*table));
 666 }
 667
 668 static inline unsigned long kvm_read_tr_base(void)
 669 {
 670         u16 tr;
 671         asm("str %0" : "=g"(tr));
 672         return segment_base(tr);
 673 }
 674
 675 #ifdef CONFIG_X86_64
 676 static inline unsigned long read_msr(unsigned long msr)
 677 {
 678         u64 value;
 679
 680         rdmsrl(msr, value);
 681         return value;
 682 }
 683 #endif
 684
 685 static inline void kvm_fx_save(struct i387_fxsave_struct *image)
 686 {
 687         asm("fxsave (%0)":: "r" (image));
 688 }
 689
 690 static inline void kvm_fx_restore(struct i387_fxsave_struct *image)
 691 {
 692         asm("fxrstor (%0)":: "r" (image));
 693 }
 694
 695 static inline void kvm_fx_finit(void)
 696 {
 697         asm("finit");
 698 }
 699
 700 static inline u32 get_rdx_init_val(void)
 701 {
 702         return 0x600; /* P6 family */
 703 }
 704
 705 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 706 {
 707         kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 708 }
 709
 710 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 711 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 712 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 713 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 714 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 715 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 716 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 717 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 718 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 719 #define ASM_VMX_INVEPT            ".byte 0x66, 0x0f, 0x38, 0x80, 0x08"
 720 #define ASM_VMX_INVVPID           ".byte 0x66, 0x0f, 0x38, 0x81, 0x08"
 721
 722 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 723
 724 #define TSS_IOPB_BASE_OFFSET 0x66
 725 #define TSS_BASE_SIZE 0x68
 726 #define TSS_IOPB_SIZE (65536 / 8)
 727 #define TSS_REDIRECTION_SIZE (256 / 8)
 728 #define RMODE_TSS_SIZE                                                  \
 729         (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 730
 731 enum {
 732         TASK_SWITCH_CALL = 0,
 733         TASK_SWITCH_IRET = 1,
 734         TASK_SWITCH_JMP = 2,
 735         TASK_SWITCH_GATE = 3,
 736 };
 737
 738
 739 #ifdef CONFIG_64BIT
 740 # define KVM_EX_ENTRY ".quad"
 741 # define KVM_EX_PUSH "pushq"
 742 #else
 743 # define KVM_EX_ENTRY ".long"
 744 # define KVM_EX_PUSH "pushl"
 745 #endif
 746
 747 /*
 748  * Hardware virtualization extension instructions may fault if a
 749  * reboot turns off virtualization while processes are running.
 750  * Trap the fault and ignore the instruction if that happens.
 751  */
 752 asmlinkage void kvm_handle_fault_on_reboot(void);
 753
 754 #define __kvm_handle_fault_on_reboot(insn) \
 755         "666: " insn "\n\t" \
 756         ".pushsection .fixup, \"ax\" \n" \
 757         "667: \n\t" \
 758         KVM_EX_PUSH " $666b \n\t" \
 759         "jmp kvm_handle_fault_on_reboot \n\t" \
 760         ".popsection \n\t" \
 761         ".pushsection __ex_table, \"a\" \n\t" \
 762         KVM_EX_ENTRY " 666b, 667b \n\t" \
 763         ".popsection"
 764
 765 #define KVM_ARCH_WANT_MMU_NOTIFIER
 766 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 767 int kvm_age_hva(struct kvm *kvm, unsigned long hva);
 768
 769 #endif /* ASM_X86__KVM_HOST_H */