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/pvclock-abi.h>
  22 #include <asm/desc.h>
  23
  24 #define KVM_MAX_VCPUS 16
  25 #define KVM_MEMORY_SLOTS 32
  26 /* memory slots that does not exposed to userspace */
  27 #define KVM_PRIVATE_MEM_SLOTS 4
  28
  29 #define KVM_PIO_PAGE_OFFSET 1
  30
  31 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
  32 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
  33 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS |    \
  34                                   0xFFFFFF0000000000ULL)
  35
  36 #define KVM_GUEST_CR0_MASK                                 \
  37         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE \
  38          | X86_CR0_NW | X86_CR0_CD)
  39 #define KVM_VM_CR0_ALWAYS_ON                                            \
  40         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE | X86_CR0_TS \
  41          | X86_CR0_MP)
  42 #define KVM_GUEST_CR4_MASK                                              \
  43         (X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)
  44 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
  45 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
  46
  47 #define INVALID_PAGE (~(hpa_t)0)
  48 #define UNMAPPED_GVA (~(gpa_t)0)
  49
  50 /* shadow tables are PAE even on non-PAE hosts */
  51 #define KVM_HPAGE_SHIFT 21
  52 #define KVM_HPAGE_SIZE (1UL << KVM_HPAGE_SHIFT)
  53 #define KVM_HPAGE_MASK (~(KVM_HPAGE_SIZE - 1))
  54
  55 #define KVM_PAGES_PER_HPAGE (KVM_HPAGE_SIZE / PAGE_SIZE)
  56
  57 #define DE_VECTOR 0
  58 #define UD_VECTOR 6
  59 #define NM_VECTOR 7
  60 #define DF_VECTOR 8
  61 #define TS_VECTOR 10
  62 #define NP_VECTOR 11
  63 #define SS_VECTOR 12
  64 #define GP_VECTOR 13
  65 #define PF_VECTOR 14
  66 #define MC_VECTOR 18
  67
  68 #define SELECTOR_TI_MASK (1 << 2)
  69 #define SELECTOR_RPL_MASK 0x03
  70
  71 #define IOPL_SHIFT 12
  72
  73 #define KVM_ALIAS_SLOTS 4
  74
  75 #define KVM_PERMILLE_MMU_PAGES 20
  76 #define KVM_MIN_ALLOC_MMU_PAGES 64
  77 #define KVM_MMU_HASH_SHIFT 10
  78 #define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
  79 #define KVM_MIN_FREE_MMU_PAGES 5
  80 #define KVM_REFILL_PAGES 25
  81 #define KVM_MAX_CPUID_ENTRIES 40
  82
  83 extern spinlock_t kvm_lock;
  84 extern struct list_head vm_list;
  85
  86 struct kvm_vcpu;
  87 struct kvm;
  88
  89 enum {
  90         VCPU_REGS_RAX = 0,
  91         VCPU_REGS_RCX = 1,
  92         VCPU_REGS_RDX = 2,
  93         VCPU_REGS_RBX = 3,
  94         VCPU_REGS_RSP = 4,
  95         VCPU_REGS_RBP = 5,
  96         VCPU_REGS_RSI = 6,
  97         VCPU_REGS_RDI = 7,
  98 #ifdef CONFIG_X86_64
  99         VCPU_REGS_R8 = 8,
 100         VCPU_REGS_R9 = 9,
 101         VCPU_REGS_R10 = 10,
 102         VCPU_REGS_R11 = 11,
 103         VCPU_REGS_R12 = 12,
 104         VCPU_REGS_R13 = 13,
 105         VCPU_REGS_R14 = 14,
 106         VCPU_REGS_R15 = 15,
 107 #endif
 108         NR_VCPU_REGS
 109 };
 110
 111 enum {
 112         VCPU_SREG_CS,
 113         VCPU_SREG_DS,
 114         VCPU_SREG_ES,
 115         VCPU_SREG_FS,
 116         VCPU_SREG_GS,
 117         VCPU_SREG_SS,
 118         VCPU_SREG_TR,
 119         VCPU_SREG_LDTR,
 120 };
 121
 122 #include <asm/kvm_x86_emulate.h>
 123
 124 #define KVM_NR_MEM_OBJS 40
 125
 126 struct kvm_guest_debug {
 127         int enabled;
 128         unsigned long bp[4];
 129         int singlestep;
 130 };
 131
 132 /*
 133  * We don't want allocation failures within the mmu code, so we preallocate
 134  * enough memory for a single page fault in a cache.
 135  */
 136 struct kvm_mmu_memory_cache {
 137         int nobjs;
 138         void *objects[KVM_NR_MEM_OBJS];
 139 };
 140
 141 #define NR_PTE_CHAIN_ENTRIES 5
 142
 143 struct kvm_pte_chain {
 144         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 145         struct hlist_node link;
 146 };
 147
 148 /*
 149  * kvm_mmu_page_role, below, is defined as:
 150  *
 151  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 152  *   bits 4:7 - page table level for this shadow (1-4)
 153  *   bits 8:9 - page table quadrant for 2-level guests
 154  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 155  *   bits 17:19 - common access permissions for all ptes in this shadow page
 156  */
 157 union kvm_mmu_page_role {
 158         unsigned word;
 159         struct {
 160                 unsigned glevels:4;
 161                 unsigned level:4;
 162                 unsigned quadrant:2;
 163                 unsigned pad_for_nice_hex_output:6;
 164                 unsigned metaphysical:1;
 165                 unsigned access:3;
 166                 unsigned invalid:1;
 167         };
 168 };
 169
 170 struct kvm_mmu_page {
 171         struct list_head link;
 172         struct hlist_node hash_link;
 173
 174         /*
 175          * The following two entries are used to key the shadow page in the
 176          * hash table.
 177          */
 178         gfn_t gfn;
 179         union kvm_mmu_page_role role;
 180
 181         u64 *spt;
 182         /* hold the gfn of each spte inside spt */
 183         gfn_t *gfns;
 184         unsigned long slot_bitmap; /* One bit set per slot which has memory
 185                                     * in this shadow page.
 186                                     */
 187         int multimapped;         /* More than one parent_pte? */
 188         int root_count;          /* Currently serving as active root */
 189         union {
 190                 u64 *parent_pte;               /* !multimapped */
 191                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 192         };
 193 };
 194
 195 /*
 196  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 197  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 198  * mode.
 199  */
 200 struct kvm_mmu {
 201         void (*new_cr3)(struct kvm_vcpu *vcpu);
 202         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 203         void (*free)(struct kvm_vcpu *vcpu);
 204         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 205         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 206                               struct kvm_mmu_page *page);
 207         hpa_t root_hpa;
 208         int root_level;
 209         int shadow_root_level;
 210
 211         u64 *pae_root;
 212 };
 213
 214 struct kvm_vcpu_arch {
 215         u64 host_tsc;
 216         int interrupt_window_open;
 217         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 218         DECLARE_BITMAP(irq_pending, KVM_NR_INTERRUPTS);
 219         unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
 220         unsigned long rip;      /* needs vcpu_load_rsp_rip() */
 221
 222         unsigned long cr0;
 223         unsigned long cr2;
 224         unsigned long cr3;
 225         unsigned long cr4;
 226         unsigned long cr8;
 227         u64 pdptrs[4]; /* pae */
 228         u64 shadow_efer;
 229         u64 apic_base;
 230         struct kvm_lapic *apic;    /* kernel irqchip context */
 231         int mp_state;
 232         int sipi_vector;
 233         u64 ia32_misc_enable_msr;
 234         bool tpr_access_reporting;
 235
 236         struct kvm_mmu mmu;
 237
 238         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 239         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 240         struct kvm_mmu_memory_cache mmu_page_cache;
 241         struct kvm_mmu_memory_cache mmu_page_header_cache;
 242
 243         gfn_t last_pt_write_gfn;
 244         int   last_pt_write_count;
 245         u64  *last_pte_updated;
 246         gfn_t last_pte_gfn;
 247
 248         struct {
 249                 gfn_t gfn;      /* presumed gfn during guest pte update */
 250                 pfn_t pfn;      /* pfn corresponding to that gfn */
 251                 int largepage;
 252         } update_pte;
 253
 254         struct i387_fxsave_struct host_fx_image;
 255         struct i387_fxsave_struct guest_fx_image;
 256
 257         gva_t mmio_fault_cr2;
 258         struct kvm_pio_request pio;
 259         void *pio_data;
 260
 261         struct kvm_queued_exception {
 262                 bool pending;
 263                 bool has_error_code;
 264                 u8 nr;
 265                 u32 error_code;
 266         } exception;
 267
 268         struct {
 269                 int active;
 270                 u8 save_iopl;
 271                 struct kvm_save_segment {
 272                         u16 selector;
 273                         unsigned long base;
 274                         u32 limit;
 275                         u32 ar;
 276                 } tr, es, ds, fs, gs;
 277         } rmode;
 278         int halt_request; /* real mode on Intel only */
 279
 280         int cpuid_nent;
 281         struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 282         /* emulate context */
 283
 284         struct x86_emulate_ctxt emulate_ctxt;
 285
 286         gpa_t time;
 287         struct pvclock_vcpu_time_info hv_clock;
 288         unsigned int hv_clock_tsc_khz;
 289         unsigned int time_offset;
 290         struct page *time_page;
 291 };
 292
 293 struct kvm_mem_alias {
 294         gfn_t base_gfn;
 295         unsigned long npages;
 296         gfn_t target_gfn;
 297 };
 298
 299 struct kvm_arch{
 300         int naliases;
 301         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 302
 303         unsigned int n_free_mmu_pages;
 304         unsigned int n_requested_mmu_pages;
 305         unsigned int n_alloc_mmu_pages;
 306         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 307         /*
 308          * Hash table of struct kvm_mmu_page.
 309          */
 310         struct list_head active_mmu_pages;
 311         struct kvm_pic *vpic;
 312         struct kvm_ioapic *vioapic;
 313         struct kvm_pit *vpit;
 314
 315         int round_robin_prev_vcpu;
 316         unsigned int tss_addr;
 317         struct page *apic_access_page;
 318
 319         gpa_t wall_clock;
 320
 321         struct page *ept_identity_pagetable;
 322         bool ept_identity_pagetable_done;
 323 };
 324
 325 struct kvm_vm_stat {
 326         u32 mmu_shadow_zapped;
 327         u32 mmu_pte_write;
 328         u32 mmu_pte_updated;
 329         u32 mmu_pde_zapped;
 330         u32 mmu_flooded;
 331         u32 mmu_recycled;
 332         u32 mmu_cache_miss;
 333         u32 remote_tlb_flush;
 334         u32 lpages;
 335 };
 336
 337 struct kvm_vcpu_stat {
 338         u32 pf_fixed;
 339         u32 pf_guest;
 340         u32 tlb_flush;
 341         u32 invlpg;
 342
 343         u32 exits;
 344         u32 io_exits;
 345         u32 mmio_exits;
 346         u32 signal_exits;
 347         u32 irq_window_exits;
 348         u32 halt_exits;
 349         u32 halt_wakeup;
 350         u32 request_irq_exits;
 351         u32 irq_exits;
 352         u32 host_state_reload;
 353         u32 efer_reload;
 354         u32 fpu_reload;
 355         u32 insn_emulation;
 356         u32 insn_emulation_fail;
 357         u32 hypercalls;
 358 };
 359
 360 struct descriptor_table {
 361         u16 limit;
 362         unsigned long base;
 363 } __attribute__((packed));
 364
 365 struct kvm_x86_ops {
 366         int (*cpu_has_kvm_support)(void);          /* __init */
 367         int (*disabled_by_bios)(void);             /* __init */
 368         void (*hardware_enable)(void *dummy);      /* __init */
 369         void (*hardware_disable)(void *dummy);
 370         void (*check_processor_compatibility)(void *rtn);
 371         int (*hardware_setup)(void);               /* __init */
 372         void (*hardware_unsetup)(void);            /* __exit */
 373         bool (*cpu_has_accelerated_tpr)(void);
 374
 375         /* Create, but do not attach this VCPU */
 376         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 377         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 378         int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 379
 380         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 381         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 382         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 383         void (*vcpu_decache)(struct kvm_vcpu *vcpu);
 384
 385         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 386                                struct kvm_debug_guest *dbg);
 387         void (*guest_debug_pre)(struct kvm_vcpu *vcpu);
 388         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 389         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 390         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 391         void (*get_segment)(struct kvm_vcpu *vcpu,
 392                             struct kvm_segment *var, int seg);
 393         int (*get_cpl)(struct kvm_vcpu *vcpu);
 394         void (*set_segment)(struct kvm_vcpu *vcpu,
 395                             struct kvm_segment *var, int seg);
 396         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 397         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 398         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 399         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 400         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 401         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 402         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 403         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 404         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 405         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 406         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 407         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 408                        int *exception);
 409         void (*cache_regs)(struct kvm_vcpu *vcpu);
 410         void (*decache_regs)(struct kvm_vcpu *vcpu);
 411         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 412         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 413
 414         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 415
 416         void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 417         int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 418         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 419         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 420                                 unsigned char *hypercall_addr);
 421         int (*get_irq)(struct kvm_vcpu *vcpu);
 422         void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
 423         void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
 424                                 bool has_error_code, u32 error_code);
 425         bool (*exception_injected)(struct kvm_vcpu *vcpu);
 426         void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
 427         void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
 428                                        struct kvm_run *run);
 429
 430         int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 431         int (*get_tdp_level)(void);
 432 };
 433
 434 extern struct kvm_x86_ops *kvm_x86_ops;
 435
 436 int kvm_mmu_module_init(void);
 437 void kvm_mmu_module_exit(void);
 438
 439 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 440 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 441 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 442 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 443 void kvm_mmu_set_base_ptes(u64 base_pte);
 444 void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
 445                 u64 dirty_mask, u64 nx_mask, u64 x_mask);
 446
 447 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 448 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 449 void kvm_mmu_zap_all(struct kvm *kvm);
 450 unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
 451 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 452
 453 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 454
 455 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 456                           const void *val, int bytes);
 457 int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
 458                   gpa_t addr, unsigned long *ret);
 459
 460 extern bool tdp_enabled;
 461
 462 enum emulation_result {
 463         EMULATE_DONE,       /* no further processing */
 464         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 465         EMULATE_FAIL,         /* can't emulate this instruction */
 466 };
 467
 468 #define EMULTYPE_NO_DECODE          (1 << 0)
 469 #define EMULTYPE_TRAP_UD            (1 << 1)
 470 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 471                         unsigned long cr2, u16 error_code, int emulation_type);
 472 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 473 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 474 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 475 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 476                    unsigned long *rflags);
 477
 478 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 479 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 480                      unsigned long *rflags);
 481 void kvm_enable_efer_bits(u64);
 482 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 483 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 484
 485 struct x86_emulate_ctxt;
 486
 487 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 488                      int size, unsigned port);
 489 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 490                            int size, unsigned long count, int down,
 491                             gva_t address, int rep, unsigned port);
 492 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 493 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 494 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 495 int emulate_clts(struct kvm_vcpu *vcpu);
 496 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 497                     unsigned long *dest);
 498 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 499                     unsigned long value);
 500
 501 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason);
 502
 503 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 504 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
 505 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
 506 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
 507 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu);
 508 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 509 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 510
 511 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 512 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 513
 514 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 515 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 516 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 517                            u32 error_code);
 518
 519 void fx_init(struct kvm_vcpu *vcpu);
 520
 521 int emulator_read_std(unsigned long addr,
 522                       void *val,
 523                       unsigned int bytes,
 524                       struct kvm_vcpu *vcpu);
 525 int emulator_write_emulated(unsigned long addr,
 526                             const void *val,
 527                             unsigned int bytes,
 528                             struct kvm_vcpu *vcpu);
 529
 530 unsigned long segment_base(u16 selector);
 531
 532 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 533 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 534                        const u8 *new, int bytes);
 535 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 536 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 537 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 538 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 539
 540 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 541
 542 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 543
 544 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 545
 546 void kvm_enable_tdp(void);
 547
 548 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 549 int complete_pio(struct kvm_vcpu *vcpu);
 550
 551 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 552 {
 553         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 554
 555         return (struct kvm_mmu_page *)page_private(page);
 556 }
 557
 558 static inline u16 read_fs(void)
 559 {
 560         u16 seg;
 561         asm("mov %%fs, %0" : "=g"(seg));
 562         return seg;
 563 }
 564
 565 static inline u16 read_gs(void)
 566 {
 567         u16 seg;
 568         asm("mov %%gs, %0" : "=g"(seg));
 569         return seg;
 570 }
 571
 572 static inline u16 read_ldt(void)
 573 {
 574         u16 ldt;
 575         asm("sldt %0" : "=g"(ldt));
 576         return ldt;
 577 }
 578
 579 static inline void load_fs(u16 sel)
 580 {
 581         asm("mov %0, %%fs" : : "rm"(sel));
 582 }
 583
 584 static inline void load_gs(u16 sel)
 585 {
 586         asm("mov %0, %%gs" : : "rm"(sel));
 587 }
 588
 589 #ifndef load_ldt
 590 static inline void load_ldt(u16 sel)
 591 {
 592         asm("lldt %0" : : "rm"(sel));
 593 }
 594 #endif
 595
 596 static inline void get_idt(struct descriptor_table *table)
 597 {
 598         asm("sidt %0" : "=m"(*table));
 599 }
 600
 601 static inline void get_gdt(struct descriptor_table *table)
 602 {
 603         asm("sgdt %0" : "=m"(*table));
 604 }
 605
 606 static inline unsigned long read_tr_base(void)
 607 {
 608         u16 tr;
 609         asm("str %0" : "=g"(tr));
 610         return segment_base(tr);
 611 }
 612
 613 #ifdef CONFIG_X86_64
 614 static inline unsigned long read_msr(unsigned long msr)
 615 {
 616         u64 value;
 617
 618         rdmsrl(msr, value);
 619         return value;
 620 }
 621 #endif
 622
 623 static inline void fx_save(struct i387_fxsave_struct *image)
 624 {
 625         asm("fxsave (%0)":: "r" (image));
 626 }
 627
 628 static inline void fx_restore(struct i387_fxsave_struct *image)
 629 {
 630         asm("fxrstor (%0)":: "r" (image));
 631 }
 632
 633 static inline void fx_finit(void)
 634 {
 635         asm("finit");
 636 }
 637
 638 static inline u32 get_rdx_init_val(void)
 639 {
 640         return 0x600; /* P6 family */
 641 }
 642
 643 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 644 {
 645         kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 646 }
 647
 648 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 649 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 650 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 651 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 652 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 653 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 654 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 655 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 656 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 657 #define ASM_VMX_INVEPT            ".byte 0x66, 0x0f, 0x38, 0x80, 0x08"
 658 #define ASM_VMX_INVVPID           ".byte 0x66, 0x0f, 0x38, 0x81, 0x08"
 659
 660 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 661
 662 #define TSS_IOPB_BASE_OFFSET 0x66
 663 #define TSS_BASE_SIZE 0x68
 664 #define TSS_IOPB_SIZE (65536 / 8)
 665 #define TSS_REDIRECTION_SIZE (256 / 8)
 666 #define RMODE_TSS_SIZE                                                  \
 667         (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 668
 669 enum {
 670         TASK_SWITCH_CALL = 0,
 671         TASK_SWITCH_IRET = 1,
 672         TASK_SWITCH_JMP = 2,
 673         TASK_SWITCH_GATE = 3,
 674 };
 675
 676 #define KVMTRACE_5D(evt, vcpu, d1, d2, d3, d4, d5, name) \
 677         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 678                                                 vcpu, 5, d1, d2, d3, d4, d5)
 679 #define KVMTRACE_4D(evt, vcpu, d1, d2, d3, d4, name) \
 680         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 681                                                 vcpu, 4, d1, d2, d3, d4, 0)
 682 #define KVMTRACE_3D(evt, vcpu, d1, d2, d3, name) \
 683         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 684                                                 vcpu, 3, d1, d2, d3, 0, 0)
 685 #define KVMTRACE_2D(evt, vcpu, d1, d2, name) \
 686         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 687                                                 vcpu, 2, d1, d2, 0, 0, 0)
 688 #define KVMTRACE_1D(evt, vcpu, d1, name) \
 689         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 690                                                 vcpu, 1, d1, 0, 0, 0, 0)
 691 #define KVMTRACE_0D(evt, vcpu, name) \
 692         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 693                                                 vcpu, 0, 0, 0, 0, 0, 0)
 694
 695 #ifdef CONFIG_64BIT
 696 #define KVM_EX_ENTRY ".quad"
 697 #else
 698 #define KVM_EX_ENTRY ".long"
 699 #endif
 700
 701 /*
 702  * Hardware virtualization extension instructions may fault if a
 703  * reboot turns off virtualization while processes are running.
 704  * Trap the fault and ignore the instruction if that happens.
 705  */
 706 asmlinkage void kvm_handle_fault_on_reboot(void);
 707
 708 #define __kvm_handle_fault_on_reboot(insn) \
 709         "666: " insn "\n\t" \
 710         ".pushsection .text.fixup, \"ax\" \n" \
 711         "667: \n\t" \
 712         "push $666b \n\t" \
 713         "jmp kvm_handle_fault_on_reboot \n\t" \
 714         ".popsection \n\t" \
 715         ".pushsection __ex_table, \"a\" \n\t" \
 716         KVM_EX_ENTRY " 666b, 667b \n\t" \
 717         ".popsection"
 718
 719 #endif