arch/x86/include/asm/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 #include <asm/mtrr.h>
  25 #include <asm/msr-index.h>
  26
  27 #define KVM_MAX_VCPUS 16
  28 #define KVM_MEMORY_SLOTS 32
  29 /* memory slots that does not exposed to userspace */
  30 #define KVM_PRIVATE_MEM_SLOTS 4
  31
  32 #define KVM_PIO_PAGE_OFFSET 1
  33 #define KVM_COALESCED_MMIO_PAGE_OFFSET 2
  34
  35 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
  36 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
  37 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS |    \
  38                                   0xFFFFFF0000000000ULL)
  39
  40 #define KVM_GUEST_CR0_MASK                                 \
  41         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE \
  42          | X86_CR0_NW | X86_CR0_CD)
  43 #define KVM_VM_CR0_ALWAYS_ON                                            \
  44         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE | X86_CR0_TS \
  45          | X86_CR0_MP)
  46 #define KVM_GUEST_CR4_MASK                                              \
  47         (X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)
  48 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
  49 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
  50
  51 #define INVALID_PAGE (~(hpa_t)0)
  52 #define UNMAPPED_GVA (~(gpa_t)0)
  53
  54 /* shadow tables are PAE even on non-PAE hosts */
  55 #define KVM_HPAGE_SHIFT 21
  56 #define KVM_HPAGE_SIZE (1UL << KVM_HPAGE_SHIFT)
  57 #define KVM_HPAGE_MASK (~(KVM_HPAGE_SIZE - 1))
  58
  59 #define KVM_PAGES_PER_HPAGE (KVM_HPAGE_SIZE / PAGE_SIZE)
  60
  61 #define DE_VECTOR 0
  62 #define DB_VECTOR 1
  63 #define BP_VECTOR 3
  64 #define OF_VECTOR 4
  65 #define BR_VECTOR 5
  66 #define UD_VECTOR 6
  67 #define NM_VECTOR 7
  68 #define DF_VECTOR 8
  69 #define TS_VECTOR 10
  70 #define NP_VECTOR 11
  71 #define SS_VECTOR 12
  72 #define GP_VECTOR 13
  73 #define PF_VECTOR 14
  74 #define MF_VECTOR 16
  75 #define MC_VECTOR 18
  76
  77 #define SELECTOR_TI_MASK (1 << 2)
  78 #define SELECTOR_RPL_MASK 0x03
  79
  80 #define IOPL_SHIFT 12
  81
  82 #define KVM_ALIAS_SLOTS 4
  83
  84 #define KVM_PERMILLE_MMU_PAGES 20
  85 #define KVM_MIN_ALLOC_MMU_PAGES 64
  86 #define KVM_MMU_HASH_SHIFT 10
  87 #define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
  88 #define KVM_MIN_FREE_MMU_PAGES 5
  89 #define KVM_REFILL_PAGES 25
  90 #define KVM_MAX_CPUID_ENTRIES 40
  91 #define KVM_NR_FIXED_MTRR_REGION 88
  92 #define KVM_NR_VAR_MTRR 8
  93
  94 extern spinlock_t kvm_lock;
  95 extern struct list_head vm_list;
  96
  97 struct kvm_vcpu;
  98 struct kvm;
  99
 100 enum kvm_reg {
 101         VCPU_REGS_RAX = 0,
 102         VCPU_REGS_RCX = 1,
 103         VCPU_REGS_RDX = 2,
 104         VCPU_REGS_RBX = 3,
 105         VCPU_REGS_RSP = 4,
 106         VCPU_REGS_RBP = 5,
 107         VCPU_REGS_RSI = 6,
 108         VCPU_REGS_RDI = 7,
 109 #ifdef CONFIG_X86_64
 110         VCPU_REGS_R8 = 8,
 111         VCPU_REGS_R9 = 9,
 112         VCPU_REGS_R10 = 10,
 113         VCPU_REGS_R11 = 11,
 114         VCPU_REGS_R12 = 12,
 115         VCPU_REGS_R13 = 13,
 116         VCPU_REGS_R14 = 14,
 117         VCPU_REGS_R15 = 15,
 118 #endif
 119         VCPU_REGS_RIP,
 120         NR_VCPU_REGS
 121 };
 122
 123 enum {
 124         VCPU_SREG_ES,
 125         VCPU_SREG_CS,
 126         VCPU_SREG_SS,
 127         VCPU_SREG_DS,
 128         VCPU_SREG_FS,
 129         VCPU_SREG_GS,
 130         VCPU_SREG_TR,
 131         VCPU_SREG_LDTR,
 132 };
 133
 134 #include <asm/kvm_x86_emulate.h>
 135
 136 #define KVM_NR_MEM_OBJS 40
 137
 138 #define KVM_NR_DB_REGS  4
 139
 140 #define DR6_BD          (1 << 13)
 141 #define DR6_BS          (1 << 14)
 142 #define DR6_FIXED_1     0xffff0ff0
 143 #define DR6_VOLATILE    0x0000e00f
 144
 145 #define DR7_BP_EN_MASK  0x000000ff
 146 #define DR7_GE          (1 << 9)
 147 #define DR7_GD          (1 << 13)
 148 #define DR7_FIXED_1     0x00000400
 149 #define DR7_VOLATILE    0xffff23ff
 150
 151 /*
 152  * We don't want allocation failures within the mmu code, so we preallocate
 153  * enough memory for a single page fault in a cache.
 154  */
 155 struct kvm_mmu_memory_cache {
 156         int nobjs;
 157         void *objects[KVM_NR_MEM_OBJS];
 158 };
 159
 160 #define NR_PTE_CHAIN_ENTRIES 5
 161
 162 struct kvm_pte_chain {
 163         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 164         struct hlist_node link;
 165 };
 166
 167 /*
 168  * kvm_mmu_page_role, below, is defined as:
 169  *
 170  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 171  *   bits 4:7 - page table level for this shadow (1-4)
 172  *   bits 8:9 - page table quadrant for 2-level guests
 173  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 174  *   bits 17:19 - common access permissions for all ptes in this shadow page
 175  */
 176 union kvm_mmu_page_role {
 177         unsigned word;
 178         struct {
 179                 unsigned glevels:4;
 180                 unsigned level:4;
 181                 unsigned quadrant:2;
 182                 unsigned pad_for_nice_hex_output:6;
 183                 unsigned metaphysical:1;
 184                 unsigned access:3;
 185                 unsigned invalid:1;
 186         };
 187 };
 188
 189 struct kvm_mmu_page {
 190         struct list_head link;
 191         struct hlist_node hash_link;
 192
 193         struct list_head oos_link;
 194
 195         /*
 196          * The following two entries are used to key the shadow page in the
 197          * hash table.
 198          */
 199         gfn_t gfn;
 200         union kvm_mmu_page_role role;
 201
 202         u64 *spt;
 203         /* hold the gfn of each spte inside spt */
 204         gfn_t *gfns;
 205         /*
 206          * One bit set per slot which has memory
 207          * in this shadow page.
 208          */
 209         DECLARE_BITMAP(slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS);
 210         int multimapped;         /* More than one parent_pte? */
 211         int root_count;          /* Currently serving as active root */
 212         bool unsync;
 213         bool global;
 214         unsigned int unsync_children;
 215         union {
 216                 u64 *parent_pte;               /* !multimapped */
 217                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 218         };
 219         DECLARE_BITMAP(unsync_child_bitmap, 512);
 220 };
 221
 222 struct kvm_pv_mmu_op_buffer {
 223         void *ptr;
 224         unsigned len;
 225         unsigned processed;
 226         char buf[512] __aligned(sizeof(long));
 227 };
 228
 229 /*
 230  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 231  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 232  * mode.
 233  */
 234 struct kvm_mmu {
 235         void (*new_cr3)(struct kvm_vcpu *vcpu);
 236         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 237         void (*free)(struct kvm_vcpu *vcpu);
 238         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 239         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 240                               struct kvm_mmu_page *page);
 241         int (*sync_page)(struct kvm_vcpu *vcpu,
 242                          struct kvm_mmu_page *sp);
 243         void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva);
 244         hpa_t root_hpa;
 245         int root_level;
 246         int shadow_root_level;
 247
 248         u64 *pae_root;
 249 };
 250
 251 struct kvm_vcpu_arch {
 252         u64 host_tsc;
 253         int interrupt_window_open;
 254         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 255         DECLARE_BITMAP(irq_pending, KVM_NR_INTERRUPTS);
 256         /*
 257          * rip and regs accesses must go through
 258          * kvm_{register,rip}_{read,write} functions.
 259          */
 260         unsigned long regs[NR_VCPU_REGS];
 261         u32 regs_avail;
 262         u32 regs_dirty;
 263
 264         unsigned long cr0;
 265         unsigned long cr2;
 266         unsigned long cr3;
 267         unsigned long cr4;
 268         unsigned long cr8;
 269         u32 hflags;
 270         u64 pdptrs[4]; /* pae */
 271         u64 shadow_efer;
 272         u64 apic_base;
 273         struct kvm_lapic *apic;    /* kernel irqchip context */
 274         int mp_state;
 275         int sipi_vector;
 276         u64 ia32_misc_enable_msr;
 277         bool tpr_access_reporting;
 278
 279         struct kvm_mmu mmu;
 280         /* only needed in kvm_pv_mmu_op() path, but it's hot so
 281          * put it here to avoid allocation */
 282         struct kvm_pv_mmu_op_buffer mmu_op_buffer;
 283
 284         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 285         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 286         struct kvm_mmu_memory_cache mmu_page_cache;
 287         struct kvm_mmu_memory_cache mmu_page_header_cache;
 288
 289         gfn_t last_pt_write_gfn;
 290         int   last_pt_write_count;
 291         u64  *last_pte_updated;
 292         gfn_t last_pte_gfn;
 293
 294         struct {
 295                 gfn_t gfn;      /* presumed gfn during guest pte update */
 296                 pfn_t pfn;      /* pfn corresponding to that gfn */
 297                 int largepage;
 298                 unsigned long mmu_seq;
 299         } update_pte;
 300
 301         struct i387_fxsave_struct host_fx_image;
 302         struct i387_fxsave_struct guest_fx_image;
 303
 304         gva_t mmio_fault_cr2;
 305         struct kvm_pio_request pio;
 306         void *pio_data;
 307
 308         struct kvm_queued_exception {
 309                 bool pending;
 310                 bool has_error_code;
 311                 u8 nr;
 312                 u32 error_code;
 313         } exception;
 314
 315         struct kvm_queued_interrupt {
 316                 bool pending;
 317                 u8 nr;
 318         } interrupt;
 319
 320         struct {
 321                 int active;
 322                 u8 save_iopl;
 323                 struct kvm_save_segment {
 324                         u16 selector;
 325                         unsigned long base;
 326                         u32 limit;
 327                         u32 ar;
 328                 } tr, es, ds, fs, gs;
 329         } rmode;
 330         int halt_request; /* real mode on Intel only */
 331
 332         int cpuid_nent;
 333         struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 334         /* emulate context */
 335
 336         struct x86_emulate_ctxt emulate_ctxt;
 337
 338         gpa_t time;
 339         struct pvclock_vcpu_time_info hv_clock;
 340         unsigned int hv_clock_tsc_khz;
 341         unsigned int time_offset;
 342         struct page *time_page;
 343
 344         bool nmi_pending;
 345         bool nmi_injected;
 346         bool nmi_window_open;
 347
 348         struct mtrr_state_type mtrr_state;
 349         u32 pat;
 350
 351         int switch_db_regs;
 352         unsigned long host_db[KVM_NR_DB_REGS];
 353         unsigned long host_dr6;
 354         unsigned long host_dr7;
 355         unsigned long db[KVM_NR_DB_REGS];
 356         unsigned long dr6;
 357         unsigned long dr7;
 358         unsigned long eff_db[KVM_NR_DB_REGS];
 359 };
 360
 361 struct kvm_mem_alias {
 362         gfn_t base_gfn;
 363         unsigned long npages;
 364         gfn_t target_gfn;
 365 };
 366
 367 struct kvm_arch{
 368         int naliases;
 369         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 370
 371         unsigned int n_free_mmu_pages;
 372         unsigned int n_requested_mmu_pages;
 373         unsigned int n_alloc_mmu_pages;
 374         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 375         /*
 376          * Hash table of struct kvm_mmu_page.
 377          */
 378         struct list_head active_mmu_pages;
 379         struct list_head assigned_dev_head;
 380         struct list_head oos_global_pages;
 381         struct iommu_domain *iommu_domain;
 382         struct kvm_pic *vpic;
 383         struct kvm_ioapic *vioapic;
 384         struct kvm_pit *vpit;
 385         struct hlist_head irq_ack_notifier_list;
 386         int vapics_in_nmi_mode;
 387
 388         int round_robin_prev_vcpu;
 389         unsigned int tss_addr;
 390         struct page *apic_access_page;
 391
 392         gpa_t wall_clock;
 393
 394         struct page *ept_identity_pagetable;
 395         bool ept_identity_pagetable_done;
 396
 397         unsigned long irq_sources_bitmap;
 398         unsigned long irq_states[KVM_IOAPIC_NUM_PINS];
 399 };
 400
 401 struct kvm_vm_stat {
 402         u32 mmu_shadow_zapped;
 403         u32 mmu_pte_write;
 404         u32 mmu_pte_updated;
 405         u32 mmu_pde_zapped;
 406         u32 mmu_flooded;
 407         u32 mmu_recycled;
 408         u32 mmu_cache_miss;
 409         u32 mmu_unsync;
 410         u32 mmu_unsync_global;
 411         u32 remote_tlb_flush;
 412         u32 lpages;
 413 };
 414
 415 struct kvm_vcpu_stat {
 416         u32 pf_fixed;
 417         u32 pf_guest;
 418         u32 tlb_flush;
 419         u32 invlpg;
 420
 421         u32 exits;
 422         u32 io_exits;
 423         u32 mmio_exits;
 424         u32 signal_exits;
 425         u32 irq_window_exits;
 426         u32 nmi_window_exits;
 427         u32 halt_exits;
 428         u32 halt_wakeup;
 429         u32 request_irq_exits;
 430         u32 request_nmi_exits;
 431         u32 irq_exits;
 432         u32 host_state_reload;
 433         u32 efer_reload;
 434         u32 fpu_reload;
 435         u32 insn_emulation;
 436         u32 insn_emulation_fail;
 437         u32 hypercalls;
 438         u32 irq_injections;
 439         u32 nmi_injections;
 440 };
 441
 442 struct descriptor_table {
 443         u16 limit;
 444         unsigned long base;
 445 } __attribute__((packed));
 446
 447 struct kvm_x86_ops {
 448         int (*cpu_has_kvm_support)(void);          /* __init */
 449         int (*disabled_by_bios)(void);             /* __init */
 450         void (*hardware_enable)(void *dummy);      /* __init */
 451         void (*hardware_disable)(void *dummy);
 452         void (*check_processor_compatibility)(void *rtn);
 453         int (*hardware_setup)(void);               /* __init */
 454         void (*hardware_unsetup)(void);            /* __exit */
 455         bool (*cpu_has_accelerated_tpr)(void);
 456
 457         /* Create, but do not attach this VCPU */
 458         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 459         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 460         int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 461
 462         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 463         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 464         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 465
 466         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 467                                struct kvm_guest_debug *dbg);
 468         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 469         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 470         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 471         void (*get_segment)(struct kvm_vcpu *vcpu,
 472                             struct kvm_segment *var, int seg);
 473         int (*get_cpl)(struct kvm_vcpu *vcpu);
 474         void (*set_segment)(struct kvm_vcpu *vcpu,
 475                             struct kvm_segment *var, int seg);
 476         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 477         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 478         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 479         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 480         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 481         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 482         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 483         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 484         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 485         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 486         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 487         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 488                        int *exception);
 489         void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
 490         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 491         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 492
 493         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 494
 495         void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 496         int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 497         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 498         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 499                                 unsigned char *hypercall_addr);
 500         int (*get_irq)(struct kvm_vcpu *vcpu);
 501         void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
 502         void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
 503                                 bool has_error_code, u32 error_code);
 504         bool (*exception_injected)(struct kvm_vcpu *vcpu);
 505         void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
 506         void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
 507                                        struct kvm_run *run);
 508
 509         int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 510         int (*get_tdp_level)(void);
 511         int (*get_mt_mask_shift)(void);
 512 };
 513
 514 extern struct kvm_x86_ops *kvm_x86_ops;
 515
 516 int kvm_mmu_module_init(void);
 517 void kvm_mmu_module_exit(void);
 518
 519 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 520 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 521 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 522 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 523 void kvm_mmu_set_base_ptes(u64 base_pte);
 524 void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
 525                 u64 dirty_mask, u64 nx_mask, u64 x_mask, u64 mt_mask);
 526
 527 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 528 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 529 void kvm_mmu_zap_all(struct kvm *kvm);
 530 unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
 531 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 532
 533 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 534
 535 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 536                           const void *val, int bytes);
 537 int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
 538                   gpa_t addr, unsigned long *ret);
 539
 540 extern bool tdp_enabled;
 541
 542 enum emulation_result {
 543         EMULATE_DONE,       /* no further processing */
 544         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 545         EMULATE_FAIL,         /* can't emulate this instruction */
 546 };
 547
 548 #define EMULTYPE_NO_DECODE          (1 << 0)
 549 #define EMULTYPE_TRAP_UD            (1 << 1)
 550 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 551                         unsigned long cr2, u16 error_code, int emulation_type);
 552 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 553 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 554 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 555 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 556                    unsigned long *rflags);
 557
 558 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 559 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 560                      unsigned long *rflags);
 561 void kvm_enable_efer_bits(u64);
 562 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 563 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 564
 565 struct x86_emulate_ctxt;
 566
 567 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 568                      int size, unsigned port);
 569 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 570                            int size, unsigned long count, int down,
 571                             gva_t address, int rep, unsigned port);
 572 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 573 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 574 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 575 int emulate_clts(struct kvm_vcpu *vcpu);
 576 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 577                     unsigned long *dest);
 578 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 579                     unsigned long value);
 580
 581 void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 582 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
 583                                 int type_bits, int seg);
 584
 585 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason);
 586
 587 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 588 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
 589 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
 590 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
 591 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu);
 592 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 593 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 594
 595 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 596 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 597
 598 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 599 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 600 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 601                            u32 error_code);
 602
 603 void kvm_pic_set_irq(void *opaque, int irq, int level);
 604
 605 void kvm_inject_nmi(struct kvm_vcpu *vcpu);
 606
 607 void fx_init(struct kvm_vcpu *vcpu);
 608
 609 int emulator_read_std(unsigned long addr,
 610                       void *val,
 611                       unsigned int bytes,
 612                       struct kvm_vcpu *vcpu);
 613 int emulator_write_emulated(unsigned long addr,
 614                             const void *val,
 615                             unsigned int bytes,
 616                             struct kvm_vcpu *vcpu);
 617
 618 unsigned long segment_base(u16 selector);
 619
 620 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 621 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 622                        const u8 *new, int bytes,
 623                        bool guest_initiated);
 624 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 625 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 626 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 627 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 628 void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu);
 629 void kvm_mmu_sync_global(struct kvm_vcpu *vcpu);
 630
 631 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 632
 633 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 634
 635 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 636 void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva);
 637
 638 void kvm_enable_tdp(void);
 639 void kvm_disable_tdp(void);
 640
 641 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 642 int complete_pio(struct kvm_vcpu *vcpu);
 643
 644 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn);
 645
 646 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 647 {
 648         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 649
 650         return (struct kvm_mmu_page *)page_private(page);
 651 }
 652
 653 static inline u16 kvm_read_fs(void)
 654 {
 655         u16 seg;
 656         asm("mov %%fs, %0" : "=g"(seg));
 657         return seg;
 658 }
 659
 660 static inline u16 kvm_read_gs(void)
 661 {
 662         u16 seg;
 663         asm("mov %%gs, %0" : "=g"(seg));
 664         return seg;
 665 }
 666
 667 static inline u16 kvm_read_ldt(void)
 668 {
 669         u16 ldt;
 670         asm("sldt %0" : "=g"(ldt));
 671         return ldt;
 672 }
 673
 674 static inline void kvm_load_fs(u16 sel)
 675 {
 676         asm("mov %0, %%fs" : : "rm"(sel));
 677 }
 678
 679 static inline void kvm_load_gs(u16 sel)
 680 {
 681         asm("mov %0, %%gs" : : "rm"(sel));
 682 }
 683
 684 static inline void kvm_load_ldt(u16 sel)
 685 {
 686         asm("lldt %0" : : "rm"(sel));
 687 }
 688
 689 static inline void kvm_get_idt(struct descriptor_table *table)
 690 {
 691         asm("sidt %0" : "=m"(*table));
 692 }
 693
 694 static inline void kvm_get_gdt(struct descriptor_table *table)
 695 {
 696         asm("sgdt %0" : "=m"(*table));
 697 }
 698
 699 static inline unsigned long kvm_read_tr_base(void)
 700 {
 701         u16 tr;
 702         asm("str %0" : "=g"(tr));
 703         return segment_base(tr);
 704 }
 705
 706 #ifdef CONFIG_X86_64
 707 static inline unsigned long read_msr(unsigned long msr)
 708 {
 709         u64 value;
 710
 711         rdmsrl(msr, value);
 712         return value;
 713 }
 714 #endif
 715
 716 static inline void kvm_fx_save(struct i387_fxsave_struct *image)
 717 {
 718         asm("fxsave (%0)":: "r" (image));
 719 }
 720
 721 static inline void kvm_fx_restore(struct i387_fxsave_struct *image)
 722 {
 723         asm("fxrstor (%0)":: "r" (image));
 724 }
 725
 726 static inline void kvm_fx_finit(void)
 727 {
 728         asm("finit");
 729 }
 730
 731 static inline u32 get_rdx_init_val(void)
 732 {
 733         return 0x600; /* P6 family */
 734 }
 735
 736 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 737 {
 738         kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 739 }
 740
 741 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 742
 743 #define TSS_IOPB_BASE_OFFSET 0x66
 744 #define TSS_BASE_SIZE 0x68
 745 #define TSS_IOPB_SIZE (65536 / 8)
 746 #define TSS_REDIRECTION_SIZE (256 / 8)
 747 #define RMODE_TSS_SIZE                                                  \
 748         (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 749
 750 enum {
 751         TASK_SWITCH_CALL = 0,
 752         TASK_SWITCH_IRET = 1,
 753         TASK_SWITCH_JMP = 2,
 754         TASK_SWITCH_GATE = 3,
 755 };
 756
 757 #define HF_GIF_MASK             (1 << 0)
 758 #define HF_HIF_MASK             (1 << 1)
 759 #define HF_VINTR_MASK           (1 << 2)
 760
 761 /*
 762  * Hardware virtualization extension instructions may fault if a
 763  * reboot turns off virtualization while processes are running.
 764  * Trap the fault and ignore the instruction if that happens.
 765  */
 766 asmlinkage void kvm_handle_fault_on_reboot(void);
 767
 768 #define __kvm_handle_fault_on_reboot(insn) \
 769         "666: " insn "\n\t" \
 770         ".pushsection .fixup, \"ax\" \n" \
 771         "667: \n\t" \
 772         __ASM_SIZE(push) " $666b \n\t"        \
 773         "jmp kvm_handle_fault_on_reboot \n\t" \
 774         ".popsection \n\t" \
 775         ".pushsection __ex_table, \"a\" \n\t" \
 776         _ASM_PTR " 666b, 667b \n\t" \
 777         ".popsection"
 778
 779 #define KVM_ARCH_WANT_MMU_NOTIFIER
 780 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 781 int kvm_age_hva(struct kvm *kvm, unsigned long hva);
 782
 783 #endif /* _ASM_X86_KVM_HOST_H */