LXR linux/arch/x86/include/asm/kvm

   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#include <linux/tracepoint.h>
  18
  19#include <linux/kvm.h>
  20#include <linux/kvm_para.h>
  21#include <linux/kvm_types.h>
  22
  23#include <asm/pvclock-abi.h>
  24#include <asm/desc.h>
  25#include <asm/mtrr.h>
  26#include <asm/msr-index.h>
  27
  28#define KVM_MAX_VCPUS 16
  29#define KVM_MEMORY_SLOTS 32
  30/* memory slots that does not exposed to userspace */
  31#define KVM_PRIVATE_MEM_SLOTS 4
  32
  33#define KVM_PIO_PAGE_OFFSET 1
  34#define KVM_COALESCED_MMIO_PAGE_OFFSET 2
  35
  36#define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
  37#define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
  38#define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS |    \
  39                                  0xFFFFFF0000000000ULL)
  40
  41#define KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST                           \
  42        (X86_CR0_WP | X86_CR0_NE | X86_CR0_NW | X86_CR0_CD)
  43#define KVM_GUEST_CR0_MASK                                              \
  44        (KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
  45#define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST                         \
  46        (X86_CR0_WP | X86_CR0_NE | X86_CR0_TS | X86_CR0_MP)
  47#define KVM_VM_CR0_ALWAYS_ON                                            \
  48        (KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
  49#define KVM_GUEST_CR4_MASK                                              \
  50        (X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)
  51#define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
  52#define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
  53
  54#define INVALID_PAGE (~(hpa_t)0)
  55#define UNMAPPED_GVA (~(gpa_t)0)
  56
  57/* KVM Hugepage definitions for x86 */
  58#define KVM_NR_PAGE_SIZES       3
  59#define KVM_HPAGE_SHIFT(x)      (PAGE_SHIFT + (((x) - 1) * 9))
  60#define KVM_HPAGE_SIZE(x)       (1UL << KVM_HPAGE_SHIFT(x))
  61#define KVM_HPAGE_MASK(x)       (~(KVM_HPAGE_SIZE(x) - 1))
  62#define KVM_PAGES_PER_HPAGE(x)  (KVM_HPAGE_SIZE(x) / PAGE_SIZE)
  63
  64#define DE_VECTOR 0
  65#define DB_VECTOR 1
  66#define BP_VECTOR 3
  67#define OF_VECTOR 4
  68#define BR_VECTOR 5
  69#define UD_VECTOR 6
  70#define NM_VECTOR 7
  71#define DF_VECTOR 8
  72#define TS_VECTOR 10
  73#define NP_VECTOR 11
  74#define SS_VECTOR 12
  75#define GP_VECTOR 13
  76#define PF_VECTOR 14
  77#define MF_VECTOR 16
  78#define MC_VECTOR 18
  79
  80#define SELECTOR_TI_MASK (1 << 2)
  81#define SELECTOR_RPL_MASK 0x03
  82
  83#define IOPL_SHIFT 12
  84
  85#define KVM_ALIAS_SLOTS 4
  86
  87#define KVM_PERMILLE_MMU_PAGES 20
  88#define KVM_MIN_ALLOC_MMU_PAGES 64
  89#define KVM_MMU_HASH_SHIFT 10
  90#define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
  91#define KVM_MIN_FREE_MMU_PAGES 5
  92#define KVM_REFILL_PAGES 25
  93#define KVM_MAX_CPUID_ENTRIES 40
  94#define KVM_NR_FIXED_MTRR_REGION 88
  95#define KVM_NR_VAR_MTRR 8
  96
  97extern spinlock_t kvm_lock;
  98extern struct list_head vm_list;
  99
 100struct kvm_vcpu;
 101struct kvm;
 102
 103enum kvm_reg {
 104        VCPU_REGS_RAX = 0,
 105        VCPU_REGS_RCX = 1,
 106        VCPU_REGS_RDX = 2,
 107        VCPU_REGS_RBX = 3,
 108        VCPU_REGS_RSP = 4,
 109        VCPU_REGS_RBP = 5,
 110        VCPU_REGS_RSI = 6,
 111        VCPU_REGS_RDI = 7,
 112#ifdef CONFIG_X86_64
 113        VCPU_REGS_R8 = 8,
 114        VCPU_REGS_R9 = 9,
 115        VCPU_REGS_R10 = 10,
 116        VCPU_REGS_R11 = 11,
 117        VCPU_REGS_R12 = 12,
 118        VCPU_REGS_R13 = 13,
 119        VCPU_REGS_R14 = 14,
 120        VCPU_REGS_R15 = 15,
 121#endif
 122        VCPU_REGS_RIP,
 123        NR_VCPU_REGS
 124};
 125
 126enum kvm_reg_ex {
 127        VCPU_EXREG_PDPTR = NR_VCPU_REGS,
 128};
 129
 130enum {
 131        VCPU_SREG_ES,
 132        VCPU_SREG_CS,
 133        VCPU_SREG_SS,
 134        VCPU_SREG_DS,
 135        VCPU_SREG_FS,
 136        VCPU_SREG_GS,
 137        VCPU_SREG_TR,
 138        VCPU_SREG_LDTR,
 139};
 140
 141#include <asm/kvm_emulate.h>
 142
 143#define KVM_NR_MEM_OBJS 40
 144
 145#define KVM_NR_DB_REGS  4
 146
 147#define DR6_BD          (1 << 13)
 148#define DR6_BS          (1 << 14)
 149#define DR6_FIXED_1     0xffff0ff0
 150#define DR6_VOLATILE    0x0000e00f
 151
 152#define DR7_BP_EN_MASK  0x000000ff
 153#define DR7_GE          (1 << 9)
 154#define DR7_GD          (1 << 13)
 155#define DR7_FIXED_1     0x00000400
 156#define DR7_VOLATILE    0xffff23ff
 157
 158/*
 159 * We don't want allocation failures within the mmu code, so we preallocate
 160 * enough memory for a single page fault in a cache.
 161 */
 162struct kvm_mmu_memory_cache {
 163        int nobjs;
 164        void *objects[KVM_NR_MEM_OBJS];
 165};
 166
 167#define NR_PTE_CHAIN_ENTRIES 5
 168
 169struct kvm_pte_chain {
 170        u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 171        struct hlist_node link;
 172};
 173
 174/*
 175 * kvm_mmu_page_role, below, is defined as:
 176 *
 177 *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 178 *   bits 4:7 - page table level for this shadow (1-4)
 179 *   bits 8:9 - page table quadrant for 2-level guests
 180 *   bit   16 - direct mapping of virtual to physical mapping at gfn
 181 *              used for real mode and two-dimensional paging
 182 *   bits 17:19 - common access permissions for all ptes in this shadow page
 183 */
 184union kvm_mmu_page_role {
 185        unsigned word;
 186        struct {
 187                unsigned glevels:4;
 188                unsigned level:4;
 189                unsigned quadrant:2;
 190                unsigned pad_for_nice_hex_output:6;
 191                unsigned direct:1;
 192                unsigned access:3;
 193                unsigned invalid:1;
 194                unsigned cr4_pge:1;
 195                unsigned nxe:1;
 196        };
 197};
 198
 199struct kvm_mmu_page {
 200        struct list_head link;
 201        struct hlist_node hash_link;
 202
 203        struct list_head oos_link;
 204
 205        /*
 206         * The following two entries are used to key the shadow page in the
 207         * hash table.
 208         */
 209        gfn_t gfn;
 210        union kvm_mmu_page_role role;
 211
 212        u64 *spt;
 213        /* hold the gfn of each spte inside spt */
 214        gfn_t *gfns;
 215        /*
 216         * One bit set per slot which has memory
 217         * in this shadow page.
 218         */
 219        DECLARE_BITMAP(slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS);
 220        int multimapped;         /* More than one parent_pte? */
 221        int root_count;          /* Currently serving as active root */
 222        bool unsync;
 223        unsigned int unsync_children;
 224        union {
 225                u64 *parent_pte;               /* !multimapped */
 226                struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 227        };
 228        DECLARE_BITMAP(unsync_child_bitmap, 512);
 229};
 230
 231struct kvm_pv_mmu_op_buffer {
 232        void *ptr;
 233        unsigned len;
 234        unsigned processed;
 235        char buf[512] __aligned(sizeof(long));
 236};
 237
 238struct kvm_pio_request {
 239        unsigned long count;
 240        int cur_count;
 241        gva_t guest_gva;
 242        int in;
 243        int port;
 244        int size;
 245        int string;
 246        int down;
 247        int rep;
 248};
 249
 250/*
 251 * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 252 * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 253 * mode.
 254 */
 255struct kvm_mmu {
 256        void (*new_cr3)(struct kvm_vcpu *vcpu);
 257        int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 258        void (*free)(struct kvm_vcpu *vcpu);
 259        gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 260        void (*prefetch_page)(struct kvm_vcpu *vcpu,
 261                              struct kvm_mmu_page *page);
 262        int (*sync_page)(struct kvm_vcpu *vcpu,
 263                         struct kvm_mmu_page *sp);
 264        void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva);
 265        hpa_t root_hpa;
 266        int root_level;
 267        int shadow_root_level;
 268        union kvm_mmu_page_role base_role;
 269
 270        u64 *pae_root;
 271        u64 rsvd_bits_mask[2][4];
 272};
 273
 274struct kvm_vcpu_arch {
 275        u64 host_tsc;
 276        /*
 277         * rip and regs accesses must go through
 278         * kvm_{register,rip}_{read,write} functions.
 279         */
 280        unsigned long regs[NR_VCPU_REGS];
 281        u32 regs_avail;
 282        u32 regs_dirty;
 283
 284        unsigned long cr0;
 285        unsigned long cr2;
 286        unsigned long cr3;
 287        unsigned long cr4;
 288        unsigned long cr8;
 289        u32 hflags;
 290        u64 pdptrs[4]; /* pae */
 291        u64 shadow_efer;
 292        u64 apic_base;
 293        struct kvm_lapic *apic;    /* kernel irqchip context */
 294        int32_t apic_arb_prio;
 295        int mp_state;
 296        int sipi_vector;
 297        u64 ia32_misc_enable_msr;
 298        bool tpr_access_reporting;
 299
 300        struct kvm_mmu mmu;
 301        /* only needed in kvm_pv_mmu_op() path, but it's hot so
 302         * put it here to avoid allocation */
 303        struct kvm_pv_mmu_op_buffer mmu_op_buffer;
 304
 305        struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 306        struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 307        struct kvm_mmu_memory_cache mmu_page_cache;
 308        struct kvm_mmu_memory_cache mmu_page_header_cache;
 309
 310        gfn_t last_pt_write_gfn;
 311        int   last_pt_write_count;
 312        u64  *last_pte_updated;
 313        gfn_t last_pte_gfn;
 314
 315        struct {
 316                gfn_t gfn;      /* presumed gfn during guest pte update */
 317                pfn_t pfn;      /* pfn corresponding to that gfn */
 318                unsigned long mmu_seq;
 319        } update_pte;
 320
 321        struct i387_fxsave_struct host_fx_image;
 322        struct i387_fxsave_struct guest_fx_image;
 323
 324        gva_t mmio_fault_cr2;
 325        struct kvm_pio_request pio;
 326        void *pio_data;
 327
 328        u8 event_exit_inst_len;
 329
 330        struct kvm_queued_exception {
 331                bool pending;
 332                bool has_error_code;
 333                u8 nr;
 334                u32 error_code;
 335        } exception;
 336
 337        struct kvm_queued_interrupt {
 338                bool pending;
 339                bool soft;
 340                u8 nr;
 341        } interrupt;
 342
 343        int halt_request; /* real mode on Intel only */
 344
 345        int cpuid_nent;
 346        struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 347        /* emulate context */
 348
 349        struct x86_emulate_ctxt emulate_ctxt;
 350
 351        gpa_t time;
 352        struct pvclock_vcpu_time_info hv_clock;
 353        unsigned int hv_clock_tsc_khz;
 354        unsigned int time_offset;
 355        struct page *time_page;
 356
 357        bool singlestep; /* guest is single stepped by KVM */
 358        bool nmi_pending;
 359        bool nmi_injected;
 360
 361        struct mtrr_state_type mtrr_state;
 362        u32 pat;
 363
 364        int switch_db_regs;
 365        unsigned long db[KVM_NR_DB_REGS];
 366        unsigned long dr6;
 367        unsigned long dr7;
 368        unsigned long eff_db[KVM_NR_DB_REGS];
 369
 370        u64 mcg_cap;
 371        u64 mcg_status;
 372        u64 mcg_ctl;
 373        u64 *mce_banks;
 374};
 375
 376struct kvm_mem_alias {
 377        gfn_t base_gfn;
 378        unsigned long npages;
 379        gfn_t target_gfn;
 380};
 381
 382struct kvm_arch{
 383        int naliases;
 384        struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 385
 386        unsigned int n_free_mmu_pages;
 387        unsigned int n_requested_mmu_pages;
 388        unsigned int n_alloc_mmu_pages;
 389        struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 390        /*
 391         * Hash table of struct kvm_mmu_page.
 392         */
 393        struct list_head active_mmu_pages;
 394        struct list_head assigned_dev_head;
 395        struct iommu_domain *iommu_domain;
 396        int iommu_flags;
 397        struct kvm_pic *vpic;
 398        struct kvm_ioapic *vioapic;
 399        struct kvm_pit *vpit;
 400        struct hlist_head irq_ack_notifier_list;
 401        int vapics_in_nmi_mode;
 402
 403        unsigned int tss_addr;
 404        struct page *apic_access_page;
 405
 406        gpa_t wall_clock;
 407
 408        struct page *ept_identity_pagetable;
 409        bool ept_identity_pagetable_done;
 410        gpa_t ept_identity_map_addr;
 411
 412        unsigned long irq_sources_bitmap;
 413        unsigned long irq_states[KVM_IOAPIC_NUM_PINS];
 414        u64 vm_init_tsc;
 415};
 416
 417struct kvm_vm_stat {
 418        u32 mmu_shadow_zapped;
 419        u32 mmu_pte_write;
 420        u32 mmu_pte_updated;
 421        u32 mmu_pde_zapped;
 422        u32 mmu_flooded;
 423        u32 mmu_recycled;
 424        u32 mmu_cache_miss;
 425        u32 mmu_unsync;
 426        u32 remote_tlb_flush;
 427        u32 lpages;
 428};
 429
 430struct kvm_vcpu_stat {
 431        u32 pf_fixed;
 432        u32 pf_guest;
 433        u32 tlb_flush;
 434        u32 invlpg;
 435
 436        u32 exits;
 437        u32 io_exits;
 438        u32 mmio_exits;
 439        u32 signal_exits;
 440        u32 irq_window_exits;
 441        u32 nmi_window_exits;
 442        u32 halt_exits;
 443        u32 halt_wakeup;
 444        u32 request_irq_exits;
 445        u32 irq_exits;
 446        u32 host_state_reload;
 447        u32 efer_reload;
 448        u32 fpu_reload;
 449        u32 insn_emulation;
 450        u32 insn_emulation_fail;
 451        u32 hypercalls;
 452        u32 irq_injections;
 453        u32 nmi_injections;
 454};
 455
 456struct descriptor_table {
 457        u16 limit;
 458        unsigned long base;
 459} __attribute__((packed));
 460
 461struct kvm_x86_ops {
 462        int (*cpu_has_kvm_support)(void);          /* __init */
 463        int (*disabled_by_bios)(void);             /* __init */
 464        void (*hardware_enable)(void *dummy);      /* __init */
 465        void (*hardware_disable)(void *dummy);
 466        void (*check_processor_compatibility)(void *rtn);
 467        int (*hardware_setup)(void);               /* __init */
 468        void (*hardware_unsetup)(void);            /* __exit */
 469        bool (*cpu_has_accelerated_tpr)(void);
 470
 471        /* Create, but do not attach this VCPU */
 472        struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 473        void (*vcpu_free)(struct kvm_vcpu *vcpu);
 474        int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 475
 476        void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 477        void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 478        void (*vcpu_put)(struct kvm_vcpu *vcpu);
 479
 480        int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 481                               struct kvm_guest_debug *dbg);
 482        int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 483        int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 484        u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 485        void (*get_segment)(struct kvm_vcpu *vcpu,
 486                            struct kvm_segment *var, int seg);
 487        int (*get_cpl)(struct kvm_vcpu *vcpu);
 488        void (*set_segment)(struct kvm_vcpu *vcpu,
 489                            struct kvm_segment *var, int seg);
 490        void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 491        void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 492        void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 493        void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 494        void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 495        void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 496        void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 497        void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 498        void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 499        void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 500        unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 501        void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 502                       int *exception);
 503        void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
 504        unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 505        void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 506
 507        void (*tlb_flush)(struct kvm_vcpu *vcpu);
 508
 509        void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 510        int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 511        void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 512        void (*set_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
 513        u32 (*get_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
 514        void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 515                                unsigned char *hypercall_addr);
 516        void (*set_irq)(struct kvm_vcpu *vcpu);
 517        void (*set_nmi)(struct kvm_vcpu *vcpu);
 518        void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
 519                                bool has_error_code, u32 error_code);
 520        int (*interrupt_allowed)(struct kvm_vcpu *vcpu);
 521        int (*nmi_allowed)(struct kvm_vcpu *vcpu);
 522        void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
 523        void (*enable_irq_window)(struct kvm_vcpu *vcpu);
 524        void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
 525        int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 526        int (*get_tdp_level)(void);
 527        u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
 528        bool (*gb_page_enable)(void);
 529
 530        const struct trace_print_flags *exit_reasons_str;
 531};
 532
 533extern struct kvm_x86_ops *kvm_x86_ops;
 534
 535int kvm_mmu_module_init(void);
 536void kvm_mmu_module_exit(void);
 537
 538void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 539int kvm_mmu_create(struct kvm_vcpu *vcpu);
 540int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 541void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 542void kvm_mmu_set_base_ptes(u64 base_pte);
 543void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
 544                u64 dirty_mask, u64 nx_mask, u64 x_mask);
 545
 546int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 547void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 548void kvm_mmu_zap_all(struct kvm *kvm);
 549unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
 550void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 551
 552int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 553
 554int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 555                          const void *val, int bytes);
 556int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
 557                  gpa_t addr, unsigned long *ret);
 558u8 kvm_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn);
 559
 560extern bool tdp_enabled;
 561
 562enum emulation_result {
 563        EMULATE_DONE,       /* no further processing */
 564        EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 565        EMULATE_FAIL,         /* can't emulate this instruction */
 566};
 567
 568#define EMULTYPE_NO_DECODE          (1 << 0)
 569#define EMULTYPE_TRAP_UD            (1 << 1)
 570#define EMULTYPE_SKIP               (1 << 2)
 571int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 572                        unsigned long cr2, u16 error_code, int emulation_type);
 573void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 574void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 575void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 576void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 577                   unsigned long *rflags);
 578
 579unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 580void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 581                     unsigned long *rflags);
 582void kvm_enable_efer_bits(u64);
 583int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 584int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 585
 586struct x86_emulate_ctxt;
 587
 588int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 589                     int size, unsigned port);
 590int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 591                           int size, unsigned long count, int down,
 592                            gva_t address, int rep, unsigned port);
 593void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 594int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 595int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 596int emulate_clts(struct kvm_vcpu *vcpu);
 597int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 598                    unsigned long *dest);
 599int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 600                    unsigned long value);
 601
 602void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 603int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
 604                                int type_bits, int seg);
 605
 606int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason);
 607
 608void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 609void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
 610void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
 611void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
 612unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu);
 613void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 614void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 615
 616int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 617int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 618
 619void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 620void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 621void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 622                           u32 error_code);
 623bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl);
 624
 625int kvm_pic_set_irq(void *opaque, int irq, int level);
 626
 627void kvm_inject_nmi(struct kvm_vcpu *vcpu);
 628
 629void fx_init(struct kvm_vcpu *vcpu);
 630
 631int emulator_write_emulated(unsigned long addr,
 632                            const void *val,
 633                            unsigned int bytes,
 634                            struct kvm_vcpu *vcpu);
 635
 636unsigned long segment_base(u16 selector);
 637
 638void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 639void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 640                       const u8 *new, int bytes,
 641                       bool guest_initiated);
 642int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 643void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 644int kvm_mmu_load(struct kvm_vcpu *vcpu);
 645void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 646void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu);
 647
 648int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 649
 650int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 651
 652int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 653void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva);
 654
 655void kvm_enable_tdp(void);
 656void kvm_disable_tdp(void);
 657
 658int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 659int complete_pio(struct kvm_vcpu *vcpu);
 660
 661struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn);
 662
 663static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 664{
 665        struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 666
 667        return (struct kvm_mmu_page *)page_private(page);
 668}
 669
 670static inline u16 kvm_read_fs(void)
 671{
 672        u16 seg;
 673        asm("mov %%fs, %0" : "=g"(seg));
 674        return seg;
 675}
 676
 677static inline u16 kvm_read_gs(void)
 678{
 679        u16 seg;
 680        asm("mov %%gs, %0" : "=g"(seg));
 681        return seg;
 682}
 683
 684static inline u16 kvm_read_ldt(void)
 685{
 686        u16 ldt;
 687        asm("sldt %0" : "=g"(ldt));
 688        return ldt;
 689}
 690
 691static inline void kvm_load_fs(u16 sel)
 692{
 693        asm("mov %0, %%fs" : : "rm"(sel));
 694}
 695
 696static inline void kvm_load_gs(u16 sel)
 697{
 698        asm("mov %0, %%gs" : : "rm"(sel));
 699}
 700
 701static inline void kvm_load_ldt(u16 sel)
 702{
 703        asm("lldt %0" : : "rm"(sel));
 704}
 705
 706static inline void kvm_get_idt(struct descriptor_table *table)
 707{
 708        asm("sidt %0" : "=m"(*table));
 709}
 710
 711static inline void kvm_get_gdt(struct descriptor_table *table)
 712{
 713        asm("sgdt %0" : "=m"(*table));
 714}
 715
 716static inline unsigned long kvm_read_tr_base(void)
 717{
 718        u16 tr;
 719        asm("str %0" : "=g"(tr));
 720        return segment_base(tr);
 721}
 722
 723#ifdef CONFIG_X86_64
 724static inline unsigned long read_msr(unsigned long msr)
 725{
 726        u64 value;
 727
 728        rdmsrl(msr, value);
 729        return value;
 730}
 731#endif
 732
 733static inline void kvm_fx_save(struct i387_fxsave_struct *image)
 734{
 735        asm("fxsave (%0)":: "r" (image));
 736}
 737
 738static inline void kvm_fx_restore(struct i387_fxsave_struct *image)
 739{
 740        asm("fxrstor (%0)":: "r" (image));
 741}
 742
 743static inline void kvm_fx_finit(void)
 744{
 745        asm("finit");
 746}
 747
 748static inline u32 get_rdx_init_val(void)
 749{
 750        return 0x600; /* P6 family */
 751}
 752
 753static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 754{
 755        kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 756}
 757
 758#define TSS_IOPB_BASE_OFFSET 0x66
 759#define TSS_BASE_SIZE 0x68
 760#define TSS_IOPB_SIZE (65536 / 8)
 761#define TSS_REDIRECTION_SIZE (256 / 8)
 762#define RMODE_TSS_SIZE                                                  \
 763        (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 764
 765enum {
 766        TASK_SWITCH_CALL = 0,
 767        TASK_SWITCH_IRET = 1,
 768        TASK_SWITCH_JMP = 2,
 769        TASK_SWITCH_GATE = 3,
 770};
 771
 772#define HF_GIF_MASK             (1 << 0)
 773#define HF_HIF_MASK             (1 << 1)
 774#define HF_VINTR_MASK           (1 << 2)
 775#define HF_NMI_MASK             (1 << 3)
 776#define HF_IRET_MASK            (1 << 4)
 777
 778/*
 779 * Hardware virtualization extension instructions may fault if a
 780 * reboot turns off virtualization while processes are running.
 781 * Trap the fault and ignore the instruction if that happens.
 782 */
 783asmlinkage void kvm_handle_fault_on_reboot(void);
 784
 785#define __kvm_handle_fault_on_reboot(insn) \
 786        "666: " insn "\n\t" \
 787        ".pushsection .fixup, \"ax\" \n" \
 788        "667: \n\t" \
 789        __ASM_SIZE(push) " $666b \n\t"        \
 790        "jmp kvm_handle_fault_on_reboot \n\t" \
 791        ".popsection \n\t" \
 792        ".pushsection __ex_table, \"a\" \n\t" \
 793        _ASM_PTR " 666b, 667b \n\t" \
 794        ".popsection"
 795
 796#define KVM_ARCH_WANT_MMU_NOTIFIER
 797int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 798int kvm_age_hva(struct kvm *kvm, unsigned long hva);
 799void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 800int cpuid_maxphyaddr(struct kvm_vcpu *vcpu);
 801int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);
 802int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);
 803int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
 804
 805#endif /* _ASM_X86_KVM_HOST_H */
 806