drivers/kvm/kvm.h

   1 #ifndef __KVM_H
   2 #define __KVM_H
   3
   4 /*
   5  * This work is licensed under the terms of the GNU GPL, version 2.  See
   6  * the COPYING file in the top-level directory.
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/list.h>
  11 #include <linux/mutex.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/mm.h>
  14 #include <asm/signal.h>
  15
  16 #include "vmx.h"
  17 #include <linux/kvm.h>
  18 #include <linux/kvm_para.h>
  19
  20 #define CR0_PE_MASK (1ULL << 0)
  21 #define CR0_TS_MASK (1ULL << 3)
  22 #define CR0_NE_MASK (1ULL << 5)
  23 #define CR0_WP_MASK (1ULL << 16)
  24 #define CR0_NW_MASK (1ULL << 29)
  25 #define CR0_CD_MASK (1ULL << 30)
  26 #define CR0_PG_MASK (1ULL << 31)
  27
  28 #define CR3_WPT_MASK (1ULL << 3)
  29 #define CR3_PCD_MASK (1ULL << 4)
  30
  31 #define CR3_RESEVED_BITS 0x07ULL
  32 #define CR3_L_MODE_RESEVED_BITS (~((1ULL << 40) - 1) | 0x0fe7ULL)
  33 #define CR3_FLAGS_MASK ((1ULL << 5) - 1)
  34
  35 #define CR4_VME_MASK (1ULL << 0)
  36 #define CR4_PSE_MASK (1ULL << 4)
  37 #define CR4_PAE_MASK (1ULL << 5)
  38 #define CR4_PGE_MASK (1ULL << 7)
  39 #define CR4_VMXE_MASK (1ULL << 13)
  40
  41 #define KVM_GUEST_CR0_MASK \
  42         (CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK \
  43          | CR0_NW_MASK | CR0_CD_MASK)
  44 #define KVM_VM_CR0_ALWAYS_ON \
  45         (CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK)
  46 #define KVM_GUEST_CR4_MASK \
  47         (CR4_PSE_MASK | CR4_PAE_MASK | CR4_PGE_MASK | CR4_VMXE_MASK | CR4_VME_MASK)
  48 #define KVM_PMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK)
  49 #define KVM_RMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK | CR4_VME_MASK)
  50
  51 #define INVALID_PAGE (~(hpa_t)0)
  52 #define UNMAPPED_GVA (~(gpa_t)0)
  53
  54 #define KVM_MAX_VCPUS 1
  55 #define KVM_ALIAS_SLOTS 4
  56 #define KVM_MEMORY_SLOTS 4
  57 #define KVM_NUM_MMU_PAGES 256
  58 #define KVM_MIN_FREE_MMU_PAGES 5
  59 #define KVM_REFILL_PAGES 25
  60 #define KVM_MAX_CPUID_ENTRIES 40
  61
  62 #define FX_IMAGE_SIZE 512
  63 #define FX_IMAGE_ALIGN 16
  64 #define FX_BUF_SIZE (2 * FX_IMAGE_SIZE + FX_IMAGE_ALIGN)
  65
  66 #define DE_VECTOR 0
  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
  75 #define SELECTOR_TI_MASK (1 << 2)
  76 #define SELECTOR_RPL_MASK 0x03
  77
  78 #define IOPL_SHIFT 12
  79
  80 #define KVM_PIO_PAGE_OFFSET 1
  81
  82 /*
  83  * Address types:
  84  *
  85  *  gva - guest virtual address
  86  *  gpa - guest physical address
  87  *  gfn - guest frame number
  88  *  hva - host virtual address
  89  *  hpa - host physical address
  90  *  hfn - host frame number
  91  */
  92
  93 typedef unsigned long  gva_t;
  94 typedef u64            gpa_t;
  95 typedef unsigned long  gfn_t;
  96
  97 typedef unsigned long  hva_t;
  98 typedef u64            hpa_t;
  99 typedef unsigned long  hfn_t;
 100
 101 #define NR_PTE_CHAIN_ENTRIES 5
 102
 103 struct kvm_pte_chain {
 104         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 105         struct hlist_node link;
 106 };
 107
 108 /*
 109  * kvm_mmu_page_role, below, is defined as:
 110  *
 111  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 112  *   bits 4:7 - page table level for this shadow (1-4)
 113  *   bits 8:9 - page table quadrant for 2-level guests
 114  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 115  *   bits 17:18 - "access" - the user and writable bits of a huge page pde
 116  */
 117 union kvm_mmu_page_role {
 118         unsigned word;
 119         struct {
 120                 unsigned glevels : 4;
 121                 unsigned level : 4;
 122                 unsigned quadrant : 2;
 123                 unsigned pad_for_nice_hex_output : 6;
 124                 unsigned metaphysical : 1;
 125                 unsigned hugepage_access : 2;
 126         };
 127 };
 128
 129 struct kvm_mmu_page {
 130         struct list_head link;
 131         struct hlist_node hash_link;
 132
 133         /*
 134          * The following two entries are used to key the shadow page in the
 135          * hash table.
 136          */
 137         gfn_t gfn;
 138         union kvm_mmu_page_role role;
 139
 140         hpa_t page_hpa;
 141         unsigned long slot_bitmap; /* One bit set per slot which has memory
 142                                     * in this shadow page.
 143                                     */
 144         int multimapped;         /* More than one parent_pte? */
 145         int root_count;          /* Currently serving as active root */
 146         union {
 147                 u64 *parent_pte;               /* !multimapped */
 148                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 149         };
 150 };
 151
 152 struct vmcs {
 153         u32 revision_id;
 154         u32 abort;
 155         char data[0];
 156 };
 157
 158 #define vmx_msr_entry kvm_msr_entry
 159
 160 struct kvm_vcpu;
 161
 162 /*
 163  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 164  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 165  * mode.
 166  */
 167 struct kvm_mmu {
 168         void (*new_cr3)(struct kvm_vcpu *vcpu);
 169         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 170         void (*free)(struct kvm_vcpu *vcpu);
 171         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 172         hpa_t root_hpa;
 173         int root_level;
 174         int shadow_root_level;
 175
 176         u64 *pae_root;
 177 };
 178
 179 #define KVM_NR_MEM_OBJS 20
 180
 181 struct kvm_mmu_memory_cache {
 182         int nobjs;
 183         void *objects[KVM_NR_MEM_OBJS];
 184 };
 185
 186 /*
 187  * We don't want allocation failures within the mmu code, so we preallocate
 188  * enough memory for a single page fault in a cache.
 189  */
 190 struct kvm_guest_debug {
 191         int enabled;
 192         unsigned long bp[4];
 193         int singlestep;
 194 };
 195
 196 enum {
 197         VCPU_REGS_RAX = 0,
 198         VCPU_REGS_RCX = 1,
 199         VCPU_REGS_RDX = 2,
 200         VCPU_REGS_RBX = 3,
 201         VCPU_REGS_RSP = 4,
 202         VCPU_REGS_RBP = 5,
 203         VCPU_REGS_RSI = 6,
 204         VCPU_REGS_RDI = 7,
 205 #ifdef CONFIG_X86_64
 206         VCPU_REGS_R8 = 8,
 207         VCPU_REGS_R9 = 9,
 208         VCPU_REGS_R10 = 10,
 209         VCPU_REGS_R11 = 11,
 210         VCPU_REGS_R12 = 12,
 211         VCPU_REGS_R13 = 13,
 212         VCPU_REGS_R14 = 14,
 213         VCPU_REGS_R15 = 15,
 214 #endif
 215         NR_VCPU_REGS
 216 };
 217
 218 enum {
 219         VCPU_SREG_CS,
 220         VCPU_SREG_DS,
 221         VCPU_SREG_ES,
 222         VCPU_SREG_FS,
 223         VCPU_SREG_GS,
 224         VCPU_SREG_SS,
 225         VCPU_SREG_TR,
 226         VCPU_SREG_LDTR,
 227 };
 228
 229 struct kvm_pio_request {
 230         unsigned long count;
 231         int cur_count;
 232         struct page *guest_pages[2];
 233         unsigned guest_page_offset;
 234         int in;
 235         int size;
 236         int string;
 237         int down;
 238         int rep;
 239 };
 240
 241 struct kvm_stat {
 242         u32 pf_fixed;
 243         u32 pf_guest;
 244         u32 tlb_flush;
 245         u32 invlpg;
 246
 247         u32 exits;
 248         u32 io_exits;
 249         u32 mmio_exits;
 250         u32 signal_exits;
 251         u32 irq_window_exits;
 252         u32 halt_exits;
 253         u32 request_irq_exits;
 254         u32 irq_exits;
 255 };
 256
 257 struct kvm_vcpu {
 258         struct kvm *kvm;
 259         union {
 260                 struct vmcs *vmcs;
 261                 struct vcpu_svm *svm;
 262         };
 263         struct mutex mutex;
 264         int   cpu;
 265         int   launched;
 266         u64 host_tsc;
 267         struct kvm_run *run;
 268         int interrupt_window_open;
 269         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 270 #define NR_IRQ_WORDS KVM_IRQ_BITMAP_SIZE(unsigned long)
 271         unsigned long irq_pending[NR_IRQ_WORDS];
 272         unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
 273         unsigned long rip;      /* needs vcpu_load_rsp_rip() */
 274
 275         unsigned long cr0;
 276         unsigned long cr2;
 277         unsigned long cr3;
 278         gpa_t para_state_gpa;
 279         struct page *para_state_page;
 280         gpa_t hypercall_gpa;
 281         unsigned long cr4;
 282         unsigned long cr8;
 283         u64 pdptrs[4]; /* pae */
 284         u64 shadow_efer;
 285         u64 apic_base;
 286         u64 ia32_misc_enable_msr;
 287         int nmsrs;
 288         struct vmx_msr_entry *guest_msrs;
 289         struct vmx_msr_entry *host_msrs;
 290
 291         struct list_head free_pages;
 292         struct kvm_mmu_page page_header_buf[KVM_NUM_MMU_PAGES];
 293         struct kvm_mmu mmu;
 294
 295         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 296         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 297
 298         gfn_t last_pt_write_gfn;
 299         int   last_pt_write_count;
 300
 301         struct kvm_guest_debug guest_debug;
 302
 303         char fx_buf[FX_BUF_SIZE];
 304         char *host_fx_image;
 305         char *guest_fx_image;
 306         int fpu_active;
 307
 308         int mmio_needed;
 309         int mmio_read_completed;
 310         int mmio_is_write;
 311         int mmio_size;
 312         unsigned char mmio_data[8];
 313         gpa_t mmio_phys_addr;
 314         gva_t mmio_fault_cr2;
 315         struct kvm_pio_request pio;
 316         void *pio_data;
 317
 318         int sigset_active;
 319         sigset_t sigset;
 320
 321         struct kvm_stat stat;
 322
 323         struct {
 324                 int active;
 325                 u8 save_iopl;
 326                 struct kvm_save_segment {
 327                         u16 selector;
 328                         unsigned long base;
 329                         u32 limit;
 330                         u32 ar;
 331                 } tr, es, ds, fs, gs;
 332         } rmode;
 333
 334         int cpuid_nent;
 335         struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 336 };
 337
 338 struct kvm_mem_alias {
 339         gfn_t base_gfn;
 340         unsigned long npages;
 341         gfn_t target_gfn;
 342 };
 343
 344 struct kvm_memory_slot {
 345         gfn_t base_gfn;
 346         unsigned long npages;
 347         unsigned long flags;
 348         struct page **phys_mem;
 349         unsigned long *dirty_bitmap;
 350 };
 351
 352 struct kvm {
 353         spinlock_t lock; /* protects everything except vcpus */
 354         int naliases;
 355         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 356         int nmemslots;
 357         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
 358         /*
 359          * Hash table of struct kvm_mmu_page.
 360          */
 361         struct list_head active_mmu_pages;
 362         int n_free_mmu_pages;
 363         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 364         struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
 365         int memory_config_version;
 366         int busy;
 367         unsigned long rmap_overflow;
 368         struct list_head vm_list;
 369         struct file *filp;
 370 };
 371
 372 struct descriptor_table {
 373         u16 limit;
 374         unsigned long base;
 375 } __attribute__((packed));
 376
 377 struct kvm_arch_ops {
 378         int (*cpu_has_kvm_support)(void);          /* __init */
 379         int (*disabled_by_bios)(void);             /* __init */
 380         void (*hardware_enable)(void *dummy);      /* __init */
 381         void (*hardware_disable)(void *dummy);
 382         int (*hardware_setup)(void);               /* __init */
 383         void (*hardware_unsetup)(void);            /* __exit */
 384
 385         int (*vcpu_create)(struct kvm_vcpu *vcpu);
 386         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 387
 388         void (*vcpu_load)(struct kvm_vcpu *vcpu);
 389         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 390         void (*vcpu_decache)(struct kvm_vcpu *vcpu);
 391
 392         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 393                                struct kvm_debug_guest *dbg);
 394         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 395         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 396         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 397         void (*get_segment)(struct kvm_vcpu *vcpu,
 398                             struct kvm_segment *var, int seg);
 399         void (*set_segment)(struct kvm_vcpu *vcpu,
 400                             struct kvm_segment *var, int seg);
 401         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 402         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 403         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 404         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 405         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 406         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 407         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 408         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 409         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 410         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 411         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 412         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 413                        int *exception);
 414         void (*cache_regs)(struct kvm_vcpu *vcpu);
 415         void (*decache_regs)(struct kvm_vcpu *vcpu);
 416         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 417         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 418
 419         void (*invlpg)(struct kvm_vcpu *vcpu, gva_t addr);
 420         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 421         void (*inject_page_fault)(struct kvm_vcpu *vcpu,
 422                                   unsigned long addr, u32 err_code);
 423
 424         void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);
 425
 426         int (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 427         int (*vcpu_setup)(struct kvm_vcpu *vcpu);
 428         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 429         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 430                                 unsigned char *hypercall_addr);
 431 };
 432
 433 extern struct kvm_arch_ops *kvm_arch_ops;
 434
 435 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 436 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 437
 438 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module);
 439 void kvm_exit_arch(void);
 440
 441 int kvm_mmu_module_init(void);
 442 void kvm_mmu_module_exit(void);
 443
 444 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 445 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 446 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 447
 448 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 449 void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot);
 450 void kvm_mmu_zap_all(struct kvm_vcpu *vcpu);
 451
 452 hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
 453 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 454 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 455 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 456 hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
 457 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
 458
 459 void kvm_emulator_want_group7_invlpg(void);
 460
 461 extern hpa_t bad_page_address;
 462
 463 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 464 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 465 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 466
 467 enum emulation_result {
 468         EMULATE_DONE,       /* no further processing */
 469         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 470         EMULATE_FAIL,         /* can't emulate this instruction */
 471 };
 472
 473 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 474                         unsigned long cr2, u16 error_code);
 475 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 476 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 477 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 478                    unsigned long *rflags);
 479
 480 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 481 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 482                      unsigned long *rflags);
 483
 484 struct x86_emulate_ctxt;
 485
 486 int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 487                   int size, unsigned long count, int string, int down,
 488                   gva_t address, int rep, unsigned port);
 489 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 490 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 491 int emulate_clts(struct kvm_vcpu *vcpu);
 492 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
 493                     unsigned long *dest);
 494 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 495                     unsigned long value);
 496
 497 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 498 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
 499 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
 500 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
 501 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 502
 503 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 504 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 505
 506 void fx_init(struct kvm_vcpu *vcpu);
 507
 508 void load_msrs(struct vmx_msr_entry *e, int n);
 509 void save_msrs(struct vmx_msr_entry *e, int n);
 510 void kvm_resched(struct kvm_vcpu *vcpu);
 511
 512 int kvm_read_guest(struct kvm_vcpu *vcpu,
 513                gva_t addr,
 514                unsigned long size,
 515                void *dest);
 516
 517 int kvm_write_guest(struct kvm_vcpu *vcpu,
 518                 gva_t addr,
 519                 unsigned long size,
 520                 void *data);
 521
 522 unsigned long segment_base(u16 selector);
 523
 524 void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
 525 void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
 526 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 527 void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 528
 529 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run);
 530
 531 static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
 532                                      u32 error_code)
 533 {
 534         if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
 535                 kvm_mmu_free_some_pages(vcpu);
 536         return vcpu->mmu.page_fault(vcpu, gva, error_code);
 537 }
 538
 539 static inline int is_long_mode(struct kvm_vcpu *vcpu)
 540 {
 541 #ifdef CONFIG_X86_64
 542         return vcpu->shadow_efer & EFER_LME;
 543 #else
 544         return 0;
 545 #endif
 546 }
 547
 548 static inline int is_pae(struct kvm_vcpu *vcpu)
 549 {
 550         return vcpu->cr4 & CR4_PAE_MASK;
 551 }
 552
 553 static inline int is_pse(struct kvm_vcpu *vcpu)
 554 {
 555         return vcpu->cr4 & CR4_PSE_MASK;
 556 }
 557
 558 static inline int is_paging(struct kvm_vcpu *vcpu)
 559 {
 560         return vcpu->cr0 & CR0_PG_MASK;
 561 }
 562
 563 static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
 564 {
 565         return slot - kvm->memslots;
 566 }
 567
 568 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 569 {
 570         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 571
 572         return (struct kvm_mmu_page *)page_private(page);
 573 }
 574
 575 static inline u16 read_fs(void)
 576 {
 577         u16 seg;
 578         asm ("mov %%fs, %0" : "=g"(seg));
 579         return seg;
 580 }
 581
 582 static inline u16 read_gs(void)
 583 {
 584         u16 seg;
 585         asm ("mov %%gs, %0" : "=g"(seg));
 586         return seg;
 587 }
 588
 589 static inline u16 read_ldt(void)
 590 {
 591         u16 ldt;
 592         asm ("sldt %0" : "=g"(ldt));
 593         return ldt;
 594 }
 595
 596 static inline void load_fs(u16 sel)
 597 {
 598         asm ("mov %0, %%fs" : : "rm"(sel));
 599 }
 600
 601 static inline void load_gs(u16 sel)
 602 {
 603         asm ("mov %0, %%gs" : : "rm"(sel));
 604 }
 605
 606 #ifndef load_ldt
 607 static inline void load_ldt(u16 sel)
 608 {
 609         asm ("lldt %0" : : "rm"(sel));
 610 }
 611 #endif
 612
 613 static inline void get_idt(struct descriptor_table *table)
 614 {
 615         asm ("sidt %0" : "=m"(*table));
 616 }
 617
 618 static inline void get_gdt(struct descriptor_table *table)
 619 {
 620         asm ("sgdt %0" : "=m"(*table));
 621 }
 622
 623 static inline unsigned long read_tr_base(void)
 624 {
 625         u16 tr;
 626         asm ("str %0" : "=g"(tr));
 627         return segment_base(tr);
 628 }
 629
 630 #ifdef CONFIG_X86_64
 631 static inline unsigned long read_msr(unsigned long msr)
 632 {
 633         u64 value;
 634
 635         rdmsrl(msr, value);
 636         return value;
 637 }
 638 #endif
 639
 640 static inline void fx_save(void *image)
 641 {
 642         asm ("fxsave (%0)":: "r" (image));
 643 }
 644
 645 static inline void fx_restore(void *image)
 646 {
 647         asm ("fxrstor (%0)":: "r" (image));
 648 }
 649
 650 static inline void fpu_init(void)
 651 {
 652         asm ("finit");
 653 }
 654
 655 static inline u32 get_rdx_init_val(void)
 656 {
 657         return 0x600; /* P6 family */
 658 }
 659
 660 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 661 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 662 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 663 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 664 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 665 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 666 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 667 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 668 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 669
 670 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 671
 672 #define TSS_IOPB_BASE_OFFSET 0x66
 673 #define TSS_BASE_SIZE 0x68
 674 #define TSS_IOPB_SIZE (65536 / 8)
 675 #define TSS_REDIRECTION_SIZE (256 / 8)
 676 #define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 677
 678 #endif