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         int guest_fpu_loaded;
 308
 309         int mmio_needed;
 310         int mmio_read_completed;
 311         int mmio_is_write;
 312         int mmio_size;
 313         unsigned char mmio_data[8];
 314         gpa_t mmio_phys_addr;
 315         gva_t mmio_fault_cr2;
 316         struct kvm_pio_request pio;
 317         void *pio_data;
 318
 319         int sigset_active;
 320         sigset_t sigset;
 321
 322         struct kvm_stat stat;
 323
 324         struct {
 325                 int active;
 326                 u8 save_iopl;
 327                 struct kvm_save_segment {
 328                         u16 selector;
 329                         unsigned long base;
 330                         u32 limit;
 331                         u32 ar;
 332                 } tr, es, ds, fs, gs;
 333         } rmode;
 334
 335         int cpuid_nent;
 336         struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 337 };
 338
 339 struct kvm_mem_alias {
 340         gfn_t base_gfn;
 341         unsigned long npages;
 342         gfn_t target_gfn;
 343 };
 344
 345 struct kvm_memory_slot {
 346         gfn_t base_gfn;
 347         unsigned long npages;
 348         unsigned long flags;
 349         struct page **phys_mem;
 350         unsigned long *dirty_bitmap;
 351 };
 352
 353 struct kvm {
 354         spinlock_t lock; /* protects everything except vcpus */
 355         int naliases;
 356         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 357         int nmemslots;
 358         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
 359         /*
 360          * Hash table of struct kvm_mmu_page.
 361          */
 362         struct list_head active_mmu_pages;
 363         int n_free_mmu_pages;
 364         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 365         struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
 366         int memory_config_version;
 367         int busy;
 368         unsigned long rmap_overflow;
 369         struct list_head vm_list;
 370         struct file *filp;
 371 };
 372
 373 struct descriptor_table {
 374         u16 limit;
 375         unsigned long base;
 376 } __attribute__((packed));
 377
 378 struct kvm_arch_ops {
 379         int (*cpu_has_kvm_support)(void);          /* __init */
 380         int (*disabled_by_bios)(void);             /* __init */
 381         void (*hardware_enable)(void *dummy);      /* __init */
 382         void (*hardware_disable)(void *dummy);
 383         int (*hardware_setup)(void);               /* __init */
 384         void (*hardware_unsetup)(void);            /* __exit */
 385
 386         int (*vcpu_create)(struct kvm_vcpu *vcpu);
 387         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 388
 389         void (*vcpu_load)(struct kvm_vcpu *vcpu);
 390         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 391         void (*vcpu_decache)(struct kvm_vcpu *vcpu);
 392
 393         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 394                                struct kvm_debug_guest *dbg);
 395         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 396         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 397         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 398         void (*get_segment)(struct kvm_vcpu *vcpu,
 399                             struct kvm_segment *var, int seg);
 400         void (*set_segment)(struct kvm_vcpu *vcpu,
 401                             struct kvm_segment *var, int seg);
 402         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 403         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 404         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 405         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 406         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 407         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 408         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 409         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 410         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 411         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 412         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 413         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 414                        int *exception);
 415         void (*cache_regs)(struct kvm_vcpu *vcpu);
 416         void (*decache_regs)(struct kvm_vcpu *vcpu);
 417         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 418         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 419
 420         void (*invlpg)(struct kvm_vcpu *vcpu, gva_t addr);
 421         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 422         void (*inject_page_fault)(struct kvm_vcpu *vcpu,
 423                                   unsigned long addr, u32 err_code);
 424
 425         void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);
 426
 427         int (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 428         int (*vcpu_setup)(struct kvm_vcpu *vcpu);
 429         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 430         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 431                                 unsigned char *hypercall_addr);
 432 };
 433
 434 extern struct kvm_arch_ops *kvm_arch_ops;
 435
 436 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 437 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 438
 439 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module);
 440 void kvm_exit_arch(void);
 441
 442 int kvm_mmu_module_init(void);
 443 void kvm_mmu_module_exit(void);
 444
 445 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 446 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 447 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 448
 449 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 450 void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot);
 451 void kvm_mmu_zap_all(struct kvm_vcpu *vcpu);
 452
 453 hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
 454 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 455 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 456 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 457 hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
 458 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
 459
 460 void kvm_emulator_want_group7_invlpg(void);
 461
 462 extern hpa_t bad_page_address;
 463
 464 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 465 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 466 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 467
 468 enum emulation_result {
 469         EMULATE_DONE,       /* no further processing */
 470         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 471         EMULATE_FAIL,         /* can't emulate this instruction */
 472 };
 473
 474 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 475                         unsigned long cr2, u16 error_code);
 476 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 477 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 478 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 479                    unsigned long *rflags);
 480
 481 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 482 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 483                      unsigned long *rflags);
 484
 485 struct x86_emulate_ctxt;
 486
 487 int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 488                   int size, unsigned long count, int string, int down,
 489                   gva_t address, int rep, unsigned port);
 490 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 491 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 492 int emulate_clts(struct kvm_vcpu *vcpu);
 493 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
 494                     unsigned long *dest);
 495 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 496                     unsigned long value);
 497
 498 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 499 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
 500 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
 501 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
 502 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 503
 504 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 505 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 506
 507 void fx_init(struct kvm_vcpu *vcpu);
 508
 509 void load_msrs(struct vmx_msr_entry *e, int n);
 510 void save_msrs(struct vmx_msr_entry *e, int n);
 511 void kvm_resched(struct kvm_vcpu *vcpu);
 512 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 513 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 514
 515 int kvm_read_guest(struct kvm_vcpu *vcpu,
 516                gva_t addr,
 517                unsigned long size,
 518                void *dest);
 519
 520 int kvm_write_guest(struct kvm_vcpu *vcpu,
 521                 gva_t addr,
 522                 unsigned long size,
 523                 void *data);
 524
 525 unsigned long segment_base(u16 selector);
 526
 527 void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
 528 void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
 529 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 530 void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 531
 532 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run);
 533
 534 static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
 535                                      u32 error_code)
 536 {
 537         if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
 538                 kvm_mmu_free_some_pages(vcpu);
 539         return vcpu->mmu.page_fault(vcpu, gva, error_code);
 540 }
 541
 542 static inline int is_long_mode(struct kvm_vcpu *vcpu)
 543 {
 544 #ifdef CONFIG_X86_64
 545         return vcpu->shadow_efer & EFER_LME;
 546 #else
 547         return 0;
 548 #endif
 549 }
 550
 551 static inline int is_pae(struct kvm_vcpu *vcpu)
 552 {
 553         return vcpu->cr4 & CR4_PAE_MASK;
 554 }
 555
 556 static inline int is_pse(struct kvm_vcpu *vcpu)
 557 {
 558         return vcpu->cr4 & CR4_PSE_MASK;
 559 }
 560
 561 static inline int is_paging(struct kvm_vcpu *vcpu)
 562 {
 563         return vcpu->cr0 & CR0_PG_MASK;
 564 }
 565
 566 static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
 567 {
 568         return slot - kvm->memslots;
 569 }
 570
 571 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 572 {
 573         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 574
 575         return (struct kvm_mmu_page *)page_private(page);
 576 }
 577
 578 static inline u16 read_fs(void)
 579 {
 580         u16 seg;
 581         asm ("mov %%fs, %0" : "=g"(seg));
 582         return seg;
 583 }
 584
 585 static inline u16 read_gs(void)
 586 {
 587         u16 seg;
 588         asm ("mov %%gs, %0" : "=g"(seg));
 589         return seg;
 590 }
 591
 592 static inline u16 read_ldt(void)
 593 {
 594         u16 ldt;
 595         asm ("sldt %0" : "=g"(ldt));
 596         return ldt;
 597 }
 598
 599 static inline void load_fs(u16 sel)
 600 {
 601         asm ("mov %0, %%fs" : : "rm"(sel));
 602 }
 603
 604 static inline void load_gs(u16 sel)
 605 {
 606         asm ("mov %0, %%gs" : : "rm"(sel));
 607 }
 608
 609 #ifndef load_ldt
 610 static inline void load_ldt(u16 sel)
 611 {
 612         asm ("lldt %0" : : "rm"(sel));
 613 }
 614 #endif
 615
 616 static inline void get_idt(struct descriptor_table *table)
 617 {
 618         asm ("sidt %0" : "=m"(*table));
 619 }
 620
 621 static inline void get_gdt(struct descriptor_table *table)
 622 {
 623         asm ("sgdt %0" : "=m"(*table));
 624 }
 625
 626 static inline unsigned long read_tr_base(void)
 627 {
 628         u16 tr;
 629         asm ("str %0" : "=g"(tr));
 630         return segment_base(tr);
 631 }
 632
 633 #ifdef CONFIG_X86_64
 634 static inline unsigned long read_msr(unsigned long msr)
 635 {
 636         u64 value;
 637
 638         rdmsrl(msr, value);
 639         return value;
 640 }
 641 #endif
 642
 643 static inline void fx_save(void *image)
 644 {
 645         asm ("fxsave (%0)":: "r" (image));
 646 }
 647
 648 static inline void fx_restore(void *image)
 649 {
 650         asm ("fxrstor (%0)":: "r" (image));
 651 }
 652
 653 static inline void fpu_init(void)
 654 {
 655         asm ("finit");
 656 }
 657
 658 static inline u32 get_rdx_init_val(void)
 659 {
 660         return 0x600; /* P6 family */
 661 }
 662
 663 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 664 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 665 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 666 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 667 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 668 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 669 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 670 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 671 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 672
 673 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 674
 675 #define TSS_IOPB_BASE_OFFSET 0x66
 676 #define TSS_BASE_SIZE 0x68
 677 #define TSS_IOPB_SIZE (65536 / 8)
 678 #define TSS_REDIRECTION_SIZE (256 / 8)
 679 #define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 680
 681 #endif