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 1024
  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         u32 light_exits;
 256 };
 257
 258 struct kvm_vcpu {
 259         struct kvm *kvm;
 260         union {
 261                 struct vmcs *vmcs;
 262                 struct vcpu_svm *svm;
 263         };
 264         struct mutex mutex;
 265         int   cpu;
 266         int   launched;
 267         u64 host_tsc;
 268         struct kvm_run *run;
 269         int interrupt_window_open;
 270         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 271 #define NR_IRQ_WORDS KVM_IRQ_BITMAP_SIZE(unsigned long)
 272         unsigned long irq_pending[NR_IRQ_WORDS];
 273         unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
 274         unsigned long rip;      /* needs vcpu_load_rsp_rip() */
 275
 276         unsigned long cr0;
 277         unsigned long cr2;
 278         unsigned long cr3;
 279         gpa_t para_state_gpa;
 280         struct page *para_state_page;
 281         gpa_t hypercall_gpa;
 282         unsigned long cr4;
 283         unsigned long cr8;
 284         u64 pdptrs[4]; /* pae */
 285         u64 shadow_efer;
 286         u64 apic_base;
 287         u64 ia32_misc_enable_msr;
 288         int nmsrs;
 289         struct vmx_msr_entry *guest_msrs;
 290         struct vmx_msr_entry *host_msrs;
 291
 292         struct list_head free_pages;
 293         struct kvm_mmu_page page_header_buf[KVM_NUM_MMU_PAGES];
 294         struct kvm_mmu mmu;
 295
 296         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 297         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 298
 299         gfn_t last_pt_write_gfn;
 300         int   last_pt_write_count;
 301
 302         struct kvm_guest_debug guest_debug;
 303
 304         char fx_buf[FX_BUF_SIZE];
 305         char *host_fx_image;
 306         char *guest_fx_image;
 307         int fpu_active;
 308         int guest_fpu_loaded;
 309         struct vmx_host_state {
 310                 int loaded;
 311                 u16 fs_sel, gs_sel, ldt_sel;
 312                 int fs_gs_ldt_reload_needed;
 313         } vmx_host_state;
 314
 315         int mmio_needed;
 316         int mmio_read_completed;
 317         int mmio_is_write;
 318         int mmio_size;
 319         unsigned char mmio_data[8];
 320         gpa_t mmio_phys_addr;
 321         gva_t mmio_fault_cr2;
 322         struct kvm_pio_request pio;
 323         void *pio_data;
 324
 325         int sigset_active;
 326         sigset_t sigset;
 327
 328         struct kvm_stat stat;
 329
 330         struct {
 331                 int active;
 332                 u8 save_iopl;
 333                 struct kvm_save_segment {
 334                         u16 selector;
 335                         unsigned long base;
 336                         u32 limit;
 337                         u32 ar;
 338                 } tr, es, ds, fs, gs;
 339         } rmode;
 340
 341         int cpuid_nent;
 342         struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 343 };
 344
 345 struct kvm_mem_alias {
 346         gfn_t base_gfn;
 347         unsigned long npages;
 348         gfn_t target_gfn;
 349 };
 350
 351 struct kvm_memory_slot {
 352         gfn_t base_gfn;
 353         unsigned long npages;
 354         unsigned long flags;
 355         struct page **phys_mem;
 356         unsigned long *dirty_bitmap;
 357 };
 358
 359 struct kvm {
 360         spinlock_t lock; /* protects everything except vcpus */
 361         int naliases;
 362         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 363         int nmemslots;
 364         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
 365         /*
 366          * Hash table of struct kvm_mmu_page.
 367          */
 368         struct list_head active_mmu_pages;
 369         int n_free_mmu_pages;
 370         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 371         struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
 372         int memory_config_version;
 373         int busy;
 374         unsigned long rmap_overflow;
 375         struct list_head vm_list;
 376         struct file *filp;
 377 };
 378
 379 struct descriptor_table {
 380         u16 limit;
 381         unsigned long base;
 382 } __attribute__((packed));
 383
 384 struct kvm_arch_ops {
 385         int (*cpu_has_kvm_support)(void);          /* __init */
 386         int (*disabled_by_bios)(void);             /* __init */
 387         void (*hardware_enable)(void *dummy);      /* __init */
 388         void (*hardware_disable)(void *dummy);
 389         int (*hardware_setup)(void);               /* __init */
 390         void (*hardware_unsetup)(void);            /* __exit */
 391
 392         int (*vcpu_create)(struct kvm_vcpu *vcpu);
 393         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 394
 395         void (*vcpu_load)(struct kvm_vcpu *vcpu);
 396         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 397         void (*vcpu_decache)(struct kvm_vcpu *vcpu);
 398
 399         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 400                                struct kvm_debug_guest *dbg);
 401         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 402         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 403         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 404         void (*get_segment)(struct kvm_vcpu *vcpu,
 405                             struct kvm_segment *var, int seg);
 406         void (*set_segment)(struct kvm_vcpu *vcpu,
 407                             struct kvm_segment *var, int seg);
 408         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 409         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 410         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 411         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 412         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 413         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 414         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 415         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 416         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 417         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 418         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 419         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 420                        int *exception);
 421         void (*cache_regs)(struct kvm_vcpu *vcpu);
 422         void (*decache_regs)(struct kvm_vcpu *vcpu);
 423         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 424         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 425
 426         void (*invlpg)(struct kvm_vcpu *vcpu, gva_t addr);
 427         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 428         void (*inject_page_fault)(struct kvm_vcpu *vcpu,
 429                                   unsigned long addr, u32 err_code);
 430
 431         void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);
 432
 433         int (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 434         int (*vcpu_setup)(struct kvm_vcpu *vcpu);
 435         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 436         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 437                                 unsigned char *hypercall_addr);
 438 };
 439
 440 extern struct kvm_arch_ops *kvm_arch_ops;
 441
 442 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 443 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 444
 445 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module);
 446 void kvm_exit_arch(void);
 447
 448 int kvm_mmu_module_init(void);
 449 void kvm_mmu_module_exit(void);
 450
 451 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 452 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 453 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 454
 455 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 456 void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot);
 457 void kvm_mmu_zap_all(struct kvm_vcpu *vcpu);
 458
 459 hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
 460 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 461 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 462 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 463 hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
 464 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
 465
 466 void kvm_emulator_want_group7_invlpg(void);
 467
 468 extern hpa_t bad_page_address;
 469
 470 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 471 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 472 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 473
 474 enum emulation_result {
 475         EMULATE_DONE,       /* no further processing */
 476         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 477         EMULATE_FAIL,         /* can't emulate this instruction */
 478 };
 479
 480 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 481                         unsigned long cr2, u16 error_code);
 482 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 483 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 484 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 485                    unsigned long *rflags);
 486
 487 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 488 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 489                      unsigned long *rflags);
 490
 491 struct x86_emulate_ctxt;
 492
 493 int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 494                   int size, unsigned long count, int string, int down,
 495                   gva_t address, int rep, unsigned port);
 496 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 497 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 498 int emulate_clts(struct kvm_vcpu *vcpu);
 499 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
 500                     unsigned long *dest);
 501 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 502                     unsigned long value);
 503
 504 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 505 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
 506 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
 507 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
 508 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 509
 510 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 511 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 512
 513 void fx_init(struct kvm_vcpu *vcpu);
 514
 515 void load_msrs(struct vmx_msr_entry *e, int n);
 516 void save_msrs(struct vmx_msr_entry *e, int n);
 517 void kvm_resched(struct kvm_vcpu *vcpu);
 518 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 519 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 520
 521 int kvm_read_guest(struct kvm_vcpu *vcpu,
 522                gva_t addr,
 523                unsigned long size,
 524                void *dest);
 525
 526 int kvm_write_guest(struct kvm_vcpu *vcpu,
 527                 gva_t addr,
 528                 unsigned long size,
 529                 void *data);
 530
 531 unsigned long segment_base(u16 selector);
 532
 533 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 534                        const u8 *old, const u8 *new, int bytes);
 535 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 536 void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 537
 538 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run);
 539
 540 static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
 541                                      u32 error_code)
 542 {
 543         if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
 544                 kvm_mmu_free_some_pages(vcpu);
 545         return vcpu->mmu.page_fault(vcpu, gva, error_code);
 546 }
 547
 548 static inline int is_long_mode(struct kvm_vcpu *vcpu)
 549 {
 550 #ifdef CONFIG_X86_64
 551         return vcpu->shadow_efer & EFER_LME;
 552 #else
 553         return 0;
 554 #endif
 555 }
 556
 557 static inline int is_pae(struct kvm_vcpu *vcpu)
 558 {
 559         return vcpu->cr4 & CR4_PAE_MASK;
 560 }
 561
 562 static inline int is_pse(struct kvm_vcpu *vcpu)
 563 {
 564         return vcpu->cr4 & CR4_PSE_MASK;
 565 }
 566
 567 static inline int is_paging(struct kvm_vcpu *vcpu)
 568 {
 569         return vcpu->cr0 & CR0_PG_MASK;
 570 }
 571
 572 static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
 573 {
 574         return slot - kvm->memslots;
 575 }
 576
 577 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 578 {
 579         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 580
 581         return (struct kvm_mmu_page *)page_private(page);
 582 }
 583
 584 static inline u16 read_fs(void)
 585 {
 586         u16 seg;
 587         asm ("mov %%fs, %0" : "=g"(seg));
 588         return seg;
 589 }
 590
 591 static inline u16 read_gs(void)
 592 {
 593         u16 seg;
 594         asm ("mov %%gs, %0" : "=g"(seg));
 595         return seg;
 596 }
 597
 598 static inline u16 read_ldt(void)
 599 {
 600         u16 ldt;
 601         asm ("sldt %0" : "=g"(ldt));
 602         return ldt;
 603 }
 604
 605 static inline void load_fs(u16 sel)
 606 {
 607         asm ("mov %0, %%fs" : : "rm"(sel));
 608 }
 609
 610 static inline void load_gs(u16 sel)
 611 {
 612         asm ("mov %0, %%gs" : : "rm"(sel));
 613 }
 614
 615 #ifndef load_ldt
 616 static inline void load_ldt(u16 sel)
 617 {
 618         asm ("lldt %0" : : "rm"(sel));
 619 }
 620 #endif
 621
 622 static inline void get_idt(struct descriptor_table *table)
 623 {
 624         asm ("sidt %0" : "=m"(*table));
 625 }
 626
 627 static inline void get_gdt(struct descriptor_table *table)
 628 {
 629         asm ("sgdt %0" : "=m"(*table));
 630 }
 631
 632 static inline unsigned long read_tr_base(void)
 633 {
 634         u16 tr;
 635         asm ("str %0" : "=g"(tr));
 636         return segment_base(tr);
 637 }
 638
 639 #ifdef CONFIG_X86_64
 640 static inline unsigned long read_msr(unsigned long msr)
 641 {
 642         u64 value;
 643
 644         rdmsrl(msr, value);
 645         return value;
 646 }
 647 #endif
 648
 649 static inline void fx_save(void *image)
 650 {
 651         asm ("fxsave (%0)":: "r" (image));
 652 }
 653
 654 static inline void fx_restore(void *image)
 655 {
 656         asm ("fxrstor (%0)":: "r" (image));
 657 }
 658
 659 static inline void fpu_init(void)
 660 {
 661         asm ("finit");
 662 }
 663
 664 static inline u32 get_rdx_init_val(void)
 665 {
 666         return 0x600; /* P6 family */
 667 }
 668
 669 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 670 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 671 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 672 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 673 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 674 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 675 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 676 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 677 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 678
 679 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 680
 681 #define TSS_IOPB_BASE_OFFSET 0x66
 682 #define TSS_BASE_SIZE 0x68
 683 #define TSS_IOPB_SIZE (65536 / 8)
 684 #define TSS_REDIRECTION_SIZE (256 / 8)
 685 #define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 686
 687 #endif