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/hardirq.h>
  11 #include <linux/list.h>
  12 #include <linux/mutex.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/signal.h>
  15 #include <linux/sched.h>
  16 #include <linux/mm.h>
  17 #include <linux/preempt.h>
  18 #include <asm/signal.h>
  19
  20 #include <linux/kvm.h>
  21 #include <linux/kvm_para.h>
  22
  23 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
  24 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
  25 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS|0xFFFFFF0000000000ULL)
  26
  27 #define KVM_GUEST_CR0_MASK \
  28         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE \
  29          | X86_CR0_NW | X86_CR0_CD)
  30 #define KVM_VM_CR0_ALWAYS_ON \
  31         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE | X86_CR0_TS \
  32          | X86_CR0_MP)
  33 #define KVM_GUEST_CR4_MASK \
  34         (X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)
  35 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
  36 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
  37
  38 #define INVALID_PAGE (~(hpa_t)0)
  39 #define UNMAPPED_GVA (~(gpa_t)0)
  40
  41 #define KVM_MAX_VCPUS 4
  42 #define KVM_ALIAS_SLOTS 4
  43 #define KVM_MEMORY_SLOTS 8
  44 /* memory slots that does not exposed to userspace */
  45 #define KVM_PRIVATE_MEM_SLOTS 4
  46 #define KVM_PERMILLE_MMU_PAGES 20
  47 #define KVM_MIN_ALLOC_MMU_PAGES 64
  48 #define KVM_NUM_MMU_PAGES 1024
  49 #define KVM_MIN_FREE_MMU_PAGES 5
  50 #define KVM_REFILL_PAGES 25
  51 #define KVM_MAX_CPUID_ENTRIES 40
  52
  53 #define DE_VECTOR 0
  54 #define UD_VECTOR 6
  55 #define NM_VECTOR 7
  56 #define DF_VECTOR 8
  57 #define TS_VECTOR 10
  58 #define NP_VECTOR 11
  59 #define SS_VECTOR 12
  60 #define GP_VECTOR 13
  61 #define PF_VECTOR 14
  62
  63 #define SELECTOR_TI_MASK (1 << 2)
  64 #define SELECTOR_RPL_MASK 0x03
  65
  66 #define IOPL_SHIFT 12
  67
  68 #define KVM_PIO_PAGE_OFFSET 1
  69
  70 /*
  71  * vcpu->requests bit members
  72  */
  73 #define KVM_REQ_TLB_FLUSH          0
  74
  75 /*
  76  * Address types:
  77  *
  78  *  gva - guest virtual address
  79  *  gpa - guest physical address
  80  *  gfn - guest frame number
  81  *  hva - host virtual address
  82  *  hpa - host physical address
  83  *  hfn - host frame number
  84  */
  85
  86 typedef unsigned long  gva_t;
  87 typedef u64            gpa_t;
  88 typedef unsigned long  gfn_t;
  89
  90 typedef unsigned long  hva_t;
  91 typedef u64            hpa_t;
  92 typedef unsigned long  hfn_t;
  93
  94 #define NR_PTE_CHAIN_ENTRIES 5
  95
  96 struct kvm_pte_chain {
  97         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
  98         struct hlist_node link;
  99 };
 100
 101 /*
 102  * kvm_mmu_page_role, below, is defined as:
 103  *
 104  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 105  *   bits 4:7 - page table level for this shadow (1-4)
 106  *   bits 8:9 - page table quadrant for 2-level guests
 107  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 108  *   bits 17:19 - "access" - the user, writable, and nx bits of a huge page pde
 109  */
 110 union kvm_mmu_page_role {
 111         unsigned word;
 112         struct {
 113                 unsigned glevels : 4;
 114                 unsigned level : 4;
 115                 unsigned quadrant : 2;
 116                 unsigned pad_for_nice_hex_output : 6;
 117                 unsigned metaphysical : 1;
 118                 unsigned hugepage_access : 3;
 119         };
 120 };
 121
 122 struct kvm_mmu_page {
 123         struct list_head link;
 124         struct hlist_node hash_link;
 125
 126         /*
 127          * The following two entries are used to key the shadow page in the
 128          * hash table.
 129          */
 130         gfn_t gfn;
 131         union kvm_mmu_page_role role;
 132
 133         u64 *spt;
 134         /* hold the gfn of each spte inside spt */
 135         gfn_t *gfns;
 136         unsigned long slot_bitmap; /* One bit set per slot which has memory
 137                                     * in this shadow page.
 138                                     */
 139         int multimapped;         /* More than one parent_pte? */
 140         int root_count;          /* Currently serving as active root */
 141         union {
 142                 u64 *parent_pte;               /* !multimapped */
 143                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 144         };
 145 };
 146
 147 struct kvm_vcpu;
 148 extern struct kmem_cache *kvm_vcpu_cache;
 149
 150 /*
 151  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 152  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 153  * mode.
 154  */
 155 struct kvm_mmu {
 156         void (*new_cr3)(struct kvm_vcpu *vcpu);
 157         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 158         void (*free)(struct kvm_vcpu *vcpu);
 159         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 160         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 161                               struct kvm_mmu_page *page);
 162         hpa_t root_hpa;
 163         int root_level;
 164         int shadow_root_level;
 165
 166         u64 *pae_root;
 167 };
 168
 169 #define KVM_NR_MEM_OBJS 40
 170
 171 struct kvm_mmu_memory_cache {
 172         int nobjs;
 173         void *objects[KVM_NR_MEM_OBJS];
 174 };
 175
 176 /*
 177  * We don't want allocation failures within the mmu code, so we preallocate
 178  * enough memory for a single page fault in a cache.
 179  */
 180 struct kvm_guest_debug {
 181         int enabled;
 182         unsigned long bp[4];
 183         int singlestep;
 184 };
 185
 186 enum {
 187         VCPU_REGS_RAX = 0,
 188         VCPU_REGS_RCX = 1,
 189         VCPU_REGS_RDX = 2,
 190         VCPU_REGS_RBX = 3,
 191         VCPU_REGS_RSP = 4,
 192         VCPU_REGS_RBP = 5,
 193         VCPU_REGS_RSI = 6,
 194         VCPU_REGS_RDI = 7,
 195 #ifdef CONFIG_X86_64
 196         VCPU_REGS_R8 = 8,
 197         VCPU_REGS_R9 = 9,
 198         VCPU_REGS_R10 = 10,
 199         VCPU_REGS_R11 = 11,
 200         VCPU_REGS_R12 = 12,
 201         VCPU_REGS_R13 = 13,
 202         VCPU_REGS_R14 = 14,
 203         VCPU_REGS_R15 = 15,
 204 #endif
 205         NR_VCPU_REGS
 206 };
 207
 208 enum {
 209         VCPU_SREG_CS,
 210         VCPU_SREG_DS,
 211         VCPU_SREG_ES,
 212         VCPU_SREG_FS,
 213         VCPU_SREG_GS,
 214         VCPU_SREG_SS,
 215         VCPU_SREG_TR,
 216         VCPU_SREG_LDTR,
 217 };
 218
 219 #include "x86_emulate.h"
 220
 221 struct kvm_pio_request {
 222         unsigned long count;
 223         int cur_count;
 224         struct page *guest_pages[2];
 225         unsigned guest_page_offset;
 226         int in;
 227         int port;
 228         int size;
 229         int string;
 230         int down;
 231         int rep;
 232 };
 233
 234 struct kvm_stat {
 235         u32 pf_fixed;
 236         u32 pf_guest;
 237         u32 tlb_flush;
 238         u32 invlpg;
 239
 240         u32 exits;
 241         u32 io_exits;
 242         u32 mmio_exits;
 243         u32 signal_exits;
 244         u32 irq_window_exits;
 245         u32 halt_exits;
 246         u32 halt_wakeup;
 247         u32 request_irq_exits;
 248         u32 irq_exits;
 249         u32 light_exits;
 250         u32 efer_reload;
 251 };
 252
 253 struct kvm_io_device {
 254         void (*read)(struct kvm_io_device *this,
 255                      gpa_t addr,
 256                      int len,
 257                      void *val);
 258         void (*write)(struct kvm_io_device *this,
 259                       gpa_t addr,
 260                       int len,
 261                       const void *val);
 262         int (*in_range)(struct kvm_io_device *this, gpa_t addr);
 263         void (*destructor)(struct kvm_io_device *this);
 264
 265         void             *private;
 266 };
 267
 268 static inline void kvm_iodevice_read(struct kvm_io_device *dev,
 269                                      gpa_t addr,
 270                                      int len,
 271                                      void *val)
 272 {
 273         dev->read(dev, addr, len, val);
 274 }
 275
 276 static inline void kvm_iodevice_write(struct kvm_io_device *dev,
 277                                       gpa_t addr,
 278                                       int len,
 279                                       const void *val)
 280 {
 281         dev->write(dev, addr, len, val);
 282 }
 283
 284 static inline int kvm_iodevice_inrange(struct kvm_io_device *dev, gpa_t addr)
 285 {
 286         return dev->in_range(dev, addr);
 287 }
 288
 289 static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
 290 {
 291         if (dev->destructor)
 292                 dev->destructor(dev);
 293 }
 294
 295 /*
 296  * It would be nice to use something smarter than a linear search, TBD...
 297  * Thankfully we dont expect many devices to register (famous last words :),
 298  * so until then it will suffice.  At least its abstracted so we can change
 299  * in one place.
 300  */
 301 struct kvm_io_bus {
 302         int                   dev_count;
 303 #define NR_IOBUS_DEVS 6
 304         struct kvm_io_device *devs[NR_IOBUS_DEVS];
 305 };
 306
 307 void kvm_io_bus_init(struct kvm_io_bus *bus);
 308 void kvm_io_bus_destroy(struct kvm_io_bus *bus);
 309 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr);
 310 void kvm_io_bus_register_dev(struct kvm_io_bus *bus,
 311                              struct kvm_io_device *dev);
 312
 313 #ifdef CONFIG_HAS_IOMEM
 314 #define KVM_VCPU_MMIO                   \
 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
 322 #else
 323 #define KVM_VCPU_MMIO
 324
 325 #endif
 326
 327 #define KVM_VCPU_COMM                                   \
 328         struct kvm *kvm;                                \
 329         struct preempt_notifier preempt_notifier;       \
 330         int vcpu_id;                                    \
 331         struct mutex mutex;                             \
 332         int   cpu;                                      \
 333         struct kvm_run *run;                            \
 334         int guest_mode;                                 \
 335         unsigned long requests;                         \
 336         struct kvm_guest_debug guest_debug;             \
 337         int fpu_active;                                 \
 338         int guest_fpu_loaded;                           \
 339         wait_queue_head_t wq;                           \
 340         int sigset_active;                              \
 341         sigset_t sigset;                                \
 342         struct kvm_stat stat;                           \
 343         KVM_VCPU_MMIO
 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         unsigned long *rmap;
 356         unsigned long *dirty_bitmap;
 357         unsigned long userspace_addr;
 358         int user_alloc;
 359 };
 360
 361 struct kvm {
 362         struct mutex lock; /* protects everything except vcpus */
 363         int naliases;
 364         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 365         int nmemslots;
 366         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
 367                                         KVM_PRIVATE_MEM_SLOTS];
 368         /*
 369          * Hash table of struct kvm_mmu_page.
 370          */
 371         struct list_head active_mmu_pages;
 372         unsigned int n_free_mmu_pages;
 373         unsigned int n_requested_mmu_pages;
 374         unsigned int n_alloc_mmu_pages;
 375         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 376         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 377         unsigned long rmap_overflow;
 378         struct list_head vm_list;
 379         struct file *filp;
 380         struct kvm_io_bus mmio_bus;
 381         struct kvm_io_bus pio_bus;
 382         struct kvm_pic *vpic;
 383         struct kvm_ioapic *vioapic;
 384         int round_robin_prev_vcpu;
 385 };
 386
 387 static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
 388 {
 389         return kvm->vpic;
 390 }
 391
 392 static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
 393 {
 394         return kvm->vioapic;
 395 }
 396
 397 static inline int irqchip_in_kernel(struct kvm *kvm)
 398 {
 399         return pic_irqchip(kvm) != 0;
 400 }
 401
 402 struct descriptor_table {
 403         u16 limit;
 404         unsigned long base;
 405 } __attribute__((packed));
 406
 407 struct kvm_x86_ops {
 408         int (*cpu_has_kvm_support)(void);          /* __init */
 409         int (*disabled_by_bios)(void);             /* __init */
 410         void (*hardware_enable)(void *dummy);      /* __init */
 411         void (*hardware_disable)(void *dummy);
 412         void (*check_processor_compatibility)(void *rtn);
 413         int (*hardware_setup)(void);               /* __init */
 414         void (*hardware_unsetup)(void);            /* __exit */
 415
 416         /* Create, but do not attach this VCPU */
 417         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 418         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 419         int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 420
 421         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 422         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 423         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 424         void (*vcpu_decache)(struct kvm_vcpu *vcpu);
 425
 426         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 427                                struct kvm_debug_guest *dbg);
 428         void (*guest_debug_pre)(struct kvm_vcpu *vcpu);
 429         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 430         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 431         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 432         void (*get_segment)(struct kvm_vcpu *vcpu,
 433                             struct kvm_segment *var, int seg);
 434         void (*set_segment)(struct kvm_vcpu *vcpu,
 435                             struct kvm_segment *var, int seg);
 436         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 437         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 438         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 439         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 440         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 441         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 442         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 443         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 444         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 445         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 446         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 447         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 448                        int *exception);
 449         void (*cache_regs)(struct kvm_vcpu *vcpu);
 450         void (*decache_regs)(struct kvm_vcpu *vcpu);
 451         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 452         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 453
 454         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 455         void (*inject_page_fault)(struct kvm_vcpu *vcpu,
 456                                   unsigned long addr, u32 err_code);
 457
 458         void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);
 459
 460         void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 461         int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 462         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 463         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 464                                 unsigned char *hypercall_addr);
 465         int (*get_irq)(struct kvm_vcpu *vcpu);
 466         void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
 467         void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
 468         void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
 469                                        struct kvm_run *run);
 470 };
 471
 472 extern struct kvm_x86_ops *kvm_x86_ops;
 473
 474 /* The guest did something we don't support. */
 475 #define pr_unimpl(vcpu, fmt, ...)                                       \
 476  do {                                                                   \
 477         if (printk_ratelimit())                                         \
 478                 printk(KERN_ERR "kvm: %i: cpu%i " fmt,                  \
 479                        current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
 480  } while (0)
 481
 482 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 483 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 484
 485 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 486 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 487
 488 void vcpu_load(struct kvm_vcpu *vcpu);
 489 void vcpu_put(struct kvm_vcpu *vcpu);
 490
 491
 492 int kvm_init_x86(struct kvm_x86_ops *ops, unsigned int vcpu_size,
 493                   struct module *module);
 494 void kvm_exit_x86(void);
 495
 496 int kvm_mmu_module_init(void);
 497 void kvm_mmu_module_exit(void);
 498
 499 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 500 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 501 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 502 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 503
 504 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 505 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 506 void kvm_mmu_zap_all(struct kvm *kvm);
 507 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 508
 509 hpa_t gpa_to_hpa(struct kvm *kvm, gpa_t gpa);
 510 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 511 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 512 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 513 hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
 514 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
 515
 516 extern struct page *bad_page;
 517
 518 int is_error_page(struct page *page);
 519 int kvm_set_memory_region(struct kvm *kvm,
 520                           struct kvm_userspace_memory_region *mem,
 521                           int user_alloc);
 522 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn);
 523 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 524 void kvm_release_page(struct page *page);
 525 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 526                         int len);
 527 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
 528 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 529                          int offset, int len);
 530 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 531                     unsigned long len);
 532 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
 533 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
 534 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 535 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
 536 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 537
 538 enum emulation_result {
 539         EMULATE_DONE,       /* no further processing */
 540         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 541         EMULATE_FAIL,         /* can't emulate this instruction */
 542 };
 543
 544 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 545                         unsigned long cr2, u16 error_code, int no_decode);
 546 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 547 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 548 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 549 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 550                    unsigned long *rflags);
 551
 552 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 553 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 554                      unsigned long *rflags);
 555 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 556 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 557
 558 struct x86_emulate_ctxt;
 559
 560 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 561                      int size, unsigned port);
 562 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 563                            int size, unsigned long count, int down,
 564                             gva_t address, int rep, unsigned port);
 565 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 566 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 567 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 568 int emulate_clts(struct kvm_vcpu *vcpu);
 569 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 570                     unsigned long *dest);
 571 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 572                     unsigned long value);
 573
 574 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 575 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
 576 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
 577 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
 578 unsigned long get_cr8(struct kvm_vcpu *vcpu);
 579 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 580 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 581
 582 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 583 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 584
 585 void fx_init(struct kvm_vcpu *vcpu);
 586
 587 void kvm_resched(struct kvm_vcpu *vcpu);
 588 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 589 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 590 void kvm_flush_remote_tlbs(struct kvm *kvm);
 591
 592 int emulator_read_std(unsigned long addr,
 593                       void *val,
 594                       unsigned int bytes,
 595                       struct kvm_vcpu *vcpu);
 596 int emulator_write_emulated(unsigned long addr,
 597                             const void *val,
 598                             unsigned int bytes,
 599                             struct kvm_vcpu *vcpu);
 600
 601 unsigned long segment_base(u16 selector);
 602
 603 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 604                        const u8 *new, int bytes);
 605 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 606 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 607 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 608 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 609
 610 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 611
 612 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 613
 614 long kvm_arch_dev_ioctl(struct file *filp,
 615                         unsigned int ioctl, unsigned long arg);
 616 long kvm_arch_vcpu_ioctl(struct file *filp,
 617                          unsigned int ioctl, unsigned long arg);
 618 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 619 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 620
 621 __init void kvm_arch_init(void);
 622
 623 static inline void kvm_guest_enter(void)
 624 {
 625         account_system_vtime(current);
 626         current->flags |= PF_VCPU;
 627 }
 628
 629 static inline void kvm_guest_exit(void)
 630 {
 631         account_system_vtime(current);
 632         current->flags &= ~PF_VCPU;
 633 }
 634
 635 static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
 636 {
 637         return slot - kvm->memslots;
 638 }
 639
 640 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 641 {
 642         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 643
 644         return (struct kvm_mmu_page *)page_private(page);
 645 }
 646
 647 static inline u16 read_fs(void)
 648 {
 649         u16 seg;
 650         asm("mov %%fs, %0" : "=g"(seg));
 651         return seg;
 652 }
 653
 654 static inline u16 read_gs(void)
 655 {
 656         u16 seg;
 657         asm("mov %%gs, %0" : "=g"(seg));
 658         return seg;
 659 }
 660
 661 static inline u16 read_ldt(void)
 662 {
 663         u16 ldt;
 664         asm("sldt %0" : "=g"(ldt));
 665         return ldt;
 666 }
 667
 668 static inline void load_fs(u16 sel)
 669 {
 670         asm("mov %0, %%fs" : : "rm"(sel));
 671 }
 672
 673 static inline void load_gs(u16 sel)
 674 {
 675         asm("mov %0, %%gs" : : "rm"(sel));
 676 }
 677
 678 #ifndef load_ldt
 679 static inline void load_ldt(u16 sel)
 680 {
 681         asm("lldt %0" : : "rm"(sel));
 682 }
 683 #endif
 684
 685 static inline void get_idt(struct descriptor_table *table)
 686 {
 687         asm("sidt %0" : "=m"(*table));
 688 }
 689
 690 static inline void get_gdt(struct descriptor_table *table)
 691 {
 692         asm("sgdt %0" : "=m"(*table));
 693 }
 694
 695 static inline unsigned long read_tr_base(void)
 696 {
 697         u16 tr;
 698         asm("str %0" : "=g"(tr));
 699         return segment_base(tr);
 700 }
 701
 702 #ifdef CONFIG_X86_64
 703 static inline unsigned long read_msr(unsigned long msr)
 704 {
 705         u64 value;
 706
 707         rdmsrl(msr, value);
 708         return value;
 709 }
 710 #endif
 711
 712 static inline void fx_save(struct i387_fxsave_struct *image)
 713 {
 714         asm("fxsave (%0)":: "r" (image));
 715 }
 716
 717 static inline void fx_restore(struct i387_fxsave_struct *image)
 718 {
 719         asm("fxrstor (%0)":: "r" (image));
 720 }
 721
 722 static inline void fpu_init(void)
 723 {
 724         asm("finit");
 725 }
 726
 727 static inline u32 get_rdx_init_val(void)
 728 {
 729         return 0x600; /* P6 family */
 730 }
 731
 732 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 733 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 734 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 735 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 736 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 737 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 738 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 739 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 740 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 741
 742 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 743
 744 #define TSS_IOPB_BASE_OFFSET 0x66
 745 #define TSS_BASE_SIZE 0x68
 746 #define TSS_IOPB_SIZE (65536 / 8)
 747 #define TSS_REDIRECTION_SIZE (256 / 8)
 748 #define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 749
 750 #endif