include/linux/kvm_host.h

   1 #ifndef __KVM_HOST_H
   2 #define __KVM_HOST_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/bug.h>
  17 #include <linux/mm.h>
  18 #include <linux/mmu_notifier.h>
  19 #include <linux/preempt.h>
  20 #include <linux/msi.h>
  21 #include <linux/slab.h>
  22 #include <linux/rcupdate.h>
  23 #include <linux/ratelimit.h>
  24 #include <linux/err.h>
  25 #include <asm/signal.h>
  26
  27 #include <linux/kvm.h>
  28 #include <linux/kvm_para.h>
  29
  30 #include <linux/kvm_types.h>
  31
  32 #include <asm/kvm_host.h>
  33
  34 #ifndef KVM_MMIO_SIZE
  35 #define KVM_MMIO_SIZE 8
  36 #endif
  37
  38 /*
  39  * The bit 16 ~ bit 31 of kvm_memory_region::flags are internally used
  40  * in kvm, other bits are visible for userspace which are defined in
  41  * include/linux/kvm_h.
  42  */
  43 #define KVM_MEMSLOT_INVALID     (1UL << 16)
  44
  45 /* Two fragments for cross MMIO pages. */
  46 #define KVM_MAX_MMIO_FRAGMENTS  2
  47
  48 /*
  49  * For the normal pfn, the highest 12 bits should be zero,
  50  * so we can mask bit 62 ~ bit 52  to indicate the error pfn,
  51  * mask bit 63 to indicate the noslot pfn.
  52  */
  53 #define KVM_PFN_ERR_MASK        (0x7ffULL << 52)
  54 #define KVM_PFN_ERR_NOSLOT_MASK (0xfffULL << 52)
  55 #define KVM_PFN_NOSLOT          (0x1ULL << 63)
  56
  57 #define KVM_PFN_ERR_FAULT       (KVM_PFN_ERR_MASK)
  58 #define KVM_PFN_ERR_HWPOISON    (KVM_PFN_ERR_MASK + 1)
  59 #define KVM_PFN_ERR_RO_FAULT    (KVM_PFN_ERR_MASK + 2)
  60
  61 /*
  62  * error pfns indicate that the gfn is in slot but faild to
  63  * translate it to pfn on host.
  64  */
  65 static inline bool is_error_pfn(pfn_t pfn)
  66 {
  67         return !!(pfn & KVM_PFN_ERR_MASK);
  68 }
  69
  70 /*
  71  * error_noslot pfns indicate that the gfn can not be
  72  * translated to pfn - it is not in slot or failed to
  73  * translate it to pfn.
  74  */
  75 static inline bool is_error_noslot_pfn(pfn_t pfn)
  76 {
  77         return !!(pfn & KVM_PFN_ERR_NOSLOT_MASK);
  78 }
  79
  80 /* noslot pfn indicates that the gfn is not in slot. */
  81 static inline bool is_noslot_pfn(pfn_t pfn)
  82 {
  83         return pfn == KVM_PFN_NOSLOT;
  84 }
  85
  86 #define KVM_HVA_ERR_BAD         (PAGE_OFFSET)
  87 #define KVM_HVA_ERR_RO_BAD      (PAGE_OFFSET + PAGE_SIZE)
  88
  89 static inline bool kvm_is_error_hva(unsigned long addr)
  90 {
  91         return addr >= PAGE_OFFSET;
  92 }
  93
  94 #define KVM_ERR_PTR_BAD_PAGE    (ERR_PTR(-ENOENT))
  95
  96 static inline bool is_error_page(struct page *page)
  97 {
  98         return IS_ERR(page);
  99 }
 100
 101 /*
 102  * vcpu->requests bit members
 103  */
 104 #define KVM_REQ_TLB_FLUSH          0
 105 #define KVM_REQ_MIGRATE_TIMER      1
 106 #define KVM_REQ_REPORT_TPR_ACCESS  2
 107 #define KVM_REQ_MMU_RELOAD         3
 108 #define KVM_REQ_TRIPLE_FAULT       4
 109 #define KVM_REQ_PENDING_TIMER      5
 110 #define KVM_REQ_UNHALT             6
 111 #define KVM_REQ_MMU_SYNC           7
 112 #define KVM_REQ_CLOCK_UPDATE       8
 113 #define KVM_REQ_KICK               9
 114 #define KVM_REQ_DEACTIVATE_FPU    10
 115 #define KVM_REQ_EVENT             11
 116 #define KVM_REQ_APF_HALT          12
 117 #define KVM_REQ_STEAL_UPDATE      13
 118 #define KVM_REQ_NMI               14
 119 #define KVM_REQ_IMMEDIATE_EXIT    15
 120 #define KVM_REQ_PMU               16
 121 #define KVM_REQ_PMI               17
 122 #define KVM_REQ_WATCHDOG          18
 123 #define KVM_REQ_MASTERCLOCK_UPDATE 19
 124 #define KVM_REQ_MCLOCK_INPROGRESS 20
 125
 126 #define KVM_USERSPACE_IRQ_SOURCE_ID             0
 127 #define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID        1
 128
 129 struct kvm;
 130 struct kvm_vcpu;
 131 extern struct kmem_cache *kvm_vcpu_cache;
 132
 133 struct kvm_io_range {
 134         gpa_t addr;
 135         int len;
 136         struct kvm_io_device *dev;
 137 };
 138
 139 #define NR_IOBUS_DEVS 1000
 140
 141 struct kvm_io_bus {
 142         int                   dev_count;
 143         struct kvm_io_range range[];
 144 };
 145
 146 enum kvm_bus {
 147         KVM_MMIO_BUS,
 148         KVM_PIO_BUS,
 149         KVM_NR_BUSES
 150 };
 151
 152 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
 153                      int len, const void *val);
 154 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len,
 155                     void *val);
 156 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
 157                             int len, struct kvm_io_device *dev);
 158 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
 159                               struct kvm_io_device *dev);
 160
 161 #ifdef CONFIG_KVM_ASYNC_PF
 162 struct kvm_async_pf {
 163         struct work_struct work;
 164         struct list_head link;
 165         struct list_head queue;
 166         struct kvm_vcpu *vcpu;
 167         struct mm_struct *mm;
 168         gva_t gva;
 169         unsigned long addr;
 170         struct kvm_arch_async_pf arch;
 171         struct page *page;
 172         bool done;
 173 };
 174
 175 void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);
 176 void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu);
 177 int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
 178                        struct kvm_arch_async_pf *arch);
 179 int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
 180 #endif
 181
 182 enum {
 183         OUTSIDE_GUEST_MODE,
 184         IN_GUEST_MODE,
 185         EXITING_GUEST_MODE,
 186         READING_SHADOW_PAGE_TABLES,
 187 };
 188
 189 /*
 190  * Sometimes a large or cross-page mmio needs to be broken up into separate
 191  * exits for userspace servicing.
 192  */
 193 struct kvm_mmio_fragment {
 194         gpa_t gpa;
 195         void *data;
 196         unsigned len;
 197 };
 198
 199 struct kvm_vcpu {
 200         struct kvm *kvm;
 201 #ifdef CONFIG_PREEMPT_NOTIFIERS
 202         struct preempt_notifier preempt_notifier;
 203 #endif
 204         int cpu;
 205         int vcpu_id;
 206         int srcu_idx;
 207         int mode;
 208         unsigned long requests;
 209         unsigned long guest_debug;
 210
 211         struct mutex mutex;
 212         struct kvm_run *run;
 213
 214         int fpu_active;
 215         int guest_fpu_loaded, guest_xcr0_loaded;
 216         wait_queue_head_t wq;
 217         struct pid *pid;
 218         int sigset_active;
 219         sigset_t sigset;
 220         struct kvm_vcpu_stat stat;
 221
 222 #ifdef CONFIG_HAS_IOMEM
 223         int mmio_needed;
 224         int mmio_read_completed;
 225         int mmio_is_write;
 226         int mmio_cur_fragment;
 227         int mmio_nr_fragments;
 228         struct kvm_mmio_fragment mmio_fragments[KVM_MAX_MMIO_FRAGMENTS];
 229 #endif
 230
 231 #ifdef CONFIG_KVM_ASYNC_PF
 232         struct {
 233                 u32 queued;
 234                 struct list_head queue;
 235                 struct list_head done;
 236                 spinlock_t lock;
 237         } async_pf;
 238 #endif
 239
 240 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
 241         /*
 242          * Cpu relax intercept or pause loop exit optimization
 243          * in_spin_loop: set when a vcpu does a pause loop exit
 244          *  or cpu relax intercepted.
 245          * dy_eligible: indicates whether vcpu is eligible for directed yield.
 246          */
 247         struct {
 248                 bool in_spin_loop;
 249                 bool dy_eligible;
 250         } spin_loop;
 251 #endif
 252         struct kvm_vcpu_arch arch;
 253 };
 254
 255 static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
 256 {
 257         return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
 258 }
 259
 260 /*
 261  * Some of the bitops functions do not support too long bitmaps.
 262  * This number must be determined not to exceed such limits.
 263  */
 264 #define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
 265
 266 struct kvm_memory_slot {
 267         gfn_t base_gfn;
 268         unsigned long npages;
 269         unsigned long flags;
 270         unsigned long *dirty_bitmap;
 271         struct kvm_arch_memory_slot arch;
 272         unsigned long userspace_addr;
 273         int user_alloc;
 274         int id;
 275 };
 276
 277 static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
 278 {
 279         return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 280 }
 281
 282 struct kvm_kernel_irq_routing_entry {
 283         u32 gsi;
 284         u32 type;
 285         int (*set)(struct kvm_kernel_irq_routing_entry *e,
 286                    struct kvm *kvm, int irq_source_id, int level);
 287         union {
 288                 struct {
 289                         unsigned irqchip;
 290                         unsigned pin;
 291                 } irqchip;
 292                 struct msi_msg msi;
 293         };
 294         struct hlist_node link;
 295 };
 296
 297 #ifdef __KVM_HAVE_IOAPIC
 298
 299 struct kvm_irq_routing_table {
 300         int chip[KVM_NR_IRQCHIPS][KVM_IOAPIC_NUM_PINS];
 301         struct kvm_kernel_irq_routing_entry *rt_entries;
 302         u32 nr_rt_entries;
 303         /*
 304          * Array indexed by gsi. Each entry contains list of irq chips
 305          * the gsi is connected to.
 306          */
 307         struct hlist_head map[0];
 308 };
 309
 310 #else
 311
 312 struct kvm_irq_routing_table {};
 313
 314 #endif
 315
 316 #ifndef KVM_MEM_SLOTS_NUM
 317 #define KVM_MEM_SLOTS_NUM (KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 318 #endif
 319
 320 /*
 321  * Note:
 322  * memslots are not sorted by id anymore, please use id_to_memslot()
 323  * to get the memslot by its id.
 324  */
 325 struct kvm_memslots {
 326         u64 generation;
 327         struct kvm_memory_slot memslots[KVM_MEM_SLOTS_NUM];
 328         /* The mapping table from slot id to the index in memslots[]. */
 329         int id_to_index[KVM_MEM_SLOTS_NUM];
 330 };
 331
 332 struct kvm {
 333         spinlock_t mmu_lock;
 334         struct mutex slots_lock;
 335         struct mm_struct *mm; /* userspace tied to this vm */
 336         struct kvm_memslots *memslots;
 337         struct srcu_struct srcu;
 338 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
 339         u32 bsp_vcpu_id;
 340 #endif
 341         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 342         atomic_t online_vcpus;
 343         int last_boosted_vcpu;
 344         struct list_head vm_list;
 345         struct mutex lock;
 346         struct kvm_io_bus *buses[KVM_NR_BUSES];
 347 #ifdef CONFIG_HAVE_KVM_EVENTFD
 348         struct {
 349                 spinlock_t        lock;
 350                 struct list_head  items;
 351                 struct list_head  resampler_list;
 352                 struct mutex      resampler_lock;
 353         } irqfds;
 354         struct list_head ioeventfds;
 355 #endif
 356         struct kvm_vm_stat stat;
 357         struct kvm_arch arch;
 358         atomic_t users_count;
 359 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 360         struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
 361         spinlock_t ring_lock;
 362         struct list_head coalesced_zones;
 363 #endif
 364
 365         struct mutex irq_lock;
 366 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 367         /*
 368          * Update side is protected by irq_lock and,
 369          * if configured, irqfds.lock.
 370          */
 371         struct kvm_irq_routing_table __rcu *irq_routing;
 372         struct hlist_head mask_notifier_list;
 373         struct hlist_head irq_ack_notifier_list;
 374 #endif
 375
 376 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 377         struct mmu_notifier mmu_notifier;
 378         unsigned long mmu_notifier_seq;
 379         long mmu_notifier_count;
 380 #endif
 381         long tlbs_dirty;
 382 };
 383
 384 #define kvm_err(fmt, ...) \
 385         pr_err("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
 386 #define kvm_info(fmt, ...) \
 387         pr_info("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
 388 #define kvm_debug(fmt, ...) \
 389         pr_debug("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
 390 #define kvm_pr_unimpl(fmt, ...) \
 391         pr_err_ratelimited("kvm [%i]: " fmt, \
 392                            task_tgid_nr(current), ## __VA_ARGS__)
 393
 394 /* The guest did something we don't support. */
 395 #define vcpu_unimpl(vcpu, fmt, ...)                                     \
 396         kvm_pr_unimpl("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
 397
 398 static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
 399 {
 400         smp_rmb();
 401         return kvm->vcpus[i];
 402 }
 403
 404 #define kvm_for_each_vcpu(idx, vcpup, kvm) \
 405         for (idx = 0; \
 406              idx < atomic_read(&kvm->online_vcpus) && \
 407              (vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
 408              idx++)
 409
 410 #define kvm_for_each_memslot(memslot, slots)    \
 411         for (memslot = &slots->memslots[0];     \
 412               memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\
 413                 memslot++)
 414
 415 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 416 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 417
 418 int __must_check vcpu_load(struct kvm_vcpu *vcpu);
 419 void vcpu_put(struct kvm_vcpu *vcpu);
 420
 421 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
 422                   struct module *module);
 423 void kvm_exit(void);
 424
 425 void kvm_get_kvm(struct kvm *kvm);
 426 void kvm_put_kvm(struct kvm *kvm);
 427 void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new);
 428
 429 static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
 430 {
 431         return rcu_dereference_check(kvm->memslots,
 432                         srcu_read_lock_held(&kvm->srcu)
 433                         || lockdep_is_held(&kvm->slots_lock));
 434 }
 435
 436 static inline struct kvm_memory_slot *
 437 id_to_memslot(struct kvm_memslots *slots, int id)
 438 {
 439         int index = slots->id_to_index[id];
 440         struct kvm_memory_slot *slot;
 441
 442         slot = &slots->memslots[index];
 443
 444         WARN_ON(slot->id != id);
 445         return slot;
 446 }
 447
 448 int kvm_set_memory_region(struct kvm *kvm,
 449                           struct kvm_userspace_memory_region *mem,
 450                           int user_alloc);
 451 int __kvm_set_memory_region(struct kvm *kvm,
 452                             struct kvm_userspace_memory_region *mem,
 453                             int user_alloc);
 454 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
 455                            struct kvm_memory_slot *dont);
 456 int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages);
 457 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 458                                 struct kvm_memory_slot *memslot,
 459                                 struct kvm_memory_slot old,
 460                                 struct kvm_userspace_memory_region *mem,
 461                                 int user_alloc);
 462 void kvm_arch_commit_memory_region(struct kvm *kvm,
 463                                 struct kvm_userspace_memory_region *mem,
 464                                 struct kvm_memory_slot old,
 465                                 int user_alloc);
 466 bool kvm_largepages_enabled(void);
 467 void kvm_disable_largepages(void);
 468 /* flush all memory translations */
 469 void kvm_arch_flush_shadow_all(struct kvm *kvm);
 470 /* flush memory translations pointing to 'slot' */
 471 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 472                                    struct kvm_memory_slot *slot);
 473
 474 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
 475                             int nr_pages);
 476
 477 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 478 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
 479 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
 480 void kvm_release_page_clean(struct page *page);
 481 void kvm_release_page_dirty(struct page *page);
 482 void kvm_set_page_dirty(struct page *page);
 483 void kvm_set_page_accessed(struct page *page);
 484
 485 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn);
 486 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
 487                        bool write_fault, bool *writable);
 488 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
 489 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
 490                       bool *writable);
 491 pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
 492 pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn);
 493
 494 void kvm_release_pfn_dirty(pfn_t pfn);
 495 void kvm_release_pfn_clean(pfn_t pfn);
 496 void kvm_set_pfn_dirty(pfn_t pfn);
 497 void kvm_set_pfn_accessed(pfn_t pfn);
 498 void kvm_get_pfn(pfn_t pfn);
 499
 500 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 501                         int len);
 502 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
 503                           unsigned long len);
 504 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
 505 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 506                            void *data, unsigned long len);
 507 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 508                          int offset, int len);
 509 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 510                     unsigned long len);
 511 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 512                            void *data, unsigned long len);
 513 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 514                               gpa_t gpa);
 515 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
 516 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
 517 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 518 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
 519 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
 520 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 521 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
 522                              gfn_t gfn);
 523
 524 void kvm_vcpu_block(struct kvm_vcpu *vcpu);
 525 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
 526 bool kvm_vcpu_yield_to(struct kvm_vcpu *target);
 527 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
 528 void kvm_resched(struct kvm_vcpu *vcpu);
 529 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 530 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 531
 532 void kvm_flush_remote_tlbs(struct kvm *kvm);
 533 void kvm_reload_remote_mmus(struct kvm *kvm);
 534 void kvm_make_mclock_inprogress_request(struct kvm *kvm);
 535
 536 long kvm_arch_dev_ioctl(struct file *filp,
 537                         unsigned int ioctl, unsigned long arg);
 538 long kvm_arch_vcpu_ioctl(struct file *filp,
 539                          unsigned int ioctl, unsigned long arg);
 540 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);
 541
 542 int kvm_dev_ioctl_check_extension(long ext);
 543
 544 int kvm_get_dirty_log(struct kvm *kvm,
 545                         struct kvm_dirty_log *log, int *is_dirty);
 546 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 547                                 struct kvm_dirty_log *log);
 548
 549 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 550                                    struct
 551                                    kvm_userspace_memory_region *mem,
 552                                    int user_alloc);
 553 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level);
 554 long kvm_arch_vm_ioctl(struct file *filp,
 555                        unsigned int ioctl, unsigned long arg);
 556
 557 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 558 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 559
 560 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 561                                     struct kvm_translation *tr);
 562
 563 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 564 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 565 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 566                                   struct kvm_sregs *sregs);
 567 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 568                                   struct kvm_sregs *sregs);
 569 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 570                                     struct kvm_mp_state *mp_state);
 571 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 572                                     struct kvm_mp_state *mp_state);
 573 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 574                                         struct kvm_guest_debug *dbg);
 575 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
 576
 577 int kvm_arch_init(void *opaque);
 578 void kvm_arch_exit(void);
 579
 580 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
 581 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
 582
 583 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
 584 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 585 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 586 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
 587 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
 588 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);
 589 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
 590
 591 int kvm_arch_hardware_enable(void *garbage);
 592 void kvm_arch_hardware_disable(void *garbage);
 593 int kvm_arch_hardware_setup(void);
 594 void kvm_arch_hardware_unsetup(void);
 595 void kvm_arch_check_processor_compat(void *rtn);
 596 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
 597 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
 598
 599 void kvm_free_physmem(struct kvm *kvm);
 600
 601 void *kvm_kvzalloc(unsigned long size);
 602 void kvm_kvfree(const void *addr);
 603
 604 #ifndef __KVM_HAVE_ARCH_VM_ALLOC
 605 static inline struct kvm *kvm_arch_alloc_vm(void)
 606 {
 607         return kzalloc(sizeof(struct kvm), GFP_KERNEL);
 608 }
 609
 610 static inline void kvm_arch_free_vm(struct kvm *kvm)
 611 {
 612         kfree(kvm);
 613 }
 614 #endif
 615
 616 static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
 617 {
 618 #ifdef __KVM_HAVE_ARCH_WQP
 619         return vcpu->arch.wqp;
 620 #else
 621         return &vcpu->wq;
 622 #endif
 623 }
 624
 625 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
 626 void kvm_arch_destroy_vm(struct kvm *kvm);
 627 void kvm_free_all_assigned_devices(struct kvm *kvm);
 628 void kvm_arch_sync_events(struct kvm *kvm);
 629
 630 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
 631 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
 632
 633 bool kvm_is_mmio_pfn(pfn_t pfn);
 634
 635 struct kvm_irq_ack_notifier {
 636         struct hlist_node link;
 637         unsigned gsi;
 638         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
 639 };
 640
 641 struct kvm_assigned_dev_kernel {
 642         struct kvm_irq_ack_notifier ack_notifier;
 643         struct list_head list;
 644         int assigned_dev_id;
 645         int host_segnr;
 646         int host_busnr;
 647         int host_devfn;
 648         unsigned int entries_nr;
 649         int host_irq;
 650         bool host_irq_disabled;
 651         bool pci_2_3;
 652         struct msix_entry *host_msix_entries;
 653         int guest_irq;
 654         struct msix_entry *guest_msix_entries;
 655         unsigned long irq_requested_type;
 656         int irq_source_id;
 657         int flags;
 658         struct pci_dev *dev;
 659         struct kvm *kvm;
 660         spinlock_t intx_lock;
 661         spinlock_t intx_mask_lock;
 662         char irq_name[32];
 663         struct pci_saved_state *pci_saved_state;
 664 };
 665
 666 struct kvm_irq_mask_notifier {
 667         void (*func)(struct kvm_irq_mask_notifier *kimn, bool masked);
 668         int irq;
 669         struct hlist_node link;
 670 };
 671
 672 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
 673                                     struct kvm_irq_mask_notifier *kimn);
 674 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 675                                       struct kvm_irq_mask_notifier *kimn);
 676 void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
 677                              bool mask);
 678
 679 #ifdef __KVM_HAVE_IOAPIC
 680 void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
 681                                    union kvm_ioapic_redirect_entry *entry,
 682                                    unsigned long *deliver_bitmask);
 683 #endif
 684 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level);
 685 int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level);
 686 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
 687                 int irq_source_id, int level);
 688 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
 689 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 690                                    struct kvm_irq_ack_notifier *kian);
 691 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
 692                                    struct kvm_irq_ack_notifier *kian);
 693 int kvm_request_irq_source_id(struct kvm *kvm);
 694 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
 695
 696 /* For vcpu->arch.iommu_flags */
 697 #define KVM_IOMMU_CACHE_COHERENCY       0x1
 698
 699 #ifdef CONFIG_IOMMU_API
 700 int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
 701 void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
 702 int kvm_iommu_map_guest(struct kvm *kvm);
 703 int kvm_iommu_unmap_guest(struct kvm *kvm);
 704 int kvm_assign_device(struct kvm *kvm,
 705                       struct kvm_assigned_dev_kernel *assigned_dev);
 706 int kvm_deassign_device(struct kvm *kvm,
 707                         struct kvm_assigned_dev_kernel *assigned_dev);
 708 #else /* CONFIG_IOMMU_API */
 709 static inline int kvm_iommu_map_pages(struct kvm *kvm,
 710                                       struct kvm_memory_slot *slot)
 711 {
 712         return 0;
 713 }
 714
 715 static inline void kvm_iommu_unmap_pages(struct kvm *kvm,
 716                                          struct kvm_memory_slot *slot)
 717 {
 718 }
 719
 720 static inline int kvm_iommu_map_guest(struct kvm *kvm)
 721 {
 722         return -ENODEV;
 723 }
 724
 725 static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
 726 {
 727         return 0;
 728 }
 729
 730 static inline int kvm_assign_device(struct kvm *kvm,
 731                 struct kvm_assigned_dev_kernel *assigned_dev)
 732 {
 733         return 0;
 734 }
 735
 736 static inline int kvm_deassign_device(struct kvm *kvm,
 737                 struct kvm_assigned_dev_kernel *assigned_dev)
 738 {
 739         return 0;
 740 }
 741 #endif /* CONFIG_IOMMU_API */
 742
 743 static inline void kvm_guest_enter(void)
 744 {
 745         BUG_ON(preemptible());
 746         /*
 747          * This is running in ioctl context so we can avoid
 748          * the call to vtime_account() with its unnecessary idle check.
 749          */
 750         vtime_account_system_irqsafe(current);
 751         current->flags |= PF_VCPU;
 752         /* KVM does not hold any references to rcu protected data when it
 753          * switches CPU into a guest mode. In fact switching to a guest mode
 754          * is very similar to exiting to userspase from rcu point of view. In
 755          * addition CPU may stay in a guest mode for quite a long time (up to
 756          * one time slice). Lets treat guest mode as quiescent state, just like
 757          * we do with user-mode execution.
 758          */
 759         rcu_virt_note_context_switch(smp_processor_id());
 760 }
 761
 762 static inline void kvm_guest_exit(void)
 763 {
 764         /*
 765          * This is running in ioctl context so we can avoid
 766          * the call to vtime_account() with its unnecessary idle check.
 767          */
 768         vtime_account_system_irqsafe(current);
 769         current->flags &= ~PF_VCPU;
 770 }
 771
 772 /*
 773  * search_memslots() and __gfn_to_memslot() are here because they are
 774  * used in non-modular code in arch/powerpc/kvm/book3s_hv_rm_mmu.c.
 775  * gfn_to_memslot() itself isn't here as an inline because that would
 776  * bloat other code too much.
 777  */
 778 static inline struct kvm_memory_slot *
 779 search_memslots(struct kvm_memslots *slots, gfn_t gfn)
 780 {
 781         struct kvm_memory_slot *memslot;
 782
 783         kvm_for_each_memslot(memslot, slots)
 784                 if (gfn >= memslot->base_gfn &&
 785                       gfn < memslot->base_gfn + memslot->npages)
 786                         return memslot;
 787
 788         return NULL;
 789 }
 790
 791 static inline struct kvm_memory_slot *
 792 __gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
 793 {
 794         return search_memslots(slots, gfn);
 795 }
 796
 797 static inline unsigned long
 798 __gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
 799 {
 800         return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
 801 }
 802
 803 static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
 804 {
 805         return gfn_to_memslot(kvm, gfn)->id;
 806 }
 807
 808 static inline gfn_t gfn_to_index(gfn_t gfn, gfn_t base_gfn, int level)
 809 {
 810         /* KVM_HPAGE_GFN_SHIFT(PT_PAGE_TABLE_LEVEL) must be 0. */
 811         return (gfn >> KVM_HPAGE_GFN_SHIFT(level)) -
 812                 (base_gfn >> KVM_HPAGE_GFN_SHIFT(level));
 813 }
 814
 815 static inline gfn_t
 816 hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot)
 817 {
 818         gfn_t gfn_offset = (hva - slot->userspace_addr) >> PAGE_SHIFT;
 819
 820         return slot->base_gfn + gfn_offset;
 821 }
 822
 823 static inline gpa_t gfn_to_gpa(gfn_t gfn)
 824 {
 825         return (gpa_t)gfn << PAGE_SHIFT;
 826 }
 827
 828 static inline gfn_t gpa_to_gfn(gpa_t gpa)
 829 {
 830         return (gfn_t)(gpa >> PAGE_SHIFT);
 831 }
 832
 833 static inline hpa_t pfn_to_hpa(pfn_t pfn)
 834 {
 835         return (hpa_t)pfn << PAGE_SHIFT;
 836 }
 837
 838 static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
 839 {
 840         set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
 841 }
 842
 843 enum kvm_stat_kind {
 844         KVM_STAT_VM,
 845         KVM_STAT_VCPU,
 846 };
 847
 848 struct kvm_stats_debugfs_item {
 849         const char *name;
 850         int offset;
 851         enum kvm_stat_kind kind;
 852         struct dentry *dentry;
 853 };
 854 extern struct kvm_stats_debugfs_item debugfs_entries[];
 855 extern struct dentry *kvm_debugfs_dir;
 856
 857 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 858 static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
 859 {
 860         if (unlikely(kvm->mmu_notifier_count))
 861                 return 1;
 862         /*
 863          * Ensure the read of mmu_notifier_count happens before the read
 864          * of mmu_notifier_seq.  This interacts with the smp_wmb() in
 865          * mmu_notifier_invalidate_range_end to make sure that the caller
 866          * either sees the old (non-zero) value of mmu_notifier_count or
 867          * the new (incremented) value of mmu_notifier_seq.
 868          * PowerPC Book3s HV KVM calls this under a per-page lock
 869          * rather than under kvm->mmu_lock, for scalability, so
 870          * can't rely on kvm->mmu_lock to keep things ordered.
 871          */
 872         smp_rmb();
 873         if (kvm->mmu_notifier_seq != mmu_seq)
 874                 return 1;
 875         return 0;
 876 }
 877 #endif
 878
 879 #ifdef KVM_CAP_IRQ_ROUTING
 880
 881 #define KVM_MAX_IRQ_ROUTES 1024
 882
 883 int kvm_setup_default_irq_routing(struct kvm *kvm);
 884 int kvm_set_irq_routing(struct kvm *kvm,
 885                         const struct kvm_irq_routing_entry *entries,
 886                         unsigned nr,
 887                         unsigned flags);
 888 void kvm_free_irq_routing(struct kvm *kvm);
 889
 890 int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
 891
 892 #else
 893
 894 static inline void kvm_free_irq_routing(struct kvm *kvm) {}
 895
 896 #endif
 897
 898 #ifdef CONFIG_HAVE_KVM_EVENTFD
 899
 900 void kvm_eventfd_init(struct kvm *kvm);
 901 int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
 902
 903 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 904 int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args);
 905 void kvm_irqfd_release(struct kvm *kvm);
 906 void kvm_irq_routing_update(struct kvm *, struct kvm_irq_routing_table *);
 907 #else
 908 static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
 909 {
 910         return -EINVAL;
 911 }
 912
 913 static inline void kvm_irqfd_release(struct kvm *kvm) {}
 914 #endif
 915
 916 #else
 917
 918 static inline void kvm_eventfd_init(struct kvm *kvm) {}
 919
 920 static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
 921 {
 922         return -EINVAL;
 923 }
 924
 925 static inline void kvm_irqfd_release(struct kvm *kvm) {}
 926
 927 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 928 static inline void kvm_irq_routing_update(struct kvm *kvm,
 929                                           struct kvm_irq_routing_table *irq_rt)
 930 {
 931         rcu_assign_pointer(kvm->irq_routing, irq_rt);
 932 }
 933 #endif
 934
 935 static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
 936 {
 937         return -ENOSYS;
 938 }
 939
 940 #endif /* CONFIG_HAVE_KVM_EVENTFD */
 941
 942 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
 943 static inline bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
 944 {
 945         return vcpu->kvm->bsp_vcpu_id == vcpu->vcpu_id;
 946 }
 947
 948 bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu);
 949
 950 #else
 951
 952 static inline bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) { return true; }
 953
 954 #endif
 955
 956 #ifdef __KVM_HAVE_DEVICE_ASSIGNMENT
 957
 958 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 959                                   unsigned long arg);
 960
 961 #else
 962
 963 static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 964                                                 unsigned long arg)
 965 {
 966         return -ENOTTY;
 967 }
 968
 969 #endif
 970
 971 static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
 972 {
 973         set_bit(req, &vcpu->requests);
 974 }
 975
 976 static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
 977 {
 978         if (test_bit(req, &vcpu->requests)) {
 979                 clear_bit(req, &vcpu->requests);
 980                 return true;
 981         } else {
 982                 return false;
 983         }
 984 }
 985
 986 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
 987
 988 static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
 989 {
 990         vcpu->spin_loop.in_spin_loop = val;
 991 }
 992 static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
 993 {
 994         vcpu->spin_loop.dy_eligible = val;
 995 }
 996
 997 #else /* !CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
 998
 999 static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
1000 {
1001 }
1002
1003 static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
1004 {
1005 }
1006
1007 static inline bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
1008 {
1009         return true;
1010 }
1011
1012 #endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
1013 #endif
1014