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/mm.h>
  17 #include <linux/preempt.h>
  18 #include <linux/msi.h>
  19 #include <asm/signal.h>
  20
  21 #include <linux/kvm.h>
  22 #include <linux/kvm_para.h>
  23
  24 #include <linux/kvm_types.h>
  25
  26 #include <asm/kvm_host.h>
  27
  28 /*
  29  * vcpu->requests bit members
  30  */
  31 #define KVM_REQ_TLB_FLUSH          0
  32 #define KVM_REQ_MIGRATE_TIMER      1
  33 #define KVM_REQ_REPORT_TPR_ACCESS  2
  34 #define KVM_REQ_MMU_RELOAD         3
  35 #define KVM_REQ_TRIPLE_FAULT       4
  36 #define KVM_REQ_PENDING_TIMER      5
  37 #define KVM_REQ_UNHALT             6
  38 #define KVM_REQ_MMU_SYNC           7
  39 #define KVM_REQ_KVMCLOCK_UPDATE    8
  40 #define KVM_REQ_KICK               9
  41 #define KVM_REQ_DEACTIVATE_FPU    10
  42
  43 #define KVM_USERSPACE_IRQ_SOURCE_ID     0
  44
  45 struct kvm;
  46 struct kvm_vcpu;
  47 extern struct kmem_cache *kvm_vcpu_cache;
  48
  49 /*
  50  * It would be nice to use something smarter than a linear search, TBD...
  51  * Thankfully we dont expect many devices to register (famous last words :),
  52  * so until then it will suffice.  At least its abstracted so we can change
  53  * in one place.
  54  */
  55 struct kvm_io_bus {
  56         int                   dev_count;
  57 #define NR_IOBUS_DEVS 200
  58         struct kvm_io_device *devs[NR_IOBUS_DEVS];
  59 };
  60
  61 enum kvm_bus {
  62         KVM_MMIO_BUS,
  63         KVM_PIO_BUS,
  64         KVM_NR_BUSES
  65 };
  66
  67 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
  68                      int len, const void *val);
  69 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len,
  70                     void *val);
  71 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
  72                             struct kvm_io_device *dev);
  73 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
  74                               struct kvm_io_device *dev);
  75
  76 struct kvm_vcpu {
  77         struct kvm *kvm;
  78 #ifdef CONFIG_PREEMPT_NOTIFIERS
  79         struct preempt_notifier preempt_notifier;
  80 #endif
  81         int vcpu_id;
  82         struct mutex mutex;
  83         int   cpu;
  84         struct kvm_run *run;
  85         unsigned long requests;
  86         unsigned long guest_debug;
  87         int srcu_idx;
  88
  89         int fpu_active;
  90         int guest_fpu_loaded;
  91         wait_queue_head_t wq;
  92         int sigset_active;
  93         sigset_t sigset;
  94         struct kvm_vcpu_stat stat;
  95
  96 #ifdef CONFIG_HAS_IOMEM
  97         int mmio_needed;
  98         int mmio_read_completed;
  99         int mmio_is_write;
 100         int mmio_size;
 101         unsigned char mmio_data[8];
 102         gpa_t mmio_phys_addr;
 103 #endif
 104
 105         struct kvm_vcpu_arch arch;
 106 };
 107
 108 struct kvm_memory_slot {
 109         gfn_t base_gfn;
 110         unsigned long npages;
 111         unsigned long flags;
 112         unsigned long *rmap;
 113         unsigned long *dirty_bitmap;
 114         struct {
 115                 unsigned long rmap_pde;
 116                 int write_count;
 117         } *lpage_info[KVM_NR_PAGE_SIZES - 1];
 118         unsigned long userspace_addr;
 119         int user_alloc;
 120 };
 121
 122 static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
 123 {
 124         return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 125 }
 126
 127 struct kvm_kernel_irq_routing_entry {
 128         u32 gsi;
 129         u32 type;
 130         int (*set)(struct kvm_kernel_irq_routing_entry *e,
 131                    struct kvm *kvm, int irq_source_id, int level);
 132         union {
 133                 struct {
 134                         unsigned irqchip;
 135                         unsigned pin;
 136                 } irqchip;
 137                 struct msi_msg msi;
 138         };
 139         struct hlist_node link;
 140 };
 141
 142 #ifdef __KVM_HAVE_IOAPIC
 143
 144 struct kvm_irq_routing_table {
 145         int chip[KVM_NR_IRQCHIPS][KVM_IOAPIC_NUM_PINS];
 146         struct kvm_kernel_irq_routing_entry *rt_entries;
 147         u32 nr_rt_entries;
 148         /*
 149          * Array indexed by gsi. Each entry contains list of irq chips
 150          * the gsi is connected to.
 151          */
 152         struct hlist_head map[0];
 153 };
 154
 155 #else
 156
 157 struct kvm_irq_routing_table {};
 158
 159 #endif
 160
 161 struct kvm_memslots {
 162         int nmemslots;
 163         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
 164                                         KVM_PRIVATE_MEM_SLOTS];
 165 };
 166
 167 struct kvm {
 168         spinlock_t mmu_lock;
 169         raw_spinlock_t requests_lock;
 170         struct mutex slots_lock;
 171         struct mm_struct *mm; /* userspace tied to this vm */
 172         struct kvm_memslots *memslots;
 173         struct srcu_struct srcu;
 174 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
 175         u32 bsp_vcpu_id;
 176         struct kvm_vcpu *bsp_vcpu;
 177 #endif
 178         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 179         atomic_t online_vcpus;
 180         struct list_head vm_list;
 181         struct mutex lock;
 182         struct kvm_io_bus *buses[KVM_NR_BUSES];
 183 #ifdef CONFIG_HAVE_KVM_EVENTFD
 184         struct {
 185                 spinlock_t        lock;
 186                 struct list_head  items;
 187         } irqfds;
 188         struct list_head ioeventfds;
 189 #endif
 190         struct kvm_vm_stat stat;
 191         struct kvm_arch arch;
 192         atomic_t users_count;
 193 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 194         struct kvm_coalesced_mmio_dev *coalesced_mmio_dev;
 195         struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
 196 #endif
 197
 198         struct mutex irq_lock;
 199 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 200         struct kvm_irq_routing_table *irq_routing;
 201         struct hlist_head mask_notifier_list;
 202         struct hlist_head irq_ack_notifier_list;
 203 #endif
 204
 205 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 206         struct mmu_notifier mmu_notifier;
 207         unsigned long mmu_notifier_seq;
 208         long mmu_notifier_count;
 209 #endif
 210 };
 211
 212 /* The guest did something we don't support. */
 213 #define pr_unimpl(vcpu, fmt, ...)                                       \
 214  do {                                                                   \
 215         if (printk_ratelimit())                                         \
 216                 printk(KERN_ERR "kvm: %i: cpu%i " fmt,                  \
 217                        current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
 218  } while (0)
 219
 220 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 221 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 222
 223 static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
 224 {
 225         smp_rmb();
 226         return kvm->vcpus[i];
 227 }
 228
 229 #define kvm_for_each_vcpu(idx, vcpup, kvm) \
 230         for (idx = 0, vcpup = kvm_get_vcpu(kvm, idx); \
 231              idx < atomic_read(&kvm->online_vcpus) && vcpup; \
 232              vcpup = kvm_get_vcpu(kvm, ++idx))
 233
 234 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 235 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 236
 237 void vcpu_load(struct kvm_vcpu *vcpu);
 238 void vcpu_put(struct kvm_vcpu *vcpu);
 239
 240 int kvm_init(void *opaque, unsigned int vcpu_size,
 241                   struct module *module);
 242 void kvm_exit(void);
 243
 244 void kvm_get_kvm(struct kvm *kvm);
 245 void kvm_put_kvm(struct kvm *kvm);
 246
 247 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 248 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 249 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 250 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
 251
 252 extern struct page *bad_page;
 253 extern pfn_t bad_pfn;
 254
 255 int is_error_page(struct page *page);
 256 int is_error_pfn(pfn_t pfn);
 257 int kvm_is_error_hva(unsigned long addr);
 258 int kvm_set_memory_region(struct kvm *kvm,
 259                           struct kvm_userspace_memory_region *mem,
 260                           int user_alloc);
 261 int __kvm_set_memory_region(struct kvm *kvm,
 262                             struct kvm_userspace_memory_region *mem,
 263                             int user_alloc);
 264 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 265                                 struct kvm_memory_slot *memslot,
 266                                 struct kvm_memory_slot old,
 267                                 struct kvm_userspace_memory_region *mem,
 268                                 int user_alloc);
 269 void kvm_arch_commit_memory_region(struct kvm *kvm,
 270                                 struct kvm_userspace_memory_region *mem,
 271                                 struct kvm_memory_slot old,
 272                                 int user_alloc);
 273 void kvm_disable_largepages(void);
 274 void kvm_arch_flush_shadow(struct kvm *kvm);
 275 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn);
 276 gfn_t unalias_gfn_instantiation(struct kvm *kvm, gfn_t gfn);
 277
 278 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 279 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
 280 void kvm_release_page_clean(struct page *page);
 281 void kvm_release_page_dirty(struct page *page);
 282 void kvm_set_page_dirty(struct page *page);
 283 void kvm_set_page_accessed(struct page *page);
 284
 285 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
 286 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
 287                          struct kvm_memory_slot *slot, gfn_t gfn);
 288 int memslot_id(struct kvm *kvm, gfn_t gfn);
 289 void kvm_release_pfn_dirty(pfn_t);
 290 void kvm_release_pfn_clean(pfn_t pfn);
 291 void kvm_set_pfn_dirty(pfn_t pfn);
 292 void kvm_set_pfn_accessed(pfn_t pfn);
 293 void kvm_get_pfn(pfn_t pfn);
 294
 295 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 296                         int len);
 297 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
 298                           unsigned long len);
 299 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
 300 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 301                          int offset, int len);
 302 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 303                     unsigned long len);
 304 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
 305 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
 306 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 307 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
 308 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
 309 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 310
 311 void kvm_vcpu_block(struct kvm_vcpu *vcpu);
 312 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
 313 void kvm_resched(struct kvm_vcpu *vcpu);
 314 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 315 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 316 void kvm_flush_remote_tlbs(struct kvm *kvm);
 317 void kvm_reload_remote_mmus(struct kvm *kvm);
 318
 319 long kvm_arch_dev_ioctl(struct file *filp,
 320                         unsigned int ioctl, unsigned long arg);
 321 long kvm_arch_vcpu_ioctl(struct file *filp,
 322                          unsigned int ioctl, unsigned long arg);
 323
 324 int kvm_dev_ioctl_check_extension(long ext);
 325
 326 int kvm_get_dirty_log(struct kvm *kvm,
 327                         struct kvm_dirty_log *log, int *is_dirty);
 328 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 329                                 struct kvm_dirty_log *log);
 330
 331 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 332                                    struct
 333                                    kvm_userspace_memory_region *mem,
 334                                    int user_alloc);
 335 long kvm_arch_vm_ioctl(struct file *filp,
 336                        unsigned int ioctl, unsigned long arg);
 337
 338 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 339 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 340
 341 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 342                                     struct kvm_translation *tr);
 343
 344 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 345 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 346 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 347                                   struct kvm_sregs *sregs);
 348 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 349                                   struct kvm_sregs *sregs);
 350 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 351                                     struct kvm_mp_state *mp_state);
 352 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 353                                     struct kvm_mp_state *mp_state);
 354 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 355                                         struct kvm_guest_debug *dbg);
 356 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
 357
 358 int kvm_arch_init(void *opaque);
 359 void kvm_arch_exit(void);
 360
 361 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
 362 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
 363
 364 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
 365 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 366 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 367 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
 368 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
 369 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
 370
 371 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);
 372 int kvm_arch_hardware_enable(void *garbage);
 373 void kvm_arch_hardware_disable(void *garbage);
 374 int kvm_arch_hardware_setup(void);
 375 void kvm_arch_hardware_unsetup(void);
 376 void kvm_arch_check_processor_compat(void *rtn);
 377 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
 378
 379 void kvm_free_physmem(struct kvm *kvm);
 380
 381 struct  kvm *kvm_arch_create_vm(void);
 382 void kvm_arch_destroy_vm(struct kvm *kvm);
 383 void kvm_free_all_assigned_devices(struct kvm *kvm);
 384 void kvm_arch_sync_events(struct kvm *kvm);
 385
 386 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
 387 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
 388
 389 int kvm_is_mmio_pfn(pfn_t pfn);
 390
 391 struct kvm_irq_ack_notifier {
 392         struct hlist_node link;
 393         unsigned gsi;
 394         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
 395 };
 396
 397 #define KVM_ASSIGNED_MSIX_PENDING               0x1
 398 struct kvm_guest_msix_entry {
 399         u32 vector;
 400         u16 entry;
 401         u16 flags;
 402 };
 403
 404 struct kvm_assigned_dev_kernel {
 405         struct kvm_irq_ack_notifier ack_notifier;
 406         struct work_struct interrupt_work;
 407         struct list_head list;
 408         int assigned_dev_id;
 409         int host_segnr;
 410         int host_busnr;
 411         int host_devfn;
 412         unsigned int entries_nr;
 413         int host_irq;
 414         bool host_irq_disabled;
 415         struct msix_entry *host_msix_entries;
 416         int guest_irq;
 417         struct kvm_guest_msix_entry *guest_msix_entries;
 418         unsigned long irq_requested_type;
 419         int irq_source_id;
 420         int flags;
 421         struct pci_dev *dev;
 422         struct kvm *kvm;
 423         spinlock_t assigned_dev_lock;
 424 };
 425
 426 struct kvm_irq_mask_notifier {
 427         void (*func)(struct kvm_irq_mask_notifier *kimn, bool masked);
 428         int irq;
 429         struct hlist_node link;
 430 };
 431
 432 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
 433                                     struct kvm_irq_mask_notifier *kimn);
 434 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 435                                       struct kvm_irq_mask_notifier *kimn);
 436 void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask);
 437
 438 #ifdef __KVM_HAVE_IOAPIC
 439 void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
 440                                    union kvm_ioapic_redirect_entry *entry,
 441                                    unsigned long *deliver_bitmask);
 442 #endif
 443 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level);
 444 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
 445 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 446                                    struct kvm_irq_ack_notifier *kian);
 447 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
 448                                    struct kvm_irq_ack_notifier *kian);
 449 int kvm_request_irq_source_id(struct kvm *kvm);
 450 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
 451
 452 /* For vcpu->arch.iommu_flags */
 453 #define KVM_IOMMU_CACHE_COHERENCY       0x1
 454
 455 #ifdef CONFIG_IOMMU_API
 456 int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
 457 int kvm_iommu_map_guest(struct kvm *kvm);
 458 int kvm_iommu_unmap_guest(struct kvm *kvm);
 459 int kvm_assign_device(struct kvm *kvm,
 460                       struct kvm_assigned_dev_kernel *assigned_dev);
 461 int kvm_deassign_device(struct kvm *kvm,
 462                         struct kvm_assigned_dev_kernel *assigned_dev);
 463 #else /* CONFIG_IOMMU_API */
 464 static inline int kvm_iommu_map_pages(struct kvm *kvm,
 465                                       gfn_t base_gfn,
 466                                       unsigned long npages)
 467 {
 468         return 0;
 469 }
 470
 471 static inline int kvm_iommu_map_guest(struct kvm *kvm)
 472 {
 473         return -ENODEV;
 474 }
 475
 476 static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
 477 {
 478         return 0;
 479 }
 480
 481 static inline int kvm_assign_device(struct kvm *kvm,
 482                 struct kvm_assigned_dev_kernel *assigned_dev)
 483 {
 484         return 0;
 485 }
 486
 487 static inline int kvm_deassign_device(struct kvm *kvm,
 488                 struct kvm_assigned_dev_kernel *assigned_dev)
 489 {
 490         return 0;
 491 }
 492 #endif /* CONFIG_IOMMU_API */
 493
 494 static inline void kvm_guest_enter(void)
 495 {
 496         account_system_vtime(current);
 497         current->flags |= PF_VCPU;
 498 }
 499
 500 static inline void kvm_guest_exit(void)
 501 {
 502         account_system_vtime(current);
 503         current->flags &= ~PF_VCPU;
 504 }
 505
 506 static inline gpa_t gfn_to_gpa(gfn_t gfn)
 507 {
 508         return (gpa_t)gfn << PAGE_SHIFT;
 509 }
 510
 511 static inline hpa_t pfn_to_hpa(pfn_t pfn)
 512 {
 513         return (hpa_t)pfn << PAGE_SHIFT;
 514 }
 515
 516 static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
 517 {
 518         set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
 519 }
 520
 521 enum kvm_stat_kind {
 522         KVM_STAT_VM,
 523         KVM_STAT_VCPU,
 524 };
 525
 526 struct kvm_stats_debugfs_item {
 527         const char *name;
 528         int offset;
 529         enum kvm_stat_kind kind;
 530         struct dentry *dentry;
 531 };
 532 extern struct kvm_stats_debugfs_item debugfs_entries[];
 533 extern struct dentry *kvm_debugfs_dir;
 534
 535 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 536 static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_seq)
 537 {
 538         if (unlikely(vcpu->kvm->mmu_notifier_count))
 539                 return 1;
 540         /*
 541          * Both reads happen under the mmu_lock and both values are
 542          * modified under mmu_lock, so there's no need of smb_rmb()
 543          * here in between, otherwise mmu_notifier_count should be
 544          * read before mmu_notifier_seq, see
 545          * mmu_notifier_invalidate_range_end write side.
 546          */
 547         if (vcpu->kvm->mmu_notifier_seq != mmu_seq)
 548                 return 1;
 549         return 0;
 550 }
 551 #endif
 552
 553 #ifndef KVM_ARCH_HAS_UNALIAS_INSTANTIATION
 554 #define unalias_gfn_instantiation unalias_gfn
 555 #endif
 556
 557 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 558
 559 #define KVM_MAX_IRQ_ROUTES 1024
 560
 561 int kvm_setup_default_irq_routing(struct kvm *kvm);
 562 int kvm_set_irq_routing(struct kvm *kvm,
 563                         const struct kvm_irq_routing_entry *entries,
 564                         unsigned nr,
 565                         unsigned flags);
 566 void kvm_free_irq_routing(struct kvm *kvm);
 567
 568 #else
 569
 570 static inline void kvm_free_irq_routing(struct kvm *kvm) {}
 571
 572 #endif
 573
 574 #ifdef CONFIG_HAVE_KVM_EVENTFD
 575
 576 void kvm_eventfd_init(struct kvm *kvm);
 577 int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags);
 578 void kvm_irqfd_release(struct kvm *kvm);
 579 int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
 580
 581 #else
 582
 583 static inline void kvm_eventfd_init(struct kvm *kvm) {}
 584 static inline int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags)
 585 {
 586         return -EINVAL;
 587 }
 588
 589 static inline void kvm_irqfd_release(struct kvm *kvm) {}
 590 static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
 591 {
 592         return -ENOSYS;
 593 }
 594
 595 #endif /* CONFIG_HAVE_KVM_EVENTFD */
 596
 597 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
 598 static inline bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
 599 {
 600         return vcpu->kvm->bsp_vcpu_id == vcpu->vcpu_id;
 601 }
 602 #endif
 603
 604 #ifdef __KVM_HAVE_DEVICE_ASSIGNMENT
 605
 606 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 607                                   unsigned long arg);
 608
 609 #else
 610
 611 static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 612                                                 unsigned long arg)
 613 {
 614         return -ENOTTY;
 615 }
 616
 617 #endif
 618
 619 #endif
 620