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