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 /*
 109  * Some of the bitops functions do not support too long bitmaps.
 110  * This number must be determined not to exceed such limits.
 111  */
 112 #define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
 113
 114 struct kvm_memory_slot {
 115         gfn_t base_gfn;
 116         unsigned long npages;
 117         unsigned long flags;
 118         unsigned long *rmap;
 119         unsigned long *dirty_bitmap;
 120         struct {
 121                 unsigned long rmap_pde;
 122                 int write_count;
 123         } *lpage_info[KVM_NR_PAGE_SIZES - 1];
 124         unsigned long userspace_addr;
 125         int user_alloc;
 126 };
 127
 128 static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
 129 {
 130         return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 131 }
 132
 133 struct kvm_kernel_irq_routing_entry {
 134         u32 gsi;
 135         u32 type;
 136         int (*set)(struct kvm_kernel_irq_routing_entry *e,
 137                    struct kvm *kvm, int irq_source_id, int level);
 138         union {
 139                 struct {
 140                         unsigned irqchip;
 141                         unsigned pin;
 142                 } irqchip;
 143                 struct msi_msg msi;
 144         };
 145         struct hlist_node link;
 146 };
 147
 148 #ifdef __KVM_HAVE_IOAPIC
 149
 150 struct kvm_irq_routing_table {
 151         int chip[KVM_NR_IRQCHIPS][KVM_IOAPIC_NUM_PINS];
 152         struct kvm_kernel_irq_routing_entry *rt_entries;
 153         u32 nr_rt_entries;
 154         /*
 155          * Array indexed by gsi. Each entry contains list of irq chips
 156          * the gsi is connected to.
 157          */
 158         struct hlist_head map[0];
 159 };
 160
 161 #else
 162
 163 struct kvm_irq_routing_table {};
 164
 165 #endif
 166
 167 struct kvm_memslots {
 168         int nmemslots;
 169         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
 170                                         KVM_PRIVATE_MEM_SLOTS];
 171 };
 172
 173 struct kvm {
 174         spinlock_t mmu_lock;
 175         raw_spinlock_t requests_lock;
 176         struct mutex slots_lock;
 177         struct mm_struct *mm; /* userspace tied to this vm */
 178         struct kvm_memslots *memslots;
 179         struct srcu_struct srcu;
 180 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
 181         u32 bsp_vcpu_id;
 182         struct kvm_vcpu *bsp_vcpu;
 183 #endif
 184         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 185         atomic_t online_vcpus;
 186         struct list_head vm_list;
 187         struct mutex lock;
 188         struct kvm_io_bus *buses[KVM_NR_BUSES];
 189 #ifdef CONFIG_HAVE_KVM_EVENTFD
 190         struct {
 191                 spinlock_t        lock;
 192                 struct list_head  items;
 193         } irqfds;
 194         struct list_head ioeventfds;
 195 #endif
 196         struct kvm_vm_stat stat;
 197         struct kvm_arch arch;
 198         atomic_t users_count;
 199 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 200         struct kvm_coalesced_mmio_dev *coalesced_mmio_dev;
 201         struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
 202 #endif
 203
 204         struct mutex irq_lock;
 205 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 206         struct kvm_irq_routing_table *irq_routing;
 207         struct hlist_head mask_notifier_list;
 208         struct hlist_head irq_ack_notifier_list;
 209 #endif
 210
 211 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 212         struct mmu_notifier mmu_notifier;
 213         unsigned long mmu_notifier_seq;
 214         long mmu_notifier_count;
 215 #endif
 216 };
 217
 218 /* The guest did something we don't support. */
 219 #define pr_unimpl(vcpu, fmt, ...)                                       \
 220  do {                                                                   \
 221         if (printk_ratelimit())                                         \
 222                 printk(KERN_ERR "kvm: %i: cpu%i " fmt,                  \
 223                        current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
 224  } while (0)
 225
 226 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 227 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 228
 229 static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
 230 {
 231         smp_rmb();
 232         return kvm->vcpus[i];
 233 }
 234
 235 #define kvm_for_each_vcpu(idx, vcpup, kvm) \
 236         for (idx = 0, vcpup = kvm_get_vcpu(kvm, idx); \
 237              idx < atomic_read(&kvm->online_vcpus) && vcpup; \
 238              vcpup = kvm_get_vcpu(kvm, ++idx))
 239
 240 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 241 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 242
 243 void vcpu_load(struct kvm_vcpu *vcpu);
 244 void vcpu_put(struct kvm_vcpu *vcpu);
 245
 246 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
 247                   struct module *module);
 248 void kvm_exit(void);
 249
 250 void kvm_get_kvm(struct kvm *kvm);
 251 void kvm_put_kvm(struct kvm *kvm);
 252
 253 static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
 254 {
 255         return rcu_dereference_check(kvm->memslots,
 256                         srcu_read_lock_held(&kvm->srcu)
 257                         || lockdep_is_held(&kvm->slots_lock));
 258 }
 259
 260 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 261 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 262 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 263
 264 extern struct page *bad_page;
 265 extern pfn_t bad_pfn;
 266
 267 int is_error_page(struct page *page);
 268 int is_error_pfn(pfn_t pfn);
 269 int kvm_is_error_hva(unsigned long addr);
 270 int kvm_set_memory_region(struct kvm *kvm,
 271                           struct kvm_userspace_memory_region *mem,
 272                           int user_alloc);
 273 int __kvm_set_memory_region(struct kvm *kvm,
 274                             struct kvm_userspace_memory_region *mem,
 275                             int user_alloc);
 276 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 277                                 struct kvm_memory_slot *memslot,
 278                                 struct kvm_memory_slot old,
 279                                 struct kvm_userspace_memory_region *mem,
 280                                 int user_alloc);
 281 void kvm_arch_commit_memory_region(struct kvm *kvm,
 282                                 struct kvm_userspace_memory_region *mem,
 283                                 struct kvm_memory_slot old,
 284                                 int user_alloc);
 285 void kvm_disable_largepages(void);
 286 void kvm_arch_flush_shadow(struct kvm *kvm);
 287 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn);
 288 gfn_t unalias_gfn_instantiation(struct kvm *kvm, gfn_t gfn);
 289
 290 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 291 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
 292 void kvm_release_page_clean(struct page *page);
 293 void kvm_release_page_dirty(struct page *page);
 294 void kvm_set_page_dirty(struct page *page);
 295 void kvm_set_page_accessed(struct page *page);
 296
 297 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
 298 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
 299                          struct kvm_memory_slot *slot, gfn_t gfn);
 300 int memslot_id(struct kvm *kvm, gfn_t gfn);
 301 void kvm_release_pfn_dirty(pfn_t);
 302 void kvm_release_pfn_clean(pfn_t pfn);
 303 void kvm_set_pfn_dirty(pfn_t pfn);
 304 void kvm_set_pfn_accessed(pfn_t pfn);
 305 void kvm_get_pfn(pfn_t pfn);
 306
 307 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 308                         int len);
 309 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
 310                           unsigned long len);
 311 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
 312 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 313                          int offset, int len);
 314 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 315                     unsigned long len);
 316 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
 317 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
 318 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 319 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
 320 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
 321 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 322
 323 void kvm_vcpu_block(struct kvm_vcpu *vcpu);
 324 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
 325 void kvm_resched(struct kvm_vcpu *vcpu);
 326 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 327 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 328 void kvm_flush_remote_tlbs(struct kvm *kvm);
 329 void kvm_reload_remote_mmus(struct kvm *kvm);
 330
 331 long kvm_arch_dev_ioctl(struct file *filp,
 332                         unsigned int ioctl, unsigned long arg);
 333 long kvm_arch_vcpu_ioctl(struct file *filp,
 334                          unsigned int ioctl, unsigned long arg);
 335
 336 int kvm_dev_ioctl_check_extension(long ext);
 337
 338 int kvm_get_dirty_log(struct kvm *kvm,
 339                         struct kvm_dirty_log *log, int *is_dirty);
 340 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 341                                 struct kvm_dirty_log *log);
 342
 343 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 344                                    struct
 345                                    kvm_userspace_memory_region *mem,
 346                                    int user_alloc);
 347 long kvm_arch_vm_ioctl(struct file *filp,
 348                        unsigned int ioctl, unsigned long arg);
 349
 350 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 351 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 352
 353 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 354                                     struct kvm_translation *tr);
 355
 356 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 357 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 358 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 359                                   struct kvm_sregs *sregs);
 360 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 361                                   struct kvm_sregs *sregs);
 362 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 363                                     struct kvm_mp_state *mp_state);
 364 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 365                                     struct kvm_mp_state *mp_state);
 366 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 367                                         struct kvm_guest_debug *dbg);
 368 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
 369
 370 int kvm_arch_init(void *opaque);
 371 void kvm_arch_exit(void);
 372
 373 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
 374 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
 375
 376 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
 377 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 378 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 379 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
 380 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
 381 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
 382
 383 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);
 384 int kvm_arch_hardware_enable(void *garbage);
 385 void kvm_arch_hardware_disable(void *garbage);
 386 int kvm_arch_hardware_setup(void);
 387 void kvm_arch_hardware_unsetup(void);
 388 void kvm_arch_check_processor_compat(void *rtn);
 389 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
 390
 391 void kvm_free_physmem(struct kvm *kvm);
 392
 393 struct  kvm *kvm_arch_create_vm(void);
 394 void kvm_arch_destroy_vm(struct kvm *kvm);
 395 void kvm_free_all_assigned_devices(struct kvm *kvm);
 396 void kvm_arch_sync_events(struct kvm *kvm);
 397
 398 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
 399 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
 400
 401 int kvm_is_mmio_pfn(pfn_t pfn);
 402
 403 struct kvm_irq_ack_notifier {
 404         struct hlist_node link;
 405         unsigned gsi;
 406         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
 407 };
 408
 409 #define KVM_ASSIGNED_MSIX_PENDING               0x1
 410 struct kvm_guest_msix_entry {
 411         u32 vector;
 412         u16 entry;
 413         u16 flags;
 414 };
 415
 416 struct kvm_assigned_dev_kernel {
 417         struct kvm_irq_ack_notifier ack_notifier;
 418         struct work_struct interrupt_work;
 419         struct list_head list;
 420         int assigned_dev_id;
 421         int host_segnr;
 422         int host_busnr;
 423         int host_devfn;
 424         unsigned int entries_nr;
 425         int host_irq;
 426         bool host_irq_disabled;
 427         struct msix_entry *host_msix_entries;
 428         int guest_irq;
 429         struct kvm_guest_msix_entry *guest_msix_entries;
 430         unsigned long irq_requested_type;
 431         int irq_source_id;
 432         int flags;
 433         struct pci_dev *dev;
 434         struct kvm *kvm;
 435         spinlock_t assigned_dev_lock;
 436 };
 437
 438 struct kvm_irq_mask_notifier {
 439         void (*func)(struct kvm_irq_mask_notifier *kimn, bool masked);
 440         int irq;
 441         struct hlist_node link;
 442 };
 443
 444 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
 445                                     struct kvm_irq_mask_notifier *kimn);
 446 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 447                                       struct kvm_irq_mask_notifier *kimn);
 448 void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask);
 449
 450 #ifdef __KVM_HAVE_IOAPIC
 451 void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
 452                                    union kvm_ioapic_redirect_entry *entry,
 453                                    unsigned long *deliver_bitmask);
 454 #endif
 455 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level);
 456 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
 457 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 458                                    struct kvm_irq_ack_notifier *kian);
 459 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
 460                                    struct kvm_irq_ack_notifier *kian);
 461 int kvm_request_irq_source_id(struct kvm *kvm);
 462 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
 463
 464 /* For vcpu->arch.iommu_flags */
 465 #define KVM_IOMMU_CACHE_COHERENCY       0x1
 466
 467 #ifdef CONFIG_IOMMU_API
 468 int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
 469 int kvm_iommu_map_guest(struct kvm *kvm);
 470 int kvm_iommu_unmap_guest(struct kvm *kvm);
 471 int kvm_assign_device(struct kvm *kvm,
 472                       struct kvm_assigned_dev_kernel *assigned_dev);
 473 int kvm_deassign_device(struct kvm *kvm,
 474                         struct kvm_assigned_dev_kernel *assigned_dev);
 475 #else /* CONFIG_IOMMU_API */
 476 static inline int kvm_iommu_map_pages(struct kvm *kvm,
 477                                       gfn_t base_gfn,
 478                                       unsigned long npages)
 479 {
 480         return 0;
 481 }
 482
 483 static inline int kvm_iommu_map_guest(struct kvm *kvm)
 484 {
 485         return -ENODEV;
 486 }
 487
 488 static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
 489 {
 490         return 0;
 491 }
 492
 493 static inline int kvm_assign_device(struct kvm *kvm,
 494                 struct kvm_assigned_dev_kernel *assigned_dev)
 495 {
 496         return 0;
 497 }
 498
 499 static inline int kvm_deassign_device(struct kvm *kvm,
 500                 struct kvm_assigned_dev_kernel *assigned_dev)
 501 {
 502         return 0;
 503 }
 504 #endif /* CONFIG_IOMMU_API */
 505
 506 static inline void kvm_guest_enter(void)
 507 {
 508         account_system_vtime(current);
 509         current->flags |= PF_VCPU;
 510 }
 511
 512 static inline void kvm_guest_exit(void)
 513 {
 514         account_system_vtime(current);
 515         current->flags &= ~PF_VCPU;
 516 }
 517
 518 static inline gpa_t gfn_to_gpa(gfn_t gfn)
 519 {
 520         return (gpa_t)gfn << PAGE_SHIFT;
 521 }
 522
 523 static inline hpa_t pfn_to_hpa(pfn_t pfn)
 524 {
 525         return (hpa_t)pfn << PAGE_SHIFT;
 526 }
 527
 528 static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
 529 {
 530         set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
 531 }
 532
 533 enum kvm_stat_kind {
 534         KVM_STAT_VM,
 535         KVM_STAT_VCPU,
 536 };
 537
 538 struct kvm_stats_debugfs_item {
 539         const char *name;
 540         int offset;
 541         enum kvm_stat_kind kind;
 542         struct dentry *dentry;
 543 };
 544 extern struct kvm_stats_debugfs_item debugfs_entries[];
 545 extern struct dentry *kvm_debugfs_dir;
 546
 547 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 548 static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_seq)
 549 {
 550         if (unlikely(vcpu->kvm->mmu_notifier_count))
 551                 return 1;
 552         /*
 553          * Both reads happen under the mmu_lock and both values are
 554          * modified under mmu_lock, so there's no need of smb_rmb()
 555          * here in between, otherwise mmu_notifier_count should be
 556          * read before mmu_notifier_seq, see
 557          * mmu_notifier_invalidate_range_end write side.
 558          */
 559         if (vcpu->kvm->mmu_notifier_seq != mmu_seq)
 560                 return 1;
 561         return 0;
 562 }
 563 #endif
 564
 565 #ifndef KVM_ARCH_HAS_UNALIAS_INSTANTIATION
 566 #define unalias_gfn_instantiation unalias_gfn
 567 #endif
 568
 569 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 570
 571 #define KVM_MAX_IRQ_ROUTES 1024
 572
 573 int kvm_setup_default_irq_routing(struct kvm *kvm);
 574 int kvm_set_irq_routing(struct kvm *kvm,
 575                         const struct kvm_irq_routing_entry *entries,
 576                         unsigned nr,
 577                         unsigned flags);
 578 void kvm_free_irq_routing(struct kvm *kvm);
 579
 580 #else
 581
 582 static inline void kvm_free_irq_routing(struct kvm *kvm) {}
 583
 584 #endif
 585
 586 #ifdef CONFIG_HAVE_KVM_EVENTFD
 587
 588 void kvm_eventfd_init(struct kvm *kvm);
 589 int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags);
 590 void kvm_irqfd_release(struct kvm *kvm);
 591 int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
 592
 593 #else
 594
 595 static inline void kvm_eventfd_init(struct kvm *kvm) {}
 596 static inline int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags)
 597 {
 598         return -EINVAL;
 599 }
 600
 601 static inline void kvm_irqfd_release(struct kvm *kvm) {}
 602 static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
 603 {
 604         return -ENOSYS;
 605 }
 606
 607 #endif /* CONFIG_HAVE_KVM_EVENTFD */
 608
 609 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
 610 static inline bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
 611 {
 612         return vcpu->kvm->bsp_vcpu_id == vcpu->vcpu_id;
 613 }
 614 #endif
 615
 616 #ifdef __KVM_HAVE_DEVICE_ASSIGNMENT
 617
 618 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 619                                   unsigned long arg);
 620
 621 #else
 622
 623 static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 624                                                 unsigned long arg)
 625 {
 626         return -ENOTTY;
 627 }
 628
 629 #endif
 630
 631 #endif
 632