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 <linux/slab.h>
  20 #include <linux/rcupdate.h>
  21 #include <asm/signal.h>
  22
  23 #include <linux/kvm.h>
  24 #include <linux/kvm_para.h>
  25
  26 #include <linux/kvm_types.h>
  27
  28 #include <asm/kvm_host.h>
  29
  30 #ifndef KVM_MMIO_SIZE
  31 #define KVM_MMIO_SIZE 8
  32 #endif
  33
  34 /*
  35  * vcpu->requests bit members
  36  */
  37 #define KVM_REQ_TLB_FLUSH          0
  38 #define KVM_REQ_MIGRATE_TIMER      1
  39 #define KVM_REQ_REPORT_TPR_ACCESS  2
  40 #define KVM_REQ_MMU_RELOAD         3
  41 #define KVM_REQ_TRIPLE_FAULT       4
  42 #define KVM_REQ_PENDING_TIMER      5
  43 #define KVM_REQ_UNHALT             6
  44 #define KVM_REQ_MMU_SYNC           7
  45 #define KVM_REQ_CLOCK_UPDATE       8
  46 #define KVM_REQ_KICK               9
  47 #define KVM_REQ_DEACTIVATE_FPU    10
  48 #define KVM_REQ_EVENT             11
  49 #define KVM_REQ_APF_HALT          12
  50 #define KVM_REQ_STEAL_UPDATE      13
  51
  52 #define KVM_USERSPACE_IRQ_SOURCE_ID     0
  53
  54 struct kvm;
  55 struct kvm_vcpu;
  56 extern struct kmem_cache *kvm_vcpu_cache;
  57
  58 /*
  59  * It would be nice to use something smarter than a linear search, TBD...
  60  * Thankfully we dont expect many devices to register (famous last words :),
  61  * so until then it will suffice.  At least its abstracted so we can change
  62  * in one place.
  63  */
  64 struct kvm_io_bus {
  65         int                   dev_count;
  66 #define NR_IOBUS_DEVS 300
  67         struct kvm_io_device *devs[NR_IOBUS_DEVS];
  68 };
  69
  70 enum kvm_bus {
  71         KVM_MMIO_BUS,
  72         KVM_PIO_BUS,
  73         KVM_NR_BUSES
  74 };
  75
  76 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
  77                      int len, const void *val);
  78 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len,
  79                     void *val);
  80 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
  81                             struct kvm_io_device *dev);
  82 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
  83                               struct kvm_io_device *dev);
  84
  85 #ifdef CONFIG_KVM_ASYNC_PF
  86 struct kvm_async_pf {
  87         struct work_struct work;
  88         struct list_head link;
  89         struct list_head queue;
  90         struct kvm_vcpu *vcpu;
  91         struct mm_struct *mm;
  92         gva_t gva;
  93         unsigned long addr;
  94         struct kvm_arch_async_pf arch;
  95         struct page *page;
  96         bool done;
  97 };
  98
  99 void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);
 100 void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu);
 101 int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
 102                        struct kvm_arch_async_pf *arch);
 103 int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
 104 #endif
 105
 106 enum {
 107         OUTSIDE_GUEST_MODE,
 108         IN_GUEST_MODE,
 109         EXITING_GUEST_MODE
 110 };
 111
 112 struct kvm_vcpu {
 113         struct kvm *kvm;
 114 #ifdef CONFIG_PREEMPT_NOTIFIERS
 115         struct preempt_notifier preempt_notifier;
 116 #endif
 117         int cpu;
 118         int vcpu_id;
 119         int srcu_idx;
 120         int mode;
 121         unsigned long requests;
 122         unsigned long guest_debug;
 123
 124         struct mutex mutex;
 125         struct kvm_run *run;
 126
 127         int fpu_active;
 128         int guest_fpu_loaded, guest_xcr0_loaded;
 129         wait_queue_head_t wq;
 130         struct pid *pid;
 131         int sigset_active;
 132         sigset_t sigset;
 133         struct kvm_vcpu_stat stat;
 134
 135 #ifdef CONFIG_HAS_IOMEM
 136         int mmio_needed;
 137         int mmio_read_completed;
 138         int mmio_is_write;
 139         int mmio_size;
 140         int mmio_index;
 141         unsigned char mmio_data[KVM_MMIO_SIZE];
 142         gpa_t mmio_phys_addr;
 143 #endif
 144
 145 #ifdef CONFIG_KVM_ASYNC_PF
 146         struct {
 147                 u32 queued;
 148                 struct list_head queue;
 149                 struct list_head done;
 150                 spinlock_t lock;
 151         } async_pf;
 152 #endif
 153
 154         struct kvm_vcpu_arch arch;
 155 };
 156
 157 static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
 158 {
 159         return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
 160 }
 161
 162 /*
 163  * Some of the bitops functions do not support too long bitmaps.
 164  * This number must be determined not to exceed such limits.
 165  */
 166 #define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
 167
 168 struct kvm_lpage_info {
 169         unsigned long rmap_pde;
 170         int write_count;
 171 };
 172
 173 struct kvm_memory_slot {
 174         gfn_t base_gfn;
 175         unsigned long npages;
 176         unsigned long flags;
 177         unsigned long *rmap;
 178         unsigned long *dirty_bitmap;
 179         unsigned long *dirty_bitmap_head;
 180         struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1];
 181         unsigned long userspace_addr;
 182         int user_alloc;
 183         int id;
 184 };
 185
 186 static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
 187 {
 188         return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 189 }
 190
 191 struct kvm_kernel_irq_routing_entry {
 192         u32 gsi;
 193         u32 type;
 194         int (*set)(struct kvm_kernel_irq_routing_entry *e,
 195                    struct kvm *kvm, int irq_source_id, int level);
 196         union {
 197                 struct {
 198                         unsigned irqchip;
 199                         unsigned pin;
 200                 } irqchip;
 201                 struct msi_msg msi;
 202         };
 203         struct hlist_node link;
 204 };
 205
 206 #ifdef __KVM_HAVE_IOAPIC
 207
 208 struct kvm_irq_routing_table {
 209         int chip[KVM_NR_IRQCHIPS][KVM_IOAPIC_NUM_PINS];
 210         struct kvm_kernel_irq_routing_entry *rt_entries;
 211         u32 nr_rt_entries;
 212         /*
 213          * Array indexed by gsi. Each entry contains list of irq chips
 214          * the gsi is connected to.
 215          */
 216         struct hlist_head map[0];
 217 };
 218
 219 #else
 220
 221 struct kvm_irq_routing_table {};
 222
 223 #endif
 224
 225 struct kvm_memslots {
 226         int nmemslots;
 227         u64 generation;
 228         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
 229                                         KVM_PRIVATE_MEM_SLOTS];
 230 };
 231
 232 struct kvm {
 233         spinlock_t mmu_lock;
 234         struct mutex slots_lock;
 235         struct mm_struct *mm; /* userspace tied to this vm */
 236         struct kvm_memslots *memslots;
 237         struct srcu_struct srcu;
 238 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
 239         u32 bsp_vcpu_id;
 240         struct kvm_vcpu *bsp_vcpu;
 241 #endif
 242         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 243         atomic_t online_vcpus;
 244         int last_boosted_vcpu;
 245         struct list_head vm_list;
 246         struct mutex lock;
 247         struct kvm_io_bus *buses[KVM_NR_BUSES];
 248 #ifdef CONFIG_HAVE_KVM_EVENTFD
 249         struct {
 250                 spinlock_t        lock;
 251                 struct list_head  items;
 252         } irqfds;
 253         struct list_head ioeventfds;
 254 #endif
 255         struct kvm_vm_stat stat;
 256         struct kvm_arch arch;
 257         atomic_t users_count;
 258 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 259         struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
 260         spinlock_t ring_lock;
 261         struct list_head coalesced_zones;
 262 #endif
 263
 264         struct mutex irq_lock;
 265 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 266         /*
 267          * Update side is protected by irq_lock and,
 268          * if configured, irqfds.lock.
 269          */
 270         struct kvm_irq_routing_table __rcu *irq_routing;
 271         struct hlist_head mask_notifier_list;
 272         struct hlist_head irq_ack_notifier_list;
 273 #endif
 274
 275 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 276         struct mmu_notifier mmu_notifier;
 277         unsigned long mmu_notifier_seq;
 278         long mmu_notifier_count;
 279 #endif
 280         long tlbs_dirty;
 281 };
 282
 283 /* The guest did something we don't support. */
 284 #define pr_unimpl(vcpu, fmt, ...)                                       \
 285  do {                                                                   \
 286         if (printk_ratelimit())                                         \
 287                 printk(KERN_ERR "kvm: %i: cpu%i " fmt,                  \
 288                        current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
 289  } while (0)
 290
 291 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 292 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 293
 294 static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
 295 {
 296         smp_rmb();
 297         return kvm->vcpus[i];
 298 }
 299
 300 #define kvm_for_each_vcpu(idx, vcpup, kvm) \
 301         for (idx = 0; \
 302              idx < atomic_read(&kvm->online_vcpus) && \
 303              (vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
 304              idx++)
 305
 306 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 307 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 308
 309 void vcpu_load(struct kvm_vcpu *vcpu);
 310 void vcpu_put(struct kvm_vcpu *vcpu);
 311
 312 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
 313                   struct module *module);
 314 void kvm_exit(void);
 315
 316 void kvm_get_kvm(struct kvm *kvm);
 317 void kvm_put_kvm(struct kvm *kvm);
 318
 319 static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
 320 {
 321         return rcu_dereference_check(kvm->memslots,
 322                         srcu_read_lock_held(&kvm->srcu)
 323                         || lockdep_is_held(&kvm->slots_lock));
 324 }
 325
 326 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 327 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 328 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 329
 330 extern struct page *bad_page;
 331 extern struct page *fault_page;
 332
 333 extern pfn_t bad_pfn;
 334 extern pfn_t fault_pfn;
 335
 336 int is_error_page(struct page *page);
 337 int is_error_pfn(pfn_t pfn);
 338 int is_hwpoison_pfn(pfn_t pfn);
 339 int is_fault_pfn(pfn_t pfn);
 340 int is_noslot_pfn(pfn_t pfn);
 341 int is_invalid_pfn(pfn_t pfn);
 342 int kvm_is_error_hva(unsigned long addr);
 343 int kvm_set_memory_region(struct kvm *kvm,
 344                           struct kvm_userspace_memory_region *mem,
 345                           int user_alloc);
 346 int __kvm_set_memory_region(struct kvm *kvm,
 347                             struct kvm_userspace_memory_region *mem,
 348                             int user_alloc);
 349 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 350                                 struct kvm_memory_slot *memslot,
 351                                 struct kvm_memory_slot old,
 352                                 struct kvm_userspace_memory_region *mem,
 353                                 int user_alloc);
 354 void kvm_arch_commit_memory_region(struct kvm *kvm,
 355                                 struct kvm_userspace_memory_region *mem,
 356                                 struct kvm_memory_slot old,
 357                                 int user_alloc);
 358 void kvm_disable_largepages(void);
 359 void kvm_arch_flush_shadow(struct kvm *kvm);
 360
 361 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
 362                             int nr_pages);
 363
 364 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 365 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
 366 void kvm_release_page_clean(struct page *page);
 367 void kvm_release_page_dirty(struct page *page);
 368 void kvm_set_page_dirty(struct page *page);
 369 void kvm_set_page_accessed(struct page *page);
 370
 371 pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr);
 372 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn);
 373 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
 374                        bool write_fault, bool *writable);
 375 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
 376 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
 377                       bool *writable);
 378 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
 379                          struct kvm_memory_slot *slot, gfn_t gfn);
 380 void kvm_release_pfn_dirty(pfn_t);
 381 void kvm_release_pfn_clean(pfn_t pfn);
 382 void kvm_set_pfn_dirty(pfn_t pfn);
 383 void kvm_set_pfn_accessed(pfn_t pfn);
 384 void kvm_get_pfn(pfn_t pfn);
 385
 386 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 387                         int len);
 388 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
 389                           unsigned long len);
 390 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
 391 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 392                            void *data, unsigned long len);
 393 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 394                          int offset, int len);
 395 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 396                     unsigned long len);
 397 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 398                            void *data, unsigned long len);
 399 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 400                               gpa_t gpa);
 401 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
 402 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
 403 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 404 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
 405 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
 406 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 407 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
 408                              gfn_t gfn);
 409
 410 void kvm_vcpu_block(struct kvm_vcpu *vcpu);
 411 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
 412 void kvm_resched(struct kvm_vcpu *vcpu);
 413 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 414 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 415
 416 void kvm_flush_remote_tlbs(struct kvm *kvm);
 417 void kvm_reload_remote_mmus(struct kvm *kvm);
 418
 419 long kvm_arch_dev_ioctl(struct file *filp,
 420                         unsigned int ioctl, unsigned long arg);
 421 long kvm_arch_vcpu_ioctl(struct file *filp,
 422                          unsigned int ioctl, unsigned long arg);
 423
 424 int kvm_dev_ioctl_check_extension(long ext);
 425
 426 int kvm_get_dirty_log(struct kvm *kvm,
 427                         struct kvm_dirty_log *log, int *is_dirty);
 428 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 429                                 struct kvm_dirty_log *log);
 430
 431 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 432                                    struct
 433                                    kvm_userspace_memory_region *mem,
 434                                    int user_alloc);
 435 long kvm_arch_vm_ioctl(struct file *filp,
 436                        unsigned int ioctl, unsigned long arg);
 437
 438 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 439 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 440
 441 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 442                                     struct kvm_translation *tr);
 443
 444 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 445 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 446 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 447                                   struct kvm_sregs *sregs);
 448 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 449                                   struct kvm_sregs *sregs);
 450 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 451                                     struct kvm_mp_state *mp_state);
 452 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 453                                     struct kvm_mp_state *mp_state);
 454 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 455                                         struct kvm_guest_debug *dbg);
 456 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
 457
 458 int kvm_arch_init(void *opaque);
 459 void kvm_arch_exit(void);
 460
 461 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
 462 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
 463
 464 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
 465 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 466 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 467 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
 468 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
 469 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
 470
 471 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);
 472 int kvm_arch_hardware_enable(void *garbage);
 473 void kvm_arch_hardware_disable(void *garbage);
 474 int kvm_arch_hardware_setup(void);
 475 void kvm_arch_hardware_unsetup(void);
 476 void kvm_arch_check_processor_compat(void *rtn);
 477 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
 478
 479 void kvm_free_physmem(struct kvm *kvm);
 480
 481 #ifndef __KVM_HAVE_ARCH_VM_ALLOC
 482 static inline struct kvm *kvm_arch_alloc_vm(void)
 483 {
 484         return kzalloc(sizeof(struct kvm), GFP_KERNEL);
 485 }
 486
 487 static inline void kvm_arch_free_vm(struct kvm *kvm)
 488 {
 489         kfree(kvm);
 490 }
 491 #endif
 492
 493 int kvm_arch_init_vm(struct kvm *kvm);
 494 void kvm_arch_destroy_vm(struct kvm *kvm);
 495 void kvm_free_all_assigned_devices(struct kvm *kvm);
 496 void kvm_arch_sync_events(struct kvm *kvm);
 497
 498 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
 499 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
 500
 501 int kvm_is_mmio_pfn(pfn_t pfn);
 502
 503 struct kvm_irq_ack_notifier {
 504         struct hlist_node link;
 505         unsigned gsi;
 506         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
 507 };
 508
 509 struct kvm_assigned_dev_kernel {
 510         struct kvm_irq_ack_notifier ack_notifier;
 511         struct list_head list;
 512         int assigned_dev_id;
 513         int host_segnr;
 514         int host_busnr;
 515         int host_devfn;
 516         unsigned int entries_nr;
 517         int host_irq;
 518         bool host_irq_disabled;
 519         struct msix_entry *host_msix_entries;
 520         int guest_irq;
 521         struct msix_entry *guest_msix_entries;
 522         unsigned long irq_requested_type;
 523         int irq_source_id;
 524         int flags;
 525         struct pci_dev *dev;
 526         struct kvm *kvm;
 527         spinlock_t intx_lock;
 528         char irq_name[32];
 529         struct pci_saved_state *pci_saved_state;
 530 };
 531
 532 struct kvm_irq_mask_notifier {
 533         void (*func)(struct kvm_irq_mask_notifier *kimn, bool masked);
 534         int irq;
 535         struct hlist_node link;
 536 };
 537
 538 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
 539                                     struct kvm_irq_mask_notifier *kimn);
 540 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 541                                       struct kvm_irq_mask_notifier *kimn);
 542 void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
 543                              bool mask);
 544
 545 #ifdef __KVM_HAVE_IOAPIC
 546 void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
 547                                    union kvm_ioapic_redirect_entry *entry,
 548                                    unsigned long *deliver_bitmask);
 549 #endif
 550 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level);
 551 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
 552                 int irq_source_id, int level);
 553 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
 554 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 555                                    struct kvm_irq_ack_notifier *kian);
 556 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
 557                                    struct kvm_irq_ack_notifier *kian);
 558 int kvm_request_irq_source_id(struct kvm *kvm);
 559 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
 560
 561 /* For vcpu->arch.iommu_flags */
 562 #define KVM_IOMMU_CACHE_COHERENCY       0x1
 563
 564 #ifdef CONFIG_IOMMU_API
 565 int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
 566 int kvm_iommu_map_guest(struct kvm *kvm);
 567 int kvm_iommu_unmap_guest(struct kvm *kvm);
 568 int kvm_assign_device(struct kvm *kvm,
 569                       struct kvm_assigned_dev_kernel *assigned_dev);
 570 int kvm_deassign_device(struct kvm *kvm,
 571                         struct kvm_assigned_dev_kernel *assigned_dev);
 572 #else /* CONFIG_IOMMU_API */
 573 static inline int kvm_iommu_map_pages(struct kvm *kvm,
 574                                       struct kvm_memory_slot *slot)
 575 {
 576         return 0;
 577 }
 578
 579 static inline int kvm_iommu_map_guest(struct kvm *kvm)
 580 {
 581         return -ENODEV;
 582 }
 583
 584 static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
 585 {
 586         return 0;
 587 }
 588
 589 static inline int kvm_assign_device(struct kvm *kvm,
 590                 struct kvm_assigned_dev_kernel *assigned_dev)
 591 {
 592         return 0;
 593 }
 594
 595 static inline int kvm_deassign_device(struct kvm *kvm,
 596                 struct kvm_assigned_dev_kernel *assigned_dev)
 597 {
 598         return 0;
 599 }
 600 #endif /* CONFIG_IOMMU_API */
 601
 602 static inline void kvm_guest_enter(void)
 603 {
 604         BUG_ON(preemptible());
 605         account_system_vtime(current);
 606         current->flags |= PF_VCPU;
 607         /* KVM does not hold any references to rcu protected data when it
 608          * switches CPU into a guest mode. In fact switching to a guest mode
 609          * is very similar to exiting to userspase from rcu point of view. In
 610          * addition CPU may stay in a guest mode for quite a long time (up to
 611          * one time slice). Lets treat guest mode as quiescent state, just like
 612          * we do with user-mode execution.
 613          */
 614         rcu_virt_note_context_switch(smp_processor_id());
 615 }
 616
 617 static inline void kvm_guest_exit(void)
 618 {
 619         account_system_vtime(current);
 620         current->flags &= ~PF_VCPU;
 621 }
 622
 623 static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
 624 {
 625         return gfn_to_memslot(kvm, gfn)->id;
 626 }
 627
 628 static inline unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
 629                                                gfn_t gfn)
 630 {
 631         return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
 632 }
 633
 634 static inline gpa_t gfn_to_gpa(gfn_t gfn)
 635 {
 636         return (gpa_t)gfn << PAGE_SHIFT;
 637 }
 638
 639 static inline gfn_t gpa_to_gfn(gpa_t gpa)
 640 {
 641         return (gfn_t)(gpa >> PAGE_SHIFT);
 642 }
 643
 644 static inline hpa_t pfn_to_hpa(pfn_t pfn)
 645 {
 646         return (hpa_t)pfn << PAGE_SHIFT;
 647 }
 648
 649 static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
 650 {
 651         set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
 652 }
 653
 654 enum kvm_stat_kind {
 655         KVM_STAT_VM,
 656         KVM_STAT_VCPU,
 657 };
 658
 659 struct kvm_stats_debugfs_item {
 660         const char *name;
 661         int offset;
 662         enum kvm_stat_kind kind;
 663         struct dentry *dentry;
 664 };
 665 extern struct kvm_stats_debugfs_item debugfs_entries[];
 666 extern struct dentry *kvm_debugfs_dir;
 667
 668 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 669 static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_seq)
 670 {
 671         if (unlikely(vcpu->kvm->mmu_notifier_count))
 672                 return 1;
 673         /*
 674          * Both reads happen under the mmu_lock and both values are
 675          * modified under mmu_lock, so there's no need of smb_rmb()
 676          * here in between, otherwise mmu_notifier_count should be
 677          * read before mmu_notifier_seq, see
 678          * mmu_notifier_invalidate_range_end write side.
 679          */
 680         if (vcpu->kvm->mmu_notifier_seq != mmu_seq)
 681                 return 1;
 682         return 0;
 683 }
 684 #endif
 685
 686 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 687
 688 #define KVM_MAX_IRQ_ROUTES 1024
 689
 690 int kvm_setup_default_irq_routing(struct kvm *kvm);
 691 int kvm_set_irq_routing(struct kvm *kvm,
 692                         const struct kvm_irq_routing_entry *entries,
 693                         unsigned nr,
 694                         unsigned flags);
 695 void kvm_free_irq_routing(struct kvm *kvm);
 696
 697 #else
 698
 699 static inline void kvm_free_irq_routing(struct kvm *kvm) {}
 700
 701 #endif
 702
 703 #ifdef CONFIG_HAVE_KVM_EVENTFD
 704
 705 void kvm_eventfd_init(struct kvm *kvm);
 706 int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags);
 707 void kvm_irqfd_release(struct kvm *kvm);
 708 void kvm_irq_routing_update(struct kvm *, struct kvm_irq_routing_table *);
 709 int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
 710
 711 #else
 712
 713 static inline void kvm_eventfd_init(struct kvm *kvm) {}
 714
 715 static inline int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags)
 716 {
 717         return -EINVAL;
 718 }
 719
 720 static inline void kvm_irqfd_release(struct kvm *kvm) {}
 721
 722 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 723 static inline void kvm_irq_routing_update(struct kvm *kvm,
 724                                           struct kvm_irq_routing_table *irq_rt)
 725 {
 726         rcu_assign_pointer(kvm->irq_routing, irq_rt);
 727 }
 728 #endif
 729
 730 static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
 731 {
 732         return -ENOSYS;
 733 }
 734
 735 #endif /* CONFIG_HAVE_KVM_EVENTFD */
 736
 737 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
 738 static inline bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
 739 {
 740         return vcpu->kvm->bsp_vcpu_id == vcpu->vcpu_id;
 741 }
 742 #endif
 743
 744 #ifdef __KVM_HAVE_DEVICE_ASSIGNMENT
 745
 746 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 747                                   unsigned long arg);
 748
 749 #else
 750
 751 static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 752                                                 unsigned long arg)
 753 {
 754         return -ENOTTY;
 755 }
 756
 757 #endif
 758
 759 static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
 760 {
 761         set_bit(req, &vcpu->requests);
 762 }
 763
 764 static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
 765 {
 766         if (test_bit(req, &vcpu->requests)) {
 767                 clear_bit(req, &vcpu->requests);
 768                 return true;
 769         } else {
 770                 return false;
 771         }
 772 }
 773
 774 #endif
 775