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