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/bug.h>
  17 #include <linux/mm.h>
  18 #include <linux/mmu_notifier.h>
  19 #include <linux/preempt.h>
  20 #include <linux/msi.h>
  21 #include <linux/slab.h>
  22 #include <linux/rcupdate.h>
  23 #include <linux/ratelimit.h>
  24 #include <asm/signal.h>
  25
  26 #include <linux/kvm.h>
  27 #include <linux/kvm_para.h>
  28
  29 #include <linux/kvm_types.h>
  30
  31 #include <asm/kvm_host.h>
  32
  33 #ifndef KVM_MMIO_SIZE
  34 #define KVM_MMIO_SIZE 8
  35 #endif
  36
  37 /*
  38  * vcpu->requests bit members
  39  */
  40 #define KVM_REQ_TLB_FLUSH          0
  41 #define KVM_REQ_MIGRATE_TIMER      1
  42 #define KVM_REQ_REPORT_TPR_ACCESS  2
  43 #define KVM_REQ_MMU_RELOAD         3
  44 #define KVM_REQ_TRIPLE_FAULT       4
  45 #define KVM_REQ_PENDING_TIMER      5
  46 #define KVM_REQ_UNHALT             6
  47 #define KVM_REQ_MMU_SYNC           7
  48 #define KVM_REQ_CLOCK_UPDATE       8
  49 #define KVM_REQ_KICK               9
  50 #define KVM_REQ_DEACTIVATE_FPU    10
  51 #define KVM_REQ_EVENT             11
  52 #define KVM_REQ_APF_HALT          12
  53 #define KVM_REQ_STEAL_UPDATE      13
  54 #define KVM_REQ_NMI               14
  55 #define KVM_REQ_IMMEDIATE_EXIT    15
  56 #define KVM_REQ_PMU               16
  57 #define KVM_REQ_PMI               17
  58
  59 #define KVM_USERSPACE_IRQ_SOURCE_ID     0
  60
  61 struct kvm;
  62 struct kvm_vcpu;
  63 extern struct kmem_cache *kvm_vcpu_cache;
  64
  65 struct kvm_io_range {
  66         gpa_t addr;
  67         int len;
  68         struct kvm_io_device *dev;
  69 };
  70
  71 struct kvm_io_bus {
  72         int                   dev_count;
  73 #define NR_IOBUS_DEVS 300
  74         struct kvm_io_range range[NR_IOBUS_DEVS];
  75 };
  76
  77 enum kvm_bus {
  78         KVM_MMIO_BUS,
  79         KVM_PIO_BUS,
  80         KVM_NR_BUSES
  81 };
  82
  83 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
  84                      int len, const void *val);
  85 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len,
  86                     void *val);
  87 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
  88                             int len, struct kvm_io_device *dev);
  89 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
  90                               struct kvm_io_device *dev);
  91
  92 #ifdef CONFIG_KVM_ASYNC_PF
  93 struct kvm_async_pf {
  94         struct work_struct work;
  95         struct list_head link;
  96         struct list_head queue;
  97         struct kvm_vcpu *vcpu;
  98         struct mm_struct *mm;
  99         gva_t gva;
 100         unsigned long addr;
 101         struct kvm_arch_async_pf arch;
 102         struct page *page;
 103         bool done;
 104 };
 105
 106 void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);
 107 void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu);
 108 int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
 109                        struct kvm_arch_async_pf *arch);
 110 int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
 111 #endif
 112
 113 enum {
 114         OUTSIDE_GUEST_MODE,
 115         IN_GUEST_MODE,
 116         EXITING_GUEST_MODE
 117 };
 118
 119 struct kvm_vcpu {
 120         struct kvm *kvm;
 121 #ifdef CONFIG_PREEMPT_NOTIFIERS
 122         struct preempt_notifier preempt_notifier;
 123 #endif
 124         int cpu;
 125         int vcpu_id;
 126         int srcu_idx;
 127         int mode;
 128         unsigned long requests;
 129         unsigned long guest_debug;
 130
 131         struct mutex mutex;
 132         struct kvm_run *run;
 133
 134         int fpu_active;
 135         int guest_fpu_loaded, guest_xcr0_loaded;
 136         wait_queue_head_t wq;
 137         struct pid *pid;
 138         int sigset_active;
 139         sigset_t sigset;
 140         struct kvm_vcpu_stat stat;
 141
 142 #ifdef CONFIG_HAS_IOMEM
 143         int mmio_needed;
 144         int mmio_read_completed;
 145         int mmio_is_write;
 146         int mmio_size;
 147         int mmio_index;
 148         unsigned char mmio_data[KVM_MMIO_SIZE];
 149         gpa_t mmio_phys_addr;
 150 #endif
 151
 152 #ifdef CONFIG_KVM_ASYNC_PF
 153         struct {
 154                 u32 queued;
 155                 struct list_head queue;
 156                 struct list_head done;
 157                 spinlock_t lock;
 158         } async_pf;
 159 #endif
 160
 161         struct kvm_vcpu_arch arch;
 162 };
 163
 164 static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
 165 {
 166         return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
 167 }
 168
 169 /*
 170  * Some of the bitops functions do not support too long bitmaps.
 171  * This number must be determined not to exceed such limits.
 172  */
 173 #define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
 174
 175 struct kvm_memory_slot {
 176         gfn_t base_gfn;
 177         unsigned long npages;
 178         unsigned long flags;
 179         unsigned long *rmap;
 180         unsigned long *dirty_bitmap;
 181         unsigned long *dirty_bitmap_head;
 182         unsigned long nr_dirty_pages;
 183         struct kvm_arch_memory_slot arch;
 184         unsigned long userspace_addr;
 185         int user_alloc;
 186         int id;
 187 };
 188
 189 static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
 190 {
 191         return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 192 }
 193
 194 struct kvm_kernel_irq_routing_entry {
 195         u32 gsi;
 196         u32 type;
 197         int (*set)(struct kvm_kernel_irq_routing_entry *e,
 198                    struct kvm *kvm, int irq_source_id, int level);
 199         union {
 200                 struct {
 201                         unsigned irqchip;
 202                         unsigned pin;
 203                 } irqchip;
 204                 struct msi_msg msi;
 205         };
 206         struct hlist_node link;
 207 };
 208
 209 #ifdef __KVM_HAVE_IOAPIC
 210
 211 struct kvm_irq_routing_table {
 212         int chip[KVM_NR_IRQCHIPS][KVM_IOAPIC_NUM_PINS];
 213         struct kvm_kernel_irq_routing_entry *rt_entries;
 214         u32 nr_rt_entries;
 215         /*
 216          * Array indexed by gsi. Each entry contains list of irq chips
 217          * the gsi is connected to.
 218          */
 219         struct hlist_head map[0];
 220 };
 221
 222 #else
 223
 224 struct kvm_irq_routing_table {};
 225
 226 #endif
 227
 228 #ifndef KVM_MEM_SLOTS_NUM
 229 #define KVM_MEM_SLOTS_NUM (KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 230 #endif
 231
 232 /*
 233  * Note:
 234  * memslots are not sorted by id anymore, please use id_to_memslot()
 235  * to get the memslot by its id.
 236  */
 237 struct kvm_memslots {
 238         u64 generation;
 239         struct kvm_memory_slot memslots[KVM_MEM_SLOTS_NUM];
 240         /* The mapping table from slot id to the index in memslots[]. */
 241         int id_to_index[KVM_MEM_SLOTS_NUM];
 242 };
 243
 244 struct kvm {
 245         spinlock_t mmu_lock;
 246         struct mutex slots_lock;
 247         struct mm_struct *mm; /* userspace tied to this vm */
 248         struct kvm_memslots *memslots;
 249         struct srcu_struct srcu;
 250 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
 251         u32 bsp_vcpu_id;
 252 #endif
 253         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 254         atomic_t online_vcpus;
 255         int last_boosted_vcpu;
 256         struct list_head vm_list;
 257         struct mutex lock;
 258         struct kvm_io_bus *buses[KVM_NR_BUSES];
 259 #ifdef CONFIG_HAVE_KVM_EVENTFD
 260         struct {
 261                 spinlock_t        lock;
 262                 struct list_head  items;
 263         } irqfds;
 264         struct list_head ioeventfds;
 265 #endif
 266         struct kvm_vm_stat stat;
 267         struct kvm_arch arch;
 268         atomic_t users_count;
 269 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 270         struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
 271         spinlock_t ring_lock;
 272         struct list_head coalesced_zones;
 273 #endif
 274
 275         struct mutex irq_lock;
 276 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 277         /*
 278          * Update side is protected by irq_lock and,
 279          * if configured, irqfds.lock.
 280          */
 281         struct kvm_irq_routing_table __rcu *irq_routing;
 282         struct hlist_head mask_notifier_list;
 283         struct hlist_head irq_ack_notifier_list;
 284 #endif
 285
 286 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 287         struct mmu_notifier mmu_notifier;
 288         unsigned long mmu_notifier_seq;
 289         long mmu_notifier_count;
 290 #endif
 291         long tlbs_dirty;
 292 };
 293
 294 /* The guest did something we don't support. */
 295 #define pr_unimpl(vcpu, fmt, ...)                                       \
 296         pr_err_ratelimited("kvm: %i: cpu%i " fmt,                       \
 297                            current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__)
 298
 299 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 300 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 301
 302 static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
 303 {
 304         smp_rmb();
 305         return kvm->vcpus[i];
 306 }
 307
 308 #define kvm_for_each_vcpu(idx, vcpup, kvm) \
 309         for (idx = 0; \
 310              idx < atomic_read(&kvm->online_vcpus) && \
 311              (vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
 312              idx++)
 313
 314 #define kvm_for_each_memslot(memslot, slots)    \
 315         for (memslot = &slots->memslots[0];     \
 316               memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\
 317                 memslot++)
 318
 319 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 320 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 321
 322 void vcpu_load(struct kvm_vcpu *vcpu);
 323 void vcpu_put(struct kvm_vcpu *vcpu);
 324
 325 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
 326                   struct module *module);
 327 void kvm_exit(void);
 328
 329 void kvm_get_kvm(struct kvm *kvm);
 330 void kvm_put_kvm(struct kvm *kvm);
 331 void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new);
 332
 333 static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
 334 {
 335         return rcu_dereference_check(kvm->memslots,
 336                         srcu_read_lock_held(&kvm->srcu)
 337                         || lockdep_is_held(&kvm->slots_lock));
 338 }
 339
 340 static inline struct kvm_memory_slot *
 341 id_to_memslot(struct kvm_memslots *slots, int id)
 342 {
 343         int index = slots->id_to_index[id];
 344         struct kvm_memory_slot *slot;
 345
 346         slot = &slots->memslots[index];
 347
 348         WARN_ON(slot->id != id);
 349         return slot;
 350 }
 351
 352 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 353 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 354 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 355
 356 extern struct page *bad_page;
 357 extern struct page *fault_page;
 358
 359 extern pfn_t bad_pfn;
 360 extern pfn_t fault_pfn;
 361
 362 int is_error_page(struct page *page);
 363 int is_error_pfn(pfn_t pfn);
 364 int is_hwpoison_pfn(pfn_t pfn);
 365 int is_fault_pfn(pfn_t pfn);
 366 int is_noslot_pfn(pfn_t pfn);
 367 int is_invalid_pfn(pfn_t pfn);
 368 int kvm_is_error_hva(unsigned long addr);
 369 int kvm_set_memory_region(struct kvm *kvm,
 370                           struct kvm_userspace_memory_region *mem,
 371                           int user_alloc);
 372 int __kvm_set_memory_region(struct kvm *kvm,
 373                             struct kvm_userspace_memory_region *mem,
 374                             int user_alloc);
 375 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
 376                            struct kvm_memory_slot *dont);
 377 int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages);
 378 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 379                                 struct kvm_memory_slot *memslot,
 380                                 struct kvm_memory_slot old,
 381                                 struct kvm_userspace_memory_region *mem,
 382                                 int user_alloc);
 383 void kvm_arch_commit_memory_region(struct kvm *kvm,
 384                                 struct kvm_userspace_memory_region *mem,
 385                                 struct kvm_memory_slot old,
 386                                 int user_alloc);
 387 bool kvm_largepages_enabled(void);
 388 void kvm_disable_largepages(void);
 389 void kvm_arch_flush_shadow(struct kvm *kvm);
 390
 391 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
 392                             int nr_pages);
 393
 394 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 395 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
 396 void kvm_release_page_clean(struct page *page);
 397 void kvm_release_page_dirty(struct page *page);
 398 void kvm_set_page_dirty(struct page *page);
 399 void kvm_set_page_accessed(struct page *page);
 400
 401 pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr);
 402 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn);
 403 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
 404                        bool write_fault, bool *writable);
 405 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
 406 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
 407                       bool *writable);
 408 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
 409                          struct kvm_memory_slot *slot, gfn_t gfn);
 410 void kvm_release_pfn_dirty(pfn_t);
 411 void kvm_release_pfn_clean(pfn_t pfn);
 412 void kvm_set_pfn_dirty(pfn_t pfn);
 413 void kvm_set_pfn_accessed(pfn_t pfn);
 414 void kvm_get_pfn(pfn_t pfn);
 415
 416 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 417                         int len);
 418 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
 419                           unsigned long len);
 420 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
 421 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 422                            void *data, unsigned long len);
 423 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 424                          int offset, int len);
 425 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 426                     unsigned long len);
 427 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 428                            void *data, unsigned long len);
 429 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 430                               gpa_t gpa);
 431 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
 432 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
 433 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 434 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
 435 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
 436 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 437 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
 438                              gfn_t gfn);
 439
 440 void kvm_vcpu_block(struct kvm_vcpu *vcpu);
 441 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
 442 void kvm_resched(struct kvm_vcpu *vcpu);
 443 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 444 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 445
 446 void kvm_flush_remote_tlbs(struct kvm *kvm);
 447 void kvm_reload_remote_mmus(struct kvm *kvm);
 448
 449 long kvm_arch_dev_ioctl(struct file *filp,
 450                         unsigned int ioctl, unsigned long arg);
 451 long kvm_arch_vcpu_ioctl(struct file *filp,
 452                          unsigned int ioctl, unsigned long arg);
 453 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);
 454
 455 int kvm_dev_ioctl_check_extension(long ext);
 456
 457 int kvm_get_dirty_log(struct kvm *kvm,
 458                         struct kvm_dirty_log *log, int *is_dirty);
 459 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 460                                 struct kvm_dirty_log *log);
 461
 462 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 463                                    struct
 464                                    kvm_userspace_memory_region *mem,
 465                                    int user_alloc);
 466 long kvm_arch_vm_ioctl(struct file *filp,
 467                        unsigned int ioctl, unsigned long arg);
 468
 469 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 470 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 471
 472 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 473                                     struct kvm_translation *tr);
 474
 475 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 476 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 477 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 478                                   struct kvm_sregs *sregs);
 479 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 480                                   struct kvm_sregs *sregs);
 481 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 482                                     struct kvm_mp_state *mp_state);
 483 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 484                                     struct kvm_mp_state *mp_state);
 485 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 486                                         struct kvm_guest_debug *dbg);
 487 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
 488
 489 int kvm_arch_init(void *opaque);
 490 void kvm_arch_exit(void);
 491
 492 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
 493 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
 494
 495 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
 496 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 497 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 498 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
 499 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
 500 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
 501
 502 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);
 503 int kvm_arch_hardware_enable(void *garbage);
 504 void kvm_arch_hardware_disable(void *garbage);
 505 int kvm_arch_hardware_setup(void);
 506 void kvm_arch_hardware_unsetup(void);
 507 void kvm_arch_check_processor_compat(void *rtn);
 508 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
 509
 510 void kvm_free_physmem(struct kvm *kvm);
 511
 512 #ifndef __KVM_HAVE_ARCH_VM_ALLOC
 513 static inline struct kvm *kvm_arch_alloc_vm(void)
 514 {
 515         return kzalloc(sizeof(struct kvm), GFP_KERNEL);
 516 }
 517
 518 static inline void kvm_arch_free_vm(struct kvm *kvm)
 519 {
 520         kfree(kvm);
 521 }
 522 #endif
 523
 524 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
 525 void kvm_arch_destroy_vm(struct kvm *kvm);
 526 void kvm_free_all_assigned_devices(struct kvm *kvm);
 527 void kvm_arch_sync_events(struct kvm *kvm);
 528
 529 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
 530 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
 531
 532 int kvm_is_mmio_pfn(pfn_t pfn);
 533
 534 struct kvm_irq_ack_notifier {
 535         struct hlist_node link;
 536         unsigned gsi;
 537         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
 538 };
 539
 540 struct kvm_assigned_dev_kernel {
 541         struct kvm_irq_ack_notifier ack_notifier;
 542         struct list_head list;
 543         int assigned_dev_id;
 544         int host_segnr;
 545         int host_busnr;
 546         int host_devfn;
 547         unsigned int entries_nr;
 548         int host_irq;
 549         bool host_irq_disabled;
 550         bool pci_2_3;
 551         struct msix_entry *host_msix_entries;
 552         int guest_irq;
 553         struct msix_entry *guest_msix_entries;
 554         unsigned long irq_requested_type;
 555         int irq_source_id;
 556         int flags;
 557         struct pci_dev *dev;
 558         struct kvm *kvm;
 559         spinlock_t intx_lock;
 560         spinlock_t intx_mask_lock;
 561         char irq_name[32];
 562         struct pci_saved_state *pci_saved_state;
 563 };
 564
 565 struct kvm_irq_mask_notifier {
 566         void (*func)(struct kvm_irq_mask_notifier *kimn, bool masked);
 567         int irq;
 568         struct hlist_node link;
 569 };
 570
 571 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
 572                                     struct kvm_irq_mask_notifier *kimn);
 573 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 574                                       struct kvm_irq_mask_notifier *kimn);
 575 void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
 576                              bool mask);
 577
 578 #ifdef __KVM_HAVE_IOAPIC
 579 void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
 580                                    union kvm_ioapic_redirect_entry *entry,
 581                                    unsigned long *deliver_bitmask);
 582 #endif
 583 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level);
 584 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
 585                 int irq_source_id, int level);
 586 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
 587 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 588                                    struct kvm_irq_ack_notifier *kian);
 589 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
 590                                    struct kvm_irq_ack_notifier *kian);
 591 int kvm_request_irq_source_id(struct kvm *kvm);
 592 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
 593
 594 /* For vcpu->arch.iommu_flags */
 595 #define KVM_IOMMU_CACHE_COHERENCY       0x1
 596
 597 #ifdef CONFIG_IOMMU_API
 598 int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
 599 void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
 600 int kvm_iommu_map_guest(struct kvm *kvm);
 601 int kvm_iommu_unmap_guest(struct kvm *kvm);
 602 int kvm_assign_device(struct kvm *kvm,
 603                       struct kvm_assigned_dev_kernel *assigned_dev);
 604 int kvm_deassign_device(struct kvm *kvm,
 605                         struct kvm_assigned_dev_kernel *assigned_dev);
 606 #else /* CONFIG_IOMMU_API */
 607 static inline int kvm_iommu_map_pages(struct kvm *kvm,
 608                                       struct kvm_memory_slot *slot)
 609 {
 610         return 0;
 611 }
 612
 613 static inline void kvm_iommu_unmap_pages(struct kvm *kvm,
 614                                          struct kvm_memory_slot *slot)
 615 {
 616 }
 617
 618 static inline int kvm_iommu_map_guest(struct kvm *kvm)
 619 {
 620         return -ENODEV;
 621 }
 622
 623 static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
 624 {
 625         return 0;
 626 }
 627
 628 static inline int kvm_assign_device(struct kvm *kvm,
 629                 struct kvm_assigned_dev_kernel *assigned_dev)
 630 {
 631         return 0;
 632 }
 633
 634 static inline int kvm_deassign_device(struct kvm *kvm,
 635                 struct kvm_assigned_dev_kernel *assigned_dev)
 636 {
 637         return 0;
 638 }
 639 #endif /* CONFIG_IOMMU_API */
 640
 641 static inline void kvm_guest_enter(void)
 642 {
 643         BUG_ON(preemptible());
 644         account_system_vtime(current);
 645         current->flags |= PF_VCPU;
 646         /* KVM does not hold any references to rcu protected data when it
 647          * switches CPU into a guest mode. In fact switching to a guest mode
 648          * is very similar to exiting to userspase from rcu point of view. In
 649          * addition CPU may stay in a guest mode for quite a long time (up to
 650          * one time slice). Lets treat guest mode as quiescent state, just like
 651          * we do with user-mode execution.
 652          */
 653         rcu_virt_note_context_switch(smp_processor_id());
 654 }
 655
 656 static inline void kvm_guest_exit(void)
 657 {
 658         account_system_vtime(current);
 659         current->flags &= ~PF_VCPU;
 660 }
 661
 662 /*
 663  * search_memslots() and __gfn_to_memslot() are here because they are
 664  * used in non-modular code in arch/powerpc/kvm/book3s_hv_rm_mmu.c.
 665  * gfn_to_memslot() itself isn't here as an inline because that would
 666  * bloat other code too much.
 667  */
 668 static inline struct kvm_memory_slot *
 669 search_memslots(struct kvm_memslots *slots, gfn_t gfn)
 670 {
 671         struct kvm_memory_slot *memslot;
 672
 673         kvm_for_each_memslot(memslot, slots)
 674                 if (gfn >= memslot->base_gfn &&
 675                       gfn < memslot->base_gfn + memslot->npages)
 676                         return memslot;
 677
 678         return NULL;
 679 }
 680
 681 static inline struct kvm_memory_slot *
 682 __gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
 683 {
 684         return search_memslots(slots, gfn);
 685 }
 686
 687 static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
 688 {
 689         return gfn_to_memslot(kvm, gfn)->id;
 690 }
 691
 692 static inline gfn_t gfn_to_index(gfn_t gfn, gfn_t base_gfn, int level)
 693 {
 694         /* KVM_HPAGE_GFN_SHIFT(PT_PAGE_TABLE_LEVEL) must be 0. */
 695         return (gfn >> KVM_HPAGE_GFN_SHIFT(level)) -
 696                 (base_gfn >> KVM_HPAGE_GFN_SHIFT(level));
 697 }
 698
 699 static inline unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
 700                                                gfn_t gfn)
 701 {
 702         return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
 703 }
 704
 705 static inline gpa_t gfn_to_gpa(gfn_t gfn)
 706 {
 707         return (gpa_t)gfn << PAGE_SHIFT;
 708 }
 709
 710 static inline gfn_t gpa_to_gfn(gpa_t gpa)
 711 {
 712         return (gfn_t)(gpa >> PAGE_SHIFT);
 713 }
 714
 715 static inline hpa_t pfn_to_hpa(pfn_t pfn)
 716 {
 717         return (hpa_t)pfn << PAGE_SHIFT;
 718 }
 719
 720 static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
 721 {
 722         set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
 723 }
 724
 725 enum kvm_stat_kind {
 726         KVM_STAT_VM,
 727         KVM_STAT_VCPU,
 728 };
 729
 730 struct kvm_stats_debugfs_item {
 731         const char *name;
 732         int offset;
 733         enum kvm_stat_kind kind;
 734         struct dentry *dentry;
 735 };
 736 extern struct kvm_stats_debugfs_item debugfs_entries[];
 737 extern struct dentry *kvm_debugfs_dir;
 738
 739 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 740 static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_seq)
 741 {
 742         if (unlikely(vcpu->kvm->mmu_notifier_count))
 743                 return 1;
 744         /*
 745          * Ensure the read of mmu_notifier_count happens before the read
 746          * of mmu_notifier_seq.  This interacts with the smp_wmb() in
 747          * mmu_notifier_invalidate_range_end to make sure that the caller
 748          * either sees the old (non-zero) value of mmu_notifier_count or
 749          * the new (incremented) value of mmu_notifier_seq.
 750          * PowerPC Book3s HV KVM calls this under a per-page lock
 751          * rather than under kvm->mmu_lock, for scalability, so
 752          * can't rely on kvm->mmu_lock to keep things ordered.
 753          */
 754         smp_rmb();
 755         if (vcpu->kvm->mmu_notifier_seq != mmu_seq)
 756                 return 1;
 757         return 0;
 758 }
 759 #endif
 760
 761 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 762
 763 #define KVM_MAX_IRQ_ROUTES 1024
 764
 765 int kvm_setup_default_irq_routing(struct kvm *kvm);
 766 int kvm_set_irq_routing(struct kvm *kvm,
 767                         const struct kvm_irq_routing_entry *entries,
 768                         unsigned nr,
 769                         unsigned flags);
 770 void kvm_free_irq_routing(struct kvm *kvm);
 771
 772 #else
 773
 774 static inline void kvm_free_irq_routing(struct kvm *kvm) {}
 775
 776 #endif
 777
 778 #ifdef CONFIG_HAVE_KVM_EVENTFD
 779
 780 void kvm_eventfd_init(struct kvm *kvm);
 781 int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags);
 782 void kvm_irqfd_release(struct kvm *kvm);
 783 void kvm_irq_routing_update(struct kvm *, struct kvm_irq_routing_table *);
 784 int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
 785
 786 #else
 787
 788 static inline void kvm_eventfd_init(struct kvm *kvm) {}
 789
 790 static inline int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags)
 791 {
 792         return -EINVAL;
 793 }
 794
 795 static inline void kvm_irqfd_release(struct kvm *kvm) {}
 796
 797 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 798 static inline void kvm_irq_routing_update(struct kvm *kvm,
 799                                           struct kvm_irq_routing_table *irq_rt)
 800 {
 801         rcu_assign_pointer(kvm->irq_routing, irq_rt);
 802 }
 803 #endif
 804
 805 static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
 806 {
 807         return -ENOSYS;
 808 }
 809
 810 #endif /* CONFIG_HAVE_KVM_EVENTFD */
 811
 812 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
 813 static inline bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
 814 {
 815         return vcpu->kvm->bsp_vcpu_id == vcpu->vcpu_id;
 816 }
 817
 818 bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu);
 819
 820 #else
 821
 822 static inline bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) { return true; }
 823
 824 #endif
 825
 826 #ifdef __KVM_HAVE_DEVICE_ASSIGNMENT
 827
 828 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 829                                   unsigned long arg);
 830
 831 #else
 832
 833 static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 834                                                 unsigned long arg)
 835 {
 836         return -ENOTTY;
 837 }
 838
 839 #endif
 840
 841 static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
 842 {
 843         set_bit(req, &vcpu->requests);
 844 }
 845
 846 static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
 847 {
 848         if (test_bit(req, &vcpu->requests)) {
 849                 clear_bit(req, &vcpu->requests);
 850                 return true;
 851         } else {
 852                 return false;
 853         }
 854 }
 855
 856 #endif
 857