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  * If we support unaligned MMIO, at most one fragment will be split into two:
  39  */
  40 #ifdef KVM_UNALIGNED_MMIO
  41 #  define KVM_EXTRA_MMIO_FRAGMENTS 1
  42 #else
  43 #  define KVM_EXTRA_MMIO_FRAGMENTS 0
  44 #endif
  45
  46 #define KVM_USER_MMIO_SIZE 8
  47
  48 #define KVM_MAX_MMIO_FRAGMENTS \
  49         (KVM_MMIO_SIZE / KVM_USER_MMIO_SIZE + KVM_EXTRA_MMIO_FRAGMENTS)
  50
  51 /*
  52  * vcpu->requests bit members
  53  */
  54 #define KVM_REQ_TLB_FLUSH          0
  55 #define KVM_REQ_MIGRATE_TIMER      1
  56 #define KVM_REQ_REPORT_TPR_ACCESS  2
  57 #define KVM_REQ_MMU_RELOAD         3
  58 #define KVM_REQ_TRIPLE_FAULT       4
  59 #define KVM_REQ_PENDING_TIMER      5
  60 #define KVM_REQ_UNHALT             6
  61 #define KVM_REQ_MMU_SYNC           7
  62 #define KVM_REQ_CLOCK_UPDATE       8
  63 #define KVM_REQ_KICK               9
  64 #define KVM_REQ_DEACTIVATE_FPU    10
  65 #define KVM_REQ_EVENT             11
  66 #define KVM_REQ_APF_HALT          12
  67 #define KVM_REQ_STEAL_UPDATE      13
  68 #define KVM_REQ_NMI               14
  69 #define KVM_REQ_IMMEDIATE_EXIT    15
  70 #define KVM_REQ_PMU               16
  71 #define KVM_REQ_PMI               17
  72
  73 #define KVM_USERSPACE_IRQ_SOURCE_ID     0
  74
  75 struct kvm;
  76 struct kvm_vcpu;
  77 extern struct kmem_cache *kvm_vcpu_cache;
  78
  79 struct kvm_io_range {
  80         gpa_t addr;
  81         int len;
  82         struct kvm_io_device *dev;
  83 };
  84
  85 #define NR_IOBUS_DEVS 1000
  86
  87 struct kvm_io_bus {
  88         int                   dev_count;
  89         struct kvm_io_range range[];
  90 };
  91
  92 enum kvm_bus {
  93         KVM_MMIO_BUS,
  94         KVM_PIO_BUS,
  95         KVM_NR_BUSES
  96 };
  97
  98 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
  99                      int len, const void *val);
 100 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len,
 101                     void *val);
 102 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
 103                             int len, struct kvm_io_device *dev);
 104 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
 105                               struct kvm_io_device *dev);
 106
 107 #ifdef CONFIG_KVM_ASYNC_PF
 108 struct kvm_async_pf {
 109         struct work_struct work;
 110         struct list_head link;
 111         struct list_head queue;
 112         struct kvm_vcpu *vcpu;
 113         struct mm_struct *mm;
 114         gva_t gva;
 115         unsigned long addr;
 116         struct kvm_arch_async_pf arch;
 117         struct page *page;
 118         bool done;
 119 };
 120
 121 void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);
 122 void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu);
 123 int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
 124                        struct kvm_arch_async_pf *arch);
 125 int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
 126 #endif
 127
 128 enum {
 129         OUTSIDE_GUEST_MODE,
 130         IN_GUEST_MODE,
 131         EXITING_GUEST_MODE,
 132         READING_SHADOW_PAGE_TABLES,
 133 };
 134
 135 /*
 136  * Sometimes a large or cross-page mmio needs to be broken up into separate
 137  * exits for userspace servicing.
 138  */
 139 struct kvm_mmio_fragment {
 140         gpa_t gpa;
 141         void *data;
 142         unsigned len;
 143 };
 144
 145 struct kvm_vcpu {
 146         struct kvm *kvm;
 147 #ifdef CONFIG_PREEMPT_NOTIFIERS
 148         struct preempt_notifier preempt_notifier;
 149 #endif
 150         int cpu;
 151         int vcpu_id;
 152         int srcu_idx;
 153         int mode;
 154         unsigned long requests;
 155         unsigned long guest_debug;
 156
 157         struct mutex mutex;
 158         struct kvm_run *run;
 159
 160         int fpu_active;
 161         int guest_fpu_loaded, guest_xcr0_loaded;
 162         wait_queue_head_t wq;
 163         struct pid *pid;
 164         int sigset_active;
 165         sigset_t sigset;
 166         struct kvm_vcpu_stat stat;
 167
 168 #ifdef CONFIG_HAS_IOMEM
 169         int mmio_needed;
 170         int mmio_read_completed;
 171         int mmio_is_write;
 172         int mmio_cur_fragment;
 173         int mmio_nr_fragments;
 174         struct kvm_mmio_fragment mmio_fragments[KVM_MAX_MMIO_FRAGMENTS];
 175 #endif
 176
 177 #ifdef CONFIG_KVM_ASYNC_PF
 178         struct {
 179                 u32 queued;
 180                 struct list_head queue;
 181                 struct list_head done;
 182                 spinlock_t lock;
 183         } async_pf;
 184 #endif
 185
 186         struct kvm_vcpu_arch arch;
 187 };
 188
 189 static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
 190 {
 191         return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
 192 }
 193
 194 /*
 195  * Some of the bitops functions do not support too long bitmaps.
 196  * This number must be determined not to exceed such limits.
 197  */
 198 #define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
 199
 200 struct kvm_memory_slot {
 201         gfn_t base_gfn;
 202         unsigned long npages;
 203         unsigned long flags;
 204         unsigned long *rmap;
 205         unsigned long *dirty_bitmap;
 206         struct kvm_arch_memory_slot arch;
 207         unsigned long userspace_addr;
 208         int user_alloc;
 209         int id;
 210 };
 211
 212 static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
 213 {
 214         return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 215 }
 216
 217 struct kvm_kernel_irq_routing_entry {
 218         u32 gsi;
 219         u32 type;
 220         int (*set)(struct kvm_kernel_irq_routing_entry *e,
 221                    struct kvm *kvm, int irq_source_id, int level);
 222         union {
 223                 struct {
 224                         unsigned irqchip;
 225                         unsigned pin;
 226                 } irqchip;
 227                 struct msi_msg msi;
 228         };
 229         struct hlist_node link;
 230 };
 231
 232 #ifdef __KVM_HAVE_IOAPIC
 233
 234 struct kvm_irq_routing_table {
 235         int chip[KVM_NR_IRQCHIPS][KVM_IOAPIC_NUM_PINS];
 236         struct kvm_kernel_irq_routing_entry *rt_entries;
 237         u32 nr_rt_entries;
 238         /*
 239          * Array indexed by gsi. Each entry contains list of irq chips
 240          * the gsi is connected to.
 241          */
 242         struct hlist_head map[0];
 243 };
 244
 245 #else
 246
 247 struct kvm_irq_routing_table {};
 248
 249 #endif
 250
 251 #ifndef KVM_MEM_SLOTS_NUM
 252 #define KVM_MEM_SLOTS_NUM (KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 253 #endif
 254
 255 /*
 256  * Note:
 257  * memslots are not sorted by id anymore, please use id_to_memslot()
 258  * to get the memslot by its id.
 259  */
 260 struct kvm_memslots {
 261         u64 generation;
 262         struct kvm_memory_slot memslots[KVM_MEM_SLOTS_NUM];
 263         /* The mapping table from slot id to the index in memslots[]. */
 264         int id_to_index[KVM_MEM_SLOTS_NUM];
 265 };
 266
 267 struct kvm {
 268         spinlock_t mmu_lock;
 269         struct mutex slots_lock;
 270         struct mm_struct *mm; /* userspace tied to this vm */
 271         struct kvm_memslots *memslots;
 272         struct srcu_struct srcu;
 273 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
 274         u32 bsp_vcpu_id;
 275 #endif
 276         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 277         atomic_t online_vcpus;
 278         int last_boosted_vcpu;
 279         struct list_head vm_list;
 280         struct mutex lock;
 281         struct kvm_io_bus *buses[KVM_NR_BUSES];
 282 #ifdef CONFIG_HAVE_KVM_EVENTFD
 283         struct {
 284                 spinlock_t        lock;
 285                 struct list_head  items;
 286         } irqfds;
 287         struct list_head ioeventfds;
 288 #endif
 289         struct kvm_vm_stat stat;
 290         struct kvm_arch arch;
 291         atomic_t users_count;
 292 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 293         struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
 294         spinlock_t ring_lock;
 295         struct list_head coalesced_zones;
 296 #endif
 297
 298         struct mutex irq_lock;
 299 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 300         /*
 301          * Update side is protected by irq_lock and,
 302          * if configured, irqfds.lock.
 303          */
 304         struct kvm_irq_routing_table __rcu *irq_routing;
 305         struct hlist_head mask_notifier_list;
 306         struct hlist_head irq_ack_notifier_list;
 307 #endif
 308
 309 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 310         struct mmu_notifier mmu_notifier;
 311         unsigned long mmu_notifier_seq;
 312         long mmu_notifier_count;
 313 #endif
 314         long tlbs_dirty;
 315 };
 316
 317 /* The guest did something we don't support. */
 318 #define pr_unimpl(vcpu, fmt, ...)                                       \
 319         pr_err_ratelimited("kvm: %i: cpu%i " fmt,                       \
 320                            current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__)
 321
 322 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 323 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 324
 325 static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
 326 {
 327         smp_rmb();
 328         return kvm->vcpus[i];
 329 }
 330
 331 #define kvm_for_each_vcpu(idx, vcpup, kvm) \
 332         for (idx = 0; \
 333              idx < atomic_read(&kvm->online_vcpus) && \
 334              (vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
 335              idx++)
 336
 337 #define kvm_for_each_memslot(memslot, slots)    \
 338         for (memslot = &slots->memslots[0];     \
 339               memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\
 340                 memslot++)
 341
 342 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 343 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 344
 345 void vcpu_load(struct kvm_vcpu *vcpu);
 346 void vcpu_put(struct kvm_vcpu *vcpu);
 347
 348 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
 349                   struct module *module);
 350 void kvm_exit(void);
 351
 352 void kvm_get_kvm(struct kvm *kvm);
 353 void kvm_put_kvm(struct kvm *kvm);
 354 void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new);
 355
 356 static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
 357 {
 358         return rcu_dereference_check(kvm->memslots,
 359                         srcu_read_lock_held(&kvm->srcu)
 360                         || lockdep_is_held(&kvm->slots_lock));
 361 }
 362
 363 static inline struct kvm_memory_slot *
 364 id_to_memslot(struct kvm_memslots *slots, int id)
 365 {
 366         int index = slots->id_to_index[id];
 367         struct kvm_memory_slot *slot;
 368
 369         slot = &slots->memslots[index];
 370
 371         WARN_ON(slot->id != id);
 372         return slot;
 373 }
 374
 375 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 376 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 377 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 378
 379 extern struct page *bad_page;
 380 extern struct page *fault_page;
 381
 382 extern pfn_t bad_pfn;
 383 extern pfn_t fault_pfn;
 384
 385 int is_error_page(struct page *page);
 386 int is_error_pfn(pfn_t pfn);
 387 int is_hwpoison_pfn(pfn_t pfn);
 388 int is_fault_pfn(pfn_t pfn);
 389 int is_noslot_pfn(pfn_t pfn);
 390 int is_invalid_pfn(pfn_t pfn);
 391 int kvm_is_error_hva(unsigned long addr);
 392 int kvm_set_memory_region(struct kvm *kvm,
 393                           struct kvm_userspace_memory_region *mem,
 394                           int user_alloc);
 395 int __kvm_set_memory_region(struct kvm *kvm,
 396                             struct kvm_userspace_memory_region *mem,
 397                             int user_alloc);
 398 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
 399                            struct kvm_memory_slot *dont);
 400 int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages);
 401 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 402                                 struct kvm_memory_slot *memslot,
 403                                 struct kvm_memory_slot old,
 404                                 struct kvm_userspace_memory_region *mem,
 405                                 int user_alloc);
 406 void kvm_arch_commit_memory_region(struct kvm *kvm,
 407                                 struct kvm_userspace_memory_region *mem,
 408                                 struct kvm_memory_slot old,
 409                                 int user_alloc);
 410 bool kvm_largepages_enabled(void);
 411 void kvm_disable_largepages(void);
 412 void kvm_arch_flush_shadow(struct kvm *kvm);
 413
 414 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
 415                             int nr_pages);
 416
 417 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 418 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
 419 void kvm_release_page_clean(struct page *page);
 420 void kvm_release_page_dirty(struct page *page);
 421 void kvm_set_page_dirty(struct page *page);
 422 void kvm_set_page_accessed(struct page *page);
 423
 424 pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr);
 425 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn);
 426 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
 427                        bool write_fault, bool *writable);
 428 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
 429 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
 430                       bool *writable);
 431 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
 432                          struct kvm_memory_slot *slot, gfn_t gfn);
 433 void kvm_release_pfn_dirty(pfn_t);
 434 void kvm_release_pfn_clean(pfn_t pfn);
 435 void kvm_set_pfn_dirty(pfn_t pfn);
 436 void kvm_set_pfn_accessed(pfn_t pfn);
 437 void kvm_get_pfn(pfn_t pfn);
 438
 439 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 440                         int len);
 441 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
 442                           unsigned long len);
 443 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
 444 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 445                            void *data, unsigned long len);
 446 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 447                          int offset, int len);
 448 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 449                     unsigned long len);
 450 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 451                            void *data, unsigned long len);
 452 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 453                               gpa_t gpa);
 454 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
 455 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
 456 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 457 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
 458 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
 459 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 460 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
 461                              gfn_t gfn);
 462
 463 void kvm_vcpu_block(struct kvm_vcpu *vcpu);
 464 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
 465 bool kvm_vcpu_yield_to(struct kvm_vcpu *target);
 466 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
 467 void kvm_resched(struct kvm_vcpu *vcpu);
 468 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 469 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 470
 471 void kvm_flush_remote_tlbs(struct kvm *kvm);
 472 void kvm_reload_remote_mmus(struct kvm *kvm);
 473
 474 long kvm_arch_dev_ioctl(struct file *filp,
 475                         unsigned int ioctl, unsigned long arg);
 476 long kvm_arch_vcpu_ioctl(struct file *filp,
 477                          unsigned int ioctl, unsigned long arg);
 478 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);
 479
 480 int kvm_dev_ioctl_check_extension(long ext);
 481
 482 int kvm_get_dirty_log(struct kvm *kvm,
 483                         struct kvm_dirty_log *log, int *is_dirty);
 484 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 485                                 struct kvm_dirty_log *log);
 486
 487 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 488                                    struct
 489                                    kvm_userspace_memory_region *mem,
 490                                    int user_alloc);
 491 long kvm_arch_vm_ioctl(struct file *filp,
 492                        unsigned int ioctl, unsigned long arg);
 493
 494 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 495 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 496
 497 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 498                                     struct kvm_translation *tr);
 499
 500 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 501 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 502 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 503                                   struct kvm_sregs *sregs);
 504 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 505                                   struct kvm_sregs *sregs);
 506 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 507                                     struct kvm_mp_state *mp_state);
 508 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 509                                     struct kvm_mp_state *mp_state);
 510 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 511                                         struct kvm_guest_debug *dbg);
 512 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
 513
 514 int kvm_arch_init(void *opaque);
 515 void kvm_arch_exit(void);
 516
 517 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
 518 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
 519
 520 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
 521 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 522 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 523 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
 524 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
 525 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
 526
 527 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);
 528 int kvm_arch_hardware_enable(void *garbage);
 529 void kvm_arch_hardware_disable(void *garbage);
 530 int kvm_arch_hardware_setup(void);
 531 void kvm_arch_hardware_unsetup(void);
 532 void kvm_arch_check_processor_compat(void *rtn);
 533 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
 534 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
 535
 536 void kvm_free_physmem(struct kvm *kvm);
 537
 538 void *kvm_kvzalloc(unsigned long size);
 539 void kvm_kvfree(const void *addr);
 540
 541 #ifndef __KVM_HAVE_ARCH_VM_ALLOC
 542 static inline struct kvm *kvm_arch_alloc_vm(void)
 543 {
 544         return kzalloc(sizeof(struct kvm), GFP_KERNEL);
 545 }
 546
 547 static inline void kvm_arch_free_vm(struct kvm *kvm)
 548 {
 549         kfree(kvm);
 550 }
 551 #endif
 552
 553 static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
 554 {
 555 #ifdef __KVM_HAVE_ARCH_WQP
 556         return vcpu->arch.wqp;
 557 #else
 558         return &vcpu->wq;
 559 #endif
 560 }
 561
 562 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
 563 void kvm_arch_destroy_vm(struct kvm *kvm);
 564 void kvm_free_all_assigned_devices(struct kvm *kvm);
 565 void kvm_arch_sync_events(struct kvm *kvm);
 566
 567 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
 568 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
 569
 570 int kvm_is_mmio_pfn(pfn_t pfn);
 571
 572 struct kvm_irq_ack_notifier {
 573         struct hlist_node link;
 574         unsigned gsi;
 575         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
 576 };
 577
 578 struct kvm_assigned_dev_kernel {
 579         struct kvm_irq_ack_notifier ack_notifier;
 580         struct list_head list;
 581         int assigned_dev_id;
 582         int host_segnr;
 583         int host_busnr;
 584         int host_devfn;
 585         unsigned int entries_nr;
 586         int host_irq;
 587         bool host_irq_disabled;
 588         bool pci_2_3;
 589         struct msix_entry *host_msix_entries;
 590         int guest_irq;
 591         struct msix_entry *guest_msix_entries;
 592         unsigned long irq_requested_type;
 593         int irq_source_id;
 594         int flags;
 595         struct pci_dev *dev;
 596         struct kvm *kvm;
 597         spinlock_t intx_lock;
 598         spinlock_t intx_mask_lock;
 599         char irq_name[32];
 600         struct pci_saved_state *pci_saved_state;
 601 };
 602
 603 struct kvm_irq_mask_notifier {
 604         void (*func)(struct kvm_irq_mask_notifier *kimn, bool masked);
 605         int irq;
 606         struct hlist_node link;
 607 };
 608
 609 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
 610                                     struct kvm_irq_mask_notifier *kimn);
 611 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 612                                       struct kvm_irq_mask_notifier *kimn);
 613 void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
 614                              bool mask);
 615
 616 #ifdef __KVM_HAVE_IOAPIC
 617 void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
 618                                    union kvm_ioapic_redirect_entry *entry,
 619                                    unsigned long *deliver_bitmask);
 620 #endif
 621 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level);
 622 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
 623                 int irq_source_id, int level);
 624 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
 625 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 626                                    struct kvm_irq_ack_notifier *kian);
 627 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
 628                                    struct kvm_irq_ack_notifier *kian);
 629 int kvm_request_irq_source_id(struct kvm *kvm);
 630 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
 631
 632 /* For vcpu->arch.iommu_flags */
 633 #define KVM_IOMMU_CACHE_COHERENCY       0x1
 634
 635 #ifdef CONFIG_IOMMU_API
 636 int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
 637 void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
 638 int kvm_iommu_map_guest(struct kvm *kvm);
 639 int kvm_iommu_unmap_guest(struct kvm *kvm);
 640 int kvm_assign_device(struct kvm *kvm,
 641                       struct kvm_assigned_dev_kernel *assigned_dev);
 642 int kvm_deassign_device(struct kvm *kvm,
 643                         struct kvm_assigned_dev_kernel *assigned_dev);
 644 #else /* CONFIG_IOMMU_API */
 645 static inline int kvm_iommu_map_pages(struct kvm *kvm,
 646                                       struct kvm_memory_slot *slot)
 647 {
 648         return 0;
 649 }
 650
 651 static inline void kvm_iommu_unmap_pages(struct kvm *kvm,
 652                                          struct kvm_memory_slot *slot)
 653 {
 654 }
 655
 656 static inline int kvm_iommu_map_guest(struct kvm *kvm)
 657 {
 658         return -ENODEV;
 659 }
 660
 661 static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
 662 {
 663         return 0;
 664 }
 665
 666 static inline int kvm_assign_device(struct kvm *kvm,
 667                 struct kvm_assigned_dev_kernel *assigned_dev)
 668 {
 669         return 0;
 670 }
 671
 672 static inline int kvm_deassign_device(struct kvm *kvm,
 673                 struct kvm_assigned_dev_kernel *assigned_dev)
 674 {
 675         return 0;
 676 }
 677 #endif /* CONFIG_IOMMU_API */
 678
 679 static inline void kvm_guest_enter(void)
 680 {
 681         BUG_ON(preemptible());
 682         account_system_vtime(current);
 683         current->flags |= PF_VCPU;
 684         /* KVM does not hold any references to rcu protected data when it
 685          * switches CPU into a guest mode. In fact switching to a guest mode
 686          * is very similar to exiting to userspase from rcu point of view. In
 687          * addition CPU may stay in a guest mode for quite a long time (up to
 688          * one time slice). Lets treat guest mode as quiescent state, just like
 689          * we do with user-mode execution.
 690          */
 691         rcu_virt_note_context_switch(smp_processor_id());
 692 }
 693
 694 static inline void kvm_guest_exit(void)
 695 {
 696         account_system_vtime(current);
 697         current->flags &= ~PF_VCPU;
 698 }
 699
 700 /*
 701  * search_memslots() and __gfn_to_memslot() are here because they are
 702  * used in non-modular code in arch/powerpc/kvm/book3s_hv_rm_mmu.c.
 703  * gfn_to_memslot() itself isn't here as an inline because that would
 704  * bloat other code too much.
 705  */
 706 static inline struct kvm_memory_slot *
 707 search_memslots(struct kvm_memslots *slots, gfn_t gfn)
 708 {
 709         struct kvm_memory_slot *memslot;
 710
 711         kvm_for_each_memslot(memslot, slots)
 712                 if (gfn >= memslot->base_gfn &&
 713                       gfn < memslot->base_gfn + memslot->npages)
 714                         return memslot;
 715
 716         return NULL;
 717 }
 718
 719 static inline struct kvm_memory_slot *
 720 __gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
 721 {
 722         return search_memslots(slots, gfn);
 723 }
 724
 725 static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
 726 {
 727         return gfn_to_memslot(kvm, gfn)->id;
 728 }
 729
 730 static inline gfn_t gfn_to_index(gfn_t gfn, gfn_t base_gfn, int level)
 731 {
 732         /* KVM_HPAGE_GFN_SHIFT(PT_PAGE_TABLE_LEVEL) must be 0. */
 733         return (gfn >> KVM_HPAGE_GFN_SHIFT(level)) -
 734                 (base_gfn >> KVM_HPAGE_GFN_SHIFT(level));
 735 }
 736
 737 static inline unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
 738                                                gfn_t gfn)
 739 {
 740         return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
 741 }
 742
 743 static inline gpa_t gfn_to_gpa(gfn_t gfn)
 744 {
 745         return (gpa_t)gfn << PAGE_SHIFT;
 746 }
 747
 748 static inline gfn_t gpa_to_gfn(gpa_t gpa)
 749 {
 750         return (gfn_t)(gpa >> PAGE_SHIFT);
 751 }
 752
 753 static inline hpa_t pfn_to_hpa(pfn_t pfn)
 754 {
 755         return (hpa_t)pfn << PAGE_SHIFT;
 756 }
 757
 758 static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
 759 {
 760         set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
 761 }
 762
 763 enum kvm_stat_kind {
 764         KVM_STAT_VM,
 765         KVM_STAT_VCPU,
 766 };
 767
 768 struct kvm_stats_debugfs_item {
 769         const char *name;
 770         int offset;
 771         enum kvm_stat_kind kind;
 772         struct dentry *dentry;
 773 };
 774 extern struct kvm_stats_debugfs_item debugfs_entries[];
 775 extern struct dentry *kvm_debugfs_dir;
 776
 777 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 778 static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_seq)
 779 {
 780         if (unlikely(vcpu->kvm->mmu_notifier_count))
 781                 return 1;
 782         /*
 783          * Ensure the read of mmu_notifier_count happens before the read
 784          * of mmu_notifier_seq.  This interacts with the smp_wmb() in
 785          * mmu_notifier_invalidate_range_end to make sure that the caller
 786          * either sees the old (non-zero) value of mmu_notifier_count or
 787          * the new (incremented) value of mmu_notifier_seq.
 788          * PowerPC Book3s HV KVM calls this under a per-page lock
 789          * rather than under kvm->mmu_lock, for scalability, so
 790          * can't rely on kvm->mmu_lock to keep things ordered.
 791          */
 792         smp_rmb();
 793         if (vcpu->kvm->mmu_notifier_seq != mmu_seq)
 794                 return 1;
 795         return 0;
 796 }
 797 #endif
 798
 799 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 800
 801 #define KVM_MAX_IRQ_ROUTES 1024
 802
 803 int kvm_setup_default_irq_routing(struct kvm *kvm);
 804 int kvm_set_irq_routing(struct kvm *kvm,
 805                         const struct kvm_irq_routing_entry *entries,
 806                         unsigned nr,
 807                         unsigned flags);
 808 void kvm_free_irq_routing(struct kvm *kvm);
 809
 810 int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
 811
 812 #else
 813
 814 static inline void kvm_free_irq_routing(struct kvm *kvm) {}
 815
 816 #endif
 817
 818 #ifdef CONFIG_HAVE_KVM_EVENTFD
 819
 820 void kvm_eventfd_init(struct kvm *kvm);
 821 int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags);
 822 void kvm_irqfd_release(struct kvm *kvm);
 823 void kvm_irq_routing_update(struct kvm *, struct kvm_irq_routing_table *);
 824 int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
 825
 826 #else
 827
 828 static inline void kvm_eventfd_init(struct kvm *kvm) {}
 829
 830 static inline int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags)
 831 {
 832         return -EINVAL;
 833 }
 834
 835 static inline void kvm_irqfd_release(struct kvm *kvm) {}
 836
 837 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 838 static inline void kvm_irq_routing_update(struct kvm *kvm,
 839                                           struct kvm_irq_routing_table *irq_rt)
 840 {
 841         rcu_assign_pointer(kvm->irq_routing, irq_rt);
 842 }
 843 #endif
 844
 845 static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
 846 {
 847         return -ENOSYS;
 848 }
 849
 850 #endif /* CONFIG_HAVE_KVM_EVENTFD */
 851
 852 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
 853 static inline bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
 854 {
 855         return vcpu->kvm->bsp_vcpu_id == vcpu->vcpu_id;
 856 }
 857
 858 bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu);
 859
 860 #else
 861
 862 static inline bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) { return true; }
 863
 864 #endif
 865
 866 #ifdef __KVM_HAVE_DEVICE_ASSIGNMENT
 867
 868 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 869                                   unsigned long arg);
 870
 871 #else
 872
 873 static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 874                                                 unsigned long arg)
 875 {
 876         return -ENOTTY;
 877 }
 878
 879 #endif
 880
 881 static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
 882 {
 883         set_bit(req, &vcpu->requests);
 884 }
 885
 886 static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
 887 {
 888         if (test_bit(req, &vcpu->requests)) {
 889                 clear_bit(req, &vcpu->requests);
 890                 return true;
 891         } else {
 892                 return false;
 893         }
 894 }
 895
 896 #endif
 897