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 <linux/err.h>
  25 #include <linux/irqflags.h>
  26 #include <linux/context_tracking.h>
  27 #include <asm/signal.h>
  28
  29 #include <linux/kvm.h>
  30 #include <linux/kvm_para.h>
  31
  32 #include <linux/kvm_types.h>
  33
  34 #include <asm/kvm_host.h>
  35
  36 #ifndef KVM_MMIO_SIZE
  37 #define KVM_MMIO_SIZE 8
  38 #endif
  39
  40 /*
  41  * The bit 16 ~ bit 31 of kvm_memory_region::flags are internally used
  42  * in kvm, other bits are visible for userspace which are defined in
  43  * include/linux/kvm_h.
  44  */
  45 #define KVM_MEMSLOT_INVALID     (1UL << 16)
  46
  47 /* Two fragments for cross MMIO pages. */
  48 #define KVM_MAX_MMIO_FRAGMENTS  2
  49
  50 /*
  51  * For the normal pfn, the highest 12 bits should be zero,
  52  * so we can mask bit 62 ~ bit 52  to indicate the error pfn,
  53  * mask bit 63 to indicate the noslot pfn.
  54  */
  55 #define KVM_PFN_ERR_MASK        (0x7ffULL << 52)
  56 #define KVM_PFN_ERR_NOSLOT_MASK (0xfffULL << 52)
  57 #define KVM_PFN_NOSLOT          (0x1ULL << 63)
  58
  59 #define KVM_PFN_ERR_FAULT       (KVM_PFN_ERR_MASK)
  60 #define KVM_PFN_ERR_HWPOISON    (KVM_PFN_ERR_MASK + 1)
  61 #define KVM_PFN_ERR_RO_FAULT    (KVM_PFN_ERR_MASK + 2)
  62
  63 /*
  64  * error pfns indicate that the gfn is in slot but faild to
  65  * translate it to pfn on host.
  66  */
  67 static inline bool is_error_pfn(pfn_t pfn)
  68 {
  69         return !!(pfn & KVM_PFN_ERR_MASK);
  70 }
  71
  72 /*
  73  * error_noslot pfns indicate that the gfn can not be
  74  * translated to pfn - it is not in slot or failed to
  75  * translate it to pfn.
  76  */
  77 static inline bool is_error_noslot_pfn(pfn_t pfn)
  78 {
  79         return !!(pfn & KVM_PFN_ERR_NOSLOT_MASK);
  80 }
  81
  82 /* noslot pfn indicates that the gfn is not in slot. */
  83 static inline bool is_noslot_pfn(pfn_t pfn)
  84 {
  85         return pfn == KVM_PFN_NOSLOT;
  86 }
  87
  88 /*
  89  * architectures with KVM_HVA_ERR_BAD other than PAGE_OFFSET (e.g. s390)
  90  * provide own defines and kvm_is_error_hva
  91  */
  92 #ifndef KVM_HVA_ERR_BAD
  93
  94 #define KVM_HVA_ERR_BAD         (PAGE_OFFSET)
  95 #define KVM_HVA_ERR_RO_BAD      (PAGE_OFFSET + PAGE_SIZE)
  96
  97 static inline bool kvm_is_error_hva(unsigned long addr)
  98 {
  99         return addr >= PAGE_OFFSET;
 100 }
 101
 102 #endif
 103
 104 #define KVM_ERR_PTR_BAD_PAGE    (ERR_PTR(-ENOENT))
 105
 106 static inline bool is_error_page(struct page *page)
 107 {
 108         return IS_ERR(page);
 109 }
 110
 111 /*
 112  * vcpu->requests bit members
 113  */
 114 #define KVM_REQ_TLB_FLUSH          0
 115 #define KVM_REQ_MIGRATE_TIMER      1
 116 #define KVM_REQ_REPORT_TPR_ACCESS  2
 117 #define KVM_REQ_MMU_RELOAD         3
 118 #define KVM_REQ_TRIPLE_FAULT       4
 119 #define KVM_REQ_PENDING_TIMER      5
 120 #define KVM_REQ_UNHALT             6
 121 #define KVM_REQ_MMU_SYNC           7
 122 #define KVM_REQ_CLOCK_UPDATE       8
 123 #define KVM_REQ_KICK               9
 124 #define KVM_REQ_DEACTIVATE_FPU    10
 125 #define KVM_REQ_EVENT             11
 126 #define KVM_REQ_APF_HALT          12
 127 #define KVM_REQ_STEAL_UPDATE      13
 128 #define KVM_REQ_NMI               14
 129 #define KVM_REQ_PMU               15
 130 #define KVM_REQ_PMI               16
 131 #define KVM_REQ_WATCHDOG          17
 132 #define KVM_REQ_MASTERCLOCK_UPDATE 18
 133 #define KVM_REQ_MCLOCK_INPROGRESS 19
 134 #define KVM_REQ_EPR_EXIT          20
 135 #define KVM_REQ_SCAN_IOAPIC       21
 136 #define KVM_REQ_GLOBAL_CLOCK_UPDATE 22
 137
 138 #define KVM_USERSPACE_IRQ_SOURCE_ID             0
 139 #define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID        1
 140
 141 struct kvm;
 142 struct kvm_vcpu;
 143 extern struct kmem_cache *kvm_vcpu_cache;
 144
 145 extern spinlock_t kvm_lock;
 146 extern struct list_head vm_list;
 147
 148 struct kvm_io_range {
 149         gpa_t addr;
 150         int len;
 151         struct kvm_io_device *dev;
 152 };
 153
 154 #define NR_IOBUS_DEVS 1000
 155
 156 struct kvm_io_bus {
 157         int dev_count;
 158         int ioeventfd_count;
 159         struct kvm_io_range range[];
 160 };
 161
 162 enum kvm_bus {
 163         KVM_MMIO_BUS,
 164         KVM_PIO_BUS,
 165         KVM_VIRTIO_CCW_NOTIFY_BUS,
 166         KVM_NR_BUSES
 167 };
 168
 169 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
 170                      int len, const void *val);
 171 int kvm_io_bus_write_cookie(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
 172                             int len, const void *val, long cookie);
 173 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len,
 174                     void *val);
 175 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
 176                             int len, struct kvm_io_device *dev);
 177 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
 178                               struct kvm_io_device *dev);
 179
 180 #ifdef CONFIG_KVM_ASYNC_PF
 181 struct kvm_async_pf {
 182         struct work_struct work;
 183         struct list_head link;
 184         struct list_head queue;
 185         struct kvm_vcpu *vcpu;
 186         struct mm_struct *mm;
 187         gva_t gva;
 188         unsigned long addr;
 189         struct kvm_arch_async_pf arch;
 190         bool   wakeup_all;
 191 };
 192
 193 void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);
 194 void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu);
 195 int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, unsigned long hva,
 196                        struct kvm_arch_async_pf *arch);
 197 int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
 198 #endif
 199
 200 enum {
 201         OUTSIDE_GUEST_MODE,
 202         IN_GUEST_MODE,
 203         EXITING_GUEST_MODE,
 204         READING_SHADOW_PAGE_TABLES,
 205 };
 206
 207 /*
 208  * Sometimes a large or cross-page mmio needs to be broken up into separate
 209  * exits for userspace servicing.
 210  */
 211 struct kvm_mmio_fragment {
 212         gpa_t gpa;
 213         void *data;
 214         unsigned len;
 215 };
 216
 217 struct kvm_vcpu {
 218         struct kvm *kvm;
 219 #ifdef CONFIG_PREEMPT_NOTIFIERS
 220         struct preempt_notifier preempt_notifier;
 221 #endif
 222         int cpu;
 223         int vcpu_id;
 224         int srcu_idx;
 225         int mode;
 226         unsigned long requests;
 227         unsigned long guest_debug;
 228
 229         struct mutex mutex;
 230         struct kvm_run *run;
 231
 232         int fpu_active;
 233         int guest_fpu_loaded, guest_xcr0_loaded;
 234         wait_queue_head_t wq;
 235         struct pid *pid;
 236         int sigset_active;
 237         sigset_t sigset;
 238         struct kvm_vcpu_stat stat;
 239
 240 #ifdef CONFIG_HAS_IOMEM
 241         int mmio_needed;
 242         int mmio_read_completed;
 243         int mmio_is_write;
 244         int mmio_cur_fragment;
 245         int mmio_nr_fragments;
 246         struct kvm_mmio_fragment mmio_fragments[KVM_MAX_MMIO_FRAGMENTS];
 247 #endif
 248
 249 #ifdef CONFIG_KVM_ASYNC_PF
 250         struct {
 251                 u32 queued;
 252                 struct list_head queue;
 253                 struct list_head done;
 254                 spinlock_t lock;
 255         } async_pf;
 256 #endif
 257
 258 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
 259         /*
 260          * Cpu relax intercept or pause loop exit optimization
 261          * in_spin_loop: set when a vcpu does a pause loop exit
 262          *  or cpu relax intercepted.
 263          * dy_eligible: indicates whether vcpu is eligible for directed yield.
 264          */
 265         struct {
 266                 bool in_spin_loop;
 267                 bool dy_eligible;
 268         } spin_loop;
 269 #endif
 270         bool preempted;
 271         struct kvm_vcpu_arch arch;
 272 };
 273
 274 static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
 275 {
 276         return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
 277 }
 278
 279 /*
 280  * Some of the bitops functions do not support too long bitmaps.
 281  * This number must be determined not to exceed such limits.
 282  */
 283 #define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
 284
 285 struct kvm_memory_slot {
 286         gfn_t base_gfn;
 287         unsigned long npages;
 288         unsigned long *dirty_bitmap;
 289         struct kvm_arch_memory_slot arch;
 290         unsigned long userspace_addr;
 291         u32 flags;
 292         short id;
 293 };
 294
 295 static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
 296 {
 297         return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 298 }
 299
 300 struct kvm_s390_adapter_int {
 301         u64 ind_addr;
 302         u64 summary_addr;
 303         u64 ind_offset;
 304         u32 summary_offset;
 305         u32 adapter_id;
 306 };
 307
 308 struct kvm_kernel_irq_routing_entry {
 309         u32 gsi;
 310         u32 type;
 311         int (*set)(struct kvm_kernel_irq_routing_entry *e,
 312                    struct kvm *kvm, int irq_source_id, int level,
 313                    bool line_status);
 314         union {
 315                 struct {
 316                         unsigned irqchip;
 317                         unsigned pin;
 318                 } irqchip;
 319                 struct msi_msg msi;
 320                 struct kvm_s390_adapter_int adapter;
 321         };
 322         struct hlist_node link;
 323 };
 324
 325 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
 326
 327 struct kvm_irq_routing_table {
 328         int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS];
 329         struct kvm_kernel_irq_routing_entry *rt_entries;
 330         u32 nr_rt_entries;
 331         /*
 332          * Array indexed by gsi. Each entry contains list of irq chips
 333          * the gsi is connected to.
 334          */
 335         struct hlist_head map[0];
 336 };
 337
 338 #else
 339
 340 struct kvm_irq_routing_table {};
 341
 342 #endif
 343
 344 #ifndef KVM_PRIVATE_MEM_SLOTS
 345 #define KVM_PRIVATE_MEM_SLOTS 0
 346 #endif
 347
 348 #ifndef KVM_MEM_SLOTS_NUM
 349 #define KVM_MEM_SLOTS_NUM (KVM_USER_MEM_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 350 #endif
 351
 352 /*
 353  * Note:
 354  * memslots are not sorted by id anymore, please use id_to_memslot()
 355  * to get the memslot by its id.
 356  */
 357 struct kvm_memslots {
 358         u64 generation;
 359         struct kvm_memory_slot memslots[KVM_MEM_SLOTS_NUM];
 360         /* The mapping table from slot id to the index in memslots[]. */
 361         short id_to_index[KVM_MEM_SLOTS_NUM];
 362 };
 363
 364 struct kvm {
 365         spinlock_t mmu_lock;
 366         struct mutex slots_lock;
 367         struct mm_struct *mm; /* userspace tied to this vm */
 368         struct kvm_memslots *memslots;
 369         struct srcu_struct srcu;
 370 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
 371         u32 bsp_vcpu_id;
 372 #endif
 373         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 374         atomic_t online_vcpus;
 375         int last_boosted_vcpu;
 376         struct list_head vm_list;
 377         struct mutex lock;
 378         struct kvm_io_bus *buses[KVM_NR_BUSES];
 379 #ifdef CONFIG_HAVE_KVM_EVENTFD
 380         struct {
 381                 spinlock_t        lock;
 382                 struct list_head  items;
 383                 struct list_head  resampler_list;
 384                 struct mutex      resampler_lock;
 385         } irqfds;
 386         struct list_head ioeventfds;
 387 #endif
 388         struct kvm_vm_stat stat;
 389         struct kvm_arch arch;
 390         atomic_t users_count;
 391 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 392         struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
 393         spinlock_t ring_lock;
 394         struct list_head coalesced_zones;
 395 #endif
 396
 397         struct mutex irq_lock;
 398 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 399         /*
 400          * Update side is protected by irq_lock and,
 401          * if configured, irqfds.lock.
 402          */
 403         struct kvm_irq_routing_table __rcu *irq_routing;
 404         struct hlist_head mask_notifier_list;
 405         struct hlist_head irq_ack_notifier_list;
 406 #endif
 407
 408 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 409         struct mmu_notifier mmu_notifier;
 410         unsigned long mmu_notifier_seq;
 411         long mmu_notifier_count;
 412 #endif
 413         /* Protected by mmu_lock */
 414         bool tlbs_dirty;
 415
 416         struct list_head devices;
 417 };
 418
 419 #define kvm_err(fmt, ...) \
 420         pr_err("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
 421 #define kvm_info(fmt, ...) \
 422         pr_info("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
 423 #define kvm_debug(fmt, ...) \
 424         pr_debug("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
 425 #define kvm_pr_unimpl(fmt, ...) \
 426         pr_err_ratelimited("kvm [%i]: " fmt, \
 427                            task_tgid_nr(current), ## __VA_ARGS__)
 428
 429 /* The guest did something we don't support. */
 430 #define vcpu_unimpl(vcpu, fmt, ...)                                     \
 431         kvm_pr_unimpl("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
 432
 433 static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
 434 {
 435         smp_rmb();
 436         return kvm->vcpus[i];
 437 }
 438
 439 #define kvm_for_each_vcpu(idx, vcpup, kvm) \
 440         for (idx = 0; \
 441              idx < atomic_read(&kvm->online_vcpus) && \
 442              (vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
 443              idx++)
 444
 445 #define kvm_for_each_memslot(memslot, slots)    \
 446         for (memslot = &slots->memslots[0];     \
 447               memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\
 448                 memslot++)
 449
 450 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 451 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 452
 453 int __must_check vcpu_load(struct kvm_vcpu *vcpu);
 454 void vcpu_put(struct kvm_vcpu *vcpu);
 455
 456 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
 457 int kvm_irqfd_init(void);
 458 void kvm_irqfd_exit(void);
 459 #else
 460 static inline int kvm_irqfd_init(void)
 461 {
 462         return 0;
 463 }
 464
 465 static inline void kvm_irqfd_exit(void)
 466 {
 467 }
 468 #endif
 469 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
 470                   struct module *module);
 471 void kvm_exit(void);
 472
 473 void kvm_get_kvm(struct kvm *kvm);
 474 void kvm_put_kvm(struct kvm *kvm);
 475
 476 static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
 477 {
 478         return rcu_dereference_check(kvm->memslots,
 479                         srcu_read_lock_held(&kvm->srcu)
 480                         || lockdep_is_held(&kvm->slots_lock));
 481 }
 482
 483 static inline struct kvm_memory_slot *
 484 id_to_memslot(struct kvm_memslots *slots, int id)
 485 {
 486         int index = slots->id_to_index[id];
 487         struct kvm_memory_slot *slot;
 488
 489         slot = &slots->memslots[index];
 490
 491         WARN_ON(slot->id != id);
 492         return slot;
 493 }
 494
 495 /*
 496  * KVM_SET_USER_MEMORY_REGION ioctl allows the following operations:
 497  * - create a new memory slot
 498  * - delete an existing memory slot
 499  * - modify an existing memory slot
 500  *   -- move it in the guest physical memory space
 501  *   -- just change its flags
 502  *
 503  * Since flags can be changed by some of these operations, the following
 504  * differentiation is the best we can do for __kvm_set_memory_region():
 505  */
 506 enum kvm_mr_change {
 507         KVM_MR_CREATE,
 508         KVM_MR_DELETE,
 509         KVM_MR_MOVE,
 510         KVM_MR_FLAGS_ONLY,
 511 };
 512
 513 int kvm_set_memory_region(struct kvm *kvm,
 514                           struct kvm_userspace_memory_region *mem);
 515 int __kvm_set_memory_region(struct kvm *kvm,
 516                             struct kvm_userspace_memory_region *mem);
 517 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
 518                            struct kvm_memory_slot *dont);
 519 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
 520                             unsigned long npages);
 521 void kvm_arch_memslots_updated(struct kvm *kvm);
 522 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 523                                 struct kvm_memory_slot *memslot,
 524                                 struct kvm_userspace_memory_region *mem,
 525                                 enum kvm_mr_change change);
 526 void kvm_arch_commit_memory_region(struct kvm *kvm,
 527                                 struct kvm_userspace_memory_region *mem,
 528                                 const struct kvm_memory_slot *old,
 529                                 enum kvm_mr_change change);
 530 bool kvm_largepages_enabled(void);
 531 void kvm_disable_largepages(void);
 532 /* flush all memory translations */
 533 void kvm_arch_flush_shadow_all(struct kvm *kvm);
 534 /* flush memory translations pointing to 'slot' */
 535 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 536                                    struct kvm_memory_slot *slot);
 537
 538 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
 539                             int nr_pages);
 540
 541 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 542 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
 543 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable);
 544 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
 545 void kvm_release_page_clean(struct page *page);
 546 void kvm_release_page_dirty(struct page *page);
 547 void kvm_set_page_accessed(struct page *page);
 548
 549 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn);
 550 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
 551                        bool write_fault, bool *writable);
 552 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
 553 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
 554                       bool *writable);
 555 pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
 556 pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn);
 557
 558 void kvm_release_pfn_clean(pfn_t pfn);
 559 void kvm_set_pfn_dirty(pfn_t pfn);
 560 void kvm_set_pfn_accessed(pfn_t pfn);
 561 void kvm_get_pfn(pfn_t pfn);
 562
 563 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 564                         int len);
 565 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
 566                           unsigned long len);
 567 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
 568 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 569                            void *data, unsigned long len);
 570 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 571                          int offset, int len);
 572 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 573                     unsigned long len);
 574 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 575                            void *data, unsigned long len);
 576 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 577                               gpa_t gpa, unsigned long len);
 578 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
 579 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
 580 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 581 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
 582 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
 583 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 584
 585 void kvm_vcpu_block(struct kvm_vcpu *vcpu);
 586 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
 587 bool kvm_vcpu_yield_to(struct kvm_vcpu *target);
 588 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
 589 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 590 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 591
 592 void kvm_flush_remote_tlbs(struct kvm *kvm);
 593 void kvm_reload_remote_mmus(struct kvm *kvm);
 594 void kvm_make_mclock_inprogress_request(struct kvm *kvm);
 595 void kvm_make_scan_ioapic_request(struct kvm *kvm);
 596
 597 long kvm_arch_dev_ioctl(struct file *filp,
 598                         unsigned int ioctl, unsigned long arg);
 599 long kvm_arch_vcpu_ioctl(struct file *filp,
 600                          unsigned int ioctl, unsigned long arg);
 601 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);
 602
 603 int kvm_dev_ioctl_check_extension(long ext);
 604
 605 int kvm_get_dirty_log(struct kvm *kvm,
 606                         struct kvm_dirty_log *log, int *is_dirty);
 607 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 608                                 struct kvm_dirty_log *log);
 609
 610 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
 611                         bool line_status);
 612 long kvm_arch_vm_ioctl(struct file *filp,
 613                        unsigned int ioctl, unsigned long arg);
 614
 615 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 616 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 617
 618 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 619                                     struct kvm_translation *tr);
 620
 621 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 622 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 623 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 624                                   struct kvm_sregs *sregs);
 625 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 626                                   struct kvm_sregs *sregs);
 627 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 628                                     struct kvm_mp_state *mp_state);
 629 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 630                                     struct kvm_mp_state *mp_state);
 631 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 632                                         struct kvm_guest_debug *dbg);
 633 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
 634
 635 int kvm_arch_init(void *opaque);
 636 void kvm_arch_exit(void);
 637
 638 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
 639 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
 640
 641 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
 642 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 643 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 644 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
 645 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
 646 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);
 647 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
 648
 649 int kvm_arch_hardware_enable(void *garbage);
 650 void kvm_arch_hardware_disable(void *garbage);
 651 int kvm_arch_hardware_setup(void);
 652 void kvm_arch_hardware_unsetup(void);
 653 void kvm_arch_check_processor_compat(void *rtn);
 654 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
 655 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
 656
 657 void *kvm_kvzalloc(unsigned long size);
 658 void kvm_kvfree(const void *addr);
 659
 660 #ifndef __KVM_HAVE_ARCH_VM_ALLOC
 661 static inline struct kvm *kvm_arch_alloc_vm(void)
 662 {
 663         return kzalloc(sizeof(struct kvm), GFP_KERNEL);
 664 }
 665
 666 static inline void kvm_arch_free_vm(struct kvm *kvm)
 667 {
 668         kfree(kvm);
 669 }
 670 #endif
 671
 672 #ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA
 673 void kvm_arch_register_noncoherent_dma(struct kvm *kvm);
 674 void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm);
 675 bool kvm_arch_has_noncoherent_dma(struct kvm *kvm);
 676 #else
 677 static inline void kvm_arch_register_noncoherent_dma(struct kvm *kvm)
 678 {
 679 }
 680
 681 static inline void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm)
 682 {
 683 }
 684
 685 static inline bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
 686 {
 687         return false;
 688 }
 689 #endif
 690
 691 static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
 692 {
 693 #ifdef __KVM_HAVE_ARCH_WQP
 694         return vcpu->arch.wqp;
 695 #else
 696         return &vcpu->wq;
 697 #endif
 698 }
 699
 700 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
 701 void kvm_arch_destroy_vm(struct kvm *kvm);
 702 void kvm_arch_sync_events(struct kvm *kvm);
 703
 704 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
 705 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
 706
 707 bool kvm_is_mmio_pfn(pfn_t pfn);
 708
 709 struct kvm_irq_ack_notifier {
 710         struct hlist_node link;
 711         unsigned gsi;
 712         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
 713 };
 714
 715 struct kvm_assigned_dev_kernel {
 716         struct kvm_irq_ack_notifier ack_notifier;
 717         struct list_head list;
 718         int assigned_dev_id;
 719         int host_segnr;
 720         int host_busnr;
 721         int host_devfn;
 722         unsigned int entries_nr;
 723         int host_irq;
 724         bool host_irq_disabled;
 725         bool pci_2_3;
 726         struct msix_entry *host_msix_entries;
 727         int guest_irq;
 728         struct msix_entry *guest_msix_entries;
 729         unsigned long irq_requested_type;
 730         int irq_source_id;
 731         int flags;
 732         struct pci_dev *dev;
 733         struct kvm *kvm;
 734         spinlock_t intx_lock;
 735         spinlock_t intx_mask_lock;
 736         char irq_name[32];
 737         struct pci_saved_state *pci_saved_state;
 738 };
 739
 740 struct kvm_irq_mask_notifier {
 741         void (*func)(struct kvm_irq_mask_notifier *kimn, bool masked);
 742         int irq;
 743         struct hlist_node link;
 744 };
 745
 746 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
 747                                     struct kvm_irq_mask_notifier *kimn);
 748 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 749                                       struct kvm_irq_mask_notifier *kimn);
 750 void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
 751                              bool mask);
 752
 753 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
 754                 bool line_status);
 755 int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level);
 756 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
 757                 int irq_source_id, int level, bool line_status);
 758 bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);
 759 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
 760 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 761                                    struct kvm_irq_ack_notifier *kian);
 762 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
 763                                    struct kvm_irq_ack_notifier *kian);
 764 int kvm_request_irq_source_id(struct kvm *kvm);
 765 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
 766
 767 #ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
 768 int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
 769 void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
 770 int kvm_iommu_map_guest(struct kvm *kvm);
 771 int kvm_iommu_unmap_guest(struct kvm *kvm);
 772 int kvm_assign_device(struct kvm *kvm,
 773                       struct kvm_assigned_dev_kernel *assigned_dev);
 774 int kvm_deassign_device(struct kvm *kvm,
 775                         struct kvm_assigned_dev_kernel *assigned_dev);
 776 #else
 777 static inline int kvm_iommu_map_pages(struct kvm *kvm,
 778                                       struct kvm_memory_slot *slot)
 779 {
 780         return 0;
 781 }
 782
 783 static inline void kvm_iommu_unmap_pages(struct kvm *kvm,
 784                                          struct kvm_memory_slot *slot)
 785 {
 786 }
 787
 788 static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
 789 {
 790         return 0;
 791 }
 792 #endif
 793
 794 static inline void kvm_guest_enter(void)
 795 {
 796         unsigned long flags;
 797
 798         BUG_ON(preemptible());
 799
 800         local_irq_save(flags);
 801         guest_enter();
 802         local_irq_restore(flags);
 803
 804         /* KVM does not hold any references to rcu protected data when it
 805          * switches CPU into a guest mode. In fact switching to a guest mode
 806          * is very similar to exiting to userspace from rcu point of view. In
 807          * addition CPU may stay in a guest mode for quite a long time (up to
 808          * one time slice). Lets treat guest mode as quiescent state, just like
 809          * we do with user-mode execution.
 810          */
 811         rcu_virt_note_context_switch(smp_processor_id());
 812 }
 813
 814 static inline void kvm_guest_exit(void)
 815 {
 816         unsigned long flags;
 817
 818         local_irq_save(flags);
 819         guest_exit();
 820         local_irq_restore(flags);
 821 }
 822
 823 /*
 824  * search_memslots() and __gfn_to_memslot() are here because they are
 825  * used in non-modular code in arch/powerpc/kvm/book3s_hv_rm_mmu.c.
 826  * gfn_to_memslot() itself isn't here as an inline because that would
 827  * bloat other code too much.
 828  */
 829 static inline struct kvm_memory_slot *
 830 search_memslots(struct kvm_memslots *slots, gfn_t gfn)
 831 {
 832         struct kvm_memory_slot *memslot;
 833
 834         kvm_for_each_memslot(memslot, slots)
 835                 if (gfn >= memslot->base_gfn &&
 836                       gfn < memslot->base_gfn + memslot->npages)
 837                         return memslot;
 838
 839         return NULL;
 840 }
 841
 842 static inline struct kvm_memory_slot *
 843 __gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
 844 {
 845         return search_memslots(slots, gfn);
 846 }
 847
 848 static inline unsigned long
 849 __gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
 850 {
 851         return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
 852 }
 853
 854 static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
 855 {
 856         return gfn_to_memslot(kvm, gfn)->id;
 857 }
 858
 859 static inline gfn_t
 860 hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot)
 861 {
 862         gfn_t gfn_offset = (hva - slot->userspace_addr) >> PAGE_SHIFT;
 863
 864         return slot->base_gfn + gfn_offset;
 865 }
 866
 867 static inline gpa_t gfn_to_gpa(gfn_t gfn)
 868 {
 869         return (gpa_t)gfn << PAGE_SHIFT;
 870 }
 871
 872 static inline gfn_t gpa_to_gfn(gpa_t gpa)
 873 {
 874         return (gfn_t)(gpa >> PAGE_SHIFT);
 875 }
 876
 877 static inline hpa_t pfn_to_hpa(pfn_t pfn)
 878 {
 879         return (hpa_t)pfn << PAGE_SHIFT;
 880 }
 881
 882 static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
 883 {
 884         set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
 885 }
 886
 887 enum kvm_stat_kind {
 888         KVM_STAT_VM,
 889         KVM_STAT_VCPU,
 890 };
 891
 892 struct kvm_stats_debugfs_item {
 893         const char *name;
 894         int offset;
 895         enum kvm_stat_kind kind;
 896         struct dentry *dentry;
 897 };
 898 extern struct kvm_stats_debugfs_item debugfs_entries[];
 899 extern struct dentry *kvm_debugfs_dir;
 900
 901 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 902 static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
 903 {
 904         if (unlikely(kvm->mmu_notifier_count))
 905                 return 1;
 906         /*
 907          * Ensure the read of mmu_notifier_count happens before the read
 908          * of mmu_notifier_seq.  This interacts with the smp_wmb() in
 909          * mmu_notifier_invalidate_range_end to make sure that the caller
 910          * either sees the old (non-zero) value of mmu_notifier_count or
 911          * the new (incremented) value of mmu_notifier_seq.
 912          * PowerPC Book3s HV KVM calls this under a per-page lock
 913          * rather than under kvm->mmu_lock, for scalability, so
 914          * can't rely on kvm->mmu_lock to keep things ordered.
 915          */
 916         smp_rmb();
 917         if (kvm->mmu_notifier_seq != mmu_seq)
 918                 return 1;
 919         return 0;
 920 }
 921 #endif
 922
 923 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
 924
 925 #ifdef CONFIG_S390
 926 #define KVM_MAX_IRQ_ROUTES 4096 //FIXME: we can have more than that...
 927 #else
 928 #define KVM_MAX_IRQ_ROUTES 1024
 929 #endif
 930
 931 int kvm_setup_default_irq_routing(struct kvm *kvm);
 932 int kvm_set_irq_routing(struct kvm *kvm,
 933                         const struct kvm_irq_routing_entry *entries,
 934                         unsigned nr,
 935                         unsigned flags);
 936 int kvm_set_routing_entry(struct kvm_irq_routing_table *rt,
 937                           struct kvm_kernel_irq_routing_entry *e,
 938                           const struct kvm_irq_routing_entry *ue);
 939 void kvm_free_irq_routing(struct kvm *kvm);
 940
 941 int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
 942
 943 #else
 944
 945 static inline void kvm_free_irq_routing(struct kvm *kvm) {}
 946
 947 #endif
 948
 949 #ifdef CONFIG_HAVE_KVM_EVENTFD
 950
 951 void kvm_eventfd_init(struct kvm *kvm);
 952 int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
 953
 954 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 955 int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args);
 956 void kvm_irqfd_release(struct kvm *kvm);
 957 void kvm_irq_routing_update(struct kvm *, struct kvm_irq_routing_table *);
 958 #else
 959 static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
 960 {
 961         return -EINVAL;
 962 }
 963
 964 static inline void kvm_irqfd_release(struct kvm *kvm) {}
 965 #endif
 966
 967 #else
 968
 969 static inline void kvm_eventfd_init(struct kvm *kvm) {}
 970
 971 static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
 972 {
 973         return -EINVAL;
 974 }
 975
 976 static inline void kvm_irqfd_release(struct kvm *kvm) {}
 977
 978 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 979 static inline void kvm_irq_routing_update(struct kvm *kvm,
 980                                           struct kvm_irq_routing_table *irq_rt)
 981 {
 982         rcu_assign_pointer(kvm->irq_routing, irq_rt);
 983 }
 984 #endif
 985
 986 static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
 987 {
 988         return -ENOSYS;
 989 }
 990
 991 #endif /* CONFIG_HAVE_KVM_EVENTFD */
 992
 993 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
 994 static inline bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
 995 {
 996         return vcpu->kvm->bsp_vcpu_id == vcpu->vcpu_id;
 997 }
 998
 999 bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu);
1000
1001 #else
1002
1003 static inline bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) { return true; }
1004
1005 #endif
1006
1007 #ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
1008
1009 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
1010                                   unsigned long arg);
1011
1012 void kvm_free_all_assigned_devices(struct kvm *kvm);
1013
1014 #else
1015
1016 static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
1017                                                 unsigned long arg)
1018 {
1019         return -ENOTTY;
1020 }
1021
1022 static inline void kvm_free_all_assigned_devices(struct kvm *kvm) {}
1023
1024 #endif
1025
1026 static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
1027 {
1028         set_bit(req, &vcpu->requests);
1029 }
1030
1031 static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
1032 {
1033         if (test_bit(req, &vcpu->requests)) {
1034                 clear_bit(req, &vcpu->requests);
1035                 return true;
1036         } else {
1037                 return false;
1038         }
1039 }
1040
1041 extern bool kvm_rebooting;
1042
1043 struct kvm_device_ops;
1044
1045 struct kvm_device {
1046         struct kvm_device_ops *ops;
1047         struct kvm *kvm;
1048         void *private;
1049         struct list_head vm_node;
1050 };
1051
1052 /* create, destroy, and name are mandatory */
1053 struct kvm_device_ops {
1054         const char *name;
1055         int (*create)(struct kvm_device *dev, u32 type);
1056
1057         /*
1058          * Destroy is responsible for freeing dev.
1059          *
1060          * Destroy may be called before or after destructors are called
1061          * on emulated I/O regions, depending on whether a reference is
1062          * held by a vcpu or other kvm component that gets destroyed
1063          * after the emulated I/O.
1064          */
1065         void (*destroy)(struct kvm_device *dev);
1066
1067         int (*set_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
1068         int (*get_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
1069         int (*has_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
1070         long (*ioctl)(struct kvm_device *dev, unsigned int ioctl,
1071                       unsigned long arg);
1072 };
1073
1074 void kvm_device_get(struct kvm_device *dev);
1075 void kvm_device_put(struct kvm_device *dev);
1076 struct kvm_device *kvm_device_from_filp(struct file *filp);
1077
1078 extern struct kvm_device_ops kvm_mpic_ops;
1079 extern struct kvm_device_ops kvm_xics_ops;
1080 extern struct kvm_device_ops kvm_vfio_ops;
1081 extern struct kvm_device_ops kvm_arm_vgic_v2_ops;
1082 extern struct kvm_device_ops kvm_flic_ops;
1083
1084 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1085
1086 static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
1087 {
1088         vcpu->spin_loop.in_spin_loop = val;
1089 }
1090 static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
1091 {
1092         vcpu->spin_loop.dy_eligible = val;
1093 }
1094
1095 #else /* !CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
1096
1097 static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
1098 {
1099 }
1100
1101 static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
1102 {
1103 }
1104 #endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
1105 #endif
1106