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TOMOYO Linux Cross Reference
Linux/include/linux/kvm_host.h

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  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 /*
 37  * The bit 16 ~ bit 31 of kvm_memory_region::flags are internally used
 38  * in kvm, other bits are visible for userspace which are defined in
 39  * include/linux/kvm_h.
 40  */
 41 #define KVM_MEMSLOT_INVALID     (1UL << 16)
 42 #define KVM_MEMSLOT_INCOHERENT  (1UL << 17)
 43 
 44 /* Two fragments for cross MMIO pages. */
 45 #define KVM_MAX_MMIO_FRAGMENTS  2
 46 
 47 /*
 48  * For the normal pfn, the highest 12 bits should be zero,
 49  * so we can mask bit 62 ~ bit 52  to indicate the error pfn,
 50  * mask bit 63 to indicate the noslot pfn.
 51  */
 52 #define KVM_PFN_ERR_MASK        (0x7ffULL << 52)
 53 #define KVM_PFN_ERR_NOSLOT_MASK (0xfffULL << 52)
 54 #define KVM_PFN_NOSLOT          (0x1ULL << 63)
 55 
 56 #define KVM_PFN_ERR_FAULT       (KVM_PFN_ERR_MASK)
 57 #define KVM_PFN_ERR_HWPOISON    (KVM_PFN_ERR_MASK + 1)
 58 #define KVM_PFN_ERR_RO_FAULT    (KVM_PFN_ERR_MASK + 2)
 59 
 60 /*
 61  * error pfns indicate that the gfn is in slot but faild to
 62  * translate it to pfn on host.
 63  */
 64 static inline bool is_error_pfn(pfn_t pfn)
 65 {
 66         return !!(pfn & KVM_PFN_ERR_MASK);
 67 }
 68 
 69 /*
 70  * error_noslot pfns indicate that the gfn can not be
 71  * translated to pfn - it is not in slot or failed to
 72  * translate it to pfn.
 73  */
 74 static inline bool is_error_noslot_pfn(pfn_t pfn)
 75 {
 76         return !!(pfn & KVM_PFN_ERR_NOSLOT_MASK);
 77 }
 78 
 79 /* noslot pfn indicates that the gfn is not in slot. */
 80 static inline bool is_noslot_pfn(pfn_t pfn)
 81 {
 82         return pfn == KVM_PFN_NOSLOT;
 83 }
 84 
 85 /*
 86  * architectures with KVM_HVA_ERR_BAD other than PAGE_OFFSET (e.g. s390)
 87  * provide own defines and kvm_is_error_hva
 88  */
 89 #ifndef KVM_HVA_ERR_BAD
 90 
 91 #define KVM_HVA_ERR_BAD         (PAGE_OFFSET)
 92 #define KVM_HVA_ERR_RO_BAD      (PAGE_OFFSET + PAGE_SIZE)
 93 
 94 static inline bool kvm_is_error_hva(unsigned long addr)
 95 {
 96         return addr >= PAGE_OFFSET;
 97 }
 98 
 99 #endif
100 
101 #define KVM_ERR_PTR_BAD_PAGE    (ERR_PTR(-ENOENT))
102 
103 static inline bool is_error_page(struct page *page)
104 {
105         return IS_ERR(page);
106 }
107 
108 /*
109  * vcpu->requests bit members
110  */
111 #define KVM_REQ_TLB_FLUSH          0
112 #define KVM_REQ_MIGRATE_TIMER      1
113 #define KVM_REQ_REPORT_TPR_ACCESS  2
114 #define KVM_REQ_MMU_RELOAD         3
115 #define KVM_REQ_TRIPLE_FAULT       4
116 #define KVM_REQ_PENDING_TIMER      5
117 #define KVM_REQ_UNHALT             6
118 #define KVM_REQ_MMU_SYNC           7
119 #define KVM_REQ_CLOCK_UPDATE       8
120 #define KVM_REQ_KICK               9
121 #define KVM_REQ_DEACTIVATE_FPU    10
122 #define KVM_REQ_EVENT             11
123 #define KVM_REQ_APF_HALT          12
124 #define KVM_REQ_STEAL_UPDATE      13
125 #define KVM_REQ_NMI               14
126 #define KVM_REQ_PMU               15
127 #define KVM_REQ_PMI               16
128 #define KVM_REQ_WATCHDOG          17
129 #define KVM_REQ_MASTERCLOCK_UPDATE 18
130 #define KVM_REQ_MCLOCK_INPROGRESS 19
131 #define KVM_REQ_EPR_EXIT          20
132 #define KVM_REQ_SCAN_IOAPIC       21
133 #define KVM_REQ_GLOBAL_CLOCK_UPDATE 22
134 #define KVM_REQ_ENABLE_IBS        23
135 #define KVM_REQ_DISABLE_IBS       24
136 #define KVM_REQ_APIC_PAGE_RELOAD  25
137 
138 #define KVM_USERSPACE_IRQ_SOURCE_ID             0
139 #define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID        1
140 
141 extern struct kmem_cache *kvm_vcpu_cache;
142 
143 extern spinlock_t kvm_lock;
144 extern struct list_head vm_list;
145 
146 struct kvm_io_range {
147         gpa_t addr;
148         int len;
149         struct kvm_io_device *dev;
150 };
151 
152 #define NR_IOBUS_DEVS 1000
153 
154 struct kvm_io_bus {
155         int dev_count;
156         int ioeventfd_count;
157         struct kvm_io_range range[];
158 };
159 
160 enum kvm_bus {
161         KVM_MMIO_BUS,
162         KVM_PIO_BUS,
163         KVM_VIRTIO_CCW_NOTIFY_BUS,
164         KVM_FAST_MMIO_BUS,
165         KVM_NR_BUSES
166 };
167 
168 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
169                      int len, const void *val);
170 int kvm_io_bus_write_cookie(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
171                             int len, const void *val, long cookie);
172 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len,
173                     void *val);
174 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
175                             int len, struct kvm_io_device *dev);
176 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
177                               struct kvm_io_device *dev);
178 
179 #ifdef CONFIG_KVM_ASYNC_PF
180 struct kvm_async_pf {
181         struct work_struct work;
182         struct list_head link;
183         struct list_head queue;
184         struct kvm_vcpu *vcpu;
185         struct mm_struct *mm;
186         gva_t gva;
187         unsigned long addr;
188         struct kvm_arch_async_pf arch;
189         bool   wakeup_all;
190 };
191 
192 void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);
193 void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu);
194 int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, unsigned long hva,
195                        struct kvm_arch_async_pf *arch);
196 int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
197 #endif
198 
199 enum {
200         OUTSIDE_GUEST_MODE,
201         IN_GUEST_MODE,
202         EXITING_GUEST_MODE,
203         READING_SHADOW_PAGE_TABLES,
204 };
205 
206 /*
207  * Sometimes a large or cross-page mmio needs to be broken up into separate
208  * exits for userspace servicing.
209  */
210 struct kvm_mmio_fragment {
211         gpa_t gpa;
212         void *data;
213         unsigned len;
214 };
215 
216 struct kvm_vcpu {
217         struct kvm *kvm;
218 #ifdef CONFIG_PREEMPT_NOTIFIERS
219         struct preempt_notifier preempt_notifier;
220 #endif
221         int cpu;
222         int vcpu_id;
223         int srcu_idx;
224         int mode;
225         unsigned long requests;
226         unsigned long guest_debug;
227 
228         struct mutex mutex;
229         struct kvm_run *run;
230 
231         int fpu_active;
232         int guest_fpu_loaded, guest_xcr0_loaded;
233         wait_queue_head_t wq;
234         struct pid *pid;
235         int sigset_active;
236         sigset_t sigset;
237         struct kvm_vcpu_stat stat;
238 
239 #ifdef CONFIG_HAS_IOMEM
240         int mmio_needed;
241         int mmio_read_completed;
242         int mmio_is_write;
243         int mmio_cur_fragment;
244         int mmio_nr_fragments;
245         struct kvm_mmio_fragment mmio_fragments[KVM_MAX_MMIO_FRAGMENTS];
246 #endif
247 
248 #ifdef CONFIG_KVM_ASYNC_PF
249         struct {
250                 u32 queued;
251                 struct list_head queue;
252                 struct list_head done;
253                 spinlock_t lock;
254         } async_pf;
255 #endif
256 
257 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
258         /*
259          * Cpu relax intercept or pause loop exit optimization
260          * in_spin_loop: set when a vcpu does a pause loop exit
261          *  or cpu relax intercepted.
262          * dy_eligible: indicates whether vcpu is eligible for directed yield.
263          */
264         struct {
265                 bool in_spin_loop;
266                 bool dy_eligible;
267         } spin_loop;
268 #endif
269         bool preempted;
270         struct kvm_vcpu_arch arch;
271 };
272 
273 static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
274 {
275         return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
276 }
277 
278 /*
279  * Some of the bitops functions do not support too long bitmaps.
280  * This number must be determined not to exceed such limits.
281  */
282 #define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
283 
284 struct kvm_memory_slot {
285         gfn_t base_gfn;
286         unsigned long npages;
287         unsigned long *dirty_bitmap;
288         struct kvm_arch_memory_slot arch;
289         unsigned long userspace_addr;
290         u32 flags;
291         short id;
292 };
293 
294 static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
295 {
296         return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
297 }
298 
299 struct kvm_s390_adapter_int {
300         u64 ind_addr;
301         u64 summary_addr;
302         u64 ind_offset;
303         u32 summary_offset;
304         u32 adapter_id;
305 };
306 
307 struct kvm_kernel_irq_routing_entry {
308         u32 gsi;
309         u32 type;
310         int (*set)(struct kvm_kernel_irq_routing_entry *e,
311                    struct kvm *kvm, int irq_source_id, int level,
312                    bool line_status);
313         union {
314                 struct {
315                         unsigned irqchip;
316                         unsigned pin;
317                 } irqchip;
318                 struct msi_msg msi;
319                 struct kvm_s390_adapter_int adapter;
320         };
321         struct hlist_node link;
322 };
323 
324 #ifndef KVM_PRIVATE_MEM_SLOTS
325 #define KVM_PRIVATE_MEM_SLOTS 0
326 #endif
327 
328 #ifndef KVM_MEM_SLOTS_NUM
329 #define KVM_MEM_SLOTS_NUM (KVM_USER_MEM_SLOTS + KVM_PRIVATE_MEM_SLOTS)
330 #endif
331 
332 /*
333  * Note:
334  * memslots are not sorted by id anymore, please use id_to_memslot()
335  * to get the memslot by its id.
336  */
337 struct kvm_memslots {
338         u64 generation;
339         struct kvm_memory_slot memslots[KVM_MEM_SLOTS_NUM];
340         /* The mapping table from slot id to the index in memslots[]. */
341         short id_to_index[KVM_MEM_SLOTS_NUM];
342         atomic_t lru_slot;
343         int used_slots;
344 };
345 
346 struct kvm {
347         spinlock_t mmu_lock;
348         struct mutex slots_lock;
349         struct mm_struct *mm; /* userspace tied to this vm */
350         struct kvm_memslots *memslots;
351         struct srcu_struct srcu;
352         struct srcu_struct irq_srcu;
353 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
354         u32 bsp_vcpu_id;
355 #endif
356         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
357         atomic_t online_vcpus;
358         int last_boosted_vcpu;
359         struct list_head vm_list;
360         struct mutex lock;
361         struct kvm_io_bus *buses[KVM_NR_BUSES];
362 #ifdef CONFIG_HAVE_KVM_EVENTFD
363         struct {
364                 spinlock_t        lock;
365                 struct list_head  items;
366                 struct list_head  resampler_list;
367                 struct mutex      resampler_lock;
368         } irqfds;
369         struct list_head ioeventfds;
370 #endif
371         struct kvm_vm_stat stat;
372         struct kvm_arch arch;
373         atomic_t users_count;
374 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
375         struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
376         spinlock_t ring_lock;
377         struct list_head coalesced_zones;
378 #endif
379 
380         struct mutex irq_lock;
381 #ifdef CONFIG_HAVE_KVM_IRQCHIP
382         /*
383          * Update side is protected by irq_lock.
384          */
385         struct kvm_irq_routing_table __rcu *irq_routing;
386 #endif
387 #ifdef CONFIG_HAVE_KVM_IRQFD
388         struct hlist_head irq_ack_notifier_list;
389 #endif
390 
391 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
392         struct mmu_notifier mmu_notifier;
393         unsigned long mmu_notifier_seq;
394         long mmu_notifier_count;
395 #endif
396         long tlbs_dirty;
397         struct list_head devices;
398 };
399 
400 #define kvm_err(fmt, ...) \
401         pr_err("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
402 #define kvm_info(fmt, ...) \
403         pr_info("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
404 #define kvm_debug(fmt, ...) \
405         pr_debug("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
406 #define kvm_pr_unimpl(fmt, ...) \
407         pr_err_ratelimited("kvm [%i]: " fmt, \
408                            task_tgid_nr(current), ## __VA_ARGS__)
409 
410 /* The guest did something we don't support. */
411 #define vcpu_unimpl(vcpu, fmt, ...)                                     \
412         kvm_pr_unimpl("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
413 
414 static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
415 {
416         smp_rmb();
417         return kvm->vcpus[i];
418 }
419 
420 #define kvm_for_each_vcpu(idx, vcpup, kvm) \
421         for (idx = 0; \
422              idx < atomic_read(&kvm->online_vcpus) && \
423              (vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
424              idx++)
425 
426 #define kvm_for_each_memslot(memslot, slots)    \
427         for (memslot = &slots->memslots[0];     \
428               memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\
429                 memslot++)
430 
431 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
432 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
433 
434 int __must_check vcpu_load(struct kvm_vcpu *vcpu);
435 void vcpu_put(struct kvm_vcpu *vcpu);
436 
437 #ifdef __KVM_HAVE_IOAPIC
438 void kvm_vcpu_request_scan_ioapic(struct kvm *kvm);
439 #else
440 static inline void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
441 {
442 }
443 #endif
444 
445 #ifdef CONFIG_HAVE_KVM_IRQFD
446 int kvm_irqfd_init(void);
447 void kvm_irqfd_exit(void);
448 #else
449 static inline int kvm_irqfd_init(void)
450 {
451         return 0;
452 }
453 
454 static inline void kvm_irqfd_exit(void)
455 {
456 }
457 #endif
458 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
459                   struct module *module);
460 void kvm_exit(void);
461 
462 void kvm_get_kvm(struct kvm *kvm);
463 void kvm_put_kvm(struct kvm *kvm);
464 
465 static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
466 {
467         return rcu_dereference_check(kvm->memslots,
468                         srcu_read_lock_held(&kvm->srcu)
469                         || lockdep_is_held(&kvm->slots_lock));
470 }
471 
472 static inline struct kvm_memory_slot *
473 id_to_memslot(struct kvm_memslots *slots, int id)
474 {
475         int index = slots->id_to_index[id];
476         struct kvm_memory_slot *slot;
477 
478         slot = &slots->memslots[index];
479 
480         WARN_ON(slot->id != id);
481         return slot;
482 }
483 
484 /*
485  * KVM_SET_USER_MEMORY_REGION ioctl allows the following operations:
486  * - create a new memory slot
487  * - delete an existing memory slot
488  * - modify an existing memory slot
489  *   -- move it in the guest physical memory space
490  *   -- just change its flags
491  *
492  * Since flags can be changed by some of these operations, the following
493  * differentiation is the best we can do for __kvm_set_memory_region():
494  */
495 enum kvm_mr_change {
496         KVM_MR_CREATE,
497         KVM_MR_DELETE,
498         KVM_MR_MOVE,
499         KVM_MR_FLAGS_ONLY,
500 };
501 
502 int kvm_set_memory_region(struct kvm *kvm,
503                           struct kvm_userspace_memory_region *mem);
504 int __kvm_set_memory_region(struct kvm *kvm,
505                             struct kvm_userspace_memory_region *mem);
506 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
507                            struct kvm_memory_slot *dont);
508 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
509                             unsigned long npages);
510 void kvm_arch_memslots_updated(struct kvm *kvm);
511 int kvm_arch_prepare_memory_region(struct kvm *kvm,
512                                 struct kvm_memory_slot *memslot,
513                                 struct kvm_userspace_memory_region *mem,
514                                 enum kvm_mr_change change);
515 void kvm_arch_commit_memory_region(struct kvm *kvm,
516                                 struct kvm_userspace_memory_region *mem,
517                                 const struct kvm_memory_slot *old,
518                                 enum kvm_mr_change change);
519 bool kvm_largepages_enabled(void);
520 void kvm_disable_largepages(void);
521 /* flush all memory translations */
522 void kvm_arch_flush_shadow_all(struct kvm *kvm);
523 /* flush memory translations pointing to 'slot' */
524 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
525                                    struct kvm_memory_slot *slot);
526 
527 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
528                             int nr_pages);
529 
530 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
531 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
532 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable);
533 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
534 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, gfn_t gfn,
535                                       bool *writable);
536 void kvm_release_page_clean(struct page *page);
537 void kvm_release_page_dirty(struct page *page);
538 void kvm_set_page_accessed(struct page *page);
539 
540 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn);
541 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
542                        bool write_fault, bool *writable);
543 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
544 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
545                       bool *writable);
546 pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
547 pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn);
548 
549 void kvm_release_pfn_clean(pfn_t pfn);
550 void kvm_set_pfn_dirty(pfn_t pfn);
551 void kvm_set_pfn_accessed(pfn_t pfn);
552 void kvm_get_pfn(pfn_t pfn);
553 
554 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
555                         int len);
556 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
557                           unsigned long len);
558 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
559 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
560                            void *data, unsigned long len);
561 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
562                          int offset, int len);
563 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
564                     unsigned long len);
565 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
566                            void *data, unsigned long len);
567 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
568                               gpa_t gpa, unsigned long len);
569 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
570 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
571 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
572 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
573 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
574 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
575 
576 void kvm_vcpu_block(struct kvm_vcpu *vcpu);
577 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
578 int kvm_vcpu_yield_to(struct kvm_vcpu *target);
579 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
580 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
581 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
582 
583 void kvm_flush_remote_tlbs(struct kvm *kvm);
584 void kvm_reload_remote_mmus(struct kvm *kvm);
585 void kvm_make_mclock_inprogress_request(struct kvm *kvm);
586 void kvm_make_scan_ioapic_request(struct kvm *kvm);
587 bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);
588 
589 long kvm_arch_dev_ioctl(struct file *filp,
590                         unsigned int ioctl, unsigned long arg);
591 long kvm_arch_vcpu_ioctl(struct file *filp,
592                          unsigned int ioctl, unsigned long arg);
593 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);
594 
595 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext);
596 
597 int kvm_get_dirty_log(struct kvm *kvm,
598                         struct kvm_dirty_log *log, int *is_dirty);
599 
600 int kvm_get_dirty_log_protect(struct kvm *kvm,
601                         struct kvm_dirty_log *log, bool *is_dirty);
602 
603 void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
604                                         struct kvm_memory_slot *slot,
605                                         gfn_t gfn_offset,
606                                         unsigned long mask);
607 
608 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
609                                 struct kvm_dirty_log *log);
610 
611 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
612                         bool line_status);
613 long kvm_arch_vm_ioctl(struct file *filp,
614                        unsigned int ioctl, unsigned long arg);
615 
616 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
617 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
618 
619 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
620                                     struct kvm_translation *tr);
621 
622 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
623 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
624 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
625                                   struct kvm_sregs *sregs);
626 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
627                                   struct kvm_sregs *sregs);
628 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
629                                     struct kvm_mp_state *mp_state);
630 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
631                                     struct kvm_mp_state *mp_state);
632 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
633                                         struct kvm_guest_debug *dbg);
634 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
635 
636 int kvm_arch_init(void *opaque);
637 void kvm_arch_exit(void);
638 
639 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
640 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
641 
642 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu);
643 
644 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
645 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
646 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
647 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
648 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
649 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);
650 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
651 
652 int kvm_arch_hardware_enable(void);
653 void kvm_arch_hardware_disable(void);
654 int kvm_arch_hardware_setup(void);
655 void kvm_arch_hardware_unsetup(void);
656 void kvm_arch_check_processor_compat(void *rtn);
657 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
658 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
659 
660 void *kvm_kvzalloc(unsigned long size);
661 void kvm_kvfree(const void *addr);
662 
663 #ifndef __KVM_HAVE_ARCH_VM_ALLOC
664 static inline struct kvm *kvm_arch_alloc_vm(void)
665 {
666         return kzalloc(sizeof(struct kvm), GFP_KERNEL);
667 }
668 
669 static inline void kvm_arch_free_vm(struct kvm *kvm)
670 {
671         kfree(kvm);
672 }
673 #endif
674 
675 #ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA
676 void kvm_arch_register_noncoherent_dma(struct kvm *kvm);
677 void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm);
678 bool kvm_arch_has_noncoherent_dma(struct kvm *kvm);
679 #else
680 static inline void kvm_arch_register_noncoherent_dma(struct kvm *kvm)
681 {
682 }
683 
684 static inline void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm)
685 {
686 }
687 
688 static inline bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
689 {
690         return false;
691 }
692 #endif
693 
694 static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
695 {
696 #ifdef __KVM_HAVE_ARCH_WQP
697         return vcpu->arch.wqp;
698 #else
699         return &vcpu->wq;
700 #endif
701 }
702 
703 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
704 void kvm_arch_destroy_vm(struct kvm *kvm);
705 void kvm_arch_sync_events(struct kvm *kvm);
706 
707 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
708 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
709 
710 bool kvm_is_reserved_pfn(pfn_t pfn);
711 
712 struct kvm_irq_ack_notifier {
713         struct hlist_node link;
714         unsigned gsi;
715         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
716 };
717 
718 int kvm_irq_map_gsi(struct kvm *kvm,
719                     struct kvm_kernel_irq_routing_entry *entries, int gsi);
720 int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin);
721 
722 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
723                 bool line_status);
724 int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level);
725 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
726                 int irq_source_id, int level, bool line_status);
727 bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);
728 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
729 void kvm_register_irq_ack_notifier(struct kvm *kvm,
730                                    struct kvm_irq_ack_notifier *kian);
731 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
732                                    struct kvm_irq_ack_notifier *kian);
733 int kvm_request_irq_source_id(struct kvm *kvm);
734 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
735 
736 #ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
737 int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
738 void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
739 #else
740 static inline int kvm_iommu_map_pages(struct kvm *kvm,
741                                       struct kvm_memory_slot *slot)
742 {
743         return 0;
744 }
745 
746 static inline void kvm_iommu_unmap_pages(struct kvm *kvm,
747                                          struct kvm_memory_slot *slot)
748 {
749 }
750 #endif
751 
752 static inline void kvm_guest_enter(void)
753 {
754         unsigned long flags;
755 
756         BUG_ON(preemptible());
757 
758         local_irq_save(flags);
759         guest_enter();
760         local_irq_restore(flags);
761 
762         /* KVM does not hold any references to rcu protected data when it
763          * switches CPU into a guest mode. In fact switching to a guest mode
764          * is very similar to exiting to userspace from rcu point of view. In
765          * addition CPU may stay in a guest mode for quite a long time (up to
766          * one time slice). Lets treat guest mode as quiescent state, just like
767          * we do with user-mode execution.
768          */
769         rcu_virt_note_context_switch(smp_processor_id());
770 }
771 
772 static inline void kvm_guest_exit(void)
773 {
774         unsigned long flags;
775 
776         local_irq_save(flags);
777         guest_exit();
778         local_irq_restore(flags);
779 }
780 
781 /*
782  * search_memslots() and __gfn_to_memslot() are here because they are
783  * used in non-modular code in arch/powerpc/kvm/book3s_hv_rm_mmu.c.
784  * gfn_to_memslot() itself isn't here as an inline because that would
785  * bloat other code too much.
786  */
787 static inline struct kvm_memory_slot *
788 search_memslots(struct kvm_memslots *slots, gfn_t gfn)
789 {
790         int start = 0, end = slots->used_slots;
791         int slot = atomic_read(&slots->lru_slot);
792         struct kvm_memory_slot *memslots = slots->memslots;
793 
794         if (gfn >= memslots[slot].base_gfn &&
795             gfn < memslots[slot].base_gfn + memslots[slot].npages)
796                 return &memslots[slot];
797 
798         while (start < end) {
799                 slot = start + (end - start) / 2;
800 
801                 if (gfn >= memslots[slot].base_gfn)
802                         end = slot;
803                 else
804                         start = slot + 1;
805         }
806 
807         if (gfn >= memslots[start].base_gfn &&
808             gfn < memslots[start].base_gfn + memslots[start].npages) {
809                 atomic_set(&slots->lru_slot, start);
810                 return &memslots[start];
811         }
812 
813         return NULL;
814 }
815 
816 static inline struct kvm_memory_slot *
817 __gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
818 {
819         return search_memslots(slots, gfn);
820 }
821 
822 static inline unsigned long
823 __gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
824 {
825         return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
826 }
827 
828 static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
829 {
830         return gfn_to_memslot(kvm, gfn)->id;
831 }
832 
833 static inline gfn_t
834 hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot)
835 {
836         gfn_t gfn_offset = (hva - slot->userspace_addr) >> PAGE_SHIFT;
837 
838         return slot->base_gfn + gfn_offset;
839 }
840 
841 static inline gpa_t gfn_to_gpa(gfn_t gfn)
842 {
843         return (gpa_t)gfn << PAGE_SHIFT;
844 }
845 
846 static inline gfn_t gpa_to_gfn(gpa_t gpa)
847 {
848         return (gfn_t)(gpa >> PAGE_SHIFT);
849 }
850 
851 static inline hpa_t pfn_to_hpa(pfn_t pfn)
852 {
853         return (hpa_t)pfn << PAGE_SHIFT;
854 }
855 
856 static inline bool kvm_is_error_gpa(struct kvm *kvm, gpa_t gpa)
857 {
858         unsigned long hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));
859 
860         return kvm_is_error_hva(hva);
861 }
862 
863 static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
864 {
865         set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
866 }
867 
868 enum kvm_stat_kind {
869         KVM_STAT_VM,
870         KVM_STAT_VCPU,
871 };
872 
873 struct kvm_stats_debugfs_item {
874         const char *name;
875         int offset;
876         enum kvm_stat_kind kind;
877         struct dentry *dentry;
878 };
879 extern struct kvm_stats_debugfs_item debugfs_entries[];
880 extern struct dentry *kvm_debugfs_dir;
881 
882 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
883 static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
884 {
885         if (unlikely(kvm->mmu_notifier_count))
886                 return 1;
887         /*
888          * Ensure the read of mmu_notifier_count happens before the read
889          * of mmu_notifier_seq.  This interacts with the smp_wmb() in
890          * mmu_notifier_invalidate_range_end to make sure that the caller
891          * either sees the old (non-zero) value of mmu_notifier_count or
892          * the new (incremented) value of mmu_notifier_seq.
893          * PowerPC Book3s HV KVM calls this under a per-page lock
894          * rather than under kvm->mmu_lock, for scalability, so
895          * can't rely on kvm->mmu_lock to keep things ordered.
896          */
897         smp_rmb();
898         if (kvm->mmu_notifier_seq != mmu_seq)
899                 return 1;
900         return 0;
901 }
902 #endif
903 
904 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
905 
906 #ifdef CONFIG_S390
907 #define KVM_MAX_IRQ_ROUTES 4096 //FIXME: we can have more than that...
908 #else
909 #define KVM_MAX_IRQ_ROUTES 1024
910 #endif
911 
912 int kvm_setup_default_irq_routing(struct kvm *kvm);
913 int kvm_set_irq_routing(struct kvm *kvm,
914                         const struct kvm_irq_routing_entry *entries,
915                         unsigned nr,
916                         unsigned flags);
917 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
918                           const struct kvm_irq_routing_entry *ue);
919 void kvm_free_irq_routing(struct kvm *kvm);
920 
921 #else
922 
923 static inline void kvm_free_irq_routing(struct kvm *kvm) {}
924 
925 #endif
926 
927 int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
928 
929 #ifdef CONFIG_HAVE_KVM_EVENTFD
930 
931 void kvm_eventfd_init(struct kvm *kvm);
932 int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
933 
934 #ifdef CONFIG_HAVE_KVM_IRQFD
935 int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args);
936 void kvm_irqfd_release(struct kvm *kvm);
937 void kvm_irq_routing_update(struct kvm *);
938 #else
939 static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
940 {
941         return -EINVAL;
942 }
943 
944 static inline void kvm_irqfd_release(struct kvm *kvm) {}
945 #endif
946 
947 #else
948 
949 static inline void kvm_eventfd_init(struct kvm *kvm) {}
950 
951 static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
952 {
953         return -EINVAL;
954 }
955 
956 static inline void kvm_irqfd_release(struct kvm *kvm) {}
957 
958 #ifdef CONFIG_HAVE_KVM_IRQCHIP
959 static inline void kvm_irq_routing_update(struct kvm *kvm)
960 {
961 }
962 #endif
963 
964 static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
965 {
966         return -ENOSYS;
967 }
968 
969 #endif /* CONFIG_HAVE_KVM_EVENTFD */
970 
971 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
972 static inline bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
973 {
974         return vcpu->kvm->bsp_vcpu_id == vcpu->vcpu_id;
975 }
976 
977 bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu);
978 
979 #else
980 
981 static inline bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) { return true; }
982 
983 #endif
984 
985 static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
986 {
987         set_bit(req, &vcpu->requests);
988 }
989 
990 static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
991 {
992         if (test_bit(req, &vcpu->requests)) {
993                 clear_bit(req, &vcpu->requests);
994                 return true;
995         } else {
996                 return false;
997         }
998 }
999 
1000 extern bool kvm_rebooting;
1001 
1002 struct kvm_device {
1003         struct kvm_device_ops *ops;
1004         struct kvm *kvm;
1005         void *private;
1006         struct list_head vm_node;
1007 };
1008 
1009 /* create, destroy, and name are mandatory */
1010 struct kvm_device_ops {
1011         const char *name;
1012         int (*create)(struct kvm_device *dev, u32 type);
1013 
1014         /*
1015          * Destroy is responsible for freeing dev.
1016          *
1017          * Destroy may be called before or after destructors are called
1018          * on emulated I/O regions, depending on whether a reference is
1019          * held by a vcpu or other kvm component that gets destroyed
1020          * after the emulated I/O.
1021          */
1022         void (*destroy)(struct kvm_device *dev);
1023 
1024         int (*set_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
1025         int (*get_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
1026         int (*has_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
1027         long (*ioctl)(struct kvm_device *dev, unsigned int ioctl,
1028                       unsigned long arg);
1029 };
1030 
1031 void kvm_device_get(struct kvm_device *dev);
1032 void kvm_device_put(struct kvm_device *dev);
1033 struct kvm_device *kvm_device_from_filp(struct file *filp);
1034 int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type);
1035 void kvm_unregister_device_ops(u32 type);
1036 
1037 extern struct kvm_device_ops kvm_mpic_ops;
1038 extern struct kvm_device_ops kvm_xics_ops;
1039 extern struct kvm_device_ops kvm_arm_vgic_v2_ops;
1040 extern struct kvm_device_ops kvm_arm_vgic_v3_ops;
1041 
1042 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1043 
1044 static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
1045 {
1046         vcpu->spin_loop.in_spin_loop = val;
1047 }
1048 static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
1049 {
1050         vcpu->spin_loop.dy_eligible = val;
1051 }
1052 
1053 #else /* !CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
1054 
1055 static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
1056 {
1057 }
1058 
1059 static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
1060 {
1061 }
1062 #endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
1063 #endif
1064 
1065 

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