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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 <linux/irqbypass.h>
 28 #include <linux/swait.h>
 29 #include <linux/refcount.h>
 30 #include <asm/signal.h>
 31 
 32 #include <linux/kvm.h>
 33 #include <linux/kvm_para.h>
 34 
 35 #include <linux/kvm_types.h>
 36 
 37 #include <asm/kvm_host.h>
 38 
 39 #ifndef KVM_MAX_VCPU_ID
 40 #define KVM_MAX_VCPU_ID KVM_MAX_VCPUS
 41 #endif
 42 
 43 /*
 44  * The bit 16 ~ bit 31 of kvm_memory_region::flags are internally used
 45  * in kvm, other bits are visible for userspace which are defined in
 46  * include/linux/kvm_h.
 47  */
 48 #define KVM_MEMSLOT_INVALID     (1UL << 16)
 49 
 50 /* Two fragments for cross MMIO pages. */
 51 #define KVM_MAX_MMIO_FRAGMENTS  2
 52 
 53 #ifndef KVM_ADDRESS_SPACE_NUM
 54 #define KVM_ADDRESS_SPACE_NUM   1
 55 #endif
 56 
 57 /*
 58  * For the normal pfn, the highest 12 bits should be zero,
 59  * so we can mask bit 62 ~ bit 52  to indicate the error pfn,
 60  * mask bit 63 to indicate the noslot pfn.
 61  */
 62 #define KVM_PFN_ERR_MASK        (0x7ffULL << 52)
 63 #define KVM_PFN_ERR_NOSLOT_MASK (0xfffULL << 52)
 64 #define KVM_PFN_NOSLOT          (0x1ULL << 63)
 65 
 66 #define KVM_PFN_ERR_FAULT       (KVM_PFN_ERR_MASK)
 67 #define KVM_PFN_ERR_HWPOISON    (KVM_PFN_ERR_MASK + 1)
 68 #define KVM_PFN_ERR_RO_FAULT    (KVM_PFN_ERR_MASK + 2)
 69 
 70 /*
 71  * error pfns indicate that the gfn is in slot but faild to
 72  * translate it to pfn on host.
 73  */
 74 static inline bool is_error_pfn(kvm_pfn_t pfn)
 75 {
 76         return !!(pfn & KVM_PFN_ERR_MASK);
 77 }
 78 
 79 /*
 80  * error_noslot pfns indicate that the gfn can not be
 81  * translated to pfn - it is not in slot or failed to
 82  * translate it to pfn.
 83  */
 84 static inline bool is_error_noslot_pfn(kvm_pfn_t pfn)
 85 {
 86         return !!(pfn & KVM_PFN_ERR_NOSLOT_MASK);
 87 }
 88 
 89 /* noslot pfn indicates that the gfn is not in slot. */
 90 static inline bool is_noslot_pfn(kvm_pfn_t pfn)
 91 {
 92         return pfn == KVM_PFN_NOSLOT;
 93 }
 94 
 95 /*
 96  * architectures with KVM_HVA_ERR_BAD other than PAGE_OFFSET (e.g. s390)
 97  * provide own defines and kvm_is_error_hva
 98  */
 99 #ifndef KVM_HVA_ERR_BAD
100 
101 #define KVM_HVA_ERR_BAD         (PAGE_OFFSET)
102 #define KVM_HVA_ERR_RO_BAD      (PAGE_OFFSET + PAGE_SIZE)
103 
104 static inline bool kvm_is_error_hva(unsigned long addr)
105 {
106         return addr >= PAGE_OFFSET;
107 }
108 
109 #endif
110 
111 #define KVM_ERR_PTR_BAD_PAGE    (ERR_PTR(-ENOENT))
112 
113 static inline bool is_error_page(struct page *page)
114 {
115         return IS_ERR(page);
116 }
117 
118 #define KVM_REQUEST_MASK           GENMASK(7,0)
119 #define KVM_REQUEST_NO_WAKEUP      BIT(8)
120 #define KVM_REQUEST_WAIT           BIT(9)
121 /*
122  * Architecture-independent vcpu->requests bit members
123  * Bits 4-7 are reserved for more arch-independent bits.
124  */
125 #define KVM_REQ_TLB_FLUSH         (0 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
126 #define KVM_REQ_MMU_RELOAD        (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
127 #define KVM_REQ_PENDING_TIMER     2
128 #define KVM_REQ_UNHALT            3
129 #define KVM_REQUEST_ARCH_BASE     8
130 
131 #define KVM_ARCH_REQ_FLAGS(nr, flags) ({ \
132         BUILD_BUG_ON((unsigned)(nr) >= 32 - KVM_REQUEST_ARCH_BASE); \
133         (unsigned)(((nr) + KVM_REQUEST_ARCH_BASE) | (flags)); \
134 })
135 #define KVM_ARCH_REQ(nr)           KVM_ARCH_REQ_FLAGS(nr, 0)
136 
137 #define KVM_USERSPACE_IRQ_SOURCE_ID             0
138 #define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID        1
139 
140 extern struct kmem_cache *kvm_vcpu_cache;
141 
142 extern spinlock_t kvm_lock;
143 extern struct list_head vm_list;
144 
145 struct kvm_io_range {
146         gpa_t addr;
147         int len;
148         struct kvm_io_device *dev;
149 };
150 
151 #define NR_IOBUS_DEVS 1000
152 
153 struct kvm_io_bus {
154         int dev_count;
155         int ioeventfd_count;
156         struct kvm_io_range range[];
157 };
158 
159 enum kvm_bus {
160         KVM_MMIO_BUS,
161         KVM_PIO_BUS,
162         KVM_VIRTIO_CCW_NOTIFY_BUS,
163         KVM_FAST_MMIO_BUS,
164         KVM_NR_BUSES
165 };
166 
167 int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
168                      int len, const void *val);
169 int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
170                             gpa_t addr, int len, const void *val, long cookie);
171 int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
172                     int len, void *val);
173 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
174                             int len, struct kvm_io_device *dev);
175 void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
176                                struct kvm_io_device *dev);
177 struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
178                                          gpa_t addr);
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         int pre_pcpu;
230         struct list_head blocked_vcpu_list;
231 
232         struct mutex mutex;
233         struct kvm_run *run;
234 
235         int guest_xcr0_loaded;
236         struct swait_queue_head wq;
237         struct pid __rcu *pid;
238         int sigset_active;
239         sigset_t sigset;
240         struct kvm_vcpu_stat stat;
241         unsigned int halt_poll_ns;
242         bool valid_wakeup;
243 
244 #ifdef CONFIG_HAS_IOMEM
245         int mmio_needed;
246         int mmio_read_completed;
247         int mmio_is_write;
248         int mmio_cur_fragment;
249         int mmio_nr_fragments;
250         struct kvm_mmio_fragment mmio_fragments[KVM_MAX_MMIO_FRAGMENTS];
251 #endif
252 
253 #ifdef CONFIG_KVM_ASYNC_PF
254         struct {
255                 u32 queued;
256                 struct list_head queue;
257                 struct list_head done;
258                 spinlock_t lock;
259         } async_pf;
260 #endif
261 
262 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
263         /*
264          * Cpu relax intercept or pause loop exit optimization
265          * in_spin_loop: set when a vcpu does a pause loop exit
266          *  or cpu relax intercepted.
267          * dy_eligible: indicates whether vcpu is eligible for directed yield.
268          */
269         struct {
270                 bool in_spin_loop;
271                 bool dy_eligible;
272         } spin_loop;
273 #endif
274         bool preempted;
275         struct kvm_vcpu_arch arch;
276         struct dentry *debugfs_dentry;
277 };
278 
279 static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
280 {
281         /*
282          * The memory barrier ensures a previous write to vcpu->requests cannot
283          * be reordered with the read of vcpu->mode.  It pairs with the general
284          * memory barrier following the write of vcpu->mode in VCPU RUN.
285          */
286         smp_mb__before_atomic();
287         return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
288 }
289 
290 /*
291  * Some of the bitops functions do not support too long bitmaps.
292  * This number must be determined not to exceed such limits.
293  */
294 #define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
295 
296 struct kvm_memory_slot {
297         gfn_t base_gfn;
298         unsigned long npages;
299         unsigned long *dirty_bitmap;
300         struct kvm_arch_memory_slot arch;
301         unsigned long userspace_addr;
302         u32 flags;
303         short id;
304 };
305 
306 static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
307 {
308         return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
309 }
310 
311 struct kvm_s390_adapter_int {
312         u64 ind_addr;
313         u64 summary_addr;
314         u64 ind_offset;
315         u32 summary_offset;
316         u32 adapter_id;
317 };
318 
319 struct kvm_hv_sint {
320         u32 vcpu;
321         u32 sint;
322 };
323 
324 struct kvm_kernel_irq_routing_entry {
325         u32 gsi;
326         u32 type;
327         int (*set)(struct kvm_kernel_irq_routing_entry *e,
328                    struct kvm *kvm, int irq_source_id, int level,
329                    bool line_status);
330         union {
331                 struct {
332                         unsigned irqchip;
333                         unsigned pin;
334                 } irqchip;
335                 struct {
336                         u32 address_lo;
337                         u32 address_hi;
338                         u32 data;
339                         u32 flags;
340                         u32 devid;
341                 } msi;
342                 struct kvm_s390_adapter_int adapter;
343                 struct kvm_hv_sint hv_sint;
344         };
345         struct hlist_node link;
346 };
347 
348 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
349 struct kvm_irq_routing_table {
350         int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS];
351         u32 nr_rt_entries;
352         /*
353          * Array indexed by gsi. Each entry contains list of irq chips
354          * the gsi is connected to.
355          */
356         struct hlist_head map[0];
357 };
358 #endif
359 
360 #ifndef KVM_PRIVATE_MEM_SLOTS
361 #define KVM_PRIVATE_MEM_SLOTS 0
362 #endif
363 
364 #ifndef KVM_MEM_SLOTS_NUM
365 #define KVM_MEM_SLOTS_NUM (KVM_USER_MEM_SLOTS + KVM_PRIVATE_MEM_SLOTS)
366 #endif
367 
368 #ifndef __KVM_VCPU_MULTIPLE_ADDRESS_SPACE
369 static inline int kvm_arch_vcpu_memslots_id(struct kvm_vcpu *vcpu)
370 {
371         return 0;
372 }
373 #endif
374 
375 /*
376  * Note:
377  * memslots are not sorted by id anymore, please use id_to_memslot()
378  * to get the memslot by its id.
379  */
380 struct kvm_memslots {
381         u64 generation;
382         struct kvm_memory_slot memslots[KVM_MEM_SLOTS_NUM];
383         /* The mapping table from slot id to the index in memslots[]. */
384         short id_to_index[KVM_MEM_SLOTS_NUM];
385         atomic_t lru_slot;
386         int used_slots;
387 };
388 
389 struct kvm {
390         spinlock_t mmu_lock;
391         struct mutex slots_lock;
392         struct mm_struct *mm; /* userspace tied to this vm */
393         struct kvm_memslots __rcu *memslots[KVM_ADDRESS_SPACE_NUM];
394         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
395 
396         /*
397          * created_vcpus is protected by kvm->lock, and is incremented
398          * at the beginning of KVM_CREATE_VCPU.  online_vcpus is only
399          * incremented after storing the kvm_vcpu pointer in vcpus,
400          * and is accessed atomically.
401          */
402         atomic_t online_vcpus;
403         int created_vcpus;
404         int last_boosted_vcpu;
405         struct list_head vm_list;
406         struct mutex lock;
407         struct kvm_io_bus __rcu *buses[KVM_NR_BUSES];
408 #ifdef CONFIG_HAVE_KVM_EVENTFD
409         struct {
410                 spinlock_t        lock;
411                 struct list_head  items;
412                 struct list_head  resampler_list;
413                 struct mutex      resampler_lock;
414         } irqfds;
415         struct list_head ioeventfds;
416 #endif
417         struct kvm_vm_stat stat;
418         struct kvm_arch arch;
419         refcount_t users_count;
420 #ifdef CONFIG_KVM_MMIO
421         struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
422         spinlock_t ring_lock;
423         struct list_head coalesced_zones;
424 #endif
425 
426         struct mutex irq_lock;
427 #ifdef CONFIG_HAVE_KVM_IRQCHIP
428         /*
429          * Update side is protected by irq_lock.
430          */
431         struct kvm_irq_routing_table __rcu *irq_routing;
432 #endif
433 #ifdef CONFIG_HAVE_KVM_IRQFD
434         struct hlist_head irq_ack_notifier_list;
435 #endif
436 
437 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
438         struct mmu_notifier mmu_notifier;
439         unsigned long mmu_notifier_seq;
440         long mmu_notifier_count;
441 #endif
442         long tlbs_dirty;
443         struct list_head devices;
444         struct dentry *debugfs_dentry;
445         struct kvm_stat_data **debugfs_stat_data;
446         struct srcu_struct srcu;
447         struct srcu_struct irq_srcu;
448         pid_t userspace_pid;
449 };
450 
451 #define kvm_err(fmt, ...) \
452         pr_err("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
453 #define kvm_info(fmt, ...) \
454         pr_info("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
455 #define kvm_debug(fmt, ...) \
456         pr_debug("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
457 #define kvm_debug_ratelimited(fmt, ...) \
458         pr_debug_ratelimited("kvm [%i]: " fmt, task_pid_nr(current), \
459                              ## __VA_ARGS__)
460 #define kvm_pr_unimpl(fmt, ...) \
461         pr_err_ratelimited("kvm [%i]: " fmt, \
462                            task_tgid_nr(current), ## __VA_ARGS__)
463 
464 /* The guest did something we don't support. */
465 #define vcpu_unimpl(vcpu, fmt, ...)                                     \
466         kvm_pr_unimpl("vcpu%i, guest rIP: 0x%lx " fmt,                  \
467                         (vcpu)->vcpu_id, kvm_rip_read(vcpu), ## __VA_ARGS__)
468 
469 #define vcpu_debug(vcpu, fmt, ...)                                      \
470         kvm_debug("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
471 #define vcpu_debug_ratelimited(vcpu, fmt, ...)                          \
472         kvm_debug_ratelimited("vcpu%i " fmt, (vcpu)->vcpu_id,           \
473                               ## __VA_ARGS__)
474 #define vcpu_err(vcpu, fmt, ...)                                        \
475         kvm_err("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
476 
477 static inline struct kvm_io_bus *kvm_get_bus(struct kvm *kvm, enum kvm_bus idx)
478 {
479         return srcu_dereference_check(kvm->buses[idx], &kvm->srcu,
480                                       lockdep_is_held(&kvm->slots_lock) ||
481                                       !refcount_read(&kvm->users_count));
482 }
483 
484 static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
485 {
486         /* Pairs with smp_wmb() in kvm_vm_ioctl_create_vcpu, in case
487          * the caller has read kvm->online_vcpus before (as is the case
488          * for kvm_for_each_vcpu, for example).
489          */
490         smp_rmb();
491         return kvm->vcpus[i];
492 }
493 
494 #define kvm_for_each_vcpu(idx, vcpup, kvm) \
495         for (idx = 0; \
496              idx < atomic_read(&kvm->online_vcpus) && \
497              (vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
498              idx++)
499 
500 static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id)
501 {
502         struct kvm_vcpu *vcpu = NULL;
503         int i;
504 
505         if (id < 0)
506                 return NULL;
507         if (id < KVM_MAX_VCPUS)
508                 vcpu = kvm_get_vcpu(kvm, id);
509         if (vcpu && vcpu->vcpu_id == id)
510                 return vcpu;
511         kvm_for_each_vcpu(i, vcpu, kvm)
512                 if (vcpu->vcpu_id == id)
513                         return vcpu;
514         return NULL;
515 }
516 
517 static inline int kvm_vcpu_get_idx(struct kvm_vcpu *vcpu)
518 {
519         struct kvm_vcpu *tmp;
520         int idx;
521 
522         kvm_for_each_vcpu(idx, tmp, vcpu->kvm)
523                 if (tmp == vcpu)
524                         return idx;
525         BUG();
526 }
527 
528 #define kvm_for_each_memslot(memslot, slots)    \
529         for (memslot = &slots->memslots[0];     \
530               memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\
531                 memslot++)
532 
533 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
534 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
535 
536 void vcpu_load(struct kvm_vcpu *vcpu);
537 void vcpu_put(struct kvm_vcpu *vcpu);
538 
539 #ifdef __KVM_HAVE_IOAPIC
540 void kvm_arch_post_irq_ack_notifier_list_update(struct kvm *kvm);
541 void kvm_arch_post_irq_routing_update(struct kvm *kvm);
542 #else
543 static inline void kvm_arch_post_irq_ack_notifier_list_update(struct kvm *kvm)
544 {
545 }
546 static inline void kvm_arch_post_irq_routing_update(struct kvm *kvm)
547 {
548 }
549 #endif
550 
551 #ifdef CONFIG_HAVE_KVM_IRQFD
552 int kvm_irqfd_init(void);
553 void kvm_irqfd_exit(void);
554 #else
555 static inline int kvm_irqfd_init(void)
556 {
557         return 0;
558 }
559 
560 static inline void kvm_irqfd_exit(void)
561 {
562 }
563 #endif
564 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
565                   struct module *module);
566 void kvm_exit(void);
567 
568 void kvm_get_kvm(struct kvm *kvm);
569 void kvm_put_kvm(struct kvm *kvm);
570 
571 static inline struct kvm_memslots *__kvm_memslots(struct kvm *kvm, int as_id)
572 {
573         return srcu_dereference_check(kvm->memslots[as_id], &kvm->srcu,
574                         lockdep_is_held(&kvm->slots_lock) ||
575                         !refcount_read(&kvm->users_count));
576 }
577 
578 static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
579 {
580         return __kvm_memslots(kvm, 0);
581 }
582 
583 static inline struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu)
584 {
585         int as_id = kvm_arch_vcpu_memslots_id(vcpu);
586 
587         return __kvm_memslots(vcpu->kvm, as_id);
588 }
589 
590 static inline struct kvm_memory_slot *
591 id_to_memslot(struct kvm_memslots *slots, int id)
592 {
593         int index = slots->id_to_index[id];
594         struct kvm_memory_slot *slot;
595 
596         slot = &slots->memslots[index];
597 
598         WARN_ON(slot->id != id);
599         return slot;
600 }
601 
602 /*
603  * KVM_SET_USER_MEMORY_REGION ioctl allows the following operations:
604  * - create a new memory slot
605  * - delete an existing memory slot
606  * - modify an existing memory slot
607  *   -- move it in the guest physical memory space
608  *   -- just change its flags
609  *
610  * Since flags can be changed by some of these operations, the following
611  * differentiation is the best we can do for __kvm_set_memory_region():
612  */
613 enum kvm_mr_change {
614         KVM_MR_CREATE,
615         KVM_MR_DELETE,
616         KVM_MR_MOVE,
617         KVM_MR_FLAGS_ONLY,
618 };
619 
620 int kvm_set_memory_region(struct kvm *kvm,
621                           const struct kvm_userspace_memory_region *mem);
622 int __kvm_set_memory_region(struct kvm *kvm,
623                             const struct kvm_userspace_memory_region *mem);
624 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
625                            struct kvm_memory_slot *dont);
626 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
627                             unsigned long npages);
628 void kvm_arch_memslots_updated(struct kvm *kvm, struct kvm_memslots *slots);
629 int kvm_arch_prepare_memory_region(struct kvm *kvm,
630                                 struct kvm_memory_slot *memslot,
631                                 const struct kvm_userspace_memory_region *mem,
632                                 enum kvm_mr_change change);
633 void kvm_arch_commit_memory_region(struct kvm *kvm,
634                                 const struct kvm_userspace_memory_region *mem,
635                                 const struct kvm_memory_slot *old,
636                                 const struct kvm_memory_slot *new,
637                                 enum kvm_mr_change change);
638 bool kvm_largepages_enabled(void);
639 void kvm_disable_largepages(void);
640 /* flush all memory translations */
641 void kvm_arch_flush_shadow_all(struct kvm *kvm);
642 /* flush memory translations pointing to 'slot' */
643 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
644                                    struct kvm_memory_slot *slot);
645 
646 int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
647                             struct page **pages, int nr_pages);
648 
649 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
650 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
651 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable);
652 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
653 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, gfn_t gfn,
654                                       bool *writable);
655 void kvm_release_page_clean(struct page *page);
656 void kvm_release_page_dirty(struct page *page);
657 void kvm_set_page_accessed(struct page *page);
658 
659 kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn);
660 kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
661 kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
662                       bool *writable);
663 kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
664 kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn);
665 kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
666                                bool atomic, bool *async, bool write_fault,
667                                bool *writable);
668 
669 void kvm_release_pfn_clean(kvm_pfn_t pfn);
670 void kvm_release_pfn_dirty(kvm_pfn_t pfn);
671 void kvm_set_pfn_dirty(kvm_pfn_t pfn);
672 void kvm_set_pfn_accessed(kvm_pfn_t pfn);
673 void kvm_get_pfn(kvm_pfn_t pfn);
674 
675 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
676                         int len);
677 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
678                           unsigned long len);
679 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
680 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
681                            void *data, unsigned long len);
682 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
683                          int offset, int len);
684 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
685                     unsigned long len);
686 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
687                            void *data, unsigned long len);
688 int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
689                            void *data, int offset, unsigned long len);
690 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
691                               gpa_t gpa, unsigned long len);
692 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
693 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
694 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
695 bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
696 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
697 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
698 
699 struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu);
700 struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn);
701 kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn);
702 kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn);
703 struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn);
704 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn);
705 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable);
706 int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, int offset,
707                              int len);
708 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, void *data,
709                                unsigned long len);
710 int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data,
711                         unsigned long len);
712 int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, const void *data,
713                               int offset, int len);
714 int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
715                          unsigned long len);
716 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn);
717 
718 void kvm_sigset_activate(struct kvm_vcpu *vcpu);
719 void kvm_sigset_deactivate(struct kvm_vcpu *vcpu);
720 
721 void kvm_vcpu_block(struct kvm_vcpu *vcpu);
722 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu);
723 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu);
724 bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu);
725 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
726 int kvm_vcpu_yield_to(struct kvm_vcpu *target);
727 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu, bool usermode_vcpu_not_eligible);
728 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
729 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
730 
731 void kvm_flush_remote_tlbs(struct kvm *kvm);
732 void kvm_reload_remote_mmus(struct kvm *kvm);
733 bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);
734 
735 long kvm_arch_dev_ioctl(struct file *filp,
736                         unsigned int ioctl, unsigned long arg);
737 long kvm_arch_vcpu_ioctl(struct file *filp,
738                          unsigned int ioctl, unsigned long arg);
739 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);
740 
741 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext);
742 
743 int kvm_get_dirty_log(struct kvm *kvm,
744                         struct kvm_dirty_log *log, int *is_dirty);
745 
746 int kvm_get_dirty_log_protect(struct kvm *kvm,
747                         struct kvm_dirty_log *log, bool *is_dirty);
748 
749 void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
750                                         struct kvm_memory_slot *slot,
751                                         gfn_t gfn_offset,
752                                         unsigned long mask);
753 
754 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
755                                 struct kvm_dirty_log *log);
756 
757 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
758                         bool line_status);
759 long kvm_arch_vm_ioctl(struct file *filp,
760                        unsigned int ioctl, unsigned long arg);
761 
762 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
763 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
764 
765 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
766                                     struct kvm_translation *tr);
767 
768 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
769 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
770 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
771                                   struct kvm_sregs *sregs);
772 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
773                                   struct kvm_sregs *sregs);
774 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
775                                     struct kvm_mp_state *mp_state);
776 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
777                                     struct kvm_mp_state *mp_state);
778 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
779                                         struct kvm_guest_debug *dbg);
780 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
781 
782 int kvm_arch_init(void *opaque);
783 void kvm_arch_exit(void);
784 
785 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
786 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
787 
788 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu);
789 
790 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
791 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
792 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
793 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
794 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
795 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);
796 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
797 
798 bool kvm_arch_has_vcpu_debugfs(void);
799 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu);
800 
801 int kvm_arch_hardware_enable(void);
802 void kvm_arch_hardware_disable(void);
803 int kvm_arch_hardware_setup(void);
804 void kvm_arch_hardware_unsetup(void);
805 void kvm_arch_check_processor_compat(void *rtn);
806 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
807 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu);
808 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
809 
810 #ifndef __KVM_HAVE_ARCH_VM_ALLOC
811 static inline struct kvm *kvm_arch_alloc_vm(void)
812 {
813         return kzalloc(sizeof(struct kvm), GFP_KERNEL);
814 }
815 
816 static inline void kvm_arch_free_vm(struct kvm *kvm)
817 {
818         kfree(kvm);
819 }
820 #endif
821 
822 #ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA
823 void kvm_arch_register_noncoherent_dma(struct kvm *kvm);
824 void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm);
825 bool kvm_arch_has_noncoherent_dma(struct kvm *kvm);
826 #else
827 static inline void kvm_arch_register_noncoherent_dma(struct kvm *kvm)
828 {
829 }
830 
831 static inline void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm)
832 {
833 }
834 
835 static inline bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
836 {
837         return false;
838 }
839 #endif
840 #ifdef __KVM_HAVE_ARCH_ASSIGNED_DEVICE
841 void kvm_arch_start_assignment(struct kvm *kvm);
842 void kvm_arch_end_assignment(struct kvm *kvm);
843 bool kvm_arch_has_assigned_device(struct kvm *kvm);
844 #else
845 static inline void kvm_arch_start_assignment(struct kvm *kvm)
846 {
847 }
848 
849 static inline void kvm_arch_end_assignment(struct kvm *kvm)
850 {
851 }
852 
853 static inline bool kvm_arch_has_assigned_device(struct kvm *kvm)
854 {
855         return false;
856 }
857 #endif
858 
859 static inline struct swait_queue_head *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
860 {
861 #ifdef __KVM_HAVE_ARCH_WQP
862         return vcpu->arch.wqp;
863 #else
864         return &vcpu->wq;
865 #endif
866 }
867 
868 #ifdef __KVM_HAVE_ARCH_INTC_INITIALIZED
869 /*
870  * returns true if the virtual interrupt controller is initialized and
871  * ready to accept virtual IRQ. On some architectures the virtual interrupt
872  * controller is dynamically instantiated and this is not always true.
873  */
874 bool kvm_arch_intc_initialized(struct kvm *kvm);
875 #else
876 static inline bool kvm_arch_intc_initialized(struct kvm *kvm)
877 {
878         return true;
879 }
880 #endif
881 
882 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
883 void kvm_arch_destroy_vm(struct kvm *kvm);
884 void kvm_arch_sync_events(struct kvm *kvm);
885 
886 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
887 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
888 
889 bool kvm_is_reserved_pfn(kvm_pfn_t pfn);
890 
891 struct kvm_irq_ack_notifier {
892         struct hlist_node link;
893         unsigned gsi;
894         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
895 };
896 
897 int kvm_irq_map_gsi(struct kvm *kvm,
898                     struct kvm_kernel_irq_routing_entry *entries, int gsi);
899 int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin);
900 
901 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
902                 bool line_status);
903 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
904                 int irq_source_id, int level, bool line_status);
905 int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
906                                struct kvm *kvm, int irq_source_id,
907                                int level, bool line_status);
908 bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);
909 void kvm_notify_acked_gsi(struct kvm *kvm, int gsi);
910 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
911 void kvm_register_irq_ack_notifier(struct kvm *kvm,
912                                    struct kvm_irq_ack_notifier *kian);
913 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
914                                    struct kvm_irq_ack_notifier *kian);
915 int kvm_request_irq_source_id(struct kvm *kvm);
916 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
917 
918 /*
919  * search_memslots() and __gfn_to_memslot() are here because they are
920  * used in non-modular code in arch/powerpc/kvm/book3s_hv_rm_mmu.c.
921  * gfn_to_memslot() itself isn't here as an inline because that would
922  * bloat other code too much.
923  */
924 static inline struct kvm_memory_slot *
925 search_memslots(struct kvm_memslots *slots, gfn_t gfn)
926 {
927         int start = 0, end = slots->used_slots;
928         int slot = atomic_read(&slots->lru_slot);
929         struct kvm_memory_slot *memslots = slots->memslots;
930 
931         if (gfn >= memslots[slot].base_gfn &&
932             gfn < memslots[slot].base_gfn + memslots[slot].npages)
933                 return &memslots[slot];
934 
935         while (start < end) {
936                 slot = start + (end - start) / 2;
937 
938                 if (gfn >= memslots[slot].base_gfn)
939                         end = slot;
940                 else
941                         start = slot + 1;
942         }
943 
944         if (gfn >= memslots[start].base_gfn &&
945             gfn < memslots[start].base_gfn + memslots[start].npages) {
946                 atomic_set(&slots->lru_slot, start);
947                 return &memslots[start];
948         }
949 
950         return NULL;
951 }
952 
953 static inline struct kvm_memory_slot *
954 __gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
955 {
956         return search_memslots(slots, gfn);
957 }
958 
959 static inline unsigned long
960 __gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
961 {
962         return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
963 }
964 
965 static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
966 {
967         return gfn_to_memslot(kvm, gfn)->id;
968 }
969 
970 static inline gfn_t
971 hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot)
972 {
973         gfn_t gfn_offset = (hva - slot->userspace_addr) >> PAGE_SHIFT;
974 
975         return slot->base_gfn + gfn_offset;
976 }
977 
978 static inline gpa_t gfn_to_gpa(gfn_t gfn)
979 {
980         return (gpa_t)gfn << PAGE_SHIFT;
981 }
982 
983 static inline gfn_t gpa_to_gfn(gpa_t gpa)
984 {
985         return (gfn_t)(gpa >> PAGE_SHIFT);
986 }
987 
988 static inline hpa_t pfn_to_hpa(kvm_pfn_t pfn)
989 {
990         return (hpa_t)pfn << PAGE_SHIFT;
991 }
992 
993 static inline struct page *kvm_vcpu_gpa_to_page(struct kvm_vcpu *vcpu,
994                                                 gpa_t gpa)
995 {
996         return kvm_vcpu_gfn_to_page(vcpu, gpa_to_gfn(gpa));
997 }
998 
999 static inline bool kvm_is_error_gpa(struct kvm *kvm, gpa_t gpa)
1000 {
1001         unsigned long hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));
1002 
1003         return kvm_is_error_hva(hva);
1004 }
1005 
1006 enum kvm_stat_kind {
1007         KVM_STAT_VM,
1008         KVM_STAT_VCPU,
1009 };
1010 
1011 struct kvm_stat_data {
1012         int offset;
1013         struct kvm *kvm;
1014 };
1015 
1016 struct kvm_stats_debugfs_item {
1017         const char *name;
1018         int offset;
1019         enum kvm_stat_kind kind;
1020 };
1021 extern struct kvm_stats_debugfs_item debugfs_entries[];
1022 extern struct dentry *kvm_debugfs_dir;
1023 
1024 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
1025 static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
1026 {
1027         if (unlikely(kvm->mmu_notifier_count))
1028                 return 1;
1029         /*
1030          * Ensure the read of mmu_notifier_count happens before the read
1031          * of mmu_notifier_seq.  This interacts with the smp_wmb() in
1032          * mmu_notifier_invalidate_range_end to make sure that the caller
1033          * either sees the old (non-zero) value of mmu_notifier_count or
1034          * the new (incremented) value of mmu_notifier_seq.
1035          * PowerPC Book3s HV KVM calls this under a per-page lock
1036          * rather than under kvm->mmu_lock, for scalability, so
1037          * can't rely on kvm->mmu_lock to keep things ordered.
1038          */
1039         smp_rmb();
1040         if (kvm->mmu_notifier_seq != mmu_seq)
1041                 return 1;
1042         return 0;
1043 }
1044 #endif
1045 
1046 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
1047 
1048 #define KVM_MAX_IRQ_ROUTES 4096 /* might need extension/rework in the future */
1049 
1050 bool kvm_arch_can_set_irq_routing(struct kvm *kvm);
1051 int kvm_set_irq_routing(struct kvm *kvm,
1052                         const struct kvm_irq_routing_entry *entries,
1053                         unsigned nr,
1054                         unsigned flags);
1055 int kvm_set_routing_entry(struct kvm *kvm,
1056                           struct kvm_kernel_irq_routing_entry *e,
1057                           const struct kvm_irq_routing_entry *ue);
1058 void kvm_free_irq_routing(struct kvm *kvm);
1059 
1060 #else
1061 
1062 static inline void kvm_free_irq_routing(struct kvm *kvm) {}
1063 
1064 #endif
1065 
1066 int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
1067 
1068 #ifdef CONFIG_HAVE_KVM_EVENTFD
1069 
1070 void kvm_eventfd_init(struct kvm *kvm);
1071 int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
1072 
1073 #ifdef CONFIG_HAVE_KVM_IRQFD
1074 int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args);
1075 void kvm_irqfd_release(struct kvm *kvm);
1076 void kvm_irq_routing_update(struct kvm *);
1077 #else
1078 static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
1079 {
1080         return -EINVAL;
1081 }
1082 
1083 static inline void kvm_irqfd_release(struct kvm *kvm) {}
1084 #endif
1085 
1086 #else
1087 
1088 static inline void kvm_eventfd_init(struct kvm *kvm) {}
1089 
1090 static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
1091 {
1092         return -EINVAL;
1093 }
1094 
1095 static inline void kvm_irqfd_release(struct kvm *kvm) {}
1096 
1097 #ifdef CONFIG_HAVE_KVM_IRQCHIP
1098 static inline void kvm_irq_routing_update(struct kvm *kvm)
1099 {
1100 }
1101 #endif
1102 
1103 static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
1104 {
1105         return -ENOSYS;
1106 }
1107 
1108 #endif /* CONFIG_HAVE_KVM_EVENTFD */
1109 
1110 void kvm_arch_irq_routing_update(struct kvm *kvm);
1111 
1112 static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
1113 {
1114         /*
1115          * Ensure the rest of the request is published to kvm_check_request's
1116          * caller.  Paired with the smp_mb__after_atomic in kvm_check_request.
1117          */
1118         smp_wmb();
1119         set_bit(req & KVM_REQUEST_MASK, &vcpu->requests);
1120 }
1121 
1122 static inline bool kvm_request_pending(struct kvm_vcpu *vcpu)
1123 {
1124         return READ_ONCE(vcpu->requests);
1125 }
1126 
1127 static inline bool kvm_test_request(int req, struct kvm_vcpu *vcpu)
1128 {
1129         return test_bit(req & KVM_REQUEST_MASK, &vcpu->requests);
1130 }
1131 
1132 static inline void kvm_clear_request(int req, struct kvm_vcpu *vcpu)
1133 {
1134         clear_bit(req & KVM_REQUEST_MASK, &vcpu->requests);
1135 }
1136 
1137 static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
1138 {
1139         if (kvm_test_request(req, vcpu)) {
1140                 kvm_clear_request(req, vcpu);
1141 
1142                 /*
1143                  * Ensure the rest of the request is visible to kvm_check_request's
1144                  * caller.  Paired with the smp_wmb in kvm_make_request.
1145                  */
1146                 smp_mb__after_atomic();
1147                 return true;
1148         } else {
1149                 return false;
1150         }
1151 }
1152 
1153 extern bool kvm_rebooting;
1154 
1155 extern unsigned int halt_poll_ns;
1156 extern unsigned int halt_poll_ns_grow;
1157 extern unsigned int halt_poll_ns_shrink;
1158 
1159 struct kvm_device {
1160         struct kvm_device_ops *ops;
1161         struct kvm *kvm;
1162         void *private;
1163         struct list_head vm_node;
1164 };
1165 
1166 /* create, destroy, and name are mandatory */
1167 struct kvm_device_ops {
1168         const char *name;
1169 
1170         /*
1171          * create is called holding kvm->lock and any operations not suitable
1172          * to do while holding the lock should be deferred to init (see
1173          * below).
1174          */
1175         int (*create)(struct kvm_device *dev, u32 type);
1176 
1177         /*
1178          * init is called after create if create is successful and is called
1179          * outside of holding kvm->lock.
1180          */
1181         void (*init)(struct kvm_device *dev);
1182 
1183         /*
1184          * Destroy is responsible for freeing dev.
1185          *
1186          * Destroy may be called before or after destructors are called
1187          * on emulated I/O regions, depending on whether a reference is
1188          * held by a vcpu or other kvm component that gets destroyed
1189          * after the emulated I/O.
1190          */
1191         void (*destroy)(struct kvm_device *dev);
1192 
1193         int (*set_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
1194         int (*get_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
1195         int (*has_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
1196         long (*ioctl)(struct kvm_device *dev, unsigned int ioctl,
1197                       unsigned long arg);
1198 };
1199 
1200 void kvm_device_get(struct kvm_device *dev);
1201 void kvm_device_put(struct kvm_device *dev);
1202 struct kvm_device *kvm_device_from_filp(struct file *filp);
1203 int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type);
1204 void kvm_unregister_device_ops(u32 type);
1205 
1206 extern struct kvm_device_ops kvm_mpic_ops;
1207 extern struct kvm_device_ops kvm_arm_vgic_v2_ops;
1208 extern struct kvm_device_ops kvm_arm_vgic_v3_ops;
1209 
1210 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1211 
1212 static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
1213 {
1214         vcpu->spin_loop.in_spin_loop = val;
1215 }
1216 static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
1217 {
1218         vcpu->spin_loop.dy_eligible = val;
1219 }
1220 
1221 #else /* !CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
1222 
1223 static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
1224 {
1225 }
1226 
1227 static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
1228 {
1229 }
1230 #endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
1231 
1232 #ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
1233 bool kvm_arch_has_irq_bypass(void);
1234 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *,
1235                            struct irq_bypass_producer *);
1236 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *,
1237                            struct irq_bypass_producer *);
1238 void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *);
1239 void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *);
1240 int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq,
1241                                   uint32_t guest_irq, bool set);
1242 #endif /* CONFIG_HAVE_KVM_IRQ_BYPASS */
1243 
1244 #ifdef CONFIG_HAVE_KVM_INVALID_WAKEUPS
1245 /* If we wakeup during the poll time, was it a sucessful poll? */
1246 static inline bool vcpu_valid_wakeup(struct kvm_vcpu *vcpu)
1247 {
1248         return vcpu->valid_wakeup;
1249 }
1250 
1251 #else
1252 static inline bool vcpu_valid_wakeup(struct kvm_vcpu *vcpu)
1253 {
1254         return true;
1255 }
1256 #endif /* CONFIG_HAVE_KVM_INVALID_WAKEUPS */
1257 
1258 #ifdef CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL
1259 long kvm_arch_vcpu_async_ioctl(struct file *filp,
1260                                unsigned int ioctl, unsigned long arg);
1261 #else
1262 static inline long kvm_arch_vcpu_async_ioctl(struct file *filp,
1263                                              unsigned int ioctl,
1264                                              unsigned long arg)
1265 {
1266         return -ENOIOCTLCMD;
1267 }
1268 #endif /* CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL */
1269 
1270 void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
1271                 unsigned long start, unsigned long end);
1272 
1273 #endif
1274 

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