5 * This work is licensed under the terms of the GNU GPL, version 2. See
6 * the COPYING file in the top-level directory.
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>
18 #include <linux/mmu_notifier.h>
19 #include <linux/preempt.h>
20 #include <linux/msi.h>
21 #include <linux/slab.h>
22 #include <linux/vmalloc.h>
23 #include <linux/rcupdate.h>
24 #include <linux/ratelimit.h>
25 #include <linux/err.h>
26 #include <linux/irqflags.h>
27 #include <linux/context_tracking.h>
28 #include <linux/irqbypass.h>
29 #include <linux/swait.h>
30 #include <linux/refcount.h>
31 #include <asm/signal.h>
33 #include <linux/kvm.h>
34 #include <linux/kvm_para.h>
36 #include <linux/kvm_types.h>
38 #include <asm/kvm_host.h>
40 #ifndef KVM_MAX_VCPU_ID
41 #define KVM_MAX_VCPU_ID KVM_MAX_VCPUS
45 * The bit 16 ~ bit 31 of kvm_memory_region::flags are internally used
46 * in kvm, other bits are visible for userspace which are defined in
47 * include/linux/kvm_h.
49 #define KVM_MEMSLOT_INVALID (1UL << 16)
52 * Bit 63 of the memslot generation number is an "update in-progress flag",
53 * e.g. is temporarily set for the duration of install_new_memslots().
54 * This flag effectively creates a unique generation number that is used to
55 * mark cached memslot data, e.g. MMIO accesses, as potentially being stale,
56 * i.e. may (or may not) have come from the previous memslots generation.
58 * This is necessary because the actual memslots update is not atomic with
59 * respect to the generation number update. Updating the generation number
60 * first would allow a vCPU to cache a spte from the old memslots using the
61 * new generation number, and updating the generation number after switching
62 * to the new memslots would allow cache hits using the old generation number
63 * to reference the defunct memslots.
65 * This mechanism is used to prevent getting hits in KVM's caches while a
66 * memslot update is in-progress, and to prevent cache hits *after* updating
67 * the actual generation number against accesses that were inserted into the
68 * cache *before* the memslots were updated.
70 #define KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS BIT_ULL(63)
72 /* Two fragments for cross MMIO pages. */
73 #define KVM_MAX_MMIO_FRAGMENTS 2
75 #ifndef KVM_ADDRESS_SPACE_NUM
76 #define KVM_ADDRESS_SPACE_NUM 1
80 * For the normal pfn, the highest 12 bits should be zero,
81 * so we can mask bit 62 ~ bit 52 to indicate the error pfn,
82 * mask bit 63 to indicate the noslot pfn.
84 #define KVM_PFN_ERR_MASK (0x7ffULL << 52)
85 #define KVM_PFN_ERR_NOSLOT_MASK (0xfffULL << 52)
86 #define KVM_PFN_NOSLOT (0x1ULL << 63)
88 #define KVM_PFN_ERR_FAULT (KVM_PFN_ERR_MASK)
89 #define KVM_PFN_ERR_HWPOISON (KVM_PFN_ERR_MASK + 1)
90 #define KVM_PFN_ERR_RO_FAULT (KVM_PFN_ERR_MASK + 2)
93 * error pfns indicate that the gfn is in slot but faild to
94 * translate it to pfn on host.
96 static inline bool is_error_pfn(kvm_pfn_t pfn)
98 return !!(pfn & KVM_PFN_ERR_MASK);
102 * error_noslot pfns indicate that the gfn can not be
103 * translated to pfn - it is not in slot or failed to
104 * translate it to pfn.
106 static inline bool is_error_noslot_pfn(kvm_pfn_t pfn)
108 return !!(pfn & KVM_PFN_ERR_NOSLOT_MASK);
111 /* noslot pfn indicates that the gfn is not in slot. */
112 static inline bool is_noslot_pfn(kvm_pfn_t pfn)
114 return pfn == KVM_PFN_NOSLOT;
118 * architectures with KVM_HVA_ERR_BAD other than PAGE_OFFSET (e.g. s390)
119 * provide own defines and kvm_is_error_hva
121 #ifndef KVM_HVA_ERR_BAD
123 #define KVM_HVA_ERR_BAD (PAGE_OFFSET)
124 #define KVM_HVA_ERR_RO_BAD (PAGE_OFFSET + PAGE_SIZE)
126 static inline bool kvm_is_error_hva(unsigned long addr)
128 return addr >= PAGE_OFFSET;
133 #define KVM_ERR_PTR_BAD_PAGE (ERR_PTR(-ENOENT))
135 static inline bool is_error_page(struct page *page)
140 #define KVM_REQUEST_MASK GENMASK(7,0)
141 #define KVM_REQUEST_NO_WAKEUP BIT(8)
142 #define KVM_REQUEST_WAIT BIT(9)
144 * Architecture-independent vcpu->requests bit members
145 * Bits 4-7 are reserved for more arch-independent bits.
147 #define KVM_REQ_TLB_FLUSH (0 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
148 #define KVM_REQ_MMU_RELOAD (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
149 #define KVM_REQ_PENDING_TIMER 2
150 #define KVM_REQ_UNHALT 3
151 #define KVM_REQUEST_ARCH_BASE 8
153 #define KVM_ARCH_REQ_FLAGS(nr, flags) ({ \
154 BUILD_BUG_ON((unsigned)(nr) >= (FIELD_SIZEOF(struct kvm_vcpu, requests) * 8) - KVM_REQUEST_ARCH_BASE); \
155 (unsigned)(((nr) + KVM_REQUEST_ARCH_BASE) | (flags)); \
157 #define KVM_ARCH_REQ(nr) KVM_ARCH_REQ_FLAGS(nr, 0)
159 #define KVM_USERSPACE_IRQ_SOURCE_ID 0
160 #define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID 1
162 extern struct kmem_cache *kvm_vcpu_cache;
164 extern spinlock_t kvm_lock;
165 extern struct list_head vm_list;
167 struct kvm_io_range {
170 struct kvm_io_device *dev;
173 #define NR_IOBUS_DEVS 1000
178 struct kvm_io_range range[];
184 KVM_VIRTIO_CCW_NOTIFY_BUS,
189 int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
190 int len, const void *val);
191 int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
192 gpa_t addr, int len, const void *val, long cookie);
193 int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
195 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
196 int len, struct kvm_io_device *dev);
197 void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
198 struct kvm_io_device *dev);
199 struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
202 #ifdef CONFIG_KVM_ASYNC_PF
203 struct kvm_async_pf {
204 struct work_struct work;
205 struct list_head link;
206 struct list_head queue;
207 struct kvm_vcpu *vcpu;
208 struct mm_struct *mm;
211 struct kvm_arch_async_pf arch;
215 void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);
216 void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu);
217 int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, unsigned long hva,
218 struct kvm_arch_async_pf *arch);
219 int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
226 READING_SHADOW_PAGE_TABLES,
230 * Sometimes a large or cross-page mmio needs to be broken up into separate
231 * exits for userspace servicing.
233 struct kvm_mmio_fragment {
241 #ifdef CONFIG_PREEMPT_NOTIFIERS
242 struct preempt_notifier preempt_notifier;
249 unsigned long guest_debug;
252 struct list_head blocked_vcpu_list;
257 int guest_xcr0_loaded;
258 struct swait_queue_head wq;
259 struct pid __rcu *pid;
262 struct kvm_vcpu_stat stat;
263 unsigned int halt_poll_ns;
266 #ifdef CONFIG_HAS_IOMEM
268 int mmio_read_completed;
270 int mmio_cur_fragment;
271 int mmio_nr_fragments;
272 struct kvm_mmio_fragment mmio_fragments[KVM_MAX_MMIO_FRAGMENTS];
275 #ifdef CONFIG_KVM_ASYNC_PF
278 struct list_head queue;
279 struct list_head done;
284 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
286 * Cpu relax intercept or pause loop exit optimization
287 * in_spin_loop: set when a vcpu does a pause loop exit
288 * or cpu relax intercepted.
289 * dy_eligible: indicates whether vcpu is eligible for directed yield.
297 struct kvm_vcpu_arch arch;
298 struct dentry *debugfs_dentry;
301 static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
304 * The memory barrier ensures a previous write to vcpu->requests cannot
305 * be reordered with the read of vcpu->mode. It pairs with the general
306 * memory barrier following the write of vcpu->mode in VCPU RUN.
308 smp_mb__before_atomic();
309 return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
313 * Some of the bitops functions do not support too long bitmaps.
314 * This number must be determined not to exceed such limits.
316 #define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
318 struct kvm_memory_slot {
320 unsigned long npages;
321 unsigned long *dirty_bitmap;
322 struct kvm_arch_memory_slot arch;
323 unsigned long userspace_addr;
328 static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
330 return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
333 static inline unsigned long *kvm_second_dirty_bitmap(struct kvm_memory_slot *memslot)
335 unsigned long len = kvm_dirty_bitmap_bytes(memslot);
337 return memslot->dirty_bitmap + len / sizeof(*memslot->dirty_bitmap);
340 struct kvm_s390_adapter_int {
353 struct kvm_kernel_irq_routing_entry {
356 int (*set)(struct kvm_kernel_irq_routing_entry *e,
357 struct kvm *kvm, int irq_source_id, int level,
371 struct kvm_s390_adapter_int adapter;
372 struct kvm_hv_sint hv_sint;
374 struct hlist_node link;
377 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
378 struct kvm_irq_routing_table {
379 int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS];
382 * Array indexed by gsi. Each entry contains list of irq chips
383 * the gsi is connected to.
385 struct hlist_head map[0];
389 #ifndef KVM_PRIVATE_MEM_SLOTS
390 #define KVM_PRIVATE_MEM_SLOTS 0
393 #ifndef KVM_MEM_SLOTS_NUM
394 #define KVM_MEM_SLOTS_NUM (KVM_USER_MEM_SLOTS + KVM_PRIVATE_MEM_SLOTS)
397 #ifndef __KVM_VCPU_MULTIPLE_ADDRESS_SPACE
398 static inline int kvm_arch_vcpu_memslots_id(struct kvm_vcpu *vcpu)
406 * memslots are not sorted by id anymore, please use id_to_memslot()
407 * to get the memslot by its id.
409 struct kvm_memslots {
411 struct kvm_memory_slot memslots[KVM_MEM_SLOTS_NUM];
412 /* The mapping table from slot id to the index in memslots[]. */
413 short id_to_index[KVM_MEM_SLOTS_NUM];
420 struct mutex slots_lock;
421 struct mm_struct *mm; /* userspace tied to this vm */
422 struct kvm_memslots __rcu *memslots[KVM_ADDRESS_SPACE_NUM];
423 struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
426 * created_vcpus is protected by kvm->lock, and is incremented
427 * at the beginning of KVM_CREATE_VCPU. online_vcpus is only
428 * incremented after storing the kvm_vcpu pointer in vcpus,
429 * and is accessed atomically.
431 atomic_t online_vcpus;
433 int last_boosted_vcpu;
434 struct list_head vm_list;
436 struct kvm_io_bus __rcu *buses[KVM_NR_BUSES];
437 #ifdef CONFIG_HAVE_KVM_EVENTFD
440 struct list_head items;
441 struct list_head resampler_list;
442 struct mutex resampler_lock;
444 struct list_head ioeventfds;
446 struct kvm_vm_stat stat;
447 struct kvm_arch arch;
448 refcount_t users_count;
449 #ifdef CONFIG_KVM_MMIO
450 struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
451 spinlock_t ring_lock;
452 struct list_head coalesced_zones;
455 struct mutex irq_lock;
456 #ifdef CONFIG_HAVE_KVM_IRQCHIP
458 * Update side is protected by irq_lock.
460 struct kvm_irq_routing_table __rcu *irq_routing;
462 #ifdef CONFIG_HAVE_KVM_IRQFD
463 struct hlist_head irq_ack_notifier_list;
466 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
467 struct mmu_notifier mmu_notifier;
468 unsigned long mmu_notifier_seq;
469 long mmu_notifier_count;
472 struct list_head devices;
473 bool manual_dirty_log_protect;
474 struct dentry *debugfs_dentry;
475 struct kvm_stat_data **debugfs_stat_data;
476 struct srcu_struct srcu;
477 struct srcu_struct irq_srcu;
481 #define kvm_err(fmt, ...) \
482 pr_err("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
483 #define kvm_info(fmt, ...) \
484 pr_info("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
485 #define kvm_debug(fmt, ...) \
486 pr_debug("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
487 #define kvm_debug_ratelimited(fmt, ...) \
488 pr_debug_ratelimited("kvm [%i]: " fmt, task_pid_nr(current), \
490 #define kvm_pr_unimpl(fmt, ...) \
491 pr_err_ratelimited("kvm [%i]: " fmt, \
492 task_tgid_nr(current), ## __VA_ARGS__)
494 /* The guest did something we don't support. */
495 #define vcpu_unimpl(vcpu, fmt, ...) \
496 kvm_pr_unimpl("vcpu%i, guest rIP: 0x%lx " fmt, \
497 (vcpu)->vcpu_id, kvm_rip_read(vcpu), ## __VA_ARGS__)
499 #define vcpu_debug(vcpu, fmt, ...) \
500 kvm_debug("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
501 #define vcpu_debug_ratelimited(vcpu, fmt, ...) \
502 kvm_debug_ratelimited("vcpu%i " fmt, (vcpu)->vcpu_id, \
504 #define vcpu_err(vcpu, fmt, ...) \
505 kvm_err("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
507 static inline struct kvm_io_bus *kvm_get_bus(struct kvm *kvm, enum kvm_bus idx)
509 return srcu_dereference_check(kvm->buses[idx], &kvm->srcu,
510 lockdep_is_held(&kvm->slots_lock) ||
511 !refcount_read(&kvm->users_count));
514 static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
516 /* Pairs with smp_wmb() in kvm_vm_ioctl_create_vcpu, in case
517 * the caller has read kvm->online_vcpus before (as is the case
518 * for kvm_for_each_vcpu, for example).
521 return kvm->vcpus[i];
524 #define kvm_for_each_vcpu(idx, vcpup, kvm) \
526 idx < atomic_read(&kvm->online_vcpus) && \
527 (vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
530 static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id)
532 struct kvm_vcpu *vcpu = NULL;
537 if (id < KVM_MAX_VCPUS)
538 vcpu = kvm_get_vcpu(kvm, id);
539 if (vcpu && vcpu->vcpu_id == id)
541 kvm_for_each_vcpu(i, vcpu, kvm)
542 if (vcpu->vcpu_id == id)
547 static inline int kvm_vcpu_get_idx(struct kvm_vcpu *vcpu)
549 struct kvm_vcpu *tmp;
552 kvm_for_each_vcpu(idx, tmp, vcpu->kvm)
558 #define kvm_for_each_memslot(memslot, slots) \
559 for (memslot = &slots->memslots[0]; \
560 memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\
563 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
564 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
566 void vcpu_load(struct kvm_vcpu *vcpu);
567 void vcpu_put(struct kvm_vcpu *vcpu);
569 #ifdef __KVM_HAVE_IOAPIC
570 void kvm_arch_post_irq_ack_notifier_list_update(struct kvm *kvm);
571 void kvm_arch_post_irq_routing_update(struct kvm *kvm);
573 static inline void kvm_arch_post_irq_ack_notifier_list_update(struct kvm *kvm)
576 static inline void kvm_arch_post_irq_routing_update(struct kvm *kvm)
581 #ifdef CONFIG_HAVE_KVM_IRQFD
582 int kvm_irqfd_init(void);
583 void kvm_irqfd_exit(void);
585 static inline int kvm_irqfd_init(void)
590 static inline void kvm_irqfd_exit(void)
594 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
595 struct module *module);
598 void kvm_get_kvm(struct kvm *kvm);
599 void kvm_put_kvm(struct kvm *kvm);
601 static inline struct kvm_memslots *__kvm_memslots(struct kvm *kvm, int as_id)
603 return srcu_dereference_check(kvm->memslots[as_id], &kvm->srcu,
604 lockdep_is_held(&kvm->slots_lock) ||
605 !refcount_read(&kvm->users_count));
608 static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
610 return __kvm_memslots(kvm, 0);
613 static inline struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu)
615 int as_id = kvm_arch_vcpu_memslots_id(vcpu);
617 return __kvm_memslots(vcpu->kvm, as_id);
620 static inline struct kvm_memory_slot *
621 id_to_memslot(struct kvm_memslots *slots, int id)
623 int index = slots->id_to_index[id];
624 struct kvm_memory_slot *slot;
626 slot = &slots->memslots[index];
628 WARN_ON(slot->id != id);
633 * KVM_SET_USER_MEMORY_REGION ioctl allows the following operations:
634 * - create a new memory slot
635 * - delete an existing memory slot
636 * - modify an existing memory slot
637 * -- move it in the guest physical memory space
638 * -- just change its flags
640 * Since flags can be changed by some of these operations, the following
641 * differentiation is the best we can do for __kvm_set_memory_region():
650 int kvm_set_memory_region(struct kvm *kvm,
651 const struct kvm_userspace_memory_region *mem);
652 int __kvm_set_memory_region(struct kvm *kvm,
653 const struct kvm_userspace_memory_region *mem);
654 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
655 struct kvm_memory_slot *dont);
656 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
657 unsigned long npages);
658 void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen);
659 int kvm_arch_prepare_memory_region(struct kvm *kvm,
660 struct kvm_memory_slot *memslot,
661 const struct kvm_userspace_memory_region *mem,
662 enum kvm_mr_change change);
663 void kvm_arch_commit_memory_region(struct kvm *kvm,
664 const struct kvm_userspace_memory_region *mem,
665 const struct kvm_memory_slot *old,
666 const struct kvm_memory_slot *new,
667 enum kvm_mr_change change);
668 bool kvm_largepages_enabled(void);
669 void kvm_disable_largepages(void);
670 /* flush all memory translations */
671 void kvm_arch_flush_shadow_all(struct kvm *kvm);
672 /* flush memory translations pointing to 'slot' */
673 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
674 struct kvm_memory_slot *slot);
676 int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
677 struct page **pages, int nr_pages);
679 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
680 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
681 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable);
682 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
683 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, gfn_t gfn,
685 void kvm_release_page_clean(struct page *page);
686 void kvm_release_page_dirty(struct page *page);
687 void kvm_set_page_accessed(struct page *page);
689 kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn);
690 kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
691 kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
693 kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
694 kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn);
695 kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
696 bool atomic, bool *async, bool write_fault,
699 void kvm_release_pfn_clean(kvm_pfn_t pfn);
700 void kvm_release_pfn_dirty(kvm_pfn_t pfn);
701 void kvm_set_pfn_dirty(kvm_pfn_t pfn);
702 void kvm_set_pfn_accessed(kvm_pfn_t pfn);
703 void kvm_get_pfn(kvm_pfn_t pfn);
705 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
707 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
709 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
710 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
711 void *data, unsigned long len);
712 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
713 int offset, int len);
714 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
716 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
717 void *data, unsigned long len);
718 int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
719 void *data, unsigned int offset,
721 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
722 gpa_t gpa, unsigned long len);
723 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
724 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
725 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
726 bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
727 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
728 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
730 struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu);
731 struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn);
732 kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn);
733 kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn);
734 struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn);
735 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn);
736 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable);
737 int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, int offset,
739 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, void *data,
741 int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data,
743 int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, const void *data,
744 int offset, int len);
745 int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
747 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn);
749 void kvm_sigset_activate(struct kvm_vcpu *vcpu);
750 void kvm_sigset_deactivate(struct kvm_vcpu *vcpu);
752 void kvm_vcpu_block(struct kvm_vcpu *vcpu);
753 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu);
754 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu);
755 bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu);
756 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
757 int kvm_vcpu_yield_to(struct kvm_vcpu *target);
758 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu, bool usermode_vcpu_not_eligible);
760 void kvm_flush_remote_tlbs(struct kvm *kvm);
761 void kvm_reload_remote_mmus(struct kvm *kvm);
763 bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
764 unsigned long *vcpu_bitmap, cpumask_var_t tmp);
765 bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);
767 long kvm_arch_dev_ioctl(struct file *filp,
768 unsigned int ioctl, unsigned long arg);
769 long kvm_arch_vcpu_ioctl(struct file *filp,
770 unsigned int ioctl, unsigned long arg);
771 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);
773 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext);
775 int kvm_get_dirty_log(struct kvm *kvm,
776 struct kvm_dirty_log *log, int *is_dirty);
778 int kvm_get_dirty_log_protect(struct kvm *kvm,
779 struct kvm_dirty_log *log, bool *flush);
780 int kvm_clear_dirty_log_protect(struct kvm *kvm,
781 struct kvm_clear_dirty_log *log, bool *flush);
783 void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
784 struct kvm_memory_slot *slot,
788 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
789 struct kvm_dirty_log *log);
790 int kvm_vm_ioctl_clear_dirty_log(struct kvm *kvm,
791 struct kvm_clear_dirty_log *log);
793 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
795 int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
796 struct kvm_enable_cap *cap);
797 long kvm_arch_vm_ioctl(struct file *filp,
798 unsigned int ioctl, unsigned long arg);
800 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
801 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
803 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
804 struct kvm_translation *tr);
806 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
807 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
808 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
809 struct kvm_sregs *sregs);
810 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
811 struct kvm_sregs *sregs);
812 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
813 struct kvm_mp_state *mp_state);
814 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
815 struct kvm_mp_state *mp_state);
816 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
817 struct kvm_guest_debug *dbg);
818 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
820 int kvm_arch_init(void *opaque);
821 void kvm_arch_exit(void);
823 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
824 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
826 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu);
828 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
829 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
830 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
831 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
832 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
833 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);
834 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
836 bool kvm_arch_has_vcpu_debugfs(void);
837 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu);
839 int kvm_arch_hardware_enable(void);
840 void kvm_arch_hardware_disable(void);
841 int kvm_arch_hardware_setup(void);
842 void kvm_arch_hardware_unsetup(void);
843 void kvm_arch_check_processor_compat(void *rtn);
844 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
845 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu);
846 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
848 #ifndef __KVM_HAVE_ARCH_VM_ALLOC
850 * All architectures that want to use vzalloc currently also
851 * need their own kvm_arch_alloc_vm implementation.
853 static inline struct kvm *kvm_arch_alloc_vm(void)
855 return kzalloc(sizeof(struct kvm), GFP_KERNEL);
858 static inline void kvm_arch_free_vm(struct kvm *kvm)
864 #ifndef __KVM_HAVE_ARCH_FLUSH_REMOTE_TLB
865 static inline int kvm_arch_flush_remote_tlb(struct kvm *kvm)
871 #ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA
872 void kvm_arch_register_noncoherent_dma(struct kvm *kvm);
873 void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm);
874 bool kvm_arch_has_noncoherent_dma(struct kvm *kvm);
876 static inline void kvm_arch_register_noncoherent_dma(struct kvm *kvm)
880 static inline void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm)
884 static inline bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
889 #ifdef __KVM_HAVE_ARCH_ASSIGNED_DEVICE
890 void kvm_arch_start_assignment(struct kvm *kvm);
891 void kvm_arch_end_assignment(struct kvm *kvm);
892 bool kvm_arch_has_assigned_device(struct kvm *kvm);
894 static inline void kvm_arch_start_assignment(struct kvm *kvm)
898 static inline void kvm_arch_end_assignment(struct kvm *kvm)
902 static inline bool kvm_arch_has_assigned_device(struct kvm *kvm)
908 static inline struct swait_queue_head *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
910 #ifdef __KVM_HAVE_ARCH_WQP
911 return vcpu->arch.wqp;
917 #ifdef __KVM_HAVE_ARCH_INTC_INITIALIZED
919 * returns true if the virtual interrupt controller is initialized and
920 * ready to accept virtual IRQ. On some architectures the virtual interrupt
921 * controller is dynamically instantiated and this is not always true.
923 bool kvm_arch_intc_initialized(struct kvm *kvm);
925 static inline bool kvm_arch_intc_initialized(struct kvm *kvm)
931 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
932 void kvm_arch_destroy_vm(struct kvm *kvm);
933 void kvm_arch_sync_events(struct kvm *kvm);
935 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
936 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
938 bool kvm_is_reserved_pfn(kvm_pfn_t pfn);
940 struct kvm_irq_ack_notifier {
941 struct hlist_node link;
943 void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
946 int kvm_irq_map_gsi(struct kvm *kvm,
947 struct kvm_kernel_irq_routing_entry *entries, int gsi);
948 int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin);
950 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
952 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
953 int irq_source_id, int level, bool line_status);
954 int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
955 struct kvm *kvm, int irq_source_id,
956 int level, bool line_status);
957 bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);
958 void kvm_notify_acked_gsi(struct kvm *kvm, int gsi);
959 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
960 void kvm_register_irq_ack_notifier(struct kvm *kvm,
961 struct kvm_irq_ack_notifier *kian);
962 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
963 struct kvm_irq_ack_notifier *kian);
964 int kvm_request_irq_source_id(struct kvm *kvm);
965 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
968 * search_memslots() and __gfn_to_memslot() are here because they are
969 * used in non-modular code in arch/powerpc/kvm/book3s_hv_rm_mmu.c.
970 * gfn_to_memslot() itself isn't here as an inline because that would
971 * bloat other code too much.
973 static inline struct kvm_memory_slot *
974 search_memslots(struct kvm_memslots *slots, gfn_t gfn)
976 int start = 0, end = slots->used_slots;
977 int slot = atomic_read(&slots->lru_slot);
978 struct kvm_memory_slot *memslots = slots->memslots;
980 if (gfn >= memslots[slot].base_gfn &&
981 gfn < memslots[slot].base_gfn + memslots[slot].npages)
982 return &memslots[slot];
984 while (start < end) {
985 slot = start + (end - start) / 2;
987 if (gfn >= memslots[slot].base_gfn)
993 if (gfn >= memslots[start].base_gfn &&
994 gfn < memslots[start].base_gfn + memslots[start].npages) {
995 atomic_set(&slots->lru_slot, start);
996 return &memslots[start];
1002 static inline struct kvm_memory_slot *
1003 __gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
1005 return search_memslots(slots, gfn);
1008 static inline unsigned long
1009 __gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1011 return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
1014 static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
1016 return gfn_to_memslot(kvm, gfn)->id;
1020 hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot)
1022 gfn_t gfn_offset = (hva - slot->userspace_addr) >> PAGE_SHIFT;
1024 return slot->base_gfn + gfn_offset;
1027 static inline gpa_t gfn_to_gpa(gfn_t gfn)
1029 return (gpa_t)gfn << PAGE_SHIFT;
1032 static inline gfn_t gpa_to_gfn(gpa_t gpa)
1034 return (gfn_t)(gpa >> PAGE_SHIFT);
1037 static inline hpa_t pfn_to_hpa(kvm_pfn_t pfn)
1039 return (hpa_t)pfn << PAGE_SHIFT;
1042 static inline struct page *kvm_vcpu_gpa_to_page(struct kvm_vcpu *vcpu,
1045 return kvm_vcpu_gfn_to_page(vcpu, gpa_to_gfn(gpa));
1048 static inline bool kvm_is_error_gpa(struct kvm *kvm, gpa_t gpa)
1050 unsigned long hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));
1052 return kvm_is_error_hva(hva);
1055 enum kvm_stat_kind {
1060 struct kvm_stat_data {
1065 struct kvm_stats_debugfs_item {
1068 enum kvm_stat_kind kind;
1070 extern struct kvm_stats_debugfs_item debugfs_entries[];
1071 extern struct dentry *kvm_debugfs_dir;
1073 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
1074 static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
1076 if (unlikely(kvm->mmu_notifier_count))
1079 * Ensure the read of mmu_notifier_count happens before the read
1080 * of mmu_notifier_seq. This interacts with the smp_wmb() in
1081 * mmu_notifier_invalidate_range_end to make sure that the caller
1082 * either sees the old (non-zero) value of mmu_notifier_count or
1083 * the new (incremented) value of mmu_notifier_seq.
1084 * PowerPC Book3s HV KVM calls this under a per-page lock
1085 * rather than under kvm->mmu_lock, for scalability, so
1086 * can't rely on kvm->mmu_lock to keep things ordered.
1089 if (kvm->mmu_notifier_seq != mmu_seq)
1095 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
1097 #define KVM_MAX_IRQ_ROUTES 4096 /* might need extension/rework in the future */
1099 bool kvm_arch_can_set_irq_routing(struct kvm *kvm);
1100 int kvm_set_irq_routing(struct kvm *kvm,
1101 const struct kvm_irq_routing_entry *entries,
1104 int kvm_set_routing_entry(struct kvm *kvm,
1105 struct kvm_kernel_irq_routing_entry *e,
1106 const struct kvm_irq_routing_entry *ue);
1107 void kvm_free_irq_routing(struct kvm *kvm);
1111 static inline void kvm_free_irq_routing(struct kvm *kvm) {}
1115 int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
1117 #ifdef CONFIG_HAVE_KVM_EVENTFD
1119 void kvm_eventfd_init(struct kvm *kvm);
1120 int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
1122 #ifdef CONFIG_HAVE_KVM_IRQFD
1123 int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args);
1124 void kvm_irqfd_release(struct kvm *kvm);
1125 void kvm_irq_routing_update(struct kvm *);
1127 static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
1132 static inline void kvm_irqfd_release(struct kvm *kvm) {}
1137 static inline void kvm_eventfd_init(struct kvm *kvm) {}
1139 static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
1144 static inline void kvm_irqfd_release(struct kvm *kvm) {}
1146 #ifdef CONFIG_HAVE_KVM_IRQCHIP
1147 static inline void kvm_irq_routing_update(struct kvm *kvm)
1152 static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
1157 #endif /* CONFIG_HAVE_KVM_EVENTFD */
1159 void kvm_arch_irq_routing_update(struct kvm *kvm);
1161 static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
1164 * Ensure the rest of the request is published to kvm_check_request's
1165 * caller. Paired with the smp_mb__after_atomic in kvm_check_request.
1168 set_bit(req & KVM_REQUEST_MASK, (void *)&vcpu->requests);
1171 static inline bool kvm_request_pending(struct kvm_vcpu *vcpu)
1173 return READ_ONCE(vcpu->requests);
1176 static inline bool kvm_test_request(int req, struct kvm_vcpu *vcpu)
1178 return test_bit(req & KVM_REQUEST_MASK, (void *)&vcpu->requests);
1181 static inline void kvm_clear_request(int req, struct kvm_vcpu *vcpu)
1183 clear_bit(req & KVM_REQUEST_MASK, (void *)&vcpu->requests);
1186 static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
1188 if (kvm_test_request(req, vcpu)) {
1189 kvm_clear_request(req, vcpu);
1192 * Ensure the rest of the request is visible to kvm_check_request's
1193 * caller. Paired with the smp_wmb in kvm_make_request.
1195 smp_mb__after_atomic();
1202 extern bool kvm_rebooting;
1204 extern unsigned int halt_poll_ns;
1205 extern unsigned int halt_poll_ns_grow;
1206 extern unsigned int halt_poll_ns_grow_start;
1207 extern unsigned int halt_poll_ns_shrink;
1210 struct kvm_device_ops *ops;
1213 struct list_head vm_node;
1216 /* create, destroy, and name are mandatory */
1217 struct kvm_device_ops {
1221 * create is called holding kvm->lock and any operations not suitable
1222 * to do while holding the lock should be deferred to init (see
1225 int (*create)(struct kvm_device *dev, u32 type);
1228 * init is called after create if create is successful and is called
1229 * outside of holding kvm->lock.
1231 void (*init)(struct kvm_device *dev);
1234 * Destroy is responsible for freeing dev.
1236 * Destroy may be called before or after destructors are called
1237 * on emulated I/O regions, depending on whether a reference is
1238 * held by a vcpu or other kvm component that gets destroyed
1239 * after the emulated I/O.
1241 void (*destroy)(struct kvm_device *dev);
1243 int (*set_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
1244 int (*get_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
1245 int (*has_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
1246 long (*ioctl)(struct kvm_device *dev, unsigned int ioctl,
1250 void kvm_device_get(struct kvm_device *dev);
1251 void kvm_device_put(struct kvm_device *dev);
1252 struct kvm_device *kvm_device_from_filp(struct file *filp);
1253 int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type);
1254 void kvm_unregister_device_ops(u32 type);
1256 extern struct kvm_device_ops kvm_mpic_ops;
1257 extern struct kvm_device_ops kvm_arm_vgic_v2_ops;
1258 extern struct kvm_device_ops kvm_arm_vgic_v3_ops;
1260 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1262 static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
1264 vcpu->spin_loop.in_spin_loop = val;
1266 static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
1268 vcpu->spin_loop.dy_eligible = val;
1271 #else /* !CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
1273 static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
1277 static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
1280 #endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
1282 #ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
1283 bool kvm_arch_has_irq_bypass(void);
1284 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *,
1285 struct irq_bypass_producer *);
1286 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *,
1287 struct irq_bypass_producer *);
1288 void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *);
1289 void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *);
1290 int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq,
1291 uint32_t guest_irq, bool set);
1292 #endif /* CONFIG_HAVE_KVM_IRQ_BYPASS */
1294 #ifdef CONFIG_HAVE_KVM_INVALID_WAKEUPS
1295 /* If we wakeup during the poll time, was it a sucessful poll? */
1296 static inline bool vcpu_valid_wakeup(struct kvm_vcpu *vcpu)
1298 return vcpu->valid_wakeup;
1302 static inline bool vcpu_valid_wakeup(struct kvm_vcpu *vcpu)
1306 #endif /* CONFIG_HAVE_KVM_INVALID_WAKEUPS */
1308 #ifdef CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL
1309 long kvm_arch_vcpu_async_ioctl(struct file *filp,
1310 unsigned int ioctl, unsigned long arg);
1312 static inline long kvm_arch_vcpu_async_ioctl(struct file *filp,
1316 return -ENOIOCTLCMD;
1318 #endif /* CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL */
1320 int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
1321 unsigned long start, unsigned long end, bool blockable);
1323 #ifdef CONFIG_HAVE_KVM_VCPU_RUN_PID_CHANGE
1324 int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu);
1326 static inline int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu)
1330 #endif /* CONFIG_HAVE_KVM_VCPU_RUN_PID_CHANGE */