2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
8 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
19 #include <kvm/iodev.h>
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/percpu.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/syscore_ops.h>
34 #include <linux/cpu.h>
35 #include <linux/sched/signal.h>
36 #include <linux/sched/mm.h>
37 #include <linux/sched/stat.h>
38 #include <linux/cpumask.h>
39 #include <linux/smp.h>
40 #include <linux/anon_inodes.h>
41 #include <linux/profile.h>
42 #include <linux/kvm_para.h>
43 #include <linux/pagemap.h>
44 #include <linux/mman.h>
45 #include <linux/swap.h>
46 #include <linux/bitops.h>
47 #include <linux/spinlock.h>
48 #include <linux/compat.h>
49 #include <linux/srcu.h>
50 #include <linux/hugetlb.h>
51 #include <linux/slab.h>
52 #include <linux/sort.h>
53 #include <linux/bsearch.h>
54 #include <linux/kthread.h>
57 #include <asm/processor.h>
58 #include <asm/ioctl.h>
59 #include <linux/uaccess.h>
60 #include <asm/pgtable.h>
62 #include "coalesced_mmio.h"
66 #define CREATE_TRACE_POINTS
67 #include <trace/events/kvm.h>
69 /* Worst case buffer size needed for holding an integer. */
70 #define ITOA_MAX_LEN 12
72 MODULE_AUTHOR("Qumranet");
73 MODULE_LICENSE("GPL");
75 /* Architectures should define their poll value according to the halt latency */
76 unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT;
77 module_param(halt_poll_ns, uint, 0644);
78 EXPORT_SYMBOL_GPL(halt_poll_ns);
80 /* Default doubles per-vcpu halt_poll_ns. */
81 unsigned int halt_poll_ns_grow = 2;
82 module_param(halt_poll_ns_grow, uint, 0644);
83 EXPORT_SYMBOL_GPL(halt_poll_ns_grow);
85 /* Default resets per-vcpu halt_poll_ns . */
86 unsigned int halt_poll_ns_shrink;
87 module_param(halt_poll_ns_shrink, uint, 0644);
88 EXPORT_SYMBOL_GPL(halt_poll_ns_shrink);
93 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
96 DEFINE_MUTEX(kvm_lock);
97 static DEFINE_RAW_SPINLOCK(kvm_count_lock);
100 static cpumask_var_t cpus_hardware_enabled;
101 static int kvm_usage_count;
102 static atomic_t hardware_enable_failed;
104 struct kmem_cache *kvm_vcpu_cache;
105 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
107 static __read_mostly struct preempt_ops kvm_preempt_ops;
109 struct dentry *kvm_debugfs_dir;
110 EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
112 static int kvm_debugfs_num_entries;
113 static const struct file_operations *stat_fops_per_vm[];
115 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
117 #ifdef CONFIG_KVM_COMPAT
118 static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
120 #define KVM_COMPAT(c) .compat_ioctl = (c)
122 static long kvm_no_compat_ioctl(struct file *file, unsigned int ioctl,
123 unsigned long arg) { return -EINVAL; }
124 #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl
126 static int hardware_enable_all(void);
127 static void hardware_disable_all(void);
129 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
131 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn);
133 __visible bool kvm_rebooting;
134 EXPORT_SYMBOL_GPL(kvm_rebooting);
136 static bool largepages_enabled = true;
138 #define KVM_EVENT_CREATE_VM 0
139 #define KVM_EVENT_DESTROY_VM 1
140 static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm);
141 static unsigned long long kvm_createvm_count;
142 static unsigned long long kvm_active_vms;
144 __weak void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
145 unsigned long start, unsigned long end)
149 bool kvm_is_zone_device_pfn(kvm_pfn_t pfn)
152 * The metadata used by is_zone_device_page() to determine whether or
153 * not a page is ZONE_DEVICE is guaranteed to be valid if and only if
154 * the device has been pinned, e.g. by get_user_pages(). WARN if the
155 * page_count() is zero to help detect bad usage of this helper.
157 if (!pfn_valid(pfn) || WARN_ON_ONCE(!page_count(pfn_to_page(pfn))))
160 return is_zone_device_page(pfn_to_page(pfn));
163 bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
166 * ZONE_DEVICE pages currently set PG_reserved, but from a refcounting
167 * perspective they are "normal" pages, albeit with slightly different
171 return PageReserved(pfn_to_page(pfn)) &&
173 !kvm_is_zone_device_pfn(pfn);
179 * Switches to specified vcpu, until a matching vcpu_put()
181 void vcpu_load(struct kvm_vcpu *vcpu)
184 preempt_notifier_register(&vcpu->preempt_notifier);
185 kvm_arch_vcpu_load(vcpu, cpu);
188 EXPORT_SYMBOL_GPL(vcpu_load);
190 void vcpu_put(struct kvm_vcpu *vcpu)
193 kvm_arch_vcpu_put(vcpu);
194 preempt_notifier_unregister(&vcpu->preempt_notifier);
197 EXPORT_SYMBOL_GPL(vcpu_put);
199 /* TODO: merge with kvm_arch_vcpu_should_kick */
200 static bool kvm_request_needs_ipi(struct kvm_vcpu *vcpu, unsigned req)
202 int mode = kvm_vcpu_exiting_guest_mode(vcpu);
205 * We need to wait for the VCPU to reenable interrupts and get out of
206 * READING_SHADOW_PAGE_TABLES mode.
208 if (req & KVM_REQUEST_WAIT)
209 return mode != OUTSIDE_GUEST_MODE;
212 * Need to kick a running VCPU, but otherwise there is nothing to do.
214 return mode == IN_GUEST_MODE;
217 static void ack_flush(void *_completed)
221 static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait)
224 cpus = cpu_online_mask;
226 if (cpumask_empty(cpus))
229 smp_call_function_many(cpus, ack_flush, NULL, wait);
233 bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
234 unsigned long *vcpu_bitmap, cpumask_var_t tmp)
237 struct kvm_vcpu *vcpu;
242 kvm_for_each_vcpu(i, vcpu, kvm) {
243 if (!test_bit(i, vcpu_bitmap))
246 kvm_make_request(req, vcpu);
249 if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu))
252 if (tmp != NULL && cpu != -1 && cpu != me &&
253 kvm_request_needs_ipi(vcpu, req))
254 __cpumask_set_cpu(cpu, tmp);
257 called = kvm_kick_many_cpus(tmp, !!(req & KVM_REQUEST_WAIT));
263 bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
267 static unsigned long vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)]
268 = {[0 ... BITS_TO_LONGS(KVM_MAX_VCPUS)-1] = ULONG_MAX};
270 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
272 called = kvm_make_vcpus_request_mask(kvm, req, vcpu_bitmap, cpus);
274 free_cpumask_var(cpus);
278 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
279 void kvm_flush_remote_tlbs(struct kvm *kvm)
282 * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
283 * kvm_make_all_cpus_request.
285 long dirty_count = smp_load_acquire(&kvm->tlbs_dirty);
288 * We want to publish modifications to the page tables before reading
289 * mode. Pairs with a memory barrier in arch-specific code.
290 * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest
291 * and smp_mb in walk_shadow_page_lockless_begin/end.
292 * - powerpc: smp_mb in kvmppc_prepare_to_enter.
294 * There is already an smp_mb__after_atomic() before
295 * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
298 if (!kvm_arch_flush_remote_tlb(kvm)
299 || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
300 ++kvm->stat.remote_tlb_flush;
301 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
303 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
306 void kvm_reload_remote_mmus(struct kvm *kvm)
308 kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
311 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
316 mutex_init(&vcpu->mutex);
321 init_swait_queue_head(&vcpu->wq);
322 kvm_async_pf_vcpu_init(vcpu);
325 INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
327 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
332 vcpu->run = page_address(page);
334 kvm_vcpu_set_in_spin_loop(vcpu, false);
335 kvm_vcpu_set_dy_eligible(vcpu, false);
336 vcpu->preempted = false;
338 r = kvm_arch_vcpu_init(vcpu);
344 free_page((unsigned long)vcpu->run);
348 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
350 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
353 * no need for rcu_read_lock as VCPU_RUN is the only place that
354 * will change the vcpu->pid pointer and on uninit all file
355 * descriptors are already gone.
357 put_pid(rcu_dereference_protected(vcpu->pid, 1));
358 kvm_arch_vcpu_uninit(vcpu);
359 free_page((unsigned long)vcpu->run);
361 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
363 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
364 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
366 return container_of(mn, struct kvm, mmu_notifier);
369 static void kvm_mmu_notifier_invalidate_range(struct mmu_notifier *mn,
370 struct mm_struct *mm,
371 unsigned long start, unsigned long end)
373 struct kvm *kvm = mmu_notifier_to_kvm(mn);
376 idx = srcu_read_lock(&kvm->srcu);
377 kvm_arch_mmu_notifier_invalidate_range(kvm, start, end);
378 srcu_read_unlock(&kvm->srcu, idx);
381 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
382 struct mm_struct *mm,
383 unsigned long address,
386 struct kvm *kvm = mmu_notifier_to_kvm(mn);
389 idx = srcu_read_lock(&kvm->srcu);
390 spin_lock(&kvm->mmu_lock);
391 kvm->mmu_notifier_seq++;
392 kvm_set_spte_hva(kvm, address, pte);
393 spin_unlock(&kvm->mmu_lock);
394 srcu_read_unlock(&kvm->srcu, idx);
397 static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
398 struct mm_struct *mm,
403 struct kvm *kvm = mmu_notifier_to_kvm(mn);
404 int need_tlb_flush = 0, idx;
406 idx = srcu_read_lock(&kvm->srcu);
407 spin_lock(&kvm->mmu_lock);
409 * The count increase must become visible at unlock time as no
410 * spte can be established without taking the mmu_lock and
411 * count is also read inside the mmu_lock critical section.
413 kvm->mmu_notifier_count++;
414 need_tlb_flush = kvm_unmap_hva_range(kvm, start, end, blockable);
415 /* we've to flush the tlb before the pages can be freed */
416 if (need_tlb_flush || kvm->tlbs_dirty)
417 kvm_flush_remote_tlbs(kvm);
419 spin_unlock(&kvm->mmu_lock);
420 srcu_read_unlock(&kvm->srcu, idx);
425 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
426 struct mm_struct *mm,
430 struct kvm *kvm = mmu_notifier_to_kvm(mn);
432 spin_lock(&kvm->mmu_lock);
434 * This sequence increase will notify the kvm page fault that
435 * the page that is going to be mapped in the spte could have
438 kvm->mmu_notifier_seq++;
441 * The above sequence increase must be visible before the
442 * below count decrease, which is ensured by the smp_wmb above
443 * in conjunction with the smp_rmb in mmu_notifier_retry().
445 kvm->mmu_notifier_count--;
446 spin_unlock(&kvm->mmu_lock);
448 BUG_ON(kvm->mmu_notifier_count < 0);
451 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
452 struct mm_struct *mm,
456 struct kvm *kvm = mmu_notifier_to_kvm(mn);
459 idx = srcu_read_lock(&kvm->srcu);
460 spin_lock(&kvm->mmu_lock);
462 young = kvm_age_hva(kvm, start, end);
464 kvm_flush_remote_tlbs(kvm);
466 spin_unlock(&kvm->mmu_lock);
467 srcu_read_unlock(&kvm->srcu, idx);
472 static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
473 struct mm_struct *mm,
477 struct kvm *kvm = mmu_notifier_to_kvm(mn);
480 idx = srcu_read_lock(&kvm->srcu);
481 spin_lock(&kvm->mmu_lock);
483 * Even though we do not flush TLB, this will still adversely
484 * affect performance on pre-Haswell Intel EPT, where there is
485 * no EPT Access Bit to clear so that we have to tear down EPT
486 * tables instead. If we find this unacceptable, we can always
487 * add a parameter to kvm_age_hva so that it effectively doesn't
488 * do anything on clear_young.
490 * Also note that currently we never issue secondary TLB flushes
491 * from clear_young, leaving this job up to the regular system
492 * cadence. If we find this inaccurate, we might come up with a
493 * more sophisticated heuristic later.
495 young = kvm_age_hva(kvm, start, end);
496 spin_unlock(&kvm->mmu_lock);
497 srcu_read_unlock(&kvm->srcu, idx);
502 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
503 struct mm_struct *mm,
504 unsigned long address)
506 struct kvm *kvm = mmu_notifier_to_kvm(mn);
509 idx = srcu_read_lock(&kvm->srcu);
510 spin_lock(&kvm->mmu_lock);
511 young = kvm_test_age_hva(kvm, address);
512 spin_unlock(&kvm->mmu_lock);
513 srcu_read_unlock(&kvm->srcu, idx);
518 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
519 struct mm_struct *mm)
521 struct kvm *kvm = mmu_notifier_to_kvm(mn);
524 idx = srcu_read_lock(&kvm->srcu);
525 kvm_arch_flush_shadow_all(kvm);
526 srcu_read_unlock(&kvm->srcu, idx);
529 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
530 .flags = MMU_INVALIDATE_DOES_NOT_BLOCK,
531 .invalidate_range = kvm_mmu_notifier_invalidate_range,
532 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
533 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
534 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
535 .clear_young = kvm_mmu_notifier_clear_young,
536 .test_young = kvm_mmu_notifier_test_young,
537 .change_pte = kvm_mmu_notifier_change_pte,
538 .release = kvm_mmu_notifier_release,
541 static int kvm_init_mmu_notifier(struct kvm *kvm)
543 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
544 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
547 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
549 static int kvm_init_mmu_notifier(struct kvm *kvm)
554 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
556 static struct kvm_memslots *kvm_alloc_memslots(void)
559 struct kvm_memslots *slots;
561 slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
565 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
566 slots->id_to_index[i] = slots->memslots[i].id = i;
571 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
573 if (!memslot->dirty_bitmap)
576 kvfree(memslot->dirty_bitmap);
577 memslot->dirty_bitmap = NULL;
581 * Free any memory in @free but not in @dont.
583 static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
584 struct kvm_memory_slot *dont)
586 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
587 kvm_destroy_dirty_bitmap(free);
589 kvm_arch_free_memslot(kvm, free, dont);
594 static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
596 struct kvm_memory_slot *memslot;
601 kvm_for_each_memslot(memslot, slots)
602 kvm_free_memslot(kvm, memslot, NULL);
607 static void kvm_destroy_vm_debugfs(struct kvm *kvm)
611 if (!kvm->debugfs_dentry)
614 debugfs_remove_recursive(kvm->debugfs_dentry);
616 if (kvm->debugfs_stat_data) {
617 for (i = 0; i < kvm_debugfs_num_entries; i++)
618 kfree(kvm->debugfs_stat_data[i]);
619 kfree(kvm->debugfs_stat_data);
623 static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
625 char dir_name[ITOA_MAX_LEN * 2];
626 struct kvm_stat_data *stat_data;
627 struct kvm_stats_debugfs_item *p;
629 if (!debugfs_initialized())
632 snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd);
633 kvm->debugfs_dentry = debugfs_create_dir(dir_name, kvm_debugfs_dir);
635 kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries,
636 sizeof(*kvm->debugfs_stat_data),
638 if (!kvm->debugfs_stat_data)
641 for (p = debugfs_entries; p->name; p++) {
642 stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL);
646 stat_data->kvm = kvm;
647 stat_data->offset = p->offset;
648 stat_data->mode = p->mode ? p->mode : 0644;
649 kvm->debugfs_stat_data[p - debugfs_entries] = stat_data;
650 debugfs_create_file(p->name, stat_data->mode, kvm->debugfs_dentry,
651 stat_data, stat_fops_per_vm[p->kind]);
657 * Called after the VM is otherwise initialized, but just before adding it to
660 int __weak kvm_arch_post_init_vm(struct kvm *kvm)
666 * Called just after removing the VM from the vm_list, but before doing any
669 void __weak kvm_arch_pre_destroy_vm(struct kvm *kvm)
673 static struct kvm *kvm_create_vm(unsigned long type)
676 struct kvm *kvm = kvm_arch_alloc_vm();
679 return ERR_PTR(-ENOMEM);
681 spin_lock_init(&kvm->mmu_lock);
683 kvm->mm = current->mm;
684 kvm_eventfd_init(kvm);
685 mutex_init(&kvm->lock);
686 mutex_init(&kvm->irq_lock);
687 mutex_init(&kvm->slots_lock);
688 refcount_set(&kvm->users_count, 1);
689 INIT_LIST_HEAD(&kvm->devices);
691 r = kvm_arch_init_vm(kvm, type);
693 goto out_err_no_disable;
695 r = hardware_enable_all();
697 goto out_err_no_disable;
699 #ifdef CONFIG_HAVE_KVM_IRQFD
700 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
703 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
706 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
707 struct kvm_memslots *slots = kvm_alloc_memslots();
709 goto out_err_no_srcu;
711 * Generations must be different for each address space.
712 * Init kvm generation close to the maximum to easily test the
713 * code of handling generation number wrap-around.
715 slots->generation = i * 2 - 150;
716 rcu_assign_pointer(kvm->memslots[i], slots);
719 if (init_srcu_struct(&kvm->srcu))
720 goto out_err_no_srcu;
721 if (init_srcu_struct(&kvm->irq_srcu))
722 goto out_err_no_irq_srcu;
723 for (i = 0; i < KVM_NR_BUSES; i++) {
724 rcu_assign_pointer(kvm->buses[i],
725 kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL));
727 goto out_err_no_mmu_notifier;
730 r = kvm_init_mmu_notifier(kvm);
732 goto out_err_no_mmu_notifier;
734 r = kvm_arch_post_init_vm(kvm);
738 mutex_lock(&kvm_lock);
739 list_add(&kvm->vm_list, &vm_list);
740 mutex_unlock(&kvm_lock);
742 preempt_notifier_inc();
747 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
748 if (kvm->mmu_notifier.ops)
749 mmu_notifier_unregister(&kvm->mmu_notifier, current->mm);
751 out_err_no_mmu_notifier:
752 cleanup_srcu_struct(&kvm->irq_srcu);
754 cleanup_srcu_struct(&kvm->srcu);
756 hardware_disable_all();
758 refcount_set(&kvm->users_count, 0);
759 for (i = 0; i < KVM_NR_BUSES; i++)
760 kfree(kvm_get_bus(kvm, i));
761 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
762 kvm_free_memslots(kvm, __kvm_memslots(kvm, i));
763 kvm_arch_free_vm(kvm);
768 static void kvm_destroy_devices(struct kvm *kvm)
770 struct kvm_device *dev, *tmp;
773 * We do not need to take the kvm->lock here, because nobody else
774 * has a reference to the struct kvm at this point and therefore
775 * cannot access the devices list anyhow.
777 list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) {
778 list_del(&dev->vm_node);
779 dev->ops->destroy(dev);
783 static void kvm_destroy_vm(struct kvm *kvm)
786 struct mm_struct *mm = kvm->mm;
788 kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm);
789 kvm_destroy_vm_debugfs(kvm);
790 kvm_arch_sync_events(kvm);
791 mutex_lock(&kvm_lock);
792 list_del(&kvm->vm_list);
793 mutex_unlock(&kvm_lock);
794 kvm_arch_pre_destroy_vm(kvm);
796 kvm_free_irq_routing(kvm);
797 for (i = 0; i < KVM_NR_BUSES; i++) {
798 struct kvm_io_bus *bus = kvm_get_bus(kvm, i);
801 kvm_io_bus_destroy(bus);
802 kvm->buses[i] = NULL;
804 kvm_coalesced_mmio_free(kvm);
805 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
806 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
808 kvm_arch_flush_shadow_all(kvm);
810 kvm_arch_destroy_vm(kvm);
811 kvm_destroy_devices(kvm);
812 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
813 kvm_free_memslots(kvm, __kvm_memslots(kvm, i));
814 cleanup_srcu_struct(&kvm->irq_srcu);
815 cleanup_srcu_struct(&kvm->srcu);
816 kvm_arch_free_vm(kvm);
817 preempt_notifier_dec();
818 hardware_disable_all();
822 void kvm_get_kvm(struct kvm *kvm)
824 refcount_inc(&kvm->users_count);
826 EXPORT_SYMBOL_GPL(kvm_get_kvm);
828 void kvm_put_kvm(struct kvm *kvm)
830 if (refcount_dec_and_test(&kvm->users_count))
833 EXPORT_SYMBOL_GPL(kvm_put_kvm);
836 static int kvm_vm_release(struct inode *inode, struct file *filp)
838 struct kvm *kvm = filp->private_data;
840 kvm_irqfd_release(kvm);
847 * Allocation size is twice as large as the actual dirty bitmap size.
848 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
850 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
852 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
854 memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL);
855 if (!memslot->dirty_bitmap)
862 * Insert memslot and re-sort memslots based on their GFN,
863 * so binary search could be used to lookup GFN.
864 * Sorting algorithm takes advantage of having initially
865 * sorted array and known changed memslot position.
867 static void update_memslots(struct kvm_memslots *slots,
868 struct kvm_memory_slot *new)
871 int i = slots->id_to_index[id];
872 struct kvm_memory_slot *mslots = slots->memslots;
874 WARN_ON(mslots[i].id != id);
876 WARN_ON(!mslots[i].npages);
877 if (mslots[i].npages)
880 if (!mslots[i].npages)
884 while (i < KVM_MEM_SLOTS_NUM - 1 &&
885 new->base_gfn <= mslots[i + 1].base_gfn) {
886 if (!mslots[i + 1].npages)
888 mslots[i] = mslots[i + 1];
889 slots->id_to_index[mslots[i].id] = i;
894 * The ">=" is needed when creating a slot with base_gfn == 0,
895 * so that it moves before all those with base_gfn == npages == 0.
897 * On the other hand, if new->npages is zero, the above loop has
898 * already left i pointing to the beginning of the empty part of
899 * mslots, and the ">=" would move the hole backwards in this
900 * case---which is wrong. So skip the loop when deleting a slot.
904 new->base_gfn >= mslots[i - 1].base_gfn) {
905 mslots[i] = mslots[i - 1];
906 slots->id_to_index[mslots[i].id] = i;
910 WARN_ON_ONCE(i != slots->used_slots);
913 slots->id_to_index[mslots[i].id] = i;
916 static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem)
918 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
920 #ifdef __KVM_HAVE_READONLY_MEM
921 valid_flags |= KVM_MEM_READONLY;
924 if (mem->flags & ~valid_flags)
930 static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
931 int as_id, struct kvm_memslots *slots)
933 struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id);
937 * Set the low bit in the generation, which disables SPTE caching
938 * until the end of synchronize_srcu_expedited.
940 WARN_ON(old_memslots->generation & 1);
941 slots->generation = old_memslots->generation + 1;
943 rcu_assign_pointer(kvm->memslots[as_id], slots);
944 synchronize_srcu_expedited(&kvm->srcu);
947 * Increment the new memslot generation a second time. This prevents
948 * vm exits that race with memslot updates from caching a memslot
949 * generation that will (potentially) be valid forever.
951 * Generations must be unique even across address spaces. We do not need
952 * a global counter for that, instead the generation space is evenly split
953 * across address spaces. For example, with two address spaces, address
954 * space 0 will use generations 0, 4, 8, ... while * address space 1 will
955 * use generations 2, 6, 10, 14, ...
957 gen = slots->generation + KVM_ADDRESS_SPACE_NUM * 2 - 1;
959 kvm_arch_memslots_updated(kvm, gen);
961 slots->generation = gen;
967 * Allocate some memory and give it an address in the guest physical address
970 * Discontiguous memory is allowed, mostly for framebuffers.
972 * Must be called holding kvm->slots_lock for write.
974 int __kvm_set_memory_region(struct kvm *kvm,
975 const struct kvm_userspace_memory_region *mem)
979 unsigned long npages;
980 struct kvm_memory_slot *slot;
981 struct kvm_memory_slot old, new;
982 struct kvm_memslots *slots = NULL, *old_memslots;
984 enum kvm_mr_change change;
986 r = check_memory_region_flags(mem);
991 as_id = mem->slot >> 16;
994 /* General sanity checks */
995 if (mem->memory_size & (PAGE_SIZE - 1))
997 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
999 /* We can read the guest memory with __xxx_user() later on. */
1000 if ((id < KVM_USER_MEM_SLOTS) &&
1001 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
1002 !access_ok(VERIFY_WRITE,
1003 (void __user *)(unsigned long)mem->userspace_addr,
1006 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM)
1008 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
1011 slot = id_to_memslot(__kvm_memslots(kvm, as_id), id);
1012 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
1013 npages = mem->memory_size >> PAGE_SHIFT;
1015 if (npages > KVM_MEM_MAX_NR_PAGES)
1021 new.base_gfn = base_gfn;
1022 new.npages = npages;
1023 new.flags = mem->flags;
1027 change = KVM_MR_CREATE;
1028 else { /* Modify an existing slot. */
1029 if ((mem->userspace_addr != old.userspace_addr) ||
1030 (npages != old.npages) ||
1031 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
1034 if (base_gfn != old.base_gfn)
1035 change = KVM_MR_MOVE;
1036 else if (new.flags != old.flags)
1037 change = KVM_MR_FLAGS_ONLY;
1038 else { /* Nothing to change. */
1047 change = KVM_MR_DELETE;
1052 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
1053 /* Check for overlaps */
1055 kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) {
1058 if (!((base_gfn + npages <= slot->base_gfn) ||
1059 (base_gfn >= slot->base_gfn + slot->npages)))
1064 /* Free page dirty bitmap if unneeded */
1065 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
1066 new.dirty_bitmap = NULL;
1069 if (change == KVM_MR_CREATE) {
1070 new.userspace_addr = mem->userspace_addr;
1072 if (kvm_arch_create_memslot(kvm, &new, npages))
1076 /* Allocate page dirty bitmap if needed */
1077 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
1078 if (kvm_create_dirty_bitmap(&new) < 0)
1082 slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
1085 memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots));
1087 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
1088 slot = id_to_memslot(slots, id);
1089 slot->flags |= KVM_MEMSLOT_INVALID;
1091 old_memslots = install_new_memslots(kvm, as_id, slots);
1093 /* From this point no new shadow pages pointing to a deleted,
1094 * or moved, memslot will be created.
1096 * validation of sp->gfn happens in:
1097 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
1098 * - kvm_is_visible_gfn (mmu_check_roots)
1100 kvm_arch_flush_shadow_memslot(kvm, slot);
1103 * We can re-use the old_memslots from above, the only difference
1104 * from the currently installed memslots is the invalid flag. This
1105 * will get overwritten by update_memslots anyway.
1107 slots = old_memslots;
1110 r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
1114 /* actual memory is freed via old in kvm_free_memslot below */
1115 if (change == KVM_MR_DELETE) {
1116 new.dirty_bitmap = NULL;
1117 memset(&new.arch, 0, sizeof(new.arch));
1120 update_memslots(slots, &new);
1121 old_memslots = install_new_memslots(kvm, as_id, slots);
1123 kvm_arch_commit_memory_region(kvm, mem, &old, &new, change);
1125 kvm_free_memslot(kvm, &old, &new);
1126 kvfree(old_memslots);
1132 kvm_free_memslot(kvm, &new, &old);
1136 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
1138 int kvm_set_memory_region(struct kvm *kvm,
1139 const struct kvm_userspace_memory_region *mem)
1143 mutex_lock(&kvm->slots_lock);
1144 r = __kvm_set_memory_region(kvm, mem);
1145 mutex_unlock(&kvm->slots_lock);
1148 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1150 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1151 struct kvm_userspace_memory_region *mem)
1153 if ((u16)mem->slot >= KVM_USER_MEM_SLOTS)
1156 return kvm_set_memory_region(kvm, mem);
1159 int kvm_get_dirty_log(struct kvm *kvm,
1160 struct kvm_dirty_log *log, int *is_dirty)
1162 struct kvm_memslots *slots;
1163 struct kvm_memory_slot *memslot;
1166 unsigned long any = 0;
1168 as_id = log->slot >> 16;
1169 id = (u16)log->slot;
1170 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1173 slots = __kvm_memslots(kvm, as_id);
1174 memslot = id_to_memslot(slots, id);
1175 if (!memslot->dirty_bitmap)
1178 n = kvm_dirty_bitmap_bytes(memslot);
1180 for (i = 0; !any && i < n/sizeof(long); ++i)
1181 any = memslot->dirty_bitmap[i];
1183 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1190 EXPORT_SYMBOL_GPL(kvm_get_dirty_log);
1192 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1194 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1195 * are dirty write protect them for next write.
1196 * @kvm: pointer to kvm instance
1197 * @log: slot id and address to which we copy the log
1198 * @is_dirty: flag set if any page is dirty
1200 * We need to keep it in mind that VCPU threads can write to the bitmap
1201 * concurrently. So, to avoid losing track of dirty pages we keep the
1204 * 1. Take a snapshot of the bit and clear it if needed.
1205 * 2. Write protect the corresponding page.
1206 * 3. Copy the snapshot to the userspace.
1207 * 4. Upon return caller flushes TLB's if needed.
1209 * Between 2 and 4, the guest may write to the page using the remaining TLB
1210 * entry. This is not a problem because the page is reported dirty using
1211 * the snapshot taken before and step 4 ensures that writes done after
1212 * exiting to userspace will be logged for the next call.
1215 int kvm_get_dirty_log_protect(struct kvm *kvm,
1216 struct kvm_dirty_log *log, bool *is_dirty)
1218 struct kvm_memslots *slots;
1219 struct kvm_memory_slot *memslot;
1222 unsigned long *dirty_bitmap;
1223 unsigned long *dirty_bitmap_buffer;
1225 as_id = log->slot >> 16;
1226 id = (u16)log->slot;
1227 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1230 slots = __kvm_memslots(kvm, as_id);
1231 memslot = id_to_memslot(slots, id);
1233 dirty_bitmap = memslot->dirty_bitmap;
1237 n = kvm_dirty_bitmap_bytes(memslot);
1239 dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot);
1240 memset(dirty_bitmap_buffer, 0, n);
1242 spin_lock(&kvm->mmu_lock);
1244 for (i = 0; i < n / sizeof(long); i++) {
1248 if (!dirty_bitmap[i])
1253 mask = xchg(&dirty_bitmap[i], 0);
1254 dirty_bitmap_buffer[i] = mask;
1257 offset = i * BITS_PER_LONG;
1258 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
1263 spin_unlock(&kvm->mmu_lock);
1264 if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
1268 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect);
1271 bool kvm_largepages_enabled(void)
1273 return largepages_enabled;
1276 void kvm_disable_largepages(void)
1278 largepages_enabled = false;
1280 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
1282 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1284 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1286 EXPORT_SYMBOL_GPL(gfn_to_memslot);
1288 struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn)
1290 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn);
1293 bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1295 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1297 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
1298 memslot->flags & KVM_MEMSLOT_INVALID)
1303 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1305 unsigned long kvm_host_page_size(struct kvm_vcpu *vcpu, gfn_t gfn)
1307 struct vm_area_struct *vma;
1308 unsigned long addr, size;
1312 addr = kvm_vcpu_gfn_to_hva_prot(vcpu, gfn, NULL);
1313 if (kvm_is_error_hva(addr))
1316 down_read(¤t->mm->mmap_sem);
1317 vma = find_vma(current->mm, addr);
1321 size = vma_kernel_pagesize(vma);
1324 up_read(¤t->mm->mmap_sem);
1329 static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1331 return slot->flags & KVM_MEM_READONLY;
1334 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1335 gfn_t *nr_pages, bool write)
1337 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1338 return KVM_HVA_ERR_BAD;
1340 if (memslot_is_readonly(slot) && write)
1341 return KVM_HVA_ERR_RO_BAD;
1344 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1346 return __gfn_to_hva_memslot(slot, gfn);
1349 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1352 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1355 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1358 return gfn_to_hva_many(slot, gfn, NULL);
1360 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1362 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1364 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1366 EXPORT_SYMBOL_GPL(gfn_to_hva);
1368 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn)
1370 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL);
1372 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva);
1375 * If writable is set to false, the hva returned by this function is only
1376 * allowed to be read.
1378 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot,
1379 gfn_t gfn, bool *writable)
1381 unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false);
1383 if (!kvm_is_error_hva(hva) && writable)
1384 *writable = !memslot_is_readonly(slot);
1389 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
1391 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1393 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1396 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable)
1398 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1400 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1403 static inline int check_user_page_hwpoison(unsigned long addr)
1405 int rc, flags = FOLL_HWPOISON | FOLL_WRITE;
1407 rc = get_user_pages(addr, 1, flags, NULL, NULL);
1408 return rc == -EHWPOISON;
1412 * The fast path to get the writable pfn which will be stored in @pfn,
1413 * true indicates success, otherwise false is returned. It's also the
1414 * only part that runs if we can are in atomic context.
1416 static bool hva_to_pfn_fast(unsigned long addr, bool write_fault,
1417 bool *writable, kvm_pfn_t *pfn)
1419 struct page *page[1];
1423 * Fast pin a writable pfn only if it is a write fault request
1424 * or the caller allows to map a writable pfn for a read fault
1427 if (!(write_fault || writable))
1430 npages = __get_user_pages_fast(addr, 1, 1, page);
1432 *pfn = page_to_pfn(page[0]);
1443 * The slow path to get the pfn of the specified host virtual address,
1444 * 1 indicates success, -errno is returned if error is detected.
1446 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1447 bool *writable, kvm_pfn_t *pfn)
1449 unsigned int flags = FOLL_HWPOISON;
1456 *writable = write_fault;
1459 flags |= FOLL_WRITE;
1461 flags |= FOLL_NOWAIT;
1463 npages = get_user_pages_unlocked(addr, 1, &page, flags);
1467 /* map read fault as writable if possible */
1468 if (unlikely(!write_fault) && writable) {
1471 if (__get_user_pages_fast(addr, 1, 1, &wpage) == 1) {
1477 *pfn = page_to_pfn(page);
1481 static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1483 if (unlikely(!(vma->vm_flags & VM_READ)))
1486 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1492 static int kvm_try_get_pfn(kvm_pfn_t pfn)
1494 if (kvm_is_reserved_pfn(pfn))
1496 return get_page_unless_zero(pfn_to_page(pfn));
1499 static int hva_to_pfn_remapped(struct vm_area_struct *vma,
1500 unsigned long addr, bool *async,
1501 bool write_fault, bool *writable,
1509 r = follow_pte_pmd(vma->vm_mm, addr, NULL, NULL, &ptep, NULL, &ptl);
1512 * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
1513 * not call the fault handler, so do it here.
1515 bool unlocked = false;
1516 r = fixup_user_fault(current, current->mm, addr,
1517 (write_fault ? FAULT_FLAG_WRITE : 0),
1524 r = follow_pte_pmd(vma->vm_mm, addr, NULL, NULL, &ptep, NULL, &ptl);
1529 if (write_fault && !pte_write(*ptep)) {
1530 pfn = KVM_PFN_ERR_RO_FAULT;
1535 *writable = pte_write(*ptep);
1536 pfn = pte_pfn(*ptep);
1539 * Get a reference here because callers of *hva_to_pfn* and
1540 * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the
1541 * returned pfn. This is only needed if the VMA has VM_MIXEDMAP
1542 * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will
1543 * simply do nothing for reserved pfns.
1545 * Whoever called remap_pfn_range is also going to call e.g.
1546 * unmap_mapping_range before the underlying pages are freed,
1547 * causing a call to our MMU notifier.
1549 * Certain IO or PFNMAP mappings can be backed with valid
1550 * struct pages, but be allocated without refcounting e.g.,
1551 * tail pages of non-compound higher order allocations, which
1552 * would then underflow the refcount when the caller does the
1553 * required put_page. Don't allow those pages here.
1555 if (!kvm_try_get_pfn(pfn))
1559 pte_unmap_unlock(ptep, ptl);
1566 * Pin guest page in memory and return its pfn.
1567 * @addr: host virtual address which maps memory to the guest
1568 * @atomic: whether this function can sleep
1569 * @async: whether this function need to wait IO complete if the
1570 * host page is not in the memory
1571 * @write_fault: whether we should get a writable host page
1572 * @writable: whether it allows to map a writable host page for !@write_fault
1574 * The function will map a writable host page for these two cases:
1575 * 1): @write_fault = true
1576 * 2): @write_fault = false && @writable, @writable will tell the caller
1577 * whether the mapping is writable.
1579 static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1580 bool write_fault, bool *writable)
1582 struct vm_area_struct *vma;
1586 /* we can do it either atomically or asynchronously, not both */
1587 BUG_ON(atomic && async);
1589 if (hva_to_pfn_fast(addr, write_fault, writable, &pfn))
1593 return KVM_PFN_ERR_FAULT;
1595 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1599 down_read(¤t->mm->mmap_sem);
1600 if (npages == -EHWPOISON ||
1601 (!async && check_user_page_hwpoison(addr))) {
1602 pfn = KVM_PFN_ERR_HWPOISON;
1607 vma = find_vma_intersection(current->mm, addr, addr + 1);
1610 pfn = KVM_PFN_ERR_FAULT;
1611 else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) {
1612 r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn);
1616 pfn = KVM_PFN_ERR_FAULT;
1618 if (async && vma_is_valid(vma, write_fault))
1620 pfn = KVM_PFN_ERR_FAULT;
1623 up_read(¤t->mm->mmap_sem);
1627 kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
1628 bool atomic, bool *async, bool write_fault,
1631 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1633 if (addr == KVM_HVA_ERR_RO_BAD) {
1636 return KVM_PFN_ERR_RO_FAULT;
1639 if (kvm_is_error_hva(addr)) {
1642 return KVM_PFN_NOSLOT;
1645 /* Do not map writable pfn in the readonly memslot. */
1646 if (writable && memslot_is_readonly(slot)) {
1651 return hva_to_pfn(addr, atomic, async, write_fault,
1654 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot);
1656 kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1659 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL,
1660 write_fault, writable);
1662 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1664 kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1666 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1668 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot);
1670 kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1672 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1674 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1676 kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1678 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn);
1680 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1682 kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn)
1684 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1686 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic);
1688 kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1690 return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn);
1692 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1694 kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
1696 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1698 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn);
1700 int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1701 struct page **pages, int nr_pages)
1706 addr = gfn_to_hva_many(slot, gfn, &entry);
1707 if (kvm_is_error_hva(addr))
1710 if (entry < nr_pages)
1713 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1715 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1717 static struct page *kvm_pfn_to_page(kvm_pfn_t pfn)
1719 if (is_error_noslot_pfn(pfn))
1720 return KVM_ERR_PTR_BAD_PAGE;
1722 if (kvm_is_reserved_pfn(pfn)) {
1724 return KVM_ERR_PTR_BAD_PAGE;
1727 return pfn_to_page(pfn);
1730 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1734 pfn = gfn_to_pfn(kvm, gfn);
1736 return kvm_pfn_to_page(pfn);
1738 EXPORT_SYMBOL_GPL(gfn_to_page);
1740 void kvm_release_pfn(kvm_pfn_t pfn, bool dirty, struct gfn_to_pfn_cache *cache)
1746 cache->pfn = cache->gfn = 0;
1749 kvm_release_pfn_dirty(pfn);
1751 kvm_release_pfn_clean(pfn);
1754 static void kvm_cache_gfn_to_pfn(struct kvm_memory_slot *slot, gfn_t gfn,
1755 struct gfn_to_pfn_cache *cache, u64 gen)
1757 kvm_release_pfn(cache->pfn, cache->dirty, cache);
1759 cache->pfn = gfn_to_pfn_memslot(slot, gfn);
1761 cache->dirty = false;
1762 cache->generation = gen;
1765 static int __kvm_map_gfn(struct kvm_memslots *slots, gfn_t gfn,
1766 struct kvm_host_map *map,
1767 struct gfn_to_pfn_cache *cache,
1772 struct page *page = KVM_UNMAPPED_PAGE;
1773 struct kvm_memory_slot *slot = __gfn_to_memslot(slots, gfn);
1774 u64 gen = slots->generation;
1780 if (!cache->pfn || cache->gfn != gfn ||
1781 cache->generation != gen) {
1784 kvm_cache_gfn_to_pfn(slot, gfn, cache, gen);
1790 pfn = gfn_to_pfn_memslot(slot, gfn);
1792 if (is_error_noslot_pfn(pfn))
1795 if (pfn_valid(pfn)) {
1796 page = pfn_to_page(pfn);
1798 hva = kmap_atomic(page);
1801 #ifdef CONFIG_HAS_IOMEM
1802 } else if (!atomic) {
1803 hva = memremap(pfn_to_hpa(pfn), PAGE_SIZE, MEMREMAP_WB);
1820 int kvm_map_gfn(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map,
1821 struct gfn_to_pfn_cache *cache, bool atomic)
1823 return __kvm_map_gfn(kvm_memslots(vcpu->kvm), gfn, map,
1826 EXPORT_SYMBOL_GPL(kvm_map_gfn);
1828 int kvm_vcpu_map(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map)
1830 return __kvm_map_gfn(kvm_vcpu_memslots(vcpu), gfn, map,
1833 EXPORT_SYMBOL_GPL(kvm_vcpu_map);
1835 static void __kvm_unmap_gfn(struct kvm_memory_slot *memslot,
1836 struct kvm_host_map *map,
1837 struct gfn_to_pfn_cache *cache,
1838 bool dirty, bool atomic)
1846 if (map->page != KVM_UNMAPPED_PAGE) {
1848 kunmap_atomic(map->hva);
1852 #ifdef CONFIG_HAS_IOMEM
1856 WARN_ONCE(1, "Unexpected unmapping in atomic context");
1860 mark_page_dirty_in_slot(memslot, map->gfn);
1863 cache->dirty |= dirty;
1865 kvm_release_pfn(map->pfn, dirty, NULL);
1871 int kvm_unmap_gfn(struct kvm_vcpu *vcpu, struct kvm_host_map *map,
1872 struct gfn_to_pfn_cache *cache, bool dirty, bool atomic)
1874 __kvm_unmap_gfn(gfn_to_memslot(vcpu->kvm, map->gfn), map,
1875 cache, dirty, atomic);
1878 EXPORT_SYMBOL_GPL(kvm_unmap_gfn);
1880 void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, bool dirty)
1882 __kvm_unmap_gfn(kvm_vcpu_gfn_to_memslot(vcpu, map->gfn), map, NULL,
1885 EXPORT_SYMBOL_GPL(kvm_vcpu_unmap);
1887 struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn)
1891 pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn);
1893 return kvm_pfn_to_page(pfn);
1895 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page);
1897 void kvm_release_page_clean(struct page *page)
1899 WARN_ON(is_error_page(page));
1901 kvm_release_pfn_clean(page_to_pfn(page));
1903 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1905 void kvm_release_pfn_clean(kvm_pfn_t pfn)
1907 if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn))
1908 put_page(pfn_to_page(pfn));
1910 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1912 void kvm_release_page_dirty(struct page *page)
1914 WARN_ON(is_error_page(page));
1916 kvm_release_pfn_dirty(page_to_pfn(page));
1918 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1920 void kvm_release_pfn_dirty(kvm_pfn_t pfn)
1922 kvm_set_pfn_dirty(pfn);
1923 kvm_release_pfn_clean(pfn);
1925 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1927 void kvm_set_pfn_dirty(kvm_pfn_t pfn)
1929 if (!kvm_is_reserved_pfn(pfn) && !kvm_is_zone_device_pfn(pfn)) {
1930 struct page *page = pfn_to_page(pfn);
1932 if (!PageReserved(page))
1936 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1938 void kvm_set_pfn_accessed(kvm_pfn_t pfn)
1940 if (!kvm_is_reserved_pfn(pfn) && !kvm_is_zone_device_pfn(pfn))
1941 mark_page_accessed(pfn_to_page(pfn));
1943 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1945 void kvm_get_pfn(kvm_pfn_t pfn)
1947 if (!kvm_is_reserved_pfn(pfn))
1948 get_page(pfn_to_page(pfn));
1950 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1952 static int next_segment(unsigned long len, int offset)
1954 if (len > PAGE_SIZE - offset)
1955 return PAGE_SIZE - offset;
1960 static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn,
1961 void *data, int offset, int len)
1966 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1967 if (kvm_is_error_hva(addr))
1969 r = __copy_from_user(data, (void __user *)addr + offset, len);
1975 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1978 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1980 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1982 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1984 int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data,
1985 int offset, int len)
1987 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1989 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1991 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page);
1993 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1995 gfn_t gfn = gpa >> PAGE_SHIFT;
1997 int offset = offset_in_page(gpa);
2000 while ((seg = next_segment(len, offset)) != 0) {
2001 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
2011 EXPORT_SYMBOL_GPL(kvm_read_guest);
2013 int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len)
2015 gfn_t gfn = gpa >> PAGE_SHIFT;
2017 int offset = offset_in_page(gpa);
2020 while ((seg = next_segment(len, offset)) != 0) {
2021 ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg);
2031 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest);
2033 static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
2034 void *data, int offset, unsigned long len)
2039 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
2040 if (kvm_is_error_hva(addr))
2042 pagefault_disable();
2043 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
2050 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
2053 gfn_t gfn = gpa >> PAGE_SHIFT;
2054 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
2055 int offset = offset_in_page(gpa);
2057 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
2059 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic);
2061 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
2062 void *data, unsigned long len)
2064 gfn_t gfn = gpa >> PAGE_SHIFT;
2065 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2066 int offset = offset_in_page(gpa);
2068 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
2070 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);
2072 static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn,
2073 const void *data, int offset, int len)
2078 addr = gfn_to_hva_memslot(memslot, gfn);
2079 if (kvm_is_error_hva(addr))
2081 r = __copy_to_user((void __user *)addr + offset, data, len);
2084 mark_page_dirty_in_slot(memslot, gfn);
2088 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn,
2089 const void *data, int offset, int len)
2091 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
2093 return __kvm_write_guest_page(slot, gfn, data, offset, len);
2095 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
2097 int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
2098 const void *data, int offset, int len)
2100 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2102 return __kvm_write_guest_page(slot, gfn, data, offset, len);
2104 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page);
2106 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
2109 gfn_t gfn = gpa >> PAGE_SHIFT;
2111 int offset = offset_in_page(gpa);
2114 while ((seg = next_segment(len, offset)) != 0) {
2115 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
2125 EXPORT_SYMBOL_GPL(kvm_write_guest);
2127 int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
2130 gfn_t gfn = gpa >> PAGE_SHIFT;
2132 int offset = offset_in_page(gpa);
2135 while ((seg = next_segment(len, offset)) != 0) {
2136 ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg);
2146 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest);
2148 static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots,
2149 struct gfn_to_hva_cache *ghc,
2150 gpa_t gpa, unsigned long len)
2152 int offset = offset_in_page(gpa);
2153 gfn_t start_gfn = gpa >> PAGE_SHIFT;
2154 gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
2155 gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
2156 gfn_t nr_pages_avail;
2159 ghc->generation = slots->generation;
2161 ghc->memslot = __gfn_to_memslot(slots, start_gfn);
2162 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL);
2163 if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) {
2167 * If the requested region crosses two memslots, we still
2168 * verify that the entire region is valid here.
2170 while (start_gfn <= end_gfn) {
2172 ghc->memslot = __gfn_to_memslot(slots, start_gfn);
2173 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
2175 if (kvm_is_error_hva(ghc->hva))
2177 start_gfn += nr_pages_avail;
2179 /* Use the slow path for cross page reads and writes. */
2180 ghc->memslot = NULL;
2185 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
2186 gpa_t gpa, unsigned long len)
2188 struct kvm_memslots *slots = kvm_memslots(kvm);
2189 return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len);
2191 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
2193 int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
2194 void *data, unsigned int offset,
2197 struct kvm_memslots *slots = kvm_memslots(kvm);
2199 gpa_t gpa = ghc->gpa + offset;
2201 BUG_ON(len + offset > ghc->len);
2203 if (slots->generation != ghc->generation)
2204 __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
2206 if (kvm_is_error_hva(ghc->hva))
2209 if (unlikely(!ghc->memslot))
2210 return kvm_write_guest(kvm, gpa, data, len);
2212 r = __copy_to_user((void __user *)ghc->hva + offset, data, len);
2215 mark_page_dirty_in_slot(ghc->memslot, gpa >> PAGE_SHIFT);
2219 EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached);
2221 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
2222 void *data, unsigned long len)
2224 return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len);
2226 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
2228 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
2229 void *data, unsigned long len)
2231 struct kvm_memslots *slots = kvm_memslots(kvm);
2234 BUG_ON(len > ghc->len);
2236 if (slots->generation != ghc->generation)
2237 __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
2239 if (kvm_is_error_hva(ghc->hva))
2242 if (unlikely(!ghc->memslot))
2243 return kvm_read_guest(kvm, ghc->gpa, data, len);
2245 r = __copy_from_user(data, (void __user *)ghc->hva, len);
2251 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
2253 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
2255 const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2257 return kvm_write_guest_page(kvm, gfn, zero_page, offset, len);
2259 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
2261 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
2263 gfn_t gfn = gpa >> PAGE_SHIFT;
2265 int offset = offset_in_page(gpa);
2268 while ((seg = next_segment(len, offset)) != 0) {
2269 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
2278 EXPORT_SYMBOL_GPL(kvm_clear_guest);
2280 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot,
2283 if (memslot && memslot->dirty_bitmap) {
2284 unsigned long rel_gfn = gfn - memslot->base_gfn;
2286 set_bit_le(rel_gfn, memslot->dirty_bitmap);
2290 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
2292 struct kvm_memory_slot *memslot;
2294 memslot = gfn_to_memslot(kvm, gfn);
2295 mark_page_dirty_in_slot(memslot, gfn);
2297 EXPORT_SYMBOL_GPL(mark_page_dirty);
2299 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn)
2301 struct kvm_memory_slot *memslot;
2303 memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2304 mark_page_dirty_in_slot(memslot, gfn);
2306 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty);
2308 void kvm_sigset_activate(struct kvm_vcpu *vcpu)
2310 if (!vcpu->sigset_active)
2314 * This does a lockless modification of ->real_blocked, which is fine
2315 * because, only current can change ->real_blocked and all readers of
2316 * ->real_blocked don't care as long ->real_blocked is always a subset
2319 sigprocmask(SIG_SETMASK, &vcpu->sigset, ¤t->real_blocked);
2322 void kvm_sigset_deactivate(struct kvm_vcpu *vcpu)
2324 if (!vcpu->sigset_active)
2327 sigprocmask(SIG_SETMASK, ¤t->real_blocked, NULL);
2328 sigemptyset(¤t->real_blocked);
2331 static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
2333 unsigned int old, val, grow;
2335 old = val = vcpu->halt_poll_ns;
2336 grow = READ_ONCE(halt_poll_ns_grow);
2338 if (val == 0 && grow)
2343 if (val > halt_poll_ns)
2346 vcpu->halt_poll_ns = val;
2347 trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old);
2350 static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
2352 unsigned int old, val, shrink;
2354 old = val = vcpu->halt_poll_ns;
2355 shrink = READ_ONCE(halt_poll_ns_shrink);
2361 vcpu->halt_poll_ns = val;
2362 trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old);
2365 static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
2368 int idx = srcu_read_lock(&vcpu->kvm->srcu);
2370 if (kvm_arch_vcpu_runnable(vcpu)) {
2371 kvm_make_request(KVM_REQ_UNHALT, vcpu);
2374 if (kvm_cpu_has_pending_timer(vcpu))
2376 if (signal_pending(current))
2381 srcu_read_unlock(&vcpu->kvm->srcu, idx);
2386 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
2388 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
2391 DECLARE_SWAITQUEUE(wait);
2392 bool waited = false;
2395 start = cur = ktime_get();
2396 if (vcpu->halt_poll_ns) {
2397 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
2399 ++vcpu->stat.halt_attempted_poll;
2402 * This sets KVM_REQ_UNHALT if an interrupt
2405 if (kvm_vcpu_check_block(vcpu) < 0) {
2406 ++vcpu->stat.halt_successful_poll;
2407 if (!vcpu_valid_wakeup(vcpu))
2408 ++vcpu->stat.halt_poll_invalid;
2412 } while (single_task_running() && ktime_before(cur, stop));
2415 kvm_arch_vcpu_blocking(vcpu);
2418 prepare_to_swait_exclusive(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
2420 if (kvm_vcpu_check_block(vcpu) < 0)
2427 finish_swait(&vcpu->wq, &wait);
2430 kvm_arch_vcpu_unblocking(vcpu);
2432 block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
2434 if (!vcpu_valid_wakeup(vcpu))
2435 shrink_halt_poll_ns(vcpu);
2436 else if (halt_poll_ns) {
2437 if (block_ns <= vcpu->halt_poll_ns)
2439 /* we had a long block, shrink polling */
2440 else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns)
2441 shrink_halt_poll_ns(vcpu);
2442 /* we had a short halt and our poll time is too small */
2443 else if (vcpu->halt_poll_ns < halt_poll_ns &&
2444 block_ns < halt_poll_ns)
2445 grow_halt_poll_ns(vcpu);
2447 vcpu->halt_poll_ns = 0;
2449 trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu));
2450 kvm_arch_vcpu_block_finish(vcpu);
2452 EXPORT_SYMBOL_GPL(kvm_vcpu_block);
2454 bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
2456 struct swait_queue_head *wqp;
2458 wqp = kvm_arch_vcpu_wq(vcpu);
2459 if (swq_has_sleeper(wqp)) {
2461 ++vcpu->stat.halt_wakeup;
2467 EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up);
2471 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2473 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
2476 int cpu = vcpu->cpu;
2478 if (kvm_vcpu_wake_up(vcpu))
2482 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
2483 if (kvm_arch_vcpu_should_kick(vcpu))
2484 smp_send_reschedule(cpu);
2487 EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
2488 #endif /* !CONFIG_S390 */
2490 int kvm_vcpu_yield_to(struct kvm_vcpu *target)
2493 struct task_struct *task = NULL;
2497 pid = rcu_dereference(target->pid);
2499 task = get_pid_task(pid, PIDTYPE_PID);
2503 ret = yield_to(task, 1);
2504 put_task_struct(task);
2508 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
2511 * Helper that checks whether a VCPU is eligible for directed yield.
2512 * Most eligible candidate to yield is decided by following heuristics:
2514 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2515 * (preempted lock holder), indicated by @in_spin_loop.
2516 * Set at the beiginning and cleared at the end of interception/PLE handler.
2518 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2519 * chance last time (mostly it has become eligible now since we have probably
2520 * yielded to lockholder in last iteration. This is done by toggling
2521 * @dy_eligible each time a VCPU checked for eligibility.)
2523 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2524 * to preempted lock-holder could result in wrong VCPU selection and CPU
2525 * burning. Giving priority for a potential lock-holder increases lock
2528 * Since algorithm is based on heuristics, accessing another VCPU data without
2529 * locking does not harm. It may result in trying to yield to same VCPU, fail
2530 * and continue with next VCPU and so on.
2532 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
2534 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2537 eligible = !vcpu->spin_loop.in_spin_loop ||
2538 vcpu->spin_loop.dy_eligible;
2540 if (vcpu->spin_loop.in_spin_loop)
2541 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
2550 * Unlike kvm_arch_vcpu_runnable, this function is called outside
2551 * a vcpu_load/vcpu_put pair. However, for most architectures
2552 * kvm_arch_vcpu_runnable does not require vcpu_load.
2554 bool __weak kvm_arch_dy_runnable(struct kvm_vcpu *vcpu)
2556 return kvm_arch_vcpu_runnable(vcpu);
2559 static bool vcpu_dy_runnable(struct kvm_vcpu *vcpu)
2561 if (kvm_arch_dy_runnable(vcpu))
2564 #ifdef CONFIG_KVM_ASYNC_PF
2565 if (!list_empty_careful(&vcpu->async_pf.done))
2572 void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode)
2574 struct kvm *kvm = me->kvm;
2575 struct kvm_vcpu *vcpu;
2576 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
2582 kvm_vcpu_set_in_spin_loop(me, true);
2584 * We boost the priority of a VCPU that is runnable but not
2585 * currently running, because it got preempted by something
2586 * else and called schedule in __vcpu_run. Hopefully that
2587 * VCPU is holding the lock that we need and will release it.
2588 * We approximate round-robin by starting at the last boosted VCPU.
2590 for (pass = 0; pass < 2 && !yielded && try; pass++) {
2591 kvm_for_each_vcpu(i, vcpu, kvm) {
2592 if (!pass && i <= last_boosted_vcpu) {
2593 i = last_boosted_vcpu;
2595 } else if (pass && i > last_boosted_vcpu)
2597 if (!READ_ONCE(vcpu->preempted))
2601 if (swait_active(&vcpu->wq) && !vcpu_dy_runnable(vcpu))
2603 if (yield_to_kernel_mode && !kvm_arch_vcpu_in_kernel(vcpu))
2605 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
2608 yielded = kvm_vcpu_yield_to(vcpu);
2610 kvm->last_boosted_vcpu = i;
2612 } else if (yielded < 0) {
2619 kvm_vcpu_set_in_spin_loop(me, false);
2621 /* Ensure vcpu is not eligible during next spinloop */
2622 kvm_vcpu_set_dy_eligible(me, false);
2624 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
2626 static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf)
2628 struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data;
2631 if (vmf->pgoff == 0)
2632 page = virt_to_page(vcpu->run);
2634 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
2635 page = virt_to_page(vcpu->arch.pio_data);
2637 #ifdef CONFIG_KVM_MMIO
2638 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
2639 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
2642 return kvm_arch_vcpu_fault(vcpu, vmf);
2648 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
2649 .fault = kvm_vcpu_fault,
2652 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2654 vma->vm_ops = &kvm_vcpu_vm_ops;
2658 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2660 struct kvm_vcpu *vcpu = filp->private_data;
2662 debugfs_remove_recursive(vcpu->debugfs_dentry);
2663 kvm_put_kvm(vcpu->kvm);
2667 static struct file_operations kvm_vcpu_fops = {
2668 .release = kvm_vcpu_release,
2669 .unlocked_ioctl = kvm_vcpu_ioctl,
2670 .mmap = kvm_vcpu_mmap,
2671 .llseek = noop_llseek,
2672 KVM_COMPAT(kvm_vcpu_compat_ioctl),
2676 * Allocates an inode for the vcpu.
2678 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2680 char name[8 + 1 + ITOA_MAX_LEN + 1];
2682 snprintf(name, sizeof(name), "kvm-vcpu:%d", vcpu->vcpu_id);
2683 return anon_inode_getfd(name, &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
2686 static int kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
2688 char dir_name[ITOA_MAX_LEN * 2];
2691 if (!kvm_arch_has_vcpu_debugfs())
2694 if (!debugfs_initialized())
2697 snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id);
2698 vcpu->debugfs_dentry = debugfs_create_dir(dir_name,
2699 vcpu->kvm->debugfs_dentry);
2700 if (!vcpu->debugfs_dentry)
2703 ret = kvm_arch_create_vcpu_debugfs(vcpu);
2705 debugfs_remove_recursive(vcpu->debugfs_dentry);
2713 * Creates some virtual cpus. Good luck creating more than one.
2715 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
2718 struct kvm_vcpu *vcpu;
2720 if (id >= KVM_MAX_VCPU_ID)
2723 mutex_lock(&kvm->lock);
2724 if (kvm->created_vcpus == KVM_MAX_VCPUS) {
2725 mutex_unlock(&kvm->lock);
2729 kvm->created_vcpus++;
2730 mutex_unlock(&kvm->lock);
2732 vcpu = kvm_arch_vcpu_create(kvm, id);
2735 goto vcpu_decrement;
2738 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2740 r = kvm_arch_vcpu_setup(vcpu);
2744 r = kvm_create_vcpu_debugfs(vcpu);
2748 mutex_lock(&kvm->lock);
2749 if (kvm_get_vcpu_by_id(kvm, id)) {
2751 goto unlock_vcpu_destroy;
2754 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
2756 /* Now it's all set up, let userspace reach it */
2758 r = create_vcpu_fd(vcpu);
2761 goto unlock_vcpu_destroy;
2764 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
2767 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2768 * before kvm->online_vcpu's incremented value.
2771 atomic_inc(&kvm->online_vcpus);
2773 mutex_unlock(&kvm->lock);
2774 kvm_arch_vcpu_postcreate(vcpu);
2777 unlock_vcpu_destroy:
2778 mutex_unlock(&kvm->lock);
2779 debugfs_remove_recursive(vcpu->debugfs_dentry);
2781 kvm_arch_vcpu_destroy(vcpu);
2783 mutex_lock(&kvm->lock);
2784 kvm->created_vcpus--;
2785 mutex_unlock(&kvm->lock);
2789 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2792 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2793 vcpu->sigset_active = 1;
2794 vcpu->sigset = *sigset;
2796 vcpu->sigset_active = 0;
2800 static long kvm_vcpu_ioctl(struct file *filp,
2801 unsigned int ioctl, unsigned long arg)
2803 struct kvm_vcpu *vcpu = filp->private_data;
2804 void __user *argp = (void __user *)arg;
2806 struct kvm_fpu *fpu = NULL;
2807 struct kvm_sregs *kvm_sregs = NULL;
2809 if (vcpu->kvm->mm != current->mm)
2812 if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
2816 * Some architectures have vcpu ioctls that are asynchronous to vcpu
2817 * execution; mutex_lock() would break them.
2819 r = kvm_arch_vcpu_async_ioctl(filp, ioctl, arg);
2820 if (r != -ENOIOCTLCMD)
2823 if (mutex_lock_killable(&vcpu->mutex))
2831 oldpid = rcu_access_pointer(vcpu->pid);
2832 if (unlikely(oldpid != task_pid(current))) {
2833 /* The thread running this VCPU changed. */
2836 r = kvm_arch_vcpu_run_pid_change(vcpu);
2840 newpid = get_task_pid(current, PIDTYPE_PID);
2841 rcu_assign_pointer(vcpu->pid, newpid);
2846 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
2847 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
2850 case KVM_GET_REGS: {
2851 struct kvm_regs *kvm_regs;
2854 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
2857 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
2861 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
2868 case KVM_SET_REGS: {
2869 struct kvm_regs *kvm_regs;
2872 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
2873 if (IS_ERR(kvm_regs)) {
2874 r = PTR_ERR(kvm_regs);
2877 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2881 case KVM_GET_SREGS: {
2882 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
2886 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2890 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2895 case KVM_SET_SREGS: {
2896 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2897 if (IS_ERR(kvm_sregs)) {
2898 r = PTR_ERR(kvm_sregs);
2902 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2905 case KVM_GET_MP_STATE: {
2906 struct kvm_mp_state mp_state;
2908 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2912 if (copy_to_user(argp, &mp_state, sizeof(mp_state)))
2917 case KVM_SET_MP_STATE: {
2918 struct kvm_mp_state mp_state;
2921 if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
2923 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2926 case KVM_TRANSLATE: {
2927 struct kvm_translation tr;
2930 if (copy_from_user(&tr, argp, sizeof(tr)))
2932 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2936 if (copy_to_user(argp, &tr, sizeof(tr)))
2941 case KVM_SET_GUEST_DEBUG: {
2942 struct kvm_guest_debug dbg;
2945 if (copy_from_user(&dbg, argp, sizeof(dbg)))
2947 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2950 case KVM_SET_SIGNAL_MASK: {
2951 struct kvm_signal_mask __user *sigmask_arg = argp;
2952 struct kvm_signal_mask kvm_sigmask;
2953 sigset_t sigset, *p;
2958 if (copy_from_user(&kvm_sigmask, argp,
2959 sizeof(kvm_sigmask)))
2962 if (kvm_sigmask.len != sizeof(sigset))
2965 if (copy_from_user(&sigset, sigmask_arg->sigset,
2970 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2974 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2978 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2982 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2988 fpu = memdup_user(argp, sizeof(*fpu));
2994 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2998 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
3001 mutex_unlock(&vcpu->mutex);
3007 #ifdef CONFIG_KVM_COMPAT
3008 static long kvm_vcpu_compat_ioctl(struct file *filp,
3009 unsigned int ioctl, unsigned long arg)
3011 struct kvm_vcpu *vcpu = filp->private_data;
3012 void __user *argp = compat_ptr(arg);
3015 if (vcpu->kvm->mm != current->mm)
3019 case KVM_SET_SIGNAL_MASK: {
3020 struct kvm_signal_mask __user *sigmask_arg = argp;
3021 struct kvm_signal_mask kvm_sigmask;
3026 if (copy_from_user(&kvm_sigmask, argp,
3027 sizeof(kvm_sigmask)))
3030 if (kvm_sigmask.len != sizeof(compat_sigset_t))
3033 if (get_compat_sigset(&sigset, (void *)sigmask_arg->sigset))
3035 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
3037 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
3041 r = kvm_vcpu_ioctl(filp, ioctl, arg);
3049 static int kvm_device_ioctl_attr(struct kvm_device *dev,
3050 int (*accessor)(struct kvm_device *dev,
3051 struct kvm_device_attr *attr),
3054 struct kvm_device_attr attr;
3059 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
3062 return accessor(dev, &attr);
3065 static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
3068 struct kvm_device *dev = filp->private_data;
3070 if (dev->kvm->mm != current->mm)
3074 case KVM_SET_DEVICE_ATTR:
3075 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
3076 case KVM_GET_DEVICE_ATTR:
3077 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
3078 case KVM_HAS_DEVICE_ATTR:
3079 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
3081 if (dev->ops->ioctl)
3082 return dev->ops->ioctl(dev, ioctl, arg);
3088 static int kvm_device_release(struct inode *inode, struct file *filp)
3090 struct kvm_device *dev = filp->private_data;
3091 struct kvm *kvm = dev->kvm;
3097 static const struct file_operations kvm_device_fops = {
3098 .unlocked_ioctl = kvm_device_ioctl,
3099 .release = kvm_device_release,
3100 KVM_COMPAT(kvm_device_ioctl),
3103 struct kvm_device *kvm_device_from_filp(struct file *filp)
3105 if (filp->f_op != &kvm_device_fops)
3108 return filp->private_data;
3111 static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
3112 #ifdef CONFIG_KVM_MPIC
3113 [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops,
3114 [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops,
3118 int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
3120 if (type >= ARRAY_SIZE(kvm_device_ops_table))
3123 if (kvm_device_ops_table[type] != NULL)
3126 kvm_device_ops_table[type] = ops;
3130 void kvm_unregister_device_ops(u32 type)
3132 if (kvm_device_ops_table[type] != NULL)
3133 kvm_device_ops_table[type] = NULL;
3136 static int kvm_ioctl_create_device(struct kvm *kvm,
3137 struct kvm_create_device *cd)
3139 struct kvm_device_ops *ops = NULL;
3140 struct kvm_device *dev;
3141 bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
3145 if (cd->type >= ARRAY_SIZE(kvm_device_ops_table))
3148 type = array_index_nospec(cd->type, ARRAY_SIZE(kvm_device_ops_table));
3149 ops = kvm_device_ops_table[type];
3156 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3163 mutex_lock(&kvm->lock);
3164 ret = ops->create(dev, type);
3166 mutex_unlock(&kvm->lock);
3170 list_add(&dev->vm_node, &kvm->devices);
3171 mutex_unlock(&kvm->lock);
3177 ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC);
3180 mutex_lock(&kvm->lock);
3181 list_del(&dev->vm_node);
3182 mutex_unlock(&kvm->lock);
3191 static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
3194 case KVM_CAP_USER_MEMORY:
3195 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
3196 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
3197 case KVM_CAP_INTERNAL_ERROR_DATA:
3198 #ifdef CONFIG_HAVE_KVM_MSI
3199 case KVM_CAP_SIGNAL_MSI:
3201 #ifdef CONFIG_HAVE_KVM_IRQFD
3203 case KVM_CAP_IRQFD_RESAMPLE:
3205 case KVM_CAP_IOEVENTFD_ANY_LENGTH:
3206 case KVM_CAP_CHECK_EXTENSION_VM:
3208 #ifdef CONFIG_KVM_MMIO
3209 case KVM_CAP_COALESCED_MMIO:
3210 return KVM_COALESCED_MMIO_PAGE_OFFSET;
3212 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3213 case KVM_CAP_IRQ_ROUTING:
3214 return KVM_MAX_IRQ_ROUTES;
3216 #if KVM_ADDRESS_SPACE_NUM > 1
3217 case KVM_CAP_MULTI_ADDRESS_SPACE:
3218 return KVM_ADDRESS_SPACE_NUM;
3223 return kvm_vm_ioctl_check_extension(kvm, arg);
3226 static long kvm_vm_ioctl(struct file *filp,
3227 unsigned int ioctl, unsigned long arg)
3229 struct kvm *kvm = filp->private_data;
3230 void __user *argp = (void __user *)arg;
3233 if (kvm->mm != current->mm)
3236 case KVM_CREATE_VCPU:
3237 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
3239 case KVM_SET_USER_MEMORY_REGION: {
3240 struct kvm_userspace_memory_region kvm_userspace_mem;
3243 if (copy_from_user(&kvm_userspace_mem, argp,
3244 sizeof(kvm_userspace_mem)))
3247 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
3250 case KVM_GET_DIRTY_LOG: {
3251 struct kvm_dirty_log log;
3254 if (copy_from_user(&log, argp, sizeof(log)))
3256 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3259 #ifdef CONFIG_KVM_MMIO
3260 case KVM_REGISTER_COALESCED_MMIO: {
3261 struct kvm_coalesced_mmio_zone zone;
3264 if (copy_from_user(&zone, argp, sizeof(zone)))
3266 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
3269 case KVM_UNREGISTER_COALESCED_MMIO: {
3270 struct kvm_coalesced_mmio_zone zone;
3273 if (copy_from_user(&zone, argp, sizeof(zone)))
3275 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
3280 struct kvm_irqfd data;
3283 if (copy_from_user(&data, argp, sizeof(data)))
3285 r = kvm_irqfd(kvm, &data);
3288 case KVM_IOEVENTFD: {
3289 struct kvm_ioeventfd data;
3292 if (copy_from_user(&data, argp, sizeof(data)))
3294 r = kvm_ioeventfd(kvm, &data);
3297 #ifdef CONFIG_HAVE_KVM_MSI
3298 case KVM_SIGNAL_MSI: {
3302 if (copy_from_user(&msi, argp, sizeof(msi)))
3304 r = kvm_send_userspace_msi(kvm, &msi);
3308 #ifdef __KVM_HAVE_IRQ_LINE
3309 case KVM_IRQ_LINE_STATUS:
3310 case KVM_IRQ_LINE: {
3311 struct kvm_irq_level irq_event;
3314 if (copy_from_user(&irq_event, argp, sizeof(irq_event)))
3317 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
3318 ioctl == KVM_IRQ_LINE_STATUS);
3323 if (ioctl == KVM_IRQ_LINE_STATUS) {
3324 if (copy_to_user(argp, &irq_event, sizeof(irq_event)))
3332 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3333 case KVM_SET_GSI_ROUTING: {
3334 struct kvm_irq_routing routing;
3335 struct kvm_irq_routing __user *urouting;
3336 struct kvm_irq_routing_entry *entries = NULL;
3339 if (copy_from_user(&routing, argp, sizeof(routing)))
3342 if (!kvm_arch_can_set_irq_routing(kvm))
3344 if (routing.nr > KVM_MAX_IRQ_ROUTES)
3350 entries = vmalloc(array_size(sizeof(*entries),
3356 if (copy_from_user(entries, urouting->entries,
3357 routing.nr * sizeof(*entries)))
3358 goto out_free_irq_routing;
3360 r = kvm_set_irq_routing(kvm, entries, routing.nr,
3362 out_free_irq_routing:
3366 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
3367 case KVM_CREATE_DEVICE: {
3368 struct kvm_create_device cd;
3371 if (copy_from_user(&cd, argp, sizeof(cd)))
3374 r = kvm_ioctl_create_device(kvm, &cd);
3379 if (copy_to_user(argp, &cd, sizeof(cd)))
3385 case KVM_CHECK_EXTENSION:
3386 r = kvm_vm_ioctl_check_extension_generic(kvm, arg);
3389 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
3395 #ifdef CONFIG_KVM_COMPAT
3396 struct compat_kvm_dirty_log {
3400 compat_uptr_t dirty_bitmap; /* one bit per page */
3405 static long kvm_vm_compat_ioctl(struct file *filp,
3406 unsigned int ioctl, unsigned long arg)
3408 struct kvm *kvm = filp->private_data;
3411 if (kvm->mm != current->mm)
3414 case KVM_GET_DIRTY_LOG: {
3415 struct compat_kvm_dirty_log compat_log;
3416 struct kvm_dirty_log log;
3418 if (copy_from_user(&compat_log, (void __user *)arg,
3419 sizeof(compat_log)))
3421 log.slot = compat_log.slot;
3422 log.padding1 = compat_log.padding1;
3423 log.padding2 = compat_log.padding2;
3424 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
3426 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3430 r = kvm_vm_ioctl(filp, ioctl, arg);
3436 static struct file_operations kvm_vm_fops = {
3437 .release = kvm_vm_release,
3438 .unlocked_ioctl = kvm_vm_ioctl,
3439 .llseek = noop_llseek,
3440 KVM_COMPAT(kvm_vm_compat_ioctl),
3443 static int kvm_dev_ioctl_create_vm(unsigned long type)
3449 kvm = kvm_create_vm(type);
3451 return PTR_ERR(kvm);
3452 #ifdef CONFIG_KVM_MMIO
3453 r = kvm_coalesced_mmio_init(kvm);
3457 r = get_unused_fd_flags(O_CLOEXEC);
3461 file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
3469 * Don't call kvm_put_kvm anymore at this point; file->f_op is
3470 * already set, with ->release() being kvm_vm_release(). In error
3471 * cases it will be called by the final fput(file) and will take
3472 * care of doing kvm_put_kvm(kvm).
3474 if (kvm_create_vm_debugfs(kvm, r) < 0) {
3479 kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm);
3481 fd_install(r, file);
3489 static long kvm_dev_ioctl(struct file *filp,
3490 unsigned int ioctl, unsigned long arg)
3495 case KVM_GET_API_VERSION:
3498 r = KVM_API_VERSION;
3501 r = kvm_dev_ioctl_create_vm(arg);
3503 case KVM_CHECK_EXTENSION:
3504 r = kvm_vm_ioctl_check_extension_generic(NULL, arg);
3506 case KVM_GET_VCPU_MMAP_SIZE:
3509 r = PAGE_SIZE; /* struct kvm_run */
3511 r += PAGE_SIZE; /* pio data page */
3513 #ifdef CONFIG_KVM_MMIO
3514 r += PAGE_SIZE; /* coalesced mmio ring page */
3517 case KVM_TRACE_ENABLE:
3518 case KVM_TRACE_PAUSE:
3519 case KVM_TRACE_DISABLE:
3523 return kvm_arch_dev_ioctl(filp, ioctl, arg);
3529 static struct file_operations kvm_chardev_ops = {
3530 .unlocked_ioctl = kvm_dev_ioctl,
3531 .llseek = noop_llseek,
3532 KVM_COMPAT(kvm_dev_ioctl),
3535 static struct miscdevice kvm_dev = {
3541 static void hardware_enable_nolock(void *junk)
3543 int cpu = raw_smp_processor_id();
3546 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
3549 cpumask_set_cpu(cpu, cpus_hardware_enabled);
3551 r = kvm_arch_hardware_enable();
3554 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3555 atomic_inc(&hardware_enable_failed);
3556 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu);
3560 static int kvm_starting_cpu(unsigned int cpu)
3562 raw_spin_lock(&kvm_count_lock);
3563 if (kvm_usage_count)
3564 hardware_enable_nolock(NULL);
3565 raw_spin_unlock(&kvm_count_lock);
3569 static void hardware_disable_nolock(void *junk)
3571 int cpu = raw_smp_processor_id();
3573 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
3575 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3576 kvm_arch_hardware_disable();
3579 static int kvm_dying_cpu(unsigned int cpu)
3581 raw_spin_lock(&kvm_count_lock);
3582 if (kvm_usage_count)
3583 hardware_disable_nolock(NULL);
3584 raw_spin_unlock(&kvm_count_lock);
3588 static void hardware_disable_all_nolock(void)
3590 BUG_ON(!kvm_usage_count);
3593 if (!kvm_usage_count)
3594 on_each_cpu(hardware_disable_nolock, NULL, 1);
3597 static void hardware_disable_all(void)
3599 raw_spin_lock(&kvm_count_lock);
3600 hardware_disable_all_nolock();
3601 raw_spin_unlock(&kvm_count_lock);
3604 static int hardware_enable_all(void)
3608 raw_spin_lock(&kvm_count_lock);
3611 if (kvm_usage_count == 1) {
3612 atomic_set(&hardware_enable_failed, 0);
3613 on_each_cpu(hardware_enable_nolock, NULL, 1);
3615 if (atomic_read(&hardware_enable_failed)) {
3616 hardware_disable_all_nolock();
3621 raw_spin_unlock(&kvm_count_lock);
3626 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3630 * Some (well, at least mine) BIOSes hang on reboot if
3633 * And Intel TXT required VMX off for all cpu when system shutdown.
3635 pr_info("kvm: exiting hardware virtualization\n");
3636 kvm_rebooting = true;
3637 on_each_cpu(hardware_disable_nolock, NULL, 1);
3641 static struct notifier_block kvm_reboot_notifier = {
3642 .notifier_call = kvm_reboot,
3646 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3650 for (i = 0; i < bus->dev_count; i++) {
3651 struct kvm_io_device *pos = bus->range[i].dev;
3653 kvm_iodevice_destructor(pos);
3658 static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
3659 const struct kvm_io_range *r2)
3661 gpa_t addr1 = r1->addr;
3662 gpa_t addr2 = r2->addr;
3667 /* If r2->len == 0, match the exact address. If r2->len != 0,
3668 * accept any overlapping write. Any order is acceptable for
3669 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3670 * we process all of them.
3683 static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
3685 return kvm_io_bus_cmp(p1, p2);
3688 static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
3689 gpa_t addr, int len)
3691 struct kvm_io_range *range, key;
3694 key = (struct kvm_io_range) {
3699 range = bsearch(&key, bus->range, bus->dev_count,
3700 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
3704 off = range - bus->range;
3706 while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0)
3712 static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3713 struct kvm_io_range *range, const void *val)
3717 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3721 while (idx < bus->dev_count &&
3722 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3723 if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr,
3732 /* kvm_io_bus_write - called under kvm->slots_lock */
3733 int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3734 int len, const void *val)
3736 struct kvm_io_bus *bus;
3737 struct kvm_io_range range;
3740 range = (struct kvm_io_range) {
3745 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3748 r = __kvm_io_bus_write(vcpu, bus, &range, val);
3749 return r < 0 ? r : 0;
3752 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3753 int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
3754 gpa_t addr, int len, const void *val, long cookie)
3756 struct kvm_io_bus *bus;
3757 struct kvm_io_range range;
3759 range = (struct kvm_io_range) {
3764 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3768 /* First try the device referenced by cookie. */
3769 if ((cookie >= 0) && (cookie < bus->dev_count) &&
3770 (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
3771 if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len,
3776 * cookie contained garbage; fall back to search and return the
3777 * correct cookie value.
3779 return __kvm_io_bus_write(vcpu, bus, &range, val);
3782 static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3783 struct kvm_io_range *range, void *val)
3787 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3791 while (idx < bus->dev_count &&
3792 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3793 if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr,
3801 EXPORT_SYMBOL_GPL(kvm_io_bus_write);
3803 /* kvm_io_bus_read - called under kvm->slots_lock */
3804 int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3807 struct kvm_io_bus *bus;
3808 struct kvm_io_range range;
3811 range = (struct kvm_io_range) {
3816 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3819 r = __kvm_io_bus_read(vcpu, bus, &range, val);
3820 return r < 0 ? r : 0;
3824 /* Caller must hold slots_lock. */
3825 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
3826 int len, struct kvm_io_device *dev)
3829 struct kvm_io_bus *new_bus, *bus;
3830 struct kvm_io_range range;
3832 bus = kvm_get_bus(kvm, bus_idx);
3836 /* exclude ioeventfd which is limited by maximum fd */
3837 if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
3840 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) *
3841 sizeof(struct kvm_io_range)), GFP_KERNEL);
3845 range = (struct kvm_io_range) {
3851 for (i = 0; i < bus->dev_count; i++)
3852 if (kvm_io_bus_cmp(&bus->range[i], &range) > 0)
3855 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3856 new_bus->dev_count++;
3857 new_bus->range[i] = range;
3858 memcpy(new_bus->range + i + 1, bus->range + i,
3859 (bus->dev_count - i) * sizeof(struct kvm_io_range));
3860 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3861 synchronize_srcu_expedited(&kvm->srcu);
3867 /* Caller must hold slots_lock. */
3868 void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3869 struct kvm_io_device *dev)
3872 struct kvm_io_bus *new_bus, *bus;
3874 bus = kvm_get_bus(kvm, bus_idx);
3878 for (i = 0; i < bus->dev_count; i++)
3879 if (bus->range[i].dev == dev) {
3883 if (i == bus->dev_count)
3886 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) *
3887 sizeof(struct kvm_io_range)), GFP_KERNEL);
3889 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3890 new_bus->dev_count--;
3891 memcpy(new_bus->range + i, bus->range + i + 1,
3892 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
3894 pr_err("kvm: failed to shrink bus, removing it completely\n");
3895 for (j = 0; j < bus->dev_count; j++) {
3898 kvm_iodevice_destructor(bus->range[j].dev);
3902 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3903 synchronize_srcu_expedited(&kvm->srcu);
3908 struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3911 struct kvm_io_bus *bus;
3912 int dev_idx, srcu_idx;
3913 struct kvm_io_device *iodev = NULL;
3915 srcu_idx = srcu_read_lock(&kvm->srcu);
3917 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
3921 dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1);
3925 iodev = bus->range[dev_idx].dev;
3928 srcu_read_unlock(&kvm->srcu, srcu_idx);
3932 EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev);
3934 static int kvm_debugfs_open(struct inode *inode, struct file *file,
3935 int (*get)(void *, u64 *), int (*set)(void *, u64),
3938 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3941 /* The debugfs files are a reference to the kvm struct which
3942 * is still valid when kvm_destroy_vm is called.
3943 * To avoid the race between open and the removal of the debugfs
3944 * directory we test against the users count.
3946 if (!refcount_inc_not_zero(&stat_data->kvm->users_count))
3949 if (simple_attr_open(inode, file, get,
3950 stat_data->mode & S_IWUGO ? set : NULL,
3952 kvm_put_kvm(stat_data->kvm);
3959 static int kvm_debugfs_release(struct inode *inode, struct file *file)
3961 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3964 simple_attr_release(inode, file);
3965 kvm_put_kvm(stat_data->kvm);
3970 static int vm_stat_get_per_vm(void *data, u64 *val)
3972 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3974 *val = *(ulong *)((void *)stat_data->kvm + stat_data->offset);
3979 static int vm_stat_clear_per_vm(void *data, u64 val)
3981 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3986 *(ulong *)((void *)stat_data->kvm + stat_data->offset) = 0;
3991 static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file)
3993 __simple_attr_check_format("%llu\n", 0ull);
3994 return kvm_debugfs_open(inode, file, vm_stat_get_per_vm,
3995 vm_stat_clear_per_vm, "%llu\n");
3998 static const struct file_operations vm_stat_get_per_vm_fops = {
3999 .owner = THIS_MODULE,
4000 .open = vm_stat_get_per_vm_open,
4001 .release = kvm_debugfs_release,
4002 .read = simple_attr_read,
4003 .write = simple_attr_write,
4004 .llseek = no_llseek,
4007 static int vcpu_stat_get_per_vm(void *data, u64 *val)
4010 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
4011 struct kvm_vcpu *vcpu;
4015 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
4016 *val += *(u64 *)((void *)vcpu + stat_data->offset);
4021 static int vcpu_stat_clear_per_vm(void *data, u64 val)
4024 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
4025 struct kvm_vcpu *vcpu;
4030 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
4031 *(u64 *)((void *)vcpu + stat_data->offset) = 0;
4036 static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file)
4038 __simple_attr_check_format("%llu\n", 0ull);
4039 return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm,
4040 vcpu_stat_clear_per_vm, "%llu\n");
4043 static const struct file_operations vcpu_stat_get_per_vm_fops = {
4044 .owner = THIS_MODULE,
4045 .open = vcpu_stat_get_per_vm_open,
4046 .release = kvm_debugfs_release,
4047 .read = simple_attr_read,
4048 .write = simple_attr_write,
4049 .llseek = no_llseek,
4052 static const struct file_operations *stat_fops_per_vm[] = {
4053 [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops,
4054 [KVM_STAT_VM] = &vm_stat_get_per_vm_fops,
4057 static int vm_stat_get(void *_offset, u64 *val)
4059 unsigned offset = (long)_offset;
4061 struct kvm_stat_data stat_tmp = {.offset = offset};
4065 mutex_lock(&kvm_lock);
4066 list_for_each_entry(kvm, &vm_list, vm_list) {
4068 vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
4071 mutex_unlock(&kvm_lock);
4075 static int vm_stat_clear(void *_offset, u64 val)
4077 unsigned offset = (long)_offset;
4079 struct kvm_stat_data stat_tmp = {.offset = offset};
4084 mutex_lock(&kvm_lock);
4085 list_for_each_entry(kvm, &vm_list, vm_list) {
4087 vm_stat_clear_per_vm((void *)&stat_tmp, 0);
4089 mutex_unlock(&kvm_lock);
4094 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n");
4096 static int vcpu_stat_get(void *_offset, u64 *val)
4098 unsigned offset = (long)_offset;
4100 struct kvm_stat_data stat_tmp = {.offset = offset};
4104 mutex_lock(&kvm_lock);
4105 list_for_each_entry(kvm, &vm_list, vm_list) {
4107 vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
4110 mutex_unlock(&kvm_lock);
4114 static int vcpu_stat_clear(void *_offset, u64 val)
4116 unsigned offset = (long)_offset;
4118 struct kvm_stat_data stat_tmp = {.offset = offset};
4123 mutex_lock(&kvm_lock);
4124 list_for_each_entry(kvm, &vm_list, vm_list) {
4126 vcpu_stat_clear_per_vm((void *)&stat_tmp, 0);
4128 mutex_unlock(&kvm_lock);
4133 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear,
4136 static const struct file_operations *stat_fops[] = {
4137 [KVM_STAT_VCPU] = &vcpu_stat_fops,
4138 [KVM_STAT_VM] = &vm_stat_fops,
4141 static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
4143 struct kobj_uevent_env *env;
4144 unsigned long long created, active;
4146 if (!kvm_dev.this_device || !kvm)
4149 mutex_lock(&kvm_lock);
4150 if (type == KVM_EVENT_CREATE_VM) {
4151 kvm_createvm_count++;
4153 } else if (type == KVM_EVENT_DESTROY_VM) {
4156 created = kvm_createvm_count;
4157 active = kvm_active_vms;
4158 mutex_unlock(&kvm_lock);
4160 env = kzalloc(sizeof(*env), GFP_KERNEL);
4164 add_uevent_var(env, "CREATED=%llu", created);
4165 add_uevent_var(env, "COUNT=%llu", active);
4167 if (type == KVM_EVENT_CREATE_VM) {
4168 add_uevent_var(env, "EVENT=create");
4169 kvm->userspace_pid = task_pid_nr(current);
4170 } else if (type == KVM_EVENT_DESTROY_VM) {
4171 add_uevent_var(env, "EVENT=destroy");
4173 add_uevent_var(env, "PID=%d", kvm->userspace_pid);
4175 if (!IS_ERR_OR_NULL(kvm->debugfs_dentry)) {
4176 char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL);
4179 tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX);
4181 add_uevent_var(env, "STATS_PATH=%s", tmp);
4185 /* no need for checks, since we are adding at most only 5 keys */
4186 env->envp[env->envp_idx++] = NULL;
4187 kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp);
4191 static void kvm_init_debug(void)
4193 struct kvm_stats_debugfs_item *p;
4195 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
4197 kvm_debugfs_num_entries = 0;
4198 for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) {
4199 int mode = p->mode ? p->mode : 0644;
4200 debugfs_create_file(p->name, mode, kvm_debugfs_dir,
4201 (void *)(long)p->offset,
4202 stat_fops[p->kind]);
4206 static int kvm_suspend(void)
4208 if (kvm_usage_count)
4209 hardware_disable_nolock(NULL);
4213 static void kvm_resume(void)
4215 if (kvm_usage_count) {
4216 WARN_ON(raw_spin_is_locked(&kvm_count_lock));
4217 hardware_enable_nolock(NULL);
4221 static struct syscore_ops kvm_syscore_ops = {
4222 .suspend = kvm_suspend,
4223 .resume = kvm_resume,
4227 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
4229 return container_of(pn, struct kvm_vcpu, preempt_notifier);
4232 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
4234 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
4236 if (vcpu->preempted)
4237 vcpu->preempted = false;
4239 kvm_arch_sched_in(vcpu, cpu);
4241 kvm_arch_vcpu_load(vcpu, cpu);
4244 static void kvm_sched_out(struct preempt_notifier *pn,
4245 struct task_struct *next)
4247 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
4249 if (current->state == TASK_RUNNING)
4250 vcpu->preempted = true;
4251 kvm_arch_vcpu_put(vcpu);
4254 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
4255 struct module *module)
4260 r = kvm_arch_init(opaque);
4265 * kvm_arch_init makes sure there's at most one caller
4266 * for architectures that support multiple implementations,
4267 * like intel and amd on x86.
4268 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
4269 * conflicts in case kvm is already setup for another implementation.
4271 r = kvm_irqfd_init();
4275 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
4280 r = kvm_arch_hardware_setup();
4284 for_each_online_cpu(cpu) {
4285 smp_call_function_single(cpu,
4286 kvm_arch_check_processor_compat,
4292 r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting",
4293 kvm_starting_cpu, kvm_dying_cpu);
4296 register_reboot_notifier(&kvm_reboot_notifier);
4298 /* A kmem cache lets us meet the alignment requirements of fx_save. */
4300 vcpu_align = __alignof__(struct kvm_vcpu);
4302 kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align,
4304 offsetof(struct kvm_vcpu, arch),
4305 sizeof_field(struct kvm_vcpu, arch),
4307 if (!kvm_vcpu_cache) {
4312 r = kvm_async_pf_init();
4316 kvm_chardev_ops.owner = module;
4317 kvm_vm_fops.owner = module;
4318 kvm_vcpu_fops.owner = module;
4320 r = misc_register(&kvm_dev);
4322 pr_err("kvm: misc device register failed\n");
4326 register_syscore_ops(&kvm_syscore_ops);
4328 kvm_preempt_ops.sched_in = kvm_sched_in;
4329 kvm_preempt_ops.sched_out = kvm_sched_out;
4333 r = kvm_vfio_ops_init();
4339 kvm_async_pf_deinit();
4341 kmem_cache_destroy(kvm_vcpu_cache);
4343 unregister_reboot_notifier(&kvm_reboot_notifier);
4344 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
4347 kvm_arch_hardware_unsetup();
4349 free_cpumask_var(cpus_hardware_enabled);
4357 EXPORT_SYMBOL_GPL(kvm_init);
4361 debugfs_remove_recursive(kvm_debugfs_dir);
4362 misc_deregister(&kvm_dev);
4363 kmem_cache_destroy(kvm_vcpu_cache);
4364 kvm_async_pf_deinit();
4365 unregister_syscore_ops(&kvm_syscore_ops);
4366 unregister_reboot_notifier(&kvm_reboot_notifier);
4367 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
4368 on_each_cpu(hardware_disable_nolock, NULL, 1);
4369 kvm_arch_hardware_unsetup();
4372 free_cpumask_var(cpus_hardware_enabled);
4373 kvm_vfio_ops_exit();
4375 EXPORT_SYMBOL_GPL(kvm_exit);
4377 struct kvm_vm_worker_thread_context {
4379 struct task_struct *parent;
4380 struct completion init_done;
4381 kvm_vm_thread_fn_t thread_fn;
4386 static int kvm_vm_worker_thread(void *context)
4389 * The init_context is allocated on the stack of the parent thread, so
4390 * we have to locally copy anything that is needed beyond initialization
4392 struct kvm_vm_worker_thread_context *init_context = context;
4393 struct kvm *kvm = init_context->kvm;
4394 kvm_vm_thread_fn_t thread_fn = init_context->thread_fn;
4395 uintptr_t data = init_context->data;
4398 err = kthread_park(current);
4399 /* kthread_park(current) is never supposed to return an error */
4404 err = cgroup_attach_task_all(init_context->parent, current);
4406 kvm_err("%s: cgroup_attach_task_all failed with err %d\n",
4411 set_user_nice(current, task_nice(init_context->parent));
4414 init_context->err = err;
4415 complete(&init_context->init_done);
4416 init_context = NULL;
4421 /* Wait to be woken up by the spawner before proceeding. */
4424 if (!kthread_should_stop())
4425 err = thread_fn(kvm, data);
4430 int kvm_vm_create_worker_thread(struct kvm *kvm, kvm_vm_thread_fn_t thread_fn,
4431 uintptr_t data, const char *name,
4432 struct task_struct **thread_ptr)
4434 struct kvm_vm_worker_thread_context init_context = {};
4435 struct task_struct *thread;
4438 init_context.kvm = kvm;
4439 init_context.parent = current;
4440 init_context.thread_fn = thread_fn;
4441 init_context.data = data;
4442 init_completion(&init_context.init_done);
4444 thread = kthread_run(kvm_vm_worker_thread, &init_context,
4445 "%s-%d", name, task_pid_nr(current));
4447 return PTR_ERR(thread);
4449 /* kthread_run is never supposed to return NULL */
4450 WARN_ON(thread == NULL);
4452 wait_for_completion(&init_context.init_done);
4454 if (!init_context.err)
4455 *thread_ptr = thread;
4457 return init_context.err;