1 // SPDX-License-Identifier: GPL-2.0-only
3 * Kernel-based Virtual Machine driver for Linux
5 * This module enables machines with Intel VT-x extensions to run virtual
6 * machines without emulation or binary translation.
8 * Copyright (C) 2006 Qumranet, Inc.
9 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
12 * Avi Kivity <avi@qumranet.com>
13 * Yaniv Kamay <yaniv@qumranet.com>
16 #include <kvm/iodev.h>
18 #include <linux/kvm_host.h>
19 #include <linux/kvm.h>
20 #include <linux/module.h>
21 #include <linux/errno.h>
22 #include <linux/percpu.h>
24 #include <linux/miscdevice.h>
25 #include <linux/vmalloc.h>
26 #include <linux/reboot.h>
27 #include <linux/debugfs.h>
28 #include <linux/highmem.h>
29 #include <linux/file.h>
30 #include <linux/syscore_ops.h>
31 #include <linux/cpu.h>
32 #include <linux/sched/signal.h>
33 #include <linux/sched/mm.h>
34 #include <linux/sched/stat.h>
35 #include <linux/cpumask.h>
36 #include <linux/smp.h>
37 #include <linux/anon_inodes.h>
38 #include <linux/profile.h>
39 #include <linux/kvm_para.h>
40 #include <linux/pagemap.h>
41 #include <linux/mman.h>
42 #include <linux/swap.h>
43 #include <linux/bitops.h>
44 #include <linux/spinlock.h>
45 #include <linux/compat.h>
46 #include <linux/srcu.h>
47 #include <linux/hugetlb.h>
48 #include <linux/slab.h>
49 #include <linux/sort.h>
50 #include <linux/bsearch.h>
52 #include <linux/lockdep.h>
54 #include <asm/processor.h>
55 #include <asm/ioctl.h>
56 #include <linux/uaccess.h>
57 #include <asm/pgtable.h>
59 #include "coalesced_mmio.h"
63 #define CREATE_TRACE_POINTS
64 #include <trace/events/kvm.h>
66 /* Worst case buffer size needed for holding an integer. */
67 #define ITOA_MAX_LEN 12
69 MODULE_AUTHOR("Qumranet");
70 MODULE_LICENSE("GPL");
72 /* Architectures should define their poll value according to the halt latency */
73 unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT;
74 module_param(halt_poll_ns, uint, 0644);
75 EXPORT_SYMBOL_GPL(halt_poll_ns);
77 /* Default doubles per-vcpu halt_poll_ns. */
78 unsigned int halt_poll_ns_grow = 2;
79 module_param(halt_poll_ns_grow, uint, 0644);
80 EXPORT_SYMBOL_GPL(halt_poll_ns_grow);
82 /* The start value to grow halt_poll_ns from */
83 unsigned int halt_poll_ns_grow_start = 10000; /* 10us */
84 module_param(halt_poll_ns_grow_start, uint, 0644);
85 EXPORT_SYMBOL_GPL(halt_poll_ns_grow_start);
87 /* Default resets per-vcpu halt_poll_ns . */
88 unsigned int halt_poll_ns_shrink;
89 module_param(halt_poll_ns_shrink, uint, 0644);
90 EXPORT_SYMBOL_GPL(halt_poll_ns_shrink);
95 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
98 DEFINE_MUTEX(kvm_lock);
99 static DEFINE_RAW_SPINLOCK(kvm_count_lock);
102 static cpumask_var_t cpus_hardware_enabled;
103 static int kvm_usage_count;
104 static atomic_t hardware_enable_failed;
106 struct kmem_cache *kvm_vcpu_cache;
107 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
109 static __read_mostly struct preempt_ops kvm_preempt_ops;
111 struct dentry *kvm_debugfs_dir;
112 EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
114 static int kvm_debugfs_num_entries;
115 static const struct file_operations *stat_fops_per_vm[];
117 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
119 #ifdef CONFIG_KVM_COMPAT
120 static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
122 #define KVM_COMPAT(c) .compat_ioctl = (c)
124 static long kvm_no_compat_ioctl(struct file *file, unsigned int ioctl,
125 unsigned long arg) { return -EINVAL; }
126 #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl
128 static int hardware_enable_all(void);
129 static void hardware_disable_all(void);
131 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
133 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn);
135 __visible bool kvm_rebooting;
136 EXPORT_SYMBOL_GPL(kvm_rebooting);
138 static bool largepages_enabled = true;
140 #define KVM_EVENT_CREATE_VM 0
141 #define KVM_EVENT_DESTROY_VM 1
142 static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm);
143 static unsigned long long kvm_createvm_count;
144 static unsigned long long kvm_active_vms;
146 __weak int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
147 unsigned long start, unsigned long end, bool blockable)
152 bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
155 return PageReserved(pfn_to_page(pfn));
161 * Switches to specified vcpu, until a matching vcpu_put()
163 void vcpu_load(struct kvm_vcpu *vcpu)
166 preempt_notifier_register(&vcpu->preempt_notifier);
167 kvm_arch_vcpu_load(vcpu, cpu);
170 EXPORT_SYMBOL_GPL(vcpu_load);
172 void vcpu_put(struct kvm_vcpu *vcpu)
175 kvm_arch_vcpu_put(vcpu);
176 preempt_notifier_unregister(&vcpu->preempt_notifier);
179 EXPORT_SYMBOL_GPL(vcpu_put);
181 /* TODO: merge with kvm_arch_vcpu_should_kick */
182 static bool kvm_request_needs_ipi(struct kvm_vcpu *vcpu, unsigned req)
184 int mode = kvm_vcpu_exiting_guest_mode(vcpu);
187 * We need to wait for the VCPU to reenable interrupts and get out of
188 * READING_SHADOW_PAGE_TABLES mode.
190 if (req & KVM_REQUEST_WAIT)
191 return mode != OUTSIDE_GUEST_MODE;
194 * Need to kick a running VCPU, but otherwise there is nothing to do.
196 return mode == IN_GUEST_MODE;
199 static void ack_flush(void *_completed)
203 static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait)
206 cpus = cpu_online_mask;
208 if (cpumask_empty(cpus))
211 smp_call_function_many(cpus, ack_flush, NULL, wait);
215 bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
216 unsigned long *vcpu_bitmap, cpumask_var_t tmp)
219 struct kvm_vcpu *vcpu;
224 kvm_for_each_vcpu(i, vcpu, kvm) {
225 if (vcpu_bitmap && !test_bit(i, vcpu_bitmap))
228 kvm_make_request(req, vcpu);
231 if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu))
234 if (tmp != NULL && cpu != -1 && cpu != me &&
235 kvm_request_needs_ipi(vcpu, req))
236 __cpumask_set_cpu(cpu, tmp);
239 called = kvm_kick_many_cpus(tmp, !!(req & KVM_REQUEST_WAIT));
245 bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
250 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
252 called = kvm_make_vcpus_request_mask(kvm, req, NULL, cpus);
254 free_cpumask_var(cpus);
258 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
259 void kvm_flush_remote_tlbs(struct kvm *kvm)
262 * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
263 * kvm_make_all_cpus_request.
265 long dirty_count = smp_load_acquire(&kvm->tlbs_dirty);
268 * We want to publish modifications to the page tables before reading
269 * mode. Pairs with a memory barrier in arch-specific code.
270 * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest
271 * and smp_mb in walk_shadow_page_lockless_begin/end.
272 * - powerpc: smp_mb in kvmppc_prepare_to_enter.
274 * There is already an smp_mb__after_atomic() before
275 * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
278 if (!kvm_arch_flush_remote_tlb(kvm)
279 || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
280 ++kvm->stat.remote_tlb_flush;
281 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
283 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
286 void kvm_reload_remote_mmus(struct kvm *kvm)
288 kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
291 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
296 mutex_init(&vcpu->mutex);
301 init_swait_queue_head(&vcpu->wq);
302 kvm_async_pf_vcpu_init(vcpu);
305 INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
307 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
312 vcpu->run = page_address(page);
314 kvm_vcpu_set_in_spin_loop(vcpu, false);
315 kvm_vcpu_set_dy_eligible(vcpu, false);
316 vcpu->preempted = false;
319 r = kvm_arch_vcpu_init(vcpu);
325 free_page((unsigned long)vcpu->run);
329 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
331 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
334 * no need for rcu_read_lock as VCPU_RUN is the only place that
335 * will change the vcpu->pid pointer and on uninit all file
336 * descriptors are already gone.
338 put_pid(rcu_dereference_protected(vcpu->pid, 1));
339 kvm_arch_vcpu_uninit(vcpu);
340 free_page((unsigned long)vcpu->run);
342 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
344 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
345 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
347 return container_of(mn, struct kvm, mmu_notifier);
350 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
351 struct mm_struct *mm,
352 unsigned long address,
355 struct kvm *kvm = mmu_notifier_to_kvm(mn);
358 idx = srcu_read_lock(&kvm->srcu);
359 spin_lock(&kvm->mmu_lock);
360 kvm->mmu_notifier_seq++;
362 if (kvm_set_spte_hva(kvm, address, pte))
363 kvm_flush_remote_tlbs(kvm);
365 spin_unlock(&kvm->mmu_lock);
366 srcu_read_unlock(&kvm->srcu, idx);
369 static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
370 const struct mmu_notifier_range *range)
372 struct kvm *kvm = mmu_notifier_to_kvm(mn);
373 int need_tlb_flush = 0, idx;
376 idx = srcu_read_lock(&kvm->srcu);
377 spin_lock(&kvm->mmu_lock);
379 * The count increase must become visible at unlock time as no
380 * spte can be established without taking the mmu_lock and
381 * count is also read inside the mmu_lock critical section.
383 kvm->mmu_notifier_count++;
384 need_tlb_flush = kvm_unmap_hva_range(kvm, range->start, range->end);
385 need_tlb_flush |= kvm->tlbs_dirty;
386 /* we've to flush the tlb before the pages can be freed */
388 kvm_flush_remote_tlbs(kvm);
390 spin_unlock(&kvm->mmu_lock);
392 ret = kvm_arch_mmu_notifier_invalidate_range(kvm, range->start,
394 mmu_notifier_range_blockable(range));
396 srcu_read_unlock(&kvm->srcu, idx);
401 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
402 const struct mmu_notifier_range *range)
404 struct kvm *kvm = mmu_notifier_to_kvm(mn);
406 spin_lock(&kvm->mmu_lock);
408 * This sequence increase will notify the kvm page fault that
409 * the page that is going to be mapped in the spte could have
412 kvm->mmu_notifier_seq++;
415 * The above sequence increase must be visible before the
416 * below count decrease, which is ensured by the smp_wmb above
417 * in conjunction with the smp_rmb in mmu_notifier_retry().
419 kvm->mmu_notifier_count--;
420 spin_unlock(&kvm->mmu_lock);
422 BUG_ON(kvm->mmu_notifier_count < 0);
425 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
426 struct mm_struct *mm,
430 struct kvm *kvm = mmu_notifier_to_kvm(mn);
433 idx = srcu_read_lock(&kvm->srcu);
434 spin_lock(&kvm->mmu_lock);
436 young = kvm_age_hva(kvm, start, end);
438 kvm_flush_remote_tlbs(kvm);
440 spin_unlock(&kvm->mmu_lock);
441 srcu_read_unlock(&kvm->srcu, idx);
446 static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
447 struct mm_struct *mm,
451 struct kvm *kvm = mmu_notifier_to_kvm(mn);
454 idx = srcu_read_lock(&kvm->srcu);
455 spin_lock(&kvm->mmu_lock);
457 * Even though we do not flush TLB, this will still adversely
458 * affect performance on pre-Haswell Intel EPT, where there is
459 * no EPT Access Bit to clear so that we have to tear down EPT
460 * tables instead. If we find this unacceptable, we can always
461 * add a parameter to kvm_age_hva so that it effectively doesn't
462 * do anything on clear_young.
464 * Also note that currently we never issue secondary TLB flushes
465 * from clear_young, leaving this job up to the regular system
466 * cadence. If we find this inaccurate, we might come up with a
467 * more sophisticated heuristic later.
469 young = kvm_age_hva(kvm, start, end);
470 spin_unlock(&kvm->mmu_lock);
471 srcu_read_unlock(&kvm->srcu, idx);
476 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
477 struct mm_struct *mm,
478 unsigned long address)
480 struct kvm *kvm = mmu_notifier_to_kvm(mn);
483 idx = srcu_read_lock(&kvm->srcu);
484 spin_lock(&kvm->mmu_lock);
485 young = kvm_test_age_hva(kvm, address);
486 spin_unlock(&kvm->mmu_lock);
487 srcu_read_unlock(&kvm->srcu, idx);
492 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
493 struct mm_struct *mm)
495 struct kvm *kvm = mmu_notifier_to_kvm(mn);
498 idx = srcu_read_lock(&kvm->srcu);
499 kvm_arch_flush_shadow_all(kvm);
500 srcu_read_unlock(&kvm->srcu, idx);
503 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
504 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
505 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
506 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
507 .clear_young = kvm_mmu_notifier_clear_young,
508 .test_young = kvm_mmu_notifier_test_young,
509 .change_pte = kvm_mmu_notifier_change_pte,
510 .release = kvm_mmu_notifier_release,
513 static int kvm_init_mmu_notifier(struct kvm *kvm)
515 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
516 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
519 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
521 static int kvm_init_mmu_notifier(struct kvm *kvm)
526 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
528 static struct kvm_memslots *kvm_alloc_memslots(void)
531 struct kvm_memslots *slots;
533 slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT);
537 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
538 slots->id_to_index[i] = slots->memslots[i].id = i;
543 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
545 if (!memslot->dirty_bitmap)
548 kvfree(memslot->dirty_bitmap);
549 memslot->dirty_bitmap = NULL;
553 * Free any memory in @free but not in @dont.
555 static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
556 struct kvm_memory_slot *dont)
558 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
559 kvm_destroy_dirty_bitmap(free);
561 kvm_arch_free_memslot(kvm, free, dont);
566 static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
568 struct kvm_memory_slot *memslot;
573 kvm_for_each_memslot(memslot, slots)
574 kvm_free_memslot(kvm, memslot, NULL);
579 static void kvm_destroy_vm_debugfs(struct kvm *kvm)
583 if (!kvm->debugfs_dentry)
586 debugfs_remove_recursive(kvm->debugfs_dentry);
588 if (kvm->debugfs_stat_data) {
589 for (i = 0; i < kvm_debugfs_num_entries; i++)
590 kfree(kvm->debugfs_stat_data[i]);
591 kfree(kvm->debugfs_stat_data);
595 static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
597 char dir_name[ITOA_MAX_LEN * 2];
598 struct kvm_stat_data *stat_data;
599 struct kvm_stats_debugfs_item *p;
601 if (!debugfs_initialized())
604 snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd);
605 kvm->debugfs_dentry = debugfs_create_dir(dir_name, kvm_debugfs_dir);
607 kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries,
608 sizeof(*kvm->debugfs_stat_data),
610 if (!kvm->debugfs_stat_data)
613 for (p = debugfs_entries; p->name; p++) {
614 stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL_ACCOUNT);
618 stat_data->kvm = kvm;
619 stat_data->offset = p->offset;
620 kvm->debugfs_stat_data[p - debugfs_entries] = stat_data;
621 debugfs_create_file(p->name, 0644, kvm->debugfs_dentry,
622 stat_data, stat_fops_per_vm[p->kind]);
627 static struct kvm *kvm_create_vm(unsigned long type)
630 struct kvm *kvm = kvm_arch_alloc_vm();
633 return ERR_PTR(-ENOMEM);
635 spin_lock_init(&kvm->mmu_lock);
637 kvm->mm = current->mm;
638 kvm_eventfd_init(kvm);
639 mutex_init(&kvm->lock);
640 mutex_init(&kvm->irq_lock);
641 mutex_init(&kvm->slots_lock);
642 refcount_set(&kvm->users_count, 1);
643 INIT_LIST_HEAD(&kvm->devices);
645 r = kvm_arch_init_vm(kvm, type);
647 goto out_err_no_disable;
649 r = hardware_enable_all();
651 goto out_err_no_disable;
653 #ifdef CONFIG_HAVE_KVM_IRQFD
654 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
657 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
660 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
661 struct kvm_memslots *slots = kvm_alloc_memslots();
663 goto out_err_no_srcu;
664 /* Generations must be different for each address space. */
665 slots->generation = i;
666 rcu_assign_pointer(kvm->memslots[i], slots);
669 if (init_srcu_struct(&kvm->srcu))
670 goto out_err_no_srcu;
671 if (init_srcu_struct(&kvm->irq_srcu))
672 goto out_err_no_irq_srcu;
673 for (i = 0; i < KVM_NR_BUSES; i++) {
674 rcu_assign_pointer(kvm->buses[i],
675 kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL_ACCOUNT));
680 r = kvm_init_mmu_notifier(kvm);
684 mutex_lock(&kvm_lock);
685 list_add(&kvm->vm_list, &vm_list);
686 mutex_unlock(&kvm_lock);
688 preempt_notifier_inc();
693 cleanup_srcu_struct(&kvm->irq_srcu);
695 cleanup_srcu_struct(&kvm->srcu);
697 hardware_disable_all();
699 refcount_set(&kvm->users_count, 0);
700 for (i = 0; i < KVM_NR_BUSES; i++)
701 kfree(kvm_get_bus(kvm, i));
702 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
703 kvm_free_memslots(kvm, __kvm_memslots(kvm, i));
704 kvm_arch_free_vm(kvm);
709 static void kvm_destroy_devices(struct kvm *kvm)
711 struct kvm_device *dev, *tmp;
714 * We do not need to take the kvm->lock here, because nobody else
715 * has a reference to the struct kvm at this point and therefore
716 * cannot access the devices list anyhow.
718 list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) {
719 list_del(&dev->vm_node);
720 dev->ops->destroy(dev);
724 static void kvm_destroy_vm(struct kvm *kvm)
727 struct mm_struct *mm = kvm->mm;
729 kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm);
730 kvm_destroy_vm_debugfs(kvm);
731 kvm_arch_sync_events(kvm);
732 mutex_lock(&kvm_lock);
733 list_del(&kvm->vm_list);
734 mutex_unlock(&kvm_lock);
735 kvm_free_irq_routing(kvm);
736 for (i = 0; i < KVM_NR_BUSES; i++) {
737 struct kvm_io_bus *bus = kvm_get_bus(kvm, i);
740 kvm_io_bus_destroy(bus);
741 kvm->buses[i] = NULL;
743 kvm_coalesced_mmio_free(kvm);
744 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
745 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
747 kvm_arch_flush_shadow_all(kvm);
749 kvm_arch_destroy_vm(kvm);
750 kvm_destroy_devices(kvm);
751 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
752 kvm_free_memslots(kvm, __kvm_memslots(kvm, i));
753 cleanup_srcu_struct(&kvm->irq_srcu);
754 cleanup_srcu_struct(&kvm->srcu);
755 kvm_arch_free_vm(kvm);
756 preempt_notifier_dec();
757 hardware_disable_all();
761 void kvm_get_kvm(struct kvm *kvm)
763 refcount_inc(&kvm->users_count);
765 EXPORT_SYMBOL_GPL(kvm_get_kvm);
767 void kvm_put_kvm(struct kvm *kvm)
769 if (refcount_dec_and_test(&kvm->users_count))
772 EXPORT_SYMBOL_GPL(kvm_put_kvm);
775 static int kvm_vm_release(struct inode *inode, struct file *filp)
777 struct kvm *kvm = filp->private_data;
779 kvm_irqfd_release(kvm);
786 * Allocation size is twice as large as the actual dirty bitmap size.
787 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
789 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
791 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
793 memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL_ACCOUNT);
794 if (!memslot->dirty_bitmap)
801 * Insert memslot and re-sort memslots based on their GFN,
802 * so binary search could be used to lookup GFN.
803 * Sorting algorithm takes advantage of having initially
804 * sorted array and known changed memslot position.
806 static void update_memslots(struct kvm_memslots *slots,
807 struct kvm_memory_slot *new,
808 enum kvm_mr_change change)
811 int i = slots->id_to_index[id];
812 struct kvm_memory_slot *mslots = slots->memslots;
814 WARN_ON(mslots[i].id != id);
818 WARN_ON(mslots[i].npages || !new->npages);
822 WARN_ON(new->npages || !mslots[i].npages);
828 while (i < KVM_MEM_SLOTS_NUM - 1 &&
829 new->base_gfn <= mslots[i + 1].base_gfn) {
830 if (!mslots[i + 1].npages)
832 mslots[i] = mslots[i + 1];
833 slots->id_to_index[mslots[i].id] = i;
838 * The ">=" is needed when creating a slot with base_gfn == 0,
839 * so that it moves before all those with base_gfn == npages == 0.
841 * On the other hand, if new->npages is zero, the above loop has
842 * already left i pointing to the beginning of the empty part of
843 * mslots, and the ">=" would move the hole backwards in this
844 * case---which is wrong. So skip the loop when deleting a slot.
848 new->base_gfn >= mslots[i - 1].base_gfn) {
849 mslots[i] = mslots[i - 1];
850 slots->id_to_index[mslots[i].id] = i;
854 WARN_ON_ONCE(i != slots->used_slots);
857 slots->id_to_index[mslots[i].id] = i;
860 static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem)
862 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
864 #ifdef __KVM_HAVE_READONLY_MEM
865 valid_flags |= KVM_MEM_READONLY;
868 if (mem->flags & ~valid_flags)
874 static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
875 int as_id, struct kvm_memslots *slots)
877 struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id);
878 u64 gen = old_memslots->generation;
880 WARN_ON(gen & KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS);
881 slots->generation = gen | KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS;
883 rcu_assign_pointer(kvm->memslots[as_id], slots);
884 synchronize_srcu_expedited(&kvm->srcu);
887 * Increment the new memslot generation a second time, dropping the
888 * update in-progress flag and incrementing then generation based on
889 * the number of address spaces. This provides a unique and easily
890 * identifiable generation number while the memslots are in flux.
892 gen = slots->generation & ~KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS;
895 * Generations must be unique even across address spaces. We do not need
896 * a global counter for that, instead the generation space is evenly split
897 * across address spaces. For example, with two address spaces, address
898 * space 0 will use generations 0, 2, 4, ... while address space 1 will
899 * use generations 1, 3, 5, ...
901 gen += KVM_ADDRESS_SPACE_NUM;
903 kvm_arch_memslots_updated(kvm, gen);
905 slots->generation = gen;
911 * Allocate some memory and give it an address in the guest physical address
914 * Discontiguous memory is allowed, mostly for framebuffers.
916 * Must be called holding kvm->slots_lock for write.
918 int __kvm_set_memory_region(struct kvm *kvm,
919 const struct kvm_userspace_memory_region *mem)
923 unsigned long npages;
924 struct kvm_memory_slot *slot;
925 struct kvm_memory_slot old, new;
926 struct kvm_memslots *slots = NULL, *old_memslots;
928 enum kvm_mr_change change;
930 r = check_memory_region_flags(mem);
935 as_id = mem->slot >> 16;
938 /* General sanity checks */
939 if (mem->memory_size & (PAGE_SIZE - 1))
941 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
943 /* We can read the guest memory with __xxx_user() later on. */
944 if ((id < KVM_USER_MEM_SLOTS) &&
945 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
946 !access_ok((void __user *)(unsigned long)mem->userspace_addr,
949 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM)
951 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
954 slot = id_to_memslot(__kvm_memslots(kvm, as_id), id);
955 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
956 npages = mem->memory_size >> PAGE_SHIFT;
958 if (npages > KVM_MEM_MAX_NR_PAGES)
964 new.base_gfn = base_gfn;
966 new.flags = mem->flags;
970 change = KVM_MR_CREATE;
971 else { /* Modify an existing slot. */
972 if ((mem->userspace_addr != old.userspace_addr) ||
973 (npages != old.npages) ||
974 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
977 if (base_gfn != old.base_gfn)
978 change = KVM_MR_MOVE;
979 else if (new.flags != old.flags)
980 change = KVM_MR_FLAGS_ONLY;
981 else { /* Nothing to change. */
990 change = KVM_MR_DELETE;
995 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
996 /* Check for overlaps */
998 kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) {
1001 if (!((base_gfn + npages <= slot->base_gfn) ||
1002 (base_gfn >= slot->base_gfn + slot->npages)))
1007 /* Free page dirty bitmap if unneeded */
1008 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
1009 new.dirty_bitmap = NULL;
1012 if (change == KVM_MR_CREATE) {
1013 new.userspace_addr = mem->userspace_addr;
1015 if (kvm_arch_create_memslot(kvm, &new, npages))
1019 /* Allocate page dirty bitmap if needed */
1020 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
1021 if (kvm_create_dirty_bitmap(&new) < 0)
1025 slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT);
1028 memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots));
1030 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
1031 slot = id_to_memslot(slots, id);
1032 slot->flags |= KVM_MEMSLOT_INVALID;
1034 old_memslots = install_new_memslots(kvm, as_id, slots);
1036 /* From this point no new shadow pages pointing to a deleted,
1037 * or moved, memslot will be created.
1039 * validation of sp->gfn happens in:
1040 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
1041 * - kvm_is_visible_gfn (mmu_check_roots)
1043 kvm_arch_flush_shadow_memslot(kvm, slot);
1046 * We can re-use the old_memslots from above, the only difference
1047 * from the currently installed memslots is the invalid flag. This
1048 * will get overwritten by update_memslots anyway.
1050 slots = old_memslots;
1053 r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
1057 /* actual memory is freed via old in kvm_free_memslot below */
1058 if (change == KVM_MR_DELETE) {
1059 new.dirty_bitmap = NULL;
1060 memset(&new.arch, 0, sizeof(new.arch));
1063 update_memslots(slots, &new, change);
1064 old_memslots = install_new_memslots(kvm, as_id, slots);
1066 kvm_arch_commit_memory_region(kvm, mem, &old, &new, change);
1068 kvm_free_memslot(kvm, &old, &new);
1069 kvfree(old_memslots);
1075 kvm_free_memslot(kvm, &new, &old);
1079 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
1081 int kvm_set_memory_region(struct kvm *kvm,
1082 const struct kvm_userspace_memory_region *mem)
1086 mutex_lock(&kvm->slots_lock);
1087 r = __kvm_set_memory_region(kvm, mem);
1088 mutex_unlock(&kvm->slots_lock);
1091 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1093 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1094 struct kvm_userspace_memory_region *mem)
1096 if ((u16)mem->slot >= KVM_USER_MEM_SLOTS)
1099 return kvm_set_memory_region(kvm, mem);
1102 int kvm_get_dirty_log(struct kvm *kvm,
1103 struct kvm_dirty_log *log, int *is_dirty)
1105 struct kvm_memslots *slots;
1106 struct kvm_memory_slot *memslot;
1109 unsigned long any = 0;
1111 as_id = log->slot >> 16;
1112 id = (u16)log->slot;
1113 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1116 slots = __kvm_memslots(kvm, as_id);
1117 memslot = id_to_memslot(slots, id);
1118 if (!memslot->dirty_bitmap)
1121 n = kvm_dirty_bitmap_bytes(memslot);
1123 for (i = 0; !any && i < n/sizeof(long); ++i)
1124 any = memslot->dirty_bitmap[i];
1126 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1133 EXPORT_SYMBOL_GPL(kvm_get_dirty_log);
1135 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1137 * kvm_get_dirty_log_protect - get a snapshot of dirty pages
1138 * and reenable dirty page tracking for the corresponding pages.
1139 * @kvm: pointer to kvm instance
1140 * @log: slot id and address to which we copy the log
1141 * @flush: true if TLB flush is needed by caller
1143 * We need to keep it in mind that VCPU threads can write to the bitmap
1144 * concurrently. So, to avoid losing track of dirty pages we keep the
1147 * 1. Take a snapshot of the bit and clear it if needed.
1148 * 2. Write protect the corresponding page.
1149 * 3. Copy the snapshot to the userspace.
1150 * 4. Upon return caller flushes TLB's if needed.
1152 * Between 2 and 4, the guest may write to the page using the remaining TLB
1153 * entry. This is not a problem because the page is reported dirty using
1154 * the snapshot taken before and step 4 ensures that writes done after
1155 * exiting to userspace will be logged for the next call.
1158 int kvm_get_dirty_log_protect(struct kvm *kvm,
1159 struct kvm_dirty_log *log, bool *flush)
1161 struct kvm_memslots *slots;
1162 struct kvm_memory_slot *memslot;
1165 unsigned long *dirty_bitmap;
1166 unsigned long *dirty_bitmap_buffer;
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);
1176 dirty_bitmap = memslot->dirty_bitmap;
1180 n = kvm_dirty_bitmap_bytes(memslot);
1182 if (kvm->manual_dirty_log_protect) {
1184 * Unlike kvm_get_dirty_log, we always return false in *flush,
1185 * because no flush is needed until KVM_CLEAR_DIRTY_LOG. There
1186 * is some code duplication between this function and
1187 * kvm_get_dirty_log, but hopefully all architecture
1188 * transition to kvm_get_dirty_log_protect and kvm_get_dirty_log
1189 * can be eliminated.
1191 dirty_bitmap_buffer = dirty_bitmap;
1193 dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot);
1194 memset(dirty_bitmap_buffer, 0, n);
1196 spin_lock(&kvm->mmu_lock);
1197 for (i = 0; i < n / sizeof(long); i++) {
1201 if (!dirty_bitmap[i])
1205 mask = xchg(&dirty_bitmap[i], 0);
1206 dirty_bitmap_buffer[i] = mask;
1208 offset = i * BITS_PER_LONG;
1209 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
1212 spin_unlock(&kvm->mmu_lock);
1215 if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
1219 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect);
1222 * kvm_clear_dirty_log_protect - clear dirty bits in the bitmap
1223 * and reenable dirty page tracking for the corresponding pages.
1224 * @kvm: pointer to kvm instance
1225 * @log: slot id and address from which to fetch the bitmap of dirty pages
1226 * @flush: true if TLB flush is needed by caller
1228 int kvm_clear_dirty_log_protect(struct kvm *kvm,
1229 struct kvm_clear_dirty_log *log, bool *flush)
1231 struct kvm_memslots *slots;
1232 struct kvm_memory_slot *memslot;
1236 unsigned long *dirty_bitmap;
1237 unsigned long *dirty_bitmap_buffer;
1239 as_id = log->slot >> 16;
1240 id = (u16)log->slot;
1241 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1244 if (log->first_page & 63)
1247 slots = __kvm_memslots(kvm, as_id);
1248 memslot = id_to_memslot(slots, id);
1250 dirty_bitmap = memslot->dirty_bitmap;
1254 n = ALIGN(log->num_pages, BITS_PER_LONG) / 8;
1256 if (log->first_page > memslot->npages ||
1257 log->num_pages > memslot->npages - log->first_page ||
1258 (log->num_pages < memslot->npages - log->first_page && (log->num_pages & 63)))
1262 dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot);
1263 if (copy_from_user(dirty_bitmap_buffer, log->dirty_bitmap, n))
1266 spin_lock(&kvm->mmu_lock);
1267 for (offset = log->first_page, i = offset / BITS_PER_LONG,
1268 n = DIV_ROUND_UP(log->num_pages, BITS_PER_LONG); n--;
1269 i++, offset += BITS_PER_LONG) {
1270 unsigned long mask = *dirty_bitmap_buffer++;
1271 atomic_long_t *p = (atomic_long_t *) &dirty_bitmap[i];
1275 mask &= atomic_long_fetch_andnot(mask, p);
1278 * mask contains the bits that really have been cleared. This
1279 * never includes any bits beyond the length of the memslot (if
1280 * the length is not aligned to 64 pages), therefore it is not
1281 * a problem if userspace sets them in log->dirty_bitmap.
1285 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
1289 spin_unlock(&kvm->mmu_lock);
1293 EXPORT_SYMBOL_GPL(kvm_clear_dirty_log_protect);
1296 bool kvm_largepages_enabled(void)
1298 return largepages_enabled;
1301 void kvm_disable_largepages(void)
1303 largepages_enabled = false;
1305 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
1307 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1309 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1311 EXPORT_SYMBOL_GPL(gfn_to_memslot);
1313 struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn)
1315 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn);
1318 bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1320 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1322 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
1323 memslot->flags & KVM_MEMSLOT_INVALID)
1328 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1330 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1332 struct vm_area_struct *vma;
1333 unsigned long addr, size;
1337 addr = gfn_to_hva(kvm, gfn);
1338 if (kvm_is_error_hva(addr))
1341 down_read(¤t->mm->mmap_sem);
1342 vma = find_vma(current->mm, addr);
1346 size = vma_kernel_pagesize(vma);
1349 up_read(¤t->mm->mmap_sem);
1354 static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1356 return slot->flags & KVM_MEM_READONLY;
1359 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1360 gfn_t *nr_pages, bool write)
1362 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1363 return KVM_HVA_ERR_BAD;
1365 if (memslot_is_readonly(slot) && write)
1366 return KVM_HVA_ERR_RO_BAD;
1369 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1371 return __gfn_to_hva_memslot(slot, gfn);
1374 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1377 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1380 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1383 return gfn_to_hva_many(slot, gfn, NULL);
1385 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1387 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1389 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1391 EXPORT_SYMBOL_GPL(gfn_to_hva);
1393 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn)
1395 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL);
1397 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva);
1400 * Return the hva of a @gfn and the R/W attribute if possible.
1402 * @slot: the kvm_memory_slot which contains @gfn
1403 * @gfn: the gfn to be translated
1404 * @writable: used to return the read/write attribute of the @slot if the hva
1405 * is valid and @writable is not NULL
1407 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot,
1408 gfn_t gfn, bool *writable)
1410 unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false);
1412 if (!kvm_is_error_hva(hva) && writable)
1413 *writable = !memslot_is_readonly(slot);
1418 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
1420 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1422 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1425 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable)
1427 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1429 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1432 static inline int check_user_page_hwpoison(unsigned long addr)
1434 int rc, flags = FOLL_HWPOISON | FOLL_WRITE;
1436 rc = get_user_pages(addr, 1, flags, NULL, NULL);
1437 return rc == -EHWPOISON;
1441 * The fast path to get the writable pfn which will be stored in @pfn,
1442 * true indicates success, otherwise false is returned. It's also the
1443 * only part that runs if we can are in atomic context.
1445 static bool hva_to_pfn_fast(unsigned long addr, bool write_fault,
1446 bool *writable, kvm_pfn_t *pfn)
1448 struct page *page[1];
1452 * Fast pin a writable pfn only if it is a write fault request
1453 * or the caller allows to map a writable pfn for a read fault
1456 if (!(write_fault || writable))
1459 npages = __get_user_pages_fast(addr, 1, 1, page);
1461 *pfn = page_to_pfn(page[0]);
1472 * The slow path to get the pfn of the specified host virtual address,
1473 * 1 indicates success, -errno is returned if error is detected.
1475 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1476 bool *writable, kvm_pfn_t *pfn)
1478 unsigned int flags = FOLL_HWPOISON;
1485 *writable = write_fault;
1488 flags |= FOLL_WRITE;
1490 flags |= FOLL_NOWAIT;
1492 npages = get_user_pages_unlocked(addr, 1, &page, flags);
1496 /* map read fault as writable if possible */
1497 if (unlikely(!write_fault) && writable) {
1500 if (__get_user_pages_fast(addr, 1, 1, &wpage) == 1) {
1506 *pfn = page_to_pfn(page);
1510 static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1512 if (unlikely(!(vma->vm_flags & VM_READ)))
1515 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1521 static int hva_to_pfn_remapped(struct vm_area_struct *vma,
1522 unsigned long addr, bool *async,
1523 bool write_fault, bool *writable,
1529 r = follow_pfn(vma, addr, &pfn);
1532 * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
1533 * not call the fault handler, so do it here.
1535 bool unlocked = false;
1536 r = fixup_user_fault(current, current->mm, addr,
1537 (write_fault ? FAULT_FLAG_WRITE : 0),
1544 r = follow_pfn(vma, addr, &pfn);
1554 * Get a reference here because callers of *hva_to_pfn* and
1555 * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the
1556 * returned pfn. This is only needed if the VMA has VM_MIXEDMAP
1557 * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will
1558 * simply do nothing for reserved pfns.
1560 * Whoever called remap_pfn_range is also going to call e.g.
1561 * unmap_mapping_range before the underlying pages are freed,
1562 * causing a call to our MMU notifier.
1571 * Pin guest page in memory and return its pfn.
1572 * @addr: host virtual address which maps memory to the guest
1573 * @atomic: whether this function can sleep
1574 * @async: whether this function need to wait IO complete if the
1575 * host page is not in the memory
1576 * @write_fault: whether we should get a writable host page
1577 * @writable: whether it allows to map a writable host page for !@write_fault
1579 * The function will map a writable host page for these two cases:
1580 * 1): @write_fault = true
1581 * 2): @write_fault = false && @writable, @writable will tell the caller
1582 * whether the mapping is writable.
1584 static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1585 bool write_fault, bool *writable)
1587 struct vm_area_struct *vma;
1591 /* we can do it either atomically or asynchronously, not both */
1592 BUG_ON(atomic && async);
1594 if (hva_to_pfn_fast(addr, write_fault, writable, &pfn))
1598 return KVM_PFN_ERR_FAULT;
1600 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1604 down_read(¤t->mm->mmap_sem);
1605 if (npages == -EHWPOISON ||
1606 (!async && check_user_page_hwpoison(addr))) {
1607 pfn = KVM_PFN_ERR_HWPOISON;
1612 vma = find_vma_intersection(current->mm, addr, addr + 1);
1615 pfn = KVM_PFN_ERR_FAULT;
1616 else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) {
1617 r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn);
1621 pfn = KVM_PFN_ERR_FAULT;
1623 if (async && vma_is_valid(vma, write_fault))
1625 pfn = KVM_PFN_ERR_FAULT;
1628 up_read(¤t->mm->mmap_sem);
1632 kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
1633 bool atomic, bool *async, bool write_fault,
1636 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1638 if (addr == KVM_HVA_ERR_RO_BAD) {
1641 return KVM_PFN_ERR_RO_FAULT;
1644 if (kvm_is_error_hva(addr)) {
1647 return KVM_PFN_NOSLOT;
1650 /* Do not map writable pfn in the readonly memslot. */
1651 if (writable && memslot_is_readonly(slot)) {
1656 return hva_to_pfn(addr, atomic, async, write_fault,
1659 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot);
1661 kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1664 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL,
1665 write_fault, writable);
1667 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1669 kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1671 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1673 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot);
1675 kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1677 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1679 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1681 kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1683 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn);
1685 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1687 kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn)
1689 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1691 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic);
1693 kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1695 return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn);
1697 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1699 kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
1701 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1703 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn);
1705 int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1706 struct page **pages, int nr_pages)
1711 addr = gfn_to_hva_many(slot, gfn, &entry);
1712 if (kvm_is_error_hva(addr))
1715 if (entry < nr_pages)
1718 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1720 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1722 static struct page *kvm_pfn_to_page(kvm_pfn_t pfn)
1724 if (is_error_noslot_pfn(pfn))
1725 return KVM_ERR_PTR_BAD_PAGE;
1727 if (kvm_is_reserved_pfn(pfn)) {
1729 return KVM_ERR_PTR_BAD_PAGE;
1732 return pfn_to_page(pfn);
1735 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1739 pfn = gfn_to_pfn(kvm, gfn);
1741 return kvm_pfn_to_page(pfn);
1743 EXPORT_SYMBOL_GPL(gfn_to_page);
1745 static int __kvm_map_gfn(struct kvm_memory_slot *slot, gfn_t gfn,
1746 struct kvm_host_map *map)
1750 struct page *page = KVM_UNMAPPED_PAGE;
1755 pfn = gfn_to_pfn_memslot(slot, gfn);
1756 if (is_error_noslot_pfn(pfn))
1759 if (pfn_valid(pfn)) {
1760 page = pfn_to_page(pfn);
1762 #ifdef CONFIG_HAS_IOMEM
1764 hva = memremap(pfn_to_hpa(pfn), PAGE_SIZE, MEMREMAP_WB);
1779 int kvm_vcpu_map(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map)
1781 return __kvm_map_gfn(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, map);
1783 EXPORT_SYMBOL_GPL(kvm_vcpu_map);
1785 void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map,
1794 if (map->page != KVM_UNMAPPED_PAGE)
1796 #ifdef CONFIG_HAS_IOMEM
1802 kvm_vcpu_mark_page_dirty(vcpu, map->gfn);
1803 kvm_release_pfn_dirty(map->pfn);
1805 kvm_release_pfn_clean(map->pfn);
1811 EXPORT_SYMBOL_GPL(kvm_vcpu_unmap);
1813 struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn)
1817 pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn);
1819 return kvm_pfn_to_page(pfn);
1821 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page);
1823 void kvm_release_page_clean(struct page *page)
1825 WARN_ON(is_error_page(page));
1827 kvm_release_pfn_clean(page_to_pfn(page));
1829 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1831 void kvm_release_pfn_clean(kvm_pfn_t pfn)
1833 if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn))
1834 put_page(pfn_to_page(pfn));
1836 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1838 void kvm_release_page_dirty(struct page *page)
1840 WARN_ON(is_error_page(page));
1842 kvm_release_pfn_dirty(page_to_pfn(page));
1844 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1846 void kvm_release_pfn_dirty(kvm_pfn_t pfn)
1848 kvm_set_pfn_dirty(pfn);
1849 kvm_release_pfn_clean(pfn);
1851 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1853 void kvm_set_pfn_dirty(kvm_pfn_t pfn)
1855 if (!kvm_is_reserved_pfn(pfn)) {
1856 struct page *page = pfn_to_page(pfn);
1861 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1863 void kvm_set_pfn_accessed(kvm_pfn_t pfn)
1865 if (!kvm_is_reserved_pfn(pfn))
1866 mark_page_accessed(pfn_to_page(pfn));
1868 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1870 void kvm_get_pfn(kvm_pfn_t pfn)
1872 if (!kvm_is_reserved_pfn(pfn))
1873 get_page(pfn_to_page(pfn));
1875 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1877 static int next_segment(unsigned long len, int offset)
1879 if (len > PAGE_SIZE - offset)
1880 return PAGE_SIZE - offset;
1885 static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn,
1886 void *data, int offset, int len)
1891 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1892 if (kvm_is_error_hva(addr))
1894 r = __copy_from_user(data, (void __user *)addr + offset, len);
1900 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1903 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1905 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1907 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1909 int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data,
1910 int offset, int len)
1912 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1914 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1916 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page);
1918 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1920 gfn_t gfn = gpa >> PAGE_SHIFT;
1922 int offset = offset_in_page(gpa);
1925 while ((seg = next_segment(len, offset)) != 0) {
1926 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1936 EXPORT_SYMBOL_GPL(kvm_read_guest);
1938 int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len)
1940 gfn_t gfn = gpa >> PAGE_SHIFT;
1942 int offset = offset_in_page(gpa);
1945 while ((seg = next_segment(len, offset)) != 0) {
1946 ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg);
1956 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest);
1958 static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1959 void *data, int offset, unsigned long len)
1964 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1965 if (kvm_is_error_hva(addr))
1967 pagefault_disable();
1968 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1975 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1978 gfn_t gfn = gpa >> PAGE_SHIFT;
1979 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1980 int offset = offset_in_page(gpa);
1982 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1984 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic);
1986 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
1987 void *data, unsigned long len)
1989 gfn_t gfn = gpa >> PAGE_SHIFT;
1990 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1991 int offset = offset_in_page(gpa);
1993 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1995 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);
1997 static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn,
1998 const void *data, int offset, int len)
2003 addr = gfn_to_hva_memslot(memslot, gfn);
2004 if (kvm_is_error_hva(addr))
2006 r = __copy_to_user((void __user *)addr + offset, data, len);
2009 mark_page_dirty_in_slot(memslot, gfn);
2013 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn,
2014 const void *data, int offset, int len)
2016 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
2018 return __kvm_write_guest_page(slot, gfn, data, offset, len);
2020 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
2022 int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
2023 const void *data, int offset, int len)
2025 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2027 return __kvm_write_guest_page(slot, gfn, data, offset, len);
2029 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page);
2031 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
2034 gfn_t gfn = gpa >> PAGE_SHIFT;
2036 int offset = offset_in_page(gpa);
2039 while ((seg = next_segment(len, offset)) != 0) {
2040 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
2050 EXPORT_SYMBOL_GPL(kvm_write_guest);
2052 int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
2055 gfn_t gfn = gpa >> PAGE_SHIFT;
2057 int offset = offset_in_page(gpa);
2060 while ((seg = next_segment(len, offset)) != 0) {
2061 ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg);
2071 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest);
2073 static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots,
2074 struct gfn_to_hva_cache *ghc,
2075 gpa_t gpa, unsigned long len)
2077 int offset = offset_in_page(gpa);
2078 gfn_t start_gfn = gpa >> PAGE_SHIFT;
2079 gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
2080 gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
2081 gfn_t nr_pages_avail;
2082 int r = start_gfn <= end_gfn ? 0 : -EINVAL;
2085 ghc->generation = slots->generation;
2087 ghc->hva = KVM_HVA_ERR_BAD;
2090 * If the requested region crosses two memslots, we still
2091 * verify that the entire region is valid here.
2093 while (!r && start_gfn <= end_gfn) {
2094 ghc->memslot = __gfn_to_memslot(slots, start_gfn);
2095 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
2097 if (kvm_is_error_hva(ghc->hva))
2099 start_gfn += nr_pages_avail;
2102 /* Use the slow path for cross page reads and writes. */
2103 if (!r && nr_pages_needed == 1)
2106 ghc->memslot = NULL;
2111 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
2112 gpa_t gpa, unsigned long len)
2114 struct kvm_memslots *slots = kvm_memslots(kvm);
2115 return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len);
2117 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
2119 int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
2120 void *data, unsigned int offset,
2123 struct kvm_memslots *slots = kvm_memslots(kvm);
2125 gpa_t gpa = ghc->gpa + offset;
2127 BUG_ON(len + offset > ghc->len);
2129 if (slots->generation != ghc->generation)
2130 __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
2132 if (unlikely(!ghc->memslot))
2133 return kvm_write_guest(kvm, gpa, data, len);
2135 if (kvm_is_error_hva(ghc->hva))
2138 r = __copy_to_user((void __user *)ghc->hva + offset, data, len);
2141 mark_page_dirty_in_slot(ghc->memslot, gpa >> PAGE_SHIFT);
2145 EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached);
2147 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
2148 void *data, unsigned long len)
2150 return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len);
2152 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
2154 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
2155 void *data, unsigned long len)
2157 struct kvm_memslots *slots = kvm_memslots(kvm);
2160 BUG_ON(len > ghc->len);
2162 if (slots->generation != ghc->generation)
2163 __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
2165 if (unlikely(!ghc->memslot))
2166 return kvm_read_guest(kvm, ghc->gpa, data, len);
2168 if (kvm_is_error_hva(ghc->hva))
2171 r = __copy_from_user(data, (void __user *)ghc->hva, len);
2177 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
2179 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
2181 const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2183 return kvm_write_guest_page(kvm, gfn, zero_page, offset, len);
2185 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
2187 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
2189 gfn_t gfn = gpa >> PAGE_SHIFT;
2191 int offset = offset_in_page(gpa);
2194 while ((seg = next_segment(len, offset)) != 0) {
2195 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
2204 EXPORT_SYMBOL_GPL(kvm_clear_guest);
2206 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot,
2209 if (memslot && memslot->dirty_bitmap) {
2210 unsigned long rel_gfn = gfn - memslot->base_gfn;
2212 set_bit_le(rel_gfn, memslot->dirty_bitmap);
2216 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
2218 struct kvm_memory_slot *memslot;
2220 memslot = gfn_to_memslot(kvm, gfn);
2221 mark_page_dirty_in_slot(memslot, gfn);
2223 EXPORT_SYMBOL_GPL(mark_page_dirty);
2225 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn)
2227 struct kvm_memory_slot *memslot;
2229 memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2230 mark_page_dirty_in_slot(memslot, gfn);
2232 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty);
2234 void kvm_sigset_activate(struct kvm_vcpu *vcpu)
2236 if (!vcpu->sigset_active)
2240 * This does a lockless modification of ->real_blocked, which is fine
2241 * because, only current can change ->real_blocked and all readers of
2242 * ->real_blocked don't care as long ->real_blocked is always a subset
2245 sigprocmask(SIG_SETMASK, &vcpu->sigset, ¤t->real_blocked);
2248 void kvm_sigset_deactivate(struct kvm_vcpu *vcpu)
2250 if (!vcpu->sigset_active)
2253 sigprocmask(SIG_SETMASK, ¤t->real_blocked, NULL);
2254 sigemptyset(¤t->real_blocked);
2257 static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
2259 unsigned int old, val, grow, grow_start;
2261 old = val = vcpu->halt_poll_ns;
2262 grow_start = READ_ONCE(halt_poll_ns_grow_start);
2263 grow = READ_ONCE(halt_poll_ns_grow);
2268 if (val < grow_start)
2271 if (val > halt_poll_ns)
2274 vcpu->halt_poll_ns = val;
2276 trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old);
2279 static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
2281 unsigned int old, val, shrink;
2283 old = val = vcpu->halt_poll_ns;
2284 shrink = READ_ONCE(halt_poll_ns_shrink);
2290 vcpu->halt_poll_ns = val;
2291 trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old);
2294 static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
2297 int idx = srcu_read_lock(&vcpu->kvm->srcu);
2299 if (kvm_arch_vcpu_runnable(vcpu)) {
2300 kvm_make_request(KVM_REQ_UNHALT, vcpu);
2303 if (kvm_cpu_has_pending_timer(vcpu))
2305 if (signal_pending(current))
2310 srcu_read_unlock(&vcpu->kvm->srcu, idx);
2315 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
2317 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
2320 DECLARE_SWAITQUEUE(wait);
2321 bool waited = false;
2324 kvm_arch_vcpu_blocking(vcpu);
2326 start = cur = ktime_get();
2327 if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
2328 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
2330 ++vcpu->stat.halt_attempted_poll;
2333 * This sets KVM_REQ_UNHALT if an interrupt
2336 if (kvm_vcpu_check_block(vcpu) < 0) {
2337 ++vcpu->stat.halt_successful_poll;
2338 if (!vcpu_valid_wakeup(vcpu))
2339 ++vcpu->stat.halt_poll_invalid;
2343 } while (single_task_running() && ktime_before(cur, stop));
2347 prepare_to_swait_exclusive(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
2349 if (kvm_vcpu_check_block(vcpu) < 0)
2356 finish_swait(&vcpu->wq, &wait);
2359 kvm_arch_vcpu_unblocking(vcpu);
2360 block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
2362 if (!vcpu_valid_wakeup(vcpu))
2363 shrink_halt_poll_ns(vcpu);
2364 else if (halt_poll_ns) {
2365 if (block_ns <= vcpu->halt_poll_ns)
2367 /* we had a long block, shrink polling */
2368 else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns)
2369 shrink_halt_poll_ns(vcpu);
2370 /* we had a short halt and our poll time is too small */
2371 else if (vcpu->halt_poll_ns < halt_poll_ns &&
2372 block_ns < halt_poll_ns)
2373 grow_halt_poll_ns(vcpu);
2375 vcpu->halt_poll_ns = 0;
2377 trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu));
2378 kvm_arch_vcpu_block_finish(vcpu);
2380 EXPORT_SYMBOL_GPL(kvm_vcpu_block);
2382 bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
2384 struct swait_queue_head *wqp;
2386 wqp = kvm_arch_vcpu_wq(vcpu);
2387 if (swq_has_sleeper(wqp)) {
2389 WRITE_ONCE(vcpu->ready, true);
2390 ++vcpu->stat.halt_wakeup;
2396 EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up);
2400 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2402 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
2405 int cpu = vcpu->cpu;
2407 if (kvm_vcpu_wake_up(vcpu))
2411 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
2412 if (kvm_arch_vcpu_should_kick(vcpu))
2413 smp_send_reschedule(cpu);
2416 EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
2417 #endif /* !CONFIG_S390 */
2419 int kvm_vcpu_yield_to(struct kvm_vcpu *target)
2422 struct task_struct *task = NULL;
2426 pid = rcu_dereference(target->pid);
2428 task = get_pid_task(pid, PIDTYPE_PID);
2432 ret = yield_to(task, 1);
2433 put_task_struct(task);
2437 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
2440 * Helper that checks whether a VCPU is eligible for directed yield.
2441 * Most eligible candidate to yield is decided by following heuristics:
2443 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2444 * (preempted lock holder), indicated by @in_spin_loop.
2445 * Set at the beiginning and cleared at the end of interception/PLE handler.
2447 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2448 * chance last time (mostly it has become eligible now since we have probably
2449 * yielded to lockholder in last iteration. This is done by toggling
2450 * @dy_eligible each time a VCPU checked for eligibility.)
2452 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2453 * to preempted lock-holder could result in wrong VCPU selection and CPU
2454 * burning. Giving priority for a potential lock-holder increases lock
2457 * Since algorithm is based on heuristics, accessing another VCPU data without
2458 * locking does not harm. It may result in trying to yield to same VCPU, fail
2459 * and continue with next VCPU and so on.
2461 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
2463 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2466 eligible = !vcpu->spin_loop.in_spin_loop ||
2467 vcpu->spin_loop.dy_eligible;
2469 if (vcpu->spin_loop.in_spin_loop)
2470 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
2479 * Unlike kvm_arch_vcpu_runnable, this function is called outside
2480 * a vcpu_load/vcpu_put pair. However, for most architectures
2481 * kvm_arch_vcpu_runnable does not require vcpu_load.
2483 bool __weak kvm_arch_dy_runnable(struct kvm_vcpu *vcpu)
2485 return kvm_arch_vcpu_runnable(vcpu);
2488 static bool vcpu_dy_runnable(struct kvm_vcpu *vcpu)
2490 if (kvm_arch_dy_runnable(vcpu))
2493 #ifdef CONFIG_KVM_ASYNC_PF
2494 if (!list_empty_careful(&vcpu->async_pf.done))
2501 void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode)
2503 struct kvm *kvm = me->kvm;
2504 struct kvm_vcpu *vcpu;
2505 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
2511 kvm_vcpu_set_in_spin_loop(me, true);
2513 * We boost the priority of a VCPU that is runnable but not
2514 * currently running, because it got preempted by something
2515 * else and called schedule in __vcpu_run. Hopefully that
2516 * VCPU is holding the lock that we need and will release it.
2517 * We approximate round-robin by starting at the last boosted VCPU.
2519 for (pass = 0; pass < 2 && !yielded && try; pass++) {
2520 kvm_for_each_vcpu(i, vcpu, kvm) {
2521 if (!pass && i <= last_boosted_vcpu) {
2522 i = last_boosted_vcpu;
2524 } else if (pass && i > last_boosted_vcpu)
2526 if (!READ_ONCE(vcpu->ready))
2530 if (swait_active(&vcpu->wq) && !vcpu_dy_runnable(vcpu))
2532 if (READ_ONCE(vcpu->preempted) && yield_to_kernel_mode &&
2533 !kvm_arch_vcpu_in_kernel(vcpu))
2535 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
2538 yielded = kvm_vcpu_yield_to(vcpu);
2540 kvm->last_boosted_vcpu = i;
2542 } else if (yielded < 0) {
2549 kvm_vcpu_set_in_spin_loop(me, false);
2551 /* Ensure vcpu is not eligible during next spinloop */
2552 kvm_vcpu_set_dy_eligible(me, false);
2554 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
2556 static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf)
2558 struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data;
2561 if (vmf->pgoff == 0)
2562 page = virt_to_page(vcpu->run);
2564 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
2565 page = virt_to_page(vcpu->arch.pio_data);
2567 #ifdef CONFIG_KVM_MMIO
2568 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
2569 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
2572 return kvm_arch_vcpu_fault(vcpu, vmf);
2578 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
2579 .fault = kvm_vcpu_fault,
2582 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2584 vma->vm_ops = &kvm_vcpu_vm_ops;
2588 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2590 struct kvm_vcpu *vcpu = filp->private_data;
2592 debugfs_remove_recursive(vcpu->debugfs_dentry);
2593 kvm_put_kvm(vcpu->kvm);
2597 static struct file_operations kvm_vcpu_fops = {
2598 .release = kvm_vcpu_release,
2599 .unlocked_ioctl = kvm_vcpu_ioctl,
2600 .mmap = kvm_vcpu_mmap,
2601 .llseek = noop_llseek,
2602 KVM_COMPAT(kvm_vcpu_compat_ioctl),
2606 * Allocates an inode for the vcpu.
2608 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2610 char name[8 + 1 + ITOA_MAX_LEN + 1];
2612 snprintf(name, sizeof(name), "kvm-vcpu:%d", vcpu->vcpu_id);
2613 return anon_inode_getfd(name, &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
2616 static void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
2618 #ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS
2619 char dir_name[ITOA_MAX_LEN * 2];
2621 if (!debugfs_initialized())
2624 snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id);
2625 vcpu->debugfs_dentry = debugfs_create_dir(dir_name,
2626 vcpu->kvm->debugfs_dentry);
2628 kvm_arch_create_vcpu_debugfs(vcpu);
2633 * Creates some virtual cpus. Good luck creating more than one.
2635 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
2638 struct kvm_vcpu *vcpu;
2640 if (id >= KVM_MAX_VCPU_ID)
2643 mutex_lock(&kvm->lock);
2644 if (kvm->created_vcpus == KVM_MAX_VCPUS) {
2645 mutex_unlock(&kvm->lock);
2649 kvm->created_vcpus++;
2650 mutex_unlock(&kvm->lock);
2652 vcpu = kvm_arch_vcpu_create(kvm, id);
2655 goto vcpu_decrement;
2658 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2660 r = kvm_arch_vcpu_setup(vcpu);
2664 kvm_create_vcpu_debugfs(vcpu);
2666 mutex_lock(&kvm->lock);
2667 if (kvm_get_vcpu_by_id(kvm, id)) {
2669 goto unlock_vcpu_destroy;
2672 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
2674 /* Now it's all set up, let userspace reach it */
2676 r = create_vcpu_fd(vcpu);
2679 goto unlock_vcpu_destroy;
2682 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
2685 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2686 * before kvm->online_vcpu's incremented value.
2689 atomic_inc(&kvm->online_vcpus);
2691 mutex_unlock(&kvm->lock);
2692 kvm_arch_vcpu_postcreate(vcpu);
2695 unlock_vcpu_destroy:
2696 mutex_unlock(&kvm->lock);
2697 debugfs_remove_recursive(vcpu->debugfs_dentry);
2699 kvm_arch_vcpu_destroy(vcpu);
2701 mutex_lock(&kvm->lock);
2702 kvm->created_vcpus--;
2703 mutex_unlock(&kvm->lock);
2707 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2710 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2711 vcpu->sigset_active = 1;
2712 vcpu->sigset = *sigset;
2714 vcpu->sigset_active = 0;
2718 static long kvm_vcpu_ioctl(struct file *filp,
2719 unsigned int ioctl, unsigned long arg)
2721 struct kvm_vcpu *vcpu = filp->private_data;
2722 void __user *argp = (void __user *)arg;
2724 struct kvm_fpu *fpu = NULL;
2725 struct kvm_sregs *kvm_sregs = NULL;
2727 if (vcpu->kvm->mm != current->mm)
2730 if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
2734 * Some architectures have vcpu ioctls that are asynchronous to vcpu
2735 * execution; mutex_lock() would break them.
2737 r = kvm_arch_vcpu_async_ioctl(filp, ioctl, arg);
2738 if (r != -ENOIOCTLCMD)
2741 if (mutex_lock_killable(&vcpu->mutex))
2749 oldpid = rcu_access_pointer(vcpu->pid);
2750 if (unlikely(oldpid != task_pid(current))) {
2751 /* The thread running this VCPU changed. */
2754 r = kvm_arch_vcpu_run_pid_change(vcpu);
2758 newpid = get_task_pid(current, PIDTYPE_PID);
2759 rcu_assign_pointer(vcpu->pid, newpid);
2764 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
2765 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
2768 case KVM_GET_REGS: {
2769 struct kvm_regs *kvm_regs;
2772 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL_ACCOUNT);
2775 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
2779 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
2786 case KVM_SET_REGS: {
2787 struct kvm_regs *kvm_regs;
2790 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
2791 if (IS_ERR(kvm_regs)) {
2792 r = PTR_ERR(kvm_regs);
2795 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2799 case KVM_GET_SREGS: {
2800 kvm_sregs = kzalloc(sizeof(struct kvm_sregs),
2801 GFP_KERNEL_ACCOUNT);
2805 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2809 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2814 case KVM_SET_SREGS: {
2815 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2816 if (IS_ERR(kvm_sregs)) {
2817 r = PTR_ERR(kvm_sregs);
2821 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2824 case KVM_GET_MP_STATE: {
2825 struct kvm_mp_state mp_state;
2827 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2831 if (copy_to_user(argp, &mp_state, sizeof(mp_state)))
2836 case KVM_SET_MP_STATE: {
2837 struct kvm_mp_state mp_state;
2840 if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
2842 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2845 case KVM_TRANSLATE: {
2846 struct kvm_translation tr;
2849 if (copy_from_user(&tr, argp, sizeof(tr)))
2851 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2855 if (copy_to_user(argp, &tr, sizeof(tr)))
2860 case KVM_SET_GUEST_DEBUG: {
2861 struct kvm_guest_debug dbg;
2864 if (copy_from_user(&dbg, argp, sizeof(dbg)))
2866 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2869 case KVM_SET_SIGNAL_MASK: {
2870 struct kvm_signal_mask __user *sigmask_arg = argp;
2871 struct kvm_signal_mask kvm_sigmask;
2872 sigset_t sigset, *p;
2877 if (copy_from_user(&kvm_sigmask, argp,
2878 sizeof(kvm_sigmask)))
2881 if (kvm_sigmask.len != sizeof(sigset))
2884 if (copy_from_user(&sigset, sigmask_arg->sigset,
2889 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2893 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL_ACCOUNT);
2897 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2901 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2907 fpu = memdup_user(argp, sizeof(*fpu));
2913 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2917 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2920 mutex_unlock(&vcpu->mutex);
2926 #ifdef CONFIG_KVM_COMPAT
2927 static long kvm_vcpu_compat_ioctl(struct file *filp,
2928 unsigned int ioctl, unsigned long arg)
2930 struct kvm_vcpu *vcpu = filp->private_data;
2931 void __user *argp = compat_ptr(arg);
2934 if (vcpu->kvm->mm != current->mm)
2938 case KVM_SET_SIGNAL_MASK: {
2939 struct kvm_signal_mask __user *sigmask_arg = argp;
2940 struct kvm_signal_mask kvm_sigmask;
2945 if (copy_from_user(&kvm_sigmask, argp,
2946 sizeof(kvm_sigmask)))
2949 if (kvm_sigmask.len != sizeof(compat_sigset_t))
2952 if (get_compat_sigset(&sigset, (void *)sigmask_arg->sigset))
2954 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2956 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
2960 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2968 static int kvm_device_mmap(struct file *filp, struct vm_area_struct *vma)
2970 struct kvm_device *dev = filp->private_data;
2973 return dev->ops->mmap(dev, vma);
2978 static int kvm_device_ioctl_attr(struct kvm_device *dev,
2979 int (*accessor)(struct kvm_device *dev,
2980 struct kvm_device_attr *attr),
2983 struct kvm_device_attr attr;
2988 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2991 return accessor(dev, &attr);
2994 static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
2997 struct kvm_device *dev = filp->private_data;
2999 if (dev->kvm->mm != current->mm)
3003 case KVM_SET_DEVICE_ATTR:
3004 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
3005 case KVM_GET_DEVICE_ATTR:
3006 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
3007 case KVM_HAS_DEVICE_ATTR:
3008 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
3010 if (dev->ops->ioctl)
3011 return dev->ops->ioctl(dev, ioctl, arg);
3017 static int kvm_device_release(struct inode *inode, struct file *filp)
3019 struct kvm_device *dev = filp->private_data;
3020 struct kvm *kvm = dev->kvm;
3022 if (dev->ops->release) {
3023 mutex_lock(&kvm->lock);
3024 list_del(&dev->vm_node);
3025 dev->ops->release(dev);
3026 mutex_unlock(&kvm->lock);
3033 static const struct file_operations kvm_device_fops = {
3034 .unlocked_ioctl = kvm_device_ioctl,
3035 .release = kvm_device_release,
3036 KVM_COMPAT(kvm_device_ioctl),
3037 .mmap = kvm_device_mmap,
3040 struct kvm_device *kvm_device_from_filp(struct file *filp)
3042 if (filp->f_op != &kvm_device_fops)
3045 return filp->private_data;
3048 static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
3049 #ifdef CONFIG_KVM_MPIC
3050 [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops,
3051 [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops,
3055 int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
3057 if (type >= ARRAY_SIZE(kvm_device_ops_table))
3060 if (kvm_device_ops_table[type] != NULL)
3063 kvm_device_ops_table[type] = ops;
3067 void kvm_unregister_device_ops(u32 type)
3069 if (kvm_device_ops_table[type] != NULL)
3070 kvm_device_ops_table[type] = NULL;
3073 static int kvm_ioctl_create_device(struct kvm *kvm,
3074 struct kvm_create_device *cd)
3076 struct kvm_device_ops *ops = NULL;
3077 struct kvm_device *dev;
3078 bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
3082 if (cd->type >= ARRAY_SIZE(kvm_device_ops_table))
3085 type = array_index_nospec(cd->type, ARRAY_SIZE(kvm_device_ops_table));
3086 ops = kvm_device_ops_table[type];
3093 dev = kzalloc(sizeof(*dev), GFP_KERNEL_ACCOUNT);
3100 mutex_lock(&kvm->lock);
3101 ret = ops->create(dev, type);
3103 mutex_unlock(&kvm->lock);
3107 list_add(&dev->vm_node, &kvm->devices);
3108 mutex_unlock(&kvm->lock);
3114 ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC);
3117 mutex_lock(&kvm->lock);
3118 list_del(&dev->vm_node);
3119 mutex_unlock(&kvm->lock);
3128 static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
3131 case KVM_CAP_USER_MEMORY:
3132 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
3133 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
3134 case KVM_CAP_INTERNAL_ERROR_DATA:
3135 #ifdef CONFIG_HAVE_KVM_MSI
3136 case KVM_CAP_SIGNAL_MSI:
3138 #ifdef CONFIG_HAVE_KVM_IRQFD
3140 case KVM_CAP_IRQFD_RESAMPLE:
3142 case KVM_CAP_IOEVENTFD_ANY_LENGTH:
3143 case KVM_CAP_CHECK_EXTENSION_VM:
3144 case KVM_CAP_ENABLE_CAP_VM:
3145 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3146 case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2:
3149 #ifdef CONFIG_KVM_MMIO
3150 case KVM_CAP_COALESCED_MMIO:
3151 return KVM_COALESCED_MMIO_PAGE_OFFSET;
3152 case KVM_CAP_COALESCED_PIO:
3155 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3156 case KVM_CAP_IRQ_ROUTING:
3157 return KVM_MAX_IRQ_ROUTES;
3159 #if KVM_ADDRESS_SPACE_NUM > 1
3160 case KVM_CAP_MULTI_ADDRESS_SPACE:
3161 return KVM_ADDRESS_SPACE_NUM;
3163 case KVM_CAP_NR_MEMSLOTS:
3164 return KVM_USER_MEM_SLOTS;
3168 return kvm_vm_ioctl_check_extension(kvm, arg);
3171 int __attribute__((weak)) kvm_vm_ioctl_enable_cap(struct kvm *kvm,
3172 struct kvm_enable_cap *cap)
3177 static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
3178 struct kvm_enable_cap *cap)
3181 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3182 case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2:
3183 if (cap->flags || (cap->args[0] & ~1))
3185 kvm->manual_dirty_log_protect = cap->args[0];
3189 return kvm_vm_ioctl_enable_cap(kvm, cap);
3193 static long kvm_vm_ioctl(struct file *filp,
3194 unsigned int ioctl, unsigned long arg)
3196 struct kvm *kvm = filp->private_data;
3197 void __user *argp = (void __user *)arg;
3200 if (kvm->mm != current->mm)
3203 case KVM_CREATE_VCPU:
3204 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
3206 case KVM_ENABLE_CAP: {
3207 struct kvm_enable_cap cap;
3210 if (copy_from_user(&cap, argp, sizeof(cap)))
3212 r = kvm_vm_ioctl_enable_cap_generic(kvm, &cap);
3215 case KVM_SET_USER_MEMORY_REGION: {
3216 struct kvm_userspace_memory_region kvm_userspace_mem;
3219 if (copy_from_user(&kvm_userspace_mem, argp,
3220 sizeof(kvm_userspace_mem)))
3223 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
3226 case KVM_GET_DIRTY_LOG: {
3227 struct kvm_dirty_log log;
3230 if (copy_from_user(&log, argp, sizeof(log)))
3232 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3235 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3236 case KVM_CLEAR_DIRTY_LOG: {
3237 struct kvm_clear_dirty_log log;
3240 if (copy_from_user(&log, argp, sizeof(log)))
3242 r = kvm_vm_ioctl_clear_dirty_log(kvm, &log);
3246 #ifdef CONFIG_KVM_MMIO
3247 case KVM_REGISTER_COALESCED_MMIO: {
3248 struct kvm_coalesced_mmio_zone zone;
3251 if (copy_from_user(&zone, argp, sizeof(zone)))
3253 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
3256 case KVM_UNREGISTER_COALESCED_MMIO: {
3257 struct kvm_coalesced_mmio_zone zone;
3260 if (copy_from_user(&zone, argp, sizeof(zone)))
3262 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
3267 struct kvm_irqfd data;
3270 if (copy_from_user(&data, argp, sizeof(data)))
3272 r = kvm_irqfd(kvm, &data);
3275 case KVM_IOEVENTFD: {
3276 struct kvm_ioeventfd data;
3279 if (copy_from_user(&data, argp, sizeof(data)))
3281 r = kvm_ioeventfd(kvm, &data);
3284 #ifdef CONFIG_HAVE_KVM_MSI
3285 case KVM_SIGNAL_MSI: {
3289 if (copy_from_user(&msi, argp, sizeof(msi)))
3291 r = kvm_send_userspace_msi(kvm, &msi);
3295 #ifdef __KVM_HAVE_IRQ_LINE
3296 case KVM_IRQ_LINE_STATUS:
3297 case KVM_IRQ_LINE: {
3298 struct kvm_irq_level irq_event;
3301 if (copy_from_user(&irq_event, argp, sizeof(irq_event)))
3304 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
3305 ioctl == KVM_IRQ_LINE_STATUS);
3310 if (ioctl == KVM_IRQ_LINE_STATUS) {
3311 if (copy_to_user(argp, &irq_event, sizeof(irq_event)))
3319 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3320 case KVM_SET_GSI_ROUTING: {
3321 struct kvm_irq_routing routing;
3322 struct kvm_irq_routing __user *urouting;
3323 struct kvm_irq_routing_entry *entries = NULL;
3326 if (copy_from_user(&routing, argp, sizeof(routing)))
3329 if (!kvm_arch_can_set_irq_routing(kvm))
3331 if (routing.nr > KVM_MAX_IRQ_ROUTES)
3337 entries = vmalloc(array_size(sizeof(*entries),
3343 if (copy_from_user(entries, urouting->entries,
3344 routing.nr * sizeof(*entries)))
3345 goto out_free_irq_routing;
3347 r = kvm_set_irq_routing(kvm, entries, routing.nr,
3349 out_free_irq_routing:
3353 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
3354 case KVM_CREATE_DEVICE: {
3355 struct kvm_create_device cd;
3358 if (copy_from_user(&cd, argp, sizeof(cd)))
3361 r = kvm_ioctl_create_device(kvm, &cd);
3366 if (copy_to_user(argp, &cd, sizeof(cd)))
3372 case KVM_CHECK_EXTENSION:
3373 r = kvm_vm_ioctl_check_extension_generic(kvm, arg);
3376 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
3382 #ifdef CONFIG_KVM_COMPAT
3383 struct compat_kvm_dirty_log {
3387 compat_uptr_t dirty_bitmap; /* one bit per page */
3392 static long kvm_vm_compat_ioctl(struct file *filp,
3393 unsigned int ioctl, unsigned long arg)
3395 struct kvm *kvm = filp->private_data;
3398 if (kvm->mm != current->mm)
3401 case KVM_GET_DIRTY_LOG: {
3402 struct compat_kvm_dirty_log compat_log;
3403 struct kvm_dirty_log log;
3405 if (copy_from_user(&compat_log, (void __user *)arg,
3406 sizeof(compat_log)))
3408 log.slot = compat_log.slot;
3409 log.padding1 = compat_log.padding1;
3410 log.padding2 = compat_log.padding2;
3411 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
3413 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3417 r = kvm_vm_ioctl(filp, ioctl, arg);
3423 static struct file_operations kvm_vm_fops = {
3424 .release = kvm_vm_release,
3425 .unlocked_ioctl = kvm_vm_ioctl,
3426 .llseek = noop_llseek,
3427 KVM_COMPAT(kvm_vm_compat_ioctl),
3430 static int kvm_dev_ioctl_create_vm(unsigned long type)
3436 kvm = kvm_create_vm(type);
3438 return PTR_ERR(kvm);
3439 #ifdef CONFIG_KVM_MMIO
3440 r = kvm_coalesced_mmio_init(kvm);
3444 r = get_unused_fd_flags(O_CLOEXEC);
3448 file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
3456 * Don't call kvm_put_kvm anymore at this point; file->f_op is
3457 * already set, with ->release() being kvm_vm_release(). In error
3458 * cases it will be called by the final fput(file) and will take
3459 * care of doing kvm_put_kvm(kvm).
3461 if (kvm_create_vm_debugfs(kvm, r) < 0) {
3466 kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm);
3468 fd_install(r, file);
3476 static long kvm_dev_ioctl(struct file *filp,
3477 unsigned int ioctl, unsigned long arg)
3482 case KVM_GET_API_VERSION:
3485 r = KVM_API_VERSION;
3488 r = kvm_dev_ioctl_create_vm(arg);
3490 case KVM_CHECK_EXTENSION:
3491 r = kvm_vm_ioctl_check_extension_generic(NULL, arg);
3493 case KVM_GET_VCPU_MMAP_SIZE:
3496 r = PAGE_SIZE; /* struct kvm_run */
3498 r += PAGE_SIZE; /* pio data page */
3500 #ifdef CONFIG_KVM_MMIO
3501 r += PAGE_SIZE; /* coalesced mmio ring page */
3504 case KVM_TRACE_ENABLE:
3505 case KVM_TRACE_PAUSE:
3506 case KVM_TRACE_DISABLE:
3510 return kvm_arch_dev_ioctl(filp, ioctl, arg);
3516 static struct file_operations kvm_chardev_ops = {
3517 .unlocked_ioctl = kvm_dev_ioctl,
3518 .llseek = noop_llseek,
3519 KVM_COMPAT(kvm_dev_ioctl),
3522 static struct miscdevice kvm_dev = {
3528 static void hardware_enable_nolock(void *junk)
3530 int cpu = raw_smp_processor_id();
3533 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
3536 cpumask_set_cpu(cpu, cpus_hardware_enabled);
3538 r = kvm_arch_hardware_enable();
3541 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3542 atomic_inc(&hardware_enable_failed);
3543 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu);
3547 static int kvm_starting_cpu(unsigned int cpu)
3549 raw_spin_lock(&kvm_count_lock);
3550 if (kvm_usage_count)
3551 hardware_enable_nolock(NULL);
3552 raw_spin_unlock(&kvm_count_lock);
3556 static void hardware_disable_nolock(void *junk)
3558 int cpu = raw_smp_processor_id();
3560 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
3562 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3563 kvm_arch_hardware_disable();
3566 static int kvm_dying_cpu(unsigned int cpu)
3568 raw_spin_lock(&kvm_count_lock);
3569 if (kvm_usage_count)
3570 hardware_disable_nolock(NULL);
3571 raw_spin_unlock(&kvm_count_lock);
3575 static void hardware_disable_all_nolock(void)
3577 BUG_ON(!kvm_usage_count);
3580 if (!kvm_usage_count)
3581 on_each_cpu(hardware_disable_nolock, NULL, 1);
3584 static void hardware_disable_all(void)
3586 raw_spin_lock(&kvm_count_lock);
3587 hardware_disable_all_nolock();
3588 raw_spin_unlock(&kvm_count_lock);
3591 static int hardware_enable_all(void)
3595 raw_spin_lock(&kvm_count_lock);
3598 if (kvm_usage_count == 1) {
3599 atomic_set(&hardware_enable_failed, 0);
3600 on_each_cpu(hardware_enable_nolock, NULL, 1);
3602 if (atomic_read(&hardware_enable_failed)) {
3603 hardware_disable_all_nolock();
3608 raw_spin_unlock(&kvm_count_lock);
3613 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3617 * Some (well, at least mine) BIOSes hang on reboot if
3620 * And Intel TXT required VMX off for all cpu when system shutdown.
3622 pr_info("kvm: exiting hardware virtualization\n");
3623 kvm_rebooting = true;
3624 on_each_cpu(hardware_disable_nolock, NULL, 1);
3628 static struct notifier_block kvm_reboot_notifier = {
3629 .notifier_call = kvm_reboot,
3633 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3637 for (i = 0; i < bus->dev_count; i++) {
3638 struct kvm_io_device *pos = bus->range[i].dev;
3640 kvm_iodevice_destructor(pos);
3645 static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
3646 const struct kvm_io_range *r2)
3648 gpa_t addr1 = r1->addr;
3649 gpa_t addr2 = r2->addr;
3654 /* If r2->len == 0, match the exact address. If r2->len != 0,
3655 * accept any overlapping write. Any order is acceptable for
3656 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3657 * we process all of them.
3670 static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
3672 return kvm_io_bus_cmp(p1, p2);
3675 static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
3676 gpa_t addr, int len)
3678 struct kvm_io_range *range, key;
3681 key = (struct kvm_io_range) {
3686 range = bsearch(&key, bus->range, bus->dev_count,
3687 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
3691 off = range - bus->range;
3693 while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0)
3699 static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3700 struct kvm_io_range *range, const void *val)
3704 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3708 while (idx < bus->dev_count &&
3709 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3710 if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr,
3719 /* kvm_io_bus_write - called under kvm->slots_lock */
3720 int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3721 int len, const void *val)
3723 struct kvm_io_bus *bus;
3724 struct kvm_io_range range;
3727 range = (struct kvm_io_range) {
3732 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3735 r = __kvm_io_bus_write(vcpu, bus, &range, val);
3736 return r < 0 ? r : 0;
3738 EXPORT_SYMBOL_GPL(kvm_io_bus_write);
3740 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3741 int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
3742 gpa_t addr, int len, const void *val, long cookie)
3744 struct kvm_io_bus *bus;
3745 struct kvm_io_range range;
3747 range = (struct kvm_io_range) {
3752 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3756 /* First try the device referenced by cookie. */
3757 if ((cookie >= 0) && (cookie < bus->dev_count) &&
3758 (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
3759 if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len,
3764 * cookie contained garbage; fall back to search and return the
3765 * correct cookie value.
3767 return __kvm_io_bus_write(vcpu, bus, &range, val);
3770 static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3771 struct kvm_io_range *range, void *val)
3775 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3779 while (idx < bus->dev_count &&
3780 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3781 if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr,
3790 /* kvm_io_bus_read - called under kvm->slots_lock */
3791 int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3794 struct kvm_io_bus *bus;
3795 struct kvm_io_range range;
3798 range = (struct kvm_io_range) {
3803 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3806 r = __kvm_io_bus_read(vcpu, bus, &range, val);
3807 return r < 0 ? r : 0;
3810 /* Caller must hold slots_lock. */
3811 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
3812 int len, struct kvm_io_device *dev)
3815 struct kvm_io_bus *new_bus, *bus;
3816 struct kvm_io_range range;
3818 bus = kvm_get_bus(kvm, bus_idx);
3822 /* exclude ioeventfd which is limited by maximum fd */
3823 if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
3826 new_bus = kmalloc(struct_size(bus, range, bus->dev_count + 1),
3827 GFP_KERNEL_ACCOUNT);
3831 range = (struct kvm_io_range) {
3837 for (i = 0; i < bus->dev_count; i++)
3838 if (kvm_io_bus_cmp(&bus->range[i], &range) > 0)
3841 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3842 new_bus->dev_count++;
3843 new_bus->range[i] = range;
3844 memcpy(new_bus->range + i + 1, bus->range + i,
3845 (bus->dev_count - i) * sizeof(struct kvm_io_range));
3846 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3847 synchronize_srcu_expedited(&kvm->srcu);
3853 /* Caller must hold slots_lock. */
3854 void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3855 struct kvm_io_device *dev)
3858 struct kvm_io_bus *new_bus, *bus;
3860 bus = kvm_get_bus(kvm, bus_idx);
3864 for (i = 0; i < bus->dev_count; i++)
3865 if (bus->range[i].dev == dev) {
3869 if (i == bus->dev_count)
3872 new_bus = kmalloc(struct_size(bus, range, bus->dev_count - 1),
3873 GFP_KERNEL_ACCOUNT);
3875 pr_err("kvm: failed to shrink bus, removing it completely\n");
3879 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3880 new_bus->dev_count--;
3881 memcpy(new_bus->range + i, bus->range + i + 1,
3882 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
3885 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3886 synchronize_srcu_expedited(&kvm->srcu);
3891 struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3894 struct kvm_io_bus *bus;
3895 int dev_idx, srcu_idx;
3896 struct kvm_io_device *iodev = NULL;
3898 srcu_idx = srcu_read_lock(&kvm->srcu);
3900 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
3904 dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1);
3908 iodev = bus->range[dev_idx].dev;
3911 srcu_read_unlock(&kvm->srcu, srcu_idx);
3915 EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev);
3917 static int kvm_debugfs_open(struct inode *inode, struct file *file,
3918 int (*get)(void *, u64 *), int (*set)(void *, u64),
3921 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3924 /* The debugfs files are a reference to the kvm struct which
3925 * is still valid when kvm_destroy_vm is called.
3926 * To avoid the race between open and the removal of the debugfs
3927 * directory we test against the users count.
3929 if (!refcount_inc_not_zero(&stat_data->kvm->users_count))
3932 if (simple_attr_open(inode, file, get, set, fmt)) {
3933 kvm_put_kvm(stat_data->kvm);
3940 static int kvm_debugfs_release(struct inode *inode, struct file *file)
3942 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3945 simple_attr_release(inode, file);
3946 kvm_put_kvm(stat_data->kvm);
3951 static int vm_stat_get_per_vm(void *data, u64 *val)
3953 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3955 *val = *(ulong *)((void *)stat_data->kvm + stat_data->offset);
3960 static int vm_stat_clear_per_vm(void *data, u64 val)
3962 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3967 *(ulong *)((void *)stat_data->kvm + stat_data->offset) = 0;
3972 static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file)
3974 __simple_attr_check_format("%llu\n", 0ull);
3975 return kvm_debugfs_open(inode, file, vm_stat_get_per_vm,
3976 vm_stat_clear_per_vm, "%llu\n");
3979 static const struct file_operations vm_stat_get_per_vm_fops = {
3980 .owner = THIS_MODULE,
3981 .open = vm_stat_get_per_vm_open,
3982 .release = kvm_debugfs_release,
3983 .read = simple_attr_read,
3984 .write = simple_attr_write,
3985 .llseek = no_llseek,
3988 static int vcpu_stat_get_per_vm(void *data, u64 *val)
3991 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3992 struct kvm_vcpu *vcpu;
3996 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
3997 *val += *(u64 *)((void *)vcpu + stat_data->offset);
4002 static int vcpu_stat_clear_per_vm(void *data, u64 val)
4005 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
4006 struct kvm_vcpu *vcpu;
4011 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
4012 *(u64 *)((void *)vcpu + stat_data->offset) = 0;
4017 static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file)
4019 __simple_attr_check_format("%llu\n", 0ull);
4020 return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm,
4021 vcpu_stat_clear_per_vm, "%llu\n");
4024 static const struct file_operations vcpu_stat_get_per_vm_fops = {
4025 .owner = THIS_MODULE,
4026 .open = vcpu_stat_get_per_vm_open,
4027 .release = kvm_debugfs_release,
4028 .read = simple_attr_read,
4029 .write = simple_attr_write,
4030 .llseek = no_llseek,
4033 static const struct file_operations *stat_fops_per_vm[] = {
4034 [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops,
4035 [KVM_STAT_VM] = &vm_stat_get_per_vm_fops,
4038 static int vm_stat_get(void *_offset, u64 *val)
4040 unsigned offset = (long)_offset;
4042 struct kvm_stat_data stat_tmp = {.offset = offset};
4046 mutex_lock(&kvm_lock);
4047 list_for_each_entry(kvm, &vm_list, vm_list) {
4049 vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
4052 mutex_unlock(&kvm_lock);
4056 static int vm_stat_clear(void *_offset, u64 val)
4058 unsigned offset = (long)_offset;
4060 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_clear_per_vm((void *)&stat_tmp, 0);
4070 mutex_unlock(&kvm_lock);
4075 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n");
4077 static int vcpu_stat_get(void *_offset, u64 *val)
4079 unsigned offset = (long)_offset;
4081 struct kvm_stat_data stat_tmp = {.offset = offset};
4085 mutex_lock(&kvm_lock);
4086 list_for_each_entry(kvm, &vm_list, vm_list) {
4088 vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
4091 mutex_unlock(&kvm_lock);
4095 static int vcpu_stat_clear(void *_offset, u64 val)
4097 unsigned offset = (long)_offset;
4099 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_clear_per_vm((void *)&stat_tmp, 0);
4109 mutex_unlock(&kvm_lock);
4114 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear,
4117 static const struct file_operations *stat_fops[] = {
4118 [KVM_STAT_VCPU] = &vcpu_stat_fops,
4119 [KVM_STAT_VM] = &vm_stat_fops,
4122 static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
4124 struct kobj_uevent_env *env;
4125 unsigned long long created, active;
4127 if (!kvm_dev.this_device || !kvm)
4130 mutex_lock(&kvm_lock);
4131 if (type == KVM_EVENT_CREATE_VM) {
4132 kvm_createvm_count++;
4134 } else if (type == KVM_EVENT_DESTROY_VM) {
4137 created = kvm_createvm_count;
4138 active = kvm_active_vms;
4139 mutex_unlock(&kvm_lock);
4141 env = kzalloc(sizeof(*env), GFP_KERNEL_ACCOUNT);
4145 add_uevent_var(env, "CREATED=%llu", created);
4146 add_uevent_var(env, "COUNT=%llu", active);
4148 if (type == KVM_EVENT_CREATE_VM) {
4149 add_uevent_var(env, "EVENT=create");
4150 kvm->userspace_pid = task_pid_nr(current);
4151 } else if (type == KVM_EVENT_DESTROY_VM) {
4152 add_uevent_var(env, "EVENT=destroy");
4154 add_uevent_var(env, "PID=%d", kvm->userspace_pid);
4156 if (!IS_ERR_OR_NULL(kvm->debugfs_dentry)) {
4157 char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL_ACCOUNT);
4160 tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX);
4162 add_uevent_var(env, "STATS_PATH=%s", tmp);
4166 /* no need for checks, since we are adding at most only 5 keys */
4167 env->envp[env->envp_idx++] = NULL;
4168 kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp);
4172 static void kvm_init_debug(void)
4174 struct kvm_stats_debugfs_item *p;
4176 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
4178 kvm_debugfs_num_entries = 0;
4179 for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) {
4180 debugfs_create_file(p->name, 0644, kvm_debugfs_dir,
4181 (void *)(long)p->offset,
4182 stat_fops[p->kind]);
4186 static int kvm_suspend(void)
4188 if (kvm_usage_count)
4189 hardware_disable_nolock(NULL);
4193 static void kvm_resume(void)
4195 if (kvm_usage_count) {
4196 #ifdef CONFIG_LOCKDEP
4197 WARN_ON(lockdep_is_held(&kvm_count_lock));
4199 hardware_enable_nolock(NULL);
4203 static struct syscore_ops kvm_syscore_ops = {
4204 .suspend = kvm_suspend,
4205 .resume = kvm_resume,
4209 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
4211 return container_of(pn, struct kvm_vcpu, preempt_notifier);
4214 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
4216 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
4218 WRITE_ONCE(vcpu->preempted, false);
4219 WRITE_ONCE(vcpu->ready, false);
4221 kvm_arch_sched_in(vcpu, cpu);
4223 kvm_arch_vcpu_load(vcpu, cpu);
4226 static void kvm_sched_out(struct preempt_notifier *pn,
4227 struct task_struct *next)
4229 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
4231 if (current->state == TASK_RUNNING) {
4232 WRITE_ONCE(vcpu->preempted, true);
4233 WRITE_ONCE(vcpu->ready, true);
4235 kvm_arch_vcpu_put(vcpu);
4238 static void check_processor_compat(void *rtn)
4240 *(int *)rtn = kvm_arch_check_processor_compat();
4243 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
4244 struct module *module)
4249 r = kvm_arch_init(opaque);
4254 * kvm_arch_init makes sure there's at most one caller
4255 * for architectures that support multiple implementations,
4256 * like intel and amd on x86.
4257 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
4258 * conflicts in case kvm is already setup for another implementation.
4260 r = kvm_irqfd_init();
4264 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
4269 r = kvm_arch_hardware_setup();
4273 for_each_online_cpu(cpu) {
4274 smp_call_function_single(cpu, check_processor_compat, &r, 1);
4279 r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting",
4280 kvm_starting_cpu, kvm_dying_cpu);
4283 register_reboot_notifier(&kvm_reboot_notifier);
4285 /* A kmem cache lets us meet the alignment requirements of fx_save. */
4287 vcpu_align = __alignof__(struct kvm_vcpu);
4289 kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align,
4291 offsetof(struct kvm_vcpu, arch),
4292 sizeof_field(struct kvm_vcpu, arch),
4294 if (!kvm_vcpu_cache) {
4299 r = kvm_async_pf_init();
4303 kvm_chardev_ops.owner = module;
4304 kvm_vm_fops.owner = module;
4305 kvm_vcpu_fops.owner = module;
4307 r = misc_register(&kvm_dev);
4309 pr_err("kvm: misc device register failed\n");
4313 register_syscore_ops(&kvm_syscore_ops);
4315 kvm_preempt_ops.sched_in = kvm_sched_in;
4316 kvm_preempt_ops.sched_out = kvm_sched_out;
4320 r = kvm_vfio_ops_init();
4326 kvm_async_pf_deinit();
4328 kmem_cache_destroy(kvm_vcpu_cache);
4330 unregister_reboot_notifier(&kvm_reboot_notifier);
4331 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
4334 kvm_arch_hardware_unsetup();
4336 free_cpumask_var(cpus_hardware_enabled);
4344 EXPORT_SYMBOL_GPL(kvm_init);
4348 debugfs_remove_recursive(kvm_debugfs_dir);
4349 misc_deregister(&kvm_dev);
4350 kmem_cache_destroy(kvm_vcpu_cache);
4351 kvm_async_pf_deinit();
4352 unregister_syscore_ops(&kvm_syscore_ops);
4353 unregister_reboot_notifier(&kvm_reboot_notifier);
4354 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
4355 on_each_cpu(hardware_disable_nolock, NULL, 1);
4356 kvm_arch_hardware_unsetup();
4359 free_cpumask_var(cpus_hardware_enabled);
4360 kvm_vfio_ops_exit();
4362 EXPORT_SYMBOL_GPL(kvm_exit);