2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
8 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
19 #include <kvm/iodev.h>
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/percpu.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/syscore_ops.h>
34 #include <linux/cpu.h>
35 #include <linux/sched/signal.h>
36 #include <linux/sched/mm.h>
37 #include <linux/sched/stat.h>
38 #include <linux/cpumask.h>
39 #include <linux/smp.h>
40 #include <linux/anon_inodes.h>
41 #include <linux/profile.h>
42 #include <linux/kvm_para.h>
43 #include <linux/pagemap.h>
44 #include <linux/mman.h>
45 #include <linux/swap.h>
46 #include <linux/bitops.h>
47 #include <linux/spinlock.h>
48 #include <linux/compat.h>
49 #include <linux/srcu.h>
50 #include <linux/hugetlb.h>
51 #include <linux/slab.h>
52 #include <linux/sort.h>
53 #include <linux/bsearch.h>
55 #include <asm/processor.h>
57 #include <asm/ioctl.h>
58 #include <linux/uaccess.h>
59 #include <asm/pgtable.h>
61 #include "coalesced_mmio.h"
65 #define CREATE_TRACE_POINTS
66 #include <trace/events/kvm.h>
68 /* Worst case buffer size needed for holding an integer. */
69 #define ITOA_MAX_LEN 12
71 MODULE_AUTHOR("Qumranet");
72 MODULE_LICENSE("GPL");
74 /* Architectures should define their poll value according to the halt latency */
75 unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT;
76 module_param(halt_poll_ns, uint, 0644);
77 EXPORT_SYMBOL_GPL(halt_poll_ns);
79 /* Default doubles per-vcpu halt_poll_ns. */
80 unsigned int halt_poll_ns_grow = 2;
81 module_param(halt_poll_ns_grow, uint, 0644);
82 EXPORT_SYMBOL_GPL(halt_poll_ns_grow);
84 /* Default resets per-vcpu halt_poll_ns . */
85 unsigned int halt_poll_ns_shrink;
86 module_param(halt_poll_ns_shrink, uint, 0644);
87 EXPORT_SYMBOL_GPL(halt_poll_ns_shrink);
92 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
95 DEFINE_SPINLOCK(kvm_lock);
96 static DEFINE_RAW_SPINLOCK(kvm_count_lock);
99 static cpumask_var_t cpus_hardware_enabled;
100 static int kvm_usage_count;
101 static atomic_t hardware_enable_failed;
103 struct kmem_cache *kvm_vcpu_cache;
104 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
106 static __read_mostly struct preempt_ops kvm_preempt_ops;
108 struct dentry *kvm_debugfs_dir;
109 EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
111 static int kvm_debugfs_num_entries;
112 static const struct file_operations *stat_fops_per_vm[];
114 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
116 #ifdef CONFIG_KVM_COMPAT
117 static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
119 #define KVM_COMPAT(c) .compat_ioctl = (c)
121 static long kvm_no_compat_ioctl(struct file *file, unsigned int ioctl,
122 unsigned long arg) { return -EINVAL; }
123 #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl
125 static int hardware_enable_all(void);
126 static void hardware_disable_all(void);
128 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
130 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn);
132 __visible bool kvm_rebooting;
133 EXPORT_SYMBOL_GPL(kvm_rebooting);
135 static bool largepages_enabled = true;
137 #define KVM_EVENT_CREATE_VM 0
138 #define KVM_EVENT_DESTROY_VM 1
139 static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm);
140 static unsigned long long kvm_createvm_count;
141 static unsigned long long kvm_active_vms;
143 __weak int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
144 unsigned long start, unsigned long end, bool blockable)
149 bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
152 return PageReserved(pfn_to_page(pfn));
158 * Switches to specified vcpu, until a matching vcpu_put()
160 void vcpu_load(struct kvm_vcpu *vcpu)
163 preempt_notifier_register(&vcpu->preempt_notifier);
164 kvm_arch_vcpu_load(vcpu, cpu);
167 EXPORT_SYMBOL_GPL(vcpu_load);
169 void vcpu_put(struct kvm_vcpu *vcpu)
172 kvm_arch_vcpu_put(vcpu);
173 preempt_notifier_unregister(&vcpu->preempt_notifier);
176 EXPORT_SYMBOL_GPL(vcpu_put);
178 /* TODO: merge with kvm_arch_vcpu_should_kick */
179 static bool kvm_request_needs_ipi(struct kvm_vcpu *vcpu, unsigned req)
181 int mode = kvm_vcpu_exiting_guest_mode(vcpu);
184 * We need to wait for the VCPU to reenable interrupts and get out of
185 * READING_SHADOW_PAGE_TABLES mode.
187 if (req & KVM_REQUEST_WAIT)
188 return mode != OUTSIDE_GUEST_MODE;
191 * Need to kick a running VCPU, but otherwise there is nothing to do.
193 return mode == IN_GUEST_MODE;
196 static void ack_flush(void *_completed)
200 static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait)
203 cpus = cpu_online_mask;
205 if (cpumask_empty(cpus))
208 smp_call_function_many(cpus, ack_flush, NULL, wait);
212 bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
213 unsigned long *vcpu_bitmap, cpumask_var_t tmp)
216 struct kvm_vcpu *vcpu;
221 kvm_for_each_vcpu(i, vcpu, kvm) {
222 if (vcpu_bitmap && !test_bit(i, vcpu_bitmap))
225 kvm_make_request(req, vcpu);
228 if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu))
231 if (tmp != NULL && cpu != -1 && cpu != me &&
232 kvm_request_needs_ipi(vcpu, req))
233 __cpumask_set_cpu(cpu, tmp);
236 called = kvm_kick_many_cpus(tmp, !!(req & KVM_REQUEST_WAIT));
242 bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
247 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
249 called = kvm_make_vcpus_request_mask(kvm, req, NULL, cpus);
251 free_cpumask_var(cpus);
255 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
256 void kvm_flush_remote_tlbs(struct kvm *kvm)
259 * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
260 * kvm_make_all_cpus_request.
262 long dirty_count = smp_load_acquire(&kvm->tlbs_dirty);
265 * We want to publish modifications to the page tables before reading
266 * mode. Pairs with a memory barrier in arch-specific code.
267 * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest
268 * and smp_mb in walk_shadow_page_lockless_begin/end.
269 * - powerpc: smp_mb in kvmppc_prepare_to_enter.
271 * There is already an smp_mb__after_atomic() before
272 * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
275 if (!kvm_arch_flush_remote_tlb(kvm)
276 || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
277 ++kvm->stat.remote_tlb_flush;
278 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
280 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
283 void kvm_reload_remote_mmus(struct kvm *kvm)
285 kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
288 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
293 mutex_init(&vcpu->mutex);
298 init_swait_queue_head(&vcpu->wq);
299 kvm_async_pf_vcpu_init(vcpu);
302 INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
304 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
309 vcpu->run = page_address(page);
311 kvm_vcpu_set_in_spin_loop(vcpu, false);
312 kvm_vcpu_set_dy_eligible(vcpu, false);
313 vcpu->preempted = false;
315 r = kvm_arch_vcpu_init(vcpu);
321 free_page((unsigned long)vcpu->run);
325 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
327 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
330 * no need for rcu_read_lock as VCPU_RUN is the only place that
331 * will change the vcpu->pid pointer and on uninit all file
332 * descriptors are already gone.
334 put_pid(rcu_dereference_protected(vcpu->pid, 1));
335 kvm_arch_vcpu_uninit(vcpu);
336 free_page((unsigned long)vcpu->run);
338 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
340 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
341 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
343 return container_of(mn, struct kvm, mmu_notifier);
346 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
347 struct mm_struct *mm,
348 unsigned long address,
351 struct kvm *kvm = mmu_notifier_to_kvm(mn);
354 idx = srcu_read_lock(&kvm->srcu);
355 spin_lock(&kvm->mmu_lock);
356 kvm->mmu_notifier_seq++;
357 kvm_set_spte_hva(kvm, address, pte);
358 spin_unlock(&kvm->mmu_lock);
359 srcu_read_unlock(&kvm->srcu, idx);
362 static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
363 struct mm_struct *mm,
368 struct kvm *kvm = mmu_notifier_to_kvm(mn);
369 int need_tlb_flush = 0, idx;
372 idx = srcu_read_lock(&kvm->srcu);
373 spin_lock(&kvm->mmu_lock);
375 * The count increase must become visible at unlock time as no
376 * spte can be established without taking the mmu_lock and
377 * count is also read inside the mmu_lock critical section.
379 kvm->mmu_notifier_count++;
380 need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
381 need_tlb_flush |= kvm->tlbs_dirty;
382 /* we've to flush the tlb before the pages can be freed */
384 kvm_flush_remote_tlbs(kvm);
386 spin_unlock(&kvm->mmu_lock);
388 ret = kvm_arch_mmu_notifier_invalidate_range(kvm, start, end, blockable);
390 srcu_read_unlock(&kvm->srcu, idx);
395 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
396 struct mm_struct *mm,
400 struct kvm *kvm = mmu_notifier_to_kvm(mn);
402 spin_lock(&kvm->mmu_lock);
404 * This sequence increase will notify the kvm page fault that
405 * the page that is going to be mapped in the spte could have
408 kvm->mmu_notifier_seq++;
411 * The above sequence increase must be visible before the
412 * below count decrease, which is ensured by the smp_wmb above
413 * in conjunction with the smp_rmb in mmu_notifier_retry().
415 kvm->mmu_notifier_count--;
416 spin_unlock(&kvm->mmu_lock);
418 BUG_ON(kvm->mmu_notifier_count < 0);
421 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
422 struct mm_struct *mm,
426 struct kvm *kvm = mmu_notifier_to_kvm(mn);
429 idx = srcu_read_lock(&kvm->srcu);
430 spin_lock(&kvm->mmu_lock);
432 young = kvm_age_hva(kvm, start, end);
434 kvm_flush_remote_tlbs(kvm);
436 spin_unlock(&kvm->mmu_lock);
437 srcu_read_unlock(&kvm->srcu, idx);
442 static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
443 struct mm_struct *mm,
447 struct kvm *kvm = mmu_notifier_to_kvm(mn);
450 idx = srcu_read_lock(&kvm->srcu);
451 spin_lock(&kvm->mmu_lock);
453 * Even though we do not flush TLB, this will still adversely
454 * affect performance on pre-Haswell Intel EPT, where there is
455 * no EPT Access Bit to clear so that we have to tear down EPT
456 * tables instead. If we find this unacceptable, we can always
457 * add a parameter to kvm_age_hva so that it effectively doesn't
458 * do anything on clear_young.
460 * Also note that currently we never issue secondary TLB flushes
461 * from clear_young, leaving this job up to the regular system
462 * cadence. If we find this inaccurate, we might come up with a
463 * more sophisticated heuristic later.
465 young = kvm_age_hva(kvm, start, end);
466 spin_unlock(&kvm->mmu_lock);
467 srcu_read_unlock(&kvm->srcu, idx);
472 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
473 struct mm_struct *mm,
474 unsigned long address)
476 struct kvm *kvm = mmu_notifier_to_kvm(mn);
479 idx = srcu_read_lock(&kvm->srcu);
480 spin_lock(&kvm->mmu_lock);
481 young = kvm_test_age_hva(kvm, address);
482 spin_unlock(&kvm->mmu_lock);
483 srcu_read_unlock(&kvm->srcu, idx);
488 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
489 struct mm_struct *mm)
491 struct kvm *kvm = mmu_notifier_to_kvm(mn);
494 idx = srcu_read_lock(&kvm->srcu);
495 kvm_arch_flush_shadow_all(kvm);
496 srcu_read_unlock(&kvm->srcu, idx);
499 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
500 .flags = MMU_INVALIDATE_DOES_NOT_BLOCK,
501 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
502 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
503 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
504 .clear_young = kvm_mmu_notifier_clear_young,
505 .test_young = kvm_mmu_notifier_test_young,
506 .change_pte = kvm_mmu_notifier_change_pte,
507 .release = kvm_mmu_notifier_release,
510 static int kvm_init_mmu_notifier(struct kvm *kvm)
512 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
513 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
516 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
518 static int kvm_init_mmu_notifier(struct kvm *kvm)
523 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
525 static struct kvm_memslots *kvm_alloc_memslots(void)
528 struct kvm_memslots *slots;
530 slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
534 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
535 slots->id_to_index[i] = slots->memslots[i].id = i;
540 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
542 if (!memslot->dirty_bitmap)
545 kvfree(memslot->dirty_bitmap);
546 memslot->dirty_bitmap = NULL;
550 * Free any memory in @free but not in @dont.
552 static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
553 struct kvm_memory_slot *dont)
555 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
556 kvm_destroy_dirty_bitmap(free);
558 kvm_arch_free_memslot(kvm, free, dont);
563 static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
565 struct kvm_memory_slot *memslot;
570 kvm_for_each_memslot(memslot, slots)
571 kvm_free_memslot(kvm, memslot, NULL);
576 static void kvm_destroy_vm_debugfs(struct kvm *kvm)
580 if (!kvm->debugfs_dentry)
583 debugfs_remove_recursive(kvm->debugfs_dentry);
585 if (kvm->debugfs_stat_data) {
586 for (i = 0; i < kvm_debugfs_num_entries; i++)
587 kfree(kvm->debugfs_stat_data[i]);
588 kfree(kvm->debugfs_stat_data);
592 static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
594 char dir_name[ITOA_MAX_LEN * 2];
595 struct kvm_stat_data *stat_data;
596 struct kvm_stats_debugfs_item *p;
598 if (!debugfs_initialized())
601 snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd);
602 kvm->debugfs_dentry = debugfs_create_dir(dir_name, kvm_debugfs_dir);
604 kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries,
605 sizeof(*kvm->debugfs_stat_data),
607 if (!kvm->debugfs_stat_data)
610 for (p = debugfs_entries; p->name; p++) {
611 stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL);
615 stat_data->kvm = kvm;
616 stat_data->offset = p->offset;
617 kvm->debugfs_stat_data[p - debugfs_entries] = stat_data;
618 debugfs_create_file(p->name, 0644, kvm->debugfs_dentry,
619 stat_data, stat_fops_per_vm[p->kind]);
624 static struct kvm *kvm_create_vm(unsigned long type)
627 struct kvm *kvm = kvm_arch_alloc_vm();
630 return ERR_PTR(-ENOMEM);
632 spin_lock_init(&kvm->mmu_lock);
634 kvm->mm = current->mm;
635 kvm_eventfd_init(kvm);
636 mutex_init(&kvm->lock);
637 mutex_init(&kvm->irq_lock);
638 mutex_init(&kvm->slots_lock);
639 refcount_set(&kvm->users_count, 1);
640 INIT_LIST_HEAD(&kvm->devices);
642 r = kvm_arch_init_vm(kvm, type);
644 goto out_err_no_disable;
646 r = hardware_enable_all();
648 goto out_err_no_disable;
650 #ifdef CONFIG_HAVE_KVM_IRQFD
651 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
654 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
657 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
658 struct kvm_memslots *slots = kvm_alloc_memslots();
660 goto out_err_no_srcu;
662 * Generations must be different for each address space.
663 * Init kvm generation close to the maximum to easily test the
664 * code of handling generation number wrap-around.
666 slots->generation = i * 2 - 150;
667 rcu_assign_pointer(kvm->memslots[i], slots);
670 if (init_srcu_struct(&kvm->srcu))
671 goto out_err_no_srcu;
672 if (init_srcu_struct(&kvm->irq_srcu))
673 goto out_err_no_irq_srcu;
674 for (i = 0; i < KVM_NR_BUSES; i++) {
675 rcu_assign_pointer(kvm->buses[i],
676 kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL));
681 r = kvm_init_mmu_notifier(kvm);
685 spin_lock(&kvm_lock);
686 list_add(&kvm->vm_list, &vm_list);
687 spin_unlock(&kvm_lock);
689 preempt_notifier_inc();
694 cleanup_srcu_struct(&kvm->irq_srcu);
696 cleanup_srcu_struct(&kvm->srcu);
698 hardware_disable_all();
700 refcount_set(&kvm->users_count, 0);
701 for (i = 0; i < KVM_NR_BUSES; i++)
702 kfree(kvm_get_bus(kvm, i));
703 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
704 kvm_free_memslots(kvm, __kvm_memslots(kvm, i));
705 kvm_arch_free_vm(kvm);
710 static void kvm_destroy_devices(struct kvm *kvm)
712 struct kvm_device *dev, *tmp;
715 * We do not need to take the kvm->lock here, because nobody else
716 * has a reference to the struct kvm at this point and therefore
717 * cannot access the devices list anyhow.
719 list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) {
720 list_del(&dev->vm_node);
721 dev->ops->destroy(dev);
725 static void kvm_destroy_vm(struct kvm *kvm)
728 struct mm_struct *mm = kvm->mm;
730 kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm);
731 kvm_destroy_vm_debugfs(kvm);
732 kvm_arch_sync_events(kvm);
733 spin_lock(&kvm_lock);
734 list_del(&kvm->vm_list);
735 spin_unlock(&kvm_lock);
736 kvm_free_irq_routing(kvm);
737 for (i = 0; i < KVM_NR_BUSES; i++) {
738 struct kvm_io_bus *bus = kvm_get_bus(kvm, i);
741 kvm_io_bus_destroy(bus);
742 kvm->buses[i] = NULL;
744 kvm_coalesced_mmio_free(kvm);
745 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
746 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
748 kvm_arch_flush_shadow_all(kvm);
750 kvm_arch_destroy_vm(kvm);
751 kvm_destroy_devices(kvm);
752 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
753 kvm_free_memslots(kvm, __kvm_memslots(kvm, i));
754 cleanup_srcu_struct(&kvm->irq_srcu);
755 cleanup_srcu_struct(&kvm->srcu);
756 kvm_arch_free_vm(kvm);
757 preempt_notifier_dec();
758 hardware_disable_all();
762 void kvm_get_kvm(struct kvm *kvm)
764 refcount_inc(&kvm->users_count);
766 EXPORT_SYMBOL_GPL(kvm_get_kvm);
768 void kvm_put_kvm(struct kvm *kvm)
770 if (refcount_dec_and_test(&kvm->users_count))
773 EXPORT_SYMBOL_GPL(kvm_put_kvm);
776 static int kvm_vm_release(struct inode *inode, struct file *filp)
778 struct kvm *kvm = filp->private_data;
780 kvm_irqfd_release(kvm);
787 * Allocation size is twice as large as the actual dirty bitmap size.
788 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
790 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
792 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
794 memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL);
795 if (!memslot->dirty_bitmap)
802 * Insert memslot and re-sort memslots based on their GFN,
803 * so binary search could be used to lookup GFN.
804 * Sorting algorithm takes advantage of having initially
805 * sorted array and known changed memslot position.
807 static void update_memslots(struct kvm_memslots *slots,
808 struct kvm_memory_slot *new,
809 enum kvm_mr_change change)
812 int i = slots->id_to_index[id];
813 struct kvm_memory_slot *mslots = slots->memslots;
815 WARN_ON(mslots[i].id != id);
819 WARN_ON(mslots[i].npages || !new->npages);
823 WARN_ON(new->npages || !mslots[i].npages);
829 while (i < KVM_MEM_SLOTS_NUM - 1 &&
830 new->base_gfn <= mslots[i + 1].base_gfn) {
831 if (!mslots[i + 1].npages)
833 mslots[i] = mslots[i + 1];
834 slots->id_to_index[mslots[i].id] = i;
839 * The ">=" is needed when creating a slot with base_gfn == 0,
840 * so that it moves before all those with base_gfn == npages == 0.
842 * On the other hand, if new->npages is zero, the above loop has
843 * already left i pointing to the beginning of the empty part of
844 * mslots, and the ">=" would move the hole backwards in this
845 * case---which is wrong. So skip the loop when deleting a slot.
849 new->base_gfn >= mslots[i - 1].base_gfn) {
850 mslots[i] = mslots[i - 1];
851 slots->id_to_index[mslots[i].id] = i;
855 WARN_ON_ONCE(i != slots->used_slots);
858 slots->id_to_index[mslots[i].id] = i;
861 static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem)
863 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
865 #ifdef __KVM_HAVE_READONLY_MEM
866 valid_flags |= KVM_MEM_READONLY;
869 if (mem->flags & ~valid_flags)
875 static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
876 int as_id, struct kvm_memslots *slots)
878 struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id);
881 * Set the low bit in the generation, which disables SPTE caching
882 * until the end of synchronize_srcu_expedited.
884 WARN_ON(old_memslots->generation & 1);
885 slots->generation = old_memslots->generation + 1;
887 rcu_assign_pointer(kvm->memslots[as_id], slots);
888 synchronize_srcu_expedited(&kvm->srcu);
891 * Increment the new memslot generation a second time. This prevents
892 * vm exits that race with memslot updates from caching a memslot
893 * generation that will (potentially) be valid forever.
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, 4, 8, ... while * address space 1 will
899 * use generations 2, 6, 10, 14, ...
901 slots->generation += KVM_ADDRESS_SPACE_NUM * 2 - 1;
903 kvm_arch_memslots_updated(kvm, slots);
909 * Allocate some memory and give it an address in the guest physical address
912 * Discontiguous memory is allowed, mostly for framebuffers.
914 * Must be called holding kvm->slots_lock for write.
916 int __kvm_set_memory_region(struct kvm *kvm,
917 const struct kvm_userspace_memory_region *mem)
921 unsigned long npages;
922 struct kvm_memory_slot *slot;
923 struct kvm_memory_slot old, new;
924 struct kvm_memslots *slots = NULL, *old_memslots;
926 enum kvm_mr_change change;
928 r = check_memory_region_flags(mem);
933 as_id = mem->slot >> 16;
936 /* General sanity checks */
937 if (mem->memory_size & (PAGE_SIZE - 1))
939 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
941 /* We can read the guest memory with __xxx_user() later on. */
942 if ((id < KVM_USER_MEM_SLOTS) &&
943 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
944 !access_ok(VERIFY_WRITE,
945 (void __user *)(unsigned long)mem->userspace_addr,
948 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM)
950 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
953 slot = id_to_memslot(__kvm_memslots(kvm, as_id), id);
954 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
955 npages = mem->memory_size >> PAGE_SHIFT;
957 if (npages > KVM_MEM_MAX_NR_PAGES)
963 new.base_gfn = base_gfn;
965 new.flags = mem->flags;
969 change = KVM_MR_CREATE;
970 else { /* Modify an existing slot. */
971 if ((mem->userspace_addr != old.userspace_addr) ||
972 (npages != old.npages) ||
973 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
976 if (base_gfn != old.base_gfn)
977 change = KVM_MR_MOVE;
978 else if (new.flags != old.flags)
979 change = KVM_MR_FLAGS_ONLY;
980 else { /* Nothing to change. */
989 change = KVM_MR_DELETE;
994 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
995 /* Check for overlaps */
997 kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) {
1000 if (!((base_gfn + npages <= slot->base_gfn) ||
1001 (base_gfn >= slot->base_gfn + slot->npages)))
1006 /* Free page dirty bitmap if unneeded */
1007 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
1008 new.dirty_bitmap = NULL;
1011 if (change == KVM_MR_CREATE) {
1012 new.userspace_addr = mem->userspace_addr;
1014 if (kvm_arch_create_memslot(kvm, &new, npages))
1018 /* Allocate page dirty bitmap if needed */
1019 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
1020 if (kvm_create_dirty_bitmap(&new) < 0)
1024 slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
1027 memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots));
1029 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
1030 slot = id_to_memslot(slots, id);
1031 slot->flags |= KVM_MEMSLOT_INVALID;
1033 old_memslots = install_new_memslots(kvm, as_id, slots);
1035 /* From this point no new shadow pages pointing to a deleted,
1036 * or moved, memslot will be created.
1038 * validation of sp->gfn happens in:
1039 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
1040 * - kvm_is_visible_gfn (mmu_check_roots)
1042 kvm_arch_flush_shadow_memslot(kvm, slot);
1045 * We can re-use the old_memslots from above, the only difference
1046 * from the currently installed memslots is the invalid flag. This
1047 * will get overwritten by update_memslots anyway.
1049 slots = old_memslots;
1052 r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
1056 /* actual memory is freed via old in kvm_free_memslot below */
1057 if (change == KVM_MR_DELETE) {
1058 new.dirty_bitmap = NULL;
1059 memset(&new.arch, 0, sizeof(new.arch));
1062 update_memslots(slots, &new, change);
1063 old_memslots = install_new_memslots(kvm, as_id, slots);
1065 kvm_arch_commit_memory_region(kvm, mem, &old, &new, change);
1067 kvm_free_memslot(kvm, &old, &new);
1068 kvfree(old_memslots);
1074 kvm_free_memslot(kvm, &new, &old);
1078 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
1080 int kvm_set_memory_region(struct kvm *kvm,
1081 const struct kvm_userspace_memory_region *mem)
1085 mutex_lock(&kvm->slots_lock);
1086 r = __kvm_set_memory_region(kvm, mem);
1087 mutex_unlock(&kvm->slots_lock);
1090 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1092 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1093 struct kvm_userspace_memory_region *mem)
1095 if ((u16)mem->slot >= KVM_USER_MEM_SLOTS)
1098 return kvm_set_memory_region(kvm, mem);
1101 int kvm_get_dirty_log(struct kvm *kvm,
1102 struct kvm_dirty_log *log, int *is_dirty)
1104 struct kvm_memslots *slots;
1105 struct kvm_memory_slot *memslot;
1108 unsigned long any = 0;
1110 as_id = log->slot >> 16;
1111 id = (u16)log->slot;
1112 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1115 slots = __kvm_memslots(kvm, as_id);
1116 memslot = id_to_memslot(slots, id);
1117 if (!memslot->dirty_bitmap)
1120 n = kvm_dirty_bitmap_bytes(memslot);
1122 for (i = 0; !any && i < n/sizeof(long); ++i)
1123 any = memslot->dirty_bitmap[i];
1125 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1132 EXPORT_SYMBOL_GPL(kvm_get_dirty_log);
1134 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1136 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1137 * are dirty write protect them for next write.
1138 * @kvm: pointer to kvm instance
1139 * @log: slot id and address to which we copy the log
1140 * @is_dirty: flag set if any page is dirty
1142 * We need to keep it in mind that VCPU threads can write to the bitmap
1143 * concurrently. So, to avoid losing track of dirty pages we keep the
1146 * 1. Take a snapshot of the bit and clear it if needed.
1147 * 2. Write protect the corresponding page.
1148 * 3. Copy the snapshot to the userspace.
1149 * 4. Upon return caller flushes TLB's if needed.
1151 * Between 2 and 4, the guest may write to the page using the remaining TLB
1152 * entry. This is not a problem because the page is reported dirty using
1153 * the snapshot taken before and step 4 ensures that writes done after
1154 * exiting to userspace will be logged for the next call.
1157 int kvm_get_dirty_log_protect(struct kvm *kvm,
1158 struct kvm_dirty_log *log, bool *is_dirty)
1160 struct kvm_memslots *slots;
1161 struct kvm_memory_slot *memslot;
1164 unsigned long *dirty_bitmap;
1165 unsigned long *dirty_bitmap_buffer;
1167 as_id = log->slot >> 16;
1168 id = (u16)log->slot;
1169 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1172 slots = __kvm_memslots(kvm, as_id);
1173 memslot = id_to_memslot(slots, id);
1175 dirty_bitmap = memslot->dirty_bitmap;
1179 n = kvm_dirty_bitmap_bytes(memslot);
1181 dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot);
1182 memset(dirty_bitmap_buffer, 0, n);
1184 spin_lock(&kvm->mmu_lock);
1186 for (i = 0; i < n / sizeof(long); i++) {
1190 if (!dirty_bitmap[i])
1195 mask = xchg(&dirty_bitmap[i], 0);
1196 dirty_bitmap_buffer[i] = mask;
1199 offset = i * BITS_PER_LONG;
1200 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
1205 spin_unlock(&kvm->mmu_lock);
1206 if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
1210 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect);
1213 bool kvm_largepages_enabled(void)
1215 return largepages_enabled;
1218 void kvm_disable_largepages(void)
1220 largepages_enabled = false;
1222 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
1224 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1226 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1228 EXPORT_SYMBOL_GPL(gfn_to_memslot);
1230 struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn)
1232 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn);
1235 bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1237 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1239 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
1240 memslot->flags & KVM_MEMSLOT_INVALID)
1245 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1247 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1249 struct vm_area_struct *vma;
1250 unsigned long addr, size;
1254 addr = gfn_to_hva(kvm, gfn);
1255 if (kvm_is_error_hva(addr))
1258 down_read(¤t->mm->mmap_sem);
1259 vma = find_vma(current->mm, addr);
1263 size = vma_kernel_pagesize(vma);
1266 up_read(¤t->mm->mmap_sem);
1271 static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1273 return slot->flags & KVM_MEM_READONLY;
1276 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1277 gfn_t *nr_pages, bool write)
1279 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1280 return KVM_HVA_ERR_BAD;
1282 if (memslot_is_readonly(slot) && write)
1283 return KVM_HVA_ERR_RO_BAD;
1286 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1288 return __gfn_to_hva_memslot(slot, gfn);
1291 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1294 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1297 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1300 return gfn_to_hva_many(slot, gfn, NULL);
1302 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1304 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1306 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1308 EXPORT_SYMBOL_GPL(gfn_to_hva);
1310 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn)
1312 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL);
1314 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva);
1317 * If writable is set to false, the hva returned by this function is only
1318 * allowed to be read.
1320 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot,
1321 gfn_t gfn, bool *writable)
1323 unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false);
1325 if (!kvm_is_error_hva(hva) && writable)
1326 *writable = !memslot_is_readonly(slot);
1331 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
1333 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1335 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1338 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable)
1340 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1342 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1345 static inline int check_user_page_hwpoison(unsigned long addr)
1347 int rc, flags = FOLL_HWPOISON | FOLL_WRITE;
1349 rc = get_user_pages(addr, 1, flags, NULL, NULL);
1350 return rc == -EHWPOISON;
1354 * The fast path to get the writable pfn which will be stored in @pfn,
1355 * true indicates success, otherwise false is returned. It's also the
1356 * only part that runs if we can are in atomic context.
1358 static bool hva_to_pfn_fast(unsigned long addr, bool write_fault,
1359 bool *writable, kvm_pfn_t *pfn)
1361 struct page *page[1];
1365 * Fast pin a writable pfn only if it is a write fault request
1366 * or the caller allows to map a writable pfn for a read fault
1369 if (!(write_fault || writable))
1372 npages = __get_user_pages_fast(addr, 1, 1, page);
1374 *pfn = page_to_pfn(page[0]);
1385 * The slow path to get the pfn of the specified host virtual address,
1386 * 1 indicates success, -errno is returned if error is detected.
1388 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1389 bool *writable, kvm_pfn_t *pfn)
1391 unsigned int flags = FOLL_HWPOISON;
1398 *writable = write_fault;
1401 flags |= FOLL_WRITE;
1403 flags |= FOLL_NOWAIT;
1405 npages = get_user_pages_unlocked(addr, 1, &page, flags);
1409 /* map read fault as writable if possible */
1410 if (unlikely(!write_fault) && writable) {
1413 if (__get_user_pages_fast(addr, 1, 1, &wpage) == 1) {
1419 *pfn = page_to_pfn(page);
1423 static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1425 if (unlikely(!(vma->vm_flags & VM_READ)))
1428 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1434 static int hva_to_pfn_remapped(struct vm_area_struct *vma,
1435 unsigned long addr, bool *async,
1436 bool write_fault, bool *writable,
1442 r = follow_pfn(vma, addr, &pfn);
1445 * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
1446 * not call the fault handler, so do it here.
1448 bool unlocked = false;
1449 r = fixup_user_fault(current, current->mm, addr,
1450 (write_fault ? FAULT_FLAG_WRITE : 0),
1457 r = follow_pfn(vma, addr, &pfn);
1467 * Get a reference here because callers of *hva_to_pfn* and
1468 * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the
1469 * returned pfn. This is only needed if the VMA has VM_MIXEDMAP
1470 * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will
1471 * simply do nothing for reserved pfns.
1473 * Whoever called remap_pfn_range is also going to call e.g.
1474 * unmap_mapping_range before the underlying pages are freed,
1475 * causing a call to our MMU notifier.
1484 * Pin guest page in memory and return its pfn.
1485 * @addr: host virtual address which maps memory to the guest
1486 * @atomic: whether this function can sleep
1487 * @async: whether this function need to wait IO complete if the
1488 * host page is not in the memory
1489 * @write_fault: whether we should get a writable host page
1490 * @writable: whether it allows to map a writable host page for !@write_fault
1492 * The function will map a writable host page for these two cases:
1493 * 1): @write_fault = true
1494 * 2): @write_fault = false && @writable, @writable will tell the caller
1495 * whether the mapping is writable.
1497 static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1498 bool write_fault, bool *writable)
1500 struct vm_area_struct *vma;
1504 /* we can do it either atomically or asynchronously, not both */
1505 BUG_ON(atomic && async);
1507 if (hva_to_pfn_fast(addr, write_fault, writable, &pfn))
1511 return KVM_PFN_ERR_FAULT;
1513 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1517 down_read(¤t->mm->mmap_sem);
1518 if (npages == -EHWPOISON ||
1519 (!async && check_user_page_hwpoison(addr))) {
1520 pfn = KVM_PFN_ERR_HWPOISON;
1525 vma = find_vma_intersection(current->mm, addr, addr + 1);
1528 pfn = KVM_PFN_ERR_FAULT;
1529 else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) {
1530 r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn);
1534 pfn = KVM_PFN_ERR_FAULT;
1536 if (async && vma_is_valid(vma, write_fault))
1538 pfn = KVM_PFN_ERR_FAULT;
1541 up_read(¤t->mm->mmap_sem);
1545 kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
1546 bool atomic, bool *async, bool write_fault,
1549 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1551 if (addr == KVM_HVA_ERR_RO_BAD) {
1554 return KVM_PFN_ERR_RO_FAULT;
1557 if (kvm_is_error_hva(addr)) {
1560 return KVM_PFN_NOSLOT;
1563 /* Do not map writable pfn in the readonly memslot. */
1564 if (writable && memslot_is_readonly(slot)) {
1569 return hva_to_pfn(addr, atomic, async, write_fault,
1572 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot);
1574 kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1577 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL,
1578 write_fault, writable);
1580 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1582 kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1584 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1586 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot);
1588 kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1590 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1592 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1594 kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1596 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn);
1598 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1600 kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn)
1602 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1604 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic);
1606 kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1608 return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn);
1610 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1612 kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
1614 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1616 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn);
1618 int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1619 struct page **pages, int nr_pages)
1624 addr = gfn_to_hva_many(slot, gfn, &entry);
1625 if (kvm_is_error_hva(addr))
1628 if (entry < nr_pages)
1631 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1633 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1635 static struct page *kvm_pfn_to_page(kvm_pfn_t pfn)
1637 if (is_error_noslot_pfn(pfn))
1638 return KVM_ERR_PTR_BAD_PAGE;
1640 if (kvm_is_reserved_pfn(pfn)) {
1642 return KVM_ERR_PTR_BAD_PAGE;
1645 return pfn_to_page(pfn);
1648 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1652 pfn = gfn_to_pfn(kvm, gfn);
1654 return kvm_pfn_to_page(pfn);
1656 EXPORT_SYMBOL_GPL(gfn_to_page);
1658 struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn)
1662 pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn);
1664 return kvm_pfn_to_page(pfn);
1666 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page);
1668 void kvm_release_page_clean(struct page *page)
1670 WARN_ON(is_error_page(page));
1672 kvm_release_pfn_clean(page_to_pfn(page));
1674 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1676 void kvm_release_pfn_clean(kvm_pfn_t pfn)
1678 if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn))
1679 put_page(pfn_to_page(pfn));
1681 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1683 void kvm_release_page_dirty(struct page *page)
1685 WARN_ON(is_error_page(page));
1687 kvm_release_pfn_dirty(page_to_pfn(page));
1689 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1691 void kvm_release_pfn_dirty(kvm_pfn_t pfn)
1693 kvm_set_pfn_dirty(pfn);
1694 kvm_release_pfn_clean(pfn);
1696 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1698 void kvm_set_pfn_dirty(kvm_pfn_t pfn)
1700 if (!kvm_is_reserved_pfn(pfn)) {
1701 struct page *page = pfn_to_page(pfn);
1703 if (!PageReserved(page))
1707 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1709 void kvm_set_pfn_accessed(kvm_pfn_t pfn)
1711 if (!kvm_is_reserved_pfn(pfn))
1712 mark_page_accessed(pfn_to_page(pfn));
1714 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1716 void kvm_get_pfn(kvm_pfn_t pfn)
1718 if (!kvm_is_reserved_pfn(pfn))
1719 get_page(pfn_to_page(pfn));
1721 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1723 static int next_segment(unsigned long len, int offset)
1725 if (len > PAGE_SIZE - offset)
1726 return PAGE_SIZE - offset;
1731 static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn,
1732 void *data, int offset, int len)
1737 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1738 if (kvm_is_error_hva(addr))
1740 r = __copy_from_user(data, (void __user *)addr + offset, len);
1746 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1749 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1751 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1753 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1755 int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data,
1756 int offset, int len)
1758 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1760 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1762 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page);
1764 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1766 gfn_t gfn = gpa >> PAGE_SHIFT;
1768 int offset = offset_in_page(gpa);
1771 while ((seg = next_segment(len, offset)) != 0) {
1772 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1782 EXPORT_SYMBOL_GPL(kvm_read_guest);
1784 int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len)
1786 gfn_t gfn = gpa >> PAGE_SHIFT;
1788 int offset = offset_in_page(gpa);
1791 while ((seg = next_segment(len, offset)) != 0) {
1792 ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg);
1802 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest);
1804 static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1805 void *data, int offset, unsigned long len)
1810 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1811 if (kvm_is_error_hva(addr))
1813 pagefault_disable();
1814 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1821 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1824 gfn_t gfn = gpa >> PAGE_SHIFT;
1825 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1826 int offset = offset_in_page(gpa);
1828 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1830 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic);
1832 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
1833 void *data, unsigned long len)
1835 gfn_t gfn = gpa >> PAGE_SHIFT;
1836 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1837 int offset = offset_in_page(gpa);
1839 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1841 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);
1843 static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn,
1844 const void *data, int offset, int len)
1849 addr = gfn_to_hva_memslot(memslot, gfn);
1850 if (kvm_is_error_hva(addr))
1852 r = __copy_to_user((void __user *)addr + offset, data, len);
1855 mark_page_dirty_in_slot(memslot, gfn);
1859 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn,
1860 const void *data, int offset, int len)
1862 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1864 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1866 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1868 int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
1869 const void *data, int offset, int len)
1871 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1873 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1875 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page);
1877 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1880 gfn_t gfn = gpa >> PAGE_SHIFT;
1882 int offset = offset_in_page(gpa);
1885 while ((seg = next_segment(len, offset)) != 0) {
1886 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1896 EXPORT_SYMBOL_GPL(kvm_write_guest);
1898 int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
1901 gfn_t gfn = gpa >> PAGE_SHIFT;
1903 int offset = offset_in_page(gpa);
1906 while ((seg = next_segment(len, offset)) != 0) {
1907 ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg);
1917 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest);
1919 static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots,
1920 struct gfn_to_hva_cache *ghc,
1921 gpa_t gpa, unsigned long len)
1923 int offset = offset_in_page(gpa);
1924 gfn_t start_gfn = gpa >> PAGE_SHIFT;
1925 gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
1926 gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
1927 gfn_t nr_pages_avail;
1930 ghc->generation = slots->generation;
1932 ghc->memslot = __gfn_to_memslot(slots, start_gfn);
1933 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL);
1934 if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) {
1938 * If the requested region crosses two memslots, we still
1939 * verify that the entire region is valid here.
1941 while (start_gfn <= end_gfn) {
1943 ghc->memslot = __gfn_to_memslot(slots, start_gfn);
1944 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
1946 if (kvm_is_error_hva(ghc->hva))
1948 start_gfn += nr_pages_avail;
1950 /* Use the slow path for cross page reads and writes. */
1951 ghc->memslot = NULL;
1956 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1957 gpa_t gpa, unsigned long len)
1959 struct kvm_memslots *slots = kvm_memslots(kvm);
1960 return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len);
1962 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1964 int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1965 void *data, int offset, unsigned long len)
1967 struct kvm_memslots *slots = kvm_memslots(kvm);
1969 gpa_t gpa = ghc->gpa + offset;
1971 BUG_ON(len + offset > ghc->len);
1973 if (slots->generation != ghc->generation)
1974 __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
1976 if (unlikely(!ghc->memslot))
1977 return kvm_write_guest(kvm, gpa, data, len);
1979 if (kvm_is_error_hva(ghc->hva))
1982 r = __copy_to_user((void __user *)ghc->hva + offset, data, len);
1985 mark_page_dirty_in_slot(ghc->memslot, gpa >> PAGE_SHIFT);
1989 EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached);
1991 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1992 void *data, unsigned long len)
1994 return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len);
1996 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1998 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1999 void *data, unsigned long len)
2001 struct kvm_memslots *slots = kvm_memslots(kvm);
2004 BUG_ON(len > ghc->len);
2006 if (slots->generation != ghc->generation)
2007 __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
2009 if (unlikely(!ghc->memslot))
2010 return kvm_read_guest(kvm, ghc->gpa, data, len);
2012 if (kvm_is_error_hva(ghc->hva))
2015 r = __copy_from_user(data, (void __user *)ghc->hva, len);
2021 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
2023 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
2025 const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2027 return kvm_write_guest_page(kvm, gfn, zero_page, offset, len);
2029 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
2031 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
2033 gfn_t gfn = gpa >> PAGE_SHIFT;
2035 int offset = offset_in_page(gpa);
2038 while ((seg = next_segment(len, offset)) != 0) {
2039 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
2048 EXPORT_SYMBOL_GPL(kvm_clear_guest);
2050 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot,
2053 if (memslot && memslot->dirty_bitmap) {
2054 unsigned long rel_gfn = gfn - memslot->base_gfn;
2056 set_bit_le(rel_gfn, memslot->dirty_bitmap);
2060 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
2062 struct kvm_memory_slot *memslot;
2064 memslot = gfn_to_memslot(kvm, gfn);
2065 mark_page_dirty_in_slot(memslot, gfn);
2067 EXPORT_SYMBOL_GPL(mark_page_dirty);
2069 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn)
2071 struct kvm_memory_slot *memslot;
2073 memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2074 mark_page_dirty_in_slot(memslot, gfn);
2076 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty);
2078 void kvm_sigset_activate(struct kvm_vcpu *vcpu)
2080 if (!vcpu->sigset_active)
2084 * This does a lockless modification of ->real_blocked, which is fine
2085 * because, only current can change ->real_blocked and all readers of
2086 * ->real_blocked don't care as long ->real_blocked is always a subset
2089 sigprocmask(SIG_SETMASK, &vcpu->sigset, ¤t->real_blocked);
2092 void kvm_sigset_deactivate(struct kvm_vcpu *vcpu)
2094 if (!vcpu->sigset_active)
2097 sigprocmask(SIG_SETMASK, ¤t->real_blocked, NULL);
2098 sigemptyset(¤t->real_blocked);
2101 static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
2103 unsigned int old, val, grow;
2105 old = val = vcpu->halt_poll_ns;
2106 grow = READ_ONCE(halt_poll_ns_grow);
2108 if (val == 0 && grow)
2113 if (val > halt_poll_ns)
2116 vcpu->halt_poll_ns = val;
2117 trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old);
2120 static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
2122 unsigned int old, val, shrink;
2124 old = val = vcpu->halt_poll_ns;
2125 shrink = READ_ONCE(halt_poll_ns_shrink);
2131 vcpu->halt_poll_ns = val;
2132 trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old);
2135 static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
2138 int idx = srcu_read_lock(&vcpu->kvm->srcu);
2140 if (kvm_arch_vcpu_runnable(vcpu)) {
2141 kvm_make_request(KVM_REQ_UNHALT, vcpu);
2144 if (kvm_cpu_has_pending_timer(vcpu))
2146 if (signal_pending(current))
2151 srcu_read_unlock(&vcpu->kvm->srcu, idx);
2156 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
2158 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
2161 DECLARE_SWAITQUEUE(wait);
2162 bool waited = false;
2165 start = cur = ktime_get();
2166 if (vcpu->halt_poll_ns) {
2167 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
2169 ++vcpu->stat.halt_attempted_poll;
2172 * This sets KVM_REQ_UNHALT if an interrupt
2175 if (kvm_vcpu_check_block(vcpu) < 0) {
2176 ++vcpu->stat.halt_successful_poll;
2177 if (!vcpu_valid_wakeup(vcpu))
2178 ++vcpu->stat.halt_poll_invalid;
2182 } while (single_task_running() && ktime_before(cur, stop));
2185 kvm_arch_vcpu_blocking(vcpu);
2188 prepare_to_swait_exclusive(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
2190 if (kvm_vcpu_check_block(vcpu) < 0)
2197 finish_swait(&vcpu->wq, &wait);
2200 kvm_arch_vcpu_unblocking(vcpu);
2202 block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
2204 if (!vcpu_valid_wakeup(vcpu))
2205 shrink_halt_poll_ns(vcpu);
2206 else if (halt_poll_ns) {
2207 if (block_ns <= vcpu->halt_poll_ns)
2209 /* we had a long block, shrink polling */
2210 else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns)
2211 shrink_halt_poll_ns(vcpu);
2212 /* we had a short halt and our poll time is too small */
2213 else if (vcpu->halt_poll_ns < halt_poll_ns &&
2214 block_ns < halt_poll_ns)
2215 grow_halt_poll_ns(vcpu);
2217 vcpu->halt_poll_ns = 0;
2219 trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu));
2220 kvm_arch_vcpu_block_finish(vcpu);
2222 EXPORT_SYMBOL_GPL(kvm_vcpu_block);
2224 bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
2226 struct swait_queue_head *wqp;
2228 wqp = kvm_arch_vcpu_wq(vcpu);
2229 if (swq_has_sleeper(wqp)) {
2231 ++vcpu->stat.halt_wakeup;
2237 EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up);
2241 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2243 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
2246 int cpu = vcpu->cpu;
2248 if (kvm_vcpu_wake_up(vcpu))
2252 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
2253 if (kvm_arch_vcpu_should_kick(vcpu))
2254 smp_send_reschedule(cpu);
2257 EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
2258 #endif /* !CONFIG_S390 */
2260 int kvm_vcpu_yield_to(struct kvm_vcpu *target)
2263 struct task_struct *task = NULL;
2267 pid = rcu_dereference(target->pid);
2269 task = get_pid_task(pid, PIDTYPE_PID);
2273 ret = yield_to(task, 1);
2274 put_task_struct(task);
2278 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
2281 * Helper that checks whether a VCPU is eligible for directed yield.
2282 * Most eligible candidate to yield is decided by following heuristics:
2284 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2285 * (preempted lock holder), indicated by @in_spin_loop.
2286 * Set at the beiginning and cleared at the end of interception/PLE handler.
2288 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2289 * chance last time (mostly it has become eligible now since we have probably
2290 * yielded to lockholder in last iteration. This is done by toggling
2291 * @dy_eligible each time a VCPU checked for eligibility.)
2293 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2294 * to preempted lock-holder could result in wrong VCPU selection and CPU
2295 * burning. Giving priority for a potential lock-holder increases lock
2298 * Since algorithm is based on heuristics, accessing another VCPU data without
2299 * locking does not harm. It may result in trying to yield to same VCPU, fail
2300 * and continue with next VCPU and so on.
2302 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
2304 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2307 eligible = !vcpu->spin_loop.in_spin_loop ||
2308 vcpu->spin_loop.dy_eligible;
2310 if (vcpu->spin_loop.in_spin_loop)
2311 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
2319 void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode)
2321 struct kvm *kvm = me->kvm;
2322 struct kvm_vcpu *vcpu;
2323 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
2329 kvm_vcpu_set_in_spin_loop(me, true);
2331 * We boost the priority of a VCPU that is runnable but not
2332 * currently running, because it got preempted by something
2333 * else and called schedule in __vcpu_run. Hopefully that
2334 * VCPU is holding the lock that we need and will release it.
2335 * We approximate round-robin by starting at the last boosted VCPU.
2337 for (pass = 0; pass < 2 && !yielded && try; pass++) {
2338 kvm_for_each_vcpu(i, vcpu, kvm) {
2339 if (!pass && i <= last_boosted_vcpu) {
2340 i = last_boosted_vcpu;
2342 } else if (pass && i > last_boosted_vcpu)
2344 if (!READ_ONCE(vcpu->preempted))
2348 if (swait_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
2350 if (yield_to_kernel_mode && !kvm_arch_vcpu_in_kernel(vcpu))
2352 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
2355 yielded = kvm_vcpu_yield_to(vcpu);
2357 kvm->last_boosted_vcpu = i;
2359 } else if (yielded < 0) {
2366 kvm_vcpu_set_in_spin_loop(me, false);
2368 /* Ensure vcpu is not eligible during next spinloop */
2369 kvm_vcpu_set_dy_eligible(me, false);
2371 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
2373 static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf)
2375 struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data;
2378 if (vmf->pgoff == 0)
2379 page = virt_to_page(vcpu->run);
2381 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
2382 page = virt_to_page(vcpu->arch.pio_data);
2384 #ifdef CONFIG_KVM_MMIO
2385 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
2386 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
2389 return kvm_arch_vcpu_fault(vcpu, vmf);
2395 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
2396 .fault = kvm_vcpu_fault,
2399 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2401 vma->vm_ops = &kvm_vcpu_vm_ops;
2405 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2407 struct kvm_vcpu *vcpu = filp->private_data;
2409 debugfs_remove_recursive(vcpu->debugfs_dentry);
2410 kvm_put_kvm(vcpu->kvm);
2414 static struct file_operations kvm_vcpu_fops = {
2415 .release = kvm_vcpu_release,
2416 .unlocked_ioctl = kvm_vcpu_ioctl,
2417 .mmap = kvm_vcpu_mmap,
2418 .llseek = noop_llseek,
2419 KVM_COMPAT(kvm_vcpu_compat_ioctl),
2423 * Allocates an inode for the vcpu.
2425 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2427 char name[8 + 1 + ITOA_MAX_LEN + 1];
2429 snprintf(name, sizeof(name), "kvm-vcpu:%d", vcpu->vcpu_id);
2430 return anon_inode_getfd(name, &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
2433 static int kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
2435 char dir_name[ITOA_MAX_LEN * 2];
2438 if (!kvm_arch_has_vcpu_debugfs())
2441 if (!debugfs_initialized())
2444 snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id);
2445 vcpu->debugfs_dentry = debugfs_create_dir(dir_name,
2446 vcpu->kvm->debugfs_dentry);
2447 if (!vcpu->debugfs_dentry)
2450 ret = kvm_arch_create_vcpu_debugfs(vcpu);
2452 debugfs_remove_recursive(vcpu->debugfs_dentry);
2460 * Creates some virtual cpus. Good luck creating more than one.
2462 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
2465 struct kvm_vcpu *vcpu;
2467 if (id >= KVM_MAX_VCPU_ID)
2470 mutex_lock(&kvm->lock);
2471 if (kvm->created_vcpus == KVM_MAX_VCPUS) {
2472 mutex_unlock(&kvm->lock);
2476 kvm->created_vcpus++;
2477 mutex_unlock(&kvm->lock);
2479 vcpu = kvm_arch_vcpu_create(kvm, id);
2482 goto vcpu_decrement;
2485 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2487 r = kvm_arch_vcpu_setup(vcpu);
2491 r = kvm_create_vcpu_debugfs(vcpu);
2495 mutex_lock(&kvm->lock);
2496 if (kvm_get_vcpu_by_id(kvm, id)) {
2498 goto unlock_vcpu_destroy;
2501 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
2503 /* Now it's all set up, let userspace reach it */
2505 r = create_vcpu_fd(vcpu);
2508 goto unlock_vcpu_destroy;
2511 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
2514 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2515 * before kvm->online_vcpu's incremented value.
2518 atomic_inc(&kvm->online_vcpus);
2520 mutex_unlock(&kvm->lock);
2521 kvm_arch_vcpu_postcreate(vcpu);
2524 unlock_vcpu_destroy:
2525 mutex_unlock(&kvm->lock);
2526 debugfs_remove_recursive(vcpu->debugfs_dentry);
2528 kvm_arch_vcpu_destroy(vcpu);
2530 mutex_lock(&kvm->lock);
2531 kvm->created_vcpus--;
2532 mutex_unlock(&kvm->lock);
2536 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2539 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2540 vcpu->sigset_active = 1;
2541 vcpu->sigset = *sigset;
2543 vcpu->sigset_active = 0;
2547 static long kvm_vcpu_ioctl(struct file *filp,
2548 unsigned int ioctl, unsigned long arg)
2550 struct kvm_vcpu *vcpu = filp->private_data;
2551 void __user *argp = (void __user *)arg;
2553 struct kvm_fpu *fpu = NULL;
2554 struct kvm_sregs *kvm_sregs = NULL;
2556 if (vcpu->kvm->mm != current->mm)
2559 if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
2563 * Some architectures have vcpu ioctls that are asynchronous to vcpu
2564 * execution; mutex_lock() would break them.
2566 r = kvm_arch_vcpu_async_ioctl(filp, ioctl, arg);
2567 if (r != -ENOIOCTLCMD)
2570 if (mutex_lock_killable(&vcpu->mutex))
2578 oldpid = rcu_access_pointer(vcpu->pid);
2579 if (unlikely(oldpid != task_pid(current))) {
2580 /* The thread running this VCPU changed. */
2583 r = kvm_arch_vcpu_run_pid_change(vcpu);
2587 newpid = get_task_pid(current, PIDTYPE_PID);
2588 rcu_assign_pointer(vcpu->pid, newpid);
2593 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
2594 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
2597 case KVM_GET_REGS: {
2598 struct kvm_regs *kvm_regs;
2601 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
2604 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
2608 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
2615 case KVM_SET_REGS: {
2616 struct kvm_regs *kvm_regs;
2619 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
2620 if (IS_ERR(kvm_regs)) {
2621 r = PTR_ERR(kvm_regs);
2624 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2628 case KVM_GET_SREGS: {
2629 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
2633 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2637 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2642 case KVM_SET_SREGS: {
2643 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2644 if (IS_ERR(kvm_sregs)) {
2645 r = PTR_ERR(kvm_sregs);
2649 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2652 case KVM_GET_MP_STATE: {
2653 struct kvm_mp_state mp_state;
2655 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2659 if (copy_to_user(argp, &mp_state, sizeof(mp_state)))
2664 case KVM_SET_MP_STATE: {
2665 struct kvm_mp_state mp_state;
2668 if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
2670 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2673 case KVM_TRANSLATE: {
2674 struct kvm_translation tr;
2677 if (copy_from_user(&tr, argp, sizeof(tr)))
2679 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2683 if (copy_to_user(argp, &tr, sizeof(tr)))
2688 case KVM_SET_GUEST_DEBUG: {
2689 struct kvm_guest_debug dbg;
2692 if (copy_from_user(&dbg, argp, sizeof(dbg)))
2694 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2697 case KVM_SET_SIGNAL_MASK: {
2698 struct kvm_signal_mask __user *sigmask_arg = argp;
2699 struct kvm_signal_mask kvm_sigmask;
2700 sigset_t sigset, *p;
2705 if (copy_from_user(&kvm_sigmask, argp,
2706 sizeof(kvm_sigmask)))
2709 if (kvm_sigmask.len != sizeof(sigset))
2712 if (copy_from_user(&sigset, sigmask_arg->sigset,
2717 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2721 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2725 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2729 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2735 fpu = memdup_user(argp, sizeof(*fpu));
2741 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2745 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2748 mutex_unlock(&vcpu->mutex);
2754 #ifdef CONFIG_KVM_COMPAT
2755 static long kvm_vcpu_compat_ioctl(struct file *filp,
2756 unsigned int ioctl, unsigned long arg)
2758 struct kvm_vcpu *vcpu = filp->private_data;
2759 void __user *argp = compat_ptr(arg);
2762 if (vcpu->kvm->mm != current->mm)
2766 case KVM_SET_SIGNAL_MASK: {
2767 struct kvm_signal_mask __user *sigmask_arg = argp;
2768 struct kvm_signal_mask kvm_sigmask;
2773 if (copy_from_user(&kvm_sigmask, argp,
2774 sizeof(kvm_sigmask)))
2777 if (kvm_sigmask.len != sizeof(compat_sigset_t))
2780 if (get_compat_sigset(&sigset, (void *)sigmask_arg->sigset))
2782 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2784 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
2788 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2796 static int kvm_device_ioctl_attr(struct kvm_device *dev,
2797 int (*accessor)(struct kvm_device *dev,
2798 struct kvm_device_attr *attr),
2801 struct kvm_device_attr attr;
2806 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2809 return accessor(dev, &attr);
2812 static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
2815 struct kvm_device *dev = filp->private_data;
2818 case KVM_SET_DEVICE_ATTR:
2819 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
2820 case KVM_GET_DEVICE_ATTR:
2821 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
2822 case KVM_HAS_DEVICE_ATTR:
2823 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
2825 if (dev->ops->ioctl)
2826 return dev->ops->ioctl(dev, ioctl, arg);
2832 static int kvm_device_release(struct inode *inode, struct file *filp)
2834 struct kvm_device *dev = filp->private_data;
2835 struct kvm *kvm = dev->kvm;
2841 static const struct file_operations kvm_device_fops = {
2842 .unlocked_ioctl = kvm_device_ioctl,
2843 .release = kvm_device_release,
2844 KVM_COMPAT(kvm_device_ioctl),
2847 struct kvm_device *kvm_device_from_filp(struct file *filp)
2849 if (filp->f_op != &kvm_device_fops)
2852 return filp->private_data;
2855 static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
2856 #ifdef CONFIG_KVM_MPIC
2857 [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops,
2858 [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops,
2862 int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
2864 if (type >= ARRAY_SIZE(kvm_device_ops_table))
2867 if (kvm_device_ops_table[type] != NULL)
2870 kvm_device_ops_table[type] = ops;
2874 void kvm_unregister_device_ops(u32 type)
2876 if (kvm_device_ops_table[type] != NULL)
2877 kvm_device_ops_table[type] = NULL;
2880 static int kvm_ioctl_create_device(struct kvm *kvm,
2881 struct kvm_create_device *cd)
2883 struct kvm_device_ops *ops = NULL;
2884 struct kvm_device *dev;
2885 bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
2888 if (cd->type >= ARRAY_SIZE(kvm_device_ops_table))
2891 ops = kvm_device_ops_table[cd->type];
2898 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2905 mutex_lock(&kvm->lock);
2906 ret = ops->create(dev, cd->type);
2908 mutex_unlock(&kvm->lock);
2912 list_add(&dev->vm_node, &kvm->devices);
2913 mutex_unlock(&kvm->lock);
2918 ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC);
2920 mutex_lock(&kvm->lock);
2921 list_del(&dev->vm_node);
2922 mutex_unlock(&kvm->lock);
2932 static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
2935 case KVM_CAP_USER_MEMORY:
2936 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2937 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2938 case KVM_CAP_INTERNAL_ERROR_DATA:
2939 #ifdef CONFIG_HAVE_KVM_MSI
2940 case KVM_CAP_SIGNAL_MSI:
2942 #ifdef CONFIG_HAVE_KVM_IRQFD
2944 case KVM_CAP_IRQFD_RESAMPLE:
2946 case KVM_CAP_IOEVENTFD_ANY_LENGTH:
2947 case KVM_CAP_CHECK_EXTENSION_VM:
2949 #ifdef CONFIG_KVM_MMIO
2950 case KVM_CAP_COALESCED_MMIO:
2951 return KVM_COALESCED_MMIO_PAGE_OFFSET;
2953 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2954 case KVM_CAP_IRQ_ROUTING:
2955 return KVM_MAX_IRQ_ROUTES;
2957 #if KVM_ADDRESS_SPACE_NUM > 1
2958 case KVM_CAP_MULTI_ADDRESS_SPACE:
2959 return KVM_ADDRESS_SPACE_NUM;
2961 case KVM_CAP_MAX_VCPU_ID:
2962 return KVM_MAX_VCPU_ID;
2966 return kvm_vm_ioctl_check_extension(kvm, arg);
2969 static long kvm_vm_ioctl(struct file *filp,
2970 unsigned int ioctl, unsigned long arg)
2972 struct kvm *kvm = filp->private_data;
2973 void __user *argp = (void __user *)arg;
2976 if (kvm->mm != current->mm)
2979 case KVM_CREATE_VCPU:
2980 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2982 case KVM_SET_USER_MEMORY_REGION: {
2983 struct kvm_userspace_memory_region kvm_userspace_mem;
2986 if (copy_from_user(&kvm_userspace_mem, argp,
2987 sizeof(kvm_userspace_mem)))
2990 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
2993 case KVM_GET_DIRTY_LOG: {
2994 struct kvm_dirty_log log;
2997 if (copy_from_user(&log, argp, sizeof(log)))
2999 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3002 #ifdef CONFIG_KVM_MMIO
3003 case KVM_REGISTER_COALESCED_MMIO: {
3004 struct kvm_coalesced_mmio_zone zone;
3007 if (copy_from_user(&zone, argp, sizeof(zone)))
3009 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
3012 case KVM_UNREGISTER_COALESCED_MMIO: {
3013 struct kvm_coalesced_mmio_zone zone;
3016 if (copy_from_user(&zone, argp, sizeof(zone)))
3018 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
3023 struct kvm_irqfd data;
3026 if (copy_from_user(&data, argp, sizeof(data)))
3028 r = kvm_irqfd(kvm, &data);
3031 case KVM_IOEVENTFD: {
3032 struct kvm_ioeventfd data;
3035 if (copy_from_user(&data, argp, sizeof(data)))
3037 r = kvm_ioeventfd(kvm, &data);
3040 #ifdef CONFIG_HAVE_KVM_MSI
3041 case KVM_SIGNAL_MSI: {
3045 if (copy_from_user(&msi, argp, sizeof(msi)))
3047 r = kvm_send_userspace_msi(kvm, &msi);
3051 #ifdef __KVM_HAVE_IRQ_LINE
3052 case KVM_IRQ_LINE_STATUS:
3053 case KVM_IRQ_LINE: {
3054 struct kvm_irq_level irq_event;
3057 if (copy_from_user(&irq_event, argp, sizeof(irq_event)))
3060 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
3061 ioctl == KVM_IRQ_LINE_STATUS);
3066 if (ioctl == KVM_IRQ_LINE_STATUS) {
3067 if (copy_to_user(argp, &irq_event, sizeof(irq_event)))
3075 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3076 case KVM_SET_GSI_ROUTING: {
3077 struct kvm_irq_routing routing;
3078 struct kvm_irq_routing __user *urouting;
3079 struct kvm_irq_routing_entry *entries = NULL;
3082 if (copy_from_user(&routing, argp, sizeof(routing)))
3085 if (!kvm_arch_can_set_irq_routing(kvm))
3087 if (routing.nr > KVM_MAX_IRQ_ROUTES)
3093 entries = vmalloc(array_size(sizeof(*entries),
3099 if (copy_from_user(entries, urouting->entries,
3100 routing.nr * sizeof(*entries)))
3101 goto out_free_irq_routing;
3103 r = kvm_set_irq_routing(kvm, entries, routing.nr,
3105 out_free_irq_routing:
3109 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
3110 case KVM_CREATE_DEVICE: {
3111 struct kvm_create_device cd;
3114 if (copy_from_user(&cd, argp, sizeof(cd)))
3117 r = kvm_ioctl_create_device(kvm, &cd);
3122 if (copy_to_user(argp, &cd, sizeof(cd)))
3128 case KVM_CHECK_EXTENSION:
3129 r = kvm_vm_ioctl_check_extension_generic(kvm, arg);
3132 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
3138 #ifdef CONFIG_KVM_COMPAT
3139 struct compat_kvm_dirty_log {
3143 compat_uptr_t dirty_bitmap; /* one bit per page */
3148 static long kvm_vm_compat_ioctl(struct file *filp,
3149 unsigned int ioctl, unsigned long arg)
3151 struct kvm *kvm = filp->private_data;
3154 if (kvm->mm != current->mm)
3157 case KVM_GET_DIRTY_LOG: {
3158 struct compat_kvm_dirty_log compat_log;
3159 struct kvm_dirty_log log;
3161 if (copy_from_user(&compat_log, (void __user *)arg,
3162 sizeof(compat_log)))
3164 log.slot = compat_log.slot;
3165 log.padding1 = compat_log.padding1;
3166 log.padding2 = compat_log.padding2;
3167 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
3169 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3173 r = kvm_vm_ioctl(filp, ioctl, arg);
3179 static struct file_operations kvm_vm_fops = {
3180 .release = kvm_vm_release,
3181 .unlocked_ioctl = kvm_vm_ioctl,
3182 .llseek = noop_llseek,
3183 KVM_COMPAT(kvm_vm_compat_ioctl),
3186 static int kvm_dev_ioctl_create_vm(unsigned long type)
3192 kvm = kvm_create_vm(type);
3194 return PTR_ERR(kvm);
3195 #ifdef CONFIG_KVM_MMIO
3196 r = kvm_coalesced_mmio_init(kvm);
3200 r = get_unused_fd_flags(O_CLOEXEC);
3204 file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
3212 * Don't call kvm_put_kvm anymore at this point; file->f_op is
3213 * already set, with ->release() being kvm_vm_release(). In error
3214 * cases it will be called by the final fput(file) and will take
3215 * care of doing kvm_put_kvm(kvm).
3217 if (kvm_create_vm_debugfs(kvm, r) < 0) {
3222 kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm);
3224 fd_install(r, file);
3232 static long kvm_dev_ioctl(struct file *filp,
3233 unsigned int ioctl, unsigned long arg)
3238 case KVM_GET_API_VERSION:
3241 r = KVM_API_VERSION;
3244 r = kvm_dev_ioctl_create_vm(arg);
3246 case KVM_CHECK_EXTENSION:
3247 r = kvm_vm_ioctl_check_extension_generic(NULL, arg);
3249 case KVM_GET_VCPU_MMAP_SIZE:
3252 r = PAGE_SIZE; /* struct kvm_run */
3254 r += PAGE_SIZE; /* pio data page */
3256 #ifdef CONFIG_KVM_MMIO
3257 r += PAGE_SIZE; /* coalesced mmio ring page */
3260 case KVM_TRACE_ENABLE:
3261 case KVM_TRACE_PAUSE:
3262 case KVM_TRACE_DISABLE:
3266 return kvm_arch_dev_ioctl(filp, ioctl, arg);
3272 static struct file_operations kvm_chardev_ops = {
3273 .unlocked_ioctl = kvm_dev_ioctl,
3274 .llseek = noop_llseek,
3275 KVM_COMPAT(kvm_dev_ioctl),
3278 static struct miscdevice kvm_dev = {
3284 static void hardware_enable_nolock(void *junk)
3286 int cpu = raw_smp_processor_id();
3289 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
3292 cpumask_set_cpu(cpu, cpus_hardware_enabled);
3294 r = kvm_arch_hardware_enable();
3297 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3298 atomic_inc(&hardware_enable_failed);
3299 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu);
3303 static int kvm_starting_cpu(unsigned int cpu)
3305 raw_spin_lock(&kvm_count_lock);
3306 if (kvm_usage_count)
3307 hardware_enable_nolock(NULL);
3308 raw_spin_unlock(&kvm_count_lock);
3312 static void hardware_disable_nolock(void *junk)
3314 int cpu = raw_smp_processor_id();
3316 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
3318 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3319 kvm_arch_hardware_disable();
3322 static int kvm_dying_cpu(unsigned int cpu)
3324 raw_spin_lock(&kvm_count_lock);
3325 if (kvm_usage_count)
3326 hardware_disable_nolock(NULL);
3327 raw_spin_unlock(&kvm_count_lock);
3331 static void hardware_disable_all_nolock(void)
3333 BUG_ON(!kvm_usage_count);
3336 if (!kvm_usage_count)
3337 on_each_cpu(hardware_disable_nolock, NULL, 1);
3340 static void hardware_disable_all(void)
3342 raw_spin_lock(&kvm_count_lock);
3343 hardware_disable_all_nolock();
3344 raw_spin_unlock(&kvm_count_lock);
3347 static int hardware_enable_all(void)
3351 raw_spin_lock(&kvm_count_lock);
3354 if (kvm_usage_count == 1) {
3355 atomic_set(&hardware_enable_failed, 0);
3356 on_each_cpu(hardware_enable_nolock, NULL, 1);
3358 if (atomic_read(&hardware_enable_failed)) {
3359 hardware_disable_all_nolock();
3364 raw_spin_unlock(&kvm_count_lock);
3369 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3373 * Some (well, at least mine) BIOSes hang on reboot if
3376 * And Intel TXT required VMX off for all cpu when system shutdown.
3378 pr_info("kvm: exiting hardware virtualization\n");
3379 kvm_rebooting = true;
3380 on_each_cpu(hardware_disable_nolock, NULL, 1);
3384 static struct notifier_block kvm_reboot_notifier = {
3385 .notifier_call = kvm_reboot,
3389 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3393 for (i = 0; i < bus->dev_count; i++) {
3394 struct kvm_io_device *pos = bus->range[i].dev;
3396 kvm_iodevice_destructor(pos);
3401 static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
3402 const struct kvm_io_range *r2)
3404 gpa_t addr1 = r1->addr;
3405 gpa_t addr2 = r2->addr;
3410 /* If r2->len == 0, match the exact address. If r2->len != 0,
3411 * accept any overlapping write. Any order is acceptable for
3412 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3413 * we process all of them.
3426 static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
3428 return kvm_io_bus_cmp(p1, p2);
3431 static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
3432 gpa_t addr, int len)
3434 struct kvm_io_range *range, key;
3437 key = (struct kvm_io_range) {
3442 range = bsearch(&key, bus->range, bus->dev_count,
3443 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
3447 off = range - bus->range;
3449 while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0)
3455 static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3456 struct kvm_io_range *range, const void *val)
3460 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3464 while (idx < bus->dev_count &&
3465 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3466 if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr,
3475 /* kvm_io_bus_write - called under kvm->slots_lock */
3476 int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3477 int len, const void *val)
3479 struct kvm_io_bus *bus;
3480 struct kvm_io_range range;
3483 range = (struct kvm_io_range) {
3488 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3491 r = __kvm_io_bus_write(vcpu, bus, &range, val);
3492 return r < 0 ? r : 0;
3495 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3496 int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
3497 gpa_t addr, int len, const void *val, long cookie)
3499 struct kvm_io_bus *bus;
3500 struct kvm_io_range range;
3502 range = (struct kvm_io_range) {
3507 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3511 /* First try the device referenced by cookie. */
3512 if ((cookie >= 0) && (cookie < bus->dev_count) &&
3513 (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
3514 if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len,
3519 * cookie contained garbage; fall back to search and return the
3520 * correct cookie value.
3522 return __kvm_io_bus_write(vcpu, bus, &range, val);
3525 static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3526 struct kvm_io_range *range, void *val)
3530 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3534 while (idx < bus->dev_count &&
3535 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3536 if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr,
3544 EXPORT_SYMBOL_GPL(kvm_io_bus_write);
3546 /* kvm_io_bus_read - called under kvm->slots_lock */
3547 int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3550 struct kvm_io_bus *bus;
3551 struct kvm_io_range range;
3554 range = (struct kvm_io_range) {
3559 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3562 r = __kvm_io_bus_read(vcpu, bus, &range, val);
3563 return r < 0 ? r : 0;
3567 /* Caller must hold slots_lock. */
3568 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
3569 int len, struct kvm_io_device *dev)
3572 struct kvm_io_bus *new_bus, *bus;
3573 struct kvm_io_range range;
3575 bus = kvm_get_bus(kvm, bus_idx);
3579 /* exclude ioeventfd which is limited by maximum fd */
3580 if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
3583 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) *
3584 sizeof(struct kvm_io_range)), GFP_KERNEL);
3588 range = (struct kvm_io_range) {
3594 for (i = 0; i < bus->dev_count; i++)
3595 if (kvm_io_bus_cmp(&bus->range[i], &range) > 0)
3598 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3599 new_bus->dev_count++;
3600 new_bus->range[i] = range;
3601 memcpy(new_bus->range + i + 1, bus->range + i,
3602 (bus->dev_count - i) * sizeof(struct kvm_io_range));
3603 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3604 synchronize_srcu_expedited(&kvm->srcu);
3610 /* Caller must hold slots_lock. */
3611 void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3612 struct kvm_io_device *dev)
3615 struct kvm_io_bus *new_bus, *bus;
3617 bus = kvm_get_bus(kvm, bus_idx);
3621 for (i = 0; i < bus->dev_count; i++)
3622 if (bus->range[i].dev == dev) {
3626 if (i == bus->dev_count)
3629 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) *
3630 sizeof(struct kvm_io_range)), GFP_KERNEL);
3632 pr_err("kvm: failed to shrink bus, removing it completely\n");
3636 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3637 new_bus->dev_count--;
3638 memcpy(new_bus->range + i, bus->range + i + 1,
3639 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
3642 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3643 synchronize_srcu_expedited(&kvm->srcu);
3648 struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3651 struct kvm_io_bus *bus;
3652 int dev_idx, srcu_idx;
3653 struct kvm_io_device *iodev = NULL;
3655 srcu_idx = srcu_read_lock(&kvm->srcu);
3657 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
3661 dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1);
3665 iodev = bus->range[dev_idx].dev;
3668 srcu_read_unlock(&kvm->srcu, srcu_idx);
3672 EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev);
3674 static int kvm_debugfs_open(struct inode *inode, struct file *file,
3675 int (*get)(void *, u64 *), int (*set)(void *, u64),
3678 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3681 /* The debugfs files are a reference to the kvm struct which
3682 * is still valid when kvm_destroy_vm is called.
3683 * To avoid the race between open and the removal of the debugfs
3684 * directory we test against the users count.
3686 if (!refcount_inc_not_zero(&stat_data->kvm->users_count))
3689 if (simple_attr_open(inode, file, get, set, fmt)) {
3690 kvm_put_kvm(stat_data->kvm);
3697 static int kvm_debugfs_release(struct inode *inode, struct file *file)
3699 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3702 simple_attr_release(inode, file);
3703 kvm_put_kvm(stat_data->kvm);
3708 static int vm_stat_get_per_vm(void *data, u64 *val)
3710 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3712 *val = *(ulong *)((void *)stat_data->kvm + stat_data->offset);
3717 static int vm_stat_clear_per_vm(void *data, u64 val)
3719 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3724 *(ulong *)((void *)stat_data->kvm + stat_data->offset) = 0;
3729 static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file)
3731 __simple_attr_check_format("%llu\n", 0ull);
3732 return kvm_debugfs_open(inode, file, vm_stat_get_per_vm,
3733 vm_stat_clear_per_vm, "%llu\n");
3736 static const struct file_operations vm_stat_get_per_vm_fops = {
3737 .owner = THIS_MODULE,
3738 .open = vm_stat_get_per_vm_open,
3739 .release = kvm_debugfs_release,
3740 .read = simple_attr_read,
3741 .write = simple_attr_write,
3742 .llseek = no_llseek,
3745 static int vcpu_stat_get_per_vm(void *data, u64 *val)
3748 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3749 struct kvm_vcpu *vcpu;
3753 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
3754 *val += *(u64 *)((void *)vcpu + stat_data->offset);
3759 static int vcpu_stat_clear_per_vm(void *data, u64 val)
3762 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3763 struct kvm_vcpu *vcpu;
3768 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
3769 *(u64 *)((void *)vcpu + stat_data->offset) = 0;
3774 static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file)
3776 __simple_attr_check_format("%llu\n", 0ull);
3777 return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm,
3778 vcpu_stat_clear_per_vm, "%llu\n");
3781 static const struct file_operations vcpu_stat_get_per_vm_fops = {
3782 .owner = THIS_MODULE,
3783 .open = vcpu_stat_get_per_vm_open,
3784 .release = kvm_debugfs_release,
3785 .read = simple_attr_read,
3786 .write = simple_attr_write,
3787 .llseek = no_llseek,
3790 static const struct file_operations *stat_fops_per_vm[] = {
3791 [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops,
3792 [KVM_STAT_VM] = &vm_stat_get_per_vm_fops,
3795 static int vm_stat_get(void *_offset, u64 *val)
3797 unsigned offset = (long)_offset;
3799 struct kvm_stat_data stat_tmp = {.offset = offset};
3803 spin_lock(&kvm_lock);
3804 list_for_each_entry(kvm, &vm_list, vm_list) {
3806 vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
3809 spin_unlock(&kvm_lock);
3813 static int vm_stat_clear(void *_offset, u64 val)
3815 unsigned offset = (long)_offset;
3817 struct kvm_stat_data stat_tmp = {.offset = offset};
3822 spin_lock(&kvm_lock);
3823 list_for_each_entry(kvm, &vm_list, vm_list) {
3825 vm_stat_clear_per_vm((void *)&stat_tmp, 0);
3827 spin_unlock(&kvm_lock);
3832 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n");
3834 static int vcpu_stat_get(void *_offset, u64 *val)
3836 unsigned offset = (long)_offset;
3838 struct kvm_stat_data stat_tmp = {.offset = offset};
3842 spin_lock(&kvm_lock);
3843 list_for_each_entry(kvm, &vm_list, vm_list) {
3845 vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
3848 spin_unlock(&kvm_lock);
3852 static int vcpu_stat_clear(void *_offset, u64 val)
3854 unsigned offset = (long)_offset;
3856 struct kvm_stat_data stat_tmp = {.offset = offset};
3861 spin_lock(&kvm_lock);
3862 list_for_each_entry(kvm, &vm_list, vm_list) {
3864 vcpu_stat_clear_per_vm((void *)&stat_tmp, 0);
3866 spin_unlock(&kvm_lock);
3871 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear,
3874 static const struct file_operations *stat_fops[] = {
3875 [KVM_STAT_VCPU] = &vcpu_stat_fops,
3876 [KVM_STAT_VM] = &vm_stat_fops,
3879 static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
3881 struct kobj_uevent_env *env;
3882 unsigned long long created, active;
3884 if (!kvm_dev.this_device || !kvm)
3887 spin_lock(&kvm_lock);
3888 if (type == KVM_EVENT_CREATE_VM) {
3889 kvm_createvm_count++;
3891 } else if (type == KVM_EVENT_DESTROY_VM) {
3894 created = kvm_createvm_count;
3895 active = kvm_active_vms;
3896 spin_unlock(&kvm_lock);
3898 env = kzalloc(sizeof(*env), GFP_KERNEL);
3902 add_uevent_var(env, "CREATED=%llu", created);
3903 add_uevent_var(env, "COUNT=%llu", active);
3905 if (type == KVM_EVENT_CREATE_VM) {
3906 add_uevent_var(env, "EVENT=create");
3907 kvm->userspace_pid = task_pid_nr(current);
3908 } else if (type == KVM_EVENT_DESTROY_VM) {
3909 add_uevent_var(env, "EVENT=destroy");
3911 add_uevent_var(env, "PID=%d", kvm->userspace_pid);
3913 if (kvm->debugfs_dentry) {
3914 char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL);
3917 tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX);
3919 add_uevent_var(env, "STATS_PATH=%s", tmp);
3923 /* no need for checks, since we are adding at most only 5 keys */
3924 env->envp[env->envp_idx++] = NULL;
3925 kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp);
3929 static void kvm_init_debug(void)
3931 struct kvm_stats_debugfs_item *p;
3933 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
3935 kvm_debugfs_num_entries = 0;
3936 for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) {
3937 debugfs_create_file(p->name, 0644, kvm_debugfs_dir,
3938 (void *)(long)p->offset,
3939 stat_fops[p->kind]);
3943 static int kvm_suspend(void)
3945 if (kvm_usage_count)
3946 hardware_disable_nolock(NULL);
3950 static void kvm_resume(void)
3952 if (kvm_usage_count) {
3953 WARN_ON(raw_spin_is_locked(&kvm_count_lock));
3954 hardware_enable_nolock(NULL);
3958 static struct syscore_ops kvm_syscore_ops = {
3959 .suspend = kvm_suspend,
3960 .resume = kvm_resume,
3964 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3966 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3969 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3971 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3973 if (vcpu->preempted)
3974 vcpu->preempted = false;
3976 kvm_arch_sched_in(vcpu, cpu);
3978 kvm_arch_vcpu_load(vcpu, cpu);
3981 static void kvm_sched_out(struct preempt_notifier *pn,
3982 struct task_struct *next)
3984 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3986 if (current->state == TASK_RUNNING)
3987 vcpu->preempted = true;
3988 kvm_arch_vcpu_put(vcpu);
3991 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
3992 struct module *module)
3997 r = kvm_arch_init(opaque);
4002 * kvm_arch_init makes sure there's at most one caller
4003 * for architectures that support multiple implementations,
4004 * like intel and amd on x86.
4005 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
4006 * conflicts in case kvm is already setup for another implementation.
4008 r = kvm_irqfd_init();
4012 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
4017 r = kvm_arch_hardware_setup();
4021 for_each_online_cpu(cpu) {
4022 smp_call_function_single(cpu,
4023 kvm_arch_check_processor_compat,
4029 r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting",
4030 kvm_starting_cpu, kvm_dying_cpu);
4033 register_reboot_notifier(&kvm_reboot_notifier);
4035 /* A kmem cache lets us meet the alignment requirements of fx_save. */
4037 vcpu_align = __alignof__(struct kvm_vcpu);
4039 kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align,
4041 offsetof(struct kvm_vcpu, arch),
4042 sizeof_field(struct kvm_vcpu, arch),
4044 if (!kvm_vcpu_cache) {
4049 r = kvm_async_pf_init();
4053 kvm_chardev_ops.owner = module;
4054 kvm_vm_fops.owner = module;
4055 kvm_vcpu_fops.owner = module;
4057 r = misc_register(&kvm_dev);
4059 pr_err("kvm: misc device register failed\n");
4063 register_syscore_ops(&kvm_syscore_ops);
4065 kvm_preempt_ops.sched_in = kvm_sched_in;
4066 kvm_preempt_ops.sched_out = kvm_sched_out;
4070 r = kvm_vfio_ops_init();
4076 kvm_async_pf_deinit();
4078 kmem_cache_destroy(kvm_vcpu_cache);
4080 unregister_reboot_notifier(&kvm_reboot_notifier);
4081 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
4084 kvm_arch_hardware_unsetup();
4086 free_cpumask_var(cpus_hardware_enabled);
4094 EXPORT_SYMBOL_GPL(kvm_init);
4098 debugfs_remove_recursive(kvm_debugfs_dir);
4099 misc_deregister(&kvm_dev);
4100 kmem_cache_destroy(kvm_vcpu_cache);
4101 kvm_async_pf_deinit();
4102 unregister_syscore_ops(&kvm_syscore_ops);
4103 unregister_reboot_notifier(&kvm_reboot_notifier);
4104 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
4105 on_each_cpu(hardware_disable_nolock, NULL, 1);
4106 kvm_arch_hardware_unsetup();
4109 free_cpumask_var(cpus_hardware_enabled);
4110 kvm_vfio_ops_exit();
4112 EXPORT_SYMBOL_GPL(kvm_exit);