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,
120 static int hardware_enable_all(void);
121 static void hardware_disable_all(void);
123 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
125 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn);
127 __visible bool kvm_rebooting;
128 EXPORT_SYMBOL_GPL(kvm_rebooting);
130 static bool largepages_enabled = true;
132 #define KVM_EVENT_CREATE_VM 0
133 #define KVM_EVENT_DESTROY_VM 1
134 static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm);
135 static unsigned long long kvm_createvm_count;
136 static unsigned long long kvm_active_vms;
138 __weak void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
139 unsigned long start, unsigned long end)
143 bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
146 return PageReserved(pfn_to_page(pfn));
152 * Switches to specified vcpu, until a matching vcpu_put()
154 void vcpu_load(struct kvm_vcpu *vcpu)
157 preempt_notifier_register(&vcpu->preempt_notifier);
158 kvm_arch_vcpu_load(vcpu, cpu);
161 EXPORT_SYMBOL_GPL(vcpu_load);
163 void vcpu_put(struct kvm_vcpu *vcpu)
166 kvm_arch_vcpu_put(vcpu);
167 preempt_notifier_unregister(&vcpu->preempt_notifier);
170 EXPORT_SYMBOL_GPL(vcpu_put);
172 /* TODO: merge with kvm_arch_vcpu_should_kick */
173 static bool kvm_request_needs_ipi(struct kvm_vcpu *vcpu, unsigned req)
175 int mode = kvm_vcpu_exiting_guest_mode(vcpu);
178 * We need to wait for the VCPU to reenable interrupts and get out of
179 * READING_SHADOW_PAGE_TABLES mode.
181 if (req & KVM_REQUEST_WAIT)
182 return mode != OUTSIDE_GUEST_MODE;
185 * Need to kick a running VCPU, but otherwise there is nothing to do.
187 return mode == IN_GUEST_MODE;
190 static void ack_flush(void *_completed)
194 static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait)
197 cpus = cpu_online_mask;
199 if (cpumask_empty(cpus))
202 smp_call_function_many(cpus, ack_flush, NULL, wait);
206 bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
211 struct kvm_vcpu *vcpu;
213 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
216 kvm_for_each_vcpu(i, vcpu, kvm) {
217 kvm_make_request(req, vcpu);
220 if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu))
223 if (cpus != NULL && cpu != -1 && cpu != me &&
224 kvm_request_needs_ipi(vcpu, req))
225 __cpumask_set_cpu(cpu, cpus);
227 called = kvm_kick_many_cpus(cpus, !!(req & KVM_REQUEST_WAIT));
229 free_cpumask_var(cpus);
233 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
234 void kvm_flush_remote_tlbs(struct kvm *kvm)
237 * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
238 * kvm_make_all_cpus_request.
240 long dirty_count = smp_load_acquire(&kvm->tlbs_dirty);
243 * We want to publish modifications to the page tables before reading
244 * mode. Pairs with a memory barrier in arch-specific code.
245 * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest
246 * and smp_mb in walk_shadow_page_lockless_begin/end.
247 * - powerpc: smp_mb in kvmppc_prepare_to_enter.
249 * There is already an smp_mb__after_atomic() before
250 * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
253 if (kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
254 ++kvm->stat.remote_tlb_flush;
255 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
257 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
260 void kvm_reload_remote_mmus(struct kvm *kvm)
262 kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
265 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
270 mutex_init(&vcpu->mutex);
275 init_swait_queue_head(&vcpu->wq);
276 kvm_async_pf_vcpu_init(vcpu);
279 INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
281 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
286 vcpu->run = page_address(page);
288 kvm_vcpu_set_in_spin_loop(vcpu, false);
289 kvm_vcpu_set_dy_eligible(vcpu, false);
290 vcpu->preempted = false;
292 r = kvm_arch_vcpu_init(vcpu);
298 free_page((unsigned long)vcpu->run);
302 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
304 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
307 * no need for rcu_read_lock as VCPU_RUN is the only place that
308 * will change the vcpu->pid pointer and on uninit all file
309 * descriptors are already gone.
311 put_pid(rcu_dereference_protected(vcpu->pid, 1));
312 kvm_arch_vcpu_uninit(vcpu);
313 free_page((unsigned long)vcpu->run);
315 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
317 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
318 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
320 return container_of(mn, struct kvm, mmu_notifier);
323 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
324 struct mm_struct *mm,
325 unsigned long address,
328 struct kvm *kvm = mmu_notifier_to_kvm(mn);
331 idx = srcu_read_lock(&kvm->srcu);
332 spin_lock(&kvm->mmu_lock);
333 kvm->mmu_notifier_seq++;
334 kvm_set_spte_hva(kvm, address, pte);
335 spin_unlock(&kvm->mmu_lock);
336 srcu_read_unlock(&kvm->srcu, idx);
339 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
340 struct mm_struct *mm,
344 struct kvm *kvm = mmu_notifier_to_kvm(mn);
345 int need_tlb_flush = 0, idx;
347 idx = srcu_read_lock(&kvm->srcu);
348 spin_lock(&kvm->mmu_lock);
350 * The count increase must become visible at unlock time as no
351 * spte can be established without taking the mmu_lock and
352 * count is also read inside the mmu_lock critical section.
354 kvm->mmu_notifier_count++;
355 need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
356 need_tlb_flush |= kvm->tlbs_dirty;
357 /* we've to flush the tlb before the pages can be freed */
359 kvm_flush_remote_tlbs(kvm);
361 spin_unlock(&kvm->mmu_lock);
363 kvm_arch_mmu_notifier_invalidate_range(kvm, start, end);
365 srcu_read_unlock(&kvm->srcu, idx);
368 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
369 struct mm_struct *mm,
373 struct kvm *kvm = mmu_notifier_to_kvm(mn);
375 spin_lock(&kvm->mmu_lock);
377 * This sequence increase will notify the kvm page fault that
378 * the page that is going to be mapped in the spte could have
381 kvm->mmu_notifier_seq++;
384 * The above sequence increase must be visible before the
385 * below count decrease, which is ensured by the smp_wmb above
386 * in conjunction with the smp_rmb in mmu_notifier_retry().
388 kvm->mmu_notifier_count--;
389 spin_unlock(&kvm->mmu_lock);
391 BUG_ON(kvm->mmu_notifier_count < 0);
394 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
395 struct mm_struct *mm,
399 struct kvm *kvm = mmu_notifier_to_kvm(mn);
402 idx = srcu_read_lock(&kvm->srcu);
403 spin_lock(&kvm->mmu_lock);
405 young = kvm_age_hva(kvm, start, end);
407 kvm_flush_remote_tlbs(kvm);
409 spin_unlock(&kvm->mmu_lock);
410 srcu_read_unlock(&kvm->srcu, idx);
415 static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
416 struct mm_struct *mm,
420 struct kvm *kvm = mmu_notifier_to_kvm(mn);
423 idx = srcu_read_lock(&kvm->srcu);
424 spin_lock(&kvm->mmu_lock);
426 * Even though we do not flush TLB, this will still adversely
427 * affect performance on pre-Haswell Intel EPT, where there is
428 * no EPT Access Bit to clear so that we have to tear down EPT
429 * tables instead. If we find this unacceptable, we can always
430 * add a parameter to kvm_age_hva so that it effectively doesn't
431 * do anything on clear_young.
433 * Also note that currently we never issue secondary TLB flushes
434 * from clear_young, leaving this job up to the regular system
435 * cadence. If we find this inaccurate, we might come up with a
436 * more sophisticated heuristic later.
438 young = kvm_age_hva(kvm, start, end);
439 spin_unlock(&kvm->mmu_lock);
440 srcu_read_unlock(&kvm->srcu, idx);
445 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
446 struct mm_struct *mm,
447 unsigned long address)
449 struct kvm *kvm = mmu_notifier_to_kvm(mn);
452 idx = srcu_read_lock(&kvm->srcu);
453 spin_lock(&kvm->mmu_lock);
454 young = kvm_test_age_hva(kvm, address);
455 spin_unlock(&kvm->mmu_lock);
456 srcu_read_unlock(&kvm->srcu, idx);
461 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
462 struct mm_struct *mm)
464 struct kvm *kvm = mmu_notifier_to_kvm(mn);
467 idx = srcu_read_lock(&kvm->srcu);
468 kvm_arch_flush_shadow_all(kvm);
469 srcu_read_unlock(&kvm->srcu, idx);
472 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
473 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
474 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
475 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
476 .clear_young = kvm_mmu_notifier_clear_young,
477 .test_young = kvm_mmu_notifier_test_young,
478 .change_pte = kvm_mmu_notifier_change_pte,
479 .release = kvm_mmu_notifier_release,
482 static int kvm_init_mmu_notifier(struct kvm *kvm)
484 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
485 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
488 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
490 static int kvm_init_mmu_notifier(struct kvm *kvm)
495 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
497 static struct kvm_memslots *kvm_alloc_memslots(void)
500 struct kvm_memslots *slots;
502 slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
506 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
507 slots->id_to_index[i] = slots->memslots[i].id = i;
512 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
514 if (!memslot->dirty_bitmap)
517 kvfree(memslot->dirty_bitmap);
518 memslot->dirty_bitmap = NULL;
522 * Free any memory in @free but not in @dont.
524 static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
525 struct kvm_memory_slot *dont)
527 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
528 kvm_destroy_dirty_bitmap(free);
530 kvm_arch_free_memslot(kvm, free, dont);
535 static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
537 struct kvm_memory_slot *memslot;
542 kvm_for_each_memslot(memslot, slots)
543 kvm_free_memslot(kvm, memslot, NULL);
548 static void kvm_destroy_vm_debugfs(struct kvm *kvm)
552 if (!kvm->debugfs_dentry)
555 debugfs_remove_recursive(kvm->debugfs_dentry);
557 if (kvm->debugfs_stat_data) {
558 for (i = 0; i < kvm_debugfs_num_entries; i++)
559 kfree(kvm->debugfs_stat_data[i]);
560 kfree(kvm->debugfs_stat_data);
564 static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
566 char dir_name[ITOA_MAX_LEN * 2];
567 struct kvm_stat_data *stat_data;
568 struct kvm_stats_debugfs_item *p;
570 if (!debugfs_initialized())
573 snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd);
574 kvm->debugfs_dentry = debugfs_create_dir(dir_name,
576 if (!kvm->debugfs_dentry)
579 kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries,
580 sizeof(*kvm->debugfs_stat_data),
582 if (!kvm->debugfs_stat_data)
585 for (p = debugfs_entries; p->name; p++) {
586 stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL);
590 stat_data->kvm = kvm;
591 stat_data->offset = p->offset;
592 kvm->debugfs_stat_data[p - debugfs_entries] = stat_data;
593 if (!debugfs_create_file(p->name, 0644,
596 stat_fops_per_vm[p->kind]))
602 static struct kvm *kvm_create_vm(unsigned long type)
605 struct kvm *kvm = kvm_arch_alloc_vm();
608 return ERR_PTR(-ENOMEM);
610 spin_lock_init(&kvm->mmu_lock);
612 kvm->mm = current->mm;
613 kvm_eventfd_init(kvm);
614 mutex_init(&kvm->lock);
615 mutex_init(&kvm->irq_lock);
616 mutex_init(&kvm->slots_lock);
617 refcount_set(&kvm->users_count, 1);
618 INIT_LIST_HEAD(&kvm->devices);
620 r = kvm_arch_init_vm(kvm, type);
622 goto out_err_no_disable;
624 r = hardware_enable_all();
626 goto out_err_no_disable;
628 #ifdef CONFIG_HAVE_KVM_IRQFD
629 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
632 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
635 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
636 struct kvm_memslots *slots = kvm_alloc_memslots();
638 goto out_err_no_srcu;
640 * Generations must be different for each address space.
641 * Init kvm generation close to the maximum to easily test the
642 * code of handling generation number wrap-around.
644 slots->generation = i * 2 - 150;
645 rcu_assign_pointer(kvm->memslots[i], slots);
648 if (init_srcu_struct(&kvm->srcu))
649 goto out_err_no_srcu;
650 if (init_srcu_struct(&kvm->irq_srcu))
651 goto out_err_no_irq_srcu;
652 for (i = 0; i < KVM_NR_BUSES; i++) {
653 rcu_assign_pointer(kvm->buses[i],
654 kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL));
659 r = kvm_init_mmu_notifier(kvm);
663 spin_lock(&kvm_lock);
664 list_add(&kvm->vm_list, &vm_list);
665 spin_unlock(&kvm_lock);
667 preempt_notifier_inc();
672 cleanup_srcu_struct(&kvm->irq_srcu);
674 cleanup_srcu_struct(&kvm->srcu);
676 hardware_disable_all();
678 refcount_set(&kvm->users_count, 0);
679 for (i = 0; i < KVM_NR_BUSES; i++)
680 kfree(kvm_get_bus(kvm, i));
681 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
682 kvm_free_memslots(kvm, __kvm_memslots(kvm, i));
683 kvm_arch_free_vm(kvm);
688 static void kvm_destroy_devices(struct kvm *kvm)
690 struct kvm_device *dev, *tmp;
693 * We do not need to take the kvm->lock here, because nobody else
694 * has a reference to the struct kvm at this point and therefore
695 * cannot access the devices list anyhow.
697 list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) {
698 list_del(&dev->vm_node);
699 dev->ops->destroy(dev);
703 static void kvm_destroy_vm(struct kvm *kvm)
706 struct mm_struct *mm = kvm->mm;
708 kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm);
709 kvm_destroy_vm_debugfs(kvm);
710 kvm_arch_sync_events(kvm);
711 spin_lock(&kvm_lock);
712 list_del(&kvm->vm_list);
713 spin_unlock(&kvm_lock);
714 kvm_free_irq_routing(kvm);
715 for (i = 0; i < KVM_NR_BUSES; i++) {
716 struct kvm_io_bus *bus = kvm_get_bus(kvm, i);
719 kvm_io_bus_destroy(bus);
720 kvm->buses[i] = NULL;
722 kvm_coalesced_mmio_free(kvm);
723 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
724 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
726 kvm_arch_flush_shadow_all(kvm);
728 kvm_arch_destroy_vm(kvm);
729 kvm_destroy_devices(kvm);
730 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
731 kvm_free_memslots(kvm, __kvm_memslots(kvm, i));
732 cleanup_srcu_struct(&kvm->irq_srcu);
733 cleanup_srcu_struct(&kvm->srcu);
734 kvm_arch_free_vm(kvm);
735 preempt_notifier_dec();
736 hardware_disable_all();
740 void kvm_get_kvm(struct kvm *kvm)
742 refcount_inc(&kvm->users_count);
744 EXPORT_SYMBOL_GPL(kvm_get_kvm);
746 void kvm_put_kvm(struct kvm *kvm)
748 if (refcount_dec_and_test(&kvm->users_count))
751 EXPORT_SYMBOL_GPL(kvm_put_kvm);
754 static int kvm_vm_release(struct inode *inode, struct file *filp)
756 struct kvm *kvm = filp->private_data;
758 kvm_irqfd_release(kvm);
765 * Allocation size is twice as large as the actual dirty bitmap size.
766 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
768 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
770 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
772 memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL);
773 if (!memslot->dirty_bitmap)
780 * Insert memslot and re-sort memslots based on their GFN,
781 * so binary search could be used to lookup GFN.
782 * Sorting algorithm takes advantage of having initially
783 * sorted array and known changed memslot position.
785 static void update_memslots(struct kvm_memslots *slots,
786 struct kvm_memory_slot *new)
789 int i = slots->id_to_index[id];
790 struct kvm_memory_slot *mslots = slots->memslots;
792 WARN_ON(mslots[i].id != id);
794 WARN_ON(!mslots[i].npages);
795 if (mslots[i].npages)
798 if (!mslots[i].npages)
802 while (i < KVM_MEM_SLOTS_NUM - 1 &&
803 new->base_gfn <= mslots[i + 1].base_gfn) {
804 if (!mslots[i + 1].npages)
806 mslots[i] = mslots[i + 1];
807 slots->id_to_index[mslots[i].id] = i;
812 * The ">=" is needed when creating a slot with base_gfn == 0,
813 * so that it moves before all those with base_gfn == npages == 0.
815 * On the other hand, if new->npages is zero, the above loop has
816 * already left i pointing to the beginning of the empty part of
817 * mslots, and the ">=" would move the hole backwards in this
818 * case---which is wrong. So skip the loop when deleting a slot.
822 new->base_gfn >= mslots[i - 1].base_gfn) {
823 mslots[i] = mslots[i - 1];
824 slots->id_to_index[mslots[i].id] = i;
828 WARN_ON_ONCE(i != slots->used_slots);
831 slots->id_to_index[mslots[i].id] = i;
834 static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem)
836 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
838 #ifdef __KVM_HAVE_READONLY_MEM
839 valid_flags |= KVM_MEM_READONLY;
842 if (mem->flags & ~valid_flags)
848 static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
849 int as_id, struct kvm_memslots *slots)
851 struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id);
854 * Set the low bit in the generation, which disables SPTE caching
855 * until the end of synchronize_srcu_expedited.
857 WARN_ON(old_memslots->generation & 1);
858 slots->generation = old_memslots->generation + 1;
860 rcu_assign_pointer(kvm->memslots[as_id], slots);
861 synchronize_srcu_expedited(&kvm->srcu);
864 * Increment the new memslot generation a second time. This prevents
865 * vm exits that race with memslot updates from caching a memslot
866 * generation that will (potentially) be valid forever.
868 * Generations must be unique even across address spaces. We do not need
869 * a global counter for that, instead the generation space is evenly split
870 * across address spaces. For example, with two address spaces, address
871 * space 0 will use generations 0, 4, 8, ... while * address space 1 will
872 * use generations 2, 6, 10, 14, ...
874 slots->generation += KVM_ADDRESS_SPACE_NUM * 2 - 1;
876 kvm_arch_memslots_updated(kvm, slots);
882 * Allocate some memory and give it an address in the guest physical address
885 * Discontiguous memory is allowed, mostly for framebuffers.
887 * Must be called holding kvm->slots_lock for write.
889 int __kvm_set_memory_region(struct kvm *kvm,
890 const struct kvm_userspace_memory_region *mem)
894 unsigned long npages;
895 struct kvm_memory_slot *slot;
896 struct kvm_memory_slot old, new;
897 struct kvm_memslots *slots = NULL, *old_memslots;
899 enum kvm_mr_change change;
901 r = check_memory_region_flags(mem);
906 as_id = mem->slot >> 16;
909 /* General sanity checks */
910 if (mem->memory_size & (PAGE_SIZE - 1))
912 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
914 /* We can read the guest memory with __xxx_user() later on. */
915 if ((id < KVM_USER_MEM_SLOTS) &&
916 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
917 !access_ok(VERIFY_WRITE,
918 (void __user *)(unsigned long)mem->userspace_addr,
921 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM)
923 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
926 slot = id_to_memslot(__kvm_memslots(kvm, as_id), id);
927 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
928 npages = mem->memory_size >> PAGE_SHIFT;
930 if (npages > KVM_MEM_MAX_NR_PAGES)
936 new.base_gfn = base_gfn;
938 new.flags = mem->flags;
942 change = KVM_MR_CREATE;
943 else { /* Modify an existing slot. */
944 if ((mem->userspace_addr != old.userspace_addr) ||
945 (npages != old.npages) ||
946 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
949 if (base_gfn != old.base_gfn)
950 change = KVM_MR_MOVE;
951 else if (new.flags != old.flags)
952 change = KVM_MR_FLAGS_ONLY;
953 else { /* Nothing to change. */
962 change = KVM_MR_DELETE;
967 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
968 /* Check for overlaps */
970 kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) {
971 if ((slot->id >= KVM_USER_MEM_SLOTS) ||
974 if (!((base_gfn + npages <= slot->base_gfn) ||
975 (base_gfn >= slot->base_gfn + slot->npages)))
980 /* Free page dirty bitmap if unneeded */
981 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
982 new.dirty_bitmap = NULL;
985 if (change == KVM_MR_CREATE) {
986 new.userspace_addr = mem->userspace_addr;
988 if (kvm_arch_create_memslot(kvm, &new, npages))
992 /* Allocate page dirty bitmap if needed */
993 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
994 if (kvm_create_dirty_bitmap(&new) < 0)
998 slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
1001 memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots));
1003 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
1004 slot = id_to_memslot(slots, id);
1005 slot->flags |= KVM_MEMSLOT_INVALID;
1007 old_memslots = install_new_memslots(kvm, as_id, slots);
1009 /* From this point no new shadow pages pointing to a deleted,
1010 * or moved, memslot will be created.
1012 * validation of sp->gfn happens in:
1013 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
1014 * - kvm_is_visible_gfn (mmu_check_roots)
1016 kvm_arch_flush_shadow_memslot(kvm, slot);
1019 * We can re-use the old_memslots from above, the only difference
1020 * from the currently installed memslots is the invalid flag. This
1021 * will get overwritten by update_memslots anyway.
1023 slots = old_memslots;
1026 r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
1030 /* actual memory is freed via old in kvm_free_memslot below */
1031 if (change == KVM_MR_DELETE) {
1032 new.dirty_bitmap = NULL;
1033 memset(&new.arch, 0, sizeof(new.arch));
1036 update_memslots(slots, &new);
1037 old_memslots = install_new_memslots(kvm, as_id, slots);
1039 kvm_arch_commit_memory_region(kvm, mem, &old, &new, change);
1041 kvm_free_memslot(kvm, &old, &new);
1042 kvfree(old_memslots);
1048 kvm_free_memslot(kvm, &new, &old);
1052 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
1054 int kvm_set_memory_region(struct kvm *kvm,
1055 const struct kvm_userspace_memory_region *mem)
1059 mutex_lock(&kvm->slots_lock);
1060 r = __kvm_set_memory_region(kvm, mem);
1061 mutex_unlock(&kvm->slots_lock);
1064 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1066 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1067 struct kvm_userspace_memory_region *mem)
1069 if ((u16)mem->slot >= KVM_USER_MEM_SLOTS)
1072 return kvm_set_memory_region(kvm, mem);
1075 int kvm_get_dirty_log(struct kvm *kvm,
1076 struct kvm_dirty_log *log, int *is_dirty)
1078 struct kvm_memslots *slots;
1079 struct kvm_memory_slot *memslot;
1082 unsigned long any = 0;
1084 as_id = log->slot >> 16;
1085 id = (u16)log->slot;
1086 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1089 slots = __kvm_memslots(kvm, as_id);
1090 memslot = id_to_memslot(slots, id);
1091 if (!memslot->dirty_bitmap)
1094 n = kvm_dirty_bitmap_bytes(memslot);
1096 for (i = 0; !any && i < n/sizeof(long); ++i)
1097 any = memslot->dirty_bitmap[i];
1099 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1106 EXPORT_SYMBOL_GPL(kvm_get_dirty_log);
1108 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1110 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1111 * are dirty write protect them for next write.
1112 * @kvm: pointer to kvm instance
1113 * @log: slot id and address to which we copy the log
1114 * @is_dirty: flag set if any page is dirty
1116 * We need to keep it in mind that VCPU threads can write to the bitmap
1117 * concurrently. So, to avoid losing track of dirty pages we keep the
1120 * 1. Take a snapshot of the bit and clear it if needed.
1121 * 2. Write protect the corresponding page.
1122 * 3. Copy the snapshot to the userspace.
1123 * 4. Upon return caller flushes TLB's if needed.
1125 * Between 2 and 4, the guest may write to the page using the remaining TLB
1126 * entry. This is not a problem because the page is reported dirty using
1127 * the snapshot taken before and step 4 ensures that writes done after
1128 * exiting to userspace will be logged for the next call.
1131 int kvm_get_dirty_log_protect(struct kvm *kvm,
1132 struct kvm_dirty_log *log, bool *is_dirty)
1134 struct kvm_memslots *slots;
1135 struct kvm_memory_slot *memslot;
1138 unsigned long *dirty_bitmap;
1139 unsigned long *dirty_bitmap_buffer;
1141 as_id = log->slot >> 16;
1142 id = (u16)log->slot;
1143 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1146 slots = __kvm_memslots(kvm, as_id);
1147 memslot = id_to_memslot(slots, id);
1149 dirty_bitmap = memslot->dirty_bitmap;
1153 n = kvm_dirty_bitmap_bytes(memslot);
1155 dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long);
1156 memset(dirty_bitmap_buffer, 0, n);
1158 spin_lock(&kvm->mmu_lock);
1160 for (i = 0; i < n / sizeof(long); i++) {
1164 if (!dirty_bitmap[i])
1169 mask = xchg(&dirty_bitmap[i], 0);
1170 dirty_bitmap_buffer[i] = mask;
1173 offset = i * BITS_PER_LONG;
1174 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
1179 spin_unlock(&kvm->mmu_lock);
1180 if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
1184 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect);
1187 bool kvm_largepages_enabled(void)
1189 return largepages_enabled;
1192 void kvm_disable_largepages(void)
1194 largepages_enabled = false;
1196 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
1198 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1200 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1202 EXPORT_SYMBOL_GPL(gfn_to_memslot);
1204 struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn)
1206 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn);
1209 bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1211 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1213 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
1214 memslot->flags & KVM_MEMSLOT_INVALID)
1219 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1221 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1223 struct vm_area_struct *vma;
1224 unsigned long addr, size;
1228 addr = gfn_to_hva(kvm, gfn);
1229 if (kvm_is_error_hva(addr))
1232 down_read(¤t->mm->mmap_sem);
1233 vma = find_vma(current->mm, addr);
1237 size = vma_kernel_pagesize(vma);
1240 up_read(¤t->mm->mmap_sem);
1245 static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1247 return slot->flags & KVM_MEM_READONLY;
1250 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1251 gfn_t *nr_pages, bool write)
1253 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1254 return KVM_HVA_ERR_BAD;
1256 if (memslot_is_readonly(slot) && write)
1257 return KVM_HVA_ERR_RO_BAD;
1260 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1262 return __gfn_to_hva_memslot(slot, gfn);
1265 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1268 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1271 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1274 return gfn_to_hva_many(slot, gfn, NULL);
1276 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1278 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1280 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1282 EXPORT_SYMBOL_GPL(gfn_to_hva);
1284 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn)
1286 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL);
1288 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva);
1291 * If writable is set to false, the hva returned by this function is only
1292 * allowed to be read.
1294 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot,
1295 gfn_t gfn, bool *writable)
1297 unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false);
1299 if (!kvm_is_error_hva(hva) && writable)
1300 *writable = !memslot_is_readonly(slot);
1305 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
1307 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1309 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1312 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable)
1314 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1316 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1319 static int get_user_page_nowait(unsigned long start, int write,
1322 int flags = FOLL_NOWAIT | FOLL_HWPOISON;
1325 flags |= FOLL_WRITE;
1327 return get_user_pages(start, 1, flags, page, NULL);
1330 static inline int check_user_page_hwpoison(unsigned long addr)
1332 int rc, flags = FOLL_HWPOISON | FOLL_WRITE;
1334 rc = get_user_pages(addr, 1, flags, NULL, NULL);
1335 return rc == -EHWPOISON;
1339 * The atomic path to get the writable pfn which will be stored in @pfn,
1340 * true indicates success, otherwise false is returned.
1342 static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async,
1343 bool write_fault, bool *writable, kvm_pfn_t *pfn)
1345 struct page *page[1];
1348 if (!(async || atomic))
1352 * Fast pin a writable pfn only if it is a write fault request
1353 * or the caller allows to map a writable pfn for a read fault
1356 if (!(write_fault || writable))
1359 npages = __get_user_pages_fast(addr, 1, 1, page);
1361 *pfn = page_to_pfn(page[0]);
1372 * The slow path to get the pfn of the specified host virtual address,
1373 * 1 indicates success, -errno is returned if error is detected.
1375 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1376 bool *writable, kvm_pfn_t *pfn)
1378 struct page *page[1];
1384 *writable = write_fault;
1387 down_read(¤t->mm->mmap_sem);
1388 npages = get_user_page_nowait(addr, write_fault, page);
1389 up_read(¤t->mm->mmap_sem);
1391 unsigned int flags = FOLL_HWPOISON;
1394 flags |= FOLL_WRITE;
1396 npages = get_user_pages_unlocked(addr, 1, page, flags);
1401 /* map read fault as writable if possible */
1402 if (unlikely(!write_fault) && writable) {
1403 struct page *wpage[1];
1405 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1414 *pfn = page_to_pfn(page[0]);
1418 static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1420 if (unlikely(!(vma->vm_flags & VM_READ)))
1423 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1429 static int hva_to_pfn_remapped(struct vm_area_struct *vma,
1430 unsigned long addr, bool *async,
1431 bool write_fault, kvm_pfn_t *p_pfn)
1436 r = follow_pfn(vma, addr, &pfn);
1439 * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
1440 * not call the fault handler, so do it here.
1442 bool unlocked = false;
1443 r = fixup_user_fault(current, current->mm, addr,
1444 (write_fault ? FAULT_FLAG_WRITE : 0),
1451 r = follow_pfn(vma, addr, &pfn);
1459 * Get a reference here because callers of *hva_to_pfn* and
1460 * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the
1461 * returned pfn. This is only needed if the VMA has VM_MIXEDMAP
1462 * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will
1463 * simply do nothing for reserved pfns.
1465 * Whoever called remap_pfn_range is also going to call e.g.
1466 * unmap_mapping_range before the underlying pages are freed,
1467 * causing a call to our MMU notifier.
1476 * Pin guest page in memory and return its pfn.
1477 * @addr: host virtual address which maps memory to the guest
1478 * @atomic: whether this function can sleep
1479 * @async: whether this function need to wait IO complete if the
1480 * host page is not in the memory
1481 * @write_fault: whether we should get a writable host page
1482 * @writable: whether it allows to map a writable host page for !@write_fault
1484 * The function will map a writable host page for these two cases:
1485 * 1): @write_fault = true
1486 * 2): @write_fault = false && @writable, @writable will tell the caller
1487 * whether the mapping is writable.
1489 static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1490 bool write_fault, bool *writable)
1492 struct vm_area_struct *vma;
1496 /* we can do it either atomically or asynchronously, not both */
1497 BUG_ON(atomic && async);
1499 if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn))
1503 return KVM_PFN_ERR_FAULT;
1505 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1509 down_read(¤t->mm->mmap_sem);
1510 if (npages == -EHWPOISON ||
1511 (!async && check_user_page_hwpoison(addr))) {
1512 pfn = KVM_PFN_ERR_HWPOISON;
1517 vma = find_vma_intersection(current->mm, addr, addr + 1);
1520 pfn = KVM_PFN_ERR_FAULT;
1521 else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) {
1522 r = hva_to_pfn_remapped(vma, addr, async, write_fault, &pfn);
1526 pfn = KVM_PFN_ERR_FAULT;
1528 if (async && vma_is_valid(vma, write_fault))
1530 pfn = KVM_PFN_ERR_FAULT;
1533 up_read(¤t->mm->mmap_sem);
1537 kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
1538 bool atomic, bool *async, bool write_fault,
1541 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1543 if (addr == KVM_HVA_ERR_RO_BAD) {
1546 return KVM_PFN_ERR_RO_FAULT;
1549 if (kvm_is_error_hva(addr)) {
1552 return KVM_PFN_NOSLOT;
1555 /* Do not map writable pfn in the readonly memslot. */
1556 if (writable && memslot_is_readonly(slot)) {
1561 return hva_to_pfn(addr, atomic, async, write_fault,
1564 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot);
1566 kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1569 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL,
1570 write_fault, writable);
1572 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1574 kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1576 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1578 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot);
1580 kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1582 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1584 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1586 kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1588 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn);
1590 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1592 kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn)
1594 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1596 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic);
1598 kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1600 return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn);
1602 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1604 kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
1606 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1608 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn);
1610 int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1611 struct page **pages, int nr_pages)
1616 addr = gfn_to_hva_many(slot, gfn, &entry);
1617 if (kvm_is_error_hva(addr))
1620 if (entry < nr_pages)
1623 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1625 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1627 static struct page *kvm_pfn_to_page(kvm_pfn_t pfn)
1629 if (is_error_noslot_pfn(pfn))
1630 return KVM_ERR_PTR_BAD_PAGE;
1632 if (kvm_is_reserved_pfn(pfn)) {
1634 return KVM_ERR_PTR_BAD_PAGE;
1637 return pfn_to_page(pfn);
1640 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1644 pfn = gfn_to_pfn(kvm, gfn);
1646 return kvm_pfn_to_page(pfn);
1648 EXPORT_SYMBOL_GPL(gfn_to_page);
1650 struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn)
1654 pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn);
1656 return kvm_pfn_to_page(pfn);
1658 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page);
1660 void kvm_release_page_clean(struct page *page)
1662 WARN_ON(is_error_page(page));
1664 kvm_release_pfn_clean(page_to_pfn(page));
1666 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1668 void kvm_release_pfn_clean(kvm_pfn_t pfn)
1670 if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn))
1671 put_page(pfn_to_page(pfn));
1673 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1675 void kvm_release_page_dirty(struct page *page)
1677 WARN_ON(is_error_page(page));
1679 kvm_release_pfn_dirty(page_to_pfn(page));
1681 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1683 void kvm_release_pfn_dirty(kvm_pfn_t pfn)
1685 kvm_set_pfn_dirty(pfn);
1686 kvm_release_pfn_clean(pfn);
1688 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1690 void kvm_set_pfn_dirty(kvm_pfn_t pfn)
1692 if (!kvm_is_reserved_pfn(pfn)) {
1693 struct page *page = pfn_to_page(pfn);
1695 if (!PageReserved(page))
1699 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1701 void kvm_set_pfn_accessed(kvm_pfn_t pfn)
1703 if (!kvm_is_reserved_pfn(pfn))
1704 mark_page_accessed(pfn_to_page(pfn));
1706 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1708 void kvm_get_pfn(kvm_pfn_t pfn)
1710 if (!kvm_is_reserved_pfn(pfn))
1711 get_page(pfn_to_page(pfn));
1713 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1715 static int next_segment(unsigned long len, int offset)
1717 if (len > PAGE_SIZE - offset)
1718 return PAGE_SIZE - offset;
1723 static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn,
1724 void *data, int offset, int len)
1729 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1730 if (kvm_is_error_hva(addr))
1732 r = __copy_from_user(data, (void __user *)addr + offset, len);
1738 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1741 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1743 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1745 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1747 int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data,
1748 int offset, int len)
1750 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1752 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1754 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page);
1756 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1758 gfn_t gfn = gpa >> PAGE_SHIFT;
1760 int offset = offset_in_page(gpa);
1763 while ((seg = next_segment(len, offset)) != 0) {
1764 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1774 EXPORT_SYMBOL_GPL(kvm_read_guest);
1776 int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len)
1778 gfn_t gfn = gpa >> PAGE_SHIFT;
1780 int offset = offset_in_page(gpa);
1783 while ((seg = next_segment(len, offset)) != 0) {
1784 ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg);
1794 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest);
1796 static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1797 void *data, int offset, unsigned long len)
1802 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1803 if (kvm_is_error_hva(addr))
1805 pagefault_disable();
1806 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1813 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1816 gfn_t gfn = gpa >> PAGE_SHIFT;
1817 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1818 int offset = offset_in_page(gpa);
1820 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1822 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic);
1824 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
1825 void *data, unsigned long len)
1827 gfn_t gfn = gpa >> PAGE_SHIFT;
1828 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1829 int offset = offset_in_page(gpa);
1831 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1833 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);
1835 static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn,
1836 const void *data, int offset, int len)
1841 addr = gfn_to_hva_memslot(memslot, gfn);
1842 if (kvm_is_error_hva(addr))
1844 r = __copy_to_user((void __user *)addr + offset, data, len);
1847 mark_page_dirty_in_slot(memslot, gfn);
1851 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn,
1852 const void *data, int offset, int len)
1854 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1856 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1858 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1860 int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
1861 const void *data, int offset, int len)
1863 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1865 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1867 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page);
1869 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1872 gfn_t gfn = gpa >> PAGE_SHIFT;
1874 int offset = offset_in_page(gpa);
1877 while ((seg = next_segment(len, offset)) != 0) {
1878 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1888 EXPORT_SYMBOL_GPL(kvm_write_guest);
1890 int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
1893 gfn_t gfn = gpa >> PAGE_SHIFT;
1895 int offset = offset_in_page(gpa);
1898 while ((seg = next_segment(len, offset)) != 0) {
1899 ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg);
1909 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest);
1911 static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots,
1912 struct gfn_to_hva_cache *ghc,
1913 gpa_t gpa, unsigned long len)
1915 int offset = offset_in_page(gpa);
1916 gfn_t start_gfn = gpa >> PAGE_SHIFT;
1917 gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
1918 gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
1919 gfn_t nr_pages_avail;
1922 ghc->generation = slots->generation;
1924 ghc->memslot = __gfn_to_memslot(slots, start_gfn);
1925 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL);
1926 if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) {
1930 * If the requested region crosses two memslots, we still
1931 * verify that the entire region is valid here.
1933 while (start_gfn <= end_gfn) {
1935 ghc->memslot = __gfn_to_memslot(slots, start_gfn);
1936 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
1938 if (kvm_is_error_hva(ghc->hva))
1940 start_gfn += nr_pages_avail;
1942 /* Use the slow path for cross page reads and writes. */
1943 ghc->memslot = NULL;
1948 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1949 gpa_t gpa, unsigned long len)
1951 struct kvm_memslots *slots = kvm_memslots(kvm);
1952 return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len);
1954 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1956 int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1957 void *data, int offset, unsigned long len)
1959 struct kvm_memslots *slots = kvm_memslots(kvm);
1961 gpa_t gpa = ghc->gpa + offset;
1963 BUG_ON(len + offset > ghc->len);
1965 if (slots->generation != ghc->generation)
1966 __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
1968 if (unlikely(!ghc->memslot))
1969 return kvm_write_guest(kvm, gpa, data, len);
1971 if (kvm_is_error_hva(ghc->hva))
1974 r = __copy_to_user((void __user *)ghc->hva + offset, data, len);
1977 mark_page_dirty_in_slot(ghc->memslot, gpa >> PAGE_SHIFT);
1981 EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached);
1983 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1984 void *data, unsigned long len)
1986 return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len);
1988 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1990 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1991 void *data, unsigned long len)
1993 struct kvm_memslots *slots = kvm_memslots(kvm);
1996 BUG_ON(len > ghc->len);
1998 if (slots->generation != ghc->generation)
1999 __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
2001 if (unlikely(!ghc->memslot))
2002 return kvm_read_guest(kvm, ghc->gpa, data, len);
2004 if (kvm_is_error_hva(ghc->hva))
2007 r = __copy_from_user(data, (void __user *)ghc->hva, len);
2013 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
2015 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
2017 const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2019 return kvm_write_guest_page(kvm, gfn, zero_page, offset, len);
2021 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
2023 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
2025 gfn_t gfn = gpa >> PAGE_SHIFT;
2027 int offset = offset_in_page(gpa);
2030 while ((seg = next_segment(len, offset)) != 0) {
2031 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
2040 EXPORT_SYMBOL_GPL(kvm_clear_guest);
2042 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot,
2045 if (memslot && memslot->dirty_bitmap) {
2046 unsigned long rel_gfn = gfn - memslot->base_gfn;
2048 set_bit_le(rel_gfn, memslot->dirty_bitmap);
2052 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
2054 struct kvm_memory_slot *memslot;
2056 memslot = gfn_to_memslot(kvm, gfn);
2057 mark_page_dirty_in_slot(memslot, gfn);
2059 EXPORT_SYMBOL_GPL(mark_page_dirty);
2061 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn)
2063 struct kvm_memory_slot *memslot;
2065 memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2066 mark_page_dirty_in_slot(memslot, gfn);
2068 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty);
2070 void kvm_sigset_activate(struct kvm_vcpu *vcpu)
2072 if (!vcpu->sigset_active)
2076 * This does a lockless modification of ->real_blocked, which is fine
2077 * because, only current can change ->real_blocked and all readers of
2078 * ->real_blocked don't care as long ->real_blocked is always a subset
2081 sigprocmask(SIG_SETMASK, &vcpu->sigset, ¤t->real_blocked);
2084 void kvm_sigset_deactivate(struct kvm_vcpu *vcpu)
2086 if (!vcpu->sigset_active)
2089 sigprocmask(SIG_SETMASK, ¤t->real_blocked, NULL);
2090 sigemptyset(¤t->real_blocked);
2093 static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
2095 unsigned int old, val, grow;
2097 old = val = vcpu->halt_poll_ns;
2098 grow = READ_ONCE(halt_poll_ns_grow);
2100 if (val == 0 && grow)
2105 if (val > halt_poll_ns)
2108 vcpu->halt_poll_ns = val;
2109 trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old);
2112 static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
2114 unsigned int old, val, shrink;
2116 old = val = vcpu->halt_poll_ns;
2117 shrink = READ_ONCE(halt_poll_ns_shrink);
2123 vcpu->halt_poll_ns = val;
2124 trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old);
2127 static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
2129 if (kvm_arch_vcpu_runnable(vcpu)) {
2130 kvm_make_request(KVM_REQ_UNHALT, vcpu);
2133 if (kvm_cpu_has_pending_timer(vcpu))
2135 if (signal_pending(current))
2142 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
2144 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
2147 DECLARE_SWAITQUEUE(wait);
2148 bool waited = false;
2151 start = cur = ktime_get();
2152 if (vcpu->halt_poll_ns) {
2153 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
2155 ++vcpu->stat.halt_attempted_poll;
2158 * This sets KVM_REQ_UNHALT if an interrupt
2161 if (kvm_vcpu_check_block(vcpu) < 0) {
2162 ++vcpu->stat.halt_successful_poll;
2163 if (!vcpu_valid_wakeup(vcpu))
2164 ++vcpu->stat.halt_poll_invalid;
2168 } while (single_task_running() && ktime_before(cur, stop));
2171 kvm_arch_vcpu_blocking(vcpu);
2174 prepare_to_swait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
2176 if (kvm_vcpu_check_block(vcpu) < 0)
2183 finish_swait(&vcpu->wq, &wait);
2186 kvm_arch_vcpu_unblocking(vcpu);
2188 block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
2190 if (!vcpu_valid_wakeup(vcpu))
2191 shrink_halt_poll_ns(vcpu);
2192 else if (halt_poll_ns) {
2193 if (block_ns <= vcpu->halt_poll_ns)
2195 /* we had a long block, shrink polling */
2196 else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns)
2197 shrink_halt_poll_ns(vcpu);
2198 /* we had a short halt and our poll time is too small */
2199 else if (vcpu->halt_poll_ns < halt_poll_ns &&
2200 block_ns < halt_poll_ns)
2201 grow_halt_poll_ns(vcpu);
2203 vcpu->halt_poll_ns = 0;
2205 trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu));
2206 kvm_arch_vcpu_block_finish(vcpu);
2208 EXPORT_SYMBOL_GPL(kvm_vcpu_block);
2210 bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
2212 struct swait_queue_head *wqp;
2214 wqp = kvm_arch_vcpu_wq(vcpu);
2215 if (swq_has_sleeper(wqp)) {
2217 ++vcpu->stat.halt_wakeup;
2223 EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up);
2227 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2229 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
2232 int cpu = vcpu->cpu;
2234 if (kvm_vcpu_wake_up(vcpu))
2238 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
2239 if (kvm_arch_vcpu_should_kick(vcpu))
2240 smp_send_reschedule(cpu);
2243 EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
2244 #endif /* !CONFIG_S390 */
2246 int kvm_vcpu_yield_to(struct kvm_vcpu *target)
2249 struct task_struct *task = NULL;
2253 pid = rcu_dereference(target->pid);
2255 task = get_pid_task(pid, PIDTYPE_PID);
2259 ret = yield_to(task, 1);
2260 put_task_struct(task);
2264 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
2267 * Helper that checks whether a VCPU is eligible for directed yield.
2268 * Most eligible candidate to yield is decided by following heuristics:
2270 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2271 * (preempted lock holder), indicated by @in_spin_loop.
2272 * Set at the beiginning and cleared at the end of interception/PLE handler.
2274 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2275 * chance last time (mostly it has become eligible now since we have probably
2276 * yielded to lockholder in last iteration. This is done by toggling
2277 * @dy_eligible each time a VCPU checked for eligibility.)
2279 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2280 * to preempted lock-holder could result in wrong VCPU selection and CPU
2281 * burning. Giving priority for a potential lock-holder increases lock
2284 * Since algorithm is based on heuristics, accessing another VCPU data without
2285 * locking does not harm. It may result in trying to yield to same VCPU, fail
2286 * and continue with next VCPU and so on.
2288 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
2290 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2293 eligible = !vcpu->spin_loop.in_spin_loop ||
2294 vcpu->spin_loop.dy_eligible;
2296 if (vcpu->spin_loop.in_spin_loop)
2297 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
2305 void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode)
2307 struct kvm *kvm = me->kvm;
2308 struct kvm_vcpu *vcpu;
2309 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
2315 kvm_vcpu_set_in_spin_loop(me, true);
2317 * We boost the priority of a VCPU that is runnable but not
2318 * currently running, because it got preempted by something
2319 * else and called schedule in __vcpu_run. Hopefully that
2320 * VCPU is holding the lock that we need and will release it.
2321 * We approximate round-robin by starting at the last boosted VCPU.
2323 for (pass = 0; pass < 2 && !yielded && try; pass++) {
2324 kvm_for_each_vcpu(i, vcpu, kvm) {
2325 if (!pass && i <= last_boosted_vcpu) {
2326 i = last_boosted_vcpu;
2328 } else if (pass && i > last_boosted_vcpu)
2330 if (!READ_ONCE(vcpu->preempted))
2334 if (swait_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
2336 if (yield_to_kernel_mode && !kvm_arch_vcpu_in_kernel(vcpu))
2338 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
2341 yielded = kvm_vcpu_yield_to(vcpu);
2343 kvm->last_boosted_vcpu = i;
2345 } else if (yielded < 0) {
2352 kvm_vcpu_set_in_spin_loop(me, false);
2354 /* Ensure vcpu is not eligible during next spinloop */
2355 kvm_vcpu_set_dy_eligible(me, false);
2357 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
2359 static int kvm_vcpu_fault(struct vm_fault *vmf)
2361 struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data;
2364 if (vmf->pgoff == 0)
2365 page = virt_to_page(vcpu->run);
2367 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
2368 page = virt_to_page(vcpu->arch.pio_data);
2370 #ifdef CONFIG_KVM_MMIO
2371 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
2372 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
2375 return kvm_arch_vcpu_fault(vcpu, vmf);
2381 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
2382 .fault = kvm_vcpu_fault,
2385 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2387 vma->vm_ops = &kvm_vcpu_vm_ops;
2391 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2393 struct kvm_vcpu *vcpu = filp->private_data;
2395 debugfs_remove_recursive(vcpu->debugfs_dentry);
2396 kvm_put_kvm(vcpu->kvm);
2400 static struct file_operations kvm_vcpu_fops = {
2401 .release = kvm_vcpu_release,
2402 .unlocked_ioctl = kvm_vcpu_ioctl,
2403 #ifdef CONFIG_KVM_COMPAT
2404 .compat_ioctl = kvm_vcpu_compat_ioctl,
2406 .mmap = kvm_vcpu_mmap,
2407 .llseek = noop_llseek,
2411 * Allocates an inode for the vcpu.
2413 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2415 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
2418 static int kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
2420 char dir_name[ITOA_MAX_LEN * 2];
2423 if (!kvm_arch_has_vcpu_debugfs())
2426 if (!debugfs_initialized())
2429 snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id);
2430 vcpu->debugfs_dentry = debugfs_create_dir(dir_name,
2431 vcpu->kvm->debugfs_dentry);
2432 if (!vcpu->debugfs_dentry)
2435 ret = kvm_arch_create_vcpu_debugfs(vcpu);
2437 debugfs_remove_recursive(vcpu->debugfs_dentry);
2445 * Creates some virtual cpus. Good luck creating more than one.
2447 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
2450 struct kvm_vcpu *vcpu;
2452 if (id >= KVM_MAX_VCPU_ID)
2455 mutex_lock(&kvm->lock);
2456 if (kvm->created_vcpus == KVM_MAX_VCPUS) {
2457 mutex_unlock(&kvm->lock);
2461 kvm->created_vcpus++;
2462 mutex_unlock(&kvm->lock);
2464 vcpu = kvm_arch_vcpu_create(kvm, id);
2467 goto vcpu_decrement;
2470 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2472 r = kvm_arch_vcpu_setup(vcpu);
2476 r = kvm_create_vcpu_debugfs(vcpu);
2480 mutex_lock(&kvm->lock);
2481 if (kvm_get_vcpu_by_id(kvm, id)) {
2483 goto unlock_vcpu_destroy;
2486 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
2488 /* Now it's all set up, let userspace reach it */
2490 r = create_vcpu_fd(vcpu);
2493 goto unlock_vcpu_destroy;
2496 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
2499 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2500 * before kvm->online_vcpu's incremented value.
2503 atomic_inc(&kvm->online_vcpus);
2505 mutex_unlock(&kvm->lock);
2506 kvm_arch_vcpu_postcreate(vcpu);
2509 unlock_vcpu_destroy:
2510 mutex_unlock(&kvm->lock);
2511 debugfs_remove_recursive(vcpu->debugfs_dentry);
2513 kvm_arch_vcpu_destroy(vcpu);
2515 mutex_lock(&kvm->lock);
2516 kvm->created_vcpus--;
2517 mutex_unlock(&kvm->lock);
2521 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2524 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2525 vcpu->sigset_active = 1;
2526 vcpu->sigset = *sigset;
2528 vcpu->sigset_active = 0;
2532 static long kvm_vcpu_ioctl(struct file *filp,
2533 unsigned int ioctl, unsigned long arg)
2535 struct kvm_vcpu *vcpu = filp->private_data;
2536 void __user *argp = (void __user *)arg;
2538 struct kvm_fpu *fpu = NULL;
2539 struct kvm_sregs *kvm_sregs = NULL;
2541 if (vcpu->kvm->mm != current->mm)
2544 if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
2547 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2549 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2550 * so vcpu_load() would break it.
2552 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT)
2553 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2557 if (mutex_lock_killable(&vcpu->mutex))
2565 oldpid = rcu_access_pointer(vcpu->pid);
2566 if (unlikely(oldpid != current->pids[PIDTYPE_PID].pid)) {
2567 /* The thread running this VCPU changed. */
2568 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
2570 rcu_assign_pointer(vcpu->pid, newpid);
2575 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
2576 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
2579 case KVM_GET_REGS: {
2580 struct kvm_regs *kvm_regs;
2583 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
2586 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
2590 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
2597 case KVM_SET_REGS: {
2598 struct kvm_regs *kvm_regs;
2601 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
2602 if (IS_ERR(kvm_regs)) {
2603 r = PTR_ERR(kvm_regs);
2606 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2610 case KVM_GET_SREGS: {
2611 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
2615 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2619 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2624 case KVM_SET_SREGS: {
2625 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2626 if (IS_ERR(kvm_sregs)) {
2627 r = PTR_ERR(kvm_sregs);
2631 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2634 case KVM_GET_MP_STATE: {
2635 struct kvm_mp_state mp_state;
2637 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2641 if (copy_to_user(argp, &mp_state, sizeof(mp_state)))
2646 case KVM_SET_MP_STATE: {
2647 struct kvm_mp_state mp_state;
2650 if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
2652 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2655 case KVM_TRANSLATE: {
2656 struct kvm_translation tr;
2659 if (copy_from_user(&tr, argp, sizeof(tr)))
2661 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2665 if (copy_to_user(argp, &tr, sizeof(tr)))
2670 case KVM_SET_GUEST_DEBUG: {
2671 struct kvm_guest_debug dbg;
2674 if (copy_from_user(&dbg, argp, sizeof(dbg)))
2677 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2681 case KVM_SET_SIGNAL_MASK: {
2682 struct kvm_signal_mask __user *sigmask_arg = argp;
2683 struct kvm_signal_mask kvm_sigmask;
2684 sigset_t sigset, *p;
2689 if (copy_from_user(&kvm_sigmask, argp,
2690 sizeof(kvm_sigmask)))
2693 if (kvm_sigmask.len != sizeof(sigset))
2696 if (copy_from_user(&sigset, sigmask_arg->sigset,
2701 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2705 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2710 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2715 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2721 fpu = memdup_user(argp, sizeof(*fpu));
2728 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2734 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2738 mutex_unlock(&vcpu->mutex);
2744 #ifdef CONFIG_KVM_COMPAT
2745 static long kvm_vcpu_compat_ioctl(struct file *filp,
2746 unsigned int ioctl, unsigned long arg)
2748 struct kvm_vcpu *vcpu = filp->private_data;
2749 void __user *argp = compat_ptr(arg);
2752 if (vcpu->kvm->mm != current->mm)
2756 case KVM_SET_SIGNAL_MASK: {
2757 struct kvm_signal_mask __user *sigmask_arg = argp;
2758 struct kvm_signal_mask kvm_sigmask;
2763 if (copy_from_user(&kvm_sigmask, argp,
2764 sizeof(kvm_sigmask)))
2767 if (kvm_sigmask.len != sizeof(compat_sigset_t))
2770 if (get_compat_sigset(&sigset, (void *)sigmask_arg->sigset))
2772 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2774 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
2778 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2786 static int kvm_device_ioctl_attr(struct kvm_device *dev,
2787 int (*accessor)(struct kvm_device *dev,
2788 struct kvm_device_attr *attr),
2791 struct kvm_device_attr attr;
2796 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2799 return accessor(dev, &attr);
2802 static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
2805 struct kvm_device *dev = filp->private_data;
2808 case KVM_SET_DEVICE_ATTR:
2809 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
2810 case KVM_GET_DEVICE_ATTR:
2811 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
2812 case KVM_HAS_DEVICE_ATTR:
2813 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
2815 if (dev->ops->ioctl)
2816 return dev->ops->ioctl(dev, ioctl, arg);
2822 static int kvm_device_release(struct inode *inode, struct file *filp)
2824 struct kvm_device *dev = filp->private_data;
2825 struct kvm *kvm = dev->kvm;
2831 static const struct file_operations kvm_device_fops = {
2832 .unlocked_ioctl = kvm_device_ioctl,
2833 #ifdef CONFIG_KVM_COMPAT
2834 .compat_ioctl = kvm_device_ioctl,
2836 .release = kvm_device_release,
2839 struct kvm_device *kvm_device_from_filp(struct file *filp)
2841 if (filp->f_op != &kvm_device_fops)
2844 return filp->private_data;
2847 static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
2848 #ifdef CONFIG_KVM_MPIC
2849 [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops,
2850 [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops,
2854 int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
2856 if (type >= ARRAY_SIZE(kvm_device_ops_table))
2859 if (kvm_device_ops_table[type] != NULL)
2862 kvm_device_ops_table[type] = ops;
2866 void kvm_unregister_device_ops(u32 type)
2868 if (kvm_device_ops_table[type] != NULL)
2869 kvm_device_ops_table[type] = NULL;
2872 static int kvm_ioctl_create_device(struct kvm *kvm,
2873 struct kvm_create_device *cd)
2875 struct kvm_device_ops *ops = NULL;
2876 struct kvm_device *dev;
2877 bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
2880 if (cd->type >= ARRAY_SIZE(kvm_device_ops_table))
2883 ops = kvm_device_ops_table[cd->type];
2890 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2897 mutex_lock(&kvm->lock);
2898 ret = ops->create(dev, cd->type);
2900 mutex_unlock(&kvm->lock);
2904 list_add(&dev->vm_node, &kvm->devices);
2905 mutex_unlock(&kvm->lock);
2910 ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC);
2912 mutex_lock(&kvm->lock);
2913 list_del(&dev->vm_node);
2914 mutex_unlock(&kvm->lock);
2924 static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
2927 case KVM_CAP_USER_MEMORY:
2928 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2929 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2930 case KVM_CAP_INTERNAL_ERROR_DATA:
2931 #ifdef CONFIG_HAVE_KVM_MSI
2932 case KVM_CAP_SIGNAL_MSI:
2934 #ifdef CONFIG_HAVE_KVM_IRQFD
2936 case KVM_CAP_IRQFD_RESAMPLE:
2938 case KVM_CAP_IOEVENTFD_ANY_LENGTH:
2939 case KVM_CAP_CHECK_EXTENSION_VM:
2941 #ifdef CONFIG_KVM_MMIO
2942 case KVM_CAP_COALESCED_MMIO:
2943 return KVM_COALESCED_MMIO_PAGE_OFFSET;
2945 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2946 case KVM_CAP_IRQ_ROUTING:
2947 return KVM_MAX_IRQ_ROUTES;
2949 #if KVM_ADDRESS_SPACE_NUM > 1
2950 case KVM_CAP_MULTI_ADDRESS_SPACE:
2951 return KVM_ADDRESS_SPACE_NUM;
2953 case KVM_CAP_MAX_VCPU_ID:
2954 return KVM_MAX_VCPU_ID;
2958 return kvm_vm_ioctl_check_extension(kvm, arg);
2961 static long kvm_vm_ioctl(struct file *filp,
2962 unsigned int ioctl, unsigned long arg)
2964 struct kvm *kvm = filp->private_data;
2965 void __user *argp = (void __user *)arg;
2968 if (kvm->mm != current->mm)
2971 case KVM_CREATE_VCPU:
2972 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2974 case KVM_SET_USER_MEMORY_REGION: {
2975 struct kvm_userspace_memory_region kvm_userspace_mem;
2978 if (copy_from_user(&kvm_userspace_mem, argp,
2979 sizeof(kvm_userspace_mem)))
2982 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
2985 case KVM_GET_DIRTY_LOG: {
2986 struct kvm_dirty_log log;
2989 if (copy_from_user(&log, argp, sizeof(log)))
2991 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2994 #ifdef CONFIG_KVM_MMIO
2995 case KVM_REGISTER_COALESCED_MMIO: {
2996 struct kvm_coalesced_mmio_zone zone;
2999 if (copy_from_user(&zone, argp, sizeof(zone)))
3001 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
3004 case KVM_UNREGISTER_COALESCED_MMIO: {
3005 struct kvm_coalesced_mmio_zone zone;
3008 if (copy_from_user(&zone, argp, sizeof(zone)))
3010 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
3015 struct kvm_irqfd data;
3018 if (copy_from_user(&data, argp, sizeof(data)))
3020 r = kvm_irqfd(kvm, &data);
3023 case KVM_IOEVENTFD: {
3024 struct kvm_ioeventfd data;
3027 if (copy_from_user(&data, argp, sizeof(data)))
3029 r = kvm_ioeventfd(kvm, &data);
3032 #ifdef CONFIG_HAVE_KVM_MSI
3033 case KVM_SIGNAL_MSI: {
3037 if (copy_from_user(&msi, argp, sizeof(msi)))
3039 r = kvm_send_userspace_msi(kvm, &msi);
3043 #ifdef __KVM_HAVE_IRQ_LINE
3044 case KVM_IRQ_LINE_STATUS:
3045 case KVM_IRQ_LINE: {
3046 struct kvm_irq_level irq_event;
3049 if (copy_from_user(&irq_event, argp, sizeof(irq_event)))
3052 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
3053 ioctl == KVM_IRQ_LINE_STATUS);
3058 if (ioctl == KVM_IRQ_LINE_STATUS) {
3059 if (copy_to_user(argp, &irq_event, sizeof(irq_event)))
3067 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3068 case KVM_SET_GSI_ROUTING: {
3069 struct kvm_irq_routing routing;
3070 struct kvm_irq_routing __user *urouting;
3071 struct kvm_irq_routing_entry *entries = NULL;
3074 if (copy_from_user(&routing, argp, sizeof(routing)))
3077 if (!kvm_arch_can_set_irq_routing(kvm))
3079 if (routing.nr > KVM_MAX_IRQ_ROUTES)
3085 entries = vmalloc(routing.nr * sizeof(*entries));
3090 if (copy_from_user(entries, urouting->entries,
3091 routing.nr * sizeof(*entries)))
3092 goto out_free_irq_routing;
3094 r = kvm_set_irq_routing(kvm, entries, routing.nr,
3096 out_free_irq_routing:
3100 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
3101 case KVM_CREATE_DEVICE: {
3102 struct kvm_create_device cd;
3105 if (copy_from_user(&cd, argp, sizeof(cd)))
3108 r = kvm_ioctl_create_device(kvm, &cd);
3113 if (copy_to_user(argp, &cd, sizeof(cd)))
3119 case KVM_CHECK_EXTENSION:
3120 r = kvm_vm_ioctl_check_extension_generic(kvm, arg);
3123 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
3129 #ifdef CONFIG_KVM_COMPAT
3130 struct compat_kvm_dirty_log {
3134 compat_uptr_t dirty_bitmap; /* one bit per page */
3139 static long kvm_vm_compat_ioctl(struct file *filp,
3140 unsigned int ioctl, unsigned long arg)
3142 struct kvm *kvm = filp->private_data;
3145 if (kvm->mm != current->mm)
3148 case KVM_GET_DIRTY_LOG: {
3149 struct compat_kvm_dirty_log compat_log;
3150 struct kvm_dirty_log log;
3152 if (copy_from_user(&compat_log, (void __user *)arg,
3153 sizeof(compat_log)))
3155 log.slot = compat_log.slot;
3156 log.padding1 = compat_log.padding1;
3157 log.padding2 = compat_log.padding2;
3158 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
3160 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3164 r = kvm_vm_ioctl(filp, ioctl, arg);
3170 static struct file_operations kvm_vm_fops = {
3171 .release = kvm_vm_release,
3172 .unlocked_ioctl = kvm_vm_ioctl,
3173 #ifdef CONFIG_KVM_COMPAT
3174 .compat_ioctl = kvm_vm_compat_ioctl,
3176 .llseek = noop_llseek,
3179 static int kvm_dev_ioctl_create_vm(unsigned long type)
3185 kvm = kvm_create_vm(type);
3187 return PTR_ERR(kvm);
3188 #ifdef CONFIG_KVM_MMIO
3189 r = kvm_coalesced_mmio_init(kvm);
3193 r = get_unused_fd_flags(O_CLOEXEC);
3197 file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
3205 * Don't call kvm_put_kvm anymore at this point; file->f_op is
3206 * already set, with ->release() being kvm_vm_release(). In error
3207 * cases it will be called by the final fput(file) and will take
3208 * care of doing kvm_put_kvm(kvm).
3210 if (kvm_create_vm_debugfs(kvm, r) < 0) {
3215 kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm);
3217 fd_install(r, file);
3225 static long kvm_dev_ioctl(struct file *filp,
3226 unsigned int ioctl, unsigned long arg)
3231 case KVM_GET_API_VERSION:
3234 r = KVM_API_VERSION;
3237 r = kvm_dev_ioctl_create_vm(arg);
3239 case KVM_CHECK_EXTENSION:
3240 r = kvm_vm_ioctl_check_extension_generic(NULL, arg);
3242 case KVM_GET_VCPU_MMAP_SIZE:
3245 r = PAGE_SIZE; /* struct kvm_run */
3247 r += PAGE_SIZE; /* pio data page */
3249 #ifdef CONFIG_KVM_MMIO
3250 r += PAGE_SIZE; /* coalesced mmio ring page */
3253 case KVM_TRACE_ENABLE:
3254 case KVM_TRACE_PAUSE:
3255 case KVM_TRACE_DISABLE:
3259 return kvm_arch_dev_ioctl(filp, ioctl, arg);
3265 static struct file_operations kvm_chardev_ops = {
3266 .unlocked_ioctl = kvm_dev_ioctl,
3267 .compat_ioctl = kvm_dev_ioctl,
3268 .llseek = noop_llseek,
3271 static struct miscdevice kvm_dev = {
3277 static void hardware_enable_nolock(void *junk)
3279 int cpu = raw_smp_processor_id();
3282 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
3285 cpumask_set_cpu(cpu, cpus_hardware_enabled);
3287 r = kvm_arch_hardware_enable();
3290 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3291 atomic_inc(&hardware_enable_failed);
3292 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu);
3296 static int kvm_starting_cpu(unsigned int cpu)
3298 raw_spin_lock(&kvm_count_lock);
3299 if (kvm_usage_count)
3300 hardware_enable_nolock(NULL);
3301 raw_spin_unlock(&kvm_count_lock);
3305 static void hardware_disable_nolock(void *junk)
3307 int cpu = raw_smp_processor_id();
3309 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
3311 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3312 kvm_arch_hardware_disable();
3315 static int kvm_dying_cpu(unsigned int cpu)
3317 raw_spin_lock(&kvm_count_lock);
3318 if (kvm_usage_count)
3319 hardware_disable_nolock(NULL);
3320 raw_spin_unlock(&kvm_count_lock);
3324 static void hardware_disable_all_nolock(void)
3326 BUG_ON(!kvm_usage_count);
3329 if (!kvm_usage_count)
3330 on_each_cpu(hardware_disable_nolock, NULL, 1);
3333 static void hardware_disable_all(void)
3335 raw_spin_lock(&kvm_count_lock);
3336 hardware_disable_all_nolock();
3337 raw_spin_unlock(&kvm_count_lock);
3340 static int hardware_enable_all(void)
3344 raw_spin_lock(&kvm_count_lock);
3347 if (kvm_usage_count == 1) {
3348 atomic_set(&hardware_enable_failed, 0);
3349 on_each_cpu(hardware_enable_nolock, NULL, 1);
3351 if (atomic_read(&hardware_enable_failed)) {
3352 hardware_disable_all_nolock();
3357 raw_spin_unlock(&kvm_count_lock);
3362 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3366 * Some (well, at least mine) BIOSes hang on reboot if
3369 * And Intel TXT required VMX off for all cpu when system shutdown.
3371 pr_info("kvm: exiting hardware virtualization\n");
3372 kvm_rebooting = true;
3373 on_each_cpu(hardware_disable_nolock, NULL, 1);
3377 static struct notifier_block kvm_reboot_notifier = {
3378 .notifier_call = kvm_reboot,
3382 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3386 for (i = 0; i < bus->dev_count; i++) {
3387 struct kvm_io_device *pos = bus->range[i].dev;
3389 kvm_iodevice_destructor(pos);
3394 static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
3395 const struct kvm_io_range *r2)
3397 gpa_t addr1 = r1->addr;
3398 gpa_t addr2 = r2->addr;
3403 /* If r2->len == 0, match the exact address. If r2->len != 0,
3404 * accept any overlapping write. Any order is acceptable for
3405 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3406 * we process all of them.
3419 static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
3421 return kvm_io_bus_cmp(p1, p2);
3424 static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
3425 gpa_t addr, int len)
3427 bus->range[bus->dev_count++] = (struct kvm_io_range) {
3433 sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
3434 kvm_io_bus_sort_cmp, NULL);
3439 static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
3440 gpa_t addr, int len)
3442 struct kvm_io_range *range, key;
3445 key = (struct kvm_io_range) {
3450 range = bsearch(&key, bus->range, bus->dev_count,
3451 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
3455 off = range - bus->range;
3457 while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0)
3463 static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3464 struct kvm_io_range *range, const void *val)
3468 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3472 while (idx < bus->dev_count &&
3473 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3474 if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr,
3483 /* kvm_io_bus_write - called under kvm->slots_lock */
3484 int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3485 int len, const void *val)
3487 struct kvm_io_bus *bus;
3488 struct kvm_io_range range;
3491 range = (struct kvm_io_range) {
3496 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3499 r = __kvm_io_bus_write(vcpu, bus, &range, val);
3500 return r < 0 ? r : 0;
3503 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3504 int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
3505 gpa_t addr, int len, const void *val, long cookie)
3507 struct kvm_io_bus *bus;
3508 struct kvm_io_range range;
3510 range = (struct kvm_io_range) {
3515 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3519 /* First try the device referenced by cookie. */
3520 if ((cookie >= 0) && (cookie < bus->dev_count) &&
3521 (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
3522 if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len,
3527 * cookie contained garbage; fall back to search and return the
3528 * correct cookie value.
3530 return __kvm_io_bus_write(vcpu, bus, &range, val);
3533 static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3534 struct kvm_io_range *range, void *val)
3538 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3542 while (idx < bus->dev_count &&
3543 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3544 if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr,
3552 EXPORT_SYMBOL_GPL(kvm_io_bus_write);
3554 /* kvm_io_bus_read - called under kvm->slots_lock */
3555 int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3558 struct kvm_io_bus *bus;
3559 struct kvm_io_range range;
3562 range = (struct kvm_io_range) {
3567 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3570 r = __kvm_io_bus_read(vcpu, bus, &range, val);
3571 return r < 0 ? r : 0;
3575 /* Caller must hold slots_lock. */
3576 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
3577 int len, struct kvm_io_device *dev)
3579 struct kvm_io_bus *new_bus, *bus;
3581 bus = kvm_get_bus(kvm, bus_idx);
3585 /* exclude ioeventfd which is limited by maximum fd */
3586 if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
3589 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) *
3590 sizeof(struct kvm_io_range)), GFP_KERNEL);
3593 memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
3594 sizeof(struct kvm_io_range)));
3595 kvm_io_bus_insert_dev(new_bus, dev, addr, len);
3596 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3597 synchronize_srcu_expedited(&kvm->srcu);
3603 /* Caller must hold slots_lock. */
3604 void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3605 struct kvm_io_device *dev)
3608 struct kvm_io_bus *new_bus, *bus;
3610 bus = kvm_get_bus(kvm, bus_idx);
3614 for (i = 0; i < bus->dev_count; i++)
3615 if (bus->range[i].dev == dev) {
3619 if (i == bus->dev_count)
3622 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) *
3623 sizeof(struct kvm_io_range)), GFP_KERNEL);
3625 pr_err("kvm: failed to shrink bus, removing it completely\n");
3629 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3630 new_bus->dev_count--;
3631 memcpy(new_bus->range + i, bus->range + i + 1,
3632 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
3635 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3636 synchronize_srcu_expedited(&kvm->srcu);
3641 struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3644 struct kvm_io_bus *bus;
3645 int dev_idx, srcu_idx;
3646 struct kvm_io_device *iodev = NULL;
3648 srcu_idx = srcu_read_lock(&kvm->srcu);
3650 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
3654 dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1);
3658 iodev = bus->range[dev_idx].dev;
3661 srcu_read_unlock(&kvm->srcu, srcu_idx);
3665 EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev);
3667 static int kvm_debugfs_open(struct inode *inode, struct file *file,
3668 int (*get)(void *, u64 *), int (*set)(void *, u64),
3671 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3674 /* The debugfs files are a reference to the kvm struct which
3675 * is still valid when kvm_destroy_vm is called.
3676 * To avoid the race between open and the removal of the debugfs
3677 * directory we test against the users count.
3679 if (!refcount_inc_not_zero(&stat_data->kvm->users_count))
3682 if (simple_attr_open(inode, file, get, set, fmt)) {
3683 kvm_put_kvm(stat_data->kvm);
3690 static int kvm_debugfs_release(struct inode *inode, struct file *file)
3692 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3695 simple_attr_release(inode, file);
3696 kvm_put_kvm(stat_data->kvm);
3701 static int vm_stat_get_per_vm(void *data, u64 *val)
3703 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3705 *val = *(ulong *)((void *)stat_data->kvm + stat_data->offset);
3710 static int vm_stat_clear_per_vm(void *data, u64 val)
3712 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3717 *(ulong *)((void *)stat_data->kvm + stat_data->offset) = 0;
3722 static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file)
3724 __simple_attr_check_format("%llu\n", 0ull);
3725 return kvm_debugfs_open(inode, file, vm_stat_get_per_vm,
3726 vm_stat_clear_per_vm, "%llu\n");
3729 static const struct file_operations vm_stat_get_per_vm_fops = {
3730 .owner = THIS_MODULE,
3731 .open = vm_stat_get_per_vm_open,
3732 .release = kvm_debugfs_release,
3733 .read = simple_attr_read,
3734 .write = simple_attr_write,
3735 .llseek = no_llseek,
3738 static int vcpu_stat_get_per_vm(void *data, u64 *val)
3741 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3742 struct kvm_vcpu *vcpu;
3746 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
3747 *val += *(u64 *)((void *)vcpu + stat_data->offset);
3752 static int vcpu_stat_clear_per_vm(void *data, u64 val)
3755 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3756 struct kvm_vcpu *vcpu;
3761 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
3762 *(u64 *)((void *)vcpu + stat_data->offset) = 0;
3767 static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file)
3769 __simple_attr_check_format("%llu\n", 0ull);
3770 return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm,
3771 vcpu_stat_clear_per_vm, "%llu\n");
3774 static const struct file_operations vcpu_stat_get_per_vm_fops = {
3775 .owner = THIS_MODULE,
3776 .open = vcpu_stat_get_per_vm_open,
3777 .release = kvm_debugfs_release,
3778 .read = simple_attr_read,
3779 .write = simple_attr_write,
3780 .llseek = no_llseek,
3783 static const struct file_operations *stat_fops_per_vm[] = {
3784 [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops,
3785 [KVM_STAT_VM] = &vm_stat_get_per_vm_fops,
3788 static int vm_stat_get(void *_offset, u64 *val)
3790 unsigned offset = (long)_offset;
3792 struct kvm_stat_data stat_tmp = {.offset = offset};
3796 spin_lock(&kvm_lock);
3797 list_for_each_entry(kvm, &vm_list, vm_list) {
3799 vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
3802 spin_unlock(&kvm_lock);
3806 static int vm_stat_clear(void *_offset, u64 val)
3808 unsigned offset = (long)_offset;
3810 struct kvm_stat_data stat_tmp = {.offset = offset};
3815 spin_lock(&kvm_lock);
3816 list_for_each_entry(kvm, &vm_list, vm_list) {
3818 vm_stat_clear_per_vm((void *)&stat_tmp, 0);
3820 spin_unlock(&kvm_lock);
3825 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n");
3827 static int vcpu_stat_get(void *_offset, u64 *val)
3829 unsigned offset = (long)_offset;
3831 struct kvm_stat_data stat_tmp = {.offset = offset};
3835 spin_lock(&kvm_lock);
3836 list_for_each_entry(kvm, &vm_list, vm_list) {
3838 vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
3841 spin_unlock(&kvm_lock);
3845 static int vcpu_stat_clear(void *_offset, u64 val)
3847 unsigned offset = (long)_offset;
3849 struct kvm_stat_data stat_tmp = {.offset = offset};
3854 spin_lock(&kvm_lock);
3855 list_for_each_entry(kvm, &vm_list, vm_list) {
3857 vcpu_stat_clear_per_vm((void *)&stat_tmp, 0);
3859 spin_unlock(&kvm_lock);
3864 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear,
3867 static const struct file_operations *stat_fops[] = {
3868 [KVM_STAT_VCPU] = &vcpu_stat_fops,
3869 [KVM_STAT_VM] = &vm_stat_fops,
3872 static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
3874 struct kobj_uevent_env *env;
3875 unsigned long long created, active;
3877 if (!kvm_dev.this_device || !kvm)
3880 spin_lock(&kvm_lock);
3881 if (type == KVM_EVENT_CREATE_VM) {
3882 kvm_createvm_count++;
3884 } else if (type == KVM_EVENT_DESTROY_VM) {
3887 created = kvm_createvm_count;
3888 active = kvm_active_vms;
3889 spin_unlock(&kvm_lock);
3891 env = kzalloc(sizeof(*env), GFP_KERNEL);
3895 add_uevent_var(env, "CREATED=%llu", created);
3896 add_uevent_var(env, "COUNT=%llu", active);
3898 if (type == KVM_EVENT_CREATE_VM) {
3899 add_uevent_var(env, "EVENT=create");
3900 kvm->userspace_pid = task_pid_nr(current);
3901 } else if (type == KVM_EVENT_DESTROY_VM) {
3902 add_uevent_var(env, "EVENT=destroy");
3904 add_uevent_var(env, "PID=%d", kvm->userspace_pid);
3906 if (kvm->debugfs_dentry) {
3907 char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL);
3910 tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX);
3912 add_uevent_var(env, "STATS_PATH=%s", tmp);
3916 /* no need for checks, since we are adding at most only 5 keys */
3917 env->envp[env->envp_idx++] = NULL;
3918 kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp);
3922 static int kvm_init_debug(void)
3925 struct kvm_stats_debugfs_item *p;
3927 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
3928 if (kvm_debugfs_dir == NULL)
3931 kvm_debugfs_num_entries = 0;
3932 for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) {
3933 if (!debugfs_create_file(p->name, 0644, kvm_debugfs_dir,
3934 (void *)(long)p->offset,
3935 stat_fops[p->kind]))
3942 debugfs_remove_recursive(kvm_debugfs_dir);
3947 static int kvm_suspend(void)
3949 if (kvm_usage_count)
3950 hardware_disable_nolock(NULL);
3954 static void kvm_resume(void)
3956 if (kvm_usage_count) {
3957 WARN_ON(raw_spin_is_locked(&kvm_count_lock));
3958 hardware_enable_nolock(NULL);
3962 static struct syscore_ops kvm_syscore_ops = {
3963 .suspend = kvm_suspend,
3964 .resume = kvm_resume,
3968 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3970 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3973 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3975 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3977 if (vcpu->preempted)
3978 vcpu->preempted = false;
3980 kvm_arch_sched_in(vcpu, cpu);
3982 kvm_arch_vcpu_load(vcpu, cpu);
3985 static void kvm_sched_out(struct preempt_notifier *pn,
3986 struct task_struct *next)
3988 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3990 if (current->state == TASK_RUNNING)
3991 vcpu->preempted = true;
3992 kvm_arch_vcpu_put(vcpu);
3995 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
3996 struct module *module)
4001 r = kvm_arch_init(opaque);
4006 * kvm_arch_init makes sure there's at most one caller
4007 * for architectures that support multiple implementations,
4008 * like intel and amd on x86.
4009 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
4010 * conflicts in case kvm is already setup for another implementation.
4012 r = kvm_irqfd_init();
4016 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
4021 r = kvm_arch_hardware_setup();
4025 for_each_online_cpu(cpu) {
4026 smp_call_function_single(cpu,
4027 kvm_arch_check_processor_compat,
4033 r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting",
4034 kvm_starting_cpu, kvm_dying_cpu);
4037 register_reboot_notifier(&kvm_reboot_notifier);
4039 /* A kmem cache lets us meet the alignment requirements of fx_save. */
4041 vcpu_align = __alignof__(struct kvm_vcpu);
4042 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
4043 SLAB_ACCOUNT, NULL);
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;
4068 r = kvm_init_debug();
4070 pr_err("kvm: create debugfs files failed\n");
4074 r = kvm_vfio_ops_init();
4080 unregister_syscore_ops(&kvm_syscore_ops);
4081 misc_deregister(&kvm_dev);
4083 kvm_async_pf_deinit();
4085 kmem_cache_destroy(kvm_vcpu_cache);
4087 unregister_reboot_notifier(&kvm_reboot_notifier);
4088 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
4091 kvm_arch_hardware_unsetup();
4093 free_cpumask_var(cpus_hardware_enabled);
4101 EXPORT_SYMBOL_GPL(kvm_init);
4105 debugfs_remove_recursive(kvm_debugfs_dir);
4106 misc_deregister(&kvm_dev);
4107 kmem_cache_destroy(kvm_vcpu_cache);
4108 kvm_async_pf_deinit();
4109 unregister_syscore_ops(&kvm_syscore_ops);
4110 unregister_reboot_notifier(&kvm_reboot_notifier);
4111 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
4112 on_each_cpu(hardware_disable_nolock, NULL, 1);
4113 kvm_arch_hardware_unsetup();
4116 free_cpumask_var(cpus_hardware_enabled);
4117 kvm_vfio_ops_exit();
4119 EXPORT_SYMBOL_GPL(kvm_exit);