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.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
44 #include <linux/bitops.h>
45 #include <linux/spinlock.h>
46 #include <linux/compat.h>
47 #include <linux/srcu.h>
48 #include <linux/hugetlb.h>
49 #include <linux/slab.h>
50 #include <linux/sort.h>
51 #include <linux/bsearch.h>
53 #include <asm/processor.h>
55 #include <asm/ioctl.h>
56 #include <asm/uaccess.h>
57 #include <asm/pgtable.h>
59 #include "coalesced_mmio.h"
63 #define CREATE_TRACE_POINTS
64 #include <trace/events/kvm.h>
66 MODULE_AUTHOR("Qumranet");
67 MODULE_LICENSE("GPL");
69 /* Architectures should define their poll value according to the halt latency */
70 static unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT;
71 module_param(halt_poll_ns, uint, S_IRUGO | S_IWUSR);
73 /* Default doubles per-vcpu halt_poll_ns. */
74 static unsigned int halt_poll_ns_grow = 2;
75 module_param(halt_poll_ns_grow, int, S_IRUGO);
77 /* Default resets per-vcpu halt_poll_ns . */
78 static unsigned int halt_poll_ns_shrink;
79 module_param(halt_poll_ns_shrink, int, S_IRUGO);
84 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
87 DEFINE_SPINLOCK(kvm_lock);
88 static DEFINE_RAW_SPINLOCK(kvm_count_lock);
91 static cpumask_var_t cpus_hardware_enabled;
92 static int kvm_usage_count;
93 static atomic_t hardware_enable_failed;
95 struct kmem_cache *kvm_vcpu_cache;
96 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
98 static __read_mostly struct preempt_ops kvm_preempt_ops;
100 struct dentry *kvm_debugfs_dir;
101 EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
103 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
105 #ifdef CONFIG_KVM_COMPAT
106 static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
109 static int hardware_enable_all(void);
110 static void hardware_disable_all(void);
112 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
114 static void kvm_release_pfn_dirty(kvm_pfn_t pfn);
115 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn);
117 __visible bool kvm_rebooting;
118 EXPORT_SYMBOL_GPL(kvm_rebooting);
120 static bool largepages_enabled = true;
122 bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
125 return PageReserved(pfn_to_page(pfn));
131 * Switches to specified vcpu, until a matching vcpu_put()
133 int vcpu_load(struct kvm_vcpu *vcpu)
137 if (mutex_lock_killable(&vcpu->mutex))
140 preempt_notifier_register(&vcpu->preempt_notifier);
141 kvm_arch_vcpu_load(vcpu, cpu);
146 void vcpu_put(struct kvm_vcpu *vcpu)
149 kvm_arch_vcpu_put(vcpu);
150 preempt_notifier_unregister(&vcpu->preempt_notifier);
152 mutex_unlock(&vcpu->mutex);
155 static void ack_flush(void *_completed)
159 bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
164 struct kvm_vcpu *vcpu;
166 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
169 kvm_for_each_vcpu(i, vcpu, kvm) {
170 kvm_make_request(req, vcpu);
173 /* Set ->requests bit before we read ->mode */
176 if (cpus != NULL && cpu != -1 && cpu != me &&
177 kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
178 cpumask_set_cpu(cpu, cpus);
180 if (unlikely(cpus == NULL))
181 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
182 else if (!cpumask_empty(cpus))
183 smp_call_function_many(cpus, ack_flush, NULL, 1);
187 free_cpumask_var(cpus);
191 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
192 void kvm_flush_remote_tlbs(struct kvm *kvm)
194 long dirty_count = kvm->tlbs_dirty;
197 if (kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
198 ++kvm->stat.remote_tlb_flush;
199 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
201 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
204 void kvm_reload_remote_mmus(struct kvm *kvm)
206 kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
209 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
214 mutex_init(&vcpu->mutex);
219 vcpu->halt_poll_ns = 0;
220 init_waitqueue_head(&vcpu->wq);
221 kvm_async_pf_vcpu_init(vcpu);
224 INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
226 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
231 vcpu->run = page_address(page);
233 kvm_vcpu_set_in_spin_loop(vcpu, false);
234 kvm_vcpu_set_dy_eligible(vcpu, false);
235 vcpu->preempted = false;
237 r = kvm_arch_vcpu_init(vcpu);
243 free_page((unsigned long)vcpu->run);
247 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
249 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
252 kvm_arch_vcpu_uninit(vcpu);
253 free_page((unsigned long)vcpu->run);
255 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
257 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
258 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
260 return container_of(mn, struct kvm, mmu_notifier);
263 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
264 struct mm_struct *mm,
265 unsigned long address)
267 struct kvm *kvm = mmu_notifier_to_kvm(mn);
268 int need_tlb_flush, idx;
271 * When ->invalidate_page runs, the linux pte has been zapped
272 * already but the page is still allocated until
273 * ->invalidate_page returns. So if we increase the sequence
274 * here the kvm page fault will notice if the spte can't be
275 * established because the page is going to be freed. If
276 * instead the kvm page fault establishes the spte before
277 * ->invalidate_page runs, kvm_unmap_hva will release it
280 * The sequence increase only need to be seen at spin_unlock
281 * time, and not at spin_lock time.
283 * Increasing the sequence after the spin_unlock would be
284 * unsafe because the kvm page fault could then establish the
285 * pte after kvm_unmap_hva returned, without noticing the page
286 * is going to be freed.
288 idx = srcu_read_lock(&kvm->srcu);
289 spin_lock(&kvm->mmu_lock);
291 kvm->mmu_notifier_seq++;
292 need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
293 /* we've to flush the tlb before the pages can be freed */
295 kvm_flush_remote_tlbs(kvm);
297 spin_unlock(&kvm->mmu_lock);
299 kvm_arch_mmu_notifier_invalidate_page(kvm, address);
301 srcu_read_unlock(&kvm->srcu, idx);
304 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
305 struct mm_struct *mm,
306 unsigned long address,
309 struct kvm *kvm = mmu_notifier_to_kvm(mn);
312 idx = srcu_read_lock(&kvm->srcu);
313 spin_lock(&kvm->mmu_lock);
314 kvm->mmu_notifier_seq++;
315 kvm_set_spte_hva(kvm, address, pte);
316 spin_unlock(&kvm->mmu_lock);
317 srcu_read_unlock(&kvm->srcu, idx);
320 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
321 struct mm_struct *mm,
325 struct kvm *kvm = mmu_notifier_to_kvm(mn);
326 int need_tlb_flush = 0, idx;
328 idx = srcu_read_lock(&kvm->srcu);
329 spin_lock(&kvm->mmu_lock);
331 * The count increase must become visible at unlock time as no
332 * spte can be established without taking the mmu_lock and
333 * count is also read inside the mmu_lock critical section.
335 kvm->mmu_notifier_count++;
336 need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
337 need_tlb_flush |= kvm->tlbs_dirty;
338 /* we've to flush the tlb before the pages can be freed */
340 kvm_flush_remote_tlbs(kvm);
342 spin_unlock(&kvm->mmu_lock);
343 srcu_read_unlock(&kvm->srcu, idx);
346 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
347 struct mm_struct *mm,
351 struct kvm *kvm = mmu_notifier_to_kvm(mn);
353 spin_lock(&kvm->mmu_lock);
355 * This sequence increase will notify the kvm page fault that
356 * the page that is going to be mapped in the spte could have
359 kvm->mmu_notifier_seq++;
362 * The above sequence increase must be visible before the
363 * below count decrease, which is ensured by the smp_wmb above
364 * in conjunction with the smp_rmb in mmu_notifier_retry().
366 kvm->mmu_notifier_count--;
367 spin_unlock(&kvm->mmu_lock);
369 BUG_ON(kvm->mmu_notifier_count < 0);
372 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
373 struct mm_struct *mm,
377 struct kvm *kvm = mmu_notifier_to_kvm(mn);
380 idx = srcu_read_lock(&kvm->srcu);
381 spin_lock(&kvm->mmu_lock);
383 young = kvm_age_hva(kvm, start, end);
385 kvm_flush_remote_tlbs(kvm);
387 spin_unlock(&kvm->mmu_lock);
388 srcu_read_unlock(&kvm->srcu, idx);
393 static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
394 struct mm_struct *mm,
398 struct kvm *kvm = mmu_notifier_to_kvm(mn);
401 idx = srcu_read_lock(&kvm->srcu);
402 spin_lock(&kvm->mmu_lock);
404 * Even though we do not flush TLB, this will still adversely
405 * affect performance on pre-Haswell Intel EPT, where there is
406 * no EPT Access Bit to clear so that we have to tear down EPT
407 * tables instead. If we find this unacceptable, we can always
408 * add a parameter to kvm_age_hva so that it effectively doesn't
409 * do anything on clear_young.
411 * Also note that currently we never issue secondary TLB flushes
412 * from clear_young, leaving this job up to the regular system
413 * cadence. If we find this inaccurate, we might come up with a
414 * more sophisticated heuristic later.
416 young = kvm_age_hva(kvm, start, end);
417 spin_unlock(&kvm->mmu_lock);
418 srcu_read_unlock(&kvm->srcu, idx);
423 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
424 struct mm_struct *mm,
425 unsigned long address)
427 struct kvm *kvm = mmu_notifier_to_kvm(mn);
430 idx = srcu_read_lock(&kvm->srcu);
431 spin_lock(&kvm->mmu_lock);
432 young = kvm_test_age_hva(kvm, address);
433 spin_unlock(&kvm->mmu_lock);
434 srcu_read_unlock(&kvm->srcu, idx);
439 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
440 struct mm_struct *mm)
442 struct kvm *kvm = mmu_notifier_to_kvm(mn);
445 idx = srcu_read_lock(&kvm->srcu);
446 kvm_arch_flush_shadow_all(kvm);
447 srcu_read_unlock(&kvm->srcu, idx);
450 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
451 .invalidate_page = kvm_mmu_notifier_invalidate_page,
452 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
453 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
454 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
455 .clear_young = kvm_mmu_notifier_clear_young,
456 .test_young = kvm_mmu_notifier_test_young,
457 .change_pte = kvm_mmu_notifier_change_pte,
458 .release = kvm_mmu_notifier_release,
461 static int kvm_init_mmu_notifier(struct kvm *kvm)
463 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
464 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
467 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
469 static int kvm_init_mmu_notifier(struct kvm *kvm)
474 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
476 static struct kvm_memslots *kvm_alloc_memslots(void)
479 struct kvm_memslots *slots;
481 slots = kvm_kvzalloc(sizeof(struct kvm_memslots));
486 * Init kvm generation close to the maximum to easily test the
487 * code of handling generation number wrap-around.
489 slots->generation = -150;
490 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
491 slots->id_to_index[i] = slots->memslots[i].id = i;
496 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
498 if (!memslot->dirty_bitmap)
501 kvfree(memslot->dirty_bitmap);
502 memslot->dirty_bitmap = NULL;
506 * Free any memory in @free but not in @dont.
508 static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
509 struct kvm_memory_slot *dont)
511 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
512 kvm_destroy_dirty_bitmap(free);
514 kvm_arch_free_memslot(kvm, free, dont);
519 static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
521 struct kvm_memory_slot *memslot;
526 kvm_for_each_memslot(memslot, slots)
527 kvm_free_memslot(kvm, memslot, NULL);
532 static struct kvm *kvm_create_vm(unsigned long type)
535 struct kvm *kvm = kvm_arch_alloc_vm();
538 return ERR_PTR(-ENOMEM);
540 r = kvm_arch_init_vm(kvm, type);
542 goto out_err_no_disable;
544 r = hardware_enable_all();
546 goto out_err_no_disable;
548 #ifdef CONFIG_HAVE_KVM_IRQFD
549 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
552 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
555 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
556 kvm->memslots[i] = kvm_alloc_memslots();
557 if (!kvm->memslots[i])
558 goto out_err_no_srcu;
561 if (init_srcu_struct(&kvm->srcu))
562 goto out_err_no_srcu;
563 if (init_srcu_struct(&kvm->irq_srcu))
564 goto out_err_no_irq_srcu;
565 for (i = 0; i < KVM_NR_BUSES; i++) {
566 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
572 spin_lock_init(&kvm->mmu_lock);
573 kvm->mm = current->mm;
574 atomic_inc(&kvm->mm->mm_count);
575 kvm_eventfd_init(kvm);
576 mutex_init(&kvm->lock);
577 mutex_init(&kvm->irq_lock);
578 mutex_init(&kvm->slots_lock);
579 atomic_set(&kvm->users_count, 1);
580 INIT_LIST_HEAD(&kvm->devices);
582 r = kvm_init_mmu_notifier(kvm);
586 spin_lock(&kvm_lock);
587 list_add(&kvm->vm_list, &vm_list);
588 spin_unlock(&kvm_lock);
590 preempt_notifier_inc();
595 cleanup_srcu_struct(&kvm->irq_srcu);
597 cleanup_srcu_struct(&kvm->srcu);
599 hardware_disable_all();
601 for (i = 0; i < KVM_NR_BUSES; i++)
602 kfree(kvm->buses[i]);
603 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
604 kvm_free_memslots(kvm, kvm->memslots[i]);
605 kvm_arch_free_vm(kvm);
610 * Avoid using vmalloc for a small buffer.
611 * Should not be used when the size is statically known.
613 void *kvm_kvzalloc(unsigned long size)
615 if (size > PAGE_SIZE)
616 return vzalloc(size);
618 return kzalloc(size, GFP_KERNEL);
621 static void kvm_destroy_devices(struct kvm *kvm)
623 struct list_head *node, *tmp;
625 list_for_each_safe(node, tmp, &kvm->devices) {
626 struct kvm_device *dev =
627 list_entry(node, struct kvm_device, vm_node);
630 dev->ops->destroy(dev);
634 static void kvm_destroy_vm(struct kvm *kvm)
637 struct mm_struct *mm = kvm->mm;
639 kvm_arch_sync_events(kvm);
640 spin_lock(&kvm_lock);
641 list_del(&kvm->vm_list);
642 spin_unlock(&kvm_lock);
643 kvm_free_irq_routing(kvm);
644 for (i = 0; i < KVM_NR_BUSES; i++)
645 kvm_io_bus_destroy(kvm->buses[i]);
646 kvm_coalesced_mmio_free(kvm);
647 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
648 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
650 kvm_arch_flush_shadow_all(kvm);
652 kvm_arch_destroy_vm(kvm);
653 kvm_destroy_devices(kvm);
654 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
655 kvm_free_memslots(kvm, kvm->memslots[i]);
656 cleanup_srcu_struct(&kvm->irq_srcu);
657 cleanup_srcu_struct(&kvm->srcu);
658 kvm_arch_free_vm(kvm);
659 preempt_notifier_dec();
660 hardware_disable_all();
664 void kvm_get_kvm(struct kvm *kvm)
666 atomic_inc(&kvm->users_count);
668 EXPORT_SYMBOL_GPL(kvm_get_kvm);
670 void kvm_put_kvm(struct kvm *kvm)
672 if (atomic_dec_and_test(&kvm->users_count))
675 EXPORT_SYMBOL_GPL(kvm_put_kvm);
678 static int kvm_vm_release(struct inode *inode, struct file *filp)
680 struct kvm *kvm = filp->private_data;
682 kvm_irqfd_release(kvm);
689 * Allocation size is twice as large as the actual dirty bitmap size.
690 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
692 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
694 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
696 memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
697 if (!memslot->dirty_bitmap)
704 * Insert memslot and re-sort memslots based on their GFN,
705 * so binary search could be used to lookup GFN.
706 * Sorting algorithm takes advantage of having initially
707 * sorted array and known changed memslot position.
709 static void update_memslots(struct kvm_memslots *slots,
710 struct kvm_memory_slot *new)
713 int i = slots->id_to_index[id];
714 struct kvm_memory_slot *mslots = slots->memslots;
716 WARN_ON(mslots[i].id != id);
718 WARN_ON(!mslots[i].npages);
719 if (mslots[i].npages)
722 if (!mslots[i].npages)
726 while (i < KVM_MEM_SLOTS_NUM - 1 &&
727 new->base_gfn <= mslots[i + 1].base_gfn) {
728 if (!mslots[i + 1].npages)
730 mslots[i] = mslots[i + 1];
731 slots->id_to_index[mslots[i].id] = i;
736 * The ">=" is needed when creating a slot with base_gfn == 0,
737 * so that it moves before all those with base_gfn == npages == 0.
739 * On the other hand, if new->npages is zero, the above loop has
740 * already left i pointing to the beginning of the empty part of
741 * mslots, and the ">=" would move the hole backwards in this
742 * case---which is wrong. So skip the loop when deleting a slot.
746 new->base_gfn >= mslots[i - 1].base_gfn) {
747 mslots[i] = mslots[i - 1];
748 slots->id_to_index[mslots[i].id] = i;
752 WARN_ON_ONCE(i != slots->used_slots);
755 slots->id_to_index[mslots[i].id] = i;
758 static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem)
760 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
762 #ifdef __KVM_HAVE_READONLY_MEM
763 valid_flags |= KVM_MEM_READONLY;
766 if (mem->flags & ~valid_flags)
772 static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
773 int as_id, struct kvm_memslots *slots)
775 struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id);
778 * Set the low bit in the generation, which disables SPTE caching
779 * until the end of synchronize_srcu_expedited.
781 WARN_ON(old_memslots->generation & 1);
782 slots->generation = old_memslots->generation + 1;
784 rcu_assign_pointer(kvm->memslots[as_id], slots);
785 synchronize_srcu_expedited(&kvm->srcu);
788 * Increment the new memslot generation a second time. This prevents
789 * vm exits that race with memslot updates from caching a memslot
790 * generation that will (potentially) be valid forever.
794 kvm_arch_memslots_updated(kvm, slots);
800 * Allocate some memory and give it an address in the guest physical address
803 * Discontiguous memory is allowed, mostly for framebuffers.
805 * Must be called holding kvm->slots_lock for write.
807 int __kvm_set_memory_region(struct kvm *kvm,
808 const struct kvm_userspace_memory_region *mem)
812 unsigned long npages;
813 struct kvm_memory_slot *slot;
814 struct kvm_memory_slot old, new;
815 struct kvm_memslots *slots = NULL, *old_memslots;
817 enum kvm_mr_change change;
819 r = check_memory_region_flags(mem);
824 as_id = mem->slot >> 16;
827 /* General sanity checks */
828 if (mem->memory_size & (PAGE_SIZE - 1))
830 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
832 /* We can read the guest memory with __xxx_user() later on. */
833 if ((id < KVM_USER_MEM_SLOTS) &&
834 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
835 !access_ok(VERIFY_WRITE,
836 (void __user *)(unsigned long)mem->userspace_addr,
839 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM)
841 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
844 slot = id_to_memslot(__kvm_memslots(kvm, as_id), id);
845 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
846 npages = mem->memory_size >> PAGE_SHIFT;
848 if (npages > KVM_MEM_MAX_NR_PAGES)
854 new.base_gfn = base_gfn;
856 new.flags = mem->flags;
860 change = KVM_MR_CREATE;
861 else { /* Modify an existing slot. */
862 if ((mem->userspace_addr != old.userspace_addr) ||
863 (npages != old.npages) ||
864 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
867 if (base_gfn != old.base_gfn)
868 change = KVM_MR_MOVE;
869 else if (new.flags != old.flags)
870 change = KVM_MR_FLAGS_ONLY;
871 else { /* Nothing to change. */
880 change = KVM_MR_DELETE;
885 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
886 /* Check for overlaps */
888 kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) {
889 if ((slot->id >= KVM_USER_MEM_SLOTS) ||
892 if (!((base_gfn + npages <= slot->base_gfn) ||
893 (base_gfn >= slot->base_gfn + slot->npages)))
898 /* Free page dirty bitmap if unneeded */
899 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
900 new.dirty_bitmap = NULL;
903 if (change == KVM_MR_CREATE) {
904 new.userspace_addr = mem->userspace_addr;
906 if (kvm_arch_create_memslot(kvm, &new, npages))
910 /* Allocate page dirty bitmap if needed */
911 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
912 if (kvm_create_dirty_bitmap(&new) < 0)
916 slots = kvm_kvzalloc(sizeof(struct kvm_memslots));
919 memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots));
921 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
922 slot = id_to_memslot(slots, id);
923 slot->flags |= KVM_MEMSLOT_INVALID;
925 old_memslots = install_new_memslots(kvm, as_id, slots);
927 /* slot was deleted or moved, clear iommu mapping */
928 kvm_iommu_unmap_pages(kvm, &old);
929 /* From this point no new shadow pages pointing to a deleted,
930 * or moved, memslot will be created.
932 * validation of sp->gfn happens in:
933 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
934 * - kvm_is_visible_gfn (mmu_check_roots)
936 kvm_arch_flush_shadow_memslot(kvm, slot);
939 * We can re-use the old_memslots from above, the only difference
940 * from the currently installed memslots is the invalid flag. This
941 * will get overwritten by update_memslots anyway.
943 slots = old_memslots;
946 r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
950 /* actual memory is freed via old in kvm_free_memslot below */
951 if (change == KVM_MR_DELETE) {
952 new.dirty_bitmap = NULL;
953 memset(&new.arch, 0, sizeof(new.arch));
956 update_memslots(slots, &new);
957 old_memslots = install_new_memslots(kvm, as_id, slots);
959 kvm_arch_commit_memory_region(kvm, mem, &old, &new, change);
961 kvm_free_memslot(kvm, &old, &new);
962 kvfree(old_memslots);
965 * IOMMU mapping: New slots need to be mapped. Old slots need to be
966 * un-mapped and re-mapped if their base changes. Since base change
967 * unmapping is handled above with slot deletion, mapping alone is
968 * needed here. Anything else the iommu might care about for existing
969 * slots (size changes, userspace addr changes and read-only flag
970 * changes) is disallowed above, so any other attribute changes getting
971 * here can be skipped.
973 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
974 r = kvm_iommu_map_pages(kvm, &new);
983 kvm_free_memslot(kvm, &new, &old);
987 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
989 int kvm_set_memory_region(struct kvm *kvm,
990 const struct kvm_userspace_memory_region *mem)
994 mutex_lock(&kvm->slots_lock);
995 r = __kvm_set_memory_region(kvm, mem);
996 mutex_unlock(&kvm->slots_lock);
999 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1001 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1002 struct kvm_userspace_memory_region *mem)
1004 if ((u16)mem->slot >= KVM_USER_MEM_SLOTS)
1007 return kvm_set_memory_region(kvm, mem);
1010 int kvm_get_dirty_log(struct kvm *kvm,
1011 struct kvm_dirty_log *log, int *is_dirty)
1013 struct kvm_memslots *slots;
1014 struct kvm_memory_slot *memslot;
1015 int r, i, as_id, id;
1017 unsigned long any = 0;
1020 as_id = log->slot >> 16;
1021 id = (u16)log->slot;
1022 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1025 slots = __kvm_memslots(kvm, as_id);
1026 memslot = id_to_memslot(slots, id);
1028 if (!memslot->dirty_bitmap)
1031 n = kvm_dirty_bitmap_bytes(memslot);
1033 for (i = 0; !any && i < n/sizeof(long); ++i)
1034 any = memslot->dirty_bitmap[i];
1037 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1047 EXPORT_SYMBOL_GPL(kvm_get_dirty_log);
1049 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1051 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1052 * are dirty write protect them for next write.
1053 * @kvm: pointer to kvm instance
1054 * @log: slot id and address to which we copy the log
1055 * @is_dirty: flag set if any page is dirty
1057 * We need to keep it in mind that VCPU threads can write to the bitmap
1058 * concurrently. So, to avoid losing track of dirty pages we keep the
1061 * 1. Take a snapshot of the bit and clear it if needed.
1062 * 2. Write protect the corresponding page.
1063 * 3. Copy the snapshot to the userspace.
1064 * 4. Upon return caller flushes TLB's if needed.
1066 * Between 2 and 4, the guest may write to the page using the remaining TLB
1067 * entry. This is not a problem because the page is reported dirty using
1068 * the snapshot taken before and step 4 ensures that writes done after
1069 * exiting to userspace will be logged for the next call.
1072 int kvm_get_dirty_log_protect(struct kvm *kvm,
1073 struct kvm_dirty_log *log, bool *is_dirty)
1075 struct kvm_memslots *slots;
1076 struct kvm_memory_slot *memslot;
1077 int r, i, as_id, id;
1079 unsigned long *dirty_bitmap;
1080 unsigned long *dirty_bitmap_buffer;
1083 as_id = log->slot >> 16;
1084 id = (u16)log->slot;
1085 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1088 slots = __kvm_memslots(kvm, as_id);
1089 memslot = id_to_memslot(slots, id);
1091 dirty_bitmap = memslot->dirty_bitmap;
1096 n = kvm_dirty_bitmap_bytes(memslot);
1098 dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long);
1099 memset(dirty_bitmap_buffer, 0, n);
1101 spin_lock(&kvm->mmu_lock);
1103 for (i = 0; i < n / sizeof(long); i++) {
1107 if (!dirty_bitmap[i])
1112 mask = xchg(&dirty_bitmap[i], 0);
1113 dirty_bitmap_buffer[i] = mask;
1116 offset = i * BITS_PER_LONG;
1117 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
1122 spin_unlock(&kvm->mmu_lock);
1125 if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
1132 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect);
1135 bool kvm_largepages_enabled(void)
1137 return largepages_enabled;
1140 void kvm_disable_largepages(void)
1142 largepages_enabled = false;
1144 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
1146 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1148 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1150 EXPORT_SYMBOL_GPL(gfn_to_memslot);
1152 struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn)
1154 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn);
1157 bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1159 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1161 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
1162 memslot->flags & KVM_MEMSLOT_INVALID)
1167 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1169 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1171 struct vm_area_struct *vma;
1172 unsigned long addr, size;
1176 addr = gfn_to_hva(kvm, gfn);
1177 if (kvm_is_error_hva(addr))
1180 down_read(¤t->mm->mmap_sem);
1181 vma = find_vma(current->mm, addr);
1185 size = vma_kernel_pagesize(vma);
1188 up_read(¤t->mm->mmap_sem);
1193 static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1195 return slot->flags & KVM_MEM_READONLY;
1198 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1199 gfn_t *nr_pages, bool write)
1201 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1202 return KVM_HVA_ERR_BAD;
1204 if (memslot_is_readonly(slot) && write)
1205 return KVM_HVA_ERR_RO_BAD;
1208 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1210 return __gfn_to_hva_memslot(slot, gfn);
1213 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1216 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1219 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1222 return gfn_to_hva_many(slot, gfn, NULL);
1224 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1226 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1228 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1230 EXPORT_SYMBOL_GPL(gfn_to_hva);
1232 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn)
1234 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL);
1236 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva);
1239 * If writable is set to false, the hva returned by this function is only
1240 * allowed to be read.
1242 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot,
1243 gfn_t gfn, bool *writable)
1245 unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false);
1247 if (!kvm_is_error_hva(hva) && writable)
1248 *writable = !memslot_is_readonly(slot);
1253 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
1255 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1257 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1260 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable)
1262 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1264 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1267 static int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1268 unsigned long start, int write, struct page **page)
1270 int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1273 flags |= FOLL_WRITE;
1275 return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1278 static inline int check_user_page_hwpoison(unsigned long addr)
1280 int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1282 rc = __get_user_pages(current, current->mm, addr, 1,
1283 flags, NULL, NULL, NULL);
1284 return rc == -EHWPOISON;
1288 * The atomic path to get the writable pfn which will be stored in @pfn,
1289 * true indicates success, otherwise false is returned.
1291 static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async,
1292 bool write_fault, bool *writable, kvm_pfn_t *pfn)
1294 struct page *page[1];
1297 if (!(async || atomic))
1301 * Fast pin a writable pfn only if it is a write fault request
1302 * or the caller allows to map a writable pfn for a read fault
1305 if (!(write_fault || writable))
1308 npages = __get_user_pages_fast(addr, 1, 1, page);
1310 *pfn = page_to_pfn(page[0]);
1321 * The slow path to get the pfn of the specified host virtual address,
1322 * 1 indicates success, -errno is returned if error is detected.
1324 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1325 bool *writable, kvm_pfn_t *pfn)
1327 struct page *page[1];
1333 *writable = write_fault;
1336 down_read(¤t->mm->mmap_sem);
1337 npages = get_user_page_nowait(current, current->mm,
1338 addr, write_fault, page);
1339 up_read(¤t->mm->mmap_sem);
1341 npages = __get_user_pages_unlocked(current, current->mm, addr, 1,
1342 write_fault, 0, page,
1343 FOLL_TOUCH|FOLL_HWPOISON);
1347 /* map read fault as writable if possible */
1348 if (unlikely(!write_fault) && writable) {
1349 struct page *wpage[1];
1351 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1360 *pfn = page_to_pfn(page[0]);
1364 static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1366 if (unlikely(!(vma->vm_flags & VM_READ)))
1369 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1376 * Pin guest page in memory and return its pfn.
1377 * @addr: host virtual address which maps memory to the guest
1378 * @atomic: whether this function can sleep
1379 * @async: whether this function need to wait IO complete if the
1380 * host page is not in the memory
1381 * @write_fault: whether we should get a writable host page
1382 * @writable: whether it allows to map a writable host page for !@write_fault
1384 * The function will map a writable host page for these two cases:
1385 * 1): @write_fault = true
1386 * 2): @write_fault = false && @writable, @writable will tell the caller
1387 * whether the mapping is writable.
1389 static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1390 bool write_fault, bool *writable)
1392 struct vm_area_struct *vma;
1396 /* we can do it either atomically or asynchronously, not both */
1397 BUG_ON(atomic && async);
1399 if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn))
1403 return KVM_PFN_ERR_FAULT;
1405 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1409 down_read(¤t->mm->mmap_sem);
1410 if (npages == -EHWPOISON ||
1411 (!async && check_user_page_hwpoison(addr))) {
1412 pfn = KVM_PFN_ERR_HWPOISON;
1416 vma = find_vma_intersection(current->mm, addr, addr + 1);
1419 pfn = KVM_PFN_ERR_FAULT;
1420 else if ((vma->vm_flags & VM_PFNMAP)) {
1421 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1423 BUG_ON(!kvm_is_reserved_pfn(pfn));
1425 if (async && vma_is_valid(vma, write_fault))
1427 pfn = KVM_PFN_ERR_FAULT;
1430 up_read(¤t->mm->mmap_sem);
1434 kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
1435 bool atomic, bool *async, bool write_fault,
1438 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1440 if (addr == KVM_HVA_ERR_RO_BAD)
1441 return KVM_PFN_ERR_RO_FAULT;
1443 if (kvm_is_error_hva(addr))
1444 return KVM_PFN_NOSLOT;
1446 /* Do not map writable pfn in the readonly memslot. */
1447 if (writable && memslot_is_readonly(slot)) {
1452 return hva_to_pfn(addr, atomic, async, write_fault,
1455 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot);
1457 kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1460 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL,
1461 write_fault, writable);
1463 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1465 kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1467 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1469 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot);
1471 kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1473 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1475 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1477 kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1479 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn);
1481 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1483 kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn)
1485 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1487 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic);
1489 kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1491 return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn);
1493 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1495 kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
1497 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1499 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn);
1501 int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1502 struct page **pages, int nr_pages)
1507 addr = gfn_to_hva_many(slot, gfn, &entry);
1508 if (kvm_is_error_hva(addr))
1511 if (entry < nr_pages)
1514 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1516 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1518 static struct page *kvm_pfn_to_page(kvm_pfn_t pfn)
1520 if (is_error_noslot_pfn(pfn))
1521 return KVM_ERR_PTR_BAD_PAGE;
1523 if (kvm_is_reserved_pfn(pfn)) {
1525 return KVM_ERR_PTR_BAD_PAGE;
1528 return pfn_to_page(pfn);
1531 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1535 pfn = gfn_to_pfn(kvm, gfn);
1537 return kvm_pfn_to_page(pfn);
1539 EXPORT_SYMBOL_GPL(gfn_to_page);
1541 struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn)
1545 pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn);
1547 return kvm_pfn_to_page(pfn);
1549 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page);
1551 void kvm_release_page_clean(struct page *page)
1553 WARN_ON(is_error_page(page));
1555 kvm_release_pfn_clean(page_to_pfn(page));
1557 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1559 void kvm_release_pfn_clean(kvm_pfn_t pfn)
1561 if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn))
1562 put_page(pfn_to_page(pfn));
1564 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1566 void kvm_release_page_dirty(struct page *page)
1568 WARN_ON(is_error_page(page));
1570 kvm_release_pfn_dirty(page_to_pfn(page));
1572 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1574 static void kvm_release_pfn_dirty(kvm_pfn_t pfn)
1576 kvm_set_pfn_dirty(pfn);
1577 kvm_release_pfn_clean(pfn);
1580 void kvm_set_pfn_dirty(kvm_pfn_t pfn)
1582 if (!kvm_is_reserved_pfn(pfn)) {
1583 struct page *page = pfn_to_page(pfn);
1585 if (!PageReserved(page))
1589 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1591 void kvm_set_pfn_accessed(kvm_pfn_t pfn)
1593 if (!kvm_is_reserved_pfn(pfn))
1594 mark_page_accessed(pfn_to_page(pfn));
1596 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1598 void kvm_get_pfn(kvm_pfn_t pfn)
1600 if (!kvm_is_reserved_pfn(pfn))
1601 get_page(pfn_to_page(pfn));
1603 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1605 static int next_segment(unsigned long len, int offset)
1607 if (len > PAGE_SIZE - offset)
1608 return PAGE_SIZE - offset;
1613 static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn,
1614 void *data, int offset, int len)
1619 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1620 if (kvm_is_error_hva(addr))
1622 r = __copy_from_user(data, (void __user *)addr + offset, len);
1628 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1631 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1633 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1635 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1637 int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data,
1638 int offset, int len)
1640 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1642 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1644 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page);
1646 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1648 gfn_t gfn = gpa >> PAGE_SHIFT;
1650 int offset = offset_in_page(gpa);
1653 while ((seg = next_segment(len, offset)) != 0) {
1654 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1664 EXPORT_SYMBOL_GPL(kvm_read_guest);
1666 int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len)
1668 gfn_t gfn = gpa >> PAGE_SHIFT;
1670 int offset = offset_in_page(gpa);
1673 while ((seg = next_segment(len, offset)) != 0) {
1674 ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg);
1684 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest);
1686 static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1687 void *data, int offset, unsigned long len)
1692 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1693 if (kvm_is_error_hva(addr))
1695 pagefault_disable();
1696 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1703 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1706 gfn_t gfn = gpa >> PAGE_SHIFT;
1707 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1708 int offset = offset_in_page(gpa);
1710 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1712 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic);
1714 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
1715 void *data, unsigned long len)
1717 gfn_t gfn = gpa >> PAGE_SHIFT;
1718 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1719 int offset = offset_in_page(gpa);
1721 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1723 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);
1725 static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn,
1726 const void *data, int offset, int len)
1731 addr = gfn_to_hva_memslot(memslot, gfn);
1732 if (kvm_is_error_hva(addr))
1734 r = __copy_to_user((void __user *)addr + offset, data, len);
1737 mark_page_dirty_in_slot(memslot, gfn);
1741 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn,
1742 const void *data, int offset, int len)
1744 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1746 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1748 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1750 int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
1751 const void *data, int offset, int len)
1753 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1755 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1757 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page);
1759 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1762 gfn_t gfn = gpa >> PAGE_SHIFT;
1764 int offset = offset_in_page(gpa);
1767 while ((seg = next_segment(len, offset)) != 0) {
1768 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1778 EXPORT_SYMBOL_GPL(kvm_write_guest);
1780 int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
1783 gfn_t gfn = gpa >> PAGE_SHIFT;
1785 int offset = offset_in_page(gpa);
1788 while ((seg = next_segment(len, offset)) != 0) {
1789 ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg);
1799 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest);
1801 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1802 gpa_t gpa, unsigned long len)
1804 struct kvm_memslots *slots = kvm_memslots(kvm);
1805 int offset = offset_in_page(gpa);
1806 gfn_t start_gfn = gpa >> PAGE_SHIFT;
1807 gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
1808 gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
1809 gfn_t nr_pages_avail;
1812 ghc->generation = slots->generation;
1814 ghc->memslot = gfn_to_memslot(kvm, start_gfn);
1815 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL);
1816 if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) {
1820 * If the requested region crosses two memslots, we still
1821 * verify that the entire region is valid here.
1823 while (start_gfn <= end_gfn) {
1824 ghc->memslot = gfn_to_memslot(kvm, start_gfn);
1825 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
1827 if (kvm_is_error_hva(ghc->hva))
1829 start_gfn += nr_pages_avail;
1831 /* Use the slow path for cross page reads and writes. */
1832 ghc->memslot = NULL;
1836 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1838 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1839 void *data, unsigned long len)
1841 struct kvm_memslots *slots = kvm_memslots(kvm);
1844 BUG_ON(len > ghc->len);
1846 if (slots->generation != ghc->generation)
1847 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1849 if (unlikely(!ghc->memslot))
1850 return kvm_write_guest(kvm, ghc->gpa, data, len);
1852 if (kvm_is_error_hva(ghc->hva))
1855 r = __copy_to_user((void __user *)ghc->hva, data, len);
1858 mark_page_dirty_in_slot(ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1862 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1864 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1865 void *data, unsigned long len)
1867 struct kvm_memslots *slots = kvm_memslots(kvm);
1870 BUG_ON(len > ghc->len);
1872 if (slots->generation != ghc->generation)
1873 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1875 if (unlikely(!ghc->memslot))
1876 return kvm_read_guest(kvm, ghc->gpa, data, len);
1878 if (kvm_is_error_hva(ghc->hva))
1881 r = __copy_from_user(data, (void __user *)ghc->hva, len);
1887 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1889 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1891 const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0)));
1893 return kvm_write_guest_page(kvm, gfn, zero_page, offset, len);
1895 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1897 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1899 gfn_t gfn = gpa >> PAGE_SHIFT;
1901 int offset = offset_in_page(gpa);
1904 while ((seg = next_segment(len, offset)) != 0) {
1905 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1914 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1916 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot,
1919 if (memslot && memslot->dirty_bitmap) {
1920 unsigned long rel_gfn = gfn - memslot->base_gfn;
1922 set_bit_le(rel_gfn, memslot->dirty_bitmap);
1926 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1928 struct kvm_memory_slot *memslot;
1930 memslot = gfn_to_memslot(kvm, gfn);
1931 mark_page_dirty_in_slot(memslot, gfn);
1933 EXPORT_SYMBOL_GPL(mark_page_dirty);
1935 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn)
1937 struct kvm_memory_slot *memslot;
1939 memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1940 mark_page_dirty_in_slot(memslot, gfn);
1942 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty);
1944 static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
1948 old = val = vcpu->halt_poll_ns;
1950 if (val == 0 && halt_poll_ns_grow)
1953 val *= halt_poll_ns_grow;
1955 vcpu->halt_poll_ns = val;
1956 trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old);
1959 static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
1963 old = val = vcpu->halt_poll_ns;
1964 if (halt_poll_ns_shrink == 0)
1967 val /= halt_poll_ns_shrink;
1969 vcpu->halt_poll_ns = val;
1970 trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old);
1973 static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
1975 if (kvm_arch_vcpu_runnable(vcpu)) {
1976 kvm_make_request(KVM_REQ_UNHALT, vcpu);
1979 if (kvm_cpu_has_pending_timer(vcpu))
1981 if (signal_pending(current))
1988 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1990 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1994 bool waited = false;
1997 start = cur = ktime_get();
1998 if (vcpu->halt_poll_ns) {
1999 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
2001 ++vcpu->stat.halt_attempted_poll;
2004 * This sets KVM_REQ_UNHALT if an interrupt
2007 if (kvm_vcpu_check_block(vcpu) < 0) {
2008 ++vcpu->stat.halt_successful_poll;
2012 } while (single_task_running() && ktime_before(cur, stop));
2015 kvm_arch_vcpu_blocking(vcpu);
2018 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
2020 if (kvm_vcpu_check_block(vcpu) < 0)
2027 finish_wait(&vcpu->wq, &wait);
2030 kvm_arch_vcpu_unblocking(vcpu);
2032 block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
2035 if (block_ns <= vcpu->halt_poll_ns)
2037 /* we had a long block, shrink polling */
2038 else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns)
2039 shrink_halt_poll_ns(vcpu);
2040 /* we had a short halt and our poll time is too small */
2041 else if (vcpu->halt_poll_ns < halt_poll_ns &&
2042 block_ns < halt_poll_ns)
2043 grow_halt_poll_ns(vcpu);
2045 vcpu->halt_poll_ns = 0;
2047 trace_kvm_vcpu_wakeup(block_ns, waited);
2049 EXPORT_SYMBOL_GPL(kvm_vcpu_block);
2053 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2055 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
2058 int cpu = vcpu->cpu;
2059 wait_queue_head_t *wqp;
2061 wqp = kvm_arch_vcpu_wq(vcpu);
2062 if (waitqueue_active(wqp)) {
2063 wake_up_interruptible(wqp);
2064 ++vcpu->stat.halt_wakeup;
2068 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
2069 if (kvm_arch_vcpu_should_kick(vcpu))
2070 smp_send_reschedule(cpu);
2073 EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
2074 #endif /* !CONFIG_S390 */
2076 int kvm_vcpu_yield_to(struct kvm_vcpu *target)
2079 struct task_struct *task = NULL;
2083 pid = rcu_dereference(target->pid);
2085 task = get_pid_task(pid, PIDTYPE_PID);
2089 ret = yield_to(task, 1);
2090 put_task_struct(task);
2094 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
2097 * Helper that checks whether a VCPU is eligible for directed yield.
2098 * Most eligible candidate to yield is decided by following heuristics:
2100 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2101 * (preempted lock holder), indicated by @in_spin_loop.
2102 * Set at the beiginning and cleared at the end of interception/PLE handler.
2104 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2105 * chance last time (mostly it has become eligible now since we have probably
2106 * yielded to lockholder in last iteration. This is done by toggling
2107 * @dy_eligible each time a VCPU checked for eligibility.)
2109 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2110 * to preempted lock-holder could result in wrong VCPU selection and CPU
2111 * burning. Giving priority for a potential lock-holder increases lock
2114 * Since algorithm is based on heuristics, accessing another VCPU data without
2115 * locking does not harm. It may result in trying to yield to same VCPU, fail
2116 * and continue with next VCPU and so on.
2118 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
2120 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2123 eligible = !vcpu->spin_loop.in_spin_loop ||
2124 vcpu->spin_loop.dy_eligible;
2126 if (vcpu->spin_loop.in_spin_loop)
2127 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
2135 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
2137 struct kvm *kvm = me->kvm;
2138 struct kvm_vcpu *vcpu;
2139 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
2145 kvm_vcpu_set_in_spin_loop(me, true);
2147 * We boost the priority of a VCPU that is runnable but not
2148 * currently running, because it got preempted by something
2149 * else and called schedule in __vcpu_run. Hopefully that
2150 * VCPU is holding the lock that we need and will release it.
2151 * We approximate round-robin by starting at the last boosted VCPU.
2153 for (pass = 0; pass < 2 && !yielded && try; pass++) {
2154 kvm_for_each_vcpu(i, vcpu, kvm) {
2155 if (!pass && i <= last_boosted_vcpu) {
2156 i = last_boosted_vcpu;
2158 } else if (pass && i > last_boosted_vcpu)
2160 if (!ACCESS_ONCE(vcpu->preempted))
2164 if (waitqueue_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
2166 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
2169 yielded = kvm_vcpu_yield_to(vcpu);
2171 kvm->last_boosted_vcpu = i;
2173 } else if (yielded < 0) {
2180 kvm_vcpu_set_in_spin_loop(me, false);
2182 /* Ensure vcpu is not eligible during next spinloop */
2183 kvm_vcpu_set_dy_eligible(me, false);
2185 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
2187 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2189 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2192 if (vmf->pgoff == 0)
2193 page = virt_to_page(vcpu->run);
2195 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
2196 page = virt_to_page(vcpu->arch.pio_data);
2198 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2199 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
2200 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
2203 return kvm_arch_vcpu_fault(vcpu, vmf);
2209 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
2210 .fault = kvm_vcpu_fault,
2213 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2215 vma->vm_ops = &kvm_vcpu_vm_ops;
2219 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2221 struct kvm_vcpu *vcpu = filp->private_data;
2223 kvm_put_kvm(vcpu->kvm);
2227 static struct file_operations kvm_vcpu_fops = {
2228 .release = kvm_vcpu_release,
2229 .unlocked_ioctl = kvm_vcpu_ioctl,
2230 #ifdef CONFIG_KVM_COMPAT
2231 .compat_ioctl = kvm_vcpu_compat_ioctl,
2233 .mmap = kvm_vcpu_mmap,
2234 .llseek = noop_llseek,
2238 * Allocates an inode for the vcpu.
2240 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2242 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
2246 * Creates some virtual cpus. Good luck creating more than one.
2248 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
2251 struct kvm_vcpu *vcpu;
2253 if (id >= KVM_MAX_VCPUS)
2256 vcpu = kvm_arch_vcpu_create(kvm, id);
2258 return PTR_ERR(vcpu);
2260 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2262 r = kvm_arch_vcpu_setup(vcpu);
2266 mutex_lock(&kvm->lock);
2267 if (!kvm_vcpu_compatible(vcpu)) {
2269 goto unlock_vcpu_destroy;
2271 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
2273 goto unlock_vcpu_destroy;
2275 if (kvm_get_vcpu_by_id(kvm, id)) {
2277 goto unlock_vcpu_destroy;
2280 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
2282 /* Now it's all set up, let userspace reach it */
2284 r = create_vcpu_fd(vcpu);
2287 goto unlock_vcpu_destroy;
2290 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
2293 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2294 * before kvm->online_vcpu's incremented value.
2297 atomic_inc(&kvm->online_vcpus);
2299 mutex_unlock(&kvm->lock);
2300 kvm_arch_vcpu_postcreate(vcpu);
2303 unlock_vcpu_destroy:
2304 mutex_unlock(&kvm->lock);
2306 kvm_arch_vcpu_destroy(vcpu);
2310 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2313 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2314 vcpu->sigset_active = 1;
2315 vcpu->sigset = *sigset;
2317 vcpu->sigset_active = 0;
2321 static long kvm_vcpu_ioctl(struct file *filp,
2322 unsigned int ioctl, unsigned long arg)
2324 struct kvm_vcpu *vcpu = filp->private_data;
2325 void __user *argp = (void __user *)arg;
2327 struct kvm_fpu *fpu = NULL;
2328 struct kvm_sregs *kvm_sregs = NULL;
2330 if (vcpu->kvm->mm != current->mm)
2333 if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
2336 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2338 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2339 * so vcpu_load() would break it.
2341 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT)
2342 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2346 r = vcpu_load(vcpu);
2354 if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
2355 /* The thread running this VCPU changed. */
2356 struct pid *oldpid = vcpu->pid;
2357 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
2359 rcu_assign_pointer(vcpu->pid, newpid);
2364 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
2365 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
2367 case KVM_GET_REGS: {
2368 struct kvm_regs *kvm_regs;
2371 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
2374 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
2378 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
2385 case KVM_SET_REGS: {
2386 struct kvm_regs *kvm_regs;
2389 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
2390 if (IS_ERR(kvm_regs)) {
2391 r = PTR_ERR(kvm_regs);
2394 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2398 case KVM_GET_SREGS: {
2399 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
2403 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2407 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2412 case KVM_SET_SREGS: {
2413 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2414 if (IS_ERR(kvm_sregs)) {
2415 r = PTR_ERR(kvm_sregs);
2419 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2422 case KVM_GET_MP_STATE: {
2423 struct kvm_mp_state mp_state;
2425 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2429 if (copy_to_user(argp, &mp_state, sizeof(mp_state)))
2434 case KVM_SET_MP_STATE: {
2435 struct kvm_mp_state mp_state;
2438 if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
2440 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2443 case KVM_TRANSLATE: {
2444 struct kvm_translation tr;
2447 if (copy_from_user(&tr, argp, sizeof(tr)))
2449 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2453 if (copy_to_user(argp, &tr, sizeof(tr)))
2458 case KVM_SET_GUEST_DEBUG: {
2459 struct kvm_guest_debug dbg;
2462 if (copy_from_user(&dbg, argp, sizeof(dbg)))
2464 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2467 case KVM_SET_SIGNAL_MASK: {
2468 struct kvm_signal_mask __user *sigmask_arg = argp;
2469 struct kvm_signal_mask kvm_sigmask;
2470 sigset_t sigset, *p;
2475 if (copy_from_user(&kvm_sigmask, argp,
2476 sizeof(kvm_sigmask)))
2479 if (kvm_sigmask.len != sizeof(sigset))
2482 if (copy_from_user(&sigset, sigmask_arg->sigset,
2487 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2491 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2495 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2499 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2505 fpu = memdup_user(argp, sizeof(*fpu));
2511 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2515 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2524 #ifdef CONFIG_KVM_COMPAT
2525 static long kvm_vcpu_compat_ioctl(struct file *filp,
2526 unsigned int ioctl, unsigned long arg)
2528 struct kvm_vcpu *vcpu = filp->private_data;
2529 void __user *argp = compat_ptr(arg);
2532 if (vcpu->kvm->mm != current->mm)
2536 case KVM_SET_SIGNAL_MASK: {
2537 struct kvm_signal_mask __user *sigmask_arg = argp;
2538 struct kvm_signal_mask kvm_sigmask;
2539 compat_sigset_t csigset;
2544 if (copy_from_user(&kvm_sigmask, argp,
2545 sizeof(kvm_sigmask)))
2548 if (kvm_sigmask.len != sizeof(csigset))
2551 if (copy_from_user(&csigset, sigmask_arg->sigset,
2554 sigset_from_compat(&sigset, &csigset);
2555 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2557 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
2561 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2569 static int kvm_device_ioctl_attr(struct kvm_device *dev,
2570 int (*accessor)(struct kvm_device *dev,
2571 struct kvm_device_attr *attr),
2574 struct kvm_device_attr attr;
2579 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2582 return accessor(dev, &attr);
2585 static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
2588 struct kvm_device *dev = filp->private_data;
2591 case KVM_SET_DEVICE_ATTR:
2592 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
2593 case KVM_GET_DEVICE_ATTR:
2594 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
2595 case KVM_HAS_DEVICE_ATTR:
2596 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
2598 if (dev->ops->ioctl)
2599 return dev->ops->ioctl(dev, ioctl, arg);
2605 static int kvm_device_release(struct inode *inode, struct file *filp)
2607 struct kvm_device *dev = filp->private_data;
2608 struct kvm *kvm = dev->kvm;
2614 static const struct file_operations kvm_device_fops = {
2615 .unlocked_ioctl = kvm_device_ioctl,
2616 #ifdef CONFIG_KVM_COMPAT
2617 .compat_ioctl = kvm_device_ioctl,
2619 .release = kvm_device_release,
2622 struct kvm_device *kvm_device_from_filp(struct file *filp)
2624 if (filp->f_op != &kvm_device_fops)
2627 return filp->private_data;
2630 static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
2631 #ifdef CONFIG_KVM_MPIC
2632 [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops,
2633 [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops,
2636 #ifdef CONFIG_KVM_XICS
2637 [KVM_DEV_TYPE_XICS] = &kvm_xics_ops,
2641 int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
2643 if (type >= ARRAY_SIZE(kvm_device_ops_table))
2646 if (kvm_device_ops_table[type] != NULL)
2649 kvm_device_ops_table[type] = ops;
2653 void kvm_unregister_device_ops(u32 type)
2655 if (kvm_device_ops_table[type] != NULL)
2656 kvm_device_ops_table[type] = NULL;
2659 static int kvm_ioctl_create_device(struct kvm *kvm,
2660 struct kvm_create_device *cd)
2662 struct kvm_device_ops *ops = NULL;
2663 struct kvm_device *dev;
2664 bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
2667 if (cd->type >= ARRAY_SIZE(kvm_device_ops_table))
2670 ops = kvm_device_ops_table[cd->type];
2677 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2684 ret = ops->create(dev, cd->type);
2690 ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC);
2696 list_add(&dev->vm_node, &kvm->devices);
2702 static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
2705 case KVM_CAP_USER_MEMORY:
2706 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2707 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2708 case KVM_CAP_INTERNAL_ERROR_DATA:
2709 #ifdef CONFIG_HAVE_KVM_MSI
2710 case KVM_CAP_SIGNAL_MSI:
2712 #ifdef CONFIG_HAVE_KVM_IRQFD
2714 case KVM_CAP_IRQFD_RESAMPLE:
2716 case KVM_CAP_IOEVENTFD_ANY_LENGTH:
2717 case KVM_CAP_CHECK_EXTENSION_VM:
2719 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2720 case KVM_CAP_IRQ_ROUTING:
2721 return KVM_MAX_IRQ_ROUTES;
2723 #if KVM_ADDRESS_SPACE_NUM > 1
2724 case KVM_CAP_MULTI_ADDRESS_SPACE:
2725 return KVM_ADDRESS_SPACE_NUM;
2730 return kvm_vm_ioctl_check_extension(kvm, arg);
2733 static long kvm_vm_ioctl(struct file *filp,
2734 unsigned int ioctl, unsigned long arg)
2736 struct kvm *kvm = filp->private_data;
2737 void __user *argp = (void __user *)arg;
2740 if (kvm->mm != current->mm)
2743 case KVM_CREATE_VCPU:
2744 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2746 case KVM_SET_USER_MEMORY_REGION: {
2747 struct kvm_userspace_memory_region kvm_userspace_mem;
2750 if (copy_from_user(&kvm_userspace_mem, argp,
2751 sizeof(kvm_userspace_mem)))
2754 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
2757 case KVM_GET_DIRTY_LOG: {
2758 struct kvm_dirty_log log;
2761 if (copy_from_user(&log, argp, sizeof(log)))
2763 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2766 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2767 case KVM_REGISTER_COALESCED_MMIO: {
2768 struct kvm_coalesced_mmio_zone zone;
2771 if (copy_from_user(&zone, argp, sizeof(zone)))
2773 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2776 case KVM_UNREGISTER_COALESCED_MMIO: {
2777 struct kvm_coalesced_mmio_zone zone;
2780 if (copy_from_user(&zone, argp, sizeof(zone)))
2782 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2787 struct kvm_irqfd data;
2790 if (copy_from_user(&data, argp, sizeof(data)))
2792 r = kvm_irqfd(kvm, &data);
2795 case KVM_IOEVENTFD: {
2796 struct kvm_ioeventfd data;
2799 if (copy_from_user(&data, argp, sizeof(data)))
2801 r = kvm_ioeventfd(kvm, &data);
2804 #ifdef CONFIG_HAVE_KVM_MSI
2805 case KVM_SIGNAL_MSI: {
2809 if (copy_from_user(&msi, argp, sizeof(msi)))
2811 r = kvm_send_userspace_msi(kvm, &msi);
2815 #ifdef __KVM_HAVE_IRQ_LINE
2816 case KVM_IRQ_LINE_STATUS:
2817 case KVM_IRQ_LINE: {
2818 struct kvm_irq_level irq_event;
2821 if (copy_from_user(&irq_event, argp, sizeof(irq_event)))
2824 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
2825 ioctl == KVM_IRQ_LINE_STATUS);
2830 if (ioctl == KVM_IRQ_LINE_STATUS) {
2831 if (copy_to_user(argp, &irq_event, sizeof(irq_event)))
2839 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2840 case KVM_SET_GSI_ROUTING: {
2841 struct kvm_irq_routing routing;
2842 struct kvm_irq_routing __user *urouting;
2843 struct kvm_irq_routing_entry *entries;
2846 if (copy_from_user(&routing, argp, sizeof(routing)))
2849 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
2854 entries = vmalloc(routing.nr * sizeof(*entries));
2859 if (copy_from_user(entries, urouting->entries,
2860 routing.nr * sizeof(*entries)))
2861 goto out_free_irq_routing;
2862 r = kvm_set_irq_routing(kvm, entries, routing.nr,
2864 out_free_irq_routing:
2868 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2869 case KVM_CREATE_DEVICE: {
2870 struct kvm_create_device cd;
2873 if (copy_from_user(&cd, argp, sizeof(cd)))
2876 r = kvm_ioctl_create_device(kvm, &cd);
2881 if (copy_to_user(argp, &cd, sizeof(cd)))
2887 case KVM_CHECK_EXTENSION:
2888 r = kvm_vm_ioctl_check_extension_generic(kvm, arg);
2891 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2897 #ifdef CONFIG_KVM_COMPAT
2898 struct compat_kvm_dirty_log {
2902 compat_uptr_t dirty_bitmap; /* one bit per page */
2907 static long kvm_vm_compat_ioctl(struct file *filp,
2908 unsigned int ioctl, unsigned long arg)
2910 struct kvm *kvm = filp->private_data;
2913 if (kvm->mm != current->mm)
2916 case KVM_GET_DIRTY_LOG: {
2917 struct compat_kvm_dirty_log compat_log;
2918 struct kvm_dirty_log log;
2921 if (copy_from_user(&compat_log, (void __user *)arg,
2922 sizeof(compat_log)))
2924 log.slot = compat_log.slot;
2925 log.padding1 = compat_log.padding1;
2926 log.padding2 = compat_log.padding2;
2927 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2929 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2933 r = kvm_vm_ioctl(filp, ioctl, arg);
2941 static struct file_operations kvm_vm_fops = {
2942 .release = kvm_vm_release,
2943 .unlocked_ioctl = kvm_vm_ioctl,
2944 #ifdef CONFIG_KVM_COMPAT
2945 .compat_ioctl = kvm_vm_compat_ioctl,
2947 .llseek = noop_llseek,
2950 static int kvm_dev_ioctl_create_vm(unsigned long type)
2955 kvm = kvm_create_vm(type);
2957 return PTR_ERR(kvm);
2958 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2959 r = kvm_coalesced_mmio_init(kvm);
2965 r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR | O_CLOEXEC);
2972 static long kvm_dev_ioctl(struct file *filp,
2973 unsigned int ioctl, unsigned long arg)
2978 case KVM_GET_API_VERSION:
2981 r = KVM_API_VERSION;
2984 r = kvm_dev_ioctl_create_vm(arg);
2986 case KVM_CHECK_EXTENSION:
2987 r = kvm_vm_ioctl_check_extension_generic(NULL, arg);
2989 case KVM_GET_VCPU_MMAP_SIZE:
2992 r = PAGE_SIZE; /* struct kvm_run */
2994 r += PAGE_SIZE; /* pio data page */
2996 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2997 r += PAGE_SIZE; /* coalesced mmio ring page */
3000 case KVM_TRACE_ENABLE:
3001 case KVM_TRACE_PAUSE:
3002 case KVM_TRACE_DISABLE:
3006 return kvm_arch_dev_ioctl(filp, ioctl, arg);
3012 static struct file_operations kvm_chardev_ops = {
3013 .unlocked_ioctl = kvm_dev_ioctl,
3014 .compat_ioctl = kvm_dev_ioctl,
3015 .llseek = noop_llseek,
3018 static struct miscdevice kvm_dev = {
3024 static void hardware_enable_nolock(void *junk)
3026 int cpu = raw_smp_processor_id();
3029 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
3032 cpumask_set_cpu(cpu, cpus_hardware_enabled);
3034 r = kvm_arch_hardware_enable();
3037 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3038 atomic_inc(&hardware_enable_failed);
3039 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu);
3043 static void hardware_enable(void)
3045 raw_spin_lock(&kvm_count_lock);
3046 if (kvm_usage_count)
3047 hardware_enable_nolock(NULL);
3048 raw_spin_unlock(&kvm_count_lock);
3051 static void hardware_disable_nolock(void *junk)
3053 int cpu = raw_smp_processor_id();
3055 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
3057 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3058 kvm_arch_hardware_disable();
3061 static void hardware_disable(void)
3063 raw_spin_lock(&kvm_count_lock);
3064 if (kvm_usage_count)
3065 hardware_disable_nolock(NULL);
3066 raw_spin_unlock(&kvm_count_lock);
3069 static void hardware_disable_all_nolock(void)
3071 BUG_ON(!kvm_usage_count);
3074 if (!kvm_usage_count)
3075 on_each_cpu(hardware_disable_nolock, NULL, 1);
3078 static void hardware_disable_all(void)
3080 raw_spin_lock(&kvm_count_lock);
3081 hardware_disable_all_nolock();
3082 raw_spin_unlock(&kvm_count_lock);
3085 static int hardware_enable_all(void)
3089 raw_spin_lock(&kvm_count_lock);
3092 if (kvm_usage_count == 1) {
3093 atomic_set(&hardware_enable_failed, 0);
3094 on_each_cpu(hardware_enable_nolock, NULL, 1);
3096 if (atomic_read(&hardware_enable_failed)) {
3097 hardware_disable_all_nolock();
3102 raw_spin_unlock(&kvm_count_lock);
3107 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
3110 val &= ~CPU_TASKS_FROZEN;
3122 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3126 * Some (well, at least mine) BIOSes hang on reboot if
3129 * And Intel TXT required VMX off for all cpu when system shutdown.
3131 pr_info("kvm: exiting hardware virtualization\n");
3132 kvm_rebooting = true;
3133 on_each_cpu(hardware_disable_nolock, NULL, 1);
3137 static struct notifier_block kvm_reboot_notifier = {
3138 .notifier_call = kvm_reboot,
3142 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3146 for (i = 0; i < bus->dev_count; i++) {
3147 struct kvm_io_device *pos = bus->range[i].dev;
3149 kvm_iodevice_destructor(pos);
3154 static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
3155 const struct kvm_io_range *r2)
3157 gpa_t addr1 = r1->addr;
3158 gpa_t addr2 = r2->addr;
3163 /* If r2->len == 0, match the exact address. If r2->len != 0,
3164 * accept any overlapping write. Any order is acceptable for
3165 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3166 * we process all of them.
3179 static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
3181 return kvm_io_bus_cmp(p1, p2);
3184 static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
3185 gpa_t addr, int len)
3187 bus->range[bus->dev_count++] = (struct kvm_io_range) {
3193 sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
3194 kvm_io_bus_sort_cmp, NULL);
3199 static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
3200 gpa_t addr, int len)
3202 struct kvm_io_range *range, key;
3205 key = (struct kvm_io_range) {
3210 range = bsearch(&key, bus->range, bus->dev_count,
3211 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
3215 off = range - bus->range;
3217 while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0)
3223 static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3224 struct kvm_io_range *range, const void *val)
3228 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3232 while (idx < bus->dev_count &&
3233 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3234 if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr,
3243 /* kvm_io_bus_write - called under kvm->slots_lock */
3244 int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3245 int len, const void *val)
3247 struct kvm_io_bus *bus;
3248 struct kvm_io_range range;
3251 range = (struct kvm_io_range) {
3256 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3257 r = __kvm_io_bus_write(vcpu, bus, &range, val);
3258 return r < 0 ? r : 0;
3261 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3262 int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
3263 gpa_t addr, int len, const void *val, long cookie)
3265 struct kvm_io_bus *bus;
3266 struct kvm_io_range range;
3268 range = (struct kvm_io_range) {
3273 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3275 /* First try the device referenced by cookie. */
3276 if ((cookie >= 0) && (cookie < bus->dev_count) &&
3277 (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
3278 if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len,
3283 * cookie contained garbage; fall back to search and return the
3284 * correct cookie value.
3286 return __kvm_io_bus_write(vcpu, bus, &range, val);
3289 static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3290 struct kvm_io_range *range, void *val)
3294 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3298 while (idx < bus->dev_count &&
3299 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3300 if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr,
3308 EXPORT_SYMBOL_GPL(kvm_io_bus_write);
3310 /* kvm_io_bus_read - called under kvm->slots_lock */
3311 int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3314 struct kvm_io_bus *bus;
3315 struct kvm_io_range range;
3318 range = (struct kvm_io_range) {
3323 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3324 r = __kvm_io_bus_read(vcpu, bus, &range, val);
3325 return r < 0 ? r : 0;
3329 /* Caller must hold slots_lock. */
3330 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
3331 int len, struct kvm_io_device *dev)
3333 struct kvm_io_bus *new_bus, *bus;
3335 bus = kvm->buses[bus_idx];
3336 /* exclude ioeventfd which is limited by maximum fd */
3337 if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
3340 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) *
3341 sizeof(struct kvm_io_range)), GFP_KERNEL);
3344 memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
3345 sizeof(struct kvm_io_range)));
3346 kvm_io_bus_insert_dev(new_bus, dev, addr, len);
3347 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3348 synchronize_srcu_expedited(&kvm->srcu);
3354 /* Caller must hold slots_lock. */
3355 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3356 struct kvm_io_device *dev)
3359 struct kvm_io_bus *new_bus, *bus;
3361 bus = kvm->buses[bus_idx];
3363 for (i = 0; i < bus->dev_count; i++)
3364 if (bus->range[i].dev == dev) {
3372 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) *
3373 sizeof(struct kvm_io_range)), GFP_KERNEL);
3377 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3378 new_bus->dev_count--;
3379 memcpy(new_bus->range + i, bus->range + i + 1,
3380 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
3382 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3383 synchronize_srcu_expedited(&kvm->srcu);
3388 static struct notifier_block kvm_cpu_notifier = {
3389 .notifier_call = kvm_cpu_hotplug,
3392 static int vm_stat_get(void *_offset, u64 *val)
3394 unsigned offset = (long)_offset;
3398 spin_lock(&kvm_lock);
3399 list_for_each_entry(kvm, &vm_list, vm_list)
3400 *val += *(u32 *)((void *)kvm + offset);
3401 spin_unlock(&kvm_lock);
3405 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
3407 static int vcpu_stat_get(void *_offset, u64 *val)
3409 unsigned offset = (long)_offset;
3411 struct kvm_vcpu *vcpu;
3415 spin_lock(&kvm_lock);
3416 list_for_each_entry(kvm, &vm_list, vm_list)
3417 kvm_for_each_vcpu(i, vcpu, kvm)
3418 *val += *(u32 *)((void *)vcpu + offset);
3420 spin_unlock(&kvm_lock);
3424 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
3426 static const struct file_operations *stat_fops[] = {
3427 [KVM_STAT_VCPU] = &vcpu_stat_fops,
3428 [KVM_STAT_VM] = &vm_stat_fops,
3431 static int kvm_init_debug(void)
3434 struct kvm_stats_debugfs_item *p;
3436 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
3437 if (kvm_debugfs_dir == NULL)
3440 for (p = debugfs_entries; p->name; ++p) {
3441 if (!debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
3442 (void *)(long)p->offset,
3443 stat_fops[p->kind]))
3450 debugfs_remove_recursive(kvm_debugfs_dir);
3455 static int kvm_suspend(void)
3457 if (kvm_usage_count)
3458 hardware_disable_nolock(NULL);
3462 static void kvm_resume(void)
3464 if (kvm_usage_count) {
3465 WARN_ON(raw_spin_is_locked(&kvm_count_lock));
3466 hardware_enable_nolock(NULL);
3470 static struct syscore_ops kvm_syscore_ops = {
3471 .suspend = kvm_suspend,
3472 .resume = kvm_resume,
3476 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3478 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3481 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3483 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3485 if (vcpu->preempted)
3486 vcpu->preempted = false;
3488 kvm_arch_sched_in(vcpu, cpu);
3490 kvm_arch_vcpu_load(vcpu, cpu);
3493 static void kvm_sched_out(struct preempt_notifier *pn,
3494 struct task_struct *next)
3496 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3498 if (current->state == TASK_RUNNING)
3499 vcpu->preempted = true;
3500 kvm_arch_vcpu_put(vcpu);
3503 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
3504 struct module *module)
3509 r = kvm_arch_init(opaque);
3514 * kvm_arch_init makes sure there's at most one caller
3515 * for architectures that support multiple implementations,
3516 * like intel and amd on x86.
3517 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3518 * conflicts in case kvm is already setup for another implementation.
3520 r = kvm_irqfd_init();
3524 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
3529 r = kvm_arch_hardware_setup();
3533 for_each_online_cpu(cpu) {
3534 smp_call_function_single(cpu,
3535 kvm_arch_check_processor_compat,
3541 r = register_cpu_notifier(&kvm_cpu_notifier);
3544 register_reboot_notifier(&kvm_reboot_notifier);
3546 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3548 vcpu_align = __alignof__(struct kvm_vcpu);
3549 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
3551 if (!kvm_vcpu_cache) {
3556 r = kvm_async_pf_init();
3560 kvm_chardev_ops.owner = module;
3561 kvm_vm_fops.owner = module;
3562 kvm_vcpu_fops.owner = module;
3564 r = misc_register(&kvm_dev);
3566 pr_err("kvm: misc device register failed\n");
3570 register_syscore_ops(&kvm_syscore_ops);
3572 kvm_preempt_ops.sched_in = kvm_sched_in;
3573 kvm_preempt_ops.sched_out = kvm_sched_out;
3575 r = kvm_init_debug();
3577 pr_err("kvm: create debugfs files failed\n");
3581 r = kvm_vfio_ops_init();
3587 unregister_syscore_ops(&kvm_syscore_ops);
3588 misc_deregister(&kvm_dev);
3590 kvm_async_pf_deinit();
3592 kmem_cache_destroy(kvm_vcpu_cache);
3594 unregister_reboot_notifier(&kvm_reboot_notifier);
3595 unregister_cpu_notifier(&kvm_cpu_notifier);
3598 kvm_arch_hardware_unsetup();
3600 free_cpumask_var(cpus_hardware_enabled);
3608 EXPORT_SYMBOL_GPL(kvm_init);
3612 debugfs_remove_recursive(kvm_debugfs_dir);
3613 misc_deregister(&kvm_dev);
3614 kmem_cache_destroy(kvm_vcpu_cache);
3615 kvm_async_pf_deinit();
3616 unregister_syscore_ops(&kvm_syscore_ops);
3617 unregister_reboot_notifier(&kvm_reboot_notifier);
3618 unregister_cpu_notifier(&kvm_cpu_notifier);
3619 on_each_cpu(hardware_disable_nolock, NULL, 1);
3620 kvm_arch_hardware_unsetup();
3623 free_cpumask_var(cpus_hardware_enabled);
3624 kvm_vfio_ops_exit();
3626 EXPORT_SYMBOL_GPL(kvm_exit);