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 <linux/uaccess.h>
57 #include <asm/pgtable.h>
59 #include "coalesced_mmio.h"
63 #define CREATE_TRACE_POINTS
64 #include <trace/events/kvm.h>
66 /* Worst case buffer size needed for holding an integer. */
67 #define ITOA_MAX_LEN 12
69 MODULE_AUTHOR("Qumranet");
70 MODULE_LICENSE("GPL");
72 /* Architectures should define their poll value according to the halt latency */
73 unsigned int halt_poll_ns
= KVM_HALT_POLL_NS_DEFAULT
;
74 module_param(halt_poll_ns
, uint
, S_IRUGO
| S_IWUSR
);
75 EXPORT_SYMBOL_GPL(halt_poll_ns
);
77 /* Default doubles per-vcpu halt_poll_ns. */
78 unsigned int halt_poll_ns_grow
= 2;
79 module_param(halt_poll_ns_grow
, uint
, S_IRUGO
| S_IWUSR
);
80 EXPORT_SYMBOL_GPL(halt_poll_ns_grow
);
82 /* Default resets per-vcpu halt_poll_ns . */
83 unsigned int halt_poll_ns_shrink
;
84 module_param(halt_poll_ns_shrink
, uint
, S_IRUGO
| S_IWUSR
);
85 EXPORT_SYMBOL_GPL(halt_poll_ns_shrink
);
90 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
93 DEFINE_SPINLOCK(kvm_lock
);
94 static DEFINE_RAW_SPINLOCK(kvm_count_lock
);
97 static cpumask_var_t cpus_hardware_enabled
;
98 static int kvm_usage_count
;
99 static atomic_t hardware_enable_failed
;
101 struct kmem_cache
*kvm_vcpu_cache
;
102 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
104 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
106 struct dentry
*kvm_debugfs_dir
;
107 EXPORT_SYMBOL_GPL(kvm_debugfs_dir
);
109 static int kvm_debugfs_num_entries
;
110 static const struct file_operations
*stat_fops_per_vm
[];
112 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
114 #ifdef CONFIG_KVM_COMPAT
115 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
118 static int hardware_enable_all(void);
119 static void hardware_disable_all(void);
121 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
123 static void kvm_release_pfn_dirty(kvm_pfn_t pfn
);
124 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
, gfn_t gfn
);
126 __visible
bool kvm_rebooting
;
127 EXPORT_SYMBOL_GPL(kvm_rebooting
);
129 static bool largepages_enabled
= true;
131 bool kvm_is_reserved_pfn(kvm_pfn_t pfn
)
134 return PageReserved(pfn_to_page(pfn
));
140 * Switches to specified vcpu, until a matching vcpu_put()
142 int vcpu_load(struct kvm_vcpu
*vcpu
)
146 if (mutex_lock_killable(&vcpu
->mutex
))
149 preempt_notifier_register(&vcpu
->preempt_notifier
);
150 kvm_arch_vcpu_load(vcpu
, cpu
);
154 EXPORT_SYMBOL_GPL(vcpu_load
);
156 void vcpu_put(struct kvm_vcpu
*vcpu
)
159 kvm_arch_vcpu_put(vcpu
);
160 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
162 mutex_unlock(&vcpu
->mutex
);
164 EXPORT_SYMBOL_GPL(vcpu_put
);
166 static void ack_flush(void *_completed
)
170 bool kvm_make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
175 struct kvm_vcpu
*vcpu
;
177 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
180 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
181 kvm_make_request(req
, vcpu
);
184 /* Set ->requests bit before we read ->mode. */
185 smp_mb__after_atomic();
187 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
188 kvm_vcpu_exiting_guest_mode(vcpu
) != OUTSIDE_GUEST_MODE
)
189 cpumask_set_cpu(cpu
, cpus
);
191 if (unlikely(cpus
== NULL
))
192 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
193 else if (!cpumask_empty(cpus
))
194 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
198 free_cpumask_var(cpus
);
202 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
203 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
206 * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
207 * kvm_make_all_cpus_request.
209 long dirty_count
= smp_load_acquire(&kvm
->tlbs_dirty
);
212 * We want to publish modifications to the page tables before reading
213 * mode. Pairs with a memory barrier in arch-specific code.
214 * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest
215 * and smp_mb in walk_shadow_page_lockless_begin/end.
216 * - powerpc: smp_mb in kvmppc_prepare_to_enter.
218 * There is already an smp_mb__after_atomic() before
219 * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
222 if (kvm_make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
223 ++kvm
->stat
.remote_tlb_flush
;
224 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
226 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs
);
229 void kvm_reload_remote_mmus(struct kvm
*kvm
)
231 kvm_make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
234 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
239 mutex_init(&vcpu
->mutex
);
244 init_swait_queue_head(&vcpu
->wq
);
245 kvm_async_pf_vcpu_init(vcpu
);
248 INIT_LIST_HEAD(&vcpu
->blocked_vcpu_list
);
250 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
255 vcpu
->run
= page_address(page
);
257 kvm_vcpu_set_in_spin_loop(vcpu
, false);
258 kvm_vcpu_set_dy_eligible(vcpu
, false);
259 vcpu
->preempted
= false;
261 r
= kvm_arch_vcpu_init(vcpu
);
267 free_page((unsigned long)vcpu
->run
);
271 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
273 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
276 kvm_arch_vcpu_uninit(vcpu
);
277 free_page((unsigned long)vcpu
->run
);
279 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
281 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
282 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
284 return container_of(mn
, struct kvm
, mmu_notifier
);
287 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
288 struct mm_struct
*mm
,
289 unsigned long address
)
291 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
292 int need_tlb_flush
, idx
;
295 * When ->invalidate_page runs, the linux pte has been zapped
296 * already but the page is still allocated until
297 * ->invalidate_page returns. So if we increase the sequence
298 * here the kvm page fault will notice if the spte can't be
299 * established because the page is going to be freed. If
300 * instead the kvm page fault establishes the spte before
301 * ->invalidate_page runs, kvm_unmap_hva will release it
304 * The sequence increase only need to be seen at spin_unlock
305 * time, and not at spin_lock time.
307 * Increasing the sequence after the spin_unlock would be
308 * unsafe because the kvm page fault could then establish the
309 * pte after kvm_unmap_hva returned, without noticing the page
310 * is going to be freed.
312 idx
= srcu_read_lock(&kvm
->srcu
);
313 spin_lock(&kvm
->mmu_lock
);
315 kvm
->mmu_notifier_seq
++;
316 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
317 /* we've to flush the tlb before the pages can be freed */
319 kvm_flush_remote_tlbs(kvm
);
321 spin_unlock(&kvm
->mmu_lock
);
323 kvm_arch_mmu_notifier_invalidate_page(kvm
, address
);
325 srcu_read_unlock(&kvm
->srcu
, idx
);
328 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
329 struct mm_struct
*mm
,
330 unsigned long address
,
333 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
336 idx
= srcu_read_lock(&kvm
->srcu
);
337 spin_lock(&kvm
->mmu_lock
);
338 kvm
->mmu_notifier_seq
++;
339 kvm_set_spte_hva(kvm
, address
, pte
);
340 spin_unlock(&kvm
->mmu_lock
);
341 srcu_read_unlock(&kvm
->srcu
, idx
);
344 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
345 struct mm_struct
*mm
,
349 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
350 int need_tlb_flush
= 0, idx
;
352 idx
= srcu_read_lock(&kvm
->srcu
);
353 spin_lock(&kvm
->mmu_lock
);
355 * The count increase must become visible at unlock time as no
356 * spte can be established without taking the mmu_lock and
357 * count is also read inside the mmu_lock critical section.
359 kvm
->mmu_notifier_count
++;
360 need_tlb_flush
= kvm_unmap_hva_range(kvm
, start
, end
);
361 need_tlb_flush
|= kvm
->tlbs_dirty
;
362 /* we've to flush the tlb before the pages can be freed */
364 kvm_flush_remote_tlbs(kvm
);
366 spin_unlock(&kvm
->mmu_lock
);
367 srcu_read_unlock(&kvm
->srcu
, idx
);
370 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
371 struct mm_struct
*mm
,
375 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
377 spin_lock(&kvm
->mmu_lock
);
379 * This sequence increase will notify the kvm page fault that
380 * the page that is going to be mapped in the spte could have
383 kvm
->mmu_notifier_seq
++;
386 * The above sequence increase must be visible before the
387 * below count decrease, which is ensured by the smp_wmb above
388 * in conjunction with the smp_rmb in mmu_notifier_retry().
390 kvm
->mmu_notifier_count
--;
391 spin_unlock(&kvm
->mmu_lock
);
393 BUG_ON(kvm
->mmu_notifier_count
< 0);
396 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
397 struct mm_struct
*mm
,
401 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
404 idx
= srcu_read_lock(&kvm
->srcu
);
405 spin_lock(&kvm
->mmu_lock
);
407 young
= kvm_age_hva(kvm
, start
, end
);
409 kvm_flush_remote_tlbs(kvm
);
411 spin_unlock(&kvm
->mmu_lock
);
412 srcu_read_unlock(&kvm
->srcu
, idx
);
417 static int kvm_mmu_notifier_clear_young(struct mmu_notifier
*mn
,
418 struct mm_struct
*mm
,
422 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
425 idx
= srcu_read_lock(&kvm
->srcu
);
426 spin_lock(&kvm
->mmu_lock
);
428 * Even though we do not flush TLB, this will still adversely
429 * affect performance on pre-Haswell Intel EPT, where there is
430 * no EPT Access Bit to clear so that we have to tear down EPT
431 * tables instead. If we find this unacceptable, we can always
432 * add a parameter to kvm_age_hva so that it effectively doesn't
433 * do anything on clear_young.
435 * Also note that currently we never issue secondary TLB flushes
436 * from clear_young, leaving this job up to the regular system
437 * cadence. If we find this inaccurate, we might come up with a
438 * more sophisticated heuristic later.
440 young
= kvm_age_hva(kvm
, start
, end
);
441 spin_unlock(&kvm
->mmu_lock
);
442 srcu_read_unlock(&kvm
->srcu
, idx
);
447 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
448 struct mm_struct
*mm
,
449 unsigned long address
)
451 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
454 idx
= srcu_read_lock(&kvm
->srcu
);
455 spin_lock(&kvm
->mmu_lock
);
456 young
= kvm_test_age_hva(kvm
, address
);
457 spin_unlock(&kvm
->mmu_lock
);
458 srcu_read_unlock(&kvm
->srcu
, idx
);
463 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
464 struct mm_struct
*mm
)
466 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
469 idx
= srcu_read_lock(&kvm
->srcu
);
470 kvm_arch_flush_shadow_all(kvm
);
471 srcu_read_unlock(&kvm
->srcu
, idx
);
474 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
475 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
476 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
477 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
478 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
479 .clear_young
= kvm_mmu_notifier_clear_young
,
480 .test_young
= kvm_mmu_notifier_test_young
,
481 .change_pte
= kvm_mmu_notifier_change_pte
,
482 .release
= kvm_mmu_notifier_release
,
485 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
487 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
488 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
491 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
493 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
498 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
500 static struct kvm_memslots
*kvm_alloc_memslots(void)
503 struct kvm_memslots
*slots
;
505 slots
= kvm_kvzalloc(sizeof(struct kvm_memslots
));
510 * Init kvm generation close to the maximum to easily test the
511 * code of handling generation number wrap-around.
513 slots
->generation
= -150;
514 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
515 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
520 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
522 if (!memslot
->dirty_bitmap
)
525 kvfree(memslot
->dirty_bitmap
);
526 memslot
->dirty_bitmap
= NULL
;
530 * Free any memory in @free but not in @dont.
532 static void kvm_free_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
533 struct kvm_memory_slot
*dont
)
535 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
536 kvm_destroy_dirty_bitmap(free
);
538 kvm_arch_free_memslot(kvm
, free
, dont
);
543 static void kvm_free_memslots(struct kvm
*kvm
, struct kvm_memslots
*slots
)
545 struct kvm_memory_slot
*memslot
;
550 kvm_for_each_memslot(memslot
, slots
)
551 kvm_free_memslot(kvm
, memslot
, NULL
);
556 static void kvm_destroy_vm_debugfs(struct kvm
*kvm
)
560 if (!kvm
->debugfs_dentry
)
563 debugfs_remove_recursive(kvm
->debugfs_dentry
);
565 if (kvm
->debugfs_stat_data
) {
566 for (i
= 0; i
< kvm_debugfs_num_entries
; i
++)
567 kfree(kvm
->debugfs_stat_data
[i
]);
568 kfree(kvm
->debugfs_stat_data
);
572 static int kvm_create_vm_debugfs(struct kvm
*kvm
, int fd
)
574 char dir_name
[ITOA_MAX_LEN
* 2];
575 struct kvm_stat_data
*stat_data
;
576 struct kvm_stats_debugfs_item
*p
;
578 if (!debugfs_initialized())
581 snprintf(dir_name
, sizeof(dir_name
), "%d-%d", task_pid_nr(current
), fd
);
582 kvm
->debugfs_dentry
= debugfs_create_dir(dir_name
,
584 if (!kvm
->debugfs_dentry
)
587 kvm
->debugfs_stat_data
= kcalloc(kvm_debugfs_num_entries
,
588 sizeof(*kvm
->debugfs_stat_data
),
590 if (!kvm
->debugfs_stat_data
)
593 for (p
= debugfs_entries
; p
->name
; p
++) {
594 stat_data
= kzalloc(sizeof(*stat_data
), GFP_KERNEL
);
598 stat_data
->kvm
= kvm
;
599 stat_data
->offset
= p
->offset
;
600 kvm
->debugfs_stat_data
[p
- debugfs_entries
] = stat_data
;
601 if (!debugfs_create_file(p
->name
, 0644,
604 stat_fops_per_vm
[p
->kind
]))
610 static struct kvm
*kvm_create_vm(unsigned long type
)
613 struct kvm
*kvm
= kvm_arch_alloc_vm();
616 return ERR_PTR(-ENOMEM
);
618 spin_lock_init(&kvm
->mmu_lock
);
619 atomic_inc(¤t
->mm
->mm_count
);
620 kvm
->mm
= current
->mm
;
621 kvm_eventfd_init(kvm
);
622 mutex_init(&kvm
->lock
);
623 mutex_init(&kvm
->irq_lock
);
624 mutex_init(&kvm
->slots_lock
);
625 atomic_set(&kvm
->users_count
, 1);
626 INIT_LIST_HEAD(&kvm
->devices
);
628 r
= kvm_arch_init_vm(kvm
, type
);
630 goto out_err_no_disable
;
632 r
= hardware_enable_all();
634 goto out_err_no_disable
;
636 #ifdef CONFIG_HAVE_KVM_IRQFD
637 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
640 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
643 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++) {
644 kvm
->memslots
[i
] = kvm_alloc_memslots();
645 if (!kvm
->memslots
[i
])
646 goto out_err_no_srcu
;
649 if (init_srcu_struct(&kvm
->srcu
))
650 goto out_err_no_srcu
;
651 if (init_srcu_struct(&kvm
->irq_srcu
))
652 goto out_err_no_irq_srcu
;
653 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
654 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
660 r
= kvm_init_mmu_notifier(kvm
);
664 spin_lock(&kvm_lock
);
665 list_add(&kvm
->vm_list
, &vm_list
);
666 spin_unlock(&kvm_lock
);
668 preempt_notifier_inc();
673 cleanup_srcu_struct(&kvm
->irq_srcu
);
675 cleanup_srcu_struct(&kvm
->srcu
);
677 hardware_disable_all();
679 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
680 kfree(kvm
->buses
[i
]);
681 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
682 kvm_free_memslots(kvm
, kvm
->memslots
[i
]);
683 kvm_arch_free_vm(kvm
);
689 * Avoid using vmalloc for a small buffer.
690 * Should not be used when the size is statically known.
692 void *kvm_kvzalloc(unsigned long size
)
694 if (size
> PAGE_SIZE
)
695 return vzalloc(size
);
697 return kzalloc(size
, GFP_KERNEL
);
700 static void kvm_destroy_devices(struct kvm
*kvm
)
702 struct kvm_device
*dev
, *tmp
;
705 * We do not need to take the kvm->lock here, because nobody else
706 * has a reference to the struct kvm at this point and therefore
707 * cannot access the devices list anyhow.
709 list_for_each_entry_safe(dev
, tmp
, &kvm
->devices
, vm_node
) {
710 list_del(&dev
->vm_node
);
711 dev
->ops
->destroy(dev
);
715 static void kvm_destroy_vm(struct kvm
*kvm
)
718 struct mm_struct
*mm
= kvm
->mm
;
720 kvm_destroy_vm_debugfs(kvm
);
721 kvm_arch_sync_events(kvm
);
722 spin_lock(&kvm_lock
);
723 list_del(&kvm
->vm_list
);
724 spin_unlock(&kvm_lock
);
725 kvm_free_irq_routing(kvm
);
726 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
728 kvm_io_bus_destroy(kvm
->buses
[i
]);
729 kvm
->buses
[i
] = NULL
;
731 kvm_coalesced_mmio_free(kvm
);
732 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
733 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
735 kvm_arch_flush_shadow_all(kvm
);
737 kvm_arch_destroy_vm(kvm
);
738 kvm_destroy_devices(kvm
);
739 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
740 kvm_free_memslots(kvm
, kvm
->memslots
[i
]);
741 cleanup_srcu_struct(&kvm
->irq_srcu
);
742 cleanup_srcu_struct(&kvm
->srcu
);
743 kvm_arch_free_vm(kvm
);
744 preempt_notifier_dec();
745 hardware_disable_all();
749 void kvm_get_kvm(struct kvm
*kvm
)
751 atomic_inc(&kvm
->users_count
);
753 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
755 void kvm_put_kvm(struct kvm
*kvm
)
757 if (atomic_dec_and_test(&kvm
->users_count
))
760 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
763 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
765 struct kvm
*kvm
= filp
->private_data
;
767 kvm_irqfd_release(kvm
);
774 * Allocation size is twice as large as the actual dirty bitmap size.
775 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
777 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
779 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
781 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
782 if (!memslot
->dirty_bitmap
)
789 * Insert memslot and re-sort memslots based on their GFN,
790 * so binary search could be used to lookup GFN.
791 * Sorting algorithm takes advantage of having initially
792 * sorted array and known changed memslot position.
794 static void update_memslots(struct kvm_memslots
*slots
,
795 struct kvm_memory_slot
*new)
798 int i
= slots
->id_to_index
[id
];
799 struct kvm_memory_slot
*mslots
= slots
->memslots
;
801 WARN_ON(mslots
[i
].id
!= id
);
803 WARN_ON(!mslots
[i
].npages
);
804 if (mslots
[i
].npages
)
807 if (!mslots
[i
].npages
)
811 while (i
< KVM_MEM_SLOTS_NUM
- 1 &&
812 new->base_gfn
<= mslots
[i
+ 1].base_gfn
) {
813 if (!mslots
[i
+ 1].npages
)
815 mslots
[i
] = mslots
[i
+ 1];
816 slots
->id_to_index
[mslots
[i
].id
] = i
;
821 * The ">=" is needed when creating a slot with base_gfn == 0,
822 * so that it moves before all those with base_gfn == npages == 0.
824 * On the other hand, if new->npages is zero, the above loop has
825 * already left i pointing to the beginning of the empty part of
826 * mslots, and the ">=" would move the hole backwards in this
827 * case---which is wrong. So skip the loop when deleting a slot.
831 new->base_gfn
>= mslots
[i
- 1].base_gfn
) {
832 mslots
[i
] = mslots
[i
- 1];
833 slots
->id_to_index
[mslots
[i
].id
] = i
;
837 WARN_ON_ONCE(i
!= slots
->used_slots
);
840 slots
->id_to_index
[mslots
[i
].id
] = i
;
843 static int check_memory_region_flags(const struct kvm_userspace_memory_region
*mem
)
845 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
847 #ifdef __KVM_HAVE_READONLY_MEM
848 valid_flags
|= KVM_MEM_READONLY
;
851 if (mem
->flags
& ~valid_flags
)
857 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
858 int as_id
, struct kvm_memslots
*slots
)
860 struct kvm_memslots
*old_memslots
= __kvm_memslots(kvm
, as_id
);
863 * Set the low bit in the generation, which disables SPTE caching
864 * until the end of synchronize_srcu_expedited.
866 WARN_ON(old_memslots
->generation
& 1);
867 slots
->generation
= old_memslots
->generation
+ 1;
869 rcu_assign_pointer(kvm
->memslots
[as_id
], slots
);
870 synchronize_srcu_expedited(&kvm
->srcu
);
873 * Increment the new memslot generation a second time. This prevents
874 * vm exits that race with memslot updates from caching a memslot
875 * generation that will (potentially) be valid forever.
879 kvm_arch_memslots_updated(kvm
, slots
);
885 * Allocate some memory and give it an address in the guest physical address
888 * Discontiguous memory is allowed, mostly for framebuffers.
890 * Must be called holding kvm->slots_lock for write.
892 int __kvm_set_memory_region(struct kvm
*kvm
,
893 const struct kvm_userspace_memory_region
*mem
)
897 unsigned long npages
;
898 struct kvm_memory_slot
*slot
;
899 struct kvm_memory_slot old
, new;
900 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
902 enum kvm_mr_change change
;
904 r
= check_memory_region_flags(mem
);
909 as_id
= mem
->slot
>> 16;
912 /* General sanity checks */
913 if (mem
->memory_size
& (PAGE_SIZE
- 1))
915 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
917 /* We can read the guest memory with __xxx_user() later on. */
918 if ((id
< KVM_USER_MEM_SLOTS
) &&
919 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
920 !access_ok(VERIFY_WRITE
,
921 (void __user
*)(unsigned long)mem
->userspace_addr
,
924 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_MEM_SLOTS_NUM
)
926 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
929 slot
= id_to_memslot(__kvm_memslots(kvm
, as_id
), id
);
930 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
931 npages
= mem
->memory_size
>> PAGE_SHIFT
;
933 if (npages
> KVM_MEM_MAX_NR_PAGES
)
939 new.base_gfn
= base_gfn
;
941 new.flags
= mem
->flags
;
945 change
= KVM_MR_CREATE
;
946 else { /* Modify an existing slot. */
947 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
948 (npages
!= old
.npages
) ||
949 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
952 if (base_gfn
!= old
.base_gfn
)
953 change
= KVM_MR_MOVE
;
954 else if (new.flags
!= old
.flags
)
955 change
= KVM_MR_FLAGS_ONLY
;
956 else { /* Nothing to change. */
965 change
= KVM_MR_DELETE
;
970 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
971 /* Check for overlaps */
973 kvm_for_each_memslot(slot
, __kvm_memslots(kvm
, as_id
)) {
974 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
977 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
978 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
983 /* Free page dirty bitmap if unneeded */
984 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
985 new.dirty_bitmap
= NULL
;
988 if (change
== KVM_MR_CREATE
) {
989 new.userspace_addr
= mem
->userspace_addr
;
991 if (kvm_arch_create_memslot(kvm
, &new, npages
))
995 /* Allocate page dirty bitmap if needed */
996 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
997 if (kvm_create_dirty_bitmap(&new) < 0)
1001 slots
= kvm_kvzalloc(sizeof(struct kvm_memslots
));
1004 memcpy(slots
, __kvm_memslots(kvm
, as_id
), sizeof(struct kvm_memslots
));
1006 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
1007 slot
= id_to_memslot(slots
, id
);
1008 slot
->flags
|= KVM_MEMSLOT_INVALID
;
1010 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
1012 /* slot was deleted or moved, clear iommu mapping */
1013 kvm_iommu_unmap_pages(kvm
, &old
);
1014 /* From this point no new shadow pages pointing to a deleted,
1015 * or moved, memslot will be created.
1017 * validation of sp->gfn happens in:
1018 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
1019 * - kvm_is_visible_gfn (mmu_check_roots)
1021 kvm_arch_flush_shadow_memslot(kvm
, slot
);
1024 * We can re-use the old_memslots from above, the only difference
1025 * from the currently installed memslots is the invalid flag. This
1026 * will get overwritten by update_memslots anyway.
1028 slots
= old_memslots
;
1031 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
1035 /* actual memory is freed via old in kvm_free_memslot below */
1036 if (change
== KVM_MR_DELETE
) {
1037 new.dirty_bitmap
= NULL
;
1038 memset(&new.arch
, 0, sizeof(new.arch
));
1041 update_memslots(slots
, &new);
1042 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
1044 kvm_arch_commit_memory_region(kvm
, mem
, &old
, &new, change
);
1046 kvm_free_memslot(kvm
, &old
, &new);
1047 kvfree(old_memslots
);
1050 * IOMMU mapping: New slots need to be mapped. Old slots need to be
1051 * un-mapped and re-mapped if their base changes. Since base change
1052 * unmapping is handled above with slot deletion, mapping alone is
1053 * needed here. Anything else the iommu might care about for existing
1054 * slots (size changes, userspace addr changes and read-only flag
1055 * changes) is disallowed above, so any other attribute changes getting
1056 * here can be skipped.
1058 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
1059 r
= kvm_iommu_map_pages(kvm
, &new);
1068 kvm_free_memslot(kvm
, &new, &old
);
1072 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
1074 int kvm_set_memory_region(struct kvm
*kvm
,
1075 const struct kvm_userspace_memory_region
*mem
)
1079 mutex_lock(&kvm
->slots_lock
);
1080 r
= __kvm_set_memory_region(kvm
, mem
);
1081 mutex_unlock(&kvm
->slots_lock
);
1084 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
1086 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
1087 struct kvm_userspace_memory_region
*mem
)
1089 if ((u16
)mem
->slot
>= KVM_USER_MEM_SLOTS
)
1092 return kvm_set_memory_region(kvm
, mem
);
1095 int kvm_get_dirty_log(struct kvm
*kvm
,
1096 struct kvm_dirty_log
*log
, int *is_dirty
)
1098 struct kvm_memslots
*slots
;
1099 struct kvm_memory_slot
*memslot
;
1100 int r
, i
, as_id
, id
;
1102 unsigned long any
= 0;
1105 as_id
= log
->slot
>> 16;
1106 id
= (u16
)log
->slot
;
1107 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1110 slots
= __kvm_memslots(kvm
, as_id
);
1111 memslot
= id_to_memslot(slots
, id
);
1113 if (!memslot
->dirty_bitmap
)
1116 n
= kvm_dirty_bitmap_bytes(memslot
);
1118 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
1119 any
= memslot
->dirty_bitmap
[i
];
1122 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
1132 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
1134 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1136 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1137 * are dirty write protect them for next write.
1138 * @kvm: pointer to kvm instance
1139 * @log: slot id and address to which we copy the log
1140 * @is_dirty: flag set if any page is dirty
1142 * We need to keep it in mind that VCPU threads can write to the bitmap
1143 * concurrently. So, to avoid losing track of dirty pages we keep the
1146 * 1. Take a snapshot of the bit and clear it if needed.
1147 * 2. Write protect the corresponding page.
1148 * 3. Copy the snapshot to the userspace.
1149 * 4. Upon return caller flushes TLB's if needed.
1151 * Between 2 and 4, the guest may write to the page using the remaining TLB
1152 * entry. This is not a problem because the page is reported dirty using
1153 * the snapshot taken before and step 4 ensures that writes done after
1154 * exiting to userspace will be logged for the next call.
1157 int kvm_get_dirty_log_protect(struct kvm
*kvm
,
1158 struct kvm_dirty_log
*log
, bool *is_dirty
)
1160 struct kvm_memslots
*slots
;
1161 struct kvm_memory_slot
*memslot
;
1162 int r
, i
, as_id
, id
;
1164 unsigned long *dirty_bitmap
;
1165 unsigned long *dirty_bitmap_buffer
;
1168 as_id
= log
->slot
>> 16;
1169 id
= (u16
)log
->slot
;
1170 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1173 slots
= __kvm_memslots(kvm
, as_id
);
1174 memslot
= id_to_memslot(slots
, id
);
1176 dirty_bitmap
= memslot
->dirty_bitmap
;
1181 n
= kvm_dirty_bitmap_bytes(memslot
);
1183 dirty_bitmap_buffer
= dirty_bitmap
+ n
/ sizeof(long);
1184 memset(dirty_bitmap_buffer
, 0, n
);
1186 spin_lock(&kvm
->mmu_lock
);
1188 for (i
= 0; i
< n
/ sizeof(long); i
++) {
1192 if (!dirty_bitmap
[i
])
1197 mask
= xchg(&dirty_bitmap
[i
], 0);
1198 dirty_bitmap_buffer
[i
] = mask
;
1201 offset
= i
* BITS_PER_LONG
;
1202 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
,
1207 spin_unlock(&kvm
->mmu_lock
);
1210 if (copy_to_user(log
->dirty_bitmap
, dirty_bitmap_buffer
, n
))
1217 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect
);
1220 bool kvm_largepages_enabled(void)
1222 return largepages_enabled
;
1225 void kvm_disable_largepages(void)
1227 largepages_enabled
= false;
1229 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
1231 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1233 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1235 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1237 struct kvm_memory_slot
*kvm_vcpu_gfn_to_memslot(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1239 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu
), gfn
);
1242 bool kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1244 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1246 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1247 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1252 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1254 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1256 struct vm_area_struct
*vma
;
1257 unsigned long addr
, size
;
1261 addr
= gfn_to_hva(kvm
, gfn
);
1262 if (kvm_is_error_hva(addr
))
1265 down_read(¤t
->mm
->mmap_sem
);
1266 vma
= find_vma(current
->mm
, addr
);
1270 size
= vma_kernel_pagesize(vma
);
1273 up_read(¤t
->mm
->mmap_sem
);
1278 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1280 return slot
->flags
& KVM_MEM_READONLY
;
1283 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1284 gfn_t
*nr_pages
, bool write
)
1286 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1287 return KVM_HVA_ERR_BAD
;
1289 if (memslot_is_readonly(slot
) && write
)
1290 return KVM_HVA_ERR_RO_BAD
;
1293 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1295 return __gfn_to_hva_memslot(slot
, gfn
);
1298 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1301 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1304 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1307 return gfn_to_hva_many(slot
, gfn
, NULL
);
1309 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1311 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1313 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1315 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1317 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1319 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
, NULL
);
1321 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva
);
1324 * If writable is set to false, the hva returned by this function is only
1325 * allowed to be read.
1327 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot
*slot
,
1328 gfn_t gfn
, bool *writable
)
1330 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1332 if (!kvm_is_error_hva(hva
) && writable
)
1333 *writable
= !memslot_is_readonly(slot
);
1338 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1340 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1342 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1345 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu
*vcpu
, gfn_t gfn
, bool *writable
)
1347 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1349 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1352 static int get_user_page_nowait(unsigned long start
, int write
,
1355 int flags
= FOLL_NOWAIT
| FOLL_HWPOISON
;
1358 flags
|= FOLL_WRITE
;
1360 return get_user_pages(start
, 1, flags
, page
, NULL
);
1363 static inline int check_user_page_hwpoison(unsigned long addr
)
1365 int rc
, flags
= FOLL_HWPOISON
| FOLL_WRITE
;
1367 rc
= get_user_pages(addr
, 1, flags
, NULL
, NULL
);
1368 return rc
== -EHWPOISON
;
1372 * The atomic path to get the writable pfn which will be stored in @pfn,
1373 * true indicates success, otherwise false is returned.
1375 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1376 bool write_fault
, bool *writable
, kvm_pfn_t
*pfn
)
1378 struct page
*page
[1];
1381 if (!(async
|| atomic
))
1385 * Fast pin a writable pfn only if it is a write fault request
1386 * or the caller allows to map a writable pfn for a read fault
1389 if (!(write_fault
|| writable
))
1392 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1394 *pfn
= page_to_pfn(page
[0]);
1405 * The slow path to get the pfn of the specified host virtual address,
1406 * 1 indicates success, -errno is returned if error is detected.
1408 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1409 bool *writable
, kvm_pfn_t
*pfn
)
1411 struct page
*page
[1];
1417 *writable
= write_fault
;
1420 down_read(¤t
->mm
->mmap_sem
);
1421 npages
= get_user_page_nowait(addr
, write_fault
, page
);
1422 up_read(¤t
->mm
->mmap_sem
);
1424 unsigned int flags
= FOLL_HWPOISON
;
1427 flags
|= FOLL_WRITE
;
1429 npages
= get_user_pages_unlocked(addr
, 1, page
, flags
);
1434 /* map read fault as writable if possible */
1435 if (unlikely(!write_fault
) && writable
) {
1436 struct page
*wpage
[1];
1438 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1447 *pfn
= page_to_pfn(page
[0]);
1451 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1453 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1456 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1462 static int hva_to_pfn_remapped(struct vm_area_struct
*vma
,
1463 unsigned long addr
, bool *async
,
1464 bool write_fault
, kvm_pfn_t
*p_pfn
)
1469 r
= follow_pfn(vma
, addr
, &pfn
);
1472 * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
1473 * not call the fault handler, so do it here.
1475 bool unlocked
= false;
1476 r
= fixup_user_fault(current
, current
->mm
, addr
,
1477 (write_fault
? FAULT_FLAG_WRITE
: 0),
1484 r
= follow_pfn(vma
, addr
, &pfn
);
1492 * Get a reference here because callers of *hva_to_pfn* and
1493 * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the
1494 * returned pfn. This is only needed if the VMA has VM_MIXEDMAP
1495 * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will
1496 * simply do nothing for reserved pfns.
1498 * Whoever called remap_pfn_range is also going to call e.g.
1499 * unmap_mapping_range before the underlying pages are freed,
1500 * causing a call to our MMU notifier.
1509 * Pin guest page in memory and return its pfn.
1510 * @addr: host virtual address which maps memory to the guest
1511 * @atomic: whether this function can sleep
1512 * @async: whether this function need to wait IO complete if the
1513 * host page is not in the memory
1514 * @write_fault: whether we should get a writable host page
1515 * @writable: whether it allows to map a writable host page for !@write_fault
1517 * The function will map a writable host page for these two cases:
1518 * 1): @write_fault = true
1519 * 2): @write_fault = false && @writable, @writable will tell the caller
1520 * whether the mapping is writable.
1522 static kvm_pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1523 bool write_fault
, bool *writable
)
1525 struct vm_area_struct
*vma
;
1529 /* we can do it either atomically or asynchronously, not both */
1530 BUG_ON(atomic
&& async
);
1532 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1536 return KVM_PFN_ERR_FAULT
;
1538 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1542 down_read(¤t
->mm
->mmap_sem
);
1543 if (npages
== -EHWPOISON
||
1544 (!async
&& check_user_page_hwpoison(addr
))) {
1545 pfn
= KVM_PFN_ERR_HWPOISON
;
1550 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1553 pfn
= KVM_PFN_ERR_FAULT
;
1554 else if (vma
->vm_flags
& (VM_IO
| VM_PFNMAP
)) {
1555 r
= hva_to_pfn_remapped(vma
, addr
, async
, write_fault
, &pfn
);
1559 pfn
= KVM_PFN_ERR_FAULT
;
1561 if (async
&& vma_is_valid(vma
, write_fault
))
1563 pfn
= KVM_PFN_ERR_FAULT
;
1566 up_read(¤t
->mm
->mmap_sem
);
1570 kvm_pfn_t
__gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1571 bool atomic
, bool *async
, bool write_fault
,
1574 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1576 if (addr
== KVM_HVA_ERR_RO_BAD
) {
1579 return KVM_PFN_ERR_RO_FAULT
;
1582 if (kvm_is_error_hva(addr
)) {
1585 return KVM_PFN_NOSLOT
;
1588 /* Do not map writable pfn in the readonly memslot. */
1589 if (writable
&& memslot_is_readonly(slot
)) {
1594 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1597 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot
);
1599 kvm_pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1602 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
, false, NULL
,
1603 write_fault
, writable
);
1605 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1607 kvm_pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1609 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1611 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot
);
1613 kvm_pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1615 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1617 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1619 kvm_pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1621 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm
, gfn
), gfn
);
1623 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1625 kvm_pfn_t
kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1627 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1629 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic
);
1631 kvm_pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1633 return gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
);
1635 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1637 kvm_pfn_t
kvm_vcpu_gfn_to_pfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1639 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1641 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn
);
1643 int gfn_to_page_many_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1644 struct page
**pages
, int nr_pages
)
1649 addr
= gfn_to_hva_many(slot
, gfn
, &entry
);
1650 if (kvm_is_error_hva(addr
))
1653 if (entry
< nr_pages
)
1656 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1658 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1660 static struct page
*kvm_pfn_to_page(kvm_pfn_t pfn
)
1662 if (is_error_noslot_pfn(pfn
))
1663 return KVM_ERR_PTR_BAD_PAGE
;
1665 if (kvm_is_reserved_pfn(pfn
)) {
1667 return KVM_ERR_PTR_BAD_PAGE
;
1670 return pfn_to_page(pfn
);
1673 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1677 pfn
= gfn_to_pfn(kvm
, gfn
);
1679 return kvm_pfn_to_page(pfn
);
1681 EXPORT_SYMBOL_GPL(gfn_to_page
);
1683 struct page
*kvm_vcpu_gfn_to_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1687 pfn
= kvm_vcpu_gfn_to_pfn(vcpu
, gfn
);
1689 return kvm_pfn_to_page(pfn
);
1691 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page
);
1693 void kvm_release_page_clean(struct page
*page
)
1695 WARN_ON(is_error_page(page
));
1697 kvm_release_pfn_clean(page_to_pfn(page
));
1699 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1701 void kvm_release_pfn_clean(kvm_pfn_t pfn
)
1703 if (!is_error_noslot_pfn(pfn
) && !kvm_is_reserved_pfn(pfn
))
1704 put_page(pfn_to_page(pfn
));
1706 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1708 void kvm_release_page_dirty(struct page
*page
)
1710 WARN_ON(is_error_page(page
));
1712 kvm_release_pfn_dirty(page_to_pfn(page
));
1714 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1716 static void kvm_release_pfn_dirty(kvm_pfn_t pfn
)
1718 kvm_set_pfn_dirty(pfn
);
1719 kvm_release_pfn_clean(pfn
);
1722 void kvm_set_pfn_dirty(kvm_pfn_t pfn
)
1724 if (!kvm_is_reserved_pfn(pfn
)) {
1725 struct page
*page
= pfn_to_page(pfn
);
1727 if (!PageReserved(page
))
1731 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1733 void kvm_set_pfn_accessed(kvm_pfn_t pfn
)
1735 if (!kvm_is_reserved_pfn(pfn
))
1736 mark_page_accessed(pfn_to_page(pfn
));
1738 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1740 void kvm_get_pfn(kvm_pfn_t pfn
)
1742 if (!kvm_is_reserved_pfn(pfn
))
1743 get_page(pfn_to_page(pfn
));
1745 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1747 static int next_segment(unsigned long len
, int offset
)
1749 if (len
> PAGE_SIZE
- offset
)
1750 return PAGE_SIZE
- offset
;
1755 static int __kvm_read_guest_page(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1756 void *data
, int offset
, int len
)
1761 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1762 if (kvm_is_error_hva(addr
))
1764 r
= __copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1770 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1773 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1775 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1777 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1779 int kvm_vcpu_read_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
, void *data
,
1780 int offset
, int len
)
1782 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1784 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1786 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page
);
1788 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1790 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1792 int offset
= offset_in_page(gpa
);
1795 while ((seg
= next_segment(len
, offset
)) != 0) {
1796 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1806 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1808 int kvm_vcpu_read_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, void *data
, unsigned long len
)
1810 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1812 int offset
= offset_in_page(gpa
);
1815 while ((seg
= next_segment(len
, offset
)) != 0) {
1816 ret
= kvm_vcpu_read_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1826 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest
);
1828 static int __kvm_read_guest_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1829 void *data
, int offset
, unsigned long len
)
1834 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1835 if (kvm_is_error_hva(addr
))
1837 pagefault_disable();
1838 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1845 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1848 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1849 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1850 int offset
= offset_in_page(gpa
);
1852 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1854 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic
);
1856 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
1857 void *data
, unsigned long len
)
1859 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1860 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1861 int offset
= offset_in_page(gpa
);
1863 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1865 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic
);
1867 static int __kvm_write_guest_page(struct kvm_memory_slot
*memslot
, gfn_t gfn
,
1868 const void *data
, int offset
, int len
)
1873 addr
= gfn_to_hva_memslot(memslot
, gfn
);
1874 if (kvm_is_error_hva(addr
))
1876 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1879 mark_page_dirty_in_slot(memslot
, gfn
);
1883 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
,
1884 const void *data
, int offset
, int len
)
1886 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1888 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
1890 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1892 int kvm_vcpu_write_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
,
1893 const void *data
, int offset
, int len
)
1895 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1897 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
1899 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page
);
1901 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1904 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1906 int offset
= offset_in_page(gpa
);
1909 while ((seg
= next_segment(len
, offset
)) != 0) {
1910 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1920 EXPORT_SYMBOL_GPL(kvm_write_guest
);
1922 int kvm_vcpu_write_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, const void *data
,
1925 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1927 int offset
= offset_in_page(gpa
);
1930 while ((seg
= next_segment(len
, offset
)) != 0) {
1931 ret
= kvm_vcpu_write_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1941 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest
);
1943 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1944 gpa_t gpa
, unsigned long len
)
1946 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1947 int offset
= offset_in_page(gpa
);
1948 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
1949 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
1950 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
1951 gfn_t nr_pages_avail
;
1954 ghc
->generation
= slots
->generation
;
1956 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1957 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
, NULL
);
1958 if (!kvm_is_error_hva(ghc
->hva
) && nr_pages_needed
<= 1) {
1962 * If the requested region crosses two memslots, we still
1963 * verify that the entire region is valid here.
1965 while (start_gfn
<= end_gfn
) {
1966 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1967 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
1969 if (kvm_is_error_hva(ghc
->hva
))
1971 start_gfn
+= nr_pages_avail
;
1973 /* Use the slow path for cross page reads and writes. */
1974 ghc
->memslot
= NULL
;
1978 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1980 int kvm_write_guest_offset_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1981 void *data
, int offset
, unsigned long len
)
1983 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1985 gpa_t gpa
= ghc
->gpa
+ offset
;
1987 BUG_ON(len
+ offset
> ghc
->len
);
1989 if (slots
->generation
!= ghc
->generation
)
1990 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1992 if (unlikely(!ghc
->memslot
))
1993 return kvm_write_guest(kvm
, gpa
, data
, len
);
1995 if (kvm_is_error_hva(ghc
->hva
))
1998 r
= __copy_to_user((void __user
*)ghc
->hva
+ offset
, data
, len
);
2001 mark_page_dirty_in_slot(ghc
->memslot
, gpa
>> PAGE_SHIFT
);
2005 EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached
);
2007 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2008 void *data
, unsigned long len
)
2010 return kvm_write_guest_offset_cached(kvm
, ghc
, data
, 0, len
);
2012 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
2014 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2015 void *data
, unsigned long len
)
2017 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
2020 BUG_ON(len
> ghc
->len
);
2022 if (slots
->generation
!= ghc
->generation
)
2023 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
2025 if (unlikely(!ghc
->memslot
))
2026 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
2028 if (kvm_is_error_hva(ghc
->hva
))
2031 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
2037 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
2039 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
2041 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2043 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
2045 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
2047 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
2049 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2051 int offset
= offset_in_page(gpa
);
2054 while ((seg
= next_segment(len
, offset
)) != 0) {
2055 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
2064 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
2066 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
,
2069 if (memslot
&& memslot
->dirty_bitmap
) {
2070 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
2072 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
2076 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
2078 struct kvm_memory_slot
*memslot
;
2080 memslot
= gfn_to_memslot(kvm
, gfn
);
2081 mark_page_dirty_in_slot(memslot
, gfn
);
2083 EXPORT_SYMBOL_GPL(mark_page_dirty
);
2085 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
2087 struct kvm_memory_slot
*memslot
;
2089 memslot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2090 mark_page_dirty_in_slot(memslot
, gfn
);
2092 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty
);
2094 static void grow_halt_poll_ns(struct kvm_vcpu
*vcpu
)
2096 unsigned int old
, val
, grow
;
2098 old
= val
= vcpu
->halt_poll_ns
;
2099 grow
= READ_ONCE(halt_poll_ns_grow
);
2101 if (val
== 0 && grow
)
2106 if (val
> halt_poll_ns
)
2109 vcpu
->halt_poll_ns
= val
;
2110 trace_kvm_halt_poll_ns_grow(vcpu
->vcpu_id
, val
, old
);
2113 static void shrink_halt_poll_ns(struct kvm_vcpu
*vcpu
)
2115 unsigned int old
, val
, shrink
;
2117 old
= val
= vcpu
->halt_poll_ns
;
2118 shrink
= READ_ONCE(halt_poll_ns_shrink
);
2124 vcpu
->halt_poll_ns
= val
;
2125 trace_kvm_halt_poll_ns_shrink(vcpu
->vcpu_id
, val
, old
);
2128 static int kvm_vcpu_check_block(struct kvm_vcpu
*vcpu
)
2130 if (kvm_arch_vcpu_runnable(vcpu
)) {
2131 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
2134 if (kvm_cpu_has_pending_timer(vcpu
))
2136 if (signal_pending(current
))
2143 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
2145 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
2148 DECLARE_SWAITQUEUE(wait
);
2149 bool waited
= false;
2152 start
= cur
= ktime_get();
2153 if (vcpu
->halt_poll_ns
) {
2154 ktime_t stop
= ktime_add_ns(ktime_get(), vcpu
->halt_poll_ns
);
2156 ++vcpu
->stat
.halt_attempted_poll
;
2159 * This sets KVM_REQ_UNHALT if an interrupt
2162 if (kvm_vcpu_check_block(vcpu
) < 0) {
2163 ++vcpu
->stat
.halt_successful_poll
;
2164 if (!vcpu_valid_wakeup(vcpu
))
2165 ++vcpu
->stat
.halt_poll_invalid
;
2169 } while (single_task_running() && ktime_before(cur
, stop
));
2172 kvm_arch_vcpu_blocking(vcpu
);
2175 prepare_to_swait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
2177 if (kvm_vcpu_check_block(vcpu
) < 0)
2184 finish_swait(&vcpu
->wq
, &wait
);
2187 kvm_arch_vcpu_unblocking(vcpu
);
2189 block_ns
= ktime_to_ns(cur
) - ktime_to_ns(start
);
2191 if (!vcpu_valid_wakeup(vcpu
))
2192 shrink_halt_poll_ns(vcpu
);
2193 else if (halt_poll_ns
) {
2194 if (block_ns
<= vcpu
->halt_poll_ns
)
2196 /* we had a long block, shrink polling */
2197 else if (vcpu
->halt_poll_ns
&& block_ns
> halt_poll_ns
)
2198 shrink_halt_poll_ns(vcpu
);
2199 /* we had a short halt and our poll time is too small */
2200 else if (vcpu
->halt_poll_ns
< halt_poll_ns
&&
2201 block_ns
< halt_poll_ns
)
2202 grow_halt_poll_ns(vcpu
);
2204 vcpu
->halt_poll_ns
= 0;
2206 trace_kvm_vcpu_wakeup(block_ns
, waited
, vcpu_valid_wakeup(vcpu
));
2207 kvm_arch_vcpu_block_finish(vcpu
);
2209 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
2212 void kvm_vcpu_wake_up(struct kvm_vcpu
*vcpu
)
2214 struct swait_queue_head
*wqp
;
2216 wqp
= kvm_arch_vcpu_wq(vcpu
);
2217 if (swait_active(wqp
)) {
2219 ++vcpu
->stat
.halt_wakeup
;
2223 EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up
);
2226 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2228 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
2231 int cpu
= vcpu
->cpu
;
2233 kvm_vcpu_wake_up(vcpu
);
2235 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
2236 if (kvm_arch_vcpu_should_kick(vcpu
))
2237 smp_send_reschedule(cpu
);
2240 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
2241 #endif /* !CONFIG_S390 */
2243 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
2246 struct task_struct
*task
= NULL
;
2250 pid
= rcu_dereference(target
->pid
);
2252 task
= get_pid_task(pid
, PIDTYPE_PID
);
2256 ret
= yield_to(task
, 1);
2257 put_task_struct(task
);
2261 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
2264 * Helper that checks whether a VCPU is eligible for directed yield.
2265 * Most eligible candidate to yield is decided by following heuristics:
2267 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2268 * (preempted lock holder), indicated by @in_spin_loop.
2269 * Set at the beiginning and cleared at the end of interception/PLE handler.
2271 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2272 * chance last time (mostly it has become eligible now since we have probably
2273 * yielded to lockholder in last iteration. This is done by toggling
2274 * @dy_eligible each time a VCPU checked for eligibility.)
2276 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2277 * to preempted lock-holder could result in wrong VCPU selection and CPU
2278 * burning. Giving priority for a potential lock-holder increases lock
2281 * Since algorithm is based on heuristics, accessing another VCPU data without
2282 * locking does not harm. It may result in trying to yield to same VCPU, fail
2283 * and continue with next VCPU and so on.
2285 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
2287 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2290 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
2291 vcpu
->spin_loop
.dy_eligible
;
2293 if (vcpu
->spin_loop
.in_spin_loop
)
2294 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
2302 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
2304 struct kvm
*kvm
= me
->kvm
;
2305 struct kvm_vcpu
*vcpu
;
2306 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
2312 kvm_vcpu_set_in_spin_loop(me
, true);
2314 * We boost the priority of a VCPU that is runnable but not
2315 * currently running, because it got preempted by something
2316 * else and called schedule in __vcpu_run. Hopefully that
2317 * VCPU is holding the lock that we need and will release it.
2318 * We approximate round-robin by starting at the last boosted VCPU.
2320 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
2321 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
2322 if (!pass
&& i
<= last_boosted_vcpu
) {
2323 i
= last_boosted_vcpu
;
2325 } else if (pass
&& i
> last_boosted_vcpu
)
2327 if (!ACCESS_ONCE(vcpu
->preempted
))
2331 if (swait_active(&vcpu
->wq
) && !kvm_arch_vcpu_runnable(vcpu
))
2333 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
2336 yielded
= kvm_vcpu_yield_to(vcpu
);
2338 kvm
->last_boosted_vcpu
= i
;
2340 } else if (yielded
< 0) {
2347 kvm_vcpu_set_in_spin_loop(me
, false);
2349 /* Ensure vcpu is not eligible during next spinloop */
2350 kvm_vcpu_set_dy_eligible(me
, false);
2352 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
2354 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2356 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
2359 if (vmf
->pgoff
== 0)
2360 page
= virt_to_page(vcpu
->run
);
2362 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
2363 page
= virt_to_page(vcpu
->arch
.pio_data
);
2365 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2366 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
2367 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
2370 return kvm_arch_vcpu_fault(vcpu
, vmf
);
2376 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
2377 .fault
= kvm_vcpu_fault
,
2380 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2382 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
2386 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
2388 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2390 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2391 kvm_put_kvm(vcpu
->kvm
);
2395 static struct file_operations kvm_vcpu_fops
= {
2396 .release
= kvm_vcpu_release
,
2397 .unlocked_ioctl
= kvm_vcpu_ioctl
,
2398 #ifdef CONFIG_KVM_COMPAT
2399 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
2401 .mmap
= kvm_vcpu_mmap
,
2402 .llseek
= noop_llseek
,
2406 * Allocates an inode for the vcpu.
2408 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
2410 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
2413 static int kvm_create_vcpu_debugfs(struct kvm_vcpu
*vcpu
)
2415 char dir_name
[ITOA_MAX_LEN
* 2];
2418 if (!kvm_arch_has_vcpu_debugfs())
2421 if (!debugfs_initialized())
2424 snprintf(dir_name
, sizeof(dir_name
), "vcpu%d", vcpu
->vcpu_id
);
2425 vcpu
->debugfs_dentry
= debugfs_create_dir(dir_name
,
2426 vcpu
->kvm
->debugfs_dentry
);
2427 if (!vcpu
->debugfs_dentry
)
2430 ret
= kvm_arch_create_vcpu_debugfs(vcpu
);
2432 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2440 * Creates some virtual cpus. Good luck creating more than one.
2442 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
2445 struct kvm_vcpu
*vcpu
;
2447 if (id
>= KVM_MAX_VCPU_ID
)
2450 mutex_lock(&kvm
->lock
);
2451 if (kvm
->created_vcpus
== KVM_MAX_VCPUS
) {
2452 mutex_unlock(&kvm
->lock
);
2456 kvm
->created_vcpus
++;
2457 mutex_unlock(&kvm
->lock
);
2459 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
2462 goto vcpu_decrement
;
2465 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
2467 r
= kvm_arch_vcpu_setup(vcpu
);
2471 r
= kvm_create_vcpu_debugfs(vcpu
);
2475 mutex_lock(&kvm
->lock
);
2476 if (kvm_get_vcpu_by_id(kvm
, id
)) {
2478 goto unlock_vcpu_destroy
;
2481 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
2483 /* Now it's all set up, let userspace reach it */
2485 r
= create_vcpu_fd(vcpu
);
2488 goto unlock_vcpu_destroy
;
2491 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
2494 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2495 * before kvm->online_vcpu's incremented value.
2498 atomic_inc(&kvm
->online_vcpus
);
2500 mutex_unlock(&kvm
->lock
);
2501 kvm_arch_vcpu_postcreate(vcpu
);
2504 unlock_vcpu_destroy
:
2505 mutex_unlock(&kvm
->lock
);
2506 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2508 kvm_arch_vcpu_destroy(vcpu
);
2510 mutex_lock(&kvm
->lock
);
2511 kvm
->created_vcpus
--;
2512 mutex_unlock(&kvm
->lock
);
2516 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
2519 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
2520 vcpu
->sigset_active
= 1;
2521 vcpu
->sigset
= *sigset
;
2523 vcpu
->sigset_active
= 0;
2527 static long kvm_vcpu_ioctl(struct file
*filp
,
2528 unsigned int ioctl
, unsigned long arg
)
2530 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2531 void __user
*argp
= (void __user
*)arg
;
2533 struct kvm_fpu
*fpu
= NULL
;
2534 struct kvm_sregs
*kvm_sregs
= NULL
;
2536 if (vcpu
->kvm
->mm
!= current
->mm
)
2539 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
2542 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2544 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2545 * so vcpu_load() would break it.
2547 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_S390_IRQ
|| ioctl
== KVM_INTERRUPT
)
2548 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2552 r
= vcpu_load(vcpu
);
2560 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
2561 /* The thread running this VCPU changed. */
2562 struct pid
*oldpid
= vcpu
->pid
;
2563 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
2565 rcu_assign_pointer(vcpu
->pid
, newpid
);
2570 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
2571 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
2573 case KVM_GET_REGS
: {
2574 struct kvm_regs
*kvm_regs
;
2577 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
2580 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2584 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2591 case KVM_SET_REGS
: {
2592 struct kvm_regs
*kvm_regs
;
2595 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2596 if (IS_ERR(kvm_regs
)) {
2597 r
= PTR_ERR(kvm_regs
);
2600 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2604 case KVM_GET_SREGS
: {
2605 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2609 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2613 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2618 case KVM_SET_SREGS
: {
2619 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2620 if (IS_ERR(kvm_sregs
)) {
2621 r
= PTR_ERR(kvm_sregs
);
2625 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2628 case KVM_GET_MP_STATE
: {
2629 struct kvm_mp_state mp_state
;
2631 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2635 if (copy_to_user(argp
, &mp_state
, sizeof(mp_state
)))
2640 case KVM_SET_MP_STATE
: {
2641 struct kvm_mp_state mp_state
;
2644 if (copy_from_user(&mp_state
, argp
, sizeof(mp_state
)))
2646 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2649 case KVM_TRANSLATE
: {
2650 struct kvm_translation tr
;
2653 if (copy_from_user(&tr
, argp
, sizeof(tr
)))
2655 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2659 if (copy_to_user(argp
, &tr
, sizeof(tr
)))
2664 case KVM_SET_GUEST_DEBUG
: {
2665 struct kvm_guest_debug dbg
;
2668 if (copy_from_user(&dbg
, argp
, sizeof(dbg
)))
2670 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2673 case KVM_SET_SIGNAL_MASK
: {
2674 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2675 struct kvm_signal_mask kvm_sigmask
;
2676 sigset_t sigset
, *p
;
2681 if (copy_from_user(&kvm_sigmask
, argp
,
2682 sizeof(kvm_sigmask
)))
2685 if (kvm_sigmask
.len
!= sizeof(sigset
))
2688 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2693 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2697 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2701 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2705 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2711 fpu
= memdup_user(argp
, sizeof(*fpu
));
2717 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2721 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2730 #ifdef CONFIG_KVM_COMPAT
2731 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2732 unsigned int ioctl
, unsigned long arg
)
2734 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2735 void __user
*argp
= compat_ptr(arg
);
2738 if (vcpu
->kvm
->mm
!= current
->mm
)
2742 case KVM_SET_SIGNAL_MASK
: {
2743 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2744 struct kvm_signal_mask kvm_sigmask
;
2745 compat_sigset_t csigset
;
2750 if (copy_from_user(&kvm_sigmask
, argp
,
2751 sizeof(kvm_sigmask
)))
2754 if (kvm_sigmask
.len
!= sizeof(csigset
))
2757 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2760 sigset_from_compat(&sigset
, &csigset
);
2761 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2763 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2767 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2775 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2776 int (*accessor
)(struct kvm_device
*dev
,
2777 struct kvm_device_attr
*attr
),
2780 struct kvm_device_attr attr
;
2785 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2788 return accessor(dev
, &attr
);
2791 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2794 struct kvm_device
*dev
= filp
->private_data
;
2797 case KVM_SET_DEVICE_ATTR
:
2798 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2799 case KVM_GET_DEVICE_ATTR
:
2800 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2801 case KVM_HAS_DEVICE_ATTR
:
2802 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
2804 if (dev
->ops
->ioctl
)
2805 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
2811 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
2813 struct kvm_device
*dev
= filp
->private_data
;
2814 struct kvm
*kvm
= dev
->kvm
;
2820 static const struct file_operations kvm_device_fops
= {
2821 .unlocked_ioctl
= kvm_device_ioctl
,
2822 #ifdef CONFIG_KVM_COMPAT
2823 .compat_ioctl
= kvm_device_ioctl
,
2825 .release
= kvm_device_release
,
2828 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
2830 if (filp
->f_op
!= &kvm_device_fops
)
2833 return filp
->private_data
;
2836 static struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
2837 #ifdef CONFIG_KVM_MPIC
2838 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
2839 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
2842 #ifdef CONFIG_KVM_XICS
2843 [KVM_DEV_TYPE_XICS
] = &kvm_xics_ops
,
2847 int kvm_register_device_ops(struct kvm_device_ops
*ops
, u32 type
)
2849 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
2852 if (kvm_device_ops_table
[type
] != NULL
)
2855 kvm_device_ops_table
[type
] = ops
;
2859 void kvm_unregister_device_ops(u32 type
)
2861 if (kvm_device_ops_table
[type
] != NULL
)
2862 kvm_device_ops_table
[type
] = NULL
;
2865 static int kvm_ioctl_create_device(struct kvm
*kvm
,
2866 struct kvm_create_device
*cd
)
2868 struct kvm_device_ops
*ops
= NULL
;
2869 struct kvm_device
*dev
;
2870 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
2873 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
2876 ops
= kvm_device_ops_table
[cd
->type
];
2883 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2890 mutex_lock(&kvm
->lock
);
2891 ret
= ops
->create(dev
, cd
->type
);
2893 mutex_unlock(&kvm
->lock
);
2897 list_add(&dev
->vm_node
, &kvm
->devices
);
2898 mutex_unlock(&kvm
->lock
);
2903 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
2905 mutex_lock(&kvm
->lock
);
2906 list_del(&dev
->vm_node
);
2907 mutex_unlock(&kvm
->lock
);
2917 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
2920 case KVM_CAP_USER_MEMORY
:
2921 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2922 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2923 case KVM_CAP_INTERNAL_ERROR_DATA
:
2924 #ifdef CONFIG_HAVE_KVM_MSI
2925 case KVM_CAP_SIGNAL_MSI
:
2927 #ifdef CONFIG_HAVE_KVM_IRQFD
2929 case KVM_CAP_IRQFD_RESAMPLE
:
2931 case KVM_CAP_IOEVENTFD_ANY_LENGTH
:
2932 case KVM_CAP_CHECK_EXTENSION_VM
:
2934 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2935 case KVM_CAP_IRQ_ROUTING
:
2936 return KVM_MAX_IRQ_ROUTES
;
2938 #if KVM_ADDRESS_SPACE_NUM > 1
2939 case KVM_CAP_MULTI_ADDRESS_SPACE
:
2940 return KVM_ADDRESS_SPACE_NUM
;
2942 case KVM_CAP_MAX_VCPU_ID
:
2943 return KVM_MAX_VCPU_ID
;
2947 return kvm_vm_ioctl_check_extension(kvm
, arg
);
2950 static long kvm_vm_ioctl(struct file
*filp
,
2951 unsigned int ioctl
, unsigned long arg
)
2953 struct kvm
*kvm
= filp
->private_data
;
2954 void __user
*argp
= (void __user
*)arg
;
2957 if (kvm
->mm
!= current
->mm
)
2960 case KVM_CREATE_VCPU
:
2961 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2963 case KVM_SET_USER_MEMORY_REGION
: {
2964 struct kvm_userspace_memory_region kvm_userspace_mem
;
2967 if (copy_from_user(&kvm_userspace_mem
, argp
,
2968 sizeof(kvm_userspace_mem
)))
2971 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
2974 case KVM_GET_DIRTY_LOG
: {
2975 struct kvm_dirty_log log
;
2978 if (copy_from_user(&log
, argp
, sizeof(log
)))
2980 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2983 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2984 case KVM_REGISTER_COALESCED_MMIO
: {
2985 struct kvm_coalesced_mmio_zone zone
;
2988 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2990 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2993 case KVM_UNREGISTER_COALESCED_MMIO
: {
2994 struct kvm_coalesced_mmio_zone zone
;
2997 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2999 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
3004 struct kvm_irqfd data
;
3007 if (copy_from_user(&data
, argp
, sizeof(data
)))
3009 r
= kvm_irqfd(kvm
, &data
);
3012 case KVM_IOEVENTFD
: {
3013 struct kvm_ioeventfd data
;
3016 if (copy_from_user(&data
, argp
, sizeof(data
)))
3018 r
= kvm_ioeventfd(kvm
, &data
);
3021 #ifdef CONFIG_HAVE_KVM_MSI
3022 case KVM_SIGNAL_MSI
: {
3026 if (copy_from_user(&msi
, argp
, sizeof(msi
)))
3028 r
= kvm_send_userspace_msi(kvm
, &msi
);
3032 #ifdef __KVM_HAVE_IRQ_LINE
3033 case KVM_IRQ_LINE_STATUS
:
3034 case KVM_IRQ_LINE
: {
3035 struct kvm_irq_level irq_event
;
3038 if (copy_from_user(&irq_event
, argp
, sizeof(irq_event
)))
3041 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
3042 ioctl
== KVM_IRQ_LINE_STATUS
);
3047 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
3048 if (copy_to_user(argp
, &irq_event
, sizeof(irq_event
)))
3056 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3057 case KVM_SET_GSI_ROUTING
: {
3058 struct kvm_irq_routing routing
;
3059 struct kvm_irq_routing __user
*urouting
;
3060 struct kvm_irq_routing_entry
*entries
= NULL
;
3063 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
3066 if (routing
.nr
> KVM_MAX_IRQ_ROUTES
)
3072 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
3077 if (copy_from_user(entries
, urouting
->entries
,
3078 routing
.nr
* sizeof(*entries
)))
3079 goto out_free_irq_routing
;
3081 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
3083 out_free_irq_routing
:
3087 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
3088 case KVM_CREATE_DEVICE
: {
3089 struct kvm_create_device cd
;
3092 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
3095 r
= kvm_ioctl_create_device(kvm
, &cd
);
3100 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
3106 case KVM_CHECK_EXTENSION
:
3107 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
3110 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
3116 #ifdef CONFIG_KVM_COMPAT
3117 struct compat_kvm_dirty_log
{
3121 compat_uptr_t dirty_bitmap
; /* one bit per page */
3126 static long kvm_vm_compat_ioctl(struct file
*filp
,
3127 unsigned int ioctl
, unsigned long arg
)
3129 struct kvm
*kvm
= filp
->private_data
;
3132 if (kvm
->mm
!= current
->mm
)
3135 case KVM_GET_DIRTY_LOG
: {
3136 struct compat_kvm_dirty_log compat_log
;
3137 struct kvm_dirty_log log
;
3140 if (copy_from_user(&compat_log
, (void __user
*)arg
,
3141 sizeof(compat_log
)))
3143 log
.slot
= compat_log
.slot
;
3144 log
.padding1
= compat_log
.padding1
;
3145 log
.padding2
= compat_log
.padding2
;
3146 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
3148 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
3152 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
3160 static struct file_operations kvm_vm_fops
= {
3161 .release
= kvm_vm_release
,
3162 .unlocked_ioctl
= kvm_vm_ioctl
,
3163 #ifdef CONFIG_KVM_COMPAT
3164 .compat_ioctl
= kvm_vm_compat_ioctl
,
3166 .llseek
= noop_llseek
,
3169 static int kvm_dev_ioctl_create_vm(unsigned long type
)
3175 kvm
= kvm_create_vm(type
);
3177 return PTR_ERR(kvm
);
3178 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
3179 r
= kvm_coalesced_mmio_init(kvm
);
3185 r
= get_unused_fd_flags(O_CLOEXEC
);
3190 file
= anon_inode_getfile("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
3194 return PTR_ERR(file
);
3197 if (kvm_create_vm_debugfs(kvm
, r
) < 0) {
3203 fd_install(r
, file
);
3207 static long kvm_dev_ioctl(struct file
*filp
,
3208 unsigned int ioctl
, unsigned long arg
)
3213 case KVM_GET_API_VERSION
:
3216 r
= KVM_API_VERSION
;
3219 r
= kvm_dev_ioctl_create_vm(arg
);
3221 case KVM_CHECK_EXTENSION
:
3222 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
3224 case KVM_GET_VCPU_MMAP_SIZE
:
3227 r
= PAGE_SIZE
; /* struct kvm_run */
3229 r
+= PAGE_SIZE
; /* pio data page */
3231 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
3232 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
3235 case KVM_TRACE_ENABLE
:
3236 case KVM_TRACE_PAUSE
:
3237 case KVM_TRACE_DISABLE
:
3241 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
3247 static struct file_operations kvm_chardev_ops
= {
3248 .unlocked_ioctl
= kvm_dev_ioctl
,
3249 .compat_ioctl
= kvm_dev_ioctl
,
3250 .llseek
= noop_llseek
,
3253 static struct miscdevice kvm_dev
= {
3259 static void hardware_enable_nolock(void *junk
)
3261 int cpu
= raw_smp_processor_id();
3264 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3267 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
3269 r
= kvm_arch_hardware_enable();
3272 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3273 atomic_inc(&hardware_enable_failed
);
3274 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu
);
3278 static int kvm_starting_cpu(unsigned int cpu
)
3280 raw_spin_lock(&kvm_count_lock
);
3281 if (kvm_usage_count
)
3282 hardware_enable_nolock(NULL
);
3283 raw_spin_unlock(&kvm_count_lock
);
3287 static void hardware_disable_nolock(void *junk
)
3289 int cpu
= raw_smp_processor_id();
3291 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3293 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3294 kvm_arch_hardware_disable();
3297 static int kvm_dying_cpu(unsigned int cpu
)
3299 raw_spin_lock(&kvm_count_lock
);
3300 if (kvm_usage_count
)
3301 hardware_disable_nolock(NULL
);
3302 raw_spin_unlock(&kvm_count_lock
);
3306 static void hardware_disable_all_nolock(void)
3308 BUG_ON(!kvm_usage_count
);
3311 if (!kvm_usage_count
)
3312 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3315 static void hardware_disable_all(void)
3317 raw_spin_lock(&kvm_count_lock
);
3318 hardware_disable_all_nolock();
3319 raw_spin_unlock(&kvm_count_lock
);
3322 static int hardware_enable_all(void)
3326 raw_spin_lock(&kvm_count_lock
);
3329 if (kvm_usage_count
== 1) {
3330 atomic_set(&hardware_enable_failed
, 0);
3331 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
3333 if (atomic_read(&hardware_enable_failed
)) {
3334 hardware_disable_all_nolock();
3339 raw_spin_unlock(&kvm_count_lock
);
3344 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
3348 * Some (well, at least mine) BIOSes hang on reboot if
3351 * And Intel TXT required VMX off for all cpu when system shutdown.
3353 pr_info("kvm: exiting hardware virtualization\n");
3354 kvm_rebooting
= true;
3355 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3359 static struct notifier_block kvm_reboot_notifier
= {
3360 .notifier_call
= kvm_reboot
,
3364 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
3368 for (i
= 0; i
< bus
->dev_count
; i
++) {
3369 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
3371 kvm_iodevice_destructor(pos
);
3376 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
3377 const struct kvm_io_range
*r2
)
3379 gpa_t addr1
= r1
->addr
;
3380 gpa_t addr2
= r2
->addr
;
3385 /* If r2->len == 0, match the exact address. If r2->len != 0,
3386 * accept any overlapping write. Any order is acceptable for
3387 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3388 * we process all of them.
3401 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
3403 return kvm_io_bus_cmp(p1
, p2
);
3406 static int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
3407 gpa_t addr
, int len
)
3409 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
3415 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
3416 kvm_io_bus_sort_cmp
, NULL
);
3421 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
3422 gpa_t addr
, int len
)
3424 struct kvm_io_range
*range
, key
;
3427 key
= (struct kvm_io_range
) {
3432 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
3433 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
3437 off
= range
- bus
->range
;
3439 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
3445 static int __kvm_io_bus_write(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3446 struct kvm_io_range
*range
, const void *val
)
3450 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3454 while (idx
< bus
->dev_count
&&
3455 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3456 if (!kvm_iodevice_write(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3465 /* kvm_io_bus_write - called under kvm->slots_lock */
3466 int kvm_io_bus_write(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3467 int len
, const void *val
)
3469 struct kvm_io_bus
*bus
;
3470 struct kvm_io_range range
;
3473 range
= (struct kvm_io_range
) {
3478 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3481 r
= __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3482 return r
< 0 ? r
: 0;
3485 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3486 int kvm_io_bus_write_cookie(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
,
3487 gpa_t addr
, int len
, const void *val
, long cookie
)
3489 struct kvm_io_bus
*bus
;
3490 struct kvm_io_range range
;
3492 range
= (struct kvm_io_range
) {
3497 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3501 /* First try the device referenced by cookie. */
3502 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
3503 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
3504 if (!kvm_iodevice_write(vcpu
, bus
->range
[cookie
].dev
, addr
, len
,
3509 * cookie contained garbage; fall back to search and return the
3510 * correct cookie value.
3512 return __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3515 static int __kvm_io_bus_read(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3516 struct kvm_io_range
*range
, void *val
)
3520 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3524 while (idx
< bus
->dev_count
&&
3525 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3526 if (!kvm_iodevice_read(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3534 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
3536 /* kvm_io_bus_read - called under kvm->slots_lock */
3537 int kvm_io_bus_read(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3540 struct kvm_io_bus
*bus
;
3541 struct kvm_io_range range
;
3544 range
= (struct kvm_io_range
) {
3549 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3552 r
= __kvm_io_bus_read(vcpu
, bus
, &range
, val
);
3553 return r
< 0 ? r
: 0;
3557 /* Caller must hold slots_lock. */
3558 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
3559 int len
, struct kvm_io_device
*dev
)
3561 struct kvm_io_bus
*new_bus
, *bus
;
3563 bus
= kvm
->buses
[bus_idx
];
3567 /* exclude ioeventfd which is limited by maximum fd */
3568 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
3571 new_bus
= kmalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
3572 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3575 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
3576 sizeof(struct kvm_io_range
)));
3577 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
3578 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3579 synchronize_srcu_expedited(&kvm
->srcu
);
3585 /* Caller must hold slots_lock. */
3586 void kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3587 struct kvm_io_device
*dev
)
3590 struct kvm_io_bus
*new_bus
, *bus
;
3592 bus
= kvm
->buses
[bus_idx
];
3596 for (i
= 0; i
< bus
->dev_count
; i
++)
3597 if (bus
->range
[i
].dev
== dev
) {
3601 if (i
== bus
->dev_count
)
3604 new_bus
= kmalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
3605 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3607 pr_err("kvm: failed to shrink bus, removing it completely\n");
3611 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3612 new_bus
->dev_count
--;
3613 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3614 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3617 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3618 synchronize_srcu_expedited(&kvm
->srcu
);
3623 struct kvm_io_device
*kvm_io_bus_get_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3626 struct kvm_io_bus
*bus
;
3627 int dev_idx
, srcu_idx
;
3628 struct kvm_io_device
*iodev
= NULL
;
3630 srcu_idx
= srcu_read_lock(&kvm
->srcu
);
3632 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
3636 dev_idx
= kvm_io_bus_get_first_dev(bus
, addr
, 1);
3640 iodev
= bus
->range
[dev_idx
].dev
;
3643 srcu_read_unlock(&kvm
->srcu
, srcu_idx
);
3647 EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev
);
3649 static int kvm_debugfs_open(struct inode
*inode
, struct file
*file
,
3650 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
3653 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)
3656 /* The debugfs files are a reference to the kvm struct which
3657 * is still valid when kvm_destroy_vm is called.
3658 * To avoid the race between open and the removal of the debugfs
3659 * directory we test against the users count.
3661 if (!atomic_add_unless(&stat_data
->kvm
->users_count
, 1, 0))
3664 if (simple_attr_open(inode
, file
, get
, set
, fmt
)) {
3665 kvm_put_kvm(stat_data
->kvm
);
3672 static int kvm_debugfs_release(struct inode
*inode
, struct file
*file
)
3674 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)
3677 simple_attr_release(inode
, file
);
3678 kvm_put_kvm(stat_data
->kvm
);
3683 static int vm_stat_get_per_vm(void *data
, u64
*val
)
3685 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3687 *val
= *(ulong
*)((void *)stat_data
->kvm
+ stat_data
->offset
);
3692 static int vm_stat_clear_per_vm(void *data
, u64 val
)
3694 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3699 *(ulong
*)((void *)stat_data
->kvm
+ stat_data
->offset
) = 0;
3704 static int vm_stat_get_per_vm_open(struct inode
*inode
, struct file
*file
)
3706 __simple_attr_check_format("%llu\n", 0ull);
3707 return kvm_debugfs_open(inode
, file
, vm_stat_get_per_vm
,
3708 vm_stat_clear_per_vm
, "%llu\n");
3711 static const struct file_operations vm_stat_get_per_vm_fops
= {
3712 .owner
= THIS_MODULE
,
3713 .open
= vm_stat_get_per_vm_open
,
3714 .release
= kvm_debugfs_release
,
3715 .read
= simple_attr_read
,
3716 .write
= simple_attr_write
,
3717 .llseek
= generic_file_llseek
,
3720 static int vcpu_stat_get_per_vm(void *data
, u64
*val
)
3723 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3724 struct kvm_vcpu
*vcpu
;
3728 kvm_for_each_vcpu(i
, vcpu
, stat_data
->kvm
)
3729 *val
+= *(u64
*)((void *)vcpu
+ stat_data
->offset
);
3734 static int vcpu_stat_clear_per_vm(void *data
, u64 val
)
3737 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3738 struct kvm_vcpu
*vcpu
;
3743 kvm_for_each_vcpu(i
, vcpu
, stat_data
->kvm
)
3744 *(u64
*)((void *)vcpu
+ stat_data
->offset
) = 0;
3749 static int vcpu_stat_get_per_vm_open(struct inode
*inode
, struct file
*file
)
3751 __simple_attr_check_format("%llu\n", 0ull);
3752 return kvm_debugfs_open(inode
, file
, vcpu_stat_get_per_vm
,
3753 vcpu_stat_clear_per_vm
, "%llu\n");
3756 static const struct file_operations vcpu_stat_get_per_vm_fops
= {
3757 .owner
= THIS_MODULE
,
3758 .open
= vcpu_stat_get_per_vm_open
,
3759 .release
= kvm_debugfs_release
,
3760 .read
= simple_attr_read
,
3761 .write
= simple_attr_write
,
3762 .llseek
= generic_file_llseek
,
3765 static const struct file_operations
*stat_fops_per_vm
[] = {
3766 [KVM_STAT_VCPU
] = &vcpu_stat_get_per_vm_fops
,
3767 [KVM_STAT_VM
] = &vm_stat_get_per_vm_fops
,
3770 static int vm_stat_get(void *_offset
, u64
*val
)
3772 unsigned offset
= (long)_offset
;
3774 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
3778 spin_lock(&kvm_lock
);
3779 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
3781 vm_stat_get_per_vm((void *)&stat_tmp
, &tmp_val
);
3784 spin_unlock(&kvm_lock
);
3788 static int vm_stat_clear(void *_offset
, u64 val
)
3790 unsigned offset
= (long)_offset
;
3792 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
3797 spin_lock(&kvm_lock
);
3798 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
3800 vm_stat_clear_per_vm((void *)&stat_tmp
, 0);
3802 spin_unlock(&kvm_lock
);
3807 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, vm_stat_clear
, "%llu\n");
3809 static int vcpu_stat_get(void *_offset
, u64
*val
)
3811 unsigned offset
= (long)_offset
;
3813 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
3817 spin_lock(&kvm_lock
);
3818 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
3820 vcpu_stat_get_per_vm((void *)&stat_tmp
, &tmp_val
);
3823 spin_unlock(&kvm_lock
);
3827 static int vcpu_stat_clear(void *_offset
, u64 val
)
3829 unsigned offset
= (long)_offset
;
3831 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
3836 spin_lock(&kvm_lock
);
3837 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
3839 vcpu_stat_clear_per_vm((void *)&stat_tmp
, 0);
3841 spin_unlock(&kvm_lock
);
3846 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, vcpu_stat_clear
,
3849 static const struct file_operations
*stat_fops
[] = {
3850 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
3851 [KVM_STAT_VM
] = &vm_stat_fops
,
3854 static int kvm_init_debug(void)
3857 struct kvm_stats_debugfs_item
*p
;
3859 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
3860 if (kvm_debugfs_dir
== NULL
)
3863 kvm_debugfs_num_entries
= 0;
3864 for (p
= debugfs_entries
; p
->name
; ++p
, kvm_debugfs_num_entries
++) {
3865 if (!debugfs_create_file(p
->name
, 0644, kvm_debugfs_dir
,
3866 (void *)(long)p
->offset
,
3867 stat_fops
[p
->kind
]))
3874 debugfs_remove_recursive(kvm_debugfs_dir
);
3879 static int kvm_suspend(void)
3881 if (kvm_usage_count
)
3882 hardware_disable_nolock(NULL
);
3886 static void kvm_resume(void)
3888 if (kvm_usage_count
) {
3889 WARN_ON(raw_spin_is_locked(&kvm_count_lock
));
3890 hardware_enable_nolock(NULL
);
3894 static struct syscore_ops kvm_syscore_ops
= {
3895 .suspend
= kvm_suspend
,
3896 .resume
= kvm_resume
,
3900 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
3902 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
3905 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
3907 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3909 if (vcpu
->preempted
)
3910 vcpu
->preempted
= false;
3912 kvm_arch_sched_in(vcpu
, cpu
);
3914 kvm_arch_vcpu_load(vcpu
, cpu
);
3917 static void kvm_sched_out(struct preempt_notifier
*pn
,
3918 struct task_struct
*next
)
3920 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3922 if (current
->state
== TASK_RUNNING
)
3923 vcpu
->preempted
= true;
3924 kvm_arch_vcpu_put(vcpu
);
3927 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
3928 struct module
*module
)
3933 r
= kvm_arch_init(opaque
);
3938 * kvm_arch_init makes sure there's at most one caller
3939 * for architectures that support multiple implementations,
3940 * like intel and amd on x86.
3941 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3942 * conflicts in case kvm is already setup for another implementation.
3944 r
= kvm_irqfd_init();
3948 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
3953 r
= kvm_arch_hardware_setup();
3957 for_each_online_cpu(cpu
) {
3958 smp_call_function_single(cpu
,
3959 kvm_arch_check_processor_compat
,
3965 r
= cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING
, "kvm/cpu:starting",
3966 kvm_starting_cpu
, kvm_dying_cpu
);
3969 register_reboot_notifier(&kvm_reboot_notifier
);
3971 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3973 vcpu_align
= __alignof__(struct kvm_vcpu
);
3974 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
3976 if (!kvm_vcpu_cache
) {
3981 r
= kvm_async_pf_init();
3985 kvm_chardev_ops
.owner
= module
;
3986 kvm_vm_fops
.owner
= module
;
3987 kvm_vcpu_fops
.owner
= module
;
3989 r
= misc_register(&kvm_dev
);
3991 pr_err("kvm: misc device register failed\n");
3995 register_syscore_ops(&kvm_syscore_ops
);
3997 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
3998 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
4000 r
= kvm_init_debug();
4002 pr_err("kvm: create debugfs files failed\n");
4006 r
= kvm_vfio_ops_init();
4012 unregister_syscore_ops(&kvm_syscore_ops
);
4013 misc_deregister(&kvm_dev
);
4015 kvm_async_pf_deinit();
4017 kmem_cache_destroy(kvm_vcpu_cache
);
4019 unregister_reboot_notifier(&kvm_reboot_notifier
);
4020 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING
);
4023 kvm_arch_hardware_unsetup();
4025 free_cpumask_var(cpus_hardware_enabled
);
4033 EXPORT_SYMBOL_GPL(kvm_init
);
4037 debugfs_remove_recursive(kvm_debugfs_dir
);
4038 misc_deregister(&kvm_dev
);
4039 kmem_cache_destroy(kvm_vcpu_cache
);
4040 kvm_async_pf_deinit();
4041 unregister_syscore_ops(&kvm_syscore_ops
);
4042 unregister_reboot_notifier(&kvm_reboot_notifier
);
4043 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING
);
4044 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
4045 kvm_arch_hardware_unsetup();
4048 free_cpumask_var(cpus_hardware_enabled
);
4049 kvm_vfio_ops_exit();
4051 EXPORT_SYMBOL_GPL(kvm_exit
);