2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
8 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
19 #include <kvm/iodev.h>
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/percpu.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/syscore_ops.h>
34 #include <linux/cpu.h>
35 #include <linux/sched/signal.h>
36 #include <linux/sched/mm.h>
37 #include <linux/sched/stat.h>
38 #include <linux/cpumask.h>
39 #include <linux/smp.h>
40 #include <linux/anon_inodes.h>
41 #include <linux/profile.h>
42 #include <linux/kvm_para.h>
43 #include <linux/pagemap.h>
44 #include <linux/mman.h>
45 #include <linux/swap.h>
46 #include <linux/bitops.h>
47 #include <linux/spinlock.h>
48 #include <linux/compat.h>
49 #include <linux/srcu.h>
50 #include <linux/hugetlb.h>
51 #include <linux/slab.h>
52 #include <linux/sort.h>
53 #include <linux/bsearch.h>
55 #include <linux/lockdep.h>
57 #include <asm/processor.h>
58 #include <asm/ioctl.h>
59 #include <linux/uaccess.h>
60 #include <asm/pgtable.h>
62 #include "coalesced_mmio.h"
66 #define CREATE_TRACE_POINTS
67 #include <trace/events/kvm.h>
69 /* Worst case buffer size needed for holding an integer. */
70 #define ITOA_MAX_LEN 12
72 MODULE_AUTHOR("Qumranet");
73 MODULE_LICENSE("GPL");
75 /* Architectures should define their poll value according to the halt latency */
76 unsigned int halt_poll_ns
= KVM_HALT_POLL_NS_DEFAULT
;
77 module_param(halt_poll_ns
, uint
, 0644);
78 EXPORT_SYMBOL_GPL(halt_poll_ns
);
80 /* Default doubles per-vcpu halt_poll_ns. */
81 unsigned int halt_poll_ns_grow
= 2;
82 module_param(halt_poll_ns_grow
, uint
, 0644);
83 EXPORT_SYMBOL_GPL(halt_poll_ns_grow
);
85 /* The start value to grow halt_poll_ns from */
86 unsigned int halt_poll_ns_grow_start
= 10000; /* 10us */
87 module_param(halt_poll_ns_grow_start
, uint
, 0644);
88 EXPORT_SYMBOL_GPL(halt_poll_ns_grow_start
);
90 /* Default resets per-vcpu halt_poll_ns . */
91 unsigned int halt_poll_ns_shrink
;
92 module_param(halt_poll_ns_shrink
, uint
, 0644);
93 EXPORT_SYMBOL_GPL(halt_poll_ns_shrink
);
98 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
101 DEFINE_SPINLOCK(kvm_lock
);
102 static DEFINE_RAW_SPINLOCK(kvm_count_lock
);
105 static cpumask_var_t cpus_hardware_enabled
;
106 static int kvm_usage_count
;
107 static atomic_t hardware_enable_failed
;
109 struct kmem_cache
*kvm_vcpu_cache
;
110 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
112 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
114 struct dentry
*kvm_debugfs_dir
;
115 EXPORT_SYMBOL_GPL(kvm_debugfs_dir
);
117 static int kvm_debugfs_num_entries
;
118 static const struct file_operations
*stat_fops_per_vm
[];
120 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
122 #ifdef CONFIG_KVM_COMPAT
123 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
125 #define KVM_COMPAT(c) .compat_ioctl = (c)
127 static long kvm_no_compat_ioctl(struct file
*file
, unsigned int ioctl
,
128 unsigned long arg
) { return -EINVAL
; }
129 #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl
131 static int hardware_enable_all(void);
132 static void hardware_disable_all(void);
134 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
136 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
, gfn_t gfn
);
138 __visible
bool kvm_rebooting
;
139 EXPORT_SYMBOL_GPL(kvm_rebooting
);
141 static bool largepages_enabled
= true;
143 #define KVM_EVENT_CREATE_VM 0
144 #define KVM_EVENT_DESTROY_VM 1
145 static void kvm_uevent_notify_change(unsigned int type
, struct kvm
*kvm
);
146 static unsigned long long kvm_createvm_count
;
147 static unsigned long long kvm_active_vms
;
149 __weak
int kvm_arch_mmu_notifier_invalidate_range(struct kvm
*kvm
,
150 unsigned long start
, unsigned long end
, bool blockable
)
155 bool kvm_is_reserved_pfn(kvm_pfn_t pfn
)
158 return PageReserved(pfn_to_page(pfn
));
164 * Switches to specified vcpu, until a matching vcpu_put()
166 void vcpu_load(struct kvm_vcpu
*vcpu
)
169 preempt_notifier_register(&vcpu
->preempt_notifier
);
170 kvm_arch_vcpu_load(vcpu
, cpu
);
173 EXPORT_SYMBOL_GPL(vcpu_load
);
175 void vcpu_put(struct kvm_vcpu
*vcpu
)
178 kvm_arch_vcpu_put(vcpu
);
179 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
182 EXPORT_SYMBOL_GPL(vcpu_put
);
184 /* TODO: merge with kvm_arch_vcpu_should_kick */
185 static bool kvm_request_needs_ipi(struct kvm_vcpu
*vcpu
, unsigned req
)
187 int mode
= kvm_vcpu_exiting_guest_mode(vcpu
);
190 * We need to wait for the VCPU to reenable interrupts and get out of
191 * READING_SHADOW_PAGE_TABLES mode.
193 if (req
& KVM_REQUEST_WAIT
)
194 return mode
!= OUTSIDE_GUEST_MODE
;
197 * Need to kick a running VCPU, but otherwise there is nothing to do.
199 return mode
== IN_GUEST_MODE
;
202 static void ack_flush(void *_completed
)
206 static inline bool kvm_kick_many_cpus(const struct cpumask
*cpus
, bool wait
)
209 cpus
= cpu_online_mask
;
211 if (cpumask_empty(cpus
))
214 smp_call_function_many(cpus
, ack_flush
, NULL
, wait
);
218 bool kvm_make_vcpus_request_mask(struct kvm
*kvm
, unsigned int req
,
219 unsigned long *vcpu_bitmap
, cpumask_var_t tmp
)
222 struct kvm_vcpu
*vcpu
;
227 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
228 if (vcpu_bitmap
&& !test_bit(i
, vcpu_bitmap
))
231 kvm_make_request(req
, vcpu
);
234 if (!(req
& KVM_REQUEST_NO_WAKEUP
) && kvm_vcpu_wake_up(vcpu
))
237 if (tmp
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
238 kvm_request_needs_ipi(vcpu
, req
))
239 __cpumask_set_cpu(cpu
, tmp
);
242 called
= kvm_kick_many_cpus(tmp
, !!(req
& KVM_REQUEST_WAIT
));
248 bool kvm_make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
253 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
255 called
= kvm_make_vcpus_request_mask(kvm
, req
, NULL
, cpus
);
257 free_cpumask_var(cpus
);
261 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
262 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
265 * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
266 * kvm_make_all_cpus_request.
268 long dirty_count
= smp_load_acquire(&kvm
->tlbs_dirty
);
271 * We want to publish modifications to the page tables before reading
272 * mode. Pairs with a memory barrier in arch-specific code.
273 * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest
274 * and smp_mb in walk_shadow_page_lockless_begin/end.
275 * - powerpc: smp_mb in kvmppc_prepare_to_enter.
277 * There is already an smp_mb__after_atomic() before
278 * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
281 if (!kvm_arch_flush_remote_tlb(kvm
)
282 || kvm_make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
283 ++kvm
->stat
.remote_tlb_flush
;
284 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
286 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs
);
289 void kvm_reload_remote_mmus(struct kvm
*kvm
)
291 kvm_make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
294 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
299 mutex_init(&vcpu
->mutex
);
304 init_swait_queue_head(&vcpu
->wq
);
305 kvm_async_pf_vcpu_init(vcpu
);
308 INIT_LIST_HEAD(&vcpu
->blocked_vcpu_list
);
310 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
315 vcpu
->run
= page_address(page
);
317 kvm_vcpu_set_in_spin_loop(vcpu
, false);
318 kvm_vcpu_set_dy_eligible(vcpu
, false);
319 vcpu
->preempted
= false;
321 r
= kvm_arch_vcpu_init(vcpu
);
327 free_page((unsigned long)vcpu
->run
);
331 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
333 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
336 * no need for rcu_read_lock as VCPU_RUN is the only place that
337 * will change the vcpu->pid pointer and on uninit all file
338 * descriptors are already gone.
340 put_pid(rcu_dereference_protected(vcpu
->pid
, 1));
341 kvm_arch_vcpu_uninit(vcpu
);
342 free_page((unsigned long)vcpu
->run
);
344 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
346 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
347 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
349 return container_of(mn
, struct kvm
, mmu_notifier
);
352 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
353 struct mm_struct
*mm
,
354 unsigned long address
,
357 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
360 idx
= srcu_read_lock(&kvm
->srcu
);
361 spin_lock(&kvm
->mmu_lock
);
362 kvm
->mmu_notifier_seq
++;
364 if (kvm_set_spte_hva(kvm
, address
, pte
))
365 kvm_flush_remote_tlbs(kvm
);
367 spin_unlock(&kvm
->mmu_lock
);
368 srcu_read_unlock(&kvm
->srcu
, idx
);
371 static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
372 const struct mmu_notifier_range
*range
)
374 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
375 int need_tlb_flush
= 0, idx
;
378 idx
= srcu_read_lock(&kvm
->srcu
);
379 spin_lock(&kvm
->mmu_lock
);
381 * The count increase must become visible at unlock time as no
382 * spte can be established without taking the mmu_lock and
383 * count is also read inside the mmu_lock critical section.
385 kvm
->mmu_notifier_count
++;
386 need_tlb_flush
= kvm_unmap_hva_range(kvm
, range
->start
, range
->end
);
387 need_tlb_flush
|= kvm
->tlbs_dirty
;
388 /* we've to flush the tlb before the pages can be freed */
390 kvm_flush_remote_tlbs(kvm
);
392 spin_unlock(&kvm
->mmu_lock
);
394 ret
= kvm_arch_mmu_notifier_invalidate_range(kvm
, range
->start
,
396 mmu_notifier_range_blockable(range
));
398 srcu_read_unlock(&kvm
->srcu
, idx
);
403 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
404 const struct mmu_notifier_range
*range
)
406 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
408 spin_lock(&kvm
->mmu_lock
);
410 * This sequence increase will notify the kvm page fault that
411 * the page that is going to be mapped in the spte could have
414 kvm
->mmu_notifier_seq
++;
417 * The above sequence increase must be visible before the
418 * below count decrease, which is ensured by the smp_wmb above
419 * in conjunction with the smp_rmb in mmu_notifier_retry().
421 kvm
->mmu_notifier_count
--;
422 spin_unlock(&kvm
->mmu_lock
);
424 BUG_ON(kvm
->mmu_notifier_count
< 0);
427 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
428 struct mm_struct
*mm
,
432 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
435 idx
= srcu_read_lock(&kvm
->srcu
);
436 spin_lock(&kvm
->mmu_lock
);
438 young
= kvm_age_hva(kvm
, start
, end
);
440 kvm_flush_remote_tlbs(kvm
);
442 spin_unlock(&kvm
->mmu_lock
);
443 srcu_read_unlock(&kvm
->srcu
, idx
);
448 static int kvm_mmu_notifier_clear_young(struct mmu_notifier
*mn
,
449 struct mm_struct
*mm
,
453 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
456 idx
= srcu_read_lock(&kvm
->srcu
);
457 spin_lock(&kvm
->mmu_lock
);
459 * Even though we do not flush TLB, this will still adversely
460 * affect performance on pre-Haswell Intel EPT, where there is
461 * no EPT Access Bit to clear so that we have to tear down EPT
462 * tables instead. If we find this unacceptable, we can always
463 * add a parameter to kvm_age_hva so that it effectively doesn't
464 * do anything on clear_young.
466 * Also note that currently we never issue secondary TLB flushes
467 * from clear_young, leaving this job up to the regular system
468 * cadence. If we find this inaccurate, we might come up with a
469 * more sophisticated heuristic later.
471 young
= kvm_age_hva(kvm
, start
, end
);
472 spin_unlock(&kvm
->mmu_lock
);
473 srcu_read_unlock(&kvm
->srcu
, idx
);
478 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
479 struct mm_struct
*mm
,
480 unsigned long address
)
482 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
485 idx
= srcu_read_lock(&kvm
->srcu
);
486 spin_lock(&kvm
->mmu_lock
);
487 young
= kvm_test_age_hva(kvm
, address
);
488 spin_unlock(&kvm
->mmu_lock
);
489 srcu_read_unlock(&kvm
->srcu
, idx
);
494 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
495 struct mm_struct
*mm
)
497 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
500 idx
= srcu_read_lock(&kvm
->srcu
);
501 kvm_arch_flush_shadow_all(kvm
);
502 srcu_read_unlock(&kvm
->srcu
, idx
);
505 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
506 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
507 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
508 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
509 .clear_young
= kvm_mmu_notifier_clear_young
,
510 .test_young
= kvm_mmu_notifier_test_young
,
511 .change_pte
= kvm_mmu_notifier_change_pte
,
512 .release
= kvm_mmu_notifier_release
,
515 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
517 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
518 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
521 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
523 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
528 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
530 static struct kvm_memslots
*kvm_alloc_memslots(void)
533 struct kvm_memslots
*slots
;
535 slots
= kvzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL_ACCOUNT
);
539 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
540 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
545 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
547 if (!memslot
->dirty_bitmap
)
550 kvfree(memslot
->dirty_bitmap
);
551 memslot
->dirty_bitmap
= NULL
;
555 * Free any memory in @free but not in @dont.
557 static void kvm_free_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
558 struct kvm_memory_slot
*dont
)
560 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
561 kvm_destroy_dirty_bitmap(free
);
563 kvm_arch_free_memslot(kvm
, free
, dont
);
568 static void kvm_free_memslots(struct kvm
*kvm
, struct kvm_memslots
*slots
)
570 struct kvm_memory_slot
*memslot
;
575 kvm_for_each_memslot(memslot
, slots
)
576 kvm_free_memslot(kvm
, memslot
, NULL
);
581 static void kvm_destroy_vm_debugfs(struct kvm
*kvm
)
585 if (!kvm
->debugfs_dentry
)
588 debugfs_remove_recursive(kvm
->debugfs_dentry
);
590 if (kvm
->debugfs_stat_data
) {
591 for (i
= 0; i
< kvm_debugfs_num_entries
; i
++)
592 kfree(kvm
->debugfs_stat_data
[i
]);
593 kfree(kvm
->debugfs_stat_data
);
597 static int kvm_create_vm_debugfs(struct kvm
*kvm
, int fd
)
599 char dir_name
[ITOA_MAX_LEN
* 2];
600 struct kvm_stat_data
*stat_data
;
601 struct kvm_stats_debugfs_item
*p
;
603 if (!debugfs_initialized())
606 snprintf(dir_name
, sizeof(dir_name
), "%d-%d", task_pid_nr(current
), fd
);
607 kvm
->debugfs_dentry
= debugfs_create_dir(dir_name
, kvm_debugfs_dir
);
609 kvm
->debugfs_stat_data
= kcalloc(kvm_debugfs_num_entries
,
610 sizeof(*kvm
->debugfs_stat_data
),
612 if (!kvm
->debugfs_stat_data
)
615 for (p
= debugfs_entries
; p
->name
; p
++) {
616 stat_data
= kzalloc(sizeof(*stat_data
), GFP_KERNEL_ACCOUNT
);
620 stat_data
->kvm
= kvm
;
621 stat_data
->offset
= p
->offset
;
622 kvm
->debugfs_stat_data
[p
- debugfs_entries
] = stat_data
;
623 debugfs_create_file(p
->name
, 0644, kvm
->debugfs_dentry
,
624 stat_data
, stat_fops_per_vm
[p
->kind
]);
629 static struct kvm
*kvm_create_vm(unsigned long type
)
632 struct kvm
*kvm
= kvm_arch_alloc_vm();
635 return ERR_PTR(-ENOMEM
);
637 spin_lock_init(&kvm
->mmu_lock
);
639 kvm
->mm
= current
->mm
;
640 kvm_eventfd_init(kvm
);
641 mutex_init(&kvm
->lock
);
642 mutex_init(&kvm
->irq_lock
);
643 mutex_init(&kvm
->slots_lock
);
644 refcount_set(&kvm
->users_count
, 1);
645 INIT_LIST_HEAD(&kvm
->devices
);
647 r
= kvm_arch_init_vm(kvm
, type
);
649 goto out_err_no_disable
;
651 r
= hardware_enable_all();
653 goto out_err_no_disable
;
655 #ifdef CONFIG_HAVE_KVM_IRQFD
656 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
659 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
662 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++) {
663 struct kvm_memslots
*slots
= kvm_alloc_memslots();
665 goto out_err_no_srcu
;
666 /* Generations must be different for each address space. */
667 slots
->generation
= i
;
668 rcu_assign_pointer(kvm
->memslots
[i
], slots
);
671 if (init_srcu_struct(&kvm
->srcu
))
672 goto out_err_no_srcu
;
673 if (init_srcu_struct(&kvm
->irq_srcu
))
674 goto out_err_no_irq_srcu
;
675 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
676 rcu_assign_pointer(kvm
->buses
[i
],
677 kzalloc(sizeof(struct kvm_io_bus
), GFP_KERNEL_ACCOUNT
));
682 r
= kvm_init_mmu_notifier(kvm
);
686 spin_lock(&kvm_lock
);
687 list_add(&kvm
->vm_list
, &vm_list
);
688 spin_unlock(&kvm_lock
);
690 preempt_notifier_inc();
695 cleanup_srcu_struct(&kvm
->irq_srcu
);
697 cleanup_srcu_struct(&kvm
->srcu
);
699 hardware_disable_all();
701 refcount_set(&kvm
->users_count
, 0);
702 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
703 kfree(kvm_get_bus(kvm
, i
));
704 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
705 kvm_free_memslots(kvm
, __kvm_memslots(kvm
, i
));
706 kvm_arch_free_vm(kvm
);
711 static void kvm_destroy_devices(struct kvm
*kvm
)
713 struct kvm_device
*dev
, *tmp
;
716 * We do not need to take the kvm->lock here, because nobody else
717 * has a reference to the struct kvm at this point and therefore
718 * cannot access the devices list anyhow.
720 list_for_each_entry_safe(dev
, tmp
, &kvm
->devices
, vm_node
) {
721 list_del(&dev
->vm_node
);
722 dev
->ops
->destroy(dev
);
726 static void kvm_destroy_vm(struct kvm
*kvm
)
729 struct mm_struct
*mm
= kvm
->mm
;
731 kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM
, kvm
);
732 kvm_destroy_vm_debugfs(kvm
);
733 kvm_arch_sync_events(kvm
);
734 spin_lock(&kvm_lock
);
735 list_del(&kvm
->vm_list
);
736 spin_unlock(&kvm_lock
);
737 kvm_free_irq_routing(kvm
);
738 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
739 struct kvm_io_bus
*bus
= kvm_get_bus(kvm
, i
);
742 kvm_io_bus_destroy(bus
);
743 kvm
->buses
[i
] = NULL
;
745 kvm_coalesced_mmio_free(kvm
);
746 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
747 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
749 kvm_arch_flush_shadow_all(kvm
);
751 kvm_arch_destroy_vm(kvm
);
752 kvm_destroy_devices(kvm
);
753 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
754 kvm_free_memslots(kvm
, __kvm_memslots(kvm
, i
));
755 cleanup_srcu_struct(&kvm
->irq_srcu
);
756 cleanup_srcu_struct(&kvm
->srcu
);
757 kvm_arch_free_vm(kvm
);
758 preempt_notifier_dec();
759 hardware_disable_all();
763 void kvm_get_kvm(struct kvm
*kvm
)
765 refcount_inc(&kvm
->users_count
);
767 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
769 void kvm_put_kvm(struct kvm
*kvm
)
771 if (refcount_dec_and_test(&kvm
->users_count
))
774 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
777 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
779 struct kvm
*kvm
= filp
->private_data
;
781 kvm_irqfd_release(kvm
);
788 * Allocation size is twice as large as the actual dirty bitmap size.
789 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
791 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
793 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
795 memslot
->dirty_bitmap
= kvzalloc(dirty_bytes
, GFP_KERNEL_ACCOUNT
);
796 if (!memslot
->dirty_bitmap
)
803 * Insert memslot and re-sort memslots based on their GFN,
804 * so binary search could be used to lookup GFN.
805 * Sorting algorithm takes advantage of having initially
806 * sorted array and known changed memslot position.
808 static void update_memslots(struct kvm_memslots
*slots
,
809 struct kvm_memory_slot
*new,
810 enum kvm_mr_change change
)
813 int i
= slots
->id_to_index
[id
];
814 struct kvm_memory_slot
*mslots
= slots
->memslots
;
816 WARN_ON(mslots
[i
].id
!= id
);
820 WARN_ON(mslots
[i
].npages
|| !new->npages
);
824 WARN_ON(new->npages
|| !mslots
[i
].npages
);
830 while (i
< KVM_MEM_SLOTS_NUM
- 1 &&
831 new->base_gfn
<= mslots
[i
+ 1].base_gfn
) {
832 if (!mslots
[i
+ 1].npages
)
834 mslots
[i
] = mslots
[i
+ 1];
835 slots
->id_to_index
[mslots
[i
].id
] = i
;
840 * The ">=" is needed when creating a slot with base_gfn == 0,
841 * so that it moves before all those with base_gfn == npages == 0.
843 * On the other hand, if new->npages is zero, the above loop has
844 * already left i pointing to the beginning of the empty part of
845 * mslots, and the ">=" would move the hole backwards in this
846 * case---which is wrong. So skip the loop when deleting a slot.
850 new->base_gfn
>= mslots
[i
- 1].base_gfn
) {
851 mslots
[i
] = mslots
[i
- 1];
852 slots
->id_to_index
[mslots
[i
].id
] = i
;
856 WARN_ON_ONCE(i
!= slots
->used_slots
);
859 slots
->id_to_index
[mslots
[i
].id
] = i
;
862 static int check_memory_region_flags(const struct kvm_userspace_memory_region
*mem
)
864 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
866 #ifdef __KVM_HAVE_READONLY_MEM
867 valid_flags
|= KVM_MEM_READONLY
;
870 if (mem
->flags
& ~valid_flags
)
876 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
877 int as_id
, struct kvm_memslots
*slots
)
879 struct kvm_memslots
*old_memslots
= __kvm_memslots(kvm
, as_id
);
880 u64 gen
= old_memslots
->generation
;
882 WARN_ON(gen
& KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS
);
883 slots
->generation
= gen
| KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS
;
885 rcu_assign_pointer(kvm
->memslots
[as_id
], slots
);
886 synchronize_srcu_expedited(&kvm
->srcu
);
889 * Increment the new memslot generation a second time, dropping the
890 * update in-progress flag and incrementing then generation based on
891 * the number of address spaces. This provides a unique and easily
892 * identifiable generation number while the memslots are in flux.
894 gen
= slots
->generation
& ~KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS
;
897 * Generations must be unique even across address spaces. We do not need
898 * a global counter for that, instead the generation space is evenly split
899 * across address spaces. For example, with two address spaces, address
900 * space 0 will use generations 0, 2, 4, ... while address space 1 will
901 * use generations 1, 3, 5, ...
903 gen
+= KVM_ADDRESS_SPACE_NUM
;
905 kvm_arch_memslots_updated(kvm
, gen
);
907 slots
->generation
= gen
;
913 * Allocate some memory and give it an address in the guest physical address
916 * Discontiguous memory is allowed, mostly for framebuffers.
918 * Must be called holding kvm->slots_lock for write.
920 int __kvm_set_memory_region(struct kvm
*kvm
,
921 const struct kvm_userspace_memory_region
*mem
)
925 unsigned long npages
;
926 struct kvm_memory_slot
*slot
;
927 struct kvm_memory_slot old
, new;
928 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
930 enum kvm_mr_change change
;
932 r
= check_memory_region_flags(mem
);
937 as_id
= mem
->slot
>> 16;
940 /* General sanity checks */
941 if (mem
->memory_size
& (PAGE_SIZE
- 1))
943 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
945 /* We can read the guest memory with __xxx_user() later on. */
946 if ((id
< KVM_USER_MEM_SLOTS
) &&
947 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
948 !access_ok((void __user
*)(unsigned long)mem
->userspace_addr
,
951 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_MEM_SLOTS_NUM
)
953 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
956 slot
= id_to_memslot(__kvm_memslots(kvm
, as_id
), id
);
957 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
958 npages
= mem
->memory_size
>> PAGE_SHIFT
;
960 if (npages
> KVM_MEM_MAX_NR_PAGES
)
966 new.base_gfn
= base_gfn
;
968 new.flags
= mem
->flags
;
972 change
= KVM_MR_CREATE
;
973 else { /* Modify an existing slot. */
974 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
975 (npages
!= old
.npages
) ||
976 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
979 if (base_gfn
!= old
.base_gfn
)
980 change
= KVM_MR_MOVE
;
981 else if (new.flags
!= old
.flags
)
982 change
= KVM_MR_FLAGS_ONLY
;
983 else { /* Nothing to change. */
992 change
= KVM_MR_DELETE
;
997 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
998 /* Check for overlaps */
1000 kvm_for_each_memslot(slot
, __kvm_memslots(kvm
, as_id
)) {
1003 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
1004 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
1009 /* Free page dirty bitmap if unneeded */
1010 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
1011 new.dirty_bitmap
= NULL
;
1014 if (change
== KVM_MR_CREATE
) {
1015 new.userspace_addr
= mem
->userspace_addr
;
1017 if (kvm_arch_create_memslot(kvm
, &new, npages
))
1021 /* Allocate page dirty bitmap if needed */
1022 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
1023 if (kvm_create_dirty_bitmap(&new) < 0)
1027 slots
= kvzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL_ACCOUNT
);
1030 memcpy(slots
, __kvm_memslots(kvm
, as_id
), sizeof(struct kvm_memslots
));
1032 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
1033 slot
= id_to_memslot(slots
, id
);
1034 slot
->flags
|= KVM_MEMSLOT_INVALID
;
1036 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
1038 /* From this point no new shadow pages pointing to a deleted,
1039 * or moved, memslot will be created.
1041 * validation of sp->gfn happens in:
1042 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
1043 * - kvm_is_visible_gfn (mmu_check_roots)
1045 kvm_arch_flush_shadow_memslot(kvm
, slot
);
1048 * We can re-use the old_memslots from above, the only difference
1049 * from the currently installed memslots is the invalid flag. This
1050 * will get overwritten by update_memslots anyway.
1052 slots
= old_memslots
;
1055 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
1059 /* actual memory is freed via old in kvm_free_memslot below */
1060 if (change
== KVM_MR_DELETE
) {
1061 new.dirty_bitmap
= NULL
;
1062 memset(&new.arch
, 0, sizeof(new.arch
));
1065 update_memslots(slots
, &new, change
);
1066 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
1068 kvm_arch_commit_memory_region(kvm
, mem
, &old
, &new, change
);
1070 kvm_free_memslot(kvm
, &old
, &new);
1071 kvfree(old_memslots
);
1077 kvm_free_memslot(kvm
, &new, &old
);
1081 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
1083 int kvm_set_memory_region(struct kvm
*kvm
,
1084 const struct kvm_userspace_memory_region
*mem
)
1088 mutex_lock(&kvm
->slots_lock
);
1089 r
= __kvm_set_memory_region(kvm
, mem
);
1090 mutex_unlock(&kvm
->slots_lock
);
1093 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
1095 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
1096 struct kvm_userspace_memory_region
*mem
)
1098 if ((u16
)mem
->slot
>= KVM_USER_MEM_SLOTS
)
1101 return kvm_set_memory_region(kvm
, mem
);
1104 int kvm_get_dirty_log(struct kvm
*kvm
,
1105 struct kvm_dirty_log
*log
, int *is_dirty
)
1107 struct kvm_memslots
*slots
;
1108 struct kvm_memory_slot
*memslot
;
1111 unsigned long any
= 0;
1113 as_id
= log
->slot
>> 16;
1114 id
= (u16
)log
->slot
;
1115 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1118 slots
= __kvm_memslots(kvm
, as_id
);
1119 memslot
= id_to_memslot(slots
, id
);
1120 if (!memslot
->dirty_bitmap
)
1123 n
= kvm_dirty_bitmap_bytes(memslot
);
1125 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
1126 any
= memslot
->dirty_bitmap
[i
];
1128 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
1135 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
1137 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1139 * kvm_get_dirty_log_protect - get a snapshot of dirty pages
1140 * and reenable dirty page tracking for the corresponding pages.
1141 * @kvm: pointer to kvm instance
1142 * @log: slot id and address to which we copy the log
1143 * @flush: true if TLB flush is needed by caller
1145 * We need to keep it in mind that VCPU threads can write to the bitmap
1146 * concurrently. So, to avoid losing track of dirty pages we keep the
1149 * 1. Take a snapshot of the bit and clear it if needed.
1150 * 2. Write protect the corresponding page.
1151 * 3. Copy the snapshot to the userspace.
1152 * 4. Upon return caller flushes TLB's if needed.
1154 * Between 2 and 4, the guest may write to the page using the remaining TLB
1155 * entry. This is not a problem because the page is reported dirty using
1156 * the snapshot taken before and step 4 ensures that writes done after
1157 * exiting to userspace will be logged for the next call.
1160 int kvm_get_dirty_log_protect(struct kvm
*kvm
,
1161 struct kvm_dirty_log
*log
, bool *flush
)
1163 struct kvm_memslots
*slots
;
1164 struct kvm_memory_slot
*memslot
;
1167 unsigned long *dirty_bitmap
;
1168 unsigned long *dirty_bitmap_buffer
;
1170 as_id
= log
->slot
>> 16;
1171 id
= (u16
)log
->slot
;
1172 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1175 slots
= __kvm_memslots(kvm
, as_id
);
1176 memslot
= id_to_memslot(slots
, id
);
1178 dirty_bitmap
= memslot
->dirty_bitmap
;
1182 n
= kvm_dirty_bitmap_bytes(memslot
);
1184 if (kvm
->manual_dirty_log_protect
) {
1186 * Unlike kvm_get_dirty_log, we always return false in *flush,
1187 * because no flush is needed until KVM_CLEAR_DIRTY_LOG. There
1188 * is some code duplication between this function and
1189 * kvm_get_dirty_log, but hopefully all architecture
1190 * transition to kvm_get_dirty_log_protect and kvm_get_dirty_log
1191 * can be eliminated.
1193 dirty_bitmap_buffer
= dirty_bitmap
;
1195 dirty_bitmap_buffer
= kvm_second_dirty_bitmap(memslot
);
1196 memset(dirty_bitmap_buffer
, 0, n
);
1198 spin_lock(&kvm
->mmu_lock
);
1199 for (i
= 0; i
< n
/ sizeof(long); i
++) {
1203 if (!dirty_bitmap
[i
])
1207 mask
= xchg(&dirty_bitmap
[i
], 0);
1208 dirty_bitmap_buffer
[i
] = mask
;
1210 offset
= i
* BITS_PER_LONG
;
1211 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
,
1214 spin_unlock(&kvm
->mmu_lock
);
1217 if (copy_to_user(log
->dirty_bitmap
, dirty_bitmap_buffer
, n
))
1221 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect
);
1224 * kvm_clear_dirty_log_protect - clear dirty bits in the bitmap
1225 * and reenable dirty page tracking for the corresponding pages.
1226 * @kvm: pointer to kvm instance
1227 * @log: slot id and address from which to fetch the bitmap of dirty pages
1228 * @flush: true if TLB flush is needed by caller
1230 int kvm_clear_dirty_log_protect(struct kvm
*kvm
,
1231 struct kvm_clear_dirty_log
*log
, bool *flush
)
1233 struct kvm_memslots
*slots
;
1234 struct kvm_memory_slot
*memslot
;
1238 unsigned long *dirty_bitmap
;
1239 unsigned long *dirty_bitmap_buffer
;
1241 as_id
= log
->slot
>> 16;
1242 id
= (u16
)log
->slot
;
1243 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1246 if (log
->first_page
& 63)
1249 slots
= __kvm_memslots(kvm
, as_id
);
1250 memslot
= id_to_memslot(slots
, id
);
1252 dirty_bitmap
= memslot
->dirty_bitmap
;
1256 n
= ALIGN(log
->num_pages
, BITS_PER_LONG
) / 8;
1258 if (log
->first_page
> memslot
->npages
||
1259 log
->num_pages
> memslot
->npages
- log
->first_page
||
1260 (log
->num_pages
< memslot
->npages
- log
->first_page
&& (log
->num_pages
& 63)))
1264 dirty_bitmap_buffer
= kvm_second_dirty_bitmap(memslot
);
1265 if (copy_from_user(dirty_bitmap_buffer
, log
->dirty_bitmap
, n
))
1268 spin_lock(&kvm
->mmu_lock
);
1269 for (offset
= log
->first_page
, i
= offset
/ BITS_PER_LONG
,
1270 n
= DIV_ROUND_UP(log
->num_pages
, BITS_PER_LONG
); n
--;
1271 i
++, offset
+= BITS_PER_LONG
) {
1272 unsigned long mask
= *dirty_bitmap_buffer
++;
1273 atomic_long_t
*p
= (atomic_long_t
*) &dirty_bitmap
[i
];
1277 mask
&= atomic_long_fetch_andnot(mask
, p
);
1280 * mask contains the bits that really have been cleared. This
1281 * never includes any bits beyond the length of the memslot (if
1282 * the length is not aligned to 64 pages), therefore it is not
1283 * a problem if userspace sets them in log->dirty_bitmap.
1287 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
,
1291 spin_unlock(&kvm
->mmu_lock
);
1295 EXPORT_SYMBOL_GPL(kvm_clear_dirty_log_protect
);
1298 bool kvm_largepages_enabled(void)
1300 return largepages_enabled
;
1303 void kvm_disable_largepages(void)
1305 largepages_enabled
= false;
1307 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
1309 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1311 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1313 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1315 struct kvm_memory_slot
*kvm_vcpu_gfn_to_memslot(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1317 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu
), gfn
);
1320 bool kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1322 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1324 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1325 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1330 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1332 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1334 struct vm_area_struct
*vma
;
1335 unsigned long addr
, size
;
1339 addr
= gfn_to_hva(kvm
, gfn
);
1340 if (kvm_is_error_hva(addr
))
1343 down_read(¤t
->mm
->mmap_sem
);
1344 vma
= find_vma(current
->mm
, addr
);
1348 size
= vma_kernel_pagesize(vma
);
1351 up_read(¤t
->mm
->mmap_sem
);
1356 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1358 return slot
->flags
& KVM_MEM_READONLY
;
1361 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1362 gfn_t
*nr_pages
, bool write
)
1364 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1365 return KVM_HVA_ERR_BAD
;
1367 if (memslot_is_readonly(slot
) && write
)
1368 return KVM_HVA_ERR_RO_BAD
;
1371 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1373 return __gfn_to_hva_memslot(slot
, gfn
);
1376 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1379 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1382 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1385 return gfn_to_hva_many(slot
, gfn
, NULL
);
1387 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1389 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1391 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1393 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1395 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1397 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
, NULL
);
1399 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva
);
1402 * Return the hva of a @gfn and the R/W attribute if possible.
1404 * @slot: the kvm_memory_slot which contains @gfn
1405 * @gfn: the gfn to be translated
1406 * @writable: used to return the read/write attribute of the @slot if the hva
1407 * is valid and @writable is not NULL
1409 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot
*slot
,
1410 gfn_t gfn
, bool *writable
)
1412 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1414 if (!kvm_is_error_hva(hva
) && writable
)
1415 *writable
= !memslot_is_readonly(slot
);
1420 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1422 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1424 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1427 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu
*vcpu
, gfn_t gfn
, bool *writable
)
1429 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1431 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1434 static inline int check_user_page_hwpoison(unsigned long addr
)
1436 int rc
, flags
= FOLL_HWPOISON
| FOLL_WRITE
;
1438 rc
= get_user_pages(addr
, 1, flags
, NULL
, NULL
);
1439 return rc
== -EHWPOISON
;
1443 * The fast path to get the writable pfn which will be stored in @pfn,
1444 * true indicates success, otherwise false is returned. It's also the
1445 * only part that runs if we can are in atomic context.
1447 static bool hva_to_pfn_fast(unsigned long addr
, bool write_fault
,
1448 bool *writable
, kvm_pfn_t
*pfn
)
1450 struct page
*page
[1];
1454 * Fast pin a writable pfn only if it is a write fault request
1455 * or the caller allows to map a writable pfn for a read fault
1458 if (!(write_fault
|| writable
))
1461 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1463 *pfn
= page_to_pfn(page
[0]);
1474 * The slow path to get the pfn of the specified host virtual address,
1475 * 1 indicates success, -errno is returned if error is detected.
1477 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1478 bool *writable
, kvm_pfn_t
*pfn
)
1480 unsigned int flags
= FOLL_HWPOISON
;
1487 *writable
= write_fault
;
1490 flags
|= FOLL_WRITE
;
1492 flags
|= FOLL_NOWAIT
;
1494 npages
= get_user_pages_unlocked(addr
, 1, &page
, flags
);
1498 /* map read fault as writable if possible */
1499 if (unlikely(!write_fault
) && writable
) {
1502 if (__get_user_pages_fast(addr
, 1, 1, &wpage
) == 1) {
1508 *pfn
= page_to_pfn(page
);
1512 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1514 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1517 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1523 static int hva_to_pfn_remapped(struct vm_area_struct
*vma
,
1524 unsigned long addr
, bool *async
,
1525 bool write_fault
, bool *writable
,
1531 r
= follow_pfn(vma
, addr
, &pfn
);
1534 * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
1535 * not call the fault handler, so do it here.
1537 bool unlocked
= false;
1538 r
= fixup_user_fault(current
, current
->mm
, addr
,
1539 (write_fault
? FAULT_FLAG_WRITE
: 0),
1546 r
= follow_pfn(vma
, addr
, &pfn
);
1556 * Get a reference here because callers of *hva_to_pfn* and
1557 * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the
1558 * returned pfn. This is only needed if the VMA has VM_MIXEDMAP
1559 * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will
1560 * simply do nothing for reserved pfns.
1562 * Whoever called remap_pfn_range is also going to call e.g.
1563 * unmap_mapping_range before the underlying pages are freed,
1564 * causing a call to our MMU notifier.
1573 * Pin guest page in memory and return its pfn.
1574 * @addr: host virtual address which maps memory to the guest
1575 * @atomic: whether this function can sleep
1576 * @async: whether this function need to wait IO complete if the
1577 * host page is not in the memory
1578 * @write_fault: whether we should get a writable host page
1579 * @writable: whether it allows to map a writable host page for !@write_fault
1581 * The function will map a writable host page for these two cases:
1582 * 1): @write_fault = true
1583 * 2): @write_fault = false && @writable, @writable will tell the caller
1584 * whether the mapping is writable.
1586 static kvm_pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1587 bool write_fault
, bool *writable
)
1589 struct vm_area_struct
*vma
;
1593 /* we can do it either atomically or asynchronously, not both */
1594 BUG_ON(atomic
&& async
);
1596 if (hva_to_pfn_fast(addr
, write_fault
, writable
, &pfn
))
1600 return KVM_PFN_ERR_FAULT
;
1602 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1606 down_read(¤t
->mm
->mmap_sem
);
1607 if (npages
== -EHWPOISON
||
1608 (!async
&& check_user_page_hwpoison(addr
))) {
1609 pfn
= KVM_PFN_ERR_HWPOISON
;
1614 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1617 pfn
= KVM_PFN_ERR_FAULT
;
1618 else if (vma
->vm_flags
& (VM_IO
| VM_PFNMAP
)) {
1619 r
= hva_to_pfn_remapped(vma
, addr
, async
, write_fault
, writable
, &pfn
);
1623 pfn
= KVM_PFN_ERR_FAULT
;
1625 if (async
&& vma_is_valid(vma
, write_fault
))
1627 pfn
= KVM_PFN_ERR_FAULT
;
1630 up_read(¤t
->mm
->mmap_sem
);
1634 kvm_pfn_t
__gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1635 bool atomic
, bool *async
, bool write_fault
,
1638 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1640 if (addr
== KVM_HVA_ERR_RO_BAD
) {
1643 return KVM_PFN_ERR_RO_FAULT
;
1646 if (kvm_is_error_hva(addr
)) {
1649 return KVM_PFN_NOSLOT
;
1652 /* Do not map writable pfn in the readonly memslot. */
1653 if (writable
&& memslot_is_readonly(slot
)) {
1658 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1661 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot
);
1663 kvm_pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1666 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
, false, NULL
,
1667 write_fault
, writable
);
1669 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1671 kvm_pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1673 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1675 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot
);
1677 kvm_pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1679 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1681 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1683 kvm_pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1685 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm
, gfn
), gfn
);
1687 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1689 kvm_pfn_t
kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1691 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1693 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic
);
1695 kvm_pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1697 return gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
);
1699 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1701 kvm_pfn_t
kvm_vcpu_gfn_to_pfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1703 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1705 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn
);
1707 int gfn_to_page_many_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1708 struct page
**pages
, int nr_pages
)
1713 addr
= gfn_to_hva_many(slot
, gfn
, &entry
);
1714 if (kvm_is_error_hva(addr
))
1717 if (entry
< nr_pages
)
1720 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1722 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1724 static struct page
*kvm_pfn_to_page(kvm_pfn_t pfn
)
1726 if (is_error_noslot_pfn(pfn
))
1727 return KVM_ERR_PTR_BAD_PAGE
;
1729 if (kvm_is_reserved_pfn(pfn
)) {
1731 return KVM_ERR_PTR_BAD_PAGE
;
1734 return pfn_to_page(pfn
);
1737 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1741 pfn
= gfn_to_pfn(kvm
, gfn
);
1743 return kvm_pfn_to_page(pfn
);
1745 EXPORT_SYMBOL_GPL(gfn_to_page
);
1747 static int __kvm_map_gfn(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1748 struct kvm_host_map
*map
)
1752 struct page
*page
= KVM_UNMAPPED_PAGE
;
1757 pfn
= gfn_to_pfn_memslot(slot
, gfn
);
1758 if (is_error_noslot_pfn(pfn
))
1761 if (pfn_valid(pfn
)) {
1762 page
= pfn_to_page(pfn
);
1764 #ifdef CONFIG_HAS_IOMEM
1766 hva
= memremap(pfn_to_hpa(pfn
), PAGE_SIZE
, MEMREMAP_WB
);
1781 int kvm_vcpu_map(struct kvm_vcpu
*vcpu
, gfn_t gfn
, struct kvm_host_map
*map
)
1783 return __kvm_map_gfn(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
, map
);
1785 EXPORT_SYMBOL_GPL(kvm_vcpu_map
);
1787 void kvm_vcpu_unmap(struct kvm_vcpu
*vcpu
, struct kvm_host_map
*map
,
1798 #ifdef CONFIG_HAS_IOMEM
1804 kvm_vcpu_mark_page_dirty(vcpu
, map
->gfn
);
1805 kvm_release_pfn_dirty(map
->pfn
);
1807 kvm_release_pfn_clean(map
->pfn
);
1813 EXPORT_SYMBOL_GPL(kvm_vcpu_unmap
);
1815 struct page
*kvm_vcpu_gfn_to_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1819 pfn
= kvm_vcpu_gfn_to_pfn(vcpu
, gfn
);
1821 return kvm_pfn_to_page(pfn
);
1823 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page
);
1825 void kvm_release_page_clean(struct page
*page
)
1827 WARN_ON(is_error_page(page
));
1829 kvm_release_pfn_clean(page_to_pfn(page
));
1831 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1833 void kvm_release_pfn_clean(kvm_pfn_t pfn
)
1835 if (!is_error_noslot_pfn(pfn
) && !kvm_is_reserved_pfn(pfn
))
1836 put_page(pfn_to_page(pfn
));
1838 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1840 void kvm_release_page_dirty(struct page
*page
)
1842 WARN_ON(is_error_page(page
));
1844 kvm_release_pfn_dirty(page_to_pfn(page
));
1846 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1848 void kvm_release_pfn_dirty(kvm_pfn_t pfn
)
1850 kvm_set_pfn_dirty(pfn
);
1851 kvm_release_pfn_clean(pfn
);
1853 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1855 void kvm_set_pfn_dirty(kvm_pfn_t pfn
)
1857 if (!kvm_is_reserved_pfn(pfn
)) {
1858 struct page
*page
= pfn_to_page(pfn
);
1860 if (!PageReserved(page
))
1864 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1866 void kvm_set_pfn_accessed(kvm_pfn_t pfn
)
1868 if (!kvm_is_reserved_pfn(pfn
))
1869 mark_page_accessed(pfn_to_page(pfn
));
1871 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1873 void kvm_get_pfn(kvm_pfn_t pfn
)
1875 if (!kvm_is_reserved_pfn(pfn
))
1876 get_page(pfn_to_page(pfn
));
1878 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1880 static int next_segment(unsigned long len
, int offset
)
1882 if (len
> PAGE_SIZE
- offset
)
1883 return PAGE_SIZE
- offset
;
1888 static int __kvm_read_guest_page(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1889 void *data
, int offset
, int len
)
1894 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1895 if (kvm_is_error_hva(addr
))
1897 r
= __copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1903 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1906 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1908 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1910 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1912 int kvm_vcpu_read_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
, void *data
,
1913 int offset
, int len
)
1915 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1917 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1919 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page
);
1921 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1923 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1925 int offset
= offset_in_page(gpa
);
1928 while ((seg
= next_segment(len
, offset
)) != 0) {
1929 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1939 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1941 int kvm_vcpu_read_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, void *data
, unsigned long len
)
1943 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1945 int offset
= offset_in_page(gpa
);
1948 while ((seg
= next_segment(len
, offset
)) != 0) {
1949 ret
= kvm_vcpu_read_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1959 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest
);
1961 static int __kvm_read_guest_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1962 void *data
, int offset
, unsigned long len
)
1967 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1968 if (kvm_is_error_hva(addr
))
1970 pagefault_disable();
1971 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1978 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1981 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1982 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1983 int offset
= offset_in_page(gpa
);
1985 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1987 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic
);
1989 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
1990 void *data
, unsigned long len
)
1992 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1993 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1994 int offset
= offset_in_page(gpa
);
1996 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1998 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic
);
2000 static int __kvm_write_guest_page(struct kvm_memory_slot
*memslot
, gfn_t gfn
,
2001 const void *data
, int offset
, int len
)
2006 addr
= gfn_to_hva_memslot(memslot
, gfn
);
2007 if (kvm_is_error_hva(addr
))
2009 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
2012 mark_page_dirty_in_slot(memslot
, gfn
);
2016 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
,
2017 const void *data
, int offset
, int len
)
2019 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
2021 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
2023 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
2025 int kvm_vcpu_write_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
,
2026 const void *data
, int offset
, int len
)
2028 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2030 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
2032 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page
);
2034 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
2037 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2039 int offset
= offset_in_page(gpa
);
2042 while ((seg
= next_segment(len
, offset
)) != 0) {
2043 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
2053 EXPORT_SYMBOL_GPL(kvm_write_guest
);
2055 int kvm_vcpu_write_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, const void *data
,
2058 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2060 int offset
= offset_in_page(gpa
);
2063 while ((seg
= next_segment(len
, offset
)) != 0) {
2064 ret
= kvm_vcpu_write_guest_page(vcpu
, gfn
, data
, offset
, seg
);
2074 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest
);
2076 static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots
*slots
,
2077 struct gfn_to_hva_cache
*ghc
,
2078 gpa_t gpa
, unsigned long len
)
2080 int offset
= offset_in_page(gpa
);
2081 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
2082 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
2083 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
2084 gfn_t nr_pages_avail
;
2085 int r
= start_gfn
<= end_gfn
? 0 : -EINVAL
;
2088 ghc
->generation
= slots
->generation
;
2090 ghc
->hva
= KVM_HVA_ERR_BAD
;
2093 * If the requested region crosses two memslots, we still
2094 * verify that the entire region is valid here.
2096 while (!r
&& start_gfn
<= end_gfn
) {
2097 ghc
->memslot
= __gfn_to_memslot(slots
, start_gfn
);
2098 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
2100 if (kvm_is_error_hva(ghc
->hva
))
2102 start_gfn
+= nr_pages_avail
;
2105 /* Use the slow path for cross page reads and writes. */
2106 if (!r
&& nr_pages_needed
== 1)
2109 ghc
->memslot
= NULL
;
2114 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2115 gpa_t gpa
, unsigned long len
)
2117 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
2118 return __kvm_gfn_to_hva_cache_init(slots
, ghc
, gpa
, len
);
2120 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
2122 int kvm_write_guest_offset_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2123 void *data
, unsigned int offset
,
2126 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
2128 gpa_t gpa
= ghc
->gpa
+ offset
;
2130 BUG_ON(len
+ offset
> ghc
->len
);
2132 if (slots
->generation
!= ghc
->generation
)
2133 __kvm_gfn_to_hva_cache_init(slots
, ghc
, ghc
->gpa
, ghc
->len
);
2135 if (unlikely(!ghc
->memslot
))
2136 return kvm_write_guest(kvm
, gpa
, data
, len
);
2138 if (kvm_is_error_hva(ghc
->hva
))
2141 r
= __copy_to_user((void __user
*)ghc
->hva
+ offset
, data
, len
);
2144 mark_page_dirty_in_slot(ghc
->memslot
, gpa
>> PAGE_SHIFT
);
2148 EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached
);
2150 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2151 void *data
, unsigned long len
)
2153 return kvm_write_guest_offset_cached(kvm
, ghc
, data
, 0, len
);
2155 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
2157 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2158 void *data
, unsigned long len
)
2160 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
2163 BUG_ON(len
> ghc
->len
);
2165 if (slots
->generation
!= ghc
->generation
)
2166 __kvm_gfn_to_hva_cache_init(slots
, ghc
, ghc
->gpa
, ghc
->len
);
2168 if (unlikely(!ghc
->memslot
))
2169 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
2171 if (kvm_is_error_hva(ghc
->hva
))
2174 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
2180 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
2182 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
2184 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2186 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
2188 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
2190 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
2192 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2194 int offset
= offset_in_page(gpa
);
2197 while ((seg
= next_segment(len
, offset
)) != 0) {
2198 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
2207 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
2209 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
,
2212 if (memslot
&& memslot
->dirty_bitmap
) {
2213 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
2215 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
2219 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
2221 struct kvm_memory_slot
*memslot
;
2223 memslot
= gfn_to_memslot(kvm
, gfn
);
2224 mark_page_dirty_in_slot(memslot
, gfn
);
2226 EXPORT_SYMBOL_GPL(mark_page_dirty
);
2228 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
2230 struct kvm_memory_slot
*memslot
;
2232 memslot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2233 mark_page_dirty_in_slot(memslot
, gfn
);
2235 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty
);
2237 void kvm_sigset_activate(struct kvm_vcpu
*vcpu
)
2239 if (!vcpu
->sigset_active
)
2243 * This does a lockless modification of ->real_blocked, which is fine
2244 * because, only current can change ->real_blocked and all readers of
2245 * ->real_blocked don't care as long ->real_blocked is always a subset
2248 sigprocmask(SIG_SETMASK
, &vcpu
->sigset
, ¤t
->real_blocked
);
2251 void kvm_sigset_deactivate(struct kvm_vcpu
*vcpu
)
2253 if (!vcpu
->sigset_active
)
2256 sigprocmask(SIG_SETMASK
, ¤t
->real_blocked
, NULL
);
2257 sigemptyset(¤t
->real_blocked
);
2260 static void grow_halt_poll_ns(struct kvm_vcpu
*vcpu
)
2262 unsigned int old
, val
, grow
, grow_start
;
2264 old
= val
= vcpu
->halt_poll_ns
;
2265 grow_start
= READ_ONCE(halt_poll_ns_grow_start
);
2266 grow
= READ_ONCE(halt_poll_ns_grow
);
2271 if (val
< grow_start
)
2274 if (val
> halt_poll_ns
)
2277 vcpu
->halt_poll_ns
= val
;
2279 trace_kvm_halt_poll_ns_grow(vcpu
->vcpu_id
, val
, old
);
2282 static void shrink_halt_poll_ns(struct kvm_vcpu
*vcpu
)
2284 unsigned int old
, val
, shrink
;
2286 old
= val
= vcpu
->halt_poll_ns
;
2287 shrink
= READ_ONCE(halt_poll_ns_shrink
);
2293 vcpu
->halt_poll_ns
= val
;
2294 trace_kvm_halt_poll_ns_shrink(vcpu
->vcpu_id
, val
, old
);
2297 static int kvm_vcpu_check_block(struct kvm_vcpu
*vcpu
)
2300 int idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
2302 if (kvm_arch_vcpu_runnable(vcpu
)) {
2303 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
2306 if (kvm_cpu_has_pending_timer(vcpu
))
2308 if (signal_pending(current
))
2313 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
2318 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
2320 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
2323 DECLARE_SWAITQUEUE(wait
);
2324 bool waited
= false;
2327 start
= cur
= ktime_get();
2328 if (vcpu
->halt_poll_ns
&& !kvm_arch_no_poll(vcpu
)) {
2329 ktime_t stop
= ktime_add_ns(ktime_get(), vcpu
->halt_poll_ns
);
2331 ++vcpu
->stat
.halt_attempted_poll
;
2334 * This sets KVM_REQ_UNHALT if an interrupt
2337 if (kvm_vcpu_check_block(vcpu
) < 0) {
2338 ++vcpu
->stat
.halt_successful_poll
;
2339 if (!vcpu_valid_wakeup(vcpu
))
2340 ++vcpu
->stat
.halt_poll_invalid
;
2344 } while (single_task_running() && ktime_before(cur
, stop
));
2347 kvm_arch_vcpu_blocking(vcpu
);
2350 prepare_to_swait_exclusive(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
2352 if (kvm_vcpu_check_block(vcpu
) < 0)
2359 finish_swait(&vcpu
->wq
, &wait
);
2362 kvm_arch_vcpu_unblocking(vcpu
);
2364 block_ns
= ktime_to_ns(cur
) - ktime_to_ns(start
);
2366 if (!vcpu_valid_wakeup(vcpu
))
2367 shrink_halt_poll_ns(vcpu
);
2368 else if (halt_poll_ns
) {
2369 if (block_ns
<= vcpu
->halt_poll_ns
)
2371 /* we had a long block, shrink polling */
2372 else if (vcpu
->halt_poll_ns
&& block_ns
> halt_poll_ns
)
2373 shrink_halt_poll_ns(vcpu
);
2374 /* we had a short halt and our poll time is too small */
2375 else if (vcpu
->halt_poll_ns
< halt_poll_ns
&&
2376 block_ns
< halt_poll_ns
)
2377 grow_halt_poll_ns(vcpu
);
2379 vcpu
->halt_poll_ns
= 0;
2381 trace_kvm_vcpu_wakeup(block_ns
, waited
, vcpu_valid_wakeup(vcpu
));
2382 kvm_arch_vcpu_block_finish(vcpu
);
2384 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
2386 bool kvm_vcpu_wake_up(struct kvm_vcpu
*vcpu
)
2388 struct swait_queue_head
*wqp
;
2390 wqp
= kvm_arch_vcpu_wq(vcpu
);
2391 if (swq_has_sleeper(wqp
)) {
2393 ++vcpu
->stat
.halt_wakeup
;
2399 EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up
);
2403 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2405 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
2408 int cpu
= vcpu
->cpu
;
2410 if (kvm_vcpu_wake_up(vcpu
))
2414 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
2415 if (kvm_arch_vcpu_should_kick(vcpu
))
2416 smp_send_reschedule(cpu
);
2419 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
2420 #endif /* !CONFIG_S390 */
2422 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
2425 struct task_struct
*task
= NULL
;
2429 pid
= rcu_dereference(target
->pid
);
2431 task
= get_pid_task(pid
, PIDTYPE_PID
);
2435 ret
= yield_to(task
, 1);
2436 put_task_struct(task
);
2440 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
2443 * Helper that checks whether a VCPU is eligible for directed yield.
2444 * Most eligible candidate to yield is decided by following heuristics:
2446 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2447 * (preempted lock holder), indicated by @in_spin_loop.
2448 * Set at the beiginning and cleared at the end of interception/PLE handler.
2450 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2451 * chance last time (mostly it has become eligible now since we have probably
2452 * yielded to lockholder in last iteration. This is done by toggling
2453 * @dy_eligible each time a VCPU checked for eligibility.)
2455 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2456 * to preempted lock-holder could result in wrong VCPU selection and CPU
2457 * burning. Giving priority for a potential lock-holder increases lock
2460 * Since algorithm is based on heuristics, accessing another VCPU data without
2461 * locking does not harm. It may result in trying to yield to same VCPU, fail
2462 * and continue with next VCPU and so on.
2464 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
2466 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2469 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
2470 vcpu
->spin_loop
.dy_eligible
;
2472 if (vcpu
->spin_loop
.in_spin_loop
)
2473 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
2481 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
, bool yield_to_kernel_mode
)
2483 struct kvm
*kvm
= me
->kvm
;
2484 struct kvm_vcpu
*vcpu
;
2485 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
2491 kvm_vcpu_set_in_spin_loop(me
, true);
2493 * We boost the priority of a VCPU that is runnable but not
2494 * currently running, because it got preempted by something
2495 * else and called schedule in __vcpu_run. Hopefully that
2496 * VCPU is holding the lock that we need and will release it.
2497 * We approximate round-robin by starting at the last boosted VCPU.
2499 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
2500 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
2501 if (!pass
&& i
<= last_boosted_vcpu
) {
2502 i
= last_boosted_vcpu
;
2504 } else if (pass
&& i
> last_boosted_vcpu
)
2506 if (!READ_ONCE(vcpu
->preempted
))
2510 if (swait_active(&vcpu
->wq
) && !kvm_arch_vcpu_runnable(vcpu
))
2512 if (yield_to_kernel_mode
&& !kvm_arch_vcpu_in_kernel(vcpu
))
2514 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
2517 yielded
= kvm_vcpu_yield_to(vcpu
);
2519 kvm
->last_boosted_vcpu
= i
;
2521 } else if (yielded
< 0) {
2528 kvm_vcpu_set_in_spin_loop(me
, false);
2530 /* Ensure vcpu is not eligible during next spinloop */
2531 kvm_vcpu_set_dy_eligible(me
, false);
2533 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
2535 static vm_fault_t
kvm_vcpu_fault(struct vm_fault
*vmf
)
2537 struct kvm_vcpu
*vcpu
= vmf
->vma
->vm_file
->private_data
;
2540 if (vmf
->pgoff
== 0)
2541 page
= virt_to_page(vcpu
->run
);
2543 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
2544 page
= virt_to_page(vcpu
->arch
.pio_data
);
2546 #ifdef CONFIG_KVM_MMIO
2547 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
2548 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
2551 return kvm_arch_vcpu_fault(vcpu
, vmf
);
2557 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
2558 .fault
= kvm_vcpu_fault
,
2561 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2563 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
2567 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
2569 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2571 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2572 kvm_put_kvm(vcpu
->kvm
);
2576 static struct file_operations kvm_vcpu_fops
= {
2577 .release
= kvm_vcpu_release
,
2578 .unlocked_ioctl
= kvm_vcpu_ioctl
,
2579 .mmap
= kvm_vcpu_mmap
,
2580 .llseek
= noop_llseek
,
2581 KVM_COMPAT(kvm_vcpu_compat_ioctl
),
2585 * Allocates an inode for the vcpu.
2587 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
2589 char name
[8 + 1 + ITOA_MAX_LEN
+ 1];
2591 snprintf(name
, sizeof(name
), "kvm-vcpu:%d", vcpu
->vcpu_id
);
2592 return anon_inode_getfd(name
, &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
2595 static int kvm_create_vcpu_debugfs(struct kvm_vcpu
*vcpu
)
2597 char dir_name
[ITOA_MAX_LEN
* 2];
2600 if (!kvm_arch_has_vcpu_debugfs())
2603 if (!debugfs_initialized())
2606 snprintf(dir_name
, sizeof(dir_name
), "vcpu%d", vcpu
->vcpu_id
);
2607 vcpu
->debugfs_dentry
= debugfs_create_dir(dir_name
,
2608 vcpu
->kvm
->debugfs_dentry
);
2609 if (!vcpu
->debugfs_dentry
)
2612 ret
= kvm_arch_create_vcpu_debugfs(vcpu
);
2614 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2622 * Creates some virtual cpus. Good luck creating more than one.
2624 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
2627 struct kvm_vcpu
*vcpu
;
2629 if (id
>= KVM_MAX_VCPU_ID
)
2632 mutex_lock(&kvm
->lock
);
2633 if (kvm
->created_vcpus
== KVM_MAX_VCPUS
) {
2634 mutex_unlock(&kvm
->lock
);
2638 kvm
->created_vcpus
++;
2639 mutex_unlock(&kvm
->lock
);
2641 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
2644 goto vcpu_decrement
;
2647 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
2649 r
= kvm_arch_vcpu_setup(vcpu
);
2653 r
= kvm_create_vcpu_debugfs(vcpu
);
2657 mutex_lock(&kvm
->lock
);
2658 if (kvm_get_vcpu_by_id(kvm
, id
)) {
2660 goto unlock_vcpu_destroy
;
2663 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
2665 /* Now it's all set up, let userspace reach it */
2667 r
= create_vcpu_fd(vcpu
);
2670 goto unlock_vcpu_destroy
;
2673 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
2676 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2677 * before kvm->online_vcpu's incremented value.
2680 atomic_inc(&kvm
->online_vcpus
);
2682 mutex_unlock(&kvm
->lock
);
2683 kvm_arch_vcpu_postcreate(vcpu
);
2686 unlock_vcpu_destroy
:
2687 mutex_unlock(&kvm
->lock
);
2688 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2690 kvm_arch_vcpu_destroy(vcpu
);
2692 mutex_lock(&kvm
->lock
);
2693 kvm
->created_vcpus
--;
2694 mutex_unlock(&kvm
->lock
);
2698 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
2701 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
2702 vcpu
->sigset_active
= 1;
2703 vcpu
->sigset
= *sigset
;
2705 vcpu
->sigset_active
= 0;
2709 static long kvm_vcpu_ioctl(struct file
*filp
,
2710 unsigned int ioctl
, unsigned long arg
)
2712 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2713 void __user
*argp
= (void __user
*)arg
;
2715 struct kvm_fpu
*fpu
= NULL
;
2716 struct kvm_sregs
*kvm_sregs
= NULL
;
2718 if (vcpu
->kvm
->mm
!= current
->mm
)
2721 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
2725 * Some architectures have vcpu ioctls that are asynchronous to vcpu
2726 * execution; mutex_lock() would break them.
2728 r
= kvm_arch_vcpu_async_ioctl(filp
, ioctl
, arg
);
2729 if (r
!= -ENOIOCTLCMD
)
2732 if (mutex_lock_killable(&vcpu
->mutex
))
2740 oldpid
= rcu_access_pointer(vcpu
->pid
);
2741 if (unlikely(oldpid
!= task_pid(current
))) {
2742 /* The thread running this VCPU changed. */
2745 r
= kvm_arch_vcpu_run_pid_change(vcpu
);
2749 newpid
= get_task_pid(current
, PIDTYPE_PID
);
2750 rcu_assign_pointer(vcpu
->pid
, newpid
);
2755 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
2756 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
2759 case KVM_GET_REGS
: {
2760 struct kvm_regs
*kvm_regs
;
2763 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL_ACCOUNT
);
2766 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2770 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2777 case KVM_SET_REGS
: {
2778 struct kvm_regs
*kvm_regs
;
2781 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2782 if (IS_ERR(kvm_regs
)) {
2783 r
= PTR_ERR(kvm_regs
);
2786 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2790 case KVM_GET_SREGS
: {
2791 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
),
2792 GFP_KERNEL_ACCOUNT
);
2796 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2800 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2805 case KVM_SET_SREGS
: {
2806 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2807 if (IS_ERR(kvm_sregs
)) {
2808 r
= PTR_ERR(kvm_sregs
);
2812 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2815 case KVM_GET_MP_STATE
: {
2816 struct kvm_mp_state mp_state
;
2818 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2822 if (copy_to_user(argp
, &mp_state
, sizeof(mp_state
)))
2827 case KVM_SET_MP_STATE
: {
2828 struct kvm_mp_state mp_state
;
2831 if (copy_from_user(&mp_state
, argp
, sizeof(mp_state
)))
2833 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2836 case KVM_TRANSLATE
: {
2837 struct kvm_translation tr
;
2840 if (copy_from_user(&tr
, argp
, sizeof(tr
)))
2842 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2846 if (copy_to_user(argp
, &tr
, sizeof(tr
)))
2851 case KVM_SET_GUEST_DEBUG
: {
2852 struct kvm_guest_debug dbg
;
2855 if (copy_from_user(&dbg
, argp
, sizeof(dbg
)))
2857 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2860 case KVM_SET_SIGNAL_MASK
: {
2861 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2862 struct kvm_signal_mask kvm_sigmask
;
2863 sigset_t sigset
, *p
;
2868 if (copy_from_user(&kvm_sigmask
, argp
,
2869 sizeof(kvm_sigmask
)))
2872 if (kvm_sigmask
.len
!= sizeof(sigset
))
2875 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2880 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2884 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL_ACCOUNT
);
2888 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2892 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2898 fpu
= memdup_user(argp
, sizeof(*fpu
));
2904 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2908 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2911 mutex_unlock(&vcpu
->mutex
);
2917 #ifdef CONFIG_KVM_COMPAT
2918 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2919 unsigned int ioctl
, unsigned long arg
)
2921 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2922 void __user
*argp
= compat_ptr(arg
);
2925 if (vcpu
->kvm
->mm
!= current
->mm
)
2929 case KVM_SET_SIGNAL_MASK
: {
2930 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2931 struct kvm_signal_mask kvm_sigmask
;
2936 if (copy_from_user(&kvm_sigmask
, argp
,
2937 sizeof(kvm_sigmask
)))
2940 if (kvm_sigmask
.len
!= sizeof(compat_sigset_t
))
2943 if (get_compat_sigset(&sigset
, (void *)sigmask_arg
->sigset
))
2945 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2947 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2951 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2959 static int kvm_device_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
2961 struct kvm_device
*dev
= filp
->private_data
;
2964 return dev
->ops
->mmap(dev
, vma
);
2969 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2970 int (*accessor
)(struct kvm_device
*dev
,
2971 struct kvm_device_attr
*attr
),
2974 struct kvm_device_attr attr
;
2979 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2982 return accessor(dev
, &attr
);
2985 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2988 struct kvm_device
*dev
= filp
->private_data
;
2990 if (dev
->kvm
->mm
!= current
->mm
)
2994 case KVM_SET_DEVICE_ATTR
:
2995 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2996 case KVM_GET_DEVICE_ATTR
:
2997 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2998 case KVM_HAS_DEVICE_ATTR
:
2999 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
3001 if (dev
->ops
->ioctl
)
3002 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
3008 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
3010 struct kvm_device
*dev
= filp
->private_data
;
3011 struct kvm
*kvm
= dev
->kvm
;
3013 if (dev
->ops
->release
) {
3014 mutex_lock(&kvm
->lock
);
3015 list_del(&dev
->vm_node
);
3016 dev
->ops
->release(dev
);
3017 mutex_unlock(&kvm
->lock
);
3024 static const struct file_operations kvm_device_fops
= {
3025 .unlocked_ioctl
= kvm_device_ioctl
,
3026 .release
= kvm_device_release
,
3027 KVM_COMPAT(kvm_device_ioctl
),
3028 .mmap
= kvm_device_mmap
,
3031 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
3033 if (filp
->f_op
!= &kvm_device_fops
)
3036 return filp
->private_data
;
3039 static struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
3040 #ifdef CONFIG_KVM_MPIC
3041 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
3042 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
3046 int kvm_register_device_ops(struct kvm_device_ops
*ops
, u32 type
)
3048 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
3051 if (kvm_device_ops_table
[type
] != NULL
)
3054 kvm_device_ops_table
[type
] = ops
;
3058 void kvm_unregister_device_ops(u32 type
)
3060 if (kvm_device_ops_table
[type
] != NULL
)
3061 kvm_device_ops_table
[type
] = NULL
;
3064 static int kvm_ioctl_create_device(struct kvm
*kvm
,
3065 struct kvm_create_device
*cd
)
3067 struct kvm_device_ops
*ops
= NULL
;
3068 struct kvm_device
*dev
;
3069 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
3073 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
3076 type
= array_index_nospec(cd
->type
, ARRAY_SIZE(kvm_device_ops_table
));
3077 ops
= kvm_device_ops_table
[type
];
3084 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL_ACCOUNT
);
3091 mutex_lock(&kvm
->lock
);
3092 ret
= ops
->create(dev
, type
);
3094 mutex_unlock(&kvm
->lock
);
3098 list_add(&dev
->vm_node
, &kvm
->devices
);
3099 mutex_unlock(&kvm
->lock
);
3105 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
3108 mutex_lock(&kvm
->lock
);
3109 list_del(&dev
->vm_node
);
3110 mutex_unlock(&kvm
->lock
);
3119 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
3122 case KVM_CAP_USER_MEMORY
:
3123 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
3124 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
3125 case KVM_CAP_INTERNAL_ERROR_DATA
:
3126 #ifdef CONFIG_HAVE_KVM_MSI
3127 case KVM_CAP_SIGNAL_MSI
:
3129 #ifdef CONFIG_HAVE_KVM_IRQFD
3131 case KVM_CAP_IRQFD_RESAMPLE
:
3133 case KVM_CAP_IOEVENTFD_ANY_LENGTH
:
3134 case KVM_CAP_CHECK_EXTENSION_VM
:
3135 case KVM_CAP_ENABLE_CAP_VM
:
3136 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3137 case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2
:
3140 #ifdef CONFIG_KVM_MMIO
3141 case KVM_CAP_COALESCED_MMIO
:
3142 return KVM_COALESCED_MMIO_PAGE_OFFSET
;
3143 case KVM_CAP_COALESCED_PIO
:
3146 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3147 case KVM_CAP_IRQ_ROUTING
:
3148 return KVM_MAX_IRQ_ROUTES
;
3150 #if KVM_ADDRESS_SPACE_NUM > 1
3151 case KVM_CAP_MULTI_ADDRESS_SPACE
:
3152 return KVM_ADDRESS_SPACE_NUM
;
3154 case KVM_CAP_NR_MEMSLOTS
:
3155 return KVM_USER_MEM_SLOTS
;
3159 return kvm_vm_ioctl_check_extension(kvm
, arg
);
3162 int __attribute__((weak
)) kvm_vm_ioctl_enable_cap(struct kvm
*kvm
,
3163 struct kvm_enable_cap
*cap
)
3168 static int kvm_vm_ioctl_enable_cap_generic(struct kvm
*kvm
,
3169 struct kvm_enable_cap
*cap
)
3172 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3173 case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2
:
3174 if (cap
->flags
|| (cap
->args
[0] & ~1))
3176 kvm
->manual_dirty_log_protect
= cap
->args
[0];
3180 return kvm_vm_ioctl_enable_cap(kvm
, cap
);
3184 static long kvm_vm_ioctl(struct file
*filp
,
3185 unsigned int ioctl
, unsigned long arg
)
3187 struct kvm
*kvm
= filp
->private_data
;
3188 void __user
*argp
= (void __user
*)arg
;
3191 if (kvm
->mm
!= current
->mm
)
3194 case KVM_CREATE_VCPU
:
3195 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
3197 case KVM_ENABLE_CAP
: {
3198 struct kvm_enable_cap cap
;
3201 if (copy_from_user(&cap
, argp
, sizeof(cap
)))
3203 r
= kvm_vm_ioctl_enable_cap_generic(kvm
, &cap
);
3206 case KVM_SET_USER_MEMORY_REGION
: {
3207 struct kvm_userspace_memory_region kvm_userspace_mem
;
3210 if (copy_from_user(&kvm_userspace_mem
, argp
,
3211 sizeof(kvm_userspace_mem
)))
3214 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
3217 case KVM_GET_DIRTY_LOG
: {
3218 struct kvm_dirty_log log
;
3221 if (copy_from_user(&log
, argp
, sizeof(log
)))
3223 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
3226 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3227 case KVM_CLEAR_DIRTY_LOG
: {
3228 struct kvm_clear_dirty_log log
;
3231 if (copy_from_user(&log
, argp
, sizeof(log
)))
3233 r
= kvm_vm_ioctl_clear_dirty_log(kvm
, &log
);
3237 #ifdef CONFIG_KVM_MMIO
3238 case KVM_REGISTER_COALESCED_MMIO
: {
3239 struct kvm_coalesced_mmio_zone zone
;
3242 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
3244 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
3247 case KVM_UNREGISTER_COALESCED_MMIO
: {
3248 struct kvm_coalesced_mmio_zone zone
;
3251 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
3253 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
3258 struct kvm_irqfd data
;
3261 if (copy_from_user(&data
, argp
, sizeof(data
)))
3263 r
= kvm_irqfd(kvm
, &data
);
3266 case KVM_IOEVENTFD
: {
3267 struct kvm_ioeventfd data
;
3270 if (copy_from_user(&data
, argp
, sizeof(data
)))
3272 r
= kvm_ioeventfd(kvm
, &data
);
3275 #ifdef CONFIG_HAVE_KVM_MSI
3276 case KVM_SIGNAL_MSI
: {
3280 if (copy_from_user(&msi
, argp
, sizeof(msi
)))
3282 r
= kvm_send_userspace_msi(kvm
, &msi
);
3286 #ifdef __KVM_HAVE_IRQ_LINE
3287 case KVM_IRQ_LINE_STATUS
:
3288 case KVM_IRQ_LINE
: {
3289 struct kvm_irq_level irq_event
;
3292 if (copy_from_user(&irq_event
, argp
, sizeof(irq_event
)))
3295 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
3296 ioctl
== KVM_IRQ_LINE_STATUS
);
3301 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
3302 if (copy_to_user(argp
, &irq_event
, sizeof(irq_event
)))
3310 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3311 case KVM_SET_GSI_ROUTING
: {
3312 struct kvm_irq_routing routing
;
3313 struct kvm_irq_routing __user
*urouting
;
3314 struct kvm_irq_routing_entry
*entries
= NULL
;
3317 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
3320 if (!kvm_arch_can_set_irq_routing(kvm
))
3322 if (routing
.nr
> KVM_MAX_IRQ_ROUTES
)
3328 entries
= vmalloc(array_size(sizeof(*entries
),
3334 if (copy_from_user(entries
, urouting
->entries
,
3335 routing
.nr
* sizeof(*entries
)))
3336 goto out_free_irq_routing
;
3338 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
3340 out_free_irq_routing
:
3344 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
3345 case KVM_CREATE_DEVICE
: {
3346 struct kvm_create_device cd
;
3349 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
3352 r
= kvm_ioctl_create_device(kvm
, &cd
);
3357 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
3363 case KVM_CHECK_EXTENSION
:
3364 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
3367 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
3373 #ifdef CONFIG_KVM_COMPAT
3374 struct compat_kvm_dirty_log
{
3378 compat_uptr_t dirty_bitmap
; /* one bit per page */
3383 static long kvm_vm_compat_ioctl(struct file
*filp
,
3384 unsigned int ioctl
, unsigned long arg
)
3386 struct kvm
*kvm
= filp
->private_data
;
3389 if (kvm
->mm
!= current
->mm
)
3392 case KVM_GET_DIRTY_LOG
: {
3393 struct compat_kvm_dirty_log compat_log
;
3394 struct kvm_dirty_log log
;
3396 if (copy_from_user(&compat_log
, (void __user
*)arg
,
3397 sizeof(compat_log
)))
3399 log
.slot
= compat_log
.slot
;
3400 log
.padding1
= compat_log
.padding1
;
3401 log
.padding2
= compat_log
.padding2
;
3402 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
3404 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
3408 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
3414 static struct file_operations kvm_vm_fops
= {
3415 .release
= kvm_vm_release
,
3416 .unlocked_ioctl
= kvm_vm_ioctl
,
3417 .llseek
= noop_llseek
,
3418 KVM_COMPAT(kvm_vm_compat_ioctl
),
3421 static int kvm_dev_ioctl_create_vm(unsigned long type
)
3427 kvm
= kvm_create_vm(type
);
3429 return PTR_ERR(kvm
);
3430 #ifdef CONFIG_KVM_MMIO
3431 r
= kvm_coalesced_mmio_init(kvm
);
3435 r
= get_unused_fd_flags(O_CLOEXEC
);
3439 file
= anon_inode_getfile("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
3447 * Don't call kvm_put_kvm anymore at this point; file->f_op is
3448 * already set, with ->release() being kvm_vm_release(). In error
3449 * cases it will be called by the final fput(file) and will take
3450 * care of doing kvm_put_kvm(kvm).
3452 if (kvm_create_vm_debugfs(kvm
, r
) < 0) {
3457 kvm_uevent_notify_change(KVM_EVENT_CREATE_VM
, kvm
);
3459 fd_install(r
, file
);
3467 static long kvm_dev_ioctl(struct file
*filp
,
3468 unsigned int ioctl
, unsigned long arg
)
3473 case KVM_GET_API_VERSION
:
3476 r
= KVM_API_VERSION
;
3479 r
= kvm_dev_ioctl_create_vm(arg
);
3481 case KVM_CHECK_EXTENSION
:
3482 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
3484 case KVM_GET_VCPU_MMAP_SIZE
:
3487 r
= PAGE_SIZE
; /* struct kvm_run */
3489 r
+= PAGE_SIZE
; /* pio data page */
3491 #ifdef CONFIG_KVM_MMIO
3492 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
3495 case KVM_TRACE_ENABLE
:
3496 case KVM_TRACE_PAUSE
:
3497 case KVM_TRACE_DISABLE
:
3501 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
3507 static struct file_operations kvm_chardev_ops
= {
3508 .unlocked_ioctl
= kvm_dev_ioctl
,
3509 .llseek
= noop_llseek
,
3510 KVM_COMPAT(kvm_dev_ioctl
),
3513 static struct miscdevice kvm_dev
= {
3519 static void hardware_enable_nolock(void *junk
)
3521 int cpu
= raw_smp_processor_id();
3524 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3527 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
3529 r
= kvm_arch_hardware_enable();
3532 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3533 atomic_inc(&hardware_enable_failed
);
3534 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu
);
3538 static int kvm_starting_cpu(unsigned int cpu
)
3540 raw_spin_lock(&kvm_count_lock
);
3541 if (kvm_usage_count
)
3542 hardware_enable_nolock(NULL
);
3543 raw_spin_unlock(&kvm_count_lock
);
3547 static void hardware_disable_nolock(void *junk
)
3549 int cpu
= raw_smp_processor_id();
3551 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3553 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3554 kvm_arch_hardware_disable();
3557 static int kvm_dying_cpu(unsigned int cpu
)
3559 raw_spin_lock(&kvm_count_lock
);
3560 if (kvm_usage_count
)
3561 hardware_disable_nolock(NULL
);
3562 raw_spin_unlock(&kvm_count_lock
);
3566 static void hardware_disable_all_nolock(void)
3568 BUG_ON(!kvm_usage_count
);
3571 if (!kvm_usage_count
)
3572 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3575 static void hardware_disable_all(void)
3577 raw_spin_lock(&kvm_count_lock
);
3578 hardware_disable_all_nolock();
3579 raw_spin_unlock(&kvm_count_lock
);
3582 static int hardware_enable_all(void)
3586 raw_spin_lock(&kvm_count_lock
);
3589 if (kvm_usage_count
== 1) {
3590 atomic_set(&hardware_enable_failed
, 0);
3591 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
3593 if (atomic_read(&hardware_enable_failed
)) {
3594 hardware_disable_all_nolock();
3599 raw_spin_unlock(&kvm_count_lock
);
3604 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
3608 * Some (well, at least mine) BIOSes hang on reboot if
3611 * And Intel TXT required VMX off for all cpu when system shutdown.
3613 pr_info("kvm: exiting hardware virtualization\n");
3614 kvm_rebooting
= true;
3615 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3619 static struct notifier_block kvm_reboot_notifier
= {
3620 .notifier_call
= kvm_reboot
,
3624 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
3628 for (i
= 0; i
< bus
->dev_count
; i
++) {
3629 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
3631 kvm_iodevice_destructor(pos
);
3636 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
3637 const struct kvm_io_range
*r2
)
3639 gpa_t addr1
= r1
->addr
;
3640 gpa_t addr2
= r2
->addr
;
3645 /* If r2->len == 0, match the exact address. If r2->len != 0,
3646 * accept any overlapping write. Any order is acceptable for
3647 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3648 * we process all of them.
3661 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
3663 return kvm_io_bus_cmp(p1
, p2
);
3666 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
3667 gpa_t addr
, int len
)
3669 struct kvm_io_range
*range
, key
;
3672 key
= (struct kvm_io_range
) {
3677 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
3678 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
3682 off
= range
- bus
->range
;
3684 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
3690 static int __kvm_io_bus_write(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3691 struct kvm_io_range
*range
, const void *val
)
3695 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3699 while (idx
< bus
->dev_count
&&
3700 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3701 if (!kvm_iodevice_write(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3710 /* kvm_io_bus_write - called under kvm->slots_lock */
3711 int kvm_io_bus_write(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3712 int len
, const void *val
)
3714 struct kvm_io_bus
*bus
;
3715 struct kvm_io_range range
;
3718 range
= (struct kvm_io_range
) {
3723 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3726 r
= __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3727 return r
< 0 ? r
: 0;
3729 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
3731 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3732 int kvm_io_bus_write_cookie(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
,
3733 gpa_t addr
, int len
, const void *val
, long cookie
)
3735 struct kvm_io_bus
*bus
;
3736 struct kvm_io_range range
;
3738 range
= (struct kvm_io_range
) {
3743 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3747 /* First try the device referenced by cookie. */
3748 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
3749 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
3750 if (!kvm_iodevice_write(vcpu
, bus
->range
[cookie
].dev
, addr
, len
,
3755 * cookie contained garbage; fall back to search and return the
3756 * correct cookie value.
3758 return __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3761 static int __kvm_io_bus_read(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3762 struct kvm_io_range
*range
, void *val
)
3766 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3770 while (idx
< bus
->dev_count
&&
3771 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3772 if (!kvm_iodevice_read(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3781 /* kvm_io_bus_read - called under kvm->slots_lock */
3782 int kvm_io_bus_read(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3785 struct kvm_io_bus
*bus
;
3786 struct kvm_io_range range
;
3789 range
= (struct kvm_io_range
) {
3794 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3797 r
= __kvm_io_bus_read(vcpu
, bus
, &range
, val
);
3798 return r
< 0 ? r
: 0;
3801 /* Caller must hold slots_lock. */
3802 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
3803 int len
, struct kvm_io_device
*dev
)
3806 struct kvm_io_bus
*new_bus
, *bus
;
3807 struct kvm_io_range range
;
3809 bus
= kvm_get_bus(kvm
, bus_idx
);
3813 /* exclude ioeventfd which is limited by maximum fd */
3814 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
3817 new_bus
= kmalloc(struct_size(bus
, range
, bus
->dev_count
+ 1),
3818 GFP_KERNEL_ACCOUNT
);
3822 range
= (struct kvm_io_range
) {
3828 for (i
= 0; i
< bus
->dev_count
; i
++)
3829 if (kvm_io_bus_cmp(&bus
->range
[i
], &range
) > 0)
3832 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3833 new_bus
->dev_count
++;
3834 new_bus
->range
[i
] = range
;
3835 memcpy(new_bus
->range
+ i
+ 1, bus
->range
+ i
,
3836 (bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3837 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3838 synchronize_srcu_expedited(&kvm
->srcu
);
3844 /* Caller must hold slots_lock. */
3845 void kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3846 struct kvm_io_device
*dev
)
3849 struct kvm_io_bus
*new_bus
, *bus
;
3851 bus
= kvm_get_bus(kvm
, bus_idx
);
3855 for (i
= 0; i
< bus
->dev_count
; i
++)
3856 if (bus
->range
[i
].dev
== dev
) {
3860 if (i
== bus
->dev_count
)
3863 new_bus
= kmalloc(struct_size(bus
, range
, bus
->dev_count
- 1),
3864 GFP_KERNEL_ACCOUNT
);
3866 pr_err("kvm: failed to shrink bus, removing it completely\n");
3870 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3871 new_bus
->dev_count
--;
3872 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3873 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3876 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3877 synchronize_srcu_expedited(&kvm
->srcu
);
3882 struct kvm_io_device
*kvm_io_bus_get_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3885 struct kvm_io_bus
*bus
;
3886 int dev_idx
, srcu_idx
;
3887 struct kvm_io_device
*iodev
= NULL
;
3889 srcu_idx
= srcu_read_lock(&kvm
->srcu
);
3891 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
3895 dev_idx
= kvm_io_bus_get_first_dev(bus
, addr
, 1);
3899 iodev
= bus
->range
[dev_idx
].dev
;
3902 srcu_read_unlock(&kvm
->srcu
, srcu_idx
);
3906 EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev
);
3908 static int kvm_debugfs_open(struct inode
*inode
, struct file
*file
,
3909 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
3912 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)
3915 /* The debugfs files are a reference to the kvm struct which
3916 * is still valid when kvm_destroy_vm is called.
3917 * To avoid the race between open and the removal of the debugfs
3918 * directory we test against the users count.
3920 if (!refcount_inc_not_zero(&stat_data
->kvm
->users_count
))
3923 if (simple_attr_open(inode
, file
, get
, set
, fmt
)) {
3924 kvm_put_kvm(stat_data
->kvm
);
3931 static int kvm_debugfs_release(struct inode
*inode
, struct file
*file
)
3933 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)
3936 simple_attr_release(inode
, file
);
3937 kvm_put_kvm(stat_data
->kvm
);
3942 static int vm_stat_get_per_vm(void *data
, u64
*val
)
3944 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3946 *val
= *(ulong
*)((void *)stat_data
->kvm
+ stat_data
->offset
);
3951 static int vm_stat_clear_per_vm(void *data
, u64 val
)
3953 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3958 *(ulong
*)((void *)stat_data
->kvm
+ stat_data
->offset
) = 0;
3963 static int vm_stat_get_per_vm_open(struct inode
*inode
, struct file
*file
)
3965 __simple_attr_check_format("%llu\n", 0ull);
3966 return kvm_debugfs_open(inode
, file
, vm_stat_get_per_vm
,
3967 vm_stat_clear_per_vm
, "%llu\n");
3970 static const struct file_operations vm_stat_get_per_vm_fops
= {
3971 .owner
= THIS_MODULE
,
3972 .open
= vm_stat_get_per_vm_open
,
3973 .release
= kvm_debugfs_release
,
3974 .read
= simple_attr_read
,
3975 .write
= simple_attr_write
,
3976 .llseek
= no_llseek
,
3979 static int vcpu_stat_get_per_vm(void *data
, u64
*val
)
3982 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3983 struct kvm_vcpu
*vcpu
;
3987 kvm_for_each_vcpu(i
, vcpu
, stat_data
->kvm
)
3988 *val
+= *(u64
*)((void *)vcpu
+ stat_data
->offset
);
3993 static int vcpu_stat_clear_per_vm(void *data
, u64 val
)
3996 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3997 struct kvm_vcpu
*vcpu
;
4002 kvm_for_each_vcpu(i
, vcpu
, stat_data
->kvm
)
4003 *(u64
*)((void *)vcpu
+ stat_data
->offset
) = 0;
4008 static int vcpu_stat_get_per_vm_open(struct inode
*inode
, struct file
*file
)
4010 __simple_attr_check_format("%llu\n", 0ull);
4011 return kvm_debugfs_open(inode
, file
, vcpu_stat_get_per_vm
,
4012 vcpu_stat_clear_per_vm
, "%llu\n");
4015 static const struct file_operations vcpu_stat_get_per_vm_fops
= {
4016 .owner
= THIS_MODULE
,
4017 .open
= vcpu_stat_get_per_vm_open
,
4018 .release
= kvm_debugfs_release
,
4019 .read
= simple_attr_read
,
4020 .write
= simple_attr_write
,
4021 .llseek
= no_llseek
,
4024 static const struct file_operations
*stat_fops_per_vm
[] = {
4025 [KVM_STAT_VCPU
] = &vcpu_stat_get_per_vm_fops
,
4026 [KVM_STAT_VM
] = &vm_stat_get_per_vm_fops
,
4029 static int vm_stat_get(void *_offset
, u64
*val
)
4031 unsigned offset
= (long)_offset
;
4033 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
4037 spin_lock(&kvm_lock
);
4038 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4040 vm_stat_get_per_vm((void *)&stat_tmp
, &tmp_val
);
4043 spin_unlock(&kvm_lock
);
4047 static int vm_stat_clear(void *_offset
, u64 val
)
4049 unsigned offset
= (long)_offset
;
4051 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
4056 spin_lock(&kvm_lock
);
4057 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4059 vm_stat_clear_per_vm((void *)&stat_tmp
, 0);
4061 spin_unlock(&kvm_lock
);
4066 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, vm_stat_clear
, "%llu\n");
4068 static int vcpu_stat_get(void *_offset
, u64
*val
)
4070 unsigned offset
= (long)_offset
;
4072 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
4076 spin_lock(&kvm_lock
);
4077 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4079 vcpu_stat_get_per_vm((void *)&stat_tmp
, &tmp_val
);
4082 spin_unlock(&kvm_lock
);
4086 static int vcpu_stat_clear(void *_offset
, u64 val
)
4088 unsigned offset
= (long)_offset
;
4090 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
4095 spin_lock(&kvm_lock
);
4096 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4098 vcpu_stat_clear_per_vm((void *)&stat_tmp
, 0);
4100 spin_unlock(&kvm_lock
);
4105 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, vcpu_stat_clear
,
4108 static const struct file_operations
*stat_fops
[] = {
4109 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
4110 [KVM_STAT_VM
] = &vm_stat_fops
,
4113 static void kvm_uevent_notify_change(unsigned int type
, struct kvm
*kvm
)
4115 struct kobj_uevent_env
*env
;
4116 unsigned long long created
, active
;
4118 if (!kvm_dev
.this_device
|| !kvm
)
4121 spin_lock(&kvm_lock
);
4122 if (type
== KVM_EVENT_CREATE_VM
) {
4123 kvm_createvm_count
++;
4125 } else if (type
== KVM_EVENT_DESTROY_VM
) {
4128 created
= kvm_createvm_count
;
4129 active
= kvm_active_vms
;
4130 spin_unlock(&kvm_lock
);
4132 env
= kzalloc(sizeof(*env
), GFP_KERNEL_ACCOUNT
);
4136 add_uevent_var(env
, "CREATED=%llu", created
);
4137 add_uevent_var(env
, "COUNT=%llu", active
);
4139 if (type
== KVM_EVENT_CREATE_VM
) {
4140 add_uevent_var(env
, "EVENT=create");
4141 kvm
->userspace_pid
= task_pid_nr(current
);
4142 } else if (type
== KVM_EVENT_DESTROY_VM
) {
4143 add_uevent_var(env
, "EVENT=destroy");
4145 add_uevent_var(env
, "PID=%d", kvm
->userspace_pid
);
4147 if (!IS_ERR_OR_NULL(kvm
->debugfs_dentry
)) {
4148 char *tmp
, *p
= kmalloc(PATH_MAX
, GFP_KERNEL_ACCOUNT
);
4151 tmp
= dentry_path_raw(kvm
->debugfs_dentry
, p
, PATH_MAX
);
4153 add_uevent_var(env
, "STATS_PATH=%s", tmp
);
4157 /* no need for checks, since we are adding at most only 5 keys */
4158 env
->envp
[env
->envp_idx
++] = NULL
;
4159 kobject_uevent_env(&kvm_dev
.this_device
->kobj
, KOBJ_CHANGE
, env
->envp
);
4163 static void kvm_init_debug(void)
4165 struct kvm_stats_debugfs_item
*p
;
4167 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
4169 kvm_debugfs_num_entries
= 0;
4170 for (p
= debugfs_entries
; p
->name
; ++p
, kvm_debugfs_num_entries
++) {
4171 debugfs_create_file(p
->name
, 0644, kvm_debugfs_dir
,
4172 (void *)(long)p
->offset
,
4173 stat_fops
[p
->kind
]);
4177 static int kvm_suspend(void)
4179 if (kvm_usage_count
)
4180 hardware_disable_nolock(NULL
);
4184 static void kvm_resume(void)
4186 if (kvm_usage_count
) {
4187 #ifdef CONFIG_LOCKDEP
4188 WARN_ON(lockdep_is_held(&kvm_count_lock
));
4190 hardware_enable_nolock(NULL
);
4194 static struct syscore_ops kvm_syscore_ops
= {
4195 .suspend
= kvm_suspend
,
4196 .resume
= kvm_resume
,
4200 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
4202 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
4205 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
4207 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
4209 if (vcpu
->preempted
)
4210 vcpu
->preempted
= false;
4212 kvm_arch_sched_in(vcpu
, cpu
);
4214 kvm_arch_vcpu_load(vcpu
, cpu
);
4217 static void kvm_sched_out(struct preempt_notifier
*pn
,
4218 struct task_struct
*next
)
4220 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
4222 if (current
->state
== TASK_RUNNING
)
4223 vcpu
->preempted
= true;
4224 kvm_arch_vcpu_put(vcpu
);
4227 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
4228 struct module
*module
)
4233 r
= kvm_arch_init(opaque
);
4238 * kvm_arch_init makes sure there's at most one caller
4239 * for architectures that support multiple implementations,
4240 * like intel and amd on x86.
4241 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
4242 * conflicts in case kvm is already setup for another implementation.
4244 r
= kvm_irqfd_init();
4248 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
4253 r
= kvm_arch_hardware_setup();
4257 for_each_online_cpu(cpu
) {
4258 smp_call_function_single(cpu
,
4259 kvm_arch_check_processor_compat
,
4265 r
= cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING
, "kvm/cpu:starting",
4266 kvm_starting_cpu
, kvm_dying_cpu
);
4269 register_reboot_notifier(&kvm_reboot_notifier
);
4271 /* A kmem cache lets us meet the alignment requirements of fx_save. */
4273 vcpu_align
= __alignof__(struct kvm_vcpu
);
4275 kmem_cache_create_usercopy("kvm_vcpu", vcpu_size
, vcpu_align
,
4277 offsetof(struct kvm_vcpu
, arch
),
4278 sizeof_field(struct kvm_vcpu
, arch
),
4280 if (!kvm_vcpu_cache
) {
4285 r
= kvm_async_pf_init();
4289 kvm_chardev_ops
.owner
= module
;
4290 kvm_vm_fops
.owner
= module
;
4291 kvm_vcpu_fops
.owner
= module
;
4293 r
= misc_register(&kvm_dev
);
4295 pr_err("kvm: misc device register failed\n");
4299 register_syscore_ops(&kvm_syscore_ops
);
4301 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
4302 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
4306 r
= kvm_vfio_ops_init();
4312 kvm_async_pf_deinit();
4314 kmem_cache_destroy(kvm_vcpu_cache
);
4316 unregister_reboot_notifier(&kvm_reboot_notifier
);
4317 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING
);
4320 kvm_arch_hardware_unsetup();
4322 free_cpumask_var(cpus_hardware_enabled
);
4330 EXPORT_SYMBOL_GPL(kvm_init
);
4334 debugfs_remove_recursive(kvm_debugfs_dir
);
4335 misc_deregister(&kvm_dev
);
4336 kmem_cache_destroy(kvm_vcpu_cache
);
4337 kvm_async_pf_deinit();
4338 unregister_syscore_ops(&kvm_syscore_ops
);
4339 unregister_reboot_notifier(&kvm_reboot_notifier
);
4340 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING
);
4341 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
4342 kvm_arch_hardware_unsetup();
4345 free_cpumask_var(cpus_hardware_enabled
);
4346 kvm_vfio_ops_exit();
4348 EXPORT_SYMBOL_GPL(kvm_exit
);