1 // SPDX-License-Identifier: GPL-2.0-only
3 * Kernel-based Virtual Machine driver for Linux
5 * This module enables machines with Intel VT-x extensions to run virtual
6 * machines without emulation or binary translation.
8 * Copyright (C) 2006 Qumranet, Inc.
9 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
12 * Avi Kivity <avi@qumranet.com>
13 * Yaniv Kamay <yaniv@qumranet.com>
16 #include <kvm/iodev.h>
18 #include <linux/kvm_host.h>
19 #include <linux/kvm.h>
20 #include <linux/module.h>
21 #include <linux/errno.h>
22 #include <linux/percpu.h>
24 #include <linux/miscdevice.h>
25 #include <linux/vmalloc.h>
26 #include <linux/reboot.h>
27 #include <linux/debugfs.h>
28 #include <linux/highmem.h>
29 #include <linux/file.h>
30 #include <linux/syscore_ops.h>
31 #include <linux/cpu.h>
32 #include <linux/sched/signal.h>
33 #include <linux/sched/mm.h>
34 #include <linux/sched/stat.h>
35 #include <linux/cpumask.h>
36 #include <linux/smp.h>
37 #include <linux/anon_inodes.h>
38 #include <linux/profile.h>
39 #include <linux/kvm_para.h>
40 #include <linux/pagemap.h>
41 #include <linux/mman.h>
42 #include <linux/swap.h>
43 #include <linux/bitops.h>
44 #include <linux/spinlock.h>
45 #include <linux/compat.h>
46 #include <linux/srcu.h>
47 #include <linux/hugetlb.h>
48 #include <linux/slab.h>
49 #include <linux/sort.h>
50 #include <linux/bsearch.h>
52 #include <linux/lockdep.h>
53 #include <linux/kthread.h>
55 #include <asm/processor.h>
56 #include <asm/ioctl.h>
57 #include <linux/uaccess.h>
58 #include <asm/pgtable.h>
60 #include "coalesced_mmio.h"
64 #define CREATE_TRACE_POINTS
65 #include <trace/events/kvm.h>
67 /* Worst case buffer size needed for holding an integer. */
68 #define ITOA_MAX_LEN 12
70 MODULE_AUTHOR("Qumranet");
71 MODULE_LICENSE("GPL");
73 /* Architectures should define their poll value according to the halt latency */
74 unsigned int halt_poll_ns
= KVM_HALT_POLL_NS_DEFAULT
;
75 module_param(halt_poll_ns
, uint
, 0644);
76 EXPORT_SYMBOL_GPL(halt_poll_ns
);
78 /* Default doubles per-vcpu halt_poll_ns. */
79 unsigned int halt_poll_ns_grow
= 2;
80 module_param(halt_poll_ns_grow
, uint
, 0644);
81 EXPORT_SYMBOL_GPL(halt_poll_ns_grow
);
83 /* The start value to grow halt_poll_ns from */
84 unsigned int halt_poll_ns_grow_start
= 10000; /* 10us */
85 module_param(halt_poll_ns_grow_start
, uint
, 0644);
86 EXPORT_SYMBOL_GPL(halt_poll_ns_grow_start
);
88 /* Default resets per-vcpu halt_poll_ns . */
89 unsigned int halt_poll_ns_shrink
;
90 module_param(halt_poll_ns_shrink
, uint
, 0644);
91 EXPORT_SYMBOL_GPL(halt_poll_ns_shrink
);
96 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
99 DEFINE_MUTEX(kvm_lock
);
100 static DEFINE_RAW_SPINLOCK(kvm_count_lock
);
103 static cpumask_var_t cpus_hardware_enabled
;
104 static int kvm_usage_count
;
105 static atomic_t hardware_enable_failed
;
107 struct kmem_cache
*kvm_vcpu_cache
;
108 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
110 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
112 struct dentry
*kvm_debugfs_dir
;
113 EXPORT_SYMBOL_GPL(kvm_debugfs_dir
);
115 static int kvm_debugfs_num_entries
;
116 static const struct file_operations
*stat_fops_per_vm
[];
118 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
120 #ifdef CONFIG_KVM_COMPAT
121 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
123 #define KVM_COMPAT(c) .compat_ioctl = (c)
126 * For architectures that don't implement a compat infrastructure,
127 * adopt a double line of defense:
128 * - Prevent a compat task from opening /dev/kvm
129 * - If the open has been done by a 64bit task, and the KVM fd
130 * passed to a compat task, let the ioctls fail.
132 static long kvm_no_compat_ioctl(struct file
*file
, unsigned int ioctl
,
133 unsigned long arg
) { return -EINVAL
; }
135 static int kvm_no_compat_open(struct inode
*inode
, struct file
*file
)
137 return is_compat_task() ? -ENODEV
: 0;
139 #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl, \
140 .open = kvm_no_compat_open
142 static int hardware_enable_all(void);
143 static void hardware_disable_all(void);
145 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
147 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
, gfn_t gfn
);
149 __visible
bool kvm_rebooting
;
150 EXPORT_SYMBOL_GPL(kvm_rebooting
);
152 static bool largepages_enabled
= true;
154 #define KVM_EVENT_CREATE_VM 0
155 #define KVM_EVENT_DESTROY_VM 1
156 static void kvm_uevent_notify_change(unsigned int type
, struct kvm
*kvm
);
157 static unsigned long long kvm_createvm_count
;
158 static unsigned long long kvm_active_vms
;
160 __weak
int kvm_arch_mmu_notifier_invalidate_range(struct kvm
*kvm
,
161 unsigned long start
, unsigned long end
, bool blockable
)
166 bool kvm_is_zone_device_pfn(kvm_pfn_t pfn
)
169 * The metadata used by is_zone_device_page() to determine whether or
170 * not a page is ZONE_DEVICE is guaranteed to be valid if and only if
171 * the device has been pinned, e.g. by get_user_pages(). WARN if the
172 * page_count() is zero to help detect bad usage of this helper.
174 if (!pfn_valid(pfn
) || WARN_ON_ONCE(!page_count(pfn_to_page(pfn
))))
177 return is_zone_device_page(pfn_to_page(pfn
));
180 bool kvm_is_reserved_pfn(kvm_pfn_t pfn
)
183 * ZONE_DEVICE pages currently set PG_reserved, but from a refcounting
184 * perspective they are "normal" pages, albeit with slightly different
188 return PageReserved(pfn_to_page(pfn
)) &&
189 !kvm_is_zone_device_pfn(pfn
);
195 * Switches to specified vcpu, until a matching vcpu_put()
197 void vcpu_load(struct kvm_vcpu
*vcpu
)
200 preempt_notifier_register(&vcpu
->preempt_notifier
);
201 kvm_arch_vcpu_load(vcpu
, cpu
);
204 EXPORT_SYMBOL_GPL(vcpu_load
);
206 void vcpu_put(struct kvm_vcpu
*vcpu
)
209 kvm_arch_vcpu_put(vcpu
);
210 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
213 EXPORT_SYMBOL_GPL(vcpu_put
);
215 /* TODO: merge with kvm_arch_vcpu_should_kick */
216 static bool kvm_request_needs_ipi(struct kvm_vcpu
*vcpu
, unsigned req
)
218 int mode
= kvm_vcpu_exiting_guest_mode(vcpu
);
221 * We need to wait for the VCPU to reenable interrupts and get out of
222 * READING_SHADOW_PAGE_TABLES mode.
224 if (req
& KVM_REQUEST_WAIT
)
225 return mode
!= OUTSIDE_GUEST_MODE
;
228 * Need to kick a running VCPU, but otherwise there is nothing to do.
230 return mode
== IN_GUEST_MODE
;
233 static void ack_flush(void *_completed
)
237 static inline bool kvm_kick_many_cpus(const struct cpumask
*cpus
, bool wait
)
240 cpus
= cpu_online_mask
;
242 if (cpumask_empty(cpus
))
245 smp_call_function_many(cpus
, ack_flush
, NULL
, wait
);
249 bool kvm_make_vcpus_request_mask(struct kvm
*kvm
, unsigned int req
,
250 unsigned long *vcpu_bitmap
, cpumask_var_t tmp
)
253 struct kvm_vcpu
*vcpu
;
258 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
259 if (vcpu_bitmap
&& !test_bit(i
, vcpu_bitmap
))
262 kvm_make_request(req
, vcpu
);
265 if (!(req
& KVM_REQUEST_NO_WAKEUP
) && kvm_vcpu_wake_up(vcpu
))
268 if (tmp
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
269 kvm_request_needs_ipi(vcpu
, req
))
270 __cpumask_set_cpu(cpu
, tmp
);
273 called
= kvm_kick_many_cpus(tmp
, !!(req
& KVM_REQUEST_WAIT
));
279 bool kvm_make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
284 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
286 called
= kvm_make_vcpus_request_mask(kvm
, req
, NULL
, cpus
);
288 free_cpumask_var(cpus
);
292 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
293 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
296 * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
297 * kvm_make_all_cpus_request.
299 long dirty_count
= smp_load_acquire(&kvm
->tlbs_dirty
);
302 * We want to publish modifications to the page tables before reading
303 * mode. Pairs with a memory barrier in arch-specific code.
304 * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest
305 * and smp_mb in walk_shadow_page_lockless_begin/end.
306 * - powerpc: smp_mb in kvmppc_prepare_to_enter.
308 * There is already an smp_mb__after_atomic() before
309 * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
312 if (!kvm_arch_flush_remote_tlb(kvm
)
313 || kvm_make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
314 ++kvm
->stat
.remote_tlb_flush
;
315 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
317 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs
);
320 void kvm_reload_remote_mmus(struct kvm
*kvm
)
322 kvm_make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
325 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
330 mutex_init(&vcpu
->mutex
);
335 init_swait_queue_head(&vcpu
->wq
);
336 kvm_async_pf_vcpu_init(vcpu
);
339 INIT_LIST_HEAD(&vcpu
->blocked_vcpu_list
);
341 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
346 vcpu
->run
= page_address(page
);
348 kvm_vcpu_set_in_spin_loop(vcpu
, false);
349 kvm_vcpu_set_dy_eligible(vcpu
, false);
350 vcpu
->preempted
= false;
353 r
= kvm_arch_vcpu_init(vcpu
);
359 free_page((unsigned long)vcpu
->run
);
363 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
365 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
368 * no need for rcu_read_lock as VCPU_RUN is the only place that
369 * will change the vcpu->pid pointer and on uninit all file
370 * descriptors are already gone.
372 put_pid(rcu_dereference_protected(vcpu
->pid
, 1));
373 kvm_arch_vcpu_uninit(vcpu
);
374 free_page((unsigned long)vcpu
->run
);
376 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
378 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
379 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
381 return container_of(mn
, struct kvm
, mmu_notifier
);
384 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
385 struct mm_struct
*mm
,
386 unsigned long address
,
389 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
392 idx
= srcu_read_lock(&kvm
->srcu
);
393 spin_lock(&kvm
->mmu_lock
);
394 kvm
->mmu_notifier_seq
++;
396 if (kvm_set_spte_hva(kvm
, address
, pte
))
397 kvm_flush_remote_tlbs(kvm
);
399 spin_unlock(&kvm
->mmu_lock
);
400 srcu_read_unlock(&kvm
->srcu
, idx
);
403 static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
404 const struct mmu_notifier_range
*range
)
406 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
407 int need_tlb_flush
= 0, idx
;
410 idx
= srcu_read_lock(&kvm
->srcu
);
411 spin_lock(&kvm
->mmu_lock
);
413 * The count increase must become visible at unlock time as no
414 * spte can be established without taking the mmu_lock and
415 * count is also read inside the mmu_lock critical section.
417 kvm
->mmu_notifier_count
++;
418 need_tlb_flush
= kvm_unmap_hva_range(kvm
, range
->start
, range
->end
);
419 need_tlb_flush
|= kvm
->tlbs_dirty
;
420 /* we've to flush the tlb before the pages can be freed */
422 kvm_flush_remote_tlbs(kvm
);
424 spin_unlock(&kvm
->mmu_lock
);
426 ret
= kvm_arch_mmu_notifier_invalidate_range(kvm
, range
->start
,
428 mmu_notifier_range_blockable(range
));
430 srcu_read_unlock(&kvm
->srcu
, idx
);
435 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
436 const struct mmu_notifier_range
*range
)
438 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
440 spin_lock(&kvm
->mmu_lock
);
442 * This sequence increase will notify the kvm page fault that
443 * the page that is going to be mapped in the spte could have
446 kvm
->mmu_notifier_seq
++;
449 * The above sequence increase must be visible before the
450 * below count decrease, which is ensured by the smp_wmb above
451 * in conjunction with the smp_rmb in mmu_notifier_retry().
453 kvm
->mmu_notifier_count
--;
454 spin_unlock(&kvm
->mmu_lock
);
456 BUG_ON(kvm
->mmu_notifier_count
< 0);
459 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
460 struct mm_struct
*mm
,
464 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
467 idx
= srcu_read_lock(&kvm
->srcu
);
468 spin_lock(&kvm
->mmu_lock
);
470 young
= kvm_age_hva(kvm
, start
, end
);
472 kvm_flush_remote_tlbs(kvm
);
474 spin_unlock(&kvm
->mmu_lock
);
475 srcu_read_unlock(&kvm
->srcu
, idx
);
480 static int kvm_mmu_notifier_clear_young(struct mmu_notifier
*mn
,
481 struct mm_struct
*mm
,
485 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
488 idx
= srcu_read_lock(&kvm
->srcu
);
489 spin_lock(&kvm
->mmu_lock
);
491 * Even though we do not flush TLB, this will still adversely
492 * affect performance on pre-Haswell Intel EPT, where there is
493 * no EPT Access Bit to clear so that we have to tear down EPT
494 * tables instead. If we find this unacceptable, we can always
495 * add a parameter to kvm_age_hva so that it effectively doesn't
496 * do anything on clear_young.
498 * Also note that currently we never issue secondary TLB flushes
499 * from clear_young, leaving this job up to the regular system
500 * cadence. If we find this inaccurate, we might come up with a
501 * more sophisticated heuristic later.
503 young
= kvm_age_hva(kvm
, start
, end
);
504 spin_unlock(&kvm
->mmu_lock
);
505 srcu_read_unlock(&kvm
->srcu
, idx
);
510 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
511 struct mm_struct
*mm
,
512 unsigned long address
)
514 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
517 idx
= srcu_read_lock(&kvm
->srcu
);
518 spin_lock(&kvm
->mmu_lock
);
519 young
= kvm_test_age_hva(kvm
, address
);
520 spin_unlock(&kvm
->mmu_lock
);
521 srcu_read_unlock(&kvm
->srcu
, idx
);
526 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
527 struct mm_struct
*mm
)
529 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
532 idx
= srcu_read_lock(&kvm
->srcu
);
533 kvm_arch_flush_shadow_all(kvm
);
534 srcu_read_unlock(&kvm
->srcu
, idx
);
537 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
538 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
539 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
540 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
541 .clear_young
= kvm_mmu_notifier_clear_young
,
542 .test_young
= kvm_mmu_notifier_test_young
,
543 .change_pte
= kvm_mmu_notifier_change_pte
,
544 .release
= kvm_mmu_notifier_release
,
547 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
549 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
550 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
553 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
555 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
560 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
562 static struct kvm_memslots
*kvm_alloc_memslots(void)
565 struct kvm_memslots
*slots
;
567 slots
= kvzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL_ACCOUNT
);
571 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
572 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
577 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
579 if (!memslot
->dirty_bitmap
)
582 kvfree(memslot
->dirty_bitmap
);
583 memslot
->dirty_bitmap
= NULL
;
587 * Free any memory in @free but not in @dont.
589 static void kvm_free_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
590 struct kvm_memory_slot
*dont
)
592 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
593 kvm_destroy_dirty_bitmap(free
);
595 kvm_arch_free_memslot(kvm
, free
, dont
);
600 static void kvm_free_memslots(struct kvm
*kvm
, struct kvm_memslots
*slots
)
602 struct kvm_memory_slot
*memslot
;
607 kvm_for_each_memslot(memslot
, slots
)
608 kvm_free_memslot(kvm
, memslot
, NULL
);
613 static void kvm_destroy_vm_debugfs(struct kvm
*kvm
)
617 if (!kvm
->debugfs_dentry
)
620 debugfs_remove_recursive(kvm
->debugfs_dentry
);
622 if (kvm
->debugfs_stat_data
) {
623 for (i
= 0; i
< kvm_debugfs_num_entries
; i
++)
624 kfree(kvm
->debugfs_stat_data
[i
]);
625 kfree(kvm
->debugfs_stat_data
);
629 static int kvm_create_vm_debugfs(struct kvm
*kvm
, int fd
)
631 char dir_name
[ITOA_MAX_LEN
* 2];
632 struct kvm_stat_data
*stat_data
;
633 struct kvm_stats_debugfs_item
*p
;
635 if (!debugfs_initialized())
638 snprintf(dir_name
, sizeof(dir_name
), "%d-%d", task_pid_nr(current
), fd
);
639 kvm
->debugfs_dentry
= debugfs_create_dir(dir_name
, kvm_debugfs_dir
);
641 kvm
->debugfs_stat_data
= kcalloc(kvm_debugfs_num_entries
,
642 sizeof(*kvm
->debugfs_stat_data
),
644 if (!kvm
->debugfs_stat_data
)
647 for (p
= debugfs_entries
; p
->name
; p
++) {
648 stat_data
= kzalloc(sizeof(*stat_data
), GFP_KERNEL_ACCOUNT
);
652 stat_data
->kvm
= kvm
;
653 stat_data
->offset
= p
->offset
;
654 stat_data
->mode
= p
->mode
? p
->mode
: 0644;
655 kvm
->debugfs_stat_data
[p
- debugfs_entries
] = stat_data
;
656 debugfs_create_file(p
->name
, stat_data
->mode
, kvm
->debugfs_dentry
,
657 stat_data
, stat_fops_per_vm
[p
->kind
]);
663 * Called after the VM is otherwise initialized, but just before adding it to
666 int __weak
kvm_arch_post_init_vm(struct kvm
*kvm
)
672 * Called just after removing the VM from the vm_list, but before doing any
675 void __weak
kvm_arch_pre_destroy_vm(struct kvm
*kvm
)
679 static struct kvm
*kvm_create_vm(unsigned long type
)
681 struct kvm
*kvm
= kvm_arch_alloc_vm();
686 return ERR_PTR(-ENOMEM
);
688 spin_lock_init(&kvm
->mmu_lock
);
690 kvm
->mm
= current
->mm
;
691 kvm_eventfd_init(kvm
);
692 mutex_init(&kvm
->lock
);
693 mutex_init(&kvm
->irq_lock
);
694 mutex_init(&kvm
->slots_lock
);
695 INIT_LIST_HEAD(&kvm
->devices
);
697 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
699 if (init_srcu_struct(&kvm
->srcu
))
700 goto out_err_no_srcu
;
701 if (init_srcu_struct(&kvm
->irq_srcu
))
702 goto out_err_no_irq_srcu
;
704 refcount_set(&kvm
->users_count
, 1);
705 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++) {
706 struct kvm_memslots
*slots
= kvm_alloc_memslots();
709 goto out_err_no_arch_destroy_vm
;
710 /* Generations must be different for each address space. */
711 slots
->generation
= i
;
712 rcu_assign_pointer(kvm
->memslots
[i
], slots
);
715 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
716 rcu_assign_pointer(kvm
->buses
[i
],
717 kzalloc(sizeof(struct kvm_io_bus
), GFP_KERNEL_ACCOUNT
));
719 goto out_err_no_arch_destroy_vm
;
722 r
= kvm_arch_init_vm(kvm
, type
);
724 goto out_err_no_arch_destroy_vm
;
726 r
= hardware_enable_all();
728 goto out_err_no_disable
;
730 #ifdef CONFIG_HAVE_KVM_IRQFD
731 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
734 r
= kvm_init_mmu_notifier(kvm
);
736 goto out_err_no_mmu_notifier
;
738 r
= kvm_arch_post_init_vm(kvm
);
742 mutex_lock(&kvm_lock
);
743 list_add(&kvm
->vm_list
, &vm_list
);
744 mutex_unlock(&kvm_lock
);
746 preempt_notifier_inc();
751 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
752 if (kvm
->mmu_notifier
.ops
)
753 mmu_notifier_unregister(&kvm
->mmu_notifier
, current
->mm
);
755 out_err_no_mmu_notifier
:
756 hardware_disable_all();
758 kvm_arch_destroy_vm(kvm
);
759 out_err_no_arch_destroy_vm
:
760 WARN_ON_ONCE(!refcount_dec_and_test(&kvm
->users_count
));
761 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
762 kfree(kvm_get_bus(kvm
, i
));
763 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
764 kvm_free_memslots(kvm
, __kvm_memslots(kvm
, i
));
765 cleanup_srcu_struct(&kvm
->irq_srcu
);
767 cleanup_srcu_struct(&kvm
->srcu
);
769 kvm_arch_free_vm(kvm
);
774 static void kvm_destroy_devices(struct kvm
*kvm
)
776 struct kvm_device
*dev
, *tmp
;
779 * We do not need to take the kvm->lock here, because nobody else
780 * has a reference to the struct kvm at this point and therefore
781 * cannot access the devices list anyhow.
783 list_for_each_entry_safe(dev
, tmp
, &kvm
->devices
, vm_node
) {
784 list_del(&dev
->vm_node
);
785 dev
->ops
->destroy(dev
);
789 static void kvm_destroy_vm(struct kvm
*kvm
)
792 struct mm_struct
*mm
= kvm
->mm
;
794 kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM
, kvm
);
795 kvm_destroy_vm_debugfs(kvm
);
796 kvm_arch_sync_events(kvm
);
797 mutex_lock(&kvm_lock
);
798 list_del(&kvm
->vm_list
);
799 mutex_unlock(&kvm_lock
);
800 kvm_arch_pre_destroy_vm(kvm
);
802 kvm_free_irq_routing(kvm
);
803 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
804 struct kvm_io_bus
*bus
= kvm_get_bus(kvm
, i
);
807 kvm_io_bus_destroy(bus
);
808 kvm
->buses
[i
] = NULL
;
810 kvm_coalesced_mmio_free(kvm
);
811 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
812 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
814 kvm_arch_flush_shadow_all(kvm
);
816 kvm_arch_destroy_vm(kvm
);
817 kvm_destroy_devices(kvm
);
818 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
819 kvm_free_memslots(kvm
, __kvm_memslots(kvm
, i
));
820 cleanup_srcu_struct(&kvm
->irq_srcu
);
821 cleanup_srcu_struct(&kvm
->srcu
);
822 kvm_arch_free_vm(kvm
);
823 preempt_notifier_dec();
824 hardware_disable_all();
828 void kvm_get_kvm(struct kvm
*kvm
)
830 refcount_inc(&kvm
->users_count
);
832 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
834 void kvm_put_kvm(struct kvm
*kvm
)
836 if (refcount_dec_and_test(&kvm
->users_count
))
839 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
842 * Used to put a reference that was taken on behalf of an object associated
843 * with a user-visible file descriptor, e.g. a vcpu or device, if installation
844 * of the new file descriptor fails and the reference cannot be transferred to
845 * its final owner. In such cases, the caller is still actively using @kvm and
846 * will fail miserably if the refcount unexpectedly hits zero.
848 void kvm_put_kvm_no_destroy(struct kvm
*kvm
)
850 WARN_ON(refcount_dec_and_test(&kvm
->users_count
));
852 EXPORT_SYMBOL_GPL(kvm_put_kvm_no_destroy
);
854 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
856 struct kvm
*kvm
= filp
->private_data
;
858 kvm_irqfd_release(kvm
);
865 * Allocation size is twice as large as the actual dirty bitmap size.
866 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
868 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
870 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
872 memslot
->dirty_bitmap
= kvzalloc(dirty_bytes
, GFP_KERNEL_ACCOUNT
);
873 if (!memslot
->dirty_bitmap
)
880 * Insert memslot and re-sort memslots based on their GFN,
881 * so binary search could be used to lookup GFN.
882 * Sorting algorithm takes advantage of having initially
883 * sorted array and known changed memslot position.
885 static void update_memslots(struct kvm_memslots
*slots
,
886 struct kvm_memory_slot
*new,
887 enum kvm_mr_change change
)
890 int i
= slots
->id_to_index
[id
];
891 struct kvm_memory_slot
*mslots
= slots
->memslots
;
893 WARN_ON(mslots
[i
].id
!= id
);
897 WARN_ON(mslots
[i
].npages
|| !new->npages
);
901 WARN_ON(new->npages
|| !mslots
[i
].npages
);
907 while (i
< KVM_MEM_SLOTS_NUM
- 1 &&
908 new->base_gfn
<= mslots
[i
+ 1].base_gfn
) {
909 if (!mslots
[i
+ 1].npages
)
911 mslots
[i
] = mslots
[i
+ 1];
912 slots
->id_to_index
[mslots
[i
].id
] = i
;
917 * The ">=" is needed when creating a slot with base_gfn == 0,
918 * so that it moves before all those with base_gfn == npages == 0.
920 * On the other hand, if new->npages is zero, the above loop has
921 * already left i pointing to the beginning of the empty part of
922 * mslots, and the ">=" would move the hole backwards in this
923 * case---which is wrong. So skip the loop when deleting a slot.
927 new->base_gfn
>= mslots
[i
- 1].base_gfn
) {
928 mslots
[i
] = mslots
[i
- 1];
929 slots
->id_to_index
[mslots
[i
].id
] = i
;
933 WARN_ON_ONCE(i
!= slots
->used_slots
);
936 slots
->id_to_index
[mslots
[i
].id
] = i
;
939 static int check_memory_region_flags(const struct kvm_userspace_memory_region
*mem
)
941 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
943 #ifdef __KVM_HAVE_READONLY_MEM
944 valid_flags
|= KVM_MEM_READONLY
;
947 if (mem
->flags
& ~valid_flags
)
953 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
954 int as_id
, struct kvm_memslots
*slots
)
956 struct kvm_memslots
*old_memslots
= __kvm_memslots(kvm
, as_id
);
957 u64 gen
= old_memslots
->generation
;
959 WARN_ON(gen
& KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS
);
960 slots
->generation
= gen
| KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS
;
962 rcu_assign_pointer(kvm
->memslots
[as_id
], slots
);
963 synchronize_srcu_expedited(&kvm
->srcu
);
966 * Increment the new memslot generation a second time, dropping the
967 * update in-progress flag and incrementing then generation based on
968 * the number of address spaces. This provides a unique and easily
969 * identifiable generation number while the memslots are in flux.
971 gen
= slots
->generation
& ~KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS
;
974 * Generations must be unique even across address spaces. We do not need
975 * a global counter for that, instead the generation space is evenly split
976 * across address spaces. For example, with two address spaces, address
977 * space 0 will use generations 0, 2, 4, ... while address space 1 will
978 * use generations 1, 3, 5, ...
980 gen
+= KVM_ADDRESS_SPACE_NUM
;
982 kvm_arch_memslots_updated(kvm
, gen
);
984 slots
->generation
= gen
;
990 * Allocate some memory and give it an address in the guest physical address
993 * Discontiguous memory is allowed, mostly for framebuffers.
995 * Must be called holding kvm->slots_lock for write.
997 int __kvm_set_memory_region(struct kvm
*kvm
,
998 const struct kvm_userspace_memory_region
*mem
)
1002 unsigned long npages
;
1003 struct kvm_memory_slot
*slot
;
1004 struct kvm_memory_slot old
, new;
1005 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
1007 enum kvm_mr_change change
;
1009 r
= check_memory_region_flags(mem
);
1014 as_id
= mem
->slot
>> 16;
1015 id
= (u16
)mem
->slot
;
1017 /* General sanity checks */
1018 if (mem
->memory_size
& (PAGE_SIZE
- 1))
1020 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
1022 /* We can read the guest memory with __xxx_user() later on. */
1023 if ((id
< KVM_USER_MEM_SLOTS
) &&
1024 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
1025 !access_ok((void __user
*)(unsigned long)mem
->userspace_addr
,
1028 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_MEM_SLOTS_NUM
)
1030 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
1033 slot
= id_to_memslot(__kvm_memslots(kvm
, as_id
), id
);
1034 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
1035 npages
= mem
->memory_size
>> PAGE_SHIFT
;
1037 if (npages
> KVM_MEM_MAX_NR_PAGES
)
1043 new.base_gfn
= base_gfn
;
1044 new.npages
= npages
;
1045 new.flags
= mem
->flags
;
1049 change
= KVM_MR_CREATE
;
1050 else { /* Modify an existing slot. */
1051 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
1052 (npages
!= old
.npages
) ||
1053 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
1056 if (base_gfn
!= old
.base_gfn
)
1057 change
= KVM_MR_MOVE
;
1058 else if (new.flags
!= old
.flags
)
1059 change
= KVM_MR_FLAGS_ONLY
;
1060 else { /* Nothing to change. */
1069 change
= KVM_MR_DELETE
;
1074 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
1075 /* Check for overlaps */
1077 kvm_for_each_memslot(slot
, __kvm_memslots(kvm
, as_id
)) {
1080 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
1081 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
1086 /* Free page dirty bitmap if unneeded */
1087 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
1088 new.dirty_bitmap
= NULL
;
1091 if (change
== KVM_MR_CREATE
) {
1092 new.userspace_addr
= mem
->userspace_addr
;
1094 if (kvm_arch_create_memslot(kvm
, &new, npages
))
1098 /* Allocate page dirty bitmap if needed */
1099 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
1100 if (kvm_create_dirty_bitmap(&new) < 0)
1104 slots
= kvzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL_ACCOUNT
);
1107 memcpy(slots
, __kvm_memslots(kvm
, as_id
), sizeof(struct kvm_memslots
));
1109 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
1110 slot
= id_to_memslot(slots
, id
);
1111 slot
->flags
|= KVM_MEMSLOT_INVALID
;
1113 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
1115 /* From this point no new shadow pages pointing to a deleted,
1116 * or moved, memslot will be created.
1118 * validation of sp->gfn happens in:
1119 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
1120 * - kvm_is_visible_gfn (mmu_check_roots)
1122 kvm_arch_flush_shadow_memslot(kvm
, slot
);
1125 * We can re-use the old_memslots from above, the only difference
1126 * from the currently installed memslots is the invalid flag. This
1127 * will get overwritten by update_memslots anyway.
1129 slots
= old_memslots
;
1132 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
1136 /* actual memory is freed via old in kvm_free_memslot below */
1137 if (change
== KVM_MR_DELETE
) {
1138 new.dirty_bitmap
= NULL
;
1139 memset(&new.arch
, 0, sizeof(new.arch
));
1142 update_memslots(slots
, &new, change
);
1143 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
1145 kvm_arch_commit_memory_region(kvm
, mem
, &old
, &new, change
);
1147 kvm_free_memslot(kvm
, &old
, &new);
1148 kvfree(old_memslots
);
1154 kvm_free_memslot(kvm
, &new, &old
);
1158 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
1160 int kvm_set_memory_region(struct kvm
*kvm
,
1161 const struct kvm_userspace_memory_region
*mem
)
1165 mutex_lock(&kvm
->slots_lock
);
1166 r
= __kvm_set_memory_region(kvm
, mem
);
1167 mutex_unlock(&kvm
->slots_lock
);
1170 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
1172 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
1173 struct kvm_userspace_memory_region
*mem
)
1175 if ((u16
)mem
->slot
>= KVM_USER_MEM_SLOTS
)
1178 return kvm_set_memory_region(kvm
, mem
);
1181 int kvm_get_dirty_log(struct kvm
*kvm
,
1182 struct kvm_dirty_log
*log
, int *is_dirty
)
1184 struct kvm_memslots
*slots
;
1185 struct kvm_memory_slot
*memslot
;
1188 unsigned long any
= 0;
1190 as_id
= log
->slot
>> 16;
1191 id
= (u16
)log
->slot
;
1192 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1195 slots
= __kvm_memslots(kvm
, as_id
);
1196 memslot
= id_to_memslot(slots
, id
);
1197 if (!memslot
->dirty_bitmap
)
1200 n
= kvm_dirty_bitmap_bytes(memslot
);
1202 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
1203 any
= memslot
->dirty_bitmap
[i
];
1205 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
1212 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
1214 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1216 * kvm_get_dirty_log_protect - get a snapshot of dirty pages
1217 * and reenable dirty page tracking for the corresponding pages.
1218 * @kvm: pointer to kvm instance
1219 * @log: slot id and address to which we copy the log
1220 * @flush: true if TLB flush is needed by caller
1222 * We need to keep it in mind that VCPU threads can write to the bitmap
1223 * concurrently. So, to avoid losing track of dirty pages we keep the
1226 * 1. Take a snapshot of the bit and clear it if needed.
1227 * 2. Write protect the corresponding page.
1228 * 3. Copy the snapshot to the userspace.
1229 * 4. Upon return caller flushes TLB's if needed.
1231 * Between 2 and 4, the guest may write to the page using the remaining TLB
1232 * entry. This is not a problem because the page is reported dirty using
1233 * the snapshot taken before and step 4 ensures that writes done after
1234 * exiting to userspace will be logged for the next call.
1237 int kvm_get_dirty_log_protect(struct kvm
*kvm
,
1238 struct kvm_dirty_log
*log
, bool *flush
)
1240 struct kvm_memslots
*slots
;
1241 struct kvm_memory_slot
*memslot
;
1244 unsigned long *dirty_bitmap
;
1245 unsigned long *dirty_bitmap_buffer
;
1247 as_id
= log
->slot
>> 16;
1248 id
= (u16
)log
->slot
;
1249 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1252 slots
= __kvm_memslots(kvm
, as_id
);
1253 memslot
= id_to_memslot(slots
, id
);
1255 dirty_bitmap
= memslot
->dirty_bitmap
;
1259 n
= kvm_dirty_bitmap_bytes(memslot
);
1261 if (kvm
->manual_dirty_log_protect
) {
1263 * Unlike kvm_get_dirty_log, we always return false in *flush,
1264 * because no flush is needed until KVM_CLEAR_DIRTY_LOG. There
1265 * is some code duplication between this function and
1266 * kvm_get_dirty_log, but hopefully all architecture
1267 * transition to kvm_get_dirty_log_protect and kvm_get_dirty_log
1268 * can be eliminated.
1270 dirty_bitmap_buffer
= dirty_bitmap
;
1272 dirty_bitmap_buffer
= kvm_second_dirty_bitmap(memslot
);
1273 memset(dirty_bitmap_buffer
, 0, n
);
1275 spin_lock(&kvm
->mmu_lock
);
1276 for (i
= 0; i
< n
/ sizeof(long); i
++) {
1280 if (!dirty_bitmap
[i
])
1284 mask
= xchg(&dirty_bitmap
[i
], 0);
1285 dirty_bitmap_buffer
[i
] = mask
;
1287 offset
= i
* BITS_PER_LONG
;
1288 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
,
1291 spin_unlock(&kvm
->mmu_lock
);
1294 if (copy_to_user(log
->dirty_bitmap
, dirty_bitmap_buffer
, n
))
1298 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect
);
1301 * kvm_clear_dirty_log_protect - clear dirty bits in the bitmap
1302 * and reenable dirty page tracking for the corresponding pages.
1303 * @kvm: pointer to kvm instance
1304 * @log: slot id and address from which to fetch the bitmap of dirty pages
1305 * @flush: true if TLB flush is needed by caller
1307 int kvm_clear_dirty_log_protect(struct kvm
*kvm
,
1308 struct kvm_clear_dirty_log
*log
, bool *flush
)
1310 struct kvm_memslots
*slots
;
1311 struct kvm_memory_slot
*memslot
;
1315 unsigned long *dirty_bitmap
;
1316 unsigned long *dirty_bitmap_buffer
;
1318 as_id
= log
->slot
>> 16;
1319 id
= (u16
)log
->slot
;
1320 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1323 if (log
->first_page
& 63)
1326 slots
= __kvm_memslots(kvm
, as_id
);
1327 memslot
= id_to_memslot(slots
, id
);
1329 dirty_bitmap
= memslot
->dirty_bitmap
;
1333 n
= ALIGN(log
->num_pages
, BITS_PER_LONG
) / 8;
1335 if (log
->first_page
> memslot
->npages
||
1336 log
->num_pages
> memslot
->npages
- log
->first_page
||
1337 (log
->num_pages
< memslot
->npages
- log
->first_page
&& (log
->num_pages
& 63)))
1341 dirty_bitmap_buffer
= kvm_second_dirty_bitmap(memslot
);
1342 if (copy_from_user(dirty_bitmap_buffer
, log
->dirty_bitmap
, n
))
1345 spin_lock(&kvm
->mmu_lock
);
1346 for (offset
= log
->first_page
, i
= offset
/ BITS_PER_LONG
,
1347 n
= DIV_ROUND_UP(log
->num_pages
, BITS_PER_LONG
); n
--;
1348 i
++, offset
+= BITS_PER_LONG
) {
1349 unsigned long mask
= *dirty_bitmap_buffer
++;
1350 atomic_long_t
*p
= (atomic_long_t
*) &dirty_bitmap
[i
];
1354 mask
&= atomic_long_fetch_andnot(mask
, p
);
1357 * mask contains the bits that really have been cleared. This
1358 * never includes any bits beyond the length of the memslot (if
1359 * the length is not aligned to 64 pages), therefore it is not
1360 * a problem if userspace sets them in log->dirty_bitmap.
1364 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
,
1368 spin_unlock(&kvm
->mmu_lock
);
1372 EXPORT_SYMBOL_GPL(kvm_clear_dirty_log_protect
);
1375 bool kvm_largepages_enabled(void)
1377 return largepages_enabled
;
1380 void kvm_disable_largepages(void)
1382 largepages_enabled
= false;
1384 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
1386 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1388 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1390 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1392 struct kvm_memory_slot
*kvm_vcpu_gfn_to_memslot(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1394 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu
), gfn
);
1397 bool kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1399 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1401 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1402 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1407 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1409 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1411 struct vm_area_struct
*vma
;
1412 unsigned long addr
, size
;
1416 addr
= gfn_to_hva(kvm
, gfn
);
1417 if (kvm_is_error_hva(addr
))
1420 down_read(¤t
->mm
->mmap_sem
);
1421 vma
= find_vma(current
->mm
, addr
);
1425 size
= vma_kernel_pagesize(vma
);
1428 up_read(¤t
->mm
->mmap_sem
);
1433 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1435 return slot
->flags
& KVM_MEM_READONLY
;
1438 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1439 gfn_t
*nr_pages
, bool write
)
1441 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1442 return KVM_HVA_ERR_BAD
;
1444 if (memslot_is_readonly(slot
) && write
)
1445 return KVM_HVA_ERR_RO_BAD
;
1448 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1450 return __gfn_to_hva_memslot(slot
, gfn
);
1453 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1456 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1459 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1462 return gfn_to_hva_many(slot
, gfn
, NULL
);
1464 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1466 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1468 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1470 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1472 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1474 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
, NULL
);
1476 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva
);
1479 * Return the hva of a @gfn and the R/W attribute if possible.
1481 * @slot: the kvm_memory_slot which contains @gfn
1482 * @gfn: the gfn to be translated
1483 * @writable: used to return the read/write attribute of the @slot if the hva
1484 * is valid and @writable is not NULL
1486 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot
*slot
,
1487 gfn_t gfn
, bool *writable
)
1489 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1491 if (!kvm_is_error_hva(hva
) && writable
)
1492 *writable
= !memslot_is_readonly(slot
);
1497 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1499 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1501 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1504 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu
*vcpu
, gfn_t gfn
, bool *writable
)
1506 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1508 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1511 static inline int check_user_page_hwpoison(unsigned long addr
)
1513 int rc
, flags
= FOLL_HWPOISON
| FOLL_WRITE
;
1515 rc
= get_user_pages(addr
, 1, flags
, NULL
, NULL
);
1516 return rc
== -EHWPOISON
;
1520 * The fast path to get the writable pfn which will be stored in @pfn,
1521 * true indicates success, otherwise false is returned. It's also the
1522 * only part that runs if we can are in atomic context.
1524 static bool hva_to_pfn_fast(unsigned long addr
, bool write_fault
,
1525 bool *writable
, kvm_pfn_t
*pfn
)
1527 struct page
*page
[1];
1531 * Fast pin a writable pfn only if it is a write fault request
1532 * or the caller allows to map a writable pfn for a read fault
1535 if (!(write_fault
|| writable
))
1538 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1540 *pfn
= page_to_pfn(page
[0]);
1551 * The slow path to get the pfn of the specified host virtual address,
1552 * 1 indicates success, -errno is returned if error is detected.
1554 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1555 bool *writable
, kvm_pfn_t
*pfn
)
1557 unsigned int flags
= FOLL_HWPOISON
;
1564 *writable
= write_fault
;
1567 flags
|= FOLL_WRITE
;
1569 flags
|= FOLL_NOWAIT
;
1571 npages
= get_user_pages_unlocked(addr
, 1, &page
, flags
);
1575 /* map read fault as writable if possible */
1576 if (unlikely(!write_fault
) && writable
) {
1579 if (__get_user_pages_fast(addr
, 1, 1, &wpage
) == 1) {
1585 *pfn
= page_to_pfn(page
);
1589 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1591 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1594 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1600 static int hva_to_pfn_remapped(struct vm_area_struct
*vma
,
1601 unsigned long addr
, bool *async
,
1602 bool write_fault
, bool *writable
,
1608 r
= follow_pfn(vma
, addr
, &pfn
);
1611 * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
1612 * not call the fault handler, so do it here.
1614 bool unlocked
= false;
1615 r
= fixup_user_fault(current
, current
->mm
, addr
,
1616 (write_fault
? FAULT_FLAG_WRITE
: 0),
1623 r
= follow_pfn(vma
, addr
, &pfn
);
1633 * Get a reference here because callers of *hva_to_pfn* and
1634 * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the
1635 * returned pfn. This is only needed if the VMA has VM_MIXEDMAP
1636 * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will
1637 * simply do nothing for reserved pfns.
1639 * Whoever called remap_pfn_range is also going to call e.g.
1640 * unmap_mapping_range before the underlying pages are freed,
1641 * causing a call to our MMU notifier.
1650 * Pin guest page in memory and return its pfn.
1651 * @addr: host virtual address which maps memory to the guest
1652 * @atomic: whether this function can sleep
1653 * @async: whether this function need to wait IO complete if the
1654 * host page is not in the memory
1655 * @write_fault: whether we should get a writable host page
1656 * @writable: whether it allows to map a writable host page for !@write_fault
1658 * The function will map a writable host page for these two cases:
1659 * 1): @write_fault = true
1660 * 2): @write_fault = false && @writable, @writable will tell the caller
1661 * whether the mapping is writable.
1663 static kvm_pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1664 bool write_fault
, bool *writable
)
1666 struct vm_area_struct
*vma
;
1670 /* we can do it either atomically or asynchronously, not both */
1671 BUG_ON(atomic
&& async
);
1673 if (hva_to_pfn_fast(addr
, write_fault
, writable
, &pfn
))
1677 return KVM_PFN_ERR_FAULT
;
1679 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1683 down_read(¤t
->mm
->mmap_sem
);
1684 if (npages
== -EHWPOISON
||
1685 (!async
&& check_user_page_hwpoison(addr
))) {
1686 pfn
= KVM_PFN_ERR_HWPOISON
;
1691 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1694 pfn
= KVM_PFN_ERR_FAULT
;
1695 else if (vma
->vm_flags
& (VM_IO
| VM_PFNMAP
)) {
1696 r
= hva_to_pfn_remapped(vma
, addr
, async
, write_fault
, writable
, &pfn
);
1700 pfn
= KVM_PFN_ERR_FAULT
;
1702 if (async
&& vma_is_valid(vma
, write_fault
))
1704 pfn
= KVM_PFN_ERR_FAULT
;
1707 up_read(¤t
->mm
->mmap_sem
);
1711 kvm_pfn_t
__gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1712 bool atomic
, bool *async
, bool write_fault
,
1715 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1717 if (addr
== KVM_HVA_ERR_RO_BAD
) {
1720 return KVM_PFN_ERR_RO_FAULT
;
1723 if (kvm_is_error_hva(addr
)) {
1726 return KVM_PFN_NOSLOT
;
1729 /* Do not map writable pfn in the readonly memslot. */
1730 if (writable
&& memslot_is_readonly(slot
)) {
1735 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1738 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot
);
1740 kvm_pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1743 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
, false, NULL
,
1744 write_fault
, writable
);
1746 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1748 kvm_pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1750 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1752 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot
);
1754 kvm_pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1756 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1758 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1760 kvm_pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1762 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm
, gfn
), gfn
);
1764 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1766 kvm_pfn_t
kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1768 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1770 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic
);
1772 kvm_pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1774 return gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
);
1776 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1778 kvm_pfn_t
kvm_vcpu_gfn_to_pfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1780 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1782 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn
);
1784 int gfn_to_page_many_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1785 struct page
**pages
, int nr_pages
)
1790 addr
= gfn_to_hva_many(slot
, gfn
, &entry
);
1791 if (kvm_is_error_hva(addr
))
1794 if (entry
< nr_pages
)
1797 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1799 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1801 static struct page
*kvm_pfn_to_page(kvm_pfn_t pfn
)
1803 if (is_error_noslot_pfn(pfn
))
1804 return KVM_ERR_PTR_BAD_PAGE
;
1806 if (kvm_is_reserved_pfn(pfn
)) {
1808 return KVM_ERR_PTR_BAD_PAGE
;
1811 return pfn_to_page(pfn
);
1814 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1818 pfn
= gfn_to_pfn(kvm
, gfn
);
1820 return kvm_pfn_to_page(pfn
);
1822 EXPORT_SYMBOL_GPL(gfn_to_page
);
1824 static int __kvm_map_gfn(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1825 struct kvm_host_map
*map
)
1829 struct page
*page
= KVM_UNMAPPED_PAGE
;
1834 pfn
= gfn_to_pfn_memslot(slot
, gfn
);
1835 if (is_error_noslot_pfn(pfn
))
1838 if (pfn_valid(pfn
)) {
1839 page
= pfn_to_page(pfn
);
1841 #ifdef CONFIG_HAS_IOMEM
1843 hva
= memremap(pfn_to_hpa(pfn
), PAGE_SIZE
, MEMREMAP_WB
);
1858 int kvm_vcpu_map(struct kvm_vcpu
*vcpu
, gfn_t gfn
, struct kvm_host_map
*map
)
1860 return __kvm_map_gfn(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
, map
);
1862 EXPORT_SYMBOL_GPL(kvm_vcpu_map
);
1864 void kvm_vcpu_unmap(struct kvm_vcpu
*vcpu
, struct kvm_host_map
*map
,
1873 if (map
->page
!= KVM_UNMAPPED_PAGE
)
1875 #ifdef CONFIG_HAS_IOMEM
1881 kvm_vcpu_mark_page_dirty(vcpu
, map
->gfn
);
1882 kvm_release_pfn_dirty(map
->pfn
);
1884 kvm_release_pfn_clean(map
->pfn
);
1890 EXPORT_SYMBOL_GPL(kvm_vcpu_unmap
);
1892 struct page
*kvm_vcpu_gfn_to_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1896 pfn
= kvm_vcpu_gfn_to_pfn(vcpu
, gfn
);
1898 return kvm_pfn_to_page(pfn
);
1900 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page
);
1902 void kvm_release_page_clean(struct page
*page
)
1904 WARN_ON(is_error_page(page
));
1906 kvm_release_pfn_clean(page_to_pfn(page
));
1908 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1910 void kvm_release_pfn_clean(kvm_pfn_t pfn
)
1912 if (!is_error_noslot_pfn(pfn
) && !kvm_is_reserved_pfn(pfn
))
1913 put_page(pfn_to_page(pfn
));
1915 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1917 void kvm_release_page_dirty(struct page
*page
)
1919 WARN_ON(is_error_page(page
));
1921 kvm_release_pfn_dirty(page_to_pfn(page
));
1923 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1925 void kvm_release_pfn_dirty(kvm_pfn_t pfn
)
1927 kvm_set_pfn_dirty(pfn
);
1928 kvm_release_pfn_clean(pfn
);
1930 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1932 void kvm_set_pfn_dirty(kvm_pfn_t pfn
)
1934 if (!kvm_is_reserved_pfn(pfn
) && !kvm_is_zone_device_pfn(pfn
)) {
1935 struct page
*page
= pfn_to_page(pfn
);
1940 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1942 void kvm_set_pfn_accessed(kvm_pfn_t pfn
)
1944 if (!kvm_is_reserved_pfn(pfn
) && !kvm_is_zone_device_pfn(pfn
))
1945 mark_page_accessed(pfn_to_page(pfn
));
1947 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1949 void kvm_get_pfn(kvm_pfn_t pfn
)
1951 if (!kvm_is_reserved_pfn(pfn
))
1952 get_page(pfn_to_page(pfn
));
1954 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1956 static int next_segment(unsigned long len
, int offset
)
1958 if (len
> PAGE_SIZE
- offset
)
1959 return PAGE_SIZE
- offset
;
1964 static int __kvm_read_guest_page(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1965 void *data
, int offset
, int len
)
1970 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1971 if (kvm_is_error_hva(addr
))
1973 r
= __copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1979 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1982 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1984 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1986 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1988 int kvm_vcpu_read_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
, void *data
,
1989 int offset
, int len
)
1991 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1993 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1995 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page
);
1997 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1999 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2001 int offset
= offset_in_page(gpa
);
2004 while ((seg
= next_segment(len
, offset
)) != 0) {
2005 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
2015 EXPORT_SYMBOL_GPL(kvm_read_guest
);
2017 int kvm_vcpu_read_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, void *data
, unsigned long len
)
2019 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2021 int offset
= offset_in_page(gpa
);
2024 while ((seg
= next_segment(len
, offset
)) != 0) {
2025 ret
= kvm_vcpu_read_guest_page(vcpu
, gfn
, data
, offset
, seg
);
2035 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest
);
2037 static int __kvm_read_guest_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
2038 void *data
, int offset
, unsigned long len
)
2043 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
2044 if (kvm_is_error_hva(addr
))
2046 pagefault_disable();
2047 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
2054 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
2057 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2058 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
2059 int offset
= offset_in_page(gpa
);
2061 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
2063 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic
);
2065 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
2066 void *data
, unsigned long len
)
2068 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2069 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2070 int offset
= offset_in_page(gpa
);
2072 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
2074 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic
);
2076 static int __kvm_write_guest_page(struct kvm_memory_slot
*memslot
, gfn_t gfn
,
2077 const void *data
, int offset
, int len
)
2082 addr
= gfn_to_hva_memslot(memslot
, gfn
);
2083 if (kvm_is_error_hva(addr
))
2085 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
2088 mark_page_dirty_in_slot(memslot
, gfn
);
2092 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
,
2093 const void *data
, int offset
, int len
)
2095 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
2097 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
2099 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
2101 int kvm_vcpu_write_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
,
2102 const void *data
, int offset
, int len
)
2104 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2106 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
2108 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page
);
2110 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
2113 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2115 int offset
= offset_in_page(gpa
);
2118 while ((seg
= next_segment(len
, offset
)) != 0) {
2119 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
2129 EXPORT_SYMBOL_GPL(kvm_write_guest
);
2131 int kvm_vcpu_write_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, const void *data
,
2134 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2136 int offset
= offset_in_page(gpa
);
2139 while ((seg
= next_segment(len
, offset
)) != 0) {
2140 ret
= kvm_vcpu_write_guest_page(vcpu
, gfn
, data
, offset
, seg
);
2150 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest
);
2152 static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots
*slots
,
2153 struct gfn_to_hva_cache
*ghc
,
2154 gpa_t gpa
, unsigned long len
)
2156 int offset
= offset_in_page(gpa
);
2157 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
2158 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
2159 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
2160 gfn_t nr_pages_avail
;
2161 int r
= start_gfn
<= end_gfn
? 0 : -EINVAL
;
2164 ghc
->generation
= slots
->generation
;
2166 ghc
->hva
= KVM_HVA_ERR_BAD
;
2169 * If the requested region crosses two memslots, we still
2170 * verify that the entire region is valid here.
2172 while (!r
&& start_gfn
<= end_gfn
) {
2173 ghc
->memslot
= __gfn_to_memslot(slots
, start_gfn
);
2174 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
2176 if (kvm_is_error_hva(ghc
->hva
))
2178 start_gfn
+= nr_pages_avail
;
2181 /* Use the slow path for cross page reads and writes. */
2182 if (!r
&& nr_pages_needed
== 1)
2185 ghc
->memslot
= NULL
;
2190 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2191 gpa_t gpa
, unsigned long len
)
2193 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
2194 return __kvm_gfn_to_hva_cache_init(slots
, ghc
, gpa
, len
);
2196 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
2198 int kvm_write_guest_offset_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2199 void *data
, unsigned int offset
,
2202 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
2204 gpa_t gpa
= ghc
->gpa
+ offset
;
2206 BUG_ON(len
+ offset
> ghc
->len
);
2208 if (slots
->generation
!= ghc
->generation
)
2209 __kvm_gfn_to_hva_cache_init(slots
, ghc
, ghc
->gpa
, ghc
->len
);
2211 if (unlikely(!ghc
->memslot
))
2212 return kvm_write_guest(kvm
, gpa
, data
, len
);
2214 if (kvm_is_error_hva(ghc
->hva
))
2217 r
= __copy_to_user((void __user
*)ghc
->hva
+ offset
, data
, len
);
2220 mark_page_dirty_in_slot(ghc
->memslot
, gpa
>> PAGE_SHIFT
);
2224 EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached
);
2226 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2227 void *data
, unsigned long len
)
2229 return kvm_write_guest_offset_cached(kvm
, ghc
, data
, 0, len
);
2231 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
2233 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2234 void *data
, unsigned long len
)
2236 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
2239 BUG_ON(len
> ghc
->len
);
2241 if (slots
->generation
!= ghc
->generation
)
2242 __kvm_gfn_to_hva_cache_init(slots
, ghc
, ghc
->gpa
, ghc
->len
);
2244 if (unlikely(!ghc
->memslot
))
2245 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
2247 if (kvm_is_error_hva(ghc
->hva
))
2250 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
2256 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
2258 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
2260 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2262 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
2264 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
2266 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
2268 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2270 int offset
= offset_in_page(gpa
);
2273 while ((seg
= next_segment(len
, offset
)) != 0) {
2274 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
2283 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
2285 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
,
2288 if (memslot
&& memslot
->dirty_bitmap
) {
2289 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
2291 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
2295 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
2297 struct kvm_memory_slot
*memslot
;
2299 memslot
= gfn_to_memslot(kvm
, gfn
);
2300 mark_page_dirty_in_slot(memslot
, gfn
);
2302 EXPORT_SYMBOL_GPL(mark_page_dirty
);
2304 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
2306 struct kvm_memory_slot
*memslot
;
2308 memslot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2309 mark_page_dirty_in_slot(memslot
, gfn
);
2311 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty
);
2313 void kvm_sigset_activate(struct kvm_vcpu
*vcpu
)
2315 if (!vcpu
->sigset_active
)
2319 * This does a lockless modification of ->real_blocked, which is fine
2320 * because, only current can change ->real_blocked and all readers of
2321 * ->real_blocked don't care as long ->real_blocked is always a subset
2324 sigprocmask(SIG_SETMASK
, &vcpu
->sigset
, ¤t
->real_blocked
);
2327 void kvm_sigset_deactivate(struct kvm_vcpu
*vcpu
)
2329 if (!vcpu
->sigset_active
)
2332 sigprocmask(SIG_SETMASK
, ¤t
->real_blocked
, NULL
);
2333 sigemptyset(¤t
->real_blocked
);
2336 static void grow_halt_poll_ns(struct kvm_vcpu
*vcpu
)
2338 unsigned int old
, val
, grow
, grow_start
;
2340 old
= val
= vcpu
->halt_poll_ns
;
2341 grow_start
= READ_ONCE(halt_poll_ns_grow_start
);
2342 grow
= READ_ONCE(halt_poll_ns_grow
);
2347 if (val
< grow_start
)
2350 if (val
> halt_poll_ns
)
2353 vcpu
->halt_poll_ns
= val
;
2355 trace_kvm_halt_poll_ns_grow(vcpu
->vcpu_id
, val
, old
);
2358 static void shrink_halt_poll_ns(struct kvm_vcpu
*vcpu
)
2360 unsigned int old
, val
, shrink
;
2362 old
= val
= vcpu
->halt_poll_ns
;
2363 shrink
= READ_ONCE(halt_poll_ns_shrink
);
2369 vcpu
->halt_poll_ns
= val
;
2370 trace_kvm_halt_poll_ns_shrink(vcpu
->vcpu_id
, val
, old
);
2373 static int kvm_vcpu_check_block(struct kvm_vcpu
*vcpu
)
2376 int idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
2378 if (kvm_arch_vcpu_runnable(vcpu
)) {
2379 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
2382 if (kvm_cpu_has_pending_timer(vcpu
))
2384 if (signal_pending(current
))
2389 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
2394 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
2396 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
2399 DECLARE_SWAITQUEUE(wait
);
2400 bool waited
= false;
2403 kvm_arch_vcpu_blocking(vcpu
);
2405 start
= cur
= ktime_get();
2406 if (vcpu
->halt_poll_ns
&& !kvm_arch_no_poll(vcpu
)) {
2407 ktime_t stop
= ktime_add_ns(ktime_get(), vcpu
->halt_poll_ns
);
2409 ++vcpu
->stat
.halt_attempted_poll
;
2412 * This sets KVM_REQ_UNHALT if an interrupt
2415 if (kvm_vcpu_check_block(vcpu
) < 0) {
2416 ++vcpu
->stat
.halt_successful_poll
;
2417 if (!vcpu_valid_wakeup(vcpu
))
2418 ++vcpu
->stat
.halt_poll_invalid
;
2422 } while (single_task_running() && ktime_before(cur
, stop
));
2426 prepare_to_swait_exclusive(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
2428 if (kvm_vcpu_check_block(vcpu
) < 0)
2435 finish_swait(&vcpu
->wq
, &wait
);
2438 kvm_arch_vcpu_unblocking(vcpu
);
2439 block_ns
= ktime_to_ns(cur
) - ktime_to_ns(start
);
2441 if (!kvm_arch_no_poll(vcpu
)) {
2442 if (!vcpu_valid_wakeup(vcpu
)) {
2443 shrink_halt_poll_ns(vcpu
);
2444 } else if (halt_poll_ns
) {
2445 if (block_ns
<= vcpu
->halt_poll_ns
)
2447 /* we had a long block, shrink polling */
2448 else if (vcpu
->halt_poll_ns
&& block_ns
> halt_poll_ns
)
2449 shrink_halt_poll_ns(vcpu
);
2450 /* we had a short halt and our poll time is too small */
2451 else if (vcpu
->halt_poll_ns
< halt_poll_ns
&&
2452 block_ns
< halt_poll_ns
)
2453 grow_halt_poll_ns(vcpu
);
2455 vcpu
->halt_poll_ns
= 0;
2459 trace_kvm_vcpu_wakeup(block_ns
, waited
, vcpu_valid_wakeup(vcpu
));
2460 kvm_arch_vcpu_block_finish(vcpu
);
2462 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
2464 bool kvm_vcpu_wake_up(struct kvm_vcpu
*vcpu
)
2466 struct swait_queue_head
*wqp
;
2468 wqp
= kvm_arch_vcpu_wq(vcpu
);
2469 if (swq_has_sleeper(wqp
)) {
2471 WRITE_ONCE(vcpu
->ready
, true);
2472 ++vcpu
->stat
.halt_wakeup
;
2478 EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up
);
2482 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2484 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
2487 int cpu
= vcpu
->cpu
;
2489 if (kvm_vcpu_wake_up(vcpu
))
2493 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
2494 if (kvm_arch_vcpu_should_kick(vcpu
))
2495 smp_send_reschedule(cpu
);
2498 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
2499 #endif /* !CONFIG_S390 */
2501 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
2504 struct task_struct
*task
= NULL
;
2508 pid
= rcu_dereference(target
->pid
);
2510 task
= get_pid_task(pid
, PIDTYPE_PID
);
2514 ret
= yield_to(task
, 1);
2515 put_task_struct(task
);
2519 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
2522 * Helper that checks whether a VCPU is eligible for directed yield.
2523 * Most eligible candidate to yield is decided by following heuristics:
2525 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2526 * (preempted lock holder), indicated by @in_spin_loop.
2527 * Set at the beiginning and cleared at the end of interception/PLE handler.
2529 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2530 * chance last time (mostly it has become eligible now since we have probably
2531 * yielded to lockholder in last iteration. This is done by toggling
2532 * @dy_eligible each time a VCPU checked for eligibility.)
2534 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2535 * to preempted lock-holder could result in wrong VCPU selection and CPU
2536 * burning. Giving priority for a potential lock-holder increases lock
2539 * Since algorithm is based on heuristics, accessing another VCPU data without
2540 * locking does not harm. It may result in trying to yield to same VCPU, fail
2541 * and continue with next VCPU and so on.
2543 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
2545 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2548 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
2549 vcpu
->spin_loop
.dy_eligible
;
2551 if (vcpu
->spin_loop
.in_spin_loop
)
2552 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
2561 * Unlike kvm_arch_vcpu_runnable, this function is called outside
2562 * a vcpu_load/vcpu_put pair. However, for most architectures
2563 * kvm_arch_vcpu_runnable does not require vcpu_load.
2565 bool __weak
kvm_arch_dy_runnable(struct kvm_vcpu
*vcpu
)
2567 return kvm_arch_vcpu_runnable(vcpu
);
2570 static bool vcpu_dy_runnable(struct kvm_vcpu
*vcpu
)
2572 if (kvm_arch_dy_runnable(vcpu
))
2575 #ifdef CONFIG_KVM_ASYNC_PF
2576 if (!list_empty_careful(&vcpu
->async_pf
.done
))
2583 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
, bool yield_to_kernel_mode
)
2585 struct kvm
*kvm
= me
->kvm
;
2586 struct kvm_vcpu
*vcpu
;
2587 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
2593 kvm_vcpu_set_in_spin_loop(me
, true);
2595 * We boost the priority of a VCPU that is runnable but not
2596 * currently running, because it got preempted by something
2597 * else and called schedule in __vcpu_run. Hopefully that
2598 * VCPU is holding the lock that we need and will release it.
2599 * We approximate round-robin by starting at the last boosted VCPU.
2601 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
2602 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
2603 if (!pass
&& i
<= last_boosted_vcpu
) {
2604 i
= last_boosted_vcpu
;
2606 } else if (pass
&& i
> last_boosted_vcpu
)
2608 if (!READ_ONCE(vcpu
->ready
))
2612 if (swait_active(&vcpu
->wq
) && !vcpu_dy_runnable(vcpu
))
2614 if (READ_ONCE(vcpu
->preempted
) && yield_to_kernel_mode
&&
2615 !kvm_arch_vcpu_in_kernel(vcpu
))
2617 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
2620 yielded
= kvm_vcpu_yield_to(vcpu
);
2622 kvm
->last_boosted_vcpu
= i
;
2624 } else if (yielded
< 0) {
2631 kvm_vcpu_set_in_spin_loop(me
, false);
2633 /* Ensure vcpu is not eligible during next spinloop */
2634 kvm_vcpu_set_dy_eligible(me
, false);
2636 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
2638 static vm_fault_t
kvm_vcpu_fault(struct vm_fault
*vmf
)
2640 struct kvm_vcpu
*vcpu
= vmf
->vma
->vm_file
->private_data
;
2643 if (vmf
->pgoff
== 0)
2644 page
= virt_to_page(vcpu
->run
);
2646 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
2647 page
= virt_to_page(vcpu
->arch
.pio_data
);
2649 #ifdef CONFIG_KVM_MMIO
2650 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
2651 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
2654 return kvm_arch_vcpu_fault(vcpu
, vmf
);
2660 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
2661 .fault
= kvm_vcpu_fault
,
2664 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2666 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
2670 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
2672 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2674 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2675 kvm_put_kvm(vcpu
->kvm
);
2679 static struct file_operations kvm_vcpu_fops
= {
2680 .release
= kvm_vcpu_release
,
2681 .unlocked_ioctl
= kvm_vcpu_ioctl
,
2682 .mmap
= kvm_vcpu_mmap
,
2683 .llseek
= noop_llseek
,
2684 KVM_COMPAT(kvm_vcpu_compat_ioctl
),
2688 * Allocates an inode for the vcpu.
2690 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
2692 char name
[8 + 1 + ITOA_MAX_LEN
+ 1];
2694 snprintf(name
, sizeof(name
), "kvm-vcpu:%d", vcpu
->vcpu_id
);
2695 return anon_inode_getfd(name
, &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
2698 static void kvm_create_vcpu_debugfs(struct kvm_vcpu
*vcpu
)
2700 #ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS
2701 char dir_name
[ITOA_MAX_LEN
* 2];
2703 if (!debugfs_initialized())
2706 snprintf(dir_name
, sizeof(dir_name
), "vcpu%d", vcpu
->vcpu_id
);
2707 vcpu
->debugfs_dentry
= debugfs_create_dir(dir_name
,
2708 vcpu
->kvm
->debugfs_dentry
);
2710 kvm_arch_create_vcpu_debugfs(vcpu
);
2715 * Creates some virtual cpus. Good luck creating more than one.
2717 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
2720 struct kvm_vcpu
*vcpu
;
2722 if (id
>= KVM_MAX_VCPU_ID
)
2725 mutex_lock(&kvm
->lock
);
2726 if (kvm
->created_vcpus
== KVM_MAX_VCPUS
) {
2727 mutex_unlock(&kvm
->lock
);
2731 kvm
->created_vcpus
++;
2732 mutex_unlock(&kvm
->lock
);
2734 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
2737 goto vcpu_decrement
;
2740 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
2742 r
= kvm_arch_vcpu_setup(vcpu
);
2746 kvm_create_vcpu_debugfs(vcpu
);
2748 mutex_lock(&kvm
->lock
);
2749 if (kvm_get_vcpu_by_id(kvm
, id
)) {
2751 goto unlock_vcpu_destroy
;
2754 vcpu
->vcpu_idx
= atomic_read(&kvm
->online_vcpus
);
2755 BUG_ON(kvm
->vcpus
[vcpu
->vcpu_idx
]);
2757 /* Now it's all set up, let userspace reach it */
2759 r
= create_vcpu_fd(vcpu
);
2761 kvm_put_kvm_no_destroy(kvm
);
2762 goto unlock_vcpu_destroy
;
2765 kvm
->vcpus
[vcpu
->vcpu_idx
] = vcpu
;
2768 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2769 * before kvm->online_vcpu's incremented value.
2772 atomic_inc(&kvm
->online_vcpus
);
2774 mutex_unlock(&kvm
->lock
);
2775 kvm_arch_vcpu_postcreate(vcpu
);
2778 unlock_vcpu_destroy
:
2779 mutex_unlock(&kvm
->lock
);
2780 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2782 kvm_arch_vcpu_destroy(vcpu
);
2784 mutex_lock(&kvm
->lock
);
2785 kvm
->created_vcpus
--;
2786 mutex_unlock(&kvm
->lock
);
2790 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
2793 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
2794 vcpu
->sigset_active
= 1;
2795 vcpu
->sigset
= *sigset
;
2797 vcpu
->sigset_active
= 0;
2801 static long kvm_vcpu_ioctl(struct file
*filp
,
2802 unsigned int ioctl
, unsigned long arg
)
2804 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2805 void __user
*argp
= (void __user
*)arg
;
2807 struct kvm_fpu
*fpu
= NULL
;
2808 struct kvm_sregs
*kvm_sregs
= NULL
;
2810 if (vcpu
->kvm
->mm
!= current
->mm
)
2813 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
2817 * Some architectures have vcpu ioctls that are asynchronous to vcpu
2818 * execution; mutex_lock() would break them.
2820 r
= kvm_arch_vcpu_async_ioctl(filp
, ioctl
, arg
);
2821 if (r
!= -ENOIOCTLCMD
)
2824 if (mutex_lock_killable(&vcpu
->mutex
))
2832 oldpid
= rcu_access_pointer(vcpu
->pid
);
2833 if (unlikely(oldpid
!= task_pid(current
))) {
2834 /* The thread running this VCPU changed. */
2837 r
= kvm_arch_vcpu_run_pid_change(vcpu
);
2841 newpid
= get_task_pid(current
, PIDTYPE_PID
);
2842 rcu_assign_pointer(vcpu
->pid
, newpid
);
2847 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
2848 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
2851 case KVM_GET_REGS
: {
2852 struct kvm_regs
*kvm_regs
;
2855 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL_ACCOUNT
);
2858 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2862 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2869 case KVM_SET_REGS
: {
2870 struct kvm_regs
*kvm_regs
;
2873 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2874 if (IS_ERR(kvm_regs
)) {
2875 r
= PTR_ERR(kvm_regs
);
2878 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2882 case KVM_GET_SREGS
: {
2883 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
),
2884 GFP_KERNEL_ACCOUNT
);
2888 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2892 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2897 case KVM_SET_SREGS
: {
2898 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2899 if (IS_ERR(kvm_sregs
)) {
2900 r
= PTR_ERR(kvm_sregs
);
2904 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2907 case KVM_GET_MP_STATE
: {
2908 struct kvm_mp_state mp_state
;
2910 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2914 if (copy_to_user(argp
, &mp_state
, sizeof(mp_state
)))
2919 case KVM_SET_MP_STATE
: {
2920 struct kvm_mp_state mp_state
;
2923 if (copy_from_user(&mp_state
, argp
, sizeof(mp_state
)))
2925 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2928 case KVM_TRANSLATE
: {
2929 struct kvm_translation tr
;
2932 if (copy_from_user(&tr
, argp
, sizeof(tr
)))
2934 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2938 if (copy_to_user(argp
, &tr
, sizeof(tr
)))
2943 case KVM_SET_GUEST_DEBUG
: {
2944 struct kvm_guest_debug dbg
;
2947 if (copy_from_user(&dbg
, argp
, sizeof(dbg
)))
2949 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2952 case KVM_SET_SIGNAL_MASK
: {
2953 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2954 struct kvm_signal_mask kvm_sigmask
;
2955 sigset_t sigset
, *p
;
2960 if (copy_from_user(&kvm_sigmask
, argp
,
2961 sizeof(kvm_sigmask
)))
2964 if (kvm_sigmask
.len
!= sizeof(sigset
))
2967 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2972 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2976 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL_ACCOUNT
);
2980 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2984 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2990 fpu
= memdup_user(argp
, sizeof(*fpu
));
2996 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
3000 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
3003 mutex_unlock(&vcpu
->mutex
);
3009 #ifdef CONFIG_KVM_COMPAT
3010 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
3011 unsigned int ioctl
, unsigned long arg
)
3013 struct kvm_vcpu
*vcpu
= filp
->private_data
;
3014 void __user
*argp
= compat_ptr(arg
);
3017 if (vcpu
->kvm
->mm
!= current
->mm
)
3021 case KVM_SET_SIGNAL_MASK
: {
3022 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
3023 struct kvm_signal_mask kvm_sigmask
;
3028 if (copy_from_user(&kvm_sigmask
, argp
,
3029 sizeof(kvm_sigmask
)))
3032 if (kvm_sigmask
.len
!= sizeof(compat_sigset_t
))
3035 if (get_compat_sigset(&sigset
, (void *)sigmask_arg
->sigset
))
3037 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
3039 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
3043 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
3051 static int kvm_device_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
3053 struct kvm_device
*dev
= filp
->private_data
;
3056 return dev
->ops
->mmap(dev
, vma
);
3061 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
3062 int (*accessor
)(struct kvm_device
*dev
,
3063 struct kvm_device_attr
*attr
),
3066 struct kvm_device_attr attr
;
3071 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
3074 return accessor(dev
, &attr
);
3077 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
3080 struct kvm_device
*dev
= filp
->private_data
;
3082 if (dev
->kvm
->mm
!= current
->mm
)
3086 case KVM_SET_DEVICE_ATTR
:
3087 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
3088 case KVM_GET_DEVICE_ATTR
:
3089 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
3090 case KVM_HAS_DEVICE_ATTR
:
3091 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
3093 if (dev
->ops
->ioctl
)
3094 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
3100 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
3102 struct kvm_device
*dev
= filp
->private_data
;
3103 struct kvm
*kvm
= dev
->kvm
;
3105 if (dev
->ops
->release
) {
3106 mutex_lock(&kvm
->lock
);
3107 list_del(&dev
->vm_node
);
3108 dev
->ops
->release(dev
);
3109 mutex_unlock(&kvm
->lock
);
3116 static const struct file_operations kvm_device_fops
= {
3117 .unlocked_ioctl
= kvm_device_ioctl
,
3118 .release
= kvm_device_release
,
3119 KVM_COMPAT(kvm_device_ioctl
),
3120 .mmap
= kvm_device_mmap
,
3123 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
3125 if (filp
->f_op
!= &kvm_device_fops
)
3128 return filp
->private_data
;
3131 static const struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
3132 #ifdef CONFIG_KVM_MPIC
3133 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
3134 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
3138 int kvm_register_device_ops(const struct kvm_device_ops
*ops
, u32 type
)
3140 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
3143 if (kvm_device_ops_table
[type
] != NULL
)
3146 kvm_device_ops_table
[type
] = ops
;
3150 void kvm_unregister_device_ops(u32 type
)
3152 if (kvm_device_ops_table
[type
] != NULL
)
3153 kvm_device_ops_table
[type
] = NULL
;
3156 static int kvm_ioctl_create_device(struct kvm
*kvm
,
3157 struct kvm_create_device
*cd
)
3159 const struct kvm_device_ops
*ops
= NULL
;
3160 struct kvm_device
*dev
;
3161 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
3165 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
3168 type
= array_index_nospec(cd
->type
, ARRAY_SIZE(kvm_device_ops_table
));
3169 ops
= kvm_device_ops_table
[type
];
3176 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL_ACCOUNT
);
3183 mutex_lock(&kvm
->lock
);
3184 ret
= ops
->create(dev
, type
);
3186 mutex_unlock(&kvm
->lock
);
3190 list_add(&dev
->vm_node
, &kvm
->devices
);
3191 mutex_unlock(&kvm
->lock
);
3197 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
3199 kvm_put_kvm_no_destroy(kvm
);
3200 mutex_lock(&kvm
->lock
);
3201 list_del(&dev
->vm_node
);
3202 mutex_unlock(&kvm
->lock
);
3211 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
3214 case KVM_CAP_USER_MEMORY
:
3215 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
3216 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
3217 case KVM_CAP_INTERNAL_ERROR_DATA
:
3218 #ifdef CONFIG_HAVE_KVM_MSI
3219 case KVM_CAP_SIGNAL_MSI
:
3221 #ifdef CONFIG_HAVE_KVM_IRQFD
3223 case KVM_CAP_IRQFD_RESAMPLE
:
3225 case KVM_CAP_IOEVENTFD_ANY_LENGTH
:
3226 case KVM_CAP_CHECK_EXTENSION_VM
:
3227 case KVM_CAP_ENABLE_CAP_VM
:
3228 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3229 case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2
:
3232 #ifdef CONFIG_KVM_MMIO
3233 case KVM_CAP_COALESCED_MMIO
:
3234 return KVM_COALESCED_MMIO_PAGE_OFFSET
;
3235 case KVM_CAP_COALESCED_PIO
:
3238 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3239 case KVM_CAP_IRQ_ROUTING
:
3240 return KVM_MAX_IRQ_ROUTES
;
3242 #if KVM_ADDRESS_SPACE_NUM > 1
3243 case KVM_CAP_MULTI_ADDRESS_SPACE
:
3244 return KVM_ADDRESS_SPACE_NUM
;
3246 case KVM_CAP_NR_MEMSLOTS
:
3247 return KVM_USER_MEM_SLOTS
;
3251 return kvm_vm_ioctl_check_extension(kvm
, arg
);
3254 int __attribute__((weak
)) kvm_vm_ioctl_enable_cap(struct kvm
*kvm
,
3255 struct kvm_enable_cap
*cap
)
3260 static int kvm_vm_ioctl_enable_cap_generic(struct kvm
*kvm
,
3261 struct kvm_enable_cap
*cap
)
3264 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3265 case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2
:
3266 if (cap
->flags
|| (cap
->args
[0] & ~1))
3268 kvm
->manual_dirty_log_protect
= cap
->args
[0];
3272 return kvm_vm_ioctl_enable_cap(kvm
, cap
);
3276 static long kvm_vm_ioctl(struct file
*filp
,
3277 unsigned int ioctl
, unsigned long arg
)
3279 struct kvm
*kvm
= filp
->private_data
;
3280 void __user
*argp
= (void __user
*)arg
;
3283 if (kvm
->mm
!= current
->mm
)
3286 case KVM_CREATE_VCPU
:
3287 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
3289 case KVM_ENABLE_CAP
: {
3290 struct kvm_enable_cap cap
;
3293 if (copy_from_user(&cap
, argp
, sizeof(cap
)))
3295 r
= kvm_vm_ioctl_enable_cap_generic(kvm
, &cap
);
3298 case KVM_SET_USER_MEMORY_REGION
: {
3299 struct kvm_userspace_memory_region kvm_userspace_mem
;
3302 if (copy_from_user(&kvm_userspace_mem
, argp
,
3303 sizeof(kvm_userspace_mem
)))
3306 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
3309 case KVM_GET_DIRTY_LOG
: {
3310 struct kvm_dirty_log log
;
3313 if (copy_from_user(&log
, argp
, sizeof(log
)))
3315 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
3318 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3319 case KVM_CLEAR_DIRTY_LOG
: {
3320 struct kvm_clear_dirty_log log
;
3323 if (copy_from_user(&log
, argp
, sizeof(log
)))
3325 r
= kvm_vm_ioctl_clear_dirty_log(kvm
, &log
);
3329 #ifdef CONFIG_KVM_MMIO
3330 case KVM_REGISTER_COALESCED_MMIO
: {
3331 struct kvm_coalesced_mmio_zone zone
;
3334 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
3336 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
3339 case KVM_UNREGISTER_COALESCED_MMIO
: {
3340 struct kvm_coalesced_mmio_zone zone
;
3343 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
3345 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
3350 struct kvm_irqfd data
;
3353 if (copy_from_user(&data
, argp
, sizeof(data
)))
3355 r
= kvm_irqfd(kvm
, &data
);
3358 case KVM_IOEVENTFD
: {
3359 struct kvm_ioeventfd data
;
3362 if (copy_from_user(&data
, argp
, sizeof(data
)))
3364 r
= kvm_ioeventfd(kvm
, &data
);
3367 #ifdef CONFIG_HAVE_KVM_MSI
3368 case KVM_SIGNAL_MSI
: {
3372 if (copy_from_user(&msi
, argp
, sizeof(msi
)))
3374 r
= kvm_send_userspace_msi(kvm
, &msi
);
3378 #ifdef __KVM_HAVE_IRQ_LINE
3379 case KVM_IRQ_LINE_STATUS
:
3380 case KVM_IRQ_LINE
: {
3381 struct kvm_irq_level irq_event
;
3384 if (copy_from_user(&irq_event
, argp
, sizeof(irq_event
)))
3387 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
3388 ioctl
== KVM_IRQ_LINE_STATUS
);
3393 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
3394 if (copy_to_user(argp
, &irq_event
, sizeof(irq_event
)))
3402 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3403 case KVM_SET_GSI_ROUTING
: {
3404 struct kvm_irq_routing routing
;
3405 struct kvm_irq_routing __user
*urouting
;
3406 struct kvm_irq_routing_entry
*entries
= NULL
;
3409 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
3412 if (!kvm_arch_can_set_irq_routing(kvm
))
3414 if (routing
.nr
> KVM_MAX_IRQ_ROUTES
)
3420 entries
= vmalloc(array_size(sizeof(*entries
),
3426 if (copy_from_user(entries
, urouting
->entries
,
3427 routing
.nr
* sizeof(*entries
)))
3428 goto out_free_irq_routing
;
3430 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
3432 out_free_irq_routing
:
3436 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
3437 case KVM_CREATE_DEVICE
: {
3438 struct kvm_create_device cd
;
3441 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
3444 r
= kvm_ioctl_create_device(kvm
, &cd
);
3449 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
3455 case KVM_CHECK_EXTENSION
:
3456 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
3459 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
3465 #ifdef CONFIG_KVM_COMPAT
3466 struct compat_kvm_dirty_log
{
3470 compat_uptr_t dirty_bitmap
; /* one bit per page */
3475 static long kvm_vm_compat_ioctl(struct file
*filp
,
3476 unsigned int ioctl
, unsigned long arg
)
3478 struct kvm
*kvm
= filp
->private_data
;
3481 if (kvm
->mm
!= current
->mm
)
3484 case KVM_GET_DIRTY_LOG
: {
3485 struct compat_kvm_dirty_log compat_log
;
3486 struct kvm_dirty_log log
;
3488 if (copy_from_user(&compat_log
, (void __user
*)arg
,
3489 sizeof(compat_log
)))
3491 log
.slot
= compat_log
.slot
;
3492 log
.padding1
= compat_log
.padding1
;
3493 log
.padding2
= compat_log
.padding2
;
3494 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
3496 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
3500 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
3506 static struct file_operations kvm_vm_fops
= {
3507 .release
= kvm_vm_release
,
3508 .unlocked_ioctl
= kvm_vm_ioctl
,
3509 .llseek
= noop_llseek
,
3510 KVM_COMPAT(kvm_vm_compat_ioctl
),
3513 static int kvm_dev_ioctl_create_vm(unsigned long type
)
3519 kvm
= kvm_create_vm(type
);
3521 return PTR_ERR(kvm
);
3522 #ifdef CONFIG_KVM_MMIO
3523 r
= kvm_coalesced_mmio_init(kvm
);
3527 r
= get_unused_fd_flags(O_CLOEXEC
);
3531 file
= anon_inode_getfile("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
3539 * Don't call kvm_put_kvm anymore at this point; file->f_op is
3540 * already set, with ->release() being kvm_vm_release(). In error
3541 * cases it will be called by the final fput(file) and will take
3542 * care of doing kvm_put_kvm(kvm).
3544 if (kvm_create_vm_debugfs(kvm
, r
) < 0) {
3549 kvm_uevent_notify_change(KVM_EVENT_CREATE_VM
, kvm
);
3551 fd_install(r
, file
);
3559 static long kvm_dev_ioctl(struct file
*filp
,
3560 unsigned int ioctl
, unsigned long arg
)
3565 case KVM_GET_API_VERSION
:
3568 r
= KVM_API_VERSION
;
3571 r
= kvm_dev_ioctl_create_vm(arg
);
3573 case KVM_CHECK_EXTENSION
:
3574 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
3576 case KVM_GET_VCPU_MMAP_SIZE
:
3579 r
= PAGE_SIZE
; /* struct kvm_run */
3581 r
+= PAGE_SIZE
; /* pio data page */
3583 #ifdef CONFIG_KVM_MMIO
3584 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
3587 case KVM_TRACE_ENABLE
:
3588 case KVM_TRACE_PAUSE
:
3589 case KVM_TRACE_DISABLE
:
3593 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
3599 static struct file_operations kvm_chardev_ops
= {
3600 .unlocked_ioctl
= kvm_dev_ioctl
,
3601 .llseek
= noop_llseek
,
3602 KVM_COMPAT(kvm_dev_ioctl
),
3605 static struct miscdevice kvm_dev
= {
3611 static void hardware_enable_nolock(void *junk
)
3613 int cpu
= raw_smp_processor_id();
3616 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3619 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
3621 r
= kvm_arch_hardware_enable();
3624 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3625 atomic_inc(&hardware_enable_failed
);
3626 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu
);
3630 static int kvm_starting_cpu(unsigned int cpu
)
3632 raw_spin_lock(&kvm_count_lock
);
3633 if (kvm_usage_count
)
3634 hardware_enable_nolock(NULL
);
3635 raw_spin_unlock(&kvm_count_lock
);
3639 static void hardware_disable_nolock(void *junk
)
3641 int cpu
= raw_smp_processor_id();
3643 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3645 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3646 kvm_arch_hardware_disable();
3649 static int kvm_dying_cpu(unsigned int cpu
)
3651 raw_spin_lock(&kvm_count_lock
);
3652 if (kvm_usage_count
)
3653 hardware_disable_nolock(NULL
);
3654 raw_spin_unlock(&kvm_count_lock
);
3658 static void hardware_disable_all_nolock(void)
3660 BUG_ON(!kvm_usage_count
);
3663 if (!kvm_usage_count
)
3664 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3667 static void hardware_disable_all(void)
3669 raw_spin_lock(&kvm_count_lock
);
3670 hardware_disable_all_nolock();
3671 raw_spin_unlock(&kvm_count_lock
);
3674 static int hardware_enable_all(void)
3678 raw_spin_lock(&kvm_count_lock
);
3681 if (kvm_usage_count
== 1) {
3682 atomic_set(&hardware_enable_failed
, 0);
3683 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
3685 if (atomic_read(&hardware_enable_failed
)) {
3686 hardware_disable_all_nolock();
3691 raw_spin_unlock(&kvm_count_lock
);
3696 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
3700 * Some (well, at least mine) BIOSes hang on reboot if
3703 * And Intel TXT required VMX off for all cpu when system shutdown.
3705 pr_info("kvm: exiting hardware virtualization\n");
3706 kvm_rebooting
= true;
3707 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3711 static struct notifier_block kvm_reboot_notifier
= {
3712 .notifier_call
= kvm_reboot
,
3716 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
3720 for (i
= 0; i
< bus
->dev_count
; i
++) {
3721 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
3723 kvm_iodevice_destructor(pos
);
3728 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
3729 const struct kvm_io_range
*r2
)
3731 gpa_t addr1
= r1
->addr
;
3732 gpa_t addr2
= r2
->addr
;
3737 /* If r2->len == 0, match the exact address. If r2->len != 0,
3738 * accept any overlapping write. Any order is acceptable for
3739 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3740 * we process all of them.
3753 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
3755 return kvm_io_bus_cmp(p1
, p2
);
3758 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
3759 gpa_t addr
, int len
)
3761 struct kvm_io_range
*range
, key
;
3764 key
= (struct kvm_io_range
) {
3769 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
3770 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
3774 off
= range
- bus
->range
;
3776 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
3782 static int __kvm_io_bus_write(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3783 struct kvm_io_range
*range
, const void *val
)
3787 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3791 while (idx
< bus
->dev_count
&&
3792 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3793 if (!kvm_iodevice_write(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3802 /* kvm_io_bus_write - called under kvm->slots_lock */
3803 int kvm_io_bus_write(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3804 int len
, const void *val
)
3806 struct kvm_io_bus
*bus
;
3807 struct kvm_io_range range
;
3810 range
= (struct kvm_io_range
) {
3815 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3818 r
= __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3819 return r
< 0 ? r
: 0;
3821 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
3823 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3824 int kvm_io_bus_write_cookie(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
,
3825 gpa_t addr
, int len
, const void *val
, long cookie
)
3827 struct kvm_io_bus
*bus
;
3828 struct kvm_io_range range
;
3830 range
= (struct kvm_io_range
) {
3835 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3839 /* First try the device referenced by cookie. */
3840 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
3841 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
3842 if (!kvm_iodevice_write(vcpu
, bus
->range
[cookie
].dev
, addr
, len
,
3847 * cookie contained garbage; fall back to search and return the
3848 * correct cookie value.
3850 return __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3853 static int __kvm_io_bus_read(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3854 struct kvm_io_range
*range
, void *val
)
3858 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3862 while (idx
< bus
->dev_count
&&
3863 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3864 if (!kvm_iodevice_read(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3873 /* kvm_io_bus_read - called under kvm->slots_lock */
3874 int kvm_io_bus_read(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3877 struct kvm_io_bus
*bus
;
3878 struct kvm_io_range range
;
3881 range
= (struct kvm_io_range
) {
3886 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3889 r
= __kvm_io_bus_read(vcpu
, bus
, &range
, val
);
3890 return r
< 0 ? r
: 0;
3893 /* Caller must hold slots_lock. */
3894 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
3895 int len
, struct kvm_io_device
*dev
)
3898 struct kvm_io_bus
*new_bus
, *bus
;
3899 struct kvm_io_range range
;
3901 bus
= kvm_get_bus(kvm
, bus_idx
);
3905 /* exclude ioeventfd which is limited by maximum fd */
3906 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
3909 new_bus
= kmalloc(struct_size(bus
, range
, bus
->dev_count
+ 1),
3910 GFP_KERNEL_ACCOUNT
);
3914 range
= (struct kvm_io_range
) {
3920 for (i
= 0; i
< bus
->dev_count
; i
++)
3921 if (kvm_io_bus_cmp(&bus
->range
[i
], &range
) > 0)
3924 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3925 new_bus
->dev_count
++;
3926 new_bus
->range
[i
] = range
;
3927 memcpy(new_bus
->range
+ i
+ 1, bus
->range
+ i
,
3928 (bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3929 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3930 synchronize_srcu_expedited(&kvm
->srcu
);
3936 /* Caller must hold slots_lock. */
3937 void kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3938 struct kvm_io_device
*dev
)
3941 struct kvm_io_bus
*new_bus
, *bus
;
3943 bus
= kvm_get_bus(kvm
, bus_idx
);
3947 for (i
= 0; i
< bus
->dev_count
; i
++)
3948 if (bus
->range
[i
].dev
== dev
) {
3952 if (i
== bus
->dev_count
)
3955 new_bus
= kmalloc(struct_size(bus
, range
, bus
->dev_count
- 1),
3956 GFP_KERNEL_ACCOUNT
);
3958 pr_err("kvm: failed to shrink bus, removing it completely\n");
3962 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3963 new_bus
->dev_count
--;
3964 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3965 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3968 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3969 synchronize_srcu_expedited(&kvm
->srcu
);
3974 struct kvm_io_device
*kvm_io_bus_get_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3977 struct kvm_io_bus
*bus
;
3978 int dev_idx
, srcu_idx
;
3979 struct kvm_io_device
*iodev
= NULL
;
3981 srcu_idx
= srcu_read_lock(&kvm
->srcu
);
3983 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
3987 dev_idx
= kvm_io_bus_get_first_dev(bus
, addr
, 1);
3991 iodev
= bus
->range
[dev_idx
].dev
;
3994 srcu_read_unlock(&kvm
->srcu
, srcu_idx
);
3998 EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev
);
4000 static int kvm_debugfs_open(struct inode
*inode
, struct file
*file
,
4001 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
4004 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)
4007 /* The debugfs files are a reference to the kvm struct which
4008 * is still valid when kvm_destroy_vm is called.
4009 * To avoid the race between open and the removal of the debugfs
4010 * directory we test against the users count.
4012 if (!refcount_inc_not_zero(&stat_data
->kvm
->users_count
))
4015 if (simple_attr_open(inode
, file
, get
,
4016 stat_data
->mode
& S_IWUGO
? set
: NULL
,
4018 kvm_put_kvm(stat_data
->kvm
);
4025 static int kvm_debugfs_release(struct inode
*inode
, struct file
*file
)
4027 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)
4030 simple_attr_release(inode
, file
);
4031 kvm_put_kvm(stat_data
->kvm
);
4036 static int vm_stat_get_per_vm(void *data
, u64
*val
)
4038 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
4040 *val
= *(ulong
*)((void *)stat_data
->kvm
+ stat_data
->offset
);
4045 static int vm_stat_clear_per_vm(void *data
, u64 val
)
4047 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
4052 *(ulong
*)((void *)stat_data
->kvm
+ stat_data
->offset
) = 0;
4057 static int vm_stat_get_per_vm_open(struct inode
*inode
, struct file
*file
)
4059 __simple_attr_check_format("%llu\n", 0ull);
4060 return kvm_debugfs_open(inode
, file
, vm_stat_get_per_vm
,
4061 vm_stat_clear_per_vm
, "%llu\n");
4064 static const struct file_operations vm_stat_get_per_vm_fops
= {
4065 .owner
= THIS_MODULE
,
4066 .open
= vm_stat_get_per_vm_open
,
4067 .release
= kvm_debugfs_release
,
4068 .read
= simple_attr_read
,
4069 .write
= simple_attr_write
,
4070 .llseek
= no_llseek
,
4073 static int vcpu_stat_get_per_vm(void *data
, u64
*val
)
4076 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
4077 struct kvm_vcpu
*vcpu
;
4081 kvm_for_each_vcpu(i
, vcpu
, stat_data
->kvm
)
4082 *val
+= *(u64
*)((void *)vcpu
+ stat_data
->offset
);
4087 static int vcpu_stat_clear_per_vm(void *data
, u64 val
)
4090 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
4091 struct kvm_vcpu
*vcpu
;
4096 kvm_for_each_vcpu(i
, vcpu
, stat_data
->kvm
)
4097 *(u64
*)((void *)vcpu
+ stat_data
->offset
) = 0;
4102 static int vcpu_stat_get_per_vm_open(struct inode
*inode
, struct file
*file
)
4104 __simple_attr_check_format("%llu\n", 0ull);
4105 return kvm_debugfs_open(inode
, file
, vcpu_stat_get_per_vm
,
4106 vcpu_stat_clear_per_vm
, "%llu\n");
4109 static const struct file_operations vcpu_stat_get_per_vm_fops
= {
4110 .owner
= THIS_MODULE
,
4111 .open
= vcpu_stat_get_per_vm_open
,
4112 .release
= kvm_debugfs_release
,
4113 .read
= simple_attr_read
,
4114 .write
= simple_attr_write
,
4115 .llseek
= no_llseek
,
4118 static const struct file_operations
*stat_fops_per_vm
[] = {
4119 [KVM_STAT_VCPU
] = &vcpu_stat_get_per_vm_fops
,
4120 [KVM_STAT_VM
] = &vm_stat_get_per_vm_fops
,
4123 static int vm_stat_get(void *_offset
, u64
*val
)
4125 unsigned offset
= (long)_offset
;
4127 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
4131 mutex_lock(&kvm_lock
);
4132 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4134 vm_stat_get_per_vm((void *)&stat_tmp
, &tmp_val
);
4137 mutex_unlock(&kvm_lock
);
4141 static int vm_stat_clear(void *_offset
, u64 val
)
4143 unsigned offset
= (long)_offset
;
4145 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
4150 mutex_lock(&kvm_lock
);
4151 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4153 vm_stat_clear_per_vm((void *)&stat_tmp
, 0);
4155 mutex_unlock(&kvm_lock
);
4160 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, vm_stat_clear
, "%llu\n");
4162 static int vcpu_stat_get(void *_offset
, u64
*val
)
4164 unsigned offset
= (long)_offset
;
4166 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
4170 mutex_lock(&kvm_lock
);
4171 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4173 vcpu_stat_get_per_vm((void *)&stat_tmp
, &tmp_val
);
4176 mutex_unlock(&kvm_lock
);
4180 static int vcpu_stat_clear(void *_offset
, u64 val
)
4182 unsigned offset
= (long)_offset
;
4184 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
4189 mutex_lock(&kvm_lock
);
4190 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4192 vcpu_stat_clear_per_vm((void *)&stat_tmp
, 0);
4194 mutex_unlock(&kvm_lock
);
4199 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, vcpu_stat_clear
,
4202 static const struct file_operations
*stat_fops
[] = {
4203 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
4204 [KVM_STAT_VM
] = &vm_stat_fops
,
4207 static void kvm_uevent_notify_change(unsigned int type
, struct kvm
*kvm
)
4209 struct kobj_uevent_env
*env
;
4210 unsigned long long created
, active
;
4212 if (!kvm_dev
.this_device
|| !kvm
)
4215 mutex_lock(&kvm_lock
);
4216 if (type
== KVM_EVENT_CREATE_VM
) {
4217 kvm_createvm_count
++;
4219 } else if (type
== KVM_EVENT_DESTROY_VM
) {
4222 created
= kvm_createvm_count
;
4223 active
= kvm_active_vms
;
4224 mutex_unlock(&kvm_lock
);
4226 env
= kzalloc(sizeof(*env
), GFP_KERNEL_ACCOUNT
);
4230 add_uevent_var(env
, "CREATED=%llu", created
);
4231 add_uevent_var(env
, "COUNT=%llu", active
);
4233 if (type
== KVM_EVENT_CREATE_VM
) {
4234 add_uevent_var(env
, "EVENT=create");
4235 kvm
->userspace_pid
= task_pid_nr(current
);
4236 } else if (type
== KVM_EVENT_DESTROY_VM
) {
4237 add_uevent_var(env
, "EVENT=destroy");
4239 add_uevent_var(env
, "PID=%d", kvm
->userspace_pid
);
4241 if (!IS_ERR_OR_NULL(kvm
->debugfs_dentry
)) {
4242 char *tmp
, *p
= kmalloc(PATH_MAX
, GFP_KERNEL_ACCOUNT
);
4245 tmp
= dentry_path_raw(kvm
->debugfs_dentry
, p
, PATH_MAX
);
4247 add_uevent_var(env
, "STATS_PATH=%s", tmp
);
4251 /* no need for checks, since we are adding at most only 5 keys */
4252 env
->envp
[env
->envp_idx
++] = NULL
;
4253 kobject_uevent_env(&kvm_dev
.this_device
->kobj
, KOBJ_CHANGE
, env
->envp
);
4257 static void kvm_init_debug(void)
4259 struct kvm_stats_debugfs_item
*p
;
4261 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
4263 kvm_debugfs_num_entries
= 0;
4264 for (p
= debugfs_entries
; p
->name
; ++p
, kvm_debugfs_num_entries
++) {
4265 int mode
= p
->mode
? p
->mode
: 0644;
4266 debugfs_create_file(p
->name
, mode
, kvm_debugfs_dir
,
4267 (void *)(long)p
->offset
,
4268 stat_fops
[p
->kind
]);
4272 static int kvm_suspend(void)
4274 if (kvm_usage_count
)
4275 hardware_disable_nolock(NULL
);
4279 static void kvm_resume(void)
4281 if (kvm_usage_count
) {
4282 #ifdef CONFIG_LOCKDEP
4283 WARN_ON(lockdep_is_held(&kvm_count_lock
));
4285 hardware_enable_nolock(NULL
);
4289 static struct syscore_ops kvm_syscore_ops
= {
4290 .suspend
= kvm_suspend
,
4291 .resume
= kvm_resume
,
4295 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
4297 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
4300 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
4302 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
4304 WRITE_ONCE(vcpu
->preempted
, false);
4305 WRITE_ONCE(vcpu
->ready
, false);
4307 kvm_arch_sched_in(vcpu
, cpu
);
4309 kvm_arch_vcpu_load(vcpu
, cpu
);
4312 static void kvm_sched_out(struct preempt_notifier
*pn
,
4313 struct task_struct
*next
)
4315 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
4317 if (current
->state
== TASK_RUNNING
) {
4318 WRITE_ONCE(vcpu
->preempted
, true);
4319 WRITE_ONCE(vcpu
->ready
, true);
4321 kvm_arch_vcpu_put(vcpu
);
4324 static void check_processor_compat(void *rtn
)
4326 *(int *)rtn
= kvm_arch_check_processor_compat();
4329 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
4330 struct module
*module
)
4335 r
= kvm_arch_init(opaque
);
4340 * kvm_arch_init makes sure there's at most one caller
4341 * for architectures that support multiple implementations,
4342 * like intel and amd on x86.
4343 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
4344 * conflicts in case kvm is already setup for another implementation.
4346 r
= kvm_irqfd_init();
4350 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
4355 r
= kvm_arch_hardware_setup();
4359 for_each_online_cpu(cpu
) {
4360 smp_call_function_single(cpu
, check_processor_compat
, &r
, 1);
4365 r
= cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING
, "kvm/cpu:starting",
4366 kvm_starting_cpu
, kvm_dying_cpu
);
4369 register_reboot_notifier(&kvm_reboot_notifier
);
4371 /* A kmem cache lets us meet the alignment requirements of fx_save. */
4373 vcpu_align
= __alignof__(struct kvm_vcpu
);
4375 kmem_cache_create_usercopy("kvm_vcpu", vcpu_size
, vcpu_align
,
4377 offsetof(struct kvm_vcpu
, arch
),
4378 sizeof_field(struct kvm_vcpu
, arch
),
4380 if (!kvm_vcpu_cache
) {
4385 r
= kvm_async_pf_init();
4389 kvm_chardev_ops
.owner
= module
;
4390 kvm_vm_fops
.owner
= module
;
4391 kvm_vcpu_fops
.owner
= module
;
4393 r
= misc_register(&kvm_dev
);
4395 pr_err("kvm: misc device register failed\n");
4399 register_syscore_ops(&kvm_syscore_ops
);
4401 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
4402 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
4406 r
= kvm_vfio_ops_init();
4412 kvm_async_pf_deinit();
4414 kmem_cache_destroy(kvm_vcpu_cache
);
4416 unregister_reboot_notifier(&kvm_reboot_notifier
);
4417 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING
);
4419 kvm_arch_hardware_unsetup();
4421 free_cpumask_var(cpus_hardware_enabled
);
4429 EXPORT_SYMBOL_GPL(kvm_init
);
4433 debugfs_remove_recursive(kvm_debugfs_dir
);
4434 misc_deregister(&kvm_dev
);
4435 kmem_cache_destroy(kvm_vcpu_cache
);
4436 kvm_async_pf_deinit();
4437 unregister_syscore_ops(&kvm_syscore_ops
);
4438 unregister_reboot_notifier(&kvm_reboot_notifier
);
4439 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING
);
4440 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
4441 kvm_arch_hardware_unsetup();
4444 free_cpumask_var(cpus_hardware_enabled
);
4445 kvm_vfio_ops_exit();
4447 EXPORT_SYMBOL_GPL(kvm_exit
);
4449 struct kvm_vm_worker_thread_context
{
4451 struct task_struct
*parent
;
4452 struct completion init_done
;
4453 kvm_vm_thread_fn_t thread_fn
;
4458 static int kvm_vm_worker_thread(void *context
)
4461 * The init_context is allocated on the stack of the parent thread, so
4462 * we have to locally copy anything that is needed beyond initialization
4464 struct kvm_vm_worker_thread_context
*init_context
= context
;
4465 struct kvm
*kvm
= init_context
->kvm
;
4466 kvm_vm_thread_fn_t thread_fn
= init_context
->thread_fn
;
4467 uintptr_t data
= init_context
->data
;
4470 err
= kthread_park(current
);
4471 /* kthread_park(current) is never supposed to return an error */
4476 err
= cgroup_attach_task_all(init_context
->parent
, current
);
4478 kvm_err("%s: cgroup_attach_task_all failed with err %d\n",
4483 set_user_nice(current
, task_nice(init_context
->parent
));
4486 init_context
->err
= err
;
4487 complete(&init_context
->init_done
);
4488 init_context
= NULL
;
4493 /* Wait to be woken up by the spawner before proceeding. */
4496 if (!kthread_should_stop())
4497 err
= thread_fn(kvm
, data
);
4502 int kvm_vm_create_worker_thread(struct kvm
*kvm
, kvm_vm_thread_fn_t thread_fn
,
4503 uintptr_t data
, const char *name
,
4504 struct task_struct
**thread_ptr
)
4506 struct kvm_vm_worker_thread_context init_context
= {};
4507 struct task_struct
*thread
;
4510 init_context
.kvm
= kvm
;
4511 init_context
.parent
= current
;
4512 init_context
.thread_fn
= thread_fn
;
4513 init_context
.data
= data
;
4514 init_completion(&init_context
.init_done
);
4516 thread
= kthread_run(kvm_vm_worker_thread
, &init_context
,
4517 "%s-%d", name
, task_pid_nr(current
));
4519 return PTR_ERR(thread
);
4521 /* kthread_run is never supposed to return NULL */
4522 WARN_ON(thread
== NULL
);
4524 wait_for_completion(&init_context
.init_done
);
4526 if (!init_context
.err
)
4527 *thread_ptr
= thread
;
4529 return init_context
.err
;