2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
8 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
19 #include <kvm/iodev.h>
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/percpu.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/syscore_ops.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
44 #include <linux/bitops.h>
45 #include <linux/spinlock.h>
46 #include <linux/compat.h>
47 #include <linux/srcu.h>
48 #include <linux/hugetlb.h>
49 #include <linux/slab.h>
50 #include <linux/sort.h>
51 #include <linux/bsearch.h>
53 #include <asm/processor.h>
55 #include <asm/ioctl.h>
56 #include <asm/uaccess.h>
57 #include <asm/pgtable.h>
59 #include "coalesced_mmio.h"
63 #define CREATE_TRACE_POINTS
64 #include <trace/events/kvm.h>
66 MODULE_AUTHOR("Qumranet");
67 MODULE_LICENSE("GPL");
69 static unsigned int halt_poll_ns
;
70 module_param(halt_poll_ns
, uint
, S_IRUGO
| S_IWUSR
);
75 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
78 DEFINE_SPINLOCK(kvm_lock
);
79 static DEFINE_RAW_SPINLOCK(kvm_count_lock
);
82 static cpumask_var_t cpus_hardware_enabled
;
83 static int kvm_usage_count
;
84 static atomic_t hardware_enable_failed
;
86 struct kmem_cache
*kvm_vcpu_cache
;
87 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
89 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
91 struct dentry
*kvm_debugfs_dir
;
92 EXPORT_SYMBOL_GPL(kvm_debugfs_dir
);
94 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
96 #ifdef CONFIG_KVM_COMPAT
97 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
100 static int hardware_enable_all(void);
101 static void hardware_disable_all(void);
103 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
105 static void kvm_release_pfn_dirty(pfn_t pfn
);
106 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
, gfn_t gfn
);
108 __visible
bool kvm_rebooting
;
109 EXPORT_SYMBOL_GPL(kvm_rebooting
);
111 static bool largepages_enabled
= true;
113 bool kvm_is_reserved_pfn(pfn_t pfn
)
116 return PageReserved(pfn_to_page(pfn
));
122 * Switches to specified vcpu, until a matching vcpu_put()
124 int vcpu_load(struct kvm_vcpu
*vcpu
)
128 if (mutex_lock_killable(&vcpu
->mutex
))
131 preempt_notifier_register(&vcpu
->preempt_notifier
);
132 kvm_arch_vcpu_load(vcpu
, cpu
);
137 void vcpu_put(struct kvm_vcpu
*vcpu
)
140 kvm_arch_vcpu_put(vcpu
);
141 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
143 mutex_unlock(&vcpu
->mutex
);
146 static void ack_flush(void *_completed
)
150 bool kvm_make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
155 struct kvm_vcpu
*vcpu
;
157 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
160 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
161 kvm_make_request(req
, vcpu
);
164 /* Set ->requests bit before we read ->mode */
167 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
168 kvm_vcpu_exiting_guest_mode(vcpu
) != OUTSIDE_GUEST_MODE
)
169 cpumask_set_cpu(cpu
, cpus
);
171 if (unlikely(cpus
== NULL
))
172 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
173 else if (!cpumask_empty(cpus
))
174 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
178 free_cpumask_var(cpus
);
182 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
183 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
185 long dirty_count
= kvm
->tlbs_dirty
;
188 if (kvm_make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
189 ++kvm
->stat
.remote_tlb_flush
;
190 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
192 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs
);
195 void kvm_reload_remote_mmus(struct kvm
*kvm
)
197 kvm_make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
200 void kvm_make_mclock_inprogress_request(struct kvm
*kvm
)
202 kvm_make_all_cpus_request(kvm
, KVM_REQ_MCLOCK_INPROGRESS
);
205 void kvm_make_scan_ioapic_request(struct kvm
*kvm
)
207 kvm_make_all_cpus_request(kvm
, KVM_REQ_SCAN_IOAPIC
);
210 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
215 mutex_init(&vcpu
->mutex
);
220 vcpu
->halt_poll_ns
= 0;
221 init_waitqueue_head(&vcpu
->wq
);
222 kvm_async_pf_vcpu_init(vcpu
);
224 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
229 vcpu
->run
= page_address(page
);
231 kvm_vcpu_set_in_spin_loop(vcpu
, false);
232 kvm_vcpu_set_dy_eligible(vcpu
, false);
233 vcpu
->preempted
= false;
235 r
= kvm_arch_vcpu_init(vcpu
);
241 free_page((unsigned long)vcpu
->run
);
245 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
247 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
250 kvm_arch_vcpu_uninit(vcpu
);
251 free_page((unsigned long)vcpu
->run
);
253 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
255 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
256 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
258 return container_of(mn
, struct kvm
, mmu_notifier
);
261 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
262 struct mm_struct
*mm
,
263 unsigned long address
)
265 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
266 int need_tlb_flush
, idx
;
269 * When ->invalidate_page runs, the linux pte has been zapped
270 * already but the page is still allocated until
271 * ->invalidate_page returns. So if we increase the sequence
272 * here the kvm page fault will notice if the spte can't be
273 * established because the page is going to be freed. If
274 * instead the kvm page fault establishes the spte before
275 * ->invalidate_page runs, kvm_unmap_hva will release it
278 * The sequence increase only need to be seen at spin_unlock
279 * time, and not at spin_lock time.
281 * Increasing the sequence after the spin_unlock would be
282 * unsafe because the kvm page fault could then establish the
283 * pte after kvm_unmap_hva returned, without noticing the page
284 * is going to be freed.
286 idx
= srcu_read_lock(&kvm
->srcu
);
287 spin_lock(&kvm
->mmu_lock
);
289 kvm
->mmu_notifier_seq
++;
290 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
291 /* we've to flush the tlb before the pages can be freed */
293 kvm_flush_remote_tlbs(kvm
);
295 spin_unlock(&kvm
->mmu_lock
);
297 kvm_arch_mmu_notifier_invalidate_page(kvm
, address
);
299 srcu_read_unlock(&kvm
->srcu
, idx
);
302 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
303 struct mm_struct
*mm
,
304 unsigned long address
,
307 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
310 idx
= srcu_read_lock(&kvm
->srcu
);
311 spin_lock(&kvm
->mmu_lock
);
312 kvm
->mmu_notifier_seq
++;
313 kvm_set_spte_hva(kvm
, address
, pte
);
314 spin_unlock(&kvm
->mmu_lock
);
315 srcu_read_unlock(&kvm
->srcu
, idx
);
318 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
319 struct mm_struct
*mm
,
323 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
324 int need_tlb_flush
= 0, idx
;
326 idx
= srcu_read_lock(&kvm
->srcu
);
327 spin_lock(&kvm
->mmu_lock
);
329 * The count increase must become visible at unlock time as no
330 * spte can be established without taking the mmu_lock and
331 * count is also read inside the mmu_lock critical section.
333 kvm
->mmu_notifier_count
++;
334 need_tlb_flush
= kvm_unmap_hva_range(kvm
, start
, end
);
335 need_tlb_flush
|= kvm
->tlbs_dirty
;
336 /* we've to flush the tlb before the pages can be freed */
338 kvm_flush_remote_tlbs(kvm
);
340 spin_unlock(&kvm
->mmu_lock
);
341 srcu_read_unlock(&kvm
->srcu
, idx
);
344 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
345 struct mm_struct
*mm
,
349 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
351 spin_lock(&kvm
->mmu_lock
);
353 * This sequence increase will notify the kvm page fault that
354 * the page that is going to be mapped in the spte could have
357 kvm
->mmu_notifier_seq
++;
360 * The above sequence increase must be visible before the
361 * below count decrease, which is ensured by the smp_wmb above
362 * in conjunction with the smp_rmb in mmu_notifier_retry().
364 kvm
->mmu_notifier_count
--;
365 spin_unlock(&kvm
->mmu_lock
);
367 BUG_ON(kvm
->mmu_notifier_count
< 0);
370 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
371 struct mm_struct
*mm
,
375 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
378 idx
= srcu_read_lock(&kvm
->srcu
);
379 spin_lock(&kvm
->mmu_lock
);
381 young
= kvm_age_hva(kvm
, start
, end
);
383 kvm_flush_remote_tlbs(kvm
);
385 spin_unlock(&kvm
->mmu_lock
);
386 srcu_read_unlock(&kvm
->srcu
, idx
);
391 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
392 struct mm_struct
*mm
,
393 unsigned long address
)
395 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
398 idx
= srcu_read_lock(&kvm
->srcu
);
399 spin_lock(&kvm
->mmu_lock
);
400 young
= kvm_test_age_hva(kvm
, address
);
401 spin_unlock(&kvm
->mmu_lock
);
402 srcu_read_unlock(&kvm
->srcu
, idx
);
407 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
408 struct mm_struct
*mm
)
410 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
413 idx
= srcu_read_lock(&kvm
->srcu
);
414 kvm_arch_flush_shadow_all(kvm
);
415 srcu_read_unlock(&kvm
->srcu
, idx
);
418 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
419 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
420 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
421 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
422 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
423 .test_young
= kvm_mmu_notifier_test_young
,
424 .change_pte
= kvm_mmu_notifier_change_pte
,
425 .release
= kvm_mmu_notifier_release
,
428 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
430 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
431 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
434 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
436 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
441 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
443 static struct kvm_memslots
*kvm_alloc_memslots(void)
446 struct kvm_memslots
*slots
;
448 slots
= kvm_kvzalloc(sizeof(struct kvm_memslots
));
453 * Init kvm generation close to the maximum to easily test the
454 * code of handling generation number wrap-around.
456 slots
->generation
= -150;
457 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
458 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
463 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
465 if (!memslot
->dirty_bitmap
)
468 kvfree(memslot
->dirty_bitmap
);
469 memslot
->dirty_bitmap
= NULL
;
473 * Free any memory in @free but not in @dont.
475 static void kvm_free_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
476 struct kvm_memory_slot
*dont
)
478 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
479 kvm_destroy_dirty_bitmap(free
);
481 kvm_arch_free_memslot(kvm
, free
, dont
);
486 static void kvm_free_memslots(struct kvm
*kvm
, struct kvm_memslots
*slots
)
488 struct kvm_memory_slot
*memslot
;
493 kvm_for_each_memslot(memslot
, slots
)
494 kvm_free_memslot(kvm
, memslot
, NULL
);
499 static struct kvm
*kvm_create_vm(unsigned long type
)
502 struct kvm
*kvm
= kvm_arch_alloc_vm();
505 return ERR_PTR(-ENOMEM
);
507 r
= kvm_arch_init_vm(kvm
, type
);
509 goto out_err_no_disable
;
511 r
= hardware_enable_all();
513 goto out_err_no_disable
;
515 #ifdef CONFIG_HAVE_KVM_IRQFD
516 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
519 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
522 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++) {
523 kvm
->memslots
[i
] = kvm_alloc_memslots();
524 if (!kvm
->memslots
[i
])
525 goto out_err_no_srcu
;
528 if (init_srcu_struct(&kvm
->srcu
))
529 goto out_err_no_srcu
;
530 if (init_srcu_struct(&kvm
->irq_srcu
))
531 goto out_err_no_irq_srcu
;
532 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
533 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
539 spin_lock_init(&kvm
->mmu_lock
);
540 kvm
->mm
= current
->mm
;
541 atomic_inc(&kvm
->mm
->mm_count
);
542 kvm_eventfd_init(kvm
);
543 mutex_init(&kvm
->lock
);
544 mutex_init(&kvm
->irq_lock
);
545 mutex_init(&kvm
->slots_lock
);
546 atomic_set(&kvm
->users_count
, 1);
547 INIT_LIST_HEAD(&kvm
->devices
);
549 r
= kvm_init_mmu_notifier(kvm
);
553 spin_lock(&kvm_lock
);
554 list_add(&kvm
->vm_list
, &vm_list
);
555 spin_unlock(&kvm_lock
);
557 preempt_notifier_inc();
562 cleanup_srcu_struct(&kvm
->irq_srcu
);
564 cleanup_srcu_struct(&kvm
->srcu
);
566 hardware_disable_all();
568 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
569 kfree(kvm
->buses
[i
]);
570 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
571 kvm_free_memslots(kvm
, kvm
->memslots
[i
]);
572 kvm_arch_free_vm(kvm
);
577 * Avoid using vmalloc for a small buffer.
578 * Should not be used when the size is statically known.
580 void *kvm_kvzalloc(unsigned long size
)
582 if (size
> PAGE_SIZE
)
583 return vzalloc(size
);
585 return kzalloc(size
, GFP_KERNEL
);
588 static void kvm_destroy_devices(struct kvm
*kvm
)
590 struct list_head
*node
, *tmp
;
592 list_for_each_safe(node
, tmp
, &kvm
->devices
) {
593 struct kvm_device
*dev
=
594 list_entry(node
, struct kvm_device
, vm_node
);
597 dev
->ops
->destroy(dev
);
601 static void kvm_destroy_vm(struct kvm
*kvm
)
604 struct mm_struct
*mm
= kvm
->mm
;
606 kvm_arch_sync_events(kvm
);
607 spin_lock(&kvm_lock
);
608 list_del(&kvm
->vm_list
);
609 spin_unlock(&kvm_lock
);
610 kvm_free_irq_routing(kvm
);
611 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
612 kvm_io_bus_destroy(kvm
->buses
[i
]);
613 kvm_coalesced_mmio_free(kvm
);
614 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
615 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
617 kvm_arch_flush_shadow_all(kvm
);
619 kvm_arch_destroy_vm(kvm
);
620 kvm_destroy_devices(kvm
);
621 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
622 kvm_free_memslots(kvm
, kvm
->memslots
[i
]);
623 cleanup_srcu_struct(&kvm
->irq_srcu
);
624 cleanup_srcu_struct(&kvm
->srcu
);
625 kvm_arch_free_vm(kvm
);
626 preempt_notifier_dec();
627 hardware_disable_all();
631 void kvm_get_kvm(struct kvm
*kvm
)
633 atomic_inc(&kvm
->users_count
);
635 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
637 void kvm_put_kvm(struct kvm
*kvm
)
639 if (atomic_dec_and_test(&kvm
->users_count
))
642 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
645 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
647 struct kvm
*kvm
= filp
->private_data
;
649 kvm_irqfd_release(kvm
);
656 * Allocation size is twice as large as the actual dirty bitmap size.
657 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
659 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
661 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
663 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
664 if (!memslot
->dirty_bitmap
)
671 * Insert memslot and re-sort memslots based on their GFN,
672 * so binary search could be used to lookup GFN.
673 * Sorting algorithm takes advantage of having initially
674 * sorted array and known changed memslot position.
676 static void update_memslots(struct kvm_memslots
*slots
,
677 struct kvm_memory_slot
*new)
680 int i
= slots
->id_to_index
[id
];
681 struct kvm_memory_slot
*mslots
= slots
->memslots
;
683 WARN_ON(mslots
[i
].id
!= id
);
685 WARN_ON(!mslots
[i
].npages
);
686 if (mslots
[i
].npages
)
689 if (!mslots
[i
].npages
)
693 while (i
< KVM_MEM_SLOTS_NUM
- 1 &&
694 new->base_gfn
<= mslots
[i
+ 1].base_gfn
) {
695 if (!mslots
[i
+ 1].npages
)
697 mslots
[i
] = mslots
[i
+ 1];
698 slots
->id_to_index
[mslots
[i
].id
] = i
;
703 * The ">=" is needed when creating a slot with base_gfn == 0,
704 * so that it moves before all those with base_gfn == npages == 0.
706 * On the other hand, if new->npages is zero, the above loop has
707 * already left i pointing to the beginning of the empty part of
708 * mslots, and the ">=" would move the hole backwards in this
709 * case---which is wrong. So skip the loop when deleting a slot.
713 new->base_gfn
>= mslots
[i
- 1].base_gfn
) {
714 mslots
[i
] = mslots
[i
- 1];
715 slots
->id_to_index
[mslots
[i
].id
] = i
;
719 WARN_ON_ONCE(i
!= slots
->used_slots
);
722 slots
->id_to_index
[mslots
[i
].id
] = i
;
725 static int check_memory_region_flags(const struct kvm_userspace_memory_region
*mem
)
727 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
729 #ifdef __KVM_HAVE_READONLY_MEM
730 valid_flags
|= KVM_MEM_READONLY
;
733 if (mem
->flags
& ~valid_flags
)
739 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
740 int as_id
, struct kvm_memslots
*slots
)
742 struct kvm_memslots
*old_memslots
= __kvm_memslots(kvm
, as_id
);
745 * Set the low bit in the generation, which disables SPTE caching
746 * until the end of synchronize_srcu_expedited.
748 WARN_ON(old_memslots
->generation
& 1);
749 slots
->generation
= old_memslots
->generation
+ 1;
751 rcu_assign_pointer(kvm
->memslots
[as_id
], slots
);
752 synchronize_srcu_expedited(&kvm
->srcu
);
755 * Increment the new memslot generation a second time. This prevents
756 * vm exits that race with memslot updates from caching a memslot
757 * generation that will (potentially) be valid forever.
761 kvm_arch_memslots_updated(kvm
, slots
);
767 * Allocate some memory and give it an address in the guest physical address
770 * Discontiguous memory is allowed, mostly for framebuffers.
772 * Must be called holding kvm->slots_lock for write.
774 int __kvm_set_memory_region(struct kvm
*kvm
,
775 const struct kvm_userspace_memory_region
*mem
)
779 unsigned long npages
;
780 struct kvm_memory_slot
*slot
;
781 struct kvm_memory_slot old
, new;
782 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
784 enum kvm_mr_change change
;
786 r
= check_memory_region_flags(mem
);
791 as_id
= mem
->slot
>> 16;
794 /* General sanity checks */
795 if (mem
->memory_size
& (PAGE_SIZE
- 1))
797 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
799 /* We can read the guest memory with __xxx_user() later on. */
800 if ((id
< KVM_USER_MEM_SLOTS
) &&
801 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
802 !access_ok(VERIFY_WRITE
,
803 (void __user
*)(unsigned long)mem
->userspace_addr
,
806 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_MEM_SLOTS_NUM
)
808 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
811 slot
= id_to_memslot(__kvm_memslots(kvm
, as_id
), id
);
812 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
813 npages
= mem
->memory_size
>> PAGE_SHIFT
;
815 if (npages
> KVM_MEM_MAX_NR_PAGES
)
821 new.base_gfn
= base_gfn
;
823 new.flags
= mem
->flags
;
827 change
= KVM_MR_CREATE
;
828 else { /* Modify an existing slot. */
829 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
830 (npages
!= old
.npages
) ||
831 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
834 if (base_gfn
!= old
.base_gfn
)
835 change
= KVM_MR_MOVE
;
836 else if (new.flags
!= old
.flags
)
837 change
= KVM_MR_FLAGS_ONLY
;
838 else { /* Nothing to change. */
847 change
= KVM_MR_DELETE
;
852 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
853 /* Check for overlaps */
855 kvm_for_each_memslot(slot
, __kvm_memslots(kvm
, as_id
)) {
856 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
859 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
860 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
865 /* Free page dirty bitmap if unneeded */
866 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
867 new.dirty_bitmap
= NULL
;
870 if (change
== KVM_MR_CREATE
) {
871 new.userspace_addr
= mem
->userspace_addr
;
873 if (kvm_arch_create_memslot(kvm
, &new, npages
))
877 /* Allocate page dirty bitmap if needed */
878 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
879 if (kvm_create_dirty_bitmap(&new) < 0)
883 slots
= kvm_kvzalloc(sizeof(struct kvm_memslots
));
886 memcpy(slots
, __kvm_memslots(kvm
, as_id
), sizeof(struct kvm_memslots
));
888 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
889 slot
= id_to_memslot(slots
, id
);
890 slot
->flags
|= KVM_MEMSLOT_INVALID
;
892 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
894 /* slot was deleted or moved, clear iommu mapping */
895 kvm_iommu_unmap_pages(kvm
, &old
);
896 /* From this point no new shadow pages pointing to a deleted,
897 * or moved, memslot will be created.
899 * validation of sp->gfn happens in:
900 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
901 * - kvm_is_visible_gfn (mmu_check_roots)
903 kvm_arch_flush_shadow_memslot(kvm
, slot
);
906 * We can re-use the old_memslots from above, the only difference
907 * from the currently installed memslots is the invalid flag. This
908 * will get overwritten by update_memslots anyway.
910 slots
= old_memslots
;
913 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
917 /* actual memory is freed via old in kvm_free_memslot below */
918 if (change
== KVM_MR_DELETE
) {
919 new.dirty_bitmap
= NULL
;
920 memset(&new.arch
, 0, sizeof(new.arch
));
923 update_memslots(slots
, &new);
924 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
926 kvm_arch_commit_memory_region(kvm
, mem
, &old
, &new, change
);
928 kvm_free_memslot(kvm
, &old
, &new);
929 kvfree(old_memslots
);
932 * IOMMU mapping: New slots need to be mapped. Old slots need to be
933 * un-mapped and re-mapped if their base changes. Since base change
934 * unmapping is handled above with slot deletion, mapping alone is
935 * needed here. Anything else the iommu might care about for existing
936 * slots (size changes, userspace addr changes and read-only flag
937 * changes) is disallowed above, so any other attribute changes getting
938 * here can be skipped.
940 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
941 r
= kvm_iommu_map_pages(kvm
, &new);
950 kvm_free_memslot(kvm
, &new, &old
);
954 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
956 int kvm_set_memory_region(struct kvm
*kvm
,
957 const struct kvm_userspace_memory_region
*mem
)
961 mutex_lock(&kvm
->slots_lock
);
962 r
= __kvm_set_memory_region(kvm
, mem
);
963 mutex_unlock(&kvm
->slots_lock
);
966 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
968 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
969 struct kvm_userspace_memory_region
*mem
)
971 if ((u16
)mem
->slot
>= KVM_USER_MEM_SLOTS
)
974 return kvm_set_memory_region(kvm
, mem
);
977 int kvm_get_dirty_log(struct kvm
*kvm
,
978 struct kvm_dirty_log
*log
, int *is_dirty
)
980 struct kvm_memslots
*slots
;
981 struct kvm_memory_slot
*memslot
;
984 unsigned long any
= 0;
987 as_id
= log
->slot
>> 16;
989 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
992 slots
= __kvm_memslots(kvm
, as_id
);
993 memslot
= id_to_memslot(slots
, id
);
995 if (!memslot
->dirty_bitmap
)
998 n
= kvm_dirty_bitmap_bytes(memslot
);
1000 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
1001 any
= memslot
->dirty_bitmap
[i
];
1004 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
1014 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
1016 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1018 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1019 * are dirty write protect them for next write.
1020 * @kvm: pointer to kvm instance
1021 * @log: slot id and address to which we copy the log
1022 * @is_dirty: flag set if any page is dirty
1024 * We need to keep it in mind that VCPU threads can write to the bitmap
1025 * concurrently. So, to avoid losing track of dirty pages we keep the
1028 * 1. Take a snapshot of the bit and clear it if needed.
1029 * 2. Write protect the corresponding page.
1030 * 3. Copy the snapshot to the userspace.
1031 * 4. Upon return caller flushes TLB's if needed.
1033 * Between 2 and 4, the guest may write to the page using the remaining TLB
1034 * entry. This is not a problem because the page is reported dirty using
1035 * the snapshot taken before and step 4 ensures that writes done after
1036 * exiting to userspace will be logged for the next call.
1039 int kvm_get_dirty_log_protect(struct kvm
*kvm
,
1040 struct kvm_dirty_log
*log
, bool *is_dirty
)
1042 struct kvm_memslots
*slots
;
1043 struct kvm_memory_slot
*memslot
;
1044 int r
, i
, as_id
, id
;
1046 unsigned long *dirty_bitmap
;
1047 unsigned long *dirty_bitmap_buffer
;
1050 as_id
= log
->slot
>> 16;
1051 id
= (u16
)log
->slot
;
1052 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1055 slots
= __kvm_memslots(kvm
, as_id
);
1056 memslot
= id_to_memslot(slots
, id
);
1058 dirty_bitmap
= memslot
->dirty_bitmap
;
1063 n
= kvm_dirty_bitmap_bytes(memslot
);
1065 dirty_bitmap_buffer
= dirty_bitmap
+ n
/ sizeof(long);
1066 memset(dirty_bitmap_buffer
, 0, n
);
1068 spin_lock(&kvm
->mmu_lock
);
1070 for (i
= 0; i
< n
/ sizeof(long); i
++) {
1074 if (!dirty_bitmap
[i
])
1079 mask
= xchg(&dirty_bitmap
[i
], 0);
1080 dirty_bitmap_buffer
[i
] = mask
;
1083 offset
= i
* BITS_PER_LONG
;
1084 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
,
1089 spin_unlock(&kvm
->mmu_lock
);
1092 if (copy_to_user(log
->dirty_bitmap
, dirty_bitmap_buffer
, n
))
1099 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect
);
1102 bool kvm_largepages_enabled(void)
1104 return largepages_enabled
;
1107 void kvm_disable_largepages(void)
1109 largepages_enabled
= false;
1111 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
1113 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1115 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1117 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1119 struct kvm_memory_slot
*kvm_vcpu_gfn_to_memslot(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1121 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu
), gfn
);
1124 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1126 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1128 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1129 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1134 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1136 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1138 struct vm_area_struct
*vma
;
1139 unsigned long addr
, size
;
1143 addr
= gfn_to_hva(kvm
, gfn
);
1144 if (kvm_is_error_hva(addr
))
1147 down_read(¤t
->mm
->mmap_sem
);
1148 vma
= find_vma(current
->mm
, addr
);
1152 size
= vma_kernel_pagesize(vma
);
1155 up_read(¤t
->mm
->mmap_sem
);
1160 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1162 return slot
->flags
& KVM_MEM_READONLY
;
1165 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1166 gfn_t
*nr_pages
, bool write
)
1168 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1169 return KVM_HVA_ERR_BAD
;
1171 if (memslot_is_readonly(slot
) && write
)
1172 return KVM_HVA_ERR_RO_BAD
;
1175 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1177 return __gfn_to_hva_memslot(slot
, gfn
);
1180 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1183 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1186 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1189 return gfn_to_hva_many(slot
, gfn
, NULL
);
1191 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1193 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1195 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1197 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1199 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1201 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
, NULL
);
1203 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva
);
1206 * If writable is set to false, the hva returned by this function is only
1207 * allowed to be read.
1209 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot
*slot
,
1210 gfn_t gfn
, bool *writable
)
1212 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1214 if (!kvm_is_error_hva(hva
) && writable
)
1215 *writable
= !memslot_is_readonly(slot
);
1220 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1222 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1224 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1227 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu
*vcpu
, gfn_t gfn
, bool *writable
)
1229 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1231 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1234 static int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1235 unsigned long start
, int write
, struct page
**page
)
1237 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1240 flags
|= FOLL_WRITE
;
1242 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1245 static inline int check_user_page_hwpoison(unsigned long addr
)
1247 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1249 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1250 flags
, NULL
, NULL
, NULL
);
1251 return rc
== -EHWPOISON
;
1255 * The atomic path to get the writable pfn which will be stored in @pfn,
1256 * true indicates success, otherwise false is returned.
1258 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1259 bool write_fault
, bool *writable
, pfn_t
*pfn
)
1261 struct page
*page
[1];
1264 if (!(async
|| atomic
))
1268 * Fast pin a writable pfn only if it is a write fault request
1269 * or the caller allows to map a writable pfn for a read fault
1272 if (!(write_fault
|| writable
))
1275 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1277 *pfn
= page_to_pfn(page
[0]);
1288 * The slow path to get the pfn of the specified host virtual address,
1289 * 1 indicates success, -errno is returned if error is detected.
1291 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1292 bool *writable
, pfn_t
*pfn
)
1294 struct page
*page
[1];
1300 *writable
= write_fault
;
1303 down_read(¤t
->mm
->mmap_sem
);
1304 npages
= get_user_page_nowait(current
, current
->mm
,
1305 addr
, write_fault
, page
);
1306 up_read(¤t
->mm
->mmap_sem
);
1308 npages
= __get_user_pages_unlocked(current
, current
->mm
, addr
, 1,
1309 write_fault
, 0, page
,
1310 FOLL_TOUCH
|FOLL_HWPOISON
);
1314 /* map read fault as writable if possible */
1315 if (unlikely(!write_fault
) && writable
) {
1316 struct page
*wpage
[1];
1318 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1327 *pfn
= page_to_pfn(page
[0]);
1331 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1333 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1336 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1343 * Pin guest page in memory and return its pfn.
1344 * @addr: host virtual address which maps memory to the guest
1345 * @atomic: whether this function can sleep
1346 * @async: whether this function need to wait IO complete if the
1347 * host page is not in the memory
1348 * @write_fault: whether we should get a writable host page
1349 * @writable: whether it allows to map a writable host page for !@write_fault
1351 * The function will map a writable host page for these two cases:
1352 * 1): @write_fault = true
1353 * 2): @write_fault = false && @writable, @writable will tell the caller
1354 * whether the mapping is writable.
1356 static pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1357 bool write_fault
, bool *writable
)
1359 struct vm_area_struct
*vma
;
1363 /* we can do it either atomically or asynchronously, not both */
1364 BUG_ON(atomic
&& async
);
1366 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1370 return KVM_PFN_ERR_FAULT
;
1372 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1376 down_read(¤t
->mm
->mmap_sem
);
1377 if (npages
== -EHWPOISON
||
1378 (!async
&& check_user_page_hwpoison(addr
))) {
1379 pfn
= KVM_PFN_ERR_HWPOISON
;
1383 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1386 pfn
= KVM_PFN_ERR_FAULT
;
1387 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1388 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1390 BUG_ON(!kvm_is_reserved_pfn(pfn
));
1392 if (async
&& vma_is_valid(vma
, write_fault
))
1394 pfn
= KVM_PFN_ERR_FAULT
;
1397 up_read(¤t
->mm
->mmap_sem
);
1401 pfn_t
__gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
, bool atomic
,
1402 bool *async
, bool write_fault
, bool *writable
)
1404 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1406 if (addr
== KVM_HVA_ERR_RO_BAD
)
1407 return KVM_PFN_ERR_RO_FAULT
;
1409 if (kvm_is_error_hva(addr
))
1410 return KVM_PFN_NOSLOT
;
1412 /* Do not map writable pfn in the readonly memslot. */
1413 if (writable
&& memslot_is_readonly(slot
)) {
1418 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1421 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot
);
1423 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1426 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
, false, NULL
,
1427 write_fault
, writable
);
1429 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1431 pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1433 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1435 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot
);
1437 pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1439 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1441 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1443 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1445 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm
, gfn
), gfn
);
1447 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1449 pfn_t
kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1451 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1453 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic
);
1455 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1457 return gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
);
1459 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1461 pfn_t
kvm_vcpu_gfn_to_pfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1463 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1465 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn
);
1467 int gfn_to_page_many_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1468 struct page
**pages
, int nr_pages
)
1473 addr
= gfn_to_hva_many(slot
, gfn
, &entry
);
1474 if (kvm_is_error_hva(addr
))
1477 if (entry
< nr_pages
)
1480 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1482 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1484 static struct page
*kvm_pfn_to_page(pfn_t pfn
)
1486 if (is_error_noslot_pfn(pfn
))
1487 return KVM_ERR_PTR_BAD_PAGE
;
1489 if (kvm_is_reserved_pfn(pfn
)) {
1491 return KVM_ERR_PTR_BAD_PAGE
;
1494 return pfn_to_page(pfn
);
1497 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1501 pfn
= gfn_to_pfn(kvm
, gfn
);
1503 return kvm_pfn_to_page(pfn
);
1505 EXPORT_SYMBOL_GPL(gfn_to_page
);
1507 struct page
*kvm_vcpu_gfn_to_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1511 pfn
= kvm_vcpu_gfn_to_pfn(vcpu
, gfn
);
1513 return kvm_pfn_to_page(pfn
);
1515 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page
);
1517 void kvm_release_page_clean(struct page
*page
)
1519 WARN_ON(is_error_page(page
));
1521 kvm_release_pfn_clean(page_to_pfn(page
));
1523 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1525 void kvm_release_pfn_clean(pfn_t pfn
)
1527 if (!is_error_noslot_pfn(pfn
) && !kvm_is_reserved_pfn(pfn
))
1528 put_page(pfn_to_page(pfn
));
1530 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1532 void kvm_release_page_dirty(struct page
*page
)
1534 WARN_ON(is_error_page(page
));
1536 kvm_release_pfn_dirty(page_to_pfn(page
));
1538 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1540 static void kvm_release_pfn_dirty(pfn_t pfn
)
1542 kvm_set_pfn_dirty(pfn
);
1543 kvm_release_pfn_clean(pfn
);
1546 void kvm_set_pfn_dirty(pfn_t pfn
)
1548 if (!kvm_is_reserved_pfn(pfn
)) {
1549 struct page
*page
= pfn_to_page(pfn
);
1551 if (!PageReserved(page
))
1555 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1557 void kvm_set_pfn_accessed(pfn_t pfn
)
1559 if (!kvm_is_reserved_pfn(pfn
))
1560 mark_page_accessed(pfn_to_page(pfn
));
1562 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1564 void kvm_get_pfn(pfn_t pfn
)
1566 if (!kvm_is_reserved_pfn(pfn
))
1567 get_page(pfn_to_page(pfn
));
1569 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1571 static int next_segment(unsigned long len
, int offset
)
1573 if (len
> PAGE_SIZE
- offset
)
1574 return PAGE_SIZE
- offset
;
1579 static int __kvm_read_guest_page(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1580 void *data
, int offset
, int len
)
1585 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1586 if (kvm_is_error_hva(addr
))
1588 r
= __copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1594 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1597 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1599 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1601 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1603 int kvm_vcpu_read_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
, void *data
,
1604 int offset
, int len
)
1606 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1608 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1610 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page
);
1612 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1614 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1616 int offset
= offset_in_page(gpa
);
1619 while ((seg
= next_segment(len
, offset
)) != 0) {
1620 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1630 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1632 int kvm_vcpu_read_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, void *data
, unsigned long len
)
1634 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1636 int offset
= offset_in_page(gpa
);
1639 while ((seg
= next_segment(len
, offset
)) != 0) {
1640 ret
= kvm_vcpu_read_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1650 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest
);
1652 static int __kvm_read_guest_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1653 void *data
, int offset
, unsigned long len
)
1658 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1659 if (kvm_is_error_hva(addr
))
1661 pagefault_disable();
1662 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1669 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1672 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1673 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1674 int offset
= offset_in_page(gpa
);
1676 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1678 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic
);
1680 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
1681 void *data
, unsigned long len
)
1683 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1684 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1685 int offset
= offset_in_page(gpa
);
1687 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1689 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic
);
1691 static int __kvm_write_guest_page(struct kvm_memory_slot
*memslot
, gfn_t gfn
,
1692 const void *data
, int offset
, int len
)
1697 addr
= gfn_to_hva_memslot(memslot
, gfn
);
1698 if (kvm_is_error_hva(addr
))
1700 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1703 mark_page_dirty_in_slot(memslot
, gfn
);
1707 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
,
1708 const void *data
, int offset
, int len
)
1710 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1712 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
1714 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1716 int kvm_vcpu_write_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
,
1717 const void *data
, int offset
, int len
)
1719 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1721 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
1723 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page
);
1725 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1728 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1730 int offset
= offset_in_page(gpa
);
1733 while ((seg
= next_segment(len
, offset
)) != 0) {
1734 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1744 EXPORT_SYMBOL_GPL(kvm_write_guest
);
1746 int kvm_vcpu_write_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, const void *data
,
1749 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1751 int offset
= offset_in_page(gpa
);
1754 while ((seg
= next_segment(len
, offset
)) != 0) {
1755 ret
= kvm_vcpu_write_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1765 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest
);
1767 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1768 gpa_t gpa
, unsigned long len
)
1770 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1771 int offset
= offset_in_page(gpa
);
1772 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
1773 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
1774 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
1775 gfn_t nr_pages_avail
;
1778 ghc
->generation
= slots
->generation
;
1780 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1781 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
, NULL
);
1782 if (!kvm_is_error_hva(ghc
->hva
) && nr_pages_needed
<= 1) {
1786 * If the requested region crosses two memslots, we still
1787 * verify that the entire region is valid here.
1789 while (start_gfn
<= end_gfn
) {
1790 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1791 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
1793 if (kvm_is_error_hva(ghc
->hva
))
1795 start_gfn
+= nr_pages_avail
;
1797 /* Use the slow path for cross page reads and writes. */
1798 ghc
->memslot
= NULL
;
1802 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1804 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1805 void *data
, unsigned long len
)
1807 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1810 BUG_ON(len
> ghc
->len
);
1812 if (slots
->generation
!= ghc
->generation
)
1813 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1815 if (unlikely(!ghc
->memslot
))
1816 return kvm_write_guest(kvm
, ghc
->gpa
, data
, len
);
1818 if (kvm_is_error_hva(ghc
->hva
))
1821 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1824 mark_page_dirty_in_slot(ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1828 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1830 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1831 void *data
, unsigned long len
)
1833 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1836 BUG_ON(len
> ghc
->len
);
1838 if (slots
->generation
!= ghc
->generation
)
1839 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1841 if (unlikely(!ghc
->memslot
))
1842 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
1844 if (kvm_is_error_hva(ghc
->hva
))
1847 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1853 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1855 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1857 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
1859 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
1861 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1863 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1865 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1867 int offset
= offset_in_page(gpa
);
1870 while ((seg
= next_segment(len
, offset
)) != 0) {
1871 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1880 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1882 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
,
1885 if (memslot
&& memslot
->dirty_bitmap
) {
1886 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1888 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1892 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1894 struct kvm_memory_slot
*memslot
;
1896 memslot
= gfn_to_memslot(kvm
, gfn
);
1897 mark_page_dirty_in_slot(memslot
, gfn
);
1899 EXPORT_SYMBOL_GPL(mark_page_dirty
);
1901 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1903 struct kvm_memory_slot
*memslot
;
1905 memslot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1906 mark_page_dirty_in_slot(memslot
, gfn
);
1908 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty
);
1910 static int kvm_vcpu_check_block(struct kvm_vcpu
*vcpu
)
1912 if (kvm_arch_vcpu_runnable(vcpu
)) {
1913 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1916 if (kvm_cpu_has_pending_timer(vcpu
))
1918 if (signal_pending(current
))
1925 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1927 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1931 bool waited
= false;
1933 start
= cur
= ktime_get();
1934 if (vcpu
->halt_poll_ns
) {
1935 ktime_t stop
= ktime_add_ns(ktime_get(), vcpu
->halt_poll_ns
);
1939 * This sets KVM_REQ_UNHALT if an interrupt
1942 if (kvm_vcpu_check_block(vcpu
) < 0) {
1943 ++vcpu
->stat
.halt_successful_poll
;
1947 } while (single_task_running() && ktime_before(cur
, stop
));
1951 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1953 if (kvm_vcpu_check_block(vcpu
) < 0)
1960 finish_wait(&vcpu
->wq
, &wait
);
1964 trace_kvm_vcpu_wakeup(ktime_to_ns(cur
) - ktime_to_ns(start
), waited
);
1966 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
1970 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1972 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
1975 int cpu
= vcpu
->cpu
;
1976 wait_queue_head_t
*wqp
;
1978 wqp
= kvm_arch_vcpu_wq(vcpu
);
1979 if (waitqueue_active(wqp
)) {
1980 wake_up_interruptible(wqp
);
1981 ++vcpu
->stat
.halt_wakeup
;
1985 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
1986 if (kvm_arch_vcpu_should_kick(vcpu
))
1987 smp_send_reschedule(cpu
);
1990 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
1991 #endif /* !CONFIG_S390 */
1993 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
1996 struct task_struct
*task
= NULL
;
2000 pid
= rcu_dereference(target
->pid
);
2002 task
= get_pid_task(pid
, PIDTYPE_PID
);
2006 ret
= yield_to(task
, 1);
2007 put_task_struct(task
);
2011 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
2014 * Helper that checks whether a VCPU is eligible for directed yield.
2015 * Most eligible candidate to yield is decided by following heuristics:
2017 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2018 * (preempted lock holder), indicated by @in_spin_loop.
2019 * Set at the beiginning and cleared at the end of interception/PLE handler.
2021 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2022 * chance last time (mostly it has become eligible now since we have probably
2023 * yielded to lockholder in last iteration. This is done by toggling
2024 * @dy_eligible each time a VCPU checked for eligibility.)
2026 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2027 * to preempted lock-holder could result in wrong VCPU selection and CPU
2028 * burning. Giving priority for a potential lock-holder increases lock
2031 * Since algorithm is based on heuristics, accessing another VCPU data without
2032 * locking does not harm. It may result in trying to yield to same VCPU, fail
2033 * and continue with next VCPU and so on.
2035 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
2037 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2040 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
2041 vcpu
->spin_loop
.dy_eligible
;
2043 if (vcpu
->spin_loop
.in_spin_loop
)
2044 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
2052 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
2054 struct kvm
*kvm
= me
->kvm
;
2055 struct kvm_vcpu
*vcpu
;
2056 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
2062 kvm_vcpu_set_in_spin_loop(me
, true);
2064 * We boost the priority of a VCPU that is runnable but not
2065 * currently running, because it got preempted by something
2066 * else and called schedule in __vcpu_run. Hopefully that
2067 * VCPU is holding the lock that we need and will release it.
2068 * We approximate round-robin by starting at the last boosted VCPU.
2070 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
2071 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
2072 if (!pass
&& i
<= last_boosted_vcpu
) {
2073 i
= last_boosted_vcpu
;
2075 } else if (pass
&& i
> last_boosted_vcpu
)
2077 if (!ACCESS_ONCE(vcpu
->preempted
))
2081 if (waitqueue_active(&vcpu
->wq
) && !kvm_arch_vcpu_runnable(vcpu
))
2083 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
2086 yielded
= kvm_vcpu_yield_to(vcpu
);
2088 kvm
->last_boosted_vcpu
= i
;
2090 } else if (yielded
< 0) {
2097 kvm_vcpu_set_in_spin_loop(me
, false);
2099 /* Ensure vcpu is not eligible during next spinloop */
2100 kvm_vcpu_set_dy_eligible(me
, false);
2102 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
2104 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2106 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
2109 if (vmf
->pgoff
== 0)
2110 page
= virt_to_page(vcpu
->run
);
2112 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
2113 page
= virt_to_page(vcpu
->arch
.pio_data
);
2115 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2116 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
2117 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
2120 return kvm_arch_vcpu_fault(vcpu
, vmf
);
2126 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
2127 .fault
= kvm_vcpu_fault
,
2130 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2132 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
2136 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
2138 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2140 kvm_put_kvm(vcpu
->kvm
);
2144 static struct file_operations kvm_vcpu_fops
= {
2145 .release
= kvm_vcpu_release
,
2146 .unlocked_ioctl
= kvm_vcpu_ioctl
,
2147 #ifdef CONFIG_KVM_COMPAT
2148 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
2150 .mmap
= kvm_vcpu_mmap
,
2151 .llseek
= noop_llseek
,
2155 * Allocates an inode for the vcpu.
2157 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
2159 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
2163 * Creates some virtual cpus. Good luck creating more than one.
2165 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
2168 struct kvm_vcpu
*vcpu
, *v
;
2170 if (id
>= KVM_MAX_VCPUS
)
2173 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
2175 return PTR_ERR(vcpu
);
2177 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
2179 r
= kvm_arch_vcpu_setup(vcpu
);
2183 mutex_lock(&kvm
->lock
);
2184 if (!kvm_vcpu_compatible(vcpu
)) {
2186 goto unlock_vcpu_destroy
;
2188 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
2190 goto unlock_vcpu_destroy
;
2193 kvm_for_each_vcpu(r
, v
, kvm
)
2194 if (v
->vcpu_id
== id
) {
2196 goto unlock_vcpu_destroy
;
2199 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
2201 /* Now it's all set up, let userspace reach it */
2203 r
= create_vcpu_fd(vcpu
);
2206 goto unlock_vcpu_destroy
;
2209 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
2212 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2213 * before kvm->online_vcpu's incremented value.
2216 atomic_inc(&kvm
->online_vcpus
);
2218 mutex_unlock(&kvm
->lock
);
2219 kvm_arch_vcpu_postcreate(vcpu
);
2222 unlock_vcpu_destroy
:
2223 mutex_unlock(&kvm
->lock
);
2225 kvm_arch_vcpu_destroy(vcpu
);
2229 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
2232 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
2233 vcpu
->sigset_active
= 1;
2234 vcpu
->sigset
= *sigset
;
2236 vcpu
->sigset_active
= 0;
2240 static long kvm_vcpu_ioctl(struct file
*filp
,
2241 unsigned int ioctl
, unsigned long arg
)
2243 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2244 void __user
*argp
= (void __user
*)arg
;
2246 struct kvm_fpu
*fpu
= NULL
;
2247 struct kvm_sregs
*kvm_sregs
= NULL
;
2249 if (vcpu
->kvm
->mm
!= current
->mm
)
2252 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
2255 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2257 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2258 * so vcpu_load() would break it.
2260 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_S390_IRQ
|| ioctl
== KVM_INTERRUPT
)
2261 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2265 r
= vcpu_load(vcpu
);
2273 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
2274 /* The thread running this VCPU changed. */
2275 struct pid
*oldpid
= vcpu
->pid
;
2276 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
2278 rcu_assign_pointer(vcpu
->pid
, newpid
);
2283 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
2284 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
2286 case KVM_GET_REGS
: {
2287 struct kvm_regs
*kvm_regs
;
2290 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
2293 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2297 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2304 case KVM_SET_REGS
: {
2305 struct kvm_regs
*kvm_regs
;
2308 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2309 if (IS_ERR(kvm_regs
)) {
2310 r
= PTR_ERR(kvm_regs
);
2313 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2317 case KVM_GET_SREGS
: {
2318 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2322 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2326 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2331 case KVM_SET_SREGS
: {
2332 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2333 if (IS_ERR(kvm_sregs
)) {
2334 r
= PTR_ERR(kvm_sregs
);
2338 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2341 case KVM_GET_MP_STATE
: {
2342 struct kvm_mp_state mp_state
;
2344 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2348 if (copy_to_user(argp
, &mp_state
, sizeof(mp_state
)))
2353 case KVM_SET_MP_STATE
: {
2354 struct kvm_mp_state mp_state
;
2357 if (copy_from_user(&mp_state
, argp
, sizeof(mp_state
)))
2359 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2362 case KVM_TRANSLATE
: {
2363 struct kvm_translation tr
;
2366 if (copy_from_user(&tr
, argp
, sizeof(tr
)))
2368 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2372 if (copy_to_user(argp
, &tr
, sizeof(tr
)))
2377 case KVM_SET_GUEST_DEBUG
: {
2378 struct kvm_guest_debug dbg
;
2381 if (copy_from_user(&dbg
, argp
, sizeof(dbg
)))
2383 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2386 case KVM_SET_SIGNAL_MASK
: {
2387 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2388 struct kvm_signal_mask kvm_sigmask
;
2389 sigset_t sigset
, *p
;
2394 if (copy_from_user(&kvm_sigmask
, argp
,
2395 sizeof(kvm_sigmask
)))
2398 if (kvm_sigmask
.len
!= sizeof(sigset
))
2401 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2406 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2410 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2414 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2418 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2424 fpu
= memdup_user(argp
, sizeof(*fpu
));
2430 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2434 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2443 #ifdef CONFIG_KVM_COMPAT
2444 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2445 unsigned int ioctl
, unsigned long arg
)
2447 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2448 void __user
*argp
= compat_ptr(arg
);
2451 if (vcpu
->kvm
->mm
!= current
->mm
)
2455 case KVM_SET_SIGNAL_MASK
: {
2456 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2457 struct kvm_signal_mask kvm_sigmask
;
2458 compat_sigset_t csigset
;
2463 if (copy_from_user(&kvm_sigmask
, argp
,
2464 sizeof(kvm_sigmask
)))
2467 if (kvm_sigmask
.len
!= sizeof(csigset
))
2470 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2473 sigset_from_compat(&sigset
, &csigset
);
2474 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2476 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2480 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2488 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2489 int (*accessor
)(struct kvm_device
*dev
,
2490 struct kvm_device_attr
*attr
),
2493 struct kvm_device_attr attr
;
2498 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2501 return accessor(dev
, &attr
);
2504 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2507 struct kvm_device
*dev
= filp
->private_data
;
2510 case KVM_SET_DEVICE_ATTR
:
2511 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2512 case KVM_GET_DEVICE_ATTR
:
2513 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2514 case KVM_HAS_DEVICE_ATTR
:
2515 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
2517 if (dev
->ops
->ioctl
)
2518 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
2524 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
2526 struct kvm_device
*dev
= filp
->private_data
;
2527 struct kvm
*kvm
= dev
->kvm
;
2533 static const struct file_operations kvm_device_fops
= {
2534 .unlocked_ioctl
= kvm_device_ioctl
,
2535 #ifdef CONFIG_KVM_COMPAT
2536 .compat_ioctl
= kvm_device_ioctl
,
2538 .release
= kvm_device_release
,
2541 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
2543 if (filp
->f_op
!= &kvm_device_fops
)
2546 return filp
->private_data
;
2549 static struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
2550 #ifdef CONFIG_KVM_MPIC
2551 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
2552 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
2555 #ifdef CONFIG_KVM_XICS
2556 [KVM_DEV_TYPE_XICS
] = &kvm_xics_ops
,
2560 int kvm_register_device_ops(struct kvm_device_ops
*ops
, u32 type
)
2562 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
2565 if (kvm_device_ops_table
[type
] != NULL
)
2568 kvm_device_ops_table
[type
] = ops
;
2572 void kvm_unregister_device_ops(u32 type
)
2574 if (kvm_device_ops_table
[type
] != NULL
)
2575 kvm_device_ops_table
[type
] = NULL
;
2578 static int kvm_ioctl_create_device(struct kvm
*kvm
,
2579 struct kvm_create_device
*cd
)
2581 struct kvm_device_ops
*ops
= NULL
;
2582 struct kvm_device
*dev
;
2583 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
2586 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
2589 ops
= kvm_device_ops_table
[cd
->type
];
2596 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2603 ret
= ops
->create(dev
, cd
->type
);
2609 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
2615 list_add(&dev
->vm_node
, &kvm
->devices
);
2621 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
2624 case KVM_CAP_USER_MEMORY
:
2625 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2626 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2627 case KVM_CAP_INTERNAL_ERROR_DATA
:
2628 #ifdef CONFIG_HAVE_KVM_MSI
2629 case KVM_CAP_SIGNAL_MSI
:
2631 #ifdef CONFIG_HAVE_KVM_IRQFD
2633 case KVM_CAP_IRQFD_RESAMPLE
:
2635 case KVM_CAP_CHECK_EXTENSION_VM
:
2637 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2638 case KVM_CAP_IRQ_ROUTING
:
2639 return KVM_MAX_IRQ_ROUTES
;
2641 #if KVM_ADDRESS_SPACE_NUM > 1
2642 case KVM_CAP_MULTI_ADDRESS_SPACE
:
2643 return KVM_ADDRESS_SPACE_NUM
;
2648 return kvm_vm_ioctl_check_extension(kvm
, arg
);
2651 static long kvm_vm_ioctl(struct file
*filp
,
2652 unsigned int ioctl
, unsigned long arg
)
2654 struct kvm
*kvm
= filp
->private_data
;
2655 void __user
*argp
= (void __user
*)arg
;
2658 if (kvm
->mm
!= current
->mm
)
2661 case KVM_CREATE_VCPU
:
2662 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2664 case KVM_SET_USER_MEMORY_REGION
: {
2665 struct kvm_userspace_memory_region kvm_userspace_mem
;
2668 if (copy_from_user(&kvm_userspace_mem
, argp
,
2669 sizeof(kvm_userspace_mem
)))
2672 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
2675 case KVM_GET_DIRTY_LOG
: {
2676 struct kvm_dirty_log log
;
2679 if (copy_from_user(&log
, argp
, sizeof(log
)))
2681 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2684 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2685 case KVM_REGISTER_COALESCED_MMIO
: {
2686 struct kvm_coalesced_mmio_zone zone
;
2689 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2691 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2694 case KVM_UNREGISTER_COALESCED_MMIO
: {
2695 struct kvm_coalesced_mmio_zone zone
;
2698 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2700 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2705 struct kvm_irqfd data
;
2708 if (copy_from_user(&data
, argp
, sizeof(data
)))
2710 r
= kvm_irqfd(kvm
, &data
);
2713 case KVM_IOEVENTFD
: {
2714 struct kvm_ioeventfd data
;
2717 if (copy_from_user(&data
, argp
, sizeof(data
)))
2719 r
= kvm_ioeventfd(kvm
, &data
);
2722 #ifdef CONFIG_HAVE_KVM_MSI
2723 case KVM_SIGNAL_MSI
: {
2727 if (copy_from_user(&msi
, argp
, sizeof(msi
)))
2729 r
= kvm_send_userspace_msi(kvm
, &msi
);
2733 #ifdef __KVM_HAVE_IRQ_LINE
2734 case KVM_IRQ_LINE_STATUS
:
2735 case KVM_IRQ_LINE
: {
2736 struct kvm_irq_level irq_event
;
2739 if (copy_from_user(&irq_event
, argp
, sizeof(irq_event
)))
2742 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
2743 ioctl
== KVM_IRQ_LINE_STATUS
);
2748 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
2749 if (copy_to_user(argp
, &irq_event
, sizeof(irq_event
)))
2757 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2758 case KVM_SET_GSI_ROUTING
: {
2759 struct kvm_irq_routing routing
;
2760 struct kvm_irq_routing __user
*urouting
;
2761 struct kvm_irq_routing_entry
*entries
;
2764 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
2767 if (routing
.nr
>= KVM_MAX_IRQ_ROUTES
)
2772 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
2777 if (copy_from_user(entries
, urouting
->entries
,
2778 routing
.nr
* sizeof(*entries
)))
2779 goto out_free_irq_routing
;
2780 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
2782 out_free_irq_routing
:
2786 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2787 case KVM_CREATE_DEVICE
: {
2788 struct kvm_create_device cd
;
2791 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
2794 r
= kvm_ioctl_create_device(kvm
, &cd
);
2799 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
2805 case KVM_CHECK_EXTENSION
:
2806 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
2809 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2815 #ifdef CONFIG_KVM_COMPAT
2816 struct compat_kvm_dirty_log
{
2820 compat_uptr_t dirty_bitmap
; /* one bit per page */
2825 static long kvm_vm_compat_ioctl(struct file
*filp
,
2826 unsigned int ioctl
, unsigned long arg
)
2828 struct kvm
*kvm
= filp
->private_data
;
2831 if (kvm
->mm
!= current
->mm
)
2834 case KVM_GET_DIRTY_LOG
: {
2835 struct compat_kvm_dirty_log compat_log
;
2836 struct kvm_dirty_log log
;
2839 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2840 sizeof(compat_log
)))
2842 log
.slot
= compat_log
.slot
;
2843 log
.padding1
= compat_log
.padding1
;
2844 log
.padding2
= compat_log
.padding2
;
2845 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2847 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2851 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2859 static struct file_operations kvm_vm_fops
= {
2860 .release
= kvm_vm_release
,
2861 .unlocked_ioctl
= kvm_vm_ioctl
,
2862 #ifdef CONFIG_KVM_COMPAT
2863 .compat_ioctl
= kvm_vm_compat_ioctl
,
2865 .llseek
= noop_llseek
,
2868 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2873 kvm
= kvm_create_vm(type
);
2875 return PTR_ERR(kvm
);
2876 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2877 r
= kvm_coalesced_mmio_init(kvm
);
2883 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
| O_CLOEXEC
);
2890 static long kvm_dev_ioctl(struct file
*filp
,
2891 unsigned int ioctl
, unsigned long arg
)
2896 case KVM_GET_API_VERSION
:
2899 r
= KVM_API_VERSION
;
2902 r
= kvm_dev_ioctl_create_vm(arg
);
2904 case KVM_CHECK_EXTENSION
:
2905 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
2907 case KVM_GET_VCPU_MMAP_SIZE
:
2910 r
= PAGE_SIZE
; /* struct kvm_run */
2912 r
+= PAGE_SIZE
; /* pio data page */
2914 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2915 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2918 case KVM_TRACE_ENABLE
:
2919 case KVM_TRACE_PAUSE
:
2920 case KVM_TRACE_DISABLE
:
2924 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2930 static struct file_operations kvm_chardev_ops
= {
2931 .unlocked_ioctl
= kvm_dev_ioctl
,
2932 .compat_ioctl
= kvm_dev_ioctl
,
2933 .llseek
= noop_llseek
,
2936 static struct miscdevice kvm_dev
= {
2942 static void hardware_enable_nolock(void *junk
)
2944 int cpu
= raw_smp_processor_id();
2947 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2950 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2952 r
= kvm_arch_hardware_enable();
2955 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2956 atomic_inc(&hardware_enable_failed
);
2957 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu
);
2961 static void hardware_enable(void)
2963 raw_spin_lock(&kvm_count_lock
);
2964 if (kvm_usage_count
)
2965 hardware_enable_nolock(NULL
);
2966 raw_spin_unlock(&kvm_count_lock
);
2969 static void hardware_disable_nolock(void *junk
)
2971 int cpu
= raw_smp_processor_id();
2973 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2975 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2976 kvm_arch_hardware_disable();
2979 static void hardware_disable(void)
2981 raw_spin_lock(&kvm_count_lock
);
2982 if (kvm_usage_count
)
2983 hardware_disable_nolock(NULL
);
2984 raw_spin_unlock(&kvm_count_lock
);
2987 static void hardware_disable_all_nolock(void)
2989 BUG_ON(!kvm_usage_count
);
2992 if (!kvm_usage_count
)
2993 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2996 static void hardware_disable_all(void)
2998 raw_spin_lock(&kvm_count_lock
);
2999 hardware_disable_all_nolock();
3000 raw_spin_unlock(&kvm_count_lock
);
3003 static int hardware_enable_all(void)
3007 raw_spin_lock(&kvm_count_lock
);
3010 if (kvm_usage_count
== 1) {
3011 atomic_set(&hardware_enable_failed
, 0);
3012 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
3014 if (atomic_read(&hardware_enable_failed
)) {
3015 hardware_disable_all_nolock();
3020 raw_spin_unlock(&kvm_count_lock
);
3025 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
3028 val
&= ~CPU_TASKS_FROZEN
;
3040 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
3044 * Some (well, at least mine) BIOSes hang on reboot if
3047 * And Intel TXT required VMX off for all cpu when system shutdown.
3049 pr_info("kvm: exiting hardware virtualization\n");
3050 kvm_rebooting
= true;
3051 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3055 static struct notifier_block kvm_reboot_notifier
= {
3056 .notifier_call
= kvm_reboot
,
3060 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
3064 for (i
= 0; i
< bus
->dev_count
; i
++) {
3065 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
3067 kvm_iodevice_destructor(pos
);
3072 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
3073 const struct kvm_io_range
*r2
)
3075 if (r1
->addr
< r2
->addr
)
3077 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
3082 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
3084 return kvm_io_bus_cmp(p1
, p2
);
3087 static int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
3088 gpa_t addr
, int len
)
3090 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
3096 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
3097 kvm_io_bus_sort_cmp
, NULL
);
3102 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
3103 gpa_t addr
, int len
)
3105 struct kvm_io_range
*range
, key
;
3108 key
= (struct kvm_io_range
) {
3113 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
3114 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
3118 off
= range
- bus
->range
;
3120 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
3126 static int __kvm_io_bus_write(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3127 struct kvm_io_range
*range
, const void *val
)
3131 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3135 while (idx
< bus
->dev_count
&&
3136 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3137 if (!kvm_iodevice_write(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3146 /* kvm_io_bus_write - called under kvm->slots_lock */
3147 int kvm_io_bus_write(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3148 int len
, const void *val
)
3150 struct kvm_io_bus
*bus
;
3151 struct kvm_io_range range
;
3154 range
= (struct kvm_io_range
) {
3159 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3160 r
= __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3161 return r
< 0 ? r
: 0;
3164 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3165 int kvm_io_bus_write_cookie(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
,
3166 gpa_t addr
, int len
, const void *val
, long cookie
)
3168 struct kvm_io_bus
*bus
;
3169 struct kvm_io_range range
;
3171 range
= (struct kvm_io_range
) {
3176 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3178 /* First try the device referenced by cookie. */
3179 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
3180 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
3181 if (!kvm_iodevice_write(vcpu
, bus
->range
[cookie
].dev
, addr
, len
,
3186 * cookie contained garbage; fall back to search and return the
3187 * correct cookie value.
3189 return __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3192 static int __kvm_io_bus_read(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3193 struct kvm_io_range
*range
, void *val
)
3197 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3201 while (idx
< bus
->dev_count
&&
3202 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3203 if (!kvm_iodevice_read(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3211 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
3213 /* kvm_io_bus_read - called under kvm->slots_lock */
3214 int kvm_io_bus_read(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3217 struct kvm_io_bus
*bus
;
3218 struct kvm_io_range range
;
3221 range
= (struct kvm_io_range
) {
3226 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3227 r
= __kvm_io_bus_read(vcpu
, bus
, &range
, val
);
3228 return r
< 0 ? r
: 0;
3232 /* Caller must hold slots_lock. */
3233 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
3234 int len
, struct kvm_io_device
*dev
)
3236 struct kvm_io_bus
*new_bus
, *bus
;
3238 bus
= kvm
->buses
[bus_idx
];
3239 /* exclude ioeventfd which is limited by maximum fd */
3240 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
3243 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
3244 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3247 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
3248 sizeof(struct kvm_io_range
)));
3249 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
3250 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3251 synchronize_srcu_expedited(&kvm
->srcu
);
3257 /* Caller must hold slots_lock. */
3258 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3259 struct kvm_io_device
*dev
)
3262 struct kvm_io_bus
*new_bus
, *bus
;
3264 bus
= kvm
->buses
[bus_idx
];
3266 for (i
= 0; i
< bus
->dev_count
; i
++)
3267 if (bus
->range
[i
].dev
== dev
) {
3275 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
3276 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3280 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3281 new_bus
->dev_count
--;
3282 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3283 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3285 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3286 synchronize_srcu_expedited(&kvm
->srcu
);
3291 static struct notifier_block kvm_cpu_notifier
= {
3292 .notifier_call
= kvm_cpu_hotplug
,
3295 static int vm_stat_get(void *_offset
, u64
*val
)
3297 unsigned offset
= (long)_offset
;
3301 spin_lock(&kvm_lock
);
3302 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3303 *val
+= *(u32
*)((void *)kvm
+ offset
);
3304 spin_unlock(&kvm_lock
);
3308 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
3310 static int vcpu_stat_get(void *_offset
, u64
*val
)
3312 unsigned offset
= (long)_offset
;
3314 struct kvm_vcpu
*vcpu
;
3318 spin_lock(&kvm_lock
);
3319 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3320 kvm_for_each_vcpu(i
, vcpu
, kvm
)
3321 *val
+= *(u32
*)((void *)vcpu
+ offset
);
3323 spin_unlock(&kvm_lock
);
3327 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
3329 static const struct file_operations
*stat_fops
[] = {
3330 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
3331 [KVM_STAT_VM
] = &vm_stat_fops
,
3334 static int kvm_init_debug(void)
3337 struct kvm_stats_debugfs_item
*p
;
3339 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
3340 if (kvm_debugfs_dir
== NULL
)
3343 for (p
= debugfs_entries
; p
->name
; ++p
) {
3344 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
3345 (void *)(long)p
->offset
,
3346 stat_fops
[p
->kind
]);
3347 if (p
->dentry
== NULL
)
3354 debugfs_remove_recursive(kvm_debugfs_dir
);
3359 static void kvm_exit_debug(void)
3361 struct kvm_stats_debugfs_item
*p
;
3363 for (p
= debugfs_entries
; p
->name
; ++p
)
3364 debugfs_remove(p
->dentry
);
3365 debugfs_remove(kvm_debugfs_dir
);
3368 static int kvm_suspend(void)
3370 if (kvm_usage_count
)
3371 hardware_disable_nolock(NULL
);
3375 static void kvm_resume(void)
3377 if (kvm_usage_count
) {
3378 WARN_ON(raw_spin_is_locked(&kvm_count_lock
));
3379 hardware_enable_nolock(NULL
);
3383 static struct syscore_ops kvm_syscore_ops
= {
3384 .suspend
= kvm_suspend
,
3385 .resume
= kvm_resume
,
3389 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
3391 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
3394 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
3396 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3398 if (vcpu
->preempted
)
3399 vcpu
->preempted
= false;
3401 kvm_arch_sched_in(vcpu
, cpu
);
3403 kvm_arch_vcpu_load(vcpu
, cpu
);
3406 static void kvm_sched_out(struct preempt_notifier
*pn
,
3407 struct task_struct
*next
)
3409 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3411 if (current
->state
== TASK_RUNNING
)
3412 vcpu
->preempted
= true;
3413 kvm_arch_vcpu_put(vcpu
);
3416 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
3417 struct module
*module
)
3422 r
= kvm_arch_init(opaque
);
3427 * kvm_arch_init makes sure there's at most one caller
3428 * for architectures that support multiple implementations,
3429 * like intel and amd on x86.
3430 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3431 * conflicts in case kvm is already setup for another implementation.
3433 r
= kvm_irqfd_init();
3437 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
3442 r
= kvm_arch_hardware_setup();
3446 for_each_online_cpu(cpu
) {
3447 smp_call_function_single(cpu
,
3448 kvm_arch_check_processor_compat
,
3454 r
= register_cpu_notifier(&kvm_cpu_notifier
);
3457 register_reboot_notifier(&kvm_reboot_notifier
);
3459 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3461 vcpu_align
= __alignof__(struct kvm_vcpu
);
3462 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
3464 if (!kvm_vcpu_cache
) {
3469 r
= kvm_async_pf_init();
3473 kvm_chardev_ops
.owner
= module
;
3474 kvm_vm_fops
.owner
= module
;
3475 kvm_vcpu_fops
.owner
= module
;
3477 r
= misc_register(&kvm_dev
);
3479 pr_err("kvm: misc device register failed\n");
3483 register_syscore_ops(&kvm_syscore_ops
);
3485 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
3486 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
3488 r
= kvm_init_debug();
3490 pr_err("kvm: create debugfs files failed\n");
3494 r
= kvm_vfio_ops_init();
3500 unregister_syscore_ops(&kvm_syscore_ops
);
3501 misc_deregister(&kvm_dev
);
3503 kvm_async_pf_deinit();
3505 kmem_cache_destroy(kvm_vcpu_cache
);
3507 unregister_reboot_notifier(&kvm_reboot_notifier
);
3508 unregister_cpu_notifier(&kvm_cpu_notifier
);
3511 kvm_arch_hardware_unsetup();
3513 free_cpumask_var(cpus_hardware_enabled
);
3521 EXPORT_SYMBOL_GPL(kvm_init
);
3526 misc_deregister(&kvm_dev
);
3527 kmem_cache_destroy(kvm_vcpu_cache
);
3528 kvm_async_pf_deinit();
3529 unregister_syscore_ops(&kvm_syscore_ops
);
3530 unregister_reboot_notifier(&kvm_reboot_notifier
);
3531 unregister_cpu_notifier(&kvm_cpu_notifier
);
3532 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3533 kvm_arch_hardware_unsetup();
3536 free_cpumask_var(cpus_hardware_enabled
);
3537 kvm_vfio_ops_exit();
3539 EXPORT_SYMBOL_GPL(kvm_exit
);