blob: 0fbbf2d216034b712c52392dc5bdf2c29c15b34d [file] [log] [blame]
Avi Kivity6aa8b732006-12-10 02:21:36 -08001/*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
Nicolas Kaiser9611c182010-10-06 14:23:22 +02008 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
Avi Kivity6aa8b732006-12-10 02:21:36 -08009 *
10 * Authors:
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
13 *
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
16 *
17 */
18
Hollis Blancharde2174022007-12-03 15:30:24 -060019#include "iodev.h"
Avi Kivity6aa8b732006-12-10 02:21:36 -080020
Avi Kivityedf88412007-12-16 11:02:48 +020021#include <linux/kvm_host.h>
Avi Kivity6aa8b732006-12-10 02:21:36 -080022#include <linux/kvm.h>
23#include <linux/module.h>
24#include <linux/errno.h>
Avi Kivity6aa8b732006-12-10 02:21:36 -080025#include <linux/percpu.h>
Avi Kivity6aa8b732006-12-10 02:21:36 -080026#include <linux/mm.h>
27#include <linux/miscdevice.h>
28#include <linux/vmalloc.h>
Avi Kivity6aa8b732006-12-10 02:21:36 -080029#include <linux/reboot.h>
Avi Kivity6aa8b732006-12-10 02:21:36 -080030#include <linux/debugfs.h>
31#include <linux/highmem.h>
32#include <linux/file.h>
Rafael J. Wysockifb3600c2011-03-23 22:16:23 +010033#include <linux/syscore_ops.h>
Avi Kivity774c47f2007-02-12 00:54:47 -080034#include <linux/cpu.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040035#include <linux/sched.h>
Avi Kivityd9e368d2007-06-07 19:18:30 +030036#include <linux/cpumask.h>
37#include <linux/smp.h>
Avi Kivityd6d28162007-06-28 08:38:16 -040038#include <linux/anon_inodes.h>
Avi Kivity04d2cc72007-09-10 18:10:54 +030039#include <linux/profile.h>
Anthony Liguori7aa81cc2007-09-17 14:57:50 -050040#include <linux/kvm_para.h>
Izik Eidus6fc138d2007-10-09 19:20:39 +020041#include <linux/pagemap.h>
Anthony Liguori8d4e1282007-10-18 09:59:34 -050042#include <linux/mman.h>
Anthony Liguori35149e22008-04-02 14:46:56 -050043#include <linux/swap.h>
Sheng Yange56d5322009-03-12 21:45:39 +080044#include <linux/bitops.h>
Marcelo Tosatti547de292009-05-07 17:55:13 -030045#include <linux/spinlock.h>
Arnd Bergmann6ff58942009-10-22 14:19:27 +020046#include <linux/compat.h>
Marcelo Tosattibc6678a2009-12-23 14:35:21 -020047#include <linux/srcu.h>
Joerg Roedel8f0b1ab2010-01-28 12:37:56 +010048#include <linux/hugetlb.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090049#include <linux/slab.h>
Sasha Levin743eeb02011-07-27 16:00:48 +030050#include <linux/sort.h>
51#include <linux/bsearch.h>
Avi Kivity6aa8b732006-12-10 02:21:36 -080052
Avi Kivitye4956062007-06-28 14:15:57 -040053#include <asm/processor.h>
Avi Kivitye4956062007-06-28 14:15:57 -040054#include <asm/io.h>
55#include <asm/uaccess.h>
Izik Eidus3e021bf2007-11-19 11:16:57 +020056#include <asm/pgtable.h>
Avi Kivity6aa8b732006-12-10 02:21:36 -080057
Laurent Vivier5f94c172008-05-30 16:05:54 +020058#include "coalesced_mmio.h"
Gleb Natapovaf585b92010-10-14 11:22:46 +020059#include "async_pf.h"
Laurent Vivier5f94c172008-05-30 16:05:54 +020060
Marcelo Tosatti229456f2009-06-17 09:22:14 -030061#define CREATE_TRACE_POINTS
62#include <trace/events/kvm.h>
63
Avi Kivity6aa8b732006-12-10 02:21:36 -080064MODULE_AUTHOR("Qumranet");
65MODULE_LICENSE("GPL");
66
Marcelo Tosattifa40a822009-06-04 15:08:24 -030067/*
68 * Ordering of locks:
69 *
Sheng Yangfae3a352009-12-15 10:28:07 +080070 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
Marcelo Tosattifa40a822009-06-04 15:08:24 -030071 */
72
Jan Kiszkae935b832011-02-08 12:55:33 +010073DEFINE_RAW_SPINLOCK(kvm_lock);
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +080074LIST_HEAD(vm_list);
Avi Kivity133de902007-02-12 00:54:44 -080075
Rusty Russell7f59f492008-12-07 21:25:45 +103076static cpumask_var_t cpus_hardware_enabled;
Alexander Graf10474ae2009-09-15 11:37:46 +020077static int kvm_usage_count = 0;
78static atomic_t hardware_enable_failed;
Avi Kivity1b6c0162007-05-24 13:03:52 +030079
Rusty Russellc16f8622007-07-30 21:12:19 +100080struct kmem_cache *kvm_vcpu_cache;
81EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
Avi Kivity1165f5f2007-04-19 17:27:43 +030082
Avi Kivity15ad7142007-07-11 18:17:21 +030083static __read_mostly struct preempt_ops kvm_preempt_ops;
84
Hollis Blanchard76f7c872008-04-15 16:05:42 -050085struct dentry *kvm_debugfs_dir;
Avi Kivity6aa8b732006-12-10 02:21:36 -080086
Avi Kivitybccf2152007-02-21 18:04:26 +020087static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
88 unsigned long arg);
Alexander Graf1dda6062011-06-08 02:45:37 +020089#ifdef CONFIG_COMPAT
90static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
91 unsigned long arg);
92#endif
Alexander Graf10474ae2009-09-15 11:37:46 +020093static int hardware_enable_all(void);
94static void hardware_disable_all(void);
Avi Kivitybccf2152007-02-21 18:04:26 +020095
Marcelo Tosattie93f8a02009-12-23 14:35:24 -020096static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
97
Avi Kivityb7c41452010-12-02 17:52:50 +020098bool kvm_rebooting;
99EXPORT_SYMBOL_GPL(kvm_rebooting);
Avi Kivity4ecac3f2008-05-13 13:23:38 +0300100
Marcelo Tosatti54dee992009-06-11 12:07:44 -0300101static bool largepages_enabled = true;
102
Gleb Natapovfa7bff82010-07-07 20:16:44 +0300103static struct page *hwpoison_page;
104static pfn_t hwpoison_pfn;
Huang Yingbf998152010-05-31 14:28:19 +0800105
Xiao Guangrong903816f2012-07-17 21:54:11 +0800106static struct page *fault_page;
107static pfn_t fault_pfn;
Gleb Natapovedba23e2010-07-07 20:16:45 +0300108
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +0800109inline int kvm_is_mmio_pfn(pfn_t pfn)
Ben-Ami Yassourcbff90a2008-07-28 19:26:24 +0300110{
Joerg Roedelfc5659c2009-02-18 14:08:58 +0100111 if (pfn_valid(pfn)) {
Andrea Arcangeli22e5c472011-01-13 15:47:20 -0800112 int reserved;
Andrea Arcangeli936a5fe2011-01-13 15:46:48 -0800113 struct page *tail = pfn_to_page(pfn);
Andrea Arcangeli22e5c472011-01-13 15:47:20 -0800114 struct page *head = compound_trans_head(tail);
115 reserved = PageReserved(head);
Andrea Arcangeli936a5fe2011-01-13 15:46:48 -0800116 if (head != tail) {
Andrea Arcangeli936a5fe2011-01-13 15:46:48 -0800117 /*
Andrea Arcangeli22e5c472011-01-13 15:47:20 -0800118 * "head" is not a dangling pointer
119 * (compound_trans_head takes care of that)
120 * but the hugepage may have been splitted
121 * from under us (and we may not hold a
122 * reference count on the head page so it can
123 * be reused before we run PageReferenced), so
124 * we've to check PageTail before returning
125 * what we just read.
Andrea Arcangeli936a5fe2011-01-13 15:46:48 -0800126 */
Andrea Arcangeli22e5c472011-01-13 15:47:20 -0800127 smp_rmb();
128 if (PageTail(tail))
129 return reserved;
Andrea Arcangeli936a5fe2011-01-13 15:46:48 -0800130 }
131 return PageReserved(tail);
Joerg Roedelfc5659c2009-02-18 14:08:58 +0100132 }
Ben-Ami Yassourcbff90a2008-07-28 19:26:24 +0300133
134 return true;
135}
136
Avi Kivity6aa8b732006-12-10 02:21:36 -0800137/*
138 * Switches to specified vcpu, until a matching vcpu_put()
139 */
Carsten Otte313a3dc2007-10-11 19:16:52 +0200140void vcpu_load(struct kvm_vcpu *vcpu)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800141{
Avi Kivity15ad7142007-07-11 18:17:21 +0300142 int cpu;
143
Avi Kivitybccf2152007-02-21 18:04:26 +0200144 mutex_lock(&vcpu->mutex);
Rik van Riel34bb10b2011-02-01 09:52:41 -0500145 if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
146 /* The thread running this VCPU changed. */
147 struct pid *oldpid = vcpu->pid;
148 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
149 rcu_assign_pointer(vcpu->pid, newpid);
150 synchronize_rcu();
151 put_pid(oldpid);
152 }
Avi Kivity15ad7142007-07-11 18:17:21 +0300153 cpu = get_cpu();
154 preempt_notifier_register(&vcpu->preempt_notifier);
Carsten Otte313a3dc2007-10-11 19:16:52 +0200155 kvm_arch_vcpu_load(vcpu, cpu);
Avi Kivity15ad7142007-07-11 18:17:21 +0300156 put_cpu();
Avi Kivitybccf2152007-02-21 18:04:26 +0200157}
158
Carsten Otte313a3dc2007-10-11 19:16:52 +0200159void vcpu_put(struct kvm_vcpu *vcpu)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800160{
Avi Kivity15ad7142007-07-11 18:17:21 +0300161 preempt_disable();
Carsten Otte313a3dc2007-10-11 19:16:52 +0200162 kvm_arch_vcpu_put(vcpu);
Avi Kivity15ad7142007-07-11 18:17:21 +0300163 preempt_notifier_unregister(&vcpu->preempt_notifier);
164 preempt_enable();
Avi Kivity6aa8b732006-12-10 02:21:36 -0800165 mutex_unlock(&vcpu->mutex);
166}
167
Avi Kivityd9e368d2007-06-07 19:18:30 +0300168static void ack_flush(void *_completed)
169{
Avi Kivityd9e368d2007-06-07 19:18:30 +0300170}
171
Rusty Russell49846892008-12-08 20:26:24 +1030172static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
Avi Kivityd9e368d2007-06-07 19:18:30 +0300173{
Avi Kivity597a5f52008-07-20 14:24:22 +0300174 int i, cpu, me;
Rusty Russell6ef7a1b2008-12-08 20:28:04 +1030175 cpumask_var_t cpus;
176 bool called = true;
Avi Kivityd9e368d2007-06-07 19:18:30 +0300177 struct kvm_vcpu *vcpu;
Avi Kivityd9e368d2007-06-07 19:18:30 +0300178
Li Zefan79f55992009-06-15 14:58:26 +0800179 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
Rusty Russell6ef7a1b2008-12-08 20:28:04 +1030180
Xiao Guangrong3cba4132011-01-12 15:41:22 +0800181 me = get_cpu();
Gleb Natapov988a2ca2009-06-09 15:56:29 +0300182 kvm_for_each_vcpu(i, vcpu, kvm) {
Xiao Guangrong3cba4132011-01-12 15:41:22 +0800183 kvm_make_request(req, vcpu);
Avi Kivityd9e368d2007-06-07 19:18:30 +0300184 cpu = vcpu->cpu;
Xiao Guangrong6b7e2d02011-01-12 15:40:31 +0800185
186 /* Set ->requests bit before we read ->mode */
187 smp_mb();
188
189 if (cpus != NULL && cpu != -1 && cpu != me &&
190 kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
Rusty Russell6ef7a1b2008-12-08 20:28:04 +1030191 cpumask_set_cpu(cpu, cpus);
Avi Kivityd9e368d2007-06-07 19:18:30 +0300192 }
Rusty Russell6ef7a1b2008-12-08 20:28:04 +1030193 if (unlikely(cpus == NULL))
194 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
195 else if (!cpumask_empty(cpus))
196 smp_call_function_many(cpus, ack_flush, NULL, 1);
197 else
198 called = false;
Xiao Guangrong3cba4132011-01-12 15:41:22 +0800199 put_cpu();
Rusty Russell6ef7a1b2008-12-08 20:28:04 +1030200 free_cpumask_var(cpus);
Rusty Russell49846892008-12-08 20:26:24 +1030201 return called;
202}
203
204void kvm_flush_remote_tlbs(struct kvm *kvm)
205{
Alex Shibec87d62012-03-04 13:13:38 +0800206 long dirty_count = kvm->tlbs_dirty;
Xiao Guangronga4ee1ca2010-11-23 11:13:00 +0800207
208 smp_mb();
Rusty Russell49846892008-12-08 20:26:24 +1030209 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
210 ++kvm->stat.remote_tlb_flush;
Xiao Guangronga4ee1ca2010-11-23 11:13:00 +0800211 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
Avi Kivityd9e368d2007-06-07 19:18:30 +0300212}
213
Marcelo Tosatti2e53d632008-02-20 14:47:24 -0500214void kvm_reload_remote_mmus(struct kvm *kvm)
215{
Rusty Russell49846892008-12-08 20:26:24 +1030216 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
Marcelo Tosatti2e53d632008-02-20 14:47:24 -0500217}
218
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000219int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
220{
221 struct page *page;
222 int r;
223
224 mutex_init(&vcpu->mutex);
225 vcpu->cpu = -1;
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000226 vcpu->kvm = kvm;
227 vcpu->vcpu_id = id;
Rik van Riel34bb10b2011-02-01 09:52:41 -0500228 vcpu->pid = NULL;
Eddie Dongb6958ce2007-07-18 12:15:21 +0300229 init_waitqueue_head(&vcpu->wq);
Gleb Natapovaf585b92010-10-14 11:22:46 +0200230 kvm_async_pf_vcpu_init(vcpu);
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000231
232 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
233 if (!page) {
234 r = -ENOMEM;
235 goto fail;
236 }
237 vcpu->run = page_address(page);
238
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +0800239 r = kvm_arch_vcpu_init(vcpu);
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000240 if (r < 0)
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +0800241 goto fail_free_run;
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000242 return 0;
243
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000244fail_free_run:
245 free_page((unsigned long)vcpu->run);
246fail:
Rusty Russell76fafa52007-10-08 10:50:48 +1000247 return r;
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000248}
249EXPORT_SYMBOL_GPL(kvm_vcpu_init);
250
251void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
252{
Rik van Riel34bb10b2011-02-01 09:52:41 -0500253 put_pid(vcpu->pid);
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +0800254 kvm_arch_vcpu_uninit(vcpu);
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000255 free_page((unsigned long)vcpu->run);
256}
257EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
258
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200259#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
260static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
261{
262 return container_of(mn, struct kvm, mmu_notifier);
263}
264
265static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
266 struct mm_struct *mm,
267 unsigned long address)
268{
269 struct kvm *kvm = mmu_notifier_to_kvm(mn);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200270 int need_tlb_flush, idx;
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200271
272 /*
273 * When ->invalidate_page runs, the linux pte has been zapped
274 * already but the page is still allocated until
275 * ->invalidate_page returns. So if we increase the sequence
276 * here the kvm page fault will notice if the spte can't be
277 * established because the page is going to be freed. If
278 * instead the kvm page fault establishes the spte before
279 * ->invalidate_page runs, kvm_unmap_hva will release it
280 * before returning.
281 *
282 * The sequence increase only need to be seen at spin_unlock
283 * time, and not at spin_lock time.
284 *
285 * Increasing the sequence after the spin_unlock would be
286 * unsafe because the kvm page fault could then establish the
287 * pte after kvm_unmap_hva returned, without noticing the page
288 * is going to be freed.
289 */
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200290 idx = srcu_read_lock(&kvm->srcu);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200291 spin_lock(&kvm->mmu_lock);
Takuya Yoshikawa565f3be2012-02-10 15:28:31 +0900292
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200293 kvm->mmu_notifier_seq++;
Xiao Guangronga4ee1ca2010-11-23 11:13:00 +0800294 need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200295 /* we've to flush the tlb before the pages can be freed */
296 if (need_tlb_flush)
297 kvm_flush_remote_tlbs(kvm);
298
Takuya Yoshikawa565f3be2012-02-10 15:28:31 +0900299 spin_unlock(&kvm->mmu_lock);
300 srcu_read_unlock(&kvm->srcu, idx);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200301}
302
Izik Eidus3da0dd42009-09-23 21:47:18 +0300303static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
304 struct mm_struct *mm,
305 unsigned long address,
306 pte_t pte)
307{
308 struct kvm *kvm = mmu_notifier_to_kvm(mn);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200309 int idx;
Izik Eidus3da0dd42009-09-23 21:47:18 +0300310
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200311 idx = srcu_read_lock(&kvm->srcu);
Izik Eidus3da0dd42009-09-23 21:47:18 +0300312 spin_lock(&kvm->mmu_lock);
313 kvm->mmu_notifier_seq++;
314 kvm_set_spte_hva(kvm, address, pte);
315 spin_unlock(&kvm->mmu_lock);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200316 srcu_read_unlock(&kvm->srcu, idx);
Izik Eidus3da0dd42009-09-23 21:47:18 +0300317}
318
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200319static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
320 struct mm_struct *mm,
321 unsigned long start,
322 unsigned long end)
323{
324 struct kvm *kvm = mmu_notifier_to_kvm(mn);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200325 int need_tlb_flush = 0, idx;
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200326
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200327 idx = srcu_read_lock(&kvm->srcu);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200328 spin_lock(&kvm->mmu_lock);
329 /*
330 * The count increase must become visible at unlock time as no
331 * spte can be established without taking the mmu_lock and
332 * count is also read inside the mmu_lock critical section.
333 */
334 kvm->mmu_notifier_count++;
Takuya Yoshikawab3ae2092012-07-02 17:56:33 +0900335 need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
Xiao Guangronga4ee1ca2010-11-23 11:13:00 +0800336 need_tlb_flush |= kvm->tlbs_dirty;
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200337 /* we've to flush the tlb before the pages can be freed */
338 if (need_tlb_flush)
339 kvm_flush_remote_tlbs(kvm);
Takuya Yoshikawa565f3be2012-02-10 15:28:31 +0900340
341 spin_unlock(&kvm->mmu_lock);
342 srcu_read_unlock(&kvm->srcu, idx);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200343}
344
345static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
346 struct mm_struct *mm,
347 unsigned long start,
348 unsigned long end)
349{
350 struct kvm *kvm = mmu_notifier_to_kvm(mn);
351
352 spin_lock(&kvm->mmu_lock);
353 /*
354 * This sequence increase will notify the kvm page fault that
355 * the page that is going to be mapped in the spte could have
356 * been freed.
357 */
358 kvm->mmu_notifier_seq++;
Paul Mackerrasa355aa52011-12-12 12:37:21 +0000359 smp_wmb();
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200360 /*
361 * The above sequence increase must be visible before the
Paul Mackerrasa355aa52011-12-12 12:37:21 +0000362 * below count decrease, which is ensured by the smp_wmb above
363 * in conjunction with the smp_rmb in mmu_notifier_retry().
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200364 */
365 kvm->mmu_notifier_count--;
366 spin_unlock(&kvm->mmu_lock);
367
368 BUG_ON(kvm->mmu_notifier_count < 0);
369}
370
371static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
372 struct mm_struct *mm,
373 unsigned long address)
374{
375 struct kvm *kvm = mmu_notifier_to_kvm(mn);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200376 int young, idx;
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200377
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200378 idx = srcu_read_lock(&kvm->srcu);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200379 spin_lock(&kvm->mmu_lock);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200380
Takuya Yoshikawa565f3be2012-02-10 15:28:31 +0900381 young = kvm_age_hva(kvm, address);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200382 if (young)
383 kvm_flush_remote_tlbs(kvm);
384
Takuya Yoshikawa565f3be2012-02-10 15:28:31 +0900385 spin_unlock(&kvm->mmu_lock);
386 srcu_read_unlock(&kvm->srcu, idx);
387
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200388 return young;
389}
390
Andrea Arcangeli8ee53822011-01-13 15:47:10 -0800391static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
392 struct mm_struct *mm,
393 unsigned long address)
394{
395 struct kvm *kvm = mmu_notifier_to_kvm(mn);
396 int young, idx;
397
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);
403
404 return young;
405}
406
Marcelo Tosatti85db06e2008-12-10 21:23:26 +0100407static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
408 struct mm_struct *mm)
409{
410 struct kvm *kvm = mmu_notifier_to_kvm(mn);
Lai Jiangshaneda2bed2010-04-20 14:29:29 +0800411 int idx;
412
413 idx = srcu_read_lock(&kvm->srcu);
Marcelo Tosatti85db06e2008-12-10 21:23:26 +0100414 kvm_arch_flush_shadow(kvm);
Lai Jiangshaneda2bed2010-04-20 14:29:29 +0800415 srcu_read_unlock(&kvm->srcu, idx);
Marcelo Tosatti85db06e2008-12-10 21:23:26 +0100416}
417
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200418static 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,
Andrea Arcangeli8ee53822011-01-13 15:47:10 -0800423 .test_young = kvm_mmu_notifier_test_young,
Izik Eidus3da0dd42009-09-23 21:47:18 +0300424 .change_pte = kvm_mmu_notifier_change_pte,
Marcelo Tosatti85db06e2008-12-10 21:23:26 +0100425 .release = kvm_mmu_notifier_release,
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200426};
Avi Kivity4c07b0a2009-12-20 14:54:04 +0200427
428static int kvm_init_mmu_notifier(struct kvm *kvm)
429{
430 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
431 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
432}
433
434#else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
435
436static int kvm_init_mmu_notifier(struct kvm *kvm)
437{
438 return 0;
439}
440
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200441#endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
442
Xiao Guangrongbf3e05b2011-11-24 17:40:57 +0800443static void kvm_init_memslots_id(struct kvm *kvm)
444{
445 int i;
446 struct kvm_memslots *slots = kvm->memslots;
447
448 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
Xiao Guangrongf85e2cb2011-11-24 17:41:54 +0800449 slots->id_to_index[i] = slots->memslots[i].id = i;
Xiao Guangrongbf3e05b2011-11-24 17:40:57 +0800450}
451
Carsten Ottee08b9632012-01-04 10:25:20 +0100452static struct kvm *kvm_create_vm(unsigned long type)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800453{
Jan Kiszkad89f5ef2010-11-09 17:02:49 +0100454 int r, i;
455 struct kvm *kvm = kvm_arch_alloc_vm();
Avi Kivity6aa8b732006-12-10 02:21:36 -0800456
Jan Kiszkad89f5ef2010-11-09 17:02:49 +0100457 if (!kvm)
458 return ERR_PTR(-ENOMEM);
459
Carsten Ottee08b9632012-01-04 10:25:20 +0100460 r = kvm_arch_init_vm(kvm, type);
Jan Kiszkad89f5ef2010-11-09 17:02:49 +0100461 if (r)
462 goto out_err_nodisable;
Alexander Graf10474ae2009-09-15 11:37:46 +0200463
464 r = hardware_enable_all();
465 if (r)
466 goto out_err_nodisable;
467
Avi Kivity75858a82009-01-04 17:10:50 +0200468#ifdef CONFIG_HAVE_KVM_IRQCHIP
469 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
Gleb Natapov136bdfe2009-08-24 11:54:23 +0300470 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
Avi Kivity75858a82009-01-04 17:10:50 +0200471#endif
Avi Kivity6aa8b732006-12-10 02:21:36 -0800472
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200473 r = -ENOMEM;
474 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
475 if (!kvm->memslots)
Jan Kiszka57e7fbe2010-11-09 12:42:12 +0100476 goto out_err_nosrcu;
Xiao Guangrongbf3e05b2011-11-24 17:40:57 +0800477 kvm_init_memslots_id(kvm);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200478 if (init_srcu_struct(&kvm->srcu))
Jan Kiszka57e7fbe2010-11-09 12:42:12 +0100479 goto out_err_nosrcu;
Marcelo Tosattie93f8a02009-12-23 14:35:24 -0200480 for (i = 0; i < KVM_NR_BUSES; i++) {
481 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
482 GFP_KERNEL);
Jan Kiszka57e7fbe2010-11-09 12:42:12 +0100483 if (!kvm->buses[i])
Marcelo Tosattie93f8a02009-12-23 14:35:24 -0200484 goto out_err;
Marcelo Tosattie93f8a02009-12-23 14:35:24 -0200485 }
Mike Waychison74b5c5b2011-06-03 13:04:53 -0700486
OGAWA Hirofumi85722cd2011-05-11 09:28:28 +0900487 spin_lock_init(&kvm->mmu_lock);
Avi Kivity6d4e4c42007-11-21 16:41:05 +0200488 kvm->mm = current->mm;
489 atomic_inc(&kvm->mm->mm_count);
Gregory Haskinsd34e6b12009-07-07 17:08:49 -0400490 kvm_eventfd_init(kvm);
Shaohua Li11ec2802007-07-23 14:51:37 +0800491 mutex_init(&kvm->lock);
Marcelo Tosatti60eead72009-06-04 15:08:23 -0300492 mutex_init(&kvm->irq_lock);
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200493 mutex_init(&kvm->slots_lock);
Izik Eidusd39f13b2008-03-30 16:01:25 +0300494 atomic_set(&kvm->users_count, 1);
Mike Waychison74b5c5b2011-06-03 13:04:53 -0700495
496 r = kvm_init_mmu_notifier(kvm);
497 if (r)
498 goto out_err;
499
Jan Kiszkae935b832011-02-08 12:55:33 +0100500 raw_spin_lock(&kvm_lock);
Rusty Russell5e58cfe2007-07-23 17:08:21 +1000501 list_add(&kvm->vm_list, &vm_list);
Jan Kiszkae935b832011-02-08 12:55:33 +0100502 raw_spin_unlock(&kvm_lock);
Jan Kiszkad89f5ef2010-11-09 17:02:49 +0100503
Avi Kivityf17abe92007-02-21 19:28:04 +0200504 return kvm;
Alexander Graf10474ae2009-09-15 11:37:46 +0200505
506out_err:
Jan Kiszka57e7fbe2010-11-09 12:42:12 +0100507 cleanup_srcu_struct(&kvm->srcu);
508out_err_nosrcu:
Alexander Graf10474ae2009-09-15 11:37:46 +0200509 hardware_disable_all();
510out_err_nodisable:
Marcelo Tosattie93f8a02009-12-23 14:35:24 -0200511 for (i = 0; i < KVM_NR_BUSES; i++)
512 kfree(kvm->buses[i]);
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200513 kfree(kvm->memslots);
Jan Kiszkad89f5ef2010-11-09 17:02:49 +0100514 kvm_arch_free_vm(kvm);
Alexander Graf10474ae2009-09-15 11:37:46 +0200515 return ERR_PTR(r);
Avi Kivityf17abe92007-02-21 19:28:04 +0200516}
517
Takuya Yoshikawa92eca8f2012-05-20 13:13:28 +0900518/*
519 * Avoid using vmalloc for a small buffer.
520 * Should not be used when the size is statically known.
521 */
Takuya Yoshikawac1a7b322012-05-20 13:15:07 +0900522void *kvm_kvzalloc(unsigned long size)
Takuya Yoshikawa92eca8f2012-05-20 13:13:28 +0900523{
524 if (size > PAGE_SIZE)
525 return vzalloc(size);
526 else
527 return kzalloc(size, GFP_KERNEL);
528}
529
Takuya Yoshikawac1a7b322012-05-20 13:15:07 +0900530void kvm_kvfree(const void *addr)
Takuya Yoshikawa92eca8f2012-05-20 13:13:28 +0900531{
532 if (is_vmalloc_addr(addr))
533 vfree(addr);
534 else
535 kfree(addr);
536}
537
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900538static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
539{
540 if (!memslot->dirty_bitmap)
541 return;
542
Takuya Yoshikawa92eca8f2012-05-20 13:13:28 +0900543 kvm_kvfree(memslot->dirty_bitmap);
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900544 memslot->dirty_bitmap = NULL;
545}
546
Avi Kivity6aa8b732006-12-10 02:21:36 -0800547/*
548 * Free any memory in @free but not in @dont.
549 */
550static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
551 struct kvm_memory_slot *dont)
552{
Izik Eidus290fc382007-09-27 14:11:22 +0200553 if (!dont || free->rmap != dont->rmap)
554 vfree(free->rmap);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800555
556 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900557 kvm_destroy_dirty_bitmap(free);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800558
Takuya Yoshikawadb3fe4e2012-02-08 13:02:18 +0900559 kvm_arch_free_memslot(free, dont);
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300560
Avi Kivity6aa8b732006-12-10 02:21:36 -0800561 free->npages = 0;
Anthony Liguori8d4e1282007-10-18 09:59:34 -0500562 free->rmap = NULL;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800563}
564
Zhang Xiantaod19a9cd2007-11-18 18:43:45 +0800565void kvm_free_physmem(struct kvm *kvm)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800566{
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200567 struct kvm_memslots *slots = kvm->memslots;
Xiao Guangrongbe6ba0f2011-11-24 17:39:18 +0800568 struct kvm_memory_slot *memslot;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800569
Xiao Guangrongbe6ba0f2011-11-24 17:39:18 +0800570 kvm_for_each_memslot(memslot, slots)
571 kvm_free_physmem_slot(memslot, NULL);
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200572
573 kfree(kvm->memslots);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800574}
575
Avi Kivityf17abe92007-02-21 19:28:04 +0200576static void kvm_destroy_vm(struct kvm *kvm)
577{
Marcelo Tosattie93f8a02009-12-23 14:35:24 -0200578 int i;
Avi Kivity6d4e4c42007-11-21 16:41:05 +0200579 struct mm_struct *mm = kvm->mm;
580
Sheng Yangad8ba2c2009-01-06 10:03:02 +0800581 kvm_arch_sync_events(kvm);
Jan Kiszkae935b832011-02-08 12:55:33 +0100582 raw_spin_lock(&kvm_lock);
Avi Kivity133de902007-02-12 00:54:44 -0800583 list_del(&kvm->vm_list);
Jan Kiszkae935b832011-02-08 12:55:33 +0100584 raw_spin_unlock(&kvm_lock);
Avi Kivity399ec802008-11-19 13:58:46 +0200585 kvm_free_irq_routing(kvm);
Marcelo Tosattie93f8a02009-12-23 14:35:24 -0200586 for (i = 0; i < KVM_NR_BUSES; i++)
587 kvm_io_bus_destroy(kvm->buses[i]);
Avi Kivity980da6c2009-12-20 15:13:43 +0200588 kvm_coalesced_mmio_free(kvm);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200589#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
590 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
Gleb Natapovf00be0c2009-03-19 12:20:36 +0200591#else
592 kvm_arch_flush_shadow(kvm);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200593#endif
Zhang Xiantaod19a9cd2007-11-18 18:43:45 +0800594 kvm_arch_destroy_vm(kvm);
Jan Kiszkad89f5ef2010-11-09 17:02:49 +0100595 kvm_free_physmem(kvm);
596 cleanup_srcu_struct(&kvm->srcu);
597 kvm_arch_free_vm(kvm);
Alexander Graf10474ae2009-09-15 11:37:46 +0200598 hardware_disable_all();
Avi Kivity6d4e4c42007-11-21 16:41:05 +0200599 mmdrop(mm);
Avi Kivityf17abe92007-02-21 19:28:04 +0200600}
601
Izik Eidusd39f13b2008-03-30 16:01:25 +0300602void kvm_get_kvm(struct kvm *kvm)
603{
604 atomic_inc(&kvm->users_count);
605}
606EXPORT_SYMBOL_GPL(kvm_get_kvm);
607
608void kvm_put_kvm(struct kvm *kvm)
609{
610 if (atomic_dec_and_test(&kvm->users_count))
611 kvm_destroy_vm(kvm);
612}
613EXPORT_SYMBOL_GPL(kvm_put_kvm);
614
615
Avi Kivityf17abe92007-02-21 19:28:04 +0200616static int kvm_vm_release(struct inode *inode, struct file *filp)
617{
618 struct kvm *kvm = filp->private_data;
619
Gregory Haskins721eecbf2009-05-20 10:30:49 -0400620 kvm_irqfd_release(kvm);
621
Izik Eidusd39f13b2008-03-30 16:01:25 +0300622 kvm_put_kvm(kvm);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800623 return 0;
624}
625
Takuya Yoshikawa515a0122010-10-27 18:23:54 +0900626/*
627 * Allocation size is twice as large as the actual dirty bitmap size.
Takuya Yoshikawa93474b22012-03-01 19:34:45 +0900628 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
Takuya Yoshikawa515a0122010-10-27 18:23:54 +0900629 */
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900630static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
631{
Takuya Yoshikawa189a2f72012-02-08 13:01:09 +0900632#ifndef CONFIG_S390
Takuya Yoshikawa515a0122010-10-27 18:23:54 +0900633 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900634
Takuya Yoshikawa92eca8f2012-05-20 13:13:28 +0900635 memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900636 if (!memslot->dirty_bitmap)
637 return -ENOMEM;
638
Takuya Yoshikawa189a2f72012-02-08 13:01:09 +0900639#endif /* !CONFIG_S390 */
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900640 return 0;
641}
642
Xiao Guangrongbf3e05b2011-11-24 17:40:57 +0800643static int cmp_memslot(const void *slot1, const void *slot2)
644{
645 struct kvm_memory_slot *s1, *s2;
646
647 s1 = (struct kvm_memory_slot *)slot1;
648 s2 = (struct kvm_memory_slot *)slot2;
649
650 if (s1->npages < s2->npages)
651 return 1;
652 if (s1->npages > s2->npages)
653 return -1;
654
655 return 0;
656}
657
658/*
659 * Sort the memslots base on its size, so the larger slots
660 * will get better fit.
661 */
662static void sort_memslots(struct kvm_memslots *slots)
663{
Xiao Guangrongf85e2cb2011-11-24 17:41:54 +0800664 int i;
665
Xiao Guangrongbf3e05b2011-11-24 17:40:57 +0800666 sort(slots->memslots, KVM_MEM_SLOTS_NUM,
667 sizeof(struct kvm_memory_slot), cmp_memslot, NULL);
Xiao Guangrongf85e2cb2011-11-24 17:41:54 +0800668
669 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
670 slots->id_to_index[slots->memslots[i].id] = i;
Xiao Guangrongbf3e05b2011-11-24 17:40:57 +0800671}
672
Xiao Guangrongbe593d62011-11-24 17:38:24 +0800673void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new)
674{
675 if (new) {
676 int id = new->id;
Xiao Guangrong28a37542011-11-24 19:04:35 +0800677 struct kvm_memory_slot *old = id_to_memslot(slots, id);
Xiao Guangrongbf3e05b2011-11-24 17:40:57 +0800678 unsigned long npages = old->npages;
Xiao Guangrongbe593d62011-11-24 17:38:24 +0800679
Xiao Guangrong28a37542011-11-24 19:04:35 +0800680 *old = *new;
Xiao Guangrongbf3e05b2011-11-24 17:40:57 +0800681 if (new->npages != npages)
682 sort_memslots(slots);
Xiao Guangrongbe593d62011-11-24 17:38:24 +0800683 }
684
685 slots->generation++;
686}
687
Avi Kivity6aa8b732006-12-10 02:21:36 -0800688/*
Avi Kivity6aa8b732006-12-10 02:21:36 -0800689 * Allocate some memory and give it an address in the guest physical address
690 * space.
691 *
692 * Discontiguous memory is allowed, mostly for framebuffers.
Sheng Yangf78e0e22007-10-29 09:40:42 +0800693 *
Marcelo Tosatti10589a42007-12-20 19:18:22 -0500694 * Must be called holding mmap_sem for write.
Avi Kivity6aa8b732006-12-10 02:21:36 -0800695 */
Sheng Yangf78e0e22007-10-29 09:40:42 +0800696int __kvm_set_memory_region(struct kvm *kvm,
697 struct kvm_userspace_memory_region *mem,
698 int user_alloc)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800699{
Avi Kivity8234b222010-12-27 12:08:45 +0200700 int r;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800701 gfn_t base_gfn;
Heiko Carstens28bcb112009-09-03 17:35:35 +0200702 unsigned long npages;
703 unsigned long i;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800704 struct kvm_memory_slot *memslot;
705 struct kvm_memory_slot old, new;
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200706 struct kvm_memslots *slots, *old_memslots;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800707
708 r = -EINVAL;
709 /* General sanity checks */
710 if (mem->memory_size & (PAGE_SIZE - 1))
711 goto out;
712 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
713 goto out;
Takuya Yoshikawafa3d3152011-05-07 16:35:38 +0900714 /* We can read the guest memory with __xxx_user() later on. */
715 if (user_alloc &&
716 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
Heiko Carstens9e3bb6b2011-05-24 07:51:27 +0200717 !access_ok(VERIFY_WRITE,
718 (void __user *)(unsigned long)mem->userspace_addr,
719 mem->memory_size)))
Hollis Blanchard78749802008-11-07 13:32:12 -0600720 goto out;
Xiao Guangrong93a5cef2011-11-24 17:37:48 +0800721 if (mem->slot >= KVM_MEM_SLOTS_NUM)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800722 goto out;
723 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
724 goto out;
725
Xiao Guangrong28a37542011-11-24 19:04:35 +0800726 memslot = id_to_memslot(kvm->memslots, mem->slot);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800727 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
728 npages = mem->memory_size >> PAGE_SHIFT;
729
Takuya Yoshikawa660c22c2010-04-13 22:47:24 +0900730 r = -EINVAL;
731 if (npages > KVM_MEM_MAX_NR_PAGES)
732 goto out;
733
Avi Kivity6aa8b732006-12-10 02:21:36 -0800734 if (!npages)
735 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
736
Avi Kivity6aa8b732006-12-10 02:21:36 -0800737 new = old = *memslot;
738
Avi Kivitye36d96f2010-06-21 10:56:36 +0300739 new.id = mem->slot;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800740 new.base_gfn = base_gfn;
741 new.npages = npages;
742 new.flags = mem->flags;
743
744 /* Disallow changing a memory slot's size. */
745 r = -EINVAL;
746 if (npages && old.npages && npages != old.npages)
Sheng Yangf78e0e22007-10-29 09:40:42 +0800747 goto out_free;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800748
749 /* Check for overlaps */
750 r = -EEXIST;
751 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200752 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
Avi Kivity6aa8b732006-12-10 02:21:36 -0800753
Jan Kiszka4cd481f2009-04-13 11:59:32 +0200754 if (s == memslot || !s->npages)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800755 continue;
756 if (!((base_gfn + npages <= s->base_gfn) ||
757 (base_gfn >= s->base_gfn + s->npages)))
Sheng Yangf78e0e22007-10-29 09:40:42 +0800758 goto out_free;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800759 }
Avi Kivity6aa8b732006-12-10 02:21:36 -0800760
Avi Kivity6aa8b732006-12-10 02:21:36 -0800761 /* Free page dirty bitmap if unneeded */
762 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
Al Viro8b6d44c2007-02-09 16:38:40 +0000763 new.dirty_bitmap = NULL;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800764
765 r = -ENOMEM;
766
767 /* Allocate if a slot is being created */
Takuya Yoshikawa189a2f72012-02-08 13:01:09 +0900768 if (npages && !old.npages) {
769 new.user_alloc = user_alloc;
770 new.userspace_addr = mem->userspace_addr;
Carsten Otteeff01142008-06-27 15:05:31 +0200771#ifndef CONFIG_S390
Takuya Yoshikawa26535032010-11-02 10:49:34 +0900772 new.rmap = vzalloc(npages * sizeof(*new.rmap));
Izik Eidus290fc382007-09-27 14:11:22 +0200773 if (!new.rmap)
Sheng Yangf78e0e22007-10-29 09:40:42 +0800774 goto out_free;
Takuya Yoshikawa189a2f72012-02-08 13:01:09 +0900775#endif /* not defined CONFIG_S390 */
Takuya Yoshikawadb3fe4e2012-02-08 13:02:18 +0900776 if (kvm_arch_create_memslot(&new, npages))
777 goto out_free;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800778 }
Joerg Roedelec04b262009-06-19 15:16:23 +0200779
Avi Kivity6aa8b732006-12-10 02:21:36 -0800780 /* Allocate page dirty bitmap if needed */
781 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900782 if (kvm_create_dirty_bitmap(&new) < 0)
Sheng Yangf78e0e22007-10-29 09:40:42 +0800783 goto out_free;
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200784 /* destroy any largepage mappings for dirty tracking */
Avi Kivity6aa8b732006-12-10 02:21:36 -0800785 }
786
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200787 if (!npages) {
Xiao Guangrong28a37542011-11-24 19:04:35 +0800788 struct kvm_memory_slot *slot;
789
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200790 r = -ENOMEM;
Thomas Meyer6da64fd2011-11-08 20:32:19 +0100791 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
792 GFP_KERNEL);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200793 if (!slots)
794 goto out_free;
Xiao Guangrong28a37542011-11-24 19:04:35 +0800795 slot = id_to_memslot(slots, mem->slot);
796 slot->flags |= KVM_MEMSLOT_INVALID;
797
Xiao Guangrongbe593d62011-11-24 17:38:24 +0800798 update_memslots(slots, NULL);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200799
800 old_memslots = kvm->memslots;
801 rcu_assign_pointer(kvm->memslots, slots);
802 synchronize_srcu_expedited(&kvm->srcu);
803 /* From this point no new shadow pages pointing to a deleted
804 * memslot will be created.
805 *
806 * validation of sp->gfn happens in:
807 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
808 * - kvm_is_visible_gfn (mmu_check_roots)
809 */
Marcelo Tosatti34d4cb82008-07-10 20:49:31 -0300810 kvm_arch_flush_shadow(kvm);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200811 kfree(old_memslots);
812 }
Marcelo Tosatti34d4cb82008-07-10 20:49:31 -0300813
Marcelo Tosattif7784b82009-12-23 14:35:18 -0200814 r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
815 if (r)
816 goto out_free;
817
Alex Williamson32f6daa2012-04-11 09:51:49 -0600818 /* map/unmap the pages in iommu page table */
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200819 if (npages) {
820 r = kvm_iommu_map_pages(kvm, &new);
821 if (r)
822 goto out_free;
Alex Williamson32f6daa2012-04-11 09:51:49 -0600823 } else
824 kvm_iommu_unmap_pages(kvm, &old);
Andrea Arcangeli604b38a2008-07-25 16:32:03 +0200825
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200826 r = -ENOMEM;
Thomas Meyer6da64fd2011-11-08 20:32:19 +0100827 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
828 GFP_KERNEL);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200829 if (!slots)
830 goto out_free;
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200831
832 /* actual memory is freed via old in kvm_free_physmem_slot below */
833 if (!npages) {
834 new.rmap = NULL;
835 new.dirty_bitmap = NULL;
Takuya Yoshikawadb3fe4e2012-02-08 13:02:18 +0900836 memset(&new.arch, 0, sizeof(new.arch));
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200837 }
838
Xiao Guangrongbe593d62011-11-24 17:38:24 +0800839 update_memslots(slots, &new);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200840 old_memslots = kvm->memslots;
841 rcu_assign_pointer(kvm->memslots, slots);
842 synchronize_srcu_expedited(&kvm->srcu);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800843
Marcelo Tosattif7784b82009-12-23 14:35:18 -0200844 kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
Zhang Xiantao3ad82a72007-11-20 13:11:38 +0800845
Xiao Guangrongce88dec2011-07-12 03:33:44 +0800846 /*
847 * If the new memory slot is created, we need to clear all
848 * mmio sptes.
849 */
850 if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT)
851 kvm_arch_flush_shadow(kvm);
852
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200853 kvm_free_physmem_slot(&old, &new);
854 kfree(old_memslots);
855
Avi Kivity6aa8b732006-12-10 02:21:36 -0800856 return 0;
857
Sheng Yangf78e0e22007-10-29 09:40:42 +0800858out_free:
Avi Kivity6aa8b732006-12-10 02:21:36 -0800859 kvm_free_physmem_slot(&new, &old);
860out:
861 return r;
Izik Eidus210c7c42007-10-24 23:52:57 +0200862
863}
Sheng Yangf78e0e22007-10-29 09:40:42 +0800864EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
865
866int kvm_set_memory_region(struct kvm *kvm,
867 struct kvm_userspace_memory_region *mem,
868 int user_alloc)
869{
870 int r;
871
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200872 mutex_lock(&kvm->slots_lock);
Sheng Yangf78e0e22007-10-29 09:40:42 +0800873 r = __kvm_set_memory_region(kvm, mem, user_alloc);
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200874 mutex_unlock(&kvm->slots_lock);
Sheng Yangf78e0e22007-10-29 09:40:42 +0800875 return r;
876}
Izik Eidus210c7c42007-10-24 23:52:57 +0200877EXPORT_SYMBOL_GPL(kvm_set_memory_region);
878
Carsten Otte1fe779f2007-10-29 16:08:35 +0100879int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
880 struct
881 kvm_userspace_memory_region *mem,
882 int user_alloc)
Izik Eidus210c7c42007-10-24 23:52:57 +0200883{
Izik Eiduse0d62c72007-10-24 23:57:46 +0200884 if (mem->slot >= KVM_MEMORY_SLOTS)
885 return -EINVAL;
Izik Eidus210c7c42007-10-24 23:52:57 +0200886 return kvm_set_memory_region(kvm, mem, user_alloc);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800887}
888
Zhang Xiantao5bb064d2007-11-18 20:29:43 +0800889int kvm_get_dirty_log(struct kvm *kvm,
890 struct kvm_dirty_log *log, int *is_dirty)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800891{
892 struct kvm_memory_slot *memslot;
893 int r, i;
Takuya Yoshikawa87bf6e72010-04-12 19:35:35 +0900894 unsigned long n;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800895 unsigned long any = 0;
896
Avi Kivity6aa8b732006-12-10 02:21:36 -0800897 r = -EINVAL;
898 if (log->slot >= KVM_MEMORY_SLOTS)
899 goto out;
900
Xiao Guangrong28a37542011-11-24 19:04:35 +0800901 memslot = id_to_memslot(kvm->memslots, log->slot);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800902 r = -ENOENT;
903 if (!memslot->dirty_bitmap)
904 goto out;
905
Takuya Yoshikawa87bf6e72010-04-12 19:35:35 +0900906 n = kvm_dirty_bitmap_bytes(memslot);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800907
Uri Lublincd1a4a92007-02-22 16:43:09 +0200908 for (i = 0; !any && i < n/sizeof(long); ++i)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800909 any = memslot->dirty_bitmap[i];
910
911 r = -EFAULT;
912 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
913 goto out;
914
Zhang Xiantao5bb064d2007-11-18 20:29:43 +0800915 if (any)
916 *is_dirty = 1;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800917
918 r = 0;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800919out:
Avi Kivity6aa8b732006-12-10 02:21:36 -0800920 return r;
921}
922
Takuya Yoshikawadb3fe4e2012-02-08 13:02:18 +0900923bool kvm_largepages_enabled(void)
924{
925 return largepages_enabled;
926}
927
Marcelo Tosatti54dee992009-06-11 12:07:44 -0300928void kvm_disable_largepages(void)
929{
930 largepages_enabled = false;
931}
932EXPORT_SYMBOL_GPL(kvm_disable_largepages);
933
Izik Eiduscea7bb22007-10-17 19:17:48 +0200934int is_error_page(struct page *page)
935{
Gleb Natapovedba23e2010-07-07 20:16:45 +0300936 return page == bad_page || page == hwpoison_page || page == fault_page;
Izik Eiduscea7bb22007-10-17 19:17:48 +0200937}
938EXPORT_SYMBOL_GPL(is_error_page);
939
Anthony Liguori35149e22008-04-02 14:46:56 -0500940int is_error_pfn(pfn_t pfn)
941{
Gleb Natapovedba23e2010-07-07 20:16:45 +0300942 return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn;
Anthony Liguori35149e22008-04-02 14:46:56 -0500943}
944EXPORT_SYMBOL_GPL(is_error_pfn);
945
Huang Yingbf998152010-05-31 14:28:19 +0800946int is_hwpoison_pfn(pfn_t pfn)
947{
948 return pfn == hwpoison_pfn;
949}
950EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
951
Xiao Guangrongfce92dc2011-07-12 03:28:54 +0800952int is_noslot_pfn(pfn_t pfn)
953{
954 return pfn == bad_pfn;
955}
956EXPORT_SYMBOL_GPL(is_noslot_pfn);
957
958int is_invalid_pfn(pfn_t pfn)
959{
960 return pfn == hwpoison_pfn || pfn == fault_pfn;
961}
962EXPORT_SYMBOL_GPL(is_invalid_pfn);
963
Izik Eidusf9d46eb2007-11-11 22:02:22 +0200964static inline unsigned long bad_hva(void)
965{
966 return PAGE_OFFSET;
967}
968
969int kvm_is_error_hva(unsigned long addr)
970{
971 return addr == bad_hva();
972}
973EXPORT_SYMBOL_GPL(kvm_is_error_hva);
974
Gleb Natapov49c77542010-10-18 15:22:23 +0200975struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
976{
977 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
978}
Avi Kivitya1f4d3952010-06-21 11:44:20 +0300979EXPORT_SYMBOL_GPL(gfn_to_memslot);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800980
Izik Eiduse0d62c72007-10-24 23:57:46 +0200981int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
982{
Xiao Guangrongbf3e05b2011-11-24 17:40:57 +0800983 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
Izik Eiduse0d62c72007-10-24 23:57:46 +0200984
Xiao Guangrongbf3e05b2011-11-24 17:40:57 +0800985 if (!memslot || memslot->id >= KVM_MEMORY_SLOTS ||
986 memslot->flags & KVM_MEMSLOT_INVALID)
987 return 0;
Izik Eiduse0d62c72007-10-24 23:57:46 +0200988
Xiao Guangrongbf3e05b2011-11-24 17:40:57 +0800989 return 1;
Izik Eiduse0d62c72007-10-24 23:57:46 +0200990}
991EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
992
Joerg Roedel8f0b1ab2010-01-28 12:37:56 +0100993unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
994{
995 struct vm_area_struct *vma;
996 unsigned long addr, size;
997
998 size = PAGE_SIZE;
999
1000 addr = gfn_to_hva(kvm, gfn);
1001 if (kvm_is_error_hva(addr))
1002 return PAGE_SIZE;
1003
1004 down_read(&current->mm->mmap_sem);
1005 vma = find_vma(current->mm, addr);
1006 if (!vma)
1007 goto out;
1008
1009 size = vma_kernel_pagesize(vma);
1010
1011out:
1012 up_read(&current->mm->mmap_sem);
1013
1014 return size;
1015}
1016
Gleb Natapov49c77542010-10-18 15:22:23 +02001017static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
Xiao Guangrong48987782010-08-22 19:11:43 +08001018 gfn_t *nr_pages)
Izik Eidus539cb662007-11-11 22:05:04 +02001019{
Marcelo Tosattibc6678a2009-12-23 14:35:21 -02001020 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
Izik Eidus539cb662007-11-11 22:05:04 +02001021 return bad_hva();
Xiao Guangrong48987782010-08-22 19:11:43 +08001022
1023 if (nr_pages)
1024 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1025
Takuya Yoshikawaf5c98032010-02-25 11:33:19 +09001026 return gfn_to_hva_memslot(slot, gfn);
Izik Eidus539cb662007-11-11 22:05:04 +02001027}
Xiao Guangrong48987782010-08-22 19:11:43 +08001028
1029unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1030{
Gleb Natapov49c77542010-10-18 15:22:23 +02001031 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
Xiao Guangrong48987782010-08-22 19:11:43 +08001032}
Sheng Yang0d150292008-04-25 21:44:50 +08001033EXPORT_SYMBOL_GPL(gfn_to_hva);
Izik Eidus539cb662007-11-11 22:05:04 +02001034
Xiao Guangrong903816f2012-07-17 21:54:11 +08001035pfn_t get_fault_pfn(void)
Gleb Natapov80300892010-10-19 18:13:41 +02001036{
1037 get_page(fault_page);
1038 return fault_pfn;
1039}
Xiao Guangrong903816f2012-07-17 21:54:11 +08001040EXPORT_SYMBOL_GPL(get_fault_pfn);
Gleb Natapov80300892010-10-19 18:13:41 +02001041
Gleb Natapov0857b9e2011-02-01 13:21:47 +02001042int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1043 unsigned long start, int write, struct page **page)
1044{
1045 int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1046
1047 if (write)
1048 flags |= FOLL_WRITE;
1049
1050 return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1051}
1052
Huang Yingfafc3db2011-01-30 11:15:49 +08001053static inline int check_user_page_hwpoison(unsigned long addr)
1054{
1055 int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1056
1057 rc = __get_user_pages(current, current->mm, addr, 1,
1058 flags, NULL, NULL, NULL);
1059 return rc == -EHWPOISON;
1060}
1061
Gleb Natapovaf585b92010-10-14 11:22:46 +02001062static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001063 bool *async, bool write_fault, bool *writable)
Avi Kivity954bbbc2007-03-30 14:02:32 +03001064{
Anthony Liguori8d4e1282007-10-18 09:59:34 -05001065 struct page *page[1];
Gleb Natapovaf585b92010-10-14 11:22:46 +02001066 int npages = 0;
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001067 pfn_t pfn;
Avi Kivity954bbbc2007-03-30 14:02:32 +03001068
Gleb Natapovaf585b92010-10-14 11:22:46 +02001069 /* we can do it either atomically or asynchronously, not both */
1070 BUG_ON(atomic && async);
1071
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001072 BUG_ON(!write_fault && !writable);
1073
1074 if (writable)
1075 *writable = true;
1076
Gleb Natapovaf585b92010-10-14 11:22:46 +02001077 if (atomic || async)
Xiao Guangrong887c08a2010-08-22 19:10:28 +08001078 npages = __get_user_pages_fast(addr, 1, 1, page);
Gleb Natapovaf585b92010-10-14 11:22:46 +02001079
1080 if (unlikely(npages != 1) && !atomic) {
Xiao Guangrong887c08a2010-08-22 19:10:28 +08001081 might_sleep();
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001082
1083 if (writable)
1084 *writable = write_fault;
1085
Gleb Natapov0857b9e2011-02-01 13:21:47 +02001086 if (async) {
1087 down_read(&current->mm->mmap_sem);
1088 npages = get_user_page_nowait(current, current->mm,
1089 addr, write_fault, page);
1090 up_read(&current->mm->mmap_sem);
1091 } else
1092 npages = get_user_pages_fast(addr, 1, write_fault,
1093 page);
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001094
1095 /* map read fault as writable if possible */
1096 if (unlikely(!write_fault) && npages == 1) {
1097 struct page *wpage[1];
1098
1099 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1100 if (npages == 1) {
1101 *writable = true;
1102 put_page(page[0]);
1103 page[0] = wpage[0];
1104 }
1105 npages = 1;
1106 }
Xiao Guangrong887c08a2010-08-22 19:10:28 +08001107 }
Izik Eidus539cb662007-11-11 22:05:04 +02001108
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001109 if (unlikely(npages != 1)) {
1110 struct vm_area_struct *vma;
Anthony Liguori8d4e1282007-10-18 09:59:34 -05001111
Xiao Guangrong887c08a2010-08-22 19:10:28 +08001112 if (atomic)
Gleb Natapov80300892010-10-19 18:13:41 +02001113 return get_fault_pfn();
Xiao Guangrong887c08a2010-08-22 19:10:28 +08001114
Huang Yingbbeb3402010-06-22 14:23:11 +08001115 down_read(&current->mm->mmap_sem);
Gleb Natapov0857b9e2011-02-01 13:21:47 +02001116 if (npages == -EHWPOISON ||
1117 (!async && check_user_page_hwpoison(addr))) {
Huang Yingbbeb3402010-06-22 14:23:11 +08001118 up_read(&current->mm->mmap_sem);
Huang Yingbf998152010-05-31 14:28:19 +08001119 get_page(hwpoison_page);
1120 return page_to_pfn(hwpoison_page);
1121 }
1122
Gleb Natapov80300892010-10-19 18:13:41 +02001123 vma = find_vma_intersection(current->mm, addr, addr+1);
Marcelo Tosatti4c2155c2008-09-16 20:54:47 -03001124
Gleb Natapov80300892010-10-19 18:13:41 +02001125 if (vma == NULL)
1126 pfn = get_fault_pfn();
1127 else if ((vma->vm_flags & VM_PFNMAP)) {
1128 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1129 vma->vm_pgoff;
1130 BUG_ON(!kvm_is_mmio_pfn(pfn));
1131 } else {
1132 if (async && (vma->vm_flags & VM_WRITE))
Gleb Natapovaf585b92010-10-14 11:22:46 +02001133 *async = true;
Gleb Natapov80300892010-10-19 18:13:41 +02001134 pfn = get_fault_pfn();
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001135 }
Marcelo Tosatti4c2155c2008-09-16 20:54:47 -03001136 up_read(&current->mm->mmap_sem);
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001137 } else
1138 pfn = page_to_pfn(page[0]);
1139
1140 return pfn;
Anthony Liguori35149e22008-04-02 14:46:56 -05001141}
1142
Xiao Guangrong887c08a2010-08-22 19:10:28 +08001143pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr)
1144{
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001145 return hva_to_pfn(kvm, addr, true, NULL, true, NULL);
Xiao Guangrong887c08a2010-08-22 19:10:28 +08001146}
1147EXPORT_SYMBOL_GPL(hva_to_pfn_atomic);
1148
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001149static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1150 bool write_fault, bool *writable)
Marcelo Tosatti506f0d62009-12-23 14:35:19 -02001151{
1152 unsigned long addr;
1153
Gleb Natapovaf585b92010-10-14 11:22:46 +02001154 if (async)
1155 *async = false;
1156
Marcelo Tosatti506f0d62009-12-23 14:35:19 -02001157 addr = gfn_to_hva(kvm, gfn);
1158 if (kvm_is_error_hva(addr)) {
1159 get_page(bad_page);
1160 return page_to_pfn(bad_page);
1161 }
1162
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001163 return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable);
Xiao Guangrong365fb3f2010-08-28 19:24:13 +08001164}
1165
1166pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1167{
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001168 return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
Xiao Guangrong365fb3f2010-08-28 19:24:13 +08001169}
1170EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1171
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001172pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1173 bool write_fault, bool *writable)
Gleb Natapovaf585b92010-10-14 11:22:46 +02001174{
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001175 return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
Gleb Natapovaf585b92010-10-14 11:22:46 +02001176}
1177EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1178
Xiao Guangrong365fb3f2010-08-28 19:24:13 +08001179pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1180{
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001181 return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
Marcelo Tosatti506f0d62009-12-23 14:35:19 -02001182}
Anthony Liguori35149e22008-04-02 14:46:56 -05001183EXPORT_SYMBOL_GPL(gfn_to_pfn);
1184
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001185pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1186 bool *writable)
1187{
1188 return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1189}
1190EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1191
Marcelo Tosatti506f0d62009-12-23 14:35:19 -02001192pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
1193 struct kvm_memory_slot *slot, gfn_t gfn)
1194{
1195 unsigned long addr = gfn_to_hva_memslot(slot, gfn);
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001196 return hva_to_pfn(kvm, addr, false, NULL, true, NULL);
Marcelo Tosatti506f0d62009-12-23 14:35:19 -02001197}
1198
Xiao Guangrong48987782010-08-22 19:11:43 +08001199int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1200 int nr_pages)
1201{
1202 unsigned long addr;
1203 gfn_t entry;
1204
Gleb Natapov49c77542010-10-18 15:22:23 +02001205 addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
Xiao Guangrong48987782010-08-22 19:11:43 +08001206 if (kvm_is_error_hva(addr))
1207 return -1;
1208
1209 if (entry < nr_pages)
1210 return 0;
1211
1212 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1213}
1214EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1215
Anthony Liguori35149e22008-04-02 14:46:56 -05001216struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1217{
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001218 pfn_t pfn;
1219
1220 pfn = gfn_to_pfn(kvm, gfn);
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001221 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001222 return pfn_to_page(pfn);
1223
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001224 WARN_ON(kvm_is_mmio_pfn(pfn));
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001225
1226 get_page(bad_page);
1227 return bad_page;
Avi Kivity954bbbc2007-03-30 14:02:32 +03001228}
Anthony Liguoriaab61cc2007-10-29 15:15:20 -05001229
Avi Kivity954bbbc2007-03-30 14:02:32 +03001230EXPORT_SYMBOL_GPL(gfn_to_page);
1231
Izik Eidusb4231d62007-11-20 11:49:33 +02001232void kvm_release_page_clean(struct page *page)
1233{
Anthony Liguori35149e22008-04-02 14:46:56 -05001234 kvm_release_pfn_clean(page_to_pfn(page));
Izik Eidusb4231d62007-11-20 11:49:33 +02001235}
1236EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1237
Anthony Liguori35149e22008-04-02 14:46:56 -05001238void kvm_release_pfn_clean(pfn_t pfn)
1239{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001240 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001241 put_page(pfn_to_page(pfn));
Anthony Liguori35149e22008-04-02 14:46:56 -05001242}
1243EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1244
Izik Eidusb4231d62007-11-20 11:49:33 +02001245void kvm_release_page_dirty(struct page *page)
Izik Eidus8a7ae052007-10-18 11:09:33 +02001246{
Anthony Liguori35149e22008-04-02 14:46:56 -05001247 kvm_release_pfn_dirty(page_to_pfn(page));
Izik Eidus8a7ae052007-10-18 11:09:33 +02001248}
Izik Eidusb4231d62007-11-20 11:49:33 +02001249EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
Izik Eidus8a7ae052007-10-18 11:09:33 +02001250
Anthony Liguori35149e22008-04-02 14:46:56 -05001251void kvm_release_pfn_dirty(pfn_t pfn)
1252{
1253 kvm_set_pfn_dirty(pfn);
1254 kvm_release_pfn_clean(pfn);
1255}
1256EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1257
1258void kvm_set_page_dirty(struct page *page)
1259{
1260 kvm_set_pfn_dirty(page_to_pfn(page));
1261}
1262EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1263
1264void kvm_set_pfn_dirty(pfn_t pfn)
1265{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001266 if (!kvm_is_mmio_pfn(pfn)) {
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001267 struct page *page = pfn_to_page(pfn);
1268 if (!PageReserved(page))
1269 SetPageDirty(page);
1270 }
Anthony Liguori35149e22008-04-02 14:46:56 -05001271}
1272EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1273
1274void kvm_set_pfn_accessed(pfn_t pfn)
1275{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001276 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001277 mark_page_accessed(pfn_to_page(pfn));
Anthony Liguori35149e22008-04-02 14:46:56 -05001278}
1279EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1280
1281void kvm_get_pfn(pfn_t pfn)
1282{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001283 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001284 get_page(pfn_to_page(pfn));
Anthony Liguori35149e22008-04-02 14:46:56 -05001285}
1286EXPORT_SYMBOL_GPL(kvm_get_pfn);
1287
Izik Eidus195aefd2007-10-01 22:14:18 +02001288static int next_segment(unsigned long len, int offset)
1289{
1290 if (len > PAGE_SIZE - offset)
1291 return PAGE_SIZE - offset;
1292 else
1293 return len;
1294}
1295
1296int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1297 int len)
1298{
Izik Eiduse0506bc2007-11-11 22:10:22 +02001299 int r;
1300 unsigned long addr;
Izik Eidus195aefd2007-10-01 22:14:18 +02001301
Izik Eiduse0506bc2007-11-11 22:10:22 +02001302 addr = gfn_to_hva(kvm, gfn);
1303 if (kvm_is_error_hva(addr))
Izik Eidus195aefd2007-10-01 22:14:18 +02001304 return -EFAULT;
Takuya Yoshikawafa3d3152011-05-07 16:35:38 +09001305 r = __copy_from_user(data, (void __user *)addr + offset, len);
Izik Eiduse0506bc2007-11-11 22:10:22 +02001306 if (r)
1307 return -EFAULT;
Izik Eidus195aefd2007-10-01 22:14:18 +02001308 return 0;
1309}
1310EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1311
1312int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1313{
1314 gfn_t gfn = gpa >> PAGE_SHIFT;
1315 int seg;
1316 int offset = offset_in_page(gpa);
1317 int ret;
1318
1319 while ((seg = next_segment(len, offset)) != 0) {
1320 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1321 if (ret < 0)
1322 return ret;
1323 offset = 0;
1324 len -= seg;
1325 data += seg;
1326 ++gfn;
1327 }
1328 return 0;
1329}
1330EXPORT_SYMBOL_GPL(kvm_read_guest);
1331
Marcelo Tosatti7ec54582007-12-20 19:18:23 -05001332int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1333 unsigned long len)
1334{
1335 int r;
1336 unsigned long addr;
1337 gfn_t gfn = gpa >> PAGE_SHIFT;
1338 int offset = offset_in_page(gpa);
1339
1340 addr = gfn_to_hva(kvm, gfn);
1341 if (kvm_is_error_hva(addr))
1342 return -EFAULT;
Andrea Arcangeli0aac03f2008-01-30 19:57:35 +01001343 pagefault_disable();
Marcelo Tosatti7ec54582007-12-20 19:18:23 -05001344 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
Andrea Arcangeli0aac03f2008-01-30 19:57:35 +01001345 pagefault_enable();
Marcelo Tosatti7ec54582007-12-20 19:18:23 -05001346 if (r)
1347 return -EFAULT;
1348 return 0;
1349}
1350EXPORT_SYMBOL(kvm_read_guest_atomic);
1351
Izik Eidus195aefd2007-10-01 22:14:18 +02001352int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1353 int offset, int len)
1354{
Izik Eiduse0506bc2007-11-11 22:10:22 +02001355 int r;
1356 unsigned long addr;
Izik Eidus195aefd2007-10-01 22:14:18 +02001357
Izik Eiduse0506bc2007-11-11 22:10:22 +02001358 addr = gfn_to_hva(kvm, gfn);
1359 if (kvm_is_error_hva(addr))
Izik Eidus195aefd2007-10-01 22:14:18 +02001360 return -EFAULT;
Xiao Guangrong8b0cedf2011-05-15 23:22:04 +08001361 r = __copy_to_user((void __user *)addr + offset, data, len);
Izik Eiduse0506bc2007-11-11 22:10:22 +02001362 if (r)
1363 return -EFAULT;
Izik Eidus195aefd2007-10-01 22:14:18 +02001364 mark_page_dirty(kvm, gfn);
1365 return 0;
1366}
1367EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1368
1369int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1370 unsigned long len)
1371{
1372 gfn_t gfn = gpa >> PAGE_SHIFT;
1373 int seg;
1374 int offset = offset_in_page(gpa);
1375 int ret;
1376
1377 while ((seg = next_segment(len, offset)) != 0) {
1378 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1379 if (ret < 0)
1380 return ret;
1381 offset = 0;
1382 len -= seg;
1383 data += seg;
1384 ++gfn;
1385 }
1386 return 0;
1387}
1388
Gleb Natapov49c77542010-10-18 15:22:23 +02001389int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1390 gpa_t gpa)
1391{
1392 struct kvm_memslots *slots = kvm_memslots(kvm);
1393 int offset = offset_in_page(gpa);
1394 gfn_t gfn = gpa >> PAGE_SHIFT;
1395
1396 ghc->gpa = gpa;
1397 ghc->generation = slots->generation;
Paul Mackerras9d4cba72012-01-12 20:09:51 +00001398 ghc->memslot = gfn_to_memslot(kvm, gfn);
Gleb Natapov49c77542010-10-18 15:22:23 +02001399 ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
1400 if (!kvm_is_error_hva(ghc->hva))
1401 ghc->hva += offset;
1402 else
1403 return -EFAULT;
1404
1405 return 0;
1406}
1407EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1408
1409int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1410 void *data, unsigned long len)
1411{
1412 struct kvm_memslots *slots = kvm_memslots(kvm);
1413 int r;
1414
1415 if (slots->generation != ghc->generation)
1416 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1417
1418 if (kvm_is_error_hva(ghc->hva))
1419 return -EFAULT;
1420
Xiao Guangrong8b0cedf2011-05-15 23:22:04 +08001421 r = __copy_to_user((void __user *)ghc->hva, data, len);
Gleb Natapov49c77542010-10-18 15:22:23 +02001422 if (r)
1423 return -EFAULT;
1424 mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1425
1426 return 0;
1427}
1428EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1429
Gleb Natapove03b6442011-07-11 15:28:11 -04001430int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1431 void *data, unsigned long len)
1432{
1433 struct kvm_memslots *slots = kvm_memslots(kvm);
1434 int r;
1435
1436 if (slots->generation != ghc->generation)
1437 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1438
1439 if (kvm_is_error_hva(ghc->hva))
1440 return -EFAULT;
1441
1442 r = __copy_from_user(data, (void __user *)ghc->hva, len);
1443 if (r)
1444 return -EFAULT;
1445
1446 return 0;
1447}
1448EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1449
Izik Eidus195aefd2007-10-01 22:14:18 +02001450int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1451{
Heiko Carstens3bcc8a82010-10-27 17:21:21 +02001452 return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1453 offset, len);
Izik Eidus195aefd2007-10-01 22:14:18 +02001454}
1455EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1456
1457int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1458{
1459 gfn_t gfn = gpa >> PAGE_SHIFT;
1460 int seg;
1461 int offset = offset_in_page(gpa);
1462 int ret;
1463
1464 while ((seg = next_segment(len, offset)) != 0) {
1465 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1466 if (ret < 0)
1467 return ret;
1468 offset = 0;
1469 len -= seg;
1470 ++gfn;
1471 }
1472 return 0;
1473}
1474EXPORT_SYMBOL_GPL(kvm_clear_guest);
1475
Gleb Natapov49c77542010-10-18 15:22:23 +02001476void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1477 gfn_t gfn)
Avi Kivity6aa8b732006-12-10 02:21:36 -08001478{
Rusty Russell7e9d6192007-07-31 20:41:14 +10001479 if (memslot && memslot->dirty_bitmap) {
1480 unsigned long rel_gfn = gfn - memslot->base_gfn;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001481
Takuya Yoshikawa93474b22012-03-01 19:34:45 +09001482 /* TODO: introduce set_bit_le() and use it */
1483 test_and_set_bit_le(rel_gfn, memslot->dirty_bitmap);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001484 }
1485}
1486
Gleb Natapov49c77542010-10-18 15:22:23 +02001487void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1488{
1489 struct kvm_memory_slot *memslot;
1490
1491 memslot = gfn_to_memslot(kvm, gfn);
1492 mark_page_dirty_in_slot(kvm, memslot, gfn);
1493}
1494
Eddie Dongb6958ce2007-07-18 12:15:21 +03001495/*
1496 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1497 */
Hollis Blanchard8776e512007-10-31 17:24:24 -05001498void kvm_vcpu_block(struct kvm_vcpu *vcpu)
Eddie Dongb6958ce2007-07-18 12:15:21 +03001499{
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001500 DEFINE_WAIT(wait);
Eddie Dongb6958ce2007-07-18 12:15:21 +03001501
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001502 for (;;) {
1503 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
Eddie Dongb6958ce2007-07-18 12:15:21 +03001504
Gleb Natapova1b37102009-07-09 15:33:52 +03001505 if (kvm_arch_vcpu_runnable(vcpu)) {
Avi Kivitya8eeb042010-05-10 12:34:53 +03001506 kvm_make_request(KVM_REQ_UNHALT, vcpu);
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001507 break;
Marcelo Tosattid7690172008-09-08 15:23:48 -03001508 }
Gleb Natapov09cec752009-03-23 15:11:44 +02001509 if (kvm_cpu_has_pending_timer(vcpu))
1510 break;
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001511 if (signal_pending(current))
1512 break;
1513
Eddie Dongb6958ce2007-07-18 12:15:21 +03001514 schedule();
Eddie Dongb6958ce2007-07-18 12:15:21 +03001515 }
1516
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001517 finish_wait(&vcpu->wq, &wait);
Eddie Dongb6958ce2007-07-18 12:15:21 +03001518}
1519
Marcelo Tosatti8c847802012-03-14 17:58:48 -03001520#ifndef CONFIG_S390
Christoffer Dallb6d33832012-03-08 16:44:24 -05001521/*
1522 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1523 */
1524void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
1525{
1526 int me;
1527 int cpu = vcpu->cpu;
1528 wait_queue_head_t *wqp;
1529
1530 wqp = kvm_arch_vcpu_wq(vcpu);
1531 if (waitqueue_active(wqp)) {
1532 wake_up_interruptible(wqp);
1533 ++vcpu->stat.halt_wakeup;
1534 }
1535
1536 me = get_cpu();
1537 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
1538 if (kvm_arch_vcpu_should_kick(vcpu))
1539 smp_send_reschedule(cpu);
1540 put_cpu();
1541}
Marcelo Tosatti8c847802012-03-14 17:58:48 -03001542#endif /* !CONFIG_S390 */
Christoffer Dallb6d33832012-03-08 16:44:24 -05001543
Avi Kivity6aa8b732006-12-10 02:21:36 -08001544void kvm_resched(struct kvm_vcpu *vcpu)
1545{
Yaozu Dong3fca0362007-04-25 16:49:19 +03001546 if (!need_resched())
1547 return;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001548 cond_resched();
Avi Kivity6aa8b732006-12-10 02:21:36 -08001549}
1550EXPORT_SYMBOL_GPL(kvm_resched);
1551
Konstantin Weitz41628d32012-04-25 15:30:38 +02001552bool kvm_vcpu_yield_to(struct kvm_vcpu *target)
1553{
1554 struct pid *pid;
1555 struct task_struct *task = NULL;
1556
1557 rcu_read_lock();
1558 pid = rcu_dereference(target->pid);
1559 if (pid)
1560 task = get_pid_task(target->pid, PIDTYPE_PID);
1561 rcu_read_unlock();
1562 if (!task)
1563 return false;
1564 if (task->flags & PF_VCPU) {
1565 put_task_struct(task);
1566 return false;
1567 }
1568 if (yield_to(task, 1)) {
1569 put_task_struct(task);
1570 return true;
1571 }
1572 put_task_struct(task);
1573 return false;
1574}
1575EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
1576
Rik van Riel217ece62011-02-01 09:53:28 -05001577void kvm_vcpu_on_spin(struct kvm_vcpu *me)
Zhai, Edwind255f4f2009-10-09 18:03:20 +08001578{
Rik van Riel217ece62011-02-01 09:53:28 -05001579 struct kvm *kvm = me->kvm;
1580 struct kvm_vcpu *vcpu;
1581 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
1582 int yielded = 0;
1583 int pass;
1584 int i;
Zhai, Edwind255f4f2009-10-09 18:03:20 +08001585
Rik van Riel217ece62011-02-01 09:53:28 -05001586 /*
1587 * We boost the priority of a VCPU that is runnable but not
1588 * currently running, because it got preempted by something
1589 * else and called schedule in __vcpu_run. Hopefully that
1590 * VCPU is holding the lock that we need and will release it.
1591 * We approximate round-robin by starting at the last boosted VCPU.
1592 */
1593 for (pass = 0; pass < 2 && !yielded; pass++) {
1594 kvm_for_each_vcpu(i, vcpu, kvm) {
Rik van Riel5cfc2aa2012-06-19 16:51:04 -04001595 if (!pass && i <= last_boosted_vcpu) {
Rik van Riel217ece62011-02-01 09:53:28 -05001596 i = last_boosted_vcpu;
1597 continue;
1598 } else if (pass && i > last_boosted_vcpu)
1599 break;
1600 if (vcpu == me)
1601 continue;
1602 if (waitqueue_active(&vcpu->wq))
1603 continue;
Konstantin Weitz41628d32012-04-25 15:30:38 +02001604 if (kvm_vcpu_yield_to(vcpu)) {
Rik van Riel217ece62011-02-01 09:53:28 -05001605 kvm->last_boosted_vcpu = i;
1606 yielded = 1;
1607 break;
1608 }
Rik van Riel217ece62011-02-01 09:53:28 -05001609 }
1610 }
Zhai, Edwind255f4f2009-10-09 18:03:20 +08001611}
1612EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1613
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001614static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001615{
1616 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001617 struct page *page;
1618
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001619 if (vmf->pgoff == 0)
Avi Kivity039576c2007-03-20 12:46:50 +02001620 page = virt_to_page(vcpu->run);
Avi Kivity09566762008-01-23 18:14:23 +02001621#ifdef CONFIG_X86
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001622 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
Zhang Xiantaoad312c72007-12-13 23:50:52 +08001623 page = virt_to_page(vcpu->arch.pio_data);
Avi Kivity09566762008-01-23 18:14:23 +02001624#endif
Laurent Vivier5f94c172008-05-30 16:05:54 +02001625#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1626 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1627 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1628#endif
Avi Kivity039576c2007-03-20 12:46:50 +02001629 else
Carsten Otte5b1c1492012-01-04 10:25:23 +01001630 return kvm_arch_vcpu_fault(vcpu, vmf);
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001631 get_page(page);
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001632 vmf->page = page;
1633 return 0;
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001634}
1635
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +04001636static const struct vm_operations_struct kvm_vcpu_vm_ops = {
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001637 .fault = kvm_vcpu_fault,
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001638};
1639
1640static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1641{
1642 vma->vm_ops = &kvm_vcpu_vm_ops;
1643 return 0;
1644}
1645
Avi Kivitybccf2152007-02-21 18:04:26 +02001646static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1647{
1648 struct kvm_vcpu *vcpu = filp->private_data;
1649
Al Viro66c0b392008-04-19 20:33:56 +01001650 kvm_put_kvm(vcpu->kvm);
Avi Kivitybccf2152007-02-21 18:04:26 +02001651 return 0;
1652}
1653
Christian Borntraeger3d3aab12008-12-02 11:17:32 +01001654static struct file_operations kvm_vcpu_fops = {
Avi Kivitybccf2152007-02-21 18:04:26 +02001655 .release = kvm_vcpu_release,
1656 .unlocked_ioctl = kvm_vcpu_ioctl,
Alexander Graf1dda6062011-06-08 02:45:37 +02001657#ifdef CONFIG_COMPAT
1658 .compat_ioctl = kvm_vcpu_compat_ioctl,
1659#endif
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001660 .mmap = kvm_vcpu_mmap,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001661 .llseek = noop_llseek,
Avi Kivitybccf2152007-02-21 18:04:26 +02001662};
1663
1664/*
1665 * Allocates an inode for the vcpu.
1666 */
1667static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1668{
Roland Dreier628ff7c2009-12-18 09:41:24 -08001669 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
Avi Kivitybccf2152007-02-21 18:04:26 +02001670}
1671
Avi Kivityc5ea7662007-02-20 18:41:05 +02001672/*
1673 * Creates some virtual cpus. Good luck creating more than one.
1674 */
Gleb Natapov73880c82009-06-09 15:56:28 +03001675static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
Avi Kivityc5ea7662007-02-20 18:41:05 +02001676{
1677 int r;
Gleb Natapov988a2ca2009-06-09 15:56:29 +03001678 struct kvm_vcpu *vcpu, *v;
Avi Kivityc5ea7662007-02-20 18:41:05 +02001679
Gleb Natapov73880c82009-06-09 15:56:28 +03001680 vcpu = kvm_arch_vcpu_create(kvm, id);
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001681 if (IS_ERR(vcpu))
1682 return PTR_ERR(vcpu);
Avi Kivityc5ea7662007-02-20 18:41:05 +02001683
Avi Kivity15ad7142007-07-11 18:17:21 +03001684 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1685
Avi Kivity26e52152007-11-20 15:30:24 +02001686 r = kvm_arch_vcpu_setup(vcpu);
1687 if (r)
Jan Kiszkad7805922011-05-23 10:33:05 +02001688 goto vcpu_destroy;
Avi Kivity26e52152007-11-20 15:30:24 +02001689
Shaohua Li11ec2802007-07-23 14:51:37 +08001690 mutex_lock(&kvm->lock);
Avi Kivity3e515702012-03-05 14:23:29 +02001691 if (!kvm_vcpu_compatible(vcpu)) {
1692 r = -EINVAL;
1693 goto unlock_vcpu_destroy;
1694 }
Gleb Natapov73880c82009-06-09 15:56:28 +03001695 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1696 r = -EINVAL;
Jan Kiszkad7805922011-05-23 10:33:05 +02001697 goto unlock_vcpu_destroy;
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001698 }
Gleb Natapov73880c82009-06-09 15:56:28 +03001699
Gleb Natapov988a2ca2009-06-09 15:56:29 +03001700 kvm_for_each_vcpu(r, v, kvm)
1701 if (v->vcpu_id == id) {
Gleb Natapov73880c82009-06-09 15:56:28 +03001702 r = -EEXIST;
Jan Kiszkad7805922011-05-23 10:33:05 +02001703 goto unlock_vcpu_destroy;
Gleb Natapov73880c82009-06-09 15:56:28 +03001704 }
1705
1706 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001707
1708 /* Now it's all set up, let userspace reach it */
Al Viro66c0b392008-04-19 20:33:56 +01001709 kvm_get_kvm(kvm);
Avi Kivitybccf2152007-02-21 18:04:26 +02001710 r = create_vcpu_fd(vcpu);
Gleb Natapov73880c82009-06-09 15:56:28 +03001711 if (r < 0) {
1712 kvm_put_kvm(kvm);
Jan Kiszkad7805922011-05-23 10:33:05 +02001713 goto unlock_vcpu_destroy;
Gleb Natapov73880c82009-06-09 15:56:28 +03001714 }
1715
1716 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1717 smp_wmb();
1718 atomic_inc(&kvm->online_vcpus);
1719
Gleb Natapov73880c82009-06-09 15:56:28 +03001720 mutex_unlock(&kvm->lock);
Avi Kivitybccf2152007-02-21 18:04:26 +02001721 return r;
Avi Kivityc5ea7662007-02-20 18:41:05 +02001722
Jan Kiszkad7805922011-05-23 10:33:05 +02001723unlock_vcpu_destroy:
Glauber Costa7d8fece2008-09-17 23:16:59 -03001724 mutex_unlock(&kvm->lock);
Jan Kiszkad7805922011-05-23 10:33:05 +02001725vcpu_destroy:
Hollis Blanchardd40ccc62007-11-19 14:04:43 -06001726 kvm_arch_vcpu_destroy(vcpu);
Avi Kivityc5ea7662007-02-20 18:41:05 +02001727 return r;
1728}
1729
Avi Kivity1961d272007-03-05 19:46:05 +02001730static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1731{
1732 if (sigset) {
1733 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1734 vcpu->sigset_active = 1;
1735 vcpu->sigset = *sigset;
1736 } else
1737 vcpu->sigset_active = 0;
1738 return 0;
1739}
1740
Avi Kivitybccf2152007-02-21 18:04:26 +02001741static long kvm_vcpu_ioctl(struct file *filp,
1742 unsigned int ioctl, unsigned long arg)
Avi Kivity6aa8b732006-12-10 02:21:36 -08001743{
Avi Kivitybccf2152007-02-21 18:04:26 +02001744 struct kvm_vcpu *vcpu = filp->private_data;
Al Viro2f3669872007-02-09 16:38:35 +00001745 void __user *argp = (void __user *)arg;
Carsten Otte313a3dc2007-10-11 19:16:52 +02001746 int r;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001747 struct kvm_fpu *fpu = NULL;
1748 struct kvm_sregs *kvm_sregs = NULL;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001749
Avi Kivity6d4e4c42007-11-21 16:41:05 +02001750 if (vcpu->kvm->mm != current->mm)
1751 return -EIO;
Avi Kivity2122ff52010-05-13 11:25:04 +03001752
1753#if defined(CONFIG_S390) || defined(CONFIG_PPC)
1754 /*
1755 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1756 * so vcpu_load() would break it.
1757 */
1758 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1759 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1760#endif
1761
1762
1763 vcpu_load(vcpu);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001764 switch (ioctl) {
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001765 case KVM_RUN:
Avi Kivityf0fe5102007-03-07 13:11:17 +02001766 r = -EINVAL;
1767 if (arg)
1768 goto out;
Hollis Blanchardb6c7a5d2007-11-01 14:16:10 -05001769 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
Gleb Natapov64be5002010-10-24 16:49:08 +02001770 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001771 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001772 case KVM_GET_REGS: {
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001773 struct kvm_regs *kvm_regs;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001774
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001775 r = -ENOMEM;
1776 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1777 if (!kvm_regs)
1778 goto out;
1779 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001780 if (r)
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001781 goto out_free1;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001782 r = -EFAULT;
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001783 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1784 goto out_free1;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001785 r = 0;
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001786out_free1:
1787 kfree(kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001788 break;
1789 }
1790 case KVM_SET_REGS: {
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001791 struct kvm_regs *kvm_regs;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001792
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001793 r = -ENOMEM;
Sasha Levinff5c2c02011-12-04 19:36:29 +02001794 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
1795 if (IS_ERR(kvm_regs)) {
1796 r = PTR_ERR(kvm_regs);
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001797 goto out;
Sasha Levinff5c2c02011-12-04 19:36:29 +02001798 }
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001799 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001800 if (r)
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001801 goto out_free2;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001802 r = 0;
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001803out_free2:
1804 kfree(kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001805 break;
1806 }
1807 case KVM_GET_SREGS: {
Dave Hansenfa3795a2008-08-11 10:01:46 -07001808 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1809 r = -ENOMEM;
1810 if (!kvm_sregs)
1811 goto out;
1812 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001813 if (r)
1814 goto out;
1815 r = -EFAULT;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001816 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001817 goto out;
1818 r = 0;
1819 break;
1820 }
1821 case KVM_SET_SREGS: {
Sasha Levinff5c2c02011-12-04 19:36:29 +02001822 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
1823 if (IS_ERR(kvm_sregs)) {
1824 r = PTR_ERR(kvm_sregs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001825 goto out;
Sasha Levinff5c2c02011-12-04 19:36:29 +02001826 }
Dave Hansenfa3795a2008-08-11 10:01:46 -07001827 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001828 if (r)
1829 goto out;
1830 r = 0;
1831 break;
1832 }
Marcelo Tosatti62d9f0d2008-04-11 13:24:45 -03001833 case KVM_GET_MP_STATE: {
1834 struct kvm_mp_state mp_state;
1835
1836 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1837 if (r)
1838 goto out;
1839 r = -EFAULT;
1840 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1841 goto out;
1842 r = 0;
1843 break;
1844 }
1845 case KVM_SET_MP_STATE: {
1846 struct kvm_mp_state mp_state;
1847
1848 r = -EFAULT;
1849 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1850 goto out;
1851 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1852 if (r)
1853 goto out;
1854 r = 0;
1855 break;
1856 }
Avi Kivity6aa8b732006-12-10 02:21:36 -08001857 case KVM_TRANSLATE: {
1858 struct kvm_translation tr;
1859
1860 r = -EFAULT;
Al Viro2f3669872007-02-09 16:38:35 +00001861 if (copy_from_user(&tr, argp, sizeof tr))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001862 goto out;
Zhang Xiantao8b006792007-11-16 13:05:55 +08001863 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001864 if (r)
1865 goto out;
1866 r = -EFAULT;
Al Viro2f3669872007-02-09 16:38:35 +00001867 if (copy_to_user(argp, &tr, sizeof tr))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001868 goto out;
1869 r = 0;
1870 break;
1871 }
Jan Kiszkad0bfb942008-12-15 13:52:10 +01001872 case KVM_SET_GUEST_DEBUG: {
1873 struct kvm_guest_debug dbg;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001874
1875 r = -EFAULT;
Al Viro2f3669872007-02-09 16:38:35 +00001876 if (copy_from_user(&dbg, argp, sizeof dbg))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001877 goto out;
Jan Kiszkad0bfb942008-12-15 13:52:10 +01001878 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001879 if (r)
1880 goto out;
1881 r = 0;
1882 break;
1883 }
Avi Kivity1961d272007-03-05 19:46:05 +02001884 case KVM_SET_SIGNAL_MASK: {
1885 struct kvm_signal_mask __user *sigmask_arg = argp;
1886 struct kvm_signal_mask kvm_sigmask;
1887 sigset_t sigset, *p;
1888
1889 p = NULL;
1890 if (argp) {
1891 r = -EFAULT;
1892 if (copy_from_user(&kvm_sigmask, argp,
1893 sizeof kvm_sigmask))
1894 goto out;
1895 r = -EINVAL;
1896 if (kvm_sigmask.len != sizeof sigset)
1897 goto out;
1898 r = -EFAULT;
1899 if (copy_from_user(&sigset, sigmask_arg->sigset,
1900 sizeof sigset))
1901 goto out;
1902 p = &sigset;
1903 }
Andi Kleen376d41f2010-06-10 13:10:47 +02001904 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
Avi Kivity1961d272007-03-05 19:46:05 +02001905 break;
1906 }
Avi Kivityb8836732007-04-01 16:34:31 +03001907 case KVM_GET_FPU: {
Dave Hansenfa3795a2008-08-11 10:01:46 -07001908 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1909 r = -ENOMEM;
1910 if (!fpu)
1911 goto out;
1912 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
Avi Kivityb8836732007-04-01 16:34:31 +03001913 if (r)
1914 goto out;
1915 r = -EFAULT;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001916 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
Avi Kivityb8836732007-04-01 16:34:31 +03001917 goto out;
1918 r = 0;
1919 break;
1920 }
1921 case KVM_SET_FPU: {
Sasha Levinff5c2c02011-12-04 19:36:29 +02001922 fpu = memdup_user(argp, sizeof(*fpu));
1923 if (IS_ERR(fpu)) {
1924 r = PTR_ERR(fpu);
Avi Kivityb8836732007-04-01 16:34:31 +03001925 goto out;
Sasha Levinff5c2c02011-12-04 19:36:29 +02001926 }
Dave Hansenfa3795a2008-08-11 10:01:46 -07001927 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
Avi Kivityb8836732007-04-01 16:34:31 +03001928 if (r)
1929 goto out;
1930 r = 0;
1931 break;
1932 }
Avi Kivitybccf2152007-02-21 18:04:26 +02001933 default:
Carsten Otte313a3dc2007-10-11 19:16:52 +02001934 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
Avi Kivitybccf2152007-02-21 18:04:26 +02001935 }
1936out:
Avi Kivity2122ff52010-05-13 11:25:04 +03001937 vcpu_put(vcpu);
Dave Hansenfa3795a2008-08-11 10:01:46 -07001938 kfree(fpu);
1939 kfree(kvm_sregs);
Avi Kivitybccf2152007-02-21 18:04:26 +02001940 return r;
1941}
1942
Alexander Graf1dda6062011-06-08 02:45:37 +02001943#ifdef CONFIG_COMPAT
1944static long kvm_vcpu_compat_ioctl(struct file *filp,
1945 unsigned int ioctl, unsigned long arg)
1946{
1947 struct kvm_vcpu *vcpu = filp->private_data;
1948 void __user *argp = compat_ptr(arg);
1949 int r;
1950
1951 if (vcpu->kvm->mm != current->mm)
1952 return -EIO;
1953
1954 switch (ioctl) {
1955 case KVM_SET_SIGNAL_MASK: {
1956 struct kvm_signal_mask __user *sigmask_arg = argp;
1957 struct kvm_signal_mask kvm_sigmask;
1958 compat_sigset_t csigset;
1959 sigset_t sigset;
1960
1961 if (argp) {
1962 r = -EFAULT;
1963 if (copy_from_user(&kvm_sigmask, argp,
1964 sizeof kvm_sigmask))
1965 goto out;
1966 r = -EINVAL;
1967 if (kvm_sigmask.len != sizeof csigset)
1968 goto out;
1969 r = -EFAULT;
1970 if (copy_from_user(&csigset, sigmask_arg->sigset,
1971 sizeof csigset))
1972 goto out;
1973 }
1974 sigset_from_compat(&sigset, &csigset);
1975 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1976 break;
1977 }
1978 default:
1979 r = kvm_vcpu_ioctl(filp, ioctl, arg);
1980 }
1981
1982out:
1983 return r;
1984}
1985#endif
1986
Avi Kivitybccf2152007-02-21 18:04:26 +02001987static long kvm_vm_ioctl(struct file *filp,
1988 unsigned int ioctl, unsigned long arg)
1989{
1990 struct kvm *kvm = filp->private_data;
1991 void __user *argp = (void __user *)arg;
Carsten Otte1fe779f2007-10-29 16:08:35 +01001992 int r;
Avi Kivitybccf2152007-02-21 18:04:26 +02001993
Avi Kivity6d4e4c42007-11-21 16:41:05 +02001994 if (kvm->mm != current->mm)
1995 return -EIO;
Avi Kivitybccf2152007-02-21 18:04:26 +02001996 switch (ioctl) {
1997 case KVM_CREATE_VCPU:
1998 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1999 if (r < 0)
2000 goto out;
2001 break;
Izik Eidus6fc138d2007-10-09 19:20:39 +02002002 case KVM_SET_USER_MEMORY_REGION: {
2003 struct kvm_userspace_memory_region kvm_userspace_mem;
2004
2005 r = -EFAULT;
2006 if (copy_from_user(&kvm_userspace_mem, argp,
2007 sizeof kvm_userspace_mem))
2008 goto out;
2009
2010 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002011 if (r)
2012 goto out;
2013 break;
2014 }
2015 case KVM_GET_DIRTY_LOG: {
2016 struct kvm_dirty_log log;
2017
2018 r = -EFAULT;
Al Viro2f3669872007-02-09 16:38:35 +00002019 if (copy_from_user(&log, argp, sizeof log))
Avi Kivity6aa8b732006-12-10 02:21:36 -08002020 goto out;
Avi Kivity2c6f5df2007-02-20 18:27:58 +02002021 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002022 if (r)
2023 goto out;
2024 break;
2025 }
Laurent Vivier5f94c172008-05-30 16:05:54 +02002026#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2027 case KVM_REGISTER_COALESCED_MMIO: {
2028 struct kvm_coalesced_mmio_zone zone;
2029 r = -EFAULT;
2030 if (copy_from_user(&zone, argp, sizeof zone))
2031 goto out;
Laurent Vivier5f94c172008-05-30 16:05:54 +02002032 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2033 if (r)
2034 goto out;
2035 r = 0;
2036 break;
2037 }
2038 case KVM_UNREGISTER_COALESCED_MMIO: {
2039 struct kvm_coalesced_mmio_zone zone;
2040 r = -EFAULT;
2041 if (copy_from_user(&zone, argp, sizeof zone))
2042 goto out;
Laurent Vivier5f94c172008-05-30 16:05:54 +02002043 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2044 if (r)
2045 goto out;
2046 r = 0;
2047 break;
2048 }
2049#endif
Gregory Haskins721eecbf2009-05-20 10:30:49 -04002050 case KVM_IRQFD: {
2051 struct kvm_irqfd data;
2052
2053 r = -EFAULT;
2054 if (copy_from_user(&data, argp, sizeof data))
2055 goto out;
2056 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
2057 break;
2058 }
Gregory Haskinsd34e6b12009-07-07 17:08:49 -04002059 case KVM_IOEVENTFD: {
2060 struct kvm_ioeventfd data;
2061
2062 r = -EFAULT;
2063 if (copy_from_user(&data, argp, sizeof data))
2064 goto out;
2065 r = kvm_ioeventfd(kvm, &data);
2066 break;
2067 }
Gleb Natapov73880c82009-06-09 15:56:28 +03002068#ifdef CONFIG_KVM_APIC_ARCHITECTURE
2069 case KVM_SET_BOOT_CPU_ID:
2070 r = 0;
Marcelo Tosatti894a9c52009-06-23 15:05:14 -03002071 mutex_lock(&kvm->lock);
Gleb Natapov73880c82009-06-09 15:56:28 +03002072 if (atomic_read(&kvm->online_vcpus) != 0)
2073 r = -EBUSY;
2074 else
2075 kvm->bsp_vcpu_id = arg;
Marcelo Tosatti894a9c52009-06-23 15:05:14 -03002076 mutex_unlock(&kvm->lock);
Gleb Natapov73880c82009-06-09 15:56:28 +03002077 break;
2078#endif
Jan Kiszka07975ad2012-03-29 21:14:12 +02002079#ifdef CONFIG_HAVE_KVM_MSI
2080 case KVM_SIGNAL_MSI: {
2081 struct kvm_msi msi;
2082
2083 r = -EFAULT;
2084 if (copy_from_user(&msi, argp, sizeof msi))
2085 goto out;
2086 r = kvm_send_userspace_msi(kvm, &msi);
2087 break;
2088 }
2089#endif
Avi Kivityf17abe92007-02-21 19:28:04 +02002090 default:
Carsten Otte1fe779f2007-10-29 16:08:35 +01002091 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
Avi Kivitybfd99ff2009-08-26 14:57:50 +03002092 if (r == -ENOTTY)
2093 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
Avi Kivityf17abe92007-02-21 19:28:04 +02002094 }
2095out:
2096 return r;
2097}
2098
Arnd Bergmann6ff58942009-10-22 14:19:27 +02002099#ifdef CONFIG_COMPAT
2100struct compat_kvm_dirty_log {
2101 __u32 slot;
2102 __u32 padding1;
2103 union {
2104 compat_uptr_t dirty_bitmap; /* one bit per page */
2105 __u64 padding2;
2106 };
2107};
2108
2109static long kvm_vm_compat_ioctl(struct file *filp,
2110 unsigned int ioctl, unsigned long arg)
2111{
2112 struct kvm *kvm = filp->private_data;
2113 int r;
2114
2115 if (kvm->mm != current->mm)
2116 return -EIO;
2117 switch (ioctl) {
2118 case KVM_GET_DIRTY_LOG: {
2119 struct compat_kvm_dirty_log compat_log;
2120 struct kvm_dirty_log log;
2121
2122 r = -EFAULT;
2123 if (copy_from_user(&compat_log, (void __user *)arg,
2124 sizeof(compat_log)))
2125 goto out;
2126 log.slot = compat_log.slot;
2127 log.padding1 = compat_log.padding1;
2128 log.padding2 = compat_log.padding2;
2129 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2130
2131 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2132 if (r)
2133 goto out;
2134 break;
2135 }
2136 default:
2137 r = kvm_vm_ioctl(filp, ioctl, arg);
2138 }
2139
2140out:
2141 return r;
2142}
2143#endif
2144
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11002145static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Avi Kivityf17abe92007-02-21 19:28:04 +02002146{
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03002147 struct page *page[1];
2148 unsigned long addr;
2149 int npages;
2150 gfn_t gfn = vmf->pgoff;
Avi Kivityf17abe92007-02-21 19:28:04 +02002151 struct kvm *kvm = vma->vm_file->private_data;
Avi Kivityf17abe92007-02-21 19:28:04 +02002152
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03002153 addr = gfn_to_hva(kvm, gfn);
2154 if (kvm_is_error_hva(addr))
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11002155 return VM_FAULT_SIGBUS;
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03002156
2157 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2158 NULL);
2159 if (unlikely(npages != 1))
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11002160 return VM_FAULT_SIGBUS;
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03002161
2162 vmf->page = page[0];
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11002163 return 0;
Avi Kivityf17abe92007-02-21 19:28:04 +02002164}
2165
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +04002166static const struct vm_operations_struct kvm_vm_vm_ops = {
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11002167 .fault = kvm_vm_fault,
Avi Kivityf17abe92007-02-21 19:28:04 +02002168};
2169
2170static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2171{
2172 vma->vm_ops = &kvm_vm_vm_ops;
2173 return 0;
2174}
2175
Christian Borntraeger3d3aab12008-12-02 11:17:32 +01002176static struct file_operations kvm_vm_fops = {
Avi Kivityf17abe92007-02-21 19:28:04 +02002177 .release = kvm_vm_release,
2178 .unlocked_ioctl = kvm_vm_ioctl,
Arnd Bergmann6ff58942009-10-22 14:19:27 +02002179#ifdef CONFIG_COMPAT
2180 .compat_ioctl = kvm_vm_compat_ioctl,
2181#endif
Avi Kivityf17abe92007-02-21 19:28:04 +02002182 .mmap = kvm_vm_mmap,
Arnd Bergmann6038f372010-08-15 18:52:59 +02002183 .llseek = noop_llseek,
Avi Kivityf17abe92007-02-21 19:28:04 +02002184};
2185
Carsten Ottee08b9632012-01-04 10:25:20 +01002186static int kvm_dev_ioctl_create_vm(unsigned long type)
Avi Kivityf17abe92007-02-21 19:28:04 +02002187{
Heiko Carstensaac87632010-10-27 17:22:10 +02002188 int r;
Avi Kivityf17abe92007-02-21 19:28:04 +02002189 struct kvm *kvm;
2190
Carsten Ottee08b9632012-01-04 10:25:20 +01002191 kvm = kvm_create_vm(type);
Avi Kivityd6d28162007-06-28 08:38:16 -04002192 if (IS_ERR(kvm))
2193 return PTR_ERR(kvm);
Takuya Yoshikawa6ce5a092010-03-15 22:13:30 +09002194#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2195 r = kvm_coalesced_mmio_init(kvm);
2196 if (r < 0) {
2197 kvm_put_kvm(kvm);
2198 return r;
2199 }
2200#endif
Heiko Carstensaac87632010-10-27 17:22:10 +02002201 r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
2202 if (r < 0)
Al Viro66c0b392008-04-19 20:33:56 +01002203 kvm_put_kvm(kvm);
Avi Kivityf17abe92007-02-21 19:28:04 +02002204
Heiko Carstensaac87632010-10-27 17:22:10 +02002205 return r;
Avi Kivityf17abe92007-02-21 19:28:04 +02002206}
2207
Avi Kivity1a811b62008-12-08 18:25:27 +02002208static long kvm_dev_ioctl_check_extension_generic(long arg)
2209{
2210 switch (arg) {
Avi Kivityca9edae2008-12-08 18:29:29 +02002211 case KVM_CAP_USER_MEMORY:
Avi Kivity1a811b62008-12-08 18:25:27 +02002212 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
Jan Kiszka4cd481f2009-04-13 11:59:32 +02002213 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
Gleb Natapov73880c82009-06-09 15:56:28 +03002214#ifdef CONFIG_KVM_APIC_ARCHITECTURE
2215 case KVM_CAP_SET_BOOT_CPU_ID:
2216#endif
Avi Kivitya9c73992009-11-04 11:54:59 +02002217 case KVM_CAP_INTERNAL_ERROR_DATA:
Jan Kiszka07975ad2012-03-29 21:14:12 +02002218#ifdef CONFIG_HAVE_KVM_MSI
2219 case KVM_CAP_SIGNAL_MSI:
2220#endif
Avi Kivity1a811b62008-12-08 18:25:27 +02002221 return 1;
Marc Zyngier9900b4b2012-06-15 15:07:02 -04002222#ifdef KVM_CAP_IRQ_ROUTING
Avi Kivity399ec802008-11-19 13:58:46 +02002223 case KVM_CAP_IRQ_ROUTING:
Sheng Yang36463142009-03-16 16:33:43 +08002224 return KVM_MAX_IRQ_ROUTES;
Avi Kivity399ec802008-11-19 13:58:46 +02002225#endif
Avi Kivity1a811b62008-12-08 18:25:27 +02002226 default:
2227 break;
2228 }
2229 return kvm_dev_ioctl_check_extension(arg);
2230}
2231
Avi Kivityf17abe92007-02-21 19:28:04 +02002232static long kvm_dev_ioctl(struct file *filp,
2233 unsigned int ioctl, unsigned long arg)
2234{
Avi Kivity07c45a32007-03-07 13:05:38 +02002235 long r = -EINVAL;
Avi Kivityf17abe92007-02-21 19:28:04 +02002236
2237 switch (ioctl) {
2238 case KVM_GET_API_VERSION:
Avi Kivityf0fe5102007-03-07 13:11:17 +02002239 r = -EINVAL;
2240 if (arg)
2241 goto out;
Avi Kivityf17abe92007-02-21 19:28:04 +02002242 r = KVM_API_VERSION;
2243 break;
2244 case KVM_CREATE_VM:
Carsten Ottee08b9632012-01-04 10:25:20 +01002245 r = kvm_dev_ioctl_create_vm(arg);
Avi Kivityf17abe92007-02-21 19:28:04 +02002246 break;
Zhang Xiantao018d00d2007-11-15 23:07:47 +08002247 case KVM_CHECK_EXTENSION:
Avi Kivity1a811b62008-12-08 18:25:27 +02002248 r = kvm_dev_ioctl_check_extension_generic(arg);
Avi Kivity5d308f42007-03-01 17:56:20 +02002249 break;
Avi Kivity07c45a32007-03-07 13:05:38 +02002250 case KVM_GET_VCPU_MMAP_SIZE:
2251 r = -EINVAL;
2252 if (arg)
2253 goto out;
Avi Kivityadb1ff42008-01-24 15:13:08 +02002254 r = PAGE_SIZE; /* struct kvm_run */
2255#ifdef CONFIG_X86
2256 r += PAGE_SIZE; /* pio data page */
2257#endif
Laurent Vivier5f94c172008-05-30 16:05:54 +02002258#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2259 r += PAGE_SIZE; /* coalesced mmio ring page */
2260#endif
Avi Kivity07c45a32007-03-07 13:05:38 +02002261 break;
Feng(Eric) Liud4c9ff22008-04-10 08:47:53 -04002262 case KVM_TRACE_ENABLE:
2263 case KVM_TRACE_PAUSE:
2264 case KVM_TRACE_DISABLE:
Marcelo Tosatti2023a292009-06-18 11:47:28 -03002265 r = -EOPNOTSUPP;
Feng(Eric) Liud4c9ff22008-04-10 08:47:53 -04002266 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002267 default:
Carsten Otte043405e2007-10-10 17:16:19 +02002268 return kvm_arch_dev_ioctl(filp, ioctl, arg);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002269 }
2270out:
2271 return r;
2272}
2273
Avi Kivity6aa8b732006-12-10 02:21:36 -08002274static struct file_operations kvm_chardev_ops = {
Avi Kivity6aa8b732006-12-10 02:21:36 -08002275 .unlocked_ioctl = kvm_dev_ioctl,
2276 .compat_ioctl = kvm_dev_ioctl,
Arnd Bergmann6038f372010-08-15 18:52:59 +02002277 .llseek = noop_llseek,
Avi Kivity6aa8b732006-12-10 02:21:36 -08002278};
2279
2280static struct miscdevice kvm_dev = {
Avi Kivitybbe44322007-03-04 13:27:36 +02002281 KVM_MINOR,
Avi Kivity6aa8b732006-12-10 02:21:36 -08002282 "kvm",
2283 &kvm_chardev_ops,
2284};
2285
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002286static void hardware_enable_nolock(void *junk)
Avi Kivity1b6c0162007-05-24 13:03:52 +03002287{
2288 int cpu = raw_smp_processor_id();
Alexander Graf10474ae2009-09-15 11:37:46 +02002289 int r;
Avi Kivity1b6c0162007-05-24 13:03:52 +03002290
Rusty Russell7f59f492008-12-07 21:25:45 +10302291 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
Avi Kivity1b6c0162007-05-24 13:03:52 +03002292 return;
Alexander Graf10474ae2009-09-15 11:37:46 +02002293
Rusty Russell7f59f492008-12-07 21:25:45 +10302294 cpumask_set_cpu(cpu, cpus_hardware_enabled);
Alexander Graf10474ae2009-09-15 11:37:46 +02002295
2296 r = kvm_arch_hardware_enable(NULL);
2297
2298 if (r) {
2299 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2300 atomic_inc(&hardware_enable_failed);
2301 printk(KERN_INFO "kvm: enabling virtualization on "
2302 "CPU%d failed\n", cpu);
2303 }
Avi Kivity1b6c0162007-05-24 13:03:52 +03002304}
2305
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002306static void hardware_enable(void *junk)
2307{
Jan Kiszkae935b832011-02-08 12:55:33 +01002308 raw_spin_lock(&kvm_lock);
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002309 hardware_enable_nolock(junk);
Jan Kiszkae935b832011-02-08 12:55:33 +01002310 raw_spin_unlock(&kvm_lock);
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002311}
2312
2313static void hardware_disable_nolock(void *junk)
Avi Kivity1b6c0162007-05-24 13:03:52 +03002314{
2315 int cpu = raw_smp_processor_id();
2316
Rusty Russell7f59f492008-12-07 21:25:45 +10302317 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
Avi Kivity1b6c0162007-05-24 13:03:52 +03002318 return;
Rusty Russell7f59f492008-12-07 21:25:45 +10302319 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002320 kvm_arch_hardware_disable(NULL);
Avi Kivity1b6c0162007-05-24 13:03:52 +03002321}
2322
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002323static void hardware_disable(void *junk)
2324{
Jan Kiszkae935b832011-02-08 12:55:33 +01002325 raw_spin_lock(&kvm_lock);
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002326 hardware_disable_nolock(junk);
Jan Kiszkae935b832011-02-08 12:55:33 +01002327 raw_spin_unlock(&kvm_lock);
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002328}
2329
Alexander Graf10474ae2009-09-15 11:37:46 +02002330static void hardware_disable_all_nolock(void)
2331{
2332 BUG_ON(!kvm_usage_count);
2333
2334 kvm_usage_count--;
2335 if (!kvm_usage_count)
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002336 on_each_cpu(hardware_disable_nolock, NULL, 1);
Alexander Graf10474ae2009-09-15 11:37:46 +02002337}
2338
2339static void hardware_disable_all(void)
2340{
Jan Kiszkae935b832011-02-08 12:55:33 +01002341 raw_spin_lock(&kvm_lock);
Alexander Graf10474ae2009-09-15 11:37:46 +02002342 hardware_disable_all_nolock();
Jan Kiszkae935b832011-02-08 12:55:33 +01002343 raw_spin_unlock(&kvm_lock);
Alexander Graf10474ae2009-09-15 11:37:46 +02002344}
2345
2346static int hardware_enable_all(void)
2347{
2348 int r = 0;
2349
Jan Kiszkae935b832011-02-08 12:55:33 +01002350 raw_spin_lock(&kvm_lock);
Alexander Graf10474ae2009-09-15 11:37:46 +02002351
2352 kvm_usage_count++;
2353 if (kvm_usage_count == 1) {
2354 atomic_set(&hardware_enable_failed, 0);
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002355 on_each_cpu(hardware_enable_nolock, NULL, 1);
Alexander Graf10474ae2009-09-15 11:37:46 +02002356
2357 if (atomic_read(&hardware_enable_failed)) {
2358 hardware_disable_all_nolock();
2359 r = -EBUSY;
2360 }
2361 }
2362
Jan Kiszkae935b832011-02-08 12:55:33 +01002363 raw_spin_unlock(&kvm_lock);
Alexander Graf10474ae2009-09-15 11:37:46 +02002364
2365 return r;
2366}
2367
Avi Kivity774c47f2007-02-12 00:54:47 -08002368static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2369 void *v)
2370{
2371 int cpu = (long)v;
2372
Alexander Graf10474ae2009-09-15 11:37:46 +02002373 if (!kvm_usage_count)
2374 return NOTIFY_OK;
2375
Avi Kivity1a6f4d72007-11-11 18:37:32 +02002376 val &= ~CPU_TASKS_FROZEN;
Avi Kivity774c47f2007-02-12 00:54:47 -08002377 switch (val) {
Avi Kivitycec9ad22007-05-24 13:11:41 +03002378 case CPU_DYING:
Avi Kivity6ec8a8562007-08-19 15:57:26 +03002379 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2380 cpu);
2381 hardware_disable(NULL);
2382 break;
Zachary Amsdenda908f22010-08-19 22:07:27 -10002383 case CPU_STARTING:
Jeremy Katz43934a32007-02-19 14:37:46 +02002384 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2385 cpu);
Zachary Amsdenda908f22010-08-19 22:07:27 -10002386 hardware_enable(NULL);
Avi Kivity774c47f2007-02-12 00:54:47 -08002387 break;
2388 }
2389 return NOTIFY_OK;
2390}
2391
Avi Kivity4ecac3f2008-05-13 13:23:38 +03002392
Avi Kivityb7c41452010-12-02 17:52:50 +02002393asmlinkage void kvm_spurious_fault(void)
Avi Kivity4ecac3f2008-05-13 13:23:38 +03002394{
Avi Kivity4ecac3f2008-05-13 13:23:38 +03002395 /* Fault while not rebooting. We want the trace. */
2396 BUG();
2397}
Avi Kivityb7c41452010-12-02 17:52:50 +02002398EXPORT_SYMBOL_GPL(kvm_spurious_fault);
Avi Kivity4ecac3f2008-05-13 13:23:38 +03002399
Rusty Russell9a2b85c2007-07-17 23:17:55 +10002400static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
Mike Dayd77c26f2007-10-08 09:02:08 -04002401 void *v)
Rusty Russell9a2b85c2007-07-17 23:17:55 +10002402{
Sheng Yang8e1c1812009-04-29 11:09:04 +08002403 /*
2404 * Some (well, at least mine) BIOSes hang on reboot if
2405 * in vmx root mode.
2406 *
2407 * And Intel TXT required VMX off for all cpu when system shutdown.
2408 */
2409 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2410 kvm_rebooting = true;
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002411 on_each_cpu(hardware_disable_nolock, NULL, 1);
Rusty Russell9a2b85c2007-07-17 23:17:55 +10002412 return NOTIFY_OK;
2413}
2414
2415static struct notifier_block kvm_reboot_notifier = {
2416 .notifier_call = kvm_reboot,
2417 .priority = 0,
2418};
2419
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002420static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002421{
2422 int i;
2423
2424 for (i = 0; i < bus->dev_count; i++) {
Sasha Levin743eeb02011-07-27 16:00:48 +03002425 struct kvm_io_device *pos = bus->range[i].dev;
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002426
2427 kvm_iodevice_destructor(pos);
2428 }
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002429 kfree(bus);
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002430}
2431
Sasha Levin743eeb02011-07-27 16:00:48 +03002432int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
2433{
2434 const struct kvm_io_range *r1 = p1;
2435 const struct kvm_io_range *r2 = p2;
2436
2437 if (r1->addr < r2->addr)
2438 return -1;
2439 if (r1->addr + r1->len > r2->addr + r2->len)
2440 return 1;
2441 return 0;
2442}
2443
2444int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
2445 gpa_t addr, int len)
2446{
Sasha Levin743eeb02011-07-27 16:00:48 +03002447 bus->range[bus->dev_count++] = (struct kvm_io_range) {
2448 .addr = addr,
2449 .len = len,
2450 .dev = dev,
2451 };
2452
2453 sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
2454 kvm_io_bus_sort_cmp, NULL);
2455
2456 return 0;
2457}
2458
2459int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
2460 gpa_t addr, int len)
2461{
2462 struct kvm_io_range *range, key;
2463 int off;
2464
2465 key = (struct kvm_io_range) {
2466 .addr = addr,
2467 .len = len,
2468 };
2469
2470 range = bsearch(&key, bus->range, bus->dev_count,
2471 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
2472 if (range == NULL)
2473 return -ENOENT;
2474
2475 off = range - bus->range;
2476
2477 while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0)
2478 off--;
2479
2480 return off;
2481}
2482
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002483/* kvm_io_bus_write - called under kvm->slots_lock */
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002484int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002485 int len, const void *val)
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002486{
Sasha Levin743eeb02011-07-27 16:00:48 +03002487 int idx;
Lai Jiangshan90d83dc2010-04-19 17:41:23 +08002488 struct kvm_io_bus *bus;
Sasha Levin743eeb02011-07-27 16:00:48 +03002489 struct kvm_io_range range;
2490
2491 range = (struct kvm_io_range) {
2492 .addr = addr,
2493 .len = len,
2494 };
Lai Jiangshan90d83dc2010-04-19 17:41:23 +08002495
2496 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
Sasha Levin743eeb02011-07-27 16:00:48 +03002497 idx = kvm_io_bus_get_first_dev(bus, addr, len);
2498 if (idx < 0)
2499 return -EOPNOTSUPP;
2500
2501 while (idx < bus->dev_count &&
2502 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2503 if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val))
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002504 return 0;
Sasha Levin743eeb02011-07-27 16:00:48 +03002505 idx++;
2506 }
2507
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002508 return -EOPNOTSUPP;
2509}
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002510
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002511/* kvm_io_bus_read - called under kvm->slots_lock */
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002512int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2513 int len, void *val)
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002514{
Sasha Levin743eeb02011-07-27 16:00:48 +03002515 int idx;
Lai Jiangshan90d83dc2010-04-19 17:41:23 +08002516 struct kvm_io_bus *bus;
Sasha Levin743eeb02011-07-27 16:00:48 +03002517 struct kvm_io_range range;
2518
2519 range = (struct kvm_io_range) {
2520 .addr = addr,
2521 .len = len,
2522 };
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002523
Lai Jiangshan90d83dc2010-04-19 17:41:23 +08002524 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
Sasha Levin743eeb02011-07-27 16:00:48 +03002525 idx = kvm_io_bus_get_first_dev(bus, addr, len);
2526 if (idx < 0)
2527 return -EOPNOTSUPP;
2528
2529 while (idx < bus->dev_count &&
2530 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2531 if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val))
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002532 return 0;
Sasha Levin743eeb02011-07-27 16:00:48 +03002533 idx++;
2534 }
2535
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002536 return -EOPNOTSUPP;
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002537}
2538
Marcelo Tosatti79fac952009-12-23 14:35:26 -02002539/* Caller must hold slots_lock. */
Sasha Levin743eeb02011-07-27 16:00:48 +03002540int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2541 int len, struct kvm_io_device *dev)
Michael S. Tsirkin6c474692009-06-29 22:24:26 +03002542{
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002543 struct kvm_io_bus *new_bus, *bus;
Gregory Haskins090b7af2009-07-07 17:08:44 -04002544
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002545 bus = kvm->buses[bus_idx];
Amos Konga13007162012-03-09 12:17:32 +08002546 if (bus->dev_count > NR_IOBUS_DEVS - 1)
Gregory Haskins090b7af2009-07-07 17:08:44 -04002547 return -ENOSPC;
2548
Amos Konga13007162012-03-09 12:17:32 +08002549 new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) *
2550 sizeof(struct kvm_io_range)), GFP_KERNEL);
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002551 if (!new_bus)
2552 return -ENOMEM;
Amos Konga13007162012-03-09 12:17:32 +08002553 memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
2554 sizeof(struct kvm_io_range)));
Sasha Levin743eeb02011-07-27 16:00:48 +03002555 kvm_io_bus_insert_dev(new_bus, dev, addr, len);
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002556 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2557 synchronize_srcu_expedited(&kvm->srcu);
2558 kfree(bus);
Gregory Haskins090b7af2009-07-07 17:08:44 -04002559
2560 return 0;
2561}
2562
Marcelo Tosatti79fac952009-12-23 14:35:26 -02002563/* Caller must hold slots_lock. */
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002564int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2565 struct kvm_io_device *dev)
Gregory Haskins090b7af2009-07-07 17:08:44 -04002566{
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002567 int i, r;
2568 struct kvm_io_bus *new_bus, *bus;
Michael S. Tsirkin6c474692009-06-29 22:24:26 +03002569
Sasha Levincdfca7b2011-12-04 19:36:28 +02002570 bus = kvm->buses[bus_idx];
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002571 r = -ENOENT;
Amos Konga13007162012-03-09 12:17:32 +08002572 for (i = 0; i < bus->dev_count; i++)
2573 if (bus->range[i].dev == dev) {
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002574 r = 0;
Gregory Haskins090b7af2009-07-07 17:08:44 -04002575 break;
2576 }
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002577
Amos Konga13007162012-03-09 12:17:32 +08002578 if (r)
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002579 return r;
Amos Konga13007162012-03-09 12:17:32 +08002580
2581 new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) *
2582 sizeof(struct kvm_io_range)), GFP_KERNEL);
2583 if (!new_bus)
2584 return -ENOMEM;
2585
2586 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
2587 new_bus->dev_count--;
2588 memcpy(new_bus->range + i, bus->range + i + 1,
2589 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002590
2591 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2592 synchronize_srcu_expedited(&kvm->srcu);
2593 kfree(bus);
2594 return r;
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002595}
2596
Avi Kivity774c47f2007-02-12 00:54:47 -08002597static struct notifier_block kvm_cpu_notifier = {
2598 .notifier_call = kvm_cpu_hotplug,
Avi Kivity774c47f2007-02-12 00:54:47 -08002599};
2600
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002601static int vm_stat_get(void *_offset, u64 *val)
Avi Kivityba1389b2007-11-18 16:24:12 +02002602{
2603 unsigned offset = (long)_offset;
Avi Kivityba1389b2007-11-18 16:24:12 +02002604 struct kvm *kvm;
2605
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002606 *val = 0;
Jan Kiszkae935b832011-02-08 12:55:33 +01002607 raw_spin_lock(&kvm_lock);
Avi Kivityba1389b2007-11-18 16:24:12 +02002608 list_for_each_entry(kvm, &vm_list, vm_list)
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002609 *val += *(u32 *)((void *)kvm + offset);
Jan Kiszkae935b832011-02-08 12:55:33 +01002610 raw_spin_unlock(&kvm_lock);
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002611 return 0;
Avi Kivityba1389b2007-11-18 16:24:12 +02002612}
2613
2614DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2615
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002616static int vcpu_stat_get(void *_offset, u64 *val)
Avi Kivity1165f5f2007-04-19 17:27:43 +03002617{
2618 unsigned offset = (long)_offset;
Avi Kivity1165f5f2007-04-19 17:27:43 +03002619 struct kvm *kvm;
2620 struct kvm_vcpu *vcpu;
2621 int i;
2622
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002623 *val = 0;
Jan Kiszkae935b832011-02-08 12:55:33 +01002624 raw_spin_lock(&kvm_lock);
Avi Kivity1165f5f2007-04-19 17:27:43 +03002625 list_for_each_entry(kvm, &vm_list, vm_list)
Gleb Natapov988a2ca2009-06-09 15:56:29 +03002626 kvm_for_each_vcpu(i, vcpu, kvm)
2627 *val += *(u32 *)((void *)vcpu + offset);
2628
Jan Kiszkae935b832011-02-08 12:55:33 +01002629 raw_spin_unlock(&kvm_lock);
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002630 return 0;
Avi Kivity1165f5f2007-04-19 17:27:43 +03002631}
2632
Avi Kivityba1389b2007-11-18 16:24:12 +02002633DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2634
Alexey Dobriyan828c0952009-10-01 15:43:56 -07002635static const struct file_operations *stat_fops[] = {
Avi Kivityba1389b2007-11-18 16:24:12 +02002636 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2637 [KVM_STAT_VM] = &vm_stat_fops,
2638};
Avi Kivity1165f5f2007-04-19 17:27:43 +03002639
Hamo4f69b682011-12-15 14:23:16 +08002640static int kvm_init_debug(void)
Avi Kivity6aa8b732006-12-10 02:21:36 -08002641{
Hamo4f69b682011-12-15 14:23:16 +08002642 int r = -EFAULT;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002643 struct kvm_stats_debugfs_item *p;
2644
Hollis Blanchard76f7c872008-04-15 16:05:42 -05002645 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
Hamo4f69b682011-12-15 14:23:16 +08002646 if (kvm_debugfs_dir == NULL)
2647 goto out;
2648
2649 for (p = debugfs_entries; p->name; ++p) {
Hollis Blanchard76f7c872008-04-15 16:05:42 -05002650 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
Avi Kivity1165f5f2007-04-19 17:27:43 +03002651 (void *)(long)p->offset,
Avi Kivityba1389b2007-11-18 16:24:12 +02002652 stat_fops[p->kind]);
Hamo4f69b682011-12-15 14:23:16 +08002653 if (p->dentry == NULL)
2654 goto out_dir;
2655 }
2656
2657 return 0;
2658
2659out_dir:
2660 debugfs_remove_recursive(kvm_debugfs_dir);
2661out:
2662 return r;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002663}
2664
2665static void kvm_exit_debug(void)
2666{
2667 struct kvm_stats_debugfs_item *p;
2668
2669 for (p = debugfs_entries; p->name; ++p)
2670 debugfs_remove(p->dentry);
Hollis Blanchard76f7c872008-04-15 16:05:42 -05002671 debugfs_remove(kvm_debugfs_dir);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002672}
2673
Rafael J. Wysockifb3600c2011-03-23 22:16:23 +01002674static int kvm_suspend(void)
Avi Kivity59ae6c62007-02-12 00:54:48 -08002675{
Alexander Graf10474ae2009-09-15 11:37:46 +02002676 if (kvm_usage_count)
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002677 hardware_disable_nolock(NULL);
Avi Kivity59ae6c62007-02-12 00:54:48 -08002678 return 0;
2679}
2680
Rafael J. Wysockifb3600c2011-03-23 22:16:23 +01002681static void kvm_resume(void)
Avi Kivity59ae6c62007-02-12 00:54:48 -08002682{
Zachary Amsdenca84d1a2010-08-19 22:07:28 -10002683 if (kvm_usage_count) {
Jan Kiszkae935b832011-02-08 12:55:33 +01002684 WARN_ON(raw_spin_is_locked(&kvm_lock));
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002685 hardware_enable_nolock(NULL);
Zachary Amsdenca84d1a2010-08-19 22:07:28 -10002686 }
Avi Kivity59ae6c62007-02-12 00:54:48 -08002687}
2688
Rafael J. Wysockifb3600c2011-03-23 22:16:23 +01002689static struct syscore_ops kvm_syscore_ops = {
Avi Kivity59ae6c62007-02-12 00:54:48 -08002690 .suspend = kvm_suspend,
2691 .resume = kvm_resume,
2692};
2693
Izik Eiduscea7bb22007-10-17 19:17:48 +02002694struct page *bad_page;
Anthony Liguori35149e22008-04-02 14:46:56 -05002695pfn_t bad_pfn;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002696
Avi Kivity15ad7142007-07-11 18:17:21 +03002697static inline
2698struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2699{
2700 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2701}
2702
2703static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2704{
2705 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2706
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002707 kvm_arch_vcpu_load(vcpu, cpu);
Avi Kivity15ad7142007-07-11 18:17:21 +03002708}
2709
2710static void kvm_sched_out(struct preempt_notifier *pn,
2711 struct task_struct *next)
2712{
2713 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2714
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002715 kvm_arch_vcpu_put(vcpu);
Avi Kivity15ad7142007-07-11 18:17:21 +03002716}
2717
Avi Kivity0ee75be2010-04-28 15:39:01 +03002718int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
Rusty Russellc16f8622007-07-30 21:12:19 +10002719 struct module *module)
Avi Kivity6aa8b732006-12-10 02:21:36 -08002720{
2721 int r;
Yang, Sheng002c7f72007-07-31 14:23:01 +03002722 int cpu;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002723
Zhang Xiantaof8c16bb2007-11-14 20:40:21 +08002724 r = kvm_arch_init(opaque);
2725 if (r)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002726 goto out_fail;
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002727
2728 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2729
2730 if (bad_page == NULL) {
2731 r = -ENOMEM;
2732 goto out;
2733 }
2734
Anthony Liguori35149e22008-04-02 14:46:56 -05002735 bad_pfn = page_to_pfn(bad_page);
2736
Huang Yingbf998152010-05-31 14:28:19 +08002737 hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2738
2739 if (hwpoison_page == NULL) {
2740 r = -ENOMEM;
2741 goto out_free_0;
2742 }
2743
2744 hwpoison_pfn = page_to_pfn(hwpoison_page);
2745
Gleb Natapovedba23e2010-07-07 20:16:45 +03002746 fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2747
2748 if (fault_page == NULL) {
2749 r = -ENOMEM;
2750 goto out_free_0;
2751 }
2752
2753 fault_pfn = page_to_pfn(fault_page);
2754
Avi Kivity8437a612009-06-06 14:52:35 -07002755 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
Rusty Russell7f59f492008-12-07 21:25:45 +10302756 r = -ENOMEM;
2757 goto out_free_0;
2758 }
2759
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002760 r = kvm_arch_hardware_setup();
Avi Kivity6aa8b732006-12-10 02:21:36 -08002761 if (r < 0)
Rusty Russell7f59f492008-12-07 21:25:45 +10302762 goto out_free_0a;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002763
Yang, Sheng002c7f72007-07-31 14:23:01 +03002764 for_each_online_cpu(cpu) {
2765 smp_call_function_single(cpu,
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002766 kvm_arch_check_processor_compat,
Jens Axboe8691e5a2008-06-06 11:18:06 +02002767 &r, 1);
Yang, Sheng002c7f72007-07-31 14:23:01 +03002768 if (r < 0)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002769 goto out_free_1;
Yang, Sheng002c7f72007-07-31 14:23:01 +03002770 }
2771
Avi Kivity774c47f2007-02-12 00:54:47 -08002772 r = register_cpu_notifier(&kvm_cpu_notifier);
2773 if (r)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002774 goto out_free_2;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002775 register_reboot_notifier(&kvm_reboot_notifier);
2776
Rusty Russellc16f8622007-07-30 21:12:19 +10002777 /* A kmem cache lets us meet the alignment requirements of fx_save. */
Avi Kivity0ee75be2010-04-28 15:39:01 +03002778 if (!vcpu_align)
2779 vcpu_align = __alignof__(struct kvm_vcpu);
2780 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
Joe Perches56919c52007-11-12 20:06:51 -08002781 0, NULL);
Rusty Russellc16f8622007-07-30 21:12:19 +10002782 if (!kvm_vcpu_cache) {
2783 r = -ENOMEM;
Rafael J. Wysockifb3600c2011-03-23 22:16:23 +01002784 goto out_free_3;
Rusty Russellc16f8622007-07-30 21:12:19 +10002785 }
2786
Gleb Natapovaf585b92010-10-14 11:22:46 +02002787 r = kvm_async_pf_init();
2788 if (r)
2789 goto out_free;
2790
Avi Kivity6aa8b732006-12-10 02:21:36 -08002791 kvm_chardev_ops.owner = module;
Christian Borntraeger3d3aab12008-12-02 11:17:32 +01002792 kvm_vm_fops.owner = module;
2793 kvm_vcpu_fops.owner = module;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002794
2795 r = misc_register(&kvm_dev);
2796 if (r) {
Mike Dayd77c26f2007-10-08 09:02:08 -04002797 printk(KERN_ERR "kvm: misc device register failed\n");
Gleb Natapovaf585b92010-10-14 11:22:46 +02002798 goto out_unreg;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002799 }
2800
Rafael J. Wysockifb3600c2011-03-23 22:16:23 +01002801 register_syscore_ops(&kvm_syscore_ops);
2802
Avi Kivity15ad7142007-07-11 18:17:21 +03002803 kvm_preempt_ops.sched_in = kvm_sched_in;
2804 kvm_preempt_ops.sched_out = kvm_sched_out;
2805
Hamo4f69b682011-12-15 14:23:16 +08002806 r = kvm_init_debug();
2807 if (r) {
2808 printk(KERN_ERR "kvm: create debugfs files failed\n");
2809 goto out_undebugfs;
2810 }
Darrick J. Wong0ea4ed82009-10-14 16:21:00 -07002811
Avi Kivityc7addb92007-09-16 18:58:32 +02002812 return 0;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002813
Hamo4f69b682011-12-15 14:23:16 +08002814out_undebugfs:
2815 unregister_syscore_ops(&kvm_syscore_ops);
Gleb Natapovaf585b92010-10-14 11:22:46 +02002816out_unreg:
2817 kvm_async_pf_deinit();
Avi Kivity6aa8b732006-12-10 02:21:36 -08002818out_free:
Rusty Russellc16f8622007-07-30 21:12:19 +10002819 kmem_cache_destroy(kvm_vcpu_cache);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002820out_free_3:
Avi Kivity6aa8b732006-12-10 02:21:36 -08002821 unregister_reboot_notifier(&kvm_reboot_notifier);
Avi Kivity774c47f2007-02-12 00:54:47 -08002822 unregister_cpu_notifier(&kvm_cpu_notifier);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002823out_free_2:
Zhang Xiantaod23087842007-11-29 15:35:39 +08002824out_free_1:
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002825 kvm_arch_hardware_unsetup();
Rusty Russell7f59f492008-12-07 21:25:45 +10302826out_free_0a:
2827 free_cpumask_var(cpus_hardware_enabled);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002828out_free_0:
Gleb Natapovedba23e2010-07-07 20:16:45 +03002829 if (fault_page)
2830 __free_page(fault_page);
Huang Yingbf998152010-05-31 14:28:19 +08002831 if (hwpoison_page)
2832 __free_page(hwpoison_page);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002833 __free_page(bad_page);
Avi Kivityca45aaa2007-03-01 19:21:03 +02002834out:
Zhang Xiantaof8c16bb2007-11-14 20:40:21 +08002835 kvm_arch_exit();
Zhang Xiantaod23087842007-11-29 15:35:39 +08002836out_fail:
Avi Kivity6aa8b732006-12-10 02:21:36 -08002837 return r;
2838}
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002839EXPORT_SYMBOL_GPL(kvm_init);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002840
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002841void kvm_exit(void)
Avi Kivity6aa8b732006-12-10 02:21:36 -08002842{
Darrick J. Wong0ea4ed82009-10-14 16:21:00 -07002843 kvm_exit_debug();
Avi Kivity6aa8b732006-12-10 02:21:36 -08002844 misc_deregister(&kvm_dev);
Rusty Russellc16f8622007-07-30 21:12:19 +10002845 kmem_cache_destroy(kvm_vcpu_cache);
Gleb Natapovaf585b92010-10-14 11:22:46 +02002846 kvm_async_pf_deinit();
Rafael J. Wysockifb3600c2011-03-23 22:16:23 +01002847 unregister_syscore_ops(&kvm_syscore_ops);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002848 unregister_reboot_notifier(&kvm_reboot_notifier);
Avi Kivity59ae6c62007-02-12 00:54:48 -08002849 unregister_cpu_notifier(&kvm_cpu_notifier);
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002850 on_each_cpu(hardware_disable_nolock, NULL, 1);
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002851 kvm_arch_hardware_unsetup();
Zhang Xiantaof8c16bb2007-11-14 20:40:21 +08002852 kvm_arch_exit();
Rusty Russell7f59f492008-12-07 21:25:45 +10302853 free_cpumask_var(cpus_hardware_enabled);
Huang Yingbf998152010-05-31 14:28:19 +08002854 __free_page(hwpoison_page);
Izik Eiduscea7bb22007-10-17 19:17:48 +02002855 __free_page(bad_page);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002856}
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002857EXPORT_SYMBOL_GPL(kvm_exit);