blob: 415fe816fc154b8748a58343a4f7c76216cdc556 [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 Guangrongfce92dc2011-07-12 03:28:54 +0800106struct page *fault_page;
107pfn_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{
Xiao Guangronga4ee1ca2010-11-23 11:13:00 +0800206 int dirty_count = kvm->tlbs_dirty;
207
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);
292 kvm->mmu_notifier_seq++;
Xiao Guangronga4ee1ca2010-11-23 11:13:00 +0800293 need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200294 spin_unlock(&kvm->mmu_lock);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200295 srcu_read_unlock(&kvm->srcu, idx);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200296
297 /* we've to flush the tlb before the pages can be freed */
298 if (need_tlb_flush)
299 kvm_flush_remote_tlbs(kvm);
300
301}
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++;
335 for (; start < end; start += PAGE_SIZE)
336 need_tlb_flush |= kvm_unmap_hva(kvm, start);
Xiao Guangronga4ee1ca2010-11-23 11:13:00 +0800337 need_tlb_flush |= kvm->tlbs_dirty;
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200338 spin_unlock(&kvm->mmu_lock);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200339 srcu_read_unlock(&kvm->srcu, idx);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200340
341 /* we've to flush the tlb before the pages can be freed */
342 if (need_tlb_flush)
343 kvm_flush_remote_tlbs(kvm);
344}
345
346static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
347 struct mm_struct *mm,
348 unsigned long start,
349 unsigned long end)
350{
351 struct kvm *kvm = mmu_notifier_to_kvm(mn);
352
353 spin_lock(&kvm->mmu_lock);
354 /*
355 * This sequence increase will notify the kvm page fault that
356 * the page that is going to be mapped in the spte could have
357 * been freed.
358 */
359 kvm->mmu_notifier_seq++;
Paul Mackerrasa355aa52011-12-12 12:37:21 +0000360 smp_wmb();
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200361 /*
362 * The above sequence increase must be visible before the
Paul Mackerrasa355aa52011-12-12 12:37:21 +0000363 * below count decrease, which is ensured by the smp_wmb above
364 * in conjunction with the smp_rmb in mmu_notifier_retry().
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200365 */
366 kvm->mmu_notifier_count--;
367 spin_unlock(&kvm->mmu_lock);
368
369 BUG_ON(kvm->mmu_notifier_count < 0);
370}
371
372static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
373 struct mm_struct *mm,
374 unsigned long address)
375{
376 struct kvm *kvm = mmu_notifier_to_kvm(mn);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200377 int young, idx;
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200378
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200379 idx = srcu_read_lock(&kvm->srcu);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200380 spin_lock(&kvm->mmu_lock);
381 young = kvm_age_hva(kvm, address);
382 spin_unlock(&kvm->mmu_lock);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200383 srcu_read_unlock(&kvm->srcu, idx);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200384
385 if (young)
386 kvm_flush_remote_tlbs(kvm);
387
388 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 Yoshikawaa36a57b12010-10-27 18:22:19 +0900518static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
519{
520 if (!memslot->dirty_bitmap)
521 return;
522
Takuya Yoshikawa6f9e5c172010-11-01 14:36:09 +0900523 if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE)
524 vfree(memslot->dirty_bitmap_head);
525 else
526 kfree(memslot->dirty_bitmap_head);
527
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900528 memslot->dirty_bitmap = NULL;
Takuya Yoshikawa515a0122010-10-27 18:23:54 +0900529 memslot->dirty_bitmap_head = NULL;
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900530}
531
Avi Kivity6aa8b732006-12-10 02:21:36 -0800532/*
533 * Free any memory in @free but not in @dont.
534 */
535static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
536 struct kvm_memory_slot *dont)
537{
Joerg Roedelec04b262009-06-19 15:16:23 +0200538 int i;
539
Izik Eidus290fc382007-09-27 14:11:22 +0200540 if (!dont || free->rmap != dont->rmap)
541 vfree(free->rmap);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800542
543 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900544 kvm_destroy_dirty_bitmap(free);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800545
Joerg Roedelec04b262009-06-19 15:16:23 +0200546
547 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
548 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
549 vfree(free->lpage_info[i]);
550 free->lpage_info[i] = NULL;
551 }
552 }
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300553
Avi Kivity6aa8b732006-12-10 02:21:36 -0800554 free->npages = 0;
Anthony Liguori8d4e1282007-10-18 09:59:34 -0500555 free->rmap = NULL;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800556}
557
Zhang Xiantaod19a9cd2007-11-18 18:43:45 +0800558void kvm_free_physmem(struct kvm *kvm)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800559{
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200560 struct kvm_memslots *slots = kvm->memslots;
Xiao Guangrongbe6ba0f2011-11-24 17:39:18 +0800561 struct kvm_memory_slot *memslot;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800562
Xiao Guangrongbe6ba0f2011-11-24 17:39:18 +0800563 kvm_for_each_memslot(memslot, slots)
564 kvm_free_physmem_slot(memslot, NULL);
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200565
566 kfree(kvm->memslots);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800567}
568
Avi Kivityf17abe92007-02-21 19:28:04 +0200569static void kvm_destroy_vm(struct kvm *kvm)
570{
Marcelo Tosattie93f8a02009-12-23 14:35:24 -0200571 int i;
Avi Kivity6d4e4c42007-11-21 16:41:05 +0200572 struct mm_struct *mm = kvm->mm;
573
Sheng Yangad8ba2c2009-01-06 10:03:02 +0800574 kvm_arch_sync_events(kvm);
Jan Kiszkae935b832011-02-08 12:55:33 +0100575 raw_spin_lock(&kvm_lock);
Avi Kivity133de902007-02-12 00:54:44 -0800576 list_del(&kvm->vm_list);
Jan Kiszkae935b832011-02-08 12:55:33 +0100577 raw_spin_unlock(&kvm_lock);
Avi Kivity399ec802008-11-19 13:58:46 +0200578 kvm_free_irq_routing(kvm);
Marcelo Tosattie93f8a02009-12-23 14:35:24 -0200579 for (i = 0; i < KVM_NR_BUSES; i++)
580 kvm_io_bus_destroy(kvm->buses[i]);
Avi Kivity980da6c2009-12-20 15:13:43 +0200581 kvm_coalesced_mmio_free(kvm);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200582#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
583 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
Gleb Natapovf00be0c2009-03-19 12:20:36 +0200584#else
585 kvm_arch_flush_shadow(kvm);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200586#endif
Zhang Xiantaod19a9cd2007-11-18 18:43:45 +0800587 kvm_arch_destroy_vm(kvm);
Jan Kiszkad89f5ef2010-11-09 17:02:49 +0100588 kvm_free_physmem(kvm);
589 cleanup_srcu_struct(&kvm->srcu);
590 kvm_arch_free_vm(kvm);
Alexander Graf10474ae2009-09-15 11:37:46 +0200591 hardware_disable_all();
Avi Kivity6d4e4c42007-11-21 16:41:05 +0200592 mmdrop(mm);
Avi Kivityf17abe92007-02-21 19:28:04 +0200593}
594
Izik Eidusd39f13b2008-03-30 16:01:25 +0300595void kvm_get_kvm(struct kvm *kvm)
596{
597 atomic_inc(&kvm->users_count);
598}
599EXPORT_SYMBOL_GPL(kvm_get_kvm);
600
601void kvm_put_kvm(struct kvm *kvm)
602{
603 if (atomic_dec_and_test(&kvm->users_count))
604 kvm_destroy_vm(kvm);
605}
606EXPORT_SYMBOL_GPL(kvm_put_kvm);
607
608
Avi Kivityf17abe92007-02-21 19:28:04 +0200609static int kvm_vm_release(struct inode *inode, struct file *filp)
610{
611 struct kvm *kvm = filp->private_data;
612
Gregory Haskins721eecbf2009-05-20 10:30:49 -0400613 kvm_irqfd_release(kvm);
614
Izik Eidusd39f13b2008-03-30 16:01:25 +0300615 kvm_put_kvm(kvm);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800616 return 0;
617}
618
Heiko Carstensd48ead82011-01-17 21:21:08 +0100619#ifndef CONFIG_S390
Takuya Yoshikawa515a0122010-10-27 18:23:54 +0900620/*
621 * Allocation size is twice as large as the actual dirty bitmap size.
622 * This makes it possible to do double buffering: see x86's
623 * kvm_vm_ioctl_get_dirty_log().
624 */
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900625static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
626{
Takuya Yoshikawa515a0122010-10-27 18:23:54 +0900627 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900628
Takuya Yoshikawa6f9e5c172010-11-01 14:36:09 +0900629 if (dirty_bytes > PAGE_SIZE)
630 memslot->dirty_bitmap = vzalloc(dirty_bytes);
631 else
632 memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL);
633
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900634 if (!memslot->dirty_bitmap)
635 return -ENOMEM;
636
Takuya Yoshikawa515a0122010-10-27 18:23:54 +0900637 memslot->dirty_bitmap_head = memslot->dirty_bitmap;
Takuya Yoshikawa7850ac52011-11-14 18:23:34 +0900638 memslot->nr_dirty_pages = 0;
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900639 return 0;
640}
Heiko Carstensd48ead82011-01-17 21:21:08 +0100641#endif /* !CONFIG_S390 */
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900642
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 */
Carsten Otteeff01142008-06-27 15:05:31 +0200768#ifndef CONFIG_S390
Anthony Liguori8d4e1282007-10-18 09:59:34 -0500769 if (npages && !new.rmap) {
Takuya Yoshikawa26535032010-11-02 10:49:34 +0900770 new.rmap = vzalloc(npages * sizeof(*new.rmap));
Izik Eidus290fc382007-09-27 14:11:22 +0200771
772 if (!new.rmap)
Sheng Yangf78e0e22007-10-29 09:40:42 +0800773 goto out_free;
Izik Eidus290fc382007-09-27 14:11:22 +0200774
Izik Eidus80b14b52007-10-25 11:54:04 +0200775 new.user_alloc = user_alloc;
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200776 new.userspace_addr = mem->userspace_addr;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800777 }
Joerg Roedelec04b262009-06-19 15:16:23 +0200778 if (!npages)
779 goto skip_lpage;
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300780
Joerg Roedelec04b262009-06-19 15:16:23 +0200781 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
Heiko Carstens28bcb112009-09-03 17:35:35 +0200782 unsigned long ugfn;
783 unsigned long j;
784 int lpages;
Joerg Roedelec04b262009-06-19 15:16:23 +0200785 int level = i + 2;
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300786
Joerg Roedelec04b262009-06-19 15:16:23 +0200787 if (new.lpage_info[i])
788 continue;
789
Takuya Yoshikawafb03cb62012-02-08 12:59:10 +0900790 lpages = gfn_to_index(base_gfn + npages - 1, base_gfn, level) + 1;
Joerg Roedelec04b262009-06-19 15:16:23 +0200791
Takuya Yoshikawa26535032010-11-02 10:49:34 +0900792 new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i]));
Joerg Roedelec04b262009-06-19 15:16:23 +0200793
794 if (!new.lpage_info[i])
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300795 goto out_free;
796
Joerg Roedel82855412010-07-01 16:00:11 +0200797 if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
Joerg Roedelec04b262009-06-19 15:16:23 +0200798 new.lpage_info[i][0].write_count = 1;
Joerg Roedel82855412010-07-01 16:00:11 +0200799 if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
Joerg Roedelec04b262009-06-19 15:16:23 +0200800 new.lpage_info[i][lpages - 1].write_count = 1;
Avi Kivityac045272009-06-08 15:52:39 +0300801 ugfn = new.userspace_addr >> PAGE_SHIFT;
802 /*
803 * If the gfn and userspace address are not aligned wrt each
Marcelo Tosatti54dee992009-06-11 12:07:44 -0300804 * other, or if explicitly asked to, disable large page
805 * support for this slot
Avi Kivityac045272009-06-08 15:52:39 +0300806 */
Joerg Roedelec04b262009-06-19 15:16:23 +0200807 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
Marcelo Tosatti54dee992009-06-11 12:07:44 -0300808 !largepages_enabled)
Joerg Roedelec04b262009-06-19 15:16:23 +0200809 for (j = 0; j < lpages; ++j)
810 new.lpage_info[i][j].write_count = 1;
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300811 }
Avi Kivity6aa8b732006-12-10 02:21:36 -0800812
Joerg Roedelec04b262009-06-19 15:16:23 +0200813skip_lpage:
814
Avi Kivity6aa8b732006-12-10 02:21:36 -0800815 /* Allocate page dirty bitmap if needed */
816 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
Takuya Yoshikawaa36a57b12010-10-27 18:22:19 +0900817 if (kvm_create_dirty_bitmap(&new) < 0)
Sheng Yangf78e0e22007-10-29 09:40:42 +0800818 goto out_free;
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200819 /* destroy any largepage mappings for dirty tracking */
Avi Kivity6aa8b732006-12-10 02:21:36 -0800820 }
Christian Borntraeger3eea8432009-06-23 17:24:06 +0200821#else /* not defined CONFIG_S390 */
822 new.user_alloc = user_alloc;
823 if (user_alloc)
824 new.userspace_addr = mem->userspace_addr;
Carsten Otteeff01142008-06-27 15:05:31 +0200825#endif /* not defined CONFIG_S390 */
Avi Kivity6aa8b732006-12-10 02:21:36 -0800826
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200827 if (!npages) {
Xiao Guangrong28a37542011-11-24 19:04:35 +0800828 struct kvm_memory_slot *slot;
829
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200830 r = -ENOMEM;
Thomas Meyer6da64fd2011-11-08 20:32:19 +0100831 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
832 GFP_KERNEL);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200833 if (!slots)
834 goto out_free;
Xiao Guangrong28a37542011-11-24 19:04:35 +0800835 slot = id_to_memslot(slots, mem->slot);
836 slot->flags |= KVM_MEMSLOT_INVALID;
837
Xiao Guangrongbe593d62011-11-24 17:38:24 +0800838 update_memslots(slots, NULL);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200839
840 old_memslots = kvm->memslots;
841 rcu_assign_pointer(kvm->memslots, slots);
842 synchronize_srcu_expedited(&kvm->srcu);
843 /* From this point no new shadow pages pointing to a deleted
844 * memslot will be created.
845 *
846 * validation of sp->gfn happens in:
847 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
848 * - kvm_is_visible_gfn (mmu_check_roots)
849 */
Marcelo Tosatti34d4cb82008-07-10 20:49:31 -0300850 kvm_arch_flush_shadow(kvm);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200851 kfree(old_memslots);
852 }
Marcelo Tosatti34d4cb82008-07-10 20:49:31 -0300853
Marcelo Tosattif7784b82009-12-23 14:35:18 -0200854 r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
855 if (r)
856 goto out_free;
857
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200858 /* map the pages in iommu page table */
859 if (npages) {
860 r = kvm_iommu_map_pages(kvm, &new);
861 if (r)
862 goto out_free;
863 }
Andrea Arcangeli604b38a2008-07-25 16:32:03 +0200864
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200865 r = -ENOMEM;
Thomas Meyer6da64fd2011-11-08 20:32:19 +0100866 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
867 GFP_KERNEL);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200868 if (!slots)
869 goto out_free;
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200870
871 /* actual memory is freed via old in kvm_free_physmem_slot below */
872 if (!npages) {
873 new.rmap = NULL;
874 new.dirty_bitmap = NULL;
875 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
876 new.lpage_info[i] = NULL;
877 }
878
Xiao Guangrongbe593d62011-11-24 17:38:24 +0800879 update_memslots(slots, &new);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200880 old_memslots = kvm->memslots;
881 rcu_assign_pointer(kvm->memslots, slots);
882 synchronize_srcu_expedited(&kvm->srcu);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800883
Marcelo Tosattif7784b82009-12-23 14:35:18 -0200884 kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
Zhang Xiantao3ad82a72007-11-20 13:11:38 +0800885
Xiao Guangrongce88dec2011-07-12 03:33:44 +0800886 /*
887 * If the new memory slot is created, we need to clear all
888 * mmio sptes.
889 */
890 if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT)
891 kvm_arch_flush_shadow(kvm);
892
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200893 kvm_free_physmem_slot(&old, &new);
894 kfree(old_memslots);
895
Avi Kivity6aa8b732006-12-10 02:21:36 -0800896 return 0;
897
Sheng Yangf78e0e22007-10-29 09:40:42 +0800898out_free:
Avi Kivity6aa8b732006-12-10 02:21:36 -0800899 kvm_free_physmem_slot(&new, &old);
900out:
901 return r;
Izik Eidus210c7c42007-10-24 23:52:57 +0200902
903}
Sheng Yangf78e0e22007-10-29 09:40:42 +0800904EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
905
906int kvm_set_memory_region(struct kvm *kvm,
907 struct kvm_userspace_memory_region *mem,
908 int user_alloc)
909{
910 int r;
911
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200912 mutex_lock(&kvm->slots_lock);
Sheng Yangf78e0e22007-10-29 09:40:42 +0800913 r = __kvm_set_memory_region(kvm, mem, user_alloc);
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200914 mutex_unlock(&kvm->slots_lock);
Sheng Yangf78e0e22007-10-29 09:40:42 +0800915 return r;
916}
Izik Eidus210c7c42007-10-24 23:52:57 +0200917EXPORT_SYMBOL_GPL(kvm_set_memory_region);
918
Carsten Otte1fe779f2007-10-29 16:08:35 +0100919int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
920 struct
921 kvm_userspace_memory_region *mem,
922 int user_alloc)
Izik Eidus210c7c42007-10-24 23:52:57 +0200923{
Izik Eiduse0d62c72007-10-24 23:57:46 +0200924 if (mem->slot >= KVM_MEMORY_SLOTS)
925 return -EINVAL;
Izik Eidus210c7c42007-10-24 23:52:57 +0200926 return kvm_set_memory_region(kvm, mem, user_alloc);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800927}
928
Zhang Xiantao5bb064d2007-11-18 20:29:43 +0800929int kvm_get_dirty_log(struct kvm *kvm,
930 struct kvm_dirty_log *log, int *is_dirty)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800931{
932 struct kvm_memory_slot *memslot;
933 int r, i;
Takuya Yoshikawa87bf6e72010-04-12 19:35:35 +0900934 unsigned long n;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800935 unsigned long any = 0;
936
Avi Kivity6aa8b732006-12-10 02:21:36 -0800937 r = -EINVAL;
938 if (log->slot >= KVM_MEMORY_SLOTS)
939 goto out;
940
Xiao Guangrong28a37542011-11-24 19:04:35 +0800941 memslot = id_to_memslot(kvm->memslots, log->slot);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800942 r = -ENOENT;
943 if (!memslot->dirty_bitmap)
944 goto out;
945
Takuya Yoshikawa87bf6e72010-04-12 19:35:35 +0900946 n = kvm_dirty_bitmap_bytes(memslot);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800947
Uri Lublincd1a4a92007-02-22 16:43:09 +0200948 for (i = 0; !any && i < n/sizeof(long); ++i)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800949 any = memslot->dirty_bitmap[i];
950
951 r = -EFAULT;
952 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
953 goto out;
954
Zhang Xiantao5bb064d2007-11-18 20:29:43 +0800955 if (any)
956 *is_dirty = 1;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800957
958 r = 0;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800959out:
Avi Kivity6aa8b732006-12-10 02:21:36 -0800960 return r;
961}
962
Marcelo Tosatti54dee992009-06-11 12:07:44 -0300963void kvm_disable_largepages(void)
964{
965 largepages_enabled = false;
966}
967EXPORT_SYMBOL_GPL(kvm_disable_largepages);
968
Izik Eiduscea7bb22007-10-17 19:17:48 +0200969int is_error_page(struct page *page)
970{
Gleb Natapovedba23e2010-07-07 20:16:45 +0300971 return page == bad_page || page == hwpoison_page || page == fault_page;
Izik Eiduscea7bb22007-10-17 19:17:48 +0200972}
973EXPORT_SYMBOL_GPL(is_error_page);
974
Anthony Liguori35149e22008-04-02 14:46:56 -0500975int is_error_pfn(pfn_t pfn)
976{
Gleb Natapovedba23e2010-07-07 20:16:45 +0300977 return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn;
Anthony Liguori35149e22008-04-02 14:46:56 -0500978}
979EXPORT_SYMBOL_GPL(is_error_pfn);
980
Huang Yingbf998152010-05-31 14:28:19 +0800981int is_hwpoison_pfn(pfn_t pfn)
982{
983 return pfn == hwpoison_pfn;
984}
985EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
986
Gleb Natapovedba23e2010-07-07 20:16:45 +0300987int is_fault_pfn(pfn_t pfn)
988{
989 return pfn == fault_pfn;
990}
991EXPORT_SYMBOL_GPL(is_fault_pfn);
992
Xiao Guangrongfce92dc2011-07-12 03:28:54 +0800993int is_noslot_pfn(pfn_t pfn)
994{
995 return pfn == bad_pfn;
996}
997EXPORT_SYMBOL_GPL(is_noslot_pfn);
998
999int is_invalid_pfn(pfn_t pfn)
1000{
1001 return pfn == hwpoison_pfn || pfn == fault_pfn;
1002}
1003EXPORT_SYMBOL_GPL(is_invalid_pfn);
1004
Izik Eidusf9d46eb2007-11-11 22:02:22 +02001005static inline unsigned long bad_hva(void)
1006{
1007 return PAGE_OFFSET;
1008}
1009
1010int kvm_is_error_hva(unsigned long addr)
1011{
1012 return addr == bad_hva();
1013}
1014EXPORT_SYMBOL_GPL(kvm_is_error_hva);
1015
Gleb Natapov49c77542010-10-18 15:22:23 +02001016struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1017{
1018 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1019}
Avi Kivitya1f4d3952010-06-21 11:44:20 +03001020EXPORT_SYMBOL_GPL(gfn_to_memslot);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001021
Izik Eiduse0d62c72007-10-24 23:57:46 +02001022int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1023{
Xiao Guangrongbf3e05b2011-11-24 17:40:57 +08001024 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
Izik Eiduse0d62c72007-10-24 23:57:46 +02001025
Xiao Guangrongbf3e05b2011-11-24 17:40:57 +08001026 if (!memslot || memslot->id >= KVM_MEMORY_SLOTS ||
1027 memslot->flags & KVM_MEMSLOT_INVALID)
1028 return 0;
Izik Eiduse0d62c72007-10-24 23:57:46 +02001029
Xiao Guangrongbf3e05b2011-11-24 17:40:57 +08001030 return 1;
Izik Eiduse0d62c72007-10-24 23:57:46 +02001031}
1032EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1033
Joerg Roedel8f0b1ab2010-01-28 12:37:56 +01001034unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1035{
1036 struct vm_area_struct *vma;
1037 unsigned long addr, size;
1038
1039 size = PAGE_SIZE;
1040
1041 addr = gfn_to_hva(kvm, gfn);
1042 if (kvm_is_error_hva(addr))
1043 return PAGE_SIZE;
1044
1045 down_read(&current->mm->mmap_sem);
1046 vma = find_vma(current->mm, addr);
1047 if (!vma)
1048 goto out;
1049
1050 size = vma_kernel_pagesize(vma);
1051
1052out:
1053 up_read(&current->mm->mmap_sem);
1054
1055 return size;
1056}
1057
Gleb Natapov49c77542010-10-18 15:22:23 +02001058static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
Xiao Guangrong48987782010-08-22 19:11:43 +08001059 gfn_t *nr_pages)
Izik Eidus539cb662007-11-11 22:05:04 +02001060{
Marcelo Tosattibc6678a2009-12-23 14:35:21 -02001061 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
Izik Eidus539cb662007-11-11 22:05:04 +02001062 return bad_hva();
Xiao Guangrong48987782010-08-22 19:11:43 +08001063
1064 if (nr_pages)
1065 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1066
Takuya Yoshikawaf5c98032010-02-25 11:33:19 +09001067 return gfn_to_hva_memslot(slot, gfn);
Izik Eidus539cb662007-11-11 22:05:04 +02001068}
Xiao Guangrong48987782010-08-22 19:11:43 +08001069
1070unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1071{
Gleb Natapov49c77542010-10-18 15:22:23 +02001072 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
Xiao Guangrong48987782010-08-22 19:11:43 +08001073}
Sheng Yang0d150292008-04-25 21:44:50 +08001074EXPORT_SYMBOL_GPL(gfn_to_hva);
Izik Eidus539cb662007-11-11 22:05:04 +02001075
Gleb Natapov80300892010-10-19 18:13:41 +02001076static pfn_t get_fault_pfn(void)
1077{
1078 get_page(fault_page);
1079 return fault_pfn;
1080}
1081
Gleb Natapov0857b9e2011-02-01 13:21:47 +02001082int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1083 unsigned long start, int write, struct page **page)
1084{
1085 int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1086
1087 if (write)
1088 flags |= FOLL_WRITE;
1089
1090 return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1091}
1092
Huang Yingfafc3db2011-01-30 11:15:49 +08001093static inline int check_user_page_hwpoison(unsigned long addr)
1094{
1095 int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1096
1097 rc = __get_user_pages(current, current->mm, addr, 1,
1098 flags, NULL, NULL, NULL);
1099 return rc == -EHWPOISON;
1100}
1101
Gleb Natapovaf585b92010-10-14 11:22:46 +02001102static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001103 bool *async, bool write_fault, bool *writable)
Avi Kivity954bbbc2007-03-30 14:02:32 +03001104{
Anthony Liguori8d4e1282007-10-18 09:59:34 -05001105 struct page *page[1];
Gleb Natapovaf585b92010-10-14 11:22:46 +02001106 int npages = 0;
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001107 pfn_t pfn;
Avi Kivity954bbbc2007-03-30 14:02:32 +03001108
Gleb Natapovaf585b92010-10-14 11:22:46 +02001109 /* we can do it either atomically or asynchronously, not both */
1110 BUG_ON(atomic && async);
1111
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001112 BUG_ON(!write_fault && !writable);
1113
1114 if (writable)
1115 *writable = true;
1116
Gleb Natapovaf585b92010-10-14 11:22:46 +02001117 if (atomic || async)
Xiao Guangrong887c08a2010-08-22 19:10:28 +08001118 npages = __get_user_pages_fast(addr, 1, 1, page);
Gleb Natapovaf585b92010-10-14 11:22:46 +02001119
1120 if (unlikely(npages != 1) && !atomic) {
Xiao Guangrong887c08a2010-08-22 19:10:28 +08001121 might_sleep();
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001122
1123 if (writable)
1124 *writable = write_fault;
1125
Gleb Natapov0857b9e2011-02-01 13:21:47 +02001126 if (async) {
1127 down_read(&current->mm->mmap_sem);
1128 npages = get_user_page_nowait(current, current->mm,
1129 addr, write_fault, page);
1130 up_read(&current->mm->mmap_sem);
1131 } else
1132 npages = get_user_pages_fast(addr, 1, write_fault,
1133 page);
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001134
1135 /* map read fault as writable if possible */
1136 if (unlikely(!write_fault) && npages == 1) {
1137 struct page *wpage[1];
1138
1139 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1140 if (npages == 1) {
1141 *writable = true;
1142 put_page(page[0]);
1143 page[0] = wpage[0];
1144 }
1145 npages = 1;
1146 }
Xiao Guangrong887c08a2010-08-22 19:10:28 +08001147 }
Izik Eidus539cb662007-11-11 22:05:04 +02001148
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001149 if (unlikely(npages != 1)) {
1150 struct vm_area_struct *vma;
Anthony Liguori8d4e1282007-10-18 09:59:34 -05001151
Xiao Guangrong887c08a2010-08-22 19:10:28 +08001152 if (atomic)
Gleb Natapov80300892010-10-19 18:13:41 +02001153 return get_fault_pfn();
Xiao Guangrong887c08a2010-08-22 19:10:28 +08001154
Huang Yingbbeb3402010-06-22 14:23:11 +08001155 down_read(&current->mm->mmap_sem);
Gleb Natapov0857b9e2011-02-01 13:21:47 +02001156 if (npages == -EHWPOISON ||
1157 (!async && check_user_page_hwpoison(addr))) {
Huang Yingbbeb3402010-06-22 14:23:11 +08001158 up_read(&current->mm->mmap_sem);
Huang Yingbf998152010-05-31 14:28:19 +08001159 get_page(hwpoison_page);
1160 return page_to_pfn(hwpoison_page);
1161 }
1162
Gleb Natapov80300892010-10-19 18:13:41 +02001163 vma = find_vma_intersection(current->mm, addr, addr+1);
Marcelo Tosatti4c2155c2008-09-16 20:54:47 -03001164
Gleb Natapov80300892010-10-19 18:13:41 +02001165 if (vma == NULL)
1166 pfn = get_fault_pfn();
1167 else if ((vma->vm_flags & VM_PFNMAP)) {
1168 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1169 vma->vm_pgoff;
1170 BUG_ON(!kvm_is_mmio_pfn(pfn));
1171 } else {
1172 if (async && (vma->vm_flags & VM_WRITE))
Gleb Natapovaf585b92010-10-14 11:22:46 +02001173 *async = true;
Gleb Natapov80300892010-10-19 18:13:41 +02001174 pfn = get_fault_pfn();
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001175 }
Marcelo Tosatti4c2155c2008-09-16 20:54:47 -03001176 up_read(&current->mm->mmap_sem);
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001177 } else
1178 pfn = page_to_pfn(page[0]);
1179
1180 return pfn;
Anthony Liguori35149e22008-04-02 14:46:56 -05001181}
1182
Xiao Guangrong887c08a2010-08-22 19:10:28 +08001183pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr)
1184{
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001185 return hva_to_pfn(kvm, addr, true, NULL, true, NULL);
Xiao Guangrong887c08a2010-08-22 19:10:28 +08001186}
1187EXPORT_SYMBOL_GPL(hva_to_pfn_atomic);
1188
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001189static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1190 bool write_fault, bool *writable)
Marcelo Tosatti506f0d62009-12-23 14:35:19 -02001191{
1192 unsigned long addr;
1193
Gleb Natapovaf585b92010-10-14 11:22:46 +02001194 if (async)
1195 *async = false;
1196
Marcelo Tosatti506f0d62009-12-23 14:35:19 -02001197 addr = gfn_to_hva(kvm, gfn);
1198 if (kvm_is_error_hva(addr)) {
1199 get_page(bad_page);
1200 return page_to_pfn(bad_page);
1201 }
1202
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001203 return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable);
Xiao Guangrong365fb3f2010-08-28 19:24:13 +08001204}
1205
1206pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1207{
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001208 return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
Xiao Guangrong365fb3f2010-08-28 19:24:13 +08001209}
1210EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1211
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001212pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1213 bool write_fault, bool *writable)
Gleb Natapovaf585b92010-10-14 11:22:46 +02001214{
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001215 return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
Gleb Natapovaf585b92010-10-14 11:22:46 +02001216}
1217EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1218
Xiao Guangrong365fb3f2010-08-28 19:24:13 +08001219pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1220{
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001221 return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
Marcelo Tosatti506f0d62009-12-23 14:35:19 -02001222}
Anthony Liguori35149e22008-04-02 14:46:56 -05001223EXPORT_SYMBOL_GPL(gfn_to_pfn);
1224
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001225pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1226 bool *writable)
1227{
1228 return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1229}
1230EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1231
Marcelo Tosatti506f0d62009-12-23 14:35:19 -02001232pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
1233 struct kvm_memory_slot *slot, gfn_t gfn)
1234{
1235 unsigned long addr = gfn_to_hva_memslot(slot, gfn);
Marcelo Tosatti612819c2010-10-22 14:18:18 -02001236 return hva_to_pfn(kvm, addr, false, NULL, true, NULL);
Marcelo Tosatti506f0d62009-12-23 14:35:19 -02001237}
1238
Xiao Guangrong48987782010-08-22 19:11:43 +08001239int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1240 int nr_pages)
1241{
1242 unsigned long addr;
1243 gfn_t entry;
1244
Gleb Natapov49c77542010-10-18 15:22:23 +02001245 addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
Xiao Guangrong48987782010-08-22 19:11:43 +08001246 if (kvm_is_error_hva(addr))
1247 return -1;
1248
1249 if (entry < nr_pages)
1250 return 0;
1251
1252 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1253}
1254EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1255
Anthony Liguori35149e22008-04-02 14:46:56 -05001256struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1257{
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001258 pfn_t pfn;
1259
1260 pfn = gfn_to_pfn(kvm, gfn);
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001261 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001262 return pfn_to_page(pfn);
1263
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001264 WARN_ON(kvm_is_mmio_pfn(pfn));
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001265
1266 get_page(bad_page);
1267 return bad_page;
Avi Kivity954bbbc2007-03-30 14:02:32 +03001268}
Anthony Liguoriaab61cc2007-10-29 15:15:20 -05001269
Avi Kivity954bbbc2007-03-30 14:02:32 +03001270EXPORT_SYMBOL_GPL(gfn_to_page);
1271
Izik Eidusb4231d62007-11-20 11:49:33 +02001272void kvm_release_page_clean(struct page *page)
1273{
Anthony Liguori35149e22008-04-02 14:46:56 -05001274 kvm_release_pfn_clean(page_to_pfn(page));
Izik Eidusb4231d62007-11-20 11:49:33 +02001275}
1276EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1277
Anthony Liguori35149e22008-04-02 14:46:56 -05001278void kvm_release_pfn_clean(pfn_t pfn)
1279{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001280 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001281 put_page(pfn_to_page(pfn));
Anthony Liguori35149e22008-04-02 14:46:56 -05001282}
1283EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1284
Izik Eidusb4231d62007-11-20 11:49:33 +02001285void kvm_release_page_dirty(struct page *page)
Izik Eidus8a7ae052007-10-18 11:09:33 +02001286{
Anthony Liguori35149e22008-04-02 14:46:56 -05001287 kvm_release_pfn_dirty(page_to_pfn(page));
Izik Eidus8a7ae052007-10-18 11:09:33 +02001288}
Izik Eidusb4231d62007-11-20 11:49:33 +02001289EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
Izik Eidus8a7ae052007-10-18 11:09:33 +02001290
Anthony Liguori35149e22008-04-02 14:46:56 -05001291void kvm_release_pfn_dirty(pfn_t pfn)
1292{
1293 kvm_set_pfn_dirty(pfn);
1294 kvm_release_pfn_clean(pfn);
1295}
1296EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1297
1298void kvm_set_page_dirty(struct page *page)
1299{
1300 kvm_set_pfn_dirty(page_to_pfn(page));
1301}
1302EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1303
1304void kvm_set_pfn_dirty(pfn_t pfn)
1305{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001306 if (!kvm_is_mmio_pfn(pfn)) {
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001307 struct page *page = pfn_to_page(pfn);
1308 if (!PageReserved(page))
1309 SetPageDirty(page);
1310 }
Anthony Liguori35149e22008-04-02 14:46:56 -05001311}
1312EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1313
1314void kvm_set_pfn_accessed(pfn_t pfn)
1315{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001316 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001317 mark_page_accessed(pfn_to_page(pfn));
Anthony Liguori35149e22008-04-02 14:46:56 -05001318}
1319EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1320
1321void kvm_get_pfn(pfn_t pfn)
1322{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001323 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001324 get_page(pfn_to_page(pfn));
Anthony Liguori35149e22008-04-02 14:46:56 -05001325}
1326EXPORT_SYMBOL_GPL(kvm_get_pfn);
1327
Izik Eidus195aefd2007-10-01 22:14:18 +02001328static int next_segment(unsigned long len, int offset)
1329{
1330 if (len > PAGE_SIZE - offset)
1331 return PAGE_SIZE - offset;
1332 else
1333 return len;
1334}
1335
1336int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1337 int len)
1338{
Izik Eiduse0506bc2007-11-11 22:10:22 +02001339 int r;
1340 unsigned long addr;
Izik Eidus195aefd2007-10-01 22:14:18 +02001341
Izik Eiduse0506bc2007-11-11 22:10:22 +02001342 addr = gfn_to_hva(kvm, gfn);
1343 if (kvm_is_error_hva(addr))
Izik Eidus195aefd2007-10-01 22:14:18 +02001344 return -EFAULT;
Takuya Yoshikawafa3d3152011-05-07 16:35:38 +09001345 r = __copy_from_user(data, (void __user *)addr + offset, len);
Izik Eiduse0506bc2007-11-11 22:10:22 +02001346 if (r)
1347 return -EFAULT;
Izik Eidus195aefd2007-10-01 22:14:18 +02001348 return 0;
1349}
1350EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1351
1352int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1353{
1354 gfn_t gfn = gpa >> PAGE_SHIFT;
1355 int seg;
1356 int offset = offset_in_page(gpa);
1357 int ret;
1358
1359 while ((seg = next_segment(len, offset)) != 0) {
1360 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1361 if (ret < 0)
1362 return ret;
1363 offset = 0;
1364 len -= seg;
1365 data += seg;
1366 ++gfn;
1367 }
1368 return 0;
1369}
1370EXPORT_SYMBOL_GPL(kvm_read_guest);
1371
Marcelo Tosatti7ec54582007-12-20 19:18:23 -05001372int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1373 unsigned long len)
1374{
1375 int r;
1376 unsigned long addr;
1377 gfn_t gfn = gpa >> PAGE_SHIFT;
1378 int offset = offset_in_page(gpa);
1379
1380 addr = gfn_to_hva(kvm, gfn);
1381 if (kvm_is_error_hva(addr))
1382 return -EFAULT;
Andrea Arcangeli0aac03f2008-01-30 19:57:35 +01001383 pagefault_disable();
Marcelo Tosatti7ec54582007-12-20 19:18:23 -05001384 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
Andrea Arcangeli0aac03f2008-01-30 19:57:35 +01001385 pagefault_enable();
Marcelo Tosatti7ec54582007-12-20 19:18:23 -05001386 if (r)
1387 return -EFAULT;
1388 return 0;
1389}
1390EXPORT_SYMBOL(kvm_read_guest_atomic);
1391
Izik Eidus195aefd2007-10-01 22:14:18 +02001392int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1393 int offset, int len)
1394{
Izik Eiduse0506bc2007-11-11 22:10:22 +02001395 int r;
1396 unsigned long addr;
Izik Eidus195aefd2007-10-01 22:14:18 +02001397
Izik Eiduse0506bc2007-11-11 22:10:22 +02001398 addr = gfn_to_hva(kvm, gfn);
1399 if (kvm_is_error_hva(addr))
Izik Eidus195aefd2007-10-01 22:14:18 +02001400 return -EFAULT;
Xiao Guangrong8b0cedf2011-05-15 23:22:04 +08001401 r = __copy_to_user((void __user *)addr + offset, data, len);
Izik Eiduse0506bc2007-11-11 22:10:22 +02001402 if (r)
1403 return -EFAULT;
Izik Eidus195aefd2007-10-01 22:14:18 +02001404 mark_page_dirty(kvm, gfn);
1405 return 0;
1406}
1407EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1408
1409int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1410 unsigned long len)
1411{
1412 gfn_t gfn = gpa >> PAGE_SHIFT;
1413 int seg;
1414 int offset = offset_in_page(gpa);
1415 int ret;
1416
1417 while ((seg = next_segment(len, offset)) != 0) {
1418 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1419 if (ret < 0)
1420 return ret;
1421 offset = 0;
1422 len -= seg;
1423 data += seg;
1424 ++gfn;
1425 }
1426 return 0;
1427}
1428
Gleb Natapov49c77542010-10-18 15:22:23 +02001429int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1430 gpa_t gpa)
1431{
1432 struct kvm_memslots *slots = kvm_memslots(kvm);
1433 int offset = offset_in_page(gpa);
1434 gfn_t gfn = gpa >> PAGE_SHIFT;
1435
1436 ghc->gpa = gpa;
1437 ghc->generation = slots->generation;
Paul Mackerras9d4cba72012-01-12 20:09:51 +00001438 ghc->memslot = gfn_to_memslot(kvm, gfn);
Gleb Natapov49c77542010-10-18 15:22:23 +02001439 ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
1440 if (!kvm_is_error_hva(ghc->hva))
1441 ghc->hva += offset;
1442 else
1443 return -EFAULT;
1444
1445 return 0;
1446}
1447EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1448
1449int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1450 void *data, unsigned long len)
1451{
1452 struct kvm_memslots *slots = kvm_memslots(kvm);
1453 int r;
1454
1455 if (slots->generation != ghc->generation)
1456 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1457
1458 if (kvm_is_error_hva(ghc->hva))
1459 return -EFAULT;
1460
Xiao Guangrong8b0cedf2011-05-15 23:22:04 +08001461 r = __copy_to_user((void __user *)ghc->hva, data, len);
Gleb Natapov49c77542010-10-18 15:22:23 +02001462 if (r)
1463 return -EFAULT;
1464 mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1465
1466 return 0;
1467}
1468EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1469
Gleb Natapove03b6442011-07-11 15:28:11 -04001470int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1471 void *data, unsigned long len)
1472{
1473 struct kvm_memslots *slots = kvm_memslots(kvm);
1474 int r;
1475
1476 if (slots->generation != ghc->generation)
1477 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1478
1479 if (kvm_is_error_hva(ghc->hva))
1480 return -EFAULT;
1481
1482 r = __copy_from_user(data, (void __user *)ghc->hva, len);
1483 if (r)
1484 return -EFAULT;
1485
1486 return 0;
1487}
1488EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1489
Izik Eidus195aefd2007-10-01 22:14:18 +02001490int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1491{
Heiko Carstens3bcc8a82010-10-27 17:21:21 +02001492 return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1493 offset, len);
Izik Eidus195aefd2007-10-01 22:14:18 +02001494}
1495EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1496
1497int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1498{
1499 gfn_t gfn = gpa >> PAGE_SHIFT;
1500 int seg;
1501 int offset = offset_in_page(gpa);
1502 int ret;
1503
1504 while ((seg = next_segment(len, offset)) != 0) {
1505 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1506 if (ret < 0)
1507 return ret;
1508 offset = 0;
1509 len -= seg;
1510 ++gfn;
1511 }
1512 return 0;
1513}
1514EXPORT_SYMBOL_GPL(kvm_clear_guest);
1515
Gleb Natapov49c77542010-10-18 15:22:23 +02001516void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1517 gfn_t gfn)
Avi Kivity6aa8b732006-12-10 02:21:36 -08001518{
Rusty Russell7e9d6192007-07-31 20:41:14 +10001519 if (memslot && memslot->dirty_bitmap) {
1520 unsigned long rel_gfn = gfn - memslot->base_gfn;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001521
Takuya Yoshikawa50e92b32012-01-04 15:06:43 +09001522 if (!test_and_set_bit_le(rel_gfn, memslot->dirty_bitmap))
Takuya Yoshikawa7850ac52011-11-14 18:23:34 +09001523 memslot->nr_dirty_pages++;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001524 }
1525}
1526
Gleb Natapov49c77542010-10-18 15:22:23 +02001527void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1528{
1529 struct kvm_memory_slot *memslot;
1530
1531 memslot = gfn_to_memslot(kvm, gfn);
1532 mark_page_dirty_in_slot(kvm, memslot, gfn);
1533}
1534
Eddie Dongb6958ce2007-07-18 12:15:21 +03001535/*
1536 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1537 */
Hollis Blanchard8776e512007-10-31 17:24:24 -05001538void kvm_vcpu_block(struct kvm_vcpu *vcpu)
Eddie Dongb6958ce2007-07-18 12:15:21 +03001539{
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001540 DEFINE_WAIT(wait);
Eddie Dongb6958ce2007-07-18 12:15:21 +03001541
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001542 for (;;) {
1543 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
Eddie Dongb6958ce2007-07-18 12:15:21 +03001544
Gleb Natapova1b37102009-07-09 15:33:52 +03001545 if (kvm_arch_vcpu_runnable(vcpu)) {
Avi Kivitya8eeb042010-05-10 12:34:53 +03001546 kvm_make_request(KVM_REQ_UNHALT, vcpu);
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001547 break;
Marcelo Tosattid7690172008-09-08 15:23:48 -03001548 }
Gleb Natapov09cec752009-03-23 15:11:44 +02001549 if (kvm_cpu_has_pending_timer(vcpu))
1550 break;
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001551 if (signal_pending(current))
1552 break;
1553
Eddie Dongb6958ce2007-07-18 12:15:21 +03001554 schedule();
Eddie Dongb6958ce2007-07-18 12:15:21 +03001555 }
1556
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001557 finish_wait(&vcpu->wq, &wait);
Eddie Dongb6958ce2007-07-18 12:15:21 +03001558}
1559
Avi Kivity6aa8b732006-12-10 02:21:36 -08001560void kvm_resched(struct kvm_vcpu *vcpu)
1561{
Yaozu Dong3fca0362007-04-25 16:49:19 +03001562 if (!need_resched())
1563 return;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001564 cond_resched();
Avi Kivity6aa8b732006-12-10 02:21:36 -08001565}
1566EXPORT_SYMBOL_GPL(kvm_resched);
1567
Rik van Riel217ece62011-02-01 09:53:28 -05001568void kvm_vcpu_on_spin(struct kvm_vcpu *me)
Zhai, Edwind255f4f2009-10-09 18:03:20 +08001569{
Rik van Riel217ece62011-02-01 09:53:28 -05001570 struct kvm *kvm = me->kvm;
1571 struct kvm_vcpu *vcpu;
1572 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
1573 int yielded = 0;
1574 int pass;
1575 int i;
Zhai, Edwind255f4f2009-10-09 18:03:20 +08001576
Rik van Riel217ece62011-02-01 09:53:28 -05001577 /*
1578 * We boost the priority of a VCPU that is runnable but not
1579 * currently running, because it got preempted by something
1580 * else and called schedule in __vcpu_run. Hopefully that
1581 * VCPU is holding the lock that we need and will release it.
1582 * We approximate round-robin by starting at the last boosted VCPU.
1583 */
1584 for (pass = 0; pass < 2 && !yielded; pass++) {
1585 kvm_for_each_vcpu(i, vcpu, kvm) {
1586 struct task_struct *task = NULL;
1587 struct pid *pid;
1588 if (!pass && i < last_boosted_vcpu) {
1589 i = last_boosted_vcpu;
1590 continue;
1591 } else if (pass && i > last_boosted_vcpu)
1592 break;
1593 if (vcpu == me)
1594 continue;
1595 if (waitqueue_active(&vcpu->wq))
1596 continue;
1597 rcu_read_lock();
1598 pid = rcu_dereference(vcpu->pid);
1599 if (pid)
1600 task = get_pid_task(vcpu->pid, PIDTYPE_PID);
1601 rcu_read_unlock();
1602 if (!task)
1603 continue;
1604 if (task->flags & PF_VCPU) {
1605 put_task_struct(task);
1606 continue;
1607 }
1608 if (yield_to(task, 1)) {
1609 put_task_struct(task);
1610 kvm->last_boosted_vcpu = i;
1611 yielded = 1;
1612 break;
1613 }
1614 put_task_struct(task);
1615 }
1616 }
Zhai, Edwind255f4f2009-10-09 18:03:20 +08001617}
1618EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1619
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001620static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001621{
1622 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001623 struct page *page;
1624
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001625 if (vmf->pgoff == 0)
Avi Kivity039576c2007-03-20 12:46:50 +02001626 page = virt_to_page(vcpu->run);
Avi Kivity09566762008-01-23 18:14:23 +02001627#ifdef CONFIG_X86
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001628 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
Zhang Xiantaoad312c72007-12-13 23:50:52 +08001629 page = virt_to_page(vcpu->arch.pio_data);
Avi Kivity09566762008-01-23 18:14:23 +02001630#endif
Laurent Vivier5f94c172008-05-30 16:05:54 +02001631#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1632 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1633 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1634#endif
Avi Kivity039576c2007-03-20 12:46:50 +02001635 else
Carsten Otte5b1c1492012-01-04 10:25:23 +01001636 return kvm_arch_vcpu_fault(vcpu, vmf);
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001637 get_page(page);
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001638 vmf->page = page;
1639 return 0;
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001640}
1641
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +04001642static const struct vm_operations_struct kvm_vcpu_vm_ops = {
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001643 .fault = kvm_vcpu_fault,
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001644};
1645
1646static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1647{
1648 vma->vm_ops = &kvm_vcpu_vm_ops;
1649 return 0;
1650}
1651
Avi Kivitybccf2152007-02-21 18:04:26 +02001652static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1653{
1654 struct kvm_vcpu *vcpu = filp->private_data;
1655
Al Viro66c0b392008-04-19 20:33:56 +01001656 kvm_put_kvm(vcpu->kvm);
Avi Kivitybccf2152007-02-21 18:04:26 +02001657 return 0;
1658}
1659
Christian Borntraeger3d3aab12008-12-02 11:17:32 +01001660static struct file_operations kvm_vcpu_fops = {
Avi Kivitybccf2152007-02-21 18:04:26 +02001661 .release = kvm_vcpu_release,
1662 .unlocked_ioctl = kvm_vcpu_ioctl,
Alexander Graf1dda6062011-06-08 02:45:37 +02001663#ifdef CONFIG_COMPAT
1664 .compat_ioctl = kvm_vcpu_compat_ioctl,
1665#endif
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001666 .mmap = kvm_vcpu_mmap,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001667 .llseek = noop_llseek,
Avi Kivitybccf2152007-02-21 18:04:26 +02001668};
1669
1670/*
1671 * Allocates an inode for the vcpu.
1672 */
1673static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1674{
Roland Dreier628ff7c2009-12-18 09:41:24 -08001675 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
Avi Kivitybccf2152007-02-21 18:04:26 +02001676}
1677
Avi Kivityc5ea7662007-02-20 18:41:05 +02001678/*
1679 * Creates some virtual cpus. Good luck creating more than one.
1680 */
Gleb Natapov73880c82009-06-09 15:56:28 +03001681static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
Avi Kivityc5ea7662007-02-20 18:41:05 +02001682{
1683 int r;
Gleb Natapov988a2ca2009-06-09 15:56:29 +03001684 struct kvm_vcpu *vcpu, *v;
Avi Kivityc5ea7662007-02-20 18:41:05 +02001685
Gleb Natapov73880c82009-06-09 15:56:28 +03001686 vcpu = kvm_arch_vcpu_create(kvm, id);
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001687 if (IS_ERR(vcpu))
1688 return PTR_ERR(vcpu);
Avi Kivityc5ea7662007-02-20 18:41:05 +02001689
Avi Kivity15ad7142007-07-11 18:17:21 +03001690 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1691
Avi Kivity26e52152007-11-20 15:30:24 +02001692 r = kvm_arch_vcpu_setup(vcpu);
1693 if (r)
Jan Kiszkad7805922011-05-23 10:33:05 +02001694 goto vcpu_destroy;
Avi Kivity26e52152007-11-20 15:30:24 +02001695
Shaohua Li11ec2802007-07-23 14:51:37 +08001696 mutex_lock(&kvm->lock);
Gleb Natapov73880c82009-06-09 15:56:28 +03001697 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1698 r = -EINVAL;
Jan Kiszkad7805922011-05-23 10:33:05 +02001699 goto unlock_vcpu_destroy;
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001700 }
Gleb Natapov73880c82009-06-09 15:56:28 +03001701
Gleb Natapov988a2ca2009-06-09 15:56:29 +03001702 kvm_for_each_vcpu(r, v, kvm)
1703 if (v->vcpu_id == id) {
Gleb Natapov73880c82009-06-09 15:56:28 +03001704 r = -EEXIST;
Jan Kiszkad7805922011-05-23 10:33:05 +02001705 goto unlock_vcpu_destroy;
Gleb Natapov73880c82009-06-09 15:56:28 +03001706 }
1707
1708 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001709
1710 /* Now it's all set up, let userspace reach it */
Al Viro66c0b392008-04-19 20:33:56 +01001711 kvm_get_kvm(kvm);
Avi Kivitybccf2152007-02-21 18:04:26 +02001712 r = create_vcpu_fd(vcpu);
Gleb Natapov73880c82009-06-09 15:56:28 +03001713 if (r < 0) {
1714 kvm_put_kvm(kvm);
Jan Kiszkad7805922011-05-23 10:33:05 +02001715 goto unlock_vcpu_destroy;
Gleb Natapov73880c82009-06-09 15:56:28 +03001716 }
1717
1718 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1719 smp_wmb();
1720 atomic_inc(&kvm->online_vcpus);
1721
Gleb Natapov73880c82009-06-09 15:56:28 +03001722 mutex_unlock(&kvm->lock);
Avi Kivitybccf2152007-02-21 18:04:26 +02001723 return r;
Avi Kivityc5ea7662007-02-20 18:41:05 +02001724
Jan Kiszkad7805922011-05-23 10:33:05 +02001725unlock_vcpu_destroy:
Glauber Costa7d8fece2008-09-17 23:16:59 -03001726 mutex_unlock(&kvm->lock);
Jan Kiszkad7805922011-05-23 10:33:05 +02001727vcpu_destroy:
Hollis Blanchardd40ccc62007-11-19 14:04:43 -06001728 kvm_arch_vcpu_destroy(vcpu);
Avi Kivityc5ea7662007-02-20 18:41:05 +02001729 return r;
1730}
1731
Avi Kivity1961d272007-03-05 19:46:05 +02001732static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1733{
1734 if (sigset) {
1735 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1736 vcpu->sigset_active = 1;
1737 vcpu->sigset = *sigset;
1738 } else
1739 vcpu->sigset_active = 0;
1740 return 0;
1741}
1742
Avi Kivitybccf2152007-02-21 18:04:26 +02001743static long kvm_vcpu_ioctl(struct file *filp,
1744 unsigned int ioctl, unsigned long arg)
Avi Kivity6aa8b732006-12-10 02:21:36 -08001745{
Avi Kivitybccf2152007-02-21 18:04:26 +02001746 struct kvm_vcpu *vcpu = filp->private_data;
Al Viro2f3669872007-02-09 16:38:35 +00001747 void __user *argp = (void __user *)arg;
Carsten Otte313a3dc2007-10-11 19:16:52 +02001748 int r;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001749 struct kvm_fpu *fpu = NULL;
1750 struct kvm_sregs *kvm_sregs = NULL;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001751
Avi Kivity6d4e4c42007-11-21 16:41:05 +02001752 if (vcpu->kvm->mm != current->mm)
1753 return -EIO;
Avi Kivity2122ff52010-05-13 11:25:04 +03001754
1755#if defined(CONFIG_S390) || defined(CONFIG_PPC)
1756 /*
1757 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1758 * so vcpu_load() would break it.
1759 */
1760 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1761 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1762#endif
1763
1764
1765 vcpu_load(vcpu);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001766 switch (ioctl) {
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001767 case KVM_RUN:
Avi Kivityf0fe5102007-03-07 13:11:17 +02001768 r = -EINVAL;
1769 if (arg)
1770 goto out;
Hollis Blanchardb6c7a5d2007-11-01 14:16:10 -05001771 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
Gleb Natapov64be5002010-10-24 16:49:08 +02001772 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001773 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001774 case KVM_GET_REGS: {
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001775 struct kvm_regs *kvm_regs;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001776
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001777 r = -ENOMEM;
1778 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1779 if (!kvm_regs)
1780 goto out;
1781 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001782 if (r)
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001783 goto out_free1;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001784 r = -EFAULT;
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001785 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1786 goto out_free1;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001787 r = 0;
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001788out_free1:
1789 kfree(kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001790 break;
1791 }
1792 case KVM_SET_REGS: {
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001793 struct kvm_regs *kvm_regs;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001794
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001795 r = -ENOMEM;
Sasha Levinff5c2c02011-12-04 19:36:29 +02001796 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
1797 if (IS_ERR(kvm_regs)) {
1798 r = PTR_ERR(kvm_regs);
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001799 goto out;
Sasha Levinff5c2c02011-12-04 19:36:29 +02001800 }
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001801 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001802 if (r)
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001803 goto out_free2;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001804 r = 0;
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001805out_free2:
1806 kfree(kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001807 break;
1808 }
1809 case KVM_GET_SREGS: {
Dave Hansenfa3795a2008-08-11 10:01:46 -07001810 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1811 r = -ENOMEM;
1812 if (!kvm_sregs)
1813 goto out;
1814 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001815 if (r)
1816 goto out;
1817 r = -EFAULT;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001818 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001819 goto out;
1820 r = 0;
1821 break;
1822 }
1823 case KVM_SET_SREGS: {
Sasha Levinff5c2c02011-12-04 19:36:29 +02001824 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
1825 if (IS_ERR(kvm_sregs)) {
1826 r = PTR_ERR(kvm_sregs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001827 goto out;
Sasha Levinff5c2c02011-12-04 19:36:29 +02001828 }
Dave Hansenfa3795a2008-08-11 10:01:46 -07001829 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001830 if (r)
1831 goto out;
1832 r = 0;
1833 break;
1834 }
Marcelo Tosatti62d9f0d2008-04-11 13:24:45 -03001835 case KVM_GET_MP_STATE: {
1836 struct kvm_mp_state mp_state;
1837
1838 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1839 if (r)
1840 goto out;
1841 r = -EFAULT;
1842 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1843 goto out;
1844 r = 0;
1845 break;
1846 }
1847 case KVM_SET_MP_STATE: {
1848 struct kvm_mp_state mp_state;
1849
1850 r = -EFAULT;
1851 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1852 goto out;
1853 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1854 if (r)
1855 goto out;
1856 r = 0;
1857 break;
1858 }
Avi Kivity6aa8b732006-12-10 02:21:36 -08001859 case KVM_TRANSLATE: {
1860 struct kvm_translation tr;
1861
1862 r = -EFAULT;
Al Viro2f3669872007-02-09 16:38:35 +00001863 if (copy_from_user(&tr, argp, sizeof tr))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001864 goto out;
Zhang Xiantao8b006792007-11-16 13:05:55 +08001865 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001866 if (r)
1867 goto out;
1868 r = -EFAULT;
Al Viro2f3669872007-02-09 16:38:35 +00001869 if (copy_to_user(argp, &tr, sizeof tr))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001870 goto out;
1871 r = 0;
1872 break;
1873 }
Jan Kiszkad0bfb942008-12-15 13:52:10 +01001874 case KVM_SET_GUEST_DEBUG: {
1875 struct kvm_guest_debug dbg;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001876
1877 r = -EFAULT;
Al Viro2f3669872007-02-09 16:38:35 +00001878 if (copy_from_user(&dbg, argp, sizeof dbg))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001879 goto out;
Jan Kiszkad0bfb942008-12-15 13:52:10 +01001880 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001881 if (r)
1882 goto out;
1883 r = 0;
1884 break;
1885 }
Avi Kivity1961d272007-03-05 19:46:05 +02001886 case KVM_SET_SIGNAL_MASK: {
1887 struct kvm_signal_mask __user *sigmask_arg = argp;
1888 struct kvm_signal_mask kvm_sigmask;
1889 sigset_t sigset, *p;
1890
1891 p = NULL;
1892 if (argp) {
1893 r = -EFAULT;
1894 if (copy_from_user(&kvm_sigmask, argp,
1895 sizeof kvm_sigmask))
1896 goto out;
1897 r = -EINVAL;
1898 if (kvm_sigmask.len != sizeof sigset)
1899 goto out;
1900 r = -EFAULT;
1901 if (copy_from_user(&sigset, sigmask_arg->sigset,
1902 sizeof sigset))
1903 goto out;
1904 p = &sigset;
1905 }
Andi Kleen376d41f2010-06-10 13:10:47 +02001906 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
Avi Kivity1961d272007-03-05 19:46:05 +02001907 break;
1908 }
Avi Kivityb8836732007-04-01 16:34:31 +03001909 case KVM_GET_FPU: {
Dave Hansenfa3795a2008-08-11 10:01:46 -07001910 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1911 r = -ENOMEM;
1912 if (!fpu)
1913 goto out;
1914 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
Avi Kivityb8836732007-04-01 16:34:31 +03001915 if (r)
1916 goto out;
1917 r = -EFAULT;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001918 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
Avi Kivityb8836732007-04-01 16:34:31 +03001919 goto out;
1920 r = 0;
1921 break;
1922 }
1923 case KVM_SET_FPU: {
Sasha Levinff5c2c02011-12-04 19:36:29 +02001924 fpu = memdup_user(argp, sizeof(*fpu));
1925 if (IS_ERR(fpu)) {
1926 r = PTR_ERR(fpu);
Avi Kivityb8836732007-04-01 16:34:31 +03001927 goto out;
Sasha Levinff5c2c02011-12-04 19:36:29 +02001928 }
Dave Hansenfa3795a2008-08-11 10:01:46 -07001929 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
Avi Kivityb8836732007-04-01 16:34:31 +03001930 if (r)
1931 goto out;
1932 r = 0;
1933 break;
1934 }
Avi Kivitybccf2152007-02-21 18:04:26 +02001935 default:
Carsten Otte313a3dc2007-10-11 19:16:52 +02001936 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
Avi Kivitybccf2152007-02-21 18:04:26 +02001937 }
1938out:
Avi Kivity2122ff52010-05-13 11:25:04 +03001939 vcpu_put(vcpu);
Dave Hansenfa3795a2008-08-11 10:01:46 -07001940 kfree(fpu);
1941 kfree(kvm_sregs);
Avi Kivitybccf2152007-02-21 18:04:26 +02001942 return r;
1943}
1944
Alexander Graf1dda6062011-06-08 02:45:37 +02001945#ifdef CONFIG_COMPAT
1946static long kvm_vcpu_compat_ioctl(struct file *filp,
1947 unsigned int ioctl, unsigned long arg)
1948{
1949 struct kvm_vcpu *vcpu = filp->private_data;
1950 void __user *argp = compat_ptr(arg);
1951 int r;
1952
1953 if (vcpu->kvm->mm != current->mm)
1954 return -EIO;
1955
1956 switch (ioctl) {
1957 case KVM_SET_SIGNAL_MASK: {
1958 struct kvm_signal_mask __user *sigmask_arg = argp;
1959 struct kvm_signal_mask kvm_sigmask;
1960 compat_sigset_t csigset;
1961 sigset_t sigset;
1962
1963 if (argp) {
1964 r = -EFAULT;
1965 if (copy_from_user(&kvm_sigmask, argp,
1966 sizeof kvm_sigmask))
1967 goto out;
1968 r = -EINVAL;
1969 if (kvm_sigmask.len != sizeof csigset)
1970 goto out;
1971 r = -EFAULT;
1972 if (copy_from_user(&csigset, sigmask_arg->sigset,
1973 sizeof csigset))
1974 goto out;
1975 }
1976 sigset_from_compat(&sigset, &csigset);
1977 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1978 break;
1979 }
1980 default:
1981 r = kvm_vcpu_ioctl(filp, ioctl, arg);
1982 }
1983
1984out:
1985 return r;
1986}
1987#endif
1988
Avi Kivitybccf2152007-02-21 18:04:26 +02001989static long kvm_vm_ioctl(struct file *filp,
1990 unsigned int ioctl, unsigned long arg)
1991{
1992 struct kvm *kvm = filp->private_data;
1993 void __user *argp = (void __user *)arg;
Carsten Otte1fe779f2007-10-29 16:08:35 +01001994 int r;
Avi Kivitybccf2152007-02-21 18:04:26 +02001995
Avi Kivity6d4e4c42007-11-21 16:41:05 +02001996 if (kvm->mm != current->mm)
1997 return -EIO;
Avi Kivitybccf2152007-02-21 18:04:26 +02001998 switch (ioctl) {
1999 case KVM_CREATE_VCPU:
2000 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2001 if (r < 0)
2002 goto out;
2003 break;
Izik Eidus6fc138d2007-10-09 19:20:39 +02002004 case KVM_SET_USER_MEMORY_REGION: {
2005 struct kvm_userspace_memory_region kvm_userspace_mem;
2006
2007 r = -EFAULT;
2008 if (copy_from_user(&kvm_userspace_mem, argp,
2009 sizeof kvm_userspace_mem))
2010 goto out;
2011
2012 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002013 if (r)
2014 goto out;
2015 break;
2016 }
2017 case KVM_GET_DIRTY_LOG: {
2018 struct kvm_dirty_log log;
2019
2020 r = -EFAULT;
Al Viro2f3669872007-02-09 16:38:35 +00002021 if (copy_from_user(&log, argp, sizeof log))
Avi Kivity6aa8b732006-12-10 02:21:36 -08002022 goto out;
Avi Kivity2c6f5df2007-02-20 18:27:58 +02002023 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002024 if (r)
2025 goto out;
2026 break;
2027 }
Laurent Vivier5f94c172008-05-30 16:05:54 +02002028#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2029 case KVM_REGISTER_COALESCED_MMIO: {
2030 struct kvm_coalesced_mmio_zone zone;
2031 r = -EFAULT;
2032 if (copy_from_user(&zone, argp, sizeof zone))
2033 goto out;
Laurent Vivier5f94c172008-05-30 16:05:54 +02002034 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2035 if (r)
2036 goto out;
2037 r = 0;
2038 break;
2039 }
2040 case KVM_UNREGISTER_COALESCED_MMIO: {
2041 struct kvm_coalesced_mmio_zone zone;
2042 r = -EFAULT;
2043 if (copy_from_user(&zone, argp, sizeof zone))
2044 goto out;
Laurent Vivier5f94c172008-05-30 16:05:54 +02002045 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2046 if (r)
2047 goto out;
2048 r = 0;
2049 break;
2050 }
2051#endif
Gregory Haskins721eecbf2009-05-20 10:30:49 -04002052 case KVM_IRQFD: {
2053 struct kvm_irqfd data;
2054
2055 r = -EFAULT;
2056 if (copy_from_user(&data, argp, sizeof data))
2057 goto out;
2058 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
2059 break;
2060 }
Gregory Haskinsd34e6b12009-07-07 17:08:49 -04002061 case KVM_IOEVENTFD: {
2062 struct kvm_ioeventfd data;
2063
2064 r = -EFAULT;
2065 if (copy_from_user(&data, argp, sizeof data))
2066 goto out;
2067 r = kvm_ioeventfd(kvm, &data);
2068 break;
2069 }
Gleb Natapov73880c82009-06-09 15:56:28 +03002070#ifdef CONFIG_KVM_APIC_ARCHITECTURE
2071 case KVM_SET_BOOT_CPU_ID:
2072 r = 0;
Marcelo Tosatti894a9c52009-06-23 15:05:14 -03002073 mutex_lock(&kvm->lock);
Gleb Natapov73880c82009-06-09 15:56:28 +03002074 if (atomic_read(&kvm->online_vcpus) != 0)
2075 r = -EBUSY;
2076 else
2077 kvm->bsp_vcpu_id = arg;
Marcelo Tosatti894a9c52009-06-23 15:05:14 -03002078 mutex_unlock(&kvm->lock);
Gleb Natapov73880c82009-06-09 15:56:28 +03002079 break;
2080#endif
Avi Kivityf17abe92007-02-21 19:28:04 +02002081 default:
Carsten Otte1fe779f2007-10-29 16:08:35 +01002082 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
Avi Kivitybfd99ff2009-08-26 14:57:50 +03002083 if (r == -ENOTTY)
2084 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
Avi Kivityf17abe92007-02-21 19:28:04 +02002085 }
2086out:
2087 return r;
2088}
2089
Arnd Bergmann6ff58942009-10-22 14:19:27 +02002090#ifdef CONFIG_COMPAT
2091struct compat_kvm_dirty_log {
2092 __u32 slot;
2093 __u32 padding1;
2094 union {
2095 compat_uptr_t dirty_bitmap; /* one bit per page */
2096 __u64 padding2;
2097 };
2098};
2099
2100static long kvm_vm_compat_ioctl(struct file *filp,
2101 unsigned int ioctl, unsigned long arg)
2102{
2103 struct kvm *kvm = filp->private_data;
2104 int r;
2105
2106 if (kvm->mm != current->mm)
2107 return -EIO;
2108 switch (ioctl) {
2109 case KVM_GET_DIRTY_LOG: {
2110 struct compat_kvm_dirty_log compat_log;
2111 struct kvm_dirty_log log;
2112
2113 r = -EFAULT;
2114 if (copy_from_user(&compat_log, (void __user *)arg,
2115 sizeof(compat_log)))
2116 goto out;
2117 log.slot = compat_log.slot;
2118 log.padding1 = compat_log.padding1;
2119 log.padding2 = compat_log.padding2;
2120 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2121
2122 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2123 if (r)
2124 goto out;
2125 break;
2126 }
2127 default:
2128 r = kvm_vm_ioctl(filp, ioctl, arg);
2129 }
2130
2131out:
2132 return r;
2133}
2134#endif
2135
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11002136static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Avi Kivityf17abe92007-02-21 19:28:04 +02002137{
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03002138 struct page *page[1];
2139 unsigned long addr;
2140 int npages;
2141 gfn_t gfn = vmf->pgoff;
Avi Kivityf17abe92007-02-21 19:28:04 +02002142 struct kvm *kvm = vma->vm_file->private_data;
Avi Kivityf17abe92007-02-21 19:28:04 +02002143
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03002144 addr = gfn_to_hva(kvm, gfn);
2145 if (kvm_is_error_hva(addr))
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11002146 return VM_FAULT_SIGBUS;
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03002147
2148 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2149 NULL);
2150 if (unlikely(npages != 1))
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11002151 return VM_FAULT_SIGBUS;
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03002152
2153 vmf->page = page[0];
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11002154 return 0;
Avi Kivityf17abe92007-02-21 19:28:04 +02002155}
2156
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +04002157static const struct vm_operations_struct kvm_vm_vm_ops = {
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11002158 .fault = kvm_vm_fault,
Avi Kivityf17abe92007-02-21 19:28:04 +02002159};
2160
2161static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2162{
2163 vma->vm_ops = &kvm_vm_vm_ops;
2164 return 0;
2165}
2166
Christian Borntraeger3d3aab12008-12-02 11:17:32 +01002167static struct file_operations kvm_vm_fops = {
Avi Kivityf17abe92007-02-21 19:28:04 +02002168 .release = kvm_vm_release,
2169 .unlocked_ioctl = kvm_vm_ioctl,
Arnd Bergmann6ff58942009-10-22 14:19:27 +02002170#ifdef CONFIG_COMPAT
2171 .compat_ioctl = kvm_vm_compat_ioctl,
2172#endif
Avi Kivityf17abe92007-02-21 19:28:04 +02002173 .mmap = kvm_vm_mmap,
Arnd Bergmann6038f372010-08-15 18:52:59 +02002174 .llseek = noop_llseek,
Avi Kivityf17abe92007-02-21 19:28:04 +02002175};
2176
Carsten Ottee08b9632012-01-04 10:25:20 +01002177static int kvm_dev_ioctl_create_vm(unsigned long type)
Avi Kivityf17abe92007-02-21 19:28:04 +02002178{
Heiko Carstensaac87632010-10-27 17:22:10 +02002179 int r;
Avi Kivityf17abe92007-02-21 19:28:04 +02002180 struct kvm *kvm;
2181
Carsten Ottee08b9632012-01-04 10:25:20 +01002182 kvm = kvm_create_vm(type);
Avi Kivityd6d28162007-06-28 08:38:16 -04002183 if (IS_ERR(kvm))
2184 return PTR_ERR(kvm);
Takuya Yoshikawa6ce5a092010-03-15 22:13:30 +09002185#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2186 r = kvm_coalesced_mmio_init(kvm);
2187 if (r < 0) {
2188 kvm_put_kvm(kvm);
2189 return r;
2190 }
2191#endif
Heiko Carstensaac87632010-10-27 17:22:10 +02002192 r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
2193 if (r < 0)
Al Viro66c0b392008-04-19 20:33:56 +01002194 kvm_put_kvm(kvm);
Avi Kivityf17abe92007-02-21 19:28:04 +02002195
Heiko Carstensaac87632010-10-27 17:22:10 +02002196 return r;
Avi Kivityf17abe92007-02-21 19:28:04 +02002197}
2198
Avi Kivity1a811b62008-12-08 18:25:27 +02002199static long kvm_dev_ioctl_check_extension_generic(long arg)
2200{
2201 switch (arg) {
Avi Kivityca9edae2008-12-08 18:29:29 +02002202 case KVM_CAP_USER_MEMORY:
Avi Kivity1a811b62008-12-08 18:25:27 +02002203 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
Jan Kiszka4cd481f2009-04-13 11:59:32 +02002204 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
Gleb Natapov73880c82009-06-09 15:56:28 +03002205#ifdef CONFIG_KVM_APIC_ARCHITECTURE
2206 case KVM_CAP_SET_BOOT_CPU_ID:
2207#endif
Avi Kivitya9c73992009-11-04 11:54:59 +02002208 case KVM_CAP_INTERNAL_ERROR_DATA:
Avi Kivity1a811b62008-12-08 18:25:27 +02002209 return 1;
Avi Kivity399ec802008-11-19 13:58:46 +02002210#ifdef CONFIG_HAVE_KVM_IRQCHIP
2211 case KVM_CAP_IRQ_ROUTING:
Sheng Yang36463142009-03-16 16:33:43 +08002212 return KVM_MAX_IRQ_ROUTES;
Avi Kivity399ec802008-11-19 13:58:46 +02002213#endif
Avi Kivity1a811b62008-12-08 18:25:27 +02002214 default:
2215 break;
2216 }
2217 return kvm_dev_ioctl_check_extension(arg);
2218}
2219
Avi Kivityf17abe92007-02-21 19:28:04 +02002220static long kvm_dev_ioctl(struct file *filp,
2221 unsigned int ioctl, unsigned long arg)
2222{
Avi Kivity07c45a32007-03-07 13:05:38 +02002223 long r = -EINVAL;
Avi Kivityf17abe92007-02-21 19:28:04 +02002224
2225 switch (ioctl) {
2226 case KVM_GET_API_VERSION:
Avi Kivityf0fe5102007-03-07 13:11:17 +02002227 r = -EINVAL;
2228 if (arg)
2229 goto out;
Avi Kivityf17abe92007-02-21 19:28:04 +02002230 r = KVM_API_VERSION;
2231 break;
2232 case KVM_CREATE_VM:
Carsten Ottee08b9632012-01-04 10:25:20 +01002233 r = kvm_dev_ioctl_create_vm(arg);
Avi Kivityf17abe92007-02-21 19:28:04 +02002234 break;
Zhang Xiantao018d00d2007-11-15 23:07:47 +08002235 case KVM_CHECK_EXTENSION:
Avi Kivity1a811b62008-12-08 18:25:27 +02002236 r = kvm_dev_ioctl_check_extension_generic(arg);
Avi Kivity5d308f42007-03-01 17:56:20 +02002237 break;
Avi Kivity07c45a32007-03-07 13:05:38 +02002238 case KVM_GET_VCPU_MMAP_SIZE:
2239 r = -EINVAL;
2240 if (arg)
2241 goto out;
Avi Kivityadb1ff42008-01-24 15:13:08 +02002242 r = PAGE_SIZE; /* struct kvm_run */
2243#ifdef CONFIG_X86
2244 r += PAGE_SIZE; /* pio data page */
2245#endif
Laurent Vivier5f94c172008-05-30 16:05:54 +02002246#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2247 r += PAGE_SIZE; /* coalesced mmio ring page */
2248#endif
Avi Kivity07c45a32007-03-07 13:05:38 +02002249 break;
Feng(Eric) Liud4c9ff22008-04-10 08:47:53 -04002250 case KVM_TRACE_ENABLE:
2251 case KVM_TRACE_PAUSE:
2252 case KVM_TRACE_DISABLE:
Marcelo Tosatti2023a292009-06-18 11:47:28 -03002253 r = -EOPNOTSUPP;
Feng(Eric) Liud4c9ff22008-04-10 08:47:53 -04002254 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002255 default:
Carsten Otte043405e2007-10-10 17:16:19 +02002256 return kvm_arch_dev_ioctl(filp, ioctl, arg);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002257 }
2258out:
2259 return r;
2260}
2261
Avi Kivity6aa8b732006-12-10 02:21:36 -08002262static struct file_operations kvm_chardev_ops = {
Avi Kivity6aa8b732006-12-10 02:21:36 -08002263 .unlocked_ioctl = kvm_dev_ioctl,
2264 .compat_ioctl = kvm_dev_ioctl,
Arnd Bergmann6038f372010-08-15 18:52:59 +02002265 .llseek = noop_llseek,
Avi Kivity6aa8b732006-12-10 02:21:36 -08002266};
2267
2268static struct miscdevice kvm_dev = {
Avi Kivitybbe44322007-03-04 13:27:36 +02002269 KVM_MINOR,
Avi Kivity6aa8b732006-12-10 02:21:36 -08002270 "kvm",
2271 &kvm_chardev_ops,
2272};
2273
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002274static void hardware_enable_nolock(void *junk)
Avi Kivity1b6c0162007-05-24 13:03:52 +03002275{
2276 int cpu = raw_smp_processor_id();
Alexander Graf10474ae2009-09-15 11:37:46 +02002277 int r;
Avi Kivity1b6c0162007-05-24 13:03:52 +03002278
Rusty Russell7f59f492008-12-07 21:25:45 +10302279 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
Avi Kivity1b6c0162007-05-24 13:03:52 +03002280 return;
Alexander Graf10474ae2009-09-15 11:37:46 +02002281
Rusty Russell7f59f492008-12-07 21:25:45 +10302282 cpumask_set_cpu(cpu, cpus_hardware_enabled);
Alexander Graf10474ae2009-09-15 11:37:46 +02002283
2284 r = kvm_arch_hardware_enable(NULL);
2285
2286 if (r) {
2287 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2288 atomic_inc(&hardware_enable_failed);
2289 printk(KERN_INFO "kvm: enabling virtualization on "
2290 "CPU%d failed\n", cpu);
2291 }
Avi Kivity1b6c0162007-05-24 13:03:52 +03002292}
2293
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002294static void hardware_enable(void *junk)
2295{
Jan Kiszkae935b832011-02-08 12:55:33 +01002296 raw_spin_lock(&kvm_lock);
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002297 hardware_enable_nolock(junk);
Jan Kiszkae935b832011-02-08 12:55:33 +01002298 raw_spin_unlock(&kvm_lock);
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002299}
2300
2301static void hardware_disable_nolock(void *junk)
Avi Kivity1b6c0162007-05-24 13:03:52 +03002302{
2303 int cpu = raw_smp_processor_id();
2304
Rusty Russell7f59f492008-12-07 21:25:45 +10302305 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
Avi Kivity1b6c0162007-05-24 13:03:52 +03002306 return;
Rusty Russell7f59f492008-12-07 21:25:45 +10302307 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002308 kvm_arch_hardware_disable(NULL);
Avi Kivity1b6c0162007-05-24 13:03:52 +03002309}
2310
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002311static void hardware_disable(void *junk)
2312{
Jan Kiszkae935b832011-02-08 12:55:33 +01002313 raw_spin_lock(&kvm_lock);
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002314 hardware_disable_nolock(junk);
Jan Kiszkae935b832011-02-08 12:55:33 +01002315 raw_spin_unlock(&kvm_lock);
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002316}
2317
Alexander Graf10474ae2009-09-15 11:37:46 +02002318static void hardware_disable_all_nolock(void)
2319{
2320 BUG_ON(!kvm_usage_count);
2321
2322 kvm_usage_count--;
2323 if (!kvm_usage_count)
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002324 on_each_cpu(hardware_disable_nolock, NULL, 1);
Alexander Graf10474ae2009-09-15 11:37:46 +02002325}
2326
2327static void hardware_disable_all(void)
2328{
Jan Kiszkae935b832011-02-08 12:55:33 +01002329 raw_spin_lock(&kvm_lock);
Alexander Graf10474ae2009-09-15 11:37:46 +02002330 hardware_disable_all_nolock();
Jan Kiszkae935b832011-02-08 12:55:33 +01002331 raw_spin_unlock(&kvm_lock);
Alexander Graf10474ae2009-09-15 11:37:46 +02002332}
2333
2334static int hardware_enable_all(void)
2335{
2336 int r = 0;
2337
Jan Kiszkae935b832011-02-08 12:55:33 +01002338 raw_spin_lock(&kvm_lock);
Alexander Graf10474ae2009-09-15 11:37:46 +02002339
2340 kvm_usage_count++;
2341 if (kvm_usage_count == 1) {
2342 atomic_set(&hardware_enable_failed, 0);
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002343 on_each_cpu(hardware_enable_nolock, NULL, 1);
Alexander Graf10474ae2009-09-15 11:37:46 +02002344
2345 if (atomic_read(&hardware_enable_failed)) {
2346 hardware_disable_all_nolock();
2347 r = -EBUSY;
2348 }
2349 }
2350
Jan Kiszkae935b832011-02-08 12:55:33 +01002351 raw_spin_unlock(&kvm_lock);
Alexander Graf10474ae2009-09-15 11:37:46 +02002352
2353 return r;
2354}
2355
Avi Kivity774c47f2007-02-12 00:54:47 -08002356static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2357 void *v)
2358{
2359 int cpu = (long)v;
2360
Alexander Graf10474ae2009-09-15 11:37:46 +02002361 if (!kvm_usage_count)
2362 return NOTIFY_OK;
2363
Avi Kivity1a6f4d72007-11-11 18:37:32 +02002364 val &= ~CPU_TASKS_FROZEN;
Avi Kivity774c47f2007-02-12 00:54:47 -08002365 switch (val) {
Avi Kivitycec9ad22007-05-24 13:11:41 +03002366 case CPU_DYING:
Avi Kivity6ec8a8562007-08-19 15:57:26 +03002367 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2368 cpu);
2369 hardware_disable(NULL);
2370 break;
Zachary Amsdenda908f22010-08-19 22:07:27 -10002371 case CPU_STARTING:
Jeremy Katz43934a32007-02-19 14:37:46 +02002372 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2373 cpu);
Zachary Amsdenda908f22010-08-19 22:07:27 -10002374 hardware_enable(NULL);
Avi Kivity774c47f2007-02-12 00:54:47 -08002375 break;
2376 }
2377 return NOTIFY_OK;
2378}
2379
Avi Kivity4ecac3f2008-05-13 13:23:38 +03002380
Avi Kivityb7c41452010-12-02 17:52:50 +02002381asmlinkage void kvm_spurious_fault(void)
Avi Kivity4ecac3f2008-05-13 13:23:38 +03002382{
Avi Kivity4ecac3f2008-05-13 13:23:38 +03002383 /* Fault while not rebooting. We want the trace. */
2384 BUG();
2385}
Avi Kivityb7c41452010-12-02 17:52:50 +02002386EXPORT_SYMBOL_GPL(kvm_spurious_fault);
Avi Kivity4ecac3f2008-05-13 13:23:38 +03002387
Rusty Russell9a2b85c2007-07-17 23:17:55 +10002388static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
Mike Dayd77c26f2007-10-08 09:02:08 -04002389 void *v)
Rusty Russell9a2b85c2007-07-17 23:17:55 +10002390{
Sheng Yang8e1c1812009-04-29 11:09:04 +08002391 /*
2392 * Some (well, at least mine) BIOSes hang on reboot if
2393 * in vmx root mode.
2394 *
2395 * And Intel TXT required VMX off for all cpu when system shutdown.
2396 */
2397 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2398 kvm_rebooting = true;
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002399 on_each_cpu(hardware_disable_nolock, NULL, 1);
Rusty Russell9a2b85c2007-07-17 23:17:55 +10002400 return NOTIFY_OK;
2401}
2402
2403static struct notifier_block kvm_reboot_notifier = {
2404 .notifier_call = kvm_reboot,
2405 .priority = 0,
2406};
2407
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002408static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002409{
2410 int i;
2411
2412 for (i = 0; i < bus->dev_count; i++) {
Sasha Levin743eeb02011-07-27 16:00:48 +03002413 struct kvm_io_device *pos = bus->range[i].dev;
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002414
2415 kvm_iodevice_destructor(pos);
2416 }
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002417 kfree(bus);
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002418}
2419
Sasha Levin743eeb02011-07-27 16:00:48 +03002420int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
2421{
2422 const struct kvm_io_range *r1 = p1;
2423 const struct kvm_io_range *r2 = p2;
2424
2425 if (r1->addr < r2->addr)
2426 return -1;
2427 if (r1->addr + r1->len > r2->addr + r2->len)
2428 return 1;
2429 return 0;
2430}
2431
2432int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
2433 gpa_t addr, int len)
2434{
2435 if (bus->dev_count == NR_IOBUS_DEVS)
2436 return -ENOSPC;
2437
2438 bus->range[bus->dev_count++] = (struct kvm_io_range) {
2439 .addr = addr,
2440 .len = len,
2441 .dev = dev,
2442 };
2443
2444 sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
2445 kvm_io_bus_sort_cmp, NULL);
2446
2447 return 0;
2448}
2449
2450int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
2451 gpa_t addr, int len)
2452{
2453 struct kvm_io_range *range, key;
2454 int off;
2455
2456 key = (struct kvm_io_range) {
2457 .addr = addr,
2458 .len = len,
2459 };
2460
2461 range = bsearch(&key, bus->range, bus->dev_count,
2462 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
2463 if (range == NULL)
2464 return -ENOENT;
2465
2466 off = range - bus->range;
2467
2468 while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0)
2469 off--;
2470
2471 return off;
2472}
2473
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002474/* kvm_io_bus_write - called under kvm->slots_lock */
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002475int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002476 int len, const void *val)
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002477{
Sasha Levin743eeb02011-07-27 16:00:48 +03002478 int idx;
Lai Jiangshan90d83dc2010-04-19 17:41:23 +08002479 struct kvm_io_bus *bus;
Sasha Levin743eeb02011-07-27 16:00:48 +03002480 struct kvm_io_range range;
2481
2482 range = (struct kvm_io_range) {
2483 .addr = addr,
2484 .len = len,
2485 };
Lai Jiangshan90d83dc2010-04-19 17:41:23 +08002486
2487 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
Sasha Levin743eeb02011-07-27 16:00:48 +03002488 idx = kvm_io_bus_get_first_dev(bus, addr, len);
2489 if (idx < 0)
2490 return -EOPNOTSUPP;
2491
2492 while (idx < bus->dev_count &&
2493 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2494 if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val))
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002495 return 0;
Sasha Levin743eeb02011-07-27 16:00:48 +03002496 idx++;
2497 }
2498
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002499 return -EOPNOTSUPP;
2500}
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002501
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002502/* kvm_io_bus_read - called under kvm->slots_lock */
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002503int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2504 int len, void *val)
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002505{
Sasha Levin743eeb02011-07-27 16:00:48 +03002506 int idx;
Lai Jiangshan90d83dc2010-04-19 17:41:23 +08002507 struct kvm_io_bus *bus;
Sasha Levin743eeb02011-07-27 16:00:48 +03002508 struct kvm_io_range range;
2509
2510 range = (struct kvm_io_range) {
2511 .addr = addr,
2512 .len = len,
2513 };
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002514
Lai Jiangshan90d83dc2010-04-19 17:41:23 +08002515 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
Sasha Levin743eeb02011-07-27 16:00:48 +03002516 idx = kvm_io_bus_get_first_dev(bus, addr, len);
2517 if (idx < 0)
2518 return -EOPNOTSUPP;
2519
2520 while (idx < bus->dev_count &&
2521 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2522 if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val))
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002523 return 0;
Sasha Levin743eeb02011-07-27 16:00:48 +03002524 idx++;
2525 }
2526
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002527 return -EOPNOTSUPP;
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002528}
2529
Marcelo Tosatti79fac952009-12-23 14:35:26 -02002530/* Caller must hold slots_lock. */
Sasha Levin743eeb02011-07-27 16:00:48 +03002531int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2532 int len, struct kvm_io_device *dev)
Michael S. Tsirkin6c474692009-06-29 22:24:26 +03002533{
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002534 struct kvm_io_bus *new_bus, *bus;
Gregory Haskins090b7af2009-07-07 17:08:44 -04002535
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002536 bus = kvm->buses[bus_idx];
Gregory Haskins090b7af2009-07-07 17:08:44 -04002537 if (bus->dev_count > NR_IOBUS_DEVS-1)
2538 return -ENOSPC;
2539
Thomas Meyer6da64fd2011-11-08 20:32:19 +01002540 new_bus = kmemdup(bus, sizeof(struct kvm_io_bus), GFP_KERNEL);
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002541 if (!new_bus)
2542 return -ENOMEM;
Sasha Levin743eeb02011-07-27 16:00:48 +03002543 kvm_io_bus_insert_dev(new_bus, dev, addr, len);
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002544 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2545 synchronize_srcu_expedited(&kvm->srcu);
2546 kfree(bus);
Gregory Haskins090b7af2009-07-07 17:08:44 -04002547
2548 return 0;
2549}
2550
Marcelo Tosatti79fac952009-12-23 14:35:26 -02002551/* Caller must hold slots_lock. */
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002552int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2553 struct kvm_io_device *dev)
Gregory Haskins090b7af2009-07-07 17:08:44 -04002554{
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002555 int i, r;
2556 struct kvm_io_bus *new_bus, *bus;
Michael S. Tsirkin6c474692009-06-29 22:24:26 +03002557
Sasha Levincdfca7b2011-12-04 19:36:28 +02002558 bus = kvm->buses[bus_idx];
2559
2560 new_bus = kmemdup(bus, sizeof(*bus), GFP_KERNEL);
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002561 if (!new_bus)
2562 return -ENOMEM;
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002563
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002564 r = -ENOENT;
2565 for (i = 0; i < new_bus->dev_count; i++)
Sasha Levin743eeb02011-07-27 16:00:48 +03002566 if (new_bus->range[i].dev == dev) {
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002567 r = 0;
Sasha Levin743eeb02011-07-27 16:00:48 +03002568 new_bus->dev_count--;
2569 new_bus->range[i] = new_bus->range[new_bus->dev_count];
2570 sort(new_bus->range, new_bus->dev_count,
2571 sizeof(struct kvm_io_range),
2572 kvm_io_bus_sort_cmp, NULL);
Gregory Haskins090b7af2009-07-07 17:08:44 -04002573 break;
2574 }
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002575
2576 if (r) {
2577 kfree(new_bus);
2578 return r;
2579 }
2580
2581 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2582 synchronize_srcu_expedited(&kvm->srcu);
2583 kfree(bus);
2584 return r;
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002585}
2586
Avi Kivity774c47f2007-02-12 00:54:47 -08002587static struct notifier_block kvm_cpu_notifier = {
2588 .notifier_call = kvm_cpu_hotplug,
Avi Kivity774c47f2007-02-12 00:54:47 -08002589};
2590
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002591static int vm_stat_get(void *_offset, u64 *val)
Avi Kivityba1389b2007-11-18 16:24:12 +02002592{
2593 unsigned offset = (long)_offset;
Avi Kivityba1389b2007-11-18 16:24:12 +02002594 struct kvm *kvm;
2595
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002596 *val = 0;
Jan Kiszkae935b832011-02-08 12:55:33 +01002597 raw_spin_lock(&kvm_lock);
Avi Kivityba1389b2007-11-18 16:24:12 +02002598 list_for_each_entry(kvm, &vm_list, vm_list)
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002599 *val += *(u32 *)((void *)kvm + offset);
Jan Kiszkae935b832011-02-08 12:55:33 +01002600 raw_spin_unlock(&kvm_lock);
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002601 return 0;
Avi Kivityba1389b2007-11-18 16:24:12 +02002602}
2603
2604DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2605
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002606static int vcpu_stat_get(void *_offset, u64 *val)
Avi Kivity1165f5f2007-04-19 17:27:43 +03002607{
2608 unsigned offset = (long)_offset;
Avi Kivity1165f5f2007-04-19 17:27:43 +03002609 struct kvm *kvm;
2610 struct kvm_vcpu *vcpu;
2611 int i;
2612
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002613 *val = 0;
Jan Kiszkae935b832011-02-08 12:55:33 +01002614 raw_spin_lock(&kvm_lock);
Avi Kivity1165f5f2007-04-19 17:27:43 +03002615 list_for_each_entry(kvm, &vm_list, vm_list)
Gleb Natapov988a2ca2009-06-09 15:56:29 +03002616 kvm_for_each_vcpu(i, vcpu, kvm)
2617 *val += *(u32 *)((void *)vcpu + offset);
2618
Jan Kiszkae935b832011-02-08 12:55:33 +01002619 raw_spin_unlock(&kvm_lock);
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002620 return 0;
Avi Kivity1165f5f2007-04-19 17:27:43 +03002621}
2622
Avi Kivityba1389b2007-11-18 16:24:12 +02002623DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2624
Alexey Dobriyan828c0952009-10-01 15:43:56 -07002625static const struct file_operations *stat_fops[] = {
Avi Kivityba1389b2007-11-18 16:24:12 +02002626 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2627 [KVM_STAT_VM] = &vm_stat_fops,
2628};
Avi Kivity1165f5f2007-04-19 17:27:43 +03002629
Hamo4f69b682011-12-15 14:23:16 +08002630static int kvm_init_debug(void)
Avi Kivity6aa8b732006-12-10 02:21:36 -08002631{
Hamo4f69b682011-12-15 14:23:16 +08002632 int r = -EFAULT;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002633 struct kvm_stats_debugfs_item *p;
2634
Hollis Blanchard76f7c872008-04-15 16:05:42 -05002635 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
Hamo4f69b682011-12-15 14:23:16 +08002636 if (kvm_debugfs_dir == NULL)
2637 goto out;
2638
2639 for (p = debugfs_entries; p->name; ++p) {
Hollis Blanchard76f7c872008-04-15 16:05:42 -05002640 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
Avi Kivity1165f5f2007-04-19 17:27:43 +03002641 (void *)(long)p->offset,
Avi Kivityba1389b2007-11-18 16:24:12 +02002642 stat_fops[p->kind]);
Hamo4f69b682011-12-15 14:23:16 +08002643 if (p->dentry == NULL)
2644 goto out_dir;
2645 }
2646
2647 return 0;
2648
2649out_dir:
2650 debugfs_remove_recursive(kvm_debugfs_dir);
2651out:
2652 return r;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002653}
2654
2655static void kvm_exit_debug(void)
2656{
2657 struct kvm_stats_debugfs_item *p;
2658
2659 for (p = debugfs_entries; p->name; ++p)
2660 debugfs_remove(p->dentry);
Hollis Blanchard76f7c872008-04-15 16:05:42 -05002661 debugfs_remove(kvm_debugfs_dir);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002662}
2663
Rafael J. Wysockifb3600c2011-03-23 22:16:23 +01002664static int kvm_suspend(void)
Avi Kivity59ae6c62007-02-12 00:54:48 -08002665{
Alexander Graf10474ae2009-09-15 11:37:46 +02002666 if (kvm_usage_count)
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002667 hardware_disable_nolock(NULL);
Avi Kivity59ae6c62007-02-12 00:54:48 -08002668 return 0;
2669}
2670
Rafael J. Wysockifb3600c2011-03-23 22:16:23 +01002671static void kvm_resume(void)
Avi Kivity59ae6c62007-02-12 00:54:48 -08002672{
Zachary Amsdenca84d1a2010-08-19 22:07:28 -10002673 if (kvm_usage_count) {
Jan Kiszkae935b832011-02-08 12:55:33 +01002674 WARN_ON(raw_spin_is_locked(&kvm_lock));
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002675 hardware_enable_nolock(NULL);
Zachary Amsdenca84d1a2010-08-19 22:07:28 -10002676 }
Avi Kivity59ae6c62007-02-12 00:54:48 -08002677}
2678
Rafael J. Wysockifb3600c2011-03-23 22:16:23 +01002679static struct syscore_ops kvm_syscore_ops = {
Avi Kivity59ae6c62007-02-12 00:54:48 -08002680 .suspend = kvm_suspend,
2681 .resume = kvm_resume,
2682};
2683
Izik Eiduscea7bb22007-10-17 19:17:48 +02002684struct page *bad_page;
Anthony Liguori35149e22008-04-02 14:46:56 -05002685pfn_t bad_pfn;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002686
Avi Kivity15ad7142007-07-11 18:17:21 +03002687static inline
2688struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2689{
2690 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2691}
2692
2693static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2694{
2695 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2696
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002697 kvm_arch_vcpu_load(vcpu, cpu);
Avi Kivity15ad7142007-07-11 18:17:21 +03002698}
2699
2700static void kvm_sched_out(struct preempt_notifier *pn,
2701 struct task_struct *next)
2702{
2703 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2704
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002705 kvm_arch_vcpu_put(vcpu);
Avi Kivity15ad7142007-07-11 18:17:21 +03002706}
2707
Avi Kivity0ee75be2010-04-28 15:39:01 +03002708int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
Rusty Russellc16f8622007-07-30 21:12:19 +10002709 struct module *module)
Avi Kivity6aa8b732006-12-10 02:21:36 -08002710{
2711 int r;
Yang, Sheng002c7f72007-07-31 14:23:01 +03002712 int cpu;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002713
Zhang Xiantaof8c16bb2007-11-14 20:40:21 +08002714 r = kvm_arch_init(opaque);
2715 if (r)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002716 goto out_fail;
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002717
2718 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2719
2720 if (bad_page == NULL) {
2721 r = -ENOMEM;
2722 goto out;
2723 }
2724
Anthony Liguori35149e22008-04-02 14:46:56 -05002725 bad_pfn = page_to_pfn(bad_page);
2726
Huang Yingbf998152010-05-31 14:28:19 +08002727 hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2728
2729 if (hwpoison_page == NULL) {
2730 r = -ENOMEM;
2731 goto out_free_0;
2732 }
2733
2734 hwpoison_pfn = page_to_pfn(hwpoison_page);
2735
Gleb Natapovedba23e2010-07-07 20:16:45 +03002736 fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2737
2738 if (fault_page == NULL) {
2739 r = -ENOMEM;
2740 goto out_free_0;
2741 }
2742
2743 fault_pfn = page_to_pfn(fault_page);
2744
Avi Kivity8437a612009-06-06 14:52:35 -07002745 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
Rusty Russell7f59f492008-12-07 21:25:45 +10302746 r = -ENOMEM;
2747 goto out_free_0;
2748 }
2749
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002750 r = kvm_arch_hardware_setup();
Avi Kivity6aa8b732006-12-10 02:21:36 -08002751 if (r < 0)
Rusty Russell7f59f492008-12-07 21:25:45 +10302752 goto out_free_0a;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002753
Yang, Sheng002c7f72007-07-31 14:23:01 +03002754 for_each_online_cpu(cpu) {
2755 smp_call_function_single(cpu,
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002756 kvm_arch_check_processor_compat,
Jens Axboe8691e5a2008-06-06 11:18:06 +02002757 &r, 1);
Yang, Sheng002c7f72007-07-31 14:23:01 +03002758 if (r < 0)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002759 goto out_free_1;
Yang, Sheng002c7f72007-07-31 14:23:01 +03002760 }
2761
Avi Kivity774c47f2007-02-12 00:54:47 -08002762 r = register_cpu_notifier(&kvm_cpu_notifier);
2763 if (r)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002764 goto out_free_2;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002765 register_reboot_notifier(&kvm_reboot_notifier);
2766
Rusty Russellc16f8622007-07-30 21:12:19 +10002767 /* A kmem cache lets us meet the alignment requirements of fx_save. */
Avi Kivity0ee75be2010-04-28 15:39:01 +03002768 if (!vcpu_align)
2769 vcpu_align = __alignof__(struct kvm_vcpu);
2770 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
Joe Perches56919c52007-11-12 20:06:51 -08002771 0, NULL);
Rusty Russellc16f8622007-07-30 21:12:19 +10002772 if (!kvm_vcpu_cache) {
2773 r = -ENOMEM;
Rafael J. Wysockifb3600c2011-03-23 22:16:23 +01002774 goto out_free_3;
Rusty Russellc16f8622007-07-30 21:12:19 +10002775 }
2776
Gleb Natapovaf585b92010-10-14 11:22:46 +02002777 r = kvm_async_pf_init();
2778 if (r)
2779 goto out_free;
2780
Avi Kivity6aa8b732006-12-10 02:21:36 -08002781 kvm_chardev_ops.owner = module;
Christian Borntraeger3d3aab12008-12-02 11:17:32 +01002782 kvm_vm_fops.owner = module;
2783 kvm_vcpu_fops.owner = module;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002784
2785 r = misc_register(&kvm_dev);
2786 if (r) {
Mike Dayd77c26f2007-10-08 09:02:08 -04002787 printk(KERN_ERR "kvm: misc device register failed\n");
Gleb Natapovaf585b92010-10-14 11:22:46 +02002788 goto out_unreg;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002789 }
2790
Rafael J. Wysockifb3600c2011-03-23 22:16:23 +01002791 register_syscore_ops(&kvm_syscore_ops);
2792
Avi Kivity15ad7142007-07-11 18:17:21 +03002793 kvm_preempt_ops.sched_in = kvm_sched_in;
2794 kvm_preempt_ops.sched_out = kvm_sched_out;
2795
Hamo4f69b682011-12-15 14:23:16 +08002796 r = kvm_init_debug();
2797 if (r) {
2798 printk(KERN_ERR "kvm: create debugfs files failed\n");
2799 goto out_undebugfs;
2800 }
Darrick J. Wong0ea4ed82009-10-14 16:21:00 -07002801
Avi Kivityc7addb92007-09-16 18:58:32 +02002802 return 0;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002803
Hamo4f69b682011-12-15 14:23:16 +08002804out_undebugfs:
2805 unregister_syscore_ops(&kvm_syscore_ops);
Gleb Natapovaf585b92010-10-14 11:22:46 +02002806out_unreg:
2807 kvm_async_pf_deinit();
Avi Kivity6aa8b732006-12-10 02:21:36 -08002808out_free:
Rusty Russellc16f8622007-07-30 21:12:19 +10002809 kmem_cache_destroy(kvm_vcpu_cache);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002810out_free_3:
Avi Kivity6aa8b732006-12-10 02:21:36 -08002811 unregister_reboot_notifier(&kvm_reboot_notifier);
Avi Kivity774c47f2007-02-12 00:54:47 -08002812 unregister_cpu_notifier(&kvm_cpu_notifier);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002813out_free_2:
Zhang Xiantaod23087842007-11-29 15:35:39 +08002814out_free_1:
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002815 kvm_arch_hardware_unsetup();
Rusty Russell7f59f492008-12-07 21:25:45 +10302816out_free_0a:
2817 free_cpumask_var(cpus_hardware_enabled);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002818out_free_0:
Gleb Natapovedba23e2010-07-07 20:16:45 +03002819 if (fault_page)
2820 __free_page(fault_page);
Huang Yingbf998152010-05-31 14:28:19 +08002821 if (hwpoison_page)
2822 __free_page(hwpoison_page);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002823 __free_page(bad_page);
Avi Kivityca45aaa2007-03-01 19:21:03 +02002824out:
Zhang Xiantaof8c16bb2007-11-14 20:40:21 +08002825 kvm_arch_exit();
Zhang Xiantaod23087842007-11-29 15:35:39 +08002826out_fail:
Avi Kivity6aa8b732006-12-10 02:21:36 -08002827 return r;
2828}
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002829EXPORT_SYMBOL_GPL(kvm_init);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002830
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002831void kvm_exit(void)
Avi Kivity6aa8b732006-12-10 02:21:36 -08002832{
Darrick J. Wong0ea4ed82009-10-14 16:21:00 -07002833 kvm_exit_debug();
Avi Kivity6aa8b732006-12-10 02:21:36 -08002834 misc_deregister(&kvm_dev);
Rusty Russellc16f8622007-07-30 21:12:19 +10002835 kmem_cache_destroy(kvm_vcpu_cache);
Gleb Natapovaf585b92010-10-14 11:22:46 +02002836 kvm_async_pf_deinit();
Rafael J. Wysockifb3600c2011-03-23 22:16:23 +01002837 unregister_syscore_ops(&kvm_syscore_ops);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002838 unregister_reboot_notifier(&kvm_reboot_notifier);
Avi Kivity59ae6c62007-02-12 00:54:48 -08002839 unregister_cpu_notifier(&kvm_cpu_notifier);
Takuya Yoshikawa75b71272010-11-16 17:37:41 +09002840 on_each_cpu(hardware_disable_nolock, NULL, 1);
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002841 kvm_arch_hardware_unsetup();
Zhang Xiantaof8c16bb2007-11-14 20:40:21 +08002842 kvm_arch_exit();
Rusty Russell7f59f492008-12-07 21:25:45 +10302843 free_cpumask_var(cpus_hardware_enabled);
Huang Yingbf998152010-05-31 14:28:19 +08002844 __free_page(hwpoison_page);
Izik Eiduscea7bb22007-10-17 19:17:48 +02002845 __free_page(bad_page);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002846}
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002847EXPORT_SYMBOL_GPL(kvm_exit);