blob: 74f731920945c72375450865c448cdbabb1a829e [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.
Avi Kivity221d0592010-05-23 18:37:00 +03008 * Copyright 2010 Red Hat, Inc. and/or its affilates.
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>
Avi Kivity59ae6c62007-02-12 00:54:48 -080033#include <linux/sysdev.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>
Avi Kivity6aa8b732006-12-10 02:21:36 -080050
Avi Kivitye4956062007-06-28 14:15:57 -040051#include <asm/processor.h>
Avi Kivitye4956062007-06-28 14:15:57 -040052#include <asm/io.h>
53#include <asm/uaccess.h>
Izik Eidus3e021bf2007-11-19 11:16:57 +020054#include <asm/pgtable.h>
Alexander Grafc8240bd2009-10-30 05:47:26 +000055#include <asm-generic/bitops/le.h>
Avi Kivity6aa8b732006-12-10 02:21:36 -080056
Laurent Vivier5f94c172008-05-30 16:05:54 +020057#include "coalesced_mmio.h"
Laurent Vivier5f94c172008-05-30 16:05:54 +020058
Marcelo Tosatti229456f2009-06-17 09:22:14 -030059#define CREATE_TRACE_POINTS
60#include <trace/events/kvm.h>
61
Avi Kivity6aa8b732006-12-10 02:21:36 -080062MODULE_AUTHOR("Qumranet");
63MODULE_LICENSE("GPL");
64
Marcelo Tosattifa40a822009-06-04 15:08:24 -030065/*
66 * Ordering of locks:
67 *
Sheng Yangfae3a352009-12-15 10:28:07 +080068 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
Marcelo Tosattifa40a822009-06-04 15:08:24 -030069 */
70
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +080071DEFINE_SPINLOCK(kvm_lock);
72LIST_HEAD(vm_list);
Avi Kivity133de902007-02-12 00:54:44 -080073
Rusty Russell7f59f492008-12-07 21:25:45 +103074static cpumask_var_t cpus_hardware_enabled;
Alexander Graf10474ae2009-09-15 11:37:46 +020075static int kvm_usage_count = 0;
76static atomic_t hardware_enable_failed;
Avi Kivity1b6c0162007-05-24 13:03:52 +030077
Rusty Russellc16f8622007-07-30 21:12:19 +100078struct kmem_cache *kvm_vcpu_cache;
79EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
Avi Kivity1165f5f2007-04-19 17:27:43 +030080
Avi Kivity15ad7142007-07-11 18:17:21 +030081static __read_mostly struct preempt_ops kvm_preempt_ops;
82
Hollis Blanchard76f7c872008-04-15 16:05:42 -050083struct dentry *kvm_debugfs_dir;
Avi Kivity6aa8b732006-12-10 02:21:36 -080084
Avi Kivitybccf2152007-02-21 18:04:26 +020085static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
86 unsigned long arg);
Alexander Graf10474ae2009-09-15 11:37:46 +020087static int hardware_enable_all(void);
88static void hardware_disable_all(void);
Avi Kivitybccf2152007-02-21 18:04:26 +020089
Marcelo Tosattie93f8a02009-12-23 14:35:24 -020090static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
91
Hannes Edere8ba5d32008-11-28 17:02:42 +010092static bool kvm_rebooting;
Avi Kivity4ecac3f2008-05-13 13:23:38 +030093
Marcelo Tosatti54dee992009-06-11 12:07:44 -030094static bool largepages_enabled = true;
95
Huang Yingbf998152010-05-31 14:28:19 +080096struct page *hwpoison_page;
97pfn_t hwpoison_pfn;
98
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +080099inline int kvm_is_mmio_pfn(pfn_t pfn)
Ben-Ami Yassourcbff90a2008-07-28 19:26:24 +0300100{
Joerg Roedelfc5659c2009-02-18 14:08:58 +0100101 if (pfn_valid(pfn)) {
102 struct page *page = compound_head(pfn_to_page(pfn));
103 return PageReserved(page);
104 }
Ben-Ami Yassourcbff90a2008-07-28 19:26:24 +0300105
106 return true;
107}
108
Avi Kivity6aa8b732006-12-10 02:21:36 -0800109/*
110 * Switches to specified vcpu, until a matching vcpu_put()
111 */
Carsten Otte313a3dc2007-10-11 19:16:52 +0200112void vcpu_load(struct kvm_vcpu *vcpu)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800113{
Avi Kivity15ad7142007-07-11 18:17:21 +0300114 int cpu;
115
Avi Kivitybccf2152007-02-21 18:04:26 +0200116 mutex_lock(&vcpu->mutex);
Avi Kivity15ad7142007-07-11 18:17:21 +0300117 cpu = get_cpu();
118 preempt_notifier_register(&vcpu->preempt_notifier);
Carsten Otte313a3dc2007-10-11 19:16:52 +0200119 kvm_arch_vcpu_load(vcpu, cpu);
Avi Kivity15ad7142007-07-11 18:17:21 +0300120 put_cpu();
Avi Kivitybccf2152007-02-21 18:04:26 +0200121}
122
Carsten Otte313a3dc2007-10-11 19:16:52 +0200123void vcpu_put(struct kvm_vcpu *vcpu)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800124{
Avi Kivity15ad7142007-07-11 18:17:21 +0300125 preempt_disable();
Carsten Otte313a3dc2007-10-11 19:16:52 +0200126 kvm_arch_vcpu_put(vcpu);
Avi Kivity15ad7142007-07-11 18:17:21 +0300127 preempt_notifier_unregister(&vcpu->preempt_notifier);
128 preempt_enable();
Avi Kivity6aa8b732006-12-10 02:21:36 -0800129 mutex_unlock(&vcpu->mutex);
130}
131
Avi Kivityd9e368d2007-06-07 19:18:30 +0300132static void ack_flush(void *_completed)
133{
Avi Kivityd9e368d2007-06-07 19:18:30 +0300134}
135
Rusty Russell49846892008-12-08 20:26:24 +1030136static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
Avi Kivityd9e368d2007-06-07 19:18:30 +0300137{
Avi Kivity597a5f52008-07-20 14:24:22 +0300138 int i, cpu, me;
Rusty Russell6ef7a1b2008-12-08 20:28:04 +1030139 cpumask_var_t cpus;
140 bool called = true;
Avi Kivityd9e368d2007-06-07 19:18:30 +0300141 struct kvm_vcpu *vcpu;
Avi Kivityd9e368d2007-06-07 19:18:30 +0300142
Li Zefan79f55992009-06-15 14:58:26 +0800143 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
Rusty Russell6ef7a1b2008-12-08 20:28:04 +1030144
Avi Kivity70e335e2010-02-18 11:25:22 +0200145 raw_spin_lock(&kvm->requests_lock);
Jan Kiszkae601e3b2009-07-20 11:30:12 +0200146 me = smp_processor_id();
Gleb Natapov988a2ca2009-06-09 15:56:29 +0300147 kvm_for_each_vcpu(i, vcpu, kvm) {
Avi Kivitya8eeb042010-05-10 12:34:53 +0300148 if (kvm_make_check_request(req, vcpu))
Avi Kivityd9e368d2007-06-07 19:18:30 +0300149 continue;
150 cpu = vcpu->cpu;
Rusty Russell6ef7a1b2008-12-08 20:28:04 +1030151 if (cpus != NULL && cpu != -1 && cpu != me)
152 cpumask_set_cpu(cpu, cpus);
Avi Kivityd9e368d2007-06-07 19:18:30 +0300153 }
Rusty Russell6ef7a1b2008-12-08 20:28:04 +1030154 if (unlikely(cpus == NULL))
155 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
156 else if (!cpumask_empty(cpus))
157 smp_call_function_many(cpus, ack_flush, NULL, 1);
158 else
159 called = false;
Avi Kivity70e335e2010-02-18 11:25:22 +0200160 raw_spin_unlock(&kvm->requests_lock);
Rusty Russell6ef7a1b2008-12-08 20:28:04 +1030161 free_cpumask_var(cpus);
Rusty Russell49846892008-12-08 20:26:24 +1030162 return called;
163}
164
165void kvm_flush_remote_tlbs(struct kvm *kvm)
166{
167 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
168 ++kvm->stat.remote_tlb_flush;
Avi Kivityd9e368d2007-06-07 19:18:30 +0300169}
170
Marcelo Tosatti2e53d632008-02-20 14:47:24 -0500171void kvm_reload_remote_mmus(struct kvm *kvm)
172{
Rusty Russell49846892008-12-08 20:26:24 +1030173 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
Marcelo Tosatti2e53d632008-02-20 14:47:24 -0500174}
175
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000176int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
177{
178 struct page *page;
179 int r;
180
181 mutex_init(&vcpu->mutex);
182 vcpu->cpu = -1;
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000183 vcpu->kvm = kvm;
184 vcpu->vcpu_id = id;
Eddie Dongb6958ce2007-07-18 12:15:21 +0300185 init_waitqueue_head(&vcpu->wq);
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000186
187 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
188 if (!page) {
189 r = -ENOMEM;
190 goto fail;
191 }
192 vcpu->run = page_address(page);
193
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +0800194 r = kvm_arch_vcpu_init(vcpu);
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000195 if (r < 0)
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +0800196 goto fail_free_run;
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000197 return 0;
198
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000199fail_free_run:
200 free_page((unsigned long)vcpu->run);
201fail:
Rusty Russell76fafa52007-10-08 10:50:48 +1000202 return r;
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000203}
204EXPORT_SYMBOL_GPL(kvm_vcpu_init);
205
206void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
207{
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +0800208 kvm_arch_vcpu_uninit(vcpu);
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000209 free_page((unsigned long)vcpu->run);
210}
211EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
212
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200213#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
214static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
215{
216 return container_of(mn, struct kvm, mmu_notifier);
217}
218
219static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
220 struct mm_struct *mm,
221 unsigned long address)
222{
223 struct kvm *kvm = mmu_notifier_to_kvm(mn);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200224 int need_tlb_flush, idx;
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200225
226 /*
227 * When ->invalidate_page runs, the linux pte has been zapped
228 * already but the page is still allocated until
229 * ->invalidate_page returns. So if we increase the sequence
230 * here the kvm page fault will notice if the spte can't be
231 * established because the page is going to be freed. If
232 * instead the kvm page fault establishes the spte before
233 * ->invalidate_page runs, kvm_unmap_hva will release it
234 * before returning.
235 *
236 * The sequence increase only need to be seen at spin_unlock
237 * time, and not at spin_lock time.
238 *
239 * Increasing the sequence after the spin_unlock would be
240 * unsafe because the kvm page fault could then establish the
241 * pte after kvm_unmap_hva returned, without noticing the page
242 * is going to be freed.
243 */
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200244 idx = srcu_read_lock(&kvm->srcu);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200245 spin_lock(&kvm->mmu_lock);
246 kvm->mmu_notifier_seq++;
247 need_tlb_flush = kvm_unmap_hva(kvm, address);
248 spin_unlock(&kvm->mmu_lock);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200249 srcu_read_unlock(&kvm->srcu, idx);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200250
251 /* we've to flush the tlb before the pages can be freed */
252 if (need_tlb_flush)
253 kvm_flush_remote_tlbs(kvm);
254
255}
256
Izik Eidus3da0dd42009-09-23 21:47:18 +0300257static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
258 struct mm_struct *mm,
259 unsigned long address,
260 pte_t pte)
261{
262 struct kvm *kvm = mmu_notifier_to_kvm(mn);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200263 int idx;
Izik Eidus3da0dd42009-09-23 21:47:18 +0300264
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200265 idx = srcu_read_lock(&kvm->srcu);
Izik Eidus3da0dd42009-09-23 21:47:18 +0300266 spin_lock(&kvm->mmu_lock);
267 kvm->mmu_notifier_seq++;
268 kvm_set_spte_hva(kvm, address, pte);
269 spin_unlock(&kvm->mmu_lock);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200270 srcu_read_unlock(&kvm->srcu, idx);
Izik Eidus3da0dd42009-09-23 21:47:18 +0300271}
272
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200273static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
274 struct mm_struct *mm,
275 unsigned long start,
276 unsigned long end)
277{
278 struct kvm *kvm = mmu_notifier_to_kvm(mn);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200279 int need_tlb_flush = 0, idx;
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200280
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200281 idx = srcu_read_lock(&kvm->srcu);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200282 spin_lock(&kvm->mmu_lock);
283 /*
284 * The count increase must become visible at unlock time as no
285 * spte can be established without taking the mmu_lock and
286 * count is also read inside the mmu_lock critical section.
287 */
288 kvm->mmu_notifier_count++;
289 for (; start < end; start += PAGE_SIZE)
290 need_tlb_flush |= kvm_unmap_hva(kvm, start);
291 spin_unlock(&kvm->mmu_lock);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200292 srcu_read_unlock(&kvm->srcu, idx);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200293
294 /* we've to flush the tlb before the pages can be freed */
295 if (need_tlb_flush)
296 kvm_flush_remote_tlbs(kvm);
297}
298
299static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
300 struct mm_struct *mm,
301 unsigned long start,
302 unsigned long end)
303{
304 struct kvm *kvm = mmu_notifier_to_kvm(mn);
305
306 spin_lock(&kvm->mmu_lock);
307 /*
308 * This sequence increase will notify the kvm page fault that
309 * the page that is going to be mapped in the spte could have
310 * been freed.
311 */
312 kvm->mmu_notifier_seq++;
313 /*
314 * The above sequence increase must be visible before the
315 * below count decrease but both values are read by the kvm
316 * page fault under mmu_lock spinlock so we don't need to add
317 * a smb_wmb() here in between the two.
318 */
319 kvm->mmu_notifier_count--;
320 spin_unlock(&kvm->mmu_lock);
321
322 BUG_ON(kvm->mmu_notifier_count < 0);
323}
324
325static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
326 struct mm_struct *mm,
327 unsigned long address)
328{
329 struct kvm *kvm = mmu_notifier_to_kvm(mn);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200330 int young, idx;
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200331
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200332 idx = srcu_read_lock(&kvm->srcu);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200333 spin_lock(&kvm->mmu_lock);
334 young = kvm_age_hva(kvm, address);
335 spin_unlock(&kvm->mmu_lock);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200336 srcu_read_unlock(&kvm->srcu, idx);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200337
338 if (young)
339 kvm_flush_remote_tlbs(kvm);
340
341 return young;
342}
343
Marcelo Tosatti85db06e2008-12-10 21:23:26 +0100344static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
345 struct mm_struct *mm)
346{
347 struct kvm *kvm = mmu_notifier_to_kvm(mn);
Lai Jiangshaneda2bed2010-04-20 14:29:29 +0800348 int idx;
349
350 idx = srcu_read_lock(&kvm->srcu);
Marcelo Tosatti85db06e2008-12-10 21:23:26 +0100351 kvm_arch_flush_shadow(kvm);
Lai Jiangshaneda2bed2010-04-20 14:29:29 +0800352 srcu_read_unlock(&kvm->srcu, idx);
Marcelo Tosatti85db06e2008-12-10 21:23:26 +0100353}
354
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200355static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
356 .invalidate_page = kvm_mmu_notifier_invalidate_page,
357 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
358 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
359 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
Izik Eidus3da0dd42009-09-23 21:47:18 +0300360 .change_pte = kvm_mmu_notifier_change_pte,
Marcelo Tosatti85db06e2008-12-10 21:23:26 +0100361 .release = kvm_mmu_notifier_release,
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200362};
Avi Kivity4c07b0a2009-12-20 14:54:04 +0200363
364static int kvm_init_mmu_notifier(struct kvm *kvm)
365{
366 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
367 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
368}
369
370#else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
371
372static int kvm_init_mmu_notifier(struct kvm *kvm)
373{
374 return 0;
375}
376
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200377#endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
378
Avi Kivityf17abe92007-02-21 19:28:04 +0200379static struct kvm *kvm_create_vm(void)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800380{
Marcelo Tosattie93f8a02009-12-23 14:35:24 -0200381 int r = 0, i;
Zhang Xiantaod19a9cd2007-11-18 18:43:45 +0800382 struct kvm *kvm = kvm_arch_create_vm();
Avi Kivity6aa8b732006-12-10 02:21:36 -0800383
Zhang Xiantaod19a9cd2007-11-18 18:43:45 +0800384 if (IS_ERR(kvm))
385 goto out;
Alexander Graf10474ae2009-09-15 11:37:46 +0200386
387 r = hardware_enable_all();
388 if (r)
389 goto out_err_nodisable;
390
Avi Kivity75858a82009-01-04 17:10:50 +0200391#ifdef CONFIG_HAVE_KVM_IRQCHIP
392 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
Gleb Natapov136bdfe2009-08-24 11:54:23 +0300393 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
Avi Kivity75858a82009-01-04 17:10:50 +0200394#endif
Avi Kivity6aa8b732006-12-10 02:21:36 -0800395
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200396 r = -ENOMEM;
397 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
398 if (!kvm->memslots)
399 goto out_err;
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200400 if (init_srcu_struct(&kvm->srcu))
401 goto out_err;
Marcelo Tosattie93f8a02009-12-23 14:35:24 -0200402 for (i = 0; i < KVM_NR_BUSES; i++) {
403 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
404 GFP_KERNEL);
405 if (!kvm->buses[i]) {
406 cleanup_srcu_struct(&kvm->srcu);
407 goto out_err;
408 }
409 }
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200410
Avi Kivity4c07b0a2009-12-20 14:54:04 +0200411 r = kvm_init_mmu_notifier(kvm);
Avi Kivity283d0c62009-12-20 14:25:19 +0200412 if (r) {
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200413 cleanup_srcu_struct(&kvm->srcu);
Avi Kivity283d0c62009-12-20 14:25:19 +0200414 goto out_err;
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200415 }
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200416
Avi Kivity6d4e4c42007-11-21 16:41:05 +0200417 kvm->mm = current->mm;
418 atomic_inc(&kvm->mm->mm_count);
Marcelo Tosattiaaee2c92007-12-20 19:18:26 -0500419 spin_lock_init(&kvm->mmu_lock);
Avi Kivity70e335e2010-02-18 11:25:22 +0200420 raw_spin_lock_init(&kvm->requests_lock);
Gregory Haskinsd34e6b12009-07-07 17:08:49 -0400421 kvm_eventfd_init(kvm);
Shaohua Li11ec2802007-07-23 14:51:37 +0800422 mutex_init(&kvm->lock);
Marcelo Tosatti60eead72009-06-04 15:08:23 -0300423 mutex_init(&kvm->irq_lock);
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200424 mutex_init(&kvm->slots_lock);
Izik Eidusd39f13b2008-03-30 16:01:25 +0300425 atomic_set(&kvm->users_count, 1);
Rusty Russell5e58cfe2007-07-23 17:08:21 +1000426 spin_lock(&kvm_lock);
427 list_add(&kvm->vm_list, &vm_list);
428 spin_unlock(&kvm_lock);
Zhang Xiantaod19a9cd2007-11-18 18:43:45 +0800429out:
Avi Kivityf17abe92007-02-21 19:28:04 +0200430 return kvm;
Alexander Graf10474ae2009-09-15 11:37:46 +0200431
432out_err:
433 hardware_disable_all();
434out_err_nodisable:
Marcelo Tosattie93f8a02009-12-23 14:35:24 -0200435 for (i = 0; i < KVM_NR_BUSES; i++)
436 kfree(kvm->buses[i]);
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200437 kfree(kvm->memslots);
Alexander Graf10474ae2009-09-15 11:37:46 +0200438 kfree(kvm);
439 return ERR_PTR(r);
Avi Kivityf17abe92007-02-21 19:28:04 +0200440}
441
Avi Kivity6aa8b732006-12-10 02:21:36 -0800442/*
443 * Free any memory in @free but not in @dont.
444 */
445static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
446 struct kvm_memory_slot *dont)
447{
Joerg Roedelec04b262009-06-19 15:16:23 +0200448 int i;
449
Izik Eidus290fc382007-09-27 14:11:22 +0200450 if (!dont || free->rmap != dont->rmap)
451 vfree(free->rmap);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800452
453 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
454 vfree(free->dirty_bitmap);
455
Joerg Roedelec04b262009-06-19 15:16:23 +0200456
457 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
458 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
459 vfree(free->lpage_info[i]);
460 free->lpage_info[i] = NULL;
461 }
462 }
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300463
Avi Kivity6aa8b732006-12-10 02:21:36 -0800464 free->npages = 0;
Al Viro8b6d44c2007-02-09 16:38:40 +0000465 free->dirty_bitmap = NULL;
Anthony Liguori8d4e1282007-10-18 09:59:34 -0500466 free->rmap = NULL;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800467}
468
Zhang Xiantaod19a9cd2007-11-18 18:43:45 +0800469void kvm_free_physmem(struct kvm *kvm)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800470{
471 int i;
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200472 struct kvm_memslots *slots = kvm->memslots;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800473
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200474 for (i = 0; i < slots->nmemslots; ++i)
475 kvm_free_physmem_slot(&slots->memslots[i], NULL);
476
477 kfree(kvm->memslots);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800478}
479
Avi Kivityf17abe92007-02-21 19:28:04 +0200480static void kvm_destroy_vm(struct kvm *kvm)
481{
Marcelo Tosattie93f8a02009-12-23 14:35:24 -0200482 int i;
Avi Kivity6d4e4c42007-11-21 16:41:05 +0200483 struct mm_struct *mm = kvm->mm;
484
Sheng Yangad8ba2c2009-01-06 10:03:02 +0800485 kvm_arch_sync_events(kvm);
Avi Kivity133de902007-02-12 00:54:44 -0800486 spin_lock(&kvm_lock);
487 list_del(&kvm->vm_list);
488 spin_unlock(&kvm_lock);
Avi Kivity399ec802008-11-19 13:58:46 +0200489 kvm_free_irq_routing(kvm);
Marcelo Tosattie93f8a02009-12-23 14:35:24 -0200490 for (i = 0; i < KVM_NR_BUSES; i++)
491 kvm_io_bus_destroy(kvm->buses[i]);
Avi Kivity980da6c2009-12-20 15:13:43 +0200492 kvm_coalesced_mmio_free(kvm);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200493#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
494 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
Gleb Natapovf00be0c2009-03-19 12:20:36 +0200495#else
496 kvm_arch_flush_shadow(kvm);
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200497#endif
Zhang Xiantaod19a9cd2007-11-18 18:43:45 +0800498 kvm_arch_destroy_vm(kvm);
Alexander Graf10474ae2009-09-15 11:37:46 +0200499 hardware_disable_all();
Avi Kivity6d4e4c42007-11-21 16:41:05 +0200500 mmdrop(mm);
Avi Kivityf17abe92007-02-21 19:28:04 +0200501}
502
Izik Eidusd39f13b2008-03-30 16:01:25 +0300503void kvm_get_kvm(struct kvm *kvm)
504{
505 atomic_inc(&kvm->users_count);
506}
507EXPORT_SYMBOL_GPL(kvm_get_kvm);
508
509void kvm_put_kvm(struct kvm *kvm)
510{
511 if (atomic_dec_and_test(&kvm->users_count))
512 kvm_destroy_vm(kvm);
513}
514EXPORT_SYMBOL_GPL(kvm_put_kvm);
515
516
Avi Kivityf17abe92007-02-21 19:28:04 +0200517static int kvm_vm_release(struct inode *inode, struct file *filp)
518{
519 struct kvm *kvm = filp->private_data;
520
Gregory Haskins721eecb2009-05-20 10:30:49 -0400521 kvm_irqfd_release(kvm);
522
Izik Eidusd39f13b2008-03-30 16:01:25 +0300523 kvm_put_kvm(kvm);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800524 return 0;
525}
526
Avi Kivity6aa8b732006-12-10 02:21:36 -0800527/*
Avi Kivity6aa8b732006-12-10 02:21:36 -0800528 * Allocate some memory and give it an address in the guest physical address
529 * space.
530 *
531 * Discontiguous memory is allowed, mostly for framebuffers.
Sheng Yangf78e0e22007-10-29 09:40:42 +0800532 *
Marcelo Tosatti10589a42007-12-20 19:18:22 -0500533 * Must be called holding mmap_sem for write.
Avi Kivity6aa8b732006-12-10 02:21:36 -0800534 */
Sheng Yangf78e0e22007-10-29 09:40:42 +0800535int __kvm_set_memory_region(struct kvm *kvm,
536 struct kvm_userspace_memory_region *mem,
537 int user_alloc)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800538{
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200539 int r, flush_shadow = 0;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800540 gfn_t base_gfn;
Heiko Carstens28bcb112009-09-03 17:35:35 +0200541 unsigned long npages;
542 unsigned long i;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800543 struct kvm_memory_slot *memslot;
544 struct kvm_memory_slot old, new;
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200545 struct kvm_memslots *slots, *old_memslots;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800546
547 r = -EINVAL;
548 /* General sanity checks */
549 if (mem->memory_size & (PAGE_SIZE - 1))
550 goto out;
551 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
552 goto out;
Sheng Yange7cacd42008-11-11 15:30:40 +0800553 if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
Hollis Blanchard78749802008-11-07 13:32:12 -0600554 goto out;
Izik Eiduse0d62c72007-10-24 23:57:46 +0200555 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800556 goto out;
557 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
558 goto out;
559
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200560 memslot = &kvm->memslots->memslots[mem->slot];
Avi Kivity6aa8b732006-12-10 02:21:36 -0800561 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
562 npages = mem->memory_size >> PAGE_SHIFT;
563
Takuya Yoshikawa660c22c2010-04-13 22:47:24 +0900564 r = -EINVAL;
565 if (npages > KVM_MEM_MAX_NR_PAGES)
566 goto out;
567
Avi Kivity6aa8b732006-12-10 02:21:36 -0800568 if (!npages)
569 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
570
Avi Kivity6aa8b732006-12-10 02:21:36 -0800571 new = old = *memslot;
572
Avi Kivitye36d96f2010-06-21 10:56:36 +0300573 new.id = mem->slot;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800574 new.base_gfn = base_gfn;
575 new.npages = npages;
576 new.flags = mem->flags;
577
578 /* Disallow changing a memory slot's size. */
579 r = -EINVAL;
580 if (npages && old.npages && npages != old.npages)
Sheng Yangf78e0e22007-10-29 09:40:42 +0800581 goto out_free;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800582
583 /* Check for overlaps */
584 r = -EEXIST;
585 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200586 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
Avi Kivity6aa8b732006-12-10 02:21:36 -0800587
Jan Kiszka4cd481f2009-04-13 11:59:32 +0200588 if (s == memslot || !s->npages)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800589 continue;
590 if (!((base_gfn + npages <= s->base_gfn) ||
591 (base_gfn >= s->base_gfn + s->npages)))
Sheng Yangf78e0e22007-10-29 09:40:42 +0800592 goto out_free;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800593 }
Avi Kivity6aa8b732006-12-10 02:21:36 -0800594
Avi Kivity6aa8b732006-12-10 02:21:36 -0800595 /* Free page dirty bitmap if unneeded */
596 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
Al Viro8b6d44c2007-02-09 16:38:40 +0000597 new.dirty_bitmap = NULL;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800598
599 r = -ENOMEM;
600
601 /* Allocate if a slot is being created */
Carsten Otteeff01142008-06-27 15:05:31 +0200602#ifndef CONFIG_S390
Anthony Liguori8d4e1282007-10-18 09:59:34 -0500603 if (npages && !new.rmap) {
Lai Jiangshan3bd89002010-06-02 17:01:23 +0800604 new.rmap = vmalloc(npages * sizeof(*new.rmap));
Izik Eidus290fc382007-09-27 14:11:22 +0200605
606 if (!new.rmap)
Sheng Yangf78e0e22007-10-29 09:40:42 +0800607 goto out_free;
Izik Eidus290fc382007-09-27 14:11:22 +0200608
Izik Eidus290fc382007-09-27 14:11:22 +0200609 memset(new.rmap, 0, npages * sizeof(*new.rmap));
Anthony Liguori8d4e1282007-10-18 09:59:34 -0500610
Izik Eidus80b14b52007-10-25 11:54:04 +0200611 new.user_alloc = user_alloc;
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200612 new.userspace_addr = mem->userspace_addr;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800613 }
Joerg Roedelec04b262009-06-19 15:16:23 +0200614 if (!npages)
615 goto skip_lpage;
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300616
Joerg Roedelec04b262009-06-19 15:16:23 +0200617 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
Heiko Carstens28bcb112009-09-03 17:35:35 +0200618 unsigned long ugfn;
619 unsigned long j;
620 int lpages;
Joerg Roedelec04b262009-06-19 15:16:23 +0200621 int level = i + 2;
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300622
Joerg Roedelec04b262009-06-19 15:16:23 +0200623 /* Avoid unused variable warning if no large pages */
624 (void)level;
625
626 if (new.lpage_info[i])
627 continue;
628
629 lpages = 1 + (base_gfn + npages - 1) /
630 KVM_PAGES_PER_HPAGE(level);
631 lpages -= base_gfn / KVM_PAGES_PER_HPAGE(level);
632
633 new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i]));
634
635 if (!new.lpage_info[i])
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300636 goto out_free;
637
Joerg Roedelec04b262009-06-19 15:16:23 +0200638 memset(new.lpage_info[i], 0,
639 lpages * sizeof(*new.lpage_info[i]));
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300640
Joerg Roedelec04b262009-06-19 15:16:23 +0200641 if (base_gfn % KVM_PAGES_PER_HPAGE(level))
642 new.lpage_info[i][0].write_count = 1;
643 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE(level))
644 new.lpage_info[i][lpages - 1].write_count = 1;
Avi Kivityac045272009-06-08 15:52:39 +0300645 ugfn = new.userspace_addr >> PAGE_SHIFT;
646 /*
647 * If the gfn and userspace address are not aligned wrt each
Marcelo Tosatti54dee992009-06-11 12:07:44 -0300648 * other, or if explicitly asked to, disable large page
649 * support for this slot
Avi Kivityac045272009-06-08 15:52:39 +0300650 */
Joerg Roedelec04b262009-06-19 15:16:23 +0200651 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
Marcelo Tosatti54dee992009-06-11 12:07:44 -0300652 !largepages_enabled)
Joerg Roedelec04b262009-06-19 15:16:23 +0200653 for (j = 0; j < lpages; ++j)
654 new.lpage_info[i][j].write_count = 1;
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300655 }
Avi Kivity6aa8b732006-12-10 02:21:36 -0800656
Joerg Roedelec04b262009-06-19 15:16:23 +0200657skip_lpage:
658
Avi Kivity6aa8b732006-12-10 02:21:36 -0800659 /* Allocate page dirty bitmap if needed */
660 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
Takuya Yoshikawa87bf6e72010-04-12 19:35:35 +0900661 unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800662
663 new.dirty_bitmap = vmalloc(dirty_bytes);
664 if (!new.dirty_bitmap)
Sheng Yangf78e0e22007-10-29 09:40:42 +0800665 goto out_free;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800666 memset(new.dirty_bitmap, 0, dirty_bytes);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200667 /* destroy any largepage mappings for dirty tracking */
Izik Eiduse244584f2009-06-10 19:23:24 +0300668 if (old.npages)
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200669 flush_shadow = 1;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800670 }
Christian Borntraeger3eea8432009-06-23 17:24:06 +0200671#else /* not defined CONFIG_S390 */
672 new.user_alloc = user_alloc;
673 if (user_alloc)
674 new.userspace_addr = mem->userspace_addr;
Carsten Otteeff01142008-06-27 15:05:31 +0200675#endif /* not defined CONFIG_S390 */
Avi Kivity6aa8b732006-12-10 02:21:36 -0800676
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200677 if (!npages) {
678 r = -ENOMEM;
679 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
680 if (!slots)
681 goto out_free;
682 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
683 if (mem->slot >= slots->nmemslots)
684 slots->nmemslots = mem->slot + 1;
685 slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
686
687 old_memslots = kvm->memslots;
688 rcu_assign_pointer(kvm->memslots, slots);
689 synchronize_srcu_expedited(&kvm->srcu);
690 /* From this point no new shadow pages pointing to a deleted
691 * memslot will be created.
692 *
693 * validation of sp->gfn happens in:
694 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
695 * - kvm_is_visible_gfn (mmu_check_roots)
696 */
Marcelo Tosatti34d4cb82008-07-10 20:49:31 -0300697 kvm_arch_flush_shadow(kvm);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200698 kfree(old_memslots);
699 }
Marcelo Tosatti34d4cb82008-07-10 20:49:31 -0300700
Marcelo Tosattif7784b82009-12-23 14:35:18 -0200701 r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
702 if (r)
703 goto out_free;
704
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200705#ifdef CONFIG_DMAR
706 /* map the pages in iommu page table */
707 if (npages) {
708 r = kvm_iommu_map_pages(kvm, &new);
709 if (r)
710 goto out_free;
711 }
712#endif
Andrea Arcangeli604b38a2008-07-25 16:32:03 +0200713
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200714 r = -ENOMEM;
715 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
716 if (!slots)
717 goto out_free;
718 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
719 if (mem->slot >= slots->nmemslots)
720 slots->nmemslots = mem->slot + 1;
721
722 /* actual memory is freed via old in kvm_free_physmem_slot below */
723 if (!npages) {
724 new.rmap = NULL;
725 new.dirty_bitmap = NULL;
726 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
727 new.lpage_info[i] = NULL;
728 }
729
730 slots->memslots[mem->slot] = new;
731 old_memslots = kvm->memslots;
732 rcu_assign_pointer(kvm->memslots, slots);
733 synchronize_srcu_expedited(&kvm->srcu);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800734
Marcelo Tosattif7784b82009-12-23 14:35:18 -0200735 kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
Zhang Xiantao3ad82a72007-11-20 13:11:38 +0800736
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200737 kvm_free_physmem_slot(&old, &new);
738 kfree(old_memslots);
739
740 if (flush_shadow)
741 kvm_arch_flush_shadow(kvm);
742
Avi Kivity6aa8b732006-12-10 02:21:36 -0800743 return 0;
744
Sheng Yangf78e0e22007-10-29 09:40:42 +0800745out_free:
Avi Kivity6aa8b732006-12-10 02:21:36 -0800746 kvm_free_physmem_slot(&new, &old);
747out:
748 return r;
Izik Eidus210c7c42007-10-24 23:52:57 +0200749
750}
Sheng Yangf78e0e22007-10-29 09:40:42 +0800751EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
752
753int kvm_set_memory_region(struct kvm *kvm,
754 struct kvm_userspace_memory_region *mem,
755 int user_alloc)
756{
757 int r;
758
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200759 mutex_lock(&kvm->slots_lock);
Sheng Yangf78e0e22007-10-29 09:40:42 +0800760 r = __kvm_set_memory_region(kvm, mem, user_alloc);
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200761 mutex_unlock(&kvm->slots_lock);
Sheng Yangf78e0e22007-10-29 09:40:42 +0800762 return r;
763}
Izik Eidus210c7c42007-10-24 23:52:57 +0200764EXPORT_SYMBOL_GPL(kvm_set_memory_region);
765
Carsten Otte1fe779f2007-10-29 16:08:35 +0100766int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
767 struct
768 kvm_userspace_memory_region *mem,
769 int user_alloc)
Izik Eidus210c7c42007-10-24 23:52:57 +0200770{
Izik Eiduse0d62c72007-10-24 23:57:46 +0200771 if (mem->slot >= KVM_MEMORY_SLOTS)
772 return -EINVAL;
Izik Eidus210c7c42007-10-24 23:52:57 +0200773 return kvm_set_memory_region(kvm, mem, user_alloc);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800774}
775
Zhang Xiantao5bb064d2007-11-18 20:29:43 +0800776int kvm_get_dirty_log(struct kvm *kvm,
777 struct kvm_dirty_log *log, int *is_dirty)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800778{
779 struct kvm_memory_slot *memslot;
780 int r, i;
Takuya Yoshikawa87bf6e72010-04-12 19:35:35 +0900781 unsigned long n;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800782 unsigned long any = 0;
783
Avi Kivity6aa8b732006-12-10 02:21:36 -0800784 r = -EINVAL;
785 if (log->slot >= KVM_MEMORY_SLOTS)
786 goto out;
787
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200788 memslot = &kvm->memslots->memslots[log->slot];
Avi Kivity6aa8b732006-12-10 02:21:36 -0800789 r = -ENOENT;
790 if (!memslot->dirty_bitmap)
791 goto out;
792
Takuya Yoshikawa87bf6e72010-04-12 19:35:35 +0900793 n = kvm_dirty_bitmap_bytes(memslot);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800794
Uri Lublincd1a4a92007-02-22 16:43:09 +0200795 for (i = 0; !any && i < n/sizeof(long); ++i)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800796 any = memslot->dirty_bitmap[i];
797
798 r = -EFAULT;
799 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
800 goto out;
801
Zhang Xiantao5bb064d2007-11-18 20:29:43 +0800802 if (any)
803 *is_dirty = 1;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800804
805 r = 0;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800806out:
Avi Kivity6aa8b732006-12-10 02:21:36 -0800807 return r;
808}
809
Marcelo Tosatti54dee992009-06-11 12:07:44 -0300810void kvm_disable_largepages(void)
811{
812 largepages_enabled = false;
813}
814EXPORT_SYMBOL_GPL(kvm_disable_largepages);
815
Izik Eiduscea7bb22007-10-17 19:17:48 +0200816int is_error_page(struct page *page)
817{
Huang Yingbf998152010-05-31 14:28:19 +0800818 return page == bad_page || page == hwpoison_page;
Izik Eiduscea7bb22007-10-17 19:17:48 +0200819}
820EXPORT_SYMBOL_GPL(is_error_page);
821
Anthony Liguori35149e22008-04-02 14:46:56 -0500822int is_error_pfn(pfn_t pfn)
823{
Huang Yingbf998152010-05-31 14:28:19 +0800824 return pfn == bad_pfn || pfn == hwpoison_pfn;
Anthony Liguori35149e22008-04-02 14:46:56 -0500825}
826EXPORT_SYMBOL_GPL(is_error_pfn);
827
Huang Yingbf998152010-05-31 14:28:19 +0800828int is_hwpoison_pfn(pfn_t pfn)
829{
830 return pfn == hwpoison_pfn;
831}
832EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
833
Izik Eidusf9d46eb2007-11-11 22:02:22 +0200834static inline unsigned long bad_hva(void)
835{
836 return PAGE_OFFSET;
837}
838
839int kvm_is_error_hva(unsigned long addr)
840{
841 return addr == bad_hva();
842}
843EXPORT_SYMBOL_GPL(kvm_is_error_hva);
844
Avi Kivitya1f4d3952010-06-21 11:44:20 +0300845struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800846{
847 int i;
Lai Jiangshan90d83dc2010-04-19 17:41:23 +0800848 struct kvm_memslots *slots = kvm_memslots(kvm);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800849
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200850 for (i = 0; i < slots->nmemslots; ++i) {
851 struct kvm_memory_slot *memslot = &slots->memslots[i];
Avi Kivity6aa8b732006-12-10 02:21:36 -0800852
853 if (gfn >= memslot->base_gfn
854 && gfn < memslot->base_gfn + memslot->npages)
855 return memslot;
856 }
Al Viro8b6d44c2007-02-09 16:38:40 +0000857 return NULL;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800858}
Avi Kivitya1f4d3952010-06-21 11:44:20 +0300859EXPORT_SYMBOL_GPL(gfn_to_memslot);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800860
Izik Eiduse0d62c72007-10-24 23:57:46 +0200861int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
862{
863 int i;
Lai Jiangshan90d83dc2010-04-19 17:41:23 +0800864 struct kvm_memslots *slots = kvm_memslots(kvm);
Izik Eiduse0d62c72007-10-24 23:57:46 +0200865
Izik Eiduse0d62c72007-10-24 23:57:46 +0200866 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200867 struct kvm_memory_slot *memslot = &slots->memslots[i];
Izik Eiduse0d62c72007-10-24 23:57:46 +0200868
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200869 if (memslot->flags & KVM_MEMSLOT_INVALID)
870 continue;
871
Izik Eiduse0d62c72007-10-24 23:57:46 +0200872 if (gfn >= memslot->base_gfn
873 && gfn < memslot->base_gfn + memslot->npages)
874 return 1;
875 }
876 return 0;
877}
878EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
879
Joerg Roedel8f0b1ab2010-01-28 12:37:56 +0100880unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
881{
882 struct vm_area_struct *vma;
883 unsigned long addr, size;
884
885 size = PAGE_SIZE;
886
887 addr = gfn_to_hva(kvm, gfn);
888 if (kvm_is_error_hva(addr))
889 return PAGE_SIZE;
890
891 down_read(&current->mm->mmap_sem);
892 vma = find_vma(current->mm, addr);
893 if (!vma)
894 goto out;
895
896 size = vma_kernel_pagesize(vma);
897
898out:
899 up_read(&current->mm->mmap_sem);
900
901 return size;
902}
903
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200904int memslot_id(struct kvm *kvm, gfn_t gfn)
905{
906 int i;
Lai Jiangshan90d83dc2010-04-19 17:41:23 +0800907 struct kvm_memslots *slots = kvm_memslots(kvm);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200908 struct kvm_memory_slot *memslot = NULL;
909
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200910 for (i = 0; i < slots->nmemslots; ++i) {
911 memslot = &slots->memslots[i];
912
913 if (gfn >= memslot->base_gfn
914 && gfn < memslot->base_gfn + memslot->npages)
915 break;
916 }
917
918 return memslot - slots->memslots;
919}
920
Takuya Yoshikawaf5c98032010-02-25 11:33:19 +0900921static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
922{
923 return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
924}
925
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300926unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
Izik Eidus539cb662007-11-11 22:05:04 +0200927{
928 struct kvm_memory_slot *slot;
929
Avi Kivitya1f4d3952010-06-21 11:44:20 +0300930 slot = gfn_to_memslot(kvm, gfn);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200931 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
Izik Eidus539cb662007-11-11 22:05:04 +0200932 return bad_hva();
Takuya Yoshikawaf5c98032010-02-25 11:33:19 +0900933 return gfn_to_hva_memslot(slot, gfn);
Izik Eidus539cb662007-11-11 22:05:04 +0200934}
Sheng Yang0d150292008-04-25 21:44:50 +0800935EXPORT_SYMBOL_GPL(gfn_to_hva);
Izik Eidus539cb662007-11-11 22:05:04 +0200936
Marcelo Tosatti506f0d62009-12-23 14:35:19 -0200937static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr)
Avi Kivity954bbbc2007-03-30 14:02:32 +0300938{
Anthony Liguori8d4e1282007-10-18 09:59:34 -0500939 struct page *page[1];
940 int npages;
Anthony Liguori2e2e3732008-04-30 15:37:07 -0500941 pfn_t pfn;
Avi Kivity954bbbc2007-03-30 14:02:32 +0300942
Avi Kivity60395222007-10-21 11:03:36 +0200943 might_sleep();
944
Marcelo Tosatti4c2155c2008-09-16 20:54:47 -0300945 npages = get_user_pages_fast(addr, 1, 1, page);
Izik Eidus539cb662007-11-11 22:05:04 +0200946
Anthony Liguori2e2e3732008-04-30 15:37:07 -0500947 if (unlikely(npages != 1)) {
948 struct vm_area_struct *vma;
Anthony Liguori8d4e1282007-10-18 09:59:34 -0500949
Huang Yingbf998152010-05-31 14:28:19 +0800950 if (is_hwpoison_address(addr)) {
951 get_page(hwpoison_page);
952 return page_to_pfn(hwpoison_page);
953 }
954
Marcelo Tosatti4c2155c2008-09-16 20:54:47 -0300955 down_read(&current->mm->mmap_sem);
Anthony Liguori2e2e3732008-04-30 15:37:07 -0500956 vma = find_vma(current->mm, addr);
Marcelo Tosatti4c2155c2008-09-16 20:54:47 -0300957
Anthony Liguori2e2e3732008-04-30 15:37:07 -0500958 if (vma == NULL || addr < vma->vm_start ||
959 !(vma->vm_flags & VM_PFNMAP)) {
Marcelo Tosatti4c2155c2008-09-16 20:54:47 -0300960 up_read(&current->mm->mmap_sem);
Anthony Liguori2e2e3732008-04-30 15:37:07 -0500961 get_page(bad_page);
962 return page_to_pfn(bad_page);
963 }
964
965 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
Marcelo Tosatti4c2155c2008-09-16 20:54:47 -0300966 up_read(&current->mm->mmap_sem);
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +0800967 BUG_ON(!kvm_is_mmio_pfn(pfn));
Anthony Liguori2e2e3732008-04-30 15:37:07 -0500968 } else
969 pfn = page_to_pfn(page[0]);
970
971 return pfn;
Anthony Liguori35149e22008-04-02 14:46:56 -0500972}
973
Marcelo Tosatti506f0d62009-12-23 14:35:19 -0200974pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
975{
976 unsigned long addr;
977
978 addr = gfn_to_hva(kvm, gfn);
979 if (kvm_is_error_hva(addr)) {
980 get_page(bad_page);
981 return page_to_pfn(bad_page);
982 }
983
984 return hva_to_pfn(kvm, addr);
985}
Anthony Liguori35149e22008-04-02 14:46:56 -0500986EXPORT_SYMBOL_GPL(gfn_to_pfn);
987
Marcelo Tosatti506f0d62009-12-23 14:35:19 -0200988pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
989 struct kvm_memory_slot *slot, gfn_t gfn)
990{
991 unsigned long addr = gfn_to_hva_memslot(slot, gfn);
992 return hva_to_pfn(kvm, addr);
993}
994
Anthony Liguori35149e22008-04-02 14:46:56 -0500995struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
996{
Anthony Liguori2e2e3732008-04-30 15:37:07 -0500997 pfn_t pfn;
998
999 pfn = gfn_to_pfn(kvm, gfn);
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001000 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001001 return pfn_to_page(pfn);
1002
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001003 WARN_ON(kvm_is_mmio_pfn(pfn));
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001004
1005 get_page(bad_page);
1006 return bad_page;
Avi Kivity954bbbc2007-03-30 14:02:32 +03001007}
Anthony Liguoriaab61cc2007-10-29 15:15:20 -05001008
Avi Kivity954bbbc2007-03-30 14:02:32 +03001009EXPORT_SYMBOL_GPL(gfn_to_page);
1010
Izik Eidusb4231d62007-11-20 11:49:33 +02001011void kvm_release_page_clean(struct page *page)
1012{
Anthony Liguori35149e22008-04-02 14:46:56 -05001013 kvm_release_pfn_clean(page_to_pfn(page));
Izik Eidusb4231d62007-11-20 11:49:33 +02001014}
1015EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1016
Anthony Liguori35149e22008-04-02 14:46:56 -05001017void kvm_release_pfn_clean(pfn_t pfn)
1018{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001019 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001020 put_page(pfn_to_page(pfn));
Anthony Liguori35149e22008-04-02 14:46:56 -05001021}
1022EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1023
Izik Eidusb4231d62007-11-20 11:49:33 +02001024void kvm_release_page_dirty(struct page *page)
Izik Eidus8a7ae052007-10-18 11:09:33 +02001025{
Anthony Liguori35149e22008-04-02 14:46:56 -05001026 kvm_release_pfn_dirty(page_to_pfn(page));
Izik Eidus8a7ae052007-10-18 11:09:33 +02001027}
Izik Eidusb4231d62007-11-20 11:49:33 +02001028EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
Izik Eidus8a7ae052007-10-18 11:09:33 +02001029
Anthony Liguori35149e22008-04-02 14:46:56 -05001030void kvm_release_pfn_dirty(pfn_t pfn)
1031{
1032 kvm_set_pfn_dirty(pfn);
1033 kvm_release_pfn_clean(pfn);
1034}
1035EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1036
1037void kvm_set_page_dirty(struct page *page)
1038{
1039 kvm_set_pfn_dirty(page_to_pfn(page));
1040}
1041EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1042
1043void kvm_set_pfn_dirty(pfn_t pfn)
1044{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001045 if (!kvm_is_mmio_pfn(pfn)) {
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001046 struct page *page = pfn_to_page(pfn);
1047 if (!PageReserved(page))
1048 SetPageDirty(page);
1049 }
Anthony Liguori35149e22008-04-02 14:46:56 -05001050}
1051EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1052
1053void kvm_set_pfn_accessed(pfn_t pfn)
1054{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001055 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001056 mark_page_accessed(pfn_to_page(pfn));
Anthony Liguori35149e22008-04-02 14:46:56 -05001057}
1058EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1059
1060void kvm_get_pfn(pfn_t pfn)
1061{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001062 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001063 get_page(pfn_to_page(pfn));
Anthony Liguori35149e22008-04-02 14:46:56 -05001064}
1065EXPORT_SYMBOL_GPL(kvm_get_pfn);
1066
Izik Eidus195aefd2007-10-01 22:14:18 +02001067static int next_segment(unsigned long len, int offset)
1068{
1069 if (len > PAGE_SIZE - offset)
1070 return PAGE_SIZE - offset;
1071 else
1072 return len;
1073}
1074
1075int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1076 int len)
1077{
Izik Eiduse0506bc2007-11-11 22:10:22 +02001078 int r;
1079 unsigned long addr;
Izik Eidus195aefd2007-10-01 22:14:18 +02001080
Izik Eiduse0506bc2007-11-11 22:10:22 +02001081 addr = gfn_to_hva(kvm, gfn);
1082 if (kvm_is_error_hva(addr))
Izik Eidus195aefd2007-10-01 22:14:18 +02001083 return -EFAULT;
Izik Eiduse0506bc2007-11-11 22:10:22 +02001084 r = copy_from_user(data, (void __user *)addr + offset, len);
1085 if (r)
1086 return -EFAULT;
Izik Eidus195aefd2007-10-01 22:14:18 +02001087 return 0;
1088}
1089EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1090
1091int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1092{
1093 gfn_t gfn = gpa >> PAGE_SHIFT;
1094 int seg;
1095 int offset = offset_in_page(gpa);
1096 int ret;
1097
1098 while ((seg = next_segment(len, offset)) != 0) {
1099 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1100 if (ret < 0)
1101 return ret;
1102 offset = 0;
1103 len -= seg;
1104 data += seg;
1105 ++gfn;
1106 }
1107 return 0;
1108}
1109EXPORT_SYMBOL_GPL(kvm_read_guest);
1110
Marcelo Tosatti7ec54582007-12-20 19:18:23 -05001111int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1112 unsigned long len)
1113{
1114 int r;
1115 unsigned long addr;
1116 gfn_t gfn = gpa >> PAGE_SHIFT;
1117 int offset = offset_in_page(gpa);
1118
1119 addr = gfn_to_hva(kvm, gfn);
1120 if (kvm_is_error_hva(addr))
1121 return -EFAULT;
Andrea Arcangeli0aac03f2008-01-30 19:57:35 +01001122 pagefault_disable();
Marcelo Tosatti7ec54582007-12-20 19:18:23 -05001123 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
Andrea Arcangeli0aac03f2008-01-30 19:57:35 +01001124 pagefault_enable();
Marcelo Tosatti7ec54582007-12-20 19:18:23 -05001125 if (r)
1126 return -EFAULT;
1127 return 0;
1128}
1129EXPORT_SYMBOL(kvm_read_guest_atomic);
1130
Izik Eidus195aefd2007-10-01 22:14:18 +02001131int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1132 int offset, int len)
1133{
Izik Eiduse0506bc2007-11-11 22:10:22 +02001134 int r;
1135 unsigned long addr;
Izik Eidus195aefd2007-10-01 22:14:18 +02001136
Izik Eiduse0506bc2007-11-11 22:10:22 +02001137 addr = gfn_to_hva(kvm, gfn);
1138 if (kvm_is_error_hva(addr))
Izik Eidus195aefd2007-10-01 22:14:18 +02001139 return -EFAULT;
Izik Eiduse0506bc2007-11-11 22:10:22 +02001140 r = copy_to_user((void __user *)addr + offset, data, len);
1141 if (r)
1142 return -EFAULT;
Izik Eidus195aefd2007-10-01 22:14:18 +02001143 mark_page_dirty(kvm, gfn);
1144 return 0;
1145}
1146EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1147
1148int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1149 unsigned long len)
1150{
1151 gfn_t gfn = gpa >> PAGE_SHIFT;
1152 int seg;
1153 int offset = offset_in_page(gpa);
1154 int ret;
1155
1156 while ((seg = next_segment(len, offset)) != 0) {
1157 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1158 if (ret < 0)
1159 return ret;
1160 offset = 0;
1161 len -= seg;
1162 data += seg;
1163 ++gfn;
1164 }
1165 return 0;
1166}
1167
1168int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1169{
Izik Eidus3e021bf2007-11-19 11:16:57 +02001170 return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
Izik Eidus195aefd2007-10-01 22:14:18 +02001171}
1172EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1173
1174int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1175{
1176 gfn_t gfn = gpa >> PAGE_SHIFT;
1177 int seg;
1178 int offset = offset_in_page(gpa);
1179 int ret;
1180
1181 while ((seg = next_segment(len, offset)) != 0) {
1182 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1183 if (ret < 0)
1184 return ret;
1185 offset = 0;
1186 len -= seg;
1187 ++gfn;
1188 }
1189 return 0;
1190}
1191EXPORT_SYMBOL_GPL(kvm_clear_guest);
1192
Avi Kivity6aa8b732006-12-10 02:21:36 -08001193void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1194{
Nguyen Anh Quynh31389942007-06-05 10:35:19 +03001195 struct kvm_memory_slot *memslot;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001196
Avi Kivitya1f4d3952010-06-21 11:44:20 +03001197 memslot = gfn_to_memslot(kvm, gfn);
Rusty Russell7e9d6192007-07-31 20:41:14 +10001198 if (memslot && memslot->dirty_bitmap) {
1199 unsigned long rel_gfn = gfn - memslot->base_gfn;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001200
Takuya Yoshikawad1476932010-04-23 17:48:35 +09001201 generic___set_le_bit(rel_gfn, memslot->dirty_bitmap);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001202 }
1203}
1204
Eddie Dongb6958ce2007-07-18 12:15:21 +03001205/*
1206 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1207 */
Hollis Blanchard8776e512007-10-31 17:24:24 -05001208void kvm_vcpu_block(struct kvm_vcpu *vcpu)
Eddie Dongb6958ce2007-07-18 12:15:21 +03001209{
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001210 DEFINE_WAIT(wait);
Eddie Dongb6958ce2007-07-18 12:15:21 +03001211
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001212 for (;;) {
1213 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
Eddie Dongb6958ce2007-07-18 12:15:21 +03001214
Gleb Natapova1b37102009-07-09 15:33:52 +03001215 if (kvm_arch_vcpu_runnable(vcpu)) {
Avi Kivitya8eeb042010-05-10 12:34:53 +03001216 kvm_make_request(KVM_REQ_UNHALT, vcpu);
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001217 break;
Marcelo Tosattid7690172008-09-08 15:23:48 -03001218 }
Gleb Natapov09cec752009-03-23 15:11:44 +02001219 if (kvm_cpu_has_pending_timer(vcpu))
1220 break;
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001221 if (signal_pending(current))
1222 break;
1223
Eddie Dongb6958ce2007-07-18 12:15:21 +03001224 schedule();
Eddie Dongb6958ce2007-07-18 12:15:21 +03001225 }
1226
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001227 finish_wait(&vcpu->wq, &wait);
Eddie Dongb6958ce2007-07-18 12:15:21 +03001228}
1229
Avi Kivity6aa8b732006-12-10 02:21:36 -08001230void kvm_resched(struct kvm_vcpu *vcpu)
1231{
Yaozu Dong3fca0362007-04-25 16:49:19 +03001232 if (!need_resched())
1233 return;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001234 cond_resched();
Avi Kivity6aa8b732006-12-10 02:21:36 -08001235}
1236EXPORT_SYMBOL_GPL(kvm_resched);
1237
Zhai, Edwind255f4f2009-10-09 18:03:20 +08001238void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu)
1239{
1240 ktime_t expires;
1241 DEFINE_WAIT(wait);
1242
1243 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1244
1245 /* Sleep for 100 us, and hope lock-holder got scheduled */
1246 expires = ktime_add_ns(ktime_get(), 100000UL);
1247 schedule_hrtimeout(&expires, HRTIMER_MODE_ABS);
1248
1249 finish_wait(&vcpu->wq, &wait);
1250}
1251EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1252
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001253static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001254{
1255 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001256 struct page *page;
1257
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001258 if (vmf->pgoff == 0)
Avi Kivity039576c2007-03-20 12:46:50 +02001259 page = virt_to_page(vcpu->run);
Avi Kivity09566762008-01-23 18:14:23 +02001260#ifdef CONFIG_X86
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001261 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
Zhang Xiantaoad312c72007-12-13 23:50:52 +08001262 page = virt_to_page(vcpu->arch.pio_data);
Avi Kivity09566762008-01-23 18:14:23 +02001263#endif
Laurent Vivier5f94c172008-05-30 16:05:54 +02001264#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1265 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1266 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1267#endif
Avi Kivity039576c2007-03-20 12:46:50 +02001268 else
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001269 return VM_FAULT_SIGBUS;
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001270 get_page(page);
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001271 vmf->page = page;
1272 return 0;
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001273}
1274
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +04001275static const struct vm_operations_struct kvm_vcpu_vm_ops = {
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001276 .fault = kvm_vcpu_fault,
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001277};
1278
1279static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1280{
1281 vma->vm_ops = &kvm_vcpu_vm_ops;
1282 return 0;
1283}
1284
Avi Kivitybccf2152007-02-21 18:04:26 +02001285static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1286{
1287 struct kvm_vcpu *vcpu = filp->private_data;
1288
Al Viro66c0b392008-04-19 20:33:56 +01001289 kvm_put_kvm(vcpu->kvm);
Avi Kivitybccf2152007-02-21 18:04:26 +02001290 return 0;
1291}
1292
Christian Borntraeger3d3aab12008-12-02 11:17:32 +01001293static struct file_operations kvm_vcpu_fops = {
Avi Kivitybccf2152007-02-21 18:04:26 +02001294 .release = kvm_vcpu_release,
1295 .unlocked_ioctl = kvm_vcpu_ioctl,
1296 .compat_ioctl = kvm_vcpu_ioctl,
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001297 .mmap = kvm_vcpu_mmap,
Avi Kivitybccf2152007-02-21 18:04:26 +02001298};
1299
1300/*
1301 * Allocates an inode for the vcpu.
1302 */
1303static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1304{
Roland Dreier628ff7c2009-12-18 09:41:24 -08001305 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
Avi Kivitybccf2152007-02-21 18:04:26 +02001306}
1307
Avi Kivityc5ea7662007-02-20 18:41:05 +02001308/*
1309 * Creates some virtual cpus. Good luck creating more than one.
1310 */
Gleb Natapov73880c82009-06-09 15:56:28 +03001311static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
Avi Kivityc5ea7662007-02-20 18:41:05 +02001312{
1313 int r;
Gleb Natapov988a2ca2009-06-09 15:56:29 +03001314 struct kvm_vcpu *vcpu, *v;
Avi Kivityc5ea7662007-02-20 18:41:05 +02001315
Gleb Natapov73880c82009-06-09 15:56:28 +03001316 vcpu = kvm_arch_vcpu_create(kvm, id);
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001317 if (IS_ERR(vcpu))
1318 return PTR_ERR(vcpu);
Avi Kivityc5ea7662007-02-20 18:41:05 +02001319
Avi Kivity15ad7142007-07-11 18:17:21 +03001320 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1321
Avi Kivity26e52152007-11-20 15:30:24 +02001322 r = kvm_arch_vcpu_setup(vcpu);
1323 if (r)
Glauber Costa7d8fece2008-09-17 23:16:59 -03001324 return r;
Avi Kivity26e52152007-11-20 15:30:24 +02001325
Shaohua Li11ec2802007-07-23 14:51:37 +08001326 mutex_lock(&kvm->lock);
Gleb Natapov73880c82009-06-09 15:56:28 +03001327 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1328 r = -EINVAL;
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08001329 goto vcpu_destroy;
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001330 }
Gleb Natapov73880c82009-06-09 15:56:28 +03001331
Gleb Natapov988a2ca2009-06-09 15:56:29 +03001332 kvm_for_each_vcpu(r, v, kvm)
1333 if (v->vcpu_id == id) {
Gleb Natapov73880c82009-06-09 15:56:28 +03001334 r = -EEXIST;
1335 goto vcpu_destroy;
1336 }
1337
1338 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001339
1340 /* Now it's all set up, let userspace reach it */
Al Viro66c0b392008-04-19 20:33:56 +01001341 kvm_get_kvm(kvm);
Avi Kivitybccf2152007-02-21 18:04:26 +02001342 r = create_vcpu_fd(vcpu);
Gleb Natapov73880c82009-06-09 15:56:28 +03001343 if (r < 0) {
1344 kvm_put_kvm(kvm);
1345 goto vcpu_destroy;
1346 }
1347
1348 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1349 smp_wmb();
1350 atomic_inc(&kvm->online_vcpus);
1351
1352#ifdef CONFIG_KVM_APIC_ARCHITECTURE
1353 if (kvm->bsp_vcpu_id == id)
1354 kvm->bsp_vcpu = vcpu;
1355#endif
1356 mutex_unlock(&kvm->lock);
Avi Kivitybccf2152007-02-21 18:04:26 +02001357 return r;
Avi Kivityc5ea7662007-02-20 18:41:05 +02001358
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08001359vcpu_destroy:
Glauber Costa7d8fece2008-09-17 23:16:59 -03001360 mutex_unlock(&kvm->lock);
Hollis Blanchardd40ccc62007-11-19 14:04:43 -06001361 kvm_arch_vcpu_destroy(vcpu);
Avi Kivityc5ea7662007-02-20 18:41:05 +02001362 return r;
1363}
1364
Avi Kivity1961d272007-03-05 19:46:05 +02001365static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1366{
1367 if (sigset) {
1368 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1369 vcpu->sigset_active = 1;
1370 vcpu->sigset = *sigset;
1371 } else
1372 vcpu->sigset_active = 0;
1373 return 0;
1374}
1375
Avi Kivitybccf2152007-02-21 18:04:26 +02001376static long kvm_vcpu_ioctl(struct file *filp,
1377 unsigned int ioctl, unsigned long arg)
Avi Kivity6aa8b732006-12-10 02:21:36 -08001378{
Avi Kivitybccf2152007-02-21 18:04:26 +02001379 struct kvm_vcpu *vcpu = filp->private_data;
Al Viro2f3669872007-02-09 16:38:35 +00001380 void __user *argp = (void __user *)arg;
Carsten Otte313a3dc2007-10-11 19:16:52 +02001381 int r;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001382 struct kvm_fpu *fpu = NULL;
1383 struct kvm_sregs *kvm_sregs = NULL;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001384
Avi Kivity6d4e4c42007-11-21 16:41:05 +02001385 if (vcpu->kvm->mm != current->mm)
1386 return -EIO;
Avi Kivity2122ff52010-05-13 11:25:04 +03001387
1388#if defined(CONFIG_S390) || defined(CONFIG_PPC)
1389 /*
1390 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1391 * so vcpu_load() would break it.
1392 */
1393 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1394 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1395#endif
1396
1397
1398 vcpu_load(vcpu);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001399 switch (ioctl) {
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001400 case KVM_RUN:
Avi Kivityf0fe5102007-03-07 13:11:17 +02001401 r = -EINVAL;
1402 if (arg)
1403 goto out;
Hollis Blanchardb6c7a5d2007-11-01 14:16:10 -05001404 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001405 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001406 case KVM_GET_REGS: {
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001407 struct kvm_regs *kvm_regs;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001408
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001409 r = -ENOMEM;
1410 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1411 if (!kvm_regs)
1412 goto out;
1413 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001414 if (r)
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001415 goto out_free1;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001416 r = -EFAULT;
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001417 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1418 goto out_free1;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001419 r = 0;
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001420out_free1:
1421 kfree(kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001422 break;
1423 }
1424 case KVM_SET_REGS: {
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001425 struct kvm_regs *kvm_regs;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001426
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001427 r = -ENOMEM;
1428 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1429 if (!kvm_regs)
1430 goto out;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001431 r = -EFAULT;
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001432 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1433 goto out_free2;
1434 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001435 if (r)
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001436 goto out_free2;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001437 r = 0;
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001438out_free2:
1439 kfree(kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001440 break;
1441 }
1442 case KVM_GET_SREGS: {
Dave Hansenfa3795a2008-08-11 10:01:46 -07001443 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1444 r = -ENOMEM;
1445 if (!kvm_sregs)
1446 goto out;
1447 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001448 if (r)
1449 goto out;
1450 r = -EFAULT;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001451 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001452 goto out;
1453 r = 0;
1454 break;
1455 }
1456 case KVM_SET_SREGS: {
Dave Hansenfa3795a2008-08-11 10:01:46 -07001457 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1458 r = -ENOMEM;
1459 if (!kvm_sregs)
Avi Kivity6aa8b732006-12-10 02:21:36 -08001460 goto out;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001461 r = -EFAULT;
1462 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1463 goto out;
1464 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001465 if (r)
1466 goto out;
1467 r = 0;
1468 break;
1469 }
Marcelo Tosatti62d9f0d2008-04-11 13:24:45 -03001470 case KVM_GET_MP_STATE: {
1471 struct kvm_mp_state mp_state;
1472
1473 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1474 if (r)
1475 goto out;
1476 r = -EFAULT;
1477 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1478 goto out;
1479 r = 0;
1480 break;
1481 }
1482 case KVM_SET_MP_STATE: {
1483 struct kvm_mp_state mp_state;
1484
1485 r = -EFAULT;
1486 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1487 goto out;
1488 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1489 if (r)
1490 goto out;
1491 r = 0;
1492 break;
1493 }
Avi Kivity6aa8b732006-12-10 02:21:36 -08001494 case KVM_TRANSLATE: {
1495 struct kvm_translation tr;
1496
1497 r = -EFAULT;
Al Viro2f3669872007-02-09 16:38:35 +00001498 if (copy_from_user(&tr, argp, sizeof tr))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001499 goto out;
Zhang Xiantao8b006792007-11-16 13:05:55 +08001500 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001501 if (r)
1502 goto out;
1503 r = -EFAULT;
Al Viro2f3669872007-02-09 16:38:35 +00001504 if (copy_to_user(argp, &tr, sizeof tr))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001505 goto out;
1506 r = 0;
1507 break;
1508 }
Jan Kiszkad0bfb942008-12-15 13:52:10 +01001509 case KVM_SET_GUEST_DEBUG: {
1510 struct kvm_guest_debug dbg;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001511
1512 r = -EFAULT;
Al Viro2f3669872007-02-09 16:38:35 +00001513 if (copy_from_user(&dbg, argp, sizeof dbg))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001514 goto out;
Jan Kiszkad0bfb942008-12-15 13:52:10 +01001515 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001516 if (r)
1517 goto out;
1518 r = 0;
1519 break;
1520 }
Avi Kivity1961d272007-03-05 19:46:05 +02001521 case KVM_SET_SIGNAL_MASK: {
1522 struct kvm_signal_mask __user *sigmask_arg = argp;
1523 struct kvm_signal_mask kvm_sigmask;
1524 sigset_t sigset, *p;
1525
1526 p = NULL;
1527 if (argp) {
1528 r = -EFAULT;
1529 if (copy_from_user(&kvm_sigmask, argp,
1530 sizeof kvm_sigmask))
1531 goto out;
1532 r = -EINVAL;
1533 if (kvm_sigmask.len != sizeof sigset)
1534 goto out;
1535 r = -EFAULT;
1536 if (copy_from_user(&sigset, sigmask_arg->sigset,
1537 sizeof sigset))
1538 goto out;
1539 p = &sigset;
1540 }
Andi Kleen376d41f2010-06-10 13:10:47 +02001541 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
Avi Kivity1961d272007-03-05 19:46:05 +02001542 break;
1543 }
Avi Kivityb8836732007-04-01 16:34:31 +03001544 case KVM_GET_FPU: {
Dave Hansenfa3795a2008-08-11 10:01:46 -07001545 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1546 r = -ENOMEM;
1547 if (!fpu)
1548 goto out;
1549 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
Avi Kivityb8836732007-04-01 16:34:31 +03001550 if (r)
1551 goto out;
1552 r = -EFAULT;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001553 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
Avi Kivityb8836732007-04-01 16:34:31 +03001554 goto out;
1555 r = 0;
1556 break;
1557 }
1558 case KVM_SET_FPU: {
Dave Hansenfa3795a2008-08-11 10:01:46 -07001559 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1560 r = -ENOMEM;
1561 if (!fpu)
Avi Kivityb8836732007-04-01 16:34:31 +03001562 goto out;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001563 r = -EFAULT;
1564 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1565 goto out;
1566 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
Avi Kivityb8836732007-04-01 16:34:31 +03001567 if (r)
1568 goto out;
1569 r = 0;
1570 break;
1571 }
Avi Kivitybccf2152007-02-21 18:04:26 +02001572 default:
Carsten Otte313a3dc2007-10-11 19:16:52 +02001573 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
Avi Kivitybccf2152007-02-21 18:04:26 +02001574 }
1575out:
Avi Kivity2122ff52010-05-13 11:25:04 +03001576 vcpu_put(vcpu);
Dave Hansenfa3795a2008-08-11 10:01:46 -07001577 kfree(fpu);
1578 kfree(kvm_sregs);
Avi Kivitybccf2152007-02-21 18:04:26 +02001579 return r;
1580}
1581
1582static long kvm_vm_ioctl(struct file *filp,
1583 unsigned int ioctl, unsigned long arg)
1584{
1585 struct kvm *kvm = filp->private_data;
1586 void __user *argp = (void __user *)arg;
Carsten Otte1fe779f2007-10-29 16:08:35 +01001587 int r;
Avi Kivitybccf2152007-02-21 18:04:26 +02001588
Avi Kivity6d4e4c42007-11-21 16:41:05 +02001589 if (kvm->mm != current->mm)
1590 return -EIO;
Avi Kivitybccf2152007-02-21 18:04:26 +02001591 switch (ioctl) {
1592 case KVM_CREATE_VCPU:
1593 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1594 if (r < 0)
1595 goto out;
1596 break;
Izik Eidus6fc138d2007-10-09 19:20:39 +02001597 case KVM_SET_USER_MEMORY_REGION: {
1598 struct kvm_userspace_memory_region kvm_userspace_mem;
1599
1600 r = -EFAULT;
1601 if (copy_from_user(&kvm_userspace_mem, argp,
1602 sizeof kvm_userspace_mem))
1603 goto out;
1604
1605 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001606 if (r)
1607 goto out;
1608 break;
1609 }
1610 case KVM_GET_DIRTY_LOG: {
1611 struct kvm_dirty_log log;
1612
1613 r = -EFAULT;
Al Viro2f3669872007-02-09 16:38:35 +00001614 if (copy_from_user(&log, argp, sizeof log))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001615 goto out;
Avi Kivity2c6f5df2007-02-20 18:27:58 +02001616 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001617 if (r)
1618 goto out;
1619 break;
1620 }
Laurent Vivier5f94c172008-05-30 16:05:54 +02001621#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1622 case KVM_REGISTER_COALESCED_MMIO: {
1623 struct kvm_coalesced_mmio_zone zone;
1624 r = -EFAULT;
1625 if (copy_from_user(&zone, argp, sizeof zone))
1626 goto out;
Laurent Vivier5f94c172008-05-30 16:05:54 +02001627 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1628 if (r)
1629 goto out;
1630 r = 0;
1631 break;
1632 }
1633 case KVM_UNREGISTER_COALESCED_MMIO: {
1634 struct kvm_coalesced_mmio_zone zone;
1635 r = -EFAULT;
1636 if (copy_from_user(&zone, argp, sizeof zone))
1637 goto out;
Laurent Vivier5f94c172008-05-30 16:05:54 +02001638 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1639 if (r)
1640 goto out;
1641 r = 0;
1642 break;
1643 }
1644#endif
Gregory Haskins721eecb2009-05-20 10:30:49 -04001645 case KVM_IRQFD: {
1646 struct kvm_irqfd data;
1647
1648 r = -EFAULT;
1649 if (copy_from_user(&data, argp, sizeof data))
1650 goto out;
1651 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
1652 break;
1653 }
Gregory Haskinsd34e6b12009-07-07 17:08:49 -04001654 case KVM_IOEVENTFD: {
1655 struct kvm_ioeventfd data;
1656
1657 r = -EFAULT;
1658 if (copy_from_user(&data, argp, sizeof data))
1659 goto out;
1660 r = kvm_ioeventfd(kvm, &data);
1661 break;
1662 }
Gleb Natapov73880c82009-06-09 15:56:28 +03001663#ifdef CONFIG_KVM_APIC_ARCHITECTURE
1664 case KVM_SET_BOOT_CPU_ID:
1665 r = 0;
Marcelo Tosatti894a9c52009-06-23 15:05:14 -03001666 mutex_lock(&kvm->lock);
Gleb Natapov73880c82009-06-09 15:56:28 +03001667 if (atomic_read(&kvm->online_vcpus) != 0)
1668 r = -EBUSY;
1669 else
1670 kvm->bsp_vcpu_id = arg;
Marcelo Tosatti894a9c52009-06-23 15:05:14 -03001671 mutex_unlock(&kvm->lock);
Gleb Natapov73880c82009-06-09 15:56:28 +03001672 break;
1673#endif
Avi Kivityf17abe92007-02-21 19:28:04 +02001674 default:
Carsten Otte1fe779f2007-10-29 16:08:35 +01001675 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
Avi Kivitybfd99ff2009-08-26 14:57:50 +03001676 if (r == -ENOTTY)
1677 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
Avi Kivityf17abe92007-02-21 19:28:04 +02001678 }
1679out:
1680 return r;
1681}
1682
Arnd Bergmann6ff58942009-10-22 14:19:27 +02001683#ifdef CONFIG_COMPAT
1684struct compat_kvm_dirty_log {
1685 __u32 slot;
1686 __u32 padding1;
1687 union {
1688 compat_uptr_t dirty_bitmap; /* one bit per page */
1689 __u64 padding2;
1690 };
1691};
1692
1693static long kvm_vm_compat_ioctl(struct file *filp,
1694 unsigned int ioctl, unsigned long arg)
1695{
1696 struct kvm *kvm = filp->private_data;
1697 int r;
1698
1699 if (kvm->mm != current->mm)
1700 return -EIO;
1701 switch (ioctl) {
1702 case KVM_GET_DIRTY_LOG: {
1703 struct compat_kvm_dirty_log compat_log;
1704 struct kvm_dirty_log log;
1705
1706 r = -EFAULT;
1707 if (copy_from_user(&compat_log, (void __user *)arg,
1708 sizeof(compat_log)))
1709 goto out;
1710 log.slot = compat_log.slot;
1711 log.padding1 = compat_log.padding1;
1712 log.padding2 = compat_log.padding2;
1713 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
1714
1715 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1716 if (r)
1717 goto out;
1718 break;
1719 }
1720 default:
1721 r = kvm_vm_ioctl(filp, ioctl, arg);
1722 }
1723
1724out:
1725 return r;
1726}
1727#endif
1728
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001729static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Avi Kivityf17abe92007-02-21 19:28:04 +02001730{
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03001731 struct page *page[1];
1732 unsigned long addr;
1733 int npages;
1734 gfn_t gfn = vmf->pgoff;
Avi Kivityf17abe92007-02-21 19:28:04 +02001735 struct kvm *kvm = vma->vm_file->private_data;
Avi Kivityf17abe92007-02-21 19:28:04 +02001736
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03001737 addr = gfn_to_hva(kvm, gfn);
1738 if (kvm_is_error_hva(addr))
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001739 return VM_FAULT_SIGBUS;
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03001740
1741 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
1742 NULL);
1743 if (unlikely(npages != 1))
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001744 return VM_FAULT_SIGBUS;
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03001745
1746 vmf->page = page[0];
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001747 return 0;
Avi Kivityf17abe92007-02-21 19:28:04 +02001748}
1749
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +04001750static const struct vm_operations_struct kvm_vm_vm_ops = {
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001751 .fault = kvm_vm_fault,
Avi Kivityf17abe92007-02-21 19:28:04 +02001752};
1753
1754static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1755{
1756 vma->vm_ops = &kvm_vm_vm_ops;
1757 return 0;
1758}
1759
Christian Borntraeger3d3aab12008-12-02 11:17:32 +01001760static struct file_operations kvm_vm_fops = {
Avi Kivityf17abe92007-02-21 19:28:04 +02001761 .release = kvm_vm_release,
1762 .unlocked_ioctl = kvm_vm_ioctl,
Arnd Bergmann6ff58942009-10-22 14:19:27 +02001763#ifdef CONFIG_COMPAT
1764 .compat_ioctl = kvm_vm_compat_ioctl,
1765#endif
Avi Kivityf17abe92007-02-21 19:28:04 +02001766 .mmap = kvm_vm_mmap,
1767};
1768
1769static int kvm_dev_ioctl_create_vm(void)
1770{
Takuya Yoshikawa6ce5a092010-03-15 22:13:30 +09001771 int fd, r;
Avi Kivityf17abe92007-02-21 19:28:04 +02001772 struct kvm *kvm;
1773
Avi Kivityf17abe92007-02-21 19:28:04 +02001774 kvm = kvm_create_vm();
Avi Kivityd6d28162007-06-28 08:38:16 -04001775 if (IS_ERR(kvm))
1776 return PTR_ERR(kvm);
Takuya Yoshikawa6ce5a092010-03-15 22:13:30 +09001777#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1778 r = kvm_coalesced_mmio_init(kvm);
1779 if (r < 0) {
1780 kvm_put_kvm(kvm);
1781 return r;
1782 }
1783#endif
Roland Dreier628ff7c2009-12-18 09:41:24 -08001784 fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
Al Viro2030a422008-02-23 06:46:49 -05001785 if (fd < 0)
Al Viro66c0b392008-04-19 20:33:56 +01001786 kvm_put_kvm(kvm);
Avi Kivityf17abe92007-02-21 19:28:04 +02001787
Avi Kivityf17abe92007-02-21 19:28:04 +02001788 return fd;
Avi Kivityf17abe92007-02-21 19:28:04 +02001789}
1790
Avi Kivity1a811b62008-12-08 18:25:27 +02001791static long kvm_dev_ioctl_check_extension_generic(long arg)
1792{
1793 switch (arg) {
Avi Kivityca9edae2008-12-08 18:29:29 +02001794 case KVM_CAP_USER_MEMORY:
Avi Kivity1a811b62008-12-08 18:25:27 +02001795 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
Jan Kiszka4cd481f2009-04-13 11:59:32 +02001796 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
Gleb Natapov73880c82009-06-09 15:56:28 +03001797#ifdef CONFIG_KVM_APIC_ARCHITECTURE
1798 case KVM_CAP_SET_BOOT_CPU_ID:
1799#endif
Avi Kivitya9c73992009-11-04 11:54:59 +02001800 case KVM_CAP_INTERNAL_ERROR_DATA:
Avi Kivity1a811b62008-12-08 18:25:27 +02001801 return 1;
Avi Kivity399ec802008-11-19 13:58:46 +02001802#ifdef CONFIG_HAVE_KVM_IRQCHIP
1803 case KVM_CAP_IRQ_ROUTING:
Sheng Yang36463142009-03-16 16:33:43 +08001804 return KVM_MAX_IRQ_ROUTES;
Avi Kivity399ec802008-11-19 13:58:46 +02001805#endif
Avi Kivity1a811b62008-12-08 18:25:27 +02001806 default:
1807 break;
1808 }
1809 return kvm_dev_ioctl_check_extension(arg);
1810}
1811
Avi Kivityf17abe92007-02-21 19:28:04 +02001812static long kvm_dev_ioctl(struct file *filp,
1813 unsigned int ioctl, unsigned long arg)
1814{
Avi Kivity07c45a32007-03-07 13:05:38 +02001815 long r = -EINVAL;
Avi Kivityf17abe92007-02-21 19:28:04 +02001816
1817 switch (ioctl) {
1818 case KVM_GET_API_VERSION:
Avi Kivityf0fe5102007-03-07 13:11:17 +02001819 r = -EINVAL;
1820 if (arg)
1821 goto out;
Avi Kivityf17abe92007-02-21 19:28:04 +02001822 r = KVM_API_VERSION;
1823 break;
1824 case KVM_CREATE_VM:
Avi Kivityf0fe5102007-03-07 13:11:17 +02001825 r = -EINVAL;
1826 if (arg)
1827 goto out;
Avi Kivityf17abe92007-02-21 19:28:04 +02001828 r = kvm_dev_ioctl_create_vm();
1829 break;
Zhang Xiantao018d00d2007-11-15 23:07:47 +08001830 case KVM_CHECK_EXTENSION:
Avi Kivity1a811b62008-12-08 18:25:27 +02001831 r = kvm_dev_ioctl_check_extension_generic(arg);
Avi Kivity5d308f42007-03-01 17:56:20 +02001832 break;
Avi Kivity07c45a32007-03-07 13:05:38 +02001833 case KVM_GET_VCPU_MMAP_SIZE:
1834 r = -EINVAL;
1835 if (arg)
1836 goto out;
Avi Kivityadb1ff42008-01-24 15:13:08 +02001837 r = PAGE_SIZE; /* struct kvm_run */
1838#ifdef CONFIG_X86
1839 r += PAGE_SIZE; /* pio data page */
1840#endif
Laurent Vivier5f94c172008-05-30 16:05:54 +02001841#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1842 r += PAGE_SIZE; /* coalesced mmio ring page */
1843#endif
Avi Kivity07c45a32007-03-07 13:05:38 +02001844 break;
Feng(Eric) Liud4c9ff22008-04-10 08:47:53 -04001845 case KVM_TRACE_ENABLE:
1846 case KVM_TRACE_PAUSE:
1847 case KVM_TRACE_DISABLE:
Marcelo Tosatti2023a292009-06-18 11:47:28 -03001848 r = -EOPNOTSUPP;
Feng(Eric) Liud4c9ff22008-04-10 08:47:53 -04001849 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001850 default:
Carsten Otte043405e2007-10-10 17:16:19 +02001851 return kvm_arch_dev_ioctl(filp, ioctl, arg);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001852 }
1853out:
1854 return r;
1855}
1856
Avi Kivity6aa8b732006-12-10 02:21:36 -08001857static struct file_operations kvm_chardev_ops = {
Avi Kivity6aa8b732006-12-10 02:21:36 -08001858 .unlocked_ioctl = kvm_dev_ioctl,
1859 .compat_ioctl = kvm_dev_ioctl,
Avi Kivity6aa8b732006-12-10 02:21:36 -08001860};
1861
1862static struct miscdevice kvm_dev = {
Avi Kivitybbe44322007-03-04 13:27:36 +02001863 KVM_MINOR,
Avi Kivity6aa8b732006-12-10 02:21:36 -08001864 "kvm",
1865 &kvm_chardev_ops,
1866};
1867
Avi Kivity1b6c0162007-05-24 13:03:52 +03001868static void hardware_enable(void *junk)
1869{
1870 int cpu = raw_smp_processor_id();
Alexander Graf10474ae2009-09-15 11:37:46 +02001871 int r;
Avi Kivity1b6c0162007-05-24 13:03:52 +03001872
Rusty Russell7f59f492008-12-07 21:25:45 +10301873 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
Avi Kivity1b6c0162007-05-24 13:03:52 +03001874 return;
Alexander Graf10474ae2009-09-15 11:37:46 +02001875
Rusty Russell7f59f492008-12-07 21:25:45 +10301876 cpumask_set_cpu(cpu, cpus_hardware_enabled);
Alexander Graf10474ae2009-09-15 11:37:46 +02001877
1878 r = kvm_arch_hardware_enable(NULL);
1879
1880 if (r) {
1881 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
1882 atomic_inc(&hardware_enable_failed);
1883 printk(KERN_INFO "kvm: enabling virtualization on "
1884 "CPU%d failed\n", cpu);
1885 }
Avi Kivity1b6c0162007-05-24 13:03:52 +03001886}
1887
1888static void hardware_disable(void *junk)
1889{
1890 int cpu = raw_smp_processor_id();
1891
Rusty Russell7f59f492008-12-07 21:25:45 +10301892 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
Avi Kivity1b6c0162007-05-24 13:03:52 +03001893 return;
Rusty Russell7f59f492008-12-07 21:25:45 +10301894 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08001895 kvm_arch_hardware_disable(NULL);
Avi Kivity1b6c0162007-05-24 13:03:52 +03001896}
1897
Alexander Graf10474ae2009-09-15 11:37:46 +02001898static void hardware_disable_all_nolock(void)
1899{
1900 BUG_ON(!kvm_usage_count);
1901
1902 kvm_usage_count--;
1903 if (!kvm_usage_count)
1904 on_each_cpu(hardware_disable, NULL, 1);
1905}
1906
1907static void hardware_disable_all(void)
1908{
1909 spin_lock(&kvm_lock);
1910 hardware_disable_all_nolock();
1911 spin_unlock(&kvm_lock);
1912}
1913
1914static int hardware_enable_all(void)
1915{
1916 int r = 0;
1917
1918 spin_lock(&kvm_lock);
1919
1920 kvm_usage_count++;
1921 if (kvm_usage_count == 1) {
1922 atomic_set(&hardware_enable_failed, 0);
1923 on_each_cpu(hardware_enable, NULL, 1);
1924
1925 if (atomic_read(&hardware_enable_failed)) {
1926 hardware_disable_all_nolock();
1927 r = -EBUSY;
1928 }
1929 }
1930
1931 spin_unlock(&kvm_lock);
1932
1933 return r;
1934}
1935
Avi Kivity774c47f2007-02-12 00:54:47 -08001936static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1937 void *v)
1938{
1939 int cpu = (long)v;
1940
Alexander Graf10474ae2009-09-15 11:37:46 +02001941 if (!kvm_usage_count)
1942 return NOTIFY_OK;
1943
Avi Kivity1a6f4d72007-11-11 18:37:32 +02001944 val &= ~CPU_TASKS_FROZEN;
Avi Kivity774c47f2007-02-12 00:54:47 -08001945 switch (val) {
Avi Kivitycec9ad22007-05-24 13:11:41 +03001946 case CPU_DYING:
Avi Kivity6ec8a852007-08-19 15:57:26 +03001947 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1948 cpu);
1949 hardware_disable(NULL);
1950 break;
Jeremy Katz43934a32007-02-19 14:37:46 +02001951 case CPU_ONLINE:
1952 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1953 cpu);
Jens Axboe8691e5a2008-06-06 11:18:06 +02001954 smp_call_function_single(cpu, hardware_enable, NULL, 1);
Avi Kivity774c47f2007-02-12 00:54:47 -08001955 break;
1956 }
1957 return NOTIFY_OK;
1958}
1959
Avi Kivity4ecac3f2008-05-13 13:23:38 +03001960
1961asmlinkage void kvm_handle_fault_on_reboot(void)
1962{
1963 if (kvm_rebooting)
1964 /* spin while reset goes on */
1965 while (true)
1966 ;
1967 /* Fault while not rebooting. We want the trace. */
1968 BUG();
1969}
1970EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
1971
Rusty Russell9a2b85c2007-07-17 23:17:55 +10001972static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
Mike Dayd77c26f2007-10-08 09:02:08 -04001973 void *v)
Rusty Russell9a2b85c2007-07-17 23:17:55 +10001974{
Sheng Yang8e1c1812009-04-29 11:09:04 +08001975 /*
1976 * Some (well, at least mine) BIOSes hang on reboot if
1977 * in vmx root mode.
1978 *
1979 * And Intel TXT required VMX off for all cpu when system shutdown.
1980 */
1981 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1982 kvm_rebooting = true;
1983 on_each_cpu(hardware_disable, NULL, 1);
Rusty Russell9a2b85c2007-07-17 23:17:55 +10001984 return NOTIFY_OK;
1985}
1986
1987static struct notifier_block kvm_reboot_notifier = {
1988 .notifier_call = kvm_reboot,
1989 .priority = 0,
1990};
1991
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02001992static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04001993{
1994 int i;
1995
1996 for (i = 0; i < bus->dev_count; i++) {
1997 struct kvm_io_device *pos = bus->devs[i];
1998
1999 kvm_iodevice_destructor(pos);
2000 }
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002001 kfree(bus);
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002002}
2003
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002004/* kvm_io_bus_write - called under kvm->slots_lock */
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002005int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002006 int len, const void *val)
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002007{
2008 int i;
Lai Jiangshan90d83dc2010-04-19 17:41:23 +08002009 struct kvm_io_bus *bus;
2010
2011 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002012 for (i = 0; i < bus->dev_count; i++)
2013 if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
2014 return 0;
2015 return -EOPNOTSUPP;
2016}
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002017
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002018/* kvm_io_bus_read - called under kvm->slots_lock */
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002019int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2020 int len, void *val)
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002021{
2022 int i;
Lai Jiangshan90d83dc2010-04-19 17:41:23 +08002023 struct kvm_io_bus *bus;
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002024
Lai Jiangshan90d83dc2010-04-19 17:41:23 +08002025 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
Michael S. Tsirkinbda90202009-06-29 22:24:32 +03002026 for (i = 0; i < bus->dev_count; i++)
2027 if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
2028 return 0;
2029 return -EOPNOTSUPP;
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002030}
2031
Marcelo Tosatti79fac952009-12-23 14:35:26 -02002032/* Caller must hold slots_lock. */
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002033int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2034 struct kvm_io_device *dev)
Michael S. Tsirkin6c474692009-06-29 22:24:26 +03002035{
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002036 struct kvm_io_bus *new_bus, *bus;
Gregory Haskins090b7af2009-07-07 17:08:44 -04002037
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002038 bus = kvm->buses[bus_idx];
Gregory Haskins090b7af2009-07-07 17:08:44 -04002039 if (bus->dev_count > NR_IOBUS_DEVS-1)
2040 return -ENOSPC;
2041
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002042 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2043 if (!new_bus)
2044 return -ENOMEM;
2045 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2046 new_bus->devs[new_bus->dev_count++] = dev;
2047 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2048 synchronize_srcu_expedited(&kvm->srcu);
2049 kfree(bus);
Gregory Haskins090b7af2009-07-07 17:08:44 -04002050
2051 return 0;
2052}
2053
Marcelo Tosatti79fac952009-12-23 14:35:26 -02002054/* Caller must hold slots_lock. */
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002055int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2056 struct kvm_io_device *dev)
Gregory Haskins090b7af2009-07-07 17:08:44 -04002057{
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002058 int i, r;
2059 struct kvm_io_bus *new_bus, *bus;
Michael S. Tsirkin6c474692009-06-29 22:24:26 +03002060
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002061 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2062 if (!new_bus)
2063 return -ENOMEM;
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002064
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002065 bus = kvm->buses[bus_idx];
2066 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2067
2068 r = -ENOENT;
2069 for (i = 0; i < new_bus->dev_count; i++)
2070 if (new_bus->devs[i] == dev) {
2071 r = 0;
2072 new_bus->devs[i] = new_bus->devs[--new_bus->dev_count];
Gregory Haskins090b7af2009-07-07 17:08:44 -04002073 break;
2074 }
Marcelo Tosattie93f8a02009-12-23 14:35:24 -02002075
2076 if (r) {
2077 kfree(new_bus);
2078 return r;
2079 }
2080
2081 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2082 synchronize_srcu_expedited(&kvm->srcu);
2083 kfree(bus);
2084 return r;
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04002085}
2086
Avi Kivity774c47f2007-02-12 00:54:47 -08002087static struct notifier_block kvm_cpu_notifier = {
2088 .notifier_call = kvm_cpu_hotplug,
2089 .priority = 20, /* must be > scheduler priority */
2090};
2091
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002092static int vm_stat_get(void *_offset, u64 *val)
Avi Kivityba1389b2007-11-18 16:24:12 +02002093{
2094 unsigned offset = (long)_offset;
Avi Kivityba1389b2007-11-18 16:24:12 +02002095 struct kvm *kvm;
2096
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002097 *val = 0;
Avi Kivityba1389b2007-11-18 16:24:12 +02002098 spin_lock(&kvm_lock);
2099 list_for_each_entry(kvm, &vm_list, vm_list)
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002100 *val += *(u32 *)((void *)kvm + offset);
Avi Kivityba1389b2007-11-18 16:24:12 +02002101 spin_unlock(&kvm_lock);
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002102 return 0;
Avi Kivityba1389b2007-11-18 16:24:12 +02002103}
2104
2105DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2106
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002107static int vcpu_stat_get(void *_offset, u64 *val)
Avi Kivity1165f5f2007-04-19 17:27:43 +03002108{
2109 unsigned offset = (long)_offset;
Avi Kivity1165f5f2007-04-19 17:27:43 +03002110 struct kvm *kvm;
2111 struct kvm_vcpu *vcpu;
2112 int i;
2113
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002114 *val = 0;
Avi Kivity1165f5f2007-04-19 17:27:43 +03002115 spin_lock(&kvm_lock);
2116 list_for_each_entry(kvm, &vm_list, vm_list)
Gleb Natapov988a2ca2009-06-09 15:56:29 +03002117 kvm_for_each_vcpu(i, vcpu, kvm)
2118 *val += *(u32 *)((void *)vcpu + offset);
2119
Avi Kivity1165f5f2007-04-19 17:27:43 +03002120 spin_unlock(&kvm_lock);
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002121 return 0;
Avi Kivity1165f5f2007-04-19 17:27:43 +03002122}
2123
Avi Kivityba1389b2007-11-18 16:24:12 +02002124DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2125
Alexey Dobriyan828c0952009-10-01 15:43:56 -07002126static const struct file_operations *stat_fops[] = {
Avi Kivityba1389b2007-11-18 16:24:12 +02002127 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2128 [KVM_STAT_VM] = &vm_stat_fops,
2129};
Avi Kivity1165f5f2007-04-19 17:27:43 +03002130
Zhang Xiantaoa16b0432007-11-16 14:38:21 +08002131static void kvm_init_debug(void)
Avi Kivity6aa8b732006-12-10 02:21:36 -08002132{
2133 struct kvm_stats_debugfs_item *p;
2134
Hollis Blanchard76f7c872008-04-15 16:05:42 -05002135 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002136 for (p = debugfs_entries; p->name; ++p)
Hollis Blanchard76f7c872008-04-15 16:05:42 -05002137 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
Avi Kivity1165f5f2007-04-19 17:27:43 +03002138 (void *)(long)p->offset,
Avi Kivityba1389b2007-11-18 16:24:12 +02002139 stat_fops[p->kind]);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002140}
2141
2142static void kvm_exit_debug(void)
2143{
2144 struct kvm_stats_debugfs_item *p;
2145
2146 for (p = debugfs_entries; p->name; ++p)
2147 debugfs_remove(p->dentry);
Hollis Blanchard76f7c872008-04-15 16:05:42 -05002148 debugfs_remove(kvm_debugfs_dir);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002149}
2150
Avi Kivity59ae6c62007-02-12 00:54:48 -08002151static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2152{
Alexander Graf10474ae2009-09-15 11:37:46 +02002153 if (kvm_usage_count)
2154 hardware_disable(NULL);
Avi Kivity59ae6c62007-02-12 00:54:48 -08002155 return 0;
2156}
2157
2158static int kvm_resume(struct sys_device *dev)
2159{
Alexander Graf10474ae2009-09-15 11:37:46 +02002160 if (kvm_usage_count)
2161 hardware_enable(NULL);
Avi Kivity59ae6c62007-02-12 00:54:48 -08002162 return 0;
2163}
2164
2165static struct sysdev_class kvm_sysdev_class = {
Kay Sieversaf5ca3f2007-12-20 02:09:39 +01002166 .name = "kvm",
Avi Kivity59ae6c62007-02-12 00:54:48 -08002167 .suspend = kvm_suspend,
2168 .resume = kvm_resume,
2169};
2170
2171static struct sys_device kvm_sysdev = {
2172 .id = 0,
2173 .cls = &kvm_sysdev_class,
2174};
2175
Izik Eiduscea7bb22007-10-17 19:17:48 +02002176struct page *bad_page;
Anthony Liguori35149e22008-04-02 14:46:56 -05002177pfn_t bad_pfn;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002178
Avi Kivity15ad7142007-07-11 18:17:21 +03002179static inline
2180struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2181{
2182 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2183}
2184
2185static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2186{
2187 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2188
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002189 kvm_arch_vcpu_load(vcpu, cpu);
Avi Kivity15ad7142007-07-11 18:17:21 +03002190}
2191
2192static void kvm_sched_out(struct preempt_notifier *pn,
2193 struct task_struct *next)
2194{
2195 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2196
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002197 kvm_arch_vcpu_put(vcpu);
Avi Kivity15ad7142007-07-11 18:17:21 +03002198}
2199
Avi Kivity0ee75be2010-04-28 15:39:01 +03002200int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
Rusty Russellc16f8622007-07-30 21:12:19 +10002201 struct module *module)
Avi Kivity6aa8b732006-12-10 02:21:36 -08002202{
2203 int r;
Yang, Sheng002c7f72007-07-31 14:23:01 +03002204 int cpu;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002205
Zhang Xiantaof8c16bb2007-11-14 20:40:21 +08002206 r = kvm_arch_init(opaque);
2207 if (r)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002208 goto out_fail;
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002209
2210 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2211
2212 if (bad_page == NULL) {
2213 r = -ENOMEM;
2214 goto out;
2215 }
2216
Anthony Liguori35149e22008-04-02 14:46:56 -05002217 bad_pfn = page_to_pfn(bad_page);
2218
Huang Yingbf998152010-05-31 14:28:19 +08002219 hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2220
2221 if (hwpoison_page == NULL) {
2222 r = -ENOMEM;
2223 goto out_free_0;
2224 }
2225
2226 hwpoison_pfn = page_to_pfn(hwpoison_page);
2227
Avi Kivity8437a612009-06-06 14:52:35 -07002228 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
Rusty Russell7f59f492008-12-07 21:25:45 +10302229 r = -ENOMEM;
2230 goto out_free_0;
2231 }
2232
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002233 r = kvm_arch_hardware_setup();
Avi Kivity6aa8b732006-12-10 02:21:36 -08002234 if (r < 0)
Rusty Russell7f59f492008-12-07 21:25:45 +10302235 goto out_free_0a;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002236
Yang, Sheng002c7f72007-07-31 14:23:01 +03002237 for_each_online_cpu(cpu) {
2238 smp_call_function_single(cpu,
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002239 kvm_arch_check_processor_compat,
Jens Axboe8691e5a2008-06-06 11:18:06 +02002240 &r, 1);
Yang, Sheng002c7f72007-07-31 14:23:01 +03002241 if (r < 0)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002242 goto out_free_1;
Yang, Sheng002c7f72007-07-31 14:23:01 +03002243 }
2244
Avi Kivity774c47f2007-02-12 00:54:47 -08002245 r = register_cpu_notifier(&kvm_cpu_notifier);
2246 if (r)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002247 goto out_free_2;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002248 register_reboot_notifier(&kvm_reboot_notifier);
2249
Avi Kivity59ae6c62007-02-12 00:54:48 -08002250 r = sysdev_class_register(&kvm_sysdev_class);
2251 if (r)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002252 goto out_free_3;
Avi Kivity59ae6c62007-02-12 00:54:48 -08002253
2254 r = sysdev_register(&kvm_sysdev);
2255 if (r)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002256 goto out_free_4;
Avi Kivity59ae6c62007-02-12 00:54:48 -08002257
Rusty Russellc16f8622007-07-30 21:12:19 +10002258 /* A kmem cache lets us meet the alignment requirements of fx_save. */
Avi Kivity0ee75be2010-04-28 15:39:01 +03002259 if (!vcpu_align)
2260 vcpu_align = __alignof__(struct kvm_vcpu);
2261 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
Joe Perches56919c52007-11-12 20:06:51 -08002262 0, NULL);
Rusty Russellc16f8622007-07-30 21:12:19 +10002263 if (!kvm_vcpu_cache) {
2264 r = -ENOMEM;
Zhang Xiantaod23087842007-11-29 15:35:39 +08002265 goto out_free_5;
Rusty Russellc16f8622007-07-30 21:12:19 +10002266 }
2267
Avi Kivity6aa8b732006-12-10 02:21:36 -08002268 kvm_chardev_ops.owner = module;
Christian Borntraeger3d3aab12008-12-02 11:17:32 +01002269 kvm_vm_fops.owner = module;
2270 kvm_vcpu_fops.owner = module;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002271
2272 r = misc_register(&kvm_dev);
2273 if (r) {
Mike Dayd77c26f2007-10-08 09:02:08 -04002274 printk(KERN_ERR "kvm: misc device register failed\n");
Avi Kivity6aa8b732006-12-10 02:21:36 -08002275 goto out_free;
2276 }
2277
Avi Kivity15ad7142007-07-11 18:17:21 +03002278 kvm_preempt_ops.sched_in = kvm_sched_in;
2279 kvm_preempt_ops.sched_out = kvm_sched_out;
2280
Darrick J. Wong0ea4ed82009-10-14 16:21:00 -07002281 kvm_init_debug();
2282
Avi Kivityc7addb92007-09-16 18:58:32 +02002283 return 0;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002284
2285out_free:
Rusty Russellc16f8622007-07-30 21:12:19 +10002286 kmem_cache_destroy(kvm_vcpu_cache);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002287out_free_5:
Avi Kivity59ae6c62007-02-12 00:54:48 -08002288 sysdev_unregister(&kvm_sysdev);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002289out_free_4:
Avi Kivity59ae6c62007-02-12 00:54:48 -08002290 sysdev_class_unregister(&kvm_sysdev_class);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002291out_free_3:
Avi Kivity6aa8b732006-12-10 02:21:36 -08002292 unregister_reboot_notifier(&kvm_reboot_notifier);
Avi Kivity774c47f2007-02-12 00:54:47 -08002293 unregister_cpu_notifier(&kvm_cpu_notifier);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002294out_free_2:
Zhang Xiantaod23087842007-11-29 15:35:39 +08002295out_free_1:
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002296 kvm_arch_hardware_unsetup();
Rusty Russell7f59f492008-12-07 21:25:45 +10302297out_free_0a:
2298 free_cpumask_var(cpus_hardware_enabled);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002299out_free_0:
Huang Yingbf998152010-05-31 14:28:19 +08002300 if (hwpoison_page)
2301 __free_page(hwpoison_page);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002302 __free_page(bad_page);
Avi Kivityca45aaa2007-03-01 19:21:03 +02002303out:
Zhang Xiantaof8c16bb2007-11-14 20:40:21 +08002304 kvm_arch_exit();
Zhang Xiantaod23087842007-11-29 15:35:39 +08002305out_fail:
Avi Kivity6aa8b732006-12-10 02:21:36 -08002306 return r;
2307}
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002308EXPORT_SYMBOL_GPL(kvm_init);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002309
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002310void kvm_exit(void)
Avi Kivity6aa8b732006-12-10 02:21:36 -08002311{
Darrick J. Wong0ea4ed82009-10-14 16:21:00 -07002312 kvm_exit_debug();
Avi Kivity6aa8b732006-12-10 02:21:36 -08002313 misc_deregister(&kvm_dev);
Rusty Russellc16f8622007-07-30 21:12:19 +10002314 kmem_cache_destroy(kvm_vcpu_cache);
Avi Kivity59ae6c62007-02-12 00:54:48 -08002315 sysdev_unregister(&kvm_sysdev);
2316 sysdev_class_unregister(&kvm_sysdev_class);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002317 unregister_reboot_notifier(&kvm_reboot_notifier);
Avi Kivity59ae6c62007-02-12 00:54:48 -08002318 unregister_cpu_notifier(&kvm_cpu_notifier);
Jens Axboe15c8b6c2008-05-09 09:39:44 +02002319 on_each_cpu(hardware_disable, NULL, 1);
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002320 kvm_arch_hardware_unsetup();
Zhang Xiantaof8c16bb2007-11-14 20:40:21 +08002321 kvm_arch_exit();
Rusty Russell7f59f492008-12-07 21:25:45 +10302322 free_cpumask_var(cpus_hardware_enabled);
Huang Yingbf998152010-05-31 14:28:19 +08002323 __free_page(hwpoison_page);
Izik Eiduscea7bb22007-10-17 19:17:48 +02002324 __free_page(bad_page);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002325}
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002326EXPORT_SYMBOL_GPL(kvm_exit);