blob: 638de47e167de6135dec51f0cded47c116b90930 [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.
8 *
9 * Authors:
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
12 *
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
15 *
16 */
17
Hollis Blancharde2174022007-12-03 15:30:24 -060018#include "iodev.h"
Avi Kivity6aa8b732006-12-10 02:21:36 -080019
Avi Kivityedf88412007-12-16 11:02:48 +020020#include <linux/kvm_host.h>
Avi Kivity6aa8b732006-12-10 02:21:36 -080021#include <linux/kvm.h>
22#include <linux/module.h>
23#include <linux/errno.h>
Avi Kivity6aa8b732006-12-10 02:21:36 -080024#include <linux/percpu.h>
25#include <linux/gfp.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>
Avi Kivity6aa8b732006-12-10 02:21:36 -080044
Avi Kivitye4956062007-06-28 14:15:57 -040045#include <asm/processor.h>
Avi Kivitye4956062007-06-28 14:15:57 -040046#include <asm/io.h>
47#include <asm/uaccess.h>
Izik Eidus3e021bf2007-11-19 11:16:57 +020048#include <asm/pgtable.h>
Avi Kivity6aa8b732006-12-10 02:21:36 -080049
Laurent Vivier5f94c172008-05-30 16:05:54 +020050#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
51#include "coalesced_mmio.h"
52#endif
53
Xiantao Zhang8a98f662008-10-06 13:47:38 +080054#ifdef KVM_CAP_DEVICE_ASSIGNMENT
55#include <linux/pci.h>
56#include <linux/interrupt.h>
57#include "irq.h"
58#endif
59
Avi Kivity6aa8b732006-12-10 02:21:36 -080060MODULE_AUTHOR("Qumranet");
61MODULE_LICENSE("GPL");
62
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +080063DEFINE_SPINLOCK(kvm_lock);
64LIST_HEAD(vm_list);
Avi Kivity133de902007-02-12 00:54:44 -080065
Avi Kivity1b6c0162007-05-24 13:03:52 +030066static cpumask_t cpus_hardware_enabled;
67
Rusty Russellc16f8622007-07-30 21:12:19 +100068struct kmem_cache *kvm_vcpu_cache;
69EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
Avi Kivity1165f5f2007-04-19 17:27:43 +030070
Avi Kivity15ad7142007-07-11 18:17:21 +030071static __read_mostly struct preempt_ops kvm_preempt_ops;
72
Hollis Blanchard76f7c872008-04-15 16:05:42 -050073struct dentry *kvm_debugfs_dir;
Avi Kivity6aa8b732006-12-10 02:21:36 -080074
Avi Kivitybccf2152007-02-21 18:04:26 +020075static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
76 unsigned long arg);
77
Avi Kivity4ecac3f2008-05-13 13:23:38 +030078bool kvm_rebooting;
79
Xiantao Zhang8a98f662008-10-06 13:47:38 +080080#ifdef KVM_CAP_DEVICE_ASSIGNMENT
81static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
82 int assigned_dev_id)
83{
84 struct list_head *ptr;
85 struct kvm_assigned_dev_kernel *match;
86
87 list_for_each(ptr, head) {
88 match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
89 if (match->assigned_dev_id == assigned_dev_id)
90 return match;
91 }
92 return NULL;
93}
94
95static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
96{
97 struct kvm_assigned_dev_kernel *assigned_dev;
98
99 assigned_dev = container_of(work, struct kvm_assigned_dev_kernel,
100 interrupt_work);
101
102 /* This is taken to safely inject irq inside the guest. When
103 * the interrupt injection (or the ioapic code) uses a
104 * finer-grained lock, update this
105 */
106 mutex_lock(&assigned_dev->kvm->lock);
107 kvm_set_irq(assigned_dev->kvm,
Sheng Yang5550af42008-10-15 20:15:06 +0800108 assigned_dev->irq_source_id,
Xiantao Zhang8a98f662008-10-06 13:47:38 +0800109 assigned_dev->guest_irq, 1);
110 mutex_unlock(&assigned_dev->kvm->lock);
111 kvm_put_kvm(assigned_dev->kvm);
112}
113
Xiantao Zhang8a98f662008-10-06 13:47:38 +0800114static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
115{
116 struct kvm_assigned_dev_kernel *assigned_dev =
117 (struct kvm_assigned_dev_kernel *) dev_id;
118
119 kvm_get_kvm(assigned_dev->kvm);
120 schedule_work(&assigned_dev->interrupt_work);
121 disable_irq_nosync(irq);
122 return IRQ_HANDLED;
123}
124
125/* Ack the irq line for an assigned device */
126static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
127{
128 struct kvm_assigned_dev_kernel *dev;
129
130 if (kian->gsi == -1)
131 return;
132
133 dev = container_of(kian, struct kvm_assigned_dev_kernel,
134 ack_notifier);
Sheng Yang5550af42008-10-15 20:15:06 +0800135 kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
Xiantao Zhang8a98f662008-10-06 13:47:38 +0800136 enable_irq(dev->host_irq);
137}
138
139static void kvm_free_assigned_device(struct kvm *kvm,
140 struct kvm_assigned_dev_kernel
141 *assigned_dev)
142{
Sheng Yang4f906c12008-11-24 14:32:51 +0800143 if (irqchip_in_kernel(kvm) && assigned_dev->irq_requested_type)
Xiantao Zhang8a98f662008-10-06 13:47:38 +0800144 free_irq(assigned_dev->host_irq, (void *)assigned_dev);
145
Sheng Yange19e30e2008-10-20 16:07:10 +0800146 kvm_unregister_irq_ack_notifier(&assigned_dev->ack_notifier);
Sheng Yang5550af42008-10-15 20:15:06 +0800147 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
Xiantao Zhang8a98f662008-10-06 13:47:38 +0800148
149 if (cancel_work_sync(&assigned_dev->interrupt_work))
150 /* We had pending work. That means we will have to take
151 * care of kvm_put_kvm.
152 */
153 kvm_put_kvm(kvm);
154
Sheng Yang6eb55812008-10-31 12:37:41 +0800155 pci_reset_function(assigned_dev->dev);
156
Xiantao Zhang8a98f662008-10-06 13:47:38 +0800157 pci_release_regions(assigned_dev->dev);
158 pci_disable_device(assigned_dev->dev);
159 pci_dev_put(assigned_dev->dev);
160
161 list_del(&assigned_dev->list);
162 kfree(assigned_dev);
163}
164
165void kvm_free_all_assigned_devices(struct kvm *kvm)
166{
167 struct list_head *ptr, *ptr2;
168 struct kvm_assigned_dev_kernel *assigned_dev;
169
170 list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
171 assigned_dev = list_entry(ptr,
172 struct kvm_assigned_dev_kernel,
173 list);
174
175 kvm_free_assigned_device(kvm, assigned_dev);
176 }
177}
178
Sheng Yang00e3ed32008-11-24 14:32:50 +0800179static int assigned_device_update_intx(struct kvm *kvm,
180 struct kvm_assigned_dev_kernel *adev,
181 struct kvm_assigned_irq *airq)
182{
Sheng Yang4f906c12008-11-24 14:32:51 +0800183 if (adev->irq_requested_type & KVM_ASSIGNED_DEV_GUEST_INTX) {
Sheng Yang00e3ed32008-11-24 14:32:50 +0800184 adev->guest_irq = airq->guest_irq;
185 adev->ack_notifier.gsi = airq->guest_irq;
186 return 0;
187 }
188
189 if (irqchip_in_kernel(kvm)) {
190 if (!capable(CAP_SYS_RAWIO))
191 return -EPERM;
192
193 if (airq->host_irq)
194 adev->host_irq = airq->host_irq;
195 else
196 adev->host_irq = adev->dev->irq;
197 adev->guest_irq = airq->guest_irq;
198 adev->ack_notifier.gsi = airq->guest_irq;
199
200 /* Even though this is PCI, we don't want to use shared
201 * interrupts. Sharing host devices with guest-assigned devices
202 * on the same interrupt line is not a happy situation: there
203 * are going to be long delays in accepting, acking, etc.
204 */
205 if (request_irq(adev->host_irq, kvm_assigned_dev_intr,
206 0, "kvm_assigned_intx_device", (void *)adev))
207 return -EIO;
208 }
209
Sheng Yang4f906c12008-11-24 14:32:51 +0800210 adev->irq_requested_type = KVM_ASSIGNED_DEV_GUEST_INTX |
211 KVM_ASSIGNED_DEV_HOST_INTX;
Sheng Yang00e3ed32008-11-24 14:32:50 +0800212 return 0;
213}
214
Xiantao Zhang8a98f662008-10-06 13:47:38 +0800215static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
216 struct kvm_assigned_irq
217 *assigned_irq)
218{
219 int r = 0;
220 struct kvm_assigned_dev_kernel *match;
221
222 mutex_lock(&kvm->lock);
223
224 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
225 assigned_irq->assigned_dev_id);
226 if (!match) {
227 mutex_unlock(&kvm->lock);
228 return -EINVAL;
229 }
230
Sheng Yang4f906c12008-11-24 14:32:51 +0800231 if (!match->irq_requested_type) {
Sheng Yang342ffb92008-11-24 14:32:49 +0800232 INIT_WORK(&match->interrupt_work,
233 kvm_assigned_dev_interrupt_work_handler);
234 if (irqchip_in_kernel(kvm)) {
235 /* Register ack nofitier */
236 match->ack_notifier.gsi = -1;
237 match->ack_notifier.irq_acked =
238 kvm_assigned_dev_ack_irq;
239 kvm_register_irq_ack_notifier(kvm,
240 &match->ack_notifier);
241
242 /* Request IRQ source ID */
243 r = kvm_request_irq_source_id(kvm);
244 if (r < 0)
245 goto out_release;
246 else
247 match->irq_source_id = r;
248 }
Xiantao Zhang8a98f662008-10-06 13:47:38 +0800249 }
250
Sheng Yang00e3ed32008-11-24 14:32:50 +0800251 r = assigned_device_update_intx(kvm, match, assigned_irq);
252 if (r)
253 goto out_release;
Xiantao Zhang8a98f662008-10-06 13:47:38 +0800254
Xiantao Zhang8a98f662008-10-06 13:47:38 +0800255 mutex_unlock(&kvm->lock);
256 return r;
257out_release:
258 mutex_unlock(&kvm->lock);
259 kvm_free_assigned_device(kvm, match);
260 return r;
261}
262
263static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
264 struct kvm_assigned_pci_dev *assigned_dev)
265{
266 int r = 0;
267 struct kvm_assigned_dev_kernel *match;
268 struct pci_dev *dev;
269
270 mutex_lock(&kvm->lock);
271
272 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
273 assigned_dev->assigned_dev_id);
274 if (match) {
275 /* device already assigned */
276 r = -EINVAL;
277 goto out;
278 }
279
280 match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
281 if (match == NULL) {
282 printk(KERN_INFO "%s: Couldn't allocate memory\n",
283 __func__);
284 r = -ENOMEM;
285 goto out;
286 }
287 dev = pci_get_bus_and_slot(assigned_dev->busnr,
288 assigned_dev->devfn);
289 if (!dev) {
290 printk(KERN_INFO "%s: host device not found\n", __func__);
291 r = -EINVAL;
292 goto out_free;
293 }
294 if (pci_enable_device(dev)) {
295 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
296 r = -EBUSY;
297 goto out_put;
298 }
299 r = pci_request_regions(dev, "kvm_assigned_device");
300 if (r) {
301 printk(KERN_INFO "%s: Could not get access to device regions\n",
302 __func__);
303 goto out_disable;
304 }
Sheng Yang6eb55812008-10-31 12:37:41 +0800305
306 pci_reset_function(dev);
307
Xiantao Zhang8a98f662008-10-06 13:47:38 +0800308 match->assigned_dev_id = assigned_dev->assigned_dev_id;
309 match->host_busnr = assigned_dev->busnr;
310 match->host_devfn = assigned_dev->devfn;
311 match->dev = dev;
312
313 match->kvm = kvm;
314
315 list_add(&match->list, &kvm->arch.assigned_dev_head);
316
317 if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
318 r = kvm_iommu_map_guest(kvm, match);
319 if (r)
320 goto out_list_del;
321 }
322
323out:
324 mutex_unlock(&kvm->lock);
325 return r;
326out_list_del:
327 list_del(&match->list);
328 pci_release_regions(dev);
329out_disable:
330 pci_disable_device(dev);
331out_put:
332 pci_dev_put(dev);
333out_free:
334 kfree(match);
335 mutex_unlock(&kvm->lock);
336 return r;
337}
338#endif
339
James Morris5aacf0c2006-12-22 01:04:55 -0800340static inline int valid_vcpu(int n)
341{
342 return likely(n >= 0 && n < KVM_MAX_VCPUS);
343}
344
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +0800345inline int kvm_is_mmio_pfn(pfn_t pfn)
Ben-Ami Yassourcbff90a2008-07-28 19:26:24 +0300346{
347 if (pfn_valid(pfn))
348 return PageReserved(pfn_to_page(pfn));
349
350 return true;
351}
352
Avi Kivity6aa8b732006-12-10 02:21:36 -0800353/*
354 * Switches to specified vcpu, until a matching vcpu_put()
355 */
Carsten Otte313a3dc2007-10-11 19:16:52 +0200356void vcpu_load(struct kvm_vcpu *vcpu)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800357{
Avi Kivity15ad7142007-07-11 18:17:21 +0300358 int cpu;
359
Avi Kivitybccf2152007-02-21 18:04:26 +0200360 mutex_lock(&vcpu->mutex);
Avi Kivity15ad7142007-07-11 18:17:21 +0300361 cpu = get_cpu();
362 preempt_notifier_register(&vcpu->preempt_notifier);
Carsten Otte313a3dc2007-10-11 19:16:52 +0200363 kvm_arch_vcpu_load(vcpu, cpu);
Avi Kivity15ad7142007-07-11 18:17:21 +0300364 put_cpu();
Avi Kivitybccf2152007-02-21 18:04:26 +0200365}
366
Carsten Otte313a3dc2007-10-11 19:16:52 +0200367void vcpu_put(struct kvm_vcpu *vcpu)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800368{
Avi Kivity15ad7142007-07-11 18:17:21 +0300369 preempt_disable();
Carsten Otte313a3dc2007-10-11 19:16:52 +0200370 kvm_arch_vcpu_put(vcpu);
Avi Kivity15ad7142007-07-11 18:17:21 +0300371 preempt_notifier_unregister(&vcpu->preempt_notifier);
372 preempt_enable();
Avi Kivity6aa8b732006-12-10 02:21:36 -0800373 mutex_unlock(&vcpu->mutex);
374}
375
Avi Kivityd9e368d2007-06-07 19:18:30 +0300376static void ack_flush(void *_completed)
377{
Avi Kivityd9e368d2007-06-07 19:18:30 +0300378}
379
380void kvm_flush_remote_tlbs(struct kvm *kvm)
381{
Avi Kivity597a5f52008-07-20 14:24:22 +0300382 int i, cpu, me;
Avi Kivityd9e368d2007-06-07 19:18:30 +0300383 cpumask_t cpus;
384 struct kvm_vcpu *vcpu;
Avi Kivityd9e368d2007-06-07 19:18:30 +0300385
Avi Kivity597a5f52008-07-20 14:24:22 +0300386 me = get_cpu();
Avi Kivityd9e368d2007-06-07 19:18:30 +0300387 cpus_clear(cpus);
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000388 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
389 vcpu = kvm->vcpus[i];
390 if (!vcpu)
391 continue;
Avi Kivity3176bc32007-10-16 17:22:08 +0200392 if (test_and_set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
Avi Kivityd9e368d2007-06-07 19:18:30 +0300393 continue;
394 cpu = vcpu->cpu;
Avi Kivity597a5f52008-07-20 14:24:22 +0300395 if (cpu != -1 && cpu != me)
Laurent Vivier49d3bd72007-10-22 16:33:07 +0200396 cpu_set(cpu, cpus);
Avi Kivityd9e368d2007-06-07 19:18:30 +0300397 }
Avi Kivity0f74a242007-11-20 23:01:14 +0200398 if (cpus_empty(cpus))
Avi Kivity597a5f52008-07-20 14:24:22 +0300399 goto out;
Avi Kivity0f74a242007-11-20 23:01:14 +0200400 ++kvm->stat.remote_tlb_flush;
Laurent Vivier49d3bd72007-10-22 16:33:07 +0200401 smp_call_function_mask(cpus, ack_flush, NULL, 1);
Avi Kivity597a5f52008-07-20 14:24:22 +0300402out:
403 put_cpu();
Avi Kivityd9e368d2007-06-07 19:18:30 +0300404}
405
Marcelo Tosatti2e53d632008-02-20 14:47:24 -0500406void kvm_reload_remote_mmus(struct kvm *kvm)
407{
Avi Kivity597a5f52008-07-20 14:24:22 +0300408 int i, cpu, me;
Marcelo Tosatti2e53d632008-02-20 14:47:24 -0500409 cpumask_t cpus;
410 struct kvm_vcpu *vcpu;
411
Avi Kivity597a5f52008-07-20 14:24:22 +0300412 me = get_cpu();
Marcelo Tosatti2e53d632008-02-20 14:47:24 -0500413 cpus_clear(cpus);
414 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
415 vcpu = kvm->vcpus[i];
416 if (!vcpu)
417 continue;
418 if (test_and_set_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
419 continue;
420 cpu = vcpu->cpu;
Avi Kivity597a5f52008-07-20 14:24:22 +0300421 if (cpu != -1 && cpu != me)
Marcelo Tosatti2e53d632008-02-20 14:47:24 -0500422 cpu_set(cpu, cpus);
423 }
424 if (cpus_empty(cpus))
Avi Kivity597a5f52008-07-20 14:24:22 +0300425 goto out;
Marcelo Tosatti2e53d632008-02-20 14:47:24 -0500426 smp_call_function_mask(cpus, ack_flush, NULL, 1);
Avi Kivity597a5f52008-07-20 14:24:22 +0300427out:
428 put_cpu();
Marcelo Tosatti2e53d632008-02-20 14:47:24 -0500429}
430
431
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000432int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
433{
434 struct page *page;
435 int r;
436
437 mutex_init(&vcpu->mutex);
438 vcpu->cpu = -1;
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000439 vcpu->kvm = kvm;
440 vcpu->vcpu_id = id;
Eddie Dongb6958ce2007-07-18 12:15:21 +0300441 init_waitqueue_head(&vcpu->wq);
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000442
443 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
444 if (!page) {
445 r = -ENOMEM;
446 goto fail;
447 }
448 vcpu->run = page_address(page);
449
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +0800450 r = kvm_arch_vcpu_init(vcpu);
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000451 if (r < 0)
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +0800452 goto fail_free_run;
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000453 return 0;
454
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000455fail_free_run:
456 free_page((unsigned long)vcpu->run);
457fail:
Rusty Russell76fafa52007-10-08 10:50:48 +1000458 return r;
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000459}
460EXPORT_SYMBOL_GPL(kvm_vcpu_init);
461
462void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
463{
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +0800464 kvm_arch_vcpu_uninit(vcpu);
Rusty Russellfb3f0f52007-07-27 17:16:56 +1000465 free_page((unsigned long)vcpu->run);
466}
467EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
468
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200469#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
470static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
471{
472 return container_of(mn, struct kvm, mmu_notifier);
473}
474
475static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
476 struct mm_struct *mm,
477 unsigned long address)
478{
479 struct kvm *kvm = mmu_notifier_to_kvm(mn);
480 int need_tlb_flush;
481
482 /*
483 * When ->invalidate_page runs, the linux pte has been zapped
484 * already but the page is still allocated until
485 * ->invalidate_page returns. So if we increase the sequence
486 * here the kvm page fault will notice if the spte can't be
487 * established because the page is going to be freed. If
488 * instead the kvm page fault establishes the spte before
489 * ->invalidate_page runs, kvm_unmap_hva will release it
490 * before returning.
491 *
492 * The sequence increase only need to be seen at spin_unlock
493 * time, and not at spin_lock time.
494 *
495 * Increasing the sequence after the spin_unlock would be
496 * unsafe because the kvm page fault could then establish the
497 * pte after kvm_unmap_hva returned, without noticing the page
498 * is going to be freed.
499 */
500 spin_lock(&kvm->mmu_lock);
501 kvm->mmu_notifier_seq++;
502 need_tlb_flush = kvm_unmap_hva(kvm, address);
503 spin_unlock(&kvm->mmu_lock);
504
505 /* we've to flush the tlb before the pages can be freed */
506 if (need_tlb_flush)
507 kvm_flush_remote_tlbs(kvm);
508
509}
510
511static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
512 struct mm_struct *mm,
513 unsigned long start,
514 unsigned long end)
515{
516 struct kvm *kvm = mmu_notifier_to_kvm(mn);
517 int need_tlb_flush = 0;
518
519 spin_lock(&kvm->mmu_lock);
520 /*
521 * The count increase must become visible at unlock time as no
522 * spte can be established without taking the mmu_lock and
523 * count is also read inside the mmu_lock critical section.
524 */
525 kvm->mmu_notifier_count++;
526 for (; start < end; start += PAGE_SIZE)
527 need_tlb_flush |= kvm_unmap_hva(kvm, start);
528 spin_unlock(&kvm->mmu_lock);
529
530 /* we've to flush the tlb before the pages can be freed */
531 if (need_tlb_flush)
532 kvm_flush_remote_tlbs(kvm);
533}
534
535static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
536 struct mm_struct *mm,
537 unsigned long start,
538 unsigned long end)
539{
540 struct kvm *kvm = mmu_notifier_to_kvm(mn);
541
542 spin_lock(&kvm->mmu_lock);
543 /*
544 * This sequence increase will notify the kvm page fault that
545 * the page that is going to be mapped in the spte could have
546 * been freed.
547 */
548 kvm->mmu_notifier_seq++;
549 /*
550 * The above sequence increase must be visible before the
551 * below count decrease but both values are read by the kvm
552 * page fault under mmu_lock spinlock so we don't need to add
553 * a smb_wmb() here in between the two.
554 */
555 kvm->mmu_notifier_count--;
556 spin_unlock(&kvm->mmu_lock);
557
558 BUG_ON(kvm->mmu_notifier_count < 0);
559}
560
561static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
562 struct mm_struct *mm,
563 unsigned long address)
564{
565 struct kvm *kvm = mmu_notifier_to_kvm(mn);
566 int young;
567
568 spin_lock(&kvm->mmu_lock);
569 young = kvm_age_hva(kvm, address);
570 spin_unlock(&kvm->mmu_lock);
571
572 if (young)
573 kvm_flush_remote_tlbs(kvm);
574
575 return young;
576}
577
578static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
579 .invalidate_page = kvm_mmu_notifier_invalidate_page,
580 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
581 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
582 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
583};
584#endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
585
Avi Kivityf17abe92007-02-21 19:28:04 +0200586static struct kvm *kvm_create_vm(void)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800587{
Zhang Xiantaod19a9cd2007-11-18 18:43:45 +0800588 struct kvm *kvm = kvm_arch_create_vm();
Laurent Vivier5f94c172008-05-30 16:05:54 +0200589#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
590 struct page *page;
591#endif
Avi Kivity6aa8b732006-12-10 02:21:36 -0800592
Zhang Xiantaod19a9cd2007-11-18 18:43:45 +0800593 if (IS_ERR(kvm))
594 goto out;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800595
Laurent Vivier5f94c172008-05-30 16:05:54 +0200596#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
597 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
598 if (!page) {
599 kfree(kvm);
600 return ERR_PTR(-ENOMEM);
601 }
602 kvm->coalesced_mmio_ring =
603 (struct kvm_coalesced_mmio_ring *)page_address(page);
604#endif
605
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200606#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
607 {
608 int err;
609 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
610 err = mmu_notifier_register(&kvm->mmu_notifier, current->mm);
611 if (err) {
612#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
613 put_page(page);
614#endif
615 kfree(kvm);
616 return ERR_PTR(err);
617 }
618 }
619#endif
620
Avi Kivity6d4e4c42007-11-21 16:41:05 +0200621 kvm->mm = current->mm;
622 atomic_inc(&kvm->mm->mm_count);
Marcelo Tosattiaaee2c92007-12-20 19:18:26 -0500623 spin_lock_init(&kvm->mmu_lock);
Eddie Dong74906342007-06-19 18:05:03 +0300624 kvm_io_bus_init(&kvm->pio_bus);
Shaohua Li11ec2802007-07-23 14:51:37 +0800625 mutex_init(&kvm->lock);
Gregory Haskins2eeb2e92007-05-31 14:08:53 -0400626 kvm_io_bus_init(&kvm->mmio_bus);
Izik Eidus72dc67a2008-02-10 18:04:15 +0200627 init_rwsem(&kvm->slots_lock);
Izik Eidusd39f13b2008-03-30 16:01:25 +0300628 atomic_set(&kvm->users_count, 1);
Rusty Russell5e58cfe2007-07-23 17:08:21 +1000629 spin_lock(&kvm_lock);
630 list_add(&kvm->vm_list, &vm_list);
631 spin_unlock(&kvm_lock);
Laurent Vivier5f94c172008-05-30 16:05:54 +0200632#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
633 kvm_coalesced_mmio_init(kvm);
634#endif
Zhang Xiantaod19a9cd2007-11-18 18:43:45 +0800635out:
Avi Kivityf17abe92007-02-21 19:28:04 +0200636 return kvm;
637}
638
Avi Kivity6aa8b732006-12-10 02:21:36 -0800639/*
640 * Free any memory in @free but not in @dont.
641 */
642static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
643 struct kvm_memory_slot *dont)
644{
Izik Eidus290fc382007-09-27 14:11:22 +0200645 if (!dont || free->rmap != dont->rmap)
646 vfree(free->rmap);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800647
648 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
649 vfree(free->dirty_bitmap);
650
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300651 if (!dont || free->lpage_info != dont->lpage_info)
652 vfree(free->lpage_info);
653
Avi Kivity6aa8b732006-12-10 02:21:36 -0800654 free->npages = 0;
Al Viro8b6d44c2007-02-09 16:38:40 +0000655 free->dirty_bitmap = NULL;
Anthony Liguori8d4e1282007-10-18 09:59:34 -0500656 free->rmap = NULL;
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300657 free->lpage_info = NULL;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800658}
659
Zhang Xiantaod19a9cd2007-11-18 18:43:45 +0800660void kvm_free_physmem(struct kvm *kvm)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800661{
662 int i;
663
664 for (i = 0; i < kvm->nmemslots; ++i)
Al Viro8b6d44c2007-02-09 16:38:40 +0000665 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800666}
667
Avi Kivityf17abe92007-02-21 19:28:04 +0200668static void kvm_destroy_vm(struct kvm *kvm)
669{
Avi Kivity6d4e4c42007-11-21 16:41:05 +0200670 struct mm_struct *mm = kvm->mm;
671
Avi Kivity133de902007-02-12 00:54:44 -0800672 spin_lock(&kvm_lock);
673 list_del(&kvm->vm_list);
674 spin_unlock(&kvm_lock);
Eddie Dong74906342007-06-19 18:05:03 +0300675 kvm_io_bus_destroy(&kvm->pio_bus);
Gregory Haskins2eeb2e92007-05-31 14:08:53 -0400676 kvm_io_bus_destroy(&kvm->mmio_bus);
Laurent Vivier5f94c172008-05-30 16:05:54 +0200677#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
678 if (kvm->coalesced_mmio_ring != NULL)
679 free_page((unsigned long)kvm->coalesced_mmio_ring);
680#endif
Andrea Arcangelie930bff2008-07-25 16:24:52 +0200681#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
682 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
683#endif
Zhang Xiantaod19a9cd2007-11-18 18:43:45 +0800684 kvm_arch_destroy_vm(kvm);
Avi Kivity6d4e4c42007-11-21 16:41:05 +0200685 mmdrop(mm);
Avi Kivityf17abe92007-02-21 19:28:04 +0200686}
687
Izik Eidusd39f13b2008-03-30 16:01:25 +0300688void kvm_get_kvm(struct kvm *kvm)
689{
690 atomic_inc(&kvm->users_count);
691}
692EXPORT_SYMBOL_GPL(kvm_get_kvm);
693
694void kvm_put_kvm(struct kvm *kvm)
695{
696 if (atomic_dec_and_test(&kvm->users_count))
697 kvm_destroy_vm(kvm);
698}
699EXPORT_SYMBOL_GPL(kvm_put_kvm);
700
701
Avi Kivityf17abe92007-02-21 19:28:04 +0200702static int kvm_vm_release(struct inode *inode, struct file *filp)
703{
704 struct kvm *kvm = filp->private_data;
705
Izik Eidusd39f13b2008-03-30 16:01:25 +0300706 kvm_put_kvm(kvm);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800707 return 0;
708}
709
Avi Kivity6aa8b732006-12-10 02:21:36 -0800710/*
Avi Kivity6aa8b732006-12-10 02:21:36 -0800711 * Allocate some memory and give it an address in the guest physical address
712 * space.
713 *
714 * Discontiguous memory is allowed, mostly for framebuffers.
Sheng Yangf78e0e22007-10-29 09:40:42 +0800715 *
Marcelo Tosatti10589a42007-12-20 19:18:22 -0500716 * Must be called holding mmap_sem for write.
Avi Kivity6aa8b732006-12-10 02:21:36 -0800717 */
Sheng Yangf78e0e22007-10-29 09:40:42 +0800718int __kvm_set_memory_region(struct kvm *kvm,
719 struct kvm_userspace_memory_region *mem,
720 int user_alloc)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800721{
722 int r;
723 gfn_t base_gfn;
724 unsigned long npages;
725 unsigned long i;
726 struct kvm_memory_slot *memslot;
727 struct kvm_memory_slot old, new;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800728
729 r = -EINVAL;
730 /* General sanity checks */
731 if (mem->memory_size & (PAGE_SIZE - 1))
732 goto out;
733 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
734 goto out;
Sheng Yange7cacd42008-11-11 15:30:40 +0800735 if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
Hollis Blanchard78749802008-11-07 13:32:12 -0600736 goto out;
Izik Eiduse0d62c72007-10-24 23:57:46 +0200737 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800738 goto out;
739 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
740 goto out;
741
742 memslot = &kvm->memslots[mem->slot];
743 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
744 npages = mem->memory_size >> PAGE_SHIFT;
745
746 if (!npages)
747 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
748
Avi Kivity6aa8b732006-12-10 02:21:36 -0800749 new = old = *memslot;
750
751 new.base_gfn = base_gfn;
752 new.npages = npages;
753 new.flags = mem->flags;
754
755 /* Disallow changing a memory slot's size. */
756 r = -EINVAL;
757 if (npages && old.npages && npages != old.npages)
Sheng Yangf78e0e22007-10-29 09:40:42 +0800758 goto out_free;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800759
760 /* Check for overlaps */
761 r = -EEXIST;
762 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
763 struct kvm_memory_slot *s = &kvm->memslots[i];
764
765 if (s == memslot)
766 continue;
767 if (!((base_gfn + npages <= s->base_gfn) ||
768 (base_gfn >= s->base_gfn + s->npages)))
Sheng Yangf78e0e22007-10-29 09:40:42 +0800769 goto out_free;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800770 }
Avi Kivity6aa8b732006-12-10 02:21:36 -0800771
Avi Kivity6aa8b732006-12-10 02:21:36 -0800772 /* Free page dirty bitmap if unneeded */
773 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
Al Viro8b6d44c2007-02-09 16:38:40 +0000774 new.dirty_bitmap = NULL;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800775
776 r = -ENOMEM;
777
778 /* Allocate if a slot is being created */
Carsten Otteeff01142008-06-27 15:05:31 +0200779#ifndef CONFIG_S390
Anthony Liguori8d4e1282007-10-18 09:59:34 -0500780 if (npages && !new.rmap) {
Mike Dayd77c26f2007-10-08 09:02:08 -0400781 new.rmap = vmalloc(npages * sizeof(struct page *));
Izik Eidus290fc382007-09-27 14:11:22 +0200782
783 if (!new.rmap)
Sheng Yangf78e0e22007-10-29 09:40:42 +0800784 goto out_free;
Izik Eidus290fc382007-09-27 14:11:22 +0200785
Izik Eidus290fc382007-09-27 14:11:22 +0200786 memset(new.rmap, 0, npages * sizeof(*new.rmap));
Anthony Liguori8d4e1282007-10-18 09:59:34 -0500787
Izik Eidus80b14b52007-10-25 11:54:04 +0200788 new.user_alloc = user_alloc;
Andrea Arcangeli604b38a2008-07-25 16:32:03 +0200789 /*
790 * hva_to_rmmap() serialzies with the mmu_lock and to be
791 * safe it has to ignore memslots with !user_alloc &&
792 * !userspace_addr.
793 */
794 if (user_alloc)
795 new.userspace_addr = mem->userspace_addr;
796 else
797 new.userspace_addr = 0;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800798 }
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300799 if (npages && !new.lpage_info) {
800 int largepages = npages / KVM_PAGES_PER_HPAGE;
801 if (npages % KVM_PAGES_PER_HPAGE)
802 largepages++;
803 if (base_gfn % KVM_PAGES_PER_HPAGE)
804 largepages++;
805
806 new.lpage_info = vmalloc(largepages * sizeof(*new.lpage_info));
807
808 if (!new.lpage_info)
809 goto out_free;
810
811 memset(new.lpage_info, 0, largepages * sizeof(*new.lpage_info));
812
813 if (base_gfn % KVM_PAGES_PER_HPAGE)
814 new.lpage_info[0].write_count = 1;
815 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE)
816 new.lpage_info[largepages-1].write_count = 1;
817 }
Avi Kivity6aa8b732006-12-10 02:21:36 -0800818
819 /* Allocate page dirty bitmap if needed */
820 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
821 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
822
823 new.dirty_bitmap = vmalloc(dirty_bytes);
824 if (!new.dirty_bitmap)
Sheng Yangf78e0e22007-10-29 09:40:42 +0800825 goto out_free;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800826 memset(new.dirty_bitmap, 0, dirty_bytes);
827 }
Carsten Otteeff01142008-06-27 15:05:31 +0200828#endif /* not defined CONFIG_S390 */
Avi Kivity6aa8b732006-12-10 02:21:36 -0800829
Marcelo Tosatti34d4cb82008-07-10 20:49:31 -0300830 if (!npages)
831 kvm_arch_flush_shadow(kvm);
832
Andrea Arcangeli604b38a2008-07-25 16:32:03 +0200833 spin_lock(&kvm->mmu_lock);
834 if (mem->slot >= kvm->nmemslots)
835 kvm->nmemslots = mem->slot + 1;
836
Avi Kivity6aa8b732006-12-10 02:21:36 -0800837 *memslot = new;
Andrea Arcangeli604b38a2008-07-25 16:32:03 +0200838 spin_unlock(&kvm->mmu_lock);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800839
Zhang Xiantao0de10342007-11-20 16:25:04 +0800840 r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
841 if (r) {
Andrea Arcangeli604b38a2008-07-25 16:32:03 +0200842 spin_lock(&kvm->mmu_lock);
Zhang Xiantao0de10342007-11-20 16:25:04 +0800843 *memslot = old;
Andrea Arcangeli604b38a2008-07-25 16:32:03 +0200844 spin_unlock(&kvm->mmu_lock);
Zhang Xiantao0de10342007-11-20 16:25:04 +0800845 goto out_free;
Zhang Xiantao3ad82a72007-11-20 13:11:38 +0800846 }
847
Avi Kivity6aa8b732006-12-10 02:21:36 -0800848 kvm_free_physmem_slot(&old, &new);
Xiantao Zhang8a98f662008-10-06 13:47:38 +0800849#ifdef CONFIG_DMAR
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300850 /* map the pages in iommu page table */
851 r = kvm_iommu_map_pages(kvm, base_gfn, npages);
852 if (r)
853 goto out;
Xiantao Zhang8a98f662008-10-06 13:47:38 +0800854#endif
Avi Kivity6aa8b732006-12-10 02:21:36 -0800855 return 0;
856
Sheng Yangf78e0e22007-10-29 09:40:42 +0800857out_free:
Avi Kivity6aa8b732006-12-10 02:21:36 -0800858 kvm_free_physmem_slot(&new, &old);
859out:
860 return r;
Izik Eidus210c7c42007-10-24 23:52:57 +0200861
862}
Sheng Yangf78e0e22007-10-29 09:40:42 +0800863EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
864
865int kvm_set_memory_region(struct kvm *kvm,
866 struct kvm_userspace_memory_region *mem,
867 int user_alloc)
868{
869 int r;
870
Izik Eidus72dc67a2008-02-10 18:04:15 +0200871 down_write(&kvm->slots_lock);
Sheng Yangf78e0e22007-10-29 09:40:42 +0800872 r = __kvm_set_memory_region(kvm, mem, user_alloc);
Izik Eidus72dc67a2008-02-10 18:04:15 +0200873 up_write(&kvm->slots_lock);
Sheng Yangf78e0e22007-10-29 09:40:42 +0800874 return r;
875}
Izik Eidus210c7c42007-10-24 23:52:57 +0200876EXPORT_SYMBOL_GPL(kvm_set_memory_region);
877
Carsten Otte1fe779f2007-10-29 16:08:35 +0100878int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
879 struct
880 kvm_userspace_memory_region *mem,
881 int user_alloc)
Izik Eidus210c7c42007-10-24 23:52:57 +0200882{
Izik Eiduse0d62c72007-10-24 23:57:46 +0200883 if (mem->slot >= KVM_MEMORY_SLOTS)
884 return -EINVAL;
Izik Eidus210c7c42007-10-24 23:52:57 +0200885 return kvm_set_memory_region(kvm, mem, user_alloc);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800886}
887
Zhang Xiantao5bb064d2007-11-18 20:29:43 +0800888int kvm_get_dirty_log(struct kvm *kvm,
889 struct kvm_dirty_log *log, int *is_dirty)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800890{
891 struct kvm_memory_slot *memslot;
892 int r, i;
893 int n;
894 unsigned long any = 0;
895
Avi Kivity6aa8b732006-12-10 02:21:36 -0800896 r = -EINVAL;
897 if (log->slot >= KVM_MEMORY_SLOTS)
898 goto out;
899
900 memslot = &kvm->memslots[log->slot];
901 r = -ENOENT;
902 if (!memslot->dirty_bitmap)
903 goto out;
904
Uri Lublincd1a4a92007-02-22 16:43:09 +0200905 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800906
Uri Lublincd1a4a92007-02-22 16:43:09 +0200907 for (i = 0; !any && i < n/sizeof(long); ++i)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800908 any = memslot->dirty_bitmap[i];
909
910 r = -EFAULT;
911 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
912 goto out;
913
Zhang Xiantao5bb064d2007-11-18 20:29:43 +0800914 if (any)
915 *is_dirty = 1;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800916
917 r = 0;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800918out:
Avi Kivity6aa8b732006-12-10 02:21:36 -0800919 return r;
920}
921
Izik Eiduscea7bb22007-10-17 19:17:48 +0200922int is_error_page(struct page *page)
923{
924 return page == bad_page;
925}
926EXPORT_SYMBOL_GPL(is_error_page);
927
Anthony Liguori35149e22008-04-02 14:46:56 -0500928int is_error_pfn(pfn_t pfn)
929{
930 return pfn == bad_pfn;
931}
932EXPORT_SYMBOL_GPL(is_error_pfn);
933
Izik Eidusf9d46eb2007-11-11 22:02:22 +0200934static inline unsigned long bad_hva(void)
935{
936 return PAGE_OFFSET;
937}
938
939int kvm_is_error_hva(unsigned long addr)
940{
941 return addr == bad_hva();
942}
943EXPORT_SYMBOL_GPL(kvm_is_error_hva);
944
Izik Eidus28430992008-10-03 17:40:32 +0300945struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800946{
947 int i;
948
949 for (i = 0; i < kvm->nmemslots; ++i) {
950 struct kvm_memory_slot *memslot = &kvm->memslots[i];
951
952 if (gfn >= memslot->base_gfn
953 && gfn < memslot->base_gfn + memslot->npages)
954 return memslot;
955 }
Al Viro8b6d44c2007-02-09 16:38:40 +0000956 return NULL;
Avi Kivity6aa8b732006-12-10 02:21:36 -0800957}
Izik Eidus28430992008-10-03 17:40:32 +0300958EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased);
Avi Kivitye8207542007-03-30 16:54:30 +0300959
960struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
961{
962 gfn = unalias_gfn(kvm, gfn);
Izik Eidus28430992008-10-03 17:40:32 +0300963 return gfn_to_memslot_unaliased(kvm, gfn);
Avi Kivitye8207542007-03-30 16:54:30 +0300964}
Avi Kivity6aa8b732006-12-10 02:21:36 -0800965
Izik Eiduse0d62c72007-10-24 23:57:46 +0200966int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
967{
968 int i;
969
970 gfn = unalias_gfn(kvm, gfn);
971 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
972 struct kvm_memory_slot *memslot = &kvm->memslots[i];
973
974 if (gfn >= memslot->base_gfn
975 && gfn < memslot->base_gfn + memslot->npages)
976 return 1;
977 }
978 return 0;
979}
980EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
981
Marcelo Tosatti05da4552008-02-23 11:44:30 -0300982unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
Izik Eidus539cb662007-11-11 22:05:04 +0200983{
984 struct kvm_memory_slot *slot;
985
986 gfn = unalias_gfn(kvm, gfn);
Izik Eidus28430992008-10-03 17:40:32 +0300987 slot = gfn_to_memslot_unaliased(kvm, gfn);
Izik Eidus539cb662007-11-11 22:05:04 +0200988 if (!slot)
989 return bad_hva();
990 return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
991}
Sheng Yang0d150292008-04-25 21:44:50 +0800992EXPORT_SYMBOL_GPL(gfn_to_hva);
Izik Eidus539cb662007-11-11 22:05:04 +0200993
Anthony Liguori35149e22008-04-02 14:46:56 -0500994pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
Avi Kivity954bbbc2007-03-30 14:02:32 +0300995{
Anthony Liguori8d4e1282007-10-18 09:59:34 -0500996 struct page *page[1];
Izik Eidus539cb662007-11-11 22:05:04 +0200997 unsigned long addr;
Anthony Liguori8d4e1282007-10-18 09:59:34 -0500998 int npages;
Anthony Liguori2e2e3732008-04-30 15:37:07 -0500999 pfn_t pfn;
Avi Kivity954bbbc2007-03-30 14:02:32 +03001000
Avi Kivity60395222007-10-21 11:03:36 +02001001 might_sleep();
1002
Izik Eidus539cb662007-11-11 22:05:04 +02001003 addr = gfn_to_hva(kvm, gfn);
1004 if (kvm_is_error_hva(addr)) {
Izik Eidus8a7ae052007-10-18 11:09:33 +02001005 get_page(bad_page);
Anthony Liguori35149e22008-04-02 14:46:56 -05001006 return page_to_pfn(bad_page);
Izik Eidus8a7ae052007-10-18 11:09:33 +02001007 }
Izik Eidus8a7ae052007-10-18 11:09:33 +02001008
Marcelo Tosatti4c2155c2008-09-16 20:54:47 -03001009 npages = get_user_pages_fast(addr, 1, 1, page);
Izik Eidus539cb662007-11-11 22:05:04 +02001010
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001011 if (unlikely(npages != 1)) {
1012 struct vm_area_struct *vma;
Anthony Liguori8d4e1282007-10-18 09:59:34 -05001013
Marcelo Tosatti4c2155c2008-09-16 20:54:47 -03001014 down_read(&current->mm->mmap_sem);
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001015 vma = find_vma(current->mm, addr);
Marcelo Tosatti4c2155c2008-09-16 20:54:47 -03001016
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001017 if (vma == NULL || addr < vma->vm_start ||
1018 !(vma->vm_flags & VM_PFNMAP)) {
Marcelo Tosatti4c2155c2008-09-16 20:54:47 -03001019 up_read(&current->mm->mmap_sem);
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001020 get_page(bad_page);
1021 return page_to_pfn(bad_page);
1022 }
1023
1024 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
Marcelo Tosatti4c2155c2008-09-16 20:54:47 -03001025 up_read(&current->mm->mmap_sem);
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001026 BUG_ON(!kvm_is_mmio_pfn(pfn));
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001027 } else
1028 pfn = page_to_pfn(page[0]);
1029
1030 return pfn;
Anthony Liguori35149e22008-04-02 14:46:56 -05001031}
1032
1033EXPORT_SYMBOL_GPL(gfn_to_pfn);
1034
1035struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1036{
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001037 pfn_t pfn;
1038
1039 pfn = gfn_to_pfn(kvm, gfn);
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001040 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001041 return pfn_to_page(pfn);
1042
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001043 WARN_ON(kvm_is_mmio_pfn(pfn));
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001044
1045 get_page(bad_page);
1046 return bad_page;
Avi Kivity954bbbc2007-03-30 14:02:32 +03001047}
Anthony Liguoriaab61cc2007-10-29 15:15:20 -05001048
Avi Kivity954bbbc2007-03-30 14:02:32 +03001049EXPORT_SYMBOL_GPL(gfn_to_page);
1050
Izik Eidusb4231d62007-11-20 11:49:33 +02001051void kvm_release_page_clean(struct page *page)
1052{
Anthony Liguori35149e22008-04-02 14:46:56 -05001053 kvm_release_pfn_clean(page_to_pfn(page));
Izik Eidusb4231d62007-11-20 11:49:33 +02001054}
1055EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1056
Anthony Liguori35149e22008-04-02 14:46:56 -05001057void kvm_release_pfn_clean(pfn_t pfn)
1058{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001059 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001060 put_page(pfn_to_page(pfn));
Anthony Liguori35149e22008-04-02 14:46:56 -05001061}
1062EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1063
Izik Eidusb4231d62007-11-20 11:49:33 +02001064void kvm_release_page_dirty(struct page *page)
Izik Eidus8a7ae052007-10-18 11:09:33 +02001065{
Anthony Liguori35149e22008-04-02 14:46:56 -05001066 kvm_release_pfn_dirty(page_to_pfn(page));
Izik Eidus8a7ae052007-10-18 11:09:33 +02001067}
Izik Eidusb4231d62007-11-20 11:49:33 +02001068EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
Izik Eidus8a7ae052007-10-18 11:09:33 +02001069
Anthony Liguori35149e22008-04-02 14:46:56 -05001070void kvm_release_pfn_dirty(pfn_t pfn)
1071{
1072 kvm_set_pfn_dirty(pfn);
1073 kvm_release_pfn_clean(pfn);
1074}
1075EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1076
1077void kvm_set_page_dirty(struct page *page)
1078{
1079 kvm_set_pfn_dirty(page_to_pfn(page));
1080}
1081EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1082
1083void kvm_set_pfn_dirty(pfn_t pfn)
1084{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001085 if (!kvm_is_mmio_pfn(pfn)) {
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001086 struct page *page = pfn_to_page(pfn);
1087 if (!PageReserved(page))
1088 SetPageDirty(page);
1089 }
Anthony Liguori35149e22008-04-02 14:46:56 -05001090}
1091EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1092
1093void kvm_set_pfn_accessed(pfn_t pfn)
1094{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001095 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001096 mark_page_accessed(pfn_to_page(pfn));
Anthony Liguori35149e22008-04-02 14:46:56 -05001097}
1098EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1099
1100void kvm_get_pfn(pfn_t pfn)
1101{
Xiantao Zhangc77fb9d2008-09-27 10:55:40 +08001102 if (!kvm_is_mmio_pfn(pfn))
Anthony Liguori2e2e3732008-04-30 15:37:07 -05001103 get_page(pfn_to_page(pfn));
Anthony Liguori35149e22008-04-02 14:46:56 -05001104}
1105EXPORT_SYMBOL_GPL(kvm_get_pfn);
1106
Izik Eidus195aefd2007-10-01 22:14:18 +02001107static int next_segment(unsigned long len, int offset)
1108{
1109 if (len > PAGE_SIZE - offset)
1110 return PAGE_SIZE - offset;
1111 else
1112 return len;
1113}
1114
1115int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1116 int len)
1117{
Izik Eiduse0506bc2007-11-11 22:10:22 +02001118 int r;
1119 unsigned long addr;
Izik Eidus195aefd2007-10-01 22:14:18 +02001120
Izik Eiduse0506bc2007-11-11 22:10:22 +02001121 addr = gfn_to_hva(kvm, gfn);
1122 if (kvm_is_error_hva(addr))
Izik Eidus195aefd2007-10-01 22:14:18 +02001123 return -EFAULT;
Izik Eiduse0506bc2007-11-11 22:10:22 +02001124 r = copy_from_user(data, (void __user *)addr + offset, len);
1125 if (r)
1126 return -EFAULT;
Izik Eidus195aefd2007-10-01 22:14:18 +02001127 return 0;
1128}
1129EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1130
1131int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1132{
1133 gfn_t gfn = gpa >> PAGE_SHIFT;
1134 int seg;
1135 int offset = offset_in_page(gpa);
1136 int ret;
1137
1138 while ((seg = next_segment(len, offset)) != 0) {
1139 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1140 if (ret < 0)
1141 return ret;
1142 offset = 0;
1143 len -= seg;
1144 data += seg;
1145 ++gfn;
1146 }
1147 return 0;
1148}
1149EXPORT_SYMBOL_GPL(kvm_read_guest);
1150
Marcelo Tosatti7ec54582007-12-20 19:18:23 -05001151int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1152 unsigned long len)
1153{
1154 int r;
1155 unsigned long addr;
1156 gfn_t gfn = gpa >> PAGE_SHIFT;
1157 int offset = offset_in_page(gpa);
1158
1159 addr = gfn_to_hva(kvm, gfn);
1160 if (kvm_is_error_hva(addr))
1161 return -EFAULT;
Andrea Arcangeli0aac03f2008-01-30 19:57:35 +01001162 pagefault_disable();
Marcelo Tosatti7ec54582007-12-20 19:18:23 -05001163 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
Andrea Arcangeli0aac03f2008-01-30 19:57:35 +01001164 pagefault_enable();
Marcelo Tosatti7ec54582007-12-20 19:18:23 -05001165 if (r)
1166 return -EFAULT;
1167 return 0;
1168}
1169EXPORT_SYMBOL(kvm_read_guest_atomic);
1170
Izik Eidus195aefd2007-10-01 22:14:18 +02001171int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1172 int offset, int len)
1173{
Izik Eiduse0506bc2007-11-11 22:10:22 +02001174 int r;
1175 unsigned long addr;
Izik Eidus195aefd2007-10-01 22:14:18 +02001176
Izik Eiduse0506bc2007-11-11 22:10:22 +02001177 addr = gfn_to_hva(kvm, gfn);
1178 if (kvm_is_error_hva(addr))
Izik Eidus195aefd2007-10-01 22:14:18 +02001179 return -EFAULT;
Izik Eiduse0506bc2007-11-11 22:10:22 +02001180 r = copy_to_user((void __user *)addr + offset, data, len);
1181 if (r)
1182 return -EFAULT;
Izik Eidus195aefd2007-10-01 22:14:18 +02001183 mark_page_dirty(kvm, gfn);
1184 return 0;
1185}
1186EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1187
1188int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1189 unsigned long len)
1190{
1191 gfn_t gfn = gpa >> PAGE_SHIFT;
1192 int seg;
1193 int offset = offset_in_page(gpa);
1194 int ret;
1195
1196 while ((seg = next_segment(len, offset)) != 0) {
1197 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1198 if (ret < 0)
1199 return ret;
1200 offset = 0;
1201 len -= seg;
1202 data += seg;
1203 ++gfn;
1204 }
1205 return 0;
1206}
1207
1208int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1209{
Izik Eidus3e021bf2007-11-19 11:16:57 +02001210 return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
Izik Eidus195aefd2007-10-01 22:14:18 +02001211}
1212EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1213
1214int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1215{
1216 gfn_t gfn = gpa >> PAGE_SHIFT;
1217 int seg;
1218 int offset = offset_in_page(gpa);
1219 int ret;
1220
1221 while ((seg = next_segment(len, offset)) != 0) {
1222 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1223 if (ret < 0)
1224 return ret;
1225 offset = 0;
1226 len -= seg;
1227 ++gfn;
1228 }
1229 return 0;
1230}
1231EXPORT_SYMBOL_GPL(kvm_clear_guest);
1232
Avi Kivity6aa8b732006-12-10 02:21:36 -08001233void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1234{
Nguyen Anh Quynh31389942007-06-05 10:35:19 +03001235 struct kvm_memory_slot *memslot;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001236
Uri Lublin3b6fff12007-10-30 10:42:09 +02001237 gfn = unalias_gfn(kvm, gfn);
Izik Eidus28430992008-10-03 17:40:32 +03001238 memslot = gfn_to_memslot_unaliased(kvm, gfn);
Rusty Russell7e9d6192007-07-31 20:41:14 +10001239 if (memslot && memslot->dirty_bitmap) {
1240 unsigned long rel_gfn = gfn - memslot->base_gfn;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001241
Rusty Russell7e9d6192007-07-31 20:41:14 +10001242 /* avoid RMW */
1243 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
1244 set_bit(rel_gfn, memslot->dirty_bitmap);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001245 }
1246}
1247
Eddie Dongb6958ce2007-07-18 12:15:21 +03001248/*
1249 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1250 */
Hollis Blanchard8776e512007-10-31 17:24:24 -05001251void kvm_vcpu_block(struct kvm_vcpu *vcpu)
Eddie Dongb6958ce2007-07-18 12:15:21 +03001252{
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001253 DEFINE_WAIT(wait);
Eddie Dongb6958ce2007-07-18 12:15:21 +03001254
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001255 for (;;) {
1256 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
Eddie Dongb6958ce2007-07-18 12:15:21 +03001257
Marcelo Tosattid7690172008-09-08 15:23:48 -03001258 if (kvm_cpu_has_interrupt(vcpu) ||
1259 kvm_cpu_has_pending_timer(vcpu) ||
1260 kvm_arch_vcpu_runnable(vcpu)) {
1261 set_bit(KVM_REQ_UNHALT, &vcpu->requests);
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001262 break;
Marcelo Tosattid7690172008-09-08 15:23:48 -03001263 }
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001264 if (signal_pending(current))
1265 break;
1266
Eddie Dongb6958ce2007-07-18 12:15:21 +03001267 vcpu_put(vcpu);
1268 schedule();
1269 vcpu_load(vcpu);
1270 }
1271
Marcelo Tosattie5c239c2008-05-08 19:47:01 -03001272 finish_wait(&vcpu->wq, &wait);
Eddie Dongb6958ce2007-07-18 12:15:21 +03001273}
1274
Avi Kivity6aa8b732006-12-10 02:21:36 -08001275void kvm_resched(struct kvm_vcpu *vcpu)
1276{
Yaozu Dong3fca0362007-04-25 16:49:19 +03001277 if (!need_resched())
1278 return;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001279 cond_resched();
Avi Kivity6aa8b732006-12-10 02:21:36 -08001280}
1281EXPORT_SYMBOL_GPL(kvm_resched);
1282
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001283static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001284{
1285 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001286 struct page *page;
1287
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001288 if (vmf->pgoff == 0)
Avi Kivity039576c2007-03-20 12:46:50 +02001289 page = virt_to_page(vcpu->run);
Avi Kivity09566762008-01-23 18:14:23 +02001290#ifdef CONFIG_X86
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001291 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
Zhang Xiantaoad312c72007-12-13 23:50:52 +08001292 page = virt_to_page(vcpu->arch.pio_data);
Avi Kivity09566762008-01-23 18:14:23 +02001293#endif
Laurent Vivier5f94c172008-05-30 16:05:54 +02001294#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1295 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1296 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1297#endif
Avi Kivity039576c2007-03-20 12:46:50 +02001298 else
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001299 return VM_FAULT_SIGBUS;
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001300 get_page(page);
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001301 vmf->page = page;
1302 return 0;
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001303}
1304
1305static struct vm_operations_struct kvm_vcpu_vm_ops = {
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001306 .fault = kvm_vcpu_fault,
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001307};
1308
1309static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1310{
1311 vma->vm_ops = &kvm_vcpu_vm_ops;
1312 return 0;
1313}
1314
Avi Kivitybccf2152007-02-21 18:04:26 +02001315static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1316{
1317 struct kvm_vcpu *vcpu = filp->private_data;
1318
Al Viro66c0b392008-04-19 20:33:56 +01001319 kvm_put_kvm(vcpu->kvm);
Avi Kivitybccf2152007-02-21 18:04:26 +02001320 return 0;
1321}
1322
Jan Engelhardt5c502742008-01-22 20:46:14 +01001323static const struct file_operations kvm_vcpu_fops = {
Avi Kivitybccf2152007-02-21 18:04:26 +02001324 .release = kvm_vcpu_release,
1325 .unlocked_ioctl = kvm_vcpu_ioctl,
1326 .compat_ioctl = kvm_vcpu_ioctl,
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001327 .mmap = kvm_vcpu_mmap,
Avi Kivitybccf2152007-02-21 18:04:26 +02001328};
1329
1330/*
1331 * Allocates an inode for the vcpu.
1332 */
1333static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1334{
Ulrich Drepper7d9dbca2008-07-23 21:29:22 -07001335 int fd = anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, 0);
Al Viro2030a422008-02-23 06:46:49 -05001336 if (fd < 0)
Al Viro66c0b392008-04-19 20:33:56 +01001337 kvm_put_kvm(vcpu->kvm);
Avi Kivitybccf2152007-02-21 18:04:26 +02001338 return fd;
Avi Kivitybccf2152007-02-21 18:04:26 +02001339}
1340
Avi Kivityc5ea7662007-02-20 18:41:05 +02001341/*
1342 * Creates some virtual cpus. Good luck creating more than one.
1343 */
1344static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
1345{
1346 int r;
1347 struct kvm_vcpu *vcpu;
1348
Avi Kivityc5ea7662007-02-20 18:41:05 +02001349 if (!valid_vcpu(n))
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001350 return -EINVAL;
Avi Kivityc5ea7662007-02-20 18:41:05 +02001351
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08001352 vcpu = kvm_arch_vcpu_create(kvm, n);
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001353 if (IS_ERR(vcpu))
1354 return PTR_ERR(vcpu);
Avi Kivityc5ea7662007-02-20 18:41:05 +02001355
Avi Kivity15ad7142007-07-11 18:17:21 +03001356 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1357
Avi Kivity26e52152007-11-20 15:30:24 +02001358 r = kvm_arch_vcpu_setup(vcpu);
1359 if (r)
Glauber Costa7d8fece2008-09-17 23:16:59 -03001360 return r;
Avi Kivity26e52152007-11-20 15:30:24 +02001361
Shaohua Li11ec2802007-07-23 14:51:37 +08001362 mutex_lock(&kvm->lock);
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001363 if (kvm->vcpus[n]) {
1364 r = -EEXIST;
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08001365 goto vcpu_destroy;
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001366 }
1367 kvm->vcpus[n] = vcpu;
Shaohua Li11ec2802007-07-23 14:51:37 +08001368 mutex_unlock(&kvm->lock);
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001369
1370 /* Now it's all set up, let userspace reach it */
Al Viro66c0b392008-04-19 20:33:56 +01001371 kvm_get_kvm(kvm);
Avi Kivitybccf2152007-02-21 18:04:26 +02001372 r = create_vcpu_fd(vcpu);
1373 if (r < 0)
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001374 goto unlink;
Avi Kivitybccf2152007-02-21 18:04:26 +02001375 return r;
Avi Kivityc5ea7662007-02-20 18:41:05 +02001376
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001377unlink:
Shaohua Li11ec2802007-07-23 14:51:37 +08001378 mutex_lock(&kvm->lock);
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001379 kvm->vcpus[n] = NULL;
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08001380vcpu_destroy:
Glauber Costa7d8fece2008-09-17 23:16:59 -03001381 mutex_unlock(&kvm->lock);
Hollis Blanchardd40ccc62007-11-19 14:04:43 -06001382 kvm_arch_vcpu_destroy(vcpu);
Avi Kivityc5ea7662007-02-20 18:41:05 +02001383 return r;
1384}
1385
Avi Kivity1961d272007-03-05 19:46:05 +02001386static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1387{
1388 if (sigset) {
1389 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1390 vcpu->sigset_active = 1;
1391 vcpu->sigset = *sigset;
1392 } else
1393 vcpu->sigset_active = 0;
1394 return 0;
1395}
1396
Avi Kivitybccf2152007-02-21 18:04:26 +02001397static long kvm_vcpu_ioctl(struct file *filp,
1398 unsigned int ioctl, unsigned long arg)
Avi Kivity6aa8b732006-12-10 02:21:36 -08001399{
Avi Kivitybccf2152007-02-21 18:04:26 +02001400 struct kvm_vcpu *vcpu = filp->private_data;
Al Viro2f366982007-02-09 16:38:35 +00001401 void __user *argp = (void __user *)arg;
Carsten Otte313a3dc2007-10-11 19:16:52 +02001402 int r;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001403 struct kvm_fpu *fpu = NULL;
1404 struct kvm_sregs *kvm_sregs = NULL;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001405
Avi Kivity6d4e4c42007-11-21 16:41:05 +02001406 if (vcpu->kvm->mm != current->mm)
1407 return -EIO;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001408 switch (ioctl) {
Avi Kivity9a2bb7f2007-02-22 12:58:31 +02001409 case KVM_RUN:
Avi Kivityf0fe5102007-03-07 13:11:17 +02001410 r = -EINVAL;
1411 if (arg)
1412 goto out;
Hollis Blanchardb6c7a5d2007-11-01 14:16:10 -05001413 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001414 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001415 case KVM_GET_REGS: {
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001416 struct kvm_regs *kvm_regs;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001417
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001418 r = -ENOMEM;
1419 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1420 if (!kvm_regs)
1421 goto out;
1422 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001423 if (r)
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001424 goto out_free1;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001425 r = -EFAULT;
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001426 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1427 goto out_free1;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001428 r = 0;
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001429out_free1:
1430 kfree(kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001431 break;
1432 }
1433 case KVM_SET_REGS: {
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001434 struct kvm_regs *kvm_regs;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001435
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001436 r = -ENOMEM;
1437 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1438 if (!kvm_regs)
1439 goto out;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001440 r = -EFAULT;
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001441 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1442 goto out_free2;
1443 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001444 if (r)
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001445 goto out_free2;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001446 r = 0;
Xiantao Zhang3e4bb3a2008-02-25 18:52:20 +08001447out_free2:
1448 kfree(kvm_regs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001449 break;
1450 }
1451 case KVM_GET_SREGS: {
Dave Hansenfa3795a2008-08-11 10:01:46 -07001452 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1453 r = -ENOMEM;
1454 if (!kvm_sregs)
1455 goto out;
1456 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001457 if (r)
1458 goto out;
1459 r = -EFAULT;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001460 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001461 goto out;
1462 r = 0;
1463 break;
1464 }
1465 case KVM_SET_SREGS: {
Dave Hansenfa3795a2008-08-11 10:01:46 -07001466 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1467 r = -ENOMEM;
1468 if (!kvm_sregs)
Avi Kivity6aa8b732006-12-10 02:21:36 -08001469 goto out;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001470 r = -EFAULT;
1471 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1472 goto out;
1473 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001474 if (r)
1475 goto out;
1476 r = 0;
1477 break;
1478 }
Marcelo Tosatti62d9f0d2008-04-11 13:24:45 -03001479 case KVM_GET_MP_STATE: {
1480 struct kvm_mp_state mp_state;
1481
1482 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1483 if (r)
1484 goto out;
1485 r = -EFAULT;
1486 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1487 goto out;
1488 r = 0;
1489 break;
1490 }
1491 case KVM_SET_MP_STATE: {
1492 struct kvm_mp_state mp_state;
1493
1494 r = -EFAULT;
1495 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1496 goto out;
1497 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1498 if (r)
1499 goto out;
1500 r = 0;
1501 break;
1502 }
Avi Kivity6aa8b732006-12-10 02:21:36 -08001503 case KVM_TRANSLATE: {
1504 struct kvm_translation tr;
1505
1506 r = -EFAULT;
Al Viro2f366982007-02-09 16:38:35 +00001507 if (copy_from_user(&tr, argp, sizeof tr))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001508 goto out;
Zhang Xiantao8b006792007-11-16 13:05:55 +08001509 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001510 if (r)
1511 goto out;
1512 r = -EFAULT;
Al Viro2f366982007-02-09 16:38:35 +00001513 if (copy_to_user(argp, &tr, sizeof tr))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001514 goto out;
1515 r = 0;
1516 break;
1517 }
Avi Kivity6aa8b732006-12-10 02:21:36 -08001518 case KVM_DEBUG_GUEST: {
1519 struct kvm_debug_guest dbg;
1520
1521 r = -EFAULT;
Al Viro2f366982007-02-09 16:38:35 +00001522 if (copy_from_user(&dbg, argp, sizeof dbg))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001523 goto out;
Hollis Blanchardb6c7a5d2007-11-01 14:16:10 -05001524 r = kvm_arch_vcpu_ioctl_debug_guest(vcpu, &dbg);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001525 if (r)
1526 goto out;
1527 r = 0;
1528 break;
1529 }
Avi Kivity1961d272007-03-05 19:46:05 +02001530 case KVM_SET_SIGNAL_MASK: {
1531 struct kvm_signal_mask __user *sigmask_arg = argp;
1532 struct kvm_signal_mask kvm_sigmask;
1533 sigset_t sigset, *p;
1534
1535 p = NULL;
1536 if (argp) {
1537 r = -EFAULT;
1538 if (copy_from_user(&kvm_sigmask, argp,
1539 sizeof kvm_sigmask))
1540 goto out;
1541 r = -EINVAL;
1542 if (kvm_sigmask.len != sizeof sigset)
1543 goto out;
1544 r = -EFAULT;
1545 if (copy_from_user(&sigset, sigmask_arg->sigset,
1546 sizeof sigset))
1547 goto out;
1548 p = &sigset;
1549 }
1550 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1551 break;
1552 }
Avi Kivityb8836732007-04-01 16:34:31 +03001553 case KVM_GET_FPU: {
Dave Hansenfa3795a2008-08-11 10:01:46 -07001554 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1555 r = -ENOMEM;
1556 if (!fpu)
1557 goto out;
1558 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
Avi Kivityb8836732007-04-01 16:34:31 +03001559 if (r)
1560 goto out;
1561 r = -EFAULT;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001562 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
Avi Kivityb8836732007-04-01 16:34:31 +03001563 goto out;
1564 r = 0;
1565 break;
1566 }
1567 case KVM_SET_FPU: {
Dave Hansenfa3795a2008-08-11 10:01:46 -07001568 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1569 r = -ENOMEM;
1570 if (!fpu)
Avi Kivityb8836732007-04-01 16:34:31 +03001571 goto out;
Dave Hansenfa3795a2008-08-11 10:01:46 -07001572 r = -EFAULT;
1573 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1574 goto out;
1575 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
Avi Kivityb8836732007-04-01 16:34:31 +03001576 if (r)
1577 goto out;
1578 r = 0;
1579 break;
1580 }
Avi Kivitybccf2152007-02-21 18:04:26 +02001581 default:
Carsten Otte313a3dc2007-10-11 19:16:52 +02001582 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
Avi Kivitybccf2152007-02-21 18:04:26 +02001583 }
1584out:
Dave Hansenfa3795a2008-08-11 10:01:46 -07001585 kfree(fpu);
1586 kfree(kvm_sregs);
Avi Kivitybccf2152007-02-21 18:04:26 +02001587 return r;
1588}
1589
1590static long kvm_vm_ioctl(struct file *filp,
1591 unsigned int ioctl, unsigned long arg)
1592{
1593 struct kvm *kvm = filp->private_data;
1594 void __user *argp = (void __user *)arg;
Carsten Otte1fe779f2007-10-29 16:08:35 +01001595 int r;
Avi Kivitybccf2152007-02-21 18:04:26 +02001596
Avi Kivity6d4e4c42007-11-21 16:41:05 +02001597 if (kvm->mm != current->mm)
1598 return -EIO;
Avi Kivitybccf2152007-02-21 18:04:26 +02001599 switch (ioctl) {
1600 case KVM_CREATE_VCPU:
1601 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1602 if (r < 0)
1603 goto out;
1604 break;
Izik Eidus6fc138d2007-10-09 19:20:39 +02001605 case KVM_SET_USER_MEMORY_REGION: {
1606 struct kvm_userspace_memory_region kvm_userspace_mem;
1607
1608 r = -EFAULT;
1609 if (copy_from_user(&kvm_userspace_mem, argp,
1610 sizeof kvm_userspace_mem))
1611 goto out;
1612
1613 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001614 if (r)
1615 goto out;
1616 break;
1617 }
1618 case KVM_GET_DIRTY_LOG: {
1619 struct kvm_dirty_log log;
1620
1621 r = -EFAULT;
Al Viro2f366982007-02-09 16:38:35 +00001622 if (copy_from_user(&log, argp, sizeof log))
Avi Kivity6aa8b732006-12-10 02:21:36 -08001623 goto out;
Avi Kivity2c6f5df2007-02-20 18:27:58 +02001624 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001625 if (r)
1626 goto out;
1627 break;
1628 }
Laurent Vivier5f94c172008-05-30 16:05:54 +02001629#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1630 case KVM_REGISTER_COALESCED_MMIO: {
1631 struct kvm_coalesced_mmio_zone zone;
1632 r = -EFAULT;
1633 if (copy_from_user(&zone, argp, sizeof zone))
1634 goto out;
1635 r = -ENXIO;
1636 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1637 if (r)
1638 goto out;
1639 r = 0;
1640 break;
1641 }
1642 case KVM_UNREGISTER_COALESCED_MMIO: {
1643 struct kvm_coalesced_mmio_zone zone;
1644 r = -EFAULT;
1645 if (copy_from_user(&zone, argp, sizeof zone))
1646 goto out;
1647 r = -ENXIO;
1648 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1649 if (r)
1650 goto out;
1651 r = 0;
1652 break;
1653 }
1654#endif
Xiantao Zhang8a98f662008-10-06 13:47:38 +08001655#ifdef KVM_CAP_DEVICE_ASSIGNMENT
1656 case KVM_ASSIGN_PCI_DEVICE: {
1657 struct kvm_assigned_pci_dev assigned_dev;
1658
1659 r = -EFAULT;
1660 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
1661 goto out;
1662 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
1663 if (r)
1664 goto out;
1665 break;
1666 }
1667 case KVM_ASSIGN_IRQ: {
1668 struct kvm_assigned_irq assigned_irq;
1669
1670 r = -EFAULT;
1671 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
1672 goto out;
1673 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
1674 if (r)
1675 goto out;
1676 break;
1677 }
1678#endif
Avi Kivityf17abe92007-02-21 19:28:04 +02001679 default:
Carsten Otte1fe779f2007-10-29 16:08:35 +01001680 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
Avi Kivityf17abe92007-02-21 19:28:04 +02001681 }
1682out:
1683 return r;
1684}
1685
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001686static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Avi Kivityf17abe92007-02-21 19:28:04 +02001687{
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03001688 struct page *page[1];
1689 unsigned long addr;
1690 int npages;
1691 gfn_t gfn = vmf->pgoff;
Avi Kivityf17abe92007-02-21 19:28:04 +02001692 struct kvm *kvm = vma->vm_file->private_data;
Avi Kivityf17abe92007-02-21 19:28:04 +02001693
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03001694 addr = gfn_to_hva(kvm, gfn);
1695 if (kvm_is_error_hva(addr))
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001696 return VM_FAULT_SIGBUS;
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03001697
1698 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
1699 NULL);
1700 if (unlikely(npages != 1))
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001701 return VM_FAULT_SIGBUS;
Marcelo Tosatti777b3f42008-09-16 20:54:46 -03001702
1703 vmf->page = page[0];
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001704 return 0;
Avi Kivityf17abe92007-02-21 19:28:04 +02001705}
1706
1707static struct vm_operations_struct kvm_vm_vm_ops = {
npiggin@suse.dee4a533a2007-12-05 18:15:52 +11001708 .fault = kvm_vm_fault,
Avi Kivityf17abe92007-02-21 19:28:04 +02001709};
1710
1711static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1712{
1713 vma->vm_ops = &kvm_vm_vm_ops;
1714 return 0;
1715}
1716
Jan Engelhardt5c502742008-01-22 20:46:14 +01001717static const struct file_operations kvm_vm_fops = {
Avi Kivityf17abe92007-02-21 19:28:04 +02001718 .release = kvm_vm_release,
1719 .unlocked_ioctl = kvm_vm_ioctl,
1720 .compat_ioctl = kvm_vm_ioctl,
1721 .mmap = kvm_vm_mmap,
1722};
1723
1724static int kvm_dev_ioctl_create_vm(void)
1725{
Al Viro2030a422008-02-23 06:46:49 -05001726 int fd;
Avi Kivityf17abe92007-02-21 19:28:04 +02001727 struct kvm *kvm;
1728
Avi Kivityf17abe92007-02-21 19:28:04 +02001729 kvm = kvm_create_vm();
Avi Kivityd6d28162007-06-28 08:38:16 -04001730 if (IS_ERR(kvm))
1731 return PTR_ERR(kvm);
Ulrich Drepper7d9dbca2008-07-23 21:29:22 -07001732 fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, 0);
Al Viro2030a422008-02-23 06:46:49 -05001733 if (fd < 0)
Al Viro66c0b392008-04-19 20:33:56 +01001734 kvm_put_kvm(kvm);
Avi Kivityf17abe92007-02-21 19:28:04 +02001735
Avi Kivityf17abe92007-02-21 19:28:04 +02001736 return fd;
Avi Kivityf17abe92007-02-21 19:28:04 +02001737}
1738
1739static long kvm_dev_ioctl(struct file *filp,
1740 unsigned int ioctl, unsigned long arg)
1741{
Avi Kivity07c45a32007-03-07 13:05:38 +02001742 long r = -EINVAL;
Avi Kivityf17abe92007-02-21 19:28:04 +02001743
1744 switch (ioctl) {
1745 case KVM_GET_API_VERSION:
Avi Kivityf0fe5102007-03-07 13:11:17 +02001746 r = -EINVAL;
1747 if (arg)
1748 goto out;
Avi Kivityf17abe92007-02-21 19:28:04 +02001749 r = KVM_API_VERSION;
1750 break;
1751 case KVM_CREATE_VM:
Avi Kivityf0fe5102007-03-07 13:11:17 +02001752 r = -EINVAL;
1753 if (arg)
1754 goto out;
Avi Kivityf17abe92007-02-21 19:28:04 +02001755 r = kvm_dev_ioctl_create_vm();
1756 break;
Zhang Xiantao018d00d2007-11-15 23:07:47 +08001757 case KVM_CHECK_EXTENSION:
Christian Borntraeger1e1c65e2008-04-21 13:48:24 +02001758 r = kvm_dev_ioctl_check_extension(arg);
Avi Kivity5d308f42007-03-01 17:56:20 +02001759 break;
Avi Kivity07c45a32007-03-07 13:05:38 +02001760 case KVM_GET_VCPU_MMAP_SIZE:
1761 r = -EINVAL;
1762 if (arg)
1763 goto out;
Avi Kivityadb1ff42008-01-24 15:13:08 +02001764 r = PAGE_SIZE; /* struct kvm_run */
1765#ifdef CONFIG_X86
1766 r += PAGE_SIZE; /* pio data page */
1767#endif
Laurent Vivier5f94c172008-05-30 16:05:54 +02001768#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1769 r += PAGE_SIZE; /* coalesced mmio ring page */
1770#endif
Avi Kivity07c45a32007-03-07 13:05:38 +02001771 break;
Feng(Eric) Liud4c9ff22008-04-10 08:47:53 -04001772 case KVM_TRACE_ENABLE:
1773 case KVM_TRACE_PAUSE:
1774 case KVM_TRACE_DISABLE:
1775 r = kvm_trace_ioctl(ioctl, arg);
1776 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08001777 default:
Carsten Otte043405e2007-10-10 17:16:19 +02001778 return kvm_arch_dev_ioctl(filp, ioctl, arg);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001779 }
1780out:
1781 return r;
1782}
1783
Avi Kivity6aa8b732006-12-10 02:21:36 -08001784static struct file_operations kvm_chardev_ops = {
Avi Kivity6aa8b732006-12-10 02:21:36 -08001785 .unlocked_ioctl = kvm_dev_ioctl,
1786 .compat_ioctl = kvm_dev_ioctl,
Avi Kivity6aa8b732006-12-10 02:21:36 -08001787};
1788
1789static struct miscdevice kvm_dev = {
Avi Kivitybbe44322007-03-04 13:27:36 +02001790 KVM_MINOR,
Avi Kivity6aa8b732006-12-10 02:21:36 -08001791 "kvm",
1792 &kvm_chardev_ops,
1793};
1794
Avi Kivity1b6c0162007-05-24 13:03:52 +03001795static void hardware_enable(void *junk)
1796{
1797 int cpu = raw_smp_processor_id();
1798
1799 if (cpu_isset(cpu, cpus_hardware_enabled))
1800 return;
1801 cpu_set(cpu, cpus_hardware_enabled);
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08001802 kvm_arch_hardware_enable(NULL);
Avi Kivity1b6c0162007-05-24 13:03:52 +03001803}
1804
1805static void hardware_disable(void *junk)
1806{
1807 int cpu = raw_smp_processor_id();
1808
1809 if (!cpu_isset(cpu, cpus_hardware_enabled))
1810 return;
1811 cpu_clear(cpu, cpus_hardware_enabled);
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08001812 kvm_arch_hardware_disable(NULL);
Avi Kivity1b6c0162007-05-24 13:03:52 +03001813}
1814
Avi Kivity774c47f2007-02-12 00:54:47 -08001815static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1816 void *v)
1817{
1818 int cpu = (long)v;
1819
Avi Kivity1a6f4d72007-11-11 18:37:32 +02001820 val &= ~CPU_TASKS_FROZEN;
Avi Kivity774c47f2007-02-12 00:54:47 -08001821 switch (val) {
Avi Kivitycec9ad22007-05-24 13:11:41 +03001822 case CPU_DYING:
Avi Kivity6ec8a852007-08-19 15:57:26 +03001823 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1824 cpu);
1825 hardware_disable(NULL);
1826 break;
Avi Kivity774c47f2007-02-12 00:54:47 -08001827 case CPU_UP_CANCELED:
Jeremy Katz43934a32007-02-19 14:37:46 +02001828 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1829 cpu);
Jens Axboe8691e5a2008-06-06 11:18:06 +02001830 smp_call_function_single(cpu, hardware_disable, NULL, 1);
Avi Kivity774c47f2007-02-12 00:54:47 -08001831 break;
Jeremy Katz43934a32007-02-19 14:37:46 +02001832 case CPU_ONLINE:
1833 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1834 cpu);
Jens Axboe8691e5a2008-06-06 11:18:06 +02001835 smp_call_function_single(cpu, hardware_enable, NULL, 1);
Avi Kivity774c47f2007-02-12 00:54:47 -08001836 break;
1837 }
1838 return NOTIFY_OK;
1839}
1840
Avi Kivity4ecac3f2008-05-13 13:23:38 +03001841
1842asmlinkage void kvm_handle_fault_on_reboot(void)
1843{
1844 if (kvm_rebooting)
1845 /* spin while reset goes on */
1846 while (true)
1847 ;
1848 /* Fault while not rebooting. We want the trace. */
1849 BUG();
1850}
1851EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
1852
Rusty Russell9a2b85c2007-07-17 23:17:55 +10001853static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
Mike Dayd77c26f2007-10-08 09:02:08 -04001854 void *v)
Rusty Russell9a2b85c2007-07-17 23:17:55 +10001855{
1856 if (val == SYS_RESTART) {
1857 /*
1858 * Some (well, at least mine) BIOSes hang on reboot if
1859 * in vmx root mode.
1860 */
1861 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
Avi Kivity4ecac3f2008-05-13 13:23:38 +03001862 kvm_rebooting = true;
Jens Axboe15c8b6c2008-05-09 09:39:44 +02001863 on_each_cpu(hardware_disable, NULL, 1);
Rusty Russell9a2b85c2007-07-17 23:17:55 +10001864 }
1865 return NOTIFY_OK;
1866}
1867
1868static struct notifier_block kvm_reboot_notifier = {
1869 .notifier_call = kvm_reboot,
1870 .priority = 0,
1871};
1872
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04001873void kvm_io_bus_init(struct kvm_io_bus *bus)
1874{
1875 memset(bus, 0, sizeof(*bus));
1876}
1877
1878void kvm_io_bus_destroy(struct kvm_io_bus *bus)
1879{
1880 int i;
1881
1882 for (i = 0; i < bus->dev_count; i++) {
1883 struct kvm_io_device *pos = bus->devs[i];
1884
1885 kvm_iodevice_destructor(pos);
1886 }
1887}
1888
Laurent Vivier92760492008-05-30 16:05:53 +02001889struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
1890 gpa_t addr, int len, int is_write)
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04001891{
1892 int i;
1893
1894 for (i = 0; i < bus->dev_count; i++) {
1895 struct kvm_io_device *pos = bus->devs[i];
1896
Laurent Vivier92760492008-05-30 16:05:53 +02001897 if (pos->in_range(pos, addr, len, is_write))
Gregory Haskins2eeb2e92007-05-31 14:08:53 -04001898 return pos;
1899 }
1900
1901 return NULL;
1902}
1903
1904void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
1905{
1906 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
1907
1908 bus->devs[bus->dev_count++] = dev;
1909}
1910
Avi Kivity774c47f2007-02-12 00:54:47 -08001911static struct notifier_block kvm_cpu_notifier = {
1912 .notifier_call = kvm_cpu_hotplug,
1913 .priority = 20, /* must be > scheduler priority */
1914};
1915
Christoph Hellwig8b88b092008-02-08 04:20:26 -08001916static int vm_stat_get(void *_offset, u64 *val)
Avi Kivityba1389b2007-11-18 16:24:12 +02001917{
1918 unsigned offset = (long)_offset;
Avi Kivityba1389b2007-11-18 16:24:12 +02001919 struct kvm *kvm;
1920
Christoph Hellwig8b88b092008-02-08 04:20:26 -08001921 *val = 0;
Avi Kivityba1389b2007-11-18 16:24:12 +02001922 spin_lock(&kvm_lock);
1923 list_for_each_entry(kvm, &vm_list, vm_list)
Christoph Hellwig8b88b092008-02-08 04:20:26 -08001924 *val += *(u32 *)((void *)kvm + offset);
Avi Kivityba1389b2007-11-18 16:24:12 +02001925 spin_unlock(&kvm_lock);
Christoph Hellwig8b88b092008-02-08 04:20:26 -08001926 return 0;
Avi Kivityba1389b2007-11-18 16:24:12 +02001927}
1928
1929DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
1930
Christoph Hellwig8b88b092008-02-08 04:20:26 -08001931static int vcpu_stat_get(void *_offset, u64 *val)
Avi Kivity1165f5f2007-04-19 17:27:43 +03001932{
1933 unsigned offset = (long)_offset;
Avi Kivity1165f5f2007-04-19 17:27:43 +03001934 struct kvm *kvm;
1935 struct kvm_vcpu *vcpu;
1936 int i;
1937
Christoph Hellwig8b88b092008-02-08 04:20:26 -08001938 *val = 0;
Avi Kivity1165f5f2007-04-19 17:27:43 +03001939 spin_lock(&kvm_lock);
1940 list_for_each_entry(kvm, &vm_list, vm_list)
1941 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
Rusty Russellfb3f0f52007-07-27 17:16:56 +10001942 vcpu = kvm->vcpus[i];
1943 if (vcpu)
Christoph Hellwig8b88b092008-02-08 04:20:26 -08001944 *val += *(u32 *)((void *)vcpu + offset);
Avi Kivity1165f5f2007-04-19 17:27:43 +03001945 }
1946 spin_unlock(&kvm_lock);
Christoph Hellwig8b88b092008-02-08 04:20:26 -08001947 return 0;
Avi Kivity1165f5f2007-04-19 17:27:43 +03001948}
1949
Avi Kivityba1389b2007-11-18 16:24:12 +02001950DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
1951
1952static struct file_operations *stat_fops[] = {
1953 [KVM_STAT_VCPU] = &vcpu_stat_fops,
1954 [KVM_STAT_VM] = &vm_stat_fops,
1955};
Avi Kivity1165f5f2007-04-19 17:27:43 +03001956
Zhang Xiantaoa16b0432007-11-16 14:38:21 +08001957static void kvm_init_debug(void)
Avi Kivity6aa8b732006-12-10 02:21:36 -08001958{
1959 struct kvm_stats_debugfs_item *p;
1960
Hollis Blanchard76f7c872008-04-15 16:05:42 -05001961 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001962 for (p = debugfs_entries; p->name; ++p)
Hollis Blanchard76f7c872008-04-15 16:05:42 -05001963 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
Avi Kivity1165f5f2007-04-19 17:27:43 +03001964 (void *)(long)p->offset,
Avi Kivityba1389b2007-11-18 16:24:12 +02001965 stat_fops[p->kind]);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001966}
1967
1968static void kvm_exit_debug(void)
1969{
1970 struct kvm_stats_debugfs_item *p;
1971
1972 for (p = debugfs_entries; p->name; ++p)
1973 debugfs_remove(p->dentry);
Hollis Blanchard76f7c872008-04-15 16:05:42 -05001974 debugfs_remove(kvm_debugfs_dir);
Avi Kivity6aa8b732006-12-10 02:21:36 -08001975}
1976
Avi Kivity59ae6c62007-02-12 00:54:48 -08001977static int kvm_suspend(struct sys_device *dev, pm_message_t state)
1978{
Avi Kivity4267c412007-05-24 13:09:41 +03001979 hardware_disable(NULL);
Avi Kivity59ae6c62007-02-12 00:54:48 -08001980 return 0;
1981}
1982
1983static int kvm_resume(struct sys_device *dev)
1984{
Avi Kivity4267c412007-05-24 13:09:41 +03001985 hardware_enable(NULL);
Avi Kivity59ae6c62007-02-12 00:54:48 -08001986 return 0;
1987}
1988
1989static struct sysdev_class kvm_sysdev_class = {
Kay Sieversaf5ca3f2007-12-20 02:09:39 +01001990 .name = "kvm",
Avi Kivity59ae6c62007-02-12 00:54:48 -08001991 .suspend = kvm_suspend,
1992 .resume = kvm_resume,
1993};
1994
1995static struct sys_device kvm_sysdev = {
1996 .id = 0,
1997 .cls = &kvm_sysdev_class,
1998};
1999
Izik Eiduscea7bb22007-10-17 19:17:48 +02002000struct page *bad_page;
Anthony Liguori35149e22008-04-02 14:46:56 -05002001pfn_t bad_pfn;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002002
Avi Kivity15ad7142007-07-11 18:17:21 +03002003static inline
2004struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2005{
2006 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2007}
2008
2009static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2010{
2011 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2012
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002013 kvm_arch_vcpu_load(vcpu, cpu);
Avi Kivity15ad7142007-07-11 18:17:21 +03002014}
2015
2016static void kvm_sched_out(struct preempt_notifier *pn,
2017 struct task_struct *next)
2018{
2019 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2020
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002021 kvm_arch_vcpu_put(vcpu);
Avi Kivity15ad7142007-07-11 18:17:21 +03002022}
2023
Zhang Xiantaof8c16bb2007-11-14 20:40:21 +08002024int kvm_init(void *opaque, unsigned int vcpu_size,
Rusty Russellc16f8622007-07-30 21:12:19 +10002025 struct module *module)
Avi Kivity6aa8b732006-12-10 02:21:36 -08002026{
2027 int r;
Yang, Sheng002c7f72007-07-31 14:23:01 +03002028 int cpu;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002029
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002030 kvm_init_debug();
2031
Zhang Xiantaof8c16bb2007-11-14 20:40:21 +08002032 r = kvm_arch_init(opaque);
2033 if (r)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002034 goto out_fail;
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002035
2036 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2037
2038 if (bad_page == NULL) {
2039 r = -ENOMEM;
2040 goto out;
2041 }
2042
Anthony Liguori35149e22008-04-02 14:46:56 -05002043 bad_pfn = page_to_pfn(bad_page);
2044
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002045 r = kvm_arch_hardware_setup();
Avi Kivity6aa8b732006-12-10 02:21:36 -08002046 if (r < 0)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002047 goto out_free_0;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002048
Yang, Sheng002c7f72007-07-31 14:23:01 +03002049 for_each_online_cpu(cpu) {
2050 smp_call_function_single(cpu,
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002051 kvm_arch_check_processor_compat,
Jens Axboe8691e5a2008-06-06 11:18:06 +02002052 &r, 1);
Yang, Sheng002c7f72007-07-31 14:23:01 +03002053 if (r < 0)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002054 goto out_free_1;
Yang, Sheng002c7f72007-07-31 14:23:01 +03002055 }
2056
Jens Axboe15c8b6c2008-05-09 09:39:44 +02002057 on_each_cpu(hardware_enable, NULL, 1);
Avi Kivity774c47f2007-02-12 00:54:47 -08002058 r = register_cpu_notifier(&kvm_cpu_notifier);
2059 if (r)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002060 goto out_free_2;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002061 register_reboot_notifier(&kvm_reboot_notifier);
2062
Avi Kivity59ae6c62007-02-12 00:54:48 -08002063 r = sysdev_class_register(&kvm_sysdev_class);
2064 if (r)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002065 goto out_free_3;
Avi Kivity59ae6c62007-02-12 00:54:48 -08002066
2067 r = sysdev_register(&kvm_sysdev);
2068 if (r)
Zhang Xiantaod23087842007-11-29 15:35:39 +08002069 goto out_free_4;
Avi Kivity59ae6c62007-02-12 00:54:48 -08002070
Rusty Russellc16f8622007-07-30 21:12:19 +10002071 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2072 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
Joe Perches56919c52007-11-12 20:06:51 -08002073 __alignof__(struct kvm_vcpu),
2074 0, NULL);
Rusty Russellc16f8622007-07-30 21:12:19 +10002075 if (!kvm_vcpu_cache) {
2076 r = -ENOMEM;
Zhang Xiantaod23087842007-11-29 15:35:39 +08002077 goto out_free_5;
Rusty Russellc16f8622007-07-30 21:12:19 +10002078 }
2079
Avi Kivity6aa8b732006-12-10 02:21:36 -08002080 kvm_chardev_ops.owner = module;
2081
2082 r = misc_register(&kvm_dev);
2083 if (r) {
Mike Dayd77c26f2007-10-08 09:02:08 -04002084 printk(KERN_ERR "kvm: misc device register failed\n");
Avi Kivity6aa8b732006-12-10 02:21:36 -08002085 goto out_free;
2086 }
2087
Avi Kivity15ad7142007-07-11 18:17:21 +03002088 kvm_preempt_ops.sched_in = kvm_sched_in;
2089 kvm_preempt_ops.sched_out = kvm_sched_out;
2090
Avi Kivityc7addb92007-09-16 18:58:32 +02002091 return 0;
Avi Kivity6aa8b732006-12-10 02:21:36 -08002092
2093out_free:
Rusty Russellc16f8622007-07-30 21:12:19 +10002094 kmem_cache_destroy(kvm_vcpu_cache);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002095out_free_5:
Avi Kivity59ae6c62007-02-12 00:54:48 -08002096 sysdev_unregister(&kvm_sysdev);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002097out_free_4:
Avi Kivity59ae6c62007-02-12 00:54:48 -08002098 sysdev_class_unregister(&kvm_sysdev_class);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002099out_free_3:
Avi Kivity6aa8b732006-12-10 02:21:36 -08002100 unregister_reboot_notifier(&kvm_reboot_notifier);
Avi Kivity774c47f2007-02-12 00:54:47 -08002101 unregister_cpu_notifier(&kvm_cpu_notifier);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002102out_free_2:
Jens Axboe15c8b6c2008-05-09 09:39:44 +02002103 on_each_cpu(hardware_disable, NULL, 1);
Zhang Xiantaod23087842007-11-29 15:35:39 +08002104out_free_1:
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002105 kvm_arch_hardware_unsetup();
Zhang Xiantaod23087842007-11-29 15:35:39 +08002106out_free_0:
2107 __free_page(bad_page);
Avi Kivityca45aaa2007-03-01 19:21:03 +02002108out:
Zhang Xiantaof8c16bb2007-11-14 20:40:21 +08002109 kvm_arch_exit();
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002110 kvm_exit_debug();
Zhang Xiantaod23087842007-11-29 15:35:39 +08002111out_fail:
Avi Kivity6aa8b732006-12-10 02:21:36 -08002112 return r;
2113}
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002114EXPORT_SYMBOL_GPL(kvm_init);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002115
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002116void kvm_exit(void)
Avi Kivity6aa8b732006-12-10 02:21:36 -08002117{
Feng(Eric) Liud4c9ff22008-04-10 08:47:53 -04002118 kvm_trace_cleanup();
Avi Kivity6aa8b732006-12-10 02:21:36 -08002119 misc_deregister(&kvm_dev);
Rusty Russellc16f8622007-07-30 21:12:19 +10002120 kmem_cache_destroy(kvm_vcpu_cache);
Avi Kivity59ae6c62007-02-12 00:54:48 -08002121 sysdev_unregister(&kvm_sysdev);
2122 sysdev_class_unregister(&kvm_sysdev_class);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002123 unregister_reboot_notifier(&kvm_reboot_notifier);
Avi Kivity59ae6c62007-02-12 00:54:48 -08002124 unregister_cpu_notifier(&kvm_cpu_notifier);
Jens Axboe15c8b6c2008-05-09 09:39:44 +02002125 on_each_cpu(hardware_disable, NULL, 1);
Zhang Xiantaoe9b11c12007-11-14 20:38:21 +08002126 kvm_arch_hardware_unsetup();
Zhang Xiantaof8c16bb2007-11-14 20:40:21 +08002127 kvm_arch_exit();
Avi Kivity6aa8b732006-12-10 02:21:36 -08002128 kvm_exit_debug();
Izik Eiduscea7bb22007-10-17 19:17:48 +02002129 __free_page(bad_page);
Avi Kivity6aa8b732006-12-10 02:21:36 -08002130}
Zhang Xiantaocb498ea2007-11-14 20:39:31 +08002131EXPORT_SYMBOL_GPL(kvm_exit);