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KVM: Simplify decode_register_operand() calling convention
[deliverable/linux.git] / drivers / kvm / kvm_main.c
CommitLineData
6aa8b732
AK		 1/*
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
18#include "kvm.h"
043405e1 19#include "x86.h"
e495606d 20#include "x86_emulate.h"
85f455f7 21#include "irq.h"
6aa8b732
AK		 22
23#include <linux/kvm.h>
24#include <linux/module.h>
25#include <linux/errno.h>
6aa8b732
AK		 26#include <linux/percpu.h>
27#include <linux/gfp.h>
6aa8b732
AK		 28#include <linux/mm.h>
29#include <linux/miscdevice.h>
30#include <linux/vmalloc.h>
6aa8b732 31#include <linux/reboot.h>
6aa8b732
AK		 32#include <linux/debugfs.h>
33#include <linux/highmem.h>
34#include <linux/file.h>
59ae6c6b 35#include <linux/sysdev.h>
774c47f1 36#include <linux/cpu.h>
e8edc6e0 37#include <linux/sched.h>
d9e368d6
AK		 38#include <linux/cpumask.h>
39#include <linux/smp.h>
d6d28168 40#include <linux/anon_inodes.h>
04d2cc77 41#include <linux/profile.h>
7aa81cc0 42#include <linux/kvm_para.h>
6fc138d2 43#include <linux/pagemap.h>
8d4e1288 44#include <linux/mman.h>
6aa8b732 45
e495606d
AK		 46#include <asm/processor.h>
47#include <asm/msr.h>
48#include <asm/io.h>
49#include <asm/uaccess.h>
50#include <asm/desc.h>
6aa8b732
AK		 51
52MODULE_AUTHOR("Qumranet");
53MODULE_LICENSE("GPL");
54
133de902
AK		 55static DEFINE_SPINLOCK(kvm_lock);
56static LIST_HEAD(vm_list);
57
1b6c0168
AK		 58static cpumask_t cpus_hardware_enabled;
59
cbdd1bea 60struct kvm_x86_ops *kvm_x86_ops;
c16f862d
RR		 61struct kmem_cache *kvm_vcpu_cache;
62EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
1165f5fe 63
15ad7146
AK		 64static __read_mostly struct preempt_ops kvm_preempt_ops;
65
1165f5fe 66#define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
6aa8b732
AK		 67
68static struct kvm_stats_debugfs_item {
69 const char *name;
1165f5fe 70 int offset;
6aa8b732
AK		 71 struct dentry *dentry;
72} debugfs_entries[] = {
1165f5fe
AK		 73 { "pf_fixed", STAT_OFFSET(pf_fixed) },
74 { "pf_guest", STAT_OFFSET(pf_guest) },
75 { "tlb_flush", STAT_OFFSET(tlb_flush) },
76 { "invlpg", STAT_OFFSET(invlpg) },
77 { "exits", STAT_OFFSET(exits) },
78 { "io_exits", STAT_OFFSET(io_exits) },
79 { "mmio_exits", STAT_OFFSET(mmio_exits) },
80 { "signal_exits", STAT_OFFSET(signal_exits) },
81 { "irq_window", STAT_OFFSET(irq_window_exits) },
82 { "halt_exits", STAT_OFFSET(halt_exits) },
b6958ce4 83 { "halt_wakeup", STAT_OFFSET(halt_wakeup) },
1165f5fe
AK		 84 { "request_irq", STAT_OFFSET(request_irq_exits) },
85 { "irq_exits", STAT_OFFSET(irq_exits) },
e6adf283 86 { "light_exits", STAT_OFFSET(light_exits) },
2cc51560 87 { "efer_reload", STAT_OFFSET(efer_reload) },
1165f5fe 88 { NULL }
6aa8b732
AK		 89};
90
91static struct dentry *debugfs_dir;
92
bccf2150
AK		 93static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
94 unsigned long arg);
95
5aacf0ca
JM		 96static inline int valid_vcpu(int n)
97{
98 return likely(n >= 0 && n < KVM_MAX_VCPUS);
99}
100
7702fd1f
AK		 101void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
102{
103 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
104 return;
105
106 vcpu->guest_fpu_loaded = 1;
b114b080
RR		 107 fx_save(&vcpu->host_fx_image);
108 fx_restore(&vcpu->guest_fx_image);
7702fd1f
AK		 109}
110EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
111
112void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
113{
114 if (!vcpu->guest_fpu_loaded)
115 return;
116
117 vcpu->guest_fpu_loaded = 0;
b114b080
RR		 118 fx_save(&vcpu->guest_fx_image);
119 fx_restore(&vcpu->host_fx_image);
7702fd1f
AK		 120}
121EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
122
bccf2150
AK		 123/*
124 * Switches to specified vcpu, until a matching vcpu_put()
125 */
313a3dc7 126void vcpu_load(struct kvm_vcpu *vcpu)
6aa8b732 127{
15ad7146
AK		 128 int cpu;
129
bccf2150 130 mutex_lock(&vcpu->mutex);
15ad7146
AK		 131 cpu = get_cpu();
132 preempt_notifier_register(&vcpu->preempt_notifier);
313a3dc7 133 kvm_arch_vcpu_load(vcpu, cpu);
15ad7146 134 put_cpu();
6aa8b732
AK		 135}
136
313a3dc7 137void vcpu_put(struct kvm_vcpu *vcpu)
6aa8b732 138{
15ad7146 139 preempt_disable();
313a3dc7 140 kvm_arch_vcpu_put(vcpu);
15ad7146
AK		 141 preempt_notifier_unregister(&vcpu->preempt_notifier);
142 preempt_enable();
6aa8b732
AK		 143 mutex_unlock(&vcpu->mutex);
144}
145
d9e368d6
AK		 146static void ack_flush(void *_completed)
147{
d9e368d6
AK		 148}
149
150void kvm_flush_remote_tlbs(struct kvm *kvm)
151{
49d3bd7e 152 int i, cpu;
d9e368d6
AK		 153 cpumask_t cpus;
154 struct kvm_vcpu *vcpu;
d9e368d6 155
d9e368d6 156 cpus_clear(cpus);
fb3f0f51
RR		 157 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
158 vcpu = kvm->vcpus[i];
159 if (!vcpu)
160 continue;
3176bc3e 161 if (test_and_set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
d9e368d6
AK		 162 continue;
163 cpu = vcpu->cpu;
164 if (cpu != -1 && cpu != raw_smp_processor_id())
49d3bd7e 165 cpu_set(cpu, cpus);
d9e368d6 166 }
49d3bd7e 167 smp_call_function_mask(cpus, ack_flush, NULL, 1);
d9e368d6
AK		 168}
169
fb3f0f51
RR		 170int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
171{
172 struct page *page;
173 int r;
174
175 mutex_init(&vcpu->mutex);
176 vcpu->cpu = -1;
177 vcpu->mmu.root_hpa = INVALID_PAGE;
178 vcpu->kvm = kvm;
179 vcpu->vcpu_id = id;
c5ec1534
HQ		 180 if (!irqchip_in_kernel(kvm) || id == 0)
181 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
182 else
183 vcpu->mp_state = VCPU_MP_STATE_UNINITIALIZED;
b6958ce4 184 init_waitqueue_head(&vcpu->wq);
fb3f0f51
RR		 185
186 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
187 if (!page) {
188 r = -ENOMEM;
189 goto fail;
190 }
191 vcpu->run = page_address(page);
192
193 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
194 if (!page) {
195 r = -ENOMEM;
196 goto fail_free_run;
197 }
198 vcpu->pio_data = page_address(page);
199
fb3f0f51
RR		 200 r = kvm_mmu_create(vcpu);
201 if (r < 0)
202 goto fail_free_pio_data;
203
76fafa5e
RR		 204 if (irqchip_in_kernel(kvm)) {
205 r = kvm_create_lapic(vcpu);
206 if (r < 0)
207 goto fail_mmu_destroy;
208 }
209
fb3f0f51
RR		 210 return 0;
211
76fafa5e
RR		 212fail_mmu_destroy:
213 kvm_mmu_destroy(vcpu);
fb3f0f51
RR		 214fail_free_pio_data:
215 free_page((unsigned long)vcpu->pio_data);
216fail_free_run:
217 free_page((unsigned long)vcpu->run);
218fail:
76fafa5e 219 return r;
fb3f0f51
RR		 220}
221EXPORT_SYMBOL_GPL(kvm_vcpu_init);
222
223void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
224{
d589444e 225 kvm_free_lapic(vcpu);
fb3f0f51
RR		 226 kvm_mmu_destroy(vcpu);
227 free_page((unsigned long)vcpu->pio_data);
228 free_page((unsigned long)vcpu->run);
229}
230EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
231
f17abe9a 232static struct kvm *kvm_create_vm(void)
6aa8b732
AK		 233{
234 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
6aa8b732
AK		 235
236 if (!kvm)
f17abe9a 237 return ERR_PTR(-ENOMEM);
6aa8b732 238
74906345 239 kvm_io_bus_init(&kvm->pio_bus);
11ec2804 240 mutex_init(&kvm->lock);
6aa8b732 241 INIT_LIST_HEAD(&kvm->active_mmu_pages);
2eeb2e94 242 kvm_io_bus_init(&kvm->mmio_bus);
5e58cfe4
RR		 243 spin_lock(&kvm_lock);
244 list_add(&kvm->vm_list, &vm_list);
245 spin_unlock(&kvm_lock);
f17abe9a
AK		 246 return kvm;
247}
248
6aa8b732
AK		 249/*
250 * Free any memory in @free but not in @dont.
251 */
252static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
253 struct kvm_memory_slot *dont)
254{
290fc38d
IE		 255 if (!dont || free->rmap != dont->rmap)
256 vfree(free->rmap);
6aa8b732
AK		 257
258 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
259 vfree(free->dirty_bitmap);
260
6aa8b732 261 free->npages = 0;
8b6d44c7 262 free->dirty_bitmap = NULL;
8d4e1288 263 free->rmap = NULL;
6aa8b732
AK		 264}
265
266static void kvm_free_physmem(struct kvm *kvm)
267{
268 int i;
269
270 for (i = 0; i < kvm->nmemslots; ++i)
8b6d44c7 271 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
6aa8b732
AK		 272}
273
7b53aa56
AK		 274static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
275{
7b53aa56
AK		 276 vcpu_load(vcpu);
277 kvm_mmu_unload(vcpu);
278 vcpu_put(vcpu);
279}
280
6aa8b732
AK		 281static void kvm_free_vcpus(struct kvm *kvm)
282{
283 unsigned int i;
284
7b53aa56
AK		 285 /*
286 * Unpin any mmu pages first.
287 */
288 for (i = 0; i < KVM_MAX_VCPUS; ++i)
fb3f0f51
RR		 289 if (kvm->vcpus[i])
290 kvm_unload_vcpu_mmu(kvm->vcpus[i]);
291 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
292 if (kvm->vcpus[i]) {
cbdd1bea 293 kvm_x86_ops->vcpu_free(kvm->vcpus[i]);
fb3f0f51
RR		 294 kvm->vcpus[i] = NULL;
295 }
296 }
297
6aa8b732
AK		 298}
299
f17abe9a
AK		 300static void kvm_destroy_vm(struct kvm *kvm)
301{
133de902
AK		 302 spin_lock(&kvm_lock);
303 list_del(&kvm->vm_list);
304 spin_unlock(&kvm_lock);
74906345 305 kvm_io_bus_destroy(&kvm->pio_bus);
2eeb2e94 306 kvm_io_bus_destroy(&kvm->mmio_bus);
85f455f7 307 kfree(kvm->vpic);
1fd4f2a5 308 kfree(kvm->vioapic);
6aa8b732
AK		 309 kvm_free_vcpus(kvm);
310 kvm_free_physmem(kvm);
311 kfree(kvm);
f17abe9a
AK		 312}
313
314static int kvm_vm_release(struct inode *inode, struct file *filp)
315{
316 struct kvm *kvm = filp->private_data;
317
318 kvm_destroy_vm(kvm);
6aa8b732
AK		 319 return 0;
320}
321
6aa8b732
AK		 322void fx_init(struct kvm_vcpu *vcpu)
323{
b114b080 324 unsigned after_mxcsr_mask;
6aa8b732 325
9bd01506
RR		 326 /* Initialize guest FPU by resetting ours and saving into guest's */
327 preempt_disable();
b114b080 328 fx_save(&vcpu->host_fx_image);
6aa8b732 329 fpu_init();
b114b080
RR		 330 fx_save(&vcpu->guest_fx_image);
331 fx_restore(&vcpu->host_fx_image);
9bd01506 332 preempt_enable();
6aa8b732 333
380102c8 334 vcpu->cr0 |= X86_CR0_ET;
b114b080
RR		 335 after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
336 vcpu->guest_fx_image.mxcsr = 0x1f80;
337 memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask,
338 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
6aa8b732
AK		 339}
340EXPORT_SYMBOL_GPL(fx_init);
341
6aa8b732
AK		 342/*
343 * Allocate some memory and give it an address in the guest physical address
344 * space.
345 *
346 * Discontiguous memory is allowed, mostly for framebuffers.
f78e0e2e
SY		 347 *
348 * Must be called holding kvm->lock.
6aa8b732 349 */
f78e0e2e
SY		 350int __kvm_set_memory_region(struct kvm *kvm,
351 struct kvm_userspace_memory_region *mem,
352 int user_alloc)
6aa8b732
AK		 353{
354 int r;
355 gfn_t base_gfn;
356 unsigned long npages;
357 unsigned long i;
358 struct kvm_memory_slot *memslot;
359 struct kvm_memory_slot old, new;
6aa8b732
AK		 360
361 r = -EINVAL;
362 /* General sanity checks */
363 if (mem->memory_size & (PAGE_SIZE - 1))
364 goto out;
365 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
366 goto out;
e0d62c7f 367 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
6aa8b732
AK		 368 goto out;
369 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
370 goto out;
371
372 memslot = &kvm->memslots[mem->slot];
373 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
374 npages = mem->memory_size >> PAGE_SHIFT;
375
376 if (!npages)
377 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
378
6aa8b732
AK		 379 new = old = *memslot;
380
381 new.base_gfn = base_gfn;
382 new.npages = npages;
383 new.flags = mem->flags;
384
385 /* Disallow changing a memory slot's size. */
386 r = -EINVAL;
387 if (npages && old.npages && npages != old.npages)
f78e0e2e 388 goto out_free;
6aa8b732
AK		 389
390 /* Check for overlaps */
391 r = -EEXIST;
392 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
393 struct kvm_memory_slot *s = &kvm->memslots[i];
394
395 if (s == memslot)
396 continue;
397 if (!((base_gfn + npages <= s->base_gfn) ||
398 (base_gfn >= s->base_gfn + s->npages)))
f78e0e2e 399 goto out_free;
6aa8b732 400 }
6aa8b732 401
6aa8b732
AK		 402 /* Free page dirty bitmap if unneeded */
403 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
8b6d44c7 404 new.dirty_bitmap = NULL;
6aa8b732
AK		 405
406 r = -ENOMEM;
407
408 /* Allocate if a slot is being created */
8d4e1288 409 if (npages && !new.rmap) {
d77c26fc 410 new.rmap = vmalloc(npages * sizeof(struct page *));
290fc38d
IE		 411
412 if (!new.rmap)
f78e0e2e 413 goto out_free;
290fc38d 414
290fc38d 415 memset(new.rmap, 0, npages * sizeof(*new.rmap));
8d4e1288 416
80b14b5b 417 new.user_alloc = user_alloc;
8d4e1288 418 if (user_alloc)
8a7ae055 419 new.userspace_addr = mem->userspace_addr;
8d4e1288
AL		 420 else {
421 down_write(&current->mm->mmap_sem);
422 new.userspace_addr = do_mmap(NULL, 0,
423 npages * PAGE_SIZE,
424 PROT_READ | PROT_WRITE,
425 MAP_SHARED | MAP_ANONYMOUS,
426 0);
427 up_write(&current->mm->mmap_sem);
428
429 if (IS_ERR((void *)new.userspace_addr))
f78e0e2e 430 goto out_free;
6aa8b732 431 }
80b14b5b
IE		 432 } else {
433 if (!old.user_alloc && old.rmap) {
434 int ret;
435
436 down_write(&current->mm->mmap_sem);
437 ret = do_munmap(current->mm, old.userspace_addr,
438 old.npages * PAGE_SIZE);
439 up_write(&current->mm->mmap_sem);
440 if (ret < 0)
441 printk(KERN_WARNING
442 "kvm_vm_ioctl_set_memory_region: "
443 "failed to munmap memory\n");
444 }
6aa8b732
AK		 445 }
446
447 /* Allocate page dirty bitmap if needed */
448 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
449 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
450
451 new.dirty_bitmap = vmalloc(dirty_bytes);
452 if (!new.dirty_bitmap)
f78e0e2e 453 goto out_free;
6aa8b732
AK		 454 memset(new.dirty_bitmap, 0, dirty_bytes);
455 }
456
6aa8b732
AK		 457 if (mem->slot >= kvm->nmemslots)
458 kvm->nmemslots = mem->slot + 1;
459
82ce2c96
IE		 460 if (!kvm->n_requested_mmu_pages) {
461 unsigned int n_pages;
462
463 if (npages) {
464 n_pages = npages * KVM_PERMILLE_MMU_PAGES / 1000;
465 kvm_mmu_change_mmu_pages(kvm, kvm->n_alloc_mmu_pages +
466 n_pages);
467 } else {
468 unsigned int nr_mmu_pages;
469
470 n_pages = old.npages * KVM_PERMILLE_MMU_PAGES / 1000;
471 nr_mmu_pages = kvm->n_alloc_mmu_pages - n_pages;
472 nr_mmu_pages = max(nr_mmu_pages,
473 (unsigned int) KVM_MIN_ALLOC_MMU_PAGES);
474 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
475 }
476 }
477
6aa8b732 478 *memslot = new;
6aa8b732 479
90cb0529
AK		 480 kvm_mmu_slot_remove_write_access(kvm, mem->slot);
481 kvm_flush_remote_tlbs(kvm);
6aa8b732 482
6aa8b732
AK		 483 kvm_free_physmem_slot(&old, &new);
484 return 0;
485
f78e0e2e 486out_free:
6aa8b732
AK		 487 kvm_free_physmem_slot(&new, &old);
488out:
489 return r;
210c7c4d
IE		 490
491}
f78e0e2e
SY		 492EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
493
494int kvm_set_memory_region(struct kvm *kvm,
495 struct kvm_userspace_memory_region *mem,
496 int user_alloc)
497{
498 int r;
499
500 mutex_lock(&kvm->lock);
501 r = __kvm_set_memory_region(kvm, mem, user_alloc);
502 mutex_unlock(&kvm->lock);
503 return r;
504}
210c7c4d
IE		 505EXPORT_SYMBOL_GPL(kvm_set_memory_region);
506
1fe779f8
CO		 507int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
508 struct
509 kvm_userspace_memory_region *mem,
510 int user_alloc)
210c7c4d 511{
e0d62c7f
IE		 512 if (mem->slot >= KVM_MEMORY_SLOTS)
513 return -EINVAL;
210c7c4d 514 return kvm_set_memory_region(kvm, mem, user_alloc);
6aa8b732
AK		 515}
516
517/*
518 * Get (and clear) the dirty memory log for a memory slot.
519 */
2c6f5df9
AK		 520static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
521 struct kvm_dirty_log *log)
6aa8b732
AK		 522{
523 struct kvm_memory_slot *memslot;
524 int r, i;
525 int n;
526 unsigned long any = 0;
527
11ec2804 528 mutex_lock(&kvm->lock);
6aa8b732 529
6aa8b732
AK		 530 r = -EINVAL;
531 if (log->slot >= KVM_MEMORY_SLOTS)
532 goto out;
533
534 memslot = &kvm->memslots[log->slot];
535 r = -ENOENT;
536 if (!memslot->dirty_bitmap)
537 goto out;
538
cd1a4a98 539 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
6aa8b732 540
cd1a4a98 541 for (i = 0; !any && i < n/sizeof(long); ++i)
6aa8b732
AK		 542 any = memslot->dirty_bitmap[i];
543
544 r = -EFAULT;
545 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
546 goto out;
547
39214915
RR		 548 /* If nothing is dirty, don't bother messing with page tables. */
549 if (any) {
39214915
RR		 550 kvm_mmu_slot_remove_write_access(kvm, log->slot);
551 kvm_flush_remote_tlbs(kvm);
552 memset(memslot->dirty_bitmap, 0, n);
39214915 553 }
6aa8b732
AK		 554
555 r = 0;
556
557out:
11ec2804 558 mutex_unlock(&kvm->lock);
6aa8b732
AK		 559 return r;
560}
561
cea7bb21
IE		 562int is_error_page(struct page *page)
563{
564 return page == bad_page;
565}
566EXPORT_SYMBOL_GPL(is_error_page);
567
290fc38d 568gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
e8207547
AK		 569{
570 int i;
571 struct kvm_mem_alias *alias;
572
573 for (i = 0; i < kvm->naliases; ++i) {
574 alias = &kvm->aliases[i];
575 if (gfn >= alias->base_gfn
576 && gfn < alias->base_gfn + alias->npages)
577 return alias->target_gfn + gfn - alias->base_gfn;
578 }
579 return gfn;
580}
581
582static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
6aa8b732
AK		 583{
584 int i;
585
586 for (i = 0; i < kvm->nmemslots; ++i) {
587 struct kvm_memory_slot *memslot = &kvm->memslots[i];
588
589 if (gfn >= memslot->base_gfn
590 && gfn < memslot->base_gfn + memslot->npages)
591 return memslot;
592 }
8b6d44c7 593 return NULL;
6aa8b732 594}
e8207547
AK		 595
596struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
597{
598 gfn = unalias_gfn(kvm, gfn);
599 return __gfn_to_memslot(kvm, gfn);
600}
6aa8b732 601
e0d62c7f
IE		 602int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
603{
604 int i;
605
606 gfn = unalias_gfn(kvm, gfn);
607 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
608 struct kvm_memory_slot *memslot = &kvm->memslots[i];
609
610 if (gfn >= memslot->base_gfn
611 && gfn < memslot->base_gfn + memslot->npages)
612 return 1;
613 }
614 return 0;
615}
616EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
617
aab61cc0
AL		 618/*
619 * Requires current->mm->mmap_sem to be held
620 */
621static struct page *__gfn_to_page(struct kvm *kvm, gfn_t gfn)
954bbbc2
AK		 622{
623 struct kvm_memory_slot *slot;
8d4e1288
AL		 624 struct page *page[1];
625 int npages;
954bbbc2 626
60395224
AK		 627 might_sleep();
628
e8207547
AK		 629 gfn = unalias_gfn(kvm, gfn);
630 slot = __gfn_to_memslot(kvm, gfn);
8a7ae055
IE		 631 if (!slot) {
632 get_page(bad_page);
cea7bb21 633 return bad_page;
8a7ae055 634 }
8d4e1288 635
8d4e1288
AL		 636 npages = get_user_pages(current, current->mm,
637 slot->userspace_addr
638 + (gfn - slot->base_gfn) * PAGE_SIZE, 1,
639 1, 1, page, NULL);
8d4e1288
AL		 640 if (npages != 1) {
641 get_page(bad_page);
642 return bad_page;
8a7ae055 643 }
8d4e1288
AL		 644
645 return page[0];
954bbbc2 646}
aab61cc0
AL		 647
648struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
649{
650 struct page *page;
651
652 down_read(&current->mm->mmap_sem);
653 page = __gfn_to_page(kvm, gfn);
654 up_read(&current->mm->mmap_sem);
655
656 return page;
657}
658
954bbbc2
AK		 659EXPORT_SYMBOL_GPL(gfn_to_page);
660
8a7ae055
IE		 661void kvm_release_page(struct page *page)
662{
663 if (!PageReserved(page))
664 SetPageDirty(page);
665 put_page(page);
666}
667EXPORT_SYMBOL_GPL(kvm_release_page);
668
195aefde
IE		 669static int next_segment(unsigned long len, int offset)
670{
671 if (len > PAGE_SIZE - offset)
672 return PAGE_SIZE - offset;
673 else
674 return len;
675}
676
677int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
678 int len)
679{
680 void *page_virt;
681 struct page *page;
682
683 page = gfn_to_page(kvm, gfn);
8a7ae055
IE		 684 if (is_error_page(page)) {
685 kvm_release_page(page);
195aefde 686 return -EFAULT;
8a7ae055 687 }
195aefde
IE		 688 page_virt = kmap_atomic(page, KM_USER0);
689
690 memcpy(data, page_virt + offset, len);
691
692 kunmap_atomic(page_virt, KM_USER0);
8a7ae055 693 kvm_release_page(page);
195aefde
IE		 694 return 0;
695}
696EXPORT_SYMBOL_GPL(kvm_read_guest_page);
697
698int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
699{
700 gfn_t gfn = gpa >> PAGE_SHIFT;
701 int seg;
702 int offset = offset_in_page(gpa);
703 int ret;
704
705 while ((seg = next_segment(len, offset)) != 0) {
706 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
707 if (ret < 0)
708 return ret;
709 offset = 0;
710 len -= seg;
711 data += seg;
712 ++gfn;
713 }
714 return 0;
715}
716EXPORT_SYMBOL_GPL(kvm_read_guest);
717
718int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
719 int offset, int len)
720{
721 void *page_virt;
722 struct page *page;
723
724 page = gfn_to_page(kvm, gfn);
8a7ae055
IE		 725 if (is_error_page(page)) {
726 kvm_release_page(page);
195aefde 727 return -EFAULT;
8a7ae055 728 }
195aefde
IE		 729 page_virt = kmap_atomic(page, KM_USER0);
730
731 memcpy(page_virt + offset, data, len);
732
733 kunmap_atomic(page_virt, KM_USER0);
734 mark_page_dirty(kvm, gfn);
8a7ae055 735 kvm_release_page(page);
195aefde
IE		 736 return 0;
737}
738EXPORT_SYMBOL_GPL(kvm_write_guest_page);
739
740int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
741 unsigned long len)
742{
743 gfn_t gfn = gpa >> PAGE_SHIFT;
744 int seg;
745 int offset = offset_in_page(gpa);
746 int ret;
747
748 while ((seg = next_segment(len, offset)) != 0) {
749 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
750 if (ret < 0)
751 return ret;
752 offset = 0;
753 len -= seg;
754 data += seg;
755 ++gfn;
756 }
757 return 0;
758}
759
760int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
761{
762 void *page_virt;
763 struct page *page;
764
765 page = gfn_to_page(kvm, gfn);
8a7ae055
IE		 766 if (is_error_page(page)) {
767 kvm_release_page(page);
195aefde 768 return -EFAULT;
8a7ae055 769 }
195aefde
IE		 770 page_virt = kmap_atomic(page, KM_USER0);
771
772 memset(page_virt + offset, 0, len);
773
774 kunmap_atomic(page_virt, KM_USER0);
8a7ae055 775 kvm_release_page(page);
195aefde
IE		 776 return 0;
777}
778EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
779
780int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
781{
782 gfn_t gfn = gpa >> PAGE_SHIFT;
783 int seg;
784 int offset = offset_in_page(gpa);
785 int ret;
786
787 while ((seg = next_segment(len, offset)) != 0) {
788 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
789 if (ret < 0)
790 return ret;
791 offset = 0;
792 len -= seg;
793 ++gfn;
794 }
795 return 0;
796}
797EXPORT_SYMBOL_GPL(kvm_clear_guest);
798
7e9d619d 799/* WARNING: Does not work on aliased pages. */
6aa8b732
AK		 800void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
801{
31389947 802 struct kvm_memory_slot *memslot;
6aa8b732 803
7e9d619d
RR		 804 memslot = __gfn_to_memslot(kvm, gfn);
805 if (memslot && memslot->dirty_bitmap) {
806 unsigned long rel_gfn = gfn - memslot->base_gfn;
6aa8b732 807
7e9d619d
RR		 808 /* avoid RMW */
809 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
810 set_bit(rel_gfn, memslot->dirty_bitmap);
6aa8b732
AK		 811 }
812}
813
b6958ce4
ED		 814/*
815 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
816 */
c5ec1534 817static void kvm_vcpu_block(struct kvm_vcpu *vcpu)
d3bef15f 818{
b6958ce4
ED		 819 DECLARE_WAITQUEUE(wait, current);
820
821 add_wait_queue(&vcpu->wq, &wait);
822
823 /*
824 * We will block until either an interrupt or a signal wakes us up
825 */
c5ec1534
HQ		 826 while (!kvm_cpu_has_interrupt(vcpu)
827 && !signal_pending(current)
828 && vcpu->mp_state != VCPU_MP_STATE_RUNNABLE
829 && vcpu->mp_state != VCPU_MP_STATE_SIPI_RECEIVED) {
b6958ce4
ED		 830 set_current_state(TASK_INTERRUPTIBLE);
831 vcpu_put(vcpu);
832 schedule();
833 vcpu_load(vcpu);
834 }
d3bef15f 835
c5ec1534 836 __set_current_state(TASK_RUNNING);
b6958ce4 837 remove_wait_queue(&vcpu->wq, &wait);
b6958ce4
ED		 838}
839
840int kvm_emulate_halt(struct kvm_vcpu *vcpu)
841{
d3bef15f 842 ++vcpu->stat.halt_exits;
b6958ce4 843 if (irqchip_in_kernel(vcpu->kvm)) {
c5ec1534
HQ		 844 vcpu->mp_state = VCPU_MP_STATE_HALTED;
845 kvm_vcpu_block(vcpu);
846 if (vcpu->mp_state != VCPU_MP_STATE_RUNNABLE)
847 return -EINTR;
b6958ce4
ED		 848 return 1;
849 } else {
850 vcpu->run->exit_reason = KVM_EXIT_HLT;
851 return 0;
852 }
d3bef15f
AK		 853}
854EXPORT_SYMBOL_GPL(kvm_emulate_halt);
855
7aa81cc0 856int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
270fd9b9 857{
7aa81cc0 858 unsigned long nr, a0, a1, a2, a3, ret;
270fd9b9 859
cbdd1bea 860 kvm_x86_ops->cache_regs(vcpu);
7aa81cc0
AL		 861
862 nr = vcpu->regs[VCPU_REGS_RAX];
863 a0 = vcpu->regs[VCPU_REGS_RBX];
864 a1 = vcpu->regs[VCPU_REGS_RCX];
865 a2 = vcpu->regs[VCPU_REGS_RDX];
866 a3 = vcpu->regs[VCPU_REGS_RSI];
867
868 if (!is_long_mode(vcpu)) {
869 nr &= 0xFFFFFFFF;
870 a0 &= 0xFFFFFFFF;
871 a1 &= 0xFFFFFFFF;
872 a2 &= 0xFFFFFFFF;
873 a3 &= 0xFFFFFFFF;
270fd9b9 874 }
7aa81cc0 875
270fd9b9
AK		 876 switch (nr) {
877 default:
7aa81cc0
AL		 878 ret = -KVM_ENOSYS;
879 break;
270fd9b9
AK		 880 }
881 vcpu->regs[VCPU_REGS_RAX] = ret;
cbdd1bea 882 kvm_x86_ops->decache_regs(vcpu);
7aa81cc0
AL		 883 return 0;
884}
885EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
886
887int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
888{
889 char instruction[3];
890 int ret = 0;
891
892 mutex_lock(&vcpu->kvm->lock);
893
894 /*
895 * Blow out the MMU to ensure that no other VCPU has an active mapping
896 * to ensure that the updated hypercall appears atomically across all
897 * VCPUs.
898 */
899 kvm_mmu_zap_all(vcpu->kvm);
900
901 kvm_x86_ops->cache_regs(vcpu);
902 kvm_x86_ops->patch_hypercall(vcpu, instruction);
903 if (emulator_write_emulated(vcpu->rip, instruction, 3, vcpu)
904 != X86EMUL_CONTINUE)
905 ret = -EFAULT;
906
907 mutex_unlock(&vcpu->kvm->lock);
908
909 return ret;
270fd9b9 910}
270fd9b9 911
6aa8b732
AK		 912static u64 mk_cr_64(u64 curr_cr, u32 new_val)
913{
914 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
915}
916
917void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
918{
919 struct descriptor_table dt = { limit, base };
920
cbdd1bea 921 kvm_x86_ops->set_gdt(vcpu, &dt);
6aa8b732
AK		 922}
923
924void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
925{
926 struct descriptor_table dt = { limit, base };
927
cbdd1bea 928 kvm_x86_ops->set_idt(vcpu, &dt);
6aa8b732
AK		 929}
930
931void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
932 unsigned long *rflags)
933{
934 lmsw(vcpu, msw);
cbdd1bea 935 *rflags = kvm_x86_ops->get_rflags(vcpu);
6aa8b732
AK		 936}
937
938unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
939{
cbdd1bea 940 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 941 switch (cr) {
942 case 0:
943 return vcpu->cr0;
944 case 2:
945 return vcpu->cr2;
946 case 3:
947 return vcpu->cr3;
948 case 4:
949 return vcpu->cr4;
950 default:
951 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
952 return 0;
953 }
954}
955
956void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
957 unsigned long *rflags)
958{
959 switch (cr) {
960 case 0:
961 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
cbdd1bea 962 *rflags = kvm_x86_ops->get_rflags(vcpu);
6aa8b732
AK		 963 break;
964 case 2:
965 vcpu->cr2 = val;
966 break;
967 case 3:
968 set_cr3(vcpu, val);
969 break;
970 case 4:
971 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
972 break;
973 default:
974 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
975 }
976}
977
6aa8b732
AK		 978void kvm_resched(struct kvm_vcpu *vcpu)
979{
3fca0365
YD		 980 if (!need_resched())
981 return;
6aa8b732 982 cond_resched();
6aa8b732
AK		 983}
984EXPORT_SYMBOL_GPL(kvm_resched);
985
06465c5a
AK		 986void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
987{
988 int i;
989 u32 function;
990 struct kvm_cpuid_entry *e, *best;
991
cbdd1bea 992 kvm_x86_ops->cache_regs(vcpu);
06465c5a
AK		 993 function = vcpu->regs[VCPU_REGS_RAX];
994 vcpu->regs[VCPU_REGS_RAX] = 0;
995 vcpu->regs[VCPU_REGS_RBX] = 0;
996 vcpu->regs[VCPU_REGS_RCX] = 0;
997 vcpu->regs[VCPU_REGS_RDX] = 0;
998 best = NULL;
999 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1000 e = &vcpu->cpuid_entries[i];
1001 if (e->function == function) {
1002 best = e;
1003 break;
1004 }
1005 /*
1006 * Both basic or both extended?
1007 */
1008 if (((e->function ^ function) & 0x80000000) == 0)
1009 if (!best || e->function > best->function)
1010 best = e;
1011 }
1012 if (best) {
1013 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1014 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1015 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1016 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1017 }
cbdd1bea
CE		 1018 kvm_x86_ops->decache_regs(vcpu);
1019 kvm_x86_ops->skip_emulated_instruction(vcpu);
06465c5a
AK		 1020}
1021EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1022
04d2cc77
AK		 1023/*
1024 * Check if userspace requested an interrupt window, and that the
1025 * interrupt window is open.
1026 *
1027 * No need to exit to userspace if we already have an interrupt queued.
1028 */
1029static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
1030 struct kvm_run *kvm_run)
1031{
1032 return (!vcpu->irq_summary &&
1033 kvm_run->request_interrupt_window &&
1034 vcpu->interrupt_window_open &&
1035 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
1036}
1037
1038static void post_kvm_run_save(struct kvm_vcpu *vcpu,
1039 struct kvm_run *kvm_run)
1040{
1041 kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
1042 kvm_run->cr8 = get_cr8(vcpu);
1043 kvm_run->apic_base = kvm_get_apic_base(vcpu);
1044 if (irqchip_in_kernel(vcpu->kvm))
1045 kvm_run->ready_for_interrupt_injection = 1;
1046 else
1047 kvm_run->ready_for_interrupt_injection =
1048 (vcpu->interrupt_window_open &&
1049 vcpu->irq_summary == 0);
1050}
1051
1052static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1053{
1054 int r;
1055
1056 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_SIPI_RECEIVED)) {
d77c26fc 1057 pr_debug("vcpu %d received sipi with vector # %x\n",
04d2cc77
AK		 1058 vcpu->vcpu_id, vcpu->sipi_vector);
1059 kvm_lapic_reset(vcpu);
e00c8cf2
AK		 1060 r = kvm_x86_ops->vcpu_reset(vcpu);
1061 if (r)
1062 return r;
04d2cc77
AK		 1063 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
1064 }
1065
1066preempted:
1067 if (vcpu->guest_debug.enabled)
1068 kvm_x86_ops->guest_debug_pre(vcpu);
1069
1070again:
1071 r = kvm_mmu_reload(vcpu);
1072 if (unlikely(r))
1073 goto out;
1074
ab6ef34b
AK		 1075 kvm_inject_pending_timer_irqs(vcpu);
1076
04d2cc77
AK		 1077 preempt_disable();
1078
1079 kvm_x86_ops->prepare_guest_switch(vcpu);
1080 kvm_load_guest_fpu(vcpu);
1081
1082 local_irq_disable();
1083
1084 if (signal_pending(current)) {
1085 local_irq_enable();
1086 preempt_enable();
1087 r = -EINTR;
1088 kvm_run->exit_reason = KVM_EXIT_INTR;
1089 ++vcpu->stat.signal_exits;
1090 goto out;
1091 }
1092
1093 if (irqchip_in_kernel(vcpu->kvm))
1094 kvm_x86_ops->inject_pending_irq(vcpu);
1095 else if (!vcpu->mmio_read_completed)
1096 kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);
1097
1098 vcpu->guest_mode = 1;
d172fcd3 1099 kvm_guest_enter();
04d2cc77
AK		 1100
1101 if (vcpu->requests)
3176bc3e 1102 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
04d2cc77
AK		 1103 kvm_x86_ops->tlb_flush(vcpu);
1104
1105 kvm_x86_ops->run(vcpu, kvm_run);
1106
1107 vcpu->guest_mode = 0;
1108 local_irq_enable();
1109
1110 ++vcpu->stat.exits;
1111
0552f73b
LV		 1112 /*
1113 * We must have an instruction between local_irq_enable() and
1114 * kvm_guest_exit(), so the timer interrupt isn't delayed by
1115 * the interrupt shadow. The stat.exits increment will do nicely.
1116 * But we need to prevent reordering, hence this barrier():
1117 */
1118 barrier();
1119
1120 kvm_guest_exit();
1121
04d2cc77
AK		 1122 preempt_enable();
1123
1124 /*
1125 * Profile KVM exit RIPs:
1126 */
1127 if (unlikely(prof_on == KVM_PROFILING)) {
1128 kvm_x86_ops->cache_regs(vcpu);
1129 profile_hit(KVM_PROFILING, (void *)vcpu->rip);
1130 }
1131
1132 r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
1133
1134 if (r > 0) {
1135 if (dm_request_for_irq_injection(vcpu, kvm_run)) {
1136 r = -EINTR;
1137 kvm_run->exit_reason = KVM_EXIT_INTR;
1138 ++vcpu->stat.request_irq_exits;
1139 goto out;
1140 }
1141 if (!need_resched()) {
1142 ++vcpu->stat.light_exits;
1143 goto again;
1144 }
1145 }
1146
1147out:
1148 if (r > 0) {
1149 kvm_resched(vcpu);
1150 goto preempted;
1151 }
1152
1153 post_kvm_run_save(vcpu, kvm_run);
1154
1155 return r;
1156}
1157
1158
bccf2150 1159static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
6aa8b732 1160{
6aa8b732 1161 int r;
1961d276 1162 sigset_t sigsaved;
6aa8b732 1163
bccf2150 1164 vcpu_load(vcpu);
6aa8b732 1165
c5ec1534
HQ		 1166 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_UNINITIALIZED)) {
1167 kvm_vcpu_block(vcpu);
1168 vcpu_put(vcpu);
1169 return -EAGAIN;
1170 }
1171
1961d276
AK		 1172 if (vcpu->sigset_active)
1173 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
1174
54810342 1175 /* re-sync apic's tpr */
5cd4f6fd
HQ		 1176 if (!irqchip_in_kernel(vcpu->kvm))
1177 set_cr8(vcpu, kvm_run->cr8);
54810342 1178
02c83209
AK		 1179 if (vcpu->pio.cur_count) {
1180 r = complete_pio(vcpu);
1181 if (r)
1182 goto out;
1183 }
34c16eec 1184#if CONFIG_HAS_IOMEM
02c83209
AK		 1185 if (vcpu->mmio_needed) {
1186 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1187 vcpu->mmio_read_completed = 1;
1188 vcpu->mmio_needed = 0;
1189 r = emulate_instruction(vcpu, kvm_run,
3427318f 1190 vcpu->mmio_fault_cr2, 0, 1);
02c83209
AK		 1191 if (r == EMULATE_DO_MMIO) {
1192 /*
1193 * Read-modify-write. Back to userspace.
1194 */
02c83209
AK		 1195 r = 0;
1196 goto out;
46fc1477 1197 }
6aa8b732 1198 }
34c16eec 1199#endif
8eb7d334 1200 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
cbdd1bea 1201 kvm_x86_ops->cache_regs(vcpu);
b4e63f56 1202 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
cbdd1bea 1203 kvm_x86_ops->decache_regs(vcpu);
b4e63f56
AK		 1204 }
1205
04d2cc77 1206 r = __vcpu_run(vcpu, kvm_run);
6aa8b732 1207
039576c0 1208out:
1961d276
AK		 1209 if (vcpu->sigset_active)
1210 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1211
6aa8b732
AK		 1212 vcpu_put(vcpu);
1213 return r;
1214}
1215
bccf2150
AK		 1216static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
1217 struct kvm_regs *regs)
6aa8b732 1218{
bccf2150 1219 vcpu_load(vcpu);
6aa8b732 1220
cbdd1bea 1221 kvm_x86_ops->cache_regs(vcpu);
6aa8b732
AK		 1222
1223 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1224 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1225 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1226 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1227 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1228 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1229 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1230 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1231#ifdef CONFIG_X86_64
6aa8b732
AK		 1232 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1233 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1234 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1235 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1236 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1237 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1238 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1239 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1240#endif
1241
1242 regs->rip = vcpu->rip;
cbdd1bea 1243 regs->rflags = kvm_x86_ops->get_rflags(vcpu);
6aa8b732
AK		 1244
1245 /*
1246 * Don't leak debug flags in case they were set for guest debugging
1247 */
1248 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1249 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1250
1251 vcpu_put(vcpu);
1252
1253 return 0;
1254}
1255
bccf2150
AK		 1256static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
1257 struct kvm_regs *regs)
6aa8b732 1258{
bccf2150 1259 vcpu_load(vcpu);
6aa8b732
AK		 1260
1261 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1262 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1263 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1264 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1265 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1266 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1267 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1268 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1269#ifdef CONFIG_X86_64
6aa8b732
AK		 1270 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1271 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1272 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1273 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1274 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1275 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1276 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1277 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1278#endif
1279
1280 vcpu->rip = regs->rip;
cbdd1bea 1281 kvm_x86_ops->set_rflags(vcpu, regs->rflags);
6aa8b732 1282
cbdd1bea 1283 kvm_x86_ops->decache_regs(vcpu);
6aa8b732
AK		 1284
1285 vcpu_put(vcpu);
1286
1287 return 0;
1288}
1289
1290static void get_segment(struct kvm_vcpu *vcpu,
1291 struct kvm_segment *var, int seg)
1292{
cbdd1bea 1293 return kvm_x86_ops->get_segment(vcpu, var, seg);
6aa8b732
AK		 1294}
1295
bccf2150
AK		 1296static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1297 struct kvm_sregs *sregs)
6aa8b732 1298{
6aa8b732 1299 struct descriptor_table dt;
2a8067f1 1300 int pending_vec;
6aa8b732 1301
bccf2150 1302 vcpu_load(vcpu);
6aa8b732
AK		 1303
1304 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1305 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1306 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1307 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1308 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1309 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1310
1311 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1312 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1313
cbdd1bea 1314 kvm_x86_ops->get_idt(vcpu, &dt);
6aa8b732
AK		 1315 sregs->idt.limit = dt.limit;
1316 sregs->idt.base = dt.base;
cbdd1bea 1317 kvm_x86_ops->get_gdt(vcpu, &dt);
6aa8b732
AK		 1318 sregs->gdt.limit = dt.limit;
1319 sregs->gdt.base = dt.base;
1320
cbdd1bea 1321 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 1322 sregs->cr0 = vcpu->cr0;
1323 sregs->cr2 = vcpu->cr2;
1324 sregs->cr3 = vcpu->cr3;
1325 sregs->cr4 = vcpu->cr4;
7017fc3d 1326 sregs->cr8 = get_cr8(vcpu);
6aa8b732 1327 sregs->efer = vcpu->shadow_efer;
7017fc3d 1328 sregs->apic_base = kvm_get_apic_base(vcpu);
6aa8b732 1329
2a8067f1 1330 if (irqchip_in_kernel(vcpu->kvm)) {
c52fb35a
HQ		 1331 memset(sregs->interrupt_bitmap, 0,
1332 sizeof sregs->interrupt_bitmap);
cbdd1bea 1333 pending_vec = kvm_x86_ops->get_irq(vcpu);
2a8067f1 1334 if (pending_vec >= 0)
d77c26fc
MD		 1335 set_bit(pending_vec,
1336 (unsigned long *)sregs->interrupt_bitmap);
2a8067f1 1337 } else
c52fb35a
HQ		 1338 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1339 sizeof sregs->interrupt_bitmap);
6aa8b732
AK		 1340
1341 vcpu_put(vcpu);
1342
1343 return 0;
1344}
1345
1346static void set_segment(struct kvm_vcpu *vcpu,
1347 struct kvm_segment *var, int seg)
1348{
cbdd1bea 1349 return kvm_x86_ops->set_segment(vcpu, var, seg);
6aa8b732
AK		 1350}
1351
bccf2150
AK		 1352static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
1353 struct kvm_sregs *sregs)
6aa8b732 1354{
6aa8b732 1355 int mmu_reset_needed = 0;
2a8067f1 1356 int i, pending_vec, max_bits;
6aa8b732
AK		 1357 struct descriptor_table dt;
1358
bccf2150 1359 vcpu_load(vcpu);
6aa8b732 1360
6aa8b732
AK		 1361 dt.limit = sregs->idt.limit;
1362 dt.base = sregs->idt.base;
cbdd1bea 1363 kvm_x86_ops->set_idt(vcpu, &dt);
6aa8b732
AK		 1364 dt.limit = sregs->gdt.limit;
1365 dt.base = sregs->gdt.base;
cbdd1bea 1366 kvm_x86_ops->set_gdt(vcpu, &dt);
6aa8b732
AK		 1367
1368 vcpu->cr2 = sregs->cr2;
1369 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1370 vcpu->cr3 = sregs->cr3;
1371
7017fc3d 1372 set_cr8(vcpu, sregs->cr8);
6aa8b732
AK		 1373
1374 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 1375#ifdef CONFIG_X86_64
cbdd1bea 1376 kvm_x86_ops->set_efer(vcpu, sregs->efer);
6aa8b732 1377#endif
7017fc3d 1378 kvm_set_apic_base(vcpu, sregs->apic_base);
6aa8b732 1379
cbdd1bea 1380 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
399badf3 1381
6aa8b732 1382 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
81f50e3b 1383 vcpu->cr0 = sregs->cr0;
cbdd1bea 1384 kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
6aa8b732
AK		 1385
1386 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
cbdd1bea 1387 kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 1388 if (!is_long_mode(vcpu) && is_pae(vcpu))
1389 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 1390
1391 if (mmu_reset_needed)
1392 kvm_mmu_reset_context(vcpu);
1393
c52fb35a
HQ		 1394 if (!irqchip_in_kernel(vcpu->kvm)) {
1395 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1396 sizeof vcpu->irq_pending);
1397 vcpu->irq_summary = 0;
1398 for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i)
1399 if (vcpu->irq_pending[i])
1400 __set_bit(i, &vcpu->irq_summary);
2a8067f1
ED		 1401 } else {
1402 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
1403 pending_vec = find_first_bit(
1404 (const unsigned long *)sregs->interrupt_bitmap,
1405 max_bits);
1406 /* Only pending external irq is handled here */
1407 if (pending_vec < max_bits) {
cbdd1bea 1408 kvm_x86_ops->set_irq(vcpu, pending_vec);
d77c26fc
MD		 1409 pr_debug("Set back pending irq %d\n",
1410 pending_vec);
2a8067f1 1411 }
c52fb35a 1412 }
6aa8b732 1413
024aa1c0
AK		 1414 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1415 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1416 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1417 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1418 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1419 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1420
1421 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1422 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1423
6aa8b732
AK		 1424 vcpu_put(vcpu);
1425
1426 return 0;
1427}
1428
1747fb71
RR		 1429void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
1430{
1431 struct kvm_segment cs;
1432
1433 get_segment(vcpu, &cs, VCPU_SREG_CS);
1434 *db = cs.db;
1435 *l = cs.l;
1436}
1437EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
1438
6aa8b732
AK		 1439/*
1440 * Translate a guest virtual address to a guest physical address.
1441 */
bccf2150
AK		 1442static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
1443 struct kvm_translation *tr)
6aa8b732
AK		 1444{
1445 unsigned long vaddr = tr->linear_address;
6aa8b732
AK		 1446 gpa_t gpa;
1447
bccf2150 1448 vcpu_load(vcpu);
11ec2804 1449 mutex_lock(&vcpu->kvm->lock);
6aa8b732
AK		 1450 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1451 tr->physical_address = gpa;
1452 tr->valid = gpa != UNMAPPED_GVA;
1453 tr->writeable = 1;
1454 tr->usermode = 0;
11ec2804 1455 mutex_unlock(&vcpu->kvm->lock);
6aa8b732
AK		 1456 vcpu_put(vcpu);
1457
1458 return 0;
1459}
1460
bccf2150
AK		 1461static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
1462 struct kvm_interrupt *irq)
6aa8b732 1463{
6aa8b732
AK		 1464 if (irq->irq < 0 || irq->irq >= 256)
1465 return -EINVAL;
97222cc8
ED		 1466 if (irqchip_in_kernel(vcpu->kvm))
1467 return -ENXIO;
bccf2150 1468 vcpu_load(vcpu);
6aa8b732
AK		 1469
1470 set_bit(irq->irq, vcpu->irq_pending);
1471 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1472
1473 vcpu_put(vcpu);
1474
1475 return 0;
1476}
1477
bccf2150
AK		 1478static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
1479 struct kvm_debug_guest *dbg)
6aa8b732 1480{
6aa8b732
AK		 1481 int r;
1482
bccf2150 1483 vcpu_load(vcpu);
6aa8b732 1484
cbdd1bea 1485 r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
6aa8b732
AK		 1486
1487 vcpu_put(vcpu);
1488
1489 return r;
1490}
1491
9a2bb7f4
AK		 1492static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
1493 unsigned long address,
1494 int *type)
1495{
1496 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1497 unsigned long pgoff;
1498 struct page *page;
1499
9a2bb7f4 1500 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
039576c0
AK		 1501 if (pgoff == 0)
1502 page = virt_to_page(vcpu->run);
1503 else if (pgoff == KVM_PIO_PAGE_OFFSET)
1504 page = virt_to_page(vcpu->pio_data);
1505 else
9a2bb7f4 1506 return NOPAGE_SIGBUS;
9a2bb7f4 1507 get_page(page);
cd0d9137
NAQ		 1508 if (type != NULL)
1509 *type = VM_FAULT_MINOR;
1510
9a2bb7f4
AK		 1511 return page;
1512}
1513
1514static struct vm_operations_struct kvm_vcpu_vm_ops = {
1515 .nopage = kvm_vcpu_nopage,
1516};
1517
1518static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1519{
1520 vma->vm_ops = &kvm_vcpu_vm_ops;
1521 return 0;
1522}
1523
bccf2150
AK		 1524static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1525{
1526 struct kvm_vcpu *vcpu = filp->private_data;
1527
1528 fput(vcpu->kvm->filp);
1529 return 0;
1530}
1531
1532static struct file_operations kvm_vcpu_fops = {
1533 .release = kvm_vcpu_release,
1534 .unlocked_ioctl = kvm_vcpu_ioctl,
1535 .compat_ioctl = kvm_vcpu_ioctl,
9a2bb7f4 1536 .mmap = kvm_vcpu_mmap,
bccf2150
AK		 1537};
1538
1539/*
1540 * Allocates an inode for the vcpu.
1541 */
1542static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1543{
1544 int fd, r;
1545 struct inode *inode;
1546 struct file *file;
1547
d6d28168
AK		 1548 r = anon_inode_getfd(&fd, &inode, &file,
1549 "kvm-vcpu", &kvm_vcpu_fops, vcpu);
1550 if (r)
1551 return r;
bccf2150 1552 atomic_inc(&vcpu->kvm->filp->f_count);
bccf2150 1553 return fd;
bccf2150
AK		 1554}
1555
c5ea7660
AK		 1556/*
1557 * Creates some virtual cpus. Good luck creating more than one.
1558 */
1559static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
1560{
1561 int r;
1562 struct kvm_vcpu *vcpu;
1563
c5ea7660 1564 if (!valid_vcpu(n))
fb3f0f51 1565 return -EINVAL;
c5ea7660 1566
cbdd1bea 1567 vcpu = kvm_x86_ops->vcpu_create(kvm, n);
fb3f0f51
RR		 1568 if (IS_ERR(vcpu))
1569 return PTR_ERR(vcpu);
c5ea7660 1570
15ad7146
AK		 1571 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1572
b114b080
RR		 1573 /* We do fxsave: this must be aligned. */
1574 BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
1575
fb3f0f51 1576 vcpu_load(vcpu);
e00c8cf2
AK		 1577 r = kvm_x86_ops->vcpu_reset(vcpu);
1578 if (r == 0)
1579 r = kvm_mmu_setup(vcpu);
c5ea7660 1580 vcpu_put(vcpu);
c5ea7660 1581 if (r < 0)
fb3f0f51
RR		 1582 goto free_vcpu;
1583
11ec2804 1584 mutex_lock(&kvm->lock);
fb3f0f51
RR		 1585 if (kvm->vcpus[n]) {
1586 r = -EEXIST;
11ec2804 1587 mutex_unlock(&kvm->lock);
fb3f0f51
RR		 1588 goto mmu_unload;
1589 }
1590 kvm->vcpus[n] = vcpu;
11ec2804 1591 mutex_unlock(&kvm->lock);
c5ea7660 1592
fb3f0f51 1593 /* Now it's all set up, let userspace reach it */
bccf2150
AK		 1594 r = create_vcpu_fd(vcpu);
1595 if (r < 0)
fb3f0f51
RR		 1596 goto unlink;
1597 return r;
39c3b86e 1598
fb3f0f51 1599unlink:
11ec2804 1600 mutex_lock(&kvm->lock);
fb3f0f51 1601 kvm->vcpus[n] = NULL;
11ec2804 1602 mutex_unlock(&kvm->lock);
a2fa3e9f 1603
fb3f0f51
RR		 1604mmu_unload:
1605 vcpu_load(vcpu);
1606 kvm_mmu_unload(vcpu);
1607 vcpu_put(vcpu);
c5ea7660 1608
fb3f0f51 1609free_vcpu:
cbdd1bea 1610 kvm_x86_ops->vcpu_free(vcpu);
c5ea7660
AK		 1611 return r;
1612}
1613
1961d276
AK		 1614static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1615{
1616 if (sigset) {
1617 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1618 vcpu->sigset_active = 1;
1619 vcpu->sigset = *sigset;
1620 } else
1621 vcpu->sigset_active = 0;
1622 return 0;
1623}
1624
b8836737
AK		 1625/*
1626 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
1627 * we have asm/x86/processor.h
1628 */
1629struct fxsave {
1630 u16 cwd;
1631 u16 swd;
1632 u16 twd;
1633 u16 fop;
1634 u64 rip;
1635 u64 rdp;
1636 u32 mxcsr;
1637 u32 mxcsr_mask;
1638 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
1639#ifdef CONFIG_X86_64
1640 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
1641#else
1642 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
1643#endif
1644};
1645
1646static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
1647{
b114b080 1648 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
b8836737
AK		 1649
1650 vcpu_load(vcpu);
1651
1652 memcpy(fpu->fpr, fxsave->st_space, 128);
1653 fpu->fcw = fxsave->cwd;
1654 fpu->fsw = fxsave->swd;
1655 fpu->ftwx = fxsave->twd;
1656 fpu->last_opcode = fxsave->fop;
1657 fpu->last_ip = fxsave->rip;
1658 fpu->last_dp = fxsave->rdp;
1659 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
1660
1661 vcpu_put(vcpu);
1662
1663 return 0;
1664}
1665
1666static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
1667{
b114b080 1668 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
b8836737
AK		 1669
1670 vcpu_load(vcpu);
1671
1672 memcpy(fxsave->st_space, fpu->fpr, 128);
1673 fxsave->cwd = fpu->fcw;
1674 fxsave->swd = fpu->fsw;
1675 fxsave->twd = fpu->ftwx;
1676 fxsave->fop = fpu->last_opcode;
1677 fxsave->rip = fpu->last_ip;
1678 fxsave->rdp = fpu->last_dp;
1679 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
1680
1681 vcpu_put(vcpu);
1682
1683 return 0;
1684}
1685
bccf2150
AK		 1686static long kvm_vcpu_ioctl(struct file *filp,
1687 unsigned int ioctl, unsigned long arg)
6aa8b732 1688{
bccf2150 1689 struct kvm_vcpu *vcpu = filp->private_data;
2f366987 1690 void __user *argp = (void __user *)arg;
313a3dc7 1691 int r;
6aa8b732
AK		 1692
1693 switch (ioctl) {
9a2bb7f4 1694 case KVM_RUN:
f0fe5108
AK		 1695 r = -EINVAL;
1696 if (arg)
1697 goto out;
9a2bb7f4 1698 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
6aa8b732 1699 break;
6aa8b732
AK		 1700 case KVM_GET_REGS: {
1701 struct kvm_regs kvm_regs;
1702
bccf2150
AK		 1703 memset(&kvm_regs, 0, sizeof kvm_regs);
1704 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
6aa8b732
AK		 1705 if (r)
1706 goto out;
1707 r = -EFAULT;
2f366987 1708 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 1709 goto out;
1710 r = 0;
1711 break;
1712 }
1713 case KVM_SET_REGS: {
1714 struct kvm_regs kvm_regs;
1715
1716 r = -EFAULT;
2f366987 1717 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732 1718 goto out;
bccf2150 1719 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
6aa8b732
AK		 1720 if (r)
1721 goto out;
1722 r = 0;
1723 break;
1724 }
1725 case KVM_GET_SREGS: {
1726 struct kvm_sregs kvm_sregs;
1727
bccf2150
AK		 1728 memset(&kvm_sregs, 0, sizeof kvm_sregs);
1729 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 1730 if (r)
1731 goto out;
1732 r = -EFAULT;
2f366987 1733 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 1734 goto out;
1735 r = 0;
1736 break;
1737 }
1738 case KVM_SET_SREGS: {
1739 struct kvm_sregs kvm_sregs;
1740
1741 r = -EFAULT;
2f366987 1742 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732 1743 goto out;
bccf2150 1744 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 1745 if (r)
1746 goto out;
1747 r = 0;
1748 break;
1749 }
1750 case KVM_TRANSLATE: {
1751 struct kvm_translation tr;
1752
1753 r = -EFAULT;
2f366987 1754 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732 1755 goto out;
bccf2150 1756 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
6aa8b732
AK		 1757 if (r)
1758 goto out;
1759 r = -EFAULT;
2f366987 1760 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 1761 goto out;
1762 r = 0;
1763 break;
1764 }
1765 case KVM_INTERRUPT: {
1766 struct kvm_interrupt irq;
1767
1768 r = -EFAULT;
2f366987 1769 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732 1770 goto out;
bccf2150 1771 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
6aa8b732
AK		 1772 if (r)
1773 goto out;
1774 r = 0;
1775 break;
1776 }
1777 case KVM_DEBUG_GUEST: {
1778 struct kvm_debug_guest dbg;
1779
1780 r = -EFAULT;
2f366987 1781 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732 1782 goto out;
bccf2150 1783 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
6aa8b732
AK		 1784 if (r)
1785 goto out;
1786 r = 0;
1787 break;
1788 }
1961d276
AK		 1789 case KVM_SET_SIGNAL_MASK: {
1790 struct kvm_signal_mask __user *sigmask_arg = argp;
1791 struct kvm_signal_mask kvm_sigmask;
1792 sigset_t sigset, *p;
1793
1794 p = NULL;
1795 if (argp) {
1796 r = -EFAULT;
1797 if (copy_from_user(&kvm_sigmask, argp,
1798 sizeof kvm_sigmask))
1799 goto out;
1800 r = -EINVAL;
1801 if (kvm_sigmask.len != sizeof sigset)
1802 goto out;
1803 r = -EFAULT;
1804 if (copy_from_user(&sigset, sigmask_arg->sigset,
1805 sizeof sigset))
1806 goto out;
1807 p = &sigset;
1808 }
1809 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1810 break;
1811 }
b8836737
AK		 1812 case KVM_GET_FPU: {
1813 struct kvm_fpu fpu;
1814
1815 memset(&fpu, 0, sizeof fpu);
1816 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
1817 if (r)
1818 goto out;
1819 r = -EFAULT;
1820 if (copy_to_user(argp, &fpu, sizeof fpu))
1821 goto out;
1822 r = 0;
1823 break;
1824 }
1825 case KVM_SET_FPU: {
1826 struct kvm_fpu fpu;
1827
1828 r = -EFAULT;
1829 if (copy_from_user(&fpu, argp, sizeof fpu))
1830 goto out;
1831 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
1832 if (r)
1833 goto out;
1834 r = 0;
1835 break;
1836 }
bccf2150 1837 default:
313a3dc7 1838 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
bccf2150
AK		 1839 }
1840out:
1841 return r;
1842}
1843
1844static long kvm_vm_ioctl(struct file *filp,
1845 unsigned int ioctl, unsigned long arg)
1846{
1847 struct kvm *kvm = filp->private_data;
1848 void __user *argp = (void __user *)arg;
1fe779f8 1849 int r;
bccf2150
AK		 1850
1851 switch (ioctl) {
1852 case KVM_CREATE_VCPU:
1853 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1854 if (r < 0)
1855 goto out;
1856 break;
6fc138d2
IE		 1857 case KVM_SET_USER_MEMORY_REGION: {
1858 struct kvm_userspace_memory_region kvm_userspace_mem;
1859
1860 r = -EFAULT;
1861 if (copy_from_user(&kvm_userspace_mem, argp,
1862 sizeof kvm_userspace_mem))
1863 goto out;
1864
1865 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
6aa8b732
AK		 1866 if (r)
1867 goto out;
1868 break;
1869 }
1870 case KVM_GET_DIRTY_LOG: {
1871 struct kvm_dirty_log log;
1872
1873 r = -EFAULT;
2f366987 1874 if (copy_from_user(&log, argp, sizeof log))
6aa8b732 1875 goto out;
2c6f5df9 1876 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
6aa8b732
AK		 1877 if (r)
1878 goto out;
1879 break;
1880 }
f17abe9a 1881 default:
1fe779f8 1882 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
f17abe9a
AK		 1883 }
1884out:
1885 return r;
1886}
1887
1888static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
1889 unsigned long address,
1890 int *type)
1891{
1892 struct kvm *kvm = vma->vm_file->private_data;
1893 unsigned long pgoff;
f17abe9a
AK		 1894 struct page *page;
1895
f17abe9a 1896 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
e0d62c7f
IE		 1897 if (!kvm_is_visible_gfn(kvm, pgoff))
1898 return NOPAGE_SIGBUS;
aab61cc0
AL		 1899 /* current->mm->mmap_sem is already held so call lockless version */
1900 page = __gfn_to_page(kvm, pgoff);
8a7ae055
IE		 1901 if (is_error_page(page)) {
1902 kvm_release_page(page);
f17abe9a 1903 return NOPAGE_SIGBUS;
8a7ae055 1904 }
cd0d9137
NAQ		 1905 if (type != NULL)
1906 *type = VM_FAULT_MINOR;
1907
f17abe9a
AK		 1908 return page;
1909}
1910
1911static struct vm_operations_struct kvm_vm_vm_ops = {
1912 .nopage = kvm_vm_nopage,
1913};
1914
1915static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1916{
1917 vma->vm_ops = &kvm_vm_vm_ops;
1918 return 0;
1919}
1920
1921static struct file_operations kvm_vm_fops = {
1922 .release = kvm_vm_release,
1923 .unlocked_ioctl = kvm_vm_ioctl,
1924 .compat_ioctl = kvm_vm_ioctl,
1925 .mmap = kvm_vm_mmap,
1926};
1927
1928static int kvm_dev_ioctl_create_vm(void)
1929{
1930 int fd, r;
1931 struct inode *inode;
1932 struct file *file;
1933 struct kvm *kvm;
1934
f17abe9a 1935 kvm = kvm_create_vm();
d6d28168
AK		 1936 if (IS_ERR(kvm))
1937 return PTR_ERR(kvm);
1938 r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
1939 if (r) {
1940 kvm_destroy_vm(kvm);
1941 return r;
f17abe9a
AK		 1942 }
1943
bccf2150 1944 kvm->filp = file;
f17abe9a 1945
f17abe9a 1946 return fd;
f17abe9a
AK		 1947}
1948
1949static long kvm_dev_ioctl(struct file *filp,
1950 unsigned int ioctl, unsigned long arg)
1951{
1952 void __user *argp = (void __user *)arg;
07c45a36 1953 long r = -EINVAL;
f17abe9a
AK		 1954
1955 switch (ioctl) {
1956 case KVM_GET_API_VERSION:
f0fe5108
AK		 1957 r = -EINVAL;
1958 if (arg)
1959 goto out;
f17abe9a
AK		 1960 r = KVM_API_VERSION;
1961 break;
1962 case KVM_CREATE_VM:
f0fe5108
AK		 1963 r = -EINVAL;
1964 if (arg)
1965 goto out;
f17abe9a
AK		 1966 r = kvm_dev_ioctl_create_vm();
1967 break;
85f455f7
ED		 1968 case KVM_CHECK_EXTENSION: {
1969 int ext = (long)argp;
1970
1971 switch (ext) {
1972 case KVM_CAP_IRQCHIP:
b6958ce4 1973 case KVM_CAP_HLT:
82ce2c96 1974 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
6fc138d2 1975 case KVM_CAP_USER_MEMORY:
cbc94022 1976 case KVM_CAP_SET_TSS_ADDR:
85f455f7
ED		 1977 r = 1;
1978 break;
1979 default:
1980 r = 0;
1981 break;
1982 }
5d308f45 1983 break;
85f455f7 1984 }
07c45a36
AK		 1985 case KVM_GET_VCPU_MMAP_SIZE:
1986 r = -EINVAL;
1987 if (arg)
1988 goto out;
039576c0 1989 r = 2 * PAGE_SIZE;
07c45a36 1990 break;
6aa8b732 1991 default:
043405e1 1992 return kvm_arch_dev_ioctl(filp, ioctl, arg);
6aa8b732
AK		 1993 }
1994out:
1995 return r;
1996}
1997
6aa8b732 1998static struct file_operations kvm_chardev_ops = {
6aa8b732
AK		 1999 .unlocked_ioctl = kvm_dev_ioctl,
2000 .compat_ioctl = kvm_dev_ioctl,
6aa8b732
AK		 2001};
2002
2003static struct miscdevice kvm_dev = {
bbe4432e 2004 KVM_MINOR,
6aa8b732
AK		 2005 "kvm",
2006 &kvm_chardev_ops,
2007};
2008
774c47f1
AK		 2009/*
2010 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2011 * cached on it.
2012 */
2013static void decache_vcpus_on_cpu(int cpu)
2014{
2015 struct kvm *vm;
2016 struct kvm_vcpu *vcpu;
2017 int i;
2018
2019 spin_lock(&kvm_lock);
11ec2804 2020 list_for_each_entry(vm, &vm_list, vm_list)
774c47f1 2021 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
fb3f0f51
RR		 2022 vcpu = vm->vcpus[i];
2023 if (!vcpu)
2024 continue;
774c47f1
AK		 2025 /*
2026 * If the vcpu is locked, then it is running on some
2027 * other cpu and therefore it is not cached on the
2028 * cpu in question.
2029 *
2030 * If it's not locked, check the last cpu it executed
2031 * on.
2032 */
2033 if (mutex_trylock(&vcpu->mutex)) {
2034 if (vcpu->cpu == cpu) {
cbdd1bea 2035 kvm_x86_ops->vcpu_decache(vcpu);
774c47f1
AK		 2036 vcpu->cpu = -1;
2037 }
2038 mutex_unlock(&vcpu->mutex);
2039 }
2040 }
2041 spin_unlock(&kvm_lock);
2042}
2043
1b6c0168
AK		 2044static void hardware_enable(void *junk)
2045{
2046 int cpu = raw_smp_processor_id();
2047
2048 if (cpu_isset(cpu, cpus_hardware_enabled))
2049 return;
2050 cpu_set(cpu, cpus_hardware_enabled);
cbdd1bea 2051 kvm_x86_ops->hardware_enable(NULL);
1b6c0168
AK		 2052}
2053
2054static void hardware_disable(void *junk)
2055{
2056 int cpu = raw_smp_processor_id();
2057
2058 if (!cpu_isset(cpu, cpus_hardware_enabled))
2059 return;
2060 cpu_clear(cpu, cpus_hardware_enabled);
2061 decache_vcpus_on_cpu(cpu);
cbdd1bea 2062 kvm_x86_ops->hardware_disable(NULL);
1b6c0168
AK		 2063}
2064
774c47f1
AK		 2065static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2066 void *v)
2067{
2068 int cpu = (long)v;
2069
2070 switch (val) {
cec9ad27
AK		 2071 case CPU_DYING:
2072 case CPU_DYING_FROZEN:
6ec8a856
AK		 2073 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2074 cpu);
2075 hardware_disable(NULL);
2076 break;
774c47f1 2077 case CPU_UP_CANCELED:
8bb78442 2078 case CPU_UP_CANCELED_FROZEN:
43934a38
JK		 2079 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2080 cpu);
1b6c0168 2081 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
774c47f1 2082 break;
43934a38 2083 case CPU_ONLINE:
8bb78442 2084 case CPU_ONLINE_FROZEN:
43934a38
JK		 2085 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2086 cpu);
1b6c0168 2087 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
774c47f1
AK		 2088 break;
2089 }
2090 return NOTIFY_OK;
2091}
2092
9a2b85c6 2093static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
d77c26fc 2094 void *v)
9a2b85c6
RR		 2095{
2096 if (val == SYS_RESTART) {
2097 /*
2098 * Some (well, at least mine) BIOSes hang on reboot if
2099 * in vmx root mode.
2100 */
2101 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2102 on_each_cpu(hardware_disable, NULL, 0, 1);
2103 }
2104 return NOTIFY_OK;
2105}
2106
2107static struct notifier_block kvm_reboot_notifier = {
2108 .notifier_call = kvm_reboot,
2109 .priority = 0,
2110};
2111
2eeb2e94
GH		 2112void kvm_io_bus_init(struct kvm_io_bus *bus)
2113{
2114 memset(bus, 0, sizeof(*bus));
2115}
2116
2117void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2118{
2119 int i;
2120
2121 for (i = 0; i < bus->dev_count; i++) {
2122 struct kvm_io_device *pos = bus->devs[i];
2123
2124 kvm_iodevice_destructor(pos);
2125 }
2126}
2127
2128struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
2129{
2130 int i;
2131
2132 for (i = 0; i < bus->dev_count; i++) {
2133 struct kvm_io_device *pos = bus->devs[i];
2134
2135 if (pos->in_range(pos, addr))
2136 return pos;
2137 }
2138
2139 return NULL;
2140}
2141
2142void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
2143{
2144 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
2145
2146 bus->devs[bus->dev_count++] = dev;
2147}
2148
774c47f1
AK		 2149static struct notifier_block kvm_cpu_notifier = {
2150 .notifier_call = kvm_cpu_hotplug,
2151 .priority = 20, /* must be > scheduler priority */
2152};
2153
1165f5fe
AK		 2154static u64 stat_get(void *_offset)
2155{
2156 unsigned offset = (long)_offset;
2157 u64 total = 0;
2158 struct kvm *kvm;
2159 struct kvm_vcpu *vcpu;
2160 int i;
2161
2162 spin_lock(&kvm_lock);
2163 list_for_each_entry(kvm, &vm_list, vm_list)
2164 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
fb3f0f51
RR		 2165 vcpu = kvm->vcpus[i];
2166 if (vcpu)
2167 total += *(u32 *)((void *)vcpu + offset);
1165f5fe
AK		 2168 }
2169 spin_unlock(&kvm_lock);
2170 return total;
2171}
2172
3dea7ca7 2173DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, NULL, "%llu\n");
1165f5fe 2174
6aa8b732
AK		 2175static __init void kvm_init_debug(void)
2176{
2177 struct kvm_stats_debugfs_item *p;
2178
8b6d44c7 2179 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732 2180 for (p = debugfs_entries; p->name; ++p)
1165f5fe
AK		 2181 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
2182 (void *)(long)p->offset,
2183 &stat_fops);
6aa8b732
AK		 2184}
2185
2186static void kvm_exit_debug(void)
2187{
2188 struct kvm_stats_debugfs_item *p;
2189
2190 for (p = debugfs_entries; p->name; ++p)
2191 debugfs_remove(p->dentry);
2192 debugfs_remove(debugfs_dir);
2193}
2194
59ae6c6b
AK		 2195static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2196{
4267c41a 2197 hardware_disable(NULL);
59ae6c6b
AK		 2198 return 0;
2199}
2200
2201static int kvm_resume(struct sys_device *dev)
2202{
4267c41a 2203 hardware_enable(NULL);
59ae6c6b
AK		 2204 return 0;
2205}
2206
2207static struct sysdev_class kvm_sysdev_class = {
af5ca3f4 2208 .name = "kvm",
59ae6c6b
AK		 2209 .suspend = kvm_suspend,
2210 .resume = kvm_resume,
2211};
2212
2213static struct sys_device kvm_sysdev = {
2214 .id = 0,
2215 .cls = &kvm_sysdev_class,
2216};
2217
cea7bb21 2218struct page *bad_page;
6aa8b732 2219
15ad7146
AK		 2220static inline
2221struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2222{
2223 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2224}
2225
2226static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2227{
2228 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2229
cbdd1bea 2230 kvm_x86_ops->vcpu_load(vcpu, cpu);
15ad7146
AK		 2231}
2232
2233static void kvm_sched_out(struct preempt_notifier *pn,
2234 struct task_struct *next)
2235{
2236 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2237
cbdd1bea 2238 kvm_x86_ops->vcpu_put(vcpu);
15ad7146
AK		 2239}
2240
cbdd1bea 2241int kvm_init_x86(struct kvm_x86_ops *ops, unsigned int vcpu_size,
c16f862d 2242 struct module *module)
6aa8b732
AK		 2243{
2244 int r;
002c7f7c 2245 int cpu;
6aa8b732 2246
cbdd1bea 2247 if (kvm_x86_ops) {
09db28b8
YI		 2248 printk(KERN_ERR "kvm: already loaded the other module\n");
2249 return -EEXIST;
2250 }
2251
e097f35c 2252 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 2253 printk(KERN_ERR "kvm: no hardware support\n");
2254 return -EOPNOTSUPP;
2255 }
e097f35c 2256 if (ops->disabled_by_bios()) {
6aa8b732
AK		 2257 printk(KERN_ERR "kvm: disabled by bios\n");
2258 return -EOPNOTSUPP;
2259 }
2260
cbdd1bea 2261 kvm_x86_ops = ops;
e097f35c 2262
cbdd1bea 2263 r = kvm_x86_ops->hardware_setup();
6aa8b732 2264 if (r < 0)
ca45aaae 2265 goto out;
6aa8b732 2266
002c7f7c
YS		 2267 for_each_online_cpu(cpu) {
2268 smp_call_function_single(cpu,
cbdd1bea 2269 kvm_x86_ops->check_processor_compatibility,
002c7f7c
YS		 2270 &r, 0, 1);
2271 if (r < 0)
2272 goto out_free_0;
2273 }
2274
1b6c0168 2275 on_each_cpu(hardware_enable, NULL, 0, 1);
774c47f1
AK		 2276 r = register_cpu_notifier(&kvm_cpu_notifier);
2277 if (r)
2278 goto out_free_1;
6aa8b732
AK		 2279 register_reboot_notifier(&kvm_reboot_notifier);
2280
59ae6c6b
AK		 2281 r = sysdev_class_register(&kvm_sysdev_class);
2282 if (r)
2283 goto out_free_2;
2284
2285 r = sysdev_register(&kvm_sysdev);
2286 if (r)
2287 goto out_free_3;
2288
c16f862d
RR		 2289 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2290 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
2291 __alignof__(struct kvm_vcpu), 0, 0);
2292 if (!kvm_vcpu_cache) {
2293 r = -ENOMEM;
2294 goto out_free_4;
2295 }
2296
6aa8b732
AK		 2297 kvm_chardev_ops.owner = module;
2298
2299 r = misc_register(&kvm_dev);
2300 if (r) {
d77c26fc 2301 printk(KERN_ERR "kvm: misc device register failed\n");
6aa8b732
AK		 2302 goto out_free;
2303 }
2304
15ad7146
AK		 2305 kvm_preempt_ops.sched_in = kvm_sched_in;
2306 kvm_preempt_ops.sched_out = kvm_sched_out;
2307
c7addb90
AK		 2308 kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
2309
2310 return 0;
6aa8b732
AK		 2311
2312out_free:
c16f862d
RR		 2313 kmem_cache_destroy(kvm_vcpu_cache);
2314out_free_4:
59ae6c6b
AK		 2315 sysdev_unregister(&kvm_sysdev);
2316out_free_3:
2317 sysdev_class_unregister(&kvm_sysdev_class);
2318out_free_2:
6aa8b732 2319 unregister_reboot_notifier(&kvm_reboot_notifier);
774c47f1
AK		 2320 unregister_cpu_notifier(&kvm_cpu_notifier);
2321out_free_1:
1b6c0168 2322 on_each_cpu(hardware_disable, NULL, 0, 1);
002c7f7c 2323out_free_0:
cbdd1bea 2324 kvm_x86_ops->hardware_unsetup();
ca45aaae 2325out:
cbdd1bea 2326 kvm_x86_ops = NULL;
6aa8b732
AK		 2327 return r;
2328}
d77c26fc 2329EXPORT_SYMBOL_GPL(kvm_init_x86);
6aa8b732 2330
cbdd1bea 2331void kvm_exit_x86(void)
6aa8b732
AK		 2332{
2333 misc_deregister(&kvm_dev);
c16f862d 2334 kmem_cache_destroy(kvm_vcpu_cache);
59ae6c6b
AK		 2335 sysdev_unregister(&kvm_sysdev);
2336 sysdev_class_unregister(&kvm_sysdev_class);
6aa8b732 2337 unregister_reboot_notifier(&kvm_reboot_notifier);
59ae6c6b 2338 unregister_cpu_notifier(&kvm_cpu_notifier);
1b6c0168 2339 on_each_cpu(hardware_disable, NULL, 0, 1);
cbdd1bea
CE		 2340 kvm_x86_ops->hardware_unsetup();
2341 kvm_x86_ops = NULL;
6aa8b732 2342}
d77c26fc 2343EXPORT_SYMBOL_GPL(kvm_exit_x86);
6aa8b732
AK		 2344
2345static __init int kvm_init(void)
2346{
37e29d90
AK		 2347 int r;
2348
b5a33a75
AK		 2349 r = kvm_mmu_module_init();
2350 if (r)
2351 goto out4;
2352
6aa8b732
AK		 2353 kvm_init_debug();
2354
043405e1 2355 kvm_arch_init();
bf591b24 2356
cea7bb21 2357 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
d77c26fc
MD		 2358
2359 if (bad_page == NULL) {
6aa8b732
AK		 2360 r = -ENOMEM;
2361 goto out;
2362 }
2363
58e690e6 2364 return 0;
6aa8b732
AK		 2365
2366out:
2367 kvm_exit_debug();
b5a33a75
AK		 2368 kvm_mmu_module_exit();
2369out4:
6aa8b732
AK		 2370 return r;
2371}
2372
2373static __exit void kvm_exit(void)
2374{
2375 kvm_exit_debug();
cea7bb21 2376 __free_page(bad_page);
b5a33a75 2377 kvm_mmu_module_exit();
6aa8b732
AK		 2378}
2379
2380module_init(kvm_init)
2381module_exit(kvm_exit)
Linux kernel - Deliverables
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