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KVM: Create an inode per virtual machine
[mirror_ubuntu-artful-kernel.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"
19
20#include <linux/kvm.h>
21#include <linux/module.h>
22#include <linux/errno.h>
23#include <asm/processor.h>
24#include <linux/percpu.h>
25#include <linux/gfp.h>
26#include <asm/msr.h>
27#include <linux/mm.h>
28#include <linux/miscdevice.h>
29#include <linux/vmalloc.h>
30#include <asm/uaccess.h>
31#include <linux/reboot.h>
32#include <asm/io.h>
33#include <linux/debugfs.h>
34#include <linux/highmem.h>
35#include <linux/file.h>
36#include <asm/desc.h>
59ae6c6b 37#include <linux/sysdev.h>
774c47f1 38#include <linux/cpu.h>
f17abe9a 39#include <linux/file.h>
37e29d90
AK		 40#include <linux/fs.h>
41#include <linux/mount.h>
6aa8b732
AK		 42
43#include "x86_emulate.h"
44#include "segment_descriptor.h"
45
46MODULE_AUTHOR("Qumranet");
47MODULE_LICENSE("GPL");
48
133de902
AK		 49static DEFINE_SPINLOCK(kvm_lock);
50static LIST_HEAD(vm_list);
51
6aa8b732
AK		 52struct kvm_arch_ops *kvm_arch_ops;
53struct kvm_stat kvm_stat;
54EXPORT_SYMBOL_GPL(kvm_stat);
55
56static struct kvm_stats_debugfs_item {
57 const char *name;
58 u32 *data;
59 struct dentry *dentry;
60} debugfs_entries[] = {
61 { "pf_fixed", &kvm_stat.pf_fixed },
62 { "pf_guest", &kvm_stat.pf_guest },
63 { "tlb_flush", &kvm_stat.tlb_flush },
64 { "invlpg", &kvm_stat.invlpg },
65 { "exits", &kvm_stat.exits },
66 { "io_exits", &kvm_stat.io_exits },
67 { "mmio_exits", &kvm_stat.mmio_exits },
68 { "signal_exits", &kvm_stat.signal_exits },
c1150d8c
DL		 69 { "irq_window", &kvm_stat.irq_window_exits },
70 { "halt_exits", &kvm_stat.halt_exits },
71 { "request_irq", &kvm_stat.request_irq_exits },
6aa8b732 72 { "irq_exits", &kvm_stat.irq_exits },
8b6d44c7 73 { NULL, NULL }
6aa8b732
AK		 74};
75
76static struct dentry *debugfs_dir;
77
37e29d90
AK		 78#define KVMFS_MAGIC 0x19700426
79struct vfsmount *kvmfs_mnt;
80
6aa8b732
AK		 81#define MAX_IO_MSRS 256
82
83#define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
84#define LMSW_GUEST_MASK 0x0eULL
85#define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
86#define CR8_RESEVED_BITS (~0x0fULL)
87#define EFER_RESERVED_BITS 0xfffffffffffff2fe
88
05b3e0c2 89#ifdef CONFIG_X86_64
6aa8b732
AK		 90// LDT or TSS descriptor in the GDT. 16 bytes.
91struct segment_descriptor_64 {
92 struct segment_descriptor s;
93 u32 base_higher;
94 u32 pad_zero;
95};
96
97#endif
98
f17abe9a
AK		 99static struct inode *kvmfs_inode(struct file_operations *fops)
100{
101 int error = -ENOMEM;
102 struct inode *inode = new_inode(kvmfs_mnt->mnt_sb);
103
104 if (!inode)
105 goto eexit_1;
106
107 inode->i_fop = fops;
108
109 /*
110 * Mark the inode dirty from the very beginning,
111 * that way it will never be moved to the dirty
112 * list because mark_inode_dirty() will think
113 * that it already _is_ on the dirty list.
114 */
115 inode->i_state = I_DIRTY;
116 inode->i_mode = S_IRUSR | S_IWUSR;
117 inode->i_uid = current->fsuid;
118 inode->i_gid = current->fsgid;
119 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
120 return inode;
121
122eexit_1:
123 return ERR_PTR(error);
124}
125
126static struct file *kvmfs_file(struct inode *inode, void *private_data)
127{
128 struct file *file = get_empty_filp();
129
130 if (!file)
131 return ERR_PTR(-ENFILE);
132
133 file->f_path.mnt = mntget(kvmfs_mnt);
134 file->f_path.dentry = d_alloc_anon(inode);
135 if (!file->f_path.dentry)
136 return ERR_PTR(-ENOMEM);
137 file->f_mapping = inode->i_mapping;
138
139 file->f_pos = 0;
140 file->f_flags = O_RDWR;
141 file->f_op = inode->i_fop;
142 file->f_mode = FMODE_READ | FMODE_WRITE;
143 file->f_version = 0;
144 file->private_data = private_data;
145 return file;
146}
147
6aa8b732
AK		 148unsigned long segment_base(u16 selector)
149{
150 struct descriptor_table gdt;
151 struct segment_descriptor *d;
152 unsigned long table_base;
153 typedef unsigned long ul;
154 unsigned long v;
155
156 if (selector == 0)
157 return 0;
158
159 asm ("sgdt %0" : "=m"(gdt));
160 table_base = gdt.base;
161
162 if (selector & 4) { /* from ldt */
163 u16 ldt_selector;
164
165 asm ("sldt %0" : "=g"(ldt_selector));
166 table_base = segment_base(ldt_selector);
167 }
168 d = (struct segment_descriptor *)(table_base + (selector & ~7));
169 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
05b3e0c2 170#ifdef CONFIG_X86_64
6aa8b732
AK		 171 if (d->system == 0
172 && (d->type == 2 || d->type == 9 || d->type == 11))
173 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
174#endif
175 return v;
176}
177EXPORT_SYMBOL_GPL(segment_base);
178
5aacf0ca
JM		 179static inline int valid_vcpu(int n)
180{
181 return likely(n >= 0 && n < KVM_MAX_VCPUS);
182}
183
d27d4aca
AK		 184int kvm_read_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
185 void *dest)
6aa8b732
AK		 186{
187 unsigned char *host_buf = dest;
188 unsigned long req_size = size;
189
190 while (size) {
191 hpa_t paddr;
192 unsigned now;
193 unsigned offset;
194 hva_t guest_buf;
195
196 paddr = gva_to_hpa(vcpu, addr);
197
198 if (is_error_hpa(paddr))
199 break;
200
201 guest_buf = (hva_t)kmap_atomic(
202 pfn_to_page(paddr >> PAGE_SHIFT),
203 KM_USER0);
204 offset = addr & ~PAGE_MASK;
205 guest_buf |= offset;
206 now = min(size, PAGE_SIZE - offset);
207 memcpy(host_buf, (void*)guest_buf, now);
208 host_buf += now;
209 addr += now;
210 size -= now;
211 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
212 }
213 return req_size - size;
214}
215EXPORT_SYMBOL_GPL(kvm_read_guest);
216
d27d4aca
AK		 217int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
218 void *data)
6aa8b732
AK		 219{
220 unsigned char *host_buf = data;
221 unsigned long req_size = size;
222
223 while (size) {
224 hpa_t paddr;
225 unsigned now;
226 unsigned offset;
227 hva_t guest_buf;
228
229 paddr = gva_to_hpa(vcpu, addr);
230
231 if (is_error_hpa(paddr))
232 break;
233
234 guest_buf = (hva_t)kmap_atomic(
235 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
236 offset = addr & ~PAGE_MASK;
237 guest_buf |= offset;
238 now = min(size, PAGE_SIZE - offset);
239 memcpy((void*)guest_buf, host_buf, now);
240 host_buf += now;
241 addr += now;
242 size -= now;
243 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
244 }
245 return req_size - size;
246}
247EXPORT_SYMBOL_GPL(kvm_write_guest);
248
249static int vcpu_slot(struct kvm_vcpu *vcpu)
250{
251 return vcpu - vcpu->kvm->vcpus;
252}
253
254/*
255 * Switches to specified vcpu, until a matching vcpu_put()
256 */
257static struct kvm_vcpu *vcpu_load(struct kvm *kvm, int vcpu_slot)
258{
259 struct kvm_vcpu *vcpu = &kvm->vcpus[vcpu_slot];
260
261 mutex_lock(&vcpu->mutex);
262 if (unlikely(!vcpu->vmcs)) {
263 mutex_unlock(&vcpu->mutex);
8b6d44c7 264 return NULL;
6aa8b732
AK		 265 }
266 return kvm_arch_ops->vcpu_load(vcpu);
267}
268
269static void vcpu_put(struct kvm_vcpu *vcpu)
270{
271 kvm_arch_ops->vcpu_put(vcpu);
6aa8b732
AK		 272 mutex_unlock(&vcpu->mutex);
273}
274
f17abe9a 275static struct kvm *kvm_create_vm(void)
6aa8b732
AK		 276{
277 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
278 int i;
279
280 if (!kvm)
f17abe9a 281 return ERR_PTR(-ENOMEM);
6aa8b732
AK		 282
283 spin_lock_init(&kvm->lock);
284 INIT_LIST_HEAD(&kvm->active_mmu_pages);
285 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
286 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
287
288 mutex_init(&vcpu->mutex);
133de902 289 vcpu->cpu = -1;
86a2b42e 290 vcpu->kvm = kvm;
6aa8b732
AK		 291 vcpu->mmu.root_hpa = INVALID_PAGE;
292 INIT_LIST_HEAD(&vcpu->free_pages);
133de902
AK		 293 spin_lock(&kvm_lock);
294 list_add(&kvm->vm_list, &vm_list);
295 spin_unlock(&kvm_lock);
6aa8b732 296 }
f17abe9a
AK		 297 return kvm;
298}
299
300static int kvm_dev_open(struct inode *inode, struct file *filp)
301{
6aa8b732
AK		 302 return 0;
303}
304
305/*
306 * Free any memory in @free but not in @dont.
307 */
308static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
309 struct kvm_memory_slot *dont)
310{
311 int i;
312
313 if (!dont || free->phys_mem != dont->phys_mem)
314 if (free->phys_mem) {
315 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 316 if (free->phys_mem[i])
317 __free_page(free->phys_mem[i]);
6aa8b732
AK		 318 vfree(free->phys_mem);
319 }
320
321 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
322 vfree(free->dirty_bitmap);
323
8b6d44c7 324 free->phys_mem = NULL;
6aa8b732 325 free->npages = 0;
8b6d44c7 326 free->dirty_bitmap = NULL;
6aa8b732
AK		 327}
328
329static void kvm_free_physmem(struct kvm *kvm)
330{
331 int i;
332
333 for (i = 0; i < kvm->nmemslots; ++i)
8b6d44c7 334 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
6aa8b732
AK		 335}
336
337static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
338{
1e8ba6fb
IM		 339 if (!vcpu_load(vcpu->kvm, vcpu_slot(vcpu)))
340 return;
341
6aa8b732 342 kvm_mmu_destroy(vcpu);
08438475 343 vcpu_put(vcpu);
9ede74e0 344 kvm_arch_ops->vcpu_free(vcpu);
6aa8b732
AK		 345}
346
347static void kvm_free_vcpus(struct kvm *kvm)
348{
349 unsigned int i;
350
351 for (i = 0; i < KVM_MAX_VCPUS; ++i)
352 kvm_free_vcpu(&kvm->vcpus[i]);
353}
354
355static int kvm_dev_release(struct inode *inode, struct file *filp)
356{
f17abe9a
AK		 357 return 0;
358}
6aa8b732 359
f17abe9a
AK		 360static void kvm_destroy_vm(struct kvm *kvm)
361{
133de902
AK		 362 spin_lock(&kvm_lock);
363 list_del(&kvm->vm_list);
364 spin_unlock(&kvm_lock);
6aa8b732
AK		 365 kvm_free_vcpus(kvm);
366 kvm_free_physmem(kvm);
367 kfree(kvm);
f17abe9a
AK		 368}
369
370static int kvm_vm_release(struct inode *inode, struct file *filp)
371{
372 struct kvm *kvm = filp->private_data;
373
374 kvm_destroy_vm(kvm);
6aa8b732
AK		 375 return 0;
376}
377
378static void inject_gp(struct kvm_vcpu *vcpu)
379{
380 kvm_arch_ops->inject_gp(vcpu, 0);
381}
382
1342d353
AK		 383/*
384 * Load the pae pdptrs. Return true is they are all valid.
385 */
386static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
6aa8b732
AK		 387{
388 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
1342d353 389 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
6aa8b732
AK		 390 int i;
391 u64 pdpte;
392 u64 *pdpt;
1342d353 393 int ret;
6aa8b732
AK		 394 struct kvm_memory_slot *memslot;
395
396 spin_lock(&vcpu->kvm->lock);
397 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
398 /* FIXME: !memslot - emulate? 0xff? */
399 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
400
1342d353 401 ret = 1;
6aa8b732
AK		 402 for (i = 0; i < 4; ++i) {
403 pdpte = pdpt[offset + i];
1342d353
AK		 404 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
405 ret = 0;
406 goto out;
407 }
6aa8b732
AK		 408 }
409
1342d353
AK		 410 for (i = 0; i < 4; ++i)
411 vcpu->pdptrs[i] = pdpt[offset + i];
412
413out:
6aa8b732
AK		 414 kunmap_atomic(pdpt, KM_USER0);
415 spin_unlock(&vcpu->kvm->lock);
416
1342d353 417 return ret;
6aa8b732
AK		 418}
419
420void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
421{
422 if (cr0 & CR0_RESEVED_BITS) {
423 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
424 cr0, vcpu->cr0);
425 inject_gp(vcpu);
426 return;
427 }
428
429 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
430 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
431 inject_gp(vcpu);
432 return;
433 }
434
435 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
436 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
437 "and a clear PE flag\n");
438 inject_gp(vcpu);
439 return;
440 }
441
442 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 443#ifdef CONFIG_X86_64
6aa8b732
AK		 444 if ((vcpu->shadow_efer & EFER_LME)) {
445 int cs_db, cs_l;
446
447 if (!is_pae(vcpu)) {
448 printk(KERN_DEBUG "set_cr0: #GP, start paging "
449 "in long mode while PAE is disabled\n");
450 inject_gp(vcpu);
451 return;
452 }
453 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
454 if (cs_l) {
455 printk(KERN_DEBUG "set_cr0: #GP, start paging "
456 "in long mode while CS.L == 1\n");
457 inject_gp(vcpu);
458 return;
459
460 }
461 } else
462#endif
1342d353 463 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 464 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
465 "reserved bits\n");
466 inject_gp(vcpu);
467 return;
468 }
469
470 }
471
472 kvm_arch_ops->set_cr0(vcpu, cr0);
473 vcpu->cr0 = cr0;
474
475 spin_lock(&vcpu->kvm->lock);
476 kvm_mmu_reset_context(vcpu);
477 spin_unlock(&vcpu->kvm->lock);
478 return;
479}
480EXPORT_SYMBOL_GPL(set_cr0);
481
482void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
483{
399badf3 484 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 485 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
486}
487EXPORT_SYMBOL_GPL(lmsw);
488
489void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
490{
491 if (cr4 & CR4_RESEVED_BITS) {
492 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
493 inject_gp(vcpu);
494 return;
495 }
496
a9058ecd 497 if (is_long_mode(vcpu)) {
6aa8b732
AK		 498 if (!(cr4 & CR4_PAE_MASK)) {
499 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
500 "in long mode\n");
501 inject_gp(vcpu);
502 return;
503 }
504 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
1342d353 505 && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 506 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
507 inject_gp(vcpu);
508 }
509
510 if (cr4 & CR4_VMXE_MASK) {
511 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
512 inject_gp(vcpu);
513 return;
514 }
515 kvm_arch_ops->set_cr4(vcpu, cr4);
516 spin_lock(&vcpu->kvm->lock);
517 kvm_mmu_reset_context(vcpu);
518 spin_unlock(&vcpu->kvm->lock);
519}
520EXPORT_SYMBOL_GPL(set_cr4);
521
522void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
523{
a9058ecd 524 if (is_long_mode(vcpu)) {
d27d4aca 525 if (cr3 & CR3_L_MODE_RESEVED_BITS) {
6aa8b732
AK		 526 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
527 inject_gp(vcpu);
528 return;
529 }
530 } else {
531 if (cr3 & CR3_RESEVED_BITS) {
532 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
533 inject_gp(vcpu);
534 return;
535 }
536 if (is_paging(vcpu) && is_pae(vcpu) &&
1342d353 537 !load_pdptrs(vcpu, cr3)) {
6aa8b732
AK		 538 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
539 "reserved bits\n");
540 inject_gp(vcpu);
541 return;
542 }
543 }
544
545 vcpu->cr3 = cr3;
546 spin_lock(&vcpu->kvm->lock);
d21225ee
IM		 547 /*
548 * Does the new cr3 value map to physical memory? (Note, we
549 * catch an invalid cr3 even in real-mode, because it would
550 * cause trouble later on when we turn on paging anyway.)
551 *
552 * A real CPU would silently accept an invalid cr3 and would
553 * attempt to use it - with largely undefined (and often hard
554 * to debug) behavior on the guest side.
555 */
556 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
557 inject_gp(vcpu);
558 else
559 vcpu->mmu.new_cr3(vcpu);
6aa8b732
AK		 560 spin_unlock(&vcpu->kvm->lock);
561}
562EXPORT_SYMBOL_GPL(set_cr3);
563
564void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
565{
566 if ( cr8 & CR8_RESEVED_BITS) {
567 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
568 inject_gp(vcpu);
569 return;
570 }
571 vcpu->cr8 = cr8;
572}
573EXPORT_SYMBOL_GPL(set_cr8);
574
575void fx_init(struct kvm_vcpu *vcpu)
576{
577 struct __attribute__ ((__packed__)) fx_image_s {
578 u16 control; //fcw
579 u16 status; //fsw
580 u16 tag; // ftw
581 u16 opcode; //fop
582 u64 ip; // fpu ip
583 u64 operand;// fpu dp
584 u32 mxcsr;
585 u32 mxcsr_mask;
586
587 } *fx_image;
588
589 fx_save(vcpu->host_fx_image);
590 fpu_init();
591 fx_save(vcpu->guest_fx_image);
592 fx_restore(vcpu->host_fx_image);
593
594 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
595 fx_image->mxcsr = 0x1f80;
596 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
597 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
598}
599EXPORT_SYMBOL_GPL(fx_init);
600
601/*
602 * Creates some virtual cpus. Good luck creating more than one.
603 */
604static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
605{
606 int r;
607 struct kvm_vcpu *vcpu;
608
609 r = -EINVAL;
5aacf0ca 610 if (!valid_vcpu(n))
6aa8b732
AK		 611 goto out;
612
613 vcpu = &kvm->vcpus[n];
614
615 mutex_lock(&vcpu->mutex);
616
617 if (vcpu->vmcs) {
618 mutex_unlock(&vcpu->mutex);
619 return -EEXIST;
620 }
621
622 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
623 FX_IMAGE_ALIGN);
624 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
625
6aa8b732
AK		 626 r = kvm_arch_ops->vcpu_create(vcpu);
627 if (r < 0)
628 goto out_free_vcpus;
629
8018c27b
IM		 630 r = kvm_mmu_create(vcpu);
631 if (r < 0)
632 goto out_free_vcpus;
6aa8b732 633
8018c27b
IM		 634 kvm_arch_ops->vcpu_load(vcpu);
635 r = kvm_mmu_setup(vcpu);
6aa8b732 636 if (r >= 0)
8018c27b 637 r = kvm_arch_ops->vcpu_setup(vcpu);
6aa8b732
AK		 638 vcpu_put(vcpu);
639
640 if (r < 0)
641 goto out_free_vcpus;
642
643 return 0;
644
645out_free_vcpus:
646 kvm_free_vcpu(vcpu);
647 mutex_unlock(&vcpu->mutex);
648out:
649 return r;
650}
651
652/*
653 * Allocate some memory and give it an address in the guest physical address
654 * space.
655 *
656 * Discontiguous memory is allowed, mostly for framebuffers.
657 */
658static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm,
659 struct kvm_memory_region *mem)
660{
661 int r;
662 gfn_t base_gfn;
663 unsigned long npages;
664 unsigned long i;
665 struct kvm_memory_slot *memslot;
666 struct kvm_memory_slot old, new;
667 int memory_config_version;
668
669 r = -EINVAL;
670 /* General sanity checks */
671 if (mem->memory_size & (PAGE_SIZE - 1))
672 goto out;
673 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
674 goto out;
675 if (mem->slot >= KVM_MEMORY_SLOTS)
676 goto out;
677 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
678 goto out;
679
680 memslot = &kvm->memslots[mem->slot];
681 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
682 npages = mem->memory_size >> PAGE_SHIFT;
683
684 if (!npages)
685 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
686
687raced:
688 spin_lock(&kvm->lock);
689
690 memory_config_version = kvm->memory_config_version;
691 new = old = *memslot;
692
693 new.base_gfn = base_gfn;
694 new.npages = npages;
695 new.flags = mem->flags;
696
697 /* Disallow changing a memory slot's size. */
698 r = -EINVAL;
699 if (npages && old.npages && npages != old.npages)
700 goto out_unlock;
701
702 /* Check for overlaps */
703 r = -EEXIST;
704 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
705 struct kvm_memory_slot *s = &kvm->memslots[i];
706
707 if (s == memslot)
708 continue;
709 if (!((base_gfn + npages <= s->base_gfn) ||
710 (base_gfn >= s->base_gfn + s->npages)))
711 goto out_unlock;
712 }
713 /*
714 * Do memory allocations outside lock. memory_config_version will
715 * detect any races.
716 */
717 spin_unlock(&kvm->lock);
718
719 /* Deallocate if slot is being removed */
720 if (!npages)
8b6d44c7 721 new.phys_mem = NULL;
6aa8b732
AK		 722
723 /* Free page dirty bitmap if unneeded */
724 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
8b6d44c7 725 new.dirty_bitmap = NULL;
6aa8b732
AK		 726
727 r = -ENOMEM;
728
729 /* Allocate if a slot is being created */
730 if (npages && !new.phys_mem) {
731 new.phys_mem = vmalloc(npages * sizeof(struct page *));
732
733 if (!new.phys_mem)
734 goto out_free;
735
736 memset(new.phys_mem, 0, npages * sizeof(struct page *));
737 for (i = 0; i < npages; ++i) {
738 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
739 | __GFP_ZERO);
740 if (!new.phys_mem[i])
741 goto out_free;
5972e953 742 set_page_private(new.phys_mem[i],0);
6aa8b732
AK		 743 }
744 }
745
746 /* Allocate page dirty bitmap if needed */
747 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
748 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
749
750 new.dirty_bitmap = vmalloc(dirty_bytes);
751 if (!new.dirty_bitmap)
752 goto out_free;
753 memset(new.dirty_bitmap, 0, dirty_bytes);
754 }
755
756 spin_lock(&kvm->lock);
757
758 if (memory_config_version != kvm->memory_config_version) {
759 spin_unlock(&kvm->lock);
760 kvm_free_physmem_slot(&new, &old);
761 goto raced;
762 }
763
764 r = -EAGAIN;
765 if (kvm->busy)
766 goto out_unlock;
767
768 if (mem->slot >= kvm->nmemslots)
769 kvm->nmemslots = mem->slot + 1;
770
771 *memslot = new;
772 ++kvm->memory_config_version;
773
774 spin_unlock(&kvm->lock);
775
776 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
777 struct kvm_vcpu *vcpu;
778
779 vcpu = vcpu_load(kvm, i);
780 if (!vcpu)
781 continue;
782 kvm_mmu_reset_context(vcpu);
783 vcpu_put(vcpu);
784 }
785
786 kvm_free_physmem_slot(&old, &new);
787 return 0;
788
789out_unlock:
790 spin_unlock(&kvm->lock);
791out_free:
792 kvm_free_physmem_slot(&new, &old);
793out:
794 return r;
795}
796
714b93da
AK		 797static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
798{
799 spin_lock(&vcpu->kvm->lock);
800 kvm_mmu_slot_remove_write_access(vcpu, slot);
801 spin_unlock(&vcpu->kvm->lock);
802}
803
6aa8b732
AK		 804/*
805 * Get (and clear) the dirty memory log for a memory slot.
806 */
807static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
808 struct kvm_dirty_log *log)
809{
810 struct kvm_memory_slot *memslot;
811 int r, i;
812 int n;
714b93da 813 int cleared;
6aa8b732
AK		 814 unsigned long any = 0;
815
816 spin_lock(&kvm->lock);
817
818 /*
819 * Prevent changes to guest memory configuration even while the lock
820 * is not taken.
821 */
822 ++kvm->busy;
823 spin_unlock(&kvm->lock);
824 r = -EINVAL;
825 if (log->slot >= KVM_MEMORY_SLOTS)
826 goto out;
827
828 memslot = &kvm->memslots[log->slot];
829 r = -ENOENT;
830 if (!memslot->dirty_bitmap)
831 goto out;
832
833 n = ALIGN(memslot->npages, 8) / 8;
834
835 for (i = 0; !any && i < n; ++i)
836 any = memslot->dirty_bitmap[i];
837
838 r = -EFAULT;
839 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
840 goto out;
841
6aa8b732 842 if (any) {
714b93da 843 cleared = 0;
6aa8b732
AK		 844 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
845 struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
846
847 if (!vcpu)
848 continue;
714b93da
AK		 849 if (!cleared) {
850 do_remove_write_access(vcpu, log->slot);
851 memset(memslot->dirty_bitmap, 0, n);
852 cleared = 1;
853 }
6aa8b732
AK		 854 kvm_arch_ops->tlb_flush(vcpu);
855 vcpu_put(vcpu);
856 }
857 }
858
859 r = 0;
860
861out:
862 spin_lock(&kvm->lock);
863 --kvm->busy;
864 spin_unlock(&kvm->lock);
865 return r;
866}
867
868struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
869{
870 int i;
871
872 for (i = 0; i < kvm->nmemslots; ++i) {
873 struct kvm_memory_slot *memslot = &kvm->memslots[i];
874
875 if (gfn >= memslot->base_gfn
876 && gfn < memslot->base_gfn + memslot->npages)
877 return memslot;
878 }
8b6d44c7 879 return NULL;
6aa8b732
AK		 880}
881EXPORT_SYMBOL_GPL(gfn_to_memslot);
882
883void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
884{
885 int i;
8b6d44c7 886 struct kvm_memory_slot *memslot = NULL;
6aa8b732
AK		 887 unsigned long rel_gfn;
888
889 for (i = 0; i < kvm->nmemslots; ++i) {
890 memslot = &kvm->memslots[i];
891
892 if (gfn >= memslot->base_gfn
893 && gfn < memslot->base_gfn + memslot->npages) {
894
895 if (!memslot || !memslot->dirty_bitmap)
896 return;
897
898 rel_gfn = gfn - memslot->base_gfn;
899
900 /* avoid RMW */
901 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
902 set_bit(rel_gfn, memslot->dirty_bitmap);
903 return;
904 }
905 }
906}
907
908static int emulator_read_std(unsigned long addr,
909 unsigned long *val,
910 unsigned int bytes,
911 struct x86_emulate_ctxt *ctxt)
912{
913 struct kvm_vcpu *vcpu = ctxt->vcpu;
914 void *data = val;
915
916 while (bytes) {
917 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
918 unsigned offset = addr & (PAGE_SIZE-1);
919 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
920 unsigned long pfn;
921 struct kvm_memory_slot *memslot;
922 void *page;
923
924 if (gpa == UNMAPPED_GVA)
925 return X86EMUL_PROPAGATE_FAULT;
926 pfn = gpa >> PAGE_SHIFT;
927 memslot = gfn_to_memslot(vcpu->kvm, pfn);
928 if (!memslot)
929 return X86EMUL_UNHANDLEABLE;
930 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
931
932 memcpy(data, page + offset, tocopy);
933
934 kunmap_atomic(page, KM_USER0);
935
936 bytes -= tocopy;
937 data += tocopy;
938 addr += tocopy;
939 }
940
941 return X86EMUL_CONTINUE;
942}
943
944static int emulator_write_std(unsigned long addr,
945 unsigned long val,
946 unsigned int bytes,
947 struct x86_emulate_ctxt *ctxt)
948{
949 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
950 addr, bytes);
951 return X86EMUL_UNHANDLEABLE;
952}
953
954static int emulator_read_emulated(unsigned long addr,
955 unsigned long *val,
956 unsigned int bytes,
957 struct x86_emulate_ctxt *ctxt)
958{
959 struct kvm_vcpu *vcpu = ctxt->vcpu;
960
961 if (vcpu->mmio_read_completed) {
962 memcpy(val, vcpu->mmio_data, bytes);
963 vcpu->mmio_read_completed = 0;
964 return X86EMUL_CONTINUE;
965 } else if (emulator_read_std(addr, val, bytes, ctxt)
966 == X86EMUL_CONTINUE)
967 return X86EMUL_CONTINUE;
968 else {
969 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
d27d4aca 970
6aa8b732 971 if (gpa == UNMAPPED_GVA)
d27d4aca 972 return X86EMUL_PROPAGATE_FAULT;
6aa8b732
AK		 973 vcpu->mmio_needed = 1;
974 vcpu->mmio_phys_addr = gpa;
975 vcpu->mmio_size = bytes;
976 vcpu->mmio_is_write = 0;
977
978 return X86EMUL_UNHANDLEABLE;
979 }
980}
981
da4a00f0
AK		 982static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
983 unsigned long val, int bytes)
984{
985 struct kvm_memory_slot *m;
986 struct page *page;
987 void *virt;
988
989 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
990 return 0;
991 m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
992 if (!m)
993 return 0;
994 page = gfn_to_page(m, gpa >> PAGE_SHIFT);
995 kvm_mmu_pre_write(vcpu, gpa, bytes);
996 virt = kmap_atomic(page, KM_USER0);
997 memcpy(virt + offset_in_page(gpa), &val, bytes);
998 kunmap_atomic(virt, KM_USER0);
999 kvm_mmu_post_write(vcpu, gpa, bytes);
1000 return 1;
1001}
1002
6aa8b732
AK		 1003static int emulator_write_emulated(unsigned long addr,
1004 unsigned long val,
1005 unsigned int bytes,
1006 struct x86_emulate_ctxt *ctxt)
1007{
1008 struct kvm_vcpu *vcpu = ctxt->vcpu;
1009 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1010
1011 if (gpa == UNMAPPED_GVA)
1012 return X86EMUL_PROPAGATE_FAULT;
1013
da4a00f0
AK		 1014 if (emulator_write_phys(vcpu, gpa, val, bytes))
1015 return X86EMUL_CONTINUE;
1016
6aa8b732
AK		 1017 vcpu->mmio_needed = 1;
1018 vcpu->mmio_phys_addr = gpa;
1019 vcpu->mmio_size = bytes;
1020 vcpu->mmio_is_write = 1;
1021 memcpy(vcpu->mmio_data, &val, bytes);
1022
1023 return X86EMUL_CONTINUE;
1024}
1025
1026static int emulator_cmpxchg_emulated(unsigned long addr,
1027 unsigned long old,
1028 unsigned long new,
1029 unsigned int bytes,
1030 struct x86_emulate_ctxt *ctxt)
1031{
1032 static int reported;
1033
1034 if (!reported) {
1035 reported = 1;
1036 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1037 }
1038 return emulator_write_emulated(addr, new, bytes, ctxt);
1039}
1040
32b35627
AK		 1041#ifdef CONFIG_X86_32
1042
1043static int emulator_cmpxchg8b_emulated(unsigned long addr,
1044 unsigned long old_lo,
1045 unsigned long old_hi,
1046 unsigned long new_lo,
1047 unsigned long new_hi,
1048 struct x86_emulate_ctxt *ctxt)
1049{
1050 static int reported;
1051 int r;
1052
1053 if (!reported) {
1054 reported = 1;
1055 printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
1056 }
1057 r = emulator_write_emulated(addr, new_lo, 4, ctxt);
1058 if (r != X86EMUL_CONTINUE)
1059 return r;
1060 return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
1061}
1062
1063#endif
1064
6aa8b732
AK		 1065static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1066{
1067 return kvm_arch_ops->get_segment_base(vcpu, seg);
1068}
1069
1070int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1071{
6aa8b732
AK		 1072 return X86EMUL_CONTINUE;
1073}
1074
1075int emulate_clts(struct kvm_vcpu *vcpu)
1076{
399badf3 1077 unsigned long cr0;
6aa8b732 1078
399badf3
AK		 1079 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1080 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
6aa8b732
AK		 1081 kvm_arch_ops->set_cr0(vcpu, cr0);
1082 return X86EMUL_CONTINUE;
1083}
1084
1085int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1086{
1087 struct kvm_vcpu *vcpu = ctxt->vcpu;
1088
1089 switch (dr) {
1090 case 0 ... 3:
1091 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1092 return X86EMUL_CONTINUE;
1093 default:
1094 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1095 __FUNCTION__, dr);
1096 return X86EMUL_UNHANDLEABLE;
1097 }
1098}
1099
1100int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1101{
1102 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1103 int exception;
1104
1105 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1106 if (exception) {
1107 /* FIXME: better handling */
1108 return X86EMUL_UNHANDLEABLE;
1109 }
1110 return X86EMUL_CONTINUE;
1111}
1112
1113static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1114{
1115 static int reported;
1116 u8 opcodes[4];
1117 unsigned long rip = ctxt->vcpu->rip;
1118 unsigned long rip_linear;
1119
1120 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1121
1122 if (reported)
1123 return;
1124
1125 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1126
1127 printk(KERN_ERR "emulation failed but !mmio_needed?"
1128 " rip %lx %02x %02x %02x %02x\n",
1129 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1130 reported = 1;
1131}
1132
1133struct x86_emulate_ops emulate_ops = {
1134 .read_std = emulator_read_std,
1135 .write_std = emulator_write_std,
1136 .read_emulated = emulator_read_emulated,
1137 .write_emulated = emulator_write_emulated,
1138 .cmpxchg_emulated = emulator_cmpxchg_emulated,
32b35627
AK		 1139#ifdef CONFIG_X86_32
1140 .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated,
1141#endif
6aa8b732
AK		 1142};
1143
1144int emulate_instruction(struct kvm_vcpu *vcpu,
1145 struct kvm_run *run,
1146 unsigned long cr2,
1147 u16 error_code)
1148{
1149 struct x86_emulate_ctxt emulate_ctxt;
1150 int r;
1151 int cs_db, cs_l;
1152
1153 kvm_arch_ops->cache_regs(vcpu);
1154
1155 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1156
1157 emulate_ctxt.vcpu = vcpu;
1158 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1159 emulate_ctxt.cr2 = cr2;
1160 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1161 ? X86EMUL_MODE_REAL : cs_l
1162 ? X86EMUL_MODE_PROT64 : cs_db
1163 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1164
1165 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1166 emulate_ctxt.cs_base = 0;
1167 emulate_ctxt.ds_base = 0;
1168 emulate_ctxt.es_base = 0;
1169 emulate_ctxt.ss_base = 0;
1170 } else {
1171 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1172 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1173 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1174 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1175 }
1176
1177 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1178 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1179
1180 vcpu->mmio_is_write = 0;
1181 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1182
1183 if ((r || vcpu->mmio_is_write) && run) {
1184 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1185 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1186 run->mmio.len = vcpu->mmio_size;
1187 run->mmio.is_write = vcpu->mmio_is_write;
1188 }
1189
1190 if (r) {
a436036b
AK		 1191 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1192 return EMULATE_DONE;
6aa8b732
AK		 1193 if (!vcpu->mmio_needed) {
1194 report_emulation_failure(&emulate_ctxt);
1195 return EMULATE_FAIL;
1196 }
1197 return EMULATE_DO_MMIO;
1198 }
1199
1200 kvm_arch_ops->decache_regs(vcpu);
1201 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1202
1203 if (vcpu->mmio_is_write)
1204 return EMULATE_DO_MMIO;
1205
1206 return EMULATE_DONE;
1207}
1208EXPORT_SYMBOL_GPL(emulate_instruction);
1209
270fd9b9
AK		 1210int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1211{
1212 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1213
1214 kvm_arch_ops->decache_regs(vcpu);
1215 ret = -KVM_EINVAL;
1216#ifdef CONFIG_X86_64
1217 if (is_long_mode(vcpu)) {
1218 nr = vcpu->regs[VCPU_REGS_RAX];
1219 a0 = vcpu->regs[VCPU_REGS_RDI];
1220 a1 = vcpu->regs[VCPU_REGS_RSI];
1221 a2 = vcpu->regs[VCPU_REGS_RDX];
1222 a3 = vcpu->regs[VCPU_REGS_RCX];
1223 a4 = vcpu->regs[VCPU_REGS_R8];
1224 a5 = vcpu->regs[VCPU_REGS_R9];
1225 } else
1226#endif
1227 {
1228 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1229 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1230 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1231 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1232 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1233 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1234 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1235 }
1236 switch (nr) {
1237 default:
1238 ;
1239 }
1240 vcpu->regs[VCPU_REGS_RAX] = ret;
1241 kvm_arch_ops->cache_regs(vcpu);
1242 return 1;
1243}
1244EXPORT_SYMBOL_GPL(kvm_hypercall);
1245
6aa8b732
AK		 1246static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1247{
1248 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1249}
1250
1251void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1252{
1253 struct descriptor_table dt = { limit, base };
1254
1255 kvm_arch_ops->set_gdt(vcpu, &dt);
1256}
1257
1258void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1259{
1260 struct descriptor_table dt = { limit, base };
1261
1262 kvm_arch_ops->set_idt(vcpu, &dt);
1263}
1264
1265void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1266 unsigned long *rflags)
1267{
1268 lmsw(vcpu, msw);
1269 *rflags = kvm_arch_ops->get_rflags(vcpu);
1270}
1271
1272unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1273{
399badf3 1274 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1275 switch (cr) {
1276 case 0:
1277 return vcpu->cr0;
1278 case 2:
1279 return vcpu->cr2;
1280 case 3:
1281 return vcpu->cr3;
1282 case 4:
1283 return vcpu->cr4;
1284 default:
1285 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1286 return 0;
1287 }
1288}
1289
1290void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1291 unsigned long *rflags)
1292{
1293 switch (cr) {
1294 case 0:
1295 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1296 *rflags = kvm_arch_ops->get_rflags(vcpu);
1297 break;
1298 case 2:
1299 vcpu->cr2 = val;
1300 break;
1301 case 3:
1302 set_cr3(vcpu, val);
1303 break;
1304 case 4:
1305 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1306 break;
1307 default:
1308 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1309 }
1310}
1311
102d8325
IM		 1312/*
1313 * Register the para guest with the host:
1314 */
1315static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1316{
1317 struct kvm_vcpu_para_state *para_state;
1318 hpa_t para_state_hpa, hypercall_hpa;
1319 struct page *para_state_page;
1320 unsigned char *hypercall;
1321 gpa_t hypercall_gpa;
1322
1323 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1324 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1325
1326 /*
1327 * Needs to be page aligned:
1328 */
1329 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1330 goto err_gp;
1331
1332 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1333 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1334 if (is_error_hpa(para_state_hpa))
1335 goto err_gp;
1336
1337 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1338 para_state = kmap_atomic(para_state_page, KM_USER0);
1339
1340 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1341 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1342
1343 para_state->host_version = KVM_PARA_API_VERSION;
1344 /*
1345 * We cannot support guests that try to register themselves
1346 * with a newer API version than the host supports:
1347 */
1348 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1349 para_state->ret = -KVM_EINVAL;
1350 goto err_kunmap_skip;
1351 }
1352
1353 hypercall_gpa = para_state->hypercall_gpa;
1354 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1355 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1356 if (is_error_hpa(hypercall_hpa)) {
1357 para_state->ret = -KVM_EINVAL;
1358 goto err_kunmap_skip;
1359 }
1360
1361 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1362 vcpu->para_state_page = para_state_page;
1363 vcpu->para_state_gpa = para_state_gpa;
1364 vcpu->hypercall_gpa = hypercall_gpa;
1365
1366 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1367 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1368 kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1369 kunmap_atomic(hypercall, KM_USER1);
1370
1371 para_state->ret = 0;
1372err_kunmap_skip:
1373 kunmap_atomic(para_state, KM_USER0);
1374 return 0;
1375err_gp:
1376 return 1;
1377}
1378
3bab1f5d
AK		 1379int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1380{
1381 u64 data;
1382
1383 switch (msr) {
1384 case 0xc0010010: /* SYSCFG */
1385 case 0xc0010015: /* HWCR */
1386 case MSR_IA32_PLATFORM_ID:
1387 case MSR_IA32_P5_MC_ADDR:
1388 case MSR_IA32_P5_MC_TYPE:
1389 case MSR_IA32_MC0_CTL:
1390 case MSR_IA32_MCG_STATUS:
1391 case MSR_IA32_MCG_CAP:
1392 case MSR_IA32_MC0_MISC:
1393 case MSR_IA32_MC0_MISC+4:
1394 case MSR_IA32_MC0_MISC+8:
1395 case MSR_IA32_MC0_MISC+12:
1396 case MSR_IA32_MC0_MISC+16:
1397 case MSR_IA32_UCODE_REV:
a8d13ea2 1398 case MSR_IA32_PERF_STATUS:
3bab1f5d
AK		 1399 /* MTRR registers */
1400 case 0xfe:
1401 case 0x200 ... 0x2ff:
1402 data = 0;
1403 break;
a8d13ea2
AK		 1404 case 0xcd: /* fsb frequency */
1405 data = 3;
1406 break;
3bab1f5d
AK		 1407 case MSR_IA32_APICBASE:
1408 data = vcpu->apic_base;
1409 break;
6f00e68f
AK		 1410 case MSR_IA32_MISC_ENABLE:
1411 data = vcpu->ia32_misc_enable_msr;
1412 break;
3bab1f5d
AK		 1413#ifdef CONFIG_X86_64
1414 case MSR_EFER:
1415 data = vcpu->shadow_efer;
1416 break;
1417#endif
1418 default:
1419 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1420 return 1;
1421 }
1422 *pdata = data;
1423 return 0;
1424}
1425EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1426
6aa8b732
AK		 1427/*
1428 * Reads an msr value (of 'msr_index') into 'pdata'.
1429 * Returns 0 on success, non-0 otherwise.
1430 * Assumes vcpu_load() was already called.
1431 */
1432static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1433{
1434 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1435}
1436
05b3e0c2 1437#ifdef CONFIG_X86_64
6aa8b732 1438
3bab1f5d 1439static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1440{
6aa8b732
AK		 1441 if (efer & EFER_RESERVED_BITS) {
1442 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1443 efer);
1444 inject_gp(vcpu);
1445 return;
1446 }
1447
1448 if (is_paging(vcpu)
1449 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1450 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1451 inject_gp(vcpu);
1452 return;
1453 }
1454
7725f0ba
AK		 1455 kvm_arch_ops->set_efer(vcpu, efer);
1456
6aa8b732
AK		 1457 efer &= ~EFER_LMA;
1458 efer |= vcpu->shadow_efer & EFER_LMA;
1459
1460 vcpu->shadow_efer = efer;
6aa8b732 1461}
6aa8b732
AK		 1462
1463#endif
1464
3bab1f5d
AK		 1465int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1466{
1467 switch (msr) {
1468#ifdef CONFIG_X86_64
1469 case MSR_EFER:
1470 set_efer(vcpu, data);
1471 break;
1472#endif
1473 case MSR_IA32_MC0_STATUS:
1474 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1475 __FUNCTION__, data);
1476 break;
1477 case MSR_IA32_UCODE_REV:
1478 case MSR_IA32_UCODE_WRITE:
1479 case 0x200 ... 0x2ff: /* MTRRs */
1480 break;
1481 case MSR_IA32_APICBASE:
1482 vcpu->apic_base = data;
1483 break;
6f00e68f
AK		 1484 case MSR_IA32_MISC_ENABLE:
1485 vcpu->ia32_misc_enable_msr = data;
1486 break;
102d8325
IM		 1487 /*
1488 * This is the 'probe whether the host is KVM' logic:
1489 */
1490 case MSR_KVM_API_MAGIC:
1491 return vcpu_register_para(vcpu, data);
1492
3bab1f5d
AK		 1493 default:
1494 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1495 return 1;
1496 }
1497 return 0;
1498}
1499EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1500
6aa8b732
AK		 1501/*
1502 * Writes msr value into into the appropriate "register".
1503 * Returns 0 on success, non-0 otherwise.
1504 * Assumes vcpu_load() was already called.
1505 */
1506static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1507{
1508 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1509}
1510
1511void kvm_resched(struct kvm_vcpu *vcpu)
1512{
1513 vcpu_put(vcpu);
1514 cond_resched();
1515 /* Cannot fail - no vcpu unplug yet. */
1516 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1517}
1518EXPORT_SYMBOL_GPL(kvm_resched);
1519
1520void load_msrs(struct vmx_msr_entry *e, int n)
1521{
1522 int i;
1523
1524 for (i = 0; i < n; ++i)
1525 wrmsrl(e[i].index, e[i].data);
1526}
1527EXPORT_SYMBOL_GPL(load_msrs);
1528
1529void save_msrs(struct vmx_msr_entry *e, int n)
1530{
1531 int i;
1532
1533 for (i = 0; i < n; ++i)
1534 rdmsrl(e[i].index, e[i].data);
1535}
1536EXPORT_SYMBOL_GPL(save_msrs);
1537
1538static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1539{
1540 struct kvm_vcpu *vcpu;
1541 int r;
1542
5aacf0ca 1543 if (!valid_vcpu(kvm_run->vcpu))
6aa8b732
AK		 1544 return -EINVAL;
1545
1546 vcpu = vcpu_load(kvm, kvm_run->vcpu);
1547 if (!vcpu)
1548 return -ENOENT;
1549
54810342
DL		 1550 /* re-sync apic's tpr */
1551 vcpu->cr8 = kvm_run->cr8;
1552
6aa8b732
AK		 1553 if (kvm_run->emulated) {
1554 kvm_arch_ops->skip_emulated_instruction(vcpu);
1555 kvm_run->emulated = 0;
1556 }
1557
1558 if (kvm_run->mmio_completed) {
1559 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1560 vcpu->mmio_read_completed = 1;
1561 }
1562
1563 vcpu->mmio_needed = 0;
1564
1565 r = kvm_arch_ops->run(vcpu, kvm_run);
1566
1567 vcpu_put(vcpu);
1568 return r;
1569}
1570
1571static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1572{
1573 struct kvm_vcpu *vcpu;
1574
5aacf0ca 1575 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1576 return -EINVAL;
1577
1578 vcpu = vcpu_load(kvm, regs->vcpu);
1579 if (!vcpu)
1580 return -ENOENT;
1581
1582 kvm_arch_ops->cache_regs(vcpu);
1583
1584 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1585 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1586 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1587 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1588 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1589 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1590 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1591 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1592#ifdef CONFIG_X86_64
6aa8b732
AK		 1593 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1594 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1595 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1596 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1597 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1598 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1599 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1600 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1601#endif
1602
1603 regs->rip = vcpu->rip;
1604 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1605
1606 /*
1607 * Don't leak debug flags in case they were set for guest debugging
1608 */
1609 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1610 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1611
1612 vcpu_put(vcpu);
1613
1614 return 0;
1615}
1616
1617static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1618{
1619 struct kvm_vcpu *vcpu;
1620
5aacf0ca 1621 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1622 return -EINVAL;
1623
1624 vcpu = vcpu_load(kvm, regs->vcpu);
1625 if (!vcpu)
1626 return -ENOENT;
1627
1628 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1629 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1630 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1631 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1632 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1633 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1634 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1635 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1636#ifdef CONFIG_X86_64
6aa8b732
AK		 1637 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1638 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1639 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1640 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1641 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1642 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1643 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1644 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1645#endif
1646
1647 vcpu->rip = regs->rip;
1648 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1649
1650 kvm_arch_ops->decache_regs(vcpu);
1651
1652 vcpu_put(vcpu);
1653
1654 return 0;
1655}
1656
1657static void get_segment(struct kvm_vcpu *vcpu,
1658 struct kvm_segment *var, int seg)
1659{
1660 return kvm_arch_ops->get_segment(vcpu, var, seg);
1661}
1662
1663static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1664{
1665 struct kvm_vcpu *vcpu;
1666 struct descriptor_table dt;
1667
5aacf0ca 1668 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1669 return -EINVAL;
1670 vcpu = vcpu_load(kvm, sregs->vcpu);
1671 if (!vcpu)
1672 return -ENOENT;
1673
1674 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1675 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1676 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1677 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1678 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1679 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1680
1681 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1682 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1683
1684 kvm_arch_ops->get_idt(vcpu, &dt);
1685 sregs->idt.limit = dt.limit;
1686 sregs->idt.base = dt.base;
1687 kvm_arch_ops->get_gdt(vcpu, &dt);
1688 sregs->gdt.limit = dt.limit;
1689 sregs->gdt.base = dt.base;
1690
399badf3 1691 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1692 sregs->cr0 = vcpu->cr0;
1693 sregs->cr2 = vcpu->cr2;
1694 sregs->cr3 = vcpu->cr3;
1695 sregs->cr4 = vcpu->cr4;
1696 sregs->cr8 = vcpu->cr8;
1697 sregs->efer = vcpu->shadow_efer;
1698 sregs->apic_base = vcpu->apic_base;
1699
1700 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1701 sizeof sregs->interrupt_bitmap);
1702
1703 vcpu_put(vcpu);
1704
1705 return 0;
1706}
1707
1708static void set_segment(struct kvm_vcpu *vcpu,
1709 struct kvm_segment *var, int seg)
1710{
1711 return kvm_arch_ops->set_segment(vcpu, var, seg);
1712}
1713
1714static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1715{
1716 struct kvm_vcpu *vcpu;
1717 int mmu_reset_needed = 0;
1718 int i;
1719 struct descriptor_table dt;
1720
5aacf0ca 1721 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1722 return -EINVAL;
1723 vcpu = vcpu_load(kvm, sregs->vcpu);
1724 if (!vcpu)
1725 return -ENOENT;
1726
1727 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1728 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1729 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1730 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1731 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1732 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1733
1734 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1735 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1736
1737 dt.limit = sregs->idt.limit;
1738 dt.base = sregs->idt.base;
1739 kvm_arch_ops->set_idt(vcpu, &dt);
1740 dt.limit = sregs->gdt.limit;
1741 dt.base = sregs->gdt.base;
1742 kvm_arch_ops->set_gdt(vcpu, &dt);
1743
1744 vcpu->cr2 = sregs->cr2;
1745 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1746 vcpu->cr3 = sregs->cr3;
1747
1748 vcpu->cr8 = sregs->cr8;
1749
1750 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 1751#ifdef CONFIG_X86_64
6aa8b732
AK		 1752 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1753#endif
1754 vcpu->apic_base = sregs->apic_base;
1755
399badf3
AK		 1756 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1757
6aa8b732
AK		 1758 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1759 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1760
1761 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1762 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 1763 if (!is_long_mode(vcpu) && is_pae(vcpu))
1764 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 1765
1766 if (mmu_reset_needed)
1767 kvm_mmu_reset_context(vcpu);
1768
1769 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1770 sizeof vcpu->irq_pending);
1771 vcpu->irq_summary = 0;
1772 for (i = 0; i < NR_IRQ_WORDS; ++i)
1773 if (vcpu->irq_pending[i])
1774 __set_bit(i, &vcpu->irq_summary);
1775
1776 vcpu_put(vcpu);
1777
1778 return 0;
1779}
1780
1781/*
1782 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1783 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 1784 *
1785 * This list is modified at module load time to reflect the
1786 * capabilities of the host cpu.
6aa8b732
AK		 1787 */
1788static u32 msrs_to_save[] = {
1789 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1790 MSR_K6_STAR,
05b3e0c2 1791#ifdef CONFIG_X86_64
6aa8b732
AK		 1792 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1793#endif
1794 MSR_IA32_TIME_STAMP_COUNTER,
1795};
1796
bf591b24
MR		 1797static unsigned num_msrs_to_save;
1798
6f00e68f
AK		 1799static u32 emulated_msrs[] = {
1800 MSR_IA32_MISC_ENABLE,
1801};
1802
bf591b24
MR		 1803static __init void kvm_init_msr_list(void)
1804{
1805 u32 dummy[2];
1806 unsigned i, j;
1807
1808 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1809 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1810 continue;
1811 if (j < i)
1812 msrs_to_save[j] = msrs_to_save[i];
1813 j++;
1814 }
1815 num_msrs_to_save = j;
1816}
6aa8b732
AK		 1817
1818/*
1819 * Adapt set_msr() to msr_io()'s calling convention
1820 */
1821static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1822{
1823 return set_msr(vcpu, index, *data);
1824}
1825
1826/*
1827 * Read or write a bunch of msrs. All parameters are kernel addresses.
1828 *
1829 * @return number of msrs set successfully.
1830 */
1831static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1832 struct kvm_msr_entry *entries,
1833 int (*do_msr)(struct kvm_vcpu *vcpu,
1834 unsigned index, u64 *data))
1835{
1836 struct kvm_vcpu *vcpu;
1837 int i;
1838
5aacf0ca 1839 if (!valid_vcpu(msrs->vcpu))
6aa8b732
AK		 1840 return -EINVAL;
1841
1842 vcpu = vcpu_load(kvm, msrs->vcpu);
1843 if (!vcpu)
1844 return -ENOENT;
1845
1846 for (i = 0; i < msrs->nmsrs; ++i)
1847 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1848 break;
1849
1850 vcpu_put(vcpu);
1851
1852 return i;
1853}
1854
1855/*
1856 * Read or write a bunch of msrs. Parameters are user addresses.
1857 *
1858 * @return number of msrs set successfully.
1859 */
1860static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1861 int (*do_msr)(struct kvm_vcpu *vcpu,
1862 unsigned index, u64 *data),
1863 int writeback)
1864{
1865 struct kvm_msrs msrs;
1866 struct kvm_msr_entry *entries;
1867 int r, n;
1868 unsigned size;
1869
1870 r = -EFAULT;
1871 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1872 goto out;
1873
1874 r = -E2BIG;
1875 if (msrs.nmsrs >= MAX_IO_MSRS)
1876 goto out;
1877
1878 r = -ENOMEM;
1879 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1880 entries = vmalloc(size);
1881 if (!entries)
1882 goto out;
1883
1884 r = -EFAULT;
1885 if (copy_from_user(entries, user_msrs->entries, size))
1886 goto out_free;
1887
1888 r = n = __msr_io(kvm, &msrs, entries, do_msr);
1889 if (r < 0)
1890 goto out_free;
1891
1892 r = -EFAULT;
1893 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1894 goto out_free;
1895
1896 r = n;
1897
1898out_free:
1899 vfree(entries);
1900out:
1901 return r;
1902}
1903
1904/*
1905 * Translate a guest virtual address to a guest physical address.
1906 */
1907static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1908{
1909 unsigned long vaddr = tr->linear_address;
1910 struct kvm_vcpu *vcpu;
1911 gpa_t gpa;
1912
1913 vcpu = vcpu_load(kvm, tr->vcpu);
1914 if (!vcpu)
1915 return -ENOENT;
1916 spin_lock(&kvm->lock);
1917 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1918 tr->physical_address = gpa;
1919 tr->valid = gpa != UNMAPPED_GVA;
1920 tr->writeable = 1;
1921 tr->usermode = 0;
1922 spin_unlock(&kvm->lock);
1923 vcpu_put(vcpu);
1924
1925 return 0;
1926}
1927
1928static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1929{
1930 struct kvm_vcpu *vcpu;
1931
5aacf0ca 1932 if (!valid_vcpu(irq->vcpu))
6aa8b732
AK		 1933 return -EINVAL;
1934 if (irq->irq < 0 || irq->irq >= 256)
1935 return -EINVAL;
1936 vcpu = vcpu_load(kvm, irq->vcpu);
1937 if (!vcpu)
1938 return -ENOENT;
1939
1940 set_bit(irq->irq, vcpu->irq_pending);
1941 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1942
1943 vcpu_put(vcpu);
1944
1945 return 0;
1946}
1947
1948static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1949 struct kvm_debug_guest *dbg)
1950{
1951 struct kvm_vcpu *vcpu;
1952 int r;
1953
5aacf0ca 1954 if (!valid_vcpu(dbg->vcpu))
6aa8b732
AK		 1955 return -EINVAL;
1956 vcpu = vcpu_load(kvm, dbg->vcpu);
1957 if (!vcpu)
1958 return -ENOENT;
1959
1960 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1961
1962 vcpu_put(vcpu);
1963
1964 return r;
1965}
1966
f17abe9a
AK		 1967static long kvm_vm_ioctl(struct file *filp,
1968 unsigned int ioctl, unsigned long arg)
6aa8b732
AK		 1969{
1970 struct kvm *kvm = filp->private_data;
2f366987 1971 void __user *argp = (void __user *)arg;
6aa8b732
AK		 1972 int r = -EINVAL;
1973
1974 switch (ioctl) {
d27d4aca 1975 case KVM_CREATE_VCPU:
6aa8b732
AK		 1976 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1977 if (r)
1978 goto out;
1979 break;
6aa8b732
AK		 1980 case KVM_RUN: {
1981 struct kvm_run kvm_run;
1982
1983 r = -EFAULT;
2f366987 1984 if (copy_from_user(&kvm_run, argp, sizeof kvm_run))
6aa8b732
AK		 1985 goto out;
1986 r = kvm_dev_ioctl_run(kvm, &kvm_run);
c1150d8c 1987 if (r < 0 && r != -EINTR)
6aa8b732 1988 goto out;
2f366987 1989 if (copy_to_user(argp, &kvm_run, sizeof kvm_run)) {
c1150d8c 1990 r = -EFAULT;
6aa8b732 1991 goto out;
c1150d8c 1992 }
6aa8b732
AK		 1993 break;
1994 }
1995 case KVM_GET_REGS: {
1996 struct kvm_regs kvm_regs;
1997
1998 r = -EFAULT;
2f366987 1999 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732
AK		 2000 goto out;
2001 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
2002 if (r)
2003 goto out;
2004 r = -EFAULT;
2f366987 2005 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 2006 goto out;
2007 r = 0;
2008 break;
2009 }
2010 case KVM_SET_REGS: {
2011 struct kvm_regs kvm_regs;
2012
2013 r = -EFAULT;
2f366987 2014 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732
AK		 2015 goto out;
2016 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
2017 if (r)
2018 goto out;
2019 r = 0;
2020 break;
2021 }
2022 case KVM_GET_SREGS: {
2023 struct kvm_sregs kvm_sregs;
2024
2025 r = -EFAULT;
2f366987 2026 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732
AK		 2027 goto out;
2028 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
2029 if (r)
2030 goto out;
2031 r = -EFAULT;
2f366987 2032 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 2033 goto out;
2034 r = 0;
2035 break;
2036 }
2037 case KVM_SET_SREGS: {
2038 struct kvm_sregs kvm_sregs;
2039
2040 r = -EFAULT;
2f366987 2041 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732
AK		 2042 goto out;
2043 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
2044 if (r)
2045 goto out;
2046 r = 0;
2047 break;
2048 }
2049 case KVM_TRANSLATE: {
2050 struct kvm_translation tr;
2051
2052 r = -EFAULT;
2f366987 2053 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732
AK		 2054 goto out;
2055 r = kvm_dev_ioctl_translate(kvm, &tr);
2056 if (r)
2057 goto out;
2058 r = -EFAULT;
2f366987 2059 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 2060 goto out;
2061 r = 0;
2062 break;
2063 }
2064 case KVM_INTERRUPT: {
2065 struct kvm_interrupt irq;
2066
2067 r = -EFAULT;
2f366987 2068 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732
AK		 2069 goto out;
2070 r = kvm_dev_ioctl_interrupt(kvm, &irq);
2071 if (r)
2072 goto out;
2073 r = 0;
2074 break;
2075 }
2076 case KVM_DEBUG_GUEST: {
2077 struct kvm_debug_guest dbg;
2078
2079 r = -EFAULT;
2f366987 2080 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732
AK		 2081 goto out;
2082 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
2083 if (r)
2084 goto out;
2085 r = 0;
2086 break;
2087 }
2088 case KVM_SET_MEMORY_REGION: {
2089 struct kvm_memory_region kvm_mem;
2090
2091 r = -EFAULT;
2f366987 2092 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
6aa8b732
AK		 2093 goto out;
2094 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
2095 if (r)
2096 goto out;
2097 break;
2098 }
2099 case KVM_GET_DIRTY_LOG: {
2100 struct kvm_dirty_log log;
2101
2102 r = -EFAULT;
2f366987 2103 if (copy_from_user(&log, argp, sizeof log))
6aa8b732
AK		 2104 goto out;
2105 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
2106 if (r)
2107 goto out;
2108 break;
2109 }
2110 case KVM_GET_MSRS:
2f366987 2111 r = msr_io(kvm, argp, get_msr, 1);
6aa8b732
AK		 2112 break;
2113 case KVM_SET_MSRS:
2f366987 2114 r = msr_io(kvm, argp, do_set_msr, 0);
6aa8b732 2115 break;
f17abe9a
AK		 2116 default:
2117 ;
2118 }
2119out:
2120 return r;
2121}
2122
2123static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2124 unsigned long address,
2125 int *type)
2126{
2127 struct kvm *kvm = vma->vm_file->private_data;
2128 unsigned long pgoff;
2129 struct kvm_memory_slot *slot;
2130 struct page *page;
2131
2132 *type = VM_FAULT_MINOR;
2133 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2134 slot = gfn_to_memslot(kvm, pgoff);
2135 if (!slot)
2136 return NOPAGE_SIGBUS;
2137 page = gfn_to_page(slot, pgoff);
2138 if (!page)
2139 return NOPAGE_SIGBUS;
2140 get_page(page);
2141 return page;
2142}
2143
2144static struct vm_operations_struct kvm_vm_vm_ops = {
2145 .nopage = kvm_vm_nopage,
2146};
2147
2148static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2149{
2150 vma->vm_ops = &kvm_vm_vm_ops;
2151 return 0;
2152}
2153
2154static struct file_operations kvm_vm_fops = {
2155 .release = kvm_vm_release,
2156 .unlocked_ioctl = kvm_vm_ioctl,
2157 .compat_ioctl = kvm_vm_ioctl,
2158 .mmap = kvm_vm_mmap,
2159};
2160
2161static int kvm_dev_ioctl_create_vm(void)
2162{
2163 int fd, r;
2164 struct inode *inode;
2165 struct file *file;
2166 struct kvm *kvm;
2167
2168 inode = kvmfs_inode(&kvm_vm_fops);
2169 if (IS_ERR(inode)) {
2170 r = PTR_ERR(inode);
2171 goto out1;
2172 }
2173
2174 kvm = kvm_create_vm();
2175 if (IS_ERR(kvm)) {
2176 r = PTR_ERR(kvm);
2177 goto out2;
2178 }
2179
2180 file = kvmfs_file(inode, kvm);
2181 if (IS_ERR(file)) {
2182 r = PTR_ERR(file);
2183 goto out3;
2184 }
2185
2186 r = get_unused_fd();
2187 if (r < 0)
2188 goto out4;
2189 fd = r;
2190 fd_install(fd, file);
2191
2192 return fd;
2193
2194out4:
2195 fput(file);
2196out3:
2197 kvm_destroy_vm(kvm);
2198out2:
2199 iput(inode);
2200out1:
2201 return r;
2202}
2203
2204static long kvm_dev_ioctl(struct file *filp,
2205 unsigned int ioctl, unsigned long arg)
2206{
2207 void __user *argp = (void __user *)arg;
2208 int r = -EINVAL;
2209
2210 switch (ioctl) {
2211 case KVM_GET_API_VERSION:
2212 r = KVM_API_VERSION;
2213 break;
2214 case KVM_CREATE_VM:
2215 r = kvm_dev_ioctl_create_vm();
2216 break;
6aa8b732 2217 case KVM_GET_MSR_INDEX_LIST: {
2f366987 2218 struct kvm_msr_list __user *user_msr_list = argp;
6aa8b732
AK		 2219 struct kvm_msr_list msr_list;
2220 unsigned n;
2221
2222 r = -EFAULT;
2223 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2224 goto out;
2225 n = msr_list.nmsrs;
6f00e68f 2226 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
6aa8b732
AK		 2227 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2228 goto out;
2229 r = -E2BIG;
bf591b24 2230 if (n < num_msrs_to_save)
6aa8b732
AK		 2231 goto out;
2232 r = -EFAULT;
2233 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 2234 num_msrs_to_save * sizeof(u32)))
6aa8b732 2235 goto out;
6f00e68f
AK		 2236 if (copy_to_user(user_msr_list->indices
2237 + num_msrs_to_save * sizeof(u32),
2238 &emulated_msrs,
2239 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2240 goto out;
6aa8b732 2241 r = 0;
cc1d8955 2242 break;
6aa8b732
AK		 2243 }
2244 default:
2245 ;
2246 }
2247out:
2248 return r;
2249}
2250
6aa8b732
AK		 2251static struct file_operations kvm_chardev_ops = {
2252 .open = kvm_dev_open,
2253 .release = kvm_dev_release,
2254 .unlocked_ioctl = kvm_dev_ioctl,
2255 .compat_ioctl = kvm_dev_ioctl,
6aa8b732
AK		 2256};
2257
2258static struct miscdevice kvm_dev = {
2259 MISC_DYNAMIC_MINOR,
2260 "kvm",
2261 &kvm_chardev_ops,
2262};
2263
2264static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2265 void *v)
2266{
2267 if (val == SYS_RESTART) {
2268 /*
2269 * Some (well, at least mine) BIOSes hang on reboot if
2270 * in vmx root mode.
2271 */
2272 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
8b6d44c7 2273 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2274 }
2275 return NOTIFY_OK;
2276}
2277
2278static struct notifier_block kvm_reboot_notifier = {
2279 .notifier_call = kvm_reboot,
2280 .priority = 0,
2281};
2282
774c47f1
AK		 2283/*
2284 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2285 * cached on it.
2286 */
2287static void decache_vcpus_on_cpu(int cpu)
2288{
2289 struct kvm *vm;
2290 struct kvm_vcpu *vcpu;
2291 int i;
2292
2293 spin_lock(&kvm_lock);
2294 list_for_each_entry(vm, &vm_list, vm_list)
2295 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2296 vcpu = &vm->vcpus[i];
2297 /*
2298 * If the vcpu is locked, then it is running on some
2299 * other cpu and therefore it is not cached on the
2300 * cpu in question.
2301 *
2302 * If it's not locked, check the last cpu it executed
2303 * on.
2304 */
2305 if (mutex_trylock(&vcpu->mutex)) {
2306 if (vcpu->cpu == cpu) {
2307 kvm_arch_ops->vcpu_decache(vcpu);
2308 vcpu->cpu = -1;
2309 }
2310 mutex_unlock(&vcpu->mutex);
2311 }
2312 }
2313 spin_unlock(&kvm_lock);
2314}
2315
2316static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2317 void *v)
2318{
2319 int cpu = (long)v;
2320
2321 switch (val) {
43934a38 2322 case CPU_DOWN_PREPARE:
774c47f1 2323 case CPU_UP_CANCELED:
43934a38
JK		 2324 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2325 cpu);
774c47f1
AK		 2326 decache_vcpus_on_cpu(cpu);
2327 smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
2328 NULL, 0, 1);
2329 break;
43934a38
JK		 2330 case CPU_ONLINE:
2331 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2332 cpu);
774c47f1
AK		 2333 smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
2334 NULL, 0, 1);
2335 break;
2336 }
2337 return NOTIFY_OK;
2338}
2339
2340static struct notifier_block kvm_cpu_notifier = {
2341 .notifier_call = kvm_cpu_hotplug,
2342 .priority = 20, /* must be > scheduler priority */
2343};
2344
6aa8b732
AK		 2345static __init void kvm_init_debug(void)
2346{
2347 struct kvm_stats_debugfs_item *p;
2348
8b6d44c7 2349 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732
AK		 2350 for (p = debugfs_entries; p->name; ++p)
2351 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
2352 p->data);
2353}
2354
2355static void kvm_exit_debug(void)
2356{
2357 struct kvm_stats_debugfs_item *p;
2358
2359 for (p = debugfs_entries; p->name; ++p)
2360 debugfs_remove(p->dentry);
2361 debugfs_remove(debugfs_dir);
2362}
2363
59ae6c6b
AK		 2364static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2365{
2366 decache_vcpus_on_cpu(raw_smp_processor_id());
19d1408d 2367 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
59ae6c6b
AK		 2368 return 0;
2369}
2370
2371static int kvm_resume(struct sys_device *dev)
2372{
19d1408d 2373 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
59ae6c6b
AK		 2374 return 0;
2375}
2376
2377static struct sysdev_class kvm_sysdev_class = {
2378 set_kset_name("kvm"),
2379 .suspend = kvm_suspend,
2380 .resume = kvm_resume,
2381};
2382
2383static struct sys_device kvm_sysdev = {
2384 .id = 0,
2385 .cls = &kvm_sysdev_class,
2386};
2387
6aa8b732
AK		 2388hpa_t bad_page_address;
2389
37e29d90
AK		 2390static int kvmfs_get_sb(struct file_system_type *fs_type, int flags,
2391 const char *dev_name, void *data, struct vfsmount *mnt)
2392{
2393 return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_MAGIC, mnt);
2394}
2395
2396static struct file_system_type kvm_fs_type = {
2397 .name = "kvmfs",
2398 .get_sb = kvmfs_get_sb,
2399 .kill_sb = kill_anon_super,
2400};
2401
6aa8b732
AK		 2402int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
2403{
2404 int r;
2405
09db28b8
YI		 2406 if (kvm_arch_ops) {
2407 printk(KERN_ERR "kvm: already loaded the other module\n");
2408 return -EEXIST;
2409 }
2410
e097f35c 2411 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 2412 printk(KERN_ERR "kvm: no hardware support\n");
2413 return -EOPNOTSUPP;
2414 }
e097f35c 2415 if (ops->disabled_by_bios()) {
6aa8b732
AK		 2416 printk(KERN_ERR "kvm: disabled by bios\n");
2417 return -EOPNOTSUPP;
2418 }
2419
e097f35c
YI		 2420 kvm_arch_ops = ops;
2421
6aa8b732
AK		 2422 r = kvm_arch_ops->hardware_setup();
2423 if (r < 0)
2424 return r;
2425
8b6d44c7 2426 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
774c47f1
AK		 2427 r = register_cpu_notifier(&kvm_cpu_notifier);
2428 if (r)
2429 goto out_free_1;
6aa8b732
AK		 2430 register_reboot_notifier(&kvm_reboot_notifier);
2431
59ae6c6b
AK		 2432 r = sysdev_class_register(&kvm_sysdev_class);
2433 if (r)
2434 goto out_free_2;
2435
2436 r = sysdev_register(&kvm_sysdev);
2437 if (r)
2438 goto out_free_3;
2439
6aa8b732
AK		 2440 kvm_chardev_ops.owner = module;
2441
2442 r = misc_register(&kvm_dev);
2443 if (r) {
2444 printk (KERN_ERR "kvm: misc device register failed\n");
2445 goto out_free;
2446 }
2447
2448 return r;
2449
2450out_free:
59ae6c6b
AK		 2451 sysdev_unregister(&kvm_sysdev);
2452out_free_3:
2453 sysdev_class_unregister(&kvm_sysdev_class);
2454out_free_2:
6aa8b732 2455 unregister_reboot_notifier(&kvm_reboot_notifier);
774c47f1
AK		 2456 unregister_cpu_notifier(&kvm_cpu_notifier);
2457out_free_1:
8b6d44c7 2458 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2459 kvm_arch_ops->hardware_unsetup();
2460 return r;
2461}
2462
2463void kvm_exit_arch(void)
2464{
2465 misc_deregister(&kvm_dev);
59ae6c6b
AK		 2466 sysdev_unregister(&kvm_sysdev);
2467 sysdev_class_unregister(&kvm_sysdev_class);
6aa8b732 2468 unregister_reboot_notifier(&kvm_reboot_notifier);
59ae6c6b 2469 unregister_cpu_notifier(&kvm_cpu_notifier);
8b6d44c7 2470 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 2471 kvm_arch_ops->hardware_unsetup();
09db28b8 2472 kvm_arch_ops = NULL;
6aa8b732
AK		 2473}
2474
2475static __init int kvm_init(void)
2476{
2477 static struct page *bad_page;
37e29d90
AK		 2478 int r;
2479
2480 r = register_filesystem(&kvm_fs_type);
2481 if (r)
2482 goto out3;
6aa8b732 2483
37e29d90
AK		 2484 kvmfs_mnt = kern_mount(&kvm_fs_type);
2485 r = PTR_ERR(kvmfs_mnt);
2486 if (IS_ERR(kvmfs_mnt))
2487 goto out2;
6aa8b732
AK		 2488 kvm_init_debug();
2489
bf591b24
MR		 2490 kvm_init_msr_list();
2491
6aa8b732
AK		 2492 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2493 r = -ENOMEM;
2494 goto out;
2495 }
2496
2497 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2498 memset(__va(bad_page_address), 0, PAGE_SIZE);
2499
2500 return r;
2501
2502out:
2503 kvm_exit_debug();
37e29d90
AK		 2504 mntput(kvmfs_mnt);
2505out2:
2506 unregister_filesystem(&kvm_fs_type);
2507out3:
6aa8b732
AK		 2508 return r;
2509}
2510
2511static __exit void kvm_exit(void)
2512{
2513 kvm_exit_debug();
2514 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
37e29d90
AK		 2515 mntput(kvmfs_mnt);
2516 unregister_filesystem(&kvm_fs_type);
6aa8b732
AK		 2517}
2518
2519module_init(kvm_init)
2520module_exit(kvm_exit)
2521
2522EXPORT_SYMBOL_GPL(kvm_init_arch);
2523EXPORT_SYMBOL_GPL(kvm_exit_arch);
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