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KVM: MMU: Avoid heavy ASSERT at non debug mode.
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
e9cdb1e3 23#include <linux/magic.h>
6aa8b732
AK		 24#include <asm/processor.h>
25#include <linux/percpu.h>
26#include <linux/gfp.h>
27#include <asm/msr.h>
28#include <linux/mm.h>
29#include <linux/miscdevice.h>
30#include <linux/vmalloc.h>
31#include <asm/uaccess.h>
32#include <linux/reboot.h>
33#include <asm/io.h>
34#include <linux/debugfs.h>
35#include <linux/highmem.h>
36#include <linux/file.h>
37#include <asm/desc.h>
59ae6c6b 38#include <linux/sysdev.h>
774c47f1 39#include <linux/cpu.h>
f17abe9a 40#include <linux/file.h>
37e29d90
AK		 41#include <linux/fs.h>
42#include <linux/mount.h>
6aa8b732
AK		 43
44#include "x86_emulate.h"
45#include "segment_descriptor.h"
46
47MODULE_AUTHOR("Qumranet");
48MODULE_LICENSE("GPL");
49
133de902
AK		 50static DEFINE_SPINLOCK(kvm_lock);
51static LIST_HEAD(vm_list);
52
6aa8b732
AK		 53struct kvm_arch_ops *kvm_arch_ops;
54struct kvm_stat kvm_stat;
55EXPORT_SYMBOL_GPL(kvm_stat);
56
57static struct kvm_stats_debugfs_item {
58 const char *name;
59 u32 *data;
60 struct dentry *dentry;
61} debugfs_entries[] = {
62 { "pf_fixed", &kvm_stat.pf_fixed },
63 { "pf_guest", &kvm_stat.pf_guest },
64 { "tlb_flush", &kvm_stat.tlb_flush },
65 { "invlpg", &kvm_stat.invlpg },
66 { "exits", &kvm_stat.exits },
67 { "io_exits", &kvm_stat.io_exits },
68 { "mmio_exits", &kvm_stat.mmio_exits },
69 { "signal_exits", &kvm_stat.signal_exits },
c1150d8c
DL		 70 { "irq_window", &kvm_stat.irq_window_exits },
71 { "halt_exits", &kvm_stat.halt_exits },
72 { "request_irq", &kvm_stat.request_irq_exits },
6aa8b732 73 { "irq_exits", &kvm_stat.irq_exits },
8b6d44c7 74 { NULL, NULL }
6aa8b732
AK		 75};
76
77static struct dentry *debugfs_dir;
78
37e29d90
AK		 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
bccf2150
AK		 99static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
100 unsigned long arg);
101
f17abe9a
AK		 102static struct inode *kvmfs_inode(struct file_operations *fops)
103{
104 int error = -ENOMEM;
105 struct inode *inode = new_inode(kvmfs_mnt->mnt_sb);
106
107 if (!inode)
108 goto eexit_1;
109
110 inode->i_fop = fops;
111
112 /*
113 * Mark the inode dirty from the very beginning,
114 * that way it will never be moved to the dirty
115 * list because mark_inode_dirty() will think
116 * that it already _is_ on the dirty list.
117 */
118 inode->i_state = I_DIRTY;
119 inode->i_mode = S_IRUSR | S_IWUSR;
120 inode->i_uid = current->fsuid;
121 inode->i_gid = current->fsgid;
122 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
123 return inode;
124
125eexit_1:
126 return ERR_PTR(error);
127}
128
129static struct file *kvmfs_file(struct inode *inode, void *private_data)
130{
131 struct file *file = get_empty_filp();
132
133 if (!file)
134 return ERR_PTR(-ENFILE);
135
136 file->f_path.mnt = mntget(kvmfs_mnt);
137 file->f_path.dentry = d_alloc_anon(inode);
138 if (!file->f_path.dentry)
139 return ERR_PTR(-ENOMEM);
140 file->f_mapping = inode->i_mapping;
141
142 file->f_pos = 0;
143 file->f_flags = O_RDWR;
144 file->f_op = inode->i_fop;
145 file->f_mode = FMODE_READ | FMODE_WRITE;
146 file->f_version = 0;
147 file->private_data = private_data;
148 return file;
149}
150
6aa8b732
AK		 151unsigned long segment_base(u16 selector)
152{
153 struct descriptor_table gdt;
154 struct segment_descriptor *d;
155 unsigned long table_base;
156 typedef unsigned long ul;
157 unsigned long v;
158
159 if (selector == 0)
160 return 0;
161
162 asm ("sgdt %0" : "=m"(gdt));
163 table_base = gdt.base;
164
165 if (selector & 4) { /* from ldt */
166 u16 ldt_selector;
167
168 asm ("sldt %0" : "=g"(ldt_selector));
169 table_base = segment_base(ldt_selector);
170 }
171 d = (struct segment_descriptor *)(table_base + (selector & ~7));
172 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
05b3e0c2 173#ifdef CONFIG_X86_64
6aa8b732
AK		 174 if (d->system == 0
175 && (d->type == 2 || d->type == 9 || d->type == 11))
176 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
177#endif
178 return v;
179}
180EXPORT_SYMBOL_GPL(segment_base);
181
5aacf0ca
JM		 182static inline int valid_vcpu(int n)
183{
184 return likely(n >= 0 && n < KVM_MAX_VCPUS);
185}
186
d27d4aca
AK		 187int kvm_read_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
188 void *dest)
6aa8b732
AK		 189{
190 unsigned char *host_buf = dest;
191 unsigned long req_size = size;
192
193 while (size) {
194 hpa_t paddr;
195 unsigned now;
196 unsigned offset;
197 hva_t guest_buf;
198
199 paddr = gva_to_hpa(vcpu, addr);
200
201 if (is_error_hpa(paddr))
202 break;
203
204 guest_buf = (hva_t)kmap_atomic(
205 pfn_to_page(paddr >> PAGE_SHIFT),
206 KM_USER0);
207 offset = addr & ~PAGE_MASK;
208 guest_buf |= offset;
209 now = min(size, PAGE_SIZE - offset);
210 memcpy(host_buf, (void*)guest_buf, now);
211 host_buf += now;
212 addr += now;
213 size -= now;
214 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
215 }
216 return req_size - size;
217}
218EXPORT_SYMBOL_GPL(kvm_read_guest);
219
d27d4aca
AK		 220int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
221 void *data)
6aa8b732
AK		 222{
223 unsigned char *host_buf = data;
224 unsigned long req_size = size;
225
226 while (size) {
227 hpa_t paddr;
228 unsigned now;
229 unsigned offset;
230 hva_t guest_buf;
ab51a434 231 gfn_t gfn;
6aa8b732
AK		 232
233 paddr = gva_to_hpa(vcpu, addr);
234
235 if (is_error_hpa(paddr))
236 break;
237
ab51a434
UL		 238 gfn = vcpu->mmu.gva_to_gpa(vcpu, addr) >> PAGE_SHIFT;
239 mark_page_dirty(vcpu->kvm, gfn);
6aa8b732
AK		 240 guest_buf = (hva_t)kmap_atomic(
241 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
242 offset = addr & ~PAGE_MASK;
243 guest_buf |= offset;
244 now = min(size, PAGE_SIZE - offset);
245 memcpy((void*)guest_buf, host_buf, now);
246 host_buf += now;
247 addr += now;
248 size -= now;
249 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
250 }
251 return req_size - size;
252}
253EXPORT_SYMBOL_GPL(kvm_write_guest);
254
bccf2150
AK		 255/*
256 * Switches to specified vcpu, until a matching vcpu_put()
257 */
258static void vcpu_load(struct kvm_vcpu *vcpu)
6aa8b732 259{
bccf2150
AK		 260 mutex_lock(&vcpu->mutex);
261 kvm_arch_ops->vcpu_load(vcpu);
6aa8b732
AK		 262}
263
264/*
bccf2150
AK		 265 * Switches to specified vcpu, until a matching vcpu_put(). Will return NULL
266 * if the slot is not populated.
6aa8b732 267 */
bccf2150 268static struct kvm_vcpu *vcpu_load_slot(struct kvm *kvm, int slot)
6aa8b732 269{
bccf2150 270 struct kvm_vcpu *vcpu = &kvm->vcpus[slot];
6aa8b732
AK		 271
272 mutex_lock(&vcpu->mutex);
bccf2150 273 if (!vcpu->vmcs) {
6aa8b732 274 mutex_unlock(&vcpu->mutex);
8b6d44c7 275 return NULL;
6aa8b732 276 }
bccf2150
AK		 277 kvm_arch_ops->vcpu_load(vcpu);
278 return vcpu;
6aa8b732
AK		 279}
280
281static void vcpu_put(struct kvm_vcpu *vcpu)
282{
283 kvm_arch_ops->vcpu_put(vcpu);
6aa8b732
AK		 284 mutex_unlock(&vcpu->mutex);
285}
286
f17abe9a 287static struct kvm *kvm_create_vm(void)
6aa8b732
AK		 288{
289 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
290 int i;
291
292 if (!kvm)
f17abe9a 293 return ERR_PTR(-ENOMEM);
6aa8b732
AK		 294
295 spin_lock_init(&kvm->lock);
296 INIT_LIST_HEAD(&kvm->active_mmu_pages);
297 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
298 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
299
300 mutex_init(&vcpu->mutex);
133de902 301 vcpu->cpu = -1;
86a2b42e 302 vcpu->kvm = kvm;
6aa8b732
AK		 303 vcpu->mmu.root_hpa = INVALID_PAGE;
304 INIT_LIST_HEAD(&vcpu->free_pages);
133de902
AK		 305 spin_lock(&kvm_lock);
306 list_add(&kvm->vm_list, &vm_list);
307 spin_unlock(&kvm_lock);
6aa8b732 308 }
f17abe9a
AK		 309 return kvm;
310}
311
312static int kvm_dev_open(struct inode *inode, struct file *filp)
313{
6aa8b732
AK		 314 return 0;
315}
316
317/*
318 * Free any memory in @free but not in @dont.
319 */
320static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
321 struct kvm_memory_slot *dont)
322{
323 int i;
324
325 if (!dont || free->phys_mem != dont->phys_mem)
326 if (free->phys_mem) {
327 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 328 if (free->phys_mem[i])
329 __free_page(free->phys_mem[i]);
6aa8b732
AK		 330 vfree(free->phys_mem);
331 }
332
333 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
334 vfree(free->dirty_bitmap);
335
8b6d44c7 336 free->phys_mem = NULL;
6aa8b732 337 free->npages = 0;
8b6d44c7 338 free->dirty_bitmap = NULL;
6aa8b732
AK		 339}
340
341static void kvm_free_physmem(struct kvm *kvm)
342{
343 int i;
344
345 for (i = 0; i < kvm->nmemslots; ++i)
8b6d44c7 346 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
6aa8b732
AK		 347}
348
039576c0
AK		 349static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
350{
351 int i;
352
353 for (i = 0; i < 2; ++i)
354 if (vcpu->pio.guest_pages[i]) {
355 __free_page(vcpu->pio.guest_pages[i]);
356 vcpu->pio.guest_pages[i] = NULL;
357 }
358}
359
6aa8b732
AK		 360static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
361{
bccf2150 362 if (!vcpu->vmcs)
1e8ba6fb
IM		 363 return;
364
bccf2150 365 vcpu_load(vcpu);
6aa8b732 366 kvm_mmu_destroy(vcpu);
08438475 367 vcpu_put(vcpu);
9ede74e0 368 kvm_arch_ops->vcpu_free(vcpu);
9a2bb7f4
AK		 369 free_page((unsigned long)vcpu->run);
370 vcpu->run = NULL;
039576c0
AK		 371 free_page((unsigned long)vcpu->pio_data);
372 vcpu->pio_data = NULL;
373 free_pio_guest_pages(vcpu);
6aa8b732
AK		 374}
375
376static void kvm_free_vcpus(struct kvm *kvm)
377{
378 unsigned int i;
379
380 for (i = 0; i < KVM_MAX_VCPUS; ++i)
381 kvm_free_vcpu(&kvm->vcpus[i]);
382}
383
384static int kvm_dev_release(struct inode *inode, struct file *filp)
385{
f17abe9a
AK		 386 return 0;
387}
6aa8b732 388
f17abe9a
AK		 389static void kvm_destroy_vm(struct kvm *kvm)
390{
133de902
AK		 391 spin_lock(&kvm_lock);
392 list_del(&kvm->vm_list);
393 spin_unlock(&kvm_lock);
6aa8b732
AK		 394 kvm_free_vcpus(kvm);
395 kvm_free_physmem(kvm);
396 kfree(kvm);
f17abe9a
AK		 397}
398
399static int kvm_vm_release(struct inode *inode, struct file *filp)
400{
401 struct kvm *kvm = filp->private_data;
402
403 kvm_destroy_vm(kvm);
6aa8b732
AK		 404 return 0;
405}
406
407static void inject_gp(struct kvm_vcpu *vcpu)
408{
409 kvm_arch_ops->inject_gp(vcpu, 0);
410}
411
1342d353
AK		 412/*
413 * Load the pae pdptrs. Return true is they are all valid.
414 */
415static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
6aa8b732
AK		 416{
417 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
1342d353 418 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
6aa8b732
AK		 419 int i;
420 u64 pdpte;
421 u64 *pdpt;
1342d353 422 int ret;
954bbbc2 423 struct page *page;
6aa8b732
AK		 424
425 spin_lock(&vcpu->kvm->lock);
954bbbc2
AK		 426 page = gfn_to_page(vcpu->kvm, pdpt_gfn);
427 /* FIXME: !page - emulate? 0xff? */
428 pdpt = kmap_atomic(page, KM_USER0);
6aa8b732 429
1342d353 430 ret = 1;
6aa8b732
AK		 431 for (i = 0; i < 4; ++i) {
432 pdpte = pdpt[offset + i];
1342d353
AK		 433 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
434 ret = 0;
435 goto out;
436 }
6aa8b732
AK		 437 }
438
1342d353
AK		 439 for (i = 0; i < 4; ++i)
440 vcpu->pdptrs[i] = pdpt[offset + i];
441
442out:
6aa8b732
AK		 443 kunmap_atomic(pdpt, KM_USER0);
444 spin_unlock(&vcpu->kvm->lock);
445
1342d353 446 return ret;
6aa8b732
AK		 447}
448
449void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
450{
451 if (cr0 & CR0_RESEVED_BITS) {
452 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
453 cr0, vcpu->cr0);
454 inject_gp(vcpu);
455 return;
456 }
457
458 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
459 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
460 inject_gp(vcpu);
461 return;
462 }
463
464 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
465 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
466 "and a clear PE flag\n");
467 inject_gp(vcpu);
468 return;
469 }
470
471 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 472#ifdef CONFIG_X86_64
6aa8b732
AK		 473 if ((vcpu->shadow_efer & EFER_LME)) {
474 int cs_db, cs_l;
475
476 if (!is_pae(vcpu)) {
477 printk(KERN_DEBUG "set_cr0: #GP, start paging "
478 "in long mode while PAE is disabled\n");
479 inject_gp(vcpu);
480 return;
481 }
482 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
483 if (cs_l) {
484 printk(KERN_DEBUG "set_cr0: #GP, start paging "
485 "in long mode while CS.L == 1\n");
486 inject_gp(vcpu);
487 return;
488
489 }
490 } else
491#endif
1342d353 492 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 493 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
494 "reserved bits\n");
495 inject_gp(vcpu);
496 return;
497 }
498
499 }
500
501 kvm_arch_ops->set_cr0(vcpu, cr0);
502 vcpu->cr0 = cr0;
503
504 spin_lock(&vcpu->kvm->lock);
505 kvm_mmu_reset_context(vcpu);
506 spin_unlock(&vcpu->kvm->lock);
507 return;
508}
509EXPORT_SYMBOL_GPL(set_cr0);
510
511void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
512{
399badf3 513 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 514 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
515}
516EXPORT_SYMBOL_GPL(lmsw);
517
518void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
519{
520 if (cr4 & CR4_RESEVED_BITS) {
521 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
522 inject_gp(vcpu);
523 return;
524 }
525
a9058ecd 526 if (is_long_mode(vcpu)) {
6aa8b732
AK		 527 if (!(cr4 & CR4_PAE_MASK)) {
528 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
529 "in long mode\n");
530 inject_gp(vcpu);
531 return;
532 }
533 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
1342d353 534 && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 535 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
536 inject_gp(vcpu);
537 }
538
539 if (cr4 & CR4_VMXE_MASK) {
540 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
541 inject_gp(vcpu);
542 return;
543 }
544 kvm_arch_ops->set_cr4(vcpu, cr4);
545 spin_lock(&vcpu->kvm->lock);
546 kvm_mmu_reset_context(vcpu);
547 spin_unlock(&vcpu->kvm->lock);
548}
549EXPORT_SYMBOL_GPL(set_cr4);
550
551void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
552{
a9058ecd 553 if (is_long_mode(vcpu)) {
d27d4aca 554 if (cr3 & CR3_L_MODE_RESEVED_BITS) {
6aa8b732
AK		 555 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
556 inject_gp(vcpu);
557 return;
558 }
559 } else {
560 if (cr3 & CR3_RESEVED_BITS) {
561 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
562 inject_gp(vcpu);
563 return;
564 }
565 if (is_paging(vcpu) && is_pae(vcpu) &&
1342d353 566 !load_pdptrs(vcpu, cr3)) {
6aa8b732
AK		 567 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
568 "reserved bits\n");
569 inject_gp(vcpu);
570 return;
571 }
572 }
573
574 vcpu->cr3 = cr3;
575 spin_lock(&vcpu->kvm->lock);
d21225ee
IM		 576 /*
577 * Does the new cr3 value map to physical memory? (Note, we
578 * catch an invalid cr3 even in real-mode, because it would
579 * cause trouble later on when we turn on paging anyway.)
580 *
581 * A real CPU would silently accept an invalid cr3 and would
582 * attempt to use it - with largely undefined (and often hard
583 * to debug) behavior on the guest side.
584 */
585 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
586 inject_gp(vcpu);
587 else
588 vcpu->mmu.new_cr3(vcpu);
6aa8b732
AK		 589 spin_unlock(&vcpu->kvm->lock);
590}
591EXPORT_SYMBOL_GPL(set_cr3);
592
593void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
594{
595 if ( cr8 & CR8_RESEVED_BITS) {
596 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
597 inject_gp(vcpu);
598 return;
599 }
600 vcpu->cr8 = cr8;
601}
602EXPORT_SYMBOL_GPL(set_cr8);
603
604void fx_init(struct kvm_vcpu *vcpu)
605{
606 struct __attribute__ ((__packed__)) fx_image_s {
607 u16 control; //fcw
608 u16 status; //fsw
609 u16 tag; // ftw
610 u16 opcode; //fop
611 u64 ip; // fpu ip
612 u64 operand;// fpu dp
613 u32 mxcsr;
614 u32 mxcsr_mask;
615
616 } *fx_image;
617
618 fx_save(vcpu->host_fx_image);
619 fpu_init();
620 fx_save(vcpu->guest_fx_image);
621 fx_restore(vcpu->host_fx_image);
622
623 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
624 fx_image->mxcsr = 0x1f80;
625 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
626 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
627}
628EXPORT_SYMBOL_GPL(fx_init);
629
02b27c1f
UL		 630static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
631{
632 spin_lock(&vcpu->kvm->lock);
633 kvm_mmu_slot_remove_write_access(vcpu, slot);
634 spin_unlock(&vcpu->kvm->lock);
635}
636
6aa8b732
AK		 637/*
638 * Allocate some memory and give it an address in the guest physical address
639 * space.
640 *
641 * Discontiguous memory is allowed, mostly for framebuffers.
642 */
2c6f5df9
AK		 643static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
644 struct kvm_memory_region *mem)
6aa8b732
AK		 645{
646 int r;
647 gfn_t base_gfn;
648 unsigned long npages;
649 unsigned long i;
650 struct kvm_memory_slot *memslot;
651 struct kvm_memory_slot old, new;
652 int memory_config_version;
653
654 r = -EINVAL;
655 /* General sanity checks */
656 if (mem->memory_size & (PAGE_SIZE - 1))
657 goto out;
658 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
659 goto out;
660 if (mem->slot >= KVM_MEMORY_SLOTS)
661 goto out;
662 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
663 goto out;
664
665 memslot = &kvm->memslots[mem->slot];
666 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
667 npages = mem->memory_size >> PAGE_SHIFT;
668
669 if (!npages)
670 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
671
672raced:
673 spin_lock(&kvm->lock);
674
675 memory_config_version = kvm->memory_config_version;
676 new = old = *memslot;
677
678 new.base_gfn = base_gfn;
679 new.npages = npages;
680 new.flags = mem->flags;
681
682 /* Disallow changing a memory slot's size. */
683 r = -EINVAL;
684 if (npages && old.npages && npages != old.npages)
685 goto out_unlock;
686
687 /* Check for overlaps */
688 r = -EEXIST;
689 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
690 struct kvm_memory_slot *s = &kvm->memslots[i];
691
692 if (s == memslot)
693 continue;
694 if (!((base_gfn + npages <= s->base_gfn) ||
695 (base_gfn >= s->base_gfn + s->npages)))
696 goto out_unlock;
697 }
698 /*
699 * Do memory allocations outside lock. memory_config_version will
700 * detect any races.
701 */
702 spin_unlock(&kvm->lock);
703
704 /* Deallocate if slot is being removed */
705 if (!npages)
8b6d44c7 706 new.phys_mem = NULL;
6aa8b732
AK		 707
708 /* Free page dirty bitmap if unneeded */
709 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
8b6d44c7 710 new.dirty_bitmap = NULL;
6aa8b732
AK		 711
712 r = -ENOMEM;
713
714 /* Allocate if a slot is being created */
715 if (npages && !new.phys_mem) {
716 new.phys_mem = vmalloc(npages * sizeof(struct page *));
717
718 if (!new.phys_mem)
719 goto out_free;
720
721 memset(new.phys_mem, 0, npages * sizeof(struct page *));
722 for (i = 0; i < npages; ++i) {
723 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
724 | __GFP_ZERO);
725 if (!new.phys_mem[i])
726 goto out_free;
5972e953 727 set_page_private(new.phys_mem[i],0);
6aa8b732
AK		 728 }
729 }
730
731 /* Allocate page dirty bitmap if needed */
732 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
733 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
734
735 new.dirty_bitmap = vmalloc(dirty_bytes);
736 if (!new.dirty_bitmap)
737 goto out_free;
738 memset(new.dirty_bitmap, 0, dirty_bytes);
739 }
740
741 spin_lock(&kvm->lock);
742
743 if (memory_config_version != kvm->memory_config_version) {
744 spin_unlock(&kvm->lock);
745 kvm_free_physmem_slot(&new, &old);
746 goto raced;
747 }
748
749 r = -EAGAIN;
750 if (kvm->busy)
751 goto out_unlock;
752
753 if (mem->slot >= kvm->nmemslots)
754 kvm->nmemslots = mem->slot + 1;
755
756 *memslot = new;
757 ++kvm->memory_config_version;
758
759 spin_unlock(&kvm->lock);
760
761 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
762 struct kvm_vcpu *vcpu;
763
bccf2150 764 vcpu = vcpu_load_slot(kvm, i);
6aa8b732
AK		 765 if (!vcpu)
766 continue;
ff990d59
UL		 767 if (new.flags & KVM_MEM_LOG_DIRTY_PAGES)
768 do_remove_write_access(vcpu, mem->slot);
6aa8b732
AK		 769 kvm_mmu_reset_context(vcpu);
770 vcpu_put(vcpu);
771 }
772
773 kvm_free_physmem_slot(&old, &new);
774 return 0;
775
776out_unlock:
777 spin_unlock(&kvm->lock);
778out_free:
779 kvm_free_physmem_slot(&new, &old);
780out:
781 return r;
782}
783
784/*
785 * Get (and clear) the dirty memory log for a memory slot.
786 */
2c6f5df9
AK		 787static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
788 struct kvm_dirty_log *log)
6aa8b732
AK		 789{
790 struct kvm_memory_slot *memslot;
791 int r, i;
792 int n;
714b93da 793 int cleared;
6aa8b732
AK		 794 unsigned long any = 0;
795
796 spin_lock(&kvm->lock);
797
798 /*
799 * Prevent changes to guest memory configuration even while the lock
800 * is not taken.
801 */
802 ++kvm->busy;
803 spin_unlock(&kvm->lock);
804 r = -EINVAL;
805 if (log->slot >= KVM_MEMORY_SLOTS)
806 goto out;
807
808 memslot = &kvm->memslots[log->slot];
809 r = -ENOENT;
810 if (!memslot->dirty_bitmap)
811 goto out;
812
cd1a4a98 813 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
6aa8b732 814
cd1a4a98 815 for (i = 0; !any && i < n/sizeof(long); ++i)
6aa8b732
AK		 816 any = memslot->dirty_bitmap[i];
817
818 r = -EFAULT;
819 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
820 goto out;
821
6aa8b732 822 if (any) {
714b93da 823 cleared = 0;
6aa8b732 824 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
bccf2150 825 struct kvm_vcpu *vcpu;
6aa8b732 826
bccf2150 827 vcpu = vcpu_load_slot(kvm, i);
6aa8b732
AK		 828 if (!vcpu)
829 continue;
714b93da
AK		 830 if (!cleared) {
831 do_remove_write_access(vcpu, log->slot);
832 memset(memslot->dirty_bitmap, 0, n);
833 cleared = 1;
834 }
6aa8b732
AK		 835 kvm_arch_ops->tlb_flush(vcpu);
836 vcpu_put(vcpu);
837 }
838 }
839
840 r = 0;
841
842out:
843 spin_lock(&kvm->lock);
844 --kvm->busy;
845 spin_unlock(&kvm->lock);
846 return r;
847}
848
e8207547
AK		 849/*
850 * Set a new alias region. Aliases map a portion of physical memory into
851 * another portion. This is useful for memory windows, for example the PC
852 * VGA region.
853 */
854static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
855 struct kvm_memory_alias *alias)
856{
857 int r, n;
858 struct kvm_mem_alias *p;
859
860 r = -EINVAL;
861 /* General sanity checks */
862 if (alias->memory_size & (PAGE_SIZE - 1))
863 goto out;
864 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
865 goto out;
866 if (alias->slot >= KVM_ALIAS_SLOTS)
867 goto out;
868 if (alias->guest_phys_addr + alias->memory_size
869 < alias->guest_phys_addr)
870 goto out;
871 if (alias->target_phys_addr + alias->memory_size
872 < alias->target_phys_addr)
873 goto out;
874
875 spin_lock(&kvm->lock);
876
877 p = &kvm->aliases[alias->slot];
878 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
879 p->npages = alias->memory_size >> PAGE_SHIFT;
880 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
881
882 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
883 if (kvm->aliases[n - 1].npages)
884 break;
885 kvm->naliases = n;
886
887 spin_unlock(&kvm->lock);
888
889 vcpu_load(&kvm->vcpus[0]);
890 spin_lock(&kvm->lock);
891 kvm_mmu_zap_all(&kvm->vcpus[0]);
892 spin_unlock(&kvm->lock);
893 vcpu_put(&kvm->vcpus[0]);
894
895 return 0;
896
897out:
898 return r;
899}
900
901static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
902{
903 int i;
904 struct kvm_mem_alias *alias;
905
906 for (i = 0; i < kvm->naliases; ++i) {
907 alias = &kvm->aliases[i];
908 if (gfn >= alias->base_gfn
909 && gfn < alias->base_gfn + alias->npages)
910 return alias->target_gfn + gfn - alias->base_gfn;
911 }
912 return gfn;
913}
914
915static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
6aa8b732
AK		 916{
917 int i;
918
919 for (i = 0; i < kvm->nmemslots; ++i) {
920 struct kvm_memory_slot *memslot = &kvm->memslots[i];
921
922 if (gfn >= memslot->base_gfn
923 && gfn < memslot->base_gfn + memslot->npages)
924 return memslot;
925 }
8b6d44c7 926 return NULL;
6aa8b732 927}
e8207547
AK		 928
929struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
930{
931 gfn = unalias_gfn(kvm, gfn);
932 return __gfn_to_memslot(kvm, gfn);
933}
6aa8b732 934
954bbbc2
AK		 935struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
936{
937 struct kvm_memory_slot *slot;
938
e8207547
AK		 939 gfn = unalias_gfn(kvm, gfn);
940 slot = __gfn_to_memslot(kvm, gfn);
954bbbc2
AK		 941 if (!slot)
942 return NULL;
943 return slot->phys_mem[gfn - slot->base_gfn];
944}
945EXPORT_SYMBOL_GPL(gfn_to_page);
946
6aa8b732
AK		 947void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
948{
949 int i;
8b6d44c7 950 struct kvm_memory_slot *memslot = NULL;
6aa8b732
AK		 951 unsigned long rel_gfn;
952
953 for (i = 0; i < kvm->nmemslots; ++i) {
954 memslot = &kvm->memslots[i];
955
956 if (gfn >= memslot->base_gfn
957 && gfn < memslot->base_gfn + memslot->npages) {
958
959 if (!memslot || !memslot->dirty_bitmap)
960 return;
961
962 rel_gfn = gfn - memslot->base_gfn;
963
964 /* avoid RMW */
965 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
966 set_bit(rel_gfn, memslot->dirty_bitmap);
967 return;
968 }
969 }
970}
971
972static int emulator_read_std(unsigned long addr,
973 unsigned long *val,
974 unsigned int bytes,
975 struct x86_emulate_ctxt *ctxt)
976{
977 struct kvm_vcpu *vcpu = ctxt->vcpu;
978 void *data = val;
979
980 while (bytes) {
981 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
982 unsigned offset = addr & (PAGE_SIZE-1);
983 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
984 unsigned long pfn;
954bbbc2
AK		 985 struct page *page;
986 void *page_virt;
6aa8b732
AK		 987
988 if (gpa == UNMAPPED_GVA)
989 return X86EMUL_PROPAGATE_FAULT;
990 pfn = gpa >> PAGE_SHIFT;
954bbbc2
AK		 991 page = gfn_to_page(vcpu->kvm, pfn);
992 if (!page)
6aa8b732 993 return X86EMUL_UNHANDLEABLE;
954bbbc2 994 page_virt = kmap_atomic(page, KM_USER0);
6aa8b732 995
954bbbc2 996 memcpy(data, page_virt + offset, tocopy);
6aa8b732 997
954bbbc2 998 kunmap_atomic(page_virt, KM_USER0);
6aa8b732
AK		 999
1000 bytes -= tocopy;
1001 data += tocopy;
1002 addr += tocopy;
1003 }
1004
1005 return X86EMUL_CONTINUE;
1006}
1007
1008static int emulator_write_std(unsigned long addr,
1009 unsigned long val,
1010 unsigned int bytes,
1011 struct x86_emulate_ctxt *ctxt)
1012{
1013 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
1014 addr, bytes);
1015 return X86EMUL_UNHANDLEABLE;
1016}
1017
1018static int emulator_read_emulated(unsigned long addr,
1019 unsigned long *val,
1020 unsigned int bytes,
1021 struct x86_emulate_ctxt *ctxt)
1022{
1023 struct kvm_vcpu *vcpu = ctxt->vcpu;
1024
1025 if (vcpu->mmio_read_completed) {
1026 memcpy(val, vcpu->mmio_data, bytes);
1027 vcpu->mmio_read_completed = 0;
1028 return X86EMUL_CONTINUE;
1029 } else if (emulator_read_std(addr, val, bytes, ctxt)
1030 == X86EMUL_CONTINUE)
1031 return X86EMUL_CONTINUE;
1032 else {
1033 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
d27d4aca 1034
6aa8b732 1035 if (gpa == UNMAPPED_GVA)
d27d4aca 1036 return X86EMUL_PROPAGATE_FAULT;
6aa8b732
AK		 1037 vcpu->mmio_needed = 1;
1038 vcpu->mmio_phys_addr = gpa;
1039 vcpu->mmio_size = bytes;
1040 vcpu->mmio_is_write = 0;
1041
1042 return X86EMUL_UNHANDLEABLE;
1043 }
1044}
1045
da4a00f0
AK		 1046static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1047 unsigned long val, int bytes)
1048{
da4a00f0
AK		 1049 struct page *page;
1050 void *virt;
1051
1052 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
1053 return 0;
954bbbc2
AK		 1054 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1055 if (!page)
da4a00f0 1056 return 0;
da4a00f0 1057 kvm_mmu_pre_write(vcpu, gpa, bytes);
ab51a434 1058 mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
da4a00f0
AK		 1059 virt = kmap_atomic(page, KM_USER0);
1060 memcpy(virt + offset_in_page(gpa), &val, bytes);
1061 kunmap_atomic(virt, KM_USER0);
1062 kvm_mmu_post_write(vcpu, gpa, bytes);
1063 return 1;
1064}
1065
6aa8b732
AK		 1066static int emulator_write_emulated(unsigned long addr,
1067 unsigned long val,
1068 unsigned int bytes,
1069 struct x86_emulate_ctxt *ctxt)
1070{
1071 struct kvm_vcpu *vcpu = ctxt->vcpu;
1072 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1073
c9047f53
AK		 1074 if (gpa == UNMAPPED_GVA) {
1075 kvm_arch_ops->inject_page_fault(vcpu, addr, 2);
6aa8b732 1076 return X86EMUL_PROPAGATE_FAULT;
c9047f53 1077 }
6aa8b732 1078
da4a00f0
AK		 1079 if (emulator_write_phys(vcpu, gpa, val, bytes))
1080 return X86EMUL_CONTINUE;
1081
6aa8b732
AK		 1082 vcpu->mmio_needed = 1;
1083 vcpu->mmio_phys_addr = gpa;
1084 vcpu->mmio_size = bytes;
1085 vcpu->mmio_is_write = 1;
1086 memcpy(vcpu->mmio_data, &val, bytes);
1087
1088 return X86EMUL_CONTINUE;
1089}
1090
1091static int emulator_cmpxchg_emulated(unsigned long addr,
1092 unsigned long old,
1093 unsigned long new,
1094 unsigned int bytes,
1095 struct x86_emulate_ctxt *ctxt)
1096{
1097 static int reported;
1098
1099 if (!reported) {
1100 reported = 1;
1101 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1102 }
1103 return emulator_write_emulated(addr, new, bytes, ctxt);
1104}
1105
32b35627
AK		 1106#ifdef CONFIG_X86_32
1107
1108static int emulator_cmpxchg8b_emulated(unsigned long addr,
1109 unsigned long old_lo,
1110 unsigned long old_hi,
1111 unsigned long new_lo,
1112 unsigned long new_hi,
1113 struct x86_emulate_ctxt *ctxt)
1114{
1115 static int reported;
1116 int r;
1117
1118 if (!reported) {
1119 reported = 1;
1120 printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
1121 }
1122 r = emulator_write_emulated(addr, new_lo, 4, ctxt);
1123 if (r != X86EMUL_CONTINUE)
1124 return r;
1125 return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
1126}
1127
1128#endif
1129
6aa8b732
AK		 1130static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1131{
1132 return kvm_arch_ops->get_segment_base(vcpu, seg);
1133}
1134
1135int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1136{
6aa8b732
AK		 1137 return X86EMUL_CONTINUE;
1138}
1139
1140int emulate_clts(struct kvm_vcpu *vcpu)
1141{
399badf3 1142 unsigned long cr0;
6aa8b732 1143
399badf3
AK		 1144 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1145 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
6aa8b732
AK		 1146 kvm_arch_ops->set_cr0(vcpu, cr0);
1147 return X86EMUL_CONTINUE;
1148}
1149
1150int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1151{
1152 struct kvm_vcpu *vcpu = ctxt->vcpu;
1153
1154 switch (dr) {
1155 case 0 ... 3:
1156 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1157 return X86EMUL_CONTINUE;
1158 default:
1159 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1160 __FUNCTION__, dr);
1161 return X86EMUL_UNHANDLEABLE;
1162 }
1163}
1164
1165int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1166{
1167 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1168 int exception;
1169
1170 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1171 if (exception) {
1172 /* FIXME: better handling */
1173 return X86EMUL_UNHANDLEABLE;
1174 }
1175 return X86EMUL_CONTINUE;
1176}
1177
1178static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1179{
1180 static int reported;
1181 u8 opcodes[4];
1182 unsigned long rip = ctxt->vcpu->rip;
1183 unsigned long rip_linear;
1184
1185 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1186
1187 if (reported)
1188 return;
1189
1190 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1191
1192 printk(KERN_ERR "emulation failed but !mmio_needed?"
1193 " rip %lx %02x %02x %02x %02x\n",
1194 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1195 reported = 1;
1196}
1197
1198struct x86_emulate_ops emulate_ops = {
1199 .read_std = emulator_read_std,
1200 .write_std = emulator_write_std,
1201 .read_emulated = emulator_read_emulated,
1202 .write_emulated = emulator_write_emulated,
1203 .cmpxchg_emulated = emulator_cmpxchg_emulated,
32b35627
AK		 1204#ifdef CONFIG_X86_32
1205 .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated,
1206#endif
6aa8b732
AK		 1207};
1208
1209int emulate_instruction(struct kvm_vcpu *vcpu,
1210 struct kvm_run *run,
1211 unsigned long cr2,
1212 u16 error_code)
1213{
1214 struct x86_emulate_ctxt emulate_ctxt;
1215 int r;
1216 int cs_db, cs_l;
1217
1218 kvm_arch_ops->cache_regs(vcpu);
1219
1220 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1221
1222 emulate_ctxt.vcpu = vcpu;
1223 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1224 emulate_ctxt.cr2 = cr2;
1225 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1226 ? X86EMUL_MODE_REAL : cs_l
1227 ? X86EMUL_MODE_PROT64 : cs_db
1228 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1229
1230 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1231 emulate_ctxt.cs_base = 0;
1232 emulate_ctxt.ds_base = 0;
1233 emulate_ctxt.es_base = 0;
1234 emulate_ctxt.ss_base = 0;
1235 } else {
1236 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1237 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1238 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1239 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1240 }
1241
1242 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1243 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1244
1245 vcpu->mmio_is_write = 0;
1246 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1247
1248 if ((r || vcpu->mmio_is_write) && run) {
1249 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1250 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1251 run->mmio.len = vcpu->mmio_size;
1252 run->mmio.is_write = vcpu->mmio_is_write;
1253 }
1254
1255 if (r) {
a436036b
AK		 1256 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1257 return EMULATE_DONE;
6aa8b732
AK		 1258 if (!vcpu->mmio_needed) {
1259 report_emulation_failure(&emulate_ctxt);
1260 return EMULATE_FAIL;
1261 }
1262 return EMULATE_DO_MMIO;
1263 }
1264
1265 kvm_arch_ops->decache_regs(vcpu);
1266 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1267
1268 if (vcpu->mmio_is_write)
1269 return EMULATE_DO_MMIO;
1270
1271 return EMULATE_DONE;
1272}
1273EXPORT_SYMBOL_GPL(emulate_instruction);
1274
270fd9b9
AK		 1275int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1276{
1277 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1278
9b22bf57 1279 kvm_arch_ops->cache_regs(vcpu);
270fd9b9
AK		 1280 ret = -KVM_EINVAL;
1281#ifdef CONFIG_X86_64
1282 if (is_long_mode(vcpu)) {
1283 nr = vcpu->regs[VCPU_REGS_RAX];
1284 a0 = vcpu->regs[VCPU_REGS_RDI];
1285 a1 = vcpu->regs[VCPU_REGS_RSI];
1286 a2 = vcpu->regs[VCPU_REGS_RDX];
1287 a3 = vcpu->regs[VCPU_REGS_RCX];
1288 a4 = vcpu->regs[VCPU_REGS_R8];
1289 a5 = vcpu->regs[VCPU_REGS_R9];
1290 } else
1291#endif
1292 {
1293 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1294 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1295 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1296 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1297 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1298 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1299 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1300 }
1301 switch (nr) {
1302 default:
b4e63f56
AK		 1303 run->hypercall.args[0] = a0;
1304 run->hypercall.args[1] = a1;
1305 run->hypercall.args[2] = a2;
1306 run->hypercall.args[3] = a3;
1307 run->hypercall.args[4] = a4;
1308 run->hypercall.args[5] = a5;
1309 run->hypercall.ret = ret;
1310 run->hypercall.longmode = is_long_mode(vcpu);
1311 kvm_arch_ops->decache_regs(vcpu);
1312 return 0;
270fd9b9
AK		 1313 }
1314 vcpu->regs[VCPU_REGS_RAX] = ret;
9b22bf57 1315 kvm_arch_ops->decache_regs(vcpu);
270fd9b9
AK		 1316 return 1;
1317}
1318EXPORT_SYMBOL_GPL(kvm_hypercall);
1319
6aa8b732
AK		 1320static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1321{
1322 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1323}
1324
1325void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1326{
1327 struct descriptor_table dt = { limit, base };
1328
1329 kvm_arch_ops->set_gdt(vcpu, &dt);
1330}
1331
1332void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1333{
1334 struct descriptor_table dt = { limit, base };
1335
1336 kvm_arch_ops->set_idt(vcpu, &dt);
1337}
1338
1339void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1340 unsigned long *rflags)
1341{
1342 lmsw(vcpu, msw);
1343 *rflags = kvm_arch_ops->get_rflags(vcpu);
1344}
1345
1346unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1347{
399badf3 1348 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1349 switch (cr) {
1350 case 0:
1351 return vcpu->cr0;
1352 case 2:
1353 return vcpu->cr2;
1354 case 3:
1355 return vcpu->cr3;
1356 case 4:
1357 return vcpu->cr4;
1358 default:
1359 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1360 return 0;
1361 }
1362}
1363
1364void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1365 unsigned long *rflags)
1366{
1367 switch (cr) {
1368 case 0:
1369 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1370 *rflags = kvm_arch_ops->get_rflags(vcpu);
1371 break;
1372 case 2:
1373 vcpu->cr2 = val;
1374 break;
1375 case 3:
1376 set_cr3(vcpu, val);
1377 break;
1378 case 4:
1379 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1380 break;
1381 default:
1382 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1383 }
1384}
1385
102d8325
IM		 1386/*
1387 * Register the para guest with the host:
1388 */
1389static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1390{
1391 struct kvm_vcpu_para_state *para_state;
1392 hpa_t para_state_hpa, hypercall_hpa;
1393 struct page *para_state_page;
1394 unsigned char *hypercall;
1395 gpa_t hypercall_gpa;
1396
1397 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1398 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1399
1400 /*
1401 * Needs to be page aligned:
1402 */
1403 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1404 goto err_gp;
1405
1406 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1407 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1408 if (is_error_hpa(para_state_hpa))
1409 goto err_gp;
1410
ab51a434 1411 mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
102d8325
IM		 1412 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1413 para_state = kmap_atomic(para_state_page, KM_USER0);
1414
1415 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1416 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1417
1418 para_state->host_version = KVM_PARA_API_VERSION;
1419 /*
1420 * We cannot support guests that try to register themselves
1421 * with a newer API version than the host supports:
1422 */
1423 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1424 para_state->ret = -KVM_EINVAL;
1425 goto err_kunmap_skip;
1426 }
1427
1428 hypercall_gpa = para_state->hypercall_gpa;
1429 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1430 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1431 if (is_error_hpa(hypercall_hpa)) {
1432 para_state->ret = -KVM_EINVAL;
1433 goto err_kunmap_skip;
1434 }
1435
1436 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1437 vcpu->para_state_page = para_state_page;
1438 vcpu->para_state_gpa = para_state_gpa;
1439 vcpu->hypercall_gpa = hypercall_gpa;
1440
ab51a434 1441 mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
102d8325
IM		 1442 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1443 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1444 kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1445 kunmap_atomic(hypercall, KM_USER1);
1446
1447 para_state->ret = 0;
1448err_kunmap_skip:
1449 kunmap_atomic(para_state, KM_USER0);
1450 return 0;
1451err_gp:
1452 return 1;
1453}
1454
3bab1f5d
AK		 1455int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1456{
1457 u64 data;
1458
1459 switch (msr) {
1460 case 0xc0010010: /* SYSCFG */
1461 case 0xc0010015: /* HWCR */
1462 case MSR_IA32_PLATFORM_ID:
1463 case MSR_IA32_P5_MC_ADDR:
1464 case MSR_IA32_P5_MC_TYPE:
1465 case MSR_IA32_MC0_CTL:
1466 case MSR_IA32_MCG_STATUS:
1467 case MSR_IA32_MCG_CAP:
1468 case MSR_IA32_MC0_MISC:
1469 case MSR_IA32_MC0_MISC+4:
1470 case MSR_IA32_MC0_MISC+8:
1471 case MSR_IA32_MC0_MISC+12:
1472 case MSR_IA32_MC0_MISC+16:
1473 case MSR_IA32_UCODE_REV:
a8d13ea2 1474 case MSR_IA32_PERF_STATUS:
3bab1f5d
AK		 1475 /* MTRR registers */
1476 case 0xfe:
1477 case 0x200 ... 0x2ff:
1478 data = 0;
1479 break;
a8d13ea2
AK		 1480 case 0xcd: /* fsb frequency */
1481 data = 3;
1482 break;
3bab1f5d
AK		 1483 case MSR_IA32_APICBASE:
1484 data = vcpu->apic_base;
1485 break;
6f00e68f
AK		 1486 case MSR_IA32_MISC_ENABLE:
1487 data = vcpu->ia32_misc_enable_msr;
1488 break;
3bab1f5d
AK		 1489#ifdef CONFIG_X86_64
1490 case MSR_EFER:
1491 data = vcpu->shadow_efer;
1492 break;
1493#endif
1494 default:
1495 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1496 return 1;
1497 }
1498 *pdata = data;
1499 return 0;
1500}
1501EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1502
6aa8b732
AK		 1503/*
1504 * Reads an msr value (of 'msr_index') into 'pdata'.
1505 * Returns 0 on success, non-0 otherwise.
1506 * Assumes vcpu_load() was already called.
1507 */
1508static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1509{
1510 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1511}
1512
05b3e0c2 1513#ifdef CONFIG_X86_64
6aa8b732 1514
3bab1f5d 1515static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1516{
6aa8b732
AK		 1517 if (efer & EFER_RESERVED_BITS) {
1518 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1519 efer);
1520 inject_gp(vcpu);
1521 return;
1522 }
1523
1524 if (is_paging(vcpu)
1525 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1526 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1527 inject_gp(vcpu);
1528 return;
1529 }
1530
7725f0ba
AK		 1531 kvm_arch_ops->set_efer(vcpu, efer);
1532
6aa8b732
AK		 1533 efer &= ~EFER_LMA;
1534 efer |= vcpu->shadow_efer & EFER_LMA;
1535
1536 vcpu->shadow_efer = efer;
6aa8b732 1537}
6aa8b732
AK		 1538
1539#endif
1540
3bab1f5d
AK		 1541int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1542{
1543 switch (msr) {
1544#ifdef CONFIG_X86_64
1545 case MSR_EFER:
1546 set_efer(vcpu, data);
1547 break;
1548#endif
1549 case MSR_IA32_MC0_STATUS:
1550 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1551 __FUNCTION__, data);
1552 break;
0e5bf0d0
SK		 1553 case MSR_IA32_MCG_STATUS:
1554 printk(KERN_WARNING "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
1555 __FUNCTION__, data);
1556 break;
3bab1f5d
AK		 1557 case MSR_IA32_UCODE_REV:
1558 case MSR_IA32_UCODE_WRITE:
1559 case 0x200 ... 0x2ff: /* MTRRs */
1560 break;
1561 case MSR_IA32_APICBASE:
1562 vcpu->apic_base = data;
1563 break;
6f00e68f
AK		 1564 case MSR_IA32_MISC_ENABLE:
1565 vcpu->ia32_misc_enable_msr = data;
1566 break;
102d8325
IM		 1567 /*
1568 * This is the 'probe whether the host is KVM' logic:
1569 */
1570 case MSR_KVM_API_MAGIC:
1571 return vcpu_register_para(vcpu, data);
1572
3bab1f5d
AK		 1573 default:
1574 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1575 return 1;
1576 }
1577 return 0;
1578}
1579EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1580
6aa8b732
AK		 1581/*
1582 * Writes msr value into into the appropriate "register".
1583 * Returns 0 on success, non-0 otherwise.
1584 * Assumes vcpu_load() was already called.
1585 */
1586static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1587{
1588 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1589}
1590
1591void kvm_resched(struct kvm_vcpu *vcpu)
1592{
1593 vcpu_put(vcpu);
1594 cond_resched();
bccf2150 1595 vcpu_load(vcpu);
6aa8b732
AK		 1596}
1597EXPORT_SYMBOL_GPL(kvm_resched);
1598
1599void load_msrs(struct vmx_msr_entry *e, int n)
1600{
1601 int i;
1602
1603 for (i = 0; i < n; ++i)
1604 wrmsrl(e[i].index, e[i].data);
1605}
1606EXPORT_SYMBOL_GPL(load_msrs);
1607
1608void save_msrs(struct vmx_msr_entry *e, int n)
1609{
1610 int i;
1611
1612 for (i = 0; i < n; ++i)
1613 rdmsrl(e[i].index, e[i].data);
1614}
1615EXPORT_SYMBOL_GPL(save_msrs);
1616
06465c5a
AK		 1617void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1618{
1619 int i;
1620 u32 function;
1621 struct kvm_cpuid_entry *e, *best;
1622
1623 kvm_arch_ops->cache_regs(vcpu);
1624 function = vcpu->regs[VCPU_REGS_RAX];
1625 vcpu->regs[VCPU_REGS_RAX] = 0;
1626 vcpu->regs[VCPU_REGS_RBX] = 0;
1627 vcpu->regs[VCPU_REGS_RCX] = 0;
1628 vcpu->regs[VCPU_REGS_RDX] = 0;
1629 best = NULL;
1630 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1631 e = &vcpu->cpuid_entries[i];
1632 if (e->function == function) {
1633 best = e;
1634 break;
1635 }
1636 /*
1637 * Both basic or both extended?
1638 */
1639 if (((e->function ^ function) & 0x80000000) == 0)
1640 if (!best || e->function > best->function)
1641 best = e;
1642 }
1643 if (best) {
1644 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1645 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1646 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1647 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1648 }
1649 kvm_arch_ops->decache_regs(vcpu);
1650 kvm_arch_ops->skip_emulated_instruction(vcpu);
1651}
1652EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1653
039576c0 1654static int pio_copy_data(struct kvm_vcpu *vcpu)
46fc1477 1655{
039576c0
AK		 1656 void *p = vcpu->pio_data;
1657 void *q;
1658 unsigned bytes;
1659 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1660
1661 kvm_arch_ops->vcpu_put(vcpu);
1662 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1663 PAGE_KERNEL);
1664 if (!q) {
1665 kvm_arch_ops->vcpu_load(vcpu);
1666 free_pio_guest_pages(vcpu);
1667 return -ENOMEM;
1668 }
1669 q += vcpu->pio.guest_page_offset;
1670 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1671 if (vcpu->pio.in)
1672 memcpy(q, p, bytes);
1673 else
1674 memcpy(p, q, bytes);
1675 q -= vcpu->pio.guest_page_offset;
1676 vunmap(q);
1677 kvm_arch_ops->vcpu_load(vcpu);
1678 free_pio_guest_pages(vcpu);
1679 return 0;
1680}
1681
1682static int complete_pio(struct kvm_vcpu *vcpu)
1683{
1684 struct kvm_pio_request *io = &vcpu->pio;
46fc1477 1685 long delta;
039576c0 1686 int r;
46fc1477
AK		 1687
1688 kvm_arch_ops->cache_regs(vcpu);
1689
1690 if (!io->string) {
039576c0
AK		 1691 if (io->in)
1692 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
46fc1477
AK		 1693 io->size);
1694 } else {
039576c0
AK		 1695 if (io->in) {
1696 r = pio_copy_data(vcpu);
1697 if (r) {
1698 kvm_arch_ops->cache_regs(vcpu);
1699 return r;
1700 }
1701 }
1702
46fc1477
AK		 1703 delta = 1;
1704 if (io->rep) {
039576c0 1705 delta *= io->cur_count;
46fc1477
AK		 1706 /*
1707 * The size of the register should really depend on
1708 * current address size.
1709 */
1710 vcpu->regs[VCPU_REGS_RCX] -= delta;
1711 }
039576c0 1712 if (io->down)
46fc1477
AK		 1713 delta = -delta;
1714 delta *= io->size;
039576c0 1715 if (io->in)
46fc1477
AK		 1716 vcpu->regs[VCPU_REGS_RDI] += delta;
1717 else
1718 vcpu->regs[VCPU_REGS_RSI] += delta;
1719 }
1720
46fc1477
AK		 1721 vcpu->run->io_completed = 0;
1722
1723 kvm_arch_ops->decache_regs(vcpu);
1724
039576c0
AK		 1725 io->count -= io->cur_count;
1726 io->cur_count = 0;
1727
1728 if (!io->count)
1729 kvm_arch_ops->skip_emulated_instruction(vcpu);
1730 return 0;
46fc1477
AK		 1731}
1732
039576c0
AK		 1733int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1734 int size, unsigned long count, int string, int down,
1735 gva_t address, int rep, unsigned port)
1736{
1737 unsigned now, in_page;
1738 int i;
1739 int nr_pages = 1;
1740 struct page *page;
1741
1742 vcpu->run->exit_reason = KVM_EXIT_IO;
1743 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1744 vcpu->run->io.size = size;
1745 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1746 vcpu->run->io.count = count;
1747 vcpu->run->io.port = port;
1748 vcpu->pio.count = count;
1749 vcpu->pio.cur_count = count;
1750 vcpu->pio.size = size;
1751 vcpu->pio.in = in;
1752 vcpu->pio.string = string;
1753 vcpu->pio.down = down;
1754 vcpu->pio.guest_page_offset = offset_in_page(address);
1755 vcpu->pio.rep = rep;
1756
1757 if (!string) {
1758 kvm_arch_ops->cache_regs(vcpu);
1759 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1760 kvm_arch_ops->decache_regs(vcpu);
1761 return 0;
1762 }
1763
1764 if (!count) {
1765 kvm_arch_ops->skip_emulated_instruction(vcpu);
1766 return 1;
1767 }
1768
1769 now = min(count, PAGE_SIZE / size);
1770
1771 if (!down)
1772 in_page = PAGE_SIZE - offset_in_page(address);
1773 else
1774 in_page = offset_in_page(address) + size;
1775 now = min(count, (unsigned long)in_page / size);
1776 if (!now) {
1777 /*
1778 * String I/O straddles page boundary. Pin two guest pages
1779 * so that we satisfy atomicity constraints. Do just one
1780 * transaction to avoid complexity.
1781 */
1782 nr_pages = 2;
1783 now = 1;
1784 }
1785 if (down) {
1786 /*
1787 * String I/O in reverse. Yuck. Kill the guest, fix later.
1788 */
1789 printk(KERN_ERR "kvm: guest string pio down\n");
1790 inject_gp(vcpu);
1791 return 1;
1792 }
1793 vcpu->run->io.count = now;
1794 vcpu->pio.cur_count = now;
1795
1796 for (i = 0; i < nr_pages; ++i) {
1797 spin_lock(&vcpu->kvm->lock);
1798 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1799 if (page)
1800 get_page(page);
1801 vcpu->pio.guest_pages[i] = page;
1802 spin_unlock(&vcpu->kvm->lock);
1803 if (!page) {
1804 inject_gp(vcpu);
1805 free_pio_guest_pages(vcpu);
1806 return 1;
1807 }
1808 }
1809
1810 if (!vcpu->pio.in)
1811 return pio_copy_data(vcpu);
1812 return 0;
1813}
1814EXPORT_SYMBOL_GPL(kvm_setup_pio);
1815
bccf2150 1816static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
6aa8b732 1817{
6aa8b732 1818 int r;
1961d276 1819 sigset_t sigsaved;
6aa8b732 1820
bccf2150 1821 vcpu_load(vcpu);
6aa8b732 1822
1961d276
AK		 1823 if (vcpu->sigset_active)
1824 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
1825
54810342
DL		 1826 /* re-sync apic's tpr */
1827 vcpu->cr8 = kvm_run->cr8;
1828
46fc1477 1829 if (kvm_run->io_completed) {
039576c0
AK		 1830 if (vcpu->pio.cur_count) {
1831 r = complete_pio(vcpu);
1832 if (r)
1833 goto out;
1834 } else {
46fc1477
AK		 1835 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1836 vcpu->mmio_read_completed = 1;
1837 }
6aa8b732
AK		 1838 }
1839
1840 vcpu->mmio_needed = 0;
1841
8eb7d334 1842 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
b4e63f56
AK		 1843 kvm_arch_ops->cache_regs(vcpu);
1844 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
1845 kvm_arch_ops->decache_regs(vcpu);
1846 }
1847
6aa8b732
AK		 1848 r = kvm_arch_ops->run(vcpu, kvm_run);
1849
039576c0 1850out:
1961d276
AK		 1851 if (vcpu->sigset_active)
1852 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1853
6aa8b732
AK		 1854 vcpu_put(vcpu);
1855 return r;
1856}
1857
bccf2150
AK		 1858static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
1859 struct kvm_regs *regs)
6aa8b732 1860{
bccf2150 1861 vcpu_load(vcpu);
6aa8b732
AK		 1862
1863 kvm_arch_ops->cache_regs(vcpu);
1864
1865 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1866 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1867 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1868 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1869 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1870 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1871 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1872 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1873#ifdef CONFIG_X86_64
6aa8b732
AK		 1874 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1875 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1876 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1877 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1878 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1879 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1880 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1881 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1882#endif
1883
1884 regs->rip = vcpu->rip;
1885 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1886
1887 /*
1888 * Don't leak debug flags in case they were set for guest debugging
1889 */
1890 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1891 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1892
1893 vcpu_put(vcpu);
1894
1895 return 0;
1896}
1897
bccf2150
AK		 1898static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
1899 struct kvm_regs *regs)
6aa8b732 1900{
bccf2150 1901 vcpu_load(vcpu);
6aa8b732
AK		 1902
1903 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1904 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1905 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1906 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1907 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1908 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1909 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1910 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1911#ifdef CONFIG_X86_64
6aa8b732
AK		 1912 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1913 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1914 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1915 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1916 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1917 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1918 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1919 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1920#endif
1921
1922 vcpu->rip = regs->rip;
1923 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1924
1925 kvm_arch_ops->decache_regs(vcpu);
1926
1927 vcpu_put(vcpu);
1928
1929 return 0;
1930}
1931
1932static void get_segment(struct kvm_vcpu *vcpu,
1933 struct kvm_segment *var, int seg)
1934{
1935 return kvm_arch_ops->get_segment(vcpu, var, seg);
1936}
1937
bccf2150
AK		 1938static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1939 struct kvm_sregs *sregs)
6aa8b732 1940{
6aa8b732
AK		 1941 struct descriptor_table dt;
1942
bccf2150 1943 vcpu_load(vcpu);
6aa8b732
AK		 1944
1945 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1946 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1947 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1948 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1949 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1950 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1951
1952 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1953 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1954
1955 kvm_arch_ops->get_idt(vcpu, &dt);
1956 sregs->idt.limit = dt.limit;
1957 sregs->idt.base = dt.base;
1958 kvm_arch_ops->get_gdt(vcpu, &dt);
1959 sregs->gdt.limit = dt.limit;
1960 sregs->gdt.base = dt.base;
1961
399badf3 1962 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1963 sregs->cr0 = vcpu->cr0;
1964 sregs->cr2 = vcpu->cr2;
1965 sregs->cr3 = vcpu->cr3;
1966 sregs->cr4 = vcpu->cr4;
1967 sregs->cr8 = vcpu->cr8;
1968 sregs->efer = vcpu->shadow_efer;
1969 sregs->apic_base = vcpu->apic_base;
1970
1971 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1972 sizeof sregs->interrupt_bitmap);
1973
1974 vcpu_put(vcpu);
1975
1976 return 0;
1977}
1978
1979static void set_segment(struct kvm_vcpu *vcpu,
1980 struct kvm_segment *var, int seg)
1981{
1982 return kvm_arch_ops->set_segment(vcpu, var, seg);
1983}
1984
bccf2150
AK		 1985static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
1986 struct kvm_sregs *sregs)
6aa8b732 1987{
6aa8b732
AK		 1988 int mmu_reset_needed = 0;
1989 int i;
1990 struct descriptor_table dt;
1991
bccf2150 1992 vcpu_load(vcpu);
6aa8b732 1993
6aa8b732
AK		 1994 dt.limit = sregs->idt.limit;
1995 dt.base = sregs->idt.base;
1996 kvm_arch_ops->set_idt(vcpu, &dt);
1997 dt.limit = sregs->gdt.limit;
1998 dt.base = sregs->gdt.base;
1999 kvm_arch_ops->set_gdt(vcpu, &dt);
2000
2001 vcpu->cr2 = sregs->cr2;
2002 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2003 vcpu->cr3 = sregs->cr3;
2004
2005 vcpu->cr8 = sregs->cr8;
2006
2007 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 2008#ifdef CONFIG_X86_64
6aa8b732
AK		 2009 kvm_arch_ops->set_efer(vcpu, sregs->efer);
2010#endif
2011 vcpu->apic_base = sregs->apic_base;
2012
399badf3
AK		 2013 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
2014
6aa8b732 2015 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
f6528b03 2016 kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
6aa8b732
AK		 2017
2018 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2019 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 2020 if (!is_long_mode(vcpu) && is_pae(vcpu))
2021 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 2022
2023 if (mmu_reset_needed)
2024 kvm_mmu_reset_context(vcpu);
2025
2026 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2027 sizeof vcpu->irq_pending);
2028 vcpu->irq_summary = 0;
2029 for (i = 0; i < NR_IRQ_WORDS; ++i)
2030 if (vcpu->irq_pending[i])
2031 __set_bit(i, &vcpu->irq_summary);
2032
024aa1c0
AK		 2033 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2034 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2035 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2036 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2037 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2038 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2039
2040 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2041 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2042
6aa8b732
AK		 2043 vcpu_put(vcpu);
2044
2045 return 0;
2046}
2047
2048/*
2049 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2050 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 2051 *
2052 * This list is modified at module load time to reflect the
2053 * capabilities of the host cpu.
6aa8b732
AK		 2054 */
2055static u32 msrs_to_save[] = {
2056 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2057 MSR_K6_STAR,
05b3e0c2 2058#ifdef CONFIG_X86_64
6aa8b732
AK		 2059 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2060#endif
2061 MSR_IA32_TIME_STAMP_COUNTER,
2062};
2063
bf591b24
MR		 2064static unsigned num_msrs_to_save;
2065
6f00e68f
AK		 2066static u32 emulated_msrs[] = {
2067 MSR_IA32_MISC_ENABLE,
2068};
2069
bf591b24
MR		 2070static __init void kvm_init_msr_list(void)
2071{
2072 u32 dummy[2];
2073 unsigned i, j;
2074
2075 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2076 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2077 continue;
2078 if (j < i)
2079 msrs_to_save[j] = msrs_to_save[i];
2080 j++;
2081 }
2082 num_msrs_to_save = j;
2083}
6aa8b732
AK		 2084
2085/*
2086 * Adapt set_msr() to msr_io()'s calling convention
2087 */
2088static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2089{
2090 return set_msr(vcpu, index, *data);
2091}
2092
2093/*
2094 * Read or write a bunch of msrs. All parameters are kernel addresses.
2095 *
2096 * @return number of msrs set successfully.
2097 */
bccf2150 2098static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
6aa8b732
AK		 2099 struct kvm_msr_entry *entries,
2100 int (*do_msr)(struct kvm_vcpu *vcpu,
2101 unsigned index, u64 *data))
2102{
6aa8b732
AK		 2103 int i;
2104
bccf2150 2105 vcpu_load(vcpu);
6aa8b732
AK		 2106
2107 for (i = 0; i < msrs->nmsrs; ++i)
2108 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2109 break;
2110
2111 vcpu_put(vcpu);
2112
2113 return i;
2114}
2115
2116/*
2117 * Read or write a bunch of msrs. Parameters are user addresses.
2118 *
2119 * @return number of msrs set successfully.
2120 */
bccf2150 2121static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
6aa8b732
AK		 2122 int (*do_msr)(struct kvm_vcpu *vcpu,
2123 unsigned index, u64 *data),
2124 int writeback)
2125{
2126 struct kvm_msrs msrs;
2127 struct kvm_msr_entry *entries;
2128 int r, n;
2129 unsigned size;
2130
2131 r = -EFAULT;
2132 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2133 goto out;
2134
2135 r = -E2BIG;
2136 if (msrs.nmsrs >= MAX_IO_MSRS)
2137 goto out;
2138
2139 r = -ENOMEM;
2140 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2141 entries = vmalloc(size);
2142 if (!entries)
2143 goto out;
2144
2145 r = -EFAULT;
2146 if (copy_from_user(entries, user_msrs->entries, size))
2147 goto out_free;
2148
bccf2150 2149 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
6aa8b732
AK		 2150 if (r < 0)
2151 goto out_free;
2152
2153 r = -EFAULT;
2154 if (writeback && copy_to_user(user_msrs->entries, entries, size))
2155 goto out_free;
2156
2157 r = n;
2158
2159out_free:
2160 vfree(entries);
2161out:
2162 return r;
2163}
2164
2165/*
2166 * Translate a guest virtual address to a guest physical address.
2167 */
bccf2150
AK		 2168static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2169 struct kvm_translation *tr)
6aa8b732
AK		 2170{
2171 unsigned long vaddr = tr->linear_address;
6aa8b732
AK		 2172 gpa_t gpa;
2173
bccf2150
AK		 2174 vcpu_load(vcpu);
2175 spin_lock(&vcpu->kvm->lock);
6aa8b732
AK		 2176 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2177 tr->physical_address = gpa;
2178 tr->valid = gpa != UNMAPPED_GVA;
2179 tr->writeable = 1;
2180 tr->usermode = 0;
bccf2150 2181 spin_unlock(&vcpu->kvm->lock);
6aa8b732
AK		 2182 vcpu_put(vcpu);
2183
2184 return 0;
2185}
2186
bccf2150
AK		 2187static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2188 struct kvm_interrupt *irq)
6aa8b732 2189{
6aa8b732
AK		 2190 if (irq->irq < 0 || irq->irq >= 256)
2191 return -EINVAL;
bccf2150 2192 vcpu_load(vcpu);
6aa8b732
AK		 2193
2194 set_bit(irq->irq, vcpu->irq_pending);
2195 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2196
2197 vcpu_put(vcpu);
2198
2199 return 0;
2200}
2201
bccf2150
AK		 2202static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2203 struct kvm_debug_guest *dbg)
6aa8b732 2204{
6aa8b732
AK		 2205 int r;
2206
bccf2150 2207 vcpu_load(vcpu);
6aa8b732
AK		 2208
2209 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
2210
2211 vcpu_put(vcpu);
2212
2213 return r;
2214}
2215
9a2bb7f4
AK		 2216static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2217 unsigned long address,
2218 int *type)
2219{
2220 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2221 unsigned long pgoff;
2222 struct page *page;
2223
2224 *type = VM_FAULT_MINOR;
2225 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
039576c0
AK		 2226 if (pgoff == 0)
2227 page = virt_to_page(vcpu->run);
2228 else if (pgoff == KVM_PIO_PAGE_OFFSET)
2229 page = virt_to_page(vcpu->pio_data);
2230 else
9a2bb7f4 2231 return NOPAGE_SIGBUS;
9a2bb7f4
AK		 2232 get_page(page);
2233 return page;
2234}
2235
2236static struct vm_operations_struct kvm_vcpu_vm_ops = {
2237 .nopage = kvm_vcpu_nopage,
2238};
2239
2240static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2241{
2242 vma->vm_ops = &kvm_vcpu_vm_ops;
2243 return 0;
2244}
2245
bccf2150
AK		 2246static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2247{
2248 struct kvm_vcpu *vcpu = filp->private_data;
2249
2250 fput(vcpu->kvm->filp);
2251 return 0;
2252}
2253
2254static struct file_operations kvm_vcpu_fops = {
2255 .release = kvm_vcpu_release,
2256 .unlocked_ioctl = kvm_vcpu_ioctl,
2257 .compat_ioctl = kvm_vcpu_ioctl,
9a2bb7f4 2258 .mmap = kvm_vcpu_mmap,
bccf2150
AK		 2259};
2260
2261/*
2262 * Allocates an inode for the vcpu.
2263 */
2264static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2265{
2266 int fd, r;
2267 struct inode *inode;
2268 struct file *file;
2269
2270 atomic_inc(&vcpu->kvm->filp->f_count);
2271 inode = kvmfs_inode(&kvm_vcpu_fops);
2272 if (IS_ERR(inode)) {
2273 r = PTR_ERR(inode);
2274 goto out1;
2275 }
2276
2277 file = kvmfs_file(inode, vcpu);
2278 if (IS_ERR(file)) {
2279 r = PTR_ERR(file);
2280 goto out2;
2281 }
2282
2283 r = get_unused_fd();
2284 if (r < 0)
2285 goto out3;
2286 fd = r;
2287 fd_install(fd, file);
2288
2289 return fd;
2290
2291out3:
2292 fput(file);
2293out2:
2294 iput(inode);
2295out1:
2296 fput(vcpu->kvm->filp);
2297 return r;
2298}
2299
c5ea7660
AK		 2300/*
2301 * Creates some virtual cpus. Good luck creating more than one.
2302 */
2303static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2304{
2305 int r;
2306 struct kvm_vcpu *vcpu;
9a2bb7f4 2307 struct page *page;
c5ea7660
AK		 2308
2309 r = -EINVAL;
2310 if (!valid_vcpu(n))
2311 goto out;
2312
2313 vcpu = &kvm->vcpus[n];
2314
2315 mutex_lock(&vcpu->mutex);
2316
2317 if (vcpu->vmcs) {
2318 mutex_unlock(&vcpu->mutex);
2319 return -EEXIST;
2320 }
2321
9a2bb7f4
AK		 2322 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2323 r = -ENOMEM;
2324 if (!page)
2325 goto out_unlock;
2326 vcpu->run = page_address(page);
2327
039576c0
AK		 2328 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2329 r = -ENOMEM;
2330 if (!page)
2331 goto out_free_run;
2332 vcpu->pio_data = page_address(page);
2333
c5ea7660
AK		 2334 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
2335 FX_IMAGE_ALIGN);
2336 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
d917a6b9 2337 vcpu->cr0 = 0x10;
c5ea7660
AK		 2338
2339 r = kvm_arch_ops->vcpu_create(vcpu);
2340 if (r < 0)
2341 goto out_free_vcpus;
2342
2343 r = kvm_mmu_create(vcpu);
2344 if (r < 0)
2345 goto out_free_vcpus;
2346
2347 kvm_arch_ops->vcpu_load(vcpu);
2348 r = kvm_mmu_setup(vcpu);
2349 if (r >= 0)
2350 r = kvm_arch_ops->vcpu_setup(vcpu);
2351 vcpu_put(vcpu);
2352
2353 if (r < 0)
2354 goto out_free_vcpus;
2355
bccf2150
AK		 2356 r = create_vcpu_fd(vcpu);
2357 if (r < 0)
2358 goto out_free_vcpus;
2359
2360 return r;
c5ea7660
AK		 2361
2362out_free_vcpus:
2363 kvm_free_vcpu(vcpu);
039576c0
AK		 2364out_free_run:
2365 free_page((unsigned long)vcpu->run);
2366 vcpu->run = NULL;
9a2bb7f4 2367out_unlock:
c5ea7660
AK		 2368 mutex_unlock(&vcpu->mutex);
2369out:
2370 return r;
2371}
2372
06465c5a
AK		 2373static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2374 struct kvm_cpuid *cpuid,
2375 struct kvm_cpuid_entry __user *entries)
2376{
2377 int r;
2378
2379 r = -E2BIG;
2380 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2381 goto out;
2382 r = -EFAULT;
2383 if (copy_from_user(&vcpu->cpuid_entries, entries,
2384 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2385 goto out;
2386 vcpu->cpuid_nent = cpuid->nent;
2387 return 0;
2388
2389out:
2390 return r;
2391}
2392
1961d276
AK		 2393static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2394{
2395 if (sigset) {
2396 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2397 vcpu->sigset_active = 1;
2398 vcpu->sigset = *sigset;
2399 } else
2400 vcpu->sigset_active = 0;
2401 return 0;
2402}
2403
b8836737
AK		 2404/*
2405 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2406 * we have asm/x86/processor.h
2407 */
2408struct fxsave {
2409 u16 cwd;
2410 u16 swd;
2411 u16 twd;
2412 u16 fop;
2413 u64 rip;
2414 u64 rdp;
2415 u32 mxcsr;
2416 u32 mxcsr_mask;
2417 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2418#ifdef CONFIG_X86_64
2419 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2420#else
2421 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2422#endif
2423};
2424
2425static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2426{
2427 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2428
2429 vcpu_load(vcpu);
2430
2431 memcpy(fpu->fpr, fxsave->st_space, 128);
2432 fpu->fcw = fxsave->cwd;
2433 fpu->fsw = fxsave->swd;
2434 fpu->ftwx = fxsave->twd;
2435 fpu->last_opcode = fxsave->fop;
2436 fpu->last_ip = fxsave->rip;
2437 fpu->last_dp = fxsave->rdp;
2438 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2439
2440 vcpu_put(vcpu);
2441
2442 return 0;
2443}
2444
2445static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2446{
2447 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2448
2449 vcpu_load(vcpu);
2450
2451 memcpy(fxsave->st_space, fpu->fpr, 128);
2452 fxsave->cwd = fpu->fcw;
2453 fxsave->swd = fpu->fsw;
2454 fxsave->twd = fpu->ftwx;
2455 fxsave->fop = fpu->last_opcode;
2456 fxsave->rip = fpu->last_ip;
2457 fxsave->rdp = fpu->last_dp;
2458 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2459
2460 vcpu_put(vcpu);
2461
2462 return 0;
2463}
2464
bccf2150
AK		 2465static long kvm_vcpu_ioctl(struct file *filp,
2466 unsigned int ioctl, unsigned long arg)
6aa8b732 2467{
bccf2150 2468 struct kvm_vcpu *vcpu = filp->private_data;
2f366987 2469 void __user *argp = (void __user *)arg;
6aa8b732
AK		 2470 int r = -EINVAL;
2471
2472 switch (ioctl) {
9a2bb7f4 2473 case KVM_RUN:
f0fe5108
AK		 2474 r = -EINVAL;
2475 if (arg)
2476 goto out;
9a2bb7f4 2477 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
6aa8b732 2478 break;
6aa8b732
AK		 2479 case KVM_GET_REGS: {
2480 struct kvm_regs kvm_regs;
2481
bccf2150
AK		 2482 memset(&kvm_regs, 0, sizeof kvm_regs);
2483 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2484 if (r)
2485 goto out;
2486 r = -EFAULT;
2f366987 2487 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 2488 goto out;
2489 r = 0;
2490 break;
2491 }
2492 case KVM_SET_REGS: {
2493 struct kvm_regs kvm_regs;
2494
2495 r = -EFAULT;
2f366987 2496 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732 2497 goto out;
bccf2150 2498 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2499 if (r)
2500 goto out;
2501 r = 0;
2502 break;
2503 }
2504 case KVM_GET_SREGS: {
2505 struct kvm_sregs kvm_sregs;
2506
bccf2150
AK		 2507 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2508 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2509 if (r)
2510 goto out;
2511 r = -EFAULT;
2f366987 2512 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 2513 goto out;
2514 r = 0;
2515 break;
2516 }
2517 case KVM_SET_SREGS: {
2518 struct kvm_sregs kvm_sregs;
2519
2520 r = -EFAULT;
2f366987 2521 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732 2522 goto out;
bccf2150 2523 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2524 if (r)
2525 goto out;
2526 r = 0;
2527 break;
2528 }
2529 case KVM_TRANSLATE: {
2530 struct kvm_translation tr;
2531
2532 r = -EFAULT;
2f366987 2533 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732 2534 goto out;
bccf2150 2535 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
6aa8b732
AK		 2536 if (r)
2537 goto out;
2538 r = -EFAULT;
2f366987 2539 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 2540 goto out;
2541 r = 0;
2542 break;
2543 }
2544 case KVM_INTERRUPT: {
2545 struct kvm_interrupt irq;
2546
2547 r = -EFAULT;
2f366987 2548 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732 2549 goto out;
bccf2150 2550 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
6aa8b732
AK		 2551 if (r)
2552 goto out;
2553 r = 0;
2554 break;
2555 }
2556 case KVM_DEBUG_GUEST: {
2557 struct kvm_debug_guest dbg;
2558
2559 r = -EFAULT;
2f366987 2560 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732 2561 goto out;
bccf2150 2562 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
6aa8b732
AK		 2563 if (r)
2564 goto out;
2565 r = 0;
2566 break;
2567 }
bccf2150
AK		 2568 case KVM_GET_MSRS:
2569 r = msr_io(vcpu, argp, get_msr, 1);
2570 break;
2571 case KVM_SET_MSRS:
2572 r = msr_io(vcpu, argp, do_set_msr, 0);
2573 break;
06465c5a
AK		 2574 case KVM_SET_CPUID: {
2575 struct kvm_cpuid __user *cpuid_arg = argp;
2576 struct kvm_cpuid cpuid;
2577
2578 r = -EFAULT;
2579 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2580 goto out;
2581 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2582 if (r)
2583 goto out;
2584 break;
2585 }
1961d276
AK		 2586 case KVM_SET_SIGNAL_MASK: {
2587 struct kvm_signal_mask __user *sigmask_arg = argp;
2588 struct kvm_signal_mask kvm_sigmask;
2589 sigset_t sigset, *p;
2590
2591 p = NULL;
2592 if (argp) {
2593 r = -EFAULT;
2594 if (copy_from_user(&kvm_sigmask, argp,
2595 sizeof kvm_sigmask))
2596 goto out;
2597 r = -EINVAL;
2598 if (kvm_sigmask.len != sizeof sigset)
2599 goto out;
2600 r = -EFAULT;
2601 if (copy_from_user(&sigset, sigmask_arg->sigset,
2602 sizeof sigset))
2603 goto out;
2604 p = &sigset;
2605 }
2606 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2607 break;
2608 }
b8836737
AK		 2609 case KVM_GET_FPU: {
2610 struct kvm_fpu fpu;
2611
2612 memset(&fpu, 0, sizeof fpu);
2613 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
2614 if (r)
2615 goto out;
2616 r = -EFAULT;
2617 if (copy_to_user(argp, &fpu, sizeof fpu))
2618 goto out;
2619 r = 0;
2620 break;
2621 }
2622 case KVM_SET_FPU: {
2623 struct kvm_fpu fpu;
2624
2625 r = -EFAULT;
2626 if (copy_from_user(&fpu, argp, sizeof fpu))
2627 goto out;
2628 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
2629 if (r)
2630 goto out;
2631 r = 0;
2632 break;
2633 }
bccf2150
AK		 2634 default:
2635 ;
2636 }
2637out:
2638 return r;
2639}
2640
2641static long kvm_vm_ioctl(struct file *filp,
2642 unsigned int ioctl, unsigned long arg)
2643{
2644 struct kvm *kvm = filp->private_data;
2645 void __user *argp = (void __user *)arg;
2646 int r = -EINVAL;
2647
2648 switch (ioctl) {
2649 case KVM_CREATE_VCPU:
2650 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2651 if (r < 0)
2652 goto out;
2653 break;
6aa8b732
AK		 2654 case KVM_SET_MEMORY_REGION: {
2655 struct kvm_memory_region kvm_mem;
2656
2657 r = -EFAULT;
2f366987 2658 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
6aa8b732 2659 goto out;
2c6f5df9 2660 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
6aa8b732
AK		 2661 if (r)
2662 goto out;
2663 break;
2664 }
2665 case KVM_GET_DIRTY_LOG: {
2666 struct kvm_dirty_log log;
2667
2668 r = -EFAULT;
2f366987 2669 if (copy_from_user(&log, argp, sizeof log))
6aa8b732 2670 goto out;
2c6f5df9 2671 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
6aa8b732
AK		 2672 if (r)
2673 goto out;
2674 break;
2675 }
e8207547
AK		 2676 case KVM_SET_MEMORY_ALIAS: {
2677 struct kvm_memory_alias alias;
2678
2679 r = -EFAULT;
2680 if (copy_from_user(&alias, argp, sizeof alias))
2681 goto out;
2682 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
2683 if (r)
2684 goto out;
2685 break;
2686 }
f17abe9a
AK		 2687 default:
2688 ;
2689 }
2690out:
2691 return r;
2692}
2693
2694static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2695 unsigned long address,
2696 int *type)
2697{
2698 struct kvm *kvm = vma->vm_file->private_data;
2699 unsigned long pgoff;
f17abe9a
AK		 2700 struct page *page;
2701
2702 *type = VM_FAULT_MINOR;
2703 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
954bbbc2 2704 page = gfn_to_page(kvm, pgoff);
f17abe9a
AK		 2705 if (!page)
2706 return NOPAGE_SIGBUS;
2707 get_page(page);
2708 return page;
2709}
2710
2711static struct vm_operations_struct kvm_vm_vm_ops = {
2712 .nopage = kvm_vm_nopage,
2713};
2714
2715static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2716{
2717 vma->vm_ops = &kvm_vm_vm_ops;
2718 return 0;
2719}
2720
2721static struct file_operations kvm_vm_fops = {
2722 .release = kvm_vm_release,
2723 .unlocked_ioctl = kvm_vm_ioctl,
2724 .compat_ioctl = kvm_vm_ioctl,
2725 .mmap = kvm_vm_mmap,
2726};
2727
2728static int kvm_dev_ioctl_create_vm(void)
2729{
2730 int fd, r;
2731 struct inode *inode;
2732 struct file *file;
2733 struct kvm *kvm;
2734
2735 inode = kvmfs_inode(&kvm_vm_fops);
2736 if (IS_ERR(inode)) {
2737 r = PTR_ERR(inode);
2738 goto out1;
2739 }
2740
2741 kvm = kvm_create_vm();
2742 if (IS_ERR(kvm)) {
2743 r = PTR_ERR(kvm);
2744 goto out2;
2745 }
2746
2747 file = kvmfs_file(inode, kvm);
2748 if (IS_ERR(file)) {
2749 r = PTR_ERR(file);
2750 goto out3;
2751 }
bccf2150 2752 kvm->filp = file;
f17abe9a
AK		 2753
2754 r = get_unused_fd();
2755 if (r < 0)
2756 goto out4;
2757 fd = r;
2758 fd_install(fd, file);
2759
2760 return fd;
2761
2762out4:
2763 fput(file);
2764out3:
2765 kvm_destroy_vm(kvm);
2766out2:
2767 iput(inode);
2768out1:
2769 return r;
2770}
2771
2772static long kvm_dev_ioctl(struct file *filp,
2773 unsigned int ioctl, unsigned long arg)
2774{
2775 void __user *argp = (void __user *)arg;
07c45a36 2776 long r = -EINVAL;
f17abe9a
AK		 2777
2778 switch (ioctl) {
2779 case KVM_GET_API_VERSION:
f0fe5108
AK		 2780 r = -EINVAL;
2781 if (arg)
2782 goto out;
f17abe9a
AK		 2783 r = KVM_API_VERSION;
2784 break;
2785 case KVM_CREATE_VM:
f0fe5108
AK		 2786 r = -EINVAL;
2787 if (arg)
2788 goto out;
f17abe9a
AK		 2789 r = kvm_dev_ioctl_create_vm();
2790 break;
6aa8b732 2791 case KVM_GET_MSR_INDEX_LIST: {
2f366987 2792 struct kvm_msr_list __user *user_msr_list = argp;
6aa8b732
AK		 2793 struct kvm_msr_list msr_list;
2794 unsigned n;
2795
2796 r = -EFAULT;
2797 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2798 goto out;
2799 n = msr_list.nmsrs;
6f00e68f 2800 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
6aa8b732
AK		 2801 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2802 goto out;
2803 r = -E2BIG;
bf591b24 2804 if (n < num_msrs_to_save)
6aa8b732
AK		 2805 goto out;
2806 r = -EFAULT;
2807 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 2808 num_msrs_to_save * sizeof(u32)))
6aa8b732 2809 goto out;
6f00e68f
AK		 2810 if (copy_to_user(user_msr_list->indices
2811 + num_msrs_to_save * sizeof(u32),
2812 &emulated_msrs,
2813 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2814 goto out;
6aa8b732 2815 r = 0;
cc1d8955 2816 break;
6aa8b732 2817 }
5d308f45
AK		 2818 case KVM_CHECK_EXTENSION:
2819 /*
2820 * No extensions defined at present.
2821 */
2822 r = 0;
2823 break;
07c45a36
AK		 2824 case KVM_GET_VCPU_MMAP_SIZE:
2825 r = -EINVAL;
2826 if (arg)
2827 goto out;
039576c0 2828 r = 2 * PAGE_SIZE;
07c45a36 2829 break;
6aa8b732
AK		 2830 default:
2831 ;
2832 }
2833out:
2834 return r;
2835}
2836
6aa8b732
AK		 2837static struct file_operations kvm_chardev_ops = {
2838 .open = kvm_dev_open,
2839 .release = kvm_dev_release,
2840 .unlocked_ioctl = kvm_dev_ioctl,
2841 .compat_ioctl = kvm_dev_ioctl,
6aa8b732
AK		 2842};
2843
2844static struct miscdevice kvm_dev = {
bbe4432e 2845 KVM_MINOR,
6aa8b732
AK		 2846 "kvm",
2847 &kvm_chardev_ops,
2848};
2849
2850static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2851 void *v)
2852{
2853 if (val == SYS_RESTART) {
2854 /*
2855 * Some (well, at least mine) BIOSes hang on reboot if
2856 * in vmx root mode.
2857 */
2858 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
8b6d44c7 2859 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2860 }
2861 return NOTIFY_OK;
2862}
2863
2864static struct notifier_block kvm_reboot_notifier = {
2865 .notifier_call = kvm_reboot,
2866 .priority = 0,
2867};
2868
774c47f1
AK		 2869/*
2870 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2871 * cached on it.
2872 */
2873static void decache_vcpus_on_cpu(int cpu)
2874{
2875 struct kvm *vm;
2876 struct kvm_vcpu *vcpu;
2877 int i;
2878
2879 spin_lock(&kvm_lock);
2880 list_for_each_entry(vm, &vm_list, vm_list)
2881 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2882 vcpu = &vm->vcpus[i];
2883 /*
2884 * If the vcpu is locked, then it is running on some
2885 * other cpu and therefore it is not cached on the
2886 * cpu in question.
2887 *
2888 * If it's not locked, check the last cpu it executed
2889 * on.
2890 */
2891 if (mutex_trylock(&vcpu->mutex)) {
2892 if (vcpu->cpu == cpu) {
2893 kvm_arch_ops->vcpu_decache(vcpu);
2894 vcpu->cpu = -1;
2895 }
2896 mutex_unlock(&vcpu->mutex);
2897 }
2898 }
2899 spin_unlock(&kvm_lock);
2900}
2901
2902static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2903 void *v)
2904{
2905 int cpu = (long)v;
2906
2907 switch (val) {
43934a38 2908 case CPU_DOWN_PREPARE:
774c47f1 2909 case CPU_UP_CANCELED:
43934a38
JK		 2910 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2911 cpu);
774c47f1
AK		 2912 decache_vcpus_on_cpu(cpu);
2913 smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
2914 NULL, 0, 1);
2915 break;
43934a38
JK		 2916 case CPU_ONLINE:
2917 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2918 cpu);
774c47f1
AK		 2919 smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
2920 NULL, 0, 1);
2921 break;
2922 }
2923 return NOTIFY_OK;
2924}
2925
2926static struct notifier_block kvm_cpu_notifier = {
2927 .notifier_call = kvm_cpu_hotplug,
2928 .priority = 20, /* must be > scheduler priority */
2929};
2930
6aa8b732
AK		 2931static __init void kvm_init_debug(void)
2932{
2933 struct kvm_stats_debugfs_item *p;
2934
8b6d44c7 2935 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732
AK		 2936 for (p = debugfs_entries; p->name; ++p)
2937 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
2938 p->data);
2939}
2940
2941static void kvm_exit_debug(void)
2942{
2943 struct kvm_stats_debugfs_item *p;
2944
2945 for (p = debugfs_entries; p->name; ++p)
2946 debugfs_remove(p->dentry);
2947 debugfs_remove(debugfs_dir);
2948}
2949
59ae6c6b
AK		 2950static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2951{
2952 decache_vcpus_on_cpu(raw_smp_processor_id());
19d1408d 2953 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
59ae6c6b
AK		 2954 return 0;
2955}
2956
2957static int kvm_resume(struct sys_device *dev)
2958{
19d1408d 2959 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
59ae6c6b
AK		 2960 return 0;
2961}
2962
2963static struct sysdev_class kvm_sysdev_class = {
2964 set_kset_name("kvm"),
2965 .suspend = kvm_suspend,
2966 .resume = kvm_resume,
2967};
2968
2969static struct sys_device kvm_sysdev = {
2970 .id = 0,
2971 .cls = &kvm_sysdev_class,
2972};
2973
6aa8b732
AK		 2974hpa_t bad_page_address;
2975
37e29d90
AK		 2976static int kvmfs_get_sb(struct file_system_type *fs_type, int flags,
2977 const char *dev_name, void *data, struct vfsmount *mnt)
2978{
e9cdb1e3 2979 return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_SUPER_MAGIC, mnt);
37e29d90
AK		 2980}
2981
2982static struct file_system_type kvm_fs_type = {
2983 .name = "kvmfs",
2984 .get_sb = kvmfs_get_sb,
2985 .kill_sb = kill_anon_super,
2986};
2987
6aa8b732
AK		 2988int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
2989{
2990 int r;
2991
09db28b8
YI		 2992 if (kvm_arch_ops) {
2993 printk(KERN_ERR "kvm: already loaded the other module\n");
2994 return -EEXIST;
2995 }
2996
e097f35c 2997 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 2998 printk(KERN_ERR "kvm: no hardware support\n");
2999 return -EOPNOTSUPP;
3000 }
e097f35c 3001 if (ops->disabled_by_bios()) {
6aa8b732
AK		 3002 printk(KERN_ERR "kvm: disabled by bios\n");
3003 return -EOPNOTSUPP;
3004 }
3005
e097f35c
YI		 3006 kvm_arch_ops = ops;
3007
6aa8b732
AK		 3008 r = kvm_arch_ops->hardware_setup();
3009 if (r < 0)
ca45aaae 3010 goto out;
6aa8b732 3011
8b6d44c7 3012 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
774c47f1
AK		 3013 r = register_cpu_notifier(&kvm_cpu_notifier);
3014 if (r)
3015 goto out_free_1;
6aa8b732
AK		 3016 register_reboot_notifier(&kvm_reboot_notifier);
3017
59ae6c6b
AK		 3018 r = sysdev_class_register(&kvm_sysdev_class);
3019 if (r)
3020 goto out_free_2;
3021
3022 r = sysdev_register(&kvm_sysdev);
3023 if (r)
3024 goto out_free_3;
3025
6aa8b732
AK		 3026 kvm_chardev_ops.owner = module;
3027
3028 r = misc_register(&kvm_dev);
3029 if (r) {
3030 printk (KERN_ERR "kvm: misc device register failed\n");
3031 goto out_free;
3032 }
3033
3034 return r;
3035
3036out_free:
59ae6c6b
AK		 3037 sysdev_unregister(&kvm_sysdev);
3038out_free_3:
3039 sysdev_class_unregister(&kvm_sysdev_class);
3040out_free_2:
6aa8b732 3041 unregister_reboot_notifier(&kvm_reboot_notifier);
774c47f1
AK		 3042 unregister_cpu_notifier(&kvm_cpu_notifier);
3043out_free_1:
8b6d44c7 3044 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 3045 kvm_arch_ops->hardware_unsetup();
ca45aaae
AK		 3046out:
3047 kvm_arch_ops = NULL;
6aa8b732
AK		 3048 return r;
3049}
3050
3051void kvm_exit_arch(void)
3052{
3053 misc_deregister(&kvm_dev);
59ae6c6b
AK		 3054 sysdev_unregister(&kvm_sysdev);
3055 sysdev_class_unregister(&kvm_sysdev_class);
6aa8b732 3056 unregister_reboot_notifier(&kvm_reboot_notifier);
59ae6c6b 3057 unregister_cpu_notifier(&kvm_cpu_notifier);
8b6d44c7 3058 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 3059 kvm_arch_ops->hardware_unsetup();
09db28b8 3060 kvm_arch_ops = NULL;
6aa8b732
AK		 3061}
3062
3063static __init int kvm_init(void)
3064{
3065 static struct page *bad_page;
37e29d90
AK		 3066 int r;
3067
b5a33a75
AK		 3068 r = kvm_mmu_module_init();
3069 if (r)
3070 goto out4;
3071
37e29d90
AK		 3072 r = register_filesystem(&kvm_fs_type);
3073 if (r)
3074 goto out3;
6aa8b732 3075
37e29d90
AK		 3076 kvmfs_mnt = kern_mount(&kvm_fs_type);
3077 r = PTR_ERR(kvmfs_mnt);
3078 if (IS_ERR(kvmfs_mnt))
3079 goto out2;
6aa8b732
AK		 3080 kvm_init_debug();
3081
bf591b24
MR		 3082 kvm_init_msr_list();
3083
6aa8b732
AK		 3084 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3085 r = -ENOMEM;
3086 goto out;
3087 }
3088
3089 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3090 memset(__va(bad_page_address), 0, PAGE_SIZE);
3091
58e690e6 3092 return 0;
6aa8b732
AK		 3093
3094out:
3095 kvm_exit_debug();
37e29d90
AK		 3096 mntput(kvmfs_mnt);
3097out2:
3098 unregister_filesystem(&kvm_fs_type);
3099out3:
b5a33a75
AK		 3100 kvm_mmu_module_exit();
3101out4:
6aa8b732
AK		 3102 return r;
3103}
3104
3105static __exit void kvm_exit(void)
3106{
3107 kvm_exit_debug();
3108 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
37e29d90
AK		 3109 mntput(kvmfs_mnt);
3110 unregister_filesystem(&kvm_fs_type);
b5a33a75 3111 kvm_mmu_module_exit();
6aa8b732
AK		 3112}
3113
3114module_init(kvm_init)
3115module_exit(kvm_exit)
3116
3117EXPORT_SYMBOL_GPL(kvm_init_arch);
3118EXPORT_SYMBOL_GPL(kvm_exit_arch);
kernel source for telekom puls (alcatel/mediatek)