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KVM: Add missing calls to mark_page_dirty()
[deliverable/linux.git] / drivers / kvm / kvm_main.c
CommitLineData
6aa8b732
AK		 1/*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
8 *
9 * Authors:
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
12 *
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
15 *
16 */
17
18#include "kvm.h"
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
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
349static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
350{
bccf2150 351 if (!vcpu->vmcs)
1e8ba6fb
IM		 352 return;
353
bccf2150 354 vcpu_load(vcpu);
6aa8b732 355 kvm_mmu_destroy(vcpu);
08438475 356 vcpu_put(vcpu);
9ede74e0 357 kvm_arch_ops->vcpu_free(vcpu);
6aa8b732
AK		 358}
359
360static void kvm_free_vcpus(struct kvm *kvm)
361{
362 unsigned int i;
363
364 for (i = 0; i < KVM_MAX_VCPUS; ++i)
365 kvm_free_vcpu(&kvm->vcpus[i]);
366}
367
368static int kvm_dev_release(struct inode *inode, struct file *filp)
369{
f17abe9a
AK		 370 return 0;
371}
6aa8b732 372
f17abe9a
AK		 373static void kvm_destroy_vm(struct kvm *kvm)
374{
133de902
AK		 375 spin_lock(&kvm_lock);
376 list_del(&kvm->vm_list);
377 spin_unlock(&kvm_lock);
6aa8b732
AK		 378 kvm_free_vcpus(kvm);
379 kvm_free_physmem(kvm);
380 kfree(kvm);
f17abe9a
AK		 381}
382
383static int kvm_vm_release(struct inode *inode, struct file *filp)
384{
385 struct kvm *kvm = filp->private_data;
386
387 kvm_destroy_vm(kvm);
6aa8b732
AK		 388 return 0;
389}
390
391static void inject_gp(struct kvm_vcpu *vcpu)
392{
393 kvm_arch_ops->inject_gp(vcpu, 0);
394}
395
1342d353
AK		 396/*
397 * Load the pae pdptrs. Return true is they are all valid.
398 */
399static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
6aa8b732
AK		 400{
401 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
1342d353 402 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
6aa8b732
AK		 403 int i;
404 u64 pdpte;
405 u64 *pdpt;
1342d353 406 int ret;
6aa8b732
AK		 407 struct kvm_memory_slot *memslot;
408
409 spin_lock(&vcpu->kvm->lock);
410 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
411 /* FIXME: !memslot - emulate? 0xff? */
412 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
413
1342d353 414 ret = 1;
6aa8b732
AK		 415 for (i = 0; i < 4; ++i) {
416 pdpte = pdpt[offset + i];
1342d353
AK		 417 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
418 ret = 0;
419 goto out;
420 }
6aa8b732
AK		 421 }
422
1342d353
AK		 423 for (i = 0; i < 4; ++i)
424 vcpu->pdptrs[i] = pdpt[offset + i];
425
426out:
6aa8b732
AK		 427 kunmap_atomic(pdpt, KM_USER0);
428 spin_unlock(&vcpu->kvm->lock);
429
1342d353 430 return ret;
6aa8b732
AK		 431}
432
433void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
434{
435 if (cr0 & CR0_RESEVED_BITS) {
436 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
437 cr0, vcpu->cr0);
438 inject_gp(vcpu);
439 return;
440 }
441
442 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
443 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
444 inject_gp(vcpu);
445 return;
446 }
447
448 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
449 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
450 "and a clear PE flag\n");
451 inject_gp(vcpu);
452 return;
453 }
454
455 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 456#ifdef CONFIG_X86_64
6aa8b732
AK		 457 if ((vcpu->shadow_efer & EFER_LME)) {
458 int cs_db, cs_l;
459
460 if (!is_pae(vcpu)) {
461 printk(KERN_DEBUG "set_cr0: #GP, start paging "
462 "in long mode while PAE is disabled\n");
463 inject_gp(vcpu);
464 return;
465 }
466 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
467 if (cs_l) {
468 printk(KERN_DEBUG "set_cr0: #GP, start paging "
469 "in long mode while CS.L == 1\n");
470 inject_gp(vcpu);
471 return;
472
473 }
474 } else
475#endif
1342d353 476 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 477 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
478 "reserved bits\n");
479 inject_gp(vcpu);
480 return;
481 }
482
483 }
484
485 kvm_arch_ops->set_cr0(vcpu, cr0);
486 vcpu->cr0 = cr0;
487
488 spin_lock(&vcpu->kvm->lock);
489 kvm_mmu_reset_context(vcpu);
490 spin_unlock(&vcpu->kvm->lock);
491 return;
492}
493EXPORT_SYMBOL_GPL(set_cr0);
494
495void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
496{
399badf3 497 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 498 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
499}
500EXPORT_SYMBOL_GPL(lmsw);
501
502void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
503{
504 if (cr4 & CR4_RESEVED_BITS) {
505 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
506 inject_gp(vcpu);
507 return;
508 }
509
a9058ecd 510 if (is_long_mode(vcpu)) {
6aa8b732
AK		 511 if (!(cr4 & CR4_PAE_MASK)) {
512 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
513 "in long mode\n");
514 inject_gp(vcpu);
515 return;
516 }
517 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
1342d353 518 && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 519 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
520 inject_gp(vcpu);
521 }
522
523 if (cr4 & CR4_VMXE_MASK) {
524 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
525 inject_gp(vcpu);
526 return;
527 }
528 kvm_arch_ops->set_cr4(vcpu, cr4);
529 spin_lock(&vcpu->kvm->lock);
530 kvm_mmu_reset_context(vcpu);
531 spin_unlock(&vcpu->kvm->lock);
532}
533EXPORT_SYMBOL_GPL(set_cr4);
534
535void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
536{
a9058ecd 537 if (is_long_mode(vcpu)) {
d27d4aca 538 if (cr3 & CR3_L_MODE_RESEVED_BITS) {
6aa8b732
AK		 539 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
540 inject_gp(vcpu);
541 return;
542 }
543 } else {
544 if (cr3 & CR3_RESEVED_BITS) {
545 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
546 inject_gp(vcpu);
547 return;
548 }
549 if (is_paging(vcpu) && is_pae(vcpu) &&
1342d353 550 !load_pdptrs(vcpu, cr3)) {
6aa8b732
AK		 551 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
552 "reserved bits\n");
553 inject_gp(vcpu);
554 return;
555 }
556 }
557
558 vcpu->cr3 = cr3;
559 spin_lock(&vcpu->kvm->lock);
d21225ee
IM		 560 /*
561 * Does the new cr3 value map to physical memory? (Note, we
562 * catch an invalid cr3 even in real-mode, because it would
563 * cause trouble later on when we turn on paging anyway.)
564 *
565 * A real CPU would silently accept an invalid cr3 and would
566 * attempt to use it - with largely undefined (and often hard
567 * to debug) behavior on the guest side.
568 */
569 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
570 inject_gp(vcpu);
571 else
572 vcpu->mmu.new_cr3(vcpu);
6aa8b732
AK		 573 spin_unlock(&vcpu->kvm->lock);
574}
575EXPORT_SYMBOL_GPL(set_cr3);
576
577void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
578{
579 if ( cr8 & CR8_RESEVED_BITS) {
580 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
581 inject_gp(vcpu);
582 return;
583 }
584 vcpu->cr8 = cr8;
585}
586EXPORT_SYMBOL_GPL(set_cr8);
587
588void fx_init(struct kvm_vcpu *vcpu)
589{
590 struct __attribute__ ((__packed__)) fx_image_s {
591 u16 control; //fcw
592 u16 status; //fsw
593 u16 tag; // ftw
594 u16 opcode; //fop
595 u64 ip; // fpu ip
596 u64 operand;// fpu dp
597 u32 mxcsr;
598 u32 mxcsr_mask;
599
600 } *fx_image;
601
602 fx_save(vcpu->host_fx_image);
603 fpu_init();
604 fx_save(vcpu->guest_fx_image);
605 fx_restore(vcpu->host_fx_image);
606
607 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
608 fx_image->mxcsr = 0x1f80;
609 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
610 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
611}
612EXPORT_SYMBOL_GPL(fx_init);
613
6aa8b732
AK		 614/*
615 * Allocate some memory and give it an address in the guest physical address
616 * space.
617 *
618 * Discontiguous memory is allowed, mostly for framebuffers.
619 */
2c6f5df9
AK		 620static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
621 struct kvm_memory_region *mem)
6aa8b732
AK		 622{
623 int r;
624 gfn_t base_gfn;
625 unsigned long npages;
626 unsigned long i;
627 struct kvm_memory_slot *memslot;
628 struct kvm_memory_slot old, new;
629 int memory_config_version;
630
631 r = -EINVAL;
632 /* General sanity checks */
633 if (mem->memory_size & (PAGE_SIZE - 1))
634 goto out;
635 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
636 goto out;
637 if (mem->slot >= KVM_MEMORY_SLOTS)
638 goto out;
639 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
640 goto out;
641
642 memslot = &kvm->memslots[mem->slot];
643 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
644 npages = mem->memory_size >> PAGE_SHIFT;
645
646 if (!npages)
647 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
648
649raced:
650 spin_lock(&kvm->lock);
651
652 memory_config_version = kvm->memory_config_version;
653 new = old = *memslot;
654
655 new.base_gfn = base_gfn;
656 new.npages = npages;
657 new.flags = mem->flags;
658
659 /* Disallow changing a memory slot's size. */
660 r = -EINVAL;
661 if (npages && old.npages && npages != old.npages)
662 goto out_unlock;
663
664 /* Check for overlaps */
665 r = -EEXIST;
666 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
667 struct kvm_memory_slot *s = &kvm->memslots[i];
668
669 if (s == memslot)
670 continue;
671 if (!((base_gfn + npages <= s->base_gfn) ||
672 (base_gfn >= s->base_gfn + s->npages)))
673 goto out_unlock;
674 }
675 /*
676 * Do memory allocations outside lock. memory_config_version will
677 * detect any races.
678 */
679 spin_unlock(&kvm->lock);
680
681 /* Deallocate if slot is being removed */
682 if (!npages)
8b6d44c7 683 new.phys_mem = NULL;
6aa8b732
AK		 684
685 /* Free page dirty bitmap if unneeded */
686 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
8b6d44c7 687 new.dirty_bitmap = NULL;
6aa8b732
AK		 688
689 r = -ENOMEM;
690
691 /* Allocate if a slot is being created */
692 if (npages && !new.phys_mem) {
693 new.phys_mem = vmalloc(npages * sizeof(struct page *));
694
695 if (!new.phys_mem)
696 goto out_free;
697
698 memset(new.phys_mem, 0, npages * sizeof(struct page *));
699 for (i = 0; i < npages; ++i) {
700 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
701 | __GFP_ZERO);
702 if (!new.phys_mem[i])
703 goto out_free;
5972e953 704 set_page_private(new.phys_mem[i],0);
6aa8b732
AK		 705 }
706 }
707
708 /* Allocate page dirty bitmap if needed */
709 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
710 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
711
712 new.dirty_bitmap = vmalloc(dirty_bytes);
713 if (!new.dirty_bitmap)
714 goto out_free;
715 memset(new.dirty_bitmap, 0, dirty_bytes);
716 }
717
718 spin_lock(&kvm->lock);
719
720 if (memory_config_version != kvm->memory_config_version) {
721 spin_unlock(&kvm->lock);
722 kvm_free_physmem_slot(&new, &old);
723 goto raced;
724 }
725
726 r = -EAGAIN;
727 if (kvm->busy)
728 goto out_unlock;
729
730 if (mem->slot >= kvm->nmemslots)
731 kvm->nmemslots = mem->slot + 1;
732
733 *memslot = new;
734 ++kvm->memory_config_version;
735
736 spin_unlock(&kvm->lock);
737
738 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
739 struct kvm_vcpu *vcpu;
740
bccf2150 741 vcpu = vcpu_load_slot(kvm, i);
6aa8b732
AK		 742 if (!vcpu)
743 continue;
744 kvm_mmu_reset_context(vcpu);
745 vcpu_put(vcpu);
746 }
747
748 kvm_free_physmem_slot(&old, &new);
749 return 0;
750
751out_unlock:
752 spin_unlock(&kvm->lock);
753out_free:
754 kvm_free_physmem_slot(&new, &old);
755out:
756 return r;
757}
758
714b93da
AK		 759static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
760{
761 spin_lock(&vcpu->kvm->lock);
762 kvm_mmu_slot_remove_write_access(vcpu, slot);
763 spin_unlock(&vcpu->kvm->lock);
764}
765
6aa8b732
AK		 766/*
767 * Get (and clear) the dirty memory log for a memory slot.
768 */
2c6f5df9
AK		 769static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
770 struct kvm_dirty_log *log)
6aa8b732
AK		 771{
772 struct kvm_memory_slot *memslot;
773 int r, i;
774 int n;
714b93da 775 int cleared;
6aa8b732
AK		 776 unsigned long any = 0;
777
778 spin_lock(&kvm->lock);
779
780 /*
781 * Prevent changes to guest memory configuration even while the lock
782 * is not taken.
783 */
784 ++kvm->busy;
785 spin_unlock(&kvm->lock);
786 r = -EINVAL;
787 if (log->slot >= KVM_MEMORY_SLOTS)
788 goto out;
789
790 memslot = &kvm->memslots[log->slot];
791 r = -ENOENT;
792 if (!memslot->dirty_bitmap)
793 goto out;
794
795 n = ALIGN(memslot->npages, 8) / 8;
796
797 for (i = 0; !any && i < n; ++i)
798 any = memslot->dirty_bitmap[i];
799
800 r = -EFAULT;
801 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
802 goto out;
803
6aa8b732 804 if (any) {
714b93da 805 cleared = 0;
6aa8b732 806 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
bccf2150 807 struct kvm_vcpu *vcpu;
6aa8b732 808
bccf2150 809 vcpu = vcpu_load_slot(kvm, i);
6aa8b732
AK		 810 if (!vcpu)
811 continue;
714b93da
AK		 812 if (!cleared) {
813 do_remove_write_access(vcpu, log->slot);
814 memset(memslot->dirty_bitmap, 0, n);
815 cleared = 1;
816 }
6aa8b732
AK		 817 kvm_arch_ops->tlb_flush(vcpu);
818 vcpu_put(vcpu);
819 }
820 }
821
822 r = 0;
823
824out:
825 spin_lock(&kvm->lock);
826 --kvm->busy;
827 spin_unlock(&kvm->lock);
828 return r;
829}
830
831struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
832{
833 int i;
834
835 for (i = 0; i < kvm->nmemslots; ++i) {
836 struct kvm_memory_slot *memslot = &kvm->memslots[i];
837
838 if (gfn >= memslot->base_gfn
839 && gfn < memslot->base_gfn + memslot->npages)
840 return memslot;
841 }
8b6d44c7 842 return NULL;
6aa8b732
AK		 843}
844EXPORT_SYMBOL_GPL(gfn_to_memslot);
845
846void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
847{
848 int i;
8b6d44c7 849 struct kvm_memory_slot *memslot = NULL;
6aa8b732
AK		 850 unsigned long rel_gfn;
851
852 for (i = 0; i < kvm->nmemslots; ++i) {
853 memslot = &kvm->memslots[i];
854
855 if (gfn >= memslot->base_gfn
856 && gfn < memslot->base_gfn + memslot->npages) {
857
858 if (!memslot || !memslot->dirty_bitmap)
859 return;
860
861 rel_gfn = gfn - memslot->base_gfn;
862
863 /* avoid RMW */
864 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
865 set_bit(rel_gfn, memslot->dirty_bitmap);
866 return;
867 }
868 }
869}
870
871static int emulator_read_std(unsigned long addr,
872 unsigned long *val,
873 unsigned int bytes,
874 struct x86_emulate_ctxt *ctxt)
875{
876 struct kvm_vcpu *vcpu = ctxt->vcpu;
877 void *data = val;
878
879 while (bytes) {
880 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
881 unsigned offset = addr & (PAGE_SIZE-1);
882 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
883 unsigned long pfn;
884 struct kvm_memory_slot *memslot;
885 void *page;
886
887 if (gpa == UNMAPPED_GVA)
888 return X86EMUL_PROPAGATE_FAULT;
889 pfn = gpa >> PAGE_SHIFT;
890 memslot = gfn_to_memslot(vcpu->kvm, pfn);
891 if (!memslot)
892 return X86EMUL_UNHANDLEABLE;
893 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
894
895 memcpy(data, page + offset, tocopy);
896
897 kunmap_atomic(page, KM_USER0);
898
899 bytes -= tocopy;
900 data += tocopy;
901 addr += tocopy;
902 }
903
904 return X86EMUL_CONTINUE;
905}
906
907static int emulator_write_std(unsigned long addr,
908 unsigned long val,
909 unsigned int bytes,
910 struct x86_emulate_ctxt *ctxt)
911{
912 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
913 addr, bytes);
914 return X86EMUL_UNHANDLEABLE;
915}
916
917static int emulator_read_emulated(unsigned long addr,
918 unsigned long *val,
919 unsigned int bytes,
920 struct x86_emulate_ctxt *ctxt)
921{
922 struct kvm_vcpu *vcpu = ctxt->vcpu;
923
924 if (vcpu->mmio_read_completed) {
925 memcpy(val, vcpu->mmio_data, bytes);
926 vcpu->mmio_read_completed = 0;
927 return X86EMUL_CONTINUE;
928 } else if (emulator_read_std(addr, val, bytes, ctxt)
929 == X86EMUL_CONTINUE)
930 return X86EMUL_CONTINUE;
931 else {
932 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
d27d4aca 933
6aa8b732 934 if (gpa == UNMAPPED_GVA)
d27d4aca 935 return X86EMUL_PROPAGATE_FAULT;
6aa8b732
AK		 936 vcpu->mmio_needed = 1;
937 vcpu->mmio_phys_addr = gpa;
938 vcpu->mmio_size = bytes;
939 vcpu->mmio_is_write = 0;
940
941 return X86EMUL_UNHANDLEABLE;
942 }
943}
944
da4a00f0
AK		 945static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
946 unsigned long val, int bytes)
947{
948 struct kvm_memory_slot *m;
949 struct page *page;
950 void *virt;
951
952 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
953 return 0;
954 m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
955 if (!m)
956 return 0;
957 page = gfn_to_page(m, gpa >> PAGE_SHIFT);
958 kvm_mmu_pre_write(vcpu, gpa, bytes);
ab51a434 959 mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
da4a00f0
AK		 960 virt = kmap_atomic(page, KM_USER0);
961 memcpy(virt + offset_in_page(gpa), &val, bytes);
962 kunmap_atomic(virt, KM_USER0);
963 kvm_mmu_post_write(vcpu, gpa, bytes);
964 return 1;
965}
966
6aa8b732
AK		 967static int emulator_write_emulated(unsigned long addr,
968 unsigned long val,
969 unsigned int bytes,
970 struct x86_emulate_ctxt *ctxt)
971{
972 struct kvm_vcpu *vcpu = ctxt->vcpu;
973 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
974
975 if (gpa == UNMAPPED_GVA)
976 return X86EMUL_PROPAGATE_FAULT;
977
da4a00f0
AK		 978 if (emulator_write_phys(vcpu, gpa, val, bytes))
979 return X86EMUL_CONTINUE;
980
6aa8b732
AK		 981 vcpu->mmio_needed = 1;
982 vcpu->mmio_phys_addr = gpa;
983 vcpu->mmio_size = bytes;
984 vcpu->mmio_is_write = 1;
985 memcpy(vcpu->mmio_data, &val, bytes);
986
987 return X86EMUL_CONTINUE;
988}
989
990static int emulator_cmpxchg_emulated(unsigned long addr,
991 unsigned long old,
992 unsigned long new,
993 unsigned int bytes,
994 struct x86_emulate_ctxt *ctxt)
995{
996 static int reported;
997
998 if (!reported) {
999 reported = 1;
1000 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1001 }
1002 return emulator_write_emulated(addr, new, bytes, ctxt);
1003}
1004
32b35627
AK		 1005#ifdef CONFIG_X86_32
1006
1007static int emulator_cmpxchg8b_emulated(unsigned long addr,
1008 unsigned long old_lo,
1009 unsigned long old_hi,
1010 unsigned long new_lo,
1011 unsigned long new_hi,
1012 struct x86_emulate_ctxt *ctxt)
1013{
1014 static int reported;
1015 int r;
1016
1017 if (!reported) {
1018 reported = 1;
1019 printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
1020 }
1021 r = emulator_write_emulated(addr, new_lo, 4, ctxt);
1022 if (r != X86EMUL_CONTINUE)
1023 return r;
1024 return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
1025}
1026
1027#endif
1028
6aa8b732
AK		 1029static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1030{
1031 return kvm_arch_ops->get_segment_base(vcpu, seg);
1032}
1033
1034int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1035{
6aa8b732
AK		 1036 return X86EMUL_CONTINUE;
1037}
1038
1039int emulate_clts(struct kvm_vcpu *vcpu)
1040{
399badf3 1041 unsigned long cr0;
6aa8b732 1042
399badf3
AK		 1043 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1044 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
6aa8b732
AK		 1045 kvm_arch_ops->set_cr0(vcpu, cr0);
1046 return X86EMUL_CONTINUE;
1047}
1048
1049int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1050{
1051 struct kvm_vcpu *vcpu = ctxt->vcpu;
1052
1053 switch (dr) {
1054 case 0 ... 3:
1055 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1056 return X86EMUL_CONTINUE;
1057 default:
1058 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1059 __FUNCTION__, dr);
1060 return X86EMUL_UNHANDLEABLE;
1061 }
1062}
1063
1064int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1065{
1066 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1067 int exception;
1068
1069 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1070 if (exception) {
1071 /* FIXME: better handling */
1072 return X86EMUL_UNHANDLEABLE;
1073 }
1074 return X86EMUL_CONTINUE;
1075}
1076
1077static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1078{
1079 static int reported;
1080 u8 opcodes[4];
1081 unsigned long rip = ctxt->vcpu->rip;
1082 unsigned long rip_linear;
1083
1084 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1085
1086 if (reported)
1087 return;
1088
1089 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1090
1091 printk(KERN_ERR "emulation failed but !mmio_needed?"
1092 " rip %lx %02x %02x %02x %02x\n",
1093 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1094 reported = 1;
1095}
1096
1097struct x86_emulate_ops emulate_ops = {
1098 .read_std = emulator_read_std,
1099 .write_std = emulator_write_std,
1100 .read_emulated = emulator_read_emulated,
1101 .write_emulated = emulator_write_emulated,
1102 .cmpxchg_emulated = emulator_cmpxchg_emulated,
32b35627
AK		 1103#ifdef CONFIG_X86_32
1104 .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated,
1105#endif
6aa8b732
AK		 1106};
1107
1108int emulate_instruction(struct kvm_vcpu *vcpu,
1109 struct kvm_run *run,
1110 unsigned long cr2,
1111 u16 error_code)
1112{
1113 struct x86_emulate_ctxt emulate_ctxt;
1114 int r;
1115 int cs_db, cs_l;
1116
1117 kvm_arch_ops->cache_regs(vcpu);
1118
1119 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1120
1121 emulate_ctxt.vcpu = vcpu;
1122 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1123 emulate_ctxt.cr2 = cr2;
1124 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1125 ? X86EMUL_MODE_REAL : cs_l
1126 ? X86EMUL_MODE_PROT64 : cs_db
1127 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1128
1129 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1130 emulate_ctxt.cs_base = 0;
1131 emulate_ctxt.ds_base = 0;
1132 emulate_ctxt.es_base = 0;
1133 emulate_ctxt.ss_base = 0;
1134 } else {
1135 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1136 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1137 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1138 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1139 }
1140
1141 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1142 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1143
1144 vcpu->mmio_is_write = 0;
1145 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1146
1147 if ((r || vcpu->mmio_is_write) && run) {
1148 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1149 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1150 run->mmio.len = vcpu->mmio_size;
1151 run->mmio.is_write = vcpu->mmio_is_write;
1152 }
1153
1154 if (r) {
a436036b
AK		 1155 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1156 return EMULATE_DONE;
6aa8b732
AK		 1157 if (!vcpu->mmio_needed) {
1158 report_emulation_failure(&emulate_ctxt);
1159 return EMULATE_FAIL;
1160 }
1161 return EMULATE_DO_MMIO;
1162 }
1163
1164 kvm_arch_ops->decache_regs(vcpu);
1165 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1166
1167 if (vcpu->mmio_is_write)
1168 return EMULATE_DO_MMIO;
1169
1170 return EMULATE_DONE;
1171}
1172EXPORT_SYMBOL_GPL(emulate_instruction);
1173
270fd9b9
AK		 1174int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1175{
1176 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1177
1178 kvm_arch_ops->decache_regs(vcpu);
1179 ret = -KVM_EINVAL;
1180#ifdef CONFIG_X86_64
1181 if (is_long_mode(vcpu)) {
1182 nr = vcpu->regs[VCPU_REGS_RAX];
1183 a0 = vcpu->regs[VCPU_REGS_RDI];
1184 a1 = vcpu->regs[VCPU_REGS_RSI];
1185 a2 = vcpu->regs[VCPU_REGS_RDX];
1186 a3 = vcpu->regs[VCPU_REGS_RCX];
1187 a4 = vcpu->regs[VCPU_REGS_R8];
1188 a5 = vcpu->regs[VCPU_REGS_R9];
1189 } else
1190#endif
1191 {
1192 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1193 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1194 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1195 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1196 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1197 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1198 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1199 }
1200 switch (nr) {
1201 default:
1202 ;
1203 }
1204 vcpu->regs[VCPU_REGS_RAX] = ret;
1205 kvm_arch_ops->cache_regs(vcpu);
1206 return 1;
1207}
1208EXPORT_SYMBOL_GPL(kvm_hypercall);
1209
6aa8b732
AK		 1210static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1211{
1212 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1213}
1214
1215void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1216{
1217 struct descriptor_table dt = { limit, base };
1218
1219 kvm_arch_ops->set_gdt(vcpu, &dt);
1220}
1221
1222void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1223{
1224 struct descriptor_table dt = { limit, base };
1225
1226 kvm_arch_ops->set_idt(vcpu, &dt);
1227}
1228
1229void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1230 unsigned long *rflags)
1231{
1232 lmsw(vcpu, msw);
1233 *rflags = kvm_arch_ops->get_rflags(vcpu);
1234}
1235
1236unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1237{
399badf3 1238 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1239 switch (cr) {
1240 case 0:
1241 return vcpu->cr0;
1242 case 2:
1243 return vcpu->cr2;
1244 case 3:
1245 return vcpu->cr3;
1246 case 4:
1247 return vcpu->cr4;
1248 default:
1249 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1250 return 0;
1251 }
1252}
1253
1254void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1255 unsigned long *rflags)
1256{
1257 switch (cr) {
1258 case 0:
1259 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1260 *rflags = kvm_arch_ops->get_rflags(vcpu);
1261 break;
1262 case 2:
1263 vcpu->cr2 = val;
1264 break;
1265 case 3:
1266 set_cr3(vcpu, val);
1267 break;
1268 case 4:
1269 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1270 break;
1271 default:
1272 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1273 }
1274}
1275
102d8325
IM		 1276/*
1277 * Register the para guest with the host:
1278 */
1279static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1280{
1281 struct kvm_vcpu_para_state *para_state;
1282 hpa_t para_state_hpa, hypercall_hpa;
1283 struct page *para_state_page;
1284 unsigned char *hypercall;
1285 gpa_t hypercall_gpa;
1286
1287 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1288 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1289
1290 /*
1291 * Needs to be page aligned:
1292 */
1293 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1294 goto err_gp;
1295
1296 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1297 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1298 if (is_error_hpa(para_state_hpa))
1299 goto err_gp;
1300
ab51a434 1301 mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
102d8325
IM		 1302 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1303 para_state = kmap_atomic(para_state_page, KM_USER0);
1304
1305 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1306 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1307
1308 para_state->host_version = KVM_PARA_API_VERSION;
1309 /*
1310 * We cannot support guests that try to register themselves
1311 * with a newer API version than the host supports:
1312 */
1313 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1314 para_state->ret = -KVM_EINVAL;
1315 goto err_kunmap_skip;
1316 }
1317
1318 hypercall_gpa = para_state->hypercall_gpa;
1319 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1320 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1321 if (is_error_hpa(hypercall_hpa)) {
1322 para_state->ret = -KVM_EINVAL;
1323 goto err_kunmap_skip;
1324 }
1325
1326 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1327 vcpu->para_state_page = para_state_page;
1328 vcpu->para_state_gpa = para_state_gpa;
1329 vcpu->hypercall_gpa = hypercall_gpa;
1330
ab51a434 1331 mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
102d8325
IM		 1332 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1333 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1334 kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1335 kunmap_atomic(hypercall, KM_USER1);
1336
1337 para_state->ret = 0;
1338err_kunmap_skip:
1339 kunmap_atomic(para_state, KM_USER0);
1340 return 0;
1341err_gp:
1342 return 1;
1343}
1344
3bab1f5d
AK		 1345int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1346{
1347 u64 data;
1348
1349 switch (msr) {
1350 case 0xc0010010: /* SYSCFG */
1351 case 0xc0010015: /* HWCR */
1352 case MSR_IA32_PLATFORM_ID:
1353 case MSR_IA32_P5_MC_ADDR:
1354 case MSR_IA32_P5_MC_TYPE:
1355 case MSR_IA32_MC0_CTL:
1356 case MSR_IA32_MCG_STATUS:
1357 case MSR_IA32_MCG_CAP:
1358 case MSR_IA32_MC0_MISC:
1359 case MSR_IA32_MC0_MISC+4:
1360 case MSR_IA32_MC0_MISC+8:
1361 case MSR_IA32_MC0_MISC+12:
1362 case MSR_IA32_MC0_MISC+16:
1363 case MSR_IA32_UCODE_REV:
a8d13ea2 1364 case MSR_IA32_PERF_STATUS:
3bab1f5d
AK		 1365 /* MTRR registers */
1366 case 0xfe:
1367 case 0x200 ... 0x2ff:
1368 data = 0;
1369 break;
a8d13ea2
AK		 1370 case 0xcd: /* fsb frequency */
1371 data = 3;
1372 break;
3bab1f5d
AK		 1373 case MSR_IA32_APICBASE:
1374 data = vcpu->apic_base;
1375 break;
6f00e68f
AK		 1376 case MSR_IA32_MISC_ENABLE:
1377 data = vcpu->ia32_misc_enable_msr;
1378 break;
3bab1f5d
AK		 1379#ifdef CONFIG_X86_64
1380 case MSR_EFER:
1381 data = vcpu->shadow_efer;
1382 break;
1383#endif
1384 default:
1385 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1386 return 1;
1387 }
1388 *pdata = data;
1389 return 0;
1390}
1391EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1392
6aa8b732
AK		 1393/*
1394 * Reads an msr value (of 'msr_index') into 'pdata'.
1395 * Returns 0 on success, non-0 otherwise.
1396 * Assumes vcpu_load() was already called.
1397 */
1398static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1399{
1400 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1401}
1402
05b3e0c2 1403#ifdef CONFIG_X86_64
6aa8b732 1404
3bab1f5d 1405static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1406{
6aa8b732
AK		 1407 if (efer & EFER_RESERVED_BITS) {
1408 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1409 efer);
1410 inject_gp(vcpu);
1411 return;
1412 }
1413
1414 if (is_paging(vcpu)
1415 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1416 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1417 inject_gp(vcpu);
1418 return;
1419 }
1420
7725f0ba
AK		 1421 kvm_arch_ops->set_efer(vcpu, efer);
1422
6aa8b732
AK		 1423 efer &= ~EFER_LMA;
1424 efer |= vcpu->shadow_efer & EFER_LMA;
1425
1426 vcpu->shadow_efer = efer;
6aa8b732 1427}
6aa8b732
AK		 1428
1429#endif
1430
3bab1f5d
AK		 1431int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1432{
1433 switch (msr) {
1434#ifdef CONFIG_X86_64
1435 case MSR_EFER:
1436 set_efer(vcpu, data);
1437 break;
1438#endif
1439 case MSR_IA32_MC0_STATUS:
1440 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1441 __FUNCTION__, data);
1442 break;
1443 case MSR_IA32_UCODE_REV:
1444 case MSR_IA32_UCODE_WRITE:
1445 case 0x200 ... 0x2ff: /* MTRRs */
1446 break;
1447 case MSR_IA32_APICBASE:
1448 vcpu->apic_base = data;
1449 break;
6f00e68f
AK		 1450 case MSR_IA32_MISC_ENABLE:
1451 vcpu->ia32_misc_enable_msr = data;
1452 break;
102d8325
IM		 1453 /*
1454 * This is the 'probe whether the host is KVM' logic:
1455 */
1456 case MSR_KVM_API_MAGIC:
1457 return vcpu_register_para(vcpu, data);
1458
3bab1f5d
AK		 1459 default:
1460 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1461 return 1;
1462 }
1463 return 0;
1464}
1465EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1466
6aa8b732
AK		 1467/*
1468 * Writes msr value into into the appropriate "register".
1469 * Returns 0 on success, non-0 otherwise.
1470 * Assumes vcpu_load() was already called.
1471 */
1472static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1473{
1474 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1475}
1476
1477void kvm_resched(struct kvm_vcpu *vcpu)
1478{
1479 vcpu_put(vcpu);
1480 cond_resched();
bccf2150 1481 vcpu_load(vcpu);
6aa8b732
AK		 1482}
1483EXPORT_SYMBOL_GPL(kvm_resched);
1484
1485void load_msrs(struct vmx_msr_entry *e, int n)
1486{
1487 int i;
1488
1489 for (i = 0; i < n; ++i)
1490 wrmsrl(e[i].index, e[i].data);
1491}
1492EXPORT_SYMBOL_GPL(load_msrs);
1493
1494void save_msrs(struct vmx_msr_entry *e, int n)
1495{
1496 int i;
1497
1498 for (i = 0; i < n; ++i)
1499 rdmsrl(e[i].index, e[i].data);
1500}
1501EXPORT_SYMBOL_GPL(save_msrs);
1502
bccf2150 1503static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
6aa8b732 1504{
6aa8b732
AK		 1505 int r;
1506
bccf2150 1507 vcpu_load(vcpu);
6aa8b732 1508
54810342
DL		 1509 /* re-sync apic's tpr */
1510 vcpu->cr8 = kvm_run->cr8;
1511
6aa8b732
AK		 1512 if (kvm_run->emulated) {
1513 kvm_arch_ops->skip_emulated_instruction(vcpu);
1514 kvm_run->emulated = 0;
1515 }
1516
1517 if (kvm_run->mmio_completed) {
1518 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1519 vcpu->mmio_read_completed = 1;
1520 }
1521
1522 vcpu->mmio_needed = 0;
1523
1524 r = kvm_arch_ops->run(vcpu, kvm_run);
1525
1526 vcpu_put(vcpu);
1527 return r;
1528}
1529
bccf2150
AK		 1530static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
1531 struct kvm_regs *regs)
6aa8b732 1532{
bccf2150 1533 vcpu_load(vcpu);
6aa8b732
AK		 1534
1535 kvm_arch_ops->cache_regs(vcpu);
1536
1537 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1538 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1539 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1540 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1541 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1542 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1543 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1544 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1545#ifdef CONFIG_X86_64
6aa8b732
AK		 1546 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1547 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1548 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1549 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1550 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1551 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1552 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1553 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1554#endif
1555
1556 regs->rip = vcpu->rip;
1557 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1558
1559 /*
1560 * Don't leak debug flags in case they were set for guest debugging
1561 */
1562 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1563 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1564
1565 vcpu_put(vcpu);
1566
1567 return 0;
1568}
1569
bccf2150
AK		 1570static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
1571 struct kvm_regs *regs)
6aa8b732 1572{
bccf2150 1573 vcpu_load(vcpu);
6aa8b732
AK		 1574
1575 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1576 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1577 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1578 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1579 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1580 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1581 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1582 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1583#ifdef CONFIG_X86_64
6aa8b732
AK		 1584 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1585 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1586 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1587 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1588 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1589 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1590 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1591 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1592#endif
1593
1594 vcpu->rip = regs->rip;
1595 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1596
1597 kvm_arch_ops->decache_regs(vcpu);
1598
1599 vcpu_put(vcpu);
1600
1601 return 0;
1602}
1603
1604static void get_segment(struct kvm_vcpu *vcpu,
1605 struct kvm_segment *var, int seg)
1606{
1607 return kvm_arch_ops->get_segment(vcpu, var, seg);
1608}
1609
bccf2150
AK		 1610static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1611 struct kvm_sregs *sregs)
6aa8b732 1612{
6aa8b732
AK		 1613 struct descriptor_table dt;
1614
bccf2150 1615 vcpu_load(vcpu);
6aa8b732
AK		 1616
1617 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1618 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1619 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1620 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1621 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1622 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1623
1624 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1625 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1626
1627 kvm_arch_ops->get_idt(vcpu, &dt);
1628 sregs->idt.limit = dt.limit;
1629 sregs->idt.base = dt.base;
1630 kvm_arch_ops->get_gdt(vcpu, &dt);
1631 sregs->gdt.limit = dt.limit;
1632 sregs->gdt.base = dt.base;
1633
399badf3 1634 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1635 sregs->cr0 = vcpu->cr0;
1636 sregs->cr2 = vcpu->cr2;
1637 sregs->cr3 = vcpu->cr3;
1638 sregs->cr4 = vcpu->cr4;
1639 sregs->cr8 = vcpu->cr8;
1640 sregs->efer = vcpu->shadow_efer;
1641 sregs->apic_base = vcpu->apic_base;
1642
1643 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1644 sizeof sregs->interrupt_bitmap);
1645
1646 vcpu_put(vcpu);
1647
1648 return 0;
1649}
1650
1651static void set_segment(struct kvm_vcpu *vcpu,
1652 struct kvm_segment *var, int seg)
1653{
1654 return kvm_arch_ops->set_segment(vcpu, var, seg);
1655}
1656
bccf2150
AK		 1657static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
1658 struct kvm_sregs *sregs)
6aa8b732 1659{
6aa8b732
AK		 1660 int mmu_reset_needed = 0;
1661 int i;
1662 struct descriptor_table dt;
1663
bccf2150 1664 vcpu_load(vcpu);
6aa8b732
AK		 1665
1666 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1667 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1668 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1669 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1670 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1671 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1672
1673 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1674 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1675
1676 dt.limit = sregs->idt.limit;
1677 dt.base = sregs->idt.base;
1678 kvm_arch_ops->set_idt(vcpu, &dt);
1679 dt.limit = sregs->gdt.limit;
1680 dt.base = sregs->gdt.base;
1681 kvm_arch_ops->set_gdt(vcpu, &dt);
1682
1683 vcpu->cr2 = sregs->cr2;
1684 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1685 vcpu->cr3 = sregs->cr3;
1686
1687 vcpu->cr8 = sregs->cr8;
1688
1689 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 1690#ifdef CONFIG_X86_64
6aa8b732
AK		 1691 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1692#endif
1693 vcpu->apic_base = sregs->apic_base;
1694
399badf3
AK		 1695 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1696
6aa8b732
AK		 1697 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1698 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1699
1700 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1701 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 1702 if (!is_long_mode(vcpu) && is_pae(vcpu))
1703 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 1704
1705 if (mmu_reset_needed)
1706 kvm_mmu_reset_context(vcpu);
1707
1708 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1709 sizeof vcpu->irq_pending);
1710 vcpu->irq_summary = 0;
1711 for (i = 0; i < NR_IRQ_WORDS; ++i)
1712 if (vcpu->irq_pending[i])
1713 __set_bit(i, &vcpu->irq_summary);
1714
1715 vcpu_put(vcpu);
1716
1717 return 0;
1718}
1719
1720/*
1721 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1722 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 1723 *
1724 * This list is modified at module load time to reflect the
1725 * capabilities of the host cpu.
6aa8b732
AK		 1726 */
1727static u32 msrs_to_save[] = {
1728 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1729 MSR_K6_STAR,
05b3e0c2 1730#ifdef CONFIG_X86_64
6aa8b732
AK		 1731 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1732#endif
1733 MSR_IA32_TIME_STAMP_COUNTER,
1734};
1735
bf591b24
MR		 1736static unsigned num_msrs_to_save;
1737
6f00e68f
AK		 1738static u32 emulated_msrs[] = {
1739 MSR_IA32_MISC_ENABLE,
1740};
1741
bf591b24
MR		 1742static __init void kvm_init_msr_list(void)
1743{
1744 u32 dummy[2];
1745 unsigned i, j;
1746
1747 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1748 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1749 continue;
1750 if (j < i)
1751 msrs_to_save[j] = msrs_to_save[i];
1752 j++;
1753 }
1754 num_msrs_to_save = j;
1755}
6aa8b732
AK		 1756
1757/*
1758 * Adapt set_msr() to msr_io()'s calling convention
1759 */
1760static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1761{
1762 return set_msr(vcpu, index, *data);
1763}
1764
1765/*
1766 * Read or write a bunch of msrs. All parameters are kernel addresses.
1767 *
1768 * @return number of msrs set successfully.
1769 */
bccf2150 1770static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
6aa8b732
AK		 1771 struct kvm_msr_entry *entries,
1772 int (*do_msr)(struct kvm_vcpu *vcpu,
1773 unsigned index, u64 *data))
1774{
6aa8b732
AK		 1775 int i;
1776
bccf2150 1777 vcpu_load(vcpu);
6aa8b732
AK		 1778
1779 for (i = 0; i < msrs->nmsrs; ++i)
1780 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1781 break;
1782
1783 vcpu_put(vcpu);
1784
1785 return i;
1786}
1787
1788/*
1789 * Read or write a bunch of msrs. Parameters are user addresses.
1790 *
1791 * @return number of msrs set successfully.
1792 */
bccf2150 1793static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
6aa8b732
AK		 1794 int (*do_msr)(struct kvm_vcpu *vcpu,
1795 unsigned index, u64 *data),
1796 int writeback)
1797{
1798 struct kvm_msrs msrs;
1799 struct kvm_msr_entry *entries;
1800 int r, n;
1801 unsigned size;
1802
1803 r = -EFAULT;
1804 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1805 goto out;
1806
1807 r = -E2BIG;
1808 if (msrs.nmsrs >= MAX_IO_MSRS)
1809 goto out;
1810
1811 r = -ENOMEM;
1812 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1813 entries = vmalloc(size);
1814 if (!entries)
1815 goto out;
1816
1817 r = -EFAULT;
1818 if (copy_from_user(entries, user_msrs->entries, size))
1819 goto out_free;
1820
bccf2150 1821 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
6aa8b732
AK		 1822 if (r < 0)
1823 goto out_free;
1824
1825 r = -EFAULT;
1826 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1827 goto out_free;
1828
1829 r = n;
1830
1831out_free:
1832 vfree(entries);
1833out:
1834 return r;
1835}
1836
1837/*
1838 * Translate a guest virtual address to a guest physical address.
1839 */
bccf2150
AK		 1840static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
1841 struct kvm_translation *tr)
6aa8b732
AK		 1842{
1843 unsigned long vaddr = tr->linear_address;
6aa8b732
AK		 1844 gpa_t gpa;
1845
bccf2150
AK		 1846 vcpu_load(vcpu);
1847 spin_lock(&vcpu->kvm->lock);
6aa8b732
AK		 1848 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1849 tr->physical_address = gpa;
1850 tr->valid = gpa != UNMAPPED_GVA;
1851 tr->writeable = 1;
1852 tr->usermode = 0;
bccf2150 1853 spin_unlock(&vcpu->kvm->lock);
6aa8b732
AK		 1854 vcpu_put(vcpu);
1855
1856 return 0;
1857}
1858
bccf2150
AK		 1859static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
1860 struct kvm_interrupt *irq)
6aa8b732 1861{
6aa8b732
AK		 1862 if (irq->irq < 0 || irq->irq >= 256)
1863 return -EINVAL;
bccf2150 1864 vcpu_load(vcpu);
6aa8b732
AK		 1865
1866 set_bit(irq->irq, vcpu->irq_pending);
1867 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1868
1869 vcpu_put(vcpu);
1870
1871 return 0;
1872}
1873
bccf2150
AK		 1874static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
1875 struct kvm_debug_guest *dbg)
6aa8b732 1876{
6aa8b732
AK		 1877 int r;
1878
bccf2150 1879 vcpu_load(vcpu);
6aa8b732
AK		 1880
1881 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1882
1883 vcpu_put(vcpu);
1884
1885 return r;
1886}
1887
bccf2150
AK		 1888static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1889{
1890 struct kvm_vcpu *vcpu = filp->private_data;
1891
1892 fput(vcpu->kvm->filp);
1893 return 0;
1894}
1895
1896static struct file_operations kvm_vcpu_fops = {
1897 .release = kvm_vcpu_release,
1898 .unlocked_ioctl = kvm_vcpu_ioctl,
1899 .compat_ioctl = kvm_vcpu_ioctl,
1900};
1901
1902/*
1903 * Allocates an inode for the vcpu.
1904 */
1905static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1906{
1907 int fd, r;
1908 struct inode *inode;
1909 struct file *file;
1910
1911 atomic_inc(&vcpu->kvm->filp->f_count);
1912 inode = kvmfs_inode(&kvm_vcpu_fops);
1913 if (IS_ERR(inode)) {
1914 r = PTR_ERR(inode);
1915 goto out1;
1916 }
1917
1918 file = kvmfs_file(inode, vcpu);
1919 if (IS_ERR(file)) {
1920 r = PTR_ERR(file);
1921 goto out2;
1922 }
1923
1924 r = get_unused_fd();
1925 if (r < 0)
1926 goto out3;
1927 fd = r;
1928 fd_install(fd, file);
1929
1930 return fd;
1931
1932out3:
1933 fput(file);
1934out2:
1935 iput(inode);
1936out1:
1937 fput(vcpu->kvm->filp);
1938 return r;
1939}
1940
c5ea7660
AK		 1941/*
1942 * Creates some virtual cpus. Good luck creating more than one.
1943 */
1944static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
1945{
1946 int r;
1947 struct kvm_vcpu *vcpu;
1948
1949 r = -EINVAL;
1950 if (!valid_vcpu(n))
1951 goto out;
1952
1953 vcpu = &kvm->vcpus[n];
1954
1955 mutex_lock(&vcpu->mutex);
1956
1957 if (vcpu->vmcs) {
1958 mutex_unlock(&vcpu->mutex);
1959 return -EEXIST;
1960 }
1961
1962 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
1963 FX_IMAGE_ALIGN);
1964 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
1965
1966 r = kvm_arch_ops->vcpu_create(vcpu);
1967 if (r < 0)
1968 goto out_free_vcpus;
1969
1970 r = kvm_mmu_create(vcpu);
1971 if (r < 0)
1972 goto out_free_vcpus;
1973
1974 kvm_arch_ops->vcpu_load(vcpu);
1975 r = kvm_mmu_setup(vcpu);
1976 if (r >= 0)
1977 r = kvm_arch_ops->vcpu_setup(vcpu);
1978 vcpu_put(vcpu);
1979
1980 if (r < 0)
1981 goto out_free_vcpus;
1982
bccf2150
AK		 1983 r = create_vcpu_fd(vcpu);
1984 if (r < 0)
1985 goto out_free_vcpus;
1986
1987 return r;
c5ea7660
AK		 1988
1989out_free_vcpus:
1990 kvm_free_vcpu(vcpu);
1991 mutex_unlock(&vcpu->mutex);
1992out:
1993 return r;
1994}
1995
bccf2150
AK		 1996static long kvm_vcpu_ioctl(struct file *filp,
1997 unsigned int ioctl, unsigned long arg)
6aa8b732 1998{
bccf2150 1999 struct kvm_vcpu *vcpu = filp->private_data;
2f366987 2000 void __user *argp = (void __user *)arg;
6aa8b732
AK		 2001 int r = -EINVAL;
2002
2003 switch (ioctl) {
6aa8b732
AK		 2004 case KVM_RUN: {
2005 struct kvm_run kvm_run;
2006
2007 r = -EFAULT;
2f366987 2008 if (copy_from_user(&kvm_run, argp, sizeof kvm_run))
6aa8b732 2009 goto out;
bccf2150 2010 r = kvm_vcpu_ioctl_run(vcpu, &kvm_run);
c1150d8c 2011 if (r < 0 && r != -EINTR)
6aa8b732 2012 goto out;
2f366987 2013 if (copy_to_user(argp, &kvm_run, sizeof kvm_run)) {
c1150d8c 2014 r = -EFAULT;
6aa8b732 2015 goto out;
c1150d8c 2016 }
6aa8b732
AK		 2017 break;
2018 }
2019 case KVM_GET_REGS: {
2020 struct kvm_regs kvm_regs;
2021
bccf2150
AK		 2022 memset(&kvm_regs, 0, sizeof kvm_regs);
2023 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2024 if (r)
2025 goto out;
2026 r = -EFAULT;
2f366987 2027 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 2028 goto out;
2029 r = 0;
2030 break;
2031 }
2032 case KVM_SET_REGS: {
2033 struct kvm_regs kvm_regs;
2034
2035 r = -EFAULT;
2f366987 2036 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732 2037 goto out;
bccf2150 2038 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2039 if (r)
2040 goto out;
2041 r = 0;
2042 break;
2043 }
2044 case KVM_GET_SREGS: {
2045 struct kvm_sregs kvm_sregs;
2046
bccf2150
AK		 2047 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2048 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2049 if (r)
2050 goto out;
2051 r = -EFAULT;
2f366987 2052 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 2053 goto out;
2054 r = 0;
2055 break;
2056 }
2057 case KVM_SET_SREGS: {
2058 struct kvm_sregs kvm_sregs;
2059
2060 r = -EFAULT;
2f366987 2061 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732 2062 goto out;
bccf2150 2063 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2064 if (r)
2065 goto out;
2066 r = 0;
2067 break;
2068 }
2069 case KVM_TRANSLATE: {
2070 struct kvm_translation tr;
2071
2072 r = -EFAULT;
2f366987 2073 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732 2074 goto out;
bccf2150 2075 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
6aa8b732
AK		 2076 if (r)
2077 goto out;
2078 r = -EFAULT;
2f366987 2079 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 2080 goto out;
2081 r = 0;
2082 break;
2083 }
2084 case KVM_INTERRUPT: {
2085 struct kvm_interrupt irq;
2086
2087 r = -EFAULT;
2f366987 2088 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732 2089 goto out;
bccf2150 2090 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
6aa8b732
AK		 2091 if (r)
2092 goto out;
2093 r = 0;
2094 break;
2095 }
2096 case KVM_DEBUG_GUEST: {
2097 struct kvm_debug_guest dbg;
2098
2099 r = -EFAULT;
2f366987 2100 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732 2101 goto out;
bccf2150 2102 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
6aa8b732
AK		 2103 if (r)
2104 goto out;
2105 r = 0;
2106 break;
2107 }
bccf2150
AK		 2108 case KVM_GET_MSRS:
2109 r = msr_io(vcpu, argp, get_msr, 1);
2110 break;
2111 case KVM_SET_MSRS:
2112 r = msr_io(vcpu, argp, do_set_msr, 0);
2113 break;
2114 default:
2115 ;
2116 }
2117out:
2118 return r;
2119}
2120
2121static long kvm_vm_ioctl(struct file *filp,
2122 unsigned int ioctl, unsigned long arg)
2123{
2124 struct kvm *kvm = filp->private_data;
2125 void __user *argp = (void __user *)arg;
2126 int r = -EINVAL;
2127
2128 switch (ioctl) {
2129 case KVM_CREATE_VCPU:
2130 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2131 if (r < 0)
2132 goto out;
2133 break;
6aa8b732
AK		 2134 case KVM_SET_MEMORY_REGION: {
2135 struct kvm_memory_region kvm_mem;
2136
2137 r = -EFAULT;
2f366987 2138 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
6aa8b732 2139 goto out;
2c6f5df9 2140 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
6aa8b732
AK		 2141 if (r)
2142 goto out;
2143 break;
2144 }
2145 case KVM_GET_DIRTY_LOG: {
2146 struct kvm_dirty_log log;
2147
2148 r = -EFAULT;
2f366987 2149 if (copy_from_user(&log, argp, sizeof log))
6aa8b732 2150 goto out;
2c6f5df9 2151 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
6aa8b732
AK		 2152 if (r)
2153 goto out;
2154 break;
2155 }
f17abe9a
AK		 2156 default:
2157 ;
2158 }
2159out:
2160 return r;
2161}
2162
2163static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2164 unsigned long address,
2165 int *type)
2166{
2167 struct kvm *kvm = vma->vm_file->private_data;
2168 unsigned long pgoff;
2169 struct kvm_memory_slot *slot;
2170 struct page *page;
2171
2172 *type = VM_FAULT_MINOR;
2173 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2174 slot = gfn_to_memslot(kvm, pgoff);
2175 if (!slot)
2176 return NOPAGE_SIGBUS;
2177 page = gfn_to_page(slot, pgoff);
2178 if (!page)
2179 return NOPAGE_SIGBUS;
2180 get_page(page);
2181 return page;
2182}
2183
2184static struct vm_operations_struct kvm_vm_vm_ops = {
2185 .nopage = kvm_vm_nopage,
2186};
2187
2188static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2189{
2190 vma->vm_ops = &kvm_vm_vm_ops;
2191 return 0;
2192}
2193
2194static struct file_operations kvm_vm_fops = {
2195 .release = kvm_vm_release,
2196 .unlocked_ioctl = kvm_vm_ioctl,
2197 .compat_ioctl = kvm_vm_ioctl,
2198 .mmap = kvm_vm_mmap,
2199};
2200
2201static int kvm_dev_ioctl_create_vm(void)
2202{
2203 int fd, r;
2204 struct inode *inode;
2205 struct file *file;
2206 struct kvm *kvm;
2207
2208 inode = kvmfs_inode(&kvm_vm_fops);
2209 if (IS_ERR(inode)) {
2210 r = PTR_ERR(inode);
2211 goto out1;
2212 }
2213
2214 kvm = kvm_create_vm();
2215 if (IS_ERR(kvm)) {
2216 r = PTR_ERR(kvm);
2217 goto out2;
2218 }
2219
2220 file = kvmfs_file(inode, kvm);
2221 if (IS_ERR(file)) {
2222 r = PTR_ERR(file);
2223 goto out3;
2224 }
bccf2150 2225 kvm->filp = file;
f17abe9a
AK		 2226
2227 r = get_unused_fd();
2228 if (r < 0)
2229 goto out4;
2230 fd = r;
2231 fd_install(fd, file);
2232
2233 return fd;
2234
2235out4:
2236 fput(file);
2237out3:
2238 kvm_destroy_vm(kvm);
2239out2:
2240 iput(inode);
2241out1:
2242 return r;
2243}
2244
2245static long kvm_dev_ioctl(struct file *filp,
2246 unsigned int ioctl, unsigned long arg)
2247{
2248 void __user *argp = (void __user *)arg;
2249 int r = -EINVAL;
2250
2251 switch (ioctl) {
2252 case KVM_GET_API_VERSION:
2253 r = KVM_API_VERSION;
2254 break;
2255 case KVM_CREATE_VM:
2256 r = kvm_dev_ioctl_create_vm();
2257 break;
6aa8b732 2258 case KVM_GET_MSR_INDEX_LIST: {
2f366987 2259 struct kvm_msr_list __user *user_msr_list = argp;
6aa8b732
AK		 2260 struct kvm_msr_list msr_list;
2261 unsigned n;
2262
2263 r = -EFAULT;
2264 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2265 goto out;
2266 n = msr_list.nmsrs;
6f00e68f 2267 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
6aa8b732
AK		 2268 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2269 goto out;
2270 r = -E2BIG;
bf591b24 2271 if (n < num_msrs_to_save)
6aa8b732
AK		 2272 goto out;
2273 r = -EFAULT;
2274 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 2275 num_msrs_to_save * sizeof(u32)))
6aa8b732 2276 goto out;
6f00e68f
AK		 2277 if (copy_to_user(user_msr_list->indices
2278 + num_msrs_to_save * sizeof(u32),
2279 &emulated_msrs,
2280 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2281 goto out;
6aa8b732 2282 r = 0;
cc1d8955 2283 break;
6aa8b732
AK		 2284 }
2285 default:
2286 ;
2287 }
2288out:
2289 return r;
2290}
2291
6aa8b732
AK		 2292static struct file_operations kvm_chardev_ops = {
2293 .open = kvm_dev_open,
2294 .release = kvm_dev_release,
2295 .unlocked_ioctl = kvm_dev_ioctl,
2296 .compat_ioctl = kvm_dev_ioctl,
6aa8b732
AK		 2297};
2298
2299static struct miscdevice kvm_dev = {
2300 MISC_DYNAMIC_MINOR,
2301 "kvm",
2302 &kvm_chardev_ops,
2303};
2304
2305static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2306 void *v)
2307{
2308 if (val == SYS_RESTART) {
2309 /*
2310 * Some (well, at least mine) BIOSes hang on reboot if
2311 * in vmx root mode.
2312 */
2313 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
8b6d44c7 2314 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2315 }
2316 return NOTIFY_OK;
2317}
2318
2319static struct notifier_block kvm_reboot_notifier = {
2320 .notifier_call = kvm_reboot,
2321 .priority = 0,
2322};
2323
774c47f1
AK		 2324/*
2325 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2326 * cached on it.
2327 */
2328static void decache_vcpus_on_cpu(int cpu)
2329{
2330 struct kvm *vm;
2331 struct kvm_vcpu *vcpu;
2332 int i;
2333
2334 spin_lock(&kvm_lock);
2335 list_for_each_entry(vm, &vm_list, vm_list)
2336 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2337 vcpu = &vm->vcpus[i];
2338 /*
2339 * If the vcpu is locked, then it is running on some
2340 * other cpu and therefore it is not cached on the
2341 * cpu in question.
2342 *
2343 * If it's not locked, check the last cpu it executed
2344 * on.
2345 */
2346 if (mutex_trylock(&vcpu->mutex)) {
2347 if (vcpu->cpu == cpu) {
2348 kvm_arch_ops->vcpu_decache(vcpu);
2349 vcpu->cpu = -1;
2350 }
2351 mutex_unlock(&vcpu->mutex);
2352 }
2353 }
2354 spin_unlock(&kvm_lock);
2355}
2356
2357static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2358 void *v)
2359{
2360 int cpu = (long)v;
2361
2362 switch (val) {
43934a38 2363 case CPU_DOWN_PREPARE:
774c47f1 2364 case CPU_UP_CANCELED:
43934a38
JK		 2365 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2366 cpu);
774c47f1
AK		 2367 decache_vcpus_on_cpu(cpu);
2368 smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
2369 NULL, 0, 1);
2370 break;
43934a38
JK		 2371 case CPU_ONLINE:
2372 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2373 cpu);
774c47f1
AK		 2374 smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
2375 NULL, 0, 1);
2376 break;
2377 }
2378 return NOTIFY_OK;
2379}
2380
2381static struct notifier_block kvm_cpu_notifier = {
2382 .notifier_call = kvm_cpu_hotplug,
2383 .priority = 20, /* must be > scheduler priority */
2384};
2385
6aa8b732
AK		 2386static __init void kvm_init_debug(void)
2387{
2388 struct kvm_stats_debugfs_item *p;
2389
8b6d44c7 2390 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732
AK		 2391 for (p = debugfs_entries; p->name; ++p)
2392 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
2393 p->data);
2394}
2395
2396static void kvm_exit_debug(void)
2397{
2398 struct kvm_stats_debugfs_item *p;
2399
2400 for (p = debugfs_entries; p->name; ++p)
2401 debugfs_remove(p->dentry);
2402 debugfs_remove(debugfs_dir);
2403}
2404
59ae6c6b
AK		 2405static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2406{
2407 decache_vcpus_on_cpu(raw_smp_processor_id());
19d1408d 2408 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
59ae6c6b
AK		 2409 return 0;
2410}
2411
2412static int kvm_resume(struct sys_device *dev)
2413{
19d1408d 2414 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
59ae6c6b
AK		 2415 return 0;
2416}
2417
2418static struct sysdev_class kvm_sysdev_class = {
2419 set_kset_name("kvm"),
2420 .suspend = kvm_suspend,
2421 .resume = kvm_resume,
2422};
2423
2424static struct sys_device kvm_sysdev = {
2425 .id = 0,
2426 .cls = &kvm_sysdev_class,
2427};
2428
6aa8b732
AK		 2429hpa_t bad_page_address;
2430
37e29d90
AK		 2431static int kvmfs_get_sb(struct file_system_type *fs_type, int flags,
2432 const char *dev_name, void *data, struct vfsmount *mnt)
2433{
2434 return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_MAGIC, mnt);
2435}
2436
2437static struct file_system_type kvm_fs_type = {
2438 .name = "kvmfs",
2439 .get_sb = kvmfs_get_sb,
2440 .kill_sb = kill_anon_super,
2441};
2442
6aa8b732
AK		 2443int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
2444{
2445 int r;
2446
09db28b8
YI		 2447 if (kvm_arch_ops) {
2448 printk(KERN_ERR "kvm: already loaded the other module\n");
2449 return -EEXIST;
2450 }
2451
e097f35c 2452 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 2453 printk(KERN_ERR "kvm: no hardware support\n");
2454 return -EOPNOTSUPP;
2455 }
e097f35c 2456 if (ops->disabled_by_bios()) {
6aa8b732
AK		 2457 printk(KERN_ERR "kvm: disabled by bios\n");
2458 return -EOPNOTSUPP;
2459 }
2460
e097f35c
YI		 2461 kvm_arch_ops = ops;
2462
6aa8b732
AK		 2463 r = kvm_arch_ops->hardware_setup();
2464 if (r < 0)
2465 return r;
2466
8b6d44c7 2467 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
774c47f1
AK		 2468 r = register_cpu_notifier(&kvm_cpu_notifier);
2469 if (r)
2470 goto out_free_1;
6aa8b732
AK		 2471 register_reboot_notifier(&kvm_reboot_notifier);
2472
59ae6c6b
AK		 2473 r = sysdev_class_register(&kvm_sysdev_class);
2474 if (r)
2475 goto out_free_2;
2476
2477 r = sysdev_register(&kvm_sysdev);
2478 if (r)
2479 goto out_free_3;
2480
6aa8b732
AK		 2481 kvm_chardev_ops.owner = module;
2482
2483 r = misc_register(&kvm_dev);
2484 if (r) {
2485 printk (KERN_ERR "kvm: misc device register failed\n");
2486 goto out_free;
2487 }
2488
2489 return r;
2490
2491out_free:
59ae6c6b
AK		 2492 sysdev_unregister(&kvm_sysdev);
2493out_free_3:
2494 sysdev_class_unregister(&kvm_sysdev_class);
2495out_free_2:
6aa8b732 2496 unregister_reboot_notifier(&kvm_reboot_notifier);
774c47f1
AK		 2497 unregister_cpu_notifier(&kvm_cpu_notifier);
2498out_free_1:
8b6d44c7 2499 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2500 kvm_arch_ops->hardware_unsetup();
2501 return r;
2502}
2503
2504void kvm_exit_arch(void)
2505{
2506 misc_deregister(&kvm_dev);
59ae6c6b
AK		 2507 sysdev_unregister(&kvm_sysdev);
2508 sysdev_class_unregister(&kvm_sysdev_class);
6aa8b732 2509 unregister_reboot_notifier(&kvm_reboot_notifier);
59ae6c6b 2510 unregister_cpu_notifier(&kvm_cpu_notifier);
8b6d44c7 2511 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 2512 kvm_arch_ops->hardware_unsetup();
09db28b8 2513 kvm_arch_ops = NULL;
6aa8b732
AK		 2514}
2515
2516static __init int kvm_init(void)
2517{
2518 static struct page *bad_page;
37e29d90
AK		 2519 int r;
2520
2521 r = register_filesystem(&kvm_fs_type);
2522 if (r)
2523 goto out3;
6aa8b732 2524
37e29d90
AK		 2525 kvmfs_mnt = kern_mount(&kvm_fs_type);
2526 r = PTR_ERR(kvmfs_mnt);
2527 if (IS_ERR(kvmfs_mnt))
2528 goto out2;
6aa8b732
AK		 2529 kvm_init_debug();
2530
bf591b24
MR		 2531 kvm_init_msr_list();
2532
6aa8b732
AK		 2533 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2534 r = -ENOMEM;
2535 goto out;
2536 }
2537
2538 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2539 memset(__va(bad_page_address), 0, PAGE_SIZE);
2540
2541 return r;
2542
2543out:
2544 kvm_exit_debug();
37e29d90
AK		 2545 mntput(kvmfs_mnt);
2546out2:
2547 unregister_filesystem(&kvm_fs_type);
2548out3:
6aa8b732
AK		 2549 return r;
2550}
2551
2552static __exit void kvm_exit(void)
2553{
2554 kvm_exit_debug();
2555 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
37e29d90
AK		 2556 mntput(kvmfs_mnt);
2557 unregister_filesystem(&kvm_fs_type);
6aa8b732
AK		 2558}
2559
2560module_init(kvm_init)
2561module_exit(kvm_exit)
2562
2563EXPORT_SYMBOL_GPL(kvm_init_arch);
2564EXPORT_SYMBOL_GPL(kvm_exit_arch);
Linux kernel - Deliverables
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