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[PATCH] KVM: Fix oops on oom
[thirdparty/kernel/stable.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>
37
38#include "x86_emulate.h"
39#include "segment_descriptor.h"
40
41MODULE_AUTHOR("Qumranet");
42MODULE_LICENSE("GPL");
43
44struct kvm_arch_ops *kvm_arch_ops;
45struct kvm_stat kvm_stat;
46EXPORT_SYMBOL_GPL(kvm_stat);
47
48static struct kvm_stats_debugfs_item {
49 const char *name;
50 u32 *data;
51 struct dentry *dentry;
52} debugfs_entries[] = {
53 { "pf_fixed", &kvm_stat.pf_fixed },
54 { "pf_guest", &kvm_stat.pf_guest },
55 { "tlb_flush", &kvm_stat.tlb_flush },
56 { "invlpg", &kvm_stat.invlpg },
57 { "exits", &kvm_stat.exits },
58 { "io_exits", &kvm_stat.io_exits },
59 { "mmio_exits", &kvm_stat.mmio_exits },
60 { "signal_exits", &kvm_stat.signal_exits },
61 { "irq_exits", &kvm_stat.irq_exits },
62 { 0, 0 }
63};
64
65static struct dentry *debugfs_dir;
66
67#define MAX_IO_MSRS 256
68
69#define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
70#define LMSW_GUEST_MASK 0x0eULL
71#define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
72#define CR8_RESEVED_BITS (~0x0fULL)
73#define EFER_RESERVED_BITS 0xfffffffffffff2fe
74
05b3e0c2 75#ifdef CONFIG_X86_64
6aa8b732
AK		 76// LDT or TSS descriptor in the GDT. 16 bytes.
77struct segment_descriptor_64 {
78 struct segment_descriptor s;
79 u32 base_higher;
80 u32 pad_zero;
81};
82
83#endif
84
85unsigned long segment_base(u16 selector)
86{
87 struct descriptor_table gdt;
88 struct segment_descriptor *d;
89 unsigned long table_base;
90 typedef unsigned long ul;
91 unsigned long v;
92
93 if (selector == 0)
94 return 0;
95
96 asm ("sgdt %0" : "=m"(gdt));
97 table_base = gdt.base;
98
99 if (selector & 4) { /* from ldt */
100 u16 ldt_selector;
101
102 asm ("sldt %0" : "=g"(ldt_selector));
103 table_base = segment_base(ldt_selector);
104 }
105 d = (struct segment_descriptor *)(table_base + (selector & ~7));
106 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
05b3e0c2 107#ifdef CONFIG_X86_64
6aa8b732
AK		 108 if (d->system == 0
109 && (d->type == 2 || d->type == 9 || d->type == 11))
110 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
111#endif
112 return v;
113}
114EXPORT_SYMBOL_GPL(segment_base);
115
5aacf0ca
JM		 116static inline int valid_vcpu(int n)
117{
118 return likely(n >= 0 && n < KVM_MAX_VCPUS);
119}
120
6aa8b732
AK		 121int kvm_read_guest(struct kvm_vcpu *vcpu,
122 gva_t addr,
123 unsigned long size,
124 void *dest)
125{
126 unsigned char *host_buf = dest;
127 unsigned long req_size = size;
128
129 while (size) {
130 hpa_t paddr;
131 unsigned now;
132 unsigned offset;
133 hva_t guest_buf;
134
135 paddr = gva_to_hpa(vcpu, addr);
136
137 if (is_error_hpa(paddr))
138 break;
139
140 guest_buf = (hva_t)kmap_atomic(
141 pfn_to_page(paddr >> PAGE_SHIFT),
142 KM_USER0);
143 offset = addr & ~PAGE_MASK;
144 guest_buf |= offset;
145 now = min(size, PAGE_SIZE - offset);
146 memcpy(host_buf, (void*)guest_buf, now);
147 host_buf += now;
148 addr += now;
149 size -= now;
150 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
151 }
152 return req_size - size;
153}
154EXPORT_SYMBOL_GPL(kvm_read_guest);
155
156int kvm_write_guest(struct kvm_vcpu *vcpu,
157 gva_t addr,
158 unsigned long size,
159 void *data)
160{
161 unsigned char *host_buf = data;
162 unsigned long req_size = size;
163
164 while (size) {
165 hpa_t paddr;
166 unsigned now;
167 unsigned offset;
168 hva_t guest_buf;
169
170 paddr = gva_to_hpa(vcpu, addr);
171
172 if (is_error_hpa(paddr))
173 break;
174
175 guest_buf = (hva_t)kmap_atomic(
176 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
177 offset = addr & ~PAGE_MASK;
178 guest_buf |= offset;
179 now = min(size, PAGE_SIZE - offset);
180 memcpy((void*)guest_buf, host_buf, now);
181 host_buf += now;
182 addr += now;
183 size -= now;
184 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
185 }
186 return req_size - size;
187}
188EXPORT_SYMBOL_GPL(kvm_write_guest);
189
190static int vcpu_slot(struct kvm_vcpu *vcpu)
191{
192 return vcpu - vcpu->kvm->vcpus;
193}
194
195/*
196 * Switches to specified vcpu, until a matching vcpu_put()
197 */
198static struct kvm_vcpu *vcpu_load(struct kvm *kvm, int vcpu_slot)
199{
200 struct kvm_vcpu *vcpu = &kvm->vcpus[vcpu_slot];
201
202 mutex_lock(&vcpu->mutex);
203 if (unlikely(!vcpu->vmcs)) {
204 mutex_unlock(&vcpu->mutex);
205 return 0;
206 }
207 return kvm_arch_ops->vcpu_load(vcpu);
208}
209
210static void vcpu_put(struct kvm_vcpu *vcpu)
211{
212 kvm_arch_ops->vcpu_put(vcpu);
6aa8b732
AK		 213 mutex_unlock(&vcpu->mutex);
214}
215
216static int kvm_dev_open(struct inode *inode, struct file *filp)
217{
218 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
219 int i;
220
221 if (!kvm)
222 return -ENOMEM;
223
224 spin_lock_init(&kvm->lock);
225 INIT_LIST_HEAD(&kvm->active_mmu_pages);
226 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
227 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
228
229 mutex_init(&vcpu->mutex);
230 vcpu->mmu.root_hpa = INVALID_PAGE;
231 INIT_LIST_HEAD(&vcpu->free_pages);
232 }
233 filp->private_data = kvm;
234 return 0;
235}
236
237/*
238 * Free any memory in @free but not in @dont.
239 */
240static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
241 struct kvm_memory_slot *dont)
242{
243 int i;
244
245 if (!dont || free->phys_mem != dont->phys_mem)
246 if (free->phys_mem) {
247 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 248 if (free->phys_mem[i])
249 __free_page(free->phys_mem[i]);
6aa8b732
AK		 250 vfree(free->phys_mem);
251 }
252
253 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
254 vfree(free->dirty_bitmap);
255
256 free->phys_mem = 0;
257 free->npages = 0;
258 free->dirty_bitmap = 0;
259}
260
261static void kvm_free_physmem(struct kvm *kvm)
262{
263 int i;
264
265 for (i = 0; i < kvm->nmemslots; ++i)
266 kvm_free_physmem_slot(&kvm->memslots[i], 0);
267}
268
269static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
270{
271 kvm_arch_ops->vcpu_free(vcpu);
272 kvm_mmu_destroy(vcpu);
273}
274
275static void kvm_free_vcpus(struct kvm *kvm)
276{
277 unsigned int i;
278
279 for (i = 0; i < KVM_MAX_VCPUS; ++i)
280 kvm_free_vcpu(&kvm->vcpus[i]);
281}
282
283static int kvm_dev_release(struct inode *inode, struct file *filp)
284{
285 struct kvm *kvm = filp->private_data;
286
287 kvm_free_vcpus(kvm);
288 kvm_free_physmem(kvm);
289 kfree(kvm);
290 return 0;
291}
292
293static void inject_gp(struct kvm_vcpu *vcpu)
294{
295 kvm_arch_ops->inject_gp(vcpu, 0);
296}
297
298static int pdptrs_have_reserved_bits_set(struct kvm_vcpu *vcpu,
299 unsigned long cr3)
300{
301 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
302 unsigned offset = (cr3 & (PAGE_SIZE-1)) >> 5;
303 int i;
304 u64 pdpte;
305 u64 *pdpt;
306 struct kvm_memory_slot *memslot;
307
308 spin_lock(&vcpu->kvm->lock);
309 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
310 /* FIXME: !memslot - emulate? 0xff? */
311 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
312
313 for (i = 0; i < 4; ++i) {
314 pdpte = pdpt[offset + i];
315 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull))
316 break;
317 }
318
319 kunmap_atomic(pdpt, KM_USER0);
320 spin_unlock(&vcpu->kvm->lock);
321
322 return i != 4;
323}
324
325void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
326{
327 if (cr0 & CR0_RESEVED_BITS) {
328 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
329 cr0, vcpu->cr0);
330 inject_gp(vcpu);
331 return;
332 }
333
334 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
335 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
336 inject_gp(vcpu);
337 return;
338 }
339
340 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
341 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
342 "and a clear PE flag\n");
343 inject_gp(vcpu);
344 return;
345 }
346
347 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 348#ifdef CONFIG_X86_64
6aa8b732
AK		 349 if ((vcpu->shadow_efer & EFER_LME)) {
350 int cs_db, cs_l;
351
352 if (!is_pae(vcpu)) {
353 printk(KERN_DEBUG "set_cr0: #GP, start paging "
354 "in long mode while PAE is disabled\n");
355 inject_gp(vcpu);
356 return;
357 }
358 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
359 if (cs_l) {
360 printk(KERN_DEBUG "set_cr0: #GP, start paging "
361 "in long mode while CS.L == 1\n");
362 inject_gp(vcpu);
363 return;
364
365 }
366 } else
367#endif
368 if (is_pae(vcpu) &&
369 pdptrs_have_reserved_bits_set(vcpu, vcpu->cr3)) {
370 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
371 "reserved bits\n");
372 inject_gp(vcpu);
373 return;
374 }
375
376 }
377
378 kvm_arch_ops->set_cr0(vcpu, cr0);
379 vcpu->cr0 = cr0;
380
381 spin_lock(&vcpu->kvm->lock);
382 kvm_mmu_reset_context(vcpu);
383 spin_unlock(&vcpu->kvm->lock);
384 return;
385}
386EXPORT_SYMBOL_GPL(set_cr0);
387
388void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
389{
390 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
391}
392EXPORT_SYMBOL_GPL(lmsw);
393
394void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
395{
396 if (cr4 & CR4_RESEVED_BITS) {
397 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
398 inject_gp(vcpu);
399 return;
400 }
401
a9058ecd 402 if (is_long_mode(vcpu)) {
6aa8b732
AK		 403 if (!(cr4 & CR4_PAE_MASK)) {
404 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
405 "in long mode\n");
406 inject_gp(vcpu);
407 return;
408 }
409 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
410 && pdptrs_have_reserved_bits_set(vcpu, vcpu->cr3)) {
411 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
412 inject_gp(vcpu);
413 }
414
415 if (cr4 & CR4_VMXE_MASK) {
416 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
417 inject_gp(vcpu);
418 return;
419 }
420 kvm_arch_ops->set_cr4(vcpu, cr4);
421 spin_lock(&vcpu->kvm->lock);
422 kvm_mmu_reset_context(vcpu);
423 spin_unlock(&vcpu->kvm->lock);
424}
425EXPORT_SYMBOL_GPL(set_cr4);
426
427void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
428{
a9058ecd 429 if (is_long_mode(vcpu)) {
6aa8b732
AK		 430 if ( cr3 & CR3_L_MODE_RESEVED_BITS) {
431 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
432 inject_gp(vcpu);
433 return;
434 }
435 } else {
436 if (cr3 & CR3_RESEVED_BITS) {
437 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
438 inject_gp(vcpu);
439 return;
440 }
441 if (is_paging(vcpu) && is_pae(vcpu) &&
442 pdptrs_have_reserved_bits_set(vcpu, cr3)) {
443 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
444 "reserved bits\n");
445 inject_gp(vcpu);
446 return;
447 }
448 }
449
450 vcpu->cr3 = cr3;
451 spin_lock(&vcpu->kvm->lock);
452 vcpu->mmu.new_cr3(vcpu);
453 spin_unlock(&vcpu->kvm->lock);
454}
455EXPORT_SYMBOL_GPL(set_cr3);
456
457void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
458{
459 if ( cr8 & CR8_RESEVED_BITS) {
460 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
461 inject_gp(vcpu);
462 return;
463 }
464 vcpu->cr8 = cr8;
465}
466EXPORT_SYMBOL_GPL(set_cr8);
467
468void fx_init(struct kvm_vcpu *vcpu)
469{
470 struct __attribute__ ((__packed__)) fx_image_s {
471 u16 control; //fcw
472 u16 status; //fsw
473 u16 tag; // ftw
474 u16 opcode; //fop
475 u64 ip; // fpu ip
476 u64 operand;// fpu dp
477 u32 mxcsr;
478 u32 mxcsr_mask;
479
480 } *fx_image;
481
482 fx_save(vcpu->host_fx_image);
483 fpu_init();
484 fx_save(vcpu->guest_fx_image);
485 fx_restore(vcpu->host_fx_image);
486
487 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
488 fx_image->mxcsr = 0x1f80;
489 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
490 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
491}
492EXPORT_SYMBOL_GPL(fx_init);
493
494/*
495 * Creates some virtual cpus. Good luck creating more than one.
496 */
497static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
498{
499 int r;
500 struct kvm_vcpu *vcpu;
501
502 r = -EINVAL;
5aacf0ca 503 if (!valid_vcpu(n))
6aa8b732
AK		 504 goto out;
505
506 vcpu = &kvm->vcpus[n];
507
508 mutex_lock(&vcpu->mutex);
509
510 if (vcpu->vmcs) {
511 mutex_unlock(&vcpu->mutex);
512 return -EEXIST;
513 }
514
515 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
516 FX_IMAGE_ALIGN);
517 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
518
519 vcpu->cpu = -1; /* First load will set up TR */
520 vcpu->kvm = kvm;
521 r = kvm_arch_ops->vcpu_create(vcpu);
522 if (r < 0)
523 goto out_free_vcpus;
524
525 kvm_arch_ops->vcpu_load(vcpu);
526
527 r = kvm_arch_ops->vcpu_setup(vcpu);
528 if (r >= 0)
529 r = kvm_mmu_init(vcpu);
530
531 vcpu_put(vcpu);
532
533 if (r < 0)
534 goto out_free_vcpus;
535
536 return 0;
537
538out_free_vcpus:
539 kvm_free_vcpu(vcpu);
540 mutex_unlock(&vcpu->mutex);
541out:
542 return r;
543}
544
545/*
546 * Allocate some memory and give it an address in the guest physical address
547 * space.
548 *
549 * Discontiguous memory is allowed, mostly for framebuffers.
550 */
551static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm,
552 struct kvm_memory_region *mem)
553{
554 int r;
555 gfn_t base_gfn;
556 unsigned long npages;
557 unsigned long i;
558 struct kvm_memory_slot *memslot;
559 struct kvm_memory_slot old, new;
560 int memory_config_version;
561
562 r = -EINVAL;
563 /* General sanity checks */
564 if (mem->memory_size & (PAGE_SIZE - 1))
565 goto out;
566 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
567 goto out;
568 if (mem->slot >= KVM_MEMORY_SLOTS)
569 goto out;
570 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
571 goto out;
572
573 memslot = &kvm->memslots[mem->slot];
574 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
575 npages = mem->memory_size >> PAGE_SHIFT;
576
577 if (!npages)
578 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
579
580raced:
581 spin_lock(&kvm->lock);
582
583 memory_config_version = kvm->memory_config_version;
584 new = old = *memslot;
585
586 new.base_gfn = base_gfn;
587 new.npages = npages;
588 new.flags = mem->flags;
589
590 /* Disallow changing a memory slot's size. */
591 r = -EINVAL;
592 if (npages && old.npages && npages != old.npages)
593 goto out_unlock;
594
595 /* Check for overlaps */
596 r = -EEXIST;
597 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
598 struct kvm_memory_slot *s = &kvm->memslots[i];
599
600 if (s == memslot)
601 continue;
602 if (!((base_gfn + npages <= s->base_gfn) ||
603 (base_gfn >= s->base_gfn + s->npages)))
604 goto out_unlock;
605 }
606 /*
607 * Do memory allocations outside lock. memory_config_version will
608 * detect any races.
609 */
610 spin_unlock(&kvm->lock);
611
612 /* Deallocate if slot is being removed */
613 if (!npages)
614 new.phys_mem = 0;
615
616 /* Free page dirty bitmap if unneeded */
617 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
618 new.dirty_bitmap = 0;
619
620 r = -ENOMEM;
621
622 /* Allocate if a slot is being created */
623 if (npages && !new.phys_mem) {
624 new.phys_mem = vmalloc(npages * sizeof(struct page *));
625
626 if (!new.phys_mem)
627 goto out_free;
628
629 memset(new.phys_mem, 0, npages * sizeof(struct page *));
630 for (i = 0; i < npages; ++i) {
631 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
632 | __GFP_ZERO);
633 if (!new.phys_mem[i])
634 goto out_free;
635 }
636 }
637
638 /* Allocate page dirty bitmap if needed */
639 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
640 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
641
642 new.dirty_bitmap = vmalloc(dirty_bytes);
643 if (!new.dirty_bitmap)
644 goto out_free;
645 memset(new.dirty_bitmap, 0, dirty_bytes);
646 }
647
648 spin_lock(&kvm->lock);
649
650 if (memory_config_version != kvm->memory_config_version) {
651 spin_unlock(&kvm->lock);
652 kvm_free_physmem_slot(&new, &old);
653 goto raced;
654 }
655
656 r = -EAGAIN;
657 if (kvm->busy)
658 goto out_unlock;
659
660 if (mem->slot >= kvm->nmemslots)
661 kvm->nmemslots = mem->slot + 1;
662
663 *memslot = new;
664 ++kvm->memory_config_version;
665
666 spin_unlock(&kvm->lock);
667
668 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
669 struct kvm_vcpu *vcpu;
670
671 vcpu = vcpu_load(kvm, i);
672 if (!vcpu)
673 continue;
674 kvm_mmu_reset_context(vcpu);
675 vcpu_put(vcpu);
676 }
677
678 kvm_free_physmem_slot(&old, &new);
679 return 0;
680
681out_unlock:
682 spin_unlock(&kvm->lock);
683out_free:
684 kvm_free_physmem_slot(&new, &old);
685out:
686 return r;
687}
688
689/*
690 * Get (and clear) the dirty memory log for a memory slot.
691 */
692static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
693 struct kvm_dirty_log *log)
694{
695 struct kvm_memory_slot *memslot;
696 int r, i;
697 int n;
698 unsigned long any = 0;
699
700 spin_lock(&kvm->lock);
701
702 /*
703 * Prevent changes to guest memory configuration even while the lock
704 * is not taken.
705 */
706 ++kvm->busy;
707 spin_unlock(&kvm->lock);
708 r = -EINVAL;
709 if (log->slot >= KVM_MEMORY_SLOTS)
710 goto out;
711
712 memslot = &kvm->memslots[log->slot];
713 r = -ENOENT;
714 if (!memslot->dirty_bitmap)
715 goto out;
716
717 n = ALIGN(memslot->npages, 8) / 8;
718
719 for (i = 0; !any && i < n; ++i)
720 any = memslot->dirty_bitmap[i];
721
722 r = -EFAULT;
723 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
724 goto out;
725
726
727 if (any) {
728 spin_lock(&kvm->lock);
729 kvm_mmu_slot_remove_write_access(kvm, log->slot);
730 spin_unlock(&kvm->lock);
731 memset(memslot->dirty_bitmap, 0, n);
732 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
733 struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
734
735 if (!vcpu)
736 continue;
737 kvm_arch_ops->tlb_flush(vcpu);
738 vcpu_put(vcpu);
739 }
740 }
741
742 r = 0;
743
744out:
745 spin_lock(&kvm->lock);
746 --kvm->busy;
747 spin_unlock(&kvm->lock);
748 return r;
749}
750
751struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
752{
753 int i;
754
755 for (i = 0; i < kvm->nmemslots; ++i) {
756 struct kvm_memory_slot *memslot = &kvm->memslots[i];
757
758 if (gfn >= memslot->base_gfn
759 && gfn < memslot->base_gfn + memslot->npages)
760 return memslot;
761 }
762 return 0;
763}
764EXPORT_SYMBOL_GPL(gfn_to_memslot);
765
766void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
767{
768 int i;
769 struct kvm_memory_slot *memslot = 0;
770 unsigned long rel_gfn;
771
772 for (i = 0; i < kvm->nmemslots; ++i) {
773 memslot = &kvm->memslots[i];
774
775 if (gfn >= memslot->base_gfn
776 && gfn < memslot->base_gfn + memslot->npages) {
777
778 if (!memslot || !memslot->dirty_bitmap)
779 return;
780
781 rel_gfn = gfn - memslot->base_gfn;
782
783 /* avoid RMW */
784 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
785 set_bit(rel_gfn, memslot->dirty_bitmap);
786 return;
787 }
788 }
789}
790
791static int emulator_read_std(unsigned long addr,
792 unsigned long *val,
793 unsigned int bytes,
794 struct x86_emulate_ctxt *ctxt)
795{
796 struct kvm_vcpu *vcpu = ctxt->vcpu;
797 void *data = val;
798
799 while (bytes) {
800 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
801 unsigned offset = addr & (PAGE_SIZE-1);
802 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
803 unsigned long pfn;
804 struct kvm_memory_slot *memslot;
805 void *page;
806
807 if (gpa == UNMAPPED_GVA)
808 return X86EMUL_PROPAGATE_FAULT;
809 pfn = gpa >> PAGE_SHIFT;
810 memslot = gfn_to_memslot(vcpu->kvm, pfn);
811 if (!memslot)
812 return X86EMUL_UNHANDLEABLE;
813 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
814
815 memcpy(data, page + offset, tocopy);
816
817 kunmap_atomic(page, KM_USER0);
818
819 bytes -= tocopy;
820 data += tocopy;
821 addr += tocopy;
822 }
823
824 return X86EMUL_CONTINUE;
825}
826
827static int emulator_write_std(unsigned long addr,
828 unsigned long val,
829 unsigned int bytes,
830 struct x86_emulate_ctxt *ctxt)
831{
832 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
833 addr, bytes);
834 return X86EMUL_UNHANDLEABLE;
835}
836
837static int emulator_read_emulated(unsigned long addr,
838 unsigned long *val,
839 unsigned int bytes,
840 struct x86_emulate_ctxt *ctxt)
841{
842 struct kvm_vcpu *vcpu = ctxt->vcpu;
843
844 if (vcpu->mmio_read_completed) {
845 memcpy(val, vcpu->mmio_data, bytes);
846 vcpu->mmio_read_completed = 0;
847 return X86EMUL_CONTINUE;
848 } else if (emulator_read_std(addr, val, bytes, ctxt)
849 == X86EMUL_CONTINUE)
850 return X86EMUL_CONTINUE;
851 else {
852 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
853 if (gpa == UNMAPPED_GVA)
854 return vcpu_printf(vcpu, "not present\n"), X86EMUL_PROPAGATE_FAULT;
855 vcpu->mmio_needed = 1;
856 vcpu->mmio_phys_addr = gpa;
857 vcpu->mmio_size = bytes;
858 vcpu->mmio_is_write = 0;
859
860 return X86EMUL_UNHANDLEABLE;
861 }
862}
863
864static int emulator_write_emulated(unsigned long addr,
865 unsigned long val,
866 unsigned int bytes,
867 struct x86_emulate_ctxt *ctxt)
868{
869 struct kvm_vcpu *vcpu = ctxt->vcpu;
870 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
871
872 if (gpa == UNMAPPED_GVA)
873 return X86EMUL_PROPAGATE_FAULT;
874
875 vcpu->mmio_needed = 1;
876 vcpu->mmio_phys_addr = gpa;
877 vcpu->mmio_size = bytes;
878 vcpu->mmio_is_write = 1;
879 memcpy(vcpu->mmio_data, &val, bytes);
880
881 return X86EMUL_CONTINUE;
882}
883
884static int emulator_cmpxchg_emulated(unsigned long addr,
885 unsigned long old,
886 unsigned long new,
887 unsigned int bytes,
888 struct x86_emulate_ctxt *ctxt)
889{
890 static int reported;
891
892 if (!reported) {
893 reported = 1;
894 printk(KERN_WARNING "kvm: emulating exchange as write\n");
895 }
896 return emulator_write_emulated(addr, new, bytes, ctxt);
897}
898
899static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
900{
901 return kvm_arch_ops->get_segment_base(vcpu, seg);
902}
903
904int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
905{
906 spin_lock(&vcpu->kvm->lock);
907 vcpu->mmu.inval_page(vcpu, address);
908 spin_unlock(&vcpu->kvm->lock);
909 kvm_arch_ops->invlpg(vcpu, address);
910 return X86EMUL_CONTINUE;
911}
912
913int emulate_clts(struct kvm_vcpu *vcpu)
914{
915 unsigned long cr0 = vcpu->cr0;
916
917 cr0 &= ~CR0_TS_MASK;
918 kvm_arch_ops->set_cr0(vcpu, cr0);
919 return X86EMUL_CONTINUE;
920}
921
922int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
923{
924 struct kvm_vcpu *vcpu = ctxt->vcpu;
925
926 switch (dr) {
927 case 0 ... 3:
928 *dest = kvm_arch_ops->get_dr(vcpu, dr);
929 return X86EMUL_CONTINUE;
930 default:
931 printk(KERN_DEBUG "%s: unexpected dr %u\n",
932 __FUNCTION__, dr);
933 return X86EMUL_UNHANDLEABLE;
934 }
935}
936
937int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
938{
939 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
940 int exception;
941
942 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
943 if (exception) {
944 /* FIXME: better handling */
945 return X86EMUL_UNHANDLEABLE;
946 }
947 return X86EMUL_CONTINUE;
948}
949
950static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
951{
952 static int reported;
953 u8 opcodes[4];
954 unsigned long rip = ctxt->vcpu->rip;
955 unsigned long rip_linear;
956
957 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
958
959 if (reported)
960 return;
961
962 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
963
964 printk(KERN_ERR "emulation failed but !mmio_needed?"
965 " rip %lx %02x %02x %02x %02x\n",
966 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
967 reported = 1;
968}
969
970struct x86_emulate_ops emulate_ops = {
971 .read_std = emulator_read_std,
972 .write_std = emulator_write_std,
973 .read_emulated = emulator_read_emulated,
974 .write_emulated = emulator_write_emulated,
975 .cmpxchg_emulated = emulator_cmpxchg_emulated,
976};
977
978int emulate_instruction(struct kvm_vcpu *vcpu,
979 struct kvm_run *run,
980 unsigned long cr2,
981 u16 error_code)
982{
983 struct x86_emulate_ctxt emulate_ctxt;
984 int r;
985 int cs_db, cs_l;
986
987 kvm_arch_ops->cache_regs(vcpu);
988
989 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
990
991 emulate_ctxt.vcpu = vcpu;
992 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
993 emulate_ctxt.cr2 = cr2;
994 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
995 ? X86EMUL_MODE_REAL : cs_l
996 ? X86EMUL_MODE_PROT64 : cs_db
997 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
998
999 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1000 emulate_ctxt.cs_base = 0;
1001 emulate_ctxt.ds_base = 0;
1002 emulate_ctxt.es_base = 0;
1003 emulate_ctxt.ss_base = 0;
1004 } else {
1005 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1006 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1007 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1008 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1009 }
1010
1011 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1012 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1013
1014 vcpu->mmio_is_write = 0;
1015 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1016
1017 if ((r || vcpu->mmio_is_write) && run) {
1018 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1019 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1020 run->mmio.len = vcpu->mmio_size;
1021 run->mmio.is_write = vcpu->mmio_is_write;
1022 }
1023
1024 if (r) {
1025 if (!vcpu->mmio_needed) {
1026 report_emulation_failure(&emulate_ctxt);
1027 return EMULATE_FAIL;
1028 }
1029 return EMULATE_DO_MMIO;
1030 }
1031
1032 kvm_arch_ops->decache_regs(vcpu);
1033 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1034
1035 if (vcpu->mmio_is_write)
1036 return EMULATE_DO_MMIO;
1037
1038 return EMULATE_DONE;
1039}
1040EXPORT_SYMBOL_GPL(emulate_instruction);
1041
1042static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1043{
1044 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1045}
1046
1047void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1048{
1049 struct descriptor_table dt = { limit, base };
1050
1051 kvm_arch_ops->set_gdt(vcpu, &dt);
1052}
1053
1054void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1055{
1056 struct descriptor_table dt = { limit, base };
1057
1058 kvm_arch_ops->set_idt(vcpu, &dt);
1059}
1060
1061void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1062 unsigned long *rflags)
1063{
1064 lmsw(vcpu, msw);
1065 *rflags = kvm_arch_ops->get_rflags(vcpu);
1066}
1067
1068unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1069{
1070 switch (cr) {
1071 case 0:
1072 return vcpu->cr0;
1073 case 2:
1074 return vcpu->cr2;
1075 case 3:
1076 return vcpu->cr3;
1077 case 4:
1078 return vcpu->cr4;
1079 default:
1080 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1081 return 0;
1082 }
1083}
1084
1085void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1086 unsigned long *rflags)
1087{
1088 switch (cr) {
1089 case 0:
1090 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1091 *rflags = kvm_arch_ops->get_rflags(vcpu);
1092 break;
1093 case 2:
1094 vcpu->cr2 = val;
1095 break;
1096 case 3:
1097 set_cr3(vcpu, val);
1098 break;
1099 case 4:
1100 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1101 break;
1102 default:
1103 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1104 }
1105}
1106
3bab1f5d
AK		 1107int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1108{
1109 u64 data;
1110
1111 switch (msr) {
1112 case 0xc0010010: /* SYSCFG */
1113 case 0xc0010015: /* HWCR */
1114 case MSR_IA32_PLATFORM_ID:
1115 case MSR_IA32_P5_MC_ADDR:
1116 case MSR_IA32_P5_MC_TYPE:
1117 case MSR_IA32_MC0_CTL:
1118 case MSR_IA32_MCG_STATUS:
1119 case MSR_IA32_MCG_CAP:
1120 case MSR_IA32_MC0_MISC:
1121 case MSR_IA32_MC0_MISC+4:
1122 case MSR_IA32_MC0_MISC+8:
1123 case MSR_IA32_MC0_MISC+12:
1124 case MSR_IA32_MC0_MISC+16:
1125 case MSR_IA32_UCODE_REV:
a8d13ea2 1126 case MSR_IA32_PERF_STATUS:
3bab1f5d
AK		 1127 /* MTRR registers */
1128 case 0xfe:
1129 case 0x200 ... 0x2ff:
1130 data = 0;
1131 break;
a8d13ea2
AK		 1132 case 0xcd: /* fsb frequency */
1133 data = 3;
1134 break;
3bab1f5d
AK		 1135 case MSR_IA32_APICBASE:
1136 data = vcpu->apic_base;
1137 break;
1138#ifdef CONFIG_X86_64
1139 case MSR_EFER:
1140 data = vcpu->shadow_efer;
1141 break;
1142#endif
1143 default:
1144 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1145 return 1;
1146 }
1147 *pdata = data;
1148 return 0;
1149}
1150EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1151
6aa8b732
AK		 1152/*
1153 * Reads an msr value (of 'msr_index') into 'pdata'.
1154 * Returns 0 on success, non-0 otherwise.
1155 * Assumes vcpu_load() was already called.
1156 */
1157static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1158{
1159 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1160}
1161
05b3e0c2 1162#ifdef CONFIG_X86_64
6aa8b732 1163
3bab1f5d 1164static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1165{
6aa8b732
AK		 1166 if (efer & EFER_RESERVED_BITS) {
1167 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1168 efer);
1169 inject_gp(vcpu);
1170 return;
1171 }
1172
1173 if (is_paging(vcpu)
1174 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1175 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1176 inject_gp(vcpu);
1177 return;
1178 }
1179
7725f0ba
AK		 1180 kvm_arch_ops->set_efer(vcpu, efer);
1181
6aa8b732
AK		 1182 efer &= ~EFER_LMA;
1183 efer |= vcpu->shadow_efer & EFER_LMA;
1184
1185 vcpu->shadow_efer = efer;
6aa8b732 1186}
6aa8b732
AK		 1187
1188#endif
1189
3bab1f5d
AK		 1190int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1191{
1192 switch (msr) {
1193#ifdef CONFIG_X86_64
1194 case MSR_EFER:
1195 set_efer(vcpu, data);
1196 break;
1197#endif
1198 case MSR_IA32_MC0_STATUS:
1199 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1200 __FUNCTION__, data);
1201 break;
1202 case MSR_IA32_UCODE_REV:
1203 case MSR_IA32_UCODE_WRITE:
1204 case 0x200 ... 0x2ff: /* MTRRs */
1205 break;
1206 case MSR_IA32_APICBASE:
1207 vcpu->apic_base = data;
1208 break;
1209 default:
1210 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1211 return 1;
1212 }
1213 return 0;
1214}
1215EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1216
6aa8b732
AK		 1217/*
1218 * Writes msr value into into the appropriate "register".
1219 * Returns 0 on success, non-0 otherwise.
1220 * Assumes vcpu_load() was already called.
1221 */
1222static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1223{
1224 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1225}
1226
1227void kvm_resched(struct kvm_vcpu *vcpu)
1228{
1229 vcpu_put(vcpu);
1230 cond_resched();
1231 /* Cannot fail - no vcpu unplug yet. */
1232 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1233}
1234EXPORT_SYMBOL_GPL(kvm_resched);
1235
1236void load_msrs(struct vmx_msr_entry *e, int n)
1237{
1238 int i;
1239
1240 for (i = 0; i < n; ++i)
1241 wrmsrl(e[i].index, e[i].data);
1242}
1243EXPORT_SYMBOL_GPL(load_msrs);
1244
1245void save_msrs(struct vmx_msr_entry *e, int n)
1246{
1247 int i;
1248
1249 for (i = 0; i < n; ++i)
1250 rdmsrl(e[i].index, e[i].data);
1251}
1252EXPORT_SYMBOL_GPL(save_msrs);
1253
1254static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1255{
1256 struct kvm_vcpu *vcpu;
1257 int r;
1258
5aacf0ca 1259 if (!valid_vcpu(kvm_run->vcpu))
6aa8b732
AK		 1260 return -EINVAL;
1261
1262 vcpu = vcpu_load(kvm, kvm_run->vcpu);
1263 if (!vcpu)
1264 return -ENOENT;
1265
1266 if (kvm_run->emulated) {
1267 kvm_arch_ops->skip_emulated_instruction(vcpu);
1268 kvm_run->emulated = 0;
1269 }
1270
1271 if (kvm_run->mmio_completed) {
1272 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1273 vcpu->mmio_read_completed = 1;
1274 }
1275
1276 vcpu->mmio_needed = 0;
1277
1278 r = kvm_arch_ops->run(vcpu, kvm_run);
1279
1280 vcpu_put(vcpu);
1281 return r;
1282}
1283
1284static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1285{
1286 struct kvm_vcpu *vcpu;
1287
5aacf0ca 1288 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1289 return -EINVAL;
1290
1291 vcpu = vcpu_load(kvm, regs->vcpu);
1292 if (!vcpu)
1293 return -ENOENT;
1294
1295 kvm_arch_ops->cache_regs(vcpu);
1296
1297 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1298 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1299 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1300 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1301 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1302 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1303 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1304 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1305#ifdef CONFIG_X86_64
6aa8b732
AK		 1306 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1307 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1308 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1309 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1310 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1311 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1312 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1313 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1314#endif
1315
1316 regs->rip = vcpu->rip;
1317 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1318
1319 /*
1320 * Don't leak debug flags in case they were set for guest debugging
1321 */
1322 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1323 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1324
1325 vcpu_put(vcpu);
1326
1327 return 0;
1328}
1329
1330static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1331{
1332 struct kvm_vcpu *vcpu;
1333
5aacf0ca 1334 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1335 return -EINVAL;
1336
1337 vcpu = vcpu_load(kvm, regs->vcpu);
1338 if (!vcpu)
1339 return -ENOENT;
1340
1341 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1342 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1343 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1344 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1345 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1346 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1347 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1348 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1349#ifdef CONFIG_X86_64
6aa8b732
AK		 1350 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1351 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1352 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1353 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1354 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1355 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1356 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1357 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1358#endif
1359
1360 vcpu->rip = regs->rip;
1361 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1362
1363 kvm_arch_ops->decache_regs(vcpu);
1364
1365 vcpu_put(vcpu);
1366
1367 return 0;
1368}
1369
1370static void get_segment(struct kvm_vcpu *vcpu,
1371 struct kvm_segment *var, int seg)
1372{
1373 return kvm_arch_ops->get_segment(vcpu, var, seg);
1374}
1375
1376static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1377{
1378 struct kvm_vcpu *vcpu;
1379 struct descriptor_table dt;
1380
5aacf0ca 1381 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1382 return -EINVAL;
1383 vcpu = vcpu_load(kvm, sregs->vcpu);
1384 if (!vcpu)
1385 return -ENOENT;
1386
1387 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1388 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1389 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1390 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1391 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1392 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1393
1394 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1395 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1396
1397 kvm_arch_ops->get_idt(vcpu, &dt);
1398 sregs->idt.limit = dt.limit;
1399 sregs->idt.base = dt.base;
1400 kvm_arch_ops->get_gdt(vcpu, &dt);
1401 sregs->gdt.limit = dt.limit;
1402 sregs->gdt.base = dt.base;
1403
1404 sregs->cr0 = vcpu->cr0;
1405 sregs->cr2 = vcpu->cr2;
1406 sregs->cr3 = vcpu->cr3;
1407 sregs->cr4 = vcpu->cr4;
1408 sregs->cr8 = vcpu->cr8;
1409 sregs->efer = vcpu->shadow_efer;
1410 sregs->apic_base = vcpu->apic_base;
1411
1412 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1413 sizeof sregs->interrupt_bitmap);
1414
1415 vcpu_put(vcpu);
1416
1417 return 0;
1418}
1419
1420static void set_segment(struct kvm_vcpu *vcpu,
1421 struct kvm_segment *var, int seg)
1422{
1423 return kvm_arch_ops->set_segment(vcpu, var, seg);
1424}
1425
1426static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1427{
1428 struct kvm_vcpu *vcpu;
1429 int mmu_reset_needed = 0;
1430 int i;
1431 struct descriptor_table dt;
1432
5aacf0ca 1433 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1434 return -EINVAL;
1435 vcpu = vcpu_load(kvm, sregs->vcpu);
1436 if (!vcpu)
1437 return -ENOENT;
1438
1439 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1440 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1441 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1442 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1443 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1444 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1445
1446 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1447 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1448
1449 dt.limit = sregs->idt.limit;
1450 dt.base = sregs->idt.base;
1451 kvm_arch_ops->set_idt(vcpu, &dt);
1452 dt.limit = sregs->gdt.limit;
1453 dt.base = sregs->gdt.base;
1454 kvm_arch_ops->set_gdt(vcpu, &dt);
1455
1456 vcpu->cr2 = sregs->cr2;
1457 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1458 vcpu->cr3 = sregs->cr3;
1459
1460 vcpu->cr8 = sregs->cr8;
1461
1462 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 1463#ifdef CONFIG_X86_64
6aa8b732
AK		 1464 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1465#endif
1466 vcpu->apic_base = sregs->apic_base;
1467
1468 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1469 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1470
1471 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1472 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1473
1474 if (mmu_reset_needed)
1475 kvm_mmu_reset_context(vcpu);
1476
1477 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1478 sizeof vcpu->irq_pending);
1479 vcpu->irq_summary = 0;
1480 for (i = 0; i < NR_IRQ_WORDS; ++i)
1481 if (vcpu->irq_pending[i])
1482 __set_bit(i, &vcpu->irq_summary);
1483
1484 vcpu_put(vcpu);
1485
1486 return 0;
1487}
1488
1489/*
1490 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1491 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 1492 *
1493 * This list is modified at module load time to reflect the
1494 * capabilities of the host cpu.
6aa8b732
AK		 1495 */
1496static u32 msrs_to_save[] = {
1497 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1498 MSR_K6_STAR,
05b3e0c2 1499#ifdef CONFIG_X86_64
6aa8b732
AK		 1500 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1501#endif
1502 MSR_IA32_TIME_STAMP_COUNTER,
1503};
1504
bf591b24
MR		 1505static unsigned num_msrs_to_save;
1506
1507static __init void kvm_init_msr_list(void)
1508{
1509 u32 dummy[2];
1510 unsigned i, j;
1511
1512 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1513 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1514 continue;
1515 if (j < i)
1516 msrs_to_save[j] = msrs_to_save[i];
1517 j++;
1518 }
1519 num_msrs_to_save = j;
1520}
6aa8b732
AK		 1521
1522/*
1523 * Adapt set_msr() to msr_io()'s calling convention
1524 */
1525static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1526{
1527 return set_msr(vcpu, index, *data);
1528}
1529
1530/*
1531 * Read or write a bunch of msrs. All parameters are kernel addresses.
1532 *
1533 * @return number of msrs set successfully.
1534 */
1535static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1536 struct kvm_msr_entry *entries,
1537 int (*do_msr)(struct kvm_vcpu *vcpu,
1538 unsigned index, u64 *data))
1539{
1540 struct kvm_vcpu *vcpu;
1541 int i;
1542
5aacf0ca 1543 if (!valid_vcpu(msrs->vcpu))
6aa8b732
AK		 1544 return -EINVAL;
1545
1546 vcpu = vcpu_load(kvm, msrs->vcpu);
1547 if (!vcpu)
1548 return -ENOENT;
1549
1550 for (i = 0; i < msrs->nmsrs; ++i)
1551 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1552 break;
1553
1554 vcpu_put(vcpu);
1555
1556 return i;
1557}
1558
1559/*
1560 * Read or write a bunch of msrs. Parameters are user addresses.
1561 *
1562 * @return number of msrs set successfully.
1563 */
1564static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1565 int (*do_msr)(struct kvm_vcpu *vcpu,
1566 unsigned index, u64 *data),
1567 int writeback)
1568{
1569 struct kvm_msrs msrs;
1570 struct kvm_msr_entry *entries;
1571 int r, n;
1572 unsigned size;
1573
1574 r = -EFAULT;
1575 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1576 goto out;
1577
1578 r = -E2BIG;
1579 if (msrs.nmsrs >= MAX_IO_MSRS)
1580 goto out;
1581
1582 r = -ENOMEM;
1583 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1584 entries = vmalloc(size);
1585 if (!entries)
1586 goto out;
1587
1588 r = -EFAULT;
1589 if (copy_from_user(entries, user_msrs->entries, size))
1590 goto out_free;
1591
1592 r = n = __msr_io(kvm, &msrs, entries, do_msr);
1593 if (r < 0)
1594 goto out_free;
1595
1596 r = -EFAULT;
1597 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1598 goto out_free;
1599
1600 r = n;
1601
1602out_free:
1603 vfree(entries);
1604out:
1605 return r;
1606}
1607
1608/*
1609 * Translate a guest virtual address to a guest physical address.
1610 */
1611static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1612{
1613 unsigned long vaddr = tr->linear_address;
1614 struct kvm_vcpu *vcpu;
1615 gpa_t gpa;
1616
1617 vcpu = vcpu_load(kvm, tr->vcpu);
1618 if (!vcpu)
1619 return -ENOENT;
1620 spin_lock(&kvm->lock);
1621 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1622 tr->physical_address = gpa;
1623 tr->valid = gpa != UNMAPPED_GVA;
1624 tr->writeable = 1;
1625 tr->usermode = 0;
1626 spin_unlock(&kvm->lock);
1627 vcpu_put(vcpu);
1628
1629 return 0;
1630}
1631
1632static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1633{
1634 struct kvm_vcpu *vcpu;
1635
5aacf0ca 1636 if (!valid_vcpu(irq->vcpu))
6aa8b732
AK		 1637 return -EINVAL;
1638 if (irq->irq < 0 || irq->irq >= 256)
1639 return -EINVAL;
1640 vcpu = vcpu_load(kvm, irq->vcpu);
1641 if (!vcpu)
1642 return -ENOENT;
1643
1644 set_bit(irq->irq, vcpu->irq_pending);
1645 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1646
1647 vcpu_put(vcpu);
1648
1649 return 0;
1650}
1651
1652static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1653 struct kvm_debug_guest *dbg)
1654{
1655 struct kvm_vcpu *vcpu;
1656 int r;
1657
5aacf0ca 1658 if (!valid_vcpu(dbg->vcpu))
6aa8b732
AK		 1659 return -EINVAL;
1660 vcpu = vcpu_load(kvm, dbg->vcpu);
1661 if (!vcpu)
1662 return -ENOENT;
1663
1664 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1665
1666 vcpu_put(vcpu);
1667
1668 return r;
1669}
1670
1671static long kvm_dev_ioctl(struct file *filp,
1672 unsigned int ioctl, unsigned long arg)
1673{
1674 struct kvm *kvm = filp->private_data;
1675 int r = -EINVAL;
1676
1677 switch (ioctl) {
0b76e20b
AK		 1678 case KVM_GET_API_VERSION:
1679 r = KVM_API_VERSION;
1680 break;
6aa8b732
AK		 1681 case KVM_CREATE_VCPU: {
1682 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1683 if (r)
1684 goto out;
1685 break;
1686 }
1687 case KVM_RUN: {
1688 struct kvm_run kvm_run;
1689
1690 r = -EFAULT;
1691 if (copy_from_user(&kvm_run, (void *)arg, sizeof kvm_run))
1692 goto out;
1693 r = kvm_dev_ioctl_run(kvm, &kvm_run);
1694 if (r < 0)
1695 goto out;
1696 r = -EFAULT;
1697 if (copy_to_user((void *)arg, &kvm_run, sizeof kvm_run))
1698 goto out;
1699 r = 0;
1700 break;
1701 }
1702 case KVM_GET_REGS: {
1703 struct kvm_regs kvm_regs;
1704
1705 r = -EFAULT;
1706 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1707 goto out;
1708 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
1709 if (r)
1710 goto out;
1711 r = -EFAULT;
1712 if (copy_to_user((void *)arg, &kvm_regs, sizeof kvm_regs))
1713 goto out;
1714 r = 0;
1715 break;
1716 }
1717 case KVM_SET_REGS: {
1718 struct kvm_regs kvm_regs;
1719
1720 r = -EFAULT;
1721 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1722 goto out;
1723 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
1724 if (r)
1725 goto out;
1726 r = 0;
1727 break;
1728 }
1729 case KVM_GET_SREGS: {
1730 struct kvm_sregs kvm_sregs;
1731
1732 r = -EFAULT;
1733 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1734 goto out;
1735 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
1736 if (r)
1737 goto out;
1738 r = -EFAULT;
1739 if (copy_to_user((void *)arg, &kvm_sregs, sizeof kvm_sregs))
1740 goto out;
1741 r = 0;
1742 break;
1743 }
1744 case KVM_SET_SREGS: {
1745 struct kvm_sregs kvm_sregs;
1746
1747 r = -EFAULT;
1748 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1749 goto out;
1750 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
1751 if (r)
1752 goto out;
1753 r = 0;
1754 break;
1755 }
1756 case KVM_TRANSLATE: {
1757 struct kvm_translation tr;
1758
1759 r = -EFAULT;
1760 if (copy_from_user(&tr, (void *)arg, sizeof tr))
1761 goto out;
1762 r = kvm_dev_ioctl_translate(kvm, &tr);
1763 if (r)
1764 goto out;
1765 r = -EFAULT;
1766 if (copy_to_user((void *)arg, &tr, sizeof tr))
1767 goto out;
1768 r = 0;
1769 break;
1770 }
1771 case KVM_INTERRUPT: {
1772 struct kvm_interrupt irq;
1773
1774 r = -EFAULT;
1775 if (copy_from_user(&irq, (void *)arg, sizeof irq))
1776 goto out;
1777 r = kvm_dev_ioctl_interrupt(kvm, &irq);
1778 if (r)
1779 goto out;
1780 r = 0;
1781 break;
1782 }
1783 case KVM_DEBUG_GUEST: {
1784 struct kvm_debug_guest dbg;
1785
1786 r = -EFAULT;
1787 if (copy_from_user(&dbg, (void *)arg, sizeof dbg))
1788 goto out;
1789 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
1790 if (r)
1791 goto out;
1792 r = 0;
1793 break;
1794 }
1795 case KVM_SET_MEMORY_REGION: {
1796 struct kvm_memory_region kvm_mem;
1797
1798 r = -EFAULT;
1799 if (copy_from_user(&kvm_mem, (void *)arg, sizeof kvm_mem))
1800 goto out;
1801 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
1802 if (r)
1803 goto out;
1804 break;
1805 }
1806 case KVM_GET_DIRTY_LOG: {
1807 struct kvm_dirty_log log;
1808
1809 r = -EFAULT;
1810 if (copy_from_user(&log, (void *)arg, sizeof log))
1811 goto out;
1812 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
1813 if (r)
1814 goto out;
1815 break;
1816 }
1817 case KVM_GET_MSRS:
1818 r = msr_io(kvm, (void __user *)arg, get_msr, 1);
1819 break;
1820 case KVM_SET_MSRS:
1821 r = msr_io(kvm, (void __user *)arg, do_set_msr, 0);
1822 break;
1823 case KVM_GET_MSR_INDEX_LIST: {
1824 struct kvm_msr_list __user *user_msr_list = (void __user *)arg;
1825 struct kvm_msr_list msr_list;
1826 unsigned n;
1827
1828 r = -EFAULT;
1829 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1830 goto out;
1831 n = msr_list.nmsrs;
bf591b24 1832 msr_list.nmsrs = num_msrs_to_save;
6aa8b732
AK		 1833 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1834 goto out;
1835 r = -E2BIG;
bf591b24 1836 if (n < num_msrs_to_save)
6aa8b732
AK		 1837 goto out;
1838 r = -EFAULT;
1839 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 1840 num_msrs_to_save * sizeof(u32)))
6aa8b732
AK		 1841 goto out;
1842 r = 0;
1843 }
1844 default:
1845 ;
1846 }
1847out:
1848 return r;
1849}
1850
1851static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
1852 unsigned long address,
1853 int *type)
1854{
1855 struct kvm *kvm = vma->vm_file->private_data;
1856 unsigned long pgoff;
1857 struct kvm_memory_slot *slot;
1858 struct page *page;
1859
1860 *type = VM_FAULT_MINOR;
1861 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1862 slot = gfn_to_memslot(kvm, pgoff);
1863 if (!slot)
1864 return NOPAGE_SIGBUS;
1865 page = gfn_to_page(slot, pgoff);
1866 if (!page)
1867 return NOPAGE_SIGBUS;
1868 get_page(page);
1869 return page;
1870}
1871
1872static struct vm_operations_struct kvm_dev_vm_ops = {
1873 .nopage = kvm_dev_nopage,
1874};
1875
1876static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
1877{
1878 vma->vm_ops = &kvm_dev_vm_ops;
1879 return 0;
1880}
1881
1882static struct file_operations kvm_chardev_ops = {
1883 .open = kvm_dev_open,
1884 .release = kvm_dev_release,
1885 .unlocked_ioctl = kvm_dev_ioctl,
1886 .compat_ioctl = kvm_dev_ioctl,
1887 .mmap = kvm_dev_mmap,
1888};
1889
1890static struct miscdevice kvm_dev = {
1891 MISC_DYNAMIC_MINOR,
1892 "kvm",
1893 &kvm_chardev_ops,
1894};
1895
1896static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1897 void *v)
1898{
1899 if (val == SYS_RESTART) {
1900 /*
1901 * Some (well, at least mine) BIOSes hang on reboot if
1902 * in vmx root mode.
1903 */
1904 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1905 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1906 }
1907 return NOTIFY_OK;
1908}
1909
1910static struct notifier_block kvm_reboot_notifier = {
1911 .notifier_call = kvm_reboot,
1912 .priority = 0,
1913};
1914
1915static __init void kvm_init_debug(void)
1916{
1917 struct kvm_stats_debugfs_item *p;
1918
1919 debugfs_dir = debugfs_create_dir("kvm", 0);
1920 for (p = debugfs_entries; p->name; ++p)
1921 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
1922 p->data);
1923}
1924
1925static void kvm_exit_debug(void)
1926{
1927 struct kvm_stats_debugfs_item *p;
1928
1929 for (p = debugfs_entries; p->name; ++p)
1930 debugfs_remove(p->dentry);
1931 debugfs_remove(debugfs_dir);
1932}
1933
1934hpa_t bad_page_address;
1935
1936int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
1937{
1938 int r;
1939
09db28b8
YI		 1940 if (kvm_arch_ops) {
1941 printk(KERN_ERR "kvm: already loaded the other module\n");
1942 return -EEXIST;
1943 }
1944
6aa8b732
AK		 1945 kvm_arch_ops = ops;
1946
1947 if (!kvm_arch_ops->cpu_has_kvm_support()) {
1948 printk(KERN_ERR "kvm: no hardware support\n");
1949 return -EOPNOTSUPP;
1950 }
1951 if (kvm_arch_ops->disabled_by_bios()) {
1952 printk(KERN_ERR "kvm: disabled by bios\n");
1953 return -EOPNOTSUPP;
1954 }
1955
1956 r = kvm_arch_ops->hardware_setup();
1957 if (r < 0)
1958 return r;
1959
1960 on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1);
1961 register_reboot_notifier(&kvm_reboot_notifier);
1962
1963 kvm_chardev_ops.owner = module;
1964
1965 r = misc_register(&kvm_dev);
1966 if (r) {
1967 printk (KERN_ERR "kvm: misc device register failed\n");
1968 goto out_free;
1969 }
1970
1971 return r;
1972
1973out_free:
1974 unregister_reboot_notifier(&kvm_reboot_notifier);
1975 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1976 kvm_arch_ops->hardware_unsetup();
1977 return r;
1978}
1979
1980void kvm_exit_arch(void)
1981{
1982 misc_deregister(&kvm_dev);
1983
1984 unregister_reboot_notifier(&kvm_reboot_notifier);
1985 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1986 kvm_arch_ops->hardware_unsetup();
09db28b8 1987 kvm_arch_ops = NULL;
6aa8b732
AK		 1988}
1989
1990static __init int kvm_init(void)
1991{
1992 static struct page *bad_page;
1993 int r = 0;
1994
1995 kvm_init_debug();
1996
bf591b24
MR		 1997 kvm_init_msr_list();
1998
6aa8b732
AK		 1999 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2000 r = -ENOMEM;
2001 goto out;
2002 }
2003
2004 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2005 memset(__va(bad_page_address), 0, PAGE_SIZE);
2006
2007 return r;
2008
2009out:
2010 kvm_exit_debug();
2011 return r;
2012}
2013
2014static __exit void kvm_exit(void)
2015{
2016 kvm_exit_debug();
2017 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
2018}
2019
2020module_init(kvm_init)
2021module_exit(kvm_exit)
2022
2023EXPORT_SYMBOL_GPL(kvm_init_arch);
2024EXPORT_SYMBOL_GPL(kvm_exit_arch);
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git