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[PATCH] Update the rtc-rs5c372 driver
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / kvm / kvm_main.c
CommitLineData
6aa8b732
AK		 1/*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
8 *
9 * Authors:
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
12 *
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
15 *
16 */
17
18#include "kvm.h"
19
20#include <linux/kvm.h>
21#include <linux/module.h>
22#include <linux/errno.h>
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 },
c1150d8c
DL		 61 { "irq_window", &kvm_stat.irq_window_exits },
62 { "halt_exits", &kvm_stat.halt_exits },
63 { "request_irq", &kvm_stat.request_irq_exits },
6aa8b732
AK		 64 { "irq_exits", &kvm_stat.irq_exits },
65 { 0, 0 }
66};
67
68static struct dentry *debugfs_dir;
69
70#define MAX_IO_MSRS 256
71
72#define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
73#define LMSW_GUEST_MASK 0x0eULL
74#define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
75#define CR8_RESEVED_BITS (~0x0fULL)
76#define EFER_RESERVED_BITS 0xfffffffffffff2fe
77
05b3e0c2 78#ifdef CONFIG_X86_64
6aa8b732
AK		 79// LDT or TSS descriptor in the GDT. 16 bytes.
80struct segment_descriptor_64 {
81 struct segment_descriptor s;
82 u32 base_higher;
83 u32 pad_zero;
84};
85
86#endif
87
88unsigned long segment_base(u16 selector)
89{
90 struct descriptor_table gdt;
91 struct segment_descriptor *d;
92 unsigned long table_base;
93 typedef unsigned long ul;
94 unsigned long v;
95
96 if (selector == 0)
97 return 0;
98
99 asm ("sgdt %0" : "=m"(gdt));
100 table_base = gdt.base;
101
102 if (selector & 4) { /* from ldt */
103 u16 ldt_selector;
104
105 asm ("sldt %0" : "=g"(ldt_selector));
106 table_base = segment_base(ldt_selector);
107 }
108 d = (struct segment_descriptor *)(table_base + (selector & ~7));
109 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
05b3e0c2 110#ifdef CONFIG_X86_64
6aa8b732
AK		 111 if (d->system == 0
112 && (d->type == 2 || d->type == 9 || d->type == 11))
113 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
114#endif
115 return v;
116}
117EXPORT_SYMBOL_GPL(segment_base);
118
5aacf0ca
JM		 119static inline int valid_vcpu(int n)
120{
121 return likely(n >= 0 && n < KVM_MAX_VCPUS);
122}
123
6aa8b732
AK		 124int kvm_read_guest(struct kvm_vcpu *vcpu,
125 gva_t addr,
126 unsigned long size,
127 void *dest)
128{
129 unsigned char *host_buf = dest;
130 unsigned long req_size = size;
131
132 while (size) {
133 hpa_t paddr;
134 unsigned now;
135 unsigned offset;
136 hva_t guest_buf;
137
138 paddr = gva_to_hpa(vcpu, addr);
139
140 if (is_error_hpa(paddr))
141 break;
142
143 guest_buf = (hva_t)kmap_atomic(
144 pfn_to_page(paddr >> PAGE_SHIFT),
145 KM_USER0);
146 offset = addr & ~PAGE_MASK;
147 guest_buf |= offset;
148 now = min(size, PAGE_SIZE - offset);
149 memcpy(host_buf, (void*)guest_buf, now);
150 host_buf += now;
151 addr += now;
152 size -= now;
153 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
154 }
155 return req_size - size;
156}
157EXPORT_SYMBOL_GPL(kvm_read_guest);
158
159int kvm_write_guest(struct kvm_vcpu *vcpu,
160 gva_t addr,
161 unsigned long size,
162 void *data)
163{
164 unsigned char *host_buf = data;
165 unsigned long req_size = size;
166
167 while (size) {
168 hpa_t paddr;
169 unsigned now;
170 unsigned offset;
171 hva_t guest_buf;
172
173 paddr = gva_to_hpa(vcpu, addr);
174
175 if (is_error_hpa(paddr))
176 break;
177
178 guest_buf = (hva_t)kmap_atomic(
179 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
180 offset = addr & ~PAGE_MASK;
181 guest_buf |= offset;
182 now = min(size, PAGE_SIZE - offset);
183 memcpy((void*)guest_buf, host_buf, now);
184 host_buf += now;
185 addr += now;
186 size -= now;
187 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
188 }
189 return req_size - size;
190}
191EXPORT_SYMBOL_GPL(kvm_write_guest);
192
193static int vcpu_slot(struct kvm_vcpu *vcpu)
194{
195 return vcpu - vcpu->kvm->vcpus;
196}
197
198/*
199 * Switches to specified vcpu, until a matching vcpu_put()
200 */
201static struct kvm_vcpu *vcpu_load(struct kvm *kvm, int vcpu_slot)
202{
203 struct kvm_vcpu *vcpu = &kvm->vcpus[vcpu_slot];
204
205 mutex_lock(&vcpu->mutex);
206 if (unlikely(!vcpu->vmcs)) {
207 mutex_unlock(&vcpu->mutex);
208 return 0;
209 }
210 return kvm_arch_ops->vcpu_load(vcpu);
211}
212
213static void vcpu_put(struct kvm_vcpu *vcpu)
214{
215 kvm_arch_ops->vcpu_put(vcpu);
6aa8b732
AK		 216 mutex_unlock(&vcpu->mutex);
217}
218
219static int kvm_dev_open(struct inode *inode, struct file *filp)
220{
221 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
222 int i;
223
224 if (!kvm)
225 return -ENOMEM;
226
227 spin_lock_init(&kvm->lock);
228 INIT_LIST_HEAD(&kvm->active_mmu_pages);
229 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
230 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
231
232 mutex_init(&vcpu->mutex);
233 vcpu->mmu.root_hpa = INVALID_PAGE;
234 INIT_LIST_HEAD(&vcpu->free_pages);
235 }
236 filp->private_data = kvm;
237 return 0;
238}
239
240/*
241 * Free any memory in @free but not in @dont.
242 */
243static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
244 struct kvm_memory_slot *dont)
245{
246 int i;
247
248 if (!dont || free->phys_mem != dont->phys_mem)
249 if (free->phys_mem) {
250 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 251 if (free->phys_mem[i])
252 __free_page(free->phys_mem[i]);
6aa8b732
AK		 253 vfree(free->phys_mem);
254 }
255
256 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
257 vfree(free->dirty_bitmap);
258
259 free->phys_mem = 0;
260 free->npages = 0;
261 free->dirty_bitmap = 0;
262}
263
264static void kvm_free_physmem(struct kvm *kvm)
265{
266 int i;
267
268 for (i = 0; i < kvm->nmemslots; ++i)
269 kvm_free_physmem_slot(&kvm->memslots[i], 0);
270}
271
272static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
273{
274 kvm_arch_ops->vcpu_free(vcpu);
275 kvm_mmu_destroy(vcpu);
276}
277
278static void kvm_free_vcpus(struct kvm *kvm)
279{
280 unsigned int i;
281
282 for (i = 0; i < KVM_MAX_VCPUS; ++i)
283 kvm_free_vcpu(&kvm->vcpus[i]);
284}
285
286static int kvm_dev_release(struct inode *inode, struct file *filp)
287{
288 struct kvm *kvm = filp->private_data;
289
290 kvm_free_vcpus(kvm);
291 kvm_free_physmem(kvm);
292 kfree(kvm);
293 return 0;
294}
295
296static void inject_gp(struct kvm_vcpu *vcpu)
297{
298 kvm_arch_ops->inject_gp(vcpu, 0);
299}
300
301static int pdptrs_have_reserved_bits_set(struct kvm_vcpu *vcpu,
302 unsigned long cr3)
303{
304 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
305 unsigned offset = (cr3 & (PAGE_SIZE-1)) >> 5;
306 int i;
307 u64 pdpte;
308 u64 *pdpt;
309 struct kvm_memory_slot *memslot;
310
311 spin_lock(&vcpu->kvm->lock);
312 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
313 /* FIXME: !memslot - emulate? 0xff? */
314 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
315
316 for (i = 0; i < 4; ++i) {
317 pdpte = pdpt[offset + i];
318 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull))
319 break;
320 }
321
322 kunmap_atomic(pdpt, KM_USER0);
323 spin_unlock(&vcpu->kvm->lock);
324
325 return i != 4;
326}
327
328void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
329{
330 if (cr0 & CR0_RESEVED_BITS) {
331 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
332 cr0, vcpu->cr0);
333 inject_gp(vcpu);
334 return;
335 }
336
337 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
338 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
339 inject_gp(vcpu);
340 return;
341 }
342
343 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
344 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
345 "and a clear PE flag\n");
346 inject_gp(vcpu);
347 return;
348 }
349
350 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 351#ifdef CONFIG_X86_64
6aa8b732
AK		 352 if ((vcpu->shadow_efer & EFER_LME)) {
353 int cs_db, cs_l;
354
355 if (!is_pae(vcpu)) {
356 printk(KERN_DEBUG "set_cr0: #GP, start paging "
357 "in long mode while PAE is disabled\n");
358 inject_gp(vcpu);
359 return;
360 }
361 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
362 if (cs_l) {
363 printk(KERN_DEBUG "set_cr0: #GP, start paging "
364 "in long mode while CS.L == 1\n");
365 inject_gp(vcpu);
366 return;
367
368 }
369 } else
370#endif
371 if (is_pae(vcpu) &&
372 pdptrs_have_reserved_bits_set(vcpu, vcpu->cr3)) {
373 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
374 "reserved bits\n");
375 inject_gp(vcpu);
376 return;
377 }
378
379 }
380
381 kvm_arch_ops->set_cr0(vcpu, cr0);
382 vcpu->cr0 = cr0;
383
384 spin_lock(&vcpu->kvm->lock);
385 kvm_mmu_reset_context(vcpu);
386 spin_unlock(&vcpu->kvm->lock);
387 return;
388}
389EXPORT_SYMBOL_GPL(set_cr0);
390
391void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
392{
393 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
394}
395EXPORT_SYMBOL_GPL(lmsw);
396
397void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
398{
399 if (cr4 & CR4_RESEVED_BITS) {
400 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
401 inject_gp(vcpu);
402 return;
403 }
404
a9058ecd 405 if (is_long_mode(vcpu)) {
6aa8b732
AK		 406 if (!(cr4 & CR4_PAE_MASK)) {
407 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
408 "in long mode\n");
409 inject_gp(vcpu);
410 return;
411 }
412 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
413 && pdptrs_have_reserved_bits_set(vcpu, vcpu->cr3)) {
414 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
415 inject_gp(vcpu);
416 }
417
418 if (cr4 & CR4_VMXE_MASK) {
419 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
420 inject_gp(vcpu);
421 return;
422 }
423 kvm_arch_ops->set_cr4(vcpu, cr4);
424 spin_lock(&vcpu->kvm->lock);
425 kvm_mmu_reset_context(vcpu);
426 spin_unlock(&vcpu->kvm->lock);
427}
428EXPORT_SYMBOL_GPL(set_cr4);
429
430void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
431{
a9058ecd 432 if (is_long_mode(vcpu)) {
6aa8b732
AK		 433 if ( cr3 & CR3_L_MODE_RESEVED_BITS) {
434 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
435 inject_gp(vcpu);
436 return;
437 }
438 } else {
439 if (cr3 & CR3_RESEVED_BITS) {
440 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
441 inject_gp(vcpu);
442 return;
443 }
444 if (is_paging(vcpu) && is_pae(vcpu) &&
445 pdptrs_have_reserved_bits_set(vcpu, cr3)) {
446 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
447 "reserved bits\n");
448 inject_gp(vcpu);
449 return;
450 }
451 }
452
453 vcpu->cr3 = cr3;
454 spin_lock(&vcpu->kvm->lock);
455 vcpu->mmu.new_cr3(vcpu);
456 spin_unlock(&vcpu->kvm->lock);
457}
458EXPORT_SYMBOL_GPL(set_cr3);
459
460void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
461{
462 if ( cr8 & CR8_RESEVED_BITS) {
463 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
464 inject_gp(vcpu);
465 return;
466 }
467 vcpu->cr8 = cr8;
468}
469EXPORT_SYMBOL_GPL(set_cr8);
470
471void fx_init(struct kvm_vcpu *vcpu)
472{
473 struct __attribute__ ((__packed__)) fx_image_s {
474 u16 control; //fcw
475 u16 status; //fsw
476 u16 tag; // ftw
477 u16 opcode; //fop
478 u64 ip; // fpu ip
479 u64 operand;// fpu dp
480 u32 mxcsr;
481 u32 mxcsr_mask;
482
483 } *fx_image;
484
485 fx_save(vcpu->host_fx_image);
486 fpu_init();
487 fx_save(vcpu->guest_fx_image);
488 fx_restore(vcpu->host_fx_image);
489
490 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
491 fx_image->mxcsr = 0x1f80;
492 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
493 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
494}
495EXPORT_SYMBOL_GPL(fx_init);
496
497/*
498 * Creates some virtual cpus. Good luck creating more than one.
499 */
500static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
501{
502 int r;
503 struct kvm_vcpu *vcpu;
504
505 r = -EINVAL;
5aacf0ca 506 if (!valid_vcpu(n))
6aa8b732
AK		 507 goto out;
508
509 vcpu = &kvm->vcpus[n];
510
511 mutex_lock(&vcpu->mutex);
512
513 if (vcpu->vmcs) {
514 mutex_unlock(&vcpu->mutex);
515 return -EEXIST;
516 }
517
518 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
519 FX_IMAGE_ALIGN);
520 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
521
522 vcpu->cpu = -1; /* First load will set up TR */
523 vcpu->kvm = kvm;
524 r = kvm_arch_ops->vcpu_create(vcpu);
525 if (r < 0)
526 goto out_free_vcpus;
527
8018c27b
IM		 528 r = kvm_mmu_create(vcpu);
529 if (r < 0)
530 goto out_free_vcpus;
6aa8b732 531
8018c27b
IM		 532 kvm_arch_ops->vcpu_load(vcpu);
533 r = kvm_mmu_setup(vcpu);
6aa8b732 534 if (r >= 0)
8018c27b 535 r = kvm_arch_ops->vcpu_setup(vcpu);
6aa8b732
AK		 536 vcpu_put(vcpu);
537
538 if (r < 0)
539 goto out_free_vcpus;
540
541 return 0;
542
543out_free_vcpus:
544 kvm_free_vcpu(vcpu);
545 mutex_unlock(&vcpu->mutex);
546out:
547 return r;
548}
549
550/*
551 * Allocate some memory and give it an address in the guest physical address
552 * space.
553 *
554 * Discontiguous memory is allowed, mostly for framebuffers.
555 */
556static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm,
557 struct kvm_memory_region *mem)
558{
559 int r;
560 gfn_t base_gfn;
561 unsigned long npages;
562 unsigned long i;
563 struct kvm_memory_slot *memslot;
564 struct kvm_memory_slot old, new;
565 int memory_config_version;
566
567 r = -EINVAL;
568 /* General sanity checks */
569 if (mem->memory_size & (PAGE_SIZE - 1))
570 goto out;
571 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
572 goto out;
573 if (mem->slot >= KVM_MEMORY_SLOTS)
574 goto out;
575 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
576 goto out;
577
578 memslot = &kvm->memslots[mem->slot];
579 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
580 npages = mem->memory_size >> PAGE_SHIFT;
581
582 if (!npages)
583 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
584
585raced:
586 spin_lock(&kvm->lock);
587
588 memory_config_version = kvm->memory_config_version;
589 new = old = *memslot;
590
591 new.base_gfn = base_gfn;
592 new.npages = npages;
593 new.flags = mem->flags;
594
595 /* Disallow changing a memory slot's size. */
596 r = -EINVAL;
597 if (npages && old.npages && npages != old.npages)
598 goto out_unlock;
599
600 /* Check for overlaps */
601 r = -EEXIST;
602 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
603 struct kvm_memory_slot *s = &kvm->memslots[i];
604
605 if (s == memslot)
606 continue;
607 if (!((base_gfn + npages <= s->base_gfn) ||
608 (base_gfn >= s->base_gfn + s->npages)))
609 goto out_unlock;
610 }
611 /*
612 * Do memory allocations outside lock. memory_config_version will
613 * detect any races.
614 */
615 spin_unlock(&kvm->lock);
616
617 /* Deallocate if slot is being removed */
618 if (!npages)
619 new.phys_mem = 0;
620
621 /* Free page dirty bitmap if unneeded */
622 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
623 new.dirty_bitmap = 0;
624
625 r = -ENOMEM;
626
627 /* Allocate if a slot is being created */
628 if (npages && !new.phys_mem) {
629 new.phys_mem = vmalloc(npages * sizeof(struct page *));
630
631 if (!new.phys_mem)
632 goto out_free;
633
634 memset(new.phys_mem, 0, npages * sizeof(struct page *));
635 for (i = 0; i < npages; ++i) {
636 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
637 | __GFP_ZERO);
638 if (!new.phys_mem[i])
639 goto out_free;
640 }
641 }
642
643 /* Allocate page dirty bitmap if needed */
644 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
645 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
646
647 new.dirty_bitmap = vmalloc(dirty_bytes);
648 if (!new.dirty_bitmap)
649 goto out_free;
650 memset(new.dirty_bitmap, 0, dirty_bytes);
651 }
652
653 spin_lock(&kvm->lock);
654
655 if (memory_config_version != kvm->memory_config_version) {
656 spin_unlock(&kvm->lock);
657 kvm_free_physmem_slot(&new, &old);
658 goto raced;
659 }
660
661 r = -EAGAIN;
662 if (kvm->busy)
663 goto out_unlock;
664
665 if (mem->slot >= kvm->nmemslots)
666 kvm->nmemslots = mem->slot + 1;
667
668 *memslot = new;
669 ++kvm->memory_config_version;
670
671 spin_unlock(&kvm->lock);
672
673 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
674 struct kvm_vcpu *vcpu;
675
676 vcpu = vcpu_load(kvm, i);
677 if (!vcpu)
678 continue;
679 kvm_mmu_reset_context(vcpu);
680 vcpu_put(vcpu);
681 }
682
683 kvm_free_physmem_slot(&old, &new);
684 return 0;
685
686out_unlock:
687 spin_unlock(&kvm->lock);
688out_free:
689 kvm_free_physmem_slot(&new, &old);
690out:
691 return r;
692}
693
694/*
695 * Get (and clear) the dirty memory log for a memory slot.
696 */
697static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
698 struct kvm_dirty_log *log)
699{
700 struct kvm_memory_slot *memslot;
701 int r, i;
702 int n;
703 unsigned long any = 0;
704
705 spin_lock(&kvm->lock);
706
707 /*
708 * Prevent changes to guest memory configuration even while the lock
709 * is not taken.
710 */
711 ++kvm->busy;
712 spin_unlock(&kvm->lock);
713 r = -EINVAL;
714 if (log->slot >= KVM_MEMORY_SLOTS)
715 goto out;
716
717 memslot = &kvm->memslots[log->slot];
718 r = -ENOENT;
719 if (!memslot->dirty_bitmap)
720 goto out;
721
722 n = ALIGN(memslot->npages, 8) / 8;
723
724 for (i = 0; !any && i < n; ++i)
725 any = memslot->dirty_bitmap[i];
726
727 r = -EFAULT;
728 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
729 goto out;
730
731
732 if (any) {
733 spin_lock(&kvm->lock);
734 kvm_mmu_slot_remove_write_access(kvm, log->slot);
735 spin_unlock(&kvm->lock);
736 memset(memslot->dirty_bitmap, 0, n);
737 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
738 struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
739
740 if (!vcpu)
741 continue;
742 kvm_arch_ops->tlb_flush(vcpu);
743 vcpu_put(vcpu);
744 }
745 }
746
747 r = 0;
748
749out:
750 spin_lock(&kvm->lock);
751 --kvm->busy;
752 spin_unlock(&kvm->lock);
753 return r;
754}
755
756struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
757{
758 int i;
759
760 for (i = 0; i < kvm->nmemslots; ++i) {
761 struct kvm_memory_slot *memslot = &kvm->memslots[i];
762
763 if (gfn >= memslot->base_gfn
764 && gfn < memslot->base_gfn + memslot->npages)
765 return memslot;
766 }
767 return 0;
768}
769EXPORT_SYMBOL_GPL(gfn_to_memslot);
770
771void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
772{
773 int i;
774 struct kvm_memory_slot *memslot = 0;
775 unsigned long rel_gfn;
776
777 for (i = 0; i < kvm->nmemslots; ++i) {
778 memslot = &kvm->memslots[i];
779
780 if (gfn >= memslot->base_gfn
781 && gfn < memslot->base_gfn + memslot->npages) {
782
783 if (!memslot || !memslot->dirty_bitmap)
784 return;
785
786 rel_gfn = gfn - memslot->base_gfn;
787
788 /* avoid RMW */
789 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
790 set_bit(rel_gfn, memslot->dirty_bitmap);
791 return;
792 }
793 }
794}
795
796static int emulator_read_std(unsigned long addr,
797 unsigned long *val,
798 unsigned int bytes,
799 struct x86_emulate_ctxt *ctxt)
800{
801 struct kvm_vcpu *vcpu = ctxt->vcpu;
802 void *data = val;
803
804 while (bytes) {
805 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
806 unsigned offset = addr & (PAGE_SIZE-1);
807 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
808 unsigned long pfn;
809 struct kvm_memory_slot *memslot;
810 void *page;
811
812 if (gpa == UNMAPPED_GVA)
813 return X86EMUL_PROPAGATE_FAULT;
814 pfn = gpa >> PAGE_SHIFT;
815 memslot = gfn_to_memslot(vcpu->kvm, pfn);
816 if (!memslot)
817 return X86EMUL_UNHANDLEABLE;
818 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
819
820 memcpy(data, page + offset, tocopy);
821
822 kunmap_atomic(page, KM_USER0);
823
824 bytes -= tocopy;
825 data += tocopy;
826 addr += tocopy;
827 }
828
829 return X86EMUL_CONTINUE;
830}
831
832static int emulator_write_std(unsigned long addr,
833 unsigned long val,
834 unsigned int bytes,
835 struct x86_emulate_ctxt *ctxt)
836{
837 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
838 addr, bytes);
839 return X86EMUL_UNHANDLEABLE;
840}
841
842static int emulator_read_emulated(unsigned long addr,
843 unsigned long *val,
844 unsigned int bytes,
845 struct x86_emulate_ctxt *ctxt)
846{
847 struct kvm_vcpu *vcpu = ctxt->vcpu;
848
849 if (vcpu->mmio_read_completed) {
850 memcpy(val, vcpu->mmio_data, bytes);
851 vcpu->mmio_read_completed = 0;
852 return X86EMUL_CONTINUE;
853 } else if (emulator_read_std(addr, val, bytes, ctxt)
854 == X86EMUL_CONTINUE)
855 return X86EMUL_CONTINUE;
856 else {
857 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
858 if (gpa == UNMAPPED_GVA)
859 return vcpu_printf(vcpu, "not present\n"), X86EMUL_PROPAGATE_FAULT;
860 vcpu->mmio_needed = 1;
861 vcpu->mmio_phys_addr = gpa;
862 vcpu->mmio_size = bytes;
863 vcpu->mmio_is_write = 0;
864
865 return X86EMUL_UNHANDLEABLE;
866 }
867}
868
869static int emulator_write_emulated(unsigned long addr,
870 unsigned long val,
871 unsigned int bytes,
872 struct x86_emulate_ctxt *ctxt)
873{
874 struct kvm_vcpu *vcpu = ctxt->vcpu;
875 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
876
877 if (gpa == UNMAPPED_GVA)
878 return X86EMUL_PROPAGATE_FAULT;
879
880 vcpu->mmio_needed = 1;
881 vcpu->mmio_phys_addr = gpa;
882 vcpu->mmio_size = bytes;
883 vcpu->mmio_is_write = 1;
884 memcpy(vcpu->mmio_data, &val, bytes);
885
886 return X86EMUL_CONTINUE;
887}
888
889static int emulator_cmpxchg_emulated(unsigned long addr,
890 unsigned long old,
891 unsigned long new,
892 unsigned int bytes,
893 struct x86_emulate_ctxt *ctxt)
894{
895 static int reported;
896
897 if (!reported) {
898 reported = 1;
899 printk(KERN_WARNING "kvm: emulating exchange as write\n");
900 }
901 return emulator_write_emulated(addr, new, bytes, ctxt);
902}
903
904static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
905{
906 return kvm_arch_ops->get_segment_base(vcpu, seg);
907}
908
909int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
910{
911 spin_lock(&vcpu->kvm->lock);
912 vcpu->mmu.inval_page(vcpu, address);
913 spin_unlock(&vcpu->kvm->lock);
914 kvm_arch_ops->invlpg(vcpu, address);
915 return X86EMUL_CONTINUE;
916}
917
918int emulate_clts(struct kvm_vcpu *vcpu)
919{
920 unsigned long cr0 = vcpu->cr0;
921
922 cr0 &= ~CR0_TS_MASK;
923 kvm_arch_ops->set_cr0(vcpu, cr0);
924 return X86EMUL_CONTINUE;
925}
926
927int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
928{
929 struct kvm_vcpu *vcpu = ctxt->vcpu;
930
931 switch (dr) {
932 case 0 ... 3:
933 *dest = kvm_arch_ops->get_dr(vcpu, dr);
934 return X86EMUL_CONTINUE;
935 default:
936 printk(KERN_DEBUG "%s: unexpected dr %u\n",
937 __FUNCTION__, dr);
938 return X86EMUL_UNHANDLEABLE;
939 }
940}
941
942int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
943{
944 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
945 int exception;
946
947 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
948 if (exception) {
949 /* FIXME: better handling */
950 return X86EMUL_UNHANDLEABLE;
951 }
952 return X86EMUL_CONTINUE;
953}
954
955static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
956{
957 static int reported;
958 u8 opcodes[4];
959 unsigned long rip = ctxt->vcpu->rip;
960 unsigned long rip_linear;
961
962 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
963
964 if (reported)
965 return;
966
967 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
968
969 printk(KERN_ERR "emulation failed but !mmio_needed?"
970 " rip %lx %02x %02x %02x %02x\n",
971 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
972 reported = 1;
973}
974
975struct x86_emulate_ops emulate_ops = {
976 .read_std = emulator_read_std,
977 .write_std = emulator_write_std,
978 .read_emulated = emulator_read_emulated,
979 .write_emulated = emulator_write_emulated,
980 .cmpxchg_emulated = emulator_cmpxchg_emulated,
981};
982
983int emulate_instruction(struct kvm_vcpu *vcpu,
984 struct kvm_run *run,
985 unsigned long cr2,
986 u16 error_code)
987{
988 struct x86_emulate_ctxt emulate_ctxt;
989 int r;
990 int cs_db, cs_l;
991
992 kvm_arch_ops->cache_regs(vcpu);
993
994 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
995
996 emulate_ctxt.vcpu = vcpu;
997 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
998 emulate_ctxt.cr2 = cr2;
999 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1000 ? X86EMUL_MODE_REAL : cs_l
1001 ? X86EMUL_MODE_PROT64 : cs_db
1002 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1003
1004 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1005 emulate_ctxt.cs_base = 0;
1006 emulate_ctxt.ds_base = 0;
1007 emulate_ctxt.es_base = 0;
1008 emulate_ctxt.ss_base = 0;
1009 } else {
1010 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1011 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1012 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1013 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1014 }
1015
1016 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1017 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1018
1019 vcpu->mmio_is_write = 0;
1020 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1021
1022 if ((r || vcpu->mmio_is_write) && run) {
1023 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1024 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1025 run->mmio.len = vcpu->mmio_size;
1026 run->mmio.is_write = vcpu->mmio_is_write;
1027 }
1028
1029 if (r) {
1030 if (!vcpu->mmio_needed) {
1031 report_emulation_failure(&emulate_ctxt);
1032 return EMULATE_FAIL;
1033 }
1034 return EMULATE_DO_MMIO;
1035 }
1036
1037 kvm_arch_ops->decache_regs(vcpu);
1038 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1039
1040 if (vcpu->mmio_is_write)
1041 return EMULATE_DO_MMIO;
1042
1043 return EMULATE_DONE;
1044}
1045EXPORT_SYMBOL_GPL(emulate_instruction);
1046
1047static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1048{
1049 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1050}
1051
1052void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1053{
1054 struct descriptor_table dt = { limit, base };
1055
1056 kvm_arch_ops->set_gdt(vcpu, &dt);
1057}
1058
1059void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1060{
1061 struct descriptor_table dt = { limit, base };
1062
1063 kvm_arch_ops->set_idt(vcpu, &dt);
1064}
1065
1066void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1067 unsigned long *rflags)
1068{
1069 lmsw(vcpu, msw);
1070 *rflags = kvm_arch_ops->get_rflags(vcpu);
1071}
1072
1073unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1074{
1075 switch (cr) {
1076 case 0:
1077 return vcpu->cr0;
1078 case 2:
1079 return vcpu->cr2;
1080 case 3:
1081 return vcpu->cr3;
1082 case 4:
1083 return vcpu->cr4;
1084 default:
1085 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1086 return 0;
1087 }
1088}
1089
1090void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1091 unsigned long *rflags)
1092{
1093 switch (cr) {
1094 case 0:
1095 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1096 *rflags = kvm_arch_ops->get_rflags(vcpu);
1097 break;
1098 case 2:
1099 vcpu->cr2 = val;
1100 break;
1101 case 3:
1102 set_cr3(vcpu, val);
1103 break;
1104 case 4:
1105 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1106 break;
1107 default:
1108 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1109 }
1110}
1111
3bab1f5d
AK		 1112int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1113{
1114 u64 data;
1115
1116 switch (msr) {
1117 case 0xc0010010: /* SYSCFG */
1118 case 0xc0010015: /* HWCR */
1119 case MSR_IA32_PLATFORM_ID:
1120 case MSR_IA32_P5_MC_ADDR:
1121 case MSR_IA32_P5_MC_TYPE:
1122 case MSR_IA32_MC0_CTL:
1123 case MSR_IA32_MCG_STATUS:
1124 case MSR_IA32_MCG_CAP:
1125 case MSR_IA32_MC0_MISC:
1126 case MSR_IA32_MC0_MISC+4:
1127 case MSR_IA32_MC0_MISC+8:
1128 case MSR_IA32_MC0_MISC+12:
1129 case MSR_IA32_MC0_MISC+16:
1130 case MSR_IA32_UCODE_REV:
a8d13ea2 1131 case MSR_IA32_PERF_STATUS:
3bab1f5d
AK		 1132 /* MTRR registers */
1133 case 0xfe:
1134 case 0x200 ... 0x2ff:
1135 data = 0;
1136 break;
a8d13ea2
AK		 1137 case 0xcd: /* fsb frequency */
1138 data = 3;
1139 break;
3bab1f5d
AK		 1140 case MSR_IA32_APICBASE:
1141 data = vcpu->apic_base;
1142 break;
1143#ifdef CONFIG_X86_64
1144 case MSR_EFER:
1145 data = vcpu->shadow_efer;
1146 break;
1147#endif
1148 default:
1149 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1150 return 1;
1151 }
1152 *pdata = data;
1153 return 0;
1154}
1155EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1156
6aa8b732
AK		 1157/*
1158 * Reads an msr value (of 'msr_index') into 'pdata'.
1159 * Returns 0 on success, non-0 otherwise.
1160 * Assumes vcpu_load() was already called.
1161 */
1162static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1163{
1164 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1165}
1166
05b3e0c2 1167#ifdef CONFIG_X86_64
6aa8b732 1168
3bab1f5d 1169static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1170{
6aa8b732
AK		 1171 if (efer & EFER_RESERVED_BITS) {
1172 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1173 efer);
1174 inject_gp(vcpu);
1175 return;
1176 }
1177
1178 if (is_paging(vcpu)
1179 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1180 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1181 inject_gp(vcpu);
1182 return;
1183 }
1184
7725f0ba
AK		 1185 kvm_arch_ops->set_efer(vcpu, efer);
1186
6aa8b732
AK		 1187 efer &= ~EFER_LMA;
1188 efer |= vcpu->shadow_efer & EFER_LMA;
1189
1190 vcpu->shadow_efer = efer;
6aa8b732 1191}
6aa8b732
AK		 1192
1193#endif
1194
3bab1f5d
AK		 1195int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1196{
1197 switch (msr) {
1198#ifdef CONFIG_X86_64
1199 case MSR_EFER:
1200 set_efer(vcpu, data);
1201 break;
1202#endif
1203 case MSR_IA32_MC0_STATUS:
1204 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1205 __FUNCTION__, data);
1206 break;
1207 case MSR_IA32_UCODE_REV:
1208 case MSR_IA32_UCODE_WRITE:
1209 case 0x200 ... 0x2ff: /* MTRRs */
1210 break;
1211 case MSR_IA32_APICBASE:
1212 vcpu->apic_base = data;
1213 break;
1214 default:
1215 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1216 return 1;
1217 }
1218 return 0;
1219}
1220EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1221
6aa8b732
AK		 1222/*
1223 * Writes msr value into into the appropriate "register".
1224 * Returns 0 on success, non-0 otherwise.
1225 * Assumes vcpu_load() was already called.
1226 */
1227static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1228{
1229 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1230}
1231
1232void kvm_resched(struct kvm_vcpu *vcpu)
1233{
1234 vcpu_put(vcpu);
1235 cond_resched();
1236 /* Cannot fail - no vcpu unplug yet. */
1237 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1238}
1239EXPORT_SYMBOL_GPL(kvm_resched);
1240
1241void load_msrs(struct vmx_msr_entry *e, int n)
1242{
1243 int i;
1244
1245 for (i = 0; i < n; ++i)
1246 wrmsrl(e[i].index, e[i].data);
1247}
1248EXPORT_SYMBOL_GPL(load_msrs);
1249
1250void save_msrs(struct vmx_msr_entry *e, int n)
1251{
1252 int i;
1253
1254 for (i = 0; i < n; ++i)
1255 rdmsrl(e[i].index, e[i].data);
1256}
1257EXPORT_SYMBOL_GPL(save_msrs);
1258
1259static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1260{
1261 struct kvm_vcpu *vcpu;
1262 int r;
1263
5aacf0ca 1264 if (!valid_vcpu(kvm_run->vcpu))
6aa8b732
AK		 1265 return -EINVAL;
1266
1267 vcpu = vcpu_load(kvm, kvm_run->vcpu);
1268 if (!vcpu)
1269 return -ENOENT;
1270
1271 if (kvm_run->emulated) {
1272 kvm_arch_ops->skip_emulated_instruction(vcpu);
1273 kvm_run->emulated = 0;
1274 }
1275
1276 if (kvm_run->mmio_completed) {
1277 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1278 vcpu->mmio_read_completed = 1;
1279 }
1280
1281 vcpu->mmio_needed = 0;
1282
1283 r = kvm_arch_ops->run(vcpu, kvm_run);
1284
1285 vcpu_put(vcpu);
1286 return r;
1287}
1288
1289static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1290{
1291 struct kvm_vcpu *vcpu;
1292
5aacf0ca 1293 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1294 return -EINVAL;
1295
1296 vcpu = vcpu_load(kvm, regs->vcpu);
1297 if (!vcpu)
1298 return -ENOENT;
1299
1300 kvm_arch_ops->cache_regs(vcpu);
1301
1302 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1303 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1304 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1305 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1306 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1307 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1308 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1309 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1310#ifdef CONFIG_X86_64
6aa8b732
AK		 1311 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1312 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1313 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1314 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1315 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1316 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1317 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1318 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1319#endif
1320
1321 regs->rip = vcpu->rip;
1322 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1323
1324 /*
1325 * Don't leak debug flags in case they were set for guest debugging
1326 */
1327 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1328 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1329
1330 vcpu_put(vcpu);
1331
1332 return 0;
1333}
1334
1335static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1336{
1337 struct kvm_vcpu *vcpu;
1338
5aacf0ca 1339 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1340 return -EINVAL;
1341
1342 vcpu = vcpu_load(kvm, regs->vcpu);
1343 if (!vcpu)
1344 return -ENOENT;
1345
1346 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1347 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1348 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1349 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1350 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1351 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1352 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1353 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1354#ifdef CONFIG_X86_64
6aa8b732
AK		 1355 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1356 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1357 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1358 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1359 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1360 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1361 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1362 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1363#endif
1364
1365 vcpu->rip = regs->rip;
1366 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1367
1368 kvm_arch_ops->decache_regs(vcpu);
1369
1370 vcpu_put(vcpu);
1371
1372 return 0;
1373}
1374
1375static void get_segment(struct kvm_vcpu *vcpu,
1376 struct kvm_segment *var, int seg)
1377{
1378 return kvm_arch_ops->get_segment(vcpu, var, seg);
1379}
1380
1381static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1382{
1383 struct kvm_vcpu *vcpu;
1384 struct descriptor_table dt;
1385
5aacf0ca 1386 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1387 return -EINVAL;
1388 vcpu = vcpu_load(kvm, sregs->vcpu);
1389 if (!vcpu)
1390 return -ENOENT;
1391
1392 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1393 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1394 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1395 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1396 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1397 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1398
1399 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1400 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1401
1402 kvm_arch_ops->get_idt(vcpu, &dt);
1403 sregs->idt.limit = dt.limit;
1404 sregs->idt.base = dt.base;
1405 kvm_arch_ops->get_gdt(vcpu, &dt);
1406 sregs->gdt.limit = dt.limit;
1407 sregs->gdt.base = dt.base;
1408
1409 sregs->cr0 = vcpu->cr0;
1410 sregs->cr2 = vcpu->cr2;
1411 sregs->cr3 = vcpu->cr3;
1412 sregs->cr4 = vcpu->cr4;
1413 sregs->cr8 = vcpu->cr8;
1414 sregs->efer = vcpu->shadow_efer;
1415 sregs->apic_base = vcpu->apic_base;
1416
1417 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1418 sizeof sregs->interrupt_bitmap);
1419
1420 vcpu_put(vcpu);
1421
1422 return 0;
1423}
1424
1425static void set_segment(struct kvm_vcpu *vcpu,
1426 struct kvm_segment *var, int seg)
1427{
1428 return kvm_arch_ops->set_segment(vcpu, var, seg);
1429}
1430
1431static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1432{
1433 struct kvm_vcpu *vcpu;
1434 int mmu_reset_needed = 0;
1435 int i;
1436 struct descriptor_table dt;
1437
5aacf0ca 1438 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1439 return -EINVAL;
1440 vcpu = vcpu_load(kvm, sregs->vcpu);
1441 if (!vcpu)
1442 return -ENOENT;
1443
1444 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1445 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1446 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1447 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1448 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1449 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1450
1451 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1452 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1453
1454 dt.limit = sregs->idt.limit;
1455 dt.base = sregs->idt.base;
1456 kvm_arch_ops->set_idt(vcpu, &dt);
1457 dt.limit = sregs->gdt.limit;
1458 dt.base = sregs->gdt.base;
1459 kvm_arch_ops->set_gdt(vcpu, &dt);
1460
1461 vcpu->cr2 = sregs->cr2;
1462 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1463 vcpu->cr3 = sregs->cr3;
1464
1465 vcpu->cr8 = sregs->cr8;
1466
1467 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 1468#ifdef CONFIG_X86_64
6aa8b732
AK		 1469 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1470#endif
1471 vcpu->apic_base = sregs->apic_base;
1472
1473 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1474 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1475
1476 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1477 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1478
1479 if (mmu_reset_needed)
1480 kvm_mmu_reset_context(vcpu);
1481
1482 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1483 sizeof vcpu->irq_pending);
1484 vcpu->irq_summary = 0;
1485 for (i = 0; i < NR_IRQ_WORDS; ++i)
1486 if (vcpu->irq_pending[i])
1487 __set_bit(i, &vcpu->irq_summary);
1488
1489 vcpu_put(vcpu);
1490
1491 return 0;
1492}
1493
1494/*
1495 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1496 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 1497 *
1498 * This list is modified at module load time to reflect the
1499 * capabilities of the host cpu.
6aa8b732
AK		 1500 */
1501static u32 msrs_to_save[] = {
1502 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1503 MSR_K6_STAR,
05b3e0c2 1504#ifdef CONFIG_X86_64
6aa8b732
AK		 1505 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1506#endif
1507 MSR_IA32_TIME_STAMP_COUNTER,
1508};
1509
bf591b24
MR		 1510static unsigned num_msrs_to_save;
1511
1512static __init void kvm_init_msr_list(void)
1513{
1514 u32 dummy[2];
1515 unsigned i, j;
1516
1517 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1518 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1519 continue;
1520 if (j < i)
1521 msrs_to_save[j] = msrs_to_save[i];
1522 j++;
1523 }
1524 num_msrs_to_save = j;
1525}
6aa8b732
AK		 1526
1527/*
1528 * Adapt set_msr() to msr_io()'s calling convention
1529 */
1530static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1531{
1532 return set_msr(vcpu, index, *data);
1533}
1534
1535/*
1536 * Read or write a bunch of msrs. All parameters are kernel addresses.
1537 *
1538 * @return number of msrs set successfully.
1539 */
1540static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1541 struct kvm_msr_entry *entries,
1542 int (*do_msr)(struct kvm_vcpu *vcpu,
1543 unsigned index, u64 *data))
1544{
1545 struct kvm_vcpu *vcpu;
1546 int i;
1547
5aacf0ca 1548 if (!valid_vcpu(msrs->vcpu))
6aa8b732
AK		 1549 return -EINVAL;
1550
1551 vcpu = vcpu_load(kvm, msrs->vcpu);
1552 if (!vcpu)
1553 return -ENOENT;
1554
1555 for (i = 0; i < msrs->nmsrs; ++i)
1556 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1557 break;
1558
1559 vcpu_put(vcpu);
1560
1561 return i;
1562}
1563
1564/*
1565 * Read or write a bunch of msrs. Parameters are user addresses.
1566 *
1567 * @return number of msrs set successfully.
1568 */
1569static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1570 int (*do_msr)(struct kvm_vcpu *vcpu,
1571 unsigned index, u64 *data),
1572 int writeback)
1573{
1574 struct kvm_msrs msrs;
1575 struct kvm_msr_entry *entries;
1576 int r, n;
1577 unsigned size;
1578
1579 r = -EFAULT;
1580 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1581 goto out;
1582
1583 r = -E2BIG;
1584 if (msrs.nmsrs >= MAX_IO_MSRS)
1585 goto out;
1586
1587 r = -ENOMEM;
1588 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1589 entries = vmalloc(size);
1590 if (!entries)
1591 goto out;
1592
1593 r = -EFAULT;
1594 if (copy_from_user(entries, user_msrs->entries, size))
1595 goto out_free;
1596
1597 r = n = __msr_io(kvm, &msrs, entries, do_msr);
1598 if (r < 0)
1599 goto out_free;
1600
1601 r = -EFAULT;
1602 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1603 goto out_free;
1604
1605 r = n;
1606
1607out_free:
1608 vfree(entries);
1609out:
1610 return r;
1611}
1612
1613/*
1614 * Translate a guest virtual address to a guest physical address.
1615 */
1616static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1617{
1618 unsigned long vaddr = tr->linear_address;
1619 struct kvm_vcpu *vcpu;
1620 gpa_t gpa;
1621
1622 vcpu = vcpu_load(kvm, tr->vcpu);
1623 if (!vcpu)
1624 return -ENOENT;
1625 spin_lock(&kvm->lock);
1626 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1627 tr->physical_address = gpa;
1628 tr->valid = gpa != UNMAPPED_GVA;
1629 tr->writeable = 1;
1630 tr->usermode = 0;
1631 spin_unlock(&kvm->lock);
1632 vcpu_put(vcpu);
1633
1634 return 0;
1635}
1636
1637static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1638{
1639 struct kvm_vcpu *vcpu;
1640
5aacf0ca 1641 if (!valid_vcpu(irq->vcpu))
6aa8b732
AK		 1642 return -EINVAL;
1643 if (irq->irq < 0 || irq->irq >= 256)
1644 return -EINVAL;
1645 vcpu = vcpu_load(kvm, irq->vcpu);
1646 if (!vcpu)
1647 return -ENOENT;
1648
1649 set_bit(irq->irq, vcpu->irq_pending);
1650 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1651
1652 vcpu_put(vcpu);
1653
1654 return 0;
1655}
1656
1657static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1658 struct kvm_debug_guest *dbg)
1659{
1660 struct kvm_vcpu *vcpu;
1661 int r;
1662
5aacf0ca 1663 if (!valid_vcpu(dbg->vcpu))
6aa8b732
AK		 1664 return -EINVAL;
1665 vcpu = vcpu_load(kvm, dbg->vcpu);
1666 if (!vcpu)
1667 return -ENOENT;
1668
1669 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1670
1671 vcpu_put(vcpu);
1672
1673 return r;
1674}
1675
1676static long kvm_dev_ioctl(struct file *filp,
1677 unsigned int ioctl, unsigned long arg)
1678{
1679 struct kvm *kvm = filp->private_data;
1680 int r = -EINVAL;
1681
1682 switch (ioctl) {
0b76e20b
AK		 1683 case KVM_GET_API_VERSION:
1684 r = KVM_API_VERSION;
1685 break;
6aa8b732
AK		 1686 case KVM_CREATE_VCPU: {
1687 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1688 if (r)
1689 goto out;
1690 break;
1691 }
1692 case KVM_RUN: {
1693 struct kvm_run kvm_run;
1694
1695 r = -EFAULT;
1696 if (copy_from_user(&kvm_run, (void *)arg, sizeof kvm_run))
1697 goto out;
1698 r = kvm_dev_ioctl_run(kvm, &kvm_run);
c1150d8c 1699 if (r < 0 && r != -EINTR)
6aa8b732 1700 goto out;
c1150d8c
DL		 1701 if (copy_to_user((void *)arg, &kvm_run, sizeof kvm_run)) {
1702 r = -EFAULT;
6aa8b732 1703 goto out;
c1150d8c 1704 }
6aa8b732
AK		 1705 break;
1706 }
1707 case KVM_GET_REGS: {
1708 struct kvm_regs kvm_regs;
1709
1710 r = -EFAULT;
1711 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1712 goto out;
1713 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
1714 if (r)
1715 goto out;
1716 r = -EFAULT;
1717 if (copy_to_user((void *)arg, &kvm_regs, sizeof kvm_regs))
1718 goto out;
1719 r = 0;
1720 break;
1721 }
1722 case KVM_SET_REGS: {
1723 struct kvm_regs kvm_regs;
1724
1725 r = -EFAULT;
1726 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1727 goto out;
1728 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
1729 if (r)
1730 goto out;
1731 r = 0;
1732 break;
1733 }
1734 case KVM_GET_SREGS: {
1735 struct kvm_sregs kvm_sregs;
1736
1737 r = -EFAULT;
1738 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1739 goto out;
1740 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
1741 if (r)
1742 goto out;
1743 r = -EFAULT;
1744 if (copy_to_user((void *)arg, &kvm_sregs, sizeof kvm_sregs))
1745 goto out;
1746 r = 0;
1747 break;
1748 }
1749 case KVM_SET_SREGS: {
1750 struct kvm_sregs kvm_sregs;
1751
1752 r = -EFAULT;
1753 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1754 goto out;
1755 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
1756 if (r)
1757 goto out;
1758 r = 0;
1759 break;
1760 }
1761 case KVM_TRANSLATE: {
1762 struct kvm_translation tr;
1763
1764 r = -EFAULT;
1765 if (copy_from_user(&tr, (void *)arg, sizeof tr))
1766 goto out;
1767 r = kvm_dev_ioctl_translate(kvm, &tr);
1768 if (r)
1769 goto out;
1770 r = -EFAULT;
1771 if (copy_to_user((void *)arg, &tr, sizeof tr))
1772 goto out;
1773 r = 0;
1774 break;
1775 }
1776 case KVM_INTERRUPT: {
1777 struct kvm_interrupt irq;
1778
1779 r = -EFAULT;
1780 if (copy_from_user(&irq, (void *)arg, sizeof irq))
1781 goto out;
1782 r = kvm_dev_ioctl_interrupt(kvm, &irq);
1783 if (r)
1784 goto out;
1785 r = 0;
1786 break;
1787 }
1788 case KVM_DEBUG_GUEST: {
1789 struct kvm_debug_guest dbg;
1790
1791 r = -EFAULT;
1792 if (copy_from_user(&dbg, (void *)arg, sizeof dbg))
1793 goto out;
1794 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
1795 if (r)
1796 goto out;
1797 r = 0;
1798 break;
1799 }
1800 case KVM_SET_MEMORY_REGION: {
1801 struct kvm_memory_region kvm_mem;
1802
1803 r = -EFAULT;
1804 if (copy_from_user(&kvm_mem, (void *)arg, sizeof kvm_mem))
1805 goto out;
1806 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
1807 if (r)
1808 goto out;
1809 break;
1810 }
1811 case KVM_GET_DIRTY_LOG: {
1812 struct kvm_dirty_log log;
1813
1814 r = -EFAULT;
1815 if (copy_from_user(&log, (void *)arg, sizeof log))
1816 goto out;
1817 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
1818 if (r)
1819 goto out;
1820 break;
1821 }
1822 case KVM_GET_MSRS:
1823 r = msr_io(kvm, (void __user *)arg, get_msr, 1);
1824 break;
1825 case KVM_SET_MSRS:
1826 r = msr_io(kvm, (void __user *)arg, do_set_msr, 0);
1827 break;
1828 case KVM_GET_MSR_INDEX_LIST: {
1829 struct kvm_msr_list __user *user_msr_list = (void __user *)arg;
1830 struct kvm_msr_list msr_list;
1831 unsigned n;
1832
1833 r = -EFAULT;
1834 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1835 goto out;
1836 n = msr_list.nmsrs;
bf591b24 1837 msr_list.nmsrs = num_msrs_to_save;
6aa8b732
AK		 1838 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1839 goto out;
1840 r = -E2BIG;
bf591b24 1841 if (n < num_msrs_to_save)
6aa8b732
AK		 1842 goto out;
1843 r = -EFAULT;
1844 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 1845 num_msrs_to_save * sizeof(u32)))
6aa8b732
AK		 1846 goto out;
1847 r = 0;
1848 }
1849 default:
1850 ;
1851 }
1852out:
1853 return r;
1854}
1855
1856static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
1857 unsigned long address,
1858 int *type)
1859{
1860 struct kvm *kvm = vma->vm_file->private_data;
1861 unsigned long pgoff;
1862 struct kvm_memory_slot *slot;
1863 struct page *page;
1864
1865 *type = VM_FAULT_MINOR;
1866 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1867 slot = gfn_to_memslot(kvm, pgoff);
1868 if (!slot)
1869 return NOPAGE_SIGBUS;
1870 page = gfn_to_page(slot, pgoff);
1871 if (!page)
1872 return NOPAGE_SIGBUS;
1873 get_page(page);
1874 return page;
1875}
1876
1877static struct vm_operations_struct kvm_dev_vm_ops = {
1878 .nopage = kvm_dev_nopage,
1879};
1880
1881static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
1882{
1883 vma->vm_ops = &kvm_dev_vm_ops;
1884 return 0;
1885}
1886
1887static struct file_operations kvm_chardev_ops = {
1888 .open = kvm_dev_open,
1889 .release = kvm_dev_release,
1890 .unlocked_ioctl = kvm_dev_ioctl,
1891 .compat_ioctl = kvm_dev_ioctl,
1892 .mmap = kvm_dev_mmap,
1893};
1894
1895static struct miscdevice kvm_dev = {
1896 MISC_DYNAMIC_MINOR,
1897 "kvm",
1898 &kvm_chardev_ops,
1899};
1900
1901static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1902 void *v)
1903{
1904 if (val == SYS_RESTART) {
1905 /*
1906 * Some (well, at least mine) BIOSes hang on reboot if
1907 * in vmx root mode.
1908 */
1909 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1910 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1911 }
1912 return NOTIFY_OK;
1913}
1914
1915static struct notifier_block kvm_reboot_notifier = {
1916 .notifier_call = kvm_reboot,
1917 .priority = 0,
1918};
1919
1920static __init void kvm_init_debug(void)
1921{
1922 struct kvm_stats_debugfs_item *p;
1923
1924 debugfs_dir = debugfs_create_dir("kvm", 0);
1925 for (p = debugfs_entries; p->name; ++p)
1926 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
1927 p->data);
1928}
1929
1930static void kvm_exit_debug(void)
1931{
1932 struct kvm_stats_debugfs_item *p;
1933
1934 for (p = debugfs_entries; p->name; ++p)
1935 debugfs_remove(p->dentry);
1936 debugfs_remove(debugfs_dir);
1937}
1938
1939hpa_t bad_page_address;
1940
1941int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
1942{
1943 int r;
1944
09db28b8
YI		 1945 if (kvm_arch_ops) {
1946 printk(KERN_ERR "kvm: already loaded the other module\n");
1947 return -EEXIST;
1948 }
1949
e097f35c 1950 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 1951 printk(KERN_ERR "kvm: no hardware support\n");
1952 return -EOPNOTSUPP;
1953 }
e097f35c 1954 if (ops->disabled_by_bios()) {
6aa8b732
AK		 1955 printk(KERN_ERR "kvm: disabled by bios\n");
1956 return -EOPNOTSUPP;
1957 }
1958
e097f35c
YI		 1959 kvm_arch_ops = ops;
1960
6aa8b732
AK		 1961 r = kvm_arch_ops->hardware_setup();
1962 if (r < 0)
1963 return r;
1964
1965 on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1);
1966 register_reboot_notifier(&kvm_reboot_notifier);
1967
1968 kvm_chardev_ops.owner = module;
1969
1970 r = misc_register(&kvm_dev);
1971 if (r) {
1972 printk (KERN_ERR "kvm: misc device register failed\n");
1973 goto out_free;
1974 }
1975
1976 return r;
1977
1978out_free:
1979 unregister_reboot_notifier(&kvm_reboot_notifier);
1980 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1981 kvm_arch_ops->hardware_unsetup();
1982 return r;
1983}
1984
1985void kvm_exit_arch(void)
1986{
1987 misc_deregister(&kvm_dev);
1988
1989 unregister_reboot_notifier(&kvm_reboot_notifier);
1990 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1991 kvm_arch_ops->hardware_unsetup();
09db28b8 1992 kvm_arch_ops = NULL;
6aa8b732
AK		 1993}
1994
1995static __init int kvm_init(void)
1996{
1997 static struct page *bad_page;
1998 int r = 0;
1999
2000 kvm_init_debug();
2001
bf591b24
MR		 2002 kvm_init_msr_list();
2003
6aa8b732
AK		 2004 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2005 r = -ENOMEM;
2006 goto out;
2007 }
2008
2009 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2010 memset(__va(bad_page_address), 0, PAGE_SIZE);
2011
2012 return r;
2013
2014out:
2015 kvm_exit_debug();
2016 return r;
2017}
2018
2019static __exit void kvm_exit(void)
2020{
2021 kvm_exit_debug();
2022 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
2023}
2024
2025module_init(kvm_init)
2026module_exit(kvm_exit)
2027
2028EXPORT_SYMBOL_GPL(kvm_init_arch);
2029EXPORT_SYMBOL_GPL(kvm_exit_arch);
kernel source for telekom puls (alcatel/mediatek)