projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] hotplug: Allow modules to use the cpu hotplug notifiers even if !CONFIG_HOTPL...
[GitHub/exynos8895/android_kernel_samsung_universal8895.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 64 { "irq_exits", &kvm_stat.irq_exits },
8b6d44c7 65 { NULL, NULL }
6aa8b732
AK		 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);
8b6d44c7 208 return NULL;
6aa8b732
AK		 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);
86a2b42e 233 vcpu->kvm = kvm;
6aa8b732
AK		 234 vcpu->mmu.root_hpa = INVALID_PAGE;
235 INIT_LIST_HEAD(&vcpu->free_pages);
236 }
237 filp->private_data = kvm;
238 return 0;
239}
240
241/*
242 * Free any memory in @free but not in @dont.
243 */
244static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
245 struct kvm_memory_slot *dont)
246{
247 int i;
248
249 if (!dont || free->phys_mem != dont->phys_mem)
250 if (free->phys_mem) {
251 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 252 if (free->phys_mem[i])
253 __free_page(free->phys_mem[i]);
6aa8b732
AK		 254 vfree(free->phys_mem);
255 }
256
257 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
258 vfree(free->dirty_bitmap);
259
8b6d44c7 260 free->phys_mem = NULL;
6aa8b732 261 free->npages = 0;
8b6d44c7 262 free->dirty_bitmap = NULL;
6aa8b732
AK		 263}
264
265static void kvm_free_physmem(struct kvm *kvm)
266{
267 int i;
268
269 for (i = 0; i < kvm->nmemslots; ++i)
8b6d44c7 270 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
6aa8b732
AK		 271}
272
273static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
274{
1e8ba6fb
IM		 275 if (!vcpu_load(vcpu->kvm, vcpu_slot(vcpu)))
276 return;
277
6aa8b732 278 kvm_mmu_destroy(vcpu);
08438475 279 vcpu_put(vcpu);
9ede74e0 280 kvm_arch_ops->vcpu_free(vcpu);
6aa8b732
AK		 281}
282
283static void kvm_free_vcpus(struct kvm *kvm)
284{
285 unsigned int i;
286
287 for (i = 0; i < KVM_MAX_VCPUS; ++i)
288 kvm_free_vcpu(&kvm->vcpus[i]);
289}
290
291static int kvm_dev_release(struct inode *inode, struct file *filp)
292{
293 struct kvm *kvm = filp->private_data;
294
295 kvm_free_vcpus(kvm);
296 kvm_free_physmem(kvm);
297 kfree(kvm);
298 return 0;
299}
300
301static void inject_gp(struct kvm_vcpu *vcpu)
302{
303 kvm_arch_ops->inject_gp(vcpu, 0);
304}
305
1342d353
AK		 306/*
307 * Load the pae pdptrs. Return true is they are all valid.
308 */
309static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
6aa8b732
AK		 310{
311 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
1342d353 312 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
6aa8b732
AK		 313 int i;
314 u64 pdpte;
315 u64 *pdpt;
1342d353 316 int ret;
6aa8b732
AK		 317 struct kvm_memory_slot *memslot;
318
319 spin_lock(&vcpu->kvm->lock);
320 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
321 /* FIXME: !memslot - emulate? 0xff? */
322 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
323
1342d353 324 ret = 1;
6aa8b732
AK		 325 for (i = 0; i < 4; ++i) {
326 pdpte = pdpt[offset + i];
1342d353
AK		 327 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
328 ret = 0;
329 goto out;
330 }
6aa8b732
AK		 331 }
332
1342d353
AK		 333 for (i = 0; i < 4; ++i)
334 vcpu->pdptrs[i] = pdpt[offset + i];
335
336out:
6aa8b732
AK		 337 kunmap_atomic(pdpt, KM_USER0);
338 spin_unlock(&vcpu->kvm->lock);
339
1342d353 340 return ret;
6aa8b732
AK		 341}
342
343void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
344{
345 if (cr0 & CR0_RESEVED_BITS) {
346 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
347 cr0, vcpu->cr0);
348 inject_gp(vcpu);
349 return;
350 }
351
352 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
353 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
354 inject_gp(vcpu);
355 return;
356 }
357
358 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
359 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
360 "and a clear PE flag\n");
361 inject_gp(vcpu);
362 return;
363 }
364
365 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 366#ifdef CONFIG_X86_64
6aa8b732
AK		 367 if ((vcpu->shadow_efer & EFER_LME)) {
368 int cs_db, cs_l;
369
370 if (!is_pae(vcpu)) {
371 printk(KERN_DEBUG "set_cr0: #GP, start paging "
372 "in long mode while PAE is disabled\n");
373 inject_gp(vcpu);
374 return;
375 }
376 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
377 if (cs_l) {
378 printk(KERN_DEBUG "set_cr0: #GP, start paging "
379 "in long mode while CS.L == 1\n");
380 inject_gp(vcpu);
381 return;
382
383 }
384 } else
385#endif
1342d353 386 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 387 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
388 "reserved bits\n");
389 inject_gp(vcpu);
390 return;
391 }
392
393 }
394
395 kvm_arch_ops->set_cr0(vcpu, cr0);
396 vcpu->cr0 = cr0;
397
398 spin_lock(&vcpu->kvm->lock);
399 kvm_mmu_reset_context(vcpu);
400 spin_unlock(&vcpu->kvm->lock);
401 return;
402}
403EXPORT_SYMBOL_GPL(set_cr0);
404
405void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
406{
399badf3 407 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 408 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
409}
410EXPORT_SYMBOL_GPL(lmsw);
411
412void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
413{
414 if (cr4 & CR4_RESEVED_BITS) {
415 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
416 inject_gp(vcpu);
417 return;
418 }
419
a9058ecd 420 if (is_long_mode(vcpu)) {
6aa8b732
AK		 421 if (!(cr4 & CR4_PAE_MASK)) {
422 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
423 "in long mode\n");
424 inject_gp(vcpu);
425 return;
426 }
427 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
1342d353 428 && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 429 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
430 inject_gp(vcpu);
431 }
432
433 if (cr4 & CR4_VMXE_MASK) {
434 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
435 inject_gp(vcpu);
436 return;
437 }
438 kvm_arch_ops->set_cr4(vcpu, cr4);
439 spin_lock(&vcpu->kvm->lock);
440 kvm_mmu_reset_context(vcpu);
441 spin_unlock(&vcpu->kvm->lock);
442}
443EXPORT_SYMBOL_GPL(set_cr4);
444
445void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
446{
a9058ecd 447 if (is_long_mode(vcpu)) {
6aa8b732
AK		 448 if ( cr3 & CR3_L_MODE_RESEVED_BITS) {
449 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
450 inject_gp(vcpu);
451 return;
452 }
453 } else {
454 if (cr3 & CR3_RESEVED_BITS) {
455 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
456 inject_gp(vcpu);
457 return;
458 }
459 if (is_paging(vcpu) && is_pae(vcpu) &&
1342d353 460 !load_pdptrs(vcpu, cr3)) {
6aa8b732
AK		 461 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
462 "reserved bits\n");
463 inject_gp(vcpu);
464 return;
465 }
466 }
467
468 vcpu->cr3 = cr3;
469 spin_lock(&vcpu->kvm->lock);
d21225ee
IM		 470 /*
471 * Does the new cr3 value map to physical memory? (Note, we
472 * catch an invalid cr3 even in real-mode, because it would
473 * cause trouble later on when we turn on paging anyway.)
474 *
475 * A real CPU would silently accept an invalid cr3 and would
476 * attempt to use it - with largely undefined (and often hard
477 * to debug) behavior on the guest side.
478 */
479 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
480 inject_gp(vcpu);
481 else
482 vcpu->mmu.new_cr3(vcpu);
6aa8b732
AK		 483 spin_unlock(&vcpu->kvm->lock);
484}
485EXPORT_SYMBOL_GPL(set_cr3);
486
487void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
488{
489 if ( cr8 & CR8_RESEVED_BITS) {
490 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
491 inject_gp(vcpu);
492 return;
493 }
494 vcpu->cr8 = cr8;
495}
496EXPORT_SYMBOL_GPL(set_cr8);
497
498void fx_init(struct kvm_vcpu *vcpu)
499{
500 struct __attribute__ ((__packed__)) fx_image_s {
501 u16 control; //fcw
502 u16 status; //fsw
503 u16 tag; // ftw
504 u16 opcode; //fop
505 u64 ip; // fpu ip
506 u64 operand;// fpu dp
507 u32 mxcsr;
508 u32 mxcsr_mask;
509
510 } *fx_image;
511
512 fx_save(vcpu->host_fx_image);
513 fpu_init();
514 fx_save(vcpu->guest_fx_image);
515 fx_restore(vcpu->host_fx_image);
516
517 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
518 fx_image->mxcsr = 0x1f80;
519 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
520 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
521}
522EXPORT_SYMBOL_GPL(fx_init);
523
524/*
525 * Creates some virtual cpus. Good luck creating more than one.
526 */
527static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
528{
529 int r;
530 struct kvm_vcpu *vcpu;
531
532 r = -EINVAL;
5aacf0ca 533 if (!valid_vcpu(n))
6aa8b732
AK		 534 goto out;
535
536 vcpu = &kvm->vcpus[n];
537
538 mutex_lock(&vcpu->mutex);
539
540 if (vcpu->vmcs) {
541 mutex_unlock(&vcpu->mutex);
542 return -EEXIST;
543 }
544
545 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
546 FX_IMAGE_ALIGN);
547 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
548
549 vcpu->cpu = -1; /* First load will set up TR */
6aa8b732
AK		 550 r = kvm_arch_ops->vcpu_create(vcpu);
551 if (r < 0)
552 goto out_free_vcpus;
553
8018c27b
IM		 554 r = kvm_mmu_create(vcpu);
555 if (r < 0)
556 goto out_free_vcpus;
6aa8b732 557
8018c27b
IM		 558 kvm_arch_ops->vcpu_load(vcpu);
559 r = kvm_mmu_setup(vcpu);
6aa8b732 560 if (r >= 0)
8018c27b 561 r = kvm_arch_ops->vcpu_setup(vcpu);
6aa8b732
AK		 562 vcpu_put(vcpu);
563
564 if (r < 0)
565 goto out_free_vcpus;
566
567 return 0;
568
569out_free_vcpus:
570 kvm_free_vcpu(vcpu);
571 mutex_unlock(&vcpu->mutex);
572out:
573 return r;
574}
575
576/*
577 * Allocate some memory and give it an address in the guest physical address
578 * space.
579 *
580 * Discontiguous memory is allowed, mostly for framebuffers.
581 */
582static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm,
583 struct kvm_memory_region *mem)
584{
585 int r;
586 gfn_t base_gfn;
587 unsigned long npages;
588 unsigned long i;
589 struct kvm_memory_slot *memslot;
590 struct kvm_memory_slot old, new;
591 int memory_config_version;
592
593 r = -EINVAL;
594 /* General sanity checks */
595 if (mem->memory_size & (PAGE_SIZE - 1))
596 goto out;
597 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
598 goto out;
599 if (mem->slot >= KVM_MEMORY_SLOTS)
600 goto out;
601 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
602 goto out;
603
604 memslot = &kvm->memslots[mem->slot];
605 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
606 npages = mem->memory_size >> PAGE_SHIFT;
607
608 if (!npages)
609 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
610
611raced:
612 spin_lock(&kvm->lock);
613
614 memory_config_version = kvm->memory_config_version;
615 new = old = *memslot;
616
617 new.base_gfn = base_gfn;
618 new.npages = npages;
619 new.flags = mem->flags;
620
621 /* Disallow changing a memory slot's size. */
622 r = -EINVAL;
623 if (npages && old.npages && npages != old.npages)
624 goto out_unlock;
625
626 /* Check for overlaps */
627 r = -EEXIST;
628 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
629 struct kvm_memory_slot *s = &kvm->memslots[i];
630
631 if (s == memslot)
632 continue;
633 if (!((base_gfn + npages <= s->base_gfn) ||
634 (base_gfn >= s->base_gfn + s->npages)))
635 goto out_unlock;
636 }
637 /*
638 * Do memory allocations outside lock. memory_config_version will
639 * detect any races.
640 */
641 spin_unlock(&kvm->lock);
642
643 /* Deallocate if slot is being removed */
644 if (!npages)
8b6d44c7 645 new.phys_mem = NULL;
6aa8b732
AK		 646
647 /* Free page dirty bitmap if unneeded */
648 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
8b6d44c7 649 new.dirty_bitmap = NULL;
6aa8b732
AK		 650
651 r = -ENOMEM;
652
653 /* Allocate if a slot is being created */
654 if (npages && !new.phys_mem) {
655 new.phys_mem = vmalloc(npages * sizeof(struct page *));
656
657 if (!new.phys_mem)
658 goto out_free;
659
660 memset(new.phys_mem, 0, npages * sizeof(struct page *));
661 for (i = 0; i < npages; ++i) {
662 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
663 | __GFP_ZERO);
664 if (!new.phys_mem[i])
665 goto out_free;
cd4a4e53 666 new.phys_mem[i]->private = 0;
6aa8b732
AK		 667 }
668 }
669
670 /* Allocate page dirty bitmap if needed */
671 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
672 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
673
674 new.dirty_bitmap = vmalloc(dirty_bytes);
675 if (!new.dirty_bitmap)
676 goto out_free;
677 memset(new.dirty_bitmap, 0, dirty_bytes);
678 }
679
680 spin_lock(&kvm->lock);
681
682 if (memory_config_version != kvm->memory_config_version) {
683 spin_unlock(&kvm->lock);
684 kvm_free_physmem_slot(&new, &old);
685 goto raced;
686 }
687
688 r = -EAGAIN;
689 if (kvm->busy)
690 goto out_unlock;
691
692 if (mem->slot >= kvm->nmemslots)
693 kvm->nmemslots = mem->slot + 1;
694
695 *memslot = new;
696 ++kvm->memory_config_version;
697
698 spin_unlock(&kvm->lock);
699
700 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
701 struct kvm_vcpu *vcpu;
702
703 vcpu = vcpu_load(kvm, i);
704 if (!vcpu)
705 continue;
706 kvm_mmu_reset_context(vcpu);
707 vcpu_put(vcpu);
708 }
709
710 kvm_free_physmem_slot(&old, &new);
711 return 0;
712
713out_unlock:
714 spin_unlock(&kvm->lock);
715out_free:
716 kvm_free_physmem_slot(&new, &old);
717out:
718 return r;
719}
720
714b93da
AK		 721static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
722{
723 spin_lock(&vcpu->kvm->lock);
724 kvm_mmu_slot_remove_write_access(vcpu, slot);
725 spin_unlock(&vcpu->kvm->lock);
726}
727
6aa8b732
AK		 728/*
729 * Get (and clear) the dirty memory log for a memory slot.
730 */
731static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
732 struct kvm_dirty_log *log)
733{
734 struct kvm_memory_slot *memslot;
735 int r, i;
736 int n;
714b93da 737 int cleared;
6aa8b732
AK		 738 unsigned long any = 0;
739
740 spin_lock(&kvm->lock);
741
742 /*
743 * Prevent changes to guest memory configuration even while the lock
744 * is not taken.
745 */
746 ++kvm->busy;
747 spin_unlock(&kvm->lock);
748 r = -EINVAL;
749 if (log->slot >= KVM_MEMORY_SLOTS)
750 goto out;
751
752 memslot = &kvm->memslots[log->slot];
753 r = -ENOENT;
754 if (!memslot->dirty_bitmap)
755 goto out;
756
757 n = ALIGN(memslot->npages, 8) / 8;
758
759 for (i = 0; !any && i < n; ++i)
760 any = memslot->dirty_bitmap[i];
761
762 r = -EFAULT;
763 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
764 goto out;
765
766
767 if (any) {
714b93da 768 cleared = 0;
6aa8b732
AK		 769 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
770 struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
771
772 if (!vcpu)
773 continue;
714b93da
AK		 774 if (!cleared) {
775 do_remove_write_access(vcpu, log->slot);
776 memset(memslot->dirty_bitmap, 0, n);
777 cleared = 1;
778 }
6aa8b732
AK		 779 kvm_arch_ops->tlb_flush(vcpu);
780 vcpu_put(vcpu);
781 }
782 }
783
784 r = 0;
785
786out:
787 spin_lock(&kvm->lock);
788 --kvm->busy;
789 spin_unlock(&kvm->lock);
790 return r;
791}
792
793struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
794{
795 int i;
796
797 for (i = 0; i < kvm->nmemslots; ++i) {
798 struct kvm_memory_slot *memslot = &kvm->memslots[i];
799
800 if (gfn >= memslot->base_gfn
801 && gfn < memslot->base_gfn + memslot->npages)
802 return memslot;
803 }
8b6d44c7 804 return NULL;
6aa8b732
AK		 805}
806EXPORT_SYMBOL_GPL(gfn_to_memslot);
807
808void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
809{
810 int i;
8b6d44c7 811 struct kvm_memory_slot *memslot = NULL;
6aa8b732
AK		 812 unsigned long rel_gfn;
813
814 for (i = 0; i < kvm->nmemslots; ++i) {
815 memslot = &kvm->memslots[i];
816
817 if (gfn >= memslot->base_gfn
818 && gfn < memslot->base_gfn + memslot->npages) {
819
820 if (!memslot || !memslot->dirty_bitmap)
821 return;
822
823 rel_gfn = gfn - memslot->base_gfn;
824
825 /* avoid RMW */
826 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
827 set_bit(rel_gfn, memslot->dirty_bitmap);
828 return;
829 }
830 }
831}
832
833static int emulator_read_std(unsigned long addr,
834 unsigned long *val,
835 unsigned int bytes,
836 struct x86_emulate_ctxt *ctxt)
837{
838 struct kvm_vcpu *vcpu = ctxt->vcpu;
839 void *data = val;
840
841 while (bytes) {
842 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
843 unsigned offset = addr & (PAGE_SIZE-1);
844 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
845 unsigned long pfn;
846 struct kvm_memory_slot *memslot;
847 void *page;
848
849 if (gpa == UNMAPPED_GVA)
850 return X86EMUL_PROPAGATE_FAULT;
851 pfn = gpa >> PAGE_SHIFT;
852 memslot = gfn_to_memslot(vcpu->kvm, pfn);
853 if (!memslot)
854 return X86EMUL_UNHANDLEABLE;
855 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
856
857 memcpy(data, page + offset, tocopy);
858
859 kunmap_atomic(page, KM_USER0);
860
861 bytes -= tocopy;
862 data += tocopy;
863 addr += tocopy;
864 }
865
866 return X86EMUL_CONTINUE;
867}
868
869static int emulator_write_std(unsigned long addr,
870 unsigned long val,
871 unsigned int bytes,
872 struct x86_emulate_ctxt *ctxt)
873{
874 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
875 addr, bytes);
876 return X86EMUL_UNHANDLEABLE;
877}
878
879static int emulator_read_emulated(unsigned long addr,
880 unsigned long *val,
881 unsigned int bytes,
882 struct x86_emulate_ctxt *ctxt)
883{
884 struct kvm_vcpu *vcpu = ctxt->vcpu;
885
886 if (vcpu->mmio_read_completed) {
887 memcpy(val, vcpu->mmio_data, bytes);
888 vcpu->mmio_read_completed = 0;
889 return X86EMUL_CONTINUE;
890 } else if (emulator_read_std(addr, val, bytes, ctxt)
891 == X86EMUL_CONTINUE)
892 return X86EMUL_CONTINUE;
893 else {
894 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
895 if (gpa == UNMAPPED_GVA)
896 return vcpu_printf(vcpu, "not present\n"), X86EMUL_PROPAGATE_FAULT;
897 vcpu->mmio_needed = 1;
898 vcpu->mmio_phys_addr = gpa;
899 vcpu->mmio_size = bytes;
900 vcpu->mmio_is_write = 0;
901
902 return X86EMUL_UNHANDLEABLE;
903 }
904}
905
da4a00f0
AK		 906static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
907 unsigned long val, int bytes)
908{
909 struct kvm_memory_slot *m;
910 struct page *page;
911 void *virt;
912
913 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
914 return 0;
915 m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
916 if (!m)
917 return 0;
918 page = gfn_to_page(m, gpa >> PAGE_SHIFT);
919 kvm_mmu_pre_write(vcpu, gpa, bytes);
920 virt = kmap_atomic(page, KM_USER0);
921 memcpy(virt + offset_in_page(gpa), &val, bytes);
922 kunmap_atomic(virt, KM_USER0);
923 kvm_mmu_post_write(vcpu, gpa, bytes);
924 return 1;
925}
926
6aa8b732
AK		 927static int emulator_write_emulated(unsigned long addr,
928 unsigned long val,
929 unsigned int bytes,
930 struct x86_emulate_ctxt *ctxt)
931{
932 struct kvm_vcpu *vcpu = ctxt->vcpu;
933 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
934
935 if (gpa == UNMAPPED_GVA)
936 return X86EMUL_PROPAGATE_FAULT;
937
da4a00f0
AK		 938 if (emulator_write_phys(vcpu, gpa, val, bytes))
939 return X86EMUL_CONTINUE;
940
6aa8b732
AK		 941 vcpu->mmio_needed = 1;
942 vcpu->mmio_phys_addr = gpa;
943 vcpu->mmio_size = bytes;
944 vcpu->mmio_is_write = 1;
945 memcpy(vcpu->mmio_data, &val, bytes);
946
947 return X86EMUL_CONTINUE;
948}
949
950static int emulator_cmpxchg_emulated(unsigned long addr,
951 unsigned long old,
952 unsigned long new,
953 unsigned int bytes,
954 struct x86_emulate_ctxt *ctxt)
955{
956 static int reported;
957
958 if (!reported) {
959 reported = 1;
960 printk(KERN_WARNING "kvm: emulating exchange as write\n");
961 }
962 return emulator_write_emulated(addr, new, bytes, ctxt);
963}
964
32b35627
AK		 965#ifdef CONFIG_X86_32
966
967static int emulator_cmpxchg8b_emulated(unsigned long addr,
968 unsigned long old_lo,
969 unsigned long old_hi,
970 unsigned long new_lo,
971 unsigned long new_hi,
972 struct x86_emulate_ctxt *ctxt)
973{
974 static int reported;
975 int r;
976
977 if (!reported) {
978 reported = 1;
979 printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
980 }
981 r = emulator_write_emulated(addr, new_lo, 4, ctxt);
982 if (r != X86EMUL_CONTINUE)
983 return r;
984 return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
985}
986
987#endif
988
6aa8b732
AK		 989static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
990{
991 return kvm_arch_ops->get_segment_base(vcpu, seg);
992}
993
994int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
995{
6aa8b732
AK		 996 return X86EMUL_CONTINUE;
997}
998
999int emulate_clts(struct kvm_vcpu *vcpu)
1000{
399badf3 1001 unsigned long cr0;
6aa8b732 1002
399badf3
AK		 1003 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1004 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
6aa8b732
AK		 1005 kvm_arch_ops->set_cr0(vcpu, cr0);
1006 return X86EMUL_CONTINUE;
1007}
1008
1009int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1010{
1011 struct kvm_vcpu *vcpu = ctxt->vcpu;
1012
1013 switch (dr) {
1014 case 0 ... 3:
1015 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1016 return X86EMUL_CONTINUE;
1017 default:
1018 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1019 __FUNCTION__, dr);
1020 return X86EMUL_UNHANDLEABLE;
1021 }
1022}
1023
1024int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1025{
1026 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1027 int exception;
1028
1029 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1030 if (exception) {
1031 /* FIXME: better handling */
1032 return X86EMUL_UNHANDLEABLE;
1033 }
1034 return X86EMUL_CONTINUE;
1035}
1036
1037static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1038{
1039 static int reported;
1040 u8 opcodes[4];
1041 unsigned long rip = ctxt->vcpu->rip;
1042 unsigned long rip_linear;
1043
1044 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1045
1046 if (reported)
1047 return;
1048
1049 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1050
1051 printk(KERN_ERR "emulation failed but !mmio_needed?"
1052 " rip %lx %02x %02x %02x %02x\n",
1053 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1054 reported = 1;
1055}
1056
1057struct x86_emulate_ops emulate_ops = {
1058 .read_std = emulator_read_std,
1059 .write_std = emulator_write_std,
1060 .read_emulated = emulator_read_emulated,
1061 .write_emulated = emulator_write_emulated,
1062 .cmpxchg_emulated = emulator_cmpxchg_emulated,
32b35627
AK		 1063#ifdef CONFIG_X86_32
1064 .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated,
1065#endif
6aa8b732
AK		 1066};
1067
1068int emulate_instruction(struct kvm_vcpu *vcpu,
1069 struct kvm_run *run,
1070 unsigned long cr2,
1071 u16 error_code)
1072{
1073 struct x86_emulate_ctxt emulate_ctxt;
1074 int r;
1075 int cs_db, cs_l;
1076
1077 kvm_arch_ops->cache_regs(vcpu);
1078
1079 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1080
1081 emulate_ctxt.vcpu = vcpu;
1082 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1083 emulate_ctxt.cr2 = cr2;
1084 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1085 ? X86EMUL_MODE_REAL : cs_l
1086 ? X86EMUL_MODE_PROT64 : cs_db
1087 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1088
1089 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1090 emulate_ctxt.cs_base = 0;
1091 emulate_ctxt.ds_base = 0;
1092 emulate_ctxt.es_base = 0;
1093 emulate_ctxt.ss_base = 0;
1094 } else {
1095 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1096 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1097 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1098 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1099 }
1100
1101 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1102 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1103
1104 vcpu->mmio_is_write = 0;
1105 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1106
1107 if ((r || vcpu->mmio_is_write) && run) {
1108 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1109 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1110 run->mmio.len = vcpu->mmio_size;
1111 run->mmio.is_write = vcpu->mmio_is_write;
1112 }
1113
1114 if (r) {
a436036b
AK		 1115 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1116 return EMULATE_DONE;
6aa8b732
AK		 1117 if (!vcpu->mmio_needed) {
1118 report_emulation_failure(&emulate_ctxt);
1119 return EMULATE_FAIL;
1120 }
1121 return EMULATE_DO_MMIO;
1122 }
1123
1124 kvm_arch_ops->decache_regs(vcpu);
1125 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1126
1127 if (vcpu->mmio_is_write)
1128 return EMULATE_DO_MMIO;
1129
1130 return EMULATE_DONE;
1131}
1132EXPORT_SYMBOL_GPL(emulate_instruction);
1133
1134static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1135{
1136 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1137}
1138
1139void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1140{
1141 struct descriptor_table dt = { limit, base };
1142
1143 kvm_arch_ops->set_gdt(vcpu, &dt);
1144}
1145
1146void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1147{
1148 struct descriptor_table dt = { limit, base };
1149
1150 kvm_arch_ops->set_idt(vcpu, &dt);
1151}
1152
1153void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1154 unsigned long *rflags)
1155{
1156 lmsw(vcpu, msw);
1157 *rflags = kvm_arch_ops->get_rflags(vcpu);
1158}
1159
1160unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1161{
399badf3 1162 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1163 switch (cr) {
1164 case 0:
1165 return vcpu->cr0;
1166 case 2:
1167 return vcpu->cr2;
1168 case 3:
1169 return vcpu->cr3;
1170 case 4:
1171 return vcpu->cr4;
1172 default:
1173 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1174 return 0;
1175 }
1176}
1177
1178void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1179 unsigned long *rflags)
1180{
1181 switch (cr) {
1182 case 0:
1183 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1184 *rflags = kvm_arch_ops->get_rflags(vcpu);
1185 break;
1186 case 2:
1187 vcpu->cr2 = val;
1188 break;
1189 case 3:
1190 set_cr3(vcpu, val);
1191 break;
1192 case 4:
1193 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1194 break;
1195 default:
1196 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1197 }
1198}
1199
3bab1f5d
AK		 1200int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1201{
1202 u64 data;
1203
1204 switch (msr) {
1205 case 0xc0010010: /* SYSCFG */
1206 case 0xc0010015: /* HWCR */
1207 case MSR_IA32_PLATFORM_ID:
1208 case MSR_IA32_P5_MC_ADDR:
1209 case MSR_IA32_P5_MC_TYPE:
1210 case MSR_IA32_MC0_CTL:
1211 case MSR_IA32_MCG_STATUS:
1212 case MSR_IA32_MCG_CAP:
1213 case MSR_IA32_MC0_MISC:
1214 case MSR_IA32_MC0_MISC+4:
1215 case MSR_IA32_MC0_MISC+8:
1216 case MSR_IA32_MC0_MISC+12:
1217 case MSR_IA32_MC0_MISC+16:
1218 case MSR_IA32_UCODE_REV:
a8d13ea2 1219 case MSR_IA32_PERF_STATUS:
3bab1f5d
AK		 1220 /* MTRR registers */
1221 case 0xfe:
1222 case 0x200 ... 0x2ff:
1223 data = 0;
1224 break;
a8d13ea2
AK		 1225 case 0xcd: /* fsb frequency */
1226 data = 3;
1227 break;
3bab1f5d
AK		 1228 case MSR_IA32_APICBASE:
1229 data = vcpu->apic_base;
1230 break;
6f00e68f
AK		 1231 case MSR_IA32_MISC_ENABLE:
1232 data = vcpu->ia32_misc_enable_msr;
1233 break;
3bab1f5d
AK		 1234#ifdef CONFIG_X86_64
1235 case MSR_EFER:
1236 data = vcpu->shadow_efer;
1237 break;
1238#endif
1239 default:
1240 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1241 return 1;
1242 }
1243 *pdata = data;
1244 return 0;
1245}
1246EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1247
6aa8b732
AK		 1248/*
1249 * Reads an msr value (of 'msr_index') into 'pdata'.
1250 * Returns 0 on success, non-0 otherwise.
1251 * Assumes vcpu_load() was already called.
1252 */
1253static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1254{
1255 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1256}
1257
05b3e0c2 1258#ifdef CONFIG_X86_64
6aa8b732 1259
3bab1f5d 1260static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1261{
6aa8b732
AK		 1262 if (efer & EFER_RESERVED_BITS) {
1263 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1264 efer);
1265 inject_gp(vcpu);
1266 return;
1267 }
1268
1269 if (is_paging(vcpu)
1270 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1271 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1272 inject_gp(vcpu);
1273 return;
1274 }
1275
7725f0ba
AK		 1276 kvm_arch_ops->set_efer(vcpu, efer);
1277
6aa8b732
AK		 1278 efer &= ~EFER_LMA;
1279 efer |= vcpu->shadow_efer & EFER_LMA;
1280
1281 vcpu->shadow_efer = efer;
6aa8b732 1282}
6aa8b732
AK		 1283
1284#endif
1285
3bab1f5d
AK		 1286int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1287{
1288 switch (msr) {
1289#ifdef CONFIG_X86_64
1290 case MSR_EFER:
1291 set_efer(vcpu, data);
1292 break;
1293#endif
1294 case MSR_IA32_MC0_STATUS:
1295 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1296 __FUNCTION__, data);
1297 break;
1298 case MSR_IA32_UCODE_REV:
1299 case MSR_IA32_UCODE_WRITE:
1300 case 0x200 ... 0x2ff: /* MTRRs */
1301 break;
1302 case MSR_IA32_APICBASE:
1303 vcpu->apic_base = data;
1304 break;
6f00e68f
AK		 1305 case MSR_IA32_MISC_ENABLE:
1306 vcpu->ia32_misc_enable_msr = data;
1307 break;
3bab1f5d
AK		 1308 default:
1309 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1310 return 1;
1311 }
1312 return 0;
1313}
1314EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1315
6aa8b732
AK		 1316/*
1317 * Writes msr value into into the appropriate "register".
1318 * Returns 0 on success, non-0 otherwise.
1319 * Assumes vcpu_load() was already called.
1320 */
1321static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1322{
1323 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1324}
1325
1326void kvm_resched(struct kvm_vcpu *vcpu)
1327{
1328 vcpu_put(vcpu);
1329 cond_resched();
1330 /* Cannot fail - no vcpu unplug yet. */
1331 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1332}
1333EXPORT_SYMBOL_GPL(kvm_resched);
1334
1335void load_msrs(struct vmx_msr_entry *e, int n)
1336{
1337 int i;
1338
1339 for (i = 0; i < n; ++i)
1340 wrmsrl(e[i].index, e[i].data);
1341}
1342EXPORT_SYMBOL_GPL(load_msrs);
1343
1344void save_msrs(struct vmx_msr_entry *e, int n)
1345{
1346 int i;
1347
1348 for (i = 0; i < n; ++i)
1349 rdmsrl(e[i].index, e[i].data);
1350}
1351EXPORT_SYMBOL_GPL(save_msrs);
1352
1353static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1354{
1355 struct kvm_vcpu *vcpu;
1356 int r;
1357
5aacf0ca 1358 if (!valid_vcpu(kvm_run->vcpu))
6aa8b732
AK		 1359 return -EINVAL;
1360
1361 vcpu = vcpu_load(kvm, kvm_run->vcpu);
1362 if (!vcpu)
1363 return -ENOENT;
1364
54810342
DL		 1365 /* re-sync apic's tpr */
1366 vcpu->cr8 = kvm_run->cr8;
1367
6aa8b732
AK		 1368 if (kvm_run->emulated) {
1369 kvm_arch_ops->skip_emulated_instruction(vcpu);
1370 kvm_run->emulated = 0;
1371 }
1372
1373 if (kvm_run->mmio_completed) {
1374 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1375 vcpu->mmio_read_completed = 1;
1376 }
1377
1378 vcpu->mmio_needed = 0;
1379
1380 r = kvm_arch_ops->run(vcpu, kvm_run);
1381
1382 vcpu_put(vcpu);
1383 return r;
1384}
1385
1386static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1387{
1388 struct kvm_vcpu *vcpu;
1389
5aacf0ca 1390 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1391 return -EINVAL;
1392
1393 vcpu = vcpu_load(kvm, regs->vcpu);
1394 if (!vcpu)
1395 return -ENOENT;
1396
1397 kvm_arch_ops->cache_regs(vcpu);
1398
1399 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1400 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1401 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1402 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1403 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1404 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1405 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1406 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1407#ifdef CONFIG_X86_64
6aa8b732
AK		 1408 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1409 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1410 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1411 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1412 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1413 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1414 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1415 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1416#endif
1417
1418 regs->rip = vcpu->rip;
1419 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1420
1421 /*
1422 * Don't leak debug flags in case they were set for guest debugging
1423 */
1424 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1425 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1426
1427 vcpu_put(vcpu);
1428
1429 return 0;
1430}
1431
1432static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1433{
1434 struct kvm_vcpu *vcpu;
1435
5aacf0ca 1436 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1437 return -EINVAL;
1438
1439 vcpu = vcpu_load(kvm, regs->vcpu);
1440 if (!vcpu)
1441 return -ENOENT;
1442
1443 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1444 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1445 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1446 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1447 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1448 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1449 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1450 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1451#ifdef CONFIG_X86_64
6aa8b732
AK		 1452 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1453 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1454 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1455 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1456 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1457 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1458 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1459 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1460#endif
1461
1462 vcpu->rip = regs->rip;
1463 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1464
1465 kvm_arch_ops->decache_regs(vcpu);
1466
1467 vcpu_put(vcpu);
1468
1469 return 0;
1470}
1471
1472static void get_segment(struct kvm_vcpu *vcpu,
1473 struct kvm_segment *var, int seg)
1474{
1475 return kvm_arch_ops->get_segment(vcpu, var, seg);
1476}
1477
1478static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1479{
1480 struct kvm_vcpu *vcpu;
1481 struct descriptor_table dt;
1482
5aacf0ca 1483 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1484 return -EINVAL;
1485 vcpu = vcpu_load(kvm, sregs->vcpu);
1486 if (!vcpu)
1487 return -ENOENT;
1488
1489 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1490 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1491 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1492 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1493 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1494 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1495
1496 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1497 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1498
1499 kvm_arch_ops->get_idt(vcpu, &dt);
1500 sregs->idt.limit = dt.limit;
1501 sregs->idt.base = dt.base;
1502 kvm_arch_ops->get_gdt(vcpu, &dt);
1503 sregs->gdt.limit = dt.limit;
1504 sregs->gdt.base = dt.base;
1505
399badf3 1506 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1507 sregs->cr0 = vcpu->cr0;
1508 sregs->cr2 = vcpu->cr2;
1509 sregs->cr3 = vcpu->cr3;
1510 sregs->cr4 = vcpu->cr4;
1511 sregs->cr8 = vcpu->cr8;
1512 sregs->efer = vcpu->shadow_efer;
1513 sregs->apic_base = vcpu->apic_base;
1514
1515 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1516 sizeof sregs->interrupt_bitmap);
1517
1518 vcpu_put(vcpu);
1519
1520 return 0;
1521}
1522
1523static void set_segment(struct kvm_vcpu *vcpu,
1524 struct kvm_segment *var, int seg)
1525{
1526 return kvm_arch_ops->set_segment(vcpu, var, seg);
1527}
1528
1529static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1530{
1531 struct kvm_vcpu *vcpu;
1532 int mmu_reset_needed = 0;
1533 int i;
1534 struct descriptor_table dt;
1535
5aacf0ca 1536 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1537 return -EINVAL;
1538 vcpu = vcpu_load(kvm, sregs->vcpu);
1539 if (!vcpu)
1540 return -ENOENT;
1541
1542 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1543 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1544 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1545 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1546 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1547 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1548
1549 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1550 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1551
1552 dt.limit = sregs->idt.limit;
1553 dt.base = sregs->idt.base;
1554 kvm_arch_ops->set_idt(vcpu, &dt);
1555 dt.limit = sregs->gdt.limit;
1556 dt.base = sregs->gdt.base;
1557 kvm_arch_ops->set_gdt(vcpu, &dt);
1558
1559 vcpu->cr2 = sregs->cr2;
1560 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1561 vcpu->cr3 = sregs->cr3;
1562
1563 vcpu->cr8 = sregs->cr8;
1564
1565 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 1566#ifdef CONFIG_X86_64
6aa8b732
AK		 1567 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1568#endif
1569 vcpu->apic_base = sregs->apic_base;
1570
399badf3
AK		 1571 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1572
6aa8b732
AK		 1573 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1574 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1575
1576 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1577 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 1578 if (!is_long_mode(vcpu) && is_pae(vcpu))
1579 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 1580
1581 if (mmu_reset_needed)
1582 kvm_mmu_reset_context(vcpu);
1583
1584 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1585 sizeof vcpu->irq_pending);
1586 vcpu->irq_summary = 0;
1587 for (i = 0; i < NR_IRQ_WORDS; ++i)
1588 if (vcpu->irq_pending[i])
1589 __set_bit(i, &vcpu->irq_summary);
1590
1591 vcpu_put(vcpu);
1592
1593 return 0;
1594}
1595
1596/*
1597 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1598 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 1599 *
1600 * This list is modified at module load time to reflect the
1601 * capabilities of the host cpu.
6aa8b732
AK		 1602 */
1603static u32 msrs_to_save[] = {
1604 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1605 MSR_K6_STAR,
05b3e0c2 1606#ifdef CONFIG_X86_64
6aa8b732
AK		 1607 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1608#endif
1609 MSR_IA32_TIME_STAMP_COUNTER,
1610};
1611
bf591b24
MR		 1612static unsigned num_msrs_to_save;
1613
6f00e68f
AK		 1614static u32 emulated_msrs[] = {
1615 MSR_IA32_MISC_ENABLE,
1616};
1617
bf591b24
MR		 1618static __init void kvm_init_msr_list(void)
1619{
1620 u32 dummy[2];
1621 unsigned i, j;
1622
1623 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1624 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1625 continue;
1626 if (j < i)
1627 msrs_to_save[j] = msrs_to_save[i];
1628 j++;
1629 }
1630 num_msrs_to_save = j;
1631}
6aa8b732
AK		 1632
1633/*
1634 * Adapt set_msr() to msr_io()'s calling convention
1635 */
1636static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1637{
1638 return set_msr(vcpu, index, *data);
1639}
1640
1641/*
1642 * Read or write a bunch of msrs. All parameters are kernel addresses.
1643 *
1644 * @return number of msrs set successfully.
1645 */
1646static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1647 struct kvm_msr_entry *entries,
1648 int (*do_msr)(struct kvm_vcpu *vcpu,
1649 unsigned index, u64 *data))
1650{
1651 struct kvm_vcpu *vcpu;
1652 int i;
1653
5aacf0ca 1654 if (!valid_vcpu(msrs->vcpu))
6aa8b732
AK		 1655 return -EINVAL;
1656
1657 vcpu = vcpu_load(kvm, msrs->vcpu);
1658 if (!vcpu)
1659 return -ENOENT;
1660
1661 for (i = 0; i < msrs->nmsrs; ++i)
1662 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1663 break;
1664
1665 vcpu_put(vcpu);
1666
1667 return i;
1668}
1669
1670/*
1671 * Read or write a bunch of msrs. Parameters are user addresses.
1672 *
1673 * @return number of msrs set successfully.
1674 */
1675static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1676 int (*do_msr)(struct kvm_vcpu *vcpu,
1677 unsigned index, u64 *data),
1678 int writeback)
1679{
1680 struct kvm_msrs msrs;
1681 struct kvm_msr_entry *entries;
1682 int r, n;
1683 unsigned size;
1684
1685 r = -EFAULT;
1686 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1687 goto out;
1688
1689 r = -E2BIG;
1690 if (msrs.nmsrs >= MAX_IO_MSRS)
1691 goto out;
1692
1693 r = -ENOMEM;
1694 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1695 entries = vmalloc(size);
1696 if (!entries)
1697 goto out;
1698
1699 r = -EFAULT;
1700 if (copy_from_user(entries, user_msrs->entries, size))
1701 goto out_free;
1702
1703 r = n = __msr_io(kvm, &msrs, entries, do_msr);
1704 if (r < 0)
1705 goto out_free;
1706
1707 r = -EFAULT;
1708 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1709 goto out_free;
1710
1711 r = n;
1712
1713out_free:
1714 vfree(entries);
1715out:
1716 return r;
1717}
1718
1719/*
1720 * Translate a guest virtual address to a guest physical address.
1721 */
1722static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1723{
1724 unsigned long vaddr = tr->linear_address;
1725 struct kvm_vcpu *vcpu;
1726 gpa_t gpa;
1727
1728 vcpu = vcpu_load(kvm, tr->vcpu);
1729 if (!vcpu)
1730 return -ENOENT;
1731 spin_lock(&kvm->lock);
1732 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1733 tr->physical_address = gpa;
1734 tr->valid = gpa != UNMAPPED_GVA;
1735 tr->writeable = 1;
1736 tr->usermode = 0;
1737 spin_unlock(&kvm->lock);
1738 vcpu_put(vcpu);
1739
1740 return 0;
1741}
1742
1743static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1744{
1745 struct kvm_vcpu *vcpu;
1746
5aacf0ca 1747 if (!valid_vcpu(irq->vcpu))
6aa8b732
AK		 1748 return -EINVAL;
1749 if (irq->irq < 0 || irq->irq >= 256)
1750 return -EINVAL;
1751 vcpu = vcpu_load(kvm, irq->vcpu);
1752 if (!vcpu)
1753 return -ENOENT;
1754
1755 set_bit(irq->irq, vcpu->irq_pending);
1756 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1757
1758 vcpu_put(vcpu);
1759
1760 return 0;
1761}
1762
1763static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1764 struct kvm_debug_guest *dbg)
1765{
1766 struct kvm_vcpu *vcpu;
1767 int r;
1768
5aacf0ca 1769 if (!valid_vcpu(dbg->vcpu))
6aa8b732
AK		 1770 return -EINVAL;
1771 vcpu = vcpu_load(kvm, dbg->vcpu);
1772 if (!vcpu)
1773 return -ENOENT;
1774
1775 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1776
1777 vcpu_put(vcpu);
1778
1779 return r;
1780}
1781
1782static long kvm_dev_ioctl(struct file *filp,
1783 unsigned int ioctl, unsigned long arg)
1784{
1785 struct kvm *kvm = filp->private_data;
2f366987 1786 void __user *argp = (void __user *)arg;
6aa8b732
AK		 1787 int r = -EINVAL;
1788
1789 switch (ioctl) {
0b76e20b
AK		 1790 case KVM_GET_API_VERSION:
1791 r = KVM_API_VERSION;
1792 break;
6aa8b732
AK		 1793 case KVM_CREATE_VCPU: {
1794 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1795 if (r)
1796 goto out;
1797 break;
1798 }
1799 case KVM_RUN: {
1800 struct kvm_run kvm_run;
1801
1802 r = -EFAULT;
2f366987 1803 if (copy_from_user(&kvm_run, argp, sizeof kvm_run))
6aa8b732
AK		 1804 goto out;
1805 r = kvm_dev_ioctl_run(kvm, &kvm_run);
c1150d8c 1806 if (r < 0 && r != -EINTR)
6aa8b732 1807 goto out;
2f366987 1808 if (copy_to_user(argp, &kvm_run, sizeof kvm_run)) {
c1150d8c 1809 r = -EFAULT;
6aa8b732 1810 goto out;
c1150d8c 1811 }
6aa8b732
AK		 1812 break;
1813 }
1814 case KVM_GET_REGS: {
1815 struct kvm_regs kvm_regs;
1816
1817 r = -EFAULT;
2f366987 1818 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732
AK		 1819 goto out;
1820 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
1821 if (r)
1822 goto out;
1823 r = -EFAULT;
2f366987 1824 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 1825 goto out;
1826 r = 0;
1827 break;
1828 }
1829 case KVM_SET_REGS: {
1830 struct kvm_regs kvm_regs;
1831
1832 r = -EFAULT;
2f366987 1833 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732
AK		 1834 goto out;
1835 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
1836 if (r)
1837 goto out;
1838 r = 0;
1839 break;
1840 }
1841 case KVM_GET_SREGS: {
1842 struct kvm_sregs kvm_sregs;
1843
1844 r = -EFAULT;
2f366987 1845 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732
AK		 1846 goto out;
1847 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
1848 if (r)
1849 goto out;
1850 r = -EFAULT;
2f366987 1851 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 1852 goto out;
1853 r = 0;
1854 break;
1855 }
1856 case KVM_SET_SREGS: {
1857 struct kvm_sregs kvm_sregs;
1858
1859 r = -EFAULT;
2f366987 1860 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732
AK		 1861 goto out;
1862 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
1863 if (r)
1864 goto out;
1865 r = 0;
1866 break;
1867 }
1868 case KVM_TRANSLATE: {
1869 struct kvm_translation tr;
1870
1871 r = -EFAULT;
2f366987 1872 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732
AK		 1873 goto out;
1874 r = kvm_dev_ioctl_translate(kvm, &tr);
1875 if (r)
1876 goto out;
1877 r = -EFAULT;
2f366987 1878 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 1879 goto out;
1880 r = 0;
1881 break;
1882 }
1883 case KVM_INTERRUPT: {
1884 struct kvm_interrupt irq;
1885
1886 r = -EFAULT;
2f366987 1887 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732
AK		 1888 goto out;
1889 r = kvm_dev_ioctl_interrupt(kvm, &irq);
1890 if (r)
1891 goto out;
1892 r = 0;
1893 break;
1894 }
1895 case KVM_DEBUG_GUEST: {
1896 struct kvm_debug_guest dbg;
1897
1898 r = -EFAULT;
2f366987 1899 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732
AK		 1900 goto out;
1901 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
1902 if (r)
1903 goto out;
1904 r = 0;
1905 break;
1906 }
1907 case KVM_SET_MEMORY_REGION: {
1908 struct kvm_memory_region kvm_mem;
1909
1910 r = -EFAULT;
2f366987 1911 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
6aa8b732
AK		 1912 goto out;
1913 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
1914 if (r)
1915 goto out;
1916 break;
1917 }
1918 case KVM_GET_DIRTY_LOG: {
1919 struct kvm_dirty_log log;
1920
1921 r = -EFAULT;
2f366987 1922 if (copy_from_user(&log, argp, sizeof log))
6aa8b732
AK		 1923 goto out;
1924 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
1925 if (r)
1926 goto out;
1927 break;
1928 }
1929 case KVM_GET_MSRS:
2f366987 1930 r = msr_io(kvm, argp, get_msr, 1);
6aa8b732
AK		 1931 break;
1932 case KVM_SET_MSRS:
2f366987 1933 r = msr_io(kvm, argp, do_set_msr, 0);
6aa8b732
AK		 1934 break;
1935 case KVM_GET_MSR_INDEX_LIST: {
2f366987 1936 struct kvm_msr_list __user *user_msr_list = argp;
6aa8b732
AK		 1937 struct kvm_msr_list msr_list;
1938 unsigned n;
1939
1940 r = -EFAULT;
1941 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1942 goto out;
1943 n = msr_list.nmsrs;
6f00e68f 1944 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
6aa8b732
AK		 1945 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1946 goto out;
1947 r = -E2BIG;
bf591b24 1948 if (n < num_msrs_to_save)
6aa8b732
AK		 1949 goto out;
1950 r = -EFAULT;
1951 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 1952 num_msrs_to_save * sizeof(u32)))
6aa8b732 1953 goto out;
6f00e68f
AK		 1954 if (copy_to_user(user_msr_list->indices
1955 + num_msrs_to_save * sizeof(u32),
1956 &emulated_msrs,
1957 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
1958 goto out;
6aa8b732 1959 r = 0;
cc1d8955 1960 break;
6aa8b732
AK		 1961 }
1962 default:
1963 ;
1964 }
1965out:
1966 return r;
1967}
1968
1969static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
1970 unsigned long address,
1971 int *type)
1972{
1973 struct kvm *kvm = vma->vm_file->private_data;
1974 unsigned long pgoff;
1975 struct kvm_memory_slot *slot;
1976 struct page *page;
1977
1978 *type = VM_FAULT_MINOR;
1979 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1980 slot = gfn_to_memslot(kvm, pgoff);
1981 if (!slot)
1982 return NOPAGE_SIGBUS;
1983 page = gfn_to_page(slot, pgoff);
1984 if (!page)
1985 return NOPAGE_SIGBUS;
1986 get_page(page);
1987 return page;
1988}
1989
1990static struct vm_operations_struct kvm_dev_vm_ops = {
1991 .nopage = kvm_dev_nopage,
1992};
1993
1994static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
1995{
1996 vma->vm_ops = &kvm_dev_vm_ops;
1997 return 0;
1998}
1999
2000static struct file_operations kvm_chardev_ops = {
2001 .open = kvm_dev_open,
2002 .release = kvm_dev_release,
2003 .unlocked_ioctl = kvm_dev_ioctl,
2004 .compat_ioctl = kvm_dev_ioctl,
2005 .mmap = kvm_dev_mmap,
2006};
2007
2008static struct miscdevice kvm_dev = {
2009 MISC_DYNAMIC_MINOR,
2010 "kvm",
2011 &kvm_chardev_ops,
2012};
2013
2014static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2015 void *v)
2016{
2017 if (val == SYS_RESTART) {
2018 /*
2019 * Some (well, at least mine) BIOSes hang on reboot if
2020 * in vmx root mode.
2021 */
2022 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
8b6d44c7 2023 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2024 }
2025 return NOTIFY_OK;
2026}
2027
2028static struct notifier_block kvm_reboot_notifier = {
2029 .notifier_call = kvm_reboot,
2030 .priority = 0,
2031};
2032
2033static __init void kvm_init_debug(void)
2034{
2035 struct kvm_stats_debugfs_item *p;
2036
8b6d44c7 2037 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732
AK		 2038 for (p = debugfs_entries; p->name; ++p)
2039 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
2040 p->data);
2041}
2042
2043static void kvm_exit_debug(void)
2044{
2045 struct kvm_stats_debugfs_item *p;
2046
2047 for (p = debugfs_entries; p->name; ++p)
2048 debugfs_remove(p->dentry);
2049 debugfs_remove(debugfs_dir);
2050}
2051
2052hpa_t bad_page_address;
2053
2054int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
2055{
2056 int r;
2057
09db28b8
YI		 2058 if (kvm_arch_ops) {
2059 printk(KERN_ERR "kvm: already loaded the other module\n");
2060 return -EEXIST;
2061 }
2062
e097f35c 2063 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 2064 printk(KERN_ERR "kvm: no hardware support\n");
2065 return -EOPNOTSUPP;
2066 }
e097f35c 2067 if (ops->disabled_by_bios()) {
6aa8b732
AK		 2068 printk(KERN_ERR "kvm: disabled by bios\n");
2069 return -EOPNOTSUPP;
2070 }
2071
e097f35c
YI		 2072 kvm_arch_ops = ops;
2073
6aa8b732
AK		 2074 r = kvm_arch_ops->hardware_setup();
2075 if (r < 0)
2076 return r;
2077
8b6d44c7 2078 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
6aa8b732
AK		 2079 register_reboot_notifier(&kvm_reboot_notifier);
2080
2081 kvm_chardev_ops.owner = module;
2082
2083 r = misc_register(&kvm_dev);
2084 if (r) {
2085 printk (KERN_ERR "kvm: misc device register failed\n");
2086 goto out_free;
2087 }
2088
2089 return r;
2090
2091out_free:
2092 unregister_reboot_notifier(&kvm_reboot_notifier);
8b6d44c7 2093 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2094 kvm_arch_ops->hardware_unsetup();
2095 return r;
2096}
2097
2098void kvm_exit_arch(void)
2099{
2100 misc_deregister(&kvm_dev);
2101
2102 unregister_reboot_notifier(&kvm_reboot_notifier);
8b6d44c7 2103 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 2104 kvm_arch_ops->hardware_unsetup();
09db28b8 2105 kvm_arch_ops = NULL;
6aa8b732
AK		 2106}
2107
2108static __init int kvm_init(void)
2109{
2110 static struct page *bad_page;
2111 int r = 0;
2112
2113 kvm_init_debug();
2114
bf591b24
MR		 2115 kvm_init_msr_list();
2116
6aa8b732
AK		 2117 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2118 r = -ENOMEM;
2119 goto out;
2120 }
2121
2122 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2123 memset(__va(bad_page_address), 0, PAGE_SIZE);
2124
2125 return r;
2126
2127out:
2128 kvm_exit_debug();
2129 return r;
2130}
2131
2132static __exit void kvm_exit(void)
2133{
2134 kvm_exit_debug();
2135 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
2136}
2137
2138module_init(kvm_init)
2139module_exit(kvm_exit)
2140
2141EXPORT_SYMBOL_GPL(kvm_init_arch);
2142EXPORT_SYMBOL_GPL(kvm_exit_arch);