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[PATCH] KVM: SVM: Fix SVM idt confusion
[deliverable/linux.git] / drivers / kvm / kvm_main.c
CommitLineData
6aa8b732
AK		 1/*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
8 *
9 * Authors:
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
12 *
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
15 *
16 */
17
18#include "kvm.h"
19
20#include <linux/kvm.h>
21#include <linux/module.h>
22#include <linux/errno.h>
23#include <asm/processor.h>
24#include <linux/percpu.h>
25#include <linux/gfp.h>
26#include <asm/msr.h>
27#include <linux/mm.h>
28#include <linux/miscdevice.h>
29#include <linux/vmalloc.h>
30#include <asm/uaccess.h>
31#include <linux/reboot.h>
32#include <asm/io.h>
33#include <linux/debugfs.h>
34#include <linux/highmem.h>
35#include <linux/file.h>
36#include <asm/desc.h>
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);
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
260 free->phys_mem = 0;
261 free->npages = 0;
262 free->dirty_bitmap = 0;
263}
264
265static void kvm_free_physmem(struct kvm *kvm)
266{
267 int i;
268
269 for (i = 0; i < kvm->nmemslots; ++i)
270 kvm_free_physmem_slot(&kvm->memslots[i], 0);
271}
272
273static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
274{
08438475 275 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
6aa8b732 276 kvm_mmu_destroy(vcpu);
08438475 277 vcpu_put(vcpu);
9ede74e0 278 kvm_arch_ops->vcpu_free(vcpu);
6aa8b732
AK		 279}
280
281static void kvm_free_vcpus(struct kvm *kvm)
282{
283 unsigned int i;
284
285 for (i = 0; i < KVM_MAX_VCPUS; ++i)
286 kvm_free_vcpu(&kvm->vcpus[i]);
287}
288
289static int kvm_dev_release(struct inode *inode, struct file *filp)
290{
291 struct kvm *kvm = filp->private_data;
292
293 kvm_free_vcpus(kvm);
294 kvm_free_physmem(kvm);
295 kfree(kvm);
296 return 0;
297}
298
299static void inject_gp(struct kvm_vcpu *vcpu)
300{
301 kvm_arch_ops->inject_gp(vcpu, 0);
302}
303
1342d353
AK		 304/*
305 * Load the pae pdptrs. Return true is they are all valid.
306 */
307static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
6aa8b732
AK		 308{
309 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
1342d353 310 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
6aa8b732
AK		 311 int i;
312 u64 pdpte;
313 u64 *pdpt;
1342d353 314 int ret;
6aa8b732
AK		 315 struct kvm_memory_slot *memslot;
316
317 spin_lock(&vcpu->kvm->lock);
318 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
319 /* FIXME: !memslot - emulate? 0xff? */
320 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
321
1342d353 322 ret = 1;
6aa8b732
AK		 323 for (i = 0; i < 4; ++i) {
324 pdpte = pdpt[offset + i];
1342d353
AK		 325 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
326 ret = 0;
327 goto out;
328 }
6aa8b732
AK		 329 }
330
1342d353
AK		 331 for (i = 0; i < 4; ++i)
332 vcpu->pdptrs[i] = pdpt[offset + i];
333
334out:
6aa8b732
AK		 335 kunmap_atomic(pdpt, KM_USER0);
336 spin_unlock(&vcpu->kvm->lock);
337
1342d353 338 return ret;
6aa8b732
AK		 339}
340
341void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
342{
343 if (cr0 & CR0_RESEVED_BITS) {
344 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
345 cr0, vcpu->cr0);
346 inject_gp(vcpu);
347 return;
348 }
349
350 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
351 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
352 inject_gp(vcpu);
353 return;
354 }
355
356 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
357 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
358 "and a clear PE flag\n");
359 inject_gp(vcpu);
360 return;
361 }
362
363 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 364#ifdef CONFIG_X86_64
6aa8b732
AK		 365 if ((vcpu->shadow_efer & EFER_LME)) {
366 int cs_db, cs_l;
367
368 if (!is_pae(vcpu)) {
369 printk(KERN_DEBUG "set_cr0: #GP, start paging "
370 "in long mode while PAE is disabled\n");
371 inject_gp(vcpu);
372 return;
373 }
374 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
375 if (cs_l) {
376 printk(KERN_DEBUG "set_cr0: #GP, start paging "
377 "in long mode while CS.L == 1\n");
378 inject_gp(vcpu);
379 return;
380
381 }
382 } else
383#endif
1342d353 384 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 385 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
386 "reserved bits\n");
387 inject_gp(vcpu);
388 return;
389 }
390
391 }
392
393 kvm_arch_ops->set_cr0(vcpu, cr0);
394 vcpu->cr0 = cr0;
395
396 spin_lock(&vcpu->kvm->lock);
397 kvm_mmu_reset_context(vcpu);
398 spin_unlock(&vcpu->kvm->lock);
399 return;
400}
401EXPORT_SYMBOL_GPL(set_cr0);
402
403void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
404{
399badf3 405 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 406 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
407}
408EXPORT_SYMBOL_GPL(lmsw);
409
410void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
411{
412 if (cr4 & CR4_RESEVED_BITS) {
413 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
414 inject_gp(vcpu);
415 return;
416 }
417
a9058ecd 418 if (is_long_mode(vcpu)) {
6aa8b732
AK		 419 if (!(cr4 & CR4_PAE_MASK)) {
420 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
421 "in long mode\n");
422 inject_gp(vcpu);
423 return;
424 }
425 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
1342d353 426 && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 427 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
428 inject_gp(vcpu);
429 }
430
431 if (cr4 & CR4_VMXE_MASK) {
432 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
433 inject_gp(vcpu);
434 return;
435 }
436 kvm_arch_ops->set_cr4(vcpu, cr4);
437 spin_lock(&vcpu->kvm->lock);
438 kvm_mmu_reset_context(vcpu);
439 spin_unlock(&vcpu->kvm->lock);
440}
441EXPORT_SYMBOL_GPL(set_cr4);
442
443void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
444{
a9058ecd 445 if (is_long_mode(vcpu)) {
6aa8b732
AK		 446 if ( cr3 & CR3_L_MODE_RESEVED_BITS) {
447 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
448 inject_gp(vcpu);
449 return;
450 }
451 } else {
452 if (cr3 & CR3_RESEVED_BITS) {
453 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
454 inject_gp(vcpu);
455 return;
456 }
457 if (is_paging(vcpu) && is_pae(vcpu) &&
1342d353 458 !load_pdptrs(vcpu, cr3)) {
6aa8b732
AK		 459 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
460 "reserved bits\n");
461 inject_gp(vcpu);
462 return;
463 }
464 }
465
466 vcpu->cr3 = cr3;
467 spin_lock(&vcpu->kvm->lock);
d21225ee
IM		 468 /*
469 * Does the new cr3 value map to physical memory? (Note, we
470 * catch an invalid cr3 even in real-mode, because it would
471 * cause trouble later on when we turn on paging anyway.)
472 *
473 * A real CPU would silently accept an invalid cr3 and would
474 * attempt to use it - with largely undefined (and often hard
475 * to debug) behavior on the guest side.
476 */
477 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
478 inject_gp(vcpu);
479 else
480 vcpu->mmu.new_cr3(vcpu);
6aa8b732
AK		 481 spin_unlock(&vcpu->kvm->lock);
482}
483EXPORT_SYMBOL_GPL(set_cr3);
484
485void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
486{
487 if ( cr8 & CR8_RESEVED_BITS) {
488 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
489 inject_gp(vcpu);
490 return;
491 }
492 vcpu->cr8 = cr8;
493}
494EXPORT_SYMBOL_GPL(set_cr8);
495
496void fx_init(struct kvm_vcpu *vcpu)
497{
498 struct __attribute__ ((__packed__)) fx_image_s {
499 u16 control; //fcw
500 u16 status; //fsw
501 u16 tag; // ftw
502 u16 opcode; //fop
503 u64 ip; // fpu ip
504 u64 operand;// fpu dp
505 u32 mxcsr;
506 u32 mxcsr_mask;
507
508 } *fx_image;
509
510 fx_save(vcpu->host_fx_image);
511 fpu_init();
512 fx_save(vcpu->guest_fx_image);
513 fx_restore(vcpu->host_fx_image);
514
515 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
516 fx_image->mxcsr = 0x1f80;
517 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
518 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
519}
520EXPORT_SYMBOL_GPL(fx_init);
521
522/*
523 * Creates some virtual cpus. Good luck creating more than one.
524 */
525static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
526{
527 int r;
528 struct kvm_vcpu *vcpu;
529
530 r = -EINVAL;
5aacf0ca 531 if (!valid_vcpu(n))
6aa8b732
AK		 532 goto out;
533
534 vcpu = &kvm->vcpus[n];
535
536 mutex_lock(&vcpu->mutex);
537
538 if (vcpu->vmcs) {
539 mutex_unlock(&vcpu->mutex);
540 return -EEXIST;
541 }
542
543 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
544 FX_IMAGE_ALIGN);
545 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
546
547 vcpu->cpu = -1; /* First load will set up TR */
6aa8b732
AK		 548 r = kvm_arch_ops->vcpu_create(vcpu);
549 if (r < 0)
550 goto out_free_vcpus;
551
8018c27b
IM		 552 r = kvm_mmu_create(vcpu);
553 if (r < 0)
554 goto out_free_vcpus;
6aa8b732 555
8018c27b
IM		 556 kvm_arch_ops->vcpu_load(vcpu);
557 r = kvm_mmu_setup(vcpu);
6aa8b732 558 if (r >= 0)
8018c27b 559 r = kvm_arch_ops->vcpu_setup(vcpu);
6aa8b732
AK		 560 vcpu_put(vcpu);
561
562 if (r < 0)
563 goto out_free_vcpus;
564
565 return 0;
566
567out_free_vcpus:
568 kvm_free_vcpu(vcpu);
569 mutex_unlock(&vcpu->mutex);
570out:
571 return r;
572}
573
574/*
575 * Allocate some memory and give it an address in the guest physical address
576 * space.
577 *
578 * Discontiguous memory is allowed, mostly for framebuffers.
579 */
580static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm,
581 struct kvm_memory_region *mem)
582{
583 int r;
584 gfn_t base_gfn;
585 unsigned long npages;
586 unsigned long i;
587 struct kvm_memory_slot *memslot;
588 struct kvm_memory_slot old, new;
589 int memory_config_version;
590
591 r = -EINVAL;
592 /* General sanity checks */
593 if (mem->memory_size & (PAGE_SIZE - 1))
594 goto out;
595 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
596 goto out;
597 if (mem->slot >= KVM_MEMORY_SLOTS)
598 goto out;
599 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
600 goto out;
601
602 memslot = &kvm->memslots[mem->slot];
603 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
604 npages = mem->memory_size >> PAGE_SHIFT;
605
606 if (!npages)
607 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
608
609raced:
610 spin_lock(&kvm->lock);
611
612 memory_config_version = kvm->memory_config_version;
613 new = old = *memslot;
614
615 new.base_gfn = base_gfn;
616 new.npages = npages;
617 new.flags = mem->flags;
618
619 /* Disallow changing a memory slot's size. */
620 r = -EINVAL;
621 if (npages && old.npages && npages != old.npages)
622 goto out_unlock;
623
624 /* Check for overlaps */
625 r = -EEXIST;
626 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
627 struct kvm_memory_slot *s = &kvm->memslots[i];
628
629 if (s == memslot)
630 continue;
631 if (!((base_gfn + npages <= s->base_gfn) ||
632 (base_gfn >= s->base_gfn + s->npages)))
633 goto out_unlock;
634 }
635 /*
636 * Do memory allocations outside lock. memory_config_version will
637 * detect any races.
638 */
639 spin_unlock(&kvm->lock);
640
641 /* Deallocate if slot is being removed */
642 if (!npages)
643 new.phys_mem = 0;
644
645 /* Free page dirty bitmap if unneeded */
646 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
647 new.dirty_bitmap = 0;
648
649 r = -ENOMEM;
650
651 /* Allocate if a slot is being created */
652 if (npages && !new.phys_mem) {
653 new.phys_mem = vmalloc(npages * sizeof(struct page *));
654
655 if (!new.phys_mem)
656 goto out_free;
657
658 memset(new.phys_mem, 0, npages * sizeof(struct page *));
659 for (i = 0; i < npages; ++i) {
660 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
661 | __GFP_ZERO);
662 if (!new.phys_mem[i])
663 goto out_free;
cd4a4e53 664 new.phys_mem[i]->private = 0;
6aa8b732
AK		 665 }
666 }
667
668 /* Allocate page dirty bitmap if needed */
669 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
670 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
671
672 new.dirty_bitmap = vmalloc(dirty_bytes);
673 if (!new.dirty_bitmap)
674 goto out_free;
675 memset(new.dirty_bitmap, 0, dirty_bytes);
676 }
677
678 spin_lock(&kvm->lock);
679
680 if (memory_config_version != kvm->memory_config_version) {
681 spin_unlock(&kvm->lock);
682 kvm_free_physmem_slot(&new, &old);
683 goto raced;
684 }
685
686 r = -EAGAIN;
687 if (kvm->busy)
688 goto out_unlock;
689
690 if (mem->slot >= kvm->nmemslots)
691 kvm->nmemslots = mem->slot + 1;
692
693 *memslot = new;
694 ++kvm->memory_config_version;
695
696 spin_unlock(&kvm->lock);
697
698 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
699 struct kvm_vcpu *vcpu;
700
701 vcpu = vcpu_load(kvm, i);
702 if (!vcpu)
703 continue;
704 kvm_mmu_reset_context(vcpu);
705 vcpu_put(vcpu);
706 }
707
708 kvm_free_physmem_slot(&old, &new);
709 return 0;
710
711out_unlock:
712 spin_unlock(&kvm->lock);
713out_free:
714 kvm_free_physmem_slot(&new, &old);
715out:
716 return r;
717}
718
714b93da
AK		 719static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
720{
721 spin_lock(&vcpu->kvm->lock);
722 kvm_mmu_slot_remove_write_access(vcpu, slot);
723 spin_unlock(&vcpu->kvm->lock);
724}
725
6aa8b732
AK		 726/*
727 * Get (and clear) the dirty memory log for a memory slot.
728 */
729static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
730 struct kvm_dirty_log *log)
731{
732 struct kvm_memory_slot *memslot;
733 int r, i;
734 int n;
714b93da 735 int cleared;
6aa8b732
AK		 736 unsigned long any = 0;
737
738 spin_lock(&kvm->lock);
739
740 /*
741 * Prevent changes to guest memory configuration even while the lock
742 * is not taken.
743 */
744 ++kvm->busy;
745 spin_unlock(&kvm->lock);
746 r = -EINVAL;
747 if (log->slot >= KVM_MEMORY_SLOTS)
748 goto out;
749
750 memslot = &kvm->memslots[log->slot];
751 r = -ENOENT;
752 if (!memslot->dirty_bitmap)
753 goto out;
754
755 n = ALIGN(memslot->npages, 8) / 8;
756
757 for (i = 0; !any && i < n; ++i)
758 any = memslot->dirty_bitmap[i];
759
760 r = -EFAULT;
761 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
762 goto out;
763
764
765 if (any) {
714b93da 766 cleared = 0;
6aa8b732
AK		 767 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
768 struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
769
770 if (!vcpu)
771 continue;
714b93da
AK		 772 if (!cleared) {
773 do_remove_write_access(vcpu, log->slot);
774 memset(memslot->dirty_bitmap, 0, n);
775 cleared = 1;
776 }
6aa8b732
AK		 777 kvm_arch_ops->tlb_flush(vcpu);
778 vcpu_put(vcpu);
779 }
780 }
781
782 r = 0;
783
784out:
785 spin_lock(&kvm->lock);
786 --kvm->busy;
787 spin_unlock(&kvm->lock);
788 return r;
789}
790
791struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
792{
793 int i;
794
795 for (i = 0; i < kvm->nmemslots; ++i) {
796 struct kvm_memory_slot *memslot = &kvm->memslots[i];
797
798 if (gfn >= memslot->base_gfn
799 && gfn < memslot->base_gfn + memslot->npages)
800 return memslot;
801 }
802 return 0;
803}
804EXPORT_SYMBOL_GPL(gfn_to_memslot);
805
806void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
807{
808 int i;
809 struct kvm_memory_slot *memslot = 0;
810 unsigned long rel_gfn;
811
812 for (i = 0; i < kvm->nmemslots; ++i) {
813 memslot = &kvm->memslots[i];
814
815 if (gfn >= memslot->base_gfn
816 && gfn < memslot->base_gfn + memslot->npages) {
817
818 if (!memslot || !memslot->dirty_bitmap)
819 return;
820
821 rel_gfn = gfn - memslot->base_gfn;
822
823 /* avoid RMW */
824 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
825 set_bit(rel_gfn, memslot->dirty_bitmap);
826 return;
827 }
828 }
829}
830
831static int emulator_read_std(unsigned long addr,
832 unsigned long *val,
833 unsigned int bytes,
834 struct x86_emulate_ctxt *ctxt)
835{
836 struct kvm_vcpu *vcpu = ctxt->vcpu;
837 void *data = val;
838
839 while (bytes) {
840 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
841 unsigned offset = addr & (PAGE_SIZE-1);
842 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
843 unsigned long pfn;
844 struct kvm_memory_slot *memslot;
845 void *page;
846
847 if (gpa == UNMAPPED_GVA)
848 return X86EMUL_PROPAGATE_FAULT;
849 pfn = gpa >> PAGE_SHIFT;
850 memslot = gfn_to_memslot(vcpu->kvm, pfn);
851 if (!memslot)
852 return X86EMUL_UNHANDLEABLE;
853 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
854
855 memcpy(data, page + offset, tocopy);
856
857 kunmap_atomic(page, KM_USER0);
858
859 bytes -= tocopy;
860 data += tocopy;
861 addr += tocopy;
862 }
863
864 return X86EMUL_CONTINUE;
865}
866
867static int emulator_write_std(unsigned long addr,
868 unsigned long val,
869 unsigned int bytes,
870 struct x86_emulate_ctxt *ctxt)
871{
872 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
873 addr, bytes);
874 return X86EMUL_UNHANDLEABLE;
875}
876
877static int emulator_read_emulated(unsigned long addr,
878 unsigned long *val,
879 unsigned int bytes,
880 struct x86_emulate_ctxt *ctxt)
881{
882 struct kvm_vcpu *vcpu = ctxt->vcpu;
883
884 if (vcpu->mmio_read_completed) {
885 memcpy(val, vcpu->mmio_data, bytes);
886 vcpu->mmio_read_completed = 0;
887 return X86EMUL_CONTINUE;
888 } else if (emulator_read_std(addr, val, bytes, ctxt)
889 == X86EMUL_CONTINUE)
890 return X86EMUL_CONTINUE;
891 else {
892 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
893 if (gpa == UNMAPPED_GVA)
894 return vcpu_printf(vcpu, "not present\n"), X86EMUL_PROPAGATE_FAULT;
895 vcpu->mmio_needed = 1;
896 vcpu->mmio_phys_addr = gpa;
897 vcpu->mmio_size = bytes;
898 vcpu->mmio_is_write = 0;
899
900 return X86EMUL_UNHANDLEABLE;
901 }
902}
903
da4a00f0
AK		 904static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
905 unsigned long val, int bytes)
906{
907 struct kvm_memory_slot *m;
908 struct page *page;
909 void *virt;
910
911 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
912 return 0;
913 m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
914 if (!m)
915 return 0;
916 page = gfn_to_page(m, gpa >> PAGE_SHIFT);
917 kvm_mmu_pre_write(vcpu, gpa, bytes);
918 virt = kmap_atomic(page, KM_USER0);
919 memcpy(virt + offset_in_page(gpa), &val, bytes);
920 kunmap_atomic(virt, KM_USER0);
921 kvm_mmu_post_write(vcpu, gpa, bytes);
922 return 1;
923}
924
6aa8b732
AK		 925static int emulator_write_emulated(unsigned long addr,
926 unsigned long val,
927 unsigned int bytes,
928 struct x86_emulate_ctxt *ctxt)
929{
930 struct kvm_vcpu *vcpu = ctxt->vcpu;
931 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
932
933 if (gpa == UNMAPPED_GVA)
934 return X86EMUL_PROPAGATE_FAULT;
935
da4a00f0
AK		 936 if (emulator_write_phys(vcpu, gpa, val, bytes))
937 return X86EMUL_CONTINUE;
938
6aa8b732
AK		 939 vcpu->mmio_needed = 1;
940 vcpu->mmio_phys_addr = gpa;
941 vcpu->mmio_size = bytes;
942 vcpu->mmio_is_write = 1;
943 memcpy(vcpu->mmio_data, &val, bytes);
944
945 return X86EMUL_CONTINUE;
946}
947
948static int emulator_cmpxchg_emulated(unsigned long addr,
949 unsigned long old,
950 unsigned long new,
951 unsigned int bytes,
952 struct x86_emulate_ctxt *ctxt)
953{
954 static int reported;
955
956 if (!reported) {
957 reported = 1;
958 printk(KERN_WARNING "kvm: emulating exchange as write\n");
959 }
960 return emulator_write_emulated(addr, new, bytes, ctxt);
961}
962
32b35627
AK		 963#ifdef CONFIG_X86_32
964
965static int emulator_cmpxchg8b_emulated(unsigned long addr,
966 unsigned long old_lo,
967 unsigned long old_hi,
968 unsigned long new_lo,
969 unsigned long new_hi,
970 struct x86_emulate_ctxt *ctxt)
971{
972 static int reported;
973 int r;
974
975 if (!reported) {
976 reported = 1;
977 printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
978 }
979 r = emulator_write_emulated(addr, new_lo, 4, ctxt);
980 if (r != X86EMUL_CONTINUE)
981 return r;
982 return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
983}
984
985#endif
986
6aa8b732
AK		 987static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
988{
989 return kvm_arch_ops->get_segment_base(vcpu, seg);
990}
991
992int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
993{
6aa8b732
AK		 994 return X86EMUL_CONTINUE;
995}
996
997int emulate_clts(struct kvm_vcpu *vcpu)
998{
399badf3 999 unsigned long cr0;
6aa8b732 1000
399badf3
AK		 1001 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1002 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
6aa8b732
AK		 1003 kvm_arch_ops->set_cr0(vcpu, cr0);
1004 return X86EMUL_CONTINUE;
1005}
1006
1007int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1008{
1009 struct kvm_vcpu *vcpu = ctxt->vcpu;
1010
1011 switch (dr) {
1012 case 0 ... 3:
1013 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1014 return X86EMUL_CONTINUE;
1015 default:
1016 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1017 __FUNCTION__, dr);
1018 return X86EMUL_UNHANDLEABLE;
1019 }
1020}
1021
1022int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1023{
1024 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1025 int exception;
1026
1027 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1028 if (exception) {
1029 /* FIXME: better handling */
1030 return X86EMUL_UNHANDLEABLE;
1031 }
1032 return X86EMUL_CONTINUE;
1033}
1034
1035static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1036{
1037 static int reported;
1038 u8 opcodes[4];
1039 unsigned long rip = ctxt->vcpu->rip;
1040 unsigned long rip_linear;
1041
1042 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1043
1044 if (reported)
1045 return;
1046
1047 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1048
1049 printk(KERN_ERR "emulation failed but !mmio_needed?"
1050 " rip %lx %02x %02x %02x %02x\n",
1051 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1052 reported = 1;
1053}
1054
1055struct x86_emulate_ops emulate_ops = {
1056 .read_std = emulator_read_std,
1057 .write_std = emulator_write_std,
1058 .read_emulated = emulator_read_emulated,
1059 .write_emulated = emulator_write_emulated,
1060 .cmpxchg_emulated = emulator_cmpxchg_emulated,
32b35627
AK		 1061#ifdef CONFIG_X86_32
1062 .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated,
1063#endif
6aa8b732
AK		 1064};
1065
1066int emulate_instruction(struct kvm_vcpu *vcpu,
1067 struct kvm_run *run,
1068 unsigned long cr2,
1069 u16 error_code)
1070{
1071 struct x86_emulate_ctxt emulate_ctxt;
1072 int r;
1073 int cs_db, cs_l;
1074
1075 kvm_arch_ops->cache_regs(vcpu);
1076
1077 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1078
1079 emulate_ctxt.vcpu = vcpu;
1080 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1081 emulate_ctxt.cr2 = cr2;
1082 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1083 ? X86EMUL_MODE_REAL : cs_l
1084 ? X86EMUL_MODE_PROT64 : cs_db
1085 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1086
1087 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1088 emulate_ctxt.cs_base = 0;
1089 emulate_ctxt.ds_base = 0;
1090 emulate_ctxt.es_base = 0;
1091 emulate_ctxt.ss_base = 0;
1092 } else {
1093 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1094 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1095 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1096 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1097 }
1098
1099 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1100 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1101
1102 vcpu->mmio_is_write = 0;
1103 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1104
1105 if ((r || vcpu->mmio_is_write) && run) {
1106 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1107 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1108 run->mmio.len = vcpu->mmio_size;
1109 run->mmio.is_write = vcpu->mmio_is_write;
1110 }
1111
1112 if (r) {
a436036b
AK		 1113 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1114 return EMULATE_DONE;
6aa8b732
AK		 1115 if (!vcpu->mmio_needed) {
1116 report_emulation_failure(&emulate_ctxt);
1117 return EMULATE_FAIL;
1118 }
1119 return EMULATE_DO_MMIO;
1120 }
1121
1122 kvm_arch_ops->decache_regs(vcpu);
1123 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1124
1125 if (vcpu->mmio_is_write)
1126 return EMULATE_DO_MMIO;
1127
1128 return EMULATE_DONE;
1129}
1130EXPORT_SYMBOL_GPL(emulate_instruction);
1131
1132static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1133{
1134 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1135}
1136
1137void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1138{
1139 struct descriptor_table dt = { limit, base };
1140
1141 kvm_arch_ops->set_gdt(vcpu, &dt);
1142}
1143
1144void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1145{
1146 struct descriptor_table dt = { limit, base };
1147
1148 kvm_arch_ops->set_idt(vcpu, &dt);
1149}
1150
1151void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1152 unsigned long *rflags)
1153{
1154 lmsw(vcpu, msw);
1155 *rflags = kvm_arch_ops->get_rflags(vcpu);
1156}
1157
1158unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1159{
399badf3 1160 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1161 switch (cr) {
1162 case 0:
1163 return vcpu->cr0;
1164 case 2:
1165 return vcpu->cr2;
1166 case 3:
1167 return vcpu->cr3;
1168 case 4:
1169 return vcpu->cr4;
1170 default:
1171 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1172 return 0;
1173 }
1174}
1175
1176void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1177 unsigned long *rflags)
1178{
1179 switch (cr) {
1180 case 0:
1181 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1182 *rflags = kvm_arch_ops->get_rflags(vcpu);
1183 break;
1184 case 2:
1185 vcpu->cr2 = val;
1186 break;
1187 case 3:
1188 set_cr3(vcpu, val);
1189 break;
1190 case 4:
1191 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1192 break;
1193 default:
1194 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1195 }
1196}
1197
3bab1f5d
AK		 1198int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1199{
1200 u64 data;
1201
1202 switch (msr) {
1203 case 0xc0010010: /* SYSCFG */
1204 case 0xc0010015: /* HWCR */
1205 case MSR_IA32_PLATFORM_ID:
1206 case MSR_IA32_P5_MC_ADDR:
1207 case MSR_IA32_P5_MC_TYPE:
1208 case MSR_IA32_MC0_CTL:
1209 case MSR_IA32_MCG_STATUS:
1210 case MSR_IA32_MCG_CAP:
1211 case MSR_IA32_MC0_MISC:
1212 case MSR_IA32_MC0_MISC+4:
1213 case MSR_IA32_MC0_MISC+8:
1214 case MSR_IA32_MC0_MISC+12:
1215 case MSR_IA32_MC0_MISC+16:
1216 case MSR_IA32_UCODE_REV:
a8d13ea2 1217 case MSR_IA32_PERF_STATUS:
3bab1f5d
AK		 1218 /* MTRR registers */
1219 case 0xfe:
1220 case 0x200 ... 0x2ff:
1221 data = 0;
1222 break;
a8d13ea2
AK		 1223 case 0xcd: /* fsb frequency */
1224 data = 3;
1225 break;
3bab1f5d
AK		 1226 case MSR_IA32_APICBASE:
1227 data = vcpu->apic_base;
1228 break;
1229#ifdef CONFIG_X86_64
1230 case MSR_EFER:
1231 data = vcpu->shadow_efer;
1232 break;
1233#endif
1234 default:
1235 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1236 return 1;
1237 }
1238 *pdata = data;
1239 return 0;
1240}
1241EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1242
6aa8b732
AK		 1243/*
1244 * Reads an msr value (of 'msr_index') into 'pdata'.
1245 * Returns 0 on success, non-0 otherwise.
1246 * Assumes vcpu_load() was already called.
1247 */
1248static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1249{
1250 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1251}
1252
05b3e0c2 1253#ifdef CONFIG_X86_64
6aa8b732 1254
3bab1f5d 1255static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1256{
6aa8b732
AK		 1257 if (efer & EFER_RESERVED_BITS) {
1258 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1259 efer);
1260 inject_gp(vcpu);
1261 return;
1262 }
1263
1264 if (is_paging(vcpu)
1265 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1266 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1267 inject_gp(vcpu);
1268 return;
1269 }
1270
7725f0ba
AK		 1271 kvm_arch_ops->set_efer(vcpu, efer);
1272
6aa8b732
AK		 1273 efer &= ~EFER_LMA;
1274 efer |= vcpu->shadow_efer & EFER_LMA;
1275
1276 vcpu->shadow_efer = efer;
6aa8b732 1277}
6aa8b732
AK		 1278
1279#endif
1280
3bab1f5d
AK		 1281int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1282{
1283 switch (msr) {
1284#ifdef CONFIG_X86_64
1285 case MSR_EFER:
1286 set_efer(vcpu, data);
1287 break;
1288#endif
1289 case MSR_IA32_MC0_STATUS:
1290 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1291 __FUNCTION__, data);
1292 break;
1293 case MSR_IA32_UCODE_REV:
1294 case MSR_IA32_UCODE_WRITE:
1295 case 0x200 ... 0x2ff: /* MTRRs */
1296 break;
1297 case MSR_IA32_APICBASE:
1298 vcpu->apic_base = data;
1299 break;
1300 default:
1301 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1302 return 1;
1303 }
1304 return 0;
1305}
1306EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1307
6aa8b732
AK		 1308/*
1309 * Writes msr value into into the appropriate "register".
1310 * Returns 0 on success, non-0 otherwise.
1311 * Assumes vcpu_load() was already called.
1312 */
1313static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1314{
1315 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1316}
1317
1318void kvm_resched(struct kvm_vcpu *vcpu)
1319{
1320 vcpu_put(vcpu);
1321 cond_resched();
1322 /* Cannot fail - no vcpu unplug yet. */
1323 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1324}
1325EXPORT_SYMBOL_GPL(kvm_resched);
1326
1327void load_msrs(struct vmx_msr_entry *e, int n)
1328{
1329 int i;
1330
1331 for (i = 0; i < n; ++i)
1332 wrmsrl(e[i].index, e[i].data);
1333}
1334EXPORT_SYMBOL_GPL(load_msrs);
1335
1336void save_msrs(struct vmx_msr_entry *e, int n)
1337{
1338 int i;
1339
1340 for (i = 0; i < n; ++i)
1341 rdmsrl(e[i].index, e[i].data);
1342}
1343EXPORT_SYMBOL_GPL(save_msrs);
1344
1345static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1346{
1347 struct kvm_vcpu *vcpu;
1348 int r;
1349
5aacf0ca 1350 if (!valid_vcpu(kvm_run->vcpu))
6aa8b732
AK		 1351 return -EINVAL;
1352
1353 vcpu = vcpu_load(kvm, kvm_run->vcpu);
1354 if (!vcpu)
1355 return -ENOENT;
1356
1357 if (kvm_run->emulated) {
1358 kvm_arch_ops->skip_emulated_instruction(vcpu);
1359 kvm_run->emulated = 0;
1360 }
1361
1362 if (kvm_run->mmio_completed) {
1363 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1364 vcpu->mmio_read_completed = 1;
1365 }
1366
1367 vcpu->mmio_needed = 0;
1368
1369 r = kvm_arch_ops->run(vcpu, kvm_run);
1370
1371 vcpu_put(vcpu);
1372 return r;
1373}
1374
1375static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1376{
1377 struct kvm_vcpu *vcpu;
1378
5aacf0ca 1379 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1380 return -EINVAL;
1381
1382 vcpu = vcpu_load(kvm, regs->vcpu);
1383 if (!vcpu)
1384 return -ENOENT;
1385
1386 kvm_arch_ops->cache_regs(vcpu);
1387
1388 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1389 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1390 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1391 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1392 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1393 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1394 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1395 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1396#ifdef CONFIG_X86_64
6aa8b732
AK		 1397 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1398 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1399 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1400 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1401 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1402 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1403 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1404 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1405#endif
1406
1407 regs->rip = vcpu->rip;
1408 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1409
1410 /*
1411 * Don't leak debug flags in case they were set for guest debugging
1412 */
1413 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1414 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1415
1416 vcpu_put(vcpu);
1417
1418 return 0;
1419}
1420
1421static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1422{
1423 struct kvm_vcpu *vcpu;
1424
5aacf0ca 1425 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1426 return -EINVAL;
1427
1428 vcpu = vcpu_load(kvm, regs->vcpu);
1429 if (!vcpu)
1430 return -ENOENT;
1431
1432 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1433 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1434 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1435 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1436 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1437 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1438 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1439 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1440#ifdef CONFIG_X86_64
6aa8b732
AK		 1441 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1442 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1443 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1444 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1445 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1446 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1447 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1448 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1449#endif
1450
1451 vcpu->rip = regs->rip;
1452 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1453
1454 kvm_arch_ops->decache_regs(vcpu);
1455
1456 vcpu_put(vcpu);
1457
1458 return 0;
1459}
1460
1461static void get_segment(struct kvm_vcpu *vcpu,
1462 struct kvm_segment *var, int seg)
1463{
1464 return kvm_arch_ops->get_segment(vcpu, var, seg);
1465}
1466
1467static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1468{
1469 struct kvm_vcpu *vcpu;
1470 struct descriptor_table dt;
1471
5aacf0ca 1472 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1473 return -EINVAL;
1474 vcpu = vcpu_load(kvm, sregs->vcpu);
1475 if (!vcpu)
1476 return -ENOENT;
1477
1478 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1479 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1480 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1481 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1482 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1483 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1484
1485 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1486 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1487
1488 kvm_arch_ops->get_idt(vcpu, &dt);
1489 sregs->idt.limit = dt.limit;
1490 sregs->idt.base = dt.base;
1491 kvm_arch_ops->get_gdt(vcpu, &dt);
1492 sregs->gdt.limit = dt.limit;
1493 sregs->gdt.base = dt.base;
1494
399badf3 1495 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1496 sregs->cr0 = vcpu->cr0;
1497 sregs->cr2 = vcpu->cr2;
1498 sregs->cr3 = vcpu->cr3;
1499 sregs->cr4 = vcpu->cr4;
1500 sregs->cr8 = vcpu->cr8;
1501 sregs->efer = vcpu->shadow_efer;
1502 sregs->apic_base = vcpu->apic_base;
1503
1504 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1505 sizeof sregs->interrupt_bitmap);
1506
1507 vcpu_put(vcpu);
1508
1509 return 0;
1510}
1511
1512static void set_segment(struct kvm_vcpu *vcpu,
1513 struct kvm_segment *var, int seg)
1514{
1515 return kvm_arch_ops->set_segment(vcpu, var, seg);
1516}
1517
1518static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1519{
1520 struct kvm_vcpu *vcpu;
1521 int mmu_reset_needed = 0;
1522 int i;
1523 struct descriptor_table dt;
1524
5aacf0ca 1525 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1526 return -EINVAL;
1527 vcpu = vcpu_load(kvm, sregs->vcpu);
1528 if (!vcpu)
1529 return -ENOENT;
1530
1531 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1532 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1533 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1534 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1535 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1536 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1537
1538 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1539 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1540
1541 dt.limit = sregs->idt.limit;
1542 dt.base = sregs->idt.base;
1543 kvm_arch_ops->set_idt(vcpu, &dt);
1544 dt.limit = sregs->gdt.limit;
1545 dt.base = sregs->gdt.base;
1546 kvm_arch_ops->set_gdt(vcpu, &dt);
1547
1548 vcpu->cr2 = sregs->cr2;
1549 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1550 vcpu->cr3 = sregs->cr3;
1551
1552 vcpu->cr8 = sregs->cr8;
1553
1554 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 1555#ifdef CONFIG_X86_64
6aa8b732
AK		 1556 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1557#endif
1558 vcpu->apic_base = sregs->apic_base;
1559
399badf3
AK		 1560 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1561
6aa8b732
AK		 1562 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1563 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1564
1565 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1566 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 1567 if (!is_long_mode(vcpu) && is_pae(vcpu))
1568 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 1569
1570 if (mmu_reset_needed)
1571 kvm_mmu_reset_context(vcpu);
1572
1573 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1574 sizeof vcpu->irq_pending);
1575 vcpu->irq_summary = 0;
1576 for (i = 0; i < NR_IRQ_WORDS; ++i)
1577 if (vcpu->irq_pending[i])
1578 __set_bit(i, &vcpu->irq_summary);
1579
1580 vcpu_put(vcpu);
1581
1582 return 0;
1583}
1584
1585/*
1586 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1587 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 1588 *
1589 * This list is modified at module load time to reflect the
1590 * capabilities of the host cpu.
6aa8b732
AK		 1591 */
1592static u32 msrs_to_save[] = {
1593 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1594 MSR_K6_STAR,
05b3e0c2 1595#ifdef CONFIG_X86_64
6aa8b732
AK		 1596 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1597#endif
1598 MSR_IA32_TIME_STAMP_COUNTER,
1599};
1600
bf591b24
MR		 1601static unsigned num_msrs_to_save;
1602
1603static __init void kvm_init_msr_list(void)
1604{
1605 u32 dummy[2];
1606 unsigned i, j;
1607
1608 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1609 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1610 continue;
1611 if (j < i)
1612 msrs_to_save[j] = msrs_to_save[i];
1613 j++;
1614 }
1615 num_msrs_to_save = j;
1616}
6aa8b732
AK		 1617
1618/*
1619 * Adapt set_msr() to msr_io()'s calling convention
1620 */
1621static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1622{
1623 return set_msr(vcpu, index, *data);
1624}
1625
1626/*
1627 * Read or write a bunch of msrs. All parameters are kernel addresses.
1628 *
1629 * @return number of msrs set successfully.
1630 */
1631static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1632 struct kvm_msr_entry *entries,
1633 int (*do_msr)(struct kvm_vcpu *vcpu,
1634 unsigned index, u64 *data))
1635{
1636 struct kvm_vcpu *vcpu;
1637 int i;
1638
5aacf0ca 1639 if (!valid_vcpu(msrs->vcpu))
6aa8b732
AK		 1640 return -EINVAL;
1641
1642 vcpu = vcpu_load(kvm, msrs->vcpu);
1643 if (!vcpu)
1644 return -ENOENT;
1645
1646 for (i = 0; i < msrs->nmsrs; ++i)
1647 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1648 break;
1649
1650 vcpu_put(vcpu);
1651
1652 return i;
1653}
1654
1655/*
1656 * Read or write a bunch of msrs. Parameters are user addresses.
1657 *
1658 * @return number of msrs set successfully.
1659 */
1660static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1661 int (*do_msr)(struct kvm_vcpu *vcpu,
1662 unsigned index, u64 *data),
1663 int writeback)
1664{
1665 struct kvm_msrs msrs;
1666 struct kvm_msr_entry *entries;
1667 int r, n;
1668 unsigned size;
1669
1670 r = -EFAULT;
1671 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1672 goto out;
1673
1674 r = -E2BIG;
1675 if (msrs.nmsrs >= MAX_IO_MSRS)
1676 goto out;
1677
1678 r = -ENOMEM;
1679 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1680 entries = vmalloc(size);
1681 if (!entries)
1682 goto out;
1683
1684 r = -EFAULT;
1685 if (copy_from_user(entries, user_msrs->entries, size))
1686 goto out_free;
1687
1688 r = n = __msr_io(kvm, &msrs, entries, do_msr);
1689 if (r < 0)
1690 goto out_free;
1691
1692 r = -EFAULT;
1693 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1694 goto out_free;
1695
1696 r = n;
1697
1698out_free:
1699 vfree(entries);
1700out:
1701 return r;
1702}
1703
1704/*
1705 * Translate a guest virtual address to a guest physical address.
1706 */
1707static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1708{
1709 unsigned long vaddr = tr->linear_address;
1710 struct kvm_vcpu *vcpu;
1711 gpa_t gpa;
1712
1713 vcpu = vcpu_load(kvm, tr->vcpu);
1714 if (!vcpu)
1715 return -ENOENT;
1716 spin_lock(&kvm->lock);
1717 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1718 tr->physical_address = gpa;
1719 tr->valid = gpa != UNMAPPED_GVA;
1720 tr->writeable = 1;
1721 tr->usermode = 0;
1722 spin_unlock(&kvm->lock);
1723 vcpu_put(vcpu);
1724
1725 return 0;
1726}
1727
1728static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1729{
1730 struct kvm_vcpu *vcpu;
1731
5aacf0ca 1732 if (!valid_vcpu(irq->vcpu))
6aa8b732
AK		 1733 return -EINVAL;
1734 if (irq->irq < 0 || irq->irq >= 256)
1735 return -EINVAL;
1736 vcpu = vcpu_load(kvm, irq->vcpu);
1737 if (!vcpu)
1738 return -ENOENT;
1739
1740 set_bit(irq->irq, vcpu->irq_pending);
1741 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1742
1743 vcpu_put(vcpu);
1744
1745 return 0;
1746}
1747
1748static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1749 struct kvm_debug_guest *dbg)
1750{
1751 struct kvm_vcpu *vcpu;
1752 int r;
1753
5aacf0ca 1754 if (!valid_vcpu(dbg->vcpu))
6aa8b732
AK		 1755 return -EINVAL;
1756 vcpu = vcpu_load(kvm, dbg->vcpu);
1757 if (!vcpu)
1758 return -ENOENT;
1759
1760 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1761
1762 vcpu_put(vcpu);
1763
1764 return r;
1765}
1766
1767static long kvm_dev_ioctl(struct file *filp,
1768 unsigned int ioctl, unsigned long arg)
1769{
1770 struct kvm *kvm = filp->private_data;
1771 int r = -EINVAL;
1772
1773 switch (ioctl) {
0b76e20b
AK		 1774 case KVM_GET_API_VERSION:
1775 r = KVM_API_VERSION;
1776 break;
6aa8b732
AK		 1777 case KVM_CREATE_VCPU: {
1778 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1779 if (r)
1780 goto out;
1781 break;
1782 }
1783 case KVM_RUN: {
1784 struct kvm_run kvm_run;
1785
1786 r = -EFAULT;
1787 if (copy_from_user(&kvm_run, (void *)arg, sizeof kvm_run))
1788 goto out;
1789 r = kvm_dev_ioctl_run(kvm, &kvm_run);
c1150d8c 1790 if (r < 0 && r != -EINTR)
6aa8b732 1791 goto out;
c1150d8c
DL		 1792 if (copy_to_user((void *)arg, &kvm_run, sizeof kvm_run)) {
1793 r = -EFAULT;
6aa8b732 1794 goto out;
c1150d8c 1795 }
6aa8b732
AK		 1796 break;
1797 }
1798 case KVM_GET_REGS: {
1799 struct kvm_regs kvm_regs;
1800
1801 r = -EFAULT;
1802 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1803 goto out;
1804 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
1805 if (r)
1806 goto out;
1807 r = -EFAULT;
1808 if (copy_to_user((void *)arg, &kvm_regs, sizeof kvm_regs))
1809 goto out;
1810 r = 0;
1811 break;
1812 }
1813 case KVM_SET_REGS: {
1814 struct kvm_regs kvm_regs;
1815
1816 r = -EFAULT;
1817 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1818 goto out;
1819 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
1820 if (r)
1821 goto out;
1822 r = 0;
1823 break;
1824 }
1825 case KVM_GET_SREGS: {
1826 struct kvm_sregs kvm_sregs;
1827
1828 r = -EFAULT;
1829 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1830 goto out;
1831 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
1832 if (r)
1833 goto out;
1834 r = -EFAULT;
1835 if (copy_to_user((void *)arg, &kvm_sregs, sizeof kvm_sregs))
1836 goto out;
1837 r = 0;
1838 break;
1839 }
1840 case KVM_SET_SREGS: {
1841 struct kvm_sregs kvm_sregs;
1842
1843 r = -EFAULT;
1844 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1845 goto out;
1846 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
1847 if (r)
1848 goto out;
1849 r = 0;
1850 break;
1851 }
1852 case KVM_TRANSLATE: {
1853 struct kvm_translation tr;
1854
1855 r = -EFAULT;
1856 if (copy_from_user(&tr, (void *)arg, sizeof tr))
1857 goto out;
1858 r = kvm_dev_ioctl_translate(kvm, &tr);
1859 if (r)
1860 goto out;
1861 r = -EFAULT;
1862 if (copy_to_user((void *)arg, &tr, sizeof tr))
1863 goto out;
1864 r = 0;
1865 break;
1866 }
1867 case KVM_INTERRUPT: {
1868 struct kvm_interrupt irq;
1869
1870 r = -EFAULT;
1871 if (copy_from_user(&irq, (void *)arg, sizeof irq))
1872 goto out;
1873 r = kvm_dev_ioctl_interrupt(kvm, &irq);
1874 if (r)
1875 goto out;
1876 r = 0;
1877 break;
1878 }
1879 case KVM_DEBUG_GUEST: {
1880 struct kvm_debug_guest dbg;
1881
1882 r = -EFAULT;
1883 if (copy_from_user(&dbg, (void *)arg, sizeof dbg))
1884 goto out;
1885 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
1886 if (r)
1887 goto out;
1888 r = 0;
1889 break;
1890 }
1891 case KVM_SET_MEMORY_REGION: {
1892 struct kvm_memory_region kvm_mem;
1893
1894 r = -EFAULT;
1895 if (copy_from_user(&kvm_mem, (void *)arg, sizeof kvm_mem))
1896 goto out;
1897 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
1898 if (r)
1899 goto out;
1900 break;
1901 }
1902 case KVM_GET_DIRTY_LOG: {
1903 struct kvm_dirty_log log;
1904
1905 r = -EFAULT;
1906 if (copy_from_user(&log, (void *)arg, sizeof log))
1907 goto out;
1908 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
1909 if (r)
1910 goto out;
1911 break;
1912 }
1913 case KVM_GET_MSRS:
1914 r = msr_io(kvm, (void __user *)arg, get_msr, 1);
1915 break;
1916 case KVM_SET_MSRS:
1917 r = msr_io(kvm, (void __user *)arg, do_set_msr, 0);
1918 break;
1919 case KVM_GET_MSR_INDEX_LIST: {
1920 struct kvm_msr_list __user *user_msr_list = (void __user *)arg;
1921 struct kvm_msr_list msr_list;
1922 unsigned n;
1923
1924 r = -EFAULT;
1925 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1926 goto out;
1927 n = msr_list.nmsrs;
bf591b24 1928 msr_list.nmsrs = num_msrs_to_save;
6aa8b732
AK		 1929 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1930 goto out;
1931 r = -E2BIG;
bf591b24 1932 if (n < num_msrs_to_save)
6aa8b732
AK		 1933 goto out;
1934 r = -EFAULT;
1935 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 1936 num_msrs_to_save * sizeof(u32)))
6aa8b732
AK		 1937 goto out;
1938 r = 0;
cc1d8955 1939 break;
6aa8b732
AK		 1940 }
1941 default:
1942 ;
1943 }
1944out:
1945 return r;
1946}
1947
1948static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
1949 unsigned long address,
1950 int *type)
1951{
1952 struct kvm *kvm = vma->vm_file->private_data;
1953 unsigned long pgoff;
1954 struct kvm_memory_slot *slot;
1955 struct page *page;
1956
1957 *type = VM_FAULT_MINOR;
1958 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1959 slot = gfn_to_memslot(kvm, pgoff);
1960 if (!slot)
1961 return NOPAGE_SIGBUS;
1962 page = gfn_to_page(slot, pgoff);
1963 if (!page)
1964 return NOPAGE_SIGBUS;
1965 get_page(page);
1966 return page;
1967}
1968
1969static struct vm_operations_struct kvm_dev_vm_ops = {
1970 .nopage = kvm_dev_nopage,
1971};
1972
1973static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
1974{
1975 vma->vm_ops = &kvm_dev_vm_ops;
1976 return 0;
1977}
1978
1979static struct file_operations kvm_chardev_ops = {
1980 .open = kvm_dev_open,
1981 .release = kvm_dev_release,
1982 .unlocked_ioctl = kvm_dev_ioctl,
1983 .compat_ioctl = kvm_dev_ioctl,
1984 .mmap = kvm_dev_mmap,
1985};
1986
1987static struct miscdevice kvm_dev = {
1988 MISC_DYNAMIC_MINOR,
1989 "kvm",
1990 &kvm_chardev_ops,
1991};
1992
1993static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1994 void *v)
1995{
1996 if (val == SYS_RESTART) {
1997 /*
1998 * Some (well, at least mine) BIOSes hang on reboot if
1999 * in vmx root mode.
2000 */
2001 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2002 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
2003 }
2004 return NOTIFY_OK;
2005}
2006
2007static struct notifier_block kvm_reboot_notifier = {
2008 .notifier_call = kvm_reboot,
2009 .priority = 0,
2010};
2011
2012static __init void kvm_init_debug(void)
2013{
2014 struct kvm_stats_debugfs_item *p;
2015
2016 debugfs_dir = debugfs_create_dir("kvm", 0);
2017 for (p = debugfs_entries; p->name; ++p)
2018 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
2019 p->data);
2020}
2021
2022static void kvm_exit_debug(void)
2023{
2024 struct kvm_stats_debugfs_item *p;
2025
2026 for (p = debugfs_entries; p->name; ++p)
2027 debugfs_remove(p->dentry);
2028 debugfs_remove(debugfs_dir);
2029}
2030
2031hpa_t bad_page_address;
2032
2033int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
2034{
2035 int r;
2036
09db28b8
YI		 2037 if (kvm_arch_ops) {
2038 printk(KERN_ERR "kvm: already loaded the other module\n");
2039 return -EEXIST;
2040 }
2041
e097f35c 2042 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 2043 printk(KERN_ERR "kvm: no hardware support\n");
2044 return -EOPNOTSUPP;
2045 }
e097f35c 2046 if (ops->disabled_by_bios()) {
6aa8b732
AK		 2047 printk(KERN_ERR "kvm: disabled by bios\n");
2048 return -EOPNOTSUPP;
2049 }
2050
e097f35c
YI		 2051 kvm_arch_ops = ops;
2052
6aa8b732
AK		 2053 r = kvm_arch_ops->hardware_setup();
2054 if (r < 0)
2055 return r;
2056
2057 on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1);
2058 register_reboot_notifier(&kvm_reboot_notifier);
2059
2060 kvm_chardev_ops.owner = module;
2061
2062 r = misc_register(&kvm_dev);
2063 if (r) {
2064 printk (KERN_ERR "kvm: misc device register failed\n");
2065 goto out_free;
2066 }
2067
2068 return r;
2069
2070out_free:
2071 unregister_reboot_notifier(&kvm_reboot_notifier);
2072 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
2073 kvm_arch_ops->hardware_unsetup();
2074 return r;
2075}
2076
2077void kvm_exit_arch(void)
2078{
2079 misc_deregister(&kvm_dev);
2080
2081 unregister_reboot_notifier(&kvm_reboot_notifier);
2082 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
2083 kvm_arch_ops->hardware_unsetup();
09db28b8 2084 kvm_arch_ops = NULL;
6aa8b732
AK		 2085}
2086
2087static __init int kvm_init(void)
2088{
2089 static struct page *bad_page;
2090 int r = 0;
2091
2092 kvm_init_debug();
2093
bf591b24
MR		 2094 kvm_init_msr_list();
2095
6aa8b732
AK		 2096 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2097 r = -ENOMEM;
2098 goto out;
2099 }
2100
2101 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2102 memset(__va(bad_page_address), 0, PAGE_SIZE);
2103
2104 return r;
2105
2106out:
2107 kvm_exit_debug();
2108 return r;
2109}
2110
2111static __exit void kvm_exit(void)
2112{
2113 kvm_exit_debug();
2114 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
2115}
2116
2117module_init(kvm_init)
2118module_exit(kvm_exit)
2119
2120EXPORT_SYMBOL_GPL(kvm_init_arch);
2121EXPORT_SYMBOL_GPL(kvm_exit_arch);
Linux kernel - Deliverables
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