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[PATCH] KVM: Implement a few system configuration msrs
[thirdparty/kernel/stable.git] / drivers / kvm / kvm_main.c
CommitLineData
6aa8b732
AK		 1/*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
8 *
9 * Authors:
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
12 *
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
15 *
16 */
17
18#include "kvm.h"
19
20#include <linux/kvm.h>
21#include <linux/module.h>
22#include <linux/errno.h>
23#include <asm/processor.h>
24#include <linux/percpu.h>
25#include <linux/gfp.h>
26#include <asm/msr.h>
27#include <linux/mm.h>
28#include <linux/miscdevice.h>
29#include <linux/vmalloc.h>
30#include <asm/uaccess.h>
31#include <linux/reboot.h>
32#include <asm/io.h>
33#include <linux/debugfs.h>
34#include <linux/highmem.h>
35#include <linux/file.h>
36#include <asm/desc.h>
37
38#include "x86_emulate.h"
39#include "segment_descriptor.h"
40
41MODULE_AUTHOR("Qumranet");
42MODULE_LICENSE("GPL");
43
44struct kvm_arch_ops *kvm_arch_ops;
45struct kvm_stat kvm_stat;
46EXPORT_SYMBOL_GPL(kvm_stat);
47
48static struct kvm_stats_debugfs_item {
49 const char *name;
50 u32 *data;
51 struct dentry *dentry;
52} debugfs_entries[] = {
53 { "pf_fixed", &kvm_stat.pf_fixed },
54 { "pf_guest", &kvm_stat.pf_guest },
55 { "tlb_flush", &kvm_stat.tlb_flush },
56 { "invlpg", &kvm_stat.invlpg },
57 { "exits", &kvm_stat.exits },
58 { "io_exits", &kvm_stat.io_exits },
59 { "mmio_exits", &kvm_stat.mmio_exits },
60 { "signal_exits", &kvm_stat.signal_exits },
61 { "irq_exits", &kvm_stat.irq_exits },
62 { 0, 0 }
63};
64
65static struct dentry *debugfs_dir;
66
67#define MAX_IO_MSRS 256
68
69#define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
70#define LMSW_GUEST_MASK 0x0eULL
71#define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
72#define CR8_RESEVED_BITS (~0x0fULL)
73#define EFER_RESERVED_BITS 0xfffffffffffff2fe
74
05b3e0c2 75#ifdef CONFIG_X86_64
6aa8b732
AK		 76// LDT or TSS descriptor in the GDT. 16 bytes.
77struct segment_descriptor_64 {
78 struct segment_descriptor s;
79 u32 base_higher;
80 u32 pad_zero;
81};
82
83#endif
84
85unsigned long segment_base(u16 selector)
86{
87 struct descriptor_table gdt;
88 struct segment_descriptor *d;
89 unsigned long table_base;
90 typedef unsigned long ul;
91 unsigned long v;
92
93 if (selector == 0)
94 return 0;
95
96 asm ("sgdt %0" : "=m"(gdt));
97 table_base = gdt.base;
98
99 if (selector & 4) { /* from ldt */
100 u16 ldt_selector;
101
102 asm ("sldt %0" : "=g"(ldt_selector));
103 table_base = segment_base(ldt_selector);
104 }
105 d = (struct segment_descriptor *)(table_base + (selector & ~7));
106 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
05b3e0c2 107#ifdef CONFIG_X86_64
6aa8b732
AK		 108 if (d->system == 0
109 && (d->type == 2 || d->type == 9 || d->type == 11))
110 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
111#endif
112 return v;
113}
114EXPORT_SYMBOL_GPL(segment_base);
115
5aacf0ca
JM		 116static inline int valid_vcpu(int n)
117{
118 return likely(n >= 0 && n < KVM_MAX_VCPUS);
119}
120
6aa8b732
AK		 121int kvm_read_guest(struct kvm_vcpu *vcpu,
122 gva_t addr,
123 unsigned long size,
124 void *dest)
125{
126 unsigned char *host_buf = dest;
127 unsigned long req_size = size;
128
129 while (size) {
130 hpa_t paddr;
131 unsigned now;
132 unsigned offset;
133 hva_t guest_buf;
134
135 paddr = gva_to_hpa(vcpu, addr);
136
137 if (is_error_hpa(paddr))
138 break;
139
140 guest_buf = (hva_t)kmap_atomic(
141 pfn_to_page(paddr >> PAGE_SHIFT),
142 KM_USER0);
143 offset = addr & ~PAGE_MASK;
144 guest_buf |= offset;
145 now = min(size, PAGE_SIZE - offset);
146 memcpy(host_buf, (void*)guest_buf, now);
147 host_buf += now;
148 addr += now;
149 size -= now;
150 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
151 }
152 return req_size - size;
153}
154EXPORT_SYMBOL_GPL(kvm_read_guest);
155
156int kvm_write_guest(struct kvm_vcpu *vcpu,
157 gva_t addr,
158 unsigned long size,
159 void *data)
160{
161 unsigned char *host_buf = data;
162 unsigned long req_size = size;
163
164 while (size) {
165 hpa_t paddr;
166 unsigned now;
167 unsigned offset;
168 hva_t guest_buf;
169
170 paddr = gva_to_hpa(vcpu, addr);
171
172 if (is_error_hpa(paddr))
173 break;
174
175 guest_buf = (hva_t)kmap_atomic(
176 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
177 offset = addr & ~PAGE_MASK;
178 guest_buf |= offset;
179 now = min(size, PAGE_SIZE - offset);
180 memcpy((void*)guest_buf, host_buf, now);
181 host_buf += now;
182 addr += now;
183 size -= now;
184 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
185 }
186 return req_size - size;
187}
188EXPORT_SYMBOL_GPL(kvm_write_guest);
189
190static int vcpu_slot(struct kvm_vcpu *vcpu)
191{
192 return vcpu - vcpu->kvm->vcpus;
193}
194
195/*
196 * Switches to specified vcpu, until a matching vcpu_put()
197 */
198static struct kvm_vcpu *vcpu_load(struct kvm *kvm, int vcpu_slot)
199{
200 struct kvm_vcpu *vcpu = &kvm->vcpus[vcpu_slot];
201
202 mutex_lock(&vcpu->mutex);
203 if (unlikely(!vcpu->vmcs)) {
204 mutex_unlock(&vcpu->mutex);
205 return 0;
206 }
207 return kvm_arch_ops->vcpu_load(vcpu);
208}
209
210static void vcpu_put(struct kvm_vcpu *vcpu)
211{
212 kvm_arch_ops->vcpu_put(vcpu);
6aa8b732
AK		 213 mutex_unlock(&vcpu->mutex);
214}
215
216static int kvm_dev_open(struct inode *inode, struct file *filp)
217{
218 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
219 int i;
220
221 if (!kvm)
222 return -ENOMEM;
223
224 spin_lock_init(&kvm->lock);
225 INIT_LIST_HEAD(&kvm->active_mmu_pages);
226 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
227 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
228
229 mutex_init(&vcpu->mutex);
230 vcpu->mmu.root_hpa = INVALID_PAGE;
231 INIT_LIST_HEAD(&vcpu->free_pages);
232 }
233 filp->private_data = kvm;
234 return 0;
235}
236
237/*
238 * Free any memory in @free but not in @dont.
239 */
240static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
241 struct kvm_memory_slot *dont)
242{
243 int i;
244
245 if (!dont || free->phys_mem != dont->phys_mem)
246 if (free->phys_mem) {
247 for (i = 0; i < free->npages; ++i)
248 __free_page(free->phys_mem[i]);
249 vfree(free->phys_mem);
250 }
251
252 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
253 vfree(free->dirty_bitmap);
254
255 free->phys_mem = 0;
256 free->npages = 0;
257 free->dirty_bitmap = 0;
258}
259
260static void kvm_free_physmem(struct kvm *kvm)
261{
262 int i;
263
264 for (i = 0; i < kvm->nmemslots; ++i)
265 kvm_free_physmem_slot(&kvm->memslots[i], 0);
266}
267
268static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
269{
270 kvm_arch_ops->vcpu_free(vcpu);
271 kvm_mmu_destroy(vcpu);
272}
273
274static void kvm_free_vcpus(struct kvm *kvm)
275{
276 unsigned int i;
277
278 for (i = 0; i < KVM_MAX_VCPUS; ++i)
279 kvm_free_vcpu(&kvm->vcpus[i]);
280}
281
282static int kvm_dev_release(struct inode *inode, struct file *filp)
283{
284 struct kvm *kvm = filp->private_data;
285
286 kvm_free_vcpus(kvm);
287 kvm_free_physmem(kvm);
288 kfree(kvm);
289 return 0;
290}
291
292static void inject_gp(struct kvm_vcpu *vcpu)
293{
294 kvm_arch_ops->inject_gp(vcpu, 0);
295}
296
297static int pdptrs_have_reserved_bits_set(struct kvm_vcpu *vcpu,
298 unsigned long cr3)
299{
300 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
301 unsigned offset = (cr3 & (PAGE_SIZE-1)) >> 5;
302 int i;
303 u64 pdpte;
304 u64 *pdpt;
305 struct kvm_memory_slot *memslot;
306
307 spin_lock(&vcpu->kvm->lock);
308 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
309 /* FIXME: !memslot - emulate? 0xff? */
310 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
311
312 for (i = 0; i < 4; ++i) {
313 pdpte = pdpt[offset + i];
314 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull))
315 break;
316 }
317
318 kunmap_atomic(pdpt, KM_USER0);
319 spin_unlock(&vcpu->kvm->lock);
320
321 return i != 4;
322}
323
324void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
325{
326 if (cr0 & CR0_RESEVED_BITS) {
327 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
328 cr0, vcpu->cr0);
329 inject_gp(vcpu);
330 return;
331 }
332
333 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
334 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
335 inject_gp(vcpu);
336 return;
337 }
338
339 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
340 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
341 "and a clear PE flag\n");
342 inject_gp(vcpu);
343 return;
344 }
345
346 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 347#ifdef CONFIG_X86_64
6aa8b732
AK		 348 if ((vcpu->shadow_efer & EFER_LME)) {
349 int cs_db, cs_l;
350
351 if (!is_pae(vcpu)) {
352 printk(KERN_DEBUG "set_cr0: #GP, start paging "
353 "in long mode while PAE is disabled\n");
354 inject_gp(vcpu);
355 return;
356 }
357 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
358 if (cs_l) {
359 printk(KERN_DEBUG "set_cr0: #GP, start paging "
360 "in long mode while CS.L == 1\n");
361 inject_gp(vcpu);
362 return;
363
364 }
365 } else
366#endif
367 if (is_pae(vcpu) &&
368 pdptrs_have_reserved_bits_set(vcpu, vcpu->cr3)) {
369 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
370 "reserved bits\n");
371 inject_gp(vcpu);
372 return;
373 }
374
375 }
376
377 kvm_arch_ops->set_cr0(vcpu, cr0);
378 vcpu->cr0 = cr0;
379
380 spin_lock(&vcpu->kvm->lock);
381 kvm_mmu_reset_context(vcpu);
382 spin_unlock(&vcpu->kvm->lock);
383 return;
384}
385EXPORT_SYMBOL_GPL(set_cr0);
386
387void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
388{
389 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
390}
391EXPORT_SYMBOL_GPL(lmsw);
392
393void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
394{
395 if (cr4 & CR4_RESEVED_BITS) {
396 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
397 inject_gp(vcpu);
398 return;
399 }
400
a9058ecd 401 if (is_long_mode(vcpu)) {
6aa8b732
AK		 402 if (!(cr4 & CR4_PAE_MASK)) {
403 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
404 "in long mode\n");
405 inject_gp(vcpu);
406 return;
407 }
408 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
409 && pdptrs_have_reserved_bits_set(vcpu, vcpu->cr3)) {
410 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
411 inject_gp(vcpu);
412 }
413
414 if (cr4 & CR4_VMXE_MASK) {
415 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
416 inject_gp(vcpu);
417 return;
418 }
419 kvm_arch_ops->set_cr4(vcpu, cr4);
420 spin_lock(&vcpu->kvm->lock);
421 kvm_mmu_reset_context(vcpu);
422 spin_unlock(&vcpu->kvm->lock);
423}
424EXPORT_SYMBOL_GPL(set_cr4);
425
426void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
427{
a9058ecd 428 if (is_long_mode(vcpu)) {
6aa8b732
AK		 429 if ( cr3 & CR3_L_MODE_RESEVED_BITS) {
430 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
431 inject_gp(vcpu);
432 return;
433 }
434 } else {
435 if (cr3 & CR3_RESEVED_BITS) {
436 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
437 inject_gp(vcpu);
438 return;
439 }
440 if (is_paging(vcpu) && is_pae(vcpu) &&
441 pdptrs_have_reserved_bits_set(vcpu, cr3)) {
442 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
443 "reserved bits\n");
444 inject_gp(vcpu);
445 return;
446 }
447 }
448
449 vcpu->cr3 = cr3;
450 spin_lock(&vcpu->kvm->lock);
451 vcpu->mmu.new_cr3(vcpu);
452 spin_unlock(&vcpu->kvm->lock);
453}
454EXPORT_SYMBOL_GPL(set_cr3);
455
456void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
457{
458 if ( cr8 & CR8_RESEVED_BITS) {
459 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
460 inject_gp(vcpu);
461 return;
462 }
463 vcpu->cr8 = cr8;
464}
465EXPORT_SYMBOL_GPL(set_cr8);
466
467void fx_init(struct kvm_vcpu *vcpu)
468{
469 struct __attribute__ ((__packed__)) fx_image_s {
470 u16 control; //fcw
471 u16 status; //fsw
472 u16 tag; // ftw
473 u16 opcode; //fop
474 u64 ip; // fpu ip
475 u64 operand;// fpu dp
476 u32 mxcsr;
477 u32 mxcsr_mask;
478
479 } *fx_image;
480
481 fx_save(vcpu->host_fx_image);
482 fpu_init();
483 fx_save(vcpu->guest_fx_image);
484 fx_restore(vcpu->host_fx_image);
485
486 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
487 fx_image->mxcsr = 0x1f80;
488 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
489 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
490}
491EXPORT_SYMBOL_GPL(fx_init);
492
493/*
494 * Creates some virtual cpus. Good luck creating more than one.
495 */
496static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
497{
498 int r;
499 struct kvm_vcpu *vcpu;
500
501 r = -EINVAL;
5aacf0ca 502 if (!valid_vcpu(n))
6aa8b732
AK		 503 goto out;
504
505 vcpu = &kvm->vcpus[n];
506
507 mutex_lock(&vcpu->mutex);
508
509 if (vcpu->vmcs) {
510 mutex_unlock(&vcpu->mutex);
511 return -EEXIST;
512 }
513
514 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
515 FX_IMAGE_ALIGN);
516 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
517
518 vcpu->cpu = -1; /* First load will set up TR */
519 vcpu->kvm = kvm;
520 r = kvm_arch_ops->vcpu_create(vcpu);
521 if (r < 0)
522 goto out_free_vcpus;
523
524 kvm_arch_ops->vcpu_load(vcpu);
525
526 r = kvm_arch_ops->vcpu_setup(vcpu);
527 if (r >= 0)
528 r = kvm_mmu_init(vcpu);
529
530 vcpu_put(vcpu);
531
532 if (r < 0)
533 goto out_free_vcpus;
534
535 return 0;
536
537out_free_vcpus:
538 kvm_free_vcpu(vcpu);
539 mutex_unlock(&vcpu->mutex);
540out:
541 return r;
542}
543
544/*
545 * Allocate some memory and give it an address in the guest physical address
546 * space.
547 *
548 * Discontiguous memory is allowed, mostly for framebuffers.
549 */
550static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm,
551 struct kvm_memory_region *mem)
552{
553 int r;
554 gfn_t base_gfn;
555 unsigned long npages;
556 unsigned long i;
557 struct kvm_memory_slot *memslot;
558 struct kvm_memory_slot old, new;
559 int memory_config_version;
560
561 r = -EINVAL;
562 /* General sanity checks */
563 if (mem->memory_size & (PAGE_SIZE - 1))
564 goto out;
565 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
566 goto out;
567 if (mem->slot >= KVM_MEMORY_SLOTS)
568 goto out;
569 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
570 goto out;
571
572 memslot = &kvm->memslots[mem->slot];
573 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
574 npages = mem->memory_size >> PAGE_SHIFT;
575
576 if (!npages)
577 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
578
579raced:
580 spin_lock(&kvm->lock);
581
582 memory_config_version = kvm->memory_config_version;
583 new = old = *memslot;
584
585 new.base_gfn = base_gfn;
586 new.npages = npages;
587 new.flags = mem->flags;
588
589 /* Disallow changing a memory slot's size. */
590 r = -EINVAL;
591 if (npages && old.npages && npages != old.npages)
592 goto out_unlock;
593
594 /* Check for overlaps */
595 r = -EEXIST;
596 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
597 struct kvm_memory_slot *s = &kvm->memslots[i];
598
599 if (s == memslot)
600 continue;
601 if (!((base_gfn + npages <= s->base_gfn) ||
602 (base_gfn >= s->base_gfn + s->npages)))
603 goto out_unlock;
604 }
605 /*
606 * Do memory allocations outside lock. memory_config_version will
607 * detect any races.
608 */
609 spin_unlock(&kvm->lock);
610
611 /* Deallocate if slot is being removed */
612 if (!npages)
613 new.phys_mem = 0;
614
615 /* Free page dirty bitmap if unneeded */
616 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
617 new.dirty_bitmap = 0;
618
619 r = -ENOMEM;
620
621 /* Allocate if a slot is being created */
622 if (npages && !new.phys_mem) {
623 new.phys_mem = vmalloc(npages * sizeof(struct page *));
624
625 if (!new.phys_mem)
626 goto out_free;
627
628 memset(new.phys_mem, 0, npages * sizeof(struct page *));
629 for (i = 0; i < npages; ++i) {
630 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
631 | __GFP_ZERO);
632 if (!new.phys_mem[i])
633 goto out_free;
634 }
635 }
636
637 /* Allocate page dirty bitmap if needed */
638 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
639 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
640
641 new.dirty_bitmap = vmalloc(dirty_bytes);
642 if (!new.dirty_bitmap)
643 goto out_free;
644 memset(new.dirty_bitmap, 0, dirty_bytes);
645 }
646
647 spin_lock(&kvm->lock);
648
649 if (memory_config_version != kvm->memory_config_version) {
650 spin_unlock(&kvm->lock);
651 kvm_free_physmem_slot(&new, &old);
652 goto raced;
653 }
654
655 r = -EAGAIN;
656 if (kvm->busy)
657 goto out_unlock;
658
659 if (mem->slot >= kvm->nmemslots)
660 kvm->nmemslots = mem->slot + 1;
661
662 *memslot = new;
663 ++kvm->memory_config_version;
664
665 spin_unlock(&kvm->lock);
666
667 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
668 struct kvm_vcpu *vcpu;
669
670 vcpu = vcpu_load(kvm, i);
671 if (!vcpu)
672 continue;
673 kvm_mmu_reset_context(vcpu);
674 vcpu_put(vcpu);
675 }
676
677 kvm_free_physmem_slot(&old, &new);
678 return 0;
679
680out_unlock:
681 spin_unlock(&kvm->lock);
682out_free:
683 kvm_free_physmem_slot(&new, &old);
684out:
685 return r;
686}
687
688/*
689 * Get (and clear) the dirty memory log for a memory slot.
690 */
691static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
692 struct kvm_dirty_log *log)
693{
694 struct kvm_memory_slot *memslot;
695 int r, i;
696 int n;
697 unsigned long any = 0;
698
699 spin_lock(&kvm->lock);
700
701 /*
702 * Prevent changes to guest memory configuration even while the lock
703 * is not taken.
704 */
705 ++kvm->busy;
706 spin_unlock(&kvm->lock);
707 r = -EINVAL;
708 if (log->slot >= KVM_MEMORY_SLOTS)
709 goto out;
710
711 memslot = &kvm->memslots[log->slot];
712 r = -ENOENT;
713 if (!memslot->dirty_bitmap)
714 goto out;
715
716 n = ALIGN(memslot->npages, 8) / 8;
717
718 for (i = 0; !any && i < n; ++i)
719 any = memslot->dirty_bitmap[i];
720
721 r = -EFAULT;
722 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
723 goto out;
724
725
726 if (any) {
727 spin_lock(&kvm->lock);
728 kvm_mmu_slot_remove_write_access(kvm, log->slot);
729 spin_unlock(&kvm->lock);
730 memset(memslot->dirty_bitmap, 0, n);
731 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
732 struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
733
734 if (!vcpu)
735 continue;
736 kvm_arch_ops->tlb_flush(vcpu);
737 vcpu_put(vcpu);
738 }
739 }
740
741 r = 0;
742
743out:
744 spin_lock(&kvm->lock);
745 --kvm->busy;
746 spin_unlock(&kvm->lock);
747 return r;
748}
749
750struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
751{
752 int i;
753
754 for (i = 0; i < kvm->nmemslots; ++i) {
755 struct kvm_memory_slot *memslot = &kvm->memslots[i];
756
757 if (gfn >= memslot->base_gfn
758 && gfn < memslot->base_gfn + memslot->npages)
759 return memslot;
760 }
761 return 0;
762}
763EXPORT_SYMBOL_GPL(gfn_to_memslot);
764
765void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
766{
767 int i;
768 struct kvm_memory_slot *memslot = 0;
769 unsigned long rel_gfn;
770
771 for (i = 0; i < kvm->nmemslots; ++i) {
772 memslot = &kvm->memslots[i];
773
774 if (gfn >= memslot->base_gfn
775 && gfn < memslot->base_gfn + memslot->npages) {
776
777 if (!memslot || !memslot->dirty_bitmap)
778 return;
779
780 rel_gfn = gfn - memslot->base_gfn;
781
782 /* avoid RMW */
783 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
784 set_bit(rel_gfn, memslot->dirty_bitmap);
785 return;
786 }
787 }
788}
789
790static int emulator_read_std(unsigned long addr,
791 unsigned long *val,
792 unsigned int bytes,
793 struct x86_emulate_ctxt *ctxt)
794{
795 struct kvm_vcpu *vcpu = ctxt->vcpu;
796 void *data = val;
797
798 while (bytes) {
799 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
800 unsigned offset = addr & (PAGE_SIZE-1);
801 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
802 unsigned long pfn;
803 struct kvm_memory_slot *memslot;
804 void *page;
805
806 if (gpa == UNMAPPED_GVA)
807 return X86EMUL_PROPAGATE_FAULT;
808 pfn = gpa >> PAGE_SHIFT;
809 memslot = gfn_to_memslot(vcpu->kvm, pfn);
810 if (!memslot)
811 return X86EMUL_UNHANDLEABLE;
812 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
813
814 memcpy(data, page + offset, tocopy);
815
816 kunmap_atomic(page, KM_USER0);
817
818 bytes -= tocopy;
819 data += tocopy;
820 addr += tocopy;
821 }
822
823 return X86EMUL_CONTINUE;
824}
825
826static int emulator_write_std(unsigned long addr,
827 unsigned long val,
828 unsigned int bytes,
829 struct x86_emulate_ctxt *ctxt)
830{
831 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
832 addr, bytes);
833 return X86EMUL_UNHANDLEABLE;
834}
835
836static int emulator_read_emulated(unsigned long addr,
837 unsigned long *val,
838 unsigned int bytes,
839 struct x86_emulate_ctxt *ctxt)
840{
841 struct kvm_vcpu *vcpu = ctxt->vcpu;
842
843 if (vcpu->mmio_read_completed) {
844 memcpy(val, vcpu->mmio_data, bytes);
845 vcpu->mmio_read_completed = 0;
846 return X86EMUL_CONTINUE;
847 } else if (emulator_read_std(addr, val, bytes, ctxt)
848 == X86EMUL_CONTINUE)
849 return X86EMUL_CONTINUE;
850 else {
851 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
852 if (gpa == UNMAPPED_GVA)
853 return vcpu_printf(vcpu, "not present\n"), X86EMUL_PROPAGATE_FAULT;
854 vcpu->mmio_needed = 1;
855 vcpu->mmio_phys_addr = gpa;
856 vcpu->mmio_size = bytes;
857 vcpu->mmio_is_write = 0;
858
859 return X86EMUL_UNHANDLEABLE;
860 }
861}
862
863static int emulator_write_emulated(unsigned long addr,
864 unsigned long val,
865 unsigned int bytes,
866 struct x86_emulate_ctxt *ctxt)
867{
868 struct kvm_vcpu *vcpu = ctxt->vcpu;
869 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
870
871 if (gpa == UNMAPPED_GVA)
872 return X86EMUL_PROPAGATE_FAULT;
873
874 vcpu->mmio_needed = 1;
875 vcpu->mmio_phys_addr = gpa;
876 vcpu->mmio_size = bytes;
877 vcpu->mmio_is_write = 1;
878 memcpy(vcpu->mmio_data, &val, bytes);
879
880 return X86EMUL_CONTINUE;
881}
882
883static int emulator_cmpxchg_emulated(unsigned long addr,
884 unsigned long old,
885 unsigned long new,
886 unsigned int bytes,
887 struct x86_emulate_ctxt *ctxt)
888{
889 static int reported;
890
891 if (!reported) {
892 reported = 1;
893 printk(KERN_WARNING "kvm: emulating exchange as write\n");
894 }
895 return emulator_write_emulated(addr, new, bytes, ctxt);
896}
897
898static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
899{
900 return kvm_arch_ops->get_segment_base(vcpu, seg);
901}
902
903int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
904{
905 spin_lock(&vcpu->kvm->lock);
906 vcpu->mmu.inval_page(vcpu, address);
907 spin_unlock(&vcpu->kvm->lock);
908 kvm_arch_ops->invlpg(vcpu, address);
909 return X86EMUL_CONTINUE;
910}
911
912int emulate_clts(struct kvm_vcpu *vcpu)
913{
914 unsigned long cr0 = vcpu->cr0;
915
916 cr0 &= ~CR0_TS_MASK;
917 kvm_arch_ops->set_cr0(vcpu, cr0);
918 return X86EMUL_CONTINUE;
919}
920
921int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
922{
923 struct kvm_vcpu *vcpu = ctxt->vcpu;
924
925 switch (dr) {
926 case 0 ... 3:
927 *dest = kvm_arch_ops->get_dr(vcpu, dr);
928 return X86EMUL_CONTINUE;
929 default:
930 printk(KERN_DEBUG "%s: unexpected dr %u\n",
931 __FUNCTION__, dr);
932 return X86EMUL_UNHANDLEABLE;
933 }
934}
935
936int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
937{
938 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
939 int exception;
940
941 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
942 if (exception) {
943 /* FIXME: better handling */
944 return X86EMUL_UNHANDLEABLE;
945 }
946 return X86EMUL_CONTINUE;
947}
948
949static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
950{
951 static int reported;
952 u8 opcodes[4];
953 unsigned long rip = ctxt->vcpu->rip;
954 unsigned long rip_linear;
955
956 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
957
958 if (reported)
959 return;
960
961 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
962
963 printk(KERN_ERR "emulation failed but !mmio_needed?"
964 " rip %lx %02x %02x %02x %02x\n",
965 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
966 reported = 1;
967}
968
969struct x86_emulate_ops emulate_ops = {
970 .read_std = emulator_read_std,
971 .write_std = emulator_write_std,
972 .read_emulated = emulator_read_emulated,
973 .write_emulated = emulator_write_emulated,
974 .cmpxchg_emulated = emulator_cmpxchg_emulated,
975};
976
977int emulate_instruction(struct kvm_vcpu *vcpu,
978 struct kvm_run *run,
979 unsigned long cr2,
980 u16 error_code)
981{
982 struct x86_emulate_ctxt emulate_ctxt;
983 int r;
984 int cs_db, cs_l;
985
986 kvm_arch_ops->cache_regs(vcpu);
987
988 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
989
990 emulate_ctxt.vcpu = vcpu;
991 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
992 emulate_ctxt.cr2 = cr2;
993 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
994 ? X86EMUL_MODE_REAL : cs_l
995 ? X86EMUL_MODE_PROT64 : cs_db
996 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
997
998 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
999 emulate_ctxt.cs_base = 0;
1000 emulate_ctxt.ds_base = 0;
1001 emulate_ctxt.es_base = 0;
1002 emulate_ctxt.ss_base = 0;
1003 } else {
1004 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1005 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1006 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1007 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1008 }
1009
1010 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1011 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1012
1013 vcpu->mmio_is_write = 0;
1014 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1015
1016 if ((r || vcpu->mmio_is_write) && run) {
1017 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1018 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1019 run->mmio.len = vcpu->mmio_size;
1020 run->mmio.is_write = vcpu->mmio_is_write;
1021 }
1022
1023 if (r) {
1024 if (!vcpu->mmio_needed) {
1025 report_emulation_failure(&emulate_ctxt);
1026 return EMULATE_FAIL;
1027 }
1028 return EMULATE_DO_MMIO;
1029 }
1030
1031 kvm_arch_ops->decache_regs(vcpu);
1032 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1033
1034 if (vcpu->mmio_is_write)
1035 return EMULATE_DO_MMIO;
1036
1037 return EMULATE_DONE;
1038}
1039EXPORT_SYMBOL_GPL(emulate_instruction);
1040
1041static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1042{
1043 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1044}
1045
1046void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1047{
1048 struct descriptor_table dt = { limit, base };
1049
1050 kvm_arch_ops->set_gdt(vcpu, &dt);
1051}
1052
1053void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1054{
1055 struct descriptor_table dt = { limit, base };
1056
1057 kvm_arch_ops->set_idt(vcpu, &dt);
1058}
1059
1060void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1061 unsigned long *rflags)
1062{
1063 lmsw(vcpu, msw);
1064 *rflags = kvm_arch_ops->get_rflags(vcpu);
1065}
1066
1067unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1068{
1069 switch (cr) {
1070 case 0:
1071 return vcpu->cr0;
1072 case 2:
1073 return vcpu->cr2;
1074 case 3:
1075 return vcpu->cr3;
1076 case 4:
1077 return vcpu->cr4;
1078 default:
1079 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1080 return 0;
1081 }
1082}
1083
1084void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1085 unsigned long *rflags)
1086{
1087 switch (cr) {
1088 case 0:
1089 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1090 *rflags = kvm_arch_ops->get_rflags(vcpu);
1091 break;
1092 case 2:
1093 vcpu->cr2 = val;
1094 break;
1095 case 3:
1096 set_cr3(vcpu, val);
1097 break;
1098 case 4:
1099 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1100 break;
1101 default:
1102 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1103 }
1104}
1105
1106/*
1107 * Reads an msr value (of 'msr_index') into 'pdata'.
1108 * Returns 0 on success, non-0 otherwise.
1109 * Assumes vcpu_load() was already called.
1110 */
1111static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1112{
1113 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1114}
1115
05b3e0c2 1116#ifdef CONFIG_X86_64
6aa8b732
AK		 1117
1118void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1119{
6aa8b732
AK		 1120 if (efer & EFER_RESERVED_BITS) {
1121 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1122 efer);
1123 inject_gp(vcpu);
1124 return;
1125 }
1126
1127 if (is_paging(vcpu)
1128 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1129 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1130 inject_gp(vcpu);
1131 return;
1132 }
1133
7725f0ba
AK		 1134 kvm_arch_ops->set_efer(vcpu, efer);
1135
6aa8b732
AK		 1136 efer &= ~EFER_LMA;
1137 efer |= vcpu->shadow_efer & EFER_LMA;
1138
1139 vcpu->shadow_efer = efer;
6aa8b732
AK		 1140}
1141EXPORT_SYMBOL_GPL(set_efer);
1142
1143#endif
1144
1145/*
1146 * Writes msr value into into the appropriate "register".
1147 * Returns 0 on success, non-0 otherwise.
1148 * Assumes vcpu_load() was already called.
1149 */
1150static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1151{
1152 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1153}
1154
1155void kvm_resched(struct kvm_vcpu *vcpu)
1156{
1157 vcpu_put(vcpu);
1158 cond_resched();
1159 /* Cannot fail - no vcpu unplug yet. */
1160 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1161}
1162EXPORT_SYMBOL_GPL(kvm_resched);
1163
1164void load_msrs(struct vmx_msr_entry *e, int n)
1165{
1166 int i;
1167
1168 for (i = 0; i < n; ++i)
1169 wrmsrl(e[i].index, e[i].data);
1170}
1171EXPORT_SYMBOL_GPL(load_msrs);
1172
1173void save_msrs(struct vmx_msr_entry *e, int n)
1174{
1175 int i;
1176
1177 for (i = 0; i < n; ++i)
1178 rdmsrl(e[i].index, e[i].data);
1179}
1180EXPORT_SYMBOL_GPL(save_msrs);
1181
1182static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1183{
1184 struct kvm_vcpu *vcpu;
1185 int r;
1186
5aacf0ca 1187 if (!valid_vcpu(kvm_run->vcpu))
6aa8b732
AK		 1188 return -EINVAL;
1189
1190 vcpu = vcpu_load(kvm, kvm_run->vcpu);
1191 if (!vcpu)
1192 return -ENOENT;
1193
1194 if (kvm_run->emulated) {
1195 kvm_arch_ops->skip_emulated_instruction(vcpu);
1196 kvm_run->emulated = 0;
1197 }
1198
1199 if (kvm_run->mmio_completed) {
1200 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1201 vcpu->mmio_read_completed = 1;
1202 }
1203
1204 vcpu->mmio_needed = 0;
1205
1206 r = kvm_arch_ops->run(vcpu, kvm_run);
1207
1208 vcpu_put(vcpu);
1209 return r;
1210}
1211
1212static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1213{
1214 struct kvm_vcpu *vcpu;
1215
5aacf0ca 1216 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1217 return -EINVAL;
1218
1219 vcpu = vcpu_load(kvm, regs->vcpu);
1220 if (!vcpu)
1221 return -ENOENT;
1222
1223 kvm_arch_ops->cache_regs(vcpu);
1224
1225 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1226 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1227 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1228 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1229 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1230 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1231 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1232 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1233#ifdef CONFIG_X86_64
6aa8b732
AK		 1234 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1235 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1236 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1237 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1238 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1239 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1240 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1241 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1242#endif
1243
1244 regs->rip = vcpu->rip;
1245 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1246
1247 /*
1248 * Don't leak debug flags in case they were set for guest debugging
1249 */
1250 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1251 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1252
1253 vcpu_put(vcpu);
1254
1255 return 0;
1256}
1257
1258static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1259{
1260 struct kvm_vcpu *vcpu;
1261
5aacf0ca 1262 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1263 return -EINVAL;
1264
1265 vcpu = vcpu_load(kvm, regs->vcpu);
1266 if (!vcpu)
1267 return -ENOENT;
1268
1269 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1270 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1271 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1272 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1273 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1274 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1275 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1276 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1277#ifdef CONFIG_X86_64
6aa8b732
AK		 1278 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1279 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1280 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1281 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1282 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1283 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1284 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1285 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1286#endif
1287
1288 vcpu->rip = regs->rip;
1289 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1290
1291 kvm_arch_ops->decache_regs(vcpu);
1292
1293 vcpu_put(vcpu);
1294
1295 return 0;
1296}
1297
1298static void get_segment(struct kvm_vcpu *vcpu,
1299 struct kvm_segment *var, int seg)
1300{
1301 return kvm_arch_ops->get_segment(vcpu, var, seg);
1302}
1303
1304static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1305{
1306 struct kvm_vcpu *vcpu;
1307 struct descriptor_table dt;
1308
5aacf0ca 1309 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1310 return -EINVAL;
1311 vcpu = vcpu_load(kvm, sregs->vcpu);
1312 if (!vcpu)
1313 return -ENOENT;
1314
1315 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1316 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1317 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1318 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1319 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1320 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1321
1322 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1323 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1324
1325 kvm_arch_ops->get_idt(vcpu, &dt);
1326 sregs->idt.limit = dt.limit;
1327 sregs->idt.base = dt.base;
1328 kvm_arch_ops->get_gdt(vcpu, &dt);
1329 sregs->gdt.limit = dt.limit;
1330 sregs->gdt.base = dt.base;
1331
1332 sregs->cr0 = vcpu->cr0;
1333 sregs->cr2 = vcpu->cr2;
1334 sregs->cr3 = vcpu->cr3;
1335 sregs->cr4 = vcpu->cr4;
1336 sregs->cr8 = vcpu->cr8;
1337 sregs->efer = vcpu->shadow_efer;
1338 sregs->apic_base = vcpu->apic_base;
1339
1340 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1341 sizeof sregs->interrupt_bitmap);
1342
1343 vcpu_put(vcpu);
1344
1345 return 0;
1346}
1347
1348static void set_segment(struct kvm_vcpu *vcpu,
1349 struct kvm_segment *var, int seg)
1350{
1351 return kvm_arch_ops->set_segment(vcpu, var, seg);
1352}
1353
1354static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1355{
1356 struct kvm_vcpu *vcpu;
1357 int mmu_reset_needed = 0;
1358 int i;
1359 struct descriptor_table dt;
1360
5aacf0ca 1361 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1362 return -EINVAL;
1363 vcpu = vcpu_load(kvm, sregs->vcpu);
1364 if (!vcpu)
1365 return -ENOENT;
1366
1367 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1368 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1369 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1370 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1371 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1372 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1373
1374 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1375 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1376
1377 dt.limit = sregs->idt.limit;
1378 dt.base = sregs->idt.base;
1379 kvm_arch_ops->set_idt(vcpu, &dt);
1380 dt.limit = sregs->gdt.limit;
1381 dt.base = sregs->gdt.base;
1382 kvm_arch_ops->set_gdt(vcpu, &dt);
1383
1384 vcpu->cr2 = sregs->cr2;
1385 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1386 vcpu->cr3 = sregs->cr3;
1387
1388 vcpu->cr8 = sregs->cr8;
1389
1390 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 1391#ifdef CONFIG_X86_64
6aa8b732
AK		 1392 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1393#endif
1394 vcpu->apic_base = sregs->apic_base;
1395
1396 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1397 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1398
1399 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1400 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1401
1402 if (mmu_reset_needed)
1403 kvm_mmu_reset_context(vcpu);
1404
1405 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1406 sizeof vcpu->irq_pending);
1407 vcpu->irq_summary = 0;
1408 for (i = 0; i < NR_IRQ_WORDS; ++i)
1409 if (vcpu->irq_pending[i])
1410 __set_bit(i, &vcpu->irq_summary);
1411
1412 vcpu_put(vcpu);
1413
1414 return 0;
1415}
1416
1417/*
1418 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1419 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 1420 *
1421 * This list is modified at module load time to reflect the
1422 * capabilities of the host cpu.
6aa8b732
AK		 1423 */
1424static u32 msrs_to_save[] = {
1425 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1426 MSR_K6_STAR,
05b3e0c2 1427#ifdef CONFIG_X86_64
6aa8b732
AK		 1428 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1429#endif
1430 MSR_IA32_TIME_STAMP_COUNTER,
1431};
1432
bf591b24
MR		 1433static unsigned num_msrs_to_save;
1434
1435static __init void kvm_init_msr_list(void)
1436{
1437 u32 dummy[2];
1438 unsigned i, j;
1439
1440 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1441 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1442 continue;
1443 if (j < i)
1444 msrs_to_save[j] = msrs_to_save[i];
1445 j++;
1446 }
1447 num_msrs_to_save = j;
1448}
6aa8b732
AK		 1449
1450/*
1451 * Adapt set_msr() to msr_io()'s calling convention
1452 */
1453static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1454{
1455 return set_msr(vcpu, index, *data);
1456}
1457
1458/*
1459 * Read or write a bunch of msrs. All parameters are kernel addresses.
1460 *
1461 * @return number of msrs set successfully.
1462 */
1463static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1464 struct kvm_msr_entry *entries,
1465 int (*do_msr)(struct kvm_vcpu *vcpu,
1466 unsigned index, u64 *data))
1467{
1468 struct kvm_vcpu *vcpu;
1469 int i;
1470
5aacf0ca 1471 if (!valid_vcpu(msrs->vcpu))
6aa8b732
AK		 1472 return -EINVAL;
1473
1474 vcpu = vcpu_load(kvm, msrs->vcpu);
1475 if (!vcpu)
1476 return -ENOENT;
1477
1478 for (i = 0; i < msrs->nmsrs; ++i)
1479 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1480 break;
1481
1482 vcpu_put(vcpu);
1483
1484 return i;
1485}
1486
1487/*
1488 * Read or write a bunch of msrs. Parameters are user addresses.
1489 *
1490 * @return number of msrs set successfully.
1491 */
1492static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1493 int (*do_msr)(struct kvm_vcpu *vcpu,
1494 unsigned index, u64 *data),
1495 int writeback)
1496{
1497 struct kvm_msrs msrs;
1498 struct kvm_msr_entry *entries;
1499 int r, n;
1500 unsigned size;
1501
1502 r = -EFAULT;
1503 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1504 goto out;
1505
1506 r = -E2BIG;
1507 if (msrs.nmsrs >= MAX_IO_MSRS)
1508 goto out;
1509
1510 r = -ENOMEM;
1511 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1512 entries = vmalloc(size);
1513 if (!entries)
1514 goto out;
1515
1516 r = -EFAULT;
1517 if (copy_from_user(entries, user_msrs->entries, size))
1518 goto out_free;
1519
1520 r = n = __msr_io(kvm, &msrs, entries, do_msr);
1521 if (r < 0)
1522 goto out_free;
1523
1524 r = -EFAULT;
1525 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1526 goto out_free;
1527
1528 r = n;
1529
1530out_free:
1531 vfree(entries);
1532out:
1533 return r;
1534}
1535
1536/*
1537 * Translate a guest virtual address to a guest physical address.
1538 */
1539static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1540{
1541 unsigned long vaddr = tr->linear_address;
1542 struct kvm_vcpu *vcpu;
1543 gpa_t gpa;
1544
1545 vcpu = vcpu_load(kvm, tr->vcpu);
1546 if (!vcpu)
1547 return -ENOENT;
1548 spin_lock(&kvm->lock);
1549 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1550 tr->physical_address = gpa;
1551 tr->valid = gpa != UNMAPPED_GVA;
1552 tr->writeable = 1;
1553 tr->usermode = 0;
1554 spin_unlock(&kvm->lock);
1555 vcpu_put(vcpu);
1556
1557 return 0;
1558}
1559
1560static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1561{
1562 struct kvm_vcpu *vcpu;
1563
5aacf0ca 1564 if (!valid_vcpu(irq->vcpu))
6aa8b732
AK		 1565 return -EINVAL;
1566 if (irq->irq < 0 || irq->irq >= 256)
1567 return -EINVAL;
1568 vcpu = vcpu_load(kvm, irq->vcpu);
1569 if (!vcpu)
1570 return -ENOENT;
1571
1572 set_bit(irq->irq, vcpu->irq_pending);
1573 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1574
1575 vcpu_put(vcpu);
1576
1577 return 0;
1578}
1579
1580static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1581 struct kvm_debug_guest *dbg)
1582{
1583 struct kvm_vcpu *vcpu;
1584 int r;
1585
5aacf0ca 1586 if (!valid_vcpu(dbg->vcpu))
6aa8b732
AK		 1587 return -EINVAL;
1588 vcpu = vcpu_load(kvm, dbg->vcpu);
1589 if (!vcpu)
1590 return -ENOENT;
1591
1592 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1593
1594 vcpu_put(vcpu);
1595
1596 return r;
1597}
1598
1599static long kvm_dev_ioctl(struct file *filp,
1600 unsigned int ioctl, unsigned long arg)
1601{
1602 struct kvm *kvm = filp->private_data;
1603 int r = -EINVAL;
1604
1605 switch (ioctl) {
0b76e20b
AK		 1606 case KVM_GET_API_VERSION:
1607 r = KVM_API_VERSION;
1608 break;
6aa8b732
AK		 1609 case KVM_CREATE_VCPU: {
1610 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1611 if (r)
1612 goto out;
1613 break;
1614 }
1615 case KVM_RUN: {
1616 struct kvm_run kvm_run;
1617
1618 r = -EFAULT;
1619 if (copy_from_user(&kvm_run, (void *)arg, sizeof kvm_run))
1620 goto out;
1621 r = kvm_dev_ioctl_run(kvm, &kvm_run);
1622 if (r < 0)
1623 goto out;
1624 r = -EFAULT;
1625 if (copy_to_user((void *)arg, &kvm_run, sizeof kvm_run))
1626 goto out;
1627 r = 0;
1628 break;
1629 }
1630 case KVM_GET_REGS: {
1631 struct kvm_regs kvm_regs;
1632
1633 r = -EFAULT;
1634 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1635 goto out;
1636 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
1637 if (r)
1638 goto out;
1639 r = -EFAULT;
1640 if (copy_to_user((void *)arg, &kvm_regs, sizeof kvm_regs))
1641 goto out;
1642 r = 0;
1643 break;
1644 }
1645 case KVM_SET_REGS: {
1646 struct kvm_regs kvm_regs;
1647
1648 r = -EFAULT;
1649 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1650 goto out;
1651 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
1652 if (r)
1653 goto out;
1654 r = 0;
1655 break;
1656 }
1657 case KVM_GET_SREGS: {
1658 struct kvm_sregs kvm_sregs;
1659
1660 r = -EFAULT;
1661 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1662 goto out;
1663 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
1664 if (r)
1665 goto out;
1666 r = -EFAULT;
1667 if (copy_to_user((void *)arg, &kvm_sregs, sizeof kvm_sregs))
1668 goto out;
1669 r = 0;
1670 break;
1671 }
1672 case KVM_SET_SREGS: {
1673 struct kvm_sregs kvm_sregs;
1674
1675 r = -EFAULT;
1676 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1677 goto out;
1678 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
1679 if (r)
1680 goto out;
1681 r = 0;
1682 break;
1683 }
1684 case KVM_TRANSLATE: {
1685 struct kvm_translation tr;
1686
1687 r = -EFAULT;
1688 if (copy_from_user(&tr, (void *)arg, sizeof tr))
1689 goto out;
1690 r = kvm_dev_ioctl_translate(kvm, &tr);
1691 if (r)
1692 goto out;
1693 r = -EFAULT;
1694 if (copy_to_user((void *)arg, &tr, sizeof tr))
1695 goto out;
1696 r = 0;
1697 break;
1698 }
1699 case KVM_INTERRUPT: {
1700 struct kvm_interrupt irq;
1701
1702 r = -EFAULT;
1703 if (copy_from_user(&irq, (void *)arg, sizeof irq))
1704 goto out;
1705 r = kvm_dev_ioctl_interrupt(kvm, &irq);
1706 if (r)
1707 goto out;
1708 r = 0;
1709 break;
1710 }
1711 case KVM_DEBUG_GUEST: {
1712 struct kvm_debug_guest dbg;
1713
1714 r = -EFAULT;
1715 if (copy_from_user(&dbg, (void *)arg, sizeof dbg))
1716 goto out;
1717 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
1718 if (r)
1719 goto out;
1720 r = 0;
1721 break;
1722 }
1723 case KVM_SET_MEMORY_REGION: {
1724 struct kvm_memory_region kvm_mem;
1725
1726 r = -EFAULT;
1727 if (copy_from_user(&kvm_mem, (void *)arg, sizeof kvm_mem))
1728 goto out;
1729 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
1730 if (r)
1731 goto out;
1732 break;
1733 }
1734 case KVM_GET_DIRTY_LOG: {
1735 struct kvm_dirty_log log;
1736
1737 r = -EFAULT;
1738 if (copy_from_user(&log, (void *)arg, sizeof log))
1739 goto out;
1740 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
1741 if (r)
1742 goto out;
1743 break;
1744 }
1745 case KVM_GET_MSRS:
1746 r = msr_io(kvm, (void __user *)arg, get_msr, 1);
1747 break;
1748 case KVM_SET_MSRS:
1749 r = msr_io(kvm, (void __user *)arg, do_set_msr, 0);
1750 break;
1751 case KVM_GET_MSR_INDEX_LIST: {
1752 struct kvm_msr_list __user *user_msr_list = (void __user *)arg;
1753 struct kvm_msr_list msr_list;
1754 unsigned n;
1755
1756 r = -EFAULT;
1757 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1758 goto out;
1759 n = msr_list.nmsrs;
bf591b24 1760 msr_list.nmsrs = num_msrs_to_save;
6aa8b732
AK		 1761 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1762 goto out;
1763 r = -E2BIG;
bf591b24 1764 if (n < num_msrs_to_save)
6aa8b732
AK		 1765 goto out;
1766 r = -EFAULT;
1767 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 1768 num_msrs_to_save * sizeof(u32)))
6aa8b732
AK		 1769 goto out;
1770 r = 0;
1771 }
1772 default:
1773 ;
1774 }
1775out:
1776 return r;
1777}
1778
1779static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
1780 unsigned long address,
1781 int *type)
1782{
1783 struct kvm *kvm = vma->vm_file->private_data;
1784 unsigned long pgoff;
1785 struct kvm_memory_slot *slot;
1786 struct page *page;
1787
1788 *type = VM_FAULT_MINOR;
1789 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1790 slot = gfn_to_memslot(kvm, pgoff);
1791 if (!slot)
1792 return NOPAGE_SIGBUS;
1793 page = gfn_to_page(slot, pgoff);
1794 if (!page)
1795 return NOPAGE_SIGBUS;
1796 get_page(page);
1797 return page;
1798}
1799
1800static struct vm_operations_struct kvm_dev_vm_ops = {
1801 .nopage = kvm_dev_nopage,
1802};
1803
1804static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
1805{
1806 vma->vm_ops = &kvm_dev_vm_ops;
1807 return 0;
1808}
1809
1810static struct file_operations kvm_chardev_ops = {
1811 .open = kvm_dev_open,
1812 .release = kvm_dev_release,
1813 .unlocked_ioctl = kvm_dev_ioctl,
1814 .compat_ioctl = kvm_dev_ioctl,
1815 .mmap = kvm_dev_mmap,
1816};
1817
1818static struct miscdevice kvm_dev = {
1819 MISC_DYNAMIC_MINOR,
1820 "kvm",
1821 &kvm_chardev_ops,
1822};
1823
1824static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1825 void *v)
1826{
1827 if (val == SYS_RESTART) {
1828 /*
1829 * Some (well, at least mine) BIOSes hang on reboot if
1830 * in vmx root mode.
1831 */
1832 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1833 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1834 }
1835 return NOTIFY_OK;
1836}
1837
1838static struct notifier_block kvm_reboot_notifier = {
1839 .notifier_call = kvm_reboot,
1840 .priority = 0,
1841};
1842
1843static __init void kvm_init_debug(void)
1844{
1845 struct kvm_stats_debugfs_item *p;
1846
1847 debugfs_dir = debugfs_create_dir("kvm", 0);
1848 for (p = debugfs_entries; p->name; ++p)
1849 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
1850 p->data);
1851}
1852
1853static void kvm_exit_debug(void)
1854{
1855 struct kvm_stats_debugfs_item *p;
1856
1857 for (p = debugfs_entries; p->name; ++p)
1858 debugfs_remove(p->dentry);
1859 debugfs_remove(debugfs_dir);
1860}
1861
1862hpa_t bad_page_address;
1863
1864int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
1865{
1866 int r;
1867
09db28b8
YI		 1868 if (kvm_arch_ops) {
1869 printk(KERN_ERR "kvm: already loaded the other module\n");
1870 return -EEXIST;
1871 }
1872
6aa8b732
AK		 1873 kvm_arch_ops = ops;
1874
1875 if (!kvm_arch_ops->cpu_has_kvm_support()) {
1876 printk(KERN_ERR "kvm: no hardware support\n");
1877 return -EOPNOTSUPP;
1878 }
1879 if (kvm_arch_ops->disabled_by_bios()) {
1880 printk(KERN_ERR "kvm: disabled by bios\n");
1881 return -EOPNOTSUPP;
1882 }
1883
1884 r = kvm_arch_ops->hardware_setup();
1885 if (r < 0)
1886 return r;
1887
1888 on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1);
1889 register_reboot_notifier(&kvm_reboot_notifier);
1890
1891 kvm_chardev_ops.owner = module;
1892
1893 r = misc_register(&kvm_dev);
1894 if (r) {
1895 printk (KERN_ERR "kvm: misc device register failed\n");
1896 goto out_free;
1897 }
1898
1899 return r;
1900
1901out_free:
1902 unregister_reboot_notifier(&kvm_reboot_notifier);
1903 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1904 kvm_arch_ops->hardware_unsetup();
1905 return r;
1906}
1907
1908void kvm_exit_arch(void)
1909{
1910 misc_deregister(&kvm_dev);
1911
1912 unregister_reboot_notifier(&kvm_reboot_notifier);
1913 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1914 kvm_arch_ops->hardware_unsetup();
09db28b8 1915 kvm_arch_ops = NULL;
6aa8b732
AK		 1916}
1917
1918static __init int kvm_init(void)
1919{
1920 static struct page *bad_page;
1921 int r = 0;
1922
1923 kvm_init_debug();
1924
bf591b24
MR		 1925 kvm_init_msr_list();
1926
6aa8b732
AK		 1927 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
1928 r = -ENOMEM;
1929 goto out;
1930 }
1931
1932 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
1933 memset(__va(bad_page_address), 0, PAGE_SIZE);
1934
1935 return r;
1936
1937out:
1938 kvm_exit_debug();
1939 return r;
1940}
1941
1942static __exit void kvm_exit(void)
1943{
1944 kvm_exit_debug();
1945 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
1946}
1947
1948module_init(kvm_init)
1949module_exit(kvm_exit)
1950
1951EXPORT_SYMBOL_GPL(kvm_init_arch);
1952EXPORT_SYMBOL_GPL(kvm_exit_arch);
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git