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