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[PATCH] KVM: MMU: Flush guest tlb when reducing permissions on a pte
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / kvm / kvm_main.c
CommitLineData
6aa8b732
AK		 1/*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
8 *
9 * Authors:
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
12 *
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
15 *
16 */
17
18#include "kvm.h"
19
20#include <linux/kvm.h>
21#include <linux/module.h>
22#include <linux/errno.h>
23#include <asm/processor.h>
24#include <linux/percpu.h>
25#include <linux/gfp.h>
26#include <asm/msr.h>
27#include <linux/mm.h>
28#include <linux/miscdevice.h>
29#include <linux/vmalloc.h>
30#include <asm/uaccess.h>
31#include <linux/reboot.h>
32#include <asm/io.h>
33#include <linux/debugfs.h>
34#include <linux/highmem.h>
35#include <linux/file.h>
36#include <asm/desc.h>
37
38#include "x86_emulate.h"
39#include "segment_descriptor.h"
40
41MODULE_AUTHOR("Qumranet");
42MODULE_LICENSE("GPL");
43
44struct kvm_arch_ops *kvm_arch_ops;
45struct kvm_stat kvm_stat;
46EXPORT_SYMBOL_GPL(kvm_stat);
47
48static struct kvm_stats_debugfs_item {
49 const char *name;
50 u32 *data;
51 struct dentry *dentry;
52} debugfs_entries[] = {
53 { "pf_fixed", &kvm_stat.pf_fixed },
54 { "pf_guest", &kvm_stat.pf_guest },
55 { "tlb_flush", &kvm_stat.tlb_flush },
56 { "invlpg", &kvm_stat.invlpg },
57 { "exits", &kvm_stat.exits },
58 { "io_exits", &kvm_stat.io_exits },
59 { "mmio_exits", &kvm_stat.mmio_exits },
60 { "signal_exits", &kvm_stat.signal_exits },
c1150d8c
DL		 61 { "irq_window", &kvm_stat.irq_window_exits },
62 { "halt_exits", &kvm_stat.halt_exits },
63 { "request_irq", &kvm_stat.request_irq_exits },
6aa8b732
AK		 64 { "irq_exits", &kvm_stat.irq_exits },
65 { 0, 0 }
66};
67
68static struct dentry *debugfs_dir;
69
70#define MAX_IO_MSRS 256
71
72#define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
73#define LMSW_GUEST_MASK 0x0eULL
74#define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
75#define CR8_RESEVED_BITS (~0x0fULL)
76#define EFER_RESERVED_BITS 0xfffffffffffff2fe
77
05b3e0c2 78#ifdef CONFIG_X86_64
6aa8b732
AK		 79// LDT or TSS descriptor in the GDT. 16 bytes.
80struct segment_descriptor_64 {
81 struct segment_descriptor s;
82 u32 base_higher;
83 u32 pad_zero;
84};
85
86#endif
87
88unsigned long segment_base(u16 selector)
89{
90 struct descriptor_table gdt;
91 struct segment_descriptor *d;
92 unsigned long table_base;
93 typedef unsigned long ul;
94 unsigned long v;
95
96 if (selector == 0)
97 return 0;
98
99 asm ("sgdt %0" : "=m"(gdt));
100 table_base = gdt.base;
101
102 if (selector & 4) { /* from ldt */
103 u16 ldt_selector;
104
105 asm ("sldt %0" : "=g"(ldt_selector));
106 table_base = segment_base(ldt_selector);
107 }
108 d = (struct segment_descriptor *)(table_base + (selector & ~7));
109 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
05b3e0c2 110#ifdef CONFIG_X86_64
6aa8b732
AK		 111 if (d->system == 0
112 && (d->type == 2 || d->type == 9 || d->type == 11))
113 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
114#endif
115 return v;
116}
117EXPORT_SYMBOL_GPL(segment_base);
118
5aacf0ca
JM		 119static inline int valid_vcpu(int n)
120{
121 return likely(n >= 0 && n < KVM_MAX_VCPUS);
122}
123
6aa8b732
AK		 124int kvm_read_guest(struct kvm_vcpu *vcpu,
125 gva_t addr,
126 unsigned long size,
127 void *dest)
128{
129 unsigned char *host_buf = dest;
130 unsigned long req_size = size;
131
132 while (size) {
133 hpa_t paddr;
134 unsigned now;
135 unsigned offset;
136 hva_t guest_buf;
137
138 paddr = gva_to_hpa(vcpu, addr);
139
140 if (is_error_hpa(paddr))
141 break;
142
143 guest_buf = (hva_t)kmap_atomic(
144 pfn_to_page(paddr >> PAGE_SHIFT),
145 KM_USER0);
146 offset = addr & ~PAGE_MASK;
147 guest_buf |= offset;
148 now = min(size, PAGE_SIZE - offset);
149 memcpy(host_buf, (void*)guest_buf, now);
150 host_buf += now;
151 addr += now;
152 size -= now;
153 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
154 }
155 return req_size - size;
156}
157EXPORT_SYMBOL_GPL(kvm_read_guest);
158
159int kvm_write_guest(struct kvm_vcpu *vcpu,
160 gva_t addr,
161 unsigned long size,
162 void *data)
163{
164 unsigned char *host_buf = data;
165 unsigned long req_size = size;
166
167 while (size) {
168 hpa_t paddr;
169 unsigned now;
170 unsigned offset;
171 hva_t guest_buf;
172
173 paddr = gva_to_hpa(vcpu, addr);
174
175 if (is_error_hpa(paddr))
176 break;
177
178 guest_buf = (hva_t)kmap_atomic(
179 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
180 offset = addr & ~PAGE_MASK;
181 guest_buf |= offset;
182 now = min(size, PAGE_SIZE - offset);
183 memcpy((void*)guest_buf, host_buf, now);
184 host_buf += now;
185 addr += now;
186 size -= now;
187 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
188 }
189 return req_size - size;
190}
191EXPORT_SYMBOL_GPL(kvm_write_guest);
192
193static int vcpu_slot(struct kvm_vcpu *vcpu)
194{
195 return vcpu - vcpu->kvm->vcpus;
196}
197
198/*
199 * Switches to specified vcpu, until a matching vcpu_put()
200 */
201static struct kvm_vcpu *vcpu_load(struct kvm *kvm, int vcpu_slot)
202{
203 struct kvm_vcpu *vcpu = &kvm->vcpus[vcpu_slot];
204
205 mutex_lock(&vcpu->mutex);
206 if (unlikely(!vcpu->vmcs)) {
207 mutex_unlock(&vcpu->mutex);
208 return 0;
209 }
210 return kvm_arch_ops->vcpu_load(vcpu);
211}
212
213static void vcpu_put(struct kvm_vcpu *vcpu)
214{
215 kvm_arch_ops->vcpu_put(vcpu);
6aa8b732
AK		 216 mutex_unlock(&vcpu->mutex);
217}
218
219static int kvm_dev_open(struct inode *inode, struct file *filp)
220{
221 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
222 int i;
223
224 if (!kvm)
225 return -ENOMEM;
226
227 spin_lock_init(&kvm->lock);
228 INIT_LIST_HEAD(&kvm->active_mmu_pages);
229 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
230 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
231
232 mutex_init(&vcpu->mutex);
233 vcpu->mmu.root_hpa = INVALID_PAGE;
234 INIT_LIST_HEAD(&vcpu->free_pages);
235 }
236 filp->private_data = kvm;
237 return 0;
238}
239
240/*
241 * Free any memory in @free but not in @dont.
242 */
243static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
244 struct kvm_memory_slot *dont)
245{
246 int i;
247
248 if (!dont || free->phys_mem != dont->phys_mem)
249 if (free->phys_mem) {
250 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 251 if (free->phys_mem[i])
252 __free_page(free->phys_mem[i]);
6aa8b732
AK		 253 vfree(free->phys_mem);
254 }
255
256 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
257 vfree(free->dirty_bitmap);
258
259 free->phys_mem = 0;
260 free->npages = 0;
261 free->dirty_bitmap = 0;
262}
263
264static void kvm_free_physmem(struct kvm *kvm)
265{
266 int i;
267
268 for (i = 0; i < kvm->nmemslots; ++i)
269 kvm_free_physmem_slot(&kvm->memslots[i], 0);
270}
271
272static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
273{
274 kvm_arch_ops->vcpu_free(vcpu);
275 kvm_mmu_destroy(vcpu);
276}
277
278static void kvm_free_vcpus(struct kvm *kvm)
279{
280 unsigned int i;
281
282 for (i = 0; i < KVM_MAX_VCPUS; ++i)
283 kvm_free_vcpu(&kvm->vcpus[i]);
284}
285
286static int kvm_dev_release(struct inode *inode, struct file *filp)
287{
288 struct kvm *kvm = filp->private_data;
289
290 kvm_free_vcpus(kvm);
291 kvm_free_physmem(kvm);
292 kfree(kvm);
293 return 0;
294}
295
296static void inject_gp(struct kvm_vcpu *vcpu)
297{
298 kvm_arch_ops->inject_gp(vcpu, 0);
299}
300
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
714b93da
AK		 705static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
706{
707 spin_lock(&vcpu->kvm->lock);
708 kvm_mmu_slot_remove_write_access(vcpu, slot);
709 spin_unlock(&vcpu->kvm->lock);
710}
711
6aa8b732
AK		 712/*
713 * Get (and clear) the dirty memory log for a memory slot.
714 */
715static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
716 struct kvm_dirty_log *log)
717{
718 struct kvm_memory_slot *memslot;
719 int r, i;
720 int n;
714b93da 721 int cleared;
6aa8b732
AK		 722 unsigned long any = 0;
723
724 spin_lock(&kvm->lock);
725
726 /*
727 * Prevent changes to guest memory configuration even while the lock
728 * is not taken.
729 */
730 ++kvm->busy;
731 spin_unlock(&kvm->lock);
732 r = -EINVAL;
733 if (log->slot >= KVM_MEMORY_SLOTS)
734 goto out;
735
736 memslot = &kvm->memslots[log->slot];
737 r = -ENOENT;
738 if (!memslot->dirty_bitmap)
739 goto out;
740
741 n = ALIGN(memslot->npages, 8) / 8;
742
743 for (i = 0; !any && i < n; ++i)
744 any = memslot->dirty_bitmap[i];
745
746 r = -EFAULT;
747 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
748 goto out;
749
750
751 if (any) {
714b93da 752 cleared = 0;
6aa8b732
AK		 753 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
754 struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
755
756 if (!vcpu)
757 continue;
714b93da
AK		 758 if (!cleared) {
759 do_remove_write_access(vcpu, log->slot);
760 memset(memslot->dirty_bitmap, 0, n);
761 cleared = 1;
762 }
6aa8b732
AK		 763 kvm_arch_ops->tlb_flush(vcpu);
764 vcpu_put(vcpu);
765 }
766 }
767
768 r = 0;
769
770out:
771 spin_lock(&kvm->lock);
772 --kvm->busy;
773 spin_unlock(&kvm->lock);
774 return r;
775}
776
777struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
778{
779 int i;
780
781 for (i = 0; i < kvm->nmemslots; ++i) {
782 struct kvm_memory_slot *memslot = &kvm->memslots[i];
783
784 if (gfn >= memslot->base_gfn
785 && gfn < memslot->base_gfn + memslot->npages)
786 return memslot;
787 }
788 return 0;
789}
790EXPORT_SYMBOL_GPL(gfn_to_memslot);
791
792void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
793{
794 int i;
795 struct kvm_memory_slot *memslot = 0;
796 unsigned long rel_gfn;
797
798 for (i = 0; i < kvm->nmemslots; ++i) {
799 memslot = &kvm->memslots[i];
800
801 if (gfn >= memslot->base_gfn
802 && gfn < memslot->base_gfn + memslot->npages) {
803
804 if (!memslot || !memslot->dirty_bitmap)
805 return;
806
807 rel_gfn = gfn - memslot->base_gfn;
808
809 /* avoid RMW */
810 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
811 set_bit(rel_gfn, memslot->dirty_bitmap);
812 return;
813 }
814 }
815}
816
817static int emulator_read_std(unsigned long addr,
818 unsigned long *val,
819 unsigned int bytes,
820 struct x86_emulate_ctxt *ctxt)
821{
822 struct kvm_vcpu *vcpu = ctxt->vcpu;
823 void *data = val;
824
825 while (bytes) {
826 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
827 unsigned offset = addr & (PAGE_SIZE-1);
828 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
829 unsigned long pfn;
830 struct kvm_memory_slot *memslot;
831 void *page;
832
833 if (gpa == UNMAPPED_GVA)
834 return X86EMUL_PROPAGATE_FAULT;
835 pfn = gpa >> PAGE_SHIFT;
836 memslot = gfn_to_memslot(vcpu->kvm, pfn);
837 if (!memslot)
838 return X86EMUL_UNHANDLEABLE;
839 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
840
841 memcpy(data, page + offset, tocopy);
842
843 kunmap_atomic(page, KM_USER0);
844
845 bytes -= tocopy;
846 data += tocopy;
847 addr += tocopy;
848 }
849
850 return X86EMUL_CONTINUE;
851}
852
853static int emulator_write_std(unsigned long addr,
854 unsigned long val,
855 unsigned int bytes,
856 struct x86_emulate_ctxt *ctxt)
857{
858 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
859 addr, bytes);
860 return X86EMUL_UNHANDLEABLE;
861}
862
863static int emulator_read_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
870 if (vcpu->mmio_read_completed) {
871 memcpy(val, vcpu->mmio_data, bytes);
872 vcpu->mmio_read_completed = 0;
873 return X86EMUL_CONTINUE;
874 } else if (emulator_read_std(addr, val, bytes, ctxt)
875 == X86EMUL_CONTINUE)
876 return X86EMUL_CONTINUE;
877 else {
878 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
879 if (gpa == UNMAPPED_GVA)
880 return vcpu_printf(vcpu, "not present\n"), X86EMUL_PROPAGATE_FAULT;
881 vcpu->mmio_needed = 1;
882 vcpu->mmio_phys_addr = gpa;
883 vcpu->mmio_size = bytes;
884 vcpu->mmio_is_write = 0;
885
886 return X86EMUL_UNHANDLEABLE;
887 }
888}
889
da4a00f0
AK		 890static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
891 unsigned long val, int bytes)
892{
893 struct kvm_memory_slot *m;
894 struct page *page;
895 void *virt;
896
897 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
898 return 0;
899 m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
900 if (!m)
901 return 0;
902 page = gfn_to_page(m, gpa >> PAGE_SHIFT);
903 kvm_mmu_pre_write(vcpu, gpa, bytes);
904 virt = kmap_atomic(page, KM_USER0);
905 memcpy(virt + offset_in_page(gpa), &val, bytes);
906 kunmap_atomic(virt, KM_USER0);
907 kvm_mmu_post_write(vcpu, gpa, bytes);
908 return 1;
909}
910
6aa8b732
AK		 911static int emulator_write_emulated(unsigned long addr,
912 unsigned long val,
913 unsigned int bytes,
914 struct x86_emulate_ctxt *ctxt)
915{
916 struct kvm_vcpu *vcpu = ctxt->vcpu;
917 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
918
919 if (gpa == UNMAPPED_GVA)
920 return X86EMUL_PROPAGATE_FAULT;
921
da4a00f0
AK		 922 if (emulator_write_phys(vcpu, gpa, val, bytes))
923 return X86EMUL_CONTINUE;
924
6aa8b732
AK		 925 vcpu->mmio_needed = 1;
926 vcpu->mmio_phys_addr = gpa;
927 vcpu->mmio_size = bytes;
928 vcpu->mmio_is_write = 1;
929 memcpy(vcpu->mmio_data, &val, bytes);
930
931 return X86EMUL_CONTINUE;
932}
933
934static int emulator_cmpxchg_emulated(unsigned long addr,
935 unsigned long old,
936 unsigned long new,
937 unsigned int bytes,
938 struct x86_emulate_ctxt *ctxt)
939{
940 static int reported;
941
942 if (!reported) {
943 reported = 1;
944 printk(KERN_WARNING "kvm: emulating exchange as write\n");
945 }
946 return emulator_write_emulated(addr, new, bytes, ctxt);
947}
948
32b35627
AK		 949#ifdef CONFIG_X86_32
950
951static int emulator_cmpxchg8b_emulated(unsigned long addr,
952 unsigned long old_lo,
953 unsigned long old_hi,
954 unsigned long new_lo,
955 unsigned long new_hi,
956 struct x86_emulate_ctxt *ctxt)
957{
958 static int reported;
959 int r;
960
961 if (!reported) {
962 reported = 1;
963 printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
964 }
965 r = emulator_write_emulated(addr, new_lo, 4, ctxt);
966 if (r != X86EMUL_CONTINUE)
967 return r;
968 return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
969}
970
971#endif
972
6aa8b732
AK		 973static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
974{
975 return kvm_arch_ops->get_segment_base(vcpu, seg);
976}
977
978int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
979{
6aa8b732
AK		 980 return X86EMUL_CONTINUE;
981}
982
983int emulate_clts(struct kvm_vcpu *vcpu)
984{
399badf3 985 unsigned long cr0;
6aa8b732 986
399badf3
AK		 987 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
988 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
6aa8b732
AK		 989 kvm_arch_ops->set_cr0(vcpu, cr0);
990 return X86EMUL_CONTINUE;
991}
992
993int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
994{
995 struct kvm_vcpu *vcpu = ctxt->vcpu;
996
997 switch (dr) {
998 case 0 ... 3:
999 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1000 return X86EMUL_CONTINUE;
1001 default:
1002 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1003 __FUNCTION__, dr);
1004 return X86EMUL_UNHANDLEABLE;
1005 }
1006}
1007
1008int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1009{
1010 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1011 int exception;
1012
1013 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1014 if (exception) {
1015 /* FIXME: better handling */
1016 return X86EMUL_UNHANDLEABLE;
1017 }
1018 return X86EMUL_CONTINUE;
1019}
1020
1021static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1022{
1023 static int reported;
1024 u8 opcodes[4];
1025 unsigned long rip = ctxt->vcpu->rip;
1026 unsigned long rip_linear;
1027
1028 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1029
1030 if (reported)
1031 return;
1032
1033 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1034
1035 printk(KERN_ERR "emulation failed but !mmio_needed?"
1036 " rip %lx %02x %02x %02x %02x\n",
1037 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1038 reported = 1;
1039}
1040
1041struct x86_emulate_ops emulate_ops = {
1042 .read_std = emulator_read_std,
1043 .write_std = emulator_write_std,
1044 .read_emulated = emulator_read_emulated,
1045 .write_emulated = emulator_write_emulated,
1046 .cmpxchg_emulated = emulator_cmpxchg_emulated,
32b35627
AK		 1047#ifdef CONFIG_X86_32
1048 .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated,
1049#endif
6aa8b732
AK		 1050};
1051
1052int emulate_instruction(struct kvm_vcpu *vcpu,
1053 struct kvm_run *run,
1054 unsigned long cr2,
1055 u16 error_code)
1056{
1057 struct x86_emulate_ctxt emulate_ctxt;
1058 int r;
1059 int cs_db, cs_l;
1060
1061 kvm_arch_ops->cache_regs(vcpu);
1062
1063 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1064
1065 emulate_ctxt.vcpu = vcpu;
1066 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1067 emulate_ctxt.cr2 = cr2;
1068 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1069 ? X86EMUL_MODE_REAL : cs_l
1070 ? X86EMUL_MODE_PROT64 : cs_db
1071 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1072
1073 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1074 emulate_ctxt.cs_base = 0;
1075 emulate_ctxt.ds_base = 0;
1076 emulate_ctxt.es_base = 0;
1077 emulate_ctxt.ss_base = 0;
1078 } else {
1079 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1080 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1081 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1082 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1083 }
1084
1085 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1086 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1087
1088 vcpu->mmio_is_write = 0;
1089 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1090
1091 if ((r || vcpu->mmio_is_write) && run) {
1092 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1093 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1094 run->mmio.len = vcpu->mmio_size;
1095 run->mmio.is_write = vcpu->mmio_is_write;
1096 }
1097
1098 if (r) {
a436036b
AK		 1099 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1100 return EMULATE_DONE;
6aa8b732
AK		 1101 if (!vcpu->mmio_needed) {
1102 report_emulation_failure(&emulate_ctxt);
1103 return EMULATE_FAIL;
1104 }
1105 return EMULATE_DO_MMIO;
1106 }
1107
1108 kvm_arch_ops->decache_regs(vcpu);
1109 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1110
1111 if (vcpu->mmio_is_write)
1112 return EMULATE_DO_MMIO;
1113
1114 return EMULATE_DONE;
1115}
1116EXPORT_SYMBOL_GPL(emulate_instruction);
1117
1118static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1119{
1120 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1121}
1122
1123void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1124{
1125 struct descriptor_table dt = { limit, base };
1126
1127 kvm_arch_ops->set_gdt(vcpu, &dt);
1128}
1129
1130void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1131{
1132 struct descriptor_table dt = { limit, base };
1133
1134 kvm_arch_ops->set_idt(vcpu, &dt);
1135}
1136
1137void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1138 unsigned long *rflags)
1139{
1140 lmsw(vcpu, msw);
1141 *rflags = kvm_arch_ops->get_rflags(vcpu);
1142}
1143
1144unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1145{
399badf3 1146 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1147 switch (cr) {
1148 case 0:
1149 return vcpu->cr0;
1150 case 2:
1151 return vcpu->cr2;
1152 case 3:
1153 return vcpu->cr3;
1154 case 4:
1155 return vcpu->cr4;
1156 default:
1157 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1158 return 0;
1159 }
1160}
1161
1162void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1163 unsigned long *rflags)
1164{
1165 switch (cr) {
1166 case 0:
1167 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1168 *rflags = kvm_arch_ops->get_rflags(vcpu);
1169 break;
1170 case 2:
1171 vcpu->cr2 = val;
1172 break;
1173 case 3:
1174 set_cr3(vcpu, val);
1175 break;
1176 case 4:
1177 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1178 break;
1179 default:
1180 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1181 }
1182}
1183
3bab1f5d
AK		 1184int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1185{
1186 u64 data;
1187
1188 switch (msr) {
1189 case 0xc0010010: /* SYSCFG */
1190 case 0xc0010015: /* HWCR */
1191 case MSR_IA32_PLATFORM_ID:
1192 case MSR_IA32_P5_MC_ADDR:
1193 case MSR_IA32_P5_MC_TYPE:
1194 case MSR_IA32_MC0_CTL:
1195 case MSR_IA32_MCG_STATUS:
1196 case MSR_IA32_MCG_CAP:
1197 case MSR_IA32_MC0_MISC:
1198 case MSR_IA32_MC0_MISC+4:
1199 case MSR_IA32_MC0_MISC+8:
1200 case MSR_IA32_MC0_MISC+12:
1201 case MSR_IA32_MC0_MISC+16:
1202 case MSR_IA32_UCODE_REV:
a8d13ea2 1203 case MSR_IA32_PERF_STATUS:
3bab1f5d
AK		 1204 /* MTRR registers */
1205 case 0xfe:
1206 case 0x200 ... 0x2ff:
1207 data = 0;
1208 break;
a8d13ea2
AK		 1209 case 0xcd: /* fsb frequency */
1210 data = 3;
1211 break;
3bab1f5d
AK		 1212 case MSR_IA32_APICBASE:
1213 data = vcpu->apic_base;
1214 break;
1215#ifdef CONFIG_X86_64
1216 case MSR_EFER:
1217 data = vcpu->shadow_efer;
1218 break;
1219#endif
1220 default:
1221 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1222 return 1;
1223 }
1224 *pdata = data;
1225 return 0;
1226}
1227EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1228
6aa8b732
AK		 1229/*
1230 * Reads an msr value (of 'msr_index') into 'pdata'.
1231 * Returns 0 on success, non-0 otherwise.
1232 * Assumes vcpu_load() was already called.
1233 */
1234static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1235{
1236 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1237}
1238
05b3e0c2 1239#ifdef CONFIG_X86_64
6aa8b732 1240
3bab1f5d 1241static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1242{
6aa8b732
AK		 1243 if (efer & EFER_RESERVED_BITS) {
1244 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1245 efer);
1246 inject_gp(vcpu);
1247 return;
1248 }
1249
1250 if (is_paging(vcpu)
1251 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1252 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1253 inject_gp(vcpu);
1254 return;
1255 }
1256
7725f0ba
AK		 1257 kvm_arch_ops->set_efer(vcpu, efer);
1258
6aa8b732
AK		 1259 efer &= ~EFER_LMA;
1260 efer |= vcpu->shadow_efer & EFER_LMA;
1261
1262 vcpu->shadow_efer = efer;
6aa8b732 1263}
6aa8b732
AK		 1264
1265#endif
1266
3bab1f5d
AK		 1267int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1268{
1269 switch (msr) {
1270#ifdef CONFIG_X86_64
1271 case MSR_EFER:
1272 set_efer(vcpu, data);
1273 break;
1274#endif
1275 case MSR_IA32_MC0_STATUS:
1276 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1277 __FUNCTION__, data);
1278 break;
1279 case MSR_IA32_UCODE_REV:
1280 case MSR_IA32_UCODE_WRITE:
1281 case 0x200 ... 0x2ff: /* MTRRs */
1282 break;
1283 case MSR_IA32_APICBASE:
1284 vcpu->apic_base = data;
1285 break;
1286 default:
1287 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1288 return 1;
1289 }
1290 return 0;
1291}
1292EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1293
6aa8b732
AK		 1294/*
1295 * Writes msr value into into the appropriate "register".
1296 * Returns 0 on success, non-0 otherwise.
1297 * Assumes vcpu_load() was already called.
1298 */
1299static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1300{
1301 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1302}
1303
1304void kvm_resched(struct kvm_vcpu *vcpu)
1305{
1306 vcpu_put(vcpu);
1307 cond_resched();
1308 /* Cannot fail - no vcpu unplug yet. */
1309 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1310}
1311EXPORT_SYMBOL_GPL(kvm_resched);
1312
1313void load_msrs(struct vmx_msr_entry *e, int n)
1314{
1315 int i;
1316
1317 for (i = 0; i < n; ++i)
1318 wrmsrl(e[i].index, e[i].data);
1319}
1320EXPORT_SYMBOL_GPL(load_msrs);
1321
1322void save_msrs(struct vmx_msr_entry *e, int n)
1323{
1324 int i;
1325
1326 for (i = 0; i < n; ++i)
1327 rdmsrl(e[i].index, e[i].data);
1328}
1329EXPORT_SYMBOL_GPL(save_msrs);
1330
1331static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1332{
1333 struct kvm_vcpu *vcpu;
1334 int r;
1335
5aacf0ca 1336 if (!valid_vcpu(kvm_run->vcpu))
6aa8b732
AK		 1337 return -EINVAL;
1338
1339 vcpu = vcpu_load(kvm, kvm_run->vcpu);
1340 if (!vcpu)
1341 return -ENOENT;
1342
1343 if (kvm_run->emulated) {
1344 kvm_arch_ops->skip_emulated_instruction(vcpu);
1345 kvm_run->emulated = 0;
1346 }
1347
1348 if (kvm_run->mmio_completed) {
1349 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1350 vcpu->mmio_read_completed = 1;
1351 }
1352
1353 vcpu->mmio_needed = 0;
1354
1355 r = kvm_arch_ops->run(vcpu, kvm_run);
1356
1357 vcpu_put(vcpu);
1358 return r;
1359}
1360
1361static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1362{
1363 struct kvm_vcpu *vcpu;
1364
5aacf0ca 1365 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1366 return -EINVAL;
1367
1368 vcpu = vcpu_load(kvm, regs->vcpu);
1369 if (!vcpu)
1370 return -ENOENT;
1371
1372 kvm_arch_ops->cache_regs(vcpu);
1373
1374 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1375 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1376 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1377 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1378 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1379 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1380 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1381 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1382#ifdef CONFIG_X86_64
6aa8b732
AK		 1383 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1384 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1385 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1386 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1387 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1388 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1389 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1390 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1391#endif
1392
1393 regs->rip = vcpu->rip;
1394 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1395
1396 /*
1397 * Don't leak debug flags in case they were set for guest debugging
1398 */
1399 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1400 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1401
1402 vcpu_put(vcpu);
1403
1404 return 0;
1405}
1406
1407static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1408{
1409 struct kvm_vcpu *vcpu;
1410
5aacf0ca 1411 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1412 return -EINVAL;
1413
1414 vcpu = vcpu_load(kvm, regs->vcpu);
1415 if (!vcpu)
1416 return -ENOENT;
1417
1418 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1419 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1420 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1421 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1422 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1423 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1424 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1425 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1426#ifdef CONFIG_X86_64
6aa8b732
AK		 1427 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1428 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1429 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1430 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1431 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1432 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1433 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1434 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1435#endif
1436
1437 vcpu->rip = regs->rip;
1438 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1439
1440 kvm_arch_ops->decache_regs(vcpu);
1441
1442 vcpu_put(vcpu);
1443
1444 return 0;
1445}
1446
1447static void get_segment(struct kvm_vcpu *vcpu,
1448 struct kvm_segment *var, int seg)
1449{
1450 return kvm_arch_ops->get_segment(vcpu, var, seg);
1451}
1452
1453static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1454{
1455 struct kvm_vcpu *vcpu;
1456 struct descriptor_table dt;
1457
5aacf0ca 1458 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1459 return -EINVAL;
1460 vcpu = vcpu_load(kvm, sregs->vcpu);
1461 if (!vcpu)
1462 return -ENOENT;
1463
1464 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1465 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1466 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1467 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1468 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1469 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1470
1471 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1472 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1473
1474 kvm_arch_ops->get_idt(vcpu, &dt);
1475 sregs->idt.limit = dt.limit;
1476 sregs->idt.base = dt.base;
1477 kvm_arch_ops->get_gdt(vcpu, &dt);
1478 sregs->gdt.limit = dt.limit;
1479 sregs->gdt.base = dt.base;
1480
399badf3 1481 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1482 sregs->cr0 = vcpu->cr0;
1483 sregs->cr2 = vcpu->cr2;
1484 sregs->cr3 = vcpu->cr3;
1485 sregs->cr4 = vcpu->cr4;
1486 sregs->cr8 = vcpu->cr8;
1487 sregs->efer = vcpu->shadow_efer;
1488 sregs->apic_base = vcpu->apic_base;
1489
1490 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1491 sizeof sregs->interrupt_bitmap);
1492
1493 vcpu_put(vcpu);
1494
1495 return 0;
1496}
1497
1498static void set_segment(struct kvm_vcpu *vcpu,
1499 struct kvm_segment *var, int seg)
1500{
1501 return kvm_arch_ops->set_segment(vcpu, var, seg);
1502}
1503
1504static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1505{
1506 struct kvm_vcpu *vcpu;
1507 int mmu_reset_needed = 0;
1508 int i;
1509 struct descriptor_table dt;
1510
5aacf0ca 1511 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1512 return -EINVAL;
1513 vcpu = vcpu_load(kvm, sregs->vcpu);
1514 if (!vcpu)
1515 return -ENOENT;
1516
1517 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1518 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1519 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1520 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1521 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1522 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1523
1524 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1525 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1526
1527 dt.limit = sregs->idt.limit;
1528 dt.base = sregs->idt.base;
1529 kvm_arch_ops->set_idt(vcpu, &dt);
1530 dt.limit = sregs->gdt.limit;
1531 dt.base = sregs->gdt.base;
1532 kvm_arch_ops->set_gdt(vcpu, &dt);
1533
1534 vcpu->cr2 = sregs->cr2;
1535 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1536 vcpu->cr3 = sregs->cr3;
1537
1538 vcpu->cr8 = sregs->cr8;
1539
1540 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 1541#ifdef CONFIG_X86_64
6aa8b732
AK		 1542 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1543#endif
1544 vcpu->apic_base = sregs->apic_base;
1545
399badf3
AK		 1546 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1547
6aa8b732
AK		 1548 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1549 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1550
1551 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1552 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 1553 if (!is_long_mode(vcpu) && is_pae(vcpu))
1554 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 1555
1556 if (mmu_reset_needed)
1557 kvm_mmu_reset_context(vcpu);
1558
1559 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1560 sizeof vcpu->irq_pending);
1561 vcpu->irq_summary = 0;
1562 for (i = 0; i < NR_IRQ_WORDS; ++i)
1563 if (vcpu->irq_pending[i])
1564 __set_bit(i, &vcpu->irq_summary);
1565
1566 vcpu_put(vcpu);
1567
1568 return 0;
1569}
1570
1571/*
1572 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1573 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 1574 *
1575 * This list is modified at module load time to reflect the
1576 * capabilities of the host cpu.
6aa8b732
AK		 1577 */
1578static u32 msrs_to_save[] = {
1579 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1580 MSR_K6_STAR,
05b3e0c2 1581#ifdef CONFIG_X86_64
6aa8b732
AK		 1582 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1583#endif
1584 MSR_IA32_TIME_STAMP_COUNTER,
1585};
1586
bf591b24
MR		 1587static unsigned num_msrs_to_save;
1588
1589static __init void kvm_init_msr_list(void)
1590{
1591 u32 dummy[2];
1592 unsigned i, j;
1593
1594 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1595 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1596 continue;
1597 if (j < i)
1598 msrs_to_save[j] = msrs_to_save[i];
1599 j++;
1600 }
1601 num_msrs_to_save = j;
1602}
6aa8b732
AK		 1603
1604/*
1605 * Adapt set_msr() to msr_io()'s calling convention
1606 */
1607static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1608{
1609 return set_msr(vcpu, index, *data);
1610}
1611
1612/*
1613 * Read or write a bunch of msrs. All parameters are kernel addresses.
1614 *
1615 * @return number of msrs set successfully.
1616 */
1617static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1618 struct kvm_msr_entry *entries,
1619 int (*do_msr)(struct kvm_vcpu *vcpu,
1620 unsigned index, u64 *data))
1621{
1622 struct kvm_vcpu *vcpu;
1623 int i;
1624
5aacf0ca 1625 if (!valid_vcpu(msrs->vcpu))
6aa8b732
AK		 1626 return -EINVAL;
1627
1628 vcpu = vcpu_load(kvm, msrs->vcpu);
1629 if (!vcpu)
1630 return -ENOENT;
1631
1632 for (i = 0; i < msrs->nmsrs; ++i)
1633 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1634 break;
1635
1636 vcpu_put(vcpu);
1637
1638 return i;
1639}
1640
1641/*
1642 * Read or write a bunch of msrs. Parameters are user addresses.
1643 *
1644 * @return number of msrs set successfully.
1645 */
1646static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1647 int (*do_msr)(struct kvm_vcpu *vcpu,
1648 unsigned index, u64 *data),
1649 int writeback)
1650{
1651 struct kvm_msrs msrs;
1652 struct kvm_msr_entry *entries;
1653 int r, n;
1654 unsigned size;
1655
1656 r = -EFAULT;
1657 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1658 goto out;
1659
1660 r = -E2BIG;
1661 if (msrs.nmsrs >= MAX_IO_MSRS)
1662 goto out;
1663
1664 r = -ENOMEM;
1665 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1666 entries = vmalloc(size);
1667 if (!entries)
1668 goto out;
1669
1670 r = -EFAULT;
1671 if (copy_from_user(entries, user_msrs->entries, size))
1672 goto out_free;
1673
1674 r = n = __msr_io(kvm, &msrs, entries, do_msr);
1675 if (r < 0)
1676 goto out_free;
1677
1678 r = -EFAULT;
1679 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1680 goto out_free;
1681
1682 r = n;
1683
1684out_free:
1685 vfree(entries);
1686out:
1687 return r;
1688}
1689
1690/*
1691 * Translate a guest virtual address to a guest physical address.
1692 */
1693static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1694{
1695 unsigned long vaddr = tr->linear_address;
1696 struct kvm_vcpu *vcpu;
1697 gpa_t gpa;
1698
1699 vcpu = vcpu_load(kvm, tr->vcpu);
1700 if (!vcpu)
1701 return -ENOENT;
1702 spin_lock(&kvm->lock);
1703 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1704 tr->physical_address = gpa;
1705 tr->valid = gpa != UNMAPPED_GVA;
1706 tr->writeable = 1;
1707 tr->usermode = 0;
1708 spin_unlock(&kvm->lock);
1709 vcpu_put(vcpu);
1710
1711 return 0;
1712}
1713
1714static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1715{
1716 struct kvm_vcpu *vcpu;
1717
5aacf0ca 1718 if (!valid_vcpu(irq->vcpu))
6aa8b732
AK		 1719 return -EINVAL;
1720 if (irq->irq < 0 || irq->irq >= 256)
1721 return -EINVAL;
1722 vcpu = vcpu_load(kvm, irq->vcpu);
1723 if (!vcpu)
1724 return -ENOENT;
1725
1726 set_bit(irq->irq, vcpu->irq_pending);
1727 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1728
1729 vcpu_put(vcpu);
1730
1731 return 0;
1732}
1733
1734static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1735 struct kvm_debug_guest *dbg)
1736{
1737 struct kvm_vcpu *vcpu;
1738 int r;
1739
5aacf0ca 1740 if (!valid_vcpu(dbg->vcpu))
6aa8b732
AK		 1741 return -EINVAL;
1742 vcpu = vcpu_load(kvm, dbg->vcpu);
1743 if (!vcpu)
1744 return -ENOENT;
1745
1746 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1747
1748 vcpu_put(vcpu);
1749
1750 return r;
1751}
1752
1753static long kvm_dev_ioctl(struct file *filp,
1754 unsigned int ioctl, unsigned long arg)
1755{
1756 struct kvm *kvm = filp->private_data;
1757 int r = -EINVAL;
1758
1759 switch (ioctl) {
0b76e20b
AK		 1760 case KVM_GET_API_VERSION:
1761 r = KVM_API_VERSION;
1762 break;
6aa8b732
AK		 1763 case KVM_CREATE_VCPU: {
1764 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1765 if (r)
1766 goto out;
1767 break;
1768 }
1769 case KVM_RUN: {
1770 struct kvm_run kvm_run;
1771
1772 r = -EFAULT;
1773 if (copy_from_user(&kvm_run, (void *)arg, sizeof kvm_run))
1774 goto out;
1775 r = kvm_dev_ioctl_run(kvm, &kvm_run);
c1150d8c 1776 if (r < 0 && r != -EINTR)
6aa8b732 1777 goto out;
c1150d8c
DL		 1778 if (copy_to_user((void *)arg, &kvm_run, sizeof kvm_run)) {
1779 r = -EFAULT;
6aa8b732 1780 goto out;
c1150d8c 1781 }
6aa8b732
AK		 1782 break;
1783 }
1784 case KVM_GET_REGS: {
1785 struct kvm_regs kvm_regs;
1786
1787 r = -EFAULT;
1788 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1789 goto out;
1790 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
1791 if (r)
1792 goto out;
1793 r = -EFAULT;
1794 if (copy_to_user((void *)arg, &kvm_regs, sizeof kvm_regs))
1795 goto out;
1796 r = 0;
1797 break;
1798 }
1799 case KVM_SET_REGS: {
1800 struct kvm_regs kvm_regs;
1801
1802 r = -EFAULT;
1803 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1804 goto out;
1805 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
1806 if (r)
1807 goto out;
1808 r = 0;
1809 break;
1810 }
1811 case KVM_GET_SREGS: {
1812 struct kvm_sregs kvm_sregs;
1813
1814 r = -EFAULT;
1815 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1816 goto out;
1817 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
1818 if (r)
1819 goto out;
1820 r = -EFAULT;
1821 if (copy_to_user((void *)arg, &kvm_sregs, sizeof kvm_sregs))
1822 goto out;
1823 r = 0;
1824 break;
1825 }
1826 case KVM_SET_SREGS: {
1827 struct kvm_sregs kvm_sregs;
1828
1829 r = -EFAULT;
1830 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1831 goto out;
1832 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
1833 if (r)
1834 goto out;
1835 r = 0;
1836 break;
1837 }
1838 case KVM_TRANSLATE: {
1839 struct kvm_translation tr;
1840
1841 r = -EFAULT;
1842 if (copy_from_user(&tr, (void *)arg, sizeof tr))
1843 goto out;
1844 r = kvm_dev_ioctl_translate(kvm, &tr);
1845 if (r)
1846 goto out;
1847 r = -EFAULT;
1848 if (copy_to_user((void *)arg, &tr, sizeof tr))
1849 goto out;
1850 r = 0;
1851 break;
1852 }
1853 case KVM_INTERRUPT: {
1854 struct kvm_interrupt irq;
1855
1856 r = -EFAULT;
1857 if (copy_from_user(&irq, (void *)arg, sizeof irq))
1858 goto out;
1859 r = kvm_dev_ioctl_interrupt(kvm, &irq);
1860 if (r)
1861 goto out;
1862 r = 0;
1863 break;
1864 }
1865 case KVM_DEBUG_GUEST: {
1866 struct kvm_debug_guest dbg;
1867
1868 r = -EFAULT;
1869 if (copy_from_user(&dbg, (void *)arg, sizeof dbg))
1870 goto out;
1871 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
1872 if (r)
1873 goto out;
1874 r = 0;
1875 break;
1876 }
1877 case KVM_SET_MEMORY_REGION: {
1878 struct kvm_memory_region kvm_mem;
1879
1880 r = -EFAULT;
1881 if (copy_from_user(&kvm_mem, (void *)arg, sizeof kvm_mem))
1882 goto out;
1883 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
1884 if (r)
1885 goto out;
1886 break;
1887 }
1888 case KVM_GET_DIRTY_LOG: {
1889 struct kvm_dirty_log log;
1890
1891 r = -EFAULT;
1892 if (copy_from_user(&log, (void *)arg, sizeof log))
1893 goto out;
1894 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
1895 if (r)
1896 goto out;
1897 break;
1898 }
1899 case KVM_GET_MSRS:
1900 r = msr_io(kvm, (void __user *)arg, get_msr, 1);
1901 break;
1902 case KVM_SET_MSRS:
1903 r = msr_io(kvm, (void __user *)arg, do_set_msr, 0);
1904 break;
1905 case KVM_GET_MSR_INDEX_LIST: {
1906 struct kvm_msr_list __user *user_msr_list = (void __user *)arg;
1907 struct kvm_msr_list msr_list;
1908 unsigned n;
1909
1910 r = -EFAULT;
1911 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1912 goto out;
1913 n = msr_list.nmsrs;
bf591b24 1914 msr_list.nmsrs = num_msrs_to_save;
6aa8b732
AK		 1915 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1916 goto out;
1917 r = -E2BIG;
bf591b24 1918 if (n < num_msrs_to_save)
6aa8b732
AK		 1919 goto out;
1920 r = -EFAULT;
1921 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 1922 num_msrs_to_save * sizeof(u32)))
6aa8b732
AK		 1923 goto out;
1924 r = 0;
1925 }
1926 default:
1927 ;
1928 }
1929out:
1930 return r;
1931}
1932
1933static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
1934 unsigned long address,
1935 int *type)
1936{
1937 struct kvm *kvm = vma->vm_file->private_data;
1938 unsigned long pgoff;
1939 struct kvm_memory_slot *slot;
1940 struct page *page;
1941
1942 *type = VM_FAULT_MINOR;
1943 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1944 slot = gfn_to_memslot(kvm, pgoff);
1945 if (!slot)
1946 return NOPAGE_SIGBUS;
1947 page = gfn_to_page(slot, pgoff);
1948 if (!page)
1949 return NOPAGE_SIGBUS;
1950 get_page(page);
1951 return page;
1952}
1953
1954static struct vm_operations_struct kvm_dev_vm_ops = {
1955 .nopage = kvm_dev_nopage,
1956};
1957
1958static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
1959{
1960 vma->vm_ops = &kvm_dev_vm_ops;
1961 return 0;
1962}
1963
1964static struct file_operations kvm_chardev_ops = {
1965 .open = kvm_dev_open,
1966 .release = kvm_dev_release,
1967 .unlocked_ioctl = kvm_dev_ioctl,
1968 .compat_ioctl = kvm_dev_ioctl,
1969 .mmap = kvm_dev_mmap,
1970};
1971
1972static struct miscdevice kvm_dev = {
1973 MISC_DYNAMIC_MINOR,
1974 "kvm",
1975 &kvm_chardev_ops,
1976};
1977
1978static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1979 void *v)
1980{
1981 if (val == SYS_RESTART) {
1982 /*
1983 * Some (well, at least mine) BIOSes hang on reboot if
1984 * in vmx root mode.
1985 */
1986 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1987 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1988 }
1989 return NOTIFY_OK;
1990}
1991
1992static struct notifier_block kvm_reboot_notifier = {
1993 .notifier_call = kvm_reboot,
1994 .priority = 0,
1995};
1996
1997static __init void kvm_init_debug(void)
1998{
1999 struct kvm_stats_debugfs_item *p;
2000
2001 debugfs_dir = debugfs_create_dir("kvm", 0);
2002 for (p = debugfs_entries; p->name; ++p)
2003 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
2004 p->data);
2005}
2006
2007static void kvm_exit_debug(void)
2008{
2009 struct kvm_stats_debugfs_item *p;
2010
2011 for (p = debugfs_entries; p->name; ++p)
2012 debugfs_remove(p->dentry);
2013 debugfs_remove(debugfs_dir);
2014}
2015
2016hpa_t bad_page_address;
2017
2018int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
2019{
2020 int r;
2021
09db28b8
YI		 2022 if (kvm_arch_ops) {
2023 printk(KERN_ERR "kvm: already loaded the other module\n");
2024 return -EEXIST;
2025 }
2026
e097f35c 2027 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 2028 printk(KERN_ERR "kvm: no hardware support\n");
2029 return -EOPNOTSUPP;
2030 }
e097f35c 2031 if (ops->disabled_by_bios()) {
6aa8b732
AK		 2032 printk(KERN_ERR "kvm: disabled by bios\n");
2033 return -EOPNOTSUPP;
2034 }
2035
e097f35c
YI		 2036 kvm_arch_ops = ops;
2037
6aa8b732
AK		 2038 r = kvm_arch_ops->hardware_setup();
2039 if (r < 0)
2040 return r;
2041
2042 on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1);
2043 register_reboot_notifier(&kvm_reboot_notifier);
2044
2045 kvm_chardev_ops.owner = module;
2046
2047 r = misc_register(&kvm_dev);
2048 if (r) {
2049 printk (KERN_ERR "kvm: misc device register failed\n");
2050 goto out_free;
2051 }
2052
2053 return r;
2054
2055out_free:
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();
2059 return r;
2060}
2061
2062void kvm_exit_arch(void)
2063{
2064 misc_deregister(&kvm_dev);
2065
2066 unregister_reboot_notifier(&kvm_reboot_notifier);
2067 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
2068 kvm_arch_ops->hardware_unsetup();
09db28b8 2069 kvm_arch_ops = NULL;
6aa8b732
AK		 2070}
2071
2072static __init int kvm_init(void)
2073{
2074 static struct page *bad_page;
2075 int r = 0;
2076
2077 kvm_init_debug();
2078
bf591b24
MR		 2079 kvm_init_msr_list();
2080
6aa8b732
AK		 2081 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2082 r = -ENOMEM;
2083 goto out;
2084 }
2085
2086 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2087 memset(__va(bad_page_address), 0, PAGE_SIZE);
2088
2089 return r;
2090
2091out:
2092 kvm_exit_debug();
2093 return r;
2094}
2095
2096static __exit void kvm_exit(void)
2097{
2098 kvm_exit_debug();
2099 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
2100}
2101
2102module_init(kvm_init)
2103module_exit(kvm_exit)
2104
2105EXPORT_SYMBOL_GPL(kvm_init_arch);
2106EXPORT_SYMBOL_GPL(kvm_exit_arch);
kernel source for telekom puls (alcatel/mediatek)