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KVM: Use alignment properties of vcpu to simplify FPU ops
[mirror_ubuntu-artful-kernel.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"
e495606d
AK		 19#include "x86_emulate.h"
20#include "segment_descriptor.h"
6aa8b732
AK		 21
22#include <linux/kvm.h>
23#include <linux/module.h>
24#include <linux/errno.h>
6aa8b732
AK		 25#include <linux/percpu.h>
26#include <linux/gfp.h>
6aa8b732
AK		 27#include <linux/mm.h>
28#include <linux/miscdevice.h>
29#include <linux/vmalloc.h>
6aa8b732 30#include <linux/reboot.h>
6aa8b732
AK		 31#include <linux/debugfs.h>
32#include <linux/highmem.h>
33#include <linux/file.h>
59ae6c6b 34#include <linux/sysdev.h>
774c47f1 35#include <linux/cpu.h>
e8edc6e0 36#include <linux/sched.h>
d9e368d6
AK		 37#include <linux/cpumask.h>
38#include <linux/smp.h>
d6d28168 39#include <linux/anon_inodes.h>
6aa8b732 40
e495606d
AK		 41#include <asm/processor.h>
42#include <asm/msr.h>
43#include <asm/io.h>
44#include <asm/uaccess.h>
45#include <asm/desc.h>
6aa8b732
AK		 46
47MODULE_AUTHOR("Qumranet");
48MODULE_LICENSE("GPL");
49
133de902
AK		 50static DEFINE_SPINLOCK(kvm_lock);
51static LIST_HEAD(vm_list);
52
1b6c0168
AK		 53static cpumask_t cpus_hardware_enabled;
54
6aa8b732 55struct kvm_arch_ops *kvm_arch_ops;
c16f862d
RR		 56struct kmem_cache *kvm_vcpu_cache;
57EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
1165f5fe 58
15ad7146
AK		 59static __read_mostly struct preempt_ops kvm_preempt_ops;
60
1165f5fe 61#define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
6aa8b732
AK		 62
63static struct kvm_stats_debugfs_item {
64 const char *name;
1165f5fe 65 int offset;
6aa8b732
AK		 66 struct dentry *dentry;
67} debugfs_entries[] = {
1165f5fe
AK		 68 { "pf_fixed", STAT_OFFSET(pf_fixed) },
69 { "pf_guest", STAT_OFFSET(pf_guest) },
70 { "tlb_flush", STAT_OFFSET(tlb_flush) },
71 { "invlpg", STAT_OFFSET(invlpg) },
72 { "exits", STAT_OFFSET(exits) },
73 { "io_exits", STAT_OFFSET(io_exits) },
74 { "mmio_exits", STAT_OFFSET(mmio_exits) },
75 { "signal_exits", STAT_OFFSET(signal_exits) },
76 { "irq_window", STAT_OFFSET(irq_window_exits) },
77 { "halt_exits", STAT_OFFSET(halt_exits) },
78 { "request_irq", STAT_OFFSET(request_irq_exits) },
79 { "irq_exits", STAT_OFFSET(irq_exits) },
e6adf283 80 { "light_exits", STAT_OFFSET(light_exits) },
2cc51560 81 { "efer_reload", STAT_OFFSET(efer_reload) },
1165f5fe 82 { NULL }
6aa8b732
AK		 83};
84
85static struct dentry *debugfs_dir;
86
87#define MAX_IO_MSRS 256
88
707d92fa
RR		 89#define CR0_RESERVED_BITS \
90 (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
91 | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
92 | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
66aee91a
RR		 93#define CR4_RESERVED_BITS \
94 (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
95 | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
96 | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \
97 | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
98
7075bc81 99#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
6aa8b732
AK		 100#define EFER_RESERVED_BITS 0xfffffffffffff2fe
101
05b3e0c2 102#ifdef CONFIG_X86_64
6aa8b732
AK		 103// LDT or TSS descriptor in the GDT. 16 bytes.
104struct segment_descriptor_64 {
105 struct segment_descriptor s;
106 u32 base_higher;
107 u32 pad_zero;
108};
109
110#endif
111
bccf2150
AK		 112static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
113 unsigned long arg);
114
6aa8b732
AK		 115unsigned long segment_base(u16 selector)
116{
117 struct descriptor_table gdt;
118 struct segment_descriptor *d;
119 unsigned long table_base;
120 typedef unsigned long ul;
121 unsigned long v;
122
123 if (selector == 0)
124 return 0;
125
126 asm ("sgdt %0" : "=m"(gdt));
127 table_base = gdt.base;
128
129 if (selector & 4) { /* from ldt */
130 u16 ldt_selector;
131
132 asm ("sldt %0" : "=g"(ldt_selector));
133 table_base = segment_base(ldt_selector);
134 }
135 d = (struct segment_descriptor *)(table_base + (selector & ~7));
136 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
05b3e0c2 137#ifdef CONFIG_X86_64
6aa8b732
AK		 138 if (d->system == 0
139 && (d->type == 2 || d->type == 9 || d->type == 11))
140 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
141#endif
142 return v;
143}
144EXPORT_SYMBOL_GPL(segment_base);
145
5aacf0ca
JM		 146static inline int valid_vcpu(int n)
147{
148 return likely(n >= 0 && n < KVM_MAX_VCPUS);
149}
150
7702fd1f
AK		 151void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
152{
153 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
154 return;
155
156 vcpu->guest_fpu_loaded = 1;
b114b080
RR		 157 fx_save(&vcpu->host_fx_image);
158 fx_restore(&vcpu->guest_fx_image);
7702fd1f
AK		 159}
160EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
161
162void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
163{
164 if (!vcpu->guest_fpu_loaded)
165 return;
166
167 vcpu->guest_fpu_loaded = 0;
b114b080
RR		 168 fx_save(&vcpu->guest_fx_image);
169 fx_restore(&vcpu->host_fx_image);
7702fd1f
AK		 170}
171EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
172
bccf2150
AK		 173/*
174 * Switches to specified vcpu, until a matching vcpu_put()
175 */
176static void vcpu_load(struct kvm_vcpu *vcpu)
6aa8b732 177{
15ad7146
AK		 178 int cpu;
179
bccf2150 180 mutex_lock(&vcpu->mutex);
15ad7146
AK		 181 cpu = get_cpu();
182 preempt_notifier_register(&vcpu->preempt_notifier);
183 kvm_arch_ops->vcpu_load(vcpu, cpu);
184 put_cpu();
6aa8b732
AK		 185}
186
6aa8b732
AK		 187static void vcpu_put(struct kvm_vcpu *vcpu)
188{
15ad7146 189 preempt_disable();
6aa8b732 190 kvm_arch_ops->vcpu_put(vcpu);
15ad7146
AK		 191 preempt_notifier_unregister(&vcpu->preempt_notifier);
192 preempt_enable();
6aa8b732
AK		 193 mutex_unlock(&vcpu->mutex);
194}
195
d9e368d6
AK		 196static void ack_flush(void *_completed)
197{
198 atomic_t *completed = _completed;
199
200 atomic_inc(completed);
201}
202
203void kvm_flush_remote_tlbs(struct kvm *kvm)
204{
205 int i, cpu, needed;
206 cpumask_t cpus;
207 struct kvm_vcpu *vcpu;
208 atomic_t completed;
209
210 atomic_set(&completed, 0);
211 cpus_clear(cpus);
212 needed = 0;
fb3f0f51
RR		 213 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
214 vcpu = kvm->vcpus[i];
215 if (!vcpu)
216 continue;
d9e368d6
AK		 217 if (test_and_set_bit(KVM_TLB_FLUSH, &vcpu->requests))
218 continue;
219 cpu = vcpu->cpu;
220 if (cpu != -1 && cpu != raw_smp_processor_id())
221 if (!cpu_isset(cpu, cpus)) {
222 cpu_set(cpu, cpus);
223 ++needed;
224 }
225 }
226
227 /*
228 * We really want smp_call_function_mask() here. But that's not
229 * available, so ipi all cpus in parallel and wait for them
230 * to complete.
231 */
232 for (cpu = first_cpu(cpus); cpu != NR_CPUS; cpu = next_cpu(cpu, cpus))
233 smp_call_function_single(cpu, ack_flush, &completed, 1, 0);
234 while (atomic_read(&completed) != needed) {
235 cpu_relax();
236 barrier();
237 }
238}
239
fb3f0f51
RR		 240int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
241{
242 struct page *page;
243 int r;
244
245 mutex_init(&vcpu->mutex);
246 vcpu->cpu = -1;
247 vcpu->mmu.root_hpa = INVALID_PAGE;
248 vcpu->kvm = kvm;
249 vcpu->vcpu_id = id;
250
251 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
252 if (!page) {
253 r = -ENOMEM;
254 goto fail;
255 }
256 vcpu->run = page_address(page);
257
258 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
259 if (!page) {
260 r = -ENOMEM;
261 goto fail_free_run;
262 }
263 vcpu->pio_data = page_address(page);
264
fb3f0f51
RR		 265 r = kvm_mmu_create(vcpu);
266 if (r < 0)
267 goto fail_free_pio_data;
268
269 return 0;
270
271fail_free_pio_data:
272 free_page((unsigned long)vcpu->pio_data);
273fail_free_run:
274 free_page((unsigned long)vcpu->run);
275fail:
276 return -ENOMEM;
277}
278EXPORT_SYMBOL_GPL(kvm_vcpu_init);
279
280void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
281{
282 kvm_mmu_destroy(vcpu);
283 free_page((unsigned long)vcpu->pio_data);
284 free_page((unsigned long)vcpu->run);
285}
286EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
287
f17abe9a 288static struct kvm *kvm_create_vm(void)
6aa8b732
AK		 289{
290 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
6aa8b732
AK		 291
292 if (!kvm)
f17abe9a 293 return ERR_PTR(-ENOMEM);
6aa8b732 294
74906345 295 kvm_io_bus_init(&kvm->pio_bus);
11ec2804 296 mutex_init(&kvm->lock);
6aa8b732 297 INIT_LIST_HEAD(&kvm->active_mmu_pages);
2eeb2e94 298 kvm_io_bus_init(&kvm->mmio_bus);
5e58cfe4
RR		 299 spin_lock(&kvm_lock);
300 list_add(&kvm->vm_list, &vm_list);
301 spin_unlock(&kvm_lock);
f17abe9a
AK		 302 return kvm;
303}
304
305static int kvm_dev_open(struct inode *inode, struct file *filp)
306{
6aa8b732
AK		 307 return 0;
308}
309
310/*
311 * Free any memory in @free but not in @dont.
312 */
313static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
314 struct kvm_memory_slot *dont)
315{
316 int i;
317
318 if (!dont || free->phys_mem != dont->phys_mem)
319 if (free->phys_mem) {
320 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 321 if (free->phys_mem[i])
322 __free_page(free->phys_mem[i]);
6aa8b732
AK		 323 vfree(free->phys_mem);
324 }
325
326 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
327 vfree(free->dirty_bitmap);
328
8b6d44c7 329 free->phys_mem = NULL;
6aa8b732 330 free->npages = 0;
8b6d44c7 331 free->dirty_bitmap = NULL;
6aa8b732
AK		 332}
333
334static void kvm_free_physmem(struct kvm *kvm)
335{
336 int i;
337
338 for (i = 0; i < kvm->nmemslots; ++i)
8b6d44c7 339 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
6aa8b732
AK		 340}
341
039576c0
AK		 342static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
343{
344 int i;
345
3077c451 346 for (i = 0; i < ARRAY_SIZE(vcpu->pio.guest_pages); ++i)
039576c0
AK		 347 if (vcpu->pio.guest_pages[i]) {
348 __free_page(vcpu->pio.guest_pages[i]);
349 vcpu->pio.guest_pages[i] = NULL;
350 }
351}
352
7b53aa56
AK		 353static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
354{
7b53aa56
AK		 355 vcpu_load(vcpu);
356 kvm_mmu_unload(vcpu);
357 vcpu_put(vcpu);
358}
359
6aa8b732
AK		 360static void kvm_free_vcpus(struct kvm *kvm)
361{
362 unsigned int i;
363
7b53aa56
AK		 364 /*
365 * Unpin any mmu pages first.
366 */
367 for (i = 0; i < KVM_MAX_VCPUS; ++i)
fb3f0f51
RR		 368 if (kvm->vcpus[i])
369 kvm_unload_vcpu_mmu(kvm->vcpus[i]);
370 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
371 if (kvm->vcpus[i]) {
372 kvm_arch_ops->vcpu_free(kvm->vcpus[i]);
373 kvm->vcpus[i] = NULL;
374 }
375 }
376
6aa8b732
AK		 377}
378
379static int kvm_dev_release(struct inode *inode, struct file *filp)
380{
f17abe9a
AK		 381 return 0;
382}
6aa8b732 383
f17abe9a
AK		 384static void kvm_destroy_vm(struct kvm *kvm)
385{
133de902
AK		 386 spin_lock(&kvm_lock);
387 list_del(&kvm->vm_list);
388 spin_unlock(&kvm_lock);
74906345 389 kvm_io_bus_destroy(&kvm->pio_bus);
2eeb2e94 390 kvm_io_bus_destroy(&kvm->mmio_bus);
6aa8b732
AK		 391 kvm_free_vcpus(kvm);
392 kvm_free_physmem(kvm);
393 kfree(kvm);
f17abe9a
AK		 394}
395
396static int kvm_vm_release(struct inode *inode, struct file *filp)
397{
398 struct kvm *kvm = filp->private_data;
399
400 kvm_destroy_vm(kvm);
6aa8b732
AK		 401 return 0;
402}
403
404static void inject_gp(struct kvm_vcpu *vcpu)
405{
406 kvm_arch_ops->inject_gp(vcpu, 0);
407}
408
1342d353
AK		 409/*
410 * Load the pae pdptrs. Return true is they are all valid.
411 */
412static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
6aa8b732
AK		 413{
414 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
1342d353 415 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
6aa8b732 416 int i;
6aa8b732 417 u64 *pdpt;
1342d353 418 int ret;
954bbbc2 419 struct page *page;
c820c2aa 420 u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)];
6aa8b732 421
11ec2804 422 mutex_lock(&vcpu->kvm->lock);
954bbbc2 423 page = gfn_to_page(vcpu->kvm, pdpt_gfn);
c820c2aa
RR		 424 if (!page) {
425 ret = 0;
426 goto out;
427 }
428
954bbbc2 429 pdpt = kmap_atomic(page, KM_USER0);
c820c2aa
RR		 430 memcpy(pdpte, pdpt+offset, sizeof(pdpte));
431 kunmap_atomic(pdpt, KM_USER0);
6aa8b732 432
c820c2aa
RR		 433 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
434 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
1342d353
AK		 435 ret = 0;
436 goto out;
437 }
6aa8b732 438 }
c820c2aa 439 ret = 1;
6aa8b732 440
c820c2aa 441 memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs));
1342d353 442out:
11ec2804 443 mutex_unlock(&vcpu->kvm->lock);
6aa8b732 444
1342d353 445 return ret;
6aa8b732
AK		 446}
447
448void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
449{
707d92fa 450 if (cr0 & CR0_RESERVED_BITS) {
6aa8b732
AK		 451 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
452 cr0, vcpu->cr0);
453 inject_gp(vcpu);
454 return;
455 }
456
707d92fa 457 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
6aa8b732
AK		 458 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
459 inject_gp(vcpu);
460 return;
461 }
462
707d92fa 463 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
6aa8b732
AK		 464 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
465 "and a clear PE flag\n");
466 inject_gp(vcpu);
467 return;
468 }
469
707d92fa 470 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
05b3e0c2 471#ifdef CONFIG_X86_64
6aa8b732
AK		 472 if ((vcpu->shadow_efer & EFER_LME)) {
473 int cs_db, cs_l;
474
475 if (!is_pae(vcpu)) {
476 printk(KERN_DEBUG "set_cr0: #GP, start paging "
477 "in long mode while PAE is disabled\n");
478 inject_gp(vcpu);
479 return;
480 }
481 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
482 if (cs_l) {
483 printk(KERN_DEBUG "set_cr0: #GP, start paging "
484 "in long mode while CS.L == 1\n");
485 inject_gp(vcpu);
486 return;
487
488 }
489 } else
490#endif
1342d353 491 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 492 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
493 "reserved bits\n");
494 inject_gp(vcpu);
495 return;
496 }
497
498 }
499
500 kvm_arch_ops->set_cr0(vcpu, cr0);
501 vcpu->cr0 = cr0;
502
11ec2804 503 mutex_lock(&vcpu->kvm->lock);
6aa8b732 504 kvm_mmu_reset_context(vcpu);
11ec2804 505 mutex_unlock(&vcpu->kvm->lock);
6aa8b732
AK		 506 return;
507}
508EXPORT_SYMBOL_GPL(set_cr0);
509
510void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
511{
512 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
513}
514EXPORT_SYMBOL_GPL(lmsw);
515
516void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
517{
66aee91a 518 if (cr4 & CR4_RESERVED_BITS) {
6aa8b732
AK		 519 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
520 inject_gp(vcpu);
521 return;
522 }
523
a9058ecd 524 if (is_long_mode(vcpu)) {
66aee91a 525 if (!(cr4 & X86_CR4_PAE)) {
6aa8b732
AK		 526 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
527 "in long mode\n");
528 inject_gp(vcpu);
529 return;
530 }
66aee91a 531 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
1342d353 532 && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 533 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
534 inject_gp(vcpu);
310bc76c 535 return;
6aa8b732
AK		 536 }
537
66aee91a 538 if (cr4 & X86_CR4_VMXE) {
6aa8b732
AK		 539 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
540 inject_gp(vcpu);
541 return;
542 }
543 kvm_arch_ops->set_cr4(vcpu, cr4);
11ec2804 544 mutex_lock(&vcpu->kvm->lock);
6aa8b732 545 kvm_mmu_reset_context(vcpu);
11ec2804 546 mutex_unlock(&vcpu->kvm->lock);
6aa8b732
AK		 547}
548EXPORT_SYMBOL_GPL(set_cr4);
549
550void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
551{
a9058ecd 552 if (is_long_mode(vcpu)) {
f802a307 553 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
6aa8b732
AK		 554 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
555 inject_gp(vcpu);
556 return;
557 }
558 } else {
f802a307
RR		 559 if (is_pae(vcpu)) {
560 if (cr3 & CR3_PAE_RESERVED_BITS) {
561 printk(KERN_DEBUG
562 "set_cr3: #GP, reserved bits\n");
563 inject_gp(vcpu);
564 return;
565 }
566 if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
567 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
568 "reserved bits\n");
569 inject_gp(vcpu);
570 return;
571 }
572 } else {
573 if (cr3 & CR3_NONPAE_RESERVED_BITS) {
574 printk(KERN_DEBUG
575 "set_cr3: #GP, reserved bits\n");
576 inject_gp(vcpu);
577 return;
578 }
6aa8b732
AK		 579 }
580 }
581
582 vcpu->cr3 = cr3;
11ec2804 583 mutex_lock(&vcpu->kvm->lock);
d21225ee
IM		 584 /*
585 * Does the new cr3 value map to physical memory? (Note, we
586 * catch an invalid cr3 even in real-mode, because it would
587 * cause trouble later on when we turn on paging anyway.)
588 *
589 * A real CPU would silently accept an invalid cr3 and would
590 * attempt to use it - with largely undefined (and often hard
591 * to debug) behavior on the guest side.
592 */
593 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
594 inject_gp(vcpu);
595 else
596 vcpu->mmu.new_cr3(vcpu);
11ec2804 597 mutex_unlock(&vcpu->kvm->lock);
6aa8b732
AK		 598}
599EXPORT_SYMBOL_GPL(set_cr3);
600
601void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
602{
7075bc81 603 if (cr8 & CR8_RESERVED_BITS) {
6aa8b732
AK		 604 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
605 inject_gp(vcpu);
606 return;
607 }
608 vcpu->cr8 = cr8;
609}
610EXPORT_SYMBOL_GPL(set_cr8);
611
612void fx_init(struct kvm_vcpu *vcpu)
613{
b114b080 614 unsigned after_mxcsr_mask;
6aa8b732 615
9bd01506
RR		 616 /* Initialize guest FPU by resetting ours and saving into guest's */
617 preempt_disable();
b114b080 618 fx_save(&vcpu->host_fx_image);
6aa8b732 619 fpu_init();
b114b080
RR		 620 fx_save(&vcpu->guest_fx_image);
621 fx_restore(&vcpu->host_fx_image);
9bd01506 622 preempt_enable();
6aa8b732 623
b114b080
RR		 624 after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
625 vcpu->guest_fx_image.mxcsr = 0x1f80;
626 memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask,
627 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
6aa8b732
AK		 628}
629EXPORT_SYMBOL_GPL(fx_init);
630
6aa8b732
AK		 631/*
632 * Allocate some memory and give it an address in the guest physical address
633 * space.
634 *
635 * Discontiguous memory is allowed, mostly for framebuffers.
636 */
2c6f5df9
AK		 637static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
638 struct kvm_memory_region *mem)
6aa8b732
AK		 639{
640 int r;
641 gfn_t base_gfn;
642 unsigned long npages;
643 unsigned long i;
644 struct kvm_memory_slot *memslot;
645 struct kvm_memory_slot old, new;
646 int memory_config_version;
647
648 r = -EINVAL;
649 /* General sanity checks */
650 if (mem->memory_size & (PAGE_SIZE - 1))
651 goto out;
652 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
653 goto out;
654 if (mem->slot >= KVM_MEMORY_SLOTS)
655 goto out;
656 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
657 goto out;
658
659 memslot = &kvm->memslots[mem->slot];
660 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
661 npages = mem->memory_size >> PAGE_SHIFT;
662
663 if (!npages)
664 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
665
666raced:
11ec2804 667 mutex_lock(&kvm->lock);
6aa8b732
AK		 668
669 memory_config_version = kvm->memory_config_version;
670 new = old = *memslot;
671
672 new.base_gfn = base_gfn;
673 new.npages = npages;
674 new.flags = mem->flags;
675
676 /* Disallow changing a memory slot's size. */
677 r = -EINVAL;
678 if (npages && old.npages && npages != old.npages)
679 goto out_unlock;
680
681 /* Check for overlaps */
682 r = -EEXIST;
683 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
684 struct kvm_memory_slot *s = &kvm->memslots[i];
685
686 if (s == memslot)
687 continue;
688 if (!((base_gfn + npages <= s->base_gfn) ||
689 (base_gfn >= s->base_gfn + s->npages)))
690 goto out_unlock;
691 }
692 /*
693 * Do memory allocations outside lock. memory_config_version will
694 * detect any races.
695 */
11ec2804 696 mutex_unlock(&kvm->lock);
6aa8b732
AK		 697
698 /* Deallocate if slot is being removed */
699 if (!npages)
8b6d44c7 700 new.phys_mem = NULL;
6aa8b732
AK		 701
702 /* Free page dirty bitmap if unneeded */
703 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
8b6d44c7 704 new.dirty_bitmap = NULL;
6aa8b732
AK		 705
706 r = -ENOMEM;
707
708 /* Allocate if a slot is being created */
709 if (npages && !new.phys_mem) {
710 new.phys_mem = vmalloc(npages * sizeof(struct page *));
711
712 if (!new.phys_mem)
713 goto out_free;
714
715 memset(new.phys_mem, 0, npages * sizeof(struct page *));
716 for (i = 0; i < npages; ++i) {
717 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
718 | __GFP_ZERO);
719 if (!new.phys_mem[i])
720 goto out_free;
5972e953 721 set_page_private(new.phys_mem[i],0);
6aa8b732
AK		 722 }
723 }
724
725 /* Allocate page dirty bitmap if needed */
726 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
727 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
728
729 new.dirty_bitmap = vmalloc(dirty_bytes);
730 if (!new.dirty_bitmap)
731 goto out_free;
732 memset(new.dirty_bitmap, 0, dirty_bytes);
733 }
734
11ec2804 735 mutex_lock(&kvm->lock);
6aa8b732
AK		 736
737 if (memory_config_version != kvm->memory_config_version) {
11ec2804 738 mutex_unlock(&kvm->lock);
6aa8b732
AK		 739 kvm_free_physmem_slot(&new, &old);
740 goto raced;
741 }
742
743 r = -EAGAIN;
744 if (kvm->busy)
745 goto out_unlock;
746
747 if (mem->slot >= kvm->nmemslots)
748 kvm->nmemslots = mem->slot + 1;
749
750 *memslot = new;
751 ++kvm->memory_config_version;
752
90cb0529
AK		 753 kvm_mmu_slot_remove_write_access(kvm, mem->slot);
754 kvm_flush_remote_tlbs(kvm);
6aa8b732 755
11ec2804 756 mutex_unlock(&kvm->lock);
6aa8b732
AK		 757
758 kvm_free_physmem_slot(&old, &new);
759 return 0;
760
761out_unlock:
11ec2804 762 mutex_unlock(&kvm->lock);
6aa8b732
AK		 763out_free:
764 kvm_free_physmem_slot(&new, &old);
765out:
766 return r;
767}
768
769/*
770 * Get (and clear) the dirty memory log for a memory slot.
771 */
2c6f5df9
AK		 772static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
773 struct kvm_dirty_log *log)
6aa8b732
AK		 774{
775 struct kvm_memory_slot *memslot;
776 int r, i;
777 int n;
778 unsigned long any = 0;
779
11ec2804 780 mutex_lock(&kvm->lock);
6aa8b732
AK		 781
782 /*
783 * Prevent changes to guest memory configuration even while the lock
784 * is not taken.
785 */
786 ++kvm->busy;
11ec2804 787 mutex_unlock(&kvm->lock);
6aa8b732
AK		 788 r = -EINVAL;
789 if (log->slot >= KVM_MEMORY_SLOTS)
790 goto out;
791
792 memslot = &kvm->memslots[log->slot];
793 r = -ENOENT;
794 if (!memslot->dirty_bitmap)
795 goto out;
796
cd1a4a98 797 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
6aa8b732 798
cd1a4a98 799 for (i = 0; !any && i < n/sizeof(long); ++i)
6aa8b732
AK		 800 any = memslot->dirty_bitmap[i];
801
802 r = -EFAULT;
803 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
804 goto out;
805
11ec2804 806 mutex_lock(&kvm->lock);
90cb0529
AK		 807 kvm_mmu_slot_remove_write_access(kvm, log->slot);
808 kvm_flush_remote_tlbs(kvm);
809 memset(memslot->dirty_bitmap, 0, n);
11ec2804 810 mutex_unlock(&kvm->lock);
6aa8b732
AK		 811
812 r = 0;
813
814out:
11ec2804 815 mutex_lock(&kvm->lock);
6aa8b732 816 --kvm->busy;
11ec2804 817 mutex_unlock(&kvm->lock);
6aa8b732
AK		 818 return r;
819}
820
e8207547
AK		 821/*
822 * Set a new alias region. Aliases map a portion of physical memory into
823 * another portion. This is useful for memory windows, for example the PC
824 * VGA region.
825 */
826static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
827 struct kvm_memory_alias *alias)
828{
829 int r, n;
830 struct kvm_mem_alias *p;
831
832 r = -EINVAL;
833 /* General sanity checks */
834 if (alias->memory_size & (PAGE_SIZE - 1))
835 goto out;
836 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
837 goto out;
838 if (alias->slot >= KVM_ALIAS_SLOTS)
839 goto out;
840 if (alias->guest_phys_addr + alias->memory_size
841 < alias->guest_phys_addr)
842 goto out;
843 if (alias->target_phys_addr + alias->memory_size
844 < alias->target_phys_addr)
845 goto out;
846
11ec2804 847 mutex_lock(&kvm->lock);
e8207547
AK		 848
849 p = &kvm->aliases[alias->slot];
850 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
851 p->npages = alias->memory_size >> PAGE_SHIFT;
852 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
853
854 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
855 if (kvm->aliases[n - 1].npages)
856 break;
857 kvm->naliases = n;
858
90cb0529 859 kvm_mmu_zap_all(kvm);
e8207547 860
11ec2804 861 mutex_unlock(&kvm->lock);
e8207547
AK		 862
863 return 0;
864
865out:
866 return r;
867}
868
869static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
870{
871 int i;
872 struct kvm_mem_alias *alias;
873
874 for (i = 0; i < kvm->naliases; ++i) {
875 alias = &kvm->aliases[i];
876 if (gfn >= alias->base_gfn
877 && gfn < alias->base_gfn + alias->npages)
878 return alias->target_gfn + gfn - alias->base_gfn;
879 }
880 return gfn;
881}
882
883static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
6aa8b732
AK		 884{
885 int i;
886
887 for (i = 0; i < kvm->nmemslots; ++i) {
888 struct kvm_memory_slot *memslot = &kvm->memslots[i];
889
890 if (gfn >= memslot->base_gfn
891 && gfn < memslot->base_gfn + memslot->npages)
892 return memslot;
893 }
8b6d44c7 894 return NULL;
6aa8b732 895}
e8207547
AK		 896
897struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
898{
899 gfn = unalias_gfn(kvm, gfn);
900 return __gfn_to_memslot(kvm, gfn);
901}
6aa8b732 902
954bbbc2
AK		 903struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
904{
905 struct kvm_memory_slot *slot;
906
e8207547
AK		 907 gfn = unalias_gfn(kvm, gfn);
908 slot = __gfn_to_memslot(kvm, gfn);
954bbbc2
AK		 909 if (!slot)
910 return NULL;
911 return slot->phys_mem[gfn - slot->base_gfn];
912}
913EXPORT_SYMBOL_GPL(gfn_to_page);
914
6aa8b732
AK		 915void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
916{
917 int i;
31389947 918 struct kvm_memory_slot *memslot;
6aa8b732
AK		 919 unsigned long rel_gfn;
920
921 for (i = 0; i < kvm->nmemslots; ++i) {
922 memslot = &kvm->memslots[i];
923
924 if (gfn >= memslot->base_gfn
925 && gfn < memslot->base_gfn + memslot->npages) {
926
31389947 927 if (!memslot->dirty_bitmap)
6aa8b732
AK		 928 return;
929
930 rel_gfn = gfn - memslot->base_gfn;
931
932 /* avoid RMW */
933 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
934 set_bit(rel_gfn, memslot->dirty_bitmap);
935 return;
936 }
937 }
938}
939
e7d5d76c 940int emulator_read_std(unsigned long addr,
4c690a1e 941 void *val,
6aa8b732 942 unsigned int bytes,
cebff02b 943 struct kvm_vcpu *vcpu)
6aa8b732 944{
6aa8b732
AK		 945 void *data = val;
946
947 while (bytes) {
948 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
949 unsigned offset = addr & (PAGE_SIZE-1);
950 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
951 unsigned long pfn;
954bbbc2
AK		 952 struct page *page;
953 void *page_virt;
6aa8b732
AK		 954
955 if (gpa == UNMAPPED_GVA)
956 return X86EMUL_PROPAGATE_FAULT;
957 pfn = gpa >> PAGE_SHIFT;
954bbbc2
AK		 958 page = gfn_to_page(vcpu->kvm, pfn);
959 if (!page)
6aa8b732 960 return X86EMUL_UNHANDLEABLE;
954bbbc2 961 page_virt = kmap_atomic(page, KM_USER0);
6aa8b732 962
954bbbc2 963 memcpy(data, page_virt + offset, tocopy);
6aa8b732 964
954bbbc2 965 kunmap_atomic(page_virt, KM_USER0);
6aa8b732
AK		 966
967 bytes -= tocopy;
968 data += tocopy;
969 addr += tocopy;
970 }
971
972 return X86EMUL_CONTINUE;
973}
e7d5d76c 974EXPORT_SYMBOL_GPL(emulator_read_std);
6aa8b732
AK		 975
976static int emulator_write_std(unsigned long addr,
4c690a1e 977 const void *val,
6aa8b732 978 unsigned int bytes,
cebff02b 979 struct kvm_vcpu *vcpu)
6aa8b732
AK		 980{
981 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
982 addr, bytes);
983 return X86EMUL_UNHANDLEABLE;
984}
985
2eeb2e94
GH		 986static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
987 gpa_t addr)
988{
989 /*
990 * Note that its important to have this wrapper function because
991 * in the very near future we will be checking for MMIOs against
992 * the LAPIC as well as the general MMIO bus
993 */
994 return kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
995}
996
74906345
ED		 997static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
998 gpa_t addr)
999{
1000 return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
1001}
1002
6aa8b732 1003static int emulator_read_emulated(unsigned long addr,
4c690a1e 1004 void *val,
6aa8b732 1005 unsigned int bytes,
cebff02b 1006 struct kvm_vcpu *vcpu)
6aa8b732 1007{
2eeb2e94
GH		 1008 struct kvm_io_device *mmio_dev;
1009 gpa_t gpa;
6aa8b732
AK		 1010
1011 if (vcpu->mmio_read_completed) {
1012 memcpy(val, vcpu->mmio_data, bytes);
1013 vcpu->mmio_read_completed = 0;
1014 return X86EMUL_CONTINUE;
cebff02b 1015 } else if (emulator_read_std(addr, val, bytes, vcpu)
6aa8b732
AK		 1016 == X86EMUL_CONTINUE)
1017 return X86EMUL_CONTINUE;
d27d4aca 1018
2eeb2e94
GH		 1019 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1020 if (gpa == UNMAPPED_GVA)
1021 return X86EMUL_PROPAGATE_FAULT;
6aa8b732 1022
2eeb2e94
GH		 1023 /*
1024 * Is this MMIO handled locally?
1025 */
1026 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1027 if (mmio_dev) {
1028 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1029 return X86EMUL_CONTINUE;
6aa8b732 1030 }
2eeb2e94
GH		 1031
1032 vcpu->mmio_needed = 1;
1033 vcpu->mmio_phys_addr = gpa;
1034 vcpu->mmio_size = bytes;
1035 vcpu->mmio_is_write = 0;
1036
1037 return X86EMUL_UNHANDLEABLE;
6aa8b732
AK		 1038}
1039
da4a00f0 1040static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
4c690a1e 1041 const void *val, int bytes)
da4a00f0 1042{
da4a00f0
AK		 1043 struct page *page;
1044 void *virt;
1045
1046 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
1047 return 0;
954bbbc2
AK		 1048 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1049 if (!page)
da4a00f0 1050 return 0;
ab51a434 1051 mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
da4a00f0 1052 virt = kmap_atomic(page, KM_USER0);
fe551881 1053 kvm_mmu_pte_write(vcpu, gpa, val, bytes);
7cfa4b0a 1054 memcpy(virt + offset_in_page(gpa), val, bytes);
da4a00f0 1055 kunmap_atomic(virt, KM_USER0);
da4a00f0
AK		 1056 return 1;
1057}
1058
b0fcd903
AK		 1059static int emulator_write_emulated_onepage(unsigned long addr,
1060 const void *val,
1061 unsigned int bytes,
cebff02b 1062 struct kvm_vcpu *vcpu)
6aa8b732 1063{
2eeb2e94
GH		 1064 struct kvm_io_device *mmio_dev;
1065 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
6aa8b732 1066
c9047f53
AK		 1067 if (gpa == UNMAPPED_GVA) {
1068 kvm_arch_ops->inject_page_fault(vcpu, addr, 2);
6aa8b732 1069 return X86EMUL_PROPAGATE_FAULT;
c9047f53 1070 }
6aa8b732 1071
da4a00f0
AK		 1072 if (emulator_write_phys(vcpu, gpa, val, bytes))
1073 return X86EMUL_CONTINUE;
1074
2eeb2e94
GH		 1075 /*
1076 * Is this MMIO handled locally?
1077 */
1078 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1079 if (mmio_dev) {
1080 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1081 return X86EMUL_CONTINUE;
1082 }
1083
6aa8b732
AK		 1084 vcpu->mmio_needed = 1;
1085 vcpu->mmio_phys_addr = gpa;
1086 vcpu->mmio_size = bytes;
1087 vcpu->mmio_is_write = 1;
4c690a1e 1088 memcpy(vcpu->mmio_data, val, bytes);
6aa8b732
AK		 1089
1090 return X86EMUL_CONTINUE;
1091}
1092
e7d5d76c 1093int emulator_write_emulated(unsigned long addr,
b0fcd903
AK		 1094 const void *val,
1095 unsigned int bytes,
cebff02b 1096 struct kvm_vcpu *vcpu)
b0fcd903
AK		 1097{
1098 /* Crossing a page boundary? */
1099 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1100 int rc, now;
1101
1102 now = -addr & ~PAGE_MASK;
cebff02b 1103 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
b0fcd903
AK		 1104 if (rc != X86EMUL_CONTINUE)
1105 return rc;
1106 addr += now;
1107 val += now;
1108 bytes -= now;
1109 }
cebff02b 1110 return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
b0fcd903 1111}
e7d5d76c 1112EXPORT_SYMBOL_GPL(emulator_write_emulated);
b0fcd903 1113
6aa8b732 1114static int emulator_cmpxchg_emulated(unsigned long addr,
4c690a1e
AK		 1115 const void *old,
1116 const void *new,
6aa8b732 1117 unsigned int bytes,
cebff02b 1118 struct kvm_vcpu *vcpu)
6aa8b732
AK		 1119{
1120 static int reported;
1121
1122 if (!reported) {
1123 reported = 1;
1124 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1125 }
cebff02b 1126 return emulator_write_emulated(addr, new, bytes, vcpu);
6aa8b732
AK		 1127}
1128
1129static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1130{
1131 return kvm_arch_ops->get_segment_base(vcpu, seg);
1132}
1133
1134int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1135{
6aa8b732
AK		 1136 return X86EMUL_CONTINUE;
1137}
1138
1139int emulate_clts(struct kvm_vcpu *vcpu)
1140{
399badf3 1141 unsigned long cr0;
6aa8b732 1142
707d92fa 1143 cr0 = vcpu->cr0 & ~X86_CR0_TS;
6aa8b732
AK		 1144 kvm_arch_ops->set_cr0(vcpu, cr0);
1145 return X86EMUL_CONTINUE;
1146}
1147
1148int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1149{
1150 struct kvm_vcpu *vcpu = ctxt->vcpu;
1151
1152 switch (dr) {
1153 case 0 ... 3:
1154 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1155 return X86EMUL_CONTINUE;
1156 default:
1157 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1158 __FUNCTION__, dr);
1159 return X86EMUL_UNHANDLEABLE;
1160 }
1161}
1162
1163int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1164{
1165 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1166 int exception;
1167
1168 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1169 if (exception) {
1170 /* FIXME: better handling */
1171 return X86EMUL_UNHANDLEABLE;
1172 }
1173 return X86EMUL_CONTINUE;
1174}
1175
1176static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1177{
1178 static int reported;
1179 u8 opcodes[4];
1180 unsigned long rip = ctxt->vcpu->rip;
1181 unsigned long rip_linear;
1182
1183 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1184
1185 if (reported)
1186 return;
1187
cebff02b 1188 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt->vcpu);
6aa8b732
AK		 1189
1190 printk(KERN_ERR "emulation failed but !mmio_needed?"
1191 " rip %lx %02x %02x %02x %02x\n",
1192 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1193 reported = 1;
1194}
1195
1196struct x86_emulate_ops emulate_ops = {
1197 .read_std = emulator_read_std,
1198 .write_std = emulator_write_std,
1199 .read_emulated = emulator_read_emulated,
1200 .write_emulated = emulator_write_emulated,
1201 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1202};
1203
1204int emulate_instruction(struct kvm_vcpu *vcpu,
1205 struct kvm_run *run,
1206 unsigned long cr2,
1207 u16 error_code)
1208{
1209 struct x86_emulate_ctxt emulate_ctxt;
1210 int r;
1211 int cs_db, cs_l;
1212
e7df56e4 1213 vcpu->mmio_fault_cr2 = cr2;
6aa8b732
AK		 1214 kvm_arch_ops->cache_regs(vcpu);
1215
1216 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1217
1218 emulate_ctxt.vcpu = vcpu;
1219 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1220 emulate_ctxt.cr2 = cr2;
1221 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1222 ? X86EMUL_MODE_REAL : cs_l
1223 ? X86EMUL_MODE_PROT64 : cs_db
1224 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1225
1226 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1227 emulate_ctxt.cs_base = 0;
1228 emulate_ctxt.ds_base = 0;
1229 emulate_ctxt.es_base = 0;
1230 emulate_ctxt.ss_base = 0;
1231 } else {
1232 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1233 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1234 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1235 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1236 }
1237
1238 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1239 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1240
1241 vcpu->mmio_is_write = 0;
1242 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1243
1244 if ((r || vcpu->mmio_is_write) && run) {
8fc0d085 1245 run->exit_reason = KVM_EXIT_MMIO;
6aa8b732
AK		 1246 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1247 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1248 run->mmio.len = vcpu->mmio_size;
1249 run->mmio.is_write = vcpu->mmio_is_write;
1250 }
1251
1252 if (r) {
a436036b
AK		 1253 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1254 return EMULATE_DONE;
6aa8b732
AK		 1255 if (!vcpu->mmio_needed) {
1256 report_emulation_failure(&emulate_ctxt);
1257 return EMULATE_FAIL;
1258 }
1259 return EMULATE_DO_MMIO;
1260 }
1261
1262 kvm_arch_ops->decache_regs(vcpu);
1263 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1264
02c83209
AK		 1265 if (vcpu->mmio_is_write) {
1266 vcpu->mmio_needed = 0;
6aa8b732 1267 return EMULATE_DO_MMIO;
02c83209 1268 }
6aa8b732
AK		 1269
1270 return EMULATE_DONE;
1271}
1272EXPORT_SYMBOL_GPL(emulate_instruction);
1273
d3bef15f
AK		 1274int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1275{
1276 if (vcpu->irq_summary)
1277 return 1;
1278
1279 vcpu->run->exit_reason = KVM_EXIT_HLT;
1280 ++vcpu->stat.halt_exits;
1281 return 0;
1282}
1283EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1284
270fd9b9
AK		 1285int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1286{
1287 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1288
9b22bf57 1289 kvm_arch_ops->cache_regs(vcpu);
270fd9b9
AK		 1290 ret = -KVM_EINVAL;
1291#ifdef CONFIG_X86_64
1292 if (is_long_mode(vcpu)) {
1293 nr = vcpu->regs[VCPU_REGS_RAX];
1294 a0 = vcpu->regs[VCPU_REGS_RDI];
1295 a1 = vcpu->regs[VCPU_REGS_RSI];
1296 a2 = vcpu->regs[VCPU_REGS_RDX];
1297 a3 = vcpu->regs[VCPU_REGS_RCX];
1298 a4 = vcpu->regs[VCPU_REGS_R8];
1299 a5 = vcpu->regs[VCPU_REGS_R9];
1300 } else
1301#endif
1302 {
1303 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1304 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1305 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1306 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1307 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1308 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1309 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1310 }
1311 switch (nr) {
1312 default:
519ef353 1313 run->hypercall.nr = nr;
b4e63f56
AK		 1314 run->hypercall.args[0] = a0;
1315 run->hypercall.args[1] = a1;
1316 run->hypercall.args[2] = a2;
1317 run->hypercall.args[3] = a3;
1318 run->hypercall.args[4] = a4;
1319 run->hypercall.args[5] = a5;
1320 run->hypercall.ret = ret;
1321 run->hypercall.longmode = is_long_mode(vcpu);
1322 kvm_arch_ops->decache_regs(vcpu);
1323 return 0;
270fd9b9
AK		 1324 }
1325 vcpu->regs[VCPU_REGS_RAX] = ret;
9b22bf57 1326 kvm_arch_ops->decache_regs(vcpu);
270fd9b9
AK		 1327 return 1;
1328}
1329EXPORT_SYMBOL_GPL(kvm_hypercall);
1330
6aa8b732
AK		 1331static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1332{
1333 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1334}
1335
1336void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1337{
1338 struct descriptor_table dt = { limit, base };
1339
1340 kvm_arch_ops->set_gdt(vcpu, &dt);
1341}
1342
1343void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1344{
1345 struct descriptor_table dt = { limit, base };
1346
1347 kvm_arch_ops->set_idt(vcpu, &dt);
1348}
1349
1350void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1351 unsigned long *rflags)
1352{
1353 lmsw(vcpu, msw);
1354 *rflags = kvm_arch_ops->get_rflags(vcpu);
1355}
1356
1357unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1358{
25c4c276 1359 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 1360 switch (cr) {
1361 case 0:
1362 return vcpu->cr0;
1363 case 2:
1364 return vcpu->cr2;
1365 case 3:
1366 return vcpu->cr3;
1367 case 4:
1368 return vcpu->cr4;
1369 default:
1370 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1371 return 0;
1372 }
1373}
1374
1375void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1376 unsigned long *rflags)
1377{
1378 switch (cr) {
1379 case 0:
1380 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1381 *rflags = kvm_arch_ops->get_rflags(vcpu);
1382 break;
1383 case 2:
1384 vcpu->cr2 = val;
1385 break;
1386 case 3:
1387 set_cr3(vcpu, val);
1388 break;
1389 case 4:
1390 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1391 break;
1392 default:
1393 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1394 }
1395}
1396
102d8325
IM		 1397/*
1398 * Register the para guest with the host:
1399 */
1400static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1401{
1402 struct kvm_vcpu_para_state *para_state;
1403 hpa_t para_state_hpa, hypercall_hpa;
1404 struct page *para_state_page;
1405 unsigned char *hypercall;
1406 gpa_t hypercall_gpa;
1407
1408 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1409 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1410
1411 /*
1412 * Needs to be page aligned:
1413 */
1414 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1415 goto err_gp;
1416
1417 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1418 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1419 if (is_error_hpa(para_state_hpa))
1420 goto err_gp;
1421
ab51a434 1422 mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
102d8325 1423 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
fe551881 1424 para_state = kmap(para_state_page);
102d8325
IM		 1425
1426 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1427 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1428
1429 para_state->host_version = KVM_PARA_API_VERSION;
1430 /*
1431 * We cannot support guests that try to register themselves
1432 * with a newer API version than the host supports:
1433 */
1434 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1435 para_state->ret = -KVM_EINVAL;
1436 goto err_kunmap_skip;
1437 }
1438
1439 hypercall_gpa = para_state->hypercall_gpa;
1440 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1441 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1442 if (is_error_hpa(hypercall_hpa)) {
1443 para_state->ret = -KVM_EINVAL;
1444 goto err_kunmap_skip;
1445 }
1446
1447 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1448 vcpu->para_state_page = para_state_page;
1449 vcpu->para_state_gpa = para_state_gpa;
1450 vcpu->hypercall_gpa = hypercall_gpa;
1451
ab51a434 1452 mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
102d8325
IM		 1453 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1454 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1455 kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1456 kunmap_atomic(hypercall, KM_USER1);
1457
1458 para_state->ret = 0;
1459err_kunmap_skip:
fe551881 1460 kunmap(para_state_page);
102d8325
IM		 1461 return 0;
1462err_gp:
1463 return 1;
1464}
1465
3bab1f5d
AK		 1466int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1467{
1468 u64 data;
1469
1470 switch (msr) {
1471 case 0xc0010010: /* SYSCFG */
1472 case 0xc0010015: /* HWCR */
1473 case MSR_IA32_PLATFORM_ID:
1474 case MSR_IA32_P5_MC_ADDR:
1475 case MSR_IA32_P5_MC_TYPE:
1476 case MSR_IA32_MC0_CTL:
1477 case MSR_IA32_MCG_STATUS:
1478 case MSR_IA32_MCG_CAP:
1479 case MSR_IA32_MC0_MISC:
1480 case MSR_IA32_MC0_MISC+4:
1481 case MSR_IA32_MC0_MISC+8:
1482 case MSR_IA32_MC0_MISC+12:
1483 case MSR_IA32_MC0_MISC+16:
1484 case MSR_IA32_UCODE_REV:
a8d13ea2 1485 case MSR_IA32_PERF_STATUS:
2dc7094b 1486 case MSR_IA32_EBL_CR_POWERON:
3bab1f5d
AK		 1487 /* MTRR registers */
1488 case 0xfe:
1489 case 0x200 ... 0x2ff:
1490 data = 0;
1491 break;
a8d13ea2
AK		 1492 case 0xcd: /* fsb frequency */
1493 data = 3;
1494 break;
3bab1f5d
AK		 1495 case MSR_IA32_APICBASE:
1496 data = vcpu->apic_base;
1497 break;
6f00e68f
AK		 1498 case MSR_IA32_MISC_ENABLE:
1499 data = vcpu->ia32_misc_enable_msr;
1500 break;
3bab1f5d
AK		 1501#ifdef CONFIG_X86_64
1502 case MSR_EFER:
1503 data = vcpu->shadow_efer;
1504 break;
1505#endif
1506 default:
1507 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1508 return 1;
1509 }
1510 *pdata = data;
1511 return 0;
1512}
1513EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1514
6aa8b732
AK		 1515/*
1516 * Reads an msr value (of 'msr_index') into 'pdata'.
1517 * Returns 0 on success, non-0 otherwise.
1518 * Assumes vcpu_load() was already called.
1519 */
35f3f286 1520int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
6aa8b732
AK		 1521{
1522 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1523}
1524
05b3e0c2 1525#ifdef CONFIG_X86_64
6aa8b732 1526
3bab1f5d 1527static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1528{
6aa8b732
AK		 1529 if (efer & EFER_RESERVED_BITS) {
1530 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1531 efer);
1532 inject_gp(vcpu);
1533 return;
1534 }
1535
1536 if (is_paging(vcpu)
1537 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1538 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1539 inject_gp(vcpu);
1540 return;
1541 }
1542
7725f0ba
AK		 1543 kvm_arch_ops->set_efer(vcpu, efer);
1544
6aa8b732
AK		 1545 efer &= ~EFER_LMA;
1546 efer |= vcpu->shadow_efer & EFER_LMA;
1547
1548 vcpu->shadow_efer = efer;
6aa8b732 1549}
6aa8b732
AK		 1550
1551#endif
1552
3bab1f5d
AK		 1553int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1554{
1555 switch (msr) {
1556#ifdef CONFIG_X86_64
1557 case MSR_EFER:
1558 set_efer(vcpu, data);
1559 break;
1560#endif
1561 case MSR_IA32_MC0_STATUS:
1562 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1563 __FUNCTION__, data);
1564 break;
0e5bf0d0
SK		 1565 case MSR_IA32_MCG_STATUS:
1566 printk(KERN_WARNING "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
1567 __FUNCTION__, data);
1568 break;
3bab1f5d
AK		 1569 case MSR_IA32_UCODE_REV:
1570 case MSR_IA32_UCODE_WRITE:
1571 case 0x200 ... 0x2ff: /* MTRRs */
1572 break;
1573 case MSR_IA32_APICBASE:
1574 vcpu->apic_base = data;
1575 break;
6f00e68f
AK		 1576 case MSR_IA32_MISC_ENABLE:
1577 vcpu->ia32_misc_enable_msr = data;
1578 break;
102d8325
IM		 1579 /*
1580 * This is the 'probe whether the host is KVM' logic:
1581 */
1582 case MSR_KVM_API_MAGIC:
1583 return vcpu_register_para(vcpu, data);
1584
3bab1f5d
AK		 1585 default:
1586 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1587 return 1;
1588 }
1589 return 0;
1590}
1591EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1592
6aa8b732
AK		 1593/*
1594 * Writes msr value into into the appropriate "register".
1595 * Returns 0 on success, non-0 otherwise.
1596 * Assumes vcpu_load() was already called.
1597 */
35f3f286 1598int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
6aa8b732
AK		 1599{
1600 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1601}
1602
1603void kvm_resched(struct kvm_vcpu *vcpu)
1604{
3fca0365
YD		 1605 if (!need_resched())
1606 return;
6aa8b732 1607 cond_resched();
6aa8b732
AK		 1608}
1609EXPORT_SYMBOL_GPL(kvm_resched);
1610
06465c5a
AK		 1611void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1612{
1613 int i;
1614 u32 function;
1615 struct kvm_cpuid_entry *e, *best;
1616
1617 kvm_arch_ops->cache_regs(vcpu);
1618 function = vcpu->regs[VCPU_REGS_RAX];
1619 vcpu->regs[VCPU_REGS_RAX] = 0;
1620 vcpu->regs[VCPU_REGS_RBX] = 0;
1621 vcpu->regs[VCPU_REGS_RCX] = 0;
1622 vcpu->regs[VCPU_REGS_RDX] = 0;
1623 best = NULL;
1624 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1625 e = &vcpu->cpuid_entries[i];
1626 if (e->function == function) {
1627 best = e;
1628 break;
1629 }
1630 /*
1631 * Both basic or both extended?
1632 */
1633 if (((e->function ^ function) & 0x80000000) == 0)
1634 if (!best || e->function > best->function)
1635 best = e;
1636 }
1637 if (best) {
1638 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1639 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1640 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1641 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1642 }
1643 kvm_arch_ops->decache_regs(vcpu);
1644 kvm_arch_ops->skip_emulated_instruction(vcpu);
1645}
1646EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1647
039576c0 1648static int pio_copy_data(struct kvm_vcpu *vcpu)
46fc1477 1649{
039576c0
AK		 1650 void *p = vcpu->pio_data;
1651 void *q;
1652 unsigned bytes;
1653 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1654
039576c0
AK		 1655 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1656 PAGE_KERNEL);
1657 if (!q) {
039576c0
AK		 1658 free_pio_guest_pages(vcpu);
1659 return -ENOMEM;
1660 }
1661 q += vcpu->pio.guest_page_offset;
1662 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1663 if (vcpu->pio.in)
1664 memcpy(q, p, bytes);
1665 else
1666 memcpy(p, q, bytes);
1667 q -= vcpu->pio.guest_page_offset;
1668 vunmap(q);
039576c0
AK		 1669 free_pio_guest_pages(vcpu);
1670 return 0;
1671}
1672
1673static int complete_pio(struct kvm_vcpu *vcpu)
1674{
1675 struct kvm_pio_request *io = &vcpu->pio;
46fc1477 1676 long delta;
039576c0 1677 int r;
46fc1477
AK		 1678
1679 kvm_arch_ops->cache_regs(vcpu);
1680
1681 if (!io->string) {
039576c0
AK		 1682 if (io->in)
1683 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
46fc1477
AK		 1684 io->size);
1685 } else {
039576c0
AK		 1686 if (io->in) {
1687 r = pio_copy_data(vcpu);
1688 if (r) {
1689 kvm_arch_ops->cache_regs(vcpu);
1690 return r;
1691 }
1692 }
1693
46fc1477
AK		 1694 delta = 1;
1695 if (io->rep) {
039576c0 1696 delta *= io->cur_count;
46fc1477
AK		 1697 /*
1698 * The size of the register should really depend on
1699 * current address size.
1700 */
1701 vcpu->regs[VCPU_REGS_RCX] -= delta;
1702 }
039576c0 1703 if (io->down)
46fc1477
AK		 1704 delta = -delta;
1705 delta *= io->size;
039576c0 1706 if (io->in)
46fc1477
AK		 1707 vcpu->regs[VCPU_REGS_RDI] += delta;
1708 else
1709 vcpu->regs[VCPU_REGS_RSI] += delta;
1710 }
1711
46fc1477
AK		 1712 kvm_arch_ops->decache_regs(vcpu);
1713
039576c0
AK		 1714 io->count -= io->cur_count;
1715 io->cur_count = 0;
1716
1717 if (!io->count)
1718 kvm_arch_ops->skip_emulated_instruction(vcpu);
1719 return 0;
46fc1477
AK		 1720}
1721
65619eb5
ED		 1722static void kernel_pio(struct kvm_io_device *pio_dev,
1723 struct kvm_vcpu *vcpu,
1724 void *pd)
74906345
ED		 1725{
1726 /* TODO: String I/O for in kernel device */
1727
1728 if (vcpu->pio.in)
1729 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1730 vcpu->pio.size,
65619eb5 1731 pd);
74906345
ED		 1732 else
1733 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1734 vcpu->pio.size,
65619eb5
ED		 1735 pd);
1736}
1737
1738static void pio_string_write(struct kvm_io_device *pio_dev,
1739 struct kvm_vcpu *vcpu)
1740{
1741 struct kvm_pio_request *io = &vcpu->pio;
1742 void *pd = vcpu->pio_data;
1743 int i;
1744
1745 for (i = 0; i < io->cur_count; i++) {
1746 kvm_iodevice_write(pio_dev, io->port,
1747 io->size,
1748 pd);
1749 pd += io->size;
1750 }
74906345
ED		 1751}
1752
039576c0
AK		 1753int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1754 int size, unsigned long count, int string, int down,
1755 gva_t address, int rep, unsigned port)
1756{
1757 unsigned now, in_page;
65619eb5 1758 int i, ret = 0;
039576c0
AK		 1759 int nr_pages = 1;
1760 struct page *page;
74906345 1761 struct kvm_io_device *pio_dev;
039576c0
AK		 1762
1763 vcpu->run->exit_reason = KVM_EXIT_IO;
1764 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1765 vcpu->run->io.size = size;
1766 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1767 vcpu->run->io.count = count;
1768 vcpu->run->io.port = port;
1769 vcpu->pio.count = count;
1770 vcpu->pio.cur_count = count;
1771 vcpu->pio.size = size;
1772 vcpu->pio.in = in;
74906345 1773 vcpu->pio.port = port;
039576c0
AK		 1774 vcpu->pio.string = string;
1775 vcpu->pio.down = down;
1776 vcpu->pio.guest_page_offset = offset_in_page(address);
1777 vcpu->pio.rep = rep;
1778
74906345 1779 pio_dev = vcpu_find_pio_dev(vcpu, port);
039576c0
AK		 1780 if (!string) {
1781 kvm_arch_ops->cache_regs(vcpu);
1782 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1783 kvm_arch_ops->decache_regs(vcpu);
74906345 1784 if (pio_dev) {
65619eb5 1785 kernel_pio(pio_dev, vcpu, vcpu->pio_data);
74906345
ED		 1786 complete_pio(vcpu);
1787 return 1;
1788 }
039576c0
AK		 1789 return 0;
1790 }
1791
1792 if (!count) {
1793 kvm_arch_ops->skip_emulated_instruction(vcpu);
1794 return 1;
1795 }
1796
1797 now = min(count, PAGE_SIZE / size);
1798
1799 if (!down)
1800 in_page = PAGE_SIZE - offset_in_page(address);
1801 else
1802 in_page = offset_in_page(address) + size;
1803 now = min(count, (unsigned long)in_page / size);
1804 if (!now) {
1805 /*
1806 * String I/O straddles page boundary. Pin two guest pages
1807 * so that we satisfy atomicity constraints. Do just one
1808 * transaction to avoid complexity.
1809 */
1810 nr_pages = 2;
1811 now = 1;
1812 }
1813 if (down) {
1814 /*
1815 * String I/O in reverse. Yuck. Kill the guest, fix later.
1816 */
1817 printk(KERN_ERR "kvm: guest string pio down\n");
1818 inject_gp(vcpu);
1819 return 1;
1820 }
1821 vcpu->run->io.count = now;
1822 vcpu->pio.cur_count = now;
1823
1824 for (i = 0; i < nr_pages; ++i) {
11ec2804 1825 mutex_lock(&vcpu->kvm->lock);
039576c0
AK		 1826 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1827 if (page)
1828 get_page(page);
1829 vcpu->pio.guest_pages[i] = page;
11ec2804 1830 mutex_unlock(&vcpu->kvm->lock);
039576c0
AK		 1831 if (!page) {
1832 inject_gp(vcpu);
1833 free_pio_guest_pages(vcpu);
1834 return 1;
1835 }
1836 }
1837
65619eb5
ED		 1838 if (!vcpu->pio.in) {
1839 /* string PIO write */
1840 ret = pio_copy_data(vcpu);
1841 if (ret >= 0 && pio_dev) {
1842 pio_string_write(pio_dev, vcpu);
1843 complete_pio(vcpu);
1844 if (vcpu->pio.count == 0)
1845 ret = 1;
1846 }
1847 } else if (pio_dev)
1848 printk(KERN_ERR "no string pio read support yet, "
1849 "port %x size %d count %ld\n",
1850 port, size, count);
1851
1852 return ret;
039576c0
AK		 1853}
1854EXPORT_SYMBOL_GPL(kvm_setup_pio);
1855
bccf2150 1856static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
6aa8b732 1857{
6aa8b732 1858 int r;
1961d276 1859 sigset_t sigsaved;
6aa8b732 1860
bccf2150 1861 vcpu_load(vcpu);
6aa8b732 1862
1961d276
AK		 1863 if (vcpu->sigset_active)
1864 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
1865
54810342
DL		 1866 /* re-sync apic's tpr */
1867 vcpu->cr8 = kvm_run->cr8;
1868
02c83209
AK		 1869 if (vcpu->pio.cur_count) {
1870 r = complete_pio(vcpu);
1871 if (r)
1872 goto out;
1873 }
1874
1875 if (vcpu->mmio_needed) {
1876 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1877 vcpu->mmio_read_completed = 1;
1878 vcpu->mmio_needed = 0;
1879 r = emulate_instruction(vcpu, kvm_run,
1880 vcpu->mmio_fault_cr2, 0);
1881 if (r == EMULATE_DO_MMIO) {
1882 /*
1883 * Read-modify-write. Back to userspace.
1884 */
02c83209
AK		 1885 r = 0;
1886 goto out;
46fc1477 1887 }
6aa8b732
AK		 1888 }
1889
8eb7d334 1890 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
b4e63f56
AK		 1891 kvm_arch_ops->cache_regs(vcpu);
1892 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
1893 kvm_arch_ops->decache_regs(vcpu);
1894 }
1895
6aa8b732
AK		 1896 r = kvm_arch_ops->run(vcpu, kvm_run);
1897
039576c0 1898out:
1961d276
AK		 1899 if (vcpu->sigset_active)
1900 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1901
6aa8b732
AK		 1902 vcpu_put(vcpu);
1903 return r;
1904}
1905
bccf2150
AK		 1906static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
1907 struct kvm_regs *regs)
6aa8b732 1908{
bccf2150 1909 vcpu_load(vcpu);
6aa8b732
AK		 1910
1911 kvm_arch_ops->cache_regs(vcpu);
1912
1913 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1914 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1915 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1916 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1917 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1918 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1919 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1920 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1921#ifdef CONFIG_X86_64
6aa8b732
AK		 1922 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1923 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1924 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1925 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1926 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1927 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1928 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1929 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1930#endif
1931
1932 regs->rip = vcpu->rip;
1933 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1934
1935 /*
1936 * Don't leak debug flags in case they were set for guest debugging
1937 */
1938 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1939 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1940
1941 vcpu_put(vcpu);
1942
1943 return 0;
1944}
1945
bccf2150
AK		 1946static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
1947 struct kvm_regs *regs)
6aa8b732 1948{
bccf2150 1949 vcpu_load(vcpu);
6aa8b732
AK		 1950
1951 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1952 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1953 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1954 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1955 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1956 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1957 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1958 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1959#ifdef CONFIG_X86_64
6aa8b732
AK		 1960 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1961 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1962 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1963 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1964 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1965 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1966 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1967 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1968#endif
1969
1970 vcpu->rip = regs->rip;
1971 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1972
1973 kvm_arch_ops->decache_regs(vcpu);
1974
1975 vcpu_put(vcpu);
1976
1977 return 0;
1978}
1979
1980static void get_segment(struct kvm_vcpu *vcpu,
1981 struct kvm_segment *var, int seg)
1982{
1983 return kvm_arch_ops->get_segment(vcpu, var, seg);
1984}
1985
bccf2150
AK		 1986static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1987 struct kvm_sregs *sregs)
6aa8b732 1988{
6aa8b732
AK		 1989 struct descriptor_table dt;
1990
bccf2150 1991 vcpu_load(vcpu);
6aa8b732
AK		 1992
1993 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1994 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1995 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1996 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1997 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1998 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1999
2000 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2001 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2002
2003 kvm_arch_ops->get_idt(vcpu, &dt);
2004 sregs->idt.limit = dt.limit;
2005 sregs->idt.base = dt.base;
2006 kvm_arch_ops->get_gdt(vcpu, &dt);
2007 sregs->gdt.limit = dt.limit;
2008 sregs->gdt.base = dt.base;
2009
25c4c276 2010 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 2011 sregs->cr0 = vcpu->cr0;
2012 sregs->cr2 = vcpu->cr2;
2013 sregs->cr3 = vcpu->cr3;
2014 sregs->cr4 = vcpu->cr4;
2015 sregs->cr8 = vcpu->cr8;
2016 sregs->efer = vcpu->shadow_efer;
2017 sregs->apic_base = vcpu->apic_base;
2018
2019 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2020 sizeof sregs->interrupt_bitmap);
2021
2022 vcpu_put(vcpu);
2023
2024 return 0;
2025}
2026
2027static void set_segment(struct kvm_vcpu *vcpu,
2028 struct kvm_segment *var, int seg)
2029{
2030 return kvm_arch_ops->set_segment(vcpu, var, seg);
2031}
2032
bccf2150
AK		 2033static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2034 struct kvm_sregs *sregs)
6aa8b732 2035{
6aa8b732
AK		 2036 int mmu_reset_needed = 0;
2037 int i;
2038 struct descriptor_table dt;
2039
bccf2150 2040 vcpu_load(vcpu);
6aa8b732 2041
6aa8b732
AK		 2042 dt.limit = sregs->idt.limit;
2043 dt.base = sregs->idt.base;
2044 kvm_arch_ops->set_idt(vcpu, &dt);
2045 dt.limit = sregs->gdt.limit;
2046 dt.base = sregs->gdt.base;
2047 kvm_arch_ops->set_gdt(vcpu, &dt);
2048
2049 vcpu->cr2 = sregs->cr2;
2050 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2051 vcpu->cr3 = sregs->cr3;
2052
2053 vcpu->cr8 = sregs->cr8;
2054
2055 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 2056#ifdef CONFIG_X86_64
6aa8b732
AK		 2057 kvm_arch_ops->set_efer(vcpu, sregs->efer);
2058#endif
2059 vcpu->apic_base = sregs->apic_base;
2060
25c4c276 2061 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
399badf3 2062
6aa8b732 2063 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
f6528b03 2064 kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
6aa8b732
AK		 2065
2066 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2067 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 2068 if (!is_long_mode(vcpu) && is_pae(vcpu))
2069 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 2070
2071 if (mmu_reset_needed)
2072 kvm_mmu_reset_context(vcpu);
2073
2074 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2075 sizeof vcpu->irq_pending);
2076 vcpu->irq_summary = 0;
9eb829ce 2077 for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i)
6aa8b732
AK		 2078 if (vcpu->irq_pending[i])
2079 __set_bit(i, &vcpu->irq_summary);
2080
024aa1c0
AK		 2081 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2082 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2083 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2084 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2085 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2086 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2087
2088 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2089 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2090
6aa8b732
AK		 2091 vcpu_put(vcpu);
2092
2093 return 0;
2094}
2095
2096/*
2097 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2098 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 2099 *
2100 * This list is modified at module load time to reflect the
2101 * capabilities of the host cpu.
6aa8b732
AK		 2102 */
2103static u32 msrs_to_save[] = {
2104 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2105 MSR_K6_STAR,
05b3e0c2 2106#ifdef CONFIG_X86_64
6aa8b732
AK		 2107 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2108#endif
2109 MSR_IA32_TIME_STAMP_COUNTER,
2110};
2111
bf591b24
MR		 2112static unsigned num_msrs_to_save;
2113
6f00e68f
AK		 2114static u32 emulated_msrs[] = {
2115 MSR_IA32_MISC_ENABLE,
2116};
2117
bf591b24
MR		 2118static __init void kvm_init_msr_list(void)
2119{
2120 u32 dummy[2];
2121 unsigned i, j;
2122
2123 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2124 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2125 continue;
2126 if (j < i)
2127 msrs_to_save[j] = msrs_to_save[i];
2128 j++;
2129 }
2130 num_msrs_to_save = j;
2131}
6aa8b732
AK		 2132
2133/*
2134 * Adapt set_msr() to msr_io()'s calling convention
2135 */
2136static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2137{
35f3f286 2138 return kvm_set_msr(vcpu, index, *data);
6aa8b732
AK		 2139}
2140
2141/*
2142 * Read or write a bunch of msrs. All parameters are kernel addresses.
2143 *
2144 * @return number of msrs set successfully.
2145 */
bccf2150 2146static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
6aa8b732
AK		 2147 struct kvm_msr_entry *entries,
2148 int (*do_msr)(struct kvm_vcpu *vcpu,
2149 unsigned index, u64 *data))
2150{
6aa8b732
AK		 2151 int i;
2152
bccf2150 2153 vcpu_load(vcpu);
6aa8b732
AK		 2154
2155 for (i = 0; i < msrs->nmsrs; ++i)
2156 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2157 break;
2158
2159 vcpu_put(vcpu);
2160
2161 return i;
2162}
2163
2164/*
2165 * Read or write a bunch of msrs. Parameters are user addresses.
2166 *
2167 * @return number of msrs set successfully.
2168 */
bccf2150 2169static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
6aa8b732
AK		 2170 int (*do_msr)(struct kvm_vcpu *vcpu,
2171 unsigned index, u64 *data),
2172 int writeback)
2173{
2174 struct kvm_msrs msrs;
2175 struct kvm_msr_entry *entries;
2176 int r, n;
2177 unsigned size;
2178
2179 r = -EFAULT;
2180 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2181 goto out;
2182
2183 r = -E2BIG;
2184 if (msrs.nmsrs >= MAX_IO_MSRS)
2185 goto out;
2186
2187 r = -ENOMEM;
2188 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2189 entries = vmalloc(size);
2190 if (!entries)
2191 goto out;
2192
2193 r = -EFAULT;
2194 if (copy_from_user(entries, user_msrs->entries, size))
2195 goto out_free;
2196
bccf2150 2197 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
6aa8b732
AK		 2198 if (r < 0)
2199 goto out_free;
2200
2201 r = -EFAULT;
2202 if (writeback && copy_to_user(user_msrs->entries, entries, size))
2203 goto out_free;
2204
2205 r = n;
2206
2207out_free:
2208 vfree(entries);
2209out:
2210 return r;
2211}
2212
2213/*
2214 * Translate a guest virtual address to a guest physical address.
2215 */
bccf2150
AK		 2216static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2217 struct kvm_translation *tr)
6aa8b732
AK		 2218{
2219 unsigned long vaddr = tr->linear_address;
6aa8b732
AK		 2220 gpa_t gpa;
2221
bccf2150 2222 vcpu_load(vcpu);
11ec2804 2223 mutex_lock(&vcpu->kvm->lock);
6aa8b732
AK		 2224 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2225 tr->physical_address = gpa;
2226 tr->valid = gpa != UNMAPPED_GVA;
2227 tr->writeable = 1;
2228 tr->usermode = 0;
11ec2804 2229 mutex_unlock(&vcpu->kvm->lock);
6aa8b732
AK		 2230 vcpu_put(vcpu);
2231
2232 return 0;
2233}
2234
bccf2150
AK		 2235static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2236 struct kvm_interrupt *irq)
6aa8b732 2237{
6aa8b732
AK		 2238 if (irq->irq < 0 || irq->irq >= 256)
2239 return -EINVAL;
bccf2150 2240 vcpu_load(vcpu);
6aa8b732
AK		 2241
2242 set_bit(irq->irq, vcpu->irq_pending);
2243 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2244
2245 vcpu_put(vcpu);
2246
2247 return 0;
2248}
2249
bccf2150
AK		 2250static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2251 struct kvm_debug_guest *dbg)
6aa8b732 2252{
6aa8b732
AK		 2253 int r;
2254
bccf2150 2255 vcpu_load(vcpu);
6aa8b732
AK		 2256
2257 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
2258
2259 vcpu_put(vcpu);
2260
2261 return r;
2262}
2263
9a2bb7f4
AK		 2264static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2265 unsigned long address,
2266 int *type)
2267{
2268 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2269 unsigned long pgoff;
2270 struct page *page;
2271
9a2bb7f4 2272 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
039576c0
AK		 2273 if (pgoff == 0)
2274 page = virt_to_page(vcpu->run);
2275 else if (pgoff == KVM_PIO_PAGE_OFFSET)
2276 page = virt_to_page(vcpu->pio_data);
2277 else
9a2bb7f4 2278 return NOPAGE_SIGBUS;
9a2bb7f4 2279 get_page(page);
cd0d9137
NAQ		 2280 if (type != NULL)
2281 *type = VM_FAULT_MINOR;
2282
9a2bb7f4
AK		 2283 return page;
2284}
2285
2286static struct vm_operations_struct kvm_vcpu_vm_ops = {
2287 .nopage = kvm_vcpu_nopage,
2288};
2289
2290static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2291{
2292 vma->vm_ops = &kvm_vcpu_vm_ops;
2293 return 0;
2294}
2295
bccf2150
AK		 2296static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2297{
2298 struct kvm_vcpu *vcpu = filp->private_data;
2299
2300 fput(vcpu->kvm->filp);
2301 return 0;
2302}
2303
2304static struct file_operations kvm_vcpu_fops = {
2305 .release = kvm_vcpu_release,
2306 .unlocked_ioctl = kvm_vcpu_ioctl,
2307 .compat_ioctl = kvm_vcpu_ioctl,
9a2bb7f4 2308 .mmap = kvm_vcpu_mmap,
bccf2150
AK		 2309};
2310
2311/*
2312 * Allocates an inode for the vcpu.
2313 */
2314static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2315{
2316 int fd, r;
2317 struct inode *inode;
2318 struct file *file;
2319
d6d28168
AK		 2320 r = anon_inode_getfd(&fd, &inode, &file,
2321 "kvm-vcpu", &kvm_vcpu_fops, vcpu);
2322 if (r)
2323 return r;
bccf2150 2324 atomic_inc(&vcpu->kvm->filp->f_count);
bccf2150 2325 return fd;
bccf2150
AK		 2326}
2327
c5ea7660
AK		 2328/*
2329 * Creates some virtual cpus. Good luck creating more than one.
2330 */
2331static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2332{
2333 int r;
2334 struct kvm_vcpu *vcpu;
2335
c5ea7660 2336 if (!valid_vcpu(n))
fb3f0f51 2337 return -EINVAL;
c5ea7660 2338
fb3f0f51
RR		 2339 vcpu = kvm_arch_ops->vcpu_create(kvm, n);
2340 if (IS_ERR(vcpu))
2341 return PTR_ERR(vcpu);
c5ea7660 2342
15ad7146
AK		 2343 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2344
b114b080
RR		 2345 /* We do fxsave: this must be aligned. */
2346 BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
2347
fb3f0f51 2348 vcpu_load(vcpu);
c5ea7660 2349 r = kvm_mmu_setup(vcpu);
c5ea7660 2350 vcpu_put(vcpu);
c5ea7660 2351 if (r < 0)
fb3f0f51
RR		 2352 goto free_vcpu;
2353
11ec2804 2354 mutex_lock(&kvm->lock);
fb3f0f51
RR		 2355 if (kvm->vcpus[n]) {
2356 r = -EEXIST;
11ec2804 2357 mutex_unlock(&kvm->lock);
fb3f0f51
RR		 2358 goto mmu_unload;
2359 }
2360 kvm->vcpus[n] = vcpu;
11ec2804 2361 mutex_unlock(&kvm->lock);
c5ea7660 2362
fb3f0f51 2363 /* Now it's all set up, let userspace reach it */
bccf2150
AK		 2364 r = create_vcpu_fd(vcpu);
2365 if (r < 0)
fb3f0f51
RR		 2366 goto unlink;
2367 return r;
39c3b86e 2368
fb3f0f51 2369unlink:
11ec2804 2370 mutex_lock(&kvm->lock);
fb3f0f51 2371 kvm->vcpus[n] = NULL;
11ec2804 2372 mutex_unlock(&kvm->lock);
a2fa3e9f 2373
fb3f0f51
RR		 2374mmu_unload:
2375 vcpu_load(vcpu);
2376 kvm_mmu_unload(vcpu);
2377 vcpu_put(vcpu);
c5ea7660 2378
fb3f0f51
RR		 2379free_vcpu:
2380 kvm_arch_ops->vcpu_free(vcpu);
c5ea7660
AK		 2381 return r;
2382}
2383
2cc51560
ED		 2384static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2385{
2386 u64 efer;
2387 int i;
2388 struct kvm_cpuid_entry *e, *entry;
2389
2390 rdmsrl(MSR_EFER, efer);
2391 entry = NULL;
2392 for (i = 0; i < vcpu->cpuid_nent; ++i) {
2393 e = &vcpu->cpuid_entries[i];
2394 if (e->function == 0x80000001) {
2395 entry = e;
2396 break;
2397 }
2398 }
4c981b43 2399 if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) {
2cc51560 2400 entry->edx &= ~(1 << 20);
4c981b43 2401 printk(KERN_INFO "kvm: guest NX capability removed\n");
2cc51560
ED		 2402 }
2403}
2404
06465c5a
AK		 2405static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2406 struct kvm_cpuid *cpuid,
2407 struct kvm_cpuid_entry __user *entries)
2408{
2409 int r;
2410
2411 r = -E2BIG;
2412 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2413 goto out;
2414 r = -EFAULT;
2415 if (copy_from_user(&vcpu->cpuid_entries, entries,
2416 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2417 goto out;
2418 vcpu->cpuid_nent = cpuid->nent;
2cc51560 2419 cpuid_fix_nx_cap(vcpu);
06465c5a
AK		 2420 return 0;
2421
2422out:
2423 return r;
2424}
2425
1961d276
AK		 2426static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2427{
2428 if (sigset) {
2429 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2430 vcpu->sigset_active = 1;
2431 vcpu->sigset = *sigset;
2432 } else
2433 vcpu->sigset_active = 0;
2434 return 0;
2435}
2436
b8836737
AK		 2437/*
2438 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2439 * we have asm/x86/processor.h
2440 */
2441struct fxsave {
2442 u16 cwd;
2443 u16 swd;
2444 u16 twd;
2445 u16 fop;
2446 u64 rip;
2447 u64 rdp;
2448 u32 mxcsr;
2449 u32 mxcsr_mask;
2450 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2451#ifdef CONFIG_X86_64
2452 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2453#else
2454 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2455#endif
2456};
2457
2458static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2459{
b114b080 2460 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
b8836737
AK		 2461
2462 vcpu_load(vcpu);
2463
2464 memcpy(fpu->fpr, fxsave->st_space, 128);
2465 fpu->fcw = fxsave->cwd;
2466 fpu->fsw = fxsave->swd;
2467 fpu->ftwx = fxsave->twd;
2468 fpu->last_opcode = fxsave->fop;
2469 fpu->last_ip = fxsave->rip;
2470 fpu->last_dp = fxsave->rdp;
2471 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2472
2473 vcpu_put(vcpu);
2474
2475 return 0;
2476}
2477
2478static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2479{
b114b080 2480 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
b8836737
AK		 2481
2482 vcpu_load(vcpu);
2483
2484 memcpy(fxsave->st_space, fpu->fpr, 128);
2485 fxsave->cwd = fpu->fcw;
2486 fxsave->swd = fpu->fsw;
2487 fxsave->twd = fpu->ftwx;
2488 fxsave->fop = fpu->last_opcode;
2489 fxsave->rip = fpu->last_ip;
2490 fxsave->rdp = fpu->last_dp;
2491 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2492
2493 vcpu_put(vcpu);
2494
2495 return 0;
2496}
2497
bccf2150
AK		 2498static long kvm_vcpu_ioctl(struct file *filp,
2499 unsigned int ioctl, unsigned long arg)
6aa8b732 2500{
bccf2150 2501 struct kvm_vcpu *vcpu = filp->private_data;
2f366987 2502 void __user *argp = (void __user *)arg;
6aa8b732
AK		 2503 int r = -EINVAL;
2504
2505 switch (ioctl) {
9a2bb7f4 2506 case KVM_RUN:
f0fe5108
AK		 2507 r = -EINVAL;
2508 if (arg)
2509 goto out;
9a2bb7f4 2510 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
6aa8b732 2511 break;
6aa8b732
AK		 2512 case KVM_GET_REGS: {
2513 struct kvm_regs kvm_regs;
2514
bccf2150
AK		 2515 memset(&kvm_regs, 0, sizeof kvm_regs);
2516 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2517 if (r)
2518 goto out;
2519 r = -EFAULT;
2f366987 2520 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 2521 goto out;
2522 r = 0;
2523 break;
2524 }
2525 case KVM_SET_REGS: {
2526 struct kvm_regs kvm_regs;
2527
2528 r = -EFAULT;
2f366987 2529 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732 2530 goto out;
bccf2150 2531 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2532 if (r)
2533 goto out;
2534 r = 0;
2535 break;
2536 }
2537 case KVM_GET_SREGS: {
2538 struct kvm_sregs kvm_sregs;
2539
bccf2150
AK		 2540 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2541 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2542 if (r)
2543 goto out;
2544 r = -EFAULT;
2f366987 2545 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 2546 goto out;
2547 r = 0;
2548 break;
2549 }
2550 case KVM_SET_SREGS: {
2551 struct kvm_sregs kvm_sregs;
2552
2553 r = -EFAULT;
2f366987 2554 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732 2555 goto out;
bccf2150 2556 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2557 if (r)
2558 goto out;
2559 r = 0;
2560 break;
2561 }
2562 case KVM_TRANSLATE: {
2563 struct kvm_translation tr;
2564
2565 r = -EFAULT;
2f366987 2566 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732 2567 goto out;
bccf2150 2568 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
6aa8b732
AK		 2569 if (r)
2570 goto out;
2571 r = -EFAULT;
2f366987 2572 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 2573 goto out;
2574 r = 0;
2575 break;
2576 }
2577 case KVM_INTERRUPT: {
2578 struct kvm_interrupt irq;
2579
2580 r = -EFAULT;
2f366987 2581 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732 2582 goto out;
bccf2150 2583 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
6aa8b732
AK		 2584 if (r)
2585 goto out;
2586 r = 0;
2587 break;
2588 }
2589 case KVM_DEBUG_GUEST: {
2590 struct kvm_debug_guest dbg;
2591
2592 r = -EFAULT;
2f366987 2593 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732 2594 goto out;
bccf2150 2595 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
6aa8b732
AK		 2596 if (r)
2597 goto out;
2598 r = 0;
2599 break;
2600 }
bccf2150 2601 case KVM_GET_MSRS:
35f3f286 2602 r = msr_io(vcpu, argp, kvm_get_msr, 1);
bccf2150
AK		 2603 break;
2604 case KVM_SET_MSRS:
2605 r = msr_io(vcpu, argp, do_set_msr, 0);
2606 break;
06465c5a
AK		 2607 case KVM_SET_CPUID: {
2608 struct kvm_cpuid __user *cpuid_arg = argp;
2609 struct kvm_cpuid cpuid;
2610
2611 r = -EFAULT;
2612 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2613 goto out;
2614 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2615 if (r)
2616 goto out;
2617 break;
2618 }
1961d276
AK		 2619 case KVM_SET_SIGNAL_MASK: {
2620 struct kvm_signal_mask __user *sigmask_arg = argp;
2621 struct kvm_signal_mask kvm_sigmask;
2622 sigset_t sigset, *p;
2623
2624 p = NULL;
2625 if (argp) {
2626 r = -EFAULT;
2627 if (copy_from_user(&kvm_sigmask, argp,
2628 sizeof kvm_sigmask))
2629 goto out;
2630 r = -EINVAL;
2631 if (kvm_sigmask.len != sizeof sigset)
2632 goto out;
2633 r = -EFAULT;
2634 if (copy_from_user(&sigset, sigmask_arg->sigset,
2635 sizeof sigset))
2636 goto out;
2637 p = &sigset;
2638 }
2639 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2640 break;
2641 }
b8836737
AK		 2642 case KVM_GET_FPU: {
2643 struct kvm_fpu fpu;
2644
2645 memset(&fpu, 0, sizeof fpu);
2646 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
2647 if (r)
2648 goto out;
2649 r = -EFAULT;
2650 if (copy_to_user(argp, &fpu, sizeof fpu))
2651 goto out;
2652 r = 0;
2653 break;
2654 }
2655 case KVM_SET_FPU: {
2656 struct kvm_fpu fpu;
2657
2658 r = -EFAULT;
2659 if (copy_from_user(&fpu, argp, sizeof fpu))
2660 goto out;
2661 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
2662 if (r)
2663 goto out;
2664 r = 0;
2665 break;
2666 }
bccf2150
AK		 2667 default:
2668 ;
2669 }
2670out:
2671 return r;
2672}
2673
2674static long kvm_vm_ioctl(struct file *filp,
2675 unsigned int ioctl, unsigned long arg)
2676{
2677 struct kvm *kvm = filp->private_data;
2678 void __user *argp = (void __user *)arg;
2679 int r = -EINVAL;
2680
2681 switch (ioctl) {
2682 case KVM_CREATE_VCPU:
2683 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2684 if (r < 0)
2685 goto out;
2686 break;
6aa8b732
AK		 2687 case KVM_SET_MEMORY_REGION: {
2688 struct kvm_memory_region kvm_mem;
2689
2690 r = -EFAULT;
2f366987 2691 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
6aa8b732 2692 goto out;
2c6f5df9 2693 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
6aa8b732
AK		 2694 if (r)
2695 goto out;
2696 break;
2697 }
2698 case KVM_GET_DIRTY_LOG: {
2699 struct kvm_dirty_log log;
2700
2701 r = -EFAULT;
2f366987 2702 if (copy_from_user(&log, argp, sizeof log))
6aa8b732 2703 goto out;
2c6f5df9 2704 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
6aa8b732
AK		 2705 if (r)
2706 goto out;
2707 break;
2708 }
e8207547
AK		 2709 case KVM_SET_MEMORY_ALIAS: {
2710 struct kvm_memory_alias alias;
2711
2712 r = -EFAULT;
2713 if (copy_from_user(&alias, argp, sizeof alias))
2714 goto out;
2715 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
2716 if (r)
2717 goto out;
2718 break;
2719 }
f17abe9a
AK		 2720 default:
2721 ;
2722 }
2723out:
2724 return r;
2725}
2726
2727static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2728 unsigned long address,
2729 int *type)
2730{
2731 struct kvm *kvm = vma->vm_file->private_data;
2732 unsigned long pgoff;
f17abe9a
AK		 2733 struct page *page;
2734
f17abe9a 2735 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
954bbbc2 2736 page = gfn_to_page(kvm, pgoff);
f17abe9a
AK		 2737 if (!page)
2738 return NOPAGE_SIGBUS;
2739 get_page(page);
cd0d9137
NAQ		 2740 if (type != NULL)
2741 *type = VM_FAULT_MINOR;
2742
f17abe9a
AK		 2743 return page;
2744}
2745
2746static struct vm_operations_struct kvm_vm_vm_ops = {
2747 .nopage = kvm_vm_nopage,
2748};
2749
2750static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2751{
2752 vma->vm_ops = &kvm_vm_vm_ops;
2753 return 0;
2754}
2755
2756static struct file_operations kvm_vm_fops = {
2757 .release = kvm_vm_release,
2758 .unlocked_ioctl = kvm_vm_ioctl,
2759 .compat_ioctl = kvm_vm_ioctl,
2760 .mmap = kvm_vm_mmap,
2761};
2762
2763static int kvm_dev_ioctl_create_vm(void)
2764{
2765 int fd, r;
2766 struct inode *inode;
2767 struct file *file;
2768 struct kvm *kvm;
2769
f17abe9a 2770 kvm = kvm_create_vm();
d6d28168
AK		 2771 if (IS_ERR(kvm))
2772 return PTR_ERR(kvm);
2773 r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
2774 if (r) {
2775 kvm_destroy_vm(kvm);
2776 return r;
f17abe9a
AK		 2777 }
2778
bccf2150 2779 kvm->filp = file;
f17abe9a 2780
f17abe9a 2781 return fd;
f17abe9a
AK		 2782}
2783
2784static long kvm_dev_ioctl(struct file *filp,
2785 unsigned int ioctl, unsigned long arg)
2786{
2787 void __user *argp = (void __user *)arg;
07c45a36 2788 long r = -EINVAL;
f17abe9a
AK		 2789
2790 switch (ioctl) {
2791 case KVM_GET_API_VERSION:
f0fe5108
AK		 2792 r = -EINVAL;
2793 if (arg)
2794 goto out;
f17abe9a
AK		 2795 r = KVM_API_VERSION;
2796 break;
2797 case KVM_CREATE_VM:
f0fe5108
AK		 2798 r = -EINVAL;
2799 if (arg)
2800 goto out;
f17abe9a
AK		 2801 r = kvm_dev_ioctl_create_vm();
2802 break;
6aa8b732 2803 case KVM_GET_MSR_INDEX_LIST: {
2f366987 2804 struct kvm_msr_list __user *user_msr_list = argp;
6aa8b732
AK		 2805 struct kvm_msr_list msr_list;
2806 unsigned n;
2807
2808 r = -EFAULT;
2809 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2810 goto out;
2811 n = msr_list.nmsrs;
6f00e68f 2812 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
6aa8b732
AK		 2813 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2814 goto out;
2815 r = -E2BIG;
bf591b24 2816 if (n < num_msrs_to_save)
6aa8b732
AK		 2817 goto out;
2818 r = -EFAULT;
2819 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 2820 num_msrs_to_save * sizeof(u32)))
6aa8b732 2821 goto out;
6f00e68f
AK		 2822 if (copy_to_user(user_msr_list->indices
2823 + num_msrs_to_save * sizeof(u32),
2824 &emulated_msrs,
2825 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2826 goto out;
6aa8b732 2827 r = 0;
cc1d8955 2828 break;
6aa8b732 2829 }
5d308f45
AK		 2830 case KVM_CHECK_EXTENSION:
2831 /*
2832 * No extensions defined at present.
2833 */
2834 r = 0;
2835 break;
07c45a36
AK		 2836 case KVM_GET_VCPU_MMAP_SIZE:
2837 r = -EINVAL;
2838 if (arg)
2839 goto out;
039576c0 2840 r = 2 * PAGE_SIZE;
07c45a36 2841 break;
6aa8b732
AK		 2842 default:
2843 ;
2844 }
2845out:
2846 return r;
2847}
2848
6aa8b732
AK		 2849static struct file_operations kvm_chardev_ops = {
2850 .open = kvm_dev_open,
2851 .release = kvm_dev_release,
2852 .unlocked_ioctl = kvm_dev_ioctl,
2853 .compat_ioctl = kvm_dev_ioctl,
6aa8b732
AK		 2854};
2855
2856static struct miscdevice kvm_dev = {
bbe4432e 2857 KVM_MINOR,
6aa8b732
AK		 2858 "kvm",
2859 &kvm_chardev_ops,
2860};
2861
774c47f1
AK		 2862/*
2863 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2864 * cached on it.
2865 */
2866static void decache_vcpus_on_cpu(int cpu)
2867{
2868 struct kvm *vm;
2869 struct kvm_vcpu *vcpu;
2870 int i;
2871
2872 spin_lock(&kvm_lock);
11ec2804 2873 list_for_each_entry(vm, &vm_list, vm_list)
774c47f1 2874 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
fb3f0f51
RR		 2875 vcpu = vm->vcpus[i];
2876 if (!vcpu)
2877 continue;
774c47f1
AK		 2878 /*
2879 * If the vcpu is locked, then it is running on some
2880 * other cpu and therefore it is not cached on the
2881 * cpu in question.
2882 *
2883 * If it's not locked, check the last cpu it executed
2884 * on.
2885 */
2886 if (mutex_trylock(&vcpu->mutex)) {
2887 if (vcpu->cpu == cpu) {
2888 kvm_arch_ops->vcpu_decache(vcpu);
2889 vcpu->cpu = -1;
2890 }
2891 mutex_unlock(&vcpu->mutex);
2892 }
2893 }
2894 spin_unlock(&kvm_lock);
2895}
2896
1b6c0168
AK		 2897static void hardware_enable(void *junk)
2898{
2899 int cpu = raw_smp_processor_id();
2900
2901 if (cpu_isset(cpu, cpus_hardware_enabled))
2902 return;
2903 cpu_set(cpu, cpus_hardware_enabled);
2904 kvm_arch_ops->hardware_enable(NULL);
2905}
2906
2907static void hardware_disable(void *junk)
2908{
2909 int cpu = raw_smp_processor_id();
2910
2911 if (!cpu_isset(cpu, cpus_hardware_enabled))
2912 return;
2913 cpu_clear(cpu, cpus_hardware_enabled);
2914 decache_vcpus_on_cpu(cpu);
2915 kvm_arch_ops->hardware_disable(NULL);
2916}
2917
774c47f1
AK		 2918static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2919 void *v)
2920{
2921 int cpu = (long)v;
2922
2923 switch (val) {
cec9ad27
AK		 2924 case CPU_DYING:
2925 case CPU_DYING_FROZEN:
6ec8a856
AK		 2926 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2927 cpu);
2928 hardware_disable(NULL);
2929 break;
774c47f1 2930 case CPU_UP_CANCELED:
8bb78442 2931 case CPU_UP_CANCELED_FROZEN:
43934a38
JK		 2932 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2933 cpu);
1b6c0168 2934 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
774c47f1 2935 break;
43934a38 2936 case CPU_ONLINE:
8bb78442 2937 case CPU_ONLINE_FROZEN:
43934a38
JK		 2938 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2939 cpu);
1b6c0168 2940 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
774c47f1
AK		 2941 break;
2942 }
2943 return NOTIFY_OK;
2944}
2945
9a2b85c6
RR		 2946static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2947 void *v)
2948{
2949 if (val == SYS_RESTART) {
2950 /*
2951 * Some (well, at least mine) BIOSes hang on reboot if
2952 * in vmx root mode.
2953 */
2954 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2955 on_each_cpu(hardware_disable, NULL, 0, 1);
2956 }
2957 return NOTIFY_OK;
2958}
2959
2960static struct notifier_block kvm_reboot_notifier = {
2961 .notifier_call = kvm_reboot,
2962 .priority = 0,
2963};
2964
2eeb2e94
GH		 2965void kvm_io_bus_init(struct kvm_io_bus *bus)
2966{
2967 memset(bus, 0, sizeof(*bus));
2968}
2969
2970void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2971{
2972 int i;
2973
2974 for (i = 0; i < bus->dev_count; i++) {
2975 struct kvm_io_device *pos = bus->devs[i];
2976
2977 kvm_iodevice_destructor(pos);
2978 }
2979}
2980
2981struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
2982{
2983 int i;
2984
2985 for (i = 0; i < bus->dev_count; i++) {
2986 struct kvm_io_device *pos = bus->devs[i];
2987
2988 if (pos->in_range(pos, addr))
2989 return pos;
2990 }
2991
2992 return NULL;
2993}
2994
2995void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
2996{
2997 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
2998
2999 bus->devs[bus->dev_count++] = dev;
3000}
3001
774c47f1
AK		 3002static struct notifier_block kvm_cpu_notifier = {
3003 .notifier_call = kvm_cpu_hotplug,
3004 .priority = 20, /* must be > scheduler priority */
3005};
3006
1165f5fe
AK		 3007static u64 stat_get(void *_offset)
3008{
3009 unsigned offset = (long)_offset;
3010 u64 total = 0;
3011 struct kvm *kvm;
3012 struct kvm_vcpu *vcpu;
3013 int i;
3014
3015 spin_lock(&kvm_lock);
3016 list_for_each_entry(kvm, &vm_list, vm_list)
3017 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
fb3f0f51
RR		 3018 vcpu = kvm->vcpus[i];
3019 if (vcpu)
3020 total += *(u32 *)((void *)vcpu + offset);
1165f5fe
AK		 3021 }
3022 spin_unlock(&kvm_lock);
3023 return total;
3024}
3025
3026static void stat_set(void *offset, u64 val)
3027{
3028}
3029
3030DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, stat_set, "%llu\n");
3031
6aa8b732
AK		 3032static __init void kvm_init_debug(void)
3033{
3034 struct kvm_stats_debugfs_item *p;
3035
8b6d44c7 3036 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732 3037 for (p = debugfs_entries; p->name; ++p)
1165f5fe
AK		 3038 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
3039 (void *)(long)p->offset,
3040 &stat_fops);
6aa8b732
AK		 3041}
3042
3043static void kvm_exit_debug(void)
3044{
3045 struct kvm_stats_debugfs_item *p;
3046
3047 for (p = debugfs_entries; p->name; ++p)
3048 debugfs_remove(p->dentry);
3049 debugfs_remove(debugfs_dir);
3050}
3051
59ae6c6b
AK		 3052static int kvm_suspend(struct sys_device *dev, pm_message_t state)
3053{
4267c41a 3054 hardware_disable(NULL);
59ae6c6b
AK		 3055 return 0;
3056}
3057
3058static int kvm_resume(struct sys_device *dev)
3059{
4267c41a 3060 hardware_enable(NULL);
59ae6c6b
AK		 3061 return 0;
3062}
3063
3064static struct sysdev_class kvm_sysdev_class = {
3065 set_kset_name("kvm"),
3066 .suspend = kvm_suspend,
3067 .resume = kvm_resume,
3068};
3069
3070static struct sys_device kvm_sysdev = {
3071 .id = 0,
3072 .cls = &kvm_sysdev_class,
3073};
3074
6aa8b732
AK		 3075hpa_t bad_page_address;
3076
15ad7146
AK		 3077static inline
3078struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3079{
3080 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3081}
3082
3083static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3084{
3085 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3086
3087 kvm_arch_ops->vcpu_load(vcpu, cpu);
3088}
3089
3090static void kvm_sched_out(struct preempt_notifier *pn,
3091 struct task_struct *next)
3092{
3093 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3094
3095 kvm_arch_ops->vcpu_put(vcpu);
3096}
3097
c16f862d
RR		 3098int kvm_init_arch(struct kvm_arch_ops *ops, unsigned int vcpu_size,
3099 struct module *module)
6aa8b732
AK		 3100{
3101 int r;
3102
09db28b8
YI		 3103 if (kvm_arch_ops) {
3104 printk(KERN_ERR "kvm: already loaded the other module\n");
3105 return -EEXIST;
3106 }
3107
e097f35c 3108 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 3109 printk(KERN_ERR "kvm: no hardware support\n");
3110 return -EOPNOTSUPP;
3111 }
e097f35c 3112 if (ops->disabled_by_bios()) {
6aa8b732
AK		 3113 printk(KERN_ERR "kvm: disabled by bios\n");
3114 return -EOPNOTSUPP;
3115 }
3116
e097f35c
YI		 3117 kvm_arch_ops = ops;
3118
6aa8b732
AK		 3119 r = kvm_arch_ops->hardware_setup();
3120 if (r < 0)
ca45aaae 3121 goto out;
6aa8b732 3122
1b6c0168 3123 on_each_cpu(hardware_enable, NULL, 0, 1);
774c47f1
AK		 3124 r = register_cpu_notifier(&kvm_cpu_notifier);
3125 if (r)
3126 goto out_free_1;
6aa8b732
AK		 3127 register_reboot_notifier(&kvm_reboot_notifier);
3128
59ae6c6b
AK		 3129 r = sysdev_class_register(&kvm_sysdev_class);
3130 if (r)
3131 goto out_free_2;
3132
3133 r = sysdev_register(&kvm_sysdev);
3134 if (r)
3135 goto out_free_3;
3136
c16f862d
RR		 3137 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3138 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
3139 __alignof__(struct kvm_vcpu), 0, 0);
3140 if (!kvm_vcpu_cache) {
3141 r = -ENOMEM;
3142 goto out_free_4;
3143 }
3144
6aa8b732
AK		 3145 kvm_chardev_ops.owner = module;
3146
3147 r = misc_register(&kvm_dev);
3148 if (r) {
3149 printk (KERN_ERR "kvm: misc device register failed\n");
3150 goto out_free;
3151 }
3152
15ad7146
AK		 3153 kvm_preempt_ops.sched_in = kvm_sched_in;
3154 kvm_preempt_ops.sched_out = kvm_sched_out;
3155
6aa8b732
AK		 3156 return r;
3157
3158out_free:
c16f862d
RR		 3159 kmem_cache_destroy(kvm_vcpu_cache);
3160out_free_4:
59ae6c6b
AK		 3161 sysdev_unregister(&kvm_sysdev);
3162out_free_3:
3163 sysdev_class_unregister(&kvm_sysdev_class);
3164out_free_2:
6aa8b732 3165 unregister_reboot_notifier(&kvm_reboot_notifier);
774c47f1
AK		 3166 unregister_cpu_notifier(&kvm_cpu_notifier);
3167out_free_1:
1b6c0168 3168 on_each_cpu(hardware_disable, NULL, 0, 1);
6aa8b732 3169 kvm_arch_ops->hardware_unsetup();
ca45aaae
AK		 3170out:
3171 kvm_arch_ops = NULL;
6aa8b732
AK		 3172 return r;
3173}
3174
3175void kvm_exit_arch(void)
3176{
3177 misc_deregister(&kvm_dev);
c16f862d 3178 kmem_cache_destroy(kvm_vcpu_cache);
59ae6c6b
AK		 3179 sysdev_unregister(&kvm_sysdev);
3180 sysdev_class_unregister(&kvm_sysdev_class);
6aa8b732 3181 unregister_reboot_notifier(&kvm_reboot_notifier);
59ae6c6b 3182 unregister_cpu_notifier(&kvm_cpu_notifier);
1b6c0168 3183 on_each_cpu(hardware_disable, NULL, 0, 1);
6aa8b732 3184 kvm_arch_ops->hardware_unsetup();
09db28b8 3185 kvm_arch_ops = NULL;
6aa8b732
AK		 3186}
3187
3188static __init int kvm_init(void)
3189{
3190 static struct page *bad_page;
37e29d90
AK		 3191 int r;
3192
b5a33a75
AK		 3193 r = kvm_mmu_module_init();
3194 if (r)
3195 goto out4;
3196
6aa8b732
AK		 3197 kvm_init_debug();
3198
bf591b24
MR		 3199 kvm_init_msr_list();
3200
6aa8b732
AK		 3201 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3202 r = -ENOMEM;
3203 goto out;
3204 }
3205
3206 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3207 memset(__va(bad_page_address), 0, PAGE_SIZE);
3208
58e690e6 3209 return 0;
6aa8b732
AK		 3210
3211out:
3212 kvm_exit_debug();
b5a33a75
AK		 3213 kvm_mmu_module_exit();
3214out4:
6aa8b732
AK		 3215 return r;
3216}
3217
3218static __exit void kvm_exit(void)
3219{
3220 kvm_exit_debug();
3221 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
b5a33a75 3222 kvm_mmu_module_exit();
6aa8b732
AK		 3223}
3224
3225module_init(kvm_init)
3226module_exit(kvm_exit)
3227
3228EXPORT_SYMBOL_GPL(kvm_init_arch);
3229EXPORT_SYMBOL_GPL(kvm_exit_arch);
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