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KVM: Remove arch specific components from the general code
[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;
1165f5fe
AK		 56
57#define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
6aa8b732
AK		 58
59static struct kvm_stats_debugfs_item {
60 const char *name;
1165f5fe 61 int offset;
6aa8b732
AK		 62 struct dentry *dentry;
63} debugfs_entries[] = {
1165f5fe
AK		 64 { "pf_fixed", STAT_OFFSET(pf_fixed) },
65 { "pf_guest", STAT_OFFSET(pf_guest) },
66 { "tlb_flush", STAT_OFFSET(tlb_flush) },
67 { "invlpg", STAT_OFFSET(invlpg) },
68 { "exits", STAT_OFFSET(exits) },
69 { "io_exits", STAT_OFFSET(io_exits) },
70 { "mmio_exits", STAT_OFFSET(mmio_exits) },
71 { "signal_exits", STAT_OFFSET(signal_exits) },
72 { "irq_window", STAT_OFFSET(irq_window_exits) },
73 { "halt_exits", STAT_OFFSET(halt_exits) },
74 { "request_irq", STAT_OFFSET(request_irq_exits) },
75 { "irq_exits", STAT_OFFSET(irq_exits) },
e6adf283 76 { "light_exits", STAT_OFFSET(light_exits) },
2cc51560 77 { "efer_reload", STAT_OFFSET(efer_reload) },
1165f5fe 78 { NULL }
6aa8b732
AK		 79};
80
81static struct dentry *debugfs_dir;
82
83#define MAX_IO_MSRS 256
84
707d92fa
RR		 85#define CR0_RESERVED_BITS \
86 (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
87 | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
88 | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
66aee91a
RR		 89#define CR4_RESERVED_BITS \
90 (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
91 | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
92 | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \
93 | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
94
7075bc81 95#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
6aa8b732
AK		 96#define EFER_RESERVED_BITS 0xfffffffffffff2fe
97
05b3e0c2 98#ifdef CONFIG_X86_64
6aa8b732
AK		 99// LDT or TSS descriptor in the GDT. 16 bytes.
100struct segment_descriptor_64 {
101 struct segment_descriptor s;
102 u32 base_higher;
103 u32 pad_zero;
104};
105
106#endif
107
bccf2150
AK		 108static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
109 unsigned long arg);
110
6aa8b732
AK		 111unsigned long segment_base(u16 selector)
112{
113 struct descriptor_table gdt;
114 struct segment_descriptor *d;
115 unsigned long table_base;
116 typedef unsigned long ul;
117 unsigned long v;
118
119 if (selector == 0)
120 return 0;
121
122 asm ("sgdt %0" : "=m"(gdt));
123 table_base = gdt.base;
124
125 if (selector & 4) { /* from ldt */
126 u16 ldt_selector;
127
128 asm ("sldt %0" : "=g"(ldt_selector));
129 table_base = segment_base(ldt_selector);
130 }
131 d = (struct segment_descriptor *)(table_base + (selector & ~7));
132 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
05b3e0c2 133#ifdef CONFIG_X86_64
6aa8b732
AK		 134 if (d->system == 0
135 && (d->type == 2 || d->type == 9 || d->type == 11))
136 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
137#endif
138 return v;
139}
140EXPORT_SYMBOL_GPL(segment_base);
141
5aacf0ca
JM		 142static inline int valid_vcpu(int n)
143{
144 return likely(n >= 0 && n < KVM_MAX_VCPUS);
145}
146
d27d4aca
AK		 147int kvm_read_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
148 void *dest)
6aa8b732
AK		 149{
150 unsigned char *host_buf = dest;
151 unsigned long req_size = size;
152
153 while (size) {
154 hpa_t paddr;
155 unsigned now;
156 unsigned offset;
157 hva_t guest_buf;
158
159 paddr = gva_to_hpa(vcpu, addr);
160
161 if (is_error_hpa(paddr))
162 break;
163
164 guest_buf = (hva_t)kmap_atomic(
165 pfn_to_page(paddr >> PAGE_SHIFT),
166 KM_USER0);
167 offset = addr & ~PAGE_MASK;
168 guest_buf |= offset;
169 now = min(size, PAGE_SIZE - offset);
170 memcpy(host_buf, (void*)guest_buf, now);
171 host_buf += now;
172 addr += now;
173 size -= now;
174 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
175 }
176 return req_size - size;
177}
178EXPORT_SYMBOL_GPL(kvm_read_guest);
179
d27d4aca
AK		 180int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
181 void *data)
6aa8b732
AK		 182{
183 unsigned char *host_buf = data;
184 unsigned long req_size = size;
185
186 while (size) {
187 hpa_t paddr;
188 unsigned now;
189 unsigned offset;
190 hva_t guest_buf;
ab51a434 191 gfn_t gfn;
6aa8b732
AK		 192
193 paddr = gva_to_hpa(vcpu, addr);
194
195 if (is_error_hpa(paddr))
196 break;
197
ab51a434
UL		 198 gfn = vcpu->mmu.gva_to_gpa(vcpu, addr) >> PAGE_SHIFT;
199 mark_page_dirty(vcpu->kvm, gfn);
6aa8b732
AK		 200 guest_buf = (hva_t)kmap_atomic(
201 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
202 offset = addr & ~PAGE_MASK;
203 guest_buf |= offset;
204 now = min(size, PAGE_SIZE - offset);
205 memcpy((void*)guest_buf, host_buf, now);
206 host_buf += now;
207 addr += now;
208 size -= now;
209 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
210 }
211 return req_size - size;
212}
213EXPORT_SYMBOL_GPL(kvm_write_guest);
214
7702fd1f
AK		 215void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
216{
217 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
218 return;
219
220 vcpu->guest_fpu_loaded = 1;
221 fx_save(vcpu->host_fx_image);
222 fx_restore(vcpu->guest_fx_image);
223}
224EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
225
226void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
227{
228 if (!vcpu->guest_fpu_loaded)
229 return;
230
231 vcpu->guest_fpu_loaded = 0;
232 fx_save(vcpu->guest_fx_image);
233 fx_restore(vcpu->host_fx_image);
234}
235EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
236
bccf2150
AK		 237/*
238 * Switches to specified vcpu, until a matching vcpu_put()
239 */
240static void vcpu_load(struct kvm_vcpu *vcpu)
6aa8b732 241{
bccf2150
AK		 242 mutex_lock(&vcpu->mutex);
243 kvm_arch_ops->vcpu_load(vcpu);
6aa8b732
AK		 244}
245
6aa8b732
AK		 246static void vcpu_put(struct kvm_vcpu *vcpu)
247{
248 kvm_arch_ops->vcpu_put(vcpu);
6aa8b732
AK		 249 mutex_unlock(&vcpu->mutex);
250}
251
d9e368d6
AK		 252static void ack_flush(void *_completed)
253{
254 atomic_t *completed = _completed;
255
256 atomic_inc(completed);
257}
258
259void kvm_flush_remote_tlbs(struct kvm *kvm)
260{
261 int i, cpu, needed;
262 cpumask_t cpus;
263 struct kvm_vcpu *vcpu;
264 atomic_t completed;
265
266 atomic_set(&completed, 0);
267 cpus_clear(cpus);
268 needed = 0;
269 for (i = 0; i < kvm->nvcpus; ++i) {
270 vcpu = &kvm->vcpus[i];
271 if (test_and_set_bit(KVM_TLB_FLUSH, &vcpu->requests))
272 continue;
273 cpu = vcpu->cpu;
274 if (cpu != -1 && cpu != raw_smp_processor_id())
275 if (!cpu_isset(cpu, cpus)) {
276 cpu_set(cpu, cpus);
277 ++needed;
278 }
279 }
280
281 /*
282 * We really want smp_call_function_mask() here. But that's not
283 * available, so ipi all cpus in parallel and wait for them
284 * to complete.
285 */
286 for (cpu = first_cpu(cpus); cpu != NR_CPUS; cpu = next_cpu(cpu, cpus))
287 smp_call_function_single(cpu, ack_flush, &completed, 1, 0);
288 while (atomic_read(&completed) != needed) {
289 cpu_relax();
290 barrier();
291 }
292}
293
f17abe9a 294static struct kvm *kvm_create_vm(void)
6aa8b732
AK		 295{
296 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
297 int i;
298
299 if (!kvm)
f17abe9a 300 return ERR_PTR(-ENOMEM);
6aa8b732 301
74906345 302 kvm_io_bus_init(&kvm->pio_bus);
6aa8b732
AK		 303 spin_lock_init(&kvm->lock);
304 INIT_LIST_HEAD(&kvm->active_mmu_pages);
2eeb2e94 305 kvm_io_bus_init(&kvm->mmio_bus);
6aa8b732
AK		 306 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
307 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
308
309 mutex_init(&vcpu->mutex);
133de902 310 vcpu->cpu = -1;
86a2b42e 311 vcpu->kvm = kvm;
6aa8b732 312 vcpu->mmu.root_hpa = INVALID_PAGE;
6aa8b732 313 }
5e58cfe4
RR		 314 spin_lock(&kvm_lock);
315 list_add(&kvm->vm_list, &vm_list);
316 spin_unlock(&kvm_lock);
f17abe9a
AK		 317 return kvm;
318}
319
320static int kvm_dev_open(struct inode *inode, struct file *filp)
321{
6aa8b732
AK		 322 return 0;
323}
324
325/*
326 * Free any memory in @free but not in @dont.
327 */
328static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
329 struct kvm_memory_slot *dont)
330{
331 int i;
332
333 if (!dont || free->phys_mem != dont->phys_mem)
334 if (free->phys_mem) {
335 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 336 if (free->phys_mem[i])
337 __free_page(free->phys_mem[i]);
6aa8b732
AK		 338 vfree(free->phys_mem);
339 }
340
341 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
342 vfree(free->dirty_bitmap);
343
8b6d44c7 344 free->phys_mem = NULL;
6aa8b732 345 free->npages = 0;
8b6d44c7 346 free->dirty_bitmap = NULL;
6aa8b732
AK		 347}
348
349static void kvm_free_physmem(struct kvm *kvm)
350{
351 int i;
352
353 for (i = 0; i < kvm->nmemslots; ++i)
8b6d44c7 354 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
6aa8b732
AK		 355}
356
039576c0
AK		 357static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
358{
359 int i;
360
361 for (i = 0; i < 2; ++i)
362 if (vcpu->pio.guest_pages[i]) {
363 __free_page(vcpu->pio.guest_pages[i]);
364 vcpu->pio.guest_pages[i] = NULL;
365 }
366}
367
7b53aa56
AK		 368static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
369{
a2fa3e9f 370 if (!vcpu->valid)
7b53aa56
AK		 371 return;
372
373 vcpu_load(vcpu);
374 kvm_mmu_unload(vcpu);
375 vcpu_put(vcpu);
376}
377
6aa8b732
AK		 378static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
379{
a2fa3e9f 380 if (!vcpu->valid)
1e8ba6fb
IM		 381 return;
382
bccf2150 383 vcpu_load(vcpu);
6aa8b732 384 kvm_mmu_destroy(vcpu);
08438475 385 vcpu_put(vcpu);
9ede74e0 386 kvm_arch_ops->vcpu_free(vcpu);
9a2bb7f4
AK		 387 free_page((unsigned long)vcpu->run);
388 vcpu->run = NULL;
039576c0
AK		 389 free_page((unsigned long)vcpu->pio_data);
390 vcpu->pio_data = NULL;
391 free_pio_guest_pages(vcpu);
6aa8b732
AK		 392}
393
394static void kvm_free_vcpus(struct kvm *kvm)
395{
396 unsigned int i;
397
7b53aa56
AK		 398 /*
399 * Unpin any mmu pages first.
400 */
401 for (i = 0; i < KVM_MAX_VCPUS; ++i)
402 kvm_unload_vcpu_mmu(&kvm->vcpus[i]);
6aa8b732
AK		 403 for (i = 0; i < KVM_MAX_VCPUS; ++i)
404 kvm_free_vcpu(&kvm->vcpus[i]);
405}
406
407static int kvm_dev_release(struct inode *inode, struct file *filp)
408{
f17abe9a
AK		 409 return 0;
410}
6aa8b732 411
f17abe9a
AK		 412static void kvm_destroy_vm(struct kvm *kvm)
413{
133de902
AK		 414 spin_lock(&kvm_lock);
415 list_del(&kvm->vm_list);
416 spin_unlock(&kvm_lock);
74906345 417 kvm_io_bus_destroy(&kvm->pio_bus);
2eeb2e94 418 kvm_io_bus_destroy(&kvm->mmio_bus);
6aa8b732
AK		 419 kvm_free_vcpus(kvm);
420 kvm_free_physmem(kvm);
421 kfree(kvm);
f17abe9a
AK		 422}
423
424static int kvm_vm_release(struct inode *inode, struct file *filp)
425{
426 struct kvm *kvm = filp->private_data;
427
428 kvm_destroy_vm(kvm);
6aa8b732
AK		 429 return 0;
430}
431
432static void inject_gp(struct kvm_vcpu *vcpu)
433{
434 kvm_arch_ops->inject_gp(vcpu, 0);
435}
436
1342d353
AK		 437/*
438 * Load the pae pdptrs. Return true is they are all valid.
439 */
440static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
6aa8b732
AK		 441{
442 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
1342d353 443 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
6aa8b732 444 int i;
6aa8b732 445 u64 *pdpt;
1342d353 446 int ret;
954bbbc2 447 struct page *page;
c820c2aa 448 u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)];
6aa8b732
AK		 449
450 spin_lock(&vcpu->kvm->lock);
954bbbc2 451 page = gfn_to_page(vcpu->kvm, pdpt_gfn);
c820c2aa
RR		 452 if (!page) {
453 ret = 0;
454 goto out;
455 }
456
954bbbc2 457 pdpt = kmap_atomic(page, KM_USER0);
c820c2aa
RR		 458 memcpy(pdpte, pdpt+offset, sizeof(pdpte));
459 kunmap_atomic(pdpt, KM_USER0);
6aa8b732 460
c820c2aa
RR		 461 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
462 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
1342d353
AK		 463 ret = 0;
464 goto out;
465 }
6aa8b732 466 }
c820c2aa 467 ret = 1;
6aa8b732 468
c820c2aa 469 memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs));
1342d353 470out:
6aa8b732
AK		 471 spin_unlock(&vcpu->kvm->lock);
472
1342d353 473 return ret;
6aa8b732
AK		 474}
475
476void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
477{
707d92fa 478 if (cr0 & CR0_RESERVED_BITS) {
6aa8b732
AK		 479 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
480 cr0, vcpu->cr0);
481 inject_gp(vcpu);
482 return;
483 }
484
707d92fa 485 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
6aa8b732
AK		 486 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
487 inject_gp(vcpu);
488 return;
489 }
490
707d92fa 491 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
6aa8b732
AK		 492 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
493 "and a clear PE flag\n");
494 inject_gp(vcpu);
495 return;
496 }
497
707d92fa 498 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
05b3e0c2 499#ifdef CONFIG_X86_64
6aa8b732
AK		 500 if ((vcpu->shadow_efer & EFER_LME)) {
501 int cs_db, cs_l;
502
503 if (!is_pae(vcpu)) {
504 printk(KERN_DEBUG "set_cr0: #GP, start paging "
505 "in long mode while PAE is disabled\n");
506 inject_gp(vcpu);
507 return;
508 }
509 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
510 if (cs_l) {
511 printk(KERN_DEBUG "set_cr0: #GP, start paging "
512 "in long mode while CS.L == 1\n");
513 inject_gp(vcpu);
514 return;
515
516 }
517 } else
518#endif
1342d353 519 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 520 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
521 "reserved bits\n");
522 inject_gp(vcpu);
523 return;
524 }
525
526 }
527
528 kvm_arch_ops->set_cr0(vcpu, cr0);
529 vcpu->cr0 = cr0;
530
531 spin_lock(&vcpu->kvm->lock);
532 kvm_mmu_reset_context(vcpu);
533 spin_unlock(&vcpu->kvm->lock);
534 return;
535}
536EXPORT_SYMBOL_GPL(set_cr0);
537
538void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
539{
540 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
541}
542EXPORT_SYMBOL_GPL(lmsw);
543
544void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
545{
66aee91a 546 if (cr4 & CR4_RESERVED_BITS) {
6aa8b732
AK		 547 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
548 inject_gp(vcpu);
549 return;
550 }
551
a9058ecd 552 if (is_long_mode(vcpu)) {
66aee91a 553 if (!(cr4 & X86_CR4_PAE)) {
6aa8b732
AK		 554 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
555 "in long mode\n");
556 inject_gp(vcpu);
557 return;
558 }
66aee91a 559 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
1342d353 560 && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 561 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
562 inject_gp(vcpu);
310bc76c 563 return;
6aa8b732
AK		 564 }
565
66aee91a 566 if (cr4 & X86_CR4_VMXE) {
6aa8b732
AK		 567 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
568 inject_gp(vcpu);
569 return;
570 }
571 kvm_arch_ops->set_cr4(vcpu, cr4);
572 spin_lock(&vcpu->kvm->lock);
573 kvm_mmu_reset_context(vcpu);
574 spin_unlock(&vcpu->kvm->lock);
575}
576EXPORT_SYMBOL_GPL(set_cr4);
577
578void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
579{
a9058ecd 580 if (is_long_mode(vcpu)) {
f802a307 581 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
6aa8b732
AK		 582 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
583 inject_gp(vcpu);
584 return;
585 }
586 } else {
f802a307
RR		 587 if (is_pae(vcpu)) {
588 if (cr3 & CR3_PAE_RESERVED_BITS) {
589 printk(KERN_DEBUG
590 "set_cr3: #GP, reserved bits\n");
591 inject_gp(vcpu);
592 return;
593 }
594 if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
595 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
596 "reserved bits\n");
597 inject_gp(vcpu);
598 return;
599 }
600 } else {
601 if (cr3 & CR3_NONPAE_RESERVED_BITS) {
602 printk(KERN_DEBUG
603 "set_cr3: #GP, reserved bits\n");
604 inject_gp(vcpu);
605 return;
606 }
6aa8b732
AK		 607 }
608 }
609
610 vcpu->cr3 = cr3;
611 spin_lock(&vcpu->kvm->lock);
d21225ee
IM		 612 /*
613 * Does the new cr3 value map to physical memory? (Note, we
614 * catch an invalid cr3 even in real-mode, because it would
615 * cause trouble later on when we turn on paging anyway.)
616 *
617 * A real CPU would silently accept an invalid cr3 and would
618 * attempt to use it - with largely undefined (and often hard
619 * to debug) behavior on the guest side.
620 */
621 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
622 inject_gp(vcpu);
623 else
624 vcpu->mmu.new_cr3(vcpu);
6aa8b732
AK		 625 spin_unlock(&vcpu->kvm->lock);
626}
627EXPORT_SYMBOL_GPL(set_cr3);
628
629void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
630{
7075bc81 631 if (cr8 & CR8_RESERVED_BITS) {
6aa8b732
AK		 632 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
633 inject_gp(vcpu);
634 return;
635 }
636 vcpu->cr8 = cr8;
637}
638EXPORT_SYMBOL_GPL(set_cr8);
639
640void fx_init(struct kvm_vcpu *vcpu)
641{
642 struct __attribute__ ((__packed__)) fx_image_s {
643 u16 control; //fcw
644 u16 status; //fsw
645 u16 tag; // ftw
646 u16 opcode; //fop
647 u64 ip; // fpu ip
648 u64 operand;// fpu dp
649 u32 mxcsr;
650 u32 mxcsr_mask;
651
652 } *fx_image;
653
654 fx_save(vcpu->host_fx_image);
655 fpu_init();
656 fx_save(vcpu->guest_fx_image);
657 fx_restore(vcpu->host_fx_image);
658
659 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
660 fx_image->mxcsr = 0x1f80;
661 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
662 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
663}
664EXPORT_SYMBOL_GPL(fx_init);
665
6aa8b732
AK		 666/*
667 * Allocate some memory and give it an address in the guest physical address
668 * space.
669 *
670 * Discontiguous memory is allowed, mostly for framebuffers.
671 */
2c6f5df9
AK		 672static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
673 struct kvm_memory_region *mem)
6aa8b732
AK		 674{
675 int r;
676 gfn_t base_gfn;
677 unsigned long npages;
678 unsigned long i;
679 struct kvm_memory_slot *memslot;
680 struct kvm_memory_slot old, new;
681 int memory_config_version;
682
683 r = -EINVAL;
684 /* General sanity checks */
685 if (mem->memory_size & (PAGE_SIZE - 1))
686 goto out;
687 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
688 goto out;
689 if (mem->slot >= KVM_MEMORY_SLOTS)
690 goto out;
691 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
692 goto out;
693
694 memslot = &kvm->memslots[mem->slot];
695 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
696 npages = mem->memory_size >> PAGE_SHIFT;
697
698 if (!npages)
699 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
700
701raced:
702 spin_lock(&kvm->lock);
703
704 memory_config_version = kvm->memory_config_version;
705 new = old = *memslot;
706
707 new.base_gfn = base_gfn;
708 new.npages = npages;
709 new.flags = mem->flags;
710
711 /* Disallow changing a memory slot's size. */
712 r = -EINVAL;
713 if (npages && old.npages && npages != old.npages)
714 goto out_unlock;
715
716 /* Check for overlaps */
717 r = -EEXIST;
718 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
719 struct kvm_memory_slot *s = &kvm->memslots[i];
720
721 if (s == memslot)
722 continue;
723 if (!((base_gfn + npages <= s->base_gfn) ||
724 (base_gfn >= s->base_gfn + s->npages)))
725 goto out_unlock;
726 }
727 /*
728 * Do memory allocations outside lock. memory_config_version will
729 * detect any races.
730 */
731 spin_unlock(&kvm->lock);
732
733 /* Deallocate if slot is being removed */
734 if (!npages)
8b6d44c7 735 new.phys_mem = NULL;
6aa8b732
AK		 736
737 /* Free page dirty bitmap if unneeded */
738 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
8b6d44c7 739 new.dirty_bitmap = NULL;
6aa8b732
AK		 740
741 r = -ENOMEM;
742
743 /* Allocate if a slot is being created */
744 if (npages && !new.phys_mem) {
745 new.phys_mem = vmalloc(npages * sizeof(struct page *));
746
747 if (!new.phys_mem)
748 goto out_free;
749
750 memset(new.phys_mem, 0, npages * sizeof(struct page *));
751 for (i = 0; i < npages; ++i) {
752 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
753 | __GFP_ZERO);
754 if (!new.phys_mem[i])
755 goto out_free;
5972e953 756 set_page_private(new.phys_mem[i],0);
6aa8b732
AK		 757 }
758 }
759
760 /* Allocate page dirty bitmap if needed */
761 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
762 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
763
764 new.dirty_bitmap = vmalloc(dirty_bytes);
765 if (!new.dirty_bitmap)
766 goto out_free;
767 memset(new.dirty_bitmap, 0, dirty_bytes);
768 }
769
770 spin_lock(&kvm->lock);
771
772 if (memory_config_version != kvm->memory_config_version) {
773 spin_unlock(&kvm->lock);
774 kvm_free_physmem_slot(&new, &old);
775 goto raced;
776 }
777
778 r = -EAGAIN;
779 if (kvm->busy)
780 goto out_unlock;
781
782 if (mem->slot >= kvm->nmemslots)
783 kvm->nmemslots = mem->slot + 1;
784
785 *memslot = new;
786 ++kvm->memory_config_version;
787
90cb0529
AK		 788 kvm_mmu_slot_remove_write_access(kvm, mem->slot);
789 kvm_flush_remote_tlbs(kvm);
6aa8b732 790
90cb0529 791 spin_unlock(&kvm->lock);
6aa8b732
AK		 792
793 kvm_free_physmem_slot(&old, &new);
794 return 0;
795
796out_unlock:
797 spin_unlock(&kvm->lock);
798out_free:
799 kvm_free_physmem_slot(&new, &old);
800out:
801 return r;
802}
803
804/*
805 * Get (and clear) the dirty memory log for a memory slot.
806 */
2c6f5df9
AK		 807static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
808 struct kvm_dirty_log *log)
6aa8b732
AK		 809{
810 struct kvm_memory_slot *memslot;
811 int r, i;
812 int n;
813 unsigned long any = 0;
814
815 spin_lock(&kvm->lock);
816
817 /*
818 * Prevent changes to guest memory configuration even while the lock
819 * is not taken.
820 */
821 ++kvm->busy;
822 spin_unlock(&kvm->lock);
823 r = -EINVAL;
824 if (log->slot >= KVM_MEMORY_SLOTS)
825 goto out;
826
827 memslot = &kvm->memslots[log->slot];
828 r = -ENOENT;
829 if (!memslot->dirty_bitmap)
830 goto out;
831
cd1a4a98 832 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
6aa8b732 833
cd1a4a98 834 for (i = 0; !any && i < n/sizeof(long); ++i)
6aa8b732
AK		 835 any = memslot->dirty_bitmap[i];
836
837 r = -EFAULT;
838 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
839 goto out;
840
90cb0529
AK		 841 spin_lock(&kvm->lock);
842 kvm_mmu_slot_remove_write_access(kvm, log->slot);
843 kvm_flush_remote_tlbs(kvm);
844 memset(memslot->dirty_bitmap, 0, n);
845 spin_unlock(&kvm->lock);
6aa8b732
AK		 846
847 r = 0;
848
849out:
850 spin_lock(&kvm->lock);
851 --kvm->busy;
852 spin_unlock(&kvm->lock);
853 return r;
854}
855
e8207547
AK		 856/*
857 * Set a new alias region. Aliases map a portion of physical memory into
858 * another portion. This is useful for memory windows, for example the PC
859 * VGA region.
860 */
861static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
862 struct kvm_memory_alias *alias)
863{
864 int r, n;
865 struct kvm_mem_alias *p;
866
867 r = -EINVAL;
868 /* General sanity checks */
869 if (alias->memory_size & (PAGE_SIZE - 1))
870 goto out;
871 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
872 goto out;
873 if (alias->slot >= KVM_ALIAS_SLOTS)
874 goto out;
875 if (alias->guest_phys_addr + alias->memory_size
876 < alias->guest_phys_addr)
877 goto out;
878 if (alias->target_phys_addr + alias->memory_size
879 < alias->target_phys_addr)
880 goto out;
881
882 spin_lock(&kvm->lock);
883
884 p = &kvm->aliases[alias->slot];
885 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
886 p->npages = alias->memory_size >> PAGE_SHIFT;
887 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
888
889 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
890 if (kvm->aliases[n - 1].npages)
891 break;
892 kvm->naliases = n;
893
90cb0529 894 kvm_mmu_zap_all(kvm);
e8207547 895
e8207547 896 spin_unlock(&kvm->lock);
e8207547
AK		 897
898 return 0;
899
900out:
901 return r;
902}
903
904static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
905{
906 int i;
907 struct kvm_mem_alias *alias;
908
909 for (i = 0; i < kvm->naliases; ++i) {
910 alias = &kvm->aliases[i];
911 if (gfn >= alias->base_gfn
912 && gfn < alias->base_gfn + alias->npages)
913 return alias->target_gfn + gfn - alias->base_gfn;
914 }
915 return gfn;
916}
917
918static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
6aa8b732
AK		 919{
920 int i;
921
922 for (i = 0; i < kvm->nmemslots; ++i) {
923 struct kvm_memory_slot *memslot = &kvm->memslots[i];
924
925 if (gfn >= memslot->base_gfn
926 && gfn < memslot->base_gfn + memslot->npages)
927 return memslot;
928 }
8b6d44c7 929 return NULL;
6aa8b732 930}
e8207547
AK		 931
932struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
933{
934 gfn = unalias_gfn(kvm, gfn);
935 return __gfn_to_memslot(kvm, gfn);
936}
6aa8b732 937
954bbbc2
AK		 938struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
939{
940 struct kvm_memory_slot *slot;
941
e8207547
AK		 942 gfn = unalias_gfn(kvm, gfn);
943 slot = __gfn_to_memslot(kvm, gfn);
954bbbc2
AK		 944 if (!slot)
945 return NULL;
946 return slot->phys_mem[gfn - slot->base_gfn];
947}
948EXPORT_SYMBOL_GPL(gfn_to_page);
949
6aa8b732
AK		 950void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
951{
952 int i;
31389947 953 struct kvm_memory_slot *memslot;
6aa8b732
AK		 954 unsigned long rel_gfn;
955
956 for (i = 0; i < kvm->nmemslots; ++i) {
957 memslot = &kvm->memslots[i];
958
959 if (gfn >= memslot->base_gfn
960 && gfn < memslot->base_gfn + memslot->npages) {
961
31389947 962 if (!memslot->dirty_bitmap)
6aa8b732
AK		 963 return;
964
965 rel_gfn = gfn - memslot->base_gfn;
966
967 /* avoid RMW */
968 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
969 set_bit(rel_gfn, memslot->dirty_bitmap);
970 return;
971 }
972 }
973}
974
975static int emulator_read_std(unsigned long addr,
4c690a1e 976 void *val,
6aa8b732
AK		 977 unsigned int bytes,
978 struct x86_emulate_ctxt *ctxt)
979{
980 struct kvm_vcpu *vcpu = ctxt->vcpu;
981 void *data = val;
982
983 while (bytes) {
984 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
985 unsigned offset = addr & (PAGE_SIZE-1);
986 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
987 unsigned long pfn;
954bbbc2
AK		 988 struct page *page;
989 void *page_virt;
6aa8b732
AK		 990
991 if (gpa == UNMAPPED_GVA)
992 return X86EMUL_PROPAGATE_FAULT;
993 pfn = gpa >> PAGE_SHIFT;
954bbbc2
AK		 994 page = gfn_to_page(vcpu->kvm, pfn);
995 if (!page)
6aa8b732 996 return X86EMUL_UNHANDLEABLE;
954bbbc2 997 page_virt = kmap_atomic(page, KM_USER0);
6aa8b732 998
954bbbc2 999 memcpy(data, page_virt + offset, tocopy);
6aa8b732 1000
954bbbc2 1001 kunmap_atomic(page_virt, KM_USER0);
6aa8b732
AK		 1002
1003 bytes -= tocopy;
1004 data += tocopy;
1005 addr += tocopy;
1006 }
1007
1008 return X86EMUL_CONTINUE;
1009}
1010
1011static int emulator_write_std(unsigned long addr,
4c690a1e 1012 const void *val,
6aa8b732
AK		 1013 unsigned int bytes,
1014 struct x86_emulate_ctxt *ctxt)
1015{
1016 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
1017 addr, bytes);
1018 return X86EMUL_UNHANDLEABLE;
1019}
1020
2eeb2e94
GH		 1021static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1022 gpa_t addr)
1023{
1024 /*
1025 * Note that its important to have this wrapper function because
1026 * in the very near future we will be checking for MMIOs against
1027 * the LAPIC as well as the general MMIO bus
1028 */
1029 return kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1030}
1031
74906345
ED		 1032static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
1033 gpa_t addr)
1034{
1035 return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
1036}
1037
6aa8b732 1038static int emulator_read_emulated(unsigned long addr,
4c690a1e 1039 void *val,
6aa8b732
AK		 1040 unsigned int bytes,
1041 struct x86_emulate_ctxt *ctxt)
1042{
2eeb2e94
GH		 1043 struct kvm_vcpu *vcpu = ctxt->vcpu;
1044 struct kvm_io_device *mmio_dev;
1045 gpa_t gpa;
6aa8b732
AK		 1046
1047 if (vcpu->mmio_read_completed) {
1048 memcpy(val, vcpu->mmio_data, bytes);
1049 vcpu->mmio_read_completed = 0;
1050 return X86EMUL_CONTINUE;
1051 } else if (emulator_read_std(addr, val, bytes, ctxt)
1052 == X86EMUL_CONTINUE)
1053 return X86EMUL_CONTINUE;
d27d4aca 1054
2eeb2e94
GH		 1055 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1056 if (gpa == UNMAPPED_GVA)
1057 return X86EMUL_PROPAGATE_FAULT;
6aa8b732 1058
2eeb2e94
GH		 1059 /*
1060 * Is this MMIO handled locally?
1061 */
1062 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1063 if (mmio_dev) {
1064 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1065 return X86EMUL_CONTINUE;
6aa8b732 1066 }
2eeb2e94
GH		 1067
1068 vcpu->mmio_needed = 1;
1069 vcpu->mmio_phys_addr = gpa;
1070 vcpu->mmio_size = bytes;
1071 vcpu->mmio_is_write = 0;
1072
1073 return X86EMUL_UNHANDLEABLE;
6aa8b732
AK		 1074}
1075
da4a00f0 1076static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
4c690a1e 1077 const void *val, int bytes)
da4a00f0 1078{
da4a00f0
AK		 1079 struct page *page;
1080 void *virt;
1081
1082 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
1083 return 0;
954bbbc2
AK		 1084 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1085 if (!page)
da4a00f0 1086 return 0;
ab51a434 1087 mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
da4a00f0 1088 virt = kmap_atomic(page, KM_USER0);
fe551881 1089 kvm_mmu_pte_write(vcpu, gpa, val, bytes);
7cfa4b0a 1090 memcpy(virt + offset_in_page(gpa), val, bytes);
da4a00f0 1091 kunmap_atomic(virt, KM_USER0);
da4a00f0
AK		 1092 return 1;
1093}
1094
b0fcd903
AK		 1095static int emulator_write_emulated_onepage(unsigned long addr,
1096 const void *val,
1097 unsigned int bytes,
1098 struct x86_emulate_ctxt *ctxt)
6aa8b732 1099{
2eeb2e94
GH		 1100 struct kvm_vcpu *vcpu = ctxt->vcpu;
1101 struct kvm_io_device *mmio_dev;
1102 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
6aa8b732 1103
c9047f53
AK		 1104 if (gpa == UNMAPPED_GVA) {
1105 kvm_arch_ops->inject_page_fault(vcpu, addr, 2);
6aa8b732 1106 return X86EMUL_PROPAGATE_FAULT;
c9047f53 1107 }
6aa8b732 1108
da4a00f0
AK		 1109 if (emulator_write_phys(vcpu, gpa, val, bytes))
1110 return X86EMUL_CONTINUE;
1111
2eeb2e94
GH		 1112 /*
1113 * Is this MMIO handled locally?
1114 */
1115 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1116 if (mmio_dev) {
1117 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1118 return X86EMUL_CONTINUE;
1119 }
1120
6aa8b732
AK		 1121 vcpu->mmio_needed = 1;
1122 vcpu->mmio_phys_addr = gpa;
1123 vcpu->mmio_size = bytes;
1124 vcpu->mmio_is_write = 1;
4c690a1e 1125 memcpy(vcpu->mmio_data, val, bytes);
6aa8b732
AK		 1126
1127 return X86EMUL_CONTINUE;
1128}
1129
b0fcd903
AK		 1130static int emulator_write_emulated(unsigned long addr,
1131 const void *val,
1132 unsigned int bytes,
1133 struct x86_emulate_ctxt *ctxt)
1134{
1135 /* Crossing a page boundary? */
1136 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1137 int rc, now;
1138
1139 now = -addr & ~PAGE_MASK;
1140 rc = emulator_write_emulated_onepage(addr, val, now, ctxt);
1141 if (rc != X86EMUL_CONTINUE)
1142 return rc;
1143 addr += now;
1144 val += now;
1145 bytes -= now;
1146 }
1147 return emulator_write_emulated_onepage(addr, val, bytes, ctxt);
1148}
1149
6aa8b732 1150static int emulator_cmpxchg_emulated(unsigned long addr,
4c690a1e
AK		 1151 const void *old,
1152 const void *new,
6aa8b732
AK		 1153 unsigned int bytes,
1154 struct x86_emulate_ctxt *ctxt)
1155{
1156 static int reported;
1157
1158 if (!reported) {
1159 reported = 1;
1160 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1161 }
1162 return emulator_write_emulated(addr, new, bytes, ctxt);
1163}
1164
1165static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1166{
1167 return kvm_arch_ops->get_segment_base(vcpu, seg);
1168}
1169
1170int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1171{
6aa8b732
AK		 1172 return X86EMUL_CONTINUE;
1173}
1174
1175int emulate_clts(struct kvm_vcpu *vcpu)
1176{
399badf3 1177 unsigned long cr0;
6aa8b732 1178
707d92fa 1179 cr0 = vcpu->cr0 & ~X86_CR0_TS;
6aa8b732
AK		 1180 kvm_arch_ops->set_cr0(vcpu, cr0);
1181 return X86EMUL_CONTINUE;
1182}
1183
1184int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1185{
1186 struct kvm_vcpu *vcpu = ctxt->vcpu;
1187
1188 switch (dr) {
1189 case 0 ... 3:
1190 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1191 return X86EMUL_CONTINUE;
1192 default:
1193 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1194 __FUNCTION__, dr);
1195 return X86EMUL_UNHANDLEABLE;
1196 }
1197}
1198
1199int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1200{
1201 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1202 int exception;
1203
1204 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1205 if (exception) {
1206 /* FIXME: better handling */
1207 return X86EMUL_UNHANDLEABLE;
1208 }
1209 return X86EMUL_CONTINUE;
1210}
1211
1212static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1213{
1214 static int reported;
1215 u8 opcodes[4];
1216 unsigned long rip = ctxt->vcpu->rip;
1217 unsigned long rip_linear;
1218
1219 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1220
1221 if (reported)
1222 return;
1223
1224 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1225
1226 printk(KERN_ERR "emulation failed but !mmio_needed?"
1227 " rip %lx %02x %02x %02x %02x\n",
1228 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1229 reported = 1;
1230}
1231
1232struct x86_emulate_ops emulate_ops = {
1233 .read_std = emulator_read_std,
1234 .write_std = emulator_write_std,
1235 .read_emulated = emulator_read_emulated,
1236 .write_emulated = emulator_write_emulated,
1237 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1238};
1239
1240int emulate_instruction(struct kvm_vcpu *vcpu,
1241 struct kvm_run *run,
1242 unsigned long cr2,
1243 u16 error_code)
1244{
1245 struct x86_emulate_ctxt emulate_ctxt;
1246 int r;
1247 int cs_db, cs_l;
1248
e7df56e4 1249 vcpu->mmio_fault_cr2 = cr2;
6aa8b732
AK		 1250 kvm_arch_ops->cache_regs(vcpu);
1251
1252 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1253
1254 emulate_ctxt.vcpu = vcpu;
1255 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1256 emulate_ctxt.cr2 = cr2;
1257 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1258 ? X86EMUL_MODE_REAL : cs_l
1259 ? X86EMUL_MODE_PROT64 : cs_db
1260 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1261
1262 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1263 emulate_ctxt.cs_base = 0;
1264 emulate_ctxt.ds_base = 0;
1265 emulate_ctxt.es_base = 0;
1266 emulate_ctxt.ss_base = 0;
1267 } else {
1268 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1269 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1270 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1271 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1272 }
1273
1274 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1275 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1276
1277 vcpu->mmio_is_write = 0;
1278 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1279
1280 if ((r || vcpu->mmio_is_write) && run) {
8fc0d085 1281 run->exit_reason = KVM_EXIT_MMIO;
6aa8b732
AK		 1282 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1283 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1284 run->mmio.len = vcpu->mmio_size;
1285 run->mmio.is_write = vcpu->mmio_is_write;
1286 }
1287
1288 if (r) {
a436036b
AK		 1289 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1290 return EMULATE_DONE;
6aa8b732
AK		 1291 if (!vcpu->mmio_needed) {
1292 report_emulation_failure(&emulate_ctxt);
1293 return EMULATE_FAIL;
1294 }
1295 return EMULATE_DO_MMIO;
1296 }
1297
1298 kvm_arch_ops->decache_regs(vcpu);
1299 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1300
02c83209
AK		 1301 if (vcpu->mmio_is_write) {
1302 vcpu->mmio_needed = 0;
6aa8b732 1303 return EMULATE_DO_MMIO;
02c83209 1304 }
6aa8b732
AK		 1305
1306 return EMULATE_DONE;
1307}
1308EXPORT_SYMBOL_GPL(emulate_instruction);
1309
d3bef15f
AK		 1310int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1311{
1312 if (vcpu->irq_summary)
1313 return 1;
1314
1315 vcpu->run->exit_reason = KVM_EXIT_HLT;
1316 ++vcpu->stat.halt_exits;
1317 return 0;
1318}
1319EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1320
270fd9b9
AK		 1321int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1322{
1323 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1324
9b22bf57 1325 kvm_arch_ops->cache_regs(vcpu);
270fd9b9
AK		 1326 ret = -KVM_EINVAL;
1327#ifdef CONFIG_X86_64
1328 if (is_long_mode(vcpu)) {
1329 nr = vcpu->regs[VCPU_REGS_RAX];
1330 a0 = vcpu->regs[VCPU_REGS_RDI];
1331 a1 = vcpu->regs[VCPU_REGS_RSI];
1332 a2 = vcpu->regs[VCPU_REGS_RDX];
1333 a3 = vcpu->regs[VCPU_REGS_RCX];
1334 a4 = vcpu->regs[VCPU_REGS_R8];
1335 a5 = vcpu->regs[VCPU_REGS_R9];
1336 } else
1337#endif
1338 {
1339 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1340 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1341 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1342 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1343 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1344 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1345 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1346 }
1347 switch (nr) {
1348 default:
b4e63f56
AK		 1349 run->hypercall.args[0] = a0;
1350 run->hypercall.args[1] = a1;
1351 run->hypercall.args[2] = a2;
1352 run->hypercall.args[3] = a3;
1353 run->hypercall.args[4] = a4;
1354 run->hypercall.args[5] = a5;
1355 run->hypercall.ret = ret;
1356 run->hypercall.longmode = is_long_mode(vcpu);
1357 kvm_arch_ops->decache_regs(vcpu);
1358 return 0;
270fd9b9
AK		 1359 }
1360 vcpu->regs[VCPU_REGS_RAX] = ret;
9b22bf57 1361 kvm_arch_ops->decache_regs(vcpu);
270fd9b9
AK		 1362 return 1;
1363}
1364EXPORT_SYMBOL_GPL(kvm_hypercall);
1365
6aa8b732
AK		 1366static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1367{
1368 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1369}
1370
1371void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1372{
1373 struct descriptor_table dt = { limit, base };
1374
1375 kvm_arch_ops->set_gdt(vcpu, &dt);
1376}
1377
1378void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1379{
1380 struct descriptor_table dt = { limit, base };
1381
1382 kvm_arch_ops->set_idt(vcpu, &dt);
1383}
1384
1385void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1386 unsigned long *rflags)
1387{
1388 lmsw(vcpu, msw);
1389 *rflags = kvm_arch_ops->get_rflags(vcpu);
1390}
1391
1392unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1393{
25c4c276 1394 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 1395 switch (cr) {
1396 case 0:
1397 return vcpu->cr0;
1398 case 2:
1399 return vcpu->cr2;
1400 case 3:
1401 return vcpu->cr3;
1402 case 4:
1403 return vcpu->cr4;
1404 default:
1405 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1406 return 0;
1407 }
1408}
1409
1410void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1411 unsigned long *rflags)
1412{
1413 switch (cr) {
1414 case 0:
1415 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1416 *rflags = kvm_arch_ops->get_rflags(vcpu);
1417 break;
1418 case 2:
1419 vcpu->cr2 = val;
1420 break;
1421 case 3:
1422 set_cr3(vcpu, val);
1423 break;
1424 case 4:
1425 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1426 break;
1427 default:
1428 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1429 }
1430}
1431
102d8325
IM		 1432/*
1433 * Register the para guest with the host:
1434 */
1435static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1436{
1437 struct kvm_vcpu_para_state *para_state;
1438 hpa_t para_state_hpa, hypercall_hpa;
1439 struct page *para_state_page;
1440 unsigned char *hypercall;
1441 gpa_t hypercall_gpa;
1442
1443 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1444 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1445
1446 /*
1447 * Needs to be page aligned:
1448 */
1449 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1450 goto err_gp;
1451
1452 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1453 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1454 if (is_error_hpa(para_state_hpa))
1455 goto err_gp;
1456
ab51a434 1457 mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
102d8325 1458 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
fe551881 1459 para_state = kmap(para_state_page);
102d8325
IM		 1460
1461 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1462 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1463
1464 para_state->host_version = KVM_PARA_API_VERSION;
1465 /*
1466 * We cannot support guests that try to register themselves
1467 * with a newer API version than the host supports:
1468 */
1469 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1470 para_state->ret = -KVM_EINVAL;
1471 goto err_kunmap_skip;
1472 }
1473
1474 hypercall_gpa = para_state->hypercall_gpa;
1475 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1476 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1477 if (is_error_hpa(hypercall_hpa)) {
1478 para_state->ret = -KVM_EINVAL;
1479 goto err_kunmap_skip;
1480 }
1481
1482 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1483 vcpu->para_state_page = para_state_page;
1484 vcpu->para_state_gpa = para_state_gpa;
1485 vcpu->hypercall_gpa = hypercall_gpa;
1486
ab51a434 1487 mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
102d8325
IM		 1488 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1489 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1490 kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1491 kunmap_atomic(hypercall, KM_USER1);
1492
1493 para_state->ret = 0;
1494err_kunmap_skip:
fe551881 1495 kunmap(para_state_page);
102d8325
IM		 1496 return 0;
1497err_gp:
1498 return 1;
1499}
1500
3bab1f5d
AK		 1501int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1502{
1503 u64 data;
1504
1505 switch (msr) {
1506 case 0xc0010010: /* SYSCFG */
1507 case 0xc0010015: /* HWCR */
1508 case MSR_IA32_PLATFORM_ID:
1509 case MSR_IA32_P5_MC_ADDR:
1510 case MSR_IA32_P5_MC_TYPE:
1511 case MSR_IA32_MC0_CTL:
1512 case MSR_IA32_MCG_STATUS:
1513 case MSR_IA32_MCG_CAP:
1514 case MSR_IA32_MC0_MISC:
1515 case MSR_IA32_MC0_MISC+4:
1516 case MSR_IA32_MC0_MISC+8:
1517 case MSR_IA32_MC0_MISC+12:
1518 case MSR_IA32_MC0_MISC+16:
1519 case MSR_IA32_UCODE_REV:
a8d13ea2 1520 case MSR_IA32_PERF_STATUS:
2dc7094b 1521 case MSR_IA32_EBL_CR_POWERON:
3bab1f5d
AK		 1522 /* MTRR registers */
1523 case 0xfe:
1524 case 0x200 ... 0x2ff:
1525 data = 0;
1526 break;
a8d13ea2
AK		 1527 case 0xcd: /* fsb frequency */
1528 data = 3;
1529 break;
3bab1f5d
AK		 1530 case MSR_IA32_APICBASE:
1531 data = vcpu->apic_base;
1532 break;
6f00e68f
AK		 1533 case MSR_IA32_MISC_ENABLE:
1534 data = vcpu->ia32_misc_enable_msr;
1535 break;
3bab1f5d
AK		 1536#ifdef CONFIG_X86_64
1537 case MSR_EFER:
1538 data = vcpu->shadow_efer;
1539 break;
1540#endif
1541 default:
1542 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1543 return 1;
1544 }
1545 *pdata = data;
1546 return 0;
1547}
1548EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1549
6aa8b732
AK		 1550/*
1551 * Reads an msr value (of 'msr_index') into 'pdata'.
1552 * Returns 0 on success, non-0 otherwise.
1553 * Assumes vcpu_load() was already called.
1554 */
35f3f286 1555int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
6aa8b732
AK		 1556{
1557 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1558}
1559
05b3e0c2 1560#ifdef CONFIG_X86_64
6aa8b732 1561
3bab1f5d 1562static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1563{
6aa8b732
AK		 1564 if (efer & EFER_RESERVED_BITS) {
1565 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1566 efer);
1567 inject_gp(vcpu);
1568 return;
1569 }
1570
1571 if (is_paging(vcpu)
1572 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1573 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1574 inject_gp(vcpu);
1575 return;
1576 }
1577
7725f0ba
AK		 1578 kvm_arch_ops->set_efer(vcpu, efer);
1579
6aa8b732
AK		 1580 efer &= ~EFER_LMA;
1581 efer |= vcpu->shadow_efer & EFER_LMA;
1582
1583 vcpu->shadow_efer = efer;
6aa8b732 1584}
6aa8b732
AK		 1585
1586#endif
1587
3bab1f5d
AK		 1588int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1589{
1590 switch (msr) {
1591#ifdef CONFIG_X86_64
1592 case MSR_EFER:
1593 set_efer(vcpu, data);
1594 break;
1595#endif
1596 case MSR_IA32_MC0_STATUS:
1597 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1598 __FUNCTION__, data);
1599 break;
0e5bf0d0
SK		 1600 case MSR_IA32_MCG_STATUS:
1601 printk(KERN_WARNING "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
1602 __FUNCTION__, data);
1603 break;
3bab1f5d
AK		 1604 case MSR_IA32_UCODE_REV:
1605 case MSR_IA32_UCODE_WRITE:
1606 case 0x200 ... 0x2ff: /* MTRRs */
1607 break;
1608 case MSR_IA32_APICBASE:
1609 vcpu->apic_base = data;
1610 break;
6f00e68f
AK		 1611 case MSR_IA32_MISC_ENABLE:
1612 vcpu->ia32_misc_enable_msr = data;
1613 break;
102d8325
IM		 1614 /*
1615 * This is the 'probe whether the host is KVM' logic:
1616 */
1617 case MSR_KVM_API_MAGIC:
1618 return vcpu_register_para(vcpu, data);
1619
3bab1f5d
AK		 1620 default:
1621 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1622 return 1;
1623 }
1624 return 0;
1625}
1626EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1627
6aa8b732
AK		 1628/*
1629 * Writes msr value into into the appropriate "register".
1630 * Returns 0 on success, non-0 otherwise.
1631 * Assumes vcpu_load() was already called.
1632 */
35f3f286 1633int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
6aa8b732
AK		 1634{
1635 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1636}
1637
1638void kvm_resched(struct kvm_vcpu *vcpu)
1639{
3fca0365
YD		 1640 if (!need_resched())
1641 return;
6aa8b732
AK		 1642 vcpu_put(vcpu);
1643 cond_resched();
bccf2150 1644 vcpu_load(vcpu);
6aa8b732
AK		 1645}
1646EXPORT_SYMBOL_GPL(kvm_resched);
1647
06465c5a
AK		 1648void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1649{
1650 int i;
1651 u32 function;
1652 struct kvm_cpuid_entry *e, *best;
1653
1654 kvm_arch_ops->cache_regs(vcpu);
1655 function = vcpu->regs[VCPU_REGS_RAX];
1656 vcpu->regs[VCPU_REGS_RAX] = 0;
1657 vcpu->regs[VCPU_REGS_RBX] = 0;
1658 vcpu->regs[VCPU_REGS_RCX] = 0;
1659 vcpu->regs[VCPU_REGS_RDX] = 0;
1660 best = NULL;
1661 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1662 e = &vcpu->cpuid_entries[i];
1663 if (e->function == function) {
1664 best = e;
1665 break;
1666 }
1667 /*
1668 * Both basic or both extended?
1669 */
1670 if (((e->function ^ function) & 0x80000000) == 0)
1671 if (!best || e->function > best->function)
1672 best = e;
1673 }
1674 if (best) {
1675 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1676 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1677 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1678 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1679 }
1680 kvm_arch_ops->decache_regs(vcpu);
1681 kvm_arch_ops->skip_emulated_instruction(vcpu);
1682}
1683EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1684
039576c0 1685static int pio_copy_data(struct kvm_vcpu *vcpu)
46fc1477 1686{
039576c0
AK		 1687 void *p = vcpu->pio_data;
1688 void *q;
1689 unsigned bytes;
1690 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1691
1692 kvm_arch_ops->vcpu_put(vcpu);
1693 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1694 PAGE_KERNEL);
1695 if (!q) {
1696 kvm_arch_ops->vcpu_load(vcpu);
1697 free_pio_guest_pages(vcpu);
1698 return -ENOMEM;
1699 }
1700 q += vcpu->pio.guest_page_offset;
1701 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1702 if (vcpu->pio.in)
1703 memcpy(q, p, bytes);
1704 else
1705 memcpy(p, q, bytes);
1706 q -= vcpu->pio.guest_page_offset;
1707 vunmap(q);
1708 kvm_arch_ops->vcpu_load(vcpu);
1709 free_pio_guest_pages(vcpu);
1710 return 0;
1711}
1712
1713static int complete_pio(struct kvm_vcpu *vcpu)
1714{
1715 struct kvm_pio_request *io = &vcpu->pio;
46fc1477 1716 long delta;
039576c0 1717 int r;
46fc1477
AK		 1718
1719 kvm_arch_ops->cache_regs(vcpu);
1720
1721 if (!io->string) {
039576c0
AK		 1722 if (io->in)
1723 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
46fc1477
AK		 1724 io->size);
1725 } else {
039576c0
AK		 1726 if (io->in) {
1727 r = pio_copy_data(vcpu);
1728 if (r) {
1729 kvm_arch_ops->cache_regs(vcpu);
1730 return r;
1731 }
1732 }
1733
46fc1477
AK		 1734 delta = 1;
1735 if (io->rep) {
039576c0 1736 delta *= io->cur_count;
46fc1477
AK		 1737 /*
1738 * The size of the register should really depend on
1739 * current address size.
1740 */
1741 vcpu->regs[VCPU_REGS_RCX] -= delta;
1742 }
039576c0 1743 if (io->down)
46fc1477
AK		 1744 delta = -delta;
1745 delta *= io->size;
039576c0 1746 if (io->in)
46fc1477
AK		 1747 vcpu->regs[VCPU_REGS_RDI] += delta;
1748 else
1749 vcpu->regs[VCPU_REGS_RSI] += delta;
1750 }
1751
46fc1477
AK		 1752 kvm_arch_ops->decache_regs(vcpu);
1753
039576c0
AK		 1754 io->count -= io->cur_count;
1755 io->cur_count = 0;
1756
1757 if (!io->count)
1758 kvm_arch_ops->skip_emulated_instruction(vcpu);
1759 return 0;
46fc1477
AK		 1760}
1761
65619eb5
ED		 1762static void kernel_pio(struct kvm_io_device *pio_dev,
1763 struct kvm_vcpu *vcpu,
1764 void *pd)
74906345
ED		 1765{
1766 /* TODO: String I/O for in kernel device */
1767
1768 if (vcpu->pio.in)
1769 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1770 vcpu->pio.size,
65619eb5 1771 pd);
74906345
ED		 1772 else
1773 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1774 vcpu->pio.size,
65619eb5
ED		 1775 pd);
1776}
1777
1778static void pio_string_write(struct kvm_io_device *pio_dev,
1779 struct kvm_vcpu *vcpu)
1780{
1781 struct kvm_pio_request *io = &vcpu->pio;
1782 void *pd = vcpu->pio_data;
1783 int i;
1784
1785 for (i = 0; i < io->cur_count; i++) {
1786 kvm_iodevice_write(pio_dev, io->port,
1787 io->size,
1788 pd);
1789 pd += io->size;
1790 }
74906345
ED		 1791}
1792
039576c0
AK		 1793int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1794 int size, unsigned long count, int string, int down,
1795 gva_t address, int rep, unsigned port)
1796{
1797 unsigned now, in_page;
65619eb5 1798 int i, ret = 0;
039576c0
AK		 1799 int nr_pages = 1;
1800 struct page *page;
74906345 1801 struct kvm_io_device *pio_dev;
039576c0
AK		 1802
1803 vcpu->run->exit_reason = KVM_EXIT_IO;
1804 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1805 vcpu->run->io.size = size;
1806 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1807 vcpu->run->io.count = count;
1808 vcpu->run->io.port = port;
1809 vcpu->pio.count = count;
1810 vcpu->pio.cur_count = count;
1811 vcpu->pio.size = size;
1812 vcpu->pio.in = in;
74906345 1813 vcpu->pio.port = port;
039576c0
AK		 1814 vcpu->pio.string = string;
1815 vcpu->pio.down = down;
1816 vcpu->pio.guest_page_offset = offset_in_page(address);
1817 vcpu->pio.rep = rep;
1818
74906345 1819 pio_dev = vcpu_find_pio_dev(vcpu, port);
039576c0
AK		 1820 if (!string) {
1821 kvm_arch_ops->cache_regs(vcpu);
1822 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1823 kvm_arch_ops->decache_regs(vcpu);
74906345 1824 if (pio_dev) {
65619eb5 1825 kernel_pio(pio_dev, vcpu, vcpu->pio_data);
74906345
ED		 1826 complete_pio(vcpu);
1827 return 1;
1828 }
039576c0
AK		 1829 return 0;
1830 }
1831
1832 if (!count) {
1833 kvm_arch_ops->skip_emulated_instruction(vcpu);
1834 return 1;
1835 }
1836
1837 now = min(count, PAGE_SIZE / size);
1838
1839 if (!down)
1840 in_page = PAGE_SIZE - offset_in_page(address);
1841 else
1842 in_page = offset_in_page(address) + size;
1843 now = min(count, (unsigned long)in_page / size);
1844 if (!now) {
1845 /*
1846 * String I/O straddles page boundary. Pin two guest pages
1847 * so that we satisfy atomicity constraints. Do just one
1848 * transaction to avoid complexity.
1849 */
1850 nr_pages = 2;
1851 now = 1;
1852 }
1853 if (down) {
1854 /*
1855 * String I/O in reverse. Yuck. Kill the guest, fix later.
1856 */
1857 printk(KERN_ERR "kvm: guest string pio down\n");
1858 inject_gp(vcpu);
1859 return 1;
1860 }
1861 vcpu->run->io.count = now;
1862 vcpu->pio.cur_count = now;
1863
1864 for (i = 0; i < nr_pages; ++i) {
1865 spin_lock(&vcpu->kvm->lock);
1866 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1867 if (page)
1868 get_page(page);
1869 vcpu->pio.guest_pages[i] = page;
1870 spin_unlock(&vcpu->kvm->lock);
1871 if (!page) {
1872 inject_gp(vcpu);
1873 free_pio_guest_pages(vcpu);
1874 return 1;
1875 }
1876 }
1877
65619eb5
ED		 1878 if (!vcpu->pio.in) {
1879 /* string PIO write */
1880 ret = pio_copy_data(vcpu);
1881 if (ret >= 0 && pio_dev) {
1882 pio_string_write(pio_dev, vcpu);
1883 complete_pio(vcpu);
1884 if (vcpu->pio.count == 0)
1885 ret = 1;
1886 }
1887 } else if (pio_dev)
1888 printk(KERN_ERR "no string pio read support yet, "
1889 "port %x size %d count %ld\n",
1890 port, size, count);
1891
1892 return ret;
039576c0
AK		 1893}
1894EXPORT_SYMBOL_GPL(kvm_setup_pio);
1895
bccf2150 1896static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
6aa8b732 1897{
6aa8b732 1898 int r;
1961d276 1899 sigset_t sigsaved;
6aa8b732 1900
bccf2150 1901 vcpu_load(vcpu);
6aa8b732 1902
1961d276
AK		 1903 if (vcpu->sigset_active)
1904 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
1905
54810342
DL		 1906 /* re-sync apic's tpr */
1907 vcpu->cr8 = kvm_run->cr8;
1908
02c83209
AK		 1909 if (vcpu->pio.cur_count) {
1910 r = complete_pio(vcpu);
1911 if (r)
1912 goto out;
1913 }
1914
1915 if (vcpu->mmio_needed) {
1916 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1917 vcpu->mmio_read_completed = 1;
1918 vcpu->mmio_needed = 0;
1919 r = emulate_instruction(vcpu, kvm_run,
1920 vcpu->mmio_fault_cr2, 0);
1921 if (r == EMULATE_DO_MMIO) {
1922 /*
1923 * Read-modify-write. Back to userspace.
1924 */
02c83209
AK		 1925 r = 0;
1926 goto out;
46fc1477 1927 }
6aa8b732
AK		 1928 }
1929
8eb7d334 1930 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
b4e63f56
AK		 1931 kvm_arch_ops->cache_regs(vcpu);
1932 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
1933 kvm_arch_ops->decache_regs(vcpu);
1934 }
1935
6aa8b732
AK		 1936 r = kvm_arch_ops->run(vcpu, kvm_run);
1937
039576c0 1938out:
1961d276
AK		 1939 if (vcpu->sigset_active)
1940 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1941
6aa8b732
AK		 1942 vcpu_put(vcpu);
1943 return r;
1944}
1945
bccf2150
AK		 1946static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
1947 struct kvm_regs *regs)
6aa8b732 1948{
bccf2150 1949 vcpu_load(vcpu);
6aa8b732
AK		 1950
1951 kvm_arch_ops->cache_regs(vcpu);
1952
1953 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1954 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1955 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1956 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1957 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1958 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1959 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1960 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1961#ifdef CONFIG_X86_64
6aa8b732
AK		 1962 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1963 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1964 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1965 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1966 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1967 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1968 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1969 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1970#endif
1971
1972 regs->rip = vcpu->rip;
1973 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1974
1975 /*
1976 * Don't leak debug flags in case they were set for guest debugging
1977 */
1978 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1979 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1980
1981 vcpu_put(vcpu);
1982
1983 return 0;
1984}
1985
bccf2150
AK		 1986static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
1987 struct kvm_regs *regs)
6aa8b732 1988{
bccf2150 1989 vcpu_load(vcpu);
6aa8b732
AK		 1990
1991 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1992 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1993 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1994 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1995 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1996 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1997 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1998 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1999#ifdef CONFIG_X86_64
6aa8b732
AK		 2000 vcpu->regs[VCPU_REGS_R8] = regs->r8;
2001 vcpu->regs[VCPU_REGS_R9] = regs->r9;
2002 vcpu->regs[VCPU_REGS_R10] = regs->r10;
2003 vcpu->regs[VCPU_REGS_R11] = regs->r11;
2004 vcpu->regs[VCPU_REGS_R12] = regs->r12;
2005 vcpu->regs[VCPU_REGS_R13] = regs->r13;
2006 vcpu->regs[VCPU_REGS_R14] = regs->r14;
2007 vcpu->regs[VCPU_REGS_R15] = regs->r15;
2008#endif
2009
2010 vcpu->rip = regs->rip;
2011 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
2012
2013 kvm_arch_ops->decache_regs(vcpu);
2014
2015 vcpu_put(vcpu);
2016
2017 return 0;
2018}
2019
2020static void get_segment(struct kvm_vcpu *vcpu,
2021 struct kvm_segment *var, int seg)
2022{
2023 return kvm_arch_ops->get_segment(vcpu, var, seg);
2024}
2025
bccf2150
AK		 2026static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2027 struct kvm_sregs *sregs)
6aa8b732 2028{
6aa8b732
AK		 2029 struct descriptor_table dt;
2030
bccf2150 2031 vcpu_load(vcpu);
6aa8b732
AK		 2032
2033 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2034 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2035 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2036 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2037 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2038 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2039
2040 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2041 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2042
2043 kvm_arch_ops->get_idt(vcpu, &dt);
2044 sregs->idt.limit = dt.limit;
2045 sregs->idt.base = dt.base;
2046 kvm_arch_ops->get_gdt(vcpu, &dt);
2047 sregs->gdt.limit = dt.limit;
2048 sregs->gdt.base = dt.base;
2049
25c4c276 2050 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 2051 sregs->cr0 = vcpu->cr0;
2052 sregs->cr2 = vcpu->cr2;
2053 sregs->cr3 = vcpu->cr3;
2054 sregs->cr4 = vcpu->cr4;
2055 sregs->cr8 = vcpu->cr8;
2056 sregs->efer = vcpu->shadow_efer;
2057 sregs->apic_base = vcpu->apic_base;
2058
2059 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2060 sizeof sregs->interrupt_bitmap);
2061
2062 vcpu_put(vcpu);
2063
2064 return 0;
2065}
2066
2067static void set_segment(struct kvm_vcpu *vcpu,
2068 struct kvm_segment *var, int seg)
2069{
2070 return kvm_arch_ops->set_segment(vcpu, var, seg);
2071}
2072
bccf2150
AK		 2073static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2074 struct kvm_sregs *sregs)
6aa8b732 2075{
6aa8b732
AK		 2076 int mmu_reset_needed = 0;
2077 int i;
2078 struct descriptor_table dt;
2079
bccf2150 2080 vcpu_load(vcpu);
6aa8b732 2081
6aa8b732
AK		 2082 dt.limit = sregs->idt.limit;
2083 dt.base = sregs->idt.base;
2084 kvm_arch_ops->set_idt(vcpu, &dt);
2085 dt.limit = sregs->gdt.limit;
2086 dt.base = sregs->gdt.base;
2087 kvm_arch_ops->set_gdt(vcpu, &dt);
2088
2089 vcpu->cr2 = sregs->cr2;
2090 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2091 vcpu->cr3 = sregs->cr3;
2092
2093 vcpu->cr8 = sregs->cr8;
2094
2095 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 2096#ifdef CONFIG_X86_64
6aa8b732
AK		 2097 kvm_arch_ops->set_efer(vcpu, sregs->efer);
2098#endif
2099 vcpu->apic_base = sregs->apic_base;
2100
25c4c276 2101 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
399badf3 2102
6aa8b732 2103 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
f6528b03 2104 kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
6aa8b732
AK		 2105
2106 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2107 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 2108 if (!is_long_mode(vcpu) && is_pae(vcpu))
2109 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 2110
2111 if (mmu_reset_needed)
2112 kvm_mmu_reset_context(vcpu);
2113
2114 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2115 sizeof vcpu->irq_pending);
2116 vcpu->irq_summary = 0;
9eb829ce 2117 for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i)
6aa8b732
AK		 2118 if (vcpu->irq_pending[i])
2119 __set_bit(i, &vcpu->irq_summary);
2120
024aa1c0
AK		 2121 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2122 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2123 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2124 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2125 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2126 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2127
2128 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2129 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2130
6aa8b732
AK		 2131 vcpu_put(vcpu);
2132
2133 return 0;
2134}
2135
2136/*
2137 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2138 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 2139 *
2140 * This list is modified at module load time to reflect the
2141 * capabilities of the host cpu.
6aa8b732
AK		 2142 */
2143static u32 msrs_to_save[] = {
2144 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2145 MSR_K6_STAR,
05b3e0c2 2146#ifdef CONFIG_X86_64
6aa8b732
AK		 2147 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2148#endif
2149 MSR_IA32_TIME_STAMP_COUNTER,
2150};
2151
bf591b24
MR		 2152static unsigned num_msrs_to_save;
2153
6f00e68f
AK		 2154static u32 emulated_msrs[] = {
2155 MSR_IA32_MISC_ENABLE,
2156};
2157
bf591b24
MR		 2158static __init void kvm_init_msr_list(void)
2159{
2160 u32 dummy[2];
2161 unsigned i, j;
2162
2163 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2164 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2165 continue;
2166 if (j < i)
2167 msrs_to_save[j] = msrs_to_save[i];
2168 j++;
2169 }
2170 num_msrs_to_save = j;
2171}
6aa8b732
AK		 2172
2173/*
2174 * Adapt set_msr() to msr_io()'s calling convention
2175 */
2176static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2177{
35f3f286 2178 return kvm_set_msr(vcpu, index, *data);
6aa8b732
AK		 2179}
2180
2181/*
2182 * Read or write a bunch of msrs. All parameters are kernel addresses.
2183 *
2184 * @return number of msrs set successfully.
2185 */
bccf2150 2186static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
6aa8b732
AK		 2187 struct kvm_msr_entry *entries,
2188 int (*do_msr)(struct kvm_vcpu *vcpu,
2189 unsigned index, u64 *data))
2190{
6aa8b732
AK		 2191 int i;
2192
bccf2150 2193 vcpu_load(vcpu);
6aa8b732
AK		 2194
2195 for (i = 0; i < msrs->nmsrs; ++i)
2196 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2197 break;
2198
2199 vcpu_put(vcpu);
2200
2201 return i;
2202}
2203
2204/*
2205 * Read or write a bunch of msrs. Parameters are user addresses.
2206 *
2207 * @return number of msrs set successfully.
2208 */
bccf2150 2209static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
6aa8b732
AK		 2210 int (*do_msr)(struct kvm_vcpu *vcpu,
2211 unsigned index, u64 *data),
2212 int writeback)
2213{
2214 struct kvm_msrs msrs;
2215 struct kvm_msr_entry *entries;
2216 int r, n;
2217 unsigned size;
2218
2219 r = -EFAULT;
2220 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2221 goto out;
2222
2223 r = -E2BIG;
2224 if (msrs.nmsrs >= MAX_IO_MSRS)
2225 goto out;
2226
2227 r = -ENOMEM;
2228 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2229 entries = vmalloc(size);
2230 if (!entries)
2231 goto out;
2232
2233 r = -EFAULT;
2234 if (copy_from_user(entries, user_msrs->entries, size))
2235 goto out_free;
2236
bccf2150 2237 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
6aa8b732
AK		 2238 if (r < 0)
2239 goto out_free;
2240
2241 r = -EFAULT;
2242 if (writeback && copy_to_user(user_msrs->entries, entries, size))
2243 goto out_free;
2244
2245 r = n;
2246
2247out_free:
2248 vfree(entries);
2249out:
2250 return r;
2251}
2252
2253/*
2254 * Translate a guest virtual address to a guest physical address.
2255 */
bccf2150
AK		 2256static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2257 struct kvm_translation *tr)
6aa8b732
AK		 2258{
2259 unsigned long vaddr = tr->linear_address;
6aa8b732
AK		 2260 gpa_t gpa;
2261
bccf2150
AK		 2262 vcpu_load(vcpu);
2263 spin_lock(&vcpu->kvm->lock);
6aa8b732
AK		 2264 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2265 tr->physical_address = gpa;
2266 tr->valid = gpa != UNMAPPED_GVA;
2267 tr->writeable = 1;
2268 tr->usermode = 0;
bccf2150 2269 spin_unlock(&vcpu->kvm->lock);
6aa8b732
AK		 2270 vcpu_put(vcpu);
2271
2272 return 0;
2273}
2274
bccf2150
AK		 2275static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2276 struct kvm_interrupt *irq)
6aa8b732 2277{
6aa8b732
AK		 2278 if (irq->irq < 0 || irq->irq >= 256)
2279 return -EINVAL;
bccf2150 2280 vcpu_load(vcpu);
6aa8b732
AK		 2281
2282 set_bit(irq->irq, vcpu->irq_pending);
2283 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2284
2285 vcpu_put(vcpu);
2286
2287 return 0;
2288}
2289
bccf2150
AK		 2290static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2291 struct kvm_debug_guest *dbg)
6aa8b732 2292{
6aa8b732
AK		 2293 int r;
2294
bccf2150 2295 vcpu_load(vcpu);
6aa8b732
AK		 2296
2297 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
2298
2299 vcpu_put(vcpu);
2300
2301 return r;
2302}
2303
9a2bb7f4
AK		 2304static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2305 unsigned long address,
2306 int *type)
2307{
2308 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2309 unsigned long pgoff;
2310 struct page *page;
2311
9a2bb7f4 2312 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
039576c0
AK		 2313 if (pgoff == 0)
2314 page = virt_to_page(vcpu->run);
2315 else if (pgoff == KVM_PIO_PAGE_OFFSET)
2316 page = virt_to_page(vcpu->pio_data);
2317 else
9a2bb7f4 2318 return NOPAGE_SIGBUS;
9a2bb7f4 2319 get_page(page);
cd0d9137
NAQ		 2320 if (type != NULL)
2321 *type = VM_FAULT_MINOR;
2322
9a2bb7f4
AK		 2323 return page;
2324}
2325
2326static struct vm_operations_struct kvm_vcpu_vm_ops = {
2327 .nopage = kvm_vcpu_nopage,
2328};
2329
2330static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2331{
2332 vma->vm_ops = &kvm_vcpu_vm_ops;
2333 return 0;
2334}
2335
bccf2150
AK		 2336static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2337{
2338 struct kvm_vcpu *vcpu = filp->private_data;
2339
2340 fput(vcpu->kvm->filp);
2341 return 0;
2342}
2343
2344static struct file_operations kvm_vcpu_fops = {
2345 .release = kvm_vcpu_release,
2346 .unlocked_ioctl = kvm_vcpu_ioctl,
2347 .compat_ioctl = kvm_vcpu_ioctl,
9a2bb7f4 2348 .mmap = kvm_vcpu_mmap,
bccf2150
AK		 2349};
2350
2351/*
2352 * Allocates an inode for the vcpu.
2353 */
2354static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2355{
2356 int fd, r;
2357 struct inode *inode;
2358 struct file *file;
2359
d6d28168
AK		 2360 r = anon_inode_getfd(&fd, &inode, &file,
2361 "kvm-vcpu", &kvm_vcpu_fops, vcpu);
2362 if (r)
2363 return r;
bccf2150 2364 atomic_inc(&vcpu->kvm->filp->f_count);
bccf2150 2365 return fd;
bccf2150
AK		 2366}
2367
c5ea7660
AK		 2368/*
2369 * Creates some virtual cpus. Good luck creating more than one.
2370 */
2371static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2372{
2373 int r;
2374 struct kvm_vcpu *vcpu;
9a2bb7f4 2375 struct page *page;
c5ea7660
AK		 2376
2377 r = -EINVAL;
2378 if (!valid_vcpu(n))
2379 goto out;
2380
2381 vcpu = &kvm->vcpus[n];
dad3795d 2382 vcpu->vcpu_id = n;
c5ea7660
AK		 2383
2384 mutex_lock(&vcpu->mutex);
2385
a2fa3e9f 2386 if (vcpu->valid) {
c5ea7660
AK		 2387 mutex_unlock(&vcpu->mutex);
2388 return -EEXIST;
2389 }
2390
9a2bb7f4
AK		 2391 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2392 r = -ENOMEM;
2393 if (!page)
2394 goto out_unlock;
2395 vcpu->run = page_address(page);
2396
039576c0
AK		 2397 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2398 r = -ENOMEM;
2399 if (!page)
2400 goto out_free_run;
2401 vcpu->pio_data = page_address(page);
2402
c5ea7660
AK		 2403 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
2404 FX_IMAGE_ALIGN);
2405 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
d917a6b9 2406 vcpu->cr0 = 0x10;
c5ea7660
AK		 2407
2408 r = kvm_arch_ops->vcpu_create(vcpu);
2409 if (r < 0)
2410 goto out_free_vcpus;
2411
2412 r = kvm_mmu_create(vcpu);
2413 if (r < 0)
2414 goto out_free_vcpus;
2415
2416 kvm_arch_ops->vcpu_load(vcpu);
2417 r = kvm_mmu_setup(vcpu);
2418 if (r >= 0)
2419 r = kvm_arch_ops->vcpu_setup(vcpu);
2420 vcpu_put(vcpu);
2421
2422 if (r < 0)
2423 goto out_free_vcpus;
2424
bccf2150
AK		 2425 r = create_vcpu_fd(vcpu);
2426 if (r < 0)
2427 goto out_free_vcpus;
2428
39c3b86e
AK		 2429 spin_lock(&kvm_lock);
2430 if (n >= kvm->nvcpus)
2431 kvm->nvcpus = n + 1;
2432 spin_unlock(&kvm_lock);
2433
a2fa3e9f
GH		 2434 vcpu->valid = 1;
2435
bccf2150 2436 return r;
c5ea7660
AK		 2437
2438out_free_vcpus:
2439 kvm_free_vcpu(vcpu);
039576c0
AK		 2440out_free_run:
2441 free_page((unsigned long)vcpu->run);
2442 vcpu->run = NULL;
9a2bb7f4 2443out_unlock:
c5ea7660
AK		 2444 mutex_unlock(&vcpu->mutex);
2445out:
2446 return r;
2447}
2448
2cc51560
ED		 2449static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2450{
2451 u64 efer;
2452 int i;
2453 struct kvm_cpuid_entry *e, *entry;
2454
2455 rdmsrl(MSR_EFER, efer);
2456 entry = NULL;
2457 for (i = 0; i < vcpu->cpuid_nent; ++i) {
2458 e = &vcpu->cpuid_entries[i];
2459 if (e->function == 0x80000001) {
2460 entry = e;
2461 break;
2462 }
2463 }
4c981b43 2464 if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) {
2cc51560 2465 entry->edx &= ~(1 << 20);
4c981b43 2466 printk(KERN_INFO "kvm: guest NX capability removed\n");
2cc51560
ED		 2467 }
2468}
2469
06465c5a
AK		 2470static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2471 struct kvm_cpuid *cpuid,
2472 struct kvm_cpuid_entry __user *entries)
2473{
2474 int r;
2475
2476 r = -E2BIG;
2477 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2478 goto out;
2479 r = -EFAULT;
2480 if (copy_from_user(&vcpu->cpuid_entries, entries,
2481 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2482 goto out;
2483 vcpu->cpuid_nent = cpuid->nent;
2cc51560 2484 cpuid_fix_nx_cap(vcpu);
06465c5a
AK		 2485 return 0;
2486
2487out:
2488 return r;
2489}
2490
1961d276
AK		 2491static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2492{
2493 if (sigset) {
2494 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2495 vcpu->sigset_active = 1;
2496 vcpu->sigset = *sigset;
2497 } else
2498 vcpu->sigset_active = 0;
2499 return 0;
2500}
2501
b8836737
AK		 2502/*
2503 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2504 * we have asm/x86/processor.h
2505 */
2506struct fxsave {
2507 u16 cwd;
2508 u16 swd;
2509 u16 twd;
2510 u16 fop;
2511 u64 rip;
2512 u64 rdp;
2513 u32 mxcsr;
2514 u32 mxcsr_mask;
2515 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2516#ifdef CONFIG_X86_64
2517 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2518#else
2519 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2520#endif
2521};
2522
2523static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2524{
2525 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2526
2527 vcpu_load(vcpu);
2528
2529 memcpy(fpu->fpr, fxsave->st_space, 128);
2530 fpu->fcw = fxsave->cwd;
2531 fpu->fsw = fxsave->swd;
2532 fpu->ftwx = fxsave->twd;
2533 fpu->last_opcode = fxsave->fop;
2534 fpu->last_ip = fxsave->rip;
2535 fpu->last_dp = fxsave->rdp;
2536 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2537
2538 vcpu_put(vcpu);
2539
2540 return 0;
2541}
2542
2543static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2544{
2545 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2546
2547 vcpu_load(vcpu);
2548
2549 memcpy(fxsave->st_space, fpu->fpr, 128);
2550 fxsave->cwd = fpu->fcw;
2551 fxsave->swd = fpu->fsw;
2552 fxsave->twd = fpu->ftwx;
2553 fxsave->fop = fpu->last_opcode;
2554 fxsave->rip = fpu->last_ip;
2555 fxsave->rdp = fpu->last_dp;
2556 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2557
2558 vcpu_put(vcpu);
2559
2560 return 0;
2561}
2562
bccf2150
AK		 2563static long kvm_vcpu_ioctl(struct file *filp,
2564 unsigned int ioctl, unsigned long arg)
6aa8b732 2565{
bccf2150 2566 struct kvm_vcpu *vcpu = filp->private_data;
2f366987 2567 void __user *argp = (void __user *)arg;
6aa8b732
AK		 2568 int r = -EINVAL;
2569
2570 switch (ioctl) {
9a2bb7f4 2571 case KVM_RUN:
f0fe5108
AK		 2572 r = -EINVAL;
2573 if (arg)
2574 goto out;
9a2bb7f4 2575 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
6aa8b732 2576 break;
6aa8b732
AK		 2577 case KVM_GET_REGS: {
2578 struct kvm_regs kvm_regs;
2579
bccf2150
AK		 2580 memset(&kvm_regs, 0, sizeof kvm_regs);
2581 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2582 if (r)
2583 goto out;
2584 r = -EFAULT;
2f366987 2585 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 2586 goto out;
2587 r = 0;
2588 break;
2589 }
2590 case KVM_SET_REGS: {
2591 struct kvm_regs kvm_regs;
2592
2593 r = -EFAULT;
2f366987 2594 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732 2595 goto out;
bccf2150 2596 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2597 if (r)
2598 goto out;
2599 r = 0;
2600 break;
2601 }
2602 case KVM_GET_SREGS: {
2603 struct kvm_sregs kvm_sregs;
2604
bccf2150
AK		 2605 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2606 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2607 if (r)
2608 goto out;
2609 r = -EFAULT;
2f366987 2610 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 2611 goto out;
2612 r = 0;
2613 break;
2614 }
2615 case KVM_SET_SREGS: {
2616 struct kvm_sregs kvm_sregs;
2617
2618 r = -EFAULT;
2f366987 2619 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732 2620 goto out;
bccf2150 2621 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2622 if (r)
2623 goto out;
2624 r = 0;
2625 break;
2626 }
2627 case KVM_TRANSLATE: {
2628 struct kvm_translation tr;
2629
2630 r = -EFAULT;
2f366987 2631 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732 2632 goto out;
bccf2150 2633 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
6aa8b732
AK		 2634 if (r)
2635 goto out;
2636 r = -EFAULT;
2f366987 2637 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 2638 goto out;
2639 r = 0;
2640 break;
2641 }
2642 case KVM_INTERRUPT: {
2643 struct kvm_interrupt irq;
2644
2645 r = -EFAULT;
2f366987 2646 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732 2647 goto out;
bccf2150 2648 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
6aa8b732
AK		 2649 if (r)
2650 goto out;
2651 r = 0;
2652 break;
2653 }
2654 case KVM_DEBUG_GUEST: {
2655 struct kvm_debug_guest dbg;
2656
2657 r = -EFAULT;
2f366987 2658 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732 2659 goto out;
bccf2150 2660 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
6aa8b732
AK		 2661 if (r)
2662 goto out;
2663 r = 0;
2664 break;
2665 }
bccf2150 2666 case KVM_GET_MSRS:
35f3f286 2667 r = msr_io(vcpu, argp, kvm_get_msr, 1);
bccf2150
AK		 2668 break;
2669 case KVM_SET_MSRS:
2670 r = msr_io(vcpu, argp, do_set_msr, 0);
2671 break;
06465c5a
AK		 2672 case KVM_SET_CPUID: {
2673 struct kvm_cpuid __user *cpuid_arg = argp;
2674 struct kvm_cpuid cpuid;
2675
2676 r = -EFAULT;
2677 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2678 goto out;
2679 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2680 if (r)
2681 goto out;
2682 break;
2683 }
1961d276
AK		 2684 case KVM_SET_SIGNAL_MASK: {
2685 struct kvm_signal_mask __user *sigmask_arg = argp;
2686 struct kvm_signal_mask kvm_sigmask;
2687 sigset_t sigset, *p;
2688
2689 p = NULL;
2690 if (argp) {
2691 r = -EFAULT;
2692 if (copy_from_user(&kvm_sigmask, argp,
2693 sizeof kvm_sigmask))
2694 goto out;
2695 r = -EINVAL;
2696 if (kvm_sigmask.len != sizeof sigset)
2697 goto out;
2698 r = -EFAULT;
2699 if (copy_from_user(&sigset, sigmask_arg->sigset,
2700 sizeof sigset))
2701 goto out;
2702 p = &sigset;
2703 }
2704 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2705 break;
2706 }
b8836737
AK		 2707 case KVM_GET_FPU: {
2708 struct kvm_fpu fpu;
2709
2710 memset(&fpu, 0, sizeof fpu);
2711 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
2712 if (r)
2713 goto out;
2714 r = -EFAULT;
2715 if (copy_to_user(argp, &fpu, sizeof fpu))
2716 goto out;
2717 r = 0;
2718 break;
2719 }
2720 case KVM_SET_FPU: {
2721 struct kvm_fpu fpu;
2722
2723 r = -EFAULT;
2724 if (copy_from_user(&fpu, argp, sizeof fpu))
2725 goto out;
2726 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
2727 if (r)
2728 goto out;
2729 r = 0;
2730 break;
2731 }
bccf2150
AK		 2732 default:
2733 ;
2734 }
2735out:
2736 return r;
2737}
2738
2739static long kvm_vm_ioctl(struct file *filp,
2740 unsigned int ioctl, unsigned long arg)
2741{
2742 struct kvm *kvm = filp->private_data;
2743 void __user *argp = (void __user *)arg;
2744 int r = -EINVAL;
2745
2746 switch (ioctl) {
2747 case KVM_CREATE_VCPU:
2748 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2749 if (r < 0)
2750 goto out;
2751 break;
6aa8b732
AK		 2752 case KVM_SET_MEMORY_REGION: {
2753 struct kvm_memory_region kvm_mem;
2754
2755 r = -EFAULT;
2f366987 2756 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
6aa8b732 2757 goto out;
2c6f5df9 2758 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
6aa8b732
AK		 2759 if (r)
2760 goto out;
2761 break;
2762 }
2763 case KVM_GET_DIRTY_LOG: {
2764 struct kvm_dirty_log log;
2765
2766 r = -EFAULT;
2f366987 2767 if (copy_from_user(&log, argp, sizeof log))
6aa8b732 2768 goto out;
2c6f5df9 2769 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
6aa8b732
AK		 2770 if (r)
2771 goto out;
2772 break;
2773 }
e8207547
AK		 2774 case KVM_SET_MEMORY_ALIAS: {
2775 struct kvm_memory_alias alias;
2776
2777 r = -EFAULT;
2778 if (copy_from_user(&alias, argp, sizeof alias))
2779 goto out;
2780 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
2781 if (r)
2782 goto out;
2783 break;
2784 }
f17abe9a
AK		 2785 default:
2786 ;
2787 }
2788out:
2789 return r;
2790}
2791
2792static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2793 unsigned long address,
2794 int *type)
2795{
2796 struct kvm *kvm = vma->vm_file->private_data;
2797 unsigned long pgoff;
f17abe9a
AK		 2798 struct page *page;
2799
f17abe9a 2800 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
954bbbc2 2801 page = gfn_to_page(kvm, pgoff);
f17abe9a
AK		 2802 if (!page)
2803 return NOPAGE_SIGBUS;
2804 get_page(page);
cd0d9137
NAQ		 2805 if (type != NULL)
2806 *type = VM_FAULT_MINOR;
2807
f17abe9a
AK		 2808 return page;
2809}
2810
2811static struct vm_operations_struct kvm_vm_vm_ops = {
2812 .nopage = kvm_vm_nopage,
2813};
2814
2815static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2816{
2817 vma->vm_ops = &kvm_vm_vm_ops;
2818 return 0;
2819}
2820
2821static struct file_operations kvm_vm_fops = {
2822 .release = kvm_vm_release,
2823 .unlocked_ioctl = kvm_vm_ioctl,
2824 .compat_ioctl = kvm_vm_ioctl,
2825 .mmap = kvm_vm_mmap,
2826};
2827
2828static int kvm_dev_ioctl_create_vm(void)
2829{
2830 int fd, r;
2831 struct inode *inode;
2832 struct file *file;
2833 struct kvm *kvm;
2834
f17abe9a 2835 kvm = kvm_create_vm();
d6d28168
AK		 2836 if (IS_ERR(kvm))
2837 return PTR_ERR(kvm);
2838 r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
2839 if (r) {
2840 kvm_destroy_vm(kvm);
2841 return r;
f17abe9a
AK		 2842 }
2843
bccf2150 2844 kvm->filp = file;
f17abe9a 2845
f17abe9a 2846 return fd;
f17abe9a
AK		 2847}
2848
2849static long kvm_dev_ioctl(struct file *filp,
2850 unsigned int ioctl, unsigned long arg)
2851{
2852 void __user *argp = (void __user *)arg;
07c45a36 2853 long r = -EINVAL;
f17abe9a
AK		 2854
2855 switch (ioctl) {
2856 case KVM_GET_API_VERSION:
f0fe5108
AK		 2857 r = -EINVAL;
2858 if (arg)
2859 goto out;
f17abe9a
AK		 2860 r = KVM_API_VERSION;
2861 break;
2862 case KVM_CREATE_VM:
f0fe5108
AK		 2863 r = -EINVAL;
2864 if (arg)
2865 goto out;
f17abe9a
AK		 2866 r = kvm_dev_ioctl_create_vm();
2867 break;
6aa8b732 2868 case KVM_GET_MSR_INDEX_LIST: {
2f366987 2869 struct kvm_msr_list __user *user_msr_list = argp;
6aa8b732
AK		 2870 struct kvm_msr_list msr_list;
2871 unsigned n;
2872
2873 r = -EFAULT;
2874 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2875 goto out;
2876 n = msr_list.nmsrs;
6f00e68f 2877 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
6aa8b732
AK		 2878 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2879 goto out;
2880 r = -E2BIG;
bf591b24 2881 if (n < num_msrs_to_save)
6aa8b732
AK		 2882 goto out;
2883 r = -EFAULT;
2884 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 2885 num_msrs_to_save * sizeof(u32)))
6aa8b732 2886 goto out;
6f00e68f
AK		 2887 if (copy_to_user(user_msr_list->indices
2888 + num_msrs_to_save * sizeof(u32),
2889 &emulated_msrs,
2890 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2891 goto out;
6aa8b732 2892 r = 0;
cc1d8955 2893 break;
6aa8b732 2894 }
5d308f45
AK		 2895 case KVM_CHECK_EXTENSION:
2896 /*
2897 * No extensions defined at present.
2898 */
2899 r = 0;
2900 break;
07c45a36
AK		 2901 case KVM_GET_VCPU_MMAP_SIZE:
2902 r = -EINVAL;
2903 if (arg)
2904 goto out;
039576c0 2905 r = 2 * PAGE_SIZE;
07c45a36 2906 break;
6aa8b732
AK		 2907 default:
2908 ;
2909 }
2910out:
2911 return r;
2912}
2913
6aa8b732
AK		 2914static struct file_operations kvm_chardev_ops = {
2915 .open = kvm_dev_open,
2916 .release = kvm_dev_release,
2917 .unlocked_ioctl = kvm_dev_ioctl,
2918 .compat_ioctl = kvm_dev_ioctl,
6aa8b732
AK		 2919};
2920
2921static struct miscdevice kvm_dev = {
bbe4432e 2922 KVM_MINOR,
6aa8b732
AK		 2923 "kvm",
2924 &kvm_chardev_ops,
2925};
2926
774c47f1
AK		 2927/*
2928 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2929 * cached on it.
2930 */
2931static void decache_vcpus_on_cpu(int cpu)
2932{
2933 struct kvm *vm;
2934 struct kvm_vcpu *vcpu;
2935 int i;
2936
2937 spin_lock(&kvm_lock);
2938 list_for_each_entry(vm, &vm_list, vm_list)
2939 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2940 vcpu = &vm->vcpus[i];
2941 /*
2942 * If the vcpu is locked, then it is running on some
2943 * other cpu and therefore it is not cached on the
2944 * cpu in question.
2945 *
2946 * If it's not locked, check the last cpu it executed
2947 * on.
2948 */
2949 if (mutex_trylock(&vcpu->mutex)) {
2950 if (vcpu->cpu == cpu) {
2951 kvm_arch_ops->vcpu_decache(vcpu);
2952 vcpu->cpu = -1;
2953 }
2954 mutex_unlock(&vcpu->mutex);
2955 }
2956 }
2957 spin_unlock(&kvm_lock);
2958}
2959
1b6c0168
AK		 2960static void hardware_enable(void *junk)
2961{
2962 int cpu = raw_smp_processor_id();
2963
2964 if (cpu_isset(cpu, cpus_hardware_enabled))
2965 return;
2966 cpu_set(cpu, cpus_hardware_enabled);
2967 kvm_arch_ops->hardware_enable(NULL);
2968}
2969
2970static void hardware_disable(void *junk)
2971{
2972 int cpu = raw_smp_processor_id();
2973
2974 if (!cpu_isset(cpu, cpus_hardware_enabled))
2975 return;
2976 cpu_clear(cpu, cpus_hardware_enabled);
2977 decache_vcpus_on_cpu(cpu);
2978 kvm_arch_ops->hardware_disable(NULL);
2979}
2980
774c47f1
AK		 2981static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2982 void *v)
2983{
2984 int cpu = (long)v;
2985
2986 switch (val) {
cec9ad27
AK		 2987 case CPU_DYING:
2988 case CPU_DYING_FROZEN:
6ec8a856
AK		 2989 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2990 cpu);
2991 hardware_disable(NULL);
2992 break;
774c47f1 2993 case CPU_UP_CANCELED:
8bb78442 2994 case CPU_UP_CANCELED_FROZEN:
43934a38
JK		 2995 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2996 cpu);
1b6c0168 2997 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
774c47f1 2998 break;
43934a38 2999 case CPU_ONLINE:
8bb78442 3000 case CPU_ONLINE_FROZEN:
43934a38
JK		 3001 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
3002 cpu);
1b6c0168 3003 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
774c47f1
AK		 3004 break;
3005 }
3006 return NOTIFY_OK;
3007}
3008
9a2b85c6
RR		 3009static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3010 void *v)
3011{
3012 if (val == SYS_RESTART) {
3013 /*
3014 * Some (well, at least mine) BIOSes hang on reboot if
3015 * in vmx root mode.
3016 */
3017 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
3018 on_each_cpu(hardware_disable, NULL, 0, 1);
3019 }
3020 return NOTIFY_OK;
3021}
3022
3023static struct notifier_block kvm_reboot_notifier = {
3024 .notifier_call = kvm_reboot,
3025 .priority = 0,
3026};
3027
2eeb2e94
GH		 3028void kvm_io_bus_init(struct kvm_io_bus *bus)
3029{
3030 memset(bus, 0, sizeof(*bus));
3031}
3032
3033void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3034{
3035 int i;
3036
3037 for (i = 0; i < bus->dev_count; i++) {
3038 struct kvm_io_device *pos = bus->devs[i];
3039
3040 kvm_iodevice_destructor(pos);
3041 }
3042}
3043
3044struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
3045{
3046 int i;
3047
3048 for (i = 0; i < bus->dev_count; i++) {
3049 struct kvm_io_device *pos = bus->devs[i];
3050
3051 if (pos->in_range(pos, addr))
3052 return pos;
3053 }
3054
3055 return NULL;
3056}
3057
3058void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
3059{
3060 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
3061
3062 bus->devs[bus->dev_count++] = dev;
3063}
3064
774c47f1
AK		 3065static struct notifier_block kvm_cpu_notifier = {
3066 .notifier_call = kvm_cpu_hotplug,
3067 .priority = 20, /* must be > scheduler priority */
3068};
3069
1165f5fe
AK		 3070static u64 stat_get(void *_offset)
3071{
3072 unsigned offset = (long)_offset;
3073 u64 total = 0;
3074 struct kvm *kvm;
3075 struct kvm_vcpu *vcpu;
3076 int i;
3077
3078 spin_lock(&kvm_lock);
3079 list_for_each_entry(kvm, &vm_list, vm_list)
3080 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3081 vcpu = &kvm->vcpus[i];
3082 total += *(u32 *)((void *)vcpu + offset);
3083 }
3084 spin_unlock(&kvm_lock);
3085 return total;
3086}
3087
3088static void stat_set(void *offset, u64 val)
3089{
3090}
3091
3092DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, stat_set, "%llu\n");
3093
6aa8b732
AK		 3094static __init void kvm_init_debug(void)
3095{
3096 struct kvm_stats_debugfs_item *p;
3097
8b6d44c7 3098 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732 3099 for (p = debugfs_entries; p->name; ++p)
1165f5fe
AK		 3100 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
3101 (void *)(long)p->offset,
3102 &stat_fops);
6aa8b732
AK		 3103}
3104
3105static void kvm_exit_debug(void)
3106{
3107 struct kvm_stats_debugfs_item *p;
3108
3109 for (p = debugfs_entries; p->name; ++p)
3110 debugfs_remove(p->dentry);
3111 debugfs_remove(debugfs_dir);
3112}
3113
59ae6c6b
AK		 3114static int kvm_suspend(struct sys_device *dev, pm_message_t state)
3115{
4267c41a 3116 hardware_disable(NULL);
59ae6c6b
AK		 3117 return 0;
3118}
3119
3120static int kvm_resume(struct sys_device *dev)
3121{
4267c41a 3122 hardware_enable(NULL);
59ae6c6b
AK		 3123 return 0;
3124}
3125
3126static struct sysdev_class kvm_sysdev_class = {
3127 set_kset_name("kvm"),
3128 .suspend = kvm_suspend,
3129 .resume = kvm_resume,
3130};
3131
3132static struct sys_device kvm_sysdev = {
3133 .id = 0,
3134 .cls = &kvm_sysdev_class,
3135};
3136
6aa8b732
AK		 3137hpa_t bad_page_address;
3138
3139int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
3140{
3141 int r;
3142
09db28b8
YI		 3143 if (kvm_arch_ops) {
3144 printk(KERN_ERR "kvm: already loaded the other module\n");
3145 return -EEXIST;
3146 }
3147
e097f35c 3148 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 3149 printk(KERN_ERR "kvm: no hardware support\n");
3150 return -EOPNOTSUPP;
3151 }
e097f35c 3152 if (ops->disabled_by_bios()) {
6aa8b732
AK		 3153 printk(KERN_ERR "kvm: disabled by bios\n");
3154 return -EOPNOTSUPP;
3155 }
3156
e097f35c
YI		 3157 kvm_arch_ops = ops;
3158
6aa8b732
AK		 3159 r = kvm_arch_ops->hardware_setup();
3160 if (r < 0)
ca45aaae 3161 goto out;
6aa8b732 3162
1b6c0168 3163 on_each_cpu(hardware_enable, NULL, 0, 1);
774c47f1
AK		 3164 r = register_cpu_notifier(&kvm_cpu_notifier);
3165 if (r)
3166 goto out_free_1;
6aa8b732
AK		 3167 register_reboot_notifier(&kvm_reboot_notifier);
3168
59ae6c6b
AK		 3169 r = sysdev_class_register(&kvm_sysdev_class);
3170 if (r)
3171 goto out_free_2;
3172
3173 r = sysdev_register(&kvm_sysdev);
3174 if (r)
3175 goto out_free_3;
3176
6aa8b732
AK		 3177 kvm_chardev_ops.owner = module;
3178
3179 r = misc_register(&kvm_dev);
3180 if (r) {
3181 printk (KERN_ERR "kvm: misc device register failed\n");
3182 goto out_free;
3183 }
3184
3185 return r;
3186
3187out_free:
59ae6c6b
AK		 3188 sysdev_unregister(&kvm_sysdev);
3189out_free_3:
3190 sysdev_class_unregister(&kvm_sysdev_class);
3191out_free_2:
6aa8b732 3192 unregister_reboot_notifier(&kvm_reboot_notifier);
774c47f1
AK		 3193 unregister_cpu_notifier(&kvm_cpu_notifier);
3194out_free_1:
1b6c0168 3195 on_each_cpu(hardware_disable, NULL, 0, 1);
6aa8b732 3196 kvm_arch_ops->hardware_unsetup();
ca45aaae
AK		 3197out:
3198 kvm_arch_ops = NULL;
6aa8b732
AK		 3199 return r;
3200}
3201
3202void kvm_exit_arch(void)
3203{
3204 misc_deregister(&kvm_dev);
59ae6c6b
AK		 3205 sysdev_unregister(&kvm_sysdev);
3206 sysdev_class_unregister(&kvm_sysdev_class);
6aa8b732 3207 unregister_reboot_notifier(&kvm_reboot_notifier);
59ae6c6b 3208 unregister_cpu_notifier(&kvm_cpu_notifier);
1b6c0168 3209 on_each_cpu(hardware_disable, NULL, 0, 1);
6aa8b732 3210 kvm_arch_ops->hardware_unsetup();
09db28b8 3211 kvm_arch_ops = NULL;
6aa8b732
AK		 3212}
3213
3214static __init int kvm_init(void)
3215{
3216 static struct page *bad_page;
37e29d90
AK		 3217 int r;
3218
b5a33a75
AK		 3219 r = kvm_mmu_module_init();
3220 if (r)
3221 goto out4;
3222
6aa8b732
AK		 3223 kvm_init_debug();
3224
bf591b24
MR		 3225 kvm_init_msr_list();
3226
6aa8b732
AK		 3227 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3228 r = -ENOMEM;
3229 goto out;
3230 }
3231
3232 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3233 memset(__va(bad_page_address), 0, PAGE_SIZE);
3234
58e690e6 3235 return 0;
6aa8b732
AK		 3236
3237out:
3238 kvm_exit_debug();
b5a33a75
AK		 3239 kvm_mmu_module_exit();
3240out4:
6aa8b732
AK		 3241 return r;
3242}
3243
3244static __exit void kvm_exit(void)
3245{
3246 kvm_exit_debug();
3247 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
b5a33a75 3248 kvm_mmu_module_exit();
6aa8b732
AK		 3249}
3250
3251module_init(kvm_init)
3252module_exit(kvm_exit)
3253
3254EXPORT_SYMBOL_GPL(kvm_init_arch);
3255EXPORT_SYMBOL_GPL(kvm_exit_arch);
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