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KVM: load_pdptrs() cleanups
[deliverable/linux.git] / drivers / kvm / kvm_main.c
CommitLineData
6aa8b732
AK		 1/*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
8 *
9 * Authors:
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
12 *
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
15 *
16 */
17
18#include "kvm.h"
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{
370 if (!vcpu->vmcs)
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{
bccf2150 380 if (!vcpu->vmcs)
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
1648void load_msrs(struct vmx_msr_entry *e, int n)
1649{
1650 int i;
1651
1652 for (i = 0; i < n; ++i)
1653 wrmsrl(e[i].index, e[i].data);
1654}
1655EXPORT_SYMBOL_GPL(load_msrs);
1656
1657void save_msrs(struct vmx_msr_entry *e, int n)
1658{
1659 int i;
1660
1661 for (i = 0; i < n; ++i)
1662 rdmsrl(e[i].index, e[i].data);
1663}
1664EXPORT_SYMBOL_GPL(save_msrs);
1665
06465c5a
AK		 1666void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1667{
1668 int i;
1669 u32 function;
1670 struct kvm_cpuid_entry *e, *best;
1671
1672 kvm_arch_ops->cache_regs(vcpu);
1673 function = vcpu->regs[VCPU_REGS_RAX];
1674 vcpu->regs[VCPU_REGS_RAX] = 0;
1675 vcpu->regs[VCPU_REGS_RBX] = 0;
1676 vcpu->regs[VCPU_REGS_RCX] = 0;
1677 vcpu->regs[VCPU_REGS_RDX] = 0;
1678 best = NULL;
1679 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1680 e = &vcpu->cpuid_entries[i];
1681 if (e->function == function) {
1682 best = e;
1683 break;
1684 }
1685 /*
1686 * Both basic or both extended?
1687 */
1688 if (((e->function ^ function) & 0x80000000) == 0)
1689 if (!best || e->function > best->function)
1690 best = e;
1691 }
1692 if (best) {
1693 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1694 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1695 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1696 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1697 }
1698 kvm_arch_ops->decache_regs(vcpu);
1699 kvm_arch_ops->skip_emulated_instruction(vcpu);
1700}
1701EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1702
039576c0 1703static int pio_copy_data(struct kvm_vcpu *vcpu)
46fc1477 1704{
039576c0
AK		 1705 void *p = vcpu->pio_data;
1706 void *q;
1707 unsigned bytes;
1708 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1709
1710 kvm_arch_ops->vcpu_put(vcpu);
1711 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1712 PAGE_KERNEL);
1713 if (!q) {
1714 kvm_arch_ops->vcpu_load(vcpu);
1715 free_pio_guest_pages(vcpu);
1716 return -ENOMEM;
1717 }
1718 q += vcpu->pio.guest_page_offset;
1719 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1720 if (vcpu->pio.in)
1721 memcpy(q, p, bytes);
1722 else
1723 memcpy(p, q, bytes);
1724 q -= vcpu->pio.guest_page_offset;
1725 vunmap(q);
1726 kvm_arch_ops->vcpu_load(vcpu);
1727 free_pio_guest_pages(vcpu);
1728 return 0;
1729}
1730
1731static int complete_pio(struct kvm_vcpu *vcpu)
1732{
1733 struct kvm_pio_request *io = &vcpu->pio;
46fc1477 1734 long delta;
039576c0 1735 int r;
46fc1477
AK		 1736
1737 kvm_arch_ops->cache_regs(vcpu);
1738
1739 if (!io->string) {
039576c0
AK		 1740 if (io->in)
1741 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
46fc1477
AK		 1742 io->size);
1743 } else {
039576c0
AK		 1744 if (io->in) {
1745 r = pio_copy_data(vcpu);
1746 if (r) {
1747 kvm_arch_ops->cache_regs(vcpu);
1748 return r;
1749 }
1750 }
1751
46fc1477
AK		 1752 delta = 1;
1753 if (io->rep) {
039576c0 1754 delta *= io->cur_count;
46fc1477
AK		 1755 /*
1756 * The size of the register should really depend on
1757 * current address size.
1758 */
1759 vcpu->regs[VCPU_REGS_RCX] -= delta;
1760 }
039576c0 1761 if (io->down)
46fc1477
AK		 1762 delta = -delta;
1763 delta *= io->size;
039576c0 1764 if (io->in)
46fc1477
AK		 1765 vcpu->regs[VCPU_REGS_RDI] += delta;
1766 else
1767 vcpu->regs[VCPU_REGS_RSI] += delta;
1768 }
1769
46fc1477
AK		 1770 kvm_arch_ops->decache_regs(vcpu);
1771
039576c0
AK		 1772 io->count -= io->cur_count;
1773 io->cur_count = 0;
1774
1775 if (!io->count)
1776 kvm_arch_ops->skip_emulated_instruction(vcpu);
1777 return 0;
46fc1477
AK		 1778}
1779
65619eb5
ED		 1780static void kernel_pio(struct kvm_io_device *pio_dev,
1781 struct kvm_vcpu *vcpu,
1782 void *pd)
74906345
ED		 1783{
1784 /* TODO: String I/O for in kernel device */
1785
1786 if (vcpu->pio.in)
1787 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1788 vcpu->pio.size,
65619eb5 1789 pd);
74906345
ED		 1790 else
1791 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1792 vcpu->pio.size,
65619eb5
ED		 1793 pd);
1794}
1795
1796static void pio_string_write(struct kvm_io_device *pio_dev,
1797 struct kvm_vcpu *vcpu)
1798{
1799 struct kvm_pio_request *io = &vcpu->pio;
1800 void *pd = vcpu->pio_data;
1801 int i;
1802
1803 for (i = 0; i < io->cur_count; i++) {
1804 kvm_iodevice_write(pio_dev, io->port,
1805 io->size,
1806 pd);
1807 pd += io->size;
1808 }
74906345
ED		 1809}
1810
039576c0
AK		 1811int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1812 int size, unsigned long count, int string, int down,
1813 gva_t address, int rep, unsigned port)
1814{
1815 unsigned now, in_page;
65619eb5 1816 int i, ret = 0;
039576c0
AK		 1817 int nr_pages = 1;
1818 struct page *page;
74906345 1819 struct kvm_io_device *pio_dev;
039576c0
AK		 1820
1821 vcpu->run->exit_reason = KVM_EXIT_IO;
1822 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1823 vcpu->run->io.size = size;
1824 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1825 vcpu->run->io.count = count;
1826 vcpu->run->io.port = port;
1827 vcpu->pio.count = count;
1828 vcpu->pio.cur_count = count;
1829 vcpu->pio.size = size;
1830 vcpu->pio.in = in;
74906345 1831 vcpu->pio.port = port;
039576c0
AK		 1832 vcpu->pio.string = string;
1833 vcpu->pio.down = down;
1834 vcpu->pio.guest_page_offset = offset_in_page(address);
1835 vcpu->pio.rep = rep;
1836
74906345 1837 pio_dev = vcpu_find_pio_dev(vcpu, port);
039576c0
AK		 1838 if (!string) {
1839 kvm_arch_ops->cache_regs(vcpu);
1840 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1841 kvm_arch_ops->decache_regs(vcpu);
74906345 1842 if (pio_dev) {
65619eb5 1843 kernel_pio(pio_dev, vcpu, vcpu->pio_data);
74906345
ED		 1844 complete_pio(vcpu);
1845 return 1;
1846 }
039576c0
AK		 1847 return 0;
1848 }
1849
1850 if (!count) {
1851 kvm_arch_ops->skip_emulated_instruction(vcpu);
1852 return 1;
1853 }
1854
1855 now = min(count, PAGE_SIZE / size);
1856
1857 if (!down)
1858 in_page = PAGE_SIZE - offset_in_page(address);
1859 else
1860 in_page = offset_in_page(address) + size;
1861 now = min(count, (unsigned long)in_page / size);
1862 if (!now) {
1863 /*
1864 * String I/O straddles page boundary. Pin two guest pages
1865 * so that we satisfy atomicity constraints. Do just one
1866 * transaction to avoid complexity.
1867 */
1868 nr_pages = 2;
1869 now = 1;
1870 }
1871 if (down) {
1872 /*
1873 * String I/O in reverse. Yuck. Kill the guest, fix later.
1874 */
1875 printk(KERN_ERR "kvm: guest string pio down\n");
1876 inject_gp(vcpu);
1877 return 1;
1878 }
1879 vcpu->run->io.count = now;
1880 vcpu->pio.cur_count = now;
1881
1882 for (i = 0; i < nr_pages; ++i) {
1883 spin_lock(&vcpu->kvm->lock);
1884 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1885 if (page)
1886 get_page(page);
1887 vcpu->pio.guest_pages[i] = page;
1888 spin_unlock(&vcpu->kvm->lock);
1889 if (!page) {
1890 inject_gp(vcpu);
1891 free_pio_guest_pages(vcpu);
1892 return 1;
1893 }
1894 }
1895
65619eb5
ED		 1896 if (!vcpu->pio.in) {
1897 /* string PIO write */
1898 ret = pio_copy_data(vcpu);
1899 if (ret >= 0 && pio_dev) {
1900 pio_string_write(pio_dev, vcpu);
1901 complete_pio(vcpu);
1902 if (vcpu->pio.count == 0)
1903 ret = 1;
1904 }
1905 } else if (pio_dev)
1906 printk(KERN_ERR "no string pio read support yet, "
1907 "port %x size %d count %ld\n",
1908 port, size, count);
1909
1910 return ret;
039576c0
AK		 1911}
1912EXPORT_SYMBOL_GPL(kvm_setup_pio);
1913
bccf2150 1914static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
6aa8b732 1915{
6aa8b732 1916 int r;
1961d276 1917 sigset_t sigsaved;
6aa8b732 1918
bccf2150 1919 vcpu_load(vcpu);
6aa8b732 1920
1961d276
AK		 1921 if (vcpu->sigset_active)
1922 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
1923
54810342
DL		 1924 /* re-sync apic's tpr */
1925 vcpu->cr8 = kvm_run->cr8;
1926
02c83209
AK		 1927 if (vcpu->pio.cur_count) {
1928 r = complete_pio(vcpu);
1929 if (r)
1930 goto out;
1931 }
1932
1933 if (vcpu->mmio_needed) {
1934 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1935 vcpu->mmio_read_completed = 1;
1936 vcpu->mmio_needed = 0;
1937 r = emulate_instruction(vcpu, kvm_run,
1938 vcpu->mmio_fault_cr2, 0);
1939 if (r == EMULATE_DO_MMIO) {
1940 /*
1941 * Read-modify-write. Back to userspace.
1942 */
02c83209
AK		 1943 r = 0;
1944 goto out;
46fc1477 1945 }
6aa8b732
AK		 1946 }
1947
8eb7d334 1948 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
b4e63f56
AK		 1949 kvm_arch_ops->cache_regs(vcpu);
1950 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
1951 kvm_arch_ops->decache_regs(vcpu);
1952 }
1953
6aa8b732
AK		 1954 r = kvm_arch_ops->run(vcpu, kvm_run);
1955
039576c0 1956out:
1961d276
AK		 1957 if (vcpu->sigset_active)
1958 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1959
6aa8b732
AK		 1960 vcpu_put(vcpu);
1961 return r;
1962}
1963
bccf2150
AK		 1964static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
1965 struct kvm_regs *regs)
6aa8b732 1966{
bccf2150 1967 vcpu_load(vcpu);
6aa8b732
AK		 1968
1969 kvm_arch_ops->cache_regs(vcpu);
1970
1971 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1972 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1973 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1974 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1975 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1976 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1977 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1978 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1979#ifdef CONFIG_X86_64
6aa8b732
AK		 1980 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1981 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1982 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1983 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1984 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1985 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1986 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1987 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1988#endif
1989
1990 regs->rip = vcpu->rip;
1991 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1992
1993 /*
1994 * Don't leak debug flags in case they were set for guest debugging
1995 */
1996 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1997 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1998
1999 vcpu_put(vcpu);
2000
2001 return 0;
2002}
2003
bccf2150
AK		 2004static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
2005 struct kvm_regs *regs)
6aa8b732 2006{
bccf2150 2007 vcpu_load(vcpu);
6aa8b732
AK		 2008
2009 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
2010 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
2011 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
2012 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
2013 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
2014 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
2015 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
2016 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 2017#ifdef CONFIG_X86_64
6aa8b732
AK		 2018 vcpu->regs[VCPU_REGS_R8] = regs->r8;
2019 vcpu->regs[VCPU_REGS_R9] = regs->r9;
2020 vcpu->regs[VCPU_REGS_R10] = regs->r10;
2021 vcpu->regs[VCPU_REGS_R11] = regs->r11;
2022 vcpu->regs[VCPU_REGS_R12] = regs->r12;
2023 vcpu->regs[VCPU_REGS_R13] = regs->r13;
2024 vcpu->regs[VCPU_REGS_R14] = regs->r14;
2025 vcpu->regs[VCPU_REGS_R15] = regs->r15;
2026#endif
2027
2028 vcpu->rip = regs->rip;
2029 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
2030
2031 kvm_arch_ops->decache_regs(vcpu);
2032
2033 vcpu_put(vcpu);
2034
2035 return 0;
2036}
2037
2038static void get_segment(struct kvm_vcpu *vcpu,
2039 struct kvm_segment *var, int seg)
2040{
2041 return kvm_arch_ops->get_segment(vcpu, var, seg);
2042}
2043
bccf2150
AK		 2044static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2045 struct kvm_sregs *sregs)
6aa8b732 2046{
6aa8b732
AK		 2047 struct descriptor_table dt;
2048
bccf2150 2049 vcpu_load(vcpu);
6aa8b732
AK		 2050
2051 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2052 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2053 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2054 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2055 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2056 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2057
2058 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2059 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2060
2061 kvm_arch_ops->get_idt(vcpu, &dt);
2062 sregs->idt.limit = dt.limit;
2063 sregs->idt.base = dt.base;
2064 kvm_arch_ops->get_gdt(vcpu, &dt);
2065 sregs->gdt.limit = dt.limit;
2066 sregs->gdt.base = dt.base;
2067
25c4c276 2068 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 2069 sregs->cr0 = vcpu->cr0;
2070 sregs->cr2 = vcpu->cr2;
2071 sregs->cr3 = vcpu->cr3;
2072 sregs->cr4 = vcpu->cr4;
2073 sregs->cr8 = vcpu->cr8;
2074 sregs->efer = vcpu->shadow_efer;
2075 sregs->apic_base = vcpu->apic_base;
2076
2077 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2078 sizeof sregs->interrupt_bitmap);
2079
2080 vcpu_put(vcpu);
2081
2082 return 0;
2083}
2084
2085static void set_segment(struct kvm_vcpu *vcpu,
2086 struct kvm_segment *var, int seg)
2087{
2088 return kvm_arch_ops->set_segment(vcpu, var, seg);
2089}
2090
bccf2150
AK		 2091static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2092 struct kvm_sregs *sregs)
6aa8b732 2093{
6aa8b732
AK		 2094 int mmu_reset_needed = 0;
2095 int i;
2096 struct descriptor_table dt;
2097
bccf2150 2098 vcpu_load(vcpu);
6aa8b732 2099
6aa8b732
AK		 2100 dt.limit = sregs->idt.limit;
2101 dt.base = sregs->idt.base;
2102 kvm_arch_ops->set_idt(vcpu, &dt);
2103 dt.limit = sregs->gdt.limit;
2104 dt.base = sregs->gdt.base;
2105 kvm_arch_ops->set_gdt(vcpu, &dt);
2106
2107 vcpu->cr2 = sregs->cr2;
2108 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2109 vcpu->cr3 = sregs->cr3;
2110
2111 vcpu->cr8 = sregs->cr8;
2112
2113 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 2114#ifdef CONFIG_X86_64
6aa8b732
AK		 2115 kvm_arch_ops->set_efer(vcpu, sregs->efer);
2116#endif
2117 vcpu->apic_base = sregs->apic_base;
2118
25c4c276 2119 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
399badf3 2120
6aa8b732 2121 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
f6528b03 2122 kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
6aa8b732
AK		 2123
2124 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2125 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 2126 if (!is_long_mode(vcpu) && is_pae(vcpu))
2127 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 2128
2129 if (mmu_reset_needed)
2130 kvm_mmu_reset_context(vcpu);
2131
2132 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2133 sizeof vcpu->irq_pending);
2134 vcpu->irq_summary = 0;
9eb829ce 2135 for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i)
6aa8b732
AK		 2136 if (vcpu->irq_pending[i])
2137 __set_bit(i, &vcpu->irq_summary);
2138
024aa1c0
AK		 2139 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2140 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2141 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2142 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2143 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2144 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2145
2146 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2147 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2148
6aa8b732
AK		 2149 vcpu_put(vcpu);
2150
2151 return 0;
2152}
2153
2154/*
2155 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2156 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 2157 *
2158 * This list is modified at module load time to reflect the
2159 * capabilities of the host cpu.
6aa8b732
AK		 2160 */
2161static u32 msrs_to_save[] = {
2162 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2163 MSR_K6_STAR,
05b3e0c2 2164#ifdef CONFIG_X86_64
6aa8b732
AK		 2165 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2166#endif
2167 MSR_IA32_TIME_STAMP_COUNTER,
2168};
2169
bf591b24
MR		 2170static unsigned num_msrs_to_save;
2171
6f00e68f
AK		 2172static u32 emulated_msrs[] = {
2173 MSR_IA32_MISC_ENABLE,
2174};
2175
bf591b24
MR		 2176static __init void kvm_init_msr_list(void)
2177{
2178 u32 dummy[2];
2179 unsigned i, j;
2180
2181 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2182 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2183 continue;
2184 if (j < i)
2185 msrs_to_save[j] = msrs_to_save[i];
2186 j++;
2187 }
2188 num_msrs_to_save = j;
2189}
6aa8b732
AK		 2190
2191/*
2192 * Adapt set_msr() to msr_io()'s calling convention
2193 */
2194static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2195{
35f3f286 2196 return kvm_set_msr(vcpu, index, *data);
6aa8b732
AK		 2197}
2198
2199/*
2200 * Read or write a bunch of msrs. All parameters are kernel addresses.
2201 *
2202 * @return number of msrs set successfully.
2203 */
bccf2150 2204static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
6aa8b732
AK		 2205 struct kvm_msr_entry *entries,
2206 int (*do_msr)(struct kvm_vcpu *vcpu,
2207 unsigned index, u64 *data))
2208{
6aa8b732
AK		 2209 int i;
2210
bccf2150 2211 vcpu_load(vcpu);
6aa8b732
AK		 2212
2213 for (i = 0; i < msrs->nmsrs; ++i)
2214 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2215 break;
2216
2217 vcpu_put(vcpu);
2218
2219 return i;
2220}
2221
2222/*
2223 * Read or write a bunch of msrs. Parameters are user addresses.
2224 *
2225 * @return number of msrs set successfully.
2226 */
bccf2150 2227static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
6aa8b732
AK		 2228 int (*do_msr)(struct kvm_vcpu *vcpu,
2229 unsigned index, u64 *data),
2230 int writeback)
2231{
2232 struct kvm_msrs msrs;
2233 struct kvm_msr_entry *entries;
2234 int r, n;
2235 unsigned size;
2236
2237 r = -EFAULT;
2238 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2239 goto out;
2240
2241 r = -E2BIG;
2242 if (msrs.nmsrs >= MAX_IO_MSRS)
2243 goto out;
2244
2245 r = -ENOMEM;
2246 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2247 entries = vmalloc(size);
2248 if (!entries)
2249 goto out;
2250
2251 r = -EFAULT;
2252 if (copy_from_user(entries, user_msrs->entries, size))
2253 goto out_free;
2254
bccf2150 2255 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
6aa8b732
AK		 2256 if (r < 0)
2257 goto out_free;
2258
2259 r = -EFAULT;
2260 if (writeback && copy_to_user(user_msrs->entries, entries, size))
2261 goto out_free;
2262
2263 r = n;
2264
2265out_free:
2266 vfree(entries);
2267out:
2268 return r;
2269}
2270
2271/*
2272 * Translate a guest virtual address to a guest physical address.
2273 */
bccf2150
AK		 2274static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2275 struct kvm_translation *tr)
6aa8b732
AK		 2276{
2277 unsigned long vaddr = tr->linear_address;
6aa8b732
AK		 2278 gpa_t gpa;
2279
bccf2150
AK		 2280 vcpu_load(vcpu);
2281 spin_lock(&vcpu->kvm->lock);
6aa8b732
AK		 2282 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2283 tr->physical_address = gpa;
2284 tr->valid = gpa != UNMAPPED_GVA;
2285 tr->writeable = 1;
2286 tr->usermode = 0;
bccf2150 2287 spin_unlock(&vcpu->kvm->lock);
6aa8b732
AK		 2288 vcpu_put(vcpu);
2289
2290 return 0;
2291}
2292
bccf2150
AK		 2293static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2294 struct kvm_interrupt *irq)
6aa8b732 2295{
6aa8b732
AK		 2296 if (irq->irq < 0 || irq->irq >= 256)
2297 return -EINVAL;
bccf2150 2298 vcpu_load(vcpu);
6aa8b732
AK		 2299
2300 set_bit(irq->irq, vcpu->irq_pending);
2301 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2302
2303 vcpu_put(vcpu);
2304
2305 return 0;
2306}
2307
bccf2150
AK		 2308static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2309 struct kvm_debug_guest *dbg)
6aa8b732 2310{
6aa8b732
AK		 2311 int r;
2312
bccf2150 2313 vcpu_load(vcpu);
6aa8b732
AK		 2314
2315 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
2316
2317 vcpu_put(vcpu);
2318
2319 return r;
2320}
2321
9a2bb7f4
AK		 2322static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2323 unsigned long address,
2324 int *type)
2325{
2326 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2327 unsigned long pgoff;
2328 struct page *page;
2329
9a2bb7f4 2330 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
039576c0
AK		 2331 if (pgoff == 0)
2332 page = virt_to_page(vcpu->run);
2333 else if (pgoff == KVM_PIO_PAGE_OFFSET)
2334 page = virt_to_page(vcpu->pio_data);
2335 else
9a2bb7f4 2336 return NOPAGE_SIGBUS;
9a2bb7f4 2337 get_page(page);
cd0d9137
NAQ		 2338 if (type != NULL)
2339 *type = VM_FAULT_MINOR;
2340
9a2bb7f4
AK		 2341 return page;
2342}
2343
2344static struct vm_operations_struct kvm_vcpu_vm_ops = {
2345 .nopage = kvm_vcpu_nopage,
2346};
2347
2348static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2349{
2350 vma->vm_ops = &kvm_vcpu_vm_ops;
2351 return 0;
2352}
2353
bccf2150
AK		 2354static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2355{
2356 struct kvm_vcpu *vcpu = filp->private_data;
2357
2358 fput(vcpu->kvm->filp);
2359 return 0;
2360}
2361
2362static struct file_operations kvm_vcpu_fops = {
2363 .release = kvm_vcpu_release,
2364 .unlocked_ioctl = kvm_vcpu_ioctl,
2365 .compat_ioctl = kvm_vcpu_ioctl,
9a2bb7f4 2366 .mmap = kvm_vcpu_mmap,
bccf2150
AK		 2367};
2368
2369/*
2370 * Allocates an inode for the vcpu.
2371 */
2372static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2373{
2374 int fd, r;
2375 struct inode *inode;
2376 struct file *file;
2377
d6d28168
AK		 2378 r = anon_inode_getfd(&fd, &inode, &file,
2379 "kvm-vcpu", &kvm_vcpu_fops, vcpu);
2380 if (r)
2381 return r;
bccf2150 2382 atomic_inc(&vcpu->kvm->filp->f_count);
bccf2150 2383 return fd;
bccf2150
AK		 2384}
2385
c5ea7660
AK		 2386/*
2387 * Creates some virtual cpus. Good luck creating more than one.
2388 */
2389static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2390{
2391 int r;
2392 struct kvm_vcpu *vcpu;
9a2bb7f4 2393 struct page *page;
c5ea7660
AK		 2394
2395 r = -EINVAL;
2396 if (!valid_vcpu(n))
2397 goto out;
2398
2399 vcpu = &kvm->vcpus[n];
dad3795d 2400 vcpu->vcpu_id = n;
c5ea7660
AK		 2401
2402 mutex_lock(&vcpu->mutex);
2403
2404 if (vcpu->vmcs) {
2405 mutex_unlock(&vcpu->mutex);
2406 return -EEXIST;
2407 }
2408
9a2bb7f4
AK		 2409 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2410 r = -ENOMEM;
2411 if (!page)
2412 goto out_unlock;
2413 vcpu->run = page_address(page);
2414
039576c0
AK		 2415 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2416 r = -ENOMEM;
2417 if (!page)
2418 goto out_free_run;
2419 vcpu->pio_data = page_address(page);
2420
c5ea7660
AK		 2421 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
2422 FX_IMAGE_ALIGN);
2423 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
d917a6b9 2424 vcpu->cr0 = 0x10;
c5ea7660
AK		 2425
2426 r = kvm_arch_ops->vcpu_create(vcpu);
2427 if (r < 0)
2428 goto out_free_vcpus;
2429
2430 r = kvm_mmu_create(vcpu);
2431 if (r < 0)
2432 goto out_free_vcpus;
2433
2434 kvm_arch_ops->vcpu_load(vcpu);
2435 r = kvm_mmu_setup(vcpu);
2436 if (r >= 0)
2437 r = kvm_arch_ops->vcpu_setup(vcpu);
2438 vcpu_put(vcpu);
2439
2440 if (r < 0)
2441 goto out_free_vcpus;
2442
bccf2150
AK		 2443 r = create_vcpu_fd(vcpu);
2444 if (r < 0)
2445 goto out_free_vcpus;
2446
39c3b86e
AK		 2447 spin_lock(&kvm_lock);
2448 if (n >= kvm->nvcpus)
2449 kvm->nvcpus = n + 1;
2450 spin_unlock(&kvm_lock);
2451
bccf2150 2452 return r;
c5ea7660
AK		 2453
2454out_free_vcpus:
2455 kvm_free_vcpu(vcpu);
039576c0
AK		 2456out_free_run:
2457 free_page((unsigned long)vcpu->run);
2458 vcpu->run = NULL;
9a2bb7f4 2459out_unlock:
c5ea7660
AK		 2460 mutex_unlock(&vcpu->mutex);
2461out:
2462 return r;
2463}
2464
2cc51560
ED		 2465static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2466{
2467 u64 efer;
2468 int i;
2469 struct kvm_cpuid_entry *e, *entry;
2470
2471 rdmsrl(MSR_EFER, efer);
2472 entry = NULL;
2473 for (i = 0; i < vcpu->cpuid_nent; ++i) {
2474 e = &vcpu->cpuid_entries[i];
2475 if (e->function == 0x80000001) {
2476 entry = e;
2477 break;
2478 }
2479 }
4c981b43 2480 if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) {
2cc51560 2481 entry->edx &= ~(1 << 20);
4c981b43 2482 printk(KERN_INFO "kvm: guest NX capability removed\n");
2cc51560
ED		 2483 }
2484}
2485
06465c5a
AK		 2486static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2487 struct kvm_cpuid *cpuid,
2488 struct kvm_cpuid_entry __user *entries)
2489{
2490 int r;
2491
2492 r = -E2BIG;
2493 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2494 goto out;
2495 r = -EFAULT;
2496 if (copy_from_user(&vcpu->cpuid_entries, entries,
2497 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2498 goto out;
2499 vcpu->cpuid_nent = cpuid->nent;
2cc51560 2500 cpuid_fix_nx_cap(vcpu);
06465c5a
AK		 2501 return 0;
2502
2503out:
2504 return r;
2505}
2506
1961d276
AK		 2507static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2508{
2509 if (sigset) {
2510 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2511 vcpu->sigset_active = 1;
2512 vcpu->sigset = *sigset;
2513 } else
2514 vcpu->sigset_active = 0;
2515 return 0;
2516}
2517
b8836737
AK		 2518/*
2519 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2520 * we have asm/x86/processor.h
2521 */
2522struct fxsave {
2523 u16 cwd;
2524 u16 swd;
2525 u16 twd;
2526 u16 fop;
2527 u64 rip;
2528 u64 rdp;
2529 u32 mxcsr;
2530 u32 mxcsr_mask;
2531 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2532#ifdef CONFIG_X86_64
2533 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2534#else
2535 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2536#endif
2537};
2538
2539static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2540{
2541 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2542
2543 vcpu_load(vcpu);
2544
2545 memcpy(fpu->fpr, fxsave->st_space, 128);
2546 fpu->fcw = fxsave->cwd;
2547 fpu->fsw = fxsave->swd;
2548 fpu->ftwx = fxsave->twd;
2549 fpu->last_opcode = fxsave->fop;
2550 fpu->last_ip = fxsave->rip;
2551 fpu->last_dp = fxsave->rdp;
2552 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2553
2554 vcpu_put(vcpu);
2555
2556 return 0;
2557}
2558
2559static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2560{
2561 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2562
2563 vcpu_load(vcpu);
2564
2565 memcpy(fxsave->st_space, fpu->fpr, 128);
2566 fxsave->cwd = fpu->fcw;
2567 fxsave->swd = fpu->fsw;
2568 fxsave->twd = fpu->ftwx;
2569 fxsave->fop = fpu->last_opcode;
2570 fxsave->rip = fpu->last_ip;
2571 fxsave->rdp = fpu->last_dp;
2572 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2573
2574 vcpu_put(vcpu);
2575
2576 return 0;
2577}
2578
bccf2150
AK		 2579static long kvm_vcpu_ioctl(struct file *filp,
2580 unsigned int ioctl, unsigned long arg)
6aa8b732 2581{
bccf2150 2582 struct kvm_vcpu *vcpu = filp->private_data;
2f366987 2583 void __user *argp = (void __user *)arg;
6aa8b732
AK		 2584 int r = -EINVAL;
2585
2586 switch (ioctl) {
9a2bb7f4 2587 case KVM_RUN:
f0fe5108
AK		 2588 r = -EINVAL;
2589 if (arg)
2590 goto out;
9a2bb7f4 2591 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
6aa8b732 2592 break;
6aa8b732
AK		 2593 case KVM_GET_REGS: {
2594 struct kvm_regs kvm_regs;
2595
bccf2150
AK		 2596 memset(&kvm_regs, 0, sizeof kvm_regs);
2597 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2598 if (r)
2599 goto out;
2600 r = -EFAULT;
2f366987 2601 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 2602 goto out;
2603 r = 0;
2604 break;
2605 }
2606 case KVM_SET_REGS: {
2607 struct kvm_regs kvm_regs;
2608
2609 r = -EFAULT;
2f366987 2610 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732 2611 goto out;
bccf2150 2612 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2613 if (r)
2614 goto out;
2615 r = 0;
2616 break;
2617 }
2618 case KVM_GET_SREGS: {
2619 struct kvm_sregs kvm_sregs;
2620
bccf2150
AK		 2621 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2622 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2623 if (r)
2624 goto out;
2625 r = -EFAULT;
2f366987 2626 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 2627 goto out;
2628 r = 0;
2629 break;
2630 }
2631 case KVM_SET_SREGS: {
2632 struct kvm_sregs kvm_sregs;
2633
2634 r = -EFAULT;
2f366987 2635 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732 2636 goto out;
bccf2150 2637 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2638 if (r)
2639 goto out;
2640 r = 0;
2641 break;
2642 }
2643 case KVM_TRANSLATE: {
2644 struct kvm_translation tr;
2645
2646 r = -EFAULT;
2f366987 2647 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732 2648 goto out;
bccf2150 2649 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
6aa8b732
AK		 2650 if (r)
2651 goto out;
2652 r = -EFAULT;
2f366987 2653 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 2654 goto out;
2655 r = 0;
2656 break;
2657 }
2658 case KVM_INTERRUPT: {
2659 struct kvm_interrupt irq;
2660
2661 r = -EFAULT;
2f366987 2662 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732 2663 goto out;
bccf2150 2664 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
6aa8b732
AK		 2665 if (r)
2666 goto out;
2667 r = 0;
2668 break;
2669 }
2670 case KVM_DEBUG_GUEST: {
2671 struct kvm_debug_guest dbg;
2672
2673 r = -EFAULT;
2f366987 2674 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732 2675 goto out;
bccf2150 2676 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
6aa8b732
AK		 2677 if (r)
2678 goto out;
2679 r = 0;
2680 break;
2681 }
bccf2150 2682 case KVM_GET_MSRS:
35f3f286 2683 r = msr_io(vcpu, argp, kvm_get_msr, 1);
bccf2150
AK		 2684 break;
2685 case KVM_SET_MSRS:
2686 r = msr_io(vcpu, argp, do_set_msr, 0);
2687 break;
06465c5a
AK		 2688 case KVM_SET_CPUID: {
2689 struct kvm_cpuid __user *cpuid_arg = argp;
2690 struct kvm_cpuid cpuid;
2691
2692 r = -EFAULT;
2693 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2694 goto out;
2695 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2696 if (r)
2697 goto out;
2698 break;
2699 }
1961d276
AK		 2700 case KVM_SET_SIGNAL_MASK: {
2701 struct kvm_signal_mask __user *sigmask_arg = argp;
2702 struct kvm_signal_mask kvm_sigmask;
2703 sigset_t sigset, *p;
2704
2705 p = NULL;
2706 if (argp) {
2707 r = -EFAULT;
2708 if (copy_from_user(&kvm_sigmask, argp,
2709 sizeof kvm_sigmask))
2710 goto out;
2711 r = -EINVAL;
2712 if (kvm_sigmask.len != sizeof sigset)
2713 goto out;
2714 r = -EFAULT;
2715 if (copy_from_user(&sigset, sigmask_arg->sigset,
2716 sizeof sigset))
2717 goto out;
2718 p = &sigset;
2719 }
2720 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2721 break;
2722 }
b8836737
AK		 2723 case KVM_GET_FPU: {
2724 struct kvm_fpu fpu;
2725
2726 memset(&fpu, 0, sizeof fpu);
2727 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
2728 if (r)
2729 goto out;
2730 r = -EFAULT;
2731 if (copy_to_user(argp, &fpu, sizeof fpu))
2732 goto out;
2733 r = 0;
2734 break;
2735 }
2736 case KVM_SET_FPU: {
2737 struct kvm_fpu fpu;
2738
2739 r = -EFAULT;
2740 if (copy_from_user(&fpu, argp, sizeof fpu))
2741 goto out;
2742 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
2743 if (r)
2744 goto out;
2745 r = 0;
2746 break;
2747 }
bccf2150
AK		 2748 default:
2749 ;
2750 }
2751out:
2752 return r;
2753}
2754
2755static long kvm_vm_ioctl(struct file *filp,
2756 unsigned int ioctl, unsigned long arg)
2757{
2758 struct kvm *kvm = filp->private_data;
2759 void __user *argp = (void __user *)arg;
2760 int r = -EINVAL;
2761
2762 switch (ioctl) {
2763 case KVM_CREATE_VCPU:
2764 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2765 if (r < 0)
2766 goto out;
2767 break;
6aa8b732
AK		 2768 case KVM_SET_MEMORY_REGION: {
2769 struct kvm_memory_region kvm_mem;
2770
2771 r = -EFAULT;
2f366987 2772 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
6aa8b732 2773 goto out;
2c6f5df9 2774 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
6aa8b732
AK		 2775 if (r)
2776 goto out;
2777 break;
2778 }
2779 case KVM_GET_DIRTY_LOG: {
2780 struct kvm_dirty_log log;
2781
2782 r = -EFAULT;
2f366987 2783 if (copy_from_user(&log, argp, sizeof log))
6aa8b732 2784 goto out;
2c6f5df9 2785 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
6aa8b732
AK		 2786 if (r)
2787 goto out;
2788 break;
2789 }
e8207547
AK		 2790 case KVM_SET_MEMORY_ALIAS: {
2791 struct kvm_memory_alias alias;
2792
2793 r = -EFAULT;
2794 if (copy_from_user(&alias, argp, sizeof alias))
2795 goto out;
2796 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
2797 if (r)
2798 goto out;
2799 break;
2800 }
f17abe9a
AK		 2801 default:
2802 ;
2803 }
2804out:
2805 return r;
2806}
2807
2808static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2809 unsigned long address,
2810 int *type)
2811{
2812 struct kvm *kvm = vma->vm_file->private_data;
2813 unsigned long pgoff;
f17abe9a
AK		 2814 struct page *page;
2815
f17abe9a 2816 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
954bbbc2 2817 page = gfn_to_page(kvm, pgoff);
f17abe9a
AK		 2818 if (!page)
2819 return NOPAGE_SIGBUS;
2820 get_page(page);
cd0d9137
NAQ		 2821 if (type != NULL)
2822 *type = VM_FAULT_MINOR;
2823
f17abe9a
AK		 2824 return page;
2825}
2826
2827static struct vm_operations_struct kvm_vm_vm_ops = {
2828 .nopage = kvm_vm_nopage,
2829};
2830
2831static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2832{
2833 vma->vm_ops = &kvm_vm_vm_ops;
2834 return 0;
2835}
2836
2837static struct file_operations kvm_vm_fops = {
2838 .release = kvm_vm_release,
2839 .unlocked_ioctl = kvm_vm_ioctl,
2840 .compat_ioctl = kvm_vm_ioctl,
2841 .mmap = kvm_vm_mmap,
2842};
2843
2844static int kvm_dev_ioctl_create_vm(void)
2845{
2846 int fd, r;
2847 struct inode *inode;
2848 struct file *file;
2849 struct kvm *kvm;
2850
f17abe9a 2851 kvm = kvm_create_vm();
d6d28168
AK		 2852 if (IS_ERR(kvm))
2853 return PTR_ERR(kvm);
2854 r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
2855 if (r) {
2856 kvm_destroy_vm(kvm);
2857 return r;
f17abe9a
AK		 2858 }
2859
bccf2150 2860 kvm->filp = file;
f17abe9a 2861
f17abe9a 2862 return fd;
f17abe9a
AK		 2863}
2864
2865static long kvm_dev_ioctl(struct file *filp,
2866 unsigned int ioctl, unsigned long arg)
2867{
2868 void __user *argp = (void __user *)arg;
07c45a36 2869 long r = -EINVAL;
f17abe9a
AK		 2870
2871 switch (ioctl) {
2872 case KVM_GET_API_VERSION:
f0fe5108
AK		 2873 r = -EINVAL;
2874 if (arg)
2875 goto out;
f17abe9a
AK		 2876 r = KVM_API_VERSION;
2877 break;
2878 case KVM_CREATE_VM:
f0fe5108
AK		 2879 r = -EINVAL;
2880 if (arg)
2881 goto out;
f17abe9a
AK		 2882 r = kvm_dev_ioctl_create_vm();
2883 break;
6aa8b732 2884 case KVM_GET_MSR_INDEX_LIST: {
2f366987 2885 struct kvm_msr_list __user *user_msr_list = argp;
6aa8b732
AK		 2886 struct kvm_msr_list msr_list;
2887 unsigned n;
2888
2889 r = -EFAULT;
2890 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2891 goto out;
2892 n = msr_list.nmsrs;
6f00e68f 2893 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
6aa8b732
AK		 2894 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2895 goto out;
2896 r = -E2BIG;
bf591b24 2897 if (n < num_msrs_to_save)
6aa8b732
AK		 2898 goto out;
2899 r = -EFAULT;
2900 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 2901 num_msrs_to_save * sizeof(u32)))
6aa8b732 2902 goto out;
6f00e68f
AK		 2903 if (copy_to_user(user_msr_list->indices
2904 + num_msrs_to_save * sizeof(u32),
2905 &emulated_msrs,
2906 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2907 goto out;
6aa8b732 2908 r = 0;
cc1d8955 2909 break;
6aa8b732 2910 }
5d308f45
AK		 2911 case KVM_CHECK_EXTENSION:
2912 /*
2913 * No extensions defined at present.
2914 */
2915 r = 0;
2916 break;
07c45a36
AK		 2917 case KVM_GET_VCPU_MMAP_SIZE:
2918 r = -EINVAL;
2919 if (arg)
2920 goto out;
039576c0 2921 r = 2 * PAGE_SIZE;
07c45a36 2922 break;
6aa8b732
AK		 2923 default:
2924 ;
2925 }
2926out:
2927 return r;
2928}
2929
6aa8b732
AK		 2930static struct file_operations kvm_chardev_ops = {
2931 .open = kvm_dev_open,
2932 .release = kvm_dev_release,
2933 .unlocked_ioctl = kvm_dev_ioctl,
2934 .compat_ioctl = kvm_dev_ioctl,
6aa8b732
AK		 2935};
2936
2937static struct miscdevice kvm_dev = {
bbe4432e 2938 KVM_MINOR,
6aa8b732
AK		 2939 "kvm",
2940 &kvm_chardev_ops,
2941};
2942
774c47f1
AK		 2943/*
2944 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2945 * cached on it.
2946 */
2947static void decache_vcpus_on_cpu(int cpu)
2948{
2949 struct kvm *vm;
2950 struct kvm_vcpu *vcpu;
2951 int i;
2952
2953 spin_lock(&kvm_lock);
2954 list_for_each_entry(vm, &vm_list, vm_list)
2955 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2956 vcpu = &vm->vcpus[i];
2957 /*
2958 * If the vcpu is locked, then it is running on some
2959 * other cpu and therefore it is not cached on the
2960 * cpu in question.
2961 *
2962 * If it's not locked, check the last cpu it executed
2963 * on.
2964 */
2965 if (mutex_trylock(&vcpu->mutex)) {
2966 if (vcpu->cpu == cpu) {
2967 kvm_arch_ops->vcpu_decache(vcpu);
2968 vcpu->cpu = -1;
2969 }
2970 mutex_unlock(&vcpu->mutex);
2971 }
2972 }
2973 spin_unlock(&kvm_lock);
2974}
2975
1b6c0168
AK		 2976static void hardware_enable(void *junk)
2977{
2978 int cpu = raw_smp_processor_id();
2979
2980 if (cpu_isset(cpu, cpus_hardware_enabled))
2981 return;
2982 cpu_set(cpu, cpus_hardware_enabled);
2983 kvm_arch_ops->hardware_enable(NULL);
2984}
2985
2986static void hardware_disable(void *junk)
2987{
2988 int cpu = raw_smp_processor_id();
2989
2990 if (!cpu_isset(cpu, cpus_hardware_enabled))
2991 return;
2992 cpu_clear(cpu, cpus_hardware_enabled);
2993 decache_vcpus_on_cpu(cpu);
2994 kvm_arch_ops->hardware_disable(NULL);
2995}
2996
774c47f1
AK		 2997static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2998 void *v)
2999{
3000 int cpu = (long)v;
3001
3002 switch (val) {
cec9ad27
AK		 3003 case CPU_DYING:
3004 case CPU_DYING_FROZEN:
6ec8a856
AK		 3005 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
3006 cpu);
3007 hardware_disable(NULL);
3008 break;
774c47f1 3009 case CPU_UP_CANCELED:
8bb78442 3010 case CPU_UP_CANCELED_FROZEN:
43934a38
JK		 3011 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
3012 cpu);
1b6c0168 3013 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
774c47f1 3014 break;
43934a38 3015 case CPU_ONLINE:
8bb78442 3016 case CPU_ONLINE_FROZEN:
43934a38
JK		 3017 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
3018 cpu);
1b6c0168 3019 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
774c47f1
AK		 3020 break;
3021 }
3022 return NOTIFY_OK;
3023}
3024
9a2b85c6
RR		 3025static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3026 void *v)
3027{
3028 if (val == SYS_RESTART) {
3029 /*
3030 * Some (well, at least mine) BIOSes hang on reboot if
3031 * in vmx root mode.
3032 */
3033 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
3034 on_each_cpu(hardware_disable, NULL, 0, 1);
3035 }
3036 return NOTIFY_OK;
3037}
3038
3039static struct notifier_block kvm_reboot_notifier = {
3040 .notifier_call = kvm_reboot,
3041 .priority = 0,
3042};
3043
2eeb2e94
GH		 3044void kvm_io_bus_init(struct kvm_io_bus *bus)
3045{
3046 memset(bus, 0, sizeof(*bus));
3047}
3048
3049void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3050{
3051 int i;
3052
3053 for (i = 0; i < bus->dev_count; i++) {
3054 struct kvm_io_device *pos = bus->devs[i];
3055
3056 kvm_iodevice_destructor(pos);
3057 }
3058}
3059
3060struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
3061{
3062 int i;
3063
3064 for (i = 0; i < bus->dev_count; i++) {
3065 struct kvm_io_device *pos = bus->devs[i];
3066
3067 if (pos->in_range(pos, addr))
3068 return pos;
3069 }
3070
3071 return NULL;
3072}
3073
3074void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
3075{
3076 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
3077
3078 bus->devs[bus->dev_count++] = dev;
3079}
3080
774c47f1
AK		 3081static struct notifier_block kvm_cpu_notifier = {
3082 .notifier_call = kvm_cpu_hotplug,
3083 .priority = 20, /* must be > scheduler priority */
3084};
3085
1165f5fe
AK		 3086static u64 stat_get(void *_offset)
3087{
3088 unsigned offset = (long)_offset;
3089 u64 total = 0;
3090 struct kvm *kvm;
3091 struct kvm_vcpu *vcpu;
3092 int i;
3093
3094 spin_lock(&kvm_lock);
3095 list_for_each_entry(kvm, &vm_list, vm_list)
3096 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3097 vcpu = &kvm->vcpus[i];
3098 total += *(u32 *)((void *)vcpu + offset);
3099 }
3100 spin_unlock(&kvm_lock);
3101 return total;
3102}
3103
3104static void stat_set(void *offset, u64 val)
3105{
3106}
3107
3108DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, stat_set, "%llu\n");
3109
6aa8b732
AK		 3110static __init void kvm_init_debug(void)
3111{
3112 struct kvm_stats_debugfs_item *p;
3113
8b6d44c7 3114 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732 3115 for (p = debugfs_entries; p->name; ++p)
1165f5fe
AK		 3116 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
3117 (void *)(long)p->offset,
3118 &stat_fops);
6aa8b732
AK		 3119}
3120
3121static void kvm_exit_debug(void)
3122{
3123 struct kvm_stats_debugfs_item *p;
3124
3125 for (p = debugfs_entries; p->name; ++p)
3126 debugfs_remove(p->dentry);
3127 debugfs_remove(debugfs_dir);
3128}
3129
59ae6c6b
AK		 3130static int kvm_suspend(struct sys_device *dev, pm_message_t state)
3131{
4267c41a 3132 hardware_disable(NULL);
59ae6c6b
AK		 3133 return 0;
3134}
3135
3136static int kvm_resume(struct sys_device *dev)
3137{
4267c41a 3138 hardware_enable(NULL);
59ae6c6b
AK		 3139 return 0;
3140}
3141
3142static struct sysdev_class kvm_sysdev_class = {
3143 set_kset_name("kvm"),
3144 .suspend = kvm_suspend,
3145 .resume = kvm_resume,
3146};
3147
3148static struct sys_device kvm_sysdev = {
3149 .id = 0,
3150 .cls = &kvm_sysdev_class,
3151};
3152
6aa8b732
AK		 3153hpa_t bad_page_address;
3154
3155int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
3156{
3157 int r;
3158
09db28b8
YI		 3159 if (kvm_arch_ops) {
3160 printk(KERN_ERR "kvm: already loaded the other module\n");
3161 return -EEXIST;
3162 }
3163
e097f35c 3164 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 3165 printk(KERN_ERR "kvm: no hardware support\n");
3166 return -EOPNOTSUPP;
3167 }
e097f35c 3168 if (ops->disabled_by_bios()) {
6aa8b732
AK		 3169 printk(KERN_ERR "kvm: disabled by bios\n");
3170 return -EOPNOTSUPP;
3171 }
3172
e097f35c
YI		 3173 kvm_arch_ops = ops;
3174
6aa8b732
AK		 3175 r = kvm_arch_ops->hardware_setup();
3176 if (r < 0)
ca45aaae 3177 goto out;
6aa8b732 3178
1b6c0168 3179 on_each_cpu(hardware_enable, NULL, 0, 1);
774c47f1
AK		 3180 r = register_cpu_notifier(&kvm_cpu_notifier);
3181 if (r)
3182 goto out_free_1;
6aa8b732
AK		 3183 register_reboot_notifier(&kvm_reboot_notifier);
3184
59ae6c6b
AK		 3185 r = sysdev_class_register(&kvm_sysdev_class);
3186 if (r)
3187 goto out_free_2;
3188
3189 r = sysdev_register(&kvm_sysdev);
3190 if (r)
3191 goto out_free_3;
3192
6aa8b732
AK		 3193 kvm_chardev_ops.owner = module;
3194
3195 r = misc_register(&kvm_dev);
3196 if (r) {
3197 printk (KERN_ERR "kvm: misc device register failed\n");
3198 goto out_free;
3199 }
3200
3201 return r;
3202
3203out_free:
59ae6c6b
AK		 3204 sysdev_unregister(&kvm_sysdev);
3205out_free_3:
3206 sysdev_class_unregister(&kvm_sysdev_class);
3207out_free_2:
6aa8b732 3208 unregister_reboot_notifier(&kvm_reboot_notifier);
774c47f1
AK		 3209 unregister_cpu_notifier(&kvm_cpu_notifier);
3210out_free_1:
1b6c0168 3211 on_each_cpu(hardware_disable, NULL, 0, 1);
6aa8b732 3212 kvm_arch_ops->hardware_unsetup();
ca45aaae
AK		 3213out:
3214 kvm_arch_ops = NULL;
6aa8b732
AK		 3215 return r;
3216}
3217
3218void kvm_exit_arch(void)
3219{
3220 misc_deregister(&kvm_dev);
59ae6c6b
AK		 3221 sysdev_unregister(&kvm_sysdev);
3222 sysdev_class_unregister(&kvm_sysdev_class);
6aa8b732 3223 unregister_reboot_notifier(&kvm_reboot_notifier);
59ae6c6b 3224 unregister_cpu_notifier(&kvm_cpu_notifier);
1b6c0168 3225 on_each_cpu(hardware_disable, NULL, 0, 1);
6aa8b732 3226 kvm_arch_ops->hardware_unsetup();
09db28b8 3227 kvm_arch_ops = NULL;
6aa8b732
AK		 3228}
3229
3230static __init int kvm_init(void)
3231{
3232 static struct page *bad_page;
37e29d90
AK		 3233 int r;
3234
b5a33a75
AK		 3235 r = kvm_mmu_module_init();
3236 if (r)
3237 goto out4;
3238
6aa8b732
AK		 3239 kvm_init_debug();
3240
bf591b24
MR		 3241 kvm_init_msr_list();
3242
6aa8b732
AK		 3243 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3244 r = -ENOMEM;
3245 goto out;
3246 }
3247
3248 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3249 memset(__va(bad_page_address), 0, PAGE_SIZE);
3250
58e690e6 3251 return 0;
6aa8b732
AK		 3252
3253out:
3254 kvm_exit_debug();
b5a33a75
AK		 3255 kvm_mmu_module_exit();
3256out4:
6aa8b732
AK		 3257 return r;
3258}
3259
3260static __exit void kvm_exit(void)
3261{
3262 kvm_exit_debug();
3263 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
b5a33a75 3264 kvm_mmu_module_exit();
6aa8b732
AK		 3265}
3266
3267module_init(kvm_init)
3268module_exit(kvm_exit)
3269
3270EXPORT_SYMBOL_GPL(kvm_init_arch);
3271EXPORT_SYMBOL_GPL(kvm_exit_arch);
Linux kernel - Deliverables
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