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SMP: Allow smp_call_function_single() to current cpu
[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
6aa8b732 53struct kvm_arch_ops *kvm_arch_ops;
1165f5fe
AK		 54
55#define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
6aa8b732
AK		 56
57static struct kvm_stats_debugfs_item {
58 const char *name;
1165f5fe 59 int offset;
6aa8b732
AK		 60 struct dentry *dentry;
61} debugfs_entries[] = {
1165f5fe
AK		 62 { "pf_fixed", STAT_OFFSET(pf_fixed) },
63 { "pf_guest", STAT_OFFSET(pf_guest) },
64 { "tlb_flush", STAT_OFFSET(tlb_flush) },
65 { "invlpg", STAT_OFFSET(invlpg) },
66 { "exits", STAT_OFFSET(exits) },
67 { "io_exits", STAT_OFFSET(io_exits) },
68 { "mmio_exits", STAT_OFFSET(mmio_exits) },
69 { "signal_exits", STAT_OFFSET(signal_exits) },
70 { "irq_window", STAT_OFFSET(irq_window_exits) },
71 { "halt_exits", STAT_OFFSET(halt_exits) },
72 { "request_irq", STAT_OFFSET(request_irq_exits) },
73 { "irq_exits", STAT_OFFSET(irq_exits) },
e6adf283 74 { "light_exits", STAT_OFFSET(light_exits) },
2cc51560 75 { "efer_reload", STAT_OFFSET(efer_reload) },
1165f5fe 76 { NULL }
6aa8b732
AK		 77};
78
79static struct dentry *debugfs_dir;
80
81#define MAX_IO_MSRS 256
82
83#define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
84#define LMSW_GUEST_MASK 0x0eULL
85#define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
86#define CR8_RESEVED_BITS (~0x0fULL)
87#define EFER_RESERVED_BITS 0xfffffffffffff2fe
88
05b3e0c2 89#ifdef CONFIG_X86_64
6aa8b732
AK		 90// LDT or TSS descriptor in the GDT. 16 bytes.
91struct segment_descriptor_64 {
92 struct segment_descriptor s;
93 u32 base_higher;
94 u32 pad_zero;
95};
96
97#endif
98
bccf2150
AK		 99static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
100 unsigned long arg);
101
6aa8b732
AK		 102unsigned long segment_base(u16 selector)
103{
104 struct descriptor_table gdt;
105 struct segment_descriptor *d;
106 unsigned long table_base;
107 typedef unsigned long ul;
108 unsigned long v;
109
110 if (selector == 0)
111 return 0;
112
113 asm ("sgdt %0" : "=m"(gdt));
114 table_base = gdt.base;
115
116 if (selector & 4) { /* from ldt */
117 u16 ldt_selector;
118
119 asm ("sldt %0" : "=g"(ldt_selector));
120 table_base = segment_base(ldt_selector);
121 }
122 d = (struct segment_descriptor *)(table_base + (selector & ~7));
123 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
05b3e0c2 124#ifdef CONFIG_X86_64
6aa8b732
AK		 125 if (d->system == 0
126 && (d->type == 2 || d->type == 9 || d->type == 11))
127 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
128#endif
129 return v;
130}
131EXPORT_SYMBOL_GPL(segment_base);
132
5aacf0ca
JM		 133static inline int valid_vcpu(int n)
134{
135 return likely(n >= 0 && n < KVM_MAX_VCPUS);
136}
137
d27d4aca
AK		 138int kvm_read_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
139 void *dest)
6aa8b732
AK		 140{
141 unsigned char *host_buf = dest;
142 unsigned long req_size = size;
143
144 while (size) {
145 hpa_t paddr;
146 unsigned now;
147 unsigned offset;
148 hva_t guest_buf;
149
150 paddr = gva_to_hpa(vcpu, addr);
151
152 if (is_error_hpa(paddr))
153 break;
154
155 guest_buf = (hva_t)kmap_atomic(
156 pfn_to_page(paddr >> PAGE_SHIFT),
157 KM_USER0);
158 offset = addr & ~PAGE_MASK;
159 guest_buf |= offset;
160 now = min(size, PAGE_SIZE - offset);
161 memcpy(host_buf, (void*)guest_buf, now);
162 host_buf += now;
163 addr += now;
164 size -= now;
165 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
166 }
167 return req_size - size;
168}
169EXPORT_SYMBOL_GPL(kvm_read_guest);
170
d27d4aca
AK		 171int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
172 void *data)
6aa8b732
AK		 173{
174 unsigned char *host_buf = data;
175 unsigned long req_size = size;
176
177 while (size) {
178 hpa_t paddr;
179 unsigned now;
180 unsigned offset;
181 hva_t guest_buf;
ab51a434 182 gfn_t gfn;
6aa8b732
AK		 183
184 paddr = gva_to_hpa(vcpu, addr);
185
186 if (is_error_hpa(paddr))
187 break;
188
ab51a434
UL		 189 gfn = vcpu->mmu.gva_to_gpa(vcpu, addr) >> PAGE_SHIFT;
190 mark_page_dirty(vcpu->kvm, gfn);
6aa8b732
AK		 191 guest_buf = (hva_t)kmap_atomic(
192 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
193 offset = addr & ~PAGE_MASK;
194 guest_buf |= offset;
195 now = min(size, PAGE_SIZE - offset);
196 memcpy((void*)guest_buf, host_buf, now);
197 host_buf += now;
198 addr += now;
199 size -= now;
200 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
201 }
202 return req_size - size;
203}
204EXPORT_SYMBOL_GPL(kvm_write_guest);
205
7702fd1f
AK		 206void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
207{
208 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
209 return;
210
211 vcpu->guest_fpu_loaded = 1;
212 fx_save(vcpu->host_fx_image);
213 fx_restore(vcpu->guest_fx_image);
214}
215EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
216
217void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
218{
219 if (!vcpu->guest_fpu_loaded)
220 return;
221
222 vcpu->guest_fpu_loaded = 0;
223 fx_save(vcpu->guest_fx_image);
224 fx_restore(vcpu->host_fx_image);
225}
226EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
227
bccf2150
AK		 228/*
229 * Switches to specified vcpu, until a matching vcpu_put()
230 */
231static void vcpu_load(struct kvm_vcpu *vcpu)
6aa8b732 232{
bccf2150
AK		 233 mutex_lock(&vcpu->mutex);
234 kvm_arch_ops->vcpu_load(vcpu);
6aa8b732
AK		 235}
236
237/*
bccf2150
AK		 238 * Switches to specified vcpu, until a matching vcpu_put(). Will return NULL
239 * if the slot is not populated.
6aa8b732 240 */
bccf2150 241static struct kvm_vcpu *vcpu_load_slot(struct kvm *kvm, int slot)
6aa8b732 242{
bccf2150 243 struct kvm_vcpu *vcpu = &kvm->vcpus[slot];
6aa8b732
AK		 244
245 mutex_lock(&vcpu->mutex);
bccf2150 246 if (!vcpu->vmcs) {
6aa8b732 247 mutex_unlock(&vcpu->mutex);
8b6d44c7 248 return NULL;
6aa8b732 249 }
bccf2150
AK		 250 kvm_arch_ops->vcpu_load(vcpu);
251 return vcpu;
6aa8b732
AK		 252}
253
254static void vcpu_put(struct kvm_vcpu *vcpu)
255{
256 kvm_arch_ops->vcpu_put(vcpu);
6aa8b732
AK		 257 mutex_unlock(&vcpu->mutex);
258}
259
d9e368d6
AK		 260static void ack_flush(void *_completed)
261{
262 atomic_t *completed = _completed;
263
264 atomic_inc(completed);
265}
266
267void kvm_flush_remote_tlbs(struct kvm *kvm)
268{
269 int i, cpu, needed;
270 cpumask_t cpus;
271 struct kvm_vcpu *vcpu;
272 atomic_t completed;
273
274 atomic_set(&completed, 0);
275 cpus_clear(cpus);
276 needed = 0;
277 for (i = 0; i < kvm->nvcpus; ++i) {
278 vcpu = &kvm->vcpus[i];
279 if (test_and_set_bit(KVM_TLB_FLUSH, &vcpu->requests))
280 continue;
281 cpu = vcpu->cpu;
282 if (cpu != -1 && cpu != raw_smp_processor_id())
283 if (!cpu_isset(cpu, cpus)) {
284 cpu_set(cpu, cpus);
285 ++needed;
286 }
287 }
288
289 /*
290 * We really want smp_call_function_mask() here. But that's not
291 * available, so ipi all cpus in parallel and wait for them
292 * to complete.
293 */
294 for (cpu = first_cpu(cpus); cpu != NR_CPUS; cpu = next_cpu(cpu, cpus))
295 smp_call_function_single(cpu, ack_flush, &completed, 1, 0);
296 while (atomic_read(&completed) != needed) {
297 cpu_relax();
298 barrier();
299 }
300}
301
f17abe9a 302static struct kvm *kvm_create_vm(void)
6aa8b732
AK		 303{
304 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
305 int i;
306
307 if (!kvm)
f17abe9a 308 return ERR_PTR(-ENOMEM);
6aa8b732 309
74906345 310 kvm_io_bus_init(&kvm->pio_bus);
6aa8b732
AK		 311 spin_lock_init(&kvm->lock);
312 INIT_LIST_HEAD(&kvm->active_mmu_pages);
120e9a45
AK		 313 spin_lock(&kvm_lock);
314 list_add(&kvm->vm_list, &vm_list);
315 spin_unlock(&kvm_lock);
2eeb2e94 316 kvm_io_bus_init(&kvm->mmio_bus);
6aa8b732
AK		 317 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
318 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
319
320 mutex_init(&vcpu->mutex);
133de902 321 vcpu->cpu = -1;
86a2b42e 322 vcpu->kvm = kvm;
6aa8b732 323 vcpu->mmu.root_hpa = INVALID_PAGE;
6aa8b732 324 }
f17abe9a
AK		 325 return kvm;
326}
327
328static int kvm_dev_open(struct inode *inode, struct file *filp)
329{
6aa8b732
AK		 330 return 0;
331}
332
333/*
334 * Free any memory in @free but not in @dont.
335 */
336static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
337 struct kvm_memory_slot *dont)
338{
339 int i;
340
341 if (!dont || free->phys_mem != dont->phys_mem)
342 if (free->phys_mem) {
343 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 344 if (free->phys_mem[i])
345 __free_page(free->phys_mem[i]);
6aa8b732
AK		 346 vfree(free->phys_mem);
347 }
348
349 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
350 vfree(free->dirty_bitmap);
351
8b6d44c7 352 free->phys_mem = NULL;
6aa8b732 353 free->npages = 0;
8b6d44c7 354 free->dirty_bitmap = NULL;
6aa8b732
AK		 355}
356
357static void kvm_free_physmem(struct kvm *kvm)
358{
359 int i;
360
361 for (i = 0; i < kvm->nmemslots; ++i)
8b6d44c7 362 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
6aa8b732
AK		 363}
364
039576c0
AK		 365static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
366{
367 int i;
368
369 for (i = 0; i < 2; ++i)
370 if (vcpu->pio.guest_pages[i]) {
371 __free_page(vcpu->pio.guest_pages[i]);
372 vcpu->pio.guest_pages[i] = NULL;
373 }
374}
375
7b53aa56
AK		 376static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
377{
378 if (!vcpu->vmcs)
379 return;
380
381 vcpu_load(vcpu);
382 kvm_mmu_unload(vcpu);
383 vcpu_put(vcpu);
384}
385
6aa8b732
AK		 386static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
387{
bccf2150 388 if (!vcpu->vmcs)
1e8ba6fb
IM		 389 return;
390
bccf2150 391 vcpu_load(vcpu);
6aa8b732 392 kvm_mmu_destroy(vcpu);
08438475 393 vcpu_put(vcpu);
9ede74e0 394 kvm_arch_ops->vcpu_free(vcpu);
9a2bb7f4
AK		 395 free_page((unsigned long)vcpu->run);
396 vcpu->run = NULL;
039576c0
AK		 397 free_page((unsigned long)vcpu->pio_data);
398 vcpu->pio_data = NULL;
399 free_pio_guest_pages(vcpu);
6aa8b732
AK		 400}
401
402static void kvm_free_vcpus(struct kvm *kvm)
403{
404 unsigned int i;
405
7b53aa56
AK		 406 /*
407 * Unpin any mmu pages first.
408 */
409 for (i = 0; i < KVM_MAX_VCPUS; ++i)
410 kvm_unload_vcpu_mmu(&kvm->vcpus[i]);
6aa8b732
AK		 411 for (i = 0; i < KVM_MAX_VCPUS; ++i)
412 kvm_free_vcpu(&kvm->vcpus[i]);
413}
414
415static int kvm_dev_release(struct inode *inode, struct file *filp)
416{
f17abe9a
AK		 417 return 0;
418}
6aa8b732 419
f17abe9a
AK		 420static void kvm_destroy_vm(struct kvm *kvm)
421{
133de902
AK		 422 spin_lock(&kvm_lock);
423 list_del(&kvm->vm_list);
424 spin_unlock(&kvm_lock);
74906345 425 kvm_io_bus_destroy(&kvm->pio_bus);
2eeb2e94 426 kvm_io_bus_destroy(&kvm->mmio_bus);
6aa8b732
AK		 427 kvm_free_vcpus(kvm);
428 kvm_free_physmem(kvm);
429 kfree(kvm);
f17abe9a
AK		 430}
431
432static int kvm_vm_release(struct inode *inode, struct file *filp)
433{
434 struct kvm *kvm = filp->private_data;
435
436 kvm_destroy_vm(kvm);
6aa8b732
AK		 437 return 0;
438}
439
440static void inject_gp(struct kvm_vcpu *vcpu)
441{
442 kvm_arch_ops->inject_gp(vcpu, 0);
443}
444
1342d353
AK		 445/*
446 * Load the pae pdptrs. Return true is they are all valid.
447 */
448static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
6aa8b732
AK		 449{
450 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
1342d353 451 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
6aa8b732
AK		 452 int i;
453 u64 pdpte;
454 u64 *pdpt;
1342d353 455 int ret;
954bbbc2 456 struct page *page;
6aa8b732
AK		 457
458 spin_lock(&vcpu->kvm->lock);
954bbbc2
AK		 459 page = gfn_to_page(vcpu->kvm, pdpt_gfn);
460 /* FIXME: !page - emulate? 0xff? */
461 pdpt = kmap_atomic(page, KM_USER0);
6aa8b732 462
1342d353 463 ret = 1;
6aa8b732
AK		 464 for (i = 0; i < 4; ++i) {
465 pdpte = pdpt[offset + i];
1342d353
AK		 466 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
467 ret = 0;
468 goto out;
469 }
6aa8b732
AK		 470 }
471
1342d353
AK		 472 for (i = 0; i < 4; ++i)
473 vcpu->pdptrs[i] = pdpt[offset + i];
474
475out:
6aa8b732
AK		 476 kunmap_atomic(pdpt, KM_USER0);
477 spin_unlock(&vcpu->kvm->lock);
478
1342d353 479 return ret;
6aa8b732
AK		 480}
481
482void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
483{
484 if (cr0 & CR0_RESEVED_BITS) {
485 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
486 cr0, vcpu->cr0);
487 inject_gp(vcpu);
488 return;
489 }
490
491 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
492 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
493 inject_gp(vcpu);
494 return;
495 }
496
497 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
498 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
499 "and a clear PE flag\n");
500 inject_gp(vcpu);
501 return;
502 }
503
504 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 505#ifdef CONFIG_X86_64
6aa8b732
AK		 506 if ((vcpu->shadow_efer & EFER_LME)) {
507 int cs_db, cs_l;
508
509 if (!is_pae(vcpu)) {
510 printk(KERN_DEBUG "set_cr0: #GP, start paging "
511 "in long mode while PAE is disabled\n");
512 inject_gp(vcpu);
513 return;
514 }
515 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
516 if (cs_l) {
517 printk(KERN_DEBUG "set_cr0: #GP, start paging "
518 "in long mode while CS.L == 1\n");
519 inject_gp(vcpu);
520 return;
521
522 }
523 } else
524#endif
1342d353 525 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 526 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
527 "reserved bits\n");
528 inject_gp(vcpu);
529 return;
530 }
531
532 }
533
534 kvm_arch_ops->set_cr0(vcpu, cr0);
535 vcpu->cr0 = cr0;
536
537 spin_lock(&vcpu->kvm->lock);
538 kvm_mmu_reset_context(vcpu);
539 spin_unlock(&vcpu->kvm->lock);
540 return;
541}
542EXPORT_SYMBOL_GPL(set_cr0);
543
544void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
545{
546 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
547}
548EXPORT_SYMBOL_GPL(lmsw);
549
550void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
551{
552 if (cr4 & CR4_RESEVED_BITS) {
553 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
554 inject_gp(vcpu);
555 return;
556 }
557
a9058ecd 558 if (is_long_mode(vcpu)) {
6aa8b732
AK		 559 if (!(cr4 & CR4_PAE_MASK)) {
560 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
561 "in long mode\n");
562 inject_gp(vcpu);
563 return;
564 }
565 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
1342d353 566 && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 567 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
568 inject_gp(vcpu);
569 }
570
571 if (cr4 & CR4_VMXE_MASK) {
572 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
573 inject_gp(vcpu);
574 return;
575 }
576 kvm_arch_ops->set_cr4(vcpu, cr4);
577 spin_lock(&vcpu->kvm->lock);
578 kvm_mmu_reset_context(vcpu);
579 spin_unlock(&vcpu->kvm->lock);
580}
581EXPORT_SYMBOL_GPL(set_cr4);
582
583void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
584{
a9058ecd 585 if (is_long_mode(vcpu)) {
d27d4aca 586 if (cr3 & CR3_L_MODE_RESEVED_BITS) {
6aa8b732
AK		 587 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
588 inject_gp(vcpu);
589 return;
590 }
591 } else {
592 if (cr3 & CR3_RESEVED_BITS) {
593 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
594 inject_gp(vcpu);
595 return;
596 }
597 if (is_paging(vcpu) && is_pae(vcpu) &&
1342d353 598 !load_pdptrs(vcpu, cr3)) {
6aa8b732
AK		 599 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
600 "reserved bits\n");
601 inject_gp(vcpu);
602 return;
603 }
604 }
605
606 vcpu->cr3 = cr3;
607 spin_lock(&vcpu->kvm->lock);
d21225ee
IM		 608 /*
609 * Does the new cr3 value map to physical memory? (Note, we
610 * catch an invalid cr3 even in real-mode, because it would
611 * cause trouble later on when we turn on paging anyway.)
612 *
613 * A real CPU would silently accept an invalid cr3 and would
614 * attempt to use it - with largely undefined (and often hard
615 * to debug) behavior on the guest side.
616 */
617 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
618 inject_gp(vcpu);
619 else
620 vcpu->mmu.new_cr3(vcpu);
6aa8b732
AK		 621 spin_unlock(&vcpu->kvm->lock);
622}
623EXPORT_SYMBOL_GPL(set_cr3);
624
625void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
626{
627 if ( cr8 & CR8_RESEVED_BITS) {
628 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
629 inject_gp(vcpu);
630 return;
631 }
632 vcpu->cr8 = cr8;
633}
634EXPORT_SYMBOL_GPL(set_cr8);
635
636void fx_init(struct kvm_vcpu *vcpu)
637{
638 struct __attribute__ ((__packed__)) fx_image_s {
639 u16 control; //fcw
640 u16 status; //fsw
641 u16 tag; // ftw
642 u16 opcode; //fop
643 u64 ip; // fpu ip
644 u64 operand;// fpu dp
645 u32 mxcsr;
646 u32 mxcsr_mask;
647
648 } *fx_image;
649
650 fx_save(vcpu->host_fx_image);
651 fpu_init();
652 fx_save(vcpu->guest_fx_image);
653 fx_restore(vcpu->host_fx_image);
654
655 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
656 fx_image->mxcsr = 0x1f80;
657 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
658 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
659}
660EXPORT_SYMBOL_GPL(fx_init);
661
02b27c1f
UL		 662static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
663{
664 spin_lock(&vcpu->kvm->lock);
665 kvm_mmu_slot_remove_write_access(vcpu, slot);
666 spin_unlock(&vcpu->kvm->lock);
667}
668
6aa8b732
AK		 669/*
670 * Allocate some memory and give it an address in the guest physical address
671 * space.
672 *
673 * Discontiguous memory is allowed, mostly for framebuffers.
674 */
2c6f5df9
AK		 675static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
676 struct kvm_memory_region *mem)
6aa8b732
AK		 677{
678 int r;
679 gfn_t base_gfn;
680 unsigned long npages;
681 unsigned long i;
682 struct kvm_memory_slot *memslot;
683 struct kvm_memory_slot old, new;
684 int memory_config_version;
685
686 r = -EINVAL;
687 /* General sanity checks */
688 if (mem->memory_size & (PAGE_SIZE - 1))
689 goto out;
690 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
691 goto out;
692 if (mem->slot >= KVM_MEMORY_SLOTS)
693 goto out;
694 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
695 goto out;
696
697 memslot = &kvm->memslots[mem->slot];
698 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
699 npages = mem->memory_size >> PAGE_SHIFT;
700
701 if (!npages)
702 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
703
704raced:
705 spin_lock(&kvm->lock);
706
707 memory_config_version = kvm->memory_config_version;
708 new = old = *memslot;
709
710 new.base_gfn = base_gfn;
711 new.npages = npages;
712 new.flags = mem->flags;
713
714 /* Disallow changing a memory slot's size. */
715 r = -EINVAL;
716 if (npages && old.npages && npages != old.npages)
717 goto out_unlock;
718
719 /* Check for overlaps */
720 r = -EEXIST;
721 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
722 struct kvm_memory_slot *s = &kvm->memslots[i];
723
724 if (s == memslot)
725 continue;
726 if (!((base_gfn + npages <= s->base_gfn) ||
727 (base_gfn >= s->base_gfn + s->npages)))
728 goto out_unlock;
729 }
730 /*
731 * Do memory allocations outside lock. memory_config_version will
732 * detect any races.
733 */
734 spin_unlock(&kvm->lock);
735
736 /* Deallocate if slot is being removed */
737 if (!npages)
8b6d44c7 738 new.phys_mem = NULL;
6aa8b732
AK		 739
740 /* Free page dirty bitmap if unneeded */
741 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
8b6d44c7 742 new.dirty_bitmap = NULL;
6aa8b732
AK		 743
744 r = -ENOMEM;
745
746 /* Allocate if a slot is being created */
747 if (npages && !new.phys_mem) {
748 new.phys_mem = vmalloc(npages * sizeof(struct page *));
749
750 if (!new.phys_mem)
751 goto out_free;
752
753 memset(new.phys_mem, 0, npages * sizeof(struct page *));
754 for (i = 0; i < npages; ++i) {
755 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
756 | __GFP_ZERO);
757 if (!new.phys_mem[i])
758 goto out_free;
5972e953 759 set_page_private(new.phys_mem[i],0);
6aa8b732
AK		 760 }
761 }
762
763 /* Allocate page dirty bitmap if needed */
764 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
765 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
766
767 new.dirty_bitmap = vmalloc(dirty_bytes);
768 if (!new.dirty_bitmap)
769 goto out_free;
770 memset(new.dirty_bitmap, 0, dirty_bytes);
771 }
772
773 spin_lock(&kvm->lock);
774
775 if (memory_config_version != kvm->memory_config_version) {
776 spin_unlock(&kvm->lock);
777 kvm_free_physmem_slot(&new, &old);
778 goto raced;
779 }
780
781 r = -EAGAIN;
782 if (kvm->busy)
783 goto out_unlock;
784
785 if (mem->slot >= kvm->nmemslots)
786 kvm->nmemslots = mem->slot + 1;
787
788 *memslot = new;
789 ++kvm->memory_config_version;
790
791 spin_unlock(&kvm->lock);
792
793 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
794 struct kvm_vcpu *vcpu;
795
bccf2150 796 vcpu = vcpu_load_slot(kvm, i);
6aa8b732
AK		 797 if (!vcpu)
798 continue;
ff990d59
UL		 799 if (new.flags & KVM_MEM_LOG_DIRTY_PAGES)
800 do_remove_write_access(vcpu, mem->slot);
6aa8b732
AK		 801 kvm_mmu_reset_context(vcpu);
802 vcpu_put(vcpu);
803 }
804
805 kvm_free_physmem_slot(&old, &new);
806 return 0;
807
808out_unlock:
809 spin_unlock(&kvm->lock);
810out_free:
811 kvm_free_physmem_slot(&new, &old);
812out:
813 return r;
814}
815
816/*
817 * Get (and clear) the dirty memory log for a memory slot.
818 */
2c6f5df9
AK		 819static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
820 struct kvm_dirty_log *log)
6aa8b732
AK		 821{
822 struct kvm_memory_slot *memslot;
823 int r, i;
824 int n;
714b93da 825 int cleared;
6aa8b732
AK		 826 unsigned long any = 0;
827
828 spin_lock(&kvm->lock);
829
830 /*
831 * Prevent changes to guest memory configuration even while the lock
832 * is not taken.
833 */
834 ++kvm->busy;
835 spin_unlock(&kvm->lock);
836 r = -EINVAL;
837 if (log->slot >= KVM_MEMORY_SLOTS)
838 goto out;
839
840 memslot = &kvm->memslots[log->slot];
841 r = -ENOENT;
842 if (!memslot->dirty_bitmap)
843 goto out;
844
cd1a4a98 845 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
6aa8b732 846
cd1a4a98 847 for (i = 0; !any && i < n/sizeof(long); ++i)
6aa8b732
AK		 848 any = memslot->dirty_bitmap[i];
849
850 r = -EFAULT;
851 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
852 goto out;
853
6aa8b732 854 if (any) {
714b93da 855 cleared = 0;
6aa8b732 856 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
bccf2150 857 struct kvm_vcpu *vcpu;
6aa8b732 858
bccf2150 859 vcpu = vcpu_load_slot(kvm, i);
6aa8b732
AK		 860 if (!vcpu)
861 continue;
714b93da
AK		 862 if (!cleared) {
863 do_remove_write_access(vcpu, log->slot);
864 memset(memslot->dirty_bitmap, 0, n);
865 cleared = 1;
866 }
6aa8b732
AK		 867 kvm_arch_ops->tlb_flush(vcpu);
868 vcpu_put(vcpu);
869 }
870 }
871
872 r = 0;
873
874out:
875 spin_lock(&kvm->lock);
876 --kvm->busy;
877 spin_unlock(&kvm->lock);
878 return r;
879}
880
e8207547
AK		 881/*
882 * Set a new alias region. Aliases map a portion of physical memory into
883 * another portion. This is useful for memory windows, for example the PC
884 * VGA region.
885 */
886static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
887 struct kvm_memory_alias *alias)
888{
889 int r, n;
890 struct kvm_mem_alias *p;
891
892 r = -EINVAL;
893 /* General sanity checks */
894 if (alias->memory_size & (PAGE_SIZE - 1))
895 goto out;
896 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
897 goto out;
898 if (alias->slot >= KVM_ALIAS_SLOTS)
899 goto out;
900 if (alias->guest_phys_addr + alias->memory_size
901 < alias->guest_phys_addr)
902 goto out;
903 if (alias->target_phys_addr + alias->memory_size
904 < alias->target_phys_addr)
905 goto out;
906
907 spin_lock(&kvm->lock);
908
909 p = &kvm->aliases[alias->slot];
910 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
911 p->npages = alias->memory_size >> PAGE_SHIFT;
912 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
913
914 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
915 if (kvm->aliases[n - 1].npages)
916 break;
917 kvm->naliases = n;
918
919 spin_unlock(&kvm->lock);
920
921 vcpu_load(&kvm->vcpus[0]);
922 spin_lock(&kvm->lock);
923 kvm_mmu_zap_all(&kvm->vcpus[0]);
924 spin_unlock(&kvm->lock);
925 vcpu_put(&kvm->vcpus[0]);
926
927 return 0;
928
929out:
930 return r;
931}
932
933static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
934{
935 int i;
936 struct kvm_mem_alias *alias;
937
938 for (i = 0; i < kvm->naliases; ++i) {
939 alias = &kvm->aliases[i];
940 if (gfn >= alias->base_gfn
941 && gfn < alias->base_gfn + alias->npages)
942 return alias->target_gfn + gfn - alias->base_gfn;
943 }
944 return gfn;
945}
946
947static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
6aa8b732
AK		 948{
949 int i;
950
951 for (i = 0; i < kvm->nmemslots; ++i) {
952 struct kvm_memory_slot *memslot = &kvm->memslots[i];
953
954 if (gfn >= memslot->base_gfn
955 && gfn < memslot->base_gfn + memslot->npages)
956 return memslot;
957 }
8b6d44c7 958 return NULL;
6aa8b732 959}
e8207547
AK		 960
961struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
962{
963 gfn = unalias_gfn(kvm, gfn);
964 return __gfn_to_memslot(kvm, gfn);
965}
6aa8b732 966
954bbbc2
AK		 967struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
968{
969 struct kvm_memory_slot *slot;
970
e8207547
AK		 971 gfn = unalias_gfn(kvm, gfn);
972 slot = __gfn_to_memslot(kvm, gfn);
954bbbc2
AK		 973 if (!slot)
974 return NULL;
975 return slot->phys_mem[gfn - slot->base_gfn];
976}
977EXPORT_SYMBOL_GPL(gfn_to_page);
978
6aa8b732
AK		 979void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
980{
981 int i;
31389947 982 struct kvm_memory_slot *memslot;
6aa8b732
AK		 983 unsigned long rel_gfn;
984
985 for (i = 0; i < kvm->nmemslots; ++i) {
986 memslot = &kvm->memslots[i];
987
988 if (gfn >= memslot->base_gfn
989 && gfn < memslot->base_gfn + memslot->npages) {
990
31389947 991 if (!memslot->dirty_bitmap)
6aa8b732
AK		 992 return;
993
994 rel_gfn = gfn - memslot->base_gfn;
995
996 /* avoid RMW */
997 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
998 set_bit(rel_gfn, memslot->dirty_bitmap);
999 return;
1000 }
1001 }
1002}
1003
1004static int emulator_read_std(unsigned long addr,
4c690a1e 1005 void *val,
6aa8b732
AK		 1006 unsigned int bytes,
1007 struct x86_emulate_ctxt *ctxt)
1008{
1009 struct kvm_vcpu *vcpu = ctxt->vcpu;
1010 void *data = val;
1011
1012 while (bytes) {
1013 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1014 unsigned offset = addr & (PAGE_SIZE-1);
1015 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1016 unsigned long pfn;
954bbbc2
AK		 1017 struct page *page;
1018 void *page_virt;
6aa8b732
AK		 1019
1020 if (gpa == UNMAPPED_GVA)
1021 return X86EMUL_PROPAGATE_FAULT;
1022 pfn = gpa >> PAGE_SHIFT;
954bbbc2
AK		 1023 page = gfn_to_page(vcpu->kvm, pfn);
1024 if (!page)
6aa8b732 1025 return X86EMUL_UNHANDLEABLE;
954bbbc2 1026 page_virt = kmap_atomic(page, KM_USER0);
6aa8b732 1027
954bbbc2 1028 memcpy(data, page_virt + offset, tocopy);
6aa8b732 1029
954bbbc2 1030 kunmap_atomic(page_virt, KM_USER0);
6aa8b732
AK		 1031
1032 bytes -= tocopy;
1033 data += tocopy;
1034 addr += tocopy;
1035 }
1036
1037 return X86EMUL_CONTINUE;
1038}
1039
1040static int emulator_write_std(unsigned long addr,
4c690a1e 1041 const void *val,
6aa8b732
AK		 1042 unsigned int bytes,
1043 struct x86_emulate_ctxt *ctxt)
1044{
1045 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
1046 addr, bytes);
1047 return X86EMUL_UNHANDLEABLE;
1048}
1049
2eeb2e94
GH		 1050static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1051 gpa_t addr)
1052{
1053 /*
1054 * Note that its important to have this wrapper function because
1055 * in the very near future we will be checking for MMIOs against
1056 * the LAPIC as well as the general MMIO bus
1057 */
1058 return kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1059}
1060
74906345
ED		 1061static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
1062 gpa_t addr)
1063{
1064 return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
1065}
1066
6aa8b732 1067static int emulator_read_emulated(unsigned long addr,
4c690a1e 1068 void *val,
6aa8b732
AK		 1069 unsigned int bytes,
1070 struct x86_emulate_ctxt *ctxt)
1071{
2eeb2e94
GH		 1072 struct kvm_vcpu *vcpu = ctxt->vcpu;
1073 struct kvm_io_device *mmio_dev;
1074 gpa_t gpa;
6aa8b732
AK		 1075
1076 if (vcpu->mmio_read_completed) {
1077 memcpy(val, vcpu->mmio_data, bytes);
1078 vcpu->mmio_read_completed = 0;
1079 return X86EMUL_CONTINUE;
1080 } else if (emulator_read_std(addr, val, bytes, ctxt)
1081 == X86EMUL_CONTINUE)
1082 return X86EMUL_CONTINUE;
d27d4aca 1083
2eeb2e94
GH		 1084 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1085 if (gpa == UNMAPPED_GVA)
1086 return X86EMUL_PROPAGATE_FAULT;
6aa8b732 1087
2eeb2e94
GH		 1088 /*
1089 * Is this MMIO handled locally?
1090 */
1091 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1092 if (mmio_dev) {
1093 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1094 return X86EMUL_CONTINUE;
6aa8b732 1095 }
2eeb2e94
GH		 1096
1097 vcpu->mmio_needed = 1;
1098 vcpu->mmio_phys_addr = gpa;
1099 vcpu->mmio_size = bytes;
1100 vcpu->mmio_is_write = 0;
1101
1102 return X86EMUL_UNHANDLEABLE;
6aa8b732
AK		 1103}
1104
da4a00f0 1105static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
4c690a1e 1106 const void *val, int bytes)
da4a00f0 1107{
da4a00f0
AK		 1108 struct page *page;
1109 void *virt;
09072daf 1110 unsigned offset = offset_in_page(gpa);
da4a00f0
AK		 1111
1112 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
1113 return 0;
954bbbc2
AK		 1114 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1115 if (!page)
da4a00f0 1116 return 0;
ab51a434 1117 mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
da4a00f0 1118 virt = kmap_atomic(page, KM_USER0);
a3c870bd
LT		 1119 if (memcmp(virt + offset_in_page(gpa), val, bytes)) {
1120 kvm_mmu_pte_write(vcpu, gpa, virt + offset, val, bytes);
1121 memcpy(virt + offset_in_page(gpa), val, bytes);
1122 }
da4a00f0 1123 kunmap_atomic(virt, KM_USER0);
da4a00f0
AK		 1124 return 1;
1125}
1126
6aa8b732 1127static int emulator_write_emulated(unsigned long addr,
4c690a1e 1128 const void *val,
6aa8b732
AK		 1129 unsigned int bytes,
1130 struct x86_emulate_ctxt *ctxt)
1131{
2eeb2e94
GH		 1132 struct kvm_vcpu *vcpu = ctxt->vcpu;
1133 struct kvm_io_device *mmio_dev;
1134 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
6aa8b732 1135
c9047f53
AK		 1136 if (gpa == UNMAPPED_GVA) {
1137 kvm_arch_ops->inject_page_fault(vcpu, addr, 2);
6aa8b732 1138 return X86EMUL_PROPAGATE_FAULT;
c9047f53 1139 }
6aa8b732 1140
da4a00f0
AK		 1141 if (emulator_write_phys(vcpu, gpa, val, bytes))
1142 return X86EMUL_CONTINUE;
1143
2eeb2e94
GH		 1144 /*
1145 * Is this MMIO handled locally?
1146 */
1147 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1148 if (mmio_dev) {
1149 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1150 return X86EMUL_CONTINUE;
1151 }
1152
6aa8b732
AK		 1153 vcpu->mmio_needed = 1;
1154 vcpu->mmio_phys_addr = gpa;
1155 vcpu->mmio_size = bytes;
1156 vcpu->mmio_is_write = 1;
4c690a1e 1157 memcpy(vcpu->mmio_data, val, bytes);
6aa8b732
AK		 1158
1159 return X86EMUL_CONTINUE;
1160}
1161
1162static int emulator_cmpxchg_emulated(unsigned long addr,
4c690a1e
AK		 1163 const void *old,
1164 const void *new,
6aa8b732
AK		 1165 unsigned int bytes,
1166 struct x86_emulate_ctxt *ctxt)
1167{
1168 static int reported;
1169
1170 if (!reported) {
1171 reported = 1;
1172 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1173 }
1174 return emulator_write_emulated(addr, new, bytes, ctxt);
1175}
1176
1177static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1178{
1179 return kvm_arch_ops->get_segment_base(vcpu, seg);
1180}
1181
1182int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1183{
6aa8b732
AK		 1184 return X86EMUL_CONTINUE;
1185}
1186
1187int emulate_clts(struct kvm_vcpu *vcpu)
1188{
399badf3 1189 unsigned long cr0;
6aa8b732 1190
399badf3 1191 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
6aa8b732
AK		 1192 kvm_arch_ops->set_cr0(vcpu, cr0);
1193 return X86EMUL_CONTINUE;
1194}
1195
1196int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1197{
1198 struct kvm_vcpu *vcpu = ctxt->vcpu;
1199
1200 switch (dr) {
1201 case 0 ... 3:
1202 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1203 return X86EMUL_CONTINUE;
1204 default:
1205 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1206 __FUNCTION__, dr);
1207 return X86EMUL_UNHANDLEABLE;
1208 }
1209}
1210
1211int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1212{
1213 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1214 int exception;
1215
1216 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1217 if (exception) {
1218 /* FIXME: better handling */
1219 return X86EMUL_UNHANDLEABLE;
1220 }
1221 return X86EMUL_CONTINUE;
1222}
1223
1224static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1225{
1226 static int reported;
1227 u8 opcodes[4];
1228 unsigned long rip = ctxt->vcpu->rip;
1229 unsigned long rip_linear;
1230
1231 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1232
1233 if (reported)
1234 return;
1235
1236 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1237
1238 printk(KERN_ERR "emulation failed but !mmio_needed?"
1239 " rip %lx %02x %02x %02x %02x\n",
1240 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1241 reported = 1;
1242}
1243
1244struct x86_emulate_ops emulate_ops = {
1245 .read_std = emulator_read_std,
1246 .write_std = emulator_write_std,
1247 .read_emulated = emulator_read_emulated,
1248 .write_emulated = emulator_write_emulated,
1249 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1250};
1251
1252int emulate_instruction(struct kvm_vcpu *vcpu,
1253 struct kvm_run *run,
1254 unsigned long cr2,
1255 u16 error_code)
1256{
1257 struct x86_emulate_ctxt emulate_ctxt;
1258 int r;
1259 int cs_db, cs_l;
1260
e7df56e4 1261 vcpu->mmio_fault_cr2 = cr2;
6aa8b732
AK		 1262 kvm_arch_ops->cache_regs(vcpu);
1263
1264 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1265
1266 emulate_ctxt.vcpu = vcpu;
1267 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1268 emulate_ctxt.cr2 = cr2;
1269 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1270 ? X86EMUL_MODE_REAL : cs_l
1271 ? X86EMUL_MODE_PROT64 : cs_db
1272 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1273
1274 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1275 emulate_ctxt.cs_base = 0;
1276 emulate_ctxt.ds_base = 0;
1277 emulate_ctxt.es_base = 0;
1278 emulate_ctxt.ss_base = 0;
1279 } else {
1280 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1281 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1282 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1283 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1284 }
1285
1286 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1287 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1288
1289 vcpu->mmio_is_write = 0;
1290 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1291
1292 if ((r || vcpu->mmio_is_write) && run) {
1293 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1294 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1295 run->mmio.len = vcpu->mmio_size;
1296 run->mmio.is_write = vcpu->mmio_is_write;
1297 }
1298
1299 if (r) {
a436036b
AK		 1300 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1301 return EMULATE_DONE;
6aa8b732
AK		 1302 if (!vcpu->mmio_needed) {
1303 report_emulation_failure(&emulate_ctxt);
1304 return EMULATE_FAIL;
1305 }
1306 return EMULATE_DO_MMIO;
1307 }
1308
1309 kvm_arch_ops->decache_regs(vcpu);
1310 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1311
02c83209
AK		 1312 if (vcpu->mmio_is_write) {
1313 vcpu->mmio_needed = 0;
6aa8b732 1314 return EMULATE_DO_MMIO;
02c83209 1315 }
6aa8b732
AK		 1316
1317 return EMULATE_DONE;
1318}
1319EXPORT_SYMBOL_GPL(emulate_instruction);
1320
d3bef15f
AK		 1321int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1322{
1323 if (vcpu->irq_summary)
1324 return 1;
1325
1326 vcpu->run->exit_reason = KVM_EXIT_HLT;
1327 ++vcpu->stat.halt_exits;
1328 return 0;
1329}
1330EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1331
270fd9b9
AK		 1332int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1333{
1334 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1335
9b22bf57 1336 kvm_arch_ops->cache_regs(vcpu);
270fd9b9
AK		 1337 ret = -KVM_EINVAL;
1338#ifdef CONFIG_X86_64
1339 if (is_long_mode(vcpu)) {
1340 nr = vcpu->regs[VCPU_REGS_RAX];
1341 a0 = vcpu->regs[VCPU_REGS_RDI];
1342 a1 = vcpu->regs[VCPU_REGS_RSI];
1343 a2 = vcpu->regs[VCPU_REGS_RDX];
1344 a3 = vcpu->regs[VCPU_REGS_RCX];
1345 a4 = vcpu->regs[VCPU_REGS_R8];
1346 a5 = vcpu->regs[VCPU_REGS_R9];
1347 } else
1348#endif
1349 {
1350 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1351 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1352 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1353 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1354 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1355 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1356 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1357 }
1358 switch (nr) {
1359 default:
b4e63f56
AK		 1360 run->hypercall.args[0] = a0;
1361 run->hypercall.args[1] = a1;
1362 run->hypercall.args[2] = a2;
1363 run->hypercall.args[3] = a3;
1364 run->hypercall.args[4] = a4;
1365 run->hypercall.args[5] = a5;
1366 run->hypercall.ret = ret;
1367 run->hypercall.longmode = is_long_mode(vcpu);
1368 kvm_arch_ops->decache_regs(vcpu);
1369 return 0;
270fd9b9
AK		 1370 }
1371 vcpu->regs[VCPU_REGS_RAX] = ret;
9b22bf57 1372 kvm_arch_ops->decache_regs(vcpu);
270fd9b9
AK		 1373 return 1;
1374}
1375EXPORT_SYMBOL_GPL(kvm_hypercall);
1376
6aa8b732
AK		 1377static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1378{
1379 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1380}
1381
1382void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1383{
1384 struct descriptor_table dt = { limit, base };
1385
1386 kvm_arch_ops->set_gdt(vcpu, &dt);
1387}
1388
1389void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1390{
1391 struct descriptor_table dt = { limit, base };
1392
1393 kvm_arch_ops->set_idt(vcpu, &dt);
1394}
1395
1396void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1397 unsigned long *rflags)
1398{
1399 lmsw(vcpu, msw);
1400 *rflags = kvm_arch_ops->get_rflags(vcpu);
1401}
1402
1403unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1404{
25c4c276 1405 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 1406 switch (cr) {
1407 case 0:
1408 return vcpu->cr0;
1409 case 2:
1410 return vcpu->cr2;
1411 case 3:
1412 return vcpu->cr3;
1413 case 4:
1414 return vcpu->cr4;
1415 default:
1416 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1417 return 0;
1418 }
1419}
1420
1421void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1422 unsigned long *rflags)
1423{
1424 switch (cr) {
1425 case 0:
1426 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1427 *rflags = kvm_arch_ops->get_rflags(vcpu);
1428 break;
1429 case 2:
1430 vcpu->cr2 = val;
1431 break;
1432 case 3:
1433 set_cr3(vcpu, val);
1434 break;
1435 case 4:
1436 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1437 break;
1438 default:
1439 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1440 }
1441}
1442
102d8325
IM		 1443/*
1444 * Register the para guest with the host:
1445 */
1446static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1447{
1448 struct kvm_vcpu_para_state *para_state;
1449 hpa_t para_state_hpa, hypercall_hpa;
1450 struct page *para_state_page;
1451 unsigned char *hypercall;
1452 gpa_t hypercall_gpa;
1453
1454 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1455 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1456
1457 /*
1458 * Needs to be page aligned:
1459 */
1460 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1461 goto err_gp;
1462
1463 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1464 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1465 if (is_error_hpa(para_state_hpa))
1466 goto err_gp;
1467
ab51a434 1468 mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
102d8325
IM		 1469 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1470 para_state = kmap_atomic(para_state_page, KM_USER0);
1471
1472 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1473 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1474
1475 para_state->host_version = KVM_PARA_API_VERSION;
1476 /*
1477 * We cannot support guests that try to register themselves
1478 * with a newer API version than the host supports:
1479 */
1480 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1481 para_state->ret = -KVM_EINVAL;
1482 goto err_kunmap_skip;
1483 }
1484
1485 hypercall_gpa = para_state->hypercall_gpa;
1486 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1487 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1488 if (is_error_hpa(hypercall_hpa)) {
1489 para_state->ret = -KVM_EINVAL;
1490 goto err_kunmap_skip;
1491 }
1492
1493 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1494 vcpu->para_state_page = para_state_page;
1495 vcpu->para_state_gpa = para_state_gpa;
1496 vcpu->hypercall_gpa = hypercall_gpa;
1497
ab51a434 1498 mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
102d8325
IM		 1499 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1500 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1501 kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1502 kunmap_atomic(hypercall, KM_USER1);
1503
1504 para_state->ret = 0;
1505err_kunmap_skip:
1506 kunmap_atomic(para_state, KM_USER0);
1507 return 0;
1508err_gp:
1509 return 1;
1510}
1511
3bab1f5d
AK		 1512int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1513{
1514 u64 data;
1515
1516 switch (msr) {
1517 case 0xc0010010: /* SYSCFG */
1518 case 0xc0010015: /* HWCR */
1519 case MSR_IA32_PLATFORM_ID:
1520 case MSR_IA32_P5_MC_ADDR:
1521 case MSR_IA32_P5_MC_TYPE:
1522 case MSR_IA32_MC0_CTL:
1523 case MSR_IA32_MCG_STATUS:
1524 case MSR_IA32_MCG_CAP:
1525 case MSR_IA32_MC0_MISC:
1526 case MSR_IA32_MC0_MISC+4:
1527 case MSR_IA32_MC0_MISC+8:
1528 case MSR_IA32_MC0_MISC+12:
1529 case MSR_IA32_MC0_MISC+16:
1530 case MSR_IA32_UCODE_REV:
a8d13ea2 1531 case MSR_IA32_PERF_STATUS:
2dc7094b 1532 case MSR_IA32_EBL_CR_POWERON:
3bab1f5d
AK		 1533 /* MTRR registers */
1534 case 0xfe:
1535 case 0x200 ... 0x2ff:
1536 data = 0;
1537 break;
a8d13ea2
AK		 1538 case 0xcd: /* fsb frequency */
1539 data = 3;
1540 break;
3bab1f5d
AK		 1541 case MSR_IA32_APICBASE:
1542 data = vcpu->apic_base;
1543 break;
6f00e68f
AK		 1544 case MSR_IA32_MISC_ENABLE:
1545 data = vcpu->ia32_misc_enable_msr;
1546 break;
3bab1f5d
AK		 1547#ifdef CONFIG_X86_64
1548 case MSR_EFER:
1549 data = vcpu->shadow_efer;
1550 break;
1551#endif
1552 default:
1553 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1554 return 1;
1555 }
1556 *pdata = data;
1557 return 0;
1558}
1559EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1560
6aa8b732
AK		 1561/*
1562 * Reads an msr value (of 'msr_index') into 'pdata'.
1563 * Returns 0 on success, non-0 otherwise.
1564 * Assumes vcpu_load() was already called.
1565 */
1566static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1567{
1568 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1569}
1570
05b3e0c2 1571#ifdef CONFIG_X86_64
6aa8b732 1572
3bab1f5d 1573static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1574{
6aa8b732
AK		 1575 if (efer & EFER_RESERVED_BITS) {
1576 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1577 efer);
1578 inject_gp(vcpu);
1579 return;
1580 }
1581
1582 if (is_paging(vcpu)
1583 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1584 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1585 inject_gp(vcpu);
1586 return;
1587 }
1588
7725f0ba
AK		 1589 kvm_arch_ops->set_efer(vcpu, efer);
1590
6aa8b732
AK		 1591 efer &= ~EFER_LMA;
1592 efer |= vcpu->shadow_efer & EFER_LMA;
1593
1594 vcpu->shadow_efer = efer;
6aa8b732 1595}
6aa8b732
AK		 1596
1597#endif
1598
3bab1f5d
AK		 1599int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1600{
1601 switch (msr) {
1602#ifdef CONFIG_X86_64
1603 case MSR_EFER:
1604 set_efer(vcpu, data);
1605 break;
1606#endif
1607 case MSR_IA32_MC0_STATUS:
1608 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1609 __FUNCTION__, data);
1610 break;
0e5bf0d0
SK		 1611 case MSR_IA32_MCG_STATUS:
1612 printk(KERN_WARNING "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
1613 __FUNCTION__, data);
1614 break;
3bab1f5d
AK		 1615 case MSR_IA32_UCODE_REV:
1616 case MSR_IA32_UCODE_WRITE:
1617 case 0x200 ... 0x2ff: /* MTRRs */
1618 break;
1619 case MSR_IA32_APICBASE:
1620 vcpu->apic_base = data;
1621 break;
6f00e68f
AK		 1622 case MSR_IA32_MISC_ENABLE:
1623 vcpu->ia32_misc_enable_msr = data;
1624 break;
102d8325
IM		 1625 /*
1626 * This is the 'probe whether the host is KVM' logic:
1627 */
1628 case MSR_KVM_API_MAGIC:
1629 return vcpu_register_para(vcpu, data);
1630
3bab1f5d
AK		 1631 default:
1632 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1633 return 1;
1634 }
1635 return 0;
1636}
1637EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1638
6aa8b732
AK		 1639/*
1640 * Writes msr value into into the appropriate "register".
1641 * Returns 0 on success, non-0 otherwise.
1642 * Assumes vcpu_load() was already called.
1643 */
1644static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1645{
1646 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1647}
1648
1649void kvm_resched(struct kvm_vcpu *vcpu)
1650{
3fca0365
YD		 1651 if (!need_resched())
1652 return;
6aa8b732
AK		 1653 vcpu_put(vcpu);
1654 cond_resched();
bccf2150 1655 vcpu_load(vcpu);
6aa8b732
AK		 1656}
1657EXPORT_SYMBOL_GPL(kvm_resched);
1658
1659void load_msrs(struct vmx_msr_entry *e, int n)
1660{
1661 int i;
1662
1663 for (i = 0; i < n; ++i)
1664 wrmsrl(e[i].index, e[i].data);
1665}
1666EXPORT_SYMBOL_GPL(load_msrs);
1667
1668void save_msrs(struct vmx_msr_entry *e, int n)
1669{
1670 int i;
1671
1672 for (i = 0; i < n; ++i)
1673 rdmsrl(e[i].index, e[i].data);
1674}
1675EXPORT_SYMBOL_GPL(save_msrs);
1676
06465c5a
AK		 1677void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1678{
1679 int i;
1680 u32 function;
1681 struct kvm_cpuid_entry *e, *best;
1682
1683 kvm_arch_ops->cache_regs(vcpu);
1684 function = vcpu->regs[VCPU_REGS_RAX];
1685 vcpu->regs[VCPU_REGS_RAX] = 0;
1686 vcpu->regs[VCPU_REGS_RBX] = 0;
1687 vcpu->regs[VCPU_REGS_RCX] = 0;
1688 vcpu->regs[VCPU_REGS_RDX] = 0;
1689 best = NULL;
1690 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1691 e = &vcpu->cpuid_entries[i];
1692 if (e->function == function) {
1693 best = e;
1694 break;
1695 }
1696 /*
1697 * Both basic or both extended?
1698 */
1699 if (((e->function ^ function) & 0x80000000) == 0)
1700 if (!best || e->function > best->function)
1701 best = e;
1702 }
1703 if (best) {
1704 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1705 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1706 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1707 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1708 }
1709 kvm_arch_ops->decache_regs(vcpu);
1710 kvm_arch_ops->skip_emulated_instruction(vcpu);
1711}
1712EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1713
039576c0 1714static int pio_copy_data(struct kvm_vcpu *vcpu)
46fc1477 1715{
039576c0
AK		 1716 void *p = vcpu->pio_data;
1717 void *q;
1718 unsigned bytes;
1719 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1720
1721 kvm_arch_ops->vcpu_put(vcpu);
1722 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1723 PAGE_KERNEL);
1724 if (!q) {
1725 kvm_arch_ops->vcpu_load(vcpu);
1726 free_pio_guest_pages(vcpu);
1727 return -ENOMEM;
1728 }
1729 q += vcpu->pio.guest_page_offset;
1730 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1731 if (vcpu->pio.in)
1732 memcpy(q, p, bytes);
1733 else
1734 memcpy(p, q, bytes);
1735 q -= vcpu->pio.guest_page_offset;
1736 vunmap(q);
1737 kvm_arch_ops->vcpu_load(vcpu);
1738 free_pio_guest_pages(vcpu);
1739 return 0;
1740}
1741
1742static int complete_pio(struct kvm_vcpu *vcpu)
1743{
1744 struct kvm_pio_request *io = &vcpu->pio;
46fc1477 1745 long delta;
039576c0 1746 int r;
46fc1477
AK		 1747
1748 kvm_arch_ops->cache_regs(vcpu);
1749
1750 if (!io->string) {
039576c0
AK		 1751 if (io->in)
1752 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
46fc1477
AK		 1753 io->size);
1754 } else {
039576c0
AK		 1755 if (io->in) {
1756 r = pio_copy_data(vcpu);
1757 if (r) {
1758 kvm_arch_ops->cache_regs(vcpu);
1759 return r;
1760 }
1761 }
1762
46fc1477
AK		 1763 delta = 1;
1764 if (io->rep) {
039576c0 1765 delta *= io->cur_count;
46fc1477
AK		 1766 /*
1767 * The size of the register should really depend on
1768 * current address size.
1769 */
1770 vcpu->regs[VCPU_REGS_RCX] -= delta;
1771 }
039576c0 1772 if (io->down)
46fc1477
AK		 1773 delta = -delta;
1774 delta *= io->size;
039576c0 1775 if (io->in)
46fc1477
AK		 1776 vcpu->regs[VCPU_REGS_RDI] += delta;
1777 else
1778 vcpu->regs[VCPU_REGS_RSI] += delta;
1779 }
1780
46fc1477
AK		 1781 kvm_arch_ops->decache_regs(vcpu);
1782
039576c0
AK		 1783 io->count -= io->cur_count;
1784 io->cur_count = 0;
1785
1786 if (!io->count)
1787 kvm_arch_ops->skip_emulated_instruction(vcpu);
1788 return 0;
46fc1477
AK		 1789}
1790
74906345
ED		 1791void kernel_pio(struct kvm_io_device *pio_dev, struct kvm_vcpu *vcpu)
1792{
1793 /* TODO: String I/O for in kernel device */
1794
1795 if (vcpu->pio.in)
1796 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1797 vcpu->pio.size,
1798 vcpu->pio_data);
1799 else
1800 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1801 vcpu->pio.size,
1802 vcpu->pio_data);
1803}
1804
039576c0
AK		 1805int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1806 int size, unsigned long count, int string, int down,
1807 gva_t address, int rep, unsigned port)
1808{
1809 unsigned now, in_page;
1810 int i;
1811 int nr_pages = 1;
1812 struct page *page;
74906345 1813 struct kvm_io_device *pio_dev;
039576c0
AK		 1814
1815 vcpu->run->exit_reason = KVM_EXIT_IO;
1816 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1817 vcpu->run->io.size = size;
1818 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1819 vcpu->run->io.count = count;
1820 vcpu->run->io.port = port;
1821 vcpu->pio.count = count;
1822 vcpu->pio.cur_count = count;
1823 vcpu->pio.size = size;
1824 vcpu->pio.in = in;
74906345 1825 vcpu->pio.port = port;
039576c0
AK		 1826 vcpu->pio.string = string;
1827 vcpu->pio.down = down;
1828 vcpu->pio.guest_page_offset = offset_in_page(address);
1829 vcpu->pio.rep = rep;
1830
74906345 1831 pio_dev = vcpu_find_pio_dev(vcpu, port);
039576c0
AK		 1832 if (!string) {
1833 kvm_arch_ops->cache_regs(vcpu);
1834 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1835 kvm_arch_ops->decache_regs(vcpu);
74906345
ED		 1836 if (pio_dev) {
1837 kernel_pio(pio_dev, vcpu);
1838 complete_pio(vcpu);
1839 return 1;
1840 }
039576c0
AK		 1841 return 0;
1842 }
74906345
ED		 1843 /* TODO: String I/O for in kernel device */
1844 if (pio_dev)
1845 printk(KERN_ERR "kvm_setup_pio: no string io support\n");
039576c0
AK		 1846
1847 if (!count) {
1848 kvm_arch_ops->skip_emulated_instruction(vcpu);
1849 return 1;
1850 }
1851
1852 now = min(count, PAGE_SIZE / size);
1853
1854 if (!down)
1855 in_page = PAGE_SIZE - offset_in_page(address);
1856 else
1857 in_page = offset_in_page(address) + size;
1858 now = min(count, (unsigned long)in_page / size);
1859 if (!now) {
1860 /*
1861 * String I/O straddles page boundary. Pin two guest pages
1862 * so that we satisfy atomicity constraints. Do just one
1863 * transaction to avoid complexity.
1864 */
1865 nr_pages = 2;
1866 now = 1;
1867 }
1868 if (down) {
1869 /*
1870 * String I/O in reverse. Yuck. Kill the guest, fix later.
1871 */
1872 printk(KERN_ERR "kvm: guest string pio down\n");
1873 inject_gp(vcpu);
1874 return 1;
1875 }
1876 vcpu->run->io.count = now;
1877 vcpu->pio.cur_count = now;
1878
1879 for (i = 0; i < nr_pages; ++i) {
1880 spin_lock(&vcpu->kvm->lock);
1881 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1882 if (page)
1883 get_page(page);
1884 vcpu->pio.guest_pages[i] = page;
1885 spin_unlock(&vcpu->kvm->lock);
1886 if (!page) {
1887 inject_gp(vcpu);
1888 free_pio_guest_pages(vcpu);
1889 return 1;
1890 }
1891 }
1892
1893 if (!vcpu->pio.in)
1894 return pio_copy_data(vcpu);
1895 return 0;
1896}
1897EXPORT_SYMBOL_GPL(kvm_setup_pio);
1898
bccf2150 1899static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
6aa8b732 1900{
6aa8b732 1901 int r;
1961d276 1902 sigset_t sigsaved;
6aa8b732 1903
bccf2150 1904 vcpu_load(vcpu);
6aa8b732 1905
1961d276
AK		 1906 if (vcpu->sigset_active)
1907 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
1908
54810342
DL		 1909 /* re-sync apic's tpr */
1910 vcpu->cr8 = kvm_run->cr8;
1911
02c83209
AK		 1912 if (vcpu->pio.cur_count) {
1913 r = complete_pio(vcpu);
1914 if (r)
1915 goto out;
1916 }
1917
1918 if (vcpu->mmio_needed) {
1919 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1920 vcpu->mmio_read_completed = 1;
1921 vcpu->mmio_needed = 0;
1922 r = emulate_instruction(vcpu, kvm_run,
1923 vcpu->mmio_fault_cr2, 0);
1924 if (r == EMULATE_DO_MMIO) {
1925 /*
1926 * Read-modify-write. Back to userspace.
1927 */
1928 kvm_run->exit_reason = KVM_EXIT_MMIO;
1929 r = 0;
1930 goto out;
46fc1477 1931 }
6aa8b732
AK		 1932 }
1933
8eb7d334 1934 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
b4e63f56
AK		 1935 kvm_arch_ops->cache_regs(vcpu);
1936 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
1937 kvm_arch_ops->decache_regs(vcpu);
1938 }
1939
6aa8b732
AK		 1940 r = kvm_arch_ops->run(vcpu, kvm_run);
1941
039576c0 1942out:
1961d276
AK		 1943 if (vcpu->sigset_active)
1944 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1945
6aa8b732
AK		 1946 vcpu_put(vcpu);
1947 return r;
1948}
1949
bccf2150
AK		 1950static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
1951 struct kvm_regs *regs)
6aa8b732 1952{
bccf2150 1953 vcpu_load(vcpu);
6aa8b732
AK		 1954
1955 kvm_arch_ops->cache_regs(vcpu);
1956
1957 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1958 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1959 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1960 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1961 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1962 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1963 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1964 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1965#ifdef CONFIG_X86_64
6aa8b732
AK		 1966 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1967 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1968 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1969 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1970 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1971 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1972 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1973 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1974#endif
1975
1976 regs->rip = vcpu->rip;
1977 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1978
1979 /*
1980 * Don't leak debug flags in case they were set for guest debugging
1981 */
1982 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1983 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1984
1985 vcpu_put(vcpu);
1986
1987 return 0;
1988}
1989
bccf2150
AK		 1990static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
1991 struct kvm_regs *regs)
6aa8b732 1992{
bccf2150 1993 vcpu_load(vcpu);
6aa8b732
AK		 1994
1995 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1996 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1997 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1998 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1999 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
2000 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
2001 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
2002 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 2003#ifdef CONFIG_X86_64
6aa8b732
AK		 2004 vcpu->regs[VCPU_REGS_R8] = regs->r8;
2005 vcpu->regs[VCPU_REGS_R9] = regs->r9;
2006 vcpu->regs[VCPU_REGS_R10] = regs->r10;
2007 vcpu->regs[VCPU_REGS_R11] = regs->r11;
2008 vcpu->regs[VCPU_REGS_R12] = regs->r12;
2009 vcpu->regs[VCPU_REGS_R13] = regs->r13;
2010 vcpu->regs[VCPU_REGS_R14] = regs->r14;
2011 vcpu->regs[VCPU_REGS_R15] = regs->r15;
2012#endif
2013
2014 vcpu->rip = regs->rip;
2015 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
2016
2017 kvm_arch_ops->decache_regs(vcpu);
2018
2019 vcpu_put(vcpu);
2020
2021 return 0;
2022}
2023
2024static void get_segment(struct kvm_vcpu *vcpu,
2025 struct kvm_segment *var, int seg)
2026{
2027 return kvm_arch_ops->get_segment(vcpu, var, seg);
2028}
2029
bccf2150
AK		 2030static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2031 struct kvm_sregs *sregs)
6aa8b732 2032{
6aa8b732
AK		 2033 struct descriptor_table dt;
2034
bccf2150 2035 vcpu_load(vcpu);
6aa8b732
AK		 2036
2037 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2038 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2039 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2040 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2041 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2042 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2043
2044 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2045 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2046
2047 kvm_arch_ops->get_idt(vcpu, &dt);
2048 sregs->idt.limit = dt.limit;
2049 sregs->idt.base = dt.base;
2050 kvm_arch_ops->get_gdt(vcpu, &dt);
2051 sregs->gdt.limit = dt.limit;
2052 sregs->gdt.base = dt.base;
2053
25c4c276 2054 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 2055 sregs->cr0 = vcpu->cr0;
2056 sregs->cr2 = vcpu->cr2;
2057 sregs->cr3 = vcpu->cr3;
2058 sregs->cr4 = vcpu->cr4;
2059 sregs->cr8 = vcpu->cr8;
2060 sregs->efer = vcpu->shadow_efer;
2061 sregs->apic_base = vcpu->apic_base;
2062
2063 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2064 sizeof sregs->interrupt_bitmap);
2065
2066 vcpu_put(vcpu);
2067
2068 return 0;
2069}
2070
2071static void set_segment(struct kvm_vcpu *vcpu,
2072 struct kvm_segment *var, int seg)
2073{
2074 return kvm_arch_ops->set_segment(vcpu, var, seg);
2075}
2076
bccf2150
AK		 2077static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2078 struct kvm_sregs *sregs)
6aa8b732 2079{
6aa8b732
AK		 2080 int mmu_reset_needed = 0;
2081 int i;
2082 struct descriptor_table dt;
2083
bccf2150 2084 vcpu_load(vcpu);
6aa8b732 2085
6aa8b732
AK		 2086 dt.limit = sregs->idt.limit;
2087 dt.base = sregs->idt.base;
2088 kvm_arch_ops->set_idt(vcpu, &dt);
2089 dt.limit = sregs->gdt.limit;
2090 dt.base = sregs->gdt.base;
2091 kvm_arch_ops->set_gdt(vcpu, &dt);
2092
2093 vcpu->cr2 = sregs->cr2;
2094 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2095 vcpu->cr3 = sregs->cr3;
2096
2097 vcpu->cr8 = sregs->cr8;
2098
2099 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 2100#ifdef CONFIG_X86_64
6aa8b732
AK		 2101 kvm_arch_ops->set_efer(vcpu, sregs->efer);
2102#endif
2103 vcpu->apic_base = sregs->apic_base;
2104
25c4c276 2105 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
399badf3 2106
6aa8b732 2107 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
f6528b03 2108 kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
6aa8b732
AK		 2109
2110 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2111 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 2112 if (!is_long_mode(vcpu) && is_pae(vcpu))
2113 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 2114
2115 if (mmu_reset_needed)
2116 kvm_mmu_reset_context(vcpu);
2117
2118 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2119 sizeof vcpu->irq_pending);
2120 vcpu->irq_summary = 0;
2121 for (i = 0; i < NR_IRQ_WORDS; ++i)
2122 if (vcpu->irq_pending[i])
2123 __set_bit(i, &vcpu->irq_summary);
2124
024aa1c0
AK		 2125 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2126 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2127 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2128 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2129 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2130 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2131
2132 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2133 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2134
6aa8b732
AK		 2135 vcpu_put(vcpu);
2136
2137 return 0;
2138}
2139
2140/*
2141 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2142 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 2143 *
2144 * This list is modified at module load time to reflect the
2145 * capabilities of the host cpu.
6aa8b732
AK		 2146 */
2147static u32 msrs_to_save[] = {
2148 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2149 MSR_K6_STAR,
05b3e0c2 2150#ifdef CONFIG_X86_64
6aa8b732
AK		 2151 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2152#endif
2153 MSR_IA32_TIME_STAMP_COUNTER,
2154};
2155
bf591b24
MR		 2156static unsigned num_msrs_to_save;
2157
6f00e68f
AK		 2158static u32 emulated_msrs[] = {
2159 MSR_IA32_MISC_ENABLE,
2160};
2161
bf591b24
MR		 2162static __init void kvm_init_msr_list(void)
2163{
2164 u32 dummy[2];
2165 unsigned i, j;
2166
2167 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2168 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2169 continue;
2170 if (j < i)
2171 msrs_to_save[j] = msrs_to_save[i];
2172 j++;
2173 }
2174 num_msrs_to_save = j;
2175}
6aa8b732
AK		 2176
2177/*
2178 * Adapt set_msr() to msr_io()'s calling convention
2179 */
2180static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2181{
2182 return set_msr(vcpu, index, *data);
2183}
2184
2185/*
2186 * Read or write a bunch of msrs. All parameters are kernel addresses.
2187 *
2188 * @return number of msrs set successfully.
2189 */
bccf2150 2190static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
6aa8b732
AK		 2191 struct kvm_msr_entry *entries,
2192 int (*do_msr)(struct kvm_vcpu *vcpu,
2193 unsigned index, u64 *data))
2194{
6aa8b732
AK		 2195 int i;
2196
bccf2150 2197 vcpu_load(vcpu);
6aa8b732
AK		 2198
2199 for (i = 0; i < msrs->nmsrs; ++i)
2200 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2201 break;
2202
2203 vcpu_put(vcpu);
2204
2205 return i;
2206}
2207
2208/*
2209 * Read or write a bunch of msrs. Parameters are user addresses.
2210 *
2211 * @return number of msrs set successfully.
2212 */
bccf2150 2213static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
6aa8b732
AK		 2214 int (*do_msr)(struct kvm_vcpu *vcpu,
2215 unsigned index, u64 *data),
2216 int writeback)
2217{
2218 struct kvm_msrs msrs;
2219 struct kvm_msr_entry *entries;
2220 int r, n;
2221 unsigned size;
2222
2223 r = -EFAULT;
2224 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2225 goto out;
2226
2227 r = -E2BIG;
2228 if (msrs.nmsrs >= MAX_IO_MSRS)
2229 goto out;
2230
2231 r = -ENOMEM;
2232 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2233 entries = vmalloc(size);
2234 if (!entries)
2235 goto out;
2236
2237 r = -EFAULT;
2238 if (copy_from_user(entries, user_msrs->entries, size))
2239 goto out_free;
2240
bccf2150 2241 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
6aa8b732
AK		 2242 if (r < 0)
2243 goto out_free;
2244
2245 r = -EFAULT;
2246 if (writeback && copy_to_user(user_msrs->entries, entries, size))
2247 goto out_free;
2248
2249 r = n;
2250
2251out_free:
2252 vfree(entries);
2253out:
2254 return r;
2255}
2256
2257/*
2258 * Translate a guest virtual address to a guest physical address.
2259 */
bccf2150
AK		 2260static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2261 struct kvm_translation *tr)
6aa8b732
AK		 2262{
2263 unsigned long vaddr = tr->linear_address;
6aa8b732
AK		 2264 gpa_t gpa;
2265
bccf2150
AK		 2266 vcpu_load(vcpu);
2267 spin_lock(&vcpu->kvm->lock);
6aa8b732
AK		 2268 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2269 tr->physical_address = gpa;
2270 tr->valid = gpa != UNMAPPED_GVA;
2271 tr->writeable = 1;
2272 tr->usermode = 0;
bccf2150 2273 spin_unlock(&vcpu->kvm->lock);
6aa8b732
AK		 2274 vcpu_put(vcpu);
2275
2276 return 0;
2277}
2278
bccf2150
AK		 2279static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2280 struct kvm_interrupt *irq)
6aa8b732 2281{
6aa8b732
AK		 2282 if (irq->irq < 0 || irq->irq >= 256)
2283 return -EINVAL;
bccf2150 2284 vcpu_load(vcpu);
6aa8b732
AK		 2285
2286 set_bit(irq->irq, vcpu->irq_pending);
2287 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2288
2289 vcpu_put(vcpu);
2290
2291 return 0;
2292}
2293
bccf2150
AK		 2294static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2295 struct kvm_debug_guest *dbg)
6aa8b732 2296{
6aa8b732
AK		 2297 int r;
2298
bccf2150 2299 vcpu_load(vcpu);
6aa8b732
AK		 2300
2301 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
2302
2303 vcpu_put(vcpu);
2304
2305 return r;
2306}
2307
9a2bb7f4
AK		 2308static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2309 unsigned long address,
2310 int *type)
2311{
2312 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2313 unsigned long pgoff;
2314 struct page *page;
2315
2316 *type = VM_FAULT_MINOR;
2317 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
039576c0
AK		 2318 if (pgoff == 0)
2319 page = virt_to_page(vcpu->run);
2320 else if (pgoff == KVM_PIO_PAGE_OFFSET)
2321 page = virt_to_page(vcpu->pio_data);
2322 else
9a2bb7f4 2323 return NOPAGE_SIGBUS;
9a2bb7f4
AK		 2324 get_page(page);
2325 return page;
2326}
2327
2328static struct vm_operations_struct kvm_vcpu_vm_ops = {
2329 .nopage = kvm_vcpu_nopage,
2330};
2331
2332static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2333{
2334 vma->vm_ops = &kvm_vcpu_vm_ops;
2335 return 0;
2336}
2337
bccf2150
AK		 2338static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2339{
2340 struct kvm_vcpu *vcpu = filp->private_data;
2341
2342 fput(vcpu->kvm->filp);
2343 return 0;
2344}
2345
2346static struct file_operations kvm_vcpu_fops = {
2347 .release = kvm_vcpu_release,
2348 .unlocked_ioctl = kvm_vcpu_ioctl,
2349 .compat_ioctl = kvm_vcpu_ioctl,
9a2bb7f4 2350 .mmap = kvm_vcpu_mmap,
bccf2150
AK		 2351};
2352
2353/*
2354 * Allocates an inode for the vcpu.
2355 */
2356static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2357{
2358 int fd, r;
2359 struct inode *inode;
2360 struct file *file;
2361
d6d28168
AK		 2362 r = anon_inode_getfd(&fd, &inode, &file,
2363 "kvm-vcpu", &kvm_vcpu_fops, vcpu);
2364 if (r)
2365 return r;
bccf2150 2366 atomic_inc(&vcpu->kvm->filp->f_count);
bccf2150 2367 return fd;
bccf2150
AK		 2368}
2369
c5ea7660
AK		 2370/*
2371 * Creates some virtual cpus. Good luck creating more than one.
2372 */
2373static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2374{
2375 int r;
2376 struct kvm_vcpu *vcpu;
9a2bb7f4 2377 struct page *page;
c5ea7660
AK		 2378
2379 r = -EINVAL;
2380 if (!valid_vcpu(n))
2381 goto out;
2382
2383 vcpu = &kvm->vcpus[n];
2384
2385 mutex_lock(&vcpu->mutex);
2386
2387 if (vcpu->vmcs) {
2388 mutex_unlock(&vcpu->mutex);
2389 return -EEXIST;
2390 }
2391
9a2bb7f4
AK		 2392 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2393 r = -ENOMEM;
2394 if (!page)
2395 goto out_unlock;
2396 vcpu->run = page_address(page);
2397
039576c0
AK		 2398 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2399 r = -ENOMEM;
2400 if (!page)
2401 goto out_free_run;
2402 vcpu->pio_data = page_address(page);
2403
c5ea7660
AK		 2404 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
2405 FX_IMAGE_ALIGN);
2406 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
d917a6b9 2407 vcpu->cr0 = 0x10;
c5ea7660
AK		 2408
2409 r = kvm_arch_ops->vcpu_create(vcpu);
2410 if (r < 0)
2411 goto out_free_vcpus;
2412
2413 r = kvm_mmu_create(vcpu);
2414 if (r < 0)
2415 goto out_free_vcpus;
2416
2417 kvm_arch_ops->vcpu_load(vcpu);
2418 r = kvm_mmu_setup(vcpu);
2419 if (r >= 0)
2420 r = kvm_arch_ops->vcpu_setup(vcpu);
2421 vcpu_put(vcpu);
2422
2423 if (r < 0)
2424 goto out_free_vcpus;
2425
bccf2150
AK		 2426 r = create_vcpu_fd(vcpu);
2427 if (r < 0)
2428 goto out_free_vcpus;
2429
39c3b86e
AK		 2430 spin_lock(&kvm_lock);
2431 if (n >= kvm->nvcpus)
2432 kvm->nvcpus = n + 1;
2433 spin_unlock(&kvm_lock);
2434
bccf2150 2435 return r;
c5ea7660
AK		 2436
2437out_free_vcpus:
2438 kvm_free_vcpu(vcpu);
039576c0
AK		 2439out_free_run:
2440 free_page((unsigned long)vcpu->run);
2441 vcpu->run = NULL;
9a2bb7f4 2442out_unlock:
c5ea7660
AK		 2443 mutex_unlock(&vcpu->mutex);
2444out:
2445 return r;
2446}
2447
2cc51560
ED		 2448static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2449{
2450 u64 efer;
2451 int i;
2452 struct kvm_cpuid_entry *e, *entry;
2453
2454 rdmsrl(MSR_EFER, efer);
2455 entry = NULL;
2456 for (i = 0; i < vcpu->cpuid_nent; ++i) {
2457 e = &vcpu->cpuid_entries[i];
2458 if (e->function == 0x80000001) {
2459 entry = e;
2460 break;
2461 }
2462 }
2463 if (entry && (entry->edx & EFER_NX) && !(efer & EFER_NX)) {
2464 entry->edx &= ~(1 << 20);
2465 printk(KERN_INFO ": guest NX capability removed\n");
2466 }
2467}
2468
06465c5a
AK		 2469static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2470 struct kvm_cpuid *cpuid,
2471 struct kvm_cpuid_entry __user *entries)
2472{
2473 int r;
2474
2475 r = -E2BIG;
2476 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2477 goto out;
2478 r = -EFAULT;
2479 if (copy_from_user(&vcpu->cpuid_entries, entries,
2480 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2481 goto out;
2482 vcpu->cpuid_nent = cpuid->nent;
2cc51560 2483 cpuid_fix_nx_cap(vcpu);
06465c5a
AK		 2484 return 0;
2485
2486out:
2487 return r;
2488}
2489
1961d276
AK		 2490static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2491{
2492 if (sigset) {
2493 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2494 vcpu->sigset_active = 1;
2495 vcpu->sigset = *sigset;
2496 } else
2497 vcpu->sigset_active = 0;
2498 return 0;
2499}
2500
b8836737
AK		 2501/*
2502 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2503 * we have asm/x86/processor.h
2504 */
2505struct fxsave {
2506 u16 cwd;
2507 u16 swd;
2508 u16 twd;
2509 u16 fop;
2510 u64 rip;
2511 u64 rdp;
2512 u32 mxcsr;
2513 u32 mxcsr_mask;
2514 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2515#ifdef CONFIG_X86_64
2516 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2517#else
2518 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2519#endif
2520};
2521
2522static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2523{
2524 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2525
2526 vcpu_load(vcpu);
2527
2528 memcpy(fpu->fpr, fxsave->st_space, 128);
2529 fpu->fcw = fxsave->cwd;
2530 fpu->fsw = fxsave->swd;
2531 fpu->ftwx = fxsave->twd;
2532 fpu->last_opcode = fxsave->fop;
2533 fpu->last_ip = fxsave->rip;
2534 fpu->last_dp = fxsave->rdp;
2535 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2536
2537 vcpu_put(vcpu);
2538
2539 return 0;
2540}
2541
2542static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2543{
2544 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2545
2546 vcpu_load(vcpu);
2547
2548 memcpy(fxsave->st_space, fpu->fpr, 128);
2549 fxsave->cwd = fpu->fcw;
2550 fxsave->swd = fpu->fsw;
2551 fxsave->twd = fpu->ftwx;
2552 fxsave->fop = fpu->last_opcode;
2553 fxsave->rip = fpu->last_ip;
2554 fxsave->rdp = fpu->last_dp;
2555 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2556
2557 vcpu_put(vcpu);
2558
2559 return 0;
2560}
2561
bccf2150
AK		 2562static long kvm_vcpu_ioctl(struct file *filp,
2563 unsigned int ioctl, unsigned long arg)
6aa8b732 2564{
bccf2150 2565 struct kvm_vcpu *vcpu = filp->private_data;
2f366987 2566 void __user *argp = (void __user *)arg;
6aa8b732
AK		 2567 int r = -EINVAL;
2568
2569 switch (ioctl) {
9a2bb7f4 2570 case KVM_RUN:
f0fe5108
AK		 2571 r = -EINVAL;
2572 if (arg)
2573 goto out;
9a2bb7f4 2574 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
6aa8b732 2575 break;
6aa8b732
AK		 2576 case KVM_GET_REGS: {
2577 struct kvm_regs kvm_regs;
2578
bccf2150
AK		 2579 memset(&kvm_regs, 0, sizeof kvm_regs);
2580 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2581 if (r)
2582 goto out;
2583 r = -EFAULT;
2f366987 2584 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 2585 goto out;
2586 r = 0;
2587 break;
2588 }
2589 case KVM_SET_REGS: {
2590 struct kvm_regs kvm_regs;
2591
2592 r = -EFAULT;
2f366987 2593 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732 2594 goto out;
bccf2150 2595 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2596 if (r)
2597 goto out;
2598 r = 0;
2599 break;
2600 }
2601 case KVM_GET_SREGS: {
2602 struct kvm_sregs kvm_sregs;
2603
bccf2150
AK		 2604 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2605 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2606 if (r)
2607 goto out;
2608 r = -EFAULT;
2f366987 2609 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 2610 goto out;
2611 r = 0;
2612 break;
2613 }
2614 case KVM_SET_SREGS: {
2615 struct kvm_sregs kvm_sregs;
2616
2617 r = -EFAULT;
2f366987 2618 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732 2619 goto out;
bccf2150 2620 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2621 if (r)
2622 goto out;
2623 r = 0;
2624 break;
2625 }
2626 case KVM_TRANSLATE: {
2627 struct kvm_translation tr;
2628
2629 r = -EFAULT;
2f366987 2630 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732 2631 goto out;
bccf2150 2632 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
6aa8b732
AK		 2633 if (r)
2634 goto out;
2635 r = -EFAULT;
2f366987 2636 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 2637 goto out;
2638 r = 0;
2639 break;
2640 }
2641 case KVM_INTERRUPT: {
2642 struct kvm_interrupt irq;
2643
2644 r = -EFAULT;
2f366987 2645 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732 2646 goto out;
bccf2150 2647 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
6aa8b732
AK		 2648 if (r)
2649 goto out;
2650 r = 0;
2651 break;
2652 }
2653 case KVM_DEBUG_GUEST: {
2654 struct kvm_debug_guest dbg;
2655
2656 r = -EFAULT;
2f366987 2657 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732 2658 goto out;
bccf2150 2659 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
6aa8b732
AK		 2660 if (r)
2661 goto out;
2662 r = 0;
2663 break;
2664 }
bccf2150
AK		 2665 case KVM_GET_MSRS:
2666 r = msr_io(vcpu, argp, get_msr, 1);
2667 break;
2668 case KVM_SET_MSRS:
2669 r = msr_io(vcpu, argp, do_set_msr, 0);
2670 break;
06465c5a
AK		 2671 case KVM_SET_CPUID: {
2672 struct kvm_cpuid __user *cpuid_arg = argp;
2673 struct kvm_cpuid cpuid;
2674
2675 r = -EFAULT;
2676 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2677 goto out;
2678 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2679 if (r)
2680 goto out;
2681 break;
2682 }
1961d276
AK		 2683 case KVM_SET_SIGNAL_MASK: {
2684 struct kvm_signal_mask __user *sigmask_arg = argp;
2685 struct kvm_signal_mask kvm_sigmask;
2686 sigset_t sigset, *p;
2687
2688 p = NULL;
2689 if (argp) {
2690 r = -EFAULT;
2691 if (copy_from_user(&kvm_sigmask, argp,
2692 sizeof kvm_sigmask))
2693 goto out;
2694 r = -EINVAL;
2695 if (kvm_sigmask.len != sizeof sigset)
2696 goto out;
2697 r = -EFAULT;
2698 if (copy_from_user(&sigset, sigmask_arg->sigset,
2699 sizeof sigset))
2700 goto out;
2701 p = &sigset;
2702 }
2703 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2704 break;
2705 }
b8836737
AK		 2706 case KVM_GET_FPU: {
2707 struct kvm_fpu fpu;
2708
2709 memset(&fpu, 0, sizeof fpu);
2710 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
2711 if (r)
2712 goto out;
2713 r = -EFAULT;
2714 if (copy_to_user(argp, &fpu, sizeof fpu))
2715 goto out;
2716 r = 0;
2717 break;
2718 }
2719 case KVM_SET_FPU: {
2720 struct kvm_fpu fpu;
2721
2722 r = -EFAULT;
2723 if (copy_from_user(&fpu, argp, sizeof fpu))
2724 goto out;
2725 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
2726 if (r)
2727 goto out;
2728 r = 0;
2729 break;
2730 }
bccf2150
AK		 2731 default:
2732 ;
2733 }
2734out:
2735 return r;
2736}
2737
2738static long kvm_vm_ioctl(struct file *filp,
2739 unsigned int ioctl, unsigned long arg)
2740{
2741 struct kvm *kvm = filp->private_data;
2742 void __user *argp = (void __user *)arg;
2743 int r = -EINVAL;
2744
2745 switch (ioctl) {
2746 case KVM_CREATE_VCPU:
2747 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2748 if (r < 0)
2749 goto out;
2750 break;
6aa8b732
AK		 2751 case KVM_SET_MEMORY_REGION: {
2752 struct kvm_memory_region kvm_mem;
2753
2754 r = -EFAULT;
2f366987 2755 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
6aa8b732 2756 goto out;
2c6f5df9 2757 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
6aa8b732
AK		 2758 if (r)
2759 goto out;
2760 break;
2761 }
2762 case KVM_GET_DIRTY_LOG: {
2763 struct kvm_dirty_log log;
2764
2765 r = -EFAULT;
2f366987 2766 if (copy_from_user(&log, argp, sizeof log))
6aa8b732 2767 goto out;
2c6f5df9 2768 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
6aa8b732
AK		 2769 if (r)
2770 goto out;
2771 break;
2772 }
e8207547
AK		 2773 case KVM_SET_MEMORY_ALIAS: {
2774 struct kvm_memory_alias alias;
2775
2776 r = -EFAULT;
2777 if (copy_from_user(&alias, argp, sizeof alias))
2778 goto out;
2779 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
2780 if (r)
2781 goto out;
2782 break;
2783 }
f17abe9a
AK		 2784 default:
2785 ;
2786 }
2787out:
2788 return r;
2789}
2790
2791static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2792 unsigned long address,
2793 int *type)
2794{
2795 struct kvm *kvm = vma->vm_file->private_data;
2796 unsigned long pgoff;
f17abe9a
AK		 2797 struct page *page;
2798
2799 *type = VM_FAULT_MINOR;
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);
2805 return page;
2806}
2807
2808static struct vm_operations_struct kvm_vm_vm_ops = {
2809 .nopage = kvm_vm_nopage,
2810};
2811
2812static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2813{
2814 vma->vm_ops = &kvm_vm_vm_ops;
2815 return 0;
2816}
2817
2818static struct file_operations kvm_vm_fops = {
2819 .release = kvm_vm_release,
2820 .unlocked_ioctl = kvm_vm_ioctl,
2821 .compat_ioctl = kvm_vm_ioctl,
2822 .mmap = kvm_vm_mmap,
2823};
2824
2825static int kvm_dev_ioctl_create_vm(void)
2826{
2827 int fd, r;
2828 struct inode *inode;
2829 struct file *file;
2830 struct kvm *kvm;
2831
f17abe9a 2832 kvm = kvm_create_vm();
d6d28168
AK		 2833 if (IS_ERR(kvm))
2834 return PTR_ERR(kvm);
2835 r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
2836 if (r) {
2837 kvm_destroy_vm(kvm);
2838 return r;
f17abe9a
AK		 2839 }
2840
bccf2150 2841 kvm->filp = file;
f17abe9a 2842
f17abe9a 2843 return fd;
f17abe9a
AK		 2844}
2845
2846static long kvm_dev_ioctl(struct file *filp,
2847 unsigned int ioctl, unsigned long arg)
2848{
2849 void __user *argp = (void __user *)arg;
07c45a36 2850 long r = -EINVAL;
f17abe9a
AK		 2851
2852 switch (ioctl) {
2853 case KVM_GET_API_VERSION:
f0fe5108
AK		 2854 r = -EINVAL;
2855 if (arg)
2856 goto out;
f17abe9a
AK		 2857 r = KVM_API_VERSION;
2858 break;
2859 case KVM_CREATE_VM:
f0fe5108
AK		 2860 r = -EINVAL;
2861 if (arg)
2862 goto out;
f17abe9a
AK		 2863 r = kvm_dev_ioctl_create_vm();
2864 break;
6aa8b732 2865 case KVM_GET_MSR_INDEX_LIST: {
2f366987 2866 struct kvm_msr_list __user *user_msr_list = argp;
6aa8b732
AK		 2867 struct kvm_msr_list msr_list;
2868 unsigned n;
2869
2870 r = -EFAULT;
2871 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2872 goto out;
2873 n = msr_list.nmsrs;
6f00e68f 2874 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
6aa8b732
AK		 2875 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2876 goto out;
2877 r = -E2BIG;
bf591b24 2878 if (n < num_msrs_to_save)
6aa8b732
AK		 2879 goto out;
2880 r = -EFAULT;
2881 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 2882 num_msrs_to_save * sizeof(u32)))
6aa8b732 2883 goto out;
6f00e68f
AK		 2884 if (copy_to_user(user_msr_list->indices
2885 + num_msrs_to_save * sizeof(u32),
2886 &emulated_msrs,
2887 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2888 goto out;
6aa8b732 2889 r = 0;
cc1d8955 2890 break;
6aa8b732 2891 }
5d308f45
AK		 2892 case KVM_CHECK_EXTENSION:
2893 /*
2894 * No extensions defined at present.
2895 */
2896 r = 0;
2897 break;
07c45a36
AK		 2898 case KVM_GET_VCPU_MMAP_SIZE:
2899 r = -EINVAL;
2900 if (arg)
2901 goto out;
039576c0 2902 r = 2 * PAGE_SIZE;
07c45a36 2903 break;
6aa8b732
AK		 2904 default:
2905 ;
2906 }
2907out:
2908 return r;
2909}
2910
6aa8b732
AK		 2911static struct file_operations kvm_chardev_ops = {
2912 .open = kvm_dev_open,
2913 .release = kvm_dev_release,
2914 .unlocked_ioctl = kvm_dev_ioctl,
2915 .compat_ioctl = kvm_dev_ioctl,
6aa8b732
AK		 2916};
2917
2918static struct miscdevice kvm_dev = {
bbe4432e 2919 KVM_MINOR,
6aa8b732
AK		 2920 "kvm",
2921 &kvm_chardev_ops,
2922};
2923
2924static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2925 void *v)
2926{
2927 if (val == SYS_RESTART) {
2928 /*
2929 * Some (well, at least mine) BIOSes hang on reboot if
2930 * in vmx root mode.
2931 */
2932 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
8b6d44c7 2933 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2934 }
2935 return NOTIFY_OK;
2936}
2937
2938static struct notifier_block kvm_reboot_notifier = {
2939 .notifier_call = kvm_reboot,
2940 .priority = 0,
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
2976static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2977 void *v)
2978{
2979 int cpu = (long)v;
2980
2981 switch (val) {
43934a38 2982 case CPU_DOWN_PREPARE:
8bb78442 2983 case CPU_DOWN_PREPARE_FROZEN:
774c47f1 2984 case CPU_UP_CANCELED:
8bb78442 2985 case CPU_UP_CANCELED_FROZEN:
43934a38
JK		 2986 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2987 cpu);
774c47f1
AK		 2988 decache_vcpus_on_cpu(cpu);
2989 smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
2990 NULL, 0, 1);
2991 break;
43934a38 2992 case CPU_ONLINE:
8bb78442 2993 case CPU_ONLINE_FROZEN:
43934a38
JK		 2994 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2995 cpu);
774c47f1
AK		 2996 smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
2997 NULL, 0, 1);
2998 break;
2999 }
3000 return NOTIFY_OK;
3001}
3002
2eeb2e94
GH		 3003void kvm_io_bus_init(struct kvm_io_bus *bus)
3004{
3005 memset(bus, 0, sizeof(*bus));
3006}
3007
3008void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3009{
3010 int i;
3011
3012 for (i = 0; i < bus->dev_count; i++) {
3013 struct kvm_io_device *pos = bus->devs[i];
3014
3015 kvm_iodevice_destructor(pos);
3016 }
3017}
3018
3019struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
3020{
3021 int i;
3022
3023 for (i = 0; i < bus->dev_count; i++) {
3024 struct kvm_io_device *pos = bus->devs[i];
3025
3026 if (pos->in_range(pos, addr))
3027 return pos;
3028 }
3029
3030 return NULL;
3031}
3032
3033void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
3034{
3035 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
3036
3037 bus->devs[bus->dev_count++] = dev;
3038}
3039
774c47f1
AK		 3040static struct notifier_block kvm_cpu_notifier = {
3041 .notifier_call = kvm_cpu_hotplug,
3042 .priority = 20, /* must be > scheduler priority */
3043};
3044
1165f5fe
AK		 3045static u64 stat_get(void *_offset)
3046{
3047 unsigned offset = (long)_offset;
3048 u64 total = 0;
3049 struct kvm *kvm;
3050 struct kvm_vcpu *vcpu;
3051 int i;
3052
3053 spin_lock(&kvm_lock);
3054 list_for_each_entry(kvm, &vm_list, vm_list)
3055 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3056 vcpu = &kvm->vcpus[i];
3057 total += *(u32 *)((void *)vcpu + offset);
3058 }
3059 spin_unlock(&kvm_lock);
3060 return total;
3061}
3062
3063static void stat_set(void *offset, u64 val)
3064{
3065}
3066
3067DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, stat_set, "%llu\n");
3068
6aa8b732
AK		 3069static __init void kvm_init_debug(void)
3070{
3071 struct kvm_stats_debugfs_item *p;
3072
8b6d44c7 3073 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732 3074 for (p = debugfs_entries; p->name; ++p)
1165f5fe
AK		 3075 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
3076 (void *)(long)p->offset,
3077 &stat_fops);
6aa8b732
AK		 3078}
3079
3080static void kvm_exit_debug(void)
3081{
3082 struct kvm_stats_debugfs_item *p;
3083
3084 for (p = debugfs_entries; p->name; ++p)
3085 debugfs_remove(p->dentry);
3086 debugfs_remove(debugfs_dir);
3087}
3088
59ae6c6b
AK		 3089static int kvm_suspend(struct sys_device *dev, pm_message_t state)
3090{
3091 decache_vcpus_on_cpu(raw_smp_processor_id());
19d1408d 3092 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
59ae6c6b
AK		 3093 return 0;
3094}
3095
3096static int kvm_resume(struct sys_device *dev)
3097{
19d1408d 3098 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
59ae6c6b
AK		 3099 return 0;
3100}
3101
3102static struct sysdev_class kvm_sysdev_class = {
3103 set_kset_name("kvm"),
3104 .suspend = kvm_suspend,
3105 .resume = kvm_resume,
3106};
3107
3108static struct sys_device kvm_sysdev = {
3109 .id = 0,
3110 .cls = &kvm_sysdev_class,
3111};
3112
6aa8b732
AK		 3113hpa_t bad_page_address;
3114
3115int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
3116{
3117 int r;
3118
09db28b8
YI		 3119 if (kvm_arch_ops) {
3120 printk(KERN_ERR "kvm: already loaded the other module\n");
3121 return -EEXIST;
3122 }
3123
e097f35c 3124 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 3125 printk(KERN_ERR "kvm: no hardware support\n");
3126 return -EOPNOTSUPP;
3127 }
e097f35c 3128 if (ops->disabled_by_bios()) {
6aa8b732
AK		 3129 printk(KERN_ERR "kvm: disabled by bios\n");
3130 return -EOPNOTSUPP;
3131 }
3132
e097f35c
YI		 3133 kvm_arch_ops = ops;
3134
6aa8b732
AK		 3135 r = kvm_arch_ops->hardware_setup();
3136 if (r < 0)
ca45aaae 3137 goto out;
6aa8b732 3138
8b6d44c7 3139 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
774c47f1
AK		 3140 r = register_cpu_notifier(&kvm_cpu_notifier);
3141 if (r)
3142 goto out_free_1;
6aa8b732
AK		 3143 register_reboot_notifier(&kvm_reboot_notifier);
3144
59ae6c6b
AK		 3145 r = sysdev_class_register(&kvm_sysdev_class);
3146 if (r)
3147 goto out_free_2;
3148
3149 r = sysdev_register(&kvm_sysdev);
3150 if (r)
3151 goto out_free_3;
3152
6aa8b732
AK		 3153 kvm_chardev_ops.owner = module;
3154
3155 r = misc_register(&kvm_dev);
3156 if (r) {
3157 printk (KERN_ERR "kvm: misc device register failed\n");
3158 goto out_free;
3159 }
3160
3161 return r;
3162
3163out_free:
59ae6c6b
AK		 3164 sysdev_unregister(&kvm_sysdev);
3165out_free_3:
3166 sysdev_class_unregister(&kvm_sysdev_class);
3167out_free_2:
6aa8b732 3168 unregister_reboot_notifier(&kvm_reboot_notifier);
774c47f1
AK		 3169 unregister_cpu_notifier(&kvm_cpu_notifier);
3170out_free_1:
8b6d44c7 3171 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 3172 kvm_arch_ops->hardware_unsetup();
ca45aaae
AK		 3173out:
3174 kvm_arch_ops = NULL;
6aa8b732
AK		 3175 return r;
3176}
3177
3178void kvm_exit_arch(void)
3179{
3180 misc_deregister(&kvm_dev);
59ae6c6b
AK		 3181 sysdev_unregister(&kvm_sysdev);
3182 sysdev_class_unregister(&kvm_sysdev_class);
6aa8b732 3183 unregister_reboot_notifier(&kvm_reboot_notifier);
59ae6c6b 3184 unregister_cpu_notifier(&kvm_cpu_notifier);
8b6d44c7 3185 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 3186 kvm_arch_ops->hardware_unsetup();
09db28b8 3187 kvm_arch_ops = NULL;
6aa8b732
AK		 3188}
3189
3190static __init int kvm_init(void)
3191{
3192 static struct page *bad_page;
37e29d90
AK		 3193 int r;
3194
b5a33a75
AK		 3195 r = kvm_mmu_module_init();
3196 if (r)
3197 goto out4;
3198
6aa8b732
AK		 3199 kvm_init_debug();
3200
bf591b24
MR		 3201 kvm_init_msr_list();
3202
6aa8b732
AK		 3203 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3204 r = -ENOMEM;
3205 goto out;
3206 }
3207
3208 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3209 memset(__va(bad_page_address), 0, PAGE_SIZE);
3210
58e690e6 3211 return 0;
6aa8b732
AK		 3212
3213out:
3214 kvm_exit_debug();
b5a33a75
AK		 3215 kvm_mmu_module_exit();
3216out4:
6aa8b732
AK		 3217 return r;
3218}
3219
3220static __exit void kvm_exit(void)
3221{
3222 kvm_exit_debug();
3223 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
b5a33a75 3224 kvm_mmu_module_exit();
6aa8b732
AK		 3225}
3226
3227module_init(kvm_init)
3228module_exit(kvm_exit)
3229
3230EXPORT_SYMBOL_GPL(kvm_init_arch);
3231EXPORT_SYMBOL_GPL(kvm_exit_arch);
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