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KVM: Keep an upper bound of initialized vcpus
[mirror_ubuntu-bionic-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"
19
20#include <linux/kvm.h>
21#include <linux/module.h>
22#include <linux/errno.h>
e9cdb1e3 23#include <linux/magic.h>
6aa8b732
AK		 24#include <asm/processor.h>
25#include <linux/percpu.h>
26#include <linux/gfp.h>
27#include <asm/msr.h>
28#include <linux/mm.h>
29#include <linux/miscdevice.h>
30#include <linux/vmalloc.h>
31#include <asm/uaccess.h>
32#include <linux/reboot.h>
33#include <asm/io.h>
34#include <linux/debugfs.h>
35#include <linux/highmem.h>
36#include <linux/file.h>
37#include <asm/desc.h>
59ae6c6b 38#include <linux/sysdev.h>
774c47f1 39#include <linux/cpu.h>
f17abe9a 40#include <linux/file.h>
37e29d90
AK		 41#include <linux/fs.h>
42#include <linux/mount.h>
e8edc6e0 43#include <linux/sched.h>
6aa8b732
AK		 44
45#include "x86_emulate.h"
46#include "segment_descriptor.h"
47
48MODULE_AUTHOR("Qumranet");
49MODULE_LICENSE("GPL");
50
133de902
AK		 51static DEFINE_SPINLOCK(kvm_lock);
52static LIST_HEAD(vm_list);
53
6aa8b732 54struct kvm_arch_ops *kvm_arch_ops;
1165f5fe
AK		 55
56#define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
6aa8b732
AK		 57
58static struct kvm_stats_debugfs_item {
59 const char *name;
1165f5fe 60 int offset;
6aa8b732
AK		 61 struct dentry *dentry;
62} debugfs_entries[] = {
1165f5fe
AK		 63 { "pf_fixed", STAT_OFFSET(pf_fixed) },
64 { "pf_guest", STAT_OFFSET(pf_guest) },
65 { "tlb_flush", STAT_OFFSET(tlb_flush) },
66 { "invlpg", STAT_OFFSET(invlpg) },
67 { "exits", STAT_OFFSET(exits) },
68 { "io_exits", STAT_OFFSET(io_exits) },
69 { "mmio_exits", STAT_OFFSET(mmio_exits) },
70 { "signal_exits", STAT_OFFSET(signal_exits) },
71 { "irq_window", STAT_OFFSET(irq_window_exits) },
72 { "halt_exits", STAT_OFFSET(halt_exits) },
73 { "request_irq", STAT_OFFSET(request_irq_exits) },
74 { "irq_exits", STAT_OFFSET(irq_exits) },
e6adf283 75 { "light_exits", STAT_OFFSET(light_exits) },
2cc51560 76 { "efer_reload", STAT_OFFSET(efer_reload) },
1165f5fe 77 { NULL }
6aa8b732
AK		 78};
79
80static struct dentry *debugfs_dir;
81
37e29d90
AK		 82struct vfsmount *kvmfs_mnt;
83
6aa8b732
AK		 84#define MAX_IO_MSRS 256
85
86#define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
87#define LMSW_GUEST_MASK 0x0eULL
88#define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
89#define CR8_RESEVED_BITS (~0x0fULL)
90#define EFER_RESERVED_BITS 0xfffffffffffff2fe
91
05b3e0c2 92#ifdef CONFIG_X86_64
6aa8b732
AK		 93// LDT or TSS descriptor in the GDT. 16 bytes.
94struct segment_descriptor_64 {
95 struct segment_descriptor s;
96 u32 base_higher;
97 u32 pad_zero;
98};
99
100#endif
101
bccf2150
AK		 102static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
103 unsigned long arg);
104
f17abe9a
AK		 105static struct inode *kvmfs_inode(struct file_operations *fops)
106{
107 int error = -ENOMEM;
108 struct inode *inode = new_inode(kvmfs_mnt->mnt_sb);
109
110 if (!inode)
111 goto eexit_1;
112
113 inode->i_fop = fops;
114
115 /*
116 * Mark the inode dirty from the very beginning,
117 * that way it will never be moved to the dirty
118 * list because mark_inode_dirty() will think
119 * that it already _is_ on the dirty list.
120 */
121 inode->i_state = I_DIRTY;
122 inode->i_mode = S_IRUSR | S_IWUSR;
123 inode->i_uid = current->fsuid;
124 inode->i_gid = current->fsgid;
125 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
126 return inode;
127
128eexit_1:
129 return ERR_PTR(error);
130}
131
132static struct file *kvmfs_file(struct inode *inode, void *private_data)
133{
134 struct file *file = get_empty_filp();
135
136 if (!file)
137 return ERR_PTR(-ENFILE);
138
139 file->f_path.mnt = mntget(kvmfs_mnt);
140 file->f_path.dentry = d_alloc_anon(inode);
141 if (!file->f_path.dentry)
142 return ERR_PTR(-ENOMEM);
143 file->f_mapping = inode->i_mapping;
144
145 file->f_pos = 0;
146 file->f_flags = O_RDWR;
147 file->f_op = inode->i_fop;
148 file->f_mode = FMODE_READ | FMODE_WRITE;
149 file->f_version = 0;
150 file->private_data = private_data;
151 return file;
152}
153
6aa8b732
AK		 154unsigned long segment_base(u16 selector)
155{
156 struct descriptor_table gdt;
157 struct segment_descriptor *d;
158 unsigned long table_base;
159 typedef unsigned long ul;
160 unsigned long v;
161
162 if (selector == 0)
163 return 0;
164
165 asm ("sgdt %0" : "=m"(gdt));
166 table_base = gdt.base;
167
168 if (selector & 4) { /* from ldt */
169 u16 ldt_selector;
170
171 asm ("sldt %0" : "=g"(ldt_selector));
172 table_base = segment_base(ldt_selector);
173 }
174 d = (struct segment_descriptor *)(table_base + (selector & ~7));
175 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
05b3e0c2 176#ifdef CONFIG_X86_64
6aa8b732
AK		 177 if (d->system == 0
178 && (d->type == 2 || d->type == 9 || d->type == 11))
179 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
180#endif
181 return v;
182}
183EXPORT_SYMBOL_GPL(segment_base);
184
5aacf0ca
JM		 185static inline int valid_vcpu(int n)
186{
187 return likely(n >= 0 && n < KVM_MAX_VCPUS);
188}
189
d27d4aca
AK		 190int kvm_read_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
191 void *dest)
6aa8b732
AK		 192{
193 unsigned char *host_buf = dest;
194 unsigned long req_size = size;
195
196 while (size) {
197 hpa_t paddr;
198 unsigned now;
199 unsigned offset;
200 hva_t guest_buf;
201
202 paddr = gva_to_hpa(vcpu, addr);
203
204 if (is_error_hpa(paddr))
205 break;
206
207 guest_buf = (hva_t)kmap_atomic(
208 pfn_to_page(paddr >> PAGE_SHIFT),
209 KM_USER0);
210 offset = addr & ~PAGE_MASK;
211 guest_buf |= offset;
212 now = min(size, PAGE_SIZE - offset);
213 memcpy(host_buf, (void*)guest_buf, now);
214 host_buf += now;
215 addr += now;
216 size -= now;
217 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
218 }
219 return req_size - size;
220}
221EXPORT_SYMBOL_GPL(kvm_read_guest);
222
d27d4aca
AK		 223int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
224 void *data)
6aa8b732
AK		 225{
226 unsigned char *host_buf = data;
227 unsigned long req_size = size;
228
229 while (size) {
230 hpa_t paddr;
231 unsigned now;
232 unsigned offset;
233 hva_t guest_buf;
ab51a434 234 gfn_t gfn;
6aa8b732
AK		 235
236 paddr = gva_to_hpa(vcpu, addr);
237
238 if (is_error_hpa(paddr))
239 break;
240
ab51a434
UL		 241 gfn = vcpu->mmu.gva_to_gpa(vcpu, addr) >> PAGE_SHIFT;
242 mark_page_dirty(vcpu->kvm, gfn);
6aa8b732
AK		 243 guest_buf = (hva_t)kmap_atomic(
244 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
245 offset = addr & ~PAGE_MASK;
246 guest_buf |= offset;
247 now = min(size, PAGE_SIZE - offset);
248 memcpy((void*)guest_buf, host_buf, now);
249 host_buf += now;
250 addr += now;
251 size -= now;
252 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
253 }
254 return req_size - size;
255}
256EXPORT_SYMBOL_GPL(kvm_write_guest);
257
7702fd1f
AK		 258void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
259{
260 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
261 return;
262
263 vcpu->guest_fpu_loaded = 1;
264 fx_save(vcpu->host_fx_image);
265 fx_restore(vcpu->guest_fx_image);
266}
267EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
268
269void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
270{
271 if (!vcpu->guest_fpu_loaded)
272 return;
273
274 vcpu->guest_fpu_loaded = 0;
275 fx_save(vcpu->guest_fx_image);
276 fx_restore(vcpu->host_fx_image);
277}
278EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
279
bccf2150
AK		 280/*
281 * Switches to specified vcpu, until a matching vcpu_put()
282 */
283static void vcpu_load(struct kvm_vcpu *vcpu)
6aa8b732 284{
bccf2150
AK		 285 mutex_lock(&vcpu->mutex);
286 kvm_arch_ops->vcpu_load(vcpu);
6aa8b732
AK		 287}
288
289/*
bccf2150
AK		 290 * Switches to specified vcpu, until a matching vcpu_put(). Will return NULL
291 * if the slot is not populated.
6aa8b732 292 */
bccf2150 293static struct kvm_vcpu *vcpu_load_slot(struct kvm *kvm, int slot)
6aa8b732 294{
bccf2150 295 struct kvm_vcpu *vcpu = &kvm->vcpus[slot];
6aa8b732
AK		 296
297 mutex_lock(&vcpu->mutex);
bccf2150 298 if (!vcpu->vmcs) {
6aa8b732 299 mutex_unlock(&vcpu->mutex);
8b6d44c7 300 return NULL;
6aa8b732 301 }
bccf2150
AK		 302 kvm_arch_ops->vcpu_load(vcpu);
303 return vcpu;
6aa8b732
AK		 304}
305
306static void vcpu_put(struct kvm_vcpu *vcpu)
307{
308 kvm_arch_ops->vcpu_put(vcpu);
6aa8b732
AK		 309 mutex_unlock(&vcpu->mutex);
310}
311
f17abe9a 312static struct kvm *kvm_create_vm(void)
6aa8b732
AK		 313{
314 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
315 int i;
316
317 if (!kvm)
f17abe9a 318 return ERR_PTR(-ENOMEM);
6aa8b732
AK		 319
320 spin_lock_init(&kvm->lock);
321 INIT_LIST_HEAD(&kvm->active_mmu_pages);
120e9a45
AK		 322 spin_lock(&kvm_lock);
323 list_add(&kvm->vm_list, &vm_list);
324 spin_unlock(&kvm_lock);
6aa8b732
AK		 325 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
326 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
327
328 mutex_init(&vcpu->mutex);
133de902 329 vcpu->cpu = -1;
86a2b42e 330 vcpu->kvm = kvm;
6aa8b732 331 vcpu->mmu.root_hpa = INVALID_PAGE;
6aa8b732 332 }
f17abe9a
AK		 333 return kvm;
334}
335
336static int kvm_dev_open(struct inode *inode, struct file *filp)
337{
6aa8b732
AK		 338 return 0;
339}
340
341/*
342 * Free any memory in @free but not in @dont.
343 */
344static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
345 struct kvm_memory_slot *dont)
346{
347 int i;
348
349 if (!dont || free->phys_mem != dont->phys_mem)
350 if (free->phys_mem) {
351 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 352 if (free->phys_mem[i])
353 __free_page(free->phys_mem[i]);
6aa8b732
AK		 354 vfree(free->phys_mem);
355 }
356
357 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
358 vfree(free->dirty_bitmap);
359
8b6d44c7 360 free->phys_mem = NULL;
6aa8b732 361 free->npages = 0;
8b6d44c7 362 free->dirty_bitmap = NULL;
6aa8b732
AK		 363}
364
365static void kvm_free_physmem(struct kvm *kvm)
366{
367 int i;
368
369 for (i = 0; i < kvm->nmemslots; ++i)
8b6d44c7 370 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
6aa8b732
AK		 371}
372
039576c0
AK		 373static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
374{
375 int i;
376
377 for (i = 0; i < 2; ++i)
378 if (vcpu->pio.guest_pages[i]) {
379 __free_page(vcpu->pio.guest_pages[i]);
380 vcpu->pio.guest_pages[i] = NULL;
381 }
382}
383
7b53aa56
AK		 384static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
385{
386 if (!vcpu->vmcs)
387 return;
388
389 vcpu_load(vcpu);
390 kvm_mmu_unload(vcpu);
391 vcpu_put(vcpu);
392}
393
6aa8b732
AK		 394static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
395{
bccf2150 396 if (!vcpu->vmcs)
1e8ba6fb
IM		 397 return;
398
bccf2150 399 vcpu_load(vcpu);
6aa8b732 400 kvm_mmu_destroy(vcpu);
08438475 401 vcpu_put(vcpu);
9ede74e0 402 kvm_arch_ops->vcpu_free(vcpu);
9a2bb7f4
AK		 403 free_page((unsigned long)vcpu->run);
404 vcpu->run = NULL;
039576c0
AK		 405 free_page((unsigned long)vcpu->pio_data);
406 vcpu->pio_data = NULL;
407 free_pio_guest_pages(vcpu);
6aa8b732
AK		 408}
409
410static void kvm_free_vcpus(struct kvm *kvm)
411{
412 unsigned int i;
413
7b53aa56
AK		 414 /*
415 * Unpin any mmu pages first.
416 */
417 for (i = 0; i < KVM_MAX_VCPUS; ++i)
418 kvm_unload_vcpu_mmu(&kvm->vcpus[i]);
6aa8b732
AK		 419 for (i = 0; i < KVM_MAX_VCPUS; ++i)
420 kvm_free_vcpu(&kvm->vcpus[i]);
421}
422
423static int kvm_dev_release(struct inode *inode, struct file *filp)
424{
f17abe9a
AK		 425 return 0;
426}
6aa8b732 427
f17abe9a
AK		 428static void kvm_destroy_vm(struct kvm *kvm)
429{
133de902
AK		 430 spin_lock(&kvm_lock);
431 list_del(&kvm->vm_list);
432 spin_unlock(&kvm_lock);
6aa8b732
AK		 433 kvm_free_vcpus(kvm);
434 kvm_free_physmem(kvm);
435 kfree(kvm);
f17abe9a
AK		 436}
437
438static int kvm_vm_release(struct inode *inode, struct file *filp)
439{
440 struct kvm *kvm = filp->private_data;
441
442 kvm_destroy_vm(kvm);
6aa8b732
AK		 443 return 0;
444}
445
446static void inject_gp(struct kvm_vcpu *vcpu)
447{
448 kvm_arch_ops->inject_gp(vcpu, 0);
449}
450
1342d353
AK		 451/*
452 * Load the pae pdptrs. Return true is they are all valid.
453 */
454static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
6aa8b732
AK		 455{
456 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
1342d353 457 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
6aa8b732
AK		 458 int i;
459 u64 pdpte;
460 u64 *pdpt;
1342d353 461 int ret;
954bbbc2 462 struct page *page;
6aa8b732
AK		 463
464 spin_lock(&vcpu->kvm->lock);
954bbbc2
AK		 465 page = gfn_to_page(vcpu->kvm, pdpt_gfn);
466 /* FIXME: !page - emulate? 0xff? */
467 pdpt = kmap_atomic(page, KM_USER0);
6aa8b732 468
1342d353 469 ret = 1;
6aa8b732
AK		 470 for (i = 0; i < 4; ++i) {
471 pdpte = pdpt[offset + i];
1342d353
AK		 472 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
473 ret = 0;
474 goto out;
475 }
6aa8b732
AK		 476 }
477
1342d353
AK		 478 for (i = 0; i < 4; ++i)
479 vcpu->pdptrs[i] = pdpt[offset + i];
480
481out:
6aa8b732
AK		 482 kunmap_atomic(pdpt, KM_USER0);
483 spin_unlock(&vcpu->kvm->lock);
484
1342d353 485 return ret;
6aa8b732
AK		 486}
487
488void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
489{
490 if (cr0 & CR0_RESEVED_BITS) {
491 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
492 cr0, vcpu->cr0);
493 inject_gp(vcpu);
494 return;
495 }
496
497 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
498 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
499 inject_gp(vcpu);
500 return;
501 }
502
503 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
504 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
505 "and a clear PE flag\n");
506 inject_gp(vcpu);
507 return;
508 }
509
510 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 511#ifdef CONFIG_X86_64
6aa8b732
AK		 512 if ((vcpu->shadow_efer & EFER_LME)) {
513 int cs_db, cs_l;
514
515 if (!is_pae(vcpu)) {
516 printk(KERN_DEBUG "set_cr0: #GP, start paging "
517 "in long mode while PAE is disabled\n");
518 inject_gp(vcpu);
519 return;
520 }
521 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
522 if (cs_l) {
523 printk(KERN_DEBUG "set_cr0: #GP, start paging "
524 "in long mode while CS.L == 1\n");
525 inject_gp(vcpu);
526 return;
527
528 }
529 } else
530#endif
1342d353 531 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 532 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
533 "reserved bits\n");
534 inject_gp(vcpu);
535 return;
536 }
537
538 }
539
540 kvm_arch_ops->set_cr0(vcpu, cr0);
541 vcpu->cr0 = cr0;
542
543 spin_lock(&vcpu->kvm->lock);
544 kvm_mmu_reset_context(vcpu);
545 spin_unlock(&vcpu->kvm->lock);
546 return;
547}
548EXPORT_SYMBOL_GPL(set_cr0);
549
550void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
551{
552 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
553}
554EXPORT_SYMBOL_GPL(lmsw);
555
556void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
557{
558 if (cr4 & CR4_RESEVED_BITS) {
559 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
560 inject_gp(vcpu);
561 return;
562 }
563
a9058ecd 564 if (is_long_mode(vcpu)) {
6aa8b732
AK		 565 if (!(cr4 & CR4_PAE_MASK)) {
566 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
567 "in long mode\n");
568 inject_gp(vcpu);
569 return;
570 }
571 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
1342d353 572 && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 573 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
574 inject_gp(vcpu);
575 }
576
577 if (cr4 & CR4_VMXE_MASK) {
578 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
579 inject_gp(vcpu);
580 return;
581 }
582 kvm_arch_ops->set_cr4(vcpu, cr4);
583 spin_lock(&vcpu->kvm->lock);
584 kvm_mmu_reset_context(vcpu);
585 spin_unlock(&vcpu->kvm->lock);
586}
587EXPORT_SYMBOL_GPL(set_cr4);
588
589void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
590{
a9058ecd 591 if (is_long_mode(vcpu)) {
d27d4aca 592 if (cr3 & CR3_L_MODE_RESEVED_BITS) {
6aa8b732
AK		 593 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
594 inject_gp(vcpu);
595 return;
596 }
597 } else {
598 if (cr3 & CR3_RESEVED_BITS) {
599 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
600 inject_gp(vcpu);
601 return;
602 }
603 if (is_paging(vcpu) && is_pae(vcpu) &&
1342d353 604 !load_pdptrs(vcpu, cr3)) {
6aa8b732
AK		 605 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
606 "reserved bits\n");
607 inject_gp(vcpu);
608 return;
609 }
610 }
611
612 vcpu->cr3 = cr3;
613 spin_lock(&vcpu->kvm->lock);
d21225ee
IM		 614 /*
615 * Does the new cr3 value map to physical memory? (Note, we
616 * catch an invalid cr3 even in real-mode, because it would
617 * cause trouble later on when we turn on paging anyway.)
618 *
619 * A real CPU would silently accept an invalid cr3 and would
620 * attempt to use it - with largely undefined (and often hard
621 * to debug) behavior on the guest side.
622 */
623 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
624 inject_gp(vcpu);
625 else
626 vcpu->mmu.new_cr3(vcpu);
6aa8b732
AK		 627 spin_unlock(&vcpu->kvm->lock);
628}
629EXPORT_SYMBOL_GPL(set_cr3);
630
631void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
632{
633 if ( cr8 & CR8_RESEVED_BITS) {
634 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
635 inject_gp(vcpu);
636 return;
637 }
638 vcpu->cr8 = cr8;
639}
640EXPORT_SYMBOL_GPL(set_cr8);
641
642void fx_init(struct kvm_vcpu *vcpu)
643{
644 struct __attribute__ ((__packed__)) fx_image_s {
645 u16 control; //fcw
646 u16 status; //fsw
647 u16 tag; // ftw
648 u16 opcode; //fop
649 u64 ip; // fpu ip
650 u64 operand;// fpu dp
651 u32 mxcsr;
652 u32 mxcsr_mask;
653
654 } *fx_image;
655
656 fx_save(vcpu->host_fx_image);
657 fpu_init();
658 fx_save(vcpu->guest_fx_image);
659 fx_restore(vcpu->host_fx_image);
660
661 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
662 fx_image->mxcsr = 0x1f80;
663 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
664 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
665}
666EXPORT_SYMBOL_GPL(fx_init);
667
02b27c1f
UL		 668static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
669{
670 spin_lock(&vcpu->kvm->lock);
671 kvm_mmu_slot_remove_write_access(vcpu, slot);
672 spin_unlock(&vcpu->kvm->lock);
673}
674
6aa8b732
AK		 675/*
676 * Allocate some memory and give it an address in the guest physical address
677 * space.
678 *
679 * Discontiguous memory is allowed, mostly for framebuffers.
680 */
2c6f5df9
AK		 681static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
682 struct kvm_memory_region *mem)
6aa8b732
AK		 683{
684 int r;
685 gfn_t base_gfn;
686 unsigned long npages;
687 unsigned long i;
688 struct kvm_memory_slot *memslot;
689 struct kvm_memory_slot old, new;
690 int memory_config_version;
691
692 r = -EINVAL;
693 /* General sanity checks */
694 if (mem->memory_size & (PAGE_SIZE - 1))
695 goto out;
696 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
697 goto out;
698 if (mem->slot >= KVM_MEMORY_SLOTS)
699 goto out;
700 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
701 goto out;
702
703 memslot = &kvm->memslots[mem->slot];
704 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
705 npages = mem->memory_size >> PAGE_SHIFT;
706
707 if (!npages)
708 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
709
710raced:
711 spin_lock(&kvm->lock);
712
713 memory_config_version = kvm->memory_config_version;
714 new = old = *memslot;
715
716 new.base_gfn = base_gfn;
717 new.npages = npages;
718 new.flags = mem->flags;
719
720 /* Disallow changing a memory slot's size. */
721 r = -EINVAL;
722 if (npages && old.npages && npages != old.npages)
723 goto out_unlock;
724
725 /* Check for overlaps */
726 r = -EEXIST;
727 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
728 struct kvm_memory_slot *s = &kvm->memslots[i];
729
730 if (s == memslot)
731 continue;
732 if (!((base_gfn + npages <= s->base_gfn) ||
733 (base_gfn >= s->base_gfn + s->npages)))
734 goto out_unlock;
735 }
736 /*
737 * Do memory allocations outside lock. memory_config_version will
738 * detect any races.
739 */
740 spin_unlock(&kvm->lock);
741
742 /* Deallocate if slot is being removed */
743 if (!npages)
8b6d44c7 744 new.phys_mem = NULL;
6aa8b732
AK		 745
746 /* Free page dirty bitmap if unneeded */
747 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
8b6d44c7 748 new.dirty_bitmap = NULL;
6aa8b732
AK		 749
750 r = -ENOMEM;
751
752 /* Allocate if a slot is being created */
753 if (npages && !new.phys_mem) {
754 new.phys_mem = vmalloc(npages * sizeof(struct page *));
755
756 if (!new.phys_mem)
757 goto out_free;
758
759 memset(new.phys_mem, 0, npages * sizeof(struct page *));
760 for (i = 0; i < npages; ++i) {
761 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
762 | __GFP_ZERO);
763 if (!new.phys_mem[i])
764 goto out_free;
5972e953 765 set_page_private(new.phys_mem[i],0);
6aa8b732
AK		 766 }
767 }
768
769 /* Allocate page dirty bitmap if needed */
770 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
771 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
772
773 new.dirty_bitmap = vmalloc(dirty_bytes);
774 if (!new.dirty_bitmap)
775 goto out_free;
776 memset(new.dirty_bitmap, 0, dirty_bytes);
777 }
778
779 spin_lock(&kvm->lock);
780
781 if (memory_config_version != kvm->memory_config_version) {
782 spin_unlock(&kvm->lock);
783 kvm_free_physmem_slot(&new, &old);
784 goto raced;
785 }
786
787 r = -EAGAIN;
788 if (kvm->busy)
789 goto out_unlock;
790
791 if (mem->slot >= kvm->nmemslots)
792 kvm->nmemslots = mem->slot + 1;
793
794 *memslot = new;
795 ++kvm->memory_config_version;
796
797 spin_unlock(&kvm->lock);
798
799 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
800 struct kvm_vcpu *vcpu;
801
bccf2150 802 vcpu = vcpu_load_slot(kvm, i);
6aa8b732
AK		 803 if (!vcpu)
804 continue;
ff990d59
UL		 805 if (new.flags & KVM_MEM_LOG_DIRTY_PAGES)
806 do_remove_write_access(vcpu, mem->slot);
6aa8b732
AK		 807 kvm_mmu_reset_context(vcpu);
808 vcpu_put(vcpu);
809 }
810
811 kvm_free_physmem_slot(&old, &new);
812 return 0;
813
814out_unlock:
815 spin_unlock(&kvm->lock);
816out_free:
817 kvm_free_physmem_slot(&new, &old);
818out:
819 return r;
820}
821
822/*
823 * Get (and clear) the dirty memory log for a memory slot.
824 */
2c6f5df9
AK		 825static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
826 struct kvm_dirty_log *log)
6aa8b732
AK		 827{
828 struct kvm_memory_slot *memslot;
829 int r, i;
830 int n;
714b93da 831 int cleared;
6aa8b732
AK		 832 unsigned long any = 0;
833
834 spin_lock(&kvm->lock);
835
836 /*
837 * Prevent changes to guest memory configuration even while the lock
838 * is not taken.
839 */
840 ++kvm->busy;
841 spin_unlock(&kvm->lock);
842 r = -EINVAL;
843 if (log->slot >= KVM_MEMORY_SLOTS)
844 goto out;
845
846 memslot = &kvm->memslots[log->slot];
847 r = -ENOENT;
848 if (!memslot->dirty_bitmap)
849 goto out;
850
cd1a4a98 851 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
6aa8b732 852
cd1a4a98 853 for (i = 0; !any && i < n/sizeof(long); ++i)
6aa8b732
AK		 854 any = memslot->dirty_bitmap[i];
855
856 r = -EFAULT;
857 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
858 goto out;
859
6aa8b732 860 if (any) {
714b93da 861 cleared = 0;
6aa8b732 862 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
bccf2150 863 struct kvm_vcpu *vcpu;
6aa8b732 864
bccf2150 865 vcpu = vcpu_load_slot(kvm, i);
6aa8b732
AK		 866 if (!vcpu)
867 continue;
714b93da
AK		 868 if (!cleared) {
869 do_remove_write_access(vcpu, log->slot);
870 memset(memslot->dirty_bitmap, 0, n);
871 cleared = 1;
872 }
6aa8b732
AK		 873 kvm_arch_ops->tlb_flush(vcpu);
874 vcpu_put(vcpu);
875 }
876 }
877
878 r = 0;
879
880out:
881 spin_lock(&kvm->lock);
882 --kvm->busy;
883 spin_unlock(&kvm->lock);
884 return r;
885}
886
e8207547
AK		 887/*
888 * Set a new alias region. Aliases map a portion of physical memory into
889 * another portion. This is useful for memory windows, for example the PC
890 * VGA region.
891 */
892static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
893 struct kvm_memory_alias *alias)
894{
895 int r, n;
896 struct kvm_mem_alias *p;
897
898 r = -EINVAL;
899 /* General sanity checks */
900 if (alias->memory_size & (PAGE_SIZE - 1))
901 goto out;
902 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
903 goto out;
904 if (alias->slot >= KVM_ALIAS_SLOTS)
905 goto out;
906 if (alias->guest_phys_addr + alias->memory_size
907 < alias->guest_phys_addr)
908 goto out;
909 if (alias->target_phys_addr + alias->memory_size
910 < alias->target_phys_addr)
911 goto out;
912
913 spin_lock(&kvm->lock);
914
915 p = &kvm->aliases[alias->slot];
916 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
917 p->npages = alias->memory_size >> PAGE_SHIFT;
918 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
919
920 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
921 if (kvm->aliases[n - 1].npages)
922 break;
923 kvm->naliases = n;
924
925 spin_unlock(&kvm->lock);
926
927 vcpu_load(&kvm->vcpus[0]);
928 spin_lock(&kvm->lock);
929 kvm_mmu_zap_all(&kvm->vcpus[0]);
930 spin_unlock(&kvm->lock);
931 vcpu_put(&kvm->vcpus[0]);
932
933 return 0;
934
935out:
936 return r;
937}
938
939static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
940{
941 int i;
942 struct kvm_mem_alias *alias;
943
944 for (i = 0; i < kvm->naliases; ++i) {
945 alias = &kvm->aliases[i];
946 if (gfn >= alias->base_gfn
947 && gfn < alias->base_gfn + alias->npages)
948 return alias->target_gfn + gfn - alias->base_gfn;
949 }
950 return gfn;
951}
952
953static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
6aa8b732
AK		 954{
955 int i;
956
957 for (i = 0; i < kvm->nmemslots; ++i) {
958 struct kvm_memory_slot *memslot = &kvm->memslots[i];
959
960 if (gfn >= memslot->base_gfn
961 && gfn < memslot->base_gfn + memslot->npages)
962 return memslot;
963 }
8b6d44c7 964 return NULL;
6aa8b732 965}
e8207547
AK		 966
967struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
968{
969 gfn = unalias_gfn(kvm, gfn);
970 return __gfn_to_memslot(kvm, gfn);
971}
6aa8b732 972
954bbbc2
AK		 973struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
974{
975 struct kvm_memory_slot *slot;
976
e8207547
AK		 977 gfn = unalias_gfn(kvm, gfn);
978 slot = __gfn_to_memslot(kvm, gfn);
954bbbc2
AK		 979 if (!slot)
980 return NULL;
981 return slot->phys_mem[gfn - slot->base_gfn];
982}
983EXPORT_SYMBOL_GPL(gfn_to_page);
984
6aa8b732
AK		 985void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
986{
987 int i;
31389947 988 struct kvm_memory_slot *memslot;
6aa8b732
AK		 989 unsigned long rel_gfn;
990
991 for (i = 0; i < kvm->nmemslots; ++i) {
992 memslot = &kvm->memslots[i];
993
994 if (gfn >= memslot->base_gfn
995 && gfn < memslot->base_gfn + memslot->npages) {
996
31389947 997 if (!memslot->dirty_bitmap)
6aa8b732
AK		 998 return;
999
1000 rel_gfn = gfn - memslot->base_gfn;
1001
1002 /* avoid RMW */
1003 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
1004 set_bit(rel_gfn, memslot->dirty_bitmap);
1005 return;
1006 }
1007 }
1008}
1009
1010static int emulator_read_std(unsigned long addr,
4c690a1e 1011 void *val,
6aa8b732
AK		 1012 unsigned int bytes,
1013 struct x86_emulate_ctxt *ctxt)
1014{
1015 struct kvm_vcpu *vcpu = ctxt->vcpu;
1016 void *data = val;
1017
1018 while (bytes) {
1019 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1020 unsigned offset = addr & (PAGE_SIZE-1);
1021 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1022 unsigned long pfn;
954bbbc2
AK		 1023 struct page *page;
1024 void *page_virt;
6aa8b732
AK		 1025
1026 if (gpa == UNMAPPED_GVA)
1027 return X86EMUL_PROPAGATE_FAULT;
1028 pfn = gpa >> PAGE_SHIFT;
954bbbc2
AK		 1029 page = gfn_to_page(vcpu->kvm, pfn);
1030 if (!page)
6aa8b732 1031 return X86EMUL_UNHANDLEABLE;
954bbbc2 1032 page_virt = kmap_atomic(page, KM_USER0);
6aa8b732 1033
954bbbc2 1034 memcpy(data, page_virt + offset, tocopy);
6aa8b732 1035
954bbbc2 1036 kunmap_atomic(page_virt, KM_USER0);
6aa8b732
AK		 1037
1038 bytes -= tocopy;
1039 data += tocopy;
1040 addr += tocopy;
1041 }
1042
1043 return X86EMUL_CONTINUE;
1044}
1045
1046static int emulator_write_std(unsigned long addr,
4c690a1e 1047 const void *val,
6aa8b732
AK		 1048 unsigned int bytes,
1049 struct x86_emulate_ctxt *ctxt)
1050{
1051 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
1052 addr, bytes);
1053 return X86EMUL_UNHANDLEABLE;
1054}
1055
1056static int emulator_read_emulated(unsigned long addr,
4c690a1e 1057 void *val,
6aa8b732
AK		 1058 unsigned int bytes,
1059 struct x86_emulate_ctxt *ctxt)
1060{
1061 struct kvm_vcpu *vcpu = ctxt->vcpu;
1062
1063 if (vcpu->mmio_read_completed) {
1064 memcpy(val, vcpu->mmio_data, bytes);
1065 vcpu->mmio_read_completed = 0;
1066 return X86EMUL_CONTINUE;
1067 } else if (emulator_read_std(addr, val, bytes, ctxt)
1068 == X86EMUL_CONTINUE)
1069 return X86EMUL_CONTINUE;
1070 else {
1071 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
d27d4aca 1072
6aa8b732 1073 if (gpa == UNMAPPED_GVA)
d27d4aca 1074 return X86EMUL_PROPAGATE_FAULT;
6aa8b732
AK		 1075 vcpu->mmio_needed = 1;
1076 vcpu->mmio_phys_addr = gpa;
1077 vcpu->mmio_size = bytes;
1078 vcpu->mmio_is_write = 0;
1079
1080 return X86EMUL_UNHANDLEABLE;
1081 }
1082}
1083
da4a00f0 1084static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
4c690a1e 1085 const void *val, int bytes)
da4a00f0 1086{
da4a00f0
AK		 1087 struct page *page;
1088 void *virt;
09072daf 1089 unsigned offset = offset_in_page(gpa);
da4a00f0
AK		 1090
1091 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
1092 return 0;
954bbbc2
AK		 1093 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1094 if (!page)
da4a00f0 1095 return 0;
ab51a434 1096 mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
da4a00f0 1097 virt = kmap_atomic(page, KM_USER0);
09072daf 1098 kvm_mmu_pte_write(vcpu, gpa, virt + offset, val, bytes);
4c690a1e 1099 memcpy(virt + offset_in_page(gpa), val, bytes);
da4a00f0 1100 kunmap_atomic(virt, KM_USER0);
da4a00f0
AK		 1101 return 1;
1102}
1103
6aa8b732 1104static int emulator_write_emulated(unsigned long addr,
4c690a1e 1105 const void *val,
6aa8b732
AK		 1106 unsigned int bytes,
1107 struct x86_emulate_ctxt *ctxt)
1108{
1109 struct kvm_vcpu *vcpu = ctxt->vcpu;
1110 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1111
c9047f53
AK		 1112 if (gpa == UNMAPPED_GVA) {
1113 kvm_arch_ops->inject_page_fault(vcpu, addr, 2);
6aa8b732 1114 return X86EMUL_PROPAGATE_FAULT;
c9047f53 1115 }
6aa8b732 1116
da4a00f0
AK		 1117 if (emulator_write_phys(vcpu, gpa, val, bytes))
1118 return X86EMUL_CONTINUE;
1119
6aa8b732
AK		 1120 vcpu->mmio_needed = 1;
1121 vcpu->mmio_phys_addr = gpa;
1122 vcpu->mmio_size = bytes;
1123 vcpu->mmio_is_write = 1;
4c690a1e 1124 memcpy(vcpu->mmio_data, val, bytes);
6aa8b732
AK		 1125
1126 return X86EMUL_CONTINUE;
1127}
1128
1129static int emulator_cmpxchg_emulated(unsigned long addr,
4c690a1e
AK		 1130 const void *old,
1131 const void *new,
6aa8b732
AK		 1132 unsigned int bytes,
1133 struct x86_emulate_ctxt *ctxt)
1134{
1135 static int reported;
1136
1137 if (!reported) {
1138 reported = 1;
1139 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1140 }
1141 return emulator_write_emulated(addr, new, bytes, ctxt);
1142}
1143
1144static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1145{
1146 return kvm_arch_ops->get_segment_base(vcpu, seg);
1147}
1148
1149int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1150{
6aa8b732
AK		 1151 return X86EMUL_CONTINUE;
1152}
1153
1154int emulate_clts(struct kvm_vcpu *vcpu)
1155{
399badf3 1156 unsigned long cr0;
6aa8b732 1157
399badf3 1158 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
6aa8b732
AK		 1159 kvm_arch_ops->set_cr0(vcpu, cr0);
1160 return X86EMUL_CONTINUE;
1161}
1162
1163int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1164{
1165 struct kvm_vcpu *vcpu = ctxt->vcpu;
1166
1167 switch (dr) {
1168 case 0 ... 3:
1169 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1170 return X86EMUL_CONTINUE;
1171 default:
1172 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1173 __FUNCTION__, dr);
1174 return X86EMUL_UNHANDLEABLE;
1175 }
1176}
1177
1178int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1179{
1180 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1181 int exception;
1182
1183 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1184 if (exception) {
1185 /* FIXME: better handling */
1186 return X86EMUL_UNHANDLEABLE;
1187 }
1188 return X86EMUL_CONTINUE;
1189}
1190
1191static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1192{
1193 static int reported;
1194 u8 opcodes[4];
1195 unsigned long rip = ctxt->vcpu->rip;
1196 unsigned long rip_linear;
1197
1198 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1199
1200 if (reported)
1201 return;
1202
1203 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1204
1205 printk(KERN_ERR "emulation failed but !mmio_needed?"
1206 " rip %lx %02x %02x %02x %02x\n",
1207 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1208 reported = 1;
1209}
1210
1211struct x86_emulate_ops emulate_ops = {
1212 .read_std = emulator_read_std,
1213 .write_std = emulator_write_std,
1214 .read_emulated = emulator_read_emulated,
1215 .write_emulated = emulator_write_emulated,
1216 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1217};
1218
1219int emulate_instruction(struct kvm_vcpu *vcpu,
1220 struct kvm_run *run,
1221 unsigned long cr2,
1222 u16 error_code)
1223{
1224 struct x86_emulate_ctxt emulate_ctxt;
1225 int r;
1226 int cs_db, cs_l;
1227
e7df56e4 1228 vcpu->mmio_fault_cr2 = cr2;
6aa8b732
AK		 1229 kvm_arch_ops->cache_regs(vcpu);
1230
1231 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1232
1233 emulate_ctxt.vcpu = vcpu;
1234 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1235 emulate_ctxt.cr2 = cr2;
1236 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1237 ? X86EMUL_MODE_REAL : cs_l
1238 ? X86EMUL_MODE_PROT64 : cs_db
1239 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1240
1241 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1242 emulate_ctxt.cs_base = 0;
1243 emulate_ctxt.ds_base = 0;
1244 emulate_ctxt.es_base = 0;
1245 emulate_ctxt.ss_base = 0;
1246 } else {
1247 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1248 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1249 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1250 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1251 }
1252
1253 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1254 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1255
1256 vcpu->mmio_is_write = 0;
1257 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1258
1259 if ((r || vcpu->mmio_is_write) && run) {
1260 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1261 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1262 run->mmio.len = vcpu->mmio_size;
1263 run->mmio.is_write = vcpu->mmio_is_write;
1264 }
1265
1266 if (r) {
a436036b
AK		 1267 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1268 return EMULATE_DONE;
6aa8b732
AK		 1269 if (!vcpu->mmio_needed) {
1270 report_emulation_failure(&emulate_ctxt);
1271 return EMULATE_FAIL;
1272 }
1273 return EMULATE_DO_MMIO;
1274 }
1275
1276 kvm_arch_ops->decache_regs(vcpu);
1277 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1278
02c83209
AK		 1279 if (vcpu->mmio_is_write) {
1280 vcpu->mmio_needed = 0;
6aa8b732 1281 return EMULATE_DO_MMIO;
02c83209 1282 }
6aa8b732
AK		 1283
1284 return EMULATE_DONE;
1285}
1286EXPORT_SYMBOL_GPL(emulate_instruction);
1287
d3bef15f
AK		 1288int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1289{
1290 if (vcpu->irq_summary)
1291 return 1;
1292
1293 vcpu->run->exit_reason = KVM_EXIT_HLT;
1294 ++vcpu->stat.halt_exits;
1295 return 0;
1296}
1297EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1298
270fd9b9
AK		 1299int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1300{
1301 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1302
9b22bf57 1303 kvm_arch_ops->cache_regs(vcpu);
270fd9b9
AK		 1304 ret = -KVM_EINVAL;
1305#ifdef CONFIG_X86_64
1306 if (is_long_mode(vcpu)) {
1307 nr = vcpu->regs[VCPU_REGS_RAX];
1308 a0 = vcpu->regs[VCPU_REGS_RDI];
1309 a1 = vcpu->regs[VCPU_REGS_RSI];
1310 a2 = vcpu->regs[VCPU_REGS_RDX];
1311 a3 = vcpu->regs[VCPU_REGS_RCX];
1312 a4 = vcpu->regs[VCPU_REGS_R8];
1313 a5 = vcpu->regs[VCPU_REGS_R9];
1314 } else
1315#endif
1316 {
1317 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1318 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1319 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1320 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1321 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1322 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1323 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1324 }
1325 switch (nr) {
1326 default:
b4e63f56
AK		 1327 run->hypercall.args[0] = a0;
1328 run->hypercall.args[1] = a1;
1329 run->hypercall.args[2] = a2;
1330 run->hypercall.args[3] = a3;
1331 run->hypercall.args[4] = a4;
1332 run->hypercall.args[5] = a5;
1333 run->hypercall.ret = ret;
1334 run->hypercall.longmode = is_long_mode(vcpu);
1335 kvm_arch_ops->decache_regs(vcpu);
1336 return 0;
270fd9b9
AK		 1337 }
1338 vcpu->regs[VCPU_REGS_RAX] = ret;
9b22bf57 1339 kvm_arch_ops->decache_regs(vcpu);
270fd9b9
AK		 1340 return 1;
1341}
1342EXPORT_SYMBOL_GPL(kvm_hypercall);
1343
6aa8b732
AK		 1344static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1345{
1346 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1347}
1348
1349void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1350{
1351 struct descriptor_table dt = { limit, base };
1352
1353 kvm_arch_ops->set_gdt(vcpu, &dt);
1354}
1355
1356void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1357{
1358 struct descriptor_table dt = { limit, base };
1359
1360 kvm_arch_ops->set_idt(vcpu, &dt);
1361}
1362
1363void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1364 unsigned long *rflags)
1365{
1366 lmsw(vcpu, msw);
1367 *rflags = kvm_arch_ops->get_rflags(vcpu);
1368}
1369
1370unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1371{
25c4c276 1372 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 1373 switch (cr) {
1374 case 0:
1375 return vcpu->cr0;
1376 case 2:
1377 return vcpu->cr2;
1378 case 3:
1379 return vcpu->cr3;
1380 case 4:
1381 return vcpu->cr4;
1382 default:
1383 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1384 return 0;
1385 }
1386}
1387
1388void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1389 unsigned long *rflags)
1390{
1391 switch (cr) {
1392 case 0:
1393 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1394 *rflags = kvm_arch_ops->get_rflags(vcpu);
1395 break;
1396 case 2:
1397 vcpu->cr2 = val;
1398 break;
1399 case 3:
1400 set_cr3(vcpu, val);
1401 break;
1402 case 4:
1403 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1404 break;
1405 default:
1406 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1407 }
1408}
1409
102d8325
IM		 1410/*
1411 * Register the para guest with the host:
1412 */
1413static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1414{
1415 struct kvm_vcpu_para_state *para_state;
1416 hpa_t para_state_hpa, hypercall_hpa;
1417 struct page *para_state_page;
1418 unsigned char *hypercall;
1419 gpa_t hypercall_gpa;
1420
1421 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1422 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1423
1424 /*
1425 * Needs to be page aligned:
1426 */
1427 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1428 goto err_gp;
1429
1430 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1431 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1432 if (is_error_hpa(para_state_hpa))
1433 goto err_gp;
1434
ab51a434 1435 mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
102d8325
IM		 1436 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1437 para_state = kmap_atomic(para_state_page, KM_USER0);
1438
1439 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1440 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1441
1442 para_state->host_version = KVM_PARA_API_VERSION;
1443 /*
1444 * We cannot support guests that try to register themselves
1445 * with a newer API version than the host supports:
1446 */
1447 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1448 para_state->ret = -KVM_EINVAL;
1449 goto err_kunmap_skip;
1450 }
1451
1452 hypercall_gpa = para_state->hypercall_gpa;
1453 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1454 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1455 if (is_error_hpa(hypercall_hpa)) {
1456 para_state->ret = -KVM_EINVAL;
1457 goto err_kunmap_skip;
1458 }
1459
1460 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1461 vcpu->para_state_page = para_state_page;
1462 vcpu->para_state_gpa = para_state_gpa;
1463 vcpu->hypercall_gpa = hypercall_gpa;
1464
ab51a434 1465 mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
102d8325
IM		 1466 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1467 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1468 kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1469 kunmap_atomic(hypercall, KM_USER1);
1470
1471 para_state->ret = 0;
1472err_kunmap_skip:
1473 kunmap_atomic(para_state, KM_USER0);
1474 return 0;
1475err_gp:
1476 return 1;
1477}
1478
3bab1f5d
AK		 1479int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1480{
1481 u64 data;
1482
1483 switch (msr) {
1484 case 0xc0010010: /* SYSCFG */
1485 case 0xc0010015: /* HWCR */
1486 case MSR_IA32_PLATFORM_ID:
1487 case MSR_IA32_P5_MC_ADDR:
1488 case MSR_IA32_P5_MC_TYPE:
1489 case MSR_IA32_MC0_CTL:
1490 case MSR_IA32_MCG_STATUS:
1491 case MSR_IA32_MCG_CAP:
1492 case MSR_IA32_MC0_MISC:
1493 case MSR_IA32_MC0_MISC+4:
1494 case MSR_IA32_MC0_MISC+8:
1495 case MSR_IA32_MC0_MISC+12:
1496 case MSR_IA32_MC0_MISC+16:
1497 case MSR_IA32_UCODE_REV:
a8d13ea2 1498 case MSR_IA32_PERF_STATUS:
2dc7094b 1499 case MSR_IA32_EBL_CR_POWERON:
3bab1f5d
AK		 1500 /* MTRR registers */
1501 case 0xfe:
1502 case 0x200 ... 0x2ff:
1503 data = 0;
1504 break;
a8d13ea2
AK		 1505 case 0xcd: /* fsb frequency */
1506 data = 3;
1507 break;
3bab1f5d
AK		 1508 case MSR_IA32_APICBASE:
1509 data = vcpu->apic_base;
1510 break;
6f00e68f
AK		 1511 case MSR_IA32_MISC_ENABLE:
1512 data = vcpu->ia32_misc_enable_msr;
1513 break;
3bab1f5d
AK		 1514#ifdef CONFIG_X86_64
1515 case MSR_EFER:
1516 data = vcpu->shadow_efer;
1517 break;
1518#endif
1519 default:
1520 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1521 return 1;
1522 }
1523 *pdata = data;
1524 return 0;
1525}
1526EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1527
6aa8b732
AK		 1528/*
1529 * Reads an msr value (of 'msr_index') into 'pdata'.
1530 * Returns 0 on success, non-0 otherwise.
1531 * Assumes vcpu_load() was already called.
1532 */
1533static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1534{
1535 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1536}
1537
05b3e0c2 1538#ifdef CONFIG_X86_64
6aa8b732 1539
3bab1f5d 1540static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1541{
6aa8b732
AK		 1542 if (efer & EFER_RESERVED_BITS) {
1543 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1544 efer);
1545 inject_gp(vcpu);
1546 return;
1547 }
1548
1549 if (is_paging(vcpu)
1550 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1551 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1552 inject_gp(vcpu);
1553 return;
1554 }
1555
7725f0ba
AK		 1556 kvm_arch_ops->set_efer(vcpu, efer);
1557
6aa8b732
AK		 1558 efer &= ~EFER_LMA;
1559 efer |= vcpu->shadow_efer & EFER_LMA;
1560
1561 vcpu->shadow_efer = efer;
6aa8b732 1562}
6aa8b732
AK		 1563
1564#endif
1565
3bab1f5d
AK		 1566int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1567{
1568 switch (msr) {
1569#ifdef CONFIG_X86_64
1570 case MSR_EFER:
1571 set_efer(vcpu, data);
1572 break;
1573#endif
1574 case MSR_IA32_MC0_STATUS:
1575 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1576 __FUNCTION__, data);
1577 break;
0e5bf0d0
SK		 1578 case MSR_IA32_MCG_STATUS:
1579 printk(KERN_WARNING "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
1580 __FUNCTION__, data);
1581 break;
3bab1f5d
AK		 1582 case MSR_IA32_UCODE_REV:
1583 case MSR_IA32_UCODE_WRITE:
1584 case 0x200 ... 0x2ff: /* MTRRs */
1585 break;
1586 case MSR_IA32_APICBASE:
1587 vcpu->apic_base = data;
1588 break;
6f00e68f
AK		 1589 case MSR_IA32_MISC_ENABLE:
1590 vcpu->ia32_misc_enable_msr = data;
1591 break;
102d8325
IM		 1592 /*
1593 * This is the 'probe whether the host is KVM' logic:
1594 */
1595 case MSR_KVM_API_MAGIC:
1596 return vcpu_register_para(vcpu, data);
1597
3bab1f5d
AK		 1598 default:
1599 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1600 return 1;
1601 }
1602 return 0;
1603}
1604EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1605
6aa8b732
AK		 1606/*
1607 * Writes msr value into into the appropriate "register".
1608 * Returns 0 on success, non-0 otherwise.
1609 * Assumes vcpu_load() was already called.
1610 */
1611static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1612{
1613 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1614}
1615
1616void kvm_resched(struct kvm_vcpu *vcpu)
1617{
3fca0365
YD		 1618 if (!need_resched())
1619 return;
6aa8b732
AK		 1620 vcpu_put(vcpu);
1621 cond_resched();
bccf2150 1622 vcpu_load(vcpu);
6aa8b732
AK		 1623}
1624EXPORT_SYMBOL_GPL(kvm_resched);
1625
1626void load_msrs(struct vmx_msr_entry *e, int n)
1627{
1628 int i;
1629
1630 for (i = 0; i < n; ++i)
1631 wrmsrl(e[i].index, e[i].data);
1632}
1633EXPORT_SYMBOL_GPL(load_msrs);
1634
1635void save_msrs(struct vmx_msr_entry *e, int n)
1636{
1637 int i;
1638
1639 for (i = 0; i < n; ++i)
1640 rdmsrl(e[i].index, e[i].data);
1641}
1642EXPORT_SYMBOL_GPL(save_msrs);
1643
06465c5a
AK		 1644void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1645{
1646 int i;
1647 u32 function;
1648 struct kvm_cpuid_entry *e, *best;
1649
1650 kvm_arch_ops->cache_regs(vcpu);
1651 function = vcpu->regs[VCPU_REGS_RAX];
1652 vcpu->regs[VCPU_REGS_RAX] = 0;
1653 vcpu->regs[VCPU_REGS_RBX] = 0;
1654 vcpu->regs[VCPU_REGS_RCX] = 0;
1655 vcpu->regs[VCPU_REGS_RDX] = 0;
1656 best = NULL;
1657 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1658 e = &vcpu->cpuid_entries[i];
1659 if (e->function == function) {
1660 best = e;
1661 break;
1662 }
1663 /*
1664 * Both basic or both extended?
1665 */
1666 if (((e->function ^ function) & 0x80000000) == 0)
1667 if (!best || e->function > best->function)
1668 best = e;
1669 }
1670 if (best) {
1671 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1672 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1673 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1674 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1675 }
1676 kvm_arch_ops->decache_regs(vcpu);
1677 kvm_arch_ops->skip_emulated_instruction(vcpu);
1678}
1679EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1680
039576c0 1681static int pio_copy_data(struct kvm_vcpu *vcpu)
46fc1477 1682{
039576c0
AK		 1683 void *p = vcpu->pio_data;
1684 void *q;
1685 unsigned bytes;
1686 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1687
1688 kvm_arch_ops->vcpu_put(vcpu);
1689 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1690 PAGE_KERNEL);
1691 if (!q) {
1692 kvm_arch_ops->vcpu_load(vcpu);
1693 free_pio_guest_pages(vcpu);
1694 return -ENOMEM;
1695 }
1696 q += vcpu->pio.guest_page_offset;
1697 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1698 if (vcpu->pio.in)
1699 memcpy(q, p, bytes);
1700 else
1701 memcpy(p, q, bytes);
1702 q -= vcpu->pio.guest_page_offset;
1703 vunmap(q);
1704 kvm_arch_ops->vcpu_load(vcpu);
1705 free_pio_guest_pages(vcpu);
1706 return 0;
1707}
1708
1709static int complete_pio(struct kvm_vcpu *vcpu)
1710{
1711 struct kvm_pio_request *io = &vcpu->pio;
46fc1477 1712 long delta;
039576c0 1713 int r;
46fc1477
AK		 1714
1715 kvm_arch_ops->cache_regs(vcpu);
1716
1717 if (!io->string) {
039576c0
AK		 1718 if (io->in)
1719 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
46fc1477
AK		 1720 io->size);
1721 } else {
039576c0
AK		 1722 if (io->in) {
1723 r = pio_copy_data(vcpu);
1724 if (r) {
1725 kvm_arch_ops->cache_regs(vcpu);
1726 return r;
1727 }
1728 }
1729
46fc1477
AK		 1730 delta = 1;
1731 if (io->rep) {
039576c0 1732 delta *= io->cur_count;
46fc1477
AK		 1733 /*
1734 * The size of the register should really depend on
1735 * current address size.
1736 */
1737 vcpu->regs[VCPU_REGS_RCX] -= delta;
1738 }
039576c0 1739 if (io->down)
46fc1477
AK		 1740 delta = -delta;
1741 delta *= io->size;
039576c0 1742 if (io->in)
46fc1477
AK		 1743 vcpu->regs[VCPU_REGS_RDI] += delta;
1744 else
1745 vcpu->regs[VCPU_REGS_RSI] += delta;
1746 }
1747
46fc1477
AK		 1748 kvm_arch_ops->decache_regs(vcpu);
1749
039576c0
AK		 1750 io->count -= io->cur_count;
1751 io->cur_count = 0;
1752
1753 if (!io->count)
1754 kvm_arch_ops->skip_emulated_instruction(vcpu);
1755 return 0;
46fc1477
AK		 1756}
1757
039576c0
AK		 1758int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1759 int size, unsigned long count, int string, int down,
1760 gva_t address, int rep, unsigned port)
1761{
1762 unsigned now, in_page;
1763 int i;
1764 int nr_pages = 1;
1765 struct page *page;
1766
1767 vcpu->run->exit_reason = KVM_EXIT_IO;
1768 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1769 vcpu->run->io.size = size;
1770 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1771 vcpu->run->io.count = count;
1772 vcpu->run->io.port = port;
1773 vcpu->pio.count = count;
1774 vcpu->pio.cur_count = count;
1775 vcpu->pio.size = size;
1776 vcpu->pio.in = in;
1777 vcpu->pio.string = string;
1778 vcpu->pio.down = down;
1779 vcpu->pio.guest_page_offset = offset_in_page(address);
1780 vcpu->pio.rep = rep;
1781
1782 if (!string) {
1783 kvm_arch_ops->cache_regs(vcpu);
1784 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1785 kvm_arch_ops->decache_regs(vcpu);
1786 return 0;
1787 }
1788
1789 if (!count) {
1790 kvm_arch_ops->skip_emulated_instruction(vcpu);
1791 return 1;
1792 }
1793
1794 now = min(count, PAGE_SIZE / size);
1795
1796 if (!down)
1797 in_page = PAGE_SIZE - offset_in_page(address);
1798 else
1799 in_page = offset_in_page(address) + size;
1800 now = min(count, (unsigned long)in_page / size);
1801 if (!now) {
1802 /*
1803 * String I/O straddles page boundary. Pin two guest pages
1804 * so that we satisfy atomicity constraints. Do just one
1805 * transaction to avoid complexity.
1806 */
1807 nr_pages = 2;
1808 now = 1;
1809 }
1810 if (down) {
1811 /*
1812 * String I/O in reverse. Yuck. Kill the guest, fix later.
1813 */
1814 printk(KERN_ERR "kvm: guest string pio down\n");
1815 inject_gp(vcpu);
1816 return 1;
1817 }
1818 vcpu->run->io.count = now;
1819 vcpu->pio.cur_count = now;
1820
1821 for (i = 0; i < nr_pages; ++i) {
1822 spin_lock(&vcpu->kvm->lock);
1823 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1824 if (page)
1825 get_page(page);
1826 vcpu->pio.guest_pages[i] = page;
1827 spin_unlock(&vcpu->kvm->lock);
1828 if (!page) {
1829 inject_gp(vcpu);
1830 free_pio_guest_pages(vcpu);
1831 return 1;
1832 }
1833 }
1834
1835 if (!vcpu->pio.in)
1836 return pio_copy_data(vcpu);
1837 return 0;
1838}
1839EXPORT_SYMBOL_GPL(kvm_setup_pio);
1840
bccf2150 1841static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
6aa8b732 1842{
6aa8b732 1843 int r;
1961d276 1844 sigset_t sigsaved;
6aa8b732 1845
bccf2150 1846 vcpu_load(vcpu);
6aa8b732 1847
1961d276
AK		 1848 if (vcpu->sigset_active)
1849 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
1850
54810342
DL		 1851 /* re-sync apic's tpr */
1852 vcpu->cr8 = kvm_run->cr8;
1853
02c83209
AK		 1854 if (vcpu->pio.cur_count) {
1855 r = complete_pio(vcpu);
1856 if (r)
1857 goto out;
1858 }
1859
1860 if (vcpu->mmio_needed) {
1861 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1862 vcpu->mmio_read_completed = 1;
1863 vcpu->mmio_needed = 0;
1864 r = emulate_instruction(vcpu, kvm_run,
1865 vcpu->mmio_fault_cr2, 0);
1866 if (r == EMULATE_DO_MMIO) {
1867 /*
1868 * Read-modify-write. Back to userspace.
1869 */
1870 kvm_run->exit_reason = KVM_EXIT_MMIO;
1871 r = 0;
1872 goto out;
46fc1477 1873 }
6aa8b732
AK		 1874 }
1875
8eb7d334 1876 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
b4e63f56
AK		 1877 kvm_arch_ops->cache_regs(vcpu);
1878 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
1879 kvm_arch_ops->decache_regs(vcpu);
1880 }
1881
6aa8b732
AK		 1882 r = kvm_arch_ops->run(vcpu, kvm_run);
1883
039576c0 1884out:
1961d276
AK		 1885 if (vcpu->sigset_active)
1886 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1887
6aa8b732
AK		 1888 vcpu_put(vcpu);
1889 return r;
1890}
1891
bccf2150
AK		 1892static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
1893 struct kvm_regs *regs)
6aa8b732 1894{
bccf2150 1895 vcpu_load(vcpu);
6aa8b732
AK		 1896
1897 kvm_arch_ops->cache_regs(vcpu);
1898
1899 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1900 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1901 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1902 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1903 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1904 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1905 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1906 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1907#ifdef CONFIG_X86_64
6aa8b732
AK		 1908 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1909 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1910 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1911 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1912 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1913 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1914 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1915 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1916#endif
1917
1918 regs->rip = vcpu->rip;
1919 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1920
1921 /*
1922 * Don't leak debug flags in case they were set for guest debugging
1923 */
1924 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1925 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1926
1927 vcpu_put(vcpu);
1928
1929 return 0;
1930}
1931
bccf2150
AK		 1932static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
1933 struct kvm_regs *regs)
6aa8b732 1934{
bccf2150 1935 vcpu_load(vcpu);
6aa8b732
AK		 1936
1937 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1938 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1939 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1940 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1941 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1942 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1943 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1944 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1945#ifdef CONFIG_X86_64
6aa8b732
AK		 1946 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1947 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1948 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1949 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1950 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1951 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1952 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1953 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1954#endif
1955
1956 vcpu->rip = regs->rip;
1957 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1958
1959 kvm_arch_ops->decache_regs(vcpu);
1960
1961 vcpu_put(vcpu);
1962
1963 return 0;
1964}
1965
1966static void get_segment(struct kvm_vcpu *vcpu,
1967 struct kvm_segment *var, int seg)
1968{
1969 return kvm_arch_ops->get_segment(vcpu, var, seg);
1970}
1971
bccf2150
AK		 1972static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1973 struct kvm_sregs *sregs)
6aa8b732 1974{
6aa8b732
AK		 1975 struct descriptor_table dt;
1976
bccf2150 1977 vcpu_load(vcpu);
6aa8b732
AK		 1978
1979 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1980 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1981 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1982 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1983 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1984 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1985
1986 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1987 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1988
1989 kvm_arch_ops->get_idt(vcpu, &dt);
1990 sregs->idt.limit = dt.limit;
1991 sregs->idt.base = dt.base;
1992 kvm_arch_ops->get_gdt(vcpu, &dt);
1993 sregs->gdt.limit = dt.limit;
1994 sregs->gdt.base = dt.base;
1995
25c4c276 1996 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 1997 sregs->cr0 = vcpu->cr0;
1998 sregs->cr2 = vcpu->cr2;
1999 sregs->cr3 = vcpu->cr3;
2000 sregs->cr4 = vcpu->cr4;
2001 sregs->cr8 = vcpu->cr8;
2002 sregs->efer = vcpu->shadow_efer;
2003 sregs->apic_base = vcpu->apic_base;
2004
2005 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2006 sizeof sregs->interrupt_bitmap);
2007
2008 vcpu_put(vcpu);
2009
2010 return 0;
2011}
2012
2013static void set_segment(struct kvm_vcpu *vcpu,
2014 struct kvm_segment *var, int seg)
2015{
2016 return kvm_arch_ops->set_segment(vcpu, var, seg);
2017}
2018
bccf2150
AK		 2019static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2020 struct kvm_sregs *sregs)
6aa8b732 2021{
6aa8b732
AK		 2022 int mmu_reset_needed = 0;
2023 int i;
2024 struct descriptor_table dt;
2025
bccf2150 2026 vcpu_load(vcpu);
6aa8b732 2027
6aa8b732
AK		 2028 dt.limit = sregs->idt.limit;
2029 dt.base = sregs->idt.base;
2030 kvm_arch_ops->set_idt(vcpu, &dt);
2031 dt.limit = sregs->gdt.limit;
2032 dt.base = sregs->gdt.base;
2033 kvm_arch_ops->set_gdt(vcpu, &dt);
2034
2035 vcpu->cr2 = sregs->cr2;
2036 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2037 vcpu->cr3 = sregs->cr3;
2038
2039 vcpu->cr8 = sregs->cr8;
2040
2041 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 2042#ifdef CONFIG_X86_64
6aa8b732
AK		 2043 kvm_arch_ops->set_efer(vcpu, sregs->efer);
2044#endif
2045 vcpu->apic_base = sregs->apic_base;
2046
25c4c276 2047 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
399badf3 2048
6aa8b732 2049 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
f6528b03 2050 kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
6aa8b732
AK		 2051
2052 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2053 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 2054 if (!is_long_mode(vcpu) && is_pae(vcpu))
2055 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 2056
2057 if (mmu_reset_needed)
2058 kvm_mmu_reset_context(vcpu);
2059
2060 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2061 sizeof vcpu->irq_pending);
2062 vcpu->irq_summary = 0;
2063 for (i = 0; i < NR_IRQ_WORDS; ++i)
2064 if (vcpu->irq_pending[i])
2065 __set_bit(i, &vcpu->irq_summary);
2066
024aa1c0
AK		 2067 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2068 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2069 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2070 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2071 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2072 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2073
2074 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2075 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2076
6aa8b732
AK		 2077 vcpu_put(vcpu);
2078
2079 return 0;
2080}
2081
2082/*
2083 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2084 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 2085 *
2086 * This list is modified at module load time to reflect the
2087 * capabilities of the host cpu.
6aa8b732
AK		 2088 */
2089static u32 msrs_to_save[] = {
2090 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2091 MSR_K6_STAR,
05b3e0c2 2092#ifdef CONFIG_X86_64
6aa8b732
AK		 2093 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2094#endif
2095 MSR_IA32_TIME_STAMP_COUNTER,
2096};
2097
bf591b24
MR		 2098static unsigned num_msrs_to_save;
2099
6f00e68f
AK		 2100static u32 emulated_msrs[] = {
2101 MSR_IA32_MISC_ENABLE,
2102};
2103
bf591b24
MR		 2104static __init void kvm_init_msr_list(void)
2105{
2106 u32 dummy[2];
2107 unsigned i, j;
2108
2109 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2110 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2111 continue;
2112 if (j < i)
2113 msrs_to_save[j] = msrs_to_save[i];
2114 j++;
2115 }
2116 num_msrs_to_save = j;
2117}
6aa8b732
AK		 2118
2119/*
2120 * Adapt set_msr() to msr_io()'s calling convention
2121 */
2122static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2123{
2124 return set_msr(vcpu, index, *data);
2125}
2126
2127/*
2128 * Read or write a bunch of msrs. All parameters are kernel addresses.
2129 *
2130 * @return number of msrs set successfully.
2131 */
bccf2150 2132static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
6aa8b732
AK		 2133 struct kvm_msr_entry *entries,
2134 int (*do_msr)(struct kvm_vcpu *vcpu,
2135 unsigned index, u64 *data))
2136{
6aa8b732
AK		 2137 int i;
2138
bccf2150 2139 vcpu_load(vcpu);
6aa8b732
AK		 2140
2141 for (i = 0; i < msrs->nmsrs; ++i)
2142 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2143 break;
2144
2145 vcpu_put(vcpu);
2146
2147 return i;
2148}
2149
2150/*
2151 * Read or write a bunch of msrs. Parameters are user addresses.
2152 *
2153 * @return number of msrs set successfully.
2154 */
bccf2150 2155static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
6aa8b732
AK		 2156 int (*do_msr)(struct kvm_vcpu *vcpu,
2157 unsigned index, u64 *data),
2158 int writeback)
2159{
2160 struct kvm_msrs msrs;
2161 struct kvm_msr_entry *entries;
2162 int r, n;
2163 unsigned size;
2164
2165 r = -EFAULT;
2166 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2167 goto out;
2168
2169 r = -E2BIG;
2170 if (msrs.nmsrs >= MAX_IO_MSRS)
2171 goto out;
2172
2173 r = -ENOMEM;
2174 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2175 entries = vmalloc(size);
2176 if (!entries)
2177 goto out;
2178
2179 r = -EFAULT;
2180 if (copy_from_user(entries, user_msrs->entries, size))
2181 goto out_free;
2182
bccf2150 2183 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
6aa8b732
AK		 2184 if (r < 0)
2185 goto out_free;
2186
2187 r = -EFAULT;
2188 if (writeback && copy_to_user(user_msrs->entries, entries, size))
2189 goto out_free;
2190
2191 r = n;
2192
2193out_free:
2194 vfree(entries);
2195out:
2196 return r;
2197}
2198
2199/*
2200 * Translate a guest virtual address to a guest physical address.
2201 */
bccf2150
AK		 2202static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2203 struct kvm_translation *tr)
6aa8b732
AK		 2204{
2205 unsigned long vaddr = tr->linear_address;
6aa8b732
AK		 2206 gpa_t gpa;
2207
bccf2150
AK		 2208 vcpu_load(vcpu);
2209 spin_lock(&vcpu->kvm->lock);
6aa8b732
AK		 2210 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2211 tr->physical_address = gpa;
2212 tr->valid = gpa != UNMAPPED_GVA;
2213 tr->writeable = 1;
2214 tr->usermode = 0;
bccf2150 2215 spin_unlock(&vcpu->kvm->lock);
6aa8b732
AK		 2216 vcpu_put(vcpu);
2217
2218 return 0;
2219}
2220
bccf2150
AK		 2221static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2222 struct kvm_interrupt *irq)
6aa8b732 2223{
6aa8b732
AK		 2224 if (irq->irq < 0 || irq->irq >= 256)
2225 return -EINVAL;
bccf2150 2226 vcpu_load(vcpu);
6aa8b732
AK		 2227
2228 set_bit(irq->irq, vcpu->irq_pending);
2229 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2230
2231 vcpu_put(vcpu);
2232
2233 return 0;
2234}
2235
bccf2150
AK		 2236static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2237 struct kvm_debug_guest *dbg)
6aa8b732 2238{
6aa8b732
AK		 2239 int r;
2240
bccf2150 2241 vcpu_load(vcpu);
6aa8b732
AK		 2242
2243 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
2244
2245 vcpu_put(vcpu);
2246
2247 return r;
2248}
2249
9a2bb7f4
AK		 2250static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2251 unsigned long address,
2252 int *type)
2253{
2254 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2255 unsigned long pgoff;
2256 struct page *page;
2257
2258 *type = VM_FAULT_MINOR;
2259 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
039576c0
AK		 2260 if (pgoff == 0)
2261 page = virt_to_page(vcpu->run);
2262 else if (pgoff == KVM_PIO_PAGE_OFFSET)
2263 page = virt_to_page(vcpu->pio_data);
2264 else
9a2bb7f4 2265 return NOPAGE_SIGBUS;
9a2bb7f4
AK		 2266 get_page(page);
2267 return page;
2268}
2269
2270static struct vm_operations_struct kvm_vcpu_vm_ops = {
2271 .nopage = kvm_vcpu_nopage,
2272};
2273
2274static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2275{
2276 vma->vm_ops = &kvm_vcpu_vm_ops;
2277 return 0;
2278}
2279
bccf2150
AK		 2280static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2281{
2282 struct kvm_vcpu *vcpu = filp->private_data;
2283
2284 fput(vcpu->kvm->filp);
2285 return 0;
2286}
2287
2288static struct file_operations kvm_vcpu_fops = {
2289 .release = kvm_vcpu_release,
2290 .unlocked_ioctl = kvm_vcpu_ioctl,
2291 .compat_ioctl = kvm_vcpu_ioctl,
9a2bb7f4 2292 .mmap = kvm_vcpu_mmap,
bccf2150
AK		 2293};
2294
2295/*
2296 * Allocates an inode for the vcpu.
2297 */
2298static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2299{
2300 int fd, r;
2301 struct inode *inode;
2302 struct file *file;
2303
2304 atomic_inc(&vcpu->kvm->filp->f_count);
2305 inode = kvmfs_inode(&kvm_vcpu_fops);
2306 if (IS_ERR(inode)) {
2307 r = PTR_ERR(inode);
2308 goto out1;
2309 }
2310
2311 file = kvmfs_file(inode, vcpu);
2312 if (IS_ERR(file)) {
2313 r = PTR_ERR(file);
2314 goto out2;
2315 }
2316
2317 r = get_unused_fd();
2318 if (r < 0)
2319 goto out3;
2320 fd = r;
2321 fd_install(fd, file);
2322
2323 return fd;
2324
2325out3:
2326 fput(file);
2327out2:
2328 iput(inode);
2329out1:
2330 fput(vcpu->kvm->filp);
2331 return r;
2332}
2333
c5ea7660
AK		 2334/*
2335 * Creates some virtual cpus. Good luck creating more than one.
2336 */
2337static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2338{
2339 int r;
2340 struct kvm_vcpu *vcpu;
9a2bb7f4 2341 struct page *page;
c5ea7660
AK		 2342
2343 r = -EINVAL;
2344 if (!valid_vcpu(n))
2345 goto out;
2346
2347 vcpu = &kvm->vcpus[n];
2348
2349 mutex_lock(&vcpu->mutex);
2350
2351 if (vcpu->vmcs) {
2352 mutex_unlock(&vcpu->mutex);
2353 return -EEXIST;
2354 }
2355
9a2bb7f4
AK		 2356 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2357 r = -ENOMEM;
2358 if (!page)
2359 goto out_unlock;
2360 vcpu->run = page_address(page);
2361
039576c0
AK		 2362 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2363 r = -ENOMEM;
2364 if (!page)
2365 goto out_free_run;
2366 vcpu->pio_data = page_address(page);
2367
c5ea7660
AK		 2368 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
2369 FX_IMAGE_ALIGN);
2370 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
d917a6b9 2371 vcpu->cr0 = 0x10;
c5ea7660
AK		 2372
2373 r = kvm_arch_ops->vcpu_create(vcpu);
2374 if (r < 0)
2375 goto out_free_vcpus;
2376
2377 r = kvm_mmu_create(vcpu);
2378 if (r < 0)
2379 goto out_free_vcpus;
2380
2381 kvm_arch_ops->vcpu_load(vcpu);
2382 r = kvm_mmu_setup(vcpu);
2383 if (r >= 0)
2384 r = kvm_arch_ops->vcpu_setup(vcpu);
2385 vcpu_put(vcpu);
2386
2387 if (r < 0)
2388 goto out_free_vcpus;
2389
bccf2150
AK		 2390 r = create_vcpu_fd(vcpu);
2391 if (r < 0)
2392 goto out_free_vcpus;
2393
39c3b86e
AK		 2394 spin_lock(&kvm_lock);
2395 if (n >= kvm->nvcpus)
2396 kvm->nvcpus = n + 1;
2397 spin_unlock(&kvm_lock);
2398
bccf2150 2399 return r;
c5ea7660
AK		 2400
2401out_free_vcpus:
2402 kvm_free_vcpu(vcpu);
039576c0
AK		 2403out_free_run:
2404 free_page((unsigned long)vcpu->run);
2405 vcpu->run = NULL;
9a2bb7f4 2406out_unlock:
c5ea7660
AK		 2407 mutex_unlock(&vcpu->mutex);
2408out:
2409 return r;
2410}
2411
2cc51560
ED		 2412static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2413{
2414 u64 efer;
2415 int i;
2416 struct kvm_cpuid_entry *e, *entry;
2417
2418 rdmsrl(MSR_EFER, efer);
2419 entry = NULL;
2420 for (i = 0; i < vcpu->cpuid_nent; ++i) {
2421 e = &vcpu->cpuid_entries[i];
2422 if (e->function == 0x80000001) {
2423 entry = e;
2424 break;
2425 }
2426 }
2427 if (entry && (entry->edx & EFER_NX) && !(efer & EFER_NX)) {
2428 entry->edx &= ~(1 << 20);
2429 printk(KERN_INFO ": guest NX capability removed\n");
2430 }
2431}
2432
06465c5a
AK		 2433static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2434 struct kvm_cpuid *cpuid,
2435 struct kvm_cpuid_entry __user *entries)
2436{
2437 int r;
2438
2439 r = -E2BIG;
2440 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2441 goto out;
2442 r = -EFAULT;
2443 if (copy_from_user(&vcpu->cpuid_entries, entries,
2444 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2445 goto out;
2446 vcpu->cpuid_nent = cpuid->nent;
2cc51560 2447 cpuid_fix_nx_cap(vcpu);
06465c5a
AK		 2448 return 0;
2449
2450out:
2451 return r;
2452}
2453
1961d276
AK		 2454static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2455{
2456 if (sigset) {
2457 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2458 vcpu->sigset_active = 1;
2459 vcpu->sigset = *sigset;
2460 } else
2461 vcpu->sigset_active = 0;
2462 return 0;
2463}
2464
b8836737
AK		 2465/*
2466 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2467 * we have asm/x86/processor.h
2468 */
2469struct fxsave {
2470 u16 cwd;
2471 u16 swd;
2472 u16 twd;
2473 u16 fop;
2474 u64 rip;
2475 u64 rdp;
2476 u32 mxcsr;
2477 u32 mxcsr_mask;
2478 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2479#ifdef CONFIG_X86_64
2480 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2481#else
2482 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2483#endif
2484};
2485
2486static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2487{
2488 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2489
2490 vcpu_load(vcpu);
2491
2492 memcpy(fpu->fpr, fxsave->st_space, 128);
2493 fpu->fcw = fxsave->cwd;
2494 fpu->fsw = fxsave->swd;
2495 fpu->ftwx = fxsave->twd;
2496 fpu->last_opcode = fxsave->fop;
2497 fpu->last_ip = fxsave->rip;
2498 fpu->last_dp = fxsave->rdp;
2499 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2500
2501 vcpu_put(vcpu);
2502
2503 return 0;
2504}
2505
2506static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2507{
2508 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2509
2510 vcpu_load(vcpu);
2511
2512 memcpy(fxsave->st_space, fpu->fpr, 128);
2513 fxsave->cwd = fpu->fcw;
2514 fxsave->swd = fpu->fsw;
2515 fxsave->twd = fpu->ftwx;
2516 fxsave->fop = fpu->last_opcode;
2517 fxsave->rip = fpu->last_ip;
2518 fxsave->rdp = fpu->last_dp;
2519 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2520
2521 vcpu_put(vcpu);
2522
2523 return 0;
2524}
2525
bccf2150
AK		 2526static long kvm_vcpu_ioctl(struct file *filp,
2527 unsigned int ioctl, unsigned long arg)
6aa8b732 2528{
bccf2150 2529 struct kvm_vcpu *vcpu = filp->private_data;
2f366987 2530 void __user *argp = (void __user *)arg;
6aa8b732
AK		 2531 int r = -EINVAL;
2532
2533 switch (ioctl) {
9a2bb7f4 2534 case KVM_RUN:
f0fe5108
AK		 2535 r = -EINVAL;
2536 if (arg)
2537 goto out;
9a2bb7f4 2538 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
6aa8b732 2539 break;
6aa8b732
AK		 2540 case KVM_GET_REGS: {
2541 struct kvm_regs kvm_regs;
2542
bccf2150
AK		 2543 memset(&kvm_regs, 0, sizeof kvm_regs);
2544 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2545 if (r)
2546 goto out;
2547 r = -EFAULT;
2f366987 2548 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 2549 goto out;
2550 r = 0;
2551 break;
2552 }
2553 case KVM_SET_REGS: {
2554 struct kvm_regs kvm_regs;
2555
2556 r = -EFAULT;
2f366987 2557 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732 2558 goto out;
bccf2150 2559 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2560 if (r)
2561 goto out;
2562 r = 0;
2563 break;
2564 }
2565 case KVM_GET_SREGS: {
2566 struct kvm_sregs kvm_sregs;
2567
bccf2150
AK		 2568 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2569 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2570 if (r)
2571 goto out;
2572 r = -EFAULT;
2f366987 2573 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 2574 goto out;
2575 r = 0;
2576 break;
2577 }
2578 case KVM_SET_SREGS: {
2579 struct kvm_sregs kvm_sregs;
2580
2581 r = -EFAULT;
2f366987 2582 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732 2583 goto out;
bccf2150 2584 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2585 if (r)
2586 goto out;
2587 r = 0;
2588 break;
2589 }
2590 case KVM_TRANSLATE: {
2591 struct kvm_translation tr;
2592
2593 r = -EFAULT;
2f366987 2594 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732 2595 goto out;
bccf2150 2596 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
6aa8b732
AK		 2597 if (r)
2598 goto out;
2599 r = -EFAULT;
2f366987 2600 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 2601 goto out;
2602 r = 0;
2603 break;
2604 }
2605 case KVM_INTERRUPT: {
2606 struct kvm_interrupt irq;
2607
2608 r = -EFAULT;
2f366987 2609 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732 2610 goto out;
bccf2150 2611 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
6aa8b732
AK		 2612 if (r)
2613 goto out;
2614 r = 0;
2615 break;
2616 }
2617 case KVM_DEBUG_GUEST: {
2618 struct kvm_debug_guest dbg;
2619
2620 r = -EFAULT;
2f366987 2621 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732 2622 goto out;
bccf2150 2623 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
6aa8b732
AK		 2624 if (r)
2625 goto out;
2626 r = 0;
2627 break;
2628 }
bccf2150
AK		 2629 case KVM_GET_MSRS:
2630 r = msr_io(vcpu, argp, get_msr, 1);
2631 break;
2632 case KVM_SET_MSRS:
2633 r = msr_io(vcpu, argp, do_set_msr, 0);
2634 break;
06465c5a
AK		 2635 case KVM_SET_CPUID: {
2636 struct kvm_cpuid __user *cpuid_arg = argp;
2637 struct kvm_cpuid cpuid;
2638
2639 r = -EFAULT;
2640 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2641 goto out;
2642 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2643 if (r)
2644 goto out;
2645 break;
2646 }
1961d276
AK		 2647 case KVM_SET_SIGNAL_MASK: {
2648 struct kvm_signal_mask __user *sigmask_arg = argp;
2649 struct kvm_signal_mask kvm_sigmask;
2650 sigset_t sigset, *p;
2651
2652 p = NULL;
2653 if (argp) {
2654 r = -EFAULT;
2655 if (copy_from_user(&kvm_sigmask, argp,
2656 sizeof kvm_sigmask))
2657 goto out;
2658 r = -EINVAL;
2659 if (kvm_sigmask.len != sizeof sigset)
2660 goto out;
2661 r = -EFAULT;
2662 if (copy_from_user(&sigset, sigmask_arg->sigset,
2663 sizeof sigset))
2664 goto out;
2665 p = &sigset;
2666 }
2667 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2668 break;
2669 }
b8836737
AK		 2670 case KVM_GET_FPU: {
2671 struct kvm_fpu fpu;
2672
2673 memset(&fpu, 0, sizeof fpu);
2674 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
2675 if (r)
2676 goto out;
2677 r = -EFAULT;
2678 if (copy_to_user(argp, &fpu, sizeof fpu))
2679 goto out;
2680 r = 0;
2681 break;
2682 }
2683 case KVM_SET_FPU: {
2684 struct kvm_fpu fpu;
2685
2686 r = -EFAULT;
2687 if (copy_from_user(&fpu, argp, sizeof fpu))
2688 goto out;
2689 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
2690 if (r)
2691 goto out;
2692 r = 0;
2693 break;
2694 }
bccf2150
AK		 2695 default:
2696 ;
2697 }
2698out:
2699 return r;
2700}
2701
2702static long kvm_vm_ioctl(struct file *filp,
2703 unsigned int ioctl, unsigned long arg)
2704{
2705 struct kvm *kvm = filp->private_data;
2706 void __user *argp = (void __user *)arg;
2707 int r = -EINVAL;
2708
2709 switch (ioctl) {
2710 case KVM_CREATE_VCPU:
2711 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2712 if (r < 0)
2713 goto out;
2714 break;
6aa8b732
AK		 2715 case KVM_SET_MEMORY_REGION: {
2716 struct kvm_memory_region kvm_mem;
2717
2718 r = -EFAULT;
2f366987 2719 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
6aa8b732 2720 goto out;
2c6f5df9 2721 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
6aa8b732
AK		 2722 if (r)
2723 goto out;
2724 break;
2725 }
2726 case KVM_GET_DIRTY_LOG: {
2727 struct kvm_dirty_log log;
2728
2729 r = -EFAULT;
2f366987 2730 if (copy_from_user(&log, argp, sizeof log))
6aa8b732 2731 goto out;
2c6f5df9 2732 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
6aa8b732
AK		 2733 if (r)
2734 goto out;
2735 break;
2736 }
e8207547
AK		 2737 case KVM_SET_MEMORY_ALIAS: {
2738 struct kvm_memory_alias alias;
2739
2740 r = -EFAULT;
2741 if (copy_from_user(&alias, argp, sizeof alias))
2742 goto out;
2743 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
2744 if (r)
2745 goto out;
2746 break;
2747 }
f17abe9a
AK		 2748 default:
2749 ;
2750 }
2751out:
2752 return r;
2753}
2754
2755static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2756 unsigned long address,
2757 int *type)
2758{
2759 struct kvm *kvm = vma->vm_file->private_data;
2760 unsigned long pgoff;
f17abe9a
AK		 2761 struct page *page;
2762
2763 *type = VM_FAULT_MINOR;
2764 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
954bbbc2 2765 page = gfn_to_page(kvm, pgoff);
f17abe9a
AK		 2766 if (!page)
2767 return NOPAGE_SIGBUS;
2768 get_page(page);
2769 return page;
2770}
2771
2772static struct vm_operations_struct kvm_vm_vm_ops = {
2773 .nopage = kvm_vm_nopage,
2774};
2775
2776static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2777{
2778 vma->vm_ops = &kvm_vm_vm_ops;
2779 return 0;
2780}
2781
2782static struct file_operations kvm_vm_fops = {
2783 .release = kvm_vm_release,
2784 .unlocked_ioctl = kvm_vm_ioctl,
2785 .compat_ioctl = kvm_vm_ioctl,
2786 .mmap = kvm_vm_mmap,
2787};
2788
2789static int kvm_dev_ioctl_create_vm(void)
2790{
2791 int fd, r;
2792 struct inode *inode;
2793 struct file *file;
2794 struct kvm *kvm;
2795
2796 inode = kvmfs_inode(&kvm_vm_fops);
2797 if (IS_ERR(inode)) {
2798 r = PTR_ERR(inode);
2799 goto out1;
2800 }
2801
2802 kvm = kvm_create_vm();
2803 if (IS_ERR(kvm)) {
2804 r = PTR_ERR(kvm);
2805 goto out2;
2806 }
2807
2808 file = kvmfs_file(inode, kvm);
2809 if (IS_ERR(file)) {
2810 r = PTR_ERR(file);
2811 goto out3;
2812 }
bccf2150 2813 kvm->filp = file;
f17abe9a
AK		 2814
2815 r = get_unused_fd();
2816 if (r < 0)
2817 goto out4;
2818 fd = r;
2819 fd_install(fd, file);
2820
2821 return fd;
2822
2823out4:
2824 fput(file);
2825out3:
2826 kvm_destroy_vm(kvm);
2827out2:
2828 iput(inode);
2829out1:
2830 return r;
2831}
2832
2833static long kvm_dev_ioctl(struct file *filp,
2834 unsigned int ioctl, unsigned long arg)
2835{
2836 void __user *argp = (void __user *)arg;
07c45a36 2837 long r = -EINVAL;
f17abe9a
AK		 2838
2839 switch (ioctl) {
2840 case KVM_GET_API_VERSION:
f0fe5108
AK		 2841 r = -EINVAL;
2842 if (arg)
2843 goto out;
f17abe9a
AK		 2844 r = KVM_API_VERSION;
2845 break;
2846 case KVM_CREATE_VM:
f0fe5108
AK		 2847 r = -EINVAL;
2848 if (arg)
2849 goto out;
f17abe9a
AK		 2850 r = kvm_dev_ioctl_create_vm();
2851 break;
6aa8b732 2852 case KVM_GET_MSR_INDEX_LIST: {
2f366987 2853 struct kvm_msr_list __user *user_msr_list = argp;
6aa8b732
AK		 2854 struct kvm_msr_list msr_list;
2855 unsigned n;
2856
2857 r = -EFAULT;
2858 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2859 goto out;
2860 n = msr_list.nmsrs;
6f00e68f 2861 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
6aa8b732
AK		 2862 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2863 goto out;
2864 r = -E2BIG;
bf591b24 2865 if (n < num_msrs_to_save)
6aa8b732
AK		 2866 goto out;
2867 r = -EFAULT;
2868 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 2869 num_msrs_to_save * sizeof(u32)))
6aa8b732 2870 goto out;
6f00e68f
AK		 2871 if (copy_to_user(user_msr_list->indices
2872 + num_msrs_to_save * sizeof(u32),
2873 &emulated_msrs,
2874 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2875 goto out;
6aa8b732 2876 r = 0;
cc1d8955 2877 break;
6aa8b732 2878 }
5d308f45
AK		 2879 case KVM_CHECK_EXTENSION:
2880 /*
2881 * No extensions defined at present.
2882 */
2883 r = 0;
2884 break;
07c45a36
AK		 2885 case KVM_GET_VCPU_MMAP_SIZE:
2886 r = -EINVAL;
2887 if (arg)
2888 goto out;
039576c0 2889 r = 2 * PAGE_SIZE;
07c45a36 2890 break;
6aa8b732
AK		 2891 default:
2892 ;
2893 }
2894out:
2895 return r;
2896}
2897
6aa8b732
AK		 2898static struct file_operations kvm_chardev_ops = {
2899 .open = kvm_dev_open,
2900 .release = kvm_dev_release,
2901 .unlocked_ioctl = kvm_dev_ioctl,
2902 .compat_ioctl = kvm_dev_ioctl,
6aa8b732
AK		 2903};
2904
2905static struct miscdevice kvm_dev = {
bbe4432e 2906 KVM_MINOR,
6aa8b732
AK		 2907 "kvm",
2908 &kvm_chardev_ops,
2909};
2910
2911static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2912 void *v)
2913{
2914 if (val == SYS_RESTART) {
2915 /*
2916 * Some (well, at least mine) BIOSes hang on reboot if
2917 * in vmx root mode.
2918 */
2919 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
8b6d44c7 2920 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2921 }
2922 return NOTIFY_OK;
2923}
2924
2925static struct notifier_block kvm_reboot_notifier = {
2926 .notifier_call = kvm_reboot,
2927 .priority = 0,
2928};
2929
774c47f1
AK		 2930/*
2931 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2932 * cached on it.
2933 */
2934static void decache_vcpus_on_cpu(int cpu)
2935{
2936 struct kvm *vm;
2937 struct kvm_vcpu *vcpu;
2938 int i;
2939
2940 spin_lock(&kvm_lock);
2941 list_for_each_entry(vm, &vm_list, vm_list)
2942 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2943 vcpu = &vm->vcpus[i];
2944 /*
2945 * If the vcpu is locked, then it is running on some
2946 * other cpu and therefore it is not cached on the
2947 * cpu in question.
2948 *
2949 * If it's not locked, check the last cpu it executed
2950 * on.
2951 */
2952 if (mutex_trylock(&vcpu->mutex)) {
2953 if (vcpu->cpu == cpu) {
2954 kvm_arch_ops->vcpu_decache(vcpu);
2955 vcpu->cpu = -1;
2956 }
2957 mutex_unlock(&vcpu->mutex);
2958 }
2959 }
2960 spin_unlock(&kvm_lock);
2961}
2962
2963static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2964 void *v)
2965{
2966 int cpu = (long)v;
2967
2968 switch (val) {
43934a38 2969 case CPU_DOWN_PREPARE:
8bb78442 2970 case CPU_DOWN_PREPARE_FROZEN:
774c47f1 2971 case CPU_UP_CANCELED:
8bb78442 2972 case CPU_UP_CANCELED_FROZEN:
43934a38
JK		 2973 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2974 cpu);
774c47f1
AK		 2975 decache_vcpus_on_cpu(cpu);
2976 smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
2977 NULL, 0, 1);
2978 break;
43934a38 2979 case CPU_ONLINE:
8bb78442 2980 case CPU_ONLINE_FROZEN:
43934a38
JK		 2981 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2982 cpu);
774c47f1
AK		 2983 smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
2984 NULL, 0, 1);
2985 break;
2986 }
2987 return NOTIFY_OK;
2988}
2989
2990static struct notifier_block kvm_cpu_notifier = {
2991 .notifier_call = kvm_cpu_hotplug,
2992 .priority = 20, /* must be > scheduler priority */
2993};
2994
1165f5fe
AK		 2995static u64 stat_get(void *_offset)
2996{
2997 unsigned offset = (long)_offset;
2998 u64 total = 0;
2999 struct kvm *kvm;
3000 struct kvm_vcpu *vcpu;
3001 int i;
3002
3003 spin_lock(&kvm_lock);
3004 list_for_each_entry(kvm, &vm_list, vm_list)
3005 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3006 vcpu = &kvm->vcpus[i];
3007 total += *(u32 *)((void *)vcpu + offset);
3008 }
3009 spin_unlock(&kvm_lock);
3010 return total;
3011}
3012
3013static void stat_set(void *offset, u64 val)
3014{
3015}
3016
3017DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, stat_set, "%llu\n");
3018
6aa8b732
AK		 3019static __init void kvm_init_debug(void)
3020{
3021 struct kvm_stats_debugfs_item *p;
3022
8b6d44c7 3023 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732 3024 for (p = debugfs_entries; p->name; ++p)
1165f5fe
AK		 3025 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
3026 (void *)(long)p->offset,
3027 &stat_fops);
6aa8b732
AK		 3028}
3029
3030static void kvm_exit_debug(void)
3031{
3032 struct kvm_stats_debugfs_item *p;
3033
3034 for (p = debugfs_entries; p->name; ++p)
3035 debugfs_remove(p->dentry);
3036 debugfs_remove(debugfs_dir);
3037}
3038
59ae6c6b
AK		 3039static int kvm_suspend(struct sys_device *dev, pm_message_t state)
3040{
3041 decache_vcpus_on_cpu(raw_smp_processor_id());
19d1408d 3042 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
59ae6c6b
AK		 3043 return 0;
3044}
3045
3046static int kvm_resume(struct sys_device *dev)
3047{
19d1408d 3048 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
59ae6c6b
AK		 3049 return 0;
3050}
3051
3052static struct sysdev_class kvm_sysdev_class = {
3053 set_kset_name("kvm"),
3054 .suspend = kvm_suspend,
3055 .resume = kvm_resume,
3056};
3057
3058static struct sys_device kvm_sysdev = {
3059 .id = 0,
3060 .cls = &kvm_sysdev_class,
3061};
3062
6aa8b732
AK		 3063hpa_t bad_page_address;
3064
37e29d90
AK		 3065static int kvmfs_get_sb(struct file_system_type *fs_type, int flags,
3066 const char *dev_name, void *data, struct vfsmount *mnt)
3067{
e9cdb1e3 3068 return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_SUPER_MAGIC, mnt);
37e29d90
AK		 3069}
3070
3071static struct file_system_type kvm_fs_type = {
3072 .name = "kvmfs",
3073 .get_sb = kvmfs_get_sb,
3074 .kill_sb = kill_anon_super,
3075};
3076
6aa8b732
AK		 3077int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
3078{
3079 int r;
3080
09db28b8
YI		 3081 if (kvm_arch_ops) {
3082 printk(KERN_ERR "kvm: already loaded the other module\n");
3083 return -EEXIST;
3084 }
3085
e097f35c 3086 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 3087 printk(KERN_ERR "kvm: no hardware support\n");
3088 return -EOPNOTSUPP;
3089 }
e097f35c 3090 if (ops->disabled_by_bios()) {
6aa8b732
AK		 3091 printk(KERN_ERR "kvm: disabled by bios\n");
3092 return -EOPNOTSUPP;
3093 }
3094
e097f35c
YI		 3095 kvm_arch_ops = ops;
3096
6aa8b732
AK		 3097 r = kvm_arch_ops->hardware_setup();
3098 if (r < 0)
ca45aaae 3099 goto out;
6aa8b732 3100
8b6d44c7 3101 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
774c47f1
AK		 3102 r = register_cpu_notifier(&kvm_cpu_notifier);
3103 if (r)
3104 goto out_free_1;
6aa8b732
AK		 3105 register_reboot_notifier(&kvm_reboot_notifier);
3106
59ae6c6b
AK		 3107 r = sysdev_class_register(&kvm_sysdev_class);
3108 if (r)
3109 goto out_free_2;
3110
3111 r = sysdev_register(&kvm_sysdev);
3112 if (r)
3113 goto out_free_3;
3114
6aa8b732
AK		 3115 kvm_chardev_ops.owner = module;
3116
3117 r = misc_register(&kvm_dev);
3118 if (r) {
3119 printk (KERN_ERR "kvm: misc device register failed\n");
3120 goto out_free;
3121 }
3122
3123 return r;
3124
3125out_free:
59ae6c6b
AK		 3126 sysdev_unregister(&kvm_sysdev);
3127out_free_3:
3128 sysdev_class_unregister(&kvm_sysdev_class);
3129out_free_2:
6aa8b732 3130 unregister_reboot_notifier(&kvm_reboot_notifier);
774c47f1
AK		 3131 unregister_cpu_notifier(&kvm_cpu_notifier);
3132out_free_1:
8b6d44c7 3133 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 3134 kvm_arch_ops->hardware_unsetup();
ca45aaae
AK		 3135out:
3136 kvm_arch_ops = NULL;
6aa8b732
AK		 3137 return r;
3138}
3139
3140void kvm_exit_arch(void)
3141{
3142 misc_deregister(&kvm_dev);
59ae6c6b
AK		 3143 sysdev_unregister(&kvm_sysdev);
3144 sysdev_class_unregister(&kvm_sysdev_class);
6aa8b732 3145 unregister_reboot_notifier(&kvm_reboot_notifier);
59ae6c6b 3146 unregister_cpu_notifier(&kvm_cpu_notifier);
8b6d44c7 3147 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 3148 kvm_arch_ops->hardware_unsetup();
09db28b8 3149 kvm_arch_ops = NULL;
6aa8b732
AK		 3150}
3151
3152static __init int kvm_init(void)
3153{
3154 static struct page *bad_page;
37e29d90
AK		 3155 int r;
3156
b5a33a75
AK		 3157 r = kvm_mmu_module_init();
3158 if (r)
3159 goto out4;
3160
37e29d90
AK		 3161 r = register_filesystem(&kvm_fs_type);
3162 if (r)
3163 goto out3;
6aa8b732 3164
37e29d90
AK		 3165 kvmfs_mnt = kern_mount(&kvm_fs_type);
3166 r = PTR_ERR(kvmfs_mnt);
3167 if (IS_ERR(kvmfs_mnt))
3168 goto out2;
6aa8b732
AK		 3169 kvm_init_debug();
3170
bf591b24
MR		 3171 kvm_init_msr_list();
3172
6aa8b732
AK		 3173 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3174 r = -ENOMEM;
3175 goto out;
3176 }
3177
3178 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3179 memset(__va(bad_page_address), 0, PAGE_SIZE);
3180
58e690e6 3181 return 0;
6aa8b732
AK		 3182
3183out:
3184 kvm_exit_debug();
37e29d90
AK		 3185 mntput(kvmfs_mnt);
3186out2:
3187 unregister_filesystem(&kvm_fs_type);
3188out3:
b5a33a75
AK		 3189 kvm_mmu_module_exit();
3190out4:
6aa8b732
AK		 3191 return r;
3192}
3193
3194static __exit void kvm_exit(void)
3195{
3196 kvm_exit_debug();
3197 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
37e29d90
AK		 3198 mntput(kvmfs_mnt);
3199 unregister_filesystem(&kvm_fs_type);
b5a33a75 3200 kvm_mmu_module_exit();
6aa8b732
AK		 3201}
3202
3203module_init(kvm_init)
3204module_exit(kvm_exit)
3205
3206EXPORT_SYMBOL_GPL(kvm_init_arch);
3207EXPORT_SYMBOL_GPL(kvm_exit_arch);
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