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KVM: Allow userspace to process hypercalls which have no kernel handler
[deliverable/linux.git] / drivers / kvm / kvm_main.c
CommitLineData
6aa8b732
AK		 1/*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
8 *
9 * Authors:
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
12 *
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
15 *
16 */
17
18#include "kvm.h"
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>
6aa8b732
AK		 43
44#include "x86_emulate.h"
45#include "segment_descriptor.h"
46
47MODULE_AUTHOR("Qumranet");
48MODULE_LICENSE("GPL");
49
133de902
AK		 50static DEFINE_SPINLOCK(kvm_lock);
51static LIST_HEAD(vm_list);
52
6aa8b732
AK		 53struct kvm_arch_ops *kvm_arch_ops;
54struct kvm_stat kvm_stat;
55EXPORT_SYMBOL_GPL(kvm_stat);
56
57static struct kvm_stats_debugfs_item {
58 const char *name;
59 u32 *data;
60 struct dentry *dentry;
61} debugfs_entries[] = {
62 { "pf_fixed", &kvm_stat.pf_fixed },
63 { "pf_guest", &kvm_stat.pf_guest },
64 { "tlb_flush", &kvm_stat.tlb_flush },
65 { "invlpg", &kvm_stat.invlpg },
66 { "exits", &kvm_stat.exits },
67 { "io_exits", &kvm_stat.io_exits },
68 { "mmio_exits", &kvm_stat.mmio_exits },
69 { "signal_exits", &kvm_stat.signal_exits },
c1150d8c
DL		 70 { "irq_window", &kvm_stat.irq_window_exits },
71 { "halt_exits", &kvm_stat.halt_exits },
72 { "request_irq", &kvm_stat.request_irq_exits },
6aa8b732 73 { "irq_exits", &kvm_stat.irq_exits },
8b6d44c7 74 { NULL, NULL }
6aa8b732
AK		 75};
76
77static struct dentry *debugfs_dir;
78
37e29d90
AK		 79struct vfsmount *kvmfs_mnt;
80
6aa8b732
AK		 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
f17abe9a
AK		 102static struct inode *kvmfs_inode(struct file_operations *fops)
103{
104 int error = -ENOMEM;
105 struct inode *inode = new_inode(kvmfs_mnt->mnt_sb);
106
107 if (!inode)
108 goto eexit_1;
109
110 inode->i_fop = fops;
111
112 /*
113 * Mark the inode dirty from the very beginning,
114 * that way it will never be moved to the dirty
115 * list because mark_inode_dirty() will think
116 * that it already _is_ on the dirty list.
117 */
118 inode->i_state = I_DIRTY;
119 inode->i_mode = S_IRUSR | S_IWUSR;
120 inode->i_uid = current->fsuid;
121 inode->i_gid = current->fsgid;
122 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
123 return inode;
124
125eexit_1:
126 return ERR_PTR(error);
127}
128
129static struct file *kvmfs_file(struct inode *inode, void *private_data)
130{
131 struct file *file = get_empty_filp();
132
133 if (!file)
134 return ERR_PTR(-ENFILE);
135
136 file->f_path.mnt = mntget(kvmfs_mnt);
137 file->f_path.dentry = d_alloc_anon(inode);
138 if (!file->f_path.dentry)
139 return ERR_PTR(-ENOMEM);
140 file->f_mapping = inode->i_mapping;
141
142 file->f_pos = 0;
143 file->f_flags = O_RDWR;
144 file->f_op = inode->i_fop;
145 file->f_mode = FMODE_READ | FMODE_WRITE;
146 file->f_version = 0;
147 file->private_data = private_data;
148 return file;
149}
150
6aa8b732
AK		 151unsigned long segment_base(u16 selector)
152{
153 struct descriptor_table gdt;
154 struct segment_descriptor *d;
155 unsigned long table_base;
156 typedef unsigned long ul;
157 unsigned long v;
158
159 if (selector == 0)
160 return 0;
161
162 asm ("sgdt %0" : "=m"(gdt));
163 table_base = gdt.base;
164
165 if (selector & 4) { /* from ldt */
166 u16 ldt_selector;
167
168 asm ("sldt %0" : "=g"(ldt_selector));
169 table_base = segment_base(ldt_selector);
170 }
171 d = (struct segment_descriptor *)(table_base + (selector & ~7));
172 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
05b3e0c2 173#ifdef CONFIG_X86_64
6aa8b732
AK		 174 if (d->system == 0
175 && (d->type == 2 || d->type == 9 || d->type == 11))
176 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
177#endif
178 return v;
179}
180EXPORT_SYMBOL_GPL(segment_base);
181
5aacf0ca
JM		 182static inline int valid_vcpu(int n)
183{
184 return likely(n >= 0 && n < KVM_MAX_VCPUS);
185}
186
d27d4aca
AK		 187int kvm_read_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
188 void *dest)
6aa8b732
AK		 189{
190 unsigned char *host_buf = dest;
191 unsigned long req_size = size;
192
193 while (size) {
194 hpa_t paddr;
195 unsigned now;
196 unsigned offset;
197 hva_t guest_buf;
198
199 paddr = gva_to_hpa(vcpu, addr);
200
201 if (is_error_hpa(paddr))
202 break;
203
204 guest_buf = (hva_t)kmap_atomic(
205 pfn_to_page(paddr >> PAGE_SHIFT),
206 KM_USER0);
207 offset = addr & ~PAGE_MASK;
208 guest_buf |= offset;
209 now = min(size, PAGE_SIZE - offset);
210 memcpy(host_buf, (void*)guest_buf, now);
211 host_buf += now;
212 addr += now;
213 size -= now;
214 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
215 }
216 return req_size - size;
217}
218EXPORT_SYMBOL_GPL(kvm_read_guest);
219
d27d4aca
AK		 220int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
221 void *data)
6aa8b732
AK		 222{
223 unsigned char *host_buf = data;
224 unsigned long req_size = size;
225
226 while (size) {
227 hpa_t paddr;
228 unsigned now;
229 unsigned offset;
230 hva_t guest_buf;
ab51a434 231 gfn_t gfn;
6aa8b732
AK		 232
233 paddr = gva_to_hpa(vcpu, addr);
234
235 if (is_error_hpa(paddr))
236 break;
237
ab51a434
UL		 238 gfn = vcpu->mmu.gva_to_gpa(vcpu, addr) >> PAGE_SHIFT;
239 mark_page_dirty(vcpu->kvm, gfn);
6aa8b732
AK		 240 guest_buf = (hva_t)kmap_atomic(
241 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
242 offset = addr & ~PAGE_MASK;
243 guest_buf |= offset;
244 now = min(size, PAGE_SIZE - offset);
245 memcpy((void*)guest_buf, host_buf, now);
246 host_buf += now;
247 addr += now;
248 size -= now;
249 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
250 }
251 return req_size - size;
252}
253EXPORT_SYMBOL_GPL(kvm_write_guest);
254
bccf2150
AK		 255/*
256 * Switches to specified vcpu, until a matching vcpu_put()
257 */
258static void vcpu_load(struct kvm_vcpu *vcpu)
6aa8b732 259{
bccf2150
AK		 260 mutex_lock(&vcpu->mutex);
261 kvm_arch_ops->vcpu_load(vcpu);
6aa8b732
AK		 262}
263
264/*
bccf2150
AK		 265 * Switches to specified vcpu, until a matching vcpu_put(). Will return NULL
266 * if the slot is not populated.
6aa8b732 267 */
bccf2150 268static struct kvm_vcpu *vcpu_load_slot(struct kvm *kvm, int slot)
6aa8b732 269{
bccf2150 270 struct kvm_vcpu *vcpu = &kvm->vcpus[slot];
6aa8b732
AK		 271
272 mutex_lock(&vcpu->mutex);
bccf2150 273 if (!vcpu->vmcs) {
6aa8b732 274 mutex_unlock(&vcpu->mutex);
8b6d44c7 275 return NULL;
6aa8b732 276 }
bccf2150
AK		 277 kvm_arch_ops->vcpu_load(vcpu);
278 return vcpu;
6aa8b732
AK		 279}
280
281static void vcpu_put(struct kvm_vcpu *vcpu)
282{
283 kvm_arch_ops->vcpu_put(vcpu);
6aa8b732
AK		 284 mutex_unlock(&vcpu->mutex);
285}
286
f17abe9a 287static struct kvm *kvm_create_vm(void)
6aa8b732
AK		 288{
289 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
290 int i;
291
292 if (!kvm)
f17abe9a 293 return ERR_PTR(-ENOMEM);
6aa8b732
AK		 294
295 spin_lock_init(&kvm->lock);
296 INIT_LIST_HEAD(&kvm->active_mmu_pages);
297 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
298 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
299
300 mutex_init(&vcpu->mutex);
133de902 301 vcpu->cpu = -1;
86a2b42e 302 vcpu->kvm = kvm;
6aa8b732
AK		 303 vcpu->mmu.root_hpa = INVALID_PAGE;
304 INIT_LIST_HEAD(&vcpu->free_pages);
133de902
AK		 305 spin_lock(&kvm_lock);
306 list_add(&kvm->vm_list, &vm_list);
307 spin_unlock(&kvm_lock);
6aa8b732 308 }
f17abe9a
AK		 309 return kvm;
310}
311
312static int kvm_dev_open(struct inode *inode, struct file *filp)
313{
6aa8b732
AK		 314 return 0;
315}
316
317/*
318 * Free any memory in @free but not in @dont.
319 */
320static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
321 struct kvm_memory_slot *dont)
322{
323 int i;
324
325 if (!dont || free->phys_mem != dont->phys_mem)
326 if (free->phys_mem) {
327 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 328 if (free->phys_mem[i])
329 __free_page(free->phys_mem[i]);
6aa8b732
AK		 330 vfree(free->phys_mem);
331 }
332
333 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
334 vfree(free->dirty_bitmap);
335
8b6d44c7 336 free->phys_mem = NULL;
6aa8b732 337 free->npages = 0;
8b6d44c7 338 free->dirty_bitmap = NULL;
6aa8b732
AK		 339}
340
341static void kvm_free_physmem(struct kvm *kvm)
342{
343 int i;
344
345 for (i = 0; i < kvm->nmemslots; ++i)
8b6d44c7 346 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
6aa8b732
AK		 347}
348
349static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
350{
bccf2150 351 if (!vcpu->vmcs)
1e8ba6fb
IM		 352 return;
353
bccf2150 354 vcpu_load(vcpu);
6aa8b732 355 kvm_mmu_destroy(vcpu);
08438475 356 vcpu_put(vcpu);
9ede74e0 357 kvm_arch_ops->vcpu_free(vcpu);
9a2bb7f4
AK		 358 free_page((unsigned long)vcpu->run);
359 vcpu->run = NULL;
6aa8b732
AK		 360}
361
362static void kvm_free_vcpus(struct kvm *kvm)
363{
364 unsigned int i;
365
366 for (i = 0; i < KVM_MAX_VCPUS; ++i)
367 kvm_free_vcpu(&kvm->vcpus[i]);
368}
369
370static int kvm_dev_release(struct inode *inode, struct file *filp)
371{
f17abe9a
AK		 372 return 0;
373}
6aa8b732 374
f17abe9a
AK		 375static void kvm_destroy_vm(struct kvm *kvm)
376{
133de902
AK		 377 spin_lock(&kvm_lock);
378 list_del(&kvm->vm_list);
379 spin_unlock(&kvm_lock);
6aa8b732
AK		 380 kvm_free_vcpus(kvm);
381 kvm_free_physmem(kvm);
382 kfree(kvm);
f17abe9a
AK		 383}
384
385static int kvm_vm_release(struct inode *inode, struct file *filp)
386{
387 struct kvm *kvm = filp->private_data;
388
389 kvm_destroy_vm(kvm);
6aa8b732
AK		 390 return 0;
391}
392
393static void inject_gp(struct kvm_vcpu *vcpu)
394{
395 kvm_arch_ops->inject_gp(vcpu, 0);
396}
397
1342d353
AK		 398/*
399 * Load the pae pdptrs. Return true is they are all valid.
400 */
401static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
6aa8b732
AK		 402{
403 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
1342d353 404 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
6aa8b732
AK		 405 int i;
406 u64 pdpte;
407 u64 *pdpt;
1342d353 408 int ret;
6aa8b732
AK		 409 struct kvm_memory_slot *memslot;
410
411 spin_lock(&vcpu->kvm->lock);
412 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
413 /* FIXME: !memslot - emulate? 0xff? */
414 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
415
1342d353 416 ret = 1;
6aa8b732
AK		 417 for (i = 0; i < 4; ++i) {
418 pdpte = pdpt[offset + i];
1342d353
AK		 419 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
420 ret = 0;
421 goto out;
422 }
6aa8b732
AK		 423 }
424
1342d353
AK		 425 for (i = 0; i < 4; ++i)
426 vcpu->pdptrs[i] = pdpt[offset + i];
427
428out:
6aa8b732
AK		 429 kunmap_atomic(pdpt, KM_USER0);
430 spin_unlock(&vcpu->kvm->lock);
431
1342d353 432 return ret;
6aa8b732
AK		 433}
434
435void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
436{
437 if (cr0 & CR0_RESEVED_BITS) {
438 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
439 cr0, vcpu->cr0);
440 inject_gp(vcpu);
441 return;
442 }
443
444 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
445 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
446 inject_gp(vcpu);
447 return;
448 }
449
450 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
451 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
452 "and a clear PE flag\n");
453 inject_gp(vcpu);
454 return;
455 }
456
457 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 458#ifdef CONFIG_X86_64
6aa8b732
AK		 459 if ((vcpu->shadow_efer & EFER_LME)) {
460 int cs_db, cs_l;
461
462 if (!is_pae(vcpu)) {
463 printk(KERN_DEBUG "set_cr0: #GP, start paging "
464 "in long mode while PAE is disabled\n");
465 inject_gp(vcpu);
466 return;
467 }
468 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
469 if (cs_l) {
470 printk(KERN_DEBUG "set_cr0: #GP, start paging "
471 "in long mode while CS.L == 1\n");
472 inject_gp(vcpu);
473 return;
474
475 }
476 } else
477#endif
1342d353 478 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 479 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
480 "reserved bits\n");
481 inject_gp(vcpu);
482 return;
483 }
484
485 }
486
487 kvm_arch_ops->set_cr0(vcpu, cr0);
488 vcpu->cr0 = cr0;
489
490 spin_lock(&vcpu->kvm->lock);
491 kvm_mmu_reset_context(vcpu);
492 spin_unlock(&vcpu->kvm->lock);
493 return;
494}
495EXPORT_SYMBOL_GPL(set_cr0);
496
497void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
498{
399badf3 499 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 500 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
501}
502EXPORT_SYMBOL_GPL(lmsw);
503
504void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
505{
506 if (cr4 & CR4_RESEVED_BITS) {
507 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
508 inject_gp(vcpu);
509 return;
510 }
511
a9058ecd 512 if (is_long_mode(vcpu)) {
6aa8b732
AK		 513 if (!(cr4 & CR4_PAE_MASK)) {
514 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
515 "in long mode\n");
516 inject_gp(vcpu);
517 return;
518 }
519 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
1342d353 520 && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 521 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
522 inject_gp(vcpu);
523 }
524
525 if (cr4 & CR4_VMXE_MASK) {
526 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
527 inject_gp(vcpu);
528 return;
529 }
530 kvm_arch_ops->set_cr4(vcpu, cr4);
531 spin_lock(&vcpu->kvm->lock);
532 kvm_mmu_reset_context(vcpu);
533 spin_unlock(&vcpu->kvm->lock);
534}
535EXPORT_SYMBOL_GPL(set_cr4);
536
537void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
538{
a9058ecd 539 if (is_long_mode(vcpu)) {
d27d4aca 540 if (cr3 & CR3_L_MODE_RESEVED_BITS) {
6aa8b732
AK		 541 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
542 inject_gp(vcpu);
543 return;
544 }
545 } else {
546 if (cr3 & CR3_RESEVED_BITS) {
547 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
548 inject_gp(vcpu);
549 return;
550 }
551 if (is_paging(vcpu) && is_pae(vcpu) &&
1342d353 552 !load_pdptrs(vcpu, cr3)) {
6aa8b732
AK		 553 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
554 "reserved bits\n");
555 inject_gp(vcpu);
556 return;
557 }
558 }
559
560 vcpu->cr3 = cr3;
561 spin_lock(&vcpu->kvm->lock);
d21225ee
IM		 562 /*
563 * Does the new cr3 value map to physical memory? (Note, we
564 * catch an invalid cr3 even in real-mode, because it would
565 * cause trouble later on when we turn on paging anyway.)
566 *
567 * A real CPU would silently accept an invalid cr3 and would
568 * attempt to use it - with largely undefined (and often hard
569 * to debug) behavior on the guest side.
570 */
571 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
572 inject_gp(vcpu);
573 else
574 vcpu->mmu.new_cr3(vcpu);
6aa8b732
AK		 575 spin_unlock(&vcpu->kvm->lock);
576}
577EXPORT_SYMBOL_GPL(set_cr3);
578
579void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
580{
581 if ( cr8 & CR8_RESEVED_BITS) {
582 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
583 inject_gp(vcpu);
584 return;
585 }
586 vcpu->cr8 = cr8;
587}
588EXPORT_SYMBOL_GPL(set_cr8);
589
590void fx_init(struct kvm_vcpu *vcpu)
591{
592 struct __attribute__ ((__packed__)) fx_image_s {
593 u16 control; //fcw
594 u16 status; //fsw
595 u16 tag; // ftw
596 u16 opcode; //fop
597 u64 ip; // fpu ip
598 u64 operand;// fpu dp
599 u32 mxcsr;
600 u32 mxcsr_mask;
601
602 } *fx_image;
603
604 fx_save(vcpu->host_fx_image);
605 fpu_init();
606 fx_save(vcpu->guest_fx_image);
607 fx_restore(vcpu->host_fx_image);
608
609 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
610 fx_image->mxcsr = 0x1f80;
611 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
612 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
613}
614EXPORT_SYMBOL_GPL(fx_init);
615
02b27c1f
UL		 616static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
617{
618 spin_lock(&vcpu->kvm->lock);
619 kvm_mmu_slot_remove_write_access(vcpu, slot);
620 spin_unlock(&vcpu->kvm->lock);
621}
622
6aa8b732
AK		 623/*
624 * Allocate some memory and give it an address in the guest physical address
625 * space.
626 *
627 * Discontiguous memory is allowed, mostly for framebuffers.
628 */
2c6f5df9
AK		 629static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
630 struct kvm_memory_region *mem)
6aa8b732
AK		 631{
632 int r;
633 gfn_t base_gfn;
634 unsigned long npages;
635 unsigned long i;
636 struct kvm_memory_slot *memslot;
637 struct kvm_memory_slot old, new;
638 int memory_config_version;
639
640 r = -EINVAL;
641 /* General sanity checks */
642 if (mem->memory_size & (PAGE_SIZE - 1))
643 goto out;
644 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
645 goto out;
646 if (mem->slot >= KVM_MEMORY_SLOTS)
647 goto out;
648 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
649 goto out;
650
651 memslot = &kvm->memslots[mem->slot];
652 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
653 npages = mem->memory_size >> PAGE_SHIFT;
654
655 if (!npages)
656 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
657
658raced:
659 spin_lock(&kvm->lock);
660
661 memory_config_version = kvm->memory_config_version;
662 new = old = *memslot;
663
664 new.base_gfn = base_gfn;
665 new.npages = npages;
666 new.flags = mem->flags;
667
668 /* Disallow changing a memory slot's size. */
669 r = -EINVAL;
670 if (npages && old.npages && npages != old.npages)
671 goto out_unlock;
672
673 /* Check for overlaps */
674 r = -EEXIST;
675 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
676 struct kvm_memory_slot *s = &kvm->memslots[i];
677
678 if (s == memslot)
679 continue;
680 if (!((base_gfn + npages <= s->base_gfn) ||
681 (base_gfn >= s->base_gfn + s->npages)))
682 goto out_unlock;
683 }
684 /*
685 * Do memory allocations outside lock. memory_config_version will
686 * detect any races.
687 */
688 spin_unlock(&kvm->lock);
689
690 /* Deallocate if slot is being removed */
691 if (!npages)
8b6d44c7 692 new.phys_mem = NULL;
6aa8b732
AK		 693
694 /* Free page dirty bitmap if unneeded */
695 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
8b6d44c7 696 new.dirty_bitmap = NULL;
6aa8b732
AK		 697
698 r = -ENOMEM;
699
700 /* Allocate if a slot is being created */
701 if (npages && !new.phys_mem) {
702 new.phys_mem = vmalloc(npages * sizeof(struct page *));
703
704 if (!new.phys_mem)
705 goto out_free;
706
707 memset(new.phys_mem, 0, npages * sizeof(struct page *));
708 for (i = 0; i < npages; ++i) {
709 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
710 | __GFP_ZERO);
711 if (!new.phys_mem[i])
712 goto out_free;
5972e953 713 set_page_private(new.phys_mem[i],0);
6aa8b732
AK		 714 }
715 }
716
717 /* Allocate page dirty bitmap if needed */
718 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
719 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
720
721 new.dirty_bitmap = vmalloc(dirty_bytes);
722 if (!new.dirty_bitmap)
723 goto out_free;
724 memset(new.dirty_bitmap, 0, dirty_bytes);
725 }
726
727 spin_lock(&kvm->lock);
728
729 if (memory_config_version != kvm->memory_config_version) {
730 spin_unlock(&kvm->lock);
731 kvm_free_physmem_slot(&new, &old);
732 goto raced;
733 }
734
735 r = -EAGAIN;
736 if (kvm->busy)
737 goto out_unlock;
738
739 if (mem->slot >= kvm->nmemslots)
740 kvm->nmemslots = mem->slot + 1;
741
742 *memslot = new;
743 ++kvm->memory_config_version;
744
745 spin_unlock(&kvm->lock);
746
747 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
748 struct kvm_vcpu *vcpu;
749
bccf2150 750 vcpu = vcpu_load_slot(kvm, i);
6aa8b732
AK		 751 if (!vcpu)
752 continue;
ff990d59
UL		 753 if (new.flags & KVM_MEM_LOG_DIRTY_PAGES)
754 do_remove_write_access(vcpu, mem->slot);
6aa8b732
AK		 755 kvm_mmu_reset_context(vcpu);
756 vcpu_put(vcpu);
757 }
758
759 kvm_free_physmem_slot(&old, &new);
760 return 0;
761
762out_unlock:
763 spin_unlock(&kvm->lock);
764out_free:
765 kvm_free_physmem_slot(&new, &old);
766out:
767 return r;
768}
769
770/*
771 * Get (and clear) the dirty memory log for a memory slot.
772 */
2c6f5df9
AK		 773static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
774 struct kvm_dirty_log *log)
6aa8b732
AK		 775{
776 struct kvm_memory_slot *memslot;
777 int r, i;
778 int n;
714b93da 779 int cleared;
6aa8b732
AK		 780 unsigned long any = 0;
781
782 spin_lock(&kvm->lock);
783
784 /*
785 * Prevent changes to guest memory configuration even while the lock
786 * is not taken.
787 */
788 ++kvm->busy;
789 spin_unlock(&kvm->lock);
790 r = -EINVAL;
791 if (log->slot >= KVM_MEMORY_SLOTS)
792 goto out;
793
794 memslot = &kvm->memslots[log->slot];
795 r = -ENOENT;
796 if (!memslot->dirty_bitmap)
797 goto out;
798
cd1a4a98 799 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
6aa8b732 800
cd1a4a98 801 for (i = 0; !any && i < n/sizeof(long); ++i)
6aa8b732
AK		 802 any = memslot->dirty_bitmap[i];
803
804 r = -EFAULT;
805 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
806 goto out;
807
6aa8b732 808 if (any) {
714b93da 809 cleared = 0;
6aa8b732 810 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
bccf2150 811 struct kvm_vcpu *vcpu;
6aa8b732 812
bccf2150 813 vcpu = vcpu_load_slot(kvm, i);
6aa8b732
AK		 814 if (!vcpu)
815 continue;
714b93da
AK		 816 if (!cleared) {
817 do_remove_write_access(vcpu, log->slot);
818 memset(memslot->dirty_bitmap, 0, n);
819 cleared = 1;
820 }
6aa8b732
AK		 821 kvm_arch_ops->tlb_flush(vcpu);
822 vcpu_put(vcpu);
823 }
824 }
825
826 r = 0;
827
828out:
829 spin_lock(&kvm->lock);
830 --kvm->busy;
831 spin_unlock(&kvm->lock);
832 return r;
833}
834
835struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
836{
837 int i;
838
839 for (i = 0; i < kvm->nmemslots; ++i) {
840 struct kvm_memory_slot *memslot = &kvm->memslots[i];
841
842 if (gfn >= memslot->base_gfn
843 && gfn < memslot->base_gfn + memslot->npages)
844 return memslot;
845 }
8b6d44c7 846 return NULL;
6aa8b732
AK		 847}
848EXPORT_SYMBOL_GPL(gfn_to_memslot);
849
850void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
851{
852 int i;
8b6d44c7 853 struct kvm_memory_slot *memslot = NULL;
6aa8b732
AK		 854 unsigned long rel_gfn;
855
856 for (i = 0; i < kvm->nmemslots; ++i) {
857 memslot = &kvm->memslots[i];
858
859 if (gfn >= memslot->base_gfn
860 && gfn < memslot->base_gfn + memslot->npages) {
861
862 if (!memslot || !memslot->dirty_bitmap)
863 return;
864
865 rel_gfn = gfn - memslot->base_gfn;
866
867 /* avoid RMW */
868 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
869 set_bit(rel_gfn, memslot->dirty_bitmap);
870 return;
871 }
872 }
873}
874
875static int emulator_read_std(unsigned long addr,
876 unsigned long *val,
877 unsigned int bytes,
878 struct x86_emulate_ctxt *ctxt)
879{
880 struct kvm_vcpu *vcpu = ctxt->vcpu;
881 void *data = val;
882
883 while (bytes) {
884 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
885 unsigned offset = addr & (PAGE_SIZE-1);
886 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
887 unsigned long pfn;
888 struct kvm_memory_slot *memslot;
889 void *page;
890
891 if (gpa == UNMAPPED_GVA)
892 return X86EMUL_PROPAGATE_FAULT;
893 pfn = gpa >> PAGE_SHIFT;
894 memslot = gfn_to_memslot(vcpu->kvm, pfn);
895 if (!memslot)
896 return X86EMUL_UNHANDLEABLE;
897 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
898
899 memcpy(data, page + offset, tocopy);
900
901 kunmap_atomic(page, KM_USER0);
902
903 bytes -= tocopy;
904 data += tocopy;
905 addr += tocopy;
906 }
907
908 return X86EMUL_CONTINUE;
909}
910
911static int emulator_write_std(unsigned long addr,
912 unsigned long val,
913 unsigned int bytes,
914 struct x86_emulate_ctxt *ctxt)
915{
916 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
917 addr, bytes);
918 return X86EMUL_UNHANDLEABLE;
919}
920
921static int emulator_read_emulated(unsigned long addr,
922 unsigned long *val,
923 unsigned int bytes,
924 struct x86_emulate_ctxt *ctxt)
925{
926 struct kvm_vcpu *vcpu = ctxt->vcpu;
927
928 if (vcpu->mmio_read_completed) {
929 memcpy(val, vcpu->mmio_data, bytes);
930 vcpu->mmio_read_completed = 0;
931 return X86EMUL_CONTINUE;
932 } else if (emulator_read_std(addr, val, bytes, ctxt)
933 == X86EMUL_CONTINUE)
934 return X86EMUL_CONTINUE;
935 else {
936 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
d27d4aca 937
6aa8b732 938 if (gpa == UNMAPPED_GVA)
d27d4aca 939 return X86EMUL_PROPAGATE_FAULT;
6aa8b732
AK		 940 vcpu->mmio_needed = 1;
941 vcpu->mmio_phys_addr = gpa;
942 vcpu->mmio_size = bytes;
943 vcpu->mmio_is_write = 0;
944
945 return X86EMUL_UNHANDLEABLE;
946 }
947}
948
da4a00f0
AK		 949static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
950 unsigned long val, int bytes)
951{
952 struct kvm_memory_slot *m;
953 struct page *page;
954 void *virt;
955
956 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
957 return 0;
958 m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
959 if (!m)
960 return 0;
961 page = gfn_to_page(m, gpa >> PAGE_SHIFT);
962 kvm_mmu_pre_write(vcpu, gpa, bytes);
ab51a434 963 mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
da4a00f0
AK		 964 virt = kmap_atomic(page, KM_USER0);
965 memcpy(virt + offset_in_page(gpa), &val, bytes);
966 kunmap_atomic(virt, KM_USER0);
967 kvm_mmu_post_write(vcpu, gpa, bytes);
968 return 1;
969}
970
6aa8b732
AK		 971static int emulator_write_emulated(unsigned long addr,
972 unsigned long val,
973 unsigned int bytes,
974 struct x86_emulate_ctxt *ctxt)
975{
976 struct kvm_vcpu *vcpu = ctxt->vcpu;
977 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
978
979 if (gpa == UNMAPPED_GVA)
980 return X86EMUL_PROPAGATE_FAULT;
981
da4a00f0
AK		 982 if (emulator_write_phys(vcpu, gpa, val, bytes))
983 return X86EMUL_CONTINUE;
984
6aa8b732
AK		 985 vcpu->mmio_needed = 1;
986 vcpu->mmio_phys_addr = gpa;
987 vcpu->mmio_size = bytes;
988 vcpu->mmio_is_write = 1;
989 memcpy(vcpu->mmio_data, &val, bytes);
990
991 return X86EMUL_CONTINUE;
992}
993
994static int emulator_cmpxchg_emulated(unsigned long addr,
995 unsigned long old,
996 unsigned long new,
997 unsigned int bytes,
998 struct x86_emulate_ctxt *ctxt)
999{
1000 static int reported;
1001
1002 if (!reported) {
1003 reported = 1;
1004 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1005 }
1006 return emulator_write_emulated(addr, new, bytes, ctxt);
1007}
1008
32b35627
AK		 1009#ifdef CONFIG_X86_32
1010
1011static int emulator_cmpxchg8b_emulated(unsigned long addr,
1012 unsigned long old_lo,
1013 unsigned long old_hi,
1014 unsigned long new_lo,
1015 unsigned long new_hi,
1016 struct x86_emulate_ctxt *ctxt)
1017{
1018 static int reported;
1019 int r;
1020
1021 if (!reported) {
1022 reported = 1;
1023 printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
1024 }
1025 r = emulator_write_emulated(addr, new_lo, 4, ctxt);
1026 if (r != X86EMUL_CONTINUE)
1027 return r;
1028 return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
1029}
1030
1031#endif
1032
6aa8b732
AK		 1033static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1034{
1035 return kvm_arch_ops->get_segment_base(vcpu, seg);
1036}
1037
1038int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1039{
6aa8b732
AK		 1040 return X86EMUL_CONTINUE;
1041}
1042
1043int emulate_clts(struct kvm_vcpu *vcpu)
1044{
399badf3 1045 unsigned long cr0;
6aa8b732 1046
399badf3
AK		 1047 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1048 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
6aa8b732
AK		 1049 kvm_arch_ops->set_cr0(vcpu, cr0);
1050 return X86EMUL_CONTINUE;
1051}
1052
1053int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1054{
1055 struct kvm_vcpu *vcpu = ctxt->vcpu;
1056
1057 switch (dr) {
1058 case 0 ... 3:
1059 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1060 return X86EMUL_CONTINUE;
1061 default:
1062 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1063 __FUNCTION__, dr);
1064 return X86EMUL_UNHANDLEABLE;
1065 }
1066}
1067
1068int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1069{
1070 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1071 int exception;
1072
1073 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1074 if (exception) {
1075 /* FIXME: better handling */
1076 return X86EMUL_UNHANDLEABLE;
1077 }
1078 return X86EMUL_CONTINUE;
1079}
1080
1081static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1082{
1083 static int reported;
1084 u8 opcodes[4];
1085 unsigned long rip = ctxt->vcpu->rip;
1086 unsigned long rip_linear;
1087
1088 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1089
1090 if (reported)
1091 return;
1092
1093 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1094
1095 printk(KERN_ERR "emulation failed but !mmio_needed?"
1096 " rip %lx %02x %02x %02x %02x\n",
1097 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1098 reported = 1;
1099}
1100
1101struct x86_emulate_ops emulate_ops = {
1102 .read_std = emulator_read_std,
1103 .write_std = emulator_write_std,
1104 .read_emulated = emulator_read_emulated,
1105 .write_emulated = emulator_write_emulated,
1106 .cmpxchg_emulated = emulator_cmpxchg_emulated,
32b35627
AK		 1107#ifdef CONFIG_X86_32
1108 .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated,
1109#endif
6aa8b732
AK		 1110};
1111
1112int emulate_instruction(struct kvm_vcpu *vcpu,
1113 struct kvm_run *run,
1114 unsigned long cr2,
1115 u16 error_code)
1116{
1117 struct x86_emulate_ctxt emulate_ctxt;
1118 int r;
1119 int cs_db, cs_l;
1120
1121 kvm_arch_ops->cache_regs(vcpu);
1122
1123 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1124
1125 emulate_ctxt.vcpu = vcpu;
1126 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1127 emulate_ctxt.cr2 = cr2;
1128 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1129 ? X86EMUL_MODE_REAL : cs_l
1130 ? X86EMUL_MODE_PROT64 : cs_db
1131 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1132
1133 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1134 emulate_ctxt.cs_base = 0;
1135 emulate_ctxt.ds_base = 0;
1136 emulate_ctxt.es_base = 0;
1137 emulate_ctxt.ss_base = 0;
1138 } else {
1139 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1140 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1141 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1142 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1143 }
1144
1145 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1146 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1147
1148 vcpu->mmio_is_write = 0;
1149 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1150
1151 if ((r || vcpu->mmio_is_write) && run) {
1152 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1153 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1154 run->mmio.len = vcpu->mmio_size;
1155 run->mmio.is_write = vcpu->mmio_is_write;
1156 }
1157
1158 if (r) {
a436036b
AK		 1159 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1160 return EMULATE_DONE;
6aa8b732
AK		 1161 if (!vcpu->mmio_needed) {
1162 report_emulation_failure(&emulate_ctxt);
1163 return EMULATE_FAIL;
1164 }
1165 return EMULATE_DO_MMIO;
1166 }
1167
1168 kvm_arch_ops->decache_regs(vcpu);
1169 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1170
1171 if (vcpu->mmio_is_write)
1172 return EMULATE_DO_MMIO;
1173
1174 return EMULATE_DONE;
1175}
1176EXPORT_SYMBOL_GPL(emulate_instruction);
1177
270fd9b9
AK		 1178int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1179{
1180 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1181
9b22bf57 1182 kvm_arch_ops->cache_regs(vcpu);
270fd9b9
AK		 1183 ret = -KVM_EINVAL;
1184#ifdef CONFIG_X86_64
1185 if (is_long_mode(vcpu)) {
1186 nr = vcpu->regs[VCPU_REGS_RAX];
1187 a0 = vcpu->regs[VCPU_REGS_RDI];
1188 a1 = vcpu->regs[VCPU_REGS_RSI];
1189 a2 = vcpu->regs[VCPU_REGS_RDX];
1190 a3 = vcpu->regs[VCPU_REGS_RCX];
1191 a4 = vcpu->regs[VCPU_REGS_R8];
1192 a5 = vcpu->regs[VCPU_REGS_R9];
1193 } else
1194#endif
1195 {
1196 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1197 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1198 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1199 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1200 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1201 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1202 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1203 }
1204 switch (nr) {
1205 default:
b4e63f56
AK		 1206 run->hypercall.args[0] = a0;
1207 run->hypercall.args[1] = a1;
1208 run->hypercall.args[2] = a2;
1209 run->hypercall.args[3] = a3;
1210 run->hypercall.args[4] = a4;
1211 run->hypercall.args[5] = a5;
1212 run->hypercall.ret = ret;
1213 run->hypercall.longmode = is_long_mode(vcpu);
1214 kvm_arch_ops->decache_regs(vcpu);
1215 return 0;
270fd9b9
AK		 1216 }
1217 vcpu->regs[VCPU_REGS_RAX] = ret;
9b22bf57 1218 kvm_arch_ops->decache_regs(vcpu);
270fd9b9
AK		 1219 return 1;
1220}
1221EXPORT_SYMBOL_GPL(kvm_hypercall);
1222
6aa8b732
AK		 1223static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1224{
1225 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1226}
1227
1228void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1229{
1230 struct descriptor_table dt = { limit, base };
1231
1232 kvm_arch_ops->set_gdt(vcpu, &dt);
1233}
1234
1235void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1236{
1237 struct descriptor_table dt = { limit, base };
1238
1239 kvm_arch_ops->set_idt(vcpu, &dt);
1240}
1241
1242void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1243 unsigned long *rflags)
1244{
1245 lmsw(vcpu, msw);
1246 *rflags = kvm_arch_ops->get_rflags(vcpu);
1247}
1248
1249unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1250{
399badf3 1251 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1252 switch (cr) {
1253 case 0:
1254 return vcpu->cr0;
1255 case 2:
1256 return vcpu->cr2;
1257 case 3:
1258 return vcpu->cr3;
1259 case 4:
1260 return vcpu->cr4;
1261 default:
1262 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1263 return 0;
1264 }
1265}
1266
1267void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1268 unsigned long *rflags)
1269{
1270 switch (cr) {
1271 case 0:
1272 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1273 *rflags = kvm_arch_ops->get_rflags(vcpu);
1274 break;
1275 case 2:
1276 vcpu->cr2 = val;
1277 break;
1278 case 3:
1279 set_cr3(vcpu, val);
1280 break;
1281 case 4:
1282 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1283 break;
1284 default:
1285 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1286 }
1287}
1288
102d8325
IM		 1289/*
1290 * Register the para guest with the host:
1291 */
1292static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1293{
1294 struct kvm_vcpu_para_state *para_state;
1295 hpa_t para_state_hpa, hypercall_hpa;
1296 struct page *para_state_page;
1297 unsigned char *hypercall;
1298 gpa_t hypercall_gpa;
1299
1300 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1301 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1302
1303 /*
1304 * Needs to be page aligned:
1305 */
1306 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1307 goto err_gp;
1308
1309 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1310 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1311 if (is_error_hpa(para_state_hpa))
1312 goto err_gp;
1313
ab51a434 1314 mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
102d8325
IM		 1315 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1316 para_state = kmap_atomic(para_state_page, KM_USER0);
1317
1318 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1319 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1320
1321 para_state->host_version = KVM_PARA_API_VERSION;
1322 /*
1323 * We cannot support guests that try to register themselves
1324 * with a newer API version than the host supports:
1325 */
1326 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1327 para_state->ret = -KVM_EINVAL;
1328 goto err_kunmap_skip;
1329 }
1330
1331 hypercall_gpa = para_state->hypercall_gpa;
1332 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1333 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1334 if (is_error_hpa(hypercall_hpa)) {
1335 para_state->ret = -KVM_EINVAL;
1336 goto err_kunmap_skip;
1337 }
1338
1339 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1340 vcpu->para_state_page = para_state_page;
1341 vcpu->para_state_gpa = para_state_gpa;
1342 vcpu->hypercall_gpa = hypercall_gpa;
1343
ab51a434 1344 mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
102d8325
IM		 1345 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1346 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1347 kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1348 kunmap_atomic(hypercall, KM_USER1);
1349
1350 para_state->ret = 0;
1351err_kunmap_skip:
1352 kunmap_atomic(para_state, KM_USER0);
1353 return 0;
1354err_gp:
1355 return 1;
1356}
1357
3bab1f5d
AK		 1358int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1359{
1360 u64 data;
1361
1362 switch (msr) {
1363 case 0xc0010010: /* SYSCFG */
1364 case 0xc0010015: /* HWCR */
1365 case MSR_IA32_PLATFORM_ID:
1366 case MSR_IA32_P5_MC_ADDR:
1367 case MSR_IA32_P5_MC_TYPE:
1368 case MSR_IA32_MC0_CTL:
1369 case MSR_IA32_MCG_STATUS:
1370 case MSR_IA32_MCG_CAP:
1371 case MSR_IA32_MC0_MISC:
1372 case MSR_IA32_MC0_MISC+4:
1373 case MSR_IA32_MC0_MISC+8:
1374 case MSR_IA32_MC0_MISC+12:
1375 case MSR_IA32_MC0_MISC+16:
1376 case MSR_IA32_UCODE_REV:
a8d13ea2 1377 case MSR_IA32_PERF_STATUS:
3bab1f5d
AK		 1378 /* MTRR registers */
1379 case 0xfe:
1380 case 0x200 ... 0x2ff:
1381 data = 0;
1382 break;
a8d13ea2
AK		 1383 case 0xcd: /* fsb frequency */
1384 data = 3;
1385 break;
3bab1f5d
AK		 1386 case MSR_IA32_APICBASE:
1387 data = vcpu->apic_base;
1388 break;
6f00e68f
AK		 1389 case MSR_IA32_MISC_ENABLE:
1390 data = vcpu->ia32_misc_enable_msr;
1391 break;
3bab1f5d
AK		 1392#ifdef CONFIG_X86_64
1393 case MSR_EFER:
1394 data = vcpu->shadow_efer;
1395 break;
1396#endif
1397 default:
1398 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1399 return 1;
1400 }
1401 *pdata = data;
1402 return 0;
1403}
1404EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1405
6aa8b732
AK		 1406/*
1407 * Reads an msr value (of 'msr_index') into 'pdata'.
1408 * Returns 0 on success, non-0 otherwise.
1409 * Assumes vcpu_load() was already called.
1410 */
1411static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1412{
1413 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1414}
1415
05b3e0c2 1416#ifdef CONFIG_X86_64
6aa8b732 1417
3bab1f5d 1418static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1419{
6aa8b732
AK		 1420 if (efer & EFER_RESERVED_BITS) {
1421 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1422 efer);
1423 inject_gp(vcpu);
1424 return;
1425 }
1426
1427 if (is_paging(vcpu)
1428 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1429 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1430 inject_gp(vcpu);
1431 return;
1432 }
1433
7725f0ba
AK		 1434 kvm_arch_ops->set_efer(vcpu, efer);
1435
6aa8b732
AK		 1436 efer &= ~EFER_LMA;
1437 efer |= vcpu->shadow_efer & EFER_LMA;
1438
1439 vcpu->shadow_efer = efer;
6aa8b732 1440}
6aa8b732
AK		 1441
1442#endif
1443
3bab1f5d
AK		 1444int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1445{
1446 switch (msr) {
1447#ifdef CONFIG_X86_64
1448 case MSR_EFER:
1449 set_efer(vcpu, data);
1450 break;
1451#endif
1452 case MSR_IA32_MC0_STATUS:
1453 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1454 __FUNCTION__, data);
1455 break;
1456 case MSR_IA32_UCODE_REV:
1457 case MSR_IA32_UCODE_WRITE:
1458 case 0x200 ... 0x2ff: /* MTRRs */
1459 break;
1460 case MSR_IA32_APICBASE:
1461 vcpu->apic_base = data;
1462 break;
6f00e68f
AK		 1463 case MSR_IA32_MISC_ENABLE:
1464 vcpu->ia32_misc_enable_msr = data;
1465 break;
102d8325
IM		 1466 /*
1467 * This is the 'probe whether the host is KVM' logic:
1468 */
1469 case MSR_KVM_API_MAGIC:
1470 return vcpu_register_para(vcpu, data);
1471
3bab1f5d
AK		 1472 default:
1473 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1474 return 1;
1475 }
1476 return 0;
1477}
1478EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1479
6aa8b732
AK		 1480/*
1481 * Writes msr value into into the appropriate "register".
1482 * Returns 0 on success, non-0 otherwise.
1483 * Assumes vcpu_load() was already called.
1484 */
1485static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1486{
1487 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1488}
1489
1490void kvm_resched(struct kvm_vcpu *vcpu)
1491{
1492 vcpu_put(vcpu);
1493 cond_resched();
bccf2150 1494 vcpu_load(vcpu);
6aa8b732
AK		 1495}
1496EXPORT_SYMBOL_GPL(kvm_resched);
1497
1498void load_msrs(struct vmx_msr_entry *e, int n)
1499{
1500 int i;
1501
1502 for (i = 0; i < n; ++i)
1503 wrmsrl(e[i].index, e[i].data);
1504}
1505EXPORT_SYMBOL_GPL(load_msrs);
1506
1507void save_msrs(struct vmx_msr_entry *e, int n)
1508{
1509 int i;
1510
1511 for (i = 0; i < n; ++i)
1512 rdmsrl(e[i].index, e[i].data);
1513}
1514EXPORT_SYMBOL_GPL(save_msrs);
1515
06465c5a
AK		 1516void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1517{
1518 int i;
1519 u32 function;
1520 struct kvm_cpuid_entry *e, *best;
1521
1522 kvm_arch_ops->cache_regs(vcpu);
1523 function = vcpu->regs[VCPU_REGS_RAX];
1524 vcpu->regs[VCPU_REGS_RAX] = 0;
1525 vcpu->regs[VCPU_REGS_RBX] = 0;
1526 vcpu->regs[VCPU_REGS_RCX] = 0;
1527 vcpu->regs[VCPU_REGS_RDX] = 0;
1528 best = NULL;
1529 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1530 e = &vcpu->cpuid_entries[i];
1531 if (e->function == function) {
1532 best = e;
1533 break;
1534 }
1535 /*
1536 * Both basic or both extended?
1537 */
1538 if (((e->function ^ function) & 0x80000000) == 0)
1539 if (!best || e->function > best->function)
1540 best = e;
1541 }
1542 if (best) {
1543 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1544 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1545 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1546 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1547 }
1548 kvm_arch_ops->decache_regs(vcpu);
1549 kvm_arch_ops->skip_emulated_instruction(vcpu);
1550}
1551EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1552
46fc1477
AK		 1553static void complete_pio(struct kvm_vcpu *vcpu)
1554{
1555 struct kvm_io *io = &vcpu->run->io;
1556 long delta;
1557
1558 kvm_arch_ops->cache_regs(vcpu);
1559
1560 if (!io->string) {
1561 if (io->direction == KVM_EXIT_IO_IN)
1562 memcpy(&vcpu->regs[VCPU_REGS_RAX], &io->value,
1563 io->size);
1564 } else {
1565 delta = 1;
1566 if (io->rep) {
1567 delta *= io->count;
1568 /*
1569 * The size of the register should really depend on
1570 * current address size.
1571 */
1572 vcpu->regs[VCPU_REGS_RCX] -= delta;
1573 }
1574 if (io->string_down)
1575 delta = -delta;
1576 delta *= io->size;
1577 if (io->direction == KVM_EXIT_IO_IN)
1578 vcpu->regs[VCPU_REGS_RDI] += delta;
1579 else
1580 vcpu->regs[VCPU_REGS_RSI] += delta;
1581 }
1582
1583 vcpu->pio_pending = 0;
1584 vcpu->run->io_completed = 0;
1585
1586 kvm_arch_ops->decache_regs(vcpu);
1587
1588 kvm_arch_ops->skip_emulated_instruction(vcpu);
1589}
1590
bccf2150 1591static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
6aa8b732 1592{
6aa8b732
AK		 1593 int r;
1594
bccf2150 1595 vcpu_load(vcpu);
6aa8b732 1596
54810342
DL		 1597 /* re-sync apic's tpr */
1598 vcpu->cr8 = kvm_run->cr8;
1599
46fc1477
AK		 1600 if (kvm_run->io_completed) {
1601 if (vcpu->pio_pending)
1602 complete_pio(vcpu);
1603 else {
1604 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1605 vcpu->mmio_read_completed = 1;
1606 }
6aa8b732
AK		 1607 }
1608
1609 vcpu->mmio_needed = 0;
1610
b4e63f56
AK		 1611 if (kvm_run->exit_type == KVM_EXIT_TYPE_VM_EXIT
1612 && kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
1613 kvm_arch_ops->cache_regs(vcpu);
1614 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
1615 kvm_arch_ops->decache_regs(vcpu);
1616 }
1617
6aa8b732
AK		 1618 r = kvm_arch_ops->run(vcpu, kvm_run);
1619
1620 vcpu_put(vcpu);
1621 return r;
1622}
1623
bccf2150
AK		 1624static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
1625 struct kvm_regs *regs)
6aa8b732 1626{
bccf2150 1627 vcpu_load(vcpu);
6aa8b732
AK		 1628
1629 kvm_arch_ops->cache_regs(vcpu);
1630
1631 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1632 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1633 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1634 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1635 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1636 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1637 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1638 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1639#ifdef CONFIG_X86_64
6aa8b732
AK		 1640 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1641 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1642 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1643 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1644 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1645 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1646 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1647 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1648#endif
1649
1650 regs->rip = vcpu->rip;
1651 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1652
1653 /*
1654 * Don't leak debug flags in case they were set for guest debugging
1655 */
1656 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1657 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1658
1659 vcpu_put(vcpu);
1660
1661 return 0;
1662}
1663
bccf2150
AK		 1664static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
1665 struct kvm_regs *regs)
6aa8b732 1666{
bccf2150 1667 vcpu_load(vcpu);
6aa8b732
AK		 1668
1669 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1670 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1671 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1672 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1673 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1674 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1675 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1676 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1677#ifdef CONFIG_X86_64
6aa8b732
AK		 1678 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1679 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1680 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1681 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1682 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1683 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1684 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1685 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1686#endif
1687
1688 vcpu->rip = regs->rip;
1689 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1690
1691 kvm_arch_ops->decache_regs(vcpu);
1692
1693 vcpu_put(vcpu);
1694
1695 return 0;
1696}
1697
1698static void get_segment(struct kvm_vcpu *vcpu,
1699 struct kvm_segment *var, int seg)
1700{
1701 return kvm_arch_ops->get_segment(vcpu, var, seg);
1702}
1703
bccf2150
AK		 1704static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1705 struct kvm_sregs *sregs)
6aa8b732 1706{
6aa8b732
AK		 1707 struct descriptor_table dt;
1708
bccf2150 1709 vcpu_load(vcpu);
6aa8b732
AK		 1710
1711 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1712 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1713 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1714 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1715 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1716 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1717
1718 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1719 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1720
1721 kvm_arch_ops->get_idt(vcpu, &dt);
1722 sregs->idt.limit = dt.limit;
1723 sregs->idt.base = dt.base;
1724 kvm_arch_ops->get_gdt(vcpu, &dt);
1725 sregs->gdt.limit = dt.limit;
1726 sregs->gdt.base = dt.base;
1727
399badf3 1728 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1729 sregs->cr0 = vcpu->cr0;
1730 sregs->cr2 = vcpu->cr2;
1731 sregs->cr3 = vcpu->cr3;
1732 sregs->cr4 = vcpu->cr4;
1733 sregs->cr8 = vcpu->cr8;
1734 sregs->efer = vcpu->shadow_efer;
1735 sregs->apic_base = vcpu->apic_base;
1736
1737 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1738 sizeof sregs->interrupt_bitmap);
1739
1740 vcpu_put(vcpu);
1741
1742 return 0;
1743}
1744
1745static void set_segment(struct kvm_vcpu *vcpu,
1746 struct kvm_segment *var, int seg)
1747{
1748 return kvm_arch_ops->set_segment(vcpu, var, seg);
1749}
1750
bccf2150
AK		 1751static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
1752 struct kvm_sregs *sregs)
6aa8b732 1753{
6aa8b732
AK		 1754 int mmu_reset_needed = 0;
1755 int i;
1756 struct descriptor_table dt;
1757
bccf2150 1758 vcpu_load(vcpu);
6aa8b732
AK		 1759
1760 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1761 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1762 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1763 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1764 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1765 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1766
1767 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1768 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1769
1770 dt.limit = sregs->idt.limit;
1771 dt.base = sregs->idt.base;
1772 kvm_arch_ops->set_idt(vcpu, &dt);
1773 dt.limit = sregs->gdt.limit;
1774 dt.base = sregs->gdt.base;
1775 kvm_arch_ops->set_gdt(vcpu, &dt);
1776
1777 vcpu->cr2 = sregs->cr2;
1778 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1779 vcpu->cr3 = sregs->cr3;
1780
1781 vcpu->cr8 = sregs->cr8;
1782
1783 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 1784#ifdef CONFIG_X86_64
6aa8b732
AK		 1785 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1786#endif
1787 vcpu->apic_base = sregs->apic_base;
1788
399badf3
AK		 1789 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1790
6aa8b732
AK		 1791 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1792 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1793
1794 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1795 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 1796 if (!is_long_mode(vcpu) && is_pae(vcpu))
1797 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 1798
1799 if (mmu_reset_needed)
1800 kvm_mmu_reset_context(vcpu);
1801
1802 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1803 sizeof vcpu->irq_pending);
1804 vcpu->irq_summary = 0;
1805 for (i = 0; i < NR_IRQ_WORDS; ++i)
1806 if (vcpu->irq_pending[i])
1807 __set_bit(i, &vcpu->irq_summary);
1808
1809 vcpu_put(vcpu);
1810
1811 return 0;
1812}
1813
1814/*
1815 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1816 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 1817 *
1818 * This list is modified at module load time to reflect the
1819 * capabilities of the host cpu.
6aa8b732
AK		 1820 */
1821static u32 msrs_to_save[] = {
1822 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1823 MSR_K6_STAR,
05b3e0c2 1824#ifdef CONFIG_X86_64
6aa8b732
AK		 1825 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1826#endif
1827 MSR_IA32_TIME_STAMP_COUNTER,
1828};
1829
bf591b24
MR		 1830static unsigned num_msrs_to_save;
1831
6f00e68f
AK		 1832static u32 emulated_msrs[] = {
1833 MSR_IA32_MISC_ENABLE,
1834};
1835
bf591b24
MR		 1836static __init void kvm_init_msr_list(void)
1837{
1838 u32 dummy[2];
1839 unsigned i, j;
1840
1841 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1842 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1843 continue;
1844 if (j < i)
1845 msrs_to_save[j] = msrs_to_save[i];
1846 j++;
1847 }
1848 num_msrs_to_save = j;
1849}
6aa8b732
AK		 1850
1851/*
1852 * Adapt set_msr() to msr_io()'s calling convention
1853 */
1854static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1855{
1856 return set_msr(vcpu, index, *data);
1857}
1858
1859/*
1860 * Read or write a bunch of msrs. All parameters are kernel addresses.
1861 *
1862 * @return number of msrs set successfully.
1863 */
bccf2150 1864static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
6aa8b732
AK		 1865 struct kvm_msr_entry *entries,
1866 int (*do_msr)(struct kvm_vcpu *vcpu,
1867 unsigned index, u64 *data))
1868{
6aa8b732
AK		 1869 int i;
1870
bccf2150 1871 vcpu_load(vcpu);
6aa8b732
AK		 1872
1873 for (i = 0; i < msrs->nmsrs; ++i)
1874 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1875 break;
1876
1877 vcpu_put(vcpu);
1878
1879 return i;
1880}
1881
1882/*
1883 * Read or write a bunch of msrs. Parameters are user addresses.
1884 *
1885 * @return number of msrs set successfully.
1886 */
bccf2150 1887static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
6aa8b732
AK		 1888 int (*do_msr)(struct kvm_vcpu *vcpu,
1889 unsigned index, u64 *data),
1890 int writeback)
1891{
1892 struct kvm_msrs msrs;
1893 struct kvm_msr_entry *entries;
1894 int r, n;
1895 unsigned size;
1896
1897 r = -EFAULT;
1898 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1899 goto out;
1900
1901 r = -E2BIG;
1902 if (msrs.nmsrs >= MAX_IO_MSRS)
1903 goto out;
1904
1905 r = -ENOMEM;
1906 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1907 entries = vmalloc(size);
1908 if (!entries)
1909 goto out;
1910
1911 r = -EFAULT;
1912 if (copy_from_user(entries, user_msrs->entries, size))
1913 goto out_free;
1914
bccf2150 1915 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
6aa8b732
AK		 1916 if (r < 0)
1917 goto out_free;
1918
1919 r = -EFAULT;
1920 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1921 goto out_free;
1922
1923 r = n;
1924
1925out_free:
1926 vfree(entries);
1927out:
1928 return r;
1929}
1930
1931/*
1932 * Translate a guest virtual address to a guest physical address.
1933 */
bccf2150
AK		 1934static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
1935 struct kvm_translation *tr)
6aa8b732
AK		 1936{
1937 unsigned long vaddr = tr->linear_address;
6aa8b732
AK		 1938 gpa_t gpa;
1939
bccf2150
AK		 1940 vcpu_load(vcpu);
1941 spin_lock(&vcpu->kvm->lock);
6aa8b732
AK		 1942 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1943 tr->physical_address = gpa;
1944 tr->valid = gpa != UNMAPPED_GVA;
1945 tr->writeable = 1;
1946 tr->usermode = 0;
bccf2150 1947 spin_unlock(&vcpu->kvm->lock);
6aa8b732
AK		 1948 vcpu_put(vcpu);
1949
1950 return 0;
1951}
1952
bccf2150
AK		 1953static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
1954 struct kvm_interrupt *irq)
6aa8b732 1955{
6aa8b732
AK		 1956 if (irq->irq < 0 || irq->irq >= 256)
1957 return -EINVAL;
bccf2150 1958 vcpu_load(vcpu);
6aa8b732
AK		 1959
1960 set_bit(irq->irq, vcpu->irq_pending);
1961 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1962
1963 vcpu_put(vcpu);
1964
1965 return 0;
1966}
1967
bccf2150
AK		 1968static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
1969 struct kvm_debug_guest *dbg)
6aa8b732 1970{
6aa8b732
AK		 1971 int r;
1972
bccf2150 1973 vcpu_load(vcpu);
6aa8b732
AK		 1974
1975 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1976
1977 vcpu_put(vcpu);
1978
1979 return r;
1980}
1981
9a2bb7f4
AK		 1982static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
1983 unsigned long address,
1984 int *type)
1985{
1986 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1987 unsigned long pgoff;
1988 struct page *page;
1989
1990 *type = VM_FAULT_MINOR;
1991 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1992 if (pgoff != 0)
1993 return NOPAGE_SIGBUS;
1994 page = virt_to_page(vcpu->run);
1995 get_page(page);
1996 return page;
1997}
1998
1999static struct vm_operations_struct kvm_vcpu_vm_ops = {
2000 .nopage = kvm_vcpu_nopage,
2001};
2002
2003static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2004{
2005 vma->vm_ops = &kvm_vcpu_vm_ops;
2006 return 0;
2007}
2008
bccf2150
AK		 2009static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2010{
2011 struct kvm_vcpu *vcpu = filp->private_data;
2012
2013 fput(vcpu->kvm->filp);
2014 return 0;
2015}
2016
2017static struct file_operations kvm_vcpu_fops = {
2018 .release = kvm_vcpu_release,
2019 .unlocked_ioctl = kvm_vcpu_ioctl,
2020 .compat_ioctl = kvm_vcpu_ioctl,
9a2bb7f4 2021 .mmap = kvm_vcpu_mmap,
bccf2150
AK		 2022};
2023
2024/*
2025 * Allocates an inode for the vcpu.
2026 */
2027static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2028{
2029 int fd, r;
2030 struct inode *inode;
2031 struct file *file;
2032
2033 atomic_inc(&vcpu->kvm->filp->f_count);
2034 inode = kvmfs_inode(&kvm_vcpu_fops);
2035 if (IS_ERR(inode)) {
2036 r = PTR_ERR(inode);
2037 goto out1;
2038 }
2039
2040 file = kvmfs_file(inode, vcpu);
2041 if (IS_ERR(file)) {
2042 r = PTR_ERR(file);
2043 goto out2;
2044 }
2045
2046 r = get_unused_fd();
2047 if (r < 0)
2048 goto out3;
2049 fd = r;
2050 fd_install(fd, file);
2051
2052 return fd;
2053
2054out3:
2055 fput(file);
2056out2:
2057 iput(inode);
2058out1:
2059 fput(vcpu->kvm->filp);
2060 return r;
2061}
2062
c5ea7660
AK		 2063/*
2064 * Creates some virtual cpus. Good luck creating more than one.
2065 */
2066static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2067{
2068 int r;
2069 struct kvm_vcpu *vcpu;
9a2bb7f4 2070 struct page *page;
c5ea7660
AK		 2071
2072 r = -EINVAL;
2073 if (!valid_vcpu(n))
2074 goto out;
2075
2076 vcpu = &kvm->vcpus[n];
2077
2078 mutex_lock(&vcpu->mutex);
2079
2080 if (vcpu->vmcs) {
2081 mutex_unlock(&vcpu->mutex);
2082 return -EEXIST;
2083 }
2084
9a2bb7f4
AK		 2085 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2086 r = -ENOMEM;
2087 if (!page)
2088 goto out_unlock;
2089 vcpu->run = page_address(page);
2090
c5ea7660
AK		 2091 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
2092 FX_IMAGE_ALIGN);
2093 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
2094
2095 r = kvm_arch_ops->vcpu_create(vcpu);
2096 if (r < 0)
2097 goto out_free_vcpus;
2098
2099 r = kvm_mmu_create(vcpu);
2100 if (r < 0)
2101 goto out_free_vcpus;
2102
2103 kvm_arch_ops->vcpu_load(vcpu);
2104 r = kvm_mmu_setup(vcpu);
2105 if (r >= 0)
2106 r = kvm_arch_ops->vcpu_setup(vcpu);
2107 vcpu_put(vcpu);
2108
2109 if (r < 0)
2110 goto out_free_vcpus;
2111
bccf2150
AK		 2112 r = create_vcpu_fd(vcpu);
2113 if (r < 0)
2114 goto out_free_vcpus;
2115
2116 return r;
c5ea7660
AK		 2117
2118out_free_vcpus:
2119 kvm_free_vcpu(vcpu);
9a2bb7f4 2120out_unlock:
c5ea7660
AK		 2121 mutex_unlock(&vcpu->mutex);
2122out:
2123 return r;
2124}
2125
06465c5a
AK		 2126static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2127 struct kvm_cpuid *cpuid,
2128 struct kvm_cpuid_entry __user *entries)
2129{
2130 int r;
2131
2132 r = -E2BIG;
2133 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2134 goto out;
2135 r = -EFAULT;
2136 if (copy_from_user(&vcpu->cpuid_entries, entries,
2137 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2138 goto out;
2139 vcpu->cpuid_nent = cpuid->nent;
2140 return 0;
2141
2142out:
2143 return r;
2144}
2145
bccf2150
AK		 2146static long kvm_vcpu_ioctl(struct file *filp,
2147 unsigned int ioctl, unsigned long arg)
6aa8b732 2148{
bccf2150 2149 struct kvm_vcpu *vcpu = filp->private_data;
2f366987 2150 void __user *argp = (void __user *)arg;
6aa8b732
AK		 2151 int r = -EINVAL;
2152
2153 switch (ioctl) {
9a2bb7f4
AK		 2154 case KVM_RUN:
2155 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
6aa8b732 2156 break;
6aa8b732
AK		 2157 case KVM_GET_REGS: {
2158 struct kvm_regs kvm_regs;
2159
bccf2150
AK		 2160 memset(&kvm_regs, 0, sizeof kvm_regs);
2161 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2162 if (r)
2163 goto out;
2164 r = -EFAULT;
2f366987 2165 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 2166 goto out;
2167 r = 0;
2168 break;
2169 }
2170 case KVM_SET_REGS: {
2171 struct kvm_regs kvm_regs;
2172
2173 r = -EFAULT;
2f366987 2174 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732 2175 goto out;
bccf2150 2176 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2177 if (r)
2178 goto out;
2179 r = 0;
2180 break;
2181 }
2182 case KVM_GET_SREGS: {
2183 struct kvm_sregs kvm_sregs;
2184
bccf2150
AK		 2185 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2186 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2187 if (r)
2188 goto out;
2189 r = -EFAULT;
2f366987 2190 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 2191 goto out;
2192 r = 0;
2193 break;
2194 }
2195 case KVM_SET_SREGS: {
2196 struct kvm_sregs kvm_sregs;
2197
2198 r = -EFAULT;
2f366987 2199 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732 2200 goto out;
bccf2150 2201 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2202 if (r)
2203 goto out;
2204 r = 0;
2205 break;
2206 }
2207 case KVM_TRANSLATE: {
2208 struct kvm_translation tr;
2209
2210 r = -EFAULT;
2f366987 2211 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732 2212 goto out;
bccf2150 2213 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
6aa8b732
AK		 2214 if (r)
2215 goto out;
2216 r = -EFAULT;
2f366987 2217 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 2218 goto out;
2219 r = 0;
2220 break;
2221 }
2222 case KVM_INTERRUPT: {
2223 struct kvm_interrupt irq;
2224
2225 r = -EFAULT;
2f366987 2226 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732 2227 goto out;
bccf2150 2228 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
6aa8b732
AK		 2229 if (r)
2230 goto out;
2231 r = 0;
2232 break;
2233 }
2234 case KVM_DEBUG_GUEST: {
2235 struct kvm_debug_guest dbg;
2236
2237 r = -EFAULT;
2f366987 2238 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732 2239 goto out;
bccf2150 2240 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
6aa8b732
AK		 2241 if (r)
2242 goto out;
2243 r = 0;
2244 break;
2245 }
bccf2150
AK		 2246 case KVM_GET_MSRS:
2247 r = msr_io(vcpu, argp, get_msr, 1);
2248 break;
2249 case KVM_SET_MSRS:
2250 r = msr_io(vcpu, argp, do_set_msr, 0);
2251 break;
06465c5a
AK		 2252 case KVM_SET_CPUID: {
2253 struct kvm_cpuid __user *cpuid_arg = argp;
2254 struct kvm_cpuid cpuid;
2255
2256 r = -EFAULT;
2257 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2258 goto out;
2259 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2260 if (r)
2261 goto out;
2262 break;
2263 }
bccf2150
AK		 2264 default:
2265 ;
2266 }
2267out:
2268 return r;
2269}
2270
2271static long kvm_vm_ioctl(struct file *filp,
2272 unsigned int ioctl, unsigned long arg)
2273{
2274 struct kvm *kvm = filp->private_data;
2275 void __user *argp = (void __user *)arg;
2276 int r = -EINVAL;
2277
2278 switch (ioctl) {
2279 case KVM_CREATE_VCPU:
2280 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2281 if (r < 0)
2282 goto out;
2283 break;
6aa8b732
AK		 2284 case KVM_SET_MEMORY_REGION: {
2285 struct kvm_memory_region kvm_mem;
2286
2287 r = -EFAULT;
2f366987 2288 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
6aa8b732 2289 goto out;
2c6f5df9 2290 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
6aa8b732
AK		 2291 if (r)
2292 goto out;
2293 break;
2294 }
2295 case KVM_GET_DIRTY_LOG: {
2296 struct kvm_dirty_log log;
2297
2298 r = -EFAULT;
2f366987 2299 if (copy_from_user(&log, argp, sizeof log))
6aa8b732 2300 goto out;
2c6f5df9 2301 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
6aa8b732
AK		 2302 if (r)
2303 goto out;
2304 break;
2305 }
f17abe9a
AK		 2306 default:
2307 ;
2308 }
2309out:
2310 return r;
2311}
2312
2313static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2314 unsigned long address,
2315 int *type)
2316{
2317 struct kvm *kvm = vma->vm_file->private_data;
2318 unsigned long pgoff;
2319 struct kvm_memory_slot *slot;
2320 struct page *page;
2321
2322 *type = VM_FAULT_MINOR;
2323 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2324 slot = gfn_to_memslot(kvm, pgoff);
2325 if (!slot)
2326 return NOPAGE_SIGBUS;
2327 page = gfn_to_page(slot, pgoff);
2328 if (!page)
2329 return NOPAGE_SIGBUS;
2330 get_page(page);
2331 return page;
2332}
2333
2334static struct vm_operations_struct kvm_vm_vm_ops = {
2335 .nopage = kvm_vm_nopage,
2336};
2337
2338static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2339{
2340 vma->vm_ops = &kvm_vm_vm_ops;
2341 return 0;
2342}
2343
2344static struct file_operations kvm_vm_fops = {
2345 .release = kvm_vm_release,
2346 .unlocked_ioctl = kvm_vm_ioctl,
2347 .compat_ioctl = kvm_vm_ioctl,
2348 .mmap = kvm_vm_mmap,
2349};
2350
2351static int kvm_dev_ioctl_create_vm(void)
2352{
2353 int fd, r;
2354 struct inode *inode;
2355 struct file *file;
2356 struct kvm *kvm;
2357
2358 inode = kvmfs_inode(&kvm_vm_fops);
2359 if (IS_ERR(inode)) {
2360 r = PTR_ERR(inode);
2361 goto out1;
2362 }
2363
2364 kvm = kvm_create_vm();
2365 if (IS_ERR(kvm)) {
2366 r = PTR_ERR(kvm);
2367 goto out2;
2368 }
2369
2370 file = kvmfs_file(inode, kvm);
2371 if (IS_ERR(file)) {
2372 r = PTR_ERR(file);
2373 goto out3;
2374 }
bccf2150 2375 kvm->filp = file;
f17abe9a
AK		 2376
2377 r = get_unused_fd();
2378 if (r < 0)
2379 goto out4;
2380 fd = r;
2381 fd_install(fd, file);
2382
2383 return fd;
2384
2385out4:
2386 fput(file);
2387out3:
2388 kvm_destroy_vm(kvm);
2389out2:
2390 iput(inode);
2391out1:
2392 return r;
2393}
2394
2395static long kvm_dev_ioctl(struct file *filp,
2396 unsigned int ioctl, unsigned long arg)
2397{
2398 void __user *argp = (void __user *)arg;
2399 int r = -EINVAL;
2400
2401 switch (ioctl) {
2402 case KVM_GET_API_VERSION:
2403 r = KVM_API_VERSION;
2404 break;
2405 case KVM_CREATE_VM:
2406 r = kvm_dev_ioctl_create_vm();
2407 break;
6aa8b732 2408 case KVM_GET_MSR_INDEX_LIST: {
2f366987 2409 struct kvm_msr_list __user *user_msr_list = argp;
6aa8b732
AK		 2410 struct kvm_msr_list msr_list;
2411 unsigned n;
2412
2413 r = -EFAULT;
2414 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2415 goto out;
2416 n = msr_list.nmsrs;
6f00e68f 2417 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
6aa8b732
AK		 2418 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2419 goto out;
2420 r = -E2BIG;
bf591b24 2421 if (n < num_msrs_to_save)
6aa8b732
AK		 2422 goto out;
2423 r = -EFAULT;
2424 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 2425 num_msrs_to_save * sizeof(u32)))
6aa8b732 2426 goto out;
6f00e68f
AK		 2427 if (copy_to_user(user_msr_list->indices
2428 + num_msrs_to_save * sizeof(u32),
2429 &emulated_msrs,
2430 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2431 goto out;
6aa8b732 2432 r = 0;
cc1d8955 2433 break;
6aa8b732 2434 }
5d308f45
AK		 2435 case KVM_CHECK_EXTENSION:
2436 /*
2437 * No extensions defined at present.
2438 */
2439 r = 0;
2440 break;
6aa8b732
AK		 2441 default:
2442 ;
2443 }
2444out:
2445 return r;
2446}
2447
6aa8b732
AK		 2448static struct file_operations kvm_chardev_ops = {
2449 .open = kvm_dev_open,
2450 .release = kvm_dev_release,
2451 .unlocked_ioctl = kvm_dev_ioctl,
2452 .compat_ioctl = kvm_dev_ioctl,
6aa8b732
AK		 2453};
2454
2455static struct miscdevice kvm_dev = {
bbe4432e 2456 KVM_MINOR,
6aa8b732
AK		 2457 "kvm",
2458 &kvm_chardev_ops,
2459};
2460
2461static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2462 void *v)
2463{
2464 if (val == SYS_RESTART) {
2465 /*
2466 * Some (well, at least mine) BIOSes hang on reboot if
2467 * in vmx root mode.
2468 */
2469 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
8b6d44c7 2470 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2471 }
2472 return NOTIFY_OK;
2473}
2474
2475static struct notifier_block kvm_reboot_notifier = {
2476 .notifier_call = kvm_reboot,
2477 .priority = 0,
2478};
2479
774c47f1
AK		 2480/*
2481 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2482 * cached on it.
2483 */
2484static void decache_vcpus_on_cpu(int cpu)
2485{
2486 struct kvm *vm;
2487 struct kvm_vcpu *vcpu;
2488 int i;
2489
2490 spin_lock(&kvm_lock);
2491 list_for_each_entry(vm, &vm_list, vm_list)
2492 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2493 vcpu = &vm->vcpus[i];
2494 /*
2495 * If the vcpu is locked, then it is running on some
2496 * other cpu and therefore it is not cached on the
2497 * cpu in question.
2498 *
2499 * If it's not locked, check the last cpu it executed
2500 * on.
2501 */
2502 if (mutex_trylock(&vcpu->mutex)) {
2503 if (vcpu->cpu == cpu) {
2504 kvm_arch_ops->vcpu_decache(vcpu);
2505 vcpu->cpu = -1;
2506 }
2507 mutex_unlock(&vcpu->mutex);
2508 }
2509 }
2510 spin_unlock(&kvm_lock);
2511}
2512
2513static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2514 void *v)
2515{
2516 int cpu = (long)v;
2517
2518 switch (val) {
43934a38 2519 case CPU_DOWN_PREPARE:
774c47f1 2520 case CPU_UP_CANCELED:
43934a38
JK		 2521 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2522 cpu);
774c47f1
AK		 2523 decache_vcpus_on_cpu(cpu);
2524 smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
2525 NULL, 0, 1);
2526 break;
43934a38
JK		 2527 case CPU_ONLINE:
2528 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2529 cpu);
774c47f1
AK		 2530 smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
2531 NULL, 0, 1);
2532 break;
2533 }
2534 return NOTIFY_OK;
2535}
2536
2537static struct notifier_block kvm_cpu_notifier = {
2538 .notifier_call = kvm_cpu_hotplug,
2539 .priority = 20, /* must be > scheduler priority */
2540};
2541
6aa8b732
AK		 2542static __init void kvm_init_debug(void)
2543{
2544 struct kvm_stats_debugfs_item *p;
2545
8b6d44c7 2546 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732
AK		 2547 for (p = debugfs_entries; p->name; ++p)
2548 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
2549 p->data);
2550}
2551
2552static void kvm_exit_debug(void)
2553{
2554 struct kvm_stats_debugfs_item *p;
2555
2556 for (p = debugfs_entries; p->name; ++p)
2557 debugfs_remove(p->dentry);
2558 debugfs_remove(debugfs_dir);
2559}
2560
59ae6c6b
AK		 2561static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2562{
2563 decache_vcpus_on_cpu(raw_smp_processor_id());
19d1408d 2564 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
59ae6c6b
AK		 2565 return 0;
2566}
2567
2568static int kvm_resume(struct sys_device *dev)
2569{
19d1408d 2570 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
59ae6c6b
AK		 2571 return 0;
2572}
2573
2574static struct sysdev_class kvm_sysdev_class = {
2575 set_kset_name("kvm"),
2576 .suspend = kvm_suspend,
2577 .resume = kvm_resume,
2578};
2579
2580static struct sys_device kvm_sysdev = {
2581 .id = 0,
2582 .cls = &kvm_sysdev_class,
2583};
2584
6aa8b732
AK		 2585hpa_t bad_page_address;
2586
37e29d90
AK		 2587static int kvmfs_get_sb(struct file_system_type *fs_type, int flags,
2588 const char *dev_name, void *data, struct vfsmount *mnt)
2589{
e9cdb1e3 2590 return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_SUPER_MAGIC, mnt);
37e29d90
AK		 2591}
2592
2593static struct file_system_type kvm_fs_type = {
2594 .name = "kvmfs",
2595 .get_sb = kvmfs_get_sb,
2596 .kill_sb = kill_anon_super,
2597};
2598
6aa8b732
AK		 2599int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
2600{
2601 int r;
2602
09db28b8
YI		 2603 if (kvm_arch_ops) {
2604 printk(KERN_ERR "kvm: already loaded the other module\n");
2605 return -EEXIST;
2606 }
2607
e097f35c 2608 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 2609 printk(KERN_ERR "kvm: no hardware support\n");
2610 return -EOPNOTSUPP;
2611 }
e097f35c 2612 if (ops->disabled_by_bios()) {
6aa8b732
AK		 2613 printk(KERN_ERR "kvm: disabled by bios\n");
2614 return -EOPNOTSUPP;
2615 }
2616
e097f35c
YI		 2617 kvm_arch_ops = ops;
2618
6aa8b732
AK		 2619 r = kvm_arch_ops->hardware_setup();
2620 if (r < 0)
ca45aaae 2621 goto out;
6aa8b732 2622
8b6d44c7 2623 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
774c47f1
AK		 2624 r = register_cpu_notifier(&kvm_cpu_notifier);
2625 if (r)
2626 goto out_free_1;
6aa8b732
AK		 2627 register_reboot_notifier(&kvm_reboot_notifier);
2628
59ae6c6b
AK		 2629 r = sysdev_class_register(&kvm_sysdev_class);
2630 if (r)
2631 goto out_free_2;
2632
2633 r = sysdev_register(&kvm_sysdev);
2634 if (r)
2635 goto out_free_3;
2636
6aa8b732
AK		 2637 kvm_chardev_ops.owner = module;
2638
2639 r = misc_register(&kvm_dev);
2640 if (r) {
2641 printk (KERN_ERR "kvm: misc device register failed\n");
2642 goto out_free;
2643 }
2644
2645 return r;
2646
2647out_free:
59ae6c6b
AK		 2648 sysdev_unregister(&kvm_sysdev);
2649out_free_3:
2650 sysdev_class_unregister(&kvm_sysdev_class);
2651out_free_2:
6aa8b732 2652 unregister_reboot_notifier(&kvm_reboot_notifier);
774c47f1
AK		 2653 unregister_cpu_notifier(&kvm_cpu_notifier);
2654out_free_1:
8b6d44c7 2655 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 2656 kvm_arch_ops->hardware_unsetup();
ca45aaae
AK		 2657out:
2658 kvm_arch_ops = NULL;
6aa8b732
AK		 2659 return r;
2660}
2661
2662void kvm_exit_arch(void)
2663{
2664 misc_deregister(&kvm_dev);
59ae6c6b
AK		 2665 sysdev_unregister(&kvm_sysdev);
2666 sysdev_class_unregister(&kvm_sysdev_class);
6aa8b732 2667 unregister_reboot_notifier(&kvm_reboot_notifier);
59ae6c6b 2668 unregister_cpu_notifier(&kvm_cpu_notifier);
8b6d44c7 2669 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 2670 kvm_arch_ops->hardware_unsetup();
09db28b8 2671 kvm_arch_ops = NULL;
6aa8b732
AK		 2672}
2673
2674static __init int kvm_init(void)
2675{
2676 static struct page *bad_page;
37e29d90
AK		 2677 int r;
2678
2679 r = register_filesystem(&kvm_fs_type);
2680 if (r)
2681 goto out3;
6aa8b732 2682
37e29d90
AK		 2683 kvmfs_mnt = kern_mount(&kvm_fs_type);
2684 r = PTR_ERR(kvmfs_mnt);
2685 if (IS_ERR(kvmfs_mnt))
2686 goto out2;
6aa8b732
AK		 2687 kvm_init_debug();
2688
bf591b24
MR		 2689 kvm_init_msr_list();
2690
6aa8b732
AK		 2691 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2692 r = -ENOMEM;
2693 goto out;
2694 }
2695
2696 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2697 memset(__va(bad_page_address), 0, PAGE_SIZE);
2698
58e690e6 2699 return 0;
6aa8b732
AK		 2700
2701out:
2702 kvm_exit_debug();
37e29d90
AK		 2703 mntput(kvmfs_mnt);
2704out2:
2705 unregister_filesystem(&kvm_fs_type);
2706out3:
6aa8b732
AK		 2707 return r;
2708}
2709
2710static __exit void kvm_exit(void)
2711{
2712 kvm_exit_debug();
2713 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
37e29d90
AK		 2714 mntput(kvmfs_mnt);
2715 unregister_filesystem(&kvm_fs_type);
6aa8b732
AK		 2716}
2717
2718module_init(kvm_init)
2719module_exit(kvm_exit)
2720
2721EXPORT_SYMBOL_GPL(kvm_init_arch);
2722EXPORT_SYMBOL_GPL(kvm_exit_arch);
Linux kernel - Deliverables
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