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KVM: Implement emulation of instruction "ret" (opcode 0xc3)
[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>
e8edc6e0 43#include <linux/sched.h>
d9e368d6
AK		 44#include <linux/cpumask.h>
45#include <linux/smp.h>
6aa8b732
AK		 46
47#include "x86_emulate.h"
48#include "segment_descriptor.h"
49
50MODULE_AUTHOR("Qumranet");
51MODULE_LICENSE("GPL");
52
133de902
AK		 53static DEFINE_SPINLOCK(kvm_lock);
54static LIST_HEAD(vm_list);
55
6aa8b732 56struct kvm_arch_ops *kvm_arch_ops;
1165f5fe
AK		 57
58#define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
6aa8b732
AK		 59
60static struct kvm_stats_debugfs_item {
61 const char *name;
1165f5fe 62 int offset;
6aa8b732
AK		 63 struct dentry *dentry;
64} debugfs_entries[] = {
1165f5fe
AK		 65 { "pf_fixed", STAT_OFFSET(pf_fixed) },
66 { "pf_guest", STAT_OFFSET(pf_guest) },
67 { "tlb_flush", STAT_OFFSET(tlb_flush) },
68 { "invlpg", STAT_OFFSET(invlpg) },
69 { "exits", STAT_OFFSET(exits) },
70 { "io_exits", STAT_OFFSET(io_exits) },
71 { "mmio_exits", STAT_OFFSET(mmio_exits) },
72 { "signal_exits", STAT_OFFSET(signal_exits) },
73 { "irq_window", STAT_OFFSET(irq_window_exits) },
74 { "halt_exits", STAT_OFFSET(halt_exits) },
75 { "request_irq", STAT_OFFSET(request_irq_exits) },
76 { "irq_exits", STAT_OFFSET(irq_exits) },
e6adf283 77 { "light_exits", STAT_OFFSET(light_exits) },
2cc51560 78 { "efer_reload", STAT_OFFSET(efer_reload) },
1165f5fe 79 { NULL }
6aa8b732
AK		 80};
81
82static struct dentry *debugfs_dir;
83
37e29d90
AK		 84struct vfsmount *kvmfs_mnt;
85
6aa8b732
AK		 86#define MAX_IO_MSRS 256
87
88#define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
89#define LMSW_GUEST_MASK 0x0eULL
90#define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
91#define CR8_RESEVED_BITS (~0x0fULL)
92#define EFER_RESERVED_BITS 0xfffffffffffff2fe
93
05b3e0c2 94#ifdef CONFIG_X86_64
6aa8b732
AK		 95// LDT or TSS descriptor in the GDT. 16 bytes.
96struct segment_descriptor_64 {
97 struct segment_descriptor s;
98 u32 base_higher;
99 u32 pad_zero;
100};
101
102#endif
103
bccf2150
AK		 104static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
105 unsigned long arg);
106
f17abe9a
AK		 107static struct inode *kvmfs_inode(struct file_operations *fops)
108{
109 int error = -ENOMEM;
110 struct inode *inode = new_inode(kvmfs_mnt->mnt_sb);
111
112 if (!inode)
113 goto eexit_1;
114
115 inode->i_fop = fops;
116
117 /*
118 * Mark the inode dirty from the very beginning,
119 * that way it will never be moved to the dirty
120 * list because mark_inode_dirty() will think
121 * that it already _is_ on the dirty list.
122 */
123 inode->i_state = I_DIRTY;
124 inode->i_mode = S_IRUSR | S_IWUSR;
125 inode->i_uid = current->fsuid;
126 inode->i_gid = current->fsgid;
127 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
128 return inode;
129
130eexit_1:
131 return ERR_PTR(error);
132}
133
134static struct file *kvmfs_file(struct inode *inode, void *private_data)
135{
136 struct file *file = get_empty_filp();
137
138 if (!file)
139 return ERR_PTR(-ENFILE);
140
141 file->f_path.mnt = mntget(kvmfs_mnt);
142 file->f_path.dentry = d_alloc_anon(inode);
143 if (!file->f_path.dentry)
144 return ERR_PTR(-ENOMEM);
145 file->f_mapping = inode->i_mapping;
146
147 file->f_pos = 0;
148 file->f_flags = O_RDWR;
149 file->f_op = inode->i_fop;
150 file->f_mode = FMODE_READ | FMODE_WRITE;
151 file->f_version = 0;
152 file->private_data = private_data;
153 return file;
154}
155
6aa8b732
AK		 156unsigned long segment_base(u16 selector)
157{
158 struct descriptor_table gdt;
159 struct segment_descriptor *d;
160 unsigned long table_base;
161 typedef unsigned long ul;
162 unsigned long v;
163
164 if (selector == 0)
165 return 0;
166
167 asm ("sgdt %0" : "=m"(gdt));
168 table_base = gdt.base;
169
170 if (selector & 4) { /* from ldt */
171 u16 ldt_selector;
172
173 asm ("sldt %0" : "=g"(ldt_selector));
174 table_base = segment_base(ldt_selector);
175 }
176 d = (struct segment_descriptor *)(table_base + (selector & ~7));
177 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
05b3e0c2 178#ifdef CONFIG_X86_64
6aa8b732
AK		 179 if (d->system == 0
180 && (d->type == 2 || d->type == 9 || d->type == 11))
181 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
182#endif
183 return v;
184}
185EXPORT_SYMBOL_GPL(segment_base);
186
5aacf0ca
JM		 187static inline int valid_vcpu(int n)
188{
189 return likely(n >= 0 && n < KVM_MAX_VCPUS);
190}
191
d27d4aca
AK		 192int kvm_read_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
193 void *dest)
6aa8b732
AK		 194{
195 unsigned char *host_buf = dest;
196 unsigned long req_size = size;
197
198 while (size) {
199 hpa_t paddr;
200 unsigned now;
201 unsigned offset;
202 hva_t guest_buf;
203
204 paddr = gva_to_hpa(vcpu, addr);
205
206 if (is_error_hpa(paddr))
207 break;
208
209 guest_buf = (hva_t)kmap_atomic(
210 pfn_to_page(paddr >> PAGE_SHIFT),
211 KM_USER0);
212 offset = addr & ~PAGE_MASK;
213 guest_buf |= offset;
214 now = min(size, PAGE_SIZE - offset);
215 memcpy(host_buf, (void*)guest_buf, now);
216 host_buf += now;
217 addr += now;
218 size -= now;
219 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
220 }
221 return req_size - size;
222}
223EXPORT_SYMBOL_GPL(kvm_read_guest);
224
d27d4aca
AK		 225int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
226 void *data)
6aa8b732
AK		 227{
228 unsigned char *host_buf = data;
229 unsigned long req_size = size;
230
231 while (size) {
232 hpa_t paddr;
233 unsigned now;
234 unsigned offset;
235 hva_t guest_buf;
ab51a434 236 gfn_t gfn;
6aa8b732
AK		 237
238 paddr = gva_to_hpa(vcpu, addr);
239
240 if (is_error_hpa(paddr))
241 break;
242
ab51a434
UL		 243 gfn = vcpu->mmu.gva_to_gpa(vcpu, addr) >> PAGE_SHIFT;
244 mark_page_dirty(vcpu->kvm, gfn);
6aa8b732
AK		 245 guest_buf = (hva_t)kmap_atomic(
246 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
247 offset = addr & ~PAGE_MASK;
248 guest_buf |= offset;
249 now = min(size, PAGE_SIZE - offset);
250 memcpy((void*)guest_buf, host_buf, now);
251 host_buf += now;
252 addr += now;
253 size -= now;
254 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
255 }
256 return req_size - size;
257}
258EXPORT_SYMBOL_GPL(kvm_write_guest);
259
7702fd1f
AK		 260void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
261{
262 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
263 return;
264
265 vcpu->guest_fpu_loaded = 1;
266 fx_save(vcpu->host_fx_image);
267 fx_restore(vcpu->guest_fx_image);
268}
269EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
270
271void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
272{
273 if (!vcpu->guest_fpu_loaded)
274 return;
275
276 vcpu->guest_fpu_loaded = 0;
277 fx_save(vcpu->guest_fx_image);
278 fx_restore(vcpu->host_fx_image);
279}
280EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
281
bccf2150
AK		 282/*
283 * Switches to specified vcpu, until a matching vcpu_put()
284 */
285static void vcpu_load(struct kvm_vcpu *vcpu)
6aa8b732 286{
bccf2150
AK		 287 mutex_lock(&vcpu->mutex);
288 kvm_arch_ops->vcpu_load(vcpu);
6aa8b732
AK		 289}
290
291/*
bccf2150
AK		 292 * Switches to specified vcpu, until a matching vcpu_put(). Will return NULL
293 * if the slot is not populated.
6aa8b732 294 */
bccf2150 295static struct kvm_vcpu *vcpu_load_slot(struct kvm *kvm, int slot)
6aa8b732 296{
bccf2150 297 struct kvm_vcpu *vcpu = &kvm->vcpus[slot];
6aa8b732
AK		 298
299 mutex_lock(&vcpu->mutex);
bccf2150 300 if (!vcpu->vmcs) {
6aa8b732 301 mutex_unlock(&vcpu->mutex);
8b6d44c7 302 return NULL;
6aa8b732 303 }
bccf2150
AK		 304 kvm_arch_ops->vcpu_load(vcpu);
305 return vcpu;
6aa8b732
AK		 306}
307
308static void vcpu_put(struct kvm_vcpu *vcpu)
309{
310 kvm_arch_ops->vcpu_put(vcpu);
6aa8b732
AK		 311 mutex_unlock(&vcpu->mutex);
312}
313
d9e368d6
AK		 314static void ack_flush(void *_completed)
315{
316 atomic_t *completed = _completed;
317
318 atomic_inc(completed);
319}
320
321void kvm_flush_remote_tlbs(struct kvm *kvm)
322{
323 int i, cpu, needed;
324 cpumask_t cpus;
325 struct kvm_vcpu *vcpu;
326 atomic_t completed;
327
328 atomic_set(&completed, 0);
329 cpus_clear(cpus);
330 needed = 0;
331 for (i = 0; i < kvm->nvcpus; ++i) {
332 vcpu = &kvm->vcpus[i];
333 if (test_and_set_bit(KVM_TLB_FLUSH, &vcpu->requests))
334 continue;
335 cpu = vcpu->cpu;
336 if (cpu != -1 && cpu != raw_smp_processor_id())
337 if (!cpu_isset(cpu, cpus)) {
338 cpu_set(cpu, cpus);
339 ++needed;
340 }
341 }
342
343 /*
344 * We really want smp_call_function_mask() here. But that's not
345 * available, so ipi all cpus in parallel and wait for them
346 * to complete.
347 */
348 for (cpu = first_cpu(cpus); cpu != NR_CPUS; cpu = next_cpu(cpu, cpus))
349 smp_call_function_single(cpu, ack_flush, &completed, 1, 0);
350 while (atomic_read(&completed) != needed) {
351 cpu_relax();
352 barrier();
353 }
354}
355
f17abe9a 356static struct kvm *kvm_create_vm(void)
6aa8b732
AK		 357{
358 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
359 int i;
360
361 if (!kvm)
f17abe9a 362 return ERR_PTR(-ENOMEM);
6aa8b732
AK		 363
364 spin_lock_init(&kvm->lock);
365 INIT_LIST_HEAD(&kvm->active_mmu_pages);
120e9a45
AK		 366 spin_lock(&kvm_lock);
367 list_add(&kvm->vm_list, &vm_list);
368 spin_unlock(&kvm_lock);
6aa8b732
AK		 369 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
370 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
371
372 mutex_init(&vcpu->mutex);
133de902 373 vcpu->cpu = -1;
86a2b42e 374 vcpu->kvm = kvm;
6aa8b732 375 vcpu->mmu.root_hpa = INVALID_PAGE;
6aa8b732 376 }
f17abe9a
AK		 377 return kvm;
378}
379
380static int kvm_dev_open(struct inode *inode, struct file *filp)
381{
6aa8b732
AK		 382 return 0;
383}
384
385/*
386 * Free any memory in @free but not in @dont.
387 */
388static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
389 struct kvm_memory_slot *dont)
390{
391 int i;
392
393 if (!dont || free->phys_mem != dont->phys_mem)
394 if (free->phys_mem) {
395 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 396 if (free->phys_mem[i])
397 __free_page(free->phys_mem[i]);
6aa8b732
AK		 398 vfree(free->phys_mem);
399 }
400
401 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
402 vfree(free->dirty_bitmap);
403
8b6d44c7 404 free->phys_mem = NULL;
6aa8b732 405 free->npages = 0;
8b6d44c7 406 free->dirty_bitmap = NULL;
6aa8b732
AK		 407}
408
409static void kvm_free_physmem(struct kvm *kvm)
410{
411 int i;
412
413 for (i = 0; i < kvm->nmemslots; ++i)
8b6d44c7 414 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
6aa8b732
AK		 415}
416
039576c0
AK		 417static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
418{
419 int i;
420
421 for (i = 0; i < 2; ++i)
422 if (vcpu->pio.guest_pages[i]) {
423 __free_page(vcpu->pio.guest_pages[i]);
424 vcpu->pio.guest_pages[i] = NULL;
425 }
426}
427
7b53aa56
AK		 428static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
429{
430 if (!vcpu->vmcs)
431 return;
432
433 vcpu_load(vcpu);
434 kvm_mmu_unload(vcpu);
435 vcpu_put(vcpu);
436}
437
6aa8b732
AK		 438static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
439{
bccf2150 440 if (!vcpu->vmcs)
1e8ba6fb
IM		 441 return;
442
bccf2150 443 vcpu_load(vcpu);
6aa8b732 444 kvm_mmu_destroy(vcpu);
08438475 445 vcpu_put(vcpu);
9ede74e0 446 kvm_arch_ops->vcpu_free(vcpu);
9a2bb7f4
AK		 447 free_page((unsigned long)vcpu->run);
448 vcpu->run = NULL;
039576c0
AK		 449 free_page((unsigned long)vcpu->pio_data);
450 vcpu->pio_data = NULL;
451 free_pio_guest_pages(vcpu);
6aa8b732
AK		 452}
453
454static void kvm_free_vcpus(struct kvm *kvm)
455{
456 unsigned int i;
457
7b53aa56
AK		 458 /*
459 * Unpin any mmu pages first.
460 */
461 for (i = 0; i < KVM_MAX_VCPUS; ++i)
462 kvm_unload_vcpu_mmu(&kvm->vcpus[i]);
6aa8b732
AK		 463 for (i = 0; i < KVM_MAX_VCPUS; ++i)
464 kvm_free_vcpu(&kvm->vcpus[i]);
465}
466
467static int kvm_dev_release(struct inode *inode, struct file *filp)
468{
f17abe9a
AK		 469 return 0;
470}
6aa8b732 471
f17abe9a
AK		 472static void kvm_destroy_vm(struct kvm *kvm)
473{
133de902
AK		 474 spin_lock(&kvm_lock);
475 list_del(&kvm->vm_list);
476 spin_unlock(&kvm_lock);
6aa8b732
AK		 477 kvm_free_vcpus(kvm);
478 kvm_free_physmem(kvm);
479 kfree(kvm);
f17abe9a
AK		 480}
481
482static int kvm_vm_release(struct inode *inode, struct file *filp)
483{
484 struct kvm *kvm = filp->private_data;
485
486 kvm_destroy_vm(kvm);
6aa8b732
AK		 487 return 0;
488}
489
490static void inject_gp(struct kvm_vcpu *vcpu)
491{
492 kvm_arch_ops->inject_gp(vcpu, 0);
493}
494
1342d353
AK		 495/*
496 * Load the pae pdptrs. Return true is they are all valid.
497 */
498static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
6aa8b732
AK		 499{
500 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
1342d353 501 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
6aa8b732
AK		 502 int i;
503 u64 pdpte;
504 u64 *pdpt;
1342d353 505 int ret;
954bbbc2 506 struct page *page;
6aa8b732
AK		 507
508 spin_lock(&vcpu->kvm->lock);
954bbbc2
AK		 509 page = gfn_to_page(vcpu->kvm, pdpt_gfn);
510 /* FIXME: !page - emulate? 0xff? */
511 pdpt = kmap_atomic(page, KM_USER0);
6aa8b732 512
1342d353 513 ret = 1;
6aa8b732
AK		 514 for (i = 0; i < 4; ++i) {
515 pdpte = pdpt[offset + i];
1342d353
AK		 516 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
517 ret = 0;
518 goto out;
519 }
6aa8b732
AK		 520 }
521
1342d353
AK		 522 for (i = 0; i < 4; ++i)
523 vcpu->pdptrs[i] = pdpt[offset + i];
524
525out:
6aa8b732
AK		 526 kunmap_atomic(pdpt, KM_USER0);
527 spin_unlock(&vcpu->kvm->lock);
528
1342d353 529 return ret;
6aa8b732
AK		 530}
531
532void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
533{
534 if (cr0 & CR0_RESEVED_BITS) {
535 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
536 cr0, vcpu->cr0);
537 inject_gp(vcpu);
538 return;
539 }
540
541 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
542 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
543 inject_gp(vcpu);
544 return;
545 }
546
547 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
548 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
549 "and a clear PE flag\n");
550 inject_gp(vcpu);
551 return;
552 }
553
554 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 555#ifdef CONFIG_X86_64
6aa8b732
AK		 556 if ((vcpu->shadow_efer & EFER_LME)) {
557 int cs_db, cs_l;
558
559 if (!is_pae(vcpu)) {
560 printk(KERN_DEBUG "set_cr0: #GP, start paging "
561 "in long mode while PAE is disabled\n");
562 inject_gp(vcpu);
563 return;
564 }
565 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
566 if (cs_l) {
567 printk(KERN_DEBUG "set_cr0: #GP, start paging "
568 "in long mode while CS.L == 1\n");
569 inject_gp(vcpu);
570 return;
571
572 }
573 } else
574#endif
1342d353 575 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 576 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
577 "reserved bits\n");
578 inject_gp(vcpu);
579 return;
580 }
581
582 }
583
584 kvm_arch_ops->set_cr0(vcpu, cr0);
585 vcpu->cr0 = cr0;
586
587 spin_lock(&vcpu->kvm->lock);
588 kvm_mmu_reset_context(vcpu);
589 spin_unlock(&vcpu->kvm->lock);
590 return;
591}
592EXPORT_SYMBOL_GPL(set_cr0);
593
594void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
595{
596 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
597}
598EXPORT_SYMBOL_GPL(lmsw);
599
600void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
601{
602 if (cr4 & CR4_RESEVED_BITS) {
603 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
604 inject_gp(vcpu);
605 return;
606 }
607
a9058ecd 608 if (is_long_mode(vcpu)) {
6aa8b732
AK		 609 if (!(cr4 & CR4_PAE_MASK)) {
610 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
611 "in long mode\n");
612 inject_gp(vcpu);
613 return;
614 }
615 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
1342d353 616 && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 617 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
618 inject_gp(vcpu);
619 }
620
621 if (cr4 & CR4_VMXE_MASK) {
622 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
623 inject_gp(vcpu);
624 return;
625 }
626 kvm_arch_ops->set_cr4(vcpu, cr4);
627 spin_lock(&vcpu->kvm->lock);
628 kvm_mmu_reset_context(vcpu);
629 spin_unlock(&vcpu->kvm->lock);
630}
631EXPORT_SYMBOL_GPL(set_cr4);
632
633void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
634{
a9058ecd 635 if (is_long_mode(vcpu)) {
d27d4aca 636 if (cr3 & CR3_L_MODE_RESEVED_BITS) {
6aa8b732
AK		 637 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
638 inject_gp(vcpu);
639 return;
640 }
641 } else {
642 if (cr3 & CR3_RESEVED_BITS) {
643 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
644 inject_gp(vcpu);
645 return;
646 }
647 if (is_paging(vcpu) && is_pae(vcpu) &&
1342d353 648 !load_pdptrs(vcpu, cr3)) {
6aa8b732
AK		 649 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
650 "reserved bits\n");
651 inject_gp(vcpu);
652 return;
653 }
654 }
655
656 vcpu->cr3 = cr3;
657 spin_lock(&vcpu->kvm->lock);
d21225ee
IM		 658 /*
659 * Does the new cr3 value map to physical memory? (Note, we
660 * catch an invalid cr3 even in real-mode, because it would
661 * cause trouble later on when we turn on paging anyway.)
662 *
663 * A real CPU would silently accept an invalid cr3 and would
664 * attempt to use it - with largely undefined (and often hard
665 * to debug) behavior on the guest side.
666 */
667 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
668 inject_gp(vcpu);
669 else
670 vcpu->mmu.new_cr3(vcpu);
6aa8b732
AK		 671 spin_unlock(&vcpu->kvm->lock);
672}
673EXPORT_SYMBOL_GPL(set_cr3);
674
675void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
676{
677 if ( cr8 & CR8_RESEVED_BITS) {
678 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
679 inject_gp(vcpu);
680 return;
681 }
682 vcpu->cr8 = cr8;
683}
684EXPORT_SYMBOL_GPL(set_cr8);
685
686void fx_init(struct kvm_vcpu *vcpu)
687{
688 struct __attribute__ ((__packed__)) fx_image_s {
689 u16 control; //fcw
690 u16 status; //fsw
691 u16 tag; // ftw
692 u16 opcode; //fop
693 u64 ip; // fpu ip
694 u64 operand;// fpu dp
695 u32 mxcsr;
696 u32 mxcsr_mask;
697
698 } *fx_image;
699
700 fx_save(vcpu->host_fx_image);
701 fpu_init();
702 fx_save(vcpu->guest_fx_image);
703 fx_restore(vcpu->host_fx_image);
704
705 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
706 fx_image->mxcsr = 0x1f80;
707 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
708 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
709}
710EXPORT_SYMBOL_GPL(fx_init);
711
02b27c1f
UL		 712static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
713{
714 spin_lock(&vcpu->kvm->lock);
715 kvm_mmu_slot_remove_write_access(vcpu, slot);
716 spin_unlock(&vcpu->kvm->lock);
717}
718
6aa8b732
AK		 719/*
720 * Allocate some memory and give it an address in the guest physical address
721 * space.
722 *
723 * Discontiguous memory is allowed, mostly for framebuffers.
724 */
2c6f5df9
AK		 725static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
726 struct kvm_memory_region *mem)
6aa8b732
AK		 727{
728 int r;
729 gfn_t base_gfn;
730 unsigned long npages;
731 unsigned long i;
732 struct kvm_memory_slot *memslot;
733 struct kvm_memory_slot old, new;
734 int memory_config_version;
735
736 r = -EINVAL;
737 /* General sanity checks */
738 if (mem->memory_size & (PAGE_SIZE - 1))
739 goto out;
740 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
741 goto out;
742 if (mem->slot >= KVM_MEMORY_SLOTS)
743 goto out;
744 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
745 goto out;
746
747 memslot = &kvm->memslots[mem->slot];
748 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
749 npages = mem->memory_size >> PAGE_SHIFT;
750
751 if (!npages)
752 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
753
754raced:
755 spin_lock(&kvm->lock);
756
757 memory_config_version = kvm->memory_config_version;
758 new = old = *memslot;
759
760 new.base_gfn = base_gfn;
761 new.npages = npages;
762 new.flags = mem->flags;
763
764 /* Disallow changing a memory slot's size. */
765 r = -EINVAL;
766 if (npages && old.npages && npages != old.npages)
767 goto out_unlock;
768
769 /* Check for overlaps */
770 r = -EEXIST;
771 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
772 struct kvm_memory_slot *s = &kvm->memslots[i];
773
774 if (s == memslot)
775 continue;
776 if (!((base_gfn + npages <= s->base_gfn) ||
777 (base_gfn >= s->base_gfn + s->npages)))
778 goto out_unlock;
779 }
780 /*
781 * Do memory allocations outside lock. memory_config_version will
782 * detect any races.
783 */
784 spin_unlock(&kvm->lock);
785
786 /* Deallocate if slot is being removed */
787 if (!npages)
8b6d44c7 788 new.phys_mem = NULL;
6aa8b732
AK		 789
790 /* Free page dirty bitmap if unneeded */
791 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
8b6d44c7 792 new.dirty_bitmap = NULL;
6aa8b732
AK		 793
794 r = -ENOMEM;
795
796 /* Allocate if a slot is being created */
797 if (npages && !new.phys_mem) {
798 new.phys_mem = vmalloc(npages * sizeof(struct page *));
799
800 if (!new.phys_mem)
801 goto out_free;
802
803 memset(new.phys_mem, 0, npages * sizeof(struct page *));
804 for (i = 0; i < npages; ++i) {
805 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
806 | __GFP_ZERO);
807 if (!new.phys_mem[i])
808 goto out_free;
5972e953 809 set_page_private(new.phys_mem[i],0);
6aa8b732
AK		 810 }
811 }
812
813 /* Allocate page dirty bitmap if needed */
814 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
815 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
816
817 new.dirty_bitmap = vmalloc(dirty_bytes);
818 if (!new.dirty_bitmap)
819 goto out_free;
820 memset(new.dirty_bitmap, 0, dirty_bytes);
821 }
822
823 spin_lock(&kvm->lock);
824
825 if (memory_config_version != kvm->memory_config_version) {
826 spin_unlock(&kvm->lock);
827 kvm_free_physmem_slot(&new, &old);
828 goto raced;
829 }
830
831 r = -EAGAIN;
832 if (kvm->busy)
833 goto out_unlock;
834
835 if (mem->slot >= kvm->nmemslots)
836 kvm->nmemslots = mem->slot + 1;
837
838 *memslot = new;
839 ++kvm->memory_config_version;
840
841 spin_unlock(&kvm->lock);
842
843 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
844 struct kvm_vcpu *vcpu;
845
bccf2150 846 vcpu = vcpu_load_slot(kvm, i);
6aa8b732
AK		 847 if (!vcpu)
848 continue;
ff990d59
UL		 849 if (new.flags & KVM_MEM_LOG_DIRTY_PAGES)
850 do_remove_write_access(vcpu, mem->slot);
6aa8b732
AK		 851 kvm_mmu_reset_context(vcpu);
852 vcpu_put(vcpu);
853 }
854
855 kvm_free_physmem_slot(&old, &new);
856 return 0;
857
858out_unlock:
859 spin_unlock(&kvm->lock);
860out_free:
861 kvm_free_physmem_slot(&new, &old);
862out:
863 return r;
864}
865
866/*
867 * Get (and clear) the dirty memory log for a memory slot.
868 */
2c6f5df9
AK		 869static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
870 struct kvm_dirty_log *log)
6aa8b732
AK		 871{
872 struct kvm_memory_slot *memslot;
873 int r, i;
874 int n;
714b93da 875 int cleared;
6aa8b732
AK		 876 unsigned long any = 0;
877
878 spin_lock(&kvm->lock);
879
880 /*
881 * Prevent changes to guest memory configuration even while the lock
882 * is not taken.
883 */
884 ++kvm->busy;
885 spin_unlock(&kvm->lock);
886 r = -EINVAL;
887 if (log->slot >= KVM_MEMORY_SLOTS)
888 goto out;
889
890 memslot = &kvm->memslots[log->slot];
891 r = -ENOENT;
892 if (!memslot->dirty_bitmap)
893 goto out;
894
cd1a4a98 895 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
6aa8b732 896
cd1a4a98 897 for (i = 0; !any && i < n/sizeof(long); ++i)
6aa8b732
AK		 898 any = memslot->dirty_bitmap[i];
899
900 r = -EFAULT;
901 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
902 goto out;
903
6aa8b732 904 if (any) {
714b93da 905 cleared = 0;
6aa8b732 906 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
bccf2150 907 struct kvm_vcpu *vcpu;
6aa8b732 908
bccf2150 909 vcpu = vcpu_load_slot(kvm, i);
6aa8b732
AK		 910 if (!vcpu)
911 continue;
714b93da
AK		 912 if (!cleared) {
913 do_remove_write_access(vcpu, log->slot);
914 memset(memslot->dirty_bitmap, 0, n);
915 cleared = 1;
916 }
6aa8b732
AK		 917 kvm_arch_ops->tlb_flush(vcpu);
918 vcpu_put(vcpu);
919 }
920 }
921
922 r = 0;
923
924out:
925 spin_lock(&kvm->lock);
926 --kvm->busy;
927 spin_unlock(&kvm->lock);
928 return r;
929}
930
e8207547
AK		 931/*
932 * Set a new alias region. Aliases map a portion of physical memory into
933 * another portion. This is useful for memory windows, for example the PC
934 * VGA region.
935 */
936static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
937 struct kvm_memory_alias *alias)
938{
939 int r, n;
940 struct kvm_mem_alias *p;
941
942 r = -EINVAL;
943 /* General sanity checks */
944 if (alias->memory_size & (PAGE_SIZE - 1))
945 goto out;
946 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
947 goto out;
948 if (alias->slot >= KVM_ALIAS_SLOTS)
949 goto out;
950 if (alias->guest_phys_addr + alias->memory_size
951 < alias->guest_phys_addr)
952 goto out;
953 if (alias->target_phys_addr + alias->memory_size
954 < alias->target_phys_addr)
955 goto out;
956
957 spin_lock(&kvm->lock);
958
959 p = &kvm->aliases[alias->slot];
960 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
961 p->npages = alias->memory_size >> PAGE_SHIFT;
962 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
963
964 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
965 if (kvm->aliases[n - 1].npages)
966 break;
967 kvm->naliases = n;
968
969 spin_unlock(&kvm->lock);
970
971 vcpu_load(&kvm->vcpus[0]);
972 spin_lock(&kvm->lock);
973 kvm_mmu_zap_all(&kvm->vcpus[0]);
974 spin_unlock(&kvm->lock);
975 vcpu_put(&kvm->vcpus[0]);
976
977 return 0;
978
979out:
980 return r;
981}
982
983static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
984{
985 int i;
986 struct kvm_mem_alias *alias;
987
988 for (i = 0; i < kvm->naliases; ++i) {
989 alias = &kvm->aliases[i];
990 if (gfn >= alias->base_gfn
991 && gfn < alias->base_gfn + alias->npages)
992 return alias->target_gfn + gfn - alias->base_gfn;
993 }
994 return gfn;
995}
996
997static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
6aa8b732
AK		 998{
999 int i;
1000
1001 for (i = 0; i < kvm->nmemslots; ++i) {
1002 struct kvm_memory_slot *memslot = &kvm->memslots[i];
1003
1004 if (gfn >= memslot->base_gfn
1005 && gfn < memslot->base_gfn + memslot->npages)
1006 return memslot;
1007 }
8b6d44c7 1008 return NULL;
6aa8b732 1009}
e8207547
AK		 1010
1011struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1012{
1013 gfn = unalias_gfn(kvm, gfn);
1014 return __gfn_to_memslot(kvm, gfn);
1015}
6aa8b732 1016
954bbbc2
AK		 1017struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1018{
1019 struct kvm_memory_slot *slot;
1020
e8207547
AK		 1021 gfn = unalias_gfn(kvm, gfn);
1022 slot = __gfn_to_memslot(kvm, gfn);
954bbbc2
AK		 1023 if (!slot)
1024 return NULL;
1025 return slot->phys_mem[gfn - slot->base_gfn];
1026}
1027EXPORT_SYMBOL_GPL(gfn_to_page);
1028
6aa8b732
AK		 1029void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1030{
1031 int i;
31389947 1032 struct kvm_memory_slot *memslot;
6aa8b732
AK		 1033 unsigned long rel_gfn;
1034
1035 for (i = 0; i < kvm->nmemslots; ++i) {
1036 memslot = &kvm->memslots[i];
1037
1038 if (gfn >= memslot->base_gfn
1039 && gfn < memslot->base_gfn + memslot->npages) {
1040
31389947 1041 if (!memslot->dirty_bitmap)
6aa8b732
AK		 1042 return;
1043
1044 rel_gfn = gfn - memslot->base_gfn;
1045
1046 /* avoid RMW */
1047 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
1048 set_bit(rel_gfn, memslot->dirty_bitmap);
1049 return;
1050 }
1051 }
1052}
1053
1054static int emulator_read_std(unsigned long addr,
4c690a1e 1055 void *val,
6aa8b732
AK		 1056 unsigned int bytes,
1057 struct x86_emulate_ctxt *ctxt)
1058{
1059 struct kvm_vcpu *vcpu = ctxt->vcpu;
1060 void *data = val;
1061
1062 while (bytes) {
1063 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1064 unsigned offset = addr & (PAGE_SIZE-1);
1065 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1066 unsigned long pfn;
954bbbc2
AK		 1067 struct page *page;
1068 void *page_virt;
6aa8b732
AK		 1069
1070 if (gpa == UNMAPPED_GVA)
1071 return X86EMUL_PROPAGATE_FAULT;
1072 pfn = gpa >> PAGE_SHIFT;
954bbbc2
AK		 1073 page = gfn_to_page(vcpu->kvm, pfn);
1074 if (!page)
6aa8b732 1075 return X86EMUL_UNHANDLEABLE;
954bbbc2 1076 page_virt = kmap_atomic(page, KM_USER0);
6aa8b732 1077
954bbbc2 1078 memcpy(data, page_virt + offset, tocopy);
6aa8b732 1079
954bbbc2 1080 kunmap_atomic(page_virt, KM_USER0);
6aa8b732
AK		 1081
1082 bytes -= tocopy;
1083 data += tocopy;
1084 addr += tocopy;
1085 }
1086
1087 return X86EMUL_CONTINUE;
1088}
1089
1090static int emulator_write_std(unsigned long addr,
4c690a1e 1091 const void *val,
6aa8b732
AK		 1092 unsigned int bytes,
1093 struct x86_emulate_ctxt *ctxt)
1094{
1095 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
1096 addr, bytes);
1097 return X86EMUL_UNHANDLEABLE;
1098}
1099
1100static int emulator_read_emulated(unsigned long addr,
4c690a1e 1101 void *val,
6aa8b732
AK		 1102 unsigned int bytes,
1103 struct x86_emulate_ctxt *ctxt)
1104{
1105 struct kvm_vcpu *vcpu = ctxt->vcpu;
1106
1107 if (vcpu->mmio_read_completed) {
1108 memcpy(val, vcpu->mmio_data, bytes);
1109 vcpu->mmio_read_completed = 0;
1110 return X86EMUL_CONTINUE;
1111 } else if (emulator_read_std(addr, val, bytes, ctxt)
1112 == X86EMUL_CONTINUE)
1113 return X86EMUL_CONTINUE;
1114 else {
1115 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
d27d4aca 1116
6aa8b732 1117 if (gpa == UNMAPPED_GVA)
d27d4aca 1118 return X86EMUL_PROPAGATE_FAULT;
6aa8b732
AK		 1119 vcpu->mmio_needed = 1;
1120 vcpu->mmio_phys_addr = gpa;
1121 vcpu->mmio_size = bytes;
1122 vcpu->mmio_is_write = 0;
1123
1124 return X86EMUL_UNHANDLEABLE;
1125 }
1126}
1127
da4a00f0 1128static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
4c690a1e 1129 const void *val, int bytes)
da4a00f0 1130{
da4a00f0
AK		 1131 struct page *page;
1132 void *virt;
09072daf 1133 unsigned offset = offset_in_page(gpa);
da4a00f0
AK		 1134
1135 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
1136 return 0;
954bbbc2
AK		 1137 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1138 if (!page)
da4a00f0 1139 return 0;
ab51a434 1140 mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
da4a00f0 1141 virt = kmap_atomic(page, KM_USER0);
09072daf 1142 kvm_mmu_pte_write(vcpu, gpa, virt + offset, val, bytes);
4c690a1e 1143 memcpy(virt + offset_in_page(gpa), val, bytes);
da4a00f0 1144 kunmap_atomic(virt, KM_USER0);
da4a00f0
AK		 1145 return 1;
1146}
1147
6aa8b732 1148static int emulator_write_emulated(unsigned long addr,
4c690a1e 1149 const void *val,
6aa8b732
AK		 1150 unsigned int bytes,
1151 struct x86_emulate_ctxt *ctxt)
1152{
1153 struct kvm_vcpu *vcpu = ctxt->vcpu;
1154 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1155
c9047f53
AK		 1156 if (gpa == UNMAPPED_GVA) {
1157 kvm_arch_ops->inject_page_fault(vcpu, addr, 2);
6aa8b732 1158 return X86EMUL_PROPAGATE_FAULT;
c9047f53 1159 }
6aa8b732 1160
da4a00f0
AK		 1161 if (emulator_write_phys(vcpu, gpa, val, bytes))
1162 return X86EMUL_CONTINUE;
1163
6aa8b732
AK		 1164 vcpu->mmio_needed = 1;
1165 vcpu->mmio_phys_addr = gpa;
1166 vcpu->mmio_size = bytes;
1167 vcpu->mmio_is_write = 1;
4c690a1e 1168 memcpy(vcpu->mmio_data, val, bytes);
6aa8b732
AK		 1169
1170 return X86EMUL_CONTINUE;
1171}
1172
1173static int emulator_cmpxchg_emulated(unsigned long addr,
4c690a1e
AK		 1174 const void *old,
1175 const void *new,
6aa8b732
AK		 1176 unsigned int bytes,
1177 struct x86_emulate_ctxt *ctxt)
1178{
1179 static int reported;
1180
1181 if (!reported) {
1182 reported = 1;
1183 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1184 }
1185 return emulator_write_emulated(addr, new, bytes, ctxt);
1186}
1187
1188static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1189{
1190 return kvm_arch_ops->get_segment_base(vcpu, seg);
1191}
1192
1193int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1194{
6aa8b732
AK		 1195 return X86EMUL_CONTINUE;
1196}
1197
1198int emulate_clts(struct kvm_vcpu *vcpu)
1199{
399badf3 1200 unsigned long cr0;
6aa8b732 1201
399badf3 1202 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
6aa8b732
AK		 1203 kvm_arch_ops->set_cr0(vcpu, cr0);
1204 return X86EMUL_CONTINUE;
1205}
1206
1207int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1208{
1209 struct kvm_vcpu *vcpu = ctxt->vcpu;
1210
1211 switch (dr) {
1212 case 0 ... 3:
1213 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1214 return X86EMUL_CONTINUE;
1215 default:
1216 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1217 __FUNCTION__, dr);
1218 return X86EMUL_UNHANDLEABLE;
1219 }
1220}
1221
1222int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1223{
1224 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1225 int exception;
1226
1227 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1228 if (exception) {
1229 /* FIXME: better handling */
1230 return X86EMUL_UNHANDLEABLE;
1231 }
1232 return X86EMUL_CONTINUE;
1233}
1234
1235static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1236{
1237 static int reported;
1238 u8 opcodes[4];
1239 unsigned long rip = ctxt->vcpu->rip;
1240 unsigned long rip_linear;
1241
1242 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1243
1244 if (reported)
1245 return;
1246
1247 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1248
1249 printk(KERN_ERR "emulation failed but !mmio_needed?"
1250 " rip %lx %02x %02x %02x %02x\n",
1251 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1252 reported = 1;
1253}
1254
1255struct x86_emulate_ops emulate_ops = {
1256 .read_std = emulator_read_std,
1257 .write_std = emulator_write_std,
1258 .read_emulated = emulator_read_emulated,
1259 .write_emulated = emulator_write_emulated,
1260 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1261};
1262
1263int emulate_instruction(struct kvm_vcpu *vcpu,
1264 struct kvm_run *run,
1265 unsigned long cr2,
1266 u16 error_code)
1267{
1268 struct x86_emulate_ctxt emulate_ctxt;
1269 int r;
1270 int cs_db, cs_l;
1271
e7df56e4 1272 vcpu->mmio_fault_cr2 = cr2;
6aa8b732
AK		 1273 kvm_arch_ops->cache_regs(vcpu);
1274
1275 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1276
1277 emulate_ctxt.vcpu = vcpu;
1278 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1279 emulate_ctxt.cr2 = cr2;
1280 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1281 ? X86EMUL_MODE_REAL : cs_l
1282 ? X86EMUL_MODE_PROT64 : cs_db
1283 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1284
1285 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1286 emulate_ctxt.cs_base = 0;
1287 emulate_ctxt.ds_base = 0;
1288 emulate_ctxt.es_base = 0;
1289 emulate_ctxt.ss_base = 0;
1290 } else {
1291 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1292 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1293 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1294 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1295 }
1296
1297 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1298 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1299
1300 vcpu->mmio_is_write = 0;
1301 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1302
1303 if ((r || vcpu->mmio_is_write) && run) {
1304 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1305 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1306 run->mmio.len = vcpu->mmio_size;
1307 run->mmio.is_write = vcpu->mmio_is_write;
1308 }
1309
1310 if (r) {
a436036b
AK		 1311 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1312 return EMULATE_DONE;
6aa8b732
AK		 1313 if (!vcpu->mmio_needed) {
1314 report_emulation_failure(&emulate_ctxt);
1315 return EMULATE_FAIL;
1316 }
1317 return EMULATE_DO_MMIO;
1318 }
1319
1320 kvm_arch_ops->decache_regs(vcpu);
1321 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1322
02c83209
AK		 1323 if (vcpu->mmio_is_write) {
1324 vcpu->mmio_needed = 0;
6aa8b732 1325 return EMULATE_DO_MMIO;
02c83209 1326 }
6aa8b732
AK		 1327
1328 return EMULATE_DONE;
1329}
1330EXPORT_SYMBOL_GPL(emulate_instruction);
1331
d3bef15f
AK		 1332int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1333{
1334 if (vcpu->irq_summary)
1335 return 1;
1336
1337 vcpu->run->exit_reason = KVM_EXIT_HLT;
1338 ++vcpu->stat.halt_exits;
1339 return 0;
1340}
1341EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1342
270fd9b9
AK		 1343int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1344{
1345 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1346
9b22bf57 1347 kvm_arch_ops->cache_regs(vcpu);
270fd9b9
AK		 1348 ret = -KVM_EINVAL;
1349#ifdef CONFIG_X86_64
1350 if (is_long_mode(vcpu)) {
1351 nr = vcpu->regs[VCPU_REGS_RAX];
1352 a0 = vcpu->regs[VCPU_REGS_RDI];
1353 a1 = vcpu->regs[VCPU_REGS_RSI];
1354 a2 = vcpu->regs[VCPU_REGS_RDX];
1355 a3 = vcpu->regs[VCPU_REGS_RCX];
1356 a4 = vcpu->regs[VCPU_REGS_R8];
1357 a5 = vcpu->regs[VCPU_REGS_R9];
1358 } else
1359#endif
1360 {
1361 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1362 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1363 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1364 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1365 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1366 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1367 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1368 }
1369 switch (nr) {
1370 default:
b4e63f56
AK		 1371 run->hypercall.args[0] = a0;
1372 run->hypercall.args[1] = a1;
1373 run->hypercall.args[2] = a2;
1374 run->hypercall.args[3] = a3;
1375 run->hypercall.args[4] = a4;
1376 run->hypercall.args[5] = a5;
1377 run->hypercall.ret = ret;
1378 run->hypercall.longmode = is_long_mode(vcpu);
1379 kvm_arch_ops->decache_regs(vcpu);
1380 return 0;
270fd9b9
AK		 1381 }
1382 vcpu->regs[VCPU_REGS_RAX] = ret;
9b22bf57 1383 kvm_arch_ops->decache_regs(vcpu);
270fd9b9
AK		 1384 return 1;
1385}
1386EXPORT_SYMBOL_GPL(kvm_hypercall);
1387
6aa8b732
AK		 1388static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1389{
1390 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1391}
1392
1393void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1394{
1395 struct descriptor_table dt = { limit, base };
1396
1397 kvm_arch_ops->set_gdt(vcpu, &dt);
1398}
1399
1400void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1401{
1402 struct descriptor_table dt = { limit, base };
1403
1404 kvm_arch_ops->set_idt(vcpu, &dt);
1405}
1406
1407void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1408 unsigned long *rflags)
1409{
1410 lmsw(vcpu, msw);
1411 *rflags = kvm_arch_ops->get_rflags(vcpu);
1412}
1413
1414unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1415{
25c4c276 1416 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 1417 switch (cr) {
1418 case 0:
1419 return vcpu->cr0;
1420 case 2:
1421 return vcpu->cr2;
1422 case 3:
1423 return vcpu->cr3;
1424 case 4:
1425 return vcpu->cr4;
1426 default:
1427 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1428 return 0;
1429 }
1430}
1431
1432void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1433 unsigned long *rflags)
1434{
1435 switch (cr) {
1436 case 0:
1437 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1438 *rflags = kvm_arch_ops->get_rflags(vcpu);
1439 break;
1440 case 2:
1441 vcpu->cr2 = val;
1442 break;
1443 case 3:
1444 set_cr3(vcpu, val);
1445 break;
1446 case 4:
1447 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1448 break;
1449 default:
1450 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1451 }
1452}
1453
102d8325
IM		 1454/*
1455 * Register the para guest with the host:
1456 */
1457static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1458{
1459 struct kvm_vcpu_para_state *para_state;
1460 hpa_t para_state_hpa, hypercall_hpa;
1461 struct page *para_state_page;
1462 unsigned char *hypercall;
1463 gpa_t hypercall_gpa;
1464
1465 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1466 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1467
1468 /*
1469 * Needs to be page aligned:
1470 */
1471 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1472 goto err_gp;
1473
1474 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1475 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1476 if (is_error_hpa(para_state_hpa))
1477 goto err_gp;
1478
ab51a434 1479 mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
102d8325
IM		 1480 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1481 para_state = kmap_atomic(para_state_page, KM_USER0);
1482
1483 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1484 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1485
1486 para_state->host_version = KVM_PARA_API_VERSION;
1487 /*
1488 * We cannot support guests that try to register themselves
1489 * with a newer API version than the host supports:
1490 */
1491 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1492 para_state->ret = -KVM_EINVAL;
1493 goto err_kunmap_skip;
1494 }
1495
1496 hypercall_gpa = para_state->hypercall_gpa;
1497 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1498 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1499 if (is_error_hpa(hypercall_hpa)) {
1500 para_state->ret = -KVM_EINVAL;
1501 goto err_kunmap_skip;
1502 }
1503
1504 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1505 vcpu->para_state_page = para_state_page;
1506 vcpu->para_state_gpa = para_state_gpa;
1507 vcpu->hypercall_gpa = hypercall_gpa;
1508
ab51a434 1509 mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
102d8325
IM		 1510 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1511 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1512 kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1513 kunmap_atomic(hypercall, KM_USER1);
1514
1515 para_state->ret = 0;
1516err_kunmap_skip:
1517 kunmap_atomic(para_state, KM_USER0);
1518 return 0;
1519err_gp:
1520 return 1;
1521}
1522
3bab1f5d
AK		 1523int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1524{
1525 u64 data;
1526
1527 switch (msr) {
1528 case 0xc0010010: /* SYSCFG */
1529 case 0xc0010015: /* HWCR */
1530 case MSR_IA32_PLATFORM_ID:
1531 case MSR_IA32_P5_MC_ADDR:
1532 case MSR_IA32_P5_MC_TYPE:
1533 case MSR_IA32_MC0_CTL:
1534 case MSR_IA32_MCG_STATUS:
1535 case MSR_IA32_MCG_CAP:
1536 case MSR_IA32_MC0_MISC:
1537 case MSR_IA32_MC0_MISC+4:
1538 case MSR_IA32_MC0_MISC+8:
1539 case MSR_IA32_MC0_MISC+12:
1540 case MSR_IA32_MC0_MISC+16:
1541 case MSR_IA32_UCODE_REV:
a8d13ea2 1542 case MSR_IA32_PERF_STATUS:
2dc7094b 1543 case MSR_IA32_EBL_CR_POWERON:
3bab1f5d
AK		 1544 /* MTRR registers */
1545 case 0xfe:
1546 case 0x200 ... 0x2ff:
1547 data = 0;
1548 break;
a8d13ea2
AK		 1549 case 0xcd: /* fsb frequency */
1550 data = 3;
1551 break;
3bab1f5d
AK		 1552 case MSR_IA32_APICBASE:
1553 data = vcpu->apic_base;
1554 break;
6f00e68f
AK		 1555 case MSR_IA32_MISC_ENABLE:
1556 data = vcpu->ia32_misc_enable_msr;
1557 break;
3bab1f5d
AK		 1558#ifdef CONFIG_X86_64
1559 case MSR_EFER:
1560 data = vcpu->shadow_efer;
1561 break;
1562#endif
1563 default:
1564 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1565 return 1;
1566 }
1567 *pdata = data;
1568 return 0;
1569}
1570EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1571
6aa8b732
AK		 1572/*
1573 * Reads an msr value (of 'msr_index') into 'pdata'.
1574 * Returns 0 on success, non-0 otherwise.
1575 * Assumes vcpu_load() was already called.
1576 */
1577static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1578{
1579 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1580}
1581
05b3e0c2 1582#ifdef CONFIG_X86_64
6aa8b732 1583
3bab1f5d 1584static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1585{
6aa8b732
AK		 1586 if (efer & EFER_RESERVED_BITS) {
1587 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1588 efer);
1589 inject_gp(vcpu);
1590 return;
1591 }
1592
1593 if (is_paging(vcpu)
1594 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1595 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1596 inject_gp(vcpu);
1597 return;
1598 }
1599
7725f0ba
AK		 1600 kvm_arch_ops->set_efer(vcpu, efer);
1601
6aa8b732
AK		 1602 efer &= ~EFER_LMA;
1603 efer |= vcpu->shadow_efer & EFER_LMA;
1604
1605 vcpu->shadow_efer = efer;
6aa8b732 1606}
6aa8b732
AK		 1607
1608#endif
1609
3bab1f5d
AK		 1610int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1611{
1612 switch (msr) {
1613#ifdef CONFIG_X86_64
1614 case MSR_EFER:
1615 set_efer(vcpu, data);
1616 break;
1617#endif
1618 case MSR_IA32_MC0_STATUS:
1619 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1620 __FUNCTION__, data);
1621 break;
0e5bf0d0
SK		 1622 case MSR_IA32_MCG_STATUS:
1623 printk(KERN_WARNING "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
1624 __FUNCTION__, data);
1625 break;
3bab1f5d
AK		 1626 case MSR_IA32_UCODE_REV:
1627 case MSR_IA32_UCODE_WRITE:
1628 case 0x200 ... 0x2ff: /* MTRRs */
1629 break;
1630 case MSR_IA32_APICBASE:
1631 vcpu->apic_base = data;
1632 break;
6f00e68f
AK		 1633 case MSR_IA32_MISC_ENABLE:
1634 vcpu->ia32_misc_enable_msr = data;
1635 break;
102d8325
IM		 1636 /*
1637 * This is the 'probe whether the host is KVM' logic:
1638 */
1639 case MSR_KVM_API_MAGIC:
1640 return vcpu_register_para(vcpu, data);
1641
3bab1f5d
AK		 1642 default:
1643 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1644 return 1;
1645 }
1646 return 0;
1647}
1648EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1649
6aa8b732
AK		 1650/*
1651 * Writes msr value into into the appropriate "register".
1652 * Returns 0 on success, non-0 otherwise.
1653 * Assumes vcpu_load() was already called.
1654 */
1655static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1656{
1657 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1658}
1659
1660void kvm_resched(struct kvm_vcpu *vcpu)
1661{
3fca0365
YD		 1662 if (!need_resched())
1663 return;
6aa8b732
AK		 1664 vcpu_put(vcpu);
1665 cond_resched();
bccf2150 1666 vcpu_load(vcpu);
6aa8b732
AK		 1667}
1668EXPORT_SYMBOL_GPL(kvm_resched);
1669
1670void load_msrs(struct vmx_msr_entry *e, int n)
1671{
1672 int i;
1673
1674 for (i = 0; i < n; ++i)
1675 wrmsrl(e[i].index, e[i].data);
1676}
1677EXPORT_SYMBOL_GPL(load_msrs);
1678
1679void save_msrs(struct vmx_msr_entry *e, int n)
1680{
1681 int i;
1682
1683 for (i = 0; i < n; ++i)
1684 rdmsrl(e[i].index, e[i].data);
1685}
1686EXPORT_SYMBOL_GPL(save_msrs);
1687
06465c5a
AK		 1688void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1689{
1690 int i;
1691 u32 function;
1692 struct kvm_cpuid_entry *e, *best;
1693
1694 kvm_arch_ops->cache_regs(vcpu);
1695 function = vcpu->regs[VCPU_REGS_RAX];
1696 vcpu->regs[VCPU_REGS_RAX] = 0;
1697 vcpu->regs[VCPU_REGS_RBX] = 0;
1698 vcpu->regs[VCPU_REGS_RCX] = 0;
1699 vcpu->regs[VCPU_REGS_RDX] = 0;
1700 best = NULL;
1701 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1702 e = &vcpu->cpuid_entries[i];
1703 if (e->function == function) {
1704 best = e;
1705 break;
1706 }
1707 /*
1708 * Both basic or both extended?
1709 */
1710 if (((e->function ^ function) & 0x80000000) == 0)
1711 if (!best || e->function > best->function)
1712 best = e;
1713 }
1714 if (best) {
1715 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1716 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1717 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1718 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1719 }
1720 kvm_arch_ops->decache_regs(vcpu);
1721 kvm_arch_ops->skip_emulated_instruction(vcpu);
1722}
1723EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1724
039576c0 1725static int pio_copy_data(struct kvm_vcpu *vcpu)
46fc1477 1726{
039576c0
AK		 1727 void *p = vcpu->pio_data;
1728 void *q;
1729 unsigned bytes;
1730 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1731
1732 kvm_arch_ops->vcpu_put(vcpu);
1733 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1734 PAGE_KERNEL);
1735 if (!q) {
1736 kvm_arch_ops->vcpu_load(vcpu);
1737 free_pio_guest_pages(vcpu);
1738 return -ENOMEM;
1739 }
1740 q += vcpu->pio.guest_page_offset;
1741 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1742 if (vcpu->pio.in)
1743 memcpy(q, p, bytes);
1744 else
1745 memcpy(p, q, bytes);
1746 q -= vcpu->pio.guest_page_offset;
1747 vunmap(q);
1748 kvm_arch_ops->vcpu_load(vcpu);
1749 free_pio_guest_pages(vcpu);
1750 return 0;
1751}
1752
1753static int complete_pio(struct kvm_vcpu *vcpu)
1754{
1755 struct kvm_pio_request *io = &vcpu->pio;
46fc1477 1756 long delta;
039576c0 1757 int r;
46fc1477
AK		 1758
1759 kvm_arch_ops->cache_regs(vcpu);
1760
1761 if (!io->string) {
039576c0
AK		 1762 if (io->in)
1763 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
46fc1477
AK		 1764 io->size);
1765 } else {
039576c0
AK		 1766 if (io->in) {
1767 r = pio_copy_data(vcpu);
1768 if (r) {
1769 kvm_arch_ops->cache_regs(vcpu);
1770 return r;
1771 }
1772 }
1773
46fc1477
AK		 1774 delta = 1;
1775 if (io->rep) {
039576c0 1776 delta *= io->cur_count;
46fc1477
AK		 1777 /*
1778 * The size of the register should really depend on
1779 * current address size.
1780 */
1781 vcpu->regs[VCPU_REGS_RCX] -= delta;
1782 }
039576c0 1783 if (io->down)
46fc1477
AK		 1784 delta = -delta;
1785 delta *= io->size;
039576c0 1786 if (io->in)
46fc1477
AK		 1787 vcpu->regs[VCPU_REGS_RDI] += delta;
1788 else
1789 vcpu->regs[VCPU_REGS_RSI] += delta;
1790 }
1791
46fc1477
AK		 1792 kvm_arch_ops->decache_regs(vcpu);
1793
039576c0
AK		 1794 io->count -= io->cur_count;
1795 io->cur_count = 0;
1796
1797 if (!io->count)
1798 kvm_arch_ops->skip_emulated_instruction(vcpu);
1799 return 0;
46fc1477
AK		 1800}
1801
039576c0
AK		 1802int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1803 int size, unsigned long count, int string, int down,
1804 gva_t address, int rep, unsigned port)
1805{
1806 unsigned now, in_page;
1807 int i;
1808 int nr_pages = 1;
1809 struct page *page;
1810
1811 vcpu->run->exit_reason = KVM_EXIT_IO;
1812 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1813 vcpu->run->io.size = size;
1814 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1815 vcpu->run->io.count = count;
1816 vcpu->run->io.port = port;
1817 vcpu->pio.count = count;
1818 vcpu->pio.cur_count = count;
1819 vcpu->pio.size = size;
1820 vcpu->pio.in = in;
1821 vcpu->pio.string = string;
1822 vcpu->pio.down = down;
1823 vcpu->pio.guest_page_offset = offset_in_page(address);
1824 vcpu->pio.rep = rep;
1825
1826 if (!string) {
1827 kvm_arch_ops->cache_regs(vcpu);
1828 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1829 kvm_arch_ops->decache_regs(vcpu);
1830 return 0;
1831 }
1832
1833 if (!count) {
1834 kvm_arch_ops->skip_emulated_instruction(vcpu);
1835 return 1;
1836 }
1837
1838 now = min(count, PAGE_SIZE / size);
1839
1840 if (!down)
1841 in_page = PAGE_SIZE - offset_in_page(address);
1842 else
1843 in_page = offset_in_page(address) + size;
1844 now = min(count, (unsigned long)in_page / size);
1845 if (!now) {
1846 /*
1847 * String I/O straddles page boundary. Pin two guest pages
1848 * so that we satisfy atomicity constraints. Do just one
1849 * transaction to avoid complexity.
1850 */
1851 nr_pages = 2;
1852 now = 1;
1853 }
1854 if (down) {
1855 /*
1856 * String I/O in reverse. Yuck. Kill the guest, fix later.
1857 */
1858 printk(KERN_ERR "kvm: guest string pio down\n");
1859 inject_gp(vcpu);
1860 return 1;
1861 }
1862 vcpu->run->io.count = now;
1863 vcpu->pio.cur_count = now;
1864
1865 for (i = 0; i < nr_pages; ++i) {
1866 spin_lock(&vcpu->kvm->lock);
1867 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1868 if (page)
1869 get_page(page);
1870 vcpu->pio.guest_pages[i] = page;
1871 spin_unlock(&vcpu->kvm->lock);
1872 if (!page) {
1873 inject_gp(vcpu);
1874 free_pio_guest_pages(vcpu);
1875 return 1;
1876 }
1877 }
1878
1879 if (!vcpu->pio.in)
1880 return pio_copy_data(vcpu);
1881 return 0;
1882}
1883EXPORT_SYMBOL_GPL(kvm_setup_pio);
1884
bccf2150 1885static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
6aa8b732 1886{
6aa8b732 1887 int r;
1961d276 1888 sigset_t sigsaved;
6aa8b732 1889
bccf2150 1890 vcpu_load(vcpu);
6aa8b732 1891
1961d276
AK		 1892 if (vcpu->sigset_active)
1893 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
1894
54810342
DL		 1895 /* re-sync apic's tpr */
1896 vcpu->cr8 = kvm_run->cr8;
1897
02c83209
AK		 1898 if (vcpu->pio.cur_count) {
1899 r = complete_pio(vcpu);
1900 if (r)
1901 goto out;
1902 }
1903
1904 if (vcpu->mmio_needed) {
1905 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1906 vcpu->mmio_read_completed = 1;
1907 vcpu->mmio_needed = 0;
1908 r = emulate_instruction(vcpu, kvm_run,
1909 vcpu->mmio_fault_cr2, 0);
1910 if (r == EMULATE_DO_MMIO) {
1911 /*
1912 * Read-modify-write. Back to userspace.
1913 */
1914 kvm_run->exit_reason = KVM_EXIT_MMIO;
1915 r = 0;
1916 goto out;
46fc1477 1917 }
6aa8b732
AK		 1918 }
1919
8eb7d334 1920 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
b4e63f56
AK		 1921 kvm_arch_ops->cache_regs(vcpu);
1922 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
1923 kvm_arch_ops->decache_regs(vcpu);
1924 }
1925
6aa8b732
AK		 1926 r = kvm_arch_ops->run(vcpu, kvm_run);
1927
039576c0 1928out:
1961d276
AK		 1929 if (vcpu->sigset_active)
1930 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1931
6aa8b732
AK		 1932 vcpu_put(vcpu);
1933 return r;
1934}
1935
bccf2150
AK		 1936static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
1937 struct kvm_regs *regs)
6aa8b732 1938{
bccf2150 1939 vcpu_load(vcpu);
6aa8b732
AK		 1940
1941 kvm_arch_ops->cache_regs(vcpu);
1942
1943 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1944 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1945 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1946 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1947 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1948 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1949 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1950 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1951#ifdef CONFIG_X86_64
6aa8b732
AK		 1952 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1953 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1954 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1955 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1956 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1957 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1958 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1959 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1960#endif
1961
1962 regs->rip = vcpu->rip;
1963 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1964
1965 /*
1966 * Don't leak debug flags in case they were set for guest debugging
1967 */
1968 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1969 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1970
1971 vcpu_put(vcpu);
1972
1973 return 0;
1974}
1975
bccf2150
AK		 1976static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
1977 struct kvm_regs *regs)
6aa8b732 1978{
bccf2150 1979 vcpu_load(vcpu);
6aa8b732
AK		 1980
1981 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1982 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1983 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1984 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1985 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1986 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1987 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1988 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1989#ifdef CONFIG_X86_64
6aa8b732
AK		 1990 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1991 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1992 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1993 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1994 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1995 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1996 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1997 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1998#endif
1999
2000 vcpu->rip = regs->rip;
2001 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
2002
2003 kvm_arch_ops->decache_regs(vcpu);
2004
2005 vcpu_put(vcpu);
2006
2007 return 0;
2008}
2009
2010static void get_segment(struct kvm_vcpu *vcpu,
2011 struct kvm_segment *var, int seg)
2012{
2013 return kvm_arch_ops->get_segment(vcpu, var, seg);
2014}
2015
bccf2150
AK		 2016static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2017 struct kvm_sregs *sregs)
6aa8b732 2018{
6aa8b732
AK		 2019 struct descriptor_table dt;
2020
bccf2150 2021 vcpu_load(vcpu);
6aa8b732
AK		 2022
2023 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2024 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2025 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2026 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2027 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2028 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2029
2030 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2031 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2032
2033 kvm_arch_ops->get_idt(vcpu, &dt);
2034 sregs->idt.limit = dt.limit;
2035 sregs->idt.base = dt.base;
2036 kvm_arch_ops->get_gdt(vcpu, &dt);
2037 sregs->gdt.limit = dt.limit;
2038 sregs->gdt.base = dt.base;
2039
25c4c276 2040 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 2041 sregs->cr0 = vcpu->cr0;
2042 sregs->cr2 = vcpu->cr2;
2043 sregs->cr3 = vcpu->cr3;
2044 sregs->cr4 = vcpu->cr4;
2045 sregs->cr8 = vcpu->cr8;
2046 sregs->efer = vcpu->shadow_efer;
2047 sregs->apic_base = vcpu->apic_base;
2048
2049 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2050 sizeof sregs->interrupt_bitmap);
2051
2052 vcpu_put(vcpu);
2053
2054 return 0;
2055}
2056
2057static void set_segment(struct kvm_vcpu *vcpu,
2058 struct kvm_segment *var, int seg)
2059{
2060 return kvm_arch_ops->set_segment(vcpu, var, seg);
2061}
2062
bccf2150
AK		 2063static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2064 struct kvm_sregs *sregs)
6aa8b732 2065{
6aa8b732
AK		 2066 int mmu_reset_needed = 0;
2067 int i;
2068 struct descriptor_table dt;
2069
bccf2150 2070 vcpu_load(vcpu);
6aa8b732 2071
6aa8b732
AK		 2072 dt.limit = sregs->idt.limit;
2073 dt.base = sregs->idt.base;
2074 kvm_arch_ops->set_idt(vcpu, &dt);
2075 dt.limit = sregs->gdt.limit;
2076 dt.base = sregs->gdt.base;
2077 kvm_arch_ops->set_gdt(vcpu, &dt);
2078
2079 vcpu->cr2 = sregs->cr2;
2080 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2081 vcpu->cr3 = sregs->cr3;
2082
2083 vcpu->cr8 = sregs->cr8;
2084
2085 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 2086#ifdef CONFIG_X86_64
6aa8b732
AK		 2087 kvm_arch_ops->set_efer(vcpu, sregs->efer);
2088#endif
2089 vcpu->apic_base = sregs->apic_base;
2090
25c4c276 2091 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
399badf3 2092
6aa8b732 2093 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
f6528b03 2094 kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
6aa8b732
AK		 2095
2096 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2097 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 2098 if (!is_long_mode(vcpu) && is_pae(vcpu))
2099 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 2100
2101 if (mmu_reset_needed)
2102 kvm_mmu_reset_context(vcpu);
2103
2104 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2105 sizeof vcpu->irq_pending);
2106 vcpu->irq_summary = 0;
2107 for (i = 0; i < NR_IRQ_WORDS; ++i)
2108 if (vcpu->irq_pending[i])
2109 __set_bit(i, &vcpu->irq_summary);
2110
024aa1c0
AK		 2111 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2112 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2113 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2114 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2115 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2116 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2117
2118 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2119 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2120
6aa8b732
AK		 2121 vcpu_put(vcpu);
2122
2123 return 0;
2124}
2125
2126/*
2127 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2128 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 2129 *
2130 * This list is modified at module load time to reflect the
2131 * capabilities of the host cpu.
6aa8b732
AK		 2132 */
2133static u32 msrs_to_save[] = {
2134 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2135 MSR_K6_STAR,
05b3e0c2 2136#ifdef CONFIG_X86_64
6aa8b732
AK		 2137 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2138#endif
2139 MSR_IA32_TIME_STAMP_COUNTER,
2140};
2141
bf591b24
MR		 2142static unsigned num_msrs_to_save;
2143
6f00e68f
AK		 2144static u32 emulated_msrs[] = {
2145 MSR_IA32_MISC_ENABLE,
2146};
2147
bf591b24
MR		 2148static __init void kvm_init_msr_list(void)
2149{
2150 u32 dummy[2];
2151 unsigned i, j;
2152
2153 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2154 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2155 continue;
2156 if (j < i)
2157 msrs_to_save[j] = msrs_to_save[i];
2158 j++;
2159 }
2160 num_msrs_to_save = j;
2161}
6aa8b732
AK		 2162
2163/*
2164 * Adapt set_msr() to msr_io()'s calling convention
2165 */
2166static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2167{
2168 return set_msr(vcpu, index, *data);
2169}
2170
2171/*
2172 * Read or write a bunch of msrs. All parameters are kernel addresses.
2173 *
2174 * @return number of msrs set successfully.
2175 */
bccf2150 2176static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
6aa8b732
AK		 2177 struct kvm_msr_entry *entries,
2178 int (*do_msr)(struct kvm_vcpu *vcpu,
2179 unsigned index, u64 *data))
2180{
6aa8b732
AK		 2181 int i;
2182
bccf2150 2183 vcpu_load(vcpu);
6aa8b732
AK		 2184
2185 for (i = 0; i < msrs->nmsrs; ++i)
2186 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2187 break;
2188
2189 vcpu_put(vcpu);
2190
2191 return i;
2192}
2193
2194/*
2195 * Read or write a bunch of msrs. Parameters are user addresses.
2196 *
2197 * @return number of msrs set successfully.
2198 */
bccf2150 2199static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
6aa8b732
AK		 2200 int (*do_msr)(struct kvm_vcpu *vcpu,
2201 unsigned index, u64 *data),
2202 int writeback)
2203{
2204 struct kvm_msrs msrs;
2205 struct kvm_msr_entry *entries;
2206 int r, n;
2207 unsigned size;
2208
2209 r = -EFAULT;
2210 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2211 goto out;
2212
2213 r = -E2BIG;
2214 if (msrs.nmsrs >= MAX_IO_MSRS)
2215 goto out;
2216
2217 r = -ENOMEM;
2218 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2219 entries = vmalloc(size);
2220 if (!entries)
2221 goto out;
2222
2223 r = -EFAULT;
2224 if (copy_from_user(entries, user_msrs->entries, size))
2225 goto out_free;
2226
bccf2150 2227 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
6aa8b732
AK		 2228 if (r < 0)
2229 goto out_free;
2230
2231 r = -EFAULT;
2232 if (writeback && copy_to_user(user_msrs->entries, entries, size))
2233 goto out_free;
2234
2235 r = n;
2236
2237out_free:
2238 vfree(entries);
2239out:
2240 return r;
2241}
2242
2243/*
2244 * Translate a guest virtual address to a guest physical address.
2245 */
bccf2150
AK		 2246static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2247 struct kvm_translation *tr)
6aa8b732
AK		 2248{
2249 unsigned long vaddr = tr->linear_address;
6aa8b732
AK		 2250 gpa_t gpa;
2251
bccf2150
AK		 2252 vcpu_load(vcpu);
2253 spin_lock(&vcpu->kvm->lock);
6aa8b732
AK		 2254 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2255 tr->physical_address = gpa;
2256 tr->valid = gpa != UNMAPPED_GVA;
2257 tr->writeable = 1;
2258 tr->usermode = 0;
bccf2150 2259 spin_unlock(&vcpu->kvm->lock);
6aa8b732
AK		 2260 vcpu_put(vcpu);
2261
2262 return 0;
2263}
2264
bccf2150
AK		 2265static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2266 struct kvm_interrupt *irq)
6aa8b732 2267{
6aa8b732
AK		 2268 if (irq->irq < 0 || irq->irq >= 256)
2269 return -EINVAL;
bccf2150 2270 vcpu_load(vcpu);
6aa8b732
AK		 2271
2272 set_bit(irq->irq, vcpu->irq_pending);
2273 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2274
2275 vcpu_put(vcpu);
2276
2277 return 0;
2278}
2279
bccf2150
AK		 2280static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2281 struct kvm_debug_guest *dbg)
6aa8b732 2282{
6aa8b732
AK		 2283 int r;
2284
bccf2150 2285 vcpu_load(vcpu);
6aa8b732
AK		 2286
2287 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
2288
2289 vcpu_put(vcpu);
2290
2291 return r;
2292}
2293
9a2bb7f4
AK		 2294static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2295 unsigned long address,
2296 int *type)
2297{
2298 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2299 unsigned long pgoff;
2300 struct page *page;
2301
2302 *type = VM_FAULT_MINOR;
2303 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
039576c0
AK		 2304 if (pgoff == 0)
2305 page = virt_to_page(vcpu->run);
2306 else if (pgoff == KVM_PIO_PAGE_OFFSET)
2307 page = virt_to_page(vcpu->pio_data);
2308 else
9a2bb7f4 2309 return NOPAGE_SIGBUS;
9a2bb7f4
AK		 2310 get_page(page);
2311 return page;
2312}
2313
2314static struct vm_operations_struct kvm_vcpu_vm_ops = {
2315 .nopage = kvm_vcpu_nopage,
2316};
2317
2318static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2319{
2320 vma->vm_ops = &kvm_vcpu_vm_ops;
2321 return 0;
2322}
2323
bccf2150
AK		 2324static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2325{
2326 struct kvm_vcpu *vcpu = filp->private_data;
2327
2328 fput(vcpu->kvm->filp);
2329 return 0;
2330}
2331
2332static struct file_operations kvm_vcpu_fops = {
2333 .release = kvm_vcpu_release,
2334 .unlocked_ioctl = kvm_vcpu_ioctl,
2335 .compat_ioctl = kvm_vcpu_ioctl,
9a2bb7f4 2336 .mmap = kvm_vcpu_mmap,
bccf2150
AK		 2337};
2338
2339/*
2340 * Allocates an inode for the vcpu.
2341 */
2342static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2343{
2344 int fd, r;
2345 struct inode *inode;
2346 struct file *file;
2347
2348 atomic_inc(&vcpu->kvm->filp->f_count);
2349 inode = kvmfs_inode(&kvm_vcpu_fops);
2350 if (IS_ERR(inode)) {
2351 r = PTR_ERR(inode);
2352 goto out1;
2353 }
2354
2355 file = kvmfs_file(inode, vcpu);
2356 if (IS_ERR(file)) {
2357 r = PTR_ERR(file);
2358 goto out2;
2359 }
2360
2361 r = get_unused_fd();
2362 if (r < 0)
2363 goto out3;
2364 fd = r;
2365 fd_install(fd, file);
2366
2367 return fd;
2368
2369out3:
2370 fput(file);
2371out2:
2372 iput(inode);
2373out1:
2374 fput(vcpu->kvm->filp);
2375 return r;
2376}
2377
c5ea7660
AK		 2378/*
2379 * Creates some virtual cpus. Good luck creating more than one.
2380 */
2381static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2382{
2383 int r;
2384 struct kvm_vcpu *vcpu;
9a2bb7f4 2385 struct page *page;
c5ea7660
AK		 2386
2387 r = -EINVAL;
2388 if (!valid_vcpu(n))
2389 goto out;
2390
2391 vcpu = &kvm->vcpus[n];
2392
2393 mutex_lock(&vcpu->mutex);
2394
2395 if (vcpu->vmcs) {
2396 mutex_unlock(&vcpu->mutex);
2397 return -EEXIST;
2398 }
2399
9a2bb7f4
AK		 2400 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2401 r = -ENOMEM;
2402 if (!page)
2403 goto out_unlock;
2404 vcpu->run = page_address(page);
2405
039576c0
AK		 2406 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2407 r = -ENOMEM;
2408 if (!page)
2409 goto out_free_run;
2410 vcpu->pio_data = page_address(page);
2411
c5ea7660
AK		 2412 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
2413 FX_IMAGE_ALIGN);
2414 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
d917a6b9 2415 vcpu->cr0 = 0x10;
c5ea7660
AK		 2416
2417 r = kvm_arch_ops->vcpu_create(vcpu);
2418 if (r < 0)
2419 goto out_free_vcpus;
2420
2421 r = kvm_mmu_create(vcpu);
2422 if (r < 0)
2423 goto out_free_vcpus;
2424
2425 kvm_arch_ops->vcpu_load(vcpu);
2426 r = kvm_mmu_setup(vcpu);
2427 if (r >= 0)
2428 r = kvm_arch_ops->vcpu_setup(vcpu);
2429 vcpu_put(vcpu);
2430
2431 if (r < 0)
2432 goto out_free_vcpus;
2433
bccf2150
AK		 2434 r = create_vcpu_fd(vcpu);
2435 if (r < 0)
2436 goto out_free_vcpus;
2437
39c3b86e
AK		 2438 spin_lock(&kvm_lock);
2439 if (n >= kvm->nvcpus)
2440 kvm->nvcpus = n + 1;
2441 spin_unlock(&kvm_lock);
2442
bccf2150 2443 return r;
c5ea7660
AK		 2444
2445out_free_vcpus:
2446 kvm_free_vcpu(vcpu);
039576c0
AK		 2447out_free_run:
2448 free_page((unsigned long)vcpu->run);
2449 vcpu->run = NULL;
9a2bb7f4 2450out_unlock:
c5ea7660
AK		 2451 mutex_unlock(&vcpu->mutex);
2452out:
2453 return r;
2454}
2455
2cc51560
ED		 2456static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2457{
2458 u64 efer;
2459 int i;
2460 struct kvm_cpuid_entry *e, *entry;
2461
2462 rdmsrl(MSR_EFER, efer);
2463 entry = NULL;
2464 for (i = 0; i < vcpu->cpuid_nent; ++i) {
2465 e = &vcpu->cpuid_entries[i];
2466 if (e->function == 0x80000001) {
2467 entry = e;
2468 break;
2469 }
2470 }
2471 if (entry && (entry->edx & EFER_NX) && !(efer & EFER_NX)) {
2472 entry->edx &= ~(1 << 20);
2473 printk(KERN_INFO ": guest NX capability removed\n");
2474 }
2475}
2476
06465c5a
AK		 2477static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2478 struct kvm_cpuid *cpuid,
2479 struct kvm_cpuid_entry __user *entries)
2480{
2481 int r;
2482
2483 r = -E2BIG;
2484 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2485 goto out;
2486 r = -EFAULT;
2487 if (copy_from_user(&vcpu->cpuid_entries, entries,
2488 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2489 goto out;
2490 vcpu->cpuid_nent = cpuid->nent;
2cc51560 2491 cpuid_fix_nx_cap(vcpu);
06465c5a
AK		 2492 return 0;
2493
2494out:
2495 return r;
2496}
2497
1961d276
AK		 2498static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2499{
2500 if (sigset) {
2501 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2502 vcpu->sigset_active = 1;
2503 vcpu->sigset = *sigset;
2504 } else
2505 vcpu->sigset_active = 0;
2506 return 0;
2507}
2508
b8836737
AK		 2509/*
2510 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2511 * we have asm/x86/processor.h
2512 */
2513struct fxsave {
2514 u16 cwd;
2515 u16 swd;
2516 u16 twd;
2517 u16 fop;
2518 u64 rip;
2519 u64 rdp;
2520 u32 mxcsr;
2521 u32 mxcsr_mask;
2522 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2523#ifdef CONFIG_X86_64
2524 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2525#else
2526 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2527#endif
2528};
2529
2530static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2531{
2532 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2533
2534 vcpu_load(vcpu);
2535
2536 memcpy(fpu->fpr, fxsave->st_space, 128);
2537 fpu->fcw = fxsave->cwd;
2538 fpu->fsw = fxsave->swd;
2539 fpu->ftwx = fxsave->twd;
2540 fpu->last_opcode = fxsave->fop;
2541 fpu->last_ip = fxsave->rip;
2542 fpu->last_dp = fxsave->rdp;
2543 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2544
2545 vcpu_put(vcpu);
2546
2547 return 0;
2548}
2549
2550static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2551{
2552 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2553
2554 vcpu_load(vcpu);
2555
2556 memcpy(fxsave->st_space, fpu->fpr, 128);
2557 fxsave->cwd = fpu->fcw;
2558 fxsave->swd = fpu->fsw;
2559 fxsave->twd = fpu->ftwx;
2560 fxsave->fop = fpu->last_opcode;
2561 fxsave->rip = fpu->last_ip;
2562 fxsave->rdp = fpu->last_dp;
2563 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2564
2565 vcpu_put(vcpu);
2566
2567 return 0;
2568}
2569
bccf2150
AK		 2570static long kvm_vcpu_ioctl(struct file *filp,
2571 unsigned int ioctl, unsigned long arg)
6aa8b732 2572{
bccf2150 2573 struct kvm_vcpu *vcpu = filp->private_data;
2f366987 2574 void __user *argp = (void __user *)arg;
6aa8b732
AK		 2575 int r = -EINVAL;
2576
2577 switch (ioctl) {
9a2bb7f4 2578 case KVM_RUN:
f0fe5108
AK		 2579 r = -EINVAL;
2580 if (arg)
2581 goto out;
9a2bb7f4 2582 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
6aa8b732 2583 break;
6aa8b732
AK		 2584 case KVM_GET_REGS: {
2585 struct kvm_regs kvm_regs;
2586
bccf2150
AK		 2587 memset(&kvm_regs, 0, sizeof kvm_regs);
2588 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2589 if (r)
2590 goto out;
2591 r = -EFAULT;
2f366987 2592 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 2593 goto out;
2594 r = 0;
2595 break;
2596 }
2597 case KVM_SET_REGS: {
2598 struct kvm_regs kvm_regs;
2599
2600 r = -EFAULT;
2f366987 2601 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732 2602 goto out;
bccf2150 2603 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2604 if (r)
2605 goto out;
2606 r = 0;
2607 break;
2608 }
2609 case KVM_GET_SREGS: {
2610 struct kvm_sregs kvm_sregs;
2611
bccf2150
AK		 2612 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2613 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2614 if (r)
2615 goto out;
2616 r = -EFAULT;
2f366987 2617 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 2618 goto out;
2619 r = 0;
2620 break;
2621 }
2622 case KVM_SET_SREGS: {
2623 struct kvm_sregs kvm_sregs;
2624
2625 r = -EFAULT;
2f366987 2626 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732 2627 goto out;
bccf2150 2628 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2629 if (r)
2630 goto out;
2631 r = 0;
2632 break;
2633 }
2634 case KVM_TRANSLATE: {
2635 struct kvm_translation tr;
2636
2637 r = -EFAULT;
2f366987 2638 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732 2639 goto out;
bccf2150 2640 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
6aa8b732
AK		 2641 if (r)
2642 goto out;
2643 r = -EFAULT;
2f366987 2644 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 2645 goto out;
2646 r = 0;
2647 break;
2648 }
2649 case KVM_INTERRUPT: {
2650 struct kvm_interrupt irq;
2651
2652 r = -EFAULT;
2f366987 2653 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732 2654 goto out;
bccf2150 2655 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
6aa8b732
AK		 2656 if (r)
2657 goto out;
2658 r = 0;
2659 break;
2660 }
2661 case KVM_DEBUG_GUEST: {
2662 struct kvm_debug_guest dbg;
2663
2664 r = -EFAULT;
2f366987 2665 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732 2666 goto out;
bccf2150 2667 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
6aa8b732
AK		 2668 if (r)
2669 goto out;
2670 r = 0;
2671 break;
2672 }
bccf2150
AK		 2673 case KVM_GET_MSRS:
2674 r = msr_io(vcpu, argp, get_msr, 1);
2675 break;
2676 case KVM_SET_MSRS:
2677 r = msr_io(vcpu, argp, do_set_msr, 0);
2678 break;
06465c5a
AK		 2679 case KVM_SET_CPUID: {
2680 struct kvm_cpuid __user *cpuid_arg = argp;
2681 struct kvm_cpuid cpuid;
2682
2683 r = -EFAULT;
2684 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2685 goto out;
2686 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2687 if (r)
2688 goto out;
2689 break;
2690 }
1961d276
AK		 2691 case KVM_SET_SIGNAL_MASK: {
2692 struct kvm_signal_mask __user *sigmask_arg = argp;
2693 struct kvm_signal_mask kvm_sigmask;
2694 sigset_t sigset, *p;
2695
2696 p = NULL;
2697 if (argp) {
2698 r = -EFAULT;
2699 if (copy_from_user(&kvm_sigmask, argp,
2700 sizeof kvm_sigmask))
2701 goto out;
2702 r = -EINVAL;
2703 if (kvm_sigmask.len != sizeof sigset)
2704 goto out;
2705 r = -EFAULT;
2706 if (copy_from_user(&sigset, sigmask_arg->sigset,
2707 sizeof sigset))
2708 goto out;
2709 p = &sigset;
2710 }
2711 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2712 break;
2713 }
b8836737
AK		 2714 case KVM_GET_FPU: {
2715 struct kvm_fpu fpu;
2716
2717 memset(&fpu, 0, sizeof fpu);
2718 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
2719 if (r)
2720 goto out;
2721 r = -EFAULT;
2722 if (copy_to_user(argp, &fpu, sizeof fpu))
2723 goto out;
2724 r = 0;
2725 break;
2726 }
2727 case KVM_SET_FPU: {
2728 struct kvm_fpu fpu;
2729
2730 r = -EFAULT;
2731 if (copy_from_user(&fpu, argp, sizeof fpu))
2732 goto out;
2733 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
2734 if (r)
2735 goto out;
2736 r = 0;
2737 break;
2738 }
bccf2150
AK		 2739 default:
2740 ;
2741 }
2742out:
2743 return r;
2744}
2745
2746static long kvm_vm_ioctl(struct file *filp,
2747 unsigned int ioctl, unsigned long arg)
2748{
2749 struct kvm *kvm = filp->private_data;
2750 void __user *argp = (void __user *)arg;
2751 int r = -EINVAL;
2752
2753 switch (ioctl) {
2754 case KVM_CREATE_VCPU:
2755 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2756 if (r < 0)
2757 goto out;
2758 break;
6aa8b732
AK		 2759 case KVM_SET_MEMORY_REGION: {
2760 struct kvm_memory_region kvm_mem;
2761
2762 r = -EFAULT;
2f366987 2763 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
6aa8b732 2764 goto out;
2c6f5df9 2765 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
6aa8b732
AK		 2766 if (r)
2767 goto out;
2768 break;
2769 }
2770 case KVM_GET_DIRTY_LOG: {
2771 struct kvm_dirty_log log;
2772
2773 r = -EFAULT;
2f366987 2774 if (copy_from_user(&log, argp, sizeof log))
6aa8b732 2775 goto out;
2c6f5df9 2776 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
6aa8b732
AK		 2777 if (r)
2778 goto out;
2779 break;
2780 }
e8207547
AK		 2781 case KVM_SET_MEMORY_ALIAS: {
2782 struct kvm_memory_alias alias;
2783
2784 r = -EFAULT;
2785 if (copy_from_user(&alias, argp, sizeof alias))
2786 goto out;
2787 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
2788 if (r)
2789 goto out;
2790 break;
2791 }
f17abe9a
AK		 2792 default:
2793 ;
2794 }
2795out:
2796 return r;
2797}
2798
2799static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2800 unsigned long address,
2801 int *type)
2802{
2803 struct kvm *kvm = vma->vm_file->private_data;
2804 unsigned long pgoff;
f17abe9a
AK		 2805 struct page *page;
2806
2807 *type = VM_FAULT_MINOR;
2808 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
954bbbc2 2809 page = gfn_to_page(kvm, pgoff);
f17abe9a
AK		 2810 if (!page)
2811 return NOPAGE_SIGBUS;
2812 get_page(page);
2813 return page;
2814}
2815
2816static struct vm_operations_struct kvm_vm_vm_ops = {
2817 .nopage = kvm_vm_nopage,
2818};
2819
2820static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2821{
2822 vma->vm_ops = &kvm_vm_vm_ops;
2823 return 0;
2824}
2825
2826static struct file_operations kvm_vm_fops = {
2827 .release = kvm_vm_release,
2828 .unlocked_ioctl = kvm_vm_ioctl,
2829 .compat_ioctl = kvm_vm_ioctl,
2830 .mmap = kvm_vm_mmap,
2831};
2832
2833static int kvm_dev_ioctl_create_vm(void)
2834{
2835 int fd, r;
2836 struct inode *inode;
2837 struct file *file;
2838 struct kvm *kvm;
2839
2840 inode = kvmfs_inode(&kvm_vm_fops);
2841 if (IS_ERR(inode)) {
2842 r = PTR_ERR(inode);
2843 goto out1;
2844 }
2845
2846 kvm = kvm_create_vm();
2847 if (IS_ERR(kvm)) {
2848 r = PTR_ERR(kvm);
2849 goto out2;
2850 }
2851
2852 file = kvmfs_file(inode, kvm);
2853 if (IS_ERR(file)) {
2854 r = PTR_ERR(file);
2855 goto out3;
2856 }
bccf2150 2857 kvm->filp = file;
f17abe9a
AK		 2858
2859 r = get_unused_fd();
2860 if (r < 0)
2861 goto out4;
2862 fd = r;
2863 fd_install(fd, file);
2864
2865 return fd;
2866
2867out4:
2868 fput(file);
2869out3:
2870 kvm_destroy_vm(kvm);
2871out2:
2872 iput(inode);
2873out1:
2874 return r;
2875}
2876
2877static long kvm_dev_ioctl(struct file *filp,
2878 unsigned int ioctl, unsigned long arg)
2879{
2880 void __user *argp = (void __user *)arg;
07c45a36 2881 long r = -EINVAL;
f17abe9a
AK		 2882
2883 switch (ioctl) {
2884 case KVM_GET_API_VERSION:
f0fe5108
AK		 2885 r = -EINVAL;
2886 if (arg)
2887 goto out;
f17abe9a
AK		 2888 r = KVM_API_VERSION;
2889 break;
2890 case KVM_CREATE_VM:
f0fe5108
AK		 2891 r = -EINVAL;
2892 if (arg)
2893 goto out;
f17abe9a
AK		 2894 r = kvm_dev_ioctl_create_vm();
2895 break;
6aa8b732 2896 case KVM_GET_MSR_INDEX_LIST: {
2f366987 2897 struct kvm_msr_list __user *user_msr_list = argp;
6aa8b732
AK		 2898 struct kvm_msr_list msr_list;
2899 unsigned n;
2900
2901 r = -EFAULT;
2902 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2903 goto out;
2904 n = msr_list.nmsrs;
6f00e68f 2905 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
6aa8b732
AK		 2906 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2907 goto out;
2908 r = -E2BIG;
bf591b24 2909 if (n < num_msrs_to_save)
6aa8b732
AK		 2910 goto out;
2911 r = -EFAULT;
2912 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 2913 num_msrs_to_save * sizeof(u32)))
6aa8b732 2914 goto out;
6f00e68f
AK		 2915 if (copy_to_user(user_msr_list->indices
2916 + num_msrs_to_save * sizeof(u32),
2917 &emulated_msrs,
2918 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2919 goto out;
6aa8b732 2920 r = 0;
cc1d8955 2921 break;
6aa8b732 2922 }
5d308f45
AK		 2923 case KVM_CHECK_EXTENSION:
2924 /*
2925 * No extensions defined at present.
2926 */
2927 r = 0;
2928 break;
07c45a36
AK		 2929 case KVM_GET_VCPU_MMAP_SIZE:
2930 r = -EINVAL;
2931 if (arg)
2932 goto out;
039576c0 2933 r = 2 * PAGE_SIZE;
07c45a36 2934 break;
6aa8b732
AK		 2935 default:
2936 ;
2937 }
2938out:
2939 return r;
2940}
2941
6aa8b732
AK		 2942static struct file_operations kvm_chardev_ops = {
2943 .open = kvm_dev_open,
2944 .release = kvm_dev_release,
2945 .unlocked_ioctl = kvm_dev_ioctl,
2946 .compat_ioctl = kvm_dev_ioctl,
6aa8b732
AK		 2947};
2948
2949static struct miscdevice kvm_dev = {
bbe4432e 2950 KVM_MINOR,
6aa8b732
AK		 2951 "kvm",
2952 &kvm_chardev_ops,
2953};
2954
2955static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2956 void *v)
2957{
2958 if (val == SYS_RESTART) {
2959 /*
2960 * Some (well, at least mine) BIOSes hang on reboot if
2961 * in vmx root mode.
2962 */
2963 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
8b6d44c7 2964 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2965 }
2966 return NOTIFY_OK;
2967}
2968
2969static struct notifier_block kvm_reboot_notifier = {
2970 .notifier_call = kvm_reboot,
2971 .priority = 0,
2972};
2973
774c47f1
AK		 2974/*
2975 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2976 * cached on it.
2977 */
2978static void decache_vcpus_on_cpu(int cpu)
2979{
2980 struct kvm *vm;
2981 struct kvm_vcpu *vcpu;
2982 int i;
2983
2984 spin_lock(&kvm_lock);
2985 list_for_each_entry(vm, &vm_list, vm_list)
2986 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2987 vcpu = &vm->vcpus[i];
2988 /*
2989 * If the vcpu is locked, then it is running on some
2990 * other cpu and therefore it is not cached on the
2991 * cpu in question.
2992 *
2993 * If it's not locked, check the last cpu it executed
2994 * on.
2995 */
2996 if (mutex_trylock(&vcpu->mutex)) {
2997 if (vcpu->cpu == cpu) {
2998 kvm_arch_ops->vcpu_decache(vcpu);
2999 vcpu->cpu = -1;
3000 }
3001 mutex_unlock(&vcpu->mutex);
3002 }
3003 }
3004 spin_unlock(&kvm_lock);
3005}
3006
3007static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
3008 void *v)
3009{
3010 int cpu = (long)v;
3011
3012 switch (val) {
43934a38 3013 case CPU_DOWN_PREPARE:
8bb78442 3014 case CPU_DOWN_PREPARE_FROZEN:
774c47f1 3015 case CPU_UP_CANCELED:
8bb78442 3016 case CPU_UP_CANCELED_FROZEN:
43934a38
JK		 3017 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
3018 cpu);
774c47f1
AK		 3019 decache_vcpus_on_cpu(cpu);
3020 smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
3021 NULL, 0, 1);
3022 break;
43934a38 3023 case CPU_ONLINE:
8bb78442 3024 case CPU_ONLINE_FROZEN:
43934a38
JK		 3025 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
3026 cpu);
774c47f1
AK		 3027 smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
3028 NULL, 0, 1);
3029 break;
3030 }
3031 return NOTIFY_OK;
3032}
3033
3034static struct notifier_block kvm_cpu_notifier = {
3035 .notifier_call = kvm_cpu_hotplug,
3036 .priority = 20, /* must be > scheduler priority */
3037};
3038
1165f5fe
AK		 3039static u64 stat_get(void *_offset)
3040{
3041 unsigned offset = (long)_offset;
3042 u64 total = 0;
3043 struct kvm *kvm;
3044 struct kvm_vcpu *vcpu;
3045 int i;
3046
3047 spin_lock(&kvm_lock);
3048 list_for_each_entry(kvm, &vm_list, vm_list)
3049 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3050 vcpu = &kvm->vcpus[i];
3051 total += *(u32 *)((void *)vcpu + offset);
3052 }
3053 spin_unlock(&kvm_lock);
3054 return total;
3055}
3056
3057static void stat_set(void *offset, u64 val)
3058{
3059}
3060
3061DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, stat_set, "%llu\n");
3062
6aa8b732
AK		 3063static __init void kvm_init_debug(void)
3064{
3065 struct kvm_stats_debugfs_item *p;
3066
8b6d44c7 3067 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732 3068 for (p = debugfs_entries; p->name; ++p)
1165f5fe
AK		 3069 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
3070 (void *)(long)p->offset,
3071 &stat_fops);
6aa8b732
AK		 3072}
3073
3074static void kvm_exit_debug(void)
3075{
3076 struct kvm_stats_debugfs_item *p;
3077
3078 for (p = debugfs_entries; p->name; ++p)
3079 debugfs_remove(p->dentry);
3080 debugfs_remove(debugfs_dir);
3081}
3082
59ae6c6b
AK		 3083static int kvm_suspend(struct sys_device *dev, pm_message_t state)
3084{
3085 decache_vcpus_on_cpu(raw_smp_processor_id());
19d1408d 3086 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
59ae6c6b
AK		 3087 return 0;
3088}
3089
3090static int kvm_resume(struct sys_device *dev)
3091{
19d1408d 3092 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
59ae6c6b
AK		 3093 return 0;
3094}
3095
3096static struct sysdev_class kvm_sysdev_class = {
3097 set_kset_name("kvm"),
3098 .suspend = kvm_suspend,
3099 .resume = kvm_resume,
3100};
3101
3102static struct sys_device kvm_sysdev = {
3103 .id = 0,
3104 .cls = &kvm_sysdev_class,
3105};
3106
6aa8b732
AK		 3107hpa_t bad_page_address;
3108
37e29d90
AK		 3109static int kvmfs_get_sb(struct file_system_type *fs_type, int flags,
3110 const char *dev_name, void *data, struct vfsmount *mnt)
3111{
e9cdb1e3 3112 return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_SUPER_MAGIC, mnt);
37e29d90
AK		 3113}
3114
3115static struct file_system_type kvm_fs_type = {
3116 .name = "kvmfs",
3117 .get_sb = kvmfs_get_sb,
3118 .kill_sb = kill_anon_super,
3119};
3120
6aa8b732
AK		 3121int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
3122{
3123 int r;
3124
09db28b8
YI		 3125 if (kvm_arch_ops) {
3126 printk(KERN_ERR "kvm: already loaded the other module\n");
3127 return -EEXIST;
3128 }
3129
e097f35c 3130 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 3131 printk(KERN_ERR "kvm: no hardware support\n");
3132 return -EOPNOTSUPP;
3133 }
e097f35c 3134 if (ops->disabled_by_bios()) {
6aa8b732
AK		 3135 printk(KERN_ERR "kvm: disabled by bios\n");
3136 return -EOPNOTSUPP;
3137 }
3138
e097f35c
YI		 3139 kvm_arch_ops = ops;
3140
6aa8b732
AK		 3141 r = kvm_arch_ops->hardware_setup();
3142 if (r < 0)
ca45aaae 3143 goto out;
6aa8b732 3144
8b6d44c7 3145 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
774c47f1
AK		 3146 r = register_cpu_notifier(&kvm_cpu_notifier);
3147 if (r)
3148 goto out_free_1;
6aa8b732
AK		 3149 register_reboot_notifier(&kvm_reboot_notifier);
3150
59ae6c6b
AK		 3151 r = sysdev_class_register(&kvm_sysdev_class);
3152 if (r)
3153 goto out_free_2;
3154
3155 r = sysdev_register(&kvm_sysdev);
3156 if (r)
3157 goto out_free_3;
3158
6aa8b732
AK		 3159 kvm_chardev_ops.owner = module;
3160
3161 r = misc_register(&kvm_dev);
3162 if (r) {
3163 printk (KERN_ERR "kvm: misc device register failed\n");
3164 goto out_free;
3165 }
3166
3167 return r;
3168
3169out_free:
59ae6c6b
AK		 3170 sysdev_unregister(&kvm_sysdev);
3171out_free_3:
3172 sysdev_class_unregister(&kvm_sysdev_class);
3173out_free_2:
6aa8b732 3174 unregister_reboot_notifier(&kvm_reboot_notifier);
774c47f1
AK		 3175 unregister_cpu_notifier(&kvm_cpu_notifier);
3176out_free_1:
8b6d44c7 3177 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 3178 kvm_arch_ops->hardware_unsetup();
ca45aaae
AK		 3179out:
3180 kvm_arch_ops = NULL;
6aa8b732
AK		 3181 return r;
3182}
3183
3184void kvm_exit_arch(void)
3185{
3186 misc_deregister(&kvm_dev);
59ae6c6b
AK		 3187 sysdev_unregister(&kvm_sysdev);
3188 sysdev_class_unregister(&kvm_sysdev_class);
6aa8b732 3189 unregister_reboot_notifier(&kvm_reboot_notifier);
59ae6c6b 3190 unregister_cpu_notifier(&kvm_cpu_notifier);
8b6d44c7 3191 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 3192 kvm_arch_ops->hardware_unsetup();
09db28b8 3193 kvm_arch_ops = NULL;
6aa8b732
AK		 3194}
3195
3196static __init int kvm_init(void)
3197{
3198 static struct page *bad_page;
37e29d90
AK		 3199 int r;
3200
b5a33a75
AK		 3201 r = kvm_mmu_module_init();
3202 if (r)
3203 goto out4;
3204
37e29d90
AK		 3205 r = register_filesystem(&kvm_fs_type);
3206 if (r)
3207 goto out3;
6aa8b732 3208
37e29d90
AK		 3209 kvmfs_mnt = kern_mount(&kvm_fs_type);
3210 r = PTR_ERR(kvmfs_mnt);
3211 if (IS_ERR(kvmfs_mnt))
3212 goto out2;
6aa8b732
AK		 3213 kvm_init_debug();
3214
bf591b24
MR		 3215 kvm_init_msr_list();
3216
6aa8b732
AK		 3217 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3218 r = -ENOMEM;
3219 goto out;
3220 }
3221
3222 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3223 memset(__va(bad_page_address), 0, PAGE_SIZE);
3224
58e690e6 3225 return 0;
6aa8b732
AK		 3226
3227out:
3228 kvm_exit_debug();
37e29d90
AK		 3229 mntput(kvmfs_mnt);
3230out2:
3231 unregister_filesystem(&kvm_fs_type);
3232out3:
b5a33a75
AK		 3233 kvm_mmu_module_exit();
3234out4:
6aa8b732
AK		 3235 return r;
3236}
3237
3238static __exit void kvm_exit(void)
3239{
3240 kvm_exit_debug();
3241 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
37e29d90
AK		 3242 mntput(kvmfs_mnt);
3243 unregister_filesystem(&kvm_fs_type);
b5a33a75 3244 kvm_mmu_module_exit();
6aa8b732
AK		 3245}
3246
3247module_init(kvm_init)
3248module_exit(kvm_exit)
3249
3250EXPORT_SYMBOL_GPL(kvm_init_arch);
3251EXPORT_SYMBOL_GPL(kvm_exit_arch);
Linux kernel - Deliverables
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