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KVM: SVM: Reliably detect if SVM was disabled by BIOS
[linux-2.6-block.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 363
74906345 364 kvm_io_bus_init(&kvm->pio_bus);
6aa8b732
AK		 365 spin_lock_init(&kvm->lock);
366 INIT_LIST_HEAD(&kvm->active_mmu_pages);
120e9a45
AK		 367 spin_lock(&kvm_lock);
368 list_add(&kvm->vm_list, &vm_list);
369 spin_unlock(&kvm_lock);
2eeb2e94 370 kvm_io_bus_init(&kvm->mmio_bus);
6aa8b732
AK		 371 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
372 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
373
374 mutex_init(&vcpu->mutex);
133de902 375 vcpu->cpu = -1;
86a2b42e 376 vcpu->kvm = kvm;
6aa8b732 377 vcpu->mmu.root_hpa = INVALID_PAGE;
6aa8b732 378 }
f17abe9a
AK		 379 return kvm;
380}
381
382static int kvm_dev_open(struct inode *inode, struct file *filp)
383{
6aa8b732
AK		 384 return 0;
385}
386
387/*
388 * Free any memory in @free but not in @dont.
389 */
390static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
391 struct kvm_memory_slot *dont)
392{
393 int i;
394
395 if (!dont || free->phys_mem != dont->phys_mem)
396 if (free->phys_mem) {
397 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 398 if (free->phys_mem[i])
399 __free_page(free->phys_mem[i]);
6aa8b732
AK		 400 vfree(free->phys_mem);
401 }
402
403 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
404 vfree(free->dirty_bitmap);
405
8b6d44c7 406 free->phys_mem = NULL;
6aa8b732 407 free->npages = 0;
8b6d44c7 408 free->dirty_bitmap = NULL;
6aa8b732
AK		 409}
410
411static void kvm_free_physmem(struct kvm *kvm)
412{
413 int i;
414
415 for (i = 0; i < kvm->nmemslots; ++i)
8b6d44c7 416 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
6aa8b732
AK		 417}
418
039576c0
AK		 419static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
420{
421 int i;
422
423 for (i = 0; i < 2; ++i)
424 if (vcpu->pio.guest_pages[i]) {
425 __free_page(vcpu->pio.guest_pages[i]);
426 vcpu->pio.guest_pages[i] = NULL;
427 }
428}
429
7b53aa56
AK		 430static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
431{
432 if (!vcpu->vmcs)
433 return;
434
435 vcpu_load(vcpu);
436 kvm_mmu_unload(vcpu);
437 vcpu_put(vcpu);
438}
439
6aa8b732
AK		 440static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
441{
bccf2150 442 if (!vcpu->vmcs)
1e8ba6fb
IM		 443 return;
444
bccf2150 445 vcpu_load(vcpu);
6aa8b732 446 kvm_mmu_destroy(vcpu);
08438475 447 vcpu_put(vcpu);
9ede74e0 448 kvm_arch_ops->vcpu_free(vcpu);
9a2bb7f4
AK		 449 free_page((unsigned long)vcpu->run);
450 vcpu->run = NULL;
039576c0
AK		 451 free_page((unsigned long)vcpu->pio_data);
452 vcpu->pio_data = NULL;
453 free_pio_guest_pages(vcpu);
6aa8b732
AK		 454}
455
456static void kvm_free_vcpus(struct kvm *kvm)
457{
458 unsigned int i;
459
7b53aa56
AK		 460 /*
461 * Unpin any mmu pages first.
462 */
463 for (i = 0; i < KVM_MAX_VCPUS; ++i)
464 kvm_unload_vcpu_mmu(&kvm->vcpus[i]);
6aa8b732
AK		 465 for (i = 0; i < KVM_MAX_VCPUS; ++i)
466 kvm_free_vcpu(&kvm->vcpus[i]);
467}
468
469static int kvm_dev_release(struct inode *inode, struct file *filp)
470{
f17abe9a
AK		 471 return 0;
472}
6aa8b732 473
f17abe9a
AK		 474static void kvm_destroy_vm(struct kvm *kvm)
475{
133de902
AK		 476 spin_lock(&kvm_lock);
477 list_del(&kvm->vm_list);
478 spin_unlock(&kvm_lock);
74906345 479 kvm_io_bus_destroy(&kvm->pio_bus);
2eeb2e94 480 kvm_io_bus_destroy(&kvm->mmio_bus);
6aa8b732
AK		 481 kvm_free_vcpus(kvm);
482 kvm_free_physmem(kvm);
483 kfree(kvm);
f17abe9a
AK		 484}
485
486static int kvm_vm_release(struct inode *inode, struct file *filp)
487{
488 struct kvm *kvm = filp->private_data;
489
490 kvm_destroy_vm(kvm);
6aa8b732
AK		 491 return 0;
492}
493
494static void inject_gp(struct kvm_vcpu *vcpu)
495{
496 kvm_arch_ops->inject_gp(vcpu, 0);
497}
498
1342d353
AK		 499/*
500 * Load the pae pdptrs. Return true is they are all valid.
501 */
502static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
6aa8b732
AK		 503{
504 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
1342d353 505 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
6aa8b732
AK		 506 int i;
507 u64 pdpte;
508 u64 *pdpt;
1342d353 509 int ret;
954bbbc2 510 struct page *page;
6aa8b732
AK		 511
512 spin_lock(&vcpu->kvm->lock);
954bbbc2
AK		 513 page = gfn_to_page(vcpu->kvm, pdpt_gfn);
514 /* FIXME: !page - emulate? 0xff? */
515 pdpt = kmap_atomic(page, KM_USER0);
6aa8b732 516
1342d353 517 ret = 1;
6aa8b732
AK		 518 for (i = 0; i < 4; ++i) {
519 pdpte = pdpt[offset + i];
1342d353
AK		 520 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
521 ret = 0;
522 goto out;
523 }
6aa8b732
AK		 524 }
525
1342d353
AK		 526 for (i = 0; i < 4; ++i)
527 vcpu->pdptrs[i] = pdpt[offset + i];
528
529out:
6aa8b732
AK		 530 kunmap_atomic(pdpt, KM_USER0);
531 spin_unlock(&vcpu->kvm->lock);
532
1342d353 533 return ret;
6aa8b732
AK		 534}
535
536void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
537{
538 if (cr0 & CR0_RESEVED_BITS) {
539 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
540 cr0, vcpu->cr0);
541 inject_gp(vcpu);
542 return;
543 }
544
545 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
546 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
547 inject_gp(vcpu);
548 return;
549 }
550
551 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
552 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
553 "and a clear PE flag\n");
554 inject_gp(vcpu);
555 return;
556 }
557
558 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 559#ifdef CONFIG_X86_64
6aa8b732
AK		 560 if ((vcpu->shadow_efer & EFER_LME)) {
561 int cs_db, cs_l;
562
563 if (!is_pae(vcpu)) {
564 printk(KERN_DEBUG "set_cr0: #GP, start paging "
565 "in long mode while PAE is disabled\n");
566 inject_gp(vcpu);
567 return;
568 }
569 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
570 if (cs_l) {
571 printk(KERN_DEBUG "set_cr0: #GP, start paging "
572 "in long mode while CS.L == 1\n");
573 inject_gp(vcpu);
574 return;
575
576 }
577 } else
578#endif
1342d353 579 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 580 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
581 "reserved bits\n");
582 inject_gp(vcpu);
583 return;
584 }
585
586 }
587
588 kvm_arch_ops->set_cr0(vcpu, cr0);
589 vcpu->cr0 = cr0;
590
591 spin_lock(&vcpu->kvm->lock);
592 kvm_mmu_reset_context(vcpu);
593 spin_unlock(&vcpu->kvm->lock);
594 return;
595}
596EXPORT_SYMBOL_GPL(set_cr0);
597
598void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
599{
600 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
601}
602EXPORT_SYMBOL_GPL(lmsw);
603
604void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
605{
606 if (cr4 & CR4_RESEVED_BITS) {
607 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
608 inject_gp(vcpu);
609 return;
610 }
611
a9058ecd 612 if (is_long_mode(vcpu)) {
6aa8b732
AK		 613 if (!(cr4 & CR4_PAE_MASK)) {
614 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
615 "in long mode\n");
616 inject_gp(vcpu);
617 return;
618 }
619 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
1342d353 620 && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 621 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
622 inject_gp(vcpu);
623 }
624
625 if (cr4 & CR4_VMXE_MASK) {
626 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
627 inject_gp(vcpu);
628 return;
629 }
630 kvm_arch_ops->set_cr4(vcpu, cr4);
631 spin_lock(&vcpu->kvm->lock);
632 kvm_mmu_reset_context(vcpu);
633 spin_unlock(&vcpu->kvm->lock);
634}
635EXPORT_SYMBOL_GPL(set_cr4);
636
637void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
638{
a9058ecd 639 if (is_long_mode(vcpu)) {
d27d4aca 640 if (cr3 & CR3_L_MODE_RESEVED_BITS) {
6aa8b732
AK		 641 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
642 inject_gp(vcpu);
643 return;
644 }
645 } else {
646 if (cr3 & CR3_RESEVED_BITS) {
647 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
648 inject_gp(vcpu);
649 return;
650 }
651 if (is_paging(vcpu) && is_pae(vcpu) &&
1342d353 652 !load_pdptrs(vcpu, cr3)) {
6aa8b732
AK		 653 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
654 "reserved bits\n");
655 inject_gp(vcpu);
656 return;
657 }
658 }
659
660 vcpu->cr3 = cr3;
661 spin_lock(&vcpu->kvm->lock);
d21225ee
IM		 662 /*
663 * Does the new cr3 value map to physical memory? (Note, we
664 * catch an invalid cr3 even in real-mode, because it would
665 * cause trouble later on when we turn on paging anyway.)
666 *
667 * A real CPU would silently accept an invalid cr3 and would
668 * attempt to use it - with largely undefined (and often hard
669 * to debug) behavior on the guest side.
670 */
671 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
672 inject_gp(vcpu);
673 else
674 vcpu->mmu.new_cr3(vcpu);
6aa8b732
AK		 675 spin_unlock(&vcpu->kvm->lock);
676}
677EXPORT_SYMBOL_GPL(set_cr3);
678
679void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
680{
681 if ( cr8 & CR8_RESEVED_BITS) {
682 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
683 inject_gp(vcpu);
684 return;
685 }
686 vcpu->cr8 = cr8;
687}
688EXPORT_SYMBOL_GPL(set_cr8);
689
690void fx_init(struct kvm_vcpu *vcpu)
691{
692 struct __attribute__ ((__packed__)) fx_image_s {
693 u16 control; //fcw
694 u16 status; //fsw
695 u16 tag; // ftw
696 u16 opcode; //fop
697 u64 ip; // fpu ip
698 u64 operand;// fpu dp
699 u32 mxcsr;
700 u32 mxcsr_mask;
701
702 } *fx_image;
703
704 fx_save(vcpu->host_fx_image);
705 fpu_init();
706 fx_save(vcpu->guest_fx_image);
707 fx_restore(vcpu->host_fx_image);
708
709 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
710 fx_image->mxcsr = 0x1f80;
711 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
712 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
713}
714EXPORT_SYMBOL_GPL(fx_init);
715
02b27c1f
UL		 716static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
717{
718 spin_lock(&vcpu->kvm->lock);
719 kvm_mmu_slot_remove_write_access(vcpu, slot);
720 spin_unlock(&vcpu->kvm->lock);
721}
722
6aa8b732
AK		 723/*
724 * Allocate some memory and give it an address in the guest physical address
725 * space.
726 *
727 * Discontiguous memory is allowed, mostly for framebuffers.
728 */
2c6f5df9
AK		 729static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
730 struct kvm_memory_region *mem)
6aa8b732
AK		 731{
732 int r;
733 gfn_t base_gfn;
734 unsigned long npages;
735 unsigned long i;
736 struct kvm_memory_slot *memslot;
737 struct kvm_memory_slot old, new;
738 int memory_config_version;
739
740 r = -EINVAL;
741 /* General sanity checks */
742 if (mem->memory_size & (PAGE_SIZE - 1))
743 goto out;
744 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
745 goto out;
746 if (mem->slot >= KVM_MEMORY_SLOTS)
747 goto out;
748 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
749 goto out;
750
751 memslot = &kvm->memslots[mem->slot];
752 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
753 npages = mem->memory_size >> PAGE_SHIFT;
754
755 if (!npages)
756 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
757
758raced:
759 spin_lock(&kvm->lock);
760
761 memory_config_version = kvm->memory_config_version;
762 new = old = *memslot;
763
764 new.base_gfn = base_gfn;
765 new.npages = npages;
766 new.flags = mem->flags;
767
768 /* Disallow changing a memory slot's size. */
769 r = -EINVAL;
770 if (npages && old.npages && npages != old.npages)
771 goto out_unlock;
772
773 /* Check for overlaps */
774 r = -EEXIST;
775 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
776 struct kvm_memory_slot *s = &kvm->memslots[i];
777
778 if (s == memslot)
779 continue;
780 if (!((base_gfn + npages <= s->base_gfn) ||
781 (base_gfn >= s->base_gfn + s->npages)))
782 goto out_unlock;
783 }
784 /*
785 * Do memory allocations outside lock. memory_config_version will
786 * detect any races.
787 */
788 spin_unlock(&kvm->lock);
789
790 /* Deallocate if slot is being removed */
791 if (!npages)
8b6d44c7 792 new.phys_mem = NULL;
6aa8b732
AK		 793
794 /* Free page dirty bitmap if unneeded */
795 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
8b6d44c7 796 new.dirty_bitmap = NULL;
6aa8b732
AK		 797
798 r = -ENOMEM;
799
800 /* Allocate if a slot is being created */
801 if (npages && !new.phys_mem) {
802 new.phys_mem = vmalloc(npages * sizeof(struct page *));
803
804 if (!new.phys_mem)
805 goto out_free;
806
807 memset(new.phys_mem, 0, npages * sizeof(struct page *));
808 for (i = 0; i < npages; ++i) {
809 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
810 | __GFP_ZERO);
811 if (!new.phys_mem[i])
812 goto out_free;
5972e953 813 set_page_private(new.phys_mem[i],0);
6aa8b732
AK		 814 }
815 }
816
817 /* Allocate page dirty bitmap if needed */
818 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
819 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
820
821 new.dirty_bitmap = vmalloc(dirty_bytes);
822 if (!new.dirty_bitmap)
823 goto out_free;
824 memset(new.dirty_bitmap, 0, dirty_bytes);
825 }
826
827 spin_lock(&kvm->lock);
828
829 if (memory_config_version != kvm->memory_config_version) {
830 spin_unlock(&kvm->lock);
831 kvm_free_physmem_slot(&new, &old);
832 goto raced;
833 }
834
835 r = -EAGAIN;
836 if (kvm->busy)
837 goto out_unlock;
838
839 if (mem->slot >= kvm->nmemslots)
840 kvm->nmemslots = mem->slot + 1;
841
842 *memslot = new;
843 ++kvm->memory_config_version;
844
845 spin_unlock(&kvm->lock);
846
847 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
848 struct kvm_vcpu *vcpu;
849
bccf2150 850 vcpu = vcpu_load_slot(kvm, i);
6aa8b732
AK		 851 if (!vcpu)
852 continue;
ff990d59
UL		 853 if (new.flags & KVM_MEM_LOG_DIRTY_PAGES)
854 do_remove_write_access(vcpu, mem->slot);
6aa8b732
AK		 855 kvm_mmu_reset_context(vcpu);
856 vcpu_put(vcpu);
857 }
858
859 kvm_free_physmem_slot(&old, &new);
860 return 0;
861
862out_unlock:
863 spin_unlock(&kvm->lock);
864out_free:
865 kvm_free_physmem_slot(&new, &old);
866out:
867 return r;
868}
869
870/*
871 * Get (and clear) the dirty memory log for a memory slot.
872 */
2c6f5df9
AK		 873static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
874 struct kvm_dirty_log *log)
6aa8b732
AK		 875{
876 struct kvm_memory_slot *memslot;
877 int r, i;
878 int n;
714b93da 879 int cleared;
6aa8b732
AK		 880 unsigned long any = 0;
881
882 spin_lock(&kvm->lock);
883
884 /*
885 * Prevent changes to guest memory configuration even while the lock
886 * is not taken.
887 */
888 ++kvm->busy;
889 spin_unlock(&kvm->lock);
890 r = -EINVAL;
891 if (log->slot >= KVM_MEMORY_SLOTS)
892 goto out;
893
894 memslot = &kvm->memslots[log->slot];
895 r = -ENOENT;
896 if (!memslot->dirty_bitmap)
897 goto out;
898
cd1a4a98 899 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
6aa8b732 900
cd1a4a98 901 for (i = 0; !any && i < n/sizeof(long); ++i)
6aa8b732
AK		 902 any = memslot->dirty_bitmap[i];
903
904 r = -EFAULT;
905 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
906 goto out;
907
6aa8b732 908 if (any) {
714b93da 909 cleared = 0;
6aa8b732 910 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
bccf2150 911 struct kvm_vcpu *vcpu;
6aa8b732 912
bccf2150 913 vcpu = vcpu_load_slot(kvm, i);
6aa8b732
AK		 914 if (!vcpu)
915 continue;
714b93da
AK		 916 if (!cleared) {
917 do_remove_write_access(vcpu, log->slot);
918 memset(memslot->dirty_bitmap, 0, n);
919 cleared = 1;
920 }
6aa8b732
AK		 921 kvm_arch_ops->tlb_flush(vcpu);
922 vcpu_put(vcpu);
923 }
924 }
925
926 r = 0;
927
928out:
929 spin_lock(&kvm->lock);
930 --kvm->busy;
931 spin_unlock(&kvm->lock);
932 return r;
933}
934
e8207547
AK		 935/*
936 * Set a new alias region. Aliases map a portion of physical memory into
937 * another portion. This is useful for memory windows, for example the PC
938 * VGA region.
939 */
940static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
941 struct kvm_memory_alias *alias)
942{
943 int r, n;
944 struct kvm_mem_alias *p;
945
946 r = -EINVAL;
947 /* General sanity checks */
948 if (alias->memory_size & (PAGE_SIZE - 1))
949 goto out;
950 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
951 goto out;
952 if (alias->slot >= KVM_ALIAS_SLOTS)
953 goto out;
954 if (alias->guest_phys_addr + alias->memory_size
955 < alias->guest_phys_addr)
956 goto out;
957 if (alias->target_phys_addr + alias->memory_size
958 < alias->target_phys_addr)
959 goto out;
960
961 spin_lock(&kvm->lock);
962
963 p = &kvm->aliases[alias->slot];
964 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
965 p->npages = alias->memory_size >> PAGE_SHIFT;
966 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
967
968 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
969 if (kvm->aliases[n - 1].npages)
970 break;
971 kvm->naliases = n;
972
973 spin_unlock(&kvm->lock);
974
975 vcpu_load(&kvm->vcpus[0]);
976 spin_lock(&kvm->lock);
977 kvm_mmu_zap_all(&kvm->vcpus[0]);
978 spin_unlock(&kvm->lock);
979 vcpu_put(&kvm->vcpus[0]);
980
981 return 0;
982
983out:
984 return r;
985}
986
987static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
988{
989 int i;
990 struct kvm_mem_alias *alias;
991
992 for (i = 0; i < kvm->naliases; ++i) {
993 alias = &kvm->aliases[i];
994 if (gfn >= alias->base_gfn
995 && gfn < alias->base_gfn + alias->npages)
996 return alias->target_gfn + gfn - alias->base_gfn;
997 }
998 return gfn;
999}
1000
1001static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
6aa8b732
AK		 1002{
1003 int i;
1004
1005 for (i = 0; i < kvm->nmemslots; ++i) {
1006 struct kvm_memory_slot *memslot = &kvm->memslots[i];
1007
1008 if (gfn >= memslot->base_gfn
1009 && gfn < memslot->base_gfn + memslot->npages)
1010 return memslot;
1011 }
8b6d44c7 1012 return NULL;
6aa8b732 1013}
e8207547
AK		 1014
1015struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1016{
1017 gfn = unalias_gfn(kvm, gfn);
1018 return __gfn_to_memslot(kvm, gfn);
1019}
6aa8b732 1020
954bbbc2
AK		 1021struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1022{
1023 struct kvm_memory_slot *slot;
1024
e8207547
AK		 1025 gfn = unalias_gfn(kvm, gfn);
1026 slot = __gfn_to_memslot(kvm, gfn);
954bbbc2
AK		 1027 if (!slot)
1028 return NULL;
1029 return slot->phys_mem[gfn - slot->base_gfn];
1030}
1031EXPORT_SYMBOL_GPL(gfn_to_page);
1032
6aa8b732
AK		 1033void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1034{
1035 int i;
31389947 1036 struct kvm_memory_slot *memslot;
6aa8b732
AK		 1037 unsigned long rel_gfn;
1038
1039 for (i = 0; i < kvm->nmemslots; ++i) {
1040 memslot = &kvm->memslots[i];
1041
1042 if (gfn >= memslot->base_gfn
1043 && gfn < memslot->base_gfn + memslot->npages) {
1044
31389947 1045 if (!memslot->dirty_bitmap)
6aa8b732
AK		 1046 return;
1047
1048 rel_gfn = gfn - memslot->base_gfn;
1049
1050 /* avoid RMW */
1051 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
1052 set_bit(rel_gfn, memslot->dirty_bitmap);
1053 return;
1054 }
1055 }
1056}
1057
1058static int emulator_read_std(unsigned long addr,
4c690a1e 1059 void *val,
6aa8b732
AK		 1060 unsigned int bytes,
1061 struct x86_emulate_ctxt *ctxt)
1062{
1063 struct kvm_vcpu *vcpu = ctxt->vcpu;
1064 void *data = val;
1065
1066 while (bytes) {
1067 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1068 unsigned offset = addr & (PAGE_SIZE-1);
1069 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1070 unsigned long pfn;
954bbbc2
AK		 1071 struct page *page;
1072 void *page_virt;
6aa8b732
AK		 1073
1074 if (gpa == UNMAPPED_GVA)
1075 return X86EMUL_PROPAGATE_FAULT;
1076 pfn = gpa >> PAGE_SHIFT;
954bbbc2
AK		 1077 page = gfn_to_page(vcpu->kvm, pfn);
1078 if (!page)
6aa8b732 1079 return X86EMUL_UNHANDLEABLE;
954bbbc2 1080 page_virt = kmap_atomic(page, KM_USER0);
6aa8b732 1081
954bbbc2 1082 memcpy(data, page_virt + offset, tocopy);
6aa8b732 1083
954bbbc2 1084 kunmap_atomic(page_virt, KM_USER0);
6aa8b732
AK		 1085
1086 bytes -= tocopy;
1087 data += tocopy;
1088 addr += tocopy;
1089 }
1090
1091 return X86EMUL_CONTINUE;
1092}
1093
1094static int emulator_write_std(unsigned long addr,
4c690a1e 1095 const void *val,
6aa8b732
AK		 1096 unsigned int bytes,
1097 struct x86_emulate_ctxt *ctxt)
1098{
1099 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
1100 addr, bytes);
1101 return X86EMUL_UNHANDLEABLE;
1102}
1103
2eeb2e94
GH		 1104static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1105 gpa_t addr)
1106{
1107 /*
1108 * Note that its important to have this wrapper function because
1109 * in the very near future we will be checking for MMIOs against
1110 * the LAPIC as well as the general MMIO bus
1111 */
1112 return kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1113}
1114
74906345
ED		 1115static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
1116 gpa_t addr)
1117{
1118 return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
1119}
1120
6aa8b732 1121static int emulator_read_emulated(unsigned long addr,
4c690a1e 1122 void *val,
6aa8b732
AK		 1123 unsigned int bytes,
1124 struct x86_emulate_ctxt *ctxt)
1125{
2eeb2e94
GH		 1126 struct kvm_vcpu *vcpu = ctxt->vcpu;
1127 struct kvm_io_device *mmio_dev;
1128 gpa_t gpa;
6aa8b732
AK		 1129
1130 if (vcpu->mmio_read_completed) {
1131 memcpy(val, vcpu->mmio_data, bytes);
1132 vcpu->mmio_read_completed = 0;
1133 return X86EMUL_CONTINUE;
1134 } else if (emulator_read_std(addr, val, bytes, ctxt)
1135 == X86EMUL_CONTINUE)
1136 return X86EMUL_CONTINUE;
d27d4aca 1137
2eeb2e94
GH		 1138 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1139 if (gpa == UNMAPPED_GVA)
1140 return X86EMUL_PROPAGATE_FAULT;
6aa8b732 1141
2eeb2e94
GH		 1142 /*
1143 * Is this MMIO handled locally?
1144 */
1145 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1146 if (mmio_dev) {
1147 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1148 return X86EMUL_CONTINUE;
6aa8b732 1149 }
2eeb2e94
GH		 1150
1151 vcpu->mmio_needed = 1;
1152 vcpu->mmio_phys_addr = gpa;
1153 vcpu->mmio_size = bytes;
1154 vcpu->mmio_is_write = 0;
1155
1156 return X86EMUL_UNHANDLEABLE;
6aa8b732
AK		 1157}
1158
da4a00f0 1159static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
4c690a1e 1160 const void *val, int bytes)
da4a00f0 1161{
da4a00f0
AK		 1162 struct page *page;
1163 void *virt;
09072daf 1164 unsigned offset = offset_in_page(gpa);
da4a00f0
AK		 1165
1166 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
1167 return 0;
954bbbc2
AK		 1168 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1169 if (!page)
da4a00f0 1170 return 0;
ab51a434 1171 mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
da4a00f0 1172 virt = kmap_atomic(page, KM_USER0);
a3c870bd
LT		 1173 if (memcmp(virt + offset_in_page(gpa), val, bytes)) {
1174 kvm_mmu_pte_write(vcpu, gpa, virt + offset, val, bytes);
1175 memcpy(virt + offset_in_page(gpa), val, bytes);
1176 }
da4a00f0 1177 kunmap_atomic(virt, KM_USER0);
da4a00f0
AK		 1178 return 1;
1179}
1180
6aa8b732 1181static int emulator_write_emulated(unsigned long addr,
4c690a1e 1182 const void *val,
6aa8b732
AK		 1183 unsigned int bytes,
1184 struct x86_emulate_ctxt *ctxt)
1185{
2eeb2e94
GH		 1186 struct kvm_vcpu *vcpu = ctxt->vcpu;
1187 struct kvm_io_device *mmio_dev;
1188 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
6aa8b732 1189
c9047f53
AK		 1190 if (gpa == UNMAPPED_GVA) {
1191 kvm_arch_ops->inject_page_fault(vcpu, addr, 2);
6aa8b732 1192 return X86EMUL_PROPAGATE_FAULT;
c9047f53 1193 }
6aa8b732 1194
da4a00f0
AK		 1195 if (emulator_write_phys(vcpu, gpa, val, bytes))
1196 return X86EMUL_CONTINUE;
1197
2eeb2e94
GH		 1198 /*
1199 * Is this MMIO handled locally?
1200 */
1201 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1202 if (mmio_dev) {
1203 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1204 return X86EMUL_CONTINUE;
1205 }
1206
6aa8b732
AK		 1207 vcpu->mmio_needed = 1;
1208 vcpu->mmio_phys_addr = gpa;
1209 vcpu->mmio_size = bytes;
1210 vcpu->mmio_is_write = 1;
4c690a1e 1211 memcpy(vcpu->mmio_data, val, bytes);
6aa8b732
AK		 1212
1213 return X86EMUL_CONTINUE;
1214}
1215
1216static int emulator_cmpxchg_emulated(unsigned long addr,
4c690a1e
AK		 1217 const void *old,
1218 const void *new,
6aa8b732
AK		 1219 unsigned int bytes,
1220 struct x86_emulate_ctxt *ctxt)
1221{
1222 static int reported;
1223
1224 if (!reported) {
1225 reported = 1;
1226 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1227 }
1228 return emulator_write_emulated(addr, new, bytes, ctxt);
1229}
1230
1231static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1232{
1233 return kvm_arch_ops->get_segment_base(vcpu, seg);
1234}
1235
1236int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1237{
6aa8b732
AK		 1238 return X86EMUL_CONTINUE;
1239}
1240
1241int emulate_clts(struct kvm_vcpu *vcpu)
1242{
399badf3 1243 unsigned long cr0;
6aa8b732 1244
399badf3 1245 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
6aa8b732
AK		 1246 kvm_arch_ops->set_cr0(vcpu, cr0);
1247 return X86EMUL_CONTINUE;
1248}
1249
1250int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1251{
1252 struct kvm_vcpu *vcpu = ctxt->vcpu;
1253
1254 switch (dr) {
1255 case 0 ... 3:
1256 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1257 return X86EMUL_CONTINUE;
1258 default:
1259 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1260 __FUNCTION__, dr);
1261 return X86EMUL_UNHANDLEABLE;
1262 }
1263}
1264
1265int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1266{
1267 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1268 int exception;
1269
1270 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1271 if (exception) {
1272 /* FIXME: better handling */
1273 return X86EMUL_UNHANDLEABLE;
1274 }
1275 return X86EMUL_CONTINUE;
1276}
1277
1278static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1279{
1280 static int reported;
1281 u8 opcodes[4];
1282 unsigned long rip = ctxt->vcpu->rip;
1283 unsigned long rip_linear;
1284
1285 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1286
1287 if (reported)
1288 return;
1289
1290 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1291
1292 printk(KERN_ERR "emulation failed but !mmio_needed?"
1293 " rip %lx %02x %02x %02x %02x\n",
1294 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1295 reported = 1;
1296}
1297
1298struct x86_emulate_ops emulate_ops = {
1299 .read_std = emulator_read_std,
1300 .write_std = emulator_write_std,
1301 .read_emulated = emulator_read_emulated,
1302 .write_emulated = emulator_write_emulated,
1303 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1304};
1305
1306int emulate_instruction(struct kvm_vcpu *vcpu,
1307 struct kvm_run *run,
1308 unsigned long cr2,
1309 u16 error_code)
1310{
1311 struct x86_emulate_ctxt emulate_ctxt;
1312 int r;
1313 int cs_db, cs_l;
1314
e7df56e4 1315 vcpu->mmio_fault_cr2 = cr2;
6aa8b732
AK		 1316 kvm_arch_ops->cache_regs(vcpu);
1317
1318 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1319
1320 emulate_ctxt.vcpu = vcpu;
1321 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1322 emulate_ctxt.cr2 = cr2;
1323 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1324 ? X86EMUL_MODE_REAL : cs_l
1325 ? X86EMUL_MODE_PROT64 : cs_db
1326 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1327
1328 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1329 emulate_ctxt.cs_base = 0;
1330 emulate_ctxt.ds_base = 0;
1331 emulate_ctxt.es_base = 0;
1332 emulate_ctxt.ss_base = 0;
1333 } else {
1334 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1335 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1336 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1337 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1338 }
1339
1340 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1341 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1342
1343 vcpu->mmio_is_write = 0;
1344 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1345
1346 if ((r || vcpu->mmio_is_write) && run) {
1347 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1348 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1349 run->mmio.len = vcpu->mmio_size;
1350 run->mmio.is_write = vcpu->mmio_is_write;
1351 }
1352
1353 if (r) {
a436036b
AK		 1354 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1355 return EMULATE_DONE;
6aa8b732
AK		 1356 if (!vcpu->mmio_needed) {
1357 report_emulation_failure(&emulate_ctxt);
1358 return EMULATE_FAIL;
1359 }
1360 return EMULATE_DO_MMIO;
1361 }
1362
1363 kvm_arch_ops->decache_regs(vcpu);
1364 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1365
02c83209
AK		 1366 if (vcpu->mmio_is_write) {
1367 vcpu->mmio_needed = 0;
6aa8b732 1368 return EMULATE_DO_MMIO;
02c83209 1369 }
6aa8b732
AK		 1370
1371 return EMULATE_DONE;
1372}
1373EXPORT_SYMBOL_GPL(emulate_instruction);
1374
d3bef15f
AK		 1375int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1376{
1377 if (vcpu->irq_summary)
1378 return 1;
1379
1380 vcpu->run->exit_reason = KVM_EXIT_HLT;
1381 ++vcpu->stat.halt_exits;
1382 return 0;
1383}
1384EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1385
270fd9b9
AK		 1386int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1387{
1388 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1389
9b22bf57 1390 kvm_arch_ops->cache_regs(vcpu);
270fd9b9
AK		 1391 ret = -KVM_EINVAL;
1392#ifdef CONFIG_X86_64
1393 if (is_long_mode(vcpu)) {
1394 nr = vcpu->regs[VCPU_REGS_RAX];
1395 a0 = vcpu->regs[VCPU_REGS_RDI];
1396 a1 = vcpu->regs[VCPU_REGS_RSI];
1397 a2 = vcpu->regs[VCPU_REGS_RDX];
1398 a3 = vcpu->regs[VCPU_REGS_RCX];
1399 a4 = vcpu->regs[VCPU_REGS_R8];
1400 a5 = vcpu->regs[VCPU_REGS_R9];
1401 } else
1402#endif
1403 {
1404 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1405 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1406 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1407 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1408 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1409 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1410 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1411 }
1412 switch (nr) {
1413 default:
b4e63f56
AK		 1414 run->hypercall.args[0] = a0;
1415 run->hypercall.args[1] = a1;
1416 run->hypercall.args[2] = a2;
1417 run->hypercall.args[3] = a3;
1418 run->hypercall.args[4] = a4;
1419 run->hypercall.args[5] = a5;
1420 run->hypercall.ret = ret;
1421 run->hypercall.longmode = is_long_mode(vcpu);
1422 kvm_arch_ops->decache_regs(vcpu);
1423 return 0;
270fd9b9
AK		 1424 }
1425 vcpu->regs[VCPU_REGS_RAX] = ret;
9b22bf57 1426 kvm_arch_ops->decache_regs(vcpu);
270fd9b9
AK		 1427 return 1;
1428}
1429EXPORT_SYMBOL_GPL(kvm_hypercall);
1430
6aa8b732
AK		 1431static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1432{
1433 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1434}
1435
1436void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1437{
1438 struct descriptor_table dt = { limit, base };
1439
1440 kvm_arch_ops->set_gdt(vcpu, &dt);
1441}
1442
1443void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1444{
1445 struct descriptor_table dt = { limit, base };
1446
1447 kvm_arch_ops->set_idt(vcpu, &dt);
1448}
1449
1450void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1451 unsigned long *rflags)
1452{
1453 lmsw(vcpu, msw);
1454 *rflags = kvm_arch_ops->get_rflags(vcpu);
1455}
1456
1457unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1458{
25c4c276 1459 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 1460 switch (cr) {
1461 case 0:
1462 return vcpu->cr0;
1463 case 2:
1464 return vcpu->cr2;
1465 case 3:
1466 return vcpu->cr3;
1467 case 4:
1468 return vcpu->cr4;
1469 default:
1470 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1471 return 0;
1472 }
1473}
1474
1475void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1476 unsigned long *rflags)
1477{
1478 switch (cr) {
1479 case 0:
1480 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1481 *rflags = kvm_arch_ops->get_rflags(vcpu);
1482 break;
1483 case 2:
1484 vcpu->cr2 = val;
1485 break;
1486 case 3:
1487 set_cr3(vcpu, val);
1488 break;
1489 case 4:
1490 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1491 break;
1492 default:
1493 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1494 }
1495}
1496
102d8325
IM		 1497/*
1498 * Register the para guest with the host:
1499 */
1500static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1501{
1502 struct kvm_vcpu_para_state *para_state;
1503 hpa_t para_state_hpa, hypercall_hpa;
1504 struct page *para_state_page;
1505 unsigned char *hypercall;
1506 gpa_t hypercall_gpa;
1507
1508 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1509 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1510
1511 /*
1512 * Needs to be page aligned:
1513 */
1514 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1515 goto err_gp;
1516
1517 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1518 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1519 if (is_error_hpa(para_state_hpa))
1520 goto err_gp;
1521
ab51a434 1522 mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
102d8325
IM		 1523 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1524 para_state = kmap_atomic(para_state_page, KM_USER0);
1525
1526 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1527 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1528
1529 para_state->host_version = KVM_PARA_API_VERSION;
1530 /*
1531 * We cannot support guests that try to register themselves
1532 * with a newer API version than the host supports:
1533 */
1534 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1535 para_state->ret = -KVM_EINVAL;
1536 goto err_kunmap_skip;
1537 }
1538
1539 hypercall_gpa = para_state->hypercall_gpa;
1540 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1541 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1542 if (is_error_hpa(hypercall_hpa)) {
1543 para_state->ret = -KVM_EINVAL;
1544 goto err_kunmap_skip;
1545 }
1546
1547 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1548 vcpu->para_state_page = para_state_page;
1549 vcpu->para_state_gpa = para_state_gpa;
1550 vcpu->hypercall_gpa = hypercall_gpa;
1551
ab51a434 1552 mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
102d8325
IM		 1553 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1554 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1555 kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1556 kunmap_atomic(hypercall, KM_USER1);
1557
1558 para_state->ret = 0;
1559err_kunmap_skip:
1560 kunmap_atomic(para_state, KM_USER0);
1561 return 0;
1562err_gp:
1563 return 1;
1564}
1565
3bab1f5d
AK		 1566int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1567{
1568 u64 data;
1569
1570 switch (msr) {
1571 case 0xc0010010: /* SYSCFG */
1572 case 0xc0010015: /* HWCR */
1573 case MSR_IA32_PLATFORM_ID:
1574 case MSR_IA32_P5_MC_ADDR:
1575 case MSR_IA32_P5_MC_TYPE:
1576 case MSR_IA32_MC0_CTL:
1577 case MSR_IA32_MCG_STATUS:
1578 case MSR_IA32_MCG_CAP:
1579 case MSR_IA32_MC0_MISC:
1580 case MSR_IA32_MC0_MISC+4:
1581 case MSR_IA32_MC0_MISC+8:
1582 case MSR_IA32_MC0_MISC+12:
1583 case MSR_IA32_MC0_MISC+16:
1584 case MSR_IA32_UCODE_REV:
a8d13ea2 1585 case MSR_IA32_PERF_STATUS:
2dc7094b 1586 case MSR_IA32_EBL_CR_POWERON:
3bab1f5d
AK		 1587 /* MTRR registers */
1588 case 0xfe:
1589 case 0x200 ... 0x2ff:
1590 data = 0;
1591 break;
a8d13ea2
AK		 1592 case 0xcd: /* fsb frequency */
1593 data = 3;
1594 break;
3bab1f5d
AK		 1595 case MSR_IA32_APICBASE:
1596 data = vcpu->apic_base;
1597 break;
6f00e68f
AK		 1598 case MSR_IA32_MISC_ENABLE:
1599 data = vcpu->ia32_misc_enable_msr;
1600 break;
3bab1f5d
AK		 1601#ifdef CONFIG_X86_64
1602 case MSR_EFER:
1603 data = vcpu->shadow_efer;
1604 break;
1605#endif
1606 default:
1607 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1608 return 1;
1609 }
1610 *pdata = data;
1611 return 0;
1612}
1613EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1614
6aa8b732
AK		 1615/*
1616 * Reads an msr value (of 'msr_index') into 'pdata'.
1617 * Returns 0 on success, non-0 otherwise.
1618 * Assumes vcpu_load() was already called.
1619 */
1620static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1621{
1622 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1623}
1624
05b3e0c2 1625#ifdef CONFIG_X86_64
6aa8b732 1626
3bab1f5d 1627static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1628{
6aa8b732
AK		 1629 if (efer & EFER_RESERVED_BITS) {
1630 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1631 efer);
1632 inject_gp(vcpu);
1633 return;
1634 }
1635
1636 if (is_paging(vcpu)
1637 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1638 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1639 inject_gp(vcpu);
1640 return;
1641 }
1642
7725f0ba
AK		 1643 kvm_arch_ops->set_efer(vcpu, efer);
1644
6aa8b732
AK		 1645 efer &= ~EFER_LMA;
1646 efer |= vcpu->shadow_efer & EFER_LMA;
1647
1648 vcpu->shadow_efer = efer;
6aa8b732 1649}
6aa8b732
AK		 1650
1651#endif
1652
3bab1f5d
AK		 1653int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1654{
1655 switch (msr) {
1656#ifdef CONFIG_X86_64
1657 case MSR_EFER:
1658 set_efer(vcpu, data);
1659 break;
1660#endif
1661 case MSR_IA32_MC0_STATUS:
1662 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1663 __FUNCTION__, data);
1664 break;
0e5bf0d0
SK		 1665 case MSR_IA32_MCG_STATUS:
1666 printk(KERN_WARNING "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
1667 __FUNCTION__, data);
1668 break;
3bab1f5d
AK		 1669 case MSR_IA32_UCODE_REV:
1670 case MSR_IA32_UCODE_WRITE:
1671 case 0x200 ... 0x2ff: /* MTRRs */
1672 break;
1673 case MSR_IA32_APICBASE:
1674 vcpu->apic_base = data;
1675 break;
6f00e68f
AK		 1676 case MSR_IA32_MISC_ENABLE:
1677 vcpu->ia32_misc_enable_msr = data;
1678 break;
102d8325
IM		 1679 /*
1680 * This is the 'probe whether the host is KVM' logic:
1681 */
1682 case MSR_KVM_API_MAGIC:
1683 return vcpu_register_para(vcpu, data);
1684
3bab1f5d
AK		 1685 default:
1686 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1687 return 1;
1688 }
1689 return 0;
1690}
1691EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1692
6aa8b732
AK		 1693/*
1694 * Writes msr value into into the appropriate "register".
1695 * Returns 0 on success, non-0 otherwise.
1696 * Assumes vcpu_load() was already called.
1697 */
1698static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1699{
1700 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1701}
1702
1703void kvm_resched(struct kvm_vcpu *vcpu)
1704{
3fca0365
YD		 1705 if (!need_resched())
1706 return;
6aa8b732
AK		 1707 vcpu_put(vcpu);
1708 cond_resched();
bccf2150 1709 vcpu_load(vcpu);
6aa8b732
AK		 1710}
1711EXPORT_SYMBOL_GPL(kvm_resched);
1712
1713void load_msrs(struct vmx_msr_entry *e, int n)
1714{
1715 int i;
1716
1717 for (i = 0; i < n; ++i)
1718 wrmsrl(e[i].index, e[i].data);
1719}
1720EXPORT_SYMBOL_GPL(load_msrs);
1721
1722void save_msrs(struct vmx_msr_entry *e, int n)
1723{
1724 int i;
1725
1726 for (i = 0; i < n; ++i)
1727 rdmsrl(e[i].index, e[i].data);
1728}
1729EXPORT_SYMBOL_GPL(save_msrs);
1730
06465c5a
AK		 1731void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1732{
1733 int i;
1734 u32 function;
1735 struct kvm_cpuid_entry *e, *best;
1736
1737 kvm_arch_ops->cache_regs(vcpu);
1738 function = vcpu->regs[VCPU_REGS_RAX];
1739 vcpu->regs[VCPU_REGS_RAX] = 0;
1740 vcpu->regs[VCPU_REGS_RBX] = 0;
1741 vcpu->regs[VCPU_REGS_RCX] = 0;
1742 vcpu->regs[VCPU_REGS_RDX] = 0;
1743 best = NULL;
1744 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1745 e = &vcpu->cpuid_entries[i];
1746 if (e->function == function) {
1747 best = e;
1748 break;
1749 }
1750 /*
1751 * Both basic or both extended?
1752 */
1753 if (((e->function ^ function) & 0x80000000) == 0)
1754 if (!best || e->function > best->function)
1755 best = e;
1756 }
1757 if (best) {
1758 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1759 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1760 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1761 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1762 }
1763 kvm_arch_ops->decache_regs(vcpu);
1764 kvm_arch_ops->skip_emulated_instruction(vcpu);
1765}
1766EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1767
039576c0 1768static int pio_copy_data(struct kvm_vcpu *vcpu)
46fc1477 1769{
039576c0
AK		 1770 void *p = vcpu->pio_data;
1771 void *q;
1772 unsigned bytes;
1773 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1774
1775 kvm_arch_ops->vcpu_put(vcpu);
1776 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1777 PAGE_KERNEL);
1778 if (!q) {
1779 kvm_arch_ops->vcpu_load(vcpu);
1780 free_pio_guest_pages(vcpu);
1781 return -ENOMEM;
1782 }
1783 q += vcpu->pio.guest_page_offset;
1784 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1785 if (vcpu->pio.in)
1786 memcpy(q, p, bytes);
1787 else
1788 memcpy(p, q, bytes);
1789 q -= vcpu->pio.guest_page_offset;
1790 vunmap(q);
1791 kvm_arch_ops->vcpu_load(vcpu);
1792 free_pio_guest_pages(vcpu);
1793 return 0;
1794}
1795
1796static int complete_pio(struct kvm_vcpu *vcpu)
1797{
1798 struct kvm_pio_request *io = &vcpu->pio;
46fc1477 1799 long delta;
039576c0 1800 int r;
46fc1477
AK		 1801
1802 kvm_arch_ops->cache_regs(vcpu);
1803
1804 if (!io->string) {
039576c0
AK		 1805 if (io->in)
1806 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
46fc1477
AK		 1807 io->size);
1808 } else {
039576c0
AK		 1809 if (io->in) {
1810 r = pio_copy_data(vcpu);
1811 if (r) {
1812 kvm_arch_ops->cache_regs(vcpu);
1813 return r;
1814 }
1815 }
1816
46fc1477
AK		 1817 delta = 1;
1818 if (io->rep) {
039576c0 1819 delta *= io->cur_count;
46fc1477
AK		 1820 /*
1821 * The size of the register should really depend on
1822 * current address size.
1823 */
1824 vcpu->regs[VCPU_REGS_RCX] -= delta;
1825 }
039576c0 1826 if (io->down)
46fc1477
AK		 1827 delta = -delta;
1828 delta *= io->size;
039576c0 1829 if (io->in)
46fc1477
AK		 1830 vcpu->regs[VCPU_REGS_RDI] += delta;
1831 else
1832 vcpu->regs[VCPU_REGS_RSI] += delta;
1833 }
1834
46fc1477
AK		 1835 kvm_arch_ops->decache_regs(vcpu);
1836
039576c0
AK		 1837 io->count -= io->cur_count;
1838 io->cur_count = 0;
1839
1840 if (!io->count)
1841 kvm_arch_ops->skip_emulated_instruction(vcpu);
1842 return 0;
46fc1477
AK		 1843}
1844
74906345
ED		 1845void kernel_pio(struct kvm_io_device *pio_dev, struct kvm_vcpu *vcpu)
1846{
1847 /* TODO: String I/O for in kernel device */
1848
1849 if (vcpu->pio.in)
1850 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1851 vcpu->pio.size,
1852 vcpu->pio_data);
1853 else
1854 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1855 vcpu->pio.size,
1856 vcpu->pio_data);
1857}
1858
039576c0
AK		 1859int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1860 int size, unsigned long count, int string, int down,
1861 gva_t address, int rep, unsigned port)
1862{
1863 unsigned now, in_page;
1864 int i;
1865 int nr_pages = 1;
1866 struct page *page;
74906345 1867 struct kvm_io_device *pio_dev;
039576c0
AK		 1868
1869 vcpu->run->exit_reason = KVM_EXIT_IO;
1870 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1871 vcpu->run->io.size = size;
1872 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1873 vcpu->run->io.count = count;
1874 vcpu->run->io.port = port;
1875 vcpu->pio.count = count;
1876 vcpu->pio.cur_count = count;
1877 vcpu->pio.size = size;
1878 vcpu->pio.in = in;
74906345 1879 vcpu->pio.port = port;
039576c0
AK		 1880 vcpu->pio.string = string;
1881 vcpu->pio.down = down;
1882 vcpu->pio.guest_page_offset = offset_in_page(address);
1883 vcpu->pio.rep = rep;
1884
74906345 1885 pio_dev = vcpu_find_pio_dev(vcpu, port);
039576c0
AK		 1886 if (!string) {
1887 kvm_arch_ops->cache_regs(vcpu);
1888 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1889 kvm_arch_ops->decache_regs(vcpu);
74906345
ED		 1890 if (pio_dev) {
1891 kernel_pio(pio_dev, vcpu);
1892 complete_pio(vcpu);
1893 return 1;
1894 }
039576c0
AK		 1895 return 0;
1896 }
74906345
ED		 1897 /* TODO: String I/O for in kernel device */
1898 if (pio_dev)
1899 printk(KERN_ERR "kvm_setup_pio: no string io support\n");
039576c0
AK		 1900
1901 if (!count) {
1902 kvm_arch_ops->skip_emulated_instruction(vcpu);
1903 return 1;
1904 }
1905
1906 now = min(count, PAGE_SIZE / size);
1907
1908 if (!down)
1909 in_page = PAGE_SIZE - offset_in_page(address);
1910 else
1911 in_page = offset_in_page(address) + size;
1912 now = min(count, (unsigned long)in_page / size);
1913 if (!now) {
1914 /*
1915 * String I/O straddles page boundary. Pin two guest pages
1916 * so that we satisfy atomicity constraints. Do just one
1917 * transaction to avoid complexity.
1918 */
1919 nr_pages = 2;
1920 now = 1;
1921 }
1922 if (down) {
1923 /*
1924 * String I/O in reverse. Yuck. Kill the guest, fix later.
1925 */
1926 printk(KERN_ERR "kvm: guest string pio down\n");
1927 inject_gp(vcpu);
1928 return 1;
1929 }
1930 vcpu->run->io.count = now;
1931 vcpu->pio.cur_count = now;
1932
1933 for (i = 0; i < nr_pages; ++i) {
1934 spin_lock(&vcpu->kvm->lock);
1935 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1936 if (page)
1937 get_page(page);
1938 vcpu->pio.guest_pages[i] = page;
1939 spin_unlock(&vcpu->kvm->lock);
1940 if (!page) {
1941 inject_gp(vcpu);
1942 free_pio_guest_pages(vcpu);
1943 return 1;
1944 }
1945 }
1946
1947 if (!vcpu->pio.in)
1948 return pio_copy_data(vcpu);
1949 return 0;
1950}
1951EXPORT_SYMBOL_GPL(kvm_setup_pio);
1952
bccf2150 1953static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
6aa8b732 1954{
6aa8b732 1955 int r;
1961d276 1956 sigset_t sigsaved;
6aa8b732 1957
bccf2150 1958 vcpu_load(vcpu);
6aa8b732 1959
1961d276
AK		 1960 if (vcpu->sigset_active)
1961 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
1962
54810342
DL		 1963 /* re-sync apic's tpr */
1964 vcpu->cr8 = kvm_run->cr8;
1965
02c83209
AK		 1966 if (vcpu->pio.cur_count) {
1967 r = complete_pio(vcpu);
1968 if (r)
1969 goto out;
1970 }
1971
1972 if (vcpu->mmio_needed) {
1973 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1974 vcpu->mmio_read_completed = 1;
1975 vcpu->mmio_needed = 0;
1976 r = emulate_instruction(vcpu, kvm_run,
1977 vcpu->mmio_fault_cr2, 0);
1978 if (r == EMULATE_DO_MMIO) {
1979 /*
1980 * Read-modify-write. Back to userspace.
1981 */
1982 kvm_run->exit_reason = KVM_EXIT_MMIO;
1983 r = 0;
1984 goto out;
46fc1477 1985 }
6aa8b732
AK		 1986 }
1987
8eb7d334 1988 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
b4e63f56
AK		 1989 kvm_arch_ops->cache_regs(vcpu);
1990 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
1991 kvm_arch_ops->decache_regs(vcpu);
1992 }
1993
6aa8b732
AK		 1994 r = kvm_arch_ops->run(vcpu, kvm_run);
1995
039576c0 1996out:
1961d276
AK		 1997 if (vcpu->sigset_active)
1998 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1999
6aa8b732
AK		 2000 vcpu_put(vcpu);
2001 return r;
2002}
2003
bccf2150
AK		 2004static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
2005 struct kvm_regs *regs)
6aa8b732 2006{
bccf2150 2007 vcpu_load(vcpu);
6aa8b732
AK		 2008
2009 kvm_arch_ops->cache_regs(vcpu);
2010
2011 regs->rax = vcpu->regs[VCPU_REGS_RAX];
2012 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
2013 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
2014 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
2015 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
2016 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
2017 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
2018 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 2019#ifdef CONFIG_X86_64
6aa8b732
AK		 2020 regs->r8 = vcpu->regs[VCPU_REGS_R8];
2021 regs->r9 = vcpu->regs[VCPU_REGS_R9];
2022 regs->r10 = vcpu->regs[VCPU_REGS_R10];
2023 regs->r11 = vcpu->regs[VCPU_REGS_R11];
2024 regs->r12 = vcpu->regs[VCPU_REGS_R12];
2025 regs->r13 = vcpu->regs[VCPU_REGS_R13];
2026 regs->r14 = vcpu->regs[VCPU_REGS_R14];
2027 regs->r15 = vcpu->regs[VCPU_REGS_R15];
2028#endif
2029
2030 regs->rip = vcpu->rip;
2031 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
2032
2033 /*
2034 * Don't leak debug flags in case they were set for guest debugging
2035 */
2036 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
2037 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
2038
2039 vcpu_put(vcpu);
2040
2041 return 0;
2042}
2043
bccf2150
AK		 2044static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
2045 struct kvm_regs *regs)
6aa8b732 2046{
bccf2150 2047 vcpu_load(vcpu);
6aa8b732
AK		 2048
2049 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
2050 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
2051 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
2052 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
2053 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
2054 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
2055 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
2056 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 2057#ifdef CONFIG_X86_64
6aa8b732
AK		 2058 vcpu->regs[VCPU_REGS_R8] = regs->r8;
2059 vcpu->regs[VCPU_REGS_R9] = regs->r9;
2060 vcpu->regs[VCPU_REGS_R10] = regs->r10;
2061 vcpu->regs[VCPU_REGS_R11] = regs->r11;
2062 vcpu->regs[VCPU_REGS_R12] = regs->r12;
2063 vcpu->regs[VCPU_REGS_R13] = regs->r13;
2064 vcpu->regs[VCPU_REGS_R14] = regs->r14;
2065 vcpu->regs[VCPU_REGS_R15] = regs->r15;
2066#endif
2067
2068 vcpu->rip = regs->rip;
2069 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
2070
2071 kvm_arch_ops->decache_regs(vcpu);
2072
2073 vcpu_put(vcpu);
2074
2075 return 0;
2076}
2077
2078static void get_segment(struct kvm_vcpu *vcpu,
2079 struct kvm_segment *var, int seg)
2080{
2081 return kvm_arch_ops->get_segment(vcpu, var, seg);
2082}
2083
bccf2150
AK		 2084static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2085 struct kvm_sregs *sregs)
6aa8b732 2086{
6aa8b732
AK		 2087 struct descriptor_table dt;
2088
bccf2150 2089 vcpu_load(vcpu);
6aa8b732
AK		 2090
2091 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2092 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2093 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2094 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2095 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2096 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2097
2098 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2099 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2100
2101 kvm_arch_ops->get_idt(vcpu, &dt);
2102 sregs->idt.limit = dt.limit;
2103 sregs->idt.base = dt.base;
2104 kvm_arch_ops->get_gdt(vcpu, &dt);
2105 sregs->gdt.limit = dt.limit;
2106 sregs->gdt.base = dt.base;
2107
25c4c276 2108 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
6aa8b732
AK		 2109 sregs->cr0 = vcpu->cr0;
2110 sregs->cr2 = vcpu->cr2;
2111 sregs->cr3 = vcpu->cr3;
2112 sregs->cr4 = vcpu->cr4;
2113 sregs->cr8 = vcpu->cr8;
2114 sregs->efer = vcpu->shadow_efer;
2115 sregs->apic_base = vcpu->apic_base;
2116
2117 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2118 sizeof sregs->interrupt_bitmap);
2119
2120 vcpu_put(vcpu);
2121
2122 return 0;
2123}
2124
2125static void set_segment(struct kvm_vcpu *vcpu,
2126 struct kvm_segment *var, int seg)
2127{
2128 return kvm_arch_ops->set_segment(vcpu, var, seg);
2129}
2130
bccf2150
AK		 2131static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2132 struct kvm_sregs *sregs)
6aa8b732 2133{
6aa8b732
AK		 2134 int mmu_reset_needed = 0;
2135 int i;
2136 struct descriptor_table dt;
2137
bccf2150 2138 vcpu_load(vcpu);
6aa8b732 2139
6aa8b732
AK		 2140 dt.limit = sregs->idt.limit;
2141 dt.base = sregs->idt.base;
2142 kvm_arch_ops->set_idt(vcpu, &dt);
2143 dt.limit = sregs->gdt.limit;
2144 dt.base = sregs->gdt.base;
2145 kvm_arch_ops->set_gdt(vcpu, &dt);
2146
2147 vcpu->cr2 = sregs->cr2;
2148 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2149 vcpu->cr3 = sregs->cr3;
2150
2151 vcpu->cr8 = sregs->cr8;
2152
2153 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 2154#ifdef CONFIG_X86_64
6aa8b732
AK		 2155 kvm_arch_ops->set_efer(vcpu, sregs->efer);
2156#endif
2157 vcpu->apic_base = sregs->apic_base;
2158
25c4c276 2159 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
399badf3 2160
6aa8b732 2161 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
f6528b03 2162 kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
6aa8b732
AK		 2163
2164 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2165 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 2166 if (!is_long_mode(vcpu) && is_pae(vcpu))
2167 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 2168
2169 if (mmu_reset_needed)
2170 kvm_mmu_reset_context(vcpu);
2171
2172 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2173 sizeof vcpu->irq_pending);
2174 vcpu->irq_summary = 0;
2175 for (i = 0; i < NR_IRQ_WORDS; ++i)
2176 if (vcpu->irq_pending[i])
2177 __set_bit(i, &vcpu->irq_summary);
2178
024aa1c0
AK		 2179 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2180 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2181 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2182 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2183 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2184 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2185
2186 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2187 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2188
6aa8b732
AK		 2189 vcpu_put(vcpu);
2190
2191 return 0;
2192}
2193
2194/*
2195 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2196 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 2197 *
2198 * This list is modified at module load time to reflect the
2199 * capabilities of the host cpu.
6aa8b732
AK		 2200 */
2201static u32 msrs_to_save[] = {
2202 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2203 MSR_K6_STAR,
05b3e0c2 2204#ifdef CONFIG_X86_64
6aa8b732
AK		 2205 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2206#endif
2207 MSR_IA32_TIME_STAMP_COUNTER,
2208};
2209
bf591b24
MR		 2210static unsigned num_msrs_to_save;
2211
6f00e68f
AK		 2212static u32 emulated_msrs[] = {
2213 MSR_IA32_MISC_ENABLE,
2214};
2215
bf591b24
MR		 2216static __init void kvm_init_msr_list(void)
2217{
2218 u32 dummy[2];
2219 unsigned i, j;
2220
2221 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2222 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2223 continue;
2224 if (j < i)
2225 msrs_to_save[j] = msrs_to_save[i];
2226 j++;
2227 }
2228 num_msrs_to_save = j;
2229}
6aa8b732
AK		 2230
2231/*
2232 * Adapt set_msr() to msr_io()'s calling convention
2233 */
2234static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2235{
2236 return set_msr(vcpu, index, *data);
2237}
2238
2239/*
2240 * Read or write a bunch of msrs. All parameters are kernel addresses.
2241 *
2242 * @return number of msrs set successfully.
2243 */
bccf2150 2244static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
6aa8b732
AK		 2245 struct kvm_msr_entry *entries,
2246 int (*do_msr)(struct kvm_vcpu *vcpu,
2247 unsigned index, u64 *data))
2248{
6aa8b732
AK		 2249 int i;
2250
bccf2150 2251 vcpu_load(vcpu);
6aa8b732
AK		 2252
2253 for (i = 0; i < msrs->nmsrs; ++i)
2254 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2255 break;
2256
2257 vcpu_put(vcpu);
2258
2259 return i;
2260}
2261
2262/*
2263 * Read or write a bunch of msrs. Parameters are user addresses.
2264 *
2265 * @return number of msrs set successfully.
2266 */
bccf2150 2267static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
6aa8b732
AK		 2268 int (*do_msr)(struct kvm_vcpu *vcpu,
2269 unsigned index, u64 *data),
2270 int writeback)
2271{
2272 struct kvm_msrs msrs;
2273 struct kvm_msr_entry *entries;
2274 int r, n;
2275 unsigned size;
2276
2277 r = -EFAULT;
2278 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2279 goto out;
2280
2281 r = -E2BIG;
2282 if (msrs.nmsrs >= MAX_IO_MSRS)
2283 goto out;
2284
2285 r = -ENOMEM;
2286 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2287 entries = vmalloc(size);
2288 if (!entries)
2289 goto out;
2290
2291 r = -EFAULT;
2292 if (copy_from_user(entries, user_msrs->entries, size))
2293 goto out_free;
2294
bccf2150 2295 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
6aa8b732
AK		 2296 if (r < 0)
2297 goto out_free;
2298
2299 r = -EFAULT;
2300 if (writeback && copy_to_user(user_msrs->entries, entries, size))
2301 goto out_free;
2302
2303 r = n;
2304
2305out_free:
2306 vfree(entries);
2307out:
2308 return r;
2309}
2310
2311/*
2312 * Translate a guest virtual address to a guest physical address.
2313 */
bccf2150
AK		 2314static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2315 struct kvm_translation *tr)
6aa8b732
AK		 2316{
2317 unsigned long vaddr = tr->linear_address;
6aa8b732
AK		 2318 gpa_t gpa;
2319
bccf2150
AK		 2320 vcpu_load(vcpu);
2321 spin_lock(&vcpu->kvm->lock);
6aa8b732
AK		 2322 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2323 tr->physical_address = gpa;
2324 tr->valid = gpa != UNMAPPED_GVA;
2325 tr->writeable = 1;
2326 tr->usermode = 0;
bccf2150 2327 spin_unlock(&vcpu->kvm->lock);
6aa8b732
AK		 2328 vcpu_put(vcpu);
2329
2330 return 0;
2331}
2332
bccf2150
AK		 2333static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2334 struct kvm_interrupt *irq)
6aa8b732 2335{
6aa8b732
AK		 2336 if (irq->irq < 0 || irq->irq >= 256)
2337 return -EINVAL;
bccf2150 2338 vcpu_load(vcpu);
6aa8b732
AK		 2339
2340 set_bit(irq->irq, vcpu->irq_pending);
2341 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2342
2343 vcpu_put(vcpu);
2344
2345 return 0;
2346}
2347
bccf2150
AK		 2348static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2349 struct kvm_debug_guest *dbg)
6aa8b732 2350{
6aa8b732
AK		 2351 int r;
2352
bccf2150 2353 vcpu_load(vcpu);
6aa8b732
AK		 2354
2355 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
2356
2357 vcpu_put(vcpu);
2358
2359 return r;
2360}
2361
9a2bb7f4
AK		 2362static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2363 unsigned long address,
2364 int *type)
2365{
2366 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2367 unsigned long pgoff;
2368 struct page *page;
2369
2370 *type = VM_FAULT_MINOR;
2371 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
039576c0
AK		 2372 if (pgoff == 0)
2373 page = virt_to_page(vcpu->run);
2374 else if (pgoff == KVM_PIO_PAGE_OFFSET)
2375 page = virt_to_page(vcpu->pio_data);
2376 else
9a2bb7f4 2377 return NOPAGE_SIGBUS;
9a2bb7f4
AK		 2378 get_page(page);
2379 return page;
2380}
2381
2382static struct vm_operations_struct kvm_vcpu_vm_ops = {
2383 .nopage = kvm_vcpu_nopage,
2384};
2385
2386static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2387{
2388 vma->vm_ops = &kvm_vcpu_vm_ops;
2389 return 0;
2390}
2391
bccf2150
AK		 2392static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2393{
2394 struct kvm_vcpu *vcpu = filp->private_data;
2395
2396 fput(vcpu->kvm->filp);
2397 return 0;
2398}
2399
2400static struct file_operations kvm_vcpu_fops = {
2401 .release = kvm_vcpu_release,
2402 .unlocked_ioctl = kvm_vcpu_ioctl,
2403 .compat_ioctl = kvm_vcpu_ioctl,
9a2bb7f4 2404 .mmap = kvm_vcpu_mmap,
bccf2150
AK		 2405};
2406
2407/*
2408 * Allocates an inode for the vcpu.
2409 */
2410static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2411{
2412 int fd, r;
2413 struct inode *inode;
2414 struct file *file;
2415
2416 atomic_inc(&vcpu->kvm->filp->f_count);
2417 inode = kvmfs_inode(&kvm_vcpu_fops);
2418 if (IS_ERR(inode)) {
2419 r = PTR_ERR(inode);
2420 goto out1;
2421 }
2422
2423 file = kvmfs_file(inode, vcpu);
2424 if (IS_ERR(file)) {
2425 r = PTR_ERR(file);
2426 goto out2;
2427 }
2428
2429 r = get_unused_fd();
2430 if (r < 0)
2431 goto out3;
2432 fd = r;
2433 fd_install(fd, file);
2434
2435 return fd;
2436
2437out3:
2438 fput(file);
2439out2:
2440 iput(inode);
2441out1:
2442 fput(vcpu->kvm->filp);
2443 return r;
2444}
2445
c5ea7660
AK		 2446/*
2447 * Creates some virtual cpus. Good luck creating more than one.
2448 */
2449static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2450{
2451 int r;
2452 struct kvm_vcpu *vcpu;
9a2bb7f4 2453 struct page *page;
c5ea7660
AK		 2454
2455 r = -EINVAL;
2456 if (!valid_vcpu(n))
2457 goto out;
2458
2459 vcpu = &kvm->vcpus[n];
2460
2461 mutex_lock(&vcpu->mutex);
2462
2463 if (vcpu->vmcs) {
2464 mutex_unlock(&vcpu->mutex);
2465 return -EEXIST;
2466 }
2467
9a2bb7f4
AK		 2468 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2469 r = -ENOMEM;
2470 if (!page)
2471 goto out_unlock;
2472 vcpu->run = page_address(page);
2473
039576c0
AK		 2474 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2475 r = -ENOMEM;
2476 if (!page)
2477 goto out_free_run;
2478 vcpu->pio_data = page_address(page);
2479
c5ea7660
AK		 2480 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
2481 FX_IMAGE_ALIGN);
2482 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
d917a6b9 2483 vcpu->cr0 = 0x10;
c5ea7660
AK		 2484
2485 r = kvm_arch_ops->vcpu_create(vcpu);
2486 if (r < 0)
2487 goto out_free_vcpus;
2488
2489 r = kvm_mmu_create(vcpu);
2490 if (r < 0)
2491 goto out_free_vcpus;
2492
2493 kvm_arch_ops->vcpu_load(vcpu);
2494 r = kvm_mmu_setup(vcpu);
2495 if (r >= 0)
2496 r = kvm_arch_ops->vcpu_setup(vcpu);
2497 vcpu_put(vcpu);
2498
2499 if (r < 0)
2500 goto out_free_vcpus;
2501
bccf2150
AK		 2502 r = create_vcpu_fd(vcpu);
2503 if (r < 0)
2504 goto out_free_vcpus;
2505
39c3b86e
AK		 2506 spin_lock(&kvm_lock);
2507 if (n >= kvm->nvcpus)
2508 kvm->nvcpus = n + 1;
2509 spin_unlock(&kvm_lock);
2510
bccf2150 2511 return r;
c5ea7660
AK		 2512
2513out_free_vcpus:
2514 kvm_free_vcpu(vcpu);
039576c0
AK		 2515out_free_run:
2516 free_page((unsigned long)vcpu->run);
2517 vcpu->run = NULL;
9a2bb7f4 2518out_unlock:
c5ea7660
AK		 2519 mutex_unlock(&vcpu->mutex);
2520out:
2521 return r;
2522}
2523
2cc51560
ED		 2524static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2525{
2526 u64 efer;
2527 int i;
2528 struct kvm_cpuid_entry *e, *entry;
2529
2530 rdmsrl(MSR_EFER, efer);
2531 entry = NULL;
2532 for (i = 0; i < vcpu->cpuid_nent; ++i) {
2533 e = &vcpu->cpuid_entries[i];
2534 if (e->function == 0x80000001) {
2535 entry = e;
2536 break;
2537 }
2538 }
2539 if (entry && (entry->edx & EFER_NX) && !(efer & EFER_NX)) {
2540 entry->edx &= ~(1 << 20);
2541 printk(KERN_INFO ": guest NX capability removed\n");
2542 }
2543}
2544
06465c5a
AK		 2545static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2546 struct kvm_cpuid *cpuid,
2547 struct kvm_cpuid_entry __user *entries)
2548{
2549 int r;
2550
2551 r = -E2BIG;
2552 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2553 goto out;
2554 r = -EFAULT;
2555 if (copy_from_user(&vcpu->cpuid_entries, entries,
2556 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2557 goto out;
2558 vcpu->cpuid_nent = cpuid->nent;
2cc51560 2559 cpuid_fix_nx_cap(vcpu);
06465c5a
AK		 2560 return 0;
2561
2562out:
2563 return r;
2564}
2565
1961d276
AK		 2566static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2567{
2568 if (sigset) {
2569 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2570 vcpu->sigset_active = 1;
2571 vcpu->sigset = *sigset;
2572 } else
2573 vcpu->sigset_active = 0;
2574 return 0;
2575}
2576
b8836737
AK		 2577/*
2578 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2579 * we have asm/x86/processor.h
2580 */
2581struct fxsave {
2582 u16 cwd;
2583 u16 swd;
2584 u16 twd;
2585 u16 fop;
2586 u64 rip;
2587 u64 rdp;
2588 u32 mxcsr;
2589 u32 mxcsr_mask;
2590 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2591#ifdef CONFIG_X86_64
2592 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2593#else
2594 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2595#endif
2596};
2597
2598static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2599{
2600 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2601
2602 vcpu_load(vcpu);
2603
2604 memcpy(fpu->fpr, fxsave->st_space, 128);
2605 fpu->fcw = fxsave->cwd;
2606 fpu->fsw = fxsave->swd;
2607 fpu->ftwx = fxsave->twd;
2608 fpu->last_opcode = fxsave->fop;
2609 fpu->last_ip = fxsave->rip;
2610 fpu->last_dp = fxsave->rdp;
2611 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2612
2613 vcpu_put(vcpu);
2614
2615 return 0;
2616}
2617
2618static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2619{
2620 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2621
2622 vcpu_load(vcpu);
2623
2624 memcpy(fxsave->st_space, fpu->fpr, 128);
2625 fxsave->cwd = fpu->fcw;
2626 fxsave->swd = fpu->fsw;
2627 fxsave->twd = fpu->ftwx;
2628 fxsave->fop = fpu->last_opcode;
2629 fxsave->rip = fpu->last_ip;
2630 fxsave->rdp = fpu->last_dp;
2631 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2632
2633 vcpu_put(vcpu);
2634
2635 return 0;
2636}
2637
bccf2150
AK		 2638static long kvm_vcpu_ioctl(struct file *filp,
2639 unsigned int ioctl, unsigned long arg)
6aa8b732 2640{
bccf2150 2641 struct kvm_vcpu *vcpu = filp->private_data;
2f366987 2642 void __user *argp = (void __user *)arg;
6aa8b732
AK		 2643 int r = -EINVAL;
2644
2645 switch (ioctl) {
9a2bb7f4 2646 case KVM_RUN:
f0fe5108
AK		 2647 r = -EINVAL;
2648 if (arg)
2649 goto out;
9a2bb7f4 2650 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
6aa8b732 2651 break;
6aa8b732
AK		 2652 case KVM_GET_REGS: {
2653 struct kvm_regs kvm_regs;
2654
bccf2150
AK		 2655 memset(&kvm_regs, 0, sizeof kvm_regs);
2656 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2657 if (r)
2658 goto out;
2659 r = -EFAULT;
2f366987 2660 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 2661 goto out;
2662 r = 0;
2663 break;
2664 }
2665 case KVM_SET_REGS: {
2666 struct kvm_regs kvm_regs;
2667
2668 r = -EFAULT;
2f366987 2669 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732 2670 goto out;
bccf2150 2671 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
6aa8b732
AK		 2672 if (r)
2673 goto out;
2674 r = 0;
2675 break;
2676 }
2677 case KVM_GET_SREGS: {
2678 struct kvm_sregs kvm_sregs;
2679
bccf2150
AK		 2680 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2681 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2682 if (r)
2683 goto out;
2684 r = -EFAULT;
2f366987 2685 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 2686 goto out;
2687 r = 0;
2688 break;
2689 }
2690 case KVM_SET_SREGS: {
2691 struct kvm_sregs kvm_sregs;
2692
2693 r = -EFAULT;
2f366987 2694 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732 2695 goto out;
bccf2150 2696 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
6aa8b732
AK		 2697 if (r)
2698 goto out;
2699 r = 0;
2700 break;
2701 }
2702 case KVM_TRANSLATE: {
2703 struct kvm_translation tr;
2704
2705 r = -EFAULT;
2f366987 2706 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732 2707 goto out;
bccf2150 2708 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
6aa8b732
AK		 2709 if (r)
2710 goto out;
2711 r = -EFAULT;
2f366987 2712 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 2713 goto out;
2714 r = 0;
2715 break;
2716 }
2717 case KVM_INTERRUPT: {
2718 struct kvm_interrupt irq;
2719
2720 r = -EFAULT;
2f366987 2721 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732 2722 goto out;
bccf2150 2723 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
6aa8b732
AK		 2724 if (r)
2725 goto out;
2726 r = 0;
2727 break;
2728 }
2729 case KVM_DEBUG_GUEST: {
2730 struct kvm_debug_guest dbg;
2731
2732 r = -EFAULT;
2f366987 2733 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732 2734 goto out;
bccf2150 2735 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
6aa8b732
AK		 2736 if (r)
2737 goto out;
2738 r = 0;
2739 break;
2740 }
bccf2150
AK		 2741 case KVM_GET_MSRS:
2742 r = msr_io(vcpu, argp, get_msr, 1);
2743 break;
2744 case KVM_SET_MSRS:
2745 r = msr_io(vcpu, argp, do_set_msr, 0);
2746 break;
06465c5a
AK		 2747 case KVM_SET_CPUID: {
2748 struct kvm_cpuid __user *cpuid_arg = argp;
2749 struct kvm_cpuid cpuid;
2750
2751 r = -EFAULT;
2752 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2753 goto out;
2754 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2755 if (r)
2756 goto out;
2757 break;
2758 }
1961d276
AK		 2759 case KVM_SET_SIGNAL_MASK: {
2760 struct kvm_signal_mask __user *sigmask_arg = argp;
2761 struct kvm_signal_mask kvm_sigmask;
2762 sigset_t sigset, *p;
2763
2764 p = NULL;
2765 if (argp) {
2766 r = -EFAULT;
2767 if (copy_from_user(&kvm_sigmask, argp,
2768 sizeof kvm_sigmask))
2769 goto out;
2770 r = -EINVAL;
2771 if (kvm_sigmask.len != sizeof sigset)
2772 goto out;
2773 r = -EFAULT;
2774 if (copy_from_user(&sigset, sigmask_arg->sigset,
2775 sizeof sigset))
2776 goto out;
2777 p = &sigset;
2778 }
2779 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2780 break;
2781 }
b8836737
AK		 2782 case KVM_GET_FPU: {
2783 struct kvm_fpu fpu;
2784
2785 memset(&fpu, 0, sizeof fpu);
2786 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
2787 if (r)
2788 goto out;
2789 r = -EFAULT;
2790 if (copy_to_user(argp, &fpu, sizeof fpu))
2791 goto out;
2792 r = 0;
2793 break;
2794 }
2795 case KVM_SET_FPU: {
2796 struct kvm_fpu fpu;
2797
2798 r = -EFAULT;
2799 if (copy_from_user(&fpu, argp, sizeof fpu))
2800 goto out;
2801 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
2802 if (r)
2803 goto out;
2804 r = 0;
2805 break;
2806 }
bccf2150
AK		 2807 default:
2808 ;
2809 }
2810out:
2811 return r;
2812}
2813
2814static long kvm_vm_ioctl(struct file *filp,
2815 unsigned int ioctl, unsigned long arg)
2816{
2817 struct kvm *kvm = filp->private_data;
2818 void __user *argp = (void __user *)arg;
2819 int r = -EINVAL;
2820
2821 switch (ioctl) {
2822 case KVM_CREATE_VCPU:
2823 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2824 if (r < 0)
2825 goto out;
2826 break;
6aa8b732
AK		 2827 case KVM_SET_MEMORY_REGION: {
2828 struct kvm_memory_region kvm_mem;
2829
2830 r = -EFAULT;
2f366987 2831 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
6aa8b732 2832 goto out;
2c6f5df9 2833 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
6aa8b732
AK		 2834 if (r)
2835 goto out;
2836 break;
2837 }
2838 case KVM_GET_DIRTY_LOG: {
2839 struct kvm_dirty_log log;
2840
2841 r = -EFAULT;
2f366987 2842 if (copy_from_user(&log, argp, sizeof log))
6aa8b732 2843 goto out;
2c6f5df9 2844 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
6aa8b732
AK		 2845 if (r)
2846 goto out;
2847 break;
2848 }
e8207547
AK		 2849 case KVM_SET_MEMORY_ALIAS: {
2850 struct kvm_memory_alias alias;
2851
2852 r = -EFAULT;
2853 if (copy_from_user(&alias, argp, sizeof alias))
2854 goto out;
2855 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
2856 if (r)
2857 goto out;
2858 break;
2859 }
f17abe9a
AK		 2860 default:
2861 ;
2862 }
2863out:
2864 return r;
2865}
2866
2867static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2868 unsigned long address,
2869 int *type)
2870{
2871 struct kvm *kvm = vma->vm_file->private_data;
2872 unsigned long pgoff;
f17abe9a
AK		 2873 struct page *page;
2874
2875 *type = VM_FAULT_MINOR;
2876 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
954bbbc2 2877 page = gfn_to_page(kvm, pgoff);
f17abe9a
AK		 2878 if (!page)
2879 return NOPAGE_SIGBUS;
2880 get_page(page);
2881 return page;
2882}
2883
2884static struct vm_operations_struct kvm_vm_vm_ops = {
2885 .nopage = kvm_vm_nopage,
2886};
2887
2888static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2889{
2890 vma->vm_ops = &kvm_vm_vm_ops;
2891 return 0;
2892}
2893
2894static struct file_operations kvm_vm_fops = {
2895 .release = kvm_vm_release,
2896 .unlocked_ioctl = kvm_vm_ioctl,
2897 .compat_ioctl = kvm_vm_ioctl,
2898 .mmap = kvm_vm_mmap,
2899};
2900
2901static int kvm_dev_ioctl_create_vm(void)
2902{
2903 int fd, r;
2904 struct inode *inode;
2905 struct file *file;
2906 struct kvm *kvm;
2907
2908 inode = kvmfs_inode(&kvm_vm_fops);
2909 if (IS_ERR(inode)) {
2910 r = PTR_ERR(inode);
2911 goto out1;
2912 }
2913
2914 kvm = kvm_create_vm();
2915 if (IS_ERR(kvm)) {
2916 r = PTR_ERR(kvm);
2917 goto out2;
2918 }
2919
2920 file = kvmfs_file(inode, kvm);
2921 if (IS_ERR(file)) {
2922 r = PTR_ERR(file);
2923 goto out3;
2924 }
bccf2150 2925 kvm->filp = file;
f17abe9a
AK		 2926
2927 r = get_unused_fd();
2928 if (r < 0)
2929 goto out4;
2930 fd = r;
2931 fd_install(fd, file);
2932
2933 return fd;
2934
2935out4:
2936 fput(file);
2937out3:
2938 kvm_destroy_vm(kvm);
2939out2:
2940 iput(inode);
2941out1:
2942 return r;
2943}
2944
2945static long kvm_dev_ioctl(struct file *filp,
2946 unsigned int ioctl, unsigned long arg)
2947{
2948 void __user *argp = (void __user *)arg;
07c45a36 2949 long r = -EINVAL;
f17abe9a
AK		 2950
2951 switch (ioctl) {
2952 case KVM_GET_API_VERSION:
f0fe5108
AK		 2953 r = -EINVAL;
2954 if (arg)
2955 goto out;
f17abe9a
AK		 2956 r = KVM_API_VERSION;
2957 break;
2958 case KVM_CREATE_VM:
f0fe5108
AK		 2959 r = -EINVAL;
2960 if (arg)
2961 goto out;
f17abe9a
AK		 2962 r = kvm_dev_ioctl_create_vm();
2963 break;
6aa8b732 2964 case KVM_GET_MSR_INDEX_LIST: {
2f366987 2965 struct kvm_msr_list __user *user_msr_list = argp;
6aa8b732
AK		 2966 struct kvm_msr_list msr_list;
2967 unsigned n;
2968
2969 r = -EFAULT;
2970 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2971 goto out;
2972 n = msr_list.nmsrs;
6f00e68f 2973 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
6aa8b732
AK		 2974 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2975 goto out;
2976 r = -E2BIG;
bf591b24 2977 if (n < num_msrs_to_save)
6aa8b732
AK		 2978 goto out;
2979 r = -EFAULT;
2980 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 2981 num_msrs_to_save * sizeof(u32)))
6aa8b732 2982 goto out;
6f00e68f
AK		 2983 if (copy_to_user(user_msr_list->indices
2984 + num_msrs_to_save * sizeof(u32),
2985 &emulated_msrs,
2986 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2987 goto out;
6aa8b732 2988 r = 0;
cc1d8955 2989 break;
6aa8b732 2990 }
5d308f45
AK		 2991 case KVM_CHECK_EXTENSION:
2992 /*
2993 * No extensions defined at present.
2994 */
2995 r = 0;
2996 break;
07c45a36
AK		 2997 case KVM_GET_VCPU_MMAP_SIZE:
2998 r = -EINVAL;
2999 if (arg)
3000 goto out;
039576c0 3001 r = 2 * PAGE_SIZE;
07c45a36 3002 break;
6aa8b732
AK		 3003 default:
3004 ;
3005 }
3006out:
3007 return r;
3008}
3009
6aa8b732
AK		 3010static struct file_operations kvm_chardev_ops = {
3011 .open = kvm_dev_open,
3012 .release = kvm_dev_release,
3013 .unlocked_ioctl = kvm_dev_ioctl,
3014 .compat_ioctl = kvm_dev_ioctl,
6aa8b732
AK		 3015};
3016
3017static struct miscdevice kvm_dev = {
bbe4432e 3018 KVM_MINOR,
6aa8b732
AK		 3019 "kvm",
3020 &kvm_chardev_ops,
3021};
3022
3023static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3024 void *v)
3025{
3026 if (val == SYS_RESTART) {
3027 /*
3028 * Some (well, at least mine) BIOSes hang on reboot if
3029 * in vmx root mode.
3030 */
3031 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
8b6d44c7 3032 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 3033 }
3034 return NOTIFY_OK;
3035}
3036
3037static struct notifier_block kvm_reboot_notifier = {
3038 .notifier_call = kvm_reboot,
3039 .priority = 0,
3040};
3041
774c47f1
AK		 3042/*
3043 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
3044 * cached on it.
3045 */
3046static void decache_vcpus_on_cpu(int cpu)
3047{
3048 struct kvm *vm;
3049 struct kvm_vcpu *vcpu;
3050 int i;
3051
3052 spin_lock(&kvm_lock);
3053 list_for_each_entry(vm, &vm_list, vm_list)
3054 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3055 vcpu = &vm->vcpus[i];
3056 /*
3057 * If the vcpu is locked, then it is running on some
3058 * other cpu and therefore it is not cached on the
3059 * cpu in question.
3060 *
3061 * If it's not locked, check the last cpu it executed
3062 * on.
3063 */
3064 if (mutex_trylock(&vcpu->mutex)) {
3065 if (vcpu->cpu == cpu) {
3066 kvm_arch_ops->vcpu_decache(vcpu);
3067 vcpu->cpu = -1;
3068 }
3069 mutex_unlock(&vcpu->mutex);
3070 }
3071 }
3072 spin_unlock(&kvm_lock);
3073}
3074
3075static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
3076 void *v)
3077{
3078 int cpu = (long)v;
3079
3080 switch (val) {
43934a38 3081 case CPU_DOWN_PREPARE:
8bb78442 3082 case CPU_DOWN_PREPARE_FROZEN:
774c47f1 3083 case CPU_UP_CANCELED:
8bb78442 3084 case CPU_UP_CANCELED_FROZEN:
43934a38
JK		 3085 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
3086 cpu);
774c47f1
AK		 3087 decache_vcpus_on_cpu(cpu);
3088 smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
3089 NULL, 0, 1);
3090 break;
43934a38 3091 case CPU_ONLINE:
8bb78442 3092 case CPU_ONLINE_FROZEN:
43934a38
JK		 3093 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
3094 cpu);
774c47f1
AK		 3095 smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
3096 NULL, 0, 1);
3097 break;
3098 }
3099 return NOTIFY_OK;
3100}
3101
2eeb2e94
GH		 3102void kvm_io_bus_init(struct kvm_io_bus *bus)
3103{
3104 memset(bus, 0, sizeof(*bus));
3105}
3106
3107void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3108{
3109 int i;
3110
3111 for (i = 0; i < bus->dev_count; i++) {
3112 struct kvm_io_device *pos = bus->devs[i];
3113
3114 kvm_iodevice_destructor(pos);
3115 }
3116}
3117
3118struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
3119{
3120 int i;
3121
3122 for (i = 0; i < bus->dev_count; i++) {
3123 struct kvm_io_device *pos = bus->devs[i];
3124
3125 if (pos->in_range(pos, addr))
3126 return pos;
3127 }
3128
3129 return NULL;
3130}
3131
3132void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
3133{
3134 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
3135
3136 bus->devs[bus->dev_count++] = dev;
3137}
3138
774c47f1
AK		 3139static struct notifier_block kvm_cpu_notifier = {
3140 .notifier_call = kvm_cpu_hotplug,
3141 .priority = 20, /* must be > scheduler priority */
3142};
3143
1165f5fe
AK		 3144static u64 stat_get(void *_offset)
3145{
3146 unsigned offset = (long)_offset;
3147 u64 total = 0;
3148 struct kvm *kvm;
3149 struct kvm_vcpu *vcpu;
3150 int i;
3151
3152 spin_lock(&kvm_lock);
3153 list_for_each_entry(kvm, &vm_list, vm_list)
3154 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3155 vcpu = &kvm->vcpus[i];
3156 total += *(u32 *)((void *)vcpu + offset);
3157 }
3158 spin_unlock(&kvm_lock);
3159 return total;
3160}
3161
3162static void stat_set(void *offset, u64 val)
3163{
3164}
3165
3166DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, stat_set, "%llu\n");
3167
6aa8b732
AK		 3168static __init void kvm_init_debug(void)
3169{
3170 struct kvm_stats_debugfs_item *p;
3171
8b6d44c7 3172 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732 3173 for (p = debugfs_entries; p->name; ++p)
1165f5fe
AK		 3174 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
3175 (void *)(long)p->offset,
3176 &stat_fops);
6aa8b732
AK		 3177}
3178
3179static void kvm_exit_debug(void)
3180{
3181 struct kvm_stats_debugfs_item *p;
3182
3183 for (p = debugfs_entries; p->name; ++p)
3184 debugfs_remove(p->dentry);
3185 debugfs_remove(debugfs_dir);
3186}
3187
59ae6c6b
AK		 3188static int kvm_suspend(struct sys_device *dev, pm_message_t state)
3189{
3190 decache_vcpus_on_cpu(raw_smp_processor_id());
19d1408d 3191 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
59ae6c6b
AK		 3192 return 0;
3193}
3194
3195static int kvm_resume(struct sys_device *dev)
3196{
19d1408d 3197 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
59ae6c6b
AK		 3198 return 0;
3199}
3200
3201static struct sysdev_class kvm_sysdev_class = {
3202 set_kset_name("kvm"),
3203 .suspend = kvm_suspend,
3204 .resume = kvm_resume,
3205};
3206
3207static struct sys_device kvm_sysdev = {
3208 .id = 0,
3209 .cls = &kvm_sysdev_class,
3210};
3211
6aa8b732
AK		 3212hpa_t bad_page_address;
3213
37e29d90
AK		 3214static int kvmfs_get_sb(struct file_system_type *fs_type, int flags,
3215 const char *dev_name, void *data, struct vfsmount *mnt)
3216{
e9cdb1e3 3217 return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_SUPER_MAGIC, mnt);
37e29d90
AK		 3218}
3219
3220static struct file_system_type kvm_fs_type = {
3221 .name = "kvmfs",
3222 .get_sb = kvmfs_get_sb,
3223 .kill_sb = kill_anon_super,
3224};
3225
6aa8b732
AK		 3226int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
3227{
3228 int r;
3229
09db28b8
YI		 3230 if (kvm_arch_ops) {
3231 printk(KERN_ERR "kvm: already loaded the other module\n");
3232 return -EEXIST;
3233 }
3234
e097f35c 3235 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 3236 printk(KERN_ERR "kvm: no hardware support\n");
3237 return -EOPNOTSUPP;
3238 }
e097f35c 3239 if (ops->disabled_by_bios()) {
6aa8b732
AK		 3240 printk(KERN_ERR "kvm: disabled by bios\n");
3241 return -EOPNOTSUPP;
3242 }
3243
e097f35c
YI		 3244 kvm_arch_ops = ops;
3245
6aa8b732
AK		 3246 r = kvm_arch_ops->hardware_setup();
3247 if (r < 0)
ca45aaae 3248 goto out;
6aa8b732 3249
8b6d44c7 3250 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
774c47f1
AK		 3251 r = register_cpu_notifier(&kvm_cpu_notifier);
3252 if (r)
3253 goto out_free_1;
6aa8b732
AK		 3254 register_reboot_notifier(&kvm_reboot_notifier);
3255
59ae6c6b
AK		 3256 r = sysdev_class_register(&kvm_sysdev_class);
3257 if (r)
3258 goto out_free_2;
3259
3260 r = sysdev_register(&kvm_sysdev);
3261 if (r)
3262 goto out_free_3;
3263
6aa8b732
AK		 3264 kvm_chardev_ops.owner = module;
3265
3266 r = misc_register(&kvm_dev);
3267 if (r) {
3268 printk (KERN_ERR "kvm: misc device register failed\n");
3269 goto out_free;
3270 }
3271
3272 return r;
3273
3274out_free:
59ae6c6b
AK		 3275 sysdev_unregister(&kvm_sysdev);
3276out_free_3:
3277 sysdev_class_unregister(&kvm_sysdev_class);
3278out_free_2:
6aa8b732 3279 unregister_reboot_notifier(&kvm_reboot_notifier);
774c47f1
AK		 3280 unregister_cpu_notifier(&kvm_cpu_notifier);
3281out_free_1:
8b6d44c7 3282 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 3283 kvm_arch_ops->hardware_unsetup();
ca45aaae
AK		 3284out:
3285 kvm_arch_ops = NULL;
6aa8b732
AK		 3286 return r;
3287}
3288
3289void kvm_exit_arch(void)
3290{
3291 misc_deregister(&kvm_dev);
59ae6c6b
AK		 3292 sysdev_unregister(&kvm_sysdev);
3293 sysdev_class_unregister(&kvm_sysdev_class);
6aa8b732 3294 unregister_reboot_notifier(&kvm_reboot_notifier);
59ae6c6b 3295 unregister_cpu_notifier(&kvm_cpu_notifier);
8b6d44c7 3296 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 3297 kvm_arch_ops->hardware_unsetup();
09db28b8 3298 kvm_arch_ops = NULL;
6aa8b732
AK		 3299}
3300
3301static __init int kvm_init(void)
3302{
3303 static struct page *bad_page;
37e29d90
AK		 3304 int r;
3305
b5a33a75
AK		 3306 r = kvm_mmu_module_init();
3307 if (r)
3308 goto out4;
3309
37e29d90
AK		 3310 r = register_filesystem(&kvm_fs_type);
3311 if (r)
3312 goto out3;
6aa8b732 3313
37e29d90
AK		 3314 kvmfs_mnt = kern_mount(&kvm_fs_type);
3315 r = PTR_ERR(kvmfs_mnt);
3316 if (IS_ERR(kvmfs_mnt))
3317 goto out2;
6aa8b732
AK		 3318 kvm_init_debug();
3319
bf591b24
MR		 3320 kvm_init_msr_list();
3321
6aa8b732
AK		 3322 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3323 r = -ENOMEM;
3324 goto out;
3325 }
3326
3327 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3328 memset(__va(bad_page_address), 0, PAGE_SIZE);
3329
58e690e6 3330 return 0;
6aa8b732
AK		 3331
3332out:
3333 kvm_exit_debug();
37e29d90
AK		 3334 mntput(kvmfs_mnt);
3335out2:
3336 unregister_filesystem(&kvm_fs_type);
3337out3:
b5a33a75
AK		 3338 kvm_mmu_module_exit();
3339out4:
6aa8b732
AK		 3340 return r;
3341}
3342
3343static __exit void kvm_exit(void)
3344{
3345 kvm_exit_debug();
3346 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
37e29d90
AK		 3347 mntput(kvmfs_mnt);
3348 unregister_filesystem(&kvm_fs_type);
b5a33a75 3349 kvm_mmu_module_exit();
6aa8b732
AK		 3350}
3351
3352module_init(kvm_init)
3353module_exit(kvm_exit)
3354
3355EXPORT_SYMBOL_GPL(kvm_init_arch);
3356EXPORT_SYMBOL_GPL(kvm_exit_arch);
Linux 6.x block layer and io_uring tree(s)