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KVM: Add internal filesystem for generating inodes
[mirror_ubuntu-artful-kernel.git] / drivers / kvm / kvm_main.c
CommitLineData
6aa8b732
AK		 1/*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
8 *
9 * Authors:
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
12 *
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
15 *
16 */
17
18#include "kvm.h"
19
20#include <linux/kvm.h>
21#include <linux/module.h>
22#include <linux/errno.h>
23#include <asm/processor.h>
24#include <linux/percpu.h>
25#include <linux/gfp.h>
26#include <asm/msr.h>
27#include <linux/mm.h>
28#include <linux/miscdevice.h>
29#include <linux/vmalloc.h>
30#include <asm/uaccess.h>
31#include <linux/reboot.h>
32#include <asm/io.h>
33#include <linux/debugfs.h>
34#include <linux/highmem.h>
35#include <linux/file.h>
36#include <asm/desc.h>
59ae6c6b 37#include <linux/sysdev.h>
774c47f1 38#include <linux/cpu.h>
37e29d90
AK		 39#include <linux/fs.h>
40#include <linux/mount.h>
6aa8b732
AK		 41
42#include "x86_emulate.h"
43#include "segment_descriptor.h"
44
45MODULE_AUTHOR("Qumranet");
46MODULE_LICENSE("GPL");
47
133de902
AK		 48static DEFINE_SPINLOCK(kvm_lock);
49static LIST_HEAD(vm_list);
50
6aa8b732
AK		 51struct kvm_arch_ops *kvm_arch_ops;
52struct kvm_stat kvm_stat;
53EXPORT_SYMBOL_GPL(kvm_stat);
54
55static struct kvm_stats_debugfs_item {
56 const char *name;
57 u32 *data;
58 struct dentry *dentry;
59} debugfs_entries[] = {
60 { "pf_fixed", &kvm_stat.pf_fixed },
61 { "pf_guest", &kvm_stat.pf_guest },
62 { "tlb_flush", &kvm_stat.tlb_flush },
63 { "invlpg", &kvm_stat.invlpg },
64 { "exits", &kvm_stat.exits },
65 { "io_exits", &kvm_stat.io_exits },
66 { "mmio_exits", &kvm_stat.mmio_exits },
67 { "signal_exits", &kvm_stat.signal_exits },
c1150d8c
DL		 68 { "irq_window", &kvm_stat.irq_window_exits },
69 { "halt_exits", &kvm_stat.halt_exits },
70 { "request_irq", &kvm_stat.request_irq_exits },
6aa8b732 71 { "irq_exits", &kvm_stat.irq_exits },
8b6d44c7 72 { NULL, NULL }
6aa8b732
AK		 73};
74
75static struct dentry *debugfs_dir;
76
37e29d90
AK		 77#define KVMFS_MAGIC 0x19700426
78struct vfsmount *kvmfs_mnt;
79
6aa8b732
AK		 80#define MAX_IO_MSRS 256
81
82#define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
83#define LMSW_GUEST_MASK 0x0eULL
84#define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
85#define CR8_RESEVED_BITS (~0x0fULL)
86#define EFER_RESERVED_BITS 0xfffffffffffff2fe
87
05b3e0c2 88#ifdef CONFIG_X86_64
6aa8b732
AK		 89// LDT or TSS descriptor in the GDT. 16 bytes.
90struct segment_descriptor_64 {
91 struct segment_descriptor s;
92 u32 base_higher;
93 u32 pad_zero;
94};
95
96#endif
97
98unsigned long segment_base(u16 selector)
99{
100 struct descriptor_table gdt;
101 struct segment_descriptor *d;
102 unsigned long table_base;
103 typedef unsigned long ul;
104 unsigned long v;
105
106 if (selector == 0)
107 return 0;
108
109 asm ("sgdt %0" : "=m"(gdt));
110 table_base = gdt.base;
111
112 if (selector & 4) { /* from ldt */
113 u16 ldt_selector;
114
115 asm ("sldt %0" : "=g"(ldt_selector));
116 table_base = segment_base(ldt_selector);
117 }
118 d = (struct segment_descriptor *)(table_base + (selector & ~7));
119 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
05b3e0c2 120#ifdef CONFIG_X86_64
6aa8b732
AK		 121 if (d->system == 0
122 && (d->type == 2 || d->type == 9 || d->type == 11))
123 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
124#endif
125 return v;
126}
127EXPORT_SYMBOL_GPL(segment_base);
128
5aacf0ca
JM		 129static inline int valid_vcpu(int n)
130{
131 return likely(n >= 0 && n < KVM_MAX_VCPUS);
132}
133
d27d4aca
AK		 134int kvm_read_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
135 void *dest)
6aa8b732
AK		 136{
137 unsigned char *host_buf = dest;
138 unsigned long req_size = size;
139
140 while (size) {
141 hpa_t paddr;
142 unsigned now;
143 unsigned offset;
144 hva_t guest_buf;
145
146 paddr = gva_to_hpa(vcpu, addr);
147
148 if (is_error_hpa(paddr))
149 break;
150
151 guest_buf = (hva_t)kmap_atomic(
152 pfn_to_page(paddr >> PAGE_SHIFT),
153 KM_USER0);
154 offset = addr & ~PAGE_MASK;
155 guest_buf |= offset;
156 now = min(size, PAGE_SIZE - offset);
157 memcpy(host_buf, (void*)guest_buf, now);
158 host_buf += now;
159 addr += now;
160 size -= now;
161 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
162 }
163 return req_size - size;
164}
165EXPORT_SYMBOL_GPL(kvm_read_guest);
166
d27d4aca
AK		 167int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
168 void *data)
6aa8b732
AK		 169{
170 unsigned char *host_buf = data;
171 unsigned long req_size = size;
172
173 while (size) {
174 hpa_t paddr;
175 unsigned now;
176 unsigned offset;
177 hva_t guest_buf;
178
179 paddr = gva_to_hpa(vcpu, addr);
180
181 if (is_error_hpa(paddr))
182 break;
183
184 guest_buf = (hva_t)kmap_atomic(
185 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
186 offset = addr & ~PAGE_MASK;
187 guest_buf |= offset;
188 now = min(size, PAGE_SIZE - offset);
189 memcpy((void*)guest_buf, host_buf, now);
190 host_buf += now;
191 addr += now;
192 size -= now;
193 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
194 }
195 return req_size - size;
196}
197EXPORT_SYMBOL_GPL(kvm_write_guest);
198
199static int vcpu_slot(struct kvm_vcpu *vcpu)
200{
201 return vcpu - vcpu->kvm->vcpus;
202}
203
204/*
205 * Switches to specified vcpu, until a matching vcpu_put()
206 */
207static struct kvm_vcpu *vcpu_load(struct kvm *kvm, int vcpu_slot)
208{
209 struct kvm_vcpu *vcpu = &kvm->vcpus[vcpu_slot];
210
211 mutex_lock(&vcpu->mutex);
212 if (unlikely(!vcpu->vmcs)) {
213 mutex_unlock(&vcpu->mutex);
8b6d44c7 214 return NULL;
6aa8b732
AK		 215 }
216 return kvm_arch_ops->vcpu_load(vcpu);
217}
218
219static void vcpu_put(struct kvm_vcpu *vcpu)
220{
221 kvm_arch_ops->vcpu_put(vcpu);
6aa8b732
AK		 222 mutex_unlock(&vcpu->mutex);
223}
224
225static int kvm_dev_open(struct inode *inode, struct file *filp)
226{
227 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
228 int i;
229
230 if (!kvm)
231 return -ENOMEM;
232
233 spin_lock_init(&kvm->lock);
234 INIT_LIST_HEAD(&kvm->active_mmu_pages);
235 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
236 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
237
238 mutex_init(&vcpu->mutex);
133de902 239 vcpu->cpu = -1;
86a2b42e 240 vcpu->kvm = kvm;
6aa8b732
AK		 241 vcpu->mmu.root_hpa = INVALID_PAGE;
242 INIT_LIST_HEAD(&vcpu->free_pages);
133de902
AK		 243 spin_lock(&kvm_lock);
244 list_add(&kvm->vm_list, &vm_list);
245 spin_unlock(&kvm_lock);
6aa8b732
AK		 246 }
247 filp->private_data = kvm;
248 return 0;
249}
250
251/*
252 * Free any memory in @free but not in @dont.
253 */
254static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
255 struct kvm_memory_slot *dont)
256{
257 int i;
258
259 if (!dont || free->phys_mem != dont->phys_mem)
260 if (free->phys_mem) {
261 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 262 if (free->phys_mem[i])
263 __free_page(free->phys_mem[i]);
6aa8b732
AK		 264 vfree(free->phys_mem);
265 }
266
267 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
268 vfree(free->dirty_bitmap);
269
8b6d44c7 270 free->phys_mem = NULL;
6aa8b732 271 free->npages = 0;
8b6d44c7 272 free->dirty_bitmap = NULL;
6aa8b732
AK		 273}
274
275static void kvm_free_physmem(struct kvm *kvm)
276{
277 int i;
278
279 for (i = 0; i < kvm->nmemslots; ++i)
8b6d44c7 280 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
6aa8b732
AK		 281}
282
283static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
284{
1e8ba6fb
IM		 285 if (!vcpu_load(vcpu->kvm, vcpu_slot(vcpu)))
286 return;
287
6aa8b732 288 kvm_mmu_destroy(vcpu);
08438475 289 vcpu_put(vcpu);
9ede74e0 290 kvm_arch_ops->vcpu_free(vcpu);
6aa8b732
AK		 291}
292
293static void kvm_free_vcpus(struct kvm *kvm)
294{
295 unsigned int i;
296
297 for (i = 0; i < KVM_MAX_VCPUS; ++i)
298 kvm_free_vcpu(&kvm->vcpus[i]);
299}
300
301static int kvm_dev_release(struct inode *inode, struct file *filp)
302{
303 struct kvm *kvm = filp->private_data;
304
133de902
AK		 305 spin_lock(&kvm_lock);
306 list_del(&kvm->vm_list);
307 spin_unlock(&kvm_lock);
6aa8b732
AK		 308 kvm_free_vcpus(kvm);
309 kvm_free_physmem(kvm);
310 kfree(kvm);
311 return 0;
312}
313
314static void inject_gp(struct kvm_vcpu *vcpu)
315{
316 kvm_arch_ops->inject_gp(vcpu, 0);
317}
318
1342d353
AK		 319/*
320 * Load the pae pdptrs. Return true is they are all valid.
321 */
322static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
6aa8b732
AK		 323{
324 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
1342d353 325 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
6aa8b732
AK		 326 int i;
327 u64 pdpte;
328 u64 *pdpt;
1342d353 329 int ret;
6aa8b732
AK		 330 struct kvm_memory_slot *memslot;
331
332 spin_lock(&vcpu->kvm->lock);
333 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
334 /* FIXME: !memslot - emulate? 0xff? */
335 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
336
1342d353 337 ret = 1;
6aa8b732
AK		 338 for (i = 0; i < 4; ++i) {
339 pdpte = pdpt[offset + i];
1342d353
AK		 340 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
341 ret = 0;
342 goto out;
343 }
6aa8b732
AK		 344 }
345
1342d353
AK		 346 for (i = 0; i < 4; ++i)
347 vcpu->pdptrs[i] = pdpt[offset + i];
348
349out:
6aa8b732
AK		 350 kunmap_atomic(pdpt, KM_USER0);
351 spin_unlock(&vcpu->kvm->lock);
352
1342d353 353 return ret;
6aa8b732
AK		 354}
355
356void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
357{
358 if (cr0 & CR0_RESEVED_BITS) {
359 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
360 cr0, vcpu->cr0);
361 inject_gp(vcpu);
362 return;
363 }
364
365 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
366 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
367 inject_gp(vcpu);
368 return;
369 }
370
371 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
372 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
373 "and a clear PE flag\n");
374 inject_gp(vcpu);
375 return;
376 }
377
378 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 379#ifdef CONFIG_X86_64
6aa8b732
AK		 380 if ((vcpu->shadow_efer & EFER_LME)) {
381 int cs_db, cs_l;
382
383 if (!is_pae(vcpu)) {
384 printk(KERN_DEBUG "set_cr0: #GP, start paging "
385 "in long mode while PAE is disabled\n");
386 inject_gp(vcpu);
387 return;
388 }
389 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
390 if (cs_l) {
391 printk(KERN_DEBUG "set_cr0: #GP, start paging "
392 "in long mode while CS.L == 1\n");
393 inject_gp(vcpu);
394 return;
395
396 }
397 } else
398#endif
1342d353 399 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 400 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
401 "reserved bits\n");
402 inject_gp(vcpu);
403 return;
404 }
405
406 }
407
408 kvm_arch_ops->set_cr0(vcpu, cr0);
409 vcpu->cr0 = cr0;
410
411 spin_lock(&vcpu->kvm->lock);
412 kvm_mmu_reset_context(vcpu);
413 spin_unlock(&vcpu->kvm->lock);
414 return;
415}
416EXPORT_SYMBOL_GPL(set_cr0);
417
418void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
419{
399badf3 420 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 421 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
422}
423EXPORT_SYMBOL_GPL(lmsw);
424
425void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
426{
427 if (cr4 & CR4_RESEVED_BITS) {
428 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
429 inject_gp(vcpu);
430 return;
431 }
432
a9058ecd 433 if (is_long_mode(vcpu)) {
6aa8b732
AK		 434 if (!(cr4 & CR4_PAE_MASK)) {
435 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
436 "in long mode\n");
437 inject_gp(vcpu);
438 return;
439 }
440 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
1342d353 441 && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 442 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
443 inject_gp(vcpu);
444 }
445
446 if (cr4 & CR4_VMXE_MASK) {
447 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
448 inject_gp(vcpu);
449 return;
450 }
451 kvm_arch_ops->set_cr4(vcpu, cr4);
452 spin_lock(&vcpu->kvm->lock);
453 kvm_mmu_reset_context(vcpu);
454 spin_unlock(&vcpu->kvm->lock);
455}
456EXPORT_SYMBOL_GPL(set_cr4);
457
458void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
459{
a9058ecd 460 if (is_long_mode(vcpu)) {
d27d4aca 461 if (cr3 & CR3_L_MODE_RESEVED_BITS) {
6aa8b732
AK		 462 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
463 inject_gp(vcpu);
464 return;
465 }
466 } else {
467 if (cr3 & CR3_RESEVED_BITS) {
468 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
469 inject_gp(vcpu);
470 return;
471 }
472 if (is_paging(vcpu) && is_pae(vcpu) &&
1342d353 473 !load_pdptrs(vcpu, cr3)) {
6aa8b732
AK		 474 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
475 "reserved bits\n");
476 inject_gp(vcpu);
477 return;
478 }
479 }
480
481 vcpu->cr3 = cr3;
482 spin_lock(&vcpu->kvm->lock);
d21225ee
IM		 483 /*
484 * Does the new cr3 value map to physical memory? (Note, we
485 * catch an invalid cr3 even in real-mode, because it would
486 * cause trouble later on when we turn on paging anyway.)
487 *
488 * A real CPU would silently accept an invalid cr3 and would
489 * attempt to use it - with largely undefined (and often hard
490 * to debug) behavior on the guest side.
491 */
492 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
493 inject_gp(vcpu);
494 else
495 vcpu->mmu.new_cr3(vcpu);
6aa8b732
AK		 496 spin_unlock(&vcpu->kvm->lock);
497}
498EXPORT_SYMBOL_GPL(set_cr3);
499
500void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
501{
502 if ( cr8 & CR8_RESEVED_BITS) {
503 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
504 inject_gp(vcpu);
505 return;
506 }
507 vcpu->cr8 = cr8;
508}
509EXPORT_SYMBOL_GPL(set_cr8);
510
511void fx_init(struct kvm_vcpu *vcpu)
512{
513 struct __attribute__ ((__packed__)) fx_image_s {
514 u16 control; //fcw
515 u16 status; //fsw
516 u16 tag; // ftw
517 u16 opcode; //fop
518 u64 ip; // fpu ip
519 u64 operand;// fpu dp
520 u32 mxcsr;
521 u32 mxcsr_mask;
522
523 } *fx_image;
524
525 fx_save(vcpu->host_fx_image);
526 fpu_init();
527 fx_save(vcpu->guest_fx_image);
528 fx_restore(vcpu->host_fx_image);
529
530 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
531 fx_image->mxcsr = 0x1f80;
532 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
533 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
534}
535EXPORT_SYMBOL_GPL(fx_init);
536
537/*
538 * Creates some virtual cpus. Good luck creating more than one.
539 */
540static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
541{
542 int r;
543 struct kvm_vcpu *vcpu;
544
545 r = -EINVAL;
5aacf0ca 546 if (!valid_vcpu(n))
6aa8b732
AK		 547 goto out;
548
549 vcpu = &kvm->vcpus[n];
550
551 mutex_lock(&vcpu->mutex);
552
553 if (vcpu->vmcs) {
554 mutex_unlock(&vcpu->mutex);
555 return -EEXIST;
556 }
557
558 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
559 FX_IMAGE_ALIGN);
560 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
561
6aa8b732
AK		 562 r = kvm_arch_ops->vcpu_create(vcpu);
563 if (r < 0)
564 goto out_free_vcpus;
565
8018c27b
IM		 566 r = kvm_mmu_create(vcpu);
567 if (r < 0)
568 goto out_free_vcpus;
6aa8b732 569
8018c27b
IM		 570 kvm_arch_ops->vcpu_load(vcpu);
571 r = kvm_mmu_setup(vcpu);
6aa8b732 572 if (r >= 0)
8018c27b 573 r = kvm_arch_ops->vcpu_setup(vcpu);
6aa8b732
AK		 574 vcpu_put(vcpu);
575
576 if (r < 0)
577 goto out_free_vcpus;
578
579 return 0;
580
581out_free_vcpus:
582 kvm_free_vcpu(vcpu);
583 mutex_unlock(&vcpu->mutex);
584out:
585 return r;
586}
587
588/*
589 * Allocate some memory and give it an address in the guest physical address
590 * space.
591 *
592 * Discontiguous memory is allowed, mostly for framebuffers.
593 */
594static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm,
595 struct kvm_memory_region *mem)
596{
597 int r;
598 gfn_t base_gfn;
599 unsigned long npages;
600 unsigned long i;
601 struct kvm_memory_slot *memslot;
602 struct kvm_memory_slot old, new;
603 int memory_config_version;
604
605 r = -EINVAL;
606 /* General sanity checks */
607 if (mem->memory_size & (PAGE_SIZE - 1))
608 goto out;
609 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
610 goto out;
611 if (mem->slot >= KVM_MEMORY_SLOTS)
612 goto out;
613 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
614 goto out;
615
616 memslot = &kvm->memslots[mem->slot];
617 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
618 npages = mem->memory_size >> PAGE_SHIFT;
619
620 if (!npages)
621 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
622
623raced:
624 spin_lock(&kvm->lock);
625
626 memory_config_version = kvm->memory_config_version;
627 new = old = *memslot;
628
629 new.base_gfn = base_gfn;
630 new.npages = npages;
631 new.flags = mem->flags;
632
633 /* Disallow changing a memory slot's size. */
634 r = -EINVAL;
635 if (npages && old.npages && npages != old.npages)
636 goto out_unlock;
637
638 /* Check for overlaps */
639 r = -EEXIST;
640 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
641 struct kvm_memory_slot *s = &kvm->memslots[i];
642
643 if (s == memslot)
644 continue;
645 if (!((base_gfn + npages <= s->base_gfn) ||
646 (base_gfn >= s->base_gfn + s->npages)))
647 goto out_unlock;
648 }
649 /*
650 * Do memory allocations outside lock. memory_config_version will
651 * detect any races.
652 */
653 spin_unlock(&kvm->lock);
654
655 /* Deallocate if slot is being removed */
656 if (!npages)
8b6d44c7 657 new.phys_mem = NULL;
6aa8b732
AK		 658
659 /* Free page dirty bitmap if unneeded */
660 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
8b6d44c7 661 new.dirty_bitmap = NULL;
6aa8b732
AK		 662
663 r = -ENOMEM;
664
665 /* Allocate if a slot is being created */
666 if (npages && !new.phys_mem) {
667 new.phys_mem = vmalloc(npages * sizeof(struct page *));
668
669 if (!new.phys_mem)
670 goto out_free;
671
672 memset(new.phys_mem, 0, npages * sizeof(struct page *));
673 for (i = 0; i < npages; ++i) {
674 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
675 | __GFP_ZERO);
676 if (!new.phys_mem[i])
677 goto out_free;
5972e953 678 set_page_private(new.phys_mem[i],0);
6aa8b732
AK		 679 }
680 }
681
682 /* Allocate page dirty bitmap if needed */
683 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
684 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
685
686 new.dirty_bitmap = vmalloc(dirty_bytes);
687 if (!new.dirty_bitmap)
688 goto out_free;
689 memset(new.dirty_bitmap, 0, dirty_bytes);
690 }
691
692 spin_lock(&kvm->lock);
693
694 if (memory_config_version != kvm->memory_config_version) {
695 spin_unlock(&kvm->lock);
696 kvm_free_physmem_slot(&new, &old);
697 goto raced;
698 }
699
700 r = -EAGAIN;
701 if (kvm->busy)
702 goto out_unlock;
703
704 if (mem->slot >= kvm->nmemslots)
705 kvm->nmemslots = mem->slot + 1;
706
707 *memslot = new;
708 ++kvm->memory_config_version;
709
710 spin_unlock(&kvm->lock);
711
712 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
713 struct kvm_vcpu *vcpu;
714
715 vcpu = vcpu_load(kvm, i);
716 if (!vcpu)
717 continue;
718 kvm_mmu_reset_context(vcpu);
719 vcpu_put(vcpu);
720 }
721
722 kvm_free_physmem_slot(&old, &new);
723 return 0;
724
725out_unlock:
726 spin_unlock(&kvm->lock);
727out_free:
728 kvm_free_physmem_slot(&new, &old);
729out:
730 return r;
731}
732
714b93da
AK		 733static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
734{
735 spin_lock(&vcpu->kvm->lock);
736 kvm_mmu_slot_remove_write_access(vcpu, slot);
737 spin_unlock(&vcpu->kvm->lock);
738}
739
6aa8b732
AK		 740/*
741 * Get (and clear) the dirty memory log for a memory slot.
742 */
743static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
744 struct kvm_dirty_log *log)
745{
746 struct kvm_memory_slot *memslot;
747 int r, i;
748 int n;
714b93da 749 int cleared;
6aa8b732
AK		 750 unsigned long any = 0;
751
752 spin_lock(&kvm->lock);
753
754 /*
755 * Prevent changes to guest memory configuration even while the lock
756 * is not taken.
757 */
758 ++kvm->busy;
759 spin_unlock(&kvm->lock);
760 r = -EINVAL;
761 if (log->slot >= KVM_MEMORY_SLOTS)
762 goto out;
763
764 memslot = &kvm->memslots[log->slot];
765 r = -ENOENT;
766 if (!memslot->dirty_bitmap)
767 goto out;
768
769 n = ALIGN(memslot->npages, 8) / 8;
770
771 for (i = 0; !any && i < n; ++i)
772 any = memslot->dirty_bitmap[i];
773
774 r = -EFAULT;
775 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
776 goto out;
777
6aa8b732 778 if (any) {
714b93da 779 cleared = 0;
6aa8b732
AK		 780 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
781 struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
782
783 if (!vcpu)
784 continue;
714b93da
AK		 785 if (!cleared) {
786 do_remove_write_access(vcpu, log->slot);
787 memset(memslot->dirty_bitmap, 0, n);
788 cleared = 1;
789 }
6aa8b732
AK		 790 kvm_arch_ops->tlb_flush(vcpu);
791 vcpu_put(vcpu);
792 }
793 }
794
795 r = 0;
796
797out:
798 spin_lock(&kvm->lock);
799 --kvm->busy;
800 spin_unlock(&kvm->lock);
801 return r;
802}
803
804struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
805{
806 int i;
807
808 for (i = 0; i < kvm->nmemslots; ++i) {
809 struct kvm_memory_slot *memslot = &kvm->memslots[i];
810
811 if (gfn >= memslot->base_gfn
812 && gfn < memslot->base_gfn + memslot->npages)
813 return memslot;
814 }
8b6d44c7 815 return NULL;
6aa8b732
AK		 816}
817EXPORT_SYMBOL_GPL(gfn_to_memslot);
818
819void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
820{
821 int i;
8b6d44c7 822 struct kvm_memory_slot *memslot = NULL;
6aa8b732
AK		 823 unsigned long rel_gfn;
824
825 for (i = 0; i < kvm->nmemslots; ++i) {
826 memslot = &kvm->memslots[i];
827
828 if (gfn >= memslot->base_gfn
829 && gfn < memslot->base_gfn + memslot->npages) {
830
831 if (!memslot || !memslot->dirty_bitmap)
832 return;
833
834 rel_gfn = gfn - memslot->base_gfn;
835
836 /* avoid RMW */
837 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
838 set_bit(rel_gfn, memslot->dirty_bitmap);
839 return;
840 }
841 }
842}
843
844static int emulator_read_std(unsigned long addr,
845 unsigned long *val,
846 unsigned int bytes,
847 struct x86_emulate_ctxt *ctxt)
848{
849 struct kvm_vcpu *vcpu = ctxt->vcpu;
850 void *data = val;
851
852 while (bytes) {
853 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
854 unsigned offset = addr & (PAGE_SIZE-1);
855 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
856 unsigned long pfn;
857 struct kvm_memory_slot *memslot;
858 void *page;
859
860 if (gpa == UNMAPPED_GVA)
861 return X86EMUL_PROPAGATE_FAULT;
862 pfn = gpa >> PAGE_SHIFT;
863 memslot = gfn_to_memslot(vcpu->kvm, pfn);
864 if (!memslot)
865 return X86EMUL_UNHANDLEABLE;
866 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
867
868 memcpy(data, page + offset, tocopy);
869
870 kunmap_atomic(page, KM_USER0);
871
872 bytes -= tocopy;
873 data += tocopy;
874 addr += tocopy;
875 }
876
877 return X86EMUL_CONTINUE;
878}
879
880static int emulator_write_std(unsigned long addr,
881 unsigned long val,
882 unsigned int bytes,
883 struct x86_emulate_ctxt *ctxt)
884{
885 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
886 addr, bytes);
887 return X86EMUL_UNHANDLEABLE;
888}
889
890static int emulator_read_emulated(unsigned long addr,
891 unsigned long *val,
892 unsigned int bytes,
893 struct x86_emulate_ctxt *ctxt)
894{
895 struct kvm_vcpu *vcpu = ctxt->vcpu;
896
897 if (vcpu->mmio_read_completed) {
898 memcpy(val, vcpu->mmio_data, bytes);
899 vcpu->mmio_read_completed = 0;
900 return X86EMUL_CONTINUE;
901 } else if (emulator_read_std(addr, val, bytes, ctxt)
902 == X86EMUL_CONTINUE)
903 return X86EMUL_CONTINUE;
904 else {
905 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
d27d4aca 906
6aa8b732 907 if (gpa == UNMAPPED_GVA)
d27d4aca 908 return X86EMUL_PROPAGATE_FAULT;
6aa8b732
AK		 909 vcpu->mmio_needed = 1;
910 vcpu->mmio_phys_addr = gpa;
911 vcpu->mmio_size = bytes;
912 vcpu->mmio_is_write = 0;
913
914 return X86EMUL_UNHANDLEABLE;
915 }
916}
917
da4a00f0
AK		 918static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
919 unsigned long val, int bytes)
920{
921 struct kvm_memory_slot *m;
922 struct page *page;
923 void *virt;
924
925 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
926 return 0;
927 m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
928 if (!m)
929 return 0;
930 page = gfn_to_page(m, gpa >> PAGE_SHIFT);
931 kvm_mmu_pre_write(vcpu, gpa, bytes);
932 virt = kmap_atomic(page, KM_USER0);
933 memcpy(virt + offset_in_page(gpa), &val, bytes);
934 kunmap_atomic(virt, KM_USER0);
935 kvm_mmu_post_write(vcpu, gpa, bytes);
936 return 1;
937}
938
6aa8b732
AK		 939static int emulator_write_emulated(unsigned long addr,
940 unsigned long val,
941 unsigned int bytes,
942 struct x86_emulate_ctxt *ctxt)
943{
944 struct kvm_vcpu *vcpu = ctxt->vcpu;
945 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
946
947 if (gpa == UNMAPPED_GVA)
948 return X86EMUL_PROPAGATE_FAULT;
949
da4a00f0
AK		 950 if (emulator_write_phys(vcpu, gpa, val, bytes))
951 return X86EMUL_CONTINUE;
952
6aa8b732
AK		 953 vcpu->mmio_needed = 1;
954 vcpu->mmio_phys_addr = gpa;
955 vcpu->mmio_size = bytes;
956 vcpu->mmio_is_write = 1;
957 memcpy(vcpu->mmio_data, &val, bytes);
958
959 return X86EMUL_CONTINUE;
960}
961
962static int emulator_cmpxchg_emulated(unsigned long addr,
963 unsigned long old,
964 unsigned long new,
965 unsigned int bytes,
966 struct x86_emulate_ctxt *ctxt)
967{
968 static int reported;
969
970 if (!reported) {
971 reported = 1;
972 printk(KERN_WARNING "kvm: emulating exchange as write\n");
973 }
974 return emulator_write_emulated(addr, new, bytes, ctxt);
975}
976
32b35627
AK		 977#ifdef CONFIG_X86_32
978
979static int emulator_cmpxchg8b_emulated(unsigned long addr,
980 unsigned long old_lo,
981 unsigned long old_hi,
982 unsigned long new_lo,
983 unsigned long new_hi,
984 struct x86_emulate_ctxt *ctxt)
985{
986 static int reported;
987 int r;
988
989 if (!reported) {
990 reported = 1;
991 printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
992 }
993 r = emulator_write_emulated(addr, new_lo, 4, ctxt);
994 if (r != X86EMUL_CONTINUE)
995 return r;
996 return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
997}
998
999#endif
1000
6aa8b732
AK		 1001static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1002{
1003 return kvm_arch_ops->get_segment_base(vcpu, seg);
1004}
1005
1006int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1007{
6aa8b732
AK		 1008 return X86EMUL_CONTINUE;
1009}
1010
1011int emulate_clts(struct kvm_vcpu *vcpu)
1012{
399badf3 1013 unsigned long cr0;
6aa8b732 1014
399badf3
AK		 1015 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1016 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
6aa8b732
AK		 1017 kvm_arch_ops->set_cr0(vcpu, cr0);
1018 return X86EMUL_CONTINUE;
1019}
1020
1021int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1022{
1023 struct kvm_vcpu *vcpu = ctxt->vcpu;
1024
1025 switch (dr) {
1026 case 0 ... 3:
1027 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1028 return X86EMUL_CONTINUE;
1029 default:
1030 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1031 __FUNCTION__, dr);
1032 return X86EMUL_UNHANDLEABLE;
1033 }
1034}
1035
1036int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1037{
1038 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1039 int exception;
1040
1041 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1042 if (exception) {
1043 /* FIXME: better handling */
1044 return X86EMUL_UNHANDLEABLE;
1045 }
1046 return X86EMUL_CONTINUE;
1047}
1048
1049static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1050{
1051 static int reported;
1052 u8 opcodes[4];
1053 unsigned long rip = ctxt->vcpu->rip;
1054 unsigned long rip_linear;
1055
1056 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1057
1058 if (reported)
1059 return;
1060
1061 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1062
1063 printk(KERN_ERR "emulation failed but !mmio_needed?"
1064 " rip %lx %02x %02x %02x %02x\n",
1065 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1066 reported = 1;
1067}
1068
1069struct x86_emulate_ops emulate_ops = {
1070 .read_std = emulator_read_std,
1071 .write_std = emulator_write_std,
1072 .read_emulated = emulator_read_emulated,
1073 .write_emulated = emulator_write_emulated,
1074 .cmpxchg_emulated = emulator_cmpxchg_emulated,
32b35627
AK		 1075#ifdef CONFIG_X86_32
1076 .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated,
1077#endif
6aa8b732
AK		 1078};
1079
1080int emulate_instruction(struct kvm_vcpu *vcpu,
1081 struct kvm_run *run,
1082 unsigned long cr2,
1083 u16 error_code)
1084{
1085 struct x86_emulate_ctxt emulate_ctxt;
1086 int r;
1087 int cs_db, cs_l;
1088
1089 kvm_arch_ops->cache_regs(vcpu);
1090
1091 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1092
1093 emulate_ctxt.vcpu = vcpu;
1094 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1095 emulate_ctxt.cr2 = cr2;
1096 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1097 ? X86EMUL_MODE_REAL : cs_l
1098 ? X86EMUL_MODE_PROT64 : cs_db
1099 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1100
1101 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1102 emulate_ctxt.cs_base = 0;
1103 emulate_ctxt.ds_base = 0;
1104 emulate_ctxt.es_base = 0;
1105 emulate_ctxt.ss_base = 0;
1106 } else {
1107 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1108 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1109 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1110 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1111 }
1112
1113 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1114 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1115
1116 vcpu->mmio_is_write = 0;
1117 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1118
1119 if ((r || vcpu->mmio_is_write) && run) {
1120 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1121 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1122 run->mmio.len = vcpu->mmio_size;
1123 run->mmio.is_write = vcpu->mmio_is_write;
1124 }
1125
1126 if (r) {
a436036b
AK		 1127 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1128 return EMULATE_DONE;
6aa8b732
AK		 1129 if (!vcpu->mmio_needed) {
1130 report_emulation_failure(&emulate_ctxt);
1131 return EMULATE_FAIL;
1132 }
1133 return EMULATE_DO_MMIO;
1134 }
1135
1136 kvm_arch_ops->decache_regs(vcpu);
1137 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1138
1139 if (vcpu->mmio_is_write)
1140 return EMULATE_DO_MMIO;
1141
1142 return EMULATE_DONE;
1143}
1144EXPORT_SYMBOL_GPL(emulate_instruction);
1145
270fd9b9
AK		 1146int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1147{
1148 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1149
1150 kvm_arch_ops->decache_regs(vcpu);
1151 ret = -KVM_EINVAL;
1152#ifdef CONFIG_X86_64
1153 if (is_long_mode(vcpu)) {
1154 nr = vcpu->regs[VCPU_REGS_RAX];
1155 a0 = vcpu->regs[VCPU_REGS_RDI];
1156 a1 = vcpu->regs[VCPU_REGS_RSI];
1157 a2 = vcpu->regs[VCPU_REGS_RDX];
1158 a3 = vcpu->regs[VCPU_REGS_RCX];
1159 a4 = vcpu->regs[VCPU_REGS_R8];
1160 a5 = vcpu->regs[VCPU_REGS_R9];
1161 } else
1162#endif
1163 {
1164 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1165 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1166 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1167 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1168 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1169 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1170 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1171 }
1172 switch (nr) {
1173 default:
1174 ;
1175 }
1176 vcpu->regs[VCPU_REGS_RAX] = ret;
1177 kvm_arch_ops->cache_regs(vcpu);
1178 return 1;
1179}
1180EXPORT_SYMBOL_GPL(kvm_hypercall);
1181
6aa8b732
AK		 1182static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1183{
1184 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1185}
1186
1187void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1188{
1189 struct descriptor_table dt = { limit, base };
1190
1191 kvm_arch_ops->set_gdt(vcpu, &dt);
1192}
1193
1194void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1195{
1196 struct descriptor_table dt = { limit, base };
1197
1198 kvm_arch_ops->set_idt(vcpu, &dt);
1199}
1200
1201void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1202 unsigned long *rflags)
1203{
1204 lmsw(vcpu, msw);
1205 *rflags = kvm_arch_ops->get_rflags(vcpu);
1206}
1207
1208unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1209{
399badf3 1210 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1211 switch (cr) {
1212 case 0:
1213 return vcpu->cr0;
1214 case 2:
1215 return vcpu->cr2;
1216 case 3:
1217 return vcpu->cr3;
1218 case 4:
1219 return vcpu->cr4;
1220 default:
1221 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1222 return 0;
1223 }
1224}
1225
1226void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1227 unsigned long *rflags)
1228{
1229 switch (cr) {
1230 case 0:
1231 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1232 *rflags = kvm_arch_ops->get_rflags(vcpu);
1233 break;
1234 case 2:
1235 vcpu->cr2 = val;
1236 break;
1237 case 3:
1238 set_cr3(vcpu, val);
1239 break;
1240 case 4:
1241 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1242 break;
1243 default:
1244 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1245 }
1246}
1247
102d8325
IM		 1248/*
1249 * Register the para guest with the host:
1250 */
1251static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1252{
1253 struct kvm_vcpu_para_state *para_state;
1254 hpa_t para_state_hpa, hypercall_hpa;
1255 struct page *para_state_page;
1256 unsigned char *hypercall;
1257 gpa_t hypercall_gpa;
1258
1259 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1260 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1261
1262 /*
1263 * Needs to be page aligned:
1264 */
1265 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1266 goto err_gp;
1267
1268 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1269 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1270 if (is_error_hpa(para_state_hpa))
1271 goto err_gp;
1272
1273 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1274 para_state = kmap_atomic(para_state_page, KM_USER0);
1275
1276 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1277 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1278
1279 para_state->host_version = KVM_PARA_API_VERSION;
1280 /*
1281 * We cannot support guests that try to register themselves
1282 * with a newer API version than the host supports:
1283 */
1284 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1285 para_state->ret = -KVM_EINVAL;
1286 goto err_kunmap_skip;
1287 }
1288
1289 hypercall_gpa = para_state->hypercall_gpa;
1290 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1291 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1292 if (is_error_hpa(hypercall_hpa)) {
1293 para_state->ret = -KVM_EINVAL;
1294 goto err_kunmap_skip;
1295 }
1296
1297 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1298 vcpu->para_state_page = para_state_page;
1299 vcpu->para_state_gpa = para_state_gpa;
1300 vcpu->hypercall_gpa = hypercall_gpa;
1301
1302 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1303 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1304 kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1305 kunmap_atomic(hypercall, KM_USER1);
1306
1307 para_state->ret = 0;
1308err_kunmap_skip:
1309 kunmap_atomic(para_state, KM_USER0);
1310 return 0;
1311err_gp:
1312 return 1;
1313}
1314
3bab1f5d
AK		 1315int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1316{
1317 u64 data;
1318
1319 switch (msr) {
1320 case 0xc0010010: /* SYSCFG */
1321 case 0xc0010015: /* HWCR */
1322 case MSR_IA32_PLATFORM_ID:
1323 case MSR_IA32_P5_MC_ADDR:
1324 case MSR_IA32_P5_MC_TYPE:
1325 case MSR_IA32_MC0_CTL:
1326 case MSR_IA32_MCG_STATUS:
1327 case MSR_IA32_MCG_CAP:
1328 case MSR_IA32_MC0_MISC:
1329 case MSR_IA32_MC0_MISC+4:
1330 case MSR_IA32_MC0_MISC+8:
1331 case MSR_IA32_MC0_MISC+12:
1332 case MSR_IA32_MC0_MISC+16:
1333 case MSR_IA32_UCODE_REV:
a8d13ea2 1334 case MSR_IA32_PERF_STATUS:
3bab1f5d
AK		 1335 /* MTRR registers */
1336 case 0xfe:
1337 case 0x200 ... 0x2ff:
1338 data = 0;
1339 break;
a8d13ea2
AK		 1340 case 0xcd: /* fsb frequency */
1341 data = 3;
1342 break;
3bab1f5d
AK		 1343 case MSR_IA32_APICBASE:
1344 data = vcpu->apic_base;
1345 break;
6f00e68f
AK		 1346 case MSR_IA32_MISC_ENABLE:
1347 data = vcpu->ia32_misc_enable_msr;
1348 break;
3bab1f5d
AK		 1349#ifdef CONFIG_X86_64
1350 case MSR_EFER:
1351 data = vcpu->shadow_efer;
1352 break;
1353#endif
1354 default:
1355 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1356 return 1;
1357 }
1358 *pdata = data;
1359 return 0;
1360}
1361EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1362
6aa8b732
AK		 1363/*
1364 * Reads an msr value (of 'msr_index') into 'pdata'.
1365 * Returns 0 on success, non-0 otherwise.
1366 * Assumes vcpu_load() was already called.
1367 */
1368static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1369{
1370 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1371}
1372
05b3e0c2 1373#ifdef CONFIG_X86_64
6aa8b732 1374
3bab1f5d 1375static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1376{
6aa8b732
AK		 1377 if (efer & EFER_RESERVED_BITS) {
1378 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1379 efer);
1380 inject_gp(vcpu);
1381 return;
1382 }
1383
1384 if (is_paging(vcpu)
1385 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1386 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1387 inject_gp(vcpu);
1388 return;
1389 }
1390
7725f0ba
AK		 1391 kvm_arch_ops->set_efer(vcpu, efer);
1392
6aa8b732
AK		 1393 efer &= ~EFER_LMA;
1394 efer |= vcpu->shadow_efer & EFER_LMA;
1395
1396 vcpu->shadow_efer = efer;
6aa8b732 1397}
6aa8b732
AK		 1398
1399#endif
1400
3bab1f5d
AK		 1401int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1402{
1403 switch (msr) {
1404#ifdef CONFIG_X86_64
1405 case MSR_EFER:
1406 set_efer(vcpu, data);
1407 break;
1408#endif
1409 case MSR_IA32_MC0_STATUS:
1410 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1411 __FUNCTION__, data);
1412 break;
1413 case MSR_IA32_UCODE_REV:
1414 case MSR_IA32_UCODE_WRITE:
1415 case 0x200 ... 0x2ff: /* MTRRs */
1416 break;
1417 case MSR_IA32_APICBASE:
1418 vcpu->apic_base = data;
1419 break;
6f00e68f
AK		 1420 case MSR_IA32_MISC_ENABLE:
1421 vcpu->ia32_misc_enable_msr = data;
1422 break;
102d8325
IM		 1423 /*
1424 * This is the 'probe whether the host is KVM' logic:
1425 */
1426 case MSR_KVM_API_MAGIC:
1427 return vcpu_register_para(vcpu, data);
1428
3bab1f5d
AK		 1429 default:
1430 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1431 return 1;
1432 }
1433 return 0;
1434}
1435EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1436
6aa8b732
AK		 1437/*
1438 * Writes msr value into into the appropriate "register".
1439 * Returns 0 on success, non-0 otherwise.
1440 * Assumes vcpu_load() was already called.
1441 */
1442static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1443{
1444 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1445}
1446
1447void kvm_resched(struct kvm_vcpu *vcpu)
1448{
1449 vcpu_put(vcpu);
1450 cond_resched();
1451 /* Cannot fail - no vcpu unplug yet. */
1452 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1453}
1454EXPORT_SYMBOL_GPL(kvm_resched);
1455
1456void load_msrs(struct vmx_msr_entry *e, int n)
1457{
1458 int i;
1459
1460 for (i = 0; i < n; ++i)
1461 wrmsrl(e[i].index, e[i].data);
1462}
1463EXPORT_SYMBOL_GPL(load_msrs);
1464
1465void save_msrs(struct vmx_msr_entry *e, int n)
1466{
1467 int i;
1468
1469 for (i = 0; i < n; ++i)
1470 rdmsrl(e[i].index, e[i].data);
1471}
1472EXPORT_SYMBOL_GPL(save_msrs);
1473
1474static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1475{
1476 struct kvm_vcpu *vcpu;
1477 int r;
1478
5aacf0ca 1479 if (!valid_vcpu(kvm_run->vcpu))
6aa8b732
AK		 1480 return -EINVAL;
1481
1482 vcpu = vcpu_load(kvm, kvm_run->vcpu);
1483 if (!vcpu)
1484 return -ENOENT;
1485
54810342
DL		 1486 /* re-sync apic's tpr */
1487 vcpu->cr8 = kvm_run->cr8;
1488
6aa8b732
AK		 1489 if (kvm_run->emulated) {
1490 kvm_arch_ops->skip_emulated_instruction(vcpu);
1491 kvm_run->emulated = 0;
1492 }
1493
1494 if (kvm_run->mmio_completed) {
1495 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1496 vcpu->mmio_read_completed = 1;
1497 }
1498
1499 vcpu->mmio_needed = 0;
1500
1501 r = kvm_arch_ops->run(vcpu, kvm_run);
1502
1503 vcpu_put(vcpu);
1504 return r;
1505}
1506
1507static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1508{
1509 struct kvm_vcpu *vcpu;
1510
5aacf0ca 1511 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1512 return -EINVAL;
1513
1514 vcpu = vcpu_load(kvm, regs->vcpu);
1515 if (!vcpu)
1516 return -ENOENT;
1517
1518 kvm_arch_ops->cache_regs(vcpu);
1519
1520 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1521 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1522 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1523 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1524 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1525 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1526 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1527 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1528#ifdef CONFIG_X86_64
6aa8b732
AK		 1529 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1530 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1531 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1532 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1533 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1534 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1535 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1536 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1537#endif
1538
1539 regs->rip = vcpu->rip;
1540 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1541
1542 /*
1543 * Don't leak debug flags in case they were set for guest debugging
1544 */
1545 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1546 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1547
1548 vcpu_put(vcpu);
1549
1550 return 0;
1551}
1552
1553static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1554{
1555 struct kvm_vcpu *vcpu;
1556
5aacf0ca 1557 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1558 return -EINVAL;
1559
1560 vcpu = vcpu_load(kvm, regs->vcpu);
1561 if (!vcpu)
1562 return -ENOENT;
1563
1564 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1565 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1566 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1567 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1568 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1569 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1570 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1571 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1572#ifdef CONFIG_X86_64
6aa8b732
AK		 1573 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1574 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1575 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1576 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1577 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1578 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1579 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1580 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1581#endif
1582
1583 vcpu->rip = regs->rip;
1584 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1585
1586 kvm_arch_ops->decache_regs(vcpu);
1587
1588 vcpu_put(vcpu);
1589
1590 return 0;
1591}
1592
1593static void get_segment(struct kvm_vcpu *vcpu,
1594 struct kvm_segment *var, int seg)
1595{
1596 return kvm_arch_ops->get_segment(vcpu, var, seg);
1597}
1598
1599static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1600{
1601 struct kvm_vcpu *vcpu;
1602 struct descriptor_table dt;
1603
5aacf0ca 1604 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1605 return -EINVAL;
1606 vcpu = vcpu_load(kvm, sregs->vcpu);
1607 if (!vcpu)
1608 return -ENOENT;
1609
1610 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1611 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1612 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1613 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1614 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1615 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1616
1617 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1618 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1619
1620 kvm_arch_ops->get_idt(vcpu, &dt);
1621 sregs->idt.limit = dt.limit;
1622 sregs->idt.base = dt.base;
1623 kvm_arch_ops->get_gdt(vcpu, &dt);
1624 sregs->gdt.limit = dt.limit;
1625 sregs->gdt.base = dt.base;
1626
399badf3 1627 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1628 sregs->cr0 = vcpu->cr0;
1629 sregs->cr2 = vcpu->cr2;
1630 sregs->cr3 = vcpu->cr3;
1631 sregs->cr4 = vcpu->cr4;
1632 sregs->cr8 = vcpu->cr8;
1633 sregs->efer = vcpu->shadow_efer;
1634 sregs->apic_base = vcpu->apic_base;
1635
1636 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1637 sizeof sregs->interrupt_bitmap);
1638
1639 vcpu_put(vcpu);
1640
1641 return 0;
1642}
1643
1644static void set_segment(struct kvm_vcpu *vcpu,
1645 struct kvm_segment *var, int seg)
1646{
1647 return kvm_arch_ops->set_segment(vcpu, var, seg);
1648}
1649
1650static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1651{
1652 struct kvm_vcpu *vcpu;
1653 int mmu_reset_needed = 0;
1654 int i;
1655 struct descriptor_table dt;
1656
5aacf0ca 1657 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1658 return -EINVAL;
1659 vcpu = vcpu_load(kvm, sregs->vcpu);
1660 if (!vcpu)
1661 return -ENOENT;
1662
1663 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1664 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1665 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1666 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1667 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1668 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1669
1670 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1671 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1672
1673 dt.limit = sregs->idt.limit;
1674 dt.base = sregs->idt.base;
1675 kvm_arch_ops->set_idt(vcpu, &dt);
1676 dt.limit = sregs->gdt.limit;
1677 dt.base = sregs->gdt.base;
1678 kvm_arch_ops->set_gdt(vcpu, &dt);
1679
1680 vcpu->cr2 = sregs->cr2;
1681 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1682 vcpu->cr3 = sregs->cr3;
1683
1684 vcpu->cr8 = sregs->cr8;
1685
1686 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 1687#ifdef CONFIG_X86_64
6aa8b732
AK		 1688 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1689#endif
1690 vcpu->apic_base = sregs->apic_base;
1691
399badf3
AK		 1692 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1693
6aa8b732
AK		 1694 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1695 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1696
1697 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1698 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 1699 if (!is_long_mode(vcpu) && is_pae(vcpu))
1700 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 1701
1702 if (mmu_reset_needed)
1703 kvm_mmu_reset_context(vcpu);
1704
1705 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1706 sizeof vcpu->irq_pending);
1707 vcpu->irq_summary = 0;
1708 for (i = 0; i < NR_IRQ_WORDS; ++i)
1709 if (vcpu->irq_pending[i])
1710 __set_bit(i, &vcpu->irq_summary);
1711
1712 vcpu_put(vcpu);
1713
1714 return 0;
1715}
1716
1717/*
1718 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1719 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 1720 *
1721 * This list is modified at module load time to reflect the
1722 * capabilities of the host cpu.
6aa8b732
AK		 1723 */
1724static u32 msrs_to_save[] = {
1725 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1726 MSR_K6_STAR,
05b3e0c2 1727#ifdef CONFIG_X86_64
6aa8b732
AK		 1728 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1729#endif
1730 MSR_IA32_TIME_STAMP_COUNTER,
1731};
1732
bf591b24
MR		 1733static unsigned num_msrs_to_save;
1734
6f00e68f
AK		 1735static u32 emulated_msrs[] = {
1736 MSR_IA32_MISC_ENABLE,
1737};
1738
bf591b24
MR		 1739static __init void kvm_init_msr_list(void)
1740{
1741 u32 dummy[2];
1742 unsigned i, j;
1743
1744 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1745 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1746 continue;
1747 if (j < i)
1748 msrs_to_save[j] = msrs_to_save[i];
1749 j++;
1750 }
1751 num_msrs_to_save = j;
1752}
6aa8b732
AK		 1753
1754/*
1755 * Adapt set_msr() to msr_io()'s calling convention
1756 */
1757static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1758{
1759 return set_msr(vcpu, index, *data);
1760}
1761
1762/*
1763 * Read or write a bunch of msrs. All parameters are kernel addresses.
1764 *
1765 * @return number of msrs set successfully.
1766 */
1767static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1768 struct kvm_msr_entry *entries,
1769 int (*do_msr)(struct kvm_vcpu *vcpu,
1770 unsigned index, u64 *data))
1771{
1772 struct kvm_vcpu *vcpu;
1773 int i;
1774
5aacf0ca 1775 if (!valid_vcpu(msrs->vcpu))
6aa8b732
AK		 1776 return -EINVAL;
1777
1778 vcpu = vcpu_load(kvm, msrs->vcpu);
1779 if (!vcpu)
1780 return -ENOENT;
1781
1782 for (i = 0; i < msrs->nmsrs; ++i)
1783 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1784 break;
1785
1786 vcpu_put(vcpu);
1787
1788 return i;
1789}
1790
1791/*
1792 * Read or write a bunch of msrs. Parameters are user addresses.
1793 *
1794 * @return number of msrs set successfully.
1795 */
1796static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1797 int (*do_msr)(struct kvm_vcpu *vcpu,
1798 unsigned index, u64 *data),
1799 int writeback)
1800{
1801 struct kvm_msrs msrs;
1802 struct kvm_msr_entry *entries;
1803 int r, n;
1804 unsigned size;
1805
1806 r = -EFAULT;
1807 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1808 goto out;
1809
1810 r = -E2BIG;
1811 if (msrs.nmsrs >= MAX_IO_MSRS)
1812 goto out;
1813
1814 r = -ENOMEM;
1815 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1816 entries = vmalloc(size);
1817 if (!entries)
1818 goto out;
1819
1820 r = -EFAULT;
1821 if (copy_from_user(entries, user_msrs->entries, size))
1822 goto out_free;
1823
1824 r = n = __msr_io(kvm, &msrs, entries, do_msr);
1825 if (r < 0)
1826 goto out_free;
1827
1828 r = -EFAULT;
1829 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1830 goto out_free;
1831
1832 r = n;
1833
1834out_free:
1835 vfree(entries);
1836out:
1837 return r;
1838}
1839
1840/*
1841 * Translate a guest virtual address to a guest physical address.
1842 */
1843static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1844{
1845 unsigned long vaddr = tr->linear_address;
1846 struct kvm_vcpu *vcpu;
1847 gpa_t gpa;
1848
1849 vcpu = vcpu_load(kvm, tr->vcpu);
1850 if (!vcpu)
1851 return -ENOENT;
1852 spin_lock(&kvm->lock);
1853 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1854 tr->physical_address = gpa;
1855 tr->valid = gpa != UNMAPPED_GVA;
1856 tr->writeable = 1;
1857 tr->usermode = 0;
1858 spin_unlock(&kvm->lock);
1859 vcpu_put(vcpu);
1860
1861 return 0;
1862}
1863
1864static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1865{
1866 struct kvm_vcpu *vcpu;
1867
5aacf0ca 1868 if (!valid_vcpu(irq->vcpu))
6aa8b732
AK		 1869 return -EINVAL;
1870 if (irq->irq < 0 || irq->irq >= 256)
1871 return -EINVAL;
1872 vcpu = vcpu_load(kvm, irq->vcpu);
1873 if (!vcpu)
1874 return -ENOENT;
1875
1876 set_bit(irq->irq, vcpu->irq_pending);
1877 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1878
1879 vcpu_put(vcpu);
1880
1881 return 0;
1882}
1883
1884static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1885 struct kvm_debug_guest *dbg)
1886{
1887 struct kvm_vcpu *vcpu;
1888 int r;
1889
5aacf0ca 1890 if (!valid_vcpu(dbg->vcpu))
6aa8b732
AK		 1891 return -EINVAL;
1892 vcpu = vcpu_load(kvm, dbg->vcpu);
1893 if (!vcpu)
1894 return -ENOENT;
1895
1896 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1897
1898 vcpu_put(vcpu);
1899
1900 return r;
1901}
1902
1903static long kvm_dev_ioctl(struct file *filp,
1904 unsigned int ioctl, unsigned long arg)
1905{
1906 struct kvm *kvm = filp->private_data;
2f366987 1907 void __user *argp = (void __user *)arg;
6aa8b732
AK		 1908 int r = -EINVAL;
1909
1910 switch (ioctl) {
0b76e20b
AK		 1911 case KVM_GET_API_VERSION:
1912 r = KVM_API_VERSION;
1913 break;
d27d4aca 1914 case KVM_CREATE_VCPU:
6aa8b732
AK		 1915 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1916 if (r)
1917 goto out;
1918 break;
6aa8b732
AK		 1919 case KVM_RUN: {
1920 struct kvm_run kvm_run;
1921
1922 r = -EFAULT;
2f366987 1923 if (copy_from_user(&kvm_run, argp, sizeof kvm_run))
6aa8b732
AK		 1924 goto out;
1925 r = kvm_dev_ioctl_run(kvm, &kvm_run);
c1150d8c 1926 if (r < 0 && r != -EINTR)
6aa8b732 1927 goto out;
2f366987 1928 if (copy_to_user(argp, &kvm_run, sizeof kvm_run)) {
c1150d8c 1929 r = -EFAULT;
6aa8b732 1930 goto out;
c1150d8c 1931 }
6aa8b732
AK		 1932 break;
1933 }
1934 case KVM_GET_REGS: {
1935 struct kvm_regs kvm_regs;
1936
1937 r = -EFAULT;
2f366987 1938 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732
AK		 1939 goto out;
1940 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
1941 if (r)
1942 goto out;
1943 r = -EFAULT;
2f366987 1944 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 1945 goto out;
1946 r = 0;
1947 break;
1948 }
1949 case KVM_SET_REGS: {
1950 struct kvm_regs kvm_regs;
1951
1952 r = -EFAULT;
2f366987 1953 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732
AK		 1954 goto out;
1955 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
1956 if (r)
1957 goto out;
1958 r = 0;
1959 break;
1960 }
1961 case KVM_GET_SREGS: {
1962 struct kvm_sregs kvm_sregs;
1963
1964 r = -EFAULT;
2f366987 1965 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732
AK		 1966 goto out;
1967 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
1968 if (r)
1969 goto out;
1970 r = -EFAULT;
2f366987 1971 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 1972 goto out;
1973 r = 0;
1974 break;
1975 }
1976 case KVM_SET_SREGS: {
1977 struct kvm_sregs kvm_sregs;
1978
1979 r = -EFAULT;
2f366987 1980 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732
AK		 1981 goto out;
1982 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
1983 if (r)
1984 goto out;
1985 r = 0;
1986 break;
1987 }
1988 case KVM_TRANSLATE: {
1989 struct kvm_translation tr;
1990
1991 r = -EFAULT;
2f366987 1992 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732
AK		 1993 goto out;
1994 r = kvm_dev_ioctl_translate(kvm, &tr);
1995 if (r)
1996 goto out;
1997 r = -EFAULT;
2f366987 1998 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 1999 goto out;
2000 r = 0;
2001 break;
2002 }
2003 case KVM_INTERRUPT: {
2004 struct kvm_interrupt irq;
2005
2006 r = -EFAULT;
2f366987 2007 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732
AK		 2008 goto out;
2009 r = kvm_dev_ioctl_interrupt(kvm, &irq);
2010 if (r)
2011 goto out;
2012 r = 0;
2013 break;
2014 }
2015 case KVM_DEBUG_GUEST: {
2016 struct kvm_debug_guest dbg;
2017
2018 r = -EFAULT;
2f366987 2019 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732
AK		 2020 goto out;
2021 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
2022 if (r)
2023 goto out;
2024 r = 0;
2025 break;
2026 }
2027 case KVM_SET_MEMORY_REGION: {
2028 struct kvm_memory_region kvm_mem;
2029
2030 r = -EFAULT;
2f366987 2031 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
6aa8b732
AK		 2032 goto out;
2033 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
2034 if (r)
2035 goto out;
2036 break;
2037 }
2038 case KVM_GET_DIRTY_LOG: {
2039 struct kvm_dirty_log log;
2040
2041 r = -EFAULT;
2f366987 2042 if (copy_from_user(&log, argp, sizeof log))
6aa8b732
AK		 2043 goto out;
2044 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
2045 if (r)
2046 goto out;
2047 break;
2048 }
2049 case KVM_GET_MSRS:
2f366987 2050 r = msr_io(kvm, argp, get_msr, 1);
6aa8b732
AK		 2051 break;
2052 case KVM_SET_MSRS:
2f366987 2053 r = msr_io(kvm, argp, do_set_msr, 0);
6aa8b732
AK		 2054 break;
2055 case KVM_GET_MSR_INDEX_LIST: {
2f366987 2056 struct kvm_msr_list __user *user_msr_list = argp;
6aa8b732
AK		 2057 struct kvm_msr_list msr_list;
2058 unsigned n;
2059
2060 r = -EFAULT;
2061 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2062 goto out;
2063 n = msr_list.nmsrs;
6f00e68f 2064 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
6aa8b732
AK		 2065 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2066 goto out;
2067 r = -E2BIG;
bf591b24 2068 if (n < num_msrs_to_save)
6aa8b732
AK		 2069 goto out;
2070 r = -EFAULT;
2071 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 2072 num_msrs_to_save * sizeof(u32)))
6aa8b732 2073 goto out;
6f00e68f
AK		 2074 if (copy_to_user(user_msr_list->indices
2075 + num_msrs_to_save * sizeof(u32),
2076 &emulated_msrs,
2077 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2078 goto out;
6aa8b732 2079 r = 0;
cc1d8955 2080 break;
6aa8b732
AK		 2081 }
2082 default:
2083 ;
2084 }
2085out:
2086 return r;
2087}
2088
2089static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
2090 unsigned long address,
2091 int *type)
2092{
2093 struct kvm *kvm = vma->vm_file->private_data;
2094 unsigned long pgoff;
2095 struct kvm_memory_slot *slot;
2096 struct page *page;
2097
2098 *type = VM_FAULT_MINOR;
2099 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2100 slot = gfn_to_memslot(kvm, pgoff);
2101 if (!slot)
2102 return NOPAGE_SIGBUS;
2103 page = gfn_to_page(slot, pgoff);
2104 if (!page)
2105 return NOPAGE_SIGBUS;
2106 get_page(page);
2107 return page;
2108}
2109
2110static struct vm_operations_struct kvm_dev_vm_ops = {
2111 .nopage = kvm_dev_nopage,
2112};
2113
2114static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
2115{
2116 vma->vm_ops = &kvm_dev_vm_ops;
2117 return 0;
2118}
2119
2120static struct file_operations kvm_chardev_ops = {
2121 .open = kvm_dev_open,
2122 .release = kvm_dev_release,
2123 .unlocked_ioctl = kvm_dev_ioctl,
2124 .compat_ioctl = kvm_dev_ioctl,
2125 .mmap = kvm_dev_mmap,
2126};
2127
2128static struct miscdevice kvm_dev = {
2129 MISC_DYNAMIC_MINOR,
2130 "kvm",
2131 &kvm_chardev_ops,
2132};
2133
2134static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2135 void *v)
2136{
2137 if (val == SYS_RESTART) {
2138 /*
2139 * Some (well, at least mine) BIOSes hang on reboot if
2140 * in vmx root mode.
2141 */
2142 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
8b6d44c7 2143 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2144 }
2145 return NOTIFY_OK;
2146}
2147
2148static struct notifier_block kvm_reboot_notifier = {
2149 .notifier_call = kvm_reboot,
2150 .priority = 0,
2151};
2152
774c47f1
AK		 2153/*
2154 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2155 * cached on it.
2156 */
2157static void decache_vcpus_on_cpu(int cpu)
2158{
2159 struct kvm *vm;
2160 struct kvm_vcpu *vcpu;
2161 int i;
2162
2163 spin_lock(&kvm_lock);
2164 list_for_each_entry(vm, &vm_list, vm_list)
2165 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2166 vcpu = &vm->vcpus[i];
2167 /*
2168 * If the vcpu is locked, then it is running on some
2169 * other cpu and therefore it is not cached on the
2170 * cpu in question.
2171 *
2172 * If it's not locked, check the last cpu it executed
2173 * on.
2174 */
2175 if (mutex_trylock(&vcpu->mutex)) {
2176 if (vcpu->cpu == cpu) {
2177 kvm_arch_ops->vcpu_decache(vcpu);
2178 vcpu->cpu = -1;
2179 }
2180 mutex_unlock(&vcpu->mutex);
2181 }
2182 }
2183 spin_unlock(&kvm_lock);
2184}
2185
2186static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2187 void *v)
2188{
2189 int cpu = (long)v;
2190
2191 switch (val) {
43934a38 2192 case CPU_DOWN_PREPARE:
774c47f1 2193 case CPU_UP_CANCELED:
43934a38
JK		 2194 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2195 cpu);
774c47f1
AK		 2196 decache_vcpus_on_cpu(cpu);
2197 smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
2198 NULL, 0, 1);
2199 break;
43934a38
JK		 2200 case CPU_ONLINE:
2201 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2202 cpu);
774c47f1
AK		 2203 smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
2204 NULL, 0, 1);
2205 break;
2206 }
2207 return NOTIFY_OK;
2208}
2209
2210static struct notifier_block kvm_cpu_notifier = {
2211 .notifier_call = kvm_cpu_hotplug,
2212 .priority = 20, /* must be > scheduler priority */
2213};
2214
6aa8b732
AK		 2215static __init void kvm_init_debug(void)
2216{
2217 struct kvm_stats_debugfs_item *p;
2218
8b6d44c7 2219 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732
AK		 2220 for (p = debugfs_entries; p->name; ++p)
2221 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
2222 p->data);
2223}
2224
2225static void kvm_exit_debug(void)
2226{
2227 struct kvm_stats_debugfs_item *p;
2228
2229 for (p = debugfs_entries; p->name; ++p)
2230 debugfs_remove(p->dentry);
2231 debugfs_remove(debugfs_dir);
2232}
2233
59ae6c6b
AK		 2234static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2235{
2236 decache_vcpus_on_cpu(raw_smp_processor_id());
19d1408d 2237 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
59ae6c6b
AK		 2238 return 0;
2239}
2240
2241static int kvm_resume(struct sys_device *dev)
2242{
19d1408d 2243 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
59ae6c6b
AK		 2244 return 0;
2245}
2246
2247static struct sysdev_class kvm_sysdev_class = {
2248 set_kset_name("kvm"),
2249 .suspend = kvm_suspend,
2250 .resume = kvm_resume,
2251};
2252
2253static struct sys_device kvm_sysdev = {
2254 .id = 0,
2255 .cls = &kvm_sysdev_class,
2256};
2257
6aa8b732
AK		 2258hpa_t bad_page_address;
2259
37e29d90
AK		 2260static int kvmfs_get_sb(struct file_system_type *fs_type, int flags,
2261 const char *dev_name, void *data, struct vfsmount *mnt)
2262{
2263 return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_MAGIC, mnt);
2264}
2265
2266static struct file_system_type kvm_fs_type = {
2267 .name = "kvmfs",
2268 .get_sb = kvmfs_get_sb,
2269 .kill_sb = kill_anon_super,
2270};
2271
6aa8b732
AK		 2272int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
2273{
2274 int r;
2275
09db28b8
YI		 2276 if (kvm_arch_ops) {
2277 printk(KERN_ERR "kvm: already loaded the other module\n");
2278 return -EEXIST;
2279 }
2280
e097f35c 2281 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 2282 printk(KERN_ERR "kvm: no hardware support\n");
2283 return -EOPNOTSUPP;
2284 }
e097f35c 2285 if (ops->disabled_by_bios()) {
6aa8b732
AK		 2286 printk(KERN_ERR "kvm: disabled by bios\n");
2287 return -EOPNOTSUPP;
2288 }
2289
e097f35c
YI		 2290 kvm_arch_ops = ops;
2291
6aa8b732
AK		 2292 r = kvm_arch_ops->hardware_setup();
2293 if (r < 0)
2294 return r;
2295
8b6d44c7 2296 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
774c47f1
AK		 2297 r = register_cpu_notifier(&kvm_cpu_notifier);
2298 if (r)
2299 goto out_free_1;
6aa8b732
AK		 2300 register_reboot_notifier(&kvm_reboot_notifier);
2301
59ae6c6b
AK		 2302 r = sysdev_class_register(&kvm_sysdev_class);
2303 if (r)
2304 goto out_free_2;
2305
2306 r = sysdev_register(&kvm_sysdev);
2307 if (r)
2308 goto out_free_3;
2309
6aa8b732
AK		 2310 kvm_chardev_ops.owner = module;
2311
2312 r = misc_register(&kvm_dev);
2313 if (r) {
2314 printk (KERN_ERR "kvm: misc device register failed\n");
2315 goto out_free;
2316 }
2317
2318 return r;
2319
2320out_free:
59ae6c6b
AK		 2321 sysdev_unregister(&kvm_sysdev);
2322out_free_3:
2323 sysdev_class_unregister(&kvm_sysdev_class);
2324out_free_2:
6aa8b732 2325 unregister_reboot_notifier(&kvm_reboot_notifier);
774c47f1
AK		 2326 unregister_cpu_notifier(&kvm_cpu_notifier);
2327out_free_1:
8b6d44c7 2328 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2329 kvm_arch_ops->hardware_unsetup();
2330 return r;
2331}
2332
2333void kvm_exit_arch(void)
2334{
2335 misc_deregister(&kvm_dev);
59ae6c6b
AK		 2336 sysdev_unregister(&kvm_sysdev);
2337 sysdev_class_unregister(&kvm_sysdev_class);
6aa8b732 2338 unregister_reboot_notifier(&kvm_reboot_notifier);
59ae6c6b 2339 unregister_cpu_notifier(&kvm_cpu_notifier);
8b6d44c7 2340 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 2341 kvm_arch_ops->hardware_unsetup();
09db28b8 2342 kvm_arch_ops = NULL;
6aa8b732
AK		 2343}
2344
2345static __init int kvm_init(void)
2346{
2347 static struct page *bad_page;
37e29d90
AK		 2348 int r;
2349
2350 r = register_filesystem(&kvm_fs_type);
2351 if (r)
2352 goto out3;
6aa8b732 2353
37e29d90
AK		 2354 kvmfs_mnt = kern_mount(&kvm_fs_type);
2355 r = PTR_ERR(kvmfs_mnt);
2356 if (IS_ERR(kvmfs_mnt))
2357 goto out2;
6aa8b732
AK		 2358 kvm_init_debug();
2359
bf591b24
MR		 2360 kvm_init_msr_list();
2361
6aa8b732
AK		 2362 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2363 r = -ENOMEM;
2364 goto out;
2365 }
2366
2367 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2368 memset(__va(bad_page_address), 0, PAGE_SIZE);
2369
2370 return r;
2371
2372out:
2373 kvm_exit_debug();
37e29d90
AK		 2374 mntput(kvmfs_mnt);
2375out2:
2376 unregister_filesystem(&kvm_fs_type);
2377out3:
6aa8b732
AK		 2378 return r;
2379}
2380
2381static __exit void kvm_exit(void)
2382{
2383 kvm_exit_debug();
2384 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
37e29d90
AK		 2385 mntput(kvmfs_mnt);
2386 unregister_filesystem(&kvm_fs_type);
6aa8b732
AK		 2387}
2388
2389module_init(kvm_init)
2390module_exit(kvm_exit)
2391
2392EXPORT_SYMBOL_GPL(kvm_init_arch);
2393EXPORT_SYMBOL_GPL(kvm_exit_arch);
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