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spidernet: remove txram full logging
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / kvm / kvm_main.c
blobaf866147ff25613ef1e1c4a7e0d0edccca0dc27a
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>
37 #include <linux/sysdev.h>
38 #include <linux/cpu.h>
39
40 #include "x86_emulate.h"
41 #include "segment_descriptor.h"
42
43 MODULE_AUTHOR("Qumranet");
44 MODULE_LICENSE("GPL");
45
46 static DEFINE_SPINLOCK(kvm_lock);
47 static LIST_HEAD(vm_list);
48
49 struct kvm_arch_ops *kvm_arch_ops;
50 struct kvm_stat kvm_stat;
51 EXPORT_SYMBOL_GPL(kvm_stat);
52
53 static struct kvm_stats_debugfs_item {
54 const char *name;
55 u32 *data;
56 struct dentry *dentry;
57 } debugfs_entries[] = {
58 { "pf_fixed", &kvm_stat.pf_fixed },
59 { "pf_guest", &kvm_stat.pf_guest },
60 { "tlb_flush", &kvm_stat.tlb_flush },
61 { "invlpg", &kvm_stat.invlpg },
62 { "exits", &kvm_stat.exits },
63 { "io_exits", &kvm_stat.io_exits },
64 { "mmio_exits", &kvm_stat.mmio_exits },
65 { "signal_exits", &kvm_stat.signal_exits },
66 { "irq_window", &kvm_stat.irq_window_exits },
67 { "halt_exits", &kvm_stat.halt_exits },
68 { "request_irq", &kvm_stat.request_irq_exits },
69 { "irq_exits", &kvm_stat.irq_exits },
70 { NULL, NULL }
71 };
72
73 static struct dentry *debugfs_dir;
74
75 #define MAX_IO_MSRS 256
76
77 #define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
78 #define LMSW_GUEST_MASK 0x0eULL
79 #define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
80 #define CR8_RESEVED_BITS (~0x0fULL)
81 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
82
83 #ifdef CONFIG_X86_64
84 // LDT or TSS descriptor in the GDT. 16 bytes.
85 struct segment_descriptor_64 {
86 struct segment_descriptor s;
87 u32 base_higher;
88 u32 pad_zero;
89 };
90
91 #endif
92
93 unsigned long segment_base(u16 selector)
94 {
95 struct descriptor_table gdt;
96 struct segment_descriptor *d;
97 unsigned long table_base;
98 typedef unsigned long ul;
99 unsigned long v;
100
101 if (selector == 0)
102 return 0;
103
104 asm ("sgdt %0" : "=m"(gdt));
105 table_base = gdt.base;
106
107 if (selector & 4) { /* from ldt */
108 u16 ldt_selector;
109
110 asm ("sldt %0" : "=g"(ldt_selector));
111 table_base = segment_base(ldt_selector);
112 }
113 d = (struct segment_descriptor *)(table_base + (selector & ~7));
114 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
115 #ifdef CONFIG_X86_64
116 if (d->system == 0
117 && (d->type == 2 || d->type == 9 || d->type == 11))
118 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
119 #endif
120 return v;
121 }
122 EXPORT_SYMBOL_GPL(segment_base);
123
124 static inline int valid_vcpu(int n)
125 {
126 return likely(n >= 0 && n < KVM_MAX_VCPUS);
127 }
128
129 int kvm_read_guest(struct kvm_vcpu *vcpu,
130 gva_t addr,
131 unsigned long size,
132 void *dest)
133 {
134 unsigned char *host_buf = dest;
135 unsigned long req_size = size;
136
137 while (size) {
138 hpa_t paddr;
139 unsigned now;
140 unsigned offset;
141 hva_t guest_buf;
142
143 paddr = gva_to_hpa(vcpu, addr);
144
145 if (is_error_hpa(paddr))
146 break;
147
148 guest_buf = (hva_t)kmap_atomic(
149 pfn_to_page(paddr >> PAGE_SHIFT),
150 KM_USER0);
151 offset = addr & ~PAGE_MASK;
152 guest_buf |= offset;
153 now = min(size, PAGE_SIZE - offset);
154 memcpy(host_buf, (void*)guest_buf, now);
155 host_buf += now;
156 addr += now;
157 size -= now;
158 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
159 }
160 return req_size - size;
161 }
162 EXPORT_SYMBOL_GPL(kvm_read_guest);
163
164 int kvm_write_guest(struct kvm_vcpu *vcpu,
165 gva_t addr,
166 unsigned long size,
167 void *data)
168 {
169 unsigned char *host_buf = data;
170 unsigned long req_size = size;
171
172 while (size) {
173 hpa_t paddr;
174 unsigned now;
175 unsigned offset;
176 hva_t guest_buf;
177
178 paddr = gva_to_hpa(vcpu, addr);
179
180 if (is_error_hpa(paddr))
181 break;
182
183 guest_buf = (hva_t)kmap_atomic(
184 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
185 offset = addr & ~PAGE_MASK;
186 guest_buf |= offset;
187 now = min(size, PAGE_SIZE - offset);
188 memcpy((void*)guest_buf, host_buf, now);
189 host_buf += now;
190 addr += now;
191 size -= now;
192 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
193 }
194 return req_size - size;
195 }
196 EXPORT_SYMBOL_GPL(kvm_write_guest);
197
198 static int vcpu_slot(struct kvm_vcpu *vcpu)
199 {
200 return vcpu - vcpu->kvm->vcpus;
201 }
202
203 /*
204 * Switches to specified vcpu, until a matching vcpu_put()
205 */
206 static struct kvm_vcpu *vcpu_load(struct kvm *kvm, int vcpu_slot)
207 {
208 struct kvm_vcpu *vcpu = &kvm->vcpus[vcpu_slot];
209
210 mutex_lock(&vcpu->mutex);
211 if (unlikely(!vcpu->vmcs)) {
212 mutex_unlock(&vcpu->mutex);
213 return NULL;
214 }
215 return kvm_arch_ops->vcpu_load(vcpu);
216 }
217
218 static void vcpu_put(struct kvm_vcpu *vcpu)
219 {
220 kvm_arch_ops->vcpu_put(vcpu);
221 mutex_unlock(&vcpu->mutex);
222 }
223
224 static int kvm_dev_open(struct inode *inode, struct file *filp)
225 {
226 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
227 int i;
228
229 if (!kvm)
230 return -ENOMEM;
231
232 spin_lock_init(&kvm->lock);
233 INIT_LIST_HEAD(&kvm->active_mmu_pages);
234 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
235 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
236
237 mutex_init(&vcpu->mutex);
238 vcpu->cpu = -1;
239 vcpu->kvm = kvm;
240 vcpu->mmu.root_hpa = INVALID_PAGE;
241 INIT_LIST_HEAD(&vcpu->free_pages);
242 spin_lock(&kvm_lock);
243 list_add(&kvm->vm_list, &vm_list);
244 spin_unlock(&kvm_lock);
245 }
246 filp->private_data = kvm;
247 return 0;
248 }
249
250 /*
251 * Free any memory in @free but not in @dont.
252 */
253 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
254 struct kvm_memory_slot *dont)
255 {
256 int i;
257
258 if (!dont || free->phys_mem != dont->phys_mem)
259 if (free->phys_mem) {
260 for (i = 0; i < free->npages; ++i)
261 if (free->phys_mem[i])
262 __free_page(free->phys_mem[i]);
263 vfree(free->phys_mem);
264 }
265
266 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
267 vfree(free->dirty_bitmap);
268
269 free->phys_mem = NULL;
270 free->npages = 0;
271 free->dirty_bitmap = NULL;
272 }
273
274 static void kvm_free_physmem(struct kvm *kvm)
275 {
276 int i;
277
278 for (i = 0; i < kvm->nmemslots; ++i)
279 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
280 }
281
282 static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
283 {
284 if (!vcpu_load(vcpu->kvm, vcpu_slot(vcpu)))
285 return;
286
287 kvm_mmu_destroy(vcpu);
288 vcpu_put(vcpu);
289 kvm_arch_ops->vcpu_free(vcpu);
290 }
291
292 static void kvm_free_vcpus(struct kvm *kvm)
293 {
294 unsigned int i;
295
296 for (i = 0; i < KVM_MAX_VCPUS; ++i)
297 kvm_free_vcpu(&kvm->vcpus[i]);
298 }
299
300 static int kvm_dev_release(struct inode *inode, struct file *filp)
301 {
302 struct kvm *kvm = filp->private_data;
303
304 spin_lock(&kvm_lock);
305 list_del(&kvm->vm_list);
306 spin_unlock(&kvm_lock);
307 kvm_free_vcpus(kvm);
308 kvm_free_physmem(kvm);
309 kfree(kvm);
310 return 0;
311 }
312
313 static void inject_gp(struct kvm_vcpu *vcpu)
314 {
315 kvm_arch_ops->inject_gp(vcpu, 0);
316 }
317
318 /*
319 * Load the pae pdptrs. Return true is they are all valid.
320 */
321 static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
322 {
323 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
324 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
325 int i;
326 u64 pdpte;
327 u64 *pdpt;
328 int ret;
329 struct kvm_memory_slot *memslot;
330
331 spin_lock(&vcpu->kvm->lock);
332 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
333 /* FIXME: !memslot - emulate? 0xff? */
334 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
335
336 ret = 1;
337 for (i = 0; i < 4; ++i) {
338 pdpte = pdpt[offset + i];
339 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
340 ret = 0;
341 goto out;
342 }
343 }
344
345 for (i = 0; i < 4; ++i)
346 vcpu->pdptrs[i] = pdpt[offset + i];
347
348 out:
349 kunmap_atomic(pdpt, KM_USER0);
350 spin_unlock(&vcpu->kvm->lock);
351
352 return ret;
353 }
354
355 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
356 {
357 if (cr0 & CR0_RESEVED_BITS) {
358 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
359 cr0, vcpu->cr0);
360 inject_gp(vcpu);
361 return;
362 }
363
364 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
365 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
366 inject_gp(vcpu);
367 return;
368 }
369
370 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
371 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
372 "and a clear PE flag\n");
373 inject_gp(vcpu);
374 return;
375 }
376
377 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
378 #ifdef CONFIG_X86_64
379 if ((vcpu->shadow_efer & EFER_LME)) {
380 int cs_db, cs_l;
381
382 if (!is_pae(vcpu)) {
383 printk(KERN_DEBUG "set_cr0: #GP, start paging "
384 "in long mode while PAE is disabled\n");
385 inject_gp(vcpu);
386 return;
387 }
388 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
389 if (cs_l) {
390 printk(KERN_DEBUG "set_cr0: #GP, start paging "
391 "in long mode while CS.L == 1\n");
392 inject_gp(vcpu);
393 return;
394
395 }
396 } else
397 #endif
398 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
399 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
400 "reserved bits\n");
401 inject_gp(vcpu);
402 return;
403 }
404
405 }
406
407 kvm_arch_ops->set_cr0(vcpu, cr0);
408 vcpu->cr0 = cr0;
409
410 spin_lock(&vcpu->kvm->lock);
411 kvm_mmu_reset_context(vcpu);
412 spin_unlock(&vcpu->kvm->lock);
413 return;
414 }
415 EXPORT_SYMBOL_GPL(set_cr0);
416
417 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
418 {
419 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
420 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
421 }
422 EXPORT_SYMBOL_GPL(lmsw);
423
424 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
425 {
426 if (cr4 & CR4_RESEVED_BITS) {
427 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
428 inject_gp(vcpu);
429 return;
430 }
431
432 if (is_long_mode(vcpu)) {
433 if (!(cr4 & CR4_PAE_MASK)) {
434 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
435 "in long mode\n");
436 inject_gp(vcpu);
437 return;
438 }
439 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
440 && !load_pdptrs(vcpu, vcpu->cr3)) {
441 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
442 inject_gp(vcpu);
443 }
444
445 if (cr4 & CR4_VMXE_MASK) {
446 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
447 inject_gp(vcpu);
448 return;
449 }
450 kvm_arch_ops->set_cr4(vcpu, cr4);
451 spin_lock(&vcpu->kvm->lock);
452 kvm_mmu_reset_context(vcpu);
453 spin_unlock(&vcpu->kvm->lock);
454 }
455 EXPORT_SYMBOL_GPL(set_cr4);
456
457 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
458 {
459 if (is_long_mode(vcpu)) {
460 if ( cr3 & CR3_L_MODE_RESEVED_BITS) {
461 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
462 inject_gp(vcpu);
463 return;
464 }
465 } else {
466 if (cr3 & CR3_RESEVED_BITS) {
467 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
468 inject_gp(vcpu);
469 return;
470 }
471 if (is_paging(vcpu) && is_pae(vcpu) &&
472 !load_pdptrs(vcpu, cr3)) {
473 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
474 "reserved bits\n");
475 inject_gp(vcpu);
476 return;
477 }
478 }
479
480 vcpu->cr3 = cr3;
481 spin_lock(&vcpu->kvm->lock);
482 /*
483 * Does the new cr3 value map to physical memory? (Note, we
484 * catch an invalid cr3 even in real-mode, because it would
485 * cause trouble later on when we turn on paging anyway.)
486 *
487 * A real CPU would silently accept an invalid cr3 and would
488 * attempt to use it - with largely undefined (and often hard
489 * to debug) behavior on the guest side.
490 */
491 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
492 inject_gp(vcpu);
493 else
494 vcpu->mmu.new_cr3(vcpu);
495 spin_unlock(&vcpu->kvm->lock);
496 }
497 EXPORT_SYMBOL_GPL(set_cr3);
498
499 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
500 {
501 if ( cr8 & CR8_RESEVED_BITS) {
502 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
503 inject_gp(vcpu);
504 return;
505 }
506 vcpu->cr8 = cr8;
507 }
508 EXPORT_SYMBOL_GPL(set_cr8);
509
510 void fx_init(struct kvm_vcpu *vcpu)
511 {
512 struct __attribute__ ((__packed__)) fx_image_s {
513 u16 control; //fcw
514 u16 status; //fsw
515 u16 tag; // ftw
516 u16 opcode; //fop
517 u64 ip; // fpu ip
518 u64 operand;// fpu dp
519 u32 mxcsr;
520 u32 mxcsr_mask;
521
522 } *fx_image;
523
524 fx_save(vcpu->host_fx_image);
525 fpu_init();
526 fx_save(vcpu->guest_fx_image);
527 fx_restore(vcpu->host_fx_image);
528
529 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
530 fx_image->mxcsr = 0x1f80;
531 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
532 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
533 }
534 EXPORT_SYMBOL_GPL(fx_init);
535
536 /*
537 * Creates some virtual cpus. Good luck creating more than one.
538 */
539 static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
540 {
541 int r;
542 struct kvm_vcpu *vcpu;
543
544 r = -EINVAL;
545 if (!valid_vcpu(n))
546 goto out;
547
548 vcpu = &kvm->vcpus[n];
549
550 mutex_lock(&vcpu->mutex);
551
552 if (vcpu->vmcs) {
553 mutex_unlock(&vcpu->mutex);
554 return -EEXIST;
555 }
556
557 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
558 FX_IMAGE_ALIGN);
559 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
560
561 r = kvm_arch_ops->vcpu_create(vcpu);
562 if (r < 0)
563 goto out_free_vcpus;
564
565 r = kvm_mmu_create(vcpu);
566 if (r < 0)
567 goto out_free_vcpus;
568
569 kvm_arch_ops->vcpu_load(vcpu);
570 r = kvm_mmu_setup(vcpu);
571 if (r >= 0)
572 r = kvm_arch_ops->vcpu_setup(vcpu);
573 vcpu_put(vcpu);
574
575 if (r < 0)
576 goto out_free_vcpus;
577
578 return 0;
579
580 out_free_vcpus:
581 kvm_free_vcpu(vcpu);
582 mutex_unlock(&vcpu->mutex);
583 out:
584 return r;
585 }
586
587 /*
588 * Allocate some memory and give it an address in the guest physical address
589 * space.
590 *
591 * Discontiguous memory is allowed, mostly for framebuffers.
592 */
593 static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm,
594 struct kvm_memory_region *mem)
595 {
596 int r;
597 gfn_t base_gfn;
598 unsigned long npages;
599 unsigned long i;
600 struct kvm_memory_slot *memslot;
601 struct kvm_memory_slot old, new;
602 int memory_config_version;
603
604 r = -EINVAL;
605 /* General sanity checks */
606 if (mem->memory_size & (PAGE_SIZE - 1))
607 goto out;
608 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
609 goto out;
610 if (mem->slot >= KVM_MEMORY_SLOTS)
611 goto out;
612 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
613 goto out;
614
615 memslot = &kvm->memslots[mem->slot];
616 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
617 npages = mem->memory_size >> PAGE_SHIFT;
618
619 if (!npages)
620 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
621
622 raced:
623 spin_lock(&kvm->lock);
624
625 memory_config_version = kvm->memory_config_version;
626 new = old = *memslot;
627
628 new.base_gfn = base_gfn;
629 new.npages = npages;
630 new.flags = mem->flags;
631
632 /* Disallow changing a memory slot's size. */
633 r = -EINVAL;
634 if (npages && old.npages && npages != old.npages)
635 goto out_unlock;
636
637 /* Check for overlaps */
638 r = -EEXIST;
639 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
640 struct kvm_memory_slot *s = &kvm->memslots[i];
641
642 if (s == memslot)
643 continue;
644 if (!((base_gfn + npages <= s->base_gfn) ||
645 (base_gfn >= s->base_gfn + s->npages)))
646 goto out_unlock;
647 }
648 /*
649 * Do memory allocations outside lock. memory_config_version will
650 * detect any races.
651 */
652 spin_unlock(&kvm->lock);
653
654 /* Deallocate if slot is being removed */
655 if (!npages)
656 new.phys_mem = NULL;
657
658 /* Free page dirty bitmap if unneeded */
659 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
660 new.dirty_bitmap = NULL;
661
662 r = -ENOMEM;
663
664 /* Allocate if a slot is being created */
665 if (npages && !new.phys_mem) {
666 new.phys_mem = vmalloc(npages * sizeof(struct page *));
667
668 if (!new.phys_mem)
669 goto out_free;
670
671 memset(new.phys_mem, 0, npages * sizeof(struct page *));
672 for (i = 0; i < npages; ++i) {
673 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
674 | __GFP_ZERO);
675 if (!new.phys_mem[i])
676 goto out_free;
677 new.phys_mem[i]->private = 0;
678 }
679 }
680
681 /* Allocate page dirty bitmap if needed */
682 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
683 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
684
685 new.dirty_bitmap = vmalloc(dirty_bytes);
686 if (!new.dirty_bitmap)
687 goto out_free;
688 memset(new.dirty_bitmap, 0, dirty_bytes);
689 }
690
691 spin_lock(&kvm->lock);
692
693 if (memory_config_version != kvm->memory_config_version) {
694 spin_unlock(&kvm->lock);
695 kvm_free_physmem_slot(&new, &old);
696 goto raced;
697 }
698
699 r = -EAGAIN;
700 if (kvm->busy)
701 goto out_unlock;
702
703 if (mem->slot >= kvm->nmemslots)
704 kvm->nmemslots = mem->slot + 1;
705
706 *memslot = new;
707 ++kvm->memory_config_version;
708
709 spin_unlock(&kvm->lock);
710
711 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
712 struct kvm_vcpu *vcpu;
713
714 vcpu = vcpu_load(kvm, i);
715 if (!vcpu)
716 continue;
717 kvm_mmu_reset_context(vcpu);
718 vcpu_put(vcpu);
719 }
720
721 kvm_free_physmem_slot(&old, &new);
722 return 0;
723
724 out_unlock:
725 spin_unlock(&kvm->lock);
726 out_free:
727 kvm_free_physmem_slot(&new, &old);
728 out:
729 return r;
730 }
731
732 static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
733 {
734 spin_lock(&vcpu->kvm->lock);
735 kvm_mmu_slot_remove_write_access(vcpu, slot);
736 spin_unlock(&vcpu->kvm->lock);
737 }
738
739 /*
740 * Get (and clear) the dirty memory log for a memory slot.
741 */
742 static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
743 struct kvm_dirty_log *log)
744 {
745 struct kvm_memory_slot *memslot;
746 int r, i;
747 int n;
748 int cleared;
749 unsigned long any = 0;
750
751 spin_lock(&kvm->lock);
752
753 /*
754 * Prevent changes to guest memory configuration even while the lock
755 * is not taken.
756 */
757 ++kvm->busy;
758 spin_unlock(&kvm->lock);
759 r = -EINVAL;
760 if (log->slot >= KVM_MEMORY_SLOTS)
761 goto out;
762
763 memslot = &kvm->memslots[log->slot];
764 r = -ENOENT;
765 if (!memslot->dirty_bitmap)
766 goto out;
767
768 n = ALIGN(memslot->npages, 8) / 8;
769
770 for (i = 0; !any && i < n; ++i)
771 any = memslot->dirty_bitmap[i];
772
773 r = -EFAULT;
774 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
775 goto out;
776
777
778 if (any) {
779 cleared = 0;
780 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
781 struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
782
783 if (!vcpu)
784 continue;
785 if (!cleared) {
786 do_remove_write_access(vcpu, log->slot);
787 memset(memslot->dirty_bitmap, 0, n);
788 cleared = 1;
789 }
790 kvm_arch_ops->tlb_flush(vcpu);
791 vcpu_put(vcpu);
792 }
793 }
794
795 r = 0;
796
797 out:
798 spin_lock(&kvm->lock);
799 --kvm->busy;
800 spin_unlock(&kvm->lock);
801 return r;
802 }
803
804 struct 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 }
815 return NULL;
816 }
817 EXPORT_SYMBOL_GPL(gfn_to_memslot);
818
819 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
820 {
821 int i;
822 struct kvm_memory_slot *memslot = NULL;
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
844 static 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
880 static 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
890 static 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);
906 if (gpa == UNMAPPED_GVA)
907 return vcpu_printf(vcpu, "not present\n"), X86EMUL_PROPAGATE_FAULT;
908 vcpu->mmio_needed = 1;
909 vcpu->mmio_phys_addr = gpa;
910 vcpu->mmio_size = bytes;
911 vcpu->mmio_is_write = 0;
912
913 return X86EMUL_UNHANDLEABLE;
914 }
915 }
916
917 static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
918 unsigned long val, int bytes)
919 {
920 struct kvm_memory_slot *m;
921 struct page *page;
922 void *virt;
923
924 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
925 return 0;
926 m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
927 if (!m)
928 return 0;
929 page = gfn_to_page(m, gpa >> PAGE_SHIFT);
930 kvm_mmu_pre_write(vcpu, gpa, bytes);
931 virt = kmap_atomic(page, KM_USER0);
932 memcpy(virt + offset_in_page(gpa), &val, bytes);
933 kunmap_atomic(virt, KM_USER0);
934 kvm_mmu_post_write(vcpu, gpa, bytes);
935 return 1;
936 }
937
938 static int emulator_write_emulated(unsigned long addr,
939 unsigned long val,
940 unsigned int bytes,
941 struct x86_emulate_ctxt *ctxt)
942 {
943 struct kvm_vcpu *vcpu = ctxt->vcpu;
944 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
945
946 if (gpa == UNMAPPED_GVA)
947 return X86EMUL_PROPAGATE_FAULT;
948
949 if (emulator_write_phys(vcpu, gpa, val, bytes))
950 return X86EMUL_CONTINUE;
951
952 vcpu->mmio_needed = 1;
953 vcpu->mmio_phys_addr = gpa;
954 vcpu->mmio_size = bytes;
955 vcpu->mmio_is_write = 1;
956 memcpy(vcpu->mmio_data, &val, bytes);
957
958 return X86EMUL_CONTINUE;
959 }
960
961 static int emulator_cmpxchg_emulated(unsigned long addr,
962 unsigned long old,
963 unsigned long new,
964 unsigned int bytes,
965 struct x86_emulate_ctxt *ctxt)
966 {
967 static int reported;
968
969 if (!reported) {
970 reported = 1;
971 printk(KERN_WARNING "kvm: emulating exchange as write\n");
972 }
973 return emulator_write_emulated(addr, new, bytes, ctxt);
974 }
975
976 #ifdef CONFIG_X86_32
977
978 static int emulator_cmpxchg8b_emulated(unsigned long addr,
979 unsigned long old_lo,
980 unsigned long old_hi,
981 unsigned long new_lo,
982 unsigned long new_hi,
983 struct x86_emulate_ctxt *ctxt)
984 {
985 static int reported;
986 int r;
987
988 if (!reported) {
989 reported = 1;
990 printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
991 }
992 r = emulator_write_emulated(addr, new_lo, 4, ctxt);
993 if (r != X86EMUL_CONTINUE)
994 return r;
995 return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
996 }
997
998 #endif
999
1000 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1001 {
1002 return kvm_arch_ops->get_segment_base(vcpu, seg);
1003 }
1004
1005 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1006 {
1007 return X86EMUL_CONTINUE;
1008 }
1009
1010 int emulate_clts(struct kvm_vcpu *vcpu)
1011 {
1012 unsigned long cr0;
1013
1014 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1015 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
1016 kvm_arch_ops->set_cr0(vcpu, cr0);
1017 return X86EMUL_CONTINUE;
1018 }
1019
1020 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1021 {
1022 struct kvm_vcpu *vcpu = ctxt->vcpu;
1023
1024 switch (dr) {
1025 case 0 ... 3:
1026 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1027 return X86EMUL_CONTINUE;
1028 default:
1029 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1030 __FUNCTION__, dr);
1031 return X86EMUL_UNHANDLEABLE;
1032 }
1033 }
1034
1035 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1036 {
1037 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1038 int exception;
1039
1040 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1041 if (exception) {
1042 /* FIXME: better handling */
1043 return X86EMUL_UNHANDLEABLE;
1044 }
1045 return X86EMUL_CONTINUE;
1046 }
1047
1048 static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1049 {
1050 static int reported;
1051 u8 opcodes[4];
1052 unsigned long rip = ctxt->vcpu->rip;
1053 unsigned long rip_linear;
1054
1055 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1056
1057 if (reported)
1058 return;
1059
1060 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1061
1062 printk(KERN_ERR "emulation failed but !mmio_needed?"
1063 " rip %lx %02x %02x %02x %02x\n",
1064 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1065 reported = 1;
1066 }
1067
1068 struct x86_emulate_ops emulate_ops = {
1069 .read_std = emulator_read_std,
1070 .write_std = emulator_write_std,
1071 .read_emulated = emulator_read_emulated,
1072 .write_emulated = emulator_write_emulated,
1073 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1074 #ifdef CONFIG_X86_32
1075 .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated,
1076 #endif
1077 };
1078
1079 int emulate_instruction(struct kvm_vcpu *vcpu,
1080 struct kvm_run *run,
1081 unsigned long cr2,
1082 u16 error_code)
1083 {
1084 struct x86_emulate_ctxt emulate_ctxt;
1085 int r;
1086 int cs_db, cs_l;
1087
1088 kvm_arch_ops->cache_regs(vcpu);
1089
1090 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1091
1092 emulate_ctxt.vcpu = vcpu;
1093 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1094 emulate_ctxt.cr2 = cr2;
1095 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1096 ? X86EMUL_MODE_REAL : cs_l
1097 ? X86EMUL_MODE_PROT64 : cs_db
1098 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1099
1100 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1101 emulate_ctxt.cs_base = 0;
1102 emulate_ctxt.ds_base = 0;
1103 emulate_ctxt.es_base = 0;
1104 emulate_ctxt.ss_base = 0;
1105 } else {
1106 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1107 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1108 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1109 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1110 }
1111
1112 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1113 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1114
1115 vcpu->mmio_is_write = 0;
1116 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1117
1118 if ((r || vcpu->mmio_is_write) && run) {
1119 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1120 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1121 run->mmio.len = vcpu->mmio_size;
1122 run->mmio.is_write = vcpu->mmio_is_write;
1123 }
1124
1125 if (r) {
1126 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1127 return EMULATE_DONE;
1128 if (!vcpu->mmio_needed) {
1129 report_emulation_failure(&emulate_ctxt);
1130 return EMULATE_FAIL;
1131 }
1132 return EMULATE_DO_MMIO;
1133 }
1134
1135 kvm_arch_ops->decache_regs(vcpu);
1136 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1137
1138 if (vcpu->mmio_is_write)
1139 return EMULATE_DO_MMIO;
1140
1141 return EMULATE_DONE;
1142 }
1143 EXPORT_SYMBOL_GPL(emulate_instruction);
1144
1145 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1146 {
1147 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1148 }
1149
1150 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1151 {
1152 struct descriptor_table dt = { limit, base };
1153
1154 kvm_arch_ops->set_gdt(vcpu, &dt);
1155 }
1156
1157 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1158 {
1159 struct descriptor_table dt = { limit, base };
1160
1161 kvm_arch_ops->set_idt(vcpu, &dt);
1162 }
1163
1164 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1165 unsigned long *rflags)
1166 {
1167 lmsw(vcpu, msw);
1168 *rflags = kvm_arch_ops->get_rflags(vcpu);
1169 }
1170
1171 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1172 {
1173 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1174 switch (cr) {
1175 case 0:
1176 return vcpu->cr0;
1177 case 2:
1178 return vcpu->cr2;
1179 case 3:
1180 return vcpu->cr3;
1181 case 4:
1182 return vcpu->cr4;
1183 default:
1184 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1185 return 0;
1186 }
1187 }
1188
1189 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1190 unsigned long *rflags)
1191 {
1192 switch (cr) {
1193 case 0:
1194 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1195 *rflags = kvm_arch_ops->get_rflags(vcpu);
1196 break;
1197 case 2:
1198 vcpu->cr2 = val;
1199 break;
1200 case 3:
1201 set_cr3(vcpu, val);
1202 break;
1203 case 4:
1204 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1205 break;
1206 default:
1207 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1208 }
1209 }
1210
1211 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1212 {
1213 u64 data;
1214
1215 switch (msr) {
1216 case 0xc0010010: /* SYSCFG */
1217 case 0xc0010015: /* HWCR */
1218 case MSR_IA32_PLATFORM_ID:
1219 case MSR_IA32_P5_MC_ADDR:
1220 case MSR_IA32_P5_MC_TYPE:
1221 case MSR_IA32_MC0_CTL:
1222 case MSR_IA32_MCG_STATUS:
1223 case MSR_IA32_MCG_CAP:
1224 case MSR_IA32_MC0_MISC:
1225 case MSR_IA32_MC0_MISC+4:
1226 case MSR_IA32_MC0_MISC+8:
1227 case MSR_IA32_MC0_MISC+12:
1228 case MSR_IA32_MC0_MISC+16:
1229 case MSR_IA32_UCODE_REV:
1230 case MSR_IA32_PERF_STATUS:
1231 /* MTRR registers */
1232 case 0xfe:
1233 case 0x200 ... 0x2ff:
1234 data = 0;
1235 break;
1236 case 0xcd: /* fsb frequency */
1237 data = 3;
1238 break;
1239 case MSR_IA32_APICBASE:
1240 data = vcpu->apic_base;
1241 break;
1242 case MSR_IA32_MISC_ENABLE:
1243 data = vcpu->ia32_misc_enable_msr;
1244 break;
1245 #ifdef CONFIG_X86_64
1246 case MSR_EFER:
1247 data = vcpu->shadow_efer;
1248 break;
1249 #endif
1250 default:
1251 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1252 return 1;
1253 }
1254 *pdata = data;
1255 return 0;
1256 }
1257 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1258
1259 /*
1260 * Reads an msr value (of 'msr_index') into 'pdata'.
1261 * Returns 0 on success, non-0 otherwise.
1262 * Assumes vcpu_load() was already called.
1263 */
1264 static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1265 {
1266 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1267 }
1268
1269 #ifdef CONFIG_X86_64
1270
1271 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1272 {
1273 if (efer & EFER_RESERVED_BITS) {
1274 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1275 efer);
1276 inject_gp(vcpu);
1277 return;
1278 }
1279
1280 if (is_paging(vcpu)
1281 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1282 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1283 inject_gp(vcpu);
1284 return;
1285 }
1286
1287 kvm_arch_ops->set_efer(vcpu, efer);
1288
1289 efer &= ~EFER_LMA;
1290 efer |= vcpu->shadow_efer & EFER_LMA;
1291
1292 vcpu->shadow_efer = efer;
1293 }
1294
1295 #endif
1296
1297 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1298 {
1299 switch (msr) {
1300 #ifdef CONFIG_X86_64
1301 case MSR_EFER:
1302 set_efer(vcpu, data);
1303 break;
1304 #endif
1305 case MSR_IA32_MC0_STATUS:
1306 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1307 __FUNCTION__, data);
1308 break;
1309 case MSR_IA32_UCODE_REV:
1310 case MSR_IA32_UCODE_WRITE:
1311 case 0x200 ... 0x2ff: /* MTRRs */
1312 break;
1313 case MSR_IA32_APICBASE:
1314 vcpu->apic_base = data;
1315 break;
1316 case MSR_IA32_MISC_ENABLE:
1317 vcpu->ia32_misc_enable_msr = data;
1318 break;
1319 default:
1320 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1321 return 1;
1322 }
1323 return 0;
1324 }
1325 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1326
1327 /*
1328 * Writes msr value into into the appropriate "register".
1329 * Returns 0 on success, non-0 otherwise.
1330 * Assumes vcpu_load() was already called.
1331 */
1332 static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1333 {
1334 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1335 }
1336
1337 void kvm_resched(struct kvm_vcpu *vcpu)
1338 {
1339 vcpu_put(vcpu);
1340 cond_resched();
1341 /* Cannot fail - no vcpu unplug yet. */
1342 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1343 }
1344 EXPORT_SYMBOL_GPL(kvm_resched);
1345
1346 void load_msrs(struct vmx_msr_entry *e, int n)
1347 {
1348 int i;
1349
1350 for (i = 0; i < n; ++i)
1351 wrmsrl(e[i].index, e[i].data);
1352 }
1353 EXPORT_SYMBOL_GPL(load_msrs);
1354
1355 void save_msrs(struct vmx_msr_entry *e, int n)
1356 {
1357 int i;
1358
1359 for (i = 0; i < n; ++i)
1360 rdmsrl(e[i].index, e[i].data);
1361 }
1362 EXPORT_SYMBOL_GPL(save_msrs);
1363
1364 static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1365 {
1366 struct kvm_vcpu *vcpu;
1367 int r;
1368
1369 if (!valid_vcpu(kvm_run->vcpu))
1370 return -EINVAL;
1371
1372 vcpu = vcpu_load(kvm, kvm_run->vcpu);
1373 if (!vcpu)
1374 return -ENOENT;
1375
1376 /* re-sync apic's tpr */
1377 vcpu->cr8 = kvm_run->cr8;
1378
1379 if (kvm_run->emulated) {
1380 kvm_arch_ops->skip_emulated_instruction(vcpu);
1381 kvm_run->emulated = 0;
1382 }
1383
1384 if (kvm_run->mmio_completed) {
1385 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1386 vcpu->mmio_read_completed = 1;
1387 }
1388
1389 vcpu->mmio_needed = 0;
1390
1391 r = kvm_arch_ops->run(vcpu, kvm_run);
1392
1393 vcpu_put(vcpu);
1394 return r;
1395 }
1396
1397 static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1398 {
1399 struct kvm_vcpu *vcpu;
1400
1401 if (!valid_vcpu(regs->vcpu))
1402 return -EINVAL;
1403
1404 vcpu = vcpu_load(kvm, regs->vcpu);
1405 if (!vcpu)
1406 return -ENOENT;
1407
1408 kvm_arch_ops->cache_regs(vcpu);
1409
1410 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1411 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1412 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1413 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1414 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1415 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1416 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1417 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
1418 #ifdef CONFIG_X86_64
1419 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1420 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1421 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1422 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1423 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1424 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1425 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1426 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1427 #endif
1428
1429 regs->rip = vcpu->rip;
1430 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1431
1432 /*
1433 * Don't leak debug flags in case they were set for guest debugging
1434 */
1435 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1436 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1437
1438 vcpu_put(vcpu);
1439
1440 return 0;
1441 }
1442
1443 static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1444 {
1445 struct kvm_vcpu *vcpu;
1446
1447 if (!valid_vcpu(regs->vcpu))
1448 return -EINVAL;
1449
1450 vcpu = vcpu_load(kvm, regs->vcpu);
1451 if (!vcpu)
1452 return -ENOENT;
1453
1454 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1455 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1456 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1457 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1458 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1459 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1460 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1461 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
1462 #ifdef CONFIG_X86_64
1463 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1464 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1465 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1466 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1467 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1468 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1469 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1470 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1471 #endif
1472
1473 vcpu->rip = regs->rip;
1474 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1475
1476 kvm_arch_ops->decache_regs(vcpu);
1477
1478 vcpu_put(vcpu);
1479
1480 return 0;
1481 }
1482
1483 static void get_segment(struct kvm_vcpu *vcpu,
1484 struct kvm_segment *var, int seg)
1485 {
1486 return kvm_arch_ops->get_segment(vcpu, var, seg);
1487 }
1488
1489 static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1490 {
1491 struct kvm_vcpu *vcpu;
1492 struct descriptor_table dt;
1493
1494 if (!valid_vcpu(sregs->vcpu))
1495 return -EINVAL;
1496 vcpu = vcpu_load(kvm, sregs->vcpu);
1497 if (!vcpu)
1498 return -ENOENT;
1499
1500 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1501 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1502 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1503 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1504 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1505 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1506
1507 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1508 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1509
1510 kvm_arch_ops->get_idt(vcpu, &dt);
1511 sregs->idt.limit = dt.limit;
1512 sregs->idt.base = dt.base;
1513 kvm_arch_ops->get_gdt(vcpu, &dt);
1514 sregs->gdt.limit = dt.limit;
1515 sregs->gdt.base = dt.base;
1516
1517 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1518 sregs->cr0 = vcpu->cr0;
1519 sregs->cr2 = vcpu->cr2;
1520 sregs->cr3 = vcpu->cr3;
1521 sregs->cr4 = vcpu->cr4;
1522 sregs->cr8 = vcpu->cr8;
1523 sregs->efer = vcpu->shadow_efer;
1524 sregs->apic_base = vcpu->apic_base;
1525
1526 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1527 sizeof sregs->interrupt_bitmap);
1528
1529 vcpu_put(vcpu);
1530
1531 return 0;
1532 }
1533
1534 static void set_segment(struct kvm_vcpu *vcpu,
1535 struct kvm_segment *var, int seg)
1536 {
1537 return kvm_arch_ops->set_segment(vcpu, var, seg);
1538 }
1539
1540 static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1541 {
1542 struct kvm_vcpu *vcpu;
1543 int mmu_reset_needed = 0;
1544 int i;
1545 struct descriptor_table dt;
1546
1547 if (!valid_vcpu(sregs->vcpu))
1548 return -EINVAL;
1549 vcpu = vcpu_load(kvm, sregs->vcpu);
1550 if (!vcpu)
1551 return -ENOENT;
1552
1553 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1554 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1555 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1556 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1557 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1558 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1559
1560 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1561 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1562
1563 dt.limit = sregs->idt.limit;
1564 dt.base = sregs->idt.base;
1565 kvm_arch_ops->set_idt(vcpu, &dt);
1566 dt.limit = sregs->gdt.limit;
1567 dt.base = sregs->gdt.base;
1568 kvm_arch_ops->set_gdt(vcpu, &dt);
1569
1570 vcpu->cr2 = sregs->cr2;
1571 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1572 vcpu->cr3 = sregs->cr3;
1573
1574 vcpu->cr8 = sregs->cr8;
1575
1576 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
1577 #ifdef CONFIG_X86_64
1578 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1579 #endif
1580 vcpu->apic_base = sregs->apic_base;
1581
1582 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1583
1584 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1585 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1586
1587 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1588 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1589 if (!is_long_mode(vcpu) && is_pae(vcpu))
1590 load_pdptrs(vcpu, vcpu->cr3);
1591
1592 if (mmu_reset_needed)
1593 kvm_mmu_reset_context(vcpu);
1594
1595 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1596 sizeof vcpu->irq_pending);
1597 vcpu->irq_summary = 0;
1598 for (i = 0; i < NR_IRQ_WORDS; ++i)
1599 if (vcpu->irq_pending[i])
1600 __set_bit(i, &vcpu->irq_summary);
1601
1602 vcpu_put(vcpu);
1603
1604 return 0;
1605 }
1606
1607 /*
1608 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1609 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
1610 *
1611 * This list is modified at module load time to reflect the
1612 * capabilities of the host cpu.
1613 */
1614 static u32 msrs_to_save[] = {
1615 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1616 MSR_K6_STAR,
1617 #ifdef CONFIG_X86_64
1618 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1619 #endif
1620 MSR_IA32_TIME_STAMP_COUNTER,
1621 };
1622
1623 static unsigned num_msrs_to_save;
1624
1625 static u32 emulated_msrs[] = {
1626 MSR_IA32_MISC_ENABLE,
1627 };
1628
1629 static __init void kvm_init_msr_list(void)
1630 {
1631 u32 dummy[2];
1632 unsigned i, j;
1633
1634 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1635 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1636 continue;
1637 if (j < i)
1638 msrs_to_save[j] = msrs_to_save[i];
1639 j++;
1640 }
1641 num_msrs_to_save = j;
1642 }
1643
1644 /*
1645 * Adapt set_msr() to msr_io()'s calling convention
1646 */
1647 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1648 {
1649 return set_msr(vcpu, index, *data);
1650 }
1651
1652 /*
1653 * Read or write a bunch of msrs. All parameters are kernel addresses.
1654 *
1655 * @return number of msrs set successfully.
1656 */
1657 static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1658 struct kvm_msr_entry *entries,
1659 int (*do_msr)(struct kvm_vcpu *vcpu,
1660 unsigned index, u64 *data))
1661 {
1662 struct kvm_vcpu *vcpu;
1663 int i;
1664
1665 if (!valid_vcpu(msrs->vcpu))
1666 return -EINVAL;
1667
1668 vcpu = vcpu_load(kvm, msrs->vcpu);
1669 if (!vcpu)
1670 return -ENOENT;
1671
1672 for (i = 0; i < msrs->nmsrs; ++i)
1673 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1674 break;
1675
1676 vcpu_put(vcpu);
1677
1678 return i;
1679 }
1680
1681 /*
1682 * Read or write a bunch of msrs. Parameters are user addresses.
1683 *
1684 * @return number of msrs set successfully.
1685 */
1686 static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1687 int (*do_msr)(struct kvm_vcpu *vcpu,
1688 unsigned index, u64 *data),
1689 int writeback)
1690 {
1691 struct kvm_msrs msrs;
1692 struct kvm_msr_entry *entries;
1693 int r, n;
1694 unsigned size;
1695
1696 r = -EFAULT;
1697 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1698 goto out;
1699
1700 r = -E2BIG;
1701 if (msrs.nmsrs >= MAX_IO_MSRS)
1702 goto out;
1703
1704 r = -ENOMEM;
1705 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1706 entries = vmalloc(size);
1707 if (!entries)
1708 goto out;
1709
1710 r = -EFAULT;
1711 if (copy_from_user(entries, user_msrs->entries, size))
1712 goto out_free;
1713
1714 r = n = __msr_io(kvm, &msrs, entries, do_msr);
1715 if (r < 0)
1716 goto out_free;
1717
1718 r = -EFAULT;
1719 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1720 goto out_free;
1721
1722 r = n;
1723
1724 out_free:
1725 vfree(entries);
1726 out:
1727 return r;
1728 }
1729
1730 /*
1731 * Translate a guest virtual address to a guest physical address.
1732 */
1733 static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1734 {
1735 unsigned long vaddr = tr->linear_address;
1736 struct kvm_vcpu *vcpu;
1737 gpa_t gpa;
1738
1739 vcpu = vcpu_load(kvm, tr->vcpu);
1740 if (!vcpu)
1741 return -ENOENT;
1742 spin_lock(&kvm->lock);
1743 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1744 tr->physical_address = gpa;
1745 tr->valid = gpa != UNMAPPED_GVA;
1746 tr->writeable = 1;
1747 tr->usermode = 0;
1748 spin_unlock(&kvm->lock);
1749 vcpu_put(vcpu);
1750
1751 return 0;
1752 }
1753
1754 static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1755 {
1756 struct kvm_vcpu *vcpu;
1757
1758 if (!valid_vcpu(irq->vcpu))
1759 return -EINVAL;
1760 if (irq->irq < 0 || irq->irq >= 256)
1761 return -EINVAL;
1762 vcpu = vcpu_load(kvm, irq->vcpu);
1763 if (!vcpu)
1764 return -ENOENT;
1765
1766 set_bit(irq->irq, vcpu->irq_pending);
1767 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1768
1769 vcpu_put(vcpu);
1770
1771 return 0;
1772 }
1773
1774 static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1775 struct kvm_debug_guest *dbg)
1776 {
1777 struct kvm_vcpu *vcpu;
1778 int r;
1779
1780 if (!valid_vcpu(dbg->vcpu))
1781 return -EINVAL;
1782 vcpu = vcpu_load(kvm, dbg->vcpu);
1783 if (!vcpu)
1784 return -ENOENT;
1785
1786 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1787
1788 vcpu_put(vcpu);
1789
1790 return r;
1791 }
1792
1793 static long kvm_dev_ioctl(struct file *filp,
1794 unsigned int ioctl, unsigned long arg)
1795 {
1796 struct kvm *kvm = filp->private_data;
1797 void __user *argp = (void __user *)arg;
1798 int r = -EINVAL;
1799
1800 switch (ioctl) {
1801 case KVM_GET_API_VERSION:
1802 r = KVM_API_VERSION;
1803 break;
1804 case KVM_CREATE_VCPU: {
1805 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1806 if (r)
1807 goto out;
1808 break;
1809 }
1810 case KVM_RUN: {
1811 struct kvm_run kvm_run;
1812
1813 r = -EFAULT;
1814 if (copy_from_user(&kvm_run, argp, sizeof kvm_run))
1815 goto out;
1816 r = kvm_dev_ioctl_run(kvm, &kvm_run);
1817 if (r < 0 && r != -EINTR)
1818 goto out;
1819 if (copy_to_user(argp, &kvm_run, sizeof kvm_run)) {
1820 r = -EFAULT;
1821 goto out;
1822 }
1823 break;
1824 }
1825 case KVM_GET_REGS: {
1826 struct kvm_regs kvm_regs;
1827
1828 r = -EFAULT;
1829 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
1830 goto out;
1831 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
1832 if (r)
1833 goto out;
1834 r = -EFAULT;
1835 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
1836 goto out;
1837 r = 0;
1838 break;
1839 }
1840 case KVM_SET_REGS: {
1841 struct kvm_regs kvm_regs;
1842
1843 r = -EFAULT;
1844 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
1845 goto out;
1846 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
1847 if (r)
1848 goto out;
1849 r = 0;
1850 break;
1851 }
1852 case KVM_GET_SREGS: {
1853 struct kvm_sregs kvm_sregs;
1854
1855 r = -EFAULT;
1856 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
1857 goto out;
1858 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
1859 if (r)
1860 goto out;
1861 r = -EFAULT;
1862 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
1863 goto out;
1864 r = 0;
1865 break;
1866 }
1867 case KVM_SET_SREGS: {
1868 struct kvm_sregs kvm_sregs;
1869
1870 r = -EFAULT;
1871 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
1872 goto out;
1873 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
1874 if (r)
1875 goto out;
1876 r = 0;
1877 break;
1878 }
1879 case KVM_TRANSLATE: {
1880 struct kvm_translation tr;
1881
1882 r = -EFAULT;
1883 if (copy_from_user(&tr, argp, sizeof tr))
1884 goto out;
1885 r = kvm_dev_ioctl_translate(kvm, &tr);
1886 if (r)
1887 goto out;
1888 r = -EFAULT;
1889 if (copy_to_user(argp, &tr, sizeof tr))
1890 goto out;
1891 r = 0;
1892 break;
1893 }
1894 case KVM_INTERRUPT: {
1895 struct kvm_interrupt irq;
1896
1897 r = -EFAULT;
1898 if (copy_from_user(&irq, argp, sizeof irq))
1899 goto out;
1900 r = kvm_dev_ioctl_interrupt(kvm, &irq);
1901 if (r)
1902 goto out;
1903 r = 0;
1904 break;
1905 }
1906 case KVM_DEBUG_GUEST: {
1907 struct kvm_debug_guest dbg;
1908
1909 r = -EFAULT;
1910 if (copy_from_user(&dbg, argp, sizeof dbg))
1911 goto out;
1912 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
1913 if (r)
1914 goto out;
1915 r = 0;
1916 break;
1917 }
1918 case KVM_SET_MEMORY_REGION: {
1919 struct kvm_memory_region kvm_mem;
1920
1921 r = -EFAULT;
1922 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
1923 goto out;
1924 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
1925 if (r)
1926 goto out;
1927 break;
1928 }
1929 case KVM_GET_DIRTY_LOG: {
1930 struct kvm_dirty_log log;
1931
1932 r = -EFAULT;
1933 if (copy_from_user(&log, argp, sizeof log))
1934 goto out;
1935 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
1936 if (r)
1937 goto out;
1938 break;
1939 }
1940 case KVM_GET_MSRS:
1941 r = msr_io(kvm, argp, get_msr, 1);
1942 break;
1943 case KVM_SET_MSRS:
1944 r = msr_io(kvm, argp, do_set_msr, 0);
1945 break;
1946 case KVM_GET_MSR_INDEX_LIST: {
1947 struct kvm_msr_list __user *user_msr_list = argp;
1948 struct kvm_msr_list msr_list;
1949 unsigned n;
1950
1951 r = -EFAULT;
1952 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1953 goto out;
1954 n = msr_list.nmsrs;
1955 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
1956 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1957 goto out;
1958 r = -E2BIG;
1959 if (n < num_msrs_to_save)
1960 goto out;
1961 r = -EFAULT;
1962 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
1963 num_msrs_to_save * sizeof(u32)))
1964 goto out;
1965 if (copy_to_user(user_msr_list->indices
1966 + num_msrs_to_save * sizeof(u32),
1967 &emulated_msrs,
1968 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
1969 goto out;
1970 r = 0;
1971 break;
1972 }
1973 default:
1974 ;
1975 }
1976 out:
1977 return r;
1978 }
1979
1980 static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
1981 unsigned long address,
1982 int *type)
1983 {
1984 struct kvm *kvm = vma->vm_file->private_data;
1985 unsigned long pgoff;
1986 struct kvm_memory_slot *slot;
1987 struct page *page;
1988
1989 *type = VM_FAULT_MINOR;
1990 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1991 slot = gfn_to_memslot(kvm, pgoff);
1992 if (!slot)
1993 return NOPAGE_SIGBUS;
1994 page = gfn_to_page(slot, pgoff);
1995 if (!page)
1996 return NOPAGE_SIGBUS;
1997 get_page(page);
1998 return page;
1999 }
2000
2001 static struct vm_operations_struct kvm_dev_vm_ops = {
2002 .nopage = kvm_dev_nopage,
2003 };
2004
2005 static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
2006 {
2007 vma->vm_ops = &kvm_dev_vm_ops;
2008 return 0;
2009 }
2010
2011 static struct file_operations kvm_chardev_ops = {
2012 .open = kvm_dev_open,
2013 .release = kvm_dev_release,
2014 .unlocked_ioctl = kvm_dev_ioctl,
2015 .compat_ioctl = kvm_dev_ioctl,
2016 .mmap = kvm_dev_mmap,
2017 };
2018
2019 static struct miscdevice kvm_dev = {
2020 MISC_DYNAMIC_MINOR,
2021 "kvm",
2022 &kvm_chardev_ops,
2023 };
2024
2025 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2026 void *v)
2027 {
2028 if (val == SYS_RESTART) {
2029 /*
2030 * Some (well, at least mine) BIOSes hang on reboot if
2031 * in vmx root mode.
2032 */
2033 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2034 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2035 }
2036 return NOTIFY_OK;
2037 }
2038
2039 static struct notifier_block kvm_reboot_notifier = {
2040 .notifier_call = kvm_reboot,
2041 .priority = 0,
2042 };
2043
2044 /*
2045 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2046 * cached on it.
2047 */
2048 static void decache_vcpus_on_cpu(int cpu)
2049 {
2050 struct kvm *vm;
2051 struct kvm_vcpu *vcpu;
2052 int i;
2053
2054 spin_lock(&kvm_lock);
2055 list_for_each_entry(vm, &vm_list, vm_list)
2056 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2057 vcpu = &vm->vcpus[i];
2058 /*
2059 * If the vcpu is locked, then it is running on some
2060 * other cpu and therefore it is not cached on the
2061 * cpu in question.
2062 *
2063 * If it's not locked, check the last cpu it executed
2064 * on.
2065 */
2066 if (mutex_trylock(&vcpu->mutex)) {
2067 if (vcpu->cpu == cpu) {
2068 kvm_arch_ops->vcpu_decache(vcpu);
2069 vcpu->cpu = -1;
2070 }
2071 mutex_unlock(&vcpu->mutex);
2072 }
2073 }
2074 spin_unlock(&kvm_lock);
2075 }
2076
2077 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2078 void *v)
2079 {
2080 int cpu = (long)v;
2081
2082 switch (val) {
2083 case CPU_DEAD:
2084 case CPU_UP_CANCELED:
2085 decache_vcpus_on_cpu(cpu);
2086 smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
2087 NULL, 0, 1);
2088 break;
2089 case CPU_UP_PREPARE:
2090 smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
2091 NULL, 0, 1);
2092 break;
2093 }
2094 return NOTIFY_OK;
2095 }
2096
2097 static struct notifier_block kvm_cpu_notifier = {
2098 .notifier_call = kvm_cpu_hotplug,
2099 .priority = 20, /* must be > scheduler priority */
2100 };
2101
2102 static __init void kvm_init_debug(void)
2103 {
2104 struct kvm_stats_debugfs_item *p;
2105
2106 debugfs_dir = debugfs_create_dir("kvm", NULL);
2107 for (p = debugfs_entries; p->name; ++p)
2108 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
2109 p->data);
2110 }
2111
2112 static void kvm_exit_debug(void)
2113 {
2114 struct kvm_stats_debugfs_item *p;
2115
2116 for (p = debugfs_entries; p->name; ++p)
2117 debugfs_remove(p->dentry);
2118 debugfs_remove(debugfs_dir);
2119 }
2120
2121 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2122 {
2123 decache_vcpus_on_cpu(raw_smp_processor_id());
2124 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
2125 return 0;
2126 }
2127
2128 static int kvm_resume(struct sys_device *dev)
2129 {
2130 on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1);
2131 return 0;
2132 }
2133
2134 static struct sysdev_class kvm_sysdev_class = {
2135 set_kset_name("kvm"),
2136 .suspend = kvm_suspend,
2137 .resume = kvm_resume,
2138 };
2139
2140 static struct sys_device kvm_sysdev = {
2141 .id = 0,
2142 .cls = &kvm_sysdev_class,
2143 };
2144
2145 hpa_t bad_page_address;
2146
2147 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
2148 {
2149 int r;
2150
2151 if (kvm_arch_ops) {
2152 printk(KERN_ERR "kvm: already loaded the other module\n");
2153 return -EEXIST;
2154 }
2155
2156 if (!ops->cpu_has_kvm_support()) {
2157 printk(KERN_ERR "kvm: no hardware support\n");
2158 return -EOPNOTSUPP;
2159 }
2160 if (ops->disabled_by_bios()) {
2161 printk(KERN_ERR "kvm: disabled by bios\n");
2162 return -EOPNOTSUPP;
2163 }
2164
2165 kvm_arch_ops = ops;
2166
2167 r = kvm_arch_ops->hardware_setup();
2168 if (r < 0)
2169 return r;
2170
2171 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
2172 r = register_cpu_notifier(&kvm_cpu_notifier);
2173 if (r)
2174 goto out_free_1;
2175 register_reboot_notifier(&kvm_reboot_notifier);
2176
2177 r = sysdev_class_register(&kvm_sysdev_class);
2178 if (r)
2179 goto out_free_2;
2180
2181 r = sysdev_register(&kvm_sysdev);
2182 if (r)
2183 goto out_free_3;
2184
2185 kvm_chardev_ops.owner = module;
2186
2187 r = misc_register(&kvm_dev);
2188 if (r) {
2189 printk (KERN_ERR "kvm: misc device register failed\n");
2190 goto out_free;
2191 }
2192
2193 return r;
2194
2195 out_free:
2196 sysdev_unregister(&kvm_sysdev);
2197 out_free_3:
2198 sysdev_class_unregister(&kvm_sysdev_class);
2199 out_free_2:
2200 unregister_reboot_notifier(&kvm_reboot_notifier);
2201 unregister_cpu_notifier(&kvm_cpu_notifier);
2202 out_free_1:
2203 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2204 kvm_arch_ops->hardware_unsetup();
2205 return r;
2206 }
2207
2208 void kvm_exit_arch(void)
2209 {
2210 misc_deregister(&kvm_dev);
2211 sysdev_unregister(&kvm_sysdev);
2212 sysdev_class_unregister(&kvm_sysdev_class);
2213 unregister_reboot_notifier(&kvm_reboot_notifier);
2214 unregister_cpu_notifier(&kvm_cpu_notifier);
2215 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2216 kvm_arch_ops->hardware_unsetup();
2217 kvm_arch_ops = NULL;
2218 }
2219
2220 static __init int kvm_init(void)
2221 {
2222 static struct page *bad_page;
2223 int r = 0;
2224
2225 kvm_init_debug();
2226
2227 kvm_init_msr_list();
2228
2229 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2230 r = -ENOMEM;
2231 goto out;
2232 }
2233
2234 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2235 memset(__va(bad_page_address), 0, PAGE_SIZE);
2236
2237 return r;
2238
2239 out:
2240 kvm_exit_debug();
2241 return r;
2242 }
2243
2244 static __exit void kvm_exit(void)
2245 {
2246 kvm_exit_debug();
2247 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
2248 }
2249
2250 module_init(kvm_init)
2251 module_exit(kvm_exit)
2252
2253 EXPORT_SYMBOL_GPL(kvm_init_arch);
2254 EXPORT_SYMBOL_GPL(kvm_exit_arch);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree