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[PATCH] KVM: cpu hotplug support
[linux-block.git] / drivers / kvm / kvm_main.c
CommitLineData
6aa8b732
AK		 1/*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
8 *
9 * Authors:
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
12 *
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
15 *
16 */
17
18#include "kvm.h"
19
20#include <linux/kvm.h>
21#include <linux/module.h>
22#include <linux/errno.h>
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>
774c47f1 37#include <linux/cpu.h>
6aa8b732
AK		 38
39#include "x86_emulate.h"
40#include "segment_descriptor.h"
41
42MODULE_AUTHOR("Qumranet");
43MODULE_LICENSE("GPL");
44
133de902
AK		 45static DEFINE_SPINLOCK(kvm_lock);
46static LIST_HEAD(vm_list);
47
6aa8b732
AK		 48struct kvm_arch_ops *kvm_arch_ops;
49struct kvm_stat kvm_stat;
50EXPORT_SYMBOL_GPL(kvm_stat);
51
52static struct kvm_stats_debugfs_item {
53 const char *name;
54 u32 *data;
55 struct dentry *dentry;
56} debugfs_entries[] = {
57 { "pf_fixed", &kvm_stat.pf_fixed },
58 { "pf_guest", &kvm_stat.pf_guest },
59 { "tlb_flush", &kvm_stat.tlb_flush },
60 { "invlpg", &kvm_stat.invlpg },
61 { "exits", &kvm_stat.exits },
62 { "io_exits", &kvm_stat.io_exits },
63 { "mmio_exits", &kvm_stat.mmio_exits },
64 { "signal_exits", &kvm_stat.signal_exits },
c1150d8c
DL		 65 { "irq_window", &kvm_stat.irq_window_exits },
66 { "halt_exits", &kvm_stat.halt_exits },
67 { "request_irq", &kvm_stat.request_irq_exits },
6aa8b732 68 { "irq_exits", &kvm_stat.irq_exits },
8b6d44c7 69 { NULL, NULL }
6aa8b732
AK		 70};
71
72static struct dentry *debugfs_dir;
73
74#define MAX_IO_MSRS 256
75
76#define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
77#define LMSW_GUEST_MASK 0x0eULL
78#define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
79#define CR8_RESEVED_BITS (~0x0fULL)
80#define EFER_RESERVED_BITS 0xfffffffffffff2fe
81
05b3e0c2 82#ifdef CONFIG_X86_64
6aa8b732
AK		 83// LDT or TSS descriptor in the GDT. 16 bytes.
84struct segment_descriptor_64 {
85 struct segment_descriptor s;
86 u32 base_higher;
87 u32 pad_zero;
88};
89
90#endif
91
92unsigned long segment_base(u16 selector)
93{
94 struct descriptor_table gdt;
95 struct segment_descriptor *d;
96 unsigned long table_base;
97 typedef unsigned long ul;
98 unsigned long v;
99
100 if (selector == 0)
101 return 0;
102
103 asm ("sgdt %0" : "=m"(gdt));
104 table_base = gdt.base;
105
106 if (selector & 4) { /* from ldt */
107 u16 ldt_selector;
108
109 asm ("sldt %0" : "=g"(ldt_selector));
110 table_base = segment_base(ldt_selector);
111 }
112 d = (struct segment_descriptor *)(table_base + (selector & ~7));
113 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
05b3e0c2 114#ifdef CONFIG_X86_64
6aa8b732
AK		 115 if (d->system == 0
116 && (d->type == 2 || d->type == 9 || d->type == 11))
117 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
118#endif
119 return v;
120}
121EXPORT_SYMBOL_GPL(segment_base);
122
5aacf0ca
JM		 123static inline int valid_vcpu(int n)
124{
125 return likely(n >= 0 && n < KVM_MAX_VCPUS);
126}
127
6aa8b732
AK		 128int kvm_read_guest(struct kvm_vcpu *vcpu,
129 gva_t addr,
130 unsigned long size,
131 void *dest)
132{
133 unsigned char *host_buf = dest;
134 unsigned long req_size = size;
135
136 while (size) {
137 hpa_t paddr;
138 unsigned now;
139 unsigned offset;
140 hva_t guest_buf;
141
142 paddr = gva_to_hpa(vcpu, addr);
143
144 if (is_error_hpa(paddr))
145 break;
146
147 guest_buf = (hva_t)kmap_atomic(
148 pfn_to_page(paddr >> PAGE_SHIFT),
149 KM_USER0);
150 offset = addr & ~PAGE_MASK;
151 guest_buf |= offset;
152 now = min(size, PAGE_SIZE - offset);
153 memcpy(host_buf, (void*)guest_buf, now);
154 host_buf += now;
155 addr += now;
156 size -= now;
157 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
158 }
159 return req_size - size;
160}
161EXPORT_SYMBOL_GPL(kvm_read_guest);
162
163int kvm_write_guest(struct kvm_vcpu *vcpu,
164 gva_t addr,
165 unsigned long size,
166 void *data)
167{
168 unsigned char *host_buf = data;
169 unsigned long req_size = size;
170
171 while (size) {
172 hpa_t paddr;
173 unsigned now;
174 unsigned offset;
175 hva_t guest_buf;
176
177 paddr = gva_to_hpa(vcpu, addr);
178
179 if (is_error_hpa(paddr))
180 break;
181
182 guest_buf = (hva_t)kmap_atomic(
183 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
184 offset = addr & ~PAGE_MASK;
185 guest_buf |= offset;
186 now = min(size, PAGE_SIZE - offset);
187 memcpy((void*)guest_buf, host_buf, now);
188 host_buf += now;
189 addr += now;
190 size -= now;
191 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
192 }
193 return req_size - size;
194}
195EXPORT_SYMBOL_GPL(kvm_write_guest);
196
197static int vcpu_slot(struct kvm_vcpu *vcpu)
198{
199 return vcpu - vcpu->kvm->vcpus;
200}
201
202/*
203 * Switches to specified vcpu, until a matching vcpu_put()
204 */
205static struct kvm_vcpu *vcpu_load(struct kvm *kvm, int vcpu_slot)
206{
207 struct kvm_vcpu *vcpu = &kvm->vcpus[vcpu_slot];
208
209 mutex_lock(&vcpu->mutex);
210 if (unlikely(!vcpu->vmcs)) {
211 mutex_unlock(&vcpu->mutex);
8b6d44c7 212 return NULL;
6aa8b732
AK		 213 }
214 return kvm_arch_ops->vcpu_load(vcpu);
215}
216
217static void vcpu_put(struct kvm_vcpu *vcpu)
218{
219 kvm_arch_ops->vcpu_put(vcpu);
6aa8b732
AK		 220 mutex_unlock(&vcpu->mutex);
221}
222
223static int kvm_dev_open(struct inode *inode, struct file *filp)
224{
225 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
226 int i;
227
228 if (!kvm)
229 return -ENOMEM;
230
231 spin_lock_init(&kvm->lock);
232 INIT_LIST_HEAD(&kvm->active_mmu_pages);
233 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
234 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
235
236 mutex_init(&vcpu->mutex);
133de902 237 vcpu->cpu = -1;
86a2b42e 238 vcpu->kvm = kvm;
6aa8b732
AK		 239 vcpu->mmu.root_hpa = INVALID_PAGE;
240 INIT_LIST_HEAD(&vcpu->free_pages);
133de902
AK		 241 spin_lock(&kvm_lock);
242 list_add(&kvm->vm_list, &vm_list);
243 spin_unlock(&kvm_lock);
6aa8b732
AK		 244 }
245 filp->private_data = kvm;
246 return 0;
247}
248
249/*
250 * Free any memory in @free but not in @dont.
251 */
252static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
253 struct kvm_memory_slot *dont)
254{
255 int i;
256
257 if (!dont || free->phys_mem != dont->phys_mem)
258 if (free->phys_mem) {
259 for (i = 0; i < free->npages; ++i)
55a54f79
AK		 260 if (free->phys_mem[i])
261 __free_page(free->phys_mem[i]);
6aa8b732
AK		 262 vfree(free->phys_mem);
263 }
264
265 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
266 vfree(free->dirty_bitmap);
267
8b6d44c7 268 free->phys_mem = NULL;
6aa8b732 269 free->npages = 0;
8b6d44c7 270 free->dirty_bitmap = NULL;
6aa8b732
AK		 271}
272
273static void kvm_free_physmem(struct kvm *kvm)
274{
275 int i;
276
277 for (i = 0; i < kvm->nmemslots; ++i)
8b6d44c7 278 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
6aa8b732
AK		 279}
280
281static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
282{
1e8ba6fb
IM		 283 if (!vcpu_load(vcpu->kvm, vcpu_slot(vcpu)))
284 return;
285
6aa8b732 286 kvm_mmu_destroy(vcpu);
08438475 287 vcpu_put(vcpu);
9ede74e0 288 kvm_arch_ops->vcpu_free(vcpu);
6aa8b732
AK		 289}
290
291static void kvm_free_vcpus(struct kvm *kvm)
292{
293 unsigned int i;
294
295 for (i = 0; i < KVM_MAX_VCPUS; ++i)
296 kvm_free_vcpu(&kvm->vcpus[i]);
297}
298
299static int kvm_dev_release(struct inode *inode, struct file *filp)
300{
301 struct kvm *kvm = filp->private_data;
302
133de902
AK		 303 spin_lock(&kvm_lock);
304 list_del(&kvm->vm_list);
305 spin_unlock(&kvm_lock);
6aa8b732
AK		 306 kvm_free_vcpus(kvm);
307 kvm_free_physmem(kvm);
308 kfree(kvm);
309 return 0;
310}
311
312static void inject_gp(struct kvm_vcpu *vcpu)
313{
314 kvm_arch_ops->inject_gp(vcpu, 0);
315}
316
1342d353
AK		 317/*
318 * Load the pae pdptrs. Return true is they are all valid.
319 */
320static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
6aa8b732
AK		 321{
322 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
1342d353 323 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
6aa8b732
AK		 324 int i;
325 u64 pdpte;
326 u64 *pdpt;
1342d353 327 int ret;
6aa8b732
AK		 328 struct kvm_memory_slot *memslot;
329
330 spin_lock(&vcpu->kvm->lock);
331 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
332 /* FIXME: !memslot - emulate? 0xff? */
333 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
334
1342d353 335 ret = 1;
6aa8b732
AK		 336 for (i = 0; i < 4; ++i) {
337 pdpte = pdpt[offset + i];
1342d353
AK		 338 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
339 ret = 0;
340 goto out;
341 }
6aa8b732
AK		 342 }
343
1342d353
AK		 344 for (i = 0; i < 4; ++i)
345 vcpu->pdptrs[i] = pdpt[offset + i];
346
347out:
6aa8b732
AK		 348 kunmap_atomic(pdpt, KM_USER0);
349 spin_unlock(&vcpu->kvm->lock);
350
1342d353 351 return ret;
6aa8b732
AK		 352}
353
354void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
355{
356 if (cr0 & CR0_RESEVED_BITS) {
357 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
358 cr0, vcpu->cr0);
359 inject_gp(vcpu);
360 return;
361 }
362
363 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
364 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
365 inject_gp(vcpu);
366 return;
367 }
368
369 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
370 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
371 "and a clear PE flag\n");
372 inject_gp(vcpu);
373 return;
374 }
375
376 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
05b3e0c2 377#ifdef CONFIG_X86_64
6aa8b732
AK		 378 if ((vcpu->shadow_efer & EFER_LME)) {
379 int cs_db, cs_l;
380
381 if (!is_pae(vcpu)) {
382 printk(KERN_DEBUG "set_cr0: #GP, start paging "
383 "in long mode while PAE is disabled\n");
384 inject_gp(vcpu);
385 return;
386 }
387 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
388 if (cs_l) {
389 printk(KERN_DEBUG "set_cr0: #GP, start paging "
390 "in long mode while CS.L == 1\n");
391 inject_gp(vcpu);
392 return;
393
394 }
395 } else
396#endif
1342d353 397 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 398 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
399 "reserved bits\n");
400 inject_gp(vcpu);
401 return;
402 }
403
404 }
405
406 kvm_arch_ops->set_cr0(vcpu, cr0);
407 vcpu->cr0 = cr0;
408
409 spin_lock(&vcpu->kvm->lock);
410 kvm_mmu_reset_context(vcpu);
411 spin_unlock(&vcpu->kvm->lock);
412 return;
413}
414EXPORT_SYMBOL_GPL(set_cr0);
415
416void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
417{
399badf3 418 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 419 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
420}
421EXPORT_SYMBOL_GPL(lmsw);
422
423void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
424{
425 if (cr4 & CR4_RESEVED_BITS) {
426 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
427 inject_gp(vcpu);
428 return;
429 }
430
a9058ecd 431 if (is_long_mode(vcpu)) {
6aa8b732
AK		 432 if (!(cr4 & CR4_PAE_MASK)) {
433 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
434 "in long mode\n");
435 inject_gp(vcpu);
436 return;
437 }
438 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
1342d353 439 && !load_pdptrs(vcpu, vcpu->cr3)) {
6aa8b732
AK		 440 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
441 inject_gp(vcpu);
442 }
443
444 if (cr4 & CR4_VMXE_MASK) {
445 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
446 inject_gp(vcpu);
447 return;
448 }
449 kvm_arch_ops->set_cr4(vcpu, cr4);
450 spin_lock(&vcpu->kvm->lock);
451 kvm_mmu_reset_context(vcpu);
452 spin_unlock(&vcpu->kvm->lock);
453}
454EXPORT_SYMBOL_GPL(set_cr4);
455
456void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
457{
a9058ecd 458 if (is_long_mode(vcpu)) {
6aa8b732
AK		 459 if ( cr3 & CR3_L_MODE_RESEVED_BITS) {
460 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
461 inject_gp(vcpu);
462 return;
463 }
464 } else {
465 if (cr3 & CR3_RESEVED_BITS) {
466 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
467 inject_gp(vcpu);
468 return;
469 }
470 if (is_paging(vcpu) && is_pae(vcpu) &&
1342d353 471 !load_pdptrs(vcpu, cr3)) {
6aa8b732
AK		 472 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
473 "reserved bits\n");
474 inject_gp(vcpu);
475 return;
476 }
477 }
478
479 vcpu->cr3 = cr3;
480 spin_lock(&vcpu->kvm->lock);
d21225ee
IM		 481 /*
482 * Does the new cr3 value map to physical memory? (Note, we
483 * catch an invalid cr3 even in real-mode, because it would
484 * cause trouble later on when we turn on paging anyway.)
485 *
486 * A real CPU would silently accept an invalid cr3 and would
487 * attempt to use it - with largely undefined (and often hard
488 * to debug) behavior on the guest side.
489 */
490 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
491 inject_gp(vcpu);
492 else
493 vcpu->mmu.new_cr3(vcpu);
6aa8b732
AK		 494 spin_unlock(&vcpu->kvm->lock);
495}
496EXPORT_SYMBOL_GPL(set_cr3);
497
498void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
499{
500 if ( cr8 & CR8_RESEVED_BITS) {
501 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
502 inject_gp(vcpu);
503 return;
504 }
505 vcpu->cr8 = cr8;
506}
507EXPORT_SYMBOL_GPL(set_cr8);
508
509void fx_init(struct kvm_vcpu *vcpu)
510{
511 struct __attribute__ ((__packed__)) fx_image_s {
512 u16 control; //fcw
513 u16 status; //fsw
514 u16 tag; // ftw
515 u16 opcode; //fop
516 u64 ip; // fpu ip
517 u64 operand;// fpu dp
518 u32 mxcsr;
519 u32 mxcsr_mask;
520
521 } *fx_image;
522
523 fx_save(vcpu->host_fx_image);
524 fpu_init();
525 fx_save(vcpu->guest_fx_image);
526 fx_restore(vcpu->host_fx_image);
527
528 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
529 fx_image->mxcsr = 0x1f80;
530 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
531 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
532}
533EXPORT_SYMBOL_GPL(fx_init);
534
535/*
536 * Creates some virtual cpus. Good luck creating more than one.
537 */
538static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
539{
540 int r;
541 struct kvm_vcpu *vcpu;
542
543 r = -EINVAL;
5aacf0ca 544 if (!valid_vcpu(n))
6aa8b732
AK		 545 goto out;
546
547 vcpu = &kvm->vcpus[n];
548
549 mutex_lock(&vcpu->mutex);
550
551 if (vcpu->vmcs) {
552 mutex_unlock(&vcpu->mutex);
553 return -EEXIST;
554 }
555
556 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
557 FX_IMAGE_ALIGN);
558 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
559
6aa8b732
AK		 560 r = kvm_arch_ops->vcpu_create(vcpu);
561 if (r < 0)
562 goto out_free_vcpus;
563
8018c27b
IM		 564 r = kvm_mmu_create(vcpu);
565 if (r < 0)
566 goto out_free_vcpus;
6aa8b732 567
8018c27b
IM		 568 kvm_arch_ops->vcpu_load(vcpu);
569 r = kvm_mmu_setup(vcpu);
6aa8b732 570 if (r >= 0)
8018c27b 571 r = kvm_arch_ops->vcpu_setup(vcpu);
6aa8b732
AK		 572 vcpu_put(vcpu);
573
574 if (r < 0)
575 goto out_free_vcpus;
576
577 return 0;
578
579out_free_vcpus:
580 kvm_free_vcpu(vcpu);
581 mutex_unlock(&vcpu->mutex);
582out:
583 return r;
584}
585
586/*
587 * Allocate some memory and give it an address in the guest physical address
588 * space.
589 *
590 * Discontiguous memory is allowed, mostly for framebuffers.
591 */
592static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm,
593 struct kvm_memory_region *mem)
594{
595 int r;
596 gfn_t base_gfn;
597 unsigned long npages;
598 unsigned long i;
599 struct kvm_memory_slot *memslot;
600 struct kvm_memory_slot old, new;
601 int memory_config_version;
602
603 r = -EINVAL;
604 /* General sanity checks */
605 if (mem->memory_size & (PAGE_SIZE - 1))
606 goto out;
607 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
608 goto out;
609 if (mem->slot >= KVM_MEMORY_SLOTS)
610 goto out;
611 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
612 goto out;
613
614 memslot = &kvm->memslots[mem->slot];
615 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
616 npages = mem->memory_size >> PAGE_SHIFT;
617
618 if (!npages)
619 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
620
621raced:
622 spin_lock(&kvm->lock);
623
624 memory_config_version = kvm->memory_config_version;
625 new = old = *memslot;
626
627 new.base_gfn = base_gfn;
628 new.npages = npages;
629 new.flags = mem->flags;
630
631 /* Disallow changing a memory slot's size. */
632 r = -EINVAL;
633 if (npages && old.npages && npages != old.npages)
634 goto out_unlock;
635
636 /* Check for overlaps */
637 r = -EEXIST;
638 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
639 struct kvm_memory_slot *s = &kvm->memslots[i];
640
641 if (s == memslot)
642 continue;
643 if (!((base_gfn + npages <= s->base_gfn) ||
644 (base_gfn >= s->base_gfn + s->npages)))
645 goto out_unlock;
646 }
647 /*
648 * Do memory allocations outside lock. memory_config_version will
649 * detect any races.
650 */
651 spin_unlock(&kvm->lock);
652
653 /* Deallocate if slot is being removed */
654 if (!npages)
8b6d44c7 655 new.phys_mem = NULL;
6aa8b732
AK		 656
657 /* Free page dirty bitmap if unneeded */
658 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
8b6d44c7 659 new.dirty_bitmap = NULL;
6aa8b732
AK		 660
661 r = -ENOMEM;
662
663 /* Allocate if a slot is being created */
664 if (npages && !new.phys_mem) {
665 new.phys_mem = vmalloc(npages * sizeof(struct page *));
666
667 if (!new.phys_mem)
668 goto out_free;
669
670 memset(new.phys_mem, 0, npages * sizeof(struct page *));
671 for (i = 0; i < npages; ++i) {
672 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
673 | __GFP_ZERO);
674 if (!new.phys_mem[i])
675 goto out_free;
cd4a4e53 676 new.phys_mem[i]->private = 0;
6aa8b732
AK		 677 }
678 }
679
680 /* Allocate page dirty bitmap if needed */
681 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
682 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
683
684 new.dirty_bitmap = vmalloc(dirty_bytes);
685 if (!new.dirty_bitmap)
686 goto out_free;
687 memset(new.dirty_bitmap, 0, dirty_bytes);
688 }
689
690 spin_lock(&kvm->lock);
691
692 if (memory_config_version != kvm->memory_config_version) {
693 spin_unlock(&kvm->lock);
694 kvm_free_physmem_slot(&new, &old);
695 goto raced;
696 }
697
698 r = -EAGAIN;
699 if (kvm->busy)
700 goto out_unlock;
701
702 if (mem->slot >= kvm->nmemslots)
703 kvm->nmemslots = mem->slot + 1;
704
705 *memslot = new;
706 ++kvm->memory_config_version;
707
708 spin_unlock(&kvm->lock);
709
710 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
711 struct kvm_vcpu *vcpu;
712
713 vcpu = vcpu_load(kvm, i);
714 if (!vcpu)
715 continue;
716 kvm_mmu_reset_context(vcpu);
717 vcpu_put(vcpu);
718 }
719
720 kvm_free_physmem_slot(&old, &new);
721 return 0;
722
723out_unlock:
724 spin_unlock(&kvm->lock);
725out_free:
726 kvm_free_physmem_slot(&new, &old);
727out:
728 return r;
729}
730
714b93da
AK		 731static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
732{
733 spin_lock(&vcpu->kvm->lock);
734 kvm_mmu_slot_remove_write_access(vcpu, slot);
735 spin_unlock(&vcpu->kvm->lock);
736}
737
6aa8b732
AK		 738/*
739 * Get (and clear) the dirty memory log for a memory slot.
740 */
741static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
742 struct kvm_dirty_log *log)
743{
744 struct kvm_memory_slot *memslot;
745 int r, i;
746 int n;
714b93da 747 int cleared;
6aa8b732
AK		 748 unsigned long any = 0;
749
750 spin_lock(&kvm->lock);
751
752 /*
753 * Prevent changes to guest memory configuration even while the lock
754 * is not taken.
755 */
756 ++kvm->busy;
757 spin_unlock(&kvm->lock);
758 r = -EINVAL;
759 if (log->slot >= KVM_MEMORY_SLOTS)
760 goto out;
761
762 memslot = &kvm->memslots[log->slot];
763 r = -ENOENT;
764 if (!memslot->dirty_bitmap)
765 goto out;
766
767 n = ALIGN(memslot->npages, 8) / 8;
768
769 for (i = 0; !any && i < n; ++i)
770 any = memslot->dirty_bitmap[i];
771
772 r = -EFAULT;
773 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
774 goto out;
775
776
777 if (any) {
714b93da 778 cleared = 0;
6aa8b732
AK		 779 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
780 struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
781
782 if (!vcpu)
783 continue;
714b93da
AK		 784 if (!cleared) {
785 do_remove_write_access(vcpu, log->slot);
786 memset(memslot->dirty_bitmap, 0, n);
787 cleared = 1;
788 }
6aa8b732
AK		 789 kvm_arch_ops->tlb_flush(vcpu);
790 vcpu_put(vcpu);
791 }
792 }
793
794 r = 0;
795
796out:
797 spin_lock(&kvm->lock);
798 --kvm->busy;
799 spin_unlock(&kvm->lock);
800 return r;
801}
802
803struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
804{
805 int i;
806
807 for (i = 0; i < kvm->nmemslots; ++i) {
808 struct kvm_memory_slot *memslot = &kvm->memslots[i];
809
810 if (gfn >= memslot->base_gfn
811 && gfn < memslot->base_gfn + memslot->npages)
812 return memslot;
813 }
8b6d44c7 814 return NULL;
6aa8b732
AK		 815}
816EXPORT_SYMBOL_GPL(gfn_to_memslot);
817
818void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
819{
820 int i;
8b6d44c7 821 struct kvm_memory_slot *memslot = NULL;
6aa8b732
AK		 822 unsigned long rel_gfn;
823
824 for (i = 0; i < kvm->nmemslots; ++i) {
825 memslot = &kvm->memslots[i];
826
827 if (gfn >= memslot->base_gfn
828 && gfn < memslot->base_gfn + memslot->npages) {
829
830 if (!memslot || !memslot->dirty_bitmap)
831 return;
832
833 rel_gfn = gfn - memslot->base_gfn;
834
835 /* avoid RMW */
836 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
837 set_bit(rel_gfn, memslot->dirty_bitmap);
838 return;
839 }
840 }
841}
842
843static int emulator_read_std(unsigned long addr,
844 unsigned long *val,
845 unsigned int bytes,
846 struct x86_emulate_ctxt *ctxt)
847{
848 struct kvm_vcpu *vcpu = ctxt->vcpu;
849 void *data = val;
850
851 while (bytes) {
852 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
853 unsigned offset = addr & (PAGE_SIZE-1);
854 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
855 unsigned long pfn;
856 struct kvm_memory_slot *memslot;
857 void *page;
858
859 if (gpa == UNMAPPED_GVA)
860 return X86EMUL_PROPAGATE_FAULT;
861 pfn = gpa >> PAGE_SHIFT;
862 memslot = gfn_to_memslot(vcpu->kvm, pfn);
863 if (!memslot)
864 return X86EMUL_UNHANDLEABLE;
865 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
866
867 memcpy(data, page + offset, tocopy);
868
869 kunmap_atomic(page, KM_USER0);
870
871 bytes -= tocopy;
872 data += tocopy;
873 addr += tocopy;
874 }
875
876 return X86EMUL_CONTINUE;
877}
878
879static int emulator_write_std(unsigned long addr,
880 unsigned long val,
881 unsigned int bytes,
882 struct x86_emulate_ctxt *ctxt)
883{
884 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
885 addr, bytes);
886 return X86EMUL_UNHANDLEABLE;
887}
888
889static int emulator_read_emulated(unsigned long addr,
890 unsigned long *val,
891 unsigned int bytes,
892 struct x86_emulate_ctxt *ctxt)
893{
894 struct kvm_vcpu *vcpu = ctxt->vcpu;
895
896 if (vcpu->mmio_read_completed) {
897 memcpy(val, vcpu->mmio_data, bytes);
898 vcpu->mmio_read_completed = 0;
899 return X86EMUL_CONTINUE;
900 } else if (emulator_read_std(addr, val, bytes, ctxt)
901 == X86EMUL_CONTINUE)
902 return X86EMUL_CONTINUE;
903 else {
904 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
905 if (gpa == UNMAPPED_GVA)
906 return vcpu_printf(vcpu, "not present\n"), X86EMUL_PROPAGATE_FAULT;
907 vcpu->mmio_needed = 1;
908 vcpu->mmio_phys_addr = gpa;
909 vcpu->mmio_size = bytes;
910 vcpu->mmio_is_write = 0;
911
912 return X86EMUL_UNHANDLEABLE;
913 }
914}
915
da4a00f0
AK		 916static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
917 unsigned long val, int bytes)
918{
919 struct kvm_memory_slot *m;
920 struct page *page;
921 void *virt;
922
923 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
924 return 0;
925 m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
926 if (!m)
927 return 0;
928 page = gfn_to_page(m, gpa >> PAGE_SHIFT);
929 kvm_mmu_pre_write(vcpu, gpa, bytes);
930 virt = kmap_atomic(page, KM_USER0);
931 memcpy(virt + offset_in_page(gpa), &val, bytes);
932 kunmap_atomic(virt, KM_USER0);
933 kvm_mmu_post_write(vcpu, gpa, bytes);
934 return 1;
935}
936
6aa8b732
AK		 937static int emulator_write_emulated(unsigned long addr,
938 unsigned long val,
939 unsigned int bytes,
940 struct x86_emulate_ctxt *ctxt)
941{
942 struct kvm_vcpu *vcpu = ctxt->vcpu;
943 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
944
945 if (gpa == UNMAPPED_GVA)
946 return X86EMUL_PROPAGATE_FAULT;
947
da4a00f0
AK		 948 if (emulator_write_phys(vcpu, gpa, val, bytes))
949 return X86EMUL_CONTINUE;
950
6aa8b732
AK		 951 vcpu->mmio_needed = 1;
952 vcpu->mmio_phys_addr = gpa;
953 vcpu->mmio_size = bytes;
954 vcpu->mmio_is_write = 1;
955 memcpy(vcpu->mmio_data, &val, bytes);
956
957 return X86EMUL_CONTINUE;
958}
959
960static int emulator_cmpxchg_emulated(unsigned long addr,
961 unsigned long old,
962 unsigned long new,
963 unsigned int bytes,
964 struct x86_emulate_ctxt *ctxt)
965{
966 static int reported;
967
968 if (!reported) {
969 reported = 1;
970 printk(KERN_WARNING "kvm: emulating exchange as write\n");
971 }
972 return emulator_write_emulated(addr, new, bytes, ctxt);
973}
974
32b35627
AK		 975#ifdef CONFIG_X86_32
976
977static int emulator_cmpxchg8b_emulated(unsigned long addr,
978 unsigned long old_lo,
979 unsigned long old_hi,
980 unsigned long new_lo,
981 unsigned long new_hi,
982 struct x86_emulate_ctxt *ctxt)
983{
984 static int reported;
985 int r;
986
987 if (!reported) {
988 reported = 1;
989 printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
990 }
991 r = emulator_write_emulated(addr, new_lo, 4, ctxt);
992 if (r != X86EMUL_CONTINUE)
993 return r;
994 return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
995}
996
997#endif
998
6aa8b732
AK		 999static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1000{
1001 return kvm_arch_ops->get_segment_base(vcpu, seg);
1002}
1003
1004int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1005{
6aa8b732
AK		 1006 return X86EMUL_CONTINUE;
1007}
1008
1009int emulate_clts(struct kvm_vcpu *vcpu)
1010{
399badf3 1011 unsigned long cr0;
6aa8b732 1012
399badf3
AK		 1013 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1014 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
6aa8b732
AK		 1015 kvm_arch_ops->set_cr0(vcpu, cr0);
1016 return X86EMUL_CONTINUE;
1017}
1018
1019int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1020{
1021 struct kvm_vcpu *vcpu = ctxt->vcpu;
1022
1023 switch (dr) {
1024 case 0 ... 3:
1025 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1026 return X86EMUL_CONTINUE;
1027 default:
1028 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1029 __FUNCTION__, dr);
1030 return X86EMUL_UNHANDLEABLE;
1031 }
1032}
1033
1034int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1035{
1036 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1037 int exception;
1038
1039 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1040 if (exception) {
1041 /* FIXME: better handling */
1042 return X86EMUL_UNHANDLEABLE;
1043 }
1044 return X86EMUL_CONTINUE;
1045}
1046
1047static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1048{
1049 static int reported;
1050 u8 opcodes[4];
1051 unsigned long rip = ctxt->vcpu->rip;
1052 unsigned long rip_linear;
1053
1054 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1055
1056 if (reported)
1057 return;
1058
1059 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1060
1061 printk(KERN_ERR "emulation failed but !mmio_needed?"
1062 " rip %lx %02x %02x %02x %02x\n",
1063 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1064 reported = 1;
1065}
1066
1067struct x86_emulate_ops emulate_ops = {
1068 .read_std = emulator_read_std,
1069 .write_std = emulator_write_std,
1070 .read_emulated = emulator_read_emulated,
1071 .write_emulated = emulator_write_emulated,
1072 .cmpxchg_emulated = emulator_cmpxchg_emulated,
32b35627
AK		 1073#ifdef CONFIG_X86_32
1074 .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated,
1075#endif
6aa8b732
AK		 1076};
1077
1078int emulate_instruction(struct kvm_vcpu *vcpu,
1079 struct kvm_run *run,
1080 unsigned long cr2,
1081 u16 error_code)
1082{
1083 struct x86_emulate_ctxt emulate_ctxt;
1084 int r;
1085 int cs_db, cs_l;
1086
1087 kvm_arch_ops->cache_regs(vcpu);
1088
1089 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1090
1091 emulate_ctxt.vcpu = vcpu;
1092 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1093 emulate_ctxt.cr2 = cr2;
1094 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1095 ? X86EMUL_MODE_REAL : cs_l
1096 ? X86EMUL_MODE_PROT64 : cs_db
1097 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1098
1099 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1100 emulate_ctxt.cs_base = 0;
1101 emulate_ctxt.ds_base = 0;
1102 emulate_ctxt.es_base = 0;
1103 emulate_ctxt.ss_base = 0;
1104 } else {
1105 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1106 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1107 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1108 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1109 }
1110
1111 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1112 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1113
1114 vcpu->mmio_is_write = 0;
1115 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1116
1117 if ((r || vcpu->mmio_is_write) && run) {
1118 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1119 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1120 run->mmio.len = vcpu->mmio_size;
1121 run->mmio.is_write = vcpu->mmio_is_write;
1122 }
1123
1124 if (r) {
a436036b
AK		 1125 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1126 return EMULATE_DONE;
6aa8b732
AK		 1127 if (!vcpu->mmio_needed) {
1128 report_emulation_failure(&emulate_ctxt);
1129 return EMULATE_FAIL;
1130 }
1131 return EMULATE_DO_MMIO;
1132 }
1133
1134 kvm_arch_ops->decache_regs(vcpu);
1135 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1136
1137 if (vcpu->mmio_is_write)
1138 return EMULATE_DO_MMIO;
1139
1140 return EMULATE_DONE;
1141}
1142EXPORT_SYMBOL_GPL(emulate_instruction);
1143
1144static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1145{
1146 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1147}
1148
1149void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1150{
1151 struct descriptor_table dt = { limit, base };
1152
1153 kvm_arch_ops->set_gdt(vcpu, &dt);
1154}
1155
1156void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1157{
1158 struct descriptor_table dt = { limit, base };
1159
1160 kvm_arch_ops->set_idt(vcpu, &dt);
1161}
1162
1163void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1164 unsigned long *rflags)
1165{
1166 lmsw(vcpu, msw);
1167 *rflags = kvm_arch_ops->get_rflags(vcpu);
1168}
1169
1170unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1171{
399badf3 1172 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1173 switch (cr) {
1174 case 0:
1175 return vcpu->cr0;
1176 case 2:
1177 return vcpu->cr2;
1178 case 3:
1179 return vcpu->cr3;
1180 case 4:
1181 return vcpu->cr4;
1182 default:
1183 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1184 return 0;
1185 }
1186}
1187
1188void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1189 unsigned long *rflags)
1190{
1191 switch (cr) {
1192 case 0:
1193 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1194 *rflags = kvm_arch_ops->get_rflags(vcpu);
1195 break;
1196 case 2:
1197 vcpu->cr2 = val;
1198 break;
1199 case 3:
1200 set_cr3(vcpu, val);
1201 break;
1202 case 4:
1203 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1204 break;
1205 default:
1206 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1207 }
1208}
1209
3bab1f5d
AK		 1210int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1211{
1212 u64 data;
1213
1214 switch (msr) {
1215 case 0xc0010010: /* SYSCFG */
1216 case 0xc0010015: /* HWCR */
1217 case MSR_IA32_PLATFORM_ID:
1218 case MSR_IA32_P5_MC_ADDR:
1219 case MSR_IA32_P5_MC_TYPE:
1220 case MSR_IA32_MC0_CTL:
1221 case MSR_IA32_MCG_STATUS:
1222 case MSR_IA32_MCG_CAP:
1223 case MSR_IA32_MC0_MISC:
1224 case MSR_IA32_MC0_MISC+4:
1225 case MSR_IA32_MC0_MISC+8:
1226 case MSR_IA32_MC0_MISC+12:
1227 case MSR_IA32_MC0_MISC+16:
1228 case MSR_IA32_UCODE_REV:
a8d13ea2 1229 case MSR_IA32_PERF_STATUS:
3bab1f5d
AK		 1230 /* MTRR registers */
1231 case 0xfe:
1232 case 0x200 ... 0x2ff:
1233 data = 0;
1234 break;
a8d13ea2
AK		 1235 case 0xcd: /* fsb frequency */
1236 data = 3;
1237 break;
3bab1f5d
AK		 1238 case MSR_IA32_APICBASE:
1239 data = vcpu->apic_base;
1240 break;
6f00e68f
AK		 1241 case MSR_IA32_MISC_ENABLE:
1242 data = vcpu->ia32_misc_enable_msr;
1243 break;
3bab1f5d
AK		 1244#ifdef CONFIG_X86_64
1245 case MSR_EFER:
1246 data = vcpu->shadow_efer;
1247 break;
1248#endif
1249 default:
1250 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1251 return 1;
1252 }
1253 *pdata = data;
1254 return 0;
1255}
1256EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1257
6aa8b732
AK		 1258/*
1259 * Reads an msr value (of 'msr_index') into 'pdata'.
1260 * Returns 0 on success, non-0 otherwise.
1261 * Assumes vcpu_load() was already called.
1262 */
1263static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1264{
1265 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1266}
1267
05b3e0c2 1268#ifdef CONFIG_X86_64
6aa8b732 1269
3bab1f5d 1270static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
6aa8b732 1271{
6aa8b732
AK		 1272 if (efer & EFER_RESERVED_BITS) {
1273 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1274 efer);
1275 inject_gp(vcpu);
1276 return;
1277 }
1278
1279 if (is_paging(vcpu)
1280 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1281 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1282 inject_gp(vcpu);
1283 return;
1284 }
1285
7725f0ba
AK		 1286 kvm_arch_ops->set_efer(vcpu, efer);
1287
6aa8b732
AK		 1288 efer &= ~EFER_LMA;
1289 efer |= vcpu->shadow_efer & EFER_LMA;
1290
1291 vcpu->shadow_efer = efer;
6aa8b732 1292}
6aa8b732
AK		 1293
1294#endif
1295
3bab1f5d
AK		 1296int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1297{
1298 switch (msr) {
1299#ifdef CONFIG_X86_64
1300 case MSR_EFER:
1301 set_efer(vcpu, data);
1302 break;
1303#endif
1304 case MSR_IA32_MC0_STATUS:
1305 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1306 __FUNCTION__, data);
1307 break;
1308 case MSR_IA32_UCODE_REV:
1309 case MSR_IA32_UCODE_WRITE:
1310 case 0x200 ... 0x2ff: /* MTRRs */
1311 break;
1312 case MSR_IA32_APICBASE:
1313 vcpu->apic_base = data;
1314 break;
6f00e68f
AK		 1315 case MSR_IA32_MISC_ENABLE:
1316 vcpu->ia32_misc_enable_msr = data;
1317 break;
3bab1f5d
AK		 1318 default:
1319 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1320 return 1;
1321 }
1322 return 0;
1323}
1324EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1325
6aa8b732
AK		 1326/*
1327 * Writes msr value into into the appropriate "register".
1328 * Returns 0 on success, non-0 otherwise.
1329 * Assumes vcpu_load() was already called.
1330 */
1331static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1332{
1333 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1334}
1335
1336void kvm_resched(struct kvm_vcpu *vcpu)
1337{
1338 vcpu_put(vcpu);
1339 cond_resched();
1340 /* Cannot fail - no vcpu unplug yet. */
1341 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1342}
1343EXPORT_SYMBOL_GPL(kvm_resched);
1344
1345void load_msrs(struct vmx_msr_entry *e, int n)
1346{
1347 int i;
1348
1349 for (i = 0; i < n; ++i)
1350 wrmsrl(e[i].index, e[i].data);
1351}
1352EXPORT_SYMBOL_GPL(load_msrs);
1353
1354void save_msrs(struct vmx_msr_entry *e, int n)
1355{
1356 int i;
1357
1358 for (i = 0; i < n; ++i)
1359 rdmsrl(e[i].index, e[i].data);
1360}
1361EXPORT_SYMBOL_GPL(save_msrs);
1362
1363static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1364{
1365 struct kvm_vcpu *vcpu;
1366 int r;
1367
5aacf0ca 1368 if (!valid_vcpu(kvm_run->vcpu))
6aa8b732
AK		 1369 return -EINVAL;
1370
1371 vcpu = vcpu_load(kvm, kvm_run->vcpu);
1372 if (!vcpu)
1373 return -ENOENT;
1374
54810342
DL		 1375 /* re-sync apic's tpr */
1376 vcpu->cr8 = kvm_run->cr8;
1377
6aa8b732
AK		 1378 if (kvm_run->emulated) {
1379 kvm_arch_ops->skip_emulated_instruction(vcpu);
1380 kvm_run->emulated = 0;
1381 }
1382
1383 if (kvm_run->mmio_completed) {
1384 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1385 vcpu->mmio_read_completed = 1;
1386 }
1387
1388 vcpu->mmio_needed = 0;
1389
1390 r = kvm_arch_ops->run(vcpu, kvm_run);
1391
1392 vcpu_put(vcpu);
1393 return r;
1394}
1395
1396static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1397{
1398 struct kvm_vcpu *vcpu;
1399
5aacf0ca 1400 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1401 return -EINVAL;
1402
1403 vcpu = vcpu_load(kvm, regs->vcpu);
1404 if (!vcpu)
1405 return -ENOENT;
1406
1407 kvm_arch_ops->cache_regs(vcpu);
1408
1409 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1410 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1411 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1412 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1413 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1414 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1415 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1416 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
05b3e0c2 1417#ifdef CONFIG_X86_64
6aa8b732
AK		 1418 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1419 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1420 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1421 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1422 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1423 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1424 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1425 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1426#endif
1427
1428 regs->rip = vcpu->rip;
1429 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1430
1431 /*
1432 * Don't leak debug flags in case they were set for guest debugging
1433 */
1434 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1435 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1436
1437 vcpu_put(vcpu);
1438
1439 return 0;
1440}
1441
1442static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1443{
1444 struct kvm_vcpu *vcpu;
1445
5aacf0ca 1446 if (!valid_vcpu(regs->vcpu))
6aa8b732
AK		 1447 return -EINVAL;
1448
1449 vcpu = vcpu_load(kvm, regs->vcpu);
1450 if (!vcpu)
1451 return -ENOENT;
1452
1453 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1454 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1455 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1456 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1457 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1458 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1459 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1460 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
05b3e0c2 1461#ifdef CONFIG_X86_64
6aa8b732
AK		 1462 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1463 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1464 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1465 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1466 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1467 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1468 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1469 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1470#endif
1471
1472 vcpu->rip = regs->rip;
1473 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1474
1475 kvm_arch_ops->decache_regs(vcpu);
1476
1477 vcpu_put(vcpu);
1478
1479 return 0;
1480}
1481
1482static void get_segment(struct kvm_vcpu *vcpu,
1483 struct kvm_segment *var, int seg)
1484{
1485 return kvm_arch_ops->get_segment(vcpu, var, seg);
1486}
1487
1488static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1489{
1490 struct kvm_vcpu *vcpu;
1491 struct descriptor_table dt;
1492
5aacf0ca 1493 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1494 return -EINVAL;
1495 vcpu = vcpu_load(kvm, sregs->vcpu);
1496 if (!vcpu)
1497 return -ENOENT;
1498
1499 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1500 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1501 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1502 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1503 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1504 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1505
1506 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1507 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1508
1509 kvm_arch_ops->get_idt(vcpu, &dt);
1510 sregs->idt.limit = dt.limit;
1511 sregs->idt.base = dt.base;
1512 kvm_arch_ops->get_gdt(vcpu, &dt);
1513 sregs->gdt.limit = dt.limit;
1514 sregs->gdt.base = dt.base;
1515
399badf3 1516 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
6aa8b732
AK		 1517 sregs->cr0 = vcpu->cr0;
1518 sregs->cr2 = vcpu->cr2;
1519 sregs->cr3 = vcpu->cr3;
1520 sregs->cr4 = vcpu->cr4;
1521 sregs->cr8 = vcpu->cr8;
1522 sregs->efer = vcpu->shadow_efer;
1523 sregs->apic_base = vcpu->apic_base;
1524
1525 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1526 sizeof sregs->interrupt_bitmap);
1527
1528 vcpu_put(vcpu);
1529
1530 return 0;
1531}
1532
1533static void set_segment(struct kvm_vcpu *vcpu,
1534 struct kvm_segment *var, int seg)
1535{
1536 return kvm_arch_ops->set_segment(vcpu, var, seg);
1537}
1538
1539static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1540{
1541 struct kvm_vcpu *vcpu;
1542 int mmu_reset_needed = 0;
1543 int i;
1544 struct descriptor_table dt;
1545
5aacf0ca 1546 if (!valid_vcpu(sregs->vcpu))
6aa8b732
AK		 1547 return -EINVAL;
1548 vcpu = vcpu_load(kvm, sregs->vcpu);
1549 if (!vcpu)
1550 return -ENOENT;
1551
1552 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1553 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1554 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1555 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1556 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1557 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1558
1559 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1560 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1561
1562 dt.limit = sregs->idt.limit;
1563 dt.base = sregs->idt.base;
1564 kvm_arch_ops->set_idt(vcpu, &dt);
1565 dt.limit = sregs->gdt.limit;
1566 dt.base = sregs->gdt.base;
1567 kvm_arch_ops->set_gdt(vcpu, &dt);
1568
1569 vcpu->cr2 = sregs->cr2;
1570 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1571 vcpu->cr3 = sregs->cr3;
1572
1573 vcpu->cr8 = sregs->cr8;
1574
1575 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
05b3e0c2 1576#ifdef CONFIG_X86_64
6aa8b732
AK		 1577 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1578#endif
1579 vcpu->apic_base = sregs->apic_base;
1580
399badf3
AK		 1581 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1582
6aa8b732
AK		 1583 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1584 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1585
1586 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1587 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1b0973bd
AK		 1588 if (!is_long_mode(vcpu) && is_pae(vcpu))
1589 load_pdptrs(vcpu, vcpu->cr3);
6aa8b732
AK		 1590
1591 if (mmu_reset_needed)
1592 kvm_mmu_reset_context(vcpu);
1593
1594 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1595 sizeof vcpu->irq_pending);
1596 vcpu->irq_summary = 0;
1597 for (i = 0; i < NR_IRQ_WORDS; ++i)
1598 if (vcpu->irq_pending[i])
1599 __set_bit(i, &vcpu->irq_summary);
1600
1601 vcpu_put(vcpu);
1602
1603 return 0;
1604}
1605
1606/*
1607 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1608 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
bf591b24
MR		 1609 *
1610 * This list is modified at module load time to reflect the
1611 * capabilities of the host cpu.
6aa8b732
AK		 1612 */
1613static u32 msrs_to_save[] = {
1614 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1615 MSR_K6_STAR,
05b3e0c2 1616#ifdef CONFIG_X86_64
6aa8b732
AK		 1617 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1618#endif
1619 MSR_IA32_TIME_STAMP_COUNTER,
1620};
1621
bf591b24
MR		 1622static unsigned num_msrs_to_save;
1623
6f00e68f
AK		 1624static u32 emulated_msrs[] = {
1625 MSR_IA32_MISC_ENABLE,
1626};
1627
bf591b24
MR		 1628static __init void kvm_init_msr_list(void)
1629{
1630 u32 dummy[2];
1631 unsigned i, j;
1632
1633 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1634 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1635 continue;
1636 if (j < i)
1637 msrs_to_save[j] = msrs_to_save[i];
1638 j++;
1639 }
1640 num_msrs_to_save = j;
1641}
6aa8b732
AK		 1642
1643/*
1644 * Adapt set_msr() to msr_io()'s calling convention
1645 */
1646static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1647{
1648 return set_msr(vcpu, index, *data);
1649}
1650
1651/*
1652 * Read or write a bunch of msrs. All parameters are kernel addresses.
1653 *
1654 * @return number of msrs set successfully.
1655 */
1656static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1657 struct kvm_msr_entry *entries,
1658 int (*do_msr)(struct kvm_vcpu *vcpu,
1659 unsigned index, u64 *data))
1660{
1661 struct kvm_vcpu *vcpu;
1662 int i;
1663
5aacf0ca 1664 if (!valid_vcpu(msrs->vcpu))
6aa8b732
AK		 1665 return -EINVAL;
1666
1667 vcpu = vcpu_load(kvm, msrs->vcpu);
1668 if (!vcpu)
1669 return -ENOENT;
1670
1671 for (i = 0; i < msrs->nmsrs; ++i)
1672 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1673 break;
1674
1675 vcpu_put(vcpu);
1676
1677 return i;
1678}
1679
1680/*
1681 * Read or write a bunch of msrs. Parameters are user addresses.
1682 *
1683 * @return number of msrs set successfully.
1684 */
1685static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1686 int (*do_msr)(struct kvm_vcpu *vcpu,
1687 unsigned index, u64 *data),
1688 int writeback)
1689{
1690 struct kvm_msrs msrs;
1691 struct kvm_msr_entry *entries;
1692 int r, n;
1693 unsigned size;
1694
1695 r = -EFAULT;
1696 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1697 goto out;
1698
1699 r = -E2BIG;
1700 if (msrs.nmsrs >= MAX_IO_MSRS)
1701 goto out;
1702
1703 r = -ENOMEM;
1704 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1705 entries = vmalloc(size);
1706 if (!entries)
1707 goto out;
1708
1709 r = -EFAULT;
1710 if (copy_from_user(entries, user_msrs->entries, size))
1711 goto out_free;
1712
1713 r = n = __msr_io(kvm, &msrs, entries, do_msr);
1714 if (r < 0)
1715 goto out_free;
1716
1717 r = -EFAULT;
1718 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1719 goto out_free;
1720
1721 r = n;
1722
1723out_free:
1724 vfree(entries);
1725out:
1726 return r;
1727}
1728
1729/*
1730 * Translate a guest virtual address to a guest physical address.
1731 */
1732static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1733{
1734 unsigned long vaddr = tr->linear_address;
1735 struct kvm_vcpu *vcpu;
1736 gpa_t gpa;
1737
1738 vcpu = vcpu_load(kvm, tr->vcpu);
1739 if (!vcpu)
1740 return -ENOENT;
1741 spin_lock(&kvm->lock);
1742 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1743 tr->physical_address = gpa;
1744 tr->valid = gpa != UNMAPPED_GVA;
1745 tr->writeable = 1;
1746 tr->usermode = 0;
1747 spin_unlock(&kvm->lock);
1748 vcpu_put(vcpu);
1749
1750 return 0;
1751}
1752
1753static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1754{
1755 struct kvm_vcpu *vcpu;
1756
5aacf0ca 1757 if (!valid_vcpu(irq->vcpu))
6aa8b732
AK		 1758 return -EINVAL;
1759 if (irq->irq < 0 || irq->irq >= 256)
1760 return -EINVAL;
1761 vcpu = vcpu_load(kvm, irq->vcpu);
1762 if (!vcpu)
1763 return -ENOENT;
1764
1765 set_bit(irq->irq, vcpu->irq_pending);
1766 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1767
1768 vcpu_put(vcpu);
1769
1770 return 0;
1771}
1772
1773static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1774 struct kvm_debug_guest *dbg)
1775{
1776 struct kvm_vcpu *vcpu;
1777 int r;
1778
5aacf0ca 1779 if (!valid_vcpu(dbg->vcpu))
6aa8b732
AK		 1780 return -EINVAL;
1781 vcpu = vcpu_load(kvm, dbg->vcpu);
1782 if (!vcpu)
1783 return -ENOENT;
1784
1785 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1786
1787 vcpu_put(vcpu);
1788
1789 return r;
1790}
1791
1792static long kvm_dev_ioctl(struct file *filp,
1793 unsigned int ioctl, unsigned long arg)
1794{
1795 struct kvm *kvm = filp->private_data;
2f366987 1796 void __user *argp = (void __user *)arg;
6aa8b732
AK		 1797 int r = -EINVAL;
1798
1799 switch (ioctl) {
0b76e20b
AK		 1800 case KVM_GET_API_VERSION:
1801 r = KVM_API_VERSION;
1802 break;
6aa8b732
AK		 1803 case KVM_CREATE_VCPU: {
1804 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1805 if (r)
1806 goto out;
1807 break;
1808 }
1809 case KVM_RUN: {
1810 struct kvm_run kvm_run;
1811
1812 r = -EFAULT;
2f366987 1813 if (copy_from_user(&kvm_run, argp, sizeof kvm_run))
6aa8b732
AK		 1814 goto out;
1815 r = kvm_dev_ioctl_run(kvm, &kvm_run);
c1150d8c 1816 if (r < 0 && r != -EINTR)
6aa8b732 1817 goto out;
2f366987 1818 if (copy_to_user(argp, &kvm_run, sizeof kvm_run)) {
c1150d8c 1819 r = -EFAULT;
6aa8b732 1820 goto out;
c1150d8c 1821 }
6aa8b732
AK		 1822 break;
1823 }
1824 case KVM_GET_REGS: {
1825 struct kvm_regs kvm_regs;
1826
1827 r = -EFAULT;
2f366987 1828 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732
AK		 1829 goto out;
1830 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
1831 if (r)
1832 goto out;
1833 r = -EFAULT;
2f366987 1834 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
6aa8b732
AK		 1835 goto out;
1836 r = 0;
1837 break;
1838 }
1839 case KVM_SET_REGS: {
1840 struct kvm_regs kvm_regs;
1841
1842 r = -EFAULT;
2f366987 1843 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
6aa8b732
AK		 1844 goto out;
1845 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
1846 if (r)
1847 goto out;
1848 r = 0;
1849 break;
1850 }
1851 case KVM_GET_SREGS: {
1852 struct kvm_sregs kvm_sregs;
1853
1854 r = -EFAULT;
2f366987 1855 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732
AK		 1856 goto out;
1857 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
1858 if (r)
1859 goto out;
1860 r = -EFAULT;
2f366987 1861 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
6aa8b732
AK		 1862 goto out;
1863 r = 0;
1864 break;
1865 }
1866 case KVM_SET_SREGS: {
1867 struct kvm_sregs kvm_sregs;
1868
1869 r = -EFAULT;
2f366987 1870 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
6aa8b732
AK		 1871 goto out;
1872 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
1873 if (r)
1874 goto out;
1875 r = 0;
1876 break;
1877 }
1878 case KVM_TRANSLATE: {
1879 struct kvm_translation tr;
1880
1881 r = -EFAULT;
2f366987 1882 if (copy_from_user(&tr, argp, sizeof tr))
6aa8b732
AK		 1883 goto out;
1884 r = kvm_dev_ioctl_translate(kvm, &tr);
1885 if (r)
1886 goto out;
1887 r = -EFAULT;
2f366987 1888 if (copy_to_user(argp, &tr, sizeof tr))
6aa8b732
AK		 1889 goto out;
1890 r = 0;
1891 break;
1892 }
1893 case KVM_INTERRUPT: {
1894 struct kvm_interrupt irq;
1895
1896 r = -EFAULT;
2f366987 1897 if (copy_from_user(&irq, argp, sizeof irq))
6aa8b732
AK		 1898 goto out;
1899 r = kvm_dev_ioctl_interrupt(kvm, &irq);
1900 if (r)
1901 goto out;
1902 r = 0;
1903 break;
1904 }
1905 case KVM_DEBUG_GUEST: {
1906 struct kvm_debug_guest dbg;
1907
1908 r = -EFAULT;
2f366987 1909 if (copy_from_user(&dbg, argp, sizeof dbg))
6aa8b732
AK		 1910 goto out;
1911 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
1912 if (r)
1913 goto out;
1914 r = 0;
1915 break;
1916 }
1917 case KVM_SET_MEMORY_REGION: {
1918 struct kvm_memory_region kvm_mem;
1919
1920 r = -EFAULT;
2f366987 1921 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
6aa8b732
AK		 1922 goto out;
1923 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
1924 if (r)
1925 goto out;
1926 break;
1927 }
1928 case KVM_GET_DIRTY_LOG: {
1929 struct kvm_dirty_log log;
1930
1931 r = -EFAULT;
2f366987 1932 if (copy_from_user(&log, argp, sizeof log))
6aa8b732
AK		 1933 goto out;
1934 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
1935 if (r)
1936 goto out;
1937 break;
1938 }
1939 case KVM_GET_MSRS:
2f366987 1940 r = msr_io(kvm, argp, get_msr, 1);
6aa8b732
AK		 1941 break;
1942 case KVM_SET_MSRS:
2f366987 1943 r = msr_io(kvm, argp, do_set_msr, 0);
6aa8b732
AK		 1944 break;
1945 case KVM_GET_MSR_INDEX_LIST: {
2f366987 1946 struct kvm_msr_list __user *user_msr_list = argp;
6aa8b732
AK		 1947 struct kvm_msr_list msr_list;
1948 unsigned n;
1949
1950 r = -EFAULT;
1951 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1952 goto out;
1953 n = msr_list.nmsrs;
6f00e68f 1954 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
6aa8b732
AK		 1955 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1956 goto out;
1957 r = -E2BIG;
bf591b24 1958 if (n < num_msrs_to_save)
6aa8b732
AK		 1959 goto out;
1960 r = -EFAULT;
1961 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
bf591b24 1962 num_msrs_to_save * sizeof(u32)))
6aa8b732 1963 goto out;
6f00e68f
AK		 1964 if (copy_to_user(user_msr_list->indices
1965 + num_msrs_to_save * sizeof(u32),
1966 &emulated_msrs,
1967 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
1968 goto out;
6aa8b732 1969 r = 0;
cc1d8955 1970 break;
6aa8b732
AK		 1971 }
1972 default:
1973 ;
1974 }
1975out:
1976 return r;
1977}
1978
1979static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
1980 unsigned long address,
1981 int *type)
1982{
1983 struct kvm *kvm = vma->vm_file->private_data;
1984 unsigned long pgoff;
1985 struct kvm_memory_slot *slot;
1986 struct page *page;
1987
1988 *type = VM_FAULT_MINOR;
1989 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1990 slot = gfn_to_memslot(kvm, pgoff);
1991 if (!slot)
1992 return NOPAGE_SIGBUS;
1993 page = gfn_to_page(slot, pgoff);
1994 if (!page)
1995 return NOPAGE_SIGBUS;
1996 get_page(page);
1997 return page;
1998}
1999
2000static struct vm_operations_struct kvm_dev_vm_ops = {
2001 .nopage = kvm_dev_nopage,
2002};
2003
2004static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
2005{
2006 vma->vm_ops = &kvm_dev_vm_ops;
2007 return 0;
2008}
2009
2010static struct file_operations kvm_chardev_ops = {
2011 .open = kvm_dev_open,
2012 .release = kvm_dev_release,
2013 .unlocked_ioctl = kvm_dev_ioctl,
2014 .compat_ioctl = kvm_dev_ioctl,
2015 .mmap = kvm_dev_mmap,
2016};
2017
2018static struct miscdevice kvm_dev = {
2019 MISC_DYNAMIC_MINOR,
2020 "kvm",
2021 &kvm_chardev_ops,
2022};
2023
2024static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2025 void *v)
2026{
2027 if (val == SYS_RESTART) {
2028 /*
2029 * Some (well, at least mine) BIOSes hang on reboot if
2030 * in vmx root mode.
2031 */
2032 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
8b6d44c7 2033 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2034 }
2035 return NOTIFY_OK;
2036}
2037
2038static struct notifier_block kvm_reboot_notifier = {
2039 .notifier_call = kvm_reboot,
2040 .priority = 0,
2041};
2042
774c47f1
AK		 2043/*
2044 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2045 * cached on it.
2046 */
2047static void decache_vcpus_on_cpu(int cpu)
2048{
2049 struct kvm *vm;
2050 struct kvm_vcpu *vcpu;
2051 int i;
2052
2053 spin_lock(&kvm_lock);
2054 list_for_each_entry(vm, &vm_list, vm_list)
2055 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2056 vcpu = &vm->vcpus[i];
2057 /*
2058 * If the vcpu is locked, then it is running on some
2059 * other cpu and therefore it is not cached on the
2060 * cpu in question.
2061 *
2062 * If it's not locked, check the last cpu it executed
2063 * on.
2064 */
2065 if (mutex_trylock(&vcpu->mutex)) {
2066 if (vcpu->cpu == cpu) {
2067 kvm_arch_ops->vcpu_decache(vcpu);
2068 vcpu->cpu = -1;
2069 }
2070 mutex_unlock(&vcpu->mutex);
2071 }
2072 }
2073 spin_unlock(&kvm_lock);
2074}
2075
2076static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2077 void *v)
2078{
2079 int cpu = (long)v;
2080
2081 switch (val) {
2082 case CPU_DEAD:
2083 case CPU_UP_CANCELED:
2084 decache_vcpus_on_cpu(cpu);
2085 smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
2086 NULL, 0, 1);
2087 break;
2088 case CPU_UP_PREPARE:
2089 smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
2090 NULL, 0, 1);
2091 break;
2092 }
2093 return NOTIFY_OK;
2094}
2095
2096static struct notifier_block kvm_cpu_notifier = {
2097 .notifier_call = kvm_cpu_hotplug,
2098 .priority = 20, /* must be > scheduler priority */
2099};
2100
6aa8b732
AK		 2101static __init void kvm_init_debug(void)
2102{
2103 struct kvm_stats_debugfs_item *p;
2104
8b6d44c7 2105 debugfs_dir = debugfs_create_dir("kvm", NULL);
6aa8b732
AK		 2106 for (p = debugfs_entries; p->name; ++p)
2107 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
2108 p->data);
2109}
2110
2111static void kvm_exit_debug(void)
2112{
2113 struct kvm_stats_debugfs_item *p;
2114
2115 for (p = debugfs_entries; p->name; ++p)
2116 debugfs_remove(p->dentry);
2117 debugfs_remove(debugfs_dir);
2118}
2119
2120hpa_t bad_page_address;
2121
2122int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
2123{
2124 int r;
2125
09db28b8
YI		 2126 if (kvm_arch_ops) {
2127 printk(KERN_ERR "kvm: already loaded the other module\n");
2128 return -EEXIST;
2129 }
2130
e097f35c 2131 if (!ops->cpu_has_kvm_support()) {
6aa8b732
AK		 2132 printk(KERN_ERR "kvm: no hardware support\n");
2133 return -EOPNOTSUPP;
2134 }
e097f35c 2135 if (ops->disabled_by_bios()) {
6aa8b732
AK		 2136 printk(KERN_ERR "kvm: disabled by bios\n");
2137 return -EOPNOTSUPP;
2138 }
2139
e097f35c
YI		 2140 kvm_arch_ops = ops;
2141
6aa8b732
AK		 2142 r = kvm_arch_ops->hardware_setup();
2143 if (r < 0)
2144 return r;
2145
8b6d44c7 2146 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
774c47f1
AK		 2147 r = register_cpu_notifier(&kvm_cpu_notifier);
2148 if (r)
2149 goto out_free_1;
6aa8b732
AK		 2150 register_reboot_notifier(&kvm_reboot_notifier);
2151
2152 kvm_chardev_ops.owner = module;
2153
2154 r = misc_register(&kvm_dev);
2155 if (r) {
2156 printk (KERN_ERR "kvm: misc device register failed\n");
2157 goto out_free;
2158 }
2159
2160 return r;
2161
2162out_free:
2163 unregister_reboot_notifier(&kvm_reboot_notifier);
774c47f1
AK		 2164 unregister_cpu_notifier(&kvm_cpu_notifier);
2165out_free_1:
8b6d44c7 2166 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732
AK		 2167 kvm_arch_ops->hardware_unsetup();
2168 return r;
2169}
2170
2171void kvm_exit_arch(void)
2172{
2173 misc_deregister(&kvm_dev);
2174
2175 unregister_reboot_notifier(&kvm_reboot_notifier);
8b6d44c7 2176 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
6aa8b732 2177 kvm_arch_ops->hardware_unsetup();
09db28b8 2178 kvm_arch_ops = NULL;
6aa8b732
AK		 2179}
2180
2181static __init int kvm_init(void)
2182{
2183 static struct page *bad_page;
2184 int r = 0;
2185
2186 kvm_init_debug();
2187
bf591b24
MR		 2188 kvm_init_msr_list();
2189
6aa8b732
AK		 2190 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2191 r = -ENOMEM;
2192 goto out;
2193 }
2194
2195 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2196 memset(__va(bad_page_address), 0, PAGE_SIZE);
2197
2198 return r;
2199
2200out:
2201 kvm_exit_debug();
2202 return r;
2203}
2204
2205static __exit void kvm_exit(void)
2206{
2207 kvm_exit_debug();
2208 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
2209}
2210
2211module_init(kvm_init)
2212module_exit(kvm_exit)
2213
2214EXPORT_SYMBOL_GPL(kvm_init_arch);
2215EXPORT_SYMBOL_GPL(kvm_exit_arch);
Linux 6.x block layer and io_uring tree(s)