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