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