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