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6aa8b732 AK |
1 | /* |
2 | * Kernel-based Virtual Machine driver for Linux | |
3 | * | |
4 | * This module enables machines with Intel VT-x extensions to run virtual | |
5 | * machines without emulation or binary translation. | |
6 | * | |
7 | * Copyright (C) 2006 Qumranet, Inc. | |
8 | * | |
9 | * Authors: | |
10 | * Avi Kivity <avi@qumranet.com> | |
11 | * Yaniv Kamay <yaniv@qumranet.com> | |
12 | * | |
13 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
14 | * the COPYING file in the top-level directory. | |
15 | * | |
16 | */ | |
17 | ||
18 | #include "kvm.h" | |
19 | ||
20 | #include <linux/kvm.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/errno.h> | |
23 | #include <asm/processor.h> | |
24 | #include <linux/percpu.h> | |
25 | #include <linux/gfp.h> | |
26 | #include <asm/msr.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/miscdevice.h> | |
29 | #include <linux/vmalloc.h> | |
30 | #include <asm/uaccess.h> | |
31 | #include <linux/reboot.h> | |
32 | #include <asm/io.h> | |
33 | #include <linux/debugfs.h> | |
34 | #include <linux/highmem.h> | |
35 | #include <linux/file.h> | |
36 | #include <asm/desc.h> | |
59ae6c6b | 37 | #include <linux/sysdev.h> |
774c47f1 | 38 | #include <linux/cpu.h> |
37e29d90 AK |
39 | #include <linux/fs.h> |
40 | #include <linux/mount.h> | |
6aa8b732 AK |
41 | |
42 | #include "x86_emulate.h" | |
43 | #include "segment_descriptor.h" | |
44 | ||
45 | MODULE_AUTHOR("Qumranet"); | |
46 | MODULE_LICENSE("GPL"); | |
47 | ||
133de902 AK |
48 | static DEFINE_SPINLOCK(kvm_lock); |
49 | static LIST_HEAD(vm_list); | |
50 | ||
6aa8b732 AK |
51 | struct kvm_arch_ops *kvm_arch_ops; |
52 | struct kvm_stat kvm_stat; | |
53 | EXPORT_SYMBOL_GPL(kvm_stat); | |
54 | ||
55 | static struct kvm_stats_debugfs_item { | |
56 | const char *name; | |
57 | u32 *data; | |
58 | struct dentry *dentry; | |
59 | } debugfs_entries[] = { | |
60 | { "pf_fixed", &kvm_stat.pf_fixed }, | |
61 | { "pf_guest", &kvm_stat.pf_guest }, | |
62 | { "tlb_flush", &kvm_stat.tlb_flush }, | |
63 | { "invlpg", &kvm_stat.invlpg }, | |
64 | { "exits", &kvm_stat.exits }, | |
65 | { "io_exits", &kvm_stat.io_exits }, | |
66 | { "mmio_exits", &kvm_stat.mmio_exits }, | |
67 | { "signal_exits", &kvm_stat.signal_exits }, | |
c1150d8c DL |
68 | { "irq_window", &kvm_stat.irq_window_exits }, |
69 | { "halt_exits", &kvm_stat.halt_exits }, | |
70 | { "request_irq", &kvm_stat.request_irq_exits }, | |
6aa8b732 | 71 | { "irq_exits", &kvm_stat.irq_exits }, |
8b6d44c7 | 72 | { NULL, NULL } |
6aa8b732 AK |
73 | }; |
74 | ||
75 | static struct dentry *debugfs_dir; | |
76 | ||
37e29d90 AK |
77 | #define KVMFS_MAGIC 0x19700426 |
78 | struct vfsmount *kvmfs_mnt; | |
79 | ||
6aa8b732 AK |
80 | #define MAX_IO_MSRS 256 |
81 | ||
82 | #define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL | |
83 | #define LMSW_GUEST_MASK 0x0eULL | |
84 | #define CR4_RESEVED_BITS (~((1ULL << 11) - 1)) | |
85 | #define CR8_RESEVED_BITS (~0x0fULL) | |
86 | #define EFER_RESERVED_BITS 0xfffffffffffff2fe | |
87 | ||
05b3e0c2 | 88 | #ifdef CONFIG_X86_64 |
6aa8b732 AK |
89 | // LDT or TSS descriptor in the GDT. 16 bytes. |
90 | struct segment_descriptor_64 { | |
91 | struct segment_descriptor s; | |
92 | u32 base_higher; | |
93 | u32 pad_zero; | |
94 | }; | |
95 | ||
96 | #endif | |
97 | ||
98 | unsigned long segment_base(u16 selector) | |
99 | { | |
100 | struct descriptor_table gdt; | |
101 | struct segment_descriptor *d; | |
102 | unsigned long table_base; | |
103 | typedef unsigned long ul; | |
104 | unsigned long v; | |
105 | ||
106 | if (selector == 0) | |
107 | return 0; | |
108 | ||
109 | asm ("sgdt %0" : "=m"(gdt)); | |
110 | table_base = gdt.base; | |
111 | ||
112 | if (selector & 4) { /* from ldt */ | |
113 | u16 ldt_selector; | |
114 | ||
115 | asm ("sldt %0" : "=g"(ldt_selector)); | |
116 | table_base = segment_base(ldt_selector); | |
117 | } | |
118 | d = (struct segment_descriptor *)(table_base + (selector & ~7)); | |
119 | v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24); | |
05b3e0c2 | 120 | #ifdef CONFIG_X86_64 |
6aa8b732 AK |
121 | if (d->system == 0 |
122 | && (d->type == 2 || d->type == 9 || d->type == 11)) | |
123 | v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32; | |
124 | #endif | |
125 | return v; | |
126 | } | |
127 | EXPORT_SYMBOL_GPL(segment_base); | |
128 | ||
5aacf0ca JM |
129 | static inline int valid_vcpu(int n) |
130 | { | |
131 | return likely(n >= 0 && n < KVM_MAX_VCPUS); | |
132 | } | |
133 | ||
d27d4aca AK |
134 | int kvm_read_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size, |
135 | void *dest) | |
6aa8b732 AK |
136 | { |
137 | unsigned char *host_buf = dest; | |
138 | unsigned long req_size = size; | |
139 | ||
140 | while (size) { | |
141 | hpa_t paddr; | |
142 | unsigned now; | |
143 | unsigned offset; | |
144 | hva_t guest_buf; | |
145 | ||
146 | paddr = gva_to_hpa(vcpu, addr); | |
147 | ||
148 | if (is_error_hpa(paddr)) | |
149 | break; | |
150 | ||
151 | guest_buf = (hva_t)kmap_atomic( | |
152 | pfn_to_page(paddr >> PAGE_SHIFT), | |
153 | KM_USER0); | |
154 | offset = addr & ~PAGE_MASK; | |
155 | guest_buf |= offset; | |
156 | now = min(size, PAGE_SIZE - offset); | |
157 | memcpy(host_buf, (void*)guest_buf, now); | |
158 | host_buf += now; | |
159 | addr += now; | |
160 | size -= now; | |
161 | kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0); | |
162 | } | |
163 | return req_size - size; | |
164 | } | |
165 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
166 | ||
d27d4aca AK |
167 | int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size, |
168 | void *data) | |
6aa8b732 AK |
169 | { |
170 | unsigned char *host_buf = data; | |
171 | unsigned long req_size = size; | |
172 | ||
173 | while (size) { | |
174 | hpa_t paddr; | |
175 | unsigned now; | |
176 | unsigned offset; | |
177 | hva_t guest_buf; | |
178 | ||
179 | paddr = gva_to_hpa(vcpu, addr); | |
180 | ||
181 | if (is_error_hpa(paddr)) | |
182 | break; | |
183 | ||
184 | guest_buf = (hva_t)kmap_atomic( | |
185 | pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0); | |
186 | offset = addr & ~PAGE_MASK; | |
187 | guest_buf |= offset; | |
188 | now = min(size, PAGE_SIZE - offset); | |
189 | memcpy((void*)guest_buf, host_buf, now); | |
190 | host_buf += now; | |
191 | addr += now; | |
192 | size -= now; | |
193 | kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0); | |
194 | } | |
195 | return req_size - size; | |
196 | } | |
197 | EXPORT_SYMBOL_GPL(kvm_write_guest); | |
198 | ||
199 | static int vcpu_slot(struct kvm_vcpu *vcpu) | |
200 | { | |
201 | return vcpu - vcpu->kvm->vcpus; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Switches to specified vcpu, until a matching vcpu_put() | |
206 | */ | |
207 | static struct kvm_vcpu *vcpu_load(struct kvm *kvm, int vcpu_slot) | |
208 | { | |
209 | struct kvm_vcpu *vcpu = &kvm->vcpus[vcpu_slot]; | |
210 | ||
211 | mutex_lock(&vcpu->mutex); | |
212 | if (unlikely(!vcpu->vmcs)) { | |
213 | mutex_unlock(&vcpu->mutex); | |
8b6d44c7 | 214 | return NULL; |
6aa8b732 AK |
215 | } |
216 | return kvm_arch_ops->vcpu_load(vcpu); | |
217 | } | |
218 | ||
219 | static void vcpu_put(struct kvm_vcpu *vcpu) | |
220 | { | |
221 | kvm_arch_ops->vcpu_put(vcpu); | |
6aa8b732 AK |
222 | mutex_unlock(&vcpu->mutex); |
223 | } | |
224 | ||
225 | static int kvm_dev_open(struct inode *inode, struct file *filp) | |
226 | { | |
227 | struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL); | |
228 | int i; | |
229 | ||
230 | if (!kvm) | |
231 | return -ENOMEM; | |
232 | ||
233 | spin_lock_init(&kvm->lock); | |
234 | INIT_LIST_HEAD(&kvm->active_mmu_pages); | |
235 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { | |
236 | struct kvm_vcpu *vcpu = &kvm->vcpus[i]; | |
237 | ||
238 | mutex_init(&vcpu->mutex); | |
133de902 | 239 | vcpu->cpu = -1; |
86a2b42e | 240 | vcpu->kvm = kvm; |
6aa8b732 AK |
241 | vcpu->mmu.root_hpa = INVALID_PAGE; |
242 | INIT_LIST_HEAD(&vcpu->free_pages); | |
133de902 AK |
243 | spin_lock(&kvm_lock); |
244 | list_add(&kvm->vm_list, &vm_list); | |
245 | spin_unlock(&kvm_lock); | |
6aa8b732 AK |
246 | } |
247 | filp->private_data = kvm; | |
248 | return 0; | |
249 | } | |
250 | ||
251 | /* | |
252 | * Free any memory in @free but not in @dont. | |
253 | */ | |
254 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, | |
255 | struct kvm_memory_slot *dont) | |
256 | { | |
257 | int i; | |
258 | ||
259 | if (!dont || free->phys_mem != dont->phys_mem) | |
260 | if (free->phys_mem) { | |
261 | for (i = 0; i < free->npages; ++i) | |
55a54f79 AK |
262 | if (free->phys_mem[i]) |
263 | __free_page(free->phys_mem[i]); | |
6aa8b732 AK |
264 | vfree(free->phys_mem); |
265 | } | |
266 | ||
267 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
268 | vfree(free->dirty_bitmap); | |
269 | ||
8b6d44c7 | 270 | free->phys_mem = NULL; |
6aa8b732 | 271 | free->npages = 0; |
8b6d44c7 | 272 | free->dirty_bitmap = NULL; |
6aa8b732 AK |
273 | } |
274 | ||
275 | static void kvm_free_physmem(struct kvm *kvm) | |
276 | { | |
277 | int i; | |
278 | ||
279 | for (i = 0; i < kvm->nmemslots; ++i) | |
8b6d44c7 | 280 | kvm_free_physmem_slot(&kvm->memslots[i], NULL); |
6aa8b732 AK |
281 | } |
282 | ||
283 | static void kvm_free_vcpu(struct kvm_vcpu *vcpu) | |
284 | { | |
1e8ba6fb IM |
285 | if (!vcpu_load(vcpu->kvm, vcpu_slot(vcpu))) |
286 | return; | |
287 | ||
6aa8b732 | 288 | kvm_mmu_destroy(vcpu); |
08438475 | 289 | vcpu_put(vcpu); |
9ede74e0 | 290 | kvm_arch_ops->vcpu_free(vcpu); |
6aa8b732 AK |
291 | } |
292 | ||
293 | static void kvm_free_vcpus(struct kvm *kvm) | |
294 | { | |
295 | unsigned int i; | |
296 | ||
297 | for (i = 0; i < KVM_MAX_VCPUS; ++i) | |
298 | kvm_free_vcpu(&kvm->vcpus[i]); | |
299 | } | |
300 | ||
301 | static int kvm_dev_release(struct inode *inode, struct file *filp) | |
302 | { | |
303 | struct kvm *kvm = filp->private_data; | |
304 | ||
133de902 AK |
305 | spin_lock(&kvm_lock); |
306 | list_del(&kvm->vm_list); | |
307 | spin_unlock(&kvm_lock); | |
6aa8b732 AK |
308 | kvm_free_vcpus(kvm); |
309 | kvm_free_physmem(kvm); | |
310 | kfree(kvm); | |
311 | return 0; | |
312 | } | |
313 | ||
314 | static void inject_gp(struct kvm_vcpu *vcpu) | |
315 | { | |
316 | kvm_arch_ops->inject_gp(vcpu, 0); | |
317 | } | |
318 | ||
1342d353 AK |
319 | /* |
320 | * Load the pae pdptrs. Return true is they are all valid. | |
321 | */ | |
322 | static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3) | |
6aa8b732 AK |
323 | { |
324 | gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT; | |
1342d353 | 325 | unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2; |
6aa8b732 AK |
326 | int i; |
327 | u64 pdpte; | |
328 | u64 *pdpt; | |
1342d353 | 329 | int ret; |
6aa8b732 AK |
330 | struct kvm_memory_slot *memslot; |
331 | ||
332 | spin_lock(&vcpu->kvm->lock); | |
333 | memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn); | |
334 | /* FIXME: !memslot - emulate? 0xff? */ | |
335 | pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0); | |
336 | ||
1342d353 | 337 | ret = 1; |
6aa8b732 AK |
338 | for (i = 0; i < 4; ++i) { |
339 | pdpte = pdpt[offset + i]; | |
1342d353 AK |
340 | if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) { |
341 | ret = 0; | |
342 | goto out; | |
343 | } | |
6aa8b732 AK |
344 | } |
345 | ||
1342d353 AK |
346 | for (i = 0; i < 4; ++i) |
347 | vcpu->pdptrs[i] = pdpt[offset + i]; | |
348 | ||
349 | out: | |
6aa8b732 AK |
350 | kunmap_atomic(pdpt, KM_USER0); |
351 | spin_unlock(&vcpu->kvm->lock); | |
352 | ||
1342d353 | 353 | return ret; |
6aa8b732 AK |
354 | } |
355 | ||
356 | void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) | |
357 | { | |
358 | if (cr0 & CR0_RESEVED_BITS) { | |
359 | printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n", | |
360 | cr0, vcpu->cr0); | |
361 | inject_gp(vcpu); | |
362 | return; | |
363 | } | |
364 | ||
365 | if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) { | |
366 | printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n"); | |
367 | inject_gp(vcpu); | |
368 | return; | |
369 | } | |
370 | ||
371 | if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) { | |
372 | printk(KERN_DEBUG "set_cr0: #GP, set PG flag " | |
373 | "and a clear PE flag\n"); | |
374 | inject_gp(vcpu); | |
375 | return; | |
376 | } | |
377 | ||
378 | if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) { | |
05b3e0c2 | 379 | #ifdef CONFIG_X86_64 |
6aa8b732 AK |
380 | if ((vcpu->shadow_efer & EFER_LME)) { |
381 | int cs_db, cs_l; | |
382 | ||
383 | if (!is_pae(vcpu)) { | |
384 | printk(KERN_DEBUG "set_cr0: #GP, start paging " | |
385 | "in long mode while PAE is disabled\n"); | |
386 | inject_gp(vcpu); | |
387 | return; | |
388 | } | |
389 | kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); | |
390 | if (cs_l) { | |
391 | printk(KERN_DEBUG "set_cr0: #GP, start paging " | |
392 | "in long mode while CS.L == 1\n"); | |
393 | inject_gp(vcpu); | |
394 | return; | |
395 | ||
396 | } | |
397 | } else | |
398 | #endif | |
1342d353 | 399 | if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) { |
6aa8b732 AK |
400 | printk(KERN_DEBUG "set_cr0: #GP, pdptrs " |
401 | "reserved bits\n"); | |
402 | inject_gp(vcpu); | |
403 | return; | |
404 | } | |
405 | ||
406 | } | |
407 | ||
408 | kvm_arch_ops->set_cr0(vcpu, cr0); | |
409 | vcpu->cr0 = cr0; | |
410 | ||
411 | spin_lock(&vcpu->kvm->lock); | |
412 | kvm_mmu_reset_context(vcpu); | |
413 | spin_unlock(&vcpu->kvm->lock); | |
414 | return; | |
415 | } | |
416 | EXPORT_SYMBOL_GPL(set_cr0); | |
417 | ||
418 | void lmsw(struct kvm_vcpu *vcpu, unsigned long msw) | |
419 | { | |
399badf3 | 420 | kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu); |
6aa8b732 AK |
421 | set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f)); |
422 | } | |
423 | EXPORT_SYMBOL_GPL(lmsw); | |
424 | ||
425 | void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) | |
426 | { | |
427 | if (cr4 & CR4_RESEVED_BITS) { | |
428 | printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n"); | |
429 | inject_gp(vcpu); | |
430 | return; | |
431 | } | |
432 | ||
a9058ecd | 433 | if (is_long_mode(vcpu)) { |
6aa8b732 AK |
434 | if (!(cr4 & CR4_PAE_MASK)) { |
435 | printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while " | |
436 | "in long mode\n"); | |
437 | inject_gp(vcpu); | |
438 | return; | |
439 | } | |
440 | } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK) | |
1342d353 | 441 | && !load_pdptrs(vcpu, vcpu->cr3)) { |
6aa8b732 AK |
442 | printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n"); |
443 | inject_gp(vcpu); | |
444 | } | |
445 | ||
446 | if (cr4 & CR4_VMXE_MASK) { | |
447 | printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n"); | |
448 | inject_gp(vcpu); | |
449 | return; | |
450 | } | |
451 | kvm_arch_ops->set_cr4(vcpu, cr4); | |
452 | spin_lock(&vcpu->kvm->lock); | |
453 | kvm_mmu_reset_context(vcpu); | |
454 | spin_unlock(&vcpu->kvm->lock); | |
455 | } | |
456 | EXPORT_SYMBOL_GPL(set_cr4); | |
457 | ||
458 | void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) | |
459 | { | |
a9058ecd | 460 | if (is_long_mode(vcpu)) { |
d27d4aca | 461 | if (cr3 & CR3_L_MODE_RESEVED_BITS) { |
6aa8b732 AK |
462 | printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n"); |
463 | inject_gp(vcpu); | |
464 | return; | |
465 | } | |
466 | } else { | |
467 | if (cr3 & CR3_RESEVED_BITS) { | |
468 | printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n"); | |
469 | inject_gp(vcpu); | |
470 | return; | |
471 | } | |
472 | if (is_paging(vcpu) && is_pae(vcpu) && | |
1342d353 | 473 | !load_pdptrs(vcpu, cr3)) { |
6aa8b732 AK |
474 | printk(KERN_DEBUG "set_cr3: #GP, pdptrs " |
475 | "reserved bits\n"); | |
476 | inject_gp(vcpu); | |
477 | return; | |
478 | } | |
479 | } | |
480 | ||
481 | vcpu->cr3 = cr3; | |
482 | spin_lock(&vcpu->kvm->lock); | |
d21225ee IM |
483 | /* |
484 | * Does the new cr3 value map to physical memory? (Note, we | |
485 | * catch an invalid cr3 even in real-mode, because it would | |
486 | * cause trouble later on when we turn on paging anyway.) | |
487 | * | |
488 | * A real CPU would silently accept an invalid cr3 and would | |
489 | * attempt to use it - with largely undefined (and often hard | |
490 | * to debug) behavior on the guest side. | |
491 | */ | |
492 | if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT))) | |
493 | inject_gp(vcpu); | |
494 | else | |
495 | vcpu->mmu.new_cr3(vcpu); | |
6aa8b732 AK |
496 | spin_unlock(&vcpu->kvm->lock); |
497 | } | |
498 | EXPORT_SYMBOL_GPL(set_cr3); | |
499 | ||
500 | void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8) | |
501 | { | |
502 | if ( cr8 & CR8_RESEVED_BITS) { | |
503 | printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8); | |
504 | inject_gp(vcpu); | |
505 | return; | |
506 | } | |
507 | vcpu->cr8 = cr8; | |
508 | } | |
509 | EXPORT_SYMBOL_GPL(set_cr8); | |
510 | ||
511 | void fx_init(struct kvm_vcpu *vcpu) | |
512 | { | |
513 | struct __attribute__ ((__packed__)) fx_image_s { | |
514 | u16 control; //fcw | |
515 | u16 status; //fsw | |
516 | u16 tag; // ftw | |
517 | u16 opcode; //fop | |
518 | u64 ip; // fpu ip | |
519 | u64 operand;// fpu dp | |
520 | u32 mxcsr; | |
521 | u32 mxcsr_mask; | |
522 | ||
523 | } *fx_image; | |
524 | ||
525 | fx_save(vcpu->host_fx_image); | |
526 | fpu_init(); | |
527 | fx_save(vcpu->guest_fx_image); | |
528 | fx_restore(vcpu->host_fx_image); | |
529 | ||
530 | fx_image = (struct fx_image_s *)vcpu->guest_fx_image; | |
531 | fx_image->mxcsr = 0x1f80; | |
532 | memset(vcpu->guest_fx_image + sizeof(struct fx_image_s), | |
533 | 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s)); | |
534 | } | |
535 | EXPORT_SYMBOL_GPL(fx_init); | |
536 | ||
537 | /* | |
538 | * Creates some virtual cpus. Good luck creating more than one. | |
539 | */ | |
540 | static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n) | |
541 | { | |
542 | int r; | |
543 | struct kvm_vcpu *vcpu; | |
544 | ||
545 | r = -EINVAL; | |
5aacf0ca | 546 | if (!valid_vcpu(n)) |
6aa8b732 AK |
547 | goto out; |
548 | ||
549 | vcpu = &kvm->vcpus[n]; | |
550 | ||
551 | mutex_lock(&vcpu->mutex); | |
552 | ||
553 | if (vcpu->vmcs) { | |
554 | mutex_unlock(&vcpu->mutex); | |
555 | return -EEXIST; | |
556 | } | |
557 | ||
558 | vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf, | |
559 | FX_IMAGE_ALIGN); | |
560 | vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE; | |
561 | ||
6aa8b732 AK |
562 | r = kvm_arch_ops->vcpu_create(vcpu); |
563 | if (r < 0) | |
564 | goto out_free_vcpus; | |
565 | ||
8018c27b IM |
566 | r = kvm_mmu_create(vcpu); |
567 | if (r < 0) | |
568 | goto out_free_vcpus; | |
6aa8b732 | 569 | |
8018c27b IM |
570 | kvm_arch_ops->vcpu_load(vcpu); |
571 | r = kvm_mmu_setup(vcpu); | |
6aa8b732 | 572 | if (r >= 0) |
8018c27b | 573 | r = kvm_arch_ops->vcpu_setup(vcpu); |
6aa8b732 AK |
574 | vcpu_put(vcpu); |
575 | ||
576 | if (r < 0) | |
577 | goto out_free_vcpus; | |
578 | ||
579 | return 0; | |
580 | ||
581 | out_free_vcpus: | |
582 | kvm_free_vcpu(vcpu); | |
583 | mutex_unlock(&vcpu->mutex); | |
584 | out: | |
585 | return r; | |
586 | } | |
587 | ||
588 | /* | |
589 | * Allocate some memory and give it an address in the guest physical address | |
590 | * space. | |
591 | * | |
592 | * Discontiguous memory is allowed, mostly for framebuffers. | |
593 | */ | |
594 | static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm, | |
595 | struct kvm_memory_region *mem) | |
596 | { | |
597 | int r; | |
598 | gfn_t base_gfn; | |
599 | unsigned long npages; | |
600 | unsigned long i; | |
601 | struct kvm_memory_slot *memslot; | |
602 | struct kvm_memory_slot old, new; | |
603 | int memory_config_version; | |
604 | ||
605 | r = -EINVAL; | |
606 | /* General sanity checks */ | |
607 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
608 | goto out; | |
609 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
610 | goto out; | |
611 | if (mem->slot >= KVM_MEMORY_SLOTS) | |
612 | goto out; | |
613 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
614 | goto out; | |
615 | ||
616 | memslot = &kvm->memslots[mem->slot]; | |
617 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; | |
618 | npages = mem->memory_size >> PAGE_SHIFT; | |
619 | ||
620 | if (!npages) | |
621 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
622 | ||
623 | raced: | |
624 | spin_lock(&kvm->lock); | |
625 | ||
626 | memory_config_version = kvm->memory_config_version; | |
627 | new = old = *memslot; | |
628 | ||
629 | new.base_gfn = base_gfn; | |
630 | new.npages = npages; | |
631 | new.flags = mem->flags; | |
632 | ||
633 | /* Disallow changing a memory slot's size. */ | |
634 | r = -EINVAL; | |
635 | if (npages && old.npages && npages != old.npages) | |
636 | goto out_unlock; | |
637 | ||
638 | /* Check for overlaps */ | |
639 | r = -EEXIST; | |
640 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
641 | struct kvm_memory_slot *s = &kvm->memslots[i]; | |
642 | ||
643 | if (s == memslot) | |
644 | continue; | |
645 | if (!((base_gfn + npages <= s->base_gfn) || | |
646 | (base_gfn >= s->base_gfn + s->npages))) | |
647 | goto out_unlock; | |
648 | } | |
649 | /* | |
650 | * Do memory allocations outside lock. memory_config_version will | |
651 | * detect any races. | |
652 | */ | |
653 | spin_unlock(&kvm->lock); | |
654 | ||
655 | /* Deallocate if slot is being removed */ | |
656 | if (!npages) | |
8b6d44c7 | 657 | new.phys_mem = NULL; |
6aa8b732 AK |
658 | |
659 | /* Free page dirty bitmap if unneeded */ | |
660 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 661 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
662 | |
663 | r = -ENOMEM; | |
664 | ||
665 | /* Allocate if a slot is being created */ | |
666 | if (npages && !new.phys_mem) { | |
667 | new.phys_mem = vmalloc(npages * sizeof(struct page *)); | |
668 | ||
669 | if (!new.phys_mem) | |
670 | goto out_free; | |
671 | ||
672 | memset(new.phys_mem, 0, npages * sizeof(struct page *)); | |
673 | for (i = 0; i < npages; ++i) { | |
674 | new.phys_mem[i] = alloc_page(GFP_HIGHUSER | |
675 | | __GFP_ZERO); | |
676 | if (!new.phys_mem[i]) | |
677 | goto out_free; | |
5972e953 | 678 | set_page_private(new.phys_mem[i],0); |
6aa8b732 AK |
679 | } |
680 | } | |
681 | ||
682 | /* Allocate page dirty bitmap if needed */ | |
683 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
684 | unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8; | |
685 | ||
686 | new.dirty_bitmap = vmalloc(dirty_bytes); | |
687 | if (!new.dirty_bitmap) | |
688 | goto out_free; | |
689 | memset(new.dirty_bitmap, 0, dirty_bytes); | |
690 | } | |
691 | ||
692 | spin_lock(&kvm->lock); | |
693 | ||
694 | if (memory_config_version != kvm->memory_config_version) { | |
695 | spin_unlock(&kvm->lock); | |
696 | kvm_free_physmem_slot(&new, &old); | |
697 | goto raced; | |
698 | } | |
699 | ||
700 | r = -EAGAIN; | |
701 | if (kvm->busy) | |
702 | goto out_unlock; | |
703 | ||
704 | if (mem->slot >= kvm->nmemslots) | |
705 | kvm->nmemslots = mem->slot + 1; | |
706 | ||
707 | *memslot = new; | |
708 | ++kvm->memory_config_version; | |
709 | ||
710 | spin_unlock(&kvm->lock); | |
711 | ||
712 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { | |
713 | struct kvm_vcpu *vcpu; | |
714 | ||
715 | vcpu = vcpu_load(kvm, i); | |
716 | if (!vcpu) | |
717 | continue; | |
718 | kvm_mmu_reset_context(vcpu); | |
719 | vcpu_put(vcpu); | |
720 | } | |
721 | ||
722 | kvm_free_physmem_slot(&old, &new); | |
723 | return 0; | |
724 | ||
725 | out_unlock: | |
726 | spin_unlock(&kvm->lock); | |
727 | out_free: | |
728 | kvm_free_physmem_slot(&new, &old); | |
729 | out: | |
730 | return r; | |
731 | } | |
732 | ||
714b93da AK |
733 | static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot) |
734 | { | |
735 | spin_lock(&vcpu->kvm->lock); | |
736 | kvm_mmu_slot_remove_write_access(vcpu, slot); | |
737 | spin_unlock(&vcpu->kvm->lock); | |
738 | } | |
739 | ||
6aa8b732 AK |
740 | /* |
741 | * Get (and clear) the dirty memory log for a memory slot. | |
742 | */ | |
743 | static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm, | |
744 | struct kvm_dirty_log *log) | |
745 | { | |
746 | struct kvm_memory_slot *memslot; | |
747 | int r, i; | |
748 | int n; | |
714b93da | 749 | int cleared; |
6aa8b732 AK |
750 | unsigned long any = 0; |
751 | ||
752 | spin_lock(&kvm->lock); | |
753 | ||
754 | /* | |
755 | * Prevent changes to guest memory configuration even while the lock | |
756 | * is not taken. | |
757 | */ | |
758 | ++kvm->busy; | |
759 | spin_unlock(&kvm->lock); | |
760 | r = -EINVAL; | |
761 | if (log->slot >= KVM_MEMORY_SLOTS) | |
762 | goto out; | |
763 | ||
764 | memslot = &kvm->memslots[log->slot]; | |
765 | r = -ENOENT; | |
766 | if (!memslot->dirty_bitmap) | |
767 | goto out; | |
768 | ||
769 | n = ALIGN(memslot->npages, 8) / 8; | |
770 | ||
771 | for (i = 0; !any && i < n; ++i) | |
772 | any = memslot->dirty_bitmap[i]; | |
773 | ||
774 | r = -EFAULT; | |
775 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
776 | goto out; | |
777 | ||
6aa8b732 | 778 | if (any) { |
714b93da | 779 | cleared = 0; |
6aa8b732 AK |
780 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { |
781 | struct kvm_vcpu *vcpu = vcpu_load(kvm, i); | |
782 | ||
783 | if (!vcpu) | |
784 | continue; | |
714b93da AK |
785 | if (!cleared) { |
786 | do_remove_write_access(vcpu, log->slot); | |
787 | memset(memslot->dirty_bitmap, 0, n); | |
788 | cleared = 1; | |
789 | } | |
6aa8b732 AK |
790 | kvm_arch_ops->tlb_flush(vcpu); |
791 | vcpu_put(vcpu); | |
792 | } | |
793 | } | |
794 | ||
795 | r = 0; | |
796 | ||
797 | out: | |
798 | spin_lock(&kvm->lock); | |
799 | --kvm->busy; | |
800 | spin_unlock(&kvm->lock); | |
801 | return r; | |
802 | } | |
803 | ||
804 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) | |
805 | { | |
806 | int i; | |
807 | ||
808 | for (i = 0; i < kvm->nmemslots; ++i) { | |
809 | struct kvm_memory_slot *memslot = &kvm->memslots[i]; | |
810 | ||
811 | if (gfn >= memslot->base_gfn | |
812 | && gfn < memslot->base_gfn + memslot->npages) | |
813 | return memslot; | |
814 | } | |
8b6d44c7 | 815 | return NULL; |
6aa8b732 AK |
816 | } |
817 | EXPORT_SYMBOL_GPL(gfn_to_memslot); | |
818 | ||
819 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) | |
820 | { | |
821 | int i; | |
8b6d44c7 | 822 | struct kvm_memory_slot *memslot = NULL; |
6aa8b732 AK |
823 | unsigned long rel_gfn; |
824 | ||
825 | for (i = 0; i < kvm->nmemslots; ++i) { | |
826 | memslot = &kvm->memslots[i]; | |
827 | ||
828 | if (gfn >= memslot->base_gfn | |
829 | && gfn < memslot->base_gfn + memslot->npages) { | |
830 | ||
831 | if (!memslot || !memslot->dirty_bitmap) | |
832 | return; | |
833 | ||
834 | rel_gfn = gfn - memslot->base_gfn; | |
835 | ||
836 | /* avoid RMW */ | |
837 | if (!test_bit(rel_gfn, memslot->dirty_bitmap)) | |
838 | set_bit(rel_gfn, memslot->dirty_bitmap); | |
839 | return; | |
840 | } | |
841 | } | |
842 | } | |
843 | ||
844 | static int emulator_read_std(unsigned long addr, | |
845 | unsigned long *val, | |
846 | unsigned int bytes, | |
847 | struct x86_emulate_ctxt *ctxt) | |
848 | { | |
849 | struct kvm_vcpu *vcpu = ctxt->vcpu; | |
850 | void *data = val; | |
851 | ||
852 | while (bytes) { | |
853 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr); | |
854 | unsigned offset = addr & (PAGE_SIZE-1); | |
855 | unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset); | |
856 | unsigned long pfn; | |
857 | struct kvm_memory_slot *memslot; | |
858 | void *page; | |
859 | ||
860 | if (gpa == UNMAPPED_GVA) | |
861 | return X86EMUL_PROPAGATE_FAULT; | |
862 | pfn = gpa >> PAGE_SHIFT; | |
863 | memslot = gfn_to_memslot(vcpu->kvm, pfn); | |
864 | if (!memslot) | |
865 | return X86EMUL_UNHANDLEABLE; | |
866 | page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0); | |
867 | ||
868 | memcpy(data, page + offset, tocopy); | |
869 | ||
870 | kunmap_atomic(page, KM_USER0); | |
871 | ||
872 | bytes -= tocopy; | |
873 | data += tocopy; | |
874 | addr += tocopy; | |
875 | } | |
876 | ||
877 | return X86EMUL_CONTINUE; | |
878 | } | |
879 | ||
880 | static int emulator_write_std(unsigned long addr, | |
881 | unsigned long val, | |
882 | unsigned int bytes, | |
883 | struct x86_emulate_ctxt *ctxt) | |
884 | { | |
885 | printk(KERN_ERR "emulator_write_std: addr %lx n %d\n", | |
886 | addr, bytes); | |
887 | return X86EMUL_UNHANDLEABLE; | |
888 | } | |
889 | ||
890 | static int emulator_read_emulated(unsigned long addr, | |
891 | unsigned long *val, | |
892 | unsigned int bytes, | |
893 | struct x86_emulate_ctxt *ctxt) | |
894 | { | |
895 | struct kvm_vcpu *vcpu = ctxt->vcpu; | |
896 | ||
897 | if (vcpu->mmio_read_completed) { | |
898 | memcpy(val, vcpu->mmio_data, bytes); | |
899 | vcpu->mmio_read_completed = 0; | |
900 | return X86EMUL_CONTINUE; | |
901 | } else if (emulator_read_std(addr, val, bytes, ctxt) | |
902 | == X86EMUL_CONTINUE) | |
903 | return X86EMUL_CONTINUE; | |
904 | else { | |
905 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr); | |
d27d4aca | 906 | |
6aa8b732 | 907 | if (gpa == UNMAPPED_GVA) |
d27d4aca | 908 | return X86EMUL_PROPAGATE_FAULT; |
6aa8b732 AK |
909 | vcpu->mmio_needed = 1; |
910 | vcpu->mmio_phys_addr = gpa; | |
911 | vcpu->mmio_size = bytes; | |
912 | vcpu->mmio_is_write = 0; | |
913 | ||
914 | return X86EMUL_UNHANDLEABLE; | |
915 | } | |
916 | } | |
917 | ||
da4a00f0 AK |
918 | static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, |
919 | unsigned long val, int bytes) | |
920 | { | |
921 | struct kvm_memory_slot *m; | |
922 | struct page *page; | |
923 | void *virt; | |
924 | ||
925 | if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT)) | |
926 | return 0; | |
927 | m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT); | |
928 | if (!m) | |
929 | return 0; | |
930 | page = gfn_to_page(m, gpa >> PAGE_SHIFT); | |
931 | kvm_mmu_pre_write(vcpu, gpa, bytes); | |
932 | virt = kmap_atomic(page, KM_USER0); | |
933 | memcpy(virt + offset_in_page(gpa), &val, bytes); | |
934 | kunmap_atomic(virt, KM_USER0); | |
935 | kvm_mmu_post_write(vcpu, gpa, bytes); | |
936 | return 1; | |
937 | } | |
938 | ||
6aa8b732 AK |
939 | static int emulator_write_emulated(unsigned long addr, |
940 | unsigned long val, | |
941 | unsigned int bytes, | |
942 | struct x86_emulate_ctxt *ctxt) | |
943 | { | |
944 | struct kvm_vcpu *vcpu = ctxt->vcpu; | |
945 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr); | |
946 | ||
947 | if (gpa == UNMAPPED_GVA) | |
948 | return X86EMUL_PROPAGATE_FAULT; | |
949 | ||
da4a00f0 AK |
950 | if (emulator_write_phys(vcpu, gpa, val, bytes)) |
951 | return X86EMUL_CONTINUE; | |
952 | ||
6aa8b732 AK |
953 | vcpu->mmio_needed = 1; |
954 | vcpu->mmio_phys_addr = gpa; | |
955 | vcpu->mmio_size = bytes; | |
956 | vcpu->mmio_is_write = 1; | |
957 | memcpy(vcpu->mmio_data, &val, bytes); | |
958 | ||
959 | return X86EMUL_CONTINUE; | |
960 | } | |
961 | ||
962 | static int emulator_cmpxchg_emulated(unsigned long addr, | |
963 | unsigned long old, | |
964 | unsigned long new, | |
965 | unsigned int bytes, | |
966 | struct x86_emulate_ctxt *ctxt) | |
967 | { | |
968 | static int reported; | |
969 | ||
970 | if (!reported) { | |
971 | reported = 1; | |
972 | printk(KERN_WARNING "kvm: emulating exchange as write\n"); | |
973 | } | |
974 | return emulator_write_emulated(addr, new, bytes, ctxt); | |
975 | } | |
976 | ||
32b35627 AK |
977 | #ifdef CONFIG_X86_32 |
978 | ||
979 | static int emulator_cmpxchg8b_emulated(unsigned long addr, | |
980 | unsigned long old_lo, | |
981 | unsigned long old_hi, | |
982 | unsigned long new_lo, | |
983 | unsigned long new_hi, | |
984 | struct x86_emulate_ctxt *ctxt) | |
985 | { | |
986 | static int reported; | |
987 | int r; | |
988 | ||
989 | if (!reported) { | |
990 | reported = 1; | |
991 | printk(KERN_WARNING "kvm: emulating exchange8b as write\n"); | |
992 | } | |
993 | r = emulator_write_emulated(addr, new_lo, 4, ctxt); | |
994 | if (r != X86EMUL_CONTINUE) | |
995 | return r; | |
996 | return emulator_write_emulated(addr+4, new_hi, 4, ctxt); | |
997 | } | |
998 | ||
999 | #endif | |
1000 | ||
6aa8b732 AK |
1001 | static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg) |
1002 | { | |
1003 | return kvm_arch_ops->get_segment_base(vcpu, seg); | |
1004 | } | |
1005 | ||
1006 | int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address) | |
1007 | { | |
6aa8b732 AK |
1008 | return X86EMUL_CONTINUE; |
1009 | } | |
1010 | ||
1011 | int emulate_clts(struct kvm_vcpu *vcpu) | |
1012 | { | |
399badf3 | 1013 | unsigned long cr0; |
6aa8b732 | 1014 | |
399badf3 AK |
1015 | kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu); |
1016 | cr0 = vcpu->cr0 & ~CR0_TS_MASK; | |
6aa8b732 AK |
1017 | kvm_arch_ops->set_cr0(vcpu, cr0); |
1018 | return X86EMUL_CONTINUE; | |
1019 | } | |
1020 | ||
1021 | int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest) | |
1022 | { | |
1023 | struct kvm_vcpu *vcpu = ctxt->vcpu; | |
1024 | ||
1025 | switch (dr) { | |
1026 | case 0 ... 3: | |
1027 | *dest = kvm_arch_ops->get_dr(vcpu, dr); | |
1028 | return X86EMUL_CONTINUE; | |
1029 | default: | |
1030 | printk(KERN_DEBUG "%s: unexpected dr %u\n", | |
1031 | __FUNCTION__, dr); | |
1032 | return X86EMUL_UNHANDLEABLE; | |
1033 | } | |
1034 | } | |
1035 | ||
1036 | int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value) | |
1037 | { | |
1038 | unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U; | |
1039 | int exception; | |
1040 | ||
1041 | kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception); | |
1042 | if (exception) { | |
1043 | /* FIXME: better handling */ | |
1044 | return X86EMUL_UNHANDLEABLE; | |
1045 | } | |
1046 | return X86EMUL_CONTINUE; | |
1047 | } | |
1048 | ||
1049 | static void report_emulation_failure(struct x86_emulate_ctxt *ctxt) | |
1050 | { | |
1051 | static int reported; | |
1052 | u8 opcodes[4]; | |
1053 | unsigned long rip = ctxt->vcpu->rip; | |
1054 | unsigned long rip_linear; | |
1055 | ||
1056 | rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS); | |
1057 | ||
1058 | if (reported) | |
1059 | return; | |
1060 | ||
1061 | emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt); | |
1062 | ||
1063 | printk(KERN_ERR "emulation failed but !mmio_needed?" | |
1064 | " rip %lx %02x %02x %02x %02x\n", | |
1065 | rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]); | |
1066 | reported = 1; | |
1067 | } | |
1068 | ||
1069 | struct x86_emulate_ops emulate_ops = { | |
1070 | .read_std = emulator_read_std, | |
1071 | .write_std = emulator_write_std, | |
1072 | .read_emulated = emulator_read_emulated, | |
1073 | .write_emulated = emulator_write_emulated, | |
1074 | .cmpxchg_emulated = emulator_cmpxchg_emulated, | |
32b35627 AK |
1075 | #ifdef CONFIG_X86_32 |
1076 | .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated, | |
1077 | #endif | |
6aa8b732 AK |
1078 | }; |
1079 | ||
1080 | int emulate_instruction(struct kvm_vcpu *vcpu, | |
1081 | struct kvm_run *run, | |
1082 | unsigned long cr2, | |
1083 | u16 error_code) | |
1084 | { | |
1085 | struct x86_emulate_ctxt emulate_ctxt; | |
1086 | int r; | |
1087 | int cs_db, cs_l; | |
1088 | ||
1089 | kvm_arch_ops->cache_regs(vcpu); | |
1090 | ||
1091 | kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); | |
1092 | ||
1093 | emulate_ctxt.vcpu = vcpu; | |
1094 | emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu); | |
1095 | emulate_ctxt.cr2 = cr2; | |
1096 | emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM) | |
1097 | ? X86EMUL_MODE_REAL : cs_l | |
1098 | ? X86EMUL_MODE_PROT64 : cs_db | |
1099 | ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16; | |
1100 | ||
1101 | if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) { | |
1102 | emulate_ctxt.cs_base = 0; | |
1103 | emulate_ctxt.ds_base = 0; | |
1104 | emulate_ctxt.es_base = 0; | |
1105 | emulate_ctxt.ss_base = 0; | |
1106 | } else { | |
1107 | emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS); | |
1108 | emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS); | |
1109 | emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES); | |
1110 | emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS); | |
1111 | } | |
1112 | ||
1113 | emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS); | |
1114 | emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS); | |
1115 | ||
1116 | vcpu->mmio_is_write = 0; | |
1117 | r = x86_emulate_memop(&emulate_ctxt, &emulate_ops); | |
1118 | ||
1119 | if ((r || vcpu->mmio_is_write) && run) { | |
1120 | run->mmio.phys_addr = vcpu->mmio_phys_addr; | |
1121 | memcpy(run->mmio.data, vcpu->mmio_data, 8); | |
1122 | run->mmio.len = vcpu->mmio_size; | |
1123 | run->mmio.is_write = vcpu->mmio_is_write; | |
1124 | } | |
1125 | ||
1126 | if (r) { | |
a436036b AK |
1127 | if (kvm_mmu_unprotect_page_virt(vcpu, cr2)) |
1128 | return EMULATE_DONE; | |
6aa8b732 AK |
1129 | if (!vcpu->mmio_needed) { |
1130 | report_emulation_failure(&emulate_ctxt); | |
1131 | return EMULATE_FAIL; | |
1132 | } | |
1133 | return EMULATE_DO_MMIO; | |
1134 | } | |
1135 | ||
1136 | kvm_arch_ops->decache_regs(vcpu); | |
1137 | kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags); | |
1138 | ||
1139 | if (vcpu->mmio_is_write) | |
1140 | return EMULATE_DO_MMIO; | |
1141 | ||
1142 | return EMULATE_DONE; | |
1143 | } | |
1144 | EXPORT_SYMBOL_GPL(emulate_instruction); | |
1145 | ||
270fd9b9 AK |
1146 | int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run) |
1147 | { | |
1148 | unsigned long nr, a0, a1, a2, a3, a4, a5, ret; | |
1149 | ||
1150 | kvm_arch_ops->decache_regs(vcpu); | |
1151 | ret = -KVM_EINVAL; | |
1152 | #ifdef CONFIG_X86_64 | |
1153 | if (is_long_mode(vcpu)) { | |
1154 | nr = vcpu->regs[VCPU_REGS_RAX]; | |
1155 | a0 = vcpu->regs[VCPU_REGS_RDI]; | |
1156 | a1 = vcpu->regs[VCPU_REGS_RSI]; | |
1157 | a2 = vcpu->regs[VCPU_REGS_RDX]; | |
1158 | a3 = vcpu->regs[VCPU_REGS_RCX]; | |
1159 | a4 = vcpu->regs[VCPU_REGS_R8]; | |
1160 | a5 = vcpu->regs[VCPU_REGS_R9]; | |
1161 | } else | |
1162 | #endif | |
1163 | { | |
1164 | nr = vcpu->regs[VCPU_REGS_RBX] & -1u; | |
1165 | a0 = vcpu->regs[VCPU_REGS_RAX] & -1u; | |
1166 | a1 = vcpu->regs[VCPU_REGS_RCX] & -1u; | |
1167 | a2 = vcpu->regs[VCPU_REGS_RDX] & -1u; | |
1168 | a3 = vcpu->regs[VCPU_REGS_RSI] & -1u; | |
1169 | a4 = vcpu->regs[VCPU_REGS_RDI] & -1u; | |
1170 | a5 = vcpu->regs[VCPU_REGS_RBP] & -1u; | |
1171 | } | |
1172 | switch (nr) { | |
1173 | default: | |
1174 | ; | |
1175 | } | |
1176 | vcpu->regs[VCPU_REGS_RAX] = ret; | |
1177 | kvm_arch_ops->cache_regs(vcpu); | |
1178 | return 1; | |
1179 | } | |
1180 | EXPORT_SYMBOL_GPL(kvm_hypercall); | |
1181 | ||
6aa8b732 AK |
1182 | static u64 mk_cr_64(u64 curr_cr, u32 new_val) |
1183 | { | |
1184 | return (curr_cr & ~((1ULL << 32) - 1)) | new_val; | |
1185 | } | |
1186 | ||
1187 | void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) | |
1188 | { | |
1189 | struct descriptor_table dt = { limit, base }; | |
1190 | ||
1191 | kvm_arch_ops->set_gdt(vcpu, &dt); | |
1192 | } | |
1193 | ||
1194 | void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) | |
1195 | { | |
1196 | struct descriptor_table dt = { limit, base }; | |
1197 | ||
1198 | kvm_arch_ops->set_idt(vcpu, &dt); | |
1199 | } | |
1200 | ||
1201 | void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw, | |
1202 | unsigned long *rflags) | |
1203 | { | |
1204 | lmsw(vcpu, msw); | |
1205 | *rflags = kvm_arch_ops->get_rflags(vcpu); | |
1206 | } | |
1207 | ||
1208 | unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr) | |
1209 | { | |
399badf3 | 1210 | kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu); |
6aa8b732 AK |
1211 | switch (cr) { |
1212 | case 0: | |
1213 | return vcpu->cr0; | |
1214 | case 2: | |
1215 | return vcpu->cr2; | |
1216 | case 3: | |
1217 | return vcpu->cr3; | |
1218 | case 4: | |
1219 | return vcpu->cr4; | |
1220 | default: | |
1221 | vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); | |
1222 | return 0; | |
1223 | } | |
1224 | } | |
1225 | ||
1226 | void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val, | |
1227 | unsigned long *rflags) | |
1228 | { | |
1229 | switch (cr) { | |
1230 | case 0: | |
1231 | set_cr0(vcpu, mk_cr_64(vcpu->cr0, val)); | |
1232 | *rflags = kvm_arch_ops->get_rflags(vcpu); | |
1233 | break; | |
1234 | case 2: | |
1235 | vcpu->cr2 = val; | |
1236 | break; | |
1237 | case 3: | |
1238 | set_cr3(vcpu, val); | |
1239 | break; | |
1240 | case 4: | |
1241 | set_cr4(vcpu, mk_cr_64(vcpu->cr4, val)); | |
1242 | break; | |
1243 | default: | |
1244 | vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); | |
1245 | } | |
1246 | } | |
1247 | ||
102d8325 IM |
1248 | /* |
1249 | * Register the para guest with the host: | |
1250 | */ | |
1251 | static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa) | |
1252 | { | |
1253 | struct kvm_vcpu_para_state *para_state; | |
1254 | hpa_t para_state_hpa, hypercall_hpa; | |
1255 | struct page *para_state_page; | |
1256 | unsigned char *hypercall; | |
1257 | gpa_t hypercall_gpa; | |
1258 | ||
1259 | printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n"); | |
1260 | printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa); | |
1261 | ||
1262 | /* | |
1263 | * Needs to be page aligned: | |
1264 | */ | |
1265 | if (para_state_gpa != PAGE_ALIGN(para_state_gpa)) | |
1266 | goto err_gp; | |
1267 | ||
1268 | para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa); | |
1269 | printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa); | |
1270 | if (is_error_hpa(para_state_hpa)) | |
1271 | goto err_gp; | |
1272 | ||
1273 | para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT); | |
1274 | para_state = kmap_atomic(para_state_page, KM_USER0); | |
1275 | ||
1276 | printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version); | |
1277 | printk(KERN_DEBUG ".... size: %d\n", para_state->size); | |
1278 | ||
1279 | para_state->host_version = KVM_PARA_API_VERSION; | |
1280 | /* | |
1281 | * We cannot support guests that try to register themselves | |
1282 | * with a newer API version than the host supports: | |
1283 | */ | |
1284 | if (para_state->guest_version > KVM_PARA_API_VERSION) { | |
1285 | para_state->ret = -KVM_EINVAL; | |
1286 | goto err_kunmap_skip; | |
1287 | } | |
1288 | ||
1289 | hypercall_gpa = para_state->hypercall_gpa; | |
1290 | hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa); | |
1291 | printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa); | |
1292 | if (is_error_hpa(hypercall_hpa)) { | |
1293 | para_state->ret = -KVM_EINVAL; | |
1294 | goto err_kunmap_skip; | |
1295 | } | |
1296 | ||
1297 | printk(KERN_DEBUG "kvm: para guest successfully registered.\n"); | |
1298 | vcpu->para_state_page = para_state_page; | |
1299 | vcpu->para_state_gpa = para_state_gpa; | |
1300 | vcpu->hypercall_gpa = hypercall_gpa; | |
1301 | ||
1302 | hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT), | |
1303 | KM_USER1) + (hypercall_hpa & ~PAGE_MASK); | |
1304 | kvm_arch_ops->patch_hypercall(vcpu, hypercall); | |
1305 | kunmap_atomic(hypercall, KM_USER1); | |
1306 | ||
1307 | para_state->ret = 0; | |
1308 | err_kunmap_skip: | |
1309 | kunmap_atomic(para_state, KM_USER0); | |
1310 | return 0; | |
1311 | err_gp: | |
1312 | return 1; | |
1313 | } | |
1314 | ||
3bab1f5d AK |
1315 | int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) |
1316 | { | |
1317 | u64 data; | |
1318 | ||
1319 | switch (msr) { | |
1320 | case 0xc0010010: /* SYSCFG */ | |
1321 | case 0xc0010015: /* HWCR */ | |
1322 | case MSR_IA32_PLATFORM_ID: | |
1323 | case MSR_IA32_P5_MC_ADDR: | |
1324 | case MSR_IA32_P5_MC_TYPE: | |
1325 | case MSR_IA32_MC0_CTL: | |
1326 | case MSR_IA32_MCG_STATUS: | |
1327 | case MSR_IA32_MCG_CAP: | |
1328 | case MSR_IA32_MC0_MISC: | |
1329 | case MSR_IA32_MC0_MISC+4: | |
1330 | case MSR_IA32_MC0_MISC+8: | |
1331 | case MSR_IA32_MC0_MISC+12: | |
1332 | case MSR_IA32_MC0_MISC+16: | |
1333 | case MSR_IA32_UCODE_REV: | |
a8d13ea2 | 1334 | case MSR_IA32_PERF_STATUS: |
3bab1f5d AK |
1335 | /* MTRR registers */ |
1336 | case 0xfe: | |
1337 | case 0x200 ... 0x2ff: | |
1338 | data = 0; | |
1339 | break; | |
a8d13ea2 AK |
1340 | case 0xcd: /* fsb frequency */ |
1341 | data = 3; | |
1342 | break; | |
3bab1f5d AK |
1343 | case MSR_IA32_APICBASE: |
1344 | data = vcpu->apic_base; | |
1345 | break; | |
6f00e68f AK |
1346 | case MSR_IA32_MISC_ENABLE: |
1347 | data = vcpu->ia32_misc_enable_msr; | |
1348 | break; | |
3bab1f5d AK |
1349 | #ifdef CONFIG_X86_64 |
1350 | case MSR_EFER: | |
1351 | data = vcpu->shadow_efer; | |
1352 | break; | |
1353 | #endif | |
1354 | default: | |
1355 | printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr); | |
1356 | return 1; | |
1357 | } | |
1358 | *pdata = data; | |
1359 | return 0; | |
1360 | } | |
1361 | EXPORT_SYMBOL_GPL(kvm_get_msr_common); | |
1362 | ||
6aa8b732 AK |
1363 | /* |
1364 | * Reads an msr value (of 'msr_index') into 'pdata'. | |
1365 | * Returns 0 on success, non-0 otherwise. | |
1366 | * Assumes vcpu_load() was already called. | |
1367 | */ | |
1368 | static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) | |
1369 | { | |
1370 | return kvm_arch_ops->get_msr(vcpu, msr_index, pdata); | |
1371 | } | |
1372 | ||
05b3e0c2 | 1373 | #ifdef CONFIG_X86_64 |
6aa8b732 | 1374 | |
3bab1f5d | 1375 | static void set_efer(struct kvm_vcpu *vcpu, u64 efer) |
6aa8b732 | 1376 | { |
6aa8b732 AK |
1377 | if (efer & EFER_RESERVED_BITS) { |
1378 | printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n", | |
1379 | efer); | |
1380 | inject_gp(vcpu); | |
1381 | return; | |
1382 | } | |
1383 | ||
1384 | if (is_paging(vcpu) | |
1385 | && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) { | |
1386 | printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n"); | |
1387 | inject_gp(vcpu); | |
1388 | return; | |
1389 | } | |
1390 | ||
7725f0ba AK |
1391 | kvm_arch_ops->set_efer(vcpu, efer); |
1392 | ||
6aa8b732 AK |
1393 | efer &= ~EFER_LMA; |
1394 | efer |= vcpu->shadow_efer & EFER_LMA; | |
1395 | ||
1396 | vcpu->shadow_efer = efer; | |
6aa8b732 | 1397 | } |
6aa8b732 AK |
1398 | |
1399 | #endif | |
1400 | ||
3bab1f5d AK |
1401 | int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) |
1402 | { | |
1403 | switch (msr) { | |
1404 | #ifdef CONFIG_X86_64 | |
1405 | case MSR_EFER: | |
1406 | set_efer(vcpu, data); | |
1407 | break; | |
1408 | #endif | |
1409 | case MSR_IA32_MC0_STATUS: | |
1410 | printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n", | |
1411 | __FUNCTION__, data); | |
1412 | break; | |
1413 | case MSR_IA32_UCODE_REV: | |
1414 | case MSR_IA32_UCODE_WRITE: | |
1415 | case 0x200 ... 0x2ff: /* MTRRs */ | |
1416 | break; | |
1417 | case MSR_IA32_APICBASE: | |
1418 | vcpu->apic_base = data; | |
1419 | break; | |
6f00e68f AK |
1420 | case MSR_IA32_MISC_ENABLE: |
1421 | vcpu->ia32_misc_enable_msr = data; | |
1422 | break; | |
102d8325 IM |
1423 | /* |
1424 | * This is the 'probe whether the host is KVM' logic: | |
1425 | */ | |
1426 | case MSR_KVM_API_MAGIC: | |
1427 | return vcpu_register_para(vcpu, data); | |
1428 | ||
3bab1f5d AK |
1429 | default: |
1430 | printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr); | |
1431 | return 1; | |
1432 | } | |
1433 | return 0; | |
1434 | } | |
1435 | EXPORT_SYMBOL_GPL(kvm_set_msr_common); | |
1436 | ||
6aa8b732 AK |
1437 | /* |
1438 | * Writes msr value into into the appropriate "register". | |
1439 | * Returns 0 on success, non-0 otherwise. | |
1440 | * Assumes vcpu_load() was already called. | |
1441 | */ | |
1442 | static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) | |
1443 | { | |
1444 | return kvm_arch_ops->set_msr(vcpu, msr_index, data); | |
1445 | } | |
1446 | ||
1447 | void kvm_resched(struct kvm_vcpu *vcpu) | |
1448 | { | |
1449 | vcpu_put(vcpu); | |
1450 | cond_resched(); | |
1451 | /* Cannot fail - no vcpu unplug yet. */ | |
1452 | vcpu_load(vcpu->kvm, vcpu_slot(vcpu)); | |
1453 | } | |
1454 | EXPORT_SYMBOL_GPL(kvm_resched); | |
1455 | ||
1456 | void load_msrs(struct vmx_msr_entry *e, int n) | |
1457 | { | |
1458 | int i; | |
1459 | ||
1460 | for (i = 0; i < n; ++i) | |
1461 | wrmsrl(e[i].index, e[i].data); | |
1462 | } | |
1463 | EXPORT_SYMBOL_GPL(load_msrs); | |
1464 | ||
1465 | void save_msrs(struct vmx_msr_entry *e, int n) | |
1466 | { | |
1467 | int i; | |
1468 | ||
1469 | for (i = 0; i < n; ++i) | |
1470 | rdmsrl(e[i].index, e[i].data); | |
1471 | } | |
1472 | EXPORT_SYMBOL_GPL(save_msrs); | |
1473 | ||
1474 | static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run) | |
1475 | { | |
1476 | struct kvm_vcpu *vcpu; | |
1477 | int r; | |
1478 | ||
5aacf0ca | 1479 | if (!valid_vcpu(kvm_run->vcpu)) |
6aa8b732 AK |
1480 | return -EINVAL; |
1481 | ||
1482 | vcpu = vcpu_load(kvm, kvm_run->vcpu); | |
1483 | if (!vcpu) | |
1484 | return -ENOENT; | |
1485 | ||
54810342 DL |
1486 | /* re-sync apic's tpr */ |
1487 | vcpu->cr8 = kvm_run->cr8; | |
1488 | ||
6aa8b732 AK |
1489 | if (kvm_run->emulated) { |
1490 | kvm_arch_ops->skip_emulated_instruction(vcpu); | |
1491 | kvm_run->emulated = 0; | |
1492 | } | |
1493 | ||
1494 | if (kvm_run->mmio_completed) { | |
1495 | memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8); | |
1496 | vcpu->mmio_read_completed = 1; | |
1497 | } | |
1498 | ||
1499 | vcpu->mmio_needed = 0; | |
1500 | ||
1501 | r = kvm_arch_ops->run(vcpu, kvm_run); | |
1502 | ||
1503 | vcpu_put(vcpu); | |
1504 | return r; | |
1505 | } | |
1506 | ||
1507 | static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs) | |
1508 | { | |
1509 | struct kvm_vcpu *vcpu; | |
1510 | ||
5aacf0ca | 1511 | if (!valid_vcpu(regs->vcpu)) |
6aa8b732 AK |
1512 | return -EINVAL; |
1513 | ||
1514 | vcpu = vcpu_load(kvm, regs->vcpu); | |
1515 | if (!vcpu) | |
1516 | return -ENOENT; | |
1517 | ||
1518 | kvm_arch_ops->cache_regs(vcpu); | |
1519 | ||
1520 | regs->rax = vcpu->regs[VCPU_REGS_RAX]; | |
1521 | regs->rbx = vcpu->regs[VCPU_REGS_RBX]; | |
1522 | regs->rcx = vcpu->regs[VCPU_REGS_RCX]; | |
1523 | regs->rdx = vcpu->regs[VCPU_REGS_RDX]; | |
1524 | regs->rsi = vcpu->regs[VCPU_REGS_RSI]; | |
1525 | regs->rdi = vcpu->regs[VCPU_REGS_RDI]; | |
1526 | regs->rsp = vcpu->regs[VCPU_REGS_RSP]; | |
1527 | regs->rbp = vcpu->regs[VCPU_REGS_RBP]; | |
05b3e0c2 | 1528 | #ifdef CONFIG_X86_64 |
6aa8b732 AK |
1529 | regs->r8 = vcpu->regs[VCPU_REGS_R8]; |
1530 | regs->r9 = vcpu->regs[VCPU_REGS_R9]; | |
1531 | regs->r10 = vcpu->regs[VCPU_REGS_R10]; | |
1532 | regs->r11 = vcpu->regs[VCPU_REGS_R11]; | |
1533 | regs->r12 = vcpu->regs[VCPU_REGS_R12]; | |
1534 | regs->r13 = vcpu->regs[VCPU_REGS_R13]; | |
1535 | regs->r14 = vcpu->regs[VCPU_REGS_R14]; | |
1536 | regs->r15 = vcpu->regs[VCPU_REGS_R15]; | |
1537 | #endif | |
1538 | ||
1539 | regs->rip = vcpu->rip; | |
1540 | regs->rflags = kvm_arch_ops->get_rflags(vcpu); | |
1541 | ||
1542 | /* | |
1543 | * Don't leak debug flags in case they were set for guest debugging | |
1544 | */ | |
1545 | if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep) | |
1546 | regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF); | |
1547 | ||
1548 | vcpu_put(vcpu); | |
1549 | ||
1550 | return 0; | |
1551 | } | |
1552 | ||
1553 | static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs) | |
1554 | { | |
1555 | struct kvm_vcpu *vcpu; | |
1556 | ||
5aacf0ca | 1557 | if (!valid_vcpu(regs->vcpu)) |
6aa8b732 AK |
1558 | return -EINVAL; |
1559 | ||
1560 | vcpu = vcpu_load(kvm, regs->vcpu); | |
1561 | if (!vcpu) | |
1562 | return -ENOENT; | |
1563 | ||
1564 | vcpu->regs[VCPU_REGS_RAX] = regs->rax; | |
1565 | vcpu->regs[VCPU_REGS_RBX] = regs->rbx; | |
1566 | vcpu->regs[VCPU_REGS_RCX] = regs->rcx; | |
1567 | vcpu->regs[VCPU_REGS_RDX] = regs->rdx; | |
1568 | vcpu->regs[VCPU_REGS_RSI] = regs->rsi; | |
1569 | vcpu->regs[VCPU_REGS_RDI] = regs->rdi; | |
1570 | vcpu->regs[VCPU_REGS_RSP] = regs->rsp; | |
1571 | vcpu->regs[VCPU_REGS_RBP] = regs->rbp; | |
05b3e0c2 | 1572 | #ifdef CONFIG_X86_64 |
6aa8b732 AK |
1573 | vcpu->regs[VCPU_REGS_R8] = regs->r8; |
1574 | vcpu->regs[VCPU_REGS_R9] = regs->r9; | |
1575 | vcpu->regs[VCPU_REGS_R10] = regs->r10; | |
1576 | vcpu->regs[VCPU_REGS_R11] = regs->r11; | |
1577 | vcpu->regs[VCPU_REGS_R12] = regs->r12; | |
1578 | vcpu->regs[VCPU_REGS_R13] = regs->r13; | |
1579 | vcpu->regs[VCPU_REGS_R14] = regs->r14; | |
1580 | vcpu->regs[VCPU_REGS_R15] = regs->r15; | |
1581 | #endif | |
1582 | ||
1583 | vcpu->rip = regs->rip; | |
1584 | kvm_arch_ops->set_rflags(vcpu, regs->rflags); | |
1585 | ||
1586 | kvm_arch_ops->decache_regs(vcpu); | |
1587 | ||
1588 | vcpu_put(vcpu); | |
1589 | ||
1590 | return 0; | |
1591 | } | |
1592 | ||
1593 | static void get_segment(struct kvm_vcpu *vcpu, | |
1594 | struct kvm_segment *var, int seg) | |
1595 | { | |
1596 | return kvm_arch_ops->get_segment(vcpu, var, seg); | |
1597 | } | |
1598 | ||
1599 | static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs) | |
1600 | { | |
1601 | struct kvm_vcpu *vcpu; | |
1602 | struct descriptor_table dt; | |
1603 | ||
5aacf0ca | 1604 | if (!valid_vcpu(sregs->vcpu)) |
6aa8b732 AK |
1605 | return -EINVAL; |
1606 | vcpu = vcpu_load(kvm, sregs->vcpu); | |
1607 | if (!vcpu) | |
1608 | return -ENOENT; | |
1609 | ||
1610 | get_segment(vcpu, &sregs->cs, VCPU_SREG_CS); | |
1611 | get_segment(vcpu, &sregs->ds, VCPU_SREG_DS); | |
1612 | get_segment(vcpu, &sregs->es, VCPU_SREG_ES); | |
1613 | get_segment(vcpu, &sregs->fs, VCPU_SREG_FS); | |
1614 | get_segment(vcpu, &sregs->gs, VCPU_SREG_GS); | |
1615 | get_segment(vcpu, &sregs->ss, VCPU_SREG_SS); | |
1616 | ||
1617 | get_segment(vcpu, &sregs->tr, VCPU_SREG_TR); | |
1618 | get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); | |
1619 | ||
1620 | kvm_arch_ops->get_idt(vcpu, &dt); | |
1621 | sregs->idt.limit = dt.limit; | |
1622 | sregs->idt.base = dt.base; | |
1623 | kvm_arch_ops->get_gdt(vcpu, &dt); | |
1624 | sregs->gdt.limit = dt.limit; | |
1625 | sregs->gdt.base = dt.base; | |
1626 | ||
399badf3 | 1627 | kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu); |
6aa8b732 AK |
1628 | sregs->cr0 = vcpu->cr0; |
1629 | sregs->cr2 = vcpu->cr2; | |
1630 | sregs->cr3 = vcpu->cr3; | |
1631 | sregs->cr4 = vcpu->cr4; | |
1632 | sregs->cr8 = vcpu->cr8; | |
1633 | sregs->efer = vcpu->shadow_efer; | |
1634 | sregs->apic_base = vcpu->apic_base; | |
1635 | ||
1636 | memcpy(sregs->interrupt_bitmap, vcpu->irq_pending, | |
1637 | sizeof sregs->interrupt_bitmap); | |
1638 | ||
1639 | vcpu_put(vcpu); | |
1640 | ||
1641 | return 0; | |
1642 | } | |
1643 | ||
1644 | static void set_segment(struct kvm_vcpu *vcpu, | |
1645 | struct kvm_segment *var, int seg) | |
1646 | { | |
1647 | return kvm_arch_ops->set_segment(vcpu, var, seg); | |
1648 | } | |
1649 | ||
1650 | static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs) | |
1651 | { | |
1652 | struct kvm_vcpu *vcpu; | |
1653 | int mmu_reset_needed = 0; | |
1654 | int i; | |
1655 | struct descriptor_table dt; | |
1656 | ||
5aacf0ca | 1657 | if (!valid_vcpu(sregs->vcpu)) |
6aa8b732 AK |
1658 | return -EINVAL; |
1659 | vcpu = vcpu_load(kvm, sregs->vcpu); | |
1660 | if (!vcpu) | |
1661 | return -ENOENT; | |
1662 | ||
1663 | set_segment(vcpu, &sregs->cs, VCPU_SREG_CS); | |
1664 | set_segment(vcpu, &sregs->ds, VCPU_SREG_DS); | |
1665 | set_segment(vcpu, &sregs->es, VCPU_SREG_ES); | |
1666 | set_segment(vcpu, &sregs->fs, VCPU_SREG_FS); | |
1667 | set_segment(vcpu, &sregs->gs, VCPU_SREG_GS); | |
1668 | set_segment(vcpu, &sregs->ss, VCPU_SREG_SS); | |
1669 | ||
1670 | set_segment(vcpu, &sregs->tr, VCPU_SREG_TR); | |
1671 | set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); | |
1672 | ||
1673 | dt.limit = sregs->idt.limit; | |
1674 | dt.base = sregs->idt.base; | |
1675 | kvm_arch_ops->set_idt(vcpu, &dt); | |
1676 | dt.limit = sregs->gdt.limit; | |
1677 | dt.base = sregs->gdt.base; | |
1678 | kvm_arch_ops->set_gdt(vcpu, &dt); | |
1679 | ||
1680 | vcpu->cr2 = sregs->cr2; | |
1681 | mmu_reset_needed |= vcpu->cr3 != sregs->cr3; | |
1682 | vcpu->cr3 = sregs->cr3; | |
1683 | ||
1684 | vcpu->cr8 = sregs->cr8; | |
1685 | ||
1686 | mmu_reset_needed |= vcpu->shadow_efer != sregs->efer; | |
05b3e0c2 | 1687 | #ifdef CONFIG_X86_64 |
6aa8b732 AK |
1688 | kvm_arch_ops->set_efer(vcpu, sregs->efer); |
1689 | #endif | |
1690 | vcpu->apic_base = sregs->apic_base; | |
1691 | ||
399badf3 AK |
1692 | kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu); |
1693 | ||
6aa8b732 AK |
1694 | mmu_reset_needed |= vcpu->cr0 != sregs->cr0; |
1695 | kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0); | |
1696 | ||
1697 | mmu_reset_needed |= vcpu->cr4 != sregs->cr4; | |
1698 | kvm_arch_ops->set_cr4(vcpu, sregs->cr4); | |
1b0973bd AK |
1699 | if (!is_long_mode(vcpu) && is_pae(vcpu)) |
1700 | load_pdptrs(vcpu, vcpu->cr3); | |
6aa8b732 AK |
1701 | |
1702 | if (mmu_reset_needed) | |
1703 | kvm_mmu_reset_context(vcpu); | |
1704 | ||
1705 | memcpy(vcpu->irq_pending, sregs->interrupt_bitmap, | |
1706 | sizeof vcpu->irq_pending); | |
1707 | vcpu->irq_summary = 0; | |
1708 | for (i = 0; i < NR_IRQ_WORDS; ++i) | |
1709 | if (vcpu->irq_pending[i]) | |
1710 | __set_bit(i, &vcpu->irq_summary); | |
1711 | ||
1712 | vcpu_put(vcpu); | |
1713 | ||
1714 | return 0; | |
1715 | } | |
1716 | ||
1717 | /* | |
1718 | * List of msr numbers which we expose to userspace through KVM_GET_MSRS | |
1719 | * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST. | |
bf591b24 MR |
1720 | * |
1721 | * This list is modified at module load time to reflect the | |
1722 | * capabilities of the host cpu. | |
6aa8b732 AK |
1723 | */ |
1724 | static u32 msrs_to_save[] = { | |
1725 | MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, | |
1726 | MSR_K6_STAR, | |
05b3e0c2 | 1727 | #ifdef CONFIG_X86_64 |
6aa8b732 AK |
1728 | MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR, |
1729 | #endif | |
1730 | MSR_IA32_TIME_STAMP_COUNTER, | |
1731 | }; | |
1732 | ||
bf591b24 MR |
1733 | static unsigned num_msrs_to_save; |
1734 | ||
6f00e68f AK |
1735 | static u32 emulated_msrs[] = { |
1736 | MSR_IA32_MISC_ENABLE, | |
1737 | }; | |
1738 | ||
bf591b24 MR |
1739 | static __init void kvm_init_msr_list(void) |
1740 | { | |
1741 | u32 dummy[2]; | |
1742 | unsigned i, j; | |
1743 | ||
1744 | for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) { | |
1745 | if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0) | |
1746 | continue; | |
1747 | if (j < i) | |
1748 | msrs_to_save[j] = msrs_to_save[i]; | |
1749 | j++; | |
1750 | } | |
1751 | num_msrs_to_save = j; | |
1752 | } | |
6aa8b732 AK |
1753 | |
1754 | /* | |
1755 | * Adapt set_msr() to msr_io()'s calling convention | |
1756 | */ | |
1757 | static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) | |
1758 | { | |
1759 | return set_msr(vcpu, index, *data); | |
1760 | } | |
1761 | ||
1762 | /* | |
1763 | * Read or write a bunch of msrs. All parameters are kernel addresses. | |
1764 | * | |
1765 | * @return number of msrs set successfully. | |
1766 | */ | |
1767 | static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs, | |
1768 | struct kvm_msr_entry *entries, | |
1769 | int (*do_msr)(struct kvm_vcpu *vcpu, | |
1770 | unsigned index, u64 *data)) | |
1771 | { | |
1772 | struct kvm_vcpu *vcpu; | |
1773 | int i; | |
1774 | ||
5aacf0ca | 1775 | if (!valid_vcpu(msrs->vcpu)) |
6aa8b732 AK |
1776 | return -EINVAL; |
1777 | ||
1778 | vcpu = vcpu_load(kvm, msrs->vcpu); | |
1779 | if (!vcpu) | |
1780 | return -ENOENT; | |
1781 | ||
1782 | for (i = 0; i < msrs->nmsrs; ++i) | |
1783 | if (do_msr(vcpu, entries[i].index, &entries[i].data)) | |
1784 | break; | |
1785 | ||
1786 | vcpu_put(vcpu); | |
1787 | ||
1788 | return i; | |
1789 | } | |
1790 | ||
1791 | /* | |
1792 | * Read or write a bunch of msrs. Parameters are user addresses. | |
1793 | * | |
1794 | * @return number of msrs set successfully. | |
1795 | */ | |
1796 | static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs, | |
1797 | int (*do_msr)(struct kvm_vcpu *vcpu, | |
1798 | unsigned index, u64 *data), | |
1799 | int writeback) | |
1800 | { | |
1801 | struct kvm_msrs msrs; | |
1802 | struct kvm_msr_entry *entries; | |
1803 | int r, n; | |
1804 | unsigned size; | |
1805 | ||
1806 | r = -EFAULT; | |
1807 | if (copy_from_user(&msrs, user_msrs, sizeof msrs)) | |
1808 | goto out; | |
1809 | ||
1810 | r = -E2BIG; | |
1811 | if (msrs.nmsrs >= MAX_IO_MSRS) | |
1812 | goto out; | |
1813 | ||
1814 | r = -ENOMEM; | |
1815 | size = sizeof(struct kvm_msr_entry) * msrs.nmsrs; | |
1816 | entries = vmalloc(size); | |
1817 | if (!entries) | |
1818 | goto out; | |
1819 | ||
1820 | r = -EFAULT; | |
1821 | if (copy_from_user(entries, user_msrs->entries, size)) | |
1822 | goto out_free; | |
1823 | ||
1824 | r = n = __msr_io(kvm, &msrs, entries, do_msr); | |
1825 | if (r < 0) | |
1826 | goto out_free; | |
1827 | ||
1828 | r = -EFAULT; | |
1829 | if (writeback && copy_to_user(user_msrs->entries, entries, size)) | |
1830 | goto out_free; | |
1831 | ||
1832 | r = n; | |
1833 | ||
1834 | out_free: | |
1835 | vfree(entries); | |
1836 | out: | |
1837 | return r; | |
1838 | } | |
1839 | ||
1840 | /* | |
1841 | * Translate a guest virtual address to a guest physical address. | |
1842 | */ | |
1843 | static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr) | |
1844 | { | |
1845 | unsigned long vaddr = tr->linear_address; | |
1846 | struct kvm_vcpu *vcpu; | |
1847 | gpa_t gpa; | |
1848 | ||
1849 | vcpu = vcpu_load(kvm, tr->vcpu); | |
1850 | if (!vcpu) | |
1851 | return -ENOENT; | |
1852 | spin_lock(&kvm->lock); | |
1853 | gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr); | |
1854 | tr->physical_address = gpa; | |
1855 | tr->valid = gpa != UNMAPPED_GVA; | |
1856 | tr->writeable = 1; | |
1857 | tr->usermode = 0; | |
1858 | spin_unlock(&kvm->lock); | |
1859 | vcpu_put(vcpu); | |
1860 | ||
1861 | return 0; | |
1862 | } | |
1863 | ||
1864 | static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq) | |
1865 | { | |
1866 | struct kvm_vcpu *vcpu; | |
1867 | ||
5aacf0ca | 1868 | if (!valid_vcpu(irq->vcpu)) |
6aa8b732 AK |
1869 | return -EINVAL; |
1870 | if (irq->irq < 0 || irq->irq >= 256) | |
1871 | return -EINVAL; | |
1872 | vcpu = vcpu_load(kvm, irq->vcpu); | |
1873 | if (!vcpu) | |
1874 | return -ENOENT; | |
1875 | ||
1876 | set_bit(irq->irq, vcpu->irq_pending); | |
1877 | set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary); | |
1878 | ||
1879 | vcpu_put(vcpu); | |
1880 | ||
1881 | return 0; | |
1882 | } | |
1883 | ||
1884 | static int kvm_dev_ioctl_debug_guest(struct kvm *kvm, | |
1885 | struct kvm_debug_guest *dbg) | |
1886 | { | |
1887 | struct kvm_vcpu *vcpu; | |
1888 | int r; | |
1889 | ||
5aacf0ca | 1890 | if (!valid_vcpu(dbg->vcpu)) |
6aa8b732 AK |
1891 | return -EINVAL; |
1892 | vcpu = vcpu_load(kvm, dbg->vcpu); | |
1893 | if (!vcpu) | |
1894 | return -ENOENT; | |
1895 | ||
1896 | r = kvm_arch_ops->set_guest_debug(vcpu, dbg); | |
1897 | ||
1898 | vcpu_put(vcpu); | |
1899 | ||
1900 | return r; | |
1901 | } | |
1902 | ||
1903 | static long kvm_dev_ioctl(struct file *filp, | |
1904 | unsigned int ioctl, unsigned long arg) | |
1905 | { | |
1906 | struct kvm *kvm = filp->private_data; | |
2f366987 | 1907 | void __user *argp = (void __user *)arg; |
6aa8b732 AK |
1908 | int r = -EINVAL; |
1909 | ||
1910 | switch (ioctl) { | |
0b76e20b AK |
1911 | case KVM_GET_API_VERSION: |
1912 | r = KVM_API_VERSION; | |
1913 | break; | |
d27d4aca | 1914 | case KVM_CREATE_VCPU: |
6aa8b732 AK |
1915 | r = kvm_dev_ioctl_create_vcpu(kvm, arg); |
1916 | if (r) | |
1917 | goto out; | |
1918 | break; | |
6aa8b732 AK |
1919 | case KVM_RUN: { |
1920 | struct kvm_run kvm_run; | |
1921 | ||
1922 | r = -EFAULT; | |
2f366987 | 1923 | if (copy_from_user(&kvm_run, argp, sizeof kvm_run)) |
6aa8b732 AK |
1924 | goto out; |
1925 | r = kvm_dev_ioctl_run(kvm, &kvm_run); | |
c1150d8c | 1926 | if (r < 0 && r != -EINTR) |
6aa8b732 | 1927 | goto out; |
2f366987 | 1928 | if (copy_to_user(argp, &kvm_run, sizeof kvm_run)) { |
c1150d8c | 1929 | r = -EFAULT; |
6aa8b732 | 1930 | goto out; |
c1150d8c | 1931 | } |
6aa8b732 AK |
1932 | break; |
1933 | } | |
1934 | case KVM_GET_REGS: { | |
1935 | struct kvm_regs kvm_regs; | |
1936 | ||
1937 | r = -EFAULT; | |
2f366987 | 1938 | if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs)) |
6aa8b732 AK |
1939 | goto out; |
1940 | r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs); | |
1941 | if (r) | |
1942 | goto out; | |
1943 | r = -EFAULT; | |
2f366987 | 1944 | if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs)) |
6aa8b732 AK |
1945 | goto out; |
1946 | r = 0; | |
1947 | break; | |
1948 | } | |
1949 | case KVM_SET_REGS: { | |
1950 | struct kvm_regs kvm_regs; | |
1951 | ||
1952 | r = -EFAULT; | |
2f366987 | 1953 | if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs)) |
6aa8b732 AK |
1954 | goto out; |
1955 | r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs); | |
1956 | if (r) | |
1957 | goto out; | |
1958 | r = 0; | |
1959 | break; | |
1960 | } | |
1961 | case KVM_GET_SREGS: { | |
1962 | struct kvm_sregs kvm_sregs; | |
1963 | ||
1964 | r = -EFAULT; | |
2f366987 | 1965 | if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs)) |
6aa8b732 AK |
1966 | goto out; |
1967 | r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs); | |
1968 | if (r) | |
1969 | goto out; | |
1970 | r = -EFAULT; | |
2f366987 | 1971 | if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs)) |
6aa8b732 AK |
1972 | goto out; |
1973 | r = 0; | |
1974 | break; | |
1975 | } | |
1976 | case KVM_SET_SREGS: { | |
1977 | struct kvm_sregs kvm_sregs; | |
1978 | ||
1979 | r = -EFAULT; | |
2f366987 | 1980 | if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs)) |
6aa8b732 AK |
1981 | goto out; |
1982 | r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs); | |
1983 | if (r) | |
1984 | goto out; | |
1985 | r = 0; | |
1986 | break; | |
1987 | } | |
1988 | case KVM_TRANSLATE: { | |
1989 | struct kvm_translation tr; | |
1990 | ||
1991 | r = -EFAULT; | |
2f366987 | 1992 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 AK |
1993 | goto out; |
1994 | r = kvm_dev_ioctl_translate(kvm, &tr); | |
1995 | if (r) | |
1996 | goto out; | |
1997 | r = -EFAULT; | |
2f366987 | 1998 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
1999 | goto out; |
2000 | r = 0; | |
2001 | break; | |
2002 | } | |
2003 | case KVM_INTERRUPT: { | |
2004 | struct kvm_interrupt irq; | |
2005 | ||
2006 | r = -EFAULT; | |
2f366987 | 2007 | if (copy_from_user(&irq, argp, sizeof irq)) |
6aa8b732 AK |
2008 | goto out; |
2009 | r = kvm_dev_ioctl_interrupt(kvm, &irq); | |
2010 | if (r) | |
2011 | goto out; | |
2012 | r = 0; | |
2013 | break; | |
2014 | } | |
2015 | case KVM_DEBUG_GUEST: { | |
2016 | struct kvm_debug_guest dbg; | |
2017 | ||
2018 | r = -EFAULT; | |
2f366987 | 2019 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 AK |
2020 | goto out; |
2021 | r = kvm_dev_ioctl_debug_guest(kvm, &dbg); | |
2022 | if (r) | |
2023 | goto out; | |
2024 | r = 0; | |
2025 | break; | |
2026 | } | |
2027 | case KVM_SET_MEMORY_REGION: { | |
2028 | struct kvm_memory_region kvm_mem; | |
2029 | ||
2030 | r = -EFAULT; | |
2f366987 | 2031 | if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem)) |
6aa8b732 AK |
2032 | goto out; |
2033 | r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem); | |
2034 | if (r) | |
2035 | goto out; | |
2036 | break; | |
2037 | } | |
2038 | case KVM_GET_DIRTY_LOG: { | |
2039 | struct kvm_dirty_log log; | |
2040 | ||
2041 | r = -EFAULT; | |
2f366987 | 2042 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 AK |
2043 | goto out; |
2044 | r = kvm_dev_ioctl_get_dirty_log(kvm, &log); | |
2045 | if (r) | |
2046 | goto out; | |
2047 | break; | |
2048 | } | |
2049 | case KVM_GET_MSRS: | |
2f366987 | 2050 | r = msr_io(kvm, argp, get_msr, 1); |
6aa8b732 AK |
2051 | break; |
2052 | case KVM_SET_MSRS: | |
2f366987 | 2053 | r = msr_io(kvm, argp, do_set_msr, 0); |
6aa8b732 AK |
2054 | break; |
2055 | case KVM_GET_MSR_INDEX_LIST: { | |
2f366987 | 2056 | struct kvm_msr_list __user *user_msr_list = argp; |
6aa8b732 AK |
2057 | struct kvm_msr_list msr_list; |
2058 | unsigned n; | |
2059 | ||
2060 | r = -EFAULT; | |
2061 | if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list)) | |
2062 | goto out; | |
2063 | n = msr_list.nmsrs; | |
6f00e68f | 2064 | msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs); |
6aa8b732 AK |
2065 | if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list)) |
2066 | goto out; | |
2067 | r = -E2BIG; | |
bf591b24 | 2068 | if (n < num_msrs_to_save) |
6aa8b732 AK |
2069 | goto out; |
2070 | r = -EFAULT; | |
2071 | if (copy_to_user(user_msr_list->indices, &msrs_to_save, | |
bf591b24 | 2072 | num_msrs_to_save * sizeof(u32))) |
6aa8b732 | 2073 | goto out; |
6f00e68f AK |
2074 | if (copy_to_user(user_msr_list->indices |
2075 | + num_msrs_to_save * sizeof(u32), | |
2076 | &emulated_msrs, | |
2077 | ARRAY_SIZE(emulated_msrs) * sizeof(u32))) | |
2078 | goto out; | |
6aa8b732 | 2079 | r = 0; |
cc1d8955 | 2080 | break; |
6aa8b732 AK |
2081 | } |
2082 | default: | |
2083 | ; | |
2084 | } | |
2085 | out: | |
2086 | return r; | |
2087 | } | |
2088 | ||
2089 | static struct page *kvm_dev_nopage(struct vm_area_struct *vma, | |
2090 | unsigned long address, | |
2091 | int *type) | |
2092 | { | |
2093 | struct kvm *kvm = vma->vm_file->private_data; | |
2094 | unsigned long pgoff; | |
2095 | struct kvm_memory_slot *slot; | |
2096 | struct page *page; | |
2097 | ||
2098 | *type = VM_FAULT_MINOR; | |
2099 | pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; | |
2100 | slot = gfn_to_memslot(kvm, pgoff); | |
2101 | if (!slot) | |
2102 | return NOPAGE_SIGBUS; | |
2103 | page = gfn_to_page(slot, pgoff); | |
2104 | if (!page) | |
2105 | return NOPAGE_SIGBUS; | |
2106 | get_page(page); | |
2107 | return page; | |
2108 | } | |
2109 | ||
2110 | static struct vm_operations_struct kvm_dev_vm_ops = { | |
2111 | .nopage = kvm_dev_nopage, | |
2112 | }; | |
2113 | ||
2114 | static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma) | |
2115 | { | |
2116 | vma->vm_ops = &kvm_dev_vm_ops; | |
2117 | return 0; | |
2118 | } | |
2119 | ||
2120 | static struct file_operations kvm_chardev_ops = { | |
2121 | .open = kvm_dev_open, | |
2122 | .release = kvm_dev_release, | |
2123 | .unlocked_ioctl = kvm_dev_ioctl, | |
2124 | .compat_ioctl = kvm_dev_ioctl, | |
2125 | .mmap = kvm_dev_mmap, | |
2126 | }; | |
2127 | ||
2128 | static struct miscdevice kvm_dev = { | |
2129 | MISC_DYNAMIC_MINOR, | |
2130 | "kvm", | |
2131 | &kvm_chardev_ops, | |
2132 | }; | |
2133 | ||
2134 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, | |
2135 | void *v) | |
2136 | { | |
2137 | if (val == SYS_RESTART) { | |
2138 | /* | |
2139 | * Some (well, at least mine) BIOSes hang on reboot if | |
2140 | * in vmx root mode. | |
2141 | */ | |
2142 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
8b6d44c7 | 2143 | on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1); |
6aa8b732 AK |
2144 | } |
2145 | return NOTIFY_OK; | |
2146 | } | |
2147 | ||
2148 | static struct notifier_block kvm_reboot_notifier = { | |
2149 | .notifier_call = kvm_reboot, | |
2150 | .priority = 0, | |
2151 | }; | |
2152 | ||
774c47f1 AK |
2153 | /* |
2154 | * Make sure that a cpu that is being hot-unplugged does not have any vcpus | |
2155 | * cached on it. | |
2156 | */ | |
2157 | static void decache_vcpus_on_cpu(int cpu) | |
2158 | { | |
2159 | struct kvm *vm; | |
2160 | struct kvm_vcpu *vcpu; | |
2161 | int i; | |
2162 | ||
2163 | spin_lock(&kvm_lock); | |
2164 | list_for_each_entry(vm, &vm_list, vm_list) | |
2165 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { | |
2166 | vcpu = &vm->vcpus[i]; | |
2167 | /* | |
2168 | * If the vcpu is locked, then it is running on some | |
2169 | * other cpu and therefore it is not cached on the | |
2170 | * cpu in question. | |
2171 | * | |
2172 | * If it's not locked, check the last cpu it executed | |
2173 | * on. | |
2174 | */ | |
2175 | if (mutex_trylock(&vcpu->mutex)) { | |
2176 | if (vcpu->cpu == cpu) { | |
2177 | kvm_arch_ops->vcpu_decache(vcpu); | |
2178 | vcpu->cpu = -1; | |
2179 | } | |
2180 | mutex_unlock(&vcpu->mutex); | |
2181 | } | |
2182 | } | |
2183 | spin_unlock(&kvm_lock); | |
2184 | } | |
2185 | ||
2186 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, | |
2187 | void *v) | |
2188 | { | |
2189 | int cpu = (long)v; | |
2190 | ||
2191 | switch (val) { | |
43934a38 | 2192 | case CPU_DOWN_PREPARE: |
774c47f1 | 2193 | case CPU_UP_CANCELED: |
43934a38 JK |
2194 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
2195 | cpu); | |
774c47f1 AK |
2196 | decache_vcpus_on_cpu(cpu); |
2197 | smp_call_function_single(cpu, kvm_arch_ops->hardware_disable, | |
2198 | NULL, 0, 1); | |
2199 | break; | |
43934a38 JK |
2200 | case CPU_ONLINE: |
2201 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", | |
2202 | cpu); | |
774c47f1 AK |
2203 | smp_call_function_single(cpu, kvm_arch_ops->hardware_enable, |
2204 | NULL, 0, 1); | |
2205 | break; | |
2206 | } | |
2207 | return NOTIFY_OK; | |
2208 | } | |
2209 | ||
2210 | static struct notifier_block kvm_cpu_notifier = { | |
2211 | .notifier_call = kvm_cpu_hotplug, | |
2212 | .priority = 20, /* must be > scheduler priority */ | |
2213 | }; | |
2214 | ||
6aa8b732 AK |
2215 | static __init void kvm_init_debug(void) |
2216 | { | |
2217 | struct kvm_stats_debugfs_item *p; | |
2218 | ||
8b6d44c7 | 2219 | debugfs_dir = debugfs_create_dir("kvm", NULL); |
6aa8b732 AK |
2220 | for (p = debugfs_entries; p->name; ++p) |
2221 | p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir, | |
2222 | p->data); | |
2223 | } | |
2224 | ||
2225 | static void kvm_exit_debug(void) | |
2226 | { | |
2227 | struct kvm_stats_debugfs_item *p; | |
2228 | ||
2229 | for (p = debugfs_entries; p->name; ++p) | |
2230 | debugfs_remove(p->dentry); | |
2231 | debugfs_remove(debugfs_dir); | |
2232 | } | |
2233 | ||
59ae6c6b AK |
2234 | static int kvm_suspend(struct sys_device *dev, pm_message_t state) |
2235 | { | |
2236 | decache_vcpus_on_cpu(raw_smp_processor_id()); | |
19d1408d | 2237 | on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1); |
59ae6c6b AK |
2238 | return 0; |
2239 | } | |
2240 | ||
2241 | static int kvm_resume(struct sys_device *dev) | |
2242 | { | |
19d1408d | 2243 | on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1); |
59ae6c6b AK |
2244 | return 0; |
2245 | } | |
2246 | ||
2247 | static struct sysdev_class kvm_sysdev_class = { | |
2248 | set_kset_name("kvm"), | |
2249 | .suspend = kvm_suspend, | |
2250 | .resume = kvm_resume, | |
2251 | }; | |
2252 | ||
2253 | static struct sys_device kvm_sysdev = { | |
2254 | .id = 0, | |
2255 | .cls = &kvm_sysdev_class, | |
2256 | }; | |
2257 | ||
6aa8b732 AK |
2258 | hpa_t bad_page_address; |
2259 | ||
37e29d90 AK |
2260 | static int kvmfs_get_sb(struct file_system_type *fs_type, int flags, |
2261 | const char *dev_name, void *data, struct vfsmount *mnt) | |
2262 | { | |
2263 | return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_MAGIC, mnt); | |
2264 | } | |
2265 | ||
2266 | static struct file_system_type kvm_fs_type = { | |
2267 | .name = "kvmfs", | |
2268 | .get_sb = kvmfs_get_sb, | |
2269 | .kill_sb = kill_anon_super, | |
2270 | }; | |
2271 | ||
6aa8b732 AK |
2272 | int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module) |
2273 | { | |
2274 | int r; | |
2275 | ||
09db28b8 YI |
2276 | if (kvm_arch_ops) { |
2277 | printk(KERN_ERR "kvm: already loaded the other module\n"); | |
2278 | return -EEXIST; | |
2279 | } | |
2280 | ||
e097f35c | 2281 | if (!ops->cpu_has_kvm_support()) { |
6aa8b732 AK |
2282 | printk(KERN_ERR "kvm: no hardware support\n"); |
2283 | return -EOPNOTSUPP; | |
2284 | } | |
e097f35c | 2285 | if (ops->disabled_by_bios()) { |
6aa8b732 AK |
2286 | printk(KERN_ERR "kvm: disabled by bios\n"); |
2287 | return -EOPNOTSUPP; | |
2288 | } | |
2289 | ||
e097f35c YI |
2290 | kvm_arch_ops = ops; |
2291 | ||
6aa8b732 AK |
2292 | r = kvm_arch_ops->hardware_setup(); |
2293 | if (r < 0) | |
2294 | return r; | |
2295 | ||
8b6d44c7 | 2296 | on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1); |
774c47f1 AK |
2297 | r = register_cpu_notifier(&kvm_cpu_notifier); |
2298 | if (r) | |
2299 | goto out_free_1; | |
6aa8b732 AK |
2300 | register_reboot_notifier(&kvm_reboot_notifier); |
2301 | ||
59ae6c6b AK |
2302 | r = sysdev_class_register(&kvm_sysdev_class); |
2303 | if (r) | |
2304 | goto out_free_2; | |
2305 | ||
2306 | r = sysdev_register(&kvm_sysdev); | |
2307 | if (r) | |
2308 | goto out_free_3; | |
2309 | ||
6aa8b732 AK |
2310 | kvm_chardev_ops.owner = module; |
2311 | ||
2312 | r = misc_register(&kvm_dev); | |
2313 | if (r) { | |
2314 | printk (KERN_ERR "kvm: misc device register failed\n"); | |
2315 | goto out_free; | |
2316 | } | |
2317 | ||
2318 | return r; | |
2319 | ||
2320 | out_free: | |
59ae6c6b AK |
2321 | sysdev_unregister(&kvm_sysdev); |
2322 | out_free_3: | |
2323 | sysdev_class_unregister(&kvm_sysdev_class); | |
2324 | out_free_2: | |
6aa8b732 | 2325 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 AK |
2326 | unregister_cpu_notifier(&kvm_cpu_notifier); |
2327 | out_free_1: | |
8b6d44c7 | 2328 | on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1); |
6aa8b732 AK |
2329 | kvm_arch_ops->hardware_unsetup(); |
2330 | return r; | |
2331 | } | |
2332 | ||
2333 | void kvm_exit_arch(void) | |
2334 | { | |
2335 | misc_deregister(&kvm_dev); | |
59ae6c6b AK |
2336 | sysdev_unregister(&kvm_sysdev); |
2337 | sysdev_class_unregister(&kvm_sysdev_class); | |
6aa8b732 | 2338 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 2339 | unregister_cpu_notifier(&kvm_cpu_notifier); |
8b6d44c7 | 2340 | on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1); |
6aa8b732 | 2341 | kvm_arch_ops->hardware_unsetup(); |
09db28b8 | 2342 | kvm_arch_ops = NULL; |
6aa8b732 AK |
2343 | } |
2344 | ||
2345 | static __init int kvm_init(void) | |
2346 | { | |
2347 | static struct page *bad_page; | |
37e29d90 AK |
2348 | int r; |
2349 | ||
2350 | r = register_filesystem(&kvm_fs_type); | |
2351 | if (r) | |
2352 | goto out3; | |
6aa8b732 | 2353 | |
37e29d90 AK |
2354 | kvmfs_mnt = kern_mount(&kvm_fs_type); |
2355 | r = PTR_ERR(kvmfs_mnt); | |
2356 | if (IS_ERR(kvmfs_mnt)) | |
2357 | goto out2; | |
6aa8b732 AK |
2358 | kvm_init_debug(); |
2359 | ||
bf591b24 MR |
2360 | kvm_init_msr_list(); |
2361 | ||
6aa8b732 AK |
2362 | if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) { |
2363 | r = -ENOMEM; | |
2364 | goto out; | |
2365 | } | |
2366 | ||
2367 | bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT; | |
2368 | memset(__va(bad_page_address), 0, PAGE_SIZE); | |
2369 | ||
2370 | return r; | |
2371 | ||
2372 | out: | |
2373 | kvm_exit_debug(); | |
37e29d90 AK |
2374 | mntput(kvmfs_mnt); |
2375 | out2: | |
2376 | unregister_filesystem(&kvm_fs_type); | |
2377 | out3: | |
6aa8b732 AK |
2378 | return r; |
2379 | } | |
2380 | ||
2381 | static __exit void kvm_exit(void) | |
2382 | { | |
2383 | kvm_exit_debug(); | |
2384 | __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT)); | |
37e29d90 AK |
2385 | mntput(kvmfs_mnt); |
2386 | unregister_filesystem(&kvm_fs_type); | |
6aa8b732 AK |
2387 | } |
2388 | ||
2389 | module_init(kvm_init) | |
2390 | module_exit(kvm_exit) | |
2391 | ||
2392 | EXPORT_SYMBOL_GPL(kvm_init_arch); | |
2393 | EXPORT_SYMBOL_GPL(kvm_exit_arch); |