Commit | Line | Data |
---|---|---|
043405e1 CO |
1 | /* |
2 | * Kernel-based Virtual Machine driver for Linux | |
3 | * | |
4 | * derived from drivers/kvm/kvm_main.c | |
5 | * | |
6 | * Copyright (C) 2006 Qumranet, Inc. | |
7 | * | |
8 | * Authors: | |
9 | * Avi Kivity <avi@qumranet.com> | |
10 | * Yaniv Kamay <yaniv@qumranet.com> | |
11 | * | |
12 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
13 | * the COPYING file in the top-level directory. | |
14 | * | |
15 | */ | |
16 | ||
313a3dc7 | 17 | #include "kvm.h" |
043405e1 | 18 | #include "x86.h" |
5fb76f9b | 19 | #include "segment_descriptor.h" |
313a3dc7 CO |
20 | #include "irq.h" |
21 | ||
22 | #include <linux/kvm.h> | |
23 | #include <linux/fs.h> | |
24 | #include <linux/vmalloc.h> | |
5fb76f9b | 25 | #include <linux/module.h> |
043405e1 CO |
26 | |
27 | #include <asm/uaccess.h> | |
28 | ||
313a3dc7 | 29 | #define MAX_IO_MSRS 256 |
a03490ed CO |
30 | #define CR0_RESERVED_BITS \ |
31 | (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \ | |
32 | | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \ | |
33 | | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG)) | |
34 | #define CR4_RESERVED_BITS \ | |
35 | (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\ | |
36 | | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \ | |
37 | | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \ | |
38 | | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE)) | |
39 | ||
40 | #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR) | |
15c4a640 | 41 | #define EFER_RESERVED_BITS 0xfffffffffffff2fe |
313a3dc7 | 42 | |
417bc304 HB |
43 | #define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x) |
44 | ||
45 | struct kvm_stats_debugfs_item debugfs_entries[] = { | |
46 | { "pf_fixed", STAT_OFFSET(pf_fixed) }, | |
47 | { "pf_guest", STAT_OFFSET(pf_guest) }, | |
48 | { "tlb_flush", STAT_OFFSET(tlb_flush) }, | |
49 | { "invlpg", STAT_OFFSET(invlpg) }, | |
50 | { "exits", STAT_OFFSET(exits) }, | |
51 | { "io_exits", STAT_OFFSET(io_exits) }, | |
52 | { "mmio_exits", STAT_OFFSET(mmio_exits) }, | |
53 | { "signal_exits", STAT_OFFSET(signal_exits) }, | |
54 | { "irq_window", STAT_OFFSET(irq_window_exits) }, | |
55 | { "halt_exits", STAT_OFFSET(halt_exits) }, | |
56 | { "halt_wakeup", STAT_OFFSET(halt_wakeup) }, | |
57 | { "request_irq", STAT_OFFSET(request_irq_exits) }, | |
58 | { "irq_exits", STAT_OFFSET(irq_exits) }, | |
59 | { "light_exits", STAT_OFFSET(light_exits) }, | |
60 | { "efer_reload", STAT_OFFSET(efer_reload) }, | |
61 | { NULL } | |
62 | }; | |
63 | ||
64 | ||
5fb76f9b CO |
65 | unsigned long segment_base(u16 selector) |
66 | { | |
67 | struct descriptor_table gdt; | |
68 | struct segment_descriptor *d; | |
69 | unsigned long table_base; | |
70 | unsigned long v; | |
71 | ||
72 | if (selector == 0) | |
73 | return 0; | |
74 | ||
75 | asm("sgdt %0" : "=m"(gdt)); | |
76 | table_base = gdt.base; | |
77 | ||
78 | if (selector & 4) { /* from ldt */ | |
79 | u16 ldt_selector; | |
80 | ||
81 | asm("sldt %0" : "=g"(ldt_selector)); | |
82 | table_base = segment_base(ldt_selector); | |
83 | } | |
84 | d = (struct segment_descriptor *)(table_base + (selector & ~7)); | |
85 | v = d->base_low | ((unsigned long)d->base_mid << 16) | | |
86 | ((unsigned long)d->base_high << 24); | |
87 | #ifdef CONFIG_X86_64 | |
88 | if (d->system == 0 && (d->type == 2 || d->type == 9 || d->type == 11)) | |
89 | v |= ((unsigned long) \ | |
90 | ((struct segment_descriptor_64 *)d)->base_higher) << 32; | |
91 | #endif | |
92 | return v; | |
93 | } | |
94 | EXPORT_SYMBOL_GPL(segment_base); | |
95 | ||
6866b83e CO |
96 | u64 kvm_get_apic_base(struct kvm_vcpu *vcpu) |
97 | { | |
98 | if (irqchip_in_kernel(vcpu->kvm)) | |
99 | return vcpu->apic_base; | |
100 | else | |
101 | return vcpu->apic_base; | |
102 | } | |
103 | EXPORT_SYMBOL_GPL(kvm_get_apic_base); | |
104 | ||
105 | void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data) | |
106 | { | |
107 | /* TODO: reserve bits check */ | |
108 | if (irqchip_in_kernel(vcpu->kvm)) | |
109 | kvm_lapic_set_base(vcpu, data); | |
110 | else | |
111 | vcpu->apic_base = data; | |
112 | } | |
113 | EXPORT_SYMBOL_GPL(kvm_set_apic_base); | |
114 | ||
a03490ed CO |
115 | static void inject_gp(struct kvm_vcpu *vcpu) |
116 | { | |
117 | kvm_x86_ops->inject_gp(vcpu, 0); | |
118 | } | |
119 | ||
120 | /* | |
121 | * Load the pae pdptrs. Return true is they are all valid. | |
122 | */ | |
123 | int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3) | |
124 | { | |
125 | gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT; | |
126 | unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2; | |
127 | int i; | |
128 | int ret; | |
129 | u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)]; | |
130 | ||
131 | mutex_lock(&vcpu->kvm->lock); | |
132 | ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte, | |
133 | offset * sizeof(u64), sizeof(pdpte)); | |
134 | if (ret < 0) { | |
135 | ret = 0; | |
136 | goto out; | |
137 | } | |
138 | for (i = 0; i < ARRAY_SIZE(pdpte); ++i) { | |
139 | if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) { | |
140 | ret = 0; | |
141 | goto out; | |
142 | } | |
143 | } | |
144 | ret = 1; | |
145 | ||
146 | memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs)); | |
147 | out: | |
148 | mutex_unlock(&vcpu->kvm->lock); | |
149 | ||
150 | return ret; | |
151 | } | |
152 | ||
153 | void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) | |
154 | { | |
155 | if (cr0 & CR0_RESERVED_BITS) { | |
156 | printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n", | |
157 | cr0, vcpu->cr0); | |
158 | inject_gp(vcpu); | |
159 | return; | |
160 | } | |
161 | ||
162 | if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) { | |
163 | printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n"); | |
164 | inject_gp(vcpu); | |
165 | return; | |
166 | } | |
167 | ||
168 | if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) { | |
169 | printk(KERN_DEBUG "set_cr0: #GP, set PG flag " | |
170 | "and a clear PE flag\n"); | |
171 | inject_gp(vcpu); | |
172 | return; | |
173 | } | |
174 | ||
175 | if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) { | |
176 | #ifdef CONFIG_X86_64 | |
177 | if ((vcpu->shadow_efer & EFER_LME)) { | |
178 | int cs_db, cs_l; | |
179 | ||
180 | if (!is_pae(vcpu)) { | |
181 | printk(KERN_DEBUG "set_cr0: #GP, start paging " | |
182 | "in long mode while PAE is disabled\n"); | |
183 | inject_gp(vcpu); | |
184 | return; | |
185 | } | |
186 | kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); | |
187 | if (cs_l) { | |
188 | printk(KERN_DEBUG "set_cr0: #GP, start paging " | |
189 | "in long mode while CS.L == 1\n"); | |
190 | inject_gp(vcpu); | |
191 | return; | |
192 | ||
193 | } | |
194 | } else | |
195 | #endif | |
196 | if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) { | |
197 | printk(KERN_DEBUG "set_cr0: #GP, pdptrs " | |
198 | "reserved bits\n"); | |
199 | inject_gp(vcpu); | |
200 | return; | |
201 | } | |
202 | ||
203 | } | |
204 | ||
205 | kvm_x86_ops->set_cr0(vcpu, cr0); | |
206 | vcpu->cr0 = cr0; | |
207 | ||
208 | mutex_lock(&vcpu->kvm->lock); | |
209 | kvm_mmu_reset_context(vcpu); | |
210 | mutex_unlock(&vcpu->kvm->lock); | |
211 | return; | |
212 | } | |
213 | EXPORT_SYMBOL_GPL(set_cr0); | |
214 | ||
215 | void lmsw(struct kvm_vcpu *vcpu, unsigned long msw) | |
216 | { | |
217 | set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f)); | |
218 | } | |
219 | EXPORT_SYMBOL_GPL(lmsw); | |
220 | ||
221 | void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) | |
222 | { | |
223 | if (cr4 & CR4_RESERVED_BITS) { | |
224 | printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n"); | |
225 | inject_gp(vcpu); | |
226 | return; | |
227 | } | |
228 | ||
229 | if (is_long_mode(vcpu)) { | |
230 | if (!(cr4 & X86_CR4_PAE)) { | |
231 | printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while " | |
232 | "in long mode\n"); | |
233 | inject_gp(vcpu); | |
234 | return; | |
235 | } | |
236 | } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE) | |
237 | && !load_pdptrs(vcpu, vcpu->cr3)) { | |
238 | printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n"); | |
239 | inject_gp(vcpu); | |
240 | return; | |
241 | } | |
242 | ||
243 | if (cr4 & X86_CR4_VMXE) { | |
244 | printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n"); | |
245 | inject_gp(vcpu); | |
246 | return; | |
247 | } | |
248 | kvm_x86_ops->set_cr4(vcpu, cr4); | |
249 | vcpu->cr4 = cr4; | |
250 | mutex_lock(&vcpu->kvm->lock); | |
251 | kvm_mmu_reset_context(vcpu); | |
252 | mutex_unlock(&vcpu->kvm->lock); | |
253 | } | |
254 | EXPORT_SYMBOL_GPL(set_cr4); | |
255 | ||
256 | void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) | |
257 | { | |
258 | if (is_long_mode(vcpu)) { | |
259 | if (cr3 & CR3_L_MODE_RESERVED_BITS) { | |
260 | printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n"); | |
261 | inject_gp(vcpu); | |
262 | return; | |
263 | } | |
264 | } else { | |
265 | if (is_pae(vcpu)) { | |
266 | if (cr3 & CR3_PAE_RESERVED_BITS) { | |
267 | printk(KERN_DEBUG | |
268 | "set_cr3: #GP, reserved bits\n"); | |
269 | inject_gp(vcpu); | |
270 | return; | |
271 | } | |
272 | if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) { | |
273 | printk(KERN_DEBUG "set_cr3: #GP, pdptrs " | |
274 | "reserved bits\n"); | |
275 | inject_gp(vcpu); | |
276 | return; | |
277 | } | |
278 | } | |
279 | /* | |
280 | * We don't check reserved bits in nonpae mode, because | |
281 | * this isn't enforced, and VMware depends on this. | |
282 | */ | |
283 | } | |
284 | ||
285 | mutex_lock(&vcpu->kvm->lock); | |
286 | /* | |
287 | * Does the new cr3 value map to physical memory? (Note, we | |
288 | * catch an invalid cr3 even in real-mode, because it would | |
289 | * cause trouble later on when we turn on paging anyway.) | |
290 | * | |
291 | * A real CPU would silently accept an invalid cr3 and would | |
292 | * attempt to use it - with largely undefined (and often hard | |
293 | * to debug) behavior on the guest side. | |
294 | */ | |
295 | if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT))) | |
296 | inject_gp(vcpu); | |
297 | else { | |
298 | vcpu->cr3 = cr3; | |
299 | vcpu->mmu.new_cr3(vcpu); | |
300 | } | |
301 | mutex_unlock(&vcpu->kvm->lock); | |
302 | } | |
303 | EXPORT_SYMBOL_GPL(set_cr3); | |
304 | ||
305 | void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8) | |
306 | { | |
307 | if (cr8 & CR8_RESERVED_BITS) { | |
308 | printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8); | |
309 | inject_gp(vcpu); | |
310 | return; | |
311 | } | |
312 | if (irqchip_in_kernel(vcpu->kvm)) | |
313 | kvm_lapic_set_tpr(vcpu, cr8); | |
314 | else | |
315 | vcpu->cr8 = cr8; | |
316 | } | |
317 | EXPORT_SYMBOL_GPL(set_cr8); | |
318 | ||
319 | unsigned long get_cr8(struct kvm_vcpu *vcpu) | |
320 | { | |
321 | if (irqchip_in_kernel(vcpu->kvm)) | |
322 | return kvm_lapic_get_cr8(vcpu); | |
323 | else | |
324 | return vcpu->cr8; | |
325 | } | |
326 | EXPORT_SYMBOL_GPL(get_cr8); | |
327 | ||
043405e1 CO |
328 | /* |
329 | * List of msr numbers which we expose to userspace through KVM_GET_MSRS | |
330 | * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST. | |
331 | * | |
332 | * This list is modified at module load time to reflect the | |
333 | * capabilities of the host cpu. | |
334 | */ | |
335 | static u32 msrs_to_save[] = { | |
336 | MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, | |
337 | MSR_K6_STAR, | |
338 | #ifdef CONFIG_X86_64 | |
339 | MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR, | |
340 | #endif | |
341 | MSR_IA32_TIME_STAMP_COUNTER, | |
342 | }; | |
343 | ||
344 | static unsigned num_msrs_to_save; | |
345 | ||
346 | static u32 emulated_msrs[] = { | |
347 | MSR_IA32_MISC_ENABLE, | |
348 | }; | |
349 | ||
15c4a640 CO |
350 | #ifdef CONFIG_X86_64 |
351 | ||
352 | static void set_efer(struct kvm_vcpu *vcpu, u64 efer) | |
353 | { | |
354 | if (efer & EFER_RESERVED_BITS) { | |
355 | printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n", | |
356 | efer); | |
357 | inject_gp(vcpu); | |
358 | return; | |
359 | } | |
360 | ||
361 | if (is_paging(vcpu) | |
362 | && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) { | |
363 | printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n"); | |
364 | inject_gp(vcpu); | |
365 | return; | |
366 | } | |
367 | ||
368 | kvm_x86_ops->set_efer(vcpu, efer); | |
369 | ||
370 | efer &= ~EFER_LMA; | |
371 | efer |= vcpu->shadow_efer & EFER_LMA; | |
372 | ||
373 | vcpu->shadow_efer = efer; | |
374 | } | |
375 | ||
376 | #endif | |
377 | ||
378 | /* | |
379 | * Writes msr value into into the appropriate "register". | |
380 | * Returns 0 on success, non-0 otherwise. | |
381 | * Assumes vcpu_load() was already called. | |
382 | */ | |
383 | int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) | |
384 | { | |
385 | return kvm_x86_ops->set_msr(vcpu, msr_index, data); | |
386 | } | |
387 | ||
313a3dc7 CO |
388 | /* |
389 | * Adapt set_msr() to msr_io()'s calling convention | |
390 | */ | |
391 | static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) | |
392 | { | |
393 | return kvm_set_msr(vcpu, index, *data); | |
394 | } | |
395 | ||
15c4a640 CO |
396 | |
397 | int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) | |
398 | { | |
399 | switch (msr) { | |
400 | #ifdef CONFIG_X86_64 | |
401 | case MSR_EFER: | |
402 | set_efer(vcpu, data); | |
403 | break; | |
404 | #endif | |
405 | case MSR_IA32_MC0_STATUS: | |
406 | pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n", | |
407 | __FUNCTION__, data); | |
408 | break; | |
409 | case MSR_IA32_MCG_STATUS: | |
410 | pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n", | |
411 | __FUNCTION__, data); | |
412 | break; | |
413 | case MSR_IA32_UCODE_REV: | |
414 | case MSR_IA32_UCODE_WRITE: | |
415 | case 0x200 ... 0x2ff: /* MTRRs */ | |
416 | break; | |
417 | case MSR_IA32_APICBASE: | |
418 | kvm_set_apic_base(vcpu, data); | |
419 | break; | |
420 | case MSR_IA32_MISC_ENABLE: | |
421 | vcpu->ia32_misc_enable_msr = data; | |
422 | break; | |
423 | default: | |
424 | pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr); | |
425 | return 1; | |
426 | } | |
427 | return 0; | |
428 | } | |
429 | EXPORT_SYMBOL_GPL(kvm_set_msr_common); | |
430 | ||
431 | ||
432 | /* | |
433 | * Reads an msr value (of 'msr_index') into 'pdata'. | |
434 | * Returns 0 on success, non-0 otherwise. | |
435 | * Assumes vcpu_load() was already called. | |
436 | */ | |
437 | int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) | |
438 | { | |
439 | return kvm_x86_ops->get_msr(vcpu, msr_index, pdata); | |
440 | } | |
441 | ||
442 | int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) | |
443 | { | |
444 | u64 data; | |
445 | ||
446 | switch (msr) { | |
447 | case 0xc0010010: /* SYSCFG */ | |
448 | case 0xc0010015: /* HWCR */ | |
449 | case MSR_IA32_PLATFORM_ID: | |
450 | case MSR_IA32_P5_MC_ADDR: | |
451 | case MSR_IA32_P5_MC_TYPE: | |
452 | case MSR_IA32_MC0_CTL: | |
453 | case MSR_IA32_MCG_STATUS: | |
454 | case MSR_IA32_MCG_CAP: | |
455 | case MSR_IA32_MC0_MISC: | |
456 | case MSR_IA32_MC0_MISC+4: | |
457 | case MSR_IA32_MC0_MISC+8: | |
458 | case MSR_IA32_MC0_MISC+12: | |
459 | case MSR_IA32_MC0_MISC+16: | |
460 | case MSR_IA32_UCODE_REV: | |
461 | case MSR_IA32_PERF_STATUS: | |
462 | case MSR_IA32_EBL_CR_POWERON: | |
463 | /* MTRR registers */ | |
464 | case 0xfe: | |
465 | case 0x200 ... 0x2ff: | |
466 | data = 0; | |
467 | break; | |
468 | case 0xcd: /* fsb frequency */ | |
469 | data = 3; | |
470 | break; | |
471 | case MSR_IA32_APICBASE: | |
472 | data = kvm_get_apic_base(vcpu); | |
473 | break; | |
474 | case MSR_IA32_MISC_ENABLE: | |
475 | data = vcpu->ia32_misc_enable_msr; | |
476 | break; | |
477 | #ifdef CONFIG_X86_64 | |
478 | case MSR_EFER: | |
479 | data = vcpu->shadow_efer; | |
480 | break; | |
481 | #endif | |
482 | default: | |
483 | pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr); | |
484 | return 1; | |
485 | } | |
486 | *pdata = data; | |
487 | return 0; | |
488 | } | |
489 | EXPORT_SYMBOL_GPL(kvm_get_msr_common); | |
490 | ||
313a3dc7 CO |
491 | /* |
492 | * Read or write a bunch of msrs. All parameters are kernel addresses. | |
493 | * | |
494 | * @return number of msrs set successfully. | |
495 | */ | |
496 | static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs, | |
497 | struct kvm_msr_entry *entries, | |
498 | int (*do_msr)(struct kvm_vcpu *vcpu, | |
499 | unsigned index, u64 *data)) | |
500 | { | |
501 | int i; | |
502 | ||
503 | vcpu_load(vcpu); | |
504 | ||
505 | for (i = 0; i < msrs->nmsrs; ++i) | |
506 | if (do_msr(vcpu, entries[i].index, &entries[i].data)) | |
507 | break; | |
508 | ||
509 | vcpu_put(vcpu); | |
510 | ||
511 | return i; | |
512 | } | |
513 | ||
514 | /* | |
515 | * Read or write a bunch of msrs. Parameters are user addresses. | |
516 | * | |
517 | * @return number of msrs set successfully. | |
518 | */ | |
519 | static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs, | |
520 | int (*do_msr)(struct kvm_vcpu *vcpu, | |
521 | unsigned index, u64 *data), | |
522 | int writeback) | |
523 | { | |
524 | struct kvm_msrs msrs; | |
525 | struct kvm_msr_entry *entries; | |
526 | int r, n; | |
527 | unsigned size; | |
528 | ||
529 | r = -EFAULT; | |
530 | if (copy_from_user(&msrs, user_msrs, sizeof msrs)) | |
531 | goto out; | |
532 | ||
533 | r = -E2BIG; | |
534 | if (msrs.nmsrs >= MAX_IO_MSRS) | |
535 | goto out; | |
536 | ||
537 | r = -ENOMEM; | |
538 | size = sizeof(struct kvm_msr_entry) * msrs.nmsrs; | |
539 | entries = vmalloc(size); | |
540 | if (!entries) | |
541 | goto out; | |
542 | ||
543 | r = -EFAULT; | |
544 | if (copy_from_user(entries, user_msrs->entries, size)) | |
545 | goto out_free; | |
546 | ||
547 | r = n = __msr_io(vcpu, &msrs, entries, do_msr); | |
548 | if (r < 0) | |
549 | goto out_free; | |
550 | ||
551 | r = -EFAULT; | |
552 | if (writeback && copy_to_user(user_msrs->entries, entries, size)) | |
553 | goto out_free; | |
554 | ||
555 | r = n; | |
556 | ||
557 | out_free: | |
558 | vfree(entries); | |
559 | out: | |
560 | return r; | |
561 | } | |
562 | ||
043405e1 CO |
563 | long kvm_arch_dev_ioctl(struct file *filp, |
564 | unsigned int ioctl, unsigned long arg) | |
565 | { | |
566 | void __user *argp = (void __user *)arg; | |
567 | long r; | |
568 | ||
569 | switch (ioctl) { | |
570 | case KVM_GET_MSR_INDEX_LIST: { | |
571 | struct kvm_msr_list __user *user_msr_list = argp; | |
572 | struct kvm_msr_list msr_list; | |
573 | unsigned n; | |
574 | ||
575 | r = -EFAULT; | |
576 | if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list)) | |
577 | goto out; | |
578 | n = msr_list.nmsrs; | |
579 | msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs); | |
580 | if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list)) | |
581 | goto out; | |
582 | r = -E2BIG; | |
583 | if (n < num_msrs_to_save) | |
584 | goto out; | |
585 | r = -EFAULT; | |
586 | if (copy_to_user(user_msr_list->indices, &msrs_to_save, | |
587 | num_msrs_to_save * sizeof(u32))) | |
588 | goto out; | |
589 | if (copy_to_user(user_msr_list->indices | |
590 | + num_msrs_to_save * sizeof(u32), | |
591 | &emulated_msrs, | |
592 | ARRAY_SIZE(emulated_msrs) * sizeof(u32))) | |
593 | goto out; | |
594 | r = 0; | |
595 | break; | |
596 | } | |
597 | default: | |
598 | r = -EINVAL; | |
599 | } | |
600 | out: | |
601 | return r; | |
602 | } | |
603 | ||
313a3dc7 CO |
604 | void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) |
605 | { | |
606 | kvm_x86_ops->vcpu_load(vcpu, cpu); | |
607 | } | |
608 | ||
609 | void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) | |
610 | { | |
611 | kvm_x86_ops->vcpu_put(vcpu); | |
612 | } | |
613 | ||
614 | static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu) | |
615 | { | |
616 | u64 efer; | |
617 | int i; | |
618 | struct kvm_cpuid_entry *e, *entry; | |
619 | ||
620 | rdmsrl(MSR_EFER, efer); | |
621 | entry = NULL; | |
622 | for (i = 0; i < vcpu->cpuid_nent; ++i) { | |
623 | e = &vcpu->cpuid_entries[i]; | |
624 | if (e->function == 0x80000001) { | |
625 | entry = e; | |
626 | break; | |
627 | } | |
628 | } | |
629 | if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) { | |
630 | entry->edx &= ~(1 << 20); | |
631 | printk(KERN_INFO "kvm: guest NX capability removed\n"); | |
632 | } | |
633 | } | |
634 | ||
635 | static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, | |
636 | struct kvm_cpuid *cpuid, | |
637 | struct kvm_cpuid_entry __user *entries) | |
638 | { | |
639 | int r; | |
640 | ||
641 | r = -E2BIG; | |
642 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
643 | goto out; | |
644 | r = -EFAULT; | |
645 | if (copy_from_user(&vcpu->cpuid_entries, entries, | |
646 | cpuid->nent * sizeof(struct kvm_cpuid_entry))) | |
647 | goto out; | |
648 | vcpu->cpuid_nent = cpuid->nent; | |
649 | cpuid_fix_nx_cap(vcpu); | |
650 | return 0; | |
651 | ||
652 | out: | |
653 | return r; | |
654 | } | |
655 | ||
656 | static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu, | |
657 | struct kvm_lapic_state *s) | |
658 | { | |
659 | vcpu_load(vcpu); | |
660 | memcpy(s->regs, vcpu->apic->regs, sizeof *s); | |
661 | vcpu_put(vcpu); | |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
666 | static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, | |
667 | struct kvm_lapic_state *s) | |
668 | { | |
669 | vcpu_load(vcpu); | |
670 | memcpy(vcpu->apic->regs, s->regs, sizeof *s); | |
671 | kvm_apic_post_state_restore(vcpu); | |
672 | vcpu_put(vcpu); | |
673 | ||
674 | return 0; | |
675 | } | |
676 | ||
677 | long kvm_arch_vcpu_ioctl(struct file *filp, | |
678 | unsigned int ioctl, unsigned long arg) | |
679 | { | |
680 | struct kvm_vcpu *vcpu = filp->private_data; | |
681 | void __user *argp = (void __user *)arg; | |
682 | int r; | |
683 | ||
684 | switch (ioctl) { | |
685 | case KVM_GET_LAPIC: { | |
686 | struct kvm_lapic_state lapic; | |
687 | ||
688 | memset(&lapic, 0, sizeof lapic); | |
689 | r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic); | |
690 | if (r) | |
691 | goto out; | |
692 | r = -EFAULT; | |
693 | if (copy_to_user(argp, &lapic, sizeof lapic)) | |
694 | goto out; | |
695 | r = 0; | |
696 | break; | |
697 | } | |
698 | case KVM_SET_LAPIC: { | |
699 | struct kvm_lapic_state lapic; | |
700 | ||
701 | r = -EFAULT; | |
702 | if (copy_from_user(&lapic, argp, sizeof lapic)) | |
703 | goto out; | |
704 | r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);; | |
705 | if (r) | |
706 | goto out; | |
707 | r = 0; | |
708 | break; | |
709 | } | |
710 | case KVM_SET_CPUID: { | |
711 | struct kvm_cpuid __user *cpuid_arg = argp; | |
712 | struct kvm_cpuid cpuid; | |
713 | ||
714 | r = -EFAULT; | |
715 | if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) | |
716 | goto out; | |
717 | r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries); | |
718 | if (r) | |
719 | goto out; | |
720 | break; | |
721 | } | |
722 | case KVM_GET_MSRS: | |
723 | r = msr_io(vcpu, argp, kvm_get_msr, 1); | |
724 | break; | |
725 | case KVM_SET_MSRS: | |
726 | r = msr_io(vcpu, argp, do_set_msr, 0); | |
727 | break; | |
728 | default: | |
729 | r = -EINVAL; | |
730 | } | |
731 | out: | |
732 | return r; | |
733 | } | |
734 | ||
1fe779f8 CO |
735 | static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr) |
736 | { | |
737 | int ret; | |
738 | ||
739 | if (addr > (unsigned int)(-3 * PAGE_SIZE)) | |
740 | return -1; | |
741 | ret = kvm_x86_ops->set_tss_addr(kvm, addr); | |
742 | return ret; | |
743 | } | |
744 | ||
745 | static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm, | |
746 | u32 kvm_nr_mmu_pages) | |
747 | { | |
748 | if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES) | |
749 | return -EINVAL; | |
750 | ||
751 | mutex_lock(&kvm->lock); | |
752 | ||
753 | kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages); | |
754 | kvm->n_requested_mmu_pages = kvm_nr_mmu_pages; | |
755 | ||
756 | mutex_unlock(&kvm->lock); | |
757 | return 0; | |
758 | } | |
759 | ||
760 | static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm) | |
761 | { | |
762 | return kvm->n_alloc_mmu_pages; | |
763 | } | |
764 | ||
765 | /* | |
766 | * Set a new alias region. Aliases map a portion of physical memory into | |
767 | * another portion. This is useful for memory windows, for example the PC | |
768 | * VGA region. | |
769 | */ | |
770 | static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm, | |
771 | struct kvm_memory_alias *alias) | |
772 | { | |
773 | int r, n; | |
774 | struct kvm_mem_alias *p; | |
775 | ||
776 | r = -EINVAL; | |
777 | /* General sanity checks */ | |
778 | if (alias->memory_size & (PAGE_SIZE - 1)) | |
779 | goto out; | |
780 | if (alias->guest_phys_addr & (PAGE_SIZE - 1)) | |
781 | goto out; | |
782 | if (alias->slot >= KVM_ALIAS_SLOTS) | |
783 | goto out; | |
784 | if (alias->guest_phys_addr + alias->memory_size | |
785 | < alias->guest_phys_addr) | |
786 | goto out; | |
787 | if (alias->target_phys_addr + alias->memory_size | |
788 | < alias->target_phys_addr) | |
789 | goto out; | |
790 | ||
791 | mutex_lock(&kvm->lock); | |
792 | ||
793 | p = &kvm->aliases[alias->slot]; | |
794 | p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT; | |
795 | p->npages = alias->memory_size >> PAGE_SHIFT; | |
796 | p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT; | |
797 | ||
798 | for (n = KVM_ALIAS_SLOTS; n > 0; --n) | |
799 | if (kvm->aliases[n - 1].npages) | |
800 | break; | |
801 | kvm->naliases = n; | |
802 | ||
803 | kvm_mmu_zap_all(kvm); | |
804 | ||
805 | mutex_unlock(&kvm->lock); | |
806 | ||
807 | return 0; | |
808 | ||
809 | out: | |
810 | return r; | |
811 | } | |
812 | ||
813 | static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) | |
814 | { | |
815 | int r; | |
816 | ||
817 | r = 0; | |
818 | switch (chip->chip_id) { | |
819 | case KVM_IRQCHIP_PIC_MASTER: | |
820 | memcpy(&chip->chip.pic, | |
821 | &pic_irqchip(kvm)->pics[0], | |
822 | sizeof(struct kvm_pic_state)); | |
823 | break; | |
824 | case KVM_IRQCHIP_PIC_SLAVE: | |
825 | memcpy(&chip->chip.pic, | |
826 | &pic_irqchip(kvm)->pics[1], | |
827 | sizeof(struct kvm_pic_state)); | |
828 | break; | |
829 | case KVM_IRQCHIP_IOAPIC: | |
830 | memcpy(&chip->chip.ioapic, | |
831 | ioapic_irqchip(kvm), | |
832 | sizeof(struct kvm_ioapic_state)); | |
833 | break; | |
834 | default: | |
835 | r = -EINVAL; | |
836 | break; | |
837 | } | |
838 | return r; | |
839 | } | |
840 | ||
841 | static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) | |
842 | { | |
843 | int r; | |
844 | ||
845 | r = 0; | |
846 | switch (chip->chip_id) { | |
847 | case KVM_IRQCHIP_PIC_MASTER: | |
848 | memcpy(&pic_irqchip(kvm)->pics[0], | |
849 | &chip->chip.pic, | |
850 | sizeof(struct kvm_pic_state)); | |
851 | break; | |
852 | case KVM_IRQCHIP_PIC_SLAVE: | |
853 | memcpy(&pic_irqchip(kvm)->pics[1], | |
854 | &chip->chip.pic, | |
855 | sizeof(struct kvm_pic_state)); | |
856 | break; | |
857 | case KVM_IRQCHIP_IOAPIC: | |
858 | memcpy(ioapic_irqchip(kvm), | |
859 | &chip->chip.ioapic, | |
860 | sizeof(struct kvm_ioapic_state)); | |
861 | break; | |
862 | default: | |
863 | r = -EINVAL; | |
864 | break; | |
865 | } | |
866 | kvm_pic_update_irq(pic_irqchip(kvm)); | |
867 | return r; | |
868 | } | |
869 | ||
870 | long kvm_arch_vm_ioctl(struct file *filp, | |
871 | unsigned int ioctl, unsigned long arg) | |
872 | { | |
873 | struct kvm *kvm = filp->private_data; | |
874 | void __user *argp = (void __user *)arg; | |
875 | int r = -EINVAL; | |
876 | ||
877 | switch (ioctl) { | |
878 | case KVM_SET_TSS_ADDR: | |
879 | r = kvm_vm_ioctl_set_tss_addr(kvm, arg); | |
880 | if (r < 0) | |
881 | goto out; | |
882 | break; | |
883 | case KVM_SET_MEMORY_REGION: { | |
884 | struct kvm_memory_region kvm_mem; | |
885 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
886 | ||
887 | r = -EFAULT; | |
888 | if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem)) | |
889 | goto out; | |
890 | kvm_userspace_mem.slot = kvm_mem.slot; | |
891 | kvm_userspace_mem.flags = kvm_mem.flags; | |
892 | kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr; | |
893 | kvm_userspace_mem.memory_size = kvm_mem.memory_size; | |
894 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0); | |
895 | if (r) | |
896 | goto out; | |
897 | break; | |
898 | } | |
899 | case KVM_SET_NR_MMU_PAGES: | |
900 | r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg); | |
901 | if (r) | |
902 | goto out; | |
903 | break; | |
904 | case KVM_GET_NR_MMU_PAGES: | |
905 | r = kvm_vm_ioctl_get_nr_mmu_pages(kvm); | |
906 | break; | |
907 | case KVM_SET_MEMORY_ALIAS: { | |
908 | struct kvm_memory_alias alias; | |
909 | ||
910 | r = -EFAULT; | |
911 | if (copy_from_user(&alias, argp, sizeof alias)) | |
912 | goto out; | |
913 | r = kvm_vm_ioctl_set_memory_alias(kvm, &alias); | |
914 | if (r) | |
915 | goto out; | |
916 | break; | |
917 | } | |
918 | case KVM_CREATE_IRQCHIP: | |
919 | r = -ENOMEM; | |
920 | kvm->vpic = kvm_create_pic(kvm); | |
921 | if (kvm->vpic) { | |
922 | r = kvm_ioapic_init(kvm); | |
923 | if (r) { | |
924 | kfree(kvm->vpic); | |
925 | kvm->vpic = NULL; | |
926 | goto out; | |
927 | } | |
928 | } else | |
929 | goto out; | |
930 | break; | |
931 | case KVM_IRQ_LINE: { | |
932 | struct kvm_irq_level irq_event; | |
933 | ||
934 | r = -EFAULT; | |
935 | if (copy_from_user(&irq_event, argp, sizeof irq_event)) | |
936 | goto out; | |
937 | if (irqchip_in_kernel(kvm)) { | |
938 | mutex_lock(&kvm->lock); | |
939 | if (irq_event.irq < 16) | |
940 | kvm_pic_set_irq(pic_irqchip(kvm), | |
941 | irq_event.irq, | |
942 | irq_event.level); | |
943 | kvm_ioapic_set_irq(kvm->vioapic, | |
944 | irq_event.irq, | |
945 | irq_event.level); | |
946 | mutex_unlock(&kvm->lock); | |
947 | r = 0; | |
948 | } | |
949 | break; | |
950 | } | |
951 | case KVM_GET_IRQCHIP: { | |
952 | /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ | |
953 | struct kvm_irqchip chip; | |
954 | ||
955 | r = -EFAULT; | |
956 | if (copy_from_user(&chip, argp, sizeof chip)) | |
957 | goto out; | |
958 | r = -ENXIO; | |
959 | if (!irqchip_in_kernel(kvm)) | |
960 | goto out; | |
961 | r = kvm_vm_ioctl_get_irqchip(kvm, &chip); | |
962 | if (r) | |
963 | goto out; | |
964 | r = -EFAULT; | |
965 | if (copy_to_user(argp, &chip, sizeof chip)) | |
966 | goto out; | |
967 | r = 0; | |
968 | break; | |
969 | } | |
970 | case KVM_SET_IRQCHIP: { | |
971 | /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ | |
972 | struct kvm_irqchip chip; | |
973 | ||
974 | r = -EFAULT; | |
975 | if (copy_from_user(&chip, argp, sizeof chip)) | |
976 | goto out; | |
977 | r = -ENXIO; | |
978 | if (!irqchip_in_kernel(kvm)) | |
979 | goto out; | |
980 | r = kvm_vm_ioctl_set_irqchip(kvm, &chip); | |
981 | if (r) | |
982 | goto out; | |
983 | r = 0; | |
984 | break; | |
985 | } | |
986 | default: | |
987 | ; | |
988 | } | |
989 | out: | |
990 | return r; | |
991 | } | |
992 | ||
043405e1 CO |
993 | static __init void kvm_init_msr_list(void) |
994 | { | |
995 | u32 dummy[2]; | |
996 | unsigned i, j; | |
997 | ||
998 | for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) { | |
999 | if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0) | |
1000 | continue; | |
1001 | if (j < i) | |
1002 | msrs_to_save[j] = msrs_to_save[i]; | |
1003 | j++; | |
1004 | } | |
1005 | num_msrs_to_save = j; | |
1006 | } | |
1007 | ||
bbd9b64e CO |
1008 | /* |
1009 | * Only apic need an MMIO device hook, so shortcut now.. | |
1010 | */ | |
1011 | static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu, | |
1012 | gpa_t addr) | |
1013 | { | |
1014 | struct kvm_io_device *dev; | |
1015 | ||
1016 | if (vcpu->apic) { | |
1017 | dev = &vcpu->apic->dev; | |
1018 | if (dev->in_range(dev, addr)) | |
1019 | return dev; | |
1020 | } | |
1021 | return NULL; | |
1022 | } | |
1023 | ||
1024 | ||
1025 | static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu, | |
1026 | gpa_t addr) | |
1027 | { | |
1028 | struct kvm_io_device *dev; | |
1029 | ||
1030 | dev = vcpu_find_pervcpu_dev(vcpu, addr); | |
1031 | if (dev == NULL) | |
1032 | dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr); | |
1033 | return dev; | |
1034 | } | |
1035 | ||
1036 | int emulator_read_std(unsigned long addr, | |
1037 | void *val, | |
1038 | unsigned int bytes, | |
1039 | struct kvm_vcpu *vcpu) | |
1040 | { | |
1041 | void *data = val; | |
1042 | ||
1043 | while (bytes) { | |
1044 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr); | |
1045 | unsigned offset = addr & (PAGE_SIZE-1); | |
1046 | unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset); | |
1047 | int ret; | |
1048 | ||
1049 | if (gpa == UNMAPPED_GVA) | |
1050 | return X86EMUL_PROPAGATE_FAULT; | |
1051 | ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy); | |
1052 | if (ret < 0) | |
1053 | return X86EMUL_UNHANDLEABLE; | |
1054 | ||
1055 | bytes -= tocopy; | |
1056 | data += tocopy; | |
1057 | addr += tocopy; | |
1058 | } | |
1059 | ||
1060 | return X86EMUL_CONTINUE; | |
1061 | } | |
1062 | EXPORT_SYMBOL_GPL(emulator_read_std); | |
1063 | ||
1064 | static int emulator_write_std(unsigned long addr, | |
1065 | const void *val, | |
1066 | unsigned int bytes, | |
1067 | struct kvm_vcpu *vcpu) | |
1068 | { | |
1069 | pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes); | |
1070 | return X86EMUL_UNHANDLEABLE; | |
1071 | } | |
1072 | ||
1073 | static int emulator_read_emulated(unsigned long addr, | |
1074 | void *val, | |
1075 | unsigned int bytes, | |
1076 | struct kvm_vcpu *vcpu) | |
1077 | { | |
1078 | struct kvm_io_device *mmio_dev; | |
1079 | gpa_t gpa; | |
1080 | ||
1081 | if (vcpu->mmio_read_completed) { | |
1082 | memcpy(val, vcpu->mmio_data, bytes); | |
1083 | vcpu->mmio_read_completed = 0; | |
1084 | return X86EMUL_CONTINUE; | |
1085 | } | |
1086 | ||
1087 | gpa = vcpu->mmu.gva_to_gpa(vcpu, addr); | |
1088 | ||
1089 | /* For APIC access vmexit */ | |
1090 | if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) | |
1091 | goto mmio; | |
1092 | ||
1093 | if (emulator_read_std(addr, val, bytes, vcpu) | |
1094 | == X86EMUL_CONTINUE) | |
1095 | return X86EMUL_CONTINUE; | |
1096 | if (gpa == UNMAPPED_GVA) | |
1097 | return X86EMUL_PROPAGATE_FAULT; | |
1098 | ||
1099 | mmio: | |
1100 | /* | |
1101 | * Is this MMIO handled locally? | |
1102 | */ | |
1103 | mmio_dev = vcpu_find_mmio_dev(vcpu, gpa); | |
1104 | if (mmio_dev) { | |
1105 | kvm_iodevice_read(mmio_dev, gpa, bytes, val); | |
1106 | return X86EMUL_CONTINUE; | |
1107 | } | |
1108 | ||
1109 | vcpu->mmio_needed = 1; | |
1110 | vcpu->mmio_phys_addr = gpa; | |
1111 | vcpu->mmio_size = bytes; | |
1112 | vcpu->mmio_is_write = 0; | |
1113 | ||
1114 | return X86EMUL_UNHANDLEABLE; | |
1115 | } | |
1116 | ||
1117 | static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, | |
1118 | const void *val, int bytes) | |
1119 | { | |
1120 | int ret; | |
1121 | ||
1122 | ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes); | |
1123 | if (ret < 0) | |
1124 | return 0; | |
1125 | kvm_mmu_pte_write(vcpu, gpa, val, bytes); | |
1126 | return 1; | |
1127 | } | |
1128 | ||
1129 | static int emulator_write_emulated_onepage(unsigned long addr, | |
1130 | const void *val, | |
1131 | unsigned int bytes, | |
1132 | struct kvm_vcpu *vcpu) | |
1133 | { | |
1134 | struct kvm_io_device *mmio_dev; | |
1135 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr); | |
1136 | ||
1137 | if (gpa == UNMAPPED_GVA) { | |
1138 | kvm_x86_ops->inject_page_fault(vcpu, addr, 2); | |
1139 | return X86EMUL_PROPAGATE_FAULT; | |
1140 | } | |
1141 | ||
1142 | /* For APIC access vmexit */ | |
1143 | if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) | |
1144 | goto mmio; | |
1145 | ||
1146 | if (emulator_write_phys(vcpu, gpa, val, bytes)) | |
1147 | return X86EMUL_CONTINUE; | |
1148 | ||
1149 | mmio: | |
1150 | /* | |
1151 | * Is this MMIO handled locally? | |
1152 | */ | |
1153 | mmio_dev = vcpu_find_mmio_dev(vcpu, gpa); | |
1154 | if (mmio_dev) { | |
1155 | kvm_iodevice_write(mmio_dev, gpa, bytes, val); | |
1156 | return X86EMUL_CONTINUE; | |
1157 | } | |
1158 | ||
1159 | vcpu->mmio_needed = 1; | |
1160 | vcpu->mmio_phys_addr = gpa; | |
1161 | vcpu->mmio_size = bytes; | |
1162 | vcpu->mmio_is_write = 1; | |
1163 | memcpy(vcpu->mmio_data, val, bytes); | |
1164 | ||
1165 | return X86EMUL_CONTINUE; | |
1166 | } | |
1167 | ||
1168 | int emulator_write_emulated(unsigned long addr, | |
1169 | const void *val, | |
1170 | unsigned int bytes, | |
1171 | struct kvm_vcpu *vcpu) | |
1172 | { | |
1173 | /* Crossing a page boundary? */ | |
1174 | if (((addr + bytes - 1) ^ addr) & PAGE_MASK) { | |
1175 | int rc, now; | |
1176 | ||
1177 | now = -addr & ~PAGE_MASK; | |
1178 | rc = emulator_write_emulated_onepage(addr, val, now, vcpu); | |
1179 | if (rc != X86EMUL_CONTINUE) | |
1180 | return rc; | |
1181 | addr += now; | |
1182 | val += now; | |
1183 | bytes -= now; | |
1184 | } | |
1185 | return emulator_write_emulated_onepage(addr, val, bytes, vcpu); | |
1186 | } | |
1187 | EXPORT_SYMBOL_GPL(emulator_write_emulated); | |
1188 | ||
1189 | static int emulator_cmpxchg_emulated(unsigned long addr, | |
1190 | const void *old, | |
1191 | const void *new, | |
1192 | unsigned int bytes, | |
1193 | struct kvm_vcpu *vcpu) | |
1194 | { | |
1195 | static int reported; | |
1196 | ||
1197 | if (!reported) { | |
1198 | reported = 1; | |
1199 | printk(KERN_WARNING "kvm: emulating exchange as write\n"); | |
1200 | } | |
1201 | return emulator_write_emulated(addr, new, bytes, vcpu); | |
1202 | } | |
1203 | ||
1204 | static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg) | |
1205 | { | |
1206 | return kvm_x86_ops->get_segment_base(vcpu, seg); | |
1207 | } | |
1208 | ||
1209 | int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address) | |
1210 | { | |
1211 | return X86EMUL_CONTINUE; | |
1212 | } | |
1213 | ||
1214 | int emulate_clts(struct kvm_vcpu *vcpu) | |
1215 | { | |
1216 | kvm_x86_ops->set_cr0(vcpu, vcpu->cr0 & ~X86_CR0_TS); | |
1217 | return X86EMUL_CONTINUE; | |
1218 | } | |
1219 | ||
1220 | int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest) | |
1221 | { | |
1222 | struct kvm_vcpu *vcpu = ctxt->vcpu; | |
1223 | ||
1224 | switch (dr) { | |
1225 | case 0 ... 3: | |
1226 | *dest = kvm_x86_ops->get_dr(vcpu, dr); | |
1227 | return X86EMUL_CONTINUE; | |
1228 | default: | |
1229 | pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr); | |
1230 | return X86EMUL_UNHANDLEABLE; | |
1231 | } | |
1232 | } | |
1233 | ||
1234 | int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value) | |
1235 | { | |
1236 | unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U; | |
1237 | int exception; | |
1238 | ||
1239 | kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception); | |
1240 | if (exception) { | |
1241 | /* FIXME: better handling */ | |
1242 | return X86EMUL_UNHANDLEABLE; | |
1243 | } | |
1244 | return X86EMUL_CONTINUE; | |
1245 | } | |
1246 | ||
1247 | void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context) | |
1248 | { | |
1249 | static int reported; | |
1250 | u8 opcodes[4]; | |
1251 | unsigned long rip = vcpu->rip; | |
1252 | unsigned long rip_linear; | |
1253 | ||
1254 | rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS); | |
1255 | ||
1256 | if (reported) | |
1257 | return; | |
1258 | ||
1259 | emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu); | |
1260 | ||
1261 | printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n", | |
1262 | context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]); | |
1263 | reported = 1; | |
1264 | } | |
1265 | EXPORT_SYMBOL_GPL(kvm_report_emulation_failure); | |
1266 | ||
1267 | struct x86_emulate_ops emulate_ops = { | |
1268 | .read_std = emulator_read_std, | |
1269 | .write_std = emulator_write_std, | |
1270 | .read_emulated = emulator_read_emulated, | |
1271 | .write_emulated = emulator_write_emulated, | |
1272 | .cmpxchg_emulated = emulator_cmpxchg_emulated, | |
1273 | }; | |
1274 | ||
1275 | int emulate_instruction(struct kvm_vcpu *vcpu, | |
1276 | struct kvm_run *run, | |
1277 | unsigned long cr2, | |
1278 | u16 error_code, | |
1279 | int no_decode) | |
1280 | { | |
1281 | int r; | |
1282 | ||
1283 | vcpu->mmio_fault_cr2 = cr2; | |
1284 | kvm_x86_ops->cache_regs(vcpu); | |
1285 | ||
1286 | vcpu->mmio_is_write = 0; | |
1287 | vcpu->pio.string = 0; | |
1288 | ||
1289 | if (!no_decode) { | |
1290 | int cs_db, cs_l; | |
1291 | kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); | |
1292 | ||
1293 | vcpu->emulate_ctxt.vcpu = vcpu; | |
1294 | vcpu->emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu); | |
1295 | vcpu->emulate_ctxt.cr2 = cr2; | |
1296 | vcpu->emulate_ctxt.mode = | |
1297 | (vcpu->emulate_ctxt.eflags & X86_EFLAGS_VM) | |
1298 | ? X86EMUL_MODE_REAL : cs_l | |
1299 | ? X86EMUL_MODE_PROT64 : cs_db | |
1300 | ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16; | |
1301 | ||
1302 | if (vcpu->emulate_ctxt.mode == X86EMUL_MODE_PROT64) { | |
1303 | vcpu->emulate_ctxt.cs_base = 0; | |
1304 | vcpu->emulate_ctxt.ds_base = 0; | |
1305 | vcpu->emulate_ctxt.es_base = 0; | |
1306 | vcpu->emulate_ctxt.ss_base = 0; | |
1307 | } else { | |
1308 | vcpu->emulate_ctxt.cs_base = | |
1309 | get_segment_base(vcpu, VCPU_SREG_CS); | |
1310 | vcpu->emulate_ctxt.ds_base = | |
1311 | get_segment_base(vcpu, VCPU_SREG_DS); | |
1312 | vcpu->emulate_ctxt.es_base = | |
1313 | get_segment_base(vcpu, VCPU_SREG_ES); | |
1314 | vcpu->emulate_ctxt.ss_base = | |
1315 | get_segment_base(vcpu, VCPU_SREG_SS); | |
1316 | } | |
1317 | ||
1318 | vcpu->emulate_ctxt.gs_base = | |
1319 | get_segment_base(vcpu, VCPU_SREG_GS); | |
1320 | vcpu->emulate_ctxt.fs_base = | |
1321 | get_segment_base(vcpu, VCPU_SREG_FS); | |
1322 | ||
1323 | r = x86_decode_insn(&vcpu->emulate_ctxt, &emulate_ops); | |
1324 | if (r) { | |
1325 | if (kvm_mmu_unprotect_page_virt(vcpu, cr2)) | |
1326 | return EMULATE_DONE; | |
1327 | return EMULATE_FAIL; | |
1328 | } | |
1329 | } | |
1330 | ||
1331 | r = x86_emulate_insn(&vcpu->emulate_ctxt, &emulate_ops); | |
1332 | ||
1333 | if (vcpu->pio.string) | |
1334 | return EMULATE_DO_MMIO; | |
1335 | ||
1336 | if ((r || vcpu->mmio_is_write) && run) { | |
1337 | run->exit_reason = KVM_EXIT_MMIO; | |
1338 | run->mmio.phys_addr = vcpu->mmio_phys_addr; | |
1339 | memcpy(run->mmio.data, vcpu->mmio_data, 8); | |
1340 | run->mmio.len = vcpu->mmio_size; | |
1341 | run->mmio.is_write = vcpu->mmio_is_write; | |
1342 | } | |
1343 | ||
1344 | if (r) { | |
1345 | if (kvm_mmu_unprotect_page_virt(vcpu, cr2)) | |
1346 | return EMULATE_DONE; | |
1347 | if (!vcpu->mmio_needed) { | |
1348 | kvm_report_emulation_failure(vcpu, "mmio"); | |
1349 | return EMULATE_FAIL; | |
1350 | } | |
1351 | return EMULATE_DO_MMIO; | |
1352 | } | |
1353 | ||
1354 | kvm_x86_ops->decache_regs(vcpu); | |
1355 | kvm_x86_ops->set_rflags(vcpu, vcpu->emulate_ctxt.eflags); | |
1356 | ||
1357 | if (vcpu->mmio_is_write) { | |
1358 | vcpu->mmio_needed = 0; | |
1359 | return EMULATE_DO_MMIO; | |
1360 | } | |
1361 | ||
1362 | return EMULATE_DONE; | |
1363 | } | |
1364 | EXPORT_SYMBOL_GPL(emulate_instruction); | |
1365 | ||
de7d789a CO |
1366 | static void free_pio_guest_pages(struct kvm_vcpu *vcpu) |
1367 | { | |
1368 | int i; | |
1369 | ||
1370 | for (i = 0; i < ARRAY_SIZE(vcpu->pio.guest_pages); ++i) | |
1371 | if (vcpu->pio.guest_pages[i]) { | |
1372 | kvm_release_page(vcpu->pio.guest_pages[i]); | |
1373 | vcpu->pio.guest_pages[i] = NULL; | |
1374 | } | |
1375 | } | |
1376 | ||
1377 | static int pio_copy_data(struct kvm_vcpu *vcpu) | |
1378 | { | |
1379 | void *p = vcpu->pio_data; | |
1380 | void *q; | |
1381 | unsigned bytes; | |
1382 | int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1; | |
1383 | ||
1384 | q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE, | |
1385 | PAGE_KERNEL); | |
1386 | if (!q) { | |
1387 | free_pio_guest_pages(vcpu); | |
1388 | return -ENOMEM; | |
1389 | } | |
1390 | q += vcpu->pio.guest_page_offset; | |
1391 | bytes = vcpu->pio.size * vcpu->pio.cur_count; | |
1392 | if (vcpu->pio.in) | |
1393 | memcpy(q, p, bytes); | |
1394 | else | |
1395 | memcpy(p, q, bytes); | |
1396 | q -= vcpu->pio.guest_page_offset; | |
1397 | vunmap(q); | |
1398 | free_pio_guest_pages(vcpu); | |
1399 | return 0; | |
1400 | } | |
1401 | ||
1402 | int complete_pio(struct kvm_vcpu *vcpu) | |
1403 | { | |
1404 | struct kvm_pio_request *io = &vcpu->pio; | |
1405 | long delta; | |
1406 | int r; | |
1407 | ||
1408 | kvm_x86_ops->cache_regs(vcpu); | |
1409 | ||
1410 | if (!io->string) { | |
1411 | if (io->in) | |
1412 | memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data, | |
1413 | io->size); | |
1414 | } else { | |
1415 | if (io->in) { | |
1416 | r = pio_copy_data(vcpu); | |
1417 | if (r) { | |
1418 | kvm_x86_ops->cache_regs(vcpu); | |
1419 | return r; | |
1420 | } | |
1421 | } | |
1422 | ||
1423 | delta = 1; | |
1424 | if (io->rep) { | |
1425 | delta *= io->cur_count; | |
1426 | /* | |
1427 | * The size of the register should really depend on | |
1428 | * current address size. | |
1429 | */ | |
1430 | vcpu->regs[VCPU_REGS_RCX] -= delta; | |
1431 | } | |
1432 | if (io->down) | |
1433 | delta = -delta; | |
1434 | delta *= io->size; | |
1435 | if (io->in) | |
1436 | vcpu->regs[VCPU_REGS_RDI] += delta; | |
1437 | else | |
1438 | vcpu->regs[VCPU_REGS_RSI] += delta; | |
1439 | } | |
1440 | ||
1441 | kvm_x86_ops->decache_regs(vcpu); | |
1442 | ||
1443 | io->count -= io->cur_count; | |
1444 | io->cur_count = 0; | |
1445 | ||
1446 | return 0; | |
1447 | } | |
1448 | ||
1449 | static void kernel_pio(struct kvm_io_device *pio_dev, | |
1450 | struct kvm_vcpu *vcpu, | |
1451 | void *pd) | |
1452 | { | |
1453 | /* TODO: String I/O for in kernel device */ | |
1454 | ||
1455 | mutex_lock(&vcpu->kvm->lock); | |
1456 | if (vcpu->pio.in) | |
1457 | kvm_iodevice_read(pio_dev, vcpu->pio.port, | |
1458 | vcpu->pio.size, | |
1459 | pd); | |
1460 | else | |
1461 | kvm_iodevice_write(pio_dev, vcpu->pio.port, | |
1462 | vcpu->pio.size, | |
1463 | pd); | |
1464 | mutex_unlock(&vcpu->kvm->lock); | |
1465 | } | |
1466 | ||
1467 | static void pio_string_write(struct kvm_io_device *pio_dev, | |
1468 | struct kvm_vcpu *vcpu) | |
1469 | { | |
1470 | struct kvm_pio_request *io = &vcpu->pio; | |
1471 | void *pd = vcpu->pio_data; | |
1472 | int i; | |
1473 | ||
1474 | mutex_lock(&vcpu->kvm->lock); | |
1475 | for (i = 0; i < io->cur_count; i++) { | |
1476 | kvm_iodevice_write(pio_dev, io->port, | |
1477 | io->size, | |
1478 | pd); | |
1479 | pd += io->size; | |
1480 | } | |
1481 | mutex_unlock(&vcpu->kvm->lock); | |
1482 | } | |
1483 | ||
1484 | static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu, | |
1485 | gpa_t addr) | |
1486 | { | |
1487 | return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr); | |
1488 | } | |
1489 | ||
1490 | int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in, | |
1491 | int size, unsigned port) | |
1492 | { | |
1493 | struct kvm_io_device *pio_dev; | |
1494 | ||
1495 | vcpu->run->exit_reason = KVM_EXIT_IO; | |
1496 | vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; | |
1497 | vcpu->run->io.size = vcpu->pio.size = size; | |
1498 | vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE; | |
1499 | vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = 1; | |
1500 | vcpu->run->io.port = vcpu->pio.port = port; | |
1501 | vcpu->pio.in = in; | |
1502 | vcpu->pio.string = 0; | |
1503 | vcpu->pio.down = 0; | |
1504 | vcpu->pio.guest_page_offset = 0; | |
1505 | vcpu->pio.rep = 0; | |
1506 | ||
1507 | kvm_x86_ops->cache_regs(vcpu); | |
1508 | memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4); | |
1509 | kvm_x86_ops->decache_regs(vcpu); | |
1510 | ||
1511 | kvm_x86_ops->skip_emulated_instruction(vcpu); | |
1512 | ||
1513 | pio_dev = vcpu_find_pio_dev(vcpu, port); | |
1514 | if (pio_dev) { | |
1515 | kernel_pio(pio_dev, vcpu, vcpu->pio_data); | |
1516 | complete_pio(vcpu); | |
1517 | return 1; | |
1518 | } | |
1519 | return 0; | |
1520 | } | |
1521 | EXPORT_SYMBOL_GPL(kvm_emulate_pio); | |
1522 | ||
1523 | int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in, | |
1524 | int size, unsigned long count, int down, | |
1525 | gva_t address, int rep, unsigned port) | |
1526 | { | |
1527 | unsigned now, in_page; | |
1528 | int i, ret = 0; | |
1529 | int nr_pages = 1; | |
1530 | struct page *page; | |
1531 | struct kvm_io_device *pio_dev; | |
1532 | ||
1533 | vcpu->run->exit_reason = KVM_EXIT_IO; | |
1534 | vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; | |
1535 | vcpu->run->io.size = vcpu->pio.size = size; | |
1536 | vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE; | |
1537 | vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = count; | |
1538 | vcpu->run->io.port = vcpu->pio.port = port; | |
1539 | vcpu->pio.in = in; | |
1540 | vcpu->pio.string = 1; | |
1541 | vcpu->pio.down = down; | |
1542 | vcpu->pio.guest_page_offset = offset_in_page(address); | |
1543 | vcpu->pio.rep = rep; | |
1544 | ||
1545 | if (!count) { | |
1546 | kvm_x86_ops->skip_emulated_instruction(vcpu); | |
1547 | return 1; | |
1548 | } | |
1549 | ||
1550 | if (!down) | |
1551 | in_page = PAGE_SIZE - offset_in_page(address); | |
1552 | else | |
1553 | in_page = offset_in_page(address) + size; | |
1554 | now = min(count, (unsigned long)in_page / size); | |
1555 | if (!now) { | |
1556 | /* | |
1557 | * String I/O straddles page boundary. Pin two guest pages | |
1558 | * so that we satisfy atomicity constraints. Do just one | |
1559 | * transaction to avoid complexity. | |
1560 | */ | |
1561 | nr_pages = 2; | |
1562 | now = 1; | |
1563 | } | |
1564 | if (down) { | |
1565 | /* | |
1566 | * String I/O in reverse. Yuck. Kill the guest, fix later. | |
1567 | */ | |
1568 | pr_unimpl(vcpu, "guest string pio down\n"); | |
1569 | inject_gp(vcpu); | |
1570 | return 1; | |
1571 | } | |
1572 | vcpu->run->io.count = now; | |
1573 | vcpu->pio.cur_count = now; | |
1574 | ||
1575 | if (vcpu->pio.cur_count == vcpu->pio.count) | |
1576 | kvm_x86_ops->skip_emulated_instruction(vcpu); | |
1577 | ||
1578 | for (i = 0; i < nr_pages; ++i) { | |
1579 | mutex_lock(&vcpu->kvm->lock); | |
1580 | page = gva_to_page(vcpu, address + i * PAGE_SIZE); | |
1581 | vcpu->pio.guest_pages[i] = page; | |
1582 | mutex_unlock(&vcpu->kvm->lock); | |
1583 | if (!page) { | |
1584 | inject_gp(vcpu); | |
1585 | free_pio_guest_pages(vcpu); | |
1586 | return 1; | |
1587 | } | |
1588 | } | |
1589 | ||
1590 | pio_dev = vcpu_find_pio_dev(vcpu, port); | |
1591 | if (!vcpu->pio.in) { | |
1592 | /* string PIO write */ | |
1593 | ret = pio_copy_data(vcpu); | |
1594 | if (ret >= 0 && pio_dev) { | |
1595 | pio_string_write(pio_dev, vcpu); | |
1596 | complete_pio(vcpu); | |
1597 | if (vcpu->pio.count == 0) | |
1598 | ret = 1; | |
1599 | } | |
1600 | } else if (pio_dev) | |
1601 | pr_unimpl(vcpu, "no string pio read support yet, " | |
1602 | "port %x size %d count %ld\n", | |
1603 | port, size, count); | |
1604 | ||
1605 | return ret; | |
1606 | } | |
1607 | EXPORT_SYMBOL_GPL(kvm_emulate_pio_string); | |
1608 | ||
043405e1 CO |
1609 | __init void kvm_arch_init(void) |
1610 | { | |
1611 | kvm_init_msr_list(); | |
1612 | } | |
8776e519 HB |
1613 | |
1614 | int kvm_emulate_halt(struct kvm_vcpu *vcpu) | |
1615 | { | |
1616 | ++vcpu->stat.halt_exits; | |
1617 | if (irqchip_in_kernel(vcpu->kvm)) { | |
1618 | vcpu->mp_state = VCPU_MP_STATE_HALTED; | |
1619 | kvm_vcpu_block(vcpu); | |
1620 | if (vcpu->mp_state != VCPU_MP_STATE_RUNNABLE) | |
1621 | return -EINTR; | |
1622 | return 1; | |
1623 | } else { | |
1624 | vcpu->run->exit_reason = KVM_EXIT_HLT; | |
1625 | return 0; | |
1626 | } | |
1627 | } | |
1628 | EXPORT_SYMBOL_GPL(kvm_emulate_halt); | |
1629 | ||
1630 | int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) | |
1631 | { | |
1632 | unsigned long nr, a0, a1, a2, a3, ret; | |
1633 | ||
1634 | kvm_x86_ops->cache_regs(vcpu); | |
1635 | ||
1636 | nr = vcpu->regs[VCPU_REGS_RAX]; | |
1637 | a0 = vcpu->regs[VCPU_REGS_RBX]; | |
1638 | a1 = vcpu->regs[VCPU_REGS_RCX]; | |
1639 | a2 = vcpu->regs[VCPU_REGS_RDX]; | |
1640 | a3 = vcpu->regs[VCPU_REGS_RSI]; | |
1641 | ||
1642 | if (!is_long_mode(vcpu)) { | |
1643 | nr &= 0xFFFFFFFF; | |
1644 | a0 &= 0xFFFFFFFF; | |
1645 | a1 &= 0xFFFFFFFF; | |
1646 | a2 &= 0xFFFFFFFF; | |
1647 | a3 &= 0xFFFFFFFF; | |
1648 | } | |
1649 | ||
1650 | switch (nr) { | |
1651 | default: | |
1652 | ret = -KVM_ENOSYS; | |
1653 | break; | |
1654 | } | |
1655 | vcpu->regs[VCPU_REGS_RAX] = ret; | |
1656 | kvm_x86_ops->decache_regs(vcpu); | |
1657 | return 0; | |
1658 | } | |
1659 | EXPORT_SYMBOL_GPL(kvm_emulate_hypercall); | |
1660 | ||
1661 | int kvm_fix_hypercall(struct kvm_vcpu *vcpu) | |
1662 | { | |
1663 | char instruction[3]; | |
1664 | int ret = 0; | |
1665 | ||
1666 | mutex_lock(&vcpu->kvm->lock); | |
1667 | ||
1668 | /* | |
1669 | * Blow out the MMU to ensure that no other VCPU has an active mapping | |
1670 | * to ensure that the updated hypercall appears atomically across all | |
1671 | * VCPUs. | |
1672 | */ | |
1673 | kvm_mmu_zap_all(vcpu->kvm); | |
1674 | ||
1675 | kvm_x86_ops->cache_regs(vcpu); | |
1676 | kvm_x86_ops->patch_hypercall(vcpu, instruction); | |
1677 | if (emulator_write_emulated(vcpu->rip, instruction, 3, vcpu) | |
1678 | != X86EMUL_CONTINUE) | |
1679 | ret = -EFAULT; | |
1680 | ||
1681 | mutex_unlock(&vcpu->kvm->lock); | |
1682 | ||
1683 | return ret; | |
1684 | } | |
1685 | ||
1686 | static u64 mk_cr_64(u64 curr_cr, u32 new_val) | |
1687 | { | |
1688 | return (curr_cr & ~((1ULL << 32) - 1)) | new_val; | |
1689 | } | |
1690 | ||
1691 | void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) | |
1692 | { | |
1693 | struct descriptor_table dt = { limit, base }; | |
1694 | ||
1695 | kvm_x86_ops->set_gdt(vcpu, &dt); | |
1696 | } | |
1697 | ||
1698 | void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) | |
1699 | { | |
1700 | struct descriptor_table dt = { limit, base }; | |
1701 | ||
1702 | kvm_x86_ops->set_idt(vcpu, &dt); | |
1703 | } | |
1704 | ||
1705 | void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw, | |
1706 | unsigned long *rflags) | |
1707 | { | |
1708 | lmsw(vcpu, msw); | |
1709 | *rflags = kvm_x86_ops->get_rflags(vcpu); | |
1710 | } | |
1711 | ||
1712 | unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr) | |
1713 | { | |
1714 | kvm_x86_ops->decache_cr4_guest_bits(vcpu); | |
1715 | switch (cr) { | |
1716 | case 0: | |
1717 | return vcpu->cr0; | |
1718 | case 2: | |
1719 | return vcpu->cr2; | |
1720 | case 3: | |
1721 | return vcpu->cr3; | |
1722 | case 4: | |
1723 | return vcpu->cr4; | |
1724 | default: | |
1725 | vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); | |
1726 | return 0; | |
1727 | } | |
1728 | } | |
1729 | ||
1730 | void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val, | |
1731 | unsigned long *rflags) | |
1732 | { | |
1733 | switch (cr) { | |
1734 | case 0: | |
1735 | set_cr0(vcpu, mk_cr_64(vcpu->cr0, val)); | |
1736 | *rflags = kvm_x86_ops->get_rflags(vcpu); | |
1737 | break; | |
1738 | case 2: | |
1739 | vcpu->cr2 = val; | |
1740 | break; | |
1741 | case 3: | |
1742 | set_cr3(vcpu, val); | |
1743 | break; | |
1744 | case 4: | |
1745 | set_cr4(vcpu, mk_cr_64(vcpu->cr4, val)); | |
1746 | break; | |
1747 | default: | |
1748 | vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); | |
1749 | } | |
1750 | } | |
1751 | ||
1752 | void kvm_emulate_cpuid(struct kvm_vcpu *vcpu) | |
1753 | { | |
1754 | int i; | |
1755 | u32 function; | |
1756 | struct kvm_cpuid_entry *e, *best; | |
1757 | ||
1758 | kvm_x86_ops->cache_regs(vcpu); | |
1759 | function = vcpu->regs[VCPU_REGS_RAX]; | |
1760 | vcpu->regs[VCPU_REGS_RAX] = 0; | |
1761 | vcpu->regs[VCPU_REGS_RBX] = 0; | |
1762 | vcpu->regs[VCPU_REGS_RCX] = 0; | |
1763 | vcpu->regs[VCPU_REGS_RDX] = 0; | |
1764 | best = NULL; | |
1765 | for (i = 0; i < vcpu->cpuid_nent; ++i) { | |
1766 | e = &vcpu->cpuid_entries[i]; | |
1767 | if (e->function == function) { | |
1768 | best = e; | |
1769 | break; | |
1770 | } | |
1771 | /* | |
1772 | * Both basic or both extended? | |
1773 | */ | |
1774 | if (((e->function ^ function) & 0x80000000) == 0) | |
1775 | if (!best || e->function > best->function) | |
1776 | best = e; | |
1777 | } | |
1778 | if (best) { | |
1779 | vcpu->regs[VCPU_REGS_RAX] = best->eax; | |
1780 | vcpu->regs[VCPU_REGS_RBX] = best->ebx; | |
1781 | vcpu->regs[VCPU_REGS_RCX] = best->ecx; | |
1782 | vcpu->regs[VCPU_REGS_RDX] = best->edx; | |
1783 | } | |
1784 | kvm_x86_ops->decache_regs(vcpu); | |
1785 | kvm_x86_ops->skip_emulated_instruction(vcpu); | |
1786 | } | |
1787 | EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); | |
d0752060 HB |
1788 | |
1789 | /* | |
1790 | * fxsave fpu state. Taken from x86_64/processor.h. To be killed when | |
1791 | * we have asm/x86/processor.h | |
1792 | */ | |
1793 | struct fxsave { | |
1794 | u16 cwd; | |
1795 | u16 swd; | |
1796 | u16 twd; | |
1797 | u16 fop; | |
1798 | u64 rip; | |
1799 | u64 rdp; | |
1800 | u32 mxcsr; | |
1801 | u32 mxcsr_mask; | |
1802 | u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */ | |
1803 | #ifdef CONFIG_X86_64 | |
1804 | u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */ | |
1805 | #else | |
1806 | u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */ | |
1807 | #endif | |
1808 | }; | |
1809 | ||
1810 | int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
1811 | { | |
1812 | struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image; | |
1813 | ||
1814 | vcpu_load(vcpu); | |
1815 | ||
1816 | memcpy(fpu->fpr, fxsave->st_space, 128); | |
1817 | fpu->fcw = fxsave->cwd; | |
1818 | fpu->fsw = fxsave->swd; | |
1819 | fpu->ftwx = fxsave->twd; | |
1820 | fpu->last_opcode = fxsave->fop; | |
1821 | fpu->last_ip = fxsave->rip; | |
1822 | fpu->last_dp = fxsave->rdp; | |
1823 | memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space); | |
1824 | ||
1825 | vcpu_put(vcpu); | |
1826 | ||
1827 | return 0; | |
1828 | } | |
1829 | ||
1830 | int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
1831 | { | |
1832 | struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image; | |
1833 | ||
1834 | vcpu_load(vcpu); | |
1835 | ||
1836 | memcpy(fxsave->st_space, fpu->fpr, 128); | |
1837 | fxsave->cwd = fpu->fcw; | |
1838 | fxsave->swd = fpu->fsw; | |
1839 | fxsave->twd = fpu->ftwx; | |
1840 | fxsave->fop = fpu->last_opcode; | |
1841 | fxsave->rip = fpu->last_ip; | |
1842 | fxsave->rdp = fpu->last_dp; | |
1843 | memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space); | |
1844 | ||
1845 | vcpu_put(vcpu); | |
1846 | ||
1847 | return 0; | |
1848 | } | |
1849 | ||
1850 | void fx_init(struct kvm_vcpu *vcpu) | |
1851 | { | |
1852 | unsigned after_mxcsr_mask; | |
1853 | ||
1854 | /* Initialize guest FPU by resetting ours and saving into guest's */ | |
1855 | preempt_disable(); | |
1856 | fx_save(&vcpu->host_fx_image); | |
1857 | fpu_init(); | |
1858 | fx_save(&vcpu->guest_fx_image); | |
1859 | fx_restore(&vcpu->host_fx_image); | |
1860 | preempt_enable(); | |
1861 | ||
1862 | vcpu->cr0 |= X86_CR0_ET; | |
1863 | after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space); | |
1864 | vcpu->guest_fx_image.mxcsr = 0x1f80; | |
1865 | memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask, | |
1866 | 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask); | |
1867 | } | |
1868 | EXPORT_SYMBOL_GPL(fx_init); | |
1869 | ||
1870 | void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) | |
1871 | { | |
1872 | if (!vcpu->fpu_active || vcpu->guest_fpu_loaded) | |
1873 | return; | |
1874 | ||
1875 | vcpu->guest_fpu_loaded = 1; | |
1876 | fx_save(&vcpu->host_fx_image); | |
1877 | fx_restore(&vcpu->guest_fx_image); | |
1878 | } | |
1879 | EXPORT_SYMBOL_GPL(kvm_load_guest_fpu); | |
1880 | ||
1881 | void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) | |
1882 | { | |
1883 | if (!vcpu->guest_fpu_loaded) | |
1884 | return; | |
1885 | ||
1886 | vcpu->guest_fpu_loaded = 0; | |
1887 | fx_save(&vcpu->guest_fx_image); | |
1888 | fx_restore(&vcpu->host_fx_image); | |
1889 | } | |
1890 | EXPORT_SYMBOL_GPL(kvm_put_guest_fpu); |