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KVM: x86 emulator: modify 'lods', and 'stos' not to depend on CR2
[deliverable/linux.git] / drivers / kvm / x86.c
CommitLineData
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"
d825ed0a 19#include "x86_emulate.h"
5fb76f9b 20#include "segment_descriptor.h"
313a3dc7
CO		 21#include "irq.h"
22
23#include <linux/kvm.h>
24#include <linux/fs.h>
25#include <linux/vmalloc.h>
5fb76f9b 26#include <linux/module.h>
043405e1
CO		 27
28#include <asm/uaccess.h>
d825ed0a 29#include <asm/msr.h>
043405e1 30
313a3dc7 31#define MAX_IO_MSRS 256
a03490ed
CO		 32#define CR0_RESERVED_BITS \
33 (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
34 | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
35 | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
36#define CR4_RESERVED_BITS \
37 (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
38 | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
39 | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \
40 | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
41
42#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
15c4a640 43#define EFER_RESERVED_BITS 0xfffffffffffff2fe
313a3dc7 44
417bc304
HB		 45#define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
46
97896d04
ZX		 47struct kvm_x86_ops *kvm_x86_ops;
48
417bc304
HB		 49struct kvm_stats_debugfs_item debugfs_entries[] = {
50 { "pf_fixed", STAT_OFFSET(pf_fixed) },
51 { "pf_guest", STAT_OFFSET(pf_guest) },
52 { "tlb_flush", STAT_OFFSET(tlb_flush) },
53 { "invlpg", STAT_OFFSET(invlpg) },
54 { "exits", STAT_OFFSET(exits) },
55 { "io_exits", STAT_OFFSET(io_exits) },
56 { "mmio_exits", STAT_OFFSET(mmio_exits) },
57 { "signal_exits", STAT_OFFSET(signal_exits) },
58 { "irq_window", STAT_OFFSET(irq_window_exits) },
59 { "halt_exits", STAT_OFFSET(halt_exits) },
60 { "halt_wakeup", STAT_OFFSET(halt_wakeup) },
61 { "request_irq", STAT_OFFSET(request_irq_exits) },
62 { "irq_exits", STAT_OFFSET(irq_exits) },
63 { "light_exits", STAT_OFFSET(light_exits) },
64 { "efer_reload", STAT_OFFSET(efer_reload) },
65 { NULL }
66};
67
68
5fb76f9b
CO		 69unsigned long segment_base(u16 selector)
70{
71 struct descriptor_table gdt;
72 struct segment_descriptor *d;
73 unsigned long table_base;
74 unsigned long v;
75
76 if (selector == 0)
77 return 0;
78
79 asm("sgdt %0" : "=m"(gdt));
80 table_base = gdt.base;
81
82 if (selector & 4) { /* from ldt */
83 u16 ldt_selector;
84
85 asm("sldt %0" : "=g"(ldt_selector));
86 table_base = segment_base(ldt_selector);
87 }
88 d = (struct segment_descriptor *)(table_base + (selector & ~7));
89 v = d->base_low | ((unsigned long)d->base_mid << 16) |
90 ((unsigned long)d->base_high << 24);
91#ifdef CONFIG_X86_64
92 if (d->system == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
93 v |= ((unsigned long) \
94 ((struct segment_descriptor_64 *)d)->base_higher) << 32;
95#endif
96 return v;
97}
98EXPORT_SYMBOL_GPL(segment_base);
99
6866b83e
CO		 100u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
101{
102 if (irqchip_in_kernel(vcpu->kvm))
103 return vcpu->apic_base;
104 else
105 return vcpu->apic_base;
106}
107EXPORT_SYMBOL_GPL(kvm_get_apic_base);
108
109void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
110{
111 /* TODO: reserve bits check */
112 if (irqchip_in_kernel(vcpu->kvm))
113 kvm_lapic_set_base(vcpu, data);
114 else
115 vcpu->apic_base = data;
116}
117EXPORT_SYMBOL_GPL(kvm_set_apic_base);
118
a03490ed
CO		 119static void inject_gp(struct kvm_vcpu *vcpu)
120{
121 kvm_x86_ops->inject_gp(vcpu, 0);
122}
123
124/*
125 * Load the pae pdptrs. Return true is they are all valid.
126 */
127int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
128{
129 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
130 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
131 int i;
132 int ret;
133 u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)];
134
135 mutex_lock(&vcpu->kvm->lock);
136 ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
137 offset * sizeof(u64), sizeof(pdpte));
138 if (ret < 0) {
139 ret = 0;
140 goto out;
141 }
142 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
143 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
144 ret = 0;
145 goto out;
146 }
147 }
148 ret = 1;
149
150 memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs));
151out:
152 mutex_unlock(&vcpu->kvm->lock);
153
154 return ret;
155}
156
157void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
158{
159 if (cr0 & CR0_RESERVED_BITS) {
160 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
161 cr0, vcpu->cr0);
162 inject_gp(vcpu);
163 return;
164 }
165
166 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
167 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
168 inject_gp(vcpu);
169 return;
170 }
171
172 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
173 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
174 "and a clear PE flag\n");
175 inject_gp(vcpu);
176 return;
177 }
178
179 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
180#ifdef CONFIG_X86_64
181 if ((vcpu->shadow_efer & EFER_LME)) {
182 int cs_db, cs_l;
183
184 if (!is_pae(vcpu)) {
185 printk(KERN_DEBUG "set_cr0: #GP, start paging "
186 "in long mode while PAE is disabled\n");
187 inject_gp(vcpu);
188 return;
189 }
190 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
191 if (cs_l) {
192 printk(KERN_DEBUG "set_cr0: #GP, start paging "
193 "in long mode while CS.L == 1\n");
194 inject_gp(vcpu);
195 return;
196
197 }
198 } else
199#endif
200 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
201 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
202 "reserved bits\n");
203 inject_gp(vcpu);
204 return;
205 }
206
207 }
208
209 kvm_x86_ops->set_cr0(vcpu, cr0);
210 vcpu->cr0 = cr0;
211
212 mutex_lock(&vcpu->kvm->lock);
213 kvm_mmu_reset_context(vcpu);
214 mutex_unlock(&vcpu->kvm->lock);
215 return;
216}
217EXPORT_SYMBOL_GPL(set_cr0);
218
219void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
220{
221 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
222}
223EXPORT_SYMBOL_GPL(lmsw);
224
225void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
226{
227 if (cr4 & CR4_RESERVED_BITS) {
228 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
229 inject_gp(vcpu);
230 return;
231 }
232
233 if (is_long_mode(vcpu)) {
234 if (!(cr4 & X86_CR4_PAE)) {
235 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
236 "in long mode\n");
237 inject_gp(vcpu);
238 return;
239 }
240 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
241 && !load_pdptrs(vcpu, vcpu->cr3)) {
242 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
243 inject_gp(vcpu);
244 return;
245 }
246
247 if (cr4 & X86_CR4_VMXE) {
248 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
249 inject_gp(vcpu);
250 return;
251 }
252 kvm_x86_ops->set_cr4(vcpu, cr4);
253 vcpu->cr4 = cr4;
254 mutex_lock(&vcpu->kvm->lock);
255 kvm_mmu_reset_context(vcpu);
256 mutex_unlock(&vcpu->kvm->lock);
257}
258EXPORT_SYMBOL_GPL(set_cr4);
259
260void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
261{
262 if (is_long_mode(vcpu)) {
263 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
264 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
265 inject_gp(vcpu);
266 return;
267 }
268 } else {
269 if (is_pae(vcpu)) {
270 if (cr3 & CR3_PAE_RESERVED_BITS) {
271 printk(KERN_DEBUG
272 "set_cr3: #GP, reserved bits\n");
273 inject_gp(vcpu);
274 return;
275 }
276 if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
277 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
278 "reserved bits\n");
279 inject_gp(vcpu);
280 return;
281 }
282 }
283 /*
284 * We don't check reserved bits in nonpae mode, because
285 * this isn't enforced, and VMware depends on this.
286 */
287 }
288
289 mutex_lock(&vcpu->kvm->lock);
290 /*
291 * Does the new cr3 value map to physical memory? (Note, we
292 * catch an invalid cr3 even in real-mode, because it would
293 * cause trouble later on when we turn on paging anyway.)
294 *
295 * A real CPU would silently accept an invalid cr3 and would
296 * attempt to use it - with largely undefined (and often hard
297 * to debug) behavior on the guest side.
298 */
299 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
300 inject_gp(vcpu);
301 else {
302 vcpu->cr3 = cr3;
303 vcpu->mmu.new_cr3(vcpu);
304 }
305 mutex_unlock(&vcpu->kvm->lock);
306}
307EXPORT_SYMBOL_GPL(set_cr3);
308
309void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
310{
311 if (cr8 & CR8_RESERVED_BITS) {
312 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
313 inject_gp(vcpu);
314 return;
315 }
316 if (irqchip_in_kernel(vcpu->kvm))
317 kvm_lapic_set_tpr(vcpu, cr8);
318 else
319 vcpu->cr8 = cr8;
320}
321EXPORT_SYMBOL_GPL(set_cr8);
322
323unsigned long get_cr8(struct kvm_vcpu *vcpu)
324{
325 if (irqchip_in_kernel(vcpu->kvm))
326 return kvm_lapic_get_cr8(vcpu);
327 else
328 return vcpu->cr8;
329}
330EXPORT_SYMBOL_GPL(get_cr8);
331
043405e1
CO		 332/*
333 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
334 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
335 *
336 * This list is modified at module load time to reflect the
337 * capabilities of the host cpu.
338 */
339static u32 msrs_to_save[] = {
340 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
341 MSR_K6_STAR,
342#ifdef CONFIG_X86_64
343 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
344#endif
345 MSR_IA32_TIME_STAMP_COUNTER,
346};
347
348static unsigned num_msrs_to_save;
349
350static u32 emulated_msrs[] = {
351 MSR_IA32_MISC_ENABLE,
352};
353
15c4a640
CO		 354#ifdef CONFIG_X86_64
355
356static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
357{
358 if (efer & EFER_RESERVED_BITS) {
359 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
360 efer);
361 inject_gp(vcpu);
362 return;
363 }
364
365 if (is_paging(vcpu)
366 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
367 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
368 inject_gp(vcpu);
369 return;
370 }
371
372 kvm_x86_ops->set_efer(vcpu, efer);
373
374 efer &= ~EFER_LMA;
375 efer |= vcpu->shadow_efer & EFER_LMA;
376
377 vcpu->shadow_efer = efer;
378}
379
380#endif
381
382/*
383 * Writes msr value into into the appropriate "register".
384 * Returns 0 on success, non-0 otherwise.
385 * Assumes vcpu_load() was already called.
386 */
387int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
388{
389 return kvm_x86_ops->set_msr(vcpu, msr_index, data);
390}
391
313a3dc7
CO		 392/*
393 * Adapt set_msr() to msr_io()'s calling convention
394 */
395static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
396{
397 return kvm_set_msr(vcpu, index, *data);
398}
399
15c4a640
CO		 400
401int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
402{
403 switch (msr) {
404#ifdef CONFIG_X86_64
405 case MSR_EFER:
406 set_efer(vcpu, data);
407 break;
408#endif
409 case MSR_IA32_MC0_STATUS:
410 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
411 __FUNCTION__, data);
412 break;
413 case MSR_IA32_MCG_STATUS:
414 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
415 __FUNCTION__, data);
416 break;
417 case MSR_IA32_UCODE_REV:
418 case MSR_IA32_UCODE_WRITE:
419 case 0x200 ... 0x2ff: /* MTRRs */
420 break;
421 case MSR_IA32_APICBASE:
422 kvm_set_apic_base(vcpu, data);
423 break;
424 case MSR_IA32_MISC_ENABLE:
425 vcpu->ia32_misc_enable_msr = data;
426 break;
427 default:
428 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr);
429 return 1;
430 }
431 return 0;
432}
433EXPORT_SYMBOL_GPL(kvm_set_msr_common);
434
435
436/*
437 * Reads an msr value (of 'msr_index') into 'pdata'.
438 * Returns 0 on success, non-0 otherwise.
439 * Assumes vcpu_load() was already called.
440 */
441int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
442{
443 return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
444}
445
446int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
447{
448 u64 data;
449
450 switch (msr) {
451 case 0xc0010010: /* SYSCFG */
452 case 0xc0010015: /* HWCR */
453 case MSR_IA32_PLATFORM_ID:
454 case MSR_IA32_P5_MC_ADDR:
455 case MSR_IA32_P5_MC_TYPE:
456 case MSR_IA32_MC0_CTL:
457 case MSR_IA32_MCG_STATUS:
458 case MSR_IA32_MCG_CAP:
459 case MSR_IA32_MC0_MISC:
460 case MSR_IA32_MC0_MISC+4:
461 case MSR_IA32_MC0_MISC+8:
462 case MSR_IA32_MC0_MISC+12:
463 case MSR_IA32_MC0_MISC+16:
464 case MSR_IA32_UCODE_REV:
465 case MSR_IA32_PERF_STATUS:
466 case MSR_IA32_EBL_CR_POWERON:
467 /* MTRR registers */
468 case 0xfe:
469 case 0x200 ... 0x2ff:
470 data = 0;
471 break;
472 case 0xcd: /* fsb frequency */
473 data = 3;
474 break;
475 case MSR_IA32_APICBASE:
476 data = kvm_get_apic_base(vcpu);
477 break;
478 case MSR_IA32_MISC_ENABLE:
479 data = vcpu->ia32_misc_enable_msr;
480 break;
481#ifdef CONFIG_X86_64
482 case MSR_EFER:
483 data = vcpu->shadow_efer;
484 break;
485#endif
486 default:
487 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
488 return 1;
489 }
490 *pdata = data;
491 return 0;
492}
493EXPORT_SYMBOL_GPL(kvm_get_msr_common);
494
313a3dc7
CO		 495/*
496 * Read or write a bunch of msrs. All parameters are kernel addresses.
497 *
498 * @return number of msrs set successfully.
499 */
500static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
501 struct kvm_msr_entry *entries,
502 int (*do_msr)(struct kvm_vcpu *vcpu,
503 unsigned index, u64 *data))
504{
505 int i;
506
507 vcpu_load(vcpu);
508
509 for (i = 0; i < msrs->nmsrs; ++i)
510 if (do_msr(vcpu, entries[i].index, &entries[i].data))
511 break;
512
513 vcpu_put(vcpu);
514
515 return i;
516}
517
518/*
519 * Read or write a bunch of msrs. Parameters are user addresses.
520 *
521 * @return number of msrs set successfully.
522 */
523static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
524 int (*do_msr)(struct kvm_vcpu *vcpu,
525 unsigned index, u64 *data),
526 int writeback)
527{
528 struct kvm_msrs msrs;
529 struct kvm_msr_entry *entries;
530 int r, n;
531 unsigned size;
532
533 r = -EFAULT;
534 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
535 goto out;
536
537 r = -E2BIG;
538 if (msrs.nmsrs >= MAX_IO_MSRS)
539 goto out;
540
541 r = -ENOMEM;
542 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
543 entries = vmalloc(size);
544 if (!entries)
545 goto out;
546
547 r = -EFAULT;
548 if (copy_from_user(entries, user_msrs->entries, size))
549 goto out_free;
550
551 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
552 if (r < 0)
553 goto out_free;
554
555 r = -EFAULT;
556 if (writeback && copy_to_user(user_msrs->entries, entries, size))
557 goto out_free;
558
559 r = n;
560
561out_free:
562 vfree(entries);
563out:
564 return r;
565}
566
e9b11c17
ZX		 567/*
568 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
569 * cached on it.
570 */
571void decache_vcpus_on_cpu(int cpu)
572{
573 struct kvm *vm;
574 struct kvm_vcpu *vcpu;
575 int i;
576
577 spin_lock(&kvm_lock);
578 list_for_each_entry(vm, &vm_list, vm_list)
579 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
580 vcpu = vm->vcpus[i];
581 if (!vcpu)
582 continue;
583 /*
584 * If the vcpu is locked, then it is running on some
585 * other cpu and therefore it is not cached on the
586 * cpu in question.
587 *
588 * If it's not locked, check the last cpu it executed
589 * on.
590 */
591 if (mutex_trylock(&vcpu->mutex)) {
592 if (vcpu->cpu == cpu) {
593 kvm_x86_ops->vcpu_decache(vcpu);
594 vcpu->cpu = -1;
595 }
596 mutex_unlock(&vcpu->mutex);
597 }
598 }
599 spin_unlock(&kvm_lock);
600}
601
043405e1
CO		 602long kvm_arch_dev_ioctl(struct file *filp,
603 unsigned int ioctl, unsigned long arg)
604{
605 void __user *argp = (void __user *)arg;
606 long r;
607
608 switch (ioctl) {
609 case KVM_GET_MSR_INDEX_LIST: {
610 struct kvm_msr_list __user *user_msr_list = argp;
611 struct kvm_msr_list msr_list;
612 unsigned n;
613
614 r = -EFAULT;
615 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
616 goto out;
617 n = msr_list.nmsrs;
618 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
619 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
620 goto out;
621 r = -E2BIG;
622 if (n < num_msrs_to_save)
623 goto out;
624 r = -EFAULT;
625 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
626 num_msrs_to_save * sizeof(u32)))
627 goto out;
628 if (copy_to_user(user_msr_list->indices
629 + num_msrs_to_save * sizeof(u32),
630 &emulated_msrs,
631 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
632 goto out;
633 r = 0;
634 break;
635 }
636 default:
637 r = -EINVAL;
638 }
639out:
640 return r;
641}
642
313a3dc7
CO		 643void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
644{
645 kvm_x86_ops->vcpu_load(vcpu, cpu);
646}
647
648void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
649{
650 kvm_x86_ops->vcpu_put(vcpu);
651}
652
653static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
654{
655 u64 efer;
656 int i;
657 struct kvm_cpuid_entry *e, *entry;
658
659 rdmsrl(MSR_EFER, efer);
660 entry = NULL;
661 for (i = 0; i < vcpu->cpuid_nent; ++i) {
662 e = &vcpu->cpuid_entries[i];
663 if (e->function == 0x80000001) {
664 entry = e;
665 break;
666 }
667 }
668 if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) {
669 entry->edx &= ~(1 << 20);
670 printk(KERN_INFO "kvm: guest NX capability removed\n");
671 }
672}
673
674static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
675 struct kvm_cpuid *cpuid,
676 struct kvm_cpuid_entry __user *entries)
677{
678 int r;
679
680 r = -E2BIG;
681 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
682 goto out;
683 r = -EFAULT;
684 if (copy_from_user(&vcpu->cpuid_entries, entries,
685 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
686 goto out;
687 vcpu->cpuid_nent = cpuid->nent;
688 cpuid_fix_nx_cap(vcpu);
689 return 0;
690
691out:
692 return r;
693}
694
695static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
696 struct kvm_lapic_state *s)
697{
698 vcpu_load(vcpu);
699 memcpy(s->regs, vcpu->apic->regs, sizeof *s);
700 vcpu_put(vcpu);
701
702 return 0;
703}
704
705static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
706 struct kvm_lapic_state *s)
707{
708 vcpu_load(vcpu);
709 memcpy(vcpu->apic->regs, s->regs, sizeof *s);
710 kvm_apic_post_state_restore(vcpu);
711 vcpu_put(vcpu);
712
713 return 0;
714}
715
716long kvm_arch_vcpu_ioctl(struct file *filp,
717 unsigned int ioctl, unsigned long arg)
718{
719 struct kvm_vcpu *vcpu = filp->private_data;
720 void __user *argp = (void __user *)arg;
721 int r;
722
723 switch (ioctl) {
724 case KVM_GET_LAPIC: {
725 struct kvm_lapic_state lapic;
726
727 memset(&lapic, 0, sizeof lapic);
728 r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic);
729 if (r)
730 goto out;
731 r = -EFAULT;
732 if (copy_to_user(argp, &lapic, sizeof lapic))
733 goto out;
734 r = 0;
735 break;
736 }
737 case KVM_SET_LAPIC: {
738 struct kvm_lapic_state lapic;
739
740 r = -EFAULT;
741 if (copy_from_user(&lapic, argp, sizeof lapic))
742 goto out;
743 r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);;
744 if (r)
745 goto out;
746 r = 0;
747 break;
748 }
749 case KVM_SET_CPUID: {
750 struct kvm_cpuid __user *cpuid_arg = argp;
751 struct kvm_cpuid cpuid;
752
753 r = -EFAULT;
754 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
755 goto out;
756 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
757 if (r)
758 goto out;
759 break;
760 }
761 case KVM_GET_MSRS:
762 r = msr_io(vcpu, argp, kvm_get_msr, 1);
763 break;
764 case KVM_SET_MSRS:
765 r = msr_io(vcpu, argp, do_set_msr, 0);
766 break;
767 default:
768 r = -EINVAL;
769 }
770out:
771 return r;
772}
773
1fe779f8
CO		 774static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
775{
776 int ret;
777
778 if (addr > (unsigned int)(-3 * PAGE_SIZE))
779 return -1;
780 ret = kvm_x86_ops->set_tss_addr(kvm, addr);
781 return ret;
782}
783
784static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
785 u32 kvm_nr_mmu_pages)
786{
787 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
788 return -EINVAL;
789
790 mutex_lock(&kvm->lock);
791
792 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
793 kvm->n_requested_mmu_pages = kvm_nr_mmu_pages;
794
795 mutex_unlock(&kvm->lock);
796 return 0;
797}
798
799static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
800{
801 return kvm->n_alloc_mmu_pages;
802}
803
804/*
805 * Set a new alias region. Aliases map a portion of physical memory into
806 * another portion. This is useful for memory windows, for example the PC
807 * VGA region.
808 */
809static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
810 struct kvm_memory_alias *alias)
811{
812 int r, n;
813 struct kvm_mem_alias *p;
814
815 r = -EINVAL;
816 /* General sanity checks */
817 if (alias->memory_size & (PAGE_SIZE - 1))
818 goto out;
819 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
820 goto out;
821 if (alias->slot >= KVM_ALIAS_SLOTS)
822 goto out;
823 if (alias->guest_phys_addr + alias->memory_size
824 < alias->guest_phys_addr)
825 goto out;
826 if (alias->target_phys_addr + alias->memory_size
827 < alias->target_phys_addr)
828 goto out;
829
830 mutex_lock(&kvm->lock);
831
832 p = &kvm->aliases[alias->slot];
833 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
834 p->npages = alias->memory_size >> PAGE_SHIFT;
835 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
836
837 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
838 if (kvm->aliases[n - 1].npages)
839 break;
840 kvm->naliases = n;
841
842 kvm_mmu_zap_all(kvm);
843
844 mutex_unlock(&kvm->lock);
845
846 return 0;
847
848out:
849 return r;
850}
851
852static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
853{
854 int r;
855
856 r = 0;
857 switch (chip->chip_id) {
858 case KVM_IRQCHIP_PIC_MASTER:
859 memcpy(&chip->chip.pic,
860 &pic_irqchip(kvm)->pics[0],
861 sizeof(struct kvm_pic_state));
862 break;
863 case KVM_IRQCHIP_PIC_SLAVE:
864 memcpy(&chip->chip.pic,
865 &pic_irqchip(kvm)->pics[1],
866 sizeof(struct kvm_pic_state));
867 break;
868 case KVM_IRQCHIP_IOAPIC:
869 memcpy(&chip->chip.ioapic,
870 ioapic_irqchip(kvm),
871 sizeof(struct kvm_ioapic_state));
872 break;
873 default:
874 r = -EINVAL;
875 break;
876 }
877 return r;
878}
879
880static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
881{
882 int r;
883
884 r = 0;
885 switch (chip->chip_id) {
886 case KVM_IRQCHIP_PIC_MASTER:
887 memcpy(&pic_irqchip(kvm)->pics[0],
888 &chip->chip.pic,
889 sizeof(struct kvm_pic_state));
890 break;
891 case KVM_IRQCHIP_PIC_SLAVE:
892 memcpy(&pic_irqchip(kvm)->pics[1],
893 &chip->chip.pic,
894 sizeof(struct kvm_pic_state));
895 break;
896 case KVM_IRQCHIP_IOAPIC:
897 memcpy(ioapic_irqchip(kvm),
898 &chip->chip.ioapic,
899 sizeof(struct kvm_ioapic_state));
900 break;
901 default:
902 r = -EINVAL;
903 break;
904 }
905 kvm_pic_update_irq(pic_irqchip(kvm));
906 return r;
907}
908
909long kvm_arch_vm_ioctl(struct file *filp,
910 unsigned int ioctl, unsigned long arg)
911{
912 struct kvm *kvm = filp->private_data;
913 void __user *argp = (void __user *)arg;
914 int r = -EINVAL;
915
916 switch (ioctl) {
917 case KVM_SET_TSS_ADDR:
918 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
919 if (r < 0)
920 goto out;
921 break;
922 case KVM_SET_MEMORY_REGION: {
923 struct kvm_memory_region kvm_mem;
924 struct kvm_userspace_memory_region kvm_userspace_mem;
925
926 r = -EFAULT;
927 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
928 goto out;
929 kvm_userspace_mem.slot = kvm_mem.slot;
930 kvm_userspace_mem.flags = kvm_mem.flags;
931 kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;
932 kvm_userspace_mem.memory_size = kvm_mem.memory_size;
933 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);
934 if (r)
935 goto out;
936 break;
937 }
938 case KVM_SET_NR_MMU_PAGES:
939 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
940 if (r)
941 goto out;
942 break;
943 case KVM_GET_NR_MMU_PAGES:
944 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
945 break;
946 case KVM_SET_MEMORY_ALIAS: {
947 struct kvm_memory_alias alias;
948
949 r = -EFAULT;
950 if (copy_from_user(&alias, argp, sizeof alias))
951 goto out;
952 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
953 if (r)
954 goto out;
955 break;
956 }
957 case KVM_CREATE_IRQCHIP:
958 r = -ENOMEM;
959 kvm->vpic = kvm_create_pic(kvm);
960 if (kvm->vpic) {
961 r = kvm_ioapic_init(kvm);
962 if (r) {
963 kfree(kvm->vpic);
964 kvm->vpic = NULL;
965 goto out;
966 }
967 } else
968 goto out;
969 break;
970 case KVM_IRQ_LINE: {
971 struct kvm_irq_level irq_event;
972
973 r = -EFAULT;
974 if (copy_from_user(&irq_event, argp, sizeof irq_event))
975 goto out;
976 if (irqchip_in_kernel(kvm)) {
977 mutex_lock(&kvm->lock);
978 if (irq_event.irq < 16)
979 kvm_pic_set_irq(pic_irqchip(kvm),
980 irq_event.irq,
981 irq_event.level);
982 kvm_ioapic_set_irq(kvm->vioapic,
983 irq_event.irq,
984 irq_event.level);
985 mutex_unlock(&kvm->lock);
986 r = 0;
987 }
988 break;
989 }
990 case KVM_GET_IRQCHIP: {
991 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
992 struct kvm_irqchip chip;
993
994 r = -EFAULT;
995 if (copy_from_user(&chip, argp, sizeof chip))
996 goto out;
997 r = -ENXIO;
998 if (!irqchip_in_kernel(kvm))
999 goto out;
1000 r = kvm_vm_ioctl_get_irqchip(kvm, &chip);
1001 if (r)
1002 goto out;
1003 r = -EFAULT;
1004 if (copy_to_user(argp, &chip, sizeof chip))
1005 goto out;
1006 r = 0;
1007 break;
1008 }
1009 case KVM_SET_IRQCHIP: {
1010 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1011 struct kvm_irqchip chip;
1012
1013 r = -EFAULT;
1014 if (copy_from_user(&chip, argp, sizeof chip))
1015 goto out;
1016 r = -ENXIO;
1017 if (!irqchip_in_kernel(kvm))
1018 goto out;
1019 r = kvm_vm_ioctl_set_irqchip(kvm, &chip);
1020 if (r)
1021 goto out;
1022 r = 0;
1023 break;
1024 }
1025 default:
1026 ;
1027 }
1028out:
1029 return r;
1030}
1031
043405e1
CO		 1032static __init void kvm_init_msr_list(void)
1033{
1034 u32 dummy[2];
1035 unsigned i, j;
1036
1037 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1038 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1039 continue;
1040 if (j < i)
1041 msrs_to_save[j] = msrs_to_save[i];
1042 j++;
1043 }
1044 num_msrs_to_save = j;
1045}
1046
bbd9b64e
CO		 1047/*
1048 * Only apic need an MMIO device hook, so shortcut now..
1049 */
1050static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
1051 gpa_t addr)
1052{
1053 struct kvm_io_device *dev;
1054
1055 if (vcpu->apic) {
1056 dev = &vcpu->apic->dev;
1057 if (dev->in_range(dev, addr))
1058 return dev;
1059 }
1060 return NULL;
1061}
1062
1063
1064static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1065 gpa_t addr)
1066{
1067 struct kvm_io_device *dev;
1068
1069 dev = vcpu_find_pervcpu_dev(vcpu, addr);
1070 if (dev == NULL)
1071 dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1072 return dev;
1073}
1074
1075int emulator_read_std(unsigned long addr,
1076 void *val,
1077 unsigned int bytes,
1078 struct kvm_vcpu *vcpu)
1079{
1080 void *data = val;
1081
1082 while (bytes) {
1083 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1084 unsigned offset = addr & (PAGE_SIZE-1);
1085 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1086 int ret;
1087
1088 if (gpa == UNMAPPED_GVA)
1089 return X86EMUL_PROPAGATE_FAULT;
1090 ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
1091 if (ret < 0)
1092 return X86EMUL_UNHANDLEABLE;
1093
1094 bytes -= tocopy;
1095 data += tocopy;
1096 addr += tocopy;
1097 }
1098
1099 return X86EMUL_CONTINUE;
1100}
1101EXPORT_SYMBOL_GPL(emulator_read_std);
1102
1103static int emulator_write_std(unsigned long addr,
1104 const void *val,
1105 unsigned int bytes,
1106 struct kvm_vcpu *vcpu)
1107{
1108 pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes);
1109 return X86EMUL_UNHANDLEABLE;
1110}
1111
1112static int emulator_read_emulated(unsigned long addr,
1113 void *val,
1114 unsigned int bytes,
1115 struct kvm_vcpu *vcpu)
1116{
1117 struct kvm_io_device *mmio_dev;
1118 gpa_t gpa;
1119
1120 if (vcpu->mmio_read_completed) {
1121 memcpy(val, vcpu->mmio_data, bytes);
1122 vcpu->mmio_read_completed = 0;
1123 return X86EMUL_CONTINUE;
1124 }
1125
1126 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1127
1128 /* For APIC access vmexit */
1129 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1130 goto mmio;
1131
1132 if (emulator_read_std(addr, val, bytes, vcpu)
1133 == X86EMUL_CONTINUE)
1134 return X86EMUL_CONTINUE;
1135 if (gpa == UNMAPPED_GVA)
1136 return X86EMUL_PROPAGATE_FAULT;
1137
1138mmio:
1139 /*
1140 * Is this MMIO handled locally?
1141 */
1142 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1143 if (mmio_dev) {
1144 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1145 return X86EMUL_CONTINUE;
1146 }
1147
1148 vcpu->mmio_needed = 1;
1149 vcpu->mmio_phys_addr = gpa;
1150 vcpu->mmio_size = bytes;
1151 vcpu->mmio_is_write = 0;
1152
1153 return X86EMUL_UNHANDLEABLE;
1154}
1155
1156static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1157 const void *val, int bytes)
1158{
1159 int ret;
1160
1161 ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
1162 if (ret < 0)
1163 return 0;
1164 kvm_mmu_pte_write(vcpu, gpa, val, bytes);
1165 return 1;
1166}
1167
1168static int emulator_write_emulated_onepage(unsigned long addr,
1169 const void *val,
1170 unsigned int bytes,
1171 struct kvm_vcpu *vcpu)
1172{
1173 struct kvm_io_device *mmio_dev;
1174 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1175
1176 if (gpa == UNMAPPED_GVA) {
1177 kvm_x86_ops->inject_page_fault(vcpu, addr, 2);
1178 return X86EMUL_PROPAGATE_FAULT;
1179 }
1180
1181 /* For APIC access vmexit */
1182 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1183 goto mmio;
1184
1185 if (emulator_write_phys(vcpu, gpa, val, bytes))
1186 return X86EMUL_CONTINUE;
1187
1188mmio:
1189 /*
1190 * Is this MMIO handled locally?
1191 */
1192 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1193 if (mmio_dev) {
1194 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1195 return X86EMUL_CONTINUE;
1196 }
1197
1198 vcpu->mmio_needed = 1;
1199 vcpu->mmio_phys_addr = gpa;
1200 vcpu->mmio_size = bytes;
1201 vcpu->mmio_is_write = 1;
1202 memcpy(vcpu->mmio_data, val, bytes);
1203
1204 return X86EMUL_CONTINUE;
1205}
1206
1207int emulator_write_emulated(unsigned long addr,
1208 const void *val,
1209 unsigned int bytes,
1210 struct kvm_vcpu *vcpu)
1211{
1212 /* Crossing a page boundary? */
1213 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1214 int rc, now;
1215
1216 now = -addr & ~PAGE_MASK;
1217 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
1218 if (rc != X86EMUL_CONTINUE)
1219 return rc;
1220 addr += now;
1221 val += now;
1222 bytes -= now;
1223 }
1224 return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
1225}
1226EXPORT_SYMBOL_GPL(emulator_write_emulated);
1227
1228static int emulator_cmpxchg_emulated(unsigned long addr,
1229 const void *old,
1230 const void *new,
1231 unsigned int bytes,
1232 struct kvm_vcpu *vcpu)
1233{
1234 static int reported;
1235
1236 if (!reported) {
1237 reported = 1;
1238 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1239 }
1240 return emulator_write_emulated(addr, new, bytes, vcpu);
1241}
1242
1243static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1244{
1245 return kvm_x86_ops->get_segment_base(vcpu, seg);
1246}
1247
1248int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1249{
1250 return X86EMUL_CONTINUE;
1251}
1252
1253int emulate_clts(struct kvm_vcpu *vcpu)
1254{
1255 kvm_x86_ops->set_cr0(vcpu, vcpu->cr0 & ~X86_CR0_TS);
1256 return X86EMUL_CONTINUE;
1257}
1258
1259int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
1260{
1261 struct kvm_vcpu *vcpu = ctxt->vcpu;
1262
1263 switch (dr) {
1264 case 0 ... 3:
1265 *dest = kvm_x86_ops->get_dr(vcpu, dr);
1266 return X86EMUL_CONTINUE;
1267 default:
1268 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
1269 return X86EMUL_UNHANDLEABLE;
1270 }
1271}
1272
1273int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1274{
1275 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1276 int exception;
1277
1278 kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1279 if (exception) {
1280 /* FIXME: better handling */
1281 return X86EMUL_UNHANDLEABLE;
1282 }
1283 return X86EMUL_CONTINUE;
1284}
1285
1286void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
1287{
1288 static int reported;
1289 u8 opcodes[4];
1290 unsigned long rip = vcpu->rip;
1291 unsigned long rip_linear;
1292
1293 rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
1294
1295 if (reported)
1296 return;
1297
1298 emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
1299
1300 printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
1301 context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1302 reported = 1;
1303}
1304EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
1305
1306struct x86_emulate_ops emulate_ops = {
1307 .read_std = emulator_read_std,
1308 .write_std = emulator_write_std,
1309 .read_emulated = emulator_read_emulated,
1310 .write_emulated = emulator_write_emulated,
1311 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1312};
1313
1314int emulate_instruction(struct kvm_vcpu *vcpu,
1315 struct kvm_run *run,
1316 unsigned long cr2,
1317 u16 error_code,
1318 int no_decode)
1319{
1320 int r;
1321
1322 vcpu->mmio_fault_cr2 = cr2;
1323 kvm_x86_ops->cache_regs(vcpu);
1324
1325 vcpu->mmio_is_write = 0;
1326 vcpu->pio.string = 0;
1327
1328 if (!no_decode) {
1329 int cs_db, cs_l;
1330 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1331
1332 vcpu->emulate_ctxt.vcpu = vcpu;
1333 vcpu->emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
1334 vcpu->emulate_ctxt.cr2 = cr2;
1335 vcpu->emulate_ctxt.mode =
1336 (vcpu->emulate_ctxt.eflags & X86_EFLAGS_VM)
1337 ? X86EMUL_MODE_REAL : cs_l
1338 ? X86EMUL_MODE_PROT64 : cs_db
1339 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1340
1341 if (vcpu->emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1342 vcpu->emulate_ctxt.cs_base = 0;
1343 vcpu->emulate_ctxt.ds_base = 0;
1344 vcpu->emulate_ctxt.es_base = 0;
1345 vcpu->emulate_ctxt.ss_base = 0;
1346 } else {
1347 vcpu->emulate_ctxt.cs_base =
1348 get_segment_base(vcpu, VCPU_SREG_CS);
1349 vcpu->emulate_ctxt.ds_base =
1350 get_segment_base(vcpu, VCPU_SREG_DS);
1351 vcpu->emulate_ctxt.es_base =
1352 get_segment_base(vcpu, VCPU_SREG_ES);
1353 vcpu->emulate_ctxt.ss_base =
1354 get_segment_base(vcpu, VCPU_SREG_SS);
1355 }
1356
1357 vcpu->emulate_ctxt.gs_base =
1358 get_segment_base(vcpu, VCPU_SREG_GS);
1359 vcpu->emulate_ctxt.fs_base =
1360 get_segment_base(vcpu, VCPU_SREG_FS);
1361
1362 r = x86_decode_insn(&vcpu->emulate_ctxt, &emulate_ops);
1363 if (r) {
1364 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1365 return EMULATE_DONE;
1366 return EMULATE_FAIL;
1367 }
1368 }
1369
1370 r = x86_emulate_insn(&vcpu->emulate_ctxt, &emulate_ops);
1371
1372 if (vcpu->pio.string)
1373 return EMULATE_DO_MMIO;
1374
1375 if ((r || vcpu->mmio_is_write) && run) {
1376 run->exit_reason = KVM_EXIT_MMIO;
1377 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1378 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1379 run->mmio.len = vcpu->mmio_size;
1380 run->mmio.is_write = vcpu->mmio_is_write;
1381 }
1382
1383 if (r) {
1384 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1385 return EMULATE_DONE;
1386 if (!vcpu->mmio_needed) {
1387 kvm_report_emulation_failure(vcpu, "mmio");
1388 return EMULATE_FAIL;
1389 }
1390 return EMULATE_DO_MMIO;
1391 }
1392
1393 kvm_x86_ops->decache_regs(vcpu);
1394 kvm_x86_ops->set_rflags(vcpu, vcpu->emulate_ctxt.eflags);
1395
1396 if (vcpu->mmio_is_write) {
1397 vcpu->mmio_needed = 0;
1398 return EMULATE_DO_MMIO;
1399 }
1400
1401 return EMULATE_DONE;
1402}
1403EXPORT_SYMBOL_GPL(emulate_instruction);
1404
de7d789a
CO		 1405static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
1406{
1407 int i;
1408
1409 for (i = 0; i < ARRAY_SIZE(vcpu->pio.guest_pages); ++i)
1410 if (vcpu->pio.guest_pages[i]) {
1411 kvm_release_page(vcpu->pio.guest_pages[i]);
1412 vcpu->pio.guest_pages[i] = NULL;
1413 }
1414}
1415
1416static int pio_copy_data(struct kvm_vcpu *vcpu)
1417{
1418 void *p = vcpu->pio_data;
1419 void *q;
1420 unsigned bytes;
1421 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1422
1423 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1424 PAGE_KERNEL);
1425 if (!q) {
1426 free_pio_guest_pages(vcpu);
1427 return -ENOMEM;
1428 }
1429 q += vcpu->pio.guest_page_offset;
1430 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1431 if (vcpu->pio.in)
1432 memcpy(q, p, bytes);
1433 else
1434 memcpy(p, q, bytes);
1435 q -= vcpu->pio.guest_page_offset;
1436 vunmap(q);
1437 free_pio_guest_pages(vcpu);
1438 return 0;
1439}
1440
1441int complete_pio(struct kvm_vcpu *vcpu)
1442{
1443 struct kvm_pio_request *io = &vcpu->pio;
1444 long delta;
1445 int r;
1446
1447 kvm_x86_ops->cache_regs(vcpu);
1448
1449 if (!io->string) {
1450 if (io->in)
1451 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
1452 io->size);
1453 } else {
1454 if (io->in) {
1455 r = pio_copy_data(vcpu);
1456 if (r) {
1457 kvm_x86_ops->cache_regs(vcpu);
1458 return r;
1459 }
1460 }
1461
1462 delta = 1;
1463 if (io->rep) {
1464 delta *= io->cur_count;
1465 /*
1466 * The size of the register should really depend on
1467 * current address size.
1468 */
1469 vcpu->regs[VCPU_REGS_RCX] -= delta;
1470 }
1471 if (io->down)
1472 delta = -delta;
1473 delta *= io->size;
1474 if (io->in)
1475 vcpu->regs[VCPU_REGS_RDI] += delta;
1476 else
1477 vcpu->regs[VCPU_REGS_RSI] += delta;
1478 }
1479
1480 kvm_x86_ops->decache_regs(vcpu);
1481
1482 io->count -= io->cur_count;
1483 io->cur_count = 0;
1484
1485 return 0;
1486}
1487
1488static void kernel_pio(struct kvm_io_device *pio_dev,
1489 struct kvm_vcpu *vcpu,
1490 void *pd)
1491{
1492 /* TODO: String I/O for in kernel device */
1493
1494 mutex_lock(&vcpu->kvm->lock);
1495 if (vcpu->pio.in)
1496 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1497 vcpu->pio.size,
1498 pd);
1499 else
1500 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1501 vcpu->pio.size,
1502 pd);
1503 mutex_unlock(&vcpu->kvm->lock);
1504}
1505
1506static void pio_string_write(struct kvm_io_device *pio_dev,
1507 struct kvm_vcpu *vcpu)
1508{
1509 struct kvm_pio_request *io = &vcpu->pio;
1510 void *pd = vcpu->pio_data;
1511 int i;
1512
1513 mutex_lock(&vcpu->kvm->lock);
1514 for (i = 0; i < io->cur_count; i++) {
1515 kvm_iodevice_write(pio_dev, io->port,
1516 io->size,
1517 pd);
1518 pd += io->size;
1519 }
1520 mutex_unlock(&vcpu->kvm->lock);
1521}
1522
1523static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
1524 gpa_t addr)
1525{
1526 return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
1527}
1528
1529int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1530 int size, unsigned port)
1531{
1532 struct kvm_io_device *pio_dev;
1533
1534 vcpu->run->exit_reason = KVM_EXIT_IO;
1535 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1536 vcpu->run->io.size = vcpu->pio.size = size;
1537 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1538 vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = 1;
1539 vcpu->run->io.port = vcpu->pio.port = port;
1540 vcpu->pio.in = in;
1541 vcpu->pio.string = 0;
1542 vcpu->pio.down = 0;
1543 vcpu->pio.guest_page_offset = 0;
1544 vcpu->pio.rep = 0;
1545
1546 kvm_x86_ops->cache_regs(vcpu);
1547 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1548 kvm_x86_ops->decache_regs(vcpu);
1549
1550 kvm_x86_ops->skip_emulated_instruction(vcpu);
1551
1552 pio_dev = vcpu_find_pio_dev(vcpu, port);
1553 if (pio_dev) {
1554 kernel_pio(pio_dev, vcpu, vcpu->pio_data);
1555 complete_pio(vcpu);
1556 return 1;
1557 }
1558 return 0;
1559}
1560EXPORT_SYMBOL_GPL(kvm_emulate_pio);
1561
1562int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1563 int size, unsigned long count, int down,
1564 gva_t address, int rep, unsigned port)
1565{
1566 unsigned now, in_page;
1567 int i, ret = 0;
1568 int nr_pages = 1;
1569 struct page *page;
1570 struct kvm_io_device *pio_dev;
1571
1572 vcpu->run->exit_reason = KVM_EXIT_IO;
1573 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1574 vcpu->run->io.size = vcpu->pio.size = size;
1575 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1576 vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = count;
1577 vcpu->run->io.port = vcpu->pio.port = port;
1578 vcpu->pio.in = in;
1579 vcpu->pio.string = 1;
1580 vcpu->pio.down = down;
1581 vcpu->pio.guest_page_offset = offset_in_page(address);
1582 vcpu->pio.rep = rep;
1583
1584 if (!count) {
1585 kvm_x86_ops->skip_emulated_instruction(vcpu);
1586 return 1;
1587 }
1588
1589 if (!down)
1590 in_page = PAGE_SIZE - offset_in_page(address);
1591 else
1592 in_page = offset_in_page(address) + size;
1593 now = min(count, (unsigned long)in_page / size);
1594 if (!now) {
1595 /*
1596 * String I/O straddles page boundary. Pin two guest pages
1597 * so that we satisfy atomicity constraints. Do just one
1598 * transaction to avoid complexity.
1599 */
1600 nr_pages = 2;
1601 now = 1;
1602 }
1603 if (down) {
1604 /*
1605 * String I/O in reverse. Yuck. Kill the guest, fix later.
1606 */
1607 pr_unimpl(vcpu, "guest string pio down\n");
1608 inject_gp(vcpu);
1609 return 1;
1610 }
1611 vcpu->run->io.count = now;
1612 vcpu->pio.cur_count = now;
1613
1614 if (vcpu->pio.cur_count == vcpu->pio.count)
1615 kvm_x86_ops->skip_emulated_instruction(vcpu);
1616
1617 for (i = 0; i < nr_pages; ++i) {
1618 mutex_lock(&vcpu->kvm->lock);
1619 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1620 vcpu->pio.guest_pages[i] = page;
1621 mutex_unlock(&vcpu->kvm->lock);
1622 if (!page) {
1623 inject_gp(vcpu);
1624 free_pio_guest_pages(vcpu);
1625 return 1;
1626 }
1627 }
1628
1629 pio_dev = vcpu_find_pio_dev(vcpu, port);
1630 if (!vcpu->pio.in) {
1631 /* string PIO write */
1632 ret = pio_copy_data(vcpu);
1633 if (ret >= 0 && pio_dev) {
1634 pio_string_write(pio_dev, vcpu);
1635 complete_pio(vcpu);
1636 if (vcpu->pio.count == 0)
1637 ret = 1;
1638 }
1639 } else if (pio_dev)
1640 pr_unimpl(vcpu, "no string pio read support yet, "
1641 "port %x size %d count %ld\n",
1642 port, size, count);
1643
1644 return ret;
1645}
1646EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
1647
f8c16bba 1648int kvm_arch_init(void *opaque)
043405e1 1649{
f8c16bba
ZX		 1650 struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
1651
043405e1 1652 kvm_init_msr_list();
f8c16bba
ZX		 1653
1654 if (kvm_x86_ops) {
1655 printk(KERN_ERR "kvm: already loaded the other module\n");
1656 return -EEXIST;
1657 }
1658
1659 if (!ops->cpu_has_kvm_support()) {
1660 printk(KERN_ERR "kvm: no hardware support\n");
1661 return -EOPNOTSUPP;
1662 }
1663 if (ops->disabled_by_bios()) {
1664 printk(KERN_ERR "kvm: disabled by bios\n");
1665 return -EOPNOTSUPP;
1666 }
1667
1668 kvm_x86_ops = ops;
1669
1670 return 0;
043405e1 1671}
8776e519 1672
f8c16bba
ZX		 1673void kvm_arch_exit(void)
1674{
1675 kvm_x86_ops = NULL;
1676 }
1677
8776e519
HB		 1678int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1679{
1680 ++vcpu->stat.halt_exits;
1681 if (irqchip_in_kernel(vcpu->kvm)) {
1682 vcpu->mp_state = VCPU_MP_STATE_HALTED;
1683 kvm_vcpu_block(vcpu);
1684 if (vcpu->mp_state != VCPU_MP_STATE_RUNNABLE)
1685 return -EINTR;
1686 return 1;
1687 } else {
1688 vcpu->run->exit_reason = KVM_EXIT_HLT;
1689 return 0;
1690 }
1691}
1692EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1693
1694int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
1695{
1696 unsigned long nr, a0, a1, a2, a3, ret;
1697
1698 kvm_x86_ops->cache_regs(vcpu);
1699
1700 nr = vcpu->regs[VCPU_REGS_RAX];
1701 a0 = vcpu->regs[VCPU_REGS_RBX];
1702 a1 = vcpu->regs[VCPU_REGS_RCX];
1703 a2 = vcpu->regs[VCPU_REGS_RDX];
1704 a3 = vcpu->regs[VCPU_REGS_RSI];
1705
1706 if (!is_long_mode(vcpu)) {
1707 nr &= 0xFFFFFFFF;
1708 a0 &= 0xFFFFFFFF;
1709 a1 &= 0xFFFFFFFF;
1710 a2 &= 0xFFFFFFFF;
1711 a3 &= 0xFFFFFFFF;
1712 }
1713
1714 switch (nr) {
1715 default:
1716 ret = -KVM_ENOSYS;
1717 break;
1718 }
1719 vcpu->regs[VCPU_REGS_RAX] = ret;
1720 kvm_x86_ops->decache_regs(vcpu);
1721 return 0;
1722}
1723EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
1724
1725int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
1726{
1727 char instruction[3];
1728 int ret = 0;
1729
1730 mutex_lock(&vcpu->kvm->lock);
1731
1732 /*
1733 * Blow out the MMU to ensure that no other VCPU has an active mapping
1734 * to ensure that the updated hypercall appears atomically across all
1735 * VCPUs.
1736 */
1737 kvm_mmu_zap_all(vcpu->kvm);
1738
1739 kvm_x86_ops->cache_regs(vcpu);
1740 kvm_x86_ops->patch_hypercall(vcpu, instruction);
1741 if (emulator_write_emulated(vcpu->rip, instruction, 3, vcpu)
1742 != X86EMUL_CONTINUE)
1743 ret = -EFAULT;
1744
1745 mutex_unlock(&vcpu->kvm->lock);
1746
1747 return ret;
1748}
1749
1750static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1751{
1752 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1753}
1754
1755void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1756{
1757 struct descriptor_table dt = { limit, base };
1758
1759 kvm_x86_ops->set_gdt(vcpu, &dt);
1760}
1761
1762void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1763{
1764 struct descriptor_table dt = { limit, base };
1765
1766 kvm_x86_ops->set_idt(vcpu, &dt);
1767}
1768
1769void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1770 unsigned long *rflags)
1771{
1772 lmsw(vcpu, msw);
1773 *rflags = kvm_x86_ops->get_rflags(vcpu);
1774}
1775
1776unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1777{
1778 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
1779 switch (cr) {
1780 case 0:
1781 return vcpu->cr0;
1782 case 2:
1783 return vcpu->cr2;
1784 case 3:
1785 return vcpu->cr3;
1786 case 4:
1787 return vcpu->cr4;
1788 default:
1789 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1790 return 0;
1791 }
1792}
1793
1794void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1795 unsigned long *rflags)
1796{
1797 switch (cr) {
1798 case 0:
1799 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1800 *rflags = kvm_x86_ops->get_rflags(vcpu);
1801 break;
1802 case 2:
1803 vcpu->cr2 = val;
1804 break;
1805 case 3:
1806 set_cr3(vcpu, val);
1807 break;
1808 case 4:
1809 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1810 break;
1811 default:
1812 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1813 }
1814}
1815
1816void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1817{
1818 int i;
1819 u32 function;
1820 struct kvm_cpuid_entry *e, *best;
1821
1822 kvm_x86_ops->cache_regs(vcpu);
1823 function = vcpu->regs[VCPU_REGS_RAX];
1824 vcpu->regs[VCPU_REGS_RAX] = 0;
1825 vcpu->regs[VCPU_REGS_RBX] = 0;
1826 vcpu->regs[VCPU_REGS_RCX] = 0;
1827 vcpu->regs[VCPU_REGS_RDX] = 0;
1828 best = NULL;
1829 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1830 e = &vcpu->cpuid_entries[i];
1831 if (e->function == function) {
1832 best = e;
1833 break;
1834 }
1835 /*
1836 * Both basic or both extended?
1837 */
1838 if (((e->function ^ function) & 0x80000000) == 0)
1839 if (!best || e->function > best->function)
1840 best = e;
1841 }
1842 if (best) {
1843 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1844 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1845 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1846 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1847 }
1848 kvm_x86_ops->decache_regs(vcpu);
1849 kvm_x86_ops->skip_emulated_instruction(vcpu);
1850}
1851EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
d0752060 1852
b6c7a5dc
HB		 1853/*
1854 * Check if userspace requested an interrupt window, and that the
1855 * interrupt window is open.
1856 *
1857 * No need to exit to userspace if we already have an interrupt queued.
1858 */
1859static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
1860 struct kvm_run *kvm_run)
1861{
1862 return (!vcpu->irq_summary &&
1863 kvm_run->request_interrupt_window &&
1864 vcpu->interrupt_window_open &&
1865 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
1866}
1867
1868static void post_kvm_run_save(struct kvm_vcpu *vcpu,
1869 struct kvm_run *kvm_run)
1870{
1871 kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
1872 kvm_run->cr8 = get_cr8(vcpu);
1873 kvm_run->apic_base = kvm_get_apic_base(vcpu);
1874 if (irqchip_in_kernel(vcpu->kvm))
1875 kvm_run->ready_for_interrupt_injection = 1;
1876 else
1877 kvm_run->ready_for_interrupt_injection =
1878 (vcpu->interrupt_window_open &&
1879 vcpu->irq_summary == 0);
1880}
1881
1882static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1883{
1884 int r;
1885
1886 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_SIPI_RECEIVED)) {
1887 pr_debug("vcpu %d received sipi with vector # %x\n",
1888 vcpu->vcpu_id, vcpu->sipi_vector);
1889 kvm_lapic_reset(vcpu);
1890 r = kvm_x86_ops->vcpu_reset(vcpu);
1891 if (r)
1892 return r;
1893 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
1894 }
1895
1896preempted:
1897 if (vcpu->guest_debug.enabled)
1898 kvm_x86_ops->guest_debug_pre(vcpu);
1899
1900again:
1901 r = kvm_mmu_reload(vcpu);
1902 if (unlikely(r))
1903 goto out;
1904
1905 kvm_inject_pending_timer_irqs(vcpu);
1906
1907 preempt_disable();
1908
1909 kvm_x86_ops->prepare_guest_switch(vcpu);
1910 kvm_load_guest_fpu(vcpu);
1911
1912 local_irq_disable();
1913
1914 if (signal_pending(current)) {
1915 local_irq_enable();
1916 preempt_enable();
1917 r = -EINTR;
1918 kvm_run->exit_reason = KVM_EXIT_INTR;
1919 ++vcpu->stat.signal_exits;
1920 goto out;
1921 }
1922
1923 if (irqchip_in_kernel(vcpu->kvm))
1924 kvm_x86_ops->inject_pending_irq(vcpu);
1925 else if (!vcpu->mmio_read_completed)
1926 kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);
1927
1928 vcpu->guest_mode = 1;
1929 kvm_guest_enter();
1930
1931 if (vcpu->requests)
1932 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
1933 kvm_x86_ops->tlb_flush(vcpu);
1934
1935 kvm_x86_ops->run(vcpu, kvm_run);
1936
1937 vcpu->guest_mode = 0;
1938 local_irq_enable();
1939
1940 ++vcpu->stat.exits;
1941
1942 /*
1943 * We must have an instruction between local_irq_enable() and
1944 * kvm_guest_exit(), so the timer interrupt isn't delayed by
1945 * the interrupt shadow. The stat.exits increment will do nicely.
1946 * But we need to prevent reordering, hence this barrier():
1947 */
1948 barrier();
1949
1950 kvm_guest_exit();
1951
1952 preempt_enable();
1953
1954 /*
1955 * Profile KVM exit RIPs:
1956 */
1957 if (unlikely(prof_on == KVM_PROFILING)) {
1958 kvm_x86_ops->cache_regs(vcpu);
1959 profile_hit(KVM_PROFILING, (void *)vcpu->rip);
1960 }
1961
1962 r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
1963
1964 if (r > 0) {
1965 if (dm_request_for_irq_injection(vcpu, kvm_run)) {
1966 r = -EINTR;
1967 kvm_run->exit_reason = KVM_EXIT_INTR;
1968 ++vcpu->stat.request_irq_exits;
1969 goto out;
1970 }
1971 if (!need_resched()) {
1972 ++vcpu->stat.light_exits;
1973 goto again;
1974 }
1975 }
1976
1977out:
1978 if (r > 0) {
1979 kvm_resched(vcpu);
1980 goto preempted;
1981 }
1982
1983 post_kvm_run_save(vcpu, kvm_run);
1984
1985 return r;
1986}
1987
1988int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1989{
1990 int r;
1991 sigset_t sigsaved;
1992
1993 vcpu_load(vcpu);
1994
1995 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_UNINITIALIZED)) {
1996 kvm_vcpu_block(vcpu);
1997 vcpu_put(vcpu);
1998 return -EAGAIN;
1999 }
2000
2001 if (vcpu->sigset_active)
2002 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
2003
2004 /* re-sync apic's tpr */
2005 if (!irqchip_in_kernel(vcpu->kvm))
2006 set_cr8(vcpu, kvm_run->cr8);
2007
2008 if (vcpu->pio.cur_count) {
2009 r = complete_pio(vcpu);
2010 if (r)
2011 goto out;
2012 }
2013#if CONFIG_HAS_IOMEM
2014 if (vcpu->mmio_needed) {
2015 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
2016 vcpu->mmio_read_completed = 1;
2017 vcpu->mmio_needed = 0;
2018 r = emulate_instruction(vcpu, kvm_run,
2019 vcpu->mmio_fault_cr2, 0, 1);
2020 if (r == EMULATE_DO_MMIO) {
2021 /*
2022 * Read-modify-write. Back to userspace.
2023 */
2024 r = 0;
2025 goto out;
2026 }
2027 }
2028#endif
2029 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
2030 kvm_x86_ops->cache_regs(vcpu);
2031 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
2032 kvm_x86_ops->decache_regs(vcpu);
2033 }
2034
2035 r = __vcpu_run(vcpu, kvm_run);
2036
2037out:
2038 if (vcpu->sigset_active)
2039 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2040
2041 vcpu_put(vcpu);
2042 return r;
2043}
2044
2045int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2046{
2047 vcpu_load(vcpu);
2048
2049 kvm_x86_ops->cache_regs(vcpu);
2050
2051 regs->rax = vcpu->regs[VCPU_REGS_RAX];
2052 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
2053 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
2054 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
2055 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
2056 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
2057 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
2058 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
2059#ifdef CONFIG_X86_64
2060 regs->r8 = vcpu->regs[VCPU_REGS_R8];
2061 regs->r9 = vcpu->regs[VCPU_REGS_R9];
2062 regs->r10 = vcpu->regs[VCPU_REGS_R10];
2063 regs->r11 = vcpu->regs[VCPU_REGS_R11];
2064 regs->r12 = vcpu->regs[VCPU_REGS_R12];
2065 regs->r13 = vcpu->regs[VCPU_REGS_R13];
2066 regs->r14 = vcpu->regs[VCPU_REGS_R14];
2067 regs->r15 = vcpu->regs[VCPU_REGS_R15];
2068#endif
2069
2070 regs->rip = vcpu->rip;
2071 regs->rflags = kvm_x86_ops->get_rflags(vcpu);
2072
2073 /*
2074 * Don't leak debug flags in case they were set for guest debugging
2075 */
2076 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
2077 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
2078
2079 vcpu_put(vcpu);
2080
2081 return 0;
2082}
2083
2084int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2085{
2086 vcpu_load(vcpu);
2087
2088 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
2089 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
2090 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
2091 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
2092 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
2093 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
2094 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
2095 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
2096#ifdef CONFIG_X86_64
2097 vcpu->regs[VCPU_REGS_R8] = regs->r8;
2098 vcpu->regs[VCPU_REGS_R9] = regs->r9;
2099 vcpu->regs[VCPU_REGS_R10] = regs->r10;
2100 vcpu->regs[VCPU_REGS_R11] = regs->r11;
2101 vcpu->regs[VCPU_REGS_R12] = regs->r12;
2102 vcpu->regs[VCPU_REGS_R13] = regs->r13;
2103 vcpu->regs[VCPU_REGS_R14] = regs->r14;
2104 vcpu->regs[VCPU_REGS_R15] = regs->r15;
2105#endif
2106
2107 vcpu->rip = regs->rip;
2108 kvm_x86_ops->set_rflags(vcpu, regs->rflags);
2109
2110 kvm_x86_ops->decache_regs(vcpu);
2111
2112 vcpu_put(vcpu);
2113
2114 return 0;
2115}
2116
2117static void get_segment(struct kvm_vcpu *vcpu,
2118 struct kvm_segment *var, int seg)
2119{
2120 return kvm_x86_ops->get_segment(vcpu, var, seg);
2121}
2122
2123void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
2124{
2125 struct kvm_segment cs;
2126
2127 get_segment(vcpu, &cs, VCPU_SREG_CS);
2128 *db = cs.db;
2129 *l = cs.l;
2130}
2131EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
2132
2133int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2134 struct kvm_sregs *sregs)
2135{
2136 struct descriptor_table dt;
2137 int pending_vec;
2138
2139 vcpu_load(vcpu);
2140
2141 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2142 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2143 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2144 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2145 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2146 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2147
2148 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2149 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2150
2151 kvm_x86_ops->get_idt(vcpu, &dt);
2152 sregs->idt.limit = dt.limit;
2153 sregs->idt.base = dt.base;
2154 kvm_x86_ops->get_gdt(vcpu, &dt);
2155 sregs->gdt.limit = dt.limit;
2156 sregs->gdt.base = dt.base;
2157
2158 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2159 sregs->cr0 = vcpu->cr0;
2160 sregs->cr2 = vcpu->cr2;
2161 sregs->cr3 = vcpu->cr3;
2162 sregs->cr4 = vcpu->cr4;
2163 sregs->cr8 = get_cr8(vcpu);
2164 sregs->efer = vcpu->shadow_efer;
2165 sregs->apic_base = kvm_get_apic_base(vcpu);
2166
2167 if (irqchip_in_kernel(vcpu->kvm)) {
2168 memset(sregs->interrupt_bitmap, 0,
2169 sizeof sregs->interrupt_bitmap);
2170 pending_vec = kvm_x86_ops->get_irq(vcpu);
2171 if (pending_vec >= 0)
2172 set_bit(pending_vec,
2173 (unsigned long *)sregs->interrupt_bitmap);
2174 } else
2175 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2176 sizeof sregs->interrupt_bitmap);
2177
2178 vcpu_put(vcpu);
2179
2180 return 0;
2181}
2182
2183static void set_segment(struct kvm_vcpu *vcpu,
2184 struct kvm_segment *var, int seg)
2185{
2186 return kvm_x86_ops->set_segment(vcpu, var, seg);
2187}
2188
2189int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2190 struct kvm_sregs *sregs)
2191{
2192 int mmu_reset_needed = 0;
2193 int i, pending_vec, max_bits;
2194 struct descriptor_table dt;
2195
2196 vcpu_load(vcpu);
2197
2198 dt.limit = sregs->idt.limit;
2199 dt.base = sregs->idt.base;
2200 kvm_x86_ops->set_idt(vcpu, &dt);
2201 dt.limit = sregs->gdt.limit;
2202 dt.base = sregs->gdt.base;
2203 kvm_x86_ops->set_gdt(vcpu, &dt);
2204
2205 vcpu->cr2 = sregs->cr2;
2206 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2207 vcpu->cr3 = sregs->cr3;
2208
2209 set_cr8(vcpu, sregs->cr8);
2210
2211 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
2212#ifdef CONFIG_X86_64
2213 kvm_x86_ops->set_efer(vcpu, sregs->efer);
2214#endif
2215 kvm_set_apic_base(vcpu, sregs->apic_base);
2216
2217 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2218
2219 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
2220 vcpu->cr0 = sregs->cr0;
2221 kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
2222
2223 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2224 kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
2225 if (!is_long_mode(vcpu) && is_pae(vcpu))
2226 load_pdptrs(vcpu, vcpu->cr3);
2227
2228 if (mmu_reset_needed)
2229 kvm_mmu_reset_context(vcpu);
2230
2231 if (!irqchip_in_kernel(vcpu->kvm)) {
2232 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2233 sizeof vcpu->irq_pending);
2234 vcpu->irq_summary = 0;
2235 for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i)
2236 if (vcpu->irq_pending[i])
2237 __set_bit(i, &vcpu->irq_summary);
2238 } else {
2239 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
2240 pending_vec = find_first_bit(
2241 (const unsigned long *)sregs->interrupt_bitmap,
2242 max_bits);
2243 /* Only pending external irq is handled here */
2244 if (pending_vec < max_bits) {
2245 kvm_x86_ops->set_irq(vcpu, pending_vec);
2246 pr_debug("Set back pending irq %d\n",
2247 pending_vec);
2248 }
2249 }
2250
2251 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2252 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2253 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2254 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2255 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2256 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2257
2258 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2259 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2260
2261 vcpu_put(vcpu);
2262
2263 return 0;
2264}
2265
2266int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2267 struct kvm_debug_guest *dbg)
2268{
2269 int r;
2270
2271 vcpu_load(vcpu);
2272
2273 r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
2274
2275 vcpu_put(vcpu);
2276
2277 return r;
2278}
2279
d0752060
HB		 2280/*
2281 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2282 * we have asm/x86/processor.h
2283 */
2284struct fxsave {
2285 u16 cwd;
2286 u16 swd;
2287 u16 twd;
2288 u16 fop;
2289 u64 rip;
2290 u64 rdp;
2291 u32 mxcsr;
2292 u32 mxcsr_mask;
2293 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2294#ifdef CONFIG_X86_64
2295 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2296#else
2297 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2298#endif
2299};
2300
2301int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2302{
2303 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2304
2305 vcpu_load(vcpu);
2306
2307 memcpy(fpu->fpr, fxsave->st_space, 128);
2308 fpu->fcw = fxsave->cwd;
2309 fpu->fsw = fxsave->swd;
2310 fpu->ftwx = fxsave->twd;
2311 fpu->last_opcode = fxsave->fop;
2312 fpu->last_ip = fxsave->rip;
2313 fpu->last_dp = fxsave->rdp;
2314 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2315
2316 vcpu_put(vcpu);
2317
2318 return 0;
2319}
2320
2321int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2322{
2323 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2324
2325 vcpu_load(vcpu);
2326
2327 memcpy(fxsave->st_space, fpu->fpr, 128);
2328 fxsave->cwd = fpu->fcw;
2329 fxsave->swd = fpu->fsw;
2330 fxsave->twd = fpu->ftwx;
2331 fxsave->fop = fpu->last_opcode;
2332 fxsave->rip = fpu->last_ip;
2333 fxsave->rdp = fpu->last_dp;
2334 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2335
2336 vcpu_put(vcpu);
2337
2338 return 0;
2339}
2340
2341void fx_init(struct kvm_vcpu *vcpu)
2342{
2343 unsigned after_mxcsr_mask;
2344
2345 /* Initialize guest FPU by resetting ours and saving into guest's */
2346 preempt_disable();
2347 fx_save(&vcpu->host_fx_image);
2348 fpu_init();
2349 fx_save(&vcpu->guest_fx_image);
2350 fx_restore(&vcpu->host_fx_image);
2351 preempt_enable();
2352
2353 vcpu->cr0 |= X86_CR0_ET;
2354 after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
2355 vcpu->guest_fx_image.mxcsr = 0x1f80;
2356 memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask,
2357 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
2358}
2359EXPORT_SYMBOL_GPL(fx_init);
2360
2361void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
2362{
2363 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
2364 return;
2365
2366 vcpu->guest_fpu_loaded = 1;
2367 fx_save(&vcpu->host_fx_image);
2368 fx_restore(&vcpu->guest_fx_image);
2369}
2370EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
2371
2372void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
2373{
2374 if (!vcpu->guest_fpu_loaded)
2375 return;
2376
2377 vcpu->guest_fpu_loaded = 0;
2378 fx_save(&vcpu->guest_fx_image);
2379 fx_restore(&vcpu->host_fx_image);
2380}
2381EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
e9b11c17
ZX		 2382
2383void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
2384{
2385 kvm_x86_ops->vcpu_free(vcpu);
2386}
2387
2388struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
2389 unsigned int id)
2390{
2391 int r;
2392 struct kvm_vcpu *vcpu = kvm_x86_ops->vcpu_create(kvm, id);
2393
2394 if (IS_ERR(vcpu)) {
2395 r = -ENOMEM;
2396 goto fail;
2397 }
2398
2399 /* We do fxsave: this must be aligned. */
2400 BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
2401
2402 vcpu_load(vcpu);
2403 r = kvm_arch_vcpu_reset(vcpu);
2404 if (r == 0)
2405 r = kvm_mmu_setup(vcpu);
2406 vcpu_put(vcpu);
2407 if (r < 0)
2408 goto free_vcpu;
2409
2410 return vcpu;
2411free_vcpu:
2412 kvm_x86_ops->vcpu_free(vcpu);
2413fail:
2414 return ERR_PTR(r);
2415}
2416
2417void kvm_arch_vcpu_destory(struct kvm_vcpu *vcpu)
2418{
2419 vcpu_load(vcpu);
2420 kvm_mmu_unload(vcpu);
2421 vcpu_put(vcpu);
2422
2423 kvm_x86_ops->vcpu_free(vcpu);
2424}
2425
2426int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
2427{
2428 return kvm_x86_ops->vcpu_reset(vcpu);
2429}
2430
2431void kvm_arch_hardware_enable(void *garbage)
2432{
2433 kvm_x86_ops->hardware_enable(garbage);
2434}
2435
2436void kvm_arch_hardware_disable(void *garbage)
2437{
2438 kvm_x86_ops->hardware_disable(garbage);
2439}
2440
2441int kvm_arch_hardware_setup(void)
2442{
2443 return kvm_x86_ops->hardware_setup();
2444}
2445
2446void kvm_arch_hardware_unsetup(void)
2447{
2448 kvm_x86_ops->hardware_unsetup();
2449}
2450
2451void kvm_arch_check_processor_compat(void *rtn)
2452{
2453 kvm_x86_ops->check_processor_compatibility(rtn);
2454}
2455
2456int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
2457{
2458 struct page *page;
2459 struct kvm *kvm;
2460 int r;
2461
2462 BUG_ON(vcpu->kvm == NULL);
2463 kvm = vcpu->kvm;
2464
2465 vcpu->mmu.root_hpa = INVALID_PAGE;
2466 if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
2467 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
2468 else
2469 vcpu->mp_state = VCPU_MP_STATE_UNINITIALIZED;
2470
2471 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2472 if (!page) {
2473 r = -ENOMEM;
2474 goto fail;
2475 }
2476 vcpu->pio_data = page_address(page);
2477
2478 r = kvm_mmu_create(vcpu);
2479 if (r < 0)
2480 goto fail_free_pio_data;
2481
2482 if (irqchip_in_kernel(kvm)) {
2483 r = kvm_create_lapic(vcpu);
2484 if (r < 0)
2485 goto fail_mmu_destroy;
2486 }
2487
2488 return 0;
2489
2490fail_mmu_destroy:
2491 kvm_mmu_destroy(vcpu);
2492fail_free_pio_data:
2493 free_page((unsigned long)vcpu->pio_data);
2494fail:
2495 return r;
2496}
2497
2498void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
2499{
2500 kvm_free_lapic(vcpu);
2501 kvm_mmu_destroy(vcpu);
2502 free_page((unsigned long)vcpu->pio_data);
2503}
Linux kernel - Deliverables
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