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KVM: Portability: Combine kvm_init and kvm_init_x86
[mirror_ubuntu-bionic-kernel.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
043405e1
CO		 1648__init void kvm_arch_init(void)
1649{
1650 kvm_init_msr_list();
1651}
8776e519
HB		 1652
1653int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1654{
1655 ++vcpu->stat.halt_exits;
1656 if (irqchip_in_kernel(vcpu->kvm)) {
1657 vcpu->mp_state = VCPU_MP_STATE_HALTED;
1658 kvm_vcpu_block(vcpu);
1659 if (vcpu->mp_state != VCPU_MP_STATE_RUNNABLE)
1660 return -EINTR;
1661 return 1;
1662 } else {
1663 vcpu->run->exit_reason = KVM_EXIT_HLT;
1664 return 0;
1665 }
1666}
1667EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1668
1669int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
1670{
1671 unsigned long nr, a0, a1, a2, a3, ret;
1672
1673 kvm_x86_ops->cache_regs(vcpu);
1674
1675 nr = vcpu->regs[VCPU_REGS_RAX];
1676 a0 = vcpu->regs[VCPU_REGS_RBX];
1677 a1 = vcpu->regs[VCPU_REGS_RCX];
1678 a2 = vcpu->regs[VCPU_REGS_RDX];
1679 a3 = vcpu->regs[VCPU_REGS_RSI];
1680
1681 if (!is_long_mode(vcpu)) {
1682 nr &= 0xFFFFFFFF;
1683 a0 &= 0xFFFFFFFF;
1684 a1 &= 0xFFFFFFFF;
1685 a2 &= 0xFFFFFFFF;
1686 a3 &= 0xFFFFFFFF;
1687 }
1688
1689 switch (nr) {
1690 default:
1691 ret = -KVM_ENOSYS;
1692 break;
1693 }
1694 vcpu->regs[VCPU_REGS_RAX] = ret;
1695 kvm_x86_ops->decache_regs(vcpu);
1696 return 0;
1697}
1698EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
1699
1700int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
1701{
1702 char instruction[3];
1703 int ret = 0;
1704
1705 mutex_lock(&vcpu->kvm->lock);
1706
1707 /*
1708 * Blow out the MMU to ensure that no other VCPU has an active mapping
1709 * to ensure that the updated hypercall appears atomically across all
1710 * VCPUs.
1711 */
1712 kvm_mmu_zap_all(vcpu->kvm);
1713
1714 kvm_x86_ops->cache_regs(vcpu);
1715 kvm_x86_ops->patch_hypercall(vcpu, instruction);
1716 if (emulator_write_emulated(vcpu->rip, instruction, 3, vcpu)
1717 != X86EMUL_CONTINUE)
1718 ret = -EFAULT;
1719
1720 mutex_unlock(&vcpu->kvm->lock);
1721
1722 return ret;
1723}
1724
1725static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1726{
1727 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1728}
1729
1730void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1731{
1732 struct descriptor_table dt = { limit, base };
1733
1734 kvm_x86_ops->set_gdt(vcpu, &dt);
1735}
1736
1737void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1738{
1739 struct descriptor_table dt = { limit, base };
1740
1741 kvm_x86_ops->set_idt(vcpu, &dt);
1742}
1743
1744void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1745 unsigned long *rflags)
1746{
1747 lmsw(vcpu, msw);
1748 *rflags = kvm_x86_ops->get_rflags(vcpu);
1749}
1750
1751unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1752{
1753 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
1754 switch (cr) {
1755 case 0:
1756 return vcpu->cr0;
1757 case 2:
1758 return vcpu->cr2;
1759 case 3:
1760 return vcpu->cr3;
1761 case 4:
1762 return vcpu->cr4;
1763 default:
1764 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1765 return 0;
1766 }
1767}
1768
1769void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1770 unsigned long *rflags)
1771{
1772 switch (cr) {
1773 case 0:
1774 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1775 *rflags = kvm_x86_ops->get_rflags(vcpu);
1776 break;
1777 case 2:
1778 vcpu->cr2 = val;
1779 break;
1780 case 3:
1781 set_cr3(vcpu, val);
1782 break;
1783 case 4:
1784 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1785 break;
1786 default:
1787 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1788 }
1789}
1790
1791void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1792{
1793 int i;
1794 u32 function;
1795 struct kvm_cpuid_entry *e, *best;
1796
1797 kvm_x86_ops->cache_regs(vcpu);
1798 function = vcpu->regs[VCPU_REGS_RAX];
1799 vcpu->regs[VCPU_REGS_RAX] = 0;
1800 vcpu->regs[VCPU_REGS_RBX] = 0;
1801 vcpu->regs[VCPU_REGS_RCX] = 0;
1802 vcpu->regs[VCPU_REGS_RDX] = 0;
1803 best = NULL;
1804 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1805 e = &vcpu->cpuid_entries[i];
1806 if (e->function == function) {
1807 best = e;
1808 break;
1809 }
1810 /*
1811 * Both basic or both extended?
1812 */
1813 if (((e->function ^ function) & 0x80000000) == 0)
1814 if (!best || e->function > best->function)
1815 best = e;
1816 }
1817 if (best) {
1818 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1819 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1820 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1821 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1822 }
1823 kvm_x86_ops->decache_regs(vcpu);
1824 kvm_x86_ops->skip_emulated_instruction(vcpu);
1825}
1826EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
d0752060 1827
b6c7a5dc
HB		 1828/*
1829 * Check if userspace requested an interrupt window, and that the
1830 * interrupt window is open.
1831 *
1832 * No need to exit to userspace if we already have an interrupt queued.
1833 */
1834static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
1835 struct kvm_run *kvm_run)
1836{
1837 return (!vcpu->irq_summary &&
1838 kvm_run->request_interrupt_window &&
1839 vcpu->interrupt_window_open &&
1840 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
1841}
1842
1843static void post_kvm_run_save(struct kvm_vcpu *vcpu,
1844 struct kvm_run *kvm_run)
1845{
1846 kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
1847 kvm_run->cr8 = get_cr8(vcpu);
1848 kvm_run->apic_base = kvm_get_apic_base(vcpu);
1849 if (irqchip_in_kernel(vcpu->kvm))
1850 kvm_run->ready_for_interrupt_injection = 1;
1851 else
1852 kvm_run->ready_for_interrupt_injection =
1853 (vcpu->interrupt_window_open &&
1854 vcpu->irq_summary == 0);
1855}
1856
1857static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1858{
1859 int r;
1860
1861 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_SIPI_RECEIVED)) {
1862 pr_debug("vcpu %d received sipi with vector # %x\n",
1863 vcpu->vcpu_id, vcpu->sipi_vector);
1864 kvm_lapic_reset(vcpu);
1865 r = kvm_x86_ops->vcpu_reset(vcpu);
1866 if (r)
1867 return r;
1868 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
1869 }
1870
1871preempted:
1872 if (vcpu->guest_debug.enabled)
1873 kvm_x86_ops->guest_debug_pre(vcpu);
1874
1875again:
1876 r = kvm_mmu_reload(vcpu);
1877 if (unlikely(r))
1878 goto out;
1879
1880 kvm_inject_pending_timer_irqs(vcpu);
1881
1882 preempt_disable();
1883
1884 kvm_x86_ops->prepare_guest_switch(vcpu);
1885 kvm_load_guest_fpu(vcpu);
1886
1887 local_irq_disable();
1888
1889 if (signal_pending(current)) {
1890 local_irq_enable();
1891 preempt_enable();
1892 r = -EINTR;
1893 kvm_run->exit_reason = KVM_EXIT_INTR;
1894 ++vcpu->stat.signal_exits;
1895 goto out;
1896 }
1897
1898 if (irqchip_in_kernel(vcpu->kvm))
1899 kvm_x86_ops->inject_pending_irq(vcpu);
1900 else if (!vcpu->mmio_read_completed)
1901 kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);
1902
1903 vcpu->guest_mode = 1;
1904 kvm_guest_enter();
1905
1906 if (vcpu->requests)
1907 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
1908 kvm_x86_ops->tlb_flush(vcpu);
1909
1910 kvm_x86_ops->run(vcpu, kvm_run);
1911
1912 vcpu->guest_mode = 0;
1913 local_irq_enable();
1914
1915 ++vcpu->stat.exits;
1916
1917 /*
1918 * We must have an instruction between local_irq_enable() and
1919 * kvm_guest_exit(), so the timer interrupt isn't delayed by
1920 * the interrupt shadow. The stat.exits increment will do nicely.
1921 * But we need to prevent reordering, hence this barrier():
1922 */
1923 barrier();
1924
1925 kvm_guest_exit();
1926
1927 preempt_enable();
1928
1929 /*
1930 * Profile KVM exit RIPs:
1931 */
1932 if (unlikely(prof_on == KVM_PROFILING)) {
1933 kvm_x86_ops->cache_regs(vcpu);
1934 profile_hit(KVM_PROFILING, (void *)vcpu->rip);
1935 }
1936
1937 r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
1938
1939 if (r > 0) {
1940 if (dm_request_for_irq_injection(vcpu, kvm_run)) {
1941 r = -EINTR;
1942 kvm_run->exit_reason = KVM_EXIT_INTR;
1943 ++vcpu->stat.request_irq_exits;
1944 goto out;
1945 }
1946 if (!need_resched()) {
1947 ++vcpu->stat.light_exits;
1948 goto again;
1949 }
1950 }
1951
1952out:
1953 if (r > 0) {
1954 kvm_resched(vcpu);
1955 goto preempted;
1956 }
1957
1958 post_kvm_run_save(vcpu, kvm_run);
1959
1960 return r;
1961}
1962
1963int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1964{
1965 int r;
1966 sigset_t sigsaved;
1967
1968 vcpu_load(vcpu);
1969
1970 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_UNINITIALIZED)) {
1971 kvm_vcpu_block(vcpu);
1972 vcpu_put(vcpu);
1973 return -EAGAIN;
1974 }
1975
1976 if (vcpu->sigset_active)
1977 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
1978
1979 /* re-sync apic's tpr */
1980 if (!irqchip_in_kernel(vcpu->kvm))
1981 set_cr8(vcpu, kvm_run->cr8);
1982
1983 if (vcpu->pio.cur_count) {
1984 r = complete_pio(vcpu);
1985 if (r)
1986 goto out;
1987 }
1988#if CONFIG_HAS_IOMEM
1989 if (vcpu->mmio_needed) {
1990 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1991 vcpu->mmio_read_completed = 1;
1992 vcpu->mmio_needed = 0;
1993 r = emulate_instruction(vcpu, kvm_run,
1994 vcpu->mmio_fault_cr2, 0, 1);
1995 if (r == EMULATE_DO_MMIO) {
1996 /*
1997 * Read-modify-write. Back to userspace.
1998 */
1999 r = 0;
2000 goto out;
2001 }
2002 }
2003#endif
2004 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
2005 kvm_x86_ops->cache_regs(vcpu);
2006 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
2007 kvm_x86_ops->decache_regs(vcpu);
2008 }
2009
2010 r = __vcpu_run(vcpu, kvm_run);
2011
2012out:
2013 if (vcpu->sigset_active)
2014 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2015
2016 vcpu_put(vcpu);
2017 return r;
2018}
2019
2020int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2021{
2022 vcpu_load(vcpu);
2023
2024 kvm_x86_ops->cache_regs(vcpu);
2025
2026 regs->rax = vcpu->regs[VCPU_REGS_RAX];
2027 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
2028 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
2029 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
2030 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
2031 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
2032 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
2033 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
2034#ifdef CONFIG_X86_64
2035 regs->r8 = vcpu->regs[VCPU_REGS_R8];
2036 regs->r9 = vcpu->regs[VCPU_REGS_R9];
2037 regs->r10 = vcpu->regs[VCPU_REGS_R10];
2038 regs->r11 = vcpu->regs[VCPU_REGS_R11];
2039 regs->r12 = vcpu->regs[VCPU_REGS_R12];
2040 regs->r13 = vcpu->regs[VCPU_REGS_R13];
2041 regs->r14 = vcpu->regs[VCPU_REGS_R14];
2042 regs->r15 = vcpu->regs[VCPU_REGS_R15];
2043#endif
2044
2045 regs->rip = vcpu->rip;
2046 regs->rflags = kvm_x86_ops->get_rflags(vcpu);
2047
2048 /*
2049 * Don't leak debug flags in case they were set for guest debugging
2050 */
2051 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
2052 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
2053
2054 vcpu_put(vcpu);
2055
2056 return 0;
2057}
2058
2059int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2060{
2061 vcpu_load(vcpu);
2062
2063 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
2064 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
2065 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
2066 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
2067 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
2068 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
2069 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
2070 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
2071#ifdef CONFIG_X86_64
2072 vcpu->regs[VCPU_REGS_R8] = regs->r8;
2073 vcpu->regs[VCPU_REGS_R9] = regs->r9;
2074 vcpu->regs[VCPU_REGS_R10] = regs->r10;
2075 vcpu->regs[VCPU_REGS_R11] = regs->r11;
2076 vcpu->regs[VCPU_REGS_R12] = regs->r12;
2077 vcpu->regs[VCPU_REGS_R13] = regs->r13;
2078 vcpu->regs[VCPU_REGS_R14] = regs->r14;
2079 vcpu->regs[VCPU_REGS_R15] = regs->r15;
2080#endif
2081
2082 vcpu->rip = regs->rip;
2083 kvm_x86_ops->set_rflags(vcpu, regs->rflags);
2084
2085 kvm_x86_ops->decache_regs(vcpu);
2086
2087 vcpu_put(vcpu);
2088
2089 return 0;
2090}
2091
2092static void get_segment(struct kvm_vcpu *vcpu,
2093 struct kvm_segment *var, int seg)
2094{
2095 return kvm_x86_ops->get_segment(vcpu, var, seg);
2096}
2097
2098void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
2099{
2100 struct kvm_segment cs;
2101
2102 get_segment(vcpu, &cs, VCPU_SREG_CS);
2103 *db = cs.db;
2104 *l = cs.l;
2105}
2106EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
2107
2108int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2109 struct kvm_sregs *sregs)
2110{
2111 struct descriptor_table dt;
2112 int pending_vec;
2113
2114 vcpu_load(vcpu);
2115
2116 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2117 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2118 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2119 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2120 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2121 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2122
2123 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2124 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2125
2126 kvm_x86_ops->get_idt(vcpu, &dt);
2127 sregs->idt.limit = dt.limit;
2128 sregs->idt.base = dt.base;
2129 kvm_x86_ops->get_gdt(vcpu, &dt);
2130 sregs->gdt.limit = dt.limit;
2131 sregs->gdt.base = dt.base;
2132
2133 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2134 sregs->cr0 = vcpu->cr0;
2135 sregs->cr2 = vcpu->cr2;
2136 sregs->cr3 = vcpu->cr3;
2137 sregs->cr4 = vcpu->cr4;
2138 sregs->cr8 = get_cr8(vcpu);
2139 sregs->efer = vcpu->shadow_efer;
2140 sregs->apic_base = kvm_get_apic_base(vcpu);
2141
2142 if (irqchip_in_kernel(vcpu->kvm)) {
2143 memset(sregs->interrupt_bitmap, 0,
2144 sizeof sregs->interrupt_bitmap);
2145 pending_vec = kvm_x86_ops->get_irq(vcpu);
2146 if (pending_vec >= 0)
2147 set_bit(pending_vec,
2148 (unsigned long *)sregs->interrupt_bitmap);
2149 } else
2150 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2151 sizeof sregs->interrupt_bitmap);
2152
2153 vcpu_put(vcpu);
2154
2155 return 0;
2156}
2157
2158static void set_segment(struct kvm_vcpu *vcpu,
2159 struct kvm_segment *var, int seg)
2160{
2161 return kvm_x86_ops->set_segment(vcpu, var, seg);
2162}
2163
2164int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2165 struct kvm_sregs *sregs)
2166{
2167 int mmu_reset_needed = 0;
2168 int i, pending_vec, max_bits;
2169 struct descriptor_table dt;
2170
2171 vcpu_load(vcpu);
2172
2173 dt.limit = sregs->idt.limit;
2174 dt.base = sregs->idt.base;
2175 kvm_x86_ops->set_idt(vcpu, &dt);
2176 dt.limit = sregs->gdt.limit;
2177 dt.base = sregs->gdt.base;
2178 kvm_x86_ops->set_gdt(vcpu, &dt);
2179
2180 vcpu->cr2 = sregs->cr2;
2181 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2182 vcpu->cr3 = sregs->cr3;
2183
2184 set_cr8(vcpu, sregs->cr8);
2185
2186 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
2187#ifdef CONFIG_X86_64
2188 kvm_x86_ops->set_efer(vcpu, sregs->efer);
2189#endif
2190 kvm_set_apic_base(vcpu, sregs->apic_base);
2191
2192 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2193
2194 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
2195 vcpu->cr0 = sregs->cr0;
2196 kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
2197
2198 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2199 kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
2200 if (!is_long_mode(vcpu) && is_pae(vcpu))
2201 load_pdptrs(vcpu, vcpu->cr3);
2202
2203 if (mmu_reset_needed)
2204 kvm_mmu_reset_context(vcpu);
2205
2206 if (!irqchip_in_kernel(vcpu->kvm)) {
2207 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2208 sizeof vcpu->irq_pending);
2209 vcpu->irq_summary = 0;
2210 for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i)
2211 if (vcpu->irq_pending[i])
2212 __set_bit(i, &vcpu->irq_summary);
2213 } else {
2214 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
2215 pending_vec = find_first_bit(
2216 (const unsigned long *)sregs->interrupt_bitmap,
2217 max_bits);
2218 /* Only pending external irq is handled here */
2219 if (pending_vec < max_bits) {
2220 kvm_x86_ops->set_irq(vcpu, pending_vec);
2221 pr_debug("Set back pending irq %d\n",
2222 pending_vec);
2223 }
2224 }
2225
2226 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2227 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2228 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2229 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2230 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2231 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2232
2233 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2234 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2235
2236 vcpu_put(vcpu);
2237
2238 return 0;
2239}
2240
2241int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2242 struct kvm_debug_guest *dbg)
2243{
2244 int r;
2245
2246 vcpu_load(vcpu);
2247
2248 r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
2249
2250 vcpu_put(vcpu);
2251
2252 return r;
2253}
2254
d0752060
HB		 2255/*
2256 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2257 * we have asm/x86/processor.h
2258 */
2259struct fxsave {
2260 u16 cwd;
2261 u16 swd;
2262 u16 twd;
2263 u16 fop;
2264 u64 rip;
2265 u64 rdp;
2266 u32 mxcsr;
2267 u32 mxcsr_mask;
2268 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2269#ifdef CONFIG_X86_64
2270 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2271#else
2272 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2273#endif
2274};
2275
2276int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2277{
2278 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2279
2280 vcpu_load(vcpu);
2281
2282 memcpy(fpu->fpr, fxsave->st_space, 128);
2283 fpu->fcw = fxsave->cwd;
2284 fpu->fsw = fxsave->swd;
2285 fpu->ftwx = fxsave->twd;
2286 fpu->last_opcode = fxsave->fop;
2287 fpu->last_ip = fxsave->rip;
2288 fpu->last_dp = fxsave->rdp;
2289 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2290
2291 vcpu_put(vcpu);
2292
2293 return 0;
2294}
2295
2296int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2297{
2298 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2299
2300 vcpu_load(vcpu);
2301
2302 memcpy(fxsave->st_space, fpu->fpr, 128);
2303 fxsave->cwd = fpu->fcw;
2304 fxsave->swd = fpu->fsw;
2305 fxsave->twd = fpu->ftwx;
2306 fxsave->fop = fpu->last_opcode;
2307 fxsave->rip = fpu->last_ip;
2308 fxsave->rdp = fpu->last_dp;
2309 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2310
2311 vcpu_put(vcpu);
2312
2313 return 0;
2314}
2315
2316void fx_init(struct kvm_vcpu *vcpu)
2317{
2318 unsigned after_mxcsr_mask;
2319
2320 /* Initialize guest FPU by resetting ours and saving into guest's */
2321 preempt_disable();
2322 fx_save(&vcpu->host_fx_image);
2323 fpu_init();
2324 fx_save(&vcpu->guest_fx_image);
2325 fx_restore(&vcpu->host_fx_image);
2326 preempt_enable();
2327
2328 vcpu->cr0 |= X86_CR0_ET;
2329 after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
2330 vcpu->guest_fx_image.mxcsr = 0x1f80;
2331 memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask,
2332 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
2333}
2334EXPORT_SYMBOL_GPL(fx_init);
2335
2336void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
2337{
2338 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
2339 return;
2340
2341 vcpu->guest_fpu_loaded = 1;
2342 fx_save(&vcpu->host_fx_image);
2343 fx_restore(&vcpu->guest_fx_image);
2344}
2345EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
2346
2347void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
2348{
2349 if (!vcpu->guest_fpu_loaded)
2350 return;
2351
2352 vcpu->guest_fpu_loaded = 0;
2353 fx_save(&vcpu->guest_fx_image);
2354 fx_restore(&vcpu->host_fx_image);
2355}
2356EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
e9b11c17
ZX		 2357
2358void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
2359{
2360 kvm_x86_ops->vcpu_free(vcpu);
2361}
2362
2363struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
2364 unsigned int id)
2365{
2366 int r;
2367 struct kvm_vcpu *vcpu = kvm_x86_ops->vcpu_create(kvm, id);
2368
2369 if (IS_ERR(vcpu)) {
2370 r = -ENOMEM;
2371 goto fail;
2372 }
2373
2374 /* We do fxsave: this must be aligned. */
2375 BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
2376
2377 vcpu_load(vcpu);
2378 r = kvm_arch_vcpu_reset(vcpu);
2379 if (r == 0)
2380 r = kvm_mmu_setup(vcpu);
2381 vcpu_put(vcpu);
2382 if (r < 0)
2383 goto free_vcpu;
2384
2385 return vcpu;
2386free_vcpu:
2387 kvm_x86_ops->vcpu_free(vcpu);
2388fail:
2389 return ERR_PTR(r);
2390}
2391
2392void kvm_arch_vcpu_destory(struct kvm_vcpu *vcpu)
2393{
2394 vcpu_load(vcpu);
2395 kvm_mmu_unload(vcpu);
2396 vcpu_put(vcpu);
2397
2398 kvm_x86_ops->vcpu_free(vcpu);
2399}
2400
2401int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
2402{
2403 return kvm_x86_ops->vcpu_reset(vcpu);
2404}
2405
2406void kvm_arch_hardware_enable(void *garbage)
2407{
2408 kvm_x86_ops->hardware_enable(garbage);
2409}
2410
2411void kvm_arch_hardware_disable(void *garbage)
2412{
2413 kvm_x86_ops->hardware_disable(garbage);
2414}
2415
2416int kvm_arch_hardware_setup(void)
2417{
2418 return kvm_x86_ops->hardware_setup();
2419}
2420
2421void kvm_arch_hardware_unsetup(void)
2422{
2423 kvm_x86_ops->hardware_unsetup();
2424}
2425
2426void kvm_arch_check_processor_compat(void *rtn)
2427{
2428 kvm_x86_ops->check_processor_compatibility(rtn);
2429}
2430
2431int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
2432{
2433 struct page *page;
2434 struct kvm *kvm;
2435 int r;
2436
2437 BUG_ON(vcpu->kvm == NULL);
2438 kvm = vcpu->kvm;
2439
2440 vcpu->mmu.root_hpa = INVALID_PAGE;
2441 if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
2442 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
2443 else
2444 vcpu->mp_state = VCPU_MP_STATE_UNINITIALIZED;
2445
2446 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2447 if (!page) {
2448 r = -ENOMEM;
2449 goto fail;
2450 }
2451 vcpu->pio_data = page_address(page);
2452
2453 r = kvm_mmu_create(vcpu);
2454 if (r < 0)
2455 goto fail_free_pio_data;
2456
2457 if (irqchip_in_kernel(kvm)) {
2458 r = kvm_create_lapic(vcpu);
2459 if (r < 0)
2460 goto fail_mmu_destroy;
2461 }
2462
2463 return 0;
2464
2465fail_mmu_destroy:
2466 kvm_mmu_destroy(vcpu);
2467fail_free_pio_data:
2468 free_page((unsigned long)vcpu->pio_data);
2469fail:
2470 return r;
2471}
2472
2473void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
2474{
2475 kvm_free_lapic(vcpu);
2476 kvm_mmu_destroy(vcpu);
2477 free_page((unsigned long)vcpu->pio_data);
2478}
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