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KVM: MMU: Avoid unnecessary remote tlb flushes when guest updates a pte
[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>
0de10343 27#include <linux/mman.h>
043405e1
CO		 28
29#include <asm/uaccess.h>
d825ed0a 30#include <asm/msr.h>
043405e1 31
313a3dc7 32#define MAX_IO_MSRS 256
a03490ed
CO		 33#define CR0_RESERVED_BITS \
34 (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
35 | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
36 | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
37#define CR4_RESERVED_BITS \
38 (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
39 | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
40 | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \
41 | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
42
43#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
15c4a640 44#define EFER_RESERVED_BITS 0xfffffffffffff2fe
313a3dc7 45
ba1389b7
AK		 46#define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
47#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
417bc304 48
97896d04
ZX		 49struct kvm_x86_ops *kvm_x86_ops;
50
417bc304 51struct kvm_stats_debugfs_item debugfs_entries[] = {
ba1389b7
AK		 52 { "pf_fixed", VCPU_STAT(pf_fixed) },
53 { "pf_guest", VCPU_STAT(pf_guest) },
54 { "tlb_flush", VCPU_STAT(tlb_flush) },
55 { "invlpg", VCPU_STAT(invlpg) },
56 { "exits", VCPU_STAT(exits) },
57 { "io_exits", VCPU_STAT(io_exits) },
58 { "mmio_exits", VCPU_STAT(mmio_exits) },
59 { "signal_exits", VCPU_STAT(signal_exits) },
60 { "irq_window", VCPU_STAT(irq_window_exits) },
61 { "halt_exits", VCPU_STAT(halt_exits) },
62 { "halt_wakeup", VCPU_STAT(halt_wakeup) },
63 { "request_irq", VCPU_STAT(request_irq_exits) },
64 { "irq_exits", VCPU_STAT(irq_exits) },
65 { "host_state_reload", VCPU_STAT(host_state_reload) },
66 { "efer_reload", VCPU_STAT(efer_reload) },
67 { "fpu_reload", VCPU_STAT(fpu_reload) },
68 { "insn_emulation", VCPU_STAT(insn_emulation) },
69 { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
4cee5764
AK		 70 { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
71 { "mmu_pte_write", VM_STAT(mmu_pte_write) },
72 { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
73 { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
74 { "mmu_flooded", VM_STAT(mmu_flooded) },
75 { "mmu_recycled", VM_STAT(mmu_recycled) },
0f74a24c 76 { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
417bc304
HB		 77 { NULL }
78};
79
80
5fb76f9b
CO		 81unsigned long segment_base(u16 selector)
82{
83 struct descriptor_table gdt;
84 struct segment_descriptor *d;
85 unsigned long table_base;
86 unsigned long v;
87
88 if (selector == 0)
89 return 0;
90
91 asm("sgdt %0" : "=m"(gdt));
92 table_base = gdt.base;
93
94 if (selector & 4) { /* from ldt */
95 u16 ldt_selector;
96
97 asm("sldt %0" : "=g"(ldt_selector));
98 table_base = segment_base(ldt_selector);
99 }
100 d = (struct segment_descriptor *)(table_base + (selector & ~7));
101 v = d->base_low | ((unsigned long)d->base_mid << 16) |
102 ((unsigned long)d->base_high << 24);
103#ifdef CONFIG_X86_64
104 if (d->system == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
105 v |= ((unsigned long) \
106 ((struct segment_descriptor_64 *)d)->base_higher) << 32;
107#endif
108 return v;
109}
110EXPORT_SYMBOL_GPL(segment_base);
111
6866b83e
CO		 112u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
113{
114 if (irqchip_in_kernel(vcpu->kvm))
115 return vcpu->apic_base;
116 else
117 return vcpu->apic_base;
118}
119EXPORT_SYMBOL_GPL(kvm_get_apic_base);
120
121void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
122{
123 /* TODO: reserve bits check */
124 if (irqchip_in_kernel(vcpu->kvm))
125 kvm_lapic_set_base(vcpu, data);
126 else
127 vcpu->apic_base = data;
128}
129EXPORT_SYMBOL_GPL(kvm_set_apic_base);
130
a03490ed
CO		 131static void inject_gp(struct kvm_vcpu *vcpu)
132{
133 kvm_x86_ops->inject_gp(vcpu, 0);
134}
135
136/*
137 * Load the pae pdptrs. Return true is they are all valid.
138 */
139int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
140{
141 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
142 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
143 int i;
144 int ret;
145 u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)];
146
147 mutex_lock(&vcpu->kvm->lock);
148 ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
149 offset * sizeof(u64), sizeof(pdpte));
150 if (ret < 0) {
151 ret = 0;
152 goto out;
153 }
154 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
155 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
156 ret = 0;
157 goto out;
158 }
159 }
160 ret = 1;
161
162 memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs));
163out:
164 mutex_unlock(&vcpu->kvm->lock);
165
166 return ret;
167}
168
169void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
170{
171 if (cr0 & CR0_RESERVED_BITS) {
172 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
173 cr0, vcpu->cr0);
174 inject_gp(vcpu);
175 return;
176 }
177
178 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
179 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
180 inject_gp(vcpu);
181 return;
182 }
183
184 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
185 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
186 "and a clear PE flag\n");
187 inject_gp(vcpu);
188 return;
189 }
190
191 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
192#ifdef CONFIG_X86_64
193 if ((vcpu->shadow_efer & EFER_LME)) {
194 int cs_db, cs_l;
195
196 if (!is_pae(vcpu)) {
197 printk(KERN_DEBUG "set_cr0: #GP, start paging "
198 "in long mode while PAE is disabled\n");
199 inject_gp(vcpu);
200 return;
201 }
202 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
203 if (cs_l) {
204 printk(KERN_DEBUG "set_cr0: #GP, start paging "
205 "in long mode while CS.L == 1\n");
206 inject_gp(vcpu);
207 return;
208
209 }
210 } else
211#endif
212 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
213 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
214 "reserved bits\n");
215 inject_gp(vcpu);
216 return;
217 }
218
219 }
220
221 kvm_x86_ops->set_cr0(vcpu, cr0);
222 vcpu->cr0 = cr0;
223
224 mutex_lock(&vcpu->kvm->lock);
225 kvm_mmu_reset_context(vcpu);
226 mutex_unlock(&vcpu->kvm->lock);
227 return;
228}
229EXPORT_SYMBOL_GPL(set_cr0);
230
231void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
232{
233 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
234}
235EXPORT_SYMBOL_GPL(lmsw);
236
237void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
238{
239 if (cr4 & CR4_RESERVED_BITS) {
240 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
241 inject_gp(vcpu);
242 return;
243 }
244
245 if (is_long_mode(vcpu)) {
246 if (!(cr4 & X86_CR4_PAE)) {
247 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
248 "in long mode\n");
249 inject_gp(vcpu);
250 return;
251 }
252 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
253 && !load_pdptrs(vcpu, vcpu->cr3)) {
254 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
255 inject_gp(vcpu);
256 return;
257 }
258
259 if (cr4 & X86_CR4_VMXE) {
260 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
261 inject_gp(vcpu);
262 return;
263 }
264 kvm_x86_ops->set_cr4(vcpu, cr4);
265 vcpu->cr4 = cr4;
266 mutex_lock(&vcpu->kvm->lock);
267 kvm_mmu_reset_context(vcpu);
268 mutex_unlock(&vcpu->kvm->lock);
269}
270EXPORT_SYMBOL_GPL(set_cr4);
271
272void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
273{
274 if (is_long_mode(vcpu)) {
275 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
276 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
277 inject_gp(vcpu);
278 return;
279 }
280 } else {
281 if (is_pae(vcpu)) {
282 if (cr3 & CR3_PAE_RESERVED_BITS) {
283 printk(KERN_DEBUG
284 "set_cr3: #GP, reserved bits\n");
285 inject_gp(vcpu);
286 return;
287 }
288 if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
289 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
290 "reserved bits\n");
291 inject_gp(vcpu);
292 return;
293 }
294 }
295 /*
296 * We don't check reserved bits in nonpae mode, because
297 * this isn't enforced, and VMware depends on this.
298 */
299 }
300
301 mutex_lock(&vcpu->kvm->lock);
302 /*
303 * Does the new cr3 value map to physical memory? (Note, we
304 * catch an invalid cr3 even in real-mode, because it would
305 * cause trouble later on when we turn on paging anyway.)
306 *
307 * A real CPU would silently accept an invalid cr3 and would
308 * attempt to use it - with largely undefined (and often hard
309 * to debug) behavior on the guest side.
310 */
311 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
312 inject_gp(vcpu);
313 else {
314 vcpu->cr3 = cr3;
315 vcpu->mmu.new_cr3(vcpu);
316 }
317 mutex_unlock(&vcpu->kvm->lock);
318}
319EXPORT_SYMBOL_GPL(set_cr3);
320
321void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
322{
323 if (cr8 & CR8_RESERVED_BITS) {
324 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
325 inject_gp(vcpu);
326 return;
327 }
328 if (irqchip_in_kernel(vcpu->kvm))
329 kvm_lapic_set_tpr(vcpu, cr8);
330 else
331 vcpu->cr8 = cr8;
332}
333EXPORT_SYMBOL_GPL(set_cr8);
334
335unsigned long get_cr8(struct kvm_vcpu *vcpu)
336{
337 if (irqchip_in_kernel(vcpu->kvm))
338 return kvm_lapic_get_cr8(vcpu);
339 else
340 return vcpu->cr8;
341}
342EXPORT_SYMBOL_GPL(get_cr8);
343
043405e1
CO		 344/*
345 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
346 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
347 *
348 * This list is modified at module load time to reflect the
349 * capabilities of the host cpu.
350 */
351static u32 msrs_to_save[] = {
352 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
353 MSR_K6_STAR,
354#ifdef CONFIG_X86_64
355 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
356#endif
357 MSR_IA32_TIME_STAMP_COUNTER,
358};
359
360static unsigned num_msrs_to_save;
361
362static u32 emulated_msrs[] = {
363 MSR_IA32_MISC_ENABLE,
364};
365
15c4a640
CO		 366#ifdef CONFIG_X86_64
367
368static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
369{
370 if (efer & EFER_RESERVED_BITS) {
371 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
372 efer);
373 inject_gp(vcpu);
374 return;
375 }
376
377 if (is_paging(vcpu)
378 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
379 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
380 inject_gp(vcpu);
381 return;
382 }
383
384 kvm_x86_ops->set_efer(vcpu, efer);
385
386 efer &= ~EFER_LMA;
387 efer |= vcpu->shadow_efer & EFER_LMA;
388
389 vcpu->shadow_efer = efer;
390}
391
392#endif
393
394/*
395 * Writes msr value into into the appropriate "register".
396 * Returns 0 on success, non-0 otherwise.
397 * Assumes vcpu_load() was already called.
398 */
399int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
400{
401 return kvm_x86_ops->set_msr(vcpu, msr_index, data);
402}
403
313a3dc7
CO		 404/*
405 * Adapt set_msr() to msr_io()'s calling convention
406 */
407static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
408{
409 return kvm_set_msr(vcpu, index, *data);
410}
411
15c4a640
CO		 412
413int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
414{
415 switch (msr) {
416#ifdef CONFIG_X86_64
417 case MSR_EFER:
418 set_efer(vcpu, data);
419 break;
420#endif
421 case MSR_IA32_MC0_STATUS:
422 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
423 __FUNCTION__, data);
424 break;
425 case MSR_IA32_MCG_STATUS:
426 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
427 __FUNCTION__, data);
428 break;
429 case MSR_IA32_UCODE_REV:
430 case MSR_IA32_UCODE_WRITE:
431 case 0x200 ... 0x2ff: /* MTRRs */
432 break;
433 case MSR_IA32_APICBASE:
434 kvm_set_apic_base(vcpu, data);
435 break;
436 case MSR_IA32_MISC_ENABLE:
437 vcpu->ia32_misc_enable_msr = data;
438 break;
439 default:
440 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr);
441 return 1;
442 }
443 return 0;
444}
445EXPORT_SYMBOL_GPL(kvm_set_msr_common);
446
447
448/*
449 * Reads an msr value (of 'msr_index') into 'pdata'.
450 * Returns 0 on success, non-0 otherwise.
451 * Assumes vcpu_load() was already called.
452 */
453int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
454{
455 return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
456}
457
458int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
459{
460 u64 data;
461
462 switch (msr) {
463 case 0xc0010010: /* SYSCFG */
464 case 0xc0010015: /* HWCR */
465 case MSR_IA32_PLATFORM_ID:
466 case MSR_IA32_P5_MC_ADDR:
467 case MSR_IA32_P5_MC_TYPE:
468 case MSR_IA32_MC0_CTL:
469 case MSR_IA32_MCG_STATUS:
470 case MSR_IA32_MCG_CAP:
471 case MSR_IA32_MC0_MISC:
472 case MSR_IA32_MC0_MISC+4:
473 case MSR_IA32_MC0_MISC+8:
474 case MSR_IA32_MC0_MISC+12:
475 case MSR_IA32_MC0_MISC+16:
476 case MSR_IA32_UCODE_REV:
477 case MSR_IA32_PERF_STATUS:
478 case MSR_IA32_EBL_CR_POWERON:
479 /* MTRR registers */
480 case 0xfe:
481 case 0x200 ... 0x2ff:
482 data = 0;
483 break;
484 case 0xcd: /* fsb frequency */
485 data = 3;
486 break;
487 case MSR_IA32_APICBASE:
488 data = kvm_get_apic_base(vcpu);
489 break;
490 case MSR_IA32_MISC_ENABLE:
491 data = vcpu->ia32_misc_enable_msr;
492 break;
493#ifdef CONFIG_X86_64
494 case MSR_EFER:
495 data = vcpu->shadow_efer;
496 break;
497#endif
498 default:
499 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
500 return 1;
501 }
502 *pdata = data;
503 return 0;
504}
505EXPORT_SYMBOL_GPL(kvm_get_msr_common);
506
313a3dc7
CO		 507/*
508 * Read or write a bunch of msrs. All parameters are kernel addresses.
509 *
510 * @return number of msrs set successfully.
511 */
512static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
513 struct kvm_msr_entry *entries,
514 int (*do_msr)(struct kvm_vcpu *vcpu,
515 unsigned index, u64 *data))
516{
517 int i;
518
519 vcpu_load(vcpu);
520
521 for (i = 0; i < msrs->nmsrs; ++i)
522 if (do_msr(vcpu, entries[i].index, &entries[i].data))
523 break;
524
525 vcpu_put(vcpu);
526
527 return i;
528}
529
530/*
531 * Read or write a bunch of msrs. Parameters are user addresses.
532 *
533 * @return number of msrs set successfully.
534 */
535static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
536 int (*do_msr)(struct kvm_vcpu *vcpu,
537 unsigned index, u64 *data),
538 int writeback)
539{
540 struct kvm_msrs msrs;
541 struct kvm_msr_entry *entries;
542 int r, n;
543 unsigned size;
544
545 r = -EFAULT;
546 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
547 goto out;
548
549 r = -E2BIG;
550 if (msrs.nmsrs >= MAX_IO_MSRS)
551 goto out;
552
553 r = -ENOMEM;
554 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
555 entries = vmalloc(size);
556 if (!entries)
557 goto out;
558
559 r = -EFAULT;
560 if (copy_from_user(entries, user_msrs->entries, size))
561 goto out_free;
562
563 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
564 if (r < 0)
565 goto out_free;
566
567 r = -EFAULT;
568 if (writeback && copy_to_user(user_msrs->entries, entries, size))
569 goto out_free;
570
571 r = n;
572
573out_free:
574 vfree(entries);
575out:
576 return r;
577}
578
e9b11c17
ZX		 579/*
580 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
581 * cached on it.
582 */
583void decache_vcpus_on_cpu(int cpu)
584{
585 struct kvm *vm;
586 struct kvm_vcpu *vcpu;
587 int i;
588
589 spin_lock(&kvm_lock);
590 list_for_each_entry(vm, &vm_list, vm_list)
591 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
592 vcpu = vm->vcpus[i];
593 if (!vcpu)
594 continue;
595 /*
596 * If the vcpu is locked, then it is running on some
597 * other cpu and therefore it is not cached on the
598 * cpu in question.
599 *
600 * If it's not locked, check the last cpu it executed
601 * on.
602 */
603 if (mutex_trylock(&vcpu->mutex)) {
604 if (vcpu->cpu == cpu) {
605 kvm_x86_ops->vcpu_decache(vcpu);
606 vcpu->cpu = -1;
607 }
608 mutex_unlock(&vcpu->mutex);
609 }
610 }
611 spin_unlock(&kvm_lock);
612}
613
018d00d2
ZX		 614int kvm_dev_ioctl_check_extension(long ext)
615{
616 int r;
617
618 switch (ext) {
619 case KVM_CAP_IRQCHIP:
620 case KVM_CAP_HLT:
621 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
622 case KVM_CAP_USER_MEMORY:
623 case KVM_CAP_SET_TSS_ADDR:
624 r = 1;
625 break;
626 default:
627 r = 0;
628 break;
629 }
630 return r;
631
632}
633
043405e1
CO		 634long kvm_arch_dev_ioctl(struct file *filp,
635 unsigned int ioctl, unsigned long arg)
636{
637 void __user *argp = (void __user *)arg;
638 long r;
639
640 switch (ioctl) {
641 case KVM_GET_MSR_INDEX_LIST: {
642 struct kvm_msr_list __user *user_msr_list = argp;
643 struct kvm_msr_list msr_list;
644 unsigned n;
645
646 r = -EFAULT;
647 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
648 goto out;
649 n = msr_list.nmsrs;
650 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
651 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
652 goto out;
653 r = -E2BIG;
654 if (n < num_msrs_to_save)
655 goto out;
656 r = -EFAULT;
657 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
658 num_msrs_to_save * sizeof(u32)))
659 goto out;
660 if (copy_to_user(user_msr_list->indices
661 + num_msrs_to_save * sizeof(u32),
662 &emulated_msrs,
663 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
664 goto out;
665 r = 0;
666 break;
667 }
668 default:
669 r = -EINVAL;
670 }
671out:
672 return r;
673}
674
313a3dc7
CO		 675void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
676{
677 kvm_x86_ops->vcpu_load(vcpu, cpu);
678}
679
680void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
681{
682 kvm_x86_ops->vcpu_put(vcpu);
9327fd11 683 kvm_put_guest_fpu(vcpu);
313a3dc7
CO		 684}
685
686static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
687{
688 u64 efer;
689 int i;
690 struct kvm_cpuid_entry *e, *entry;
691
692 rdmsrl(MSR_EFER, efer);
693 entry = NULL;
694 for (i = 0; i < vcpu->cpuid_nent; ++i) {
695 e = &vcpu->cpuid_entries[i];
696 if (e->function == 0x80000001) {
697 entry = e;
698 break;
699 }
700 }
701 if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) {
702 entry->edx &= ~(1 << 20);
703 printk(KERN_INFO "kvm: guest NX capability removed\n");
704 }
705}
706
707static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
708 struct kvm_cpuid *cpuid,
709 struct kvm_cpuid_entry __user *entries)
710{
711 int r;
712
713 r = -E2BIG;
714 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
715 goto out;
716 r = -EFAULT;
717 if (copy_from_user(&vcpu->cpuid_entries, entries,
718 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
719 goto out;
720 vcpu->cpuid_nent = cpuid->nent;
721 cpuid_fix_nx_cap(vcpu);
722 return 0;
723
724out:
725 return r;
726}
727
728static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
729 struct kvm_lapic_state *s)
730{
731 vcpu_load(vcpu);
732 memcpy(s->regs, vcpu->apic->regs, sizeof *s);
733 vcpu_put(vcpu);
734
735 return 0;
736}
737
738static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
739 struct kvm_lapic_state *s)
740{
741 vcpu_load(vcpu);
742 memcpy(vcpu->apic->regs, s->regs, sizeof *s);
743 kvm_apic_post_state_restore(vcpu);
744 vcpu_put(vcpu);
745
746 return 0;
747}
748
749long kvm_arch_vcpu_ioctl(struct file *filp,
750 unsigned int ioctl, unsigned long arg)
751{
752 struct kvm_vcpu *vcpu = filp->private_data;
753 void __user *argp = (void __user *)arg;
754 int r;
755
756 switch (ioctl) {
757 case KVM_GET_LAPIC: {
758 struct kvm_lapic_state lapic;
759
760 memset(&lapic, 0, sizeof lapic);
761 r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic);
762 if (r)
763 goto out;
764 r = -EFAULT;
765 if (copy_to_user(argp, &lapic, sizeof lapic))
766 goto out;
767 r = 0;
768 break;
769 }
770 case KVM_SET_LAPIC: {
771 struct kvm_lapic_state lapic;
772
773 r = -EFAULT;
774 if (copy_from_user(&lapic, argp, sizeof lapic))
775 goto out;
776 r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);;
777 if (r)
778 goto out;
779 r = 0;
780 break;
781 }
782 case KVM_SET_CPUID: {
783 struct kvm_cpuid __user *cpuid_arg = argp;
784 struct kvm_cpuid cpuid;
785
786 r = -EFAULT;
787 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
788 goto out;
789 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
790 if (r)
791 goto out;
792 break;
793 }
794 case KVM_GET_MSRS:
795 r = msr_io(vcpu, argp, kvm_get_msr, 1);
796 break;
797 case KVM_SET_MSRS:
798 r = msr_io(vcpu, argp, do_set_msr, 0);
799 break;
800 default:
801 r = -EINVAL;
802 }
803out:
804 return r;
805}
806
1fe779f8
CO		 807static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
808{
809 int ret;
810
811 if (addr > (unsigned int)(-3 * PAGE_SIZE))
812 return -1;
813 ret = kvm_x86_ops->set_tss_addr(kvm, addr);
814 return ret;
815}
816
817static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
818 u32 kvm_nr_mmu_pages)
819{
820 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
821 return -EINVAL;
822
823 mutex_lock(&kvm->lock);
824
825 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
826 kvm->n_requested_mmu_pages = kvm_nr_mmu_pages;
827
828 mutex_unlock(&kvm->lock);
829 return 0;
830}
831
832static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
833{
834 return kvm->n_alloc_mmu_pages;
835}
836
837/*
838 * Set a new alias region. Aliases map a portion of physical memory into
839 * another portion. This is useful for memory windows, for example the PC
840 * VGA region.
841 */
842static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
843 struct kvm_memory_alias *alias)
844{
845 int r, n;
846 struct kvm_mem_alias *p;
847
848 r = -EINVAL;
849 /* General sanity checks */
850 if (alias->memory_size & (PAGE_SIZE - 1))
851 goto out;
852 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
853 goto out;
854 if (alias->slot >= KVM_ALIAS_SLOTS)
855 goto out;
856 if (alias->guest_phys_addr + alias->memory_size
857 < alias->guest_phys_addr)
858 goto out;
859 if (alias->target_phys_addr + alias->memory_size
860 < alias->target_phys_addr)
861 goto out;
862
863 mutex_lock(&kvm->lock);
864
865 p = &kvm->aliases[alias->slot];
866 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
867 p->npages = alias->memory_size >> PAGE_SHIFT;
868 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
869
870 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
871 if (kvm->aliases[n - 1].npages)
872 break;
873 kvm->naliases = n;
874
875 kvm_mmu_zap_all(kvm);
876
877 mutex_unlock(&kvm->lock);
878
879 return 0;
880
881out:
882 return r;
883}
884
885static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
886{
887 int r;
888
889 r = 0;
890 switch (chip->chip_id) {
891 case KVM_IRQCHIP_PIC_MASTER:
892 memcpy(&chip->chip.pic,
893 &pic_irqchip(kvm)->pics[0],
894 sizeof(struct kvm_pic_state));
895 break;
896 case KVM_IRQCHIP_PIC_SLAVE:
897 memcpy(&chip->chip.pic,
898 &pic_irqchip(kvm)->pics[1],
899 sizeof(struct kvm_pic_state));
900 break;
901 case KVM_IRQCHIP_IOAPIC:
902 memcpy(&chip->chip.ioapic,
903 ioapic_irqchip(kvm),
904 sizeof(struct kvm_ioapic_state));
905 break;
906 default:
907 r = -EINVAL;
908 break;
909 }
910 return r;
911}
912
913static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
914{
915 int r;
916
917 r = 0;
918 switch (chip->chip_id) {
919 case KVM_IRQCHIP_PIC_MASTER:
920 memcpy(&pic_irqchip(kvm)->pics[0],
921 &chip->chip.pic,
922 sizeof(struct kvm_pic_state));
923 break;
924 case KVM_IRQCHIP_PIC_SLAVE:
925 memcpy(&pic_irqchip(kvm)->pics[1],
926 &chip->chip.pic,
927 sizeof(struct kvm_pic_state));
928 break;
929 case KVM_IRQCHIP_IOAPIC:
930 memcpy(ioapic_irqchip(kvm),
931 &chip->chip.ioapic,
932 sizeof(struct kvm_ioapic_state));
933 break;
934 default:
935 r = -EINVAL;
936 break;
937 }
938 kvm_pic_update_irq(pic_irqchip(kvm));
939 return r;
940}
941
5bb064dc
ZX		 942/*
943 * Get (and clear) the dirty memory log for a memory slot.
944 */
945int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
946 struct kvm_dirty_log *log)
947{
948 int r;
949 int n;
950 struct kvm_memory_slot *memslot;
951 int is_dirty = 0;
952
953 mutex_lock(&kvm->lock);
954
955 r = kvm_get_dirty_log(kvm, log, &is_dirty);
956 if (r)
957 goto out;
958
959 /* If nothing is dirty, don't bother messing with page tables. */
960 if (is_dirty) {
961 kvm_mmu_slot_remove_write_access(kvm, log->slot);
962 kvm_flush_remote_tlbs(kvm);
963 memslot = &kvm->memslots[log->slot];
964 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
965 memset(memslot->dirty_bitmap, 0, n);
966 }
967 r = 0;
968out:
969 mutex_unlock(&kvm->lock);
970 return r;
971}
972
1fe779f8
CO		 973long kvm_arch_vm_ioctl(struct file *filp,
974 unsigned int ioctl, unsigned long arg)
975{
976 struct kvm *kvm = filp->private_data;
977 void __user *argp = (void __user *)arg;
978 int r = -EINVAL;
979
980 switch (ioctl) {
981 case KVM_SET_TSS_ADDR:
982 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
983 if (r < 0)
984 goto out;
985 break;
986 case KVM_SET_MEMORY_REGION: {
987 struct kvm_memory_region kvm_mem;
988 struct kvm_userspace_memory_region kvm_userspace_mem;
989
990 r = -EFAULT;
991 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
992 goto out;
993 kvm_userspace_mem.slot = kvm_mem.slot;
994 kvm_userspace_mem.flags = kvm_mem.flags;
995 kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;
996 kvm_userspace_mem.memory_size = kvm_mem.memory_size;
997 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);
998 if (r)
999 goto out;
1000 break;
1001 }
1002 case KVM_SET_NR_MMU_PAGES:
1003 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
1004 if (r)
1005 goto out;
1006 break;
1007 case KVM_GET_NR_MMU_PAGES:
1008 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
1009 break;
1010 case KVM_SET_MEMORY_ALIAS: {
1011 struct kvm_memory_alias alias;
1012
1013 r = -EFAULT;
1014 if (copy_from_user(&alias, argp, sizeof alias))
1015 goto out;
1016 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
1017 if (r)
1018 goto out;
1019 break;
1020 }
1021 case KVM_CREATE_IRQCHIP:
1022 r = -ENOMEM;
1023 kvm->vpic = kvm_create_pic(kvm);
1024 if (kvm->vpic) {
1025 r = kvm_ioapic_init(kvm);
1026 if (r) {
1027 kfree(kvm->vpic);
1028 kvm->vpic = NULL;
1029 goto out;
1030 }
1031 } else
1032 goto out;
1033 break;
1034 case KVM_IRQ_LINE: {
1035 struct kvm_irq_level irq_event;
1036
1037 r = -EFAULT;
1038 if (copy_from_user(&irq_event, argp, sizeof irq_event))
1039 goto out;
1040 if (irqchip_in_kernel(kvm)) {
1041 mutex_lock(&kvm->lock);
1042 if (irq_event.irq < 16)
1043 kvm_pic_set_irq(pic_irqchip(kvm),
1044 irq_event.irq,
1045 irq_event.level);
1046 kvm_ioapic_set_irq(kvm->vioapic,
1047 irq_event.irq,
1048 irq_event.level);
1049 mutex_unlock(&kvm->lock);
1050 r = 0;
1051 }
1052 break;
1053 }
1054 case KVM_GET_IRQCHIP: {
1055 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1056 struct kvm_irqchip chip;
1057
1058 r = -EFAULT;
1059 if (copy_from_user(&chip, argp, sizeof chip))
1060 goto out;
1061 r = -ENXIO;
1062 if (!irqchip_in_kernel(kvm))
1063 goto out;
1064 r = kvm_vm_ioctl_get_irqchip(kvm, &chip);
1065 if (r)
1066 goto out;
1067 r = -EFAULT;
1068 if (copy_to_user(argp, &chip, sizeof chip))
1069 goto out;
1070 r = 0;
1071 break;
1072 }
1073 case KVM_SET_IRQCHIP: {
1074 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1075 struct kvm_irqchip chip;
1076
1077 r = -EFAULT;
1078 if (copy_from_user(&chip, argp, sizeof chip))
1079 goto out;
1080 r = -ENXIO;
1081 if (!irqchip_in_kernel(kvm))
1082 goto out;
1083 r = kvm_vm_ioctl_set_irqchip(kvm, &chip);
1084 if (r)
1085 goto out;
1086 r = 0;
1087 break;
1088 }
1089 default:
1090 ;
1091 }
1092out:
1093 return r;
1094}
1095
a16b043c 1096static void kvm_init_msr_list(void)
043405e1
CO		 1097{
1098 u32 dummy[2];
1099 unsigned i, j;
1100
1101 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1102 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1103 continue;
1104 if (j < i)
1105 msrs_to_save[j] = msrs_to_save[i];
1106 j++;
1107 }
1108 num_msrs_to_save = j;
1109}
1110
bbd9b64e
CO		 1111/*
1112 * Only apic need an MMIO device hook, so shortcut now..
1113 */
1114static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
1115 gpa_t addr)
1116{
1117 struct kvm_io_device *dev;
1118
1119 if (vcpu->apic) {
1120 dev = &vcpu->apic->dev;
1121 if (dev->in_range(dev, addr))
1122 return dev;
1123 }
1124 return NULL;
1125}
1126
1127
1128static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1129 gpa_t addr)
1130{
1131 struct kvm_io_device *dev;
1132
1133 dev = vcpu_find_pervcpu_dev(vcpu, addr);
1134 if (dev == NULL)
1135 dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1136 return dev;
1137}
1138
1139int emulator_read_std(unsigned long addr,
1140 void *val,
1141 unsigned int bytes,
1142 struct kvm_vcpu *vcpu)
1143{
1144 void *data = val;
1145
1146 while (bytes) {
1147 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1148 unsigned offset = addr & (PAGE_SIZE-1);
1149 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1150 int ret;
1151
1152 if (gpa == UNMAPPED_GVA)
1153 return X86EMUL_PROPAGATE_FAULT;
1154 ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
1155 if (ret < 0)
1156 return X86EMUL_UNHANDLEABLE;
1157
1158 bytes -= tocopy;
1159 data += tocopy;
1160 addr += tocopy;
1161 }
1162
1163 return X86EMUL_CONTINUE;
1164}
1165EXPORT_SYMBOL_GPL(emulator_read_std);
1166
bbd9b64e
CO		 1167static int emulator_read_emulated(unsigned long addr,
1168 void *val,
1169 unsigned int bytes,
1170 struct kvm_vcpu *vcpu)
1171{
1172 struct kvm_io_device *mmio_dev;
1173 gpa_t gpa;
1174
1175 if (vcpu->mmio_read_completed) {
1176 memcpy(val, vcpu->mmio_data, bytes);
1177 vcpu->mmio_read_completed = 0;
1178 return X86EMUL_CONTINUE;
1179 }
1180
1181 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1182
1183 /* For APIC access vmexit */
1184 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1185 goto mmio;
1186
1187 if (emulator_read_std(addr, val, bytes, vcpu)
1188 == X86EMUL_CONTINUE)
1189 return X86EMUL_CONTINUE;
1190 if (gpa == UNMAPPED_GVA)
1191 return X86EMUL_PROPAGATE_FAULT;
1192
1193mmio:
1194 /*
1195 * Is this MMIO handled locally?
1196 */
1197 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1198 if (mmio_dev) {
1199 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1200 return X86EMUL_CONTINUE;
1201 }
1202
1203 vcpu->mmio_needed = 1;
1204 vcpu->mmio_phys_addr = gpa;
1205 vcpu->mmio_size = bytes;
1206 vcpu->mmio_is_write = 0;
1207
1208 return X86EMUL_UNHANDLEABLE;
1209}
1210
1211static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1212 const void *val, int bytes)
1213{
1214 int ret;
1215
1216 ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
1217 if (ret < 0)
1218 return 0;
1219 kvm_mmu_pte_write(vcpu, gpa, val, bytes);
1220 return 1;
1221}
1222
1223static int emulator_write_emulated_onepage(unsigned long addr,
1224 const void *val,
1225 unsigned int bytes,
1226 struct kvm_vcpu *vcpu)
1227{
1228 struct kvm_io_device *mmio_dev;
1229 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1230
1231 if (gpa == UNMAPPED_GVA) {
1232 kvm_x86_ops->inject_page_fault(vcpu, addr, 2);
1233 return X86EMUL_PROPAGATE_FAULT;
1234 }
1235
1236 /* For APIC access vmexit */
1237 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1238 goto mmio;
1239
1240 if (emulator_write_phys(vcpu, gpa, val, bytes))
1241 return X86EMUL_CONTINUE;
1242
1243mmio:
1244 /*
1245 * Is this MMIO handled locally?
1246 */
1247 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1248 if (mmio_dev) {
1249 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1250 return X86EMUL_CONTINUE;
1251 }
1252
1253 vcpu->mmio_needed = 1;
1254 vcpu->mmio_phys_addr = gpa;
1255 vcpu->mmio_size = bytes;
1256 vcpu->mmio_is_write = 1;
1257 memcpy(vcpu->mmio_data, val, bytes);
1258
1259 return X86EMUL_CONTINUE;
1260}
1261
1262int emulator_write_emulated(unsigned long addr,
1263 const void *val,
1264 unsigned int bytes,
1265 struct kvm_vcpu *vcpu)
1266{
1267 /* Crossing a page boundary? */
1268 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1269 int rc, now;
1270
1271 now = -addr & ~PAGE_MASK;
1272 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
1273 if (rc != X86EMUL_CONTINUE)
1274 return rc;
1275 addr += now;
1276 val += now;
1277 bytes -= now;
1278 }
1279 return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
1280}
1281EXPORT_SYMBOL_GPL(emulator_write_emulated);
1282
1283static int emulator_cmpxchg_emulated(unsigned long addr,
1284 const void *old,
1285 const void *new,
1286 unsigned int bytes,
1287 struct kvm_vcpu *vcpu)
1288{
1289 static int reported;
1290
1291 if (!reported) {
1292 reported = 1;
1293 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1294 }
1295 return emulator_write_emulated(addr, new, bytes, vcpu);
1296}
1297
1298static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1299{
1300 return kvm_x86_ops->get_segment_base(vcpu, seg);
1301}
1302
1303int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1304{
1305 return X86EMUL_CONTINUE;
1306}
1307
1308int emulate_clts(struct kvm_vcpu *vcpu)
1309{
1310 kvm_x86_ops->set_cr0(vcpu, vcpu->cr0 & ~X86_CR0_TS);
1311 return X86EMUL_CONTINUE;
1312}
1313
1314int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
1315{
1316 struct kvm_vcpu *vcpu = ctxt->vcpu;
1317
1318 switch (dr) {
1319 case 0 ... 3:
1320 *dest = kvm_x86_ops->get_dr(vcpu, dr);
1321 return X86EMUL_CONTINUE;
1322 default:
1323 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
1324 return X86EMUL_UNHANDLEABLE;
1325 }
1326}
1327
1328int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1329{
1330 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1331 int exception;
1332
1333 kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1334 if (exception) {
1335 /* FIXME: better handling */
1336 return X86EMUL_UNHANDLEABLE;
1337 }
1338 return X86EMUL_CONTINUE;
1339}
1340
1341void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
1342{
1343 static int reported;
1344 u8 opcodes[4];
1345 unsigned long rip = vcpu->rip;
1346 unsigned long rip_linear;
1347
1348 rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
1349
1350 if (reported)
1351 return;
1352
1353 emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
1354
1355 printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
1356 context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1357 reported = 1;
1358}
1359EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
1360
1361struct x86_emulate_ops emulate_ops = {
1362 .read_std = emulator_read_std,
bbd9b64e
CO		 1363 .read_emulated = emulator_read_emulated,
1364 .write_emulated = emulator_write_emulated,
1365 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1366};
1367
1368int emulate_instruction(struct kvm_vcpu *vcpu,
1369 struct kvm_run *run,
1370 unsigned long cr2,
1371 u16 error_code,
1372 int no_decode)
1373{
1374 int r;
1375
1376 vcpu->mmio_fault_cr2 = cr2;
1377 kvm_x86_ops->cache_regs(vcpu);
1378
1379 vcpu->mmio_is_write = 0;
1380 vcpu->pio.string = 0;
1381
1382 if (!no_decode) {
1383 int cs_db, cs_l;
1384 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1385
1386 vcpu->emulate_ctxt.vcpu = vcpu;
1387 vcpu->emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
1388 vcpu->emulate_ctxt.cr2 = cr2;
1389 vcpu->emulate_ctxt.mode =
1390 (vcpu->emulate_ctxt.eflags & X86_EFLAGS_VM)
1391 ? X86EMUL_MODE_REAL : cs_l
1392 ? X86EMUL_MODE_PROT64 : cs_db
1393 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1394
1395 if (vcpu->emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1396 vcpu->emulate_ctxt.cs_base = 0;
1397 vcpu->emulate_ctxt.ds_base = 0;
1398 vcpu->emulate_ctxt.es_base = 0;
1399 vcpu->emulate_ctxt.ss_base = 0;
1400 } else {
1401 vcpu->emulate_ctxt.cs_base =
1402 get_segment_base(vcpu, VCPU_SREG_CS);
1403 vcpu->emulate_ctxt.ds_base =
1404 get_segment_base(vcpu, VCPU_SREG_DS);
1405 vcpu->emulate_ctxt.es_base =
1406 get_segment_base(vcpu, VCPU_SREG_ES);
1407 vcpu->emulate_ctxt.ss_base =
1408 get_segment_base(vcpu, VCPU_SREG_SS);
1409 }
1410
1411 vcpu->emulate_ctxt.gs_base =
1412 get_segment_base(vcpu, VCPU_SREG_GS);
1413 vcpu->emulate_ctxt.fs_base =
1414 get_segment_base(vcpu, VCPU_SREG_FS);
1415
1416 r = x86_decode_insn(&vcpu->emulate_ctxt, &emulate_ops);
f2b5756b 1417 ++vcpu->stat.insn_emulation;
bbd9b64e 1418 if (r) {
f2b5756b 1419 ++vcpu->stat.insn_emulation_fail;
bbd9b64e
CO		 1420 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1421 return EMULATE_DONE;
1422 return EMULATE_FAIL;
1423 }
1424 }
1425
1426 r = x86_emulate_insn(&vcpu->emulate_ctxt, &emulate_ops);
1427
1428 if (vcpu->pio.string)
1429 return EMULATE_DO_MMIO;
1430
1431 if ((r || vcpu->mmio_is_write) && run) {
1432 run->exit_reason = KVM_EXIT_MMIO;
1433 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1434 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1435 run->mmio.len = vcpu->mmio_size;
1436 run->mmio.is_write = vcpu->mmio_is_write;
1437 }
1438
1439 if (r) {
1440 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1441 return EMULATE_DONE;
1442 if (!vcpu->mmio_needed) {
1443 kvm_report_emulation_failure(vcpu, "mmio");
1444 return EMULATE_FAIL;
1445 }
1446 return EMULATE_DO_MMIO;
1447 }
1448
1449 kvm_x86_ops->decache_regs(vcpu);
1450 kvm_x86_ops->set_rflags(vcpu, vcpu->emulate_ctxt.eflags);
1451
1452 if (vcpu->mmio_is_write) {
1453 vcpu->mmio_needed = 0;
1454 return EMULATE_DO_MMIO;
1455 }
1456
1457 return EMULATE_DONE;
1458}
1459EXPORT_SYMBOL_GPL(emulate_instruction);
1460
de7d789a
CO		 1461static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
1462{
1463 int i;
1464
1465 for (i = 0; i < ARRAY_SIZE(vcpu->pio.guest_pages); ++i)
1466 if (vcpu->pio.guest_pages[i]) {
b4231d61 1467 kvm_release_page_dirty(vcpu->pio.guest_pages[i]);
de7d789a
CO		 1468 vcpu->pio.guest_pages[i] = NULL;
1469 }
1470}
1471
1472static int pio_copy_data(struct kvm_vcpu *vcpu)
1473{
1474 void *p = vcpu->pio_data;
1475 void *q;
1476 unsigned bytes;
1477 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1478
1479 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1480 PAGE_KERNEL);
1481 if (!q) {
1482 free_pio_guest_pages(vcpu);
1483 return -ENOMEM;
1484 }
1485 q += vcpu->pio.guest_page_offset;
1486 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1487 if (vcpu->pio.in)
1488 memcpy(q, p, bytes);
1489 else
1490 memcpy(p, q, bytes);
1491 q -= vcpu->pio.guest_page_offset;
1492 vunmap(q);
1493 free_pio_guest_pages(vcpu);
1494 return 0;
1495}
1496
1497int complete_pio(struct kvm_vcpu *vcpu)
1498{
1499 struct kvm_pio_request *io = &vcpu->pio;
1500 long delta;
1501 int r;
1502
1503 kvm_x86_ops->cache_regs(vcpu);
1504
1505 if (!io->string) {
1506 if (io->in)
1507 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
1508 io->size);
1509 } else {
1510 if (io->in) {
1511 r = pio_copy_data(vcpu);
1512 if (r) {
1513 kvm_x86_ops->cache_regs(vcpu);
1514 return r;
1515 }
1516 }
1517
1518 delta = 1;
1519 if (io->rep) {
1520 delta *= io->cur_count;
1521 /*
1522 * The size of the register should really depend on
1523 * current address size.
1524 */
1525 vcpu->regs[VCPU_REGS_RCX] -= delta;
1526 }
1527 if (io->down)
1528 delta = -delta;
1529 delta *= io->size;
1530 if (io->in)
1531 vcpu->regs[VCPU_REGS_RDI] += delta;
1532 else
1533 vcpu->regs[VCPU_REGS_RSI] += delta;
1534 }
1535
1536 kvm_x86_ops->decache_regs(vcpu);
1537
1538 io->count -= io->cur_count;
1539 io->cur_count = 0;
1540
1541 return 0;
1542}
1543
1544static void kernel_pio(struct kvm_io_device *pio_dev,
1545 struct kvm_vcpu *vcpu,
1546 void *pd)
1547{
1548 /* TODO: String I/O for in kernel device */
1549
1550 mutex_lock(&vcpu->kvm->lock);
1551 if (vcpu->pio.in)
1552 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1553 vcpu->pio.size,
1554 pd);
1555 else
1556 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1557 vcpu->pio.size,
1558 pd);
1559 mutex_unlock(&vcpu->kvm->lock);
1560}
1561
1562static void pio_string_write(struct kvm_io_device *pio_dev,
1563 struct kvm_vcpu *vcpu)
1564{
1565 struct kvm_pio_request *io = &vcpu->pio;
1566 void *pd = vcpu->pio_data;
1567 int i;
1568
1569 mutex_lock(&vcpu->kvm->lock);
1570 for (i = 0; i < io->cur_count; i++) {
1571 kvm_iodevice_write(pio_dev, io->port,
1572 io->size,
1573 pd);
1574 pd += io->size;
1575 }
1576 mutex_unlock(&vcpu->kvm->lock);
1577}
1578
1579static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
1580 gpa_t addr)
1581{
1582 return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
1583}
1584
1585int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1586 int size, unsigned port)
1587{
1588 struct kvm_io_device *pio_dev;
1589
1590 vcpu->run->exit_reason = KVM_EXIT_IO;
1591 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1592 vcpu->run->io.size = vcpu->pio.size = size;
1593 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1594 vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = 1;
1595 vcpu->run->io.port = vcpu->pio.port = port;
1596 vcpu->pio.in = in;
1597 vcpu->pio.string = 0;
1598 vcpu->pio.down = 0;
1599 vcpu->pio.guest_page_offset = 0;
1600 vcpu->pio.rep = 0;
1601
1602 kvm_x86_ops->cache_regs(vcpu);
1603 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1604 kvm_x86_ops->decache_regs(vcpu);
1605
1606 kvm_x86_ops->skip_emulated_instruction(vcpu);
1607
1608 pio_dev = vcpu_find_pio_dev(vcpu, port);
1609 if (pio_dev) {
1610 kernel_pio(pio_dev, vcpu, vcpu->pio_data);
1611 complete_pio(vcpu);
1612 return 1;
1613 }
1614 return 0;
1615}
1616EXPORT_SYMBOL_GPL(kvm_emulate_pio);
1617
1618int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1619 int size, unsigned long count, int down,
1620 gva_t address, int rep, unsigned port)
1621{
1622 unsigned now, in_page;
1623 int i, ret = 0;
1624 int nr_pages = 1;
1625 struct page *page;
1626 struct kvm_io_device *pio_dev;
1627
1628 vcpu->run->exit_reason = KVM_EXIT_IO;
1629 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1630 vcpu->run->io.size = vcpu->pio.size = size;
1631 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1632 vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = count;
1633 vcpu->run->io.port = vcpu->pio.port = port;
1634 vcpu->pio.in = in;
1635 vcpu->pio.string = 1;
1636 vcpu->pio.down = down;
1637 vcpu->pio.guest_page_offset = offset_in_page(address);
1638 vcpu->pio.rep = rep;
1639
1640 if (!count) {
1641 kvm_x86_ops->skip_emulated_instruction(vcpu);
1642 return 1;
1643 }
1644
1645 if (!down)
1646 in_page = PAGE_SIZE - offset_in_page(address);
1647 else
1648 in_page = offset_in_page(address) + size;
1649 now = min(count, (unsigned long)in_page / size);
1650 if (!now) {
1651 /*
1652 * String I/O straddles page boundary. Pin two guest pages
1653 * so that we satisfy atomicity constraints. Do just one
1654 * transaction to avoid complexity.
1655 */
1656 nr_pages = 2;
1657 now = 1;
1658 }
1659 if (down) {
1660 /*
1661 * String I/O in reverse. Yuck. Kill the guest, fix later.
1662 */
1663 pr_unimpl(vcpu, "guest string pio down\n");
1664 inject_gp(vcpu);
1665 return 1;
1666 }
1667 vcpu->run->io.count = now;
1668 vcpu->pio.cur_count = now;
1669
1670 if (vcpu->pio.cur_count == vcpu->pio.count)
1671 kvm_x86_ops->skip_emulated_instruction(vcpu);
1672
1673 for (i = 0; i < nr_pages; ++i) {
1674 mutex_lock(&vcpu->kvm->lock);
1675 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1676 vcpu->pio.guest_pages[i] = page;
1677 mutex_unlock(&vcpu->kvm->lock);
1678 if (!page) {
1679 inject_gp(vcpu);
1680 free_pio_guest_pages(vcpu);
1681 return 1;
1682 }
1683 }
1684
1685 pio_dev = vcpu_find_pio_dev(vcpu, port);
1686 if (!vcpu->pio.in) {
1687 /* string PIO write */
1688 ret = pio_copy_data(vcpu);
1689 if (ret >= 0 && pio_dev) {
1690 pio_string_write(pio_dev, vcpu);
1691 complete_pio(vcpu);
1692 if (vcpu->pio.count == 0)
1693 ret = 1;
1694 }
1695 } else if (pio_dev)
1696 pr_unimpl(vcpu, "no string pio read support yet, "
1697 "port %x size %d count %ld\n",
1698 port, size, count);
1699
1700 return ret;
1701}
1702EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
1703
f8c16bba 1704int kvm_arch_init(void *opaque)
043405e1 1705{
56c6d28a 1706 int r;
f8c16bba
ZX		 1707 struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
1708
56c6d28a
ZX		 1709 r = kvm_mmu_module_init();
1710 if (r)
1711 goto out_fail;
1712
043405e1 1713 kvm_init_msr_list();
f8c16bba
ZX		 1714
1715 if (kvm_x86_ops) {
1716 printk(KERN_ERR "kvm: already loaded the other module\n");
56c6d28a
ZX		 1717 r = -EEXIST;
1718 goto out;
f8c16bba
ZX		 1719 }
1720
1721 if (!ops->cpu_has_kvm_support()) {
1722 printk(KERN_ERR "kvm: no hardware support\n");
56c6d28a
ZX		 1723 r = -EOPNOTSUPP;
1724 goto out;
f8c16bba
ZX		 1725 }
1726 if (ops->disabled_by_bios()) {
1727 printk(KERN_ERR "kvm: disabled by bios\n");
56c6d28a
ZX		 1728 r = -EOPNOTSUPP;
1729 goto out;
f8c16bba
ZX		 1730 }
1731
1732 kvm_x86_ops = ops;
56c6d28a 1733 kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
f8c16bba 1734 return 0;
56c6d28a
ZX		 1735
1736out:
1737 kvm_mmu_module_exit();
1738out_fail:
1739 return r;
043405e1 1740}
8776e519 1741
f8c16bba
ZX		 1742void kvm_arch_exit(void)
1743{
1744 kvm_x86_ops = NULL;
56c6d28a
ZX		 1745 kvm_mmu_module_exit();
1746}
f8c16bba 1747
8776e519
HB		 1748int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1749{
1750 ++vcpu->stat.halt_exits;
1751 if (irqchip_in_kernel(vcpu->kvm)) {
1752 vcpu->mp_state = VCPU_MP_STATE_HALTED;
1753 kvm_vcpu_block(vcpu);
1754 if (vcpu->mp_state != VCPU_MP_STATE_RUNNABLE)
1755 return -EINTR;
1756 return 1;
1757 } else {
1758 vcpu->run->exit_reason = KVM_EXIT_HLT;
1759 return 0;
1760 }
1761}
1762EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1763
1764int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
1765{
1766 unsigned long nr, a0, a1, a2, a3, ret;
1767
1768 kvm_x86_ops->cache_regs(vcpu);
1769
1770 nr = vcpu->regs[VCPU_REGS_RAX];
1771 a0 = vcpu->regs[VCPU_REGS_RBX];
1772 a1 = vcpu->regs[VCPU_REGS_RCX];
1773 a2 = vcpu->regs[VCPU_REGS_RDX];
1774 a3 = vcpu->regs[VCPU_REGS_RSI];
1775
1776 if (!is_long_mode(vcpu)) {
1777 nr &= 0xFFFFFFFF;
1778 a0 &= 0xFFFFFFFF;
1779 a1 &= 0xFFFFFFFF;
1780 a2 &= 0xFFFFFFFF;
1781 a3 &= 0xFFFFFFFF;
1782 }
1783
1784 switch (nr) {
1785 default:
1786 ret = -KVM_ENOSYS;
1787 break;
1788 }
1789 vcpu->regs[VCPU_REGS_RAX] = ret;
1790 kvm_x86_ops->decache_regs(vcpu);
1791 return 0;
1792}
1793EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
1794
1795int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
1796{
1797 char instruction[3];
1798 int ret = 0;
1799
1800 mutex_lock(&vcpu->kvm->lock);
1801
1802 /*
1803 * Blow out the MMU to ensure that no other VCPU has an active mapping
1804 * to ensure that the updated hypercall appears atomically across all
1805 * VCPUs.
1806 */
1807 kvm_mmu_zap_all(vcpu->kvm);
1808
1809 kvm_x86_ops->cache_regs(vcpu);
1810 kvm_x86_ops->patch_hypercall(vcpu, instruction);
1811 if (emulator_write_emulated(vcpu->rip, instruction, 3, vcpu)
1812 != X86EMUL_CONTINUE)
1813 ret = -EFAULT;
1814
1815 mutex_unlock(&vcpu->kvm->lock);
1816
1817 return ret;
1818}
1819
1820static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1821{
1822 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1823}
1824
1825void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1826{
1827 struct descriptor_table dt = { limit, base };
1828
1829 kvm_x86_ops->set_gdt(vcpu, &dt);
1830}
1831
1832void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1833{
1834 struct descriptor_table dt = { limit, base };
1835
1836 kvm_x86_ops->set_idt(vcpu, &dt);
1837}
1838
1839void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1840 unsigned long *rflags)
1841{
1842 lmsw(vcpu, msw);
1843 *rflags = kvm_x86_ops->get_rflags(vcpu);
1844}
1845
1846unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1847{
1848 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
1849 switch (cr) {
1850 case 0:
1851 return vcpu->cr0;
1852 case 2:
1853 return vcpu->cr2;
1854 case 3:
1855 return vcpu->cr3;
1856 case 4:
1857 return vcpu->cr4;
1858 default:
1859 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1860 return 0;
1861 }
1862}
1863
1864void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1865 unsigned long *rflags)
1866{
1867 switch (cr) {
1868 case 0:
1869 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1870 *rflags = kvm_x86_ops->get_rflags(vcpu);
1871 break;
1872 case 2:
1873 vcpu->cr2 = val;
1874 break;
1875 case 3:
1876 set_cr3(vcpu, val);
1877 break;
1878 case 4:
1879 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1880 break;
1881 default:
1882 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1883 }
1884}
1885
1886void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1887{
1888 int i;
1889 u32 function;
1890 struct kvm_cpuid_entry *e, *best;
1891
1892 kvm_x86_ops->cache_regs(vcpu);
1893 function = vcpu->regs[VCPU_REGS_RAX];
1894 vcpu->regs[VCPU_REGS_RAX] = 0;
1895 vcpu->regs[VCPU_REGS_RBX] = 0;
1896 vcpu->regs[VCPU_REGS_RCX] = 0;
1897 vcpu->regs[VCPU_REGS_RDX] = 0;
1898 best = NULL;
1899 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1900 e = &vcpu->cpuid_entries[i];
1901 if (e->function == function) {
1902 best = e;
1903 break;
1904 }
1905 /*
1906 * Both basic or both extended?
1907 */
1908 if (((e->function ^ function) & 0x80000000) == 0)
1909 if (!best || e->function > best->function)
1910 best = e;
1911 }
1912 if (best) {
1913 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1914 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1915 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1916 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1917 }
1918 kvm_x86_ops->decache_regs(vcpu);
1919 kvm_x86_ops->skip_emulated_instruction(vcpu);
1920}
1921EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
d0752060 1922
b6c7a5dc
HB		 1923/*
1924 * Check if userspace requested an interrupt window, and that the
1925 * interrupt window is open.
1926 *
1927 * No need to exit to userspace if we already have an interrupt queued.
1928 */
1929static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
1930 struct kvm_run *kvm_run)
1931{
1932 return (!vcpu->irq_summary &&
1933 kvm_run->request_interrupt_window &&
1934 vcpu->interrupt_window_open &&
1935 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
1936}
1937
1938static void post_kvm_run_save(struct kvm_vcpu *vcpu,
1939 struct kvm_run *kvm_run)
1940{
1941 kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
1942 kvm_run->cr8 = get_cr8(vcpu);
1943 kvm_run->apic_base = kvm_get_apic_base(vcpu);
1944 if (irqchip_in_kernel(vcpu->kvm))
1945 kvm_run->ready_for_interrupt_injection = 1;
1946 else
1947 kvm_run->ready_for_interrupt_injection =
1948 (vcpu->interrupt_window_open &&
1949 vcpu->irq_summary == 0);
1950}
1951
1952static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1953{
1954 int r;
1955
1956 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_SIPI_RECEIVED)) {
1957 pr_debug("vcpu %d received sipi with vector # %x\n",
1958 vcpu->vcpu_id, vcpu->sipi_vector);
1959 kvm_lapic_reset(vcpu);
1960 r = kvm_x86_ops->vcpu_reset(vcpu);
1961 if (r)
1962 return r;
1963 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
1964 }
1965
1966preempted:
1967 if (vcpu->guest_debug.enabled)
1968 kvm_x86_ops->guest_debug_pre(vcpu);
1969
1970again:
1971 r = kvm_mmu_reload(vcpu);
1972 if (unlikely(r))
1973 goto out;
1974
1975 kvm_inject_pending_timer_irqs(vcpu);
1976
1977 preempt_disable();
1978
1979 kvm_x86_ops->prepare_guest_switch(vcpu);
1980 kvm_load_guest_fpu(vcpu);
1981
1982 local_irq_disable();
1983
1984 if (signal_pending(current)) {
1985 local_irq_enable();
1986 preempt_enable();
1987 r = -EINTR;
1988 kvm_run->exit_reason = KVM_EXIT_INTR;
1989 ++vcpu->stat.signal_exits;
1990 goto out;
1991 }
1992
1993 if (irqchip_in_kernel(vcpu->kvm))
1994 kvm_x86_ops->inject_pending_irq(vcpu);
1995 else if (!vcpu->mmio_read_completed)
1996 kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);
1997
1998 vcpu->guest_mode = 1;
1999 kvm_guest_enter();
2000
2001 if (vcpu->requests)
2002 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
2003 kvm_x86_ops->tlb_flush(vcpu);
2004
2005 kvm_x86_ops->run(vcpu, kvm_run);
2006
2007 vcpu->guest_mode = 0;
2008 local_irq_enable();
2009
2010 ++vcpu->stat.exits;
2011
2012 /*
2013 * We must have an instruction between local_irq_enable() and
2014 * kvm_guest_exit(), so the timer interrupt isn't delayed by
2015 * the interrupt shadow. The stat.exits increment will do nicely.
2016 * But we need to prevent reordering, hence this barrier():
2017 */
2018 barrier();
2019
2020 kvm_guest_exit();
2021
2022 preempt_enable();
2023
2024 /*
2025 * Profile KVM exit RIPs:
2026 */
2027 if (unlikely(prof_on == KVM_PROFILING)) {
2028 kvm_x86_ops->cache_regs(vcpu);
2029 profile_hit(KVM_PROFILING, (void *)vcpu->rip);
2030 }
2031
2032 r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
2033
2034 if (r > 0) {
2035 if (dm_request_for_irq_injection(vcpu, kvm_run)) {
2036 r = -EINTR;
2037 kvm_run->exit_reason = KVM_EXIT_INTR;
2038 ++vcpu->stat.request_irq_exits;
2039 goto out;
2040 }
e1beb1d3 2041 if (!need_resched())
b6c7a5dc 2042 goto again;
b6c7a5dc
HB		 2043 }
2044
2045out:
2046 if (r > 0) {
2047 kvm_resched(vcpu);
2048 goto preempted;
2049 }
2050
2051 post_kvm_run_save(vcpu, kvm_run);
2052
2053 return r;
2054}
2055
2056int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2057{
2058 int r;
2059 sigset_t sigsaved;
2060
2061 vcpu_load(vcpu);
2062
2063 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_UNINITIALIZED)) {
2064 kvm_vcpu_block(vcpu);
2065 vcpu_put(vcpu);
2066 return -EAGAIN;
2067 }
2068
2069 if (vcpu->sigset_active)
2070 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
2071
2072 /* re-sync apic's tpr */
2073 if (!irqchip_in_kernel(vcpu->kvm))
2074 set_cr8(vcpu, kvm_run->cr8);
2075
2076 if (vcpu->pio.cur_count) {
2077 r = complete_pio(vcpu);
2078 if (r)
2079 goto out;
2080 }
2081#if CONFIG_HAS_IOMEM
2082 if (vcpu->mmio_needed) {
2083 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
2084 vcpu->mmio_read_completed = 1;
2085 vcpu->mmio_needed = 0;
2086 r = emulate_instruction(vcpu, kvm_run,
2087 vcpu->mmio_fault_cr2, 0, 1);
2088 if (r == EMULATE_DO_MMIO) {
2089 /*
2090 * Read-modify-write. Back to userspace.
2091 */
2092 r = 0;
2093 goto out;
2094 }
2095 }
2096#endif
2097 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
2098 kvm_x86_ops->cache_regs(vcpu);
2099 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
2100 kvm_x86_ops->decache_regs(vcpu);
2101 }
2102
2103 r = __vcpu_run(vcpu, kvm_run);
2104
2105out:
2106 if (vcpu->sigset_active)
2107 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2108
2109 vcpu_put(vcpu);
2110 return r;
2111}
2112
2113int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2114{
2115 vcpu_load(vcpu);
2116
2117 kvm_x86_ops->cache_regs(vcpu);
2118
2119 regs->rax = vcpu->regs[VCPU_REGS_RAX];
2120 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
2121 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
2122 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
2123 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
2124 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
2125 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
2126 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
2127#ifdef CONFIG_X86_64
2128 regs->r8 = vcpu->regs[VCPU_REGS_R8];
2129 regs->r9 = vcpu->regs[VCPU_REGS_R9];
2130 regs->r10 = vcpu->regs[VCPU_REGS_R10];
2131 regs->r11 = vcpu->regs[VCPU_REGS_R11];
2132 regs->r12 = vcpu->regs[VCPU_REGS_R12];
2133 regs->r13 = vcpu->regs[VCPU_REGS_R13];
2134 regs->r14 = vcpu->regs[VCPU_REGS_R14];
2135 regs->r15 = vcpu->regs[VCPU_REGS_R15];
2136#endif
2137
2138 regs->rip = vcpu->rip;
2139 regs->rflags = kvm_x86_ops->get_rflags(vcpu);
2140
2141 /*
2142 * Don't leak debug flags in case they were set for guest debugging
2143 */
2144 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
2145 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
2146
2147 vcpu_put(vcpu);
2148
2149 return 0;
2150}
2151
2152int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2153{
2154 vcpu_load(vcpu);
2155
2156 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
2157 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
2158 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
2159 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
2160 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
2161 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
2162 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
2163 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
2164#ifdef CONFIG_X86_64
2165 vcpu->regs[VCPU_REGS_R8] = regs->r8;
2166 vcpu->regs[VCPU_REGS_R9] = regs->r9;
2167 vcpu->regs[VCPU_REGS_R10] = regs->r10;
2168 vcpu->regs[VCPU_REGS_R11] = regs->r11;
2169 vcpu->regs[VCPU_REGS_R12] = regs->r12;
2170 vcpu->regs[VCPU_REGS_R13] = regs->r13;
2171 vcpu->regs[VCPU_REGS_R14] = regs->r14;
2172 vcpu->regs[VCPU_REGS_R15] = regs->r15;
2173#endif
2174
2175 vcpu->rip = regs->rip;
2176 kvm_x86_ops->set_rflags(vcpu, regs->rflags);
2177
2178 kvm_x86_ops->decache_regs(vcpu);
2179
2180 vcpu_put(vcpu);
2181
2182 return 0;
2183}
2184
2185static void get_segment(struct kvm_vcpu *vcpu,
2186 struct kvm_segment *var, int seg)
2187{
2188 return kvm_x86_ops->get_segment(vcpu, var, seg);
2189}
2190
2191void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
2192{
2193 struct kvm_segment cs;
2194
2195 get_segment(vcpu, &cs, VCPU_SREG_CS);
2196 *db = cs.db;
2197 *l = cs.l;
2198}
2199EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
2200
2201int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2202 struct kvm_sregs *sregs)
2203{
2204 struct descriptor_table dt;
2205 int pending_vec;
2206
2207 vcpu_load(vcpu);
2208
2209 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2210 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2211 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2212 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2213 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2214 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2215
2216 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2217 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2218
2219 kvm_x86_ops->get_idt(vcpu, &dt);
2220 sregs->idt.limit = dt.limit;
2221 sregs->idt.base = dt.base;
2222 kvm_x86_ops->get_gdt(vcpu, &dt);
2223 sregs->gdt.limit = dt.limit;
2224 sregs->gdt.base = dt.base;
2225
2226 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2227 sregs->cr0 = vcpu->cr0;
2228 sregs->cr2 = vcpu->cr2;
2229 sregs->cr3 = vcpu->cr3;
2230 sregs->cr4 = vcpu->cr4;
2231 sregs->cr8 = get_cr8(vcpu);
2232 sregs->efer = vcpu->shadow_efer;
2233 sregs->apic_base = kvm_get_apic_base(vcpu);
2234
2235 if (irqchip_in_kernel(vcpu->kvm)) {
2236 memset(sregs->interrupt_bitmap, 0,
2237 sizeof sregs->interrupt_bitmap);
2238 pending_vec = kvm_x86_ops->get_irq(vcpu);
2239 if (pending_vec >= 0)
2240 set_bit(pending_vec,
2241 (unsigned long *)sregs->interrupt_bitmap);
2242 } else
2243 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2244 sizeof sregs->interrupt_bitmap);
2245
2246 vcpu_put(vcpu);
2247
2248 return 0;
2249}
2250
2251static void set_segment(struct kvm_vcpu *vcpu,
2252 struct kvm_segment *var, int seg)
2253{
2254 return kvm_x86_ops->set_segment(vcpu, var, seg);
2255}
2256
2257int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2258 struct kvm_sregs *sregs)
2259{
2260 int mmu_reset_needed = 0;
2261 int i, pending_vec, max_bits;
2262 struct descriptor_table dt;
2263
2264 vcpu_load(vcpu);
2265
2266 dt.limit = sregs->idt.limit;
2267 dt.base = sregs->idt.base;
2268 kvm_x86_ops->set_idt(vcpu, &dt);
2269 dt.limit = sregs->gdt.limit;
2270 dt.base = sregs->gdt.base;
2271 kvm_x86_ops->set_gdt(vcpu, &dt);
2272
2273 vcpu->cr2 = sregs->cr2;
2274 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2275 vcpu->cr3 = sregs->cr3;
2276
2277 set_cr8(vcpu, sregs->cr8);
2278
2279 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
2280#ifdef CONFIG_X86_64
2281 kvm_x86_ops->set_efer(vcpu, sregs->efer);
2282#endif
2283 kvm_set_apic_base(vcpu, sregs->apic_base);
2284
2285 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2286
2287 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
2288 vcpu->cr0 = sregs->cr0;
2289 kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
2290
2291 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2292 kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
2293 if (!is_long_mode(vcpu) && is_pae(vcpu))
2294 load_pdptrs(vcpu, vcpu->cr3);
2295
2296 if (mmu_reset_needed)
2297 kvm_mmu_reset_context(vcpu);
2298
2299 if (!irqchip_in_kernel(vcpu->kvm)) {
2300 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2301 sizeof vcpu->irq_pending);
2302 vcpu->irq_summary = 0;
2303 for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i)
2304 if (vcpu->irq_pending[i])
2305 __set_bit(i, &vcpu->irq_summary);
2306 } else {
2307 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
2308 pending_vec = find_first_bit(
2309 (const unsigned long *)sregs->interrupt_bitmap,
2310 max_bits);
2311 /* Only pending external irq is handled here */
2312 if (pending_vec < max_bits) {
2313 kvm_x86_ops->set_irq(vcpu, pending_vec);
2314 pr_debug("Set back pending irq %d\n",
2315 pending_vec);
2316 }
2317 }
2318
2319 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2320 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2321 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2322 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2323 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2324 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2325
2326 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2327 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2328
2329 vcpu_put(vcpu);
2330
2331 return 0;
2332}
2333
2334int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2335 struct kvm_debug_guest *dbg)
2336{
2337 int r;
2338
2339 vcpu_load(vcpu);
2340
2341 r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
2342
2343 vcpu_put(vcpu);
2344
2345 return r;
2346}
2347
d0752060
HB		 2348/*
2349 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2350 * we have asm/x86/processor.h
2351 */
2352struct fxsave {
2353 u16 cwd;
2354 u16 swd;
2355 u16 twd;
2356 u16 fop;
2357 u64 rip;
2358 u64 rdp;
2359 u32 mxcsr;
2360 u32 mxcsr_mask;
2361 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2362#ifdef CONFIG_X86_64
2363 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2364#else
2365 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2366#endif
2367};
2368
8b006791
ZX		 2369/*
2370 * Translate a guest virtual address to a guest physical address.
2371 */
2372int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2373 struct kvm_translation *tr)
2374{
2375 unsigned long vaddr = tr->linear_address;
2376 gpa_t gpa;
2377
2378 vcpu_load(vcpu);
2379 mutex_lock(&vcpu->kvm->lock);
2380 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2381 tr->physical_address = gpa;
2382 tr->valid = gpa != UNMAPPED_GVA;
2383 tr->writeable = 1;
2384 tr->usermode = 0;
2385 mutex_unlock(&vcpu->kvm->lock);
2386 vcpu_put(vcpu);
2387
2388 return 0;
2389}
2390
d0752060
HB		 2391int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2392{
2393 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2394
2395 vcpu_load(vcpu);
2396
2397 memcpy(fpu->fpr, fxsave->st_space, 128);
2398 fpu->fcw = fxsave->cwd;
2399 fpu->fsw = fxsave->swd;
2400 fpu->ftwx = fxsave->twd;
2401 fpu->last_opcode = fxsave->fop;
2402 fpu->last_ip = fxsave->rip;
2403 fpu->last_dp = fxsave->rdp;
2404 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2405
2406 vcpu_put(vcpu);
2407
2408 return 0;
2409}
2410
2411int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2412{
2413 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2414
2415 vcpu_load(vcpu);
2416
2417 memcpy(fxsave->st_space, fpu->fpr, 128);
2418 fxsave->cwd = fpu->fcw;
2419 fxsave->swd = fpu->fsw;
2420 fxsave->twd = fpu->ftwx;
2421 fxsave->fop = fpu->last_opcode;
2422 fxsave->rip = fpu->last_ip;
2423 fxsave->rdp = fpu->last_dp;
2424 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2425
2426 vcpu_put(vcpu);
2427
2428 return 0;
2429}
2430
2431void fx_init(struct kvm_vcpu *vcpu)
2432{
2433 unsigned after_mxcsr_mask;
2434
2435 /* Initialize guest FPU by resetting ours and saving into guest's */
2436 preempt_disable();
2437 fx_save(&vcpu->host_fx_image);
2438 fpu_init();
2439 fx_save(&vcpu->guest_fx_image);
2440 fx_restore(&vcpu->host_fx_image);
2441 preempt_enable();
2442
2443 vcpu->cr0 |= X86_CR0_ET;
2444 after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
2445 vcpu->guest_fx_image.mxcsr = 0x1f80;
2446 memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask,
2447 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
2448}
2449EXPORT_SYMBOL_GPL(fx_init);
2450
2451void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
2452{
2453 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
2454 return;
2455
2456 vcpu->guest_fpu_loaded = 1;
2457 fx_save(&vcpu->host_fx_image);
2458 fx_restore(&vcpu->guest_fx_image);
2459}
2460EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
2461
2462void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
2463{
2464 if (!vcpu->guest_fpu_loaded)
2465 return;
2466
2467 vcpu->guest_fpu_loaded = 0;
2468 fx_save(&vcpu->guest_fx_image);
2469 fx_restore(&vcpu->host_fx_image);
f096ed85 2470 ++vcpu->stat.fpu_reload;
d0752060
HB		 2471}
2472EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
e9b11c17
ZX		 2473
2474void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
2475{
2476 kvm_x86_ops->vcpu_free(vcpu);
2477}
2478
2479struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
2480 unsigned int id)
2481{
26e5215f
AK		 2482 return kvm_x86_ops->vcpu_create(kvm, id);
2483}
e9b11c17 2484
26e5215f
AK		 2485int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
2486{
2487 int r;
e9b11c17
ZX		 2488
2489 /* We do fxsave: this must be aligned. */
2490 BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
2491
2492 vcpu_load(vcpu);
2493 r = kvm_arch_vcpu_reset(vcpu);
2494 if (r == 0)
2495 r = kvm_mmu_setup(vcpu);
2496 vcpu_put(vcpu);
2497 if (r < 0)
2498 goto free_vcpu;
2499
26e5215f 2500 return 0;
e9b11c17
ZX		 2501free_vcpu:
2502 kvm_x86_ops->vcpu_free(vcpu);
26e5215f 2503 return r;
e9b11c17
ZX		 2504}
2505
d40ccc62 2506void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
e9b11c17
ZX		 2507{
2508 vcpu_load(vcpu);
2509 kvm_mmu_unload(vcpu);
2510 vcpu_put(vcpu);
2511
2512 kvm_x86_ops->vcpu_free(vcpu);
2513}
2514
2515int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
2516{
2517 return kvm_x86_ops->vcpu_reset(vcpu);
2518}
2519
2520void kvm_arch_hardware_enable(void *garbage)
2521{
2522 kvm_x86_ops->hardware_enable(garbage);
2523}
2524
2525void kvm_arch_hardware_disable(void *garbage)
2526{
2527 kvm_x86_ops->hardware_disable(garbage);
2528}
2529
2530int kvm_arch_hardware_setup(void)
2531{
2532 return kvm_x86_ops->hardware_setup();
2533}
2534
2535void kvm_arch_hardware_unsetup(void)
2536{
2537 kvm_x86_ops->hardware_unsetup();
2538}
2539
2540void kvm_arch_check_processor_compat(void *rtn)
2541{
2542 kvm_x86_ops->check_processor_compatibility(rtn);
2543}
2544
2545int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
2546{
2547 struct page *page;
2548 struct kvm *kvm;
2549 int r;
2550
2551 BUG_ON(vcpu->kvm == NULL);
2552 kvm = vcpu->kvm;
2553
2554 vcpu->mmu.root_hpa = INVALID_PAGE;
2555 if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
2556 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
2557 else
2558 vcpu->mp_state = VCPU_MP_STATE_UNINITIALIZED;
2559
2560 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2561 if (!page) {
2562 r = -ENOMEM;
2563 goto fail;
2564 }
2565 vcpu->pio_data = page_address(page);
2566
2567 r = kvm_mmu_create(vcpu);
2568 if (r < 0)
2569 goto fail_free_pio_data;
2570
2571 if (irqchip_in_kernel(kvm)) {
2572 r = kvm_create_lapic(vcpu);
2573 if (r < 0)
2574 goto fail_mmu_destroy;
2575 }
2576
2577 return 0;
2578
2579fail_mmu_destroy:
2580 kvm_mmu_destroy(vcpu);
2581fail_free_pio_data:
2582 free_page((unsigned long)vcpu->pio_data);
2583fail:
2584 return r;
2585}
2586
2587void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
2588{
2589 kvm_free_lapic(vcpu);
2590 kvm_mmu_destroy(vcpu);
2591 free_page((unsigned long)vcpu->pio_data);
2592}
d19a9cd2
ZX		 2593
2594struct kvm *kvm_arch_create_vm(void)
2595{
2596 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
2597
2598 if (!kvm)
2599 return ERR_PTR(-ENOMEM);
2600
2601 INIT_LIST_HEAD(&kvm->active_mmu_pages);
2602
2603 return kvm;
2604}
2605
2606static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
2607{
2608 vcpu_load(vcpu);
2609 kvm_mmu_unload(vcpu);
2610 vcpu_put(vcpu);
2611}
2612
2613static void kvm_free_vcpus(struct kvm *kvm)
2614{
2615 unsigned int i;
2616
2617 /*
2618 * Unpin any mmu pages first.
2619 */
2620 for (i = 0; i < KVM_MAX_VCPUS; ++i)
2621 if (kvm->vcpus[i])
2622 kvm_unload_vcpu_mmu(kvm->vcpus[i]);
2623 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2624 if (kvm->vcpus[i]) {
2625 kvm_arch_vcpu_free(kvm->vcpus[i]);
2626 kvm->vcpus[i] = NULL;
2627 }
2628 }
2629
2630}
2631
2632void kvm_arch_destroy_vm(struct kvm *kvm)
2633{
2634 kfree(kvm->vpic);
2635 kfree(kvm->vioapic);
2636 kvm_free_vcpus(kvm);
2637 kvm_free_physmem(kvm);
2638 kfree(kvm);
2639}
0de10343
ZX		 2640
2641int kvm_arch_set_memory_region(struct kvm *kvm,
2642 struct kvm_userspace_memory_region *mem,
2643 struct kvm_memory_slot old,
2644 int user_alloc)
2645{
2646 int npages = mem->memory_size >> PAGE_SHIFT;
2647 struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot];
2648
2649 /*To keep backward compatibility with older userspace,
2650 *x86 needs to hanlde !user_alloc case.
2651 */
2652 if (!user_alloc) {
2653 if (npages && !old.rmap) {
2654 down_write(&current->mm->mmap_sem);
2655 memslot->userspace_addr = do_mmap(NULL, 0,
2656 npages * PAGE_SIZE,
2657 PROT_READ | PROT_WRITE,
2658 MAP_SHARED | MAP_ANONYMOUS,
2659 0);
2660 up_write(&current->mm->mmap_sem);
2661
2662 if (IS_ERR((void *)memslot->userspace_addr))
2663 return PTR_ERR((void *)memslot->userspace_addr);
2664 } else {
2665 if (!old.user_alloc && old.rmap) {
2666 int ret;
2667
2668 down_write(&current->mm->mmap_sem);
2669 ret = do_munmap(current->mm, old.userspace_addr,
2670 old.npages * PAGE_SIZE);
2671 up_write(&current->mm->mmap_sem);
2672 if (ret < 0)
2673 printk(KERN_WARNING
2674 "kvm_vm_ioctl_set_memory_region: "
2675 "failed to munmap memory\n");
2676 }
2677 }
2678 }
2679
2680 if (!kvm->n_requested_mmu_pages) {
2681 unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
2682 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
2683 }
2684
2685 kvm_mmu_slot_remove_write_access(kvm, mem->slot);
2686 kvm_flush_remote_tlbs(kvm);
2687
2688 return 0;
2689}
Linux kernel - Deliverables
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