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KVM: Handle virtualization instruction #UD faults during reboot
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / x86 / kvm / vmx.c
blobb80b4d1416374997cbd8efb563dd37993b056c09
1 /*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
8 *
9 * Authors:
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
12 *
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
15 *
16 */
17
18 #include "irq.h"
19 #include "vmx.h"
20 #include "mmu.h"
21
22 #include <linux/kvm_host.h>
23 #include <linux/module.h>
24 #include <linux/kernel.h>
25 #include <linux/mm.h>
26 #include <linux/highmem.h>
27 #include <linux/sched.h>
28 #include <linux/moduleparam.h>
29
30 #include <asm/io.h>
31 #include <asm/desc.h>
32
33 #define __ex(x) __kvm_handle_fault_on_reboot(x)
34
35 MODULE_AUTHOR("Qumranet");
36 MODULE_LICENSE("GPL");
37
38 static int bypass_guest_pf = 1;
39 module_param(bypass_guest_pf, bool, 0);
40
41 static int enable_vpid = 1;
42 module_param(enable_vpid, bool, 0);
43
44 static int flexpriority_enabled = 1;
45 module_param(flexpriority_enabled, bool, 0);
46
47 static int enable_ept = 1;
48 module_param(enable_ept, bool, 0);
49
50 struct vmcs {
51 u32 revision_id;
52 u32 abort;
53 char data[0];
54 };
55
56 struct vcpu_vmx {
57 struct kvm_vcpu vcpu;
58 int launched;
59 u8 fail;
60 u32 idt_vectoring_info;
61 struct kvm_msr_entry *guest_msrs;
62 struct kvm_msr_entry *host_msrs;
63 int nmsrs;
64 int save_nmsrs;
65 int msr_offset_efer;
66 #ifdef CONFIG_X86_64
67 int msr_offset_kernel_gs_base;
68 #endif
69 struct vmcs *vmcs;
70 struct {
71 int loaded;
72 u16 fs_sel, gs_sel, ldt_sel;
73 int gs_ldt_reload_needed;
74 int fs_reload_needed;
75 int guest_efer_loaded;
76 } host_state;
77 struct {
78 struct {
79 bool pending;
80 u8 vector;
81 unsigned rip;
82 } irq;
83 } rmode;
84 int vpid;
85 };
86
87 static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
88 {
89 return container_of(vcpu, struct vcpu_vmx, vcpu);
90 }
91
92 static int init_rmode(struct kvm *kvm);
93
94 static DEFINE_PER_CPU(struct vmcs *, vmxarea);
95 static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
96
97 static struct page *vmx_io_bitmap_a;
98 static struct page *vmx_io_bitmap_b;
99 static struct page *vmx_msr_bitmap;
100
101 static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS);
102 static DEFINE_SPINLOCK(vmx_vpid_lock);
103
104 static struct vmcs_config {
105 int size;
106 int order;
107 u32 revision_id;
108 u32 pin_based_exec_ctrl;
109 u32 cpu_based_exec_ctrl;
110 u32 cpu_based_2nd_exec_ctrl;
111 u32 vmexit_ctrl;
112 u32 vmentry_ctrl;
113 } vmcs_config;
114
115 struct vmx_capability {
116 u32 ept;
117 u32 vpid;
118 } vmx_capability;
119
120 #define VMX_SEGMENT_FIELD(seg) \
121 [VCPU_SREG_##seg] = { \
122 .selector = GUEST_##seg##_SELECTOR, \
123 .base = GUEST_##seg##_BASE, \
124 .limit = GUEST_##seg##_LIMIT, \
125 .ar_bytes = GUEST_##seg##_AR_BYTES, \
126 }
127
128 static struct kvm_vmx_segment_field {
129 unsigned selector;
130 unsigned base;
131 unsigned limit;
132 unsigned ar_bytes;
133 } kvm_vmx_segment_fields[] = {
134 VMX_SEGMENT_FIELD(CS),
135 VMX_SEGMENT_FIELD(DS),
136 VMX_SEGMENT_FIELD(ES),
137 VMX_SEGMENT_FIELD(FS),
138 VMX_SEGMENT_FIELD(GS),
139 VMX_SEGMENT_FIELD(SS),
140 VMX_SEGMENT_FIELD(TR),
141 VMX_SEGMENT_FIELD(LDTR),
142 };
143
144 /*
145 * Keep MSR_K6_STAR at the end, as setup_msrs() will try to optimize it
146 * away by decrementing the array size.
147 */
148 static const u32 vmx_msr_index[] = {
149 #ifdef CONFIG_X86_64
150 MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, MSR_KERNEL_GS_BASE,
151 #endif
152 MSR_EFER, MSR_K6_STAR,
153 };
154 #define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
155
156 static void load_msrs(struct kvm_msr_entry *e, int n)
157 {
158 int i;
159
160 for (i = 0; i < n; ++i)
161 wrmsrl(e[i].index, e[i].data);
162 }
163
164 static void save_msrs(struct kvm_msr_entry *e, int n)
165 {
166 int i;
167
168 for (i = 0; i < n; ++i)
169 rdmsrl(e[i].index, e[i].data);
170 }
171
172 static inline int is_page_fault(u32 intr_info)
173 {
174 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
175 INTR_INFO_VALID_MASK)) ==
176 (INTR_TYPE_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
177 }
178
179 static inline int is_no_device(u32 intr_info)
180 {
181 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
182 INTR_INFO_VALID_MASK)) ==
183 (INTR_TYPE_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
184 }
185
186 static inline int is_invalid_opcode(u32 intr_info)
187 {
188 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
189 INTR_INFO_VALID_MASK)) ==
190 (INTR_TYPE_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
191 }
192
193 static inline int is_external_interrupt(u32 intr_info)
194 {
195 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
196 == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
197 }
198
199 static inline int cpu_has_vmx_msr_bitmap(void)
200 {
201 return (vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS);
202 }
203
204 static inline int cpu_has_vmx_tpr_shadow(void)
205 {
206 return (vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW);
207 }
208
209 static inline int vm_need_tpr_shadow(struct kvm *kvm)
210 {
211 return ((cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm)));
212 }
213
214 static inline int cpu_has_secondary_exec_ctrls(void)
215 {
216 return (vmcs_config.cpu_based_exec_ctrl &
217 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS);
218 }
219
220 static inline bool cpu_has_vmx_virtualize_apic_accesses(void)
221 {
222 return flexpriority_enabled
223 && (vmcs_config.cpu_based_2nd_exec_ctrl &
224 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES);
225 }
226
227 static inline int cpu_has_vmx_invept_individual_addr(void)
228 {
229 return (!!(vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT));
230 }
231
232 static inline int cpu_has_vmx_invept_context(void)
233 {
234 return (!!(vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT));
235 }
236
237 static inline int cpu_has_vmx_invept_global(void)
238 {
239 return (!!(vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT));
240 }
241
242 static inline int cpu_has_vmx_ept(void)
243 {
244 return (vmcs_config.cpu_based_2nd_exec_ctrl &
245 SECONDARY_EXEC_ENABLE_EPT);
246 }
247
248 static inline int vm_need_ept(void)
249 {
250 return (cpu_has_vmx_ept() && enable_ept);
251 }
252
253 static inline int vm_need_virtualize_apic_accesses(struct kvm *kvm)
254 {
255 return ((cpu_has_vmx_virtualize_apic_accesses()) &&
256 (irqchip_in_kernel(kvm)));
257 }
258
259 static inline int cpu_has_vmx_vpid(void)
260 {
261 return (vmcs_config.cpu_based_2nd_exec_ctrl &
262 SECONDARY_EXEC_ENABLE_VPID);
263 }
264
265 static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr)
266 {
267 int i;
268
269 for (i = 0; i < vmx->nmsrs; ++i)
270 if (vmx->guest_msrs[i].index == msr)
271 return i;
272 return -1;
273 }
274
275 static inline void __invvpid(int ext, u16 vpid, gva_t gva)
276 {
277 struct {
278 u64 vpid : 16;
279 u64 rsvd : 48;
280 u64 gva;
281 } operand = { vpid, 0, gva };
282
283 asm volatile (__ex(ASM_VMX_INVVPID)
284 /* CF==1 or ZF==1 --> rc = -1 */
285 "; ja 1f ; ud2 ; 1:"
286 : : "a"(&operand), "c"(ext) : "cc", "memory");
287 }
288
289 static inline void __invept(int ext, u64 eptp, gpa_t gpa)
290 {
291 struct {
292 u64 eptp, gpa;
293 } operand = {eptp, gpa};
294
295 asm volatile (__ex(ASM_VMX_INVEPT)
296 /* CF==1 or ZF==1 --> rc = -1 */
297 "; ja 1f ; ud2 ; 1:\n"
298 : : "a" (&operand), "c" (ext) : "cc", "memory");
299 }
300
301 static struct kvm_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr)
302 {
303 int i;
304
305 i = __find_msr_index(vmx, msr);
306 if (i >= 0)
307 return &vmx->guest_msrs[i];
308 return NULL;
309 }
310
311 static void vmcs_clear(struct vmcs *vmcs)
312 {
313 u64 phys_addr = __pa(vmcs);
314 u8 error;
315
316 asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) "; setna %0"
317 : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
318 : "cc", "memory");
319 if (error)
320 printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
321 vmcs, phys_addr);
322 }
323
324 static void __vcpu_clear(void *arg)
325 {
326 struct vcpu_vmx *vmx = arg;
327 int cpu = raw_smp_processor_id();
328
329 if (vmx->vcpu.cpu == cpu)
330 vmcs_clear(vmx->vmcs);
331 if (per_cpu(current_vmcs, cpu) == vmx->vmcs)
332 per_cpu(current_vmcs, cpu) = NULL;
333 rdtscll(vmx->vcpu.arch.host_tsc);
334 }
335
336 static void vcpu_clear(struct vcpu_vmx *vmx)
337 {
338 if (vmx->vcpu.cpu == -1)
339 return;
340 smp_call_function_single(vmx->vcpu.cpu, __vcpu_clear, vmx, 1);
341 vmx->launched = 0;
342 }
343
344 static inline void vpid_sync_vcpu_all(struct vcpu_vmx *vmx)
345 {
346 if (vmx->vpid == 0)
347 return;
348
349 __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0);
350 }
351
352 static inline void ept_sync_global(void)
353 {
354 if (cpu_has_vmx_invept_global())
355 __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
356 }
357
358 static inline void ept_sync_context(u64 eptp)
359 {
360 if (vm_need_ept()) {
361 if (cpu_has_vmx_invept_context())
362 __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
363 else
364 ept_sync_global();
365 }
366 }
367
368 static inline void ept_sync_individual_addr(u64 eptp, gpa_t gpa)
369 {
370 if (vm_need_ept()) {
371 if (cpu_has_vmx_invept_individual_addr())
372 __invept(VMX_EPT_EXTENT_INDIVIDUAL_ADDR,
373 eptp, gpa);
374 else
375 ept_sync_context(eptp);
376 }
377 }
378
379 static unsigned long vmcs_readl(unsigned long field)
380 {
381 unsigned long value;
382
383 asm volatile (__ex(ASM_VMX_VMREAD_RDX_RAX)
384 : "=a"(value) : "d"(field) : "cc");
385 return value;
386 }
387
388 static u16 vmcs_read16(unsigned long field)
389 {
390 return vmcs_readl(field);
391 }
392
393 static u32 vmcs_read32(unsigned long field)
394 {
395 return vmcs_readl(field);
396 }
397
398 static u64 vmcs_read64(unsigned long field)
399 {
400 #ifdef CONFIG_X86_64
401 return vmcs_readl(field);
402 #else
403 return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
404 #endif
405 }
406
407 static noinline void vmwrite_error(unsigned long field, unsigned long value)
408 {
409 printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
410 field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
411 dump_stack();
412 }
413
414 static void vmcs_writel(unsigned long field, unsigned long value)
415 {
416 u8 error;
417
418 asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) "; setna %0"
419 : "=q"(error) : "a"(value), "d"(field) : "cc");
420 if (unlikely(error))
421 vmwrite_error(field, value);
422 }
423
424 static void vmcs_write16(unsigned long field, u16 value)
425 {
426 vmcs_writel(field, value);
427 }
428
429 static void vmcs_write32(unsigned long field, u32 value)
430 {
431 vmcs_writel(field, value);
432 }
433
434 static void vmcs_write64(unsigned long field, u64 value)
435 {
436 vmcs_writel(field, value);
437 #ifndef CONFIG_X86_64
438 asm volatile ("");
439 vmcs_writel(field+1, value >> 32);
440 #endif
441 }
442
443 static void vmcs_clear_bits(unsigned long field, u32 mask)
444 {
445 vmcs_writel(field, vmcs_readl(field) & ~mask);
446 }
447
448 static void vmcs_set_bits(unsigned long field, u32 mask)
449 {
450 vmcs_writel(field, vmcs_readl(field) | mask);
451 }
452
453 static void update_exception_bitmap(struct kvm_vcpu *vcpu)
454 {
455 u32 eb;
456
457 eb = (1u << PF_VECTOR) | (1u << UD_VECTOR);
458 if (!vcpu->fpu_active)
459 eb |= 1u << NM_VECTOR;
460 if (vcpu->guest_debug.enabled)
461 eb |= 1u << 1;
462 if (vcpu->arch.rmode.active)
463 eb = ~0;
464 if (vm_need_ept())
465 eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */
466 vmcs_write32(EXCEPTION_BITMAP, eb);
467 }
468
469 static void reload_tss(void)
470 {
471 /*
472 * VT restores TR but not its size. Useless.
473 */
474 struct descriptor_table gdt;
475 struct desc_struct *descs;
476
477 get_gdt(&gdt);
478 descs = (void *)gdt.base;
479 descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
480 load_TR_desc();
481 }
482
483 static void load_transition_efer(struct vcpu_vmx *vmx)
484 {
485 int efer_offset = vmx->msr_offset_efer;
486 u64 host_efer = vmx->host_msrs[efer_offset].data;
487 u64 guest_efer = vmx->guest_msrs[efer_offset].data;
488 u64 ignore_bits;
489
490 if (efer_offset < 0)
491 return;
492 /*
493 * NX is emulated; LMA and LME handled by hardware; SCE meaninless
494 * outside long mode
495 */
496 ignore_bits = EFER_NX | EFER_SCE;
497 #ifdef CONFIG_X86_64
498 ignore_bits |= EFER_LMA | EFER_LME;
499 /* SCE is meaningful only in long mode on Intel */
500 if (guest_efer & EFER_LMA)
501 ignore_bits &= ~(u64)EFER_SCE;
502 #endif
503 if ((guest_efer & ~ignore_bits) == (host_efer & ~ignore_bits))
504 return;
505
506 vmx->host_state.guest_efer_loaded = 1;
507 guest_efer &= ~ignore_bits;
508 guest_efer |= host_efer & ignore_bits;
509 wrmsrl(MSR_EFER, guest_efer);
510 vmx->vcpu.stat.efer_reload++;
511 }
512
513 static void reload_host_efer(struct vcpu_vmx *vmx)
514 {
515 if (vmx->host_state.guest_efer_loaded) {
516 vmx->host_state.guest_efer_loaded = 0;
517 load_msrs(vmx->host_msrs + vmx->msr_offset_efer, 1);
518 }
519 }
520
521 static void vmx_save_host_state(struct kvm_vcpu *vcpu)
522 {
523 struct vcpu_vmx *vmx = to_vmx(vcpu);
524
525 if (vmx->host_state.loaded)
526 return;
527
528 vmx->host_state.loaded = 1;
529 /*
530 * Set host fs and gs selectors. Unfortunately, 22.2.3 does not
531 * allow segment selectors with cpl > 0 or ti == 1.
532 */
533 vmx->host_state.ldt_sel = read_ldt();
534 vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;
535 vmx->host_state.fs_sel = read_fs();
536 if (!(vmx->host_state.fs_sel & 7)) {
537 vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
538 vmx->host_state.fs_reload_needed = 0;
539 } else {
540 vmcs_write16(HOST_FS_SELECTOR, 0);
541 vmx->host_state.fs_reload_needed = 1;
542 }
543 vmx->host_state.gs_sel = read_gs();
544 if (!(vmx->host_state.gs_sel & 7))
545 vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel);
546 else {
547 vmcs_write16(HOST_GS_SELECTOR, 0);
548 vmx->host_state.gs_ldt_reload_needed = 1;
549 }
550
551 #ifdef CONFIG_X86_64
552 vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
553 vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
554 #else
555 vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
556 vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
557 #endif
558
559 #ifdef CONFIG_X86_64
560 if (is_long_mode(&vmx->vcpu))
561 save_msrs(vmx->host_msrs +
562 vmx->msr_offset_kernel_gs_base, 1);
563
564 #endif
565 load_msrs(vmx->guest_msrs, vmx->save_nmsrs);
566 load_transition_efer(vmx);
567 }
568
569 static void __vmx_load_host_state(struct vcpu_vmx *vmx)
570 {
571 unsigned long flags;
572
573 if (!vmx->host_state.loaded)
574 return;
575
576 ++vmx->vcpu.stat.host_state_reload;
577 vmx->host_state.loaded = 0;
578 if (vmx->host_state.fs_reload_needed)
579 load_fs(vmx->host_state.fs_sel);
580 if (vmx->host_state.gs_ldt_reload_needed) {
581 load_ldt(vmx->host_state.ldt_sel);
582 /*
583 * If we have to reload gs, we must take care to
584 * preserve our gs base.
585 */
586 local_irq_save(flags);
587 load_gs(vmx->host_state.gs_sel);
588 #ifdef CONFIG_X86_64
589 wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
590 #endif
591 local_irq_restore(flags);
592 }
593 reload_tss();
594 save_msrs(vmx->guest_msrs, vmx->save_nmsrs);
595 load_msrs(vmx->host_msrs, vmx->save_nmsrs);
596 reload_host_efer(vmx);
597 }
598
599 static void vmx_load_host_state(struct vcpu_vmx *vmx)
600 {
601 preempt_disable();
602 __vmx_load_host_state(vmx);
603 preempt_enable();
604 }
605
606 /*
607 * Switches to specified vcpu, until a matching vcpu_put(), but assumes
608 * vcpu mutex is already taken.
609 */
610 static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
611 {
612 struct vcpu_vmx *vmx = to_vmx(vcpu);
613 u64 phys_addr = __pa(vmx->vmcs);
614 u64 tsc_this, delta, new_offset;
615
616 if (vcpu->cpu != cpu) {
617 vcpu_clear(vmx);
618 kvm_migrate_timers(vcpu);
619 vpid_sync_vcpu_all(vmx);
620 }
621
622 if (per_cpu(current_vmcs, cpu) != vmx->vmcs) {
623 u8 error;
624
625 per_cpu(current_vmcs, cpu) = vmx->vmcs;
626 asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
627 : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
628 : "cc");
629 if (error)
630 printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
631 vmx->vmcs, phys_addr);
632 }
633
634 if (vcpu->cpu != cpu) {
635 struct descriptor_table dt;
636 unsigned long sysenter_esp;
637
638 vcpu->cpu = cpu;
639 /*
640 * Linux uses per-cpu TSS and GDT, so set these when switching
641 * processors.
642 */
643 vmcs_writel(HOST_TR_BASE, read_tr_base()); /* 22.2.4 */
644 get_gdt(&dt);
645 vmcs_writel(HOST_GDTR_BASE, dt.base); /* 22.2.4 */
646
647 rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
648 vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
649
650 /*
651 * Make sure the time stamp counter is monotonous.
652 */
653 rdtscll(tsc_this);
654 if (tsc_this < vcpu->arch.host_tsc) {
655 delta = vcpu->arch.host_tsc - tsc_this;
656 new_offset = vmcs_read64(TSC_OFFSET) + delta;
657 vmcs_write64(TSC_OFFSET, new_offset);
658 }
659 }
660 }
661
662 static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
663 {
664 __vmx_load_host_state(to_vmx(vcpu));
665 }
666
667 static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
668 {
669 if (vcpu->fpu_active)
670 return;
671 vcpu->fpu_active = 1;
672 vmcs_clear_bits(GUEST_CR0, X86_CR0_TS);
673 if (vcpu->arch.cr0 & X86_CR0_TS)
674 vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
675 update_exception_bitmap(vcpu);
676 }
677
678 static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
679 {
680 if (!vcpu->fpu_active)
681 return;
682 vcpu->fpu_active = 0;
683 vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
684 update_exception_bitmap(vcpu);
685 }
686
687 static void vmx_vcpu_decache(struct kvm_vcpu *vcpu)
688 {
689 vcpu_clear(to_vmx(vcpu));
690 }
691
692 static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
693 {
694 return vmcs_readl(GUEST_RFLAGS);
695 }
696
697 static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
698 {
699 if (vcpu->arch.rmode.active)
700 rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
701 vmcs_writel(GUEST_RFLAGS, rflags);
702 }
703
704 static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
705 {
706 unsigned long rip;
707 u32 interruptibility;
708
709 rip = vmcs_readl(GUEST_RIP);
710 rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
711 vmcs_writel(GUEST_RIP, rip);
712
713 /*
714 * We emulated an instruction, so temporary interrupt blocking
715 * should be removed, if set.
716 */
717 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
718 if (interruptibility & 3)
719 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
720 interruptibility & ~3);
721 vcpu->arch.interrupt_window_open = 1;
722 }
723
724 static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
725 bool has_error_code, u32 error_code)
726 {
727 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
728 nr | INTR_TYPE_EXCEPTION
729 | (has_error_code ? INTR_INFO_DELIVER_CODE_MASK : 0)
730 | INTR_INFO_VALID_MASK);
731 if (has_error_code)
732 vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
733 }
734
735 static bool vmx_exception_injected(struct kvm_vcpu *vcpu)
736 {
737 struct vcpu_vmx *vmx = to_vmx(vcpu);
738
739 return !(vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK);
740 }
741
742 /*
743 * Swap MSR entry in host/guest MSR entry array.
744 */
745 #ifdef CONFIG_X86_64
746 static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
747 {
748 struct kvm_msr_entry tmp;
749
750 tmp = vmx->guest_msrs[to];
751 vmx->guest_msrs[to] = vmx->guest_msrs[from];
752 vmx->guest_msrs[from] = tmp;
753 tmp = vmx->host_msrs[to];
754 vmx->host_msrs[to] = vmx->host_msrs[from];
755 vmx->host_msrs[from] = tmp;
756 }
757 #endif
758
759 /*
760 * Set up the vmcs to automatically save and restore system
761 * msrs. Don't touch the 64-bit msrs if the guest is in legacy
762 * mode, as fiddling with msrs is very expensive.
763 */
764 static void setup_msrs(struct vcpu_vmx *vmx)
765 {
766 int save_nmsrs;
767
768 vmx_load_host_state(vmx);
769 save_nmsrs = 0;
770 #ifdef CONFIG_X86_64
771 if (is_long_mode(&vmx->vcpu)) {
772 int index;
773
774 index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
775 if (index >= 0)
776 move_msr_up(vmx, index, save_nmsrs++);
777 index = __find_msr_index(vmx, MSR_LSTAR);
778 if (index >= 0)
779 move_msr_up(vmx, index, save_nmsrs++);
780 index = __find_msr_index(vmx, MSR_CSTAR);
781 if (index >= 0)
782 move_msr_up(vmx, index, save_nmsrs++);
783 index = __find_msr_index(vmx, MSR_KERNEL_GS_BASE);
784 if (index >= 0)
785 move_msr_up(vmx, index, save_nmsrs++);
786 /*
787 * MSR_K6_STAR is only needed on long mode guests, and only
788 * if efer.sce is enabled.
789 */
790 index = __find_msr_index(vmx, MSR_K6_STAR);
791 if ((index >= 0) && (vmx->vcpu.arch.shadow_efer & EFER_SCE))
792 move_msr_up(vmx, index, save_nmsrs++);
793 }
794 #endif
795 vmx->save_nmsrs = save_nmsrs;
796
797 #ifdef CONFIG_X86_64
798 vmx->msr_offset_kernel_gs_base =
799 __find_msr_index(vmx, MSR_KERNEL_GS_BASE);
800 #endif
801 vmx->msr_offset_efer = __find_msr_index(vmx, MSR_EFER);
802 }
803
804 /*
805 * reads and returns guest's timestamp counter "register"
806 * guest_tsc = host_tsc + tsc_offset -- 21.3
807 */
808 static u64 guest_read_tsc(void)
809 {
810 u64 host_tsc, tsc_offset;
811
812 rdtscll(host_tsc);
813 tsc_offset = vmcs_read64(TSC_OFFSET);
814 return host_tsc + tsc_offset;
815 }
816
817 /*
818 * writes 'guest_tsc' into guest's timestamp counter "register"
819 * guest_tsc = host_tsc + tsc_offset ==> tsc_offset = guest_tsc - host_tsc
820 */
821 static void guest_write_tsc(u64 guest_tsc)
822 {
823 u64 host_tsc;
824
825 rdtscll(host_tsc);
826 vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc);
827 }
828
829 /*
830 * Reads an msr value (of 'msr_index') into 'pdata'.
831 * Returns 0 on success, non-0 otherwise.
832 * Assumes vcpu_load() was already called.
833 */
834 static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
835 {
836 u64 data;
837 struct kvm_msr_entry *msr;
838
839 if (!pdata) {
840 printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
841 return -EINVAL;
842 }
843
844 switch (msr_index) {
845 #ifdef CONFIG_X86_64
846 case MSR_FS_BASE:
847 data = vmcs_readl(GUEST_FS_BASE);
848 break;
849 case MSR_GS_BASE:
850 data = vmcs_readl(GUEST_GS_BASE);
851 break;
852 case MSR_EFER:
853 return kvm_get_msr_common(vcpu, msr_index, pdata);
854 #endif
855 case MSR_IA32_TIME_STAMP_COUNTER:
856 data = guest_read_tsc();
857 break;
858 case MSR_IA32_SYSENTER_CS:
859 data = vmcs_read32(GUEST_SYSENTER_CS);
860 break;
861 case MSR_IA32_SYSENTER_EIP:
862 data = vmcs_readl(GUEST_SYSENTER_EIP);
863 break;
864 case MSR_IA32_SYSENTER_ESP:
865 data = vmcs_readl(GUEST_SYSENTER_ESP);
866 break;
867 default:
868 msr = find_msr_entry(to_vmx(vcpu), msr_index);
869 if (msr) {
870 data = msr->data;
871 break;
872 }
873 return kvm_get_msr_common(vcpu, msr_index, pdata);
874 }
875
876 *pdata = data;
877 return 0;
878 }
879
880 /*
881 * Writes msr value into into the appropriate "register".
882 * Returns 0 on success, non-0 otherwise.
883 * Assumes vcpu_load() was already called.
884 */
885 static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
886 {
887 struct vcpu_vmx *vmx = to_vmx(vcpu);
888 struct kvm_msr_entry *msr;
889 int ret = 0;
890
891 switch (msr_index) {
892 #ifdef CONFIG_X86_64
893 case MSR_EFER:
894 vmx_load_host_state(vmx);
895 ret = kvm_set_msr_common(vcpu, msr_index, data);
896 break;
897 case MSR_FS_BASE:
898 vmcs_writel(GUEST_FS_BASE, data);
899 break;
900 case MSR_GS_BASE:
901 vmcs_writel(GUEST_GS_BASE, data);
902 break;
903 #endif
904 case MSR_IA32_SYSENTER_CS:
905 vmcs_write32(GUEST_SYSENTER_CS, data);
906 break;
907 case MSR_IA32_SYSENTER_EIP:
908 vmcs_writel(GUEST_SYSENTER_EIP, data);
909 break;
910 case MSR_IA32_SYSENTER_ESP:
911 vmcs_writel(GUEST_SYSENTER_ESP, data);
912 break;
913 case MSR_IA32_TIME_STAMP_COUNTER:
914 guest_write_tsc(data);
915 break;
916 default:
917 vmx_load_host_state(vmx);
918 msr = find_msr_entry(vmx, msr_index);
919 if (msr) {
920 msr->data = data;
921 break;
922 }
923 ret = kvm_set_msr_common(vcpu, msr_index, data);
924 }
925
926 return ret;
927 }
928
929 /*
930 * Sync the rsp and rip registers into the vcpu structure. This allows
931 * registers to be accessed by indexing vcpu->arch.regs.
932 */
933 static void vcpu_load_rsp_rip(struct kvm_vcpu *vcpu)
934 {
935 vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
936 vcpu->arch.rip = vmcs_readl(GUEST_RIP);
937 }
938
939 /*
940 * Syncs rsp and rip back into the vmcs. Should be called after possible
941 * modification.
942 */
943 static void vcpu_put_rsp_rip(struct kvm_vcpu *vcpu)
944 {
945 vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
946 vmcs_writel(GUEST_RIP, vcpu->arch.rip);
947 }
948
949 static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_debug_guest *dbg)
950 {
951 unsigned long dr7 = 0x400;
952 int old_singlestep;
953
954 old_singlestep = vcpu->guest_debug.singlestep;
955
956 vcpu->guest_debug.enabled = dbg->enabled;
957 if (vcpu->guest_debug.enabled) {
958 int i;
959
960 dr7 |= 0x200; /* exact */
961 for (i = 0; i < 4; ++i) {
962 if (!dbg->breakpoints[i].enabled)
963 continue;
964 vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
965 dr7 |= 2 << (i*2); /* global enable */
966 dr7 |= 0 << (i*4+16); /* execution breakpoint */
967 }
968
969 vcpu->guest_debug.singlestep = dbg->singlestep;
970 } else
971 vcpu->guest_debug.singlestep = 0;
972
973 if (old_singlestep && !vcpu->guest_debug.singlestep) {
974 unsigned long flags;
975
976 flags = vmcs_readl(GUEST_RFLAGS);
977 flags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
978 vmcs_writel(GUEST_RFLAGS, flags);
979 }
980
981 update_exception_bitmap(vcpu);
982 vmcs_writel(GUEST_DR7, dr7);
983
984 return 0;
985 }
986
987 static int vmx_get_irq(struct kvm_vcpu *vcpu)
988 {
989 struct vcpu_vmx *vmx = to_vmx(vcpu);
990 u32 idtv_info_field;
991
992 idtv_info_field = vmx->idt_vectoring_info;
993 if (idtv_info_field & INTR_INFO_VALID_MASK) {
994 if (is_external_interrupt(idtv_info_field))
995 return idtv_info_field & VECTORING_INFO_VECTOR_MASK;
996 else
997 printk(KERN_DEBUG "pending exception: not handled yet\n");
998 }
999 return -1;
1000 }
1001
1002 static __init int cpu_has_kvm_support(void)
1003 {
1004 unsigned long ecx = cpuid_ecx(1);
1005 return test_bit(5, &ecx); /* CPUID.1:ECX.VMX[bit 5] -> VT */
1006 }
1007
1008 static __init int vmx_disabled_by_bios(void)
1009 {
1010 u64 msr;
1011
1012 rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
1013 return (msr & (MSR_IA32_FEATURE_CONTROL_LOCKED |
1014 MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED))
1015 == MSR_IA32_FEATURE_CONTROL_LOCKED;
1016 /* locked but not enabled */
1017 }
1018
1019 static void hardware_enable(void *garbage)
1020 {
1021 int cpu = raw_smp_processor_id();
1022 u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
1023 u64 old;
1024
1025 rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
1026 if ((old & (MSR_IA32_FEATURE_CONTROL_LOCKED |
1027 MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED))
1028 != (MSR_IA32_FEATURE_CONTROL_LOCKED |
1029 MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED))
1030 /* enable and lock */
1031 wrmsrl(MSR_IA32_FEATURE_CONTROL, old |
1032 MSR_IA32_FEATURE_CONTROL_LOCKED |
1033 MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED);
1034 write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
1035 asm volatile (ASM_VMX_VMXON_RAX
1036 : : "a"(&phys_addr), "m"(phys_addr)
1037 : "memory", "cc");
1038 }
1039
1040 static void hardware_disable(void *garbage)
1041 {
1042 asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
1043 write_cr4(read_cr4() & ~X86_CR4_VMXE);
1044 }
1045
1046 static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
1047 u32 msr, u32 *result)
1048 {
1049 u32 vmx_msr_low, vmx_msr_high;
1050 u32 ctl = ctl_min | ctl_opt;
1051
1052 rdmsr(msr, vmx_msr_low, vmx_msr_high);
1053
1054 ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */
1055 ctl |= vmx_msr_low; /* bit == 1 in low word ==> must be one */
1056
1057 /* Ensure minimum (required) set of control bits are supported. */
1058 if (ctl_min & ~ctl)
1059 return -EIO;
1060
1061 *result = ctl;
1062 return 0;
1063 }
1064
1065 static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
1066 {
1067 u32 vmx_msr_low, vmx_msr_high;
1068 u32 min, opt, min2, opt2;
1069 u32 _pin_based_exec_control = 0;
1070 u32 _cpu_based_exec_control = 0;
1071 u32 _cpu_based_2nd_exec_control = 0;
1072 u32 _vmexit_control = 0;
1073 u32 _vmentry_control = 0;
1074
1075 min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
1076 opt = 0;
1077 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
1078 &_pin_based_exec_control) < 0)
1079 return -EIO;
1080
1081 min = CPU_BASED_HLT_EXITING |
1082 #ifdef CONFIG_X86_64
1083 CPU_BASED_CR8_LOAD_EXITING |
1084 CPU_BASED_CR8_STORE_EXITING |
1085 #endif
1086 CPU_BASED_CR3_LOAD_EXITING |
1087 CPU_BASED_CR3_STORE_EXITING |
1088 CPU_BASED_USE_IO_BITMAPS |
1089 CPU_BASED_MOV_DR_EXITING |
1090 CPU_BASED_USE_TSC_OFFSETING;
1091 opt = CPU_BASED_TPR_SHADOW |
1092 CPU_BASED_USE_MSR_BITMAPS |
1093 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
1094 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
1095 &_cpu_based_exec_control) < 0)
1096 return -EIO;
1097 #ifdef CONFIG_X86_64
1098 if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
1099 _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
1100 ~CPU_BASED_CR8_STORE_EXITING;
1101 #endif
1102 if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
1103 min2 = 0;
1104 opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
1105 SECONDARY_EXEC_WBINVD_EXITING |
1106 SECONDARY_EXEC_ENABLE_VPID |
1107 SECONDARY_EXEC_ENABLE_EPT;
1108 if (adjust_vmx_controls(min2, opt2,
1109 MSR_IA32_VMX_PROCBASED_CTLS2,
1110 &_cpu_based_2nd_exec_control) < 0)
1111 return -EIO;
1112 }
1113 #ifndef CONFIG_X86_64
1114 if (!(_cpu_based_2nd_exec_control &
1115 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
1116 _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW;
1117 #endif
1118 if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
1119 /* CR3 accesses don't need to cause VM Exits when EPT enabled */
1120 min &= ~(CPU_BASED_CR3_LOAD_EXITING |
1121 CPU_BASED_CR3_STORE_EXITING);
1122 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
1123 &_cpu_based_exec_control) < 0)
1124 return -EIO;
1125 rdmsr(MSR_IA32_VMX_EPT_VPID_CAP,
1126 vmx_capability.ept, vmx_capability.vpid);
1127 }
1128
1129 min = 0;
1130 #ifdef CONFIG_X86_64
1131 min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
1132 #endif
1133 opt = 0;
1134 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
1135 &_vmexit_control) < 0)
1136 return -EIO;
1137
1138 min = opt = 0;
1139 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
1140 &_vmentry_control) < 0)
1141 return -EIO;
1142
1143 rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
1144
1145 /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
1146 if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
1147 return -EIO;
1148
1149 #ifdef CONFIG_X86_64
1150 /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
1151 if (vmx_msr_high & (1u<<16))
1152 return -EIO;
1153 #endif
1154
1155 /* Require Write-Back (WB) memory type for VMCS accesses. */
1156 if (((vmx_msr_high >> 18) & 15) != 6)
1157 return -EIO;
1158
1159 vmcs_conf->size = vmx_msr_high & 0x1fff;
1160 vmcs_conf->order = get_order(vmcs_config.size);
1161 vmcs_conf->revision_id = vmx_msr_low;
1162
1163 vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
1164 vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
1165 vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
1166 vmcs_conf->vmexit_ctrl = _vmexit_control;
1167 vmcs_conf->vmentry_ctrl = _vmentry_control;
1168
1169 return 0;
1170 }
1171
1172 static struct vmcs *alloc_vmcs_cpu(int cpu)
1173 {
1174 int node = cpu_to_node(cpu);
1175 struct page *pages;
1176 struct vmcs *vmcs;
1177
1178 pages = alloc_pages_node(node, GFP_KERNEL, vmcs_config.order);
1179 if (!pages)
1180 return NULL;
1181 vmcs = page_address(pages);
1182 memset(vmcs, 0, vmcs_config.size);
1183 vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
1184 return vmcs;
1185 }
1186
1187 static struct vmcs *alloc_vmcs(void)
1188 {
1189 return alloc_vmcs_cpu(raw_smp_processor_id());
1190 }
1191
1192 static void free_vmcs(struct vmcs *vmcs)
1193 {
1194 free_pages((unsigned long)vmcs, vmcs_config.order);
1195 }
1196
1197 static void free_kvm_area(void)
1198 {
1199 int cpu;
1200
1201 for_each_online_cpu(cpu)
1202 free_vmcs(per_cpu(vmxarea, cpu));
1203 }
1204
1205 static __init int alloc_kvm_area(void)
1206 {
1207 int cpu;
1208
1209 for_each_online_cpu(cpu) {
1210 struct vmcs *vmcs;
1211
1212 vmcs = alloc_vmcs_cpu(cpu);
1213 if (!vmcs) {
1214 free_kvm_area();
1215 return -ENOMEM;
1216 }
1217
1218 per_cpu(vmxarea, cpu) = vmcs;
1219 }
1220 return 0;
1221 }
1222
1223 static __init int hardware_setup(void)
1224 {
1225 if (setup_vmcs_config(&vmcs_config) < 0)
1226 return -EIO;
1227
1228 if (boot_cpu_has(X86_FEATURE_NX))
1229 kvm_enable_efer_bits(EFER_NX);
1230
1231 return alloc_kvm_area();
1232 }
1233
1234 static __exit void hardware_unsetup(void)
1235 {
1236 free_kvm_area();
1237 }
1238
1239 static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
1240 {
1241 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1242
1243 if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
1244 vmcs_write16(sf->selector, save->selector);
1245 vmcs_writel(sf->base, save->base);
1246 vmcs_write32(sf->limit, save->limit);
1247 vmcs_write32(sf->ar_bytes, save->ar);
1248 } else {
1249 u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
1250 << AR_DPL_SHIFT;
1251 vmcs_write32(sf->ar_bytes, 0x93 | dpl);
1252 }
1253 }
1254
1255 static void enter_pmode(struct kvm_vcpu *vcpu)
1256 {
1257 unsigned long flags;
1258
1259 vcpu->arch.rmode.active = 0;
1260
1261 vmcs_writel(GUEST_TR_BASE, vcpu->arch.rmode.tr.base);
1262 vmcs_write32(GUEST_TR_LIMIT, vcpu->arch.rmode.tr.limit);
1263 vmcs_write32(GUEST_TR_AR_BYTES, vcpu->arch.rmode.tr.ar);
1264
1265 flags = vmcs_readl(GUEST_RFLAGS);
1266 flags &= ~(X86_EFLAGS_IOPL | X86_EFLAGS_VM);
1267 flags |= (vcpu->arch.rmode.save_iopl << IOPL_SHIFT);
1268 vmcs_writel(GUEST_RFLAGS, flags);
1269
1270 vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
1271 (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
1272
1273 update_exception_bitmap(vcpu);
1274
1275 fix_pmode_dataseg(VCPU_SREG_ES, &vcpu->arch.rmode.es);
1276 fix_pmode_dataseg(VCPU_SREG_DS, &vcpu->arch.rmode.ds);
1277 fix_pmode_dataseg(VCPU_SREG_GS, &vcpu->arch.rmode.gs);
1278 fix_pmode_dataseg(VCPU_SREG_FS, &vcpu->arch.rmode.fs);
1279
1280 vmcs_write16(GUEST_SS_SELECTOR, 0);
1281 vmcs_write32(GUEST_SS_AR_BYTES, 0x93);
1282
1283 vmcs_write16(GUEST_CS_SELECTOR,
1284 vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK);
1285 vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
1286 }
1287
1288 static gva_t rmode_tss_base(struct kvm *kvm)
1289 {
1290 if (!kvm->arch.tss_addr) {
1291 gfn_t base_gfn = kvm->memslots[0].base_gfn +
1292 kvm->memslots[0].npages - 3;
1293 return base_gfn << PAGE_SHIFT;
1294 }
1295 return kvm->arch.tss_addr;
1296 }
1297
1298 static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
1299 {
1300 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1301
1302 save->selector = vmcs_read16(sf->selector);
1303 save->base = vmcs_readl(sf->base);
1304 save->limit = vmcs_read32(sf->limit);
1305 save->ar = vmcs_read32(sf->ar_bytes);
1306 vmcs_write16(sf->selector, save->base >> 4);
1307 vmcs_write32(sf->base, save->base & 0xfffff);
1308 vmcs_write32(sf->limit, 0xffff);
1309 vmcs_write32(sf->ar_bytes, 0xf3);
1310 }
1311
1312 static void enter_rmode(struct kvm_vcpu *vcpu)
1313 {
1314 unsigned long flags;
1315
1316 vcpu->arch.rmode.active = 1;
1317
1318 vcpu->arch.rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
1319 vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));
1320
1321 vcpu->arch.rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
1322 vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);
1323
1324 vcpu->arch.rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
1325 vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
1326
1327 flags = vmcs_readl(GUEST_RFLAGS);
1328 vcpu->arch.rmode.save_iopl
1329 = (flags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
1330
1331 flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
1332
1333 vmcs_writel(GUEST_RFLAGS, flags);
1334 vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
1335 update_exception_bitmap(vcpu);
1336
1337 vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
1338 vmcs_write32(GUEST_SS_LIMIT, 0xffff);
1339 vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
1340
1341 vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
1342 vmcs_write32(GUEST_CS_LIMIT, 0xffff);
1343 if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
1344 vmcs_writel(GUEST_CS_BASE, 0xf0000);
1345 vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);
1346
1347 fix_rmode_seg(VCPU_SREG_ES, &vcpu->arch.rmode.es);
1348 fix_rmode_seg(VCPU_SREG_DS, &vcpu->arch.rmode.ds);
1349 fix_rmode_seg(VCPU_SREG_GS, &vcpu->arch.rmode.gs);
1350 fix_rmode_seg(VCPU_SREG_FS, &vcpu->arch.rmode.fs);
1351
1352 kvm_mmu_reset_context(vcpu);
1353 init_rmode(vcpu->kvm);
1354 }
1355
1356 #ifdef CONFIG_X86_64
1357
1358 static void enter_lmode(struct kvm_vcpu *vcpu)
1359 {
1360 u32 guest_tr_ar;
1361
1362 guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
1363 if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
1364 printk(KERN_DEBUG "%s: tss fixup for long mode. \n",
1365 __func__);
1366 vmcs_write32(GUEST_TR_AR_BYTES,
1367 (guest_tr_ar & ~AR_TYPE_MASK)
1368 | AR_TYPE_BUSY_64_TSS);
1369 }
1370
1371 vcpu->arch.shadow_efer |= EFER_LMA;
1372
1373 find_msr_entry(to_vmx(vcpu), MSR_EFER)->data |= EFER_LMA | EFER_LME;
1374 vmcs_write32(VM_ENTRY_CONTROLS,
1375 vmcs_read32(VM_ENTRY_CONTROLS)
1376 | VM_ENTRY_IA32E_MODE);
1377 }
1378
1379 static void exit_lmode(struct kvm_vcpu *vcpu)
1380 {
1381 vcpu->arch.shadow_efer &= ~EFER_LMA;
1382
1383 vmcs_write32(VM_ENTRY_CONTROLS,
1384 vmcs_read32(VM_ENTRY_CONTROLS)
1385 & ~VM_ENTRY_IA32E_MODE);
1386 }
1387
1388 #endif
1389
1390 static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
1391 {
1392 vpid_sync_vcpu_all(to_vmx(vcpu));
1393 }
1394
1395 static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
1396 {
1397 vcpu->arch.cr4 &= KVM_GUEST_CR4_MASK;
1398 vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK;
1399 }
1400
1401 static void ept_load_pdptrs(struct kvm_vcpu *vcpu)
1402 {
1403 if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
1404 if (!load_pdptrs(vcpu, vcpu->arch.cr3)) {
1405 printk(KERN_ERR "EPT: Fail to load pdptrs!\n");
1406 return;
1407 }
1408 vmcs_write64(GUEST_PDPTR0, vcpu->arch.pdptrs[0]);
1409 vmcs_write64(GUEST_PDPTR1, vcpu->arch.pdptrs[1]);
1410 vmcs_write64(GUEST_PDPTR2, vcpu->arch.pdptrs[2]);
1411 vmcs_write64(GUEST_PDPTR3, vcpu->arch.pdptrs[3]);
1412 }
1413 }
1414
1415 static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
1416
1417 static void ept_update_paging_mode_cr0(unsigned long *hw_cr0,
1418 unsigned long cr0,
1419 struct kvm_vcpu *vcpu)
1420 {
1421 if (!(cr0 & X86_CR0_PG)) {
1422 /* From paging/starting to nonpaging */
1423 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
1424 vmcs_config.cpu_based_exec_ctrl |
1425 (CPU_BASED_CR3_LOAD_EXITING |
1426 CPU_BASED_CR3_STORE_EXITING));
1427 vcpu->arch.cr0 = cr0;
1428 vmx_set_cr4(vcpu, vcpu->arch.cr4);
1429 *hw_cr0 |= X86_CR0_PE | X86_CR0_PG;
1430 *hw_cr0 &= ~X86_CR0_WP;
1431 } else if (!is_paging(vcpu)) {
1432 /* From nonpaging to paging */
1433 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
1434 vmcs_config.cpu_based_exec_ctrl &
1435 ~(CPU_BASED_CR3_LOAD_EXITING |
1436 CPU_BASED_CR3_STORE_EXITING));
1437 vcpu->arch.cr0 = cr0;
1438 vmx_set_cr4(vcpu, vcpu->arch.cr4);
1439 if (!(vcpu->arch.cr0 & X86_CR0_WP))
1440 *hw_cr0 &= ~X86_CR0_WP;
1441 }
1442 }
1443
1444 static void ept_update_paging_mode_cr4(unsigned long *hw_cr4,
1445 struct kvm_vcpu *vcpu)
1446 {
1447 if (!is_paging(vcpu)) {
1448 *hw_cr4 &= ~X86_CR4_PAE;
1449 *hw_cr4 |= X86_CR4_PSE;
1450 } else if (!(vcpu->arch.cr4 & X86_CR4_PAE))
1451 *hw_cr4 &= ~X86_CR4_PAE;
1452 }
1453
1454 static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
1455 {
1456 unsigned long hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) |
1457 KVM_VM_CR0_ALWAYS_ON;
1458
1459 vmx_fpu_deactivate(vcpu);
1460
1461 if (vcpu->arch.rmode.active && (cr0 & X86_CR0_PE))
1462 enter_pmode(vcpu);
1463
1464 if (!vcpu->arch.rmode.active && !(cr0 & X86_CR0_PE))
1465 enter_rmode(vcpu);
1466
1467 #ifdef CONFIG_X86_64
1468 if (vcpu->arch.shadow_efer & EFER_LME) {
1469 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
1470 enter_lmode(vcpu);
1471 if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
1472 exit_lmode(vcpu);
1473 }
1474 #endif
1475
1476 if (vm_need_ept())
1477 ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu);
1478
1479 vmcs_writel(CR0_READ_SHADOW, cr0);
1480 vmcs_writel(GUEST_CR0, hw_cr0);
1481 vcpu->arch.cr0 = cr0;
1482
1483 if (!(cr0 & X86_CR0_TS) || !(cr0 & X86_CR0_PE))
1484 vmx_fpu_activate(vcpu);
1485 }
1486
1487 static u64 construct_eptp(unsigned long root_hpa)
1488 {
1489 u64 eptp;
1490
1491 /* TODO write the value reading from MSR */
1492 eptp = VMX_EPT_DEFAULT_MT |
1493 VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
1494 eptp |= (root_hpa & PAGE_MASK);
1495
1496 return eptp;
1497 }
1498
1499 static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
1500 {
1501 unsigned long guest_cr3;
1502 u64 eptp;
1503
1504 guest_cr3 = cr3;
1505 if (vm_need_ept()) {
1506 eptp = construct_eptp(cr3);
1507 vmcs_write64(EPT_POINTER, eptp);
1508 ept_sync_context(eptp);
1509 ept_load_pdptrs(vcpu);
1510 guest_cr3 = is_paging(vcpu) ? vcpu->arch.cr3 :
1511 VMX_EPT_IDENTITY_PAGETABLE_ADDR;
1512 }
1513
1514 vmx_flush_tlb(vcpu);
1515 vmcs_writel(GUEST_CR3, guest_cr3);
1516 if (vcpu->arch.cr0 & X86_CR0_PE)
1517 vmx_fpu_deactivate(vcpu);
1518 }
1519
1520 static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
1521 {
1522 unsigned long hw_cr4 = cr4 | (vcpu->arch.rmode.active ?
1523 KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON);
1524
1525 vcpu->arch.cr4 = cr4;
1526 if (vm_need_ept())
1527 ept_update_paging_mode_cr4(&hw_cr4, vcpu);
1528
1529 vmcs_writel(CR4_READ_SHADOW, cr4);
1530 vmcs_writel(GUEST_CR4, hw_cr4);
1531 }
1532
1533 static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
1534 {
1535 struct vcpu_vmx *vmx = to_vmx(vcpu);
1536 struct kvm_msr_entry *msr = find_msr_entry(vmx, MSR_EFER);
1537
1538 vcpu->arch.shadow_efer = efer;
1539 if (!msr)
1540 return;
1541 if (efer & EFER_LMA) {
1542 vmcs_write32(VM_ENTRY_CONTROLS,
1543 vmcs_read32(VM_ENTRY_CONTROLS) |
1544 VM_ENTRY_IA32E_MODE);
1545 msr->data = efer;
1546
1547 } else {
1548 vmcs_write32(VM_ENTRY_CONTROLS,
1549 vmcs_read32(VM_ENTRY_CONTROLS) &
1550 ~VM_ENTRY_IA32E_MODE);
1551
1552 msr->data = efer & ~EFER_LME;
1553 }
1554 setup_msrs(vmx);
1555 }
1556
1557 static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
1558 {
1559 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1560
1561 return vmcs_readl(sf->base);
1562 }
1563
1564 static void vmx_get_segment(struct kvm_vcpu *vcpu,
1565 struct kvm_segment *var, int seg)
1566 {
1567 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1568 u32 ar;
1569
1570 var->base = vmcs_readl(sf->base);
1571 var->limit = vmcs_read32(sf->limit);
1572 var->selector = vmcs_read16(sf->selector);
1573 ar = vmcs_read32(sf->ar_bytes);
1574 if (ar & AR_UNUSABLE_MASK)
1575 ar = 0;
1576 var->type = ar & 15;
1577 var->s = (ar >> 4) & 1;
1578 var->dpl = (ar >> 5) & 3;
1579 var->present = (ar >> 7) & 1;
1580 var->avl = (ar >> 12) & 1;
1581 var->l = (ar >> 13) & 1;
1582 var->db = (ar >> 14) & 1;
1583 var->g = (ar >> 15) & 1;
1584 var->unusable = (ar >> 16) & 1;
1585 }
1586
1587 static int vmx_get_cpl(struct kvm_vcpu *vcpu)
1588 {
1589 struct kvm_segment kvm_seg;
1590
1591 if (!(vcpu->arch.cr0 & X86_CR0_PE)) /* if real mode */
1592 return 0;
1593
1594 if (vmx_get_rflags(vcpu) & X86_EFLAGS_VM) /* if virtual 8086 */
1595 return 3;
1596
1597 vmx_get_segment(vcpu, &kvm_seg, VCPU_SREG_CS);
1598 return kvm_seg.selector & 3;
1599 }
1600
1601 static u32 vmx_segment_access_rights(struct kvm_segment *var)
1602 {
1603 u32 ar;
1604
1605 if (var->unusable)
1606 ar = 1 << 16;
1607 else {
1608 ar = var->type & 15;
1609 ar |= (var->s & 1) << 4;
1610 ar |= (var->dpl & 3) << 5;
1611 ar |= (var->present & 1) << 7;
1612 ar |= (var->avl & 1) << 12;
1613 ar |= (var->l & 1) << 13;
1614 ar |= (var->db & 1) << 14;
1615 ar |= (var->g & 1) << 15;
1616 }
1617 if (ar == 0) /* a 0 value means unusable */
1618 ar = AR_UNUSABLE_MASK;
1619
1620 return ar;
1621 }
1622
1623 static void vmx_set_segment(struct kvm_vcpu *vcpu,
1624 struct kvm_segment *var, int seg)
1625 {
1626 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1627 u32 ar;
1628
1629 if (vcpu->arch.rmode.active && seg == VCPU_SREG_TR) {
1630 vcpu->arch.rmode.tr.selector = var->selector;
1631 vcpu->arch.rmode.tr.base = var->base;
1632 vcpu->arch.rmode.tr.limit = var->limit;
1633 vcpu->arch.rmode.tr.ar = vmx_segment_access_rights(var);
1634 return;
1635 }
1636 vmcs_writel(sf->base, var->base);
1637 vmcs_write32(sf->limit, var->limit);
1638 vmcs_write16(sf->selector, var->selector);
1639 if (vcpu->arch.rmode.active && var->s) {
1640 /*
1641 * Hack real-mode segments into vm86 compatibility.
1642 */
1643 if (var->base == 0xffff0000 && var->selector == 0xf000)
1644 vmcs_writel(sf->base, 0xf0000);
1645 ar = 0xf3;
1646 } else
1647 ar = vmx_segment_access_rights(var);
1648 vmcs_write32(sf->ar_bytes, ar);
1649 }
1650
1651 static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
1652 {
1653 u32 ar = vmcs_read32(GUEST_CS_AR_BYTES);
1654
1655 *db = (ar >> 14) & 1;
1656 *l = (ar >> 13) & 1;
1657 }
1658
1659 static void vmx_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1660 {
1661 dt->limit = vmcs_read32(GUEST_IDTR_LIMIT);
1662 dt->base = vmcs_readl(GUEST_IDTR_BASE);
1663 }
1664
1665 static void vmx_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1666 {
1667 vmcs_write32(GUEST_IDTR_LIMIT, dt->limit);
1668 vmcs_writel(GUEST_IDTR_BASE, dt->base);
1669 }
1670
1671 static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1672 {
1673 dt->limit = vmcs_read32(GUEST_GDTR_LIMIT);
1674 dt->base = vmcs_readl(GUEST_GDTR_BASE);
1675 }
1676
1677 static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1678 {
1679 vmcs_write32(GUEST_GDTR_LIMIT, dt->limit);
1680 vmcs_writel(GUEST_GDTR_BASE, dt->base);
1681 }
1682
1683 static int init_rmode_tss(struct kvm *kvm)
1684 {
1685 gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
1686 u16 data = 0;
1687 int ret = 0;
1688 int r;
1689
1690 r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
1691 if (r < 0)
1692 goto out;
1693 data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
1694 r = kvm_write_guest_page(kvm, fn++, &data, 0x66, sizeof(u16));
1695 if (r < 0)
1696 goto out;
1697 r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE);
1698 if (r < 0)
1699 goto out;
1700 r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
1701 if (r < 0)
1702 goto out;
1703 data = ~0;
1704 r = kvm_write_guest_page(kvm, fn, &data,
1705 RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1,
1706 sizeof(u8));
1707 if (r < 0)
1708 goto out;
1709
1710 ret = 1;
1711 out:
1712 return ret;
1713 }
1714
1715 static int init_rmode_identity_map(struct kvm *kvm)
1716 {
1717 int i, r, ret;
1718 pfn_t identity_map_pfn;
1719 u32 tmp;
1720
1721 if (!vm_need_ept())
1722 return 1;
1723 if (unlikely(!kvm->arch.ept_identity_pagetable)) {
1724 printk(KERN_ERR "EPT: identity-mapping pagetable "
1725 "haven't been allocated!\n");
1726 return 0;
1727 }
1728 if (likely(kvm->arch.ept_identity_pagetable_done))
1729 return 1;
1730 ret = 0;
1731 identity_map_pfn = VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT;
1732 r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE);
1733 if (r < 0)
1734 goto out;
1735 /* Set up identity-mapping pagetable for EPT in real mode */
1736 for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
1737 tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
1738 _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
1739 r = kvm_write_guest_page(kvm, identity_map_pfn,
1740 &tmp, i * sizeof(tmp), sizeof(tmp));
1741 if (r < 0)
1742 goto out;
1743 }
1744 kvm->arch.ept_identity_pagetable_done = true;
1745 ret = 1;
1746 out:
1747 return ret;
1748 }
1749
1750 static void seg_setup(int seg)
1751 {
1752 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1753
1754 vmcs_write16(sf->selector, 0);
1755 vmcs_writel(sf->base, 0);
1756 vmcs_write32(sf->limit, 0xffff);
1757 vmcs_write32(sf->ar_bytes, 0x93);
1758 }
1759
1760 static int alloc_apic_access_page(struct kvm *kvm)
1761 {
1762 struct kvm_userspace_memory_region kvm_userspace_mem;
1763 int r = 0;
1764
1765 down_write(&kvm->slots_lock);
1766 if (kvm->arch.apic_access_page)
1767 goto out;
1768 kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
1769 kvm_userspace_mem.flags = 0;
1770 kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL;
1771 kvm_userspace_mem.memory_size = PAGE_SIZE;
1772 r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
1773 if (r)
1774 goto out;
1775
1776 down_read(&current->mm->mmap_sem);
1777 kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
1778 up_read(&current->mm->mmap_sem);
1779 out:
1780 up_write(&kvm->slots_lock);
1781 return r;
1782 }
1783
1784 static int alloc_identity_pagetable(struct kvm *kvm)
1785 {
1786 struct kvm_userspace_memory_region kvm_userspace_mem;
1787 int r = 0;
1788
1789 down_write(&kvm->slots_lock);
1790 if (kvm->arch.ept_identity_pagetable)
1791 goto out;
1792 kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
1793 kvm_userspace_mem.flags = 0;
1794 kvm_userspace_mem.guest_phys_addr = VMX_EPT_IDENTITY_PAGETABLE_ADDR;
1795 kvm_userspace_mem.memory_size = PAGE_SIZE;
1796 r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
1797 if (r)
1798 goto out;
1799
1800 down_read(&current->mm->mmap_sem);
1801 kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
1802 VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT);
1803 up_read(&current->mm->mmap_sem);
1804 out:
1805 up_write(&kvm->slots_lock);
1806 return r;
1807 }
1808
1809 static void allocate_vpid(struct vcpu_vmx *vmx)
1810 {
1811 int vpid;
1812
1813 vmx->vpid = 0;
1814 if (!enable_vpid || !cpu_has_vmx_vpid())
1815 return;
1816 spin_lock(&vmx_vpid_lock);
1817 vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS);
1818 if (vpid < VMX_NR_VPIDS) {
1819 vmx->vpid = vpid;
1820 __set_bit(vpid, vmx_vpid_bitmap);
1821 }
1822 spin_unlock(&vmx_vpid_lock);
1823 }
1824
1825 static void vmx_disable_intercept_for_msr(struct page *msr_bitmap, u32 msr)
1826 {
1827 void *va;
1828
1829 if (!cpu_has_vmx_msr_bitmap())
1830 return;
1831
1832 /*
1833 * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals
1834 * have the write-low and read-high bitmap offsets the wrong way round.
1835 * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff.
1836 */
1837 va = kmap(msr_bitmap);
1838 if (msr <= 0x1fff) {
1839 __clear_bit(msr, va + 0x000); /* read-low */
1840 __clear_bit(msr, va + 0x800); /* write-low */
1841 } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
1842 msr &= 0x1fff;
1843 __clear_bit(msr, va + 0x400); /* read-high */
1844 __clear_bit(msr, va + 0xc00); /* write-high */
1845 }
1846 kunmap(msr_bitmap);
1847 }
1848
1849 /*
1850 * Sets up the vmcs for emulated real mode.
1851 */
1852 static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
1853 {
1854 u32 host_sysenter_cs;
1855 u32 junk;
1856 unsigned long a;
1857 struct descriptor_table dt;
1858 int i;
1859 unsigned long kvm_vmx_return;
1860 u32 exec_control;
1861
1862 /* I/O */
1863 vmcs_write64(IO_BITMAP_A, page_to_phys(vmx_io_bitmap_a));
1864 vmcs_write64(IO_BITMAP_B, page_to_phys(vmx_io_bitmap_b));
1865
1866 if (cpu_has_vmx_msr_bitmap())
1867 vmcs_write64(MSR_BITMAP, page_to_phys(vmx_msr_bitmap));
1868
1869 vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
1870
1871 /* Control */
1872 vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
1873 vmcs_config.pin_based_exec_ctrl);
1874
1875 exec_control = vmcs_config.cpu_based_exec_ctrl;
1876 if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) {
1877 exec_control &= ~CPU_BASED_TPR_SHADOW;
1878 #ifdef CONFIG_X86_64
1879 exec_control |= CPU_BASED_CR8_STORE_EXITING |
1880 CPU_BASED_CR8_LOAD_EXITING;
1881 #endif
1882 }
1883 if (!vm_need_ept())
1884 exec_control |= CPU_BASED_CR3_STORE_EXITING |
1885 CPU_BASED_CR3_LOAD_EXITING;
1886 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
1887
1888 if (cpu_has_secondary_exec_ctrls()) {
1889 exec_control = vmcs_config.cpu_based_2nd_exec_ctrl;
1890 if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
1891 exec_control &=
1892 ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
1893 if (vmx->vpid == 0)
1894 exec_control &= ~SECONDARY_EXEC_ENABLE_VPID;
1895 if (!vm_need_ept())
1896 exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
1897 vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
1898 }
1899
1900 vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, !!bypass_guest_pf);
1901 vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, !!bypass_guest_pf);
1902 vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */
1903
1904 vmcs_writel(HOST_CR0, read_cr0()); /* 22.2.3 */
1905 vmcs_writel(HOST_CR4, read_cr4()); /* 22.2.3, 22.2.5 */
1906 vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */
1907
1908 vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */
1909 vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
1910 vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS); /* 22.2.4 */
1911 vmcs_write16(HOST_FS_SELECTOR, read_fs()); /* 22.2.4 */
1912 vmcs_write16(HOST_GS_SELECTOR, read_gs()); /* 22.2.4 */
1913 vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
1914 #ifdef CONFIG_X86_64
1915 rdmsrl(MSR_FS_BASE, a);
1916 vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
1917 rdmsrl(MSR_GS_BASE, a);
1918 vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
1919 #else
1920 vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
1921 vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
1922 #endif
1923
1924 vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */
1925
1926 get_idt(&dt);
1927 vmcs_writel(HOST_IDTR_BASE, dt.base); /* 22.2.4 */
1928
1929 asm("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return));
1930 vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */
1931 vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
1932 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
1933 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
1934
1935 rdmsr(MSR_IA32_SYSENTER_CS, host_sysenter_cs, junk);
1936 vmcs_write32(HOST_IA32_SYSENTER_CS, host_sysenter_cs);
1937 rdmsrl(MSR_IA32_SYSENTER_ESP, a);
1938 vmcs_writel(HOST_IA32_SYSENTER_ESP, a); /* 22.2.3 */
1939 rdmsrl(MSR_IA32_SYSENTER_EIP, a);
1940 vmcs_writel(HOST_IA32_SYSENTER_EIP, a); /* 22.2.3 */
1941
1942 for (i = 0; i < NR_VMX_MSR; ++i) {
1943 u32 index = vmx_msr_index[i];
1944 u32 data_low, data_high;
1945 u64 data;
1946 int j = vmx->nmsrs;
1947
1948 if (rdmsr_safe(index, &data_low, &data_high) < 0)
1949 continue;
1950 if (wrmsr_safe(index, data_low, data_high) < 0)
1951 continue;
1952 data = data_low | ((u64)data_high << 32);
1953 vmx->host_msrs[j].index = index;
1954 vmx->host_msrs[j].reserved = 0;
1955 vmx->host_msrs[j].data = data;
1956 vmx->guest_msrs[j] = vmx->host_msrs[j];
1957 ++vmx->nmsrs;
1958 }
1959
1960 vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
1961
1962 /* 22.2.1, 20.8.1 */
1963 vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);
1964
1965 vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
1966 vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK);
1967
1968
1969 return 0;
1970 }
1971
1972 static int init_rmode(struct kvm *kvm)
1973 {
1974 if (!init_rmode_tss(kvm))
1975 return 0;
1976 if (!init_rmode_identity_map(kvm))
1977 return 0;
1978 return 1;
1979 }
1980
1981 static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
1982 {
1983 struct vcpu_vmx *vmx = to_vmx(vcpu);
1984 u64 msr;
1985 int ret;
1986
1987 down_read(&vcpu->kvm->slots_lock);
1988 if (!init_rmode(vmx->vcpu.kvm)) {
1989 ret = -ENOMEM;
1990 goto out;
1991 }
1992
1993 vmx->vcpu.arch.rmode.active = 0;
1994
1995 vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
1996 kvm_set_cr8(&vmx->vcpu, 0);
1997 msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
1998 if (vmx->vcpu.vcpu_id == 0)
1999 msr |= MSR_IA32_APICBASE_BSP;
2000 kvm_set_apic_base(&vmx->vcpu, msr);
2001
2002 fx_init(&vmx->vcpu);
2003
2004 /*
2005 * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
2006 * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4. Sigh.
2007 */
2008 if (vmx->vcpu.vcpu_id == 0) {
2009 vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
2010 vmcs_writel(GUEST_CS_BASE, 0x000f0000);
2011 } else {
2012 vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8);
2013 vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12);
2014 }
2015 vmcs_write32(GUEST_CS_LIMIT, 0xffff);
2016 vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
2017
2018 seg_setup(VCPU_SREG_DS);
2019 seg_setup(VCPU_SREG_ES);
2020 seg_setup(VCPU_SREG_FS);
2021 seg_setup(VCPU_SREG_GS);
2022 seg_setup(VCPU_SREG_SS);
2023
2024 vmcs_write16(GUEST_TR_SELECTOR, 0);
2025 vmcs_writel(GUEST_TR_BASE, 0);
2026 vmcs_write32(GUEST_TR_LIMIT, 0xffff);
2027 vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
2028
2029 vmcs_write16(GUEST_LDTR_SELECTOR, 0);
2030 vmcs_writel(GUEST_LDTR_BASE, 0);
2031 vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
2032 vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);
2033
2034 vmcs_write32(GUEST_SYSENTER_CS, 0);
2035 vmcs_writel(GUEST_SYSENTER_ESP, 0);
2036 vmcs_writel(GUEST_SYSENTER_EIP, 0);
2037
2038 vmcs_writel(GUEST_RFLAGS, 0x02);
2039 if (vmx->vcpu.vcpu_id == 0)
2040 vmcs_writel(GUEST_RIP, 0xfff0);
2041 else
2042 vmcs_writel(GUEST_RIP, 0);
2043 vmcs_writel(GUEST_RSP, 0);
2044
2045 /* todo: dr0 = dr1 = dr2 = dr3 = 0; dr6 = 0xffff0ff0 */
2046 vmcs_writel(GUEST_DR7, 0x400);
2047
2048 vmcs_writel(GUEST_GDTR_BASE, 0);
2049 vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);
2050
2051 vmcs_writel(GUEST_IDTR_BASE, 0);
2052 vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);
2053
2054 vmcs_write32(GUEST_ACTIVITY_STATE, 0);
2055 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
2056 vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);
2057
2058 guest_write_tsc(0);
2059
2060 /* Special registers */
2061 vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
2062
2063 setup_msrs(vmx);
2064
2065 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */
2066
2067 if (cpu_has_vmx_tpr_shadow()) {
2068 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0);
2069 if (vm_need_tpr_shadow(vmx->vcpu.kvm))
2070 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR,
2071 page_to_phys(vmx->vcpu.arch.apic->regs_page));
2072 vmcs_write32(TPR_THRESHOLD, 0);
2073 }
2074
2075 if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
2076 vmcs_write64(APIC_ACCESS_ADDR,
2077 page_to_phys(vmx->vcpu.kvm->arch.apic_access_page));
2078
2079 if (vmx->vpid != 0)
2080 vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
2081
2082 vmx->vcpu.arch.cr0 = 0x60000010;
2083 vmx_set_cr0(&vmx->vcpu, vmx->vcpu.arch.cr0); /* enter rmode */
2084 vmx_set_cr4(&vmx->vcpu, 0);
2085 vmx_set_efer(&vmx->vcpu, 0);
2086 vmx_fpu_activate(&vmx->vcpu);
2087 update_exception_bitmap(&vmx->vcpu);
2088
2089 vpid_sync_vcpu_all(vmx);
2090
2091 ret = 0;
2092
2093 out:
2094 up_read(&vcpu->kvm->slots_lock);
2095 return ret;
2096 }
2097
2098 static void vmx_inject_irq(struct kvm_vcpu *vcpu, int irq)
2099 {
2100 struct vcpu_vmx *vmx = to_vmx(vcpu);
2101
2102 KVMTRACE_1D(INJ_VIRQ, vcpu, (u32)irq, handler);
2103
2104 if (vcpu->arch.rmode.active) {
2105 vmx->rmode.irq.pending = true;
2106 vmx->rmode.irq.vector = irq;
2107 vmx->rmode.irq.rip = vmcs_readl(GUEST_RIP);
2108 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2109 irq | INTR_TYPE_SOFT_INTR | INTR_INFO_VALID_MASK);
2110 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
2111 vmcs_writel(GUEST_RIP, vmx->rmode.irq.rip - 1);
2112 return;
2113 }
2114 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2115 irq | INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
2116 }
2117
2118 static void kvm_do_inject_irq(struct kvm_vcpu *vcpu)
2119 {
2120 int word_index = __ffs(vcpu->arch.irq_summary);
2121 int bit_index = __ffs(vcpu->arch.irq_pending[word_index]);
2122 int irq = word_index * BITS_PER_LONG + bit_index;
2123
2124 clear_bit(bit_index, &vcpu->arch.irq_pending[word_index]);
2125 if (!vcpu->arch.irq_pending[word_index])
2126 clear_bit(word_index, &vcpu->arch.irq_summary);
2127 vmx_inject_irq(vcpu, irq);
2128 }
2129
2130
2131 static void do_interrupt_requests(struct kvm_vcpu *vcpu,
2132 struct kvm_run *kvm_run)
2133 {
2134 u32 cpu_based_vm_exec_control;
2135
2136 vcpu->arch.interrupt_window_open =
2137 ((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
2138 (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0);
2139
2140 if (vcpu->arch.interrupt_window_open &&
2141 vcpu->arch.irq_summary &&
2142 !(vmcs_read32(VM_ENTRY_INTR_INFO_FIELD) & INTR_INFO_VALID_MASK))
2143 /*
2144 * If interrupts enabled, and not blocked by sti or mov ss. Good.
2145 */
2146 kvm_do_inject_irq(vcpu);
2147
2148 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
2149 if (!vcpu->arch.interrupt_window_open &&
2150 (vcpu->arch.irq_summary || kvm_run->request_interrupt_window))
2151 /*
2152 * Interrupts blocked. Wait for unblock.
2153 */
2154 cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
2155 else
2156 cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
2157 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
2158 }
2159
2160 static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
2161 {
2162 int ret;
2163 struct kvm_userspace_memory_region tss_mem = {
2164 .slot = 8,
2165 .guest_phys_addr = addr,
2166 .memory_size = PAGE_SIZE * 3,
2167 .flags = 0,
2168 };
2169
2170 ret = kvm_set_memory_region(kvm, &tss_mem, 0);
2171 if (ret)
2172 return ret;
2173 kvm->arch.tss_addr = addr;
2174 return 0;
2175 }
2176
2177 static void kvm_guest_debug_pre(struct kvm_vcpu *vcpu)
2178 {
2179 struct kvm_guest_debug *dbg = &vcpu->guest_debug;
2180
2181 set_debugreg(dbg->bp[0], 0);
2182 set_debugreg(dbg->bp[1], 1);
2183 set_debugreg(dbg->bp[2], 2);
2184 set_debugreg(dbg->bp[3], 3);
2185
2186 if (dbg->singlestep) {
2187 unsigned long flags;
2188
2189 flags = vmcs_readl(GUEST_RFLAGS);
2190 flags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
2191 vmcs_writel(GUEST_RFLAGS, flags);
2192 }
2193 }
2194
2195 static int handle_rmode_exception(struct kvm_vcpu *vcpu,
2196 int vec, u32 err_code)
2197 {
2198 if (!vcpu->arch.rmode.active)
2199 return 0;
2200
2201 /*
2202 * Instruction with address size override prefix opcode 0x67
2203 * Cause the #SS fault with 0 error code in VM86 mode.
2204 */
2205 if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
2206 if (emulate_instruction(vcpu, NULL, 0, 0, 0) == EMULATE_DONE)
2207 return 1;
2208 return 0;
2209 }
2210
2211 static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2212 {
2213 struct vcpu_vmx *vmx = to_vmx(vcpu);
2214 u32 intr_info, error_code;
2215 unsigned long cr2, rip;
2216 u32 vect_info;
2217 enum emulation_result er;
2218
2219 vect_info = vmx->idt_vectoring_info;
2220 intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
2221
2222 if ((vect_info & VECTORING_INFO_VALID_MASK) &&
2223 !is_page_fault(intr_info))
2224 printk(KERN_ERR "%s: unexpected, vectoring info 0x%x "
2225 "intr info 0x%x\n", __func__, vect_info, intr_info);
2226
2227 if (!irqchip_in_kernel(vcpu->kvm) && is_external_interrupt(vect_info)) {
2228 int irq = vect_info & VECTORING_INFO_VECTOR_MASK;
2229 set_bit(irq, vcpu->arch.irq_pending);
2230 set_bit(irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
2231 }
2232
2233 if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) /* nmi */
2234 return 1; /* already handled by vmx_vcpu_run() */
2235
2236 if (is_no_device(intr_info)) {
2237 vmx_fpu_activate(vcpu);
2238 return 1;
2239 }
2240
2241 if (is_invalid_opcode(intr_info)) {
2242 er = emulate_instruction(vcpu, kvm_run, 0, 0, EMULTYPE_TRAP_UD);
2243 if (er != EMULATE_DONE)
2244 kvm_queue_exception(vcpu, UD_VECTOR);
2245 return 1;
2246 }
2247
2248 error_code = 0;
2249 rip = vmcs_readl(GUEST_RIP);
2250 if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
2251 error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
2252 if (is_page_fault(intr_info)) {
2253 /* EPT won't cause page fault directly */
2254 if (vm_need_ept())
2255 BUG();
2256 cr2 = vmcs_readl(EXIT_QUALIFICATION);
2257 KVMTRACE_3D(PAGE_FAULT, vcpu, error_code, (u32)cr2,
2258 (u32)((u64)cr2 >> 32), handler);
2259 return kvm_mmu_page_fault(vcpu, cr2, error_code);
2260 }
2261
2262 if (vcpu->arch.rmode.active &&
2263 handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
2264 error_code)) {
2265 if (vcpu->arch.halt_request) {
2266 vcpu->arch.halt_request = 0;
2267 return kvm_emulate_halt(vcpu);
2268 }
2269 return 1;
2270 }
2271
2272 if ((intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK)) ==
2273 (INTR_TYPE_EXCEPTION | 1)) {
2274 kvm_run->exit_reason = KVM_EXIT_DEBUG;
2275 return 0;
2276 }
2277 kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
2278 kvm_run->ex.exception = intr_info & INTR_INFO_VECTOR_MASK;
2279 kvm_run->ex.error_code = error_code;
2280 return 0;
2281 }
2282
2283 static int handle_external_interrupt(struct kvm_vcpu *vcpu,
2284 struct kvm_run *kvm_run)
2285 {
2286 ++vcpu->stat.irq_exits;
2287 KVMTRACE_1D(INTR, vcpu, vmcs_read32(VM_EXIT_INTR_INFO), handler);
2288 return 1;
2289 }
2290
2291 static int handle_triple_fault(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2292 {
2293 kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
2294 return 0;
2295 }
2296
2297 static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2298 {
2299 unsigned long exit_qualification;
2300 int size, down, in, string, rep;
2301 unsigned port;
2302
2303 ++vcpu->stat.io_exits;
2304 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2305 string = (exit_qualification & 16) != 0;
2306
2307 if (string) {
2308 if (emulate_instruction(vcpu,
2309 kvm_run, 0, 0, 0) == EMULATE_DO_MMIO)
2310 return 0;
2311 return 1;
2312 }
2313
2314 size = (exit_qualification & 7) + 1;
2315 in = (exit_qualification & 8) != 0;
2316 down = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_DF) != 0;
2317 rep = (exit_qualification & 32) != 0;
2318 port = exit_qualification >> 16;
2319
2320 return kvm_emulate_pio(vcpu, kvm_run, in, size, port);
2321 }
2322
2323 static void
2324 vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
2325 {
2326 /*
2327 * Patch in the VMCALL instruction:
2328 */
2329 hypercall[0] = 0x0f;
2330 hypercall[1] = 0x01;
2331 hypercall[2] = 0xc1;
2332 }
2333
2334 static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2335 {
2336 unsigned long exit_qualification;
2337 int cr;
2338 int reg;
2339
2340 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2341 cr = exit_qualification & 15;
2342 reg = (exit_qualification >> 8) & 15;
2343 switch ((exit_qualification >> 4) & 3) {
2344 case 0: /* mov to cr */
2345 KVMTRACE_3D(CR_WRITE, vcpu, (u32)cr, (u32)vcpu->arch.regs[reg],
2346 (u32)((u64)vcpu->arch.regs[reg] >> 32), handler);
2347 switch (cr) {
2348 case 0:
2349 vcpu_load_rsp_rip(vcpu);
2350 kvm_set_cr0(vcpu, vcpu->arch.regs[reg]);
2351 skip_emulated_instruction(vcpu);
2352 return 1;
2353 case 3:
2354 vcpu_load_rsp_rip(vcpu);
2355 kvm_set_cr3(vcpu, vcpu->arch.regs[reg]);
2356 skip_emulated_instruction(vcpu);
2357 return 1;
2358 case 4:
2359 vcpu_load_rsp_rip(vcpu);
2360 kvm_set_cr4(vcpu, vcpu->arch.regs[reg]);
2361 skip_emulated_instruction(vcpu);
2362 return 1;
2363 case 8:
2364 vcpu_load_rsp_rip(vcpu);
2365 kvm_set_cr8(vcpu, vcpu->arch.regs[reg]);
2366 skip_emulated_instruction(vcpu);
2367 if (irqchip_in_kernel(vcpu->kvm))
2368 return 1;
2369 kvm_run->exit_reason = KVM_EXIT_SET_TPR;
2370 return 0;
2371 };
2372 break;
2373 case 2: /* clts */
2374 vcpu_load_rsp_rip(vcpu);
2375 vmx_fpu_deactivate(vcpu);
2376 vcpu->arch.cr0 &= ~X86_CR0_TS;
2377 vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
2378 vmx_fpu_activate(vcpu);
2379 KVMTRACE_0D(CLTS, vcpu, handler);
2380 skip_emulated_instruction(vcpu);
2381 return 1;
2382 case 1: /*mov from cr*/
2383 switch (cr) {
2384 case 3:
2385 vcpu_load_rsp_rip(vcpu);
2386 vcpu->arch.regs[reg] = vcpu->arch.cr3;
2387 vcpu_put_rsp_rip(vcpu);
2388 KVMTRACE_3D(CR_READ, vcpu, (u32)cr,
2389 (u32)vcpu->arch.regs[reg],
2390 (u32)((u64)vcpu->arch.regs[reg] >> 32),
2391 handler);
2392 skip_emulated_instruction(vcpu);
2393 return 1;
2394 case 8:
2395 vcpu_load_rsp_rip(vcpu);
2396 vcpu->arch.regs[reg] = kvm_get_cr8(vcpu);
2397 vcpu_put_rsp_rip(vcpu);
2398 KVMTRACE_2D(CR_READ, vcpu, (u32)cr,
2399 (u32)vcpu->arch.regs[reg], handler);
2400 skip_emulated_instruction(vcpu);
2401 return 1;
2402 }
2403 break;
2404 case 3: /* lmsw */
2405 kvm_lmsw(vcpu, (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f);
2406
2407 skip_emulated_instruction(vcpu);
2408 return 1;
2409 default:
2410 break;
2411 }
2412 kvm_run->exit_reason = 0;
2413 pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
2414 (int)(exit_qualification >> 4) & 3, cr);
2415 return 0;
2416 }
2417
2418 static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2419 {
2420 unsigned long exit_qualification;
2421 unsigned long val;
2422 int dr, reg;
2423
2424 /*
2425 * FIXME: this code assumes the host is debugging the guest.
2426 * need to deal with guest debugging itself too.
2427 */
2428 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2429 dr = exit_qualification & 7;
2430 reg = (exit_qualification >> 8) & 15;
2431 vcpu_load_rsp_rip(vcpu);
2432 if (exit_qualification & 16) {
2433 /* mov from dr */
2434 switch (dr) {
2435 case 6:
2436 val = 0xffff0ff0;
2437 break;
2438 case 7:
2439 val = 0x400;
2440 break;
2441 default:
2442 val = 0;
2443 }
2444 vcpu->arch.regs[reg] = val;
2445 KVMTRACE_2D(DR_READ, vcpu, (u32)dr, (u32)val, handler);
2446 } else {
2447 /* mov to dr */
2448 }
2449 vcpu_put_rsp_rip(vcpu);
2450 skip_emulated_instruction(vcpu);
2451 return 1;
2452 }
2453
2454 static int handle_cpuid(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2455 {
2456 kvm_emulate_cpuid(vcpu);
2457 return 1;
2458 }
2459
2460 static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2461 {
2462 u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
2463 u64 data;
2464
2465 if (vmx_get_msr(vcpu, ecx, &data)) {
2466 kvm_inject_gp(vcpu, 0);
2467 return 1;
2468 }
2469
2470 KVMTRACE_3D(MSR_READ, vcpu, ecx, (u32)data, (u32)(data >> 32),
2471 handler);
2472
2473 /* FIXME: handling of bits 32:63 of rax, rdx */
2474 vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
2475 vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
2476 skip_emulated_instruction(vcpu);
2477 return 1;
2478 }
2479
2480 static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2481 {
2482 u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
2483 u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
2484 | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
2485
2486 KVMTRACE_3D(MSR_WRITE, vcpu, ecx, (u32)data, (u32)(data >> 32),
2487 handler);
2488
2489 if (vmx_set_msr(vcpu, ecx, data) != 0) {
2490 kvm_inject_gp(vcpu, 0);
2491 return 1;
2492 }
2493
2494 skip_emulated_instruction(vcpu);
2495 return 1;
2496 }
2497
2498 static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu,
2499 struct kvm_run *kvm_run)
2500 {
2501 return 1;
2502 }
2503
2504 static int handle_interrupt_window(struct kvm_vcpu *vcpu,
2505 struct kvm_run *kvm_run)
2506 {
2507 u32 cpu_based_vm_exec_control;
2508
2509 /* clear pending irq */
2510 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
2511 cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
2512 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
2513
2514 KVMTRACE_0D(PEND_INTR, vcpu, handler);
2515
2516 /*
2517 * If the user space waits to inject interrupts, exit as soon as
2518 * possible
2519 */
2520 if (kvm_run->request_interrupt_window &&
2521 !vcpu->arch.irq_summary) {
2522 kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
2523 ++vcpu->stat.irq_window_exits;
2524 return 0;
2525 }
2526 return 1;
2527 }
2528
2529 static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2530 {
2531 skip_emulated_instruction(vcpu);
2532 return kvm_emulate_halt(vcpu);
2533 }
2534
2535 static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2536 {
2537 skip_emulated_instruction(vcpu);
2538 kvm_emulate_hypercall(vcpu);
2539 return 1;
2540 }
2541
2542 static int handle_wbinvd(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2543 {
2544 skip_emulated_instruction(vcpu);
2545 /* TODO: Add support for VT-d/pass-through device */
2546 return 1;
2547 }
2548
2549 static int handle_apic_access(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2550 {
2551 u64 exit_qualification;
2552 enum emulation_result er;
2553 unsigned long offset;
2554
2555 exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
2556 offset = exit_qualification & 0xffful;
2557
2558 er = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
2559
2560 if (er != EMULATE_DONE) {
2561 printk(KERN_ERR
2562 "Fail to handle apic access vmexit! Offset is 0x%lx\n",
2563 offset);
2564 return -ENOTSUPP;
2565 }
2566 return 1;
2567 }
2568
2569 static int handle_task_switch(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2570 {
2571 unsigned long exit_qualification;
2572 u16 tss_selector;
2573 int reason;
2574
2575 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2576
2577 reason = (u32)exit_qualification >> 30;
2578 tss_selector = exit_qualification;
2579
2580 return kvm_task_switch(vcpu, tss_selector, reason);
2581 }
2582
2583 static int handle_ept_violation(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2584 {
2585 u64 exit_qualification;
2586 enum emulation_result er;
2587 gpa_t gpa;
2588 unsigned long hva;
2589 int gla_validity;
2590 int r;
2591
2592 exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
2593
2594 if (exit_qualification & (1 << 6)) {
2595 printk(KERN_ERR "EPT: GPA exceeds GAW!\n");
2596 return -ENOTSUPP;
2597 }
2598
2599 gla_validity = (exit_qualification >> 7) & 0x3;
2600 if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) {
2601 printk(KERN_ERR "EPT: Handling EPT violation failed!\n");
2602 printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n",
2603 (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS),
2604 (long unsigned int)vmcs_read64(GUEST_LINEAR_ADDRESS));
2605 printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
2606 (long unsigned int)exit_qualification);
2607 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
2608 kvm_run->hw.hardware_exit_reason = 0;
2609 return -ENOTSUPP;
2610 }
2611
2612 gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
2613 hva = gfn_to_hva(vcpu->kvm, gpa >> PAGE_SHIFT);
2614 if (!kvm_is_error_hva(hva)) {
2615 r = kvm_mmu_page_fault(vcpu, gpa & PAGE_MASK, 0);
2616 if (r < 0) {
2617 printk(KERN_ERR "EPT: Not enough memory!\n");
2618 return -ENOMEM;
2619 }
2620 return 1;
2621 } else {
2622 /* must be MMIO */
2623 er = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
2624
2625 if (er == EMULATE_FAIL) {
2626 printk(KERN_ERR
2627 "EPT: Fail to handle EPT violation vmexit!er is %d\n",
2628 er);
2629 printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n",
2630 (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS),
2631 (long unsigned int)vmcs_read64(GUEST_LINEAR_ADDRESS));
2632 printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
2633 (long unsigned int)exit_qualification);
2634 return -ENOTSUPP;
2635 } else if (er == EMULATE_DO_MMIO)
2636 return 0;
2637 }
2638 return 1;
2639 }
2640
2641 /*
2642 * The exit handlers return 1 if the exit was handled fully and guest execution
2643 * may resume. Otherwise they set the kvm_run parameter to indicate what needs
2644 * to be done to userspace and return 0.
2645 */
2646 static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu,
2647 struct kvm_run *kvm_run) = {
2648 [EXIT_REASON_EXCEPTION_NMI] = handle_exception,
2649 [EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt,
2650 [EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault,
2651 [EXIT_REASON_IO_INSTRUCTION] = handle_io,
2652 [EXIT_REASON_CR_ACCESS] = handle_cr,
2653 [EXIT_REASON_DR_ACCESS] = handle_dr,
2654 [EXIT_REASON_CPUID] = handle_cpuid,
2655 [EXIT_REASON_MSR_READ] = handle_rdmsr,
2656 [EXIT_REASON_MSR_WRITE] = handle_wrmsr,
2657 [EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window,
2658 [EXIT_REASON_HLT] = handle_halt,
2659 [EXIT_REASON_VMCALL] = handle_vmcall,
2660 [EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold,
2661 [EXIT_REASON_APIC_ACCESS] = handle_apic_access,
2662 [EXIT_REASON_WBINVD] = handle_wbinvd,
2663 [EXIT_REASON_TASK_SWITCH] = handle_task_switch,
2664 [EXIT_REASON_EPT_VIOLATION] = handle_ept_violation,
2665 };
2666
2667 static const int kvm_vmx_max_exit_handlers =
2668 ARRAY_SIZE(kvm_vmx_exit_handlers);
2669
2670 /*
2671 * The guest has exited. See if we can fix it or if we need userspace
2672 * assistance.
2673 */
2674 static int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
2675 {
2676 u32 exit_reason = vmcs_read32(VM_EXIT_REASON);
2677 struct vcpu_vmx *vmx = to_vmx(vcpu);
2678 u32 vectoring_info = vmx->idt_vectoring_info;
2679
2680 KVMTRACE_3D(VMEXIT, vcpu, exit_reason, (u32)vmcs_readl(GUEST_RIP),
2681 (u32)((u64)vmcs_readl(GUEST_RIP) >> 32), entryexit);
2682
2683 /* Access CR3 don't cause VMExit in paging mode, so we need
2684 * to sync with guest real CR3. */
2685 if (vm_need_ept() && is_paging(vcpu)) {
2686 vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
2687 ept_load_pdptrs(vcpu);
2688 }
2689
2690 if (unlikely(vmx->fail)) {
2691 kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
2692 kvm_run->fail_entry.hardware_entry_failure_reason
2693 = vmcs_read32(VM_INSTRUCTION_ERROR);
2694 return 0;
2695 }
2696
2697 if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
2698 (exit_reason != EXIT_REASON_EXCEPTION_NMI &&
2699 exit_reason != EXIT_REASON_EPT_VIOLATION))
2700 printk(KERN_WARNING "%s: unexpected, valid vectoring info and "
2701 "exit reason is 0x%x\n", __func__, exit_reason);
2702 if (exit_reason < kvm_vmx_max_exit_handlers
2703 && kvm_vmx_exit_handlers[exit_reason])
2704 return kvm_vmx_exit_handlers[exit_reason](vcpu, kvm_run);
2705 else {
2706 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
2707 kvm_run->hw.hardware_exit_reason = exit_reason;
2708 }
2709 return 0;
2710 }
2711
2712 static void update_tpr_threshold(struct kvm_vcpu *vcpu)
2713 {
2714 int max_irr, tpr;
2715
2716 if (!vm_need_tpr_shadow(vcpu->kvm))
2717 return;
2718
2719 if (!kvm_lapic_enabled(vcpu) ||
2720 ((max_irr = kvm_lapic_find_highest_irr(vcpu)) == -1)) {
2721 vmcs_write32(TPR_THRESHOLD, 0);
2722 return;
2723 }
2724
2725 tpr = (kvm_lapic_get_cr8(vcpu) & 0x0f) << 4;
2726 vmcs_write32(TPR_THRESHOLD, (max_irr > tpr) ? tpr >> 4 : max_irr >> 4);
2727 }
2728
2729 static void enable_irq_window(struct kvm_vcpu *vcpu)
2730 {
2731 u32 cpu_based_vm_exec_control;
2732
2733 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
2734 cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
2735 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
2736 }
2737
2738 static void vmx_intr_assist(struct kvm_vcpu *vcpu)
2739 {
2740 struct vcpu_vmx *vmx = to_vmx(vcpu);
2741 u32 idtv_info_field, intr_info_field;
2742 int has_ext_irq, interrupt_window_open;
2743 int vector;
2744
2745 update_tpr_threshold(vcpu);
2746
2747 has_ext_irq = kvm_cpu_has_interrupt(vcpu);
2748 intr_info_field = vmcs_read32(VM_ENTRY_INTR_INFO_FIELD);
2749 idtv_info_field = vmx->idt_vectoring_info;
2750 if (intr_info_field & INTR_INFO_VALID_MASK) {
2751 if (idtv_info_field & INTR_INFO_VALID_MASK) {
2752 /* TODO: fault when IDT_Vectoring */
2753 if (printk_ratelimit())
2754 printk(KERN_ERR "Fault when IDT_Vectoring\n");
2755 }
2756 if (has_ext_irq)
2757 enable_irq_window(vcpu);
2758 return;
2759 }
2760 if (unlikely(idtv_info_field & INTR_INFO_VALID_MASK)) {
2761 if ((idtv_info_field & VECTORING_INFO_TYPE_MASK)
2762 == INTR_TYPE_EXT_INTR
2763 && vcpu->arch.rmode.active) {
2764 u8 vect = idtv_info_field & VECTORING_INFO_VECTOR_MASK;
2765
2766 vmx_inject_irq(vcpu, vect);
2767 if (unlikely(has_ext_irq))
2768 enable_irq_window(vcpu);
2769 return;
2770 }
2771
2772 KVMTRACE_1D(REDELIVER_EVT, vcpu, idtv_info_field, handler);
2773
2774 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, idtv_info_field);
2775 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
2776 vmcs_read32(VM_EXIT_INSTRUCTION_LEN));
2777
2778 if (unlikely(idtv_info_field & INTR_INFO_DELIVER_CODE_MASK))
2779 vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE,
2780 vmcs_read32(IDT_VECTORING_ERROR_CODE));
2781 if (unlikely(has_ext_irq))
2782 enable_irq_window(vcpu);
2783 return;
2784 }
2785 if (!has_ext_irq)
2786 return;
2787 interrupt_window_open =
2788 ((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
2789 (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0);
2790 if (interrupt_window_open) {
2791 vector = kvm_cpu_get_interrupt(vcpu);
2792 vmx_inject_irq(vcpu, vector);
2793 kvm_timer_intr_post(vcpu, vector);
2794 } else
2795 enable_irq_window(vcpu);
2796 }
2797
2798 /*
2799 * Failure to inject an interrupt should give us the information
2800 * in IDT_VECTORING_INFO_FIELD. However, if the failure occurs
2801 * when fetching the interrupt redirection bitmap in the real-mode
2802 * tss, this doesn't happen. So we do it ourselves.
2803 */
2804 static void fixup_rmode_irq(struct vcpu_vmx *vmx)
2805 {
2806 vmx->rmode.irq.pending = 0;
2807 if (vmcs_readl(GUEST_RIP) + 1 != vmx->rmode.irq.rip)
2808 return;
2809 vmcs_writel(GUEST_RIP, vmx->rmode.irq.rip);
2810 if (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) {
2811 vmx->idt_vectoring_info &= ~VECTORING_INFO_TYPE_MASK;
2812 vmx->idt_vectoring_info |= INTR_TYPE_EXT_INTR;
2813 return;
2814 }
2815 vmx->idt_vectoring_info =
2816 VECTORING_INFO_VALID_MASK
2817 | INTR_TYPE_EXT_INTR
2818 | vmx->rmode.irq.vector;
2819 }
2820
2821 static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2822 {
2823 struct vcpu_vmx *vmx = to_vmx(vcpu);
2824 u32 intr_info;
2825
2826 /*
2827 * Loading guest fpu may have cleared host cr0.ts
2828 */
2829 vmcs_writel(HOST_CR0, read_cr0());
2830
2831 asm(
2832 /* Store host registers */
2833 #ifdef CONFIG_X86_64
2834 "push %%rdx; push %%rbp;"
2835 "push %%rcx \n\t"
2836 #else
2837 "push %%edx; push %%ebp;"
2838 "push %%ecx \n\t"
2839 #endif
2840 __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t"
2841 /* Check if vmlaunch of vmresume is needed */
2842 "cmpl $0, %c[launched](%0) \n\t"
2843 /* Load guest registers. Don't clobber flags. */
2844 #ifdef CONFIG_X86_64
2845 "mov %c[cr2](%0), %%rax \n\t"
2846 "mov %%rax, %%cr2 \n\t"
2847 "mov %c[rax](%0), %%rax \n\t"
2848 "mov %c[rbx](%0), %%rbx \n\t"
2849 "mov %c[rdx](%0), %%rdx \n\t"
2850 "mov %c[rsi](%0), %%rsi \n\t"
2851 "mov %c[rdi](%0), %%rdi \n\t"
2852 "mov %c[rbp](%0), %%rbp \n\t"
2853 "mov %c[r8](%0), %%r8 \n\t"
2854 "mov %c[r9](%0), %%r9 \n\t"
2855 "mov %c[r10](%0), %%r10 \n\t"
2856 "mov %c[r11](%0), %%r11 \n\t"
2857 "mov %c[r12](%0), %%r12 \n\t"
2858 "mov %c[r13](%0), %%r13 \n\t"
2859 "mov %c[r14](%0), %%r14 \n\t"
2860 "mov %c[r15](%0), %%r15 \n\t"
2861 "mov %c[rcx](%0), %%rcx \n\t" /* kills %0 (rcx) */
2862 #else
2863 "mov %c[cr2](%0), %%eax \n\t"
2864 "mov %%eax, %%cr2 \n\t"
2865 "mov %c[rax](%0), %%eax \n\t"
2866 "mov %c[rbx](%0), %%ebx \n\t"
2867 "mov %c[rdx](%0), %%edx \n\t"
2868 "mov %c[rsi](%0), %%esi \n\t"
2869 "mov %c[rdi](%0), %%edi \n\t"
2870 "mov %c[rbp](%0), %%ebp \n\t"
2871 "mov %c[rcx](%0), %%ecx \n\t" /* kills %0 (ecx) */
2872 #endif
2873 /* Enter guest mode */
2874 "jne .Llaunched \n\t"
2875 __ex(ASM_VMX_VMLAUNCH) "\n\t"
2876 "jmp .Lkvm_vmx_return \n\t"
2877 ".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t"
2878 ".Lkvm_vmx_return: "
2879 /* Save guest registers, load host registers, keep flags */
2880 #ifdef CONFIG_X86_64
2881 "xchg %0, (%%rsp) \n\t"
2882 "mov %%rax, %c[rax](%0) \n\t"
2883 "mov %%rbx, %c[rbx](%0) \n\t"
2884 "pushq (%%rsp); popq %c[rcx](%0) \n\t"
2885 "mov %%rdx, %c[rdx](%0) \n\t"
2886 "mov %%rsi, %c[rsi](%0) \n\t"
2887 "mov %%rdi, %c[rdi](%0) \n\t"
2888 "mov %%rbp, %c[rbp](%0) \n\t"
2889 "mov %%r8, %c[r8](%0) \n\t"
2890 "mov %%r9, %c[r9](%0) \n\t"
2891 "mov %%r10, %c[r10](%0) \n\t"
2892 "mov %%r11, %c[r11](%0) \n\t"
2893 "mov %%r12, %c[r12](%0) \n\t"
2894 "mov %%r13, %c[r13](%0) \n\t"
2895 "mov %%r14, %c[r14](%0) \n\t"
2896 "mov %%r15, %c[r15](%0) \n\t"
2897 "mov %%cr2, %%rax \n\t"
2898 "mov %%rax, %c[cr2](%0) \n\t"
2899
2900 "pop %%rbp; pop %%rbp; pop %%rdx \n\t"
2901 #else
2902 "xchg %0, (%%esp) \n\t"
2903 "mov %%eax, %c[rax](%0) \n\t"
2904 "mov %%ebx, %c[rbx](%0) \n\t"
2905 "pushl (%%esp); popl %c[rcx](%0) \n\t"
2906 "mov %%edx, %c[rdx](%0) \n\t"
2907 "mov %%esi, %c[rsi](%0) \n\t"
2908 "mov %%edi, %c[rdi](%0) \n\t"
2909 "mov %%ebp, %c[rbp](%0) \n\t"
2910 "mov %%cr2, %%eax \n\t"
2911 "mov %%eax, %c[cr2](%0) \n\t"
2912
2913 "pop %%ebp; pop %%ebp; pop %%edx \n\t"
2914 #endif
2915 "setbe %c[fail](%0) \n\t"
2916 : : "c"(vmx), "d"((unsigned long)HOST_RSP),
2917 [launched]"i"(offsetof(struct vcpu_vmx, launched)),
2918 [fail]"i"(offsetof(struct vcpu_vmx, fail)),
2919 [rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])),
2920 [rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])),
2921 [rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])),
2922 [rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])),
2923 [rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])),
2924 [rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])),
2925 [rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])),
2926 #ifdef CONFIG_X86_64
2927 [r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])),
2928 [r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])),
2929 [r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])),
2930 [r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])),
2931 [r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])),
2932 [r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])),
2933 [r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])),
2934 [r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])),
2935 #endif
2936 [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2))
2937 : "cc", "memory"
2938 #ifdef CONFIG_X86_64
2939 , "rbx", "rdi", "rsi"
2940 , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
2941 #else
2942 , "ebx", "edi", "rsi"
2943 #endif
2944 );
2945
2946 vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
2947 if (vmx->rmode.irq.pending)
2948 fixup_rmode_irq(vmx);
2949
2950 vcpu->arch.interrupt_window_open =
2951 (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0;
2952
2953 asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
2954 vmx->launched = 1;
2955
2956 intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
2957
2958 /* We need to handle NMIs before interrupts are enabled */
2959 if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) { /* nmi */
2960 KVMTRACE_0D(NMI, vcpu, handler);
2961 asm("int $2");
2962 }
2963 }
2964
2965 static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
2966 {
2967 struct vcpu_vmx *vmx = to_vmx(vcpu);
2968
2969 if (vmx->vmcs) {
2970 on_each_cpu(__vcpu_clear, vmx, 1);
2971 free_vmcs(vmx->vmcs);
2972 vmx->vmcs = NULL;
2973 }
2974 }
2975
2976 static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
2977 {
2978 struct vcpu_vmx *vmx = to_vmx(vcpu);
2979
2980 spin_lock(&vmx_vpid_lock);
2981 if (vmx->vpid != 0)
2982 __clear_bit(vmx->vpid, vmx_vpid_bitmap);
2983 spin_unlock(&vmx_vpid_lock);
2984 vmx_free_vmcs(vcpu);
2985 kfree(vmx->host_msrs);
2986 kfree(vmx->guest_msrs);
2987 kvm_vcpu_uninit(vcpu);
2988 kmem_cache_free(kvm_vcpu_cache, vmx);
2989 }
2990
2991 static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
2992 {
2993 int err;
2994 struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
2995 int cpu;
2996
2997 if (!vmx)
2998 return ERR_PTR(-ENOMEM);
2999
3000 allocate_vpid(vmx);
3001 if (id == 0 && vm_need_ept()) {
3002 kvm_mmu_set_base_ptes(VMX_EPT_READABLE_MASK |
3003 VMX_EPT_WRITABLE_MASK |
3004 VMX_EPT_DEFAULT_MT << VMX_EPT_MT_EPTE_SHIFT);
3005 kvm_mmu_set_mask_ptes(0ull, VMX_EPT_FAKE_ACCESSED_MASK,
3006 VMX_EPT_FAKE_DIRTY_MASK, 0ull,
3007 VMX_EPT_EXECUTABLE_MASK);
3008 kvm_enable_tdp();
3009 }
3010
3011 err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
3012 if (err)
3013 goto free_vcpu;
3014
3015 vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
3016 if (!vmx->guest_msrs) {
3017 err = -ENOMEM;
3018 goto uninit_vcpu;
3019 }
3020
3021 vmx->host_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
3022 if (!vmx->host_msrs)
3023 goto free_guest_msrs;
3024
3025 vmx->vmcs = alloc_vmcs();
3026 if (!vmx->vmcs)
3027 goto free_msrs;
3028
3029 vmcs_clear(vmx->vmcs);
3030
3031 cpu = get_cpu();
3032 vmx_vcpu_load(&vmx->vcpu, cpu);
3033 err = vmx_vcpu_setup(vmx);
3034 vmx_vcpu_put(&vmx->vcpu);
3035 put_cpu();
3036 if (err)
3037 goto free_vmcs;
3038 if (vm_need_virtualize_apic_accesses(kvm))
3039 if (alloc_apic_access_page(kvm) != 0)
3040 goto free_vmcs;
3041
3042 if (vm_need_ept())
3043 if (alloc_identity_pagetable(kvm) != 0)
3044 goto free_vmcs;
3045
3046 return &vmx->vcpu;
3047
3048 free_vmcs:
3049 free_vmcs(vmx->vmcs);
3050 free_msrs:
3051 kfree(vmx->host_msrs);
3052 free_guest_msrs:
3053 kfree(vmx->guest_msrs);
3054 uninit_vcpu:
3055 kvm_vcpu_uninit(&vmx->vcpu);
3056 free_vcpu:
3057 kmem_cache_free(kvm_vcpu_cache, vmx);
3058 return ERR_PTR(err);
3059 }
3060
3061 static void __init vmx_check_processor_compat(void *rtn)
3062 {
3063 struct vmcs_config vmcs_conf;
3064
3065 *(int *)rtn = 0;
3066 if (setup_vmcs_config(&vmcs_conf) < 0)
3067 *(int *)rtn = -EIO;
3068 if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) {
3069 printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n",
3070 smp_processor_id());
3071 *(int *)rtn = -EIO;
3072 }
3073 }
3074
3075 static int get_ept_level(void)
3076 {
3077 return VMX_EPT_DEFAULT_GAW + 1;
3078 }
3079
3080 static struct kvm_x86_ops vmx_x86_ops = {
3081 .cpu_has_kvm_support = cpu_has_kvm_support,
3082 .disabled_by_bios = vmx_disabled_by_bios,
3083 .hardware_setup = hardware_setup,
3084 .hardware_unsetup = hardware_unsetup,
3085 .check_processor_compatibility = vmx_check_processor_compat,
3086 .hardware_enable = hardware_enable,
3087 .hardware_disable = hardware_disable,
3088 .cpu_has_accelerated_tpr = cpu_has_vmx_virtualize_apic_accesses,
3089
3090 .vcpu_create = vmx_create_vcpu,
3091 .vcpu_free = vmx_free_vcpu,
3092 .vcpu_reset = vmx_vcpu_reset,
3093
3094 .prepare_guest_switch = vmx_save_host_state,
3095 .vcpu_load = vmx_vcpu_load,
3096 .vcpu_put = vmx_vcpu_put,
3097 .vcpu_decache = vmx_vcpu_decache,
3098
3099 .set_guest_debug = set_guest_debug,
3100 .guest_debug_pre = kvm_guest_debug_pre,
3101 .get_msr = vmx_get_msr,
3102 .set_msr = vmx_set_msr,
3103 .get_segment_base = vmx_get_segment_base,
3104 .get_segment = vmx_get_segment,
3105 .set_segment = vmx_set_segment,
3106 .get_cpl = vmx_get_cpl,
3107 .get_cs_db_l_bits = vmx_get_cs_db_l_bits,
3108 .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
3109 .set_cr0 = vmx_set_cr0,
3110 .set_cr3 = vmx_set_cr3,
3111 .set_cr4 = vmx_set_cr4,
3112 .set_efer = vmx_set_efer,
3113 .get_idt = vmx_get_idt,
3114 .set_idt = vmx_set_idt,
3115 .get_gdt = vmx_get_gdt,
3116 .set_gdt = vmx_set_gdt,
3117 .cache_regs = vcpu_load_rsp_rip,
3118 .decache_regs = vcpu_put_rsp_rip,
3119 .get_rflags = vmx_get_rflags,
3120 .set_rflags = vmx_set_rflags,
3121
3122 .tlb_flush = vmx_flush_tlb,
3123
3124 .run = vmx_vcpu_run,
3125 .handle_exit = kvm_handle_exit,
3126 .skip_emulated_instruction = skip_emulated_instruction,
3127 .patch_hypercall = vmx_patch_hypercall,
3128 .get_irq = vmx_get_irq,
3129 .set_irq = vmx_inject_irq,
3130 .queue_exception = vmx_queue_exception,
3131 .exception_injected = vmx_exception_injected,
3132 .inject_pending_irq = vmx_intr_assist,
3133 .inject_pending_vectors = do_interrupt_requests,
3134
3135 .set_tss_addr = vmx_set_tss_addr,
3136 .get_tdp_level = get_ept_level,
3137 };
3138
3139 static int __init vmx_init(void)
3140 {
3141 void *va;
3142 int r;
3143
3144 vmx_io_bitmap_a = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
3145 if (!vmx_io_bitmap_a)
3146 return -ENOMEM;
3147
3148 vmx_io_bitmap_b = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
3149 if (!vmx_io_bitmap_b) {
3150 r = -ENOMEM;
3151 goto out;
3152 }
3153
3154 vmx_msr_bitmap = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
3155 if (!vmx_msr_bitmap) {
3156 r = -ENOMEM;
3157 goto out1;
3158 }
3159
3160 /*
3161 * Allow direct access to the PC debug port (it is often used for I/O
3162 * delays, but the vmexits simply slow things down).
3163 */
3164 va = kmap(vmx_io_bitmap_a);
3165 memset(va, 0xff, PAGE_SIZE);
3166 clear_bit(0x80, va);
3167 kunmap(vmx_io_bitmap_a);
3168
3169 va = kmap(vmx_io_bitmap_b);
3170 memset(va, 0xff, PAGE_SIZE);
3171 kunmap(vmx_io_bitmap_b);
3172
3173 va = kmap(vmx_msr_bitmap);
3174 memset(va, 0xff, PAGE_SIZE);
3175 kunmap(vmx_msr_bitmap);
3176
3177 set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */
3178
3179 r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), THIS_MODULE);
3180 if (r)
3181 goto out2;
3182
3183 vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_FS_BASE);
3184 vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_GS_BASE);
3185 vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_CS);
3186 vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_ESP);
3187 vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_EIP);
3188
3189 if (cpu_has_vmx_ept())
3190 bypass_guest_pf = 0;
3191
3192 if (bypass_guest_pf)
3193 kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull);
3194
3195 ept_sync_global();
3196
3197 return 0;
3198
3199 out2:
3200 __free_page(vmx_msr_bitmap);
3201 out1:
3202 __free_page(vmx_io_bitmap_b);
3203 out:
3204 __free_page(vmx_io_bitmap_a);
3205 return r;
3206 }
3207
3208 static void __exit vmx_exit(void)
3209 {
3210 __free_page(vmx_msr_bitmap);
3211 __free_page(vmx_io_bitmap_b);
3212 __free_page(vmx_io_bitmap_a);
3213
3214 kvm_exit();
3215 }
3216
3217 module_init(vmx_init)
3218 module_exit(vmx_exit)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree