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[cor_2_6_31.git] / arch / x86 / kvm / vmx.c
blob356a0ce85c68d92427260f8478b88a9036f41ef2
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 "mmu.h"
20
21 #include <linux/kvm_host.h>
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/mm.h>
25 #include <linux/highmem.h>
26 #include <linux/sched.h>
27 #include <linux/moduleparam.h>
28 #include "kvm_cache_regs.h"
29 #include "x86.h"
30
31 #include <asm/io.h>
32 #include <asm/desc.h>
33 #include <asm/vmx.h>
34 #include <asm/virtext.h>
35 #include <asm/mce.h>
36
37 #define __ex(x) __kvm_handle_fault_on_reboot(x)
38
39 MODULE_AUTHOR("Qumranet");
40 MODULE_LICENSE("GPL");
41
42 static int __read_mostly bypass_guest_pf = 1;
43 module_param(bypass_guest_pf, bool, S_IRUGO);
44
45 static int __read_mostly enable_vpid = 1;
46 module_param_named(vpid, enable_vpid, bool, 0444);
47
48 static int __read_mostly flexpriority_enabled = 1;
49 module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO);
50
51 static int __read_mostly enable_ept = 1;
52 module_param_named(ept, enable_ept, bool, S_IRUGO);
53
54 static int __read_mostly emulate_invalid_guest_state = 0;
55 module_param(emulate_invalid_guest_state, bool, S_IRUGO);
56
57 struct vmcs {
58 u32 revision_id;
59 u32 abort;
60 char data[0];
61 };
62
63 struct vcpu_vmx {
64 struct kvm_vcpu vcpu;
65 struct list_head local_vcpus_link;
66 unsigned long host_rsp;
67 int launched;
68 u8 fail;
69 u32 idt_vectoring_info;
70 struct kvm_msr_entry *guest_msrs;
71 struct kvm_msr_entry *host_msrs;
72 int nmsrs;
73 int save_nmsrs;
74 int msr_offset_efer;
75 #ifdef CONFIG_X86_64
76 int msr_offset_kernel_gs_base;
77 #endif
78 struct vmcs *vmcs;
79 struct {
80 int loaded;
81 u16 fs_sel, gs_sel, ldt_sel;
82 int gs_ldt_reload_needed;
83 int fs_reload_needed;
84 int guest_efer_loaded;
85 } host_state;
86 struct {
87 struct {
88 bool pending;
89 u8 vector;
90 unsigned rip;
91 } irq;
92 } rmode;
93 int vpid;
94 bool emulation_required;
95 enum emulation_result invalid_state_emulation_result;
96
97 /* Support for vnmi-less CPUs */
98 int soft_vnmi_blocked;
99 ktime_t entry_time;
100 s64 vnmi_blocked_time;
101 u32 exit_reason;
102 };
103
104 static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
105 {
106 return container_of(vcpu, struct vcpu_vmx, vcpu);
107 }
108
109 static int init_rmode(struct kvm *kvm);
110 static u64 construct_eptp(unsigned long root_hpa);
111
112 static DEFINE_PER_CPU(struct vmcs *, vmxarea);
113 static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
114 static DEFINE_PER_CPU(struct list_head, vcpus_on_cpu);
115
116 static unsigned long *vmx_io_bitmap_a;
117 static unsigned long *vmx_io_bitmap_b;
118 static unsigned long *vmx_msr_bitmap_legacy;
119 static unsigned long *vmx_msr_bitmap_longmode;
120
121 static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS);
122 static DEFINE_SPINLOCK(vmx_vpid_lock);
123
124 static struct vmcs_config {
125 int size;
126 int order;
127 u32 revision_id;
128 u32 pin_based_exec_ctrl;
129 u32 cpu_based_exec_ctrl;
130 u32 cpu_based_2nd_exec_ctrl;
131 u32 vmexit_ctrl;
132 u32 vmentry_ctrl;
133 } vmcs_config;
134
135 static struct vmx_capability {
136 u32 ept;
137 u32 vpid;
138 } vmx_capability;
139
140 #define VMX_SEGMENT_FIELD(seg) \
141 [VCPU_SREG_##seg] = { \
142 .selector = GUEST_##seg##_SELECTOR, \
143 .base = GUEST_##seg##_BASE, \
144 .limit = GUEST_##seg##_LIMIT, \
145 .ar_bytes = GUEST_##seg##_AR_BYTES, \
146 }
147
148 static struct kvm_vmx_segment_field {
149 unsigned selector;
150 unsigned base;
151 unsigned limit;
152 unsigned ar_bytes;
153 } kvm_vmx_segment_fields[] = {
154 VMX_SEGMENT_FIELD(CS),
155 VMX_SEGMENT_FIELD(DS),
156 VMX_SEGMENT_FIELD(ES),
157 VMX_SEGMENT_FIELD(FS),
158 VMX_SEGMENT_FIELD(GS),
159 VMX_SEGMENT_FIELD(SS),
160 VMX_SEGMENT_FIELD(TR),
161 VMX_SEGMENT_FIELD(LDTR),
162 };
163
164 /*
165 * Keep MSR_K6_STAR at the end, as setup_msrs() will try to optimize it
166 * away by decrementing the array size.
167 */
168 static const u32 vmx_msr_index[] = {
169 #ifdef CONFIG_X86_64
170 MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, MSR_KERNEL_GS_BASE,
171 #endif
172 MSR_EFER, MSR_K6_STAR,
173 };
174 #define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
175
176 static void load_msrs(struct kvm_msr_entry *e, int n)
177 {
178 int i;
179
180 for (i = 0; i < n; ++i)
181 wrmsrl(e[i].index, e[i].data);
182 }
183
184 static void save_msrs(struct kvm_msr_entry *e, int n)
185 {
186 int i;
187
188 for (i = 0; i < n; ++i)
189 rdmsrl(e[i].index, e[i].data);
190 }
191
192 static inline int is_page_fault(u32 intr_info)
193 {
194 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
195 INTR_INFO_VALID_MASK)) ==
196 (INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
197 }
198
199 static inline int is_no_device(u32 intr_info)
200 {
201 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
202 INTR_INFO_VALID_MASK)) ==
203 (INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
204 }
205
206 static inline int is_invalid_opcode(u32 intr_info)
207 {
208 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
209 INTR_INFO_VALID_MASK)) ==
210 (INTR_TYPE_HARD_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
211 }
212
213 static inline int is_external_interrupt(u32 intr_info)
214 {
215 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
216 == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
217 }
218
219 static inline int is_machine_check(u32 intr_info)
220 {
221 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
222 INTR_INFO_VALID_MASK)) ==
223 (INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK);
224 }
225
226 static inline int cpu_has_vmx_msr_bitmap(void)
227 {
228 return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS;
229 }
230
231 static inline int cpu_has_vmx_tpr_shadow(void)
232 {
233 return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW;
234 }
235
236 static inline int vm_need_tpr_shadow(struct kvm *kvm)
237 {
238 return (cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm));
239 }
240
241 static inline int cpu_has_secondary_exec_ctrls(void)
242 {
243 return vmcs_config.cpu_based_exec_ctrl &
244 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
245 }
246
247 static inline bool cpu_has_vmx_virtualize_apic_accesses(void)
248 {
249 return vmcs_config.cpu_based_2nd_exec_ctrl &
250 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
251 }
252
253 static inline bool cpu_has_vmx_flexpriority(void)
254 {
255 return cpu_has_vmx_tpr_shadow() &&
256 cpu_has_vmx_virtualize_apic_accesses();
257 }
258
259 static inline int cpu_has_vmx_invept_individual_addr(void)
260 {
261 return !!(vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT);
262 }
263
264 static inline int cpu_has_vmx_invept_context(void)
265 {
266 return !!(vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT);
267 }
268
269 static inline int cpu_has_vmx_invept_global(void)
270 {
271 return !!(vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT);
272 }
273
274 static inline int cpu_has_vmx_ept(void)
275 {
276 return vmcs_config.cpu_based_2nd_exec_ctrl &
277 SECONDARY_EXEC_ENABLE_EPT;
278 }
279
280 static inline int vm_need_virtualize_apic_accesses(struct kvm *kvm)
281 {
282 return flexpriority_enabled &&
283 (cpu_has_vmx_virtualize_apic_accesses()) &&
284 (irqchip_in_kernel(kvm));
285 }
286
287 static inline int cpu_has_vmx_vpid(void)
288 {
289 return vmcs_config.cpu_based_2nd_exec_ctrl &
290 SECONDARY_EXEC_ENABLE_VPID;
291 }
292
293 static inline int cpu_has_virtual_nmis(void)
294 {
295 return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS;
296 }
297
298 static inline bool report_flexpriority(void)
299 {
300 return flexpriority_enabled;
301 }
302
303 static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr)
304 {
305 int i;
306
307 for (i = 0; i < vmx->nmsrs; ++i)
308 if (vmx->guest_msrs[i].index == msr)
309 return i;
310 return -1;
311 }
312
313 static inline void __invvpid(int ext, u16 vpid, gva_t gva)
314 {
315 struct {
316 u64 vpid : 16;
317 u64 rsvd : 48;
318 u64 gva;
319 } operand = { vpid, 0, gva };
320
321 asm volatile (__ex(ASM_VMX_INVVPID)
322 /* CF==1 or ZF==1 --> rc = -1 */
323 "; ja 1f ; ud2 ; 1:"
324 : : "a"(&operand), "c"(ext) : "cc", "memory");
325 }
326
327 static inline void __invept(int ext, u64 eptp, gpa_t gpa)
328 {
329 struct {
330 u64 eptp, gpa;
331 } operand = {eptp, gpa};
332
333 asm volatile (__ex(ASM_VMX_INVEPT)
334 /* CF==1 or ZF==1 --> rc = -1 */
335 "; ja 1f ; ud2 ; 1:\n"
336 : : "a" (&operand), "c" (ext) : "cc", "memory");
337 }
338
339 static struct kvm_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr)
340 {
341 int i;
342
343 i = __find_msr_index(vmx, msr);
344 if (i >= 0)
345 return &vmx->guest_msrs[i];
346 return NULL;
347 }
348
349 static void vmcs_clear(struct vmcs *vmcs)
350 {
351 u64 phys_addr = __pa(vmcs);
352 u8 error;
353
354 asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) "; setna %0"
355 : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
356 : "cc", "memory");
357 if (error)
358 printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
359 vmcs, phys_addr);
360 }
361
362 static void __vcpu_clear(void *arg)
363 {
364 struct vcpu_vmx *vmx = arg;
365 int cpu = raw_smp_processor_id();
366
367 if (vmx->vcpu.cpu == cpu)
368 vmcs_clear(vmx->vmcs);
369 if (per_cpu(current_vmcs, cpu) == vmx->vmcs)
370 per_cpu(current_vmcs, cpu) = NULL;
371 rdtscll(vmx->vcpu.arch.host_tsc);
372 list_del(&vmx->local_vcpus_link);
373 vmx->vcpu.cpu = -1;
374 vmx->launched = 0;
375 }
376
377 static void vcpu_clear(struct vcpu_vmx *vmx)
378 {
379 if (vmx->vcpu.cpu == -1)
380 return;
381 smp_call_function_single(vmx->vcpu.cpu, __vcpu_clear, vmx, 1);
382 }
383
384 static inline void vpid_sync_vcpu_all(struct vcpu_vmx *vmx)
385 {
386 if (vmx->vpid == 0)
387 return;
388
389 __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0);
390 }
391
392 static inline void ept_sync_global(void)
393 {
394 if (cpu_has_vmx_invept_global())
395 __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
396 }
397
398 static inline void ept_sync_context(u64 eptp)
399 {
400 if (enable_ept) {
401 if (cpu_has_vmx_invept_context())
402 __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
403 else
404 ept_sync_global();
405 }
406 }
407
408 static inline void ept_sync_individual_addr(u64 eptp, gpa_t gpa)
409 {
410 if (enable_ept) {
411 if (cpu_has_vmx_invept_individual_addr())
412 __invept(VMX_EPT_EXTENT_INDIVIDUAL_ADDR,
413 eptp, gpa);
414 else
415 ept_sync_context(eptp);
416 }
417 }
418
419 static unsigned long vmcs_readl(unsigned long field)
420 {
421 unsigned long value;
422
423 asm volatile (__ex(ASM_VMX_VMREAD_RDX_RAX)
424 : "=a"(value) : "d"(field) : "cc");
425 return value;
426 }
427
428 static u16 vmcs_read16(unsigned long field)
429 {
430 return vmcs_readl(field);
431 }
432
433 static u32 vmcs_read32(unsigned long field)
434 {
435 return vmcs_readl(field);
436 }
437
438 static u64 vmcs_read64(unsigned long field)
439 {
440 #ifdef CONFIG_X86_64
441 return vmcs_readl(field);
442 #else
443 return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
444 #endif
445 }
446
447 static noinline void vmwrite_error(unsigned long field, unsigned long value)
448 {
449 printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
450 field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
451 dump_stack();
452 }
453
454 static void vmcs_writel(unsigned long field, unsigned long value)
455 {
456 u8 error;
457
458 asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) "; setna %0"
459 : "=q"(error) : "a"(value), "d"(field) : "cc");
460 if (unlikely(error))
461 vmwrite_error(field, value);
462 }
463
464 static void vmcs_write16(unsigned long field, u16 value)
465 {
466 vmcs_writel(field, value);
467 }
468
469 static void vmcs_write32(unsigned long field, u32 value)
470 {
471 vmcs_writel(field, value);
472 }
473
474 static void vmcs_write64(unsigned long field, u64 value)
475 {
476 vmcs_writel(field, value);
477 #ifndef CONFIG_X86_64
478 asm volatile ("");
479 vmcs_writel(field+1, value >> 32);
480 #endif
481 }
482
483 static void vmcs_clear_bits(unsigned long field, u32 mask)
484 {
485 vmcs_writel(field, vmcs_readl(field) & ~mask);
486 }
487
488 static void vmcs_set_bits(unsigned long field, u32 mask)
489 {
490 vmcs_writel(field, vmcs_readl(field) | mask);
491 }
492
493 static void update_exception_bitmap(struct kvm_vcpu *vcpu)
494 {
495 u32 eb;
496
497 eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR);
498 if (!vcpu->fpu_active)
499 eb |= 1u << NM_VECTOR;
500 if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
501 if (vcpu->guest_debug &
502 (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
503 eb |= 1u << DB_VECTOR;
504 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
505 eb |= 1u << BP_VECTOR;
506 }
507 if (vcpu->arch.rmode.vm86_active)
508 eb = ~0;
509 if (enable_ept)
510 eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */
511 vmcs_write32(EXCEPTION_BITMAP, eb);
512 }
513
514 static void reload_tss(void)
515 {
516 /*
517 * VT restores TR but not its size. Useless.
518 */
519 struct descriptor_table gdt;
520 struct desc_struct *descs;
521
522 kvm_get_gdt(&gdt);
523 descs = (void *)gdt.base;
524 descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
525 load_TR_desc();
526 }
527
528 static void load_transition_efer(struct vcpu_vmx *vmx)
529 {
530 int efer_offset = vmx->msr_offset_efer;
531 u64 host_efer = vmx->host_msrs[efer_offset].data;
532 u64 guest_efer = vmx->guest_msrs[efer_offset].data;
533 u64 ignore_bits;
534
535 if (efer_offset < 0)
536 return;
537 /*
538 * NX is emulated; LMA and LME handled by hardware; SCE meaninless
539 * outside long mode
540 */
541 ignore_bits = EFER_NX | EFER_SCE;
542 #ifdef CONFIG_X86_64
543 ignore_bits |= EFER_LMA | EFER_LME;
544 /* SCE is meaningful only in long mode on Intel */
545 if (guest_efer & EFER_LMA)
546 ignore_bits &= ~(u64)EFER_SCE;
547 #endif
548 if ((guest_efer & ~ignore_bits) == (host_efer & ~ignore_bits))
549 return;
550
551 vmx->host_state.guest_efer_loaded = 1;
552 guest_efer &= ~ignore_bits;
553 guest_efer |= host_efer & ignore_bits;
554 wrmsrl(MSR_EFER, guest_efer);
555 vmx->vcpu.stat.efer_reload++;
556 }
557
558 static void reload_host_efer(struct vcpu_vmx *vmx)
559 {
560 if (vmx->host_state.guest_efer_loaded) {
561 vmx->host_state.guest_efer_loaded = 0;
562 load_msrs(vmx->host_msrs + vmx->msr_offset_efer, 1);
563 }
564 }
565
566 static void vmx_save_host_state(struct kvm_vcpu *vcpu)
567 {
568 struct vcpu_vmx *vmx = to_vmx(vcpu);
569
570 if (vmx->host_state.loaded)
571 return;
572
573 vmx->host_state.loaded = 1;
574 /*
575 * Set host fs and gs selectors. Unfortunately, 22.2.3 does not
576 * allow segment selectors with cpl > 0 or ti == 1.
577 */
578 vmx->host_state.ldt_sel = kvm_read_ldt();
579 vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;
580 vmx->host_state.fs_sel = kvm_read_fs();
581 if (!(vmx->host_state.fs_sel & 7)) {
582 vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
583 vmx->host_state.fs_reload_needed = 0;
584 } else {
585 vmcs_write16(HOST_FS_SELECTOR, 0);
586 vmx->host_state.fs_reload_needed = 1;
587 }
588 vmx->host_state.gs_sel = kvm_read_gs();
589 if (!(vmx->host_state.gs_sel & 7))
590 vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel);
591 else {
592 vmcs_write16(HOST_GS_SELECTOR, 0);
593 vmx->host_state.gs_ldt_reload_needed = 1;
594 }
595
596 #ifdef CONFIG_X86_64
597 vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
598 vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
599 #else
600 vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
601 vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
602 #endif
603
604 #ifdef CONFIG_X86_64
605 if (is_long_mode(&vmx->vcpu))
606 save_msrs(vmx->host_msrs +
607 vmx->msr_offset_kernel_gs_base, 1);
608
609 #endif
610 load_msrs(vmx->guest_msrs, vmx->save_nmsrs);
611 load_transition_efer(vmx);
612 }
613
614 static void __vmx_load_host_state(struct vcpu_vmx *vmx)
615 {
616 unsigned long flags;
617
618 if (!vmx->host_state.loaded)
619 return;
620
621 ++vmx->vcpu.stat.host_state_reload;
622 vmx->host_state.loaded = 0;
623 if (vmx->host_state.fs_reload_needed)
624 kvm_load_fs(vmx->host_state.fs_sel);
625 if (vmx->host_state.gs_ldt_reload_needed) {
626 kvm_load_ldt(vmx->host_state.ldt_sel);
627 /*
628 * If we have to reload gs, we must take care to
629 * preserve our gs base.
630 */
631 local_irq_save(flags);
632 kvm_load_gs(vmx->host_state.gs_sel);
633 #ifdef CONFIG_X86_64
634 wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
635 #endif
636 local_irq_restore(flags);
637 }
638 reload_tss();
639 save_msrs(vmx->guest_msrs, vmx->save_nmsrs);
640 load_msrs(vmx->host_msrs, vmx->save_nmsrs);
641 reload_host_efer(vmx);
642 }
643
644 static void vmx_load_host_state(struct vcpu_vmx *vmx)
645 {
646 preempt_disable();
647 __vmx_load_host_state(vmx);
648 preempt_enable();
649 }
650
651 /*
652 * Switches to specified vcpu, until a matching vcpu_put(), but assumes
653 * vcpu mutex is already taken.
654 */
655 static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
656 {
657 struct vcpu_vmx *vmx = to_vmx(vcpu);
658 u64 phys_addr = __pa(vmx->vmcs);
659 u64 tsc_this, delta, new_offset;
660
661 if (vcpu->cpu != cpu) {
662 vcpu_clear(vmx);
663 kvm_migrate_timers(vcpu);
664 vpid_sync_vcpu_all(vmx);
665 local_irq_disable();
666 list_add(&vmx->local_vcpus_link,
667 &per_cpu(vcpus_on_cpu, cpu));
668 local_irq_enable();
669 }
670
671 if (per_cpu(current_vmcs, cpu) != vmx->vmcs) {
672 u8 error;
673
674 per_cpu(current_vmcs, cpu) = vmx->vmcs;
675 asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
676 : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
677 : "cc");
678 if (error)
679 printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
680 vmx->vmcs, phys_addr);
681 }
682
683 if (vcpu->cpu != cpu) {
684 struct descriptor_table dt;
685 unsigned long sysenter_esp;
686
687 vcpu->cpu = cpu;
688 /*
689 * Linux uses per-cpu TSS and GDT, so set these when switching
690 * processors.
691 */
692 vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */
693 kvm_get_gdt(&dt);
694 vmcs_writel(HOST_GDTR_BASE, dt.base); /* 22.2.4 */
695
696 rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
697 vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
698
699 /*
700 * Make sure the time stamp counter is monotonous.
701 */
702 rdtscll(tsc_this);
703 if (tsc_this < vcpu->arch.host_tsc) {
704 delta = vcpu->arch.host_tsc - tsc_this;
705 new_offset = vmcs_read64(TSC_OFFSET) + delta;
706 vmcs_write64(TSC_OFFSET, new_offset);
707 }
708 }
709 }
710
711 static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
712 {
713 __vmx_load_host_state(to_vmx(vcpu));
714 }
715
716 static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
717 {
718 if (vcpu->fpu_active)
719 return;
720 vcpu->fpu_active = 1;
721 vmcs_clear_bits(GUEST_CR0, X86_CR0_TS);
722 if (vcpu->arch.cr0 & X86_CR0_TS)
723 vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
724 update_exception_bitmap(vcpu);
725 }
726
727 static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
728 {
729 if (!vcpu->fpu_active)
730 return;
731 vcpu->fpu_active = 0;
732 vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
733 update_exception_bitmap(vcpu);
734 }
735
736 static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
737 {
738 return vmcs_readl(GUEST_RFLAGS);
739 }
740
741 static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
742 {
743 if (vcpu->arch.rmode.vm86_active)
744 rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
745 vmcs_writel(GUEST_RFLAGS, rflags);
746 }
747
748 static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
749 {
750 u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
751 int ret = 0;
752
753 if (interruptibility & GUEST_INTR_STATE_STI)
754 ret |= X86_SHADOW_INT_STI;
755 if (interruptibility & GUEST_INTR_STATE_MOV_SS)
756 ret |= X86_SHADOW_INT_MOV_SS;
757
758 return ret & mask;
759 }
760
761 static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
762 {
763 u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
764 u32 interruptibility = interruptibility_old;
765
766 interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS);
767
768 if (mask & X86_SHADOW_INT_MOV_SS)
769 interruptibility |= GUEST_INTR_STATE_MOV_SS;
770 if (mask & X86_SHADOW_INT_STI)
771 interruptibility |= GUEST_INTR_STATE_STI;
772
773 if ((interruptibility != interruptibility_old))
774 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility);
775 }
776
777 static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
778 {
779 unsigned long rip;
780
781 rip = kvm_rip_read(vcpu);
782 rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
783 kvm_rip_write(vcpu, rip);
784
785 /* skipping an emulated instruction also counts */
786 vmx_set_interrupt_shadow(vcpu, 0);
787 }
788
789 static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
790 bool has_error_code, u32 error_code)
791 {
792 struct vcpu_vmx *vmx = to_vmx(vcpu);
793 u32 intr_info = nr | INTR_INFO_VALID_MASK;
794
795 if (has_error_code) {
796 vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
797 intr_info |= INTR_INFO_DELIVER_CODE_MASK;
798 }
799
800 if (vcpu->arch.rmode.vm86_active) {
801 vmx->rmode.irq.pending = true;
802 vmx->rmode.irq.vector = nr;
803 vmx->rmode.irq.rip = kvm_rip_read(vcpu);
804 if (nr == BP_VECTOR || nr == OF_VECTOR)
805 vmx->rmode.irq.rip++;
806 intr_info |= INTR_TYPE_SOFT_INTR;
807 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
808 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
809 kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
810 return;
811 }
812
813 if (kvm_exception_is_soft(nr)) {
814 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
815 vmx->vcpu.arch.event_exit_inst_len);
816 intr_info |= INTR_TYPE_SOFT_EXCEPTION;
817 } else
818 intr_info |= INTR_TYPE_HARD_EXCEPTION;
819
820 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
821 }
822
823 /*
824 * Swap MSR entry in host/guest MSR entry array.
825 */
826 #ifdef CONFIG_X86_64
827 static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
828 {
829 struct kvm_msr_entry tmp;
830
831 tmp = vmx->guest_msrs[to];
832 vmx->guest_msrs[to] = vmx->guest_msrs[from];
833 vmx->guest_msrs[from] = tmp;
834 tmp = vmx->host_msrs[to];
835 vmx->host_msrs[to] = vmx->host_msrs[from];
836 vmx->host_msrs[from] = tmp;
837 }
838 #endif
839
840 /*
841 * Set up the vmcs to automatically save and restore system
842 * msrs. Don't touch the 64-bit msrs if the guest is in legacy
843 * mode, as fiddling with msrs is very expensive.
844 */
845 static void setup_msrs(struct vcpu_vmx *vmx)
846 {
847 int save_nmsrs;
848 unsigned long *msr_bitmap;
849
850 vmx_load_host_state(vmx);
851 save_nmsrs = 0;
852 #ifdef CONFIG_X86_64
853 if (is_long_mode(&vmx->vcpu)) {
854 int index;
855
856 index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
857 if (index >= 0)
858 move_msr_up(vmx, index, save_nmsrs++);
859 index = __find_msr_index(vmx, MSR_LSTAR);
860 if (index >= 0)
861 move_msr_up(vmx, index, save_nmsrs++);
862 index = __find_msr_index(vmx, MSR_CSTAR);
863 if (index >= 0)
864 move_msr_up(vmx, index, save_nmsrs++);
865 index = __find_msr_index(vmx, MSR_KERNEL_GS_BASE);
866 if (index >= 0)
867 move_msr_up(vmx, index, save_nmsrs++);
868 /*
869 * MSR_K6_STAR is only needed on long mode guests, and only
870 * if efer.sce is enabled.
871 */
872 index = __find_msr_index(vmx, MSR_K6_STAR);
873 if ((index >= 0) && (vmx->vcpu.arch.shadow_efer & EFER_SCE))
874 move_msr_up(vmx, index, save_nmsrs++);
875 }
876 #endif
877 vmx->save_nmsrs = save_nmsrs;
878
879 #ifdef CONFIG_X86_64
880 vmx->msr_offset_kernel_gs_base =
881 __find_msr_index(vmx, MSR_KERNEL_GS_BASE);
882 #endif
883 vmx->msr_offset_efer = __find_msr_index(vmx, MSR_EFER);
884
885 if (cpu_has_vmx_msr_bitmap()) {
886 if (is_long_mode(&vmx->vcpu))
887 msr_bitmap = vmx_msr_bitmap_longmode;
888 else
889 msr_bitmap = vmx_msr_bitmap_legacy;
890
891 vmcs_write64(MSR_BITMAP, __pa(msr_bitmap));
892 }
893 }
894
895 /*
896 * reads and returns guest's timestamp counter "register"
897 * guest_tsc = host_tsc + tsc_offset -- 21.3
898 */
899 static u64 guest_read_tsc(void)
900 {
901 u64 host_tsc, tsc_offset;
902
903 rdtscll(host_tsc);
904 tsc_offset = vmcs_read64(TSC_OFFSET);
905 return host_tsc + tsc_offset;
906 }
907
908 /*
909 * writes 'guest_tsc' into guest's timestamp counter "register"
910 * guest_tsc = host_tsc + tsc_offset ==> tsc_offset = guest_tsc - host_tsc
911 */
912 static void guest_write_tsc(u64 guest_tsc, u64 host_tsc)
913 {
914 vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc);
915 }
916
917 /*
918 * Reads an msr value (of 'msr_index') into 'pdata'.
919 * Returns 0 on success, non-0 otherwise.
920 * Assumes vcpu_load() was already called.
921 */
922 static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
923 {
924 u64 data;
925 struct kvm_msr_entry *msr;
926
927 if (!pdata) {
928 printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
929 return -EINVAL;
930 }
931
932 switch (msr_index) {
933 #ifdef CONFIG_X86_64
934 case MSR_FS_BASE:
935 data = vmcs_readl(GUEST_FS_BASE);
936 break;
937 case MSR_GS_BASE:
938 data = vmcs_readl(GUEST_GS_BASE);
939 break;
940 case MSR_EFER:
941 return kvm_get_msr_common(vcpu, msr_index, pdata);
942 #endif
943 case MSR_IA32_TIME_STAMP_COUNTER:
944 data = guest_read_tsc();
945 break;
946 case MSR_IA32_SYSENTER_CS:
947 data = vmcs_read32(GUEST_SYSENTER_CS);
948 break;
949 case MSR_IA32_SYSENTER_EIP:
950 data = vmcs_readl(GUEST_SYSENTER_EIP);
951 break;
952 case MSR_IA32_SYSENTER_ESP:
953 data = vmcs_readl(GUEST_SYSENTER_ESP);
954 break;
955 default:
956 vmx_load_host_state(to_vmx(vcpu));
957 msr = find_msr_entry(to_vmx(vcpu), msr_index);
958 if (msr) {
959 data = msr->data;
960 break;
961 }
962 return kvm_get_msr_common(vcpu, msr_index, pdata);
963 }
964
965 *pdata = data;
966 return 0;
967 }
968
969 /*
970 * Writes msr value into into the appropriate "register".
971 * Returns 0 on success, non-0 otherwise.
972 * Assumes vcpu_load() was already called.
973 */
974 static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
975 {
976 struct vcpu_vmx *vmx = to_vmx(vcpu);
977 struct kvm_msr_entry *msr;
978 u64 host_tsc;
979 int ret = 0;
980
981 switch (msr_index) {
982 case MSR_EFER:
983 vmx_load_host_state(vmx);
984 ret = kvm_set_msr_common(vcpu, msr_index, data);
985 break;
986 #ifdef CONFIG_X86_64
987 case MSR_FS_BASE:
988 vmcs_writel(GUEST_FS_BASE, data);
989 break;
990 case MSR_GS_BASE:
991 vmcs_writel(GUEST_GS_BASE, data);
992 break;
993 #endif
994 case MSR_IA32_SYSENTER_CS:
995 vmcs_write32(GUEST_SYSENTER_CS, data);
996 break;
997 case MSR_IA32_SYSENTER_EIP:
998 vmcs_writel(GUEST_SYSENTER_EIP, data);
999 break;
1000 case MSR_IA32_SYSENTER_ESP:
1001 vmcs_writel(GUEST_SYSENTER_ESP, data);
1002 break;
1003 case MSR_IA32_TIME_STAMP_COUNTER:
1004 rdtscll(host_tsc);
1005 guest_write_tsc(data, host_tsc);
1006 break;
1007 case MSR_P6_PERFCTR0:
1008 case MSR_P6_PERFCTR1:
1009 case MSR_P6_EVNTSEL0:
1010 case MSR_P6_EVNTSEL1:
1011 /*
1012 * Just discard all writes to the performance counters; this
1013 * should keep both older linux and windows 64-bit guests
1014 * happy
1015 */
1016 pr_unimpl(vcpu, "unimplemented perfctr wrmsr: 0x%x data 0x%llx\n", msr_index, data);
1017
1018 break;
1019 case MSR_IA32_CR_PAT:
1020 if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
1021 vmcs_write64(GUEST_IA32_PAT, data);
1022 vcpu->arch.pat = data;
1023 break;
1024 }
1025 /* Otherwise falls through to kvm_set_msr_common */
1026 default:
1027 vmx_load_host_state(vmx);
1028 msr = find_msr_entry(vmx, msr_index);
1029 if (msr) {
1030 msr->data = data;
1031 break;
1032 }
1033 ret = kvm_set_msr_common(vcpu, msr_index, data);
1034 }
1035
1036 return ret;
1037 }
1038
1039 static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
1040 {
1041 __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
1042 switch (reg) {
1043 case VCPU_REGS_RSP:
1044 vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
1045 break;
1046 case VCPU_REGS_RIP:
1047 vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP);
1048 break;
1049 default:
1050 break;
1051 }
1052 }
1053
1054 static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
1055 {
1056 int old_debug = vcpu->guest_debug;
1057 unsigned long flags;
1058
1059 vcpu->guest_debug = dbg->control;
1060 if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
1061 vcpu->guest_debug = 0;
1062
1063 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
1064 vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]);
1065 else
1066 vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
1067
1068 flags = vmcs_readl(GUEST_RFLAGS);
1069 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
1070 flags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
1071 else if (old_debug & KVM_GUESTDBG_SINGLESTEP)
1072 flags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1073 vmcs_writel(GUEST_RFLAGS, flags);
1074
1075 update_exception_bitmap(vcpu);
1076
1077 return 0;
1078 }
1079
1080 static __init int cpu_has_kvm_support(void)
1081 {
1082 return cpu_has_vmx();
1083 }
1084
1085 static __init int vmx_disabled_by_bios(void)
1086 {
1087 u64 msr;
1088
1089 rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
1090 return (msr & (FEATURE_CONTROL_LOCKED |
1091 FEATURE_CONTROL_VMXON_ENABLED))
1092 == FEATURE_CONTROL_LOCKED;
1093 /* locked but not enabled */
1094 }
1095
1096 static void hardware_enable(void *garbage)
1097 {
1098 int cpu = raw_smp_processor_id();
1099 u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
1100 u64 old;
1101
1102 INIT_LIST_HEAD(&per_cpu(vcpus_on_cpu, cpu));
1103 rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
1104 if ((old & (FEATURE_CONTROL_LOCKED |
1105 FEATURE_CONTROL_VMXON_ENABLED))
1106 != (FEATURE_CONTROL_LOCKED |
1107 FEATURE_CONTROL_VMXON_ENABLED))
1108 /* enable and lock */
1109 wrmsrl(MSR_IA32_FEATURE_CONTROL, old |
1110 FEATURE_CONTROL_LOCKED |
1111 FEATURE_CONTROL_VMXON_ENABLED);
1112 write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
1113 asm volatile (ASM_VMX_VMXON_RAX
1114 : : "a"(&phys_addr), "m"(phys_addr)
1115 : "memory", "cc");
1116 }
1117
1118 static void vmclear_local_vcpus(void)
1119 {
1120 int cpu = raw_smp_processor_id();
1121 struct vcpu_vmx *vmx, *n;
1122
1123 list_for_each_entry_safe(vmx, n, &per_cpu(vcpus_on_cpu, cpu),
1124 local_vcpus_link)
1125 __vcpu_clear(vmx);
1126 }
1127
1128
1129 /* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot()
1130 * tricks.
1131 */
1132 static void kvm_cpu_vmxoff(void)
1133 {
1134 asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
1135 write_cr4(read_cr4() & ~X86_CR4_VMXE);
1136 }
1137
1138 static void hardware_disable(void *garbage)
1139 {
1140 vmclear_local_vcpus();
1141 kvm_cpu_vmxoff();
1142 }
1143
1144 static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
1145 u32 msr, u32 *result)
1146 {
1147 u32 vmx_msr_low, vmx_msr_high;
1148 u32 ctl = ctl_min | ctl_opt;
1149
1150 rdmsr(msr, vmx_msr_low, vmx_msr_high);
1151
1152 ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */
1153 ctl |= vmx_msr_low; /* bit == 1 in low word ==> must be one */
1154
1155 /* Ensure minimum (required) set of control bits are supported. */
1156 if (ctl_min & ~ctl)
1157 return -EIO;
1158
1159 *result = ctl;
1160 return 0;
1161 }
1162
1163 static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
1164 {
1165 u32 vmx_msr_low, vmx_msr_high;
1166 u32 min, opt, min2, opt2;
1167 u32 _pin_based_exec_control = 0;
1168 u32 _cpu_based_exec_control = 0;
1169 u32 _cpu_based_2nd_exec_control = 0;
1170 u32 _vmexit_control = 0;
1171 u32 _vmentry_control = 0;
1172
1173 min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
1174 opt = PIN_BASED_VIRTUAL_NMIS;
1175 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
1176 &_pin_based_exec_control) < 0)
1177 return -EIO;
1178
1179 min = CPU_BASED_HLT_EXITING |
1180 #ifdef CONFIG_X86_64
1181 CPU_BASED_CR8_LOAD_EXITING |
1182 CPU_BASED_CR8_STORE_EXITING |
1183 #endif
1184 CPU_BASED_CR3_LOAD_EXITING |
1185 CPU_BASED_CR3_STORE_EXITING |
1186 CPU_BASED_USE_IO_BITMAPS |
1187 CPU_BASED_MOV_DR_EXITING |
1188 CPU_BASED_USE_TSC_OFFSETING |
1189 CPU_BASED_INVLPG_EXITING;
1190 opt = CPU_BASED_TPR_SHADOW |
1191 CPU_BASED_USE_MSR_BITMAPS |
1192 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
1193 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
1194 &_cpu_based_exec_control) < 0)
1195 return -EIO;
1196 #ifdef CONFIG_X86_64
1197 if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
1198 _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
1199 ~CPU_BASED_CR8_STORE_EXITING;
1200 #endif
1201 if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
1202 min2 = 0;
1203 opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
1204 SECONDARY_EXEC_WBINVD_EXITING |
1205 SECONDARY_EXEC_ENABLE_VPID |
1206 SECONDARY_EXEC_ENABLE_EPT;
1207 if (adjust_vmx_controls(min2, opt2,
1208 MSR_IA32_VMX_PROCBASED_CTLS2,
1209 &_cpu_based_2nd_exec_control) < 0)
1210 return -EIO;
1211 }
1212 #ifndef CONFIG_X86_64
1213 if (!(_cpu_based_2nd_exec_control &
1214 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
1215 _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW;
1216 #endif
1217 if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
1218 /* CR3 accesses and invlpg don't need to cause VM Exits when EPT
1219 enabled */
1220 min &= ~(CPU_BASED_CR3_LOAD_EXITING |
1221 CPU_BASED_CR3_STORE_EXITING |
1222 CPU_BASED_INVLPG_EXITING);
1223 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
1224 &_cpu_based_exec_control) < 0)
1225 return -EIO;
1226 rdmsr(MSR_IA32_VMX_EPT_VPID_CAP,
1227 vmx_capability.ept, vmx_capability.vpid);
1228 }
1229
1230 min = 0;
1231 #ifdef CONFIG_X86_64
1232 min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
1233 #endif
1234 opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT;
1235 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
1236 &_vmexit_control) < 0)
1237 return -EIO;
1238
1239 min = 0;
1240 opt = VM_ENTRY_LOAD_IA32_PAT;
1241 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
1242 &_vmentry_control) < 0)
1243 return -EIO;
1244
1245 rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
1246
1247 /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
1248 if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
1249 return -EIO;
1250
1251 #ifdef CONFIG_X86_64
1252 /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
1253 if (vmx_msr_high & (1u<<16))
1254 return -EIO;
1255 #endif
1256
1257 /* Require Write-Back (WB) memory type for VMCS accesses. */
1258 if (((vmx_msr_high >> 18) & 15) != 6)
1259 return -EIO;
1260
1261 vmcs_conf->size = vmx_msr_high & 0x1fff;
1262 vmcs_conf->order = get_order(vmcs_config.size);
1263 vmcs_conf->revision_id = vmx_msr_low;
1264
1265 vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
1266 vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
1267 vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
1268 vmcs_conf->vmexit_ctrl = _vmexit_control;
1269 vmcs_conf->vmentry_ctrl = _vmentry_control;
1270
1271 return 0;
1272 }
1273
1274 static struct vmcs *alloc_vmcs_cpu(int cpu)
1275 {
1276 int node = cpu_to_node(cpu);
1277 struct page *pages;
1278 struct vmcs *vmcs;
1279
1280 pages = alloc_pages_exact_node(node, GFP_KERNEL, vmcs_config.order);
1281 if (!pages)
1282 return NULL;
1283 vmcs = page_address(pages);
1284 memset(vmcs, 0, vmcs_config.size);
1285 vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
1286 return vmcs;
1287 }
1288
1289 static struct vmcs *alloc_vmcs(void)
1290 {
1291 return alloc_vmcs_cpu(raw_smp_processor_id());
1292 }
1293
1294 static void free_vmcs(struct vmcs *vmcs)
1295 {
1296 free_pages((unsigned long)vmcs, vmcs_config.order);
1297 }
1298
1299 static void free_kvm_area(void)
1300 {
1301 int cpu;
1302
1303 for_each_online_cpu(cpu)
1304 free_vmcs(per_cpu(vmxarea, cpu));
1305 }
1306
1307 static __init int alloc_kvm_area(void)
1308 {
1309 int cpu;
1310
1311 for_each_online_cpu(cpu) {
1312 struct vmcs *vmcs;
1313
1314 vmcs = alloc_vmcs_cpu(cpu);
1315 if (!vmcs) {
1316 free_kvm_area();
1317 return -ENOMEM;
1318 }
1319
1320 per_cpu(vmxarea, cpu) = vmcs;
1321 }
1322 return 0;
1323 }
1324
1325 static __init int hardware_setup(void)
1326 {
1327 if (setup_vmcs_config(&vmcs_config) < 0)
1328 return -EIO;
1329
1330 if (boot_cpu_has(X86_FEATURE_NX))
1331 kvm_enable_efer_bits(EFER_NX);
1332
1333 if (!cpu_has_vmx_vpid())
1334 enable_vpid = 0;
1335
1336 if (!cpu_has_vmx_ept())
1337 enable_ept = 0;
1338
1339 if (!cpu_has_vmx_flexpriority())
1340 flexpriority_enabled = 0;
1341
1342 if (!cpu_has_vmx_tpr_shadow())
1343 kvm_x86_ops->update_cr8_intercept = NULL;
1344
1345 return alloc_kvm_area();
1346 }
1347
1348 static __exit void hardware_unsetup(void)
1349 {
1350 free_kvm_area();
1351 }
1352
1353 static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
1354 {
1355 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1356
1357 if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
1358 vmcs_write16(sf->selector, save->selector);
1359 vmcs_writel(sf->base, save->base);
1360 vmcs_write32(sf->limit, save->limit);
1361 vmcs_write32(sf->ar_bytes, save->ar);
1362 } else {
1363 u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
1364 << AR_DPL_SHIFT;
1365 vmcs_write32(sf->ar_bytes, 0x93 | dpl);
1366 }
1367 }
1368
1369 static void enter_pmode(struct kvm_vcpu *vcpu)
1370 {
1371 unsigned long flags;
1372 struct vcpu_vmx *vmx = to_vmx(vcpu);
1373
1374 vmx->emulation_required = 1;
1375 vcpu->arch.rmode.vm86_active = 0;
1376
1377 vmcs_writel(GUEST_TR_BASE, vcpu->arch.rmode.tr.base);
1378 vmcs_write32(GUEST_TR_LIMIT, vcpu->arch.rmode.tr.limit);
1379 vmcs_write32(GUEST_TR_AR_BYTES, vcpu->arch.rmode.tr.ar);
1380
1381 flags = vmcs_readl(GUEST_RFLAGS);
1382 flags &= ~(X86_EFLAGS_IOPL | X86_EFLAGS_VM);
1383 flags |= (vcpu->arch.rmode.save_iopl << IOPL_SHIFT);
1384 vmcs_writel(GUEST_RFLAGS, flags);
1385
1386 vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
1387 (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
1388
1389 update_exception_bitmap(vcpu);
1390
1391 if (emulate_invalid_guest_state)
1392 return;
1393
1394 fix_pmode_dataseg(VCPU_SREG_ES, &vcpu->arch.rmode.es);
1395 fix_pmode_dataseg(VCPU_SREG_DS, &vcpu->arch.rmode.ds);
1396 fix_pmode_dataseg(VCPU_SREG_GS, &vcpu->arch.rmode.gs);
1397 fix_pmode_dataseg(VCPU_SREG_FS, &vcpu->arch.rmode.fs);
1398
1399 vmcs_write16(GUEST_SS_SELECTOR, 0);
1400 vmcs_write32(GUEST_SS_AR_BYTES, 0x93);
1401
1402 vmcs_write16(GUEST_CS_SELECTOR,
1403 vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK);
1404 vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
1405 }
1406
1407 static gva_t rmode_tss_base(struct kvm *kvm)
1408 {
1409 if (!kvm->arch.tss_addr) {
1410 gfn_t base_gfn = kvm->memslots[0].base_gfn +
1411 kvm->memslots[0].npages - 3;
1412 return base_gfn << PAGE_SHIFT;
1413 }
1414 return kvm->arch.tss_addr;
1415 }
1416
1417 static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
1418 {
1419 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1420
1421 save->selector = vmcs_read16(sf->selector);
1422 save->base = vmcs_readl(sf->base);
1423 save->limit = vmcs_read32(sf->limit);
1424 save->ar = vmcs_read32(sf->ar_bytes);
1425 vmcs_write16(sf->selector, save->base >> 4);
1426 vmcs_write32(sf->base, save->base & 0xfffff);
1427 vmcs_write32(sf->limit, 0xffff);
1428 vmcs_write32(sf->ar_bytes, 0xf3);
1429 }
1430
1431 static void enter_rmode(struct kvm_vcpu *vcpu)
1432 {
1433 unsigned long flags;
1434 struct vcpu_vmx *vmx = to_vmx(vcpu);
1435
1436 vmx->emulation_required = 1;
1437 vcpu->arch.rmode.vm86_active = 1;
1438
1439 vcpu->arch.rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
1440 vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));
1441
1442 vcpu->arch.rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
1443 vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);
1444
1445 vcpu->arch.rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
1446 vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
1447
1448 flags = vmcs_readl(GUEST_RFLAGS);
1449 vcpu->arch.rmode.save_iopl
1450 = (flags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
1451
1452 flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
1453
1454 vmcs_writel(GUEST_RFLAGS, flags);
1455 vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
1456 update_exception_bitmap(vcpu);
1457
1458 if (emulate_invalid_guest_state)
1459 goto continue_rmode;
1460
1461 vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
1462 vmcs_write32(GUEST_SS_LIMIT, 0xffff);
1463 vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
1464
1465 vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
1466 vmcs_write32(GUEST_CS_LIMIT, 0xffff);
1467 if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
1468 vmcs_writel(GUEST_CS_BASE, 0xf0000);
1469 vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);
1470
1471 fix_rmode_seg(VCPU_SREG_ES, &vcpu->arch.rmode.es);
1472 fix_rmode_seg(VCPU_SREG_DS, &vcpu->arch.rmode.ds);
1473 fix_rmode_seg(VCPU_SREG_GS, &vcpu->arch.rmode.gs);
1474 fix_rmode_seg(VCPU_SREG_FS, &vcpu->arch.rmode.fs);
1475
1476 continue_rmode:
1477 kvm_mmu_reset_context(vcpu);
1478 init_rmode(vcpu->kvm);
1479 }
1480
1481 static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
1482 {
1483 struct vcpu_vmx *vmx = to_vmx(vcpu);
1484 struct kvm_msr_entry *msr = find_msr_entry(vmx, MSR_EFER);
1485
1486 vcpu->arch.shadow_efer = efer;
1487 if (!msr)
1488 return;
1489 if (efer & EFER_LMA) {
1490 vmcs_write32(VM_ENTRY_CONTROLS,
1491 vmcs_read32(VM_ENTRY_CONTROLS) |
1492 VM_ENTRY_IA32E_MODE);
1493 msr->data = efer;
1494 } else {
1495 vmcs_write32(VM_ENTRY_CONTROLS,
1496 vmcs_read32(VM_ENTRY_CONTROLS) &
1497 ~VM_ENTRY_IA32E_MODE);
1498
1499 msr->data = efer & ~EFER_LME;
1500 }
1501 setup_msrs(vmx);
1502 }
1503
1504 #ifdef CONFIG_X86_64
1505
1506 static void enter_lmode(struct kvm_vcpu *vcpu)
1507 {
1508 u32 guest_tr_ar;
1509
1510 guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
1511 if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
1512 printk(KERN_DEBUG "%s: tss fixup for long mode. \n",
1513 __func__);
1514 vmcs_write32(GUEST_TR_AR_BYTES,
1515 (guest_tr_ar & ~AR_TYPE_MASK)
1516 | AR_TYPE_BUSY_64_TSS);
1517 }
1518 vcpu->arch.shadow_efer |= EFER_LMA;
1519 vmx_set_efer(vcpu, vcpu->arch.shadow_efer);
1520 }
1521
1522 static void exit_lmode(struct kvm_vcpu *vcpu)
1523 {
1524 vcpu->arch.shadow_efer &= ~EFER_LMA;
1525
1526 vmcs_write32(VM_ENTRY_CONTROLS,
1527 vmcs_read32(VM_ENTRY_CONTROLS)
1528 & ~VM_ENTRY_IA32E_MODE);
1529 }
1530
1531 #endif
1532
1533 static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
1534 {
1535 vpid_sync_vcpu_all(to_vmx(vcpu));
1536 if (enable_ept)
1537 ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa));
1538 }
1539
1540 static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
1541 {
1542 vcpu->arch.cr4 &= KVM_GUEST_CR4_MASK;
1543 vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK;
1544 }
1545
1546 static void ept_load_pdptrs(struct kvm_vcpu *vcpu)
1547 {
1548 if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
1549 if (!load_pdptrs(vcpu, vcpu->arch.cr3)) {
1550 printk(KERN_ERR "EPT: Fail to load pdptrs!\n");
1551 return;
1552 }
1553 vmcs_write64(GUEST_PDPTR0, vcpu->arch.pdptrs[0]);
1554 vmcs_write64(GUEST_PDPTR1, vcpu->arch.pdptrs[1]);
1555 vmcs_write64(GUEST_PDPTR2, vcpu->arch.pdptrs[2]);
1556 vmcs_write64(GUEST_PDPTR3, vcpu->arch.pdptrs[3]);
1557 }
1558 }
1559
1560 static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
1561
1562 static void ept_update_paging_mode_cr0(unsigned long *hw_cr0,
1563 unsigned long cr0,
1564 struct kvm_vcpu *vcpu)
1565 {
1566 if (!(cr0 & X86_CR0_PG)) {
1567 /* From paging/starting to nonpaging */
1568 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
1569 vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) |
1570 (CPU_BASED_CR3_LOAD_EXITING |
1571 CPU_BASED_CR3_STORE_EXITING));
1572 vcpu->arch.cr0 = cr0;
1573 vmx_set_cr4(vcpu, vcpu->arch.cr4);
1574 *hw_cr0 |= X86_CR0_PE | X86_CR0_PG;
1575 *hw_cr0 &= ~X86_CR0_WP;
1576 } else if (!is_paging(vcpu)) {
1577 /* From nonpaging to paging */
1578 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
1579 vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) &
1580 ~(CPU_BASED_CR3_LOAD_EXITING |
1581 CPU_BASED_CR3_STORE_EXITING));
1582 vcpu->arch.cr0 = cr0;
1583 vmx_set_cr4(vcpu, vcpu->arch.cr4);
1584 if (!(vcpu->arch.cr0 & X86_CR0_WP))
1585 *hw_cr0 &= ~X86_CR0_WP;
1586 }
1587 }
1588
1589 static void ept_update_paging_mode_cr4(unsigned long *hw_cr4,
1590 struct kvm_vcpu *vcpu)
1591 {
1592 if (!is_paging(vcpu)) {
1593 *hw_cr4 &= ~X86_CR4_PAE;
1594 *hw_cr4 |= X86_CR4_PSE;
1595 } else if (!(vcpu->arch.cr4 & X86_CR4_PAE))
1596 *hw_cr4 &= ~X86_CR4_PAE;
1597 }
1598
1599 static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
1600 {
1601 unsigned long hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) |
1602 KVM_VM_CR0_ALWAYS_ON;
1603
1604 vmx_fpu_deactivate(vcpu);
1605
1606 if (vcpu->arch.rmode.vm86_active && (cr0 & X86_CR0_PE))
1607 enter_pmode(vcpu);
1608
1609 if (!vcpu->arch.rmode.vm86_active && !(cr0 & X86_CR0_PE))
1610 enter_rmode(vcpu);
1611
1612 #ifdef CONFIG_X86_64
1613 if (vcpu->arch.shadow_efer & EFER_LME) {
1614 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
1615 enter_lmode(vcpu);
1616 if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
1617 exit_lmode(vcpu);
1618 }
1619 #endif
1620
1621 if (enable_ept)
1622 ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu);
1623
1624 vmcs_writel(CR0_READ_SHADOW, cr0);
1625 vmcs_writel(GUEST_CR0, hw_cr0);
1626 vcpu->arch.cr0 = cr0;
1627
1628 if (!(cr0 & X86_CR0_TS) || !(cr0 & X86_CR0_PE))
1629 vmx_fpu_activate(vcpu);
1630 }
1631
1632 static u64 construct_eptp(unsigned long root_hpa)
1633 {
1634 u64 eptp;
1635
1636 /* TODO write the value reading from MSR */
1637 eptp = VMX_EPT_DEFAULT_MT |
1638 VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
1639 eptp |= (root_hpa & PAGE_MASK);
1640
1641 return eptp;
1642 }
1643
1644 static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
1645 {
1646 unsigned long guest_cr3;
1647 u64 eptp;
1648
1649 guest_cr3 = cr3;
1650 if (enable_ept) {
1651 eptp = construct_eptp(cr3);
1652 vmcs_write64(EPT_POINTER, eptp);
1653 ept_sync_context(eptp);
1654 ept_load_pdptrs(vcpu);
1655 guest_cr3 = is_paging(vcpu) ? vcpu->arch.cr3 :
1656 VMX_EPT_IDENTITY_PAGETABLE_ADDR;
1657 }
1658
1659 vmx_flush_tlb(vcpu);
1660 vmcs_writel(GUEST_CR3, guest_cr3);
1661 if (vcpu->arch.cr0 & X86_CR0_PE)
1662 vmx_fpu_deactivate(vcpu);
1663 }
1664
1665 static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
1666 {
1667 unsigned long hw_cr4 = cr4 | (vcpu->arch.rmode.vm86_active ?
1668 KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON);
1669
1670 vcpu->arch.cr4 = cr4;
1671 if (enable_ept)
1672 ept_update_paging_mode_cr4(&hw_cr4, vcpu);
1673
1674 vmcs_writel(CR4_READ_SHADOW, cr4);
1675 vmcs_writel(GUEST_CR4, hw_cr4);
1676 }
1677
1678 static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
1679 {
1680 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1681
1682 return vmcs_readl(sf->base);
1683 }
1684
1685 static void vmx_get_segment(struct kvm_vcpu *vcpu,
1686 struct kvm_segment *var, int seg)
1687 {
1688 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1689 u32 ar;
1690
1691 var->base = vmcs_readl(sf->base);
1692 var->limit = vmcs_read32(sf->limit);
1693 var->selector = vmcs_read16(sf->selector);
1694 ar = vmcs_read32(sf->ar_bytes);
1695 if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state)
1696 ar = 0;
1697 var->type = ar & 15;
1698 var->s = (ar >> 4) & 1;
1699 var->dpl = (ar >> 5) & 3;
1700 var->present = (ar >> 7) & 1;
1701 var->avl = (ar >> 12) & 1;
1702 var->l = (ar >> 13) & 1;
1703 var->db = (ar >> 14) & 1;
1704 var->g = (ar >> 15) & 1;
1705 var->unusable = (ar >> 16) & 1;
1706 }
1707
1708 static int vmx_get_cpl(struct kvm_vcpu *vcpu)
1709 {
1710 struct kvm_segment kvm_seg;
1711
1712 if (!(vcpu->arch.cr0 & X86_CR0_PE)) /* if real mode */
1713 return 0;
1714
1715 if (vmx_get_rflags(vcpu) & X86_EFLAGS_VM) /* if virtual 8086 */
1716 return 3;
1717
1718 vmx_get_segment(vcpu, &kvm_seg, VCPU_SREG_CS);
1719 return kvm_seg.selector & 3;
1720 }
1721
1722 static u32 vmx_segment_access_rights(struct kvm_segment *var)
1723 {
1724 u32 ar;
1725
1726 if (var->unusable)
1727 ar = 1 << 16;
1728 else {
1729 ar = var->type & 15;
1730 ar |= (var->s & 1) << 4;
1731 ar |= (var->dpl & 3) << 5;
1732 ar |= (var->present & 1) << 7;
1733 ar |= (var->avl & 1) << 12;
1734 ar |= (var->l & 1) << 13;
1735 ar |= (var->db & 1) << 14;
1736 ar |= (var->g & 1) << 15;
1737 }
1738 if (ar == 0) /* a 0 value means unusable */
1739 ar = AR_UNUSABLE_MASK;
1740
1741 return ar;
1742 }
1743
1744 static void vmx_set_segment(struct kvm_vcpu *vcpu,
1745 struct kvm_segment *var, int seg)
1746 {
1747 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1748 u32 ar;
1749
1750 if (vcpu->arch.rmode.vm86_active && seg == VCPU_SREG_TR) {
1751 vcpu->arch.rmode.tr.selector = var->selector;
1752 vcpu->arch.rmode.tr.base = var->base;
1753 vcpu->arch.rmode.tr.limit = var->limit;
1754 vcpu->arch.rmode.tr.ar = vmx_segment_access_rights(var);
1755 return;
1756 }
1757 vmcs_writel(sf->base, var->base);
1758 vmcs_write32(sf->limit, var->limit);
1759 vmcs_write16(sf->selector, var->selector);
1760 if (vcpu->arch.rmode.vm86_active && var->s) {
1761 /*
1762 * Hack real-mode segments into vm86 compatibility.
1763 */
1764 if (var->base == 0xffff0000 && var->selector == 0xf000)
1765 vmcs_writel(sf->base, 0xf0000);
1766 ar = 0xf3;
1767 } else
1768 ar = vmx_segment_access_rights(var);
1769 vmcs_write32(sf->ar_bytes, ar);
1770 }
1771
1772 static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
1773 {
1774 u32 ar = vmcs_read32(GUEST_CS_AR_BYTES);
1775
1776 *db = (ar >> 14) & 1;
1777 *l = (ar >> 13) & 1;
1778 }
1779
1780 static void vmx_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1781 {
1782 dt->limit = vmcs_read32(GUEST_IDTR_LIMIT);
1783 dt->base = vmcs_readl(GUEST_IDTR_BASE);
1784 }
1785
1786 static void vmx_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1787 {
1788 vmcs_write32(GUEST_IDTR_LIMIT, dt->limit);
1789 vmcs_writel(GUEST_IDTR_BASE, dt->base);
1790 }
1791
1792 static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1793 {
1794 dt->limit = vmcs_read32(GUEST_GDTR_LIMIT);
1795 dt->base = vmcs_readl(GUEST_GDTR_BASE);
1796 }
1797
1798 static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1799 {
1800 vmcs_write32(GUEST_GDTR_LIMIT, dt->limit);
1801 vmcs_writel(GUEST_GDTR_BASE, dt->base);
1802 }
1803
1804 static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
1805 {
1806 struct kvm_segment var;
1807 u32 ar;
1808
1809 vmx_get_segment(vcpu, &var, seg);
1810 ar = vmx_segment_access_rights(&var);
1811
1812 if (var.base != (var.selector << 4))
1813 return false;
1814 if (var.limit != 0xffff)
1815 return false;
1816 if (ar != 0xf3)
1817 return false;
1818
1819 return true;
1820 }
1821
1822 static bool code_segment_valid(struct kvm_vcpu *vcpu)
1823 {
1824 struct kvm_segment cs;
1825 unsigned int cs_rpl;
1826
1827 vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
1828 cs_rpl = cs.selector & SELECTOR_RPL_MASK;
1829
1830 if (cs.unusable)
1831 return false;
1832 if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK))
1833 return false;
1834 if (!cs.s)
1835 return false;
1836 if (cs.type & AR_TYPE_WRITEABLE_MASK) {
1837 if (cs.dpl > cs_rpl)
1838 return false;
1839 } else {
1840 if (cs.dpl != cs_rpl)
1841 return false;
1842 }
1843 if (!cs.present)
1844 return false;
1845
1846 /* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */
1847 return true;
1848 }
1849
1850 static bool stack_segment_valid(struct kvm_vcpu *vcpu)
1851 {
1852 struct kvm_segment ss;
1853 unsigned int ss_rpl;
1854
1855 vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
1856 ss_rpl = ss.selector & SELECTOR_RPL_MASK;
1857
1858 if (ss.unusable)
1859 return true;
1860 if (ss.type != 3 && ss.type != 7)
1861 return false;
1862 if (!ss.s)
1863 return false;
1864 if (ss.dpl != ss_rpl) /* DPL != RPL */
1865 return false;
1866 if (!ss.present)
1867 return false;
1868
1869 return true;
1870 }
1871
1872 static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg)
1873 {
1874 struct kvm_segment var;
1875 unsigned int rpl;
1876
1877 vmx_get_segment(vcpu, &var, seg);
1878 rpl = var.selector & SELECTOR_RPL_MASK;
1879
1880 if (var.unusable)
1881 return true;
1882 if (!var.s)
1883 return false;
1884 if (!var.present)
1885 return false;
1886 if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) {
1887 if (var.dpl < rpl) /* DPL < RPL */
1888 return false;
1889 }
1890
1891 /* TODO: Add other members to kvm_segment_field to allow checking for other access
1892 * rights flags
1893 */
1894 return true;
1895 }
1896
1897 static bool tr_valid(struct kvm_vcpu *vcpu)
1898 {
1899 struct kvm_segment tr;
1900
1901 vmx_get_segment(vcpu, &tr, VCPU_SREG_TR);
1902
1903 if (tr.unusable)
1904 return false;
1905 if (tr.selector & SELECTOR_TI_MASK) /* TI = 1 */
1906 return false;
1907 if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */
1908 return false;
1909 if (!tr.present)
1910 return false;
1911
1912 return true;
1913 }
1914
1915 static bool ldtr_valid(struct kvm_vcpu *vcpu)
1916 {
1917 struct kvm_segment ldtr;
1918
1919 vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR);
1920
1921 if (ldtr.unusable)
1922 return true;
1923 if (ldtr.selector & SELECTOR_TI_MASK) /* TI = 1 */
1924 return false;
1925 if (ldtr.type != 2)
1926 return false;
1927 if (!ldtr.present)
1928 return false;
1929
1930 return true;
1931 }
1932
1933 static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu)
1934 {
1935 struct kvm_segment cs, ss;
1936
1937 vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
1938 vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
1939
1940 return ((cs.selector & SELECTOR_RPL_MASK) ==
1941 (ss.selector & SELECTOR_RPL_MASK));
1942 }
1943
1944 /*
1945 * Check if guest state is valid. Returns true if valid, false if
1946 * not.
1947 * We assume that registers are always usable
1948 */
1949 static bool guest_state_valid(struct kvm_vcpu *vcpu)
1950 {
1951 /* real mode guest state checks */
1952 if (!(vcpu->arch.cr0 & X86_CR0_PE)) {
1953 if (!rmode_segment_valid(vcpu, VCPU_SREG_CS))
1954 return false;
1955 if (!rmode_segment_valid(vcpu, VCPU_SREG_SS))
1956 return false;
1957 if (!rmode_segment_valid(vcpu, VCPU_SREG_DS))
1958 return false;
1959 if (!rmode_segment_valid(vcpu, VCPU_SREG_ES))
1960 return false;
1961 if (!rmode_segment_valid(vcpu, VCPU_SREG_FS))
1962 return false;
1963 if (!rmode_segment_valid(vcpu, VCPU_SREG_GS))
1964 return false;
1965 } else {
1966 /* protected mode guest state checks */
1967 if (!cs_ss_rpl_check(vcpu))
1968 return false;
1969 if (!code_segment_valid(vcpu))
1970 return false;
1971 if (!stack_segment_valid(vcpu))
1972 return false;
1973 if (!data_segment_valid(vcpu, VCPU_SREG_DS))
1974 return false;
1975 if (!data_segment_valid(vcpu, VCPU_SREG_ES))
1976 return false;
1977 if (!data_segment_valid(vcpu, VCPU_SREG_FS))
1978 return false;
1979 if (!data_segment_valid(vcpu, VCPU_SREG_GS))
1980 return false;
1981 if (!tr_valid(vcpu))
1982 return false;
1983 if (!ldtr_valid(vcpu))
1984 return false;
1985 }
1986 /* TODO:
1987 * - Add checks on RIP
1988 * - Add checks on RFLAGS
1989 */
1990
1991 return true;
1992 }
1993
1994 static int init_rmode_tss(struct kvm *kvm)
1995 {
1996 gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
1997 u16 data = 0;
1998 int ret = 0;
1999 int r;
2000
2001 r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
2002 if (r < 0)
2003 goto out;
2004 data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
2005 r = kvm_write_guest_page(kvm, fn++, &data,
2006 TSS_IOPB_BASE_OFFSET, sizeof(u16));
2007 if (r < 0)
2008 goto out;
2009 r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE);
2010 if (r < 0)
2011 goto out;
2012 r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
2013 if (r < 0)
2014 goto out;
2015 data = ~0;
2016 r = kvm_write_guest_page(kvm, fn, &data,
2017 RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1,
2018 sizeof(u8));
2019 if (r < 0)
2020 goto out;
2021
2022 ret = 1;
2023 out:
2024 return ret;
2025 }
2026
2027 static int init_rmode_identity_map(struct kvm *kvm)
2028 {
2029 int i, r, ret;
2030 pfn_t identity_map_pfn;
2031 u32 tmp;
2032
2033 if (!enable_ept)
2034 return 1;
2035 if (unlikely(!kvm->arch.ept_identity_pagetable)) {
2036 printk(KERN_ERR "EPT: identity-mapping pagetable "
2037 "haven't been allocated!\n");
2038 return 0;
2039 }
2040 if (likely(kvm->arch.ept_identity_pagetable_done))
2041 return 1;
2042 ret = 0;
2043 identity_map_pfn = VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT;
2044 r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE);
2045 if (r < 0)
2046 goto out;
2047 /* Set up identity-mapping pagetable for EPT in real mode */
2048 for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
2049 tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
2050 _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
2051 r = kvm_write_guest_page(kvm, identity_map_pfn,
2052 &tmp, i * sizeof(tmp), sizeof(tmp));
2053 if (r < 0)
2054 goto out;
2055 }
2056 kvm->arch.ept_identity_pagetable_done = true;
2057 ret = 1;
2058 out:
2059 return ret;
2060 }
2061
2062 static void seg_setup(int seg)
2063 {
2064 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
2065
2066 vmcs_write16(sf->selector, 0);
2067 vmcs_writel(sf->base, 0);
2068 vmcs_write32(sf->limit, 0xffff);
2069 vmcs_write32(sf->ar_bytes, 0xf3);
2070 }
2071
2072 static int alloc_apic_access_page(struct kvm *kvm)
2073 {
2074 struct kvm_userspace_memory_region kvm_userspace_mem;
2075 int r = 0;
2076
2077 down_write(&kvm->slots_lock);
2078 if (kvm->arch.apic_access_page)
2079 goto out;
2080 kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
2081 kvm_userspace_mem.flags = 0;
2082 kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL;
2083 kvm_userspace_mem.memory_size = PAGE_SIZE;
2084 r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
2085 if (r)
2086 goto out;
2087
2088 kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
2089 out:
2090 up_write(&kvm->slots_lock);
2091 return r;
2092 }
2093
2094 static int alloc_identity_pagetable(struct kvm *kvm)
2095 {
2096 struct kvm_userspace_memory_region kvm_userspace_mem;
2097 int r = 0;
2098
2099 down_write(&kvm->slots_lock);
2100 if (kvm->arch.ept_identity_pagetable)
2101 goto out;
2102 kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
2103 kvm_userspace_mem.flags = 0;
2104 kvm_userspace_mem.guest_phys_addr = VMX_EPT_IDENTITY_PAGETABLE_ADDR;
2105 kvm_userspace_mem.memory_size = PAGE_SIZE;
2106 r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
2107 if (r)
2108 goto out;
2109
2110 kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
2111 VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT);
2112 out:
2113 up_write(&kvm->slots_lock);
2114 return r;
2115 }
2116
2117 static void allocate_vpid(struct vcpu_vmx *vmx)
2118 {
2119 int vpid;
2120
2121 vmx->vpid = 0;
2122 if (!enable_vpid)
2123 return;
2124 spin_lock(&vmx_vpid_lock);
2125 vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS);
2126 if (vpid < VMX_NR_VPIDS) {
2127 vmx->vpid = vpid;
2128 __set_bit(vpid, vmx_vpid_bitmap);
2129 }
2130 spin_unlock(&vmx_vpid_lock);
2131 }
2132
2133 static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr)
2134 {
2135 int f = sizeof(unsigned long);
2136
2137 if (!cpu_has_vmx_msr_bitmap())
2138 return;
2139
2140 /*
2141 * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals
2142 * have the write-low and read-high bitmap offsets the wrong way round.
2143 * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff.
2144 */
2145 if (msr <= 0x1fff) {
2146 __clear_bit(msr, msr_bitmap + 0x000 / f); /* read-low */
2147 __clear_bit(msr, msr_bitmap + 0x800 / f); /* write-low */
2148 } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
2149 msr &= 0x1fff;
2150 __clear_bit(msr, msr_bitmap + 0x400 / f); /* read-high */
2151 __clear_bit(msr, msr_bitmap + 0xc00 / f); /* write-high */
2152 }
2153 }
2154
2155 static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only)
2156 {
2157 if (!longmode_only)
2158 __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy, msr);
2159 __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode, msr);
2160 }
2161
2162 /*
2163 * Sets up the vmcs for emulated real mode.
2164 */
2165 static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
2166 {
2167 u32 host_sysenter_cs, msr_low, msr_high;
2168 u32 junk;
2169 u64 host_pat, tsc_this, tsc_base;
2170 unsigned long a;
2171 struct descriptor_table dt;
2172 int i;
2173 unsigned long kvm_vmx_return;
2174 u32 exec_control;
2175
2176 /* I/O */
2177 vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a));
2178 vmcs_write64(IO_BITMAP_B, __pa(vmx_io_bitmap_b));
2179
2180 if (cpu_has_vmx_msr_bitmap())
2181 vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap_legacy));
2182
2183 vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
2184
2185 /* Control */
2186 vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
2187 vmcs_config.pin_based_exec_ctrl);
2188
2189 exec_control = vmcs_config.cpu_based_exec_ctrl;
2190 if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) {
2191 exec_control &= ~CPU_BASED_TPR_SHADOW;
2192 #ifdef CONFIG_X86_64
2193 exec_control |= CPU_BASED_CR8_STORE_EXITING |
2194 CPU_BASED_CR8_LOAD_EXITING;
2195 #endif
2196 }
2197 if (!enable_ept)
2198 exec_control |= CPU_BASED_CR3_STORE_EXITING |
2199 CPU_BASED_CR3_LOAD_EXITING |
2200 CPU_BASED_INVLPG_EXITING;
2201 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
2202
2203 if (cpu_has_secondary_exec_ctrls()) {
2204 exec_control = vmcs_config.cpu_based_2nd_exec_ctrl;
2205 if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
2206 exec_control &=
2207 ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
2208 if (vmx->vpid == 0)
2209 exec_control &= ~SECONDARY_EXEC_ENABLE_VPID;
2210 if (!enable_ept)
2211 exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
2212 vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
2213 }
2214
2215 vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, !!bypass_guest_pf);
2216 vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, !!bypass_guest_pf);
2217 vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */
2218
2219 vmcs_writel(HOST_CR0, read_cr0()); /* 22.2.3 */
2220 vmcs_writel(HOST_CR4, read_cr4()); /* 22.2.3, 22.2.5 */
2221 vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */
2222
2223 vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */
2224 vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
2225 vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS); /* 22.2.4 */
2226 vmcs_write16(HOST_FS_SELECTOR, kvm_read_fs()); /* 22.2.4 */
2227 vmcs_write16(HOST_GS_SELECTOR, kvm_read_gs()); /* 22.2.4 */
2228 vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
2229 #ifdef CONFIG_X86_64
2230 rdmsrl(MSR_FS_BASE, a);
2231 vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
2232 rdmsrl(MSR_GS_BASE, a);
2233 vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
2234 #else
2235 vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
2236 vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
2237 #endif
2238
2239 vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */
2240
2241 kvm_get_idt(&dt);
2242 vmcs_writel(HOST_IDTR_BASE, dt.base); /* 22.2.4 */
2243
2244 asm("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return));
2245 vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */
2246 vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
2247 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
2248 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
2249
2250 rdmsr(MSR_IA32_SYSENTER_CS, host_sysenter_cs, junk);
2251 vmcs_write32(HOST_IA32_SYSENTER_CS, host_sysenter_cs);
2252 rdmsrl(MSR_IA32_SYSENTER_ESP, a);
2253 vmcs_writel(HOST_IA32_SYSENTER_ESP, a); /* 22.2.3 */
2254 rdmsrl(MSR_IA32_SYSENTER_EIP, a);
2255 vmcs_writel(HOST_IA32_SYSENTER_EIP, a); /* 22.2.3 */
2256
2257 if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) {
2258 rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
2259 host_pat = msr_low | ((u64) msr_high << 32);
2260 vmcs_write64(HOST_IA32_PAT, host_pat);
2261 }
2262 if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
2263 rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
2264 host_pat = msr_low | ((u64) msr_high << 32);
2265 /* Write the default value follow host pat */
2266 vmcs_write64(GUEST_IA32_PAT, host_pat);
2267 /* Keep arch.pat sync with GUEST_IA32_PAT */
2268 vmx->vcpu.arch.pat = host_pat;
2269 }
2270
2271 for (i = 0; i < NR_VMX_MSR; ++i) {
2272 u32 index = vmx_msr_index[i];
2273 u32 data_low, data_high;
2274 u64 data;
2275 int j = vmx->nmsrs;
2276
2277 if (rdmsr_safe(index, &data_low, &data_high) < 0)
2278 continue;
2279 if (wrmsr_safe(index, data_low, data_high) < 0)
2280 continue;
2281 data = data_low | ((u64)data_high << 32);
2282 vmx->host_msrs[j].index = index;
2283 vmx->host_msrs[j].reserved = 0;
2284 vmx->host_msrs[j].data = data;
2285 vmx->guest_msrs[j] = vmx->host_msrs[j];
2286 ++vmx->nmsrs;
2287 }
2288
2289 vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
2290
2291 /* 22.2.1, 20.8.1 */
2292 vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);
2293
2294 vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
2295 vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK);
2296
2297 tsc_base = vmx->vcpu.kvm->arch.vm_init_tsc;
2298 rdtscll(tsc_this);
2299 if (tsc_this < vmx->vcpu.kvm->arch.vm_init_tsc)
2300 tsc_base = tsc_this;
2301
2302 guest_write_tsc(0, tsc_base);
2303
2304 return 0;
2305 }
2306
2307 static int init_rmode(struct kvm *kvm)
2308 {
2309 if (!init_rmode_tss(kvm))
2310 return 0;
2311 if (!init_rmode_identity_map(kvm))
2312 return 0;
2313 return 1;
2314 }
2315
2316 static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
2317 {
2318 struct vcpu_vmx *vmx = to_vmx(vcpu);
2319 u64 msr;
2320 int ret;
2321
2322 vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
2323 down_read(&vcpu->kvm->slots_lock);
2324 if (!init_rmode(vmx->vcpu.kvm)) {
2325 ret = -ENOMEM;
2326 goto out;
2327 }
2328
2329 vmx->vcpu.arch.rmode.vm86_active = 0;
2330
2331 vmx->soft_vnmi_blocked = 0;
2332
2333 vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
2334 kvm_set_cr8(&vmx->vcpu, 0);
2335 msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
2336 if (vmx->vcpu.vcpu_id == 0)
2337 msr |= MSR_IA32_APICBASE_BSP;
2338 kvm_set_apic_base(&vmx->vcpu, msr);
2339
2340 fx_init(&vmx->vcpu);
2341
2342 seg_setup(VCPU_SREG_CS);
2343 /*
2344 * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
2345 * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4. Sigh.
2346 */
2347 if (vmx->vcpu.vcpu_id == 0) {
2348 vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
2349 vmcs_writel(GUEST_CS_BASE, 0x000f0000);
2350 } else {
2351 vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8);
2352 vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12);
2353 }
2354
2355 seg_setup(VCPU_SREG_DS);
2356 seg_setup(VCPU_SREG_ES);
2357 seg_setup(VCPU_SREG_FS);
2358 seg_setup(VCPU_SREG_GS);
2359 seg_setup(VCPU_SREG_SS);
2360
2361 vmcs_write16(GUEST_TR_SELECTOR, 0);
2362 vmcs_writel(GUEST_TR_BASE, 0);
2363 vmcs_write32(GUEST_TR_LIMIT, 0xffff);
2364 vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
2365
2366 vmcs_write16(GUEST_LDTR_SELECTOR, 0);
2367 vmcs_writel(GUEST_LDTR_BASE, 0);
2368 vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
2369 vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);
2370
2371 vmcs_write32(GUEST_SYSENTER_CS, 0);
2372 vmcs_writel(GUEST_SYSENTER_ESP, 0);
2373 vmcs_writel(GUEST_SYSENTER_EIP, 0);
2374
2375 vmcs_writel(GUEST_RFLAGS, 0x02);
2376 if (vmx->vcpu.vcpu_id == 0)
2377 kvm_rip_write(vcpu, 0xfff0);
2378 else
2379 kvm_rip_write(vcpu, 0);
2380 kvm_register_write(vcpu, VCPU_REGS_RSP, 0);
2381
2382 vmcs_writel(GUEST_DR7, 0x400);
2383
2384 vmcs_writel(GUEST_GDTR_BASE, 0);
2385 vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);
2386
2387 vmcs_writel(GUEST_IDTR_BASE, 0);
2388 vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);
2389
2390 vmcs_write32(GUEST_ACTIVITY_STATE, 0);
2391 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
2392 vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);
2393
2394 /* Special registers */
2395 vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
2396
2397 setup_msrs(vmx);
2398
2399 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */
2400
2401 if (cpu_has_vmx_tpr_shadow()) {
2402 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0);
2403 if (vm_need_tpr_shadow(vmx->vcpu.kvm))
2404 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR,
2405 page_to_phys(vmx->vcpu.arch.apic->regs_page));
2406 vmcs_write32(TPR_THRESHOLD, 0);
2407 }
2408
2409 if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
2410 vmcs_write64(APIC_ACCESS_ADDR,
2411 page_to_phys(vmx->vcpu.kvm->arch.apic_access_page));
2412
2413 if (vmx->vpid != 0)
2414 vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
2415
2416 vmx->vcpu.arch.cr0 = 0x60000010;
2417 vmx_set_cr0(&vmx->vcpu, vmx->vcpu.arch.cr0); /* enter rmode */
2418 vmx_set_cr4(&vmx->vcpu, 0);
2419 vmx_set_efer(&vmx->vcpu, 0);
2420 vmx_fpu_activate(&vmx->vcpu);
2421 update_exception_bitmap(&vmx->vcpu);
2422
2423 vpid_sync_vcpu_all(vmx);
2424
2425 ret = 0;
2426
2427 /* HACK: Don't enable emulation on guest boot/reset */
2428 vmx->emulation_required = 0;
2429
2430 out:
2431 up_read(&vcpu->kvm->slots_lock);
2432 return ret;
2433 }
2434
2435 static void enable_irq_window(struct kvm_vcpu *vcpu)
2436 {
2437 u32 cpu_based_vm_exec_control;
2438
2439 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
2440 cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
2441 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
2442 }
2443
2444 static void enable_nmi_window(struct kvm_vcpu *vcpu)
2445 {
2446 u32 cpu_based_vm_exec_control;
2447
2448 if (!cpu_has_virtual_nmis()) {
2449 enable_irq_window(vcpu);
2450 return;
2451 }
2452
2453 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
2454 cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING;
2455 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
2456 }
2457
2458 static void vmx_inject_irq(struct kvm_vcpu *vcpu)
2459 {
2460 struct vcpu_vmx *vmx = to_vmx(vcpu);
2461 uint32_t intr;
2462 int irq = vcpu->arch.interrupt.nr;
2463
2464 KVMTRACE_1D(INJ_VIRQ, vcpu, (u32)irq, handler);
2465
2466 ++vcpu->stat.irq_injections;
2467 if (vcpu->arch.rmode.vm86_active) {
2468 vmx->rmode.irq.pending = true;
2469 vmx->rmode.irq.vector = irq;
2470 vmx->rmode.irq.rip = kvm_rip_read(vcpu);
2471 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2472 irq | INTR_TYPE_SOFT_INTR | INTR_INFO_VALID_MASK);
2473 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
2474 kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
2475 return;
2476 }
2477 intr = irq | INTR_INFO_VALID_MASK;
2478 if (vcpu->arch.interrupt.soft) {
2479 intr |= INTR_TYPE_SOFT_INTR;
2480 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
2481 vmx->vcpu.arch.event_exit_inst_len);
2482 } else
2483 intr |= INTR_TYPE_EXT_INTR;
2484 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr);
2485 }
2486
2487 static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
2488 {
2489 struct vcpu_vmx *vmx = to_vmx(vcpu);
2490
2491 if (!cpu_has_virtual_nmis()) {
2492 /*
2493 * Tracking the NMI-blocked state in software is built upon
2494 * finding the next open IRQ window. This, in turn, depends on
2495 * well-behaving guests: They have to keep IRQs disabled at
2496 * least as long as the NMI handler runs. Otherwise we may
2497 * cause NMI nesting, maybe breaking the guest. But as this is
2498 * highly unlikely, we can live with the residual risk.
2499 */
2500 vmx->soft_vnmi_blocked = 1;
2501 vmx->vnmi_blocked_time = 0;
2502 }
2503
2504 ++vcpu->stat.nmi_injections;
2505 if (vcpu->arch.rmode.vm86_active) {
2506 vmx->rmode.irq.pending = true;
2507 vmx->rmode.irq.vector = NMI_VECTOR;
2508 vmx->rmode.irq.rip = kvm_rip_read(vcpu);
2509 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2510 NMI_VECTOR | INTR_TYPE_SOFT_INTR |
2511 INTR_INFO_VALID_MASK);
2512 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
2513 kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
2514 return;
2515 }
2516 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2517 INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR);
2518 }
2519
2520 static int vmx_nmi_allowed(struct kvm_vcpu *vcpu)
2521 {
2522 if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked)
2523 return 0;
2524
2525 return !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
2526 (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS |
2527 GUEST_INTR_STATE_NMI));
2528 }
2529
2530 static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
2531 {
2532 return (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
2533 !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
2534 (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS));
2535 }
2536
2537 static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
2538 {
2539 int ret;
2540 struct kvm_userspace_memory_region tss_mem = {
2541 .slot = TSS_PRIVATE_MEMSLOT,
2542 .guest_phys_addr = addr,
2543 .memory_size = PAGE_SIZE * 3,
2544 .flags = 0,
2545 };
2546
2547 ret = kvm_set_memory_region(kvm, &tss_mem, 0);
2548 if (ret)
2549 return ret;
2550 kvm->arch.tss_addr = addr;
2551 return 0;
2552 }
2553
2554 static int handle_rmode_exception(struct kvm_vcpu *vcpu,
2555 int vec, u32 err_code)
2556 {
2557 /*
2558 * Instruction with address size override prefix opcode 0x67
2559 * Cause the #SS fault with 0 error code in VM86 mode.
2560 */
2561 if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
2562 if (emulate_instruction(vcpu, NULL, 0, 0, 0) == EMULATE_DONE)
2563 return 1;
2564 /*
2565 * Forward all other exceptions that are valid in real mode.
2566 * FIXME: Breaks guest debugging in real mode, needs to be fixed with
2567 * the required debugging infrastructure rework.
2568 */
2569 switch (vec) {
2570 case DB_VECTOR:
2571 if (vcpu->guest_debug &
2572 (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
2573 return 0;
2574 kvm_queue_exception(vcpu, vec);
2575 return 1;
2576 case BP_VECTOR:
2577 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
2578 return 0;
2579 /* fall through */
2580 case DE_VECTOR:
2581 case OF_VECTOR:
2582 case BR_VECTOR:
2583 case UD_VECTOR:
2584 case DF_VECTOR:
2585 case SS_VECTOR:
2586 case GP_VECTOR:
2587 case MF_VECTOR:
2588 kvm_queue_exception(vcpu, vec);
2589 return 1;
2590 }
2591 return 0;
2592 }
2593
2594 /*
2595 * Trigger machine check on the host. We assume all the MSRs are already set up
2596 * by the CPU and that we still run on the same CPU as the MCE occurred on.
2597 * We pass a fake environment to the machine check handler because we want
2598 * the guest to be always treated like user space, no matter what context
2599 * it used internally.
2600 */
2601 static void kvm_machine_check(void)
2602 {
2603 #if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64)
2604 struct pt_regs regs = {
2605 .cs = 3, /* Fake ring 3 no matter what the guest ran on */
2606 .flags = X86_EFLAGS_IF,
2607 };
2608
2609 do_machine_check(&regs, 0);
2610 #endif
2611 }
2612
2613 static int handle_machine_check(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2614 {
2615 /* already handled by vcpu_run */
2616 return 1;
2617 }
2618
2619 static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2620 {
2621 struct vcpu_vmx *vmx = to_vmx(vcpu);
2622 u32 intr_info, ex_no, error_code;
2623 unsigned long cr2, rip, dr6;
2624 u32 vect_info;
2625 enum emulation_result er;
2626
2627 vect_info = vmx->idt_vectoring_info;
2628 intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
2629
2630 if (is_machine_check(intr_info))
2631 return handle_machine_check(vcpu, kvm_run);
2632
2633 if ((vect_info & VECTORING_INFO_VALID_MASK) &&
2634 !is_page_fault(intr_info))
2635 printk(KERN_ERR "%s: unexpected, vectoring info 0x%x "
2636 "intr info 0x%x\n", __func__, vect_info, intr_info);
2637
2638 if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR)
2639 return 1; /* already handled by vmx_vcpu_run() */
2640
2641 if (is_no_device(intr_info)) {
2642 vmx_fpu_activate(vcpu);
2643 return 1;
2644 }
2645
2646 if (is_invalid_opcode(intr_info)) {
2647 er = emulate_instruction(vcpu, kvm_run, 0, 0, EMULTYPE_TRAP_UD);
2648 if (er != EMULATE_DONE)
2649 kvm_queue_exception(vcpu, UD_VECTOR);
2650 return 1;
2651 }
2652
2653 error_code = 0;
2654 rip = kvm_rip_read(vcpu);
2655 if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
2656 error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
2657 if (is_page_fault(intr_info)) {
2658 /* EPT won't cause page fault directly */
2659 if (enable_ept)
2660 BUG();
2661 cr2 = vmcs_readl(EXIT_QUALIFICATION);
2662 KVMTRACE_3D(PAGE_FAULT, vcpu, error_code, (u32)cr2,
2663 (u32)((u64)cr2 >> 32), handler);
2664 if (kvm_event_needs_reinjection(vcpu))
2665 kvm_mmu_unprotect_page_virt(vcpu, cr2);
2666 return kvm_mmu_page_fault(vcpu, cr2, error_code);
2667 }
2668
2669 if (vcpu->arch.rmode.vm86_active &&
2670 handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
2671 error_code)) {
2672 if (vcpu->arch.halt_request) {
2673 vcpu->arch.halt_request = 0;
2674 return kvm_emulate_halt(vcpu);
2675 }
2676 return 1;
2677 }
2678
2679 ex_no = intr_info & INTR_INFO_VECTOR_MASK;
2680 switch (ex_no) {
2681 case DB_VECTOR:
2682 dr6 = vmcs_readl(EXIT_QUALIFICATION);
2683 if (!(vcpu->guest_debug &
2684 (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
2685 vcpu->arch.dr6 = dr6 | DR6_FIXED_1;
2686 kvm_queue_exception(vcpu, DB_VECTOR);
2687 return 1;
2688 }
2689 kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1;
2690 kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7);
2691 /* fall through */
2692 case BP_VECTOR:
2693 kvm_run->exit_reason = KVM_EXIT_DEBUG;
2694 kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip;
2695 kvm_run->debug.arch.exception = ex_no;
2696 break;
2697 default:
2698 kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
2699 kvm_run->ex.exception = ex_no;
2700 kvm_run->ex.error_code = error_code;
2701 break;
2702 }
2703 return 0;
2704 }
2705
2706 static int handle_external_interrupt(struct kvm_vcpu *vcpu,
2707 struct kvm_run *kvm_run)
2708 {
2709 ++vcpu->stat.irq_exits;
2710 KVMTRACE_1D(INTR, vcpu, vmcs_read32(VM_EXIT_INTR_INFO), handler);
2711 return 1;
2712 }
2713
2714 static int handle_triple_fault(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2715 {
2716 kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
2717 return 0;
2718 }
2719
2720 static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2721 {
2722 unsigned long exit_qualification;
2723 int size, in, string;
2724 unsigned port;
2725
2726 ++vcpu->stat.io_exits;
2727 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2728 string = (exit_qualification & 16) != 0;
2729
2730 if (string) {
2731 if (emulate_instruction(vcpu,
2732 kvm_run, 0, 0, 0) == EMULATE_DO_MMIO)
2733 return 0;
2734 return 1;
2735 }
2736
2737 size = (exit_qualification & 7) + 1;
2738 in = (exit_qualification & 8) != 0;
2739 port = exit_qualification >> 16;
2740
2741 skip_emulated_instruction(vcpu);
2742 return kvm_emulate_pio(vcpu, kvm_run, in, size, port);
2743 }
2744
2745 static void
2746 vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
2747 {
2748 /*
2749 * Patch in the VMCALL instruction:
2750 */
2751 hypercall[0] = 0x0f;
2752 hypercall[1] = 0x01;
2753 hypercall[2] = 0xc1;
2754 }
2755
2756 static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2757 {
2758 unsigned long exit_qualification;
2759 int cr;
2760 int reg;
2761
2762 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2763 cr = exit_qualification & 15;
2764 reg = (exit_qualification >> 8) & 15;
2765 switch ((exit_qualification >> 4) & 3) {
2766 case 0: /* mov to cr */
2767 KVMTRACE_3D(CR_WRITE, vcpu, (u32)cr,
2768 (u32)kvm_register_read(vcpu, reg),
2769 (u32)((u64)kvm_register_read(vcpu, reg) >> 32),
2770 handler);
2771 switch (cr) {
2772 case 0:
2773 kvm_set_cr0(vcpu, kvm_register_read(vcpu, reg));
2774 skip_emulated_instruction(vcpu);
2775 return 1;
2776 case 3:
2777 kvm_set_cr3(vcpu, kvm_register_read(vcpu, reg));
2778 skip_emulated_instruction(vcpu);
2779 return 1;
2780 case 4:
2781 kvm_set_cr4(vcpu, kvm_register_read(vcpu, reg));
2782 skip_emulated_instruction(vcpu);
2783 return 1;
2784 case 8: {
2785 u8 cr8_prev = kvm_get_cr8(vcpu);
2786 u8 cr8 = kvm_register_read(vcpu, reg);
2787 kvm_set_cr8(vcpu, cr8);
2788 skip_emulated_instruction(vcpu);
2789 if (irqchip_in_kernel(vcpu->kvm))
2790 return 1;
2791 if (cr8_prev <= cr8)
2792 return 1;
2793 kvm_run->exit_reason = KVM_EXIT_SET_TPR;
2794 return 0;
2795 }
2796 };
2797 break;
2798 case 2: /* clts */
2799 vmx_fpu_deactivate(vcpu);
2800 vcpu->arch.cr0 &= ~X86_CR0_TS;
2801 vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
2802 vmx_fpu_activate(vcpu);
2803 KVMTRACE_0D(CLTS, vcpu, handler);
2804 skip_emulated_instruction(vcpu);
2805 return 1;
2806 case 1: /*mov from cr*/
2807 switch (cr) {
2808 case 3:
2809 kvm_register_write(vcpu, reg, vcpu->arch.cr3);
2810 KVMTRACE_3D(CR_READ, vcpu, (u32)cr,
2811 (u32)kvm_register_read(vcpu, reg),
2812 (u32)((u64)kvm_register_read(vcpu, reg) >> 32),
2813 handler);
2814 skip_emulated_instruction(vcpu);
2815 return 1;
2816 case 8:
2817 kvm_register_write(vcpu, reg, kvm_get_cr8(vcpu));
2818 KVMTRACE_2D(CR_READ, vcpu, (u32)cr,
2819 (u32)kvm_register_read(vcpu, reg), handler);
2820 skip_emulated_instruction(vcpu);
2821 return 1;
2822 }
2823 break;
2824 case 3: /* lmsw */
2825 kvm_lmsw(vcpu, (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f);
2826
2827 skip_emulated_instruction(vcpu);
2828 return 1;
2829 default:
2830 break;
2831 }
2832 kvm_run->exit_reason = 0;
2833 pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
2834 (int)(exit_qualification >> 4) & 3, cr);
2835 return 0;
2836 }
2837
2838 static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2839 {
2840 unsigned long exit_qualification;
2841 unsigned long val;
2842 int dr, reg;
2843
2844 dr = vmcs_readl(GUEST_DR7);
2845 if (dr & DR7_GD) {
2846 /*
2847 * As the vm-exit takes precedence over the debug trap, we
2848 * need to emulate the latter, either for the host or the
2849 * guest debugging itself.
2850 */
2851 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
2852 kvm_run->debug.arch.dr6 = vcpu->arch.dr6;
2853 kvm_run->debug.arch.dr7 = dr;
2854 kvm_run->debug.arch.pc =
2855 vmcs_readl(GUEST_CS_BASE) +
2856 vmcs_readl(GUEST_RIP);
2857 kvm_run->debug.arch.exception = DB_VECTOR;
2858 kvm_run->exit_reason = KVM_EXIT_DEBUG;
2859 return 0;
2860 } else {
2861 vcpu->arch.dr7 &= ~DR7_GD;
2862 vcpu->arch.dr6 |= DR6_BD;
2863 vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
2864 kvm_queue_exception(vcpu, DB_VECTOR);
2865 return 1;
2866 }
2867 }
2868
2869 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2870 dr = exit_qualification & DEBUG_REG_ACCESS_NUM;
2871 reg = DEBUG_REG_ACCESS_REG(exit_qualification);
2872 if (exit_qualification & TYPE_MOV_FROM_DR) {
2873 switch (dr) {
2874 case 0 ... 3:
2875 val = vcpu->arch.db[dr];
2876 break;
2877 case 6:
2878 val = vcpu->arch.dr6;
2879 break;
2880 case 7:
2881 val = vcpu->arch.dr7;
2882 break;
2883 default:
2884 val = 0;
2885 }
2886 kvm_register_write(vcpu, reg, val);
2887 KVMTRACE_2D(DR_READ, vcpu, (u32)dr, (u32)val, handler);
2888 } else {
2889 val = vcpu->arch.regs[reg];
2890 switch (dr) {
2891 case 0 ... 3:
2892 vcpu->arch.db[dr] = val;
2893 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
2894 vcpu->arch.eff_db[dr] = val;
2895 break;
2896 case 4 ... 5:
2897 if (vcpu->arch.cr4 & X86_CR4_DE)
2898 kvm_queue_exception(vcpu, UD_VECTOR);
2899 break;
2900 case 6:
2901 if (val & 0xffffffff00000000ULL) {
2902 kvm_queue_exception(vcpu, GP_VECTOR);
2903 break;
2904 }
2905 vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
2906 break;
2907 case 7:
2908 if (val & 0xffffffff00000000ULL) {
2909 kvm_queue_exception(vcpu, GP_VECTOR);
2910 break;
2911 }
2912 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
2913 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
2914 vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
2915 vcpu->arch.switch_db_regs =
2916 (val & DR7_BP_EN_MASK);
2917 }
2918 break;
2919 }
2920 KVMTRACE_2D(DR_WRITE, vcpu, (u32)dr, (u32)val, handler);
2921 }
2922 skip_emulated_instruction(vcpu);
2923 return 1;
2924 }
2925
2926 static int handle_cpuid(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2927 {
2928 kvm_emulate_cpuid(vcpu);
2929 return 1;
2930 }
2931
2932 static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2933 {
2934 u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
2935 u64 data;
2936
2937 if (vmx_get_msr(vcpu, ecx, &data)) {
2938 kvm_inject_gp(vcpu, 0);
2939 return 1;
2940 }
2941
2942 KVMTRACE_3D(MSR_READ, vcpu, ecx, (u32)data, (u32)(data >> 32),
2943 handler);
2944
2945 /* FIXME: handling of bits 32:63 of rax, rdx */
2946 vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
2947 vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
2948 skip_emulated_instruction(vcpu);
2949 return 1;
2950 }
2951
2952 static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2953 {
2954 u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
2955 u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
2956 | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
2957
2958 KVMTRACE_3D(MSR_WRITE, vcpu, ecx, (u32)data, (u32)(data >> 32),
2959 handler);
2960
2961 if (vmx_set_msr(vcpu, ecx, data) != 0) {
2962 kvm_inject_gp(vcpu, 0);
2963 return 1;
2964 }
2965
2966 skip_emulated_instruction(vcpu);
2967 return 1;
2968 }
2969
2970 static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu,
2971 struct kvm_run *kvm_run)
2972 {
2973 return 1;
2974 }
2975
2976 static int handle_interrupt_window(struct kvm_vcpu *vcpu,
2977 struct kvm_run *kvm_run)
2978 {
2979 u32 cpu_based_vm_exec_control;
2980
2981 /* clear pending irq */
2982 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
2983 cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
2984 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
2985
2986 KVMTRACE_0D(PEND_INTR, vcpu, handler);
2987 ++vcpu->stat.irq_window_exits;
2988
2989 /*
2990 * If the user space waits to inject interrupts, exit as soon as
2991 * possible
2992 */
2993 if (!irqchip_in_kernel(vcpu->kvm) &&
2994 kvm_run->request_interrupt_window &&
2995 !kvm_cpu_has_interrupt(vcpu)) {
2996 kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
2997 return 0;
2998 }
2999 return 1;
3000 }
3001
3002 static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3003 {
3004 skip_emulated_instruction(vcpu);
3005 return kvm_emulate_halt(vcpu);
3006 }
3007
3008 static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3009 {
3010 skip_emulated_instruction(vcpu);
3011 kvm_emulate_hypercall(vcpu);
3012 return 1;
3013 }
3014
3015 static int handle_vmx_insn(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3016 {
3017 kvm_queue_exception(vcpu, UD_VECTOR);
3018 return 1;
3019 }
3020
3021 static int handle_invlpg(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3022 {
3023 unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3024
3025 kvm_mmu_invlpg(vcpu, exit_qualification);
3026 skip_emulated_instruction(vcpu);
3027 return 1;
3028 }
3029
3030 static int handle_wbinvd(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3031 {
3032 skip_emulated_instruction(vcpu);
3033 /* TODO: Add support for VT-d/pass-through device */
3034 return 1;
3035 }
3036
3037 static int handle_apic_access(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3038 {
3039 unsigned long exit_qualification;
3040 enum emulation_result er;
3041 unsigned long offset;
3042
3043 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3044 offset = exit_qualification & 0xffful;
3045
3046 er = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
3047
3048 if (er != EMULATE_DONE) {
3049 printk(KERN_ERR
3050 "Fail to handle apic access vmexit! Offset is 0x%lx\n",
3051 offset);
3052 return -ENOTSUPP;
3053 }
3054 return 1;
3055 }
3056
3057 static int handle_task_switch(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3058 {
3059 struct vcpu_vmx *vmx = to_vmx(vcpu);
3060 unsigned long exit_qualification;
3061 u16 tss_selector;
3062 int reason, type, idt_v;
3063
3064 idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK);
3065 type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK);
3066
3067 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3068
3069 reason = (u32)exit_qualification >> 30;
3070 if (reason == TASK_SWITCH_GATE && idt_v) {
3071 switch (type) {
3072 case INTR_TYPE_NMI_INTR:
3073 vcpu->arch.nmi_injected = false;
3074 if (cpu_has_virtual_nmis())
3075 vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
3076 GUEST_INTR_STATE_NMI);
3077 break;
3078 case INTR_TYPE_EXT_INTR:
3079 case INTR_TYPE_SOFT_INTR:
3080 kvm_clear_interrupt_queue(vcpu);
3081 break;
3082 case INTR_TYPE_HARD_EXCEPTION:
3083 case INTR_TYPE_SOFT_EXCEPTION:
3084 kvm_clear_exception_queue(vcpu);
3085 break;
3086 default:
3087 break;
3088 }
3089 }
3090 tss_selector = exit_qualification;
3091
3092 if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION &&
3093 type != INTR_TYPE_EXT_INTR &&
3094 type != INTR_TYPE_NMI_INTR))
3095 skip_emulated_instruction(vcpu);
3096
3097 if (!kvm_task_switch(vcpu, tss_selector, reason))
3098 return 0;
3099
3100 /* clear all local breakpoint enable flags */
3101 vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55);
3102
3103 /*
3104 * TODO: What about debug traps on tss switch?
3105 * Are we supposed to inject them and update dr6?
3106 */
3107
3108 return 1;
3109 }
3110
3111 static int handle_ept_violation(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3112 {
3113 unsigned long exit_qualification;
3114 gpa_t gpa;
3115 int gla_validity;
3116
3117 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3118
3119 if (exit_qualification & (1 << 6)) {
3120 printk(KERN_ERR "EPT: GPA exceeds GAW!\n");
3121 return -ENOTSUPP;
3122 }
3123
3124 gla_validity = (exit_qualification >> 7) & 0x3;
3125 if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) {
3126 printk(KERN_ERR "EPT: Handling EPT violation failed!\n");
3127 printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n",
3128 (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS),
3129 vmcs_readl(GUEST_LINEAR_ADDRESS));
3130 printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
3131 (long unsigned int)exit_qualification);
3132 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
3133 kvm_run->hw.hardware_exit_reason = 0;
3134 return -ENOTSUPP;
3135 }
3136
3137 gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
3138 return kvm_mmu_page_fault(vcpu, gpa & PAGE_MASK, 0);
3139 }
3140
3141 static int handle_nmi_window(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3142 {
3143 u32 cpu_based_vm_exec_control;
3144
3145 /* clear pending NMI */
3146 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
3147 cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
3148 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
3149 ++vcpu->stat.nmi_window_exits;
3150
3151 return 1;
3152 }
3153
3154 static void handle_invalid_guest_state(struct kvm_vcpu *vcpu,
3155 struct kvm_run *kvm_run)
3156 {
3157 struct vcpu_vmx *vmx = to_vmx(vcpu);
3158 enum emulation_result err = EMULATE_DONE;
3159
3160 preempt_enable();
3161 local_irq_enable();
3162
3163 while (!guest_state_valid(vcpu)) {
3164 err = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
3165
3166 if (err == EMULATE_DO_MMIO)
3167 break;
3168
3169 if (err != EMULATE_DONE) {
3170 kvm_report_emulation_failure(vcpu, "emulation failure");
3171 return;
3172 }
3173
3174 if (signal_pending(current))
3175 break;
3176 if (need_resched())
3177 schedule();
3178 }
3179
3180 local_irq_disable();
3181 preempt_disable();
3182
3183 vmx->invalid_state_emulation_result = err;
3184 }
3185
3186 /*
3187 * The exit handlers return 1 if the exit was handled fully and guest execution
3188 * may resume. Otherwise they set the kvm_run parameter to indicate what needs
3189 * to be done to userspace and return 0.
3190 */
3191 static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu,
3192 struct kvm_run *kvm_run) = {
3193 [EXIT_REASON_EXCEPTION_NMI] = handle_exception,
3194 [EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt,
3195 [EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault,
3196 [EXIT_REASON_NMI_WINDOW] = handle_nmi_window,
3197 [EXIT_REASON_IO_INSTRUCTION] = handle_io,
3198 [EXIT_REASON_CR_ACCESS] = handle_cr,
3199 [EXIT_REASON_DR_ACCESS] = handle_dr,
3200 [EXIT_REASON_CPUID] = handle_cpuid,
3201 [EXIT_REASON_MSR_READ] = handle_rdmsr,
3202 [EXIT_REASON_MSR_WRITE] = handle_wrmsr,
3203 [EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window,
3204 [EXIT_REASON_HLT] = handle_halt,
3205 [EXIT_REASON_INVLPG] = handle_invlpg,
3206 [EXIT_REASON_VMCALL] = handle_vmcall,
3207 [EXIT_REASON_VMCLEAR] = handle_vmx_insn,
3208 [EXIT_REASON_VMLAUNCH] = handle_vmx_insn,
3209 [EXIT_REASON_VMPTRLD] = handle_vmx_insn,
3210 [EXIT_REASON_VMPTRST] = handle_vmx_insn,
3211 [EXIT_REASON_VMREAD] = handle_vmx_insn,
3212 [EXIT_REASON_VMRESUME] = handle_vmx_insn,
3213 [EXIT_REASON_VMWRITE] = handle_vmx_insn,
3214 [EXIT_REASON_VMOFF] = handle_vmx_insn,
3215 [EXIT_REASON_VMON] = handle_vmx_insn,
3216 [EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold,
3217 [EXIT_REASON_APIC_ACCESS] = handle_apic_access,
3218 [EXIT_REASON_WBINVD] = handle_wbinvd,
3219 [EXIT_REASON_TASK_SWITCH] = handle_task_switch,
3220 [EXIT_REASON_EPT_VIOLATION] = handle_ept_violation,
3221 [EXIT_REASON_MCE_DURING_VMENTRY] = handle_machine_check,
3222 };
3223
3224 static const int kvm_vmx_max_exit_handlers =
3225 ARRAY_SIZE(kvm_vmx_exit_handlers);
3226
3227 /*
3228 * The guest has exited. See if we can fix it or if we need userspace
3229 * assistance.
3230 */
3231 static int vmx_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
3232 {
3233 struct vcpu_vmx *vmx = to_vmx(vcpu);
3234 u32 exit_reason = vmx->exit_reason;
3235 u32 vectoring_info = vmx->idt_vectoring_info;
3236
3237 KVMTRACE_3D(VMEXIT, vcpu, exit_reason, (u32)kvm_rip_read(vcpu),
3238 (u32)((u64)kvm_rip_read(vcpu) >> 32), entryexit);
3239
3240 /* If we need to emulate an MMIO from handle_invalid_guest_state
3241 * we just return 0 */
3242 if (vmx->emulation_required && emulate_invalid_guest_state) {
3243 if (guest_state_valid(vcpu))
3244 vmx->emulation_required = 0;
3245 return vmx->invalid_state_emulation_result != EMULATE_DO_MMIO;
3246 }
3247
3248 /* Access CR3 don't cause VMExit in paging mode, so we need
3249 * to sync with guest real CR3. */
3250 if (enable_ept && is_paging(vcpu)) {
3251 vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
3252 ept_load_pdptrs(vcpu);
3253 }
3254
3255 if (unlikely(vmx->fail)) {
3256 kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
3257 kvm_run->fail_entry.hardware_entry_failure_reason
3258 = vmcs_read32(VM_INSTRUCTION_ERROR);
3259 return 0;
3260 }
3261
3262 if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
3263 (exit_reason != EXIT_REASON_EXCEPTION_NMI &&
3264 exit_reason != EXIT_REASON_EPT_VIOLATION &&
3265 exit_reason != EXIT_REASON_TASK_SWITCH))
3266 printk(KERN_WARNING "%s: unexpected, valid vectoring info "
3267 "(0x%x) and exit reason is 0x%x\n",
3268 __func__, vectoring_info, exit_reason);
3269
3270 if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) {
3271 if (vmx_interrupt_allowed(vcpu)) {
3272 vmx->soft_vnmi_blocked = 0;
3273 } else if (vmx->vnmi_blocked_time > 1000000000LL &&
3274 vcpu->arch.nmi_pending) {
3275 /*
3276 * This CPU don't support us in finding the end of an
3277 * NMI-blocked window if the guest runs with IRQs
3278 * disabled. So we pull the trigger after 1 s of
3279 * futile waiting, but inform the user about this.
3280 */
3281 printk(KERN_WARNING "%s: Breaking out of NMI-blocked "
3282 "state on VCPU %d after 1 s timeout\n",
3283 __func__, vcpu->vcpu_id);
3284 vmx->soft_vnmi_blocked = 0;
3285 }
3286 }
3287
3288 if (exit_reason < kvm_vmx_max_exit_handlers
3289 && kvm_vmx_exit_handlers[exit_reason])
3290 return kvm_vmx_exit_handlers[exit_reason](vcpu, kvm_run);
3291 else {
3292 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
3293 kvm_run->hw.hardware_exit_reason = exit_reason;
3294 }
3295 return 0;
3296 }
3297
3298 static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
3299 {
3300 if (irr == -1 || tpr < irr) {
3301 vmcs_write32(TPR_THRESHOLD, 0);
3302 return;
3303 }
3304
3305 vmcs_write32(TPR_THRESHOLD, irr);
3306 }
3307
3308 static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
3309 {
3310 u32 exit_intr_info;
3311 u32 idt_vectoring_info = vmx->idt_vectoring_info;
3312 bool unblock_nmi;
3313 u8 vector;
3314 int type;
3315 bool idtv_info_valid;
3316
3317 exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
3318
3319 vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
3320
3321 /* Handle machine checks before interrupts are enabled */
3322 if ((vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY)
3323 || (vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI
3324 && is_machine_check(exit_intr_info)))
3325 kvm_machine_check();
3326
3327 /* We need to handle NMIs before interrupts are enabled */
3328 if ((exit_intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR &&
3329 (exit_intr_info & INTR_INFO_VALID_MASK)) {
3330 KVMTRACE_0D(NMI, &vmx->vcpu, handler);
3331 asm("int $2");
3332 }
3333
3334 idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;
3335
3336 if (cpu_has_virtual_nmis()) {
3337 unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
3338 vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
3339 /*
3340 * SDM 3: 27.7.1.2 (September 2008)
3341 * Re-set bit "block by NMI" before VM entry if vmexit caused by
3342 * a guest IRET fault.
3343 * SDM 3: 23.2.2 (September 2008)
3344 * Bit 12 is undefined in any of the following cases:
3345 * If the VM exit sets the valid bit in the IDT-vectoring
3346 * information field.
3347 * If the VM exit is due to a double fault.
3348 */
3349 if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi &&
3350 vector != DF_VECTOR && !idtv_info_valid)
3351 vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
3352 GUEST_INTR_STATE_NMI);
3353 } else if (unlikely(vmx->soft_vnmi_blocked))
3354 vmx->vnmi_blocked_time +=
3355 ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time));
3356
3357 vmx->vcpu.arch.nmi_injected = false;
3358 kvm_clear_exception_queue(&vmx->vcpu);
3359 kvm_clear_interrupt_queue(&vmx->vcpu);
3360
3361 if (!idtv_info_valid)
3362 return;
3363
3364 vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
3365 type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;
3366
3367 switch (type) {
3368 case INTR_TYPE_NMI_INTR:
3369 vmx->vcpu.arch.nmi_injected = true;
3370 /*
3371 * SDM 3: 27.7.1.2 (September 2008)
3372 * Clear bit "block by NMI" before VM entry if a NMI
3373 * delivery faulted.
3374 */
3375 vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
3376 GUEST_INTR_STATE_NMI);
3377 break;
3378 case INTR_TYPE_SOFT_EXCEPTION:
3379 vmx->vcpu.arch.event_exit_inst_len =
3380 vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
3381 /* fall through */
3382 case INTR_TYPE_HARD_EXCEPTION:
3383 if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) {
3384 u32 err = vmcs_read32(IDT_VECTORING_ERROR_CODE);
3385 kvm_queue_exception_e(&vmx->vcpu, vector, err);
3386 } else
3387 kvm_queue_exception(&vmx->vcpu, vector);
3388 break;
3389 case INTR_TYPE_SOFT_INTR:
3390 vmx->vcpu.arch.event_exit_inst_len =
3391 vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
3392 /* fall through */
3393 case INTR_TYPE_EXT_INTR:
3394 kvm_queue_interrupt(&vmx->vcpu, vector,
3395 type == INTR_TYPE_SOFT_INTR);
3396 break;
3397 default:
3398 break;
3399 }
3400 }
3401
3402 /*
3403 * Failure to inject an interrupt should give us the information
3404 * in IDT_VECTORING_INFO_FIELD. However, if the failure occurs
3405 * when fetching the interrupt redirection bitmap in the real-mode
3406 * tss, this doesn't happen. So we do it ourselves.
3407 */
3408 static void fixup_rmode_irq(struct vcpu_vmx *vmx)
3409 {
3410 vmx->rmode.irq.pending = 0;
3411 if (kvm_rip_read(&vmx->vcpu) + 1 != vmx->rmode.irq.rip)
3412 return;
3413 kvm_rip_write(&vmx->vcpu, vmx->rmode.irq.rip);
3414 if (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) {
3415 vmx->idt_vectoring_info &= ~VECTORING_INFO_TYPE_MASK;
3416 vmx->idt_vectoring_info |= INTR_TYPE_EXT_INTR;
3417 return;
3418 }
3419 vmx->idt_vectoring_info =
3420 VECTORING_INFO_VALID_MASK
3421 | INTR_TYPE_EXT_INTR
3422 | vmx->rmode.irq.vector;
3423 }
3424
3425 #ifdef CONFIG_X86_64
3426 #define R "r"
3427 #define Q "q"
3428 #else
3429 #define R "e"
3430 #define Q "l"
3431 #endif
3432
3433 static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3434 {
3435 struct vcpu_vmx *vmx = to_vmx(vcpu);
3436
3437 /* Record the guest's net vcpu time for enforced NMI injections. */
3438 if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
3439 vmx->entry_time = ktime_get();
3440
3441 /* Handle invalid guest state instead of entering VMX */
3442 if (vmx->emulation_required && emulate_invalid_guest_state) {
3443 handle_invalid_guest_state(vcpu, kvm_run);
3444 return;
3445 }
3446
3447 if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
3448 vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
3449 if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
3450 vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
3451
3452 /*
3453 * Loading guest fpu may have cleared host cr0.ts
3454 */
3455 vmcs_writel(HOST_CR0, read_cr0());
3456
3457 set_debugreg(vcpu->arch.dr6, 6);
3458
3459 asm(
3460 /* Store host registers */
3461 "push %%"R"dx; push %%"R"bp;"
3462 "push %%"R"cx \n\t"
3463 "cmp %%"R"sp, %c[host_rsp](%0) \n\t"
3464 "je 1f \n\t"
3465 "mov %%"R"sp, %c[host_rsp](%0) \n\t"
3466 __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t"
3467 "1: \n\t"
3468 /* Check if vmlaunch of vmresume is needed */
3469 "cmpl $0, %c[launched](%0) \n\t"
3470 /* Load guest registers. Don't clobber flags. */
3471 "mov %c[cr2](%0), %%"R"ax \n\t"
3472 "mov %%"R"ax, %%cr2 \n\t"
3473 "mov %c[rax](%0), %%"R"ax \n\t"
3474 "mov %c[rbx](%0), %%"R"bx \n\t"
3475 "mov %c[rdx](%0), %%"R"dx \n\t"
3476 "mov %c[rsi](%0), %%"R"si \n\t"
3477 "mov %c[rdi](%0), %%"R"di \n\t"
3478 "mov %c[rbp](%0), %%"R"bp \n\t"
3479 #ifdef CONFIG_X86_64
3480 "mov %c[r8](%0), %%r8 \n\t"
3481 "mov %c[r9](%0), %%r9 \n\t"
3482 "mov %c[r10](%0), %%r10 \n\t"
3483 "mov %c[r11](%0), %%r11 \n\t"
3484 "mov %c[r12](%0), %%r12 \n\t"
3485 "mov %c[r13](%0), %%r13 \n\t"
3486 "mov %c[r14](%0), %%r14 \n\t"
3487 "mov %c[r15](%0), %%r15 \n\t"
3488 #endif
3489 "mov %c[rcx](%0), %%"R"cx \n\t" /* kills %0 (ecx) */
3490
3491 /* Enter guest mode */
3492 "jne .Llaunched \n\t"
3493 __ex(ASM_VMX_VMLAUNCH) "\n\t"
3494 "jmp .Lkvm_vmx_return \n\t"
3495 ".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t"
3496 ".Lkvm_vmx_return: "
3497 /* Save guest registers, load host registers, keep flags */
3498 "xchg %0, (%%"R"sp) \n\t"
3499 "mov %%"R"ax, %c[rax](%0) \n\t"
3500 "mov %%"R"bx, %c[rbx](%0) \n\t"
3501 "push"Q" (%%"R"sp); pop"Q" %c[rcx](%0) \n\t"
3502 "mov %%"R"dx, %c[rdx](%0) \n\t"
3503 "mov %%"R"si, %c[rsi](%0) \n\t"
3504 "mov %%"R"di, %c[rdi](%0) \n\t"
3505 "mov %%"R"bp, %c[rbp](%0) \n\t"
3506 #ifdef CONFIG_X86_64
3507 "mov %%r8, %c[r8](%0) \n\t"
3508 "mov %%r9, %c[r9](%0) \n\t"
3509 "mov %%r10, %c[r10](%0) \n\t"
3510 "mov %%r11, %c[r11](%0) \n\t"
3511 "mov %%r12, %c[r12](%0) \n\t"
3512 "mov %%r13, %c[r13](%0) \n\t"
3513 "mov %%r14, %c[r14](%0) \n\t"
3514 "mov %%r15, %c[r15](%0) \n\t"
3515 #endif
3516 "mov %%cr2, %%"R"ax \n\t"
3517 "mov %%"R"ax, %c[cr2](%0) \n\t"
3518
3519 "pop %%"R"bp; pop %%"R"bp; pop %%"R"dx \n\t"
3520 "setbe %c[fail](%0) \n\t"
3521 : : "c"(vmx), "d"((unsigned long)HOST_RSP),
3522 [launched]"i"(offsetof(struct vcpu_vmx, launched)),
3523 [fail]"i"(offsetof(struct vcpu_vmx, fail)),
3524 [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)),
3525 [rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])),
3526 [rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])),
3527 [rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])),
3528 [rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])),
3529 [rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])),
3530 [rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])),
3531 [rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])),
3532 #ifdef CONFIG_X86_64
3533 [r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])),
3534 [r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])),
3535 [r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])),
3536 [r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])),
3537 [r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])),
3538 [r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])),
3539 [r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])),
3540 [r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])),
3541 #endif
3542 [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2))
3543 : "cc", "memory"
3544 , R"bx", R"di", R"si"
3545 #ifdef CONFIG_X86_64
3546 , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
3547 #endif
3548 );
3549
3550 vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
3551 vcpu->arch.regs_dirty = 0;
3552
3553 get_debugreg(vcpu->arch.dr6, 6);
3554
3555 vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
3556 if (vmx->rmode.irq.pending)
3557 fixup_rmode_irq(vmx);
3558
3559 asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
3560 vmx->launched = 1;
3561
3562 vmx_complete_interrupts(vmx);
3563 }
3564
3565 #undef R
3566 #undef Q
3567
3568 static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
3569 {
3570 struct vcpu_vmx *vmx = to_vmx(vcpu);
3571
3572 if (vmx->vmcs) {
3573 vcpu_clear(vmx);
3574 free_vmcs(vmx->vmcs);
3575 vmx->vmcs = NULL;
3576 }
3577 }
3578
3579 static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
3580 {
3581 struct vcpu_vmx *vmx = to_vmx(vcpu);
3582
3583 spin_lock(&vmx_vpid_lock);
3584 if (vmx->vpid != 0)
3585 __clear_bit(vmx->vpid, vmx_vpid_bitmap);
3586 spin_unlock(&vmx_vpid_lock);
3587 vmx_free_vmcs(vcpu);
3588 kfree(vmx->host_msrs);
3589 kfree(vmx->guest_msrs);
3590 kvm_vcpu_uninit(vcpu);
3591 kmem_cache_free(kvm_vcpu_cache, vmx);
3592 }
3593
3594 static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
3595 {
3596 int err;
3597 struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
3598 int cpu;
3599
3600 if (!vmx)
3601 return ERR_PTR(-ENOMEM);
3602
3603 allocate_vpid(vmx);
3604
3605 err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
3606 if (err)
3607 goto free_vcpu;
3608
3609 vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
3610 if (!vmx->guest_msrs) {
3611 err = -ENOMEM;
3612 goto uninit_vcpu;
3613 }
3614
3615 vmx->host_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
3616 if (!vmx->host_msrs)
3617 goto free_guest_msrs;
3618
3619 vmx->vmcs = alloc_vmcs();
3620 if (!vmx->vmcs)
3621 goto free_msrs;
3622
3623 vmcs_clear(vmx->vmcs);
3624
3625 cpu = get_cpu();
3626 vmx_vcpu_load(&vmx->vcpu, cpu);
3627 err = vmx_vcpu_setup(vmx);
3628 vmx_vcpu_put(&vmx->vcpu);
3629 put_cpu();
3630 if (err)
3631 goto free_vmcs;
3632 if (vm_need_virtualize_apic_accesses(kvm))
3633 if (alloc_apic_access_page(kvm) != 0)
3634 goto free_vmcs;
3635
3636 if (enable_ept)
3637 if (alloc_identity_pagetable(kvm) != 0)
3638 goto free_vmcs;
3639
3640 return &vmx->vcpu;
3641
3642 free_vmcs:
3643 free_vmcs(vmx->vmcs);
3644 free_msrs:
3645 kfree(vmx->host_msrs);
3646 free_guest_msrs:
3647 kfree(vmx->guest_msrs);
3648 uninit_vcpu:
3649 kvm_vcpu_uninit(&vmx->vcpu);
3650 free_vcpu:
3651 kmem_cache_free(kvm_vcpu_cache, vmx);
3652 return ERR_PTR(err);
3653 }
3654
3655 static void __init vmx_check_processor_compat(void *rtn)
3656 {
3657 struct vmcs_config vmcs_conf;
3658
3659 *(int *)rtn = 0;
3660 if (setup_vmcs_config(&vmcs_conf) < 0)
3661 *(int *)rtn = -EIO;
3662 if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) {
3663 printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n",
3664 smp_processor_id());
3665 *(int *)rtn = -EIO;
3666 }
3667 }
3668
3669 static int get_ept_level(void)
3670 {
3671 return VMX_EPT_DEFAULT_GAW + 1;
3672 }
3673
3674 static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
3675 {
3676 u64 ret;
3677
3678 /* For VT-d and EPT combination
3679 * 1. MMIO: always map as UC
3680 * 2. EPT with VT-d:
3681 * a. VT-d without snooping control feature: can't guarantee the
3682 * result, try to trust guest.
3683 * b. VT-d with snooping control feature: snooping control feature of
3684 * VT-d engine can guarantee the cache correctness. Just set it
3685 * to WB to keep consistent with host. So the same as item 3.
3686 * 3. EPT without VT-d: always map as WB and set IGMT=1 to keep
3687 * consistent with host MTRR
3688 */
3689 if (is_mmio)
3690 ret = MTRR_TYPE_UNCACHABLE << VMX_EPT_MT_EPTE_SHIFT;
3691 else if (vcpu->kvm->arch.iommu_domain &&
3692 !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY))
3693 ret = kvm_get_guest_memory_type(vcpu, gfn) <<
3694 VMX_EPT_MT_EPTE_SHIFT;
3695 else
3696 ret = (MTRR_TYPE_WRBACK << VMX_EPT_MT_EPTE_SHIFT)
3697 | VMX_EPT_IGMT_BIT;
3698
3699 return ret;
3700 }
3701
3702 static struct kvm_x86_ops vmx_x86_ops = {
3703 .cpu_has_kvm_support = cpu_has_kvm_support,
3704 .disabled_by_bios = vmx_disabled_by_bios,
3705 .hardware_setup = hardware_setup,
3706 .hardware_unsetup = hardware_unsetup,
3707 .check_processor_compatibility = vmx_check_processor_compat,
3708 .hardware_enable = hardware_enable,
3709 .hardware_disable = hardware_disable,
3710 .cpu_has_accelerated_tpr = report_flexpriority,
3711
3712 .vcpu_create = vmx_create_vcpu,
3713 .vcpu_free = vmx_free_vcpu,
3714 .vcpu_reset = vmx_vcpu_reset,
3715
3716 .prepare_guest_switch = vmx_save_host_state,
3717 .vcpu_load = vmx_vcpu_load,
3718 .vcpu_put = vmx_vcpu_put,
3719
3720 .set_guest_debug = set_guest_debug,
3721 .get_msr = vmx_get_msr,
3722 .set_msr = vmx_set_msr,
3723 .get_segment_base = vmx_get_segment_base,
3724 .get_segment = vmx_get_segment,
3725 .set_segment = vmx_set_segment,
3726 .get_cpl = vmx_get_cpl,
3727 .get_cs_db_l_bits = vmx_get_cs_db_l_bits,
3728 .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
3729 .set_cr0 = vmx_set_cr0,
3730 .set_cr3 = vmx_set_cr3,
3731 .set_cr4 = vmx_set_cr4,
3732 .set_efer = vmx_set_efer,
3733 .get_idt = vmx_get_idt,
3734 .set_idt = vmx_set_idt,
3735 .get_gdt = vmx_get_gdt,
3736 .set_gdt = vmx_set_gdt,
3737 .cache_reg = vmx_cache_reg,
3738 .get_rflags = vmx_get_rflags,
3739 .set_rflags = vmx_set_rflags,
3740
3741 .tlb_flush = vmx_flush_tlb,
3742
3743 .run = vmx_vcpu_run,
3744 .handle_exit = vmx_handle_exit,
3745 .skip_emulated_instruction = skip_emulated_instruction,
3746 .set_interrupt_shadow = vmx_set_interrupt_shadow,
3747 .get_interrupt_shadow = vmx_get_interrupt_shadow,
3748 .patch_hypercall = vmx_patch_hypercall,
3749 .set_irq = vmx_inject_irq,
3750 .set_nmi = vmx_inject_nmi,
3751 .queue_exception = vmx_queue_exception,
3752 .interrupt_allowed = vmx_interrupt_allowed,
3753 .nmi_allowed = vmx_nmi_allowed,
3754 .enable_nmi_window = enable_nmi_window,
3755 .enable_irq_window = enable_irq_window,
3756 .update_cr8_intercept = update_cr8_intercept,
3757
3758 .set_tss_addr = vmx_set_tss_addr,
3759 .get_tdp_level = get_ept_level,
3760 .get_mt_mask = vmx_get_mt_mask,
3761 };
3762
3763 static int __init vmx_init(void)
3764 {
3765 int r;
3766
3767 vmx_io_bitmap_a = (unsigned long *)__get_free_page(GFP_KERNEL);
3768 if (!vmx_io_bitmap_a)
3769 return -ENOMEM;
3770
3771 vmx_io_bitmap_b = (unsigned long *)__get_free_page(GFP_KERNEL);
3772 if (!vmx_io_bitmap_b) {
3773 r = -ENOMEM;
3774 goto out;
3775 }
3776
3777 vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL);
3778 if (!vmx_msr_bitmap_legacy) {
3779 r = -ENOMEM;
3780 goto out1;
3781 }
3782
3783 vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL);
3784 if (!vmx_msr_bitmap_longmode) {
3785 r = -ENOMEM;
3786 goto out2;
3787 }
3788
3789 /*
3790 * Allow direct access to the PC debug port (it is often used for I/O
3791 * delays, but the vmexits simply slow things down).
3792 */
3793 memset(vmx_io_bitmap_a, 0xff, PAGE_SIZE);
3794 clear_bit(0x80, vmx_io_bitmap_a);
3795
3796 memset(vmx_io_bitmap_b, 0xff, PAGE_SIZE);
3797
3798 memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE);
3799 memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE);
3800
3801 set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */
3802
3803 r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), THIS_MODULE);
3804 if (r)
3805 goto out3;
3806
3807 vmx_disable_intercept_for_msr(MSR_FS_BASE, false);
3808 vmx_disable_intercept_for_msr(MSR_GS_BASE, false);
3809 vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true);
3810 vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false);
3811 vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false);
3812 vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
3813
3814 if (enable_ept) {
3815 bypass_guest_pf = 0;
3816 kvm_mmu_set_base_ptes(VMX_EPT_READABLE_MASK |
3817 VMX_EPT_WRITABLE_MASK);
3818 kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull,
3819 VMX_EPT_EXECUTABLE_MASK);
3820 kvm_enable_tdp();
3821 } else
3822 kvm_disable_tdp();
3823
3824 if (bypass_guest_pf)
3825 kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull);
3826
3827 ept_sync_global();
3828
3829 return 0;
3830
3831 out3:
3832 free_page((unsigned long)vmx_msr_bitmap_longmode);
3833 out2:
3834 free_page((unsigned long)vmx_msr_bitmap_legacy);
3835 out1:
3836 free_page((unsigned long)vmx_io_bitmap_b);
3837 out:
3838 free_page((unsigned long)vmx_io_bitmap_a);
3839 return r;
3840 }
3841
3842 static void __exit vmx_exit(void)
3843 {
3844 free_page((unsigned long)vmx_msr_bitmap_legacy);
3845 free_page((unsigned long)vmx_msr_bitmap_longmode);
3846 free_page((unsigned long)vmx_io_bitmap_b);
3847 free_page((unsigned long)vmx_io_bitmap_a);
3848
3849 kvm_exit();
3850 }
3851
3852 module_init(vmx_init)
3853 module_exit(vmx_exit)
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