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First Support on Ginger and OMAP TI
[linux-ginger.git] / arch / x86 / kvm / vmx.c
blobed53b42caba119bb7b488efdf79170b44ba922e4
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 <linux/ftrace_event.h>
29 #include "kvm_cache_regs.h"
30 #include "x86.h"
31
32 #include <asm/io.h>
33 #include <asm/desc.h>
34 #include <asm/vmx.h>
35 #include <asm/virtext.h>
36 #include <asm/mce.h>
37
38 #include "trace.h"
39
40 #define __ex(x) __kvm_handle_fault_on_reboot(x)
41
42 MODULE_AUTHOR("Qumranet");
43 MODULE_LICENSE("GPL");
44
45 static int __read_mostly bypass_guest_pf = 1;
46 module_param(bypass_guest_pf, bool, S_IRUGO);
47
48 static int __read_mostly enable_vpid = 1;
49 module_param_named(vpid, enable_vpid, bool, 0444);
50
51 static int __read_mostly flexpriority_enabled = 1;
52 module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO);
53
54 static int __read_mostly enable_ept = 1;
55 module_param_named(ept, enable_ept, bool, S_IRUGO);
56
57 static int __read_mostly enable_unrestricted_guest = 1;
58 module_param_named(unrestricted_guest,
59 enable_unrestricted_guest, bool, S_IRUGO);
60
61 static int __read_mostly emulate_invalid_guest_state = 0;
62 module_param(emulate_invalid_guest_state, bool, S_IRUGO);
63
64 struct vmcs {
65 u32 revision_id;
66 u32 abort;
67 char data[0];
68 };
69
70 struct vcpu_vmx {
71 struct kvm_vcpu vcpu;
72 struct list_head local_vcpus_link;
73 unsigned long host_rsp;
74 int launched;
75 u8 fail;
76 u32 idt_vectoring_info;
77 struct kvm_msr_entry *guest_msrs;
78 struct kvm_msr_entry *host_msrs;
79 int nmsrs;
80 int save_nmsrs;
81 int msr_offset_efer;
82 #ifdef CONFIG_X86_64
83 int msr_offset_kernel_gs_base;
84 #endif
85 struct vmcs *vmcs;
86 struct {
87 int loaded;
88 u16 fs_sel, gs_sel, ldt_sel;
89 int gs_ldt_reload_needed;
90 int fs_reload_needed;
91 int guest_efer_loaded;
92 } host_state;
93 struct {
94 int vm86_active;
95 u8 save_iopl;
96 struct kvm_save_segment {
97 u16 selector;
98 unsigned long base;
99 u32 limit;
100 u32 ar;
101 } tr, es, ds, fs, gs;
102 struct {
103 bool pending;
104 u8 vector;
105 unsigned rip;
106 } irq;
107 } rmode;
108 int vpid;
109 bool emulation_required;
110 enum emulation_result invalid_state_emulation_result;
111
112 /* Support for vnmi-less CPUs */
113 int soft_vnmi_blocked;
114 ktime_t entry_time;
115 s64 vnmi_blocked_time;
116 u32 exit_reason;
117 };
118
119 static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
120 {
121 return container_of(vcpu, struct vcpu_vmx, vcpu);
122 }
123
124 static int init_rmode(struct kvm *kvm);
125 static u64 construct_eptp(unsigned long root_hpa);
126
127 static DEFINE_PER_CPU(struct vmcs *, vmxarea);
128 static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
129 static DEFINE_PER_CPU(struct list_head, vcpus_on_cpu);
130
131 static unsigned long *vmx_io_bitmap_a;
132 static unsigned long *vmx_io_bitmap_b;
133 static unsigned long *vmx_msr_bitmap_legacy;
134 static unsigned long *vmx_msr_bitmap_longmode;
135
136 static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS);
137 static DEFINE_SPINLOCK(vmx_vpid_lock);
138
139 static struct vmcs_config {
140 int size;
141 int order;
142 u32 revision_id;
143 u32 pin_based_exec_ctrl;
144 u32 cpu_based_exec_ctrl;
145 u32 cpu_based_2nd_exec_ctrl;
146 u32 vmexit_ctrl;
147 u32 vmentry_ctrl;
148 } vmcs_config;
149
150 static struct vmx_capability {
151 u32 ept;
152 u32 vpid;
153 } vmx_capability;
154
155 #define VMX_SEGMENT_FIELD(seg) \
156 [VCPU_SREG_##seg] = { \
157 .selector = GUEST_##seg##_SELECTOR, \
158 .base = GUEST_##seg##_BASE, \
159 .limit = GUEST_##seg##_LIMIT, \
160 .ar_bytes = GUEST_##seg##_AR_BYTES, \
161 }
162
163 static struct kvm_vmx_segment_field {
164 unsigned selector;
165 unsigned base;
166 unsigned limit;
167 unsigned ar_bytes;
168 } kvm_vmx_segment_fields[] = {
169 VMX_SEGMENT_FIELD(CS),
170 VMX_SEGMENT_FIELD(DS),
171 VMX_SEGMENT_FIELD(ES),
172 VMX_SEGMENT_FIELD(FS),
173 VMX_SEGMENT_FIELD(GS),
174 VMX_SEGMENT_FIELD(SS),
175 VMX_SEGMENT_FIELD(TR),
176 VMX_SEGMENT_FIELD(LDTR),
177 };
178
179 static void ept_save_pdptrs(struct kvm_vcpu *vcpu);
180
181 /*
182 * Keep MSR_K6_STAR at the end, as setup_msrs() will try to optimize it
183 * away by decrementing the array size.
184 */
185 static const u32 vmx_msr_index[] = {
186 #ifdef CONFIG_X86_64
187 MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, MSR_KERNEL_GS_BASE,
188 #endif
189 MSR_EFER, MSR_K6_STAR,
190 };
191 #define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
192
193 static void load_msrs(struct kvm_msr_entry *e, int n)
194 {
195 int i;
196
197 for (i = 0; i < n; ++i)
198 wrmsrl(e[i].index, e[i].data);
199 }
200
201 static void save_msrs(struct kvm_msr_entry *e, int n)
202 {
203 int i;
204
205 for (i = 0; i < n; ++i)
206 rdmsrl(e[i].index, e[i].data);
207 }
208
209 static inline int is_page_fault(u32 intr_info)
210 {
211 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
212 INTR_INFO_VALID_MASK)) ==
213 (INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
214 }
215
216 static inline int is_no_device(u32 intr_info)
217 {
218 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
219 INTR_INFO_VALID_MASK)) ==
220 (INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
221 }
222
223 static inline int is_invalid_opcode(u32 intr_info)
224 {
225 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
226 INTR_INFO_VALID_MASK)) ==
227 (INTR_TYPE_HARD_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
228 }
229
230 static inline int is_external_interrupt(u32 intr_info)
231 {
232 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
233 == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
234 }
235
236 static inline int is_machine_check(u32 intr_info)
237 {
238 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
239 INTR_INFO_VALID_MASK)) ==
240 (INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK);
241 }
242
243 static inline int cpu_has_vmx_msr_bitmap(void)
244 {
245 return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS;
246 }
247
248 static inline int cpu_has_vmx_tpr_shadow(void)
249 {
250 return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW;
251 }
252
253 static inline int vm_need_tpr_shadow(struct kvm *kvm)
254 {
255 return (cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm));
256 }
257
258 static inline int cpu_has_secondary_exec_ctrls(void)
259 {
260 return vmcs_config.cpu_based_exec_ctrl &
261 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
262 }
263
264 static inline bool cpu_has_vmx_virtualize_apic_accesses(void)
265 {
266 return vmcs_config.cpu_based_2nd_exec_ctrl &
267 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
268 }
269
270 static inline bool cpu_has_vmx_flexpriority(void)
271 {
272 return cpu_has_vmx_tpr_shadow() &&
273 cpu_has_vmx_virtualize_apic_accesses();
274 }
275
276 static inline bool cpu_has_vmx_ept_execute_only(void)
277 {
278 return !!(vmx_capability.ept & VMX_EPT_EXECUTE_ONLY_BIT);
279 }
280
281 static inline bool cpu_has_vmx_eptp_uncacheable(void)
282 {
283 return !!(vmx_capability.ept & VMX_EPTP_UC_BIT);
284 }
285
286 static inline bool cpu_has_vmx_eptp_writeback(void)
287 {
288 return !!(vmx_capability.ept & VMX_EPTP_WB_BIT);
289 }
290
291 static inline bool cpu_has_vmx_ept_2m_page(void)
292 {
293 return !!(vmx_capability.ept & VMX_EPT_2MB_PAGE_BIT);
294 }
295
296 static inline int cpu_has_vmx_invept_individual_addr(void)
297 {
298 return !!(vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT);
299 }
300
301 static inline int cpu_has_vmx_invept_context(void)
302 {
303 return !!(vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT);
304 }
305
306 static inline int cpu_has_vmx_invept_global(void)
307 {
308 return !!(vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT);
309 }
310
311 static inline int cpu_has_vmx_ept(void)
312 {
313 return vmcs_config.cpu_based_2nd_exec_ctrl &
314 SECONDARY_EXEC_ENABLE_EPT;
315 }
316
317 static inline int cpu_has_vmx_unrestricted_guest(void)
318 {
319 return vmcs_config.cpu_based_2nd_exec_ctrl &
320 SECONDARY_EXEC_UNRESTRICTED_GUEST;
321 }
322
323 static inline int vm_need_virtualize_apic_accesses(struct kvm *kvm)
324 {
325 return flexpriority_enabled &&
326 (cpu_has_vmx_virtualize_apic_accesses()) &&
327 (irqchip_in_kernel(kvm));
328 }
329
330 static inline int cpu_has_vmx_vpid(void)
331 {
332 return vmcs_config.cpu_based_2nd_exec_ctrl &
333 SECONDARY_EXEC_ENABLE_VPID;
334 }
335
336 static inline int cpu_has_virtual_nmis(void)
337 {
338 return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS;
339 }
340
341 static inline bool report_flexpriority(void)
342 {
343 return flexpriority_enabled;
344 }
345
346 static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr)
347 {
348 int i;
349
350 for (i = 0; i < vmx->nmsrs; ++i)
351 if (vmx->guest_msrs[i].index == msr)
352 return i;
353 return -1;
354 }
355
356 static inline void __invvpid(int ext, u16 vpid, gva_t gva)
357 {
358 struct {
359 u64 vpid : 16;
360 u64 rsvd : 48;
361 u64 gva;
362 } operand = { vpid, 0, gva };
363
364 asm volatile (__ex(ASM_VMX_INVVPID)
365 /* CF==1 or ZF==1 --> rc = -1 */
366 "; ja 1f ; ud2 ; 1:"
367 : : "a"(&operand), "c"(ext) : "cc", "memory");
368 }
369
370 static inline void __invept(int ext, u64 eptp, gpa_t gpa)
371 {
372 struct {
373 u64 eptp, gpa;
374 } operand = {eptp, gpa};
375
376 asm volatile (__ex(ASM_VMX_INVEPT)
377 /* CF==1 or ZF==1 --> rc = -1 */
378 "; ja 1f ; ud2 ; 1:\n"
379 : : "a" (&operand), "c" (ext) : "cc", "memory");
380 }
381
382 static struct kvm_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr)
383 {
384 int i;
385
386 i = __find_msr_index(vmx, msr);
387 if (i >= 0)
388 return &vmx->guest_msrs[i];
389 return NULL;
390 }
391
392 static void vmcs_clear(struct vmcs *vmcs)
393 {
394 u64 phys_addr = __pa(vmcs);
395 u8 error;
396
397 asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) "; setna %0"
398 : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
399 : "cc", "memory");
400 if (error)
401 printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
402 vmcs, phys_addr);
403 }
404
405 static void __vcpu_clear(void *arg)
406 {
407 struct vcpu_vmx *vmx = arg;
408 int cpu = raw_smp_processor_id();
409
410 if (vmx->vcpu.cpu == cpu)
411 vmcs_clear(vmx->vmcs);
412 if (per_cpu(current_vmcs, cpu) == vmx->vmcs)
413 per_cpu(current_vmcs, cpu) = NULL;
414 rdtscll(vmx->vcpu.arch.host_tsc);
415 list_del(&vmx->local_vcpus_link);
416 vmx->vcpu.cpu = -1;
417 vmx->launched = 0;
418 }
419
420 static void vcpu_clear(struct vcpu_vmx *vmx)
421 {
422 if (vmx->vcpu.cpu == -1)
423 return;
424 smp_call_function_single(vmx->vcpu.cpu, __vcpu_clear, vmx, 1);
425 }
426
427 static inline void vpid_sync_vcpu_all(struct vcpu_vmx *vmx)
428 {
429 if (vmx->vpid == 0)
430 return;
431
432 __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0);
433 }
434
435 static inline void ept_sync_global(void)
436 {
437 if (cpu_has_vmx_invept_global())
438 __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
439 }
440
441 static inline void ept_sync_context(u64 eptp)
442 {
443 if (enable_ept) {
444 if (cpu_has_vmx_invept_context())
445 __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
446 else
447 ept_sync_global();
448 }
449 }
450
451 static inline void ept_sync_individual_addr(u64 eptp, gpa_t gpa)
452 {
453 if (enable_ept) {
454 if (cpu_has_vmx_invept_individual_addr())
455 __invept(VMX_EPT_EXTENT_INDIVIDUAL_ADDR,
456 eptp, gpa);
457 else
458 ept_sync_context(eptp);
459 }
460 }
461
462 static unsigned long vmcs_readl(unsigned long field)
463 {
464 unsigned long value;
465
466 asm volatile (__ex(ASM_VMX_VMREAD_RDX_RAX)
467 : "=a"(value) : "d"(field) : "cc");
468 return value;
469 }
470
471 static u16 vmcs_read16(unsigned long field)
472 {
473 return vmcs_readl(field);
474 }
475
476 static u32 vmcs_read32(unsigned long field)
477 {
478 return vmcs_readl(field);
479 }
480
481 static u64 vmcs_read64(unsigned long field)
482 {
483 #ifdef CONFIG_X86_64
484 return vmcs_readl(field);
485 #else
486 return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
487 #endif
488 }
489
490 static noinline void vmwrite_error(unsigned long field, unsigned long value)
491 {
492 printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
493 field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
494 dump_stack();
495 }
496
497 static void vmcs_writel(unsigned long field, unsigned long value)
498 {
499 u8 error;
500
501 asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) "; setna %0"
502 : "=q"(error) : "a"(value), "d"(field) : "cc");
503 if (unlikely(error))
504 vmwrite_error(field, value);
505 }
506
507 static void vmcs_write16(unsigned long field, u16 value)
508 {
509 vmcs_writel(field, value);
510 }
511
512 static void vmcs_write32(unsigned long field, u32 value)
513 {
514 vmcs_writel(field, value);
515 }
516
517 static void vmcs_write64(unsigned long field, u64 value)
518 {
519 vmcs_writel(field, value);
520 #ifndef CONFIG_X86_64
521 asm volatile ("");
522 vmcs_writel(field+1, value >> 32);
523 #endif
524 }
525
526 static void vmcs_clear_bits(unsigned long field, u32 mask)
527 {
528 vmcs_writel(field, vmcs_readl(field) & ~mask);
529 }
530
531 static void vmcs_set_bits(unsigned long field, u32 mask)
532 {
533 vmcs_writel(field, vmcs_readl(field) | mask);
534 }
535
536 static void update_exception_bitmap(struct kvm_vcpu *vcpu)
537 {
538 u32 eb;
539
540 eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR);
541 if (!vcpu->fpu_active)
542 eb |= 1u << NM_VECTOR;
543 /*
544 * Unconditionally intercept #DB so we can maintain dr6 without
545 * reading it every exit.
546 */
547 eb |= 1u << DB_VECTOR;
548 if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
549 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
550 eb |= 1u << BP_VECTOR;
551 }
552 if (to_vmx(vcpu)->rmode.vm86_active)
553 eb = ~0;
554 if (enable_ept)
555 eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */
556 vmcs_write32(EXCEPTION_BITMAP, eb);
557 }
558
559 static void reload_tss(void)
560 {
561 /*
562 * VT restores TR but not its size. Useless.
563 */
564 struct descriptor_table gdt;
565 struct desc_struct *descs;
566
567 kvm_get_gdt(&gdt);
568 descs = (void *)gdt.base;
569 descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
570 load_TR_desc();
571 }
572
573 static void load_transition_efer(struct vcpu_vmx *vmx)
574 {
575 int efer_offset = vmx->msr_offset_efer;
576 u64 host_efer;
577 u64 guest_efer;
578 u64 ignore_bits;
579
580 if (efer_offset < 0)
581 return;
582 host_efer = vmx->host_msrs[efer_offset].data;
583 guest_efer = vmx->guest_msrs[efer_offset].data;
584
585 /*
586 * NX is emulated; LMA and LME handled by hardware; SCE meaninless
587 * outside long mode
588 */
589 ignore_bits = EFER_NX | EFER_SCE;
590 #ifdef CONFIG_X86_64
591 ignore_bits |= EFER_LMA | EFER_LME;
592 /* SCE is meaningful only in long mode on Intel */
593 if (guest_efer & EFER_LMA)
594 ignore_bits &= ~(u64)EFER_SCE;
595 #endif
596 if ((guest_efer & ~ignore_bits) == (host_efer & ~ignore_bits))
597 return;
598
599 vmx->host_state.guest_efer_loaded = 1;
600 guest_efer &= ~ignore_bits;
601 guest_efer |= host_efer & ignore_bits;
602 wrmsrl(MSR_EFER, guest_efer);
603 vmx->vcpu.stat.efer_reload++;
604 }
605
606 static void reload_host_efer(struct vcpu_vmx *vmx)
607 {
608 if (vmx->host_state.guest_efer_loaded) {
609 vmx->host_state.guest_efer_loaded = 0;
610 load_msrs(vmx->host_msrs + vmx->msr_offset_efer, 1);
611 }
612 }
613
614 static void vmx_save_host_state(struct kvm_vcpu *vcpu)
615 {
616 struct vcpu_vmx *vmx = to_vmx(vcpu);
617
618 if (vmx->host_state.loaded)
619 return;
620
621 vmx->host_state.loaded = 1;
622 /*
623 * Set host fs and gs selectors. Unfortunately, 22.2.3 does not
624 * allow segment selectors with cpl > 0 or ti == 1.
625 */
626 vmx->host_state.ldt_sel = kvm_read_ldt();
627 vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;
628 vmx->host_state.fs_sel = kvm_read_fs();
629 if (!(vmx->host_state.fs_sel & 7)) {
630 vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
631 vmx->host_state.fs_reload_needed = 0;
632 } else {
633 vmcs_write16(HOST_FS_SELECTOR, 0);
634 vmx->host_state.fs_reload_needed = 1;
635 }
636 vmx->host_state.gs_sel = kvm_read_gs();
637 if (!(vmx->host_state.gs_sel & 7))
638 vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel);
639 else {
640 vmcs_write16(HOST_GS_SELECTOR, 0);
641 vmx->host_state.gs_ldt_reload_needed = 1;
642 }
643
644 #ifdef CONFIG_X86_64
645 vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
646 vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
647 #else
648 vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
649 vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
650 #endif
651
652 #ifdef CONFIG_X86_64
653 if (is_long_mode(&vmx->vcpu))
654 save_msrs(vmx->host_msrs +
655 vmx->msr_offset_kernel_gs_base, 1);
656
657 #endif
658 load_msrs(vmx->guest_msrs, vmx->save_nmsrs);
659 load_transition_efer(vmx);
660 }
661
662 static void __vmx_load_host_state(struct vcpu_vmx *vmx)
663 {
664 unsigned long flags;
665
666 if (!vmx->host_state.loaded)
667 return;
668
669 ++vmx->vcpu.stat.host_state_reload;
670 vmx->host_state.loaded = 0;
671 if (vmx->host_state.fs_reload_needed)
672 kvm_load_fs(vmx->host_state.fs_sel);
673 if (vmx->host_state.gs_ldt_reload_needed) {
674 kvm_load_ldt(vmx->host_state.ldt_sel);
675 /*
676 * If we have to reload gs, we must take care to
677 * preserve our gs base.
678 */
679 local_irq_save(flags);
680 kvm_load_gs(vmx->host_state.gs_sel);
681 #ifdef CONFIG_X86_64
682 wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
683 #endif
684 local_irq_restore(flags);
685 }
686 reload_tss();
687 save_msrs(vmx->guest_msrs, vmx->save_nmsrs);
688 load_msrs(vmx->host_msrs, vmx->save_nmsrs);
689 reload_host_efer(vmx);
690 }
691
692 static void vmx_load_host_state(struct vcpu_vmx *vmx)
693 {
694 preempt_disable();
695 __vmx_load_host_state(vmx);
696 preempt_enable();
697 }
698
699 /*
700 * Switches to specified vcpu, until a matching vcpu_put(), but assumes
701 * vcpu mutex is already taken.
702 */
703 static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
704 {
705 struct vcpu_vmx *vmx = to_vmx(vcpu);
706 u64 phys_addr = __pa(vmx->vmcs);
707 u64 tsc_this, delta, new_offset;
708
709 if (vcpu->cpu != cpu) {
710 vcpu_clear(vmx);
711 kvm_migrate_timers(vcpu);
712 set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests);
713 local_irq_disable();
714 list_add(&vmx->local_vcpus_link,
715 &per_cpu(vcpus_on_cpu, cpu));
716 local_irq_enable();
717 }
718
719 if (per_cpu(current_vmcs, cpu) != vmx->vmcs) {
720 u8 error;
721
722 per_cpu(current_vmcs, cpu) = vmx->vmcs;
723 asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
724 : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
725 : "cc");
726 if (error)
727 printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
728 vmx->vmcs, phys_addr);
729 }
730
731 if (vcpu->cpu != cpu) {
732 struct descriptor_table dt;
733 unsigned long sysenter_esp;
734
735 vcpu->cpu = cpu;
736 /*
737 * Linux uses per-cpu TSS and GDT, so set these when switching
738 * processors.
739 */
740 vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */
741 kvm_get_gdt(&dt);
742 vmcs_writel(HOST_GDTR_BASE, dt.base); /* 22.2.4 */
743
744 rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
745 vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
746
747 /*
748 * Make sure the time stamp counter is monotonous.
749 */
750 rdtscll(tsc_this);
751 if (tsc_this < vcpu->arch.host_tsc) {
752 delta = vcpu->arch.host_tsc - tsc_this;
753 new_offset = vmcs_read64(TSC_OFFSET) + delta;
754 vmcs_write64(TSC_OFFSET, new_offset);
755 }
756 }
757 }
758
759 static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
760 {
761 __vmx_load_host_state(to_vmx(vcpu));
762 }
763
764 static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
765 {
766 if (vcpu->fpu_active)
767 return;
768 vcpu->fpu_active = 1;
769 vmcs_clear_bits(GUEST_CR0, X86_CR0_TS);
770 if (vcpu->arch.cr0 & X86_CR0_TS)
771 vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
772 update_exception_bitmap(vcpu);
773 }
774
775 static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
776 {
777 if (!vcpu->fpu_active)
778 return;
779 vcpu->fpu_active = 0;
780 vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
781 update_exception_bitmap(vcpu);
782 }
783
784 static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
785 {
786 unsigned long rflags;
787
788 rflags = vmcs_readl(GUEST_RFLAGS);
789 if (to_vmx(vcpu)->rmode.vm86_active)
790 rflags &= ~(unsigned long)(X86_EFLAGS_IOPL | X86_EFLAGS_VM);
791 return rflags;
792 }
793
794 static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
795 {
796 if (to_vmx(vcpu)->rmode.vm86_active)
797 rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
798 vmcs_writel(GUEST_RFLAGS, rflags);
799 }
800
801 static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
802 {
803 u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
804 int ret = 0;
805
806 if (interruptibility & GUEST_INTR_STATE_STI)
807 ret |= X86_SHADOW_INT_STI;
808 if (interruptibility & GUEST_INTR_STATE_MOV_SS)
809 ret |= X86_SHADOW_INT_MOV_SS;
810
811 return ret & mask;
812 }
813
814 static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
815 {
816 u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
817 u32 interruptibility = interruptibility_old;
818
819 interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS);
820
821 if (mask & X86_SHADOW_INT_MOV_SS)
822 interruptibility |= GUEST_INTR_STATE_MOV_SS;
823 if (mask & X86_SHADOW_INT_STI)
824 interruptibility |= GUEST_INTR_STATE_STI;
825
826 if ((interruptibility != interruptibility_old))
827 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility);
828 }
829
830 static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
831 {
832 unsigned long rip;
833
834 rip = kvm_rip_read(vcpu);
835 rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
836 kvm_rip_write(vcpu, rip);
837
838 /* skipping an emulated instruction also counts */
839 vmx_set_interrupt_shadow(vcpu, 0);
840 }
841
842 static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
843 bool has_error_code, u32 error_code)
844 {
845 struct vcpu_vmx *vmx = to_vmx(vcpu);
846 u32 intr_info = nr | INTR_INFO_VALID_MASK;
847
848 if (has_error_code) {
849 vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
850 intr_info |= INTR_INFO_DELIVER_CODE_MASK;
851 }
852
853 if (vmx->rmode.vm86_active) {
854 vmx->rmode.irq.pending = true;
855 vmx->rmode.irq.vector = nr;
856 vmx->rmode.irq.rip = kvm_rip_read(vcpu);
857 if (kvm_exception_is_soft(nr))
858 vmx->rmode.irq.rip +=
859 vmx->vcpu.arch.event_exit_inst_len;
860 intr_info |= INTR_TYPE_SOFT_INTR;
861 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
862 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
863 kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
864 return;
865 }
866
867 if (kvm_exception_is_soft(nr)) {
868 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
869 vmx->vcpu.arch.event_exit_inst_len);
870 intr_info |= INTR_TYPE_SOFT_EXCEPTION;
871 } else
872 intr_info |= INTR_TYPE_HARD_EXCEPTION;
873
874 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
875 }
876
877 /*
878 * Swap MSR entry in host/guest MSR entry array.
879 */
880 #ifdef CONFIG_X86_64
881 static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
882 {
883 struct kvm_msr_entry tmp;
884
885 tmp = vmx->guest_msrs[to];
886 vmx->guest_msrs[to] = vmx->guest_msrs[from];
887 vmx->guest_msrs[from] = tmp;
888 tmp = vmx->host_msrs[to];
889 vmx->host_msrs[to] = vmx->host_msrs[from];
890 vmx->host_msrs[from] = tmp;
891 }
892 #endif
893
894 /*
895 * Set up the vmcs to automatically save and restore system
896 * msrs. Don't touch the 64-bit msrs if the guest is in legacy
897 * mode, as fiddling with msrs is very expensive.
898 */
899 static void setup_msrs(struct vcpu_vmx *vmx)
900 {
901 int save_nmsrs;
902 unsigned long *msr_bitmap;
903
904 vmx_load_host_state(vmx);
905 save_nmsrs = 0;
906 #ifdef CONFIG_X86_64
907 if (is_long_mode(&vmx->vcpu)) {
908 int index;
909
910 index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
911 if (index >= 0)
912 move_msr_up(vmx, index, save_nmsrs++);
913 index = __find_msr_index(vmx, MSR_LSTAR);
914 if (index >= 0)
915 move_msr_up(vmx, index, save_nmsrs++);
916 index = __find_msr_index(vmx, MSR_CSTAR);
917 if (index >= 0)
918 move_msr_up(vmx, index, save_nmsrs++);
919 index = __find_msr_index(vmx, MSR_KERNEL_GS_BASE);
920 if (index >= 0)
921 move_msr_up(vmx, index, save_nmsrs++);
922 /*
923 * MSR_K6_STAR is only needed on long mode guests, and only
924 * if efer.sce is enabled.
925 */
926 index = __find_msr_index(vmx, MSR_K6_STAR);
927 if ((index >= 0) && (vmx->vcpu.arch.shadow_efer & EFER_SCE))
928 move_msr_up(vmx, index, save_nmsrs++);
929 }
930 #endif
931 vmx->save_nmsrs = save_nmsrs;
932
933 #ifdef CONFIG_X86_64
934 vmx->msr_offset_kernel_gs_base =
935 __find_msr_index(vmx, MSR_KERNEL_GS_BASE);
936 #endif
937 vmx->msr_offset_efer = __find_msr_index(vmx, MSR_EFER);
938
939 if (cpu_has_vmx_msr_bitmap()) {
940 if (is_long_mode(&vmx->vcpu))
941 msr_bitmap = vmx_msr_bitmap_longmode;
942 else
943 msr_bitmap = vmx_msr_bitmap_legacy;
944
945 vmcs_write64(MSR_BITMAP, __pa(msr_bitmap));
946 }
947 }
948
949 /*
950 * reads and returns guest's timestamp counter "register"
951 * guest_tsc = host_tsc + tsc_offset -- 21.3
952 */
953 static u64 guest_read_tsc(void)
954 {
955 u64 host_tsc, tsc_offset;
956
957 rdtscll(host_tsc);
958 tsc_offset = vmcs_read64(TSC_OFFSET);
959 return host_tsc + tsc_offset;
960 }
961
962 /*
963 * writes 'guest_tsc' into guest's timestamp counter "register"
964 * guest_tsc = host_tsc + tsc_offset ==> tsc_offset = guest_tsc - host_tsc
965 */
966 static void guest_write_tsc(u64 guest_tsc, u64 host_tsc)
967 {
968 vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc);
969 }
970
971 /*
972 * Reads an msr value (of 'msr_index') into 'pdata'.
973 * Returns 0 on success, non-0 otherwise.
974 * Assumes vcpu_load() was already called.
975 */
976 static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
977 {
978 u64 data;
979 struct kvm_msr_entry *msr;
980
981 if (!pdata) {
982 printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
983 return -EINVAL;
984 }
985
986 switch (msr_index) {
987 #ifdef CONFIG_X86_64
988 case MSR_FS_BASE:
989 data = vmcs_readl(GUEST_FS_BASE);
990 break;
991 case MSR_GS_BASE:
992 data = vmcs_readl(GUEST_GS_BASE);
993 break;
994 case MSR_EFER:
995 return kvm_get_msr_common(vcpu, msr_index, pdata);
996 #endif
997 case MSR_IA32_TSC:
998 data = guest_read_tsc();
999 break;
1000 case MSR_IA32_SYSENTER_CS:
1001 data = vmcs_read32(GUEST_SYSENTER_CS);
1002 break;
1003 case MSR_IA32_SYSENTER_EIP:
1004 data = vmcs_readl(GUEST_SYSENTER_EIP);
1005 break;
1006 case MSR_IA32_SYSENTER_ESP:
1007 data = vmcs_readl(GUEST_SYSENTER_ESP);
1008 break;
1009 default:
1010 msr = find_msr_entry(to_vmx(vcpu), msr_index);
1011 if (msr) {
1012 vmx_load_host_state(to_vmx(vcpu));
1013 data = msr->data;
1014 break;
1015 }
1016 return kvm_get_msr_common(vcpu, msr_index, pdata);
1017 }
1018
1019 *pdata = data;
1020 return 0;
1021 }
1022
1023 /*
1024 * Writes msr value into into the appropriate "register".
1025 * Returns 0 on success, non-0 otherwise.
1026 * Assumes vcpu_load() was already called.
1027 */
1028 static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1029 {
1030 struct vcpu_vmx *vmx = to_vmx(vcpu);
1031 struct kvm_msr_entry *msr;
1032 u64 host_tsc;
1033 int ret = 0;
1034
1035 switch (msr_index) {
1036 case MSR_EFER:
1037 vmx_load_host_state(vmx);
1038 ret = kvm_set_msr_common(vcpu, msr_index, data);
1039 break;
1040 #ifdef CONFIG_X86_64
1041 case MSR_FS_BASE:
1042 vmcs_writel(GUEST_FS_BASE, data);
1043 break;
1044 case MSR_GS_BASE:
1045 vmcs_writel(GUEST_GS_BASE, data);
1046 break;
1047 #endif
1048 case MSR_IA32_SYSENTER_CS:
1049 vmcs_write32(GUEST_SYSENTER_CS, data);
1050 break;
1051 case MSR_IA32_SYSENTER_EIP:
1052 vmcs_writel(GUEST_SYSENTER_EIP, data);
1053 break;
1054 case MSR_IA32_SYSENTER_ESP:
1055 vmcs_writel(GUEST_SYSENTER_ESP, data);
1056 break;
1057 case MSR_IA32_TSC:
1058 rdtscll(host_tsc);
1059 guest_write_tsc(data, host_tsc);
1060 break;
1061 case MSR_IA32_CR_PAT:
1062 if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
1063 vmcs_write64(GUEST_IA32_PAT, data);
1064 vcpu->arch.pat = data;
1065 break;
1066 }
1067 /* Otherwise falls through to kvm_set_msr_common */
1068 default:
1069 msr = find_msr_entry(vmx, msr_index);
1070 if (msr) {
1071 vmx_load_host_state(vmx);
1072 msr->data = data;
1073 break;
1074 }
1075 ret = kvm_set_msr_common(vcpu, msr_index, data);
1076 }
1077
1078 return ret;
1079 }
1080
1081 static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
1082 {
1083 __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
1084 switch (reg) {
1085 case VCPU_REGS_RSP:
1086 vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
1087 break;
1088 case VCPU_REGS_RIP:
1089 vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP);
1090 break;
1091 case VCPU_EXREG_PDPTR:
1092 if (enable_ept)
1093 ept_save_pdptrs(vcpu);
1094 break;
1095 default:
1096 break;
1097 }
1098 }
1099
1100 static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
1101 {
1102 int old_debug = vcpu->guest_debug;
1103 unsigned long flags;
1104
1105 vcpu->guest_debug = dbg->control;
1106 if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
1107 vcpu->guest_debug = 0;
1108
1109 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
1110 vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]);
1111 else
1112 vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
1113
1114 flags = vmcs_readl(GUEST_RFLAGS);
1115 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
1116 flags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
1117 else if (old_debug & KVM_GUESTDBG_SINGLESTEP)
1118 flags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1119 vmcs_writel(GUEST_RFLAGS, flags);
1120
1121 update_exception_bitmap(vcpu);
1122
1123 return 0;
1124 }
1125
1126 static __init int cpu_has_kvm_support(void)
1127 {
1128 return cpu_has_vmx();
1129 }
1130
1131 static __init int vmx_disabled_by_bios(void)
1132 {
1133 u64 msr;
1134
1135 rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
1136 return (msr & (FEATURE_CONTROL_LOCKED |
1137 FEATURE_CONTROL_VMXON_ENABLED))
1138 == FEATURE_CONTROL_LOCKED;
1139 /* locked but not enabled */
1140 }
1141
1142 static void hardware_enable(void *garbage)
1143 {
1144 int cpu = raw_smp_processor_id();
1145 u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
1146 u64 old;
1147
1148 INIT_LIST_HEAD(&per_cpu(vcpus_on_cpu, cpu));
1149 rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
1150 if ((old & (FEATURE_CONTROL_LOCKED |
1151 FEATURE_CONTROL_VMXON_ENABLED))
1152 != (FEATURE_CONTROL_LOCKED |
1153 FEATURE_CONTROL_VMXON_ENABLED))
1154 /* enable and lock */
1155 wrmsrl(MSR_IA32_FEATURE_CONTROL, old |
1156 FEATURE_CONTROL_LOCKED |
1157 FEATURE_CONTROL_VMXON_ENABLED);
1158 write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
1159 asm volatile (ASM_VMX_VMXON_RAX
1160 : : "a"(&phys_addr), "m"(phys_addr)
1161 : "memory", "cc");
1162 }
1163
1164 static void vmclear_local_vcpus(void)
1165 {
1166 int cpu = raw_smp_processor_id();
1167 struct vcpu_vmx *vmx, *n;
1168
1169 list_for_each_entry_safe(vmx, n, &per_cpu(vcpus_on_cpu, cpu),
1170 local_vcpus_link)
1171 __vcpu_clear(vmx);
1172 }
1173
1174
1175 /* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot()
1176 * tricks.
1177 */
1178 static void kvm_cpu_vmxoff(void)
1179 {
1180 asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
1181 write_cr4(read_cr4() & ~X86_CR4_VMXE);
1182 }
1183
1184 static void hardware_disable(void *garbage)
1185 {
1186 vmclear_local_vcpus();
1187 kvm_cpu_vmxoff();
1188 }
1189
1190 static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
1191 u32 msr, u32 *result)
1192 {
1193 u32 vmx_msr_low, vmx_msr_high;
1194 u32 ctl = ctl_min | ctl_opt;
1195
1196 rdmsr(msr, vmx_msr_low, vmx_msr_high);
1197
1198 ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */
1199 ctl |= vmx_msr_low; /* bit == 1 in low word ==> must be one */
1200
1201 /* Ensure minimum (required) set of control bits are supported. */
1202 if (ctl_min & ~ctl)
1203 return -EIO;
1204
1205 *result = ctl;
1206 return 0;
1207 }
1208
1209 static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
1210 {
1211 u32 vmx_msr_low, vmx_msr_high;
1212 u32 min, opt, min2, opt2;
1213 u32 _pin_based_exec_control = 0;
1214 u32 _cpu_based_exec_control = 0;
1215 u32 _cpu_based_2nd_exec_control = 0;
1216 u32 _vmexit_control = 0;
1217 u32 _vmentry_control = 0;
1218
1219 min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
1220 opt = PIN_BASED_VIRTUAL_NMIS;
1221 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
1222 &_pin_based_exec_control) < 0)
1223 return -EIO;
1224
1225 min = CPU_BASED_HLT_EXITING |
1226 #ifdef CONFIG_X86_64
1227 CPU_BASED_CR8_LOAD_EXITING |
1228 CPU_BASED_CR8_STORE_EXITING |
1229 #endif
1230 CPU_BASED_CR3_LOAD_EXITING |
1231 CPU_BASED_CR3_STORE_EXITING |
1232 CPU_BASED_USE_IO_BITMAPS |
1233 CPU_BASED_MOV_DR_EXITING |
1234 CPU_BASED_USE_TSC_OFFSETING |
1235 CPU_BASED_INVLPG_EXITING;
1236 opt = CPU_BASED_TPR_SHADOW |
1237 CPU_BASED_USE_MSR_BITMAPS |
1238 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
1239 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
1240 &_cpu_based_exec_control) < 0)
1241 return -EIO;
1242 #ifdef CONFIG_X86_64
1243 if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
1244 _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
1245 ~CPU_BASED_CR8_STORE_EXITING;
1246 #endif
1247 if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
1248 min2 = 0;
1249 opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
1250 SECONDARY_EXEC_WBINVD_EXITING |
1251 SECONDARY_EXEC_ENABLE_VPID |
1252 SECONDARY_EXEC_ENABLE_EPT |
1253 SECONDARY_EXEC_UNRESTRICTED_GUEST;
1254 if (adjust_vmx_controls(min2, opt2,
1255 MSR_IA32_VMX_PROCBASED_CTLS2,
1256 &_cpu_based_2nd_exec_control) < 0)
1257 return -EIO;
1258 }
1259 #ifndef CONFIG_X86_64
1260 if (!(_cpu_based_2nd_exec_control &
1261 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
1262 _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW;
1263 #endif
1264 if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
1265 /* CR3 accesses and invlpg don't need to cause VM Exits when EPT
1266 enabled */
1267 _cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING |
1268 CPU_BASED_CR3_STORE_EXITING |
1269 CPU_BASED_INVLPG_EXITING);
1270 rdmsr(MSR_IA32_VMX_EPT_VPID_CAP,
1271 vmx_capability.ept, vmx_capability.vpid);
1272 }
1273
1274 min = 0;
1275 #ifdef CONFIG_X86_64
1276 min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
1277 #endif
1278 opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT;
1279 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
1280 &_vmexit_control) < 0)
1281 return -EIO;
1282
1283 min = 0;
1284 opt = VM_ENTRY_LOAD_IA32_PAT;
1285 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
1286 &_vmentry_control) < 0)
1287 return -EIO;
1288
1289 rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
1290
1291 /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
1292 if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
1293 return -EIO;
1294
1295 #ifdef CONFIG_X86_64
1296 /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
1297 if (vmx_msr_high & (1u<<16))
1298 return -EIO;
1299 #endif
1300
1301 /* Require Write-Back (WB) memory type for VMCS accesses. */
1302 if (((vmx_msr_high >> 18) & 15) != 6)
1303 return -EIO;
1304
1305 vmcs_conf->size = vmx_msr_high & 0x1fff;
1306 vmcs_conf->order = get_order(vmcs_config.size);
1307 vmcs_conf->revision_id = vmx_msr_low;
1308
1309 vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
1310 vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
1311 vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
1312 vmcs_conf->vmexit_ctrl = _vmexit_control;
1313 vmcs_conf->vmentry_ctrl = _vmentry_control;
1314
1315 return 0;
1316 }
1317
1318 static struct vmcs *alloc_vmcs_cpu(int cpu)
1319 {
1320 int node = cpu_to_node(cpu);
1321 struct page *pages;
1322 struct vmcs *vmcs;
1323
1324 pages = alloc_pages_exact_node(node, GFP_KERNEL, vmcs_config.order);
1325 if (!pages)
1326 return NULL;
1327 vmcs = page_address(pages);
1328 memset(vmcs, 0, vmcs_config.size);
1329 vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
1330 return vmcs;
1331 }
1332
1333 static struct vmcs *alloc_vmcs(void)
1334 {
1335 return alloc_vmcs_cpu(raw_smp_processor_id());
1336 }
1337
1338 static void free_vmcs(struct vmcs *vmcs)
1339 {
1340 free_pages((unsigned long)vmcs, vmcs_config.order);
1341 }
1342
1343 static void free_kvm_area(void)
1344 {
1345 int cpu;
1346
1347 for_each_online_cpu(cpu)
1348 free_vmcs(per_cpu(vmxarea, cpu));
1349 }
1350
1351 static __init int alloc_kvm_area(void)
1352 {
1353 int cpu;
1354
1355 for_each_online_cpu(cpu) {
1356 struct vmcs *vmcs;
1357
1358 vmcs = alloc_vmcs_cpu(cpu);
1359 if (!vmcs) {
1360 free_kvm_area();
1361 return -ENOMEM;
1362 }
1363
1364 per_cpu(vmxarea, cpu) = vmcs;
1365 }
1366 return 0;
1367 }
1368
1369 static __init int hardware_setup(void)
1370 {
1371 if (setup_vmcs_config(&vmcs_config) < 0)
1372 return -EIO;
1373
1374 if (boot_cpu_has(X86_FEATURE_NX))
1375 kvm_enable_efer_bits(EFER_NX);
1376
1377 if (!cpu_has_vmx_vpid())
1378 enable_vpid = 0;
1379
1380 if (!cpu_has_vmx_ept()) {
1381 enable_ept = 0;
1382 enable_unrestricted_guest = 0;
1383 }
1384
1385 if (!cpu_has_vmx_unrestricted_guest())
1386 enable_unrestricted_guest = 0;
1387
1388 if (!cpu_has_vmx_flexpriority())
1389 flexpriority_enabled = 0;
1390
1391 if (!cpu_has_vmx_tpr_shadow())
1392 kvm_x86_ops->update_cr8_intercept = NULL;
1393
1394 if (enable_ept && !cpu_has_vmx_ept_2m_page())
1395 kvm_disable_largepages();
1396
1397 return alloc_kvm_area();
1398 }
1399
1400 static __exit void hardware_unsetup(void)
1401 {
1402 free_kvm_area();
1403 }
1404
1405 static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
1406 {
1407 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1408
1409 if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
1410 vmcs_write16(sf->selector, save->selector);
1411 vmcs_writel(sf->base, save->base);
1412 vmcs_write32(sf->limit, save->limit);
1413 vmcs_write32(sf->ar_bytes, save->ar);
1414 } else {
1415 u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
1416 << AR_DPL_SHIFT;
1417 vmcs_write32(sf->ar_bytes, 0x93 | dpl);
1418 }
1419 }
1420
1421 static void enter_pmode(struct kvm_vcpu *vcpu)
1422 {
1423 unsigned long flags;
1424 struct vcpu_vmx *vmx = to_vmx(vcpu);
1425
1426 vmx->emulation_required = 1;
1427 vmx->rmode.vm86_active = 0;
1428
1429 vmcs_writel(GUEST_TR_BASE, vmx->rmode.tr.base);
1430 vmcs_write32(GUEST_TR_LIMIT, vmx->rmode.tr.limit);
1431 vmcs_write32(GUEST_TR_AR_BYTES, vmx->rmode.tr.ar);
1432
1433 flags = vmcs_readl(GUEST_RFLAGS);
1434 flags &= ~(X86_EFLAGS_IOPL | X86_EFLAGS_VM);
1435 flags |= (vmx->rmode.save_iopl << IOPL_SHIFT);
1436 vmcs_writel(GUEST_RFLAGS, flags);
1437
1438 vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
1439 (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
1440
1441 update_exception_bitmap(vcpu);
1442
1443 if (emulate_invalid_guest_state)
1444 return;
1445
1446 fix_pmode_dataseg(VCPU_SREG_ES, &vmx->rmode.es);
1447 fix_pmode_dataseg(VCPU_SREG_DS, &vmx->rmode.ds);
1448 fix_pmode_dataseg(VCPU_SREG_GS, &vmx->rmode.gs);
1449 fix_pmode_dataseg(VCPU_SREG_FS, &vmx->rmode.fs);
1450
1451 vmcs_write16(GUEST_SS_SELECTOR, 0);
1452 vmcs_write32(GUEST_SS_AR_BYTES, 0x93);
1453
1454 vmcs_write16(GUEST_CS_SELECTOR,
1455 vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK);
1456 vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
1457 }
1458
1459 static gva_t rmode_tss_base(struct kvm *kvm)
1460 {
1461 if (!kvm->arch.tss_addr) {
1462 gfn_t base_gfn = kvm->memslots[0].base_gfn +
1463 kvm->memslots[0].npages - 3;
1464 return base_gfn << PAGE_SHIFT;
1465 }
1466 return kvm->arch.tss_addr;
1467 }
1468
1469 static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
1470 {
1471 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1472
1473 save->selector = vmcs_read16(sf->selector);
1474 save->base = vmcs_readl(sf->base);
1475 save->limit = vmcs_read32(sf->limit);
1476 save->ar = vmcs_read32(sf->ar_bytes);
1477 vmcs_write16(sf->selector, save->base >> 4);
1478 vmcs_write32(sf->base, save->base & 0xfffff);
1479 vmcs_write32(sf->limit, 0xffff);
1480 vmcs_write32(sf->ar_bytes, 0xf3);
1481 }
1482
1483 static void enter_rmode(struct kvm_vcpu *vcpu)
1484 {
1485 unsigned long flags;
1486 struct vcpu_vmx *vmx = to_vmx(vcpu);
1487
1488 if (enable_unrestricted_guest)
1489 return;
1490
1491 vmx->emulation_required = 1;
1492 vmx->rmode.vm86_active = 1;
1493
1494 vmx->rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
1495 vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));
1496
1497 vmx->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
1498 vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);
1499
1500 vmx->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
1501 vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
1502
1503 flags = vmcs_readl(GUEST_RFLAGS);
1504 vmx->rmode.save_iopl
1505 = (flags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
1506
1507 flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
1508
1509 vmcs_writel(GUEST_RFLAGS, flags);
1510 vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
1511 update_exception_bitmap(vcpu);
1512
1513 if (emulate_invalid_guest_state)
1514 goto continue_rmode;
1515
1516 vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
1517 vmcs_write32(GUEST_SS_LIMIT, 0xffff);
1518 vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
1519
1520 vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
1521 vmcs_write32(GUEST_CS_LIMIT, 0xffff);
1522 if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
1523 vmcs_writel(GUEST_CS_BASE, 0xf0000);
1524 vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);
1525
1526 fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.es);
1527 fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.ds);
1528 fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.gs);
1529 fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.fs);
1530
1531 continue_rmode:
1532 kvm_mmu_reset_context(vcpu);
1533 init_rmode(vcpu->kvm);
1534 }
1535
1536 static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
1537 {
1538 struct vcpu_vmx *vmx = to_vmx(vcpu);
1539 struct kvm_msr_entry *msr = find_msr_entry(vmx, MSR_EFER);
1540
1541 vcpu->arch.shadow_efer = efer;
1542 if (!msr)
1543 return;
1544 if (efer & EFER_LMA) {
1545 vmcs_write32(VM_ENTRY_CONTROLS,
1546 vmcs_read32(VM_ENTRY_CONTROLS) |
1547 VM_ENTRY_IA32E_MODE);
1548 msr->data = efer;
1549 } else {
1550 vmcs_write32(VM_ENTRY_CONTROLS,
1551 vmcs_read32(VM_ENTRY_CONTROLS) &
1552 ~VM_ENTRY_IA32E_MODE);
1553
1554 msr->data = efer & ~EFER_LME;
1555 }
1556 setup_msrs(vmx);
1557 }
1558
1559 #ifdef CONFIG_X86_64
1560
1561 static void enter_lmode(struct kvm_vcpu *vcpu)
1562 {
1563 u32 guest_tr_ar;
1564
1565 guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
1566 if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
1567 printk(KERN_DEBUG "%s: tss fixup for long mode. \n",
1568 __func__);
1569 vmcs_write32(GUEST_TR_AR_BYTES,
1570 (guest_tr_ar & ~AR_TYPE_MASK)
1571 | AR_TYPE_BUSY_64_TSS);
1572 }
1573 vcpu->arch.shadow_efer |= EFER_LMA;
1574 vmx_set_efer(vcpu, vcpu->arch.shadow_efer);
1575 }
1576
1577 static void exit_lmode(struct kvm_vcpu *vcpu)
1578 {
1579 vcpu->arch.shadow_efer &= ~EFER_LMA;
1580
1581 vmcs_write32(VM_ENTRY_CONTROLS,
1582 vmcs_read32(VM_ENTRY_CONTROLS)
1583 & ~VM_ENTRY_IA32E_MODE);
1584 }
1585
1586 #endif
1587
1588 static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
1589 {
1590 vpid_sync_vcpu_all(to_vmx(vcpu));
1591 if (enable_ept)
1592 ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa));
1593 }
1594
1595 static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
1596 {
1597 vcpu->arch.cr4 &= KVM_GUEST_CR4_MASK;
1598 vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK;
1599 }
1600
1601 static void ept_load_pdptrs(struct kvm_vcpu *vcpu)
1602 {
1603 if (!test_bit(VCPU_EXREG_PDPTR,
1604 (unsigned long *)&vcpu->arch.regs_dirty))
1605 return;
1606
1607 if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
1608 vmcs_write64(GUEST_PDPTR0, vcpu->arch.pdptrs[0]);
1609 vmcs_write64(GUEST_PDPTR1, vcpu->arch.pdptrs[1]);
1610 vmcs_write64(GUEST_PDPTR2, vcpu->arch.pdptrs[2]);
1611 vmcs_write64(GUEST_PDPTR3, vcpu->arch.pdptrs[3]);
1612 }
1613 }
1614
1615 static void ept_save_pdptrs(struct kvm_vcpu *vcpu)
1616 {
1617 if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
1618 vcpu->arch.pdptrs[0] = vmcs_read64(GUEST_PDPTR0);
1619 vcpu->arch.pdptrs[1] = vmcs_read64(GUEST_PDPTR1);
1620 vcpu->arch.pdptrs[2] = vmcs_read64(GUEST_PDPTR2);
1621 vcpu->arch.pdptrs[3] = vmcs_read64(GUEST_PDPTR3);
1622 }
1623
1624 __set_bit(VCPU_EXREG_PDPTR,
1625 (unsigned long *)&vcpu->arch.regs_avail);
1626 __set_bit(VCPU_EXREG_PDPTR,
1627 (unsigned long *)&vcpu->arch.regs_dirty);
1628 }
1629
1630 static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
1631
1632 static void ept_update_paging_mode_cr0(unsigned long *hw_cr0,
1633 unsigned long cr0,
1634 struct kvm_vcpu *vcpu)
1635 {
1636 if (!(cr0 & X86_CR0_PG)) {
1637 /* From paging/starting to nonpaging */
1638 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
1639 vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) |
1640 (CPU_BASED_CR3_LOAD_EXITING |
1641 CPU_BASED_CR3_STORE_EXITING));
1642 vcpu->arch.cr0 = cr0;
1643 vmx_set_cr4(vcpu, vcpu->arch.cr4);
1644 } else if (!is_paging(vcpu)) {
1645 /* From nonpaging to paging */
1646 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
1647 vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) &
1648 ~(CPU_BASED_CR3_LOAD_EXITING |
1649 CPU_BASED_CR3_STORE_EXITING));
1650 vcpu->arch.cr0 = cr0;
1651 vmx_set_cr4(vcpu, vcpu->arch.cr4);
1652 }
1653
1654 if (!(cr0 & X86_CR0_WP))
1655 *hw_cr0 &= ~X86_CR0_WP;
1656 }
1657
1658 static void ept_update_paging_mode_cr4(unsigned long *hw_cr4,
1659 struct kvm_vcpu *vcpu)
1660 {
1661 if (!is_paging(vcpu)) {
1662 *hw_cr4 &= ~X86_CR4_PAE;
1663 *hw_cr4 |= X86_CR4_PSE;
1664 } else if (!(vcpu->arch.cr4 & X86_CR4_PAE))
1665 *hw_cr4 &= ~X86_CR4_PAE;
1666 }
1667
1668 static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
1669 {
1670 struct vcpu_vmx *vmx = to_vmx(vcpu);
1671 unsigned long hw_cr0;
1672
1673 if (enable_unrestricted_guest)
1674 hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST)
1675 | KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST;
1676 else
1677 hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON;
1678
1679 vmx_fpu_deactivate(vcpu);
1680
1681 if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE))
1682 enter_pmode(vcpu);
1683
1684 if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE))
1685 enter_rmode(vcpu);
1686
1687 #ifdef CONFIG_X86_64
1688 if (vcpu->arch.shadow_efer & EFER_LME) {
1689 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
1690 enter_lmode(vcpu);
1691 if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
1692 exit_lmode(vcpu);
1693 }
1694 #endif
1695
1696 if (enable_ept)
1697 ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu);
1698
1699 vmcs_writel(CR0_READ_SHADOW, cr0);
1700 vmcs_writel(GUEST_CR0, hw_cr0);
1701 vcpu->arch.cr0 = cr0;
1702
1703 if (!(cr0 & X86_CR0_TS) || !(cr0 & X86_CR0_PE))
1704 vmx_fpu_activate(vcpu);
1705 }
1706
1707 static u64 construct_eptp(unsigned long root_hpa)
1708 {
1709 u64 eptp;
1710
1711 /* TODO write the value reading from MSR */
1712 eptp = VMX_EPT_DEFAULT_MT |
1713 VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
1714 eptp |= (root_hpa & PAGE_MASK);
1715
1716 return eptp;
1717 }
1718
1719 static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
1720 {
1721 unsigned long guest_cr3;
1722 u64 eptp;
1723
1724 guest_cr3 = cr3;
1725 if (enable_ept) {
1726 eptp = construct_eptp(cr3);
1727 vmcs_write64(EPT_POINTER, eptp);
1728 guest_cr3 = is_paging(vcpu) ? vcpu->arch.cr3 :
1729 vcpu->kvm->arch.ept_identity_map_addr;
1730 }
1731
1732 vmx_flush_tlb(vcpu);
1733 vmcs_writel(GUEST_CR3, guest_cr3);
1734 if (vcpu->arch.cr0 & X86_CR0_PE)
1735 vmx_fpu_deactivate(vcpu);
1736 }
1737
1738 static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
1739 {
1740 unsigned long hw_cr4 = cr4 | (to_vmx(vcpu)->rmode.vm86_active ?
1741 KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON);
1742
1743 vcpu->arch.cr4 = cr4;
1744 if (enable_ept)
1745 ept_update_paging_mode_cr4(&hw_cr4, vcpu);
1746
1747 vmcs_writel(CR4_READ_SHADOW, cr4);
1748 vmcs_writel(GUEST_CR4, hw_cr4);
1749 }
1750
1751 static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
1752 {
1753 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1754
1755 return vmcs_readl(sf->base);
1756 }
1757
1758 static void vmx_get_segment(struct kvm_vcpu *vcpu,
1759 struct kvm_segment *var, int seg)
1760 {
1761 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1762 u32 ar;
1763
1764 var->base = vmcs_readl(sf->base);
1765 var->limit = vmcs_read32(sf->limit);
1766 var->selector = vmcs_read16(sf->selector);
1767 ar = vmcs_read32(sf->ar_bytes);
1768 if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state)
1769 ar = 0;
1770 var->type = ar & 15;
1771 var->s = (ar >> 4) & 1;
1772 var->dpl = (ar >> 5) & 3;
1773 var->present = (ar >> 7) & 1;
1774 var->avl = (ar >> 12) & 1;
1775 var->l = (ar >> 13) & 1;
1776 var->db = (ar >> 14) & 1;
1777 var->g = (ar >> 15) & 1;
1778 var->unusable = (ar >> 16) & 1;
1779 }
1780
1781 static int vmx_get_cpl(struct kvm_vcpu *vcpu)
1782 {
1783 if (!(vcpu->arch.cr0 & X86_CR0_PE)) /* if real mode */
1784 return 0;
1785
1786 if (vmx_get_rflags(vcpu) & X86_EFLAGS_VM) /* if virtual 8086 */
1787 return 3;
1788
1789 return vmcs_read16(GUEST_CS_SELECTOR) & 3;
1790 }
1791
1792 static u32 vmx_segment_access_rights(struct kvm_segment *var)
1793 {
1794 u32 ar;
1795
1796 if (var->unusable)
1797 ar = 1 << 16;
1798 else {
1799 ar = var->type & 15;
1800 ar |= (var->s & 1) << 4;
1801 ar |= (var->dpl & 3) << 5;
1802 ar |= (var->present & 1) << 7;
1803 ar |= (var->avl & 1) << 12;
1804 ar |= (var->l & 1) << 13;
1805 ar |= (var->db & 1) << 14;
1806 ar |= (var->g & 1) << 15;
1807 }
1808 if (ar == 0) /* a 0 value means unusable */
1809 ar = AR_UNUSABLE_MASK;
1810
1811 return ar;
1812 }
1813
1814 static void vmx_set_segment(struct kvm_vcpu *vcpu,
1815 struct kvm_segment *var, int seg)
1816 {
1817 struct vcpu_vmx *vmx = to_vmx(vcpu);
1818 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1819 u32 ar;
1820
1821 if (vmx->rmode.vm86_active && seg == VCPU_SREG_TR) {
1822 vmx->rmode.tr.selector = var->selector;
1823 vmx->rmode.tr.base = var->base;
1824 vmx->rmode.tr.limit = var->limit;
1825 vmx->rmode.tr.ar = vmx_segment_access_rights(var);
1826 return;
1827 }
1828 vmcs_writel(sf->base, var->base);
1829 vmcs_write32(sf->limit, var->limit);
1830 vmcs_write16(sf->selector, var->selector);
1831 if (vmx->rmode.vm86_active && var->s) {
1832 /*
1833 * Hack real-mode segments into vm86 compatibility.
1834 */
1835 if (var->base == 0xffff0000 && var->selector == 0xf000)
1836 vmcs_writel(sf->base, 0xf0000);
1837 ar = 0xf3;
1838 } else
1839 ar = vmx_segment_access_rights(var);
1840
1841 /*
1842 * Fix the "Accessed" bit in AR field of segment registers for older
1843 * qemu binaries.
1844 * IA32 arch specifies that at the time of processor reset the
1845 * "Accessed" bit in the AR field of segment registers is 1. And qemu
1846 * is setting it to 0 in the usedland code. This causes invalid guest
1847 * state vmexit when "unrestricted guest" mode is turned on.
1848 * Fix for this setup issue in cpu_reset is being pushed in the qemu
1849 * tree. Newer qemu binaries with that qemu fix would not need this
1850 * kvm hack.
1851 */
1852 if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR))
1853 ar |= 0x1; /* Accessed */
1854
1855 vmcs_write32(sf->ar_bytes, ar);
1856 }
1857
1858 static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
1859 {
1860 u32 ar = vmcs_read32(GUEST_CS_AR_BYTES);
1861
1862 *db = (ar >> 14) & 1;
1863 *l = (ar >> 13) & 1;
1864 }
1865
1866 static void vmx_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1867 {
1868 dt->limit = vmcs_read32(GUEST_IDTR_LIMIT);
1869 dt->base = vmcs_readl(GUEST_IDTR_BASE);
1870 }
1871
1872 static void vmx_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1873 {
1874 vmcs_write32(GUEST_IDTR_LIMIT, dt->limit);
1875 vmcs_writel(GUEST_IDTR_BASE, dt->base);
1876 }
1877
1878 static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1879 {
1880 dt->limit = vmcs_read32(GUEST_GDTR_LIMIT);
1881 dt->base = vmcs_readl(GUEST_GDTR_BASE);
1882 }
1883
1884 static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1885 {
1886 vmcs_write32(GUEST_GDTR_LIMIT, dt->limit);
1887 vmcs_writel(GUEST_GDTR_BASE, dt->base);
1888 }
1889
1890 static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
1891 {
1892 struct kvm_segment var;
1893 u32 ar;
1894
1895 vmx_get_segment(vcpu, &var, seg);
1896 ar = vmx_segment_access_rights(&var);
1897
1898 if (var.base != (var.selector << 4))
1899 return false;
1900 if (var.limit != 0xffff)
1901 return false;
1902 if (ar != 0xf3)
1903 return false;
1904
1905 return true;
1906 }
1907
1908 static bool code_segment_valid(struct kvm_vcpu *vcpu)
1909 {
1910 struct kvm_segment cs;
1911 unsigned int cs_rpl;
1912
1913 vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
1914 cs_rpl = cs.selector & SELECTOR_RPL_MASK;
1915
1916 if (cs.unusable)
1917 return false;
1918 if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK))
1919 return false;
1920 if (!cs.s)
1921 return false;
1922 if (cs.type & AR_TYPE_WRITEABLE_MASK) {
1923 if (cs.dpl > cs_rpl)
1924 return false;
1925 } else {
1926 if (cs.dpl != cs_rpl)
1927 return false;
1928 }
1929 if (!cs.present)
1930 return false;
1931
1932 /* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */
1933 return true;
1934 }
1935
1936 static bool stack_segment_valid(struct kvm_vcpu *vcpu)
1937 {
1938 struct kvm_segment ss;
1939 unsigned int ss_rpl;
1940
1941 vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
1942 ss_rpl = ss.selector & SELECTOR_RPL_MASK;
1943
1944 if (ss.unusable)
1945 return true;
1946 if (ss.type != 3 && ss.type != 7)
1947 return false;
1948 if (!ss.s)
1949 return false;
1950 if (ss.dpl != ss_rpl) /* DPL != RPL */
1951 return false;
1952 if (!ss.present)
1953 return false;
1954
1955 return true;
1956 }
1957
1958 static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg)
1959 {
1960 struct kvm_segment var;
1961 unsigned int rpl;
1962
1963 vmx_get_segment(vcpu, &var, seg);
1964 rpl = var.selector & SELECTOR_RPL_MASK;
1965
1966 if (var.unusable)
1967 return true;
1968 if (!var.s)
1969 return false;
1970 if (!var.present)
1971 return false;
1972 if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) {
1973 if (var.dpl < rpl) /* DPL < RPL */
1974 return false;
1975 }
1976
1977 /* TODO: Add other members to kvm_segment_field to allow checking for other access
1978 * rights flags
1979 */
1980 return true;
1981 }
1982
1983 static bool tr_valid(struct kvm_vcpu *vcpu)
1984 {
1985 struct kvm_segment tr;
1986
1987 vmx_get_segment(vcpu, &tr, VCPU_SREG_TR);
1988
1989 if (tr.unusable)
1990 return false;
1991 if (tr.selector & SELECTOR_TI_MASK) /* TI = 1 */
1992 return false;
1993 if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */
1994 return false;
1995 if (!tr.present)
1996 return false;
1997
1998 return true;
1999 }
2000
2001 static bool ldtr_valid(struct kvm_vcpu *vcpu)
2002 {
2003 struct kvm_segment ldtr;
2004
2005 vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR);
2006
2007 if (ldtr.unusable)
2008 return true;
2009 if (ldtr.selector & SELECTOR_TI_MASK) /* TI = 1 */
2010 return false;
2011 if (ldtr.type != 2)
2012 return false;
2013 if (!ldtr.present)
2014 return false;
2015
2016 return true;
2017 }
2018
2019 static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu)
2020 {
2021 struct kvm_segment cs, ss;
2022
2023 vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
2024 vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
2025
2026 return ((cs.selector & SELECTOR_RPL_MASK) ==
2027 (ss.selector & SELECTOR_RPL_MASK));
2028 }
2029
2030 /*
2031 * Check if guest state is valid. Returns true if valid, false if
2032 * not.
2033 * We assume that registers are always usable
2034 */
2035 static bool guest_state_valid(struct kvm_vcpu *vcpu)
2036 {
2037 /* real mode guest state checks */
2038 if (!(vcpu->arch.cr0 & X86_CR0_PE)) {
2039 if (!rmode_segment_valid(vcpu, VCPU_SREG_CS))
2040 return false;
2041 if (!rmode_segment_valid(vcpu, VCPU_SREG_SS))
2042 return false;
2043 if (!rmode_segment_valid(vcpu, VCPU_SREG_DS))
2044 return false;
2045 if (!rmode_segment_valid(vcpu, VCPU_SREG_ES))
2046 return false;
2047 if (!rmode_segment_valid(vcpu, VCPU_SREG_FS))
2048 return false;
2049 if (!rmode_segment_valid(vcpu, VCPU_SREG_GS))
2050 return false;
2051 } else {
2052 /* protected mode guest state checks */
2053 if (!cs_ss_rpl_check(vcpu))
2054 return false;
2055 if (!code_segment_valid(vcpu))
2056 return false;
2057 if (!stack_segment_valid(vcpu))
2058 return false;
2059 if (!data_segment_valid(vcpu, VCPU_SREG_DS))
2060 return false;
2061 if (!data_segment_valid(vcpu, VCPU_SREG_ES))
2062 return false;
2063 if (!data_segment_valid(vcpu, VCPU_SREG_FS))
2064 return false;
2065 if (!data_segment_valid(vcpu, VCPU_SREG_GS))
2066 return false;
2067 if (!tr_valid(vcpu))
2068 return false;
2069 if (!ldtr_valid(vcpu))
2070 return false;
2071 }
2072 /* TODO:
2073 * - Add checks on RIP
2074 * - Add checks on RFLAGS
2075 */
2076
2077 return true;
2078 }
2079
2080 static int init_rmode_tss(struct kvm *kvm)
2081 {
2082 gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
2083 u16 data = 0;
2084 int ret = 0;
2085 int r;
2086
2087 r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
2088 if (r < 0)
2089 goto out;
2090 data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
2091 r = kvm_write_guest_page(kvm, fn++, &data,
2092 TSS_IOPB_BASE_OFFSET, sizeof(u16));
2093 if (r < 0)
2094 goto out;
2095 r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE);
2096 if (r < 0)
2097 goto out;
2098 r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
2099 if (r < 0)
2100 goto out;
2101 data = ~0;
2102 r = kvm_write_guest_page(kvm, fn, &data,
2103 RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1,
2104 sizeof(u8));
2105 if (r < 0)
2106 goto out;
2107
2108 ret = 1;
2109 out:
2110 return ret;
2111 }
2112
2113 static int init_rmode_identity_map(struct kvm *kvm)
2114 {
2115 int i, r, ret;
2116 pfn_t identity_map_pfn;
2117 u32 tmp;
2118
2119 if (!enable_ept)
2120 return 1;
2121 if (unlikely(!kvm->arch.ept_identity_pagetable)) {
2122 printk(KERN_ERR "EPT: identity-mapping pagetable "
2123 "haven't been allocated!\n");
2124 return 0;
2125 }
2126 if (likely(kvm->arch.ept_identity_pagetable_done))
2127 return 1;
2128 ret = 0;
2129 identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT;
2130 r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE);
2131 if (r < 0)
2132 goto out;
2133 /* Set up identity-mapping pagetable for EPT in real mode */
2134 for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
2135 tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
2136 _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
2137 r = kvm_write_guest_page(kvm, identity_map_pfn,
2138 &tmp, i * sizeof(tmp), sizeof(tmp));
2139 if (r < 0)
2140 goto out;
2141 }
2142 kvm->arch.ept_identity_pagetable_done = true;
2143 ret = 1;
2144 out:
2145 return ret;
2146 }
2147
2148 static void seg_setup(int seg)
2149 {
2150 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
2151 unsigned int ar;
2152
2153 vmcs_write16(sf->selector, 0);
2154 vmcs_writel(sf->base, 0);
2155 vmcs_write32(sf->limit, 0xffff);
2156 if (enable_unrestricted_guest) {
2157 ar = 0x93;
2158 if (seg == VCPU_SREG_CS)
2159 ar |= 0x08; /* code segment */
2160 } else
2161 ar = 0xf3;
2162
2163 vmcs_write32(sf->ar_bytes, ar);
2164 }
2165
2166 static int alloc_apic_access_page(struct kvm *kvm)
2167 {
2168 struct kvm_userspace_memory_region kvm_userspace_mem;
2169 int r = 0;
2170
2171 down_write(&kvm->slots_lock);
2172 if (kvm->arch.apic_access_page)
2173 goto out;
2174 kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
2175 kvm_userspace_mem.flags = 0;
2176 kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL;
2177 kvm_userspace_mem.memory_size = PAGE_SIZE;
2178 r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
2179 if (r)
2180 goto out;
2181
2182 kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
2183 out:
2184 up_write(&kvm->slots_lock);
2185 return r;
2186 }
2187
2188 static int alloc_identity_pagetable(struct kvm *kvm)
2189 {
2190 struct kvm_userspace_memory_region kvm_userspace_mem;
2191 int r = 0;
2192
2193 down_write(&kvm->slots_lock);
2194 if (kvm->arch.ept_identity_pagetable)
2195 goto out;
2196 kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
2197 kvm_userspace_mem.flags = 0;
2198 kvm_userspace_mem.guest_phys_addr =
2199 kvm->arch.ept_identity_map_addr;
2200 kvm_userspace_mem.memory_size = PAGE_SIZE;
2201 r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
2202 if (r)
2203 goto out;
2204
2205 kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
2206 kvm->arch.ept_identity_map_addr >> PAGE_SHIFT);
2207 out:
2208 up_write(&kvm->slots_lock);
2209 return r;
2210 }
2211
2212 static void allocate_vpid(struct vcpu_vmx *vmx)
2213 {
2214 int vpid;
2215
2216 vmx->vpid = 0;
2217 if (!enable_vpid)
2218 return;
2219 spin_lock(&vmx_vpid_lock);
2220 vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS);
2221 if (vpid < VMX_NR_VPIDS) {
2222 vmx->vpid = vpid;
2223 __set_bit(vpid, vmx_vpid_bitmap);
2224 }
2225 spin_unlock(&vmx_vpid_lock);
2226 }
2227
2228 static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr)
2229 {
2230 int f = sizeof(unsigned long);
2231
2232 if (!cpu_has_vmx_msr_bitmap())
2233 return;
2234
2235 /*
2236 * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals
2237 * have the write-low and read-high bitmap offsets the wrong way round.
2238 * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff.
2239 */
2240 if (msr <= 0x1fff) {
2241 __clear_bit(msr, msr_bitmap + 0x000 / f); /* read-low */
2242 __clear_bit(msr, msr_bitmap + 0x800 / f); /* write-low */
2243 } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
2244 msr &= 0x1fff;
2245 __clear_bit(msr, msr_bitmap + 0x400 / f); /* read-high */
2246 __clear_bit(msr, msr_bitmap + 0xc00 / f); /* write-high */
2247 }
2248 }
2249
2250 static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only)
2251 {
2252 if (!longmode_only)
2253 __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy, msr);
2254 __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode, msr);
2255 }
2256
2257 /*
2258 * Sets up the vmcs for emulated real mode.
2259 */
2260 static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
2261 {
2262 u32 host_sysenter_cs, msr_low, msr_high;
2263 u32 junk;
2264 u64 host_pat, tsc_this, tsc_base;
2265 unsigned long a;
2266 struct descriptor_table dt;
2267 int i;
2268 unsigned long kvm_vmx_return;
2269 u32 exec_control;
2270
2271 /* I/O */
2272 vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a));
2273 vmcs_write64(IO_BITMAP_B, __pa(vmx_io_bitmap_b));
2274
2275 if (cpu_has_vmx_msr_bitmap())
2276 vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap_legacy));
2277
2278 vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
2279
2280 /* Control */
2281 vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
2282 vmcs_config.pin_based_exec_ctrl);
2283
2284 exec_control = vmcs_config.cpu_based_exec_ctrl;
2285 if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) {
2286 exec_control &= ~CPU_BASED_TPR_SHADOW;
2287 #ifdef CONFIG_X86_64
2288 exec_control |= CPU_BASED_CR8_STORE_EXITING |
2289 CPU_BASED_CR8_LOAD_EXITING;
2290 #endif
2291 }
2292 if (!enable_ept)
2293 exec_control |= CPU_BASED_CR3_STORE_EXITING |
2294 CPU_BASED_CR3_LOAD_EXITING |
2295 CPU_BASED_INVLPG_EXITING;
2296 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
2297
2298 if (cpu_has_secondary_exec_ctrls()) {
2299 exec_control = vmcs_config.cpu_based_2nd_exec_ctrl;
2300 if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
2301 exec_control &=
2302 ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
2303 if (vmx->vpid == 0)
2304 exec_control &= ~SECONDARY_EXEC_ENABLE_VPID;
2305 if (!enable_ept)
2306 exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
2307 if (!enable_unrestricted_guest)
2308 exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
2309 vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
2310 }
2311
2312 vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, !!bypass_guest_pf);
2313 vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, !!bypass_guest_pf);
2314 vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */
2315
2316 vmcs_writel(HOST_CR0, read_cr0()); /* 22.2.3 */
2317 vmcs_writel(HOST_CR4, read_cr4()); /* 22.2.3, 22.2.5 */
2318 vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */
2319
2320 vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */
2321 vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
2322 vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS); /* 22.2.4 */
2323 vmcs_write16(HOST_FS_SELECTOR, kvm_read_fs()); /* 22.2.4 */
2324 vmcs_write16(HOST_GS_SELECTOR, kvm_read_gs()); /* 22.2.4 */
2325 vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
2326 #ifdef CONFIG_X86_64
2327 rdmsrl(MSR_FS_BASE, a);
2328 vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
2329 rdmsrl(MSR_GS_BASE, a);
2330 vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
2331 #else
2332 vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
2333 vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
2334 #endif
2335
2336 vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */
2337
2338 kvm_get_idt(&dt);
2339 vmcs_writel(HOST_IDTR_BASE, dt.base); /* 22.2.4 */
2340
2341 asm("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return));
2342 vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */
2343 vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
2344 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
2345 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
2346
2347 rdmsr(MSR_IA32_SYSENTER_CS, host_sysenter_cs, junk);
2348 vmcs_write32(HOST_IA32_SYSENTER_CS, host_sysenter_cs);
2349 rdmsrl(MSR_IA32_SYSENTER_ESP, a);
2350 vmcs_writel(HOST_IA32_SYSENTER_ESP, a); /* 22.2.3 */
2351 rdmsrl(MSR_IA32_SYSENTER_EIP, a);
2352 vmcs_writel(HOST_IA32_SYSENTER_EIP, a); /* 22.2.3 */
2353
2354 if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) {
2355 rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
2356 host_pat = msr_low | ((u64) msr_high << 32);
2357 vmcs_write64(HOST_IA32_PAT, host_pat);
2358 }
2359 if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
2360 rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
2361 host_pat = msr_low | ((u64) msr_high << 32);
2362 /* Write the default value follow host pat */
2363 vmcs_write64(GUEST_IA32_PAT, host_pat);
2364 /* Keep arch.pat sync with GUEST_IA32_PAT */
2365 vmx->vcpu.arch.pat = host_pat;
2366 }
2367
2368 for (i = 0; i < NR_VMX_MSR; ++i) {
2369 u32 index = vmx_msr_index[i];
2370 u32 data_low, data_high;
2371 u64 data;
2372 int j = vmx->nmsrs;
2373
2374 if (rdmsr_safe(index, &data_low, &data_high) < 0)
2375 continue;
2376 if (wrmsr_safe(index, data_low, data_high) < 0)
2377 continue;
2378 data = data_low | ((u64)data_high << 32);
2379 vmx->host_msrs[j].index = index;
2380 vmx->host_msrs[j].reserved = 0;
2381 vmx->host_msrs[j].data = data;
2382 vmx->guest_msrs[j] = vmx->host_msrs[j];
2383 ++vmx->nmsrs;
2384 }
2385
2386 vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
2387
2388 /* 22.2.1, 20.8.1 */
2389 vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);
2390
2391 vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
2392 vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK);
2393
2394 tsc_base = vmx->vcpu.kvm->arch.vm_init_tsc;
2395 rdtscll(tsc_this);
2396 if (tsc_this < vmx->vcpu.kvm->arch.vm_init_tsc)
2397 tsc_base = tsc_this;
2398
2399 guest_write_tsc(0, tsc_base);
2400
2401 return 0;
2402 }
2403
2404 static int init_rmode(struct kvm *kvm)
2405 {
2406 if (!init_rmode_tss(kvm))
2407 return 0;
2408 if (!init_rmode_identity_map(kvm))
2409 return 0;
2410 return 1;
2411 }
2412
2413 static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
2414 {
2415 struct vcpu_vmx *vmx = to_vmx(vcpu);
2416 u64 msr;
2417 int ret;
2418
2419 vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
2420 down_read(&vcpu->kvm->slots_lock);
2421 if (!init_rmode(vmx->vcpu.kvm)) {
2422 ret = -ENOMEM;
2423 goto out;
2424 }
2425
2426 vmx->rmode.vm86_active = 0;
2427
2428 vmx->soft_vnmi_blocked = 0;
2429
2430 vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
2431 kvm_set_cr8(&vmx->vcpu, 0);
2432 msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
2433 if (kvm_vcpu_is_bsp(&vmx->vcpu))
2434 msr |= MSR_IA32_APICBASE_BSP;
2435 kvm_set_apic_base(&vmx->vcpu, msr);
2436
2437 fx_init(&vmx->vcpu);
2438
2439 seg_setup(VCPU_SREG_CS);
2440 /*
2441 * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
2442 * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4. Sigh.
2443 */
2444 if (kvm_vcpu_is_bsp(&vmx->vcpu)) {
2445 vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
2446 vmcs_writel(GUEST_CS_BASE, 0x000f0000);
2447 } else {
2448 vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8);
2449 vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12);
2450 }
2451
2452 seg_setup(VCPU_SREG_DS);
2453 seg_setup(VCPU_SREG_ES);
2454 seg_setup(VCPU_SREG_FS);
2455 seg_setup(VCPU_SREG_GS);
2456 seg_setup(VCPU_SREG_SS);
2457
2458 vmcs_write16(GUEST_TR_SELECTOR, 0);
2459 vmcs_writel(GUEST_TR_BASE, 0);
2460 vmcs_write32(GUEST_TR_LIMIT, 0xffff);
2461 vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
2462
2463 vmcs_write16(GUEST_LDTR_SELECTOR, 0);
2464 vmcs_writel(GUEST_LDTR_BASE, 0);
2465 vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
2466 vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);
2467
2468 vmcs_write32(GUEST_SYSENTER_CS, 0);
2469 vmcs_writel(GUEST_SYSENTER_ESP, 0);
2470 vmcs_writel(GUEST_SYSENTER_EIP, 0);
2471
2472 vmcs_writel(GUEST_RFLAGS, 0x02);
2473 if (kvm_vcpu_is_bsp(&vmx->vcpu))
2474 kvm_rip_write(vcpu, 0xfff0);
2475 else
2476 kvm_rip_write(vcpu, 0);
2477 kvm_register_write(vcpu, VCPU_REGS_RSP, 0);
2478
2479 vmcs_writel(GUEST_DR7, 0x400);
2480
2481 vmcs_writel(GUEST_GDTR_BASE, 0);
2482 vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);
2483
2484 vmcs_writel(GUEST_IDTR_BASE, 0);
2485 vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);
2486
2487 vmcs_write32(GUEST_ACTIVITY_STATE, 0);
2488 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
2489 vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);
2490
2491 /* Special registers */
2492 vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
2493
2494 setup_msrs(vmx);
2495
2496 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */
2497
2498 if (cpu_has_vmx_tpr_shadow()) {
2499 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0);
2500 if (vm_need_tpr_shadow(vmx->vcpu.kvm))
2501 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR,
2502 page_to_phys(vmx->vcpu.arch.apic->regs_page));
2503 vmcs_write32(TPR_THRESHOLD, 0);
2504 }
2505
2506 if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
2507 vmcs_write64(APIC_ACCESS_ADDR,
2508 page_to_phys(vmx->vcpu.kvm->arch.apic_access_page));
2509
2510 if (vmx->vpid != 0)
2511 vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
2512
2513 vmx->vcpu.arch.cr0 = 0x60000010;
2514 vmx_set_cr0(&vmx->vcpu, vmx->vcpu.arch.cr0); /* enter rmode */
2515 vmx_set_cr4(&vmx->vcpu, 0);
2516 vmx_set_efer(&vmx->vcpu, 0);
2517 vmx_fpu_activate(&vmx->vcpu);
2518 update_exception_bitmap(&vmx->vcpu);
2519
2520 vpid_sync_vcpu_all(vmx);
2521
2522 ret = 0;
2523
2524 /* HACK: Don't enable emulation on guest boot/reset */
2525 vmx->emulation_required = 0;
2526
2527 out:
2528 up_read(&vcpu->kvm->slots_lock);
2529 return ret;
2530 }
2531
2532 static void enable_irq_window(struct kvm_vcpu *vcpu)
2533 {
2534 u32 cpu_based_vm_exec_control;
2535
2536 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
2537 cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
2538 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
2539 }
2540
2541 static void enable_nmi_window(struct kvm_vcpu *vcpu)
2542 {
2543 u32 cpu_based_vm_exec_control;
2544
2545 if (!cpu_has_virtual_nmis()) {
2546 enable_irq_window(vcpu);
2547 return;
2548 }
2549
2550 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
2551 cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING;
2552 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
2553 }
2554
2555 static void vmx_inject_irq(struct kvm_vcpu *vcpu)
2556 {
2557 struct vcpu_vmx *vmx = to_vmx(vcpu);
2558 uint32_t intr;
2559 int irq = vcpu->arch.interrupt.nr;
2560
2561 trace_kvm_inj_virq(irq);
2562
2563 ++vcpu->stat.irq_injections;
2564 if (vmx->rmode.vm86_active) {
2565 vmx->rmode.irq.pending = true;
2566 vmx->rmode.irq.vector = irq;
2567 vmx->rmode.irq.rip = kvm_rip_read(vcpu);
2568 if (vcpu->arch.interrupt.soft)
2569 vmx->rmode.irq.rip +=
2570 vmx->vcpu.arch.event_exit_inst_len;
2571 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2572 irq | INTR_TYPE_SOFT_INTR | INTR_INFO_VALID_MASK);
2573 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
2574 kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
2575 return;
2576 }
2577 intr = irq | INTR_INFO_VALID_MASK;
2578 if (vcpu->arch.interrupt.soft) {
2579 intr |= INTR_TYPE_SOFT_INTR;
2580 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
2581 vmx->vcpu.arch.event_exit_inst_len);
2582 } else
2583 intr |= INTR_TYPE_EXT_INTR;
2584 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr);
2585 }
2586
2587 static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
2588 {
2589 struct vcpu_vmx *vmx = to_vmx(vcpu);
2590
2591 if (!cpu_has_virtual_nmis()) {
2592 /*
2593 * Tracking the NMI-blocked state in software is built upon
2594 * finding the next open IRQ window. This, in turn, depends on
2595 * well-behaving guests: They have to keep IRQs disabled at
2596 * least as long as the NMI handler runs. Otherwise we may
2597 * cause NMI nesting, maybe breaking the guest. But as this is
2598 * highly unlikely, we can live with the residual risk.
2599 */
2600 vmx->soft_vnmi_blocked = 1;
2601 vmx->vnmi_blocked_time = 0;
2602 }
2603
2604 ++vcpu->stat.nmi_injections;
2605 if (vmx->rmode.vm86_active) {
2606 vmx->rmode.irq.pending = true;
2607 vmx->rmode.irq.vector = NMI_VECTOR;
2608 vmx->rmode.irq.rip = kvm_rip_read(vcpu);
2609 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2610 NMI_VECTOR | INTR_TYPE_SOFT_INTR |
2611 INTR_INFO_VALID_MASK);
2612 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
2613 kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
2614 return;
2615 }
2616 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2617 INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR);
2618 }
2619
2620 static int vmx_nmi_allowed(struct kvm_vcpu *vcpu)
2621 {
2622 if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked)
2623 return 0;
2624
2625 return !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
2626 (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS |
2627 GUEST_INTR_STATE_NMI));
2628 }
2629
2630 static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
2631 {
2632 return (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
2633 !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
2634 (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS));
2635 }
2636
2637 static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
2638 {
2639 int ret;
2640 struct kvm_userspace_memory_region tss_mem = {
2641 .slot = TSS_PRIVATE_MEMSLOT,
2642 .guest_phys_addr = addr,
2643 .memory_size = PAGE_SIZE * 3,
2644 .flags = 0,
2645 };
2646
2647 ret = kvm_set_memory_region(kvm, &tss_mem, 0);
2648 if (ret)
2649 return ret;
2650 kvm->arch.tss_addr = addr;
2651 return 0;
2652 }
2653
2654 static int handle_rmode_exception(struct kvm_vcpu *vcpu,
2655 int vec, u32 err_code)
2656 {
2657 /*
2658 * Instruction with address size override prefix opcode 0x67
2659 * Cause the #SS fault with 0 error code in VM86 mode.
2660 */
2661 if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
2662 if (emulate_instruction(vcpu, NULL, 0, 0, 0) == EMULATE_DONE)
2663 return 1;
2664 /*
2665 * Forward all other exceptions that are valid in real mode.
2666 * FIXME: Breaks guest debugging in real mode, needs to be fixed with
2667 * the required debugging infrastructure rework.
2668 */
2669 switch (vec) {
2670 case DB_VECTOR:
2671 if (vcpu->guest_debug &
2672 (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
2673 return 0;
2674 kvm_queue_exception(vcpu, vec);
2675 return 1;
2676 case BP_VECTOR:
2677 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
2678 return 0;
2679 /* fall through */
2680 case DE_VECTOR:
2681 case OF_VECTOR:
2682 case BR_VECTOR:
2683 case UD_VECTOR:
2684 case DF_VECTOR:
2685 case SS_VECTOR:
2686 case GP_VECTOR:
2687 case MF_VECTOR:
2688 kvm_queue_exception(vcpu, vec);
2689 return 1;
2690 }
2691 return 0;
2692 }
2693
2694 /*
2695 * Trigger machine check on the host. We assume all the MSRs are already set up
2696 * by the CPU and that we still run on the same CPU as the MCE occurred on.
2697 * We pass a fake environment to the machine check handler because we want
2698 * the guest to be always treated like user space, no matter what context
2699 * it used internally.
2700 */
2701 static void kvm_machine_check(void)
2702 {
2703 #if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64)
2704 struct pt_regs regs = {
2705 .cs = 3, /* Fake ring 3 no matter what the guest ran on */
2706 .flags = X86_EFLAGS_IF,
2707 };
2708
2709 do_machine_check(&regs, 0);
2710 #endif
2711 }
2712
2713 static int handle_machine_check(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2714 {
2715 /* already handled by vcpu_run */
2716 return 1;
2717 }
2718
2719 static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2720 {
2721 struct vcpu_vmx *vmx = to_vmx(vcpu);
2722 u32 intr_info, ex_no, error_code;
2723 unsigned long cr2, rip, dr6;
2724 u32 vect_info;
2725 enum emulation_result er;
2726
2727 vect_info = vmx->idt_vectoring_info;
2728 intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
2729
2730 if (is_machine_check(intr_info))
2731 return handle_machine_check(vcpu, kvm_run);
2732
2733 if ((vect_info & VECTORING_INFO_VALID_MASK) &&
2734 !is_page_fault(intr_info))
2735 printk(KERN_ERR "%s: unexpected, vectoring info 0x%x "
2736 "intr info 0x%x\n", __func__, vect_info, intr_info);
2737
2738 if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR)
2739 return 1; /* already handled by vmx_vcpu_run() */
2740
2741 if (is_no_device(intr_info)) {
2742 vmx_fpu_activate(vcpu);
2743 return 1;
2744 }
2745
2746 if (is_invalid_opcode(intr_info)) {
2747 er = emulate_instruction(vcpu, kvm_run, 0, 0, EMULTYPE_TRAP_UD);
2748 if (er != EMULATE_DONE)
2749 kvm_queue_exception(vcpu, UD_VECTOR);
2750 return 1;
2751 }
2752
2753 error_code = 0;
2754 rip = kvm_rip_read(vcpu);
2755 if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
2756 error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
2757 if (is_page_fault(intr_info)) {
2758 /* EPT won't cause page fault directly */
2759 if (enable_ept)
2760 BUG();
2761 cr2 = vmcs_readl(EXIT_QUALIFICATION);
2762 trace_kvm_page_fault(cr2, error_code);
2763
2764 if (kvm_event_needs_reinjection(vcpu))
2765 kvm_mmu_unprotect_page_virt(vcpu, cr2);
2766 return kvm_mmu_page_fault(vcpu, cr2, error_code);
2767 }
2768
2769 if (vmx->rmode.vm86_active &&
2770 handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
2771 error_code)) {
2772 if (vcpu->arch.halt_request) {
2773 vcpu->arch.halt_request = 0;
2774 return kvm_emulate_halt(vcpu);
2775 }
2776 return 1;
2777 }
2778
2779 ex_no = intr_info & INTR_INFO_VECTOR_MASK;
2780 switch (ex_no) {
2781 case DB_VECTOR:
2782 dr6 = vmcs_readl(EXIT_QUALIFICATION);
2783 if (!(vcpu->guest_debug &
2784 (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
2785 vcpu->arch.dr6 = dr6 | DR6_FIXED_1;
2786 kvm_queue_exception(vcpu, DB_VECTOR);
2787 return 1;
2788 }
2789 kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1;
2790 kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7);
2791 /* fall through */
2792 case BP_VECTOR:
2793 kvm_run->exit_reason = KVM_EXIT_DEBUG;
2794 kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip;
2795 kvm_run->debug.arch.exception = ex_no;
2796 break;
2797 default:
2798 kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
2799 kvm_run->ex.exception = ex_no;
2800 kvm_run->ex.error_code = error_code;
2801 break;
2802 }
2803 return 0;
2804 }
2805
2806 static int handle_external_interrupt(struct kvm_vcpu *vcpu,
2807 struct kvm_run *kvm_run)
2808 {
2809 ++vcpu->stat.irq_exits;
2810 return 1;
2811 }
2812
2813 static int handle_triple_fault(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2814 {
2815 kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
2816 return 0;
2817 }
2818
2819 static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2820 {
2821 unsigned long exit_qualification;
2822 int size, in, string;
2823 unsigned port;
2824
2825 ++vcpu->stat.io_exits;
2826 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2827 string = (exit_qualification & 16) != 0;
2828
2829 if (string) {
2830 if (emulate_instruction(vcpu,
2831 kvm_run, 0, 0, 0) == EMULATE_DO_MMIO)
2832 return 0;
2833 return 1;
2834 }
2835
2836 size = (exit_qualification & 7) + 1;
2837 in = (exit_qualification & 8) != 0;
2838 port = exit_qualification >> 16;
2839
2840 skip_emulated_instruction(vcpu);
2841 return kvm_emulate_pio(vcpu, kvm_run, in, size, port);
2842 }
2843
2844 static void
2845 vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
2846 {
2847 /*
2848 * Patch in the VMCALL instruction:
2849 */
2850 hypercall[0] = 0x0f;
2851 hypercall[1] = 0x01;
2852 hypercall[2] = 0xc1;
2853 }
2854
2855 static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2856 {
2857 unsigned long exit_qualification, val;
2858 int cr;
2859 int reg;
2860
2861 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2862 cr = exit_qualification & 15;
2863 reg = (exit_qualification >> 8) & 15;
2864 switch ((exit_qualification >> 4) & 3) {
2865 case 0: /* mov to cr */
2866 val = kvm_register_read(vcpu, reg);
2867 trace_kvm_cr_write(cr, val);
2868 switch (cr) {
2869 case 0:
2870 kvm_set_cr0(vcpu, val);
2871 skip_emulated_instruction(vcpu);
2872 return 1;
2873 case 3:
2874 kvm_set_cr3(vcpu, val);
2875 skip_emulated_instruction(vcpu);
2876 return 1;
2877 case 4:
2878 kvm_set_cr4(vcpu, val);
2879 skip_emulated_instruction(vcpu);
2880 return 1;
2881 case 8: {
2882 u8 cr8_prev = kvm_get_cr8(vcpu);
2883 u8 cr8 = kvm_register_read(vcpu, reg);
2884 kvm_set_cr8(vcpu, cr8);
2885 skip_emulated_instruction(vcpu);
2886 if (irqchip_in_kernel(vcpu->kvm))
2887 return 1;
2888 if (cr8_prev <= cr8)
2889 return 1;
2890 kvm_run->exit_reason = KVM_EXIT_SET_TPR;
2891 return 0;
2892 }
2893 };
2894 break;
2895 case 2: /* clts */
2896 vmx_fpu_deactivate(vcpu);
2897 vcpu->arch.cr0 &= ~X86_CR0_TS;
2898 vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
2899 vmx_fpu_activate(vcpu);
2900 skip_emulated_instruction(vcpu);
2901 return 1;
2902 case 1: /*mov from cr*/
2903 switch (cr) {
2904 case 3:
2905 kvm_register_write(vcpu, reg, vcpu->arch.cr3);
2906 trace_kvm_cr_read(cr, vcpu->arch.cr3);
2907 skip_emulated_instruction(vcpu);
2908 return 1;
2909 case 8:
2910 val = kvm_get_cr8(vcpu);
2911 kvm_register_write(vcpu, reg, val);
2912 trace_kvm_cr_read(cr, val);
2913 skip_emulated_instruction(vcpu);
2914 return 1;
2915 }
2916 break;
2917 case 3: /* lmsw */
2918 kvm_lmsw(vcpu, (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f);
2919
2920 skip_emulated_instruction(vcpu);
2921 return 1;
2922 default:
2923 break;
2924 }
2925 kvm_run->exit_reason = 0;
2926 pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
2927 (int)(exit_qualification >> 4) & 3, cr);
2928 return 0;
2929 }
2930
2931 static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2932 {
2933 unsigned long exit_qualification;
2934 unsigned long val;
2935 int dr, reg;
2936
2937 if (!kvm_require_cpl(vcpu, 0))
2938 return 1;
2939 dr = vmcs_readl(GUEST_DR7);
2940 if (dr & DR7_GD) {
2941 /*
2942 * As the vm-exit takes precedence over the debug trap, we
2943 * need to emulate the latter, either for the host or the
2944 * guest debugging itself.
2945 */
2946 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
2947 kvm_run->debug.arch.dr6 = vcpu->arch.dr6;
2948 kvm_run->debug.arch.dr7 = dr;
2949 kvm_run->debug.arch.pc =
2950 vmcs_readl(GUEST_CS_BASE) +
2951 vmcs_readl(GUEST_RIP);
2952 kvm_run->debug.arch.exception = DB_VECTOR;
2953 kvm_run->exit_reason = KVM_EXIT_DEBUG;
2954 return 0;
2955 } else {
2956 vcpu->arch.dr7 &= ~DR7_GD;
2957 vcpu->arch.dr6 |= DR6_BD;
2958 vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
2959 kvm_queue_exception(vcpu, DB_VECTOR);
2960 return 1;
2961 }
2962 }
2963
2964 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2965 dr = exit_qualification & DEBUG_REG_ACCESS_NUM;
2966 reg = DEBUG_REG_ACCESS_REG(exit_qualification);
2967 if (exit_qualification & TYPE_MOV_FROM_DR) {
2968 switch (dr) {
2969 case 0 ... 3:
2970 val = vcpu->arch.db[dr];
2971 break;
2972 case 6:
2973 val = vcpu->arch.dr6;
2974 break;
2975 case 7:
2976 val = vcpu->arch.dr7;
2977 break;
2978 default:
2979 val = 0;
2980 }
2981 kvm_register_write(vcpu, reg, val);
2982 } else {
2983 val = vcpu->arch.regs[reg];
2984 switch (dr) {
2985 case 0 ... 3:
2986 vcpu->arch.db[dr] = val;
2987 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
2988 vcpu->arch.eff_db[dr] = val;
2989 break;
2990 case 4 ... 5:
2991 if (vcpu->arch.cr4 & X86_CR4_DE)
2992 kvm_queue_exception(vcpu, UD_VECTOR);
2993 break;
2994 case 6:
2995 if (val & 0xffffffff00000000ULL) {
2996 kvm_queue_exception(vcpu, GP_VECTOR);
2997 break;
2998 }
2999 vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
3000 break;
3001 case 7:
3002 if (val & 0xffffffff00000000ULL) {
3003 kvm_queue_exception(vcpu, GP_VECTOR);
3004 break;
3005 }
3006 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
3007 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
3008 vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
3009 vcpu->arch.switch_db_regs =
3010 (val & DR7_BP_EN_MASK);
3011 }
3012 break;
3013 }
3014 }
3015 skip_emulated_instruction(vcpu);
3016 return 1;
3017 }
3018
3019 static int handle_cpuid(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3020 {
3021 kvm_emulate_cpuid(vcpu);
3022 return 1;
3023 }
3024
3025 static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3026 {
3027 u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
3028 u64 data;
3029
3030 if (vmx_get_msr(vcpu, ecx, &data)) {
3031 kvm_inject_gp(vcpu, 0);
3032 return 1;
3033 }
3034
3035 trace_kvm_msr_read(ecx, data);
3036
3037 /* FIXME: handling of bits 32:63 of rax, rdx */
3038 vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
3039 vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
3040 skip_emulated_instruction(vcpu);
3041 return 1;
3042 }
3043
3044 static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3045 {
3046 u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
3047 u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
3048 | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
3049
3050 trace_kvm_msr_write(ecx, data);
3051
3052 if (vmx_set_msr(vcpu, ecx, data) != 0) {
3053 kvm_inject_gp(vcpu, 0);
3054 return 1;
3055 }
3056
3057 skip_emulated_instruction(vcpu);
3058 return 1;
3059 }
3060
3061 static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu,
3062 struct kvm_run *kvm_run)
3063 {
3064 return 1;
3065 }
3066
3067 static int handle_interrupt_window(struct kvm_vcpu *vcpu,
3068 struct kvm_run *kvm_run)
3069 {
3070 u32 cpu_based_vm_exec_control;
3071
3072 /* clear pending irq */
3073 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
3074 cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
3075 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
3076
3077 ++vcpu->stat.irq_window_exits;
3078
3079 /*
3080 * If the user space waits to inject interrupts, exit as soon as
3081 * possible
3082 */
3083 if (!irqchip_in_kernel(vcpu->kvm) &&
3084 kvm_run->request_interrupt_window &&
3085 !kvm_cpu_has_interrupt(vcpu)) {
3086 kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
3087 return 0;
3088 }
3089 return 1;
3090 }
3091
3092 static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3093 {
3094 skip_emulated_instruction(vcpu);
3095 return kvm_emulate_halt(vcpu);
3096 }
3097
3098 static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3099 {
3100 skip_emulated_instruction(vcpu);
3101 kvm_emulate_hypercall(vcpu);
3102 return 1;
3103 }
3104
3105 static int handle_vmx_insn(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3106 {
3107 kvm_queue_exception(vcpu, UD_VECTOR);
3108 return 1;
3109 }
3110
3111 static int handle_invlpg(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3112 {
3113 unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3114
3115 kvm_mmu_invlpg(vcpu, exit_qualification);
3116 skip_emulated_instruction(vcpu);
3117 return 1;
3118 }
3119
3120 static int handle_wbinvd(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3121 {
3122 skip_emulated_instruction(vcpu);
3123 /* TODO: Add support for VT-d/pass-through device */
3124 return 1;
3125 }
3126
3127 static int handle_apic_access(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3128 {
3129 unsigned long exit_qualification;
3130 enum emulation_result er;
3131 unsigned long offset;
3132
3133 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3134 offset = exit_qualification & 0xffful;
3135
3136 er = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
3137
3138 if (er != EMULATE_DONE) {
3139 printk(KERN_ERR
3140 "Fail to handle apic access vmexit! Offset is 0x%lx\n",
3141 offset);
3142 return -ENOEXEC;
3143 }
3144 return 1;
3145 }
3146
3147 static int handle_task_switch(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3148 {
3149 struct vcpu_vmx *vmx = to_vmx(vcpu);
3150 unsigned long exit_qualification;
3151 u16 tss_selector;
3152 int reason, type, idt_v;
3153
3154 idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK);
3155 type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK);
3156
3157 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3158
3159 reason = (u32)exit_qualification >> 30;
3160 if (reason == TASK_SWITCH_GATE && idt_v) {
3161 switch (type) {
3162 case INTR_TYPE_NMI_INTR:
3163 vcpu->arch.nmi_injected = false;
3164 if (cpu_has_virtual_nmis())
3165 vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
3166 GUEST_INTR_STATE_NMI);
3167 break;
3168 case INTR_TYPE_EXT_INTR:
3169 case INTR_TYPE_SOFT_INTR:
3170 kvm_clear_interrupt_queue(vcpu);
3171 break;
3172 case INTR_TYPE_HARD_EXCEPTION:
3173 case INTR_TYPE_SOFT_EXCEPTION:
3174 kvm_clear_exception_queue(vcpu);
3175 break;
3176 default:
3177 break;
3178 }
3179 }
3180 tss_selector = exit_qualification;
3181
3182 if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION &&
3183 type != INTR_TYPE_EXT_INTR &&
3184 type != INTR_TYPE_NMI_INTR))
3185 skip_emulated_instruction(vcpu);
3186
3187 if (!kvm_task_switch(vcpu, tss_selector, reason))
3188 return 0;
3189
3190 /* clear all local breakpoint enable flags */
3191 vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55);
3192
3193 /*
3194 * TODO: What about debug traps on tss switch?
3195 * Are we supposed to inject them and update dr6?
3196 */
3197
3198 return 1;
3199 }
3200
3201 static int handle_ept_violation(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3202 {
3203 unsigned long exit_qualification;
3204 gpa_t gpa;
3205 int gla_validity;
3206
3207 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3208
3209 if (exit_qualification & (1 << 6)) {
3210 printk(KERN_ERR "EPT: GPA exceeds GAW!\n");
3211 return -EINVAL;
3212 }
3213
3214 gla_validity = (exit_qualification >> 7) & 0x3;
3215 if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) {
3216 printk(KERN_ERR "EPT: Handling EPT violation failed!\n");
3217 printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n",
3218 (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS),
3219 vmcs_readl(GUEST_LINEAR_ADDRESS));
3220 printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
3221 (long unsigned int)exit_qualification);
3222 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
3223 kvm_run->hw.hardware_exit_reason = EXIT_REASON_EPT_VIOLATION;
3224 return 0;
3225 }
3226
3227 gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
3228 trace_kvm_page_fault(gpa, exit_qualification);
3229 return kvm_mmu_page_fault(vcpu, gpa & PAGE_MASK, 0);
3230 }
3231
3232 static u64 ept_rsvd_mask(u64 spte, int level)
3233 {
3234 int i;
3235 u64 mask = 0;
3236
3237 for (i = 51; i > boot_cpu_data.x86_phys_bits; i--)
3238 mask |= (1ULL << i);
3239
3240 if (level > 2)
3241 /* bits 7:3 reserved */
3242 mask |= 0xf8;
3243 else if (level == 2) {
3244 if (spte & (1ULL << 7))
3245 /* 2MB ref, bits 20:12 reserved */
3246 mask |= 0x1ff000;
3247 else
3248 /* bits 6:3 reserved */
3249 mask |= 0x78;
3250 }
3251
3252 return mask;
3253 }
3254
3255 static void ept_misconfig_inspect_spte(struct kvm_vcpu *vcpu, u64 spte,
3256 int level)
3257 {
3258 printk(KERN_ERR "%s: spte 0x%llx level %d\n", __func__, spte, level);
3259
3260 /* 010b (write-only) */
3261 WARN_ON((spte & 0x7) == 0x2);
3262
3263 /* 110b (write/execute) */
3264 WARN_ON((spte & 0x7) == 0x6);
3265
3266 /* 100b (execute-only) and value not supported by logical processor */
3267 if (!cpu_has_vmx_ept_execute_only())
3268 WARN_ON((spte & 0x7) == 0x4);
3269
3270 /* not 000b */
3271 if ((spte & 0x7)) {
3272 u64 rsvd_bits = spte & ept_rsvd_mask(spte, level);
3273
3274 if (rsvd_bits != 0) {
3275 printk(KERN_ERR "%s: rsvd_bits = 0x%llx\n",
3276 __func__, rsvd_bits);
3277 WARN_ON(1);
3278 }
3279
3280 if (level == 1 || (level == 2 && (spte & (1ULL << 7)))) {
3281 u64 ept_mem_type = (spte & 0x38) >> 3;
3282
3283 if (ept_mem_type == 2 || ept_mem_type == 3 ||
3284 ept_mem_type == 7) {
3285 printk(KERN_ERR "%s: ept_mem_type=0x%llx\n",
3286 __func__, ept_mem_type);
3287 WARN_ON(1);
3288 }
3289 }
3290 }
3291 }
3292
3293 static int handle_ept_misconfig(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3294 {
3295 u64 sptes[4];
3296 int nr_sptes, i;
3297 gpa_t gpa;
3298
3299 gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
3300
3301 printk(KERN_ERR "EPT: Misconfiguration.\n");
3302 printk(KERN_ERR "EPT: GPA: 0x%llx\n", gpa);
3303
3304 nr_sptes = kvm_mmu_get_spte_hierarchy(vcpu, gpa, sptes);
3305
3306 for (i = PT64_ROOT_LEVEL; i > PT64_ROOT_LEVEL - nr_sptes; --i)
3307 ept_misconfig_inspect_spte(vcpu, sptes[i-1], i);
3308
3309 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
3310 kvm_run->hw.hardware_exit_reason = EXIT_REASON_EPT_MISCONFIG;
3311
3312 return 0;
3313 }
3314
3315 static int handle_nmi_window(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3316 {
3317 u32 cpu_based_vm_exec_control;
3318
3319 /* clear pending NMI */
3320 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
3321 cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
3322 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
3323 ++vcpu->stat.nmi_window_exits;
3324
3325 return 1;
3326 }
3327
3328 static void handle_invalid_guest_state(struct kvm_vcpu *vcpu,
3329 struct kvm_run *kvm_run)
3330 {
3331 struct vcpu_vmx *vmx = to_vmx(vcpu);
3332 enum emulation_result err = EMULATE_DONE;
3333
3334 local_irq_enable();
3335 preempt_enable();
3336
3337 while (!guest_state_valid(vcpu)) {
3338 err = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
3339
3340 if (err == EMULATE_DO_MMIO)
3341 break;
3342
3343 if (err != EMULATE_DONE) {
3344 kvm_report_emulation_failure(vcpu, "emulation failure");
3345 break;
3346 }
3347
3348 if (signal_pending(current))
3349 break;
3350 if (need_resched())
3351 schedule();
3352 }
3353
3354 preempt_disable();
3355 local_irq_disable();
3356
3357 vmx->invalid_state_emulation_result = err;
3358 }
3359
3360 /*
3361 * The exit handlers return 1 if the exit was handled fully and guest execution
3362 * may resume. Otherwise they set the kvm_run parameter to indicate what needs
3363 * to be done to userspace and return 0.
3364 */
3365 static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu,
3366 struct kvm_run *kvm_run) = {
3367 [EXIT_REASON_EXCEPTION_NMI] = handle_exception,
3368 [EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt,
3369 [EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault,
3370 [EXIT_REASON_NMI_WINDOW] = handle_nmi_window,
3371 [EXIT_REASON_IO_INSTRUCTION] = handle_io,
3372 [EXIT_REASON_CR_ACCESS] = handle_cr,
3373 [EXIT_REASON_DR_ACCESS] = handle_dr,
3374 [EXIT_REASON_CPUID] = handle_cpuid,
3375 [EXIT_REASON_MSR_READ] = handle_rdmsr,
3376 [EXIT_REASON_MSR_WRITE] = handle_wrmsr,
3377 [EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window,
3378 [EXIT_REASON_HLT] = handle_halt,
3379 [EXIT_REASON_INVLPG] = handle_invlpg,
3380 [EXIT_REASON_VMCALL] = handle_vmcall,
3381 [EXIT_REASON_VMCLEAR] = handle_vmx_insn,
3382 [EXIT_REASON_VMLAUNCH] = handle_vmx_insn,
3383 [EXIT_REASON_VMPTRLD] = handle_vmx_insn,
3384 [EXIT_REASON_VMPTRST] = handle_vmx_insn,
3385 [EXIT_REASON_VMREAD] = handle_vmx_insn,
3386 [EXIT_REASON_VMRESUME] = handle_vmx_insn,
3387 [EXIT_REASON_VMWRITE] = handle_vmx_insn,
3388 [EXIT_REASON_VMOFF] = handle_vmx_insn,
3389 [EXIT_REASON_VMON] = handle_vmx_insn,
3390 [EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold,
3391 [EXIT_REASON_APIC_ACCESS] = handle_apic_access,
3392 [EXIT_REASON_WBINVD] = handle_wbinvd,
3393 [EXIT_REASON_TASK_SWITCH] = handle_task_switch,
3394 [EXIT_REASON_MCE_DURING_VMENTRY] = handle_machine_check,
3395 [EXIT_REASON_EPT_VIOLATION] = handle_ept_violation,
3396 [EXIT_REASON_EPT_MISCONFIG] = handle_ept_misconfig,
3397 };
3398
3399 static const int kvm_vmx_max_exit_handlers =
3400 ARRAY_SIZE(kvm_vmx_exit_handlers);
3401
3402 /*
3403 * The guest has exited. See if we can fix it or if we need userspace
3404 * assistance.
3405 */
3406 static int vmx_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
3407 {
3408 struct vcpu_vmx *vmx = to_vmx(vcpu);
3409 u32 exit_reason = vmx->exit_reason;
3410 u32 vectoring_info = vmx->idt_vectoring_info;
3411
3412 trace_kvm_exit(exit_reason, kvm_rip_read(vcpu));
3413
3414 /* If we need to emulate an MMIO from handle_invalid_guest_state
3415 * we just return 0 */
3416 if (vmx->emulation_required && emulate_invalid_guest_state) {
3417 if (guest_state_valid(vcpu))
3418 vmx->emulation_required = 0;
3419 return vmx->invalid_state_emulation_result != EMULATE_DO_MMIO;
3420 }
3421
3422 /* Access CR3 don't cause VMExit in paging mode, so we need
3423 * to sync with guest real CR3. */
3424 if (enable_ept && is_paging(vcpu))
3425 vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
3426
3427 if (unlikely(vmx->fail)) {
3428 kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
3429 kvm_run->fail_entry.hardware_entry_failure_reason
3430 = vmcs_read32(VM_INSTRUCTION_ERROR);
3431 return 0;
3432 }
3433
3434 if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
3435 (exit_reason != EXIT_REASON_EXCEPTION_NMI &&
3436 exit_reason != EXIT_REASON_EPT_VIOLATION &&
3437 exit_reason != EXIT_REASON_TASK_SWITCH))
3438 printk(KERN_WARNING "%s: unexpected, valid vectoring info "
3439 "(0x%x) and exit reason is 0x%x\n",
3440 __func__, vectoring_info, exit_reason);
3441
3442 if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) {
3443 if (vmx_interrupt_allowed(vcpu)) {
3444 vmx->soft_vnmi_blocked = 0;
3445 } else if (vmx->vnmi_blocked_time > 1000000000LL &&
3446 vcpu->arch.nmi_pending) {
3447 /*
3448 * This CPU don't support us in finding the end of an
3449 * NMI-blocked window if the guest runs with IRQs
3450 * disabled. So we pull the trigger after 1 s of
3451 * futile waiting, but inform the user about this.
3452 */
3453 printk(KERN_WARNING "%s: Breaking out of NMI-blocked "
3454 "state on VCPU %d after 1 s timeout\n",
3455 __func__, vcpu->vcpu_id);
3456 vmx->soft_vnmi_blocked = 0;
3457 }
3458 }
3459
3460 if (exit_reason < kvm_vmx_max_exit_handlers
3461 && kvm_vmx_exit_handlers[exit_reason])
3462 return kvm_vmx_exit_handlers[exit_reason](vcpu, kvm_run);
3463 else {
3464 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
3465 kvm_run->hw.hardware_exit_reason = exit_reason;
3466 }
3467 return 0;
3468 }
3469
3470 static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
3471 {
3472 if (irr == -1 || tpr < irr) {
3473 vmcs_write32(TPR_THRESHOLD, 0);
3474 return;
3475 }
3476
3477 vmcs_write32(TPR_THRESHOLD, irr);
3478 }
3479
3480 static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
3481 {
3482 u32 exit_intr_info;
3483 u32 idt_vectoring_info = vmx->idt_vectoring_info;
3484 bool unblock_nmi;
3485 u8 vector;
3486 int type;
3487 bool idtv_info_valid;
3488
3489 exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
3490
3491 vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
3492
3493 /* Handle machine checks before interrupts are enabled */
3494 if ((vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY)
3495 || (vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI
3496 && is_machine_check(exit_intr_info)))
3497 kvm_machine_check();
3498
3499 /* We need to handle NMIs before interrupts are enabled */
3500 if ((exit_intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR &&
3501 (exit_intr_info & INTR_INFO_VALID_MASK))
3502 asm("int $2");
3503
3504 idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;
3505
3506 if (cpu_has_virtual_nmis()) {
3507 unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
3508 vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
3509 /*
3510 * SDM 3: 27.7.1.2 (September 2008)
3511 * Re-set bit "block by NMI" before VM entry if vmexit caused by
3512 * a guest IRET fault.
3513 * SDM 3: 23.2.2 (September 2008)
3514 * Bit 12 is undefined in any of the following cases:
3515 * If the VM exit sets the valid bit in the IDT-vectoring
3516 * information field.
3517 * If the VM exit is due to a double fault.
3518 */
3519 if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi &&
3520 vector != DF_VECTOR && !idtv_info_valid)
3521 vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
3522 GUEST_INTR_STATE_NMI);
3523 } else if (unlikely(vmx->soft_vnmi_blocked))
3524 vmx->vnmi_blocked_time +=
3525 ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time));
3526
3527 vmx->vcpu.arch.nmi_injected = false;
3528 kvm_clear_exception_queue(&vmx->vcpu);
3529 kvm_clear_interrupt_queue(&vmx->vcpu);
3530
3531 if (!idtv_info_valid)
3532 return;
3533
3534 vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
3535 type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;
3536
3537 switch (type) {
3538 case INTR_TYPE_NMI_INTR:
3539 vmx->vcpu.arch.nmi_injected = true;
3540 /*
3541 * SDM 3: 27.7.1.2 (September 2008)
3542 * Clear bit "block by NMI" before VM entry if a NMI
3543 * delivery faulted.
3544 */
3545 vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
3546 GUEST_INTR_STATE_NMI);
3547 break;
3548 case INTR_TYPE_SOFT_EXCEPTION:
3549 vmx->vcpu.arch.event_exit_inst_len =
3550 vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
3551 /* fall through */
3552 case INTR_TYPE_HARD_EXCEPTION:
3553 if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) {
3554 u32 err = vmcs_read32(IDT_VECTORING_ERROR_CODE);
3555 kvm_queue_exception_e(&vmx->vcpu, vector, err);
3556 } else
3557 kvm_queue_exception(&vmx->vcpu, vector);
3558 break;
3559 case INTR_TYPE_SOFT_INTR:
3560 vmx->vcpu.arch.event_exit_inst_len =
3561 vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
3562 /* fall through */
3563 case INTR_TYPE_EXT_INTR:
3564 kvm_queue_interrupt(&vmx->vcpu, vector,
3565 type == INTR_TYPE_SOFT_INTR);
3566 break;
3567 default:
3568 break;
3569 }
3570 }
3571
3572 /*
3573 * Failure to inject an interrupt should give us the information
3574 * in IDT_VECTORING_INFO_FIELD. However, if the failure occurs
3575 * when fetching the interrupt redirection bitmap in the real-mode
3576 * tss, this doesn't happen. So we do it ourselves.
3577 */
3578 static void fixup_rmode_irq(struct vcpu_vmx *vmx)
3579 {
3580 vmx->rmode.irq.pending = 0;
3581 if (kvm_rip_read(&vmx->vcpu) + 1 != vmx->rmode.irq.rip)
3582 return;
3583 kvm_rip_write(&vmx->vcpu, vmx->rmode.irq.rip);
3584 if (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) {
3585 vmx->idt_vectoring_info &= ~VECTORING_INFO_TYPE_MASK;
3586 vmx->idt_vectoring_info |= INTR_TYPE_EXT_INTR;
3587 return;
3588 }
3589 vmx->idt_vectoring_info =
3590 VECTORING_INFO_VALID_MASK
3591 | INTR_TYPE_EXT_INTR
3592 | vmx->rmode.irq.vector;
3593 }
3594
3595 #ifdef CONFIG_X86_64
3596 #define R "r"
3597 #define Q "q"
3598 #else
3599 #define R "e"
3600 #define Q "l"
3601 #endif
3602
3603 static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3604 {
3605 struct vcpu_vmx *vmx = to_vmx(vcpu);
3606
3607 if (enable_ept && is_paging(vcpu)) {
3608 vmcs_writel(GUEST_CR3, vcpu->arch.cr3);
3609 ept_load_pdptrs(vcpu);
3610 }
3611 /* Record the guest's net vcpu time for enforced NMI injections. */
3612 if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
3613 vmx->entry_time = ktime_get();
3614
3615 /* Handle invalid guest state instead of entering VMX */
3616 if (vmx->emulation_required && emulate_invalid_guest_state) {
3617 handle_invalid_guest_state(vcpu, kvm_run);
3618 return;
3619 }
3620
3621 if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
3622 vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
3623 if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
3624 vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
3625
3626 /* When single-stepping over STI and MOV SS, we must clear the
3627 * corresponding interruptibility bits in the guest state. Otherwise
3628 * vmentry fails as it then expects bit 14 (BS) in pending debug
3629 * exceptions being set, but that's not correct for the guest debugging
3630 * case. */
3631 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
3632 vmx_set_interrupt_shadow(vcpu, 0);
3633
3634 /*
3635 * Loading guest fpu may have cleared host cr0.ts
3636 */
3637 vmcs_writel(HOST_CR0, read_cr0());
3638
3639 if (vcpu->arch.switch_db_regs)
3640 set_debugreg(vcpu->arch.dr6, 6);
3641
3642 asm(
3643 /* Store host registers */
3644 "push %%"R"dx; push %%"R"bp;"
3645 "push %%"R"cx \n\t"
3646 "cmp %%"R"sp, %c[host_rsp](%0) \n\t"
3647 "je 1f \n\t"
3648 "mov %%"R"sp, %c[host_rsp](%0) \n\t"
3649 __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t"
3650 "1: \n\t"
3651 /* Reload cr2 if changed */
3652 "mov %c[cr2](%0), %%"R"ax \n\t"
3653 "mov %%cr2, %%"R"dx \n\t"
3654 "cmp %%"R"ax, %%"R"dx \n\t"
3655 "je 2f \n\t"
3656 "mov %%"R"ax, %%cr2 \n\t"
3657 "2: \n\t"
3658 /* Check if vmlaunch of vmresume is needed */
3659 "cmpl $0, %c[launched](%0) \n\t"
3660 /* Load guest registers. Don't clobber flags. */
3661 "mov %c[rax](%0), %%"R"ax \n\t"
3662 "mov %c[rbx](%0), %%"R"bx \n\t"
3663 "mov %c[rdx](%0), %%"R"dx \n\t"
3664 "mov %c[rsi](%0), %%"R"si \n\t"
3665 "mov %c[rdi](%0), %%"R"di \n\t"
3666 "mov %c[rbp](%0), %%"R"bp \n\t"
3667 #ifdef CONFIG_X86_64
3668 "mov %c[r8](%0), %%r8 \n\t"
3669 "mov %c[r9](%0), %%r9 \n\t"
3670 "mov %c[r10](%0), %%r10 \n\t"
3671 "mov %c[r11](%0), %%r11 \n\t"
3672 "mov %c[r12](%0), %%r12 \n\t"
3673 "mov %c[r13](%0), %%r13 \n\t"
3674 "mov %c[r14](%0), %%r14 \n\t"
3675 "mov %c[r15](%0), %%r15 \n\t"
3676 #endif
3677 "mov %c[rcx](%0), %%"R"cx \n\t" /* kills %0 (ecx) */
3678
3679 /* Enter guest mode */
3680 "jne .Llaunched \n\t"
3681 __ex(ASM_VMX_VMLAUNCH) "\n\t"
3682 "jmp .Lkvm_vmx_return \n\t"
3683 ".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t"
3684 ".Lkvm_vmx_return: "
3685 /* Save guest registers, load host registers, keep flags */
3686 "xchg %0, (%%"R"sp) \n\t"
3687 "mov %%"R"ax, %c[rax](%0) \n\t"
3688 "mov %%"R"bx, %c[rbx](%0) \n\t"
3689 "push"Q" (%%"R"sp); pop"Q" %c[rcx](%0) \n\t"
3690 "mov %%"R"dx, %c[rdx](%0) \n\t"
3691 "mov %%"R"si, %c[rsi](%0) \n\t"
3692 "mov %%"R"di, %c[rdi](%0) \n\t"
3693 "mov %%"R"bp, %c[rbp](%0) \n\t"
3694 #ifdef CONFIG_X86_64
3695 "mov %%r8, %c[r8](%0) \n\t"
3696 "mov %%r9, %c[r9](%0) \n\t"
3697 "mov %%r10, %c[r10](%0) \n\t"
3698 "mov %%r11, %c[r11](%0) \n\t"
3699 "mov %%r12, %c[r12](%0) \n\t"
3700 "mov %%r13, %c[r13](%0) \n\t"
3701 "mov %%r14, %c[r14](%0) \n\t"
3702 "mov %%r15, %c[r15](%0) \n\t"
3703 #endif
3704 "mov %%cr2, %%"R"ax \n\t"
3705 "mov %%"R"ax, %c[cr2](%0) \n\t"
3706
3707 "pop %%"R"bp; pop %%"R"bp; pop %%"R"dx \n\t"
3708 "setbe %c[fail](%0) \n\t"
3709 : : "c"(vmx), "d"((unsigned long)HOST_RSP),
3710 [launched]"i"(offsetof(struct vcpu_vmx, launched)),
3711 [fail]"i"(offsetof(struct vcpu_vmx, fail)),
3712 [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)),
3713 [rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])),
3714 [rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])),
3715 [rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])),
3716 [rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])),
3717 [rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])),
3718 [rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])),
3719 [rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])),
3720 #ifdef CONFIG_X86_64
3721 [r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])),
3722 [r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])),
3723 [r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])),
3724 [r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])),
3725 [r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])),
3726 [r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])),
3727 [r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])),
3728 [r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])),
3729 #endif
3730 [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2))
3731 : "cc", "memory"
3732 , R"bx", R"di", R"si"
3733 #ifdef CONFIG_X86_64
3734 , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
3735 #endif
3736 );
3737
3738 vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)
3739 | (1 << VCPU_EXREG_PDPTR));
3740 vcpu->arch.regs_dirty = 0;
3741
3742 if (vcpu->arch.switch_db_regs)
3743 get_debugreg(vcpu->arch.dr6, 6);
3744
3745 vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
3746 if (vmx->rmode.irq.pending)
3747 fixup_rmode_irq(vmx);
3748
3749 asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
3750 vmx->launched = 1;
3751
3752 vmx_complete_interrupts(vmx);
3753 }
3754
3755 #undef R
3756 #undef Q
3757
3758 static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
3759 {
3760 struct vcpu_vmx *vmx = to_vmx(vcpu);
3761
3762 if (vmx->vmcs) {
3763 vcpu_clear(vmx);
3764 free_vmcs(vmx->vmcs);
3765 vmx->vmcs = NULL;
3766 }
3767 }
3768
3769 static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
3770 {
3771 struct vcpu_vmx *vmx = to_vmx(vcpu);
3772
3773 spin_lock(&vmx_vpid_lock);
3774 if (vmx->vpid != 0)
3775 __clear_bit(vmx->vpid, vmx_vpid_bitmap);
3776 spin_unlock(&vmx_vpid_lock);
3777 vmx_free_vmcs(vcpu);
3778 kfree(vmx->host_msrs);
3779 kfree(vmx->guest_msrs);
3780 kvm_vcpu_uninit(vcpu);
3781 kmem_cache_free(kvm_vcpu_cache, vmx);
3782 }
3783
3784 static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
3785 {
3786 int err;
3787 struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
3788 int cpu;
3789
3790 if (!vmx)
3791 return ERR_PTR(-ENOMEM);
3792
3793 allocate_vpid(vmx);
3794
3795 err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
3796 if (err)
3797 goto free_vcpu;
3798
3799 vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
3800 if (!vmx->guest_msrs) {
3801 err = -ENOMEM;
3802 goto uninit_vcpu;
3803 }
3804
3805 vmx->host_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
3806 if (!vmx->host_msrs)
3807 goto free_guest_msrs;
3808
3809 vmx->vmcs = alloc_vmcs();
3810 if (!vmx->vmcs)
3811 goto free_msrs;
3812
3813 vmcs_clear(vmx->vmcs);
3814
3815 cpu = get_cpu();
3816 vmx_vcpu_load(&vmx->vcpu, cpu);
3817 err = vmx_vcpu_setup(vmx);
3818 vmx_vcpu_put(&vmx->vcpu);
3819 put_cpu();
3820 if (err)
3821 goto free_vmcs;
3822 if (vm_need_virtualize_apic_accesses(kvm))
3823 if (alloc_apic_access_page(kvm) != 0)
3824 goto free_vmcs;
3825
3826 if (enable_ept) {
3827 if (!kvm->arch.ept_identity_map_addr)
3828 kvm->arch.ept_identity_map_addr =
3829 VMX_EPT_IDENTITY_PAGETABLE_ADDR;
3830 if (alloc_identity_pagetable(kvm) != 0)
3831 goto free_vmcs;
3832 }
3833
3834 return &vmx->vcpu;
3835
3836 free_vmcs:
3837 free_vmcs(vmx->vmcs);
3838 free_msrs:
3839 kfree(vmx->host_msrs);
3840 free_guest_msrs:
3841 kfree(vmx->guest_msrs);
3842 uninit_vcpu:
3843 kvm_vcpu_uninit(&vmx->vcpu);
3844 free_vcpu:
3845 kmem_cache_free(kvm_vcpu_cache, vmx);
3846 return ERR_PTR(err);
3847 }
3848
3849 static void __init vmx_check_processor_compat(void *rtn)
3850 {
3851 struct vmcs_config vmcs_conf;
3852
3853 *(int *)rtn = 0;
3854 if (setup_vmcs_config(&vmcs_conf) < 0)
3855 *(int *)rtn = -EIO;
3856 if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) {
3857 printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n",
3858 smp_processor_id());
3859 *(int *)rtn = -EIO;
3860 }
3861 }
3862
3863 static int get_ept_level(void)
3864 {
3865 return VMX_EPT_DEFAULT_GAW + 1;
3866 }
3867
3868 static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
3869 {
3870 u64 ret;
3871
3872 /* For VT-d and EPT combination
3873 * 1. MMIO: always map as UC
3874 * 2. EPT with VT-d:
3875 * a. VT-d without snooping control feature: can't guarantee the
3876 * result, try to trust guest.
3877 * b. VT-d with snooping control feature: snooping control feature of
3878 * VT-d engine can guarantee the cache correctness. Just set it
3879 * to WB to keep consistent with host. So the same as item 3.
3880 * 3. EPT without VT-d: always map as WB and set IGMT=1 to keep
3881 * consistent with host MTRR
3882 */
3883 if (is_mmio)
3884 ret = MTRR_TYPE_UNCACHABLE << VMX_EPT_MT_EPTE_SHIFT;
3885 else if (vcpu->kvm->arch.iommu_domain &&
3886 !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY))
3887 ret = kvm_get_guest_memory_type(vcpu, gfn) <<
3888 VMX_EPT_MT_EPTE_SHIFT;
3889 else
3890 ret = (MTRR_TYPE_WRBACK << VMX_EPT_MT_EPTE_SHIFT)
3891 | VMX_EPT_IGMT_BIT;
3892
3893 return ret;
3894 }
3895
3896 static const struct trace_print_flags vmx_exit_reasons_str[] = {
3897 { EXIT_REASON_EXCEPTION_NMI, "exception" },
3898 { EXIT_REASON_EXTERNAL_INTERRUPT, "ext_irq" },
3899 { EXIT_REASON_TRIPLE_FAULT, "triple_fault" },
3900 { EXIT_REASON_NMI_WINDOW, "nmi_window" },
3901 { EXIT_REASON_IO_INSTRUCTION, "io_instruction" },
3902 { EXIT_REASON_CR_ACCESS, "cr_access" },
3903 { EXIT_REASON_DR_ACCESS, "dr_access" },
3904 { EXIT_REASON_CPUID, "cpuid" },
3905 { EXIT_REASON_MSR_READ, "rdmsr" },
3906 { EXIT_REASON_MSR_WRITE, "wrmsr" },
3907 { EXIT_REASON_PENDING_INTERRUPT, "interrupt_window" },
3908 { EXIT_REASON_HLT, "halt" },
3909 { EXIT_REASON_INVLPG, "invlpg" },
3910 { EXIT_REASON_VMCALL, "hypercall" },
3911 { EXIT_REASON_TPR_BELOW_THRESHOLD, "tpr_below_thres" },
3912 { EXIT_REASON_APIC_ACCESS, "apic_access" },
3913 { EXIT_REASON_WBINVD, "wbinvd" },
3914 { EXIT_REASON_TASK_SWITCH, "task_switch" },
3915 { EXIT_REASON_EPT_VIOLATION, "ept_violation" },
3916 { -1, NULL }
3917 };
3918
3919 static bool vmx_gb_page_enable(void)
3920 {
3921 return false;
3922 }
3923
3924 static struct kvm_x86_ops vmx_x86_ops = {
3925 .cpu_has_kvm_support = cpu_has_kvm_support,
3926 .disabled_by_bios = vmx_disabled_by_bios,
3927 .hardware_setup = hardware_setup,
3928 .hardware_unsetup = hardware_unsetup,
3929 .check_processor_compatibility = vmx_check_processor_compat,
3930 .hardware_enable = hardware_enable,
3931 .hardware_disable = hardware_disable,
3932 .cpu_has_accelerated_tpr = report_flexpriority,
3933
3934 .vcpu_create = vmx_create_vcpu,
3935 .vcpu_free = vmx_free_vcpu,
3936 .vcpu_reset = vmx_vcpu_reset,
3937
3938 .prepare_guest_switch = vmx_save_host_state,
3939 .vcpu_load = vmx_vcpu_load,
3940 .vcpu_put = vmx_vcpu_put,
3941
3942 .set_guest_debug = set_guest_debug,
3943 .get_msr = vmx_get_msr,
3944 .set_msr = vmx_set_msr,
3945 .get_segment_base = vmx_get_segment_base,
3946 .get_segment = vmx_get_segment,
3947 .set_segment = vmx_set_segment,
3948 .get_cpl = vmx_get_cpl,
3949 .get_cs_db_l_bits = vmx_get_cs_db_l_bits,
3950 .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
3951 .set_cr0 = vmx_set_cr0,
3952 .set_cr3 = vmx_set_cr3,
3953 .set_cr4 = vmx_set_cr4,
3954 .set_efer = vmx_set_efer,
3955 .get_idt = vmx_get_idt,
3956 .set_idt = vmx_set_idt,
3957 .get_gdt = vmx_get_gdt,
3958 .set_gdt = vmx_set_gdt,
3959 .cache_reg = vmx_cache_reg,
3960 .get_rflags = vmx_get_rflags,
3961 .set_rflags = vmx_set_rflags,
3962
3963 .tlb_flush = vmx_flush_tlb,
3964
3965 .run = vmx_vcpu_run,
3966 .handle_exit = vmx_handle_exit,
3967 .skip_emulated_instruction = skip_emulated_instruction,
3968 .set_interrupt_shadow = vmx_set_interrupt_shadow,
3969 .get_interrupt_shadow = vmx_get_interrupt_shadow,
3970 .patch_hypercall = vmx_patch_hypercall,
3971 .set_irq = vmx_inject_irq,
3972 .set_nmi = vmx_inject_nmi,
3973 .queue_exception = vmx_queue_exception,
3974 .interrupt_allowed = vmx_interrupt_allowed,
3975 .nmi_allowed = vmx_nmi_allowed,
3976 .enable_nmi_window = enable_nmi_window,
3977 .enable_irq_window = enable_irq_window,
3978 .update_cr8_intercept = update_cr8_intercept,
3979
3980 .set_tss_addr = vmx_set_tss_addr,
3981 .get_tdp_level = get_ept_level,
3982 .get_mt_mask = vmx_get_mt_mask,
3983
3984 .exit_reasons_str = vmx_exit_reasons_str,
3985 .gb_page_enable = vmx_gb_page_enable,
3986 };
3987
3988 static int __init vmx_init(void)
3989 {
3990 int r;
3991
3992 vmx_io_bitmap_a = (unsigned long *)__get_free_page(GFP_KERNEL);
3993 if (!vmx_io_bitmap_a)
3994 return -ENOMEM;
3995
3996 vmx_io_bitmap_b = (unsigned long *)__get_free_page(GFP_KERNEL);
3997 if (!vmx_io_bitmap_b) {
3998 r = -ENOMEM;
3999 goto out;
4000 }
4001
4002 vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL);
4003 if (!vmx_msr_bitmap_legacy) {
4004 r = -ENOMEM;
4005 goto out1;
4006 }
4007
4008 vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL);
4009 if (!vmx_msr_bitmap_longmode) {
4010 r = -ENOMEM;
4011 goto out2;
4012 }
4013
4014 /*
4015 * Allow direct access to the PC debug port (it is often used for I/O
4016 * delays, but the vmexits simply slow things down).
4017 */
4018 memset(vmx_io_bitmap_a, 0xff, PAGE_SIZE);
4019 clear_bit(0x80, vmx_io_bitmap_a);
4020
4021 memset(vmx_io_bitmap_b, 0xff, PAGE_SIZE);
4022
4023 memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE);
4024 memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE);
4025
4026 set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */
4027
4028 r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), THIS_MODULE);
4029 if (r)
4030 goto out3;
4031
4032 vmx_disable_intercept_for_msr(MSR_FS_BASE, false);
4033 vmx_disable_intercept_for_msr(MSR_GS_BASE, false);
4034 vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true);
4035 vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false);
4036 vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false);
4037 vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
4038
4039 if (enable_ept) {
4040 bypass_guest_pf = 0;
4041 kvm_mmu_set_base_ptes(VMX_EPT_READABLE_MASK |
4042 VMX_EPT_WRITABLE_MASK);
4043 kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull,
4044 VMX_EPT_EXECUTABLE_MASK);
4045 kvm_enable_tdp();
4046 } else
4047 kvm_disable_tdp();
4048
4049 if (bypass_guest_pf)
4050 kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull);
4051
4052 ept_sync_global();
4053
4054 return 0;
4055
4056 out3:
4057 free_page((unsigned long)vmx_msr_bitmap_longmode);
4058 out2:
4059 free_page((unsigned long)vmx_msr_bitmap_legacy);
4060 out1:
4061 free_page((unsigned long)vmx_io_bitmap_b);
4062 out:
4063 free_page((unsigned long)vmx_io_bitmap_a);
4064 return r;
4065 }
4066
4067 static void __exit vmx_exit(void)
4068 {
4069 free_page((unsigned long)vmx_msr_bitmap_legacy);
4070 free_page((unsigned long)vmx_msr_bitmap_longmode);
4071 free_page((unsigned long)vmx_io_bitmap_b);
4072 free_page((unsigned long)vmx_io_bitmap_a);
4073
4074 kvm_exit();
4075 }
4076
4077 module_init(vmx_init)
4078 module_exit(vmx_exit)
Linux for Ginger Game Console