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Merge branch 'cleanup' into release
[mirror_ubuntu-bionic-kernel.git] / arch / x86 / kvm / svm.c
1 /*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * AMD SVM support
5 *
6 * Copyright (C) 2006 Qumranet, Inc.
7 * Copyright 2010 Red Hat, Inc. and/or its affilates.
8 *
9 * Authors:
10 * Yaniv Kamay <yaniv@qumranet.com>
11 * Avi Kivity <avi@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 #include <linux/kvm_host.h>
18
19 #include "irq.h"
20 #include "mmu.h"
21 #include "kvm_cache_regs.h"
22 #include "x86.h"
23
24 #include <linux/module.h>
25 #include <linux/kernel.h>
26 #include <linux/vmalloc.h>
27 #include <linux/highmem.h>
28 #include <linux/sched.h>
29 #include <linux/ftrace_event.h>
30 #include <linux/slab.h>
31
32 #include <asm/tlbflush.h>
33 #include <asm/desc.h>
34
35 #include <asm/virtext.h>
36 #include "trace.h"
37
38 #define __ex(x) __kvm_handle_fault_on_reboot(x)
39
40 MODULE_AUTHOR("Qumranet");
41 MODULE_LICENSE("GPL");
42
43 #define IOPM_ALLOC_ORDER 2
44 #define MSRPM_ALLOC_ORDER 1
45
46 #define SEG_TYPE_LDT 2
47 #define SEG_TYPE_BUSY_TSS16 3
48
49 #define SVM_FEATURE_NPT (1 << 0)
50 #define SVM_FEATURE_LBRV (1 << 1)
51 #define SVM_FEATURE_SVML (1 << 2)
52 #define SVM_FEATURE_NRIP (1 << 3)
53 #define SVM_FEATURE_PAUSE_FILTER (1 << 10)
54
55 #define NESTED_EXIT_HOST 0 /* Exit handled on host level */
56 #define NESTED_EXIT_DONE 1 /* Exit caused nested vmexit */
57 #define NESTED_EXIT_CONTINUE 2 /* Further checks needed */
58
59 #define DEBUGCTL_RESERVED_BITS (~(0x3fULL))
60
61 static bool erratum_383_found __read_mostly;
62
63 static const u32 host_save_user_msrs[] = {
64 #ifdef CONFIG_X86_64
65 MSR_STAR, MSR_LSTAR, MSR_CSTAR, MSR_SYSCALL_MASK, MSR_KERNEL_GS_BASE,
66 MSR_FS_BASE,
67 #endif
68 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
69 };
70
71 #define NR_HOST_SAVE_USER_MSRS ARRAY_SIZE(host_save_user_msrs)
72
73 struct kvm_vcpu;
74
75 struct nested_state {
76 struct vmcb *hsave;
77 u64 hsave_msr;
78 u64 vm_cr_msr;
79 u64 vmcb;
80
81 /* These are the merged vectors */
82 u32 *msrpm;
83
84 /* gpa pointers to the real vectors */
85 u64 vmcb_msrpm;
86 u64 vmcb_iopm;
87
88 /* A VMEXIT is required but not yet emulated */
89 bool exit_required;
90
91 /* cache for intercepts of the guest */
92 u16 intercept_cr_read;
93 u16 intercept_cr_write;
94 u16 intercept_dr_read;
95 u16 intercept_dr_write;
96 u32 intercept_exceptions;
97 u64 intercept;
98
99 };
100
101 #define MSRPM_OFFSETS 16
102 static u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
103
104 struct vcpu_svm {
105 struct kvm_vcpu vcpu;
106 struct vmcb *vmcb;
107 unsigned long vmcb_pa;
108 struct svm_cpu_data *svm_data;
109 uint64_t asid_generation;
110 uint64_t sysenter_esp;
111 uint64_t sysenter_eip;
112
113 u64 next_rip;
114
115 u64 host_user_msrs[NR_HOST_SAVE_USER_MSRS];
116 u64 host_gs_base;
117
118 u32 *msrpm;
119
120 struct nested_state nested;
121
122 bool nmi_singlestep;
123
124 unsigned int3_injected;
125 unsigned long int3_rip;
126 };
127
128 #define MSR_INVALID 0xffffffffU
129
130 static struct svm_direct_access_msrs {
131 u32 index; /* Index of the MSR */
132 bool always; /* True if intercept is always on */
133 } direct_access_msrs[] = {
134 { .index = MSR_STAR, .always = true },
135 { .index = MSR_IA32_SYSENTER_CS, .always = true },
136 #ifdef CONFIG_X86_64
137 { .index = MSR_GS_BASE, .always = true },
138 { .index = MSR_FS_BASE, .always = true },
139 { .index = MSR_KERNEL_GS_BASE, .always = true },
140 { .index = MSR_LSTAR, .always = true },
141 { .index = MSR_CSTAR, .always = true },
142 { .index = MSR_SYSCALL_MASK, .always = true },
143 #endif
144 { .index = MSR_IA32_LASTBRANCHFROMIP, .always = false },
145 { .index = MSR_IA32_LASTBRANCHTOIP, .always = false },
146 { .index = MSR_IA32_LASTINTFROMIP, .always = false },
147 { .index = MSR_IA32_LASTINTTOIP, .always = false },
148 { .index = MSR_INVALID, .always = false },
149 };
150
151 /* enable NPT for AMD64 and X86 with PAE */
152 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
153 static bool npt_enabled = true;
154 #else
155 static bool npt_enabled;
156 #endif
157 static int npt = 1;
158
159 module_param(npt, int, S_IRUGO);
160
161 static int nested = 1;
162 module_param(nested, int, S_IRUGO);
163
164 static void svm_flush_tlb(struct kvm_vcpu *vcpu);
165 static void svm_complete_interrupts(struct vcpu_svm *svm);
166
167 static int nested_svm_exit_handled(struct vcpu_svm *svm);
168 static int nested_svm_intercept(struct vcpu_svm *svm);
169 static int nested_svm_vmexit(struct vcpu_svm *svm);
170 static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
171 bool has_error_code, u32 error_code);
172
173 static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu)
174 {
175 return container_of(vcpu, struct vcpu_svm, vcpu);
176 }
177
178 static inline bool is_nested(struct vcpu_svm *svm)
179 {
180 return svm->nested.vmcb;
181 }
182
183 static inline void enable_gif(struct vcpu_svm *svm)
184 {
185 svm->vcpu.arch.hflags |= HF_GIF_MASK;
186 }
187
188 static inline void disable_gif(struct vcpu_svm *svm)
189 {
190 svm->vcpu.arch.hflags &= ~HF_GIF_MASK;
191 }
192
193 static inline bool gif_set(struct vcpu_svm *svm)
194 {
195 return !!(svm->vcpu.arch.hflags & HF_GIF_MASK);
196 }
197
198 static unsigned long iopm_base;
199
200 struct kvm_ldttss_desc {
201 u16 limit0;
202 u16 base0;
203 unsigned base1:8, type:5, dpl:2, p:1;
204 unsigned limit1:4, zero0:3, g:1, base2:8;
205 u32 base3;
206 u32 zero1;
207 } __attribute__((packed));
208
209 struct svm_cpu_data {
210 int cpu;
211
212 u64 asid_generation;
213 u32 max_asid;
214 u32 next_asid;
215 struct kvm_ldttss_desc *tss_desc;
216
217 struct page *save_area;
218 };
219
220 static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data);
221 static uint32_t svm_features;
222
223 struct svm_init_data {
224 int cpu;
225 int r;
226 };
227
228 static u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000};
229
230 #define NUM_MSR_MAPS ARRAY_SIZE(msrpm_ranges)
231 #define MSRS_RANGE_SIZE 2048
232 #define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2)
233
234 static u32 svm_msrpm_offset(u32 msr)
235 {
236 u32 offset;
237 int i;
238
239 for (i = 0; i < NUM_MSR_MAPS; i++) {
240 if (msr < msrpm_ranges[i] ||
241 msr >= msrpm_ranges[i] + MSRS_IN_RANGE)
242 continue;
243
244 offset = (msr - msrpm_ranges[i]) / 4; /* 4 msrs per u8 */
245 offset += (i * MSRS_RANGE_SIZE); /* add range offset */
246
247 /* Now we have the u8 offset - but need the u32 offset */
248 return offset / 4;
249 }
250
251 /* MSR not in any range */
252 return MSR_INVALID;
253 }
254
255 #define MAX_INST_SIZE 15
256
257 static inline u32 svm_has(u32 feat)
258 {
259 return svm_features & feat;
260 }
261
262 static inline void clgi(void)
263 {
264 asm volatile (__ex(SVM_CLGI));
265 }
266
267 static inline void stgi(void)
268 {
269 asm volatile (__ex(SVM_STGI));
270 }
271
272 static inline void invlpga(unsigned long addr, u32 asid)
273 {
274 asm volatile (__ex(SVM_INVLPGA) : : "a"(addr), "c"(asid));
275 }
276
277 static inline void force_new_asid(struct kvm_vcpu *vcpu)
278 {
279 to_svm(vcpu)->asid_generation--;
280 }
281
282 static inline void flush_guest_tlb(struct kvm_vcpu *vcpu)
283 {
284 force_new_asid(vcpu);
285 }
286
287 static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
288 {
289 vcpu->arch.efer = efer;
290 if (!npt_enabled && !(efer & EFER_LMA))
291 efer &= ~EFER_LME;
292
293 to_svm(vcpu)->vmcb->save.efer = efer | EFER_SVME;
294 }
295
296 static int is_external_interrupt(u32 info)
297 {
298 info &= SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID;
299 return info == (SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR);
300 }
301
302 static u32 svm_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
303 {
304 struct vcpu_svm *svm = to_svm(vcpu);
305 u32 ret = 0;
306
307 if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK)
308 ret |= KVM_X86_SHADOW_INT_STI | KVM_X86_SHADOW_INT_MOV_SS;
309 return ret & mask;
310 }
311
312 static void svm_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
313 {
314 struct vcpu_svm *svm = to_svm(vcpu);
315
316 if (mask == 0)
317 svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK;
318 else
319 svm->vmcb->control.int_state |= SVM_INTERRUPT_SHADOW_MASK;
320
321 }
322
323 static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
324 {
325 struct vcpu_svm *svm = to_svm(vcpu);
326
327 if (svm->vmcb->control.next_rip != 0)
328 svm->next_rip = svm->vmcb->control.next_rip;
329
330 if (!svm->next_rip) {
331 if (emulate_instruction(vcpu, 0, 0, EMULTYPE_SKIP) !=
332 EMULATE_DONE)
333 printk(KERN_DEBUG "%s: NOP\n", __func__);
334 return;
335 }
336 if (svm->next_rip - kvm_rip_read(vcpu) > MAX_INST_SIZE)
337 printk(KERN_ERR "%s: ip 0x%lx next 0x%llx\n",
338 __func__, kvm_rip_read(vcpu), svm->next_rip);
339
340 kvm_rip_write(vcpu, svm->next_rip);
341 svm_set_interrupt_shadow(vcpu, 0);
342 }
343
344 static void svm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
345 bool has_error_code, u32 error_code,
346 bool reinject)
347 {
348 struct vcpu_svm *svm = to_svm(vcpu);
349
350 /*
351 * If we are within a nested VM we'd better #VMEXIT and let the guest
352 * handle the exception
353 */
354 if (!reinject &&
355 nested_svm_check_exception(svm, nr, has_error_code, error_code))
356 return;
357
358 if (nr == BP_VECTOR && !svm_has(SVM_FEATURE_NRIP)) {
359 unsigned long rip, old_rip = kvm_rip_read(&svm->vcpu);
360
361 /*
362 * For guest debugging where we have to reinject #BP if some
363 * INT3 is guest-owned:
364 * Emulate nRIP by moving RIP forward. Will fail if injection
365 * raises a fault that is not intercepted. Still better than
366 * failing in all cases.
367 */
368 skip_emulated_instruction(&svm->vcpu);
369 rip = kvm_rip_read(&svm->vcpu);
370 svm->int3_rip = rip + svm->vmcb->save.cs.base;
371 svm->int3_injected = rip - old_rip;
372 }
373
374 svm->vmcb->control.event_inj = nr
375 | SVM_EVTINJ_VALID
376 | (has_error_code ? SVM_EVTINJ_VALID_ERR : 0)
377 | SVM_EVTINJ_TYPE_EXEPT;
378 svm->vmcb->control.event_inj_err = error_code;
379 }
380
381 static void svm_init_erratum_383(void)
382 {
383 u32 low, high;
384 int err;
385 u64 val;
386
387 if (!cpu_has_amd_erratum(amd_erratum_383))
388 return;
389
390 /* Use _safe variants to not break nested virtualization */
391 val = native_read_msr_safe(MSR_AMD64_DC_CFG, &err);
392 if (err)
393 return;
394
395 val |= (1ULL << 47);
396
397 low = lower_32_bits(val);
398 high = upper_32_bits(val);
399
400 native_write_msr_safe(MSR_AMD64_DC_CFG, low, high);
401
402 erratum_383_found = true;
403 }
404
405 static int has_svm(void)
406 {
407 const char *msg;
408
409 if (!cpu_has_svm(&msg)) {
410 printk(KERN_INFO "has_svm: %s\n", msg);
411 return 0;
412 }
413
414 return 1;
415 }
416
417 static void svm_hardware_disable(void *garbage)
418 {
419 cpu_svm_disable();
420 }
421
422 static int svm_hardware_enable(void *garbage)
423 {
424
425 struct svm_cpu_data *sd;
426 uint64_t efer;
427 struct desc_ptr gdt_descr;
428 struct desc_struct *gdt;
429 int me = raw_smp_processor_id();
430
431 rdmsrl(MSR_EFER, efer);
432 if (efer & EFER_SVME)
433 return -EBUSY;
434
435 if (!has_svm()) {
436 printk(KERN_ERR "svm_hardware_enable: err EOPNOTSUPP on %d\n",
437 me);
438 return -EINVAL;
439 }
440 sd = per_cpu(svm_data, me);
441
442 if (!sd) {
443 printk(KERN_ERR "svm_hardware_enable: svm_data is NULL on %d\n",
444 me);
445 return -EINVAL;
446 }
447
448 sd->asid_generation = 1;
449 sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1;
450 sd->next_asid = sd->max_asid + 1;
451
452 native_store_gdt(&gdt_descr);
453 gdt = (struct desc_struct *)gdt_descr.address;
454 sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
455
456 wrmsrl(MSR_EFER, efer | EFER_SVME);
457
458 wrmsrl(MSR_VM_HSAVE_PA, page_to_pfn(sd->save_area) << PAGE_SHIFT);
459
460 svm_init_erratum_383();
461
462 return 0;
463 }
464
465 static void svm_cpu_uninit(int cpu)
466 {
467 struct svm_cpu_data *sd = per_cpu(svm_data, raw_smp_processor_id());
468
469 if (!sd)
470 return;
471
472 per_cpu(svm_data, raw_smp_processor_id()) = NULL;
473 __free_page(sd->save_area);
474 kfree(sd);
475 }
476
477 static int svm_cpu_init(int cpu)
478 {
479 struct svm_cpu_data *sd;
480 int r;
481
482 sd = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL);
483 if (!sd)
484 return -ENOMEM;
485 sd->cpu = cpu;
486 sd->save_area = alloc_page(GFP_KERNEL);
487 r = -ENOMEM;
488 if (!sd->save_area)
489 goto err_1;
490
491 per_cpu(svm_data, cpu) = sd;
492
493 return 0;
494
495 err_1:
496 kfree(sd);
497 return r;
498
499 }
500
501 static bool valid_msr_intercept(u32 index)
502 {
503 int i;
504
505 for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++)
506 if (direct_access_msrs[i].index == index)
507 return true;
508
509 return false;
510 }
511
512 static void set_msr_interception(u32 *msrpm, unsigned msr,
513 int read, int write)
514 {
515 u8 bit_read, bit_write;
516 unsigned long tmp;
517 u32 offset;
518
519 /*
520 * If this warning triggers extend the direct_access_msrs list at the
521 * beginning of the file
522 */
523 WARN_ON(!valid_msr_intercept(msr));
524
525 offset = svm_msrpm_offset(msr);
526 bit_read = 2 * (msr & 0x0f);
527 bit_write = 2 * (msr & 0x0f) + 1;
528 tmp = msrpm[offset];
529
530 BUG_ON(offset == MSR_INVALID);
531
532 read ? clear_bit(bit_read, &tmp) : set_bit(bit_read, &tmp);
533 write ? clear_bit(bit_write, &tmp) : set_bit(bit_write, &tmp);
534
535 msrpm[offset] = tmp;
536 }
537
538 static void svm_vcpu_init_msrpm(u32 *msrpm)
539 {
540 int i;
541
542 memset(msrpm, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER));
543
544 for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
545 if (!direct_access_msrs[i].always)
546 continue;
547
548 set_msr_interception(msrpm, direct_access_msrs[i].index, 1, 1);
549 }
550 }
551
552 static void add_msr_offset(u32 offset)
553 {
554 int i;
555
556 for (i = 0; i < MSRPM_OFFSETS; ++i) {
557
558 /* Offset already in list? */
559 if (msrpm_offsets[i] == offset)
560 return;
561
562 /* Slot used by another offset? */
563 if (msrpm_offsets[i] != MSR_INVALID)
564 continue;
565
566 /* Add offset to list */
567 msrpm_offsets[i] = offset;
568
569 return;
570 }
571
572 /*
573 * If this BUG triggers the msrpm_offsets table has an overflow. Just
574 * increase MSRPM_OFFSETS in this case.
575 */
576 BUG();
577 }
578
579 static void init_msrpm_offsets(void)
580 {
581 int i;
582
583 memset(msrpm_offsets, 0xff, sizeof(msrpm_offsets));
584
585 for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
586 u32 offset;
587
588 offset = svm_msrpm_offset(direct_access_msrs[i].index);
589 BUG_ON(offset == MSR_INVALID);
590
591 add_msr_offset(offset);
592 }
593 }
594
595 static void svm_enable_lbrv(struct vcpu_svm *svm)
596 {
597 u32 *msrpm = svm->msrpm;
598
599 svm->vmcb->control.lbr_ctl = 1;
600 set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
601 set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
602 set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
603 set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
604 }
605
606 static void svm_disable_lbrv(struct vcpu_svm *svm)
607 {
608 u32 *msrpm = svm->msrpm;
609
610 svm->vmcb->control.lbr_ctl = 0;
611 set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
612 set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
613 set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 0, 0);
614 set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
615 }
616
617 static __init int svm_hardware_setup(void)
618 {
619 int cpu;
620 struct page *iopm_pages;
621 void *iopm_va;
622 int r;
623
624 iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER);
625
626 if (!iopm_pages)
627 return -ENOMEM;
628
629 iopm_va = page_address(iopm_pages);
630 memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
631 iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;
632
633 init_msrpm_offsets();
634
635 if (boot_cpu_has(X86_FEATURE_NX))
636 kvm_enable_efer_bits(EFER_NX);
637
638 if (boot_cpu_has(X86_FEATURE_FXSR_OPT))
639 kvm_enable_efer_bits(EFER_FFXSR);
640
641 if (nested) {
642 printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
643 kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE);
644 }
645
646 for_each_possible_cpu(cpu) {
647 r = svm_cpu_init(cpu);
648 if (r)
649 goto err;
650 }
651
652 svm_features = cpuid_edx(SVM_CPUID_FUNC);
653
654 if (!svm_has(SVM_FEATURE_NPT))
655 npt_enabled = false;
656
657 if (npt_enabled && !npt) {
658 printk(KERN_INFO "kvm: Nested Paging disabled\n");
659 npt_enabled = false;
660 }
661
662 if (npt_enabled) {
663 printk(KERN_INFO "kvm: Nested Paging enabled\n");
664 kvm_enable_tdp();
665 } else
666 kvm_disable_tdp();
667
668 return 0;
669
670 err:
671 __free_pages(iopm_pages, IOPM_ALLOC_ORDER);
672 iopm_base = 0;
673 return r;
674 }
675
676 static __exit void svm_hardware_unsetup(void)
677 {
678 int cpu;
679
680 for_each_possible_cpu(cpu)
681 svm_cpu_uninit(cpu);
682
683 __free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
684 iopm_base = 0;
685 }
686
687 static void init_seg(struct vmcb_seg *seg)
688 {
689 seg->selector = 0;
690 seg->attrib = SVM_SELECTOR_P_MASK | SVM_SELECTOR_S_MASK |
691 SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */
692 seg->limit = 0xffff;
693 seg->base = 0;
694 }
695
696 static void init_sys_seg(struct vmcb_seg *seg, uint32_t type)
697 {
698 seg->selector = 0;
699 seg->attrib = SVM_SELECTOR_P_MASK | type;
700 seg->limit = 0xffff;
701 seg->base = 0;
702 }
703
704 static void init_vmcb(struct vcpu_svm *svm)
705 {
706 struct vmcb_control_area *control = &svm->vmcb->control;
707 struct vmcb_save_area *save = &svm->vmcb->save;
708
709 svm->vcpu.fpu_active = 1;
710
711 control->intercept_cr_read = INTERCEPT_CR0_MASK |
712 INTERCEPT_CR3_MASK |
713 INTERCEPT_CR4_MASK;
714
715 control->intercept_cr_write = INTERCEPT_CR0_MASK |
716 INTERCEPT_CR3_MASK |
717 INTERCEPT_CR4_MASK |
718 INTERCEPT_CR8_MASK;
719
720 control->intercept_dr_read = INTERCEPT_DR0_MASK |
721 INTERCEPT_DR1_MASK |
722 INTERCEPT_DR2_MASK |
723 INTERCEPT_DR3_MASK |
724 INTERCEPT_DR4_MASK |
725 INTERCEPT_DR5_MASK |
726 INTERCEPT_DR6_MASK |
727 INTERCEPT_DR7_MASK;
728
729 control->intercept_dr_write = INTERCEPT_DR0_MASK |
730 INTERCEPT_DR1_MASK |
731 INTERCEPT_DR2_MASK |
732 INTERCEPT_DR3_MASK |
733 INTERCEPT_DR4_MASK |
734 INTERCEPT_DR5_MASK |
735 INTERCEPT_DR6_MASK |
736 INTERCEPT_DR7_MASK;
737
738 control->intercept_exceptions = (1 << PF_VECTOR) |
739 (1 << UD_VECTOR) |
740 (1 << MC_VECTOR);
741
742
743 control->intercept = (1ULL << INTERCEPT_INTR) |
744 (1ULL << INTERCEPT_NMI) |
745 (1ULL << INTERCEPT_SMI) |
746 (1ULL << INTERCEPT_SELECTIVE_CR0) |
747 (1ULL << INTERCEPT_CPUID) |
748 (1ULL << INTERCEPT_INVD) |
749 (1ULL << INTERCEPT_HLT) |
750 (1ULL << INTERCEPT_INVLPG) |
751 (1ULL << INTERCEPT_INVLPGA) |
752 (1ULL << INTERCEPT_IOIO_PROT) |
753 (1ULL << INTERCEPT_MSR_PROT) |
754 (1ULL << INTERCEPT_TASK_SWITCH) |
755 (1ULL << INTERCEPT_SHUTDOWN) |
756 (1ULL << INTERCEPT_VMRUN) |
757 (1ULL << INTERCEPT_VMMCALL) |
758 (1ULL << INTERCEPT_VMLOAD) |
759 (1ULL << INTERCEPT_VMSAVE) |
760 (1ULL << INTERCEPT_STGI) |
761 (1ULL << INTERCEPT_CLGI) |
762 (1ULL << INTERCEPT_SKINIT) |
763 (1ULL << INTERCEPT_WBINVD) |
764 (1ULL << INTERCEPT_MONITOR) |
765 (1ULL << INTERCEPT_MWAIT);
766
767 control->iopm_base_pa = iopm_base;
768 control->msrpm_base_pa = __pa(svm->msrpm);
769 control->int_ctl = V_INTR_MASKING_MASK;
770
771 init_seg(&save->es);
772 init_seg(&save->ss);
773 init_seg(&save->ds);
774 init_seg(&save->fs);
775 init_seg(&save->gs);
776
777 save->cs.selector = 0xf000;
778 /* Executable/Readable Code Segment */
779 save->cs.attrib = SVM_SELECTOR_READ_MASK | SVM_SELECTOR_P_MASK |
780 SVM_SELECTOR_S_MASK | SVM_SELECTOR_CODE_MASK;
781 save->cs.limit = 0xffff;
782 /*
783 * cs.base should really be 0xffff0000, but vmx can't handle that, so
784 * be consistent with it.
785 *
786 * Replace when we have real mode working for vmx.
787 */
788 save->cs.base = 0xf0000;
789
790 save->gdtr.limit = 0xffff;
791 save->idtr.limit = 0xffff;
792
793 init_sys_seg(&save->ldtr, SEG_TYPE_LDT);
794 init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16);
795
796 save->efer = EFER_SVME;
797 save->dr6 = 0xffff0ff0;
798 save->dr7 = 0x400;
799 save->rflags = 2;
800 save->rip = 0x0000fff0;
801 svm->vcpu.arch.regs[VCPU_REGS_RIP] = save->rip;
802
803 /*
804 * This is the guest-visible cr0 value.
805 * svm_set_cr0() sets PG and WP and clears NW and CD on save->cr0.
806 */
807 svm->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET;
808 (void)kvm_set_cr0(&svm->vcpu, svm->vcpu.arch.cr0);
809
810 save->cr4 = X86_CR4_PAE;
811 /* rdx = ?? */
812
813 if (npt_enabled) {
814 /* Setup VMCB for Nested Paging */
815 control->nested_ctl = 1;
816 control->intercept &= ~((1ULL << INTERCEPT_TASK_SWITCH) |
817 (1ULL << INTERCEPT_INVLPG));
818 control->intercept_exceptions &= ~(1 << PF_VECTOR);
819 control->intercept_cr_read &= ~INTERCEPT_CR3_MASK;
820 control->intercept_cr_write &= ~INTERCEPT_CR3_MASK;
821 save->g_pat = 0x0007040600070406ULL;
822 save->cr3 = 0;
823 save->cr4 = 0;
824 }
825 force_new_asid(&svm->vcpu);
826
827 svm->nested.vmcb = 0;
828 svm->vcpu.arch.hflags = 0;
829
830 if (svm_has(SVM_FEATURE_PAUSE_FILTER)) {
831 control->pause_filter_count = 3000;
832 control->intercept |= (1ULL << INTERCEPT_PAUSE);
833 }
834
835 enable_gif(svm);
836 }
837
838 static int svm_vcpu_reset(struct kvm_vcpu *vcpu)
839 {
840 struct vcpu_svm *svm = to_svm(vcpu);
841
842 init_vmcb(svm);
843
844 if (!kvm_vcpu_is_bsp(vcpu)) {
845 kvm_rip_write(vcpu, 0);
846 svm->vmcb->save.cs.base = svm->vcpu.arch.sipi_vector << 12;
847 svm->vmcb->save.cs.selector = svm->vcpu.arch.sipi_vector << 8;
848 }
849 vcpu->arch.regs_avail = ~0;
850 vcpu->arch.regs_dirty = ~0;
851
852 return 0;
853 }
854
855 static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
856 {
857 struct vcpu_svm *svm;
858 struct page *page;
859 struct page *msrpm_pages;
860 struct page *hsave_page;
861 struct page *nested_msrpm_pages;
862 int err;
863
864 svm = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
865 if (!svm) {
866 err = -ENOMEM;
867 goto out;
868 }
869
870 err = kvm_vcpu_init(&svm->vcpu, kvm, id);
871 if (err)
872 goto free_svm;
873
874 err = -ENOMEM;
875 page = alloc_page(GFP_KERNEL);
876 if (!page)
877 goto uninit;
878
879 msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
880 if (!msrpm_pages)
881 goto free_page1;
882
883 nested_msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
884 if (!nested_msrpm_pages)
885 goto free_page2;
886
887 hsave_page = alloc_page(GFP_KERNEL);
888 if (!hsave_page)
889 goto free_page3;
890
891 svm->nested.hsave = page_address(hsave_page);
892
893 svm->msrpm = page_address(msrpm_pages);
894 svm_vcpu_init_msrpm(svm->msrpm);
895
896 svm->nested.msrpm = page_address(nested_msrpm_pages);
897 svm_vcpu_init_msrpm(svm->nested.msrpm);
898
899 svm->vmcb = page_address(page);
900 clear_page(svm->vmcb);
901 svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT;
902 svm->asid_generation = 0;
903 init_vmcb(svm);
904 svm->vmcb->control.tsc_offset = 0-native_read_tsc();
905
906 err = fx_init(&svm->vcpu);
907 if (err)
908 goto free_page4;
909
910 svm->vcpu.arch.apic_base = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
911 if (kvm_vcpu_is_bsp(&svm->vcpu))
912 svm->vcpu.arch.apic_base |= MSR_IA32_APICBASE_BSP;
913
914 return &svm->vcpu;
915
916 free_page4:
917 __free_page(hsave_page);
918 free_page3:
919 __free_pages(nested_msrpm_pages, MSRPM_ALLOC_ORDER);
920 free_page2:
921 __free_pages(msrpm_pages, MSRPM_ALLOC_ORDER);
922 free_page1:
923 __free_page(page);
924 uninit:
925 kvm_vcpu_uninit(&svm->vcpu);
926 free_svm:
927 kmem_cache_free(kvm_vcpu_cache, svm);
928 out:
929 return ERR_PTR(err);
930 }
931
932 static void svm_free_vcpu(struct kvm_vcpu *vcpu)
933 {
934 struct vcpu_svm *svm = to_svm(vcpu);
935
936 __free_page(pfn_to_page(svm->vmcb_pa >> PAGE_SHIFT));
937 __free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
938 __free_page(virt_to_page(svm->nested.hsave));
939 __free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER);
940 kvm_vcpu_uninit(vcpu);
941 kmem_cache_free(kvm_vcpu_cache, svm);
942 }
943
944 static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
945 {
946 struct vcpu_svm *svm = to_svm(vcpu);
947 int i;
948
949 if (unlikely(cpu != vcpu->cpu)) {
950 u64 delta;
951
952 if (check_tsc_unstable()) {
953 /*
954 * Make sure that the guest sees a monotonically
955 * increasing TSC.
956 */
957 delta = vcpu->arch.host_tsc - native_read_tsc();
958 svm->vmcb->control.tsc_offset += delta;
959 if (is_nested(svm))
960 svm->nested.hsave->control.tsc_offset += delta;
961 }
962 vcpu->cpu = cpu;
963 kvm_migrate_timers(vcpu);
964 svm->asid_generation = 0;
965 }
966
967 for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
968 rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
969 }
970
971 static void svm_vcpu_put(struct kvm_vcpu *vcpu)
972 {
973 struct vcpu_svm *svm = to_svm(vcpu);
974 int i;
975
976 ++vcpu->stat.host_state_reload;
977 for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
978 wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
979
980 vcpu->arch.host_tsc = native_read_tsc();
981 }
982
983 static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu)
984 {
985 return to_svm(vcpu)->vmcb->save.rflags;
986 }
987
988 static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
989 {
990 to_svm(vcpu)->vmcb->save.rflags = rflags;
991 }
992
993 static void svm_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
994 {
995 switch (reg) {
996 case VCPU_EXREG_PDPTR:
997 BUG_ON(!npt_enabled);
998 load_pdptrs(vcpu, vcpu->arch.cr3);
999 break;
1000 default:
1001 BUG();
1002 }
1003 }
1004
1005 static void svm_set_vintr(struct vcpu_svm *svm)
1006 {
1007 svm->vmcb->control.intercept |= 1ULL << INTERCEPT_VINTR;
1008 }
1009
1010 static void svm_clear_vintr(struct vcpu_svm *svm)
1011 {
1012 svm->vmcb->control.intercept &= ~(1ULL << INTERCEPT_VINTR);
1013 }
1014
1015 static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg)
1016 {
1017 struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
1018
1019 switch (seg) {
1020 case VCPU_SREG_CS: return &save->cs;
1021 case VCPU_SREG_DS: return &save->ds;
1022 case VCPU_SREG_ES: return &save->es;
1023 case VCPU_SREG_FS: return &save->fs;
1024 case VCPU_SREG_GS: return &save->gs;
1025 case VCPU_SREG_SS: return &save->ss;
1026 case VCPU_SREG_TR: return &save->tr;
1027 case VCPU_SREG_LDTR: return &save->ldtr;
1028 }
1029 BUG();
1030 return NULL;
1031 }
1032
1033 static u64 svm_get_segment_base(struct kvm_vcpu *vcpu, int seg)
1034 {
1035 struct vmcb_seg *s = svm_seg(vcpu, seg);
1036
1037 return s->base;
1038 }
1039
1040 static void svm_get_segment(struct kvm_vcpu *vcpu,
1041 struct kvm_segment *var, int seg)
1042 {
1043 struct vmcb_seg *s = svm_seg(vcpu, seg);
1044
1045 var->base = s->base;
1046 var->limit = s->limit;
1047 var->selector = s->selector;
1048 var->type = s->attrib & SVM_SELECTOR_TYPE_MASK;
1049 var->s = (s->attrib >> SVM_SELECTOR_S_SHIFT) & 1;
1050 var->dpl = (s->attrib >> SVM_SELECTOR_DPL_SHIFT) & 3;
1051 var->present = (s->attrib >> SVM_SELECTOR_P_SHIFT) & 1;
1052 var->avl = (s->attrib >> SVM_SELECTOR_AVL_SHIFT) & 1;
1053 var->l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1;
1054 var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;
1055 var->g = (s->attrib >> SVM_SELECTOR_G_SHIFT) & 1;
1056
1057 /*
1058 * AMD's VMCB does not have an explicit unusable field, so emulate it
1059 * for cross vendor migration purposes by "not present"
1060 */
1061 var->unusable = !var->present || (var->type == 0);
1062
1063 switch (seg) {
1064 case VCPU_SREG_CS:
1065 /*
1066 * SVM always stores 0 for the 'G' bit in the CS selector in
1067 * the VMCB on a VMEXIT. This hurts cross-vendor migration:
1068 * Intel's VMENTRY has a check on the 'G' bit.
1069 */
1070 var->g = s->limit > 0xfffff;
1071 break;
1072 case VCPU_SREG_TR:
1073 /*
1074 * Work around a bug where the busy flag in the tr selector
1075 * isn't exposed
1076 */
1077 var->type |= 0x2;
1078 break;
1079 case VCPU_SREG_DS:
1080 case VCPU_SREG_ES:
1081 case VCPU_SREG_FS:
1082 case VCPU_SREG_GS:
1083 /*
1084 * The accessed bit must always be set in the segment
1085 * descriptor cache, although it can be cleared in the
1086 * descriptor, the cached bit always remains at 1. Since
1087 * Intel has a check on this, set it here to support
1088 * cross-vendor migration.
1089 */
1090 if (!var->unusable)
1091 var->type |= 0x1;
1092 break;
1093 case VCPU_SREG_SS:
1094 /*
1095 * On AMD CPUs sometimes the DB bit in the segment
1096 * descriptor is left as 1, although the whole segment has
1097 * been made unusable. Clear it here to pass an Intel VMX
1098 * entry check when cross vendor migrating.
1099 */
1100 if (var->unusable)
1101 var->db = 0;
1102 break;
1103 }
1104 }
1105
1106 static int svm_get_cpl(struct kvm_vcpu *vcpu)
1107 {
1108 struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
1109
1110 return save->cpl;
1111 }
1112
1113 static void svm_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1114 {
1115 struct vcpu_svm *svm = to_svm(vcpu);
1116
1117 dt->size = svm->vmcb->save.idtr.limit;
1118 dt->address = svm->vmcb->save.idtr.base;
1119 }
1120
1121 static void svm_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1122 {
1123 struct vcpu_svm *svm = to_svm(vcpu);
1124
1125 svm->vmcb->save.idtr.limit = dt->size;
1126 svm->vmcb->save.idtr.base = dt->address ;
1127 }
1128
1129 static void svm_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1130 {
1131 struct vcpu_svm *svm = to_svm(vcpu);
1132
1133 dt->size = svm->vmcb->save.gdtr.limit;
1134 dt->address = svm->vmcb->save.gdtr.base;
1135 }
1136
1137 static void svm_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1138 {
1139 struct vcpu_svm *svm = to_svm(vcpu);
1140
1141 svm->vmcb->save.gdtr.limit = dt->size;
1142 svm->vmcb->save.gdtr.base = dt->address ;
1143 }
1144
1145 static void svm_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
1146 {
1147 }
1148
1149 static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
1150 {
1151 }
1152
1153 static void update_cr0_intercept(struct vcpu_svm *svm)
1154 {
1155 struct vmcb *vmcb = svm->vmcb;
1156 ulong gcr0 = svm->vcpu.arch.cr0;
1157 u64 *hcr0 = &svm->vmcb->save.cr0;
1158
1159 if (!svm->vcpu.fpu_active)
1160 *hcr0 |= SVM_CR0_SELECTIVE_MASK;
1161 else
1162 *hcr0 = (*hcr0 & ~SVM_CR0_SELECTIVE_MASK)
1163 | (gcr0 & SVM_CR0_SELECTIVE_MASK);
1164
1165
1166 if (gcr0 == *hcr0 && svm->vcpu.fpu_active) {
1167 vmcb->control.intercept_cr_read &= ~INTERCEPT_CR0_MASK;
1168 vmcb->control.intercept_cr_write &= ~INTERCEPT_CR0_MASK;
1169 if (is_nested(svm)) {
1170 struct vmcb *hsave = svm->nested.hsave;
1171
1172 hsave->control.intercept_cr_read &= ~INTERCEPT_CR0_MASK;
1173 hsave->control.intercept_cr_write &= ~INTERCEPT_CR0_MASK;
1174 vmcb->control.intercept_cr_read |= svm->nested.intercept_cr_read;
1175 vmcb->control.intercept_cr_write |= svm->nested.intercept_cr_write;
1176 }
1177 } else {
1178 svm->vmcb->control.intercept_cr_read |= INTERCEPT_CR0_MASK;
1179 svm->vmcb->control.intercept_cr_write |= INTERCEPT_CR0_MASK;
1180 if (is_nested(svm)) {
1181 struct vmcb *hsave = svm->nested.hsave;
1182
1183 hsave->control.intercept_cr_read |= INTERCEPT_CR0_MASK;
1184 hsave->control.intercept_cr_write |= INTERCEPT_CR0_MASK;
1185 }
1186 }
1187 }
1188
1189 static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
1190 {
1191 struct vcpu_svm *svm = to_svm(vcpu);
1192
1193 if (is_nested(svm)) {
1194 /*
1195 * We are here because we run in nested mode, the host kvm
1196 * intercepts cr0 writes but the l1 hypervisor does not.
1197 * But the L1 hypervisor may intercept selective cr0 writes.
1198 * This needs to be checked here.
1199 */
1200 unsigned long old, new;
1201
1202 /* Remove bits that would trigger a real cr0 write intercept */
1203 old = vcpu->arch.cr0 & SVM_CR0_SELECTIVE_MASK;
1204 new = cr0 & SVM_CR0_SELECTIVE_MASK;
1205
1206 if (old == new) {
1207 /* cr0 write with ts and mp unchanged */
1208 svm->vmcb->control.exit_code = SVM_EXIT_CR0_SEL_WRITE;
1209 if (nested_svm_exit_handled(svm) == NESTED_EXIT_DONE)
1210 return;
1211 }
1212 }
1213
1214 #ifdef CONFIG_X86_64
1215 if (vcpu->arch.efer & EFER_LME) {
1216 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
1217 vcpu->arch.efer |= EFER_LMA;
1218 svm->vmcb->save.efer |= EFER_LMA | EFER_LME;
1219 }
1220
1221 if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) {
1222 vcpu->arch.efer &= ~EFER_LMA;
1223 svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME);
1224 }
1225 }
1226 #endif
1227 vcpu->arch.cr0 = cr0;
1228
1229 if (!npt_enabled)
1230 cr0 |= X86_CR0_PG | X86_CR0_WP;
1231
1232 if (!vcpu->fpu_active)
1233 cr0 |= X86_CR0_TS;
1234 /*
1235 * re-enable caching here because the QEMU bios
1236 * does not do it - this results in some delay at
1237 * reboot
1238 */
1239 cr0 &= ~(X86_CR0_CD | X86_CR0_NW);
1240 svm->vmcb->save.cr0 = cr0;
1241 update_cr0_intercept(svm);
1242 }
1243
1244 static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
1245 {
1246 unsigned long host_cr4_mce = read_cr4() & X86_CR4_MCE;
1247 unsigned long old_cr4 = to_svm(vcpu)->vmcb->save.cr4;
1248
1249 if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
1250 force_new_asid(vcpu);
1251
1252 vcpu->arch.cr4 = cr4;
1253 if (!npt_enabled)
1254 cr4 |= X86_CR4_PAE;
1255 cr4 |= host_cr4_mce;
1256 to_svm(vcpu)->vmcb->save.cr4 = cr4;
1257 }
1258
1259 static void svm_set_segment(struct kvm_vcpu *vcpu,
1260 struct kvm_segment *var, int seg)
1261 {
1262 struct vcpu_svm *svm = to_svm(vcpu);
1263 struct vmcb_seg *s = svm_seg(vcpu, seg);
1264
1265 s->base = var->base;
1266 s->limit = var->limit;
1267 s->selector = var->selector;
1268 if (var->unusable)
1269 s->attrib = 0;
1270 else {
1271 s->attrib = (var->type & SVM_SELECTOR_TYPE_MASK);
1272 s->attrib |= (var->s & 1) << SVM_SELECTOR_S_SHIFT;
1273 s->attrib |= (var->dpl & 3) << SVM_SELECTOR_DPL_SHIFT;
1274 s->attrib |= (var->present & 1) << SVM_SELECTOR_P_SHIFT;
1275 s->attrib |= (var->avl & 1) << SVM_SELECTOR_AVL_SHIFT;
1276 s->attrib |= (var->l & 1) << SVM_SELECTOR_L_SHIFT;
1277 s->attrib |= (var->db & 1) << SVM_SELECTOR_DB_SHIFT;
1278 s->attrib |= (var->g & 1) << SVM_SELECTOR_G_SHIFT;
1279 }
1280 if (seg == VCPU_SREG_CS)
1281 svm->vmcb->save.cpl
1282 = (svm->vmcb->save.cs.attrib
1283 >> SVM_SELECTOR_DPL_SHIFT) & 3;
1284
1285 }
1286
1287 static void update_db_intercept(struct kvm_vcpu *vcpu)
1288 {
1289 struct vcpu_svm *svm = to_svm(vcpu);
1290
1291 svm->vmcb->control.intercept_exceptions &=
1292 ~((1 << DB_VECTOR) | (1 << BP_VECTOR));
1293
1294 if (svm->nmi_singlestep)
1295 svm->vmcb->control.intercept_exceptions |= (1 << DB_VECTOR);
1296
1297 if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
1298 if (vcpu->guest_debug &
1299 (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
1300 svm->vmcb->control.intercept_exceptions |=
1301 1 << DB_VECTOR;
1302 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
1303 svm->vmcb->control.intercept_exceptions |=
1304 1 << BP_VECTOR;
1305 } else
1306 vcpu->guest_debug = 0;
1307 }
1308
1309 static void svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
1310 {
1311 struct vcpu_svm *svm = to_svm(vcpu);
1312
1313 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
1314 svm->vmcb->save.dr7 = dbg->arch.debugreg[7];
1315 else
1316 svm->vmcb->save.dr7 = vcpu->arch.dr7;
1317
1318 update_db_intercept(vcpu);
1319 }
1320
1321 static void load_host_msrs(struct kvm_vcpu *vcpu)
1322 {
1323 #ifdef CONFIG_X86_64
1324 wrmsrl(MSR_GS_BASE, to_svm(vcpu)->host_gs_base);
1325 #endif
1326 }
1327
1328 static void save_host_msrs(struct kvm_vcpu *vcpu)
1329 {
1330 #ifdef CONFIG_X86_64
1331 rdmsrl(MSR_GS_BASE, to_svm(vcpu)->host_gs_base);
1332 #endif
1333 }
1334
1335 static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd)
1336 {
1337 if (sd->next_asid > sd->max_asid) {
1338 ++sd->asid_generation;
1339 sd->next_asid = 1;
1340 svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;
1341 }
1342
1343 svm->asid_generation = sd->asid_generation;
1344 svm->vmcb->control.asid = sd->next_asid++;
1345 }
1346
1347 static void svm_set_dr7(struct kvm_vcpu *vcpu, unsigned long value)
1348 {
1349 struct vcpu_svm *svm = to_svm(vcpu);
1350
1351 svm->vmcb->save.dr7 = value;
1352 }
1353
1354 static int pf_interception(struct vcpu_svm *svm)
1355 {
1356 u64 fault_address;
1357 u32 error_code;
1358
1359 fault_address = svm->vmcb->control.exit_info_2;
1360 error_code = svm->vmcb->control.exit_info_1;
1361
1362 trace_kvm_page_fault(fault_address, error_code);
1363 if (!npt_enabled && kvm_event_needs_reinjection(&svm->vcpu))
1364 kvm_mmu_unprotect_page_virt(&svm->vcpu, fault_address);
1365 return kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code);
1366 }
1367
1368 static int db_interception(struct vcpu_svm *svm)
1369 {
1370 struct kvm_run *kvm_run = svm->vcpu.run;
1371
1372 if (!(svm->vcpu.guest_debug &
1373 (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) &&
1374 !svm->nmi_singlestep) {
1375 kvm_queue_exception(&svm->vcpu, DB_VECTOR);
1376 return 1;
1377 }
1378
1379 if (svm->nmi_singlestep) {
1380 svm->nmi_singlestep = false;
1381 if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP))
1382 svm->vmcb->save.rflags &=
1383 ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1384 update_db_intercept(&svm->vcpu);
1385 }
1386
1387 if (svm->vcpu.guest_debug &
1388 (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) {
1389 kvm_run->exit_reason = KVM_EXIT_DEBUG;
1390 kvm_run->debug.arch.pc =
1391 svm->vmcb->save.cs.base + svm->vmcb->save.rip;
1392 kvm_run->debug.arch.exception = DB_VECTOR;
1393 return 0;
1394 }
1395
1396 return 1;
1397 }
1398
1399 static int bp_interception(struct vcpu_svm *svm)
1400 {
1401 struct kvm_run *kvm_run = svm->vcpu.run;
1402
1403 kvm_run->exit_reason = KVM_EXIT_DEBUG;
1404 kvm_run->debug.arch.pc = svm->vmcb->save.cs.base + svm->vmcb->save.rip;
1405 kvm_run->debug.arch.exception = BP_VECTOR;
1406 return 0;
1407 }
1408
1409 static int ud_interception(struct vcpu_svm *svm)
1410 {
1411 int er;
1412
1413 er = emulate_instruction(&svm->vcpu, 0, 0, EMULTYPE_TRAP_UD);
1414 if (er != EMULATE_DONE)
1415 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
1416 return 1;
1417 }
1418
1419 static void svm_fpu_activate(struct kvm_vcpu *vcpu)
1420 {
1421 struct vcpu_svm *svm = to_svm(vcpu);
1422 u32 excp;
1423
1424 if (is_nested(svm)) {
1425 u32 h_excp, n_excp;
1426
1427 h_excp = svm->nested.hsave->control.intercept_exceptions;
1428 n_excp = svm->nested.intercept_exceptions;
1429 h_excp &= ~(1 << NM_VECTOR);
1430 excp = h_excp | n_excp;
1431 } else {
1432 excp = svm->vmcb->control.intercept_exceptions;
1433 excp &= ~(1 << NM_VECTOR);
1434 }
1435
1436 svm->vmcb->control.intercept_exceptions = excp;
1437
1438 svm->vcpu.fpu_active = 1;
1439 update_cr0_intercept(svm);
1440 }
1441
1442 static int nm_interception(struct vcpu_svm *svm)
1443 {
1444 svm_fpu_activate(&svm->vcpu);
1445 return 1;
1446 }
1447
1448 static bool is_erratum_383(void)
1449 {
1450 int err, i;
1451 u64 value;
1452
1453 if (!erratum_383_found)
1454 return false;
1455
1456 value = native_read_msr_safe(MSR_IA32_MC0_STATUS, &err);
1457 if (err)
1458 return false;
1459
1460 /* Bit 62 may or may not be set for this mce */
1461 value &= ~(1ULL << 62);
1462
1463 if (value != 0xb600000000010015ULL)
1464 return false;
1465
1466 /* Clear MCi_STATUS registers */
1467 for (i = 0; i < 6; ++i)
1468 native_write_msr_safe(MSR_IA32_MCx_STATUS(i), 0, 0);
1469
1470 value = native_read_msr_safe(MSR_IA32_MCG_STATUS, &err);
1471 if (!err) {
1472 u32 low, high;
1473
1474 value &= ~(1ULL << 2);
1475 low = lower_32_bits(value);
1476 high = upper_32_bits(value);
1477
1478 native_write_msr_safe(MSR_IA32_MCG_STATUS, low, high);
1479 }
1480
1481 /* Flush tlb to evict multi-match entries */
1482 __flush_tlb_all();
1483
1484 return true;
1485 }
1486
1487 static void svm_handle_mce(struct vcpu_svm *svm)
1488 {
1489 if (is_erratum_383()) {
1490 /*
1491 * Erratum 383 triggered. Guest state is corrupt so kill the
1492 * guest.
1493 */
1494 pr_err("KVM: Guest triggered AMD Erratum 383\n");
1495
1496 kvm_make_request(KVM_REQ_TRIPLE_FAULT, &svm->vcpu);
1497
1498 return;
1499 }
1500
1501 /*
1502 * On an #MC intercept the MCE handler is not called automatically in
1503 * the host. So do it by hand here.
1504 */
1505 asm volatile (
1506 "int $0x12\n");
1507 /* not sure if we ever come back to this point */
1508
1509 return;
1510 }
1511
1512 static int mc_interception(struct vcpu_svm *svm)
1513 {
1514 return 1;
1515 }
1516
1517 static int shutdown_interception(struct vcpu_svm *svm)
1518 {
1519 struct kvm_run *kvm_run = svm->vcpu.run;
1520
1521 /*
1522 * VMCB is undefined after a SHUTDOWN intercept
1523 * so reinitialize it.
1524 */
1525 clear_page(svm->vmcb);
1526 init_vmcb(svm);
1527
1528 kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
1529 return 0;
1530 }
1531
1532 static int io_interception(struct vcpu_svm *svm)
1533 {
1534 struct kvm_vcpu *vcpu = &svm->vcpu;
1535 u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
1536 int size, in, string;
1537 unsigned port;
1538
1539 ++svm->vcpu.stat.io_exits;
1540 string = (io_info & SVM_IOIO_STR_MASK) != 0;
1541 in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
1542 if (string || in)
1543 return emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DONE;
1544
1545 port = io_info >> 16;
1546 size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
1547 svm->next_rip = svm->vmcb->control.exit_info_2;
1548 skip_emulated_instruction(&svm->vcpu);
1549
1550 return kvm_fast_pio_out(vcpu, size, port);
1551 }
1552
1553 static int nmi_interception(struct vcpu_svm *svm)
1554 {
1555 return 1;
1556 }
1557
1558 static int intr_interception(struct vcpu_svm *svm)
1559 {
1560 ++svm->vcpu.stat.irq_exits;
1561 return 1;
1562 }
1563
1564 static int nop_on_interception(struct vcpu_svm *svm)
1565 {
1566 return 1;
1567 }
1568
1569 static int halt_interception(struct vcpu_svm *svm)
1570 {
1571 svm->next_rip = kvm_rip_read(&svm->vcpu) + 1;
1572 skip_emulated_instruction(&svm->vcpu);
1573 return kvm_emulate_halt(&svm->vcpu);
1574 }
1575
1576 static int vmmcall_interception(struct vcpu_svm *svm)
1577 {
1578 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
1579 skip_emulated_instruction(&svm->vcpu);
1580 kvm_emulate_hypercall(&svm->vcpu);
1581 return 1;
1582 }
1583
1584 static int nested_svm_check_permissions(struct vcpu_svm *svm)
1585 {
1586 if (!(svm->vcpu.arch.efer & EFER_SVME)
1587 || !is_paging(&svm->vcpu)) {
1588 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
1589 return 1;
1590 }
1591
1592 if (svm->vmcb->save.cpl) {
1593 kvm_inject_gp(&svm->vcpu, 0);
1594 return 1;
1595 }
1596
1597 return 0;
1598 }
1599
1600 static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
1601 bool has_error_code, u32 error_code)
1602 {
1603 int vmexit;
1604
1605 if (!is_nested(svm))
1606 return 0;
1607
1608 svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr;
1609 svm->vmcb->control.exit_code_hi = 0;
1610 svm->vmcb->control.exit_info_1 = error_code;
1611 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
1612
1613 vmexit = nested_svm_intercept(svm);
1614 if (vmexit == NESTED_EXIT_DONE)
1615 svm->nested.exit_required = true;
1616
1617 return vmexit;
1618 }
1619
1620 /* This function returns true if it is save to enable the irq window */
1621 static inline bool nested_svm_intr(struct vcpu_svm *svm)
1622 {
1623 if (!is_nested(svm))
1624 return true;
1625
1626 if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
1627 return true;
1628
1629 if (!(svm->vcpu.arch.hflags & HF_HIF_MASK))
1630 return false;
1631
1632 svm->vmcb->control.exit_code = SVM_EXIT_INTR;
1633 svm->vmcb->control.exit_info_1 = 0;
1634 svm->vmcb->control.exit_info_2 = 0;
1635
1636 if (svm->nested.intercept & 1ULL) {
1637 /*
1638 * The #vmexit can't be emulated here directly because this
1639 * code path runs with irqs and preemtion disabled. A
1640 * #vmexit emulation might sleep. Only signal request for
1641 * the #vmexit here.
1642 */
1643 svm->nested.exit_required = true;
1644 trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
1645 return false;
1646 }
1647
1648 return true;
1649 }
1650
1651 /* This function returns true if it is save to enable the nmi window */
1652 static inline bool nested_svm_nmi(struct vcpu_svm *svm)
1653 {
1654 if (!is_nested(svm))
1655 return true;
1656
1657 if (!(svm->nested.intercept & (1ULL << INTERCEPT_NMI)))
1658 return true;
1659
1660 svm->vmcb->control.exit_code = SVM_EXIT_NMI;
1661 svm->nested.exit_required = true;
1662
1663 return false;
1664 }
1665
1666 static void *nested_svm_map(struct vcpu_svm *svm, u64 gpa, struct page **_page)
1667 {
1668 struct page *page;
1669
1670 might_sleep();
1671
1672 page = gfn_to_page(svm->vcpu.kvm, gpa >> PAGE_SHIFT);
1673 if (is_error_page(page))
1674 goto error;
1675
1676 *_page = page;
1677
1678 return kmap(page);
1679
1680 error:
1681 kvm_release_page_clean(page);
1682 kvm_inject_gp(&svm->vcpu, 0);
1683
1684 return NULL;
1685 }
1686
1687 static void nested_svm_unmap(struct page *page)
1688 {
1689 kunmap(page);
1690 kvm_release_page_dirty(page);
1691 }
1692
1693 static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
1694 {
1695 unsigned port;
1696 u8 val, bit;
1697 u64 gpa;
1698
1699 if (!(svm->nested.intercept & (1ULL << INTERCEPT_IOIO_PROT)))
1700 return NESTED_EXIT_HOST;
1701
1702 port = svm->vmcb->control.exit_info_1 >> 16;
1703 gpa = svm->nested.vmcb_iopm + (port / 8);
1704 bit = port % 8;
1705 val = 0;
1706
1707 if (kvm_read_guest(svm->vcpu.kvm, gpa, &val, 1))
1708 val &= (1 << bit);
1709
1710 return val ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
1711 }
1712
1713 static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
1714 {
1715 u32 offset, msr, value;
1716 int write, mask;
1717
1718 if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
1719 return NESTED_EXIT_HOST;
1720
1721 msr = svm->vcpu.arch.regs[VCPU_REGS_RCX];
1722 offset = svm_msrpm_offset(msr);
1723 write = svm->vmcb->control.exit_info_1 & 1;
1724 mask = 1 << ((2 * (msr & 0xf)) + write);
1725
1726 if (offset == MSR_INVALID)
1727 return NESTED_EXIT_DONE;
1728
1729 /* Offset is in 32 bit units but need in 8 bit units */
1730 offset *= 4;
1731
1732 if (kvm_read_guest(svm->vcpu.kvm, svm->nested.vmcb_msrpm + offset, &value, 4))
1733 return NESTED_EXIT_DONE;
1734
1735 return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
1736 }
1737
1738 static int nested_svm_exit_special(struct vcpu_svm *svm)
1739 {
1740 u32 exit_code = svm->vmcb->control.exit_code;
1741
1742 switch (exit_code) {
1743 case SVM_EXIT_INTR:
1744 case SVM_EXIT_NMI:
1745 case SVM_EXIT_EXCP_BASE + MC_VECTOR:
1746 return NESTED_EXIT_HOST;
1747 case SVM_EXIT_NPF:
1748 /* For now we are always handling NPFs when using them */
1749 if (npt_enabled)
1750 return NESTED_EXIT_HOST;
1751 break;
1752 case SVM_EXIT_EXCP_BASE + PF_VECTOR:
1753 /* When we're shadowing, trap PFs */
1754 if (!npt_enabled)
1755 return NESTED_EXIT_HOST;
1756 break;
1757 case SVM_EXIT_EXCP_BASE + NM_VECTOR:
1758 nm_interception(svm);
1759 break;
1760 default:
1761 break;
1762 }
1763
1764 return NESTED_EXIT_CONTINUE;
1765 }
1766
1767 /*
1768 * If this function returns true, this #vmexit was already handled
1769 */
1770 static int nested_svm_intercept(struct vcpu_svm *svm)
1771 {
1772 u32 exit_code = svm->vmcb->control.exit_code;
1773 int vmexit = NESTED_EXIT_HOST;
1774
1775 switch (exit_code) {
1776 case SVM_EXIT_MSR:
1777 vmexit = nested_svm_exit_handled_msr(svm);
1778 break;
1779 case SVM_EXIT_IOIO:
1780 vmexit = nested_svm_intercept_ioio(svm);
1781 break;
1782 case SVM_EXIT_READ_CR0 ... SVM_EXIT_READ_CR8: {
1783 u32 cr_bits = 1 << (exit_code - SVM_EXIT_READ_CR0);
1784 if (svm->nested.intercept_cr_read & cr_bits)
1785 vmexit = NESTED_EXIT_DONE;
1786 break;
1787 }
1788 case SVM_EXIT_WRITE_CR0 ... SVM_EXIT_WRITE_CR8: {
1789 u32 cr_bits = 1 << (exit_code - SVM_EXIT_WRITE_CR0);
1790 if (svm->nested.intercept_cr_write & cr_bits)
1791 vmexit = NESTED_EXIT_DONE;
1792 break;
1793 }
1794 case SVM_EXIT_READ_DR0 ... SVM_EXIT_READ_DR7: {
1795 u32 dr_bits = 1 << (exit_code - SVM_EXIT_READ_DR0);
1796 if (svm->nested.intercept_dr_read & dr_bits)
1797 vmexit = NESTED_EXIT_DONE;
1798 break;
1799 }
1800 case SVM_EXIT_WRITE_DR0 ... SVM_EXIT_WRITE_DR7: {
1801 u32 dr_bits = 1 << (exit_code - SVM_EXIT_WRITE_DR0);
1802 if (svm->nested.intercept_dr_write & dr_bits)
1803 vmexit = NESTED_EXIT_DONE;
1804 break;
1805 }
1806 case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
1807 u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
1808 if (svm->nested.intercept_exceptions & excp_bits)
1809 vmexit = NESTED_EXIT_DONE;
1810 break;
1811 }
1812 case SVM_EXIT_ERR: {
1813 vmexit = NESTED_EXIT_DONE;
1814 break;
1815 }
1816 default: {
1817 u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR);
1818 if (svm->nested.intercept & exit_bits)
1819 vmexit = NESTED_EXIT_DONE;
1820 }
1821 }
1822
1823 return vmexit;
1824 }
1825
1826 static int nested_svm_exit_handled(struct vcpu_svm *svm)
1827 {
1828 int vmexit;
1829
1830 vmexit = nested_svm_intercept(svm);
1831
1832 if (vmexit == NESTED_EXIT_DONE)
1833 nested_svm_vmexit(svm);
1834
1835 return vmexit;
1836 }
1837
1838 static inline void copy_vmcb_control_area(struct vmcb *dst_vmcb, struct vmcb *from_vmcb)
1839 {
1840 struct vmcb_control_area *dst = &dst_vmcb->control;
1841 struct vmcb_control_area *from = &from_vmcb->control;
1842
1843 dst->intercept_cr_read = from->intercept_cr_read;
1844 dst->intercept_cr_write = from->intercept_cr_write;
1845 dst->intercept_dr_read = from->intercept_dr_read;
1846 dst->intercept_dr_write = from->intercept_dr_write;
1847 dst->intercept_exceptions = from->intercept_exceptions;
1848 dst->intercept = from->intercept;
1849 dst->iopm_base_pa = from->iopm_base_pa;
1850 dst->msrpm_base_pa = from->msrpm_base_pa;
1851 dst->tsc_offset = from->tsc_offset;
1852 dst->asid = from->asid;
1853 dst->tlb_ctl = from->tlb_ctl;
1854 dst->int_ctl = from->int_ctl;
1855 dst->int_vector = from->int_vector;
1856 dst->int_state = from->int_state;
1857 dst->exit_code = from->exit_code;
1858 dst->exit_code_hi = from->exit_code_hi;
1859 dst->exit_info_1 = from->exit_info_1;
1860 dst->exit_info_2 = from->exit_info_2;
1861 dst->exit_int_info = from->exit_int_info;
1862 dst->exit_int_info_err = from->exit_int_info_err;
1863 dst->nested_ctl = from->nested_ctl;
1864 dst->event_inj = from->event_inj;
1865 dst->event_inj_err = from->event_inj_err;
1866 dst->nested_cr3 = from->nested_cr3;
1867 dst->lbr_ctl = from->lbr_ctl;
1868 }
1869
1870 static int nested_svm_vmexit(struct vcpu_svm *svm)
1871 {
1872 struct vmcb *nested_vmcb;
1873 struct vmcb *hsave = svm->nested.hsave;
1874 struct vmcb *vmcb = svm->vmcb;
1875 struct page *page;
1876
1877 trace_kvm_nested_vmexit_inject(vmcb->control.exit_code,
1878 vmcb->control.exit_info_1,
1879 vmcb->control.exit_info_2,
1880 vmcb->control.exit_int_info,
1881 vmcb->control.exit_int_info_err);
1882
1883 nested_vmcb = nested_svm_map(svm, svm->nested.vmcb, &page);
1884 if (!nested_vmcb)
1885 return 1;
1886
1887 /* Exit nested SVM mode */
1888 svm->nested.vmcb = 0;
1889
1890 /* Give the current vmcb to the guest */
1891 disable_gif(svm);
1892
1893 nested_vmcb->save.es = vmcb->save.es;
1894 nested_vmcb->save.cs = vmcb->save.cs;
1895 nested_vmcb->save.ss = vmcb->save.ss;
1896 nested_vmcb->save.ds = vmcb->save.ds;
1897 nested_vmcb->save.gdtr = vmcb->save.gdtr;
1898 nested_vmcb->save.idtr = vmcb->save.idtr;
1899 nested_vmcb->save.cr0 = kvm_read_cr0(&svm->vcpu);
1900 nested_vmcb->save.cr3 = svm->vcpu.arch.cr3;
1901 nested_vmcb->save.cr2 = vmcb->save.cr2;
1902 nested_vmcb->save.cr4 = svm->vcpu.arch.cr4;
1903 nested_vmcb->save.rflags = vmcb->save.rflags;
1904 nested_vmcb->save.rip = vmcb->save.rip;
1905 nested_vmcb->save.rsp = vmcb->save.rsp;
1906 nested_vmcb->save.rax = vmcb->save.rax;
1907 nested_vmcb->save.dr7 = vmcb->save.dr7;
1908 nested_vmcb->save.dr6 = vmcb->save.dr6;
1909 nested_vmcb->save.cpl = vmcb->save.cpl;
1910
1911 nested_vmcb->control.int_ctl = vmcb->control.int_ctl;
1912 nested_vmcb->control.int_vector = vmcb->control.int_vector;
1913 nested_vmcb->control.int_state = vmcb->control.int_state;
1914 nested_vmcb->control.exit_code = vmcb->control.exit_code;
1915 nested_vmcb->control.exit_code_hi = vmcb->control.exit_code_hi;
1916 nested_vmcb->control.exit_info_1 = vmcb->control.exit_info_1;
1917 nested_vmcb->control.exit_info_2 = vmcb->control.exit_info_2;
1918 nested_vmcb->control.exit_int_info = vmcb->control.exit_int_info;
1919 nested_vmcb->control.exit_int_info_err = vmcb->control.exit_int_info_err;
1920
1921 /*
1922 * If we emulate a VMRUN/#VMEXIT in the same host #vmexit cycle we have
1923 * to make sure that we do not lose injected events. So check event_inj
1924 * here and copy it to exit_int_info if it is valid.
1925 * Exit_int_info and event_inj can't be both valid because the case
1926 * below only happens on a VMRUN instruction intercept which has
1927 * no valid exit_int_info set.
1928 */
1929 if (vmcb->control.event_inj & SVM_EVTINJ_VALID) {
1930 struct vmcb_control_area *nc = &nested_vmcb->control;
1931
1932 nc->exit_int_info = vmcb->control.event_inj;
1933 nc->exit_int_info_err = vmcb->control.event_inj_err;
1934 }
1935
1936 nested_vmcb->control.tlb_ctl = 0;
1937 nested_vmcb->control.event_inj = 0;
1938 nested_vmcb->control.event_inj_err = 0;
1939
1940 /* We always set V_INTR_MASKING and remember the old value in hflags */
1941 if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
1942 nested_vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
1943
1944 /* Restore the original control entries */
1945 copy_vmcb_control_area(vmcb, hsave);
1946
1947 kvm_clear_exception_queue(&svm->vcpu);
1948 kvm_clear_interrupt_queue(&svm->vcpu);
1949
1950 /* Restore selected save entries */
1951 svm->vmcb->save.es = hsave->save.es;
1952 svm->vmcb->save.cs = hsave->save.cs;
1953 svm->vmcb->save.ss = hsave->save.ss;
1954 svm->vmcb->save.ds = hsave->save.ds;
1955 svm->vmcb->save.gdtr = hsave->save.gdtr;
1956 svm->vmcb->save.idtr = hsave->save.idtr;
1957 svm->vmcb->save.rflags = hsave->save.rflags;
1958 svm_set_efer(&svm->vcpu, hsave->save.efer);
1959 svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE);
1960 svm_set_cr4(&svm->vcpu, hsave->save.cr4);
1961 if (npt_enabled) {
1962 svm->vmcb->save.cr3 = hsave->save.cr3;
1963 svm->vcpu.arch.cr3 = hsave->save.cr3;
1964 } else {
1965 (void)kvm_set_cr3(&svm->vcpu, hsave->save.cr3);
1966 }
1967 kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, hsave->save.rax);
1968 kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, hsave->save.rsp);
1969 kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, hsave->save.rip);
1970 svm->vmcb->save.dr7 = 0;
1971 svm->vmcb->save.cpl = 0;
1972 svm->vmcb->control.exit_int_info = 0;
1973
1974 nested_svm_unmap(page);
1975
1976 kvm_mmu_reset_context(&svm->vcpu);
1977 kvm_mmu_load(&svm->vcpu);
1978
1979 return 0;
1980 }
1981
1982 static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
1983 {
1984 /*
1985 * This function merges the msr permission bitmaps of kvm and the
1986 * nested vmcb. It is omptimized in that it only merges the parts where
1987 * the kvm msr permission bitmap may contain zero bits
1988 */
1989 int i;
1990
1991 if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
1992 return true;
1993
1994 for (i = 0; i < MSRPM_OFFSETS; i++) {
1995 u32 value, p;
1996 u64 offset;
1997
1998 if (msrpm_offsets[i] == 0xffffffff)
1999 break;
2000
2001 p = msrpm_offsets[i];
2002 offset = svm->nested.vmcb_msrpm + (p * 4);
2003
2004 if (kvm_read_guest(svm->vcpu.kvm, offset, &value, 4))
2005 return false;
2006
2007 svm->nested.msrpm[p] = svm->msrpm[p] | value;
2008 }
2009
2010 svm->vmcb->control.msrpm_base_pa = __pa(svm->nested.msrpm);
2011
2012 return true;
2013 }
2014
2015 static bool nested_svm_vmrun(struct vcpu_svm *svm)
2016 {
2017 struct vmcb *nested_vmcb;
2018 struct vmcb *hsave = svm->nested.hsave;
2019 struct vmcb *vmcb = svm->vmcb;
2020 struct page *page;
2021 u64 vmcb_gpa;
2022
2023 vmcb_gpa = svm->vmcb->save.rax;
2024
2025 nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
2026 if (!nested_vmcb)
2027 return false;
2028
2029 trace_kvm_nested_vmrun(svm->vmcb->save.rip - 3, vmcb_gpa,
2030 nested_vmcb->save.rip,
2031 nested_vmcb->control.int_ctl,
2032 nested_vmcb->control.event_inj,
2033 nested_vmcb->control.nested_ctl);
2034
2035 trace_kvm_nested_intercepts(nested_vmcb->control.intercept_cr_read,
2036 nested_vmcb->control.intercept_cr_write,
2037 nested_vmcb->control.intercept_exceptions,
2038 nested_vmcb->control.intercept);
2039
2040 /* Clear internal status */
2041 kvm_clear_exception_queue(&svm->vcpu);
2042 kvm_clear_interrupt_queue(&svm->vcpu);
2043
2044 /*
2045 * Save the old vmcb, so we don't need to pick what we save, but can
2046 * restore everything when a VMEXIT occurs
2047 */
2048 hsave->save.es = vmcb->save.es;
2049 hsave->save.cs = vmcb->save.cs;
2050 hsave->save.ss = vmcb->save.ss;
2051 hsave->save.ds = vmcb->save.ds;
2052 hsave->save.gdtr = vmcb->save.gdtr;
2053 hsave->save.idtr = vmcb->save.idtr;
2054 hsave->save.efer = svm->vcpu.arch.efer;
2055 hsave->save.cr0 = kvm_read_cr0(&svm->vcpu);
2056 hsave->save.cr4 = svm->vcpu.arch.cr4;
2057 hsave->save.rflags = vmcb->save.rflags;
2058 hsave->save.rip = svm->next_rip;
2059 hsave->save.rsp = vmcb->save.rsp;
2060 hsave->save.rax = vmcb->save.rax;
2061 if (npt_enabled)
2062 hsave->save.cr3 = vmcb->save.cr3;
2063 else
2064 hsave->save.cr3 = svm->vcpu.arch.cr3;
2065
2066 copy_vmcb_control_area(hsave, vmcb);
2067
2068 if (svm->vmcb->save.rflags & X86_EFLAGS_IF)
2069 svm->vcpu.arch.hflags |= HF_HIF_MASK;
2070 else
2071 svm->vcpu.arch.hflags &= ~HF_HIF_MASK;
2072
2073 /* Load the nested guest state */
2074 svm->vmcb->save.es = nested_vmcb->save.es;
2075 svm->vmcb->save.cs = nested_vmcb->save.cs;
2076 svm->vmcb->save.ss = nested_vmcb->save.ss;
2077 svm->vmcb->save.ds = nested_vmcb->save.ds;
2078 svm->vmcb->save.gdtr = nested_vmcb->save.gdtr;
2079 svm->vmcb->save.idtr = nested_vmcb->save.idtr;
2080 svm->vmcb->save.rflags = nested_vmcb->save.rflags;
2081 svm_set_efer(&svm->vcpu, nested_vmcb->save.efer);
2082 svm_set_cr0(&svm->vcpu, nested_vmcb->save.cr0);
2083 svm_set_cr4(&svm->vcpu, nested_vmcb->save.cr4);
2084 if (npt_enabled) {
2085 svm->vmcb->save.cr3 = nested_vmcb->save.cr3;
2086 svm->vcpu.arch.cr3 = nested_vmcb->save.cr3;
2087 } else
2088 (void)kvm_set_cr3(&svm->vcpu, nested_vmcb->save.cr3);
2089
2090 /* Guest paging mode is active - reset mmu */
2091 kvm_mmu_reset_context(&svm->vcpu);
2092
2093 svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = nested_vmcb->save.cr2;
2094 kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, nested_vmcb->save.rax);
2095 kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, nested_vmcb->save.rsp);
2096 kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, nested_vmcb->save.rip);
2097
2098 /* In case we don't even reach vcpu_run, the fields are not updated */
2099 svm->vmcb->save.rax = nested_vmcb->save.rax;
2100 svm->vmcb->save.rsp = nested_vmcb->save.rsp;
2101 svm->vmcb->save.rip = nested_vmcb->save.rip;
2102 svm->vmcb->save.dr7 = nested_vmcb->save.dr7;
2103 svm->vmcb->save.dr6 = nested_vmcb->save.dr6;
2104 svm->vmcb->save.cpl = nested_vmcb->save.cpl;
2105
2106 svm->nested.vmcb_msrpm = nested_vmcb->control.msrpm_base_pa & ~0x0fffULL;
2107 svm->nested.vmcb_iopm = nested_vmcb->control.iopm_base_pa & ~0x0fffULL;
2108
2109 /* cache intercepts */
2110 svm->nested.intercept_cr_read = nested_vmcb->control.intercept_cr_read;
2111 svm->nested.intercept_cr_write = nested_vmcb->control.intercept_cr_write;
2112 svm->nested.intercept_dr_read = nested_vmcb->control.intercept_dr_read;
2113 svm->nested.intercept_dr_write = nested_vmcb->control.intercept_dr_write;
2114 svm->nested.intercept_exceptions = nested_vmcb->control.intercept_exceptions;
2115 svm->nested.intercept = nested_vmcb->control.intercept;
2116
2117 force_new_asid(&svm->vcpu);
2118 svm->vmcb->control.int_ctl = nested_vmcb->control.int_ctl | V_INTR_MASKING_MASK;
2119 if (nested_vmcb->control.int_ctl & V_INTR_MASKING_MASK)
2120 svm->vcpu.arch.hflags |= HF_VINTR_MASK;
2121 else
2122 svm->vcpu.arch.hflags &= ~HF_VINTR_MASK;
2123
2124 if (svm->vcpu.arch.hflags & HF_VINTR_MASK) {
2125 /* We only want the cr8 intercept bits of the guest */
2126 svm->vmcb->control.intercept_cr_read &= ~INTERCEPT_CR8_MASK;
2127 svm->vmcb->control.intercept_cr_write &= ~INTERCEPT_CR8_MASK;
2128 }
2129
2130 /* We don't want to see VMMCALLs from a nested guest */
2131 svm->vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMMCALL);
2132
2133 /*
2134 * We don't want a nested guest to be more powerful than the guest, so
2135 * all intercepts are ORed
2136 */
2137 svm->vmcb->control.intercept_cr_read |=
2138 nested_vmcb->control.intercept_cr_read;
2139 svm->vmcb->control.intercept_cr_write |=
2140 nested_vmcb->control.intercept_cr_write;
2141 svm->vmcb->control.intercept_dr_read |=
2142 nested_vmcb->control.intercept_dr_read;
2143 svm->vmcb->control.intercept_dr_write |=
2144 nested_vmcb->control.intercept_dr_write;
2145 svm->vmcb->control.intercept_exceptions |=
2146 nested_vmcb->control.intercept_exceptions;
2147
2148 svm->vmcb->control.intercept |= nested_vmcb->control.intercept;
2149
2150 svm->vmcb->control.lbr_ctl = nested_vmcb->control.lbr_ctl;
2151 svm->vmcb->control.int_vector = nested_vmcb->control.int_vector;
2152 svm->vmcb->control.int_state = nested_vmcb->control.int_state;
2153 svm->vmcb->control.tsc_offset += nested_vmcb->control.tsc_offset;
2154 svm->vmcb->control.event_inj = nested_vmcb->control.event_inj;
2155 svm->vmcb->control.event_inj_err = nested_vmcb->control.event_inj_err;
2156
2157 nested_svm_unmap(page);
2158
2159 /* nested_vmcb is our indicator if nested SVM is activated */
2160 svm->nested.vmcb = vmcb_gpa;
2161
2162 enable_gif(svm);
2163
2164 return true;
2165 }
2166
2167 static void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
2168 {
2169 to_vmcb->save.fs = from_vmcb->save.fs;
2170 to_vmcb->save.gs = from_vmcb->save.gs;
2171 to_vmcb->save.tr = from_vmcb->save.tr;
2172 to_vmcb->save.ldtr = from_vmcb->save.ldtr;
2173 to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base;
2174 to_vmcb->save.star = from_vmcb->save.star;
2175 to_vmcb->save.lstar = from_vmcb->save.lstar;
2176 to_vmcb->save.cstar = from_vmcb->save.cstar;
2177 to_vmcb->save.sfmask = from_vmcb->save.sfmask;
2178 to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs;
2179 to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp;
2180 to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip;
2181 }
2182
2183 static int vmload_interception(struct vcpu_svm *svm)
2184 {
2185 struct vmcb *nested_vmcb;
2186 struct page *page;
2187
2188 if (nested_svm_check_permissions(svm))
2189 return 1;
2190
2191 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2192 skip_emulated_instruction(&svm->vcpu);
2193
2194 nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
2195 if (!nested_vmcb)
2196 return 1;
2197
2198 nested_svm_vmloadsave(nested_vmcb, svm->vmcb);
2199 nested_svm_unmap(page);
2200
2201 return 1;
2202 }
2203
2204 static int vmsave_interception(struct vcpu_svm *svm)
2205 {
2206 struct vmcb *nested_vmcb;
2207 struct page *page;
2208
2209 if (nested_svm_check_permissions(svm))
2210 return 1;
2211
2212 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2213 skip_emulated_instruction(&svm->vcpu);
2214
2215 nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
2216 if (!nested_vmcb)
2217 return 1;
2218
2219 nested_svm_vmloadsave(svm->vmcb, nested_vmcb);
2220 nested_svm_unmap(page);
2221
2222 return 1;
2223 }
2224
2225 static int vmrun_interception(struct vcpu_svm *svm)
2226 {
2227 if (nested_svm_check_permissions(svm))
2228 return 1;
2229
2230 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2231 skip_emulated_instruction(&svm->vcpu);
2232
2233 if (!nested_svm_vmrun(svm))
2234 return 1;
2235
2236 if (!nested_svm_vmrun_msrpm(svm))
2237 goto failed;
2238
2239 return 1;
2240
2241 failed:
2242
2243 svm->vmcb->control.exit_code = SVM_EXIT_ERR;
2244 svm->vmcb->control.exit_code_hi = 0;
2245 svm->vmcb->control.exit_info_1 = 0;
2246 svm->vmcb->control.exit_info_2 = 0;
2247
2248 nested_svm_vmexit(svm);
2249
2250 return 1;
2251 }
2252
2253 static int stgi_interception(struct vcpu_svm *svm)
2254 {
2255 if (nested_svm_check_permissions(svm))
2256 return 1;
2257
2258 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2259 skip_emulated_instruction(&svm->vcpu);
2260
2261 enable_gif(svm);
2262
2263 return 1;
2264 }
2265
2266 static int clgi_interception(struct vcpu_svm *svm)
2267 {
2268 if (nested_svm_check_permissions(svm))
2269 return 1;
2270
2271 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2272 skip_emulated_instruction(&svm->vcpu);
2273
2274 disable_gif(svm);
2275
2276 /* After a CLGI no interrupts should come */
2277 svm_clear_vintr(svm);
2278 svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
2279
2280 return 1;
2281 }
2282
2283 static int invlpga_interception(struct vcpu_svm *svm)
2284 {
2285 struct kvm_vcpu *vcpu = &svm->vcpu;
2286
2287 trace_kvm_invlpga(svm->vmcb->save.rip, vcpu->arch.regs[VCPU_REGS_RCX],
2288 vcpu->arch.regs[VCPU_REGS_RAX]);
2289
2290 /* Let's treat INVLPGA the same as INVLPG (can be optimized!) */
2291 kvm_mmu_invlpg(vcpu, vcpu->arch.regs[VCPU_REGS_RAX]);
2292
2293 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2294 skip_emulated_instruction(&svm->vcpu);
2295 return 1;
2296 }
2297
2298 static int skinit_interception(struct vcpu_svm *svm)
2299 {
2300 trace_kvm_skinit(svm->vmcb->save.rip, svm->vcpu.arch.regs[VCPU_REGS_RAX]);
2301
2302 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
2303 return 1;
2304 }
2305
2306 static int invalid_op_interception(struct vcpu_svm *svm)
2307 {
2308 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
2309 return 1;
2310 }
2311
2312 static int task_switch_interception(struct vcpu_svm *svm)
2313 {
2314 u16 tss_selector;
2315 int reason;
2316 int int_type = svm->vmcb->control.exit_int_info &
2317 SVM_EXITINTINFO_TYPE_MASK;
2318 int int_vec = svm->vmcb->control.exit_int_info & SVM_EVTINJ_VEC_MASK;
2319 uint32_t type =
2320 svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_TYPE_MASK;
2321 uint32_t idt_v =
2322 svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_VALID;
2323 bool has_error_code = false;
2324 u32 error_code = 0;
2325
2326 tss_selector = (u16)svm->vmcb->control.exit_info_1;
2327
2328 if (svm->vmcb->control.exit_info_2 &
2329 (1ULL << SVM_EXITINFOSHIFT_TS_REASON_IRET))
2330 reason = TASK_SWITCH_IRET;
2331 else if (svm->vmcb->control.exit_info_2 &
2332 (1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP))
2333 reason = TASK_SWITCH_JMP;
2334 else if (idt_v)
2335 reason = TASK_SWITCH_GATE;
2336 else
2337 reason = TASK_SWITCH_CALL;
2338
2339 if (reason == TASK_SWITCH_GATE) {
2340 switch (type) {
2341 case SVM_EXITINTINFO_TYPE_NMI:
2342 svm->vcpu.arch.nmi_injected = false;
2343 break;
2344 case SVM_EXITINTINFO_TYPE_EXEPT:
2345 if (svm->vmcb->control.exit_info_2 &
2346 (1ULL << SVM_EXITINFOSHIFT_TS_HAS_ERROR_CODE)) {
2347 has_error_code = true;
2348 error_code =
2349 (u32)svm->vmcb->control.exit_info_2;
2350 }
2351 kvm_clear_exception_queue(&svm->vcpu);
2352 break;
2353 case SVM_EXITINTINFO_TYPE_INTR:
2354 kvm_clear_interrupt_queue(&svm->vcpu);
2355 break;
2356 default:
2357 break;
2358 }
2359 }
2360
2361 if (reason != TASK_SWITCH_GATE ||
2362 int_type == SVM_EXITINTINFO_TYPE_SOFT ||
2363 (int_type == SVM_EXITINTINFO_TYPE_EXEPT &&
2364 (int_vec == OF_VECTOR || int_vec == BP_VECTOR)))
2365 skip_emulated_instruction(&svm->vcpu);
2366
2367 if (kvm_task_switch(&svm->vcpu, tss_selector, reason,
2368 has_error_code, error_code) == EMULATE_FAIL) {
2369 svm->vcpu.run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
2370 svm->vcpu.run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
2371 svm->vcpu.run->internal.ndata = 0;
2372 return 0;
2373 }
2374 return 1;
2375 }
2376
2377 static int cpuid_interception(struct vcpu_svm *svm)
2378 {
2379 svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
2380 kvm_emulate_cpuid(&svm->vcpu);
2381 return 1;
2382 }
2383
2384 static int iret_interception(struct vcpu_svm *svm)
2385 {
2386 ++svm->vcpu.stat.nmi_window_exits;
2387 svm->vmcb->control.intercept &= ~(1ULL << INTERCEPT_IRET);
2388 svm->vcpu.arch.hflags |= HF_IRET_MASK;
2389 return 1;
2390 }
2391
2392 static int invlpg_interception(struct vcpu_svm *svm)
2393 {
2394 return emulate_instruction(&svm->vcpu, 0, 0, 0) == EMULATE_DONE;
2395 }
2396
2397 static int emulate_on_interception(struct vcpu_svm *svm)
2398 {
2399 return emulate_instruction(&svm->vcpu, 0, 0, 0) == EMULATE_DONE;
2400 }
2401
2402 static int cr8_write_interception(struct vcpu_svm *svm)
2403 {
2404 struct kvm_run *kvm_run = svm->vcpu.run;
2405
2406 u8 cr8_prev = kvm_get_cr8(&svm->vcpu);
2407 /* instruction emulation calls kvm_set_cr8() */
2408 emulate_instruction(&svm->vcpu, 0, 0, 0);
2409 if (irqchip_in_kernel(svm->vcpu.kvm)) {
2410 svm->vmcb->control.intercept_cr_write &= ~INTERCEPT_CR8_MASK;
2411 return 1;
2412 }
2413 if (cr8_prev <= kvm_get_cr8(&svm->vcpu))
2414 return 1;
2415 kvm_run->exit_reason = KVM_EXIT_SET_TPR;
2416 return 0;
2417 }
2418
2419 static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data)
2420 {
2421 struct vcpu_svm *svm = to_svm(vcpu);
2422
2423 switch (ecx) {
2424 case MSR_IA32_TSC: {
2425 u64 tsc_offset;
2426
2427 if (is_nested(svm))
2428 tsc_offset = svm->nested.hsave->control.tsc_offset;
2429 else
2430 tsc_offset = svm->vmcb->control.tsc_offset;
2431
2432 *data = tsc_offset + native_read_tsc();
2433 break;
2434 }
2435 case MSR_STAR:
2436 *data = svm->vmcb->save.star;
2437 break;
2438 #ifdef CONFIG_X86_64
2439 case MSR_LSTAR:
2440 *data = svm->vmcb->save.lstar;
2441 break;
2442 case MSR_CSTAR:
2443 *data = svm->vmcb->save.cstar;
2444 break;
2445 case MSR_KERNEL_GS_BASE:
2446 *data = svm->vmcb->save.kernel_gs_base;
2447 break;
2448 case MSR_SYSCALL_MASK:
2449 *data = svm->vmcb->save.sfmask;
2450 break;
2451 #endif
2452 case MSR_IA32_SYSENTER_CS:
2453 *data = svm->vmcb->save.sysenter_cs;
2454 break;
2455 case MSR_IA32_SYSENTER_EIP:
2456 *data = svm->sysenter_eip;
2457 break;
2458 case MSR_IA32_SYSENTER_ESP:
2459 *data = svm->sysenter_esp;
2460 break;
2461 /*
2462 * Nobody will change the following 5 values in the VMCB so we can
2463 * safely return them on rdmsr. They will always be 0 until LBRV is
2464 * implemented.
2465 */
2466 case MSR_IA32_DEBUGCTLMSR:
2467 *data = svm->vmcb->save.dbgctl;
2468 break;
2469 case MSR_IA32_LASTBRANCHFROMIP:
2470 *data = svm->vmcb->save.br_from;
2471 break;
2472 case MSR_IA32_LASTBRANCHTOIP:
2473 *data = svm->vmcb->save.br_to;
2474 break;
2475 case MSR_IA32_LASTINTFROMIP:
2476 *data = svm->vmcb->save.last_excp_from;
2477 break;
2478 case MSR_IA32_LASTINTTOIP:
2479 *data = svm->vmcb->save.last_excp_to;
2480 break;
2481 case MSR_VM_HSAVE_PA:
2482 *data = svm->nested.hsave_msr;
2483 break;
2484 case MSR_VM_CR:
2485 *data = svm->nested.vm_cr_msr;
2486 break;
2487 case MSR_IA32_UCODE_REV:
2488 *data = 0x01000065;
2489 break;
2490 default:
2491 return kvm_get_msr_common(vcpu, ecx, data);
2492 }
2493 return 0;
2494 }
2495
2496 static int rdmsr_interception(struct vcpu_svm *svm)
2497 {
2498 u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX];
2499 u64 data;
2500
2501 if (svm_get_msr(&svm->vcpu, ecx, &data)) {
2502 trace_kvm_msr_read_ex(ecx);
2503 kvm_inject_gp(&svm->vcpu, 0);
2504 } else {
2505 trace_kvm_msr_read(ecx, data);
2506
2507 svm->vcpu.arch.regs[VCPU_REGS_RAX] = data & 0xffffffff;
2508 svm->vcpu.arch.regs[VCPU_REGS_RDX] = data >> 32;
2509 svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
2510 skip_emulated_instruction(&svm->vcpu);
2511 }
2512 return 1;
2513 }
2514
2515 static int svm_set_vm_cr(struct kvm_vcpu *vcpu, u64 data)
2516 {
2517 struct vcpu_svm *svm = to_svm(vcpu);
2518 int svm_dis, chg_mask;
2519
2520 if (data & ~SVM_VM_CR_VALID_MASK)
2521 return 1;
2522
2523 chg_mask = SVM_VM_CR_VALID_MASK;
2524
2525 if (svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK)
2526 chg_mask &= ~(SVM_VM_CR_SVM_LOCK_MASK | SVM_VM_CR_SVM_DIS_MASK);
2527
2528 svm->nested.vm_cr_msr &= ~chg_mask;
2529 svm->nested.vm_cr_msr |= (data & chg_mask);
2530
2531 svm_dis = svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK;
2532
2533 /* check for svm_disable while efer.svme is set */
2534 if (svm_dis && (vcpu->arch.efer & EFER_SVME))
2535 return 1;
2536
2537 return 0;
2538 }
2539
2540 static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
2541 {
2542 struct vcpu_svm *svm = to_svm(vcpu);
2543
2544 switch (ecx) {
2545 case MSR_IA32_TSC: {
2546 u64 tsc_offset = data - native_read_tsc();
2547 u64 g_tsc_offset = 0;
2548
2549 if (is_nested(svm)) {
2550 g_tsc_offset = svm->vmcb->control.tsc_offset -
2551 svm->nested.hsave->control.tsc_offset;
2552 svm->nested.hsave->control.tsc_offset = tsc_offset;
2553 }
2554
2555 svm->vmcb->control.tsc_offset = tsc_offset + g_tsc_offset;
2556
2557 break;
2558 }
2559 case MSR_STAR:
2560 svm->vmcb->save.star = data;
2561 break;
2562 #ifdef CONFIG_X86_64
2563 case MSR_LSTAR:
2564 svm->vmcb->save.lstar = data;
2565 break;
2566 case MSR_CSTAR:
2567 svm->vmcb->save.cstar = data;
2568 break;
2569 case MSR_KERNEL_GS_BASE:
2570 svm->vmcb->save.kernel_gs_base = data;
2571 break;
2572 case MSR_SYSCALL_MASK:
2573 svm->vmcb->save.sfmask = data;
2574 break;
2575 #endif
2576 case MSR_IA32_SYSENTER_CS:
2577 svm->vmcb->save.sysenter_cs = data;
2578 break;
2579 case MSR_IA32_SYSENTER_EIP:
2580 svm->sysenter_eip = data;
2581 svm->vmcb->save.sysenter_eip = data;
2582 break;
2583 case MSR_IA32_SYSENTER_ESP:
2584 svm->sysenter_esp = data;
2585 svm->vmcb->save.sysenter_esp = data;
2586 break;
2587 case MSR_IA32_DEBUGCTLMSR:
2588 if (!svm_has(SVM_FEATURE_LBRV)) {
2589 pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTL 0x%llx, nop\n",
2590 __func__, data);
2591 break;
2592 }
2593 if (data & DEBUGCTL_RESERVED_BITS)
2594 return 1;
2595
2596 svm->vmcb->save.dbgctl = data;
2597 if (data & (1ULL<<0))
2598 svm_enable_lbrv(svm);
2599 else
2600 svm_disable_lbrv(svm);
2601 break;
2602 case MSR_VM_HSAVE_PA:
2603 svm->nested.hsave_msr = data;
2604 break;
2605 case MSR_VM_CR:
2606 return svm_set_vm_cr(vcpu, data);
2607 case MSR_VM_IGNNE:
2608 pr_unimpl(vcpu, "unimplemented wrmsr: 0x%x data 0x%llx\n", ecx, data);
2609 break;
2610 default:
2611 return kvm_set_msr_common(vcpu, ecx, data);
2612 }
2613 return 0;
2614 }
2615
2616 static int wrmsr_interception(struct vcpu_svm *svm)
2617 {
2618 u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX];
2619 u64 data = (svm->vcpu.arch.regs[VCPU_REGS_RAX] & -1u)
2620 | ((u64)(svm->vcpu.arch.regs[VCPU_REGS_RDX] & -1u) << 32);
2621
2622
2623 svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
2624 if (svm_set_msr(&svm->vcpu, ecx, data)) {
2625 trace_kvm_msr_write_ex(ecx, data);
2626 kvm_inject_gp(&svm->vcpu, 0);
2627 } else {
2628 trace_kvm_msr_write(ecx, data);
2629 skip_emulated_instruction(&svm->vcpu);
2630 }
2631 return 1;
2632 }
2633
2634 static int msr_interception(struct vcpu_svm *svm)
2635 {
2636 if (svm->vmcb->control.exit_info_1)
2637 return wrmsr_interception(svm);
2638 else
2639 return rdmsr_interception(svm);
2640 }
2641
2642 static int interrupt_window_interception(struct vcpu_svm *svm)
2643 {
2644 struct kvm_run *kvm_run = svm->vcpu.run;
2645
2646 svm_clear_vintr(svm);
2647 svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
2648 /*
2649 * If the user space waits to inject interrupts, exit as soon as
2650 * possible
2651 */
2652 if (!irqchip_in_kernel(svm->vcpu.kvm) &&
2653 kvm_run->request_interrupt_window &&
2654 !kvm_cpu_has_interrupt(&svm->vcpu)) {
2655 ++svm->vcpu.stat.irq_window_exits;
2656 kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
2657 return 0;
2658 }
2659
2660 return 1;
2661 }
2662
2663 static int pause_interception(struct vcpu_svm *svm)
2664 {
2665 kvm_vcpu_on_spin(&(svm->vcpu));
2666 return 1;
2667 }
2668
2669 static int (*svm_exit_handlers[])(struct vcpu_svm *svm) = {
2670 [SVM_EXIT_READ_CR0] = emulate_on_interception,
2671 [SVM_EXIT_READ_CR3] = emulate_on_interception,
2672 [SVM_EXIT_READ_CR4] = emulate_on_interception,
2673 [SVM_EXIT_READ_CR8] = emulate_on_interception,
2674 [SVM_EXIT_CR0_SEL_WRITE] = emulate_on_interception,
2675 [SVM_EXIT_WRITE_CR0] = emulate_on_interception,
2676 [SVM_EXIT_WRITE_CR3] = emulate_on_interception,
2677 [SVM_EXIT_WRITE_CR4] = emulate_on_interception,
2678 [SVM_EXIT_WRITE_CR8] = cr8_write_interception,
2679 [SVM_EXIT_READ_DR0] = emulate_on_interception,
2680 [SVM_EXIT_READ_DR1] = emulate_on_interception,
2681 [SVM_EXIT_READ_DR2] = emulate_on_interception,
2682 [SVM_EXIT_READ_DR3] = emulate_on_interception,
2683 [SVM_EXIT_READ_DR4] = emulate_on_interception,
2684 [SVM_EXIT_READ_DR5] = emulate_on_interception,
2685 [SVM_EXIT_READ_DR6] = emulate_on_interception,
2686 [SVM_EXIT_READ_DR7] = emulate_on_interception,
2687 [SVM_EXIT_WRITE_DR0] = emulate_on_interception,
2688 [SVM_EXIT_WRITE_DR1] = emulate_on_interception,
2689 [SVM_EXIT_WRITE_DR2] = emulate_on_interception,
2690 [SVM_EXIT_WRITE_DR3] = emulate_on_interception,
2691 [SVM_EXIT_WRITE_DR4] = emulate_on_interception,
2692 [SVM_EXIT_WRITE_DR5] = emulate_on_interception,
2693 [SVM_EXIT_WRITE_DR6] = emulate_on_interception,
2694 [SVM_EXIT_WRITE_DR7] = emulate_on_interception,
2695 [SVM_EXIT_EXCP_BASE + DB_VECTOR] = db_interception,
2696 [SVM_EXIT_EXCP_BASE + BP_VECTOR] = bp_interception,
2697 [SVM_EXIT_EXCP_BASE + UD_VECTOR] = ud_interception,
2698 [SVM_EXIT_EXCP_BASE + PF_VECTOR] = pf_interception,
2699 [SVM_EXIT_EXCP_BASE + NM_VECTOR] = nm_interception,
2700 [SVM_EXIT_EXCP_BASE + MC_VECTOR] = mc_interception,
2701 [SVM_EXIT_INTR] = intr_interception,
2702 [SVM_EXIT_NMI] = nmi_interception,
2703 [SVM_EXIT_SMI] = nop_on_interception,
2704 [SVM_EXIT_INIT] = nop_on_interception,
2705 [SVM_EXIT_VINTR] = interrupt_window_interception,
2706 [SVM_EXIT_CPUID] = cpuid_interception,
2707 [SVM_EXIT_IRET] = iret_interception,
2708 [SVM_EXIT_INVD] = emulate_on_interception,
2709 [SVM_EXIT_PAUSE] = pause_interception,
2710 [SVM_EXIT_HLT] = halt_interception,
2711 [SVM_EXIT_INVLPG] = invlpg_interception,
2712 [SVM_EXIT_INVLPGA] = invlpga_interception,
2713 [SVM_EXIT_IOIO] = io_interception,
2714 [SVM_EXIT_MSR] = msr_interception,
2715 [SVM_EXIT_TASK_SWITCH] = task_switch_interception,
2716 [SVM_EXIT_SHUTDOWN] = shutdown_interception,
2717 [SVM_EXIT_VMRUN] = vmrun_interception,
2718 [SVM_EXIT_VMMCALL] = vmmcall_interception,
2719 [SVM_EXIT_VMLOAD] = vmload_interception,
2720 [SVM_EXIT_VMSAVE] = vmsave_interception,
2721 [SVM_EXIT_STGI] = stgi_interception,
2722 [SVM_EXIT_CLGI] = clgi_interception,
2723 [SVM_EXIT_SKINIT] = skinit_interception,
2724 [SVM_EXIT_WBINVD] = emulate_on_interception,
2725 [SVM_EXIT_MONITOR] = invalid_op_interception,
2726 [SVM_EXIT_MWAIT] = invalid_op_interception,
2727 [SVM_EXIT_NPF] = pf_interception,
2728 };
2729
2730 void dump_vmcb(struct kvm_vcpu *vcpu)
2731 {
2732 struct vcpu_svm *svm = to_svm(vcpu);
2733 struct vmcb_control_area *control = &svm->vmcb->control;
2734 struct vmcb_save_area *save = &svm->vmcb->save;
2735
2736 pr_err("VMCB Control Area:\n");
2737 pr_err("cr_read: %04x\n", control->intercept_cr_read);
2738 pr_err("cr_write: %04x\n", control->intercept_cr_write);
2739 pr_err("dr_read: %04x\n", control->intercept_dr_read);
2740 pr_err("dr_write: %04x\n", control->intercept_dr_write);
2741 pr_err("exceptions: %08x\n", control->intercept_exceptions);
2742 pr_err("intercepts: %016llx\n", control->intercept);
2743 pr_err("pause filter count: %d\n", control->pause_filter_count);
2744 pr_err("iopm_base_pa: %016llx\n", control->iopm_base_pa);
2745 pr_err("msrpm_base_pa: %016llx\n", control->msrpm_base_pa);
2746 pr_err("tsc_offset: %016llx\n", control->tsc_offset);
2747 pr_err("asid: %d\n", control->asid);
2748 pr_err("tlb_ctl: %d\n", control->tlb_ctl);
2749 pr_err("int_ctl: %08x\n", control->int_ctl);
2750 pr_err("int_vector: %08x\n", control->int_vector);
2751 pr_err("int_state: %08x\n", control->int_state);
2752 pr_err("exit_code: %08x\n", control->exit_code);
2753 pr_err("exit_info1: %016llx\n", control->exit_info_1);
2754 pr_err("exit_info2: %016llx\n", control->exit_info_2);
2755 pr_err("exit_int_info: %08x\n", control->exit_int_info);
2756 pr_err("exit_int_info_err: %08x\n", control->exit_int_info_err);
2757 pr_err("nested_ctl: %lld\n", control->nested_ctl);
2758 pr_err("nested_cr3: %016llx\n", control->nested_cr3);
2759 pr_err("event_inj: %08x\n", control->event_inj);
2760 pr_err("event_inj_err: %08x\n", control->event_inj_err);
2761 pr_err("lbr_ctl: %lld\n", control->lbr_ctl);
2762 pr_err("next_rip: %016llx\n", control->next_rip);
2763 pr_err("VMCB State Save Area:\n");
2764 pr_err("es: s: %04x a: %04x l: %08x b: %016llx\n",
2765 save->es.selector, save->es.attrib,
2766 save->es.limit, save->es.base);
2767 pr_err("cs: s: %04x a: %04x l: %08x b: %016llx\n",
2768 save->cs.selector, save->cs.attrib,
2769 save->cs.limit, save->cs.base);
2770 pr_err("ss: s: %04x a: %04x l: %08x b: %016llx\n",
2771 save->ss.selector, save->ss.attrib,
2772 save->ss.limit, save->ss.base);
2773 pr_err("ds: s: %04x a: %04x l: %08x b: %016llx\n",
2774 save->ds.selector, save->ds.attrib,
2775 save->ds.limit, save->ds.base);
2776 pr_err("fs: s: %04x a: %04x l: %08x b: %016llx\n",
2777 save->fs.selector, save->fs.attrib,
2778 save->fs.limit, save->fs.base);
2779 pr_err("gs: s: %04x a: %04x l: %08x b: %016llx\n",
2780 save->gs.selector, save->gs.attrib,
2781 save->gs.limit, save->gs.base);
2782 pr_err("gdtr: s: %04x a: %04x l: %08x b: %016llx\n",
2783 save->gdtr.selector, save->gdtr.attrib,
2784 save->gdtr.limit, save->gdtr.base);
2785 pr_err("ldtr: s: %04x a: %04x l: %08x b: %016llx\n",
2786 save->ldtr.selector, save->ldtr.attrib,
2787 save->ldtr.limit, save->ldtr.base);
2788 pr_err("idtr: s: %04x a: %04x l: %08x b: %016llx\n",
2789 save->idtr.selector, save->idtr.attrib,
2790 save->idtr.limit, save->idtr.base);
2791 pr_err("tr: s: %04x a: %04x l: %08x b: %016llx\n",
2792 save->tr.selector, save->tr.attrib,
2793 save->tr.limit, save->tr.base);
2794 pr_err("cpl: %d efer: %016llx\n",
2795 save->cpl, save->efer);
2796 pr_err("cr0: %016llx cr2: %016llx\n",
2797 save->cr0, save->cr2);
2798 pr_err("cr3: %016llx cr4: %016llx\n",
2799 save->cr3, save->cr4);
2800 pr_err("dr6: %016llx dr7: %016llx\n",
2801 save->dr6, save->dr7);
2802 pr_err("rip: %016llx rflags: %016llx\n",
2803 save->rip, save->rflags);
2804 pr_err("rsp: %016llx rax: %016llx\n",
2805 save->rsp, save->rax);
2806 pr_err("star: %016llx lstar: %016llx\n",
2807 save->star, save->lstar);
2808 pr_err("cstar: %016llx sfmask: %016llx\n",
2809 save->cstar, save->sfmask);
2810 pr_err("kernel_gs_base: %016llx sysenter_cs: %016llx\n",
2811 save->kernel_gs_base, save->sysenter_cs);
2812 pr_err("sysenter_esp: %016llx sysenter_eip: %016llx\n",
2813 save->sysenter_esp, save->sysenter_eip);
2814 pr_err("gpat: %016llx dbgctl: %016llx\n",
2815 save->g_pat, save->dbgctl);
2816 pr_err("br_from: %016llx br_to: %016llx\n",
2817 save->br_from, save->br_to);
2818 pr_err("excp_from: %016llx excp_to: %016llx\n",
2819 save->last_excp_from, save->last_excp_to);
2820
2821 }
2822
2823 static int handle_exit(struct kvm_vcpu *vcpu)
2824 {
2825 struct vcpu_svm *svm = to_svm(vcpu);
2826 struct kvm_run *kvm_run = vcpu->run;
2827 u32 exit_code = svm->vmcb->control.exit_code;
2828
2829 trace_kvm_exit(exit_code, vcpu);
2830
2831 if (!(svm->vmcb->control.intercept_cr_write & INTERCEPT_CR0_MASK))
2832 vcpu->arch.cr0 = svm->vmcb->save.cr0;
2833 if (npt_enabled)
2834 vcpu->arch.cr3 = svm->vmcb->save.cr3;
2835
2836 if (unlikely(svm->nested.exit_required)) {
2837 nested_svm_vmexit(svm);
2838 svm->nested.exit_required = false;
2839
2840 return 1;
2841 }
2842
2843 if (is_nested(svm)) {
2844 int vmexit;
2845
2846 trace_kvm_nested_vmexit(svm->vmcb->save.rip, exit_code,
2847 svm->vmcb->control.exit_info_1,
2848 svm->vmcb->control.exit_info_2,
2849 svm->vmcb->control.exit_int_info,
2850 svm->vmcb->control.exit_int_info_err);
2851
2852 vmexit = nested_svm_exit_special(svm);
2853
2854 if (vmexit == NESTED_EXIT_CONTINUE)
2855 vmexit = nested_svm_exit_handled(svm);
2856
2857 if (vmexit == NESTED_EXIT_DONE)
2858 return 1;
2859 }
2860
2861 svm_complete_interrupts(svm);
2862
2863 if (svm->vmcb->control.exit_code == SVM_EXIT_ERR) {
2864 kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
2865 kvm_run->fail_entry.hardware_entry_failure_reason
2866 = svm->vmcb->control.exit_code;
2867 pr_err("KVM: FAILED VMRUN WITH VMCB:\n");
2868 dump_vmcb(vcpu);
2869 return 0;
2870 }
2871
2872 if (is_external_interrupt(svm->vmcb->control.exit_int_info) &&
2873 exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR &&
2874 exit_code != SVM_EXIT_NPF && exit_code != SVM_EXIT_TASK_SWITCH)
2875 printk(KERN_ERR "%s: unexpected exit_ini_info 0x%x "
2876 "exit_code 0x%x\n",
2877 __func__, svm->vmcb->control.exit_int_info,
2878 exit_code);
2879
2880 if (exit_code >= ARRAY_SIZE(svm_exit_handlers)
2881 || !svm_exit_handlers[exit_code]) {
2882 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
2883 kvm_run->hw.hardware_exit_reason = exit_code;
2884 return 0;
2885 }
2886
2887 return svm_exit_handlers[exit_code](svm);
2888 }
2889
2890 static void reload_tss(struct kvm_vcpu *vcpu)
2891 {
2892 int cpu = raw_smp_processor_id();
2893
2894 struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
2895 sd->tss_desc->type = 9; /* available 32/64-bit TSS */
2896 load_TR_desc();
2897 }
2898
2899 static void pre_svm_run(struct vcpu_svm *svm)
2900 {
2901 int cpu = raw_smp_processor_id();
2902
2903 struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
2904
2905 svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;
2906 /* FIXME: handle wraparound of asid_generation */
2907 if (svm->asid_generation != sd->asid_generation)
2908 new_asid(svm, sd);
2909 }
2910
2911 static void svm_inject_nmi(struct kvm_vcpu *vcpu)
2912 {
2913 struct vcpu_svm *svm = to_svm(vcpu);
2914
2915 svm->vmcb->control.event_inj = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI;
2916 vcpu->arch.hflags |= HF_NMI_MASK;
2917 svm->vmcb->control.intercept |= (1ULL << INTERCEPT_IRET);
2918 ++vcpu->stat.nmi_injections;
2919 }
2920
2921 static inline void svm_inject_irq(struct vcpu_svm *svm, int irq)
2922 {
2923 struct vmcb_control_area *control;
2924
2925 control = &svm->vmcb->control;
2926 control->int_vector = irq;
2927 control->int_ctl &= ~V_INTR_PRIO_MASK;
2928 control->int_ctl |= V_IRQ_MASK |
2929 ((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT);
2930 }
2931
2932 static void svm_set_irq(struct kvm_vcpu *vcpu)
2933 {
2934 struct vcpu_svm *svm = to_svm(vcpu);
2935
2936 BUG_ON(!(gif_set(svm)));
2937
2938 trace_kvm_inj_virq(vcpu->arch.interrupt.nr);
2939 ++vcpu->stat.irq_injections;
2940
2941 svm->vmcb->control.event_inj = vcpu->arch.interrupt.nr |
2942 SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR;
2943 }
2944
2945 static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
2946 {
2947 struct vcpu_svm *svm = to_svm(vcpu);
2948
2949 if (is_nested(svm) && (vcpu->arch.hflags & HF_VINTR_MASK))
2950 return;
2951
2952 if (irr == -1)
2953 return;
2954
2955 if (tpr >= irr)
2956 svm->vmcb->control.intercept_cr_write |= INTERCEPT_CR8_MASK;
2957 }
2958
2959 static int svm_nmi_allowed(struct kvm_vcpu *vcpu)
2960 {
2961 struct vcpu_svm *svm = to_svm(vcpu);
2962 struct vmcb *vmcb = svm->vmcb;
2963 int ret;
2964 ret = !(vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) &&
2965 !(svm->vcpu.arch.hflags & HF_NMI_MASK);
2966 ret = ret && gif_set(svm) && nested_svm_nmi(svm);
2967
2968 return ret;
2969 }
2970
2971 static bool svm_get_nmi_mask(struct kvm_vcpu *vcpu)
2972 {
2973 struct vcpu_svm *svm = to_svm(vcpu);
2974
2975 return !!(svm->vcpu.arch.hflags & HF_NMI_MASK);
2976 }
2977
2978 static void svm_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
2979 {
2980 struct vcpu_svm *svm = to_svm(vcpu);
2981
2982 if (masked) {
2983 svm->vcpu.arch.hflags |= HF_NMI_MASK;
2984 svm->vmcb->control.intercept |= (1ULL << INTERCEPT_IRET);
2985 } else {
2986 svm->vcpu.arch.hflags &= ~HF_NMI_MASK;
2987 svm->vmcb->control.intercept &= ~(1ULL << INTERCEPT_IRET);
2988 }
2989 }
2990
2991 static int svm_interrupt_allowed(struct kvm_vcpu *vcpu)
2992 {
2993 struct vcpu_svm *svm = to_svm(vcpu);
2994 struct vmcb *vmcb = svm->vmcb;
2995 int ret;
2996
2997 if (!gif_set(svm) ||
2998 (vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK))
2999 return 0;
3000
3001 ret = !!(vmcb->save.rflags & X86_EFLAGS_IF);
3002
3003 if (is_nested(svm))
3004 return ret && !(svm->vcpu.arch.hflags & HF_VINTR_MASK);
3005
3006 return ret;
3007 }
3008
3009 static void enable_irq_window(struct kvm_vcpu *vcpu)
3010 {
3011 struct vcpu_svm *svm = to_svm(vcpu);
3012
3013 /*
3014 * In case GIF=0 we can't rely on the CPU to tell us when GIF becomes
3015 * 1, because that's a separate STGI/VMRUN intercept. The next time we
3016 * get that intercept, this function will be called again though and
3017 * we'll get the vintr intercept.
3018 */
3019 if (gif_set(svm) && nested_svm_intr(svm)) {
3020 svm_set_vintr(svm);
3021 svm_inject_irq(svm, 0x0);
3022 }
3023 }
3024
3025 static void enable_nmi_window(struct kvm_vcpu *vcpu)
3026 {
3027 struct vcpu_svm *svm = to_svm(vcpu);
3028
3029 if ((svm->vcpu.arch.hflags & (HF_NMI_MASK | HF_IRET_MASK))
3030 == HF_NMI_MASK)
3031 return; /* IRET will cause a vm exit */
3032
3033 /*
3034 * Something prevents NMI from been injected. Single step over possible
3035 * problem (IRET or exception injection or interrupt shadow)
3036 */
3037 svm->nmi_singlestep = true;
3038 svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
3039 update_db_intercept(vcpu);
3040 }
3041
3042 static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)
3043 {
3044 return 0;
3045 }
3046
3047 static void svm_flush_tlb(struct kvm_vcpu *vcpu)
3048 {
3049 force_new_asid(vcpu);
3050 }
3051
3052 static void svm_prepare_guest_switch(struct kvm_vcpu *vcpu)
3053 {
3054 }
3055
3056 static inline void sync_cr8_to_lapic(struct kvm_vcpu *vcpu)
3057 {
3058 struct vcpu_svm *svm = to_svm(vcpu);
3059
3060 if (is_nested(svm) && (vcpu->arch.hflags & HF_VINTR_MASK))
3061 return;
3062
3063 if (!(svm->vmcb->control.intercept_cr_write & INTERCEPT_CR8_MASK)) {
3064 int cr8 = svm->vmcb->control.int_ctl & V_TPR_MASK;
3065 kvm_set_cr8(vcpu, cr8);
3066 }
3067 }
3068
3069 static inline void sync_lapic_to_cr8(struct kvm_vcpu *vcpu)
3070 {
3071 struct vcpu_svm *svm = to_svm(vcpu);
3072 u64 cr8;
3073
3074 if (is_nested(svm) && (vcpu->arch.hflags & HF_VINTR_MASK))
3075 return;
3076
3077 cr8 = kvm_get_cr8(vcpu);
3078 svm->vmcb->control.int_ctl &= ~V_TPR_MASK;
3079 svm->vmcb->control.int_ctl |= cr8 & V_TPR_MASK;
3080 }
3081
3082 static void svm_complete_interrupts(struct vcpu_svm *svm)
3083 {
3084 u8 vector;
3085 int type;
3086 u32 exitintinfo = svm->vmcb->control.exit_int_info;
3087 unsigned int3_injected = svm->int3_injected;
3088
3089 svm->int3_injected = 0;
3090
3091 if (svm->vcpu.arch.hflags & HF_IRET_MASK)
3092 svm->vcpu.arch.hflags &= ~(HF_NMI_MASK | HF_IRET_MASK);
3093
3094 svm->vcpu.arch.nmi_injected = false;
3095 kvm_clear_exception_queue(&svm->vcpu);
3096 kvm_clear_interrupt_queue(&svm->vcpu);
3097
3098 if (!(exitintinfo & SVM_EXITINTINFO_VALID))
3099 return;
3100
3101 vector = exitintinfo & SVM_EXITINTINFO_VEC_MASK;
3102 type = exitintinfo & SVM_EXITINTINFO_TYPE_MASK;
3103
3104 switch (type) {
3105 case SVM_EXITINTINFO_TYPE_NMI:
3106 svm->vcpu.arch.nmi_injected = true;
3107 break;
3108 case SVM_EXITINTINFO_TYPE_EXEPT:
3109 /*
3110 * In case of software exceptions, do not reinject the vector,
3111 * but re-execute the instruction instead. Rewind RIP first
3112 * if we emulated INT3 before.
3113 */
3114 if (kvm_exception_is_soft(vector)) {
3115 if (vector == BP_VECTOR && int3_injected &&
3116 kvm_is_linear_rip(&svm->vcpu, svm->int3_rip))
3117 kvm_rip_write(&svm->vcpu,
3118 kvm_rip_read(&svm->vcpu) -
3119 int3_injected);
3120 break;
3121 }
3122 if (exitintinfo & SVM_EXITINTINFO_VALID_ERR) {
3123 u32 err = svm->vmcb->control.exit_int_info_err;
3124 kvm_requeue_exception_e(&svm->vcpu, vector, err);
3125
3126 } else
3127 kvm_requeue_exception(&svm->vcpu, vector);
3128 break;
3129 case SVM_EXITINTINFO_TYPE_INTR:
3130 kvm_queue_interrupt(&svm->vcpu, vector, false);
3131 break;
3132 default:
3133 break;
3134 }
3135 }
3136
3137 #ifdef CONFIG_X86_64
3138 #define R "r"
3139 #else
3140 #define R "e"
3141 #endif
3142
3143 static void svm_vcpu_run(struct kvm_vcpu *vcpu)
3144 {
3145 struct vcpu_svm *svm = to_svm(vcpu);
3146 u16 fs_selector;
3147 u16 gs_selector;
3148 u16 ldt_selector;
3149
3150 svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
3151 svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
3152 svm->vmcb->save.rip = vcpu->arch.regs[VCPU_REGS_RIP];
3153
3154 /*
3155 * A vmexit emulation is required before the vcpu can be executed
3156 * again.
3157 */
3158 if (unlikely(svm->nested.exit_required))
3159 return;
3160
3161 pre_svm_run(svm);
3162
3163 sync_lapic_to_cr8(vcpu);
3164
3165 save_host_msrs(vcpu);
3166 savesegment(fs, fs_selector);
3167 savesegment(gs, gs_selector);
3168 ldt_selector = kvm_read_ldt();
3169 svm->vmcb->save.cr2 = vcpu->arch.cr2;
3170 /* required for live migration with NPT */
3171 if (npt_enabled)
3172 svm->vmcb->save.cr3 = vcpu->arch.cr3;
3173
3174 clgi();
3175
3176 local_irq_enable();
3177
3178 asm volatile (
3179 "push %%"R"bp; \n\t"
3180 "mov %c[rbx](%[svm]), %%"R"bx \n\t"
3181 "mov %c[rcx](%[svm]), %%"R"cx \n\t"
3182 "mov %c[rdx](%[svm]), %%"R"dx \n\t"
3183 "mov %c[rsi](%[svm]), %%"R"si \n\t"
3184 "mov %c[rdi](%[svm]), %%"R"di \n\t"
3185 "mov %c[rbp](%[svm]), %%"R"bp \n\t"
3186 #ifdef CONFIG_X86_64
3187 "mov %c[r8](%[svm]), %%r8 \n\t"
3188 "mov %c[r9](%[svm]), %%r9 \n\t"
3189 "mov %c[r10](%[svm]), %%r10 \n\t"
3190 "mov %c[r11](%[svm]), %%r11 \n\t"
3191 "mov %c[r12](%[svm]), %%r12 \n\t"
3192 "mov %c[r13](%[svm]), %%r13 \n\t"
3193 "mov %c[r14](%[svm]), %%r14 \n\t"
3194 "mov %c[r15](%[svm]), %%r15 \n\t"
3195 #endif
3196
3197 /* Enter guest mode */
3198 "push %%"R"ax \n\t"
3199 "mov %c[vmcb](%[svm]), %%"R"ax \n\t"
3200 __ex(SVM_VMLOAD) "\n\t"
3201 __ex(SVM_VMRUN) "\n\t"
3202 __ex(SVM_VMSAVE) "\n\t"
3203 "pop %%"R"ax \n\t"
3204
3205 /* Save guest registers, load host registers */
3206 "mov %%"R"bx, %c[rbx](%[svm]) \n\t"
3207 "mov %%"R"cx, %c[rcx](%[svm]) \n\t"
3208 "mov %%"R"dx, %c[rdx](%[svm]) \n\t"
3209 "mov %%"R"si, %c[rsi](%[svm]) \n\t"
3210 "mov %%"R"di, %c[rdi](%[svm]) \n\t"
3211 "mov %%"R"bp, %c[rbp](%[svm]) \n\t"
3212 #ifdef CONFIG_X86_64
3213 "mov %%r8, %c[r8](%[svm]) \n\t"
3214 "mov %%r9, %c[r9](%[svm]) \n\t"
3215 "mov %%r10, %c[r10](%[svm]) \n\t"
3216 "mov %%r11, %c[r11](%[svm]) \n\t"
3217 "mov %%r12, %c[r12](%[svm]) \n\t"
3218 "mov %%r13, %c[r13](%[svm]) \n\t"
3219 "mov %%r14, %c[r14](%[svm]) \n\t"
3220 "mov %%r15, %c[r15](%[svm]) \n\t"
3221 #endif
3222 "pop %%"R"bp"
3223 :
3224 : [svm]"a"(svm),
3225 [vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)),
3226 [rbx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBX])),
3227 [rcx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RCX])),
3228 [rdx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDX])),
3229 [rsi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RSI])),
3230 [rdi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDI])),
3231 [rbp]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBP]))
3232 #ifdef CONFIG_X86_64
3233 , [r8]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R8])),
3234 [r9]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R9])),
3235 [r10]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R10])),
3236 [r11]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R11])),
3237 [r12]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R12])),
3238 [r13]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R13])),
3239 [r14]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R14])),
3240 [r15]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R15]))
3241 #endif
3242 : "cc", "memory"
3243 , R"bx", R"cx", R"dx", R"si", R"di"
3244 #ifdef CONFIG_X86_64
3245 , "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15"
3246 #endif
3247 );
3248
3249 vcpu->arch.cr2 = svm->vmcb->save.cr2;
3250 vcpu->arch.regs[VCPU_REGS_RAX] = svm->vmcb->save.rax;
3251 vcpu->arch.regs[VCPU_REGS_RSP] = svm->vmcb->save.rsp;
3252 vcpu->arch.regs[VCPU_REGS_RIP] = svm->vmcb->save.rip;
3253
3254 load_host_msrs(vcpu);
3255 loadsegment(fs, fs_selector);
3256 #ifdef CONFIG_X86_64
3257 load_gs_index(gs_selector);
3258 wrmsrl(MSR_KERNEL_GS_BASE, current->thread.gs);
3259 #else
3260 loadsegment(gs, gs_selector);
3261 #endif
3262 kvm_load_ldt(ldt_selector);
3263
3264 reload_tss(vcpu);
3265
3266 local_irq_disable();
3267
3268 stgi();
3269
3270 sync_cr8_to_lapic(vcpu);
3271
3272 svm->next_rip = 0;
3273
3274 if (npt_enabled) {
3275 vcpu->arch.regs_avail &= ~(1 << VCPU_EXREG_PDPTR);
3276 vcpu->arch.regs_dirty &= ~(1 << VCPU_EXREG_PDPTR);
3277 }
3278
3279 /*
3280 * We need to handle MC intercepts here before the vcpu has a chance to
3281 * change the physical cpu
3282 */
3283 if (unlikely(svm->vmcb->control.exit_code ==
3284 SVM_EXIT_EXCP_BASE + MC_VECTOR))
3285 svm_handle_mce(svm);
3286 }
3287
3288 #undef R
3289
3290 static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
3291 {
3292 struct vcpu_svm *svm = to_svm(vcpu);
3293
3294 if (npt_enabled) {
3295 svm->vmcb->control.nested_cr3 = root;
3296 force_new_asid(vcpu);
3297 return;
3298 }
3299
3300 svm->vmcb->save.cr3 = root;
3301 force_new_asid(vcpu);
3302 }
3303
3304 static int is_disabled(void)
3305 {
3306 u64 vm_cr;
3307
3308 rdmsrl(MSR_VM_CR, vm_cr);
3309 if (vm_cr & (1 << SVM_VM_CR_SVM_DISABLE))
3310 return 1;
3311
3312 return 0;
3313 }
3314
3315 static void
3316 svm_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
3317 {
3318 /*
3319 * Patch in the VMMCALL instruction:
3320 */
3321 hypercall[0] = 0x0f;
3322 hypercall[1] = 0x01;
3323 hypercall[2] = 0xd9;
3324 }
3325
3326 static void svm_check_processor_compat(void *rtn)
3327 {
3328 *(int *)rtn = 0;
3329 }
3330
3331 static bool svm_cpu_has_accelerated_tpr(void)
3332 {
3333 return false;
3334 }
3335
3336 static int get_npt_level(void)
3337 {
3338 #ifdef CONFIG_X86_64
3339 return PT64_ROOT_LEVEL;
3340 #else
3341 return PT32E_ROOT_LEVEL;
3342 #endif
3343 }
3344
3345 static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
3346 {
3347 return 0;
3348 }
3349
3350 static void svm_cpuid_update(struct kvm_vcpu *vcpu)
3351 {
3352 }
3353
3354 static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
3355 {
3356 switch (func) {
3357 case 0x8000000A:
3358 entry->eax = 1; /* SVM revision 1 */
3359 entry->ebx = 8; /* Lets support 8 ASIDs in case we add proper
3360 ASID emulation to nested SVM */
3361 entry->ecx = 0; /* Reserved */
3362 entry->edx = 0; /* Do not support any additional features */
3363
3364 break;
3365 }
3366 }
3367
3368 static const struct trace_print_flags svm_exit_reasons_str[] = {
3369 { SVM_EXIT_READ_CR0, "read_cr0" },
3370 { SVM_EXIT_READ_CR3, "read_cr3" },
3371 { SVM_EXIT_READ_CR4, "read_cr4" },
3372 { SVM_EXIT_READ_CR8, "read_cr8" },
3373 { SVM_EXIT_WRITE_CR0, "write_cr0" },
3374 { SVM_EXIT_WRITE_CR3, "write_cr3" },
3375 { SVM_EXIT_WRITE_CR4, "write_cr4" },
3376 { SVM_EXIT_WRITE_CR8, "write_cr8" },
3377 { SVM_EXIT_READ_DR0, "read_dr0" },
3378 { SVM_EXIT_READ_DR1, "read_dr1" },
3379 { SVM_EXIT_READ_DR2, "read_dr2" },
3380 { SVM_EXIT_READ_DR3, "read_dr3" },
3381 { SVM_EXIT_WRITE_DR0, "write_dr0" },
3382 { SVM_EXIT_WRITE_DR1, "write_dr1" },
3383 { SVM_EXIT_WRITE_DR2, "write_dr2" },
3384 { SVM_EXIT_WRITE_DR3, "write_dr3" },
3385 { SVM_EXIT_WRITE_DR5, "write_dr5" },
3386 { SVM_EXIT_WRITE_DR7, "write_dr7" },
3387 { SVM_EXIT_EXCP_BASE + DB_VECTOR, "DB excp" },
3388 { SVM_EXIT_EXCP_BASE + BP_VECTOR, "BP excp" },
3389 { SVM_EXIT_EXCP_BASE + UD_VECTOR, "UD excp" },
3390 { SVM_EXIT_EXCP_BASE + PF_VECTOR, "PF excp" },
3391 { SVM_EXIT_EXCP_BASE + NM_VECTOR, "NM excp" },
3392 { SVM_EXIT_EXCP_BASE + MC_VECTOR, "MC excp" },
3393 { SVM_EXIT_INTR, "interrupt" },
3394 { SVM_EXIT_NMI, "nmi" },
3395 { SVM_EXIT_SMI, "smi" },
3396 { SVM_EXIT_INIT, "init" },
3397 { SVM_EXIT_VINTR, "vintr" },
3398 { SVM_EXIT_CPUID, "cpuid" },
3399 { SVM_EXIT_INVD, "invd" },
3400 { SVM_EXIT_HLT, "hlt" },
3401 { SVM_EXIT_INVLPG, "invlpg" },
3402 { SVM_EXIT_INVLPGA, "invlpga" },
3403 { SVM_EXIT_IOIO, "io" },
3404 { SVM_EXIT_MSR, "msr" },
3405 { SVM_EXIT_TASK_SWITCH, "task_switch" },
3406 { SVM_EXIT_SHUTDOWN, "shutdown" },
3407 { SVM_EXIT_VMRUN, "vmrun" },
3408 { SVM_EXIT_VMMCALL, "hypercall" },
3409 { SVM_EXIT_VMLOAD, "vmload" },
3410 { SVM_EXIT_VMSAVE, "vmsave" },
3411 { SVM_EXIT_STGI, "stgi" },
3412 { SVM_EXIT_CLGI, "clgi" },
3413 { SVM_EXIT_SKINIT, "skinit" },
3414 { SVM_EXIT_WBINVD, "wbinvd" },
3415 { SVM_EXIT_MONITOR, "monitor" },
3416 { SVM_EXIT_MWAIT, "mwait" },
3417 { SVM_EXIT_NPF, "npf" },
3418 { -1, NULL }
3419 };
3420
3421 static int svm_get_lpage_level(void)
3422 {
3423 return PT_PDPE_LEVEL;
3424 }
3425
3426 static bool svm_rdtscp_supported(void)
3427 {
3428 return false;
3429 }
3430
3431 static bool svm_has_wbinvd_exit(void)
3432 {
3433 return true;
3434 }
3435
3436 static void svm_fpu_deactivate(struct kvm_vcpu *vcpu)
3437 {
3438 struct vcpu_svm *svm = to_svm(vcpu);
3439
3440 svm->vmcb->control.intercept_exceptions |= 1 << NM_VECTOR;
3441 if (is_nested(svm))
3442 svm->nested.hsave->control.intercept_exceptions |= 1 << NM_VECTOR;
3443 update_cr0_intercept(svm);
3444 }
3445
3446 static struct kvm_x86_ops svm_x86_ops = {
3447 .cpu_has_kvm_support = has_svm,
3448 .disabled_by_bios = is_disabled,
3449 .hardware_setup = svm_hardware_setup,
3450 .hardware_unsetup = svm_hardware_unsetup,
3451 .check_processor_compatibility = svm_check_processor_compat,
3452 .hardware_enable = svm_hardware_enable,
3453 .hardware_disable = svm_hardware_disable,
3454 .cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr,
3455
3456 .vcpu_create = svm_create_vcpu,
3457 .vcpu_free = svm_free_vcpu,
3458 .vcpu_reset = svm_vcpu_reset,
3459
3460 .prepare_guest_switch = svm_prepare_guest_switch,
3461 .vcpu_load = svm_vcpu_load,
3462 .vcpu_put = svm_vcpu_put,
3463
3464 .set_guest_debug = svm_guest_debug,
3465 .get_msr = svm_get_msr,
3466 .set_msr = svm_set_msr,
3467 .get_segment_base = svm_get_segment_base,
3468 .get_segment = svm_get_segment,
3469 .set_segment = svm_set_segment,
3470 .get_cpl = svm_get_cpl,
3471 .get_cs_db_l_bits = kvm_get_cs_db_l_bits,
3472 .decache_cr0_guest_bits = svm_decache_cr0_guest_bits,
3473 .decache_cr4_guest_bits = svm_decache_cr4_guest_bits,
3474 .set_cr0 = svm_set_cr0,
3475 .set_cr3 = svm_set_cr3,
3476 .set_cr4 = svm_set_cr4,
3477 .set_efer = svm_set_efer,
3478 .get_idt = svm_get_idt,
3479 .set_idt = svm_set_idt,
3480 .get_gdt = svm_get_gdt,
3481 .set_gdt = svm_set_gdt,
3482 .set_dr7 = svm_set_dr7,
3483 .cache_reg = svm_cache_reg,
3484 .get_rflags = svm_get_rflags,
3485 .set_rflags = svm_set_rflags,
3486 .fpu_activate = svm_fpu_activate,
3487 .fpu_deactivate = svm_fpu_deactivate,
3488
3489 .tlb_flush = svm_flush_tlb,
3490
3491 .run = svm_vcpu_run,
3492 .handle_exit = handle_exit,
3493 .skip_emulated_instruction = skip_emulated_instruction,
3494 .set_interrupt_shadow = svm_set_interrupt_shadow,
3495 .get_interrupt_shadow = svm_get_interrupt_shadow,
3496 .patch_hypercall = svm_patch_hypercall,
3497 .set_irq = svm_set_irq,
3498 .set_nmi = svm_inject_nmi,
3499 .queue_exception = svm_queue_exception,
3500 .interrupt_allowed = svm_interrupt_allowed,
3501 .nmi_allowed = svm_nmi_allowed,
3502 .get_nmi_mask = svm_get_nmi_mask,
3503 .set_nmi_mask = svm_set_nmi_mask,
3504 .enable_nmi_window = enable_nmi_window,
3505 .enable_irq_window = enable_irq_window,
3506 .update_cr8_intercept = update_cr8_intercept,
3507
3508 .set_tss_addr = svm_set_tss_addr,
3509 .get_tdp_level = get_npt_level,
3510 .get_mt_mask = svm_get_mt_mask,
3511
3512 .exit_reasons_str = svm_exit_reasons_str,
3513 .get_lpage_level = svm_get_lpage_level,
3514
3515 .cpuid_update = svm_cpuid_update,
3516
3517 .rdtscp_supported = svm_rdtscp_supported,
3518
3519 .set_supported_cpuid = svm_set_supported_cpuid,
3520
3521 .has_wbinvd_exit = svm_has_wbinvd_exit,
3522 };
3523
3524 static int __init svm_init(void)
3525 {
3526 return kvm_init(&svm_x86_ops, sizeof(struct vcpu_svm),
3527 __alignof__(struct vcpu_svm), THIS_MODULE);
3528 }
3529
3530 static void __exit svm_exit(void)
3531 {
3532 kvm_exit();
3533 }
3534
3535 module_init(svm_init)
3536 module_exit(svm_exit)
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