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-rw-r--r--drivers/kvm/svm.c1677
1 files changed, 1677 insertions, 0 deletions
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
new file mode 100644
index 000000000000..a33a89c68138
--- /dev/null
+++ b/drivers/kvm/svm.c
@@ -0,0 +1,1677 @@
1/*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * AMD SVM support
5 *
6 * Copyright (C) 2006 Qumranet, Inc.
7 *
8 * Authors:
9 * Yaniv Kamay <yaniv@qumranet.com>
10 * Avi Kivity <avi@qumranet.com>
11 *
12 * This work is licensed under the terms of the GNU GPL, version 2. See
13 * the COPYING file in the top-level directory.
14 *
15 */
16
17#include <linux/module.h>
18#include <linux/vmalloc.h>
19#include <linux/highmem.h>
20#include <asm/desc.h>
21
22#include "kvm_svm.h"
23#include "x86_emulate.h"
24
25MODULE_AUTHOR("Qumranet");
26MODULE_LICENSE("GPL");
27
28#define IOPM_ALLOC_ORDER 2
29#define MSRPM_ALLOC_ORDER 1
30
31#define DB_VECTOR 1
32#define UD_VECTOR 6
33#define GP_VECTOR 13
34
35#define DR7_GD_MASK (1 << 13)
36#define DR6_BD_MASK (1 << 13)
37#define CR4_DE_MASK (1UL << 3)
38
39#define SEG_TYPE_LDT 2
40#define SEG_TYPE_BUSY_TSS16 3
41
42#define KVM_EFER_LMA (1 << 10)
43#define KVM_EFER_LME (1 << 8)
44
45unsigned long iopm_base;
46unsigned long msrpm_base;
47
48struct kvm_ldttss_desc {
49 u16 limit0;
50 u16 base0;
51 unsigned base1 : 8, type : 5, dpl : 2, p : 1;
52 unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8;
53 u32 base3;
54 u32 zero1;
55} __attribute__((packed));
56
57struct svm_cpu_data {
58 int cpu;
59
60 uint64_t asid_generation;
61 uint32_t max_asid;
62 uint32_t next_asid;
63 struct kvm_ldttss_desc *tss_desc;
64
65 struct page *save_area;
66};
67
68static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data);
69
70struct svm_init_data {
71 int cpu;
72 int r;
73};
74
75static u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000};
76
77#define NUM_MSR_MAPS (sizeof(msrpm_ranges) / sizeof(*msrpm_ranges))
78#define MSRS_RANGE_SIZE 2048
79#define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2)
80
81#define MAX_INST_SIZE 15
82
83static unsigned get_addr_size(struct kvm_vcpu *vcpu)
84{
85 struct vmcb_save_area *sa = &vcpu->svm->vmcb->save;
86 u16 cs_attrib;
87
88 if (!(sa->cr0 & CR0_PE_MASK) || (sa->rflags & X86_EFLAGS_VM))
89 return 2;
90
91 cs_attrib = sa->cs.attrib;
92
93 return (cs_attrib & SVM_SELECTOR_L_MASK) ? 8 :
94 (cs_attrib & SVM_SELECTOR_DB_MASK) ? 4 : 2;
95}
96
97static inline u8 pop_irq(struct kvm_vcpu *vcpu)
98{
99 int word_index = __ffs(vcpu->irq_summary);
100 int bit_index = __ffs(vcpu->irq_pending[word_index]);
101 int irq = word_index * BITS_PER_LONG + bit_index;
102
103 clear_bit(bit_index, &vcpu->irq_pending[word_index]);
104 if (!vcpu->irq_pending[word_index])
105 clear_bit(word_index, &vcpu->irq_summary);
106 return irq;
107}
108
109static inline void push_irq(struct kvm_vcpu *vcpu, u8 irq)
110{
111 set_bit(irq, vcpu->irq_pending);
112 set_bit(irq / BITS_PER_LONG, &vcpu->irq_summary);
113}
114
115static inline void clgi(void)
116{
117 asm volatile (SVM_CLGI);
118}
119
120static inline void stgi(void)
121{
122 asm volatile (SVM_STGI);
123}
124
125static inline void invlpga(unsigned long addr, u32 asid)
126{
127 asm volatile (SVM_INVLPGA :: "a"(addr), "c"(asid));
128}
129
130static inline unsigned long kvm_read_cr2(void)
131{
132 unsigned long cr2;
133
134 asm volatile ("mov %%cr2, %0" : "=r" (cr2));
135 return cr2;
136}
137
138static inline void kvm_write_cr2(unsigned long val)
139{
140 asm volatile ("mov %0, %%cr2" :: "r" (val));
141}
142
143static inline unsigned long read_dr6(void)
144{
145 unsigned long dr6;
146
147 asm volatile ("mov %%dr6, %0" : "=r" (dr6));
148 return dr6;
149}
150
151static inline void write_dr6(unsigned long val)
152{
153 asm volatile ("mov %0, %%dr6" :: "r" (val));
154}
155
156static inline unsigned long read_dr7(void)
157{
158 unsigned long dr7;
159
160 asm volatile ("mov %%dr7, %0" : "=r" (dr7));
161 return dr7;
162}
163
164static inline void write_dr7(unsigned long val)
165{
166 asm volatile ("mov %0, %%dr7" :: "r" (val));
167}
168
169static inline int svm_is_long_mode(struct kvm_vcpu *vcpu)
170{
171 return vcpu->svm->vmcb->save.efer & KVM_EFER_LMA;
172}
173
174static inline void force_new_asid(struct kvm_vcpu *vcpu)
175{
176 vcpu->svm->asid_generation--;
177}
178
179static inline void flush_guest_tlb(struct kvm_vcpu *vcpu)
180{
181 force_new_asid(vcpu);
182}
183
184static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
185{
186 if (!(efer & KVM_EFER_LMA))
187 efer &= ~KVM_EFER_LME;
188
189 vcpu->svm->vmcb->save.efer = efer | MSR_EFER_SVME_MASK;
190 vcpu->shadow_efer = efer;
191}
192
193static void svm_inject_gp(struct kvm_vcpu *vcpu, unsigned error_code)
194{
195 vcpu->svm->vmcb->control.event_inj = SVM_EVTINJ_VALID |
196 SVM_EVTINJ_VALID_ERR |
197 SVM_EVTINJ_TYPE_EXEPT |
198 GP_VECTOR;
199 vcpu->svm->vmcb->control.event_inj_err = error_code;
200}
201
202static void inject_ud(struct kvm_vcpu *vcpu)
203{
204 vcpu->svm->vmcb->control.event_inj = SVM_EVTINJ_VALID |
205 SVM_EVTINJ_TYPE_EXEPT |
206 UD_VECTOR;
207}
208
209static void inject_db(struct kvm_vcpu *vcpu)
210{
211 vcpu->svm->vmcb->control.event_inj = SVM_EVTINJ_VALID |
212 SVM_EVTINJ_TYPE_EXEPT |
213 DB_VECTOR;
214}
215
216static int is_page_fault(uint32_t info)
217{
218 info &= SVM_EVTINJ_VEC_MASK | SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID;
219 return info == (PF_VECTOR | SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_EXEPT);
220}
221
222static int is_external_interrupt(u32 info)
223{
224 info &= SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID;
225 return info == (SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR);
226}
227
228static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
229{
230 if (!vcpu->svm->next_rip) {
231 printk(KERN_DEBUG "%s: NOP\n", __FUNCTION__);
232 return;
233 }
234 if (vcpu->svm->next_rip - vcpu->svm->vmcb->save.rip > 15) {
235 printk(KERN_ERR "%s: ip 0x%llx next 0x%llx\n",
236 __FUNCTION__,
237 vcpu->svm->vmcb->save.rip,
238 vcpu->svm->next_rip);
239 }
240
241 vcpu->rip = vcpu->svm->vmcb->save.rip = vcpu->svm->next_rip;
242 vcpu->svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK;
243}
244
245static int has_svm(void)
246{
247 uint32_t eax, ebx, ecx, edx;
248
249 if (current_cpu_data.x86_vendor != X86_VENDOR_AMD) {
250 printk(KERN_INFO "has_svm: not amd\n");
251 return 0;
252 }
253
254 cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
255 if (eax < SVM_CPUID_FUNC) {
256 printk(KERN_INFO "has_svm: can't execute cpuid_8000000a\n");
257 return 0;
258 }
259
260 cpuid(0x80000001, &eax, &ebx, &ecx, &edx);
261 if (!(ecx & (1 << SVM_CPUID_FEATURE_SHIFT))) {
262 printk(KERN_DEBUG "has_svm: svm not available\n");
263 return 0;
264 }
265 return 1;
266}
267
268static void svm_hardware_disable(void *garbage)
269{
270 struct svm_cpu_data *svm_data
271 = per_cpu(svm_data, raw_smp_processor_id());
272
273 if (svm_data) {
274 uint64_t efer;
275
276 wrmsrl(MSR_VM_HSAVE_PA, 0);
277 rdmsrl(MSR_EFER, efer);
278 wrmsrl(MSR_EFER, efer & ~MSR_EFER_SVME_MASK);
279 per_cpu(svm_data, raw_smp_processor_id()) = 0;
280 __free_page(svm_data->save_area);
281 kfree(svm_data);
282 }
283}
284
285static void svm_hardware_enable(void *garbage)
286{
287
288 struct svm_cpu_data *svm_data;
289 uint64_t efer;
290#ifdef __x86_64__
291 struct desc_ptr gdt_descr;
292#else
293 struct Xgt_desc_struct gdt_descr;
294#endif
295 struct desc_struct *gdt;
296 int me = raw_smp_processor_id();
297
298 if (!has_svm()) {
299 printk(KERN_ERR "svm_cpu_init: err EOPNOTSUPP on %d\n", me);
300 return;
301 }
302 svm_data = per_cpu(svm_data, me);
303
304 if (!svm_data) {
305 printk(KERN_ERR "svm_cpu_init: svm_data is NULL on %d\n",
306 me);
307 return;
308 }
309
310 svm_data->asid_generation = 1;
311 svm_data->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1;
312 svm_data->next_asid = svm_data->max_asid + 1;
313
314 asm volatile ( "sgdt %0" : "=m"(gdt_descr) );
315 gdt = (struct desc_struct *)gdt_descr.address;
316 svm_data->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
317
318 rdmsrl(MSR_EFER, efer);
319 wrmsrl(MSR_EFER, efer | MSR_EFER_SVME_MASK);
320
321 wrmsrl(MSR_VM_HSAVE_PA,
322 page_to_pfn(svm_data->save_area) << PAGE_SHIFT);
323}
324
325static int svm_cpu_init(int cpu)
326{
327 struct svm_cpu_data *svm_data;
328 int r;
329
330 svm_data = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL);
331 if (!svm_data)
332 return -ENOMEM;
333 svm_data->cpu = cpu;
334 svm_data->save_area = alloc_page(GFP_KERNEL);
335 r = -ENOMEM;
336 if (!svm_data->save_area)
337 goto err_1;
338
339 per_cpu(svm_data, cpu) = svm_data;
340
341 return 0;
342
343err_1:
344 kfree(svm_data);
345 return r;
346
347}
348
349static int set_msr_interception(u32 *msrpm, unsigned msr,
350 int read, int write)
351{
352 int i;
353
354 for (i = 0; i < NUM_MSR_MAPS; i++) {
355 if (msr >= msrpm_ranges[i] &&
356 msr < msrpm_ranges[i] + MSRS_IN_RANGE) {
357 u32 msr_offset = (i * MSRS_IN_RANGE + msr -
358 msrpm_ranges[i]) * 2;
359
360 u32 *base = msrpm + (msr_offset / 32);
361 u32 msr_shift = msr_offset % 32;
362 u32 mask = ((write) ? 0 : 2) | ((read) ? 0 : 1);
363 *base = (*base & ~(0x3 << msr_shift)) |
364 (mask << msr_shift);
365 return 1;
366 }
367 }
368 printk(KERN_DEBUG "%s: not found 0x%x\n", __FUNCTION__, msr);
369 return 0;
370}
371
372static __init int svm_hardware_setup(void)
373{
374 int cpu;
375 struct page *iopm_pages;
376 struct page *msrpm_pages;
377 void *msrpm_va;
378 int r;
379
380
381 iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER);
382
383 if (!iopm_pages)
384 return -ENOMEM;
385 memset(page_address(iopm_pages), 0xff,
386 PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
387 iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;
388
389
390 msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
391
392 r = -ENOMEM;
393 if (!msrpm_pages)
394 goto err_1;
395
396 msrpm_va = page_address(msrpm_pages);
397 memset(msrpm_va, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER));
398 msrpm_base = page_to_pfn(msrpm_pages) << PAGE_SHIFT;
399
400#ifdef __x86_64__
401 set_msr_interception(msrpm_va, MSR_GS_BASE, 1, 1);
402 set_msr_interception(msrpm_va, MSR_FS_BASE, 1, 1);
403 set_msr_interception(msrpm_va, MSR_KERNEL_GS_BASE, 1, 1);
404 set_msr_interception(msrpm_va, MSR_STAR, 1, 1);
405 set_msr_interception(msrpm_va, MSR_LSTAR, 1, 1);
406 set_msr_interception(msrpm_va, MSR_CSTAR, 1, 1);
407 set_msr_interception(msrpm_va, MSR_SYSCALL_MASK, 1, 1);
408#endif
409 set_msr_interception(msrpm_va, MSR_IA32_SYSENTER_CS, 1, 1);
410 set_msr_interception(msrpm_va, MSR_IA32_SYSENTER_ESP, 1, 1);
411 set_msr_interception(msrpm_va, MSR_IA32_SYSENTER_EIP, 1, 1);
412
413 for_each_online_cpu(cpu) {
414 r = svm_cpu_init(cpu);
415 if (r)
416 goto err_2;
417 }
418 return 0;
419
420err_2:
421 __free_pages(msrpm_pages, MSRPM_ALLOC_ORDER);
422 msrpm_base = 0;
423err_1:
424 __free_pages(iopm_pages, IOPM_ALLOC_ORDER);
425 iopm_base = 0;
426 return r;
427}
428
429static __exit void svm_hardware_unsetup(void)
430{
431 __free_pages(pfn_to_page(msrpm_base >> PAGE_SHIFT), MSRPM_ALLOC_ORDER);
432 __free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
433 iopm_base = msrpm_base = 0;
434}
435
436static void init_seg(struct vmcb_seg *seg)
437{
438 seg->selector = 0;
439 seg->attrib = SVM_SELECTOR_P_MASK | SVM_SELECTOR_S_MASK |
440 SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */
441 seg->limit = 0xffff;
442 seg->base = 0;
443}
444
445static void init_sys_seg(struct vmcb_seg *seg, uint32_t type)
446{
447 seg->selector = 0;
448 seg->attrib = SVM_SELECTOR_P_MASK | type;
449 seg->limit = 0xffff;
450 seg->base = 0;
451}
452
453static int svm_vcpu_setup(struct kvm_vcpu *vcpu)
454{
455 return 0;
456}
457
458static void init_vmcb(struct vmcb *vmcb)
459{
460 struct vmcb_control_area *control = &vmcb->control;
461 struct vmcb_save_area *save = &vmcb->save;
462 u64 tsc;
463
464 control->intercept_cr_read = INTERCEPT_CR0_MASK |
465 INTERCEPT_CR3_MASK |
466 INTERCEPT_CR4_MASK;
467
468 control->intercept_cr_write = INTERCEPT_CR0_MASK |
469 INTERCEPT_CR3_MASK |
470 INTERCEPT_CR4_MASK;
471
472 control->intercept_dr_read = INTERCEPT_DR0_MASK |
473 INTERCEPT_DR1_MASK |
474 INTERCEPT_DR2_MASK |
475 INTERCEPT_DR3_MASK;
476
477 control->intercept_dr_write = INTERCEPT_DR0_MASK |
478 INTERCEPT_DR1_MASK |
479 INTERCEPT_DR2_MASK |
480 INTERCEPT_DR3_MASK |
481 INTERCEPT_DR5_MASK |
482 INTERCEPT_DR7_MASK;
483
484 control->intercept_exceptions = 1 << PF_VECTOR;
485
486
487 control->intercept = (1ULL << INTERCEPT_INTR) |
488 (1ULL << INTERCEPT_NMI) |
489 /*
490 * selective cr0 intercept bug?
491 * 0: 0f 22 d8 mov %eax,%cr3
492 * 3: 0f 20 c0 mov %cr0,%eax
493 * 6: 0d 00 00 00 80 or $0x80000000,%eax
494 * b: 0f 22 c0 mov %eax,%cr0
495 * set cr3 ->interception
496 * get cr0 ->interception
497 * set cr0 -> no interception
498 */
499 /* (1ULL << INTERCEPT_SELECTIVE_CR0) | */
500 (1ULL << INTERCEPT_CPUID) |
501 (1ULL << INTERCEPT_HLT) |
502 (1ULL << INTERCEPT_INVLPG) |
503 (1ULL << INTERCEPT_INVLPGA) |
504 (1ULL << INTERCEPT_IOIO_PROT) |
505 (1ULL << INTERCEPT_MSR_PROT) |
506 (1ULL << INTERCEPT_TASK_SWITCH) |
507 (1ULL << INTERCEPT_VMRUN) |
508 (1ULL << INTERCEPT_VMMCALL) |
509 (1ULL << INTERCEPT_VMLOAD) |
510 (1ULL << INTERCEPT_VMSAVE) |
511 (1ULL << INTERCEPT_STGI) |
512 (1ULL << INTERCEPT_CLGI) |
513 (1ULL << INTERCEPT_SKINIT);
514
515 control->iopm_base_pa = iopm_base;
516 control->msrpm_base_pa = msrpm_base;
517 rdtscll(tsc);
518 control->tsc_offset = -tsc;
519 control->int_ctl = V_INTR_MASKING_MASK;
520
521 init_seg(&save->es);
522 init_seg(&save->ss);
523 init_seg(&save->ds);
524 init_seg(&save->fs);
525 init_seg(&save->gs);
526
527 save->cs.selector = 0xf000;
528 /* Executable/Readable Code Segment */
529 save->cs.attrib = SVM_SELECTOR_READ_MASK | SVM_SELECTOR_P_MASK |
530 SVM_SELECTOR_S_MASK | SVM_SELECTOR_CODE_MASK;
531 save->cs.limit = 0xffff;
532 save->cs.base = 0xffff0000;
533
534 save->gdtr.limit = 0xffff;
535 save->idtr.limit = 0xffff;
536
537 init_sys_seg(&save->ldtr, SEG_TYPE_LDT);
538 init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16);
539
540 save->efer = MSR_EFER_SVME_MASK;
541
542 save->dr6 = 0xffff0ff0;
543 save->dr7 = 0x400;
544 save->rflags = 2;
545 save->rip = 0x0000fff0;
546
547 /*
548 * cr0 val on cpu init should be 0x60000010, we enable cpu
549 * cache by default. the orderly way is to enable cache in bios.
550 */
551 save->cr0 = 0x00000010 | CR0_PG_MASK;
552 save->cr4 = CR4_PAE_MASK;
553 /* rdx = ?? */
554}
555
556static int svm_create_vcpu(struct kvm_vcpu *vcpu)
557{
558 struct page *page;
559 int r;
560
561 r = -ENOMEM;
562 vcpu->svm = kzalloc(sizeof *vcpu->svm, GFP_KERNEL);
563 if (!vcpu->svm)
564 goto out1;
565 page = alloc_page(GFP_KERNEL);
566 if (!page)
567 goto out2;
568
569 vcpu->svm->vmcb = page_address(page);
570 memset(vcpu->svm->vmcb, 0, PAGE_SIZE);
571 vcpu->svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT;
572 vcpu->svm->cr0 = 0x00000010;
573 vcpu->svm->asid_generation = 0;
574 memset(vcpu->svm->db_regs, 0, sizeof(vcpu->svm->db_regs));
575 init_vmcb(vcpu->svm->vmcb);
576
577 return 0;
578
579out2:
580 kfree(vcpu->svm);
581out1:
582 return r;
583}
584
585static void svm_free_vcpu(struct kvm_vcpu *vcpu)
586{
587 if (!vcpu->svm)
588 return;
589 if (vcpu->svm->vmcb)
590 __free_page(pfn_to_page(vcpu->svm->vmcb_pa >> PAGE_SHIFT));
591 kfree(vcpu->svm);
592}
593
594static struct kvm_vcpu *svm_vcpu_load(struct kvm_vcpu *vcpu)
595{
596 get_cpu();
597 return vcpu;
598}
599
600static void svm_vcpu_put(struct kvm_vcpu *vcpu)
601{
602 put_cpu();
603}
604
605static void svm_cache_regs(struct kvm_vcpu *vcpu)
606{
607 vcpu->regs[VCPU_REGS_RAX] = vcpu->svm->vmcb->save.rax;
608 vcpu->regs[VCPU_REGS_RSP] = vcpu->svm->vmcb->save.rsp;
609 vcpu->rip = vcpu->svm->vmcb->save.rip;
610}
611
612static void svm_decache_regs(struct kvm_vcpu *vcpu)
613{
614 vcpu->svm->vmcb->save.rax = vcpu->regs[VCPU_REGS_RAX];
615 vcpu->svm->vmcb->save.rsp = vcpu->regs[VCPU_REGS_RSP];
616 vcpu->svm->vmcb->save.rip = vcpu->rip;
617}
618
619static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu)
620{
621 return vcpu->svm->vmcb->save.rflags;
622}
623
624static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
625{
626 vcpu->svm->vmcb->save.rflags = rflags;
627}
628
629static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg)
630{
631 struct vmcb_save_area *save = &vcpu->svm->vmcb->save;
632
633 switch (seg) {
634 case VCPU_SREG_CS: return &save->cs;
635 case VCPU_SREG_DS: return &save->ds;
636 case VCPU_SREG_ES: return &save->es;
637 case VCPU_SREG_FS: return &save->fs;
638 case VCPU_SREG_GS: return &save->gs;
639 case VCPU_SREG_SS: return &save->ss;
640 case VCPU_SREG_TR: return &save->tr;
641 case VCPU_SREG_LDTR: return &save->ldtr;
642 }
643 BUG();
644 return 0;
645}
646
647static u64 svm_get_segment_base(struct kvm_vcpu *vcpu, int seg)
648{
649 struct vmcb_seg *s = svm_seg(vcpu, seg);
650
651 return s->base;
652}
653
654static void svm_get_segment(struct kvm_vcpu *vcpu,
655 struct kvm_segment *var, int seg)
656{
657 struct vmcb_seg *s = svm_seg(vcpu, seg);
658
659 var->base = s->base;
660 var->limit = s->limit;
661 var->selector = s->selector;
662 var->type = s->attrib & SVM_SELECTOR_TYPE_MASK;
663 var->s = (s->attrib >> SVM_SELECTOR_S_SHIFT) & 1;
664 var->dpl = (s->attrib >> SVM_SELECTOR_DPL_SHIFT) & 3;
665 var->present = (s->attrib >> SVM_SELECTOR_P_SHIFT) & 1;
666 var->avl = (s->attrib >> SVM_SELECTOR_AVL_SHIFT) & 1;
667 var->l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1;
668 var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;
669 var->g = (s->attrib >> SVM_SELECTOR_G_SHIFT) & 1;
670 var->unusable = !var->present;
671}
672
673static void svm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
674{
675 struct vmcb_seg *s = svm_seg(vcpu, VCPU_SREG_CS);
676
677 *db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;
678 *l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1;
679}
680
681static void svm_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
682{
683 dt->limit = vcpu->svm->vmcb->save.ldtr.limit;
684 dt->base = vcpu->svm->vmcb->save.ldtr.base;
685}
686
687static void svm_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
688{
689 vcpu->svm->vmcb->save.ldtr.limit = dt->limit;
690 vcpu->svm->vmcb->save.ldtr.base = dt->base ;
691}
692
693static void svm_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
694{
695 dt->limit = vcpu->svm->vmcb->save.gdtr.limit;
696 dt->base = vcpu->svm->vmcb->save.gdtr.base;
697}
698
699static void svm_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
700{
701 vcpu->svm->vmcb->save.gdtr.limit = dt->limit;
702 vcpu->svm->vmcb->save.gdtr.base = dt->base ;
703}
704
705static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
706{
707#ifdef __x86_64__
708 if (vcpu->shadow_efer & KVM_EFER_LME) {
709 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
710 vcpu->shadow_efer |= KVM_EFER_LMA;
711 vcpu->svm->vmcb->save.efer |= KVM_EFER_LMA | KVM_EFER_LME;
712 }
713
714 if (is_paging(vcpu) && !(cr0 & CR0_PG_MASK) ) {
715 vcpu->shadow_efer &= ~KVM_EFER_LMA;
716 vcpu->svm->vmcb->save.efer &= ~(KVM_EFER_LMA | KVM_EFER_LME);
717 }
718 }
719#endif
720 vcpu->svm->cr0 = cr0;
721 vcpu->svm->vmcb->save.cr0 = cr0 | CR0_PG_MASK;
722 vcpu->cr0 = cr0;
723}
724
725static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
726{
727 vcpu->cr4 = cr4;
728 vcpu->svm->vmcb->save.cr4 = cr4 | CR4_PAE_MASK;
729}
730
731static void svm_set_segment(struct kvm_vcpu *vcpu,
732 struct kvm_segment *var, int seg)
733{
734 struct vmcb_seg *s = svm_seg(vcpu, seg);
735
736 s->base = var->base;
737 s->limit = var->limit;
738 s->selector = var->selector;
739 if (var->unusable)
740 s->attrib = 0;
741 else {
742 s->attrib = (var->type & SVM_SELECTOR_TYPE_MASK);
743 s->attrib |= (var->s & 1) << SVM_SELECTOR_S_SHIFT;
744 s->attrib |= (var->dpl & 3) << SVM_SELECTOR_DPL_SHIFT;
745 s->attrib |= (var->present & 1) << SVM_SELECTOR_P_SHIFT;
746 s->attrib |= (var->avl & 1) << SVM_SELECTOR_AVL_SHIFT;
747 s->attrib |= (var->l & 1) << SVM_SELECTOR_L_SHIFT;
748 s->attrib |= (var->db & 1) << SVM_SELECTOR_DB_SHIFT;
749 s->attrib |= (var->g & 1) << SVM_SELECTOR_G_SHIFT;
750 }
751 if (seg == VCPU_SREG_CS)
752 vcpu->svm->vmcb->save.cpl
753 = (vcpu->svm->vmcb->save.cs.attrib
754 >> SVM_SELECTOR_DPL_SHIFT) & 3;
755
756}
757
758/* FIXME:
759
760 vcpu->svm->vmcb->control.int_ctl &= ~V_TPR_MASK;
761 vcpu->svm->vmcb->control.int_ctl |= (sregs->cr8 & V_TPR_MASK);
762
763*/
764
765static int svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_debug_guest *dbg)
766{
767 return -EOPNOTSUPP;
768}
769
770static void load_host_msrs(struct kvm_vcpu *vcpu)
771{
772 int i;
773
774 for ( i = 0; i < NR_HOST_SAVE_MSRS; i++)
775 wrmsrl(host_save_msrs[i], vcpu->svm->host_msrs[i]);
776}
777
778static void save_host_msrs(struct kvm_vcpu *vcpu)
779{
780 int i;
781
782 for ( i = 0; i < NR_HOST_SAVE_MSRS; i++)
783 rdmsrl(host_save_msrs[i], vcpu->svm->host_msrs[i]);
784}
785
786static void new_asid(struct kvm_vcpu *vcpu, struct svm_cpu_data *svm_data)
787{
788 if (svm_data->next_asid > svm_data->max_asid) {
789 ++svm_data->asid_generation;
790 svm_data->next_asid = 1;
791 vcpu->svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;
792 }
793
794 vcpu->cpu = svm_data->cpu;
795 vcpu->svm->asid_generation = svm_data->asid_generation;
796 vcpu->svm->vmcb->control.asid = svm_data->next_asid++;
797}
798
799static void svm_invlpg(struct kvm_vcpu *vcpu, gva_t address)
800{
801 invlpga(address, vcpu->svm->vmcb->control.asid); // is needed?
802}
803
804static unsigned long svm_get_dr(struct kvm_vcpu *vcpu, int dr)
805{
806 return vcpu->svm->db_regs[dr];
807}
808
809static void svm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long value,
810 int *exception)
811{
812 *exception = 0;
813
814 if (vcpu->svm->vmcb->save.dr7 & DR7_GD_MASK) {
815 vcpu->svm->vmcb->save.dr7 &= ~DR7_GD_MASK;
816 vcpu->svm->vmcb->save.dr6 |= DR6_BD_MASK;
817 *exception = DB_VECTOR;
818 return;
819 }
820
821 switch (dr) {
822 case 0 ... 3:
823 vcpu->svm->db_regs[dr] = value;
824 return;
825 case 4 ... 5:
826 if (vcpu->cr4 & CR4_DE_MASK) {
827 *exception = UD_VECTOR;
828 return;
829 }
830 case 7: {
831 if (value & ~((1ULL << 32) - 1)) {
832 *exception = GP_VECTOR;
833 return;
834 }
835 vcpu->svm->vmcb->save.dr7 = value;
836 return;
837 }
838 default:
839 printk(KERN_DEBUG "%s: unexpected dr %u\n",
840 __FUNCTION__, dr);
841 *exception = UD_VECTOR;
842 return;
843 }
844}
845
846static int pf_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
847{
848 u32 exit_int_info = vcpu->svm->vmcb->control.exit_int_info;
849 u64 fault_address;
850 u32 error_code;
851 enum emulation_result er;
852
853 if (is_external_interrupt(exit_int_info))
854 push_irq(vcpu, exit_int_info & SVM_EVTINJ_VEC_MASK);
855
856 spin_lock(&vcpu->kvm->lock);
857
858 fault_address = vcpu->svm->vmcb->control.exit_info_2;
859 error_code = vcpu->svm->vmcb->control.exit_info_1;
860 if (!vcpu->mmu.page_fault(vcpu, fault_address, error_code)) {
861 spin_unlock(&vcpu->kvm->lock);
862 return 1;
863 }
864 er = emulate_instruction(vcpu, kvm_run, fault_address, error_code);
865 spin_unlock(&vcpu->kvm->lock);
866
867 switch (er) {
868 case EMULATE_DONE:
869 return 1;
870 case EMULATE_DO_MMIO:
871 ++kvm_stat.mmio_exits;
872 kvm_run->exit_reason = KVM_EXIT_MMIO;
873 return 0;
874 case EMULATE_FAIL:
875 vcpu_printf(vcpu, "%s: emulate fail\n", __FUNCTION__);
876 break;
877 default:
878 BUG();
879 }
880
881 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
882 return 0;
883}
884
885static int io_get_override(struct kvm_vcpu *vcpu,
886 struct vmcb_seg **seg,
887 int *addr_override)
888{
889 u8 inst[MAX_INST_SIZE];
890 unsigned ins_length;
891 gva_t rip;
892 int i;
893
894 rip = vcpu->svm->vmcb->save.rip;
895 ins_length = vcpu->svm->next_rip - rip;
896 rip += vcpu->svm->vmcb->save.cs.base;
897
898 if (ins_length > MAX_INST_SIZE)
899 printk(KERN_DEBUG
900 "%s: inst length err, cs base 0x%llx rip 0x%llx "
901 "next rip 0x%llx ins_length %u\n",
902 __FUNCTION__,
903 vcpu->svm->vmcb->save.cs.base,
904 vcpu->svm->vmcb->save.rip,
905 vcpu->svm->vmcb->control.exit_info_2,
906 ins_length);
907
908 if (kvm_read_guest(vcpu, rip, ins_length, inst) != ins_length)
909 /* #PF */
910 return 0;
911
912 *addr_override = 0;
913 *seg = 0;
914 for (i = 0; i < ins_length; i++)
915 switch (inst[i]) {
916 case 0xf0:
917 case 0xf2:
918 case 0xf3:
919 case 0x66:
920 continue;
921 case 0x67:
922 *addr_override = 1;
923 continue;
924 case 0x2e:
925 *seg = &vcpu->svm->vmcb->save.cs;
926 continue;
927 case 0x36:
928 *seg = &vcpu->svm->vmcb->save.ss;
929 continue;
930 case 0x3e:
931 *seg = &vcpu->svm->vmcb->save.ds;
932 continue;
933 case 0x26:
934 *seg = &vcpu->svm->vmcb->save.es;
935 continue;
936 case 0x64:
937 *seg = &vcpu->svm->vmcb->save.fs;
938 continue;
939 case 0x65:
940 *seg = &vcpu->svm->vmcb->save.gs;
941 continue;
942 default:
943 return 1;
944 }
945 printk(KERN_DEBUG "%s: unexpected\n", __FUNCTION__);
946 return 0;
947}
948
949static unsigned long io_adress(struct kvm_vcpu *vcpu, int ins, u64 *address)
950{
951 unsigned long addr_mask;
952 unsigned long *reg;
953 struct vmcb_seg *seg;
954 int addr_override;
955 struct vmcb_save_area *save_area = &vcpu->svm->vmcb->save;
956 u16 cs_attrib = save_area->cs.attrib;
957 unsigned addr_size = get_addr_size(vcpu);
958
959 if (!io_get_override(vcpu, &seg, &addr_override))
960 return 0;
961
962 if (addr_override)
963 addr_size = (addr_size == 2) ? 4: (addr_size >> 1);
964
965 if (ins) {
966 reg = &vcpu->regs[VCPU_REGS_RDI];
967 seg = &vcpu->svm->vmcb->save.es;
968 } else {
969 reg = &vcpu->regs[VCPU_REGS_RSI];
970 seg = (seg) ? seg : &vcpu->svm->vmcb->save.ds;
971 }
972
973 addr_mask = ~0ULL >> (64 - (addr_size * 8));
974
975 if ((cs_attrib & SVM_SELECTOR_L_MASK) &&
976 !(vcpu->svm->vmcb->save.rflags & X86_EFLAGS_VM)) {
977 *address = (*reg & addr_mask);
978 return addr_mask;
979 }
980
981 if (!(seg->attrib & SVM_SELECTOR_P_SHIFT)) {
982 svm_inject_gp(vcpu, 0);
983 return 0;
984 }
985
986 *address = (*reg & addr_mask) + seg->base;
987 return addr_mask;
988}
989
990static int io_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
991{
992 u32 io_info = vcpu->svm->vmcb->control.exit_info_1; //address size bug?
993 int _in = io_info & SVM_IOIO_TYPE_MASK;
994
995 ++kvm_stat.io_exits;
996
997 vcpu->svm->next_rip = vcpu->svm->vmcb->control.exit_info_2;
998
999 kvm_run->exit_reason = KVM_EXIT_IO;
1000 kvm_run->io.port = io_info >> 16;
1001 kvm_run->io.direction = (_in) ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1002 kvm_run->io.size = ((io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT);
1003 kvm_run->io.string = (io_info & SVM_IOIO_STR_MASK) != 0;
1004 kvm_run->io.rep = (io_info & SVM_IOIO_REP_MASK) != 0;
1005
1006 if (kvm_run->io.string) {
1007 unsigned addr_mask;
1008
1009 addr_mask = io_adress(vcpu, _in, &kvm_run->io.address);
1010 if (!addr_mask) {
1011 printk(KERN_DEBUG "%s: get io address failed\n", __FUNCTION__);
1012 return 1;
1013 }
1014
1015 if (kvm_run->io.rep) {
1016 kvm_run->io.count = vcpu->regs[VCPU_REGS_RCX] & addr_mask;
1017 kvm_run->io.string_down = (vcpu->svm->vmcb->save.rflags
1018 & X86_EFLAGS_DF) != 0;
1019 }
1020 } else {
1021 kvm_run->io.value = vcpu->svm->vmcb->save.rax;
1022 }
1023 return 0;
1024}
1025
1026
1027static int nop_on_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1028{
1029 return 1;
1030}
1031
1032static int halt_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1033{
1034 vcpu->svm->next_rip = vcpu->svm->vmcb->save.rip + 1;
1035 skip_emulated_instruction(vcpu);
1036 if (vcpu->irq_summary && (vcpu->svm->vmcb->save.rflags & X86_EFLAGS_IF))
1037 return 1;
1038
1039 kvm_run->exit_reason = KVM_EXIT_HLT;
1040 return 0;
1041}
1042
1043static int invalid_op_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1044{
1045 inject_ud(vcpu);
1046 return 1;
1047}
1048
1049static int task_switch_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1050{
1051 printk(KERN_DEBUG "%s: task swiche is unsupported\n", __FUNCTION__);
1052 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
1053 return 0;
1054}
1055
1056static int cpuid_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1057{
1058 vcpu->svm->next_rip = vcpu->svm->vmcb->save.rip + 2;
1059 kvm_run->exit_reason = KVM_EXIT_CPUID;
1060 return 0;
1061}
1062
1063static int emulate_on_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1064{
1065 if (emulate_instruction(vcpu, 0, 0, 0) != EMULATE_DONE)
1066 printk(KERN_ERR "%s: failed\n", __FUNCTION__);
1067 return 1;
1068}
1069
1070static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data)
1071{
1072 switch (ecx) {
1073 case MSR_IA32_MC0_CTL:
1074 case MSR_IA32_MCG_STATUS:
1075 case MSR_IA32_MCG_CAP:
1076 case MSR_IA32_MC0_MISC:
1077 case MSR_IA32_MC0_MISC+4:
1078 case MSR_IA32_MC0_MISC+8:
1079 case MSR_IA32_MC0_MISC+12:
1080 case MSR_IA32_MC0_MISC+16:
1081 case MSR_IA32_UCODE_REV:
1082 /* MTRR registers */
1083 case 0xfe:
1084 case 0x200 ... 0x2ff:
1085 *data = 0;
1086 break;
1087 case MSR_IA32_TIME_STAMP_COUNTER: {
1088 u64 tsc;
1089
1090 rdtscll(tsc);
1091 *data = vcpu->svm->vmcb->control.tsc_offset + tsc;
1092 break;
1093 }
1094 case MSR_EFER:
1095 *data = vcpu->shadow_efer;
1096 break;
1097 case MSR_IA32_APICBASE:
1098 *data = vcpu->apic_base;
1099 break;
1100#ifdef __x86_64__
1101 case MSR_STAR:
1102 *data = vcpu->svm->vmcb->save.star;
1103 break;
1104 case MSR_LSTAR:
1105 *data = vcpu->svm->vmcb->save.lstar;
1106 break;
1107 case MSR_CSTAR:
1108 *data = vcpu->svm->vmcb->save.cstar;
1109 break;
1110 case MSR_KERNEL_GS_BASE:
1111 *data = vcpu->svm->vmcb->save.kernel_gs_base;
1112 break;
1113 case MSR_SYSCALL_MASK:
1114 *data = vcpu->svm->vmcb->save.sfmask;
1115 break;
1116#endif
1117 case MSR_IA32_SYSENTER_CS:
1118 *data = vcpu->svm->vmcb->save.sysenter_cs;
1119 break;
1120 case MSR_IA32_SYSENTER_EIP:
1121 *data = vcpu->svm->vmcb->save.sysenter_eip;
1122 break;
1123 case MSR_IA32_SYSENTER_ESP:
1124 *data = vcpu->svm->vmcb->save.sysenter_esp;
1125 break;
1126 default:
1127 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", ecx);
1128 return 1;
1129 }
1130 return 0;
1131}
1132
1133static int rdmsr_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1134{
1135 u32 ecx = vcpu->regs[VCPU_REGS_RCX];
1136 u64 data;
1137
1138 if (svm_get_msr(vcpu, ecx, &data))
1139 svm_inject_gp(vcpu, 0);
1140 else {
1141 vcpu->svm->vmcb->save.rax = data & 0xffffffff;
1142 vcpu->regs[VCPU_REGS_RDX] = data >> 32;
1143 vcpu->svm->next_rip = vcpu->svm->vmcb->save.rip + 2;
1144 skip_emulated_instruction(vcpu);
1145 }
1146 return 1;
1147}
1148
1149static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
1150{
1151 switch (ecx) {
1152#ifdef __x86_64__
1153 case MSR_EFER:
1154 set_efer(vcpu, data);
1155 break;
1156#endif
1157 case MSR_IA32_MC0_STATUS:
1158 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n"
1159 , __FUNCTION__, data);
1160 break;
1161 case MSR_IA32_TIME_STAMP_COUNTER: {
1162 u64 tsc;
1163
1164 rdtscll(tsc);
1165 vcpu->svm->vmcb->control.tsc_offset = data - tsc;
1166 break;
1167 }
1168 case MSR_IA32_UCODE_REV:
1169 case MSR_IA32_UCODE_WRITE:
1170 case 0x200 ... 0x2ff: /* MTRRs */
1171 break;
1172 case MSR_IA32_APICBASE:
1173 vcpu->apic_base = data;
1174 break;
1175#ifdef __x86_64___
1176 case MSR_STAR:
1177 vcpu->svm->vmcb->save.star = data;
1178 break;
1179 case MSR_LSTAR:
1180 vcpu->svm->vmcb->save.lstar = data;
1181 break;
1182 case MSR_CSTAR:
1183 vcpu->svm->vmcb->save.cstar = data;
1184 break;
1185 case MSR_KERNEL_GS_BASE:
1186 vcpu->svm->vmcb->save.kernel_gs_base = data;
1187 break;
1188 case MSR_SYSCALL_MASK:
1189 vcpu->svm->vmcb->save.sfmask = data;
1190 break;
1191#endif
1192 case MSR_IA32_SYSENTER_CS:
1193 vcpu->svm->vmcb->save.sysenter_cs = data;
1194 break;
1195 case MSR_IA32_SYSENTER_EIP:
1196 vcpu->svm->vmcb->save.sysenter_eip = data;
1197 break;
1198 case MSR_IA32_SYSENTER_ESP:
1199 vcpu->svm->vmcb->save.sysenter_esp = data;
1200 break;
1201 default:
1202 printk(KERN_ERR "kvm: unhandled wrmsr: %x\n", ecx);
1203 return 1;
1204 }
1205 return 0;
1206}
1207
1208static int wrmsr_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1209{
1210 u32 ecx = vcpu->regs[VCPU_REGS_RCX];
1211 u64 data = (vcpu->svm->vmcb->save.rax & -1u)
1212 | ((u64)(vcpu->regs[VCPU_REGS_RDX] & -1u) << 32);
1213 vcpu->svm->next_rip = vcpu->svm->vmcb->save.rip + 2;
1214 if (svm_set_msr(vcpu, ecx, data))
1215 svm_inject_gp(vcpu, 0);
1216 else
1217 skip_emulated_instruction(vcpu);
1218 return 1;
1219}
1220
1221static int msr_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1222{
1223 if (vcpu->svm->vmcb->control.exit_info_1)
1224 return wrmsr_interception(vcpu, kvm_run);
1225 else
1226 return rdmsr_interception(vcpu, kvm_run);
1227}
1228
1229static int (*svm_exit_handlers[])(struct kvm_vcpu *vcpu,
1230 struct kvm_run *kvm_run) = {
1231 [SVM_EXIT_READ_CR0] = emulate_on_interception,
1232 [SVM_EXIT_READ_CR3] = emulate_on_interception,
1233 [SVM_EXIT_READ_CR4] = emulate_on_interception,
1234 /* for now: */
1235 [SVM_EXIT_WRITE_CR0] = emulate_on_interception,
1236 [SVM_EXIT_WRITE_CR3] = emulate_on_interception,
1237 [SVM_EXIT_WRITE_CR4] = emulate_on_interception,
1238 [SVM_EXIT_READ_DR0] = emulate_on_interception,
1239 [SVM_EXIT_READ_DR1] = emulate_on_interception,
1240 [SVM_EXIT_READ_DR2] = emulate_on_interception,
1241 [SVM_EXIT_READ_DR3] = emulate_on_interception,
1242 [SVM_EXIT_WRITE_DR0] = emulate_on_interception,
1243 [SVM_EXIT_WRITE_DR1] = emulate_on_interception,
1244 [SVM_EXIT_WRITE_DR2] = emulate_on_interception,
1245 [SVM_EXIT_WRITE_DR3] = emulate_on_interception,
1246 [SVM_EXIT_WRITE_DR5] = emulate_on_interception,
1247 [SVM_EXIT_WRITE_DR7] = emulate_on_interception,
1248 [SVM_EXIT_EXCP_BASE + PF_VECTOR] = pf_interception,
1249 [SVM_EXIT_INTR] = nop_on_interception,
1250 [SVM_EXIT_NMI] = nop_on_interception,
1251 [SVM_EXIT_SMI] = nop_on_interception,
1252 [SVM_EXIT_INIT] = nop_on_interception,
1253 /* [SVM_EXIT_CR0_SEL_WRITE] = emulate_on_interception, */
1254 [SVM_EXIT_CPUID] = cpuid_interception,
1255 [SVM_EXIT_HLT] = halt_interception,
1256 [SVM_EXIT_INVLPG] = emulate_on_interception,
1257 [SVM_EXIT_INVLPGA] = invalid_op_interception,
1258 [SVM_EXIT_IOIO] = io_interception,
1259 [SVM_EXIT_MSR] = msr_interception,
1260 [SVM_EXIT_TASK_SWITCH] = task_switch_interception,
1261 [SVM_EXIT_VMRUN] = invalid_op_interception,
1262 [SVM_EXIT_VMMCALL] = invalid_op_interception,
1263 [SVM_EXIT_VMLOAD] = invalid_op_interception,
1264 [SVM_EXIT_VMSAVE] = invalid_op_interception,
1265 [SVM_EXIT_STGI] = invalid_op_interception,
1266 [SVM_EXIT_CLGI] = invalid_op_interception,
1267 [SVM_EXIT_SKINIT] = invalid_op_interception,
1268};
1269
1270
1271static int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1272{
1273 u32 exit_code = vcpu->svm->vmcb->control.exit_code;
1274
1275 kvm_run->exit_type = KVM_EXIT_TYPE_VM_EXIT;
1276
1277 if (is_external_interrupt(vcpu->svm->vmcb->control.exit_int_info) &&
1278 exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR)
1279 printk(KERN_ERR "%s: unexpected exit_ini_info 0x%x "
1280 "exit_code 0x%x\n",
1281 __FUNCTION__, vcpu->svm->vmcb->control.exit_int_info,
1282 exit_code);
1283
1284 if (exit_code >= sizeof(svm_exit_handlers) / sizeof(*svm_exit_handlers)
1285 || svm_exit_handlers[exit_code] == 0) {
1286 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
1287 printk(KERN_ERR "%s: 0x%x @ 0x%llx cr0 0x%lx rflags 0x%llx\n",
1288 __FUNCTION__,
1289 exit_code,
1290 vcpu->svm->vmcb->save.rip,
1291 vcpu->cr0,
1292 vcpu->svm->vmcb->save.rflags);
1293 return 0;
1294 }
1295
1296 return svm_exit_handlers[exit_code](vcpu, kvm_run);
1297}
1298
1299static void reload_tss(struct kvm_vcpu *vcpu)
1300{
1301 int cpu = raw_smp_processor_id();
1302
1303 struct svm_cpu_data *svm_data = per_cpu(svm_data, cpu);
1304 svm_data->tss_desc->type = 9; //available 32/64-bit TSS
1305 load_TR_desc();
1306}
1307
1308static void pre_svm_run(struct kvm_vcpu *vcpu)
1309{
1310 int cpu = raw_smp_processor_id();
1311
1312 struct svm_cpu_data *svm_data = per_cpu(svm_data, cpu);
1313
1314 vcpu->svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;
1315 if (vcpu->cpu != cpu ||
1316 vcpu->svm->asid_generation != svm_data->asid_generation)
1317 new_asid(vcpu, svm_data);
1318}
1319
1320
1321static inline void kvm_try_inject_irq(struct kvm_vcpu *vcpu)
1322{
1323 struct vmcb_control_area *control;
1324
1325 if (!vcpu->irq_summary)
1326 return;
1327
1328 control = &vcpu->svm->vmcb->control;
1329
1330 control->int_vector = pop_irq(vcpu);
1331 control->int_ctl &= ~V_INTR_PRIO_MASK;
1332 control->int_ctl |= V_IRQ_MASK |
1333 ((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT);
1334}
1335
1336static void kvm_reput_irq(struct kvm_vcpu *vcpu)
1337{
1338 struct vmcb_control_area *control = &vcpu->svm->vmcb->control;
1339
1340 if (control->int_ctl & V_IRQ_MASK) {
1341 control->int_ctl &= ~V_IRQ_MASK;
1342 push_irq(vcpu, control->int_vector);
1343 }
1344}
1345
1346static void save_db_regs(unsigned long *db_regs)
1347{
1348#ifdef __x86_64__
1349 asm ("mov %%dr0, %%rax \n\t"
1350 "mov %%rax, %[dr0] \n\t"
1351 "mov %%dr1, %%rax \n\t"
1352 "mov %%rax, %[dr1] \n\t"
1353 "mov %%dr2, %%rax \n\t"
1354 "mov %%rax, %[dr2] \n\t"
1355 "mov %%dr3, %%rax \n\t"
1356 "mov %%rax, %[dr3] \n\t"
1357 : [dr0] "=m"(db_regs[0]),
1358 [dr1] "=m"(db_regs[1]),
1359 [dr2] "=m"(db_regs[2]),
1360 [dr3] "=m"(db_regs[3])
1361 : : "rax");
1362#else
1363 asm ("mov %%dr0, %%eax \n\t"
1364 "mov %%eax, %[dr0] \n\t"
1365 "mov %%dr1, %%eax \n\t"
1366 "mov %%eax, %[dr1] \n\t"
1367 "mov %%dr2, %%eax \n\t"
1368 "mov %%eax, %[dr2] \n\t"
1369 "mov %%dr3, %%eax \n\t"
1370 "mov %%eax, %[dr3] \n\t"
1371 : [dr0] "=m"(db_regs[0]),
1372 [dr1] "=m"(db_regs[1]),
1373 [dr2] "=m"(db_regs[2]),
1374 [dr3] "=m"(db_regs[3])
1375 : : "eax");
1376#endif
1377}
1378
1379static void load_db_regs(unsigned long *db_regs)
1380{
1381 asm volatile ("mov %[dr0], %%dr0 \n\t"
1382 "mov %[dr1], %%dr1 \n\t"
1383 "mov %[dr2], %%dr2 \n\t"
1384 "mov %[dr3], %%dr3 \n\t"
1385 :
1386 : [dr0] "r"(db_regs[0]),
1387 [dr1] "r"(db_regs[1]),
1388 [dr2] "r"(db_regs[2]),
1389 [dr3] "r"(db_regs[3])
1390#ifdef __x86_64__
1391 : "rax");
1392#else
1393 : "eax");
1394#endif
1395}
1396
1397static int svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1398{
1399 u16 fs_selector;
1400 u16 gs_selector;
1401 u16 ldt_selector;
1402
1403again:
1404 kvm_try_inject_irq(vcpu);
1405
1406 clgi();
1407
1408 pre_svm_run(vcpu);
1409
1410 save_host_msrs(vcpu);
1411 fs_selector = read_fs();
1412 gs_selector = read_gs();
1413 ldt_selector = read_ldt();
1414 vcpu->svm->host_cr2 = kvm_read_cr2();
1415 vcpu->svm->host_dr6 = read_dr6();
1416 vcpu->svm->host_dr7 = read_dr7();
1417 vcpu->svm->vmcb->save.cr2 = vcpu->cr2;
1418
1419 if (vcpu->svm->vmcb->save.dr7 & 0xff) {
1420 write_dr7(0);
1421 save_db_regs(vcpu->svm->host_db_regs);
1422 load_db_regs(vcpu->svm->db_regs);
1423 }
1424 asm volatile (
1425#ifdef __x86_64__
1426 "push %%rbx; push %%rcx; push %%rdx;"
1427 "push %%rsi; push %%rdi; push %%rbp;"
1428 "push %%r8; push %%r9; push %%r10; push %%r11;"
1429 "push %%r12; push %%r13; push %%r14; push %%r15;"
1430#else
1431 "push %%ebx; push %%ecx; push %%edx;"
1432 "push %%esi; push %%edi; push %%ebp;"
1433#endif
1434
1435#ifdef __x86_64__
1436 "mov %c[rbx](%[vcpu]), %%rbx \n\t"
1437 "mov %c[rcx](%[vcpu]), %%rcx \n\t"
1438 "mov %c[rdx](%[vcpu]), %%rdx \n\t"
1439 "mov %c[rsi](%[vcpu]), %%rsi \n\t"
1440 "mov %c[rdi](%[vcpu]), %%rdi \n\t"
1441 "mov %c[rbp](%[vcpu]), %%rbp \n\t"
1442 "mov %c[r8](%[vcpu]), %%r8 \n\t"
1443 "mov %c[r9](%[vcpu]), %%r9 \n\t"
1444 "mov %c[r10](%[vcpu]), %%r10 \n\t"
1445 "mov %c[r11](%[vcpu]), %%r11 \n\t"
1446 "mov %c[r12](%[vcpu]), %%r12 \n\t"
1447 "mov %c[r13](%[vcpu]), %%r13 \n\t"
1448 "mov %c[r14](%[vcpu]), %%r14 \n\t"
1449 "mov %c[r15](%[vcpu]), %%r15 \n\t"
1450#else
1451 "mov %c[rbx](%[vcpu]), %%ebx \n\t"
1452 "mov %c[rcx](%[vcpu]), %%ecx \n\t"
1453 "mov %c[rdx](%[vcpu]), %%edx \n\t"
1454 "mov %c[rsi](%[vcpu]), %%esi \n\t"
1455 "mov %c[rdi](%[vcpu]), %%edi \n\t"
1456 "mov %c[rbp](%[vcpu]), %%ebp \n\t"
1457#endif
1458
1459#ifdef __x86_64__
1460 /* Enter guest mode */
1461 "push %%rax \n\t"
1462 "mov %c[svm](%[vcpu]), %%rax \n\t"
1463 "mov %c[vmcb](%%rax), %%rax \n\t"
1464 SVM_VMLOAD "\n\t"
1465 SVM_VMRUN "\n\t"
1466 SVM_VMSAVE "\n\t"
1467 "pop %%rax \n\t"
1468#else
1469 /* Enter guest mode */
1470 "push %%eax \n\t"
1471 "mov %c[svm](%[vcpu]), %%eax \n\t"
1472 "mov %c[vmcb](%%eax), %%eax \n\t"
1473 SVM_VMLOAD "\n\t"
1474 SVM_VMRUN "\n\t"
1475 SVM_VMSAVE "\n\t"
1476 "pop %%eax \n\t"
1477#endif
1478
1479 /* Save guest registers, load host registers */
1480#ifdef __x86_64__
1481 "mov %%rbx, %c[rbx](%[vcpu]) \n\t"
1482 "mov %%rcx, %c[rcx](%[vcpu]) \n\t"
1483 "mov %%rdx, %c[rdx](%[vcpu]) \n\t"
1484 "mov %%rsi, %c[rsi](%[vcpu]) \n\t"
1485 "mov %%rdi, %c[rdi](%[vcpu]) \n\t"
1486 "mov %%rbp, %c[rbp](%[vcpu]) \n\t"
1487 "mov %%r8, %c[r8](%[vcpu]) \n\t"
1488 "mov %%r9, %c[r9](%[vcpu]) \n\t"
1489 "mov %%r10, %c[r10](%[vcpu]) \n\t"
1490 "mov %%r11, %c[r11](%[vcpu]) \n\t"
1491 "mov %%r12, %c[r12](%[vcpu]) \n\t"
1492 "mov %%r13, %c[r13](%[vcpu]) \n\t"
1493 "mov %%r14, %c[r14](%[vcpu]) \n\t"
1494 "mov %%r15, %c[r15](%[vcpu]) \n\t"
1495
1496 "pop %%r15; pop %%r14; pop %%r13; pop %%r12;"
1497 "pop %%r11; pop %%r10; pop %%r9; pop %%r8;"
1498 "pop %%rbp; pop %%rdi; pop %%rsi;"
1499 "pop %%rdx; pop %%rcx; pop %%rbx; \n\t"
1500#else
1501 "mov %%ebx, %c[rbx](%[vcpu]) \n\t"
1502 "mov %%ecx, %c[rcx](%[vcpu]) \n\t"
1503 "mov %%edx, %c[rdx](%[vcpu]) \n\t"
1504 "mov %%esi, %c[rsi](%[vcpu]) \n\t"
1505 "mov %%edi, %c[rdi](%[vcpu]) \n\t"
1506 "mov %%ebp, %c[rbp](%[vcpu]) \n\t"
1507
1508 "pop %%ebp; pop %%edi; pop %%esi;"
1509 "pop %%edx; pop %%ecx; pop %%ebx; \n\t"
1510#endif
1511 :
1512 : [vcpu]"a"(vcpu),
1513 [svm]"i"(offsetof(struct kvm_vcpu, svm)),
1514 [vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)),
1515 [rbx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RBX])),
1516 [rcx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RCX])),
1517 [rdx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RDX])),
1518 [rsi]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RSI])),
1519 [rdi]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RDI])),
1520 [rbp]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RBP]))
1521#ifdef __x86_64__
1522 ,[r8 ]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R8 ])),
1523 [r9 ]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R9 ])),
1524 [r10]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R10])),
1525 [r11]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R11])),
1526 [r12]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R12])),
1527 [r13]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R13])),
1528 [r14]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R14])),
1529 [r15]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R15]))
1530#endif
1531 : "cc", "memory" );
1532
1533 if ((vcpu->svm->vmcb->save.dr7 & 0xff))
1534 load_db_regs(vcpu->svm->host_db_regs);
1535
1536 vcpu->cr2 = vcpu->svm->vmcb->save.cr2;
1537
1538 write_dr6(vcpu->svm->host_dr6);
1539 write_dr7(vcpu->svm->host_dr7);
1540 kvm_write_cr2(vcpu->svm->host_cr2);
1541
1542 load_fs(fs_selector);
1543 load_gs(gs_selector);
1544 load_ldt(ldt_selector);
1545 load_host_msrs(vcpu);
1546
1547 reload_tss(vcpu);
1548
1549 stgi();
1550
1551 kvm_reput_irq(vcpu);
1552
1553 vcpu->svm->next_rip = 0;
1554
1555 if (vcpu->svm->vmcb->control.exit_code == SVM_EXIT_ERR) {
1556 kvm_run->exit_type = KVM_EXIT_TYPE_FAIL_ENTRY;
1557 kvm_run->exit_reason = vcpu->svm->vmcb->control.exit_code;
1558 return 0;
1559 }
1560
1561 if (handle_exit(vcpu, kvm_run)) {
1562 if (signal_pending(current)) {
1563 ++kvm_stat.signal_exits;
1564 return -EINTR;
1565 }
1566 kvm_resched(vcpu);
1567 goto again;
1568 }
1569 return 0;
1570}
1571
1572static void svm_flush_tlb(struct kvm_vcpu *vcpu)
1573{
1574 force_new_asid(vcpu);
1575}
1576
1577static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
1578{
1579 vcpu->svm->vmcb->save.cr3 = root;
1580 force_new_asid(vcpu);
1581}
1582
1583static void svm_inject_page_fault(struct kvm_vcpu *vcpu,
1584 unsigned long addr,
1585 uint32_t err_code)
1586{
1587 uint32_t exit_int_info = vcpu->svm->vmcb->control.exit_int_info;
1588
1589 ++kvm_stat.pf_guest;
1590
1591 if (is_page_fault(exit_int_info)) {
1592
1593 vcpu->svm->vmcb->control.event_inj_err = 0;
1594 vcpu->svm->vmcb->control.event_inj = SVM_EVTINJ_VALID |
1595 SVM_EVTINJ_VALID_ERR |
1596 SVM_EVTINJ_TYPE_EXEPT |
1597 DF_VECTOR;
1598 return;
1599 }
1600 vcpu->cr2 = addr;
1601 vcpu->svm->vmcb->save.cr2 = addr;
1602 vcpu->svm->vmcb->control.event_inj = SVM_EVTINJ_VALID |
1603 SVM_EVTINJ_VALID_ERR |
1604 SVM_EVTINJ_TYPE_EXEPT |
1605 PF_VECTOR;
1606 vcpu->svm->vmcb->control.event_inj_err = err_code;
1607}
1608
1609
1610static int is_disabled(void)
1611{
1612 return 0;
1613}
1614
1615static struct kvm_arch_ops svm_arch_ops = {
1616 .cpu_has_kvm_support = has_svm,
1617 .disabled_by_bios = is_disabled,
1618 .hardware_setup = svm_hardware_setup,
1619 .hardware_unsetup = svm_hardware_unsetup,
1620 .hardware_enable = svm_hardware_enable,
1621 .hardware_disable = svm_hardware_disable,
1622
1623 .vcpu_create = svm_create_vcpu,
1624 .vcpu_free = svm_free_vcpu,
1625
1626 .vcpu_load = svm_vcpu_load,
1627 .vcpu_put = svm_vcpu_put,
1628
1629 .set_guest_debug = svm_guest_debug,
1630 .get_msr = svm_get_msr,
1631 .set_msr = svm_set_msr,
1632 .get_segment_base = svm_get_segment_base,
1633 .get_segment = svm_get_segment,
1634 .set_segment = svm_set_segment,
1635 .is_long_mode = svm_is_long_mode,
1636 .get_cs_db_l_bits = svm_get_cs_db_l_bits,
1637 .set_cr0 = svm_set_cr0,
1638 .set_cr0_no_modeswitch = svm_set_cr0,
1639 .set_cr3 = svm_set_cr3,
1640 .set_cr4 = svm_set_cr4,
1641 .set_efer = svm_set_efer,
1642 .get_idt = svm_get_idt,
1643 .set_idt = svm_set_idt,
1644 .get_gdt = svm_get_gdt,
1645 .set_gdt = svm_set_gdt,
1646 .get_dr = svm_get_dr,
1647 .set_dr = svm_set_dr,
1648 .cache_regs = svm_cache_regs,
1649 .decache_regs = svm_decache_regs,
1650 .get_rflags = svm_get_rflags,
1651 .set_rflags = svm_set_rflags,
1652
1653 .invlpg = svm_invlpg,
1654 .tlb_flush = svm_flush_tlb,
1655 .inject_page_fault = svm_inject_page_fault,
1656
1657 .inject_gp = svm_inject_gp,
1658
1659 .run = svm_vcpu_run,
1660 .skip_emulated_instruction = skip_emulated_instruction,
1661 .vcpu_setup = svm_vcpu_setup,
1662};
1663
1664static int __init svm_init(void)
1665{
1666 kvm_emulator_want_group7_invlpg();
1667 kvm_init_arch(&svm_arch_ops, THIS_MODULE);
1668 return 0;
1669}
1670
1671static void __exit svm_exit(void)
1672{
1673 kvm_exit_arch();
1674}
1675
1676module_init(svm_init)
1677module_exit(svm_exit)
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-02 12:24:01 -0400