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5
6
7#include <linux/cpu.h>
8#include <linux/kvm.h>
9#include <linux/kvm_host.h>
10#include <linux/perf_event.h>
11#include <linux/perf/arm_pmu.h>
12#include <linux/uaccess.h>
13#include <asm/kvm_emulate.h>
14#include <kvm/arm_pmu.h>
15#include <kvm/arm_vgic.h>
16
17static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx);
18static void kvm_pmu_update_pmc_chained(struct kvm_vcpu *vcpu, u64 select_idx);
19static void kvm_pmu_stop_counter(struct kvm_vcpu *vcpu, struct kvm_pmc *pmc);
20
21#define PERF_ATTR_CFG1_KVM_PMU_CHAINED 0x1
22
23static u32 kvm_pmu_event_mask(struct kvm *kvm)
24{
25 switch (kvm->arch.pmuver) {
26 case ID_AA64DFR0_PMUVER_8_0:
27 return GENMASK(9, 0);
28 case ID_AA64DFR0_PMUVER_8_1:
29 case ID_AA64DFR0_PMUVER_8_4:
30 case ID_AA64DFR0_PMUVER_8_5:
31 return GENMASK(15, 0);
32 default:
33 WARN_ONCE(1, "Unknown PMU version %d\n", kvm->arch.pmuver);
34 return 0;
35 }
36}
37
38
39
40
41
42
43static bool kvm_pmu_idx_is_64bit(struct kvm_vcpu *vcpu, u64 select_idx)
44{
45 return (select_idx == ARMV8_PMU_CYCLE_IDX &&
46 __vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_LC);
47}
48
49static struct kvm_vcpu *kvm_pmc_to_vcpu(struct kvm_pmc *pmc)
50{
51 struct kvm_pmu *pmu;
52 struct kvm_vcpu_arch *vcpu_arch;
53
54 pmc -= pmc->idx;
55 pmu = container_of(pmc, struct kvm_pmu, pmc[0]);
56 vcpu_arch = container_of(pmu, struct kvm_vcpu_arch, pmu);
57 return container_of(vcpu_arch, struct kvm_vcpu, arch);
58}
59
60
61
62
63
64static bool kvm_pmu_pmc_is_chained(struct kvm_pmc *pmc)
65{
66 struct kvm_vcpu *vcpu = kvm_pmc_to_vcpu(pmc);
67
68 return test_bit(pmc->idx >> 1, vcpu->arch.pmu.chained);
69}
70
71
72
73
74
75static bool kvm_pmu_idx_is_high_counter(u64 select_idx)
76{
77 return select_idx & 0x1;
78}
79
80
81
82
83
84
85
86
87static struct kvm_pmc *kvm_pmu_get_canonical_pmc(struct kvm_pmc *pmc)
88{
89 if (kvm_pmu_pmc_is_chained(pmc) &&
90 kvm_pmu_idx_is_high_counter(pmc->idx))
91 return pmc - 1;
92
93 return pmc;
94}
95static struct kvm_pmc *kvm_pmu_get_alternate_pmc(struct kvm_pmc *pmc)
96{
97 if (kvm_pmu_idx_is_high_counter(pmc->idx))
98 return pmc - 1;
99 else
100 return pmc + 1;
101}
102
103
104
105
106
107
108static bool kvm_pmu_idx_has_chain_evtype(struct kvm_vcpu *vcpu, u64 select_idx)
109{
110 u64 eventsel, reg;
111
112 select_idx |= 0x1;
113
114 if (select_idx == ARMV8_PMU_CYCLE_IDX)
115 return false;
116
117 reg = PMEVTYPER0_EL0 + select_idx;
118 eventsel = __vcpu_sys_reg(vcpu, reg) & kvm_pmu_event_mask(vcpu->kvm);
119
120 return eventsel == ARMV8_PMUV3_PERFCTR_CHAIN;
121}
122
123
124
125
126
127
128static u64 kvm_pmu_get_pair_counter_value(struct kvm_vcpu *vcpu,
129 struct kvm_pmc *pmc)
130{
131 u64 counter, counter_high, reg, enabled, running;
132
133 if (kvm_pmu_pmc_is_chained(pmc)) {
134 pmc = kvm_pmu_get_canonical_pmc(pmc);
135 reg = PMEVCNTR0_EL0 + pmc->idx;
136
137 counter = __vcpu_sys_reg(vcpu, reg);
138 counter_high = __vcpu_sys_reg(vcpu, reg + 1);
139
140 counter = lower_32_bits(counter) | (counter_high << 32);
141 } else {
142 reg = (pmc->idx == ARMV8_PMU_CYCLE_IDX)
143 ? PMCCNTR_EL0 : PMEVCNTR0_EL0 + pmc->idx;
144 counter = __vcpu_sys_reg(vcpu, reg);
145 }
146
147
148
149
150
151 if (pmc->perf_event)
152 counter += perf_event_read_value(pmc->perf_event, &enabled,
153 &running);
154
155 return counter;
156}
157
158
159
160
161
162
163u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu, u64 select_idx)
164{
165 u64 counter;
166 struct kvm_pmu *pmu = &vcpu->arch.pmu;
167 struct kvm_pmc *pmc = &pmu->pmc[select_idx];
168
169 counter = kvm_pmu_get_pair_counter_value(vcpu, pmc);
170
171 if (kvm_pmu_pmc_is_chained(pmc) &&
172 kvm_pmu_idx_is_high_counter(select_idx))
173 counter = upper_32_bits(counter);
174 else if (select_idx != ARMV8_PMU_CYCLE_IDX)
175 counter = lower_32_bits(counter);
176
177 return counter;
178}
179
180
181
182
183
184
185
186void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu, u64 select_idx, u64 val)
187{
188 u64 reg;
189
190 reg = (select_idx == ARMV8_PMU_CYCLE_IDX)
191 ? PMCCNTR_EL0 : PMEVCNTR0_EL0 + select_idx;
192 __vcpu_sys_reg(vcpu, reg) += (s64)val - kvm_pmu_get_counter_value(vcpu, select_idx);
193
194
195 kvm_pmu_create_perf_event(vcpu, select_idx);
196}
197
198
199
200
201
202static void kvm_pmu_release_perf_event(struct kvm_pmc *pmc)
203{
204 pmc = kvm_pmu_get_canonical_pmc(pmc);
205 if (pmc->perf_event) {
206 perf_event_disable(pmc->perf_event);
207 perf_event_release_kernel(pmc->perf_event);
208 pmc->perf_event = NULL;
209 }
210}
211
212
213
214
215
216
217
218static void kvm_pmu_stop_counter(struct kvm_vcpu *vcpu, struct kvm_pmc *pmc)
219{
220 u64 counter, reg, val;
221
222 pmc = kvm_pmu_get_canonical_pmc(pmc);
223 if (!pmc->perf_event)
224 return;
225
226 counter = kvm_pmu_get_pair_counter_value(vcpu, pmc);
227
228 if (pmc->idx == ARMV8_PMU_CYCLE_IDX) {
229 reg = PMCCNTR_EL0;
230 val = counter;
231 } else {
232 reg = PMEVCNTR0_EL0 + pmc->idx;
233 val = lower_32_bits(counter);
234 }
235
236 __vcpu_sys_reg(vcpu, reg) = val;
237
238 if (kvm_pmu_pmc_is_chained(pmc))
239 __vcpu_sys_reg(vcpu, reg + 1) = upper_32_bits(counter);
240
241 kvm_pmu_release_perf_event(pmc);
242}
243
244
245
246
247
248
249void kvm_pmu_vcpu_init(struct kvm_vcpu *vcpu)
250{
251 int i;
252 struct kvm_pmu *pmu = &vcpu->arch.pmu;
253
254 for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++)
255 pmu->pmc[i].idx = i;
256}
257
258
259
260
261
262
263void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu)
264{
265 unsigned long mask = kvm_pmu_valid_counter_mask(vcpu);
266 struct kvm_pmu *pmu = &vcpu->arch.pmu;
267 int i;
268
269 for_each_set_bit(i, &mask, 32)
270 kvm_pmu_stop_counter(vcpu, &pmu->pmc[i]);
271
272 bitmap_zero(vcpu->arch.pmu.chained, ARMV8_PMU_MAX_COUNTER_PAIRS);
273}
274
275
276
277
278
279
280void kvm_pmu_vcpu_destroy(struct kvm_vcpu *vcpu)
281{
282 int i;
283 struct kvm_pmu *pmu = &vcpu->arch.pmu;
284
285 for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++)
286 kvm_pmu_release_perf_event(&pmu->pmc[i]);
287 irq_work_sync(&vcpu->arch.pmu.overflow_work);
288}
289
290u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu)
291{
292 u64 val = __vcpu_sys_reg(vcpu, PMCR_EL0) >> ARMV8_PMU_PMCR_N_SHIFT;
293
294 val &= ARMV8_PMU_PMCR_N_MASK;
295 if (val == 0)
296 return BIT(ARMV8_PMU_CYCLE_IDX);
297 else
298 return GENMASK(val - 1, 0) | BIT(ARMV8_PMU_CYCLE_IDX);
299}
300
301
302
303
304
305
306
307
308void kvm_pmu_enable_counter_mask(struct kvm_vcpu *vcpu, u64 val)
309{
310 int i;
311 struct kvm_pmu *pmu = &vcpu->arch.pmu;
312 struct kvm_pmc *pmc;
313
314 if (!(__vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E) || !val)
315 return;
316
317 for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++) {
318 if (!(val & BIT(i)))
319 continue;
320
321 pmc = &pmu->pmc[i];
322
323
324 kvm_pmu_update_pmc_chained(vcpu, i);
325 kvm_pmu_create_perf_event(vcpu, i);
326
327
328 if (pmc->perf_event) {
329 perf_event_enable(pmc->perf_event);
330 if (pmc->perf_event->state != PERF_EVENT_STATE_ACTIVE)
331 kvm_debug("fail to enable perf event\n");
332 }
333 }
334}
335
336
337
338
339
340
341
342
343void kvm_pmu_disable_counter_mask(struct kvm_vcpu *vcpu, u64 val)
344{
345 int i;
346 struct kvm_pmu *pmu = &vcpu->arch.pmu;
347 struct kvm_pmc *pmc;
348
349 if (!val)
350 return;
351
352 for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++) {
353 if (!(val & BIT(i)))
354 continue;
355
356 pmc = &pmu->pmc[i];
357
358
359 kvm_pmu_update_pmc_chained(vcpu, i);
360 kvm_pmu_create_perf_event(vcpu, i);
361
362
363 if (pmc->perf_event)
364 perf_event_disable(pmc->perf_event);
365 }
366}
367
368static u64 kvm_pmu_overflow_status(struct kvm_vcpu *vcpu)
369{
370 u64 reg = 0;
371
372 if ((__vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E)) {
373 reg = __vcpu_sys_reg(vcpu, PMOVSSET_EL0);
374 reg &= __vcpu_sys_reg(vcpu, PMCNTENSET_EL0);
375 reg &= __vcpu_sys_reg(vcpu, PMINTENSET_EL1);
376 }
377
378 return reg;
379}
380
381static void kvm_pmu_update_state(struct kvm_vcpu *vcpu)
382{
383 struct kvm_pmu *pmu = &vcpu->arch.pmu;
384 bool overflow;
385
386 if (!kvm_vcpu_has_pmu(vcpu))
387 return;
388
389 overflow = !!kvm_pmu_overflow_status(vcpu);
390 if (pmu->irq_level == overflow)
391 return;
392
393 pmu->irq_level = overflow;
394
395 if (likely(irqchip_in_kernel(vcpu->kvm))) {
396 int ret = kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id,
397 pmu->irq_num, overflow, pmu);
398 WARN_ON(ret);
399 }
400}
401
402bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu)
403{
404 struct kvm_pmu *pmu = &vcpu->arch.pmu;
405 struct kvm_sync_regs *sregs = &vcpu->run->s.regs;
406 bool run_level = sregs->device_irq_level & KVM_ARM_DEV_PMU;
407
408 if (likely(irqchip_in_kernel(vcpu->kvm)))
409 return false;
410
411 return pmu->irq_level != run_level;
412}
413
414
415
416
417void kvm_pmu_update_run(struct kvm_vcpu *vcpu)
418{
419 struct kvm_sync_regs *regs = &vcpu->run->s.regs;
420
421
422 regs->device_irq_level &= ~KVM_ARM_DEV_PMU;
423 if (vcpu->arch.pmu.irq_level)
424 regs->device_irq_level |= KVM_ARM_DEV_PMU;
425}
426
427
428
429
430
431
432
433
434void kvm_pmu_flush_hwstate(struct kvm_vcpu *vcpu)
435{
436 kvm_pmu_update_state(vcpu);
437}
438
439
440
441
442
443
444
445
446void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu)
447{
448 kvm_pmu_update_state(vcpu);
449}
450
451
452
453
454
455
456static void kvm_pmu_perf_overflow_notify_vcpu(struct irq_work *work)
457{
458 struct kvm_vcpu *vcpu;
459 struct kvm_pmu *pmu;
460
461 pmu = container_of(work, struct kvm_pmu, overflow_work);
462 vcpu = kvm_pmc_to_vcpu(pmu->pmc);
463
464 kvm_vcpu_kick(vcpu);
465}
466
467
468
469
470static void kvm_pmu_perf_overflow(struct perf_event *perf_event,
471 struct perf_sample_data *data,
472 struct pt_regs *regs)
473{
474 struct kvm_pmc *pmc = perf_event->overflow_handler_context;
475 struct arm_pmu *cpu_pmu = to_arm_pmu(perf_event->pmu);
476 struct kvm_vcpu *vcpu = kvm_pmc_to_vcpu(pmc);
477 int idx = pmc->idx;
478 u64 period;
479
480 cpu_pmu->pmu.stop(perf_event, PERF_EF_UPDATE);
481
482
483
484
485
486 period = -(local64_read(&perf_event->count));
487
488 if (!kvm_pmu_idx_is_64bit(vcpu, pmc->idx))
489 period &= GENMASK(31, 0);
490
491 local64_set(&perf_event->hw.period_left, 0);
492 perf_event->attr.sample_period = period;
493 perf_event->hw.sample_period = period;
494
495 __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= BIT(idx);
496
497 if (kvm_pmu_overflow_status(vcpu)) {
498 kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
499
500 if (!in_nmi())
501 kvm_vcpu_kick(vcpu);
502 else
503 irq_work_queue(&vcpu->arch.pmu.overflow_work);
504 }
505
506 cpu_pmu->pmu.start(perf_event, PERF_EF_RELOAD);
507}
508
509
510
511
512
513
514void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val)
515{
516 struct kvm_pmu *pmu = &vcpu->arch.pmu;
517 int i;
518
519 if (!(__vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E))
520 return;
521
522
523 val &= __vcpu_sys_reg(vcpu, PMCNTENSET_EL0);
524
525 for (i = 0; i < ARMV8_PMU_CYCLE_IDX; i++) {
526 u64 type, reg;
527
528 if (!(val & BIT(i)))
529 continue;
530
531
532 type = __vcpu_sys_reg(vcpu, PMEVTYPER0_EL0 + i);
533 type &= kvm_pmu_event_mask(vcpu->kvm);
534 if (type != ARMV8_PMUV3_PERFCTR_SW_INCR)
535 continue;
536
537
538 reg = __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) + 1;
539 reg = lower_32_bits(reg);
540 __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) = reg;
541
542 if (reg)
543 continue;
544
545 if (kvm_pmu_pmc_is_chained(&pmu->pmc[i])) {
546
547 reg = __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i + 1) + 1;
548 reg = lower_32_bits(reg);
549 __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i + 1) = reg;
550 if (!reg)
551 __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= BIT(i + 1);
552 } else {
553
554 __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= BIT(i);
555 }
556 }
557}
558
559
560
561
562
563
564void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val)
565{
566 int i;
567
568 if (val & ARMV8_PMU_PMCR_E) {
569 kvm_pmu_enable_counter_mask(vcpu,
570 __vcpu_sys_reg(vcpu, PMCNTENSET_EL0));
571 } else {
572 kvm_pmu_disable_counter_mask(vcpu,
573 __vcpu_sys_reg(vcpu, PMCNTENSET_EL0));
574 }
575
576 if (val & ARMV8_PMU_PMCR_C)
577 kvm_pmu_set_counter_value(vcpu, ARMV8_PMU_CYCLE_IDX, 0);
578
579 if (val & ARMV8_PMU_PMCR_P) {
580 unsigned long mask = kvm_pmu_valid_counter_mask(vcpu);
581 mask &= ~BIT(ARMV8_PMU_CYCLE_IDX);
582 for_each_set_bit(i, &mask, 32)
583 kvm_pmu_set_counter_value(vcpu, i, 0);
584 }
585}
586
587static bool kvm_pmu_counter_is_enabled(struct kvm_vcpu *vcpu, u64 select_idx)
588{
589 return (__vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E) &&
590 (__vcpu_sys_reg(vcpu, PMCNTENSET_EL0) & BIT(select_idx));
591}
592
593
594
595
596
597
598static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx)
599{
600 struct kvm_pmu *pmu = &vcpu->arch.pmu;
601 struct kvm_pmc *pmc;
602 struct perf_event *event;
603 struct perf_event_attr attr;
604 u64 eventsel, counter, reg, data;
605
606
607
608
609
610
611 pmc = kvm_pmu_get_canonical_pmc(&pmu->pmc[select_idx]);
612
613 reg = (pmc->idx == ARMV8_PMU_CYCLE_IDX)
614 ? PMCCFILTR_EL0 : PMEVTYPER0_EL0 + pmc->idx;
615 data = __vcpu_sys_reg(vcpu, reg);
616
617 kvm_pmu_stop_counter(vcpu, pmc);
618 if (pmc->idx == ARMV8_PMU_CYCLE_IDX)
619 eventsel = ARMV8_PMUV3_PERFCTR_CPU_CYCLES;
620 else
621 eventsel = data & kvm_pmu_event_mask(vcpu->kvm);
622
623
624 if (eventsel == ARMV8_PMUV3_PERFCTR_SW_INCR)
625 return;
626
627
628
629
630
631 if (vcpu->kvm->arch.pmu_filter &&
632 !test_bit(eventsel, vcpu->kvm->arch.pmu_filter))
633 return;
634
635 memset(&attr, 0, sizeof(struct perf_event_attr));
636 attr.type = PERF_TYPE_RAW;
637 attr.size = sizeof(attr);
638 attr.pinned = 1;
639 attr.disabled = !kvm_pmu_counter_is_enabled(vcpu, pmc->idx);
640 attr.exclude_user = data & ARMV8_PMU_EXCLUDE_EL0 ? 1 : 0;
641 attr.exclude_kernel = data & ARMV8_PMU_EXCLUDE_EL1 ? 1 : 0;
642 attr.exclude_hv = 1;
643 attr.exclude_host = 1;
644 attr.config = eventsel;
645
646 counter = kvm_pmu_get_pair_counter_value(vcpu, pmc);
647
648 if (kvm_pmu_pmc_is_chained(pmc)) {
649
650
651
652
653
654 attr.sample_period = (-counter) & GENMASK(63, 0);
655 attr.config1 |= PERF_ATTR_CFG1_KVM_PMU_CHAINED;
656
657 event = perf_event_create_kernel_counter(&attr, -1, current,
658 kvm_pmu_perf_overflow,
659 pmc + 1);
660 } else {
661
662 if (kvm_pmu_idx_is_64bit(vcpu, pmc->idx))
663 attr.sample_period = (-counter) & GENMASK(63, 0);
664 else
665 attr.sample_period = (-counter) & GENMASK(31, 0);
666
667 event = perf_event_create_kernel_counter(&attr, -1, current,
668 kvm_pmu_perf_overflow, pmc);
669 }
670
671 if (IS_ERR(event)) {
672 pr_err_once("kvm: pmu event creation failed %ld\n",
673 PTR_ERR(event));
674 return;
675 }
676
677 pmc->perf_event = event;
678}
679
680
681
682
683
684
685
686
687
688static void kvm_pmu_update_pmc_chained(struct kvm_vcpu *vcpu, u64 select_idx)
689{
690 struct kvm_pmu *pmu = &vcpu->arch.pmu;
691 struct kvm_pmc *pmc = &pmu->pmc[select_idx], *canonical_pmc;
692 bool new_state, old_state;
693
694 old_state = kvm_pmu_pmc_is_chained(pmc);
695 new_state = kvm_pmu_idx_has_chain_evtype(vcpu, pmc->idx) &&
696 kvm_pmu_counter_is_enabled(vcpu, pmc->idx | 0x1);
697
698 if (old_state == new_state)
699 return;
700
701 canonical_pmc = kvm_pmu_get_canonical_pmc(pmc);
702 kvm_pmu_stop_counter(vcpu, canonical_pmc);
703 if (new_state) {
704
705
706
707
708 kvm_pmu_stop_counter(vcpu, kvm_pmu_get_alternate_pmc(pmc));
709 set_bit(pmc->idx >> 1, vcpu->arch.pmu.chained);
710 return;
711 }
712 clear_bit(pmc->idx >> 1, vcpu->arch.pmu.chained);
713}
714
715
716
717
718
719
720
721
722
723
724
725void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data,
726 u64 select_idx)
727{
728 u64 reg, mask;
729
730 mask = ARMV8_PMU_EVTYPE_MASK;
731 mask &= ~ARMV8_PMU_EVTYPE_EVENT;
732 mask |= kvm_pmu_event_mask(vcpu->kvm);
733
734 reg = (select_idx == ARMV8_PMU_CYCLE_IDX)
735 ? PMCCFILTR_EL0 : PMEVTYPER0_EL0 + select_idx;
736
737 __vcpu_sys_reg(vcpu, reg) = data & mask;
738
739 kvm_pmu_update_pmc_chained(vcpu, select_idx);
740 kvm_pmu_create_perf_event(vcpu, select_idx);
741}
742
743void kvm_host_pmu_init(struct arm_pmu *pmu)
744{
745 if (pmu->pmuver != 0 && pmu->pmuver != ID_AA64DFR0_PMUVER_IMP_DEF &&
746 !kvm_arm_support_pmu_v3() && !is_protected_kvm_enabled())
747 static_branch_enable(&kvm_arm_pmu_available);
748}
749
750static int kvm_pmu_probe_pmuver(void)
751{
752 struct perf_event_attr attr = { };
753 struct perf_event *event;
754 struct arm_pmu *pmu;
755 int pmuver = ID_AA64DFR0_PMUVER_IMP_DEF;
756
757
758
759
760
761
762
763 attr.type = PERF_TYPE_RAW;
764 attr.size = sizeof(attr);
765 attr.pinned = 1;
766 attr.disabled = 0;
767 attr.exclude_user = 0;
768 attr.exclude_kernel = 1;
769 attr.exclude_hv = 1;
770 attr.exclude_host = 1;
771 attr.config = ARMV8_PMUV3_PERFCTR_CPU_CYCLES;
772 attr.sample_period = GENMASK(63, 0);
773
774 event = perf_event_create_kernel_counter(&attr, -1, current,
775 kvm_pmu_perf_overflow, &attr);
776
777 if (IS_ERR(event)) {
778 pr_err_once("kvm: pmu event creation failed %ld\n",
779 PTR_ERR(event));
780 return ID_AA64DFR0_PMUVER_IMP_DEF;
781 }
782
783 if (event->pmu) {
784 pmu = to_arm_pmu(event->pmu);
785 if (pmu->pmuver)
786 pmuver = pmu->pmuver;
787 }
788
789 perf_event_disable(event);
790 perf_event_release_kernel(event);
791
792 return pmuver;
793}
794
795u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1)
796{
797 unsigned long *bmap = vcpu->kvm->arch.pmu_filter;
798 u64 val, mask = 0;
799 int base, i, nr_events;
800
801 if (!pmceid1) {
802 val = read_sysreg(pmceid0_el0);
803 base = 0;
804 } else {
805 val = read_sysreg(pmceid1_el0);
806
807
808
809
810 if (vcpu->kvm->arch.pmuver >= ID_AA64DFR0_PMUVER_8_4)
811 val &= ~BIT_ULL(ARMV8_PMUV3_PERFCTR_STALL_SLOT - 32);
812 base = 32;
813 }
814
815 if (!bmap)
816 return val;
817
818 nr_events = kvm_pmu_event_mask(vcpu->kvm) + 1;
819
820 for (i = 0; i < 32; i += 8) {
821 u64 byte;
822
823 byte = bitmap_get_value8(bmap, base + i);
824 mask |= byte << i;
825 if (nr_events >= (0x4000 + base + 32)) {
826 byte = bitmap_get_value8(bmap, 0x4000 + base + i);
827 mask |= byte << (32 + i);
828 }
829 }
830
831 return val & mask;
832}
833
834int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu)
835{
836 if (!kvm_vcpu_has_pmu(vcpu))
837 return 0;
838
839 if (!vcpu->arch.pmu.created)
840 return -EINVAL;
841
842
843
844
845
846
847 if (irqchip_in_kernel(vcpu->kvm)) {
848 int irq = vcpu->arch.pmu.irq_num;
849
850
851
852
853
854
855 if (!irq_is_ppi(irq) && !vgic_valid_spi(vcpu->kvm, irq))
856 return -EINVAL;
857 } else if (kvm_arm_pmu_irq_initialized(vcpu)) {
858 return -EINVAL;
859 }
860
861
862 kvm_make_request(KVM_REQ_RELOAD_PMU, vcpu);
863
864 return 0;
865}
866
867static int kvm_arm_pmu_v3_init(struct kvm_vcpu *vcpu)
868{
869 if (irqchip_in_kernel(vcpu->kvm)) {
870 int ret;
871
872
873
874
875
876
877 if (!vgic_initialized(vcpu->kvm))
878 return -ENODEV;
879
880 if (!kvm_arm_pmu_irq_initialized(vcpu))
881 return -ENXIO;
882
883 ret = kvm_vgic_set_owner(vcpu, vcpu->arch.pmu.irq_num,
884 &vcpu->arch.pmu);
885 if (ret)
886 return ret;
887 }
888
889 init_irq_work(&vcpu->arch.pmu.overflow_work,
890 kvm_pmu_perf_overflow_notify_vcpu);
891
892 vcpu->arch.pmu.created = true;
893 return 0;
894}
895
896
897
898
899
900
901static bool pmu_irq_is_valid(struct kvm *kvm, int irq)
902{
903 int i;
904 struct kvm_vcpu *vcpu;
905
906 kvm_for_each_vcpu(i, vcpu, kvm) {
907 if (!kvm_arm_pmu_irq_initialized(vcpu))
908 continue;
909
910 if (irq_is_ppi(irq)) {
911 if (vcpu->arch.pmu.irq_num != irq)
912 return false;
913 } else {
914 if (vcpu->arch.pmu.irq_num == irq)
915 return false;
916 }
917 }
918
919 return true;
920}
921
922int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
923{
924 if (!kvm_vcpu_has_pmu(vcpu))
925 return -ENODEV;
926
927 if (vcpu->arch.pmu.created)
928 return -EBUSY;
929
930 if (!vcpu->kvm->arch.pmuver)
931 vcpu->kvm->arch.pmuver = kvm_pmu_probe_pmuver();
932
933 if (vcpu->kvm->arch.pmuver == ID_AA64DFR0_PMUVER_IMP_DEF)
934 return -ENODEV;
935
936 switch (attr->attr) {
937 case KVM_ARM_VCPU_PMU_V3_IRQ: {
938 int __user *uaddr = (int __user *)(long)attr->addr;
939 int irq;
940
941 if (!irqchip_in_kernel(vcpu->kvm))
942 return -EINVAL;
943
944 if (get_user(irq, uaddr))
945 return -EFAULT;
946
947
948 if (!(irq_is_ppi(irq) || irq_is_spi(irq)))
949 return -EINVAL;
950
951 if (!pmu_irq_is_valid(vcpu->kvm, irq))
952 return -EINVAL;
953
954 if (kvm_arm_pmu_irq_initialized(vcpu))
955 return -EBUSY;
956
957 kvm_debug("Set kvm ARM PMU irq: %d\n", irq);
958 vcpu->arch.pmu.irq_num = irq;
959 return 0;
960 }
961 case KVM_ARM_VCPU_PMU_V3_FILTER: {
962 struct kvm_pmu_event_filter __user *uaddr;
963 struct kvm_pmu_event_filter filter;
964 int nr_events;
965
966 nr_events = kvm_pmu_event_mask(vcpu->kvm) + 1;
967
968 uaddr = (struct kvm_pmu_event_filter __user *)(long)attr->addr;
969
970 if (copy_from_user(&filter, uaddr, sizeof(filter)))
971 return -EFAULT;
972
973 if (((u32)filter.base_event + filter.nevents) > nr_events ||
974 (filter.action != KVM_PMU_EVENT_ALLOW &&
975 filter.action != KVM_PMU_EVENT_DENY))
976 return -EINVAL;
977
978 mutex_lock(&vcpu->kvm->lock);
979
980 if (!vcpu->kvm->arch.pmu_filter) {
981 vcpu->kvm->arch.pmu_filter = bitmap_alloc(nr_events, GFP_KERNEL);
982 if (!vcpu->kvm->arch.pmu_filter) {
983 mutex_unlock(&vcpu->kvm->lock);
984 return -ENOMEM;
985 }
986
987
988
989
990
991
992
993 if (filter.action == KVM_PMU_EVENT_ALLOW)
994 bitmap_zero(vcpu->kvm->arch.pmu_filter, nr_events);
995 else
996 bitmap_fill(vcpu->kvm->arch.pmu_filter, nr_events);
997 }
998
999 if (filter.action == KVM_PMU_EVENT_ALLOW)
1000 bitmap_set(vcpu->kvm->arch.pmu_filter, filter.base_event, filter.nevents);
1001 else
1002 bitmap_clear(vcpu->kvm->arch.pmu_filter, filter.base_event, filter.nevents);
1003
1004 mutex_unlock(&vcpu->kvm->lock);
1005
1006 return 0;
1007 }
1008 case KVM_ARM_VCPU_PMU_V3_INIT:
1009 return kvm_arm_pmu_v3_init(vcpu);
1010 }
1011
1012 return -ENXIO;
1013}
1014
1015int kvm_arm_pmu_v3_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
1016{
1017 switch (attr->attr) {
1018 case KVM_ARM_VCPU_PMU_V3_IRQ: {
1019 int __user *uaddr = (int __user *)(long)attr->addr;
1020 int irq;
1021
1022 if (!irqchip_in_kernel(vcpu->kvm))
1023 return -EINVAL;
1024
1025 if (!kvm_vcpu_has_pmu(vcpu))
1026 return -ENODEV;
1027
1028 if (!kvm_arm_pmu_irq_initialized(vcpu))
1029 return -ENXIO;
1030
1031 irq = vcpu->arch.pmu.irq_num;
1032 return put_user(irq, uaddr);
1033 }
1034 }
1035
1036 return -ENXIO;
1037}
1038
1039int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
1040{
1041 switch (attr->attr) {
1042 case KVM_ARM_VCPU_PMU_V3_IRQ:
1043 case KVM_ARM_VCPU_PMU_V3_INIT:
1044 case KVM_ARM_VCPU_PMU_V3_FILTER:
1045 if (kvm_vcpu_has_pmu(vcpu))
1046 return 0;
1047 }
1048
1049 return -ENXIO;
1050}
1051