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1 | /* |
2 | * Kernel-based Virtual Machine -- Performane Monitoring Unit support | |
3 | * | |
4 | * Copyright 2011 Red Hat, Inc. and/or its affiliates. | |
5 | * | |
6 | * Authors: | |
7 | * Avi Kivity <avi@redhat.com> | |
8 | * Gleb Natapov <gleb@redhat.com> | |
9 | * | |
10 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
11 | * the COPYING file in the top-level directory. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/types.h> | |
16 | #include <linux/kvm_host.h> | |
17 | #include <linux/perf_event.h> | |
18 | #include "x86.h" | |
19 | #include "cpuid.h" | |
20 | #include "lapic.h" | |
21 | ||
22 | static struct kvm_arch_event_perf_mapping { | |
23 | u8 eventsel; | |
24 | u8 unit_mask; | |
25 | unsigned event_type; | |
26 | bool inexact; | |
27 | } arch_events[] = { | |
28 | /* Index must match CPUID 0x0A.EBX bit vector */ | |
29 | [0] = { 0x3c, 0x00, PERF_COUNT_HW_CPU_CYCLES }, | |
30 | [1] = { 0xc0, 0x00, PERF_COUNT_HW_INSTRUCTIONS }, | |
31 | [2] = { 0x3c, 0x01, PERF_COUNT_HW_BUS_CYCLES }, | |
32 | [3] = { 0x2e, 0x4f, PERF_COUNT_HW_CACHE_REFERENCES }, | |
33 | [4] = { 0x2e, 0x41, PERF_COUNT_HW_CACHE_MISSES }, | |
34 | [5] = { 0xc4, 0x00, PERF_COUNT_HW_BRANCH_INSTRUCTIONS }, | |
35 | [6] = { 0xc5, 0x00, PERF_COUNT_HW_BRANCH_MISSES }, | |
36 | }; | |
37 | ||
38 | /* mapping between fixed pmc index and arch_events array */ | |
39 | int fixed_pmc_events[] = {1, 0, 2}; | |
40 | ||
41 | static bool pmc_is_gp(struct kvm_pmc *pmc) | |
42 | { | |
43 | return pmc->type == KVM_PMC_GP; | |
44 | } | |
45 | ||
46 | static inline u64 pmc_bitmask(struct kvm_pmc *pmc) | |
47 | { | |
48 | struct kvm_pmu *pmu = &pmc->vcpu->arch.pmu; | |
49 | ||
50 | return pmu->counter_bitmask[pmc->type]; | |
51 | } | |
52 | ||
53 | static inline bool pmc_enabled(struct kvm_pmc *pmc) | |
54 | { | |
55 | struct kvm_pmu *pmu = &pmc->vcpu->arch.pmu; | |
56 | return test_bit(pmc->idx, (unsigned long *)&pmu->global_ctrl); | |
57 | } | |
58 | ||
59 | static inline struct kvm_pmc *get_gp_pmc(struct kvm_pmu *pmu, u32 msr, | |
60 | u32 base) | |
61 | { | |
62 | if (msr >= base && msr < base + pmu->nr_arch_gp_counters) | |
63 | return &pmu->gp_counters[msr - base]; | |
64 | return NULL; | |
65 | } | |
66 | ||
67 | static inline struct kvm_pmc *get_fixed_pmc(struct kvm_pmu *pmu, u32 msr) | |
68 | { | |
69 | int base = MSR_CORE_PERF_FIXED_CTR0; | |
70 | if (msr >= base && msr < base + pmu->nr_arch_fixed_counters) | |
71 | return &pmu->fixed_counters[msr - base]; | |
72 | return NULL; | |
73 | } | |
74 | ||
75 | static inline struct kvm_pmc *get_fixed_pmc_idx(struct kvm_pmu *pmu, int idx) | |
76 | { | |
77 | return get_fixed_pmc(pmu, MSR_CORE_PERF_FIXED_CTR0 + idx); | |
78 | } | |
79 | ||
80 | static struct kvm_pmc *global_idx_to_pmc(struct kvm_pmu *pmu, int idx) | |
81 | { | |
82 | if (idx < X86_PMC_IDX_FIXED) | |
83 | return get_gp_pmc(pmu, MSR_P6_EVNTSEL0 + idx, MSR_P6_EVNTSEL0); | |
84 | else | |
85 | return get_fixed_pmc_idx(pmu, idx - X86_PMC_IDX_FIXED); | |
86 | } | |
87 | ||
88 | void kvm_deliver_pmi(struct kvm_vcpu *vcpu) | |
89 | { | |
90 | if (vcpu->arch.apic) | |
91 | kvm_apic_local_deliver(vcpu->arch.apic, APIC_LVTPC); | |
92 | } | |
93 | ||
94 | static void trigger_pmi(struct irq_work *irq_work) | |
95 | { | |
96 | struct kvm_pmu *pmu = container_of(irq_work, struct kvm_pmu, | |
97 | irq_work); | |
98 | struct kvm_vcpu *vcpu = container_of(pmu, struct kvm_vcpu, | |
99 | arch.pmu); | |
100 | ||
101 | kvm_deliver_pmi(vcpu); | |
102 | } | |
103 | ||
104 | static void kvm_perf_overflow(struct perf_event *perf_event, | |
105 | struct perf_sample_data *data, | |
106 | struct pt_regs *regs) | |
107 | { | |
108 | struct kvm_pmc *pmc = perf_event->overflow_handler_context; | |
109 | struct kvm_pmu *pmu = &pmc->vcpu->arch.pmu; | |
110 | __set_bit(pmc->idx, (unsigned long *)&pmu->global_status); | |
111 | } | |
112 | ||
113 | static void kvm_perf_overflow_intr(struct perf_event *perf_event, | |
114 | struct perf_sample_data *data, struct pt_regs *regs) | |
115 | { | |
116 | struct kvm_pmc *pmc = perf_event->overflow_handler_context; | |
117 | struct kvm_pmu *pmu = &pmc->vcpu->arch.pmu; | |
118 | if (!test_and_set_bit(pmc->idx, (unsigned long *)&pmu->reprogram_pmi)) { | |
119 | kvm_perf_overflow(perf_event, data, regs); | |
120 | kvm_make_request(KVM_REQ_PMU, pmc->vcpu); | |
121 | /* | |
122 | * Inject PMI. If vcpu was in a guest mode during NMI PMI | |
123 | * can be ejected on a guest mode re-entry. Otherwise we can't | |
124 | * be sure that vcpu wasn't executing hlt instruction at the | |
125 | * time of vmexit and is not going to re-enter guest mode until, | |
126 | * woken up. So we should wake it, but this is impossible from | |
127 | * NMI context. Do it from irq work instead. | |
128 | */ | |
129 | if (!kvm_is_in_guest()) | |
130 | irq_work_queue(&pmc->vcpu->arch.pmu.irq_work); | |
131 | else | |
132 | kvm_make_request(KVM_REQ_PMI, pmc->vcpu); | |
133 | } | |
134 | } | |
135 | ||
136 | static u64 read_pmc(struct kvm_pmc *pmc) | |
137 | { | |
138 | u64 counter, enabled, running; | |
139 | ||
140 | counter = pmc->counter; | |
141 | ||
142 | if (pmc->perf_event) | |
143 | counter += perf_event_read_value(pmc->perf_event, | |
144 | &enabled, &running); | |
145 | ||
146 | /* FIXME: Scaling needed? */ | |
147 | ||
148 | return counter & pmc_bitmask(pmc); | |
149 | } | |
150 | ||
151 | static void stop_counter(struct kvm_pmc *pmc) | |
152 | { | |
153 | if (pmc->perf_event) { | |
154 | pmc->counter = read_pmc(pmc); | |
155 | perf_event_release_kernel(pmc->perf_event); | |
156 | pmc->perf_event = NULL; | |
157 | } | |
158 | } | |
159 | ||
160 | static void reprogram_counter(struct kvm_pmc *pmc, u32 type, | |
161 | unsigned config, bool exclude_user, bool exclude_kernel, | |
162 | bool intr) | |
163 | { | |
164 | struct perf_event *event; | |
165 | struct perf_event_attr attr = { | |
166 | .type = type, | |
167 | .size = sizeof(attr), | |
168 | .pinned = true, | |
169 | .exclude_idle = true, | |
170 | .exclude_host = 1, | |
171 | .exclude_user = exclude_user, | |
172 | .exclude_kernel = exclude_kernel, | |
173 | .config = config, | |
174 | }; | |
175 | ||
176 | attr.sample_period = (-pmc->counter) & pmc_bitmask(pmc); | |
177 | ||
178 | event = perf_event_create_kernel_counter(&attr, -1, current, | |
179 | intr ? kvm_perf_overflow_intr : | |
180 | kvm_perf_overflow, pmc); | |
181 | if (IS_ERR(event)) { | |
182 | printk_once("kvm: pmu event creation failed %ld\n", | |
183 | PTR_ERR(event)); | |
184 | return; | |
185 | } | |
186 | ||
187 | pmc->perf_event = event; | |
188 | clear_bit(pmc->idx, (unsigned long*)&pmc->vcpu->arch.pmu.reprogram_pmi); | |
189 | } | |
190 | ||
191 | static unsigned find_arch_event(struct kvm_pmu *pmu, u8 event_select, | |
192 | u8 unit_mask) | |
193 | { | |
194 | int i; | |
195 | ||
196 | for (i = 0; i < ARRAY_SIZE(arch_events); i++) | |
197 | if (arch_events[i].eventsel == event_select | |
198 | && arch_events[i].unit_mask == unit_mask | |
199 | && (pmu->available_event_types & (1 << i))) | |
200 | break; | |
201 | ||
202 | if (i == ARRAY_SIZE(arch_events)) | |
203 | return PERF_COUNT_HW_MAX; | |
204 | ||
205 | return arch_events[i].event_type; | |
206 | } | |
207 | ||
208 | static void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel) | |
209 | { | |
210 | unsigned config, type = PERF_TYPE_RAW; | |
211 | u8 event_select, unit_mask; | |
212 | ||
213 | pmc->eventsel = eventsel; | |
214 | ||
215 | stop_counter(pmc); | |
216 | ||
217 | if (!(eventsel & ARCH_PERFMON_EVENTSEL_ENABLE) || !pmc_enabled(pmc)) | |
218 | return; | |
219 | ||
220 | event_select = eventsel & ARCH_PERFMON_EVENTSEL_EVENT; | |
221 | unit_mask = (eventsel & ARCH_PERFMON_EVENTSEL_UMASK) >> 8; | |
222 | ||
223 | if (!(event_select & (ARCH_PERFMON_EVENTSEL_EDGE | | |
224 | ARCH_PERFMON_EVENTSEL_INV | | |
225 | ARCH_PERFMON_EVENTSEL_CMASK))) { | |
226 | config = find_arch_event(&pmc->vcpu->arch.pmu, event_select, | |
227 | unit_mask); | |
228 | if (config != PERF_COUNT_HW_MAX) | |
229 | type = PERF_TYPE_HARDWARE; | |
230 | } | |
231 | ||
232 | if (type == PERF_TYPE_RAW) | |
233 | config = eventsel & X86_RAW_EVENT_MASK; | |
234 | ||
235 | reprogram_counter(pmc, type, config, | |
236 | !(eventsel & ARCH_PERFMON_EVENTSEL_USR), | |
237 | !(eventsel & ARCH_PERFMON_EVENTSEL_OS), | |
238 | eventsel & ARCH_PERFMON_EVENTSEL_INT); | |
239 | } | |
240 | ||
241 | static void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 en_pmi, int idx) | |
242 | { | |
243 | unsigned en = en_pmi & 0x3; | |
244 | bool pmi = en_pmi & 0x8; | |
245 | ||
246 | stop_counter(pmc); | |
247 | ||
248 | if (!en || !pmc_enabled(pmc)) | |
249 | return; | |
250 | ||
251 | reprogram_counter(pmc, PERF_TYPE_HARDWARE, | |
252 | arch_events[fixed_pmc_events[idx]].event_type, | |
253 | !(en & 0x2), /* exclude user */ | |
254 | !(en & 0x1), /* exclude kernel */ | |
255 | pmi); | |
256 | } | |
257 | ||
258 | static inline u8 fixed_en_pmi(u64 ctrl, int idx) | |
259 | { | |
260 | return (ctrl >> (idx * 4)) & 0xf; | |
261 | } | |
262 | ||
263 | static void reprogram_fixed_counters(struct kvm_pmu *pmu, u64 data) | |
264 | { | |
265 | int i; | |
266 | ||
267 | for (i = 0; i < pmu->nr_arch_fixed_counters; i++) { | |
268 | u8 en_pmi = fixed_en_pmi(data, i); | |
269 | struct kvm_pmc *pmc = get_fixed_pmc_idx(pmu, i); | |
270 | ||
271 | if (fixed_en_pmi(pmu->fixed_ctr_ctrl, i) == en_pmi) | |
272 | continue; | |
273 | ||
274 | reprogram_fixed_counter(pmc, en_pmi, i); | |
275 | } | |
276 | ||
277 | pmu->fixed_ctr_ctrl = data; | |
278 | } | |
279 | ||
280 | static void reprogram_idx(struct kvm_pmu *pmu, int idx) | |
281 | { | |
282 | struct kvm_pmc *pmc = global_idx_to_pmc(pmu, idx); | |
283 | ||
284 | if (!pmc) | |
285 | return; | |
286 | ||
287 | if (pmc_is_gp(pmc)) | |
288 | reprogram_gp_counter(pmc, pmc->eventsel); | |
289 | else { | |
290 | int fidx = idx - X86_PMC_IDX_FIXED; | |
291 | reprogram_fixed_counter(pmc, | |
292 | fixed_en_pmi(pmu->fixed_ctr_ctrl, fidx), fidx); | |
293 | } | |
294 | } | |
295 | ||
296 | static void global_ctrl_changed(struct kvm_pmu *pmu, u64 data) | |
297 | { | |
298 | int bit; | |
299 | u64 diff = pmu->global_ctrl ^ data; | |
300 | ||
301 | pmu->global_ctrl = data; | |
302 | ||
303 | for_each_set_bit(bit, (unsigned long *)&diff, X86_PMC_IDX_MAX) | |
304 | reprogram_idx(pmu, bit); | |
305 | } | |
306 | ||
307 | bool kvm_pmu_msr(struct kvm_vcpu *vcpu, u32 msr) | |
308 | { | |
309 | struct kvm_pmu *pmu = &vcpu->arch.pmu; | |
310 | int ret; | |
311 | ||
312 | switch (msr) { | |
313 | case MSR_CORE_PERF_FIXED_CTR_CTRL: | |
314 | case MSR_CORE_PERF_GLOBAL_STATUS: | |
315 | case MSR_CORE_PERF_GLOBAL_CTRL: | |
316 | case MSR_CORE_PERF_GLOBAL_OVF_CTRL: | |
317 | ret = pmu->version > 1; | |
318 | break; | |
319 | default: | |
320 | ret = get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0) | |
321 | || get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0) | |
322 | || get_fixed_pmc(pmu, msr); | |
323 | break; | |
324 | } | |
325 | return ret; | |
326 | } | |
327 | ||
328 | int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data) | |
329 | { | |
330 | struct kvm_pmu *pmu = &vcpu->arch.pmu; | |
331 | struct kvm_pmc *pmc; | |
332 | ||
333 | switch (index) { | |
334 | case MSR_CORE_PERF_FIXED_CTR_CTRL: | |
335 | *data = pmu->fixed_ctr_ctrl; | |
336 | return 0; | |
337 | case MSR_CORE_PERF_GLOBAL_STATUS: | |
338 | *data = pmu->global_status; | |
339 | return 0; | |
340 | case MSR_CORE_PERF_GLOBAL_CTRL: | |
341 | *data = pmu->global_ctrl; | |
342 | return 0; | |
343 | case MSR_CORE_PERF_GLOBAL_OVF_CTRL: | |
344 | *data = pmu->global_ovf_ctrl; | |
345 | return 0; | |
346 | default: | |
347 | if ((pmc = get_gp_pmc(pmu, index, MSR_IA32_PERFCTR0)) || | |
348 | (pmc = get_fixed_pmc(pmu, index))) { | |
349 | *data = read_pmc(pmc); | |
350 | return 0; | |
351 | } else if ((pmc = get_gp_pmc(pmu, index, MSR_P6_EVNTSEL0))) { | |
352 | *data = pmc->eventsel; | |
353 | return 0; | |
354 | } | |
355 | } | |
356 | return 1; | |
357 | } | |
358 | ||
359 | int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data) | |
360 | { | |
361 | struct kvm_pmu *pmu = &vcpu->arch.pmu; | |
362 | struct kvm_pmc *pmc; | |
363 | ||
364 | switch (index) { | |
365 | case MSR_CORE_PERF_FIXED_CTR_CTRL: | |
366 | if (pmu->fixed_ctr_ctrl == data) | |
367 | return 0; | |
368 | if (!(data & 0xfffffffffffff444)) { | |
369 | reprogram_fixed_counters(pmu, data); | |
370 | return 0; | |
371 | } | |
372 | break; | |
373 | case MSR_CORE_PERF_GLOBAL_STATUS: | |
374 | break; /* RO MSR */ | |
375 | case MSR_CORE_PERF_GLOBAL_CTRL: | |
376 | if (pmu->global_ctrl == data) | |
377 | return 0; | |
378 | if (!(data & pmu->global_ctrl_mask)) { | |
379 | global_ctrl_changed(pmu, data); | |
380 | return 0; | |
381 | } | |
382 | break; | |
383 | case MSR_CORE_PERF_GLOBAL_OVF_CTRL: | |
384 | if (!(data & (pmu->global_ctrl_mask & ~(3ull<<62)))) { | |
385 | pmu->global_status &= ~data; | |
386 | pmu->global_ovf_ctrl = data; | |
387 | return 0; | |
388 | } | |
389 | break; | |
390 | default: | |
391 | if ((pmc = get_gp_pmc(pmu, index, MSR_IA32_PERFCTR0)) || | |
392 | (pmc = get_fixed_pmc(pmu, index))) { | |
393 | data = (s64)(s32)data; | |
394 | pmc->counter += data - read_pmc(pmc); | |
395 | return 0; | |
396 | } else if ((pmc = get_gp_pmc(pmu, index, MSR_P6_EVNTSEL0))) { | |
397 | if (data == pmc->eventsel) | |
398 | return 0; | |
399 | if (!(data & 0xffffffff00200000ull)) { | |
400 | reprogram_gp_counter(pmc, data); | |
401 | return 0; | |
402 | } | |
403 | } | |
404 | } | |
405 | return 1; | |
406 | } | |
407 | ||
408 | int kvm_pmu_read_pmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data) | |
409 | { | |
410 | struct kvm_pmu *pmu = &vcpu->arch.pmu; | |
411 | bool fast_mode = pmc & (1u << 31); | |
412 | bool fixed = pmc & (1u << 30); | |
413 | struct kvm_pmc *counters; | |
414 | u64 ctr; | |
415 | ||
416 | pmc &= (3u << 30) - 1; | |
417 | if (!fixed && pmc >= pmu->nr_arch_gp_counters) | |
418 | return 1; | |
419 | if (fixed && pmc >= pmu->nr_arch_fixed_counters) | |
420 | return 1; | |
421 | counters = fixed ? pmu->fixed_counters : pmu->gp_counters; | |
422 | ctr = read_pmc(&counters[pmc]); | |
423 | if (fast_mode) | |
424 | ctr = (u32)ctr; | |
425 | *data = ctr; | |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
430 | void kvm_pmu_cpuid_update(struct kvm_vcpu *vcpu) | |
431 | { | |
432 | struct kvm_pmu *pmu = &vcpu->arch.pmu; | |
433 | struct kvm_cpuid_entry2 *entry; | |
434 | unsigned bitmap_len; | |
435 | ||
436 | pmu->nr_arch_gp_counters = 0; | |
437 | pmu->nr_arch_fixed_counters = 0; | |
438 | pmu->counter_bitmask[KVM_PMC_GP] = 0; | |
439 | pmu->counter_bitmask[KVM_PMC_FIXED] = 0; | |
440 | pmu->version = 0; | |
441 | ||
442 | entry = kvm_find_cpuid_entry(vcpu, 0xa, 0); | |
443 | if (!entry) | |
444 | return; | |
445 | ||
446 | pmu->version = entry->eax & 0xff; | |
447 | if (!pmu->version) | |
448 | return; | |
449 | ||
450 | pmu->nr_arch_gp_counters = min((int)(entry->eax >> 8) & 0xff, | |
451 | X86_PMC_MAX_GENERIC); | |
452 | pmu->counter_bitmask[KVM_PMC_GP] = | |
453 | ((u64)1 << ((entry->eax >> 16) & 0xff)) - 1; | |
454 | bitmap_len = (entry->eax >> 24) & 0xff; | |
455 | pmu->available_event_types = ~entry->ebx & ((1ull << bitmap_len) - 1); | |
456 | ||
457 | if (pmu->version == 1) { | |
458 | pmu->global_ctrl = (1 << pmu->nr_arch_gp_counters) - 1; | |
459 | return; | |
460 | } | |
461 | ||
462 | pmu->nr_arch_fixed_counters = min((int)(entry->edx & 0x1f), | |
463 | X86_PMC_MAX_FIXED); | |
464 | pmu->counter_bitmask[KVM_PMC_FIXED] = | |
465 | ((u64)1 << ((entry->edx >> 5) & 0xff)) - 1; | |
466 | pmu->global_ctrl_mask = ~(((1 << pmu->nr_arch_gp_counters) - 1) | |
467 | | (((1ull << pmu->nr_arch_fixed_counters) - 1) | |
468 | << X86_PMC_IDX_FIXED)); | |
469 | } | |
470 | ||
471 | void kvm_pmu_init(struct kvm_vcpu *vcpu) | |
472 | { | |
473 | int i; | |
474 | struct kvm_pmu *pmu = &vcpu->arch.pmu; | |
475 | ||
476 | memset(pmu, 0, sizeof(*pmu)); | |
477 | for (i = 0; i < X86_PMC_MAX_GENERIC; i++) { | |
478 | pmu->gp_counters[i].type = KVM_PMC_GP; | |
479 | pmu->gp_counters[i].vcpu = vcpu; | |
480 | pmu->gp_counters[i].idx = i; | |
481 | } | |
482 | for (i = 0; i < X86_PMC_MAX_FIXED; i++) { | |
483 | pmu->fixed_counters[i].type = KVM_PMC_FIXED; | |
484 | pmu->fixed_counters[i].vcpu = vcpu; | |
485 | pmu->fixed_counters[i].idx = i + X86_PMC_IDX_FIXED; | |
486 | } | |
487 | init_irq_work(&pmu->irq_work, trigger_pmi); | |
488 | kvm_pmu_cpuid_update(vcpu); | |
489 | } | |
490 | ||
491 | void kvm_pmu_reset(struct kvm_vcpu *vcpu) | |
492 | { | |
493 | struct kvm_pmu *pmu = &vcpu->arch.pmu; | |
494 | int i; | |
495 | ||
496 | irq_work_sync(&pmu->irq_work); | |
497 | for (i = 0; i < X86_PMC_MAX_GENERIC; i++) { | |
498 | struct kvm_pmc *pmc = &pmu->gp_counters[i]; | |
499 | stop_counter(pmc); | |
500 | pmc->counter = pmc->eventsel = 0; | |
501 | } | |
502 | ||
503 | for (i = 0; i < X86_PMC_MAX_FIXED; i++) | |
504 | stop_counter(&pmu->fixed_counters[i]); | |
505 | ||
506 | pmu->fixed_ctr_ctrl = pmu->global_ctrl = pmu->global_status = | |
507 | pmu->global_ovf_ctrl = 0; | |
508 | } | |
509 | ||
510 | void kvm_pmu_destroy(struct kvm_vcpu *vcpu) | |
511 | { | |
512 | kvm_pmu_reset(vcpu); | |
513 | } | |
514 | ||
515 | void kvm_handle_pmu_event(struct kvm_vcpu *vcpu) | |
516 | { | |
517 | struct kvm_pmu *pmu = &vcpu->arch.pmu; | |
518 | u64 bitmask; | |
519 | int bit; | |
520 | ||
521 | bitmask = pmu->reprogram_pmi; | |
522 | ||
523 | for_each_set_bit(bit, (unsigned long *)&bitmask, X86_PMC_IDX_MAX) { | |
524 | struct kvm_pmc *pmc = global_idx_to_pmc(pmu, bit); | |
525 | ||
526 | if (unlikely(!pmc || !pmc->perf_event)) { | |
527 | clear_bit(bit, (unsigned long *)&pmu->reprogram_pmi); | |
528 | continue; | |
529 | } | |
530 | ||
531 | reprogram_idx(pmu, bit); | |
532 | } | |
533 | } |