1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * KVM PMU support for Intel CPUs 4 * 5 * Copyright 2011 Red Hat, Inc. and/or its affiliates. 6 * 7 * Authors: 8 * Avi Kivity <avi@redhat.com> 9 * Gleb Natapov <gleb@redhat.com> 10 */ 11 #include <linux/types.h> 12 #include <linux/kvm_host.h> 13 #include <linux/perf_event.h> 14 #include <asm/perf_event.h> 15 #include "x86.h" 16 #include "cpuid.h" 17 #include "lapic.h" 18 #include "nested.h" 19 #include "pmu.h" 20 21 #define MSR_PMC_FULL_WIDTH_BIT (MSR_IA32_PMC0 - MSR_IA32_PERFCTR0) 22 23 static struct kvm_event_hw_type_mapping intel_arch_events[] = { 24 [0] = { 0x3c, 0x00, PERF_COUNT_HW_CPU_CYCLES }, 25 [1] = { 0xc0, 0x00, PERF_COUNT_HW_INSTRUCTIONS }, 26 [2] = { 0x3c, 0x01, PERF_COUNT_HW_BUS_CYCLES }, 27 [3] = { 0x2e, 0x4f, PERF_COUNT_HW_CACHE_REFERENCES }, 28 [4] = { 0x2e, 0x41, PERF_COUNT_HW_CACHE_MISSES }, 29 [5] = { 0xc4, 0x00, PERF_COUNT_HW_BRANCH_INSTRUCTIONS }, 30 [6] = { 0xc5, 0x00, PERF_COUNT_HW_BRANCH_MISSES }, 31 /* The above index must match CPUID 0x0A.EBX bit vector */ 32 [7] = { 0x00, 0x03, PERF_COUNT_HW_REF_CPU_CYCLES }, 33 }; 34 35 /* mapping between fixed pmc index and intel_arch_events array */ 36 static int fixed_pmc_events[] = {1, 0, 7}; 37 38 static void reprogram_fixed_counters(struct kvm_pmu *pmu, u64 data) 39 { 40 struct kvm_pmc *pmc; 41 u8 old_fixed_ctr_ctrl = pmu->fixed_ctr_ctrl; 42 int i; 43 44 pmu->fixed_ctr_ctrl = data; 45 for (i = 0; i < pmu->nr_arch_fixed_counters; i++) { 46 u8 new_ctrl = fixed_ctrl_field(data, i); 47 u8 old_ctrl = fixed_ctrl_field(old_fixed_ctr_ctrl, i); 48 49 if (old_ctrl == new_ctrl) 50 continue; 51 52 pmc = get_fixed_pmc(pmu, MSR_CORE_PERF_FIXED_CTR0 + i); 53 54 __set_bit(INTEL_PMC_IDX_FIXED + i, pmu->pmc_in_use); 55 kvm_pmu_request_counter_reprogam(pmc); 56 } 57 } 58 59 static struct kvm_pmc *intel_pmc_idx_to_pmc(struct kvm_pmu *pmu, int pmc_idx) 60 { 61 if (pmc_idx < INTEL_PMC_IDX_FIXED) { 62 return get_gp_pmc(pmu, MSR_P6_EVNTSEL0 + pmc_idx, 63 MSR_P6_EVNTSEL0); 64 } else { 65 u32 idx = pmc_idx - INTEL_PMC_IDX_FIXED; 66 67 return get_fixed_pmc(pmu, idx + MSR_CORE_PERF_FIXED_CTR0); 68 } 69 } 70 71 static void reprogram_counters(struct kvm_pmu *pmu, u64 diff) 72 { 73 int bit; 74 struct kvm_pmc *pmc; 75 76 for_each_set_bit(bit, (unsigned long *)&diff, X86_PMC_IDX_MAX) { 77 pmc = intel_pmc_idx_to_pmc(pmu, bit); 78 if (pmc) 79 kvm_pmu_request_counter_reprogam(pmc); 80 } 81 } 82 83 static bool intel_hw_event_available(struct kvm_pmc *pmc) 84 { 85 struct kvm_pmu *pmu = pmc_to_pmu(pmc); 86 u8 event_select = pmc->eventsel & ARCH_PERFMON_EVENTSEL_EVENT; 87 u8 unit_mask = (pmc->eventsel & ARCH_PERFMON_EVENTSEL_UMASK) >> 8; 88 int i; 89 90 for (i = 0; i < ARRAY_SIZE(intel_arch_events); i++) { 91 if (intel_arch_events[i].eventsel != event_select || 92 intel_arch_events[i].unit_mask != unit_mask) 93 continue; 94 95 /* disable event that reported as not present by cpuid */ 96 if ((i < 7) && !(pmu->available_event_types & (1 << i))) 97 return false; 98 99 break; 100 } 101 102 return true; 103 } 104 105 /* check if a PMC is enabled by comparing it with globl_ctrl bits. */ 106 static bool intel_pmc_is_enabled(struct kvm_pmc *pmc) 107 { 108 struct kvm_pmu *pmu = pmc_to_pmu(pmc); 109 110 if (!intel_pmu_has_perf_global_ctrl(pmu)) 111 return true; 112 113 return test_bit(pmc->idx, (unsigned long *)&pmu->global_ctrl); 114 } 115 116 static bool intel_is_valid_rdpmc_ecx(struct kvm_vcpu *vcpu, unsigned int idx) 117 { 118 struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); 119 bool fixed = idx & (1u << 30); 120 121 idx &= ~(3u << 30); 122 123 return fixed ? idx < pmu->nr_arch_fixed_counters 124 : idx < pmu->nr_arch_gp_counters; 125 } 126 127 static struct kvm_pmc *intel_rdpmc_ecx_to_pmc(struct kvm_vcpu *vcpu, 128 unsigned int idx, u64 *mask) 129 { 130 struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); 131 bool fixed = idx & (1u << 30); 132 struct kvm_pmc *counters; 133 unsigned int num_counters; 134 135 idx &= ~(3u << 30); 136 if (fixed) { 137 counters = pmu->fixed_counters; 138 num_counters = pmu->nr_arch_fixed_counters; 139 } else { 140 counters = pmu->gp_counters; 141 num_counters = pmu->nr_arch_gp_counters; 142 } 143 if (idx >= num_counters) 144 return NULL; 145 *mask &= pmu->counter_bitmask[fixed ? KVM_PMC_FIXED : KVM_PMC_GP]; 146 return &counters[array_index_nospec(idx, num_counters)]; 147 } 148 149 static inline u64 vcpu_get_perf_capabilities(struct kvm_vcpu *vcpu) 150 { 151 if (!guest_cpuid_has(vcpu, X86_FEATURE_PDCM)) 152 return 0; 153 154 return vcpu->arch.perf_capabilities; 155 } 156 157 static inline bool fw_writes_is_enabled(struct kvm_vcpu *vcpu) 158 { 159 return (vcpu_get_perf_capabilities(vcpu) & PMU_CAP_FW_WRITES) != 0; 160 } 161 162 static inline struct kvm_pmc *get_fw_gp_pmc(struct kvm_pmu *pmu, u32 msr) 163 { 164 if (!fw_writes_is_enabled(pmu_to_vcpu(pmu))) 165 return NULL; 166 167 return get_gp_pmc(pmu, msr, MSR_IA32_PMC0); 168 } 169 170 static bool intel_pmu_is_valid_lbr_msr(struct kvm_vcpu *vcpu, u32 index) 171 { 172 struct x86_pmu_lbr *records = vcpu_to_lbr_records(vcpu); 173 bool ret = false; 174 175 if (!intel_pmu_lbr_is_enabled(vcpu)) 176 return ret; 177 178 ret = (index == MSR_LBR_SELECT) || (index == MSR_LBR_TOS) || 179 (index >= records->from && index < records->from + records->nr) || 180 (index >= records->to && index < records->to + records->nr); 181 182 if (!ret && records->info) 183 ret = (index >= records->info && index < records->info + records->nr); 184 185 return ret; 186 } 187 188 static bool intel_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr) 189 { 190 struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); 191 u64 perf_capabilities; 192 int ret; 193 194 switch (msr) { 195 case MSR_CORE_PERF_FIXED_CTR_CTRL: 196 case MSR_CORE_PERF_GLOBAL_STATUS: 197 case MSR_CORE_PERF_GLOBAL_CTRL: 198 case MSR_CORE_PERF_GLOBAL_OVF_CTRL: 199 return intel_pmu_has_perf_global_ctrl(pmu); 200 break; 201 case MSR_IA32_PEBS_ENABLE: 202 ret = vcpu_get_perf_capabilities(vcpu) & PERF_CAP_PEBS_FORMAT; 203 break; 204 case MSR_IA32_DS_AREA: 205 ret = guest_cpuid_has(vcpu, X86_FEATURE_DS); 206 break; 207 case MSR_PEBS_DATA_CFG: 208 perf_capabilities = vcpu_get_perf_capabilities(vcpu); 209 ret = (perf_capabilities & PERF_CAP_PEBS_BASELINE) && 210 ((perf_capabilities & PERF_CAP_PEBS_FORMAT) > 3); 211 break; 212 default: 213 ret = get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0) || 214 get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0) || 215 get_fixed_pmc(pmu, msr) || get_fw_gp_pmc(pmu, msr) || 216 intel_pmu_is_valid_lbr_msr(vcpu, msr); 217 break; 218 } 219 220 return ret; 221 } 222 223 static struct kvm_pmc *intel_msr_idx_to_pmc(struct kvm_vcpu *vcpu, u32 msr) 224 { 225 struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); 226 struct kvm_pmc *pmc; 227 228 pmc = get_fixed_pmc(pmu, msr); 229 pmc = pmc ? pmc : get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0); 230 pmc = pmc ? pmc : get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0); 231 232 return pmc; 233 } 234 235 static inline void intel_pmu_release_guest_lbr_event(struct kvm_vcpu *vcpu) 236 { 237 struct lbr_desc *lbr_desc = vcpu_to_lbr_desc(vcpu); 238 239 if (lbr_desc->event) { 240 perf_event_release_kernel(lbr_desc->event); 241 lbr_desc->event = NULL; 242 vcpu_to_pmu(vcpu)->event_count--; 243 } 244 } 245 246 int intel_pmu_create_guest_lbr_event(struct kvm_vcpu *vcpu) 247 { 248 struct lbr_desc *lbr_desc = vcpu_to_lbr_desc(vcpu); 249 struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); 250 struct perf_event *event; 251 252 /* 253 * The perf_event_attr is constructed in the minimum efficient way: 254 * - set 'pinned = true' to make it task pinned so that if another 255 * cpu pinned event reclaims LBR, the event->oncpu will be set to -1; 256 * - set '.exclude_host = true' to record guest branches behavior; 257 * 258 * - set '.config = INTEL_FIXED_VLBR_EVENT' to indicates host perf 259 * schedule the event without a real HW counter but a fake one; 260 * check is_guest_lbr_event() and __intel_get_event_constraints(); 261 * 262 * - set 'sample_type = PERF_SAMPLE_BRANCH_STACK' and 263 * 'branch_sample_type = PERF_SAMPLE_BRANCH_CALL_STACK | 264 * PERF_SAMPLE_BRANCH_USER' to configure it as a LBR callstack 265 * event, which helps KVM to save/restore guest LBR records 266 * during host context switches and reduces quite a lot overhead, 267 * check branch_user_callstack() and intel_pmu_lbr_sched_task(); 268 */ 269 struct perf_event_attr attr = { 270 .type = PERF_TYPE_RAW, 271 .size = sizeof(attr), 272 .config = INTEL_FIXED_VLBR_EVENT, 273 .sample_type = PERF_SAMPLE_BRANCH_STACK, 274 .pinned = true, 275 .exclude_host = true, 276 .branch_sample_type = PERF_SAMPLE_BRANCH_CALL_STACK | 277 PERF_SAMPLE_BRANCH_USER, 278 }; 279 280 if (unlikely(lbr_desc->event)) { 281 __set_bit(INTEL_PMC_IDX_FIXED_VLBR, pmu->pmc_in_use); 282 return 0; 283 } 284 285 event = perf_event_create_kernel_counter(&attr, -1, 286 current, NULL, NULL); 287 if (IS_ERR(event)) { 288 pr_debug_ratelimited("%s: failed %ld\n", 289 __func__, PTR_ERR(event)); 290 return PTR_ERR(event); 291 } 292 lbr_desc->event = event; 293 pmu->event_count++; 294 __set_bit(INTEL_PMC_IDX_FIXED_VLBR, pmu->pmc_in_use); 295 return 0; 296 } 297 298 /* 299 * It's safe to access LBR msrs from guest when they have not 300 * been passthrough since the host would help restore or reset 301 * the LBR msrs records when the guest LBR event is scheduled in. 302 */ 303 static bool intel_pmu_handle_lbr_msrs_access(struct kvm_vcpu *vcpu, 304 struct msr_data *msr_info, bool read) 305 { 306 struct lbr_desc *lbr_desc = vcpu_to_lbr_desc(vcpu); 307 u32 index = msr_info->index; 308 309 if (!intel_pmu_is_valid_lbr_msr(vcpu, index)) 310 return false; 311 312 if (!lbr_desc->event && intel_pmu_create_guest_lbr_event(vcpu) < 0) 313 goto dummy; 314 315 /* 316 * Disable irq to ensure the LBR feature doesn't get reclaimed by the 317 * host at the time the value is read from the msr, and this avoids the 318 * host LBR value to be leaked to the guest. If LBR has been reclaimed, 319 * return 0 on guest reads. 320 */ 321 local_irq_disable(); 322 if (lbr_desc->event->state == PERF_EVENT_STATE_ACTIVE) { 323 if (read) 324 rdmsrl(index, msr_info->data); 325 else 326 wrmsrl(index, msr_info->data); 327 __set_bit(INTEL_PMC_IDX_FIXED_VLBR, vcpu_to_pmu(vcpu)->pmc_in_use); 328 local_irq_enable(); 329 return true; 330 } 331 clear_bit(INTEL_PMC_IDX_FIXED_VLBR, vcpu_to_pmu(vcpu)->pmc_in_use); 332 local_irq_enable(); 333 334 dummy: 335 if (read) 336 msr_info->data = 0; 337 return true; 338 } 339 340 static int intel_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 341 { 342 struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); 343 struct kvm_pmc *pmc; 344 u32 msr = msr_info->index; 345 346 switch (msr) { 347 case MSR_CORE_PERF_FIXED_CTR_CTRL: 348 msr_info->data = pmu->fixed_ctr_ctrl; 349 return 0; 350 case MSR_CORE_PERF_GLOBAL_STATUS: 351 msr_info->data = pmu->global_status; 352 return 0; 353 case MSR_CORE_PERF_GLOBAL_CTRL: 354 msr_info->data = pmu->global_ctrl; 355 return 0; 356 case MSR_CORE_PERF_GLOBAL_OVF_CTRL: 357 msr_info->data = 0; 358 return 0; 359 case MSR_IA32_PEBS_ENABLE: 360 msr_info->data = pmu->pebs_enable; 361 return 0; 362 case MSR_IA32_DS_AREA: 363 msr_info->data = pmu->ds_area; 364 return 0; 365 case MSR_PEBS_DATA_CFG: 366 msr_info->data = pmu->pebs_data_cfg; 367 return 0; 368 default: 369 if ((pmc = get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0)) || 370 (pmc = get_gp_pmc(pmu, msr, MSR_IA32_PMC0))) { 371 u64 val = pmc_read_counter(pmc); 372 msr_info->data = 373 val & pmu->counter_bitmask[KVM_PMC_GP]; 374 return 0; 375 } else if ((pmc = get_fixed_pmc(pmu, msr))) { 376 u64 val = pmc_read_counter(pmc); 377 msr_info->data = 378 val & pmu->counter_bitmask[KVM_PMC_FIXED]; 379 return 0; 380 } else if ((pmc = get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0))) { 381 msr_info->data = pmc->eventsel; 382 return 0; 383 } else if (intel_pmu_handle_lbr_msrs_access(vcpu, msr_info, true)) 384 return 0; 385 } 386 387 return 1; 388 } 389 390 static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 391 { 392 struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); 393 struct kvm_pmc *pmc; 394 u32 msr = msr_info->index; 395 u64 data = msr_info->data; 396 u64 reserved_bits, diff; 397 398 switch (msr) { 399 case MSR_CORE_PERF_FIXED_CTR_CTRL: 400 if (pmu->fixed_ctr_ctrl == data) 401 return 0; 402 if (!(data & pmu->fixed_ctr_ctrl_mask)) { 403 reprogram_fixed_counters(pmu, data); 404 return 0; 405 } 406 break; 407 case MSR_CORE_PERF_GLOBAL_STATUS: 408 if (msr_info->host_initiated) { 409 pmu->global_status = data; 410 return 0; 411 } 412 break; /* RO MSR */ 413 case MSR_CORE_PERF_GLOBAL_CTRL: 414 if (pmu->global_ctrl == data) 415 return 0; 416 if (kvm_valid_perf_global_ctrl(pmu, data)) { 417 diff = pmu->global_ctrl ^ data; 418 pmu->global_ctrl = data; 419 reprogram_counters(pmu, diff); 420 return 0; 421 } 422 break; 423 case MSR_CORE_PERF_GLOBAL_OVF_CTRL: 424 if (!(data & pmu->global_ovf_ctrl_mask)) { 425 if (!msr_info->host_initiated) 426 pmu->global_status &= ~data; 427 return 0; 428 } 429 break; 430 case MSR_IA32_PEBS_ENABLE: 431 if (pmu->pebs_enable == data) 432 return 0; 433 if (!(data & pmu->pebs_enable_mask)) { 434 diff = pmu->pebs_enable ^ data; 435 pmu->pebs_enable = data; 436 reprogram_counters(pmu, diff); 437 return 0; 438 } 439 break; 440 case MSR_IA32_DS_AREA: 441 if (msr_info->host_initiated && data && !guest_cpuid_has(vcpu, X86_FEATURE_DS)) 442 return 1; 443 if (is_noncanonical_address(data, vcpu)) 444 return 1; 445 pmu->ds_area = data; 446 return 0; 447 case MSR_PEBS_DATA_CFG: 448 if (pmu->pebs_data_cfg == data) 449 return 0; 450 if (!(data & pmu->pebs_data_cfg_mask)) { 451 pmu->pebs_data_cfg = data; 452 return 0; 453 } 454 break; 455 default: 456 if ((pmc = get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0)) || 457 (pmc = get_gp_pmc(pmu, msr, MSR_IA32_PMC0))) { 458 if ((msr & MSR_PMC_FULL_WIDTH_BIT) && 459 (data & ~pmu->counter_bitmask[KVM_PMC_GP])) 460 return 1; 461 if (!msr_info->host_initiated && 462 !(msr & MSR_PMC_FULL_WIDTH_BIT)) 463 data = (s64)(s32)data; 464 pmc->counter += data - pmc_read_counter(pmc); 465 pmc_update_sample_period(pmc); 466 return 0; 467 } else if ((pmc = get_fixed_pmc(pmu, msr))) { 468 pmc->counter += data - pmc_read_counter(pmc); 469 pmc_update_sample_period(pmc); 470 return 0; 471 } else if ((pmc = get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0))) { 472 if (data == pmc->eventsel) 473 return 0; 474 reserved_bits = pmu->reserved_bits; 475 if ((pmc->idx == 2) && 476 (pmu->raw_event_mask & HSW_IN_TX_CHECKPOINTED)) 477 reserved_bits ^= HSW_IN_TX_CHECKPOINTED; 478 if (!(data & reserved_bits)) { 479 pmc->eventsel = data; 480 kvm_pmu_request_counter_reprogam(pmc); 481 return 0; 482 } 483 } else if (intel_pmu_handle_lbr_msrs_access(vcpu, msr_info, false)) 484 return 0; 485 } 486 487 return 1; 488 } 489 490 static void setup_fixed_pmc_eventsel(struct kvm_pmu *pmu) 491 { 492 size_t size = ARRAY_SIZE(fixed_pmc_events); 493 struct kvm_pmc *pmc; 494 u32 event; 495 int i; 496 497 for (i = 0; i < pmu->nr_arch_fixed_counters; i++) { 498 pmc = &pmu->fixed_counters[i]; 499 event = fixed_pmc_events[array_index_nospec(i, size)]; 500 pmc->eventsel = (intel_arch_events[event].unit_mask << 8) | 501 intel_arch_events[event].eventsel; 502 } 503 } 504 505 static void intel_pmu_refresh(struct kvm_vcpu *vcpu) 506 { 507 struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); 508 struct lbr_desc *lbr_desc = vcpu_to_lbr_desc(vcpu); 509 struct kvm_cpuid_entry2 *entry; 510 union cpuid10_eax eax; 511 union cpuid10_edx edx; 512 u64 perf_capabilities; 513 u64 counter_mask; 514 int i; 515 516 pmu->nr_arch_gp_counters = 0; 517 pmu->nr_arch_fixed_counters = 0; 518 pmu->counter_bitmask[KVM_PMC_GP] = 0; 519 pmu->counter_bitmask[KVM_PMC_FIXED] = 0; 520 pmu->version = 0; 521 pmu->reserved_bits = 0xffffffff00200000ull; 522 pmu->raw_event_mask = X86_RAW_EVENT_MASK; 523 pmu->global_ctrl_mask = ~0ull; 524 pmu->global_ovf_ctrl_mask = ~0ull; 525 pmu->fixed_ctr_ctrl_mask = ~0ull; 526 pmu->pebs_enable_mask = ~0ull; 527 pmu->pebs_data_cfg_mask = ~0ull; 528 529 entry = kvm_find_cpuid_entry(vcpu, 0xa); 530 if (!entry || !vcpu->kvm->arch.enable_pmu) 531 return; 532 eax.full = entry->eax; 533 edx.full = entry->edx; 534 535 pmu->version = eax.split.version_id; 536 if (!pmu->version) 537 return; 538 539 pmu->nr_arch_gp_counters = min_t(int, eax.split.num_counters, 540 kvm_pmu_cap.num_counters_gp); 541 eax.split.bit_width = min_t(int, eax.split.bit_width, 542 kvm_pmu_cap.bit_width_gp); 543 pmu->counter_bitmask[KVM_PMC_GP] = ((u64)1 << eax.split.bit_width) - 1; 544 eax.split.mask_length = min_t(int, eax.split.mask_length, 545 kvm_pmu_cap.events_mask_len); 546 pmu->available_event_types = ~entry->ebx & 547 ((1ull << eax.split.mask_length) - 1); 548 549 if (pmu->version == 1) { 550 pmu->nr_arch_fixed_counters = 0; 551 } else { 552 pmu->nr_arch_fixed_counters = 553 min3(ARRAY_SIZE(fixed_pmc_events), 554 (size_t) edx.split.num_counters_fixed, 555 (size_t)kvm_pmu_cap.num_counters_fixed); 556 edx.split.bit_width_fixed = min_t(int, edx.split.bit_width_fixed, 557 kvm_pmu_cap.bit_width_fixed); 558 pmu->counter_bitmask[KVM_PMC_FIXED] = 559 ((u64)1 << edx.split.bit_width_fixed) - 1; 560 setup_fixed_pmc_eventsel(pmu); 561 } 562 563 for (i = 0; i < pmu->nr_arch_fixed_counters; i++) 564 pmu->fixed_ctr_ctrl_mask &= ~(0xbull << (i * 4)); 565 counter_mask = ~(((1ull << pmu->nr_arch_gp_counters) - 1) | 566 (((1ull << pmu->nr_arch_fixed_counters) - 1) << INTEL_PMC_IDX_FIXED)); 567 pmu->global_ctrl_mask = counter_mask; 568 pmu->global_ovf_ctrl_mask = pmu->global_ctrl_mask 569 & ~(MSR_CORE_PERF_GLOBAL_OVF_CTRL_OVF_BUF | 570 MSR_CORE_PERF_GLOBAL_OVF_CTRL_COND_CHGD); 571 if (vmx_pt_mode_is_host_guest()) 572 pmu->global_ovf_ctrl_mask &= 573 ~MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI; 574 575 entry = kvm_find_cpuid_entry_index(vcpu, 7, 0); 576 if (entry && 577 (boot_cpu_has(X86_FEATURE_HLE) || boot_cpu_has(X86_FEATURE_RTM)) && 578 (entry->ebx & (X86_FEATURE_HLE|X86_FEATURE_RTM))) { 579 pmu->reserved_bits ^= HSW_IN_TX; 580 pmu->raw_event_mask |= (HSW_IN_TX|HSW_IN_TX_CHECKPOINTED); 581 } 582 583 bitmap_set(pmu->all_valid_pmc_idx, 584 0, pmu->nr_arch_gp_counters); 585 bitmap_set(pmu->all_valid_pmc_idx, 586 INTEL_PMC_MAX_GENERIC, pmu->nr_arch_fixed_counters); 587 588 perf_capabilities = vcpu_get_perf_capabilities(vcpu); 589 if (cpuid_model_is_consistent(vcpu) && 590 (perf_capabilities & PMU_CAP_LBR_FMT)) 591 x86_perf_get_lbr(&lbr_desc->records); 592 else 593 lbr_desc->records.nr = 0; 594 595 if (lbr_desc->records.nr) 596 bitmap_set(pmu->all_valid_pmc_idx, INTEL_PMC_IDX_FIXED_VLBR, 1); 597 598 if (perf_capabilities & PERF_CAP_PEBS_FORMAT) { 599 if (perf_capabilities & PERF_CAP_PEBS_BASELINE) { 600 pmu->pebs_enable_mask = counter_mask; 601 pmu->reserved_bits &= ~ICL_EVENTSEL_ADAPTIVE; 602 for (i = 0; i < pmu->nr_arch_fixed_counters; i++) { 603 pmu->fixed_ctr_ctrl_mask &= 604 ~(1ULL << (INTEL_PMC_IDX_FIXED + i * 4)); 605 } 606 pmu->pebs_data_cfg_mask = ~0xff00000full; 607 } else { 608 pmu->pebs_enable_mask = 609 ~((1ull << pmu->nr_arch_gp_counters) - 1); 610 } 611 } 612 } 613 614 static void intel_pmu_init(struct kvm_vcpu *vcpu) 615 { 616 int i; 617 struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); 618 struct lbr_desc *lbr_desc = vcpu_to_lbr_desc(vcpu); 619 620 for (i = 0; i < KVM_INTEL_PMC_MAX_GENERIC; i++) { 621 pmu->gp_counters[i].type = KVM_PMC_GP; 622 pmu->gp_counters[i].vcpu = vcpu; 623 pmu->gp_counters[i].idx = i; 624 pmu->gp_counters[i].current_config = 0; 625 } 626 627 for (i = 0; i < KVM_PMC_MAX_FIXED; i++) { 628 pmu->fixed_counters[i].type = KVM_PMC_FIXED; 629 pmu->fixed_counters[i].vcpu = vcpu; 630 pmu->fixed_counters[i].idx = i + INTEL_PMC_IDX_FIXED; 631 pmu->fixed_counters[i].current_config = 0; 632 } 633 634 lbr_desc->records.nr = 0; 635 lbr_desc->event = NULL; 636 lbr_desc->msr_passthrough = false; 637 } 638 639 static void intel_pmu_reset(struct kvm_vcpu *vcpu) 640 { 641 struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); 642 struct kvm_pmc *pmc = NULL; 643 int i; 644 645 for (i = 0; i < KVM_INTEL_PMC_MAX_GENERIC; i++) { 646 pmc = &pmu->gp_counters[i]; 647 648 pmc_stop_counter(pmc); 649 pmc->counter = pmc->prev_counter = pmc->eventsel = 0; 650 } 651 652 for (i = 0; i < KVM_PMC_MAX_FIXED; i++) { 653 pmc = &pmu->fixed_counters[i]; 654 655 pmc_stop_counter(pmc); 656 pmc->counter = pmc->prev_counter = 0; 657 } 658 659 pmu->fixed_ctr_ctrl = pmu->global_ctrl = pmu->global_status = 0; 660 661 intel_pmu_release_guest_lbr_event(vcpu); 662 } 663 664 /* 665 * Emulate LBR_On_PMI behavior for 1 < pmu.version < 4. 666 * 667 * If Freeze_LBR_On_PMI = 1, the LBR is frozen on PMI and 668 * the KVM emulates to clear the LBR bit (bit 0) in IA32_DEBUGCTL. 669 * 670 * Guest needs to re-enable LBR to resume branches recording. 671 */ 672 static void intel_pmu_legacy_freezing_lbrs_on_pmi(struct kvm_vcpu *vcpu) 673 { 674 u64 data = vmcs_read64(GUEST_IA32_DEBUGCTL); 675 676 if (data & DEBUGCTLMSR_FREEZE_LBRS_ON_PMI) { 677 data &= ~DEBUGCTLMSR_LBR; 678 vmcs_write64(GUEST_IA32_DEBUGCTL, data); 679 } 680 } 681 682 static void intel_pmu_deliver_pmi(struct kvm_vcpu *vcpu) 683 { 684 u8 version = vcpu_to_pmu(vcpu)->version; 685 686 if (!intel_pmu_lbr_is_enabled(vcpu)) 687 return; 688 689 if (version > 1 && version < 4) 690 intel_pmu_legacy_freezing_lbrs_on_pmi(vcpu); 691 } 692 693 static void vmx_update_intercept_for_lbr_msrs(struct kvm_vcpu *vcpu, bool set) 694 { 695 struct x86_pmu_lbr *lbr = vcpu_to_lbr_records(vcpu); 696 int i; 697 698 for (i = 0; i < lbr->nr; i++) { 699 vmx_set_intercept_for_msr(vcpu, lbr->from + i, MSR_TYPE_RW, set); 700 vmx_set_intercept_for_msr(vcpu, lbr->to + i, MSR_TYPE_RW, set); 701 if (lbr->info) 702 vmx_set_intercept_for_msr(vcpu, lbr->info + i, MSR_TYPE_RW, set); 703 } 704 705 vmx_set_intercept_for_msr(vcpu, MSR_LBR_SELECT, MSR_TYPE_RW, set); 706 vmx_set_intercept_for_msr(vcpu, MSR_LBR_TOS, MSR_TYPE_RW, set); 707 } 708 709 static inline void vmx_disable_lbr_msrs_passthrough(struct kvm_vcpu *vcpu) 710 { 711 struct lbr_desc *lbr_desc = vcpu_to_lbr_desc(vcpu); 712 713 if (!lbr_desc->msr_passthrough) 714 return; 715 716 vmx_update_intercept_for_lbr_msrs(vcpu, true); 717 lbr_desc->msr_passthrough = false; 718 } 719 720 static inline void vmx_enable_lbr_msrs_passthrough(struct kvm_vcpu *vcpu) 721 { 722 struct lbr_desc *lbr_desc = vcpu_to_lbr_desc(vcpu); 723 724 if (lbr_desc->msr_passthrough) 725 return; 726 727 vmx_update_intercept_for_lbr_msrs(vcpu, false); 728 lbr_desc->msr_passthrough = true; 729 } 730 731 /* 732 * Higher priority host perf events (e.g. cpu pinned) could reclaim the 733 * pmu resources (e.g. LBR) that were assigned to the guest. This is 734 * usually done via ipi calls (more details in perf_install_in_context). 735 * 736 * Before entering the non-root mode (with irq disabled here), double 737 * confirm that the pmu features enabled to the guest are not reclaimed 738 * by higher priority host events. Otherwise, disallow vcpu's access to 739 * the reclaimed features. 740 */ 741 void vmx_passthrough_lbr_msrs(struct kvm_vcpu *vcpu) 742 { 743 struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); 744 struct lbr_desc *lbr_desc = vcpu_to_lbr_desc(vcpu); 745 746 if (!lbr_desc->event) { 747 vmx_disable_lbr_msrs_passthrough(vcpu); 748 if (vmcs_read64(GUEST_IA32_DEBUGCTL) & DEBUGCTLMSR_LBR) 749 goto warn; 750 if (test_bit(INTEL_PMC_IDX_FIXED_VLBR, pmu->pmc_in_use)) 751 goto warn; 752 return; 753 } 754 755 if (lbr_desc->event->state < PERF_EVENT_STATE_ACTIVE) { 756 vmx_disable_lbr_msrs_passthrough(vcpu); 757 __clear_bit(INTEL_PMC_IDX_FIXED_VLBR, pmu->pmc_in_use); 758 goto warn; 759 } else 760 vmx_enable_lbr_msrs_passthrough(vcpu); 761 762 return; 763 764 warn: 765 pr_warn_ratelimited("kvm: vcpu-%d: fail to passthrough LBR.\n", 766 vcpu->vcpu_id); 767 } 768 769 static void intel_pmu_cleanup(struct kvm_vcpu *vcpu) 770 { 771 if (!(vmcs_read64(GUEST_IA32_DEBUGCTL) & DEBUGCTLMSR_LBR)) 772 intel_pmu_release_guest_lbr_event(vcpu); 773 } 774 775 void intel_pmu_cross_mapped_check(struct kvm_pmu *pmu) 776 { 777 struct kvm_pmc *pmc = NULL; 778 int bit, hw_idx; 779 780 for_each_set_bit(bit, (unsigned long *)&pmu->global_ctrl, 781 X86_PMC_IDX_MAX) { 782 pmc = intel_pmc_idx_to_pmc(pmu, bit); 783 784 if (!pmc || !pmc_speculative_in_use(pmc) || 785 !intel_pmc_is_enabled(pmc) || !pmc->perf_event) 786 continue; 787 788 /* 789 * A negative index indicates the event isn't mapped to a 790 * physical counter in the host, e.g. due to contention. 791 */ 792 hw_idx = pmc->perf_event->hw.idx; 793 if (hw_idx != pmc->idx && hw_idx > -1) 794 pmu->host_cross_mapped_mask |= BIT_ULL(hw_idx); 795 } 796 } 797 798 struct kvm_pmu_ops intel_pmu_ops __initdata = { 799 .hw_event_available = intel_hw_event_available, 800 .pmc_is_enabled = intel_pmc_is_enabled, 801 .pmc_idx_to_pmc = intel_pmc_idx_to_pmc, 802 .rdpmc_ecx_to_pmc = intel_rdpmc_ecx_to_pmc, 803 .msr_idx_to_pmc = intel_msr_idx_to_pmc, 804 .is_valid_rdpmc_ecx = intel_is_valid_rdpmc_ecx, 805 .is_valid_msr = intel_is_valid_msr, 806 .get_msr = intel_pmu_get_msr, 807 .set_msr = intel_pmu_set_msr, 808 .refresh = intel_pmu_refresh, 809 .init = intel_pmu_init, 810 .reset = intel_pmu_reset, 811 .deliver_pmi = intel_pmu_deliver_pmi, 812 .cleanup = intel_pmu_cleanup, 813 }; 814