// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2023, Tencent, Inc. */ #include #include #include "kvm_util.h" #include "processor.h" #include "pmu.h" const uint64_t intel_pmu_arch_events[] = { INTEL_ARCH_CPU_CYCLES, INTEL_ARCH_INSTRUCTIONS_RETIRED, INTEL_ARCH_REFERENCE_CYCLES, INTEL_ARCH_LLC_REFERENCES, INTEL_ARCH_LLC_MISSES, INTEL_ARCH_BRANCHES_RETIRED, INTEL_ARCH_BRANCHES_MISPREDICTED, INTEL_ARCH_TOPDOWN_SLOTS, INTEL_ARCH_TOPDOWN_BE_BOUND, INTEL_ARCH_TOPDOWN_BAD_SPEC, INTEL_ARCH_TOPDOWN_FE_BOUND, INTEL_ARCH_TOPDOWN_RETIRING, INTEL_ARCH_LBR_INSERTS, }; kvm_static_assert(ARRAY_SIZE(intel_pmu_arch_events) == NR_INTEL_ARCH_EVENTS); const uint64_t amd_pmu_zen_events[] = { AMD_ZEN_CORE_CYCLES, AMD_ZEN_INSTRUCTIONS_RETIRED, AMD_ZEN_BRANCHES_RETIRED, AMD_ZEN_BRANCHES_MISPREDICTED, }; kvm_static_assert(ARRAY_SIZE(amd_pmu_zen_events) == NR_AMD_ZEN_EVENTS); /* * For Intel Atom CPUs, the PMU events "Instruction Retired" or * "Branch Instruction Retired" may be overcounted for some certain * instructions, like FAR CALL/JMP, RETF, IRET, VMENTRY/VMEXIT/VMPTRLD * and complex SGX/SMX/CSTATE instructions/flows. * * The detailed information can be found in the errata (section SRF7): * https://edc.intel.com/content/www/us/en/design/products-and-solutions/processors-and-chipsets/sierra-forest/xeon-6700-series-processor-with-e-cores-specification-update/errata-details/ * * For the Atom platforms before Sierra Forest (including Sierra Forest), * Both 2 events "Instruction Retired" and "Branch Instruction Retired" would * be overcounted on these certain instructions, but for Clearwater Forest * only "Instruction Retired" event is overcounted on these instructions. */ static uint64_t get_pmu_errata(void) { if (!this_cpu_is_intel()) return 0; if (this_cpu_family() != 0x6) return 0; switch (this_cpu_model()) { case 0xDD: /* Clearwater Forest */ return BIT_ULL(INSTRUCTIONS_RETIRED_OVERCOUNT); case 0xAF: /* Sierra Forest */ case 0x4D: /* Avaton, Rangely */ case 0x5F: /* Denverton */ case 0x86: /* Jacobsville */ return BIT_ULL(INSTRUCTIONS_RETIRED_OVERCOUNT) | BIT_ULL(BRANCHES_RETIRED_OVERCOUNT); default: return 0; } } uint64_t pmu_errata_mask; void kvm_init_pmu_errata(void) { pmu_errata_mask = get_pmu_errata(); }