x86_pmu_fixed_ctr_addr
hwc->event_base = x86_pmu_fixed_ctr_addr(idx - INTEL_PMC_IDX_FIXED);
rdmsrq(x86_pmu_fixed_ctr_addr(idx), pmc_count);
wrmsrq(x86_pmu_fixed_ctr_addr(i - INTEL_PMC_IDX_FIXED), 0);
wrmsrq_safe(x86_pmu_fixed_ctr_addr(idx), 0ull);