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SubjectRe: [PATCH v4 3/7] perf/x86/amd/core: Detect PerfMonV2 support
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On 27/4/2022 7:31 pm, Sandipan Das wrote:

> x86_pmu.num_counters = AMD64_NUM_COUNTERS_CORE;

Thus boot_cpu_has(X86_FEATURE_PERFCTR_CORE) is true.

> +
> + /* Check for Performance Monitoring v2 support */
> + if (boot_cpu_has(X86_FEATURE_PERFMON_V2)) {
> + /* Update PMU version for later usage */
> + x86_pmu.version = 2;

Is it safe to assume that once AMD CPU has the PERFMON_V2 (or further) bit,

it must also have the PERFCTR_CORE bit set ?

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