Re: [PATCH v4 3/7] perf/x86/amd/core: Detect PerfMonV2 support

[Like Xu]

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 ?