Re: [PATCH V2 1/25] x86/cpufeatures: Enumerate Intel Hybrid Technology feature bit

[Borislav Petkov]

On Wed, Mar 10, 2021 at 11:46:44AM -0800, Ricardo Neri wrote:
> But this series provides the use case, right? Kan's patches handle PMU counters
> that may differ cross types of CPUs. In patch 2, get_hybrid_params()
> needs to check first if X86_FEATURE_HYBRID_CPU is enabled before
> querying the hybrid parameters. Otherwise, we would need to rely on the
> maximum level of CPUID, which may not be reliable.

On Wed, Mar 10, 2021 at 11:33:54AM -0800, Srinivas Pandruvada wrote:
> We are working on changes to P-State driver for hybrid CPUs using this
> define. They are still work in progress.
> But this patch can be submitted later with our set of changes.

Answering to both with a single mail:

I don't have a problem with X86_FEATURE_HYBRID_CPU - I simply don't want
to show "hybrid_cpu" in /proc/cpuinfo unless there's a valid use case
for userspace to know that it is running on a hybrid CPU.

-- 
Regards/Gruss,
    Boris.

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