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SubjectRe: [PATCH v3 2/3] x86/fpu: Add a helper to prepare AMX state for low-power CPU idle
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On 4/3/2022 9:37 AM, Thomas Gleixner wrote:
> On Thu, Mar 24 2022 at 19:22, Chang S. Bae wrote:
>> When a CPU enters an idle state, non-initialized states left in large
>> registers may be the cause of preventing deeper low-power states.
>>
>> The new helper ensures the AMX state is initialized to make the CPU
>> ready for low-power states. It will be used by the intel idle driver.
>
> What about AVX...AVX512? Are they harmless in that regard?

I double-checked with HW folks. Yes, that's the case. Their state
whether initialized or not does not prevent the processor from entering
a deeper low-power state.

>
> If so, then the first sentence above is confusing and should clearly
> spell out that it's AMX which causes that problem.

I see. Will do that.

Thanks,
Chang

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