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SubjectRe: [PATCH v4 22/22] x86/fpu/xstate: Introduce boot-parameters to control state component support
On Thu, Mar 25, 2021 at 9:42 PM Andy Lutomirski <luto@kernel.org> wrote:

> Regardless of what you call AMX, AMX requires kernel enabling.

I submit, that after the generic XFD support is in place,
there is exactly 1 bit that needs to be flipped to enable
user applications to benefit from AMX.

I submit the patch that knows about AMX and double checks the
state size is superfluous.

I submit that updating /proc/cpuinfo is superfluous.

What AMX-specific kernel enabling did I miss?

> Specifically, it appears that leaving AMX in use in the XINUSE sense
> degrades system performance and/or power.

Please share the specifics about what performance or power issue you anticipate.

thanks,
-Len

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