Re: [PATCH v2 1/1] Documentation/x86: Add the AMX enabling example

[Chang S. Bae]

On 6/30/2022 9:07 AM, Luck, Tony wrote:
> > But these state components are architectural. While this can help
> > userspace anyway, saying "XSTATE component" here and on the man-page is
> > probably it as they are already defined in the x86 spec.
>
> An application writer can't use:
>
> # include {x86 spec}"
>
> to get these values ... if applications need them to find out if AMX is present,
> and to enable it, then they need an API.

Yeah, you're right.

> Maybe your example code should just be a library routine? So application writers
> can just do:
>
> if (!intel_amx_enable()) {
> error message, or fall back to non-AMX implementation
> }
>
> without having to worry about those #defines.

I guess we cannot assume this. Given the arch_prctl() options, they can 
do this by themselves.

Let me include those defines on the next version.

Thanks,
Chang