linux-kernel - Re: [PATCH v4 22/22] x86/fpu/xstate: Introduce boot-parameters to control state component support

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Message-ID: <CAJvTdK=zZ7OYr9uO0GpoCG5iufe=NKhoWhkkHX0wTbajQNhYSw@mail.gmail.com>
Date:   Fri, 26 Mar 2021 11:36:46 -0400
From:   Len Brown <lenb@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     "Chang S. Bae" <chang.seok.bae@...el.com>,
        Borislav Petkov <bp@...e.de>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>, X86 ML <x86@...nel.org>,
        "Brown, Len" <len.brown@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "Liu, Jing2" <jing2.liu@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Documentation List <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v4 22/22] x86/fpu/xstate: Introduce boot-parameters to
 control state component support

On Thu, Mar 25, 2021 at 9:50 PM Thomas Gleixner <tglx@...utronix.de> wrote:

> Please provide the architectural document which guarantees that and does
> so in a way that it can be evaluated by the kernel. Have not seen that,
> so it does not exist at all.
>
>   Future CPUID attributes are as useful as the tweet of today.

I will do so the moment I am permitted.
I'm fine with dropping patch 22 until it can rely on the assurance of
that architectural feature.

thanks,
Len Brown, Intel Open Source Technology Center