linux-kernel - Re: [PATCH v5 21/28] x86/fpu/amx: Initialize child's AMX state

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Message-ID: <CAJvTdKnU6g2H-R67G8LCs4cs0_NqnOzoKbC3J+iNGayFE5RGMQ@mail.gmail.com>
Date:   Mon, 24 May 2021 13:37:08 -0400
From:   Len Brown <lenb@...nel.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     "Chang S. Bae" <chang.seok.bae@...el.com>,
        Borislav Petkov <bp@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        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>
Subject: Re: [PATCH v5 21/28] x86/fpu/amx: Initialize child's AMX state

On Sun, May 23, 2021 at 11:09 PM Andy Lutomirski <luto@...nel.org> wrote:

> If we're going to start having different states with different
> behaviors, let's make them real defines.
>
> #define XFEATURE_MASK_CLEARED_ON_CLONE ...

Probably a good idea.

However, "cleared on clone" isn't the property.
The property is that the state is treated as VOLATILE.

Len Brown, Intel Open Source Technology Center