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

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Message-Id: <5a645958-10ab-46e7-9650-e5746a8d2276@www.fastmail.com>
Date:   Mon, 24 May 2021 11:13:53 -0700
From:   "Andy Lutomirski" <luto@...nel.org>
To:     "Len Brown" <lenb@...nel.org>
Cc:     "Bae, Chang Seok" <chang.seok.bae@...el.com>,
        "Borislav Petkov" <bp@...e.de>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...nel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        "Brown, Len" <len.brown@...el.com>,
        "Dave Hansen" <dave.hansen@...el.com>,
        "Liu, Jing2" <jing2.liu@...el.com>,
        "Shankar, Ravi V" <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 Mon, May 24, 2021, at 10:37 AM, Len Brown wrote:
> 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.
> 

What does VOLATILE mean in this context?