linux-kernel - Re: Candidate Linux ABI for Intel AMX and hypothetical new related features

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAJvTdKm_sa869Xn-GVFPnka_B+-otf1FwoMtA-8PAYOaN99BnA@mail.gmail.com>
Date:   Fri, 9 Apr 2021 16:55:30 -0400
From:   Len Brown <lenb@...nel.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Andy Lutomirski <luto@...capital.net>,
        David Laight <David.Laight@...lab.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "Bae, Chang Seok" <chang.seok.bae@...el.com>,
        X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        libc-alpha <libc-alpha@...rceware.org>,
        Florian Weimer <fweimer@...hat.com>,
        Rich Felker <dalias@...c.org>, Kyle Huey <me@...ehuey.com>,
        Keno Fischer <keno@...iacomputing.com>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: Candidate Linux ABI for Intel AMX and hypothetical new related features

On Wed, Mar 31, 2021 at 6:54 PM Borislav Petkov <bp@...en8.de> wrote:
>
> On Wed, Mar 31, 2021 at 06:28:27PM -0400, Len Brown wrote:
> > dynamic XCR0 breaks the installed base, I thought we had established
> > that.
>
> We should do a clear cut and have legacy stuff which has its legacy
> expectations on the XSTATE layout and not touch those at all.
>
> And then all new apps which will use these new APIs can go and request
> whatever fancy new state constellations we support. Including how they
> want their signals handled, etc.
>
> Fat states like avx512, amx etc will be off by default and apps
> explicitly requesting those, can get them.
>
> That's it.

100% agreement from me!  (does anybody disagree?)

thanks,
Len Brown, Intel Open Source Technology Center