linux-kernel - Re: kvm: RDTSCP on AMD

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: <20181210184153.GB5482@zn.tnic>
Date:   Mon, 10 Dec 2018 19:41:53 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Eduardo Habkost <ehabkost@...hat.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Jörg Rödel <joro@...tes.org>,
        Andre Przywara <andre.przywara@....com>,
        kvm ML <kvm@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: kvm: RDTSCP on AMD

On Mon, Dec 10, 2018 at 04:37:30PM -0200, Eduardo Habkost wrote:
> It isn't as simply as reverting commit 33b5e8c03ae7, but we can
> surely re-add RDTSCP on pc-*-4.0 and newer.

Sure. If you could only point me to an example how to add that to
pc-*-4.0 and newer, I'll gladly cook up a patch and test it.

> I thought we added documentation mentioning the minimum kernel
> version required by QEMU, but I can't find it.  In either case,
> it seems reasonable to require Linux 4.5 or newer on newer
> machine-types.

When you say "require" does that mean, one puts it in a text file
somewhere in the qemu sources or do we enforce it somehow?

Thx.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.