From mboxrd@z Thu Jan  1 00:00:00 1970
From: Borislav Petkov <bp@alien8.de>
Subject: Re: kvm: RDTSCP on AMD
Date: Mon, 10 Dec 2018 19:41:53 +0100
Message-ID: <20181210184153.GB5482@zn.tnic>
References: <20181210181328.GA762@zn.tnic>
 <20181210183730.GJ4669@habkost.net>
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Cc: Paolo Bonzini <pbonzini@redhat.com>,
        =?utf-8?B?SsO2cmcgUsO2ZGVs?= <joro@8bytes.org>,
        Andre Przywara <andre.przywara@arm.com>,
        kvm ML <kvm@vger.kernel.org>,
        lkml <linux-kernel@vger.kernel.org>,
        Tom Lendacky <thomas.lendacky@amd.com>
To: Eduardo Habkost <ehabkost@redhat.com>
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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.

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