From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andi Kleen <andi@firstfloor.org>
Subject: Re: KVM warning about uncertified CPU for SMP for AMD model 2, stepping 3
Date: Wed, 31 Mar 2010 14:51:35 +0200
Message-ID: <20100331125135.GW20695@one.firstfloor.org>
References: <alpine.LNX.2.00.1003310047470.24576@pobox.suse.cz> <20100331024213.GV20695@one.firstfloor.org> <4BB33C0D.9090808@amd.com>
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Cc: Andi Kleen <andi@firstfloor.org>, Jiri Kosina <jkosina@suse.cz>,
	Ingo Molnar <mingo@elte.hu>, Avi Kivity <avi@redhat.com>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	Joerg Roedel <joerg.roedel@amd.com>,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org
To: Andre Przywara <andre.przywara@amd.com>
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> >I guess these warnings could be just disabled. With nearly everyone
> >using multi-core these days they are kind of obsolete anyways.
> Well, the warning refers to an old single-core only CPU model. Most of 
> those were able to run in SMP boards, but only a subset of them was 
> officially certified to do so (Athlon-MP instead of Athlon-XP).

Thanks for pointing out the obvious.

> To avoid complaints about instability of such systems, the warning was 
> introduced. If you consider these systems still supported, I wouldn't 
> disable this warning, at least the check should be disabled only if the 
> hypervisor CPUID bit is set.

The point was that everyone can have a multi-core system for cheap
these days, no real motivation for anyone anymore to use old unsupported
configurations to get one.

-Andi