linux-kernel - Re: KVM warning about uncertified CPU for SMP for AMD model 2, stepping 3

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Message-ID: <20100331143640.GB1843@ucw.cz>
Date:	Wed, 31 Mar 2010 16:36:42 +0200
From:	Pavel Machek <pavel@....cz>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andre Przywara <andre.przywara@....com>,
	Jiri Kosina <jkosina@...e.cz>, Ingo Molnar <mingo@...e.hu>,
	Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Joerg Roedel <joerg.roedel@....com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: KVM warning about uncertified CPU for SMP for AMD model 2,
	stepping 3

On Wed 2010-03-31 14:51:35, Andi Kleen wrote:
> > >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.

It still seems better to fix kvm to emulate smp-capable cpu...

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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