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

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Message-ID: <20100331125135.GW20695@one.firstfloor.org>
Date:	Wed, 31 Mar 2010 14:51:35 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andre Przywara <andre.przywara@....com>
Cc:	Andi Kleen <andi@...stfloor.org>, 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

> >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
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