linux-kernel - Re: regression - 2.6.36 -> 2.6.37 - kvm

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Date:	Thu, 03 Mar 2011 16:58:33 -0500
From:	Zachary Amsden <zamsden@...hat.com>
To:	Nikola Ciprich <extmaillist@...uxbox.cz>
CC:	Avi Kivity <avi@...hat.com>,
	Nikola Ciprich <nikola.ciprich@...uxbox.cz>,
	KVM list <kvm@...r.kernel.org>,
	Linux kernel list <linux-kernel@...r.kernel.org>,
	Glauber Costa <glommer@...hat.com>
Subject: Re: regression - 2.6.36 -> 2.6.37 - kvm - 32bit SMP guests don't
 boot

On 03/03/2011 04:06 PM, Nikola Ciprich wrote:
>> What is the exact kernel version you are using in the guest.
>>      
> It's latest centos (2.6.18-194.32.1.el5), so I guess there are a lot
> of fixes, but it's possible the kvm-clock is broken in it.
> I can't influence what kernel is used there (at least not on customer's
> guests), but I guess asking for adding clocksource kernel parameter is
> not problem.
>
>    

That sounds like a kernel which will be vulnerable to broken KVM clock 
on 32-bit.  There's a kernel side fix that is needed, but why the server 
side change triggers the problem needs more investigation.

Zach
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