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

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Message-ID: <4D7101AF.6060009@redhat.com>
Date:	Fri, 04 Mar 2011 10:13:51 -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 05:01 PM, Nikola Ciprich wrote:
>> 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.
>>      
> OK, it's important for me that I can fix this by kernel parameter,
> but if I can help somehow with debugging, please let me know.
> thanks for Your time!
> nik
>    

You don't see any messages about TSC being unstable or switching 
clocksource after loading the KVM module?  And you are not suspending 
the host or anything?

Can you try using "processor.max_cstate=1" on the host as a kernel 
parameter and see if it makes a difference?
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