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

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Date:	Thu, 3 Mar 2011 08:06:52 +0100
From:	Nikola Ciprich <extmaillist@...uxbox.cz>
To:	Zachary Amsden <zamsden@...hat.com>
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>
Subject: Re: regression - 2.6.36 -> 2.6.37 - kvm - 32bit SMP guests don't
	boot

> No worries.  What mess?
twice sending the same mail, nevermind :)

>
> I have two things you can try:
>
> first is running a single VCPU guest, if you have not done so already.
yup, UP guest is fine, just SMP doesn't work.

> Second is adding the bootparameter "clocksource=acpi_pm" to your guest  
> kernel.
yes, this makes SMP work too! I just realized when You were asking about current
clocksource, I told You only host source, not the guest. So I checked now,
and (at least for UP, I guess for SMP it's the same), the clocksource is
kvm-clock! So seems like it got broken with the TSC changes?


>
> If either of those fixes the problem, it very well have to do with this  
> change and not that you may be missing later dependent patches.  This  
> change should be nearly a 1-1 transformation, and if it is not,  
> something is wrong.
>
> What branch are you bisecting on, the kvm branch or the kernel tree  
> itself?  It would be helpful to see the exact code in case any  
> surrouding logic changed.
I was bisecting linus' linux-2.6.git main branch, between 2.6.36..2.6.37

>
> Thanks,
>
> Zach
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