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Re: [Xen-devel] pv 2.6.31 (kernel.org) and save/migrate, domU BUG()

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] pv 2.6.31 (kernel.org) and save/migrate, domU BUG()
From: Brendan Cully <brendan@xxxxxxxxxx>
Date: Thu, 12 Nov 2009 15:22:45 -0800
Cc: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "Xen-Devel \(E-mail\)" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On Thursday, 12 November 2009 at 15:16, Jeremy Fitzhardinge wrote:
> On 11/08/09 08:48, Pasi Kärkkäinen wrote:
> > Ok.. saving SMP guest fails for me too:
> >
> > [2009-11-09 23:44:38 1353] DEBUG (XendCheckpoint:110) [xc_save]: 
> > /usr/lib64/xen/bin/xc_save 28 2 0 0 0
> > [2009-11-09 23:44:38 1353] INFO (XendCheckpoint:417) xc_save: failed to get 
> > the suspend evtchn port
> >
> > Jeremy: Ideas what's causing that? "xm save" for UP guest works
> > OK, but for SMP guest it fails with the error above.
> There's no "suspend evtchn port" in a pvops kernel.  That looks like a
> Remus thing.  I think.

This is only an INFO-level message, because xc_save falls back to the
old xenstore method if it can't find a suspend event channel. I don't
know the context here, but this particular message ought to be

The event channel was made for Remus, but regular xc_save also uses it
to reduce the downtime at the end of live migration.

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