From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olaf Hering <olaf@aepfle.de>
Subject: Re: Re: migration of pv guest fails from small to large
	host
Date: Thu, 7 Jul 2011 23:02:25 +0200
Message-ID: <20110707210225.GA32628@aepfle.de>
References: <20110701104148.GA32729@aepfle.de>
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	<20110705134601.GA2972@dumpdata.com>
	<20110707132042.GA30264@aepfle.de>
	<20110707183624.GA16619@dumpdata.com>
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To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: xen-devel@lists.xensource.com
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On Thu, Jul 07, Konrad Rzeszutek Wilk wrote:

> On Thu, Jul 07, 2011 at 06:20:42AM -0700, Olaf Hering wrote:
> > On Tue, Jul 05, Konrad Rzeszutek Wilk wrote:
> > 
> > > On Fri, Jul 01, 2011 at 06:20:23PM +0200, Olaf Hering wrote:
> > > > 
> > > > The situation with Linux 3.0 is different, crashes on target. With SLES11
> > > > kernel I can not attach to the console, the guest is appearently running.
> > > 
> > > What happens if you 'xl save', 'xl restore' on the same machine? Does that work?
> > 
> > save/restore on the same system works, just any form of transit from
> > small to large fails.
> 
> I am not sure what 'small' to 'large' means in this context? As in the
> migration from a machine with less memory than than the other? What happens
> if you migratte the other way? Does it work if you use the old style 'xm' commands?

xm or xl make no difference, they call the same helper function.
If the guest is started on a large system (>64GB), then migrated to a
small system (<64GB) and back to the large system nothing bad happens.
But if the guest is started on the small system, then migrated to the
large system the guest either crashes or hangs, depending on the guest
kernel. So far I have no handle what actually happens. Doing a dump
fails because the p2m stuff is not yet configured by the guest.

Today I wrote some debug code to get some tracing info, which I need to
test.

Olaf