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Date: Fri, 6 Nov 2015 15:48:11 +0000
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v9 00/56] Postcopy implementation
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To: Bharata B Rao <bharata@linux.vnet.ibm.com>
Cc: aarcange@redhat.com, yamahata@private.email.ne.jp, quintela@redhat.com, liang.z.li@intel.com, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, luis@cs.umu.se, Bharata B Rao <bharata.rao@gmail.com>, "amit.shah@redhat.com" <amit.shah@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, David Gibson <david@gibson.dropbear.id.au>

* Bharata B Rao (bharata@linux.vnet.ibm.com) wrote:

> > Where we have iterable, but non-postcopiable devices (e.g. htab
> > or block migration), complete them before forming the 'package'
> > but with the CPUs stopped.  This stops them filling up the package.
> 
> That helps and the migration suceeds now when I switch to postcopy
> immediately after starting the migration.

Excellent.

> However after postcopy migration, when I attempt to start an incoming
> instance again to migrate the guest back, I see this failure:
> 
> qemu-system-ppc64: cannot set up guest memory 'ppc_spapr.ram': Cannot allocate memory
> 
> The same doesn't happen with normal migration.

Huh that's fun; that's the original source guest that's running out of RAM?
It's original QEMU should be gone by that point.

> 
> I will see if I can debug this more tomorrow.

Thanks.

Dave

> 
> Regards,
> Bharata.
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK