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Date: Wed, 17 Dec 2014 11:23:50 +0100
From: Alexander Graf <agraf@suse.de>
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Subject: Re: [Qemu-devel] [Qemu-ppc] Unable to loadvm on qemu-system-ppc -M
 g3beige (keyboard freeze)
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To: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, "qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>, qemu-devel <qemu-devel@nongnu.org>



On 17.12.14 11:17, Mark Cave-Ayland wrote:
> Hi all,
> 
> Whilst trying to debug a regression, I've found that I can't
> successfully execute a savevm/restart/loadvm sequence in qemu-system-ppc
> -M g3beige. The loadvm command succeeds after the restart, however the
> keyboard remains unresponsive making it impossible to continue from
> where I left off.
> 
> Steps to reproduce:
> 
> 1) Launch qemu-system-ppc as follows:
> 
> qemu-system-ppc -M g3beige -hda tmp.qcow2 -prom-env 'auto-boot?=false'
> 
> 2) Switch to the monitor in order to pause the VM and save
> 
> (qemu) stop
> (qemu) savevm test
> (qemu) c
> 
> 3) Switch back to the VGA display and confirm the keyboard works
> 
> 4) Close qemu-system-ppc
> 
> 5) Restart qemu-system-ppc with -loadvm options
> 
> qemu-system-ppc -M g3beige -prom-env 'auto-boot?=false' -loadvm test
> 
> 
> After the restart the keyboard is frozen and unresponsive. Some
> preliminary poking with gdb before and after seems to indicate that the
> cuda_receive_packet() functions aren't being called after the restart
> indicating that likely some state is missing from the savevm image and
> not being restored correctly. Anyone have any ideas as to what might be
> going wrong?

I don't think anyone has test the migration code on non-papr ppc for
quite a while. In fact, I'm surprised it's only the keyboard not working :).

You're more than invited to send patches to fix it! :)


Alex