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Re: [Qemu-devel] live migration between different qemu versions


From: Dr. David Alan Gilbert
Subject: Re: [Qemu-devel] live migration between different qemu versions
Date: Thu, 21 Jan 2016 11:49:38 +0000
User-agent: Mutt/1.5.24 (2015-08-30)

* Alexey (address@hidden) wrote:
> Hello,
> 
> On 2016-01-16 02:24, Eric Blake wrote:
> >On 01/12/2016 05:11 AM, Dr. David Alan Gilbert wrote:
> >
> >>>Tell me please right way to append zeros to "BIOS (ia32) ROM Ext.
> >>>(137*512)"
> >>>file?
> >>
> >>I'd use dd; something like:
> >>  dd if=/dev/zero bs=1 count=18944 >> theromfile
> >>I think that should do it (203264-184320=18944)
> >
> >Or simpler:
> >
> >truncate --size=203264 theromfile
> It's great! I have successfully did migration of VM from qemu 2.3.0 to qemu
> 2.5.0.
> 
> But when I try migrate to another side I got error:
> qemu-system-x86_64: error while loading state for instance 0x0 of device
> 'fw_cfg'
> qemu-system-x86_64: load of migration failed: No such file or directory
> 
> Is it possible to do this migration?

Backwards migration doens't get much upstream testing;  it looks like
this is the same as:

https://bugs.launchpad.net/qemu/+bug/1536487

Dave

> Regards,
> Alexey Mochkin.
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK



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