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

[Alexey]

Hello.

On 2016-01-21 14:49, Dr. David Alan Gilbert wrote:
> * 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
I saw it, thanks.

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

Regards,
Alexey Mochkin