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

[Alexey]

Hi David.

On 2016-01-11 22:51, Dr. David Alan Gilbert wrote:
> * Alexey (address@hidden) wrote:
> > Hello.
>
> Hi,
>
> > I have two servers between which I need have live migration.
> >
> > First server have QEMU emulator version 2.3.0
> > Second server have QEMU emulator version 2.5.0
> >
> > Migration command look like this:
> > /usr/bin/virsh migrate --live DOMAIN_NAME --migrateuri 
> > tcp://second.server
> > qemu+ssh://second.server/system --verbose
> >
> > I got next error on console:
> > error: operation failed: migration job: unexpectedly failed
> >
> > And next error in log on second server:
> > 2016-01-11T15:07:12.888647Z qemu-system-x86_64: Length too large:
> > /address@hidden/efi-virtio.rom: 0x32000 > 0x2d000: Invalid argument
> > 2016-01-11T15:07:12.888685Z qemu-system-x86_64: error while loading 
> > state
> > for instance 0x0 of device 'ram'
> > 2016-01-11T15:07:12.889733Z qemu-system-x86_64: load of migration 
> > failed:
> > Invalid argument
> >
> > In my libvirt domain I have option <rom bar="off"/>.
> >
> > I need to do a live migration in any possible way. How can I do this 
> > one?

> Is the efi-virtio ROM that you're using on the two versions the same
> identical size?
No, I have different efi-virtio.rom files, and I try to find a way which 
allows me not to copy the same efi-virtio.rom to all servers.

> Also, can you post the commandline that you're using please.
I already done this in my first email: virsh migrate...
> > /usr/bin/virsh migrate --live DOMAIN_NAME --migrateuri 
> > tcp://second.server
> > qemu+ssh://second.server/system --verbose

Regards,
Alexey Mochkin.