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Date: Tue, 19 Jan 2016 18:12:53 +0300
From: Alexey <alukardd@alukardd.org>
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Message-ID: <5a37c43587e03e8636a1ddfbfadd82f6@alukardd.org>
Subject: Re: [Qemu-devel] live migration between different qemu versions
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To: Eric Blake <eblake@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Qemu devel <qemu-devel@nongnu.org>

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?

Regards,
Alexey Mochkin.