Re: [Qemu-devel] Live migrate, inconsistent machine types - new machine type to fix?

[Alex Bligh]

Paolo,

On 19 Jul 2014, at 06:51, Paolo Bonzini <address@hidden> wrote:

>> Restoring the machine with the command line [2] (merely adding -machine 
>> pc-1.0 which is not the default for qemu-2.0) produces the error:
>> Length mismatch: vga.vram: 1000000 in != 800000
>> qemu: warning: error while loading state for instance 0x0 of device 'ram'
>> load of migration failed
> 
> This is unfortunately a known difference between qemu-kvm and qemu.

Indeed. So this one I can work around.

>> This can be fixed using command line [3] (adding an additional -global 
>> cirrus-vga.vgamem_mb=10) in which case it gets a little further.
>> Length mismatch: 0000:00:03.0/virtio-net-pci.rom: 10000 in != 20000
>> qemu: warning: error while loading state for instance 0x0 of device 'ram'
>> load of migration failed
> 
> Looks like your source and destination machines have different iPXE
> ROMs.  This could be a packaging problem in your distro.

This is Ubuntu 12.04 to Ubuntu 14.04. I think the 14.04 one is correct, and 
don't want to run with a non-standard qemu there.

Can I use a different ROM (e.g. the old one) with a command line option just 
for the migrated machines? Obviously when they reboot, they'l get a hardware 
change (which is fine). Obviously the iPXE ROM makes no difference when the 
machine is running, it's purely the size which is causing an issue.

-- 
Alex Bligh