Re: [Qemu-stable] Migration from older Qemu to Qemu 2.0.0 does not work

[Paolo Bonzini]

Il 14/05/2014 09:17, Stefan Priebe - Profihost AG ha scritto:
> i now was able to catch the error.
>
> It is:
> Length mismatch: 0000:00:12.0/virtio-net-pci.rom: 40000 in != 10000
> qemu: warning: error while loading state for instance 0x0 of device 'ram'
> load of migration failed

This is a bug of your distribution.  The file sizes for ROMs should 
never change.  In particular, if you round the sizes up to the next 
power of 2 you should always have:

128k for bios.bin
256k for bios-256k.bin
64k for pxe-*.rom
256k for efi-*.rom
64k for vgabios-*

Unfortunately, most distribution get pxe-*.rom sizes wrong, because at 
some point iPXE grew more features and didn't fit in 64k anymore with 
the default configuration.  I know at least Fedora does.

The solution is to copy the binaries from the QEMU git repository 
(directory pc-bios/) to /usr/share/qemu.

Paolo