Hi, at https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1291321 it was found that migrating running vms from a machine with qemu-kvm to one with qemu, migration fails due to some mismatches. The first one we usually hit is
Length mismatch: vga.vram: 1000000 in != 800000 while the second one is network card (and I have not gone beyond that). The vga one can be handled on the command line by specifying the -global cirrus-vga.vrammem_mb=8. However that doesn't help with a libvirt migration. I guess this happens at ram_load() unfortunately - is there any good way that this could be detected at incoming migration time and the virtual hardware modified as needed for migration to continue? thanks, -serge
