On Wed, Nov 25, 2009 at 02:42:25PM +0100, Gerd Hoffmann wrote: >>> And this is also the trivial part to describe: I want a >>> machine like the one in qemu-0.11. >> >> Yes, but there might be a ton of reasons to want a >> machine like the one in qemu 0.11. >> The need to migrate to old qemu is very rare, >> it is a completely separate decision >> one might take long after starting qemu, > > Doesn't work. If you have a qemu 0.11 machine, a virtio nic and your > guest uses MSI-X you simply can't migrate to qemu 0.10. End of story. > If you want to be able to migrate to 0.10 you have to start in 0.10 > compat mode with MSI-X disabled. So IMHO it does makes sense to tie the > savevm format to -M pc-<version>. > > cheers, > Gerd
MSI-X is an orthogonal issue, let's not mix it in. Maybe you are using e1000, or maybe you disabled MSI-X with a flag. -- MST
