On Thu, Aug 01, 2024 at 11:36:19AM -0400, Peter Xu wrote: > On Thu, Aug 01, 2024 at 01:51:00AM -0400, Michael S. Tsirkin wrote: > > So I suggest a single command that dumps some description of host > > features, to be passed to qemu on destination. qemu then fails to > > start on destination if some of these do not work. > > The advantage is that this also helps things like -cpu host, > > and a bunch of other things like vdpa where we like to pass through > > config from kernel. > > Something like that could work indeed. I'm thinking whether it shouldn't > require a new QMP command; that sounds more work, and we also needs Libvirt > cooperations so QEMU migration will still fail. I wonder whether we can > integrate it into migration handshake that I referred previously in our > TODO item here: > > https://wiki.qemu.org/ToDo/LiveMigration#Migration_handshake This is different. You can start migration on destination without touching source at all. This allows e.g. finding a destination that can support your source.
