On Thu, 08/22 11:22, Paolo Bonzini wrote: > Il 22/08/2013 10:53, Fam Zheng ha scritto: > >> > This is handy but only works if the QEMU process has permission to > >> > create temporary files. > >> > > > Yes, this is a shortcut, it has this limitation, but the good side is > > it's easy to get and no other dependency. > > > > To avoid creating file, we'll need blockdev-add to override backing_hd, > > and blockdev-backup to use an existing BDS as target, then we simply use > > current nbd-server-add to export it. > > > > This series is still RFC, with above said, we still need to decide which > > is the way we (QEMU and libvirt) want for 1.7. any thoughts? > > I think this was the initial design, but Kevin already said he didn't > like the idea. > > (Also, if you do this you have to add nbd-server-add to qmp-transaction, > to atomically start fleecing of multiple devices). > Kevin,
The downside of this is unresolvable (create file in QEMU), so I am giving up this and back to blockdev-add & blockdev-backup interface. So I guess I'm depending on your blockdev-add command patches, do you have a solution for overriding backing_hd there yet? If yes, do you have a working branch that I can rebase my blockdev-backup onto? Thanks. Fam
