Re: [libvirt] RFC: Exposing backing chains in <domain> XML

On Wed, Mar 12, 2014 at 05:34:17PM -0600, Eric Blake wrote: > Hmm. Another feature coming down the pipes in qemu 2.0 is the ability > to give an alias to any portion of the backing chain. Right now, we > have an <alias> element tied to the <disk> as a whole (in qemu parlance, > the device id), but some qemu operations will be easier if we also have > a name tied to each file in the chain (in qemu parlance, a node id for > the bd [block driver structure]). Maybe we kill two birds with one > stone, by having each <backingStore> track an <alias> sub-element with > the name of the node, when communicating with qemu 2.0 and newer. I like the idea of having a string-alias against each node to allow unambigously references to it. We could do an integer index, but a string alias is a bit more flexible, allowing us to tie the alias value to the QEMU name if desired.