On Sun, Oct 21, 2012 at 04:26:39PM -0400, Cole Robinson wrote: > On 10/19/2012 02:31 AM, Doug Goldstein wrote: > > Currently consumers of libvirt's APIs must assume/attempt to define a > > VM that uses spice, vnc, or sdl without knowing if the actual > > hypervisor supports it. Obviously my discussion is very QEMU oriented > > but it would be good to leave expansion for the future. I was thinking > > that under the <guest> element for the capabilities we can add > > something like: > > > > <graphics> > > <spice/> > > <vnc/> > > <sdl/> > > </graphics> > > > > This is something I've wanted to do for a long long time but my scope is much > bigger: libvirt really needs to report near everything it knows about qemu > emulator capabilities to the API user so we don't need to keep large > whitelists in apps like virt-manager. That doesn't mean we couldn't start here > though. > > The simplest place to put it is capabilties for sure, but if the scope is > going to grow to cover more XML parameters it might be worth considering a > separate API (but maybe we don't care if capabilities output is 100 pages > long). > > The XML format could quickly get hairy if you assume that in the future maybe > we want to report what graphics types support password or other arbitrary XML > elements, but maybe that's getting into the realm of rng schema.
On the one hand we already have per-emulator capabilities in the current XML document, we machine types and the <features> block showing <cpuselection/> and <deviceboot/> flags. I think we should *not* put it in the existing capabilities XML document though, because I think this will get enourmous very quickly - particularly if you consider that we need to report this same data for every single QEMU emulator we detect - and there are alot of them now. So I think we ought to have a separate API that can be used to query just the specific emulator you want to use. Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :| -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
