Re: [libvirt] [PATCH 02/10] conf: support backend domain name in disk and network devices

On Fri, Feb 06, 2015 at 08:03:43PM +0000, Daniel P. Berrange wrote: > On Fri, Feb 06, 2015 at 07:11:40PM +0100, Marek Marczykowski-Górecki wrote: > > On Fri, Feb 06, 2015 at 05:36:40PM +0000, Daniel P. Berrange wrote: > > > On Thu, Feb 05, 2015 at 06:17:08AM +0100, Marek Marczykowski-Górecki wrote: > > > > At least Xen supports backend drivers in another domain (aka "driver > > > > domain"). This patch introduces XML config option for such setting as > > > > 'domain' attribute of 'source' element. Verification its content is left > > > > for the driver. > > > > > > > > In the future same option will be needed for USB devices (hostdev > > > > objects), but for now libxl doesn't have support for PVUSB. > > > > > > > > Signed-off-by: Marek Marczykowski-Górecki <marmarek(a)invisiblethingslab.com&gt; > > > > --- > > > > Changes in v2: > > > > - describe in docs/formatdomain.html.in > > > > - enforce empty domain tag (only 'name' attribute allowed) > > > > > > > > Changes in v3: > > > > - change <domain name='xx'/> element to domain='' attribute of source > > > > element - this is more logical place > > > > - grammar of docs > > > > > > I hate to say this, but I think the previous way you had it was > > > a better approach. A <domain name='xxxx'/> element is something > > > we can potentially add to any type of device, whereas the > > > <source domain='xxx'> approach will need to have different > > > XML for each type of device as they don't all have a <source> > > > element present. > > > > Ok, but perhaps some better name? When I read something like: > > <interface type='bridge'> > > <ip address='1.2.3.4'/> > > <domain name='netvm'/> > > </interface> > > it is really not obvious what domain this is about. When the same would > > be supported for PCI passthrough, it will be even more confusing: > > <interface type='hostdev' managed='yes'> > > <driver name='vfio'/> > > <source> > > <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/> > > </source> > > <mac address='52:54:00:6d:90:02'/> > > <domain name='netvm'/> > > </interface> > > > > Any ideas for a better name? > > Perhaps <iodomain name="netvm"> to clarify it a little ? Hmm, if we consider multi-word names, perhaps <backenddomain name='netvm'>?