Re: [libvirt] [PATCH v4 6/6] qemu-command: introduce new vgamem attribute for QXL video device

Well, I think that this is not correct usage of the libvirt XML. You should not just change one part of the device configuration. If user of virt-manager change the device type, you should create a new XML according to the new device type and copy all valid values and then drop the original XML configuration. I don't think that just silently remove unsupported configuration is appropriate solution. Even if we will print warning that it's not supported and it will be removed I still don't like it.