On Tue, Mar 30, 2021 at 09:35:48 +0000, Waleed Musa wrote: > Hi all, > > I see in libvirt you are supporting attach/detach devices to existing xml > domain using attachDeviceFlags and detachDeviceFlags APIs. > Now we are adding some qemu command to the xml domain related to some > interfaces using alias names before starting the VM, but we will face an > issue with hot plug such devices, so I have two question here: > > 1. Is it applicable to set the alias names for interfaces because I saw > it's ignored when I add it to xml domain before starting the VM?
User specified aliases are possible with 'ua-' prefix: https://www.libvirt.org/formatdomain.html#devices > 2. Is there a way or API to attach qemu commands to running domain as you > are doing in attaching the device using attachDeviceFlags? No. For VMs which use <qemu:commandline> we don't formally provide support. I suggest that if you have a good use case for the attributes below, you send patches adding the functionality to libvirt if you want to have it on device hotplug. > > Example of my xml > <domain type='kvm' id='5' > xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> > <devices> > <interface type='vhostuser'> > <mac address='fa:16:3e:ac:12:4c'/> > <source type='unix' path='/var/lib/vhost_sockets/sockbbb6bbe9-eb5' > mode='server'/> > <target dev='tapbbb6bbe9-eb'/> > <model type='virtio'/> > <driver queues='4' rx_queue_size='512' tx_queue_size='512'/> > <alias name='net0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x03' > function='0x0'/> > </interface> > </devices> > <qemu:commandline> > <qemu:arg value='-set'/> > <qemu:arg value='device.net0.page-per-vq=on'/> > <qemu:arg value='-set'/> > <qemu:arg value='device.net0.host_mtu=8942'/> > </qemu:commandline> > </domain> > > > Regards, > Waleed Mousa > Software Engineer, > Nvidia <https://www.nvidia.com/en-me/geforce/> >
