The Qemu Guest Agent permits access to a VM via a virtual serial socket. This has the advantage that the VM can be accessed via the VM node (hypervisor) without network connection or remote desktop protocol.
Libvirt
The XML must be amended by the following XML snippet in the devices section:
<channel type="unix"> <source mode="bind"/> <target type="virtio" name="org.qemu.guest_agent.0"/> </channel>