[libvirt-users] VNC display size

Hi I would like to set the resolution of the video device of my domain. So if I connect with via vnc I see more. That is the part of the .xml file: "... <graphics type='vnc' port='-1' autoport='yes'/> <video> <model type='cirrus' vram='9216' heads='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> ..." How can I change it? Salutations Aaron