Spice

Server

apt-get install qemu-kvm-spice 

Client

apt-get install spice-client  spice-client-gtk python-spice-client-gtk

For native client access

change /etc/libvirt/qemu.conf to
spice_listen = "0.0.0.0"

VM config

in /etc/libvirt/qemu/vm.xml  change
<emulator>/usr/bin/kvm</emulator>
to 
<emulator>/usr/bin/kvm-spice</emulator>
an set  
<graphics type='spice' autoport='yes' keymap='de'/>
<video>
     <model type='qxl' vram='65536' heads='1'/>
     <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>

virsh define vm.xml

Links

• http://wiki.centos.org/HowTos/Spice-libvirt