libvirt users - Sep 2010 - network configuration for ipv6 setup

Hi, I am currently using IPv4 with the following network configuration 
which has worked fine for some months now:

<network>
   <name>net0</name>
   <uuid>fa0c1c69-da82-1bef-fcb2-4c336bbexxxx</uuid>
   <forward dev='eth0' mode='route'/>
   <bridge name='virbr0' stp='on' forwardDelay='0'
/>
   <ip address='78.47.xx.xx' netmask='255.255.255.xxx'>
   </ip>
</network>

The company hosting my server is now providing /64-IPv6-subnets to its 
customers - thus I'd like to take advantage of this and supply my guests 
with IPv6-subnets.

Is it possible to do this without changing much of my setup (i.e. just 
changing some configuration files?)?

I am using libvirt 0.6.3.

Thanks,
Martin