[CentOS] Virtualization supporting 1000Mbps nics?

I've got xen-3.0.3-105.el5_5.5 running on Centos 5.5 and all is running smooth but I notice that any VMs running under it only have access to Realtek RTL8139C at 100 Mbps nics.
We have 4 x 1G nics configured in a port channel so I'd really like to be able to give my VMs 1000Mbps nics.
Does anyone know if this is possible and how to do it?
If not, does KVM support faster nics because at this point it would be fairly simple to change.

Thanx,

Russell Smithies

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