bridge ports lo (kvm)

Want to use KVM, so setting up bridging.

current, using *wifi*:

thufir@dur:~$ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

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says to make it look like:

#auto eth0
#iface eth0 inet dhcp

auto br0
iface br0 inet dhcp
bridge_ports eth0
bridge_stp off
bridge_fd 0
bridge_maxwait 0

so I want like:

auto br0
iface lo inet loopback
bridge ports ????????

what goes there? "bridge ports lo"? That looks suspect.

pointers appreciated.