So you'll do "virsh -c qemu:///system dumpxml rawhide"

<clalance> steved: do "virsh -c qemu:///system dumpxml <dom>"
<clalance> steved: Redirect that to  a file, then hand-edit the file.
<clalance> Then "virsh -c qemu:///system define <newxml>"

<steved> clalance: what comand line do you uses to bring up a guest?
<clalance> steved: Usually "virsh -c qemu:///system start <dom>"
<clalance> (or virt-manager)

virsh -c qemu:///system dumpxml rawhide > /tmp/rahide.xml

--- /tmp/rahide.xml.orig        2007-11-27 09:59:33.000000000 -0500
+++ /tmp/rahide.xml     2007-11-27 10:29:41.000000000 -0500
@@ -21,9 +21,9 @@
       <source dev='/dev/mapper/RawHide-Devel'/>
       <target dev='hda'/>
     </disk>
-    <interface type='network'>
+    <interface type='bridge'>
       <mac address='00:16:3e:64:0d:04'/>
-      <source network='default'/>
+      <source bridge='ovirtbr0'/>
       <target dev='vnet0'/>
     </interface>
     <input type='mouse' bus='ps2'/>


virsh -c qemu:///system define /tmp/rahide.xml

# bring up bridge on host machine:

ifcfg-eth0:
DEVICE=eth0
#BOOTPROTO=dhcp
HWADDR=00:1D:09:29:B2:16
ONBOOT=yes
TYPE=Ethernet
BRIDGE=virtbr0

ifcfg-virtbr0:
DEVICE=virtbr0
BOOTPROTO=dhcp
ONBOOT=yes
TYPE=Bridge


#No virt-manager:
madhat# virsh start Fedora9Server
Domain Fedora9Server started

madhat# virt-viewer Fedora9Server