Description of problem:

Bridged networking appears to be setup correctly on the host, but there is
nothing to select for "shared physical device". As a result I cannot complete an
http install w/o a network link to the outside world.

Version-Release number of selected component (if applicable):
$ rpm -qa | egrep 'xen|virt' | sort
kernel-xen-2.6.21.7-2.fc8
libvirt-0.4.0-4.fc8
libvirt-python-0.4.0-4.fc8
python-virtinst-0.300.2-3.fc8
virt-manager-0.5.3-1.fc8
virt-top-0.3.2.8-1.fc8
xen-3.1.2-2.fc8
xen-libs-3.1.2-2.fc8
xenner-0.23-1.fc8


How reproducible:
100%


Additional info:
# brctl show
bridge name     bridge id               STP enabled     interfaces
eth0            8000.0019b9007435       no              peth0
virbr0          8000.000000000000       yes

# ethtool eth0
Settings for eth0:
        Link detected: yes

# ethtool peth0
Settings for peth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: umbg
        Wake-on: g
        Current message level: 0x00000007 (7)
        Link detected: yes