hi,
I try to add 2 VF by "hostdev".
Networks (vnet0, vnet1) with:
 <forward mode='hostdev' managed='yes'>
    <pf dev='eth1'/>
.....

Domain:                 
<interface type="network">
             <source network="vnet0"/>
....
<interface type="network">
             <source network="vnet1"/>
....

virsh create error:
"error: internal error process exited while connecting to monitor: kvm: -device pci-assign,configfd=25,host=01:10.1,id=hostdev0,bus=pci.0,addr=0x4: Duplicate ID 'hostdev0' for device"

I am doing somthing wrong?

My configs:
domain:
<domain xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0" type="kvm">
        <name>one-466</name>
        <vcpu>1</vcpu>
        <memory>1781760</memory>
        <os>
                <type arch="x86_64">hvm</type>
                <boot dev="hd"/>
        </os>
        <devices>
                <emulator>/usr/bin/kvm</emulator>
                <disk type="file" device="disk">
                        <source file="/nebula/nebula/var//datastores/0/466/disk.0"/>
                        <target dev="hda" bus="virtio"/>
                        <driver name="qemu" type="raw" cache="default"/>
                </disk>
                <disk type="file" device="disk">
                        <source file="/nebula/nebula/var//datastores/0/466/disk.1"/>
                        <target dev="vdb" bus="virtio"/>
                        <driver name="qemu" type="raw" cache="default"/>
                </disk>
                <graphics type="vnc" listen="0.0.0.0" port="-1"/>
                <interface type="network">
                        <source network="vnet0"/>
                        <mac address="52:54:0a:b1:48:91"/>
                </interface>
                <interface type="network">
                        <source network="vnet1"/>
                        <mac address="52:54:0a:b1:48:92"/>
                </interface>
        </devices>
        <features>
                <acpi/>
        </features>
        <devices><serial type="pty"><source path="/dev/pts/477"/><target port="0"/></serial><console type="pty" tty="/dev/pts/477"><source path="/dev/pts/477"/><target port="0"/></console></devices>
</domain>


Networks:
cat /etc/libvirt/qemu/networks/vnet0.xml
<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
  virsh net-edit vnet0
or other application using the libvirt API.
-->

<network>
  <name>vnet0</name>
  <uuid>1b6a3506-d9e0-4e1e-bbff-6f700b8dc80b</uuid>
  <forward mode='hostdev' managed='yes'>
    <pf dev='eth0'/>
  </forward>
</network>

cat /etc/libvirt/qemu/networks/vnet1.xml
<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
  virsh net-edit vnet1
or other application using the libvirt API.
-->

<network>
  <name>vnet1</name>
  <uuid>11feb088-d609-4177-86d7-ac3b9467a3e8</uuid>
  <forward mode='hostdev' managed='yes'>
    <pf dev='eth1'/>
  </forward>
</network>


I wrote libvirt-users mailing list too.

--
Pozdrawiam
Dominik