OpenNebula

Hi all,
it appears to me there's a bug in LibVirtDriverKVM.cc in the way that a defined bus type for a disk is not written to the deployment file.
I am using opennebula-3.6 on debian stable with current backports for linux-image, libvirt and qemu-kvm. I cannot persuade opennebula to use the virtio driver for any image. Adding bus="virtio" to the template does not render the deployment file containing such an attribute.
A look into LibVirtDriverKVM.cc show that there is a string bus defined in the head in the disk attributes section, but is later on used in the input section exclusively.

some version strings:
opennebula 3.6.0-1
qemu-kvm 1.0+dfsg-8~bpo60+1
libvirt-bin 0.9.12-3~bpo60+1
linux-image-3.2.0-0.bpo.2-amd64 3.2.20-1~bpo60+1

My template in sunstone looks like this:

CPU="1"
DISK=[
BUS="virtio",
IMAGE="Copy of Debian Squeeze - kvm",
IMAGE_UNAME="oneadmin" ]
GRAPHICS=[
TYPE="vnc" ]
MEMORY="512"
NAME="virtio"
OS=[
ARCH="x86_64",
BOOT="hd" ]
RAW=[
TYPE="kvm" ]
TEMPLATE_ID="11"
VCPU="1"

My resulting deployment file looks like this though:
<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
<name>one-19</name>
<vcpu>1</vcpu>
<memory>524288</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='/var/lib/one//datastores/0/19/disk.0'/>
<target dev='hda'/>
<driver name='qemu' type='raw' cache='default'/>
</disk>
<graphics type='vnc' port='5919'/>
</devices>
<features>
<acpi/>
</features>

</domain>

No bus='virtio'...Am I missing something here?

Cheers,
Chris