Any idea on how to do this? I've tried creating a custom config:
<disk type='file' device='floppy'>
<source file='/home/solusvm/kvm/driver/virtio-win-0.1-30.iso'/>
<target dev='fda'/>
</disk>
But it Windows Server 2003 doesn't seem to be able to pick up a floppy drive to install the virtio drivers. I'm testing out Windows Server 2012 right now.