# clone iPXE
git clone git://git.ipxe.org/ipxe.git
cd ipxe/src
# build ipxe rom
make bin/8086100e.rom # e1000
make bin/virtio-net.rom # virtio
make bin/10ec8139.rom # rtl8139
# now copy into /usr/share/kvm. Backup the old copies first.
cp bin/8086100e.rom /usr/share/kvm/pxe-e1000.rom
cp bin/virtio-net.rom /usr/share/kvm/pxe-virtio.rom
cp bin/10ec8139.rom /usr/share/kvm/pxe-rtl8139.rom