libvirt network config on alpine: 'firewall backend' error

Hi - highly appreciate any help/pointers to resolve the issue:

I'm trying to setup network using libvirt (verion 1.2.21) on a dom0 Alpine-xen v3.3.1 running Xen (4.6.0)

(*) have dnsmasq, dbus, ebtables and iptables installed.
(*) service dbus start

(*) I'm using the sample 'default' network config: cat libvirt_default_network.xml

<network>
  <name>default</name>
  <bridge name="virbr0"/>
  <forward/>
  <ip address="192.168.122.1" netmask="255.255.255.0">
    <dhcp>
      <range start="192.168.122.2" end="192.168.122.254"/>
    </dhcp>
  </ip>
</network>

How to I go about setting up networks under libvirt? Alpine does not have firewalld package (apk search firewalld gives zlich).

Also, here's the list of libvirt packages installed in the dom0 alpine:
~# apk info | grep -i 'virt'
libvirt
libvirt-client
libvirt-daemon
libvirt-common-drivers
libvirt-xen