We're trying to switch libvirt over to using firewalld rather than calling iptables and ebtables directly (firewalld is present in F17, but disabled by default; it will be enabled by default in F18). The interaction with firewalld is through that package's commandline utility, /usr/bin/firewall-cmd.

When we try to call firewall-cmd from libvirtd, we get the following AVC:

type=USER_AVC msg=audit(1345131322.154:3428): pid=0 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { send_msg } for msgtype=method_return dest=:1.256 spid=10350 tpid=11648 scontext=system_u:system_r:firewalld_t:s0 tcontext=system_u:system_r:virtd_t:s0-s0:c0.c1023 tclass=dbus  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'

I've rerun in permissive mode and this is the only AVC that shows up in the audit logs, so hopefully a policy for just this one thing will permit it to run.