> No need for using <qemu:commandline/> as this is well configurable via
> domain XML (for ~3 years):
> https://libvirt.org/formatdomain.html#smbios-system-information
> <sysinfo type='fwcfg'>
>    <entry name='opt/com.example/name'>example value</entry>
>    <entry name='opt/com.coreos/config' file='/tmp/provision.ign'/>
> </sysinfo>
> Michal
this gets more neat every minute one learns more of libvirt.
So, I'd take this chance and ask - can we pass paramas to
the kernel, like APPEND?
I'm thinking.. would be great co have net ifaces configured
that(some) way.

When you use direct kernel boot, yes: https://libvirt.org/formatdomain.html#direct-kernel-boot