I've just submitted a patch to upstream Xen which will be of interest to
rumprun users who want to run "rumprun -i" non-interactively, ie. without
stdin and piping stdout to eg. logger. This also allows you to trivially
run a rumprun unokernel as a systemd service.
I'm including the patch here, it's very non-intrusive and if you want to try
it out on an Xen setup it is sufficient to rebuild only the "xenconsole"
binary from source and replace it on your system.
I also have a version for Xen 4.4.1 (in Debian jessie) should someone want