Thanks for the update on this, Norman.
I was just browsing around and while Virtualbox is good, I have also found that Bhyve, the single userspace instance VMM that runs on FreeBSD and which has been ported over to the Illumos-based SmartOS, OmniOS, and Openindiana is supposed to be much smaller, more optimized, and faster from what I understand. Actually SmartOS is even phasing out their KVM+QEMU approach for Bhyve as well as macOS has a project called Xhyve that is an initial port of Bhyve which only supposed to have a very small dependency on the macOS Hypervisor.Framework and als runs in userspace.
It just made me want to ask if Genode was also looking into it as well.
Just my small input on things.
Cheers,
Lonnie