I did a short search in my occasional look at how to convert my Windows 7 in Virtualbox to qcow2 and to virtmanager:qemu.
I found a KVM conference on youtube and this caught my eye.
"Honey I Shrunk the Hypervisor."
https://www.youtube.com/watch?v=JqdPTXxAS6w
New things with a heavy input of code from Intel people seems to take time, at least in the case of connman, but ends up with a strong base.
https://github.com/intel/nemu
Not an option probably for at least a year, (presently it does not even support Windows guests officially) -but for people younger than me looking for a niche in IT, might be good learning opportunity. I am merely a hobbyist.