This would be useful for anyone who needs to run bleeding edge linux kernels. Most other hypervisors have poor support when you're pinned to testing distros (For security reasons). KVM and virt-manager are uh not exactly user friendly, so being able to use the KVM backend and always be compatible with the new kernels while having the UX and UI of vbox is actually a very huge deal. This is one of the main reasons I really really hope you all manage to upstream this.

I built and tried this, it worked great, so excellent work there. I found the processor CPU core counts being grayed out unpleasant, it's not clear to me how I am supposed to adjust my core and ram values now, maybe document this?