Let me add one more voice to say, why oh why would you do that to yourself and suffer subpar virtualization when you have world class type 1 virtualization built straight into the kernel. And an incredibly capable UI, around since 2009, in the form of virt-manager?

Why does a virtual machine platform need to add support for different kernel versions? What changes are there in the kernel that affects how it interacts with the virtual hardware?

Just… Use virt manager or if you like me hate it’s UI, gnome boxes. They are different UIs for the same thing. And are both infinitely better than virtualbox.