It would be trivial for VirtualBox to use KVM instead of shipping an (out of tree) kernel module that uses the vmx instructions directly. I don't understand wha

It would be trivial for VirtualBox to use KVM instead of shipping an (out of tree) kernel module that uses the vmx instructions directly. I don't understand what exactly is blocking VirtualBox from doing that. They already use HyperV in Windows instead of abusing vmx directly. They could still keep their qemu fork and everything so that the driver compatibility is still top-notch, but at least they would not require out of tree kernel modules, and VirtualBox would also be concurrently usable with other KVM users.