> full-featured Linux-based hypervisors like KVM or Xen > KVM and Xen have Linux-based versions There is no such thing as a Linux-based Xen. KVM and Xen are f

> full-featured Linux-based hypervisors like KVM or Xen > KVM and Xen have Linux-based versions There is no such thing as a Linux-based Xen. KVM and Xen are fundamentally different in that regard. When you are running Xen, you are not running Linux. If you have a Linux dom0, that is still not Linux-based Xen. That is a control domain (a VM) where the management toolstack is installed. It's also the default driver domain, but you can have stub domains just for drivers too. The point is that there is nothing Linux about the Xen hypervisor, at all. When you see a linux kernel with xen in the name, that isn't because it contains the xen hypervisor - it's because it is a kernel modified to utilize hypercalls, etc.