Definition : "A hypervisor or virtual machine monitor (VMM) is computer software, firmware or hardware that creates and runs virtual machines".

It must include a signature verification (possibly delegated).

Domain Improvement
Hypervisor-Abstract-1 Complete Hypervisor part (jailhouse / KVM / Xen).

Native or Bare-metal hypervisors

These hypervisors run directly on the host's hardware to control the hardware and to manage guest operating systems. Those are the ones we're interested in.