Abstract: An example non-transitory machine-readable medium includes instructions that cause a processor of a computing device to create a first virtual machine using a hypervisor, execute a trusted basic input/output system (BIOS) in the first virtual machine, create a second virtual machine using the hypervisor, and execute an untrusted BIOS component in the second virtual machine. The first virtual machine is executed with a greater privilege to access a resource of the computing device than the second virtual machine.

Abstract: Approaches for performing nested virtualization using a hypervisor which does not support nested virtualization. A first hypervisor is loaded upon booting a computing device. The first hypervisor instantiates a first virtual machine, exposes an emulated hardware virtualization support interface to the first virtual machine, and executes a second hypervisor, which does not support nested virtualization, within the first virtual machine. The first hypervisor provides nested virtualization support to the second hypervisor to allow the second hypervisor to execute a third hypervisor within a second virtual machine by the first hypervisor abstracting hardware virtualization support to the third hypervisor.