US Patent 10095532 Providing excess compute resources with virtualization

A main operating system interface engine can be configured to receive instructions from a main operating system of one or more host systems and can manage a virtualized operating system on the one or more host systems, the virtualized operating system appearing distinct from the main operating system to a user of the one or more host systems. A virtualization environment management engine can manage a virtualization environment, the virtualization environment using the virtualized operating system. A virtual machine management engine can manage one or more virtual machine instances in the virtualization environment, each of the one or more virtual machine instances operative to provide virtualized resources of the one or more host systems for a compute access system coupled to the one or more host systems.