Privileged Guest OS

The notion of privileged guest OS means that guest OS is allowed to read and write to the SCRATCH_SECURE_RSV109_SCRATCH_0 register. The request to read and write to the scratch register is sent to Hypervisor and Hypervisor in turn reads and writes to the physical scratch register. Privileged guest OS also has the ability to trigger a system reset. Hypervisor receives the system reset request and prepares the system for reboot.