Methods, systems, and computer program products for accessing a protected function are provided. A computer-implemented method includes allocating and initializing a guest virtual address for a virtual machine function. A user bit and a valid bit are configured to protect a page associated with the guest virtual address. Once the user bit and the valid bit are configured, the virtual machine function is mapped to the guest virtual address. Supervisor mode is requested in order to access the virtual machine function. In supervisor mode, the virtual machine function is validated and executed.