what is virtualbox paravirtualization interface

Trapping, a means of handling unexpected or unallowable conditions, can be time-consuming and can adversely impact performance in systems that employ full virtualization. Paravirtualization eliminates the need for the virtual machine to trap privileged instructions. The main limitation of paravirtualization is the fact that the guest OS must be tailored specifically to run on top of the virtual machine monitor (VMM), the host program that allows a single computer to support multiple, identical execution environments. This capacity minimizes overhead and optimizes system performance by supporting the use of VMs that would otherwise be underutilized in conventional or full hardware virtualization. With paravirtualization, virtual machines can be accessed through interfaces that are similar to the underlying hardware.

Paravirtualization is an enhancement of virtualization technology in which a guest OS is modified prior to installation inside a virtual machine ( VM) in order to allow all guest OSes within the system to share resources and successfully collaborate, rather than attempt to emulate an entire hardware environment.

What is virtualbox paravirtualization interface