Summary Emulation in Virtual machines

Emulation

 In emulation, the virtual machine simulates
hardware, so it can be independent of the
underlying system hardware.

 A guest operating system using emulation does not
need to be modified in any way.

Advantages:

 Widest hardware compatibility

 More portable applications/images

Disadvantages:

 Worst user experience. Too much overhead of
running customized applications, graphics etc

 Worst performance.

, Paravirtualization

 It requires the host OS provide a virtual
machine interface for the guest OS. The
guest access hardware through that host
VM.
 An OS running as a guest on a
paravirtualization system must be
ported/modified to work with the host
interface.

Advantages:

 Good image portability