hardware virtualisation

hardware virtualisation

1. The basic idea of the technology is to consolidate many small physical servers into one large physical server so that the processor can be used more effectively

2. Paravirtualization

   • similar to underlying hardware–software interface
   • provides hooks'
   • simple vmm
   • reduces the overall performance degradation
   • modified kernel

3. Full Virtualization

   • running in ring 0 of the CPU.
   • provides CPU emulation
   • requires both time and system resources

4. Hardware Assisted Virtualization

   • run unmodified guest virtual machines
   • no overheads
   • Dynamic Recompilation

5. Ring Layers

   • Ring 0/ Kernel
     • unrestricted access to the underlying hardware.
     • lowest-level functions of the OS
   • Ring 1
     • device drivers
   • Ring 2
     • device drivers
   • Ring 3
     • application

6. Features

   • Increased Security
   • Managed Execution
   • Sharing
   • Isolation
   • Portability
   • Managed Execution