Hardware Virtualization

Hardware Virtualization

1. x86 architecture

2. full

   • the virtual machine simulates enough hardware to allow an unmodified "guest" OS designed for the same instruction set to be run in isolation

3. para

   • the virtual machine does not necessarily simulate hardware, but instead (or in addition) offers a special API that can only be used by modifying[clarification needed] the "guest" OS. For this to be possible, the "guest" OS's source code must be available

4. hardware assisted

   • the hardware provides architectural support that facilitates building a virtual machine monitor and allows guest OSs to be run in isolation

5. x86 without virtualization

6. Performance

   • Good
   • Better in certain cases
   • Fair

7. Used by

   • VMWare, microsoft, parallels
   • VMWare , XEN
   • VMWare, Microsoft, XEN

8. Technique

   • Binary translation and direct execution
   • Hypercalls
   • Exit to root modes on privileged instructions

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