hardware virtualization

hardware virtualization

1. classification

   • full
     • vmm runs in rin g 0
     • guest os is separated from base hardware
     • guest os is not aware of being virtualized
   • para
     • guest os has an idea of being virtualized
     • guest os runs in ring 0
     • does not support unmodified guest os
   • hardware assisted
     • achieved using hypervisor aware cpu
     • reduces virtualization overhead caused due to full virtualization
     • cpu and memory virtuialization support is provided.

2. Requirements

3. Ring layers

   • 0
     • most privileged layer
   • 1
   • 2
   • 3
     • used to execute user applications