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Understanding AMD Virtualization Technology (Resources crucial to …

- - - - Must be managed to enabled to share
        
        a set of physical memory
        
        without let someone override
  - - - Each virtual guest musthave its own storage
        
        Isolation is required
- - - - One machine hosts multiple OS
      - When another OS is needed
        
        Current OS state is saved
        
        The new state is loaded
        
        Must be fast
        
        Occurs very often
- - - - The required pieces are sent to DRAM
        
        Virtual addresses
        
        Translated with a map
        
        Chunks of virtual memory
        are translated to real memory
- - - - Performance hits
  - - - This allowed for a uniqe ASID value
        
        Virtualization was perserved
        
        Performance degradation was voided
  - - - Now guest "physical" memory must
        be mapped to the host physical memory
        
        Shadow Page Tables were created
        
        This is the way VMs are connected
        
        They included comple software
        
        Slowdowns
        
        Virtualized Page Tables
        
        It now resides directly on the CPU