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Virtual Machines (Types (Type 0 hypervisor (Loaded directly into the…

- - - - hardware protection
- - - - The VMM maintains parameters to determine how much memory it requires
  - - - Operating systems are used to having dynamic I/O devices and provide abstract interfaces which third-parties use
  - - - Can either create physical or virtual partitions
      - Disk images
      - types of mechanisms
        
        Physical to virtual
        
        Virtual to physical
  - - - 1- source VMM establishes a connection
      - 2-The target creates a new guest
      - 3- All read-only pages are sent to target
      - 4- All read-write pages are sent
      - 5-Source repeats step 4
      - 6- when the cycle becomes short it is over
- - - - user
      - kernel
    - - a trap is created
        
        the VM gains control of the machine
    - - Priviledge instructions require overhead
  - - - translation is required
    - - VCPU in user mode
        
        instructions run natively
      - VCPU kernel mode
        
        Privileged instructions are emulated
    - - Each OS maintains tables to translate physical to virtual memory
- - - - base of the Virtual os
    - - provides interface for VMs to run
      - Three types
        
        Hardware based
        
        Software based
        
        Running on OS
    - - Gets virtual copy of host
  - - - Copy of the state of a guest
  - - - A host's resources can be used by many guests
      - Easier maintenance of physical servers
    - - An image is configured to a state which saves installation work
    - - Switching physical servers seamlessly
- - - - Type 2 hypervisor