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midterm1-practice-questions.md

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To help you prepare for Midterm 1, here are some questions you should be able to answer. If you are unsure about any of the questions, come talk to me during office hours.

Questions

  • What is the difference between para-virtualization and full-hosted virtualization?
  • What hardware support does Intel provide for CPU virtualization?
  • What hardware support does Intel provide for memory virtualization?
  • Does EPT use less memory for page tables than shadow page tables? Why or why not?
  • If you have ten virtual machines each running 20 processes on a single physical machine (assume the host is not running any other application), how many page tables total are allocated in memory?
  • What is the main weakness of paravirtualization? Why is it not employed widely today?
  • When you have nested virtualization, when the L2 VM generates a trap, who handles it: L1 or L0? Why?
  • Lets assume L1 is employing shadow page tables to virtualize L2 memory, and L0 is employing EPT to virtualize L1 memory. What does CR3 point to? What are the two page tables pointed to by the hardware EPT?
  • When using shadow page tables, if the virtual machine is executing 10 applications, and the host OS is executing 20 applications, how many page tables in total are allocated in memory at this point?
  • Why was the x86 instruction set considered not virtualizable? Explain with an example.