Question2 2. Virtualization offers many benefits, which explains its recent popu

Question

Question2 2. Virtualization offers many benefits, which explains its recent popularity. Assume a Type 1 (hostless) virtual machine monitor (VM M) that supports virtual machines. Answer f the following statements are true or false. Explain your answer. (25 pts., 5 pts. for each part) a. A Type I VMM based virtualization system cannot use paravirtualization. b. With the Intel virtualization (VT-x) extensions, host OS can run in ring 0 as it does in a non-virtualized environment. c. Prior to the changes that were made by VT-x, the x-86 SGDT instruction was privileged and its execution trapped to ring 0. d. Xen allows guest operating systems to both read and update page tables without involving the hypervisor. e. It is easier to ensure correctness of a hypervisor compared to a full operating system.

Explanation / Answer

1) False, Type I Virtual Machine Monitor based virtualization system uses paravirtualization as paravirtualization is used by the machines to replace ineffcient operation with the efficient one, however paravirtualization effects the guest Operating System in which it is running.

2) True, With the Intel Virtualization (VT-x) extensions, host OS can run in ring0 as it does in a non-virtualized environment. host OS run System calls and traps,interupts in ring level 0 as it does in non-virtualized environment.

3) True, Prior to the changes that were made by VT-x, the x-86 SGDT instruction was privileged and its execution trapped to ring 0 ,

4) True, Xen allows guest operating System to both read and update page tables without involving the hypervisor as each VM receives a fixed allocation of page frames that can be used , also New page tables are registered with Xen.  

5) False, correctness of a hypervisor itself requires several major components, following the 4 things major components
i)  the implemention of a large numbers of ’C + macro assembly + assembly’ threads on a multi-core processor with a fixed small number of cores,
   ii) the correctness of Parallel shadow page table algorithm is required in for the host hardware whose MMUs do not support two levels of translations.
   iii) TM type simulation theroms.
   iv) correct implements of system calls is also required.

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