Question

Why does virtualization negatively affect the hardware performance?

Why does virtualization negatively affect the hardware performance? because the trap-and-emulate approach used by VT hardware generates a lot of traps, and traps are very expensive on modern hardware because they ruin CPU caches, TLBs, and branch prediction tables because the hypervisor turns off interrupts for the guest operating system which affects the entire machine because every occurrence of CLI instruction (clear interrupts) is replaced by "VirtualCPU.IF=0", which is a very cheap instruction because we need to add an extra level of page tables to map "guest physical pages

Answer 1

Answer:

Option B is correct.

Explanation:

A hypervisor or virtual machine monitor runs the guest OS directly on the CPU. (This only works if the guest OS uses the same instruction set as the host OS.) Since the guest OS is running in user mode, privileged instructions must be intercepted or replaced.

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