📝 Emulation

📖 From Operating System • 16. Virtual Machines • 10 questions available

Practice MCQs for Emulation. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-27

Easy Questions

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📝 Sample Questions

Q1. What does the term VCPU represent in virtualization?

🔹 A. A data structure that holds the virtual CPU's register state.

🔹 B. The physical CPU allocated to a guest.

🔹 C. A hypervisor's scheduling algorithm.

🔹 D. The emulated memory region for I/O.

💡 Difficulty: easy | ✅ Correct: A

Q2. A guest OS attempts to execute the privileged instruction `HLT`. Which action does the VMM take first?

🔹 A. It emulates the instruction and updates the VCPU state.

🔹 B. It traps the instruction and switches to the VMM handler.

🔹 C. It ignores the instruction and continues guest execution.

🔹 D. It shuts down the guest VM immediately.

💡 Difficulty: medium | ✅ Correct: B

Q3. In a nested‑virtualization scenario, a guest VMM runs inside a parent VM. Which mechanism ensures that the innermost guest’s CPU state is correctly restored after a double trap?

🔹 A. Saving the state to disk after each trap.

🔹 B. Stacking VCPU structures and using a two‑level trap handler.

🔹 C. Flushing the TLB on every context switch.

🔹 D. Re‑executing the last instruction in the innermost guest.

💡 Difficulty: hard | ✅ Correct: B

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🔗 Related Topics

📝 Overview Virtual Machines 📝 History Virtual Machines 📝 Benefits and Features Virtual Machines 📝 Building Blocks in Virtual Machines 📝 Trap and emulate in Building Blocks

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