Modern microprocessor architectures have special instructions to aid the virtualization of hardware, enabling the guest OS to execute privileged instructions directly on the processor.

Modern microprocessor architectures have special instructions to aid the virtualization of hardware, enabling the guest OS to execute privileged instructions directly on the processor.

• A. OS Assisted Virtualization
• B. Hardware Assisted Virtualization
• C. Full Virtualization
• D. Sandbox

Answer: (B)

The idea being tested is hardware-assisted virtualization. Modern CPUs include virtualization extensions (like Intel VT-x or AMD-V) that add special instructions and modes to support running a guest operating system with privileged instructions handled safely by the processor. With these features, the hypervisor controls access to hardware resources while the guest OS runs in its own non-privileged or confined mode, and sensitive or privileged instructions trap to the hypervisor to be emulated or managed. This setup lets the guest operate as if it has full control, but actual hardware control remains with the hypervisor, improving performance and isolation compared to purely software-based approaches. OS-assisted virtualization relies on the guest being modified to cooperate with the hypervisor, or on different techniques, while hardware-assisted virtualization provides the hardware support that makes virtualization more efficient and transparent. A sandbox is about containment, not about enabling privileged instruction handling at the processor level for full virtualization.

The idea being tested is hardware-assisted virtualization. Modern CPUs include virtualization extensions (like Intel VT-x or AMD-V) that add special instructions and modes to support running a guest operating system with privileged instructions handled safely by the processor. With these features, the hypervisor controls access to hardware resources while the guest OS runs in its own non-privileged or confined mode, and sensitive or privileged instructions trap to the hypervisor to be emulated or managed. This setup lets the guest operate as if it has full control, but actual hardware control remains with the hypervisor, improving performance and isolation compared to purely software-based approaches. OS-assisted virtualization relies on the guest being modified to cooperate with the hypervisor, or on different techniques, while hardware-assisted virtualization provides the hardware support that makes virtualization more efficient and transparent. A sandbox is about containment, not about enabling privileged instruction handling at the processor level for full virtualization.