Which of the following descriptions about I/O virtualization are correct? (Multiple choice)

Question

Options

• AHardware-assisted virtualization installs the V/O device driver directly in the operating system of
• BBoth virtualization and paravirtualization I/O access processing need to be intervened by
• CParavirtualization simulates a virtual I/O device similar to a real device for a virtual machine
• DThe full virtualization method requires each virtual machine to run the front-end driver. When it

• A
  77% (20)
• C
  15% (4)
• D
  8% (2)

Explanation

A and B are correct because hardware-assisted virtualization (e.g., using IOMMU/VT-d) allows the guest OS to install the I/O device driver directly - bypassing the need for driver emulation - while both full virtualization and paravirtualization still require the hypervisor (VMM) to intercept and process I/O requests to maintain isolation and control.

C is wrong because it describes full virtualization, not paravirtualization. Full virtualization emulates a virtual device that mimics real hardware so the unmodified guest OS can use standard drivers. Paravirtualization instead uses synthetic, hypervisor-aware drivers that don't pretend to be real hardware.

D is wrong because the front-end/back-end (split driver) model belongs to paravirtualization (classic in Xen-style systems), not full virtualization. In full virtualization, the guest uses unmodified standard drivers against an emulated device.

Memory tip: Use the phrase "Full = Fake, Para = Partners, Hardware = Direct." Full virtualization fakes real hardware; paravirtualization uses a partner (front-end/back-end split driver) model; hardware-assisted virtualization gives direct driver access to the guest OS.

No community discussion yet for this question.