What is the classification of CPU virtualization technology?

The classification of CPU virtualization technology includes multiple modes such as full virtualization, paravirtualization, software virtualization, and hardware-assisted virtualization. Each of these types represents a different approach to how virtualization can be implemented.

Full virtualization allows the guest operating system to run unmodified because it relies on the hypervisor to intercept and manage all the calls made by the guest to the underlying hardware. This means that the virtualization layer fully emulates the hardware, allowing any OS to operate as if it were on a physical machine.

Paravirtualization, on the other hand, requires the guest operating system to be modified to be aware of the hypervisor. This approach can lead to better performance as the guest OS can make direct calls to the hypervisor, reducing overhead.

Software virtualization refers to virtualization achieved primarily through software methods, which may not provide the same level of performance as hardware-based solutions, but it can be easier to implement on systems with less hardware support for virtualization.

Hardware-assisted virtualization leverages specific processor features (such as Intel VT-x or AMD-V) that provide direct support for virtualization in the hardware itself. This can improve performance and simplify the hypervisor’s task.

Thus, the choice that encompasses the comprehensive classifications and different methods of CPU virtualization technology is