Virtualization Technology Overview

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What is the key concept of VMware's technology?

Full Virtualization

How does VMware implement full virtualization in a desktop environment?

Through a type-II hypervisor

What technology enables full virtualization in VMware?

Binary Translation

What is the role of Domain 0 in virtualization?

Domain 0 acts as the privileged domain controlling access to physical hardware. Signup and view all the answers

How does Xen achieve virtualization if components of Windows are not compatible?

Through paravirtualization Signup and view all the answers

What is the purpose of the Shared Virtual Machine Manager (VMM) in virtualization?

To manage multiple virtual machine instances efficiently Signup and view all the answers

What is the role of Domain 0 in a Xen-based system?

Domain 0 has privileged access to the host, runs control software, and handles all other guest operating systems. Signup and view all the answers

Explain the significance of the shared virtual machine manager (VMM) in a Cloud computing system.

The shared VMM is essential for delivering Infrastructure-as-a-Service (IaaS) solutions in a Cloud computing system. Signup and view all the answers

What are the four security levels (rings) in x86 implementations and their significance?

Rings 0, 1, 2, and 3. Ring 0 has the most privilege while Ring 3 has the least. Signup and view all the answers

How does Xen leverage paravirtualization in its operation?

Xen implements paravirtualization to control the Application Binary Interface (ABI) unchanged. Signup and view all the answers

Explain the concept of virtual machine instances in a Xen-based system.

Virtual machine instances are represented as domains running between the Xen hypervisor and Domain 0. Signup and view all the answers

Why is Domain 0 the only domain loaded once the virtual machine manager has fully booted?

Domain 0 hosts an HTTP server that handles requests for virtual machine creation, configuration, and termination. Signup and view all the answers

What is the purpose of hypercalls in a virtualized environment?

Hypercalls are used to catch the execution of sensitive instructions, manage them, and return control to the guest OS. Signup and view all the answers

How does Paravirtualization differ from hardware-assisted virtualization in terms of modifying OS codebase?

Paravirtualization requires changing the OS codebase, making it unsuitable for all operating systems, while hardware-assisted virtualization does not demand such modifications. Signup and view all the answers

Explain the limitation of Xen in terms of legacy hardware and OS.

Xen shows limitations with legacy hardware and OS as they cannot be easily modified to run in Ring 1, a more privileged mode than Ring 0. Signup and view all the answers

What happens when code execution in Ring 3 switches to Ring 0 in x86 implementations?

When code execution switches to Ring 0, it leads to a TRAP or a silent fault, preventing normal operation of the guest OS running in Ring 1. Signup and view all the answers

How does the Xen hypervisor handle sensitive system calls?

The Xen hypervisor uses hypercalls to catch and manage sensitive instructions, then returns control to the guest OS through a supplied handler. Signup and view all the answers

Why are all operating systems not referred to as guest OS in a Xen-based environment?

Not all operating systems can be considered guest OS in Xen due to the requirement of modifying the OS codebase for paravirtualization support. Signup and view all the answers