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End Chapter 7 Tanenbaum Bo, Modern Operating Systems:4th ed., (c) 2013 Prentice-Hall, Inc. All rights reserved. Tanenbaum Bo, Modern Operating Systems:4th ed., (c) 2013 Prentice-Hall, Inc. All rights reserved. Tanenbaum Bo, Modern Operating Systems:4th ed., (c) 2013 Prentice-Hall, Inc. All rights reserved. Virtualization and the Cloud Chapter 7 Tanenbaum Bo, Modern Operating Systems:4th ed., (c) 2013 Prentice-Hall, Inc. All rights reserved. Requirements for Virtualization Hypervisors should score well in three dimensions: Safety: hypervisor should have full control of virtualized resources. Fidelity: behavior of a program on a virtual machine should be identical to same program running on bare hardware. Efficiency: much of code in virtual machine should run without intervention by hypervisor. Tanenbaum Bo, Modern Operating Systems:4th ed., (c) 2013 Prentice-Hall, Inc. All rights reserved. Type 1 and Type 2 Hypervisors (1) Figure 7-1. Location of type 1 and type 2 hypervisors. Tanenbaum Bo, Modern Operating Systems:4th ed., (c) 2013 Prentice-Hall, Inc. All rights reserved. Type 1 and Type 2 Hypervisors (2) Figure 7-2. Examples of the various combinations of virtualization type and hypervisor. Type 1 hypervisors always run on the bare metal whereas type 2 hypervisors use the services of an existing host operating system. Tanenbaum Bo, Modern Operating Systems:4th ed., (c) 2013 Prentice-Hall, Inc. All rights reserved. Techniques for Efficient Virtualization Figure 7-3. When the operating system in a virtual machine executes a kernel only instruction, it traps to the hypervisor if virtualization technology is present. Tanenbaum Bo, Modern Operating Systems:4th ed., (c) 2013 Prentice-Hall, Inc. All rights reserved. Virtualizing the Unvirtualizable Figure 7-4. The binary translates rewrites the guest operating system running in ring 1, while the hypervisor runs in ring 0 Tanenbaum Bo, Modern Operating Systems:4th ed., (c) 2013 Prentice-Hall, Inc
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