Lecture 26: Virtual Machines

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Why run several operating systems?

Emulation versus limited direct execution

CPU virtualization: trap and emulate

Worked example: loading the interrupt descriptor table

System calls in the basic model

Hardware assistance and the trapping assumption

Concurrency inside and between guests

Memory virtualization

Shadow paging: compose translations in software

Nested paging: walk both tables in hardware

Device virtualization

Architectures, uses, and isolation

Review questions

Question 1

Question 2

Question 3

Connections and attribution