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Rahul S Bhalerao

TYIT

110808002

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Virtualization

Hardware

Full Para

Software

OS level Applicationlevel

*Storage,network ,memory and data are not a part of this seminar.

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H ardware VirtualizationO creation of a virtual machine that acts like a

real computer with an operating system.O Full : complete simulation of the actual

hardware to allow softwareO Partial : some but not all of the target

environment is simulated

O Para : no hardware isolation the guestsoftware are executed in their own isolateddomains

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S erver Virtulisation

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Video of load transferO 4 :37 to 5.00

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C hallenges To Virtualization1. OS needs direct access tothe machine at ring 0.

2.Some sensitive instructionscannot be virtualized as theyhave different semantics whenthey are not run in ring 0.

3.Difficuty in trapping andtranslating this sensitive andprivileged instructions

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F ull VirtualisationO U sing binary

translationO OS instructions are

translated and userapplications directlyrun on hardware

O Microsoft VirtualServer

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OS Assisted orParavirtualisation

O Modify the OSO Replace the sensitive

instructions in kernelO Poor PortabilityO Open Source Xen

project using the

linux kernel

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H ardware Assisted Virtualisation

O Intels VirtualizationTechnology

O AMD s AMD-VO Target sensitive

information with newCPU execution mode

feature

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M emory Virtualisation

O Using paging ,virtual memoryO Guest OS does not have direct access to memoryO VMM responsible for mapping OS memory to

phsical memmory

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IO VirtualisationO Managing and

routing I/O request

between guest OSand shared h/w

O Hypervisor virtualizesthe h/w so that eachOS is presented withstandard set of virtual drivers

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AdvantagesO Dynamic Load balancing O Automatic and Manual Load MigrationO High AvailabilityO Resilience

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R efrencesO IBM Virtualisation in Education White PaperO Understanding Full ,Para Virtualization for

x86 VMWareO WikiPediaO YouTube