2009 Sun 20th Dec VM Isolation

Posted by Scott on 20 December 2009. There are 17 comments.

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Welcome back to the Virtual Monday Minute. Today's topic is Virtual Machine isolation--the ability of a host VMM to present each VM its own view of hardware resources, separate from any other VM. A VMM presents a view of lower-layer resources to the VM or VMs at the layer above. By controlling what resources a guest VM can see, a VMM isolates the VMs from each other. This makes it possible for a VM to function as a single machine, manage its own resources, albeit virtualized, and not worry about resource conflicts with any other VMs hosted by the same VMM. They are isolated from each other and aren't aware that they are sharing hardware with each other. Whether you have 2 VMs or 20 on a single VMM layer, they know only the resources that they are presented, and they aren't aware that they are sharing the same physical hardware at the layer beneath the VMM. This is a very powerful feature of virtualization.

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