"Ring Compression" – how Virtual PC works today

Although the most interesting bits are arguably down the road with the hypervisor approaches, I found the description of how the current code pushes the guest kernel up to Ring 1 very interesting.




We always say there’s a whole bunch of code in the VMM that takes the guest kernel and makes it run at Ring 1, and there’s a bunch of code in that thing that fakes it to make it think it’s running at Ring 0 – it basically negates itself.

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