The idea behind Xen is that full virtualisation is complex and often inefficient - so the obvious solution is for the guest OSes to behave and make the job easy for the virtualisation engine.
This strategy, often called paravirtualisation, is a lot more efficient than full virtualisation, but requires special guest kernels. The rest of the guest operating system can remain unchanged. This is a very promising approach to virtualisation, one that should help a lot of Linux developers by allowing them to efficiently run multiple versions of a distribution on the same system, or help with security separation. I am working on integrating Xen into Fedora and hope it will be a good piece of infrastructure for the Fedora developers.
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