VirtualBox only uses Qemu code for certain things. Otherwise, much of the code is still different from whatever else is available.
Here's what I'm really wondering about, at least ever since I read that VMWare's model is to run as many instructions natively as possible. What's the role of CPU VT instructions, then? I thought that CPU VT instructions made this possible, but VMWare has been doing this before the instructions were ever available.
By the way, KVM was listed. I said "Qemu (various combos or not)". Xen is in a class all on its own, which is why it's not appropriate here. I don't think Virtual PC is available for Unix...
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