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I think you could also add Xen to that list. IIRC, the old Xen PV mode was purely paravirtualized without using any hardware extensions.

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Yes, Xen was big on paravirtualisation but started supporting the other kinds pretty soon, too. (At least they were supported around 2009-2012, when I was working on XenServer.)

I think things are swinging back the other way if I have understood the more recent PVHv2 stuff correctly.

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