Try running "unmodified" Windows that you built with ARCH=um :-)
The whole point of full virtualization is that you run unmodified binaries, whether it's Linux, QNX, OS/2 or CP/M. I heard that Linux compiled to run in Xen would run faster than Linux built to run on raw hardware. So you really care about full virtualizaion if you cannot or don't want to recompile anything.
It's amazing that it took so many years to support IA-32 virtualization. The 16-bit virtual machine support appeared in Intel 80386 in 1986 - twenty years ago.
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