http://2013.asiabsdcon.org/papers/abc2013-P5A-paper.pdf: "Intel added unrestricted guest mode on Westmere micro-architecture and later Intel CPUs, it uses EPT to translate guest physical address access to host physical address. With this mode, VMEnter without enable paging is allowed."
First the Tick, Now the Tock: Next Generation Intel Microarchitecture (Nehalem). In: White Paper Intel. Intel (intel.com [PDF; abgerufen am 6. Juli 2008]).