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Xen - Hardware-assisted virtualization, allowing for unmodified guests
The wikipedia page says Xen has HW virtualization for Intel and AMD CPU's.
Q: Does Xen supports HW virtualization on Power architecture?
ps.: regarding: IBM and Linux: The next billion dollars
No, Xen does not support Power architecture. Quoting http://wiki.xen.org/wiki/Xen_FAQ_Compatibility#Which_architectures_does_Xen_Project_support.3F
Xen Project currently runs on the x86, x86_64 and ARM architectures. As of Xen 4.3 Xen requires at least x86 64-bit for the hypervisor. Xen used to be supported on IA64 (Itanium) but that support was dropped as of Xen 4.2 and Linux v3.14. On x86 Xen Project requires a "P6" or newer processor (that's any Intel or AMD x86 CPU purchased in the last seven years). Multiprocessor and multicore machines are supported, including support for Hyper-Threading (SMT). Support for x86/64 is available since Xen 3.0. We hope to add other architectures such as PPC.
