Xen devel - Sep 2009 - [PATCH] vmx: add the support of XSAVE/XRSTOR to VMX guest

XSAVE/XRSTOR manages the existing and future processor extended states on x86
architecture.

The XSAVE/XRSTOR infrastructure is defined in Intel SDMs:
http://www.intel.com/products/processor/manuals/ 

The patch uses the classical CR0.TS based algorithm to manage the states on
context switch.
At present, we know 3 bits in the XFEATURE_ENABLED_MASK: FPU, SSE and YMM.
YMM is defined in Intel AVX Programming Reference:
http://software.intel.com/sites/avx/

One more patch to support hvm guest''s save/restore by defining a  pair
of new
HVM_REGISTER_SAVE_RESTORE save/load handlers will be posted later.

Thanks,
-- Dexuan


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