[Xen-devel] [PATCH] Add xsave/xrstor support to Xen

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

The attached patch adds the support of xsave/xrstor infrastructure for
x86.
xsave/xrstor manages the existing and future processor extended states
in x86 architecture.

The XSAVE/XRSTOR/XGETBV/XSETBV instructions and the Processor Extended
State are defined in the Intel SDMs:
http://www.intel.com/products/processor/manuals/

The basic ideas of the patch are:
1) enable the xsave/xrstor feature when Xen boots;
2) xsave/xrstor the related processor states (i.e., FPU/MMX, SSE) on
vcpu context switch;
3) with the xsave/xrstor feature enabled, Xen doesn't intercept HVM
vcpu's #NM at all, and Xen still intercepts PV vcpu's #NM and forwards
it into PV vcpu if necessary;
4) xsave/xrstor-aware HVM guest is supported in the patch. 

Signed-off-by: Dexuan Cui <dexuan.cui@xxxxxxxxx>

Attachment: xsave-b.patch
Description: xsave-b.patch

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