Re: [Xen-devel] [PATCH] Add XSAVE/XRSTOR support to Xen

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

>>> "Cui, Dexuan" <dexuan.cui@xxxxxxxxx> 26.11.08 10:43 >>>
>The attached patch adds the support of XSAVE/XRSTOR infrastructure for x86.
>XSAVE/XRSTOR manages the existing and future processor extended states on x86 
>architecture.
>
>XSAVE/XRSTOR related stuff is defined in Intel SDMs (The latest version is 
>Nov. 2008):
>http://www.intel.com/products/processor/manuals/ 
>
>The patch uses the classical CR0.TS based lazy algorithm.
>For now only FPU/SSE states (The bit 0 and 1 of XCR0) is supported.
>
>Signed-off-by: Dexuan Cui <dexuan.cui@xxxxxxxxx>

I have to admit that I can't see how save/restore is being taken care of.
After all, the extra state logically would require vcpu_guest_context to
be extended, but as that's not possible, an alternative solution must be
provided.

Jan


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