[Xen-devel] [RFC PATCH 0/5] x86: workaround inability to fully restore FPU state

[David Vrabel <david.vrabel@xxxxxxxxxx>]

This series extends the workaround for the inability for some x86 CPUs
to fully restore the FPU exception state (64-bit FIP/FDP and FCS/FDS).

32-bit save/restore is always done for Windows guests and the
toolstack may override the default behaviour.

The first 2 patches add a domctl to get/set numeric parameters.  I was
surprised there wasn't an existing mechanism for this.

This series is RFC since I haven't tested it very much.

David


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