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Add documentation explaining the execute_only_key. The reservation and initialization mask details are also explained in this patch. No functional change in this patch. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200709032946.881753-7-aneesh.kumar@linux.ibm.com