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According to the architecture, SET PREFIX must try to access the new prefix area and recognize an addressing exception if the area is not accessible. For qemu this check prevents a crash in cpu_map_lowcore after an inaccessible prefix area has been set. Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com> Message-Id: <20220630094340.3646279-1-scgl@linux.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>