KVM: s390: selftest: Test suppression indication on key prot exception

Check that suppression is not indicated on injection of a key checked
protection exception caused by a memop after it already modified guest
memory, as that violates the definition of suppression.

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Link: https://lore.kernel.org/r/20220512131019.2594948-3-scgl@linux.ibm.com


Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>