Refuse SIDA memops on guests which are not protected.
For normal guests, the secure instruction data address designation,
which determines the location we access, is not under control of KVM.

Fixes: 19e12277 (KVM: S390: protvirt: Introduce instruction data area bounce buffer)
Signed-off-by: NJanis Schoetterl-Glausch <scgl@linux.ibm.com>
Cc: stable@vger.kernel.org
Signed-off-by: NChristian Borntraeger <borntraeger@linux.ibm.com>