KVM: s390: mark sie block as 512 byte aligned

The sie block must be aligned to 512 bytes. Mark it as such.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>

arch/s390/include/asm/kvm_host.h

@@ -344,7 +344,7 @@ struct kvm_s390_sie_block {
 	__u64	itdba;			/* 0x01e8 */
 	__u64   riccbd;			/* 0x01f0 */
 	__u64	gvrd;			/* 0x01f8 */
-} __attribute__((packed));
+} __packed __aligned(512);
 
 struct kvm_s390_itdb {
 	__u8	data[256];