KVM: s390: Increase permitted SE header size to 1 MiB

Relax the maximum allowed Secure Execution (SE) header size from
8 KiB to 1 MiB. This allows individual secure guest images to run on a
wider range of physical machines.

Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>

Author: steffen-eiden

arch/s390/kvm/kvm-s390.c

@@ -2589,9 +2589,9 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)
 		if (copy_from_user(&parms, argp, sizeof(parms)))
 			break;
 
-		/* Currently restricted to 8KB */
+		/* Currently restricted to 1MiB */
 		r = -EINVAL;
-		if (parms.length > PAGE_SIZE * 2)
+		if (parms.length > SZ_1M)
 			break;
 
 		r = -ENOMEM;