hw/s390x/ipl: Fix endianness problem with netboot_start_addr

The start address has to be stored in big endian byte order
in the iplb.ccw block for the guest.
Signed-off-by: NThomas Huth <thuth@redhat.com>
Message-Id: <1499268345-12552-1-git-send-email-thuth@redhat.com>
Reviewed-by: NCornelia Huck <cohuck@redhat.com>
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>

hw/s390x/ipl.c

@@ -418,7 +418,7 @@ void s390_ipl_prepare_cpu(S390CPU *cpu)
             error_report_err(err);
             vm_stop(RUN_STATE_INTERNAL_ERROR);
         }
-        ipl->iplb.ccw.netboot_start_addr = ipl->start_addr;
+        ipl->iplb.ccw.netboot_start_addr = cpu_to_be64(ipl->start_addr);
     }
 }