s390x/ipl: Remove redundant usage of gr7

We don't need to pass device address for pc-bios using gr7 anymore as
the pcbios completely relies on diag308 now, so we can remove it from
qemu. devno, ssid and cssid are migrated but the value was never reused,
so we can safely ignore these fields and migrate 0.
Signed-off-by: NAlexander Yarygin <yarygin@linux.vnet.ibm.com>
Reviewed-by: NDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>

hw/s390x/ipl.c

@@ -208,50 +208,27 @@ static Property s390_ipl_properties[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
-/*
- * In addition to updating the iplstate, this function returns:
- * - 0 if system was ipled with external kernel
- * - -1 if no valid boot device was found
- * - ccw id of the boot device otherwise
- */
-static uint64_t s390_update_iplstate(S390IPLState *ipl)
+static bool s390_gen_initial_iplb(S390IPLState *ipl)
 {
     DeviceState *dev_st;
 
-    if (ipl->iplb_valid) {
-        ipl->cssid = 0;
-        ipl->ssid = 0;
-        ipl->devno = ipl->iplb.devno;
-        goto out;
-    }
-
-    if (ipl->kernel) {
-        return 0;
-    }
-
     dev_st = get_boot_device(0);
     if (dev_st) {
         VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
             OBJECT(qdev_get_parent_bus(dev_st)->parent),
                 TYPE_VIRTIO_CCW_DEVICE);
         if (ccw_dev) {
-            ipl->cssid = ccw_dev->sch->cssid;
-            ipl->ssid = ccw_dev->sch->ssid;
-            ipl->devno = ccw_dev->sch->devno;
             ipl->iplb.len = cpu_to_be32(S390_IPLB_MIN_CCW_LEN);
             ipl->iplb.blk0_len =
                 cpu_to_be32(S390_IPLB_MIN_CCW_LEN - S390_IPLB_HEADER_LEN);
             ipl->iplb.pbt = S390_IPL_TYPE_CCW;
             ipl->iplb.ccw.devno = cpu_to_be16(ccw_dev->sch->devno);
             ipl->iplb.ccw.ssid = ccw_dev->sch->ssid & 3;
-            ipl->iplb_valid = true;
-            goto out;
+            return true;
         }
     }
 
-    return -1;
-out:
-    return (uint32_t) (ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno);
+    return false;
 }
 
 void s390_ipl_update_diag308(IplParameterBlock *iplb)
@@ -289,7 +266,9 @@ void s390_ipl_prepare_cpu(S390CPU *cpu)
 
     if (!ipl->kernel || ipl->iplb_valid) {
         cpu->env.psw.addr = ipl->bios_start_addr;
-        cpu->env.regs[7] = s390_update_iplstate(ipl);
+        if (!ipl->iplb_valid) {
+            ipl->iplb_valid = s390_gen_initial_iplb(ipl);
+        }
     }
 }