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[PATCH] s390-bios: Skip writing iplb location to low core for ccw ipl

From: Christian Borntraeger
Subject: [PATCH] s390-bios: Skip writing iplb location to low core for ccw ipl
Date: Fri, 30 Oct 2020 13:28:23 +0100

From: "Jason J. Herne" <jjherne@linux.ibm.com>

The architecture states that the iplb location is only written to low
core for list directed ipl and not for traditional ccw ipl. If we don't
skip this then operating systems that load by reading into low core
memory may fail to start.

We should also not write the iplb pointer for network boot as it might
overwrite content that we got via network.

Signed-off-by: Jason J. Herne <jjherne@linux.ibm.com>
Fixes: 9bfc04f9ef68 ("pc-bios: s390x: Save iplb location in lowcore")
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
 pc-bios/s390-ccw/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index 43c792cf9509..fc4bfaa45529 100644
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -43,7 +43,9 @@ void write_subsystem_identification(void)
 void write_iplb_location(void)
-    lowcore->ptr_iplb = ptr2u32(&iplb);
+    if (cutype == CU_TYPE_VIRTIO && virtio_get_device_type() != VIRTIO_ID_NET) 
+        lowcore->ptr_iplb = ptr2u32(&iplb);
+    }
 unsigned int get_loadparm_index(void)

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