The POP states that the IPLB location is only written to 0x14 for
list-directed IPL. Some operating systems expect 0x14 to not change on
boot and will fail IPL if it does change.
Fixes: 9bfc04f9ef6802fff0
Signed-off-by: Jason J. Herne <jjhe...@linux.ibm.com>
Reviewed-by: Janosch Frank <fran...@de.ibm.com>
---
pc-bios/s390-ccw/jump2ipl.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/pc-bios/s390-ccw/jump2ipl.c b/pc-bios/s390-ccw/jump2ipl.c
index 767012bf0c..5e3e13f4b0 100644
--- a/pc-bios/s390-ccw/jump2ipl.c
+++ b/pc-bios/s390-ccw/jump2ipl.c
@@ -33,7 +33,10 @@ void jump_to_IPL_code(uint64_t address)
{
/* store the subsystem information _after_ the bootmap was loaded */
write_subsystem_identification();
- write_iplb_location();
+
+ if (iplb.pbt != S390_IPL_TYPE_CCW) {
+ write_iplb_location();
+ }
/* prevent unknown IPL types in the guest */
if (iplb.pbt == S390_IPL_TYPE_QEMU_SCSI) {
--
2.21.1
