[Qemu-devel] [PATCH for-2.11] pc-bios/s390-ccw: Fix problem with invalid virtio-scsi LUN when rebooting

[Thomas Huth <thuth@redhat.com>]

When rebooting a guest that has a virtio-scsi disk, the s390-ccw
bios sometimes bails out with an error message like this:

! SCSI cannot report LUNs: STATUS=02 RSPN=70 KEY=05 CODE=25 QLFR=00, sure !

Enabling the scsi_req* tracing in QEMU shows that the ccw bios is
trying to execute the REPORT LUNS SCSI command with a LUN != 0, and
this causes the SCSI command to fail.
Looks like we neither clear the BSS of the s390-ccw bios during reboot,
nor do we explicitly set the default_scsi_device.lun value to 0, so
this variable can contain random values from the OS after the reboot.
By setting this variable explicitly to 0, the problem is fixed and
the reboots always succeed.

Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1514352
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 pc-bios/s390-ccw/virtio-scsi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pc-bios/s390-ccw/virtio-scsi.c b/pc-bios/s390-ccw/virtio-scsi.c
index c92f5d3..4fe4b9d 100644
--- a/pc-bios/s390-ccw/virtio-scsi.c
+++ b/pc-bios/s390-ccw/virtio-scsi.c
@@ -223,7 +223,8 @@ static void virtio_scsi_locate_device(VDev *vdev)
 
     for (target = 0; target <= vdev->config.scsi.max_target; target++) {
         sdev->channel = channel;
-        sdev->target = target; /* sdev->lun will be 0 here */
+        sdev->target = target;
+        sdev->lun = 0;          /* LUN has to be 0 for REPORT LUNS */
         if (!scsi_report_luns(vdev, data, sizeof(data))) {
             if (resp.response == VIRTIO_SCSI_S_BAD_TARGET) {
                 continue;
-- 
1.8.3.1