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

[Cornelia Huck <cohuck@redhat.com>]

On Fri, 17 Nov 2017 19:10:28 +0100
Thomas Huth <thuth@redhat.com> wrote:

> 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;

Thanks, applied + rebuilt the bios and pushed to s390-fixes.