From: Dong Jia Shi <bjsdj...@linux.vnet.ibm.com>
IPL should cause the IPL I/O device to become enabled. So when handling
the IPL program, we should set the E (Enable) bit. However, virtio-ccw
does not know whether it's dealing with an IPL device or not. Since
trying to perform I/O on a disabled device doesn't make any sense,
let's just always enable it. At the same time we can remove the
SCSW_FCTL_START_FUNC flag as it is ignored for msch anyway and did
not enable the device as intended.
Reported-by: Farhan Ali <al...@linux.vnet.ibm.com>
Signed-off-by: Dong Jia Shi <bjsdj...@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.h...@de.ibm.com>
Reviewed-by: Sascha Silbe <si...@linux.vnet.ibm.com>
Signed-off-by: Halil Pasic <pa...@linux.vnet.ibm.com>
[remove superfluous flag]
Signed-off-by: Christian Borntraeger <borntrae...@de.ibm.com>
---
pc-bios/s390-ccw/virtio.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index 1d34e8c..b333734 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -97,7 +97,8 @@ static int run_ccw(VDev *vdev, int cmd, void *ptr, int len)
/* start command processing */
stsch_err(vdev->schid, &schib);
- schib.scsw.ctrl = SCSW_FCTL_START_FUNC;
+ /* enable the subchannel for IPL device */
+ schib.pmcw.ena = 1;
msch(vdev->schid, &schib);
/* start subchannel command */
--
2.5.5
