diff options
| author | Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> | 2016-09-22 10:36:39 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2016-09-28 13:24:51 +0200 |
| commit | 9c9f5f311a4b391c2dba57cf06b63d62b790e891 (patch) | |
| tree | cec0f393587b48495c3ee30e0bae230ca2ba9d78 /pc-bios/s390-ccw | |
| parent | f9530c32420fff941b7bc8bb5d90310eecab5a96 (diff) | |
pc-bios/s390-ccw: enable subchannel for IPL I/O devices
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 <alifm@linux.vnet.ibm.com>
Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Signed-off-by: Halil Pasic <pasic@linux.vnet.ibm.com>
[remove superfluous flag]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'pc-bios/s390-ccw')
| -rw-r--r-- | pc-bios/s390-ccw/virtio.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c index 1d34e8c1aa..b333734955 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 */ |