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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>
master
Dong Jia Shi 2016-09-22 10:36:39 +02:00 committed by Christian Borntraeger
parent f9530c3242
commit 9c9f5f311a
1 changed files with 2 additions and 1 deletions
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3
pc-bios/s390-ccw/virtio.c
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@ -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 */