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authorCornelia Huck <cornelia.huck@de.ibm.com>2013-06-04 11:04:47 +0200
committerChristian Borntraeger <borntraeger@de.ibm.com>2014-01-17 13:12:22 +0100
commit19e4735bd7f02bd38db43a8521377b35f236b3b6 (patch)
tree99c2faaeedd26bcc599f86f9e830a2160dfc3620 /drivers
parentKVM: s390: Enable the LPP facility for guests (diff)
downloadlinux-19e4735bd7f02bd38db43a8521377b35f236b3b6.tar.xz
linux-19e4735bd7f02bd38db43a8521377b35f236b3b6.zip
KVM: s390: virtio-ccw: Handle command rejects.
A command reject for a ccw may happen if we run on a host not supporting a certain feature. We want to be able to handle this as special case of command failure, so let's split this off from the generic -EIO error code. Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/s390/kvm/virtio_ccw.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c
index d6297176ab85..0fc584832001 100644
--- a/drivers/s390/kvm/virtio_ccw.c
+++ b/drivers/s390/kvm/virtio_ccw.c
@@ -642,8 +642,15 @@ static void virtio_ccw_int_handler(struct ccw_device *cdev,
(SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
/* OK */
}
- if (irb_is_error(irb))
- vcdev->err = -EIO; /* XXX - use real error */
+ if (irb_is_error(irb)) {
+ /* Command reject? */
+ if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
+ (irb->ecw[0] & SNS0_CMD_REJECT))
+ vcdev->err = -EOPNOTSUPP;
+ else
+ /* Map everything else to -EIO. */
+ vcdev->err = -EIO;
+ }
if (vcdev->curr_io & activity) {
switch (activity) {
case VIRTIO_CCW_DOING_READ_FEAT: