On 9/13/22 10:07 AM, Halil Pasic wrote:
On Tue, 23 Aug 2022 11:06:43 -0400
Tony Krowiak <akrowiak@xxxxxxxxxxxxx> wrote:
The vfio_ap_mdev_unlink_adapter and vfio_ap_mdev_unlink_domain functions
add the associated vfio_ap_queue objects to the hashtable that links them
to the matrix mdev to which their APQN is assigned. In order to unlink
them, they must be deleted from the hashtable; if not, they will continue
to be reset whenever userspace closes the mdev fd or removes the mdev.
This patch fixes that issue.
I'm not so sure about that!
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 70aeefe574cb ("s390/vfio-ap: reset queues after adapter/domain unassignment")
Reported-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
Signed-off-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
---
drivers/s390/crypto/vfio_ap_ops.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index ee82207b4e60..2493926b5dfb 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -1049,8 +1049,7 @@ static void vfio_ap_mdev_unlink_adapter(struct ap_matrix_mdev *matrix_mdev,
if (q && qtable) {
if (test_bit_inv(apid, matrix_mdev->shadow_apcb.apm) &&
test_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm))
- hash_add(qtable->queues, &q->mdev_qnode,
- q->apqn);
Careful qtable->queues is not supposed to be the same as
matrix_mdev->qtable.queues it is rather a function local
qtable that you use to know which queues were unlinked and
need resetting.
You are correct. This patch is unnecessary.
Have a look at vfio_ap_mdev_hot_unplug_adapter()
+ vfio_ap_unlink_queue_fr_mdev(q);
IMHO this change is completely bogous. BTW
vfio_ap_unlink_apqn_fr_mdev() a couple of lines above in the source
(not seen in diff context) calls vfio_ap_unlink_queue_fr_mdev().
After further review, this patch is not only bogus, it is not necessary.
}
}
}
@@ -1236,8 +1235,7 @@ static void vfio_ap_mdev_unlink_domain(struct ap_matrix_mdev *matrix_mdev,
if (q && qtable) {
if (test_bit_inv(apid, matrix_mdev->shadow_apcb.apm) &&
test_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm))
- hash_add(qtable->queues, &q->mdev_qnode,
- q->apqn);
+ vfio_ap_unlink_queue_fr_mdev(q);
Same as above...
Regards,
Halil
}
}
}
