s390/vfio-ap: do not reset queue removed from host config

When a queue is unbound from the vfio_ap device driver, it is reset to
ensure its crypto data is not leaked when it is bound to another device
driver. If the queue is unbound due to the fact that the adapter or domain
was removed from the host's AP configuration, then attempting to reset it
will fail with response code 01 (APID not valid) getting returned from the
reset command. Let's ensure that the queue is assigned to the host's
configuration before resetting it.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: "Jason J. Herne" <jjherne@linux.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Fixes: eeb386aeb5b7 ("s390/vfio-ap: handle config changed and scan complete notification")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240115185441.31526-7-akrowiak@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 550c936..983b3b1 100644 (file)
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -2215,10 +2215,10 @@ void vfio_ap_mdev_remove_queue(struct ap_device *apdev)
        q = dev_get_drvdata(&apdev->device);
        get_update_locks_for_queue(q);
        matrix_mdev = q->matrix_mdev;
+       apid = AP_QID_CARD(q->apqn);
+       apqi = AP_QID_QUEUE(q->apqn);
 
        if (matrix_mdev) {
-               apid = AP_QID_CARD(q->apqn);
-               apqi = AP_QID_QUEUE(q->apqn);
                /* If the queue is assigned to the guest's AP configuration */
                if (test_bit_inv(apid, matrix_mdev->shadow_apcb.apm) &&
                    test_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm)) {
@@ -2234,8 +2234,16 @@ void vfio_ap_mdev_remove_queue(struct ap_device *apdev)
                }
        }
 
-       vfio_ap_mdev_reset_queue(q);
-       flush_work(&q->reset_work);
+       /*
+        * If the queue is not in the host's AP configuration, then resetting
+        * it will fail with response code 01, (APQN not valid); so, let's make
+        * sure it is in the host's config.
+        */
+       if (test_bit_inv(apid, (unsigned long *)matrix_dev->info.apm) &&
+           test_bit_inv(apqi, (unsigned long *)matrix_dev->info.aqm)) {
+               vfio_ap_mdev_reset_queue(q);
+               flush_work(&q->reset_work);
+       }
 
 done:
        if (matrix_mdev)