From f5b218ecc8601029d0ed780b1d2930cd6ede73e2 Mon Sep 17 00:00:00 2001 From: Tony Krowiak Date: Mon, 15 Jan 2024 13:54:35 -0500 Subject: [PATCH] s390/vfio-ap: reset queues associated with adapter for queue unbound from driver commit f009cfa466558b7dfe97f167ba1875d6f9ea4c07 upstream. When a queue is unbound from the vfio_ap device driver, if that queue is assigned to a guest's AP configuration, its associated adapter is removed because queues are defined to a guest via a matrix of adapters and domains; so, it is not possible to remove a single queue. If an adapter is removed from the guest's AP configuration, all associated queues must be reset to prevent leaking crypto data should any of them be assigned to a different guest or device driver. The one caveat is that if the queue is being removed because the adapter or domain has been removed from the host's AP configuration, then an attempt to reset the queue will fail with response code 01, AP-queue number not valid; so resetting these queues should be skipped. Acked-by: Halil Pasic Signed-off-by: Tony Krowiak Fixes: 09d31ff78793 ("s390/vfio-ap: hot plug/unplug of AP devices when probed/removed") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240115185441.31526-6-akrowiak@linux.ibm.com Signed-off-by: Alexander Gordeev Signed-off-by: Greg Kroah-Hartman --- drivers/s390/crypto/vfio_ap_ops.c | 76 +++++++++++++++++++++------------------ 1 file changed, 41 insertions(+), 35 deletions(-) diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 82a3511..ba96378 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -936,45 +936,45 @@ static void vfio_ap_mdev_link_adapter(struct ap_matrix_mdev *matrix_mdev, AP_MKQID(apid, apqi)); } +static void collect_queues_to_reset(struct ap_matrix_mdev *matrix_mdev, + unsigned long apid, + struct list_head *qlist) +{ + struct vfio_ap_queue *q; + unsigned long apqi; + + for_each_set_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm, AP_DOMAINS) { + q = vfio_ap_mdev_get_queue(matrix_mdev, AP_MKQID(apid, apqi)); + if (q) + list_add_tail(&q->reset_qnode, qlist); + } +} + +static void reset_queues_for_apid(struct ap_matrix_mdev *matrix_mdev, + unsigned long apid) +{ + struct list_head qlist; + + INIT_LIST_HEAD(&qlist); + collect_queues_to_reset(matrix_mdev, apid, &qlist); + vfio_ap_mdev_reset_qlist(&qlist); +} + static int reset_queues_for_apids(struct ap_matrix_mdev *matrix_mdev, unsigned long *apm_reset) { - struct vfio_ap_queue *q, *tmpq; struct list_head qlist; - unsigned long apid, apqi; - int apqn, ret = 0; + unsigned long apid; if (bitmap_empty(apm_reset, AP_DEVICES)) return 0; INIT_LIST_HEAD(&qlist); - for_each_set_bit_inv(apid, apm_reset, AP_DEVICES) { - for_each_set_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm, - AP_DOMAINS) { - /* - * If the domain is not in the host's AP configuration, - * then resetting it will fail with response code 01 - * (APQN not valid). - */ - if (!test_bit_inv(apqi, - (unsigned long *)matrix_dev->info.aqm)) - continue; - - apqn = AP_MKQID(apid, apqi); - q = vfio_ap_mdev_get_queue(matrix_mdev, apqn); - - if (q) - list_add_tail(&q->reset_qnode, &qlist); - } - } + for_each_set_bit_inv(apid, apm_reset, AP_DEVICES) + collect_queues_to_reset(matrix_mdev, apid, &qlist); - ret = vfio_ap_mdev_reset_qlist(&qlist); - - list_for_each_entry_safe(q, tmpq, &qlist, reset_qnode) - list_del(&q->reset_qnode); - - return ret; + return vfio_ap_mdev_reset_qlist(&qlist); } /** @@ -2200,24 +2200,30 @@ void vfio_ap_mdev_remove_queue(struct ap_device *apdev) matrix_mdev = q->matrix_mdev; if (matrix_mdev) { - vfio_ap_unlink_queue_fr_mdev(q); - apid = AP_QID_CARD(q->apqn); apqi = AP_QID_QUEUE(q->apqn); - - /* - * If the queue is assigned to the guest's APCB, then remove - * the adapter's APID from the APCB and hot it into the guest. - */ + /* 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)) { + /* + * Since the queues are defined via a matrix of adapters + * and domains, it is not possible to hot unplug a + * single queue; so, let's unplug the adapter. + */ clear_bit_inv(apid, matrix_mdev->shadow_apcb.apm); vfio_ap_mdev_update_guest_apcb(matrix_mdev); + reset_queues_for_apid(matrix_mdev, apid); + goto done; } } vfio_ap_mdev_reset_queue(q); flush_work(&q->reset_work); + +done: + if (matrix_mdev) + vfio_ap_unlink_queue_fr_mdev(q); + dev_set_drvdata(&apdev->device, NULL); kfree(q); release_update_locks_for_mdev(matrix_mdev); -- 2.7.4