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Fri, 21 Aug 2020 19:56:32 +0000 (GMT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 49A9D7805C; Fri, 21 Aug 2020 19:56:31 +0000 (GMT) Received: from cpe-172-100-175-116.stny.res.rr.com.com (unknown [9.85.191.76]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Fri, 21 Aug 2020 19:56:31 +0000 (GMT) From: Tony Krowiak To: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: freude@linux.ibm.com, borntraeger@de.ibm.com, cohuck@redhat.com, mjrosato@linux.ibm.com, pasic@linux.ibm.com, alex.williamson@redhat.com, kwankhede@nvidia.com, fiuczy@linux.ibm.com, frankja@linux.ibm.com, david@redhat.com, imbrenda@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, Tony Krowiak Subject: [PATCH v10 05/16] s390/vfio-ap: implement in-use callback for vfio_ap driver Date: Fri, 21 Aug 2020 15:56:05 -0400 Message-Id: <20200821195616.13554-6-akrowiak@linux.ibm.com> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200821195616.13554-1-akrowiak@linux.ibm.com> References: <20200821195616.13554-1-akrowiak@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-08-21_08:2020-08-21,2020-08-21 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=3 lowpriorityscore=0 impostorscore=0 phishscore=0 priorityscore=1501 clxscore=1015 spamscore=0 mlxlogscore=999 malwarescore=0 bulkscore=0 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008210183 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Let's implement the callback to indicate when an APQN is in use by the vfio_ap device driver. The callback is invoked whenever a change to the apmask or aqmask would result in one or more queue devices being removed from the driver. The vfio_ap device driver will indicate a resource is in use if the APQN of any of the queue devices to be removed are assigned to any of the matrix mdevs under the driver's control. Signed-off-by: Tony Krowiak --- drivers/s390/crypto/vfio_ap_drv.c | 1 + drivers/s390/crypto/vfio_ap_ops.c | 68 ++++++++++++++++++++------- drivers/s390/crypto/vfio_ap_private.h | 2 + 3 files changed, 53 insertions(+), 18 deletions(-) diff --git a/drivers/s390/crypto/vfio_ap_drv.c b/drivers/s390/crypto/vfio_ap_drv.c index 24cdef60039a..aae5b3d8e3fa 100644 --- a/drivers/s390/crypto/vfio_ap_drv.c +++ b/drivers/s390/crypto/vfio_ap_drv.c @@ -175,6 +175,7 @@ static int __init vfio_ap_init(void) memset(&vfio_ap_drv, 0, sizeof(vfio_ap_drv)); vfio_ap_drv.probe = vfio_ap_queue_dev_probe; vfio_ap_drv.remove = vfio_ap_queue_dev_remove; + vfio_ap_drv.in_use = vfio_ap_mdev_resource_in_use; vfio_ap_drv.ids = ap_queue_ids; ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME); diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 2e37ee82e422..fc1aa6f947eb 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -515,18 +515,36 @@ vfio_ap_mdev_verify_queues_reserved_for_apid(struct ap_matrix_mdev *matrix_mdev, return 0; } +#define MDEV_SHARING_ERR "Userspace may not re-assign queue %02lx.%04lx " \ + "already assigned to %s" + +static void vfio_ap_mdev_log_sharing_err(const char *mdev_name, + unsigned long *apm, + unsigned long *aqm) +{ + unsigned long apid, apqi; + + for_each_set_bit_inv(apid, apm, AP_DEVICES) + for_each_set_bit_inv(apqi, aqm, AP_DOMAINS) + pr_err(MDEV_SHARING_ERR, apid, apqi, mdev_name); +} + /** * vfio_ap_mdev_verify_no_sharing * * Verifies that the APQNs derived from the cross product of the AP adapter IDs - * and AP queue indexes comprising the AP matrix are not configured for another + * and AP queue indexes comprising an AP matrix are not assigned to another * mediated device. AP queue sharing is not allowed. * * @matrix_mdev: the mediated matrix device + * @mdev_apm: mask indicating the APIDs of the APQNs to be verified + * @mdev_aqm: mask indicating the APQIs of the APQNs to be verified * * Returns 0 if the APQNs are not shared, otherwise; returns -EADDRINUSE. */ -static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev) +static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev, + unsigned long *mdev_apm, + unsigned long *mdev_aqm) { struct ap_matrix_mdev *lstdev; DECLARE_BITMAP(apm, AP_DEVICES); @@ -543,14 +561,15 @@ static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev) * We work on full longs, as we can only exclude the leftover * bits in non-inverse order. The leftover is all zeros. */ - if (!bitmap_and(apm, matrix_mdev->matrix.apm, - lstdev->matrix.apm, AP_DEVICES)) + if (!bitmap_and(apm, mdev_apm, lstdev->matrix.apm, AP_DEVICES)) continue; - if (!bitmap_and(aqm, matrix_mdev->matrix.aqm, - lstdev->matrix.aqm, AP_DOMAINS)) + if (!bitmap_and(aqm, mdev_aqm, lstdev->matrix.aqm, AP_DOMAINS)) continue; + vfio_ap_mdev_log_sharing_err(dev_name(mdev_dev(lstdev->mdev)), + apm, aqm); + return -EADDRINUSE; } @@ -676,6 +695,7 @@ static ssize_t assign_adapter_store(struct device *dev, { int ret; unsigned long apid; + DECLARE_BITMAP(apm, AP_DEVICES); struct mdev_device *mdev = mdev_from_dev(dev); struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev); @@ -701,18 +721,18 @@ static ssize_t assign_adapter_store(struct device *dev, if (ret) goto done; - set_bit_inv(apid, matrix_mdev->matrix.apm); + memset(apm, 0, sizeof(apm)); + set_bit_inv(apid, apm); - ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev); + ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev, apm, + matrix_mdev->matrix.aqm); if (ret) - goto share_err; + goto done; + set_bit_inv(apid, matrix_mdev->matrix.apm); vfio_ap_mdev_link_queues(matrix_mdev, LINK_APID, apid); ret = count; - goto done; -share_err: - clear_bit_inv(apid, matrix_mdev->matrix.apm); done: mutex_unlock(&matrix_dev->lock); @@ -824,6 +844,7 @@ static ssize_t assign_domain_store(struct device *dev, { int ret; unsigned long apqi; + DECLARE_BITMAP(aqm, AP_DOMAINS); struct mdev_device *mdev = mdev_from_dev(dev); struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev); unsigned long max_apqi = matrix_mdev->matrix.aqm_max; @@ -844,18 +865,18 @@ static ssize_t assign_domain_store(struct device *dev, if (ret) goto done; - set_bit_inv(apqi, matrix_mdev->matrix.aqm); + memset(aqm, 0, sizeof(aqm)); + set_bit_inv(apqi, aqm); - ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev); + ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev, + matrix_mdev->matrix.apm, aqm); if (ret) - goto share_err; + goto done; + set_bit_inv(apqi, matrix_mdev->matrix.aqm); vfio_ap_mdev_link_queues(matrix_mdev, LINK_APQI, apqi); ret = count; - goto done; -share_err: - clear_bit_inv(apqi, matrix_mdev->matrix.aqm); done: mutex_unlock(&matrix_dev->lock); @@ -1434,3 +1455,14 @@ void vfio_ap_mdev_remove_queue(struct ap_queue *queue) kfree(q); mutex_unlock(&matrix_dev->lock); } + +bool vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm) +{ + bool in_use; + + mutex_lock(&matrix_dev->lock); + in_use = !!vfio_ap_mdev_verify_no_sharing(NULL, apm, aqm); + mutex_unlock(&matrix_dev->lock); + + return in_use; +} diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h index 57da703b549a..0c796ef11426 100644 --- a/drivers/s390/crypto/vfio_ap_private.h +++ b/drivers/s390/crypto/vfio_ap_private.h @@ -105,4 +105,6 @@ struct vfio_ap_queue { int vfio_ap_mdev_probe_queue(struct ap_queue *queue); void vfio_ap_mdev_remove_queue(struct ap_queue *queue); +bool vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm); + #endif /* _VFIO_AP_PRIVATE_H_ */ -- 2.21.1