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Tue, 7 Apr 2026 20:51:04 +0000 (GMT) From: Anthony Krowiak To: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: jjherne@linux.ibm.com, borntraeger@de.ibm.com, mjrosato@linux.ibm.com, pasic@linux.ibm.com, alex@shazbot.org, kwankhede@nvidia.com, fiuczy@linux.ibm.com, pbonzini@redhat.com, frankja@linux.ibm.com, imbrenda@linux.ibm.com, agordeev@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com Subject: [PATCH v2 02/16] s390/vfio-ap: Provide access to queue objects and related info Date: Tue, 7 Apr 2026 16:50:18 -0400 Message-ID: <20260407205100.331150-3-akrowiak@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260407205100.331150-1-akrowiak@linux.ibm.com> References: <20260407205100.331150-1-akrowiak@linux.ibm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDA3MDE4OSBTYWx0ZWRfX0GjwjhU2IohS 3jL7JgRd/BiS+Pwi7RiETvlQwqRlkjjpopNSI5CBXpWX0wTyHqGxSAh9B7YJVzJGF40b4vOpnbu Ai4TXLMeC0FfCEdi5xzA8FkKLVZmsfdGw4wq/8q1hDuDa6/CtTkPRjNugQ7TBZoDQP87PyHDu89 7mwQVfukPKaINUZBvlZ0jjyzuK4ud0P/WcpKlrqqQKSd6PTuhvxPtQkW8zUta8c81tXAisLd7X3 rjuswpAV492wYtloKofVSkbksp3JXlXvTdxZv+1ocuNlW4clZ3hGSOaC/l5rSYogI2NhGAIuzVb SR22tIAP5ZE1zvArZmzv3vAL6O0hCIzk760IumWRZlAcrAYuSQXHOKqYcwACRLKiH9mV9ZUoRP8 g8H3okXZH2RhlbCwaEXIajFSMBS8pa1VQ/Fk2rE02L76l9/0Ej7lbwgzjqPPoidYWdBcnuNZyh9 9w+mSx87tHKC1M2banQ== X-Authority-Analysis: v=2.4 cv=FsY1OWrq c=1 sm=1 tr=0 ts=69d56e3d cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=aJOwoqrUralclMrAr6UA:9 X-Proofpoint-ORIG-GUID: WnOF-2kGK3opY9goTc1pd5GgR2Fr1B5G X-Proofpoint-GUID: WnOF-2kGK3opY9goTc1pd5GgR2Fr1B5G X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-07_04,2026-04-07_05,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 priorityscore=1501 impostorscore=0 spamscore=0 phishscore=0 lowpriorityscore=0 clxscore=1015 adultscore=0 malwarescore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604070189 Provide the following: 1. A function that returns a struct vfio_ap_queue object representing a queue that is bound to the vfio_ap device driver and is assigned to an mdev 2. A function that returns the number of queues that are or will be passed through to a guest when the mdev is attached to a guest. There is already a function for #1; however, it is a static function in drivers/s390/crypto/vfio_ap_ops.c. The function will be defined in the drivers/s390/crypto/vfio_ap_private.h file and made non-static. Note that it would probably make sense to ensure that the mdevs_lock is held for this function, so a call to lockdep_assert_held(&matrix_dev->mdevs_lock) will be added to the function implementation. Signed-off-by: Anthony Krowiak --- drivers/s390/crypto/vfio_ap_ops.c | 20 +++++++++++++++++--- drivers/s390/crypto/vfio_ap_private.h | 4 ++++ 2 files changed, 21 insertions(+), 3 deletions(-) diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index ef3101f6865e..cd85866b81a0 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -203,12 +203,12 @@ static inline void get_update_locks_for_queue(struct vfio_ap_queue *q) * Return: the pointer to the vfio_ap_queue struct representing the queue or * NULL if the queue is not assigned to @matrix_mdev */ -static struct vfio_ap_queue *vfio_ap_mdev_get_queue( - struct ap_matrix_mdev *matrix_mdev, - int apqn) +struct vfio_ap_queue *vfio_ap_mdev_get_queue(struct ap_matrix_mdev *matrix_mdev, int apqn) { struct vfio_ap_queue *q; + lockdep_assert_held(&matrix_dev->mdevs_lock); + hash_for_each_possible(matrix_mdev->qtable.queues, q, mdev_qnode, apqn) { if (q && q->apqn == apqn) @@ -2098,6 +2098,20 @@ static void vfio_ap_mdev_request(struct vfio_device *vdev, unsigned int count) release_update_locks_for_mdev(matrix_mdev); } +int vfio_ap_mdev_get_num_queues(struct ap_matrix *ap_matrix) +{ + unsigned long apid, apqi; + int num_queues = 0; + + lockdep_assert_held(&matrix_dev->mdevs_lock); + + for_each_set_bit_inv(apid, ap_matrix->apm, AP_DEVICES) + for_each_set_bit_inv(apqi, ap_matrix->aqm, AP_DOMAINS) + num_queues++; + + return num_queues; +} + static int vfio_ap_mdev_get_device_info(unsigned long arg) { unsigned long minsz; diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h index 39c85bab05c3..d66586825ef4 100644 --- a/drivers/s390/crypto/vfio_ap_private.h +++ b/drivers/s390/crypto/vfio_ap_private.h @@ -153,6 +153,10 @@ struct vfio_ap_queue { struct ap_tapq_hwinfo hwinfo; }; +struct vfio_ap_queue *vfio_ap_mdev_get_queue(struct ap_matrix_mdev *matrix_mdev, int apqn); + +int vfio_ap_mdev_get_num_queues(struct ap_matrix *ap_matrix); + int vfio_ap_mdev_register(void); void vfio_ap_mdev_unregister(void); -- 2.52.0