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Tue, 7 Apr 2026 20:51:25 +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 14/16] s390/vfio-ap: Callback to get the size of data to be migrated during guest migration Date: Tue, 7 Apr 2026 16:50:30 -0400 Message-ID: <20260407205100.331150-15-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: AW1haW4tMjYwNDA3MDE4OSBTYWx0ZWRfX+O2kGFV4h4F5 NuzNKtX6n7WN6+bVVNF5IgBD/wZN0Y3J8ZRjlxeKe/FwEd43N1OCMxYKKfkLskFzH/8SSEkx1WO /IACpAKuY2BfAmwjRv6N71QHYGUFIXsSKSSX0xRuwivdopGyY9D7zJzg98fukIKYRY7/ObsAG9N B4oXI1rVRWsvUu4unYPhT+ADAiAH4fJMVL1JDT38u/ZspFrBu+XRV2P5J9PCYqvO3kfQId7u7Xx 0DoAKQkrGeIIKD8lVlj7FPwf3vg1YFSM132OTfYxypEUmQODNpVd2MP/9q6zzF44B6B5PHFfGuu VnH4veXKylPpwOXNL25Nwn+G42JsJhgf5gf1pbi+cNk1GV9DEGoi8jyL77zuh/fapcOapkwi6s6 r698Y8p5eNP+Nk6BKsAr6pqIjJFGds5IpYQpwaWTqRJberWgV9C8+OnM/o4/+3LzI801RreS94l /tMU0sDKQzIgcjEBdKA== X-Proofpoint-ORIG-GUID: 6jPwEGK_DzP451pBnEuItHEvpGYdkj5k X-Authority-Analysis: v=2.4 cv=e9k2j6p/ c=1 sm=1 tr=0 ts=69d56e52 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=vZ-Ft76KQvoWVpZ_:21 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=dNOmgfuV3ZSo10a98CMA:9 X-Proofpoint-GUID: 6jPwEGK_DzP451pBnEuItHEvpGYdkj5k 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 clxscore=1015 impostorscore=0 malwarescore=0 suspectscore=0 spamscore=0 bulkscore=0 adultscore=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604070189 Callback to get the estimated data length of the data that will be required to complete reading of the vfio device's internal state. It's mandatory for VFIO_DEVICE_FEATURE_MIGRATION migration support. The function pointer for this callback is specified via the 'migration_get_data_size' field of the 'vfio_migration_ops' structure which is stored with the VFIO device when the 'vfio_device' structure representing the mediated device is initialized. Signed-off-by: Anthony Krowiak --- drivers/s390/crypto/vfio_ap_migration.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/s390/crypto/vfio_ap_migration.c b/drivers/s390/crypto/vfio_ap_migration.c index f9b219083e0f..ad751df33af0 100644 --- a/drivers/s390/crypto/vfio_ap_migration.c +++ b/drivers/s390/crypto/vfio_ap_migration.c @@ -1033,7 +1033,18 @@ static int vfio_ap_get_state(struct vfio_device *vdev, static int vfio_ap_get_data_size(struct vfio_device *vdev, unsigned long *stop_copy_length) { - return -EOPNOTSUPP; + struct ap_matrix_mdev *matrix_mdev; + size_t qinfo_sz; + int num_queues; + + mutex_lock(&matrix_dev->mdevs_lock); + matrix_mdev = container_of(vdev, struct ap_matrix_mdev, vdev); + num_queues = vfio_ap_mdev_get_num_queues(&matrix_mdev->shadow_apcb); + qinfo_sz = num_queues * sizeof(struct vfio_ap_queue_info); + *stop_copy_length = qinfo_sz + sizeof(struct vfio_ap_config); + mutex_unlock(&matrix_dev->mdevs_lock); + + return 0; } static const struct vfio_migration_ops vfio_ap_migration_ops = { -- 2.52.0