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Fri, 6 Nov 2026 15:23:20 +0000 (GMT) Received: from li-4c4c4544-004d-4810-8043-b7c04f423534.ibm.com.com (unknown [9.61.114.69]) by smtpav06.wdc07v.mail.ibm.com (Postfix) with ESMTP; Fri, 6 Nov 2026 15:23:20 +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 v12 11/14] s390/vfio-ap: Callback to get the size of data to be migrated during guest migration Date: Fri, 6 Nov 2026 10:22:56 -0500 Message-ID: <20261106152259.1360651-12-akrowiak@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261106152259.1360651-1-akrowiak@linux.ibm.com> References: <20261106152259.1360651-1-akrowiak@linux.ibm.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: DIo0wkpYe2o3jN2R9kJj2KdM4Q-MD6e3 X-Authority-Analysis: v=2.4 cv=A635rKWG c=1 sm=1 tr=0 ts=6aedf0ed cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=vZ-Ft76KQvoWVpZ_:21 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=dNOmgfuV3ZSo10a98CMA:9 X-Proofpoint-GUID: DIo0wkpYe2o3jN2R9kJj2KdM4Q-MD6e3 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTA2MDA2MCBTYWx0ZWRfX4iIJGrAc6Lfn f5wD9emVure9x5ZtP2qfSiQYEjO1gg27e3Zmbl8DPw5DH26uoP6RI2r7Nw2CGpU+gMVa9O53MiB CsIMFYyW8p2X9w+JFyJXJ7gRQV44oFGVyLywv3EhTVHLQX9wk06rXvwbCYRIF86U0Xjfum/AAfU ATudQD5yvQwqcsggEiA7vCZ5LozOztNuIIoi0eiYHJeUutKFLc7RWVenvgq1NlDdS5CPO8fzmzh zf6sF8sc50Qk85i9BUEwM9Mph6a1yeuZR813FBKSAnFPYOvV5lo8ggHU2XqfDhtXsvJwTCnLw1A qgTLBZhCyH9toErrPNAgjuRDTKByl+hCSvw9Vm0bjauhH905Odq02I+ex7FaLGGKHWYBts0S5jG fl3yQ7o3h+2BJA+cn63F/+2e1jsHAG9T3I1//1C0i62QzaErihIkMzCkH3cA3zrphS/5gxXhDvM Ck3aJrZ71ZcFXR3AmYg== X-Proofpoint-Spam-Info: AW1haW4tMjYxMTA2MDA2MCBTYWx0ZWRfX/gnM8QCsdHo7 EiDvjwxdRo88JVvvlHaQq6UHMY9/g2VfgfXyFIQhO2+9BYb+NGOJI5TPJZ/aOOTIZgGxqaIpMy1 /qlMSwm0jZBWlgKGzA4mghpPIez8Im0= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-06_05,2026-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 priorityscore=1501 impostorscore=0 phishscore=0 spamscore=0 malwarescore=0 adultscore=0 suspectscore=0 clxscore=1015 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611060060 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 Reviewed-by: Jason J. Herne --- drivers/s390/crypto/vfio_ap_migration.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/s390/crypto/vfio_ap_migration.c b/drivers/s390/crypto/vfio_ap_migration.c index c6d4048b1299..4af734aeee17 100644 --- a/drivers/s390/crypto/vfio_ap_migration.c +++ b/drivers/s390/crypto/vfio_ap_migration.c @@ -1299,7 +1299,15 @@ 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; + int num_queues; + + mutex_lock(&matrix_dev->mdevs_lock); + matrix_mdev = container_of(vdev, struct ap_matrix_mdev, vdev); + *stop_copy_length = vfio_ap_config_size(matrix_mdev, &num_queues); + mutex_unlock(&matrix_dev->mdevs_lock); + + return 0; } static const struct vfio_migration_ops vfio_ap_migration_ops = { -- 2.53.0