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Tue, 13 Oct 2026 15:32:44 +0000 (GMT) Received: from li-4c4c4544-004d-4810-8043-b7c04f423534.ibm.com.com (unknown [9.61.17.246]) by smtpav01.wdc07v.mail.ibm.com (Postfix) with ESMTP; Tue, 13 Oct 2026 15:32:43 +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 v9 13/15] s390/vfio-ap: Callback to get the size of data to be migrated during guest migration Date: Tue, 13 Oct 2026 11:32:17 -0400 Message-ID: <20261013153219.3534306-14-akrowiak@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261013153219.3534306-1-akrowiak@linux.ibm.com> References: <20261013153219.3534306-1-akrowiak@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Cr0q4X4D c=1 sm=1 tr=0 ts=6ace4f1f cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=vZ-Ft76KQvoWVpZ_:21 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=jJfqtB0EQghymFthzpkA:9 X-Proofpoint-GUID: 7ZFYTlrK-IIG0_8aplF5iTWeODjmc-bD X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDEzMDA2MCBTYWx0ZWRfXwiRXgyS3mleN rEgl5NLlvOyB7iVLw1E5eSBkX0pPUozPBPRb8fXcaodjnaMvZJljtTImoBNbCbljGKEMrmOeXah E6uxatz0ph5ZdI2cmFmkF+Ads7QY2LkYH+s2xlxoO4D7OM0TlsfsPDIqkyjze2dxWLW9YEk625m TGwuZvKNw0fI+bd99oLbMwHqvXOtDKGwHyq6sh+dMw1z09jQxLxVnhwUWOMYQSoJ50Ra6iWGtv/ CMfX4IQH0DXdAUKZCOID4eL7tyPev+Y+cbrKRvdk/ZTW42J9qwUPUUH4bC3sY5Y/QonqgXOONSW nYLccCqdGxZw21y4TfIEOA4I+gwRqtkl70BdokaC/yM+kGb+oGm0UZlAT5XrnO7AIhvLaZonoky wL11cKncXOFnA8IObcV8B4Ve+tIV4Wuf+AOHdD6igJCGUQPCIg7Ev3FE77gWfhTa78WrlhWd9DQ bUed91s/DjPTSU5Pdlg== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDEzMDA2MCBTYWx0ZWRfXzaBoo6tfCTXc HFQavZE9XHHT2Ir9/p9FXepViILlRMDssiMVMMOD17jjM6YL8Oo0/rnqLo8vhjeMlaeY1MZ3XNa xyY+ELW/rukABkHAPhO6J0o2UUMzJRc= X-Proofpoint-ORIG-GUID: 7ZFYTlrK-IIG0_8aplF5iTWeODjmc-bD X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-13_01,2026-10-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 adultscore=0 priorityscore=1501 suspectscore=0 malwarescore=0 clxscore=1015 impostorscore=0 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610130060 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 fc6b1ecffc95..ef3b41586df9 100644 --- a/drivers/s390/crypto/vfio_ap_migration.c +++ b/drivers/s390/crypto/vfio_ap_migration.c @@ -1371,7 +1371,15 @@ 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