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Fri, 24 Jul 2026 16:14:15 +0000 (GMT) Received: from li-4c4c4544-004d-4810-8043-b7c04f423534.ibm.com.com (unknown [9.61.50.28]) by smtpav06.wdc07v.mail.ibm.com (Postfix) with ESMTP; Fri, 24 Jul 2026 16:14:14 +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 v5 13/15] s390/vfio-ap: Callback to get the size of data to be migrated during guest migration Date: Fri, 24 Jul 2026 12:13:49 -0400 Message-ID: <20260724161351.1802644-14-akrowiak@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260724161351.1802644-1-akrowiak@linux.ibm.com> References: <20260724161351.1802644-1-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=HJXz0Itv c=1 sm=1 tr=0 ts=6a638f5a cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=vZ-Ft76KQvoWVpZ_:21 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=lW0G1kjGILAuz2jbLQAA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzI0MDE0NSBTYWx0ZWRfX+n17kc+Vus30 YwF1AJbQ8hFVgux5F/+52DoIVLOC6Ob4yiPK2BgWxq0sIfIRxLwEoTLGFqkrJBAzVbsomqX3nxV /OlhjSOVg8SaDmAjZKtFvi+KbVPgIYxA+nnu+34ECOBS7EEX0jygpevjhXSfnq1i44H4Y9eTgAr E3nUPzS1Qlk+NbMxg0MHSmrRbI1sM/GBX76Y+Zw08Tyg97Rhz4qk7RZVeJMzO16IkTbN7T71LOp EbYMSHLXJ7ZPsXHjIcSr8YLjawWbFyly0e7IXnPLkaDCEd1gxHrmCJxl+Lkc/AJDNhxEf7rGtu8 mNRO1Nb54eeME51CmXWtmxWAn8FL8kWKZxPoKWdppo8ndGAXhkCCxCO+/ovcYg7+CnMmqSHTY/j Tp6aovja0bM/yF8MBfGAOouhLQ8R+T+T+4DpU++ZyolUdwFrtroOox+SRU+gtHXEfAhqseZPCpi 7EvFg6Pi9QGDChPOrlQ== X-Proofpoint-ORIG-GUID: LOSlXpvKHcMi9pADCR97esXXcaw6spQW X-Proofpoint-Spam-Info: AW1haW4tMjYwNzI0MDE0NSBTYWx0ZWRfX33lZpkAg8eV9 Tz0cewa4DbnuXmv5CnmBgO26/Hxh8Qvtfp0/JxoAv4ap1W8kt+TxaoN0hkWe5lMin/dJc+w83ke /uaV25wM3aXIGT+OmAwyY4JDZJjj00Y= X-Proofpoint-GUID: LOSlXpvKHcMi9pADCR97esXXcaw6spQW X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-24_03,2026-07-24_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 malwarescore=0 impostorscore=0 clxscore=1015 phishscore=0 spamscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607240145 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 8876338d2898..20b519f0898f 100644 --- a/drivers/s390/crypto/vfio_ap_migration.c +++ b/drivers/s390/crypto/vfio_ap_migration.c @@ -1429,7 +1429,18 @@ 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 = { -- 2.53.0