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Wed, 25 Mar 2026 21:02:13 +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 Subject: [PATCH v1 21/24] s390/vfio-ap: Callback to get the size of data to be migrated during guest migration Date: Wed, 25 Mar 2026 17:01:08 -0400 Message-ID: <20260325210149.888028-22-akrowiak@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260325210149.888028-1-akrowiak@linux.ibm.com> References: <20260325210149.888028-1-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: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI1MDE0OSBTYWx0ZWRfX6q5t5KOgfPO7 6q2PLem/DzXK7w5QBDyob1OuuGfEun+VF8BAZdCWuEaKWigtvQCNu/v2L/omIh8zKwkNj+3dJiM uRks9k1lO5wI+JFS5YjxDfg1fBC0o6LZNwy+DLJmLSNuAfd6qKQ82YCdrGPwUBY2cXD+IO48tkF e1gyYFcVUrc0H7pvbTvC5DX+w3TshmEwZjW+sm0+z8DHrV3I9Vd9qBC9wWJWLB8bfR1hf/NTHCQ 5GMY2nTg3rr+u0TBirt0SnN59513uwPRvbLlKUxgbp43Wqg/RRcT51t1QRaSsqWcOf7Ix020kQB yEm5Gd+2OsMpLa/3A9K0UmgOCTxVYvB36J5BTAfPr2mdaXxVASKp4csi+H9MknnA6buip6teroU Z+g0hmIDk2N5wWqcanWYMl1FeW4QDUYtUFE43xYL/aXHCFPqM4yASA5LwrU5OFz1tZ5zRAW5CO5 LkAY3cMbtRzMwiJuxrw== X-Authority-Analysis: v=2.4 cv=JK42csKb c=1 sm=1 tr=0 ts=69c44d59 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=vZ-Ft76KQvoWVpZ_:21 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=dNOmgfuV3ZSo10a98CMA:9 X-Proofpoint-ORIG-GUID: _Uy-j11J_hFigo7g-_aX2hlObYiSSDPM X-Proofpoint-GUID: _Uy-j11J_hFigo7g-_aX2hlObYiSSDPM 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=2026-03-25_05,2026-03-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 adultscore=0 spamscore=0 suspectscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603250149 Content-Type: text/plain; charset="utf-8" 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 305fd3221be1..fa163b129c66 100644 --- a/drivers/s390/crypto/vfio_ap_migration.c +++ b/drivers/s390/crypto/vfio_ap_migration.c @@ -1031,7 +1031,18 @@ static int vfio_ap_get_state(struct vfio_device *vde= v, 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 =3D container_of(vdev, struct ap_matrix_mdev, vdev); + num_queues =3D vfio_ap_mdev_get_num_queues(&matrix_mdev->shadow_apcb); + qinfo_sz =3D num_queues * sizeof(struct vfio_ap_queue_info); + *stop_copy_length =3D qinfo_sz + sizeof(struct vfio_ap_config); + mutex_unlock(&matrix_dev->mdevs_lock); + + return 0; } =20 static const struct vfio_migration_ops vfio_ap_migration_ops =3D { --=20 2.52.0