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Fri, 9 Oct 2026 11:43:09 +0000 (GMT) Received: from li-4c4c4544-004d-4810-8043-b7c04f423534.ibm.com.com (unknown [9.61.159.45]) by smtpav04.wdc07v.mail.ibm.com (Postfix) with ESMTP; Fri, 9 Oct 2026 11:43:09 +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 v8 13/15] s390/vfio-ap: Callback to get the size of data to be migrated during guest migration Date: Fri, 9 Oct 2026 07:42:42 -0400 Message-ID: <20261009114244.1213173-14-akrowiak@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261009114244.1213173-1-akrowiak@linux.ibm.com> References: <20261009114244.1213173-1-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-Proofpoint-GUID: chI24Tp-NXMPL8HaWxn68NEZK51u0TnS X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDA5MDA0NiBTYWx0ZWRfXx0qzyGgXcPvX Aks2FP0ON4uDC+otrsUZXP+bry5dDGBs53Dzz/OuP2VRPULjhI57DXUjc2JxAQZH3yAWM+hBcJ8 pCRnAbKjj6zeUPiQz6RMYnz4m0aXx6IGllp6nPRaAgUK/L9ba19eZshpE4yw9QsZ5knPPZKdU39 9nkjO8BUz82XRbmlWtxRlr1sFQM8L6OPecj487+Qp6ebIFL3nbWswx5Xf0N5O5krv+hIlhG2xwt E7ZK5U4TrPPQ0eBISb93WrSBkh8b1DRNSz97MxuzZ1TC3CLPPwbpBABOrPtZwoRgGS3JEBemDX6 ohEVYaYhGiixCSMs7LOOfVBIHiBlrgNqGVEnWml6NYD8LuVq7KiV78wdkQoEms6IeOY+td8ZQ62 q5mVE9jlu2Vx6aTTt5dykcyLN3u4soU7NN/1vf8tDvf1Ok7KVHrl8Zxckcw+FUhingZD3kTs3Tu AWPC295RDoj5JrOy0dw== X-Authority-Analysis: v=2.4 cv=cIt1IVeN c=1 sm=1 tr=0 ts=6ac8d351 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=vZ-Ft76KQvoWVpZ_:21 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=dNOmgfuV3ZSo10a98CMA:9 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDA5MDA0NiBTYWx0ZWRfX1tliKbttN4Uc zQ0MsOqYKj4jnjvgZjoGzwY0VgnOPIh8hF/M/dK8rZzQSksMeNKJPDn1jdMtCRNt2HR8PfWdwIz CuSbPfWOSCKS2fgfg2DeFUs6gkb9KfI= X-Proofpoint-ORIG-GUID: chI24Tp-NXMPL8HaWxn68NEZK51u0TnS 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=2026-10-09_03,2026-10-08_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 priorityscore=1501 adultscore=0 impostorscore=0 lowpriorityscore=0 suspectscore=0 spamscore=0 phishscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610020000 definitions=main-2610090046 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 ed30e6ff0127..7fa58f086812 100644 --- a/drivers/s390/crypto/vfio_ap_migration.c +++ b/drivers/s390/crypto/vfio_ap_migration.c @@ -1361,7 +1361,15 @@ 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