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Mon, 2 Nov 2026 15:16:20 +0000 (GMT) Received: from li-4c4c4544-004d-4810-8043-b7c04f423534.ibm.com.com (unknown [9.61.57.150]) by smtpav03.wdc07v.mail.ibm.com (Postfix) with ESMTP; Mon, 2 Nov 2026 15:16:20 +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, freude@linux.ibm.com, borntraeger@de.ibm.com, cohuck@redhat.com, mjrosato@linux.ibm.com, pasic@linux.ibm.com, alex.williamson@redhat.com, kwankhede@nvidia.com, fiuczy@linux.ibm.com Subject: [PATCH v11 11/14] s390/vfio-ap: Callback to get the size of data to be migrated during guest migration Date: Mon, 2 Nov 2026 10:14:51 -0500 Message-ID: <20261102151604.2150055-12-akrowiak@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261102151604.2150055-1-akrowiak@linux.ibm.com> References: <20261102151604.2150055-1-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: 7UR6Zf4TLSb35XQ7iEHft1nOOjk-1xXs X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTAyMDA2MCBTYWx0ZWRfX32ZjAjzhGgiI Eq3Z8jY0pkrMEWhHqqX9Z/594fAOxjx2DESJl7d730WrorcpuQBMPt2yTGdIjOMqJvKr3mikrGU auPWFQoyiufTxcG6gDOVmRPqV8Z27DsPNIUhWIOhTlLK5bENIRmyko0lxlRLyKB36Sc77w6/gIe Gh1yR6CvIiXQlIsYfwdB+8M12f3kPSOBzFH4MtfHGdTkc7v8nXDbmtKuemb7Y0lUN3JZRIuZA0L 8h7IOG9pqMiOExUIxYXGYv9S2DjnQmlLyqklAoAki2nPD3tCfQI8vv4pODX0kR26VEUazWSRnL+ wib1AEhQeA/knzDYYMXQD7UT2U7NZbLYPse/GuMLAHfBJs25s4B/ptChg9CsmhvaSot0IvTCCPL TdyHa9lNJPISpTB2i9yWh75/3FLv8N5dV11SmTTraHdwLmNUlnbiA2tg0S+mWyhyW8cJc6ymuSH h4KweqAsBlTnB30K6OA== X-Proofpoint-Spam-Info: AW1haW4tMjYxMTAyMDA2MCBTYWx0ZWRfX8DTcTJmUUTwL Fe0o58mUgfBkvIHv3Co2sIcuFONriJokYVD1rTdV034gVzai94jWtEiNQAq2Ezmxwcq8LOknCPl b1pnBIE7Mb60u55V6NilsS8m+B3y2cY= X-Proofpoint-GUID: 7UR6Zf4TLSb35XQ7iEHft1nOOjk-1xXs X-Authority-Analysis: v=2.4 cv=EsJHPicA c=1 sm=1 tr=0 ts=6ae8a948 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=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=dNOmgfuV3ZSo10a98CMA:9 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=2026-11-02_04,2026-11-02_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 clxscore=1015 lowpriorityscore=0 malwarescore=0 priorityscore=1501 adultscore=0 impostorscore=0 phishscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610300000 definitions=main-2611020060 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 c5534c6ee3ce..7c282d396f50 100644 --- a/drivers/s390/crypto/vfio_ap_migration.c +++ b/drivers/s390/crypto/vfio_ap_migration.c @@ -1308,7 +1308,15 @@ 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