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Fri, 7 Aug 2026 22:18:49 +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 v7 13/15] s390/vfio-ap: Callback to get the size of data to be migrated during guest migration Date: Fri, 7 Aug 2026 18:18:32 -0400 Message-ID: <20260807221834.562851-14-akrowiak@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260807221834.562851-1-akrowiak@linux.ibm.com> References: <20260807221834.562851-1-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-Spam-Info: AW1haW4tMjYwODA3MDE3NSBTYWx0ZWRfX0X2vOxt8nD3B qs/hBPR+DKcQCttlMyfBjYu+MOrNkMkw5sPbLTSDJNKwQ8CsZfVH4QDuvB6klX1rZtrRiPZjdMV Wwg7iFabh9UK338Fehihm2ggIVsKB30= X-Authority-Analysis: v=2.4 cv=VPTtWdPX c=1 sm=1 tr=0 ts=6a7659cc cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=vZ-Ft76KQvoWVpZ_:21 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=dNOmgfuV3ZSo10a98CMA:9 X-Proofpoint-ORIG-GUID: oKeqO4mDgeUfbwuX4PSgkm5eQLGAVtv9 X-Proofpoint-GUID: oKeqO4mDgeUfbwuX4PSgkm5eQLGAVtv9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODA3MDE3NSBTYWx0ZWRfX+lL70xkh06uh OoOtpZyo8xs7aH8AMFUo9Mgo5v5fXI+w5gGCDxeQlswsbuYmeNpwObPcbe4ai55zVOSq3KxqPOg W9Q4b+RONA6EZwfn2e8LyJspEhpSUcOlg9S8710Ac9l4eRmfAZ9UAGf7f+Q7ELbycnzDmn+iT0R RVuurjh8kkAhSkWpDCa9e+XKOBVXFuyiWanDFYx6DgvcDkylnLmNrxtjDGzvlT0jGsNoRgGvPPE L+UHO4VN7MkndOrtUCAy29SmcbVy9KBwP8FGgYPtIz6mGmSN6useUtt2f+VxisCWB3QH2Z4y+S8 jzQc11xMD+YQCNccFV0mx8oOjOec1fjerE5ngQi+UhPt1IRhDc+ZLdjlpzNPic3mZF4bjO8ECfo fZdCSbkbgaEBG21acRGLZ5mq6uvcATPYiZTCLU/ILffesPfs91hPPBUwc1WxIFgqTSWTMFflC7H D7oZ6yD9ug/tEbjCBng== 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=2026-08-07_05,2026-08-07_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 spamscore=0 clxscore=1015 priorityscore=1501 phishscore=0 impostorscore=0 adultscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608070175 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 | 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 24955f70e13e..01933a62dab9 100644 --- a/drivers/s390/crypto/vfio_ap_migration.c +++ b/drivers/s390/crypto/vfio_ap_migration.c @@ -1636,7 +1636,15 @@ 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