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Fri, 24 Jul 2026 16:14:06 +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 16:14:06 +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 08/15] s390/vfio-ap: Transition device migration state from STOP to RESUMING Date: Fri, 24 Jul 2026 12:13:44 -0400 Message-ID: <20260724161351.1802644-9-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-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 3mPnQELeimcjQRtQbZLICFGNah5evglK X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzI0MDE0NSBTYWx0ZWRfXwZfPcsTZ4cD6 ZtywCqC8utBBBNO8WDUoVO0sHhHF71DMDe+HmNqcNSL/qe+Jn+I8i8/hcKpQcgT1s40Hm49gX9Z e72styOupCU6N+UkbwXKRwyw7QaNXFtptguUqK3fk85UelHGtNVxU37pSmTrYDT+L3C3T7EeDLp 7ozaXJCcfug5Vcdpzdyi0zMimnvZ8wx7UasqN9KBAD0jct+C6BAakmmKU1TZcJbr0x2oukX2Qlv yZ99PY1C0G+rYikZRe/ZW8/UE8Hvy2uusth2yJDbqbijaDyi9u4+zwesslEhmN8HyzalMWecMkh CS4Vf6x2eDxEnD9/VjvgyyYWmKJ6XW+92SVcv//fvlDeek8vuX39kEY+/HagumqhYxj9rlfZr5f yY6dgzXlUkJcghE8k/TqEXnGK2ffH5YJBqJ1xJTrUm9YuvuWmp6/kTqGSGFjrmS8Tixd8armq0Y KETK7N3UNoDTxstXukw== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzI0MDE0NSBTYWx0ZWRfX3sylQC/e59xv 0T2JBgLJgAwv+PooY6CmLwoFqdGMj78oI08McKoPYsgob/5PpF+hdQx3tYaCEKu83zd2SbbNQWr vTnQOY953v5w0Xzyoqo1Mo3Bhbl/4hA= X-Proofpoint-GUID: 3mPnQELeimcjQRtQbZLICFGNah5evglK X-Authority-Analysis: v=2.4 cv=SM5ykuvH c=1 sm=1 tr=0 ts=6a638f51 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=hRsAbhqWHO6Cr0izqpsA:9 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 clxscore=1015 lowpriorityscore=0 bulkscore=0 suspectscore=0 adultscore=0 spamscore=0 malwarescore=0 priorityscore=1501 phishscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607240145 Transitioning from VFIO_DEVICE_STATE_STOP to VFIO_DEVICE_STATE_RESUMING starts a process of restoring the device state of the vfio device on the target system. To prepare for restoring the device state, open a file stream to receive the guest's AP configuration saved when the device state on the source system transitioned from VFIO_DEVICE_STATE_STOP to VFIO_DEVICE_STATE_STOP_COPY. Note: This commit introduces the file operations structure for migration state files with a stub implementation of the write operation. The complete implementation is provided in the subsequent commit. This incremental approach allows for easier review of the migration infrastructure setup separate from the actual implementation logic. Signed-off-by: Anthony Krowiak --- drivers/s390/crypto/vfio_ap_migration.c | 51 ++++++++++++++++++++++++- 1 file changed, 49 insertions(+), 2 deletions(-) diff --git a/drivers/s390/crypto/vfio_ap_migration.c b/drivers/s390/crypto/vfio_ap_migration.c index 0d949ec205de..4a489a7a05ff 100644 --- a/drivers/s390/crypto/vfio_ap_migration.c +++ b/drivers/s390/crypto/vfio_ap_migration.c @@ -82,6 +82,15 @@ vfio_ap_release_stop_copy_file(struct vfio_ap_migration_data *mig_data) mig_data->stop_copy_mig_file.filp = NULL; } +static void +vfio_ap_release_resuming_file(struct vfio_ap_migration_data *mig_data) +{ + kfree(mig_data->resuming_mig_file.ap_config); + mig_data->resuming_mig_file.ap_config = NULL; + mig_data->resuming_mig_file.config_sz = 0; + mig_data->resuming_mig_file.filp = NULL; +} + static int vfio_ap_release_mig_file(struct inode *file_inode, struct file *filp) { struct ap_matrix_mdev *matrix_mdev; @@ -97,6 +106,8 @@ static int vfio_ap_release_mig_file(struct inode *file_inode, struct file *filp) if (filp == matrix_mdev->mig_data->stop_copy_mig_file.filp) vfio_ap_release_stop_copy_file(matrix_mdev->mig_data); + else if (filp == matrix_mdev->mig_data->resuming_mig_file.filp) + vfio_ap_release_resuming_file(matrix_mdev->mig_data); else ret = -ENOENT; @@ -398,6 +409,32 @@ static struct file *vfio_ap_open_file_stream(struct ap_matrix_mdev *matrix_mdev, return filp; } +static ssize_t vfio_ap_resuming_write(struct file *filp, const char __user *buf, + size_t len, loff_t *pos) +{ + /* TODO */ + return -EOPNOTSUPP; +} + +static const struct file_operations vfio_ap_resume_fops = { + .owner = THIS_MODULE, + .write = vfio_ap_resuming_write, + .release = vfio_ap_release_mig_file, +}; + +static struct file *vfio_ap_resuming_init(struct ap_matrix_mdev *matrix_mdev) +{ + struct vfio_ap_migration_data *mig_data; + struct file *filp; + + lockdep_assert_held(&matrix_dev->mdevs_lock); + + mig_data = matrix_mdev->mig_data; + filp = vfio_ap_open_file_stream(matrix_mdev, &vfio_ap_resume_fops, O_WRONLY); + + return filp; +} + static struct file * vfio_ap_transition_to_state(struct ap_matrix_mdev *matrix_mdev, enum vfio_device_mig_state new_state) @@ -429,10 +466,20 @@ vfio_ap_transition_to_state(struct ap_matrix_mdev *matrix_mdev, return filp; } + /* + * Begins the process of restoring the vfio device state by creating and + * returning a streaming data_fd to be used to read in the internal + * state of the vfio-ap device on the destination host. + */ if (cur_state == VFIO_DEVICE_STATE_STOP && new_state == VFIO_DEVICE_STATE_RESUMING) { - /* TODO */ - return ERR_PTR(-EOPNOTSUPP); + struct file *filp = vfio_ap_resuming_init(matrix_mdev); + + if (IS_ERR(filp)) + return ERR_CAST(filp); + + mig_data->resuming_mig_file.filp = filp; + return filp; } if ((cur_state == VFIO_DEVICE_STATE_RESUMING && -- 2.53.0