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Wed, 25 Mar 2026 21:02:07 +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 15/24] s390/vfio-ap: Transition device migration state from STOP to RESUMING Date: Wed, 25 Mar 2026 17:01:02 -0400 Message-ID: <20260325210149.888028-16-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-ORIG-GUID: CxI9jjkuhzvmFVBRYJjQAGjZ5bST7LNB X-Authority-Analysis: v=2.4 cv=aMr9aL9m c=1 sm=1 tr=0 ts=69c44d52 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=DHoCqielVpiR_Jvp3-wA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI1MDE0OSBTYWx0ZWRfX5SIprQFtmlkN F7TAibLf9K4Xmk33cM8HcrR/Eayw/OFsxfAG8cT8aKb6eqxryS+yQ9XfGvXxaW9J338YqWDk76U 8pJvIVQRN1VEY7GPtxpo1gWUIbxNDCayWoND0S7GMSmp+xmppP1+S11ZXkQmaNJEBlAo2aUZJ3B qvhnSeM0HMvaR0S+klJm22ydmJKL+oSbzvaRDLyhpnLFyoNbeSWStt7LcSH3Cze+efypEac2DfB VskzYDP3kD2iClWBcWLVO7O8VWLgilo3JtjbEdAzun2p6YfZKOcGZ+l0RMFRgz9gnhe+HQUz0hh Co2U+/CxjZHEAMEehXGrHTrbbnONqDdDzDv80waWfgVerJUnaRgfUndkA2KcDfRXMvuY/wYA6nV h2YIaUDmhVjOOqm4KFGK+ctGNTqTlaOjZ0bY9U9+JGeoD90hxN01tSwrrx//jacdgYPAPDagbUg 00mfFVs/JIfkRRK2pcw== X-Proofpoint-GUID: CxI9jjkuhzvmFVBRYJjQAGjZ5bST7LNB 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 spamscore=0 lowpriorityscore=0 adultscore=0 impostorscore=0 malwarescore=0 suspectscore=0 phishscore=0 priorityscore=1501 bulkscore=0 clxscore=1015 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" 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. Signed-off-by: Anthony Krowiak --- drivers/s390/crypto/vfio_ap_migration.c | 55 ++++++++++++++++++++++++- 1 file changed, 53 insertions(+), 2 deletions(-) diff --git a/drivers/s390/crypto/vfio_ap_migration.c b/drivers/s390/crypto/= vfio_ap_migration.c index a340dca1426c..a243ea134794 100644 --- a/drivers/s390/crypto/vfio_ap_migration.c +++ b/drivers/s390/crypto/vfio_ap_migration.c @@ -310,6 +310,46 @@ vfio_ap_save_mdev_state(struct ap_matrix_mdev *matrix_= mdev) return mig_data->saving_migf; } =20 +static ssize_t vfio_ap_resume_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 =3D { + .owner =3D THIS_MODULE, + .write =3D vfio_ap_resume_write, + .release =3D vfio_ap_release_migf, +}; + +static struct vfio_ap_migration_file * +vfio_ap_resume_mdev_state(struct ap_matrix_mdev *matrix_mdev) +{ + struct vfio_ap_migration_data *mig_data; + struct vfio_ap_migration_file *migf; + struct file *filp; + + lockdep_assert_held(&matrix_dev->mdevs_lock); + mig_data =3D matrix_mdev->mig_data; + + migf =3D vfio_ap_allocate_migf(matrix_mdev); + if (IS_ERR(migf)) + return ERR_CAST(migf); + + filp =3D vfio_ap_open_file_stream(migf, &vfio_ap_resume_fops, O_WRONLY); + if (IS_ERR(filp)) { + vfio_ap_deallocate_migf(migf); + return ERR_CAST(filp); + } + + migf->matrix_mdev =3D matrix_mdev; + migf->filp =3D filp; + mig_data->resuming_migf =3D migf; + + return migf; +} + static struct file * vfio_ap_transition_to_state(struct ap_matrix_mdev *matrix_mdev, enum vfio_device_mig_state new_state) @@ -343,10 +383,21 @@ vfio_ap_transition_to_state(struct ap_matrix_mdev *ma= trix_mdev, return NULL; } =20 + /* + * Starts the process of restoring the state of the vfio-ap device + * on the target host by creating a filestream to be used to transfer + * the internal state of the vfio-ap device on the source host that + * was saved during the STOP_COPY phase of the migration. + */ if (cur_state =3D=3D VFIO_DEVICE_STATE_STOP && new_state =3D=3D VFIO_DEVICE_STATE_RESUMING) { - /* TODO */ - return ERR_PTR(-EOPNOTSUPP); + migf =3D vfio_ap_resume_mdev_state(matrix_mdev); + if (IS_ERR(migf)) + return ERR_CAST(migf); + + get_file(migf->filp); + + return migf->filp; } =20 if (cur_state =3D=3D VFIO_DEVICE_STATE_RESUMING && --=20 2.52.0