Commit db6525a8 authored by Longfang Liu's avatar Longfang Liu Committed by Alex Williamson
Browse files

hisi_acc_vfio_pci: bugfix the problem of uninstalling driver 



In a live migration scenario. If the number of VFs at the
destination is greater than the source, the recovery operation
will fail and qemu will not be able to complete the process and
exit after shutting down the device FD.

This will cause the driver to be unable to be unloaded normally due
to abnormal reference counting of the live migration driver caused
by the abnormal closing operation of fd.

Therefore, make sure the migration file descriptor references are
always released when the device is closed.

Fixes: b0eed085 ("hisi_acc_vfio_pci: Add support for VFIO live migration")
Signed-off-by: default avatarLongfang Liu <liulongfang@huawei.com>
Reviewed-by: default avatarShameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Link: https://lore.kernel.org/r/20250510081155.55840-5-liulongfang@huawei.com


Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent e63c4663

drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c

+1 −0
Original line number Diff line number Diff line
@@ -1508,6 +1508,7 @@ static void hisi_acc_vfio_pci_close_device(struct vfio_device *core_vdev) 
	struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(core_vdev);

	struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;



	hisi_acc_vf_disable_fds(hisi_acc_vdev);

	mutex_lock(&hisi_acc_vdev->open_mutex);

	hisi_acc_vdev->dev_opened = false;

	iounmap(vf_qm->io_base);