[PATCH v4 4/5] hisi_acc_vfio_pci: bugfix the problem of uninstalling driver

Longfang Liu
2025-02-25T06:29:55Z

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.

Fixes: b0eed085903e ("hisi_acc_vfio_pci: Add support for VFIO live migration")
Signed-off-by: Longfang Liu <liulongfang@huawei.com>
Reviewed-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
index 54c59c92df13..3f0bcd855839 100644
--- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
+++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
@@ -1507,6 +1507,7 @@ 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);
--
2.24.0