6.12-stable review patch. If anyone has any objections, please let me know.
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From: Longfang Liu liulongfang@huawei.com
[ Upstream commit db6525a8573957faea28850392f4744e5f8f7a53 ]
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: 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 Link: https://lore.kernel.org/r/20250510081155.55840-5-liulongfang@huawei.com Signed-off-by: Alex Williamson alex.williamson@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 e37699fc03707..dda8cb3262e0b 100644 --- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c +++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c @@ -1359,6 +1359,7 @@ static void hisi_acc_vfio_pci_close_device(struct vfio_device *core_vdev) struct hisi_acc_vf_core_device, core_device.vdev); struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
+ hisi_acc_vf_disable_fds(hisi_acc_vdev); iounmap(vf_qm->io_base); vfio_pci_core_close_device(core_vdev); }