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hisi_acc_vfio_pci: bugfix cache write-back issue

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[ Upstream commit e63c466398731bb7867f42f44b76fa984de59db2 ]

At present, cache write-back is placed in the device data
copy stage after stopping the device operation.
Writing back to the cache at this stage will cause the data
obtained by the cache to be written back to be empty.

In order to ensure that the cache data is written back
successfully, the data needs to be written back into the
stop device stage.

Fixes: b0eed08590 ("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/20250510081155.55840-4-liulongfang@huawei.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Longfang Liu
2025-05-10 16:11:52 +08:00
committed by Greg Kroah-Hartman
parent ea405fb414
commit bac4641756
1 changed files with 7 additions and 6 deletions
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13
drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
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@@ -554,12 +554,6 @@ static int vf_qm_state_save(struct hisi_acc_vf_core_device *hisi_acc_vdev,
vf_data->vf_qm_state = QM_READY;
hisi_acc_vdev->vf_qm_state = vf_data->vf_qm_state;
ret = vf_qm_cache_wb(vf_qm);
if (ret) {
dev_err(dev, "failed to writeback QM Cache!\n");
return ret;
}
ret = qm_get_regs(vf_qm, vf_data);
if (ret)
return -EINVAL;
@@ -985,6 +979,13 @@ static int hisi_acc_vf_stop_device(struct hisi_acc_vf_core_device *hisi_acc_vdev
dev_err(dev, "failed to check QM INT state!\n");
return ret;
}
ret = vf_qm_cache_wb(vf_qm);
if (ret) {
dev_err(dev, "failed to writeback QM cache!\n");
return ret;
}
return 0;
}