[PATCH v6 0/2] fix two issues in hisi_acc_vfio_pci driver

[Longfang Liu <liulongfang@huawei.com>]

This series fixes two issues in the HiSilicon ACC VFIO PCI driver:
1. A NULL pointer dereference in reset_prepare() when a PF is bound
to the driver and passed through to a VM.
2. A 64KB page incompatibility on QM_HW_V3 hardware that breaks
migration and the guest kernel.

Changes since v5:
- Fix a potential NULL dereference in reset_prepare().
  Open code &qm->pdev->dev at dev_err() to drop the local variable
  evaluated before the mig_ops check.

Changes since v4:
- Removed dev_err() log from reset_prepare().
- Removed redundant pdev->is_virtfn check from probe().

Changes since v3:
- Merged the set_reset_flag fix into patch 1 (was a separate patch in v3)
- Replaced pf_qm guards with a mig_ops check at function entry.
- Moved the 64KB page check from open_device to probe, selecting generic
  ops instead of rejecting the device.

Changes since v2:
- Remove redundant qm->io_base check.
- Drop PAGE_ALIGN for BAR2 configuration region.

Longfang Liu (2):
  hisi_acc_vfio_pci: fix NULL dereference in reset_prepare on PF
    passthrough
  hisi_acc_vfio_pci: reject live migration on 64KB page with QM_HW_V3
    hardware

 drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 46 ++++++++++++-------
 1 file changed, 29 insertions(+), 17 deletions(-)

-- 
2.43.0