[PATCH v8 0/9] vfio/hisilicon: add ACC live migration driver

[Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>]

Hi,

This series attempts to add vfio live migration support for HiSilicon
ACC VF devices based on the new v2 migration protocol definition and
mlx5 v9 series discussed here[0].

v7 --> v8
 - Dropped PRE_COPY support and early compatibility checking based on
   the discussion here[1].
 - Addressed comments from John, Jason & Alex (Thanks!).

This is sanity tested on a HiSilicon platform using the Qemu branch
provided here[2].

Please take a look and let me know your feedback.

Thanks,
Shameer
[0] https://lore.kernel.org/kvm/20220224142024.147653-1-yishaih@nvidia.com/
[1] https://lore.kernel.org/kvm/20220302133159.3c803f56.alex.williamson@redhat.com/
[2] https://github.com/jgunthorpe/qemu/commits/vfio_migration_v2

v6 --> v7
 -Renamed MIG_PRECOPY ioctl name and struct name. Updated ioctl descriptions
  regarding ioctl validity (patch #7).
- Adressed comments from Jason and Alex on PRE_COPY read() and ioctl() fns
  (patch #9).
- Moved only VF PCI ids to pci_ids.h(patch #3).

v5 --> v6
 -Report PRE_COPY support and use that for early compatibility check
  between src and dst devices.
 -For generic PRE_COPY support, included patch #7 from Jason(Thanks!).
 -Addressed comments from Alex(Thanks!).
 -Added the QM state register update to QM driver(patch #8) since that
  is being used in migration driver to decide whether the device is
  ready to save the state.

RFCv4 --> v5
  - Dropped RFC tag as v2 migration APIs are more stable now.
  - Addressed review comments from Jason and Alex (Thanks!).

v3 --> RFCv4
-Based on migration v2 protocol and mlx5 v7 series.
-Added RFC tag again as migration v2 protocol is still under discussion.
-Added new patch #6 to retrieve the PF QM data.
-PRE_COPY compatibility check is now done after the migration data
 transfer. This is not ideal and needs discussion.

RFC v2 --> v3
 -Dropped RFC tag as the vfio_pci_core subsystem framework is now
  part of 5.15-rc1.
 -Added override methods for vfio_device_ops read/write/mmap calls
  to limit the access within the functional register space.
 -Patches 1 to 3 are code refactoring to move the common ACC QM
  definitions and header around.

RFCv1 --> RFCv2

 -Adds a new vendor-specific vfio_pci driver(hisi-acc-vfio-pci)
  for HiSilicon ACC VF devices based on the new vfio-pci-core
  framework proposal.

 -Since HiSilicon ACC VF device MMIO space contains both the
  functional register space and migration control register space,
  override the vfio_device_ops ioctl method to report only the
  functional space to VMs.

 -For a successful migration, we still need access to VF dev
  functional register space mainly to read the status registers.
  But accessing these while the Guest vCPUs are running may leave
  a security hole. To avoid any potential security issues, we
  map/unmap the MMIO regions on a need basis and is safe to do so.
  (Please see hisi_acc_vf_ioremap/unmap() fns in patch #4).
 
 -Dropped debugfs support for now.
 -Uses common QM functions for mailbox access(patch #3).

Longfang Liu (3):
  crypto: hisilicon/qm: Move few definitions to common header
  crypto: hisilicon/qm: Set the VF QM state register
  hisi_acc_vfio_pci: Add support for VFIO live migration

Shameer Kolothum (6):
  crypto: hisilicon/qm: Move the QM header to include/linux
  hisi_acc_qm: Move VF PCI device IDs to common header
  hisi_acc_vfio_pci: add new vfio_pci driver for HiSilicon ACC devices
  hisi_acc_vfio_pci: Restrict access to VF dev BAR2 migration region
  hisi_acc_vfio_pci: Add helper to retrieve the struct pci_driver
  hisi_acc_vfio_pci: Use its own PCI reset_done error handler

 drivers/crypto/hisilicon/hpre/hpre.h          |    2 +-
 drivers/crypto/hisilicon/hpre/hpre_main.c     |   19 +-
 drivers/crypto/hisilicon/qm.c                 |   68 +-
 drivers/crypto/hisilicon/sec2/sec.h           |    2 +-
 drivers/crypto/hisilicon/sec2/sec_main.c      |   21 +-
 drivers/crypto/hisilicon/sgl.c                |    2 +-
 drivers/crypto/hisilicon/zip/zip.h            |    2 +-
 drivers/crypto/hisilicon/zip/zip_main.c       |   17 +-
 drivers/vfio/pci/Kconfig                      |    2 +
 drivers/vfio/pci/Makefile                     |    2 +
 drivers/vfio/pci/hisilicon/Kconfig            |   17 +
 drivers/vfio/pci/hisilicon/Makefile           |    4 +
 .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c    | 1319 +++++++++++++++++
 .../vfio/pci/hisilicon/hisi_acc_vfio_pci.h    |  116 ++
 .../qm.h => include/linux/hisi_acc_qm.h       |   49 +
 include/linux/pci_ids.h                       |    3 +
 16 files changed, 1579 insertions(+), 66 deletions(-)
 create mode 100644 drivers/vfio/pci/hisilicon/Kconfig
 create mode 100644 drivers/vfio/pci/hisilicon/Makefile
 create mode 100644 drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
 create mode 100644 drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h
 rename drivers/crypto/hisilicon/qm.h => include/linux/hisi_acc_qm.h (87%)

-- 
2.25.1