[PATCH v1 0/9] vfio_pci: wrap pci device as a mediated device

[Liu Yi L <yi.l.liu@intel.com>]

This patchset aims to add a vfio-pci-like meta driver as a demo
user of the vfio changes introduced in "vfio/mdev: IOMMU aware
mediated device" patchset from Baolu Lu. Besides the test purpose,
per Alex's comments, it could also be a good base driver for
experimenting with device specific mdev migration.

Specific interface tested in this proposal:
 *) int mdev_set_iommu_device(struct device *dev,
 				struct device *iommu_device)
    introduced in the patch as below:
    "[PATCH v5 6/8] vfio/mdev: Add iommu related member in mdev_device"

Patch Overview:
 *) patch 1 ~ 7: code refactor for existing vfio-pci module
                 move the common codes from vfio_pci.c to
                 vfio_pci_common.c
 *) patch 8: add protection to perm_bits alloc/free
 *) patch 9: add vfio-mdev-pci sample driver

Links:
 *) Link of "vfio/mdev: IOMMU aware mediated device"
         https://lwn.net/Articles/780522/
 *) Previous versions:
         RFC v1: https://lkml.org/lkml/2019/3/4/529
         RFC v2: https://lkml.org/lkml/2019/3/13/113
         RFC v3: https://lkml.org/lkml/2019/4/24/495
 *) may try it with the codes in below repo
    current version is branch "v5.2-rc3-pci-mdev":
         https://github.com/luxis1999/vfio-mdev-pci-sample-driver.git

Please feel free give your comments.

Thanks,
Yi Liu

Change log:
  RFC v3 -> patch v1:
  - split the patchset from 3 patches to 9 patches to better demonstrate
    the changes step by step

  v2->v3:
  - use vfio-mdev-pci instead of vfio-pci-mdev
  - place the new driver under drivers/vfio/pci while define
    Kconfig in samples/Kconfig to clarify it is a sample driver

  v1->v2:
  - instead of adding kernel option to existing vfio-pci
    module in v1, v2 follows Alex's suggestion to add a
    separate vfio-pci-mdev module.
  - new patchset subject: "vfio/pci: wrap pci device as a mediated device"

Liu Yi L (9):
  vfio_pci: move vfio_pci_is_vga/vfio_vga_disabled to header
  vfio_pci: refine user config reference in vfio-pci module
  vfio_pci: refine vfio_pci_driver reference in vfio_pci.c
  vfio_pci: make common functions be extern
  vfio_pci: duplicate vfio_pci.c
  vfio_pci: shrink vfio_pci_common.c
  vfio_pci: shrink vfio_pci.c
  vfio/pci: protect cap/ecap_perm bits alloc/free with atomic op
  smaples: add vfio-mdev-pci driver

 drivers/vfio/pci/Makefile           |    9 +-
 drivers/vfio/pci/vfio_mdev_pci.c    |  403 ++++++++++
 drivers/vfio/pci/vfio_pci.c         | 1449 +---------------------------------
 drivers/vfio/pci/vfio_pci_common.c  | 1458 +++++++++++++++++++++++++++++++++++
 drivers/vfio/pci/vfio_pci_config.c  |    9 +
 drivers/vfio/pci/vfio_pci_private.h |   36 +
 samples/Kconfig                     |   11 +
 7 files changed, 1933 insertions(+), 1442 deletions(-)
 create mode 100644 drivers/vfio/pci/vfio_mdev_pci.c
 create mode 100644 drivers/vfio/pci/vfio_pci_common.c

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2.7.4