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

Liu Yi L
2019-06-09T13:38:47Z

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