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Subject[RFC v2 0/2] vfio/pci: wrap pci device as a mediated device
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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.

Previous RFC v1 has given two proposals and the discussion could
be found in following link. Per the comments, this patchset adds
a separate driver named vfio-pci-mdev. It leverages some symbols
from existing vfio-pci. When device is bound to vfio-pci-mdev
driver, it would be wrapped as a mediated device. And user should
create a mdev on this device via the mdev interface exposed to
user.
https://lkml.org/lkml/2019/3/4/529

The new vfio-pci-mdev driver could be used to verify the vfio
changes in "vfio/mdev: IOMMU aware mediated device". Besides,
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"


Links:
*) Link of "vfio/mdev: IOMMU aware mediated device"
https://lwn.net/Articles/780522/

Please feel free give your comments.

Thanks,
Yi Liu

Change log:
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 (2):
vfio/pci: export common symbols in vfio-pci
vfio/pci: add vfio-pci-mdev driver

drivers/vfio/pci/Kconfig | 11 ++
drivers/vfio/pci/Makefile | 5 +
drivers/vfio/pci/vfio_pci.c | 101 ++++++-----
drivers/vfio/pci/vfio_pci_mdev.c | 334 ++++++++++++++++++++++++++++++++++++
drivers/vfio/pci/vfio_pci_private.h | 17 ++
5 files changed, 428 insertions(+), 40 deletions(-)
create mode 100644 drivers/vfio/pci/vfio_pci_mdev.c

--
2.7.4

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