linux-kernel - [RFC v2 0/2] vfio/pci: wrap pci device as a mediated device

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Date:   Tue, 12 Mar 2019 16:18:21 +0800
From:   "Liu, Yi L" <yi.l.liu@...el.com>
To:     alex.williamson@...hat.com, kwankhede@...dia.com
Cc:     kevin.tian@...el.com, baolu.lu@...ux.intel.com, yi.l.liu@...el.com,
        yi.y.sun@...el.com, joro@...tes.org, jean-philippe.brucker@....com,
        peterx@...hat.com, linux-kernel@...r.kernel.org
Subject: [RFC v2 0/2] vfio/pci: wrap pci device as a mediated device

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