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
