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    Subject[PATCH v4 00/12] vfio_pci: wrap pci device as a mediated device
    Date
    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 ~ 9: code refactor for existing vfio-pci module
    move the common codes from vfio_pci.c to
    vfio_pci_common.c
    *) patch 10: build vfio-pci-common.ko
    *) patch 11: add initial vfio-mdev-pci sample driver
    *) patch 12: refine the sample driver

    Links:
    *) Link of "vfio/mdev: IOMMU aware mediated device"
    https://lwn.net/Articles/780522/
    *) Previous versions:
    Patch v3: https://lkml.org/lkml/2019/11/22/1558
    Patch v2: https://lkml.org/lkml/2019/9/6/115
    Patch v1: https://www.spinics.net/lists/kvm/msg188952.html
    RFC v3: https://lkml.org/lkml/2019/4/24/495
    RFC v2: https://lkml.org/lkml/2019/3/13/113
    RFC v1: https://lkml.org/lkml/2019/3/4/529
    *) may try it with the codes in below repo
    https://github.com/luxis1999/vfio-mdev-pci-sample-driver.git : v5.5-rc5-pci-mdev

    Please feel free give your comments.

    Thanks,
    Yi Liu

    Change log:
    patch v3 -> patch v4:
    - switched the sequence of
    "vfio_pci: move vfio_pci_is_vga/vfio_vga_disabled to header"
    and
    "vfio_pci: refine user config reference in vfio-pci module".
    - refined "vfio_pci: refine vfio_pci_driver reference in vfio_pci.c"
    per Alex's comments.
    - split the vfio_pci_private.h file to be two files.
    - Build vfio_pci_common.c to be vfio-pci-common.ko for code sharing
    outside of drivers/vfio/pci/.
    - moved vfio-mdev-pci driver to under samples/.
    - dropped "vfio/pci: protect cap/ecap_perm bits alloc/free" as new
    version builds vfio_pci_common.c to be a kernel module.

    patch v2 -> patch v3:
    - refresh the disable_idle_d3, disable_vga and nointxmask config
    according to user config in device open.
    - add a semaphore around the vfio-pci cap/ecap perm bits allocation/free
    - drop the non-singleton iommu group support to keep it simple as it's
    a sample driver for now.

    patch v1 -> patch v2:
    - the sample driver implementation refined
    - the sample driver can work on non-singleton iommu groups
    - the sample driver can work with vfio-pci, devices from a non-singleton
    group can either be bound to vfio-mdev-pci or vfio-pci, and the
    assignment of this group still follows current vfio assignment rule.

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

    rfc 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

    rfc 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"

    Alex Williamson (1):
    samples: refine vfio-mdev-pci driver

    Liu Yi L (11):
    vfio_pci: refine user config reference in vfio-pci module
    vfio_pci: move vfio_pci_is_vga/vfio_vga_disabled to header file
    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: duplicate vfio_pci_private.h to include/linux
    vfio: split vfio_pci_private.h into two files
    vfio: build vfio_pci_common.c into a kernel module
    samples: add vfio-mdev-pci driver

    drivers/vfio/pci/Kconfig | 9 +-
    drivers/vfio/pci/Makefile | 10 +-
    drivers/vfio/pci/vfio_pci.c | 1477 +-------------------------------
    drivers/vfio/pci/vfio_pci_common.c | 1512 +++++++++++++++++++++++++++++++++
    drivers/vfio/pci/vfio_pci_private.h | 94 +-
    include/linux/vfio_pci_common.h | 154 ++++
    samples/Kconfig | 10 +
    samples/Makefile | 1 +
    samples/vfio-mdev-pci/Makefile | 4 +
    samples/vfio-mdev-pci/vfio_mdev_pci.c | 420 +++++++++
    10 files changed, 2128 insertions(+), 1563 deletions(-)
    create mode 100644 drivers/vfio/pci/vfio_pci_common.c
    create mode 100644 include/linux/vfio_pci_common.h
    create mode 100644 samples/vfio-mdev-pci/Makefile
    create mode 100644 samples/vfio-mdev-pci/vfio_mdev_pci.c

    --
    2.7.4

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