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SubjectRE: [PATCH v3 00/10] vfio_pci: wrap pci device as a mediated device
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Hi Alex,

Any comments on this version? If any, please feel free let me know.

Regards,
Yi Liu

> From: Liu, Yi L <yi.l.liu@intel.com>
> Sent: Thursday, November 21, 2019 7:24 PM
> To: alex.williamson@redhat.com; kwankhede@nvidia.com
> Subject: [PATCH v3 00/10] 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. 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
> *) patch 10: refine the sample driver
>
> Links:
> *) Link of "vfio/mdev: IOMMU aware mediated device"
> https://lwn.net/Articles/780522/
> *) Previous versions:
> 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 : v5.4-rc7-pci-mdev
>
> Please feel free give your comments.
>
> Thanks,
> Yi Liu
>
> Change log:
> 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 (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
> samples: add vfio-mdev-pci driver
>
> drivers/vfio/pci/Makefile | 9 +-
> drivers/vfio/pci/vfio_mdev_pci.c | 430 ++++++++++
> drivers/vfio/pci/vfio_pci.c | 1460 +---------------------------------
> drivers/vfio/pci/vfio_pci_common.c | 1471
> +++++++++++++++++++++++++++++++++++
> drivers/vfio/pci/vfio_pci_config.c | 33 +-
> drivers/vfio/pci/vfio_pci_private.h | 39 +
> samples/Kconfig | 11 +
> 7 files changed, 2000 insertions(+), 1453 deletions(-)
> create mode 100644 drivers/vfio/pci/vfio_mdev_pci.c
> create mode 100644 drivers/vfio/pci/vfio_pci_common.c
>
> --
> 2.7.4

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