linux-kernel - RE: [PATCH v3 00/10] vfio_pci: wrap pci device as a mediated device

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Date:   Mon, 9 Dec 2019 11:49:21 +0000
From:   "Liu, Yi L" <yi.l.liu@...el.com>
To:     "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "kwankhede@...dia.com" <kwankhede@...dia.com>
CC:     "Tian, Kevin" <kevin.tian@...el.com>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "Sun, Yi Y" <yi.y.sun@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "jean-philippe.brucker@....com" <jean-philippe.brucker@....com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: RE: [PATCH v3 00/10] vfio_pci: wrap pci device as a mediated device

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@...el.com>
> Sent: Thursday, November 21, 2019 7:24 PM
> To: alex.williamson@...hat.com; kwankhede@...dia.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