linux-kernel - Re: [RFC v3 0/3] vfio_pci: wrap pci device as a mediated device

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Message-ID: <20190523070311.4f95ca5c@x1.home>
Date:   Thu, 23 May 2019 07:03:11 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     "Liu, Yi L" <yi.l.liu@...el.com>
Cc:     "kwankhede@...dia.com" <kwankhede@...dia.com>,
        "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>,
        "yamada.masahiro@...ionext.com" <yamada.masahiro@...ionext.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
Subject: Re: [RFC v3 0/3] vfio_pci: wrap pci device as a mediated device

On Thu, 23 May 2019 08:44:57 +0000
"Liu, Yi L" <yi.l.liu@...el.com> wrote:

> Hi Alex,
> 
> Sorry to disturb you. Do you want to review on this version or review a rebased version? :-) If rebase version is better, I can try to do it asap.

Hi Yi,

Perhaps you missed my comments on 1/3:

https://www.spinics.net/lists/kvm/msg187282.html

In summary, it looks pretty good, but consider a file name more
consistent with the existing files and prune out the code changes from
the code moves so they can be reviewed more easily.  Thanks,

Alex

> > -----Original Message-----
> > From: Liu, Yi L
> > Sent: Tuesday, April 23, 2019 8:15 PM
> > To: alex.williamson@...hat.com; kwankhede@...dia.com
> > Cc: Tian, Kevin <kevin.tian@...el.com>; baolu.lu@...ux.intel.com; Liu, Yi L
> > <yi.l.liu@...el.com>; Sun, Yi Y <yi.y.sun@...el.com>; joro@...tes.org; jean-
> > philippe.brucker@....com; peterx@...hat.com; linux-kernel@...r.kernel.org;
> > kvm@...r.kernel.org; yamada.masahiro@...ionext.com; iommu@...ts.linux-
> > foundation.org
> > Subject: [RFC v3 0/3] 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-
> > mdev-pci. It is a sample driver, but loactes in drivers/vfio/pci due to code sharing
> > consideration.
> > The corresponding Kconfig definition is in samples/Kconfig.
> > 
> > https://lkml.org/lkml/2019/3/4/529
> > 
> > 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"
> > 
> > 
> > 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:
> >   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
> > 
> >   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 (3):
> >   vfio_pci: split vfio_pci.c into two source files
> >   vfio/pci: protect cap/ecap_perm bits alloc/free with atomic op
> >   smaples: add vfio-mdev-pci driver
> > 
> >  drivers/vfio/pci/Makefile           |    7 +-
> >  drivers/vfio/pci/common.c           | 1511 +++++++++++++++++++++++++++++++++++
> >  drivers/vfio/pci/vfio_mdev_pci.c    |  386 +++++++++
> >  drivers/vfio/pci/vfio_pci.c         | 1476 +---------------------------------
> >  drivers/vfio/pci/vfio_pci_config.c  |    9 +
> >  drivers/vfio/pci/vfio_pci_private.h |   27 +
> >  samples/Kconfig                     |   11 +
> >  7 files changed, 1962 insertions(+), 1465 deletions(-)  create mode 100644
> > drivers/vfio/pci/common.c  create mode 100644 drivers/vfio/pci/vfio_mdev_pci.c
> > 
> > --
> > 2.7.4  
>