linux-kernel - Re: [PATCH v14 00/22] Add Mediated device support

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Date:   Fri, 18 Nov 2016 08:40:20 -0700
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Zhenyu Wang <zhenyuw@...ux.intel.com>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "kraxel@...hat.com" <kraxel@...hat.com>,
        "cjia@...dia.com" <cjia@...dia.com>,
        "qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Song, Jike" <jike.song@...el.com>,
        "bjsdjshi@...ux.vnet.ibm.com" <bjsdjshi@...ux.vnet.ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v14 00/22] Add Mediated device support

On Fri, 18 Nov 2016 17:16:32 +0800
Zhenyu Wang <zhenyuw@...ux.intel.com> wrote:

> On 2016.11.17 16:51:45 -0700, Alex Williamson wrote:
> > On Thu, 17 Nov 2016 23:29:38 +0000
> > "Tian, Kevin" <kevin.tian@...el.com> wrote:
> >   
> > > > From: Alex Williamson [mailto:alex.williamson@...hat.com]
> > > > Sent: Friday, November 18, 2016 5:25 AM
> > > > 
> > > > On Thu, 17 Nov 2016 02:16:12 +0530
> > > > Kirti Wankhede <kwankhede@...dia.com> wrote:    
> > > > >
> > > > >  Documentation/ABI/testing/sysfs-bus-vfio-mdev |  111 ++
> > > > >  Documentation/vfio-mediated-device.txt        |  399 +++++++
> > > > >  MAINTAINERS                                   |    9 +
> > > > >  drivers/vfio/Kconfig                          |    1 +
> > > > >  drivers/vfio/Makefile                         |    1 +
> > > > >  drivers/vfio/mdev/Kconfig                     |   17 +
> > > > >  drivers/vfio/mdev/Makefile                    |    5 +
> > > > >  drivers/vfio/mdev/mdev_core.c                 |  385 +++++++
> > > > >  drivers/vfio/mdev/mdev_driver.c               |  119 ++
> > > > >  drivers/vfio/mdev/mdev_private.h              |   41 +
> > > > >  drivers/vfio/mdev/mdev_sysfs.c                |  286 +++++
> > > > >  drivers/vfio/mdev/vfio_mdev.c                 |  180 +++
> > > > >  drivers/vfio/pci/vfio_pci.c                   |   83 +-
> > > > >  drivers/vfio/platform/vfio_platform_common.c  |   31 +-
> > > > >  drivers/vfio/vfio.c                           |  340 +++++-
> > > > >  drivers/vfio/vfio_iommu_type1.c               |  872 +++++++++++---
> > > > >  include/linux/mdev.h                          |  177 +++
> > > > >  include/linux/vfio.h                          |   32 +-
> > > > >  include/uapi/linux/vfio.h                     |   10 +
> > > > >  samples/vfio-mdev/Makefile                    |   13 +
> > > > >  samples/vfio-mdev/mtty.c                      | 1503    
> > > > +++++++++++++++++++++++++    
> > > > >  21 files changed, 4358 insertions(+), 257 deletions(-)
> > > > >  create mode 100644 Documentation/ABI/testing/sysfs-bus-vfio-mdev
> > > > >  create mode 100644 Documentation/vfio-mediated-device.txt
> > > > >  create mode 100644 drivers/vfio/mdev/Kconfig
> > > > >  create mode 100644 drivers/vfio/mdev/Makefile
> > > > >  create mode 100644 drivers/vfio/mdev/mdev_core.c
> > > > >  create mode 100644 drivers/vfio/mdev/mdev_driver.c
> > > > >  create mode 100644 drivers/vfio/mdev/mdev_private.h
> > > > >  create mode 100644 drivers/vfio/mdev/mdev_sysfs.c
> > > > >  create mode 100644 drivers/vfio/mdev/vfio_mdev.c
> > > > >  create mode 100644 include/linux/mdev.h
> > > > >  create mode 100644 samples/vfio-mdev/Makefile
> > > > >  create mode 100644 samples/vfio-mdev/mtty.c    
> > > > 
> > > > As discussed, I dropped patch 12, updated the documentation, and added
> > > > 'retries' initialization.  This is now applied to my next branch for
> > > > v4.10.  Thanks to the reviewers and Kirti and Neo for your hard work!
> > > > Thanks,
> > > >     
> > > 
> > > That's a great news! Alex, do you have an idea when this series may
> > > hit linux-next? :-)  
> > 
> > Whenever there's a new build, hopefully within the next 24hrs, but I
> > don't really know the schedule.  Thanks,
> >   
> 
> Alex, could you do a pull request of mdev for Daniel's drm-intel tree?
> We need to send KVMGT mdev support pull base on that.

No, this is not how I intend or prefer to merge this.  This is a large
change for vfio and it is not exclusive to KVMGT.  We have linux-next
to facilitate handling dependencies between subsystems during
development and a two week merge window to allow managing how these
changes enter the mainline tree.  If I were to have this pulled into
drm-intel it ties my hands as to how I can manage changes within my
functional area.  I want these two weeks of linux-next exposure for
vetting the changes and resolving any remaining issues.  I'm not going
to compromise my ability to react to such issues.  linux-next inclusion
should be sufficient for you to coordinate through the drm tree, though
Daniel will need to be made aware of the dependency.  I will however
plan to send my pull request to Linus early in the merge window to
accommodate dependent changes also being included for v4.10. Hope
you understand, thanks,

Alex