Re: [RFC v2 0/4] adding mdev bus and vfio support

[Neo Jia <cjia@nvidia.com>]

On Fri, Sep 02, 2016 at 09:03:52AM -0600, Alex Williamson wrote:
> On Fri,  2 Sep 2016 16:16:08 +0800
> Jike Song <jike.song@intel.com> wrote:
> 
> > This patchset is based on NVidia's "Add Mediated device support" series, version 6:
> > 
> > 	http://www.spinics.net/lists/kvm/msg136472.html
> 
> 
> Hi Jike,
> 
> I'm thrilled by your active participation here, but I'm confused which
> versions I should be reviewing and where the primary development is
> going.  Kirti sent v7 a week ago, so I would have expected a revision
> based on that rather than a re-write based on v6 plus incorporation of a
> few of Kirti's patches directly.  I liked the last version of these
> changes a lot, but we need to figure out how to combine development
> because we do not have infinite cycles for review available :-\  Thanks!

Agree with Alex, and the primary development is on Kirti's v7 patches thread.

Jike, could you please join us in the existing code review thread?

I know you are already there with the sysfs discussion recently, but I would
like to see your comments on the rest stuff so we can know how to best
accommodate your requirements and needs in the future revisions.

I believe that would be the best and fastest way to collaborate and that is the 
main purpose of having code review cycles.

Thanks,
Neo

> 
> Alex
> 
> > 
> > 
> > Key Changes from Nvidia v6:
> > 
> > 	- Introduced an independent struct device to host device, thereby
> > 	  formed a physical-host-mdev hierarchy, and highly reused Linux
> > 	  driver core support;
> > 
> > 	- Added online/offline to mdev_bus_type, leveraging the 'online'
> > 	  attr support from Linux driver core;
> > 
> > 	- Removed mdev_class and other unecessary stuff;
> > 
> > 	/*
> > 	 * Given the changes above, the code volume of mdev core driver
> > 	 * dramatically reduced by ~50%.
> > 	 */
> > 
> > 
> > 	- Interfaces between vfio_mdev and vendor driver are high-level,
> > 	  e.g. ioctl instead of get_irq_info/set_irq_info and reset,
> > 	  start/stop became mdev oriented, etc.;
> > 
> > 	/*
> > 	 * Given the changes above, the code volume of mdev core driver
> > 	 * dramatically reduced by ~64%.
> > 	 */
> > 
> > 
> > Test
> > 
> > 	- Tested with KVMGT
> > 
> > TODO
> > 
> > 	- Re-implement the attribute group of host device as long as the
> > 	  sysfs hierarchy in discussion gets finalized;
> > 
> > 	- Move common routines from current vfio-pci into a higher location,
> > 	  export them for various VFIO bus drivers and/or mdev vendor drivers;
> > 
> > 	- Add implementation examples for vendor drivers to Documentation;
> > 
> > 	- Refine IOMMU changes
> > 
> > 
> > 
> > Jike Song (2):
> >   Mediated device Core driver
> >   vfio: VFIO bus driver for MDEV devices
> > 
> > Kirti Wankhede (2):
> >   vfio iommu: Add support for mediated devices
> >   docs: Add Documentation for Mediated devices
> > 
> >  Documentation/vfio-mediated-device.txt | 203 ++++++++++++++
> >  drivers/vfio/Kconfig                   |   1 +
> >  drivers/vfio/Makefile                  |   1 +
> >  drivers/vfio/mdev/Kconfig              |  18 ++
> >  drivers/vfio/mdev/Makefile             |   5 +
> >  drivers/vfio/mdev/mdev_core.c          | 250 +++++++++++++++++
> >  drivers/vfio/mdev/mdev_driver.c        | 155 ++++++++++
> >  drivers/vfio/mdev/mdev_private.h       |  29 ++
> >  drivers/vfio/mdev/mdev_sysfs.c         | 155 ++++++++++
> >  drivers/vfio/mdev/vfio_mdev.c          | 187 ++++++++++++
> >  drivers/vfio/vfio.c                    |  82 ++++++
> >  drivers/vfio/vfio_iommu_type1.c        | 499 +++++++++++++++++++++++++++++----
> >  include/linux/mdev.h                   | 159 +++++++++++
> >  include/linux/vfio.h                   |  13 +-
> >  14 files changed, 1709 insertions(+), 48 deletions(-)
> >  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
> > 
>