linux-kernel - [PATCH v1 0/7] vfio-ccw parent rework

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Message-Id: <20221019162135.798901-1-farman@linux.ibm.com>
Date:   Wed, 19 Oct 2022 18:21:28 +0200
From:   Eric Farman <farman@...ux.ibm.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Kevin Tian <kevin.tian@...el.com>, Yi Liu <yi.l.liu@...el.com>
Cc:     Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Vineeth Vijayan <vneethv@...ux.ibm.com>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Tony Krowiak <akrowiak@...ux.ibm.com>,
        Jason Herne <jjherne@...ux.ibm.com>,
        Harald Freudenberger <freude@...ux.ibm.com>,
        Diana Craciun <diana.craciun@....nxp.com>,
        Eric Auger <eric.auger@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Abhishek Sahu <abhsahu@...dia.com>,
        Yishai Hadas <yishaih@...dia.com>,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org, Eric Farman <farman@...ux.ibm.com>
Subject: [PATCH v1 0/7] vfio-ccw parent rework

Hi all,

There have been discussions and attempts [1][2] to rework the vfio-ccw device
lifecycle to better align with the needs/expectations of vfio and mdev.
While those languished, commit cb9ff3f3b84c ("vfio: Add helpers for unifying
vfio_device life cycle") implemented a couple of tricks that help vfio and the
drivers that interact with it, while keeping vfio-ccw as-is. A handful of
commits titled "vfio/xxx: Use the new device life cycle helpers" implemented
those tricks for each of the drivers.

This series attempts to address the oddities/shortcomings of vfio-ccw, such
that vfio-ccw can use the same helpers as everyone else, and the tricks that
were implemented by the other drivers can be removed. It is built on 6.1-rc1,
and thus includes the various changes [3][4] that have occurred in and around
these parts.

Patches 1-5 rework the behavior of the vfio-ccw driver's private struct.
In summary, the mdev pieces are split out of vfio_ccw_private and into a
new vfio_ccw_parent struct that will continue to follow today's lifecycle.
The remainder (bulk) of the private struct moves to follow the mdev
probe/remove pair. There's opportunity for further separation of the
things in the private struct, which would simplify some of the vfio-ccw
code, but it got too hairy as I started that. Once vfio-ccw is no longer
considered unique, those cleanups can happen at our leisure. 

Patch 6 removes the trickery where vfio-ccw uses vfio_init_device instead of
vfio_alloc_device, and thus removes vfio_init_device from the outside world.

Patch 7 removes vfio_free_device from vfio-ccw and the other drivers (hello,
CC list!), letting it be handled by vfio_device_release directly.

Looking forward to the feedback.

Thanks,
Eric

[1] https://lore.kernel.org/kvm/0-v3-57c1502c62fd+2190-ccw_mdev_jgg@nvidia.com/
[2] https://lore.kernel.org/kvm/20220602171948.2790690-1-farman@linux.ibm.com/
[3] https://lore.kernel.org/kvm/20220923092652.100656-1-hch@lst.de/
[4] https://lore.kernel.org/kvm/20220921104401.38898-1-kevin.tian@intel.com/

Eric Farman (7):
  vfio/ccw: create a parent struct
  vfio/ccw: remove private->sch
  vfio/ccw: move private initialization to callback
  vfio/ccw: move private to mdev lifecycle
  vfio/ccw: remove release completion
  vfio/ccw: replace vfio_init_device with _alloc_
  vfio: Remove vfio_free_device

 drivers/gpu/drm/i915/gvt/kvmgt.c      |   1 -
 drivers/s390/cio/vfio_ccw_chp.c       |   5 +-
 drivers/s390/cio/vfio_ccw_drv.c       | 182 ++++++++++----------------
 drivers/s390/cio/vfio_ccw_fsm.c       |  27 ++--
 drivers/s390/cio/vfio_ccw_ops.c       | 108 ++++++++++-----
 drivers/s390/cio/vfio_ccw_parent.h    |  28 ++++
 drivers/s390/cio/vfio_ccw_private.h   |  22 ++--
 drivers/s390/crypto/vfio_ap_ops.c     |   6 -
 drivers/vfio/fsl-mc/vfio_fsl_mc.c     |   1 -
 drivers/vfio/pci/vfio_pci_core.c      |   1 -
 drivers/vfio/platform/vfio_amba.c     |   1 -
 drivers/vfio/platform/vfio_platform.c |   1 -
 drivers/vfio/vfio_main.c              |  25 +---
 include/linux/vfio.h                  |   1 -
 samples/vfio-mdev/mbochs.c            |   1 -
 samples/vfio-mdev/mdpy.c              |   1 -
 samples/vfio-mdev/mtty.c              |   1 -
 17 files changed, 204 insertions(+), 208 deletions(-)
 create mode 100644 drivers/s390/cio/vfio_ccw_parent.h

-- 
2.34.1