[PATCH v2 0/7] vfio-ccw parent rework

[Eric Farman]

Hi all,

Here is an update to the vfio-ccw lifecycle changes that have been discussed
in various forms over the past year [1][2] or so, and which I dusted off
recently.

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/

v1->v2:
 - Rebase to 6.1-rc3
 - Patch 1:
   [EF] s/device_initialize/device_register/ and associated adjustments
   [MR] Add WARN_ON(!private) in vfio_ccw_sch_quiesce()
   [MR] Move struct vfio_ccw_parent to _private.h, instead of standalone file
 - Patch 2:
   [MR] Added r-b (Thank you!)
 - Patch 3:
   [MR] Update commit message to point to introduction of private->release_comp
   [MR] Replace the remnants of vfio_ccw_alloc_private with a straight kzalloc
   [MR] Added r-b (Thank you!)
 - Patch 5:
   [KT] Added r-b (Thank you!)
 - Patch 6:
   [JG] Make vfio_init_device static
   [KT] Added r-b (Thank you!)
 - Patch 7:
   [JG, KT] Added r-b (Thank you!)
v1: https://lore.kernel.org/kvm/20221019162135.798901-1-farman@linux.ibm.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       | 174 +++++++++++---------------
 drivers/s390/cio/vfio_ccw_fsm.c       |  27 ++--
 drivers/s390/cio/vfio_ccw_ops.c       | 107 +++++++++++-----
 drivers/s390/cio/vfio_ccw_private.h   |  37 ++++--
 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              |  32 ++---
 include/linux/vfio.h                  |   3 -
 samples/vfio-mdev/mbochs.c            |   1 -
 samples/vfio-mdev/mdpy.c              |   1 -
 samples/vfio-mdev/mtty.c              |   1 -
 16 files changed, 197 insertions(+), 202 deletions(-)

-- 
2.34.1