[PATCH 0/5] Update vfio_group to use the modern cdev lifecycle

From: Jason Gunthorpe <jgg@nvidia.com>
To: Alex Williamson <alex.williamson@redhat.com>,
	Cornelia Huck <cohuck@redhat.com>,
	kvm@vger.kernel.org
Cc: Christoph Hellwig <hch@lst.de>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	Liu Yi L <yi.l.liu@intel.com>
Subject: [PATCH 0/5] Update vfio_group to use the modern cdev lifecycle
Date: Fri,  1 Oct 2021 20:22:19 -0300	[thread overview]
Message-ID: <0-v1-fba989159158+2f9b-vfio_group_cdev_jgg@nvidia.com> (raw)

These days drivers with state should use cdev_device_add() and
cdev_device_del() to manage the cdev and sysfs lifetime. This simple
pattern ties all the state (vfio, dev, and cdev) together in one memory
structure and uses container_of() to navigate between the layers.

This is a followup to the discussion here:

https://lore.kernel.org/kvm/20210921155705.GN327412@nvidia.com/

This builds on Christoph's work to revise how the vfio_group works and is
against the latest VFIO tree.

Jason Gunthorpe (5):
  vfio: Delete vfio_get/put_group from vfio_iommu_group_notifier()
  vfio: Do not open code the group list search in vfio_create_group()
  vfio: Don't leak a group reference if the group already exists
  vfio: Use a refcount_t instead of a kref in the vfio_group
  vfio: Use cdev_device_add() instead of device_create()

 drivers/vfio/vfio.c | 363 +++++++++++++++++---------------------------
 1 file changed, 140 insertions(+), 223 deletions(-)

base-commit: d9a0cd510c3383b61db6f70a84e0c3487f836a63
-- 
2.33.0