Re: [PATCH 07/10] vfio/mdev: Allow the mdev_parent_ops to specify the device driver to bind

On 6/15/2021 7:05 PM, Christoph Hellwig wrote:

From: Jason Gunthorpe <jgg@nvidia.com>

This allows a mdev driver to opt out of using vfio_mdev.c, instead the
driver will provide a 'struct mdev_driver' and register directly with the
driver core.

Much of mdev_parent_ops becomes unused in this mode:
- create()/remove() are done via the mdev_driver probe()/remove()
- mdev_attr_groups becomes mdev_driver driver.dev_groups
- Wrapper function callbacks are replaced with the same ones from
   struct vfio_device_ops

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
  drivers/vfio/mdev/mdev_core.c   | 30 ++++++++++++++++++++++--------
  drivers/vfio/mdev/mdev_driver.c | 10 ++++++++++
  include/linux/mdev.h            |  2 ++
  3 files changed, 34 insertions(+), 8 deletions(-)

Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com>