[Intel-gfx] [PATCH v2 0/5] vfio: Make emulated devices prepared for vfio device cdev

[Xu, Terrence]

> -----Original Message-----
> From: Liu, Yi L <yi.l.liu at intel.com>
> Sent: Thursday, March 16, 2023 8:15 PM
> 
> The .bind_iommufd op of vfio emulated devices are either empty or does
> nothing. This is different with the vfio physical devices, to add vfio device
> cdev, need to make them act the same.
> 
> This series first makes the .bind_iommufd op of vfio emulated devices to
> create iommufd_access, this introduces a new iommufd API. Then let the
> driver that does not provide .bind_iommufd op to use the vfio emulated
> iommufd op set. This makes all vfio device drivers have consistent iommufd
> operations, which is good for adding new device uAPIs in the device cdev
> series.
> 
> Change log:
> 
> v2:
>  - Add r-b from Kevin and Jason
>  - Refine patch 01 per comments from Jason and Kevin
> 
> v1: https://lore.kernel.org/kvm/20230308131340.459224-1-yi.l.liu@intel.com/
> 
> Thanks,
> 	Yi Liu
> 
> Nicolin Chen (1):
>   iommufd: Create access in vfio_iommufd_emulated_bind()
> 
> Yi Liu (4):
>   vfio-iommufd: No need to record iommufd_ctx in vfio_device
>   vfio-iommufd: Make vfio_iommufd_emulated_bind() return
> iommufd_access
>     ID
>   vfio/mdev: Uses the vfio emulated iommufd ops set in the mdev sample
>     drivers
>   vfio: Check the presence for iommufd callbacks in
>     __vfio_register_dev()
> 
>  drivers/iommu/iommufd/device.c   | 57 ++++++++++++++++++++------------
>  drivers/iommu/iommufd/selftest.c |  8 +++--
>  drivers/vfio/iommufd.c           | 39 +++++++++++-----------
>  drivers/vfio/vfio_main.c         |  5 +--
>  include/linux/iommufd.h          |  5 +--
>  include/linux/vfio.h             |  1 -
>  samples/vfio-mdev/mbochs.c       |  3 ++
>  samples/vfio-mdev/mdpy.c         |  3 ++
>  samples/vfio-mdev/mtty.c         |  3 ++
>  9 files changed, 76 insertions(+), 48 deletions(-)
> 
> --
> 2.34.1
Verified this series by test the vfio-mdev with mtty emulated device, it passed VFIO legacy mode / compat mode / cdev mode, including negative tests.

Tested-by: Terrence Xu <terrence.xu at intel.com>