[Intel-gfx] [PATCH v1 4/5] Samples/mdev: Uses the vfio emulated iommufd ops set in the mdev sample drivers

[Jason Gunthorpe]

On Wed, Mar 08, 2023 at 05:13:39AM -0800, Yi Liu wrote:
> This harmonizes the no-DMA devices (the vfio-mdev sample drivers) with
> the emulated devices (gvt-g, vfio-ap etc.). It makes it easier to add
> BIND_IOMMUFD user interface which requires to return an iommufd ID to
> represent the device/iommufd bond.
> 
> Signed-off-by: Yi Liu <yi.l.liu at intel.com>
> ---
>  drivers/vfio/iommufd.c     | 14 ++++++--------
>  samples/vfio-mdev/mbochs.c |  3 +++
>  samples/vfio-mdev/mdpy.c   |  3 +++
>  samples/vfio-mdev/mtty.c   |  3 +++
>  4 files changed, 15 insertions(+), 8 deletions(-)

Subject should be 'vfio/mdev: ..'

> @@ -119,7 +115,8 @@ EXPORT_SYMBOL_GPL(vfio_iommufd_physical_attach_ioas);
>  /*
>   * The emulated standard ops mean that vfio_device is going to use the
>   * "mdev path" and will call vfio_pin_pages()/vfio_dma_rw(). Drivers using this
> - * ops set should call vfio_register_emulated_iommu_dev().
> + * ops set should call vfio_register_emulated_iommu_dev(). Drivers that do
> + * not call vfio_pin_pages()/vfio_dma_rw() no need to provide dma_unmap.
>   */

'have no need'

Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>

Jason