Re: [PATCH v1 5/5] vfio: Check the presence for iommufd callbacks in __vfio_register_dev()

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> From: Liu, Yi L <yi.l.liu@xxxxxxxxx>
> Sent: Wednesday, March 8, 2023 9:14 PM
> 
> After making the no-DMA drivers (samples/vfio-mdev) providing iommufd
> callbacks, __vfio_register_dev() should check the presence of the iommufd
> callbacks if CONFIG_IOMMUFD is enabled.
> 
> Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
> ---
>  drivers/vfio/vfio_main.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
> index 43bd6b76e2b6..89497c933490 100644
> --- a/drivers/vfio/vfio_main.c
> +++ b/drivers/vfio/vfio_main.c
> @@ -255,8 +255,9 @@ static int __vfio_register_dev(struct vfio_device
> *device,
>  {
>  	int ret;
> 
> -	if (WARN_ON(device->ops->bind_iommufd &&
> -		    (!device->ops->unbind_iommufd ||
> +	if (WARN_ON(IS_ENABLED(CONFIG_IOMMUFD) &&
> +		    (!device->ops->bind_iommufd ||
> +		     !device->ops->unbind_iommufd ||
>  		     !device->ops->attach_ioas)))
>  		return -EINVAL;
> 

I don't think IS_ENABLED() check is necessary. those ops are
defined in the driver side w/o a conditional CONFIG_IOMMUFD.

We should warn out lacking of those ops to the driver developer
as early as possible, instead of postponing it until someone
starts to build kernel with CONFIG_IOMMUFD.




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