> From: Christoph Hellwig <hch@xxxxxx>
> Sent: Thursday, August 26, 2021 12:19 AM
>
> Unlike the the type1 IOMMU backend, the SPAPR one does not contain any
> support for the magic non-IOMMU backed iommu_group used by mediated
> devices, so reject them in ->attach_group.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
> ---
> drivers/vfio/vfio_iommu_spapr_tce.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c
> b/drivers/vfio/vfio_iommu_spapr_tce.c
> index 7567328d347d25..0fbce1bcb6493b 100644
> --- a/drivers/vfio/vfio_iommu_spapr_tce.c
> +++ b/drivers/vfio/vfio_iommu_spapr_tce.c
> @@ -1246,6 +1246,9 @@ static int tce_iommu_attach_group(void
> *iommu_data,
> struct iommu_table_group *table_group;
> struct tce_iommu_group *tcegrp = NULL;
>
> + if (flags & VFIO_EMULATED_IOMMU)
> + return -EINVAL;
> +
> mutex_lock(&container->lock);
>
> /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n",
> --
> 2.30.2
