On Wed, Dec 16, 2020 at 02:48:03PM +0800, Jason Wang wrote:
> This patch introduces virtqueue groups to vDPA device. The virtqueue
> group is the minimal set of virtqueues that must share an address
> space. And the adddress space identifier could only be attached to
> a specific virtqueue group.
> 
> A new mandated bus operation is introduced to get the virtqueue group
> ID for a specific virtqueue.
> 
> All the vDPA device drivers were converted to simply support a single
> virtqueue group.
> 
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
>  drivers/vdpa/ifcvf/ifcvf_main.c   |  9 ++++++++-
>  drivers/vdpa/mlx5/net/mlx5_vnet.c |  8 +++++++-
>  drivers/vdpa/vdpa.c               |  4 +++-
>  drivers/vdpa/vdpa_sim/vdpa_sim.c  | 11 ++++++++++-
>  include/linux/vdpa.h              | 12 +++++++++---
>  5 files changed, 37 insertions(+), 7 deletions(-)

Maybe consider calling it iotlb_group or iommu_group so the purpose of
the group is clear?