RE: [PATCH v2 0/4] Make the iommu driver no-snoop block feature consistent

Tian, Kevin
2022-04-12T02:51:28Z

> From: Robin Murphy <robin.murphy@arm.com>
> Sent: Saturday, April 9, 2022 1:45 AM
>
> >
> > So, I suppose VFIO would want to attach/detatch on every vfio_device
> > individually and it would iterate over the group instead of doing a
> > list_first_entry() like above. This would not be hard to do in VFIO.
>
> It feels like we've already beaten that discussion to death in other
> threads; regardless of what exact argument the iommu_attach/detach
> operations end up taking, they have to operate on the whole (explicit or
> implicit) iommu_group at once, because doing anything else would defeat
> the point of isolation groups, and be impossible for alias groups.
>

Could you add a few words about what is 'alias group'?