Re: [PATCH v4 00/12] Initial support for SMMUv3 nested translation

Jason Gunthorpe
2025-01-22T19:26:27Z

On Fri, Nov 15, 2024 at 01:55:22PM -0400, Jason Gunthorpe wrote:
> > > I need your help to remove IOMMU_DEV_FEAT_IOPF from the intel
> > > driver. I have a patch series that eliminates it from all the other
> > > drivers, and I wrote a patch to remove FEAT_SVA from intel..
> >
> > Yes, sure. Let's make this happen in the next cycle.
> >
> > FEAT_IOPF could be removed. IOPF manipulation can be handled in the
> > domain attachment path. A per-device refcount can be implemented. This
> > count increments with each iopf-capable domain attachment and decrements
> > with each detachment. PCI PRI is enabled for the first iopf-capable
> > domain and disabled when the last one is removed. Probably we can also
> > solve the PF/VF sharing PRI issue.
>
> Here is what I have so far, if you send me a patch for vt-d to move
> FEAT_IOPF into attach as you describe above (see what I did to arm for
> example), then I can send it next cycle
>
> https://github.com/jgunthorpe/linux/commits/iommu_no_feat/

Hey Baolu, a reminder on this, lets try for it next cycle?

Thanks,
Jason