Re: [PATCH] iommufd: Enforce IOMMU_RESV_SW_MSI upon hwpt_paging allocation

Jason Gunthorpe
2024-08-01T13:28:57Z

On Wed, Jul 31, 2024 at 11:23:24AM -0700, Nicolin Chen wrote:
> > If we really want to go this route I wonder whether a per-IOMMU
> > get_resv_regions() API should first exist then there is a clear definition
> > what types are per-IOMMU and what are not.
>
> Probably it'd be necessary.

But domains can cross IOMMU's as well, it is not per-iommu you are
after but hardwired per-IOMMU driver type.

What was the issue with trying to fix this on the nesting attach side?

Jason