Re: [PATCH 4/5] iommu: Support mm PASID 1:n with sva domains

Jason Gunthorpe
2023-08-08T16:02:29Z

On Tue, Aug 08, 2023 at 12:12:42PM -0300, Jason Gunthorpe wrote:

> Lets please rework this function into two parts
>
> The first should be 'iommu_sva_alloc_domain()'
>
> It should do the list searching and user management. The usual
> 'iommu_domain_free()' should be modified to clean it up.

I suppose we can't quite do this fully since the domain allocation
needs to use set_dev_pasid to detect compatability :( This is a
similar problem we had with iommufd too.

Still, the 'alloc and set_dev_pasid' should be in one function and it
should be undone with iommu_detach_device_pasid() and
iommu_domain_free().

The helper bind/unbind functions should wrapper that sequence.

Jason