Re: [PATCH 2/2] iommu/sva: Remove mm parameter from SVA bind API

Jason Gunthorpe
2021-04-14T11:26:10Z

On Wed, Apr 14, 2021 at 02:22:09PM +0800, Lu Baolu wrote:

> I still worry about supervisor pasid allocation.
>
> If we use iommu_sva_alloc_pasid() to allocate a supervisor pasid, which
> mm should the pasid be set? I've ever thought about passing &init_mm to
> iommu_sva_alloc_pasid(). But if you add "mm != current->mm", this seems
> not to work. Or do you prefer a separated interface for supervisor pasid
> allocation/free?

Without a mm_struct it is not SVA, so don't use SVA APIs for whatever
a 'supervisor pasid' is

Jason