Re: [PATCH v8 06/12] iommufd: Support pasid attach/replace

[Jason Gunthorpe <jgg@nvidia.com>]

On Thu, Feb 27, 2025 at 12:19:24PM +0800, Yi Liu wrote:
> However, the second one seems not trivial. iommu core stores domain/handle,
> while the iommufd needs hwpt to check if curr_hwpt is the same with new
> hwpt and the detach path needs hwpt as well.

Nicolin's series stores the hwpt in the domain:

struct iommu_domain {
        union { /* Pointer usable by owner of the domain */
                struct iommufd_hw_pagetable *iommufd_hwpt; /* iommufd */
        };

So it is possible

However, you should also to check that iommufd is the domain owner
which we don't have a thing for yet.

Maybe leave it like this for now and we can revisit the xarray when
more parts are done?

Jason