Re: [PATCH v10 12/18] iommufd: Enforce PASID-compatible domain for RID

[Jason Gunthorpe <jgg@nvidia.com>]

On Thu, Mar 20, 2025 at 06:47:38AM -0700, Yi Liu wrote:
> Per the definition of IOMMU_HWPT_ALLOC_PASID, iommufd needs to enforce
> the RID to use PASID-compatible domain if PASID has been attached, and
> vice versa. The PASID path has already enforced it. This adds the
> enforcement in the RID path.
> 
> This enforcement requires a lock across the RID and PASID attach path,
> the idev->igroup->lock is used as both the RID and the PASID path holds
> it.
> 
> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
> ---
> v9 -> v10: split the hwpt->pasid_compat check to a separate if in the
>            else statement.
> ---
>  drivers/iommu/iommufd/device.c | 26 ++++++++++++++++++++++----
>  1 file changed, 22 insertions(+), 4 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Jason