Re: [PATCH v4 03/12] iommu: Add new flag to explictly request PASID capable domain

[Baolu Lu <baolu.lu@linux.intel.com>]

On 2024/10/23 18:41, Vasant Hegde wrote:
> From: Jason Gunthorpe<jgg@ziepe.ca>
> 
> Introduce new flag (IOMMU_HWPT_ALLOC_PASID) to domain_alloc_users() ops.
> If IOMMU supports PASID it will allocate domain. Otherwise return error.
> In error path check for -EOPNOTSUPP and try to allocate non-PASID
> domain so that DMA-API mode work fine for drivers which does not support
> PASID as well.
> 
> Also modify __iommu_group_alloc_default_domain() to call
> iommu_paging_domain_alloc_flags() with appropriate flag when allocating
> paging domain.
> 
> Signed-off-by: Jason Gunthorpe<jgg@ziepe.ca>
> Co-developed-by: Vasant Hegde<vasant.hegde@amd.com>
> Signed-off-by: Vasant Hegde<vasant.hegde@amd.com>
> ---
>   drivers/iommu/iommu.c        | 56 +++++++++++++++++++++++++++++-------
>   include/uapi/linux/iommufd.h |  8 ++++++
>   2 files changed, 53 insertions(+), 11 deletions(-)

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>

Thanks,
baolu