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Date:   Tue, 24 Oct 2023 10:28:45 -0700
From:   Nicolin Chen <nicolinc@nvidia.com>
To:     Jason Gunthorpe <jgg@nvidia.com>
CC:     Yi Liu <yi.l.liu@intel.com>, <joro@8bytes.org>,
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Subject: Re: [PATCH v6 07/10] iommufd: Add a nested HW pagetable object
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On Tue, Oct 24, 2023 at 02:18:10PM -0300, Jason Gunthorpe wrote:
> On Tue, Oct 24, 2023 at 08:06:06AM -0700, Yi Liu wrote:
> > @@ -195,6 +279,10 @@ int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd)
> >  	if (pt_obj->type == IOMMUFD_OBJ_IOAS) {
> >  		struct iommufd_hwpt_paging *hwpt_paging;
> >  
> > +		if (cmd->data_type != IOMMU_HWPT_DATA_NONE) {
> > +			rc = -EINVAL;
> > +			goto out_put_pt;
> > +		}
> >  		ioas = container_of(pt_obj, struct iommufd_ioas, obj);
> >  		mutex_lock(&ioas->mutex);
> >  		hwpt_paging = iommufd_hwpt_paging_alloc(ucmd->ictx, ioas, idev,
> 
> ?? What is this?
> 
> Ah something went wrong earlier in "iommu: Pass in parent domain with
> user_data to domain_alloc_user op"
> 
> Once we added the user_data we should flow it through to the op
> always.

Hmm, iommufd_hwpt_paging_alloc doesn't take (or need) user_data,
but we could pass in a dummy one if that looks better?

Thanks
Nicolin