linux-kernel - Re: [PATCH v6 07/10] iommufd: Add a nested HW pagetable object

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Message-ID: <20231024171810.GO3952@nvidia.com>
Date:   Tue, 24 Oct 2023 14:18:10 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Yi Liu <yi.l.liu@...el.com>
Cc:     joro@...tes.org, alex.williamson@...hat.com, kevin.tian@...el.com,
        robin.murphy@....com, baolu.lu@...ux.intel.com, cohuck@...hat.com,
        eric.auger@...hat.com, nicolinc@...dia.com, kvm@...r.kernel.org,
        mjrosato@...ux.ibm.com, chao.p.peng@...ux.intel.com,
        yi.y.sun@...ux.intel.com, peterx@...hat.com, jasowang@...hat.com,
        shameerali.kolothum.thodi@...wei.com, lulu@...hat.com,
        suravee.suthikulpanit@....com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        zhenzhong.duan@...el.com, joao.m.martins@...cle.com
Subject: Re: [PATCH v6 07/10] iommufd: Add a nested HW pagetable object

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.

Jason