linux-kernel - Re: [PATCH v4 01/17] iommu: Add hwpt_type with user_data for domain_alloc

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Message-ID: <20231013140456.GR3952@nvidia.com>
Date:   Fri, 13 Oct 2023 11:04:56 -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 v4 01/17] iommu: Add hwpt_type with user_data for
 domain_alloc_user op

On Fri, Oct 13, 2023 at 12:33:13PM +0800, Yi Liu wrote:

> not really. Below the users of the struct iommu_user_data in my current
> iommufd_nesting branch. Only the domain_alloc_user op has type as there
> can be multiple vendor specific alloc data types. Basically, I'm ok to
> make the change you suggested, just not sure if it is good to add type
> as it is only needed by one path.

I don't think we should ever have an opaque data blob without a type
tag..

Jason