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

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Date:   Mon, 16 Oct 2023 08:54:07 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Yi Liu <yi.l.liu@...el.com>
Cc:     Nicolin Chen <nicolinc@...dia.com>, 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, 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 Mon, Oct 16, 2023 at 11:28:15AM +0800, Yi Liu wrote:
> On 2023/10/14 01:56, Nicolin Chen wrote:
> > On Fri, Oct 13, 2023 at 11:04:56AM -0300, Jason Gunthorpe wrote:
> > > 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..
> > 
> > I can add those "missing" data types, and then a driver will be
> > responsible for sanitizing the type along with the data_len.
> > 
> > I notice that the enum iommu_hwpt_data_type in the posted patch
> > is confined to the alloc_user uAPI. Perhaps we should share it
> > with invalidate too:
> 
> invalidation path does not need a type field today as the data
> type is vendor specific, vendor driver should know the data type
> when calls in.

I'm not keen on that, what if a driver needs another type in the
future?  You'd want to make the invalidation data format part of the
domain allocation?

Jason