linux-kernel - Re: [PATCH v6 01/11] iommu: Add dma ownership management interfaces

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Message-ID: <20220223180244.GA390403@nvidia.com>
Date:   Wed, 23 Feb 2022 14:02:44 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>, rafael@...nel.org,
        Diana Craciun <diana.craciun@....nxp.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Stuart Yoder <stuyoder@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Li Yang <leoyang.li@....com>,
        Dmitry Osipenko <digetx@...il.com>,
        iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 01/11] iommu: Add dma ownership management interfaces

On Wed, Feb 23, 2022 at 06:00:06PM +0000, Robin Murphy wrote:

> ...and equivalently just set owner_cnt directly to 0 here. I don't see a
> realistic use-case for any driver to claim the same group more than once,
> and allowing it in the API just feels like opening up various potential
> corners for things to get out of sync.

I am Ok if we toss it out to get this merged, as there is no in-kernel
user right now.

Something will have to come back for iommufd, but we can look at what
is best suited then.

Thanks,
Jason