linux-kernel - Re: [RFC] /dev/ioasid uAPI proposal

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Date:   Wed, 2 Jun 2021 14:24:24 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        David Woodhouse <dwmw2@...radead.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Alex Williamson (alex.williamson@...hat.com)" 
        <alex.williamson@...hat.com>, Jason Wang <jasowang@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>, "Wu, Hao" <hao.wu@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [RFC] /dev/ioasid uAPI proposal

On Wed, Jun 02, 2021 at 10:56:48AM +0200, Enrico Weigelt, metux IT consult wrote:

> If I understand this correctly, /dev/ioasid is a kind of "common supplier"
> to other APIs / devices. Why can't the fd be acquired by the
> consumer APIs (eg. kvm, vfio, etc) ?

/dev/ioasid would be similar to /dev/vfio, and everything already
deals with exposing /dev/vfio and /dev/vfio/N together

I don't see it as a problem, just more work.

Having FDs spawn other FDs is pretty ugly, it defeats the "everything
is a file" model of UNIX.

Jason