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

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Date:   Tue, 8 Jun 2021 12:43:38 +0200
From:   "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To:     Jason Gunthorpe <jgg@...dia.com>
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 04.06.21 14:30, Jason Gunthorpe wrote:

Hi,

> Containers already needed to do this today. Container orchestration is
> hard.

Yes, but I hate to see even more work upcoming here.

> Yes, /dev/ioasid shouldn't do anything unless you have a device to
> connect it with. In this way it is probably safe to stuff it into
> every container.

Okay, if we can guarantee that, I'm completely fine.

>>> Having FDs spawn other FDs is pretty ugly, it defeats the "everything
>>> is a file" model of UNIX.
>>
>> Unfortunately, this is already defeated in many other places :(
>> (I'd even claim that ioctls already break it :p)
> 
> I think you are reaching a bit :)
> 
>> It seems your approach also breaks this, since we now need to open two
>> files in order to talk to one device.
> 
> It is two devices, thus two files.

Two separate real (hardware) devices or just two logical device nodes ?


--mtx

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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@...ux.net -- +49-151-27565287