linux-kernel - RE: Plan for /dev/ioasid RFC v2

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Date:   Tue, 29 Jun 2021 00:28:29 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Alex Williamson <alex.williamson@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>
CC:     Joerg Roedel <joro@...tes.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        David Gibson <david@...son.dropbear.id.au>,
        "Jason Wang" <jasowang@...hat.com>,
        "parav@...lanox.com" <parav@...lanox.com>,
        "Enrico Weigelt, metux IT consult" <lkml@...ux.net>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Shenming Lu <lushenming@...wei.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>,
        Kirti Wankhede <kwankhede@...dia.com>,
        "Robin Murphy" <robin.murphy@....com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "David Woodhouse" <dwmw2@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>
Subject: RE: Plan for /dev/ioasid RFC v2

> From: Alex Williamson <alex.williamson@...hat.com>
> Sent: Tuesday, June 29, 2021 7:09 AM
> 
> > > Ideally vfio would also at least be able to register a type1 IOMMU
> > > backend through the existing uapi, backed by this iommu code, ie. we'd
> > > create a new "iommufd" (but without the user visible fd),
> >
> > It would be amazing to be able to achieve this, at least for me there
> > are too many details be able to tell what that would look like
> > exactly. I suggested once that putting the container ioctl interface
> > in the drivers/iommu code may allow for this without too much trouble..
> 
> If we can't achieve this, then type1 legacy code is going to need to
> live through an extended deprecation period.  I'm hoping that between
> type1 and a native interface we'll have two paths into iommufd to vet
> the design.  Thanks,
> 

I prefer to keeping type1 legacy code for some time. After the new
device-centric flow works, we can then study how to make type1
as a shim layer atop.

Thanks
Kevin