linux-kernel - RE: [RFC v2] /dev/iommu uAPI proposal

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Date:   Wed, 28 Jul 2021 04:05:56 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jean-Philippe Brucker <jean-philippe@...aro.org>
CC:     Jason Gunthorpe <jgg@...dia.com>,
        "Alex Williamson (alex.williamson@...hat.com)" 
        <alex.williamson@...hat.com>,
        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>,
        Joerg Roedel <joro@...tes.org>,
        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: [RFC v2] /dev/iommu uAPI proposal

> From: Jean-Philippe Brucker <jean-philippe@...aro.org>
> Sent: Monday, July 26, 2021 4:15 PM
> 
> Hi Kevin,
> 
> On Fri, Jul 09, 2021 at 07:48:44AM +0000, Tian, Kevin wrote:
> > /dev/iommu provides an unified interface for managing I/O page tables for
> > devices assigned to userspace. Device passthrough frameworks (VFIO,
> vDPA,
> > etc.) are expected to use this interface instead of creating their own logic to
> > isolate untrusted device DMAs initiated by userspace.
> >
> > This proposal describes the uAPI of /dev/iommu and also sample
> sequences
> > with VFIO as example in typical usages. The driver-facing kernel API
> provided
> > by the iommu layer is still TBD, which can be discussed after consensus is
> > made on this uAPI.
> 
> The document looks good to me, I don't have other concerns at the moment
> 

Thanks for your review.