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

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Message-ID: <20210804140447.GH1721383@nvidia.com>
Date:   Wed, 4 Aug 2021 11:04:47 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     David Gibson <david@...son.dropbear.id.au>,
        "Alex Williamson (alex.williamson@...hat.com)" 
        <alex.williamson@...hat.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        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

On Mon, Aug 02, 2021 at 02:49:44AM +0000, Tian, Kevin wrote:

> Can you elaborate? IMO the user only cares about the label (device cookie 
> plus optional vPASID) which is generated by itself when doing the attaching
> call, and expects this virtual label being used in various spots (invalidation,
> page fault, etc.). How the system labels the traffic (the physical RID or RID+
> PASID) should be completely invisible to userspace.

I don't think that is true if the vIOMMU driver is also emulating
PASID. Presumably the same is true for other PASID-like schemes.

Jason