linux-kernel - Re: [PATCH v3 15/16] iommu: introduce page response function

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Message-ID: <b0976bc9-68c8-f5c9-881b-5913a4ca1970@arm.com>
Date:   Fri, 8 Dec 2017 13:52:00 +0000
From:   Jean-Philippe Brucker <jean-philippe.brucker@....com>
To:     Alex Williamson <alex.williamson@...hat.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Lan Tianyu <tianyu.lan@...el.com>,
        Jean Delvare <khali@...ux-fr.org>,
        Will Deacon <Will.Deacon@....com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@...el.com>
Subject: Re: [PATCH v3 15/16] iommu: introduce page response function

On 07/12/17 21:51, Alex Williamson wrote:
>> Agree, IOMMU driver cannot enforce it. I think VFIO layer can make sure
>> page response come from the assigned device and its guest/container.
> 
> Can we enforce it via the IOMMU/VFIO interface?  If the response is for
> a struct device, and not an rid/did embedded in a structure, then vfio
> can pass it through w/o worrying about it, ie. response comes in via
> ioctl with association to vfio device fd -> struct vfio_device -> struct
> device, iommu driver fills in rid/did.  Thanks,

Yes that's probably the best way, reporting faults and receiving responses
on the device fd.

Thanks,
Jean