linux-kernel - Re: [PATCH v4 00/17] Add VFIO mediated device support and DEV-MSI support for the idxd driver

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Message-ID: <20201102185130.GB3600342@nvidia.com>
Date:   Mon, 2 Nov 2020 14:51:30 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Dan Williams <dan.j.williams@...el.com>
CC:     Dave Jiang <dave.jiang@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vinod Koul <vkoul@...nel.org>,
        "Dey, Megha" <megha.dey@...el.com>, <maz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Jacob jun Pan" <jacob.jun.pan@...el.com>,
        Yi L Liu <yi.l.liu@...el.com>, Baolu Lu <baolu.lu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Sanjay K Kumar <sanjay.k.kumar@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>, Jing Lin <jing.lin@...el.com>,
        <kwankhede@...dia.com>, <eric.auger@...hat.com>,
        "Parav Pandit" <parav@...lanox.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>, <netanelg@...lanox.com>,
        <shahafs@...lanox.com>, <yan.y.zhao@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Samuel Ortiz" <samuel.ortiz@...el.com>,
        Mona Hossain <mona.hossain@...el.com>,
        Megha Dey <megha.dey@...ux.intel.com>,
        <dmaengine@...r.kernel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
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Subject: Re: [PATCH v4 00/17] Add VFIO mediated device support and DEV-MSI
 support for the idxd driver

On Mon, Nov 02, 2020 at 10:38:28AM -0800, Dan Williams wrote:

> > I think you will be the first to use the namespace stuff for this, it
> > seems like a good idea and others should probably do so as well.
> 
> I was thinking either EXPORT_SYMBOL_NS, or auxiliary bus, because you
> should be able to export an ops structure with all the necessary
> callbacks. 

'or'? 

Auxiliary bus should not be used with huge arrays of function
pointers... The module providing the device should export a normal
linkable function interface. Putting that in a namespace makes a lot
of sense.

Jason