linux-kernel - RE: [PATCH v3 15/15] vfio: Add struct device to vfio

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Date:   Tue, 20 Sep 2022 22:55:40 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Alex Williamson <alex.williamson@...hat.com>
CC:     Zhenyu Wang <zhenyuw@...ux.intel.com>,
        "Wang, Zhi A" <zhi.a.wang@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        "Joonas Lahtinen" <joonas.lahtinen@...ux.intel.com>,
        "Vivi, Rodrigo" <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Eric Farman <farman@...ux.ibm.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Vineeth Vijayan <vneethv@...ux.ibm.com>,
        "Peter Oberparleiter" <oberpar@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
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        Harald Freudenberger <freude@...ux.ibm.com>,
        Diana Craciun <diana.craciun@....nxp.com>,
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        Longfang Liu <liulongfang@...wei.com>,
        "Shameer Kolothum" <shameerali.kolothum.thodi@...wei.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Yishai Hadas <yishaih@...dia.com>,
        Eric Auger <eric.auger@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        "Leon Romanovsky" <leon@...nel.org>,
        Abhishek Sahu <abhsahu@...dia.com>,
        "Christoph Hellwig" <hch@...radead.org>,
        "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
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        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Liu, Yi L" <yi.l.liu@...el.com>
Subject: RE: [PATCH v3 15/15] vfio: Add struct device to vfio_device

> From: Alex Williamson <alex.williamson@...hat.com>
> Sent: Wednesday, September 21, 2022 4:27 AM
> 
> On Fri,  9 Sep 2022 18:22:47 +0800
> Kevin Tian <kevin.tian@...el.com> wrote:
> 
> > From: Yi Liu <yi.l.liu@...el.com>
> >
> > and replace kref. With it a 'vfio-dev/vfioX' node is created under the
> > sysfs path of the parent, indicating the device is bound to a vfio
> > driver, e.g.:
> >
> > /sys/devices/pci0000\:6f/0000\:6f\:01.0/vfio-dev/vfio0
> >
> > It is also a preparatory step toward adding cdev for supporting future
> > device-oriented uAPI.
> >
> > Add Documentation/ABI/testing/sysfs-devices-vfio-dev.
> >
> > Also take this chance to rename chardev 'vfio' to 'vfio-group' in
> > /proc/devices.
> 
> What's the risk/reward here, is this just more aesthetically pleasing
> symmetry vs 'vfio-dev'?  The char major number to name association in
> /proc/devices seems pretty obscure, but what due diligence have we done
> to make sure this doesn't break anyone?  Thanks,
> 

I'm not sure whether the content of /proc/devices is considered as ABI.

@Jason?

But to be safe I can remove this change in next version. If it's the right
thing to do such change after discussion then it can be done in a separate
patch after.