Re: [PATCH v3 15/15] vfio: Add struct device to vfio_device

[Alex Williamson]

On Fri,  9 Sep 2022 18:22:47 +0800
Kevin Tian <kevin.tian@xxxxxxxxx> wrote:

> From: Yi Liu <yi.l.liu@xxxxxxxxx>
> 
> 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,

Alex