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Date:   Thu, 19 May 2022 01:38:58 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Greg KH <gregkh@linuxfoundation.org>
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Subject: Re: [PATCH bpf-next v5 00/17] Introduce eBPF support for HID devices
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On Thu, May 19, 2022 at 10:20:35AM +0200, Greg KH wrote:
> > are written using a hip new VM?
> 
> Ugh, don't mention UDI, that's a bad flashback...

But that is very much what we are doing here.

> I thought the goal here was to move a lot of the quirk handling and
> "fixup the broken HID decriptors in this device" out of kernel .c code
> and into BPF code instead, which this patchset would allow.
> 
> So that would just be exception handling.  I don't think you can write a
> real HID driver here at all, but I could be wrong as I have not read the
> new patchset (older versions of this series could not do that.)

And that "exception handling" is most of the driver.