linux-kernel - Re: [PATCH bpf-next v5 00/17] Introduce eBPF support for HID devices

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Date:   Thu, 19 May 2022 01:38:58 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Jiri Kosina <jikos@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Shuah Khan <shuah@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        Joe Stringer <joe@...ium.io>, Jonathan Corbet <corbet@....net>,
        Tero Kristo <tero.kristo@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH bpf-next v5 00/17] Introduce eBPF support for HID devices

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.