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

Toke Høiland-Jørgensen
2022-05-19T10:43:26Z

Benjamin Tissoires <benjamin.tissoires@redhat.com> writes:

> On Thu, May 19, 2022 at 10:39 AM Christoph Hellwig <hch@infradead.org> wrote:
>>
>> 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.
>
> Yes, quirks are a big motivation for this work. Right now half of the
> HID drivers are less than 100 lines of code, and are just trivial
> fixes (one byte in the report descriptor, one key mapping, etc...).
> Using eBPF for those would simplify the process from the user point of
> view: you drop a "firmware fix" as an eBPF program in your system and
> you can continue working on your existing kernel.

How do you envision those BPF programs living, and how would they be
distributed? (In-tree / out of tree?)

-Toke