Re: RFC: WMI Enhancements

From	Pali Rohár <pali.rohar@gmail.com>
Newsgroups	linux.kernel
Subject	Re: RFC: WMI Enhancements
Date	2017-04-19 19:00 +0200
Message-ID	<ty17s-5PA-25@gated-at.bofh.it> (permalink)
References	<tvzyF-2Mb-1@gated-at.bofh.it> <txSGS-FS-39@gated-at.bofh.it> <ty0O6-5Ir-19@gated-at.bofh.it>
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On Wednesday 19 April 2017 18:29:53 Mario.Limonciello@dell.com wrote:
> > As wrote above, I'm fine with explicit whitelist of WMI GUIDs which
> > will be exported to userspace after communication with vendor.
> 
> What about GUID's not yet used by kernel drivers?  Would those
> default to whitelist default to blacklist?  My preference would be
> to default to whitelist. This allows new GUID's to be added later
> without needing to modify kernel for something that kernel won't
> need to do anything immediately.

I understood it as there would be explicit whitelist in kernel and new 
GUIDs would be needed to add into whitelist, even those which do not 
have kernel wmi driver.

Exporting all GUIDs (to userspace) which are not bind to kernel driver 
has one big problem. If kernel introduce new wmi driver for such GUID 
then it block userspace to access it or at least would need to provide 
audit filter and something would be probably filtered. It means that 
some userspace applications which would use that GUIDs stops working 
after upgrading to new kernel. And we can be in situation where *user* 
need to decide: either use 3rd party userspace application from vendor 
which provide some special settings for your laptop, or use kernel 
module which provides standard rfkill/led/input class driver.

-- 
Pali Rohár
pali.rohar@gmail.com

Thread

RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-13 01:10 +0200
  Re: RFC: WMI Enhancements Pali Rohár <pali.rohar@gmail.com> - 2017-04-13 09:40 +0200
    Re: RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-13 19:00 +0200
      RE: RFC: WMI Enhancements <Mario.Limonciello@dell.com> - 2017-04-13 22:40 +0200
        Re: RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-14 02:00 +0200
          RE: RFC: WMI Enhancements <Mario.Limonciello@dell.com> - 2017-04-14 19:50 +0200
            Re: RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-14 20:30 +0200
              RE: RFC: WMI Enhancements <Mario.Limonciello@dell.com> - 2017-04-14 21:10 +0200
  Re: RFC: WMI Enhancements Michał Kępień <kernel@kempniu.pl> - 2017-04-13 09:40 +0200
    RE: RFC: WMI Enhancements <Mario.Limonciello@dell.com> - 2017-04-13 15:50 +0200
      Re: RFC: WMI Enhancements Pali Rohár <pali.rohar@gmail.com> - 2017-04-13 16:00 +0200
        Re: RFC: WMI Enhancements Andy Lutomirski <luto@kernel.org> - 2017-04-13 17:40 +0200
          RE: RFC: WMI Enhancements <Mario.Limonciello@dell.com> - 2017-04-13 18:00 +0200
            Re: RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-13 18:10 +0200
        RE: RFC: WMI Enhancements <Mario.Limonciello@dell.com> - 2017-04-13 17:50 +0200
          Re: RFC: WMI Enhancements Andy Shevchenko <andriy.shevchenko@linux.intel.com> - 2017-04-18 12:00 +0200
            RE: RFC: WMI Enhancements <Mario.Limonciello@dell.com> - 2017-04-18 16:10 +0200
    Re: RFC: WMI Enhancements Andy Lutomirski <luto@kernel.org> - 2017-04-13 17:40 +0200
      Re: RFC: WMI Enhancements Andy Lutomirski <luto@kernel.org> - 2017-04-13 17:50 +0200
        Re: RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-13 18:20 +0200
      Re: RFC: WMI Enhancements Pali Rohár <pali.rohar@gmail.com> - 2017-04-13 17:50 +0200
      Re: RFC: WMI Enhancements Andy Lutomirski <luto@kernel.org> - 2017-04-13 18:00 +0200
        RE: RFC: WMI Enhancements <Mario.Limonciello@dell.com> - 2017-04-13 19:00 +0200
          Re: RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-13 19:10 +0200
            Re: RFC: WMI Enhancements Andy Lutomirski <luto@kernel.org> - 2017-04-13 19:50 +0200
              RE: RFC: WMI Enhancements <Mario.Limonciello@dell.com> - 2017-04-13 20:00 +0200
            RE: RFC: WMI Enhancements <Mario.Limonciello@dell.com> - 2017-04-13 19:50 +0200
              Re: RFC: WMI Enhancements Pali Rohár <pali.rohar@gmail.com> - 2017-04-18 10:00 +0200
                Re: RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-18 19:00 +0200
                Re: RFC: WMI Enhancements Pali Rohár <pali.rohar@gmail.com> - 2017-04-18 21:30 +0200
      RE: RFC: WMI Enhancements <Mario.Limonciello@dell.com> - 2017-04-13 18:00 +0200
        Re: RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-13 19:10 +0200
          Re: RFC: WMI Enhancements Andy Lutomirski <luto@kernel.org> - 2017-04-13 19:40 +0200
            RE: RFC: WMI Enhancements <Mario.Limonciello@dell.com> - 2017-04-13 19:50 +0200
      Re: RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-13 18:10 +0200
  Re: RFC: WMI Enhancements "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-04-15 01:00 +0200
    Re: RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-15 01:10 +0200
      Re: RFC: WMI Enhancements Andy Lutomirski <luto@amacapital.net> - 2017-04-18 00:10 +0200
        Re: RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-18 01:20 +0200
          Re: RFC: WMI Enhancements "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-04-18 15:20 +0200
            Re: RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-18 18:40 +0200
              Re: RFC: WMI Enhancements Pali Rohár <pali.rohar@gmail.com> - 2017-04-18 21:30 +0200
                Re: RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-19 00:50 +0200
                Re: RFC: WMI Enhancements Pali Rohár <pali.rohar@gmail.com> - 2017-04-19 10:00 +0200
                RE: RFC: WMI Enhancements <Mario.Limonciello@dell.com> - 2017-04-19 18:40 +0200
                Re: RFC: WMI Enhancements Pali Rohár <pali.rohar@gmail.com> - 2017-04-19 19:00 +0200
                RE: RFC: WMI Enhancements <Mario.Limonciello@dell.com> - 2017-04-19 19:30 +0200
                Re: RFC: WMI Enhancements Pali Rohár <pali.rohar@gmail.com> - 2017-04-20 15:20 +0200
                Re: RFC: WMI Enhancements Darren Hart <dvhart@infradead.org> - 2017-04-20 22:50 +0200
                Re: RFC: WMI Enhancements Christoph Hellwig <hch@infradead.org> - 2017-04-20 16:20 +0200
              Re: RFC: WMI Enhancements "Rafael J. Wysocki" <rafael@kernel.org> - 2017-04-18 23:20 +0200

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