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Re: WMI and Kernel:User interface

From Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Newsgroups linux.kernel
Subject Re: WMI and Kernel:User interface
Date 2017-06-13 18:10 +0200
Message-ID <tRWye-1GR-11@gated-at.bofh.it> (permalink)
References (3 earlier) <tRFQK-83F-29@gated-at.bofh.it> <tRIOC-1q5-1@gated-at.bofh.it> <tRO7D-4US-11@gated-at.bofh.it> <tRSNX-7O4-1@gated-at.bofh.it> <tRWeR-1ld-19@gated-at.bofh.it>
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On Tue, Jun 13, 2017 at 08:44:19AM -0700, Darren Hart wrote:
> > In some cases filter function can be simple in some cases hard. I can
> > image that usage of while listing, plus in some cases also filtering
> > (when it would be relatively easy to implement).
> 
> See my response to Christoph - to address the concern of breaking userspace
> later, if we consider this a proxy instead of a filter, we can make it
> transparent to userspace and maintain kernel driver state. The driver can
> register a wmi_method_proxy callback which can choose to proxy the method call
> or not. If it does, it can update it's own state and perform the requested
> action through it's own infrastructure, populate the out buffer and send it back
> up to userspace. I would hope to see as few of these as possible, but they would
> allow for protecting the kernel drivers while still enabling userspace usage of
> WMI.

Ok, I think we need to see some real code here to get any further with
this.  There's a reason we don't do big design discussions without
patches, as that usually answers all of the questions involved.

Please, let's see some code before anything else.

thanks,

greg k-h

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Thread

Re: WMI and Kernel:User interface Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-09 08:50 +0200
  Re: WMI and Kernel:User interface Darren Hart <dvhart@infradead.org> - 2017-06-10 02:50 +0200
    Re: WMI and Kernel:User interface Pali Rohár <pali.rohar@gmail.com> - 2017-06-10 12:40 +0200
      Re: WMI and Kernel:User interface Darren Hart <dvhart@infradead.org> - 2017-06-12 19:10 +0200
        Re: WMI and Kernel:User interface Pali Rohár <pali.rohar@gmail.com> - 2017-06-13 00:20 +0200
          Re: WMI and Kernel:User interface Darren Hart <dvhart@infradead.org> - 2017-06-13 03:30 +0200
            Re: WMI and Kernel:User interface Christoph Hellwig <hch@infradead.org> - 2017-06-13 09:10 +0200
              Re: WMI and Kernel:User interface Pali Rohár <pali.rohar@gmail.com> - 2017-06-13 14:10 +0200
                Re: WMI and Kernel:User interface Darren Hart <dvhart@infradead.org> - 2017-06-13 17:50 +0200
                Re: WMI and Kernel:User interface Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-13 18:10 +0200
                Re: WMI and Kernel:User interface Darren Hart <dvhart@infradead.org> - 2017-06-13 18:30 +0200
              Re: WMI and Kernel:User interface Darren Hart <dvhart@infradead.org> - 2017-06-13 17:40 +0200
                Re: WMI and Kernel:User interface Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-13 18:00 +0200
                Re: WMI and Kernel:User interface Andy Lutomirski <luto@kernel.org> - 2017-06-13 18:00 +0200
                RE: WMI and Kernel:User interface <Mario.Limonciello@dell.com> - 2017-06-13 18:20 +0200
                Re: WMI and Kernel:User interface Greg KH <gregkh@linuxfoundation.org> - 2017-06-13 19:00 +0200
                Re: WMI and Kernel:User interface Pali Rohár <pali.rohar@gmail.com> - 2017-06-13 19:50 +0200
                Re: WMI and Kernel:User interface Darren Hart <dvhart@infradead.org> - 2017-06-13 18:50 +0200
                Re: WMI and Kernel:User interface Darren Hart <dvhart@infradead.org> - 2017-06-13 18:30 +0200
                Re: WMI and Kernel:User interface Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-13 19:00 +0200
                Re: WMI and Kernel:User interface Darren Hart <dvhart@infradead.org> - 2017-06-13 19:10 +0200
                Re: WMI and Kernel:User interface Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-14 06:40 +0200
                Re: WMI and Kernel:User interface Pali Rohár <pali.rohar@gmail.com> - 2017-06-13 19:20 +0200
                Re: WMI and Kernel:User interface Darren Hart <dvhart@infradead.org> - 2017-06-13 19:50 +0200
                Re: WMI and Kernel:User interface Darren Hart <dvhart@infradead.org> - 2017-06-13 20:10 +0200
                Re: WMI and Kernel:User interface Pali Rohár <pali.rohar@gmail.com> - 2017-06-13 20:10 +0200
                Re: WMI and Kernel:User interface Bernd Petrovitsch <bernd@petrovitsch.priv.at> - 2017-06-14 02:30 +0200
            Re: WMI and Kernel:User interface Pali Rohár <pali.rohar@gmail.com> - 2017-06-13 15:00 +0200
              Re: WMI and Kernel:User interface Darren Hart <dvhart@infradead.org> - 2017-06-13 18:10 +0200

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