Re: [PATCH 2/6] thunderbolt: Add support for PCIe tunneling disabled (SL5)

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On Tue, Jan 26, 2021 at 6:26 PM Mika Westerberg
<mika.westerberg@xxxxxxxxxxxxxxx> wrote:
>
> On Tue, Jan 26, 2021 at 06:18:47PM +0200, Yehezkel Bernat wrote:
> > On Tue, Jan 26, 2021 at 5:57 PM Mika Westerberg
> > <mika.westerberg@xxxxxxxxxxxxxxx> wrote:
> > >
> > > Recent Intel Thunderbolt firmware connection manager has support for
> > > another security level, SL5, that disables PCIe tunneling. This option
> > > can be turned on from the BIOS.
> > >
> > > When this is set the driver exposes a new security level "nopcie" to the
> > > userspace and hides the authorized attribute under connected devices.
> > >
> > > While there we also hide it when "dponly" security level is enabled
> > > since it is not really usable in that case anyway.
> > >
> > > Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> > > ---
> >
> > Looks good to me, I'm just not sure I understand how this is different from
> > dponly mode. Is this just because it comes from the new _OSC?
>
> The firmware connection manager reports this new security level instead
> of dponly so we reflect that to the userspace, and while at it take
> advantage of the nopcie when USB4 _OSC disables PCIe tunneling so they
> both look the same from userspace perspective.

Makes sense. Thanks for the clarification!




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