linux-kernel - Re: [PATCH 4/4] pci: export untrusted attribute in sysfs

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Date:   Thu, 18 Jun 2020 16:56:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Rajat Jain <rajatja@...gle.com>,
        Christoph Hellwig <hch@...radead.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, iommu@...ts.linux-foundation.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Raj Ashok <ashok.raj@...el.com>,
        "Krishnakumar, Lalithambika" <lalithambika.krishnakumar@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Prashant Malani <pmalani@...gle.com>,
        Benson Leung <bleung@...gle.com>,
        Todd Broch <tbroch@...gle.com>,
        Alex Levin <levinale@...gle.com>,
        Mattias Nissler <mnissler@...gle.com>,
        Rajat Jain <rajatxjain@...il.com>,
        Bernie Keany <bernie.keany@...el.com>,
        Aaron Durbin <adurbin@...gle.com>,
        Diego Rivas <diegorivas@...gle.com>,
        Duncan Laurie <dlaurie@...gle.com>,
        Furquan Shaikh <furquan@...gle.com>,
        Jesse Barnes <jsbarnes@...gle.com>,
        Christian Kellner <christian@...lner.me>,
        Alex Williamson <alex.williamson@...hat.com>,
        Oliver O'Halloran <oohall@...il.com>
Subject: Re: [PATCH 4/4] pci: export untrusted attribute in sysfs

On Thu, Jun 18, 2020 at 12:14:41PM +0300, Andy Shevchenko wrote:
> On Thu, Jun 18, 2020 at 11:36 AM Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> > On Thu, Jun 18, 2020 at 11:12:56AM +0300, Andy Shevchenko wrote:
> > > On Wed, Jun 17, 2020 at 10:56 PM Rajat Jain <rajatja@...gle.com> wrote:
> > > > On Wed, Jun 17, 2020 at 12:31 AM Christoph Hellwig <hch@...radead.org> wrote:
> > >
> > > ...
> > >
> > > > (and likely call it "external" instead of "untrusted".
> > >
> > > Which is not okay. 'External' to what? 'untrusted' has been carefully
> > > chosen by the meaning of it.
> > > What external does mean for M.2. WWAN card in my laptop? It's in ACPI
> > > tables, but I can replace it.
> >
> > Then your ACPI tables should show this, there is an attribute for it,
> > right?
> 
> There is a _PLD() method, but it's for the USB devices (or optional
> for others, I don't remember by heart). So, most of the ACPI tables,
> alas, don't show this.

There is something like this for PCI as well, otherwise they wouldn't be
getting this info from "the ether" :)

thanks,

greg k-h