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

From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Rajat Jain <rajatja@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Christoph Hellwig <hch@infradead.org>,
	David Woodhouse <dwmw2@infradead.org>,
	Lu Baolu <baolu.lu@linux.intel.com>,
	Joerg Roedel <joro@8bytes.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>,
	iommu@lists.linux-foundation.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-pci <linux-pci@vger.kernel.org>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	Raj Ashok <ashok.raj@intel.com>,
	"Krishnakumar,
	Lalithambika" <lalithambika.krishnakumar@intel.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	Prashant Malani <pmalani@google.com>,
	Benson Leung <bleung@google.com>, Todd Broch <tbroch@google.com>,
	Alex Levin <levinale@google.com>,
	Mattias Nissler <mnissler@google.com>,
	Rajat Jain <rajatxjain@gmail.com>,
	Bernie Keany <bernie.keany@intel.com>,
	Aaron Durbin <adurbin@google.com>,
	Diego Rivas <diegorivas@google.com>,
	Duncan Laurie <dlaurie@google.com>,
	Furquan Shaikh <furquan@google.com>,
	Jesse Barnes <jsbarnes@google.com>,
	Christian Kellner <christian@kellner.me>,
	Alex Williamson <alex.williamson@redhat.com>,
	"Oliver O'Halloran" <oohall@gmail.com>
Subject: Re: [PATCH 4/4] pci: export untrusted attribute in sysfs
Date: Thu, 18 Jun 2020 18:39:25 +0300	[thread overview]
Message-ID: <CAHp75Vf_gheXBZh-Mm7ME_eVWc5gPcwY98oCH1-QD920mK7gZw@mail.gmail.com> (raw)
In-Reply-To: <CACK8Z6F2Ssj=EqhR2DZ114ETgQ-3PhzVi2rm2xxenCNOVH=60g@mail.gmail.com>

On Thu, Jun 18, 2020 at 6:04 PM Rajat Jain <rajatja@google.com> wrote:
> On Thu, Jun 18, 2020 at 2:14 AM Andy Shevchenko
> <andy.shevchenko@gmail.com> wrote:

...

> To clarify, the attribute exposed by the firmware today is
> "ExternalFacingPort" and "external-facing" respectively:
>
> 617654aae50e ("PCI / ACPI: Identify untrusted PCI devices")
> 9cb30a71ac45d("PCI: OF: Support "external-facing" property")
>
> The kernel flag was named "untrusted" though, hence the assumption
> that "external=untrusted" is currently baked into the kernel today.
> IMHO, using "external" would fix that (The assumption can thus be
> contained in the IOMMU drivers) and at the same time allow more use of
> this attribute.

That discussion had been held, IIRC, during introduction of the
untrusted member in struct pci_dev...

> > > Trust is different, yes, don't get the two mixed up please.  That should
> > > be a different sysfs attribute for obvious reasons.
> >
> > Yes, as a bottom line that's what I meant as well.
>
> So what is the consensus here? I don't have a strong opinion - but it
> seemed to me Greg is saying "external" and Andy is saying "untrusted"?

...and a conclusion has been made as you may see. So, I would highly
recommend to speak to the author(s) of the patch that introduced /
adopted 'untrusted' member.

-- 
With Best Regards,
Andy Shevchenko