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From: Christoph Hellwig <hch@infradead.org>
To: Rajat Jain <rajatja@google.com>
Cc: 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>,
	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>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Oliver O'Halloran <oohall@gmail.com>
Subject: Re: [PATCH 4/4] pci: export untrusted attribute in sysfs
Date: Wed, 17 Jun 2020 00:31:00 -0700
Message-ID: <20200617073100.GA14424@infradead.org> (raw)
In-Reply-To: <CACK8Z6ELaM8KxbwPor=BUquWN7pALQmmHu5geSOc71P3KoJ1QA@mail.gmail.com>

On Tue, Jun 16, 2020 at 12:27:35PM -0700, Rajat Jain wrote:
> Need clarification. The flag "untrusted" is currently a part of
> pci_dev struct, and is populated within the PCI subsystem.

Yes, and that is the problem.

> 
> 1) Is your suggestion to move this flag as well as the attribute to
> device core (in "struct device")? This would allow other buses to
> populate/use this flag if they want. By default it'll be set to 0 for
> all devices (PCI subsystem will populate it based on platform info,
> like it does today).
> 
> OR
> 
> 2) Are you suggesting to keep the "untrusted" flag within PCI, but
> attach the sysfs attribute to the base device? (&pci_dev->dev)?

(1).  As for IOMMUs and userspace policy it really should not matter
what bus a device is on if it is external and not trustworthy.

  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-16  1:17 [PATCH 1/4] pci: Keep the ACS capability offset in device Rajat Jain
2020-06-16  1:17 ` [PATCH 2/4] pci: set "untrusted" flag for truly external devices only Rajat Jain
2020-06-16  9:07   ` Mika Westerberg
2020-06-16  1:17 ` [PATCH 3/4] pci: acs: Enable PCI_ACS_TB for untrusted/external-facing devices Rajat Jain
2020-06-19 16:10   ` Raj, Ashok
2020-06-22 23:01     ` Rajat Jain
2020-06-16  1:17 ` [PATCH 4/4] pci: export untrusted attribute in sysfs Rajat Jain
2020-06-16  5:57   ` Greg Kroah-Hartman
2020-06-16  7:32   ` Christoph Hellwig
2020-06-16 19:27     ` Rajat Jain
2020-06-17  7:31       ` Christoph Hellwig [this message]
2020-06-17 19:53         ` Rajat Jain
2020-06-18  6:18           ` Greg Kroah-Hartman
2020-06-18  8:12           ` Andy Shevchenko
2020-06-18  8:36             ` Greg Kroah-Hartman
2020-06-18  9:14               ` Andy Shevchenko
2020-06-18 14:56                 ` Greg Kroah-Hartman
2020-06-18 15:03                 ` Rajat Jain
2020-06-18 15:39                   ` Andy Shevchenko
2020-06-18 16:02                   ` Greg Kroah-Hartman
2020-06-18 16:23                     ` Raj, Ashok
2020-06-18 17:23                       ` Rajat Jain
2020-06-18 18:46                         ` Greg Kroah-Hartman
2020-06-18 23:58   ` Rajat Jain

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