From: Greg Kroah-Hartman <gregkh@linuxfoundation.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>,
Oliver O'Halloran <oohall@gmail.com>
Subject: Re: [PATCH 4/4] pci: export untrusted attribute in sysfs
Date: Thu, 18 Jun 2020 08:18:21 +0200 [thread overview]
Message-ID: <20200618061821.GB49383@kroah.com> (raw)
In-Reply-To: <CACK8Z6FecYkAYQh4sm4RbAQ1iwb9gexqgY9ExD9BH2p-5Usj=g@mail.gmail.com>
On Wed, Jun 17, 2020 at 12:53:03PM -0700, Rajat Jain wrote:
> Hi Greg, Christoph,
>
> On Wed, Jun 17, 2020 at 12:31 AM Christoph Hellwig <hch@infradead.org> wrote:
> >
> > 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.
>
> Sure. I can move the flag to the "struct device" (and likely call
> it "external" instead of "untrusted" so as to make it suitable for
> more use cases later). The buses can fill this up if they know which
> devices are external and which ones are not (otherwise it will be 0 by
> default). The PCI can fill this up like it does today, from platform
> info (ACPI / Device tree). Greg, how does this sound?
That's fine, convert USB over to use it at the same time if you get the
chance :)
thanks,
greg k-h
next prev parent reply other threads:[~2020-06-18 6:18 UTC|newest]
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
2020-06-17 19:53 ` Rajat Jain
2020-06-18 6:18 ` Greg Kroah-Hartman [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200618061821.GB49383@kroah.com \
--to=gregkh@linuxfoundation.org \
--cc=adurbin@google.com \
--cc=alex.williamson@redhat.com \
--cc=ashok.raj@intel.com \
--cc=baolu.lu@linux.intel.com \
--cc=bernie.keany@intel.com \
--cc=bhelgaas@google.com \
--cc=bleung@google.com \
--cc=christian@kellner.me \
--cc=diegorivas@google.com \
--cc=dlaurie@google.com \
--cc=dwmw2@infradead.org \
--cc=furquan@google.com \
--cc=hch@infradead.org \
--cc=iommu@lists.linux-foundation.org \
--cc=jean-philippe@linaro.org \
--cc=joro@8bytes.org \
--cc=jsbarnes@google.com \
--cc=lalithambika.krishnakumar@intel.com \
--cc=lenb@kernel.org \
--cc=levinale@google.com \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=mika.westerberg@linux.intel.com \
--cc=mnissler@google.com \
--cc=oohall@gmail.com \
--cc=pmalani@google.com \
--cc=rajatja@google.com \
--cc=rajatxjain@gmail.com \
--cc=rjw@rjwysocki.net \
--cc=tbroch@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).