From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rajat Jain <rajatja@google.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Bjorn Helgaas <helgaas@kernel.org>, Len Brown <lenb@kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
Linux PCI <linux-pci@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Rajat Jain <rajatxjain@gmail.com>,
Dmitry Torokhov <dtor@google.com>,
Jesse Barnes <jsbarnes@google.com>,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
Pavel Machek <pavel@denx.de>,
Oliver O'Halloran <oohall@gmail.com>,
Joerg Roedel <joro@8bytes.org>
Subject: Re: [PATCH] PCI: ACPI: Allow internal devices to be marked as untrusted
Date: Mon, 31 Jan 2022 08:41:36 +0200 [thread overview]
Message-ID: <YfeEoF35RPDVMdzD@lahna> (raw)
In-Reply-To: <CAJZ5v0iuM_qjhPxvhzgvtKM-4pBB2skf9G=R=Qo6NzKnZ2LN=w@mail.gmail.com>
Hi,
On Sun, Jan 30, 2022 at 03:30:39PM +0100, Rafael J. Wysocki wrote:
> > I'm open to doing so if the others also feel the same way. IMHO
> > though, the semantics of ACPI "DmaProperty" differ from the semantics
> > of the property I'm proposing here.
> >
> > The current (documented) semantics (of "DmaProperty"): *This device
> > (root port) is trusted*, but any devices downstream are not to be
> > trusted.
> >
> > What I need and am proposing (new "UntrustedDevice"): *This device as
> > well as any downstream devices* are untrusted.
> >
> > Note that there may be firmware implementing "DmaProperty" already out
> > there (for windows), and if we decide to use it for my purposes, then
> > there shall be a discrepancy in how Linux uses that property vs
> > Windows. Is that acceptable?
>
> It may be confusing, so I'd rather not do that.
>
> The platform firmware will use it with the Windows use case in mind
> and if it has side effects in Linux, problems are likely to appear in
> the field.
>
> So the question is rather not about it being acceptable, but about
> whether or not this is generally going to work.
I was kind of implying that we could perhaps contact Microsoft and ask
them if the wording could be changed to cover all the devices, not just
PCIe root ports. I think this is something they will also need for
things like internal WI-FI controllers.
If that's not possible then no objections adding "UntrustedDevice". We
just need to deal with the "DmaProperty" anyway and both end up setting
pdev->untrusted in the similar manner.
next prev parent reply other threads:[~2022-01-31 6:42 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-20 0:04 [PATCH] PCI: ACPI: Allow internal devices to be marked as untrusted Rajat Jain
2022-01-20 2:25 ` Dmitry Torokhov
2022-01-20 15:08 ` Rajat Jain
2022-01-27 23:02 ` Rajat Jain
2022-01-21 21:41 ` Bjorn Helgaas
2022-01-22 14:46 ` Greg Kroah-Hartman
2022-01-24 6:27 ` Mika Westerberg
2022-01-25 10:58 ` Mika Westerberg
2022-01-25 11:15 ` Greg Kroah-Hartman
2022-01-25 12:55 ` Mika Westerberg
2022-01-25 14:45 ` Rafael J. Wysocki
2022-01-27 22:26 ` Rajat Jain
2022-01-28 7:48 ` Mika Westerberg
2022-01-28 21:34 ` Rajat Jain
2022-01-30 14:30 ` Rafael J. Wysocki
2022-01-31 6:41 ` Mika Westerberg [this message]
2022-01-31 19:57 ` Rajat Jain
2022-02-02 2:05 ` Rajat Jain
2022-01-28 9:55 ` Jean-Philippe Brucker
2022-01-25 14:40 ` Rafael J. Wysocki
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=YfeEoF35RPDVMdzD@lahna \
--to=mika.westerberg@linux.intel.com \
--cc=bhelgaas@google.com \
--cc=dtor@google.com \
--cc=gregkh@linuxfoundation.org \
--cc=helgaas@kernel.org \
--cc=jean-philippe@linaro.org \
--cc=joro@8bytes.org \
--cc=jsbarnes@google.com \
--cc=lenb@kernel.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=oohall@gmail.com \
--cc=pavel@denx.de \
--cc=rafael@kernel.org \
--cc=rajatja@google.com \
--cc=rajatxjain@gmail.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).