From: Andi Kleen <ak@linux.intel.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Michael S. Tsirkin" <mst@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>,
Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com>,
Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
"Rafael J . Wysocki" <rafael@kernel.org>,
Michael Jamet <michael.jamet@intel.com>,
linux-pci@vger.kernel.org, x86@kernel.org,
virtualization@lists.linux-foundation.org,
Yehezkel Bernat <YehezkelShB@gmail.com>,
linux-kernel@vger.kernel.org,
Andreas Noever <andreas.noever@gmail.com>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Bjorn Helgaas <bhelgaas@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-usb@vger.kernel.org,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Dan Williams <dan.j.williams@intel.com>,
"Reshetova, Elena" <elena.reshetova@intel.com>
Subject: Re: [PATCH v2 2/6] driver core: Add common support to skip probe for un-authorized devices
Date: Thu, 30 Sep 2021 10:17:09 -0700 [thread overview]
Message-ID: <f4b5a269-843f-6911-24fe-ebffb2bd4f9e@linux.intel.com> (raw)
In-Reply-To: <YVXWIVZupeAzT6bO@kroah.com>
>> The "it" that I referred to is the claim that no driver should be
>> touching hardware in their module init call. Andi seems to think
>> such drivers are worth working around with a special remap API.
> Andi is wrong.
While overall it's a small percentage of the total, there are still
quite a few drivers that do touch hardware in init functions. Sometimes
for good reasons -- they need to do some extra probing to discover
something that is not enumerated -- sometimes just because it's very old
legacy code that predates the modern driver model.
The legacy drivers could be fixed, but nobody really wants to touch them
anymore and they're impossible to test.
The drivers that probe something that is not enumerated in a standard
way have no choice, it cannot be implemented in a different way.
So instead we're using a "firewall" the prevents these drivers from
doing bad things by not allowing ioremap access unless opted in, and
also do some filtering on the IO ports The device filter is still the
primary mechanism, the ioremap filtering is just belts and suspenders
for those odd cases.
If you want we can send an exact list, we did some analysis using a
patched smatch tool.
-Andi
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
next prev parent reply other threads:[~2021-09-30 17:17 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210930010511.3387967-1-sathyanarayanan.kuppuswamy@linux.intel.com>
[not found] ` <20210930010511.3387967-2-sathyanarayanan.kuppuswamy@linux.intel.com>
2021-09-30 1:42 ` [PATCH v2 1/6] driver core: Move the "authorized" attribute from USB/Thunderbolt to core Alan Stern
2021-09-30 1:55 ` Dan Williams
[not found] ` <f9b7cf97-0a14-1c80-12ab-23213ec2f4f2@linux.intel.com>
2021-09-30 4:59 ` Dan Williams
2021-09-30 9:05 ` Rafael J. Wysocki
2021-09-30 14:59 ` Alan Stern
2021-09-30 15:25 ` Dan Williams
[not found] ` <CA+CmpXtXn5wjxwow5va5u9qHcQDLkd4Sh2dcqB545SXaxV1GkQ@mail.gmail.com>
2021-09-30 15:28 ` Dan Williams
[not found] ` <CA+CmpXvGCAny-WHGioJQHF9ZZ5pCaR-E_rw5oeE82xC30naVXg@mail.gmail.com>
2021-09-30 19:04 ` Dan Williams
[not found] ` <c701ca61-4e7d-1060-102f-8f92dd6e6802@linux.intel.com>
2021-09-30 20:23 ` Dan Williams
[not found] ` <20210930010511.3387967-3-sathyanarayanan.kuppuswamy@linux.intel.com>
2021-09-30 10:59 ` [PATCH v2 2/6] driver core: Add common support to skip probe for un-authorized devices Michael S. Tsirkin
2021-09-30 13:52 ` Greg Kroah-Hartman
2021-09-30 14:38 ` Michael S. Tsirkin
2021-09-30 14:49 ` Greg Kroah-Hartman
2021-09-30 15:00 ` Michael S. Tsirkin
2021-09-30 15:22 ` Greg Kroah-Hartman
2021-09-30 17:17 ` Andi Kleen [this message]
2021-09-30 17:23 ` Greg Kroah-Hartman
2021-09-30 19:15 ` Andi Kleen
2021-10-01 6:29 ` Greg Kroah-Hartman
2021-10-01 15:51 ` Alan Stern
2021-10-01 15:56 ` Andi Kleen
2021-09-30 14:43 ` Alan Stern
2021-09-30 14:48 ` Michael S. Tsirkin
2021-09-30 15:32 ` Alan Stern
2021-09-30 15:52 ` Michael S. Tsirkin
2021-09-30 14:58 ` Michael S. Tsirkin
2021-09-30 15:35 ` Alan Stern
2021-09-30 15:59 ` Michael S. Tsirkin
2021-09-30 19:23 ` Andi Kleen
2021-09-30 20:44 ` Alan Stern
2021-09-30 20:52 ` Dan Williams
2021-10-01 1:41 ` Alan Stern
2021-10-01 2:20 ` Dan Williams
2021-09-30 21:12 ` Andi Kleen
[not found] ` <20210930010511.3387967-5-sathyanarayanan.kuppuswamy@linux.intel.com>
2021-09-30 11:03 ` [PATCH v2 4/6] virtio: Initialize authorized attribute for confidential guest Michael S. Tsirkin
2021-09-30 13:36 ` Dan Williams
2021-09-30 13:49 ` Greg Kroah-Hartman
[not found] ` <6d1e2701-5095-d110-3b0a-2697abd0c489@linux.intel.com>
2021-09-30 15:20 ` Michael S. Tsirkin
2021-09-30 15:23 ` Greg Kroah-Hartman
[not found] ` <1cfdce51-6bb4-f7af-a86b-5854b6737253@linux.intel.com>
2021-09-30 19:30 ` Andi Kleen
2021-10-01 7:03 ` Greg Kroah-Hartman
2021-10-01 15:49 ` Andi Kleen
2021-10-02 11:04 ` Michael S. Tsirkin
2021-10-02 11:14 ` Greg Kroah-Hartman
2021-10-02 14:20 ` Andi Kleen
2021-10-02 14:44 ` Greg Kroah-Hartman
2021-10-02 18:40 ` Michael S. Tsirkin
2021-10-03 6:40 ` Greg Kroah-Hartman
2021-10-04 21:04 ` Dan Williams
2021-10-01 16:13 ` Dan Williams
2021-10-01 16:45 ` Alan Stern
2021-10-01 18:09 ` Dan Williams
2021-10-01 19:00 ` Alan Stern
2021-10-01 19:57 ` Dan Williams
[not found] ` <YVqONA0vhl0/H3QE@lahna>
2021-10-05 22:33 ` Dan Williams
2021-10-06 5:45 ` Greg Kroah-Hartman
2021-09-30 19:25 ` Andi Kleen
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=f4b5a269-843f-6911-24fe-ebffb2bd4f9e@linux.intel.com \
--to=ak@linux.intel.com \
--cc=YehezkelShB@gmail.com \
--cc=andreas.noever@gmail.com \
--cc=bhelgaas@google.com \
--cc=bp@alien8.de \
--cc=corbet@lwn.net \
--cc=dan.j.williams@intel.com \
--cc=elena.reshetova@intel.com \
--cc=gregkh@linuxfoundation.org \
--cc=knsathya@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=michael.jamet@intel.com \
--cc=mika.westerberg@linux.intel.com \
--cc=mingo@redhat.com \
--cc=mst@redhat.com \
--cc=rafael@kernel.org \
--cc=sathyanarayanan.kuppuswamy@linux.intel.com \
--cc=tglx@linutronix.de \
--cc=virtualization@lists.linux-foundation.org \
--cc=x86@kernel.org \
/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).