From: Chuck Zmudzinski <brchuckz@netscape.net>
To: Juergen Gross <jgross@suse.com>,
xen-devel@lists.xenproject.org, x86@kernel.org,
linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org,
dri-devel@lists.freedesktop.org
Cc: jbeulich@suse.com, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Jani Nikula <jani.nikula@linux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@intel.com>,
Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
pkg-xen-devel@alioth-lists.debian.net
Subject: Re: [PATCH 2/2] x86/pat: add functions to query specific cache mode availability
Date: Thu, 19 May 2022 22:21:42 -0400 [thread overview]
Message-ID: <c9c4ca95-0423-a50f-f417-776ccc7904e7@netscape.net> (raw)
In-Reply-To: <788dc391-6a20-5c03-9613-9f22fcc125f1@netscape.net>
On 5/19/22 10:15 PM, Chuck Zmudzinski wrote:
> On 5/3/22 9:22 AM, Juergen Gross wrote:
>> Some drivers are using pat_enabled() in order to test availability of
>> special caching modes (WC and UC-). This will lead to false negatives
>> in case the system was booted e.g. with the "nopat" variant and the
>> BIOS did setup the PAT MSR supporting the queried mode, or if the
>> system is running as a Xen PV guest.
> Hello,
>
> I am also getting a false positive
Sorry, I meant false negative here, not false
positive.
Chuck
> in a Xen Dom0 from
> pat_enabled() where bdd8b6c98239 patched the file
>
> drivers/gpu/drm/i915/gem/i915_gem_pages.c
>
> I think this patch also needs to touch that file to
> fix the issue I am seeing.
...
next prev parent reply other threads:[~2022-05-20 2:21 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-03 13:22 [PATCH 0/2] x86/pat: fix querying available caching modes Juergen Gross
2022-05-03 13:22 ` [PATCH 1/2] x86/pat: fix x86_has_pat_wp() Juergen Gross
2022-05-27 10:21 ` Juergen Gross
2022-06-14 15:09 ` Juergen Gross
2022-06-20 5:22 ` Thorsten Leemhuis
2022-06-20 5:30 ` Juergen Gross
2022-06-20 6:15 ` Thorsten Leemhuis
2022-06-20 10:26 ` Borislav Petkov
2022-06-20 10:41 ` Juergen Gross
2022-06-20 15:27 ` Dave Hansen
2022-06-20 15:34 ` Juergen Gross
2022-05-03 13:22 ` [PATCH 2/2] x86/pat: add functions to query specific cache mode availability Juergen Gross
2022-05-04 8:31 ` Jan Beulich
2022-05-04 9:14 ` Juergen Gross
2022-05-04 9:51 ` Jan Beulich
2022-05-20 4:43 ` Chuck Zmudzinski
2022-05-20 5:56 ` Chuck Zmudzinski
2022-05-20 6:05 ` Jan Beulich
2022-05-20 6:59 ` Chuck Zmudzinski
2022-05-20 8:30 ` Chuck Zmudzinski
2022-05-20 9:41 ` Jan Beulich
2022-05-20 13:33 ` Chuck Zmudzinski
2022-05-20 14:06 ` Jan Beulich
2022-05-20 14:48 ` Chuck Zmudzinski
2022-05-21 10:47 ` Thorsten Leemhuis
2022-05-24 18:32 ` Chuck Zmudzinski
2022-05-25 7:45 ` Thorsten Leemhuis
2022-05-25 8:04 ` Juergen Gross
2022-05-25 8:37 ` Jan Beulich
2022-05-25 8:51 ` Thorsten Leemhuis
2022-05-25 19:25 ` Chuck Zmudzinski
2022-05-20 15:46 ` [REGRESSION} " Chuck Zmudzinski
2022-05-20 17:13 ` Chuck Zmudzinski
2022-05-20 17:17 ` Chuck Zmudzinski
2022-05-18 13:45 ` Christoph Hellwig
2022-05-20 2:15 ` Chuck Zmudzinski
2022-05-20 2:21 ` Chuck Zmudzinski [this message]
2022-05-21 13:24 ` Chuck Zmudzinski
2022-07-11 9:46 ` [tip: x86/urgent] x86/pat: Fix x86_has_pat_wp() tip-bot2 for Juergen Gross
2022-07-13 10:45 ` tip-bot2 for Juergen Gross
2022-07-13 10:52 ` tip-bot2 for Juergen Gross
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=c9c4ca95-0423-a50f-f417-776ccc7904e7@netscape.net \
--to=brchuckz@netscape.net \
--cc=airlied@linux.ie \
--cc=bp@alien8.de \
--cc=daniel@ffwll.ch \
--cc=dave.hansen@linux.intel.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=hpa@zytor.com \
--cc=intel-gfx@lists.freedesktop.org \
--cc=jani.nikula@linux.intel.com \
--cc=jbeulich@suse.com \
--cc=jgross@suse.com \
--cc=joonas.lahtinen@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=pkg-xen-devel@alioth-lists.debian.net \
--cc=rodrigo.vivi@intel.com \
--cc=tglx@linutronix.de \
--cc=tvrtko.ursulin@linux.intel.com \
--cc=x86@kernel.org \
--cc=xen-devel@lists.xenproject.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).