linux-kernel - Re: [PATCH 2/2] x86/pat: add functions to query specific cache mode availability

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Date:   Wed, 25 May 2022 10:37:53 +0200
From:   Jan Beulich <jbeulich@...e.com>
To:     Thorsten Leemhuis <regressions@...mhuis.info>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        xen-devel@...ts.xenproject.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, Juergen Gross <jgross@...e.com>,
        Chuck Zmudzinski <brchuckz@...scape.net>,
        regressions@...ts.linux.dev, stable@...r.kernel.org
Subject: Re: [PATCH 2/2] x86/pat: add functions to query specific cache mode
 availability

On 25.05.2022 09:45, Thorsten Leemhuis wrote:
> On 24.05.22 20:32, Chuck Zmudzinski wrote:
>> On 5/21/22 6:47 AM, Thorsten Leemhuis wrote:
>>> I'm not a developer and I'm don't known the details of this thread and
>>> the backstory of the regression, but it sounds like that's the approach
>>> that is needed here until someone comes up with a fix for the regression
>>> exposed by bdd8b6c98239.
>>>
>>> But if I'm wrong, please tell me.
>>
>> You are mostly right, I think. Reverting bdd8b6c98239 fixes
>> it. There is another way to fix it, though.
> 
> Yeah, I'm aware of it. But it seems...
> 
>> The patch proposed
>> by Jan Beulich also fixes the regression on my system, so as
>> the person reporting this is a regression, I would also be satisfied
>> with Jan's patch instead of reverting bdd8b6c98239 as a fix. Jan
>> posted his proposed patch here:
>>
>> https://lore.kernel.org/lkml/9385fa60-fa5d-f559-a137-6608408f88b0@suse.com/
> 
> ...that approach is not making any progress either?
> 
> Jan, can could provide a short status update here? I'd really like to
> get this regression fixed one way or another rather sooner than later,
> as this is taken way to long already IMHO.

What kind of status update could I provide? I've not heard back from
anyone of the maintainers, so I have no way to know what (if anything)
I need to do.

Jan