linux-kernel - Re: [Patch v9 10/12] perf/x86/intel: Update dyn_constranit base on PEBS event precise level

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251107082845.GB1508773@noisy.programming.kicks-ass.net>
Date: Fri, 7 Nov 2025 09:28:45 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: "Mi, Dapeng" <dapeng1.mi@...ux.intel.com>
Cc: Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Eranian Stephane <eranian@...gle.com>, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org, Dapeng Mi <dapeng1.mi@...el.com>,
	Zide Chen <zide.chen@...el.com>,
	Falcon Thomas <thomas.falcon@...el.com>,
	Xudong Hao <xudong.hao@...el.com>
Subject: Re: [Patch v9 10/12] perf/x86/intel: Update dyn_constranit base on
 PEBS event precise level

On Fri, Nov 07, 2025 at 02:11:09PM +0800, Mi, Dapeng wrote:
> 
> On 11/6/2025 10:52 PM, Peter Zijlstra wrote:
> > On Wed, Oct 29, 2025 at 06:21:34PM +0800, Dapeng Mi wrote:
> >> arch-PEBS provides CPUIDs to enumerate which counters support PEBS
> >> sampling and precise distribution PEBS sampling. Thus PEBS constraints
> >> should be dynamically configured base on these counter and precise
> >> distribution bitmap instead of defining them statically.
> >>
> >> Update event dyn_constraint base on PEBS event precise level.
> > What happened to this:
> >
> >   https://lore.kernel.org/all/e0b25b3e-aec0-4c43-9ab2-907186b56c71@linux.intel.com/
> 
> About the issue, Kan ever posted a patch to mitigate the risk, but it seems
> the patch is not merged yet.
> 
> https://lore.kernel.org/all/20250512175542.2000708-1-kan.liang@linux.intel.com/
> 

Clearly it became a victim of some scatter brained maintainer or
something.

Let me stick that near this set and go read the last few patches.