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Date:   Mon, 19 Nov 2018 11:46:46 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     Jordan Glover <Golden_Miller83@protonmail.ch>
Cc:     Alexey Budankov <alexey.budankov@linux.intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Kees Cook <keescook@chromium.org>,
        Jann Horn <jannh@google.com>, Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Andi Kleen <ak@linux.intel.com>,
        Jonatan Corbet <corbet@lwn.net>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@redhat.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Tvrtko Ursulin <tursulin@ursulin.net>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        "kernel-hardening@lists.openwall.com" 
        <kernel-hardening@lists.openwall.com>,
        "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>
Subject: Re: [PATCH v1 2/2]: Documentation/admin-guide: introduce
 perf-security.rst file
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On Mon, Nov 19, 2018 at 10:35:59AM +0000, Jordan Glover wrote:
> On Monday, November 19, 2018 6:42 AM, Alexey Budankov <alexey.budankov@linux.intel.com> wrote:
> > +>=3:
> >
> > -       Restrict *access* to PCL performance monitoring for unprivileged processes.
> >
> >
> > -       This is the default on Debian and Android [7]_ , [8]_ .
> 
> AFAIK there is no support for '+>=3' in mainline kernel[1].
> Debian and Android use out-of-tree patch for that[2].
> Maybe someone should upstream it?

NAK still stands on that. Alternative's have been proposed but so far
nobody that cared seems to care enough to implement those.