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Subject: Re: [RFC 0/4] perf: Per PMU access controls (paranoid setting)
To:     Tvrtko Ursulin <tursulin@ursulin.net>, linux-kernel@vger.kernel.org
Cc:     Tvrtko Ursulin <tvrtko.ursulin@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@redhat.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Madhavan Srinivasan <maddy@linux.vnet.ibm.com>,
        Andi Kleen <ak@linux.intel.com>, x86@kernel.org
References: <20180626153642.5587-1-tvrtko.ursulin@linux.intel.com>
From:   Alexey Budankov <alexey.budankov@linux.intel.com>
Organization: Intel Corp.
Message-ID: <27559444-ca88-2c04-c85c-613116e9e51f@linux.intel.com>
Date:   Wed, 12 Sep 2018 09:52:29 +0300
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Hi,

Is there any plans or may be even progress on that so far?

Thanks,
Alexey

On 26.06.2018 18:36, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> 
> For situations where sysadmins might want to allow different level of
> access control for different PMUs, we start creating per-PMU
> perf_event_paranoid controls in sysfs.
> 
> These work in equivalent fashion as the existing perf_event_paranoid
> sysctl, which now becomes the parent control for each PMU.
> 
> On PMU registration the global/parent value will be inherited by each PMU,
> as it will be propagated to all registered PMUs when the sysctl is
> updated.
> 
> At any later point individual PMU access controls, located in
> <sysfs>/device/<pmu-name>/perf_event_paranoid, can be adjusted to achieve
> fine grained access control.
> 
> Discussion from previous posting:
> https://lkml.org/lkml/2018/5/21/156
> 
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: "H. Peter Anvin" <hpa@zytor.com>
> Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
> Cc: Jiri Olsa <jolsa@redhat.com>
> Cc: Namhyung Kim <namhyung@kernel.org>
> Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
> Cc: Andi Kleen <ak@linux.intel.com>
> Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
> Cc: linux-kernel@vger.kernel.org
> Cc: x86@kernel.org
> 
> Tvrtko Ursulin (4):
>   perf: Move some access checks later in perf_event_open
>   perf: Pass pmu pointer to perf_paranoid_* helpers
>   perf: Allow per PMU access control
>   perf Documentation: Document the per PMU perf_event_paranoid interface
> 
>  .../sysfs-bus-event_source-devices-events     |  14 +++
>  arch/powerpc/perf/core-book3s.c               |   2 +-
>  arch/x86/events/intel/bts.c                   |   2 +-
>  arch/x86/events/intel/core.c                  |   2 +-
>  arch/x86/events/intel/p4.c                    |   2 +-
>  include/linux/perf_event.h                    |  18 ++-
>  kernel/events/core.c                          | 104 +++++++++++++++---
>  kernel/sysctl.c                               |   4 +-
>  kernel/trace/trace_event_perf.c               |   6 +-
>  9 files changed, 123 insertions(+), 31 deletions(-)
>