linux-kernel - Re: [PATCH v3 00/10] perf/amd/ibs: Fix sample period computations

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Message-ID: <c6bb1c11-c869-4e4d-82f1-f1efd2b2d7ec@amd.com>
Date: Mon, 16 Dec 2024 12:12:50 +0530
From: Ravi Bangoria <ravi.bangoria@....com>
To: peterz@...radead.org, mingo@...hat.com
Cc: acme@...nel.org, eranian@...gle.com, mark.rutland@....com,
 alexander.shishkin@...ux.intel.com, jolsa@...nel.org, irogers@...gle.com,
 adrian.hunter@...el.com, kan.liang@...ux.intel.com, tglx@...utronix.de,
 bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
 linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
 santosh.shukla@....com, ananth.narayan@....com, sandipan.das@....com,
 namhyung@...nel.org, Ravi Bangoria <ravi.bangoria@....com>
Subject: Re: [PATCH v3 00/10] perf/amd/ibs: Fix sample period computations

On 10-Dec-24 3:04 PM, Ravi Bangoria wrote:
> IBS Fetch and IBS Op PMUs have constraints on supported sample period
> values. The IBS hw behavior could be undefined if they are not followed.
> Currently, IBS driver does not honor them correctly and thus a malicious
> event could cause issues to the system. Fortunately, the IBS hw is very
> resilient so far and IBS PMUs are restricted to root only, so the attack
> vector is minimal. In any case, these are genuine bugs and must be fixed.
> 
> There were some conflicts with Namhyung's IBS patches[1] which are now
> in the tip tree, so rebased the series on tip/perf/core (02c56362a7d3).
> 
> v2: https://lore.kernel.org/r/20241206051713.991-1-ravi.bangoria@amd.com
> v2->v3:
>  - No code changes
>  - s/pmu/PMU/g
>  - Include unit test example in the commit description
> 
> [1]: https://lore.kernel.org/r/20241203180441.1634709-1-namhyung@kernel.org

Peter, Ingo, gentle ping.

Thanks,
Ravi