linux-kernel - [PATCH RFC 0/2] ignore LBR-related MSRs

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Date:   Wed,  6 Dec 2017 14:43:01 +0300
From:   Jan Dakinevich <jan.dakinevich@...tuozzo.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jan Dakinevich <jan.dakinevich@...tuozzo.com>,
        "Denis V . Lunev" <den@...tuozzo.com>,
        Roman Kagan <rkagan@...tuozzo.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kan Liang <kan.liang@...el.com>,
        Colin King <colin.king@...onical.com>,
        Stephane Eranian <eranian@...gle.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jin Yao <yao.jin@...ux.intel.com>, kvm@...r.kernel.org
Subject: [PATCH RFC 0/2] ignore LBR-related MSRs

w2k16 essentials fails to boot if underlying hypervisor lacks of support for 
LBR MSRs. To workaround the issue, it suggessted to ignore these MSRs (but not 
all).

The information, which MSRs are supported for specific platform is taken from
perf, it is the subject of the first patch. The second patch adds ignoring for
these MSRs to pmu_intel code of KVM.

TODO: use MSR load/store areas to make full support of LBR debug.

Jan Dakinevich (2):
  perf/x86/intel: make reusable LBR initialization code
  KVM: x86/vPMU: ignore access to LBR-related MSRs

 arch/x86/events/core.c            |   8 +-
 arch/x86/events/intel/core.c      |  59 +++------
 arch/x86/events/intel/lbr.c       | 272 +++++++++++++++++++++++++-------------
 arch/x86/events/perf_event.h      |  27 +---
 arch/x86/include/asm/kvm_host.h   |   2 +
 arch/x86/include/asm/perf_event.h |  11 ++
 arch/x86/kvm/pmu_intel.c          |  33 +++++
 7 files changed, 250 insertions(+), 162 deletions(-)

-- 
2.1.4