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    Subject[RFC PATCH 01/41] perf: x86/intel: Support PERF_PMU_CAP_VPMU_PASSTHROUGH
    Date
    From: Kan Liang <kan.liang@linux.intel.com>

    Define and apply the PERF_PMU_CAP_VPMU_PASSTHROUGH flag for the version 4
    and later PMUs, which includes the improvements for virtualization.

    Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
    Signed-off-by: Mingwei Zhang <mizhang@google.com>
    ---
    arch/x86/events/intel/core.c | 6 ++++++
    include/linux/perf_event.h | 1 +
    2 files changed, 7 insertions(+)

    diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
    index a08f794a0e79..cf790c37757a 100644
    --- a/arch/x86/events/intel/core.c
    +++ b/arch/x86/events/intel/core.c
    @@ -4662,6 +4662,9 @@ static void intel_pmu_check_hybrid_pmus(struct x86_hybrid_pmu *pmu)
    else
    pmu->pmu.capabilities |= ~PERF_PMU_CAP_AUX_OUTPUT;

    + if (x86_pmu.version >= 4)
    + pmu->pmu.capabilities |= PERF_PMU_CAP_VPMU_PASSTHROUGH;
    +
    intel_pmu_check_event_constraints(pmu->event_constraints,
    pmu->num_counters,
    pmu->num_counters_fixed,
    @@ -6137,6 +6140,9 @@ __init int intel_pmu_init(void)
    pr_cont(" AnyThread deprecated, ");
    }

    + if (version >= 4)
    + x86_get_pmu(smp_processor_id())->capabilities |= PERF_PMU_CAP_VPMU_PASSTHROUGH;
    +
    /*
    * Install the hw-cache-events table:
    */
    diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
    index afb028c54f33..60eff413dbba 100644
    --- a/include/linux/perf_event.h
    +++ b/include/linux/perf_event.h
    @@ -291,6 +291,7 @@ struct perf_event_pmu_context;
    #define PERF_PMU_CAP_NO_EXCLUDE 0x0040
    #define PERF_PMU_CAP_AUX_OUTPUT 0x0080
    #define PERF_PMU_CAP_EXTENDED_HW_TYPE 0x0100
    +#define PERF_PMU_CAP_VPMU_PASSTHROUGH 0x0200

    struct perf_output_handle;

    --
    2.34.1

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