From: Sandipan Das <sandipan.das@xxxxxxx> Apply the PERF_PMU_CAP_MEDIATED_VPMU flag for version 2 and later implementations of the core PMU. Aside from having Global Control and Status registers, virtualizing the PMU using the mediated model requires an interface to set or clear the overflow bits in the Global Status MSRs while restoring or saving the PMU context of a vCPU. PerfMonV2-capable hardware has additional MSRs for this purpose, namely PerfCntrGlobalStatusSet and PerfCntrGlobalStatusClr, thereby making it suitable for use with mediated vPMU. Signed-off-by: Sandipan Das <sandipan.das@xxxxxxx> Signed-off-by: Mingwei Zhang <mizhang@xxxxxxxxxx> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx> --- arch/x86/events/amd/core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c index b20661b8621d..8179fb5f1ee3 100644 --- a/arch/x86/events/amd/core.c +++ b/arch/x86/events/amd/core.c @@ -1433,6 +1433,8 @@ static int __init amd_core_pmu_init(void) amd_pmu_global_cntr_mask = x86_pmu.cntr_mask64; + x86_get_pmu(smp_processor_id())->capabilities |= PERF_PMU_CAP_MEDIATED_VPMU; + /* Update PMC handling functions */ x86_pmu.enable_all = amd_pmu_v2_enable_all; x86_pmu.disable_all = amd_pmu_v2_disable_all; -- 2.50.1.565.gc32cd1483b-goog
