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perf/x86/intel: Support PERF_PMU_CAP_MEDIATED_VPMU

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Apply the PERF_PMU_CAP_MEDIATED_VPMU for Intel core PMU. It only indicates
that the perf side of core PMU is ready to support the mediated vPMU.
Besides the capability, the hypervisor, a.k.a. KVM, still needs to check
the PMU version and other PMU features/capabilities to decide whether to
enable support mediated vPMUs.

[sean: massage changelog]
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Mingwei Zhang <mizhang@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Xudong Hao <xudong.hao@intel.com>
Link: https://patch.msgid.link/20251206001720.468579-13-seanjc@google.com
This commit is contained in:
Kan Liang 2025-12-05 16:16:48 -08:00 committed by Peter Zijlstra
parent c8824a95d9
commit 4280d79587
1 changed files with 5 additions and 0 deletions
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5
arch/x86/events/intel/core.c
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@ -5695,6 +5695,8 @@ static void intel_pmu_check_hybrid_pmus(struct x86_hybrid_pmu *pmu)
else
pmu->intel_ctrl &= ~GLOBAL_CTRL_EN_PERF_METRICS;
pmu->pmu.capabilities |= PERF_PMU_CAP_MEDIATED_VPMU;
intel_pmu_check_event_constraints_all(&pmu->pmu);
intel_pmu_check_extra_regs(pmu->extra_regs);
@ -7314,6 +7316,9 @@ __init int intel_pmu_init(void)
pr_cont(" AnyThread deprecated, ");
}
/* The perf side of core PMU is ready to support the mediated vPMU. */
x86_get_pmu(smp_processor_id())->capabilities |= PERF_PMU_CAP_MEDIATED_VPMU;
/*
* Many features on and after V6 require dynamic constraint,
* e.g., Arch PEBS, ACR.