linux-kernel - [RFC PATCH 01/41] perf: x86/intel: Support PERF_PMU_CAP_VPMU

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Message-Id: <20240126085444.324918-2-xiong.y.zhang@linux.intel.com>
Date: Fri, 26 Jan 2024 16:54:04 +0800
From: Xiong Zhang <xiong.y.zhang@...ux.intel.com>
To: seanjc@...gle.com,
	pbonzini@...hat.com,
	peterz@...radead.org,
	mizhang@...gle.com,
	kan.liang@...el.com,
	zhenyuw@...ux.intel.com,
	dapeng1.mi@...ux.intel.com,
	jmattson@...gle.com
Cc: kvm@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	zhiyuan.lv@...el.com,
	eranian@...gle.com,
	irogers@...gle.com,
	samantha.alt@...el.com,
	like.xu.linux@...il.com,
	chao.gao@...el.com,
	xiong.y.zhang@...ux.intel.com,
	Kan Liang <kan.liang@...ux.intel.com>
Subject: [RFC PATCH 01/41] perf: x86/intel: Support PERF_PMU_CAP_VPMU_PASSTHROUGH

From: Kan Liang <kan.liang@...ux.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@...ux.intel.com>
Signed-off-by: Mingwei Zhang <mizhang@...gle.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