linux-kernel - [PATCH v5 02/44] perf: Add generic exclude

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Message-ID: <20250806195706.1650976-3-seanjc@google.com>
Date: Wed,  6 Aug 2025 12:56:24 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
	Tianrui Zhao <zhaotianrui@...ngson.cn>, Bibo Mao <maobibo@...ngson.cn>, 
	Huacai Chen <chenhuacai@...nel.org>, Anup Patel <anup@...infault.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Xin Li <xin@...or.com>, "H. Peter Anvin" <hpa@...or.com>, 
	Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
	kvm@...r.kernel.org, loongarch@...ts.linux.dev, kvm-riscv@...ts.infradead.org, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, Kan Liang <kan.liang@...ux.intel.com>, 
	Yongwei Ma <yongwei.ma@...el.com>, Mingwei Zhang <mizhang@...gle.com>, 
	Xiong Zhang <xiong.y.zhang@...ux.intel.com>, Sandipan Das <sandipan.das@....com>, 
	Dapeng Mi <dapeng1.mi@...ux.intel.com>
Subject: [PATCH v5 02/44] perf: Add generic exclude_guest support

From: Kan Liang <kan.liang@...ux.intel.com>

Only KVM knows the exact time when a guest is entering/exiting. Expose
two interfaces to KVM to switch the ownership of the PMU resources.

All the pinned events must be scheduled in first. Extend the
perf_event_sched_in() helper to support extra flag, e.g., EVENT_GUEST.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
Signed-off-by: Mingwei Zhang <mizhang@...gle.com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 kernel/events/core.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index d4528554528d..3a98e11d8efc 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2866,14 +2866,15 @@ static void task_ctx_sched_out(struct perf_event_context *ctx,
 
 static void perf_event_sched_in(struct perf_cpu_context *cpuctx,
 				struct perf_event_context *ctx,
-				struct pmu *pmu)
+				struct pmu *pmu,
+				enum event_type_t event_type)
 {
-	ctx_sched_in(&cpuctx->ctx, pmu, EVENT_PINNED);
+	ctx_sched_in(&cpuctx->ctx, pmu, EVENT_PINNED | event_type);
 	if (ctx)
-		 ctx_sched_in(ctx, pmu, EVENT_PINNED);
-	ctx_sched_in(&cpuctx->ctx, pmu, EVENT_FLEXIBLE);
+		ctx_sched_in(ctx, pmu, EVENT_PINNED | event_type);
+	ctx_sched_in(&cpuctx->ctx, pmu, EVENT_FLEXIBLE | event_type);
 	if (ctx)
-		 ctx_sched_in(ctx, pmu, EVENT_FLEXIBLE);
+		ctx_sched_in(ctx, pmu, EVENT_FLEXIBLE | event_type);
 }
 
 /*
@@ -2929,7 +2930,7 @@ static void ctx_resched(struct perf_cpu_context *cpuctx,
 	else if (event_type & EVENT_PINNED)
 		ctx_sched_out(&cpuctx->ctx, pmu, EVENT_FLEXIBLE);
 
-	perf_event_sched_in(cpuctx, task_ctx, pmu);
+	perf_event_sched_in(cpuctx, task_ctx, pmu, 0);
 
 	for_each_epc(epc, &cpuctx->ctx, pmu, 0)
 		perf_pmu_enable(epc->pmu);
@@ -4147,7 +4148,7 @@ static void perf_event_context_sched_in(struct task_struct *task)
 		ctx_sched_out(&cpuctx->ctx, NULL, EVENT_FLEXIBLE);
 	}
 
-	perf_event_sched_in(cpuctx, ctx, NULL);
+	perf_event_sched_in(cpuctx, ctx, NULL, 0);
 
 	perf_ctx_sched_task_cb(cpuctx->task_ctx, task, true);
 
-- 
2.50.1.565.gc32cd1483b-goog