linux-kernel - [RFC PATCH v2 1/3] perf/core: Expose perf_event_{en,dis}able

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Date:   Thu, 22 Sep 2022 00:45:19 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>, wei.w.wang@...el.com,
        kan.liang@...ux.intel.com
Cc:     xiaoyao.li@...el.com, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [RFC PATCH v2 1/3] perf/core: Expose perf_event_{en,dis}able_local()

KVM needs them to disable/enable an Intel PT perf event before
vm-entry/after vm-exit.

Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>
---
 include/linux/perf_event.h | 1 +
 kernel/events/core.c       | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index ee8b9ecdc03b..fc5f3952d6a2 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1472,6 +1472,7 @@ extern int perf_swevent_get_recursion_context(void);
 extern void perf_swevent_put_recursion_context(int rctx);
 extern u64 perf_swevent_set_period(struct perf_event *event);
 extern void perf_event_enable(struct perf_event *event);
+extern void perf_event_enable_local(struct perf_event *event);
 extern void perf_event_disable(struct perf_event *event);
 extern void perf_event_disable_local(struct perf_event *event);
 extern void perf_event_disable_inatomic(struct perf_event *event);
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 2621fd24ad26..8324bb99c6bf 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2446,6 +2446,7 @@ void perf_event_disable_local(struct perf_event *event)
 {
 	event_function_local(event, __perf_event_disable, NULL);
 }
+EXPORT_SYMBOL_GPL(perf_event_disable_local);
 
 /*
  * Strictly speaking kernel users cannot create groups and therefore this
@@ -2984,6 +2985,12 @@ static void _perf_event_enable(struct perf_event *event)
 	event_function_call(event, __perf_event_enable, NULL);
 }
 
+void perf_event_enable_local(struct perf_event *event)
+{
+	event_function_local(event, __perf_event_enable, NULL);
+}
+EXPORT_SYMBOL_GPL(perf_event_enable_local);
+
 /*
  * See perf_event_disable();
  */
-- 
2.27.0