linux-kernel - [RFC PATCH 3/3] coresight: Support exclude_guest with Feat

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Message-Id: <20230804101317.460697-4-james.clark@arm.com>
Date:   Fri,  4 Aug 2023 11:13:13 +0100
From:   James Clark <james.clark@....com>
To:     coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.linux.dev
Cc:     James Clark <james.clark@....com>, Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 3/3] coresight: Support exclude_guest with Feat_TRF and nVHE

With nVHE the filters need to be applied before switching to the guest,
so supply the per-cpu filter status to KVM.

Signed-off-by: James Clark <james.clark@....com>
---
 drivers/hwtracing/coresight/coresight-etm-perf.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c
index 5ca6278baff4..f78f05e656f5 100644
--- a/drivers/hwtracing/coresight/coresight-etm-perf.c
+++ b/drivers/hwtracing/coresight/coresight-etm-perf.c
@@ -9,6 +9,7 @@
 #include <linux/coresight-pmu.h>
 #include <linux/cpumask.h>
 #include <linux/device.h>
+#include <linux/kvm_host.h>
 #include <linux/list.h>
 #include <linux/mm.h>
 #include <linux/init.h>
@@ -510,6 +511,7 @@ static void etm_event_start(struct perf_event *event, int flags)
 	}
 
 out:
+	kvm_etm_set_events(&event->attr);
 	/* Tell the perf core the event is alive */
 	event->hw.state = 0;
 	/* Save the event_data for this ETM */
@@ -627,6 +629,8 @@ static void etm_event_stop(struct perf_event *event, int mode)
 
 	/* Disabling the path make its elements available to other sessions */
 	coresight_disable_path(path);
+
+	kvm_etm_clr_events();
 }
 
 static int etm_event_add(struct perf_event *event, int mode)
-- 
2.34.1