linux-kernel - [PATCH 4/8] perf: pmuv3: Add wrappers for KVM accesses

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Message-ID: <20230126204444.2204061-5-zalbassam@google.com>
Date:   Thu, 26 Jan 2023 15:44:40 -0500
From:   Zaid Al-Bassam <zalbassam@...gle.com>
To:     Jesus Sanchez-Palencia <jesussanp@...gle.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        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>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Zenghui Yu <yuzenghui@...wei.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, kvmarm@...ts.linux.dev,
        kvmarm@...ts.cs.columbia.edu
Cc:     Zaid Al-Bassam <zalbassam@...gle.com>
Subject: [PATCH 4/8] perf: pmuv3: Add wrappers for KVM accesses

KVM host support is available only on arm64. This patch adds wrappers
to the KVM host function references in the arm_pmuv3.c, so that it is
up to architecture to populate these wrappers if supported.

Signed-off-by: Zaid Al-Bassam <zalbassam@...gle.com>
---
 arch/arm64/include/asm/arm_pmuv3.h | 16 ++++++++++++++++
 drivers/perf/arm_pmuv3.c           | 11 +++++------
 2 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/include/asm/arm_pmuv3.h b/arch/arm64/include/asm/arm_pmuv3.h
index f41a354d1022..9f2a48f5340c 100644
--- a/arch/arm64/include/asm/arm_pmuv3.h
+++ b/arch/arm64/include/asm/arm_pmuv3.h
@@ -20,6 +20,7 @@
 
 #include <asm/cpufeature.h>
 #include <asm/sysreg.h>
+#include <linux/kvm_host.h>
 
 /*
  * This code is really good
@@ -191,4 +192,19 @@ static inline u32 read_pmceid1(void)
 	return read_sysreg(pmceid1_el0);
 }
 
+static inline void armv8pmu_kvm_set_events(u32 set, struct perf_event_attr *attr)
+{
+	kvm_set_pmu_events(set, attr);
+}
+
+static inline void armv8pmu_kvm_clr_events(u32 clr)
+{
+	kvm_clr_pmu_events(clr);
+}
+
+static inline bool armv8pmu_kvm_counter_deferred(struct perf_event_attr *attr)
+{
+	return kvm_pmu_counter_deferred(attr);
+}
+
 #endif
diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c
index 505f0758260c..d7063dd52827 100644
--- a/drivers/perf/arm_pmuv3.c
+++ b/drivers/perf/arm_pmuv3.c
@@ -16,7 +16,6 @@
 
 #include <linux/acpi.h>
 #include <linux/clocksource.h>
-#include <linux/kvm_host.h>
 #include <linux/of.h>
 #include <linux/perf/arm_pmu.h>
 #include <linux/perf/arm_pmuv3.h>
@@ -607,10 +606,10 @@ static inline void armv8pmu_enable_event_counter(struct perf_event *event)
 	struct perf_event_attr *attr = &event->attr;
 	u32 mask = armv8pmu_event_cnten_mask(event);
 
-	kvm_set_pmu_events(mask, attr);
+	armv8pmu_kvm_set_events(mask, attr);
 
 	/* We rely on the hypervisor switch code to enable guest counters */
-	if (!kvm_pmu_counter_deferred(attr))
+	if (!armv8pmu_kvm_counter_deferred(attr))
 		armv8pmu_enable_counter(mask);
 }
 
@@ -629,10 +628,10 @@ static inline void armv8pmu_disable_event_counter(struct perf_event *event)
 	struct perf_event_attr *attr = &event->attr;
 	u32 mask = armv8pmu_event_cnten_mask(event);
 
-	kvm_clr_pmu_events(mask);
+	armv8pmu_kvm_clr_events(mask);
 
 	/* We rely on the hypervisor switch code to disable guest counters */
-	if (!kvm_pmu_counter_deferred(attr))
+	if (!armv8pmu_kvm_counter_deferred(attr))
 		armv8pmu_disable_counter(mask);
 }
 
@@ -974,7 +973,7 @@ static void armv8pmu_reset(void *info)
 	armv8pmu_disable_intens(U32_MAX);
 
 	/* Clear the counters we flip at guest entry/exit */
-	kvm_clr_pmu_events(U32_MAX);
+	armv8pmu_kvm_clr_events(U32_MAX);
 
 	/*
 	 * Initialize & Reset PMNC. Request overflow interrupt for
-- 
2.39.0.246.g2a6d74b583-goog