linux-kernel - [PATCH v4 8/9] arm: KVM: Enable support for host pmu

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Date:   Tue, 31 Jan 2017 17:16:29 +0000
From:   Punit Agrawal <punit.agrawal@....com>
To:     kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org
Cc:     Punit Agrawal <punit.agrawal@....com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>
Subject: [PATCH v4 8/9] arm: KVM: Enable support for host pmu

Add the Kconfig option and Makefile updates to enable the recently added
support for host pmu.

Signed-off-by: Punit Agrawal <punit.agrawal@....com>
Cc: Christoffer Dall <christoffer.dall@...aro.org>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Russell King <linux@...linux.org.uk>
---
 arch/arm/include/asm/kvm_host.h | 8 ++++++++
 arch/arm/kvm/Kconfig            | 1 +
 arch/arm/kvm/Makefile           | 1 +
 3 files changed, 10 insertions(+)

diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 26f0c8a0b790..b530c85db894 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -289,6 +289,14 @@ static inline int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext)
 int kvm_perf_init(void);
 int kvm_perf_teardown(void);
 
+#if !defined(CONFIG_KVM_HOST_PMU)
+static inline int arm_host_pmu_init(void) { return 0; }
+static inline void arm_host_pmu_teardown(void) { }
+#else
+int arm_host_pmu_init(void);
+void arm_host_pmu_teardown(void);
+#endif
+
 void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
 
 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig
index 90d0176fb30d..fbc09bd161fd 100644
--- a/arch/arm/kvm/Kconfig
+++ b/arch/arm/kvm/Kconfig
@@ -30,6 +30,7 @@ config KVM
 	select SRCU
 	select MMU_NOTIFIER
 	select KVM_VFIO
+	select KVM_HOST_PMU if PERF_EVENTS
 	select HAVE_KVM_EVENTFD
 	select HAVE_KVM_IRQFD
 	select HAVE_KVM_IRQCHIP
diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile
index d571243ab4d1..639aaef165f3 100644
--- a/arch/arm/kvm/Makefile
+++ b/arch/arm/kvm/Makefile
@@ -35,3 +35,4 @@ obj-y += $(KVM)/arm/vgic/vgic-kvm-device.o
 obj-y += $(KVM)/arm/vgic/vgic-its.o
 obj-y += $(KVM)/irqchip.o
 obj-y += $(KVM)/arm/arch_timer.o
+obj-$(CONFIG_KVM_HOST_PMU) += $(KVM)/host_pmu.o $(KVM)/arm/host_pmu_events.o
-- 
2.11.0