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From: Andrew Murray <andrew.murray@arm.com>
To: Christoffer Dall <christoffer.dall@arm.com>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Mark Rutland <mark.rutland@arm.com>
Cc: Julien Thierry <julien.thierry@arm.com>,
	kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org,
	Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH v10 3/5] arm64: KVM: add accessors to track guest/host only counters
Date: Mon, 14 Jan 2019 16:11:46 +0000	[thread overview]
Message-ID: <1547482308-29839-4-git-send-email-andrew.murray@arm.com> (raw)
In-Reply-To: <1547482308-29839-1-git-send-email-andrew.murray@arm.com>

In order to effeciently enable/disable guest/host only perf counters
at guest entry/exit we add bitfields to kvm_cpu_context for guest and
host events as well as accessors for updating them.

Signed-off-by: Andrew Murray <andrew.murray@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 arch/arm64/include/asm/kvm_host.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 26fd935..cbfe3d1 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -206,8 +206,14 @@ struct kvm_cpu_context {
 	struct kvm_vcpu *__hyp_running_vcpu;
 };
 
+struct kvm_pmu_events {
+	u32 events_host;
+	u32 events_guest;
+};
+
 struct kvm_host_data {
 	struct kvm_cpu_context host_ctxt;
+	struct kvm_pmu_events pmu_events;
 };
 
 typedef struct kvm_host_data kvm_host_data_t;
@@ -468,11 +474,33 @@ void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu);
 void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu);
 void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu);
 
+#define KVM_PMU_EVENTS_HOST	1
+#define KVM_PMU_EVENTS_GUEST	2
+
 #ifdef CONFIG_KVM /* Avoid conflicts with core headers if CONFIG_KVM=n */
 static inline int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu)
 {
 	return kvm_arch_vcpu_run_map_fp(vcpu);
 }
+static inline void kvm_set_pmu_events(u32 set, int flags)
+{
+	struct kvm_host_data *ctx = this_cpu_ptr(&kvm_host_data);
+
+	if (flags & KVM_PMU_EVENTS_HOST)
+		ctx->pmu_events.events_host |= set;
+	if (flags & KVM_PMU_EVENTS_GUEST)
+		ctx->pmu_events.events_guest |= set;
+}
+static inline void kvm_clr_pmu_events(u32 clr)
+{
+	struct kvm_host_data *ctx = this_cpu_ptr(&kvm_host_data);
+
+	ctx->pmu_events.events_host &= ~clr;
+	ctx->pmu_events.events_guest &= ~clr;
+}
+#else
+static inline void kvm_set_pmu_events(u32 set, int flags) {}
+static inline void kvm_clr_pmu_events(u32 clr) {}
 #endif
 
 static inline void kvm_arm_vhe_guest_enter(void)
-- 
2.7.4


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  parent reply	other threads:[~2019-01-14 16:12 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-14 16:11 [PATCH v10 0/5] arm64: Support perf event modifiers :G and :H Andrew Murray
2019-01-14 16:11 ` [PATCH v10 1/5] arm64: arm_pmu: remove unnecessary isb instruction Andrew Murray
2019-01-14 16:11 ` [PATCH v10 2/5] arm64: KVM: encapsulate kvm_cpu_context in kvm_host_data Andrew Murray
2019-01-14 16:11 ` Andrew Murray [this message]
2019-01-14 16:11 ` [PATCH v10 4/5] arm64: arm_pmu: Add support for exclude_host/exclude_guest attributes Andrew Murray
2019-02-11 11:26   ` Will Deacon
2019-02-18 21:53   ` Christoffer Dall
2019-02-20 16:15     ` Andrew Murray
2019-02-26 12:44       ` Christoffer Dall
2019-03-04 11:14         ` Andrew Murray
2019-03-05 11:45           ` Andrew Murray
2019-03-06  8:42             ` Christoffer Dall
2019-01-14 16:11 ` [PATCH v10 5/5] arm64: KVM: Enable support for :G/:H perf event modifiers Andrew Murray
2019-02-18 22:00   ` Christoffer Dall
2019-03-04  9:40     ` Andrew Murray

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