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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: Suzuki K Poulose <suzuki.poulose@arm.com>,
	kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org,
	Julien Thierry <julien.thierry@arm.com>
Subject: [PATCH v8 3/5] arm64: KVM: add accessors to track guest/host only counters
Date: Wed, 12 Dec 2018 10:29:31 +0000	[thread overview]
Message-ID: <1544610573-28446-4-git-send-email-andrew.murray@arm.com> (raw)
In-Reply-To: <1544610573-28446-1-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>
---
 arch/arm64/include/asm/kvm_host.h | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 1d3ca91..50f9d4c 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -205,6 +205,11 @@ 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;
@@ -472,11 +477,33 @@ 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:[~2018-12-12 10:29 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-12 10:29 [PATCH v8 0/5] arm64: Support perf event modifiers :G and :H Andrew Murray
2018-12-12 10:29 ` [PATCH v8 1/5] arm64: arm_pmu: remove unnecessary isb instruction Andrew Murray
2018-12-12 10:29 ` [PATCH v8 2/5] arm64: KVM: encapsulate kvm_cpu_context in kvm_host_data Andrew Murray
2018-12-12 10:37   ` Suzuki K Poulose
2018-12-12 12:31     ` Andrew Murray
2018-12-18 11:40   ` Christoffer Dall
2018-12-12 10:29 ` Andrew Murray [this message]
2018-12-12 10:56   ` [PATCH v8 3/5] arm64: KVM: add accessors to track guest/host only counters Suzuki K Poulose
2018-12-12 10:29 ` [PATCH v8 4/5] arm64: arm_pmu: Add support for exclude_host/exclude_guest attributes Andrew Murray
2018-12-12 10:42   ` Suzuki K Poulose
2018-12-12 10:47     ` Julien Thierry
2018-12-12 10:51       ` Suzuki K Poulose
2018-12-12 10:55   ` Suzuki K Poulose
2018-12-12 14:38     ` Andrew Murray
2018-12-18 12:02   ` Christoffer Dall
2018-12-18 13:25     ` Andrew Murray
2018-12-18 14:38       ` Christoffer Dall
2018-12-18 16:27         ` Andrew Murray
2018-12-18 18:51           ` Christoffer Dall
2018-12-18 19:19             ` Andrew Jones
2019-01-04 15:32     ` Will Deacon
2019-01-08 10:18       ` Christoffer Dall
2019-01-08 11:25         ` Andrew Murray
2019-01-08 11:50           ` Marc Zyngier
2019-01-08 12:03             ` Christoffer Dall
2019-01-08 12:12               ` Marc Zyngier
2019-01-08 12:20                 ` Christoffer Dall
2019-01-08 12:14           ` Christoffer Dall
2019-01-08 12:39             ` Andrew Murray
2018-12-12 10:29 ` [PATCH v8 5/5] arm64: KVM: Enable support for :G/:H perf event modifiers Andrew Murray
2018-12-12 10:53   ` Suzuki K Poulose
2018-12-12 14:46     ` Andrew Murray

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