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[v8,3/5] arm64: KVM: add accessors to track guest/host only counters

Message ID 1544610573-28446-4-git-send-email-andrew.murray@arm.com (mailing list archive)
State New, archived
Headers show
Series arm64: Support perf event modifiers :G and :H | expand

Commit Message

Andrew Murray Dec. 12, 2018, 10:29 a.m. UTC 
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(+)

Comments

Suzuki K Poulose Dec. 12, 2018, 10:56 a.m. UTC | #1 
On 12/12/2018 10:29, Andrew Murray wrote:
> 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>
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Patch

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)