release/5.2.34/KVM-X86-Add-pv-tlb-shootdown-tracepoint.patch

From e7b7f3126a95cc97cf9b1de9e14ac22d5a985352 Mon Sep 17 00:00:00 2001
From: Wanpeng Li <wanpengli@tencent.com>
Date: Mon, 5 Aug 2019 10:03:24 +0800
Subject: [PATCH] KVM: X86: Add pv tlb shootdown tracepoint
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commit b382f44e98506bcb00acada0e30151a73e782a93 upstream.

Add pv tlb shootdown tracepoint.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 4d47a2631d1f..e11689b876d7 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -1462,6 +1462,25 @@ TRACE_EVENT(kvm_hv_send_ipi_ex,
 		  __entry->vector, __entry->format,
 		  __entry->valid_bank_mask)
 );
+
+TRACE_EVENT(kvm_pv_tlb_flush,
+	TP_PROTO(unsigned int vcpu_id, bool need_flush_tlb),
+	TP_ARGS(vcpu_id, need_flush_tlb),
+
+	TP_STRUCT__entry(
+		__field(	unsigned int,	vcpu_id		)
+		__field(	bool,	need_flush_tlb		)
+	),
+
+	TP_fast_assign(
+		__entry->vcpu_id	= vcpu_id;
+		__entry->need_flush_tlb = need_flush_tlb;
+	),
+
+	TP_printk("vcpu %u need_flush_tlb %s", __entry->vcpu_id,
+		__entry->need_flush_tlb ? "true" : "false")
+);
+
 #endif /* _TRACE_KVM_H */
 
 #undef TRACE_INCLUDE_PATH
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1241b67137b1..1b935e9e3f7d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2483,6 +2483,8 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
 	 * Doing a TLB flush here, on the guest's behalf, can avoid
 	 * expensive IPIs.
 	 */
+	trace_kvm_pv_tlb_flush(vcpu->vcpu_id,
+		vcpu->arch.st.steal.preempted & KVM_VCPU_FLUSH_TLB);
 	if (xchg(&vcpu->arch.st.steal.preempted, 0) & KVM_VCPU_FLUSH_TLB)
 		kvm_vcpu_flush_tlb(vcpu, false);
 
-- 
2.7.4