linux-kernel - [PATCH 05/32] KVM: x86/lapic: Add a trace point for guest virtual timer

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Message-ID: <4dfe5a137204456cd984fb0be7c1041898a3a91a.1770116050.git.isaku.yamahata@intel.com>
Date: Tue,  3 Feb 2026 10:16:48 -0800
From: isaku.yamahata@...el.com
To: kvm@...r.kernel.org
Cc: isaku.yamahata@...el.com,
	isaku.yamahata@...il.com,
	Paolo Bonzini <pbonzini@...hat.com>,
	Sean Christopherson <seanjc@...gle.com>,
	linux-kernel@...r.kernel.org,
	Yang Zhong <yang.zhong@...ux.intel.com>
Subject: [PATCH 05/32] KVM: x86/lapic: Add a trace point for guest virtual timer

From: Yang Zhong <yang.zhong@...ux.intel.com>

Add a trace point for changing the guest virtual timer, similar to the hv
timer case.

Co-developed-by: Yang Zhong <yang.zhong@...ux.intel.com>
Signed-off-by: Yang Zhong <yang.zhong@...ux.intel.com>
Co-developed-by: Isaku Yamahata <isaku.yamahata@...el.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/lapic.c |  5 +++++
 arch/x86/kvm/trace.h | 16 ++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 080245f6dac1..837f446eea41 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1848,6 +1848,9 @@ static void cancel_apic_virt_timer(struct kvm_lapic *apic)
 
 	kvm_x86_call(cancel_apic_virt_timer)(vcpu);
 	apic->lapic_timer.apic_virt_timer_in_use = false;
+
+	trace_kvm_apic_virt_timer_state(vcpu->vcpu_id,
+					apic->lapic_timer.apic_virt_timer_in_use);
 }
 
 static void apic_cancel_apic_virt_timer(struct kvm_lapic *apic)
@@ -1876,6 +1879,8 @@ static void apic_set_apic_virt_timer(struct kvm_lapic *apic)
 	kvm_x86_call(set_apic_virt_timer)(vcpu, vector);
 	kvm_x86_call(set_guest_tsc_deadline_virt)(vcpu, ktimer->tscdeadline);
 	ktimer->apic_virt_timer_in_use = true;
+
+	trace_kvm_apic_virt_timer_state(vcpu->vcpu_id, ktimer->apic_virt_timer_in_use);
 }
 
 static bool kvm_can_use_apic_virt_timer(struct kvm_vcpu *vcpu)
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index e79bc9cb7162..649d06f87619 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -1649,6 +1649,22 @@ TRACE_EVENT(kvm_hv_timer_state,
 			__entry->hv_timer_in_use)
 );
 
+TRACE_EVENT(kvm_apic_virt_timer_state,
+		TP_PROTO(unsigned int vcpu_id, unsigned int apic_virt_timer_in_use),
+		TP_ARGS(vcpu_id, apic_virt_timer_in_use),
+		TP_STRUCT__entry(
+			__field(unsigned int, vcpu_id)
+			__field(unsigned int, apic_virt_timer_in_use)
+			),
+		TP_fast_assign(
+			__entry->vcpu_id = vcpu_id;
+			__entry->apic_virt_timer_in_use = apic_virt_timer_in_use;
+			),
+		TP_printk("vcpu_id %x apic_virt_timer %x",
+			__entry->vcpu_id,
+			__entry->apic_virt_timer_in_use)
+);
+
 /*
  * Tracepoint for kvm_hv_flush_tlb.
  */
-- 
2.45.2