linux-kernel - [PATCH 07/32] KVM: VMX: Update APIC timer virtualization on apicv changed

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Message-ID: <5f8655049106de981021d3d17bedc56574756678.1770116050.git.isaku.yamahata@intel.com>
Date: Tue,  3 Feb 2026 10:16:50 -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
Subject: [PATCH 07/32] KVM: VMX: Update APIC timer virtualization on apicv changed

From: Isaku Yamahata <isaku.yamahata@...el.com>

VMX APIC timer virtualization requires the virtual-interrupt delivery.
It's part of KVM apicv, and when apicv state is changed, the
refresh_apicv_exec_ctrl() callback is invoked.  Export a lapic function to
update which timer to use for APIC timer emulation and make the VMX backend
call it.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/lapic.c   | 6 ++++++
 arch/x86/kvm/lapic.h   | 1 +
 arch/x86/kvm/vmx/vmx.c | 2 ++
 3 files changed, 9 insertions(+)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 837f446eea41..a2f714eb78b1 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1898,6 +1898,12 @@ static void apic_update_apic_virt_timer(struct kvm_lapic *apic)
 		apic_cancel_apic_virt_timer(apic);
 }
 
+void kvm_update_apic_virt_timer(struct kvm_vcpu *vcpu)
+{
+	apic_update_apic_virt_timer(vcpu->arch.apic);
+}
+EXPORT_SYMBOL_GPL(kvm_update_apic_virt_timer);
+
 static void apic_update_lvtt(struct kvm_lapic *apic)
 {
 	u32 timer_mode = kvm_lapic_get_reg(apic, APIC_LVTT) &
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index d3fad67a4e78..3c597b670e7e 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -250,6 +250,7 @@ void kvm_lapic_switch_to_apic_virt_timer(struct kvm_vcpu *vcpu);
 void kvm_lapic_expired_hv_timer(struct kvm_vcpu *vcpu);
 bool kvm_lapic_hv_timer_in_use(struct kvm_vcpu *vcpu);
 void kvm_lapic_restart_hv_timer(struct kvm_vcpu *vcpu);
+void kvm_update_apic_virt_timer(struct kvm_vcpu *vcpu);
 
 static inline bool kvm_lapic_apic_virt_timer_in_use(struct kvm_vcpu *vcpu)
 {
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index dcb04fc0b8a7..82e1a0b2a8d2 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4563,6 +4563,8 @@ void vmx_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
 						 kvm_vcpu_apicv_active(vcpu));
 
 	vmx_update_msr_bitmap_x2apic(vcpu);
+
+	kvm_update_apic_virt_timer(vcpu);
 }
 
 static u32 vmx_exec_control(struct vcpu_vmx *vmx)
-- 
2.45.2