[PATCH v2 07/36] KVM: VMX: Update APIC timer virtualization on apicv changed

[isaku . yamahata]

From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>

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@xxxxxxxxx>
--
Changes v1 -> v2:
- Use EXPORT_SYMBOL_FOR_KVM_INTERNAL() instead of EXPORT_SYMBOL_GPL().
- Add in-kernel apic check.

Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
---
 arch/x86/kvm/lapic.c   | 9 +++++++++
 arch/x86/kvm/lapic.h   | 1 +
 arch/x86/kvm/vmx/vmx.c | 2 ++
 3 files changed, 12 insertions(+)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index abbd51c4da7f..a3c1a81e63e2 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1946,6 +1946,15 @@ 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)
+{
+	if (!lapic_in_kernel(vcpu))
+		return;
+
+	apic_update_apic_virt_timer(vcpu->arch.apic);
+}
+EXPORT_SYMBOL_FOR_KVM_INTERNAL(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 2f510503f5b3..0571b7438328 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -259,6 +259,7 @@ 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 b70641bfecab..5d36f2b632e9 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4591,6 +4591,8 @@ 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