[PATCH v3 03/16] kvm: lapic: Introduce APICv update helper function

[Suthikulpanit, Suravee]

Re-factor code into a helper function for setting lapic parameters when
activate/deactivate APICv, and export the function for subsequent usage.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com>
---
 arch/x86/kvm/lapic.c | 22 +++++++++++++++++-----
 arch/x86/kvm/lapic.h |  1 +
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 685d17c..6453273 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -2147,6 +2147,21 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
                pr_warn_once("APIC base relocation is unsupported by KVM");
 }
 
+void kvm_apic_update_apicv(struct kvm_vcpu *vcpu)
+{
+       struct kvm_lapic *apic = vcpu->arch.apic;
+
+       if (vcpu->arch.apicv_active) {
+               /* irr_pending is always true when apicv is activated. */
+               apic->irr_pending = true;
+               apic->isr_count = 1;
+       } else {
+               apic->irr_pending = (apic_search_irr(apic) != -1);
+               apic->isr_count = count_vectors(apic->regs + APIC_ISR);
+       }
+}
+EXPORT_SYMBOL_GPL(kvm_apic_update_apicv);
+
 void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
 {
        struct kvm_lapic *apic = vcpu->arch.apic;
@@ -2189,8 +2204,7 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool 
init_event)
                kvm_lapic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
                kvm_lapic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
        }
-       apic->irr_pending = vcpu->arch.apicv_active;
-       apic->isr_count = vcpu->arch.apicv_active ? 1 : 0;
+       kvm_apic_update_apicv(vcpu);
        apic->highest_isr_cache = -1;
        update_divide_count(apic);
        atomic_set(&apic->lapic_timer.pending, 0);
@@ -2449,9 +2463,7 @@ int kvm_apic_set_state(struct kvm_vcpu *vcpu, struct 
kvm_lapic_state *s)
        apic_manage_nmi_watchdog(apic, kvm_lapic_get_reg(apic, APIC_LVT0));
        update_divide_count(apic);
        start_apic_timer(apic);
-       apic->irr_pending = true;
-       apic->isr_count = vcpu->arch.apicv_active ?
-                               1 : count_vectors(apic->regs + APIC_ISR);
+       kvm_apic_update_apicv(vcpu);
        apic->highest_isr_cache = -1;
        if (vcpu->arch.apicv_active) {
                kvm_x86_ops->apicv_post_state_restore(vcpu);
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index 50053d2..36a5271 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -91,6 +91,7 @@ bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct 
kvm_lapic *source,
 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
                     struct dest_map *dest_map);
 int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type);
+void kvm_apic_update_apicv(struct kvm_vcpu *vcpu);
 
 bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
                struct kvm_lapic_irq *irq, int *r, struct dest_map *dest_map);
-- 
1.8.3.1