[PATCH v5 5/5] KVM : VMX: Use posted interrupt to deliver virtual interrupt

[Yang Zhang]

From: Yang Zhang <yang.z.zh...@intel.com>

If posted interrupt is avaliable, then uses it to inject virtual
interrupt to guest.

Signed-off-by: Yang Zhang <yang.z.zh...@intel.com>
---
 arch/x86/kvm/irq.c   |    2 +-
 arch/x86/kvm/lapic.c |   16 +++++++++++++---
 arch/x86/kvm/lapic.h |    1 +
 arch/x86/kvm/x86.c   |    4 ++++
 4 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c
index 484bc87..93b1fd0 100644
--- a/arch/x86/kvm/irq.c
+++ b/arch/x86/kvm/irq.c
@@ -81,7 +81,7 @@ int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
        if (kvm_cpu_has_extint(v))
                return 1;
 
-       return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
+       return (kvm_apic_has_interrupt(v) != -1) || kvm_hwapic_has_interrupt(v);
 }
 EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
 
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index b3ea50e..76c8df4 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -713,7 +713,10 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int 
delivery_mode,
                } else
                        apic_clear_vector(vector, apic->regs + APIC_TMR);
 
-               result = !apic_test_and_set_irr(vector, apic);
+               result = 1;
+               if (!kvm_x86_ops->deliver_posted_interrupt(vcpu, vector))
+                       result = !apic_test_and_set_irr(vector, apic);
+
                trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
                                          trig_mode, vector, !result);
                if (!result) {
@@ -723,8 +726,10 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int 
delivery_mode,
                        break;
                }
 
-               kvm_make_request(KVM_REQ_EVENT, vcpu);
-               kvm_vcpu_kick(vcpu);
+               if (!kvm_x86_ops->vm_has_apicv(vcpu->kvm)) {
+                       kvm_make_request(KVM_REQ_EVENT, vcpu);
+                       kvm_vcpu_kick(vcpu);
+               }
                break;
 
        case APIC_DM_REMRD:
@@ -1604,6 +1609,11 @@ int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
        return highest_irr;
 }
 
+bool kvm_hwapic_has_interrupt(struct kvm_vcpu *vcpu)
+{
+       return kvm_x86_ops->sync_pir_to_irr(vcpu, false);
+}
+
 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
 {
        u32 lvt0 = kvm_apic_get_reg(vcpu->arch.apic, APIC_LVT0);
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index e5327be..c6abc63 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -37,6 +37,7 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu);
 void kvm_free_lapic(struct kvm_vcpu *vcpu);
 
 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu);
+bool kvm_hwapic_has_interrupt(struct kvm_vcpu *vcpu);
 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu);
 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu);
 void kvm_lapic_reset(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0baa90d..57f8570 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2679,6 +2679,7 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
                                    struct kvm_lapic_state *s)
 {
+       kvm_x86_ops->sync_pir_to_irr(vcpu, true);
        memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
 
        return 0;
@@ -5699,6 +5700,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
        }
 
        if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
+               kvm_x86_ops->sync_pir_to_irr(vcpu, true);
                inject_pending_event(vcpu);
 
                /* enable NMI/IRQ window open exits if needed */
@@ -5741,6 +5743,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 
        local_irq_disable();
 
+       kvm_x86_ops->posted_intr_clear_on(vcpu);
+
        if (vcpu->mode == EXITING_GUEST_MODE || vcpu->requests
            || need_resched() || signal_pending(current)) {
                vcpu->mode = OUTSIDE_GUEST_MODE;
-- 
1.7.1

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