KVM: VMX: Use posted interrupt to deliver virtual interrupt

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

Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com>
Reviewed-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

3 files changed, 21 insertions, 12 deletions

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index dbf74c922aa1..e29883c604ff 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -353,6 +353,7 @@ static inline int apic_find_highest_irr(struct kvm_lapic *apic)
         if (!apic->irr_pending)
                 return -1;
 
+        kvm_x86_ops->sync_pir_to_irr(apic->vcpu);
         result = apic_search_irr(apic);
         ASSERT(result == -1 || result >= 16);
 
@@ -683,18 +684,25 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
                 if (dest_map)
                         __set_bit(vcpu->vcpu_id, dest_map);
 
-                result = !apic_test_and_set_irr(vector, apic);
-                trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
-                                          trig_mode, vector, !result);
-                if (!result) {
-                        if (trig_mode)
-                                apic_debug("level trig mode repeatedly for "
-                                                "vector %d", vector);
-                        break;
-                }
+                if (kvm_x86_ops->deliver_posted_interrupt) {
+                        result = 1;
+                        kvm_x86_ops->deliver_posted_interrupt(vcpu, vector);
+                } else {
+                        result = !apic_test_and_set_irr(vector, apic);
 
-                kvm_make_request(KVM_REQ_EVENT, vcpu);
-                kvm_vcpu_kick(vcpu);
+                        if (!result) {
+                                if (trig_mode)
+                                        apic_debug("level trig mode repeatedly "
+                                                "for vector %d", vector);
+                                goto out;
+                        }
+
+                        kvm_make_request(KVM_REQ_EVENT, vcpu);
+                        kvm_vcpu_kick(vcpu);
+                }
+out:
+                trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
+                                trig_mode, vector, !result);
                 break;
 
         case APIC_DM_REMRD:
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 3a14d8a0ee46..5a87a58af49d 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -84,7 +84,7 @@ module_param(vmm_exclusive, bool, S_IRUGO);
 static bool __read_mostly fasteoi = 1;
 module_param(fasteoi, bool, S_IRUGO);
 
-static bool __read_mostly enable_apicv;
+static bool __read_mostly enable_apicv = 1;
 module_param(enable_apicv, bool, S_IRUGO);
 
 /*
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 276b4a9a5605..50e2e10b8041 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2692,6 +2692,7 @@ 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);
         memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
 
         return 0;