[PATCH v7 7/7] 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/lapic.c |   29 ++++++++++++++++++-----------
 arch/x86/kvm/vmx.c   |    2 +-
 arch/x86/kvm/x86.c   |    1 +
 3 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 95e8f4a..e4af41b 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -345,6 +345,7 @@ 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);
 
@@ -669,18 +670,24 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int 
delivery_mode,
                if (unlikely(!apic_enabled(apic)))
                        break;
 
-               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);
+
+                       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;
+                       }
 
-               kvm_make_request(KVM_REQ_EVENT, vcpu);
-               kvm_vcpu_kick(vcpu);
+                       kvm_make_request(KVM_REQ_EVENT, vcpu);
+                       kvm_vcpu_kick(vcpu);
+               }
                break;
 
        case APIC_DM_REMRD:
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 690734c..a1d8ffa 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 6ad7760..e794051 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2685,6 +2685,7 @@ 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;
-- 
1.7.1

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