KVM: Report IRQ injection status to userspace.

[linux-2.6-omap-h63xx.git] / virt / kvm / ioapic.c

diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 1c986ac59ad67cff1968c259fa941a25c0bd3103..c3b99def9cbc3c1eff063248a064d7ee3fc8c84e 100644 (file)
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -83,19 +83,22 @@ static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
        return result;
 }
 
-static void ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
+static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
 {
        union ioapic_redir_entry *pent;
+       int injected = -1;
 
        pent = &ioapic->redirtbl[idx];
 
        if (!pent->fields.mask) {
-               int injected = ioapic_deliver(ioapic, idx);
+               injected = ioapic_deliver(ioapic, idx);
                if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
                        pent->fields.remote_irr = 1;
        }
        if (!pent->fields.trig_mode)
                ioapic->irr &= ~(1 << idx);
+
+       return injected;
 }
 
 static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
@@ -207,7 +210,7 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
        u8 trig_mode = ioapic->redirtbl[irq].fields.trig_mode;
        u32 deliver_bitmask;
        struct kvm_vcpu *vcpu;
-       int vcpu_id, r = 0;
+       int vcpu_id, r = -1;
 
        ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
                     "vector=%x trig_mode=%x\n",
@@ -247,7 +250,9 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
                        deliver_bitmask &= ~(1 << vcpu_id);
                        vcpu = ioapic->kvm->vcpus[vcpu_id];
                        if (vcpu) {
-                               r = ioapic_inj_irq(ioapic, vcpu, vector,
+                               if (r < 0)
+                                       r = 0;
+                               r += ioapic_inj_irq(ioapic, vcpu, vector,
                                               trig_mode, delivery_mode);
                        }
                }
@@ -258,8 +263,10 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
                                continue;
                        deliver_bitmask &= ~(1 << vcpu_id);
                        vcpu = ioapic->kvm->vcpus[vcpu_id];
-                       if (vcpu)
+                       if (vcpu) {
                                ioapic_inj_nmi(vcpu);
+                               r = 1;
+                       }
                        else
                                ioapic_debug("NMI to vcpu %d failed\n",
                                                vcpu->vcpu_id);
@@ -273,11 +280,12 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
        return r;
 }
 
-void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
+int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
 {
        u32 old_irr = ioapic->irr;
        u32 mask = 1 << irq;
        union ioapic_redir_entry entry;
+       int ret = 1;
 
        if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
                entry = ioapic->redirtbl[irq];
@@ -288,9 +296,10 @@ void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
                        ioapic->irr |= mask;
                        if ((!entry.fields.trig_mode && old_irr != ioapic->irr)
                            || !entry.fields.remote_irr)
-                               ioapic_service(ioapic, irq);
+                               ret = ioapic_service(ioapic, irq);
                }
        }
+       return ret;
 }
 
 static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int pin,