KVM: Unify the delivery of IOAPIC and MSI interrupts

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

2 files changed, 92 insertions, 94 deletions

diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 812801317e36..883fd0dc9b78 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -203,79 +203,56 @@ u32 kvm_ioapic_get_delivery_bitmask(struct kvm_ioapic *ioapic, u8 dest,
 
 static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
 {
-        u8 dest = ioapic->redirtbl[irq].fields.dest_id;
-        u8 dest_mode = ioapic->redirtbl[irq].fields.dest_mode;
-        u8 delivery_mode = ioapic->redirtbl[irq].fields.delivery_mode;
-        u8 vector = ioapic->redirtbl[irq].fields.vector;
-        u8 trig_mode = ioapic->redirtbl[irq].fields.trig_mode;
-        u32 deliver_bitmask;
+        union kvm_ioapic_redirect_entry entry = ioapic->redirtbl[irq];
+        unsigned long deliver_bitmask;
         struct kvm_vcpu *vcpu;
         int vcpu_id, r = -1;
 
         ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
                      "vector=%x trig_mode=%x\n",
-                     dest, dest_mode, delivery_mode, vector, trig_mode);
+                     entry.fields.dest, entry.fields.dest_mode,
+                     entry.fields.delivery_mode, entry.fields.vector,
+                     entry.fields.trig_mode);
 
-        deliver_bitmask = kvm_ioapic_get_delivery_bitmask(ioapic, dest,
-                                                          dest_mode);
+        kvm_get_intr_delivery_bitmask(ioapic, &entry, &deliver_bitmask);
         if (!deliver_bitmask) {
                 ioapic_debug("no target on destination\n");
                 return 0;
         }
 
-        switch (delivery_mode) {
-        case IOAPIC_LOWEST_PRIORITY:
-                vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm, vector,
-                                deliver_bitmask);
+        /* Always delivery PIT interrupt to vcpu 0 */
 #ifdef CONFIG_X86
-                if (irq == 0)
-                        vcpu = ioapic->kvm->vcpus[0];
+        if (irq == 0)
+                deliver_bitmask = 1;
 #endif
-                if (vcpu != NULL)
-                        r = ioapic_inj_irq(ioapic, vcpu, vector,
-                                       trig_mode, delivery_mode);
-                else
-                        ioapic_debug("null lowest prio vcpu: "
-                                     "mask=%x vector=%x delivery_mode=%x\n",
-                                     deliver_bitmask, vector, IOAPIC_LOWEST_PRIORITY);
-                break;
-        case IOAPIC_FIXED:
-#ifdef CONFIG_X86
-                if (irq == 0)
-                        deliver_bitmask = 1;
-#endif
-                for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
-                        if (!(deliver_bitmask & (1 << vcpu_id)))
-                                continue;
-                        deliver_bitmask &= ~(1 << vcpu_id);
-                        vcpu = ioapic->kvm->vcpus[vcpu_id];
-                        if (vcpu) {
+
+        for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
+                if (!(deliver_bitmask & (1 << vcpu_id)))
+                        continue;
+                deliver_bitmask &= ~(1 << vcpu_id);
+                vcpu = ioapic->kvm->vcpus[vcpu_id];
+                if (vcpu) {
+                        if (entry.fields.delivery_mode ==
+                                        IOAPIC_LOWEST_PRIORITY ||
+                            entry.fields.delivery_mode == IOAPIC_FIXED) {
                                 if (r < 0)
                                         r = 0;
-                                r += ioapic_inj_irq(ioapic, vcpu, vector,
-                                               trig_mode, delivery_mode);
-                        }
-                }
-                break;
-        case IOAPIC_NMI:
-                for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
-                        if (!(deliver_bitmask & (1 << vcpu_id)))
-                                continue;
-                        deliver_bitmask &= ~(1 << vcpu_id);
-                        vcpu = ioapic->kvm->vcpus[vcpu_id];
-                        if (vcpu) {
-                                ioapic_inj_nmi(vcpu);
+                                r += ioapic_inj_irq(ioapic, vcpu,
+                                                    entry.fields.vector,
+                                                    entry.fields.trig_mode,
+                                                    entry.fields.delivery_mode);
+                        } else if (entry.fields.delivery_mode == IOAPIC_NMI) {
                                 r = 1;
-                        }
-                        else
-                                ioapic_debug("NMI to vcpu %d failed\n",
-                                                vcpu->vcpu_id);
-                }
-                break;
-        default:
-                printk(KERN_WARNING "Unsupported delivery mode %d\n",
-                       delivery_mode);
-                break;
+                                ioapic_inj_nmi(vcpu);
+                        } else
+                                ioapic_debug("unsupported delivery mode %x!\n",
+                                             entry.fields.delivery_mode);
+                } else
+                        ioapic_debug("null destination vcpu: "
+                                     "mask=%x vector=%x delivery_mode=%x\n",
+                                     entry.fields.deliver_bitmask,
+                                     entry.fields.vector,
+                                     entry.fields.delivery_mode);
         }
         return r;
 }
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 864ac5483baa..aec7a0d93a3f 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -43,53 +43,74 @@ static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
         return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
 }
 
+void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
+                                   union kvm_ioapic_redirect_entry *entry,
+                                   unsigned long *deliver_bitmask)
+{
+        struct kvm_vcpu *vcpu;
+
+        *deliver_bitmask = kvm_ioapic_get_delivery_bitmask(ioapic,
+                                entry->fields.dest_id, entry->fields.dest_mode);
+        switch (entry->fields.delivery_mode) {
+        case IOAPIC_LOWEST_PRIORITY:
+                vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm,
+                                entry->fields.vector, *deliver_bitmask);
+                *deliver_bitmask = 1 << vcpu->vcpu_id;
+                break;
+        case IOAPIC_FIXED:
+        case IOAPIC_NMI:
+                break;
+        default:
+                if (printk_ratelimit())
+                        printk(KERN_INFO "kvm: unsupported delivery mode %d\n",
+                                entry->fields.delivery_mode);
+                *deliver_bitmask = 0;
+        }
+}
+
 static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
                        struct kvm *kvm, int level)
 {
         int vcpu_id, r = -1;
         struct kvm_vcpu *vcpu;
         struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
-        int dest_id = (e->msi.address_lo & MSI_ADDR_DEST_ID_MASK)
-                        >> MSI_ADDR_DEST_ID_SHIFT;
-        int vector = (e->msi.data & MSI_DATA_VECTOR_MASK)
-                        >> MSI_DATA_VECTOR_SHIFT;
-        int dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
-                                (unsigned long *)&e->msi.address_lo);
-        int trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
-                                (unsigned long *)&e->msi.data);
-        int delivery_mode = test_bit(MSI_DATA_DELIVERY_MODE_SHIFT,
-                                (unsigned long *)&e->msi.data);
-        u32 deliver_bitmask;
+        union kvm_ioapic_redirect_entry entry;
+        unsigned long deliver_bitmask;
 
         BUG_ON(!ioapic);
 
-        deliver_bitmask = kvm_ioapic_get_delivery_bitmask(ioapic,
-                                dest_id, dest_mode);
-        /* IOAPIC delivery mode value is the same as MSI here */
-        switch (delivery_mode) {
-        case IOAPIC_LOWEST_PRIORITY:
-                vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm, vector,
-                                deliver_bitmask);
-                if (vcpu != NULL)
-                        r = kvm_apic_set_irq(vcpu, vector, trig_mode);
-                else
-                        printk(KERN_INFO "kvm: null lowest priority vcpu!\n");
-                break;
-        case IOAPIC_FIXED:
-                for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
-                        if (!(deliver_bitmask & (1 << vcpu_id)))
-                                continue;
-                        deliver_bitmask &= ~(1 << vcpu_id);
-                        vcpu = ioapic->kvm->vcpus[vcpu_id];
-                        if (vcpu) {
-                                if (r < 0)
-                                        r = 0;
-                                r += kvm_apic_set_irq(vcpu, vector, trig_mode);
-                        }
+        entry.bits = 0;
+        entry.fields.dest_id = (e->msi.address_lo &
+                        MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
+        entry.fields.vector = (e->msi.data &
+                        MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
+        entry.fields.dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
+                        (unsigned long *)&e->msi.address_lo);
+        entry.fields.trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
+                        (unsigned long *)&e->msi.data);
+        entry.fields.delivery_mode = test_bit(
+                        MSI_DATA_DELIVERY_MODE_SHIFT,
+                        (unsigned long *)&e->msi.data);
+
+        /* TODO Deal with RH bit of MSI message address */
+
+        kvm_get_intr_delivery_bitmask(ioapic, &entry, &deliver_bitmask);
+
+        if (!deliver_bitmask) {
+                printk(KERN_WARNING "kvm: no destination for MSI delivery!");
+                return -1;
+        }
+        for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
+                if (!(deliver_bitmask & (1 << vcpu_id)))
+                        continue;
+                deliver_bitmask &= ~(1 << vcpu_id);
+                vcpu = ioapic->kvm->vcpus[vcpu_id];
+                if (vcpu) {
+                        if (r < 0)
+                                r = 0;
+                        r += kvm_apic_set_irq(vcpu, entry.fields.vector,
+                                              entry.fields.trig_mode);
                 }
-                break;
-        default:
-                break;
         }
         return r;
 }