1 files changed, 71 insertions, 7 deletions

diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 7aa5086c8622..6bc7439eff6e 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -20,6 +20,11 @@
  */
 
 #include <linux/kvm_host.h>
+
+#ifdef CONFIG_X86
+#include <asm/msidef.h>
+#endif
+
 #include "irq.h"
 
 #include "ioapic.h"
@@ -38,17 +43,70 @@ static void kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
         kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
 }
 
+static void kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
+                        struct kvm *kvm, int level)
+{
+        int vcpu_id;
+        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;
+
+        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)
+                        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)
+                                kvm_apic_set_irq(vcpu, vector, trig_mode);
+                }
+                break;
+        default:
+                break;
+        }
+}
+
 /* This should be called with the kvm->lock mutex held */
 void kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
 {
         struct kvm_kernel_irq_routing_entry *e;
-        unsigned long *irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
+        unsigned long *irq_state, sig_level;
+
+        if (irq < KVM_IOAPIC_NUM_PINS) {
+                irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
 
-        /* Logical OR for level trig interrupt */
-        if (level)
-                set_bit(irq_source_id, irq_state);
-        else
-                clear_bit(irq_source_id, irq_state);
+                /* Logical OR for level trig interrupt */
+                if (level)
+                        set_bit(irq_source_id, irq_state);
+                else
+                        clear_bit(irq_source_id, irq_state);
+                sig_level = !!(*irq_state);
+        } else /* Deal with MSI/MSI-X */
+                sig_level = 1;
 
         /* Not possible to detect if the guest uses the PIC or the
          * IOAPIC.  So set the bit in both. The guest will ignore
@@ -56,7 +114,7 @@ void kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
          */
         list_for_each_entry(e, &kvm->irq_routing, link)
                 if (e->gsi == irq)
-                        e->set(e, kvm, !!(*irq_state));
+                        e->set(e, kvm, sig_level);
 }
 
 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
@@ -186,6 +244,12 @@ int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
                 e->irqchip.irqchip = ue->u.irqchip.irqchip;
                 e->irqchip.pin = ue->u.irqchip.pin + delta;
                 break;
+        case KVM_IRQ_ROUTING_MSI:
+                e->set = kvm_set_msi;
+                e->msi.address_lo = ue->u.msi.address_lo;
+                e->msi.address_hi = ue->u.msi.address_hi;
+                e->msi.data = ue->u.msi.data;
+                break;
         default:
                 goto out;
         }