KVM: fix ack not being delivered when msi present

kvm_notify_acked_irq does not check irq type, so that it sometimes
interprets msi vector as irq.  As a result, ack notifiers are not
called, which typially hangs the guest.  The fix is to track and
check irq type.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

2 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 16713dc672e4..3060bdc35ffe 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -110,6 +110,7 @@ struct kvm_memory_slot {
 
 struct kvm_kernel_irq_routing_entry {
         u32 gsi;
+        u32 type;
         int (*set)(struct kvm_kernel_irq_routing_entry *e,
                     struct kvm *kvm, int level);
         union {
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index a8bd466d00cc..ddc17f0e2f35 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -160,7 +160,8 @@ void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
         unsigned gsi = pin;
 
         list_for_each_entry(e, &kvm->irq_routing, link)
-                if (e->irqchip.irqchip == irqchip &&
+                if (e->type == KVM_IRQ_ROUTING_IRQCHIP &&
+                    e->irqchip.irqchip == irqchip &&
                     e->irqchip.pin == pin) {
                         gsi = e->gsi;
                         break;
@@ -259,6 +260,7 @@ static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
         int delta;
 
         e->gsi = ue->gsi;
+        e->type = ue->type;
         switch (ue->type) {
         case KVM_IRQ_ROUTING_IRQCHIP:
                 delta = 0;