[Qemu-devel] [PATCH 2/6] pci-assign: Add support for no-route

[Alex Williamson <alex.williamson@redhat.com>]

In the event that a pci-assign device is added to a chipset that
hasn't yet implemented the INTx routing interface, exit gracefully
instead of killing the VM.  I'm sure we'll implement this for q35,
but there's no reason for such a harsh response.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---

 hw/kvm/pci-assign.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/kvm/pci-assign.c b/hw/kvm/pci-assign.c
index 05b93d9..7ce0f37 100644
--- a/hw/kvm/pci-assign.c
+++ b/hw/kvm/pci-assign.c
@@ -887,6 +887,12 @@ static int assign_intx(AssignedDevice *dev)
 
     intx_route = pci_device_route_intx_to_irq(&dev->dev, dev->intpin);
     assert(intx_route.mode != PCI_INTX_INVERTED);
+    if (intx_route.mode == PCI_INTX_NOROUTE) {
+        error_report("pci-assign: chipset provides no INTx routing "
+                     "information, but device supports INTx interrupt mode.\n");
+        pci_device_set_intx_routing_notifier(&dev->dev, NULL);
+        return -ENOTSUP;
+    }
 
     if (dev->intx_route.mode == intx_route.mode &&
         dev->intx_route.irq == intx_route.irq) {