diff --git a/src/vlib/linux/pci.c b/src/vlib/linux/pci.c
index a010e64..6078be2 100644
--- a/src/vlib/linux/pci.c
+++ b/src/vlib/linux/pci.c
@@ -912,6 +912,17 @@
 			VFIO_IRQ_SET_ACTION_TRIGGER, fds);
 }
 
+uword
+vlib_pci_get_msix_file_index (vlib_main_t * vm, vlib_pci_dev_handle_t h,
+			      u16 index)
+{
+  linux_pci_device_t *p = linux_pci_get_device (h);
+  linux_pci_irq_t *irq = vec_elt_at_index (p->msix_irqs, index);
+  if (irq->fd == -1)
+    return ~0;
+  return irq->clib_file_index;
+}
+
 clib_error_t *
 vlib_pci_disable_msix_irq (vlib_main_t * vm, vlib_pci_dev_handle_t h,
 			   u16 start, u16 count)
diff --git a/src/vlib/pci/pci.h b/src/vlib/pci/pci.h
index d3b43ba..5aae597 100644
--- a/src/vlib/pci/pci.h
+++ b/src/vlib/pci/pci.h
@@ -316,6 +316,8 @@
 					 u16 count);
 clib_error_t *vlib_pci_map_dma (vlib_main_t * vm, vlib_pci_dev_handle_t h,
 				void *ptr);
+uword vlib_pci_get_msix_file_index (vlib_main_t * vm, vlib_pci_dev_handle_t h,
+				    u16 index);
 
 int vlib_pci_supports_virtual_addr_dma (vlib_main_t * vm,
 					vlib_pci_dev_handle_t h);