diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 50cdedf..9a86470 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -1117,6 +1117,15 @@ static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
 		return -EINVAL;
 	if ((vma->vm_flags & VM_SHARED) == 0)
 		return -EINVAL;
+	if (index >= VFIO_PCI_NUM_REGIONS) {
+		int regnum = index - VFIO_PCI_NUM_REGIONS;
+		struct vfio_pci_region *region = vdev->region + regnum;
+
+		if (region && region->ops && region->ops->mmap &&
+		    (region->flags & VFIO_REGION_INFO_FLAG_MMAP))
+			return region->ops->mmap(vdev, region, vma);
+		return -EINVAL;
+	}
 	if (index >= VFIO_PCI_ROM_REGION_INDEX)
 		return -EINVAL;
 	if (!vdev->bar_mmap_supported[index])
diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h
index cde3b5d..86aab05 100644
--- a/drivers/vfio/pci/vfio_pci_private.h
+++ b/drivers/vfio/pci/vfio_pci_private.h
@@ -59,6 +59,9 @@ struct vfio_pci_regops {
 		      size_t count, loff_t *ppos, bool iswrite);
 	void	(*release)(struct vfio_pci_device *vdev,
 			   struct vfio_pci_region *region);
+	int	(*mmap)(struct vfio_pci_device *vdev,
+			struct vfio_pci_region *region,
+			struct vm_area_struct *vma);
 };
 
 struct vfio_pci_region {