diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 62af1216fc..4fca4c6166 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -555,6 +555,18 @@ static bool vfio_get_section_iova_range(VFIOContainerBase *bcontainer,
     return true;
 }
 
+static void vfio_device_error_append(VFIODevice *vbasedev, Error **errp)
+{
+    /*
+     * MMIO region mapping failures are not fatal but in this case PCI
+     * peer-to-peer transactions are broken.
+     */
+    if (vbasedev && vbasedev->type == VFIO_DEVICE_TYPE_PCI) {
+        error_append_hint(errp, "%s: PCI peer-to-peer transactions "
+                          "on BARs are not supported.\n", vbasedev->name);
+    }
+}
+
 static void vfio_listener_region_add(MemoryListener *listener,
                                      MemoryRegionSection *section)
 {
@@ -670,7 +682,10 @@ static void vfio_listener_region_add(MemoryListener *listener,
                    strerror(-ret));
         if (memory_region_is_ram_device(section->mr)) {
             /* Allow unexpected mappings not to be fatal for RAM devices */
-            error_report_err(err);
+            VFIODevice *vbasedev =
+                vfio_get_vfio_device(memory_region_owner(section->mr));
+            vfio_device_error_append(vbasedev, &err);
+            warn_report_err_once(err);
             return;
         }
         goto fail;