diff --git a/include/hw/vfio/vfio-container-base.h b/include/hw/vfio/vfio-container-base.h
index 68539e3bed..e96cda78c8 100644
--- a/include/hw/vfio/vfio-container-base.h
+++ b/include/hw/vfio/vfio-container-base.h
@@ -76,9 +76,9 @@ int vfio_container_dma_map(VFIOContainerBase *bcontainer,
 int vfio_container_dma_unmap(VFIOContainerBase *bcontainer,
                              hwaddr iova, ram_addr_t size,
                              IOMMUTLBEntry *iotlb);
-int vfio_container_add_section_window(VFIOContainerBase *bcontainer,
-                                      MemoryRegionSection *section,
-                                      Error **errp);
+bool vfio_container_add_section_window(VFIOContainerBase *bcontainer,
+                                       MemoryRegionSection *section,
+                                       Error **errp);
 void vfio_container_del_section_window(VFIOContainerBase *bcontainer,
                                        MemoryRegionSection *section);
 int vfio_container_set_dirty_page_tracking(VFIOContainerBase *bcontainer,
@@ -131,9 +131,9 @@ struct VFIOIOMMUClass {
     int (*pci_hot_reset)(VFIODevice *vbasedev, bool single);
 
     /* SPAPR specific */
-    int (*add_window)(VFIOContainerBase *bcontainer,
-                      MemoryRegionSection *section,
-                      Error **errp);
+    bool (*add_window)(VFIOContainerBase *bcontainer,
+                       MemoryRegionSection *section,
+                       Error **errp);
     void (*del_window)(VFIOContainerBase *bcontainer,
                        MemoryRegionSection *section);
     void (*release)(VFIOContainerBase *bcontainer);
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 890d30910e..9f1f2e19f7 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -585,7 +585,7 @@ static void vfio_listener_region_add(MemoryListener *listener,
         return;
     }
 
-    if (vfio_container_add_section_window(bcontainer, section, &err)) {
+    if (!vfio_container_add_section_window(bcontainer, section, &err)) {
         goto fail;
     }
 
diff --git a/hw/vfio/container-base.c b/hw/vfio/container-base.c
index 913ae49077..98d71b3144 100644
--- a/hw/vfio/container-base.c
+++ b/hw/vfio/container-base.c
@@ -31,12 +31,12 @@ int vfio_container_dma_unmap(VFIOContainerBase *bcontainer,
     return bcontainer->ops->dma_unmap(bcontainer, iova, size, iotlb);
 }
 
-int vfio_container_add_section_window(VFIOContainerBase *bcontainer,
-                                      MemoryRegionSection *section,
-                                      Error **errp)
+bool vfio_container_add_section_window(VFIOContainerBase *bcontainer,
+                                       MemoryRegionSection *section,
+                                       Error **errp)
 {
     if (!bcontainer->ops->add_window) {
-        return 0;
+        return true;
     }
 
     return bcontainer->ops->add_window(bcontainer, section, errp);
diff --git a/hw/vfio/spapr.c b/hw/vfio/spapr.c
index 148b257c9c..47b040f1bc 100644
--- a/hw/vfio/spapr.c
+++ b/hw/vfio/spapr.c
@@ -323,7 +323,7 @@ static int vfio_spapr_create_window(VFIOContainer *container,
     return 0;
 }
 
-static int
+static bool
 vfio_spapr_container_add_section_window(VFIOContainerBase *bcontainer,
                                         MemoryRegionSection *section,
                                         Error **errp)
@@ -351,13 +351,13 @@ vfio_spapr_container_add_section_window(VFIOContainerBase *bcontainer,
             error_setg(errp, "Container %p can't map guest IOVA region"
                        " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, container,
                        iova, end);
-            return -EINVAL;
+            return false;
         }
-        return 0;
+        return true;
     }
 
     if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
-        return 0;
+        return true;
     }
 
     /* For now intersections are not allowed, we may relax this later */
@@ -373,14 +373,14 @@ vfio_spapr_container_add_section_window(VFIOContainerBase *bcontainer,
                 section->offset_within_address_space +
                     int128_get64(section->size) - 1,
                 hostwin->min_iova, hostwin->max_iova);
-            return -EINVAL;
+            return false;
         }
     }
 
     ret = vfio_spapr_create_window(container, section, &pgsize);
     if (ret) {
         error_setg_errno(errp, -ret, "Failed to create SPAPR window");
-        return ret;
+        return false;
     }
 
     vfio_host_win_add(scontainer, section->offset_within_address_space,
@@ -406,14 +406,14 @@ vfio_spapr_container_add_section_window(VFIOContainerBase *bcontainer,
                                      "vfio: failed GROUP_SET_SPAPR_TCE for "
                                      "KVM VFIO device %d and group fd %d",
                                      param.tablefd, param.groupfd);
-                    return -errno;
+                    return false;
                 }
                 trace_vfio_spapr_group_attach(param.groupfd, param.tablefd);
             }
         }
     }
 #endif
-    return 0;
+    return true;
 }
 
 static void
