hw/cxl-host: Add an index field to CXLFixedMemoryWindow

To enable these to be found in a fixed order, that order needs to be known.
This will later be used to sort a list of these structures so that address
map and ACPI table entries are predictable.

Tested-by: Li Zhijian <lizhijian@fujitsu.com>
Reviewed-by: Li Zhijian <lizhijian@fujitsu.com>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Tested-by: Itaru Kitayama <itaru.kitayama@fujitsu.com>
Message-id: 20250703104110.992379-2-Jonathan.Cameron@huawei.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/cxl/cxl-host.c

@@ -24,13 +24,15 @@
 
 static void cxl_fixed_memory_window_config(CXLState *cxl_state,
                                            CXLFixedMemoryWindowOptions *object,
-                                           Error **errp)
+                                           int index, Error **errp)
 {
     ERRP_GUARD();
     g_autofree CXLFixedWindow *fw = g_malloc0(sizeof(*fw));
     strList *target;
     int i;
 
+    fw->index = index;
+
     for (target = object->targets; target; target = target->next) {
         fw->num_targets++;
     }
@@ -325,14 +327,15 @@ static void machine_set_cfmw(Object *obj, Visitor *v, const char *name,
     CXLState *state = opaque;
     CXLFixedMemoryWindowOptionsList *cfmw_list = NULL;
     CXLFixedMemoryWindowOptionsList *it;
+    int index;
 
     visit_type_CXLFixedMemoryWindowOptionsList(v, name, &cfmw_list, errp);
     if (!cfmw_list) {
         return;
     }
 
-    for (it = cfmw_list; it; it = it->next) {
-        cxl_fixed_memory_window_config(state, it->value, errp);
+    for (it = cfmw_list, index = 0; it; it = it->next, index++) {
+        cxl_fixed_memory_window_config(state, it->value, index, errp);
     }
     state->cfmw_list = cfmw_list;
 }

include/hw/cxl/cxl.h

@@ -27,6 +27,7 @@
 typedef struct PXBCXLDev PXBCXLDev;
 
 typedef struct CXLFixedWindow {
+    int index;
     uint64_t size;
     char **targets;
     PXBCXLDev *target_hbs[16];