static MemoryRegion *memory_region_get_flatview_root(MemoryRegion *mr)
{
    while (mr->enabled) {
        if (!mr->terminates) {
            unsigned int found = 0;
            MemoryRegion *child, *next = NULL;
            QTAILQ_FOREACH(child, &mr->subregions, subregions_link) {
                if (child->enabled) {
                    if (++found > 1) {
                        next = NULL;
                        break;
                    }
                    if (!child->addr && int128_ge(mr->size, child->size)) {
                        /* A child is included in its entirety.  If it's the only
                         * enabled one, use it in the hope of finding an alias down the
                         * way. This will also let us share FlatViews.
                         */
                        next = child;
                    }
                }
            }
            if (found == 0) {
                return NULL;
            }
            if (next) {
                mr = next;
                continue;
            }
        }

        return mr;
    }

    return NULL;
}