hash_add
hash_add(sync->fences, &e->node, f->context);
hash_add(gvt->cmd_table, &e->hlist, e->info->opcode);
hash_add(gvt->mmio.mmio_info_table, &info->node, info->offset);
hash_add(info->ptable, &p->hnode, gfn);
hash_add(engine->cmd_hash, &desc_node->node,