mcesa
save_gs_cb((struct gs_cb *) mcesa->guarded_storage_save_area);
struct mcesa *mcesa;
mcesa = __va(get_lowcore()->mcesad & MCESA_ORIGIN_MASK);
save_vx_regs((__vector128 *) mcesa->vector_save_area);
static struct mcesa boot_mcesa __aligned(MCESA_MAX_SIZE);