PRED_CMD_SBPB
else if (c->x86 >= 0x19 && !wrmsrq_safe(MSR_IA32_PRED_CMD, PRED_CMD_SBPB)) {
x86_pred_cmd = PRED_CMD_SBPB;
u64 reserved_bits = ~(PRED_CMD_IBPB | PRED_CMD_SBPB);
reserved_bits |= PRED_CMD_SBPB;
reserved_bits |= PRED_CMD_SBPB;