IXGBE_VT_CTL
IXGBE_WRITE_REG(hw, IXGBE_VT_CTL, 0);
IXGBE_WRITE_REG(hw, IXGBE_VT_CTL, vt_ctl);
if (!(IXGBE_READ_REG(hw, IXGBE_VT_CTL) & IXGBE_VT_CTL_VT_ENABLE))