As part of Intel’s forthcoming Flexible Return and Event Delivery (FRED) specification is the new LKGS instruction for managing the state of the GS segment register in a more flexible manner. With Linux 6.3 the kernel will allow making use of the LKGS instruction where supported on future Intel CPUs…

Source: Phoronix – Linux 6.3 To Support Making Use Of Intel’s New LKGS Instruction (Part Of FRED)