Transactional Synchronization Extensions (TSX) is an extension to the x86 instruction set architecture that adds hardware transactional memory support, speeding up execution of multi-threaded software.
What exactly are you looking for?
It needs to correct working Qemu-KVM hypervisor with libvirtd.
In ARK intel specification many processors suppose to have that instruction, but thats not working with microcode.dat 2014 year old
linux-firmware package and intel-ucode consist old microcode data.