instead of downgrading microcode i did eventually enabled the needed CPU flag:
#> grubby --update-kernel=ALL --args="tsx=on"
#> grub2-mkconfig -o /etc/grub2.cfg
#> reboot
Reverse changes after change the default CPU type of the cluster:
set host in maintenance
#> grubby --update-kernel=ALL --remove-args="tsx=on"
#> grub2-mkconfig -o /etc/grub2.cfg
#> reboot