The current Meltdown Intel processor vulnerability is currently remedied by having the page table isolation enabled. There is a question how to turn this off: How to disable Page Table Isolation to regain performance lost due to Intel CPU security hole patch?
My question is opposite: is there a way to check on a running system whether the PTI mechanism is effective on the system and thus the system is protected? I'm specifically looking for
cat /proc/something or
cat /sys/something, not checking for kernel version or config parameter or the like.