A quick web search shows that a lot of everyday users are interested in turning off mitigations on their machine “to test performance” - both on Linux and Windows 10.
In the wild exploits are almost certainly hitting vulnerable machines.
In the wild exploits are almost certainly hitting vulnerable machines.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/lin...
There is no way to enable or disable this particular mitigation. That's probably because it's an extremely cheap mitigation.
Disclaimer: I work on Linux at Intel.