While there are ways to disable mitigation against many of the side-channel issues, this is not one of them. I believe this one is mitigated by the "sbb;and" s

While there are ways to disable mitigation against many of the side-channel issues, this is not one of them. I believe this one is mitigated by the "sbb;and" sequence here: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/lib/getuser.S?id=c7f631cb07e7da06ac1d231ca178452339e32a94#n43 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.