Somewhere along the line, the nested kvm kernel module became enabled by default. As hard as it may be to believe in this day and age, not everyone in the world had a need to run kvms on every host that gets built. Is there any performance cost to leaving this default enabled even if you have zero intention to deploy kvms? All my googling on this subject has come up with no useful info on pros/cons to having this module present - performance, security, or any other potential impact.
Or, is this just case of "if it ain't broke, don't fix it"?