> >> .macro DISABLE_IBRS > >> - ALTERNATIVE "jmp .Lskip_\@", "", X86_FEATURE_SPEC_CTRL > >> + testl $1, dynamic_ibrs > > On every system call we end up hammering on this 'dynamic_ibrs' > > variable. And it looks like it can be flipped via the IPI mechanism. > > > > Would it make sense for this to be per-cpu? > > It's probably better to either just make it __read_mostly or get the > static branches that folks were suggesting actually working.
I still wonder if this isn't just better as a boot command line
