Messages in this thread | | | From | "Van De Ven, Arjan" <> | Subject | RE: [PATCH v2 4/8] x86/spec_ctrl: Add sysctl knobs to enable/disable SPEC_CTRL feature | Date | Sat, 6 Jan 2018 17:41:44 +0000 |
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> >> .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
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