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    SubjectRE: [PATCH v2 4/8] x86/spec_ctrl: Add sysctl knobs to enable/disable SPEC_CTRL feature
    Date
    > >>  .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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