On 01/06/2018 06:41 AM, Konrad Rzeszutek Wilk wrote: >> .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.
