Messages in this thread | | | Date | Thu, 24 Feb 2022 18:22:05 -0800 | From | Josh Poimboeuf <> | Subject | Re: [PATCH v2 20/39] x86/bugs: Disable Retpoline when IBT |
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On Thu, Feb 24, 2022 at 05:11:23PM -0800, Kees Cook wrote: > On Thu, Feb 24, 2022 at 03:51:58PM +0100, Peter Zijlstra wrote: > > Retpoline and IBT are mutually exclusive. IBT relies on indirect > > branches (JMP/CALL *%reg) while retpoline avoids them by design. > > > > Demote to LFENCE on IBT enabled hardware. > > What's the expected perf impact of this?
Should make it faster...
-- Josh
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