Re: [PATCH v2 20/39] x86/bugs: Disable Retpoline when IBT

[Josh Poimboeuf]

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