linux-kernel - Re: [PATCH v2 00/39] x86: Kernel IBT

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Message-ID: <Yh9E33Eijbio40QP@hirez.programming.kicks-ass.net>
Date:   Wed, 2 Mar 2022 11:20:15 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     x86@...nel.org, joao@...rdrivepizza.com, hjl.tools@...il.com,
        andrew.cooper3@...rix.com, linux-kernel@...r.kernel.org,
        ndesaulniers@...gle.com, keescook@...omium.org,
        samitolvanen@...gle.com, mark.rutland@....com,
        alyssa.milburn@...el.com, mbenes@...e.cz, rostedt@...dmis.org,
        mhiramat@...nel.org, alexei.starovoitov@...il.com
Subject: Re: [PATCH v2 00/39] x86: Kernel IBT

On Tue, Mar 01, 2022 at 03:10:22PM -0800, Josh Poimboeuf wrote:
> On Fri, Feb 25, 2022 at 04:28:32PM +0100, Peter Zijlstra wrote:
> > @@ -636,7 +649,10 @@ static __always_inline void setup_cet(st
> >  	if (!ibt_selftest()) {
> >  		pr_err("IBT selftest: Failed!\n");
> >  		setup_clear_cpu_cap(X86_FEATURE_IBT);
> > +		return;
> >  	}
> > +
> > +	pr_info("CET detected: Indirect Branch Tracking enabled\n");
> 
> This is a little excessive on my 192 CPUs :-)
> 
> It also messes with the pr_cont()s in announce_cpu():

Hehe, I just noticed the same when looking at logs trying to figure out
if kexec worked. I'll go fix.