linux-kernel - Re: [PATCH 03/24] x86/paravirt: Annotate indirect calls

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Date:   Fri, 26 Jan 2018 09:57:10 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Juergen Gross <jgross@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        linux-kernel@...r.kernel.org, Dave Hansen <dave.hansen@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Jason Baron <jbaron@...mai.com>
Subject: Re: [PATCH 03/24] x86/paravirt: Annotate indirect calls

On Thu, 2018-01-25 at 12:35 +0100, Peter Zijlstra wrote:
> On Thu, Jan 25, 2018 at 10:52:53AM +0000, David Woodhouse wrote:
> > 
> > OK, my brain hurts a bit but I'm happy now. Thank you.
> OK, I've updated the Changelog thusly. Is this satisfactory?
> 
> ---
> Subject: x86/paravirt: Annotate indirect calls
> From: Peter Zijlstra <peterz@...radead.org>
> Date: Wed Jan 17 16:58:11 CET 2018
> 
> Paravirt emits indirect calls which get flagged by objtool retpoline
> checks, annotate it away because all these indirect calls will be
> patched out before we start userspace.
> 
> This patching happens through alternative_instructions() ->
> apply_paravirt() -> pv_init_ops.patch() which will eventually end up
> in paravirt_patch_default(). This function _will_ write direct
> alternatives.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Reviewed-by: David Woodhouse <dwmw@...zon.co.uk>

I love you, Peter.
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