Date: Sun, 14 Jan 2018 16:02:19 +0100
From: Borislav Petkov <bp@alien8.de>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: David Woodhouse <dwmw@amazon.co.uk>,
        Andi Kleen <ak@linux.intel.com>, Paul Turner <pjt@google.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Greg Kroah-Hartman <gregkh@linux-foundation.org>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Dave Hansen <dave.hansen@intel.com>, tglx@linutronix.de,
        Kees Cook <keescook@google.com>,
        Rik van Riel <riel@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Andy Lutomirski <luto@amacapital.net>,
        Jiri Kosina <jikos@kernel.org>, gnomes@lxorguk.ukuu.org.uk,
        x86@kernel.org, thomas.lendacky@amd.com
Subject: Re: [PATCH v8 03/12] x86/retpoline: Add initial retpoline support
Message-ID: <20180114150219.olnya5vlgjbmbcbr@pd.tnic>
References: <1515707194-20531-1-git-send-email-dwmw@amazon.co.uk>
 <1515707194-20531-4-git-send-email-dwmw@amazon.co.uk>
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On Thu, Jan 11, 2018 at 09:46:25PM +0000, David Woodhouse wrote:
> +/*
> + * This should be used immediately before a retpoline alternative.  It tells
> + * objtool where the retpolines are so that it can make sense of the control
> + * flow by just reading the original instruction(s) and ignoring the
> + * alternatives.
> + */
> +.macro ANNOTATE_NOSPEC_ALTERNATIVE
> +	.Lannotate_\@:
> +	.pushsection .discard.nospec
> +	.long .Lannotate_\@ - .
> +	.popsection
> +.endm

Hey Josh, what happened to parsing only the retpoline-related
.altinstructions sections with the X86_FEATURE bits? Or is this
annotation used for something more additionally?

Thx.

-- 
Regards/Gruss,
    Boris.

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