Re: [PATCH v8 03/12] x86/retpoline: Add initial retpoline support

[Josh Poimboeuf]

On Sun, Jan 14, 2018 at 04:02:19PM +0100, Borislav Petkov wrote:
> 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?

Yeah, that idea came after this patch was already written.  I haven't
implemented it yet.

-- 
Josh