linux-kernel - Re: [PATCH V2 9/9] x86/speculation: Remove all ANNOTATE_NOSPEC

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Message-ID: <20200407172739.GI20730@hirez.programming.kicks-ass.net>
Date:   Tue, 7 Apr 2020 19:27:39 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Alexandre Chartre <alexandre.chartre@...cle.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, jthierry@...hat.com,
        tglx@...utronix.de
Subject: Re: [PATCH V2 9/9] x86/speculation: Remove all
 ANNOTATE_NOSPEC_ALTERNATIVE directives

On Tue, Apr 07, 2020 at 11:28:38AM -0500, Josh Poimboeuf wrote:
> Again, we should warn on stack changes inside alternatives, and then
> look at converting RSB and retpolines to use static branches so they
> have deterministic stacks.

I don't think we need static brancher, we should just out-of-line the
whole thing.

Let me sort this CFI error Thomas is getting and then I'll attempt a
patch along the lines I outlined in earlier emails.