linux-kernel - Re: [PATCH 15/21] x86/xen/pvh: Convert indirect jump to retpoline

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Message-ID: <f7335fd4-6204-101c-c628-e5f30c9d4463@oracle.com>
Date:   Thu, 14 Jan 2021 19:33:10 -0500
From:   boris.ostrovsky@...cle.com
To:     Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        Miroslav Benes <mbenes@...e.cz>,
        Juergen Gross <jgross@...e.com>
Subject: Re: [PATCH 15/21] x86/xen/pvh: Convert indirect jump to retpoline


On 1/14/21 2:40 PM, Josh Poimboeuf wrote:
> It's kernel policy to not have (unannotated) indirect jumps because of
> Spectre v2.  This one's probably harmless, but better safe than sorry.
> Convert it to a retpoline.
>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: Juergen Gross <jgross@...e.com>
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>