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Date:   Thu, 21 May 2020 23:34:27 +0200
From:   Thomas Gleixner <>
To:     Yu-cheng Yu <>,,
        "H. Peter Anvin" <>, Ingo Molnar <>,,,,,, Arnd Bergmann <>,
        Andy Lutomirski <>,
        Balbir Singh <>,
        Borislav Petkov <>,
        Cyrill Gorcunov <>,
        Dave Hansen <>,
        Eugene Syromiatnikov <>,
        Florian Weimer <>,
        "H.J. Lu" <>, Jann Horn <>,
        Jonathan Corbet <>,
        Kees Cook <>,
        Mike Kravetz <>,
        Nadav Amit <>,
        Oleg Nesterov <>, Pavel Machek <>,
        Peter Zijlstra <>,
        Randy Dunlap <>,
        "Ravi V. Shankar" <>,
        Vedvyas Shanbhogue <>,
        Dave Martin <>,
        Weijiang Yang <>
Cc:     Yu-cheng Yu <>
Subject: Re: [RFC PATCH 4/5] selftest/x86: Fix sysret_rip with ENDBR

Yu-cheng Yu <> writes:

> Insert endbr64 to assembly code of sysret_rip.

This changelog explains what the patch does, but not the WHY. It also
lacks any information why this is harmless for !CET enabled systems.

> Signed-off-by: Yu-cheng Yu <>
> ---

Please consult Dave Hansen about the void between your Signed-off-by
and the '---' line.



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