linux-kernel - Re: [patch V4 part 3 01/29] x86/traps: Mark fixup_bad

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Message-ID: <CALCETrW1pZ0NiN3F4g3=S+KpM79T9PbaYVC3Zr5p6P2rvk4v0A@mail.gmail.com>
Date:   Fri, 8 May 2020 17:39:00 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Brian Gerst <brgerst@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Will Deacon <will@...nel.org>
Subject: Re: [patch V4 part 3 01/29] x86/traps: Mark fixup_bad_iret() noinstr

On Tue, May 5, 2020 at 7:15 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> This is called from deep entry ASM in a situation where instrumentation
> will cause more harm than providing useful information.
>

Acked-by: Andy Lutomirski <luto@...nel.org>

Maybe add to changelog:

Switch from memmove() to memcpy() because memmove() can't be called
from noinstr code.