linux-kernel - Re: [patch V4 part 4 19/24] x86/entry: Implement user mode C entry points for #DB and #MCE

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Message-ID: <CALCETrU90=dYEzXNoYPcbYAgyBgNy0gudR_6yCfk-R3-1HK5jA@mail.gmail.com>
Date:   Thu, 14 May 2020 22:32:00 -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 4 19/24] x86/entry: Implement user mode C entry
 points for #DB and #MCE

On Tue, May 5, 2020 at 7:16 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> The MCE entry point uses the same mechanism as the IST entry point for
> now. For #DB split the inner workings and just keep the ist_enter/exit
> magic in the IST variant. Fixup the ASM code to emit the proper
> noist_##cfunc call.
>


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