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Date:   Sun, 23 Aug 2020 16:11:18 -0700
From:   Andy Lutomirski <>
To:     Peter Zijlstra <>
Cc:     X86 ML <>, LKML <>,
        Kyle Huey <>,
        Alexandre Chartre <>,
        "Robert O'Callahan" <>,
        "Paul E. McKenney" <>,
        Frederic Weisbecker <>,
        Paolo Bonzini <>,
        Sean Christopherson <>,
        Masami Hiramatsu <>,
        Petr Mladek <>,
        Steven Rostedt <>,
        Joel Fernandes <>,
        Boris Ostrovsky <>,
        Juergen Gross <>,
        Brian Gerst <>,
        Andy Lutomirski <>,
        Josh Poimboeuf <>,
        Daniel Thompson <>
Subject: Re: [PATCH v2 8/8] x86/debug: Remove the historical junk

On Fri, Aug 21, 2020 at 3:21 AM Peter Zijlstra <> wrote:
> Remove the historical junk and replace it with a WARN and a comment.
> The problem is that even though the kernel only uses TF single-step in
> kprobes and KGDB, both of which consume the event before this,
> QEMU/KVM has bugs in this area that can trigger this state so we have
> to deal with it.

Almost acked by me.

If you make the change I suggested earlier, then the ->debugreg6
garbage can actually die.


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