From: Willy Tarreau <w@1wt.eu>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andy Lutomirski <luto@amacapital.net>, X86 ML <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Borislav Petkov <bp@alien8.de>,
Thomas Gleixner <tglx@linutronix.de>,
Brian Gerst <brgerst@gmail.com>
Subject: Re: Dealing with the NMI mess
Date: Fri, 24 Jul 2015 17:26:37 +0200 [thread overview]
Message-ID: <20150724152637.GC3612@1wt.eu> (raw)
In-Reply-To: <20150724111621.34713023@gandalf.local.home>
On Fri, Jul 24, 2015 at 11:16:21AM -0400, Steven Rostedt wrote:
> On Fri, 24 Jul 2015 16:59:01 +0200
> Willy Tarreau <w@1wt.eu> wrote:
>
> > On Fri, Jul 24, 2015 at 10:31:27AM -0400, Steven Rostedt wrote:
> > > On Fri, 24 Jul 2015 15:21:28 +0200
> > > Willy Tarreau <w@1wt.eu> wrote:
> > >
> > > > My understanding is that by using RET we can't set the RF flag and #DB
> > >
> > > But the RF flag is only set for instruction (executing) breakpoints. It
> > > is not set for data (RW) ones.
> >
> > True but these also are the most complicated to deal with. The data
> > accesses can always be emulated (not what I'm suggesting here) while
> > instructions are much harder to emulate.
>
> The point is, if we trigger a #DB on an instruction breakpoint
> while !IF, then we simply disable that breakpoint and do the RET.
Yes but the breakpoint remains disabled then. Or I'm missing
something.
> What emulation is needed?
I was speaking about redoing the operation with BP disabled before
re-enabling it. But that's not the point here anyway.
Willy
next prev parent reply other threads:[~2015-07-24 15:27 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-23 20:21 Dealing with the NMI mess Andy Lutomirski
2015-07-23 20:38 ` Linus Torvalds
2015-07-23 20:49 ` Andy Lutomirski
2015-07-23 21:08 ` Linus Torvalds
2015-07-23 21:31 ` Steven Rostedt
2015-07-23 21:46 ` Willy Tarreau
2015-07-23 21:46 ` Andy Lutomirski
2015-07-23 21:50 ` Willy Tarreau
2015-07-23 21:48 ` Linus Torvalds
2015-07-23 21:50 ` Andy Lutomirski
2015-07-23 21:59 ` Linus Torvalds
2015-07-24 8:13 ` Peter Zijlstra
2015-07-24 9:02 ` Willy Tarreau
2015-07-24 11:58 ` Steven Rostedt
2015-07-24 12:43 ` Peter Zijlstra
2015-07-24 13:03 ` Steven Rostedt
2015-07-24 13:21 ` Willy Tarreau
2015-07-24 13:30 ` Peter Zijlstra
2015-07-24 13:33 ` Peter Zijlstra
2015-07-24 14:31 ` Steven Rostedt
2015-07-24 14:59 ` Willy Tarreau
2015-07-24 15:16 ` Steven Rostedt
2015-07-24 15:26 ` Willy Tarreau [this message]
2015-07-24 15:30 ` Peter Zijlstra
2015-07-24 15:33 ` Willy Tarreau
2015-07-24 18:29 ` Linus Torvalds
2015-07-24 18:41 ` Linus Torvalds
2015-07-24 19:05 ` Steven Rostedt
2015-07-24 19:55 ` Peter Zijlstra
2015-07-24 20:22 ` Linus Torvalds
2015-07-24 20:51 ` Peter Zijlstra
2015-07-24 21:07 ` Steven Rostedt
2015-07-24 21:08 ` Andy Lutomirski
2015-07-30 15:41 ` Paolo Bonzini
2015-07-30 21:22 ` Andy Lutomirski
2015-07-30 21:58 ` Brian Gerst
2015-07-30 22:59 ` Thomas Gleixner
2015-07-31 4:22 ` Borislav Petkov
2015-07-31 5:11 ` Andy Lutomirski
2015-07-31 7:51 ` Paolo Bonzini
2015-07-31 8:03 ` Borislav Petkov
2015-07-31 9:27 ` Paolo Bonzini
2015-07-31 10:25 ` Borislav Petkov
2015-07-31 10:26 ` Paolo Bonzini
2015-07-31 10:32 ` Borislav Petkov
2015-09-07 5:39 ` Maciej W. Rozycki
2015-09-07 7:42 ` Ingo Molnar
2015-09-07 8:19 ` Maciej W. Rozycki
2015-09-07 10:19 ` Paolo Bonzini
2015-09-07 17:01 ` Maciej W. Rozycki
2015-09-07 17:22 ` Andy Lutomirski
2015-09-07 19:30 ` Maciej W. Rozycki
2015-09-07 21:56 ` Andy Lutomirski
2015-09-08 16:21 ` Maciej W. Rozycki
2015-07-24 23:53 ` Linus Torvalds
2015-07-24 15:34 ` Steven Rostedt
2015-07-24 15:49 ` Willy Tarreau
2015-07-24 15:48 ` Andy Lutomirski
2015-07-24 16:02 ` Steven Rostedt
2015-07-24 16:08 ` Willy Tarreau
2015-07-24 16:31 ` Steven Rostedt
2015-07-24 16:06 ` Steven Rostedt
2015-07-24 16:25 ` Willy Tarreau
2015-07-24 17:21 ` Andy Lutomirski
2015-07-24 17:10 ` Willy Tarreau
2015-07-24 17:20 ` Andy Lutomirski
2015-07-30 15:54 ` Paolo Bonzini
2015-07-24 17:21 ` Willy Tarreau
2015-07-23 20:52 ` Willy Tarreau
2015-07-23 20:53 ` Andy Lutomirski
2015-07-23 21:07 ` Willy Tarreau
2015-07-23 21:13 ` Linus Torvalds
2015-07-23 21:18 ` Willy Tarreau
2015-07-23 21:20 ` Peter Zijlstra
2015-07-23 21:35 ` Linus Torvalds
2015-07-23 21:45 ` Andy Lutomirski
2015-07-23 21:54 ` Linus Torvalds
2015-07-23 21:59 ` Andy Lutomirski
2015-07-23 22:03 ` Linus Torvalds
2015-07-24 10:28 ` Peter Zijlstra
2015-07-24 11:06 ` Peter Zijlstra
2015-07-23 21:17 ` Peter Zijlstra
2015-07-23 21:20 ` Steven Rostedt
2015-07-23 21:46 ` Andy Lutomirski
2015-07-24 16:33 ` Raymond Jennings
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