From: Willy Tarreau <w@1wt.eu>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Peter Zijlstra <peterz@infradead.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Steven Rostedt <rostedt@goodmis.org>, 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 18:25:50 +0200 [thread overview]
Message-ID: <20150724162550.GG3612@1wt.eu> (raw)
In-Reply-To: <CALCETrWjzU79ASDK+0RJQyCy6qTdM3FPTa4ZM0d5sVW66yhcug@mail.gmail.com>
On Fri, Jul 24, 2015 at 08:48:57AM -0700, Andy Lutomirski wrote:
> So by the time we detect that we've hit a watchpoint, the instruction
> that tripped it is done and we don't need RF. Furthermore, after
> reading 17.3.1.1: I *think* that regs->flags withh have RF *clear* if
> we hit a watchpoint.
Apparently after reading 17.3.1.1, it seems like RF can still be set
if a data breakpoint triggers in a repeated string instruction before
the last iteration. However I don't think we care because as long as
we return to the string instruction, since the data location was already
visited it won't trigger again so the loss of the flag should be safe.
Willy
next prev parent reply other threads:[~2015-07-24 16:26 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
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 [this message]
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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