From: peterz@infradead.org
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Andy Lutomirski <luto@kernel.org>, X86 ML <x86@kernel.org>,
LKML <linux-kernel@vger.kernel.org>, Kyle Huey <me@kylehuey.com>,
Alexandre Chartre <alexandre.chartre@oracle.com>,
"Robert O'Callahan" <rocallahan@gmail.com>,
"Paul E. McKenney" <paulmck@kernel.org>,
Frederic Weisbecker <frederic@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Joel Fernandes <joel@joelfernandes.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>, Brian Gerst <brgerst@gmail.com>,
"Josh Poimboeuf" <jpoimboe@redhat.com>,
Daniel Thompson <daniel.thompson@linaro.org>
Subject: Re: [PATCH v2 5/8] x86/debug: Simplify #DB signal code
Date: Mon, 24 Aug 2020 14:00:17 +0200 [thread overview]
Message-ID: <20200824120017.GU1362448@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <b5ff8a44-1039-645c-de3e-d5f085cbc3f0@citrix.com>
On Mon, Aug 24, 2020 at 12:26:01PM +0100, Andrew Cooper wrote:
> > INT1 is a trap,
> > instruction breakpoint is a fault
> >
> > So if you have:
> >
> > INT1
> > 1: some-instr
> >
> > and set an X breakpoint on 1, we'll loose the INT1, right?
>
> You should get two. First with a dr6 of 0 (ICEBP, RIP pointing at 1:),
> and a second with dr6 indicating the X breakpoint (again, RIP pointing
> at 1:).
>
> SDM Vol3 6.9 PRIORITY AMONG SIMULTANEOUS EXCEPTIONS AND INTERRUPTS
Ooh, shiny. Clearly I didn't read enough SDM this morning.
next prev parent reply other threads:[~2020-08-24 12:00 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-21 9:39 [PATCH v2 0/8] x86/debug: Untangle handle_debug() Peter Zijlstra
2020-08-21 9:39 ` [PATCH v2 1/8] x86/debug: Allow a single level of #DB recursion Peter Zijlstra
2020-08-21 9:39 ` [PATCH v2 2/8] x86/debug: Sync BTF earlier Peter Zijlstra
2020-08-23 23:03 ` Andy Lutomirski
2020-08-21 9:39 ` [PATCH v2 3/8] x86/debug: Move kprobe_debug_handler() into exc_debug_kernel() Peter Zijlstra
2020-08-23 23:01 ` Andy Lutomirski
2020-08-21 9:39 ` [PATCH v2 4/8] x86/debug: Remove handle_debug(.user) argument Peter Zijlstra
2020-08-23 23:05 ` Andy Lutomirski
2020-08-21 9:39 ` [PATCH v2 5/8] x86/debug: Simplify #DB signal code Peter Zijlstra
2020-08-23 23:09 ` Andy Lutomirski
2020-08-24 11:05 ` peterz
2020-08-24 11:26 ` Andrew Cooper
2020-08-24 12:00 ` peterz [this message]
2020-08-24 23:07 ` Andy Lutomirski
2020-08-24 23:09 ` Andy Lutomirski
2020-08-21 9:39 ` [PATCH v2 6/8] x86/debug: Move historical SYSENTER junk into exc_debug_kernel() Peter Zijlstra
2020-08-21 9:39 ` [PATCH v2 7/8] x86/debug: Move cond_local_irq_enable() block into exc_debug_user() Peter Zijlstra
2020-08-21 9:39 ` [PATCH v2 8/8] x86/debug: Remove the historical junk Peter Zijlstra
2020-08-21 12:22 ` [PATCH v2.1 " peterz
2020-08-23 23:11 ` [PATCH v2 " Andy Lutomirski
2020-08-21 12:56 ` [PATCH v2 0/8] x86/debug: Untangle handle_debug() peterz
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