From: Borislav Petkov <bp@amd64.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Jason Baron <jbaron@redhat.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
"H. Peter Anvin" <hpa@linux.intel.com>,
Paul Turner <pjt@google.com>, Borislav Petkov <bp@amd64.org>
Subject: Re: [RFC][PATCH 3/3] x86: Add workaround to NMI iret woes
Date: Fri, 9 Dec 2011 18:49:11 +0100 [thread overview]
Message-ID: <20111209174911.GD14900@aftab> (raw)
In-Reply-To: <1323451171.1937.33.camel@frodo>
Hey Steve,
On Fri, Dec 09, 2011 at 12:19:31PM -0500, Steven Rostedt wrote:
> Could you shed some light on this. Can an NMI interrupt an MCE in
> progress?
Easy, http://support.amd.com/us/Processor_TechDocs/APM_V2_24593.pdf,
section 8.5.
On amd64 #MC is along with processor reset the highest prio. Judging
from the text, an NMI occurring during an #MC is held until we return
from the #MC handler:
"When simultaneous interrupts occur, the processor transfers control
to the highest-priority interrupt handler. Lower-priority interrupts
from external sources are held pending by the processor, and they are
handled after the higher-priority interrupt is handled. Lower-priority
interrupts that result from internal sources are discarded. Those
interrupts reoccur when the high-priority interrupt handler completes
and transfers control back to the interrupted instruction."
HTH.
--
Regards/Gruss,
Boris.
Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
GM: Alberto Bozzo
Reg: Dornach, Landkreis Muenchen
HRB Nr. 43632 WEEE Registernr: 129 19551
next prev parent reply other threads:[~2011-12-09 17:49 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-08 19:30 [RFC][PATCH 0/3] x86: Find a way to allow breakpoints in NMIs Steven Rostedt
2011-12-08 19:30 ` [RFC][PATCH 1/3] x86: Do not schedule while still in NMI context Steven Rostedt
2011-12-08 19:30 ` [RFC][PATCH 2/3] x86: Document the NMI handler about not using paranoid_exit Steven Rostedt
2011-12-08 19:30 ` [RFC][PATCH 3/3] x86: Add workaround to NMI iret woes Steven Rostedt
2011-12-08 19:36 ` Steven Rostedt
2011-12-09 2:43 ` Steven Rostedt
2011-12-09 9:22 ` Peter Zijlstra
2011-12-09 15:00 ` Steven Rostedt
2011-12-09 15:10 ` Peter Zijlstra
2011-12-09 15:25 ` Steven Rostedt
2011-12-09 15:20 ` Steven Rostedt
2011-12-09 16:34 ` Steven Rostedt
2011-12-09 17:19 ` Steven Rostedt
2011-12-09 17:49 ` Borislav Petkov [this message]
2011-12-09 18:20 ` Steven Rostedt
2011-12-09 16:49 ` Jason Baron
2011-12-09 17:14 ` Steven Rostedt
2011-12-09 12:40 ` Mathieu Desnoyers
2011-12-09 13:02 ` Mathieu Desnoyers
2011-12-09 14:49 ` Steven Rostedt
2011-12-09 15:02 ` Mathieu Desnoyers
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