linux-kernel - Re: [PATCH -tip/master] perf, x86: P4 PMU - Fix unflagged overflows handling v4

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20110107191052.GB26503@redhat.com>
Date:	Fri, 7 Jan 2011 14:10:52 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Jason Wessel <jason.wessel@...driver.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Stephane Eranian <eranian@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip/master] perf, x86: P4 PMU - Fix unflagged overflows
 handling v4

On Fri, Jan 07, 2011 at 09:42:06PM +0300, Cyrill Gorcunov wrote:
> Don found that P4 PMU reads CCCR register instead of counter
> itself (in attempt to catch unflagged event) this makes P4
> NMI handler to consume all NMIs it observes. So the other
> NMI users such as kgdb simply have no chance to get NMI
> on their hands.

Acked-by: Don Zickus <dzickus@...hat.com>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/