From: "H. Peter Anvin" <hpa@zytor.com>
To: "David P. Reed" <dpreed@reed.com>
Cc: Avi Kivity <avi@qumranet.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
Rene Herman <rene.herman@keyaccess.nl>,
Pavel Machek <pavel@ucw.cz>,
kvm-devel <kvm-devel@lists.sourceforge.net>
Subject: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
Date: Fri, 14 Dec 2007 18:20:04 -0800 [thread overview]
Message-ID: <476339D4.2090802@zytor.com> (raw)
In-Reply-To: <4763385E.9040106@reed.com>
David P. Reed wrote:
>
> I believe (though no one seems to have confirming documentation from the
> chipset or motherboard vendor) that port 80 is actually functional for
> some unknown function on these machines. (They do respond to "in"
> instructions faster than a bus cycle abort does - more evidence).
>
This is normal. IN from port 0x80 is used by the DMA address map chip.
As far as I understand, there are other laptops with the same chipset
which don't have this problem, so it's likely either a motherboard or
firmware issue. My guess is that they probably let debugging code out
in the field (trap port 0x80 in SMM, and then try to output it on some
debugging bus.)
-hpa
next prev parent reply other threads:[~2007-12-15 2:21 UTC|newest]
Thread overview: 184+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <466F0941.9060201@reed.com>
[not found] ` <1181682498.8176.224.camel@chaos>
[not found] ` <469578CD.3080609@reed.com>
[not found] ` <1184216528.12353.203.camel@chaos>
[not found] ` <1184218962.12353.209.camel@chaos>
[not found] ` <46964352.7040301@reed.com>
[not found] ` <1184253339.12353.223.camel@chaos>
[not found] ` <469697C6.50903@reed.com>
[not found] ` <1184274754.12353.254.camel@chaos>
2007-11-12 16:55 ` [PATCH] x86: fix locking and sync bugs in x86_64 RTC code in time_64.c David P. Reed
2007-11-14 7:49 ` Thomas Gleixner
2007-11-14 13:10 ` David P. Reed
2007-11-14 18:26 ` Matt Mackall
2007-11-14 21:22 ` David P. Reed
2007-11-12 17:02 ` [PATCH] time: fix typo that makes sync_cmos_clock erratic David P. Reed
2007-11-14 7:57 ` Thomas Gleixner
2007-11-12 19:19 ` David P. Reed
2007-11-14 22:47 ` [PATCH] x86: fix freeze in x86_64 RTC update code in time_64.c David P. Reed
2007-11-14 22:49 ` [PATCH] time: fix typo that makes sync_cmos_clock erratic David P. Reed
2007-11-15 1:14 ` [PATCH] x86: on x86_64, correct reading of PC RTC when update in progress in time_64.c David P. Reed
2007-11-15 19:33 ` Thomas Gleixner
2007-11-15 20:31 ` David P. Reed
2007-11-15 22:17 ` Thomas Gleixner
2007-12-14 2:59 ` [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc David P. Reed
2007-12-14 7:49 ` Yinghai Lu
2007-12-14 9:45 ` Rene Herman
2007-12-14 14:23 ` Ingo Molnar
2007-12-14 14:36 ` Rene Herman
2007-12-14 14:46 ` Ingo Molnar
2007-12-14 14:56 ` Rene Herman
2007-12-14 18:36 ` Alan Cox
2007-12-14 18:48 ` H. Peter Anvin
2007-12-14 21:05 ` Pavel Machek
2007-12-15 22:59 ` Pavel Machek
2007-12-14 10:51 ` Andi Kleen
2007-12-14 11:11 ` David P. Reed
2007-12-14 13:15 ` Ingo Molnar
2007-12-14 13:24 ` Ingo Molnar
2007-12-14 13:47 ` Ingo Molnar
2007-12-14 14:41 ` Ingo Molnar
2007-12-14 13:42 ` Rene Herman
2007-12-14 14:03 ` Ingo Molnar
2007-12-14 14:10 ` Rene Herman
2007-12-14 14:21 ` Ingo Molnar
2007-12-14 18:02 ` H. Peter Anvin
2007-12-14 18:23 ` Rene Herman
2007-12-14 21:06 ` Pavel Machek
2007-12-14 22:13 ` H. Peter Anvin
2007-12-14 23:29 ` Alan Cox
2007-12-15 3:04 ` David P. Reed
2007-12-15 5:45 ` H. Peter Anvin
2007-12-15 17:17 ` David P. Reed
2007-12-15 17:46 ` Alan Cox
2007-12-17 22:50 ` Jan Engelhardt
2007-12-17 22:52 ` H. Peter Anvin
2007-12-15 8:08 ` Paul Rolland
2007-12-15 8:13 ` Rene Herman
2007-12-15 20:27 ` H. Peter Anvin
2007-12-15 23:26 ` [PATCH] x86: " Rene Herman
2007-12-15 23:51 ` H. Peter Anvin
2007-12-16 0:05 ` H. Peter Anvin
2007-12-16 13:15 ` [PATCH] x86: provide a DMI based port 0x80 I/O delay override Rene Herman
2007-12-16 15:22 ` Ingo Molnar
2007-12-17 1:43 ` Rene Herman
2007-12-17 2:05 ` H. Peter Anvin
2007-12-17 2:19 ` Rene Herman
2007-12-17 3:35 ` H. Peter Anvin
2007-12-17 13:02 ` Rene Herman
2007-12-17 17:14 ` H. Peter Anvin
2007-12-17 19:43 ` David P. Reed
2007-12-17 19:55 ` H. Peter Anvin
2007-12-17 21:02 ` David P. Reed
2007-12-17 21:17 ` H. Peter Anvin
2007-12-17 21:25 ` Alan Cox
2008-01-01 15:57 ` David P. Reed
2008-01-01 21:16 ` H. Peter Anvin
2008-01-01 15:59 ` David P. Reed
2008-01-01 16:15 ` Alan Cox
2008-01-01 16:43 ` Ingo Molnar
2008-01-01 17:32 ` Alan Cox
2008-01-01 18:45 ` Ingo Molnar
2008-01-01 20:14 ` Christer Weinigel
2008-01-01 21:13 ` Alan Cox
2008-01-01 21:07 ` Alan Cox
2008-01-02 10:04 ` Ingo Molnar
2008-01-02 13:11 ` [linux-kernel] " David P. Reed
2008-01-02 13:21 ` Ingo Molnar
2008-01-02 13:47 ` Alan Cox
2008-01-02 15:35 ` Rene Herman
2008-01-02 15:50 ` Rene Herman
2008-01-01 17:32 ` Christer Weinigel
2008-01-01 18:46 ` Ingo Molnar
2008-01-01 19:35 ` Christer Weinigel
2008-01-01 19:59 ` Rene Herman
2008-01-01 20:55 ` Christer Weinigel
2008-01-01 21:24 ` H. Peter Anvin
2008-01-01 21:01 ` Ingo Molnar
2008-01-01 21:26 ` Alan Cox
2008-01-01 21:42 ` Christer Weinigel
2008-01-01 21:42 ` Rene Herman
2008-01-01 21:50 ` H. Peter Anvin
2008-01-01 21:21 ` H. Peter Anvin
2008-01-01 23:05 ` Christer Weinigel
2008-01-01 23:12 ` Alan Cox
2008-01-02 0:23 ` Christer Weinigel
2008-01-02 10:00 ` Ingo Molnar
2008-01-01 17:32 ` David P. Reed
2008-01-01 17:38 ` Alan Cox
2008-01-01 21:15 ` H. Peter Anvin
2008-01-01 21:35 ` Rene Herman
2008-01-01 21:44 ` H. Peter Anvin
2008-01-01 22:35 ` Rene Herman
2008-01-01 22:39 ` H. Peter Anvin
2008-01-01 23:11 ` Rene Herman
2008-01-02 0:25 ` Rene Herman
2008-01-02 0:55 ` Christer Weinigel
2008-01-02 1:00 ` Rene Herman
2008-01-02 2:27 ` H. Peter Anvin
2008-01-09 17:27 ` Maciej W. Rozycki
2008-01-09 18:18 ` H. Peter Anvin
2008-01-01 17:31 ` Pavel Machek
2008-01-01 17:33 ` David P. Reed
2007-12-17 4:09 ` H. Peter Anvin
2007-12-17 10:57 ` Ingo Molnar
2007-12-17 11:29 ` Ingo Molnar
2007-12-17 13:34 ` David P. Reed
2007-12-17 12:15 ` Rene Herman
2007-12-17 13:09 ` Ingo Molnar
2007-12-17 13:22 ` Rene Herman
2007-12-17 13:31 ` Pavel Machek
2007-12-17 13:31 ` Rene Herman
2007-12-17 13:32 ` David P. Reed
2007-12-17 13:36 ` Rene Herman
2007-12-17 14:39 ` Ingo Molnar
2007-12-17 16:12 ` Alan Cox
2007-12-17 16:48 ` Ingo Molnar
2007-12-17 20:48 ` Rene Herman
2007-12-17 20:57 ` H. Peter Anvin
2007-12-17 21:33 ` Rene Herman
2007-12-17 21:40 ` H. Peter Anvin
2007-12-17 21:46 ` Ingo Molnar
2007-12-17 21:50 ` Rene Herman
2007-12-17 21:41 ` Ingo Molnar
2007-12-17 21:47 ` Rene Herman
2007-12-17 21:56 ` Ingo Molnar
2007-12-17 22:01 ` Rene Herman
2007-12-17 22:18 ` David P. Reed
2007-12-17 19:38 ` David P. Reed
2007-12-17 19:55 ` H. Peter Anvin
2007-12-17 21:28 ` Ingo Molnar
2007-12-16 21:42 ` H. Peter Anvin
2007-12-17 1:48 ` Rene Herman
2007-12-17 1:53 ` H. Peter Anvin
2007-12-16 23:12 ` David P. Reed
2007-12-17 1:56 ` Rene Herman
2007-12-17 2:04 ` H. Peter Anvin
2007-12-17 2:15 ` Rene Herman
2007-12-16 0:23 ` [PATCH] x86: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc David P. Reed
2007-12-15 20:26 ` [PATCH] x86_64: " H. Peter Anvin
2007-12-15 22:55 ` Pavel Machek
2007-12-16 9:27 ` Ingo Molnar
2007-12-17 21:04 ` Rene Herman
2007-12-17 23:20 ` Pavel Machek
2007-12-18 0:06 ` Alan Cox
2007-12-18 15:49 ` Lennart Sorensen
2007-12-17 22:46 ` Jan Engelhardt
2007-12-15 7:43 ` Ingo Molnar
2007-12-15 7:58 ` Rene Herman
2007-12-15 13:27 ` Ingo Molnar
2007-12-15 14:01 ` Rene Herman
2007-12-15 20:25 ` H. Peter Anvin
2007-12-15 14:29 ` Alan Cox
2007-12-15 16:19 ` David P. Reed
2007-12-15 16:48 ` Mark Lord
2007-12-15 17:51 ` Alan Cox
2007-12-15 23:00 ` Pavel Machek
2007-12-15 23:04 ` H. Peter Anvin
2007-12-16 9:40 ` Ingo Molnar
2007-12-16 21:43 ` H. Peter Anvin
2007-12-16 23:06 ` David P. Reed
2007-12-16 23:23 ` Pavel Machek
2007-12-16 23:34 ` H. Peter Anvin
2007-12-26 20:49 ` Pavel Machek
2007-12-17 1:51 ` Rene Herman
2007-12-14 16:08 ` Avi Kivity
2007-12-15 2:13 ` David P. Reed
2007-12-15 2:20 ` H. Peter Anvin [this message]
2007-12-17 18:14 ` linux-os (Dick Johnson)
2007-12-17 18:54 ` Rene Herman
2007-12-19 15:03 ` Avi Kivity
[not found] <fa.SxdP/X04a85FM81xaEZMBrrv9i4@ifi.uio.no>
[not found] ` <fa.tplCM7jT7JqanJcCtGK76o+Mdsw@ifi.uio.no>
[not found] ` <fa.lWVoQaFEkNNX7F+8WUJpMQjIODE@ifi.uio.no>
[not found] ` <fa.ng4A2MLKS/VR9lS0zt0LDJIDwi0@ifi.uio.no>
[not found] ` <fa.yZlGBJmYGGt3AQuIiiu7uMT3W9w@ifi.uio.no>
[not found] ` <fa.RR732o3u5kvPHNspJA9tM1WHlKI@ifi.uio.no>
2007-12-17 0:53 ` Robert Hancock
[not found] <fa.F/CPALGk5eBe3QDRN7pjalMH5m4@ifi.uio.no>
[not found] ` <fa.56LRmmk2ZdofP2s+juNK5l0iREQ@ifi.uio.no>
[not found] ` <fa.FRcgZwrZusfLF5d88S6yPr2bvYo@ifi.uio.no>
[not found] ` <fa.eZe9IlwlTeEF/5eA+8kKfNUncS4@ifi.uio.no>
[not found] ` <fa.EBJleK5JYl+P/h3+2m6zPq3PzDc@ifi.uio.no>
[not found] ` <fa.jU9nntHcOIpTOJuwui+u+/gya4Y@ifi.uio.no>
2007-12-17 0:57 ` Robert Hancock
2007-12-17 15:27 ` Ingo Molnar
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