From: Rene Herman <rene.herman-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: "linux-os (Dick Johnson)"
<linux-os-WNyZUJTdbT9Wk0Htik3J/w@public.gmane.org>
Cc: kvm-devel
<kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
Linux kernel
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>,
"David P. Reed" <dpreed-pPKjjScK5eQ@public.gmane.org>,
Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>,
"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
Date: Mon, 17 Dec 2007 19:54:58 +0100 [thread overview]
Message-ID: <4766C602.5050409@keyaccess.nl> (raw)
In-Reply-To: <Pine.LNX.4.61.0712171307150.4584-KUYkVxoy1ibZ8u7sGK6rWdBPR1lH4CV8@public.gmane.org>
On 17-12-07 19:14, linux-os (Dick Johnson) wrote:
> Attached is a patch that changes the outs to ins on port 0x80.
No, that isn't useful. Only a write is "guaranteed" to make ISA/LPC meaning
the timing for a read varies wildly. See the in/out cycles results posted
earlier. Was also reading the Intel PIIX(3) chiset datasheet today which
specifically mentions that only writes flow through to ISA, reads do not.
Rene.
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prev parent reply other threads:[~2007-12-17 18:54 UTC|newest]
Thread overview: 6+ 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>
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[not found] ` <1184274754.12353.254.camel@chaos>
[not found] ` <4761F193.7090400@reed.com>
2007-12-14 16:08 ` [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc Avi Kivity
2007-12-15 2:13 ` David P. Reed
[not found] ` <4763385E.9040106-pPKjjScK5eQ@public.gmane.org>
2007-12-15 2:20 ` H. Peter Anvin
2007-12-19 15:03 ` Avi Kivity
2007-12-17 18:14 ` linux-os (Dick Johnson)
[not found] ` <Pine.LNX.4.61.0712171307150.4584-KUYkVxoy1ibZ8u7sGK6rWdBPR1lH4CV8@public.gmane.org>
2007-12-17 18:54 ` Rene Herman [this message]
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