From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andi Kleen <ak@suse.de>
Cc: Ian Pratt <Ian.Pratt@cl.cam.ac.uk>,
Rik van Riel <riel@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
akpm@osdl.org, Steven.Hand@cl.cam.ac.uk,
Christian.Limpach@cl.cam.ac.uk, Keir.Fraser@cl.cam.ac.uk
Subject: Re: arch/xen is a bad idea
Date: Thu, 16 Dec 2004 13:19:06 +0000 [thread overview]
Message-ID: <1103203145.3804.13.camel@localhost.localdomain> (raw)
In-Reply-To: <20041216140954.GA29761@wotan.suse.de>
On Iau, 2004-12-16 at 14:09, Andi Kleen wrote:
> Also e.g. for non performance critical
> things like changing MTRRs or debug registers it would be IMHO much
> cleaner to just emulate the instructions (the ISA is very well
> defined) and not change the kernel here. From a look at Ian's list
> the majority of the changes needed for Xen actually fall into
> this category.
There are so many problems in snooping and decoding instructions it
isn't funny. Aside from the mmap pci buffer half way through instruction
that will emulate type stuff there are a lot of awkward issues if you
want to emulate multiple mtrr sets (you need PAT).
Xen has tried the decode/patch stuff earlier - see the early NPTL
handling and it was neither pretty nor reliable.
next prev parent reply other threads:[~2004-12-16 14:20 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <41BF1983.mailP9C1B91GB@suse.de.suse.lists.linux.kernel>
2004-12-14 18:59 ` arch/xen is a bad idea Andi Kleen
2004-12-14 19:35 ` Antonio Vargas
2004-12-14 22:40 ` Ian Pratt
2004-12-15 4:49 ` Andi Kleen
2004-12-16 0:09 ` Alan Cox
2004-12-16 4:01 ` Andi Kleen
2004-12-16 12:54 ` Alan Cox
2004-12-16 14:09 ` Andi Kleen
2004-12-16 13:19 ` Alan Cox [this message]
2004-12-16 14:28 ` Andi Kleen
2004-12-16 20:37 ` Ian Pratt
2004-12-16 18:26 ` Andrew Morton
2004-12-16 18:57 ` Alan Cox
2004-12-16 21:00 ` Ian Pratt
2004-12-16 21:03 ` Andrew Morton
2004-12-16 21:36 ` Ian Pratt
2004-12-16 21:39 ` Rik van Riel
2004-12-17 6:04 ` Andi Kleen
2004-12-17 8:26 ` Ian Pratt
2004-12-16 22:04 ` Philip R Auld
2004-12-16 23:08 ` Rik van Riel
2004-12-17 2:07 ` Philip R Auld
2004-12-17 6:03 ` Andi Kleen
2004-12-15 11:49 ` Pavel Machek
2004-12-16 1:14 ` Ian Pratt
2004-12-16 1:26 ` Pavel Machek
2004-12-16 14:21 ` Andi Kleen
2004-12-16 22:45 ` Bill Davidsen
2004-12-16 23:09 ` Rik van Riel
2004-12-20 15:08 ` arch/xen clue? Dorn Hetzel
2004-12-20 15:15 ` Ian Pratt
2004-12-20 15:23 ` Anton Altaparmakov
2004-12-20 15:34 ` Måns Rullgård
2004-12-15 11:51 ` arch/xen is a bad idea Pavel Machek
2004-12-17 16:05 ` William Lee Irwin III
2004-12-18 17:57 ` Ian Pratt
2005-02-25 11:43 ` Andrew Morton
2005-02-25 11:55 ` kernel 2.6.8-24.11-smp errors Marcel Smeets
2005-02-25 12:07 arch/xen is a bad idea Ian Pratt
2005-02-25 15:01 ` Andi Kleen
2005-02-25 22:37 ` Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2005-02-26 20:41 Ian Pratt
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