From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
	id 1NdZbq-0000I4-R0
	for qemu-devel@nongnu.org; Fri, 05 Feb 2010 20:37:18 -0500
Received: from [199.232.76.173] (port=40292 helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1NdZbq-0000Hr-Bm
	for qemu-devel@nongnu.org; Fri, 05 Feb 2010 20:37:18 -0500
Received: from Debian-exim by monty-python.gnu.org with spam-scanned (Exim
	4.60) (envelope-from <laurent.desnogues@gmail.com>)
	id 1NdZbp-0002x7-9A
	for qemu-devel@nongnu.org; Fri, 05 Feb 2010 20:37:17 -0500
Received: from mail-pz0-f187.google.com ([209.85.222.187]:59745)
	by monty-python.gnu.org with esmtp (Exim 4.60)
	(envelope-from <laurent.desnogues@gmail.com>) id 1NdZbo-0002wX-Ig
	for qemu-devel@nongnu.org; Fri, 05 Feb 2010 20:37:16 -0500
Received: by pzk17 with SMTP id 17so316718pzk.4
	for <qemu-devel@nongnu.org>; Fri, 05 Feb 2010 17:37:15 -0800 (PST)
MIME-Version: 1.0
In-Reply-To: <4B6CA26C.3060106@mail.berlios.de>
References: <761ea48b0907110814t12c644b6mf733d3b5e28e152@mail.gmail.com>
	<20091017195726.GB9922@laped.iglesias.mooo.com>
	<20091018030944.GB15656@shareable.org>
	<761ea48b0910180429l9fdf32r7f0a8f7ceebb9eee@mail.gmail.com>
	<4B6CA26C.3060106@mail.berlios.de>
Date: Sat, 6 Feb 2010 02:37:14 +0100
Message-ID: <761ea48b1002051737k6d6d33a5pbdcdf0e2527988c1@mail.gmail.com>
Subject: Re: [Qemu-devel] [PATCH] User mode: Handle x86_64 vsyscall
From: Laurent Desnogues <laurent.desnogues@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/pipermail/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Stefan Weil <weil@mail.berlios.de>
Cc: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, qemu-devel@nongnu.org

On Fri, Feb 5, 2010 at 11:57 PM, Stefan Weil <weil@mail.berlios.de> wrote:
> Laurent Desnogues schrieb:
[...]
>
> I'm still struggling with bntest and other x86_64-linux-user software
> calling any of the vsyscall functions.
>
> Laurent, your vsyscall patch only works on x86_64 hosts.
>
> A lot of software calls time() which uses vsyscall on x86_64 which
> does not work with x86_64-linux-user mode.

I'm not sure I understand what you mean.  Did you try
on some other host and it failed?  Was your host
32-bit?  If so, I'm afraid user-mode will fail for more
reasons than vsyscall.

> So the status of x86_64-linux-user is not more than experimental :-(
>
> I tried to modify x86_64-linux-user to set up a vsyscall page in high
> memory,
> but this seems to be difficult (at least with 32 bit host).
>
> Any hints how this should be done are welcome.

My patch explicitly prevents the linking of the vsyscall
page.

Could you provide more info about your host?


Laurent