From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([208.118.235.92]:41123)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <rth7680@gmail.com>) id 1Tqpsa-0007Q8-5L
	for qemu-devel@nongnu.org; Thu, 03 Jan 2013 13:51:03 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <rth7680@gmail.com>) id 1TqpsX-0006cO-DJ
	for qemu-devel@nongnu.org; Thu, 03 Jan 2013 13:51:00 -0500
Received: from mail-ie0-f177.google.com ([209.85.223.177]:49420)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <rth7680@gmail.com>) id 1TqpsX-0006cG-7N
	for qemu-devel@nongnu.org; Thu, 03 Jan 2013 13:50:57 -0500
Received: by mail-ie0-f177.google.com with SMTP id k13so18126696iea.8
	for <qemu-devel@nongnu.org>; Thu, 03 Jan 2013 10:50:56 -0800 (PST)
Sender: Richard Henderson <rth7680@gmail.com>
Message-ID: <50E5D30D.1090308@twiddle.net>
Date: Thu, 03 Jan 2013 10:50:53 -0800
From: Richard Henderson <rth@twiddle.net>
MIME-Version: 1.0
References: <1357219038-841-1-git-send-email-agraf@suse.de>
	<CAFEAcA-e8MMp9jXfjuagcVdXWZ_azYU3=O1hySzcCxKnKJapzg@mail.gmail.com>
	<7A6BA085-93BA-407E-AAE9-58247D779A2C@suse.de>
	<50E5D04E.8010107@mips.com>
In-Reply-To: <50E5D04E.8010107@mips.com>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [PATCH] linux-user: fix mips 32-on-64 prealloc case
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Eric Johnson <ericj@mips.com>
Cc: Peter Maydell <peter.maydell@linaro.org>, Riku Voipio <riku.voipio@linaro.org>, Michael Tokarev <mjt@tls.msk.ru>, Alexander Graf <agraf@suse.de>, qemu-devel qemu-devel <qemu-devel@nongnu.org>, Aurelien Jarno <aurelien@aurel32.net>

On 01/03/2013 10:39 AM, Eric Johnson wrote:
> While making this change please keep in mind that newer MIPS32
> processors allow more than 31 bits of user address space (up to 3.5
> GiB) if they have Enhanced Virtual Address support.

Interesting.

Well, would you be able to help figure out exactly what's going on in:

  http://lists.gnu.org/archive/html/qemu-devel/2012-12/msg03233.html

and the thread leading up to it?

Now, I don't *know* that this is an emulation failure -- the linux-user-test
binary certainly isn't aware of enhanced virtual addresses.  So it's
possible that (older?) binaries can't cope with more than 2GB.

Alternately, it really is a translation problem somewhere...


r~