From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:40298)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <juergh@gmail.com>) id 1V9JvG-0001F9-Ci
	for qemu-devel@nongnu.org; Tue, 13 Aug 2013 15:06:30 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <juergh@gmail.com>) id 1V9JvB-0004L3-E0
	for qemu-devel@nongnu.org; Tue, 13 Aug 2013 15:06:26 -0400
Received: from mail-we0-x22d.google.com ([2a00:1450:400c:c03::22d]:56986)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <juergh@gmail.com>) id 1V9JvB-0004Kh-3x
	for qemu-devel@nongnu.org; Tue, 13 Aug 2013 15:06:21 -0400
Received: by mail-we0-f173.google.com with SMTP id x55so6951757wes.18
	for <qemu-devel@nongnu.org>; Tue, 13 Aug 2013 12:06:20 -0700 (PDT)
MIME-Version: 1.0
In-Reply-To: <520A75CE.6020600@redhat.com>
References: <CADLDEKvEVSXQeKKrU0Ke9cgMf2VBr=ooTmXrUgmb3C+XEmsSmA@mail.gmail.com>
	<520A58CD.9000404@suse.de> <520A641F.5040608@redhat.com>
	<520A65BD.3030408@redhat.com>
	<CADLDEKuywrpApDMo5SD8nT=gPoo6ADyjawkd_sJRD=5gxo0EQg@mail.gmail.com>
	<520A75CE.6020600@redhat.com>
Date: Tue, 13 Aug 2013 21:06:20 +0200
Message-ID: <CADLDEKuTR2jbw9XcHHtbBCS=qZcrvq-O_gWqkO2vMwAcjwzQSQ@mail.gmail.com>
From: Juerg Haefliger <juergh@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Subject: Re: [Qemu-devel] QEMU savevm RAM page offsets
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: Paolo Bonzini <pbonzini@redhat.com>
Cc: Michael Tokarev <mjt@tls.msk.ru>, Laszlo Ersek <lersek@redhat.com>, =?ISO-8859-1?Q?Andreas_F=E4rber?= <afaerber@suse.de>, qemu-devel@nongnu.org

On Tue, Aug 13, 2013 at 8:07 PM, Paolo Bonzini <pbonzini@redhat.com> wrote:
> Il 13/08/2013 19:52, Juerg Haefliger ha scritto:
>> I didn't mean to imply that the savevm format is broken and needed
>> fixing. I was just wondering if the data is there and I simply hadn't
>> found it. Upgrading QEMU is not an option at the moment since these
>> are tightly controlled productions machines. Is it possible to loadvm
>> a savevm file from 1.0 with 1.6 to then use guest-memory-dump?
>
> Yes, it should, but one important thing since 1.0 has been the merger of
> qemu-kvm and QEMU.  What distribution are you using?  I know Fedora
> allows qemu-kvm-1.0 to QEMU-1.6 compatibility, but I don't know about
> others.

Ubuntu 12.04


> Michael Tokarev is the maintainer of the Debian package, so he may be
> able to answer.
>
> Alternatively, you can modify your utility to simply add 512 MB to the
> addresses above 3.5 GB.

Is it really as simple as that? Isn't the OS (particularly Windows)
possibly doing some crazy remapping that needs to be taken into
account? meminfo on a VM with 4GB running Windows 2008 shows the
following:

C:\Users\Administrator\Desktop\MemInfo\amd64>MemInfo.exe -r
MemInfo v2.10 - Show PFN database information
Copyright (C) 2007-2009 Alex Ionescu
www.alex-ionescu.com

Physical Memory Range: 0000000000001000 to 000000000009B000 (154 pages, 616 KB)
Physical Memory Range: 0000000000100000 to 00000000DFFFD000 (917245
pages, 3668980 KB)
Physical Memory Range: 0000000100000000 to 0000000120000000 (131072
pages, 524288 KB)
MmHighestPhysicalPage: 1179648


...Juerg

> Paolo