Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756533AbbHZHD0 (ORCPT ); Wed, 26 Aug 2015 03:03:26 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:45749 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756205AbbHZHDX (ORCPT ); Wed, 26 Aug 2015 03:03:23 -0400 Message-ID: <55DD6589.7040007@oracle.com> Date: Wed, 26 Aug 2015 15:06:49 +0800 From: DuanZhenzhong Organization: Oracle Corporation User-Agent: Thunderbird 2.0.0.24 (X11/20101209) MIME-Version: 1.0 To: =?UTF-8?B?SnVlcmdlbiBHcm/Dnw==?= CC: LKML Subject: Re: dom0 panic with Upstream Linux 4.1 tree References: <55D18E10.4010903@oracle.com> <55DB55B4.7090107@suse.com> In-Reply-To: <55DB55B4.7090107@suse.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Source-IP: userv0021.oracle.com [156.151.31.71] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1426 Lines: 34 Juergen Groß wrote: > On 08/17/2015 09:32 AM, Zhenzhong Duan wrote: >> Hi Maintainers >> >> I found below panic when bootup OVM3.3.3 on HP PROLIANT DL980 G7 with >> dom0_mem=max:128G, not reproduce with dom0_mem=max:127G. >> Dom0 kernel is uek4 4.1.5-5.el6uek which is based on Upstream Linux 4.1 >> tree. This looks like an upstream issue. >> Appereciate any patch/fix. Thanks > > I don't think there is an easy patch in 4.1 to fix that. Your system has > half of the physical memory above the 512GB boundary making it > impossible for dom0 to use. Dom0 tries to use the memory layout of the > physical host, so it can only use memory below 512GB. > > As you try to allocate 128GB for Dom0 some of the memory will end above > the magic boundary (there is only a little bit less than 128GB below > the boundary available). > > For 4.3 I have posted a patch series which will eventually make it into > the kernel allowing Dom0 (and other pv-domains as well) to use memory > above the 512GB boundary. Understood, thanks Maybe the three level p2m tree need to be extended. Where could I find above patch series? I'd like to evaluate the work of porting them to 4.1 zduan > Juergen -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/