linux-kernel - Re: dom0 panic with Upstream Linux 4.1 tree

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Message-ID: <55DD655B.6010606@oracle.com>
Date:	Wed, 26 Aug 2015 15:06:03 +0800
From:	DuanZhenzhong <zhenzhong.duan@...cle.com>
To:	Juergen Groß <jgross@...e.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: dom0 panic with Upstream Linux 4.1 tree

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
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