From mboxrd@z Thu Jan  1 00:00:00 1970
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: Problems with merlot* AMD Opteron 6376 systems (Was
 Re: stable trees
Date: Fri, 26 Jun 2015 15:36:11 -0400
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To: Jan Beulich <JBeulich@suse.com>, Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>, suravee.suthikulpanit@amd.com, Ian Campbell <ian.campbell@citrix.com>
Cc: Lars Kurth <lars.kurth@citrix.com>, StefanoStabellini <stefano.stabellini@eu.citrix.com>, Andrew Cooper <Andrew.Cooper3@citrix.com>, Dario Faggioli <dario.faggioli@citrix.com>, Ian Jackson <Ian.Jackson@eu.citrix.com>, Anthony Perard <anthony.perard@citrix.com>, xen-devel <xen-devel@lists.xenproject.org>
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On 06/26/2015 10:52 AM, Jan Beulich wrote:
>>>> On 26.06.15 at 16:34, <ian.campbell@citrix.com> wrote:
>> I did this using rdmsr from mst-tools instead, running on a native
>> kernel gave:
>>
>> # for i in $(seq 0 31) ;do rdmsr -p $i MSR_K8_TOP_MEM2; done
>> 0
>> [...]
>> 0

Is MSR_K8_TOP_MEM2 defined somewhere in the shell?

Just to make sure, could you use explicit address, i.e.

     for i in $(seq 0 31) ;do rdmsr -p $i 0xc001001d; done

(and if they are still all zeroes, can you read 0xc0010010 (SYSCFG) as 
well?)

-boris


> Uniformly uncachable for everything above 4Gb then. And I suppose
> you already checked that there's no BIOS update available?
>
> I'm not sure if it would be reasonable for us to work around this.
> Suravee, Aravind - do you (or colleagues of yours) have any
> experience with systems mis-configured like this one?
>
> Otoh I'm then pretty confused by your E820 clipping experiment not
> having yielded any better results. I'm starting to suspect two
> problems...
>
> Jan
>