Re: [Xen-devel] Xen not working with stock Debian Wheezy 3.2 kernel on a Core 2 Duo box

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 08.07.13 at 15:42, Wei Liu <wei.liu2@xxxxxxxxxx> wrote:
> On Mon, Jul 08, 2013 at 02:16:07PM +0100, Jan Beulich wrote:
> [...]
>> 
>> > 3.2.0-4-amd64 (just found out that there's actually backtrace in dmesg):
>> > [    0.000000] BIOS-provided physical RAM map:
>> > [    0.000000]  BIOS-e820: 0000000000000000 - 000000000008f000 (usable)
>> > [    0.000000]  BIOS-e820: 000000000008f000 - 00000000000a0000 (reserved)
>> > [    0.000000]  BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
>> > [    0.000000]  BIOS-e820: 0000000000100000 - 00000000ce69a000 (usable)
>> > [    0.000000]  BIOS-e820: 00000000ce69a000 - 00000000ce6f1000 (ACPI NVS)
>> > [    0.000000]  BIOS-e820: 00000000ce6f1000 - 00000000cf5fb000 (usable)
>> > [    0.000000]  BIOS-e820: 00000000cf5fb000 - 00000000cf608000 (reserved)
>> > [    0.000000]  BIOS-e820: 00000000cf608000 - 00000000cf6a5000 (usable)
>> > [    0.000000]  BIOS-e820: 00000000cf6a5000 - 00000000cf6aa000 (ACPI data)
>> > [    0.000000]  BIOS-e820: 00000000cf6aa000 - 00000000cf6ab000 (usable)
>> > [    0.000000]  BIOS-e820: 00000000cf6ab000 - 00000000cf6f2000 (ACPI NVS)
>> > [    0.000000]  BIOS-e820: 00000000cf6f2000 - 00000000cf6ff000 (ACPI data)
>> > [    0.000000]  BIOS-e820: 00000000cf6ff000 - 00000000cf700000 (usable)
>> > [    0.000000]  BIOS-e820: 00000000cf700000 - 00000000d0000000 (reserved)
>> > [    0.000000]  BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved)
>> > [    0.000000]  BIOS-e820: 0000000100000000 - 000000022c000000 (usable)
>> 
>> So no such block right off the BIOS. You're not using Xen TXT code
>> by chance? Off the top of my head I don't recall any other place
>> where multiple RAM pages might get turned into "unusable".
>> 
> 
> I don't think so but I'm not sure. I don't see any TXT option in BIOS
> setting, so I presume that mother board doesn't have such thing -- it's
> pretty old.

Odd - the only other place where we do such conversion is when
clipping memory, which shouldn't be the case here (unless you
have a strange "mem=" option on your command line).

And with TXT, you'd at least have one line starting "TBOOT: " in your
hypervisor log.

Jan


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