Xen devel - Nov 2008 - xen panic when intel VT set to "auto" in BIOS

Greetings
Trying to boot ubuntu 8.04.1  kernel 2.6.24-21-xen xen 3.2  leads to CPU 
panic.  BIOS has 2 options concerning Intel VT - Auto and Disabled . 
With disabled set everything works fine exept HVM domU support . After 
setting Auto option system fails to start.  bios flashed to latest version .

Hardware  Original description:
1x Dual-Core Xeon 1.6 GHz/1066 MHz (2x 2 MB L2 cache), 2x 512 MB 
PC2-5300 ECC AMF DDR SDRAMs, 0x 0 GB SATA HD (open bay), 48x CD-ROM, 
Broadcom 5721 KFB3 Gigabit Ethernet, ATI ES1000 (16 MB), 1x 670W power 
supply. In addition installed second CPU, 8 Gb DDr, Intel 5000P chipset
https://www-304.ibm.com/systems/support/supportsite.wss/selectproduct?familyind=5312474&typeind=5312476&modelind=5315615&osind=0&brandind=5000008&oldbrand=5000008&oldfamily=5312474&oldtype=5312476&taskind=2&psid=bm&continue.x=9&continue.y=17

  Sorry for photos, no serial console cable.


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Your second CPU is not an exact match with your first. You''ll have to
leave
VT disabled or use only one CPU. :-)

 -- keir

On 20/11/08 15:02, "Alexander Benaguev" <abenaguev@gmail.com>
wrote:
> Greetings
> Trying to boot ubuntu 8.04.1  kernel 2.6.24-21-xen xen 3.2  leads to CPU
> panic.  BIOS has 2 options concerning Intel VT - Auto and Disabled .
> With disabled set everything works fine exept HVM domU support . After
> setting Auto option system fails to start.  bios flashed to latest version
.
> 
> Hardware  Original description:
> 1x Dual-Core Xeon 1.6 GHz/1066 MHz (2x 2 MB L2 cache), 2x 512 MB
> PC2-5300 ECC AMF DDR SDRAMs, 0x 0 GB SATA HD (open bay), 48x CD-ROM,
> Broadcom 5721 KFB3 Gigabit Ethernet, ATI ES1000 (16 MB), 1x 670W power
> supply. In addition installed second CPU, 8 Gb DDr, Intel 5000P chipset
>
https://www-304.ibm.com/systems/support/supportsite.wss/selectproduct?familyin
>
d=5312474&typeind=5312476&modelind=5315615&osind=0&brandind=5000008&oldbrand=5
>
000008&oldfamily=5312474&oldtype=5312476&taskind=2&psid=bm&continue.x=9&contin
> ue.y=17 
> 
>   Sorry for photos, no serial console cable.
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel


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Keir Fraser wrote:
> Your second CPU is not an exact match with your first. You''ll have
to leave
> VT disabled or use only one CPU. :-)
Dear Keir, thanks for your reply. What makes you think so? It''s bought 
through IBM. It has special configurator according to which processors 
are exactly the same and additional cpu fits the configuration. And 
cpu''s markings are the same too.

Alexander

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On 20/11/08 16:00, "Alexander Benaguev" <abenaguev@gmail.com>
wrote:
> Keir Fraser wrote:
>> Your second CPU is not an exact match with your first. You''ll
have to leave
>> VT disabled or use only one CPU. :-)
> Dear Keir, thanks for your reply. What makes you think so? It''s
bought
> through IBM. It has special configurator according to which processors
> are exactly the same and additional cpu fits the configuration. And
> cpu''s markings are the same too.
It''s what a crash in that area of code is usually down to. You can
confirm
it -- boot native Linux and ''cat /proc/cpuinfo''. Take a look
at each
reported CPU''s model and stepping (you should get four, since you have
2 x
dual core). I think you''ll find steppings differ. We''ve had
this reported on
at least one IBM system in the past. If it is the problem, perhaps you could
get them to set you up with a properly matched pair?

 -- Keir



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Keir Fraser wrote:
> I think you''ll find steppings differ.
Yes, you are exactly right. It''s 6 and 11 steppings. Thank you.

Alexander

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