[libvirt] possible bug regarding cpu flag 'pclmulqdq' in cpu_map.xml

[Sven Kieske]

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Hi,

laine on IRC was so kind to redirect me to this list, so
I didn't file a BZ at:
https://bugzilla.redhat.com/enter_bug.cgi?product=Virtualization%20Tools
&component=libvirt
yet.

Please keep me CC'ed as I'm not subscribed to the list.

So here is my bug report:

Description of problem:
I believe the flag "pclmulqdq" is wrongly spelled in cpu_map.xml
leading to wrong cpu
being detected:

Version-Release number of selected component (if applicable):
current master:
https://libvirt.org/git/?p=libvirt.git;a=blob;f=src/cpu/cpu_map.xml;h=21
10c0b9b2a2a70f0334b2ff63416bd1b704b669;hb=HEAD

How reproducible:
always

Steps to Reproduce:
1.install e.g. ovirt, or some other libvirt consumer on a system with
a cpu like intel xeon E3-1230
2. it will get reported as nehalem
3.

Actual results:
cpu gets reported as "nehalem"

Expected results:
cpu gets reported as "sandy bridge"

Additional info:
I found no real info on this flag:
grep --color pclmuldq /usr/share/libvirt/cpu_map.xml
    <feature name='pclmuldq'>
      <feature name='pclmuldq'/>
      <feature name='pclmuldq'/>

wikipedia (not always right, I know) and Intel
just seem to know the flag
'pclmulqdq'

See:
https://en.wikipedia.org/wiki/CLMUL_instruction_set
https://en.wikipedia.org/wiki/CPUID#EAX.3D1:_Processor_Info_and_Feature_
Bits
https://software.intel.com/file/36945

But the Intel documentation is vast and I might have
missed information on their website.

So please check if this is the correct cpu flag indeed.

Thanks!

PS: If this is a real bug, it goes way back
into el6 released versions of libvirt, and
I would like to see a backport, if possible!

Here is the BZ which introduced the flag:
https://bugzilla.redhat.com/show_bug.cgi?id=761005
I guess this got wrongly typed, when you look
at this comment, which has the correct notation:
https://bugzilla.redhat.com/show_bug.cgi?id=761005#c16

- -- 
Mit freundlichen Grüßen / Regards

Sven Kieske

Systemadministrator
Mittwald CM Service GmbH & Co. KG
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