Xen users - Jun 2005 - Xen interoperability among different version

Hi Xen list!

My question might be pretty dumb but please bear with me :-)
In which way are the different versions of Xen and versions of (Linux) 
kernels patched with Xen interoperable among each other?

I tried Xen on a Fedora Core 4 system (kernel 2.6.11-1.1369_FC4xen0) and 
whenever I would start a domU using the official 2.0.6 
vmlinuz-2.6.11.10-xenU or vmlinuz-2.4.30-xenU kernel, I''d get:

Using config file "foo.conf".
Error: Error creating domain: (0, ''Error'')

Here are the according entries in xm log:
[2005-06-27 03:41:13 xend] DEBUG (XendDomainInfo:770) init_domain> 
Created domain=1 name=ttylinux memory=6144
[2005-06-27 03:41:13 xend] INFO (console:94) Created console id=13 
domain=1 port=9601
[2005-06-27 03:41:13 xend] WARNING (XendDomainInfo:798) building dom 
with 1 vcpus
[2005-06-27 03:41:14 xend] ERROR (SrvBase:163) op=create: Error creating 
domain: (0, ''Error'')
Traceback (most recent call last):
   File "/usr/lib/python2.4/site-packages/xen/xend/server/SrvBase.py",
line 107, in _perform
     val = op_method(op, req)
   File 
"/usr/lib/python2.4/site-packages/xen/xend/server/SrvDomainDir.py",
line
71, in op_create
     raise XendError("Error creating domain: " + str(ex))
XendError: Error creating domain: (0, ''Error'')
[2005-06-27 03:41:14 xend] INFO (XendRoot:112) EVENT> 
xend.console.create [13, 1, 9601]

I tried another domU conf and got the same result with the two kernels 
from Xen Downloadpage.

Did I miss anything?

cheers,
  thomas

-- 
Thomas Maschutznig
Student des FH-Studiengangs Informationsmanagement
der FH JOANNEUM Gesellschaft mbH
Alte Poststraße 147, A 8020 Graz

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> My question might be pretty dumb but please bear with me :-)
> In which way are the different versions of Xen and versions of (Linux)
> kernels patched with Xen interoperable among each other?
Within each stable series (i.e. within 2.x.y)  we aim for binary 
compatibility.
> I tried Xen on a Fedora Core 4 system (kernel 2.6.11-1.1369_FC4xen0) and
> whenever I would start a domU using the official 2.0.6
> vmlinuz-2.6.11.10-xenU or vmlinuz-2.4.30-xenU kernel, I''d get:
AFAIK, the FC4 Xen comes from the -unstable development tree.  You''ll
need to
use the FC4 packaged kernels or build from (the FC4 revision of the) source, 
since -unstable isn''t compatible with Xen 2 anymore.

Cheers,
Mark
> Using config file "foo.conf".
> Error: Error creating domain: (0, ''Error'')
>
> Here are the according entries in xm log:
> [2005-06-27 03:41:13 xend] DEBUG (XendDomainInfo:770) init_domain>
> Created domain=1 name=ttylinux memory=6144
> [2005-06-27 03:41:13 xend] INFO (console:94) Created console id=13
> domain=1 port=9601
> [2005-06-27 03:41:13 xend] WARNING (XendDomainInfo:798) building dom
> with 1 vcpus
> [2005-06-27 03:41:14 xend] ERROR (SrvBase:163) op=create: Error creating
> domain: (0, ''Error'')
> Traceback (most recent call last):
>    File
"/usr/lib/python2.4/site-packages/xen/xend/server/SrvBase.py",
> line 107, in _perform
>      val = op_method(op, req)
>    File
>
"/usr/lib/python2.4/site-packages/xen/xend/server/SrvDomainDir.py",
line
> 71, in op_create
>      raise XendError("Error creating domain: " + str(ex))
> XendError: Error creating domain: (0, ''Error'')
> [2005-06-27 03:41:14 xend] INFO (XendRoot:112) EVENT>
> xend.console.create [13, 1, 9601]
>
> I tried another domU conf and got the same result with the two kernels
> from Xen Downloadpage.
>
> Did I miss anything?
>
> cheers,
>   thomas
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Hi Mark,
> AFAIK, the FC4 Xen comes from the -unstable development tree. 
You''ll need to
> use the FC4 packaged kernels or build from (the FC4 revision of the)
source,
> since -unstable isn''t compatible with Xen 2 anymore.
You were absolutely right; Fedora 4 is indeed following the -unstable tree.
> # xm dmesg|grep version
> Xen version 3.0-devel (bhcompile@build.redhat.com) (gcc version 4.0.0
20050519 (Red Hat 4.0.0-8)) Mon May 23 07:47:32 EDT 2005
..and using their kernel it works just fine.

Thanks for clarifying!

cheers,
  thomas

-- 
Thomas Maschutznig
Student des FH-Studiengangs Informationsmanagement
der FH JOANNEUM Gesellschaft mbH
Alte Poststraße 147, A 8020 Graz

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Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users