Xen users - Oct 2010 - Installing Xen 3.1.3 from source over an existing Xen hypervisor

Hi,

Initially, I had installed Xen 3.1 using "yum install" command in 
CentOS. However, now I am trying to re-install Xen 3.1.3 from source 
code (as I wanted to modify the code for some of  my experiments). For 
this, I just did "make xen; make tools; make install-xen; make 
install-tools". I did not do a "make world" since I wanted to use
the
linux kernel which was installed during my earlier install of Xen (using 
yum install").

I have a couple of questions regarding this:
1. Is this sufficient to make a completely new install of Xen which 
works perfectly?
2. I believe the answer for (1) above is No. This is because, after I 
did that, I am not able to run "xm" or "xend".
When I try to run xm (in root mode) I get the following error:
"Traceback (most recent call last):
   File "/usr/sbin/xm", line 8, in ?
     from xen.xm import main
   File "/usr/lib64/python2.4/site-packages/xen/xm/main.py", line 54,
in ?
     from xen.xm import console
   File "usr/lib64/python2.4/site-packages/xen/xm/console.py", line
19, in ?
ImportError: /usr/lib64/python2.4/site-packages/xen/lowlevel/xs.so: 
undefined symbol: xs_set_target".

Does any one know why I get this error? (an error in build process may be?).

Further, when I just run "xend", I get the following error:
"Traceback (most recent call last):
   File "/usr/sbin/xen-python-path", line 38, in ?
     print os.path.join(xen.util.auxbin.libpath(), p)
AttributeError: ''module'' object has no attribute
''libpath''"

Further a "ps aux" shows that xend is not running.

Can someone help me in fixing this problem? Is there a way to perform a 
fresh install of Xen 3.1.3 without having to downloading a new kernel?

Thanks in advance,
Virajith


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