[Xen-users] Makefile warning, note and patch

[Mike Wright <xktnniuymlla@xxxxxxxxxxxxxx>]

Hi all,

(This is working with xen-3.0.2-2)

I needed to add some iptables extensions to my "xenified" linux kernel 
and encountered a few difficulties.  Maybe someone can benefit from what 
I've learned.
cd'ing to the linux tree and trying the traditional "make *config, make, 
make modules_install, make install" doesn't work any more.  The build 
instructions must be done from the xen top-level directory.
Yahoo led me to this:

    "http://seb.dbzteam.com/pages/xen_install.html";

where I found this:

    "make linux-2.6-xen0-config CONFIGMODE=xconfig".

The author does a great job of explaining how to configure the kernel(s) 
for "make".
I've also encountered problems with new builds not installing over parts 
of previous builds, particularly with the modules and python scripts. 
I've found success by moving or deleting the problematic directories: 
"/lib/modules/2.6.??-xen?" and "/usr/lib/python/*".
Lastly, the "make help" info seems a bit stale, especially the info for 
make uninstall.  Help says uninstalls xen tools.  *Blooey!*  Uninstall 
does a good job of removing all traces of any xen installations: new, 
old, experimental, etc.  Wipes the /boot partition of any file 
containing the character sequence "xen", suchas "boxen, maxent, vixen". 
 Any prior hypervisors and xen kernels are history, as well as any 
unfortunately named other files.  If you've had to build your own initrd 
those will probably disappear, too.
I'm not a c programmer and know less about autoconf, etc, but I did 
change the Makefile to clearly state that the /boot partition will be 
modified in ways that may not be intendended.  (I lost generations of 
builds.  I'm on the left coast US.  Did you hear me screaming over there 
in the UK? ;o)
Anyway, I strongly recommend to the developers that the attached patch 
be applied, or that someone else come up with a different warning. 
Might save somebody else a hearty round of expletives.
Happy xenning,
:m)

165,166c165,172
<       @echo '  uninstall        - attempt to remove installed Xen tools (use'
<       @echo '                     with extreme care!)'
---
>       @echo '  uninstall        - attempt to remove Xen installation.  NB: 
> this'
>       @echo '                     will also perform an "rm -rf /boot/*xen*".'
>       @echo '                     Any files in your /boot partition matching'
>       @echo '                     the glob "*xen*", including any 
> pre-existing'
>       @echo '                     kernels and hypervisors WILL BE DELETED.  
> RH,'
>       @echo '                     Fedora and CentOS users should note this 
> will'
>       @echo '                     destroy your custom initrd(s) if they have'
>       @echo '                     the word "xen" in the name.  USE WITH CARE'

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