Re: Re[8]: Unable to Configure Xen Dom 0 in Jeremy's PVOPS Kernel

["Teo En Ming" <enming.teo@asiasoftsea.net>]

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Dear Boris,

My colleague installed OpenSUSE 11.1 32-bit on the Core 2 Duo machine in our 
labs. Please see my earlier replies in the same topic.

I was too lazy to reformat and install 64-bit OpenSUSE, so I proceeded with 
Xen Dom 0 pvops kernel compilation on 32-bit Linux host.

I admit I am getting a lot of headache. Haha.

Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering) 
BEng(Hons)(Mechanical Engineering)

Technical Support Engineer

Information Technology Department
  
Asiasoft Online Pte Ltd
  
Tampines Central 1 #04-01 Tampines Plaza
  
Singapore 529541

Republic of Singapore
  
Mobile Phone: +65-9648-9798
  
MSN: teoenming@hotmail.com


-----Original Message-----

From: Boris Derzhavets <bderzhavets@yahoo.com>

To: enming.teo@asiasoftsea.net, Pasi Kärkkäinen <pasik@iki.fi>

Cc: Sander Eikelenboom <linux@eikelenboom.it>, xen-devel@lists.xensource.com

Date: Fri, 24 Jul 2009 09:57:18 -0700 (PDT)

Subject: Re: Re[8]: [Xen-devel] Unable to Configure Xen Dom 0 in Jeremy's 
PVOPS Kernel




Once again, i don't see any reason to to run 32-bit OS on Core2Duo,
unless you like Xen head ache. Core development (PVOPS) is obviously
running in 64-bit environment. 

Boris.

--- On Fri, 7/24/09, Boris Derzhavets <bderzhavets@yahoo.com> wrote:

From: Boris Derzhavets <bderzhavets@yahoo.com>
Subject: Re: Re[8]: [Xen-devel] Unable to Configure Xen Dom 0 in Jeremy's 
PVOPS Kernel
To: enming.teo@asiasoftsea.net, "Pasi Kärkkäinen" <pasik@iki.fi>
Cc: "Sander Eikelenboom" <linux@eikelenboom.it>, 
xen-devel@lists.xensource.com
Date: Friday, July 24, 2009, 12:47 PM


>After doing the above, I re-installed back the Xen hypervisor, 
libraries and tools, and also >the kernel, initrd, and modules. Then I 
proceeded to reboot my machine. After rebooting, > my CentOS 4.7 32-bit PV 
guest is still able to start and run!

Why it wouldn't ? If your image stays  the same.

> I am still very puzzled! What causes the PV guest initially cannot 
start? Then what >subsequently causes the PV guest to suddenly be able to 
start and run???
That is not supposed to happen. I would suggest clean OS (without any built 
in xen  presence) install , followed by  Xen 3.4.1+pvops kernel  clean 
install.

Boris.

--- On Fri, 7/24/09, Teo En Ming <enming.teo@asiasoftsea.net> wrote:

From: Teo En Ming <enming.teo@asiasoftsea.net>
Subject: Re: Re[8]: [Xen-devel] Unable to Configure Xen Dom 0 in Jeremy's 
PVOPS Kernel
To: "Teo En Ming" <enming.teo@asiasoftsea.net>, "Pasi Kärkkäinen" 
<pasik@iki.fi>
Cc: "Sander Eikelenboom" <linux@eikelenboom.it>, 
xen-devel@lists.xensource.com
Date: Friday, July 24, 2009, 12:19 PM


Dear All,



I am very puzzled. In investigating the cause of the sudden success of 
the CentOS 4.7 32-bit PV guest being able to run, I have uninstalled 
virt-manager and all of its dependencies:



docbook

python-gtk-vnc

xen-libs 3.3.1

scrollkeeper

xen-tools 3.3.1

libvirt 0.4.6

libvirt-python

vm-install 0.3.24



Then I proceeded to "make uninstall" in xen-3.4-testing source tree, 
which also removed my self compiled Xen Dom 0 pvops enabled kernel, initrd 
and kernel modules.



After doing the above, I re-installed back the Xen hypervisor, 
libraries and tools, and also the kernel, initrd, and modules. Then I 
proceeded to reboot my machine. After rebooting, my CentOS 4.7 32-bit PV 
guest is still able to start and run!



I am still very puzzled! What causes the PV guest initially cannot 
start? Then what subsequently causes the PV guest to suddenly be able to 
start and run???



***scratches head***



Anyway my CentOS 4.7 guest domain is now running. I shall now proceed 
to virtualize OpenSolaris 2009.06.



Thank you.



Also see screenshots of my CentOS 4.7 PV guest here: 
http://teo-en-ming-aka-zhang-enming.blogspot.com/2009/07/creating-centos-47-32-bit.html

Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering) 
BEng(Hons)(Mechanical Engineering)

Technical Support Engineer

Information Technology Department
  
Asiasoft Online Pte Ltd
  
Tampines Central 1 #04-01 Tampines Plaza
  
Singapore 529541

Republic of Singapore
  
Mobile Phone: +65-9648-9798
  
MSN: teoenming@hotmail.com



-----Original 
Message-----
  
 From: "Teo En Ming" <enming.teo@asiasoftsea.net>
  
 To: "Teo En Ming" <enming.teo@asiasoftsea.net>, "Pasi 
Kärkkäinen" <pasik@iki.fi>
  
 Cc: Sander Eikelenboom <linux@eikelenboom.it>, 
xen-devel@lists.xensource.com
  
 Date: Fri, 24 Jul 2009 22:54:26 +0800
  
 Subject: Re: Re[8]: [Xen-devel] Unable to Configure Xen Dom 0 in 
Jeremy's PVOPS Kernel
  

  
 Hi Pasi,
  

  
It's very strange. Suddenly my CentOS 4.7 32-bit PV guest is able to 
start!!! Previously it refuses to start at all.
  

  
I think I must have changed something in Dom 0 when I attempted "yast 
--install virt-manager". This action might have solved the problem. When I 
tried to install virt-manager, it also tries to install xen-libs-3.3.1 and 
xen-tools-3.3.1 as dependencies. However, I started off my Xen Dom 0 pvops 
kernel install with Xen 3.4.1 rc8 branch.
  

  
I need to investigate more why suddenly my CentOS 4.7 32-bit PV guest 
is able to start.
  
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering) 
BEng(Hons)(Mechanical Engineering)
  
Technical Support Engineer
  
Information Technology Department
    
Asiasoft Online Pte Ltd
    
Tampines Central 1 #04-01 Tampines Plaza
    
Singapore 529541
  
Republic of Singapore
    
Mobile Phone: +65-9648-9798
    
MSN: teoenming@hotmail.com
  

  
-----Original 
Message-----
    
 From: "Teo En Ming" <enming.teo@asiasoftsea.net>
    
 To: "Pasi Kärkkäinen" <pasik@iki.fi>
    
 Cc: Sander Eikelenboom <linux@eikelenboom.it>, 
xen-devel@lists.xensource.com
    
 Date: Fri, 24 Jul 2009 21:54:00 +0800
    
 Subject: Re: Re[8]: [Xen-devel] Unable to Configure Xen Dom 0 in 
Jeremy's PVOPS Kernel
    

    
 Hi Pasi,
    

    
I realized that Fedora 10 32-bit anaconda installer does not 
install PAE kernel after mounting the guest disk image file. I mounted the 
guest disk image file using losetup and kpartx which adds device nodes to 
/dev/mapper. I examined the /boot directory after mounting the guest disk 
image file and found no PAE vmlinuz and initrd.
    

    
Still using the mounted Fedora 10 32-bit guest disk image file, I 
changed root to the guest disk filesystems and attempted to install the PAE 
kernel. Then I modified menu.lst to boot the PAE kernel. After modifying the 

grub configuration of the guest domain, I un-mounted the guest filesystem.
    

    
I proceeded to boot the F10 32-bit guest, since I changed to PAE 
kernel. It is able to boot now (since the PAE kernel is xen-aware) but then 
it complains cannot mount /dev/root. Probably something to do with the PAE 
initrd file.
    
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering) 
BEng(Hons)(Mechanical Engineering)
    
Technical Support Engineer
    
Information Technology Department
      
Asiasoft Online Pte Ltd
      
Tampines Central 1 #04-01 Tampines Plaza
      
Singapore 529541
    
Republic of Singapore
      
Mobile Phone: +65-9648-9798
      
MSN: teoenming@hotmail.com
    

    
-----Original 
Message-----
      
 From: Pasi Kärkkäinen <pasik@iki.fi>
      
 To: Teo En Ming <enming.teo@asiasoftsea.net>
      
 Cc: Sander Eikelenboom <linux@eikelenboom.it>, 
xen-devel@lists.xensource.com
      
 Date: Fri, 24 Jul 2009 16:31:19 +0300
      
 Subject: Re: Re[8]: [Xen-devel] Unable to Configure Xen Dom 0 
in Jeremy's PVOPS Kernel
      

      

      
On Fri, Jul 
24, 2009 at 08:37:09PM +0800, Teo En Ming wrote:
        
 > Hi
        
 >
        
 > I attempted to install Fedora 10 32-bit PV guest using
        
 > images/pxeboot/vmlinuz-PAE and 
images/pxeboot/initrd-PAE.img from the F10
        
 > media. The non-PAE kernel could not load the installer. 
I finished my Fedora
        
 > 10 32-bit PV guest installation but it also cannot boot 
up after
        
 > installation, same as the CentOS 4.7 PV guest 
installation.
        
 >
        

        
 Fedora 10 installer has a bug, as a default it installs 
non-PAE kernel for
        
 xen domU. You need to use a kickstart script (like this) to 
fix it:
        
 http://pasik.reaktio.net/fedora/f10-xen-domu-ks.cfg 
[http://pasik.reaktio.net/fedora/f10-xen-domu-ks.cfg]
        

        
 The important lines being:
        

        
 -kernel
        
 kernel-PAE
        

        
 (Fedora 10 and Fedora 11 default kernels are compiled with 
pv_ops Xen domU
        
 support enabled, so there's no need for separate kernel-xen 
with these distros).
        

        
 Fedora 11 doesn't have that installer bug, so it installs 
right
        
 out-of-the-box as Xen domU.
        

        
 What's the error you get when you start the guest after 
installation?
        
 Please paste the "xm log" as text.
        

        
 I don't have any problems with CentOS 5.3 dom0.
        

        
 -- Pasi
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