[Xen-users] Questions: pv domU and HVM dom U

[Wenda Ni <wonda.ni@xxxxxxxxx>]

Hello,

I have Xen 4.0.1 pvops on Ubuntu 10.10 following the steps on https://help.ubuntu.com/community/Xen
I use xen-tools to configure domU. In xen-tools.config, I specify 
"
kernel = /boot/vmlinuz-2.6.18.8
initrd = /boot/initrd.img-2.6.18.8
"
However, the actual .cfg file generated for domU uses 
"
bootloader = '/usr/bin/pygrub'
"
And when the domU starts, the "uname -a" also give kernel as 2.6.35.24-generic.

When I tried to edit the .cfg as 
"
kernel = '/boot/vmlinuz-2.6.18.8'
initrd = '/boot/initrd.img-2.6.18.8'
"
It gives me the error of "Error: (2, 'Invalid kernel', 'xc_dom_find_loader: no loader found\n')", when I try to start domU.

I googled the error, it seems to me that it is a matter of whether domU is pv-ops based or HVM?
So my question is 1) how to find whether domU is pv-ops or HVM?


Next, According to http://wiki.xen.org/xenwiki/XenParavirtOps?, I checked the ..../build-linux-2.6-pvops_x86_32/./config,

1. If building 32 bit kernel make sure you have CONFIG_X86_PAE enabled (which is set by selecting CONFIG_HIGHMEM64G)
   • non-PAE mode doesn't work in 2.6.25, and has been dropped altogether from 2.6.26 and newer kernel versions.
2. Enable these core options:
   1. CONFIG_PARAVIRT_GUEST
   2. CONFIG_XEN
3. And Xen pv device support
   1. CONFIG_HVC_DRIVER and CONFIG_HVC_XEN
   2. CONFIG_XEN_BLKDEV_FRONTEND
   3. CONFIG_XEN_NETDEV_FRONTEND

These options are all enabled, so I believe the dom0 built does support pv-ops domU. Then 2) how do I build a pv-ops domU?



I am new to this area, so please forgive my simple questions, and hope the reply can be easy to follow.




--

Cheers,

 

Wenda Ni, Ph.D.

Dept. of Computer Science and Engineering

State University of New York (SUNY) at Buffalo

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