Re: [Xen-users] question regarding booting custom guest kernel

[Aastha Mehta <aasthakm@xxxxxxxxx>]

On 27 September 2013 18:32, Wei Liu <wei.liu2@xxxxxxxxxx> wrote:

On Fri, Sep 27, 2013 at 06:15:28PM +0200, Aastha Mehta wrote: 

> >

>
> I first added the null hypercall in Xen hypervisor, and tested it through a
> simple test program in dom0 itself. That worked. I am now trying to get an
> application to make a syscall to the guest OS, and then the guest make
> hypercall to Xen.
>

What I meant is, if you want to use your kernel in a VM created by
xen-create-image, you can start with building a VM with the in-stock
kernel, verify that VM works as expected, then put your kernel in that
VM.

Wei.

I agree. So, this is what I tried. Use xen-create-image to create an image from a mirror.

And the output looks briefly like the following -

General Information

--------------------

Hostname       :  precise-guest

Distribution   :  precise

Mirror         :  http://de.archive.ubuntu.com/ubuntu/

Partitions     :  swap            128M  (swap)

                  /               20G   (ext3)

Image type     :  sparse

Memory size    :  512M

Networking Information

----------------------

IP Address     : DHCP [MAC: 00:16:3E:46:82:E4]

WARNING

-------

Loopback module not loaded and you're using loopback images

Run the following to load the module:

modprobe loop max_loop=255

Creating partition image: /home/domains/precise-guest/swap.img

Done

Creating swap on /home/domains/precise-guest/swap.img

Done

Creating partition image: /home/domains/precise-guest/disk.img

Done

Creating ext3 filesystem on /home/domains/precise-guest/disk.img

Done

Installation method: debootstrap

Done

Running hooks

Done

No role scripts were specified.  Skipping

Creating Xen configuration file

Done

Setting up root password

Enter new UNIX password:

Retype new UNIX password:

passwd: password updated successfully

All done

Installation Summary

---------------------

Hostname        :  precise-guest

Distribution    :  precise

IP-Address(es)  :  dynamic

RSA Fingerprint :

Root Password   :  N/A

This is successful and I have a config file that looks like this -

<config>

bootloader = '/usr/local/lib/xen/bin/pygrub'

vcpus       = '1'

memory      = '512'

root        = '/dev/xvda2 ro'

disk        = [

                  'file:/home/domains/precise-guest/disk.img,xvda2,w',

                  'file:/home/domains/precise-guest/swap.img,xvda1,w',

                 ]

name        = 'precise-guest'

dhcp        = 'dhcp'

vif         = [ 'mac=00:16:3E:46:82:E4' ]

on_reboot   = 'restart'

on_crash    = 'restart'

</config>

Upon calling xl create /etc/xen/precise-guest.cfg, I get the following error:

Parsing config from /etc/xen/precise-guest.cfg

libxl: error: libxl_bootloader.c:628:bootloader_finished: bootloader failed - consult logfile /var/log/xen/bootloader.17.log

libxl: error: libxl_exec.c:118:libxl_report_child_exitstatus: bootloader [31933] exited with error status 1

libxl: error: libxl_create.c:900:domcreate_rebuild_done: cannot (re-)build domain: -3

And the log file says:

File "/usr/local/lib/xen/bin/pygrub", line 885, in <module>

raise RuntimeError, "Unable to find partition containing kernel"

This error confuses me, as the xen-create-image command shows that it is configuring ext3 on the given disk image:

Thanks

--
Aastha Mehta

MPI-SWS, Germany
E-mail: aasthakm@xxxxxxxxxxx

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