Xen project Mailing List

Dne 6.5.2013 17:46, Luisa Posani napsal(a):

I use your configuration file

I have an error.
I try to rewrite..
EDD: Error 0c00 reading sector 96454
No DEFAULT or UI configuration directive found!
boot:

and stop.

Haven't seen this before. Are you sure that everything goes right? Specially image creation or paths to images?

Where is the problem???

I asked the question of iso image because I need to use a non standard kernel e fs.
Hence the decision to use buildroot.

And so

I try to use my buildroot fs and kernel

I create image with

xen-create-image --fs=ext2 --kernel=/home/posani/buildroot/buildroot-xen/output/images/bzImage --install-method=tar --initrd=/home/posani/buildroot/buildroot-xen/output/images/rootfs.tar --hostname=prova1 --dhcp --verbose --passwd --force

This command generate prova1.cfg file

cat prova1.cfg
#
# Configuration file for the Xen instance prova1, created
# by xen-tools 4.2 on Mon May 6 19:06:08 2013.
#

#
# Kernel + memory size
#
kernel      = '/home/posani/buildroot/buildroot-xen/output/images/bzImage'
ramdisk     = '/boot/initrd.img-2.6.32-5-xen-amd64'

vcpus       = '1'
memory      = '128'

#
# Disk device(s).
#
root        = '/dev/xvda2 ro'
disk        = [
                  'file:/home/xen/domains/prova1/disk.img,xvda2,w',
                  'file:/home/xen/domains/prova1/swap.img,xvda1,w',
              ]

#
# Physical volumes
#

#
# Hostname
#
name        = 'prova1'

#
# Networking
#
dhcp        = 'dhcp'
vif         = [ 'mac=00:16:3E:F0:3B:4A' ]

#
# Behaviour
#

on_reboot   = 'restart'
on_crash    = 'restart'

but when i make

xm create prova1.cfg
Using config file "./prova1.cfg".
Error: (2, 'Invalid kernel', 'elf_xen_note_check: ERROR: Will only load images built for the generic loader or Linux images')

Your kernel image is compiled without Xen PV options or is not properly bziped.

I'm looking for internet to resolve this error but I understand that I need xen on my kernel.
But I thought I could use a generic VM...

I'm confused...

Thanks for your help
I hope I explained well my problem.

;-)

Luisa

--- Lun 6/5/13, Jan Hejl <jh@xxxxxxxxxx> ha scritto:
Da: Jan Hejl <jh@xxxxxxxxxx>
Oggetto: Re: [Xen-users] Hardware virtualization
A: "Luisa Posani" <lposani@xxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxx
Data: Lunedì 6 maggio 2013, 15:26
What is your level of linux knowledge? Or IT at all?

This ISO contains LIVE version of Gentoo. Something like minimal ubuntu that's neccesary for ubuntu installation. You don't need to create anything. Go through install process and then you'll have your own system installed on domu-01.img.

Dne 6.5.2013 15:18, Luisa Posani napsal(a):
Hi Jan

I'm downloading
install-amd64-minimal-20130425.iso

and I try to work.

If I haven't this minimal image it's possible to work?
What does it contains?
How can I create this image?
--- Lun 6/5/13, Jan Hejl <jh@xxxxxxxxxx> ha scritto:
Da: Jan Hejl <jh@xxxxxxxxxx>
Oggetto: Re: [Xen-users] Hardware virtualization
A: "Luisa Posani" <lposani@xxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxx
Data: Lunedì 6 maggio 2013, 14:59
Create domU config file in /etc/xen/domu-01.cfg:
builder='hvm'
memory = 2048
name = "DomU-01"
vcpus=2
vif = [ 'bridge=xenbr1, script=vif-bridge, type=ioemu, model=e1000, mac=00:16:3e:63:80:88' ]
disk = [ 'file:/root/domu-01.img,hda,w',
        'file:/root/install-amd64-minimal-20130425.iso,hdc:cdrom,r'
]



boot="dc"
vnc=1
vnclisten="127.0.0.1"
vncpasswd=''
Download this http://distfiles.gentoo.org/releases/amd64/autobuilds/current-iso/install-amd64-minimal-20130425.iso to your /root folder. Create hard drive image:
dd if=/dev/zero of=/root/domu-01.img bs=1M count=10000
Start your domU with:
xl create /etc/xen/domu-01.cfg
Then you should be able to connect with Remmina to localhosts VNC and then you'll see Gentoo Live CD booting. Here's how to install Gentoo http://www.gentoo.org/doc/en/handbook/handbook-amd64.xml. Chapter 7 describes kernel compiling - custom config or genkernel.

When you'll be done with Gentoo installation, you shold poweroff you domU, change boot value to:
boot="cd"
And after:
xl create /etc/xen/domu-01.cfg
you should see your Gentoo booting up.

Hope this helps.

Jan

Dne 6.5.2013 14:41, Luisa Posani napsal(a):
Can you suggest me the simplest way to create a VM linux from scratch using kernel code source?

tks

Luisa

--- Lun 6/5/13, Jan Hejl <jh@xxxxxxxxxx> ha scritto:
Da: Jan Hejl <jh@xxxxxxxxxx>
Oggetto: Re: [Xen-users] Hardware virtualization
A: "Luisa Posani" <lposani@xxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxx
Data: Lunedì 6 maggio 2013, 13:11
Hi Luisa,

great news, i use Remmina also. Great tool.

'disk = ' is used for defining VM's hard drive. I'm not familiar with buildroot but as I read about CPIO it's file archiver and Xen disk image should be in RAW format. So you should extract rootfs.cpio to raw disk image which could be created with dd. Example:
dd if=/dev/zero of=rootfs.img bs=1M count=10000
As with normal hard drive you can use fdisk make some partitions on rootfs.img, format them and extract rootfs.cpio there. Then you can set this harddrive img in your xen config file for HVM style (hda but it should apper as sda inside domU):
disk = [ 'file:/path/to/rootfs.img,hda,w' ] 
Or you can pass the path to rootfs.img to xen-create-image. If rootfs.cpio contains all files including kernel image it should boot normally. As I wrote I'm not familiar with buildroot thus you're little bit on your own in this case and i'm sorry for not being more straightforward but you're using specific scenario. Maybe I'll save some time for testing this and let you know later on.

Have a nice day
Jan

Dne 6.5.2013 12:38, Luisa Posani napsal(a):
Hi Jan

I launch my windows VM whit graphical program named "Remmina Remote desktop client" and it work well..

:-) :-) :-) :-)

Maybe I was wrong a few parameters to launch manual gncviewer

Let me explain what is my main problem.
I would like to start a virtual machine created with buildroot standard WHITOUT XEN drivers in the VM.
I have some problems creating the configuration file for this virtual machine.
I don't know if I have to work with a ramdisk (rootfs.cpio created by buildroot) or not and
what should be the configuration file under (p.e.) /etc/xen/VM_buildroot.

I don't understand the meaning of the 'disk =' in the configuration file.

you know a tutorial that I could follow to create this file?

Xen provides the xen-create-image command to create the file, but I do not know how to give parameters to the command (initrd install-install-source method ...)

Can you help me?

Thanks in advance.

Luisa

--- Gio 25/4/13, Jan Hejl <jh@xxxxxxxxxx> ha scritto:
Da: Jan Hejl <jh@xxxxxxxxxx>
Oggetto: Re: [Xen-users] Hardware virtualization
A: "Luisa Posani" <lposani@xxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxx
Data: Giovedì 25 Aprile 2013, 11:19
Hi Luisa,

great, so you're cpu is capable for running Xen. The reason why you don't see it is explained here http://old-list-archives.xen.org/archives/html/xen-users/2010-09/msg00180.html.

Just to be clear. You've already start your system with xen and tried to start Windows Xp domU as this guide describes, do you? And the problem is that you can't connect to your Windows XP domU with GNCVIEWER or something else? Is your domU running? What does the "xl start" command say?

Thank you and have a nice day
Jan

Dne 24.4.2013 17:54, Luisa Posani napsal(a):
Hi

if I make

/proc/cpuinfo flags

without xen I found vmx.

when I start PC with xen flag vmx doesn't appare.

Why?

I would like use a guest OS make with buildroot "standard" without xen driver.

I use http://wiki.xen.org/wiki/Xen_Beginners_Guide#Configure_GRUB_to_start_Xen
but doesn't work correctly.

Doesn't work gvncviewer for using a window XP iso image and now I'm compiling a buildroot standard (qemu_x86 config).

Luisa

--- Mer 24/4/13, Jan Hejl <jh@xxxxxxxxxx> ha scritto:
Da: Jan Hejl <jh@xxxxxxxxxx>
Oggetto: Re: [Xen-users] Hardware virtualization
A: "Luisa Posani" <lposani@xxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxx
Data: Mercoledì 24 Aprile 2013, 17:08
Sure, I can.

You should check your cpuinfo if it supports virtualization. Look here http://virt-tools.org/learning/check-hardware-virt/

If it does, tell me what is your goal and what have you done already?

Dne 24.4.2013 16:03, Luisa Posani napsal(a):
Thank's for your indication.

I can't find my cpu in your list.

In my PC I can enable the virtualization from BIOS.

I don't understand the difference.

Can you help me please?

Luisa

--- Mer 24/4/13, Jan Hejl <jh@xxxxxxxxxx> ha scritto:
Da: Jan Hejl <jh@xxxxxxxxxx>
Oggetto: Re: [Xen-users] Hardware virtualization
A: xen-users@xxxxxxxxxxxxx
Data: Mercoledì 24 Aprile 2013, 10:35
Hello Luisa,

here http://en.wikipedia.org/wiki/List_of_IOMMU-supporting_hardware is a list IOMMU supporting hardware, this is a good point to start. IOMMU is not necessary for virtualization, but hardware listed here supports VM.

Jan

Dne 24.4.2013 09:43, Luisa Posani napsal(a):
Hi

It's my first experience with xen

I would like to use a OS linux create by buildroot like a guest.
I have a PC whit virtualizatin whit debian distribution and I install xen-linux-sysem on the PC.

In this PC a VM doesn't work correctly.

I would like to know if exist a simple tutorial to configure PC and VM .

Thanks in advance

Luisa
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