[all variants] How to QEMU + Kqemu

[bodhi.zazen]

How to QEMU + KQEMU

Home page: http://bellard.org/qemu/

This will be brief

Pros :

• Open source.
• qemu allows emulation of multiple processors.
• Supports 64 bit guests (on 64 bit hosts).
• Portability. qemu will run on Windows as well.

Cons: The biggest disadvantage is qemu is slow, even with kqemu.

For a more complete how-to on qemu see:

• https://help.ubuntu.com/community/Wi...UnderQemuHowTo

  Note: You do NOT need to compile kqemu (see below).

• http://ubuntu-tutorials.com/2007/07/...tu-704-feisty/

Installation

Installation is quite easy.

sudo apt-get install qemu

Qemu itself is slow so you may wish to add kqemu AKA "QEMU Accelerator".

For kemu :

Note: "kqemu" is an ambigious name.

1. kqemu the qemu accelerator. This is a kernel module that makes qemu faster.
2. kqemu the KDE application is a graphical interface/launcher for qemu.

sudo apt-get install kqemu-common kqemu-source

Add your user to the kqemu group
Log off and back on

Using any editor, edit /etc/modules (gksu gedit /etc/modules)
Add kqemu to the bottom of the list.

This will load kqemu at boot.
To load without re-booting

sudo modporbe kqemu

Running qemu (from the command line, using "/media/data/ubuntu-desktop.iso" as an example, you will need to provide a path to an iso image or virtual hard drive):

For 32 bit hosts:

qemu -cdrom /media/data/ubuntu-desktop.iso -m 512

For 64 bit hosts

qemu-system-x86_64 -cdrom /media/data/ubuntu-desktop.iso -m 512

To confirm you are using kqemu:

Enter the guest with your mouse (click in the box). Hit ctrl-alt-2
At the qemu command console enter "info-kqemu"
you should see:

(qemu) info kqemu kqemu support: enabled for user code

enter ctrl-alt-1 to return to the main console.

• From the command line. See man qemu.
• See also How to KVM

GUI Options

• qemu-launcher.
• qemulator.
• qtemu.
• kqemu (bad name, this is the KDE graphical front end).

bodhi.zazen

[TitaniumXJ]

Hello, Im kinda new to this, so I apologize in advance. I followed the following guide to run windows on my linux box.
https://help.ubuntu.com/community/Wi...UnderQemuHowTo

Once I get to step 11 I run into problems.
Install Windows XP. Put the CD in the drive and run:

qemu -localtime -cdrom /dev/cdrom -m 384 -boot d windows.img
I get this



I then googled around and found the following:
http://ubuntuforums.org/showthread.php?t=407729

Im stopped at the first step I get the following:

titan@titan-desktop:~$ /media/cdrom$ mount
bash: /media/cdrom$: No such file or directory
titan@titan-desktop:~$

Im at a loss and look to you, the Ubuntu gods for my answers.

[bodhi.zazen]

It is working on my system with a kubuntu cd. Is you Windows CD in working order ?

[pontifikas]

I have trouble getting qemu running with kqemu.
i followed your instructions, loaded the modules(kqemu) but when I run qemu, info kqemu returns "disabled".

I noticed that there is no point in this howto describing how kqemu is connected to qemu. Does qemu use it automaticaly?

I run 8.10.

I red in the homepage of qemu that qemu must be compiled with kqemu support:http://bellard.org/qemu/kqemu-doc.html
Is in ubuntu?

I thank you

[bodhi.zazen]

kqemu is a kernel module to accelerate qemu. In my experience it does not make qemu all *that* much faster and qemu + kqemu is slower then kvm, VirtualBox, or VMWare.

Can you provide a little more detail ? Did you add your user to the kqemu group ? log out and back in ? If you re-booted, did you re-load teh kqemu module ? Are you running a 64 bit host / guest ?

[pontifikas]

I'm running Intrepid guest on Intrepid host
I'm running at 32 bit using linux-source-2.6.27 I added and compiled myself.
I added the user at the kqemu group by modifying /etc/group.
I also added the kqemu module at the /etc/modules(lsmod reveals it) and I have rebooted.
The /dev/kqemu seems correctly installed(this is done automatically in intrepid doesn't it?).
I used both QTemu and Qemulator.
I even added -kernel-kqemu parameter in Qtemu or at the command produced by Qemulator and I still dont get kqemu to be used.

[Brazen]

These instructions seem to be lacking quite a few steps. Here is how to get kqemu installed and working:

sudo aptitude install -R module-assistant kqemu-common kqemu-source qemu linux-headers-server bridge-utils
sudo module-assistant prepare

sudo module-assistant auto-install kqemu



create /etc/udev/rules.d/60-kqemu.rules and put this in it:

KERNEL=="kqemu", NAME="%k", GROUP="kqemu", MODE="0660"



Create the kqemu group and add my user to it:

sudo addgroup --system kqemu

sudo adduser $USER kqemu



add 'kqemu' to /etc/modules



reboot, or "sudo /etc/init.d/udev reload" "sudo depmod -a" and "sudo modprobe kqemu"


kqemu will now be working. If you want to manage it with libvirt, also do this:

sudo aptitude install -R libvirt-bin virt-manager virt-viewer xauth

virt-manager and virt-viewer are gui apps that I sometimes use over an ssh X11 tunnel since I don't install X on my server. You could leave them out and use any old vnc viewer though. I'll often use a vnc viewer and connect by port forwarding through ssh to the vnc display port for the virtual machine on the server.