Xen Paravirtualized CentOS domU on CentOS 5.3 dom0

How to install paravirtualized CentOS 5.3 x64 as domU

# virt-install --paravirt \
               --name centosx64 \
               --ram 512 \
               --file /home/xen/images/centosx64.img \
               --file-size 10 \
               --nographics \
               --location http://mirrors.kernel.org/centos/5.3/os/x86_64/

It means Memory: 512MB, Disk Image: 10GB and No Graphics
Check the comment if you want to make use of pre-downloaded iso image or dvd.

If you want to add Desktop environment after instrallation, just add these.

# yum groupinstall "X Window System" 
# yum groupinstall "GNOME Desktop Environment"

Reference: http://www.cyberciti.biz/tips/rhel-centos-xen-virtualization-installation-howto.html

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Installing Fedora 10 on a MacBook Pro

Ubuntu was a really bad choice for XEN HVM dom0/domUs…
Fedora 10 doesn’t support xen kernel as well.
Back to Fedora 8…

http://www.linuxquestions.org/questions/fedora-35/xen-in-fedora-10-691804/

Install Xen Kernel on Ubuntu 9.04 Jaunty i386

I stole the kernel from debian’s pool.

wget http://ftp.debian.org/debian/pool/main/l/linux-2.6/linux-modules-2.6.26-2-xen-686_2.6.26-15_i386.deb
wget http://ftp.debian.org/debian/pool/main/l/linux-2.6/linux-image-2.6.26-2-xen-686_2.6.26-15_i386.deb
sudo dpkg -i linux-modules-2.6.26-2-xen-686_2.6.26-15_i386.deb
sudo dpkg -i linux-image-2.6.26-2-xen-686_2.6.26-15_i386.deb

* It’s a good idea to look for newer version. I don’t know why we cannot search by the debian website. But you can use the FTP…

Compiling XEN Kernel 2.6.29.2 on Ubuntu 9.04 32bit

I am compiling XEN Kernel 2.6.29.2 on Ubuntu 9.04 32bit
GCC is 4.3.3 and some issues with new compiler’s optimization.

This is on-going memo… I have compiled the kernel but it seems not compatible with Ubuntu 9.04.
So, I switched the xen kernel version supported by debian team.

References:

(1) http://www.infohit.net/blog/post/running-xen-on-ubuntu-intrepid-and-jaunty.html
(2) http://linux.derkeiler.com/Mailing-Lists/Kernel/2008-05/msg01854.html
(3) http://www.comptechdoc.org/os/linux/usersguide/linux_ugkernel.html
(4) http://bderzhavets.wordpress.com/2009/01/03/setup-xen-330-ubuntu-intrepid-server-dom0-via-build-xen-kernel-based-on-httpxenbitsxensourcecomextlinux-2627-xenhg/

Errors:

(1) undefined reference to `__udivdi3′
arch/x86/kernel/built-in.o: In function `timer_interrupt’:
/usr/src/linux-2.6.29.2-xen/arch/x86/kernel/time_32-xen.c:465: undefined reference to `__udivdi3′
make: *** [.tmp_vmlinux1] Error 1
root@ubunzzo:/usr/src/linux-2.6.29.2-xen# vi /usr/src/linux-2.6.29.2-xen/arch/x86/kernel/time_32-xen.c

My attempt after reading reference (2) was successful, I inserted the asm(“”:”+r”(delta)) to the timer_interrupt function at the while scope at line number around 500.

        /* System-wide jiffy work. */
        if (delta >= NS_PER_TICK) {
                do_div(delta, NS_PER_TICK);
                processed_system_time += delta * NS_PER_TICK;
                while (delta > HZ) {

                        asm("":"+r"(delta));

                        do_timer(HZ);
                        delta -= HZ;
                }
                do_timer(delta);
        }

* This works because this asm fools gcc compiler not to use optimization.
I guess do_timer internally uses do_div macro?

I found the same kind of fix in linux kernel here

The AT&T assembly format still looks confusing…