linux-sg2042/Documentation/ia64/xen.rst

********************************************************
Recipe for getting/building/running Xen/ia64 with pv_ops
********************************************************
This recipe describes how to get xen-ia64 source and build it,
and run domU with pv_ops.

Requirements
============

  - python
  - mercurial
    it (aka "hg") is an open-source source code
    management software. See the below.
    http://www.selenic.com/mercurial/wiki/
  - git
  - bridge-utils

Getting and Building Xen and Dom0
=================================

  My environment is:

    - Machine  : Tiger4
    - Domain0 OS  : RHEL5
    - DomainU OS  : RHEL5

 1. Download source::

	# hg clone http://xenbits.xensource.com/ext/ia64/xen-unstable.hg
	# cd xen-unstable.hg
	# hg clone http://xenbits.xensource.com/ext/ia64/linux-2.6.18-xen.hg

 2. # make world

 3. # make install-tools

 4. copy kernels and xen::

	# cp xen/xen.gz /boot/efi/efi/redhat/
	# cp build-linux-2.6.18-xen_ia64/vmlinux.gz \
	/boot/efi/efi/redhat/vmlinuz-2.6.18.8-xen

 5. make initrd for Dom0/DomU::

	# make -C linux-2.6.18-xen.hg ARCH=ia64 modules_install \
          O=$(pwd)/build-linux-2.6.18-xen_ia64
	# mkinitrd -f /boot/efi/efi/redhat/initrd-2.6.18.8-xen.img \
	  2.6.18.8-xen --builtin mptspi --builtin mptbase \
	  --builtin mptscsih --builtin uhci-hcd --builtin ohci-hcd \
	  --builtin ehci-hcd

Making a disk image for guest OS
================================

 1. make file::

      # dd if=/dev/zero of=/root/rhel5.img bs=1M seek=4096 count=0
      # mke2fs -F -j /root/rhel5.img
      # mount -o loop /root/rhel5.img /mnt
      # cp -ax /{dev,var,etc,usr,bin,sbin,lib} /mnt
      # mkdir /mnt/{root,proc,sys,home,tmp}

      Note: You may miss some device files. If so, please create them
      with mknod. Or you can use tar instead of cp.

 2. modify DomU's fstab::

      # vi /mnt/etc/fstab
         /dev/xvda1  /            ext3    defaults        1 1
         none        /dev/pts     devpts  gid=5,mode=620  0 0
         none        /dev/shm     tmpfs   defaults        0 0
         none        /proc        proc    defaults        0 0
         none        /sys         sysfs   defaults        0 0

 3. modify inittab

    set runlevel to 3 to avoid X trying to start::

      # vi /mnt/etc/inittab
         id:3:initdefault:

    Start a getty on the hvc0 console::

       X0:2345:respawn:/sbin/mingetty hvc0

    tty1-6 mingetty can be commented out

 4. add hvc0 into /etc/securetty::

      # vi /mnt/etc/securetty (add hvc0)

 5. umount::

      # umount /mnt

FYI, virt-manager can also make a disk image for guest OS.
It's GUI tools and easy to make it.

Boot Xen & Domain0
==================

 1. replace elilo
    elilo of RHEL5 can boot Xen and Dom0.
    If you use old elilo (e.g RHEL4), please download from the below
    http://elilo.sourceforge.net/cgi-bin/blosxom
    and copy into /boot/efi/efi/redhat/::

      # cp elilo-3.6-ia64.efi /boot/efi/efi/redhat/elilo.efi

 2. modify elilo.conf (like the below)::

      # vi /boot/efi/efi/redhat/elilo.conf
      prompt
      timeout=20
      default=xen
      relocatable

      image=vmlinuz-2.6.18.8-xen
             label=xen
             vmm=xen.gz
             initrd=initrd-2.6.18.8-xen.img
             read-only
             append=" -- rhgb root=/dev/sda2"

The append options before "--" are for xen hypervisor,
the options after "--" are for dom0.

FYI, your machine may need console options like
"com1=19200,8n1 console=vga,com1". For example,
append="com1=19200,8n1 console=vga,com1 -- rhgb console=tty0 \
console=ttyS0 root=/dev/sda2"

Getting and Building domU with pv_ops
=====================================

 1. get pv_ops tree::

      # git clone http://people.valinux.co.jp/~yamahata/xen-ia64/linux-2.6-xen-ia64.git/

 2. git branch (if necessary)::

      # cd linux-2.6-xen-ia64/
      # git checkout -b your_branch origin/xen-ia64-domu-minimal-2008may19

   Note:
     The current branch is xen-ia64-domu-minimal-2008may19.
     But you would find the new branch. You can see with
     "git branch -r" to get the branch lists.

       http://people.valinux.co.jp/~yamahata/xen-ia64/for_eagl/linux-2.6-ia64-pv-ops.git/

     is also available.

     The tree is based on

      git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 test)

 3. copy .config for pv_ops of domU::

      # cp arch/ia64/configs/xen_domu_wip_defconfig .config

 4. make kernel with pv_ops::

      # make oldconfig
      # make

 5. install the kernel and initrd::

      # cp vmlinux.gz /boot/efi/efi/redhat/vmlinuz-2.6-pv_ops-xenU
      # make modules_install
      # mkinitrd -f /boot/efi/efi/redhat/initrd-2.6-pv_ops-xenU.img \
        2.6.26-rc3xen-ia64-08941-g1b12161 --builtin mptspi \
        --builtin mptbase --builtin mptscsih --builtin uhci-hcd \
        --builtin ohci-hcd --builtin ehci-hcd

Boot DomainU with pv_ops
========================

 1. make config of DomU::

     # vi /etc/xen/rhel5
       kernel = "/boot/efi/efi/redhat/vmlinuz-2.6-pv_ops-xenU"
       ramdisk = "/boot/efi/efi/redhat/initrd-2.6-pv_ops-xenU.img"
       vcpus = 1
       memory = 512
       name = "rhel5"
       disk = [ 'file:/root/rhel5.img,xvda1,w' ]
       root = "/dev/xvda1 ro"
       extra= "rhgb console=hvc0"

 2. After boot xen and dom0, start xend::

	# /etc/init.d/xend start

   ( In the debugging case, `# XEND_DEBUG=1 xend trace_start` )

 3. start domU::

	# xm create -c rhel5

Reference
=========
- Wiki of Xen/IA64 upstream merge
  http://wiki.xensource.com/xenwiki/XenIA64/UpstreamMerge

Written by Akio Takebe <takebe_akio@jp.fujitsu.com> on 28 May 2008