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

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

# make world
# make install-tools

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

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¶

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.

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

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
add hvc0 into /etc/securetty:
```
# vi /mnt/etc/securetty (add hvc0)
```
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¶

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
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¶

get pv_ops tree:
# git clone http://people.valinux.co.jp/~yamahata/xen-ia64/linux-2.6-xen-ia64.git/
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)
copy .config for pv_ops of domU:
# cp arch/ia64/configs/xen_domu_wip_defconfig .config
make kernel with pv_ops:
# make oldconfig
# make
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¶

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"

After boot xen and dom0, start xend:
```
# /etc/init.d/xend start
```

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

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