system/xen: Added (the Xen virtualization hypervisor)

Signed-off-by: Robby Workman <rworkman@slackbuilds.org>

3 files changed, 143 insertions, 0 deletions

diff --git a/system/xen/domU/README.domU b/system/xen/domU/README.domU
new file mode 100644
index 0000000000..f060dceece
--- /dev/null
+++ b/system/xen/domU/README.domU
@@ -0,0 +1,57 @@
+		HOW TO INSTALL A SLACKWARE DOMU XEN GUEST
+
+After the ordeal of installing and configuring LILO/GRUB, Xen, kernel-xen
+and possibly also a new initrd, editing /etc/rc.d/rc.local and 
+/etc/rc.d/rc.local_shutdown, and finally booting on your Slackware XenLinux,
+you might be wondering how are you to load you guest OS. If you look around,
+you might find Xen domU (unprivileged) guest that you can download from the
+Internet, but some of us might want to roll their own. This MINI-HOWTO shows
+how to install a Slackware domU guest. The fastest way is to mount your
+Slackware DVD on /media/SlackDVD, normally this is the mount point chosen by
+HAL. Then run the included domU.sh script. 
+
+# ./domU.sh
+
+This will install Slackware onto an 8GB file called slackware.img and a 500MB 
+swap file called swap_file. By default, a typical server installation ensues.
+
+Have a good look at the mydom file as you need to fill in the full path to the
+slackware.img and swap_file files.
+
+Then run the following command:
+
+# xm create -c mydom
+
+Your Slackware XenLinux domU should boot instantly.
+
+Since Xen domU support has been in mainline kernel for a while now, those that
+wish to have the best performance can compile a seperate domU kernel based on a
+stock Slackware kernel config.
+This is what you have to select/unselect when building domU only kernel:
+
+---
+Processor type and features  --->
+  [*] Paravirtualized guest support  --->
+    [*]   Xen guest support
+
+Bus options (PCI etc.)  --->
+  [ ] PCI support
+
+Device Drivers  --->
+  < > Serial ATA and Parallel ATA drivers  --->
+  SCSI device support  --->
+    < > SCSI device support
+---
+
+Disabling SCSI support frees up the /dev/sd* device names for use as Xen
+virtual block devices. Basicly, this changes their names from /dev/sd* to a
+Xen device name format /dev/xvd*. If this is left enabled, ocasionaly domU can
+get stuck in a reboot-loop, with this error:
+"XENBUS: Waiting for devices to initialise..."
+Naturaly, to get the best performance you can disable everything that you
+don't need in domU kernel.
+
+Note that these files are not intended for a production environment. Users who
+have particular requirements will need to set up their own methods, but these
+files might provide a good starting point. Refer to the Xen manual and 
+http://xen.org for more details and options.
diff --git a/system/xen/domU/domU.sh b/system/xen/domU/domU.sh
new file mode 100644
index 0000000000..d9b2792917
--- /dev/null
+++ b/system/xen/domU/domU.sh
@@ -0,0 +1,76 @@
+#!/bin/sh
+# This Script builds a Slackware domU Xen Guest on a Slackware host,
+# Although it might work correctly, this script is intended as a template, so
+# simplicity is the priority here.
+# Chris Abela <chris.abela@maltats.com>
+# 20100308
+# Updated by mario <mario@slackverse.org>
+# 20100904
+
+set -e
+
+# Build an image for the root file system and another for the swap
+# Default values : 8GB and 500MB resepectively.
+ROOT_MB=${ROOT_MB:-8000}
+SWAP_MB=${SWAP_MB:-500}
+dd if=/dev/zero of=slackware.img bs=1M count=0 seek=$ROOT_MB
+mkfs.ext4 -F slackware.img
+dd if=/dev/zero of=swap_file bs=1M count=0 seek=$SWAP_MB
+mkswap swap_file
+
+# Make a mountpoint for the root file system and mount it
+mkdir -p mnt
+mount -o loop slackware.img mnt
+
+# Make a mountpoint for proc and mount it
+mkdir -p mnt/proc
+mount --bind /proc mnt/proc
+
+##############################################################################
+#									     #
+# IMPORTANT : This assumes that you have mounted your Slackware DVD on	     #
+#		/media/SlackDVD						     #
+#									     #
+##############################################################################
+
+# This will install a "Server" with the listed packages
+for i in a ap d e f k l n t tcl; do
+  installpkg --root mnt/ /media/SlackDVD/slackware*/$i/*.t?z
+done
+chroot mnt /sbin/ldconfig
+
+# create fstab
+cat >mnt/etc/fstab <<EOF
+/dev/xvda2       swap             swap        defaults         0   0
+/dev/xvda1       /                ext4        defaults         1   1
+#/dev/cdrom      /mnt/cdrom       auto        noauto,owner,ro  0   0
+/dev/fd0         /mnt/floppy      auto        noauto,owner     0   0
+devpts           /dev/pts         devpts      gid=5,mode=620   0   0
+proc             /proc            proc        defaults         0   0
+tmpfs            /dev/shm         tmpfs       defaults         0   0
+EOF
+
+chroot mnt /usr/sbin/timeconfig		# Set the time
+chroot mnt /sbin/netconfig		# Set the network
+chroot mnt /usr/bin/passwd		# Set root's password
+
+# Before we could use xencons=tty and leave inittab and securetty files intact,
+# but that stopped working with new xen, so we fix it by adding hvc0.
+sed 's/^\(c[1-6]:123\)/#\1/' /etc/inittab
+echo -e '\nc1:1235:respawn:/sbin/agetty 38400 hvc0 linux' >> /etc/inittab
+echo -e '\nhvc0' >> /etc/securetty
+
+# This will save us an alarming (yet harmless) warning
+(cd mnt/lib/modules
+  if [ -d 2.6.33.4-smp ] ;then
+    # for Slack32
+    ln -s 2.6.33.4-smp 2.6.33.4-xen
+    else
+    # for Slack64
+    ln -s 2.6.33.4 2.6.33.4-xen
+  fi
+)
+
+# unmount proc and the filesystem
+umount mnt/proc
+umount mnt
diff --git a/system/xen/domU/mydom b/system/xen/domU/mydom
new file mode 100644
index 0000000000..0ac1ad69d7
--- /dev/null
+++ b/system/xen/domU/mydom
@@ -0,0 +1,10 @@
+kernel = "/boot/vmlinuz-xen"
+ramdisk = "/boot/initrd-xen.gz"
+memory = 128
+name = "slackware"
+vif = [ 'mac=00:16:3e:00:00:01']
+disk = [ 'file:/full_path_to/slackware.img,xvda1,w',
+	 'file:/full_path_to/swap_file,xvda2,w' ]
+root = "/dev/xvda1 ro"
+extra = "3"
+extra = "console=hvc0 elevator=noop"