Tonneson DokuWiki

• Install and boot into non-Xen kernel
  • yum install kernel
  • Edit /etc/grub.conf, make sure non-Xen kernel is default
• Remove Xen
  • yum groupremove xen
  • Install KVM
  • Refer to [LinuxKVM]
• Disable Xen services
  • chkconfig xend off; service xend stop
  • chkconfig xendomains off; service xendomains stop
  • chkconfig rhn-virtualization-host off; service rhn-virtualization-host stop
• Convert Xen network scripts to standard sysconfig scripts

• Install a non-Xen kernel
  • yum install kernel kernel-devel
  • The kernel-devel may or may not be required but it often is
• Update /etc/grub.conf
  • Make sure the new non-Xen kernel is default
  • Make sure no kernel lines contain console=xvc0
• Modify /etc/modprobe.conf
  • Change alias eth0 xennet to alias eth0 virtio_net
  • Change alias scsi_hostadapter xenblk to alias scsi_hostadapter virtio_blk
• Make a new initrd (where kernel_ver is the non-Xen one just installed)

mkinitrd -f --with=virtio_blk --with=virtio_pci --builtin=xenblk /boot/initrd-kernel_ver.img kernel_ver

• Edit /etc/inittab
  • Remove co:2345:respawn:/sbin/agetty xvc0 9600 vt100-nav
  • Make sure lines containing :2345:respawn:/sbin/mingetty tty are not commented out
• Shutdown the guest on Xen host
  • halt
• Create a KVM config file for the new guest
  • On Xen host, virsh dumpxml guest_name>guest_name.xml
  • Copy this XML file to the KVM host, into /root or /tmp
• On KVM host, edit KVM config file to match values from Xen config*
  • Change domain type to kvm
  • Remove bootloader line
  • Change type arch='x86_64' machine='xenpv'linux/type to type arch='x86_64' machine='pc'hvm/type
  • Add this line under devices emulator/usr/libexec/qemu-kvm/emulator
  • Change driver name='phy'/ to driver name='qemu' type='raw'/
  • Change target dev='xvda' bus='xen'/ to target dev='vda' bus='virtio'/
  • Change mouse bus to ps2
• Define the domain on KVM host
  • virsh define /path/to/xml/guest.xml
• Start guest on KVM host
  • virsh start guest
• Clean-up tasks
  • Network (necessary only if eth0 is not active on reboot)
    • Stop network
    • Edit /etc/sysconfig/network-scripts/ifcfg-eth0 to original IP addr
    • Start network
  • Kernel
    • Uninstall old Xen kernels
    • rpm -ev kernel-xen kernel-xen-devel