关于xen的杂七杂八 (DomU安装)
DomU就是guest domain，安装一个domU基本上是个体力活，我自己好久不做了几乎都忘了，最近要测试几个系统所以又捡起来，这里把流程记录下，以后用脸滚键盘就行了。。。DomU分为两种：para-virtualization 和 hardware-virtualization，具体的解释去xen.org上看去。这两种DomU安装方法是不同的。Para-Virtualization（类虚拟化）：
pvm的启动目前需要pvgrub的支持(http://wiki.xen.org/wiki/PVGrub_HowTo)，在配置文件里指定为
kernel=/usr/lib/xen/boot/pv-grub-x86_64.gz
extra=(hd0,0)/boot/grub/menu.lst
Hardware-Virtualization（硬件辅助虚拟化）：
hvm的domU需要通过hvmloader启动(http://wiki.xen.org/wiki/Hvmloader)，如果你安装了xen，可以好好看下/etc/xen/xmexample.hvm的配置文件
下面是xen wiki摘录下来的一个例子
Example HVM guest configuration file for PVHVM use
Example configuration file ("/etc/xen/f16hvm") for Xen 4.x HVM guest VM using Linux PVHVM paravirtualized optimized drivers for disks and network:
kernel = "hvmloader"
builder='hvm'
device_model = 'qemu-dm'
name = "f16pvhvm"
memory = 1024
vcpus=1
pae=1
acpi=1
apic=1
vif = [ 'mac=00:16:4f:02:02:15, bridge=virbr0, model=e1000' ]
disk = [ 'phy:/dev/vg01/f16pvhvm-disk0,hda,w', 'file:/root/iso/Fedora-16-x86_64-DVD.iso,hdc:cdrom,r' ]
boot='cd'
xen_platform_pci=1
on_poweroff = 'destroy'
on_reboot = 'restart'
on_crash = 'restart'
sdl=0
vnc=1
vncpasswd=''
stdvga=0
serial='pty'
tsc_mode=0
usb=1
usbdevice='tablet'
keymap='en'
This example has been tested and is working on Fedora 16 Xen dom0 host using the included Xen 4.1.2 and Linux 3.1 kernel in dom0, and Fedora 16 Xen PVHVM guest VM, also using the stock F16 Linux 3.1 kernel with the out-of-the-box included PVHVM drivers.
pvm安装还有个注意的地方是pv driver的安装，请参考xen wiki
http://wiki.xen.org/wiki/Using_Xen_PV_Drivers_on_HVM_Guest
http://wiki.xen.org/wiki/XenLinuxPVonHVMdrivers
比如看如下一个配置
disk = [ 'file:/system.img,hda,w', 'file:/disk1.img,sda,w', 'file:/disk2.img,xvda,w', ]
对于hda，比如要在启动dom0时指定ide0=noprobe，这样就不会用qemu-dm来模拟hda；对于sda一般不指定，不然qemu会把sda用sym53c8xx的驱动来模拟；而xvda这类设备是不会用qemu-dm来模拟的，如果使用pv driver，指定xvda, xvdb这类设备是最好的选择
202 blockXen Virtual Block Device
0 = /dev/xvda First Xen VBD whole disk
16 = /dev/xvdb Second Xen VBD whole disk
32 = /dev/xvdc Third Xen VBD whole disk
...
240 = /dev/xvdp Sixteenth Xen VBD whole disk
Partitions are handled in the same way as for IDE
disks (see major number 3) except that the limit on
partitions is 15.
如果pv driver正确安装，dmesg | egrep -i 'xen|front'可以看到如下信息
[ 0.000000] Xen Platform PCI: I/O protocol version 1
[ 0.000000] Netfront and the Xen platform PCI driver have been compiled for this kernel: unplug emulated NICs.
[ 0.000000] Blkfront and the Xen platform PCI driver have been compiled for this kernel: unplug emulated disks
[ 0.000000] Xen HVM callback vector for event delivery is enabled
[ 2.377167] vbd vbd-5632: 19 xenbus_dev_probe on device/vbd/5632
[ 2.378134] blkfront: xvda: flush diskcache: enabled
[ 6.266448] Initialising Xen virtual ethernet driver.
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