1. 安装环境
操作系统：ubuntu14.04
xen版本：xen4.4
2. 依赖包的安装
在安装xen之前先进行依赖包的安装，在不停得尝试之后，总结出以下需要安装的依赖包。
sudo apt-get install gcc make binutils zlib1g-dev python-dev
sudo apt-get install libncurses5-dev libcurl4-openssl-dev libx11-dev
sudo apt-get install uuid-dev libyajl-dev libaio-dev libglib2.0-dev libpixman-1-dev
sudo apt-get install pkg-config bridge-utils iproute udev bison flex gettext
sudo apt-get install bin86 bcc iasl ocaml-nox ocaml-findlib cmake markdown figlet git libc6-dev-i386
sudo apt-get install texinfo texlive-latex-base texlive-latex-recommended texlive-fonts-extra
sudo apt-get install texlive-fonts-recommended pciutils-dev mercurial
以上的依赖包主要是为了能够成功的编译安装xen4.4
3. xen源文件下载
xen4.4源文件地址http://www.xenproject.org/downloads-list/xen-archives/xen-44-series/xen-440.html
源文件下载后是一个tar包，该包可以先下到windows下然后用winscp拷贝到虚拟机中，也可以直接在虚拟机中进行下载。
注意：tar包的解压一定要在ubuntu中进行，如果是在windows中解压之后再拷贝到ubuntu中的话，其中文件的执行级别就被修改了，会导致编译出错。
4. xen源文件编译
源文件解压到某个目录下之后，cd到源文件所在目录，执行步骤按照源文件中README里面描述的步骤来执行。
# ./configure
# make world
# make install
但是在执行make world执行完之后，会发现提示一个如下所示的错误：
tpmback.c: In function ‘tpmif_change_state’:
tpmback.c:350:4: error: format ‘%d’ expects argument of type ‘int *’, but argument 3 has type ‘enum xenbus_state *’ [-Werror=format=]
if(sscanf(value, "%d", &readst) != 1) {
在出现这个错误之后，源文件的编译后面无法执行了，在查找相关的资料之后，发现一段讨论：
From: Dushyant Behl <myselfdushyantbehl <at> gmail.com> Subject: Re: Compilation Error in extras/mini-os/tpmback.c Newsgroups: gmane.comp.emulators.xen.devel Date: 2014-07-18 10:01:50 GMT (2 weeks, 3 days, 2 hours and 27 minutes ago)
Sure, I'll be happy to do it.
On Fri, Jul 18, 2014 at 3:25 PM, Ian Campbell <Ian.Campbell <at> citrix.com> wrote:
> On Thu, 2014-07-17 at 20:21 +0200, Samuel Thibault wrote:
>> Ian Campbell, le Wed 16 Jul 2014 10:13:31 +0100, a écrit :
>> > On Wed, 2014-07-16 at 11:25 +0530, Dushyant Behl wrote:
>> > > I'm trying to compile xen from the source and i'm getting this
>> > > compilation error while running a make world.
>> > >
>> > > tpmback.c: In function ‘tpmif_change_state’:
>> > > tpmback.c:350:4: error: format ‘%d’ expects argument of type ‘int *’,
>> > > but argument 3 has type ‘enum xenbus_state *’ [-Werror=format=]
>> > > if(sscanf(value, "%d", &readst) != 1) {
>> > > ^
>> > > cc1: all warnings being treated as errors
>> > > make[3]: *** [/home/corvo/gsoc/code/xen/stubdom/mini-os-x86_64-vtpm/tpmback.o]
>> > > Error 1
>> > >
>> > > Could anyone explain that if this is just problem on my side or this
>> > > is not fixed in the git tree.
>> >
>> > It looks like a legitimate issue to me. I expect you are just the first
>> > person to use a compiler which picks up in this particular issue.
>> >
>> > I'm not sure what the correct fix is since C doesn't mandate very much
>> > about the storage size of an enum, so casting is probably not the right
>> > answer.
>>
>> Indeed, C99 apparently says “The choice of type is
>> implementation-defined”, so
>>
>> > Probably the value needs to be read into an actual int variable and then
>> > assigned to the enum.
>>
>> that seems like the proper solution.
>
> Great. Dushyant, are you able to rustle up a patch?
>
> http://wiki.xen.org/wiki/Submitting_Xen_Patches has some guidance on the
> procedure.
>
> Ian.
>
该讨论的地址为：http://thread.gmane.org/gmane.comp.emulators.xen.devel/207530/focus=207948
讨论的结果看起来应该是说这里是一个bug，需要加一个补丁。
Ian 这个人查了一下，应该是Hypervisor Project Team里面的一个成员。
5. 总结
至此，xen4.4版本的安装block住了，ubuntu下的安装应该是可以找到方法的，后面会继续进行测试。