Re: [Xen-users] how to change Xen scheduler and enable the XM-FLASK in case Xen is not compiled from the source?

[Sarah Newman <srn@xxxxxxxxx>]

On 7/25/19 2:01 AM, tee as wrote:
> hello,
> thanks for the reply, i have the Dom0 working with debian 9 , but as i said
> i did not compile it from the source. I succeded at creating a new domain
> with credit2 scheduler by adding an entry to the file 40-custom.
> Concerning Flask it is disabled, i tried to add this line
> GRUB_CMDLINE_XEN="flask=enforcing" to the file /etc/default/grub but stil i
> cannot get it to work. Is there another solution? or i should add something
> else?
From looking at the xen source file xen/xsm/xsm_core.c, I think if 'XSM Framework' is not in the output of 'xl dmesg', then flask support is not 
compiled in.
As I mentioned before, you almost assuredly need to rebuild from source.

To get the source you can do one of the following:

* Download from packages.debian.org
* Add deb-src entries to /etc/apt/source.list and use 'apt-get source <package>'
* Download a release tarball from downloads.xenproject.org
* Use git to clone the xen repository from 
https://xenbits.xen.org/git-http/xen.git

I'd recommend using downloads.xenproject.org.

After getting source files, try the following:

https://wiki.xenproject.org/wiki/Compiling_Xen_From_Source#Build_Dependencies_-_Debian_.2F_Ubuntu
https://wiki.xenproject.org/wiki/Compiling_Xen_From_Source#Configure
https://wiki.xenproject.org/wiki/Compiling_Xen_From_Source#Build_.26_Install

Or if you use the Debian sources, you can try following Debians packaging 
process.
The standard tool for rebuilding is the command dpkg-buildpackage from the package dpkg-dev. But I think for what you are doing, it is easier to 
ignore the Debian way right now.
> I also have another question concerning communication between domains. As
> far as i know they work using grant tables, but the structure of xen that i
> have running on my board(intel E3845) is different than what i see in
> tutorials. I do not have a source folder for xen so i cannot run make
> menuconfig command or compile anything, i also do not have the "include"
> folder and all .h files (expl xenbus.h ) are empty, does this mean that i
> have to take them from another distribution (i saw this on Ubuntu, but
> unfortunatly it does not work on my board) and put them inside the
> debian?or the installation is wrong?
> Thank you so much for your help!
I don't think the install is wrong. Those files are only used during development. Development files are typically in a separate package from runtime 
binaries.
For Ubuntu, xenbus.h is part of the libxen-dev package, which I discovered 
using the 'apt-file search' command.

--Sarah

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