[Qemu-devel] [Help]: How to setup a VM based on kernel source code.

[Qemu-devel] [Help]: How to setup a VM based on kernel source code.

[Zhi Yong Wu]

HI,

I have met one scenario; currently i want to set up a VM based on
latest kernel tree; but i  only have latest kernel source code and
compiled it on one fedora 15 workstation. To achieve the objective,
what actions should i take next step? use -kernel -initrd options?
other ways?

If you have this experience, pls give me one hand. thanks.

-- 
Regards,

Zhi Yong Wu

Re: [Qemu-devel] [Help]: How to setup a VM based on kernel source code.

[Stefan Hajnoczi]

On Fri, Aug 19, 2011 at 10:58 AM, Zhi Yong Wu <zwu.kernel@gmail.com> wrote:
> I have met one scenario; currently i want to set up a VM based on
> latest kernel tree; but i  only have latest kernel source code and
> compiled it on one fedora 15 workstation. To achieve the objective,
> what actions should i take next step? use -kernel -initrd options?
> other ways?

You can build a kernel with all drivers (e.g. virtio-net, virtio-blk)
compiled in and then boot using -kernel and -append.  I find that
simplest.

Stefan

Re: [Qemu-devel] [Help]: How to setup a VM based on kernel source code.

[Zhi Yong Wu]

On Fri, Aug 19, 2011 at 9:14 PM, Stefan Hajnoczi <stefanha@gmail.com> wrote:
> On Fri, Aug 19, 2011 at 10:58 AM, Zhi Yong Wu <zwu.kernel@gmail.com> wrote:
>> I have met one scenario; currently i want to set up a VM based on
>> latest kernel tree; but i  only have latest kernel source code and
>> compiled it on one fedora 15 workstation. To achieve the objective,
>> what actions should i take next step? use -kernel -initrd options?
>> other ways?
>
> You can build a kernel with all drivers (e.g. virtio-net, virtio-blk)
> compiled in and then boot using -kernel and -append.  I find that
> simplest.
I tried this method, and it seemed to not work.:)

>
> Stefan
>



-- 
Regards,

Zhi Yong Wu

Re: [Qemu-devel] [Help]: How to setup a VM based on kernel source code.

[Rob Landley]

On 08/19/2011 04:58 AM, Zhi Yong Wu wrote:
> HI,
> 
> I have met one scenario; currently i want to set up a VM based on
> latest kernel tree; but i  only have latest kernel source code and
> compiled it on one fedora 15 workstation. To achieve the objective,
> what actions should i take next step? use -kernel -initrd options?
> other ways?
> 
> If you have this experience, pls give me one hand. thanks.

I've done this, the project is at http://landley.net/aboriginal

It a big bash script that:

A) downloads source code
B) builds a cross compiler (for any of a dozen targets)
C) builds a new root filesystem and kernel
E) packages it up into a system image qemu can boot.

The system images include shell scripts that invoke qemu with the
appropriate command line arguments.

You can download the build scritps here:

  http://landley.net/aboriginal/downloads

You can download prebuilt binary tarballs for each supported target here:

  http://landley.net/aboriginal/downloads/binaries

What you probably want to do is grab something like
system-image-armv5l.tar.bz2, extract it, "./run-emulator.sh" (which
should give you a shell prompt inside the emulator, type "exit" when
done), and then once you're happy it works for you look at the
run-emulator.sh script to see how it's invoking qemu, then look at the
build scripts to see how it's compiling everything.  (There's no make
magic or python or anything in there, it's all just bash scripts.)

Each of those system images has the relevant config files used to build
the kernel, uClibc, and busybox in the /usr/src directory.

A few years ago I wrote up a giant lump of documentation here:

  http://landley.net/aboriginal/downloads/presentation.pdf

I'm putting together a 1.0.3 release with Linux 3.0, busybox 1.19.0, and
uClibc 0.9.32 this weekend.  If you don't want to wait for the release,
go to http;//landley.net/hg/aboriginal and click on one of the download
links near the top to get a tarball of the current build scripts from
source control.

Rob