Xen users - Feb 2007 - Patching a "vanilla" kernel for use with Xen dom0/domU

Hi folks,

If my understanding of the release notes is correct, the newest linux kernel
released yesterday (2.6.20) has xen stuff built right in.  So, my guess is
that a stock 2.6.20, appropriately configured, ought to work as a xen
dom0/domU without further patches.   Is this true, or am I reading too much
into the mention of xen virtualization in the  release notes?

So far, I have not succeeded in getting it to work, but the problems
I''ve
hit so far have been unrelated to xen.

And, while I''m asking, let me phrase a more general question.

In general, where can I find a list of patches (and a download site) to
patch any given stock kernel to a xen-capable one?  Is there a web site
somewhere that documents this?

Thanks,
Derek.


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On 2/5/07, Derek <xen@sherlockmail.com> wrote:
> Hi folks,
>
> If my understanding of the release notes is correct, the newest linux
kernel
> released yesterday (2.6.20) has xen stuff built right in.
It has pravirt_ops built in, AFAIK. But I don''t know which Xen version
will work with these. None of the currently released ones, I guess.

In the long term, maybe with the 3.0.5 release,  it will be these
things that Xen is using to communicate with the Linux Kernel (or vice
versa), but I don''t know which Xen version will bring this.
(I''m not
so deep into xen unstable to tell if this already works there).

Henning

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On Mon, Feb 05, 2007 at 10:22:41AM -0700, Derek wrote:
> Hi folks,
> 
> If my understanding of the release notes is correct, the newest linux
kernel
> released yesterday (2.6.20) has xen stuff built right in.  So, my guess is
> that a stock 2.6.20, appropriately configured, ought to work as a xen
> dom0/domU without further patches.   Is this true, or am I reading too much
> into the mention of xen virtualization in the  release notes?
While I really wish that were correct, sadly Xen is not merged upstream.
The 2.6.20 kernel has paravirt_ops which provides a generic way to plug
into para-virtualization to the kernel. The Xen implementation for 
paravirt_ops, however, is *not* merged.

So you still need to use either the (ancient) 2.6.16 official releases of
Xen 3.0.3/3.0.4, xen-unstable which is on 2.6.18, or the best option is to
use one of the OS distro kernels - Fedora, RHEL, Suse, Debian, etc
all forward port Xen 3.0.3/3.0.4 kernels to recent upstream kernels 
such as 2.6.18/19.

Regards,
Dan.
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