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xen-devel
Re: [Xen-devel] pv_ops with xen-3.3
Thanks for the run down Mark. During the 'make menuconfig' I saw an
option for dom0 support for the kernel, so i was under the impression
that support was there. I was just wanting to play around with it and
see what happens. :)
OK, this may sound stupid but I gotta ask. :)
If support for dom0 does make it into mainline kernel will there be a
need to download xen versions any longer? Will Xen still need to be
built against a kernel that already has support for it inside the
kernel? If not, how would I tell what version of Xen I am using.
Like I said, that may sound stupid but had to ask.
Jon
Quoting Mark Williamson <mark.williamson@xxxxxxxxxxxx>:
Hi there Jon,
The Xen build process builds a XenLinux using patches in the Xen repository,
which are based on 2.6.18. This includes full support of all features under
both dom0 and domU.
The mainline Linux kernel has included - for some time - support for running
as a Xen domU through its pv_ops infrastructure. This support has been
getting full-featured and AFAIK most or all domU functions are now available
using appropriately-built kernel.org kernels.
Support for running as dom0 requires a kernel to support additional features
on top of the standard domU featureset. Mainline Linux has not had these in
any releases - and as far as I can tell the full dom0 functionality hasn't
been merged into 2.6.29. I could be wrong about this though, the Xen wiki
states 2.6.29 as a merge goal; if it's not in that release I'd
imagine it'd be
in the next one.
So, in summary:
If you want to run a kernel.org kernel as a domU then any recent release will
do.
If you want to run a kernel.org kernel as a dom0 using pv_ops dom0 support
then you may need to seek out and apply additional patches.
If you want to get a kernel.org kernel to run on dom0 out-of-the-box then you
may need to wait for the next release.
You need to get a dom0 kernel from somewhere, so if you're not bothered about
using the latest-and-greatest from kernel.org you can use the one built with
Xen.
Does that make sense?
The upstream merge of Xen functionality into kernel.org has taken
years longer
than originally anticipated, however the good news is that Jeremy
Fitzhardinge
has been doing a tremendous job of leading the effort and getting
progressively
more stuff in a state that is acceptable to the upstream community.
Hopefully
in the future kernel.org Linux will have full out-of-the-box support for Xen
and the 2.6.18-based fork will no longer be needed at all.
Cheers,
Mark
On Tuesday 10 February 2009 16:55:48 jonr@xxxxxxxxxx wrote:
I would like to try and test out the 2.6.29-rc4 kernel and see if I
can't get Xen-3.3-1 booting. I have patched the 2.6.28 kernel and have
a 2.6.29-rc4 kernel. I have configured the kernel to use xen by
following http://wiki.xensource.com/xenwiki/XenParavirtOps.
Now I have the kernel configured and built but am not quite sure how
to use this kernel with xen-3.3. When I downloaded the latest xen and
ran 'make world' it downloaded the 2.6.18 kernel and is building xen
against that. How do I make xen build against my kernel or do I even
need to?
Once xen-3.3 is done building do I just substitute my 2.6.29-rc4
kernel in the grub menu.conf or am I missing something?
Thanks for any help,
Jon
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