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RE: [Xen-users] Xen with newer-than-2.6.16.26

To: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
Subject: RE: [Xen-users] Xen with newer-than-2.6.16.26
From: Luke Crawford <lsc@xxxxxxxxx>
Date: Wed, 13 Sep 2006 14:26:57 -0700 (PDT)
Cc: xen ml <xen-users@xxxxxxxxxxxxxxxxxxx>, Derek <xen@xxxxxxxxxxxxxxxx>
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try hg clone http://xenbits.xensource.com/ext/linux-2.6.rc-xen.hg
or
hg clone http://xenbits.xensource.com/ext/linux-2.6.tip-xen.hg

(hg is the mercurial reveision control (or whatever they call them these days) tool that xen uses to keep track of source code. that command should leave you with a checkout of the repository.)

I don't know how well either of these work;

I'd suggest trying it out and subscribing to the -devel list so you can report issus there, but if you want to watch the progress of the port to 2.17, that is the place to go.


On Wed, 13 Sep 2006, Petersson, Mats wrote:

Date: Wed, 13 Sep 2006 19:41:08 +0200
From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
To: Derek <xen@xxxxxxxxxxxxxxxx>, xen ml <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] Xen with newer-than-2.6.16.26

________________________________

        From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Derek
        Sent: 13 September 2006 18:15
        To: xen ml
        Subject: [Xen-users] Xen with newer-than-2.6.16.26


        I'm having problems with my dom0 linux kernel, which I beleive
could be fixed by going to a newer linux kernel.   (The problems are not
related to XEN, and have to do with device driver support for ATAPI
support under SATA).  I've tried updating to 2.6.17 _non-xen_ and my
device driver problems are solved.  Now, if only I can update to 2.6.17
_with_ XEN.

        So I'd like to be able to run XEN with a 2.6.17 or later dom0
kernel.  It's not clear to me how to do this or even if it's possible.
I'm running Gentoo.  The latest xen-sources they currently have
available for emerge is 2.6.16.28.

        A few possible approaches which I've considered:

          - Convert a redhat fedora kernel-sources package from RPM to
tgz using rpm2targz, and try that.  They seem to have xen dom0
compatible release up to one of the 2.6.18 release candidates.


Any particular reason you can't juse use these packages directly? It
seems like the easiest way... Or is the problem that Gentoo doesn't have
a RPM-capable tool?



          - Start with a vanilla gentoo kernel-sources emerge, and apply
whatever patches are necessary to make them xen-dom0 compatible.  I have
absolutely no idea how to find these patches, or how realistic a goal
this is.

          - Start with the xen-sources 2.6.16.26 emerge, and apply
incrimental patches from kernel.org to get it up to 2.6.17 or later.

        Any folks with wisdom to share on which of the above approaches
is best?  Or any others I haven't thought of?  And any hints or tips
that will help me along the way.


If this was me, I would take the current Xen-Unstable (which uses
2.6.16.13), and apply ONLY the patch that fixes the particular problem
you're having (ATAPI + SATA). There should be a patch available on the
Linux Kernel Mailing List (I presume) for this particular problem. If
this patch doesn't apply cleanly, then you may want to look at adding
other patches prior to this patch, based on what's needed. This will
work best if there are relatively few changes to the SATA/ATAPI
components in between 2.6.16.13 and the 2.6.17 kernel that you need.
Which there is some chance that you'll get away with only one single
patch. I had a quick google for a suitable patch, but I couldn't find
one - but if you know what the exact problem description is, I think you
may be able to find it... I did find this tho':
http://linux-ata.org/software-status.html#atapi which states that ATAPI
is fixed from 2.6.15, which means that the stock kernel that comes with
Xen should work. Presumably you're having some further problems to that
- I can't say because I don't quite know the ins/outs of SATA + ATAPI.

--
Mats



        Thanks,
        Derek.




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