Re: [Xen-users] Latest Xen Kernel

[Paul Schulze <avlex@xxxxxxx>]

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Am 17.07.2008 um 23:15 schrieb Christopher Isip:

> On Thu, Jul 17, 2008 at 6:07 AM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
> On Thu, Jul 17, 2008 at 11:43:42AM +0200, Paul Schulze wrote:
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> >
> > Hi Christopher,
> >
> > If you need some extended capabilities, the mainline kernel's Xen
> > support won't be much help. That includes pci passthrough support
> > (don't know when this'll ever be part of vanilla), but as long as  
> you
> > find the necessary patches, any kernel should work. I've found Xen
> > patches for kernel 2.6.25 in the debian linux-image source package
> > for example (though I haven't tried them yet, because it's a whole
> > lot of work to extract the ones that are necessary) and for my IPCop
> > Experimental DomU I'm using the Xen and IO delay patches from
> > Ubuntu's linux-image-2.6.24-18-xen source package (this one still  
> has
> > some issues with pci_dma_xen-32.c and random crashes, but works in
> > general) and I'm guessing there will be some patches for 2.6.26 in
> > one distribution or another soon too. You'll need a bit of knowledge
> > about how to extract the necessary stuff from those, about patching
> > and building the kernel and probably about fixing some stuff by hand
> > too (the Ubuntu 2.6.24 patches have issues with building a DomU-only
> > kernel for example). You could always extract a precompiled kernel
> > from a binary package though, but that might lead to problems with
> > the system later (if some patch is missing for example).
> >
>
> Ubuntu 8.04 LTS Linux 2.6.24 kernel contains "forward-port" of the  
> xensource
> 2.6.18 xen patches, with full xen functionality.
>
> Debian 2.6.25 Linux kernel contains the "native" pv_ops based xen  
> support,
> which is included in the upstream/vanilla kernel.org linux kernels.
>
> pv_ops based Linux xen kernel lacks many of the features from  
> xensource
> xen kernels unfortunately.. at the moment. Linux 2.6.26 adds more  
> features,
> and more are queue for inclusion in 2.6.27. The biggest (most  
> important) missing
> feature from pv_ops kernels is dom0 support.
>
> More info about pv_ops xen kernels:
> http://wiki.xensource.com/xenwiki/XenParavirtOps
>
> -- Pasi
>
> > Cheers,
> >
> >
> > Paul.
> >
> > - --
> > Paul Schulze
> > avlex@xxxxxxx
> > Public Key: http://solaris-net.dyndns.org/keys/key_avlex.asc
> >
> > "Making mistakes is human,
> > but to really fuck things up you need Computers"
> >
> >
> > Am 17.07.2008 um 06:10 schrieb Tim Post:
> >
> > >On Wed, 2008-07-16 at 23:02 -0400, Christopher Isip wrote:
> > >>What is the latest xen kernel that could be used in a domU?  I am
> > >>currently using Ubuntu 8.04 with 2.6.24-16.
> > >
> > >That kernel can be used in a dom-u , however your going to need an
> > >initrd since ext3 / ext2 are modular in that kernel.
> > >
> > >Any recent Linux kernel can be used as a dom-u kernel, this link
> > >should
> > >help you:
> > >
> > >http://wiki.xensource.com/xenwiki/Kernel.org_Linux_on_Xen
> > >
> > >
> > >Hope this helps.
> > >
> > >--Tim
> > >
> > >
> > >
>
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>
>
> Thanks for the replies.  I am interested mainly in forward ports as  
> the paravirt-ops in mainline dont have pciback capability.  So,  
> 2.6.25 will be paravirt-ops only?  To create a xenlinux kernel, I  
> must manually patch 2.6.25 with the xen patches in debian linux  
> source?
> Thanks
> Chris
Hi Chris,

You can try, but it isn't all that easy to isolate the necessary  
patches from the Debian source and I am not quiet sure if the patches  
in Debian are even forward-ported. As I said, I haven't tried yet (I  
probably will in the next week, because my IPCop DomU is acting up),  
but I think I saw something that looked like Xenbus and PCIFront last  
time I grepped through the patches. You better check before you put  
some serious work in there.
Cheers,


Paul.

- --
Paul Schulze
avlex@xxxxxxx
Public Key: http://solaris-net.dyndns.org/keys/key_avlex.asc

"Making mistakes is human,
but to really fuck things up you need Computers"

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