Re: [Xen-devel] [Q]Which part of Xen is in slated for 2.6.23 kernel release?

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Mats Petersson wrote:
> At 12:21 21/07/2007, pradeep singh rautela wrote:
>> Hi Keir,
>> On 7/21/07, Keir Fraser <keir@xxxxxxxxxxxxx> wrote:
>>> On 21/7/07 10:50, "pradeep singh rautela" <rautelap@xxxxxxxxx> wrote:
>>>
>>> > Is Xen really a part of official 2.6.23 kernel now?
>>>
>>> Yes, assuming the patches are not dropped again from Linus's tree
>>> before
>>> 2.6.23 is released. But that is unlikely. They've had lots of
>>> testing and
>>> review.
>>
>> great news!!!
>>>
>>> > If yes i would like to ask
>>> >  - what is accepted by Linus in the mainline kernel?
>>> >  - Is it just the hypervisor code?
>>> >  - What about dom0?
>>>
>>> The scope of the patches is domU guest support. Vanilla linux 2.6.23
>>> will
>>> not support running as dom0 (Jeremy is working on this for a future
>>> Linux
>>> release). Nor does it contain the hypervisor code itself -- you have to
>>> obtain the Xen hypervisor separately from the kernel sources.
>>
>> Great!!!
>> So this means 2.6.23 vanilla kernel can be compiled as a domU
>> natively, right?
>
>
> I think for now, only modules can be shared, kernel itself needs to be
> compiled for DomU or Native use, but ultimately, the idea is to have
> one kernel that does both DomU and Native in the same kernel.

To clarify, you build the kernel once, and two build products are
vmlinux and bzImage.  If you have a bootloader which can handle it, you
can boot vmlinux natively, or under Xen.  Xen doesn't currently support
booting bzImage, so its really only usable for native execution.  But
it's just a matter of packaging; the kernel code and data is bit-for-bit
the same in both kernel images.

    J

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