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[Xen-devel] Re: [PATCH 0/3] dom0 linux: Add high MMIO area support

I suppose it depends what function we think the 2.6.18 tree should have. We
created the 2.6.27 tree specifically to allow development of new platform
features without needing large backports to old 2.6.18. Your concern over
what dom0 will be 'supported' by 3.4 is confused -- we ship no guest kernels
with Xen releases. Most users will install vendor Xen kernels, all of which
are newer than 2.6.18 and will not pick up platform-support backports from
our 2.6.18 tree. Even if they want a Xen-specific feature present only in
2.6.18, many will be put off trying that feature out by the fact that 2.6.18
is tragically old and they'll rightly fear feature regressions and security
holes (compared with newer kernels).

 -- Keir

On 03/12/2008 02:41, "Yuji Shimada" <shimada-yxb@xxxxxxxxxxxxxxx> wrote:

> I'd like to include high MMIO area support into dom0 linux for xen 3.4.
> Which linux will xen 3.4 support? I expect xen 3.4 will support both
> upstream linux and linux-2.6.18-xen.hg, because I think it is
> difficult to merge all function which linux-2.6.18-xen.hg has to
> upstream linux. Will xen 3.4 support linux-2.6.27-xen.hg too?
> I have more question. If we have some function to be included into
> future dom0 linux, what should we do? Should we submit patch to ML
> relating to linux?
> Thanks,
> --
> Yuji Shimada
> On Tue, 02 Dec 2008 08:35:27 +0000
> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:
>> How about using http://xenbits.xensource.com/ext/linux-2.6.27-xen.hg for
>> this sort of thing until pv_ops is readier?
>> linux-2.6.18-xen.hg would like a peaceful and stable old age. :-)
>>  -- Keir
>> On 2/12/08 06:25, "Yuji Shimada" <shimada-yxb@xxxxxxxxxxxxxxx> wrote:
>>> This series of patches add high MMIO area support to dom0 linux. They
>>> are useful when we reassign page-aligned memory resource to device or
>>> when we hot-add device.
>>> 1. Use _CRS for PCI resource allocation.
>>>    (most of codes are backported from 2.6.26).
>>> 2. Sort PCI resource based on priority of allocation.
>>> 3. Support 64 bit PREF base/limit.
>>> Someone might think backport is not good. But we have to use dom0
>>> linux based on 2.6.18 for the moment. I'd like them to accept my
>>> patches.
>>> Thanks,
>>> --
>>> Yuji Shimada

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