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[Xen-users] Re: 64 Bit Dom0 and 32Bit DomU

Mark Williamson schrieb:
> On Tuesday 20 May 2008, Jens Kleikamp wrote:
>>> If you've upgraded Xen make sure you have properly uninstalled the old
>>> tools and installed the new ones to match your Xen.
>>> nb. to actually use 32-on-64 you also need a sufficiently new dom0 kernel
>>> that supports this feature.
>>> Cheers,
>>> Mark
>> Hello,
>> I am hanging also on this issue, I want to a boot 32bit debian domu on
>> my 64bit host with XEN 3.2.1.
>> The 32bit debian 4.0 boots fine with my default 64bit domU kernel. This
>> makes me really wonder.
>> But with a 64bit kernel the 32bit domU is not that usable as I thought.
>> For example, openpkg and probably other software looks what kernel is
>> running and then thinks its on a 64bit system.
> OK.  32-bit distros can often boot on a 64-bit kernel due to the binary 
> compatibility provided.  Your package manager's confusion can probably be 
> fixed but there are other things which may still break.
>> Now I am trying to figure out a new kernel-config to make this work.
>> Maybe you can give some tips what changes to the kernel configs are needed.
> On 3.2.1 you should be able to boot a 32-bit Xenified kernel instead of the 
> 64-bit one and have it Just Work(TM).  Have you tried this?  Were there 
> problems?  The 32-bit kernel needs to support PAE (CONFIG_HIGHMEM_64G) in 
> order to run on 64-bit Xen.
> I'm not sure if suspend/resume/migration will work for that setup but just 
> running the domain paravirtualised ought to be OK.
> Cheers,
> Mark

I build my 32bit xen-dumU Kernel with CONFIG_HIGHMEM_64G set and all is
fine. Thank you very much!


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