Xen users - Jun 2008 - simple question - amd64 dom0, and PVM i486 domU ?

I''ve been looking for a solution that doesn''t involve dual
booting, or
chrooting things to get my x86 domU to work.  I have a Debian xen
server on an amd64 platform.  It would seem that I should be able to
also install or force the install of a non-xen i486 kernel.  When I
recieved this server it had a manufacturer''s install of Etch with an
i486 kernel.  Once I have both kernels installed in dom0, can''t I just
boot the server off the xen-amd64 kernel, and build a para-virtualized
 debian domU, referencing the i486 kernel in /boot ?

Not sure the best way to go about it and any tips are appreciated!
Thanks,
Marshall

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rabbtux rabbtux wrote:
> I''ve been looking for a solution that doesn''t involve
dual booting, or
> chrooting things to get my x86 domU to work.  I have a Debian xen
> server on an amd64 platform.  It would seem that I should be able to
> also install or force the install of a non-xen i486 kernel.  When I
> recieved this server it had a manufacturer''s install of Etch with
an
> i486 kernel.  Once I have both kernels installed in dom0, can''t I
just
> boot the server off the xen-amd64 kernel, and build a para-virtualized
>  debian domU, referencing the i486 kernel in /boot ?
> 
> Not sure the best way to go about it and any tips are appreciated!
> Thanks,
> Marshall
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
To run a non-Xen kernel, you''ll need to run the VM under HVM.

--John

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rabbtux rabbtux wrote:
> I''ve been looking for a solution that doesn''t involve
dual booting, or
> chrooting things to get my x86 domU to work.  I have a Debian xen
> server on an amd64 platform.  It would seem that I should be able to
> also install or force the install of a non-xen i486 kernel.
Is there such a thing as i486?
> Once I have both kernels installed in dom0, can''t I just
> boot the server off the xen-amd64 kernel, and build a para-virtualized
>  debian domU, referencing the i486 kernel in /boot ?
>
>   
I''m not familiar with Debian Etch, but assuming that you want to create
a NEW PV-i386 domU on amd64 dom0, you''ll going to need Xen >= 3.1
(go
with 3.2.1, if possible), which supports 32bit PV domU on 64bit dom0.

In RH-based distros the convention is to put domU''s kernel on
domU''s
storage (not on dom0''s boot), so each domU boots from their own /boot 
(using pygrub). This way you''ll only need amd64-xen kernel on dom0 and 
i386-xen kernel on domU.

Regards,

Fajar


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Fajar A. Nugraha wrote:
> rabbtux rabbtux wrote:
>> I''ve been looking for a solution that doesn''t involve
dual booting, or
>> chrooting things to get my x86 domU to work.  I have a Debian xen
>> server on an amd64 platform.  It would seem that I should be able to
>> also install or force the install of a non-xen i486 kernel.
>
> Is there such a thing as i486?
>
Sorry about that. It seems that Debian DOES have i486 kernel. My mistake.
>> Once I have both kernels installed in dom0, can''t I just
>> boot the server off the xen-amd64 kernel, and build a para-virtualized
>>  debian domU, referencing the i486 kernel in /boot ?
>>
>>   
>
> I''m not familiar with Debian Etch, but assuming that you want to 
> create a NEW PV-i386 domU on amd64 dom0, you''ll going to need Xen
>=
> 3.1 (go with 3.2.1, if possible), which supports 32bit PV domU on 
> 64bit dom0.
>
> In RH-based distros the convention is to put domU''s kernel on
domU''s
> storage (not on dom0''s boot), so each domU boots from their own
/boot
> (using pygrub). This way you''ll only need amd64-xen kernel on dom0
and
> i386-xen kernel on domU.
>
32-on-64 PV will give best performance and compatibility.

Another option would be to use 64bit_kernel-32bit_userland scenario for 
domU. I''v been using this method on Xen 3.0, and works great most of
the
time. You might have problems with applications that interracts with 
kernel modules (like iptables) though.

It''s also possible to use HVM PV. This will allow you to use non-xen 
kernels, at the cost of performance penalty and special CPU requirement.

Regards,

Fajar


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Actually, let me re-phrase the question.  The server is now running
xen from ubuntu hardy heron.  so the kernel and version of xen are
recent.  What is the straight forward way to get my 32bit PVM running?

On Mon, Jun 16, 2008 at 7:16 PM, John T. Yocum <john@fluidhosting.com>
wrote:
> rabbtux rabbtux wrote:
>>
>> I''ve been looking for a solution that doesn''t involve
dual booting, or
>> chrooting things to get my x86 domU to work.  I have a Debian xen
>> server on an amd64 platform.  It would seem that I should be able to
>> also install or force the install of a non-xen i486 kernel.  When I
>> recieved this server it had a manufacturer''s install of Etch
with an
>> i486 kernel.  Once I have both kernels installed in dom0,
can''t I just
>> boot the server off the xen-amd64 kernel, and build a para-virtualized
>>  debian domU, referencing the i486 kernel in /boot ?
>>
>> Not sure the best way to go about it and any tips are appreciated!
>> Thanks,
>> Marshall
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@lists.xensource.com
>> http://lists.xensource.com/xen-users
>
> To run a non-Xen kernel, you''ll need to run the VM under HVM.
>
> --John
>
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Do you want a PVM or HVM?  You can''t run a non-Xen kernel in a PVM -
PVM by definition requires a Xen kernel.  If you want to run a non-Xen, i486
kernel you''ll have to use full virtualization - HVM.
 
-Nick
>>> On 2008/06/16 at 20:46, "rabbtux rabbtux"
<rabbtux@gmail.com> wrote:
Actually, let me re-phrase the question.  The server is now running
xen from ubuntu hardy heron.  so the kernel and version of xen are
recent.  What is the straight forward way to get my 32bit PVM running?

On Mon, Jun 16, 2008 at 7:16 PM, John T. Yocum <john@fluidhosting.com>
wrote:
> rabbtux rabbtux wrote:
>>
>> I''ve been looking for a solution that doesn''t involve
dual booting, or
>> chrooting things to get my x86 domU to work.  I have a Debian xen
>> server on an amd64 platform.  It would seem that I should be able to
>> also install or force the install of a non-xen i486 kernel.  When I
>> recieved this server it had a manufacturer''s install of Etch
with an
>> i486 kernel.  Once I have both kernels installed in dom0,
can''t I just
>> boot the server off the xen-amd64 kernel, and build a para-virtualized
>>  debian domU, referencing the i486 kernel in /boot ?
>>
>> Not sure the best way to go about it and any tips are appreciated!
>> Thanks,
>> Marshall
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@lists.xensource.com 
>> http://lists.xensource.com/xen-users 
>
> To run a non-Xen kernel, you''ll need to run the VM under HVM.
>
> --John
>



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rabbtux rabbtux wrote:
> Actually, let me re-phrase the question.  The server is now running
> xen from ubuntu hardy heron.  so the kernel and version of xen are
> recent.  What is the straight forward way to get my 32bit PVM running?
> 
> On Mon, Jun 16, 2008 at 7:16 PM, John T. Yocum
<john@fluidhosting.com> wrote:
>> rabbtux rabbtux wrote:
>>> I''ve been looking for a solution that doesn''t
involve dual booting, or
>>> chrooting things to get my x86 domU to work.  I have a Debian xen
>>> server on an amd64 platform.  It would seem that I should be able
to
>>> also install or force the install of a non-xen i486 kernel.  When I
>>> recieved this server it had a manufacturer''s install of
Etch with an
>>> i486 kernel.  Once I have both kernels installed in dom0,
can''t I just
>>> boot the server off the xen-amd64 kernel, and build a
para-virtualized
>>>  debian domU, referencing the i486 kernel in /boot ?
>>>
>>> Not sure the best way to go about it and any tips are appreciated!
>>> Thanks,
>>> Marshall
>>>
>>> _______________________________________________
>>> Xen-users mailing list
>>> Xen-users@lists.xensource.com
>>> http://lists.xensource.com/xen-users
>> To run a non-Xen kernel, you''ll need to run the VM under HVM.
>>
>> --John
>>
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
Simply install a 32bit Xen kernel on the PVM.

--John

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rabbtux rabbtux wrote:
> I want a PVM for my 32bit domU.  Don''t I have to refer to a
xen-kernel
> in the domU.cfg file that is on the dom0 filesystem?  Or are those
> lines no longer required in the newer xen, just the kernel inside the
> domU?
> 
> On Mon, Jun 16, 2008 at 7:56 PM, John T. Yocum
<john@fluidhosting.com> wrote:
>> rabbtux rabbtux wrote:
>>> Actually, let me re-phrase the question.  The server is now running
>>> xen from ubuntu hardy heron.  so the kernel and version of xen are
>>> recent.  What is the straight forward way to get my 32bit PVM
running?
>>>
>>> On Mon, Jun 16, 2008 at 7:16 PM, John T. Yocum
<john@fluidhosting.com>
>>> wrote:
>>>> rabbtux rabbtux wrote:
>>>>> I''ve been looking for a solution that
doesn''t involve dual booting, or
>>>>> chrooting things to get my x86 domU to work.  I have a
Debian xen
>>>>> server on an amd64 platform.  It would seem that I should
be able to
>>>>> also install or force the install of a non-xen i486 kernel.
When I
>>>>> recieved this server it had a manufacturer''s
install of Etch with an
>>>>> i486 kernel.  Once I have both kernels installed in dom0,
can''t I just
>>>>> boot the server off the xen-amd64 kernel, and build a
para-virtualized
>>>>>  debian domU, referencing the i486 kernel in /boot ?
>>>>>
>>>>> Not sure the best way to go about it and any tips are
appreciated!
>>>>> Thanks,
>>>>> Marshall
>>>>>
>>>>> _______________________________________________
>>>>> Xen-users mailing list
>>>>> Xen-users@lists.xensource.com
>>>>> http://lists.xensource.com/xen-users
>>>> To run a non-Xen kernel, you''ll need to run the VM
under HVM.
>>>>
>>>> --John
>>>>
>>> _______________________________________________
>>> Xen-users mailing list
>>> Xen-users@lists.xensource.com
>>> http://lists.xensource.com/xen-users
>> Simply install a 32bit Xen kernel on the PVM.
>>
>> --John
>>
The kernel can either be inside dom0, or in the domU. Either is acceptable.

--John

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