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RE: [Xen-ia64-devel] PLEASE REPLY and RE: [PATCH] Patch for loading modu

To: "Matt Chapman" <matthewc@xxxxxxxxxxxxxxx>, "Magenheimer, Dan \(HP Labs Fort Collins\)" <dan.magenheimer@xxxxxx>
Subject: RE: [Xen-ia64-devel] PLEASE REPLY and RE: [PATCH] Patch for loading module[2of2]
From: "Yang, Fred" <fred.yang@xxxxxxxxx>
Date: Tue, 6 Sep 2005 21:15:18 -0700
Cc: Brett Johnson <brettj@xxxxxxxxxxxxxxxxxxxxx>, xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
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Thread-topic: [Xen-ia64-devel] PLEASE REPLY and RE: [PATCH] Patch for loading module[2of2]
"vmm=" is better, though we were think "vmmodule" which is not clean
So it will be "vmm="

Matt Chapman wrote:
> I like "hypervisor=" or "hvimage=", or how about about "vmm=" or
> "preload=" if you don't want to use the word hypervisor ?  This
> functionality will be useful for other hypervisors too (such as
> vNUMA), so I'd rather not call it "xenimage"...
> Matt
> On Tue, Sep 06, 2005 at 10:24:58AM -0700, Magenheimer, Dan (HP Labs
> Fort Collins) wrote: 
>> I just talked to Brett Johnson, the maintainer for elilo.
>> My suggestion of having initrd= and module= be synonyms
>> doesn't work well with the elilo parser.  However,
>> he prefers a solution that AFAIK has not yet been proposed:
>> - Leave image= for the Linux kernel image.
>> - Leave initrd= for the Linux kernel's initrd
>> - Add a NEW keyword, xenimage=, to specify the xen binary.
>> He says that the module= proposal is already Xen-specific;
>> he doesn't see any other uses for it on the horizon.  The
>> term "module" is also very vague and doesn't describe what
>> it is being used for.  So, he says, why not just be explicit
>> that we are booting Xen and leave the image= and initrd=
>> keywords with the same Linux meaning.  Thus:
>> label=xen
>>   xenimage=xen
>>   image=xenlinux
>>   initrd=initrd.img
>> (and if we don't want to explicitly encode the term "Xen"
>> in the keyword, we could use "hvimage=" or "hv=" or "hypervisor="**
>> instead.) 
>> Brett's solution seems the best to me.  It will also
>> work quite nicely for a transparently paravirtualized
>> system: If xenimage= is specified but the file is not
>> found, just load and boot image= which will boot normal Linux.
>> Comments?
>> On a related note:  Anthony, Brett said that he would much
>> prefer to see a patch against elilo v3.5-pre1 as there are
>> additional bug fixes in that base.
>> Dan
>> ** probably don't want to use "hypervisor=" since the
>> word has been trademarked by a certain big blue company :-)
>>> -----Original Message-----
>>> From: Yang, Fred [mailto:fred.yang@xxxxxxxxx]
>>> Sent: Tuesday, September 06, 2005 10:45 AM
>>> To: Magenheimer, Dan (HP Labs Fort Collins); Xu, Anthony
>>> Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>>> Subject: RE: [Xen-ia64-devel] PLEASE REPLY and RE: [PATCH]
>>> Patch for loading module[2of2]
>>> Backward compability issue is only happened on "deployed"
>>> product, not the "in development" project as xen/ia64. Why need so
>>> much "options"? 
>>> Magenheimer, Dan (HP Labs Fort Collins) wrote:
>>>> Well, so far the community is overwhelmingly in favor of B...
>>>> Which is OK with me.  I've come around to being OK with this
>>>> after thinking on it overnight.  I was uncomfortable with
>>>> losing the backward compatibility, but if this is going
>>>> to happen, now is the best time to do that while Xen/ia64 has few
>>>> users. 
>>>> One other thought I had overnight though:
>>>> Both the domain0 image and the initrd image could be
>>>> considered parameters to Xen.  So suppose that "initrd="
>>>> and "module=" are simply aliases for each other and the
>>>> first two files specified as either module or initrd
>>>> are passed (in order) as parameters to Xen.  This would
>>>> not only be backwards-compatible with existing Xen elilo.conf
>>>> files, but would be more compatible with grub.  So
>>>> all of the following do the right thing:
>>>> # choice A
>>>> image=xen
>>>> initrd=xenlinux # backward compatible
>>>> #no initrd
>>>> # choice B
>>>> image=xen
>>>> module=xenlinux
>>>> initrd=initrd.img
>>>> # grub and Xen/x86 compatible
>>>> image=xen
>>>> module=xenlinux
>>>> #no initrd
>>>> # grub and Xen/x86 compatible and probably
>>>> # the best to document for Xen/ia64?
>>>> image=xen
>>>> module=xenlinux
>>>> module=initrd.img
>>>> What do you think?
>>>>> -----Original Message-----
>>>>> From: Xu, Anthony [mailto:anthony.xu@xxxxxxxxx]
>>>>> Sent: Monday, September 05, 2005 10:19 PM
>>>>> To: Magenheimer, Dan (HP Labs Fort Collins); Yang, Fred
>>>>> Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>>>>> Subject: RE: [PATCH] Patch for loading module[2of2]
>>>>>>> Elilo is a gerernal OS loader,it doesn't and doesn't need to
>>>>>>> know presence of domain0, For elilo, xen.gz is a OS kernel,
>>>>>>> initrd= it's Os's initial ramdisk, module= is Os's parameter,
>>>>>>> we should keep all this meaning, we shouldn't make elilo
>>>>>>> special just for xen.
>>>>>> Yes, module= is OS's parameter, but domain0 is not
>>>>>> really a parameter.
>>>>> From the view of Elilo, xen is an OS, domain0 is a parameter to
>>>>> xen. As far as how to handle this parameter, it's up to xen.
>> _______________________________________________
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