[RFC] First (incomplete) cut of Xen paravirt binding

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Rusty Russell <rusty at rustcorp.com.au> writes:

> On Mon, 2006-07-31 at 08:45 -0600, Eric W. Biederman wrote:
>> I have a fundamental problem with this patch.
>> Don't we enter the kernel at:
>> arch/i386/boot/compressed/head.S startup_32?
>> Doesn't %ebx get stomped?
>> 
>> Otherwise I think the concept is fine, the implementation just
>> won't work.
>
> If you want to boot compressed kernels, yes.

I think we do.  It would certainly simplify everyones life if
we can.  I think booting compressed kernels is a natural outgrowth
of having a generic kernel that can boot on everything.

>> Well I can tell to some extent it doesn't work as you got the
>> x86 calling conventions wrong.
>
> Well, the init function pointer is labelled "fastcall", but as the code
> is untested I can easily believe I screwed up in at least one place.

Ok.  I didn't think I saw that.  I was looking for asmlinkage though :)

> Since the Xen people seem happy to revise their boot procedure, I'm
> going to drop mu proposal and let you, Zach and Jeremy sort it out from
> scratch.

Sounds like a plan.

> I want a single entry point, and I want a new hypervisor ABI
> implementation to merely have to add a new paravirt ops.  Meet those,
> and I'm happy...

Sounds like a good criteria.

Eric


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