Re: [Xen-devel] [RFC][PATCH]mini-os: big-endian mini-os on ia64

[Grzegorz Milos <gm281@xxxxxxxxx>]

> > What I want to have is a mini-os, where everybody whith ia64 hardware can
> > build and run a BE mini-os beside LE mini-os (or other domU's) on xen-ia64
> > hypervisor. If you say at this point: no interrest for such a thing, than we
> > can stop this discussion here.
> I don;t think we'd have a problem with incorportaing support for ia64-be if
> there's a good reason for it (a better reason than "because it's possible").
>
> > The other way would be building wrappers around all the accesses to
> > domU/hypervisor interfaces and hide the SWAPs there. But this seems a little
> > bit overkill at this stage.
> It would be less ugly and I think less prone to missing some open-coded
> accesses. Open-coding the SWAP()s is pretty grim.
One solution to the rotting problem would be write regression tests. 
High level tests (like for example netfront test) would be quite good at 
picking missing SWAPs, since they exercise a fair amount of Xen/Dom0 
interfaces. Still it's quite hard to check the coverage (anybody happens 
to be an expert on coverage testing?).
I too dislike scattering SWAPs all over the code, but I guess having a 
nice set of wrappers would at least confine the problem. Still ... not 
that fond of it.
Cheers
Gregor


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