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xen-users
Re: [Xen-users] about migration betweendifferents architecture
> > > I always thought that on a x86-64-system only 64 bit-domU's will work
> > > and on i386 only 32 bit. Is this not true anymore?
> >
> > Right now it's still true.
>
> i think the mantra is something like "the memory model of a paravirtualized
> kernel must match that of the hypervisor"
Yes, for now.
There are plans to relax this a bit at some stage, but it'll require
additional support in the system for translating between different memory
layouts / hypercall tables.
> > So, folks, no migrating between 64 and 32 bit architectures. It's
> > naughty,
> >
> > yall hear? ;-)
>
> in this particular case, it might be a solution to just use the x86-64 in
> totally 32 bit mode, with 32bit xen hypervisor. would that work?
It'll work if the processors are reasonably compatible...
E.g. between a 32-bit Athlon and an Opteron in 32-bit mode...
If one of the CPUs has instructions the other doesn't it'll be a problem.
E.g. if 3dnow instructions are being used by the domain and you migrate it to
an Intel system, you'll get breakages.
Cheers,
Mark
--
Dave: Just a question. What use is a unicyle with no seat? And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!
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