On Fri, Jun 08, 2007 at 05:38:33PM +0100, Mark Williamson wrote:
> > > That said, in principle it ought to be alright. 32-on-64 even fully
> > > supports glibc's TLS, which even 32-on-32 doesn't (this is because of
> > > slightly arcane implementation details in x86. Really. The mind
> > > boggles.).
> >
> > I won't ask as I don't need my brain exploded on Friday afternoon ;-)
>
> Well, it's really very simple. Basically what happens is *bang* *bang*
> *splat*[1]
>
> OK, maybe you were right :-)
>
> > > If you're running a 64-bit Xen, I think you also have the potential to
> > > run 64-bit paravirt guests, and 64-bit HVM guests in addition to all the
> > > stuff you could run on 32-bit Xen.
> >
> > Yes that is certainly of future interest.
> >
> > > At some point it should be possible to run a 32-bit dom0, but I'm not
> > > sure if that's allowed yet.
> >
> > Well that is how I tested it so I guess it is possible ;-)
>
> Well, more particularly, I don't know if a 32-bit dom0 will boot 64-bit
> guests, which may or may not matter for you. I think it's on the roadmap.
Pretty sure it will. Back before 3.1.0 was released I was running 32-bit
Dom0 with 64-bit HV. IIRC I booted a 64-bit guest too. The only dep between
dom0 and guest is the front/back drivers & they're now 64-bit invariant
so AFAICT it shouldn't matter whether Dom0 is 32 or 64-bit wrt to guests,
as long as the HV is 64-bit.
Dan.
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