Re: [Xen-users] baremetal to PV troubles (32/64 bit PV hybrid)

[jonr@xxxxxxxxxx]

And mine! Thanks Tom.

Jon

Quoting Dylan Martin <dmartin@xxxxxxxxxxxx>:

> Thanks!  That answers all my questions!
>
> > On Thu, 12 Jul 2007, Dylan Martin wrote:
> >
> > >Thanks for answering!  I have loads more questions...
> > >
> > >Okay, I think I understand.  I'd use the 64 bit kernel & modules but
> > >the 32 bit libs, right?
> > >
> > >How does the 64 bit kernel know the userland is 32 bit?  Won't it try
> > >and find the 64 bit libs and freak out?
> >
> > AFAIK, kernels don't find libraries... userspace programs do. The 64 bit
> > kernels provide all the 32 bit system calls (as long as the default option
> > to do that wasn't turned off when the kernel was built).
> >
> > >Does it use memory like a 64 bit machine?
> >
> > yes, raw memory allocation is a kernel thing.
> >
> > >Is there any reason to run a 32 bit domU in a 64 bit dom0?
> >
> > yes/no. 32 bit code is generally in more common use and better tested. If
> > you're using precompiled binaries you might not even have an option of
> > running 64 bit code. Or you might simply have a 32 bit install on a
> > physical machine that you want to move to a paravirt on a big machine
> > without rebuilding from scratch and consequently breaking things.
> >
> > The one gotcha you will run into with the 32/64 bit hybrid is that some
> > kernel related tools can get upset (iptables being an example, the
> > simplest solution is to build a statically linked binary on a 64 bit
> > machine and copy that across to your 32 bit userspace domU)
> >
> > -Tom
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