Re: Xen, PAE, and NetBSD

["Todd Vierling" <tv%pobox.com@localhost>]

On 2/12/07, Matthias Scheler <tron%zhadum.org.uk@localhost> wrote:
> > Runs fine on a PAE mode 32-bit Linux host that you do not have the
> > option to reconfigure?
>
> Out of technical curiosity:
> Why does a domU have to support PAE? AFAIK the page table is managed by
> the Hypervisor. Is the interface to the Hypervisor so badly designed
> that it can't hide such details?

See messages in mail-index:port-xen for August 2006, with the subject

   Xen3/PAE problems with domainU

There are some web link pointers to xen-users in that thread.  What I
gathered from it without digging for major technical details is that
the page tables are manipulated in a native-like format in all
domains, so their structural layout must match in all domains (PAE vs.
non-PAE).

> From a user's perspective, if you try to load a non-PAE-capable domU
on a PAE host, xend will spit out EINVAL and refuse to complete the
domain construction.

--
-- Todd Vierling <tv%duh.org@localhost> <tv%pobox.com@localhost> 
<todd%vierling.name@localhost>