On Sat, Mar 27, 2010 at 08:53:02PM -0500, W. Michael Petullo wrote:
> I am trying trying to run a research OS named Ethos as a DomU
> paravirtualized guest. Ethos does not yet support 64-bit or PAE, so I
> need to build a non-PAE Dom0 kernel. I am having trouble doing this. Here
> is what I tried:
> 1. Edit Michael Young's kernel.spec as follows:
> # kernel-PAE is only built on i686.
> %ifarch i686
> %define with_pae 0
> %define with_up 1
> %else
> %define with_pae 0
> %endif
> 2. Build an RPM using "rpmbuild -ba --target i686 --with xen --without
> debuginfo kernel.spec."
> When try to boot my Dom0 kernel, Xen complains:
> (XEN) elf_xen_note_check: ERROR: Will only load images build for the
> generic loader or Linux images
> Do I need to recompile Xen to go non-PAE?
> See also https://bugzilla.redhat.com/show_bug.cgi?id=543190, unable to
> build custom i686 non-pae kernel.

Xen doesn't support non-PAE PV guests anymore.
I think Xen 3.2 was the last release to support non-PAE 32bit Paravirt guests.

Xen 3.4 and 4.0 definitely require 32bit PV guests to be PAE.

Xen HVM guests can be non-PAE.

-- Pasi

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