Bugzilla Bug 124355

Xen by default is not build with PAE capabilities.  The Xen README gives
details on how to build Xen to support PAE for machines with >4GiB of memory.

I don't have a PAE-ised >4gb system; if you can supply a tested patch for the
ebuild I'll add it.

We should also force the xen-sources dom0 and guest kernels to compile with
PAE.  Dom0 and xen must match, and I don't think that xen yet supports non-PAE
kernels in PAE xen.  It doesn't work for me.

Created an attachment (id=80957) [edit]
xen-3.0.1-r1.patch

Created an attachment (id=80958) [edit]
gentoo-make.patch

"pae" should probably be a global USE flag, since it affects both of the xen
packages, huh?

I've added pae support. The pae flag is only on xen - a warning is shown that
it will only boot pae kernels. There's really no way to force the user to build
a pae kernel, we just assume that they know what they're doing. Also global use
flags only get added when at least 5 packages are already using them.

I dropped your patch - maintaining a patch is more hassle than the 2 lines of
the ebuild it saves.

Thanks for your contribution!

Unless their Makefile changed (I haven't synched with portage yet), your
changes won't work.  I modified the Makefile because XEN_TARGET_X86_PAE=y is
actually refenced in the root Makefile, not the ones in the subdirectories.  It
sets the variable pae=y, and the other Makefiles use that.

Ok, it should be fixed now.

Looks like the ebuild for p9029 got goofed up for PAE.

I don't see any changes that would affect PAE?

I had to change the opts XEN_blah=y back to pae=y.

(In reply to comment #11)
> I had to change the opts XEN_blah=y back to pae=y.

Could you explain more?  The only difference between the 9029-r2.ebuild and the
3.0.1_p9029.ebuild wrt pae is that the former used

        if use pae; then
                myopt="${myopt} XEN_TARGET_X86_PAE=y"
        fi

and the latter uses

        use pae && myopt="${myopt} XEN_TARGET_X86_PAE=y"

These should be functionally equivalent, so what's the issue again?

The main Makefile isn't used.  It sets pae=y based on XEN_TARGET_X86_PAE. 
Without pae=y during the compile, it can't link successfully.  See me post at
2006-03-02 09:34 PST.

Should be fixed in 3.0.2. I just set pae=y in the ebuild... it seems to compile
okay and it's using the PAE flags, so hopefully nothing else changed.