I've tracked down this problem to upstart.

With xen-3.0.4, I have a lot of kernel messages like this :
"4gb seg fixup, process init (pid 1), cs:ip 73:08051546"
"4gb seg fixup, process logd (pid 2429), cs:ip 73:0804b0da"

The only processes generating such warnings are init and logd, both of
which come from the upstart package.

By recompiling upstart with CFLAGS="-mno-tls-direct-seg-ref" those messages 
disapeared.
I don't know if it is the proper way of fixing this, but it WorksForMe(tm)

I attach a debdiff against upstart 0.3.1-1 (from Feisty)
The packages are available in my "Xen 3.0.4 for Feisty" repository :
deb http://cedric.gabriello.fr/ubuntu feisty xen
deb-src http://cedric.gabriello.fr/ubuntu feisty xen


** Attachment added: "upstart debdiff"
   http://librarian.launchpad.net/6387494/upstart_0.3.1-1sdrik1.debdiff

** Changed in: initramfs-tools (Ubuntu)
Sourcepackagename: initramfs-tools => upstart
       Status: Unconfirmed => Confirmed

-- 
mkinitramfs does not bulid a xen-friendly initrd
https://launchpad.net/bugs/77972

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