Xen users - Oct 2007 - xen 3.1 failing: qemu-dm error "map shared IO page returned error 22" centos 5, 64bit

Hello;

I can''t start a VM on this setup. It looks like
qemu dies. The message "map shared IO page returned error 22"
is the last line in the qemu-dm-NNN.log
(which is then defunc).

I''m using xen 3.1 on Centos 5,
binary distributed kernel, 64 bit mode,
''2.6.18-xen'',
IBM bladecenter.

Something from "xm dmesg" (which does not
otherwise contain errors or info on my problem):
(XEN) *** LOADING DOMAIN 0 ***
(XEN)  Xen  kernel: 64-bit, lsb, compat32
(XEN)  Dom0 kernel: 64-bit, lsb, paddr 0xffffffff80200000 ->
0xffffffff805b0e6c
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN)  Dom0 alloc.:   000000007d000000->000000007e000000 (477266 pages
to be allocated)

Anyway, I cannot start any VM. Now I *have* been looking
around for this error message but the only web pages I find contain
the source code of Xen (and of course the literal error message
apart from the number ''22'').
Well that doesnt really help me and I do not know enough
of Xen - let alone memory allocation [failure] - to continue
searching.

Any help & tips would be welcome. Oh and I did try some
pae/apic etc. settings but I don''t think that is the problem.

Klaas




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