Seems like this is a regression bug in the kernel:
I installed linux-{image,ubuntu-modules}-2.6.24-28-xen from Ubuntu 8.04 and
cpufreq=dom0-kernel worked exactly as expected (i.e. the Dom0 kernel does
cpufreq scaling in exactly the same way it would if it were running natively).
I also tried linux-{image,modules}-2.6.26-2-xen-amd64 from Debian Lenny, but
unfortunately that one lacks the cpufreq modules.
Apparently, the bug was introduced somewhere between 2.6.25 and 2.6.31:
http://lists.xensource.com/archives/html/xen-devel/2010-02/msg00354.html
Which other kernel versions should I test to help narrow this down?
> > The cpufreq=dom0-kernel option is what I am actually interested in
> > because cpufreq=xen is not supported on older AMD CPUs. However, I
> > have not been able to actually get it to work yet.
>
> OK, I'm reopening the bug, but I'm afraid I'm not likely to spend time
> investigating it.
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