windows in domU on etch. where is the showstopper?

Since some days I'm trying to install windows into a domU just for fun. All went fine until accessing discs. Sometime partition is not formatable, sometimes files could not read from cdrom. To be sure, it's not the disc image, I used a fresh one from a MSDN Subscription, but it didn't help.

Searching around on web, I found that I'm not the only one, with this issue. The common(s) seems to be etch (and AMD CPU).

I found traces of the issue at SP Team Blog, xen-users and xen-forum (german).

Maybe anybody can enlighten me?