/n/sources/xen/xen3 is now updated (source and pre-built kernels) to be compatible with Xen 3.2 - tested (thanks to Alex and Andreas) with:
Xen 3.2.1 (debian package xen-linux-system-2.6.26-2-xen-686) XenServer 5.5 It also still boots on Xen 3.0.2. I have to retract my remarks about Xen API churn: this time it was only necessary to massage the ELF boot file format, and compensate for one typo in Xen's 3.2 include headers; no kernel logic changes were needed. There may be lots of new API we aren't using, but it appears our legacy approach is still supported.