[CentOS] Panic / EL6 / KVM / kernel-2.6.32-754.2.1.el6.x86_64

Since the update from kernel-2.6.32-754.2.1.el6.x86_64 
to kernel-2.6.32-754.3.5.el6.x86_64 I can not boot my 
KVM guests anymore!? The workstation panics immediately! 

I would not have expected this behavior now (last phase of OS). 
It was very robust until now (Optiplex Workstation). I see some KVM 
related lines in the changelog.diff. Before swimming upstream:

Does some one have problems related to KVM with kernel-2.6.32-754.3.5.el6.x86_64 ??

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LF