[Xen-users] HVM DomU with Kernel 2.6.27-19 on CentOS 5 hangs with 100% CPU at Linux bootup on Xen 3.2.1

[Martin Troester <MartinTroester@xxxxxx>]

Dear Xen Community,

today we tried to upgrade our base server from a Xeon E5430 to a Xeon 
X5570 (Nehalem). This worked fine so far, but our DomUs with Kernel 
2.6.27 no longer boot - they start up until the following message appears:
[..]
Mount-cache hash table entries: 256
Initializing cgroup subsys ns
Initializing cgroup subsys cpuacct
Initializing cgroup subsys memory
Initializing cgroup subsys devices
Initializing cgroup subsys freezer

Afterwards, the CPU utilization in xm top/xm list shows one VCPU 
assigned to that VM, even if more have been specified in the config 
file. This VCPU is 100% busy - so it appears to be caught in some kind 
of a loop?
As only one VCPU is shown at this point, it appears to be early during 
bootup, not all VCPUs have been detected and assigned to that VM.
As the very same image runs without problems with the same Dom0 and DomU 
config on the "old" Xeon, and other DomUs still run on the new setup, 
this seems to be related to this kernel version.
Any help to debug deeper into this are highly appreciated.

Thanks!
Martin

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