[ACS 4.2 with KVM 6.2]System VM's are failed to start with 'LibvirtException: internal error unknown timer name 'kvmclock'

[Sailaja Mada]

Hi,

I have RHEL 6.2 KVM host with libvirt (0.9.4-23.el6). This is added to 4.2 
Cloudstack Management server.

With this KVM host, system VM's are failed to start with error as:

2013-07-11 14:22:45,946 WARN  [kvm.resource.LibvirtComputingResource] 
(agentRequest-Handler-1:null) LibvirtException
org.libvirt.LibvirtException: internal error unknown timer name 'kvmclock'
        at org.libvirt.ErrorHandler.processError(Unknown Source)
        at org.libvirt.Connect.processError(Unknown Source)
        at org.libvirt.Connect.domainCreateXML(Unknown Source)
        at 
com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.startVM(LibvirtComputingResource.java:1126)
        at 
com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.execute(LibvirtComputingResource.java:3293)
        at 
com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.executeRequest(LibvirtComputingResource.java:1222)
        at com.cloud.agent.Agent.processRequest(Agent.java:525)
        at com.cloud.agent.Agent$AgentRequestHandler.doTask(Agent.java:852)
        at com.cloud.utils.nio.Task.run(Task.java:83)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:679)


ASF Dev list there is a suggestion to upgrade Libvirt version to 1.0.2 to 
resolve this issue.  I am getting into lot of dependency failures to upgrade 
the libvirt version.

Has any one tried this  workaround?  Will it cause for any issues to existing 
environments(4.x /3.0.x with KVM 6.2) after upgrade to 4.2 ?

Thanks,
Sailaja.M