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The needs for immediate responsiveness of VMs in the virtualized environments have been on the rise. Several services in SKT also require soft realtime support for virtual machines to substitute the physical machines to achieve high utilization and adaptability. However, consolidated multiple OSes and irregular external events might render the hypervisor infringe on a VM's promptitude. As a solution of this problem, we are improving Xen's credit scheduler by introducing the RT_PRIORITY that guarantees a VM's running at any given point in time as long as credits remains to be burn. It would increase the quality of service and make a VM's behavior predictable on the consolidated environment. In addition, we extend our suggestion to the multi-core environment and even a large number of physical machines by using live migrations.