Towards Assurance of Availability in Virtualized Cloud System

Cloud computing naturally shares physical resources, which is provided by virtualization technology. In contrast to the strength of virtualization, the serious security concerns raises due to the complexity of virtualization. It will place obstacles on the road to spread of cloud computing. In order to resolve the concern, many researchers focus on guaranteeing confidentiality and integrity of virtual machines except availability. We can support SLA (Service Level Agreement) as a part of assuring availability of virtual machines by SMM (System Management Mode)- based mechanism. Even if hypervisor is compromised, the mechanism can detect violations of SLA in virtualized cloud system.