Real-time performance is strongly required in the areas such as high performance computing, control systems, or trading systems. In addition, benefits of virtualization are also desired for consolidation, easy deployment, and so on. In this presentation, a new method is introduced to improve real-time performance by dedicating some CPUs to KVM guests. To realize bare-metal response and stability, we propose a mechanism to directly route interrupts from PCI devices directly to KVM guests.This presentation is for developers who are interested in the implementation of KVM.