In this proposal, we extended N extension and applied it to H extension for improving the performance of virtual I/O devices in the virtualization scenario. We proposed a new mechanism to delegate exceptions from VS-mode/VU-mode
to U-mode. A solution is also implemented based on QEMU simulator and KVM virtualization architecture. Evaluation results show that our proposal achieves nearly 2x faster synchronous I/O processing speed than the orginal system.
The attachment is the detailed proposal. Any comments are welcome.
