TwinDrivers: semi-automatic derivation of fast and safe hypervisor network drivers from guest OS drivers

In a virtualized environment, device drivers are often run inside a virtual machine (VM) rather than in the hypervisor, for reasons of safety and reduction in software engineering effort. Unfortunately, this approach results in poor performance for I/O-intensive devices such as network cards. The alternative approach of running device drivers directly in the hypervisor yields better performance, but results in the loss of safety guarantees for the hypervisor and incurs additional software engineering costs. In this paper we present TwinDrivers, a framework which allows us to semi-automatically create safe and efficient hypervisor drivers from guest OS drivers. The hypervisor driver runs directly in the hypervisor, but its data resides completely in the driver VM address space. A Software Virtual Memory mechanism allows the driver to access its VM data efficiently from the hypervisor running in any guest context, and also protects the hypervisor from invalid memory accesses from the dr...

• Type: Conference
• Year: 2009
• Where: ASPLOS
• Authors: Aravind Menon, Simon Schubert, Willy Zwaenepoel
• Keywords: ASPLOS 2009, Efficient Hypervisor Drivers, Hypervisor Yields, Programming Languages, TwinDrivers Hypervisor Driver