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Cloud stacks must isolate microservices, while permitting efficient data sharing between isolated services deployed on the same physical host. Traditionally, the MMU enforces isolation and permits sharing at a page granularity. MMU approaches, however, lead to cloud stacks with large TCBs in kernel space, and the page granularity requires inefficient OS interfaces for data sharing. Forthcoming CPUs with hardware support for memory capabilities offer new opportunities to implement isolation andarXiv:2202.05732v1 fatcat:cwxrqi7ma5bb5eokwpcpscz4vy