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This version adds a re-architected XL toolstack that is functionally nearly equivalent to XM/XEND, a prototype credit2 scheduler designed for latency-sensitive workloads and very large systems, CPU Pools for advanced partitioning, support for large systems (>255 processors and 1GB/2MB super page support), support for x86 Advanced Vector eXtension (AVX), and a new Memory Access API enabling integration of third party security solutions into Xen virtualized environments.