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vSphere High Performance Essentials by Christian Stankowic

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Memory mapping and utilization

Like all modern operating systems, ESXi utilizes memory virtualization in order to provide a virtual address range of coherent memory resources. These resources are allocated on per-VM basis; to enhance security, these resources are protected between particular VMs. If the physical memory pages were allocated for a VM and are scheduled for allocation for another VM, the pages are zeroed first. If memory virtualization is enabled, the MMU integrated in the CPU will synchronize the shadow page tables to enhance the speed and avoid hypervisor overhead.

Memory mapping and utilization

To translate guest physical memory into hypervisor physical memory ...

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