![]() This accelerates your guest's performance comparable to near-native. Nested paging is a modern CPU feature that eliminate this double paging and computes correct address directly in the CPU. This leads to poor performance because hypervisor has to translate the guest's paging into host's paging address then host maps to physical address. Now the same applies to virtualized guests which also has their own paging. So operating system keeps a map of this physical and logical addresses to correctly send instructions to the processor. Physically page 0 can be present in any address in the main memory. OS will now load the Firefox executable into these pages starting at page 0. See Section 3.14, Alternative Firmware (EFI) Enables Secure Boot, to provide a secure environment for starting the guest OS. Main memory is usually divided into equal blocks called (maybe non-continuous) pages. Configuring Virtual Machines Enables Extensible Firmware Interface (EFI), which replaces the legacy BIOS and may be useful for certain advanced use cases. Let's say you wish to run Firefox to browse cat pics, your operating system has to pull the Firefox binary into main memory. Paging is a memory layout concept in operating systems. VirtualBox VM setup: 4 CPU, 4096 MB Memory, network adapter disabled, Hard Disk - SSD, Paravirtualization Interface Default, Hardware Virtualization - Enable Nested Paging, Executing Engine - VT-x/AMD-V, Paravirtualization Interface - Hyper-V. For example, VirtualBox provides virtio network interface which entirely eliminates emulating network cards in the software given the guest can make use of the interface. Paravirtualization means that the guest is aware of the virtualized environment and utilizes certain APIs provided by host and hypervisor to improve performance. ![]()
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