Prominent features of VirtualBox 5.1 include the implementation of a new NVMHCI (Non-Volatile Memory Host Controller Interface Specification) storage controller for emulating NVMe (NVM Express) devices, better USB support, multi-channel audio support, improved overall performance when running VMs with multiple CPUs. The networking was improved as well, and there’s now automatic deployment of kernel modules on GNU/Linux operating systems, no longer depending on DKMS. Moreover, VirtualBox 5.1 plays nice with the systemd init system on modern distributions, and the latest Linux 4.6 and Linux 4.7 kernels are supported out of the box.
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