VirtualBox 5.1.0 版本发布，这是一个重要的更新，主要是在性能的提高和多媒体的支持上。 更新日志： VMM:
new APIC and I/O APIC implementations that result in significantly
improved performance in certain situations (for example with networking,
bug #15295) VMM: added support for Hyper-V paravirtualized debugging of Windows guests VMM: emulate even more MMIO and shadow pagetable exits without going back to user mode GUI: overall migration to Qt5 (bug #11775) GUI: passive API event listener improving the VM GUI performance and response time Audio: added HDA (High Definition Audio) support for newer Linux guests Audio: added on-demand timers which should improve the overall performance and reduce the CPU consumption Audio: more fine-grained volume control for the AC'97 emulation, which now also takes the master volume control into account better support for Python 3
添加/修复了以下项目：
VMM: activate the x2APIC by default for Linux guests VMM: many more fixes GUI: the Detach UI action is now a part of the VM Machine menu GUI: reworked session information window GUI: the new VM wizard now allows to choose the VM location for the VM which is being created GUI: fixed location of touch events in unscaled HiDPI mode (bugs #14366, #14367) GUI: various bugfixes and internal cleanup Storage: use fallocate() or similar if present to speed up creating fixed-sized disk images (bug #5967) Storage: implemented NVMHCI-compatible storage controller Audio: various bugfixes and infrastructure improvements E1000: implemented interrupt throttling for performance improvements EFI: many improvements, for example allow to boot from USB OVF: improved handling of signed manifests API: Windows XP guests and Windows 2003 server guests now default to the E1000 T Server network card VBoxSVC: fixed several memory leaks when handling .dmg images Installers: ship VBoxBugReport Windows hosts: reworked COM proxy (e.g. bug #8298) Linux installers: no longer rely on DKMS for module rebuilding Linux Additions: fix a problem when updating the initramfs after the guest modules are compiled (bug #15579) Linux
Additions: try to fix a problem where the OpenGL libraries where loaded
by the X server when we only support X clients (bug #15574)
详情：https://www.virtualbox.org/wiki/Changelog | 
