Main/Serial+Devices/Serial: new TCP backend for serial port. Contributed by Alexey Eromenko. Thanks! Frontends/VirtualBox+VBoxManage: adapted accordingly

PDM/Audio: Add ALSA backend (work in progress).

PDM Audio: Branch -> trunk.

Devices/Misc: new VirtualKD stub/loader device, contributed by Ivan Shcherbakov (and heavily modified afterwards to integrate cleanly into VirtualBox and match the coding style)

USB: Initial xHCI device commit (WIP).

VMM/GIM: Mapping of GIM MMIO2 regions and Hyper-V provider work.

src/VBox/Devices/Audio, src/VBox/Main/src-client, include/VBox/vmm: src/VBox/Devices/Audio: part of restructuring of audio code. Devices files correspondin to Hda, AC97 and SB16 audio. The structure of files have been modifed as per PDM specs. The modified code is under #ifdef VBOX_WITH_PDM_AUDIO_DRIVER src/VBox/Main/src-client: Driver for the VRDE that interacts with DrvAudio. Enhancement of the CFGM tree for audio. Config.kmk : addition of one configuration parameter that will control whether new audio code is disabled or enabled. "VBOX_WITH_PDM_AUDIO_DRIVER" pdmaudioifs.h: common header file between Device , Intermediate audio driver and Backends specific to audio.

some ExtPack build magic

SMC reimplementation (disabled). Works but needs save state, more keys and more testing.

Making VBOX_WITH_OVMF default, removing the old #else cases.

DevACPI cleanups.

NetShaper,E1000: Basic framework and partial implementation for network shaper

compile fixes for VBOX_WITH_EXTPACK disabled

PCI passthrough fixes

Devices/Network/DrvUDPTunnel: new network transport which sends ethernet frames encapsulated in UDP. Contributed by Christophe Devriese, and much cleaned up.

Main, Device: passthrough conditional

Move the misc files the in src/VBox/Devices/ directory into a build/ subdirectory, changing their names to match the target module.