Version 4.2.0 Release Candidate 2 (2012-08-22)

This is a major update. The following major new features were added:

 Improved Windows 8 support, in particular many 3D-related fixes
 GUI: VM groups (bug #288)
 GUI: expert mode for wizards
 GUI: allow to alter some settings during runtime
 Support for up to 36 network cards, in combination with an ICH9 chipset configuration (bug #8805)
 Resource control: added support for limiting network IO bandwidth; see chapter 6.9, Limiting bandwidth for network I/O, page 96
 Added possibility to start VMs during system boot on Linux, OS X and Solaris; see chapter 9.24, Starting virtual machines during system boot, page 175 (bug #950)
 Added experimental support for Drag’n’drop from the host to Linux guests. Support for more guests and for guest-to-host is planned. (bug #81)
 Added support for parallel port passthrough on Windows hosts
 Enhanced API for controlling the guest; please see the SDK reference and API documentation for more information

In addition, the following items were fixed and/or added:

 Mac OS X hosts: sign application and installer to avoid warnings on Mountain Lion
 VMM: improved VM context switch performance for Intel CPUs using nested paging
 VMM: added support for FlushByASID features of AMD CPUs (Bulldozer and newer)
 VMM: fixed unreal mode handling on older CPUs with VT-x (gPXE, Solaris 7/8/9; bug #9941)
 VMM: fixed MP tables fixes for I/O APIC interrupt routing relevant for ancient SMP guests (e.g. old OS/2 releases)
 VMM: support recent VIA CPUs (bug #10005)
 GUI: network operations manager
 GUI: allow taking screenshots of the current VM window content (bug #5561)
 GUI: allow automatically sorting of the VM list
 GUI: allow starting of headless VMs from the GUI
 GUI: allow reset, shutdown and poweroff from the Manager window
 GUI: allow to globally limit the maximum screen resolution for guests
 GUI: show the full medium part on hovering the list of recently used ISO images
 GUI: do not create additional folders when a new machine has a separator character in its name (bug #6541)
 GUI: don’t crash on terminate if the settings dialog is still open (bug #9973)
 Snapshots: fixed a crash when restoring an old snapshot when powering off a VM (bugs #9364, #9604, #10491)
 Settings: sanitise the name of VM folders and settings file (bug #10549)
 Settings: allow to store the iSCSI initiator secret encrypted
 E1000: 802.1q VLAN support (bug #10429)
 Storage: implemented burning of audio CDs in passthrough mode
 Storage: implemented support for discarding unused image blocks through TRIM for SATA and IDE and UNMAP for SCSI when using VDI images
 Storage: added support for QED images
 Storage: added support for QCOW (full support for v1 and readonly support for v2 images)
 Storage: added readonly support for VHDX images
 Solaris additions: added support for X.org Server 1.11 and 1.12
 Windows hosts: no need to recreate host-only adapters after a VirtualBox update
 Windows hosts: updated toolchain; make the source code compatible to VC 2010 and enable some security-related compiler options
 NAT: improvements for the built-in TFTP server (bugs #7385, #10286)

Version 4.2.0 Release Candidate 3 (2012-08-29)

This is a major update. The following major new features were added:

 Improved Windows 8 support, in particular many 3D-related fixes
 GUI: VM groups (bug #288)
 GUI: expert mode for wizards
 GUI: allow to alter some settings during runtime
 Support for up to 36 network cards, in combination with an ICH9 chipset configuration (bug #8805)
 Resource control: added support for limiting network IO bandwidth; see chapter 6.9, Limiting bandwidth for network I/O, page 96
 Added possibility to start VMs during system boot on Linux, OS X and Solaris; see chapter 9.24, Starting virtual machines during system boot, page 175 (bug #950)
 Added experimental support for Drag’n’drop from the host to Linux guests. Support for more guests and for guest-to-host is planned. (bug #81)
 Added support for parallel port passthrough on Windows hosts
 Enhanced API for controlling the guest; please see the SDK reference and API documentation for more information

In addition, the following items were fixed and/or added:

 Mac OS X hosts: sign application and installer to avoid warnings on Mountain Lion
 VMM: improved VM context switch performance for Intel CPUs using nested paging
 VMM: added support for FlushByASID features of AMD CPUs (Bulldozer and newer)
 VMM: fixed unreal mode handling on older CPUs with VT-x (gPXE, Solaris 7/8/9; bug #9941)
 VMM: fixed MP tables fixes for I/O APIC interrupt routing relevant for ancient SMP guests (e.g. old OS/2 releases)
 VMM: support recent VIA CPUs (bug #10005)
VMM: fixed handling of task gates if VT-x/AMD-V is disabled
 GUI: network operations manager
 GUI: allow taking screenshots of the current VM window content (bug #5561)
 GUI: allow automatically sorting of the VM list
 GUI: allow starting of headless VMs from the GUI
 GUI: allow reset, shutdown and poweroff from the Manager window
 GUI: allow to globally limit the maximum screen resolution for guests
 GUI: show the full medium part on hovering the list of recently used ISO images
 GUI: do not create additional folders when a new machine has a separator character in its name (bug #6541)
 GUI: don’t crash on terminate if the settings dialog is still open (bug #9973)
 GUI: consider scaled DPI values when display fonts on Windows hosts (bug #9864)
 Snapshots: fixed a crash when restoring an old snapshot when powering off a VM (bugs #9364, #9604, #10491)
 Clipboard: disable the clipboard by default for new VMs (see chapter 13.3.2.3, Clipboard, page 206). It can be enabled at any time using the VM menu.
 Settings: sanitise the name of VM folders and settings file (bug #10549)
 Settings: allow to store the iSCSI initiator secret encrypted
 NAT: improvements for the built-in TFTP server (bugs #7385, #10286)
 E1000: 802.1q VLAN support (bug #10429)
 Storage: implemented burning of audio CDs in passthrough mode
 Storage: fixed audio CD passthrough for certain media players
 Storage: implemented support for discarding unused image blocks through TRIM for SATA and IDE and UNMAP for SCSI when using VDI images
 Storage: added support for QED images
 Storage: added support for QCOW (full support for v1 and readonly support for v2 images)
 Storage: added readonly support for VHDX images
 Solaris additions: added support for X.org Server 1.11 and 1.12
 Solaris additions: switched to using an in-kernel mouse driver
 Windows hosts: no need to recreate host-only adapters after a VirtualBox update
 Windows hosts: updated toolchain; make the source code compatible to VC 2010 and enable some security-related compiler options

Version 4.2.0 Release Candidate 4 (2012-09-08)

This is a major update. The following major new features were added:

 Improved Windows 8 support, in particular many 3D-related fixes
 GUI: VM groups (bug #288)
 GUI: expert mode for wizards
 GUI: allow to alter some settings during runtime
 Support for up to 36 network cards, in combination with an ICH9 chipset configuration
(bug #8805)
 Resource control: added support for limiting network IO bandwidth; see chapter 6.9, Limiting
bandwidth for network I/O, page 96 (bug #3653)
 Added possibility to start VMs during system boot on Linux, OS X and Solaris; see chapter
9.24, Starting virtual machines during system boot, page 175 (bug #950)
 Added experimental support for Drag’n’drop from the host to Linux guests. Support for
more guests and for guest-to-host is planned. (bug #81)
 Added support for parallel port passthrough on Windows hosts
 Enhanced API for controlling the guest; please see the SDK reference and API documentation
for more information
In addition, the following items were fixed and/or added:
 Mac OS X hosts: sign application and installer to avoid warnings on Mountain Lion
 VMM: fixed a potential host crash triggered by shutting down a VM when another VM was
running (only affected 32-bit hosts and 64-bit OS X hosts, 4.1 regression, bug #9897)
 VMM: fixed a potential host crash under a high guest memory pressure (seen withWindows
8 guests)
 VMM: improved VM context switch performance for Intel CPUs using nested paging
 VMM: added support for FlushByASID features of AMD CPUs (Bulldozer and newer)
 VMM: fixed unreal mode handling on older CPUs with VT-x (gPXE, Solaris 7/8/9; bug
#9941)
 VMM: fixed MP tables fixes for I/O APIC interrupt routing relevant for ancient SMP guests
(e.g. old OS/2 releases)
 VMM: support recent VIA CPUs (bug #10005)
 VMM: fixed handling of task gates if VT-x/AMD-V is disabled
 GUI: network operations manager
 GUI: allow taking screenshots of the current VM window content (bug #5561)
 GUI: allow automatically sorting of the VM list
 GUI: allow starting of headless VMs from the GUI
 GUI: allow reset, shutdown and poweroff from the Manager window
 GUI: allow to globally limit the maximum screen resolution for guests
 GUI: show the full medium part on hovering the list of recently used ISO images
 GUI: do not create additional folders when a new machine has a separator character in its
name (bug #6541)
 GUI: don’t crash on terminate if the settings dialog is still open (bug #9973)
 GUI: consider scaled DPI values when display fonts on Windows hosts (bug #9864)
 GUI: if a bridged network interface cannot be found, don’t refuse to start the VM but allow
the user to change the setting immediately (bug )
 Snapshots: fixed a crash when restoring an old snapshot when powering off a VM (bugs
#9364, #9604, #10491)
 Clipboard: disable the clipboard by default for new VMs (see chapter 13.3.2.3, Clipboard,
page 206). It can be enabled at any time using the VM menu.
 Settings: sanitise the name of VM folders and settings file (bug #10549)
 Settings: allow to store the iSCSI initiator secret encrypted
 NAT: improvements for the built-in TFTP server (bugs #7385, #10286)
 E1000: 802.1q VLAN support (bug #10429)
 Storage: implemented burning of audio CDs in passthrough mode
 Storage: fixed audio CD passthrough for certain media players
 Storage: implemented support for discarding unused image blocks through TRIM for SATA
and IDE and UNMAP for SCSI when using VDI images
 Storage: added support for QED images
 Storage: added support for QCOW (full support for v1 and readonly support for v2 images)
 Storage: added readonly support for VHDX images
 USB: don’t crash if a USB device is plugged or unplugged when saving or loading the VM
state (SMP guests only)
 Solaris additions: added support for X.org Server 1.11 and 1.12
 Solaris additions: switched to using an in-kernel mouse driver
Windows hosts: no need to recreate host-only adapters after a VirtualBox update
 Windows hosts: updated toolchain; make the source code compatible to VC 2010 and
enable some security-related compiler options
 Windows Additions: fixed memory leak in VBoxTray (bug #10808)

Version 4.2.0 (2012-09-13)

This is a major update. The following major new features were added:

 Improved Windows 8 support, in particular many 3D-related fixes
 GUI: VM groups (bug #288)
 GUI: expert mode for wizards
 GUI: allow to alter some settings during runtime
 Support for up to 36 network cards, in combination with an ICH9 chipset configuration
(bug #8805)
 Resource control: added support for limiting network IO bandwidth; see chapter 6.9, Limiting
bandwidth for network I/O, page 96 (bug #3653)
 Added possibility to start VMs during system boot on Linux, OS X and Solaris; see chapter
9.24, Starting virtual machines during system boot, page 175 (bug #950)
 Added experimental support for Drag’n’drop from the host to Linux guests. Support for
more guests and for guest-to-host is planned. (bug #81)
 Added support for parallel port passthrough on Windows hosts
 Enhanced API for controlling the guest; please see the SDK reference and API documentation
for more information
In addition, the following items were fixed and/or added:
 Mac OS X hosts: sign application and installer to avoid warnings on Mountain Lion
 VMM: fixed a potential host crash triggered by shutting down a VM when another VM was
running (only affected 32-bit hosts and 64-bit OS X hosts, 4.1 regression, bug #9897)
 VMM: fixed a potential host crash under a high guest memory pressure (seen withWindows
8 guests)
 VMM: improved VM context switch performance for Intel CPUs using nested paging
 VMM: added support for FlushByASID features of AMD CPUs (Bulldozer and newer)
 VMM: fixed unreal mode handling on older CPUs with VT-x (gPXE, Solaris 7/8/9; bug
#9941)
 VMM: fixed MP tables fixes for I/O APIC interrupt routing relevant for ancient SMP guests
(e.g. old OS/2 releases)
 VMM: support recent VIA CPUs (bug #10005)
 VMM: fixed handling of task gates if VT-x/AMD-V is disabled
 VMM: page fusion fixes
 GUI: network operations manager
 GUI: allow taking screenshots of the current VM window content (bug #5561)
 GUI: allow automatically sorting of the VM list
 GUI: allow starting of headless VMs from the GUI
 GUI: allow reset, shutdown and poweroff from the Manager window
 GUI: allow to globally limit the maximum screen resolution for guests
 GUI: show the full medium part on hovering the list of recently used ISO images
 GUI: do not create additional folders when a new machine has a separator character in its
name (bug #6541)
 GUI: don’t crash on terminate if the settings dialog is still open (bug #9973)
 GUI: consider scaled DPI values when display fonts on Windows hosts (bug #9864)
 GUI: if a bridged network interface cannot be found, don’t refuse to start the VM but allow
the user to change the setting immediately (bug )
 Snapshots: fixed a crash when restoring an old snapshot when powering off a VM (bugs
#9364, #9604, #10491)
 Clipboard: disable the clipboard by default for new VMs (see chapter 13.3.2.3, Clipboard,
page 206). It can be enabled at any time using the VM menu.
 Settings: sanitise the name of VM folders and settings file (bug #10549)
 Settings: allow to store the iSCSI initiator secret encrypted
 NAT: improvements for the built-in TFTP server (bugs #7385, #10286)
 NAT: fixed memory leak when disabling the NAT engine (bug #10801)
 E1000: 802.1q VLAN support (bug #10429)
 Storage: implemented burning of audio CDs in passthrough mode
 Storage: fixed audio CD passthrough for certain media players
 Storage: implemented support for discarding unused image blocks through TRIM for SATA
and IDE and UNMAP for SCSI when using VDI images
 Storage: added support for QED images
 Storage: added support for QCOW (full support for v1 and readonly support for v2 images)
 Storage: added readonly support for VHDX images
 USB: don’t crash if a USB device is plugged or unplugged when saving or loading the VM
state (SMP guests only)
Solaris additions: added support for X.org Server 1.11 and 1.12
 Solaris additions: switched to using an in-kernel mouse driver
 Windows hosts: no need to recreate host-only adapters after a VirtualBox update
 Windows hosts: updated toolchain; make the source code compatible to VC 2010 and
enable some security-related compiler options
 Windows Additions: fixed memory leak in VBoxTray (bug #10808)

Version 4.2.2 (2012-10-18)
This is a maintenance release. The following items were fixed and/or added:
 VMM: adapted to changes in Mac OS X 10.8.2 (bug #10965)
 GUI: restored VM item tool-tip functionality (4.2 regression)
 GUI: added group item tool-tip functionality
 GUI: fixed handling of the .ova/.ovf file name association (4.2 regression)
 GUI: it was not possible to change any setting before the first VM was created (bug #10928)
 GUI: disable grouping action if all the selected items are full children list of the same group
already
 GUI: added menu for runtime drag-and-drop option change
 GUI: cleanup shared-clipboard menu on visual-mode change
 GUI: make sure VM receives keyboard focus on entering fullscreen-mode on Win host (bug
#11051)
 GUI: disable proxy authentication for security reasons
 3D Support: DrawIndexedPrimitiveUP implementation fixes for the Windows WDDM video
driver (bug #10929)
 Storage: fixed a release assertion in the AHCI emulation when requests where cancelled
with async I/O disabled
 Storage: fixed a hang during VM reset under certain circumstances (bug #10898)
 NAT: fixed a crash under rare circumstances (Windows hosts only; bug #10128)
 NAT: automatically use the host resolver if the host name server is set to some unusual
loopback value (bug #10864)
 E1000: fixed a VirtualBox crash during intensive network transfers (4.2 regression; bugs
#10936, #10969, #10980)
 ICH9: fixed PCI bridge initialization
 USB mouse: ensure that the last mouse event doesn’t get lost if no URBs are available
 BIOS: certain legacy guests (e.g. Windows 95) didn’t find the boot device after a warm
reboot
 BIOS: don’t trash the palette in text modes when setting the border color
 EFI: fixed OS X guest autoboot (4.2 regression)
 VBoxManage: fixed output of showvminfo –machinereadable (bug #10973)
 VBoxManage: fixed parsing of storageattach –discard (bug #11023)
 VBoxManage: fixed wrong output of the HPET setting in showvminfo (bug #11065)
 VBoxManage: fixed closing the guest session after executing a guest process via guest
control
 VBoxShell: adaptions to interface name changes
 Guest Additions device: fixed a Guest Additions hang when a machine was reset after a
crash
 Linux hosts / guests: Linux 3.7-rc1 fixes
 Linux Additions: support X.Org Server 1.13
 Linux Additions: fixed a hang when the X server was restarted with old guest kernels
 Linux Additions: fixed a VBoxService crash during CPU hot remove (bug #10964)
 Windows Additions: fixed automatic screen resize issue for NT4 guests
 OS/2 Additions: fixed shutdown hang
 OS/2 Additions: fixed mouse driver panic
 Solaris hosts: fixed autostart service going into maintenance mode after all VMs started
 Solaris hosts: fixed linking the host driver with the dtrace module

Version 4.3.0 Beta 1 (2013-08-20)
This is a major update. The following major new features were added:
 VMM: major rewrite of the VT-x code including many bug fixes and performance improvements
(for example bug #9659)
 GUI: keyboard shortcuts management (input page of global preferences extended with
possibility to edit general keyboard shortcuts for VirtualBox Manager and Virtual Machine)
 GUI: extended messaging mechanism (new non-modal popup overlays used to show noncritical
warnings and provide user with additional information)
 GUI: video capturing support (bug #4766)
 GUI: host touch devices support (GUI passes host touch-events to guest)
 Emulated USB touch devices
 VRDP: support for IPv6
 NAT: experimental virtual router mode: several VMs are attached to the same internal
network and share one NAT service (see chapter 6.4, Network Address Translation Service
(experimental), page 95)
In addition, the following items were fixed and/or added:
 VMM: properly handle NMIs on Linux hosts with X2APIC enabled
 GUI: update check uses https
 GUI: lot of internal stuff rewritten (cleanup and bug-fixes)
 Settings: global and per-VM default frontend configuration, useful to select the use of
alternative VM frontends
 Settings: limit depth of snapshot tree to 250 levels, as more will lead to decreased performance
and may trigger crashes
 Main: new event queue implementation which does not use the host’s native event queue
for processing VirtualBox events anymore
 Main: use the XDG standard configuration folder instead of .VirtualBox on systems where
it is appropriate (bug #5099)
VBoxManage: list more information about hard disk/DVD/floppy media, and support the
--long option to show really all available details
 VBoxManage: added support for optional command line parameters for the automatic
Guest Additions update
 VBoxManage: added support for listing active guest sessions, guest processes and/or guest
files via guestcontrol list <all|sessions|processes|files>
 VBoxManage: added support for closing active guest sessions via guestcontrol session
close --session-id <ID>| --session-name <name or pattern>|--all
 VBoxManage: added support for terminating active guest processes via guestcontrol
process kill|close|terminate --session-id <ID>| --session-name <name or
pattern> <PID> ... <PID n> or guestcontrol [p[s]]kill --session-id <ID>|
--session-name <name or pattern> <PID> ... <PID n>
 VBoxManage: added support for watching guest sessions via guestcontrol watch
 3D support: several fixes
 3D support: several fixes for Mac OS X hosts
 OVF: several fixes
 Keyboard: fix for reporting key sequences like Ctrl+Alt+Del for the USB keyboard emulation
 Shared Clipboard/X11: support for BMP-format images, contributed by François Revol
 Windows hosts: don’t cause massive DPC latency (bug #6242)
 Windows hosts: consider symlinks when retrieving volume information (bug #11962)
 Windows Additions: fixed misbehavior with guest display power management (WDDM
driver only; bug #11170)
 Windows guests: ability to track guest user idle times through the newly introduced event
IGuestUserStateChangedEvent

Version 4.3.0 Beta 2
This is a major update. The following major new features were added:
 VMM: major rewrite of the VT-x code and the AMD-V code including many bug fixes and
performance improvements (for example bug #9659)
 GUI: extended messaging mechanism (new non-modal popup overlays used to show noncritical
warnings and provide user with additional information)
 GUI: keyboard shortcuts management (input page of global preferences extended with
possibility to edit general keyboard shortcuts for VirtualBox Manager and Virtual Machine)
 GUI: video capturing support (bug #4766)
 Added USB touch device emulation
 Added SCSI CD-ROM emulation, including boot support
 VRDP: support for IPv6
 Guest Control: guest sessions now are running in dedicated, impersonated session processes
(needs at least Guest Additions 4.3 installed)
 Guest Control: implemented IGuestFile support
 NAT: experimental virtual router mode: several VMs are attached to the same internal
network and share one NAT service (see chapter 6.4, Network Address Translation Service
(experimental), page 95)
In addition, the following items were fixed and/or added:
 VMM: properly handle NMIs on Linux hosts with X2APIC enabled
 VMM: significantly improved performance of NetWare 5.x/6.x guests on host systems without
nested paging support
 VMM: fixed losing host NMIs while in VT-x guest-context
 VMM: changed order of actions in emulated task switch (bug #10532)
 GUI: update check uses https
 GUI: numerous minor internal cleanups and bug fixes
GUI, VBoxManage: when unregistering a VM, also unregister the hard disk images which
are used exclusively (bug #10311)
 Snapshots: made live snapshots work again (bug #9255)
 Teleportation: made it work again (bug #9455)
 Storage: implemented AHA-154x compatibility mode in the emulated BusLogic SCSI HBA
 Storage: significantly improved performance of large ATAPI PIO transfers (BeOS, Minix 3
guests affected)
 Storage: added floppy formatting emulation (NB: cannot be used to change existing media
geometry)
 Settings: global and per-VM default frontend configuration, useful to select the use of
alternative VM frontends
 Settings: limit depth of snapshot tree to 250 levels, as more will lead to decreased performance
and may trigger crashes
 Settings: the per-VM hwvirtextexcl setting has been replaced by a global hwvirtexclusive
property
 Main: new event queue implementation which does not use the host’s native event queue
for processing VirtualBox events anymore
 Main: use the XDG standard configuration folder instead of .VirtualBox on systems where
it is appropriate (bug #5099)
 Main: extension pack framework can now support loading HGCM modules, contributed by
Jeff Westphal
 VBoxManage: list more information about hard disk/DVD/floppy media, and support the
--long option to show really all available details
 VBoxManage: added support for optional command line parameters for the automatic
Guest Additions update
 VBoxManage: added support for listing active guest sessions, guest processes and/or guest
files via guestcontrol list <all|sessions|processes|files>
 VBoxManage: added support for closing active guest sessions via guestcontrol session
close --session-id <ID>| --session-name <name or pattern>|--all
 VBoxManage: added support for terminating active guest processes via guestcontrol
process kill|close|terminate --session-id <ID>| --session-name <name or
pattern> <PID> ... <PID n> or guestcontrol [p[s]]kill --session-id <ID>|
--session-name <name or pattern> <PID> ... <PID n>
 VBoxManage: added support for watching guest sessions via guestcontrol watch
 3D support: several fixes
 3D support: several fixes for Mac OS X hosts
 OVF: several fixes
 Keyboard: fix for reporting key sequences like Ctrl+Alt+Del for the USB keyboard emulation
 Shared Clipboard/X11: support for BMP-format images, contributed by François Revol
 Windows hosts: don’t cause massive DPC latency (only on certain hosts; still needs improving;
bug #6242)
 Windows hosts: consider symlinks when retrieving volume information (bug #11962)
 Windows hosts: fixed an issue with USB2 devices being inaccessible when plugged into
USB 3.0 ports
 Windows Additions: fixed misbehavior with guest display power management (WDDM
driver only; bug #11170)
 Linux Additions: fixed udev detection in the init script with Linux 3.x kernels
 Windows guests: ability to track guest user idle times through the newly introduced event
IGuestUserStateChangedEvent

Version 4.3.0 Beta 3 (2013-09-20)
This is a major update. The following major new features were added:
 VMM: major rewrite of the VT-x code and the AMD-V code including many bug fixes and
performance improvements (for example bug #9659)
 GUI: extended messaging mechanism (new non-modal popup overlays used to show noncritical
warnings and provide user with additional information)
 GUI: keyboard shortcuts management (input page of global preferences extended with
possibility to edit general keyboard shortcuts for VirtualBox Manager and Virtual Machine)
 GUI: video capturing support (bug #4766)
 Added USB touch device emulation
 Added SCSI CD-ROM emulation, including boot support
 VRDP: support for IPv6
 Guest Control: guest sessions now are running in dedicated, impersonated session processes
(needs at least Guest Additions 4.3 installed)
 Guest Control: implemented IGuestFile support
 NAT: experimental virtual router mode: several VMs are attached to the same internal
network and share one NAT service (see chapter 6.4, Network Address Translation Service
(experimental), page 95)
In addition, the following items were fixed and/or added:
 VMM: properly handle NMIs on Linux hosts with X2APIC enabled
 VMM: significantly improved performance of NetWare 5.x/6.x guests on host systems without
nested paging support
 VMM: fixed losing host NMIs while in VT-x guest-context
 VMM: changed order of actions in emulated task switch (bug #10532)
 GUI: update check uses https
 GUI: numerous minor internal cleanups and bug fixes
 GUI, VBoxManage: when unregistering a VM, also unregister the hard disk images which
are used exclusively (bug #10311)
 Snapshots: made live snapshots work again (bug #9255)
 Teleportation: made it work again (bug #9455)
 Storage: implemented AHA-154x compatibility mode in the emulated BusLogic SCSI HBA
 Storage: significantly improved performance of large ATAPI PIO transfers (BeOS, Minix 3
guests affected)
 Storage: added floppy formatting emulation (NB: cannot be used to change existing media
geometry)
 Settings: global and per-VM default frontend configuration, useful to select the use of
alternative VM frontends
 Settings: limit depth of snapshot tree to 250 levels, as more will lead to decreased performance
and may trigger crashes
 Settings: the per-VM hwvirtextexcl setting has been replaced by a global hwvirtexclusive
property
 Main: new event queue implementation which does not use the host’s native event queue
for processing VirtualBox events anymore
 Main: eliminate the use of SysV semaphores on all host OSes other than Windows, namely
Linux, Solaris and Mac OS X, with the consequence that no system reconfiguration is
needed to run more than approximately 100 VMs
 Main: use the XDG standard configuration folder instead of .VirtualBox on systems where
it is appropriate (bug #5099)
 Main: extension pack framework can now support loading HGCM modules, contributed by
Jeff Westphal
 VBoxManage: list more information about hard disk/DVD/floppy media, and support the
--long option to show really all available details
 VBoxManage: added support for optional command line parameters for the automatic
Guest Additions update
 VBoxManage: added support for listing active guest sessions, guest processes and/or guest
files via guestcontrol list <all|sessions|processes|files>
 VBoxManage: added support for closing active guest sessions via guestcontrol session
close --session-id <ID>| --session-name <name or pattern>|--all
 VBoxManage: added support for terminating active guest processes via guestcontrol
process kill|close|terminate --session-id <ID>| --session-name <name or
pattern> <PID> ... <PID n> or guestcontrol [p[s]]kill --session-id <ID>|
--session-name <name or pattern> <PID> ... <PID n>
 VBoxManage: added support for watching guest sessions via guestcontrol watch
 3D support: several fixes
 3D support: several fixes for Mac OS X hosts
 OVF: several fixes
Keyboard: fix for reporting key sequences like Ctrl+Alt+Del for the USB keyboard emulation
 Shared Clipboard/X11: support for BMP-format images, contributed by François Revol
 Windows hosts: don’t cause massive DPC latency (only on certain hosts; still needs improving;
bug #6242)
 Windows hosts: consider symlinks when retrieving volume information (bug #11962)
 Windows hosts: fixed an issue with USB2 devices being inaccessible when plugged into
USB 3.0 ports
 Windows Additions: fixed misbehavior with guest display power management (WDDM
driver only; bug #11170)
 Linux Additions: fixed udev detection in the init script with Linux 3.x kernels
 Windows guests: ability to track