= Changelog for VirtualBox 4.1 = '''!VirtualBox 4.1.0''' (released 2011-07-19)[[BR]][[BR]] This version is a major update. The following major new features were added: * Support for cloning of VMs (bug #5853, see the manual for more information): full clones can be created through the GUI and VBoxManage, linked clones only through VBoxManage * GUI: enhanced wizard for creating new virtual disks * GUI: new wizard for copying virtual disks * GUI: keep the aspect ratio in scale mode (Windows and OSX hosts only; bug #7822) * VMM: raised the memory limit for 64-bit hosts to 1TB * Experimental support for PCI passthrough for Linux hosts, see the manual for more information * Windows guests: Experimental WDDM graphics driver, supporting Windows Aero (bug #4607) and providing Direct3D support using a cleaner approach (no need to install the guest drivers in Safe Mode anymore) * Guest Additions: status of modules and features can now be queried separately by the frontends * Networking: new network attachment mode "Generic Driver", which offers an open plugin architecture for arbitrary and separately distributable virtual network implementations * Host-only Networking: fixed host crash in kernels prior to 2.6.29 * New Networking Mode UDP Tunnel: allows to interconnect VMs running on different hosts easily and transparently, see the manual for more information * Experimental support for SATA hard disk hotplugging available with VBoxManage * Solaris hosts: New Crossbow based bridged networking driver for Solaris 11 build 159 and above In addition, the following items were fixed and/or added: * VMM: more SMP timer fixes * VMM: fixed sporadic recompiler crashes with SMP guests * VMM: many small fixes * GUI: when reverting to a snapshot, ask for taking a snapshot of the current state * GUI: added a View menu * GUI: added a setting for the promiscuous mode policy for internal networks, bridged networks and host-only networks * GUI: added slider for setting the CPU execution cap allowing to limit the amount of CPU time spent for the execution of the guest, see the manual for more information. * GUI: the VM description is editable during the runtime of a VM (bug #1551) * GUI: added proxy settings (bug #2870) * GUI: made the number of SATA ports configurable * GUI: decrease time before showing the VM configuration dialog * VBoxManage: more convenient configuration of storage controller attachments by automatically determining the port or device parameter when a storage controller has only one port or device per port * VBoxManage: changed syntax of the guestcontrol command group, fixed various bugs, removed obsolete options * VBoxBalloonCtrl: new service for automatic dynamic adjustment of the balloon size for running VMs * Settings: machine names and snapshot names are not allowed to be a valid UUID * Settings: provide better diagnostics if a single medium is used twice in a VM configuration * Settings: provide better diagnostics for errors in medium create/merge/clone operations, and fix memory leaks in error cases * Storage: ATA/SATA drives can be marked as non-rotational, i.e. the guest OS will detect them as a SSD if supported, which can improve performance * Storage: virtual CD/DVD images will be detached if the guest ejects the medium, unless the drive is marked to handle ejects only on a temporary basis * Storage: the medium UUID can be changed again when attaching a medium for the first time, which allows using images which are exact duplicates including the UUID * Storage: fixed possible data corruption under certain circumstances with VHD and Parallels images (bug #9150) * Storage: fixed unnecessary expansion when cloning differential images in VDI format * Storage: fixed detection code to handle empty files for VDI and VMDK format * Storage: fixed access to CD/DVD images beyond 4GB when using the SATA controller (bug #8592) * Floppy: several bugs have been fixed * Floppy: make it possible to unmount a host floppy disk (bug #6651) * BIOS: disk-related structures are now checksummed correctly (bug #8739) * USB: many fixes for the Windows USB host driver * NAT: reduced memory footprint * Networking: fixed the problem with segmentation offloading when several VMs are transmitting in parallel * Networking: workaround for a bug in wireshark when operating directly on a capture file created by !VirtualBox * Serial: announce the serial devices in the ACPI tables to make Windows guests find the virtual hardware (bug #7411) * VRDP: support for TLS connections (see the manual for more information) * VRDP: support for multimonitor client configurations with MS RDP clients * VRDP: fixed a rare screen corruption * 3D support: fixed ''GL_VERSION'' string for different locales (bug #8916) * Webservice: fixed timeout handling with HTTP 1.1 keepalive, and be more robust when connections fail * VBoxSVC: fixed regression when several clients trigger autostart simultaneously * Main: fixed incorrect handling of the medium location for media which are not file based (e.g. iSCSI), which resulted in confusing location values in many places * JAX-WS client bindings: fixed resource leak * Sources: fixed USB 2.0 support using extension packs for non-official builds * Mac OS X hosts: fixed non-VT-x mode on Lion hosts * Windows hosts: fixed copy'n'paste in the GUI and for the VM window (bug #4491) * Windows hosts (64-bit only): enabled removing of all mediums when removing a VM * Windows hosts (64-bit only): enabled live snapshot deletion * Windows hosts: use native controls in the installer (bug #5520) * Solaris hosts: fixed preemption issue with Solaris 11 hosts (builds 166 and above) * Solaris hosts: better control of USB device access on Solaris 11 hosts * Guest Additions: improved driver installation on Windows guests * Guest Additions: fixed high CPU usage while executing guest programs from the host * Solaris Additions: fixed automounting of shared folders (bug #8014) For the changelog of previous !VirtualBox series, have a look at * [wiki:Changelog-4.0 VirtualBox 4.0] * [wiki:Changelog-3.2 VirtualBox 3.2] * [wiki:Changelog-3.1 VirtualBox 3.1] * [wiki:Changelog-3.0 VirtualBox 3.0] * [wiki:Changelog-2.2 VirtualBox 2.2] * [wiki:Changelog-2.1 VirtualBox 2.1] * [wiki:Changelog-2.0 VirtualBox 2.0] * [wiki:Changelog-1.6 VirtualBox 1.6]