VirtualBox 6.0.6 for PC Windows

- VMM: XSAVE, AVX and AVX-2 are now exposed to the guest
- VMM: fixed a Guru Meditation when rebooting certain guests (for example Solaris doing fast reboot) by fixing the implementation for INIT IPI)
- GUI: Encryption progress reflection
- GUI: Encryption errors handling
- GUI: Properly disable unavailable menu actions
- GUI: properly report errors when trying to save the VM settings instead instead of dead-locking
- API: allow to hotplug SATA optical devices
- VRDP: fixed listening for IPv6 on some systems
- USB: fixed attaching of high speed USB devices if xHCI is not present (they always ended up on the OHCI controller)
- Audio: improved volume control
- Audio: fixed SB16 playback
- Drag and drop: Transfers can be canceled properly, bug fixes
- Guest Control: Major overhaul, for example fixing wrong parameter quoting
- Shared Folders: fixed a crash when removing (in some cases also when creating) a shared folder when the VM is running
- OVA: fixed importing of appliances without attached hard disks
- Snapshots: fixed a bug in handling a saved state when taking an offline snapshot
- Snapshots: fixed a sporadic bug when restoring a snapshot which left unused diff images behind
- VirtualKD: re-added device which was omitted by accident
- Windows hosts: more hardening fixes
- Additions/X.Org: fixed guest-to-host mouse mapping for Solaris and Linux Mint/Ubuntu 12.04.0 guests.
- Additions/X.Org: fixed resizing problem in openSUSE 10.3 and guests of a similar generation
- documented the Guest Additions heartbeat service

# Features were added:
- Drag’n drop support (bidirectional) for Windows, Linux and Solaris guests
- GUI: Support hotplugging for SATA disks
- New, modular audio architecture for providing a better abstraction of the host audio backends
# Following items were fixed and/or added:
- VMM: improved timing on Solaris hosts with older VT-x hosts without preemption timers
- VBoxManage: when exporting an appliance, support the suppression of MAC addresses, which means they will be always recreated on import, avoiding duplicate MAC addresses for VMs which are imported several times
- API: block the removal of the current snapshot if it has child snapshots (only relevant for VMs without snapshottable hard disks, their presence always prevented removal), which resulted in VM config corruption
- API: mark VM configs with snapshots but without current snapshot as inaccessible, as this combination is nonsense
- API: fix information for some automatically generated events (only with XPCOM, Windows host was not affected), which caused errors when getting some of the attributes over the webservice
- API: fix crashes in Java API clients using the XPCOM binding, happened with output parameters only
- API: a number of settings (e.g. network settings) can now also be changed when the VM is in saved state

- GUI: in the snapshots pane, protect the age of snapshots against wrong host time
- NAT Network: fixed a bug which prevented to propagate any DNS name server / domain / search string information to the NAT network
- NAT Network: don't delay the shutdown of VBoxSVC on Windows hosts
- Mouse support: the mouse could not be moved under rare conditions if no Guest Additions are installed
- Storage: if the guest ejects a virtual CD/DVD medium, make the change permanent
- VGA: made saving secondary screen sizes possible in X11 guests
- SDK: fixed the VirtualBox.tlb file
- rdesktop-vrdp: make it work with USB devices again
- USB: fixed a possible BSOD on Windows hosts under rare conditions
- iPXE: enable the HTTP download protocol on non-Linux hosts
- Mac OS X hosts: don't panic on hosts with activated SMAP
- Linux hosts: don't crash Linux 4.0 hosts

- VMM: emulation fix for the ENTER instruction under certain conditions; fixes Solaris 10 guests (VT-x without unrestricted guest execution)
- VMM: fix for handling NMIs on Linux hosts with X2APIC enabled
- NAT/NAT Network: fix connection drops when the host's DHCP lease was renewed
- NAT: don't crash on an empty domain list when switching the DNS host configuration
- PXE: re-enable it on Windows hosts
- Shared Folders: fixed a problem with Windows guests
- Audio: improved record quality when using the DirectSound audio backend
- VBoxManage: when executing the controlvm command take care that the corresponding VM runtime changes are saved permanently
- Windows Installer: properly install the 32-bit version of VBoxRes.dll on 32-bit hosts
- Linux hosts / guests: Linux 4.0 fixes
- OS/2 Additions: fixed mouse integration
- X11 Additions: fixed a sporadic failure to deactivate virtual screens

* VMM: refined measurement of TSC frequency on the host, improves timekeeping for guests
* VMM: decreased CPU load resulting from guest MMIO writes to the virtual APIC
* VMM: fixed interception of debug exceptions, observed while using the dbx debugger on Solaris guests (VT-x only)
* GUI: 3D overlay window positioning code improved, fixed potential misplacement of 3D accelerated guest graphics content
* GUI: fixed accident SSL authentication failures during update check on Windows hosts
* GUI: never send the "ACPI power" keyboard scancode to the guest, we have the ACPI power button for that
* GUI: was unable to properly restore seamless mode VM from snapshot/saved-state under some circumstances
* VBoxHeadless: don't crash if 3D is enabled in the VM settings
* ATA: fixed several passthrough issues
* Audio: fixed DirectSound failure when the the host has no audio input device (Windows hosts only)
* SB16: fixed compatibility issue (bug #13769)
* Storage: fixed broken CD/DVD passthrough when using the IDE controller
* NAT: new ping proxy for Windows hosts
* NAT: Properly report outbound connect(2) failures to guest with TCP RST or ICMP
* NAT Network: no need for frequent wakeups in VBoxNetDHCP and VBoxNetNAT
* Host-only adapter: prevent Windows from creating an "Unidentified network"
* Bridged Networking: don't leak host-to-guest traffic to the wireless network when bridging to a wireless interface
* Main: fixed a possible race when changing the medium leading to a deadlock under rare conditions
* VBoxManage: fixed return code if starting a VM failed
* API: fixed 2 deadlock opportunities related to medium handling
* API: fixed bug in XPCOM which created too few worker threads, sporadically resulting in a deadlock
* SDK: fixed a garbage collection leak in the Python VirtualBox webservice API binding
* Linux hosts: fixes for activated SMAP
* X11 guests: prevent unwanted hiding of guest screens on multi-monitor guests
* X11 guests: added support for X.Org Server 1.17
* X11 Additions: fixed a memory leak in VBoxService if libdbus is available but dbus-daemon isn't running
* Windows Additions: prevent VBox WDDM driver from loading if host reports weak OpenGL capabilities. 3D content now can be shown over Remote Desktop connection.
* Winodws Additions: some fixes for recent Windows 10 Previews
* Linux Additions: fixed a compatibility issue with 64-bit Linux 2.4 kernels
* Linux Additions: fixed a potential use-after-free when unloading the VBoxGuest module
* Linux Additions: Linux 3.19 fixes

# The following items were fixed and/or added:
* VMM: fixed reboot hang of 32-bit Windows SMP guests
* VMM: proper Math Fault handling with certain legacy guests
* VMM: fixed a Guru Meditation VINF_EM_TRIPLE_FAULT on older CPUs that don't support MSR-bitmaps (VT-x only)
* GUI: fix 3D overlay window re-parenting issue when VM goes to full screen mode on X11 hosts.
* GUI: fix occasional loss of focus in full-screen mode on X11 host systems (4.3.16 regression)
* GUI: Mac OS X: wizards should have Cancel button
* GUI: added a global option to prevent automatic raising of the new window by mouse move with multi-screen guests
* API: accept remote display port 0 as the default RDP port (bug #8534)
* VBoxManage: fixed crash when executing showvminfo command under certain circumstances
* ACPI: fixed occasional Guru Meditations in ACPI timer code (4.3.18 regression)
* EFI: improved performance of IDE disk access
* EFI: fixed a bug in the EFI video driver which prevented Windows to boot in UEFI mode
* EFI: properly announce the amount of RAM for big VMs
* Storage: fixed a crash under certain circumstances when a medium was ejected from a drive attached to the SATA controller without inserting a new medium before pausing or closing the VM (4.3.16 regression)
* Storage: fixed an interrupt acknowledge issue causing hanging guests or slower I/O (4.3.18 regression)
* Storage: fixed broken resume after the VM was suspended due to a full disk if host I/O caching is used
* Storage: fixed a Guru Meditation under certain conditions when using the DevLsiLogic controller with VMs running in raw mode (4.3 regression)
* Guest Control: fixed a bug which might lead to a crash during recursive copy
* SDK: Java COM bindings fixes
* iPXE: enable the HTTP download protocol
* Runtime: do not use a fixed stack size creating temporary threads during initialization
* Windows hosts: fixed more startup problems on certain Windows hosts due to conflicts with anti-virus software; better error reporting (4.3.14 regression)
* Windows hosts: fixed DirectSound host audio failure under certain conditions
* Windows hosts: fixed additional cases of 4.3.14 regression whereby AltGr stopped working for some people
* Windows Additions: preserve guest monitor layout when resizing Windows 7 or newer guests
* Linux Additions: Linux 3.18 compile fixes

# The following items were fixed and/or added:
- VMM: fixed a potential misbehavior after restoring the A20 state from a saved state
- GUI: fixed full-screen mode mini-toolbar related regressions for different platforms and window managers
- GUI: X11: fixed full-screen mode Unity panels quirk caused by mini-toolbar code changes in last release
- GUI: X11: added possibility to use legacy full-screen mode as the new one can cause multi-screen issues under Unity, see the manual for more information
- GUI: Mac OS X: fixed full-screen mode artifact causing black screen when 3D acceleration was enabled on 10.10 Yosemite hosts
- GUI: Mac OS X: fixed regression in user-space swiping from/to VBox in full-screen mode
- GUI: Mac OS X: fixed issue with switching to VBox in full-screen mode through Alt+Tab and Mission Control
- Storage: fixed data corruption when resizing huge VHD images under certain circumstances
- Storage: fixed a rare hang during startup when the BIOS enumerates the storage devices attached to the SATA controller
- Storage: follow the spec with AHCI interrupt acknowledge
- Storage: fixed broken iSCSI authentication
- NAT Network: properly parse port forwarding rules to allow UDP rules
- USB: fixed a crash on Linux hosts with older Linux kernels and several other fixes
- ACPI: fixed ACPI timer anomalies
- Guest Control: fixed a memory leak
- Main: when removing a VM, do also remove the VBoxStartup.log file which might exist on Windows hosts
- Windows hosts: fixed more startup problems on certain Windows hosts due to conflicts with anti-virus software; better error reporting
- Windows hosts: propagate the process startup information to the child process
- Mac OS X hosts: don't force using the discrete GPU
- Windows Additions: some Windows 10 tweaks
- X11 guests: fix a bug handling video driver display properties which prevented GNOME Shell on Fedora 21 from starting
- Linux hosts / guests: fixed a few remaining warnings in the kernel log if memory allocation fails

* The following items were fixed and/or added:
- VMM: fixed restoring 32-bit FPU state on 64-bit capable VMs and restoring guest FPU in raw-mode VMs (4.3 regression)
- GUI: properly restore normal/scale mode guest-screen size after exiting full-screen/seamless mode
- GUI: mini-toolbar should provoke less artifacts/conflicts with 3D guest rendering
- GUI: Mac OS X: Native full-screen multi-screen transition was able to blackout host-screens for nearly minute
- GUI: X11: Modern window managers should now use native full-screen multi-screen mapping API
- GUI: added extradata item for configuring the mouse capture behavior, see the manual for more information
- Storage: fixed a VBoxSVC crash when querying an iSCSI target with authentication configured (4.3.14 regression)
- Storage: fixed a rare data corruption during reads if another allocating write is running concurrently and accesses the same range
- Storage: fixed a rare crash for certain VHD images from other products
- Storage: fixed a rare release assertion when using the AHCI controller
- Floppy: fixed read errors and guest memory corruption when running under control of QEMM
- 3D: added experimental support for rendering on offline GPUs for Mac OS X host
- 3D: fixed white window appearing on entering FullScreen mode on OSX host
- 3D: fixed video recording support for 3D data regression
- 3D: fixes for MS Office 2013 support
- 3D: several fixes
- Bridged Networking: improved IPv6 support when bridging to a wireless interface
- NAT: prevent internal DNS service from stuck in host-resolver mode when host was switched from one network to another one while host was sleeping (Mac OS X hosts)
- NAT: preserve DF (if possible) and TOS when proxying outbound UDP datagrams
- NAT: don't let multicast datagrams out
- NAT: fixed handling of large incoming UDP datagrams on Windows hosts
- NAT: fixed handling of the RFC 1533 DHCP PAD option
- NAT Network: fixed inbound half-close on Windows hosts
- NAT Network: preserve IPv4 DF (if possible), TTL, TOS and IPv6 Hop Limit when proxying outbound UDP datagrams
- VRDP: fixed a rare crash when using remote audio input
- USB: fixed several regressions from 4.3.14
- Audio: made the HDA sound emulation work with certain OSX guests (e.g. Mountain Lion)
- Windows hosts: fixed startup problems on certain Windows hosts due to conflicts with anti-virus software (4.3.14 regression)
- Windows hosts: fixed 4.3.14 regression whereby AltGr stopped working for some people
- X11 hosts: made the extra key on Brazilian Thinkpads work
- X11 hosts: fixed a problem of input focus cycles and immediately released key presses in full screen mode
- Linux hosts: fixed flooding the kernel log with USB related messages when passing through certain USB devices to a VM
- Linux guests: stop applications crashing when drm_wait_vblank is called
- Linux guests: fix a crash in gnome-session
- X11 guests: do not start VBoxClient over an SSH connection
- X11 guests: added support for X.Org Server 1.16
- X11 guests: fixed a wrong parameter in the video driver which caused problems with full-screen X11 clients
- VirtualKD: introduced stub/loader device for speeding up Windows kernel debugging

# The following items were fixed and/or added:
- VMM: more fixes for MSR emulation on certain hardware
- VMM: improve MSI handling under rare circumstances (only relevant for the ICH9 chipset)
- VMM: fixed #UD exception for 64-bit guests with the EFER.SCE bit and the SYSCALL instruction (VT-x only; 4.3 regression)
- VMM: fixed timekeeping after resuming SMP guests
- VMM: properly wake up a halted VCPU on NMI/SMI
- GUI: fixed a potential crash
- GUI: fixed stuck AltGr key on Windows hosts
- GUI: fixed a potential error during the version check
- GUI: shortcut change should not require Enter/Return (or other trigger) to confirm
- GUI: fixed update check which was broken due to changing the location of the root certificates
- VBoxManage: fixed typo in showvminfo --machinereadable
- NAT: fixed inbound half-close
- NAT: fixed slow upload speed under certain conditions
- NAT Network: fixed potential loss of inbound TCP data
- NAT Network: fixed potential infinite stalls of TCP connections over IPv6
- NAT Network: fixed resets of TCP connections on Windows hosts
- NAT Network: fixed inbound half-close on Mac OS X hosts
- NAT Network: fixed socket leak on Solaris hosts
- NAT Network: fixed ping of mapped host loopback on Mac OS X and Solaris hosts, fixed proxying of IMCP errors on Mac OS X
- Host-Only Network: fixed SNMP ifConnectorPresent value on Windows
- Storage: fixed a possible crash with CD/DVD passthrough under certain circumstances
- Storage: fixed a crash when trying to open an inaccessible QED or QCOW image
- Storage: fixed data corruption or read errors under rare circumstances
- AHCI: fixed a crash under rare circumstances
- USB: performance fixes
- ICH9: properly reset MSI capability on reset
- Keyboard: active modifier keys during suspend were stuck after resuming the host
- 3D: fixed misbehavior with huge guests (i.e. guest more than 4GB guest memory
- 3D: several fixes
- API: properly detect the Windows 8.1 guest OS type
- ExtPack: cleanup of dangling uninstallation directories
- Linux hosts / guests: compile fix for EL7
- Linux Additions: made 3D pass-through work with recent versions of Mesa in the guest
- Linux Additions: Linux 3.16 fixes
- Mac OS X hosts: when scanning for host CD/DVD devices also consider BlueRay devices
- OS/2 Additions: fixed gengradd.dll library name
- Solaris Additions: fixed permissions of files and directories located on shared folders
- Windows host installer: fixed the need for rebooting Windows after installation or upgrade, extended logging for NetFlt/NetAdp (un)installation

* The following items were fixed and/or added:
- VMM: more fixes for MSR emulation on certain hardware
- VMM: improve MSI handling under rare circumstances (only relevant for the ICH9 chipset)
- VMM: fixed #UD exception for 64-bit guests with the EFER.SCE bit and the SYSCALL in-struction (VT-x only; 4.3 regression)
- VMM: fixed timekeeping after resuming a multi-CPU VM
- GUI: fixed a potential crash
- GUI: fixed stuck AltGr key on Windows hosts
- GUI: fixed a potential error during the version check
- GUI: shortcut change should not require Enter/Return (or other trigger) to confirm
- NAT: fixed inbound half-close
- NAT: fixed slow upload speed under certain conditions
- NAT Network: fixed inbound half-close on Mac OS X hosts
- NAT Network: fixed socket leak on Solaris hosts
- NAT Network: fixed ping of mapped host loopback on Mac OS X and Solaris hosts, fixed proxying of IMCP errors on Mac OS X
- Host-Only Network: fixed SNMP ifConnectorPresent value on Windows
- Storage: fixed a possible crash with CD/DVD passthrough under certain circumstances
- Storage: fixed a crash when trying to open an inaccessible QED or QCOW image
- Storage: fixed data corruption or read errors under rare circumstances
- AHCI: fixed a crash under rare circumstances
- USB: performance fixes
- ICH9: properly reset MSI capability on reset
- 3D: fixed misbehavior with huge guests (i.e. guest more than 4GB guest memory
- 3D: several fixes
- API: properly detect the Windows 8.1 guest OS type
- Linux hosts / guests: compile fix for EL7
- Linux Additions: made 3D pass-through work with recent versions of Mesa in the guest
- Mac OS X hosts: when scanning for host CD/DVD devices also consider BlueRay devices
- OS/2 Additions: fixed gengradd.dll library name
- Solaris Additions: fixed permissions of files and directories located on shared folders

# The following items were fixed and/or added:
* VMM: fixed an occasional Guru Meditation (Mac OS X hosts only)
* VMM: fixed a rare condition that would fail to invalidate guest TLB entries or would invalidate them when not required (Windows hosts only)
* VMM: fixed a VERR_NOT_SUPPORTED Guru Meditation seen with certain guests, e.g. OpenServer 5.0.7
* VMM: more fixes for MSR emulation on certain hardware
* GUI: fixed mouse positioning with mouse integration disabled and multiple guest screens (Windows hosts only)
* GUI: fixed crash in VM manager
* GUI: fixed crash under rare conditions on entering/exiting fullscreen/seamless mode
* Shared Clipboard: don't stop working after taking a snapshot
* AHCI: fixed a crash under rare circumstances
* API: fixed a hang during VM shutdown under rare conditions
* NAT: fixed generation of malformed ICMP error datagrams (4.3.10 regression)
* NAT: fixed potential crash in DNS proxy
* NAT Network: don't drop port forwarding rules after some time
* NAT: fixed ARP cache corruption and network loss in Windows guest caused by iSCSI service activity
* USB: improved check if a storage device is currently mounted to the host when the device is about to be attached to the VM (Mac OS X hosts only)
* 3D support: several fixes, including better support for Ubuntu 14.04
* VRDP: fixed a potential crash on client disconnect
* VBoxSVC: fixed a race when a new client is started a few seconds after the last client terminated (Windows hosts only)
* VBoxSVC: fixed VirtualBox.xml registry corruption after VM renaming
* VBoxSVC: fixed a potential crash caused by incorrect USB device filter (Mac OS X hosts only)
* Windows hosts: partly support 32-bit COM on 64-bit systems
* Windows host installer: implemented merge module (msm) support
* Linux hosts: fixed dependency of boot script on older Debian systems
* Linux guests: fix symbolic link to shared folder helper
* Linux Additions: don't crash VBoxService during guest execute for users without a password
* Linux Additions: fixed a bug in guest execution where the guest process terminated with VERR_INTERRUPTED to the host

- Fixed issue hangs on "Starting Virtual Machine" regression

# The following items were fixed and/or added:
* VMM: more work on improving the emulation of certain MSR registers on certain host CPUs
* VMM: fixed single-stepping for real-mode guests (VT-x without unrestricted guest execution) and some I/O instructions
* VMM: fixed a potential problem with COW pages if nested paging is not available
* GUI: Mac OS X: experimental native full screen support for Mountain Lion and Mavericks
* GUI: Mac OS X: removed the mini-toolbar minimize button which doesn't work under Mac OS X full screen mode anyway
* GUI: experimental HID LEDs synchronization for Windows and Mac OS X hosts: fixed keyboard re-synchronization if the feature is disabled (as done by default)
* GUI: fixed a potential crash when opening the preferences menu
* OVF: fixed a crash of the VirtualBox Manager when re-starting guest export
* 3D support: several fixes
* HGCM: fixed a problem with saved states which could cause several guest misbehavior after a VM was started from a saved state
* Storage: fixed a bug preventing to compact differential snapshots under certain conditions
* VBoxSVC: fixed a segmentation fault on Linux hosts if a very long path exists under /dev
* API: fixed guest misbehavior under certain conditions if a storage medium was attached or removed at VM runtime
* Windows installer: make the --silent parameter work again
* Mac OS X Networking: prevent local traffic (VM-to/from-host) from leaking to wire
* Windows Additions: fixed the environment for guest processes (4.3.8 regression)
* Windows Additions/WDDM: fixed divide by zero exception with multiple guest screens under certain conditions
* Linux Additions: install correctly on Ubuntu guest systems with a /usr/lib64 directory
* X11 Additions: fix for the VBoxClient process not exiting correctly (bug #12348) and consuming too much processor time