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– Chapter 4. Guest Additions


This is the default when creating a new VM. Host To Guest. Enables drag and drop operations from the host to the guest only. Guest To Host. Enables drag and drop operations from the guest to the host only. Enables drag and drop operations in both directions: from the host to the guest, and from the guest to the host. Drag and drop support depends on the frontend being used. At the moment, only the VirtualBox Manager frontend provides this functionality. The modifyvm and controlvm commands enable setting of a VM’s current drag and drop mode from the command line.

As Oracle VM VirtualBox can run on a variety of host operating systems and also supports a wide range of guests, certain data formats must be translated after transfer. This is so that the destination operating system, which receives the data, is able to handle them in an appropriate manner. When dragging files no data conversion is done in any way.

For example, when transferring a file from a Linux guest to a Windows host the Linux-specific line endings are not converted to Windows line endings. Plain text: From applications such as text editors, internet browsers and terminal windows. Directories: For directories, the same formats apply as for files. If you start Oracle VM VirtualBox with Administrator privileges then drag and drop will not work with Windows Explorer, which runs with regular user privileges by default.

On Linux hosts and guests, programs can query for drag and drop data while the drag operation is still in progress. This currently is not supported.

As a workaround, a different file manager, such as Nautilus, can be used instead. This works for all supported host platforms, provided that your host operating system can make use of your accelerated 3D hardware in the first place. It is only available for certain Windows, Linux, and Oracle Solaris guests.

In particular:. OpenGL on Linux requires kernel 2. Ubuntu As a result, the Guest Additions installation program offers Direct3D acceleration as an option that must be explicitly enabled. Also, you must install the Guest Additions in Safe Mode. Because 3D support is still experimental at this time, it is disabled by default and must be manually enabled in the VM settings. Untrusted guest systems should not be allowed to use the 3D acceleration features of Oracle VM VirtualBox, just as untrusted host software should not be allowed to use 3D acceleration.

Drivers for 3D hardware are generally too complex to be made properly secure and any software which is allowed to access them may be able to compromise the operating system running them. In addition, enabling 3D acceleration gives the guest direct access to a large body of additional program code in the Oracle VM VirtualBox host process which it might conceivably be able to use to crash the virtual machine. The Aero theme is not enabled by default on Windows.

See your Windows platform documentation for details of how to enable the Aero theme. This driver acts as a hardware 3D driver and reports to the guest operating system that the virtual hardware is capable of 3D hardware acceleration. When an application in the guest then requests hardware acceleration through the OpenGL or Direct3D programming interfaces, these are sent to the host through a special communication tunnel implemented by Oracle VM VirtualBox.

The host then performs the requested 3D operation using the host’s programming interfaces. With this feature, if an application such as a video player inside your Windows VM uses 2D video overlays to play a movie clip, then Oracle VM VirtualBox will attempt to use your host’s video acceleration hardware instead of performing overlay stretching and color conversion in software, which would be slow. This currently works for Windows, Linux and Mac OS X host platforms, provided that your host operating system can make use of 2D video acceleration in the first place.

Because 2D support is still experimental at this time, it is disabled by default and must be manually enabled in the VM settings. The driver sends all overlay commands to the host through a special communication tunnel implemented by Oracle VM VirtualBox.

On the host side, OpenGL is then used to implement color space transformation and scaling. With the seamless windows feature of Oracle VM VirtualBox, you can have the windows that are displayed within a virtual machine appear side by side next to the windows of your host. This feature is supported for the following guest operating systems, provided that the Guest Additions are installed:.

After seamless windows are enabled, Oracle VM VirtualBox suppresses the display of the desktop background of your guest, allowing you to run the windows of your guest operating system seamlessly next to the windows of your host. The Host key is normally the right control key. This will enlarge the size of the VM’s display to the size of your host screen and mask out the guest operating system’s background. This provides the following advantages:.

For example, to monitor VM performance and statistics. Arbitrary string data can be exchanged between guest and host. This works in both directions. To accomplish this, Oracle VM VirtualBox establishes a private communication channel between the Oracle VM VirtualBox Guest Additions and the host, and software on both sides can use this channel to exchange string data for arbitrary purposes. Guest properties are simply string keys to which a value is attached. They can be set, or written to, by either the host and the guest.

They can also be read from both sides. In addition to establishing the general mechanism of reading and writing values, a set of predefined guest properties is automatically maintained by the Oracle VM VirtualBox Guest Additions to allow for retrieving interesting guest data such as the guest’s exact operating system and service pack level, the installed version of the Guest Additions, users that are currently logged into the guest OS, network statistics and more.

Some of this runtime information is shown when you select Session Information Dialog from a virtual machine’s Machine menu. A more flexible way to use this channel is with the VBoxManage guestproperty command. For example, to have all the available guest properties for a given running VM listed with their respective values, use this command:. To query the value of a single property, use the get subcommand as follows:.

To add or change guest properties from the guest, use the tool VBoxControl. This tool is included in the Guest Additions. When started from a Linux guest, this tool requires root privileges for security reasons.

The Guest Control File Manager is a feature of the Guest Additions that enables easy copying and moving of files between a guest and the host system.

Other file management operations provide support to create new folders and to rename or delete files. The Guest Control File Manager works by mounting the host file system. Guest users must authenticate and create a guest session before they can transfer files. At the bottom of the Guest Control File Manager, enter authentication credentials for a user on the guest system. Transfer files between the guest and the host system by using the move and copy file transfer icons. You can copy and move files from a guest to the host system or from the host system to the guest.

Click Close to end the guest session. The Guest Additions enable starting of applications inside a guest VM from the host system. This feature can be used to automate deployment of software within the guest.

For this to work, the application needs to be installed on the guest. No additional software needs to be installed on the host. Additionally, text mode output to stdout and stderr can be shown on the host for further processing.

There are options to specify user credentials and a timeout value, in milliseconds, to limit the time the application is able to run. The Guest Additions for Windows allow for automatic updating.

This applies for already installed Guest Additions versions. Also, copying files from host to the guest as well as remotely creating guest directories is available. In server environments with many VMs, the Guest Additions can be used to share physical host memory between several VMs. This reduces the total amount of memory in use by the VMs. If memory usage is the limiting factor and CPU resources are still available, this can help with running more VMs on each host.

The Guest Additions can change the amount of host memory that a VM uses, while the machine is running. Because of how this is implemented, this feature is called memory ballooning. Oracle VM VirtualBox supports memory ballooning only on bit hosts. It is not supported on Mac OS X hosts. Memory ballooning does not work with large pages enabled.

Normally, to change the amount of memory allocated to a virtual machine, you have to shut down the virtual machine entirely and modify its settings. With memory ballooning, memory that was allocated for a virtual machine can be given to another virtual machine without having to shut the machine down.

When memory ballooning is requested, the Oracle VM VirtualBox Guest Additions, which run inside the guest, allocate physical memory from the guest operating system on the kernel level and lock this memory down in the guest. This ensures that the guest will not use that memory any longer.

No guest applications can allocate it, and the guest kernel will not use it either. Oracle VM VirtualBox can then reuse this memory and give it to another virtual machine. The memory made available through the ballooning mechanism is only available for reuse by Oracle VM VirtualBox. It is not returned as free memory to the host. Requesting balloon memory from a running guest will therefore not increase the amount of free, unallocated memory on the host. Effectively, memory ballooning is therefore a memory overcommitment mechanism for multiple virtual machines while they are running.

This can be useful to temporarily start another machine, or in more complicated environments, for sophisticated memory management of many virtual machines that may be running in parallel depending on how memory is used by the guests. At this time, memory ballooning is only supported through VBoxManage. Use the following command to increase or decrease the size of the memory balloon within a running virtual machine that has Guest Additions installed:.

You can also set a default balloon that will automatically be requested from the VM every time after it has started up with the following command:. By default, no balloon memory is allocated.

This is a VM setting, like other modifyvm settings, and therefore can only be set while the machine is shut down. It avoids memory duplication between several similar running VMs. In a server environment running several similar VMs on the same host, lots of memory pages are identical. For example, if the VMs are using identical operating systems. Page Fusion currently works only with Windows and later guests.

The more similar the VMs on a given host are, the more efficiently Page Fusion can reduce the amount of host memory that is in use. It therefore works best if all VMs on a host run identical operating systems. Instead of having a complete copy of each operating system in each VM, Page Fusion identifies the identical memory pages in use by these operating systems and eliminates the duplicates, sharing host memory between several machines.

This is called deduplication. If a VM tries to modify a page that has been shared with other VMs, a new page is allocated again for that VM with a copy of the shared page.

This is called copy on write. All this is fully transparent to the virtual machine. You may be familiar with this kind of memory overcommitment from other hypervisor products, which call this feature page sharing or same page merging.

However, Page Fusion differs significantly from those other solutions, whose approaches have several drawbacks:. Traditional hypervisors scan all guest memory and compute checksums, also called hashes, for every single memory page. Then, they look for pages with identical hashes and compare the entire content of those pages.

If two pages produce the same hash, it is very likely that the pages are identical in content. This process can take rather long, especially if the system is not idling. As a result, the additional memory only becomes available after a significant amount of time, such as hours or sometimes days.

It can therefore achieve most of the possible savings of page sharing almost immediately and with almost no overhead. Page Fusion is also much less likely to be confused by identical memory that it will eliminate, just to learn seconds later that the memory will now change and having to perform a highly expensive and often service-disrupting reallocation. To enable Page Fusion for a VM, use the following command:. You can observe Page Fusion operation using some metrics. Enabling Page Fusion might indirectly increase the chances for malicious guests to successfully attack other VMs running on the same host.

See Section The Guest Additions provide services for controlling the guest system’s monitor topology. The resolution of a virtual monitor can be modified from the host side either by resizing the window that hosts the virtual monitor, through the view menu or through VBoxManage controlvm “vmname” setscreenlayout.

The decision is made automatically at each desktop session start. Since the mentioned monitor topology control services are initialized during the desktop session start, it is impossible to control the monitor resolution of display managers such as gdm, lightdm. Please refer to Section 4. When this guest property is set then VBoxDRMClient is started during the guest OS boot and stays active all the time, for both ithe display manager login screen and the desktop session.

Specifically, disabling a guest monitor except the last one invalidates the monitor topology due to limitations in the Linux kernel module vmwgfx. Chapter 4. Guest Additions. Table of Contents 4. Introduction to Guest Additions 4. Installing and Maintaining Guest Additions 4. Guest Additions for Windows 4. Guest Additions for Linux 4. Guest Additions for Oracle Solaris 4. Shared Folders 4.

Manual Mounting 4. Automatic Mounting 4. Drag and Drop 4. Supported Formats 4. Known Limitations 4. Hardware-Accelerated Graphics 4. Seamless Windows 4. Guest Properties 4. Guest Control File Manager 4. Using the Guest Control File Manager 4. Guest Control of Applications 4. Memory Overcommitment 4.

Memory Ballooning 4. Page Fusion 4. Controlling Virtual Monitor Topology 4. Introduction to Guest Additions. Installing and Maintaining Guest Additions. Guest Additions for Windows.

Microsoft Windows NT 4. Installing the Windows Guest Additions. Start the virtual machine in which you have installed Windows. Updating the Windows Guest Additions. Unattended Installation. Note On some Windows versions, such as Windows and Windows XP, the user intervention popups mentioned above are always displayed, even after importing the Oracle certificates.

Log in as Administrator on the guest. Run the following command: VBoxCertUtil. Manual File Extraction. Guest Additions for Linux.

Installing the Linux Guest Additions. If you suspect that something has gone wrong, check that your guest is set up correctly and run the following command as root: rcvboxadd setup Insert the VBoxGuestAdditions.

Change to the directory where your CD-ROM drive is mounted and run the following command as root: sh. Graphics and Mouse Integration. Updating the Linux Guest Additions. Uninstalling the Linux Guest Additions. Guest Additions for Oracle Solaris. Installing the Oracle Solaris Guest Additions.

If the CD-ROM drive on the guest does not get mounted, as seen with some versions of Oracle Solaris 10, run the following command as root: svcadm restart volfs Change to the directory where your CD-ROM drive is mounted and run the following command as root: pkgadd -G -d.

Uninstalling the Oracle Solaris Guest Additions. Updating the Oracle Solaris Guest Additions. Shared Folders. Permanent shares, that are saved with the VM settings. Manual Mounting. Automatic Mounting. Drag and Drop. Note At the moment only copying of data is supported.

Figure 4. Drag and Drop Menu Options. Note Drag and drop support depends on the frontend being used. Supported Formats. Note When dragging files no data conversion is done in any way. If you have any suggestions, provide your feedback below or submit your feedback as is. Select at least one type of issue, and enter your comments or suggestions. Enter a maximum of characters. View PDF. Figure 1 Installing Guest Additions. Figure 2 Verifying the installation. Figure 3 Setting the folder sharing mode.

Parent topic: Configuring the VM. Feedback How helpful was this page? Poor Fair Average Good Excellent. Thank you very much for your feedback. We will continue working to improve the documentation.


– How to install Guest Additions for Windows 10 on VirtualBox – Pureinfotech

Installation involves the following steps: Mount the file as your Oracle Solaris guest’s virtual CD-ROM drive, exactly the same way as Change to the directory where your CD-ROM drive is mounted and run the following command as root: pkgadd -G . Feb 24,  · To get a list of commercially supported guest operating systems of VirtualBox, please follow this link. Guest OS. Status. Remarks. Windows family. Windows 10 build (32/bit) Works, with Additions. Requires AMD-V or VT-x. May 09,  · Under the Devices and drives section, double-click to open the VirtualBox Guest Additions disc. Next, double-click the file to launch the installer. Click the Next button.

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