What's new in Hyper-V on Windows Server | Microsoft Docs
Due to the risk and complexities associated with PCI passthrough, it should be disabled by default. If enabled for a specific need, you will need to have appropriate processes in place to ensure the hardware is clean before re-issue. Instances use this functionality to provide network, storage, video, and other devices that may be needed. With this in mind, most instances in your environment will exclusively use virtual hardware, with a minority that will require direct hardware access. The major open source hypervisors use QEMU for this functionality.
While QEMU fills an important need for virtualization platforms, it has proven to be a very challenging software project to write and maintain. Much of the functionality in QEMU is implemented with low-level code that is difficult for most developers to comprehend. The hardware virtualized by QEMU includes many legacy devices that have their own set of quirks. Putting all of this together, QEMU has been the source of many security problems, including hypervisor breakout attacks.
It is important to take proactive steps to harden QEMU. We recommend three specific steps: Minimizing the code base.
Perform an unattended install of the operating system. Specify a login name, full name, and login password for a default user on the guest operating system. The specified password is also used for the root user account on the guest.
Should i turn on virtualization technology?
The Guest Additions are installed on the VM. Start the virtual machine. This step completes the unattended install process. The VirtualBox Manager window is not displayed. Optional Update the guest operating system to use the latest Oracle Linux packages.
On the guest VM, run the following command: Depending on a VM's configuration, the guest will see the following virtual hardware: These devices are supported by almost all past and present operating systems. This is unlike nearly all other emulated devices.
What's new in Hyper-V on Windows Server 2016
Whereas providing one of these would be enough for Oracle VM VirtualBox by itself, this multitude of storage adapters is required for compatibility with other hypervisors.
Windows is particularly picky about its boot devices, and migrating VMs between hypervisors is very difficult or impossible if the storage controllers are different.
Note that for Windows 7 guests, 3rd party drivers must be installed for xHCI support. General Settings In the Settings window, under General, you can configure the most fundamental aspects of the virtual machine such as memory and essential hardware.
- Intel Atom
The following tabs are available. Basic Tab In the Basic tab of the General settings category, you can find these settings: The name under which the VM is shown in the list of VMs in the main window. As a result, you can only use characters which are allowed in your host operating system's file names. You can display these with VBoxManage. The type of the guest operating system for the VM. This is the same setting that is specified in the New Virtual Machine wizard.
Whereas the default settings of a newly created VM depend on the selected operating system type, changing the type later has no effect on VM settings. This value is purely informational and decorative.
The version of the guest operating system for the VM. Advanced Tab The following settings are available in the Advanced tab: With this setting, you can specify any other folder for each VM.
You can select here whether the clipboard of the guest operating system should be shared with that of your host. If you select Bidirectional, then Oracle VM VirtualBox will always make sure that both clipboards contain the same data. In such a case, this setting has no effect. For security reasons, the shared clipboard is disabled by default.
This setting can be changed at any time using the Shared Clipboard menu item in the Devices menu of the virtual machine. This setting enables support for drag and drop. Select an object, such as a file, from the host or guest and directly copy or open it on the guest or host. Multiple per-VM drag and drop modes allow restricting access in either direction. For drag and drop to work the Guest Additions need to be installed on the guest. Note Drag and drop is disabled by default.
This setting can be changed at any time using the Drag and Drop menu item in the Devices menu of the virtual machine. Description Tab On the Description tab you can enter a description for your virtual machine. This has no effect on the functionality of the machine, but you may find this space useful to note down things such as the configuration of a virtual machine and the software that has been installed into it.
Disk Encryption Tab The Disk Encryption tab enables you to encrypt disks that are attached to the virtual machine. To enable disk encryption, select the Enable Disk Encryption check box. Settings are available to configure the cipher used for encryption and the encryption password.
System Settings The System category groups various settings that are related to the basic hardware that is presented to the virtual machine. Note As the activation mechanism of Microsoft Windows is sensitive to hardware changes, if you are changing hardware settings for a Windows guest, some of these changes may trigger a request for another activation with Microsoft. Motherboard Tab On the Motherboard tab, you can configure virtual hardware that would normally be on the motherboard of a real computer.
The specified amount of memory will be requested from the host operating system, so it must be available or made available as free memory on the host when attempting to start the VM and will not be available to the host while the VM is running. Generally, it is possible to change the memory size after installing the guest operating system. But you must not reduce the memory to an amount where the operating system would no longer boot.
Determines the order in which the guest operating system will attempt to boot from the various virtual boot devices. This needs to be configured in detail on the command line. You can select which chipset will be presented to the virtual machine. For modern guest operating systems such as Mac OS X, that old chipset is no longer well supported. Note that the ICH9 support is experimental and not recommended for guest operating systems which do not require it.
Using the virtual USB tablet has the advantage that movements are reported in absolute coordinates, instead of as relative position changes. This makes using the VM less tedious even if Guest Additions are not installed. It is also required if you want to use more than one virtual CPU in a virtual machine. Turning it on after installation will have no effect however.How to Enable Intel VT-X or Intel Virtualization Technology from BIOS
ACPI is the current industry standard to allow operating systems to recognize hardware, configure motherboards and other devices and manage power.
ACPI can only be turned off using the command line. However, turning it on after installation will have no effect. Sets the number of virtual CPU cores the guest operating systems can see. You should not configure virtual machines to use more CPU cores than are available physically. This includes real cores, with no hyperthreads. Configures the CPU execution cap. Note that limiting the execution time of the virtual CPUs may cause guest timing problems.
A warning is displayed at the bottom of the Processor tab if an Execution Cap setting is made that may affect system performance. To enable this feature, select the Extended Features check box. This is made possible by adding another 4 bits to memory addresses, so that with 36 bits, up to 64 GB can be addressed.
Intel Atom - Wikipedia
Oracle VM VirtualBox provides paravirtualization interfaces to improve time-keeping accuracy and performance of guest operating systems. You can select for each virtual machine individually whether Oracle VM VirtualBox should use software or hardware virtualization.
Advanced users may be interested in technical details about software versus hardware virtualization. In most cases, the default settings on the Acceleration tab will work well. Oracle VM VirtualBox selects sensible defaults, depending on the operating system that you selected when you created the virtual machine.
In certain situations, however, you may want to change the preconfigured defaults. Display Settings The following tabs are available for configuring the display for a virtual machine. Screen Tab Video Memory: Sets the size of the memory provided by the virtual graphics card available to the guest, in MB. As with the main memory, the specified amount will be allocated from the host's resident memory. Based on the amount of video memory, higher resolutions and color depths may be available.
The GUI will show a warning if the amount of video memory is too small to be able to switch the VM into full screen mode. The minimum value depends on the number of virtual monitors, the screen resolution and the color depth of the host display as well as on the use of 3D acceleration and 2D video acceleration. Extra memory may be required if display acceleration is used. With this setting, Oracle VM VirtualBox can provide more than one virtual monitor to a virtual machine.
If a guest operating system supports multiple attached monitors, Oracle VM VirtualBox can pretend that multiple virtual monitors are present. Up to eight such virtual monitors are supported. The output of the multiple monitors are displayed on the host in multiple VM windows which are running side by side. However, in full screen and seamless mode, they use the available physical monitors attached to the host. As a result, for full screen and seamless modes to work with multiple monitors, you will need at least as many physical monitors as you have virtual monitors configured, or Oracle VM VirtualBox will report an error.
Enables scaling of the display size. For multiple monitor displays, you can set the scale factor for individual monitors, or globally for all of the monitors. You can set a default scale factor for all VMs.
Use the Display tab in the Global Settings dialogs. If a virtual machine has Guest Additions installed, you can select here whether the guest should support accelerated 3D graphics. Enable 2D Video Acceleration: If a virtual machine with Microsoft Windows has Guest Additions installed, you can select here whether the guest should support accelerated 2D video graphics.
Specifies the graphics adapter type used by the VM. For the full list of supported maximum configurations, see Plan for Hyper-V scalability in Windows Server Nested virtualization new This feature lets you use a virtual machine as a Hyper-V host and create virtual machines within that virtualized host. This can be especially useful for development and test environments.
To use nested virtualization, you'll need: To run at least Windows Server or Windows 10 on both the physical Hyper-V host and the virtualized host. A processor with Intel VT-x nested virtualization is available only for Intel processors at this time. Networking features new New networking features include: Virtual machine multi queues VMMQ.
Improves on VMQ throughput by allocating multiple hardware queues per virtual machine. The default queue becomes a set of queues for a virtual machine, and traffic is spread between the queues.
Quality of service QoS for software-defined networks. Manages the default class of traffic through the virtual switch within the default class bandwidth. For more about new networking features, see What's new in Networking. Production checkpoints new Production checkpoints are "point-in-time" images of a virtual machine. These give you a way to apply a checkpoint that complies with support policies when a virtual machine runs a production workload.
Production checkpoints are based on backup technology inside the guest instead of a saved state. For Linux virtual machines, the file system buffers are flushed to create a checkpoint that's consistent with the file system. If you'd rather use checkpoints based on saved states, choose standard checkpoints instead.
For details, see Choose between standard or production checkpoints in Hyper-V. Important New virtual machines use production checkpoints as the default. This allows you to upgrade the cluster without downtime.
The cluster runs at a Windows Server R2 feature level until you upgrade all nodes in the cluster and update the cluster functional level with the Windows PowerShell cmdlet, Update-ClusterFunctionalLevel. Important After you update the cluster functional level, you can't return it to Windows Server R2. Manage the cluster, Hyper-V, and virtual machines from a node running Windows Server or Windows You can move virtual machines between all of the nodes in the Hyper-V cluster.
To use new Hyper-V features, all nodes must run Windows Server and the cluster functional level must be updated. The virtual machine configuration version for existing virtual machines isn't upgraded. You can upgrade the configuration version only after you upgrade the cluster functional level. Virtual machines that you create are compatible with Windows Server R2, virtual machine configuration level 5. After you update the cluster functional level: You can enable new Hyper-V features.
To make new virtual machine features available, use the Update-VmConfigurationVersion cmdlet to manually update the virtual machine configuration level. Shared virtual hard disks updated You can now resize shared virtual hard disks. Shared virtual hard disks can be grown or shrunk while the virtual machine is online.
Guest clusters can now also protect shared virtual hard disks by using Hyper-V Replica for disaster recovery. Enable replication on the collection. Enabling replication on a collection is only exposed through the WMI interface.
You cannot manage replication of a collection through PowerShell cmdlet or UI.