Why nested virtualization

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Working with regions and zones. It is most often used with network controllers, but some specialized server GPUs also support it. These Virtual Functions VFs are defined by the host operating system. The number of VF is limited by the hardware. By creating multiple VFs of the same physical PCIe device you can assign individual VFs to different virtual machines and this way to share the physical device, while at the same time provide exclusive access to each of the PCI virtual functions.

PCI passthrough is a very efficient mechanism to reduce the overhead, but it creates several security issues. Using the device DMA, a virtual machine can access the physical memory of the host. IOMMU solves this by translating the device virtual address space to physical addresses with a mapping that matches the virtual address space of the virtual machine. But there is another problem.

The access control policy is applied at the group border, and communication between the devices in the same group is unrestricted. All devices that are in the same group have to always be used together. This means that if for example the network controller and the disc controller are in the same IOMMU group, you can pass them via PCI passthrough to a VM but always both devices together.

If any of the devices in the group have to be used by the host operating system, no other device in the same group can be given to a VM.

Unfortunately, there is not a good way to tell if a given CPU and motherboard will work or not, without having them and check the IOMMU groups with the command given above. The following instructions are specific to OpenNebula. OpenNebula is using host monitor to collect the available devices. This monitor is a script that is run regularly by OpenNebula on each host. Hypervisors play an important role in regulating performance in your virtual environments.

They bridge the gap between the hardware and the operating system, ensuring that your environments are able to perform as expected. There are two main types of hypervisors that you can implement in your sandbox environments:.

With nested virtualization, you can deploy VMs within VMs, and build labs containing virtualized infrastructures within a single computer. Running a Hyper-V within a VM allows you to further optimize virtual environments, providing the following benefits:. As noted above, Microsoft introduced support for nested virtualization with Hyper-V in Windows Server It is not available on the Home edition.

In its simplest form, the following command will enable you to run a Hyper-V nested virtualization:. The biggest challenge of nested virtualization is the network.