12.3. Restrictions and Limitations

It is strongly recommended to run Red Hat Enterprise Linux 7.2 or later in the L0 host and the L1 guests. L2 guests can contain any guest system supported by Red Hat.
It is not supported to migrate L1 or L2 guests.
Use of L2 guests as hypervisors and creating L3 guests is not supported.
Not all features available on the host are available to be utilized by the L1 hypervisor. For instance, IOMMU/VT-d or APICv cannot be used by the L1 hypervisor.
To use nested virtualization, the host CPU must have the necessary feature flags. To determine if the L0 and L1 hypervisors are set up correctly, use the cat /proc/cpuinfo command on both L0 and L1, and make sure that the following flags are listed for the respective CPUs on both hypervisors:
- For Intel - vmx (Hardware Virtualization) and ept (Extended Page Tables)
- For AMD - svm (equivalent to vmx) and npt (equivalent to ept)

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