In order to use nested virtualization, Fedora Quick Docs[1] advises to activate 
that feature in the host kernel using modprobe and editing the file 
/etc/modprobe.d/kvm.conf. The comment in this file provides the same 
information. Additionally, you are to configure the processor of the VM hosting 
a nested VM as passthrough. The RHEL 8 documentation [2] provides the same 
information as various articles on other Web pages. In RHEL 9 documentation I 
couldn’t find anything about this. Additionally, you are to configure the 
processor of the VM hosting a nested VM as passthrough.

According to my findings these informations seem to be obsolete or in need of 
supplementation. At least everything works fine without any additional 
configuration at all (at least if the host processor as well as the processor 
configured in the VM support virtualization).

The Fedora docs team is in the process to check and update Fedora 
documentation. 

It would be really helpful if someone with more technical knowledge about that 
matter than me would provide me with more detailed information und maybe links 
to current information. Even better if someone familiar with the matter would 
be willing to review an updated article.




--
Peter Boy
https://fedoraproject.org/wiki/User:Pboy
p...@fedoraproject.org

Timezone: CET (UTC+1) / CEST (UTC+2)


Fedora Server Edition Working Group member
Fedora docs team contributor and board member
Java developer and enthusiast




[1] 
https://docs.fedoraproject.org/en-US/quick-docs/using-nested-virtualization-in-kvm/
[2] 
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_virtualization/creating-nested-virtual-machines_configuring-and-managing-virtualization
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