NetBSD Problem Report #59993

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Date: Tue, 10 Feb 2026 22:46:13 +0000 (UTC)
From: campbell+netbsd@mumble.net
Reply-To: campbell+netbsd@mumble.net
To: gnats-bugs@NetBSD.org
Subject: nvmm: support nested virt
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X-From4GNATS: "campbell+netbsd@mumble.net via gnats" <gnats-admin@NetBSD.org>

>Number:         59993
>Category:       kern
>Synopsis:       nvmm: support nested virt
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Feb 10 22:50:01 +0000 2026
>Originator:     Taylor R Campbell
>Release:        current, 11, 10, 9, ...
>Organization:
The NetNVMM Virtual Machine Monitor Recursion, Inc.
>Environment:
>Description:
It would be nice if nvmm supported nested virtualization, so that you can develop and debug nvmm inside a VM.

Paper on how to do this:

https://www.usenix.org/legacy/events/osdi10/tech/full_papers/Ben-Yehuda.pdf
>How-To-Repeat:
try to use nvmm from inside qemu -accel nvmm
>Fix:
Yes, please!

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