[Bug 246168] Ubuntu 20.04 QEMU Failure with nested FreeBSD bhyve

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246168

--- Comment #3 from John Hartley <drum at graphica.com.au> ---
Hi Rodney,

thanks for looking at this bug report.

Does your statement, "FreeBSD Bhyve does *not* support nested virtualization as
a host" relate to this nested topology ?

Layer 0 - FreeBSD with bhyve hypervisor (on Bare Metal with Intel VT-x VMX
support)
Layer 1 - FreeBSD with bhyve hypervisor (ie Guest of Layer 0, Host to Layer 2)
Layer 2 - FreeBSD or other OS Guest

I ask as bhyve wiki:
https://wiki.freebsd.org/bhyve#Q:_Can_I_run_multiple_bhyve_hosts_under_VMware_nested_VT-x_EPT.3F

Indicates that there should be ability to run nested topology as per my
example:

Layer 0 - VMWare or KVM with VT-x EPT
Layer 1 - FreeBSD with bhyve hypervisor (ie Guest of Layer 0, Host to Layer 2)
Layer 2 - FreeBSD or other OS Guest

I am trying to get this model up and running, as I am wanting to test metrics
collection from Layer 1 FreeBSD guest/host.

Given scarcity of information I know that this is little off the beaten track,
but I did find this example:
https://github.com/Suhoy95/SNE-reports-2019-public/tree/4-LIA-2-xen-kvm which
indicated that it had go similar nested topology going, but with Ubuntu 18.04
as Layer 0 rather than Ubuntu 20.04 as in my case.

Thanks you.

John Hartley.

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