[Bug 247636] Ubuntu 18.04 & 20.04 guest kernel panic on boot with 12.1 bhyve + graphical UEFI

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247636

--- Comment #4 from Peter Grehan <grehan at FreeBSD.org> ---
On an Ubuntu 20.04 host system (Thinkpad, Intel(R) Core(TM) i5-8250U CPU @
1.60GHz) and a FreeBSD 12.1-RELEASE/amd64 L1 guest, I was able to boot 2xvCPU
L2
live-CD guests:

Ubuntu 16.04
Ubuntu 18.04
Ubuntu 20.04 (with caveat)

With the 20.04 L2 guest, I was hitting the MSI issue fixed in r360399 and not
in 12.1. However, a workaround is to use 1 vCPU for the guest, and this worked.

With a recent snapshot for the L1
guest(FreeBSD-13.0-CURRENT-amd64-20200625-r362596-disc1.iso) a 2 vCPU 20.04 L2
guest was able to be booted.

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