port-amd64/54208: kernel fails to start as bhyve guest

[venture37%geeklan.co.uk@localhost]

>Number:         54208
>Category:       port-amd64
>Synopsis:       kernel fails to start as bhyve guest
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed May 15 20:40:00 +0000 2019
>Originator:     Sevan Janiyan
>Release:        
>Organization:
>Environment:
>Description:
trying to start the netbsd-install kernel from the 201905150450Z build on FreeBSD 12 as a bhyve guest results in 
vm exit[0]
                reason          VMX
                                        rip             0x000000000020939c
                                                                                inst_length     2
                                                                                                        status          0
                                                                                                                                exit_reason     2
                                                                                                                                                 qualification    0x0000000000000000
                                        inst_type               0
                                                                        inst_error              0
                                                                                                 Abort

System is happy with 8.99.34, so there's been a regression sometime in the last 3 months.
>How-To-Repeat:
try to boot the netbsd-install kernel as a bhyve guest on FreeBSD 12/amd64
>Fix: