[Bug 247474] `shutdown -p now` fails to power off with VirtualBox UEFI boot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247474

            Bug ID: 247474
           Summary: `shutdown -p now` fails to power off with VirtualBox
                    UEFI boot
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: yasu at utahime.org

I have VirtualBox VM running 13-CURRENT. Environments are

Host: 64bit Windows 10 ver. 1909
VirtualBox: 6.1.10
VM: 4CPU, 8GB Memory, 100GB Disk, Audio disabled. Bridged NIC

In order to switch from legacy BIOS to UEFI I enabled UEFI on VM settings and
reinstalled OS by using FreeBSD-13.0-CURRENT-amd64-20200611-r362037-disc1.iso.
After that `shutdown -p now` (or select 'ACPI shutdown' in VM menu) fails to
power off. Shutdown itself completes successfully. But power off never happens
and CPU usage keeps high until either closing or resetting VM. If I switch back
to legacy BIOS and reinstall OS then the problem disappears. And it doesn't
happen with either 11.4-RELEASE or 12.1-RELEASE.

I tried bisect and found this problem happens with base r342108 and
after. Commit message of base r342108 says as following.

yasu at rolling-vm-freebsd5[1012]% LANG=C svn log -c 342108
------------------------------------------------------------------------
r342108 | cem | 2018-12-15 14:46:04 +0900 (Sat, 15 Dec 2018) | 7 lines

efirt: When present, attempt to use EFI runtime services to shutdown

PR:             maybe related to 233998 (inconclusive at this time)
Submitted by:   byuu <byuu AT tutanota.com> (previous version)
Reviewed by:    imp
Differential Revision:  https://reviews.freebsd.org/D18506

------------------------------------------------------------------------
yasu at rolling-vm-freebsd5[1013]%

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