[Differential] D9686: fix UEFI VM's bootup on Hyper-V (i.e. Hyper-V Generation-2 VM)

[sepherosa_gmail.com (Sepherosa Ziehau)]

sepherosa_gmail.com accepted this revision.
sepherosa_gmail.com added a comment.
This revision has a positive review.


  We plan to commit this near the end of this week, if no objection comes.  It detects possible errors, and obviously will not make the situation worse than before.

REVISION DETAIL
  https://reviews.freebsd.org/D9686

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To: decui_microsoft.com, imp, jhb, will, kib, delphij, emaste, honzhan_microsoft.com, howard0su_gmail.com, marcel, tsoome, gonzo, manu, andrew, sbruno, ambrisko, allanjude, bapt, cem, smh, ian, sepherosa_gmail.com
Cc: freebsd-virtualization-list