[Bug 211746] [Hyper-V] UEFI VM can't boot from the iso installation disk

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211746

            Bug ID: 211746
           Summary: [Hyper-V] UEFI VM can't boot from the iso installation
                    disk
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: decui at microsoft.com

As I mentioned in https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195819#c24,
I found the I couldn't boot UEFI VM (i.e. Hyper-V Generation-2 VM) with the
10.3 uefi iso, the 11-alpha iso and 11-beta1  iso.

The symptom is the same (it looks the loader fails to load the kernel, or less
likely the kernel crashes at the very early point where the uefi fb driver
fails to load?). 

I'll upload the screenshot FYI.

The bug happens on Windows Server 2012 R2, 2016 TP5 host or Windows 8.1, 10
hosts.

Since the bug also exists in the 10.3 UEFI iso (which was released in March), I
think the bug was introduced before that time.

Note: the 10.2 uefi iso can boot (see bug 195819) to the "Welcome to FreeBSD"
installation screen with "set machdep.disable_tsc_calibration=1" and UP VM (SMP
VM still hangs), so the loader in 10.2 is good.

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