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

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

--- Comment #28 from Dexuan Cui <decui at microsoft.com> ---
(In reply to Dexuan Cui from comment #27)

> We can notice there is a 4MB BootServicesCode range at [12MB, 16MB) ...
loader.efi just writes into this range by force -- this is unsafe anyway!

To fix this correctly & thoroughly, IMO we need a relocatable kernel, but
that would require a lot of complicated long term work:
https://reviews.freebsd.org/D9686?id=25414#inline-56969

For now, I suggest we should only apply the idea "reduce the size of the
staging area if necessary" to VM running on Hyper-V, we should restore the
old behavior on physical machines since that has been working for people
for a long period of time, though it's  potentially unsafe.

I think in the loader we can use CPUID to tell if we're running on Hyper-V or
not.

I'm making a patch for this...

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