[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 #12 from Dexuan Cui <decui at microsoft.com> ---
(In reply to Marcel Moolenaar from comment #10)
Hi Mercel,
You're correct about the second bug -- we don't hit the second bug just because
we are lucky: when accessing 0xf37cb000, we actually access 0x337cb000, since
0xf - 0x4 * 3 == 0x3. This is my understanding.

I made the below changes and got the new log:

+       staging = 0x40000000; /* 1GB */
-       status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData,
+       status = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData,
            STAGE_PAGES, &staging);

efi_copy_finish: calling trampoline
efi_copy_finish: staging=3d000000
efi_copy_finish: staging_end=40000000
efi_copy_finish: staging_offset=3ce00000
efi_copy_finish: src=0x3d000000, dst=0x200000, last=0x40000000
...
trying to write: 0(0x3fd72fe0) to 0(0x2f72fe0)
trying to write: 0(0x3fd72fe8) to 0(0x2f72fe8)
trying to write: 0(0x3fd72ff0) to 0(0x2f72ff0)
trying to write: 0(0x3fd72ff8) to 0(0x2f72ff8)
trying to write: 0(0x3fd73000) to 2f74023(0x2f73000)   Dexuan: Crash!!!

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