[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 #19 from Dexuan Cui <decui at microsoft.com> ---
(In reply to Dexuan Cui from comment #18)

It looks this is indeed a complex issue and a lots of work is required to have
a thorough fix.

For now, I'm planning to make a patch to verify the assumption that the
physical memory in the range
[2MB, 2MB+EFI_STAGING_SIZE) is indeed Conventional Memory that doesn't contain
firmware/loader data/code:

if 'staging_end' is not in the same Conventional Memory block as 'staging', we
print a warning and decrease 'staging_end' to the end of the memory block.

This won't introduce new issues or risks, but can indeed help in the cases like
this bug. :-)

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