added inline comments.


> kib wrote in copy.c:79-84
> UEFI firmware is guaranteed to be executed with VA==PA indeed, but loader 
> changes the mapping after ExitBootServices(), making each 2G VA mapped by low 
> 2G physical.
> I did not wrote anything about issues in your patch, rather, I tried to 
> enumerate problems that must be handled to allow boot from arbitrary UEFI 
> memory map.

Got it. Thanks a lot for sharing the details about the background!  Yeah, I've 
realized the complexity of booting from arbitrary address, which would require 
a lot of really in-depth and long term work.  So I'd like to use this patch as 
a temporary workaround for UEFI VM on Hyper-V. :-)



To:, imp, jhb, will, kib, delphij, emaste,,,, marcel
Cc: freebsd-virtualization-list
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