Re: [PATCH 4/8] x86 boot: allow overlapping ebda and efi memmap memory ranges

["H. Peter Anvin" <hpa@zytor.com>]

Paul Jackson wrote:
> hpa wrote:
>> Realistically, we need the infrastructure to be able to make paranoia 
>> reservations, and you need to be able to deal with later finding they 
>> are actually in use.
> 
> While the tone of your reply sounds like something I would naturally
> agree with, I can't actually figure out what you mean in this case ;).
> 
> In particular, Peter, would you agree/disagree/other with the direction
> that Huang and I agreed to last night:
> 
>> Would you recommend doing this with code in arch/x86/kernel/head.c,
>> that did not invoke reserve_ebda_region() if efi_enabled was set?

I disagree with it, I do not consider it safe.  I think you have to 
consider the difference between a "safety reservation" and a "actual 
reservation", with the latter being allowed to overlap the former.

	-hpa