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


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