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

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Message-Id: <20080616130503.1a3a72dc.pj@sgi.com>
Date:	Mon, 16 Jun 2008 13:05:03 -0500
From:	Paul Jackson <pj@....com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	ying.huang@...el.com, mingo@...e.hu, tglx@...utronix.de,
	yhlu.kernel@...il.com, steiner@....com, travis@....com,
	linux-kernel@...r.kernel.org, andi@...stfloor.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 4/8] x86 boot: allow overlapping ebda and efi memmap
 memory ranges

hpa wrote:
> We *are* going to have similar hacks.  That's not a question.

I agree ;)  That's not the question.  I have no religious objection
to hacks.  I just try to keep their population in check.  In some
cases (PC BIOS and EFI come to mind ;) I am less successful than
in other cases.

> *Not* perpetuating may ... cause odd behaviours that only are
> noticeable when you, say, boot from one OS into another.

So I take it you are saying that the future permutations and, in this
case with nested boots, combinations are sufficiently diverse and
unpredictable that as a practical matter we should perpeturate this
(gentle) hack.

I'm fine with that.

Huang - would you agree to this safety reservation of the ebda area
even on EFI enabled systems?

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.940.382.4214
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