linux-kernel - Re: Confusions with reserve_early, reserve_bootmem, e820, efi, ... on x86

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Date:	Thu, 12 Jun 2008 05:25:03 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Paul Jackson" <pj@....com>
Cc:	"Ingo Molnar" <mingo@...e.hu>, "Bernhard Walle" <bwalle@...e.de>,
	"Johannes Weiner" <hannes@...urebad.de>,
	"Huang, Ying" <ying.huang@...el.com>, linux-kernel@...r.kernel.org,
	"Jack Steiner" <steiner@....com>
Subject: Re: Confusions with reserve_early, reserve_bootmem, e820, efi, ... on x86_64

On Thu, Jun 12, 2008 at 3:06 AM, Paul Jackson <pj@....com> wrote:
> Bernhard, Johannes, Huang, and Yinghai:
>
> I am running into some complications with reserve_bootmem vs
> reserve_early, and a reserve_early of "EFI memmap" in the
> efi_reserve_early() routine conflicting with reserve_early of
> "BIOS reserved" in reserve_ebda_region().
>
> This is on x86_64 arch, using Ingo's x86-latest, with possibly
> still buggy EFI firmware in a lab system I'm helping to develop.
>
> I have three concerns:
>
>  1) The find_overlapped_early() check called from reserve_early is
>    failing on my lab system , causing panic, when it tries to
>    register "EFI memmap" at addresses <0xe0660, 0xe0778> that
>    overlaps with the "BIOS reserved" early reserve at addresses
>    <0x9f000, 0x100000>

then reserve_ebda_region() need to be fixed.

YH
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