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Date: Thu, 29 May 2008 11:41:54 -0700
From: "Yinghai Lu" <yhlu.kernel@gmail.com>
To: "Jeremy Fitzhardinge" <jeremy@goop.org>
Subject: Re: [PATCH] x86: extend e820 ealy_res support 32bit - fix #2
Cc: "Rusty Russell" <rusty@rustcorp.com.au>,
       "Thomas Gleixner" <tglx@linutronix.de>, "Ingo Molnar" <mingo@elte.hu>,
       "H. Peter Anvin" <hpa@zytor.com>,
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On Thu, May 29, 2008 at 6:37 AM, Jeremy Fitzhardinge <jeremy@goop.org> wrote:
> Yinghai Lu wrote:
>>
>> can we use e820 entries for that? So the domain builder could have
>> several entries for E820_RAM and E820_RESERVED...
>>
>
> I tried this, but it doesn't work; the kernel crashes during boot,
> presumably because it's trying to use the reserved memory as heap.  I
> suspect the e820 maps are not registered early enough or something...
>
> (One thought: if reserving in the E820 map were enough, then couldn't we use
> it for all the early reservations?)

"e820 reserved entries" means kernel will only read it.

reserve_early will be converted to bootmem via reserve_bootmem[_generic]
and later it could be freed and be reused.

YH