linux-kernel - Re: [PATCH 04/13] x86, mm: Revert back good

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Date:	Wed, 03 Oct 2012 11:34:13 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jacob Shin <jacob.shin@....com>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Tejun Heo <tj@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH 04/13] x86, mm: Revert back good_end setting for 64bit

On 10/03/2012 09:51 AM, Jacob Shin wrote:
>
> Any comments, thoughts? hpa? Yinghai?
>
> So it seems that during init_memory_mapping Xen needs to modify page table
> bits and the memory where the page tables live needs to be direct mapped at
> that time.
>
> Since we now call init_memory_mapping for every E820_RAM range sequencially,
> the only way to satisfy Xen is to find_early_page_table_space (good_end needs
> to be within memory already mapped at the time) for every init_memory_mapping
> call.
>
> What do you think Yinghai?
>

I outlined the sane way to do this at Kernel Summit for Yinghai and 
several other people.  I need to write it up for people who weren't 
there, but I don't have time right at the moment.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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