linux-kernel - Re: [PATCH v7 24/27] x86: Add swiotlb force off support

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Message-ID: <50D52841.9030301@zytor.com>
Date:	Fri, 21 Dec 2012 19:25:53 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 24/27] x86: Add swiotlb force off support

On 12/21/2012 07:23 PM, Eric W. Biederman wrote:
> 
> In this case YH has been working on the case of loading a kernel
> completely above 4G, and apparently he has also been testing the case of
> running a kernel with no memory below 4G.
> 

It is worth noting that we cannot run with *no* memory below 4G -- it is
not possible to run SMP at least without some memory below the 1M mark.

	-hpa


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