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

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Message-ID: <CAE9FiQWY+LTZkmWmDvoLmrayG+a0uScpR=YThr+hogOU7HbJ9w@mail.gmail.com>
Date:	Fri, 21 Dec 2012 21:11:57 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	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 Fri, Dec 21, 2012 at 7:25 PM, H. Peter Anvin <hpa@...or.com> wrote:
> 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.

yes need keep 8k or so for trampoline.

but kdump only use one CPU.

Yinghai
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