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

[Yinghai Lu]

On Fri, Dec 21, 2012 at 7:25 PM, H. Peter Anvin <hpa@xxxxxxxxx> 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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