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

From: Eric W. Biederman
Date: Fri Dec 21 2012 - 21:42:46 EST

Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> writes:

> On Mon, Dec 17, 2012 at 11:15:56PM -0800, Yinghai Lu wrote:
>> So use could disable swiotlb from command line, even swiotlb support
>> is compiled in. Just like we have intel_iommu=on and intel_iommu=off.
> You really need to spell out why this is useful.

YH why can't we safely autodetect that the swiotlb is unusable when
there is no memory below 4G free?

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