linux-kernel - Re: [PATCH v6 24/27] x86: Add swiotlb force off support

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Message-ID: <50D68FDC.6020700@zytor.com>
Date:	Sat, 22 Dec 2012 21:00:12 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 24/27] x86: Add swiotlb force off support

On 12/21/2012 09:00 PM, Yinghai Lu wrote:
> On Fri, Dec 21, 2012 at 6:18 PM, Konrad Rzeszutek Wilk
> <konrad.wilk@...cle.com> wrote:
>> On Thu, Dec 13, 2012 at 02:02:18PM -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.
>>
>> Does this have any usage besides testing?
>
> for kdump.
>

"For kdump" isn't an answer.  There is a reason why kdump needs this.

	-hpa


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

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