linux-kernel - Re: [PATCH v7u1 26/31] x86: Don't enable swiotlb if there is not enough ram for it

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Message-ID: <CAE9FiQVpAfDb1_5TP=CqAQZQZKq=5AqQWo1NE3Sedijg+ML-gA@mail.gmail.com>
Date:	Fri, 4 Jan 2013 15:00:43 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Shuah Khan <shuahkhan@...il.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>, Jan Kiszka <jan.kiszka@....de>,
	Jason Wessel <jason.wessel@...driver.com>,
	linux-kernel@...r.kernel.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH v7u1 26/31] x86: Don't enable swiotlb if there is not
 enough ram for it

On Fri, Jan 4, 2013 at 2:56 PM, Shuah Khan <shuahkhan@...il.com> wrote:
>
> AMD IOMMU driver is using this lever to leave swiotlb enabled when it
> detects devices that can't be supported by iommu. My concern is that
> this change for kdump removes that handshake ability between iommu and
> swiolb.

No, it does not remove that ability.

I'd like to see the boot log on system that could be affected by this patch.
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