linux-kernel - Re: [PATCH 0/3] fix GART to respect device's dma

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Message-ID: <87hc8grjuf.fsf@basil.nowhere.org>
Date:	Tue, 16 Sep 2008 02:54:32 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	mingo@...e.hu, joerg.roedel@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] fix GART to respect device's dma_mask about virtual mappings

FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> writes:

> Currently, gart IOMMU ignores device's dma_mask when it does virtual
> mappings. So it could give a device a virtual address that the device
> can't access to.

Huh? That is what the need_iommu() logic in gart_map_sg()
does. An I'm not aware of any bugs in this area.

Did you actually see that failure in practice? I don't see
how it could happen.

-Andi
-- 
ak@...ux.intel.com
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