linux-kernel - Re: [Xen-devel] Re: [RFC] Make AGP work with IOMMU

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 05 Aug 2009 07:44:56 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Dave Airlie <airlied@...il.com>,
	Keir Fraser <kier.fraser@...citrix.com>,
	xen-devel@...ts.xensource.com, Joerg Roedel <joerg.roedel@....com>,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Zhenyu Wang <zhenyu.z.wang@...el.com>
Subject: Re: [Xen-devel] Re: [RFC] Make AGP work with IOMMU

On Tue, 2009-08-04 at 16:52 -0700, Jeremy Fitzhardinge wrote:
> And just when I have patches to use them for their original purpose...
> 
> Looking back over the thread, are you saying that most users are already
> using the DMA API correctly for AGP accesses?  If that's true then we
> should be just fine.

No, not 'most users'. But perhaps we should.

All we've done so far is make intel-agp use the DMA API correctly. And
that's conditional on CONFIG_DMAR. But we could make it unconditional,
and make the other drivers do it too. The code is all fairly generic.

Without an IOMMU, the overhead would be fairly minimal.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/