From: Dave Jones <davej@redhat.com>
To: Pavel Vasilyev <pavel@pavlinux.ru>
Cc: linux-kernel@vger.kernel.org
Subject: Re: GART_IOMMU without AGP
Date: Wed, 22 Jul 2009 18:25:01 -0400 [thread overview]
Message-ID: <20090722222501.GA20860@redhat.com> (raw)
In-Reply-To: <200907230158.15417.pavel@pavlinux.ru>
On Thu, Jul 23, 2009 at 01:58:06AM +0400, Pavel Vasilyev wrote:
> On Thursday 23 July 2009 01:37:46 Dave Jones wrote:
> > The lack of AGP slots doesn't mean a lack of AGP bus.
> > It's part of the K8 on-CPU northbridge.
>
> Fine. But if I do not have AGP-card, why do I need the support of bus AGP? :)
> It may allow the user to the toggle on or off when needed.
For those that _do_ have an AGP bus, it's mandatory, as the
aperture needs to be shared between IOMMU and video.
Removing the select creates a potential for people to load video drivers
that don't come with the kernel to corrupt data as soon as something
writes using the IOMMU.
For those that don't have an agp bus, it costs about 20k of code.
Is this really that big a concern ?
Dave
next prev parent reply other threads:[~2009-07-22 22:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-22 15:26 GART_IOMMU without AGP Pavel Vasilyev
2009-07-22 21:37 ` Dave Jones
2009-07-22 21:58 ` Pavel Vasilyev
2009-07-22 22:25 ` Dave Jones [this message]
2009-07-22 22:44 ` Alan Cox
2009-07-22 22:17 ` Alan Cox
2009-07-22 22:28 ` Dave Jones
2009-07-22 23:05 ` Pavel Vasilyev
2009-07-22 22:34 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2009-07-22 23:15 Pavel Vasilyev
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