From: Christoph Hellwig <hch@infradead.org>
To: Keir Fraser <Keir.Fraser@cl.cam.ac.uk>
Cc: linux-kernel@vger.kernel.org, akpm@osdl.org, riel@redhat.com,
kurt@garloff.de, Ian.Pratt@cl.cam.ac.uk,
Christian.Limpach@cl.cam.ac.uk
Subject: Re: [PATCH] Xen/i386 cleanups - AGP bus/phys cleanups
Date: Wed, 16 Mar 2005 14:31:30 +0000 [thread overview]
Message-ID: <20050316143130.GA21959@infradead.org> (raw)
In-Reply-To: <E1DBX0o-0000sV-00@mta1.cl.cam.ac.uk>
On Wed, Mar 16, 2005 at 11:48:29AM +0000, Keir Fraser wrote:
> This patch cleans up AGP driver treatment of bus/device memory. Every
> use of virt_to_phys/phys_to_virt should properly be converting between
> virtual and bus addresses: this distinction really matters for the Xen
> hypervisor.
It's bogus either way. You must never use virt_to_phys or virt_to_bus
for bus address. For systems with an IOMMU there's no 1:1 mapping.
next prev parent reply other threads:[~2005-03-16 14:32 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-16 11:48 [PATCH] Xen/i386 cleanups - AGP bus/phys cleanups Keir Fraser
2005-03-16 14:31 ` Christoph Hellwig [this message]
2005-03-16 14:58 ` Keir Fraser
2005-03-16 15:01 ` Rik van Riel
2005-03-16 18:10 ` Christoph Hellwig
2005-03-16 18:35 ` Keir Fraser
2005-03-16 18:42 ` Jesse Barnes
2005-03-16 19:08 ` Keir Fraser
2005-03-16 19:06 ` Christoph Hellwig
2005-03-16 19:11 ` Keir Fraser
2005-03-16 17:40 ` Alan Cox
2005-03-16 17:54 ` Jesse Barnes
2005-03-16 21:24 ` Paul Mackerras
2005-03-16 22:06 ` Jesse Barnes
2005-03-16 23:55 ` Rik van Riel
2005-03-17 0:39 ` Paul Mackerras
2005-03-17 1:05 ` Tupshin Harper
2005-03-17 3:44 ` Rik van Riel
2005-03-17 4:42 ` Christoph Hellwig
2005-03-17 4:58 ` Rik van Riel
2005-03-17 9:16 ` Keir Fraser
2005-03-17 9:34 ` Paul Mackerras
2005-03-17 10:56 ` Keir Fraser
2005-03-19 10:07 ` Eric W. Biederman
2005-03-19 10:56 ` Christian Limpach
2005-03-19 13:01 ` Keir Fraser
2005-03-17 13:53 ` Alan Cox
2005-03-18 0:16 ` Paul Mackerras
2005-03-18 4:23 ` Rik van Riel
2005-03-18 9:05 ` Keir Fraser
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