From: Andi Kleen <andi@firstfloor.org>
To: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
muli@il.ibm.com, alexisb@us.ibm.com
Subject: Re: [PATCH 0/2] x86: per-device dma_mapping_ops
Date: Thu, 15 May 2008 11:30:12 +0200 [thread overview]
Message-ID: <482C02A4.80101@firstfloor.org> (raw)
In-Reply-To: <20080515181619R.tomof@acm.org>
FUJITA Tomonori wrote:
> On Thu, 15 May 2008 11:01:09 +0200
> Andi Kleen <andi@firstfloor.org> wrote:
>
>> FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> writes:
>>
>>> This patchset adds per-device dma_mapping_ops support for
>>> CONFIG_X86_64 like POWER architecture does. This change enables us to
>>> cleanly fix the Calgary IOMMU issue that some devices are not behind
>>> the IOMMU [1]. It also would be helpful to handle KVM PCI passthrough.
>> This makes it basically impossible to do stack ops, which some
>> people have been doing.
>
> Seems that I misunderstand what those people want.
>
> What those people want to do and how the stack ops achieve it? Or can
> you tell me where their patches are?
I've seen it in two cases: first was for KVM IO bypass and the other was a
(unfinished) patch to support the NoDMA bitmaps on some systems.
In this case you really want to do a wrapper around the existing ops
and extend the mapping.
That worked fine by just replacing the global pointer, but will
be quite hard in your set up.
-Andi
next prev parent reply other threads:[~2008-05-15 9:31 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-13 6:04 [PATCH 0/2] x86: per-device dma_mapping_ops FUJITA Tomonori
2008-05-13 6:04 ` [PATCH 1/2] add the device argument to dma_mapping_error FUJITA Tomonori
2008-05-13 6:04 ` [PATCH 2/2] x86: per-device dma_mapping_ops support FUJITA Tomonori
2008-05-14 5:55 ` Muli Ben-Yehuda
2008-05-15 20:45 ` Yinghai Lu
2008-05-16 3:44 ` FUJITA Tomonori
2008-05-13 15:39 ` [PATCH 1/2] add the device argument to dma_mapping_error Randy Dunlap
2008-05-15 1:12 ` FUJITA Tomonori
2008-05-14 5:49 ` [PATCH 0/2] x86: per-device dma_mapping_ops Muli Ben-Yehuda
2008-05-15 1:12 ` FUJITA Tomonori
2008-05-15 2:00 ` Alexis Bruemmer
2008-05-15 2:30 ` FUJITA Tomonori
2008-05-15 18:21 ` Alexis Bruemmer
2008-05-15 15:17 ` Muli Ben-Yehuda
2008-05-15 15:15 ` Muli Ben-Yehuda
2008-05-15 9:01 ` Andi Kleen
2008-05-15 9:16 ` FUJITA Tomonori
2008-05-15 9:30 ` Andi Kleen [this message]
2008-05-15 9:41 ` FUJITA Tomonori
2008-05-15 10:48 ` Andi Kleen
2008-05-15 15:32 ` Muli Ben-Yehuda
2008-05-16 3:44 ` FUJITA Tomonori
2008-05-16 5:24 ` Andi Kleen
2008-05-19 6:32 ` FUJITA Tomonori
2008-05-15 15:26 ` Muli Ben-Yehuda
2008-05-15 21:03 ` Andi Kleen
2008-05-15 21:39 ` Muli Ben-Yehuda
2008-05-15 21:45 ` Andi Kleen
2008-05-15 21:53 ` Muli Ben-Yehuda
2008-05-15 22:05 ` Muli Ben-Yehuda
2008-05-15 18:25 ` Alexis Bruemmer
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