From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
To: andi@firstfloor.org
Cc: fujita.tomonori@lab.ntt.co.jp, 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 18:41:26 +0900 [thread overview]
Message-ID: <20080515184126O.tomof@acm.org> (raw)
In-Reply-To: <482C02A4.80101@firstfloor.org>
On Thu, 15 May 2008 11:30:12 +0200
Andi Kleen <andi@firstfloor.org> wrote:
> 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.
Thanks,
I thought that KVM people want to do it per device (in the first
case). So with my patchse, they can replace the dma_ops pointer in
dev_archdata with what they want.
next prev parent reply other threads:[~2008-05-15 9:44 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
2008-05-15 9:41 ` FUJITA Tomonori [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20080515184126O.tomof@acm.org \
--to=fujita.tomonori@lab.ntt.co.jp \
--cc=akpm@linux-foundation.org \
--cc=alexisb@us.ibm.com \
--cc=andi@firstfloor.org \
--cc=linux-kernel@vger.kernel.org \
--cc=muli@il.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).