From: Avi Kivity <avi@redhat.com>
To: ncmike@ncultra.org, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Re: Add target memory mapping API
Date: Wed, 21 Jan 2009 14:18:29 +0200 [thread overview]
Message-ID: <49771295.2000203@redhat.com> (raw)
In-Reply-To: <20090121120630.GB12504@silverwood.ncultra.org>
Mike Day wrote:
>> What is the motivation for efficient rmw?
>>
>
> rmw would be good for changing bytes in a device config space, or
> programming an IOMMU. Right now these are not on the critical path but
> they may be soon in some cases. For example imagine an assigned I/O
> device that wants to dynamically map io translations for each DMA.
>
You don't do these with dma, instead you use cpu instructions which go
through cpu_physical_memory_rw().
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2009-01-21 12:18 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-18 19:53 [Qemu-devel] [PATCH 0/5] Direct memory access for devices Avi Kivity
2009-01-18 19:53 ` [Qemu-devel] [PATCH 1/5] Add target memory mapping API Avi Kivity
2009-01-19 13:49 ` Ian Jackson
2009-01-19 14:54 ` Avi Kivity
2009-01-19 15:39 ` Anthony Liguori
2009-01-19 16:18 ` Paul Brook
2009-01-19 16:33 ` Anthony Liguori
2009-01-19 16:39 ` Avi Kivity
2009-01-19 19:15 ` Anthony Liguori
2009-01-20 10:09 ` Avi Kivity
2009-01-19 16:57 ` Ian Jackson
2009-01-19 19:23 ` Anthony Liguori
2009-01-20 10:17 ` Avi Kivity
2009-01-20 14:18 ` Ian Jackson
2009-01-19 16:40 ` Ian Jackson
2009-01-19 17:28 ` Avi Kivity
2009-01-19 17:53 ` Ian Jackson
2009-01-19 18:29 ` Avi Kivity
2009-01-20 14:32 ` Ian Jackson
2009-01-20 17:23 ` Avi Kivity
2009-01-19 18:25 ` Jamie Lokier
2009-01-19 18:43 ` Avi Kivity
2009-01-20 14:49 ` Ian Jackson
2009-01-20 17:42 ` Avi Kivity
2009-01-20 18:08 ` Jamie Lokier
2009-01-20 20:27 ` Avi Kivity
2009-01-21 16:53 ` Ian Jackson
2009-01-21 16:50 ` Ian Jackson
2009-01-21 17:18 ` Avi Kivity
2009-01-21 21:54 ` Anthony Liguori
2009-01-20 14:44 ` Ian Jackson
2009-01-21 12:06 ` [Qemu-devel] " Mike Day
2009-01-21 12:18 ` Avi Kivity [this message]
2009-01-19 15:05 ` [Qemu-devel] [PATCH 1/5] " Gerd Hoffmann
2009-01-19 15:23 ` Avi Kivity
2009-01-19 15:29 ` Avi Kivity
2009-01-19 15:57 ` Gerd Hoffmann
2009-01-19 16:25 ` Avi Kivity
2009-01-19 17:08 ` Ian Jackson
2009-01-19 17:16 ` Avi Kivity
2009-01-19 14:56 ` [Qemu-devel] " Anthony Liguori
2009-01-19 15:03 ` Avi Kivity
2009-01-19 15:49 ` Anthony Liguori
2009-01-19 15:51 ` Avi Kivity
2009-01-20 18:43 ` Anthony Liguori
2009-01-21 17:09 ` Ian Jackson
2009-01-21 18:56 ` [Qemu-devel] " Mike Day
2009-01-21 19:35 ` Avi Kivity
2009-01-21 19:36 ` [Qemu-devel] Re: [PATCH 1/5] " Anthony Liguori
2009-01-22 12:18 ` Ian Jackson
2009-01-22 18:46 ` Anthony Liguori
2009-01-26 12:23 ` Ian Jackson
2009-01-26 18:03 ` Anthony Liguori
2009-01-21 11:52 ` [Qemu-devel] " Mike Day
2009-01-21 12:17 ` Avi Kivity
2009-01-21 17:37 ` Paul Brook
2009-01-18 19:53 ` [Qemu-devel] [PATCH 2/5] Add map client retry notification Avi Kivity
2009-01-19 14:58 ` [Qemu-devel] " Anthony Liguori
2009-01-18 19:53 ` [Qemu-devel] [PATCH 3/5] Vectored block device API Avi Kivity
2009-01-19 16:54 ` Blue Swirl
2009-01-19 17:19 ` Avi Kivity
2009-01-18 19:53 ` [Qemu-devel] [PATCH 4/5] I/O vector helpers Avi Kivity
2009-01-18 19:53 ` [Qemu-devel] [PATCH 5/5] Convert IDE to directly access guest memory Avi Kivity
2009-01-19 16:50 ` [Qemu-devel] [PATCH 0/5] Direct memory access for devices Blue Swirl
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