From: Jamie Lokier <jamie@shareable.org>
To: qemu-devel@nongnu.org
Cc: Andrea Arcangeli <aarcange@redhat.com>,
chrisw@redhat.com, avi@redhat.com, kvm@vger.kernel.org,
Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: [Qemu-devel] Re: [PATCH 2 of 5] add can_dma/post_dma for direct IO
Date: Sun, 14 Dec 2008 17:30:05 +0000 [thread overview]
Message-ID: <20081214173001.GC28984@shareable.org> (raw)
In-Reply-To: <4942BDEE.7020003@codemonkey.ws>
Anthony Liguori wrote:
> Let me clarify this a bit more. The problem we're trying to address
> today is the encapsulating knowledge of phys_ram_base. We want to
> minimize the amount of code that makes any assumptions about
> phys_ram_base. Your current API still accesses phys_ram_base directly
> in the PCI DMA API. The only real improvement compared to the current
> virtio code is that you properly handle MMIO. This is not just about
> layout but this also includes the fact that in the future, guest memory
> could be discontiguous in QEMU (think memory hotplug).
One little extra thing:
What about PCI DMA to another PCI device, not to RAM?
That's not used very often, but it ought to work.
-- Jamie
next prev parent reply other threads:[~2008-12-14 17:30 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-12 18:16 [Qemu-devel] [PATCH 0 of 5] dma api v3 Andrea Arcangeli
2008-12-12 18:16 ` [Qemu-devel] [PATCH 1 of 5] fix cpu_physical_memory len Andrea Arcangeli
2008-12-12 19:06 ` [Qemu-devel] " Anthony Liguori
2008-12-12 19:26 ` Andrea Arcangeli
2008-12-12 18:16 ` [Qemu-devel] [PATCH 2 of 5] add can_dma/post_dma for direct IO Andrea Arcangeli
2008-12-12 19:00 ` Blue Swirl
2008-12-12 19:18 ` Anthony Liguori
2008-12-12 20:05 ` Blue Swirl
2008-12-12 20:10 ` Anthony Liguori
2008-12-12 19:15 ` [Qemu-devel] " Anthony Liguori
2008-12-12 19:37 ` Andrea Arcangeli
2008-12-12 20:09 ` Anthony Liguori
2008-12-12 20:25 ` Gerd Hoffmann
2008-12-12 19:39 ` Anthony Liguori
2008-12-13 9:22 ` Avi Kivity
2008-12-13 16:45 ` Anthony Liguori
2008-12-13 19:48 ` Avi Kivity
2008-12-13 21:07 ` Anthony Liguori
2008-12-14 6:03 ` Avi Kivity
2008-12-14 19:10 ` Anthony Liguori
2008-12-14 19:49 ` Avi Kivity
2008-12-14 23:08 ` Anthony Liguori
2008-12-15 0:57 ` Paul Brook
2008-12-15 2:09 ` Anthony Liguori
2008-12-15 6:23 ` Avi Kivity
2008-12-15 18:35 ` Blue Swirl
2008-12-15 22:06 ` Anthony Liguori
2008-12-16 9:41 ` Avi Kivity
2008-12-16 16:55 ` Blue Swirl
2008-12-16 17:09 ` Avi Kivity
2008-12-16 17:48 ` Anthony Liguori
2008-12-16 18:11 ` Blue Swirl
2008-12-16 15:57 ` Blue Swirl
2008-12-16 16:29 ` Paul Brook
2008-12-16 16:35 ` Blue Swirl
2008-12-14 17:30 ` Jamie Lokier [this message]
2008-12-13 14:39 ` Andrea Arcangeli
2008-12-13 16:46 ` Anthony Liguori
2008-12-13 16:53 ` Andrea Arcangeli
2008-12-13 17:54 ` Andreas Färber
2008-12-13 21:11 ` Anthony Liguori
2008-12-14 16:47 ` Andrea Arcangeli
2008-12-14 17:01 ` Avi Kivity
2008-12-14 17:15 ` Andrea Arcangeli
2008-12-14 19:59 ` Avi Kivity
2008-12-22 16:44 ` Ian Jackson
2008-12-22 19:44 ` Avi Kivity
2008-12-23 0:03 ` Thiemo Seufer
2008-12-23 1:02 ` Andrea Arcangeli
2008-12-23 17:31 ` Avi Kivity
2008-12-22 19:46 ` Avi Kivity
2009-01-05 10:27 ` Gerd Hoffmann
2008-12-13 22:47 ` Anthony Liguori
2008-12-14 6:07 ` Avi Kivity
2008-12-12 18:16 ` [Qemu-devel] [PATCH 3 of 5] rename dma.c to isa_dma.c Andrea Arcangeli
2008-12-12 18:16 ` [Qemu-devel] [PATCH 4 of 5] dma api Andrea Arcangeli
2008-12-12 18:55 ` Blue Swirl
2008-12-12 18:16 ` [Qemu-devel] [PATCH 5 of 5] bdrv_aio_readv/writev Andrea Arcangeli
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