From: Jamie Lokier <jamie@shareable.org>
To: qemu-devel@nongnu.org
Cc: Andrea Arcangeli <aarcange@redhat.com>,
chrisw@redhat.com, avi@redhat.com,
Gerd Hoffmann <kraxel@redhat.com>,
kvm@vger.kernel.org
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: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-12 18:16 [PATCH 0 of 5] dma api v3 Andrea Arcangeli
2008-12-12 18:16 ` [PATCH 1 of 5] fix cpu_physical_memory len Andrea Arcangeli
2008-12-12 19:06 ` Anthony Liguori
2008-12-12 19:26 ` Andrea Arcangeli
2008-12-12 18:16 ` [PATCH 2 of 5] add can_dma/post_dma for direct IO Andrea Arcangeli
2008-12-12 19:00 ` [Qemu-devel] " 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 ` 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 ` [Qemu-devel] " 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 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 ` [Qemu-devel] " 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 ` [PATCH 3 of 5] rename dma.c to isa_dma.c Andrea Arcangeli
2008-12-12 18:16 ` [PATCH 4 of 5] dma api Andrea Arcangeli
2008-12-12 18:55 ` [Qemu-devel] " Blue Swirl
2008-12-12 18:16 ` [PATCH 5 of 5] bdrv_aio_readv/writev Andrea Arcangeli
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=20081214173001.GC28984@shareable.org \
--to=jamie@shareable.org \
--cc=aarcange@redhat.com \
--cc=avi@redhat.com \
--cc=chrisw@redhat.com \
--cc=kraxel@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=qemu-devel@nongnu.org \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.