From: Avi Kivity <avi@redhat.com>
To: qemu-devel@nongnu.org
Cc: Andrea Arcangeli <aarcange@redhat.com>,
chrisw@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: Mon, 22 Dec 2008 21:44:06 +0200 [thread overview]
Message-ID: <494FEE06.3040005@redhat.com> (raw)
In-Reply-To: <18767.50158.909778.205969@mariner.uk.xensource.com>
Ian Jackson wrote:
> Avi Kivity writes ("[Qemu-devel] Re: [PATCH 2 of 5] add can_dma/post_dma for direct IO"):
>
>> Newer Xen shouldn't have this problem though; it runs qemu in kernel
>> mode in a dedicated 64-bit domain.
>>
>
> I think there is continued value in being able to emulate a guest
> whose physical address space exceeds the virtual address space in the
> host. The whole assumption that all guest accessible RAM is mapped at
> once, contiguously, is I think wrong.
>
I agree that we shouldn't expect memory to be contiguous, in order to
properly support hotplug. But I see zero value in trying to support
large memory configurations on 32-bit in 2008. This is what 64-bit
systems are for! If Xen has a problem with 64-bit hosts, we can try to
accommodate it, but to have 32-bit qemu/tcg or qemu/kvm support large
address spaces is pointless IMO.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2008-12-22 19:46 UTC|newest]
Thread overview: 111+ 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 ` [Qemu-devel] " Andrea Arcangeli
2008-12-12 18:16 ` [PATCH 1 of 5] fix cpu_physical_memory len Andrea Arcangeli
2008-12-12 18:16 ` [Qemu-devel] " Andrea Arcangeli
2008-12-12 19:06 ` Anthony Liguori
2008-12-12 19:06 ` [Qemu-devel] " Anthony Liguori
2008-12-12 19:26 ` Andrea Arcangeli
2008-12-12 19:26 ` [Qemu-devel] " Andrea Arcangeli
2008-12-12 18:16 ` [PATCH 2 of 5] add can_dma/post_dma for direct IO Andrea Arcangeli
2008-12-12 18:16 ` [Qemu-devel] " Andrea Arcangeli
2008-12-12 19:00 ` Blue Swirl
2008-12-12 19:00 ` Blue Swirl
2008-12-12 19:18 ` Anthony Liguori
2008-12-12 19:18 ` Anthony Liguori
2008-12-12 20:05 ` Blue Swirl
2008-12-12 20:10 ` Anthony Liguori
2008-12-12 20:10 ` Anthony Liguori
2008-12-12 19:15 ` Anthony Liguori
2008-12-12 19:15 ` [Qemu-devel] " Anthony Liguori
2008-12-12 19:37 ` Andrea Arcangeli
2008-12-12 19:37 ` [Qemu-devel] " Andrea Arcangeli
2008-12-12 20:09 ` Anthony Liguori
2008-12-12 20:09 ` [Qemu-devel] " Anthony Liguori
2008-12-12 20:25 ` Gerd Hoffmann
2008-12-12 20:25 ` [Qemu-devel] " Gerd Hoffmann
2008-12-12 19:39 ` Anthony Liguori
2008-12-12 19:39 ` [Qemu-devel] " Anthony Liguori
2008-12-13 9:22 ` Avi Kivity
2008-12-13 9:22 ` Avi Kivity
2008-12-13 16:45 ` Anthony Liguori
2008-12-13 16:45 ` Anthony Liguori
2008-12-13 19:48 ` Avi Kivity
2008-12-13 19:48 ` Avi Kivity
2008-12-13 21:07 ` Anthony Liguori
2008-12-13 21:07 ` Anthony Liguori
2008-12-14 6:03 ` Avi Kivity
2008-12-14 6:03 ` Avi Kivity
2008-12-14 19:10 ` Anthony Liguori
2008-12-14 19:10 ` Anthony Liguori
2008-12-14 19:49 ` Avi Kivity
2008-12-14 19:49 ` Avi Kivity
2008-12-14 23:08 ` Anthony Liguori
2008-12-14 23:08 ` Anthony Liguori
2008-12-15 0:57 ` Paul Brook
2008-12-15 0:57 ` Paul Brook
2008-12-15 2:09 ` Anthony Liguori
2008-12-15 2:09 ` Anthony Liguori
2008-12-15 6:23 ` Avi Kivity
2008-12-15 6:23 ` Avi Kivity
2008-12-15 18:35 ` Blue Swirl
2008-12-15 18:35 ` Blue Swirl
2008-12-15 22:06 ` Anthony Liguori
2008-12-15 22:06 ` Anthony Liguori
2008-12-16 9:41 ` Avi Kivity
2008-12-16 9:41 ` Avi Kivity
2008-12-16 16:55 ` Blue Swirl
2008-12-16 16:55 ` Blue Swirl
2008-12-16 17:09 ` Avi Kivity
2008-12-16 17:09 ` Avi Kivity
2008-12-16 17:48 ` Anthony Liguori
2008-12-16 17:48 ` Anthony Liguori
2008-12-16 18:11 ` Blue Swirl
2008-12-16 18:11 ` Blue Swirl
2008-12-16 15:57 ` Blue Swirl
2008-12-16 15:57 ` Blue Swirl
2008-12-16 16:29 ` Paul Brook
2008-12-16 16:29 ` Paul Brook
2008-12-16 16:35 ` Blue Swirl
2008-12-16 16:35 ` Blue Swirl
2008-12-14 17:30 ` Jamie Lokier
2008-12-14 17:30 ` Jamie Lokier
2008-12-13 14:39 ` Andrea Arcangeli
2008-12-13 14:39 ` [Qemu-devel] " Andrea Arcangeli
2008-12-13 16:46 ` Anthony Liguori
2008-12-13 16:46 ` [Qemu-devel] " Anthony Liguori
2008-12-13 16:53 ` Andrea Arcangeli
2008-12-13 16:53 ` [Qemu-devel] " Andrea Arcangeli
2008-12-13 17:54 ` Andreas Färber
2008-12-13 21:11 ` Anthony Liguori
2008-12-13 21:11 ` [Qemu-devel] " Anthony Liguori
2008-12-14 16:47 ` Andrea Arcangeli
2008-12-14 16:47 ` [Qemu-devel] " Andrea Arcangeli
2008-12-14 17:01 ` Avi Kivity
2008-12-14 17:01 ` [Qemu-devel] " Avi Kivity
2008-12-14 17:15 ` Andrea Arcangeli
2008-12-14 17:15 ` [Qemu-devel] " Andrea Arcangeli
2008-12-14 19:59 ` Avi Kivity
2008-12-14 19:59 ` [Qemu-devel] " Avi Kivity
2008-12-22 16:44 ` Ian Jackson
2008-12-22 16:44 ` Ian Jackson
2008-12-22 19:44 ` Avi Kivity [this message]
2008-12-23 0:03 ` Thiemo Seufer
2008-12-23 1:02 ` Andrea Arcangeli
2008-12-23 1:02 ` Andrea Arcangeli
2008-12-23 17:31 ` Avi Kivity
2008-12-23 17:31 ` Avi Kivity
2008-12-22 19:46 ` Avi Kivity
2009-01-05 10:27 ` Gerd Hoffmann
2009-01-05 10:27 ` Gerd Hoffmann
2008-12-13 22:47 ` Anthony Liguori
2008-12-13 22:47 ` [Qemu-devel] " Anthony Liguori
2008-12-14 6:07 ` Avi Kivity
2008-12-14 6:07 ` [Qemu-devel] " 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 ` [Qemu-devel] " Andrea Arcangeli
2008-12-12 18:16 ` [PATCH 4 of 5] dma api Andrea Arcangeli
2008-12-12 18:16 ` [Qemu-devel] " Andrea Arcangeli
2008-12-12 18:55 ` Blue Swirl
2008-12-12 18:55 ` Blue Swirl
2008-12-12 18:16 ` [PATCH 5 of 5] bdrv_aio_readv/writev Andrea Arcangeli
2008-12-12 18:16 ` [Qemu-devel] " Andrea Arcangeli
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