From: Jamie Lokier <jamie@shareable.org>
To: Alexander Graf <agraf@suse.de>
Cc: Paul Brook <paul@codesourcery.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
Cam Macdonell <cam@cs.ualberta.ca>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device
Date: Mon, 8 Mar 2010 09:54:56 +0000 [thread overview]
Message-ID: <20100308095456.GC2869@shareable.org> (raw)
In-Reply-To: <852A0015-DEAB-4FEF-862B-FDE35AEC9820@suse.de>
Alexander Graf wrote:
> Or we could put in some code that tells the guest the host shm
> architecture and only accept x86 on x86 for now. If anyone cares for
> other combinations, they're free to implement them.
>
> Seriously, we're looking at an interface designed for kvm here. Let's
> please keep it as simple and fast as possible for the actual use case,
> not some theoretically possible ones.
The concern is that a perfectly working guest image running on kvm,
the guest being some OS or app that uses this facility (_not_ a
kvm-only guest driver), is later run on qemu on a different host, and
then mostly works except for some silent data corruption.
That is not a theoretical scenario.
Well, the bit with this driver is theoretical, obviously :-)
But not the bit about moving to a different host.
-- Jamie
WARNING: multiple messages have this Message-ID (diff)
From: Jamie Lokier <jamie@shareable.org>
To: Alexander Graf <agraf@suse.de>
Cc: Cam Macdonell <cam@cs.ualberta.ca>,
Paul Brook <paul@codesourcery.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device
Date: Mon, 8 Mar 2010 09:54:56 +0000 [thread overview]
Message-ID: <20100308095456.GC2869@shareable.org> (raw)
In-Reply-To: <852A0015-DEAB-4FEF-862B-FDE35AEC9820@suse.de>
Alexander Graf wrote:
> Or we could put in some code that tells the guest the host shm
> architecture and only accept x86 on x86 for now. If anyone cares for
> other combinations, they're free to implement them.
>
> Seriously, we're looking at an interface designed for kvm here. Let's
> please keep it as simple and fast as possible for the actual use case,
> not some theoretically possible ones.
The concern is that a perfectly working guest image running on kvm,
the guest being some OS or app that uses this facility (_not_ a
kvm-only guest driver), is later run on qemu on a different host, and
then mostly works except for some silent data corruption.
That is not a theoretical scenario.
Well, the bit with this driver is theoretical, obviously :-)
But not the bit about moving to a different host.
-- Jamie
next prev parent reply other threads:[~2010-03-08 9:55 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-05 23:52 [PATCH] Support adding a file to qemu's ram allocation Cam Macdonell
2010-03-05 23:52 ` [Qemu-devel] " Cam Macdonell
2010-03-05 23:52 ` [PATCH] Inter-VM shared memory PCI device Cam Macdonell
2010-03-05 23:52 ` [Qemu-devel] " Cam Macdonell
2010-03-07 22:53 ` Paul Brook
2010-03-08 1:45 ` Jamie Lokier
2010-03-08 1:45 ` Jamie Lokier
2010-03-08 9:48 ` Alexander Graf
2010-03-08 9:48 ` Alexander Graf
2010-03-08 9:54 ` Jamie Lokier [this message]
2010-03-08 9:54 ` Jamie Lokier
2010-03-08 10:57 ` Alexander Graf
2010-03-08 10:57 ` Alexander Graf
2010-03-09 21:41 ` Anthony Liguori
2010-03-09 21:41 ` Anthony Liguori
2010-03-08 13:04 ` Paul Brook
2010-03-08 13:04 ` Paul Brook
2010-03-09 19:00 ` Jamie Lokier
2010-03-09 19:00 ` Jamie Lokier
2010-03-08 9:52 ` Avi Kivity
2010-03-08 9:52 ` Avi Kivity
2010-03-08 13:03 ` Paul Brook
2010-03-08 13:03 ` Paul Brook
2010-03-08 13:16 ` Avi Kivity
2010-03-08 13:16 ` Avi Kivity
2010-03-09 20:11 ` Jamie Lokier
2010-03-09 20:11 ` Jamie Lokier
2010-03-09 21:44 ` Anthony Liguori
2010-03-09 21:44 ` [Qemu-devel] " Anthony Liguori
2010-03-10 9:25 ` Avi Kivity
2010-03-10 9:25 ` [Qemu-devel] " Avi Kivity
2010-03-10 17:13 ` Anthony Liguori
2010-03-10 17:13 ` Anthony Liguori
2010-03-10 17:30 ` Avi Kivity
2010-03-10 17:30 ` Avi Kivity
2010-03-10 17:41 ` Paul Brook
2010-03-10 17:41 ` Paul Brook
2010-03-11 6:33 ` Avi Kivity
2010-03-11 6:33 ` Avi Kivity
2010-03-11 12:21 ` Paul Brook
2010-03-11 12:21 ` Paul Brook
2010-03-09 20:12 ` Jamie Lokier
2010-03-09 20:12 ` Jamie Lokier
2010-03-10 0:03 ` Paul Brook
2010-03-10 0:03 ` Paul Brook
2010-03-10 4:38 ` Cam Macdonell
2010-03-10 4:38 ` [Qemu-devel] " Cam Macdonell
2010-03-10 9:29 ` Avi Kivity
2010-03-10 9:29 ` [Qemu-devel] " Avi Kivity
2010-03-10 11:13 ` Paul Brook
2010-03-10 11:13 ` Paul Brook
2010-03-11 3:10 ` Jamie Lokier
2010-03-11 3:10 ` Jamie Lokier
2010-03-11 4:37 ` Nick Piggin
2010-03-11 4:37 ` Nick Piggin
2010-03-11 14:38 ` malc
2010-03-11 14:38 ` [Qemu-devel] " malc
2010-03-08 9:56 ` Avi Kivity
2010-03-08 9:56 ` [Qemu-devel] " Avi Kivity
2010-03-08 17:57 ` Cam Macdonell
2010-03-08 17:57 ` [Qemu-devel] " Cam Macdonell
2010-03-09 10:29 ` Avi Kivity
2010-03-09 10:29 ` [Qemu-devel] " Avi Kivity
[not found] ` <8286e4ee1003090724m1ef0b571g8b705a24e36e1753@mail.gmail.com>
2010-03-09 15:27 ` Cam Macdonell
2010-03-09 15:27 ` [Qemu-devel] " Cam Macdonell
2010-03-09 17:28 ` Avi Kivity
2010-03-09 17:28 ` [Qemu-devel] " Avi Kivity
2010-03-09 17:34 ` Anthony Liguori
2010-03-09 17:34 ` [Qemu-devel] " Anthony Liguori
2010-03-09 18:34 ` Cam Macdonell
2010-03-09 18:34 ` [Qemu-devel] " Cam Macdonell
2010-03-10 9:21 ` Avi Kivity
2010-03-10 9:21 ` [Qemu-devel] " Avi Kivity
2010-03-10 16:36 ` Cam Macdonell
2010-03-10 16:36 ` [Qemu-devel] " Cam Macdonell
2010-03-11 6:49 ` Avi Kivity
2010-03-11 6:49 ` [Qemu-devel] " Avi Kivity
2010-03-09 12:49 ` Arnd Bergmann
2010-03-09 12:49 ` [Qemu-devel] " Arnd Bergmann
2010-03-09 13:03 ` Avi Kivity
2010-03-09 13:03 ` [Qemu-devel] " Avi Kivity
2010-03-09 16:44 ` Cam Macdonell
2010-03-09 16:44 ` [Qemu-devel] " Cam Macdonell
2010-03-10 14:04 ` Arnd Bergmann
2010-03-10 14:04 ` [Qemu-devel] " Arnd Bergmann
2010-03-11 6:50 ` Avi Kivity
2010-03-11 6:50 ` [Qemu-devel] " Avi Kivity
2010-03-11 12:57 ` Arnd Bergmann
2010-03-11 12:57 ` [Qemu-devel] " Arnd Bergmann
2010-03-11 13:07 ` Avi Kivity
2010-03-11 13:07 ` [Qemu-devel] " Avi Kivity
2010-03-11 14:32 ` Arnd Bergmann
2010-03-11 14:32 ` [Qemu-devel] " Arnd Bergmann
2010-03-08 9:53 ` [PATCH] Support adding a file to qemu's ram allocation Avi Kivity
2010-03-08 9:53 ` [Qemu-devel] " Avi Kivity
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