From: Arnd Bergmann <arnd@arndb.de>
To: Avi Kivity <avi@redhat.com>
Cc: Cam Macdonell <cam@cs.ualberta.ca>,
qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [PATCH] Inter-VM shared memory PCI device
Date: Thu, 11 Mar 2010 13:57:52 +0100 [thread overview]
Message-ID: <201003111357.53025.arnd@arndb.de> (raw)
In-Reply-To: <4B9892B7.7030605@redhat.com>
On Thursday 11 March 2010, Avi Kivity wrote:
> > A totally different option that avoids this whole problem would
> > be to separate the signalling from the shared memory, making the
> > PCI shared memory device a trivial device with a single memory BAR,
> > and using something a higher-level concept like a virtio based
> > serial line for the actual signalling.
> >
>
> That would be much slower. The current scheme allows for an
> ioeventfd/irqfd short circuit which allows one guest to interrupt
> another without involving their qemus at all.
Yes, the serial line approach would be much slower, but my point
was that we can do signaling over "something else", which could
well be something building on irqfd.
Arnd
next prev parent reply other threads:[~2010-03-11 12:58 UTC|newest]
Thread overview: 48+ 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 ` [PATCH] Inter-VM shared memory PCI device Cam Macdonell
2010-03-07 22:53 ` [Qemu-devel] " Paul Brook
2010-03-08 1:45 ` Jamie Lokier
2010-03-08 9:48 ` Alexander Graf
2010-03-08 9:54 ` Jamie Lokier
2010-03-08 10:57 ` Alexander Graf
2010-03-09 21:41 ` Anthony Liguori
2010-03-08 13:04 ` Paul Brook
2010-03-09 19:00 ` Jamie Lokier
2010-03-08 9:52 ` Avi Kivity
2010-03-08 13:03 ` Paul Brook
2010-03-08 13:16 ` Avi Kivity
2010-03-09 20:11 ` Jamie Lokier
2010-03-09 21:44 ` Anthony Liguori
2010-03-10 9:25 ` Avi Kivity
2010-03-10 17:13 ` [Qemu-devel] " Anthony Liguori
2010-03-10 17:30 ` Avi Kivity
2010-03-10 17:41 ` Paul Brook
2010-03-11 6:33 ` Avi Kivity
2010-03-11 12:21 ` Paul Brook
2010-03-09 20:12 ` Jamie Lokier
2010-03-10 0:03 ` Paul Brook
2010-03-10 4:38 ` Cam Macdonell
2010-03-10 9:29 ` Avi Kivity
2010-03-10 11:13 ` [Qemu-devel] " Paul Brook
2010-03-11 3:10 ` Jamie Lokier
2010-03-11 4:37 ` Nick Piggin
2010-03-11 14:38 ` malc
2010-03-08 9:56 ` Avi Kivity
2010-03-08 17:57 ` Cam Macdonell
2010-03-09 10:29 ` Avi Kivity
[not found] ` <8286e4ee1003090724m1ef0b571g8b705a24e36e1753@mail.gmail.com>
2010-03-09 15:27 ` Cam Macdonell
2010-03-09 17:28 ` Avi Kivity
2010-03-09 17:34 ` Anthony Liguori
2010-03-09 18:34 ` Cam Macdonell
2010-03-10 9:21 ` Avi Kivity
2010-03-10 16:36 ` Cam Macdonell
2010-03-11 6:49 ` Avi Kivity
2010-03-09 12:49 ` Arnd Bergmann
2010-03-09 13:03 ` Avi Kivity
2010-03-09 16:44 ` Cam Macdonell
2010-03-10 14:04 ` Arnd Bergmann
2010-03-11 6:50 ` Avi Kivity
2010-03-11 12:57 ` Arnd Bergmann [this message]
2010-03-11 13:07 ` Avi Kivity
2010-03-11 14:32 ` Arnd Bergmann
2010-03-08 9:53 ` [PATCH] Support adding a file to qemu's ram allocation Avi Kivity
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