From: Paul Brook <paul@codesourcery.com>
To: Jamie Lokier <jamie@shareable.org>
Cc: Cam Macdonell <cam@cs.ualberta.ca>,
qemu-devel@nongnu.org, kvm@vger.kernel.org,
Avi Kivity <avi@redhat.com>
Subject: Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device
Date: Wed, 10 Mar 2010 00:03:38 +0000 [thread overview]
Message-ID: <201003100003.38612.paul@codesourcery.com> (raw)
In-Reply-To: <20100309201243.GH11042@shareable.org>
> > In a cross environment that becomes extremely hairy. For example the x86
> > architecture effectively has an implicit write barrier before every
> > store, and an implicit read barrier before every load.
>
> Btw, x86 doesn't have any implicit barriers due to ordinary loads.
> Only stores and atomics have implicit barriers, afaik.
As of March 2009[1] Intel guarantees that memory reads occur in order (they
may only be reordered relative to writes). It appears AMD do not provide this
guarantee, which could be an interesting problem for heterogeneous migration..
Paul
[*] The most recent docs I have handy. Up to and including Core-2 Duo.
next prev parent reply other threads:[~2010-03-10 0:03 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-05 23:52 [Qemu-devel] [PATCH] Support adding a file to qemu's ram allocation Cam Macdonell
2010-03-05 23:52 ` [Qemu-devel] [PATCH] Inter-VM shared memory PCI device Cam Macdonell
2010-03-07 22:53 ` 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 ` 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 [this message]
2010-03-10 4:38 ` Cam Macdonell
2010-03-10 9:29 ` Avi Kivity
2010-03-10 11:13 ` 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 ` [Qemu-devel] " 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 ` [Qemu-devel] " Cam Macdonell
2010-03-09 17:28 ` [Qemu-devel] " 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
2010-03-11 13:07 ` Avi Kivity
2010-03-11 14:32 ` Arnd Bergmann
2010-03-08 9:53 ` [Qemu-devel] Re: [PATCH] Support adding a file to qemu's ram allocation Avi Kivity
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