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Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device
From: |
Paul Brook |
Subject: |
Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device |
Date: |
Wed, 10 Mar 2010 00:03:38 +0000 |
User-agent: |
KMail/1.12.4 (Linux/2.6.32-trunk-amd64; KDE/4.3.4; x86_64; ; ) |
> > 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.
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, (continued)
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Avi Kivity, 2010/03/08
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Jamie Lokier, 2010/03/09
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Anthony Liguori, 2010/03/09
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Avi Kivity, 2010/03/10
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Anthony Liguori, 2010/03/10
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Avi Kivity, 2010/03/10
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Paul Brook, 2010/03/10
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Avi Kivity, 2010/03/11
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Paul Brook, 2010/03/11
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Jamie Lokier, 2010/03/09
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device,
Paul Brook <=
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Cam Macdonell, 2010/03/09
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Avi Kivity, 2010/03/10
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Paul Brook, 2010/03/10
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Jamie Lokier, 2010/03/10
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, Nick Piggin, 2010/03/11
- Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device, malc, 2010/03/11
[Qemu-devel] Re: [PATCH] Inter-VM shared memory PCI device, Avi Kivity, 2010/03/08