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[Qemu-devel] Re: [PATCH] qemu/virtio: make wmb compiler barrier + commen
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] Re: [PATCH] qemu/virtio: make wmb compiler barrier + comments |
Date: |
Wed, 11 Nov 2009 11:37:37 +0200 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Wed, Nov 11, 2009 at 01:34:12AM +0000, Paul Brook wrote:
> On Monday 26 October 2009, Michael S. Tsirkin wrote:
> > wmb must be at least a compiler barrier, even without SMP.
>
> Why?
Because virtio code might run on a separate thread from guest.
If compiler reorders writes, guest might see inconsistent data.
--
MST
- Re: [Qemu-devel] [PATCH] qemu/virtio: make wmb compiler barrier + comments, Paul Brook, 2009/11/10
- [Qemu-devel] Re: [PATCH] qemu/virtio: make wmb compiler barrier + comments,
Michael S. Tsirkin <=
- [Qemu-devel] Re: [PATCH] qemu/virtio: make wmb compiler barrier + comments, Paul Brook, 2009/11/11
- [Qemu-devel] Re: [PATCH] qemu/virtio: make wmb compiler barrier + comments, Michael S. Tsirkin, 2009/11/11
- [Qemu-devel] Re: [PATCH] qemu/virtio: make wmb compiler barrier + comments, Paul Brook, 2009/11/11
- [Qemu-devel] Re: [PATCH] qemu/virtio: make wmb compiler barrier + comments, Michael S. Tsirkin, 2009/11/11
- [Qemu-devel] Re: [PATCH] qemu/virtio: make wmb compiler barrier + comments, Paul Brook, 2009/11/11
- [Qemu-devel] Re: [PATCH] qemu/virtio: make wmb compiler barrier + comments, Michael S. Tsirkin, 2009/11/11
- Re: [Qemu-devel] Re: [PATCH] qemu/virtio: make wmb compiler barrier + comments, Paul Brook, 2009/11/11
- Re: [Qemu-devel] Re: [PATCH] qemu/virtio: make wmb compiler barrier + comments, Scott Tsai, 2009/11/11
- Re: [Qemu-devel] Re: [PATCH] qemu/virtio: make wmb compiler barrier + comments, Michael S. Tsirkin, 2009/11/11
- Re: [Qemu-devel] Re: [PATCH] qemu/virtio: make wmb compiler barrier + comments, Michael S. Tsirkin, 2009/11/11