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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
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