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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device
Date: Sun, 7 Mar 2010 22:53:59 +0000
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To: qemu-devel@nongnu.org
Cc: Cam Macdonell <cam@cs.ualberta.ca>, kvm@vger.kernel.org

> Support an inter-vm shared memory device that maps a shared-memory object
> as a PCI device in the guest.  This patch also supports interrupts between
> guest by communicating over a unix domain socket.  This patch applies to
>  the qemu-kvm repository.

No. All new devices should be fully qdev based.

I suspect you've also ignored a load of coherency issues, especially when not 
using KVM. As soon as you have shared memory in more than one host 
thread/process you have to worry about memory barriers.

Paul