Re: Support for direct inter-VM sockets? Inter-VM shared memory?

[Avi Kivity <avi@redhat.com>]

On 05/20/2010 10:19 PM, Tyler Bletsch wrote:
> I'm interested in moving some research prototypes from Xen to KVM, but 
> there are a few esoteric features I'd need to do this.
>
> First is an efficient mechanism for direct VM-to-VM 
> sockets...something that bypasses the protocol stack and minimizes 
> overhead.  Xen has XenSocket, XenLoop, and others.  I found a few 
> mentions of this idea dating back to 2006*, mostly saying that a few 
> people have done something like this as a one-off, but nothing 
> official has been released.  I haven't found anything like this more 
> recently, though.  Has there been any progress on this front?  
> Ideally, I'd want a character device or a special program that acts as 
> a fast pipe to a different VM.
>
> Second, what about inter-VM shared memory?

Inter-VM shared memory (contributed by Cam, copied) is in the process of 
being merged.  That includes a fast interguest interrupt mechanism 
(using irqfd), so you could easily layer a fast interguest pipe on top 
of that.

It's possible to do a dedicated guest-to-guest channel using virtio and 
a dma engine, but I'm not aware of any efforts in that direction.

-- 
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