Re: Using VMChannel to communicate with the host.

[Troy Benjegerdes <hozer-TBByXz/9jYzYtjvyW6yDsg@public.gmane.org>]

On Fri, Sep 07, 2007 at 04:44:30PM -0600, Cam Macdonell wrote:
> 
> Hi,
> 
> I'm trying to get a better understanding of VM-to-host communication 
> that doesn't involve going over virtual networks.  I understand there 
> are a couple of developments underway, but I just want to play around a 
> better sense of things.   I think the current hypercall mechanism is the 
> current way to do this using the -vmchannel option.  But, I'm not very 
> experienced with PCI devices and their drivers so I need some help.  All 
> I want to do is to communicate across a unix domain socket on the host. 
>   Besides loading the hypercall module in the guest how do things needs 
> to be configured on the host?
> 
> Is there a simple tutorial or just a webpage with examples for how to do 
> this?

I'm going to suggest that a better way to do VM-to-host or VM-to-VM
communication would be to write an OpenFabrics (www.openfabrics.org)
driver that uses hypercalls. There is probably some gotcha I am not
aware of, but I think this would allow direct userspace to userspace
communication between a process running on a host, and a process running
on a VM, while still maintaining isolation.

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