[Lguest] Communication between host and guest

[Earlence Fernandes]

so using virtio is it possible to get a bidirectional
stream like connection from host kernel to guest kernel?

I was thinking of setting up communication like this:

1. virtio driver to send data in to guest kernel from host kernel.
2. hypercall to return result of data request from guest kernel to host
kernel.

-Earlence


On Mon, May 27, 2013 at 1:25 AM, Rusty Russell <rusty at rustcorp.com.au>wrote:

> Eviatar Khen <eviatarkhen at gmail.com> writes:
> > Hi,
> > The answer depends on the the type of communication that you need.
> > Generally the Host-Guest are sharing data via the lguest_data structure.
> > Also, the Guest could switch to the host via a hypercall with a return
> > value set by the Host.
> >
> > If you need something more similar to streaming then virtio is your best
> > choice. All other alternatives would probably be more complex.
>
> A rough breakdown looks like this:
> - lguest_data is good for the guest or host publishing small amounts of
>   data, without notification when it changes.
> - A new hcall is good for the guest sending data to the host.
> - A new virtio device is good for more complex uses.
>
> To make a new virtio device, just copy the existing ones.  A device
> usually has some configuration space and one or more virtqueues, where
> the guest published readable or writable buffers, and the host
> reads/fills them.
>
> Cheers,
> Rusty.
>
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