Re: [Xen-devel] back/frontend drivers HelloWorld

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 25 Sep 2005, at 17:24, NAHieu wrote:

> - Is that correct? ( I have some doubts about (2), as I see that the
> drivers available in xen uses xenbus_driver.probe to detect domU's
> driver?)
All correct, but you skip a few details.

In step 1, domU gets the event channel port via EVTCHNOP_alloc_unbound. 
It then writes that port value to xenstore.
In step 2, dom0 binds to the remote event-channel port via 
EVTCHNOP_bind_interdomain. This returns the allocated local port which 
is what is passed to bind_evtchn_to_irqhandler().
See code in drivers/xen/blkback/interface.c for a precise example of 
doing this -- probably best to steal that portion of code as a 
template.
Also, you can find code in blkfront/blkback to allocate a shared page 
in blkfront, allocate a grant reference for it, pass that to blkback 
and map the page thru the grant reference.
 -- Keir


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