[Xen-devel] Re: specifying evtchn ports?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 12 Oct 2005, at 01:04, King, Steven R wrote:

> Is the intent that userland cannot specify an event channel port 
> number?
> If so, is xen-store the proper way to communicate a port value between
> domains?  The latest event channel code appears to always allocate a
> free port on behalf of the caller for both sides of an interdomain
> channel.  Older versions allowed the unbound end to specify a port
> number.
Correct, alloc_unbound() and bind_interdomain() both now allocate one 
port on behalf of the caller. The caller cannot specify which port that 
is.
> Regarding port types:
>
> Xen uniformly uses "int" for ports and computes port numbers < 0 as
> invalid.  This is all great.  Userland code could be more consistent by
> also using "int" throughout.  Using u32 throughout usermode creates
> problems for functions with overloaded +port/-error return values.  Any
> interest here?
I guess. There isn't much userland code to modify now. There isn;t much 
evtchn code left in libxenctrl.
 -- Keir


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