[Xen-devel] error binding to event channel

[Jacob Gorm Hansen <jacobg@xxxxxxx>]

hi,
I am trying to bind an event channel to my domain using the following code:

#include "xc.h"

int main()
{
    int xc_handle = xc_interface_open();
    int p1=0;
    int p2=0;
    int r;

    r = xc_evtchn_alloc_unbound(xc_handle,
                            1,
                            &p2);
    printf("%d ports %d %d\n", r,p1,p2);

    r = xc_evtchn_bind_interdomain(xc_handle,
            DOMID_SELF,1,
            &p1,&p2);

    printf("%d ports %d %d\n", r,p1,p2);
    r = xc_evtchn_send(xc_handle, p1);
    printf("send %d\n", r);

    return 0;
}

On a freshly booted Xen with one domU that works, printing:

0 ports 0 14
0 ports 15 14
send 0

however, the next time I run it I get:

0 ports 0 16
-1 ports 0 16
send -1


The bind_interdomain hypercall fails in Xen in common/evtchn.c, in the test:

    else if ( port2 >= d2->max_event_channel )
    {
        printk("port2 %d max_event_channel %d\n", 
port2,d2->max_event_channel);
        ERROR_EXIT(-EINVAL);
    }

The printk I have added prints:

(XEN) port2 16 max_event_channel 16


-- In general, max_event_channel seems to stop being increased after the 
first bind call. What am I doing wrong here?
thanks,
Jacob


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