RE: [Xen-devel] consoleio_read in domU

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

 > Hello,
> I have ported a kernel named toppers on xen as domU using 
> mini-os libraries. 
> This OS use serial link for display and input. 
> For printing messages I use the hypercall console_io with the 
> consolio_write parameter.
> For reading the console input I wanted to use the same 
> hypercall with consolio_read parameter.

That's not really inteneded to be an option for guests other than domain
0 -- you're supposed to use the 'proper' console mechanism using the
ring buffer.

Getting the ring buffer mechanism going would certainly be the best way
of proceeding. Alternatively, I guess you could hack your version of xen
to hand the serial console off to another guest.

Ian

> But I don't well understand how console sharing works on xen. 
> Because, In order to call this function I need first an event 
> from event channel. So, on initializing, I bind VIRQ_CONSOLE 
> with my handler and then I use the hypercall to get the 
> message on my buffer. But the handler is never called. How 
> should I proceed ?
> 
> my initialize function where I have replaced the serial 
> initialize by a bind_virq :
> 
> void
> serial_initialize(VP_INT portid)
> {
> static char buf[]="Initializing serial interface";
>     static char buf2[]=" OK\n";
> (void)HYPERVISOR_console_io(CONSOLEIO_write,strlen(buf), buf);
>     bind_virq(VIRQ_CONSOLE, &serial_handler);
>     (void)HYPERVISOR_console_io(CONSOLEIO_write,strlen(buf2), buf2); }
> 
> my handler which prints something if it is called :
> 
> void
> serial_handler(void)
> {
>     //hw_serial_handler();
>     static char buf[]="character received";
>     (void)HYPERVISOR_console_io(CONSOLEIO_write,strlen(buf), buf); }
> 
> 
> 
> could someone help me please ?
> 
> 

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