consoleio_read in domU

consoleio_read in domU

[nicowisamu]

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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.
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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RE: consoleio_read in domU

[Ian Pratt]

 > 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 ?
> 
>