On Mon, 2006-09-04 at 10:02 +0100, Steven Smith wrote:
> > diff -r c859588adc5e -r 72582b968445
> > linux-2.6-xen-sparse/drivers/char/tty_io.c
> > --- a/linux-2.6-xen-sparse/drivers/char/tty_io.c Sat Sep 02 15:31:29
> > 2006 -0400
> > +++ b/linux-2.6-xen-sparse/drivers/char/tty_io.c Sat Sep 02 15:32:38
> > 2006 -0400
>
> It looks to me like this patch makes tty_io.c identical to the
> upstream version. Is this correct?
Yep -- so actually could be removed from the sparse tree. I'm usually
working in a non-sparse tree, so the diff is more relevant.
> > diff -r c859588adc5e -r 72582b968445
> > linux-2.6-xen-sparse/drivers/xen/console/console.c
> > --- a/linux-2.6-xen-sparse/drivers/xen/console/console.c Sat Sep 02
> > 15:31:29 2006 -0400
> > +++ b/linux-2.6-xen-sparse/drivers/xen/console/console.c Sat Sep 02
> > 15:32:38 2006 -0400
> > @@ -663,6 +663,20 @@ static int __init xencons_init(void)
> > printk("Xen virtual console successfully installed as %s%d\n",
> > DRV(xencons_driver)->name, xc_num);
> >
> > + /* Don't need to check about graphical fb for domain 0 */
> > + if (is_initial_xendomain())
> > + return 0;
> > +
> > + rc = 0;
> > + if (xenbus_scanf(XBT_NIL, "console", "use_graphics", "%d", &rc) < 0)
> > + printk(KERN_ERR "Unable to read console/use_graphics\n");
> > + if (rc == 0) {
> > + /* FIXME: this is ugly */
> > + unregister_console(&kcons_info);
> > + kcons_info.flags |= CON_CONSDEV;
> > + register_console(&kcons_info);
> > + }
> > +
> Could you pull the setting of CON_CONSDEV into xen_console_init and
> avoid this weirdness?
Nope -- when consoles are registered, we don't have enough
infrastructure to check xenbus to see if console/use_graphics is set or
not
> This whole passage is a little peculiar, in that you're only going to
> do anything if use_graphics is disabled. I'd expect that just leaving
> the current behaviour alone would be the correct thing to do in that
> case.
>
> Also, why do you need to set CON_CONSDEV at all?
Otherwise, you don't get kernel console messages.
Realistically, I think the better longer-term answer is to create an
early xenconsole -- then, when we do this later initialization, we can
deregister the early console and do the right registration for the
"real" console. This mirrors pretty closely what's done on a few other
arches
Jeremy
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