Re: [Xen-devel] Linux Dom0 console handling (again)

[Jan Beulich]

>>> On 12.04.18 at 19:56,  wrote:
> On 04/12/2018 04:06 AM, Jan Beulich wrote:
>> Jürgen, Boris,
>>
>> looks like commit 47b02f4c62 ("x86/xen: add tty0 and hvc0 as
>> preferred consoles for dom0") doesn't get us quite there yet - non-
>> kernel boot output (and a console prompt) still doesn't appear on
>> the screen. 
> 
> 
> Hmm.. I get both kernel and systemd output, as well as console prompt,
> on both serial and screen.
> 
> Is there a specific set of console-related boot options that causes this
> problem?

None at all, but I'm observing this on an older distro (not systemd based).

Jan


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Re: [Xen-devel] Linux Dom0 console handling (again)

[Boris Ostrovsky]

On 04/12/2018 04:06 AM, Jan Beulich wrote:
> Jürgen, Boris,
>
> looks like commit 47b02f4c62 ("x86/xen: add tty0 and hvc0 as
> preferred consoles for dom0") doesn't get us quite there yet - non-
> kernel boot output (and a console prompt) still doesn't appear on
> the screen. 


Hmm.. I get both kernel and systemd output, as well as console prompt,
on both serial and screen.

Is there a specific set of console-related boot options that causes this
problem?

-boris


> For now I'm using
>
> --- a/arch/x86/xen/enlighten_pv.c
> +++ b/arch/x86/xen/enlighten_pv.c
> @@ -1409,8 +1409,11 @@ asmlinkage __visible void __init xen_sta
>   xen_boot_params_init_edd();
>   }
>  
> - add_preferred_console("tty", 0, NULL);
> + if (!boot_params.screen_info.orig_video_isVGA)
> + add_preferred_console("tty", 0, NULL);
>   add_preferred_console("hvc", 0, NULL);
> + if (boot_params.screen_info.orig_video_isVGA)
> + add_preferred_console("tty", 0, NULL);
>  
>  #ifdef CONFIG_PCI
>   /* PCI BIOS service won't work from a PV guest. */
>
> but that looks more like a hack, not the least because
> - orig_video_isVGA is always set for Dom0 (independent of whether
>   there actually is any VGA, let alone the question of whether there's
>   any monitor connected),
> - XenoLinux iirc had non-kernel output (but not the prompt) appear
>   on both the screen and the serial console (albeit that may have
>   been only with older Linux, i.e. I'm not certain this not being the
>   case anymore is an effect of the Xen-specific pieces being
>   different).
>
> Thoughts?
>
> Thanks, Jan


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[Xen-devel] Linux Dom0 console handling (again)

[Jan Beulich]

Jürgen, Boris,

looks like commit 47b02f4c62 ("x86/xen: add tty0 and hvc0 as
preferred consoles for dom0") doesn't get us quite there yet - non-
kernel boot output (and a console prompt) still doesn't appear on
the screen. For now I'm using

--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -1409,8 +1409,11 @@ asmlinkage __visible void __init xen_sta
xen_boot_params_init_edd();
}
 
-   add_preferred_console("tty", 0, NULL);
+   if (!boot_params.screen_info.orig_video_isVGA)
+   add_preferred_console("tty", 0, NULL);
add_preferred_console("hvc", 0, NULL);
+   if (boot_params.screen_info.orig_video_isVGA)
+   add_preferred_console("tty", 0, NULL);
 
 #ifdef CONFIG_PCI
/* PCI BIOS service won't work from a PV guest. */

but that looks more like a hack, not the least because
- orig_video_isVGA is always set for Dom0 (independent of whether
  there actually is any VGA, let alone the question of whether there's
  any monitor connected),
- XenoLinux iirc had non-kernel output (but not the prompt) appear
  on both the screen and the serial console (albeit that may have
  been only with older Linux, i.e. I'm not certain this not being the
  case anymore is an effect of the Xen-specific pieces being
  different).

Thoughts?

Thanks, Jan

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