Re: [Xen-devel] [PATCH] xen: use hvc console for dom0

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 02/26/2018 06:08 AM, Juergen Gross wrote:
> Today the hvc console is added as a preferred console for pv domUs
> only. As this requires a boot parameter for getting dom0 messages per
> default add it for dom0, too.
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> ---
>  arch/x86/xen/enlighten_pv.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
> index c047f42552e1..d27740a80c5e 100644
> --- a/arch/x86/xen/enlighten_pv.c
> +++ b/arch/x86/xen/enlighten_pv.c
> @@ -1377,7 +1377,6 @@ asmlinkage __visible void __init xen_start_kernel(void)
>       if (!xen_initial_domain()) {
>               add_preferred_console("xenboot", 0, NULL);
>               add_preferred_console("tty", 0, NULL);
> -             add_preferred_console("hvc", 0, NULL);
>               if (pci_xen)
>                       x86_init.pci.arch_init = pci_xen_init;
>       } else {
> @@ -1410,6 +1409,9 @@ asmlinkage __visible void __init xen_start_kernel(void)
>  
>               xen_boot_params_init_edd();
>       }
> +
> +     add_preferred_console("hvc", 0, NULL);
> +

Won't this prevent dom0 output from showing up on vga console by default?

-boris

>  #ifdef CONFIG_PCI
>       /* PCI BIOS service won't work from a PV guest. */
>       pci_probe &= ~PCI_PROBE_BIOS;


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