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

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Message-ID: <0d8bdda5-faef-41da-344a-644b5c3d6006@epam.com>
Date:   Mon, 26 Feb 2018 14:06:21 +0200
From:   Andrii Anisov <andrii_anisov@...m.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Cc:     boris.ostrovsky@...cle.com, jbeulich@...e.com
Subject: Re: [Xen-devel] [PATCH] xen: use hvc console for dom0

Hello Juergen,


On 26.02.18 13:08, 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@...e.com>
> ---
>   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
Is this something x86 specific? Could it be a generic approach?

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

-- 

*Andrii Anisov*