From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@citrix.com>
Subject: Re: Design doc of adding ACPI support for arm64 on Xen
 - version 2
Date: Wed, 2 Sep 2015 12:39:42 +0100
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To: Ian Campbell <ian.campbell@citrix.com>, Andrew Turner <andrew@fubar.geek.nz>
Cc: Hangaohuai <hangaohuai@huawei.com>, "Huangpeng (Peter)" <peter.huangpeng@huawei.com>, xen-devel <xen-devel@lists.xen.org>, Stefano Stabellini <stefano.stabellini@citrix.com>, Shannon Zhao <shannon.zhao@linaro.org>, Jan Beulich <jbeulich@suse.com>, Shannon Zhao <zhaoshenglong@huawei.com>, Parth Dixit <parth.dixit@linaro.org>, Christoffer Dall <christoffer.dall@linaro.org>
List-Id: xen-devel@lists.xenproject.org

Hi Ian,

On 02/09/15 12:30, Ian Campbell wrote:
>> Although, when running on Xen, FreeBSD is creating a Xen console by
>> default with the higher priority. It will be grabbed by FreeBSD as the
>> default one.
> 
> ... Linux should be doing the same. The problem is that the existing code
> to call add_preferred_console doesn't happen early enough on ARM
> 
> Someone (you? Ard? Stefano?) has a patch to move Xen detection in Linux
> earlier ages ago, but I think it failed to actually get in.

The patch is present in Linux 4.2:

commit f1dddd118c555508ce383b7262f4e6440927bdf4
Author: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date:   Wed May 6 14:14:22 2015 +0000

    xen/arm: allow console=hvc0 to be omitted for guests
    
    From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
    
    This patch registers hvc0 as the preferred console if no console
    has been specified explicitly on the kernel command line.
    
    The purpose is to allow platform agnostic kernels and boot images
    (such as distro installers) to boot in a Xen/ARM domU without the
    need to modify the command line by hand.
    
    Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
    Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
    Reviewed-by: Julien Grall <julien.grall@linaro.org>


-- 
Julien Grall