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

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Message-ID: <b57092b4-e740-e1f8-3885-a817bb7d4e70@arm.com>
Date:   Tue, 27 Feb 2018 11:14:23 +0000
From:   Julien Grall <julien.grall@....com>
To:     Juergen Gross <jgross@...e.com>,
        Andrii Anisov <andrii_anisov@...m.com>,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc:     boris.ostrovsky@...cle.com,
        Stefano Stabellini <sstabellini@...nel.org>, jbeulich@...e.com
Subject: Re: [Xen-devel] [PATCH] xen: use hvc console for dom0

Hi,

On 26/02/18 12:32, Juergen Gross wrote:
> On 26/02/18 13:06, Andrii Anisov wrote:
>> 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?
> 
> In case ARM wants something similar I guess the test for
> xen_initial_domain() should be dropped in xen_early_init().
I am pretty sure we discussed to remove !xen_initial_domain() for Arm in 
the past. But I don't remember why the patch was not sent to remove it.

Anyway, I guess this should be fine to have hvc as a preferred console 
for the initial domain as well.

Cheers,

-- 
Julien Grall