From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933115AbcBYPAU (ORCPT ); Thu, 25 Feb 2016 10:00:20 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:39283 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932218AbcBYPAS (ORCPT ); Thu, 25 Feb 2016 10:00:18 -0500 Subject: Re: [PATCH v2 1/3] hvc_xen: add earlycon support To: Stefano Stabellini , xen-devel@lists.xensource.com References: <1456402239-4179-1-git-send-email-stefano.stabellini@eu.citrix.com> Cc: linux-kernel@vger.kernel.org, david.vrabel@citrix.com, konrad.wilk@oracle.com From: Boris Ostrovsky Message-ID: <56CF16FC.6050609@oracle.com> Date: Thu, 25 Feb 2016 10:00:12 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 MIME-Version: 1.0 In-Reply-To: <1456402239-4179-1-git-send-email-stefano.stabellini@eu.citrix.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 02/25/2016 07:10 AM, Stefano Stabellini wrote: > Introduce EARLYCON support in hvc_xen, useful for early debugging on arm > and arm64, where xen early_printk is not available. > > It is different from xenboot_write_console on x86 in two ways: > > - it does not return if !xen_pv_domain(), not only because ARM guests > are xen_hvm_domain(), but also because we want to capture all the > early boot messages, before xen support is discovered > - it does not try to print to the domU console at all, because xen > support will only be discovered at a later point > > Signed-off-by: Stefano Stabellini Reviewed-by: Boris Ostrovsky