From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759855Ab3BYUy0 (ORCPT ); Mon, 25 Feb 2013 15:54:26 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:33518 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753717Ab3BYUyT (ORCPT ); Mon, 25 Feb 2013 15:54:19 -0500 From: Konrad Rzeszutek Wilk To: linux-kernel@vger.kernel.org, hpa@zytor.com, gregkh@linuxfoundation.org, x86@kernel.org Cc: Konrad Rzeszutek Wilk Subject: [PATCH 1/3] xen/documentation: Mention 'earlyprintk=xen' in the documentation. Date: Mon, 25 Feb 2013 15:54:08 -0500 Message-Id: <1361825650-14031-2-git-send-email-konrad.wilk@oracle.com> X-Mailer: git-send-email 1.8.0.2 In-Reply-To: <1361825650-14031-1-git-send-email-konrad.wilk@oracle.com> References: <1361825650-14031-1-git-send-email-konrad.wilk@oracle.com> X-Source-IP: acsinet21.oracle.com [141.146.126.237] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The earlyprintk for Xen PV guests utilizes a simple hypercall (console_io) to provide output to Xen emergency console. Note that the Xen hypervisor should be booted with 'loglevel=all' to output said information. Reported-by: H. Peter Anvin Signed-off-by: Konrad Rzeszutek Wilk --- Documentation/kernel-parameters.txt | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 7660877..73d51ed 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -757,6 +757,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. earlyprintk= [X86,SH,BLACKFIN] earlyprintk=vga + earlyprintk=xen earlyprintk=serial[,ttySn[,baudrate]] earlyprintk=ttySn[,baudrate] earlyprintk=dbgp[debugController#] @@ -774,6 +775,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. The VGA output is eventually overwritten by the real console. + The xen output can only be used by Xen PV guests. + ekgdboc= [X86,KGDB] Allow early kernel console debugging ekgdboc=kbd -- 1.8.0.2