[tip:x86/urgent] doc, xen: Mention 'earlyprintk=xen' in the documentation.

From: tip-bot for Konrad Rzeszutek Wilk
Date: Mon Feb 25 2013 - 17:14:23 EST

Commit-ID: 2482a92e7d17187301d7313cfe5021b13393a0b4
Gitweb: http://git.kernel.org/tip/2482a92e7d17187301d7313cfe5021b13393a0b4
Author: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
AuthorDate: Mon, 25 Feb 2013 15:54:08 -0500
Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Mon, 25 Feb 2013 13:41:18 -0800

doc, xen: Mention 'earlyprintk=xen' in the documentation.

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 <hpa@xxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1361825650-14031-2-git-send-email-konrad.wilk@xxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
Documentation/kernel-parameters.txt | 3 +++
1 file changed, 3 insertions(+)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 6c72381..c4cc199 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -754,6 +754,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.

earlyprintk= [X86,SH,BLACKFIN]
+ earlyprintk=xen
@@ -771,6 +772,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
The VGA output is eventually overwritten by the real

+ The xen output can only be used by Xen PV guests.
ekgdboc= [X86,KGDB] Allow early kernel console debugging

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