Patchwork [3.5.y.z,extended,stable] Patch "doc, xen: Mention 'earlyprintk=xen' in the documentation." has been added to staging queue

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Submitter Luis Henriques
Date March 4, 2013, 8:49 p.m.
Message ID <>
Download mbox | patch
Permalink /patch/224807/
State New
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Luis Henriques - March 4, 2013, 8:49 p.m.
This is a note to let you know that I have just added a patch titled

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

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



From d8c1ac937bb3a4add22604e180f958e41c687111 Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <>
Date: Mon, 25 Feb 2013 15:54:08 -0500
Subject: [PATCH] doc, xen: Mention 'earlyprintk=xen' in the documentation.

commit 2482a92e7d17187301d7313cfe5021b13393a0b4 upstream.

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 <>
Signed-off-by: H. Peter Anvin <>
Signed-off-by: Luis Henriques <>
 Documentation/kernel-parameters.txt | 3 +++
 1 file changed, 3 insertions(+)



diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index a92c5eb..65f25d7 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -760,6 +760,7 @@  bytes respectively. Such letter suffixes can also be entirely omitted.

 	earlyprintk=	[X86,SH,BLACKFIN]
+			earlyprintk=xen
@@ -777,6 +778,8 @@  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