| From 2482a92e7d17187301d7313cfe5021b13393a0b4 Mon Sep 17 00:00:00 2001 |
| From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> |
| Date: Mon, 25 Feb 2013 15:54:08 -0500 |
| Subject: doc, xen: Mention 'earlyprintk=xen' in the documentation. |
| |
| From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> |
| |
| 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 <hpa@zytor.com> |
| Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> |
| Link: http://lkml.kernel.org/r/1361825650-14031-2-git-send-email-konrad.wilk@oracle.com |
| Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| Documentation/kernel-parameters.txt | 3 +++ |
| 1 file changed, 3 insertions(+) |
| |
| --- a/Documentation/kernel-parameters.txt |
| +++ b/Documentation/kernel-parameters.txt |
| @@ -742,6 +742,7 @@ bytes respectively. Such letter suffixes |
| |
| earlyprintk= [X86,SH,BLACKFIN] |
| earlyprintk=vga |
| + earlyprintk=xen |
| earlyprintk=serial[,ttySn[,baudrate]] |
| earlyprintk=ttySn[,baudrate] |
| earlyprintk=dbgp[debugController#] |
| @@ -759,6 +760,8 @@ bytes respectively. Such letter suffixes |
| 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 |
| |
