Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [ 07/46] doc, xen: Mention earlyprintk=xen in the documentation. | Date | Fri, 1 Mar 2013 11:44:55 -0800 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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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
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