Commit 2482a92e authored Feb 25, 2013 by Konrad Rzeszutek Wilk Committed by H. Peter Anvin Feb 25, 2013

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@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


Cc: <stable@vger.kernel.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

parent 565d956a

Documentation/kernel-parameters.txt

+3 −0

Original line number	Diff line number	Diff line
		@@ -754,6 +754,7 @@ 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#]
		@@ -771,6 +772,8 @@ 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