doc, xen: Mention 'earlyprintk=xen' in the documentation.
authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Mon, 25 Feb 2013 20:54:08 +0000 (15:54 -0500)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 3 Mar 2013 22:06:38 +0000 (06:06 +0800)
commit938987dc41c19b1683934e0d4e75ae9b04456b80
tree23bd7ae0f2595255fc60d0d19d22c7720755ab71
parent92916fb21cc71f7877c06ab998728f118e2d72cb
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 <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