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Date: Wed, 29 Apr 2015 18:28:00 +0200
From: Olaf Hering <olaf@aepfle.de>
To: The development of GNU GRUB <grub-devel@gnu.org>
Subject: Re: passing options to grub in xen,openfirmware and efi
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On Wed, Apr 29, Vladimir 'phcoder' Serbinenko wrote:

> There is a standard where to put it. See xen docs

Yes, its like that:
kernel="/usr/whatever/distro/grub.xen"
extra="opt1=val opt2=val"

And grub2 does not grab the cmdline provided via extra=. I think that
providing root=xen/xvdb is the right way to control grub inside the
domU.
In anycase, what the OF does today in its init code is valid and should
stay.  Once I find the time I will do the very same for PV grub.

Olaf