Re: passing options to grub in xen,openfirmware and efi

[Olaf Hering <olaf@aepfle.de>]

On Fri, May 08, Andrei Borzenkov wrote:

> On Fri, May 8, 2015 at 2:15 PM, Olaf Hering <olaf@aepfle.de> wrote:
> > On Fri, May 08, Vladimir 'phcoder' Serbinenko wrote:
> >
> >> That's not the plan which is pushed by xen guys. They propose to make grub
> >> stored on dom0 to just load grub from a predefined place in domU. This I.a.
> >> allows easier upgrade of bootloader for distros as they don't have to worry
> >> about dom0 having very old grub.
> > Thats news, where was that proposed and discussed?
> http://xenbits.xen.org/docs/unstable/misc/x86-xenpv-bootloader.html

Where is that implemented anyway? I fail to find code for that in grub2
sources. But as noted elsewhere, this is within the guest. Nothing would
load binaries from the suggested location. And there can be several
disks, each containing the suggested layout. Its still up to the host
admin to start a guest with a given kernel= and extra= from domU.cfg.

But without changes such as
<1431336508-17290-1-git-send-email-olaf@aepfle.de> it will be impossible
for the host admin to load files from a specific disk (be it a disk or a
cdrom). Imagine your PC without the BIOS provided boot menu behind F12
(or whereever), everything would need to go to the first disk.

Olaf