linux-kernel - Re: EFI and multiboot2 devlopment work for Xen

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Message-ID: <20131022160146.GH3626@debian70-amd64.local.net-space.pl>
Date:	Tue, 22 Oct 2013 18:01:46 +0200
From:	Daniel Kiper <daniel.kiper@...cle.com>
To:	"Woodhouse, David" <david.woodhouse@...el.com>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jan Beulich <JBeulich@...e.com>,
	Ian Campbell <ian.campbell@...rix.com>,
	"ross.philipson@...rix.com" <ross.philipson@...rix.com>,
	"stefano.stabellini@...citrix.com" <stefano.stabellini@...citrix.com>,
	"grub-devel@....org" <grub-devel@....org>,
	"Maliszewski, Richard L" <richard.l.maliszewski@...el.com>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"boris.ostrovsky@...cle.com" <boris.ostrovsky@...cle.com>,
	Peter Jones <pjones@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"keir@....org" <keir@....org>
Subject: Re: EFI and multiboot2 devlopment work for Xen

On Tue, Oct 22, 2013 at 03:42:42PM +0000, Woodhouse, David wrote:
> On Tue, 2013-10-22 at 16:32 +0100, Matthew Garrett wrote:
> >
> > There are two problems with this:
> >
> > 1) The kernel will only boot if it's signed with a key in db, not a key
> > in MOK.
> > 2) grub will read the kernel, but the kernel will have to read the
> > initramfs using EFI calls. That means your initramfs must be on a FAT
> > partition.
> >
> > If you're happy with those limitations then just use the chainloader
> > command. If you're not, use the linuxefi command.
>
> Well, we're talking about booting the Xen hypervisor aren't we?
>
> So yes, there are reasons the Linux kernel uses the 'boot stub' the way
> it does, but I'm not sure we advocate that Xen should emulate that in
> all its 'glory'?

Right, I think that sensible mixture of multiboot2 protocol (it is needed
to pass at least modules list to Xen; IIRC, linuxefi uses Linux Boot protocol
for it) with extension proposed by Vladimir and something similar to linuxefi
command will solve our problem (I proposed it in my first email). Users which
do not need SB may use upstream GRUB2 and others could use
'multiboot2efi extension'.

Daniel
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