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

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Message-ID: <1382458083.18283.34.camel@hastur.hellion.org.uk>
Date:	Tue, 22 Oct 2013 17:08:03 +0100
From:	Ian Campbell <ian.campbell@...rix.com>
To:	Daniel Kiper <daniel.kiper@...cle.com>
CC:	"Woodhouse, David" <david.woodhouse@...el.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"Jan Beulich" <JBeulich@...e.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, 2013-10-22 at 18:01 +0200, Daniel Kiper wrote:
> 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'.

Are you (going to be) in Edinburgh? Matthew was just explaining a bunch
of this stuff to me, it might be useful for you to get it from the
horses mouth instead of laundered through my brain (which is a bit
addled afterwards ;-)).

Ian.

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