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

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Message-ID: <20131022153258.GA12260@srcf.ucam.org>
Date:	Tue, 22 Oct 2013 16:32:58 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	"Woodhouse, David" <david.woodhouse@...el.com>
Cc:	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>,
	Daniel Kiper <daniel.kiper@...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 03:25:39PM +0000, Woodhouse, David wrote:

> Oh, ignore that. You want the *actual* PE executable entry point, as it
> would get invoked by a real UEFI firmware.

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.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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