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

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Message-ID: <1382435127.1657.70.camel@hastur.hellion.org.uk>
Date:	Tue, 22 Oct 2013 10:45:27 +0100
From:	Ian Campbell <ian.campbell@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	<ross.philipson@...rix.com>, <stefano.stabellini@...citrix.com>,
	<grub-devel@....org>, <david.woodhouse@...el.com>,
	<richard.l.maliszewski@...el.com>, <xen-devel@...ts.xen.org>,
	<boris.ostrovsky@...cle.com>,
	Daniel Kiper <daniel.kiper@...cle.com>,
	<konrad.wilk@...cle.com>, Peter Jones <pjones@...hat.com>,
	<linux-kernel@...r.kernel.org>, <keir@....org>
Subject: Re: EFI and multiboot2 devlopment work for Xen

On Tue, 2013-10-22 at 10:31 +0100, Jan Beulich wrote:
> >>> On 22.10.13 at 11:26, Ian Campbell <ian.campbell@...rix.com> wrote:
> > AIUI "efilinux" is somewhat badly named and does not use the Linux Boot
> > Protocol (i.e. the (b)zImage stuff with real mode entry point) either.
> > It actually loads and executes the kernel binary as a PE/COFF executable
> > (the native UEFI binary executable format). xen.efi is a PE/COFF binary
> > too and could equally well be launched by linuxefi in this way.
> 
> Except that unless I'm mistaken "linuxefi" still expects to find certain
> Linux-specific internal data structures inside the PE image, which I
> don't see us wanting to be emulating. That's the main difference to
> "chainloader" afaict.

Ah, I'd been led to believe it was just the lack of a call to
ExitBootServices, but I didn't check. What you say sounds completely
plausible.

Do you know what sort of Linux specific data structures are we talking
about?

Ian.

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