linux-kernel - Re: [Xen-devel] HVMLite / PVHv2

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Message-ID: <CAFLBxZbiGppNad=Z6-fLgx89O0yAFrSyARTCwv=vHBR3zJ=NsA@mail.gmail.com>
Date:	Wed, 13 Apr 2016 11:05:00 +0100
From:	George Dunlap <george.dunlap@...rix.com>
To:	"Luis R. Rodriguez" <mcgrof@...nel.org>
CC:	Matt Fleming <matt@...eblueprint.co.uk>, <jeffm@...e.com>,
	Michael Chang <MChang@...e.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jim Fehlig <jfehlig@...e.com>, Jan Beulich <JBeulich@...e.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Daniel Kiper <daniel.kiper@...cle.com>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Takashi Iwai <tiwai@...e.de>,
	Vojtěch Pavlík <vojtech@...e.cz>,
	Gary Lin <GLin@...e.com>,
	xen-devel <xen-devel@...ts.xenproject.org>,
	Jeffrey Cheung <JCheung@...e.com>,
	Juergen Gross <jgross@...e.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Julien Grall <julien.grall@...aro.org>, joeyli <jlee@...e.com>,
	Borislav Petkov <bp@...en8.de>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Charles Arndol <carnold@...e.com>,
	"Andrew Cooper" <andrew.cooper3@...rix.com>,
	Julien Grall <julien.grall@....com>,
	Andy Lutomirski <luto@...capital.net>,
	David Vrabel <david.vrabel@...rix.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Roger Pau Monné <roger.pau@...rix.com>
Subject: Re: [Xen-devel] HVMLite / PVHv2 - using x86 EFI boot entry

On Tue, Apr 12, 2016 at 11:12 PM, Luis R. Rodriguez <mcgrof@...nel.org> wrote:
> Also, x86 does have a history of short DT use. Just pointing that its there as
> an option as well. I'll Cc you on some thread about that.

I'm not sure how this is relevant to anything.

What we're talking about is how to get from Xen to a point in the
Linux kernel where everything can Just Work.  The proposed feature is
a mini trampoline that (as I understand it):
1. Tells Xen where to jump to (via ELF note)
2. Sets up some basic modes and pagetables and then jumps to the zero
page so Linux can just carry on.

 -George