From mboxrd@z Thu Jan 1 00:00:00 1970 From: Russ Anderson Subject: Re: [regression, bisected] x86: efi: Pass boot services variable info to runtime code Date: Wed, 29 May 2013 15:16:17 -0500 Message-ID: <20130529201616.GB28027@sgi.com> References: <20130522162747.GA20816@sgi.com> <20130523115801.GJ14575@console-pimps.org> <20130523222321.GB31880@sgi.com> <20130524074544.GM14575@console-pimps.org> Reply-To: Russ Anderson Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20130524074544.GM14575-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Matt Fleming Cc: Matthew Garrett , matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" , Josh Boyer List-Id: linux-efi@vger.kernel.org On Fri, May 24, 2013 at 08:45:44AM +0100, Matt Fleming wrote: > On Thu, 23 May, at 05:23:21PM, Russ Anderson wrote: > > Interesting data point. The failure is on a rhel7/grub2 root. > > The identical kernel on a rhel6/grub root boots. So maybe > > grub2 brings out the failure? I suspect Fedora19/grub2 on > > EFI should hit the problem (for someone looking to reproduce > > it). > > > > In both cases the kernel boot line options are the same. > > I'll bet that rhel7 is using the EFI handover protocol which uses the > internal mechanisms of the EFI boot stub. To be more specific (now that I've dug through the code), grub2 (used by rhel7) uses EFI boot stubs. grub and elilo apparently do not use EFI boot stubs, so they don't hit the problem (at least on my test systems). -- Russ Anderson, OS RAS/Partitioning Project Lead SGI - Silicon Graphics Inc rja-sJ/iWh9BUns@public.gmane.org