From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vivek Goyal Subject: Re: [PATCH] export efi.flags to sysfs Date: Wed, 28 May 2014 10:51:40 -0400 Message-ID: <20140528145140.GN14863@redhat.com> References: <20140526083935.GA19682@dhcp-16-198.nay.redhat.com> <20140527030058.GB2372@darkstar.nay.redhat.com> <20140528020935.GB2820@darkstar.nay.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20140528020935.GB2820-4/PLUo9XfK+sDdueE5tM26fLeoKvNuZc@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Dave Young Cc: "Fleming, Matt" , "bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" List-Id: linux-efi@vger.kernel.org On Wed, May 28, 2014 at 10:09:35AM +0800, Dave Young wrote: [..] > > I've only vaguely been following along with the other thread, so please > > summarise everything again in your patch. Particularly, I need answers > > to the following questions, > > > > - Are you trying to fix a kexec/kdump regression? > > Somehow it is a regression. Well, it is a *regression*. Previously kdump would work with SGI UV machines as it used "noefi". Now kexec by default thinks that efi is enabled and 1:1 mappings are in place and that does not work with SGI UV machines. So just providing --noefi is not enough. Somebody needs to automatically figure out that this SGI machine does not contain 1:1 mapping and hence need to fall back to old mode. --noefi is good for override. Thanks Vivek