On Fri, May 23, 2014 at 02:02:10PM -0500, Alex Thorlton wrote: > On Fri, May 23, 2014 at 11:19:30AM -0500, Russ Anderson wrote: > > On Fri, May 23, 2014 at 05:54:11PM +0200, Borislav Petkov wrote: > > > On Fri, May 23, 2014 at 09:47:08AM -0400, Dave Young wrote: > > > > Hi, > > > > > > > > Vivek, replying with webmail, sorry for the formatting issue. > > > > > > > > Another way is export the mapping scheme in sysfs. So if kernel boot > > > > with efi=old_map we can detect it as well. OTOH in future there's probably > > > > other quirk system. > > > > > > > > So kexec-tools can switch to use old way if kernel use ioremap. > > This sounds like a good approach to use, but I think we should still > have a way to force it to use the old way if necessary (can't think of a > use case for that off the top of my head, but I'm sure someone can :) > > I think a sort of hybrid approach between detecting the mapping scheme, > and having a command-line option would probably be best: > > - Detect which mapping method we used. > - Default to noefi if the old mapping method was used, default to > efi if new mapping was used. Agree because the efi=old_map > - Allow users to specify either --efi or --noefi when kexec'ing to > override the suggested default, determined above. I can not think out of such a case, but who knows. I can work on a '--noefi' patch. Thanks Dave
