On Wed, Aug 10, 2016 at 5:28 AM, Ingo Molnar <mi...@kernel.org> wrote: > > * Andy Lutomirski <l...@kernel.org> wrote: > >> As currently configured, my laptop cannot boot any existing kernel >> because the real mode trampoline can't be reserved. The ranges in >> which it could live are rejected by the kernel: one is EFI boot >> services data and the other is above the EBDA. > > Ok, so I like this series - if Matt acks it I can apply it. > > How urgent is it? The 'laptop does not boot' aspect worries me - how > frequently > are systems hit by this?
As far as I know, I'm the only affected user unless Mario has heard otherwise. I pinged the Fedora kernel maintainers and no one else has reported this issue. I think it needs a fully up-to-date BIOS on a particular laptop with a non-default BIOS setting enabled that runs Fedora (or maybe RHEL or CentOS) -- my best guess is that this is only triggered when using Red Hat / Fedora's patched GRUB, and I have no clue why. I've checked, and the reported EFI memory map is different if I boot using Fedora's GRUB and if I boot exactly the same system off a live USB stick. > > The approach you chose looks sufficiently robust and straightforward to me, > so it > ought to work fine even for x86/urgent - but we can phase it into efi/core as > well > if Matt prefers that. > I like x86/urgent because I like to be able to boot stock kernels :) --Andy
