Ok, I've cloned the ubuntu-trusty repo, used git bisect and found the culprit:
dc9c3ed611922e769b1fd595f8f99a93d69c026d is the first bad commit commit dc9c3ed611922e769b1fd595f8f99a93d69c026d Author: Borislav Petkov <[email protected]> Date: Thu Oct 31 17:25:08 2013 +0100 x86/efi: Runtime services virtual mapping BugLink: http://bugs.launchpad.net/bugs/1297658 We map the EFI regions needed for runtime services non-contiguously, with preserved alignment on virtual addresses starting from -4G down for a total max space of 64G. This way, we provide for stable runtime services addresses across kernels so that a kexec'd kernel can still use them. Thus, they're mapped in a separate pagetable so that we don't pollute the kernel namespace. Add an efi= kernel command line parameter for passing miscellaneous options and chicken bits from the command line. While at it, add a chicken bit called "efi=old_map" which can be used as a fallback to the old runtime services mapping method in case there's some b0rkage with a particular EFI implementation (haha, it is hard to hold up the sarcasm here...). Also, add the UEFI RT VA space to Documentation/x86/x86_64/mm.txt. Signed-off-by: Borislav Petkov <[email protected]> Signed-off-by: Matt Fleming <[email protected]> (cherry picked from commit d2f7cbe7b26a74dbbbf8f325b2a6fd01bc34032c) Signed-off-by: Tim Gardner <[email protected]> :040000 040000 52f7a3e427111f66f65fcb67b1d010cee7e5121f 1200735ebee4c3272d1e3eedfc00c7150d17e276 M Documentation :040000 040000 21376a74b6a2dc5dbe5b581677830b90bec72e49 95678fbb2d7178afb7866daf706dd7706d8da7e6 M arch :040000 040000 bf1515bb7d32745424abf75d8ce58340f482e88c 59013df8e2ea1c112d96b982105b469917864c8f M include -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1301590 Title: System does not boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301590/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
