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[skovalev <valor@xxxxxxx>]

Public bug reported:

Allocation of 2GB (in EFI application) as EfiRuntimeServiceData ubuntu 14.04 beta 2 (but have been noticed in previous versions too) makes the kernel hang. No early printks could be seen.
Most suspicious call chain is:

efi_enter_virtual_mode() -> efi_map_region() -> __map_region() ->
kernel_map_pages_in_pgd() -> __change_page_attr_set_clr () ->
__change_page_attr() -> __cpa_process_fault().

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1302719

Title:
  Allocation 2GB of EfiRuntimeServiceData breaks kernel boot

Status in “linux” package in Ubuntu:
  New

Bug description:
  Allocation of 2GB (in EFI application) as EfiRuntimeServiceData ubuntu 14.04 beta 2 (but have been noticed in previous versions too) makes the kernel hang. No early printks could be seen.
  Most suspicious call chain is:

  efi_enter_virtual_mode() -> efi_map_region() -> __map_region() ->
  kernel_map_pages_in_pgd() -> __change_page_attr_set_clr () ->
  __change_page_attr() -> __cpa_process_fault().

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