* Matt Fleming <[email protected]> [2016-01-21 14:11:59]: > The switch to using a new dedicated page table for EFI runtime calls > in commit commit 67a9108ed431 ("x86/efi: Build our own page table > structures") failed to take into account changes required for the > kexec code paths, which are unfortunately duplicated in the EFI code. > > Call the allocation and setup functions in kexec_enter_virtual_mode() > just like we do for __efi_enter_virtual_mode() to avoid hitting > NULL-pointer dereferences when making EFI runtime calls. > > At the very least, the call to efi_setup_page_tables() should have > existed for kexec before commit 67a9108ed431. Things just magically > worked because we were actually using the kernel's page tables that > contained the required mappings. > > Reported-by: Srikar Dronamraju <[email protected]> > Cc: Raghavendra K T <[email protected]> > Cc: Dave Young <[email protected]> > Cc: Ingo Molnar <[email protected]> > Cc: Linus Torvalds <[email protected]> > Cc: Borislav Petkov <[email protected]> > Signed-off-by: Matt Fleming <[email protected]>
Applied this patch on top of tip/x86/efi and was able to build and boot the kernel. -- Thanks and Regards Srikar Dronamraju
