• Matt Fleming's avatar
    x86/efi: Only map RAM into EFI page tables if in mixed-mode · 12976670
    Matt Fleming authored
    Waiman reported that booting with CONFIG_EFI_MIXED enabled on his
    multi-terabyte HP machine results in boot crashes, because the EFI
    region mapping functions loop forever while trying to map those
    regions describing RAM.
    
    While this patch doesn't fix the underlying hang, there's really no
    reason to map EFI_CONVENTIONAL_MEMORY regions into the EFI page tables
    when mixed-mode is not in use at runtime.
    Reported-by: default avatarWaiman Long <waiman.long@hpe.com>
    Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    CC: Theodore Ts'o <tytso@mit.edu>
    Cc: Arnd Bergmann <arnd@arndb.de>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: Scott J Norton <scott.norton@hpe.com>
    Cc: Douglas Hatch <doug.hatch@hpe.com>
    Cc: <stable@vger.kernel.org> # v4.6+
    Signed-off-by: default avatarMatt Fleming <matt@codeblueprint.co.uk>
    12976670
efi_64.c 17.4 KB