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x86/efi: Only map RAM into EFI page tables if in mixed-mode 

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: Waiman 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: Matt Fleming <matt@codeblueprint.co.uk>
This commit is contained in:
Matt Fleming 2016-09-19 13:09:09 +01:00
parent e535ec0899
commit 1297667083
1 changed files with 1 additions and 1 deletions
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2
arch/x86/platform/efi/efi_64.c
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@ -245,7 +245,7 @@ int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
* text and allocate a new stack because we can't rely on the
* stack pointer being < 4GB.
*/
if (!IS_ENABLED(CONFIG_EFI_MIXED))
if (!IS_ENABLED(CONFIG_EFI_MIXED) || efi_is_native())
return 0;
/*