[Xen-devel] [PATCH 4.12 27/84] efi: Process the MEMATTR table only if EFI_MEMMAP is enabled

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

4.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Kiper <daniel.kiper@xxxxxxxxxx>

commit 457ea3f7e97881f937136ce0ba1f29f82b9abdb0 upstream.

Otherwise e.g. Xen dom0 on x86_64 EFI platforms crashes.

In theory we can check EFI_PARAVIRT too, however,
EFI_MEMMAP looks more targeted and covers more cases.

Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: andrew.cooper3@xxxxxxxxxx
Cc: boris.ostrovsky@xxxxxxxxxx
Cc: jgross@xxxxxxxx
Cc: linux-efi@xxxxxxxxxxxxxxx
Cc: matt@xxxxxxxxxxxxxxxxxxx
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
Link: 
http://lkml.kernel.org/r/1498128697-12943-2-git-send-email-daniel.kiper@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/firmware/efi/efi.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -528,7 +528,8 @@ int __init efi_config_parse_tables(void
                }
        }
 
-       efi_memattr_init();
+       if (efi_enabled(EFI_MEMMAP))
+               efi_memattr_init();
 
        /* Parse the EFI Properties table if it exists */
        if (efi.properties_table != EFI_INVALID_TABLE_ADDR) {



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