linux-kernel - [PATCH 4.11 38/88] efi: Process the MEMATTR table only if EFI

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Date:   Wed, 19 Jul 2017 12:08:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Daniel Kiper <daniel.kiper@...cle.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        andrew.cooper3@...rix.com, boris.ostrovsky@...cle.com,
        jgross@...e.com, linux-efi@...r.kernel.org,
        matt@...eblueprint.co.uk, xen-devel@...ts.xenproject.org,
        Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 4.11 38/88] efi: Process the MEMATTR table only if EFI_MEMMAP is enabled

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

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

From: Daniel Kiper <daniel.kiper@...cle.com>

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@...cle.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: andrew.cooper3@...rix.com
Cc: boris.ostrovsky@...cle.com
Cc: jgross@...e.com
Cc: linux-efi@...r.kernel.org
Cc: matt@...eblueprint.co.uk
Cc: xen-devel@...ts.xenproject.org
Link: http://lkml.kernel.org/r/1498128697-12943-2-git-send-email-daniel.kiper@oracle.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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) {