linux-kernel - [PATCH v7 03/10] arch/x86: Do not access EFI memory map if it is not available

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Date:	Mon, 30 Jun 2014 19:52:57 +0200
From:	Daniel Kiper <daniel.kiper@...cle.com>
To:	linux-efi@...r.kernel.org, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	xen-devel@...ts.xenproject.org
Cc:	andrew.cooper3@...rix.com, boris.ostrovsky@...cle.com,
	david.vrabel@...rix.com, eshelton@...ox.com, fenghua.yu@...el.com,
	hpa@...or.com, ian.campbell@...rix.com, jbeulich@...e.com,
	jeremy@...p.org, konrad.wilk@...cle.com, matt.fleming@...el.com,
	mingo@...hat.com, mjg59@...f.ucam.org,
	stefano.stabellini@...citrix.com, tglx@...utronix.de,
	tony.luck@...el.com
Subject: [PATCH v7 03/10] arch/x86: Do not access EFI memory map if it is not available

Do not access EFI memory map if it is not available. At least
Xen dom0 EFI implementation does not have an access to it.

Signed-off-by: Daniel Kiper <daniel.kiper@...cle.com>
---
v6 - suggestions/fixes:
   - create this separate patch from main EFI_PARAVIRT patch
     (suggested by Matt Fleming).
---
 arch/x86/platform/efi/efi.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 0ee1f46..d2d3c41 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -1220,6 +1220,9 @@ u64 efi_mem_attributes(unsigned long phys_addr)
 	efi_memory_desc_t *md;
 	void *p;
 
+	if (!efi_enabled(EFI_MEMMAP))
+		return 0;
+
 	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 		md = p;
 		if ((md->phys_addr <= phys_addr) &&
-- 
1.7.10.4

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