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

Daniel Kiper
2014-06-30T17:52:57Z

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@oracle.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