[Xen-devel] [PATCH v3 3/3] xen/x86: support larger memory map from EFI

[Juergen Gross <jgross@xxxxxxxx>]

Use a larger e820 map buffer for non-BIOS memory map sources. This
requires to have different defines for the maximum number of E820 map
entries for the raw BIOS buffer and the later used struct e820map.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
V2: - define E820_BIOS_MAX in assembly code only (Jan Beulich)
---
 xen/arch/x86/boot/mem.S    | 6 +++---
 xen/include/asm-x86/e820.h | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/boot/mem.S b/xen/arch/x86/boot/mem.S
index 14dff95..4b1fa4d 100644
--- a/xen/arch/x86/boot/mem.S
+++ b/xen/arch/x86/boot/mem.S
@@ -1,7 +1,7 @@
         .code16
 
 #define SMAP    0x534d4150
-#define E820MAX 128
+#define E820_BIOS_MAX 128
 
 get_memory_map:
 
@@ -23,7 +23,7 @@ get_memory_map:
         jne     .Lmem88
 
         movb    bootsym(e820nr),%al             # up to 128 entries
-        cmpb    $E820MAX,%al
+        cmpb    $E820_BIOS_MAX,%al
         jae     .Lmem88
 
         incb    bootsym(e820nr)
@@ -86,7 +86,7 @@ ENTRY(e820map_copy)
 
         .align  4
 e820map:
-        .fill   E820MAX*20,1,0
+        .fill   E820_BIOS_MAX*20,1,0
 e820nr:
         .long   0
 GLOBAL(lowmem_kb)
diff --git a/xen/include/asm-x86/e820.h b/xen/include/asm-x86/e820.h
index a2d468f..28defa8 100644
--- a/xen/include/asm-x86/e820.h
+++ b/xen/include/asm-x86/e820.h
@@ -16,7 +16,7 @@ struct __packed e820entry {
     uint32_t type;
 };
 
-#define E820MAX        128
+#define E820MAX        1024
 
 struct e820map {
     unsigned int nr_map;
-- 
2.10.2


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