[Xen-devel] [PATCH] xen/arm64: config: correct VMAP_VIRT_END

[Peng Fan <van.freenix@xxxxxxxxx>]

To ARM64, we should use '(VMAP_VIRT_START + GB(1))' as VMAP_VIRT_END,
but not '(VMAP_VIRT_START + GB(1) - 1)'.

Seeing 'vm_end[type] = PFN_DOWN(end - start);' in vm_init_type,
if not correct VMAP_VIRT_END, one page is wasted.

Signed-off-by: Peng Fan <van.freenix@xxxxxxxxx>
Cc: Julien Grall <julien.grall@xxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---

I found X86 use '(VMAP_VIRT_START + GB(64))' and ARM32 use XENHEAP_VIRT_START,
both are aligned address. So, I think ARM64 may also need to use aligned
address. I am not very sure (:

 xen/include/asm-arm/config.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/include/asm-arm/config.h b/xen/include/asm-arm/config.h
index 2d11b62..f92c0a0 100644
--- a/xen/include/asm-arm/config.h
+++ b/xen/include/asm-arm/config.h
@@ -147,7 +147,7 @@
 #define SLOT0_ENTRY_SIZE  SLOT0(1)
 
 #define VMAP_VIRT_START  GB(1)
-#define VMAP_VIRT_END    (VMAP_VIRT_START + GB(1) - 1)
+#define VMAP_VIRT_END    (VMAP_VIRT_START + GB(1))
 
 #define FRAMETABLE_VIRT_START  GB(32)
 #define FRAMETABLE_SIZE        GB(32)
-- 
2.6.2


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