[Xen-changelog] [xen-3.4-testing] x86: Correctly allocate module-relocation area and bzimage headroom.

["Xen patchbot-3.4-testing" <patchbot-3.4-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1259677520 0
# Node ID 97ab480f7e80a7de75d21ba1764942be473cd0dd
# Parent  751fef67bbe44beebd0b6db4183c852fdd1b68cc
x86: Correctly allocate module-relocation area and bzimage headroom.

Without this patch, loading a bzimage dom0 kernel while also
requesting a dynamically-allocated crashkernel area is broken.

Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
xen-unstable changeset:   20550:aae0afcc05e3
xen-unstable date:        Tue Dec 01 14:19:28 2009 +0000
---
 xen/arch/x86/setup.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff -r 751fef67bbe4 -r 97ab480f7e80 xen/arch/x86/setup.c
--- a/xen/arch/x86/setup.c      Fri Nov 27 08:34:49 2009 +0000
+++ b/xen/arch/x86/setup.c      Tue Dec 01 14:25:20 2009 +0000
@@ -733,11 +733,9 @@ void __init __start_xen(unsigned long mb
              ((e-s) >= (modules_length+modules_headroom)) )
         {
             initial_images_end = e;
-            e = (e - modules_length) & PAGE_MASK;
-            initial_images_start = e;
-            e -= modules_headroom;
-            initial_images_base = e;
-            e += modules_length + modules_headroom;
+            initial_images_start = initial_images_end - modules_length;
+            initial_images_base = initial_images_start - modules_headroom;
+            initial_images_base &= PAGE_MASK;
             for ( j = mbi->mods_count-1; j >= 0; j-- )
             {
                 e -= mod[j].mod_end - mod[j].mod_start;
@@ -745,6 +743,7 @@ void __init __start_xen(unsigned long mb
                 mod[j].mod_end += e - mod[j].mod_start;
                 mod[j].mod_start = e;
             }
+            e = initial_images_base;
         }
 
         if ( !kexec_crash_area.start && (s < e) &&

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