[Xen-devel] [PATCH] x86: show pagetable walk if guest cannot handle page fault

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

This turned out to be a useful debugging aid when a guest (especially
dom0) dies early during boot due to a page fault.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

Index: 2006-09-11/xen/arch/x86/traps.c
===================================================================
--- 2006-09-11.orig/xen/arch/x86/traps.c        2006-09-20 15:52:41.000000000 
+0200
+++ 2006-09-11/xen/arch/x86/traps.c     2006-09-20 15:53:06.000000000 +0200
@@ -694,6 +694,8 @@ void propagate_page_fault(unsigned long 
     tb->error_code = error_code;
     tb->cs         = ti->cs;
     tb->eip        = ti->address;
+    if ( !tb->eip )
+        show_page_walk(addr);
     if ( TI_GET_IF(ti) )
         tb->flags |= TBF_INTERRUPT;
 }


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