[Xen-changelog] [xen-unstable] Fix live migration w/ shadow2.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Steven Hand <steven@xxxxxxxxxxxxx>
# Node ID 28e3132b9f93b4844d4d8ad8df2984c09069a7cd
# Parent  b3bfff8b1c100016bd658d52fde459f4cf887129
Fix live migration w/ shadow2. 

Signed-off-by: Steven Hand <steven@xxxxxxxxxxxxx>
---
 xen/arch/x86/traps.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff -r b3bfff8b1c10 -r 28e3132b9f93 xen/arch/x86/traps.c
--- a/xen/arch/x86/traps.c      Thu Aug 17 19:24:20 2006 +0100
+++ b/xen/arch/x86/traps.c      Thu Aug 17 20:30:05 2006 +0100
@@ -890,8 +890,9 @@ static int fixup_page_fault(unsigned lon
 
     if ( VM_ASSIST(d, VMASST_TYPE_writable_pagetables) &&
          guest_kernel_mode(v, regs) &&
-         ((regs->error_code & (PGERR_write_access|PGERR_page_present)) ==
-          (PGERR_write_access|PGERR_page_present)) &&
+         /* Do not check if access-protection fault since the page may 
+            legitimately be not present in shadow page tables */
+         ((regs->error_code & PGERR_write_access) == PGERR_write_access) &&
          ptwr_do_page_fault(d, addr, regs) )
         return EXCRET_fault_fixed;
 

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