[Xen-changelog] [xen-unstable] [XEN] Recompute shadows of PAE PSE l2es when needed.

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

# HG changeset patch
# User Tim Deegan <tim.deegan@xxxxxxxxxxxxx>
# Node ID 477a0084ff47ac99a8fdd0fdf21dca1cb69e7346
# Parent  792fb641ea7b2a7bdd65ac3c959f92b7528e157a
[XEN] Recompute shadows of PAE PSE l2es when needed.
Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>
---
 xen/arch/x86/mm/shadow/multi.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletion(-)

diff -r 792fb641ea7b -r 477a0084ff47 xen/arch/x86/mm/shadow/multi.c
--- a/xen/arch/x86/mm/shadow/multi.c    Fri Sep 29 11:50:51 2006 +0100
+++ b/xen/arch/x86/mm/shadow/multi.c    Fri Sep 29 11:57:06 2006 +0100
@@ -2180,7 +2180,12 @@ static shadow_l1e_t * shadow_get_and_cre
     /* Get the l2e */
     sl2e = shadow_get_and_create_l2e(v, gw, &sl2mfn, ft);
     if ( sl2e == NULL ) return NULL;
-    if ( shadow_l2e_get_flags(*sl2e) & _PAGE_PRESENT ) 
+    /* Install the sl1 in the l2e if it wasn't there or if we need to
+     * re-do it to fix a PSE dirty bit. */
+    if ( shadow_l2e_get_flags(*sl2e) & _PAGE_PRESENT 
+         && likely(ft != ft_demand_write
+                   || (guest_l2e_get_flags(*gw->l2e) & _PAGE_DIRTY) 
+                   || !(guest_l2e_get_flags(*gw->l2e) & _PAGE_PSE)) )
     {
         *sl1mfn = shadow_l2e_get_mfn(*sl2e);
         ASSERT(valid_mfn(*sl1mfn));

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