[Xen-changelog] Fix the zombie domain when destroying 2.6 linux vmx guest.

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

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID faf5c318f9b06ba90650436d5842a8009b9ab8fe
# Parent  f8af1ac29ecb9b99176d54e937928db768e7ee37
Fix the zombie domain when destroying 2.6 linux vmx guest.
The zombie domain is caused by unreleased shadow page
because of lack of put_shadow_ref.
When unshadow a L1 page, set l2e to zero and put ref.

Signed-off-by: <xiaofeng.ling@xxxxxxxxx>

diff -r f8af1ac29ecb -r faf5c318f9b0 xen/arch/x86/shadow.c
--- a/xen/arch/x86/shadow.c     Mon Nov 21 22:19:26 2005
+++ b/xen/arch/x86/shadow.c     Tue Nov 22 06:08:57 2005
@@ -1536,12 +1536,13 @@
             perfc_incr_histo(l1_entries_checked, max_shadow - min_shadow + 1, 
PT_UPDATES);
             if ( d->arch.ops->guest_paging_levels >= PAGING_L3 &&
                  unshadow_l1 ) {
-                pgentry_64_t l2e = {0};
+                pgentry_64_t l2e;
 
                 __shadow_get_l2e(entry->v, entry->va, &l2e);
 
                 if ( entry_get_flags(l2e) & _PAGE_PRESENT ) {
-                    entry_remove_flags(l2e, _PAGE_PRESENT);
+                    put_shadow_ref(entry_get_pfn(l2e));
+                    l2e = entry_empty();
                     __shadow_set_l2e(entry->v, entry->va, &l2e);
 
                     if (entry->v == current)
diff -r f8af1ac29ecb -r faf5c318f9b0 xen/arch/x86/shadow32.c
--- a/xen/arch/x86/shadow32.c   Mon Nov 21 22:19:26 2005
+++ b/xen/arch/x86/shadow32.c   Tue Nov 22 06:08:57 2005
@@ -2426,7 +2426,8 @@
 
                 __shadow_get_l2e(entry->v, entry->va, &l2e);
                 if (l2e_get_flags(l2e) & _PAGE_PRESENT) {
-                    l2e_remove_flags(l2e, _PAGE_PRESENT);
+                    put_shadow_ref(l2e_get_pfn(l2e)); 
+                    l2e = l2e_empty();
                     __shadow_set_l2e(entry->v, entry->va, l2e);
 
                     if (entry->v == current)

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog