[Xen-changelog] [xen-unstable] PoD: Don't reclaim xenheap pages in zero-sweep

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

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1253002158 -3600
# Node ID a06db28876fead8f25bd1edda7ff34ee2dd12877
# Parent  3deb2bd7aade3aa65904a4f5cd8f405de7a1231b
PoD: Don't reclaim xenheap pages in zero-sweep

Don't reclaim xenheap-allocated pages in the zero-sweep.  This avoids
grabbing things like grant tables mapped in the p2m.

Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
---
 xen/arch/x86/mm/p2m.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff -r 3deb2bd7aade -r a06db28876fe xen/arch/x86/mm/p2m.c
--- a/xen/arch/x86/mm/p2m.c     Tue Sep 15 09:08:36 2009 +0100
+++ b/xen/arch/x86/mm/p2m.c     Tue Sep 15 09:09:18 2009 +0100
@@ -759,7 +759,7 @@ p2m_pod_zero_check_superpage(struct doma
          * + All gfns are ram types
          * + All gfns have the same type
          * + All of the mfns are allocated to a domain
-         * + None of the mfns are used as pagetables
+         * + None of the mfns are used as pagetables, or allocated via xenheap
          * + The first mfn is 2-meg aligned
          * + All the other mfns are in sequence
          * Adding for good measure:
@@ -769,7 +769,8 @@ p2m_pod_zero_check_superpage(struct doma
         if ( !p2m_is_ram(type)
              || type != type0
              || ( (mfn_to_page(mfn)->count_info & PGC_allocated) == 0 )
-             || ( (mfn_to_page(mfn)->count_info & PGC_page_table) != 0 )
+             || ( (mfn_to_page(mfn)->count_info & 
(PGC_page_table|PGC_xen_heap)) != 0 )
+             || ( (mfn_to_page(mfn)->count_info & PGC_xen_heap  ) != 0 )
              || ( (mfn_to_page(mfn)->count_info & PGC_count_mask) > max_ref )
              || !( ( i == 0 && superpage_aligned(mfn_x(mfn0)) )
                    || ( i != 0 && mfn_x(mfn) == (mfn_x(mfn0) + i) ) ) )
@@ -860,11 +861,11 @@ p2m_pod_zero_check(struct domain *d, uns
     for ( i=0; i<count; i++ )
     {
         mfns[i] = gfn_to_mfn_query(d, gfns[i], types + i);
-        /* If this is ram, and not a pagetable, and probably not mapped
+        /* If this is ram, and not a pagetable or from the xen heap, and 
probably not mapped
            elsewhere, map it; otherwise, skip. */
         if ( p2m_is_ram(types[i])
              && ( (mfn_to_page(mfns[i])->count_info & PGC_allocated) != 0 ) 
-             && ( (mfn_to_page(mfns[i])->count_info & PGC_page_table) == 0 ) 
+             && ( (mfn_to_page(mfns[i])->count_info & 
(PGC_page_table|PGC_xen_heap)) == 0 ) 
              && ( (mfn_to_page(mfns[i])->count_info & PGC_count_mask) <= 
max_ref ) )
             map[i] = map_domain_page(mfn_x(mfns[i]));
         else

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