[Xen-devel] [PATCH] memop: adjust error checking in populate_physmap()

["Jan Beulich" <JBeulich@xxxxxxxx>]

Checking that multi-page allocations are permitted is unnecessary for
PoD population operations. Instead, the (loop invariant) check added
for addressing XSA-31 can be moved here.

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

--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -99,7 +99,8 @@ static void populate_physmap(struct memo
                                      a->nr_extents-1) )
         return;
 
-    if ( !multipage_allocation_permitted(current->domain, a->extent_order) )
+    if ( a->memflags & MEMF_populate_on_demand ? a->extent_order > MAX_ORDER :
+         !multipage_allocation_permitted(current->domain, a->extent_order) )
         return;
 
     for ( i = a->nr_done; i < a->nr_extents; i++ )
@@ -115,8 +116,7 @@ static void populate_physmap(struct memo
 
         if ( a->memflags & MEMF_populate_on_demand )
         {
-            if ( a->extent_order > MAX_ORDER ||
-                 guest_physmap_mark_populate_on_demand(d, gpfn,
+            if ( guest_physmap_mark_populate_on_demand(d, gpfn,
                                                        a->extent_order) < 0 )
                 goto out;
         }

Attachment: memop-populate-PoD-multipage.patch
Description: Text document

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