# Commit 8e4d495cb8f70280482edae12b48f422b5715099
# Date 2025-12-11 09:50:10 +0100
# Author Roger Pau Monné <roger.pau@citrix.com>
# Committer Jan Beulich <jbeulich@suse.com>
x86/pod: fix decrease_reservation() clearing of M2P entries

Add the missing index increase in the M2P clearing loop, otherwise the loop
keeps pointlessly setting the same MFN entry repeatedly.  This seems to be
an oversight from the change that introduced support to process high order
pages in one go.

Fixes: 3c352011c0d3 ("x86/PoD: shorten certain operations on higher order ranges")
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

--- a/xen/arch/x86/mm/p2m-pod.c
+++ b/xen/arch/x86/mm/p2m-pod.c
@@ -655,7 +655,7 @@ decrease_reservation(struct domain *d, g
             }
             p2m_tlb_flush_sync(p2m);
             for ( j = 0; j < n; ++j )
-                set_gpfn_from_mfn(mfn_x(mfn), INVALID_M2P_ENTRY);
+                set_gpfn_from_mfn(mfn_x(mfn) + j, INVALID_M2P_ENTRY);
             p2m_pod_cache_add(p2m, page, cur_order);
 
             ioreq_request_mapcache_invalidate(d);