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kvm: warn on more invariant breakage

Modifying a non-existent slot is not allowed. Also check that the first loop doesn't move a deleted slot beyond the used part of the mslots array.

Paolo Bonzini committed 11 years ago

Commit dbaff301 parent efbeec71 file · +3 −1Browse files

Unified · Split

virt/kvm/kvm_main.c+3−1
@@ -671,6 +671,7 @@ static void update_memslots(struct kvm_memslots *slots, · 670 unmodified lines
671671
672672 WARN_ON(mslots[i].id != id);
673673 if (!new->npages) {
674+ WARN_ON(!mslots[i].npages);
674675 new->base_gfn = 0;
675676 if (mslots[i].npages)
676677 slots->used_slots--;
@@ -704,7 +705,8 @@ static void update_memslots(struct kvm_memslots *slots, · 27 unmodified lines
704705 slots->id_to_index[mslots[i].id] = i;
705706 i--;
706707 }
707− }
708+ } else
709+ WARN_ON_ONCE(i != slots->used_slots);
708710
709711 mslots[i] = *new;
710712 slots->id_to_index[mslots[i].id] = i;