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-rw-r--r--virt/kvm/kvm_main.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 28eb160..fca6487 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -782,14 +782,16 @@ int __kvm_set_memory_region(struct kvm *kvm,
if (!npages && !old.npages)
goto out;
- /* Check for overlaps */
- r = -EEXIST;
- kvm_for_each_memslot(slot, kvm->memslots) {
- if (slot->id >= KVM_USER_MEM_SLOTS || slot == memslot)
- continue;
- if (!((base_gfn + npages <= slot->base_gfn) ||
- (base_gfn >= slot->base_gfn + slot->npages)))
- goto out;
+ if ((npages && !old.npages) || (base_gfn != old.base_gfn)) {
+ /* Check for overlaps */
+ r = -EEXIST;
+ kvm_for_each_memslot(slot, kvm->memslots) {
+ if (slot->id >= KVM_USER_MEM_SLOTS || slot == memslot)
+ continue;
+ if (!((base_gfn + npages <= slot->base_gfn) ||
+ (base_gfn >= slot->base_gfn + slot->npages)))
+ goto out;
+ }
}
/* Free page dirty bitmap if unneeded */
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