memory: add ref/unref calls

Add ref/unref calls at the following places:

- places where memory regions are stashed by a listener and
  used outside the BQL (including in Xen or KVM).

- memory_region_find callsites

- creation of aliases and containers (only the aliased/contained
  region gets a reference to avoid loops)

- around calls to del_subregion/add_subregion, where the region
  could disappear after the first call

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/target-arm/kvm.c b/target-arm/kvm.c
index d3937a260f..b92e00dae0 100644
--- a/target-arm/kvm.c
+++ b/target-arm/kvm.c
@@ -233,6 +233,7 @@ static void kvm_arm_machine_init_done(Notifier *notifier, void *data)
                 abort();
             }
         }
+        memory_region_unref(kd->mr);
         g_free(kd);
     }
 }
@@ -258,6 +259,7 @@ void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid)
     kd->kda.id = devid;
     kd->kda.addr = -1;
     QSLIST_INSERT_HEAD(&kvm_devices_head, kd, entries);
+    memory_region_ref(kd->mr);
 }
 
 bool write_kvmstate_to_list(ARMCPU *cpu)