[RFC PATCH v1 13/26] kvm: vmi: block the object destruction if the chardev is connected

[Adalbert Lazăr]

The introspection tool can modify the VM while it is running
(e.g. it can set breakpoints), and when the VM is no longer introspected
these changes need to be removed. Until then, we block the destruction of
the introspection object that would lead to the unexpected shutdown
of the introspection channel.

Signed-off-by: Adalbert Lazăr <address@hidden>
---
 accel/kvm/vmi.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/accel/kvm/vmi.c b/accel/kvm/vmi.c
index f456ca56ef..2ce8a60565 100644
--- a/accel/kvm/vmi.c
+++ b/accel/kvm/vmi.c
@@ -151,11 +151,19 @@ static bool chardev_is_connected(VMIntrospection *i, 
Error **errp)
     return obj && object_property_get_bool(obj, "connected", errp);
 }
 
+static bool introspection_can_be_deleted(UserCreatable *uc)
+{
+    VMIntrospection *i = VM_INTROSPECTION(uc);
+
+    return !chardev_is_connected(i, NULL);
+}
+
 static void class_init(ObjectClass *oc, void *data)
 {
     UserCreatableClass *uc = USER_CREATABLE_CLASS(oc);
 
     uc->complete = complete;
+    uc->can_be_deleted = introspection_can_be_deleted;
 }
 
 static void instance_init(Object *obj)