On 11/09/2016 08:49 PM, Jike Song wrote:
+void vfio_group_attach_kvm(struct vfio_group *group, struct kvm *kvm,
+ void (*fn)(struct kvm *))
+{
+ mutex_lock(&group->udata.lock);
This lock is needed, please see below.
+
+ fn(kvm);
+ blocking_notifier_call_chain(&group->udata.notifier,
+ VFIO_GROUP_NOTIFY_ATTACH_KVM, kvm);
As this is a callback before KVM releases its last refcount, i do not
think vendor driver need to get additional KVM refcount.
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