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A notifier callback can be used by various subsystems to perform actions when KVM file descriptor for a virtual machine changes as a part of confidential guest reset process. This change adds this notifier mechanism. Subsequent patches will add specific implementations for various notifier callbacks corresponding to various subsystems that need to take action when KVM VM file descriptor changed. Signed-off-by: Ani Sinha <anisinha@redhat.com> Link: https://lore.kernel.org/r/20260225035000.385950-8-anisinha@redhat.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>