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Internal flag msi_used is uncesessary, msi_uninit() could be called directly, msi_enabled() is enough to check device msi state. But for migration compatibility, keep the field in structure. cc: Paolo Bonzini <pbonzini@redhat.com> cc: Dmitry Fleytman <dmitry@daynix.com> cc: Markus Armbruster <armbru@redhat.com> cc: Marcel Apfelbaum <marcel@redhat.com> cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com>