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QEMU currently crashes when the user tries to use the "vmmouse" on a machine without vmport, e.g.: $ x86_64-softmmu/qemu-system-x86_64 -machine microvm -device vmmouse Segmentation fault (core dumped) or: $ x86_64-softmmu/qemu-system-x86_64 -device vmmouse -M pc,vmport=off Segmentation fault (core dumped) Let's avoid the crash by checking for the vmport device first. Signed-off-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Darren Kenny <darren.kenny@oracle.com> Message-Id: <20200129112954.4282-1-thuth@redhat.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>