Revision 7b665b66

b/hw/virtio-pci.c
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    if (!vdev) {
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        return -1;
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    }
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    vdev->nvectors = proxy->nvectors ? proxy->nvectors
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                                     : proxy->max_virtserial_ports + 1;
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    vdev->nvectors = proxy->nvectors == -1 ? proxy->max_virtserial_ports + 1
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                                           : proxy->nvectors;
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    virtio_init_pci(proxy, vdev,
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                    PCI_VENDOR_ID_REDHAT_QUMRANET,
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                    PCI_DEVICE_ID_VIRTIO_CONSOLE,
......
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        .init      = virtio_serial_init_pci,
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        .exit      = virtio_exit_pci,
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        .qdev.props = (Property[]) {
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            DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 0),
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            DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, -1),
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            DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
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            DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
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            DEFINE_PROP_UINT32("max_ports", VirtIOPCIProxy, max_virtserial_ports,

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