qemu的usb前后端处理

1、qemu命令

-chardev 'spicevmc,id=usbredirchardev0,name=usbredir' \

-device 'usb-redir,chardev=usbredirchardev0,id=usbredirdev0,bus=xhci.0,port=3' \

2、后端

#define SUBTYPE_USBREDIR "usbredir"

static int
spice_server_char_device_add_interface(SpiceServer *reds, SpiceBaseInstance *sin)
{
...
    else if (strcmp(char_device->subtype, SUBTYPE_USBREDIR) == 0) {
        dev_state = spicevmc_device_connect(reds, char_device, SPICE_CHANNEL_USBREDIR);
    }
...
}

3、前端

#define TYPE_USB_REDIR "usb-redir"
#define TYPE_USB_DEVICE "usb-device"

static const TypeInfo usbredir_dev_info = {
    .name          = TYPE_USB_REDIR,
    .parent        = TYPE_USB_DEVICE,
    .instance_size = sizeof(USBRedirDevice),
    .class_init    = usbredir_class_initfn,
    .instance_init = usbredir_instance_init,
};
module_obj(TYPE_USB_REDIR);

static void usbredir_register_types(void)
{
    type_register_static(&usbredir_dev_info);
}