Thanks Dan.
However,  as I checked this command "device_add", I did not found QMP
support it.
I use the command:
{"QMP": {"query-command"}}
In the return list, I did not found the "device_add". The list is as below:
-------------------------------------------------------------
{"return": [{"name": "quit"}, {"name": "eject"}, {"name": "change"},
{"name": "stop"}, {"name": "cont"}, {"name": "system_reset"}, {"name":
"system_powerdown"}, {"name": "memsave"}, {"name": "pmemsave"},
{"name": "migrate"}, {"name": "migrate_cancel"}, {"name": "pci_add"},
{"name": "pci_del"}, {"name": "balloon"}, {"name": "getfd"}, {"name":
"closefd"}, {"name": "block_passwd"}, {"name": "query-version"},
{"name": "query-commands"}, {"name": "query-chardev"}, {"name":
"query-block"}, {"name": "query-blockstats"}, {"name": "query-cpus"},
{"name": "query-hpet"}, {"name": "query-kvm"}, {"name":
"query-status"}, {"name": "query-mice"}, {"name": "query-vnc"},
{"name": "query-name"}, {"name": "query-uuid"}, {"name":
"query-migrate"}, {"name": "query-balloon"}]}
-------------------------------------------------------------

And on the page : http://www.linux-kvm.org/page/MonitorProtocol.  I
notice that :
-------------------------------------------------------------
TODO
High Priority
do_device_add()/do_device_del() conversions (markus)
do_netdev_add()/do_netdev_del() conversions (markus)
do_blockdev_add()/do_blockdev_del() conversions (markus)
Events Grouping (luiz)
Make qmp-shell work again (luiz)
Self-description & High-level protocol documentation
High-level internal documentation
Better QObjects and QMP debug support
-------------------------------------------------------------

Cause the do_device_add is in the to_do list, does this mean it is not
finished yet?

BTW: my qemu version is 0.12.3 which I believe is the latest version.
My linux kernel is 2.6.33

Good Luck!

On Fri, Apr 16, 2010 at 9:28 PM, Daniel P. Berrange <berrange@redhat.com> wrote:
quoted text
> On Fri, Apr 16, 2010 at 09:18:12PM +0800, chunhui zhao wrote:
>> Hi guys.
>>
>>     As the kvm does not support auto connection of USB device, unless
>> someone inputs the command "usb_add" in the monitor.  I wonder if
>> there is a better way, say, like some linux, auto mount the USB device
>> without any command input. And I know there is also qmp(qemu monitor
>> protocol) to use to communicate with the monitor. So I wanna write a
>> program which will capture the hotplug signal and communicate with the
>> monitor to auto mount the USB device.
>>
>> The problem is, the qmp does not support the command "usb_add".
>> (http://www.linux-kvm.org/page/MonitorProtocol)
>> Is there any method to solve this?
>
> usb_add/del & pci_add/del are all deprecated and not going to be ported
> to QMP. Instead use the device_add command eg in plain monitor format:
>
>  device_add usb-host,hostbus=BUS,hostaddr=ADDR,vendorid=VID,productid=PRID
>
> Or QMP format
>
>    { "execute": "device_add", "arguments": { "driver": "usb-host",
>                                              "hostbus": "BUS",
>                                              "hostaddr": "ADDR",
>                                              "vendorid": "VID",
>                                              "productid": "PRID" }}
>
> This accepts identical param names as the -device command line arg which is
> documented in docs/qdev-device-use.txt
>
> Regards,
> Daniel
> --
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