Re: Cannot passthrough usb with bus number and device number

["YaoHua Wu" <yaohua.wu@xxxxxxxxx>]

Yes, I checked the libvirt code and found that the strtoul function is used to do the hexadecimal conversion, thank you for your reply :)

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yaohua.wu@xxxxxxxxx

 

From： YaoHua Wu

Date： 2020-12-08 16:14

To： libvirt-users

Subject： Cannot passthrough usb with bus number and device number

Sometimes, qemu cannot find correct usb device number

Reproduce steps:

1、lsusb

Bus 001 Device 011: ID 090c:1000

1、prepare usb device attach xml

<hostdev managed="yes" mode="subsystem" type="usb">

    <source>

        <vendor id="0x090c" />

        <product id="0x1000" />

        <address bus='001' device='011'/>

    </source><address bus="1" port="1" type="usb" />

</hostdev>

2、virsh attach-device vm usb.xml

error: internal error: Did not find USB device 090c:1000 bus:1 device 9

Question:

why the device number returned in qemu's error report is not what I wrote in xml，

what I mean is that if my dev number is really wrong, the returned error should also be the number I wrote，

commonly when using dongle

Look forward to your reply

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yaohua.wu